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fs/btrfs/extent_io.c
140 KB
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#include <linux/bitops.h> #include <linux/slab.h> #include <linux/bio.h> #include <linux/mm.h> |
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#include <linux/pagemap.h> #include <linux/page-flags.h> |
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#include <linux/spinlock.h> #include <linux/blkdev.h> #include <linux/swap.h> |
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#include <linux/writeback.h> #include <linux/pagevec.h> |
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#include <linux/prefetch.h> |
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#include <linux/cleancache.h> |
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#include "extent_io.h" #include "extent_map.h" |
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#include "ctree.h" #include "btrfs_inode.h" |
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#include "volumes.h" |
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#include "check-integrity.h" |
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#include "locking.h" |
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#include "rcu-string.h" |
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#include "backref.h" |
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|
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static struct kmem_cache *extent_state_cache; static struct kmem_cache *extent_buffer_cache; |
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static struct bio_set *btrfs_bioset; |
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|
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static inline bool extent_state_in_tree(const struct extent_state *state) { return !RB_EMPTY_NODE(&state->rb_node); } |
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#ifdef CONFIG_BTRFS_DEBUG |
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static LIST_HEAD(buffers); static LIST_HEAD(states); |
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|
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static DEFINE_SPINLOCK(leak_lock); |
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static inline void btrfs_leak_debug_add(struct list_head *new, struct list_head *head) { unsigned long flags; spin_lock_irqsave(&leak_lock, flags); list_add(new, head); spin_unlock_irqrestore(&leak_lock, flags); } static inline void btrfs_leak_debug_del(struct list_head *entry) { unsigned long flags; spin_lock_irqsave(&leak_lock, flags); list_del(entry); spin_unlock_irqrestore(&leak_lock, flags); } static inline void btrfs_leak_debug_check(void) { struct extent_state *state; struct extent_buffer *eb; while (!list_empty(&states)) { state = list_entry(states.next, struct extent_state, leak_list); |
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pr_err("BTRFS: state leak: start %llu end %llu state %lu in tree %d refs %d ", state->start, state->end, state->state, extent_state_in_tree(state), |
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atomic_read(&state->refs)); |
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list_del(&state->leak_list); kmem_cache_free(extent_state_cache, state); } while (!list_empty(&buffers)) { eb = list_entry(buffers.next, struct extent_buffer, leak_list); |
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printk(KERN_ERR "BTRFS: buffer leak start %llu len %lu " |
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"refs %d ", eb->start, eb->len, atomic_read(&eb->refs)); |
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list_del(&eb->leak_list); kmem_cache_free(extent_buffer_cache, eb); } } |
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|
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#define btrfs_debug_check_extent_io_range(tree, start, end) \ __btrfs_debug_check_extent_io_range(__func__, (tree), (start), (end)) |
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static inline void __btrfs_debug_check_extent_io_range(const char *caller, |
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struct extent_io_tree *tree, u64 start, u64 end) |
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{ |
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struct inode *inode; u64 isize; |
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|
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if (!tree->mapping) return; |
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|
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inode = tree->mapping->host; isize = i_size_read(inode); |
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if (end >= PAGE_SIZE && (end % 2) == 0 && end != isize - 1) { printk_ratelimited(KERN_DEBUG |
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"BTRFS: %s: ino %llu isize %llu odd range [%llu,%llu] ", |
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caller, btrfs_ino(inode), isize, start, end); |
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} } |
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#else #define btrfs_leak_debug_add(new, head) do {} while (0) #define btrfs_leak_debug_del(entry) do {} while (0) #define btrfs_leak_debug_check() do {} while (0) |
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#define btrfs_debug_check_extent_io_range(c, s, e) do {} while (0) |
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#endif |
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|
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#define BUFFER_LRU_MAX 64 struct tree_entry { u64 start; u64 end; |
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struct rb_node rb_node; }; struct extent_page_data { struct bio *bio; struct extent_io_tree *tree; get_extent_t *get_extent; |
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unsigned long bio_flags; |
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/* tells writepage not to lock the state bits for this range * it still does the unlocking */ |
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unsigned int extent_locked:1; /* tells the submit_bio code to use a WRITE_SYNC */ unsigned int sync_io:1; |
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}; |
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static noinline void flush_write_bio(void *data); |
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static inline struct btrfs_fs_info * tree_fs_info(struct extent_io_tree *tree) { |
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if (!tree->mapping) return NULL; |
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return btrfs_sb(tree->mapping->host->i_sb); } |
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|
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int __init extent_io_init(void) { |
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extent_state_cache = kmem_cache_create("btrfs_extent_state", |
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sizeof(struct extent_state), 0, SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); |
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if (!extent_state_cache) return -ENOMEM; |
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extent_buffer_cache = kmem_cache_create("btrfs_extent_buffer", |
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sizeof(struct extent_buffer), 0, SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, NULL); |
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if (!extent_buffer_cache) goto free_state_cache; |
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btrfs_bioset = bioset_create(BIO_POOL_SIZE, offsetof(struct btrfs_io_bio, bio)); if (!btrfs_bioset) goto free_buffer_cache; |
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if (bioset_integrity_create(btrfs_bioset, BIO_POOL_SIZE)) goto free_bioset; |
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return 0; |
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free_bioset: bioset_free(btrfs_bioset); btrfs_bioset = NULL; |
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free_buffer_cache: kmem_cache_destroy(extent_buffer_cache); extent_buffer_cache = NULL; |
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free_state_cache: kmem_cache_destroy(extent_state_cache); |
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extent_state_cache = NULL; |
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return -ENOMEM; } void extent_io_exit(void) { |
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btrfs_leak_debug_check(); |
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/* * Make sure all delayed rcu free are flushed before we * destroy caches. */ rcu_barrier(); |
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if (extent_state_cache) kmem_cache_destroy(extent_state_cache); if (extent_buffer_cache) kmem_cache_destroy(extent_buffer_cache); |
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if (btrfs_bioset) bioset_free(btrfs_bioset); |
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} void extent_io_tree_init(struct extent_io_tree *tree, |
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struct address_space *mapping) |
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{ |
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tree->state = RB_ROOT; |
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tree->ops = NULL; tree->dirty_bytes = 0; |
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spin_lock_init(&tree->lock); |
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tree->mapping = mapping; |
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} |
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|
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static struct extent_state *alloc_extent_state(gfp_t mask) |
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{ struct extent_state *state; |
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state = kmem_cache_alloc(extent_state_cache, mask); |
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if (!state) |
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return state; state->state = 0; |
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state->private = 0; |
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RB_CLEAR_NODE(&state->rb_node); |
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btrfs_leak_debug_add(&state->leak_list, &states); |
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atomic_set(&state->refs, 1); init_waitqueue_head(&state->wq); |
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trace_alloc_extent_state(state, mask, _RET_IP_); |
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return state; } |
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|
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void free_extent_state(struct extent_state *state) |
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{ |
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if (!state) return; if (atomic_dec_and_test(&state->refs)) { |
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WARN_ON(extent_state_in_tree(state)); |
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btrfs_leak_debug_del(&state->leak_list); |
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trace_free_extent_state(state, _RET_IP_); |
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kmem_cache_free(extent_state_cache, state); } } |
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|
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static struct rb_node *tree_insert(struct rb_root *root, struct rb_node *search_start, u64 offset, |
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struct rb_node *node, struct rb_node ***p_in, struct rb_node **parent_in) |
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{ |
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struct rb_node **p; |
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struct rb_node *parent = NULL; |
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struct tree_entry *entry; |
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if (p_in && parent_in) { p = *p_in; parent = *parent_in; goto do_insert; } |
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p = search_start ? &search_start : &root->rb_node; |
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while (*p) { |
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parent = *p; entry = rb_entry(parent, struct tree_entry, rb_node); if (offset < entry->start) p = &(*p)->rb_left; else if (offset > entry->end) p = &(*p)->rb_right; else return parent; } |
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do_insert: |
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rb_link_node(node, parent, p); rb_insert_color(node, root); return NULL; } |
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static struct rb_node *__etree_search(struct extent_io_tree *tree, u64 offset, |
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struct rb_node **prev_ret, struct rb_node **next_ret, struct rb_node ***p_ret, struct rb_node **parent_ret) |
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{ |
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struct rb_root *root = &tree->state; |
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struct rb_node **n = &root->rb_node; |
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struct rb_node *prev = NULL; struct rb_node *orig_prev = NULL; struct tree_entry *entry; struct tree_entry *prev_entry = NULL; |
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while (*n) { prev = *n; entry = rb_entry(prev, struct tree_entry, rb_node); |
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prev_entry = entry; if (offset < entry->start) |
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n = &(*n)->rb_left; |
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else if (offset > entry->end) |
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n = &(*n)->rb_right; |
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else |
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return *n; |
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} |
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if (p_ret) *p_ret = n; if (parent_ret) *parent_ret = prev; |
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if (prev_ret) { orig_prev = prev; |
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while (prev && offset > prev_entry->end) { |
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prev = rb_next(prev); prev_entry = rb_entry(prev, struct tree_entry, rb_node); } *prev_ret = prev; prev = orig_prev; } if (next_ret) { prev_entry = rb_entry(prev, struct tree_entry, rb_node); |
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while (prev && offset < prev_entry->start) { |
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prev = rb_prev(prev); prev_entry = rb_entry(prev, struct tree_entry, rb_node); } *next_ret = prev; } return NULL; } |
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static inline struct rb_node * tree_search_for_insert(struct extent_io_tree *tree, u64 offset, struct rb_node ***p_ret, struct rb_node **parent_ret) |
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{ |
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struct rb_node *prev = NULL; |
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struct rb_node *ret; |
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|
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ret = __etree_search(tree, offset, &prev, NULL, p_ret, parent_ret); |
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if (!ret) |
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return prev; return ret; } |
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static inline struct rb_node *tree_search(struct extent_io_tree *tree, u64 offset) { return tree_search_for_insert(tree, offset, NULL, NULL); } |
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static void merge_cb(struct extent_io_tree *tree, struct extent_state *new, struct extent_state *other) { if (tree->ops && tree->ops->merge_extent_hook) tree->ops->merge_extent_hook(tree->mapping->host, new, other); } |
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/* * utility function to look for merge candidates inside a given range. * Any extents with matching state are merged together into a single * extent in the tree. Extents with EXTENT_IO in their state field * are not merged because the end_io handlers need to be able to do * operations on them without sleeping (or doing allocations/splits). * * This should be called with the tree lock held. */ |
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static void merge_state(struct extent_io_tree *tree, struct extent_state *state) |
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{ struct extent_state *other; struct rb_node *other_node; |
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if (state->state & (EXTENT_IOBITS | EXTENT_BOUNDARY)) |
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return; |
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other_node = rb_prev(&state->rb_node); if (other_node) { other = rb_entry(other_node, struct extent_state, rb_node); if (other->end == state->start - 1 && other->state == state->state) { |
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merge_cb(tree, state, other); |
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state->start = other->start; |
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rb_erase(&other->rb_node, &tree->state); |
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RB_CLEAR_NODE(&other->rb_node); |
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free_extent_state(other); } } other_node = rb_next(&state->rb_node); if (other_node) { other = rb_entry(other_node, struct extent_state, rb_node); if (other->start == state->end + 1 && other->state == state->state) { |
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merge_cb(tree, state, other); |
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state->end = other->end; |
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rb_erase(&other->rb_node, &tree->state); |
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RB_CLEAR_NODE(&other->rb_node); |
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free_extent_state(other); |
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} } |
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} |
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static void set_state_cb(struct extent_io_tree *tree, |
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struct extent_state *state, unsigned long *bits) |
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{ |
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if (tree->ops && tree->ops->set_bit_hook) tree->ops->set_bit_hook(tree->mapping->host, state, bits); |
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} static void clear_state_cb(struct extent_io_tree *tree, |
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struct extent_state *state, unsigned long *bits) |
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{ |
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if (tree->ops && tree->ops->clear_bit_hook) tree->ops->clear_bit_hook(tree->mapping->host, state, bits); |
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} |
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static void set_state_bits(struct extent_io_tree *tree, |
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struct extent_state *state, unsigned long *bits); |
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|
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/* * insert an extent_state struct into the tree. 'bits' are set on the * struct before it is inserted. * * This may return -EEXIST if the extent is already there, in which case the * state struct is freed. * * The tree lock is not taken internally. This is a utility function and * probably isn't what you want to call (see set/clear_extent_bit). */ static int insert_state(struct extent_io_tree *tree, struct extent_state *state, u64 start, u64 end, |
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struct rb_node ***p, struct rb_node **parent, |
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unsigned long *bits) |
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{ struct rb_node *node; |
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if (end < start) |
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WARN(1, KERN_ERR "BTRFS: end < start %llu %llu ", |
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end, start); |
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state->start = start; state->end = end; |
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|
3150b6996 Btrfs: clean up f... |
421 |
set_state_bits(tree, state, bits); |
f2071b215 Btrfs: more effic... |
422 |
node = tree_insert(&tree->state, NULL, end, &state->rb_node, p, parent); |
d1310b2e0 Btrfs: Split the ... |
423 424 425 |
if (node) { struct extent_state *found; found = rb_entry(node, struct extent_state, rb_node); |
efe120a06 Btrfs: convert pr... |
426 |
printk(KERN_ERR "BTRFS: found node %llu %llu on insert of " |
c1c9ff7c9 Btrfs: Remove sup... |
427 428 429 |
"%llu %llu ", found->start, found->end, start, end); |
d1310b2e0 Btrfs: Split the ... |
430 431 432 433 434 |
return -EEXIST; } merge_state(tree, state); return 0; } |
1bf85046e btrfs: Make exten... |
435 |
static void split_cb(struct extent_io_tree *tree, struct extent_state *orig, |
9ed74f2db Btrfs: proper -EN... |
436 437 438 |
u64 split) { if (tree->ops && tree->ops->split_extent_hook) |
1bf85046e btrfs: Make exten... |
439 |
tree->ops->split_extent_hook(tree->mapping->host, orig, split); |
9ed74f2db Btrfs: proper -EN... |
440 |
} |
d1310b2e0 Btrfs: Split the ... |
441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 |
/* * split a given extent state struct in two, inserting the preallocated * struct 'prealloc' as the newly created second half. 'split' indicates an * offset inside 'orig' where it should be split. * * Before calling, * the tree has 'orig' at [orig->start, orig->end]. After calling, there * are two extent state structs in the tree: * prealloc: [orig->start, split - 1] * orig: [ split, orig->end ] * * The tree locks are not taken by this function. They need to be held * by the caller. */ static int split_state(struct extent_io_tree *tree, struct extent_state *orig, struct extent_state *prealloc, u64 split) { struct rb_node *node; |
9ed74f2db Btrfs: proper -EN... |
459 460 |
split_cb(tree, orig, split); |
d1310b2e0 Btrfs: Split the ... |
461 462 463 464 |
prealloc->start = orig->start; prealloc->end = split - 1; prealloc->state = orig->state; orig->start = split; |
f2071b215 Btrfs: more effic... |
465 466 |
node = tree_insert(&tree->state, &orig->rb_node, prealloc->end, &prealloc->rb_node, NULL, NULL); |
d1310b2e0 Btrfs: Split the ... |
467 |
if (node) { |
d1310b2e0 Btrfs: Split the ... |
468 469 470 471 472 |
free_extent_state(prealloc); return -EEXIST; } return 0; } |
cdc6a3952 Btrfs: avoid poss... |
473 474 475 476 477 478 479 480 |
static struct extent_state *next_state(struct extent_state *state) { struct rb_node *next = rb_next(&state->rb_node); if (next) return rb_entry(next, struct extent_state, rb_node); else return NULL; } |
d1310b2e0 Btrfs: Split the ... |
481 482 |
/* * utility function to clear some bits in an extent state struct. |
1b303fc05 Btrfs: cleanup th... |
483 |
* it will optionally wake up any one waiting on this state (wake == 1). |
d1310b2e0 Btrfs: Split the ... |
484 485 486 487 |
* * If no bits are set on the state struct after clearing things, the * struct is freed and removed from the tree */ |
cdc6a3952 Btrfs: avoid poss... |
488 489 |
static struct extent_state *clear_state_bit(struct extent_io_tree *tree, struct extent_state *state, |
410748882 btrfs: use unsign... |
490 |
unsigned long *bits, int wake) |
d1310b2e0 Btrfs: Split the ... |
491 |
{ |
cdc6a3952 Btrfs: avoid poss... |
492 |
struct extent_state *next; |
410748882 btrfs: use unsign... |
493 |
unsigned long bits_to_clear = *bits & ~EXTENT_CTLBITS; |
d1310b2e0 Btrfs: Split the ... |
494 |
|
0ca1f7ceb Btrfs: Update met... |
495 |
if ((bits_to_clear & EXTENT_DIRTY) && (state->state & EXTENT_DIRTY)) { |
d1310b2e0 Btrfs: Split the ... |
496 497 498 499 |
u64 range = state->end - state->start + 1; WARN_ON(range > tree->dirty_bytes); tree->dirty_bytes -= range; } |
291d673e6 Btrfs: Do delallo... |
500 |
clear_state_cb(tree, state, bits); |
32c00aff7 Btrfs: release de... |
501 |
state->state &= ~bits_to_clear; |
d1310b2e0 Btrfs: Split the ... |
502 503 |
if (wake) wake_up(&state->wq); |
0ca1f7ceb Btrfs: Update met... |
504 |
if (state->state == 0) { |
cdc6a3952 Btrfs: avoid poss... |
505 |
next = next_state(state); |
27a3507de Btrfs: reduce siz... |
506 |
if (extent_state_in_tree(state)) { |
d1310b2e0 Btrfs: Split the ... |
507 |
rb_erase(&state->rb_node, &tree->state); |
27a3507de Btrfs: reduce siz... |
508 |
RB_CLEAR_NODE(&state->rb_node); |
d1310b2e0 Btrfs: Split the ... |
509 510 511 512 513 514 |
free_extent_state(state); } else { WARN_ON(1); } } else { merge_state(tree, state); |
cdc6a3952 Btrfs: avoid poss... |
515 |
next = next_state(state); |
d1310b2e0 Btrfs: Split the ... |
516 |
} |
cdc6a3952 Btrfs: avoid poss... |
517 |
return next; |
d1310b2e0 Btrfs: Split the ... |
518 |
} |
8233767a2 Btrfs: allocate e... |
519 520 521 522 523 524 525 526 |
static struct extent_state * alloc_extent_state_atomic(struct extent_state *prealloc) { if (!prealloc) prealloc = alloc_extent_state(GFP_ATOMIC); return prealloc; } |
48a3b6366 btrfs: make stati... |
527 |
static void extent_io_tree_panic(struct extent_io_tree *tree, int err) |
c2d904e08 btrfs: Catch lock... |
528 529 530 531 532 |
{ btrfs_panic(tree_fs_info(tree), err, "Locking error: " "Extent tree was modified by another " "thread while locked."); } |
d1310b2e0 Btrfs: Split the ... |
533 534 535 536 537 538 539 540 541 542 |
/* * clear some bits on a range in the tree. This may require splitting * or inserting elements in the tree, so the gfp mask is used to * indicate which allocations or sleeping are allowed. * * pass 'wake' == 1 to kick any sleepers, and 'delete' == 1 to remove * the given range from the tree regardless of state (ie for truncate). * * the range [start, end] is inclusive. * |
6763af84a btrfs: Remove set... |
543 |
* This takes the tree lock, and returns 0 on success and < 0 on error. |
d1310b2e0 Btrfs: Split the ... |
544 545 |
*/ int clear_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, |
410748882 btrfs: use unsign... |
546 |
unsigned long bits, int wake, int delete, |
2c64c53d8 Btrfs: cache valu... |
547 548 |
struct extent_state **cached_state, gfp_t mask) |
d1310b2e0 Btrfs: Split the ... |
549 550 |
{ struct extent_state *state; |
2c64c53d8 Btrfs: cache valu... |
551 |
struct extent_state *cached; |
d1310b2e0 Btrfs: Split the ... |
552 553 |
struct extent_state *prealloc = NULL; struct rb_node *node; |
5c939df56 btrfs: Fix set/cl... |
554 |
u64 last_end; |
d1310b2e0 Btrfs: Split the ... |
555 |
int err; |
2ac55d41b Btrfs: cache the ... |
556 |
int clear = 0; |
d1310b2e0 Btrfs: Split the ... |
557 |
|
a5dee37d3 Btrfs: deal with ... |
558 |
btrfs_debug_check_extent_io_range(tree, start, end); |
8d599ae1b btrfs: add debug ... |
559 |
|
7ee9e4405 Btrfs: check if w... |
560 561 |
if (bits & EXTENT_DELALLOC) bits |= EXTENT_NORESERVE; |
0ca1f7ceb Btrfs: Update met... |
562 563 564 |
if (delete) bits |= ~EXTENT_CTLBITS; bits |= EXTENT_FIRST_DELALLOC; |
2ac55d41b Btrfs: cache the ... |
565 566 |
if (bits & (EXTENT_IOBITS | EXTENT_BOUNDARY)) clear = 1; |
d1310b2e0 Btrfs: Split the ... |
567 568 |
again: if (!prealloc && (mask & __GFP_WAIT)) { |
c7bc6319c Btrfs: avoid prem... |
569 570 571 572 573 574 575 |
/* * Don't care for allocation failure here because we might end * up not needing the pre-allocated extent state at all, which * is the case if we only have in the tree extent states that * cover our input range and don't cover too any other range. * If we end up needing a new extent state we allocate it later. */ |
d1310b2e0 Btrfs: Split the ... |
576 |
prealloc = alloc_extent_state(mask); |
d1310b2e0 Btrfs: Split the ... |
577 |
} |
cad321ad5 Btrfs: shift all ... |
578 |
spin_lock(&tree->lock); |
2c64c53d8 Btrfs: cache valu... |
579 580 |
if (cached_state) { cached = *cached_state; |
2ac55d41b Btrfs: cache the ... |
581 582 583 584 585 |
if (clear) { *cached_state = NULL; cached_state = NULL; } |
27a3507de Btrfs: reduce siz... |
586 587 |
if (cached && extent_state_in_tree(cached) && cached->start <= start && cached->end > start) { |
2ac55d41b Btrfs: cache the ... |
588 589 |
if (clear) atomic_dec(&cached->refs); |
2c64c53d8 Btrfs: cache valu... |
590 |
state = cached; |
42daec299 Btrfs: fix errors... |
591 |
goto hit_next; |
2c64c53d8 Btrfs: cache valu... |
592 |
} |
2ac55d41b Btrfs: cache the ... |
593 594 |
if (clear) free_extent_state(cached); |
2c64c53d8 Btrfs: cache valu... |
595 |
} |
d1310b2e0 Btrfs: Split the ... |
596 597 598 599 |
/* * this search will find the extents that end after * our range starts */ |
80ea96b1f Btrfs: Add a look... |
600 |
node = tree_search(tree, start); |
d1310b2e0 Btrfs: Split the ... |
601 602 603 |
if (!node) goto out; state = rb_entry(node, struct extent_state, rb_node); |
2c64c53d8 Btrfs: cache valu... |
604 |
hit_next: |
d1310b2e0 Btrfs: Split the ... |
605 606 607 |
if (state->start > end) goto out; WARN_ON(state->end < start); |
5c939df56 btrfs: Fix set/cl... |
608 |
last_end = state->end; |
d1310b2e0 Btrfs: Split the ... |
609 |
|
0449314a9 Btrfs: skip state... |
610 |
/* the state doesn't have the wanted bits, go ahead */ |
cdc6a3952 Btrfs: avoid poss... |
611 612 |
if (!(state->state & bits)) { state = next_state(state); |
0449314a9 Btrfs: skip state... |
613 |
goto next; |
cdc6a3952 Btrfs: avoid poss... |
614 |
} |
0449314a9 Btrfs: skip state... |
615 |
|
d1310b2e0 Btrfs: Split the ... |
616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 |
/* * | ---- desired range ---- | * | state | or * | ------------- state -------------- | * * We need to split the extent we found, and may flip * bits on second half. * * If the extent we found extends past our range, we * just split and search again. It'll get split again * the next time though. * * If the extent we found is inside our range, we clear * the desired bit on it. */ if (state->start < start) { |
8233767a2 Btrfs: allocate e... |
633 634 |
prealloc = alloc_extent_state_atomic(prealloc); BUG_ON(!prealloc); |
d1310b2e0 Btrfs: Split the ... |
635 |
err = split_state(tree, state, prealloc, start); |
c2d904e08 btrfs: Catch lock... |
636 637 |
if (err) extent_io_tree_panic(tree, err); |
d1310b2e0 Btrfs: Split the ... |
638 639 640 641 |
prealloc = NULL; if (err) goto out; if (state->end <= end) { |
d1ac6e41d Btrfs: use fastpa... |
642 643 |
state = clear_state_bit(tree, state, &bits, wake); goto next; |
d1310b2e0 Btrfs: Split the ... |
644 645 646 647 648 649 650 651 652 653 |
} goto search_again; } /* * | ---- desired range ---- | * | state | * We need to split the extent, and clear the bit * on the first half */ if (state->start <= end && state->end > end) { |
8233767a2 Btrfs: allocate e... |
654 655 |
prealloc = alloc_extent_state_atomic(prealloc); BUG_ON(!prealloc); |
d1310b2e0 Btrfs: Split the ... |
656 |
err = split_state(tree, state, prealloc, end + 1); |
c2d904e08 btrfs: Catch lock... |
657 658 |
if (err) extent_io_tree_panic(tree, err); |
d1310b2e0 Btrfs: Split the ... |
659 660 |
if (wake) wake_up(&state->wq); |
42daec299 Btrfs: fix errors... |
661 |
|
6763af84a btrfs: Remove set... |
662 |
clear_state_bit(tree, prealloc, &bits, wake); |
9ed74f2db Btrfs: proper -EN... |
663 |
|
d1310b2e0 Btrfs: Split the ... |
664 665 666 |
prealloc = NULL; goto out; } |
42daec299 Btrfs: fix errors... |
667 |
|
cdc6a3952 Btrfs: avoid poss... |
668 |
state = clear_state_bit(tree, state, &bits, wake); |
0449314a9 Btrfs: skip state... |
669 |
next: |
5c939df56 btrfs: Fix set/cl... |
670 671 672 |
if (last_end == (u64)-1) goto out; start = last_end + 1; |
cdc6a3952 Btrfs: avoid poss... |
673 |
if (start <= end && state && !need_resched()) |
692e5759a Btrfs: be less st... |
674 |
goto hit_next; |
d1310b2e0 Btrfs: Split the ... |
675 676 677 |
goto search_again; out: |
cad321ad5 Btrfs: shift all ... |
678 |
spin_unlock(&tree->lock); |
d1310b2e0 Btrfs: Split the ... |
679 680 |
if (prealloc) free_extent_state(prealloc); |
6763af84a btrfs: Remove set... |
681 |
return 0; |
d1310b2e0 Btrfs: Split the ... |
682 683 684 685 |
search_again: if (start > end) goto out; |
cad321ad5 Btrfs: shift all ... |
686 |
spin_unlock(&tree->lock); |
d1310b2e0 Btrfs: Split the ... |
687 688 689 690 |
if (mask & __GFP_WAIT) cond_resched(); goto again; } |
d1310b2e0 Btrfs: Split the ... |
691 |
|
143bede52 btrfs: return voi... |
692 693 |
static void wait_on_state(struct extent_io_tree *tree, struct extent_state *state) |
641f5219f Btrfs: sparse loc... |
694 695 |
__releases(tree->lock) __acquires(tree->lock) |
d1310b2e0 Btrfs: Split the ... |
696 697 698 |
{ DEFINE_WAIT(wait); prepare_to_wait(&state->wq, &wait, TASK_UNINTERRUPTIBLE); |
cad321ad5 Btrfs: shift all ... |
699 |
spin_unlock(&tree->lock); |
d1310b2e0 Btrfs: Split the ... |
700 |
schedule(); |
cad321ad5 Btrfs: shift all ... |
701 |
spin_lock(&tree->lock); |
d1310b2e0 Btrfs: Split the ... |
702 |
finish_wait(&state->wq, &wait); |
d1310b2e0 Btrfs: Split the ... |
703 704 705 706 707 708 709 |
} /* * waits for one or more bits to clear on a range in the state tree. * The range [start, end] is inclusive. * The tree lock is taken by this function */ |
410748882 btrfs: use unsign... |
710 711 |
static void wait_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, unsigned long bits) |
d1310b2e0 Btrfs: Split the ... |
712 713 714 |
{ struct extent_state *state; struct rb_node *node; |
a5dee37d3 Btrfs: deal with ... |
715 |
btrfs_debug_check_extent_io_range(tree, start, end); |
8d599ae1b btrfs: add debug ... |
716 |
|
cad321ad5 Btrfs: shift all ... |
717 |
spin_lock(&tree->lock); |
d1310b2e0 Btrfs: Split the ... |
718 719 720 721 722 723 |
again: while (1) { /* * this search will find all the extents that end after * our range starts */ |
80ea96b1f Btrfs: Add a look... |
724 |
node = tree_search(tree, start); |
c50d3e71c Btrfs: more effic... |
725 |
process_node: |
d1310b2e0 Btrfs: Split the ... |
726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 |
if (!node) break; state = rb_entry(node, struct extent_state, rb_node); if (state->start > end) goto out; if (state->state & bits) { start = state->start; atomic_inc(&state->refs); wait_on_state(tree, state); free_extent_state(state); goto again; } start = state->end + 1; if (start > end) break; |
c50d3e71c Btrfs: more effic... |
745 746 747 748 |
if (!cond_resched_lock(&tree->lock)) { node = rb_next(node); goto process_node; } |
d1310b2e0 Btrfs: Split the ... |
749 750 |
} out: |
cad321ad5 Btrfs: shift all ... |
751 |
spin_unlock(&tree->lock); |
d1310b2e0 Btrfs: Split the ... |
752 |
} |
d1310b2e0 Btrfs: Split the ... |
753 |
|
1bf85046e btrfs: Make exten... |
754 |
static void set_state_bits(struct extent_io_tree *tree, |
d1310b2e0 Btrfs: Split the ... |
755 |
struct extent_state *state, |
410748882 btrfs: use unsign... |
756 |
unsigned long *bits) |
d1310b2e0 Btrfs: Split the ... |
757 |
{ |
410748882 btrfs: use unsign... |
758 |
unsigned long bits_to_set = *bits & ~EXTENT_CTLBITS; |
9ed74f2db Btrfs: proper -EN... |
759 |
|
1bf85046e btrfs: Make exten... |
760 |
set_state_cb(tree, state, bits); |
0ca1f7ceb Btrfs: Update met... |
761 |
if ((bits_to_set & EXTENT_DIRTY) && !(state->state & EXTENT_DIRTY)) { |
d1310b2e0 Btrfs: Split the ... |
762 763 764 |
u64 range = state->end - state->start + 1; tree->dirty_bytes += range; } |
0ca1f7ceb Btrfs: Update met... |
765 |
state->state |= bits_to_set; |
d1310b2e0 Btrfs: Split the ... |
766 |
} |
e38e2ed70 Btrfs: make find_... |
767 768 769 |
static void cache_state_if_flags(struct extent_state *state, struct extent_state **cached_ptr, const u64 flags) |
2c64c53d8 Btrfs: cache valu... |
770 771 |
{ if (cached_ptr && !(*cached_ptr)) { |
e38e2ed70 Btrfs: make find_... |
772 |
if (!flags || (state->state & flags)) { |
2c64c53d8 Btrfs: cache valu... |
773 774 775 776 777 |
*cached_ptr = state; atomic_inc(&state->refs); } } } |
e38e2ed70 Btrfs: make find_... |
778 779 780 781 782 783 |
static void cache_state(struct extent_state *state, struct extent_state **cached_ptr) { return cache_state_if_flags(state, cached_ptr, EXTENT_IOBITS | EXTENT_BOUNDARY); } |
d1310b2e0 Btrfs: Split the ... |
784 |
/* |
1edbb734b Btrfs: reduce CPU... |
785 786 |
* set some bits on a range in the tree. This may require allocations or * sleeping, so the gfp mask is used to indicate what is allowed. |
d1310b2e0 Btrfs: Split the ... |
787 |
* |
1edbb734b Btrfs: reduce CPU... |
788 789 790 |
* If any of the exclusive bits are set, this will fail with -EEXIST if some * part of the range already has the desired bits set. The start of the * existing range is returned in failed_start in this case. |
d1310b2e0 Btrfs: Split the ... |
791 |
* |
1edbb734b Btrfs: reduce CPU... |
792 |
* [start, end] is inclusive This takes the tree lock. |
d1310b2e0 Btrfs: Split the ... |
793 |
*/ |
1edbb734b Btrfs: reduce CPU... |
794 |
|
3fbe5c02a btrfs: split exte... |
795 796 |
static int __must_check __set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, |
410748882 btrfs: use unsign... |
797 798 799 |
unsigned long bits, unsigned long exclusive_bits, u64 *failed_start, struct extent_state **cached_state, gfp_t mask) |
d1310b2e0 Btrfs: Split the ... |
800 801 802 803 |
{ struct extent_state *state; struct extent_state *prealloc = NULL; struct rb_node *node; |
12cfbad90 Btrfs: more effic... |
804 805 |
struct rb_node **p; struct rb_node *parent; |
d1310b2e0 Btrfs: Split the ... |
806 |
int err = 0; |
d1310b2e0 Btrfs: Split the ... |
807 808 |
u64 last_start; u64 last_end; |
42daec299 Btrfs: fix errors... |
809 |
|
a5dee37d3 Btrfs: deal with ... |
810 |
btrfs_debug_check_extent_io_range(tree, start, end); |
8d599ae1b btrfs: add debug ... |
811 |
|
0ca1f7ceb Btrfs: Update met... |
812 |
bits |= EXTENT_FIRST_DELALLOC; |
d1310b2e0 Btrfs: Split the ... |
813 814 815 |
again: if (!prealloc && (mask & __GFP_WAIT)) { prealloc = alloc_extent_state(mask); |
8233767a2 Btrfs: allocate e... |
816 |
BUG_ON(!prealloc); |
d1310b2e0 Btrfs: Split the ... |
817 |
} |
cad321ad5 Btrfs: shift all ... |
818 |
spin_lock(&tree->lock); |
9655d2982 Btrfs: use a cach... |
819 820 |
if (cached_state && *cached_state) { state = *cached_state; |
df98b6e2c Btrfs: fix how we... |
821 |
if (state->start <= start && state->end > start && |
27a3507de Btrfs: reduce siz... |
822 |
extent_state_in_tree(state)) { |
9655d2982 Btrfs: use a cach... |
823 824 825 826 |
node = &state->rb_node; goto hit_next; } } |
d1310b2e0 Btrfs: Split the ... |
827 828 829 830 |
/* * this search will find all the extents that end after * our range starts. */ |
12cfbad90 Btrfs: more effic... |
831 |
node = tree_search_for_insert(tree, start, &p, &parent); |
d1310b2e0 Btrfs: Split the ... |
832 |
if (!node) { |
8233767a2 Btrfs: allocate e... |
833 834 |
prealloc = alloc_extent_state_atomic(prealloc); BUG_ON(!prealloc); |
12cfbad90 Btrfs: more effic... |
835 836 |
err = insert_state(tree, prealloc, start, end, &p, &parent, &bits); |
c2d904e08 btrfs: Catch lock... |
837 838 |
if (err) extent_io_tree_panic(tree, err); |
c42ac0bc9 Btrfs: add missin... |
839 |
cache_state(prealloc, cached_state); |
d1310b2e0 Btrfs: Split the ... |
840 |
prealloc = NULL; |
d1310b2e0 Btrfs: Split the ... |
841 842 |
goto out; } |
d1310b2e0 Btrfs: Split the ... |
843 |
state = rb_entry(node, struct extent_state, rb_node); |
40431d6c1 Btrfs: optimize s... |
844 |
hit_next: |
d1310b2e0 Btrfs: Split the ... |
845 846 847 848 849 850 851 852 853 854 |
last_start = state->start; last_end = state->end; /* * | ---- desired range ---- | * | state | * * Just lock what we found and keep going */ if (state->start == start && state->end <= end) { |
1edbb734b Btrfs: reduce CPU... |
855 |
if (state->state & exclusive_bits) { |
d1310b2e0 Btrfs: Split the ... |
856 857 858 859 |
*failed_start = state->start; err = -EEXIST; goto out; } |
42daec299 Btrfs: fix errors... |
860 |
|
1bf85046e btrfs: Make exten... |
861 |
set_state_bits(tree, state, &bits); |
2c64c53d8 Btrfs: cache valu... |
862 |
cache_state(state, cached_state); |
d1310b2e0 Btrfs: Split the ... |
863 |
merge_state(tree, state); |
5c939df56 btrfs: Fix set/cl... |
864 865 866 |
if (last_end == (u64)-1) goto out; start = last_end + 1; |
d1ac6e41d Btrfs: use fastpa... |
867 868 869 870 |
state = next_state(state); if (start < end && state && state->start == start && !need_resched()) goto hit_next; |
d1310b2e0 Btrfs: Split the ... |
871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 |
goto search_again; } /* * | ---- desired range ---- | * | state | * or * | ------------- state -------------- | * * We need to split the extent we found, and may flip bits on * second half. * * If the extent we found extends past our * range, we just split and search again. It'll get split * again the next time though. * * If the extent we found is inside our range, we set the * desired bit on it. */ if (state->start < start) { |
1edbb734b Btrfs: reduce CPU... |
891 |
if (state->state & exclusive_bits) { |
d1310b2e0 Btrfs: Split the ... |
892 893 894 895 |
*failed_start = start; err = -EEXIST; goto out; } |
8233767a2 Btrfs: allocate e... |
896 897 898 |
prealloc = alloc_extent_state_atomic(prealloc); BUG_ON(!prealloc); |
d1310b2e0 Btrfs: Split the ... |
899 |
err = split_state(tree, state, prealloc, start); |
c2d904e08 btrfs: Catch lock... |
900 901 |
if (err) extent_io_tree_panic(tree, err); |
d1310b2e0 Btrfs: Split the ... |
902 903 904 905 |
prealloc = NULL; if (err) goto out; if (state->end <= end) { |
1bf85046e btrfs: Make exten... |
906 |
set_state_bits(tree, state, &bits); |
2c64c53d8 Btrfs: cache valu... |
907 |
cache_state(state, cached_state); |
d1310b2e0 Btrfs: Split the ... |
908 |
merge_state(tree, state); |
5c939df56 btrfs: Fix set/cl... |
909 910 911 |
if (last_end == (u64)-1) goto out; start = last_end + 1; |
d1ac6e41d Btrfs: use fastpa... |
912 913 914 915 |
state = next_state(state); if (start < end && state && state->start == start && !need_resched()) goto hit_next; |
d1310b2e0 Btrfs: Split the ... |
916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 |
} goto search_again; } /* * | ---- desired range ---- | * | state | or | state | * * There's a hole, we need to insert something in it and * ignore the extent we found. */ if (state->start > start) { u64 this_end; if (end < last_start) this_end = end; else |
d397712bc Btrfs: Fix checkp... |
931 |
this_end = last_start - 1; |
8233767a2 Btrfs: allocate e... |
932 933 934 |
prealloc = alloc_extent_state_atomic(prealloc); BUG_ON(!prealloc); |
c7f895a2b Btrfs: fix unsafe... |
935 936 937 938 939 |
/* * Avoid to free 'prealloc' if it can be merged with * the later extent. */ |
d1310b2e0 Btrfs: Split the ... |
940 |
err = insert_state(tree, prealloc, start, this_end, |
12cfbad90 Btrfs: more effic... |
941 |
NULL, NULL, &bits); |
c2d904e08 btrfs: Catch lock... |
942 943 |
if (err) extent_io_tree_panic(tree, err); |
9ed74f2db Btrfs: proper -EN... |
944 945 |
cache_state(prealloc, cached_state); prealloc = NULL; |
d1310b2e0 Btrfs: Split the ... |
946 947 948 949 950 951 952 953 954 955 |
start = this_end + 1; goto search_again; } /* * | ---- desired range ---- | * | state | * We need to split the extent, and set the bit * on the first half */ if (state->start <= end && state->end > end) { |
1edbb734b Btrfs: reduce CPU... |
956 |
if (state->state & exclusive_bits) { |
d1310b2e0 Btrfs: Split the ... |
957 958 959 960 |
*failed_start = start; err = -EEXIST; goto out; } |
8233767a2 Btrfs: allocate e... |
961 962 963 |
prealloc = alloc_extent_state_atomic(prealloc); BUG_ON(!prealloc); |
d1310b2e0 Btrfs: Split the ... |
964 |
err = split_state(tree, state, prealloc, end + 1); |
c2d904e08 btrfs: Catch lock... |
965 966 |
if (err) extent_io_tree_panic(tree, err); |
d1310b2e0 Btrfs: Split the ... |
967 |
|
1bf85046e btrfs: Make exten... |
968 |
set_state_bits(tree, prealloc, &bits); |
2c64c53d8 Btrfs: cache valu... |
969 |
cache_state(prealloc, cached_state); |
d1310b2e0 Btrfs: Split the ... |
970 971 972 973 974 975 976 977 |
merge_state(tree, prealloc); prealloc = NULL; goto out; } goto search_again; out: |
cad321ad5 Btrfs: shift all ... |
978 |
spin_unlock(&tree->lock); |
d1310b2e0 Btrfs: Split the ... |
979 980 981 982 983 984 985 986 |
if (prealloc) free_extent_state(prealloc); return err; search_again: if (start > end) goto out; |
cad321ad5 Btrfs: shift all ... |
987 |
spin_unlock(&tree->lock); |
d1310b2e0 Btrfs: Split the ... |
988 989 990 991 |
if (mask & __GFP_WAIT) cond_resched(); goto again; } |
d1310b2e0 Btrfs: Split the ... |
992 |
|
410748882 btrfs: use unsign... |
993 994 995 |
int set_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, unsigned long bits, u64 * failed_start, struct extent_state **cached_state, gfp_t mask) |
3fbe5c02a btrfs: split exte... |
996 997 998 999 |
{ return __set_extent_bit(tree, start, end, bits, 0, failed_start, cached_state, mask); } |
462d6fac8 Btrfs: introduce ... |
1000 |
/** |
10983f2e8 Btrfs: fix typo i... |
1001 1002 |
* convert_extent_bit - convert all bits in a given range from one bit to * another |
462d6fac8 Btrfs: introduce ... |
1003 1004 1005 1006 1007 |
* @tree: the io tree to search * @start: the start offset in bytes * @end: the end offset in bytes (inclusive) * @bits: the bits to set in this range * @clear_bits: the bits to clear in this range |
e6138876a Btrfs: cache exte... |
1008 |
* @cached_state: state that we're going to cache |
462d6fac8 Btrfs: introduce ... |
1009 1010 1011 1012 1013 1014 1015 1016 1017 |
* @mask: the allocation mask * * This will go through and set bits for the given range. If any states exist * already in this range they are set with the given bit and cleared of the * clear_bits. This is only meant to be used by things that are mergeable, ie * converting from say DELALLOC to DIRTY. This is not meant to be used with * boundary bits like LOCK. */ int convert_extent_bit(struct extent_io_tree *tree, u64 start, u64 end, |
410748882 btrfs: use unsign... |
1018 |
unsigned long bits, unsigned long clear_bits, |
e6138876a Btrfs: cache exte... |
1019 |
struct extent_state **cached_state, gfp_t mask) |
462d6fac8 Btrfs: introduce ... |
1020 1021 1022 1023 |
{ struct extent_state *state; struct extent_state *prealloc = NULL; struct rb_node *node; |
12cfbad90 Btrfs: more effic... |
1024 1025 |
struct rb_node **p; struct rb_node *parent; |
462d6fac8 Btrfs: introduce ... |
1026 1027 1028 |
int err = 0; u64 last_start; u64 last_end; |
c8fd3de79 Btrfs: avoid retu... |
1029 |
bool first_iteration = true; |
462d6fac8 Btrfs: introduce ... |
1030 |
|
a5dee37d3 Btrfs: deal with ... |
1031 |
btrfs_debug_check_extent_io_range(tree, start, end); |
8d599ae1b btrfs: add debug ... |
1032 |
|
462d6fac8 Btrfs: introduce ... |
1033 1034 |
again: if (!prealloc && (mask & __GFP_WAIT)) { |
c8fd3de79 Btrfs: avoid retu... |
1035 1036 1037 1038 1039 1040 1041 |
/* * Best effort, don't worry if extent state allocation fails * here for the first iteration. We might have a cached state * that matches exactly the target range, in which case no * extent state allocations are needed. We'll only know this * after locking the tree. */ |
462d6fac8 Btrfs: introduce ... |
1042 |
prealloc = alloc_extent_state(mask); |
c8fd3de79 Btrfs: avoid retu... |
1043 |
if (!prealloc && !first_iteration) |
462d6fac8 Btrfs: introduce ... |
1044 1045 1046 1047 |
return -ENOMEM; } spin_lock(&tree->lock); |
e6138876a Btrfs: cache exte... |
1048 1049 1050 |
if (cached_state && *cached_state) { state = *cached_state; if (state->start <= start && state->end > start && |
27a3507de Btrfs: reduce siz... |
1051 |
extent_state_in_tree(state)) { |
e6138876a Btrfs: cache exte... |
1052 1053 1054 1055 |
node = &state->rb_node; goto hit_next; } } |
462d6fac8 Btrfs: introduce ... |
1056 1057 1058 1059 |
/* * this search will find all the extents that end after * our range starts. */ |
12cfbad90 Btrfs: more effic... |
1060 |
node = tree_search_for_insert(tree, start, &p, &parent); |
462d6fac8 Btrfs: introduce ... |
1061 1062 |
if (!node) { prealloc = alloc_extent_state_atomic(prealloc); |
1cf4ffdb3 Btrfs: drop spin ... |
1063 1064 1065 1066 |
if (!prealloc) { err = -ENOMEM; goto out; } |
12cfbad90 Btrfs: more effic... |
1067 1068 |
err = insert_state(tree, prealloc, start, end, &p, &parent, &bits); |
c2d904e08 btrfs: Catch lock... |
1069 1070 |
if (err) extent_io_tree_panic(tree, err); |
c42ac0bc9 Btrfs: add missin... |
1071 1072 |
cache_state(prealloc, cached_state); prealloc = NULL; |
462d6fac8 Btrfs: introduce ... |
1073 1074 1075 1076 1077 1078 1079 1080 1081 1082 1083 1084 1085 1086 |
goto out; } state = rb_entry(node, struct extent_state, rb_node); hit_next: last_start = state->start; last_end = state->end; /* * | ---- desired range ---- | * | state | * * Just lock what we found and keep going */ if (state->start == start && state->end <= end) { |
462d6fac8 Btrfs: introduce ... |
1087 |
set_state_bits(tree, state, &bits); |
e6138876a Btrfs: cache exte... |
1088 |
cache_state(state, cached_state); |
d1ac6e41d Btrfs: use fastpa... |
1089 |
state = clear_state_bit(tree, state, &clear_bits, 0); |
462d6fac8 Btrfs: introduce ... |
1090 1091 |
if (last_end == (u64)-1) goto out; |
462d6fac8 Btrfs: introduce ... |
1092 |
start = last_end + 1; |
d1ac6e41d Btrfs: use fastpa... |
1093 1094 1095 |
if (start < end && state && state->start == start && !need_resched()) goto hit_next; |
462d6fac8 Btrfs: introduce ... |
1096 1097 1098 1099 1100 1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 |
goto search_again; } /* * | ---- desired range ---- | * | state | * or * | ------------- state -------------- | * * We need to split the extent we found, and may flip bits on * second half. * * If the extent we found extends past our * range, we just split and search again. It'll get split * again the next time though. * * If the extent we found is inside our range, we set the * desired bit on it. */ if (state->start < start) { prealloc = alloc_extent_state_atomic(prealloc); |
1cf4ffdb3 Btrfs: drop spin ... |
1117 1118 1119 1120 |
if (!prealloc) { err = -ENOMEM; goto out; } |
462d6fac8 Btrfs: introduce ... |
1121 |
err = split_state(tree, state, prealloc, start); |
c2d904e08 btrfs: Catch lock... |
1122 1123 |
if (err) extent_io_tree_panic(tree, err); |
462d6fac8 Btrfs: introduce ... |
1124 1125 1126 1127 1128 |
prealloc = NULL; if (err) goto out; if (state->end <= end) { set_state_bits(tree, state, &bits); |
e6138876a Btrfs: cache exte... |
1129 |
cache_state(state, cached_state); |
d1ac6e41d Btrfs: use fastpa... |
1130 |
state = clear_state_bit(tree, state, &clear_bits, 0); |
462d6fac8 Btrfs: introduce ... |
1131 1132 1133 |
if (last_end == (u64)-1) goto out; start = last_end + 1; |
d1ac6e41d Btrfs: use fastpa... |
1134 1135 1136 |
if (start < end && state && state->start == start && !need_resched()) goto hit_next; |
462d6fac8 Btrfs: introduce ... |
1137 1138 1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 |
} goto search_again; } /* * | ---- desired range ---- | * | state | or | state | * * There's a hole, we need to insert something in it and * ignore the extent we found. */ if (state->start > start) { u64 this_end; if (end < last_start) this_end = end; else this_end = last_start - 1; prealloc = alloc_extent_state_atomic(prealloc); |
1cf4ffdb3 Btrfs: drop spin ... |
1155 1156 1157 1158 |
if (!prealloc) { err = -ENOMEM; goto out; } |
462d6fac8 Btrfs: introduce ... |
1159 1160 1161 1162 1163 1164 |
/* * Avoid to free 'prealloc' if it can be merged with * the later extent. */ err = insert_state(tree, prealloc, start, this_end, |
12cfbad90 Btrfs: more effic... |
1165 |
NULL, NULL, &bits); |
c2d904e08 btrfs: Catch lock... |
1166 1167 |
if (err) extent_io_tree_panic(tree, err); |
e6138876a Btrfs: cache exte... |
1168 |
cache_state(prealloc, cached_state); |
462d6fac8 Btrfs: introduce ... |
1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 1179 1180 |
prealloc = NULL; start = this_end + 1; goto search_again; } /* * | ---- desired range ---- | * | state | * We need to split the extent, and set the bit * on the first half */ if (state->start <= end && state->end > end) { prealloc = alloc_extent_state_atomic(prealloc); |
1cf4ffdb3 Btrfs: drop spin ... |
1181 1182 1183 1184 |
if (!prealloc) { err = -ENOMEM; goto out; } |
462d6fac8 Btrfs: introduce ... |
1185 1186 |
err = split_state(tree, state, prealloc, end + 1); |
c2d904e08 btrfs: Catch lock... |
1187 1188 |
if (err) extent_io_tree_panic(tree, err); |
462d6fac8 Btrfs: introduce ... |
1189 1190 |
set_state_bits(tree, prealloc, &bits); |
e6138876a Btrfs: cache exte... |
1191 |
cache_state(prealloc, cached_state); |
462d6fac8 Btrfs: introduce ... |
1192 |
clear_state_bit(tree, prealloc, &clear_bits, 0); |
462d6fac8 Btrfs: introduce ... |
1193 1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 1204 1205 1206 1207 1208 1209 1210 1211 |
prealloc = NULL; goto out; } goto search_again; out: spin_unlock(&tree->lock); if (prealloc) free_extent_state(prealloc); return err; search_again: if (start > end) goto out; spin_unlock(&tree->lock); if (mask & __GFP_WAIT) cond_resched(); |
c8fd3de79 Btrfs: avoid retu... |
1212 |
first_iteration = false; |
462d6fac8 Btrfs: introduce ... |
1213 1214 |
goto again; } |
d1310b2e0 Btrfs: Split the ... |
1215 1216 1217 1218 |
/* wrappers around set/clear extent bit */ int set_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask) { |
3fbe5c02a btrfs: split exte... |
1219 |
return set_extent_bit(tree, start, end, EXTENT_DIRTY, NULL, |
2c64c53d8 Btrfs: cache valu... |
1220 |
NULL, mask); |
d1310b2e0 Btrfs: Split the ... |
1221 |
} |
d1310b2e0 Btrfs: Split the ... |
1222 1223 |
int set_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, |
410748882 btrfs: use unsign... |
1224 |
unsigned long bits, gfp_t mask) |
d1310b2e0 Btrfs: Split the ... |
1225 |
{ |
3fbe5c02a btrfs: split exte... |
1226 |
return set_extent_bit(tree, start, end, bits, NULL, |
2c64c53d8 Btrfs: cache valu... |
1227 |
NULL, mask); |
d1310b2e0 Btrfs: Split the ... |
1228 |
} |
d1310b2e0 Btrfs: Split the ... |
1229 1230 |
int clear_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, |
410748882 btrfs: use unsign... |
1231 |
unsigned long bits, gfp_t mask) |
d1310b2e0 Btrfs: Split the ... |
1232 |
{ |
2c64c53d8 Btrfs: cache valu... |
1233 |
return clear_extent_bit(tree, start, end, bits, 0, 0, NULL, mask); |
d1310b2e0 Btrfs: Split the ... |
1234 |
} |
d1310b2e0 Btrfs: Split the ... |
1235 1236 |
int set_extent_delalloc(struct extent_io_tree *tree, u64 start, u64 end, |
2ac55d41b Btrfs: cache the ... |
1237 |
struct extent_state **cached_state, gfp_t mask) |
d1310b2e0 Btrfs: Split the ... |
1238 1239 |
{ return set_extent_bit(tree, start, end, |
fee187d9d Btrfs: do not set... |
1240 |
EXTENT_DELALLOC | EXTENT_UPTODATE, |
3fbe5c02a btrfs: split exte... |
1241 |
NULL, cached_state, mask); |
d1310b2e0 Btrfs: Split the ... |
1242 |
} |
d1310b2e0 Btrfs: Split the ... |
1243 |
|
9e8a4a8b0 Btrfs: use flag E... |
1244 1245 1246 1247 1248 1249 1250 |
int set_extent_defrag(struct extent_io_tree *tree, u64 start, u64 end, struct extent_state **cached_state, gfp_t mask) { return set_extent_bit(tree, start, end, EXTENT_DELALLOC | EXTENT_UPTODATE | EXTENT_DEFRAG, NULL, cached_state, mask); } |
d1310b2e0 Btrfs: Split the ... |
1251 1252 1253 1254 |
int clear_extent_dirty(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask) { return clear_extent_bit(tree, start, end, |
32c00aff7 Btrfs: release de... |
1255 |
EXTENT_DIRTY | EXTENT_DELALLOC | |
0ca1f7ceb Btrfs: Update met... |
1256 |
EXTENT_DO_ACCOUNTING, 0, 0, NULL, mask); |
d1310b2e0 Btrfs: Split the ... |
1257 |
} |
d1310b2e0 Btrfs: Split the ... |
1258 1259 1260 1261 |
int set_extent_new(struct extent_io_tree *tree, u64 start, u64 end, gfp_t mask) { |
3fbe5c02a btrfs: split exte... |
1262 |
return set_extent_bit(tree, start, end, EXTENT_NEW, NULL, |
2c64c53d8 Btrfs: cache valu... |
1263 |
NULL, mask); |
d1310b2e0 Btrfs: Split the ... |
1264 |
} |
d1310b2e0 Btrfs: Split the ... |
1265 |
|
d1310b2e0 Btrfs: Split the ... |
1266 |
int set_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end, |
507903b81 btrfs: using cach... |
1267 |
struct extent_state **cached_state, gfp_t mask) |
d1310b2e0 Btrfs: Split the ... |
1268 |
{ |
6b67a3200 Btrfs: pass NULL ... |
1269 |
return set_extent_bit(tree, start, end, EXTENT_UPTODATE, NULL, |
3fbe5c02a btrfs: split exte... |
1270 |
cached_state, mask); |
d1310b2e0 Btrfs: Split the ... |
1271 |
} |
d1310b2e0 Btrfs: Split the ... |
1272 |
|
5fd020435 Btrfs: finish ord... |
1273 1274 |
int clear_extent_uptodate(struct extent_io_tree *tree, u64 start, u64 end, struct extent_state **cached_state, gfp_t mask) |
d1310b2e0 Btrfs: Split the ... |
1275 |
{ |
2c64c53d8 Btrfs: cache valu... |
1276 |
return clear_extent_bit(tree, start, end, EXTENT_UPTODATE, 0, 0, |
2ac55d41b Btrfs: cache the ... |
1277 |
cached_state, mask); |
d1310b2e0 Btrfs: Split the ... |
1278 |
} |
d1310b2e0 Btrfs: Split the ... |
1279 |
|
d352ac681 Btrfs: add and im... |
1280 1281 1282 1283 |
/* * either insert or lock state struct between start and end use mask to tell * us if waiting is desired. */ |
1edbb734b Btrfs: reduce CPU... |
1284 |
int lock_extent_bits(struct extent_io_tree *tree, u64 start, u64 end, |
410748882 btrfs: use unsign... |
1285 |
unsigned long bits, struct extent_state **cached_state) |
d1310b2e0 Btrfs: Split the ... |
1286 1287 1288 1289 |
{ int err; u64 failed_start; while (1) { |
3fbe5c02a btrfs: split exte... |
1290 1291 1292 |
err = __set_extent_bit(tree, start, end, EXTENT_LOCKED | bits, EXTENT_LOCKED, &failed_start, cached_state, GFP_NOFS); |
d0082371c btrfs: drop gfp_t... |
1293 |
if (err == -EEXIST) { |
d1310b2e0 Btrfs: Split the ... |
1294 1295 |
wait_extent_bit(tree, failed_start, end, EXTENT_LOCKED); start = failed_start; |
d0082371c btrfs: drop gfp_t... |
1296 |
} else |
d1310b2e0 Btrfs: Split the ... |
1297 |
break; |
d1310b2e0 Btrfs: Split the ... |
1298 1299 1300 1301 |
WARN_ON(start > end); } return err; } |
d1310b2e0 Btrfs: Split the ... |
1302 |
|
d0082371c btrfs: drop gfp_t... |
1303 |
int lock_extent(struct extent_io_tree *tree, u64 start, u64 end) |
1edbb734b Btrfs: reduce CPU... |
1304 |
{ |
d0082371c btrfs: drop gfp_t... |
1305 |
return lock_extent_bits(tree, start, end, 0, NULL); |
1edbb734b Btrfs: reduce CPU... |
1306 |
} |
d0082371c btrfs: drop gfp_t... |
1307 |
int try_lock_extent(struct extent_io_tree *tree, u64 start, u64 end) |
251792013 Btrfs: nuke fs wi... |
1308 1309 1310 |
{ int err; u64 failed_start; |
3fbe5c02a btrfs: split exte... |
1311 1312 |
err = __set_extent_bit(tree, start, end, EXTENT_LOCKED, EXTENT_LOCKED, &failed_start, NULL, GFP_NOFS); |
6643558db Btrfs: Fix booken... |
1313 1314 1315 |
if (err == -EEXIST) { if (failed_start > start) clear_extent_bit(tree, start, failed_start - 1, |
d0082371c btrfs: drop gfp_t... |
1316 |
EXTENT_LOCKED, 1, 0, NULL, GFP_NOFS); |
251792013 Btrfs: nuke fs wi... |
1317 |
return 0; |
6643558db Btrfs: Fix booken... |
1318 |
} |
251792013 Btrfs: nuke fs wi... |
1319 1320 |
return 1; } |
251792013 Btrfs: nuke fs wi... |
1321 |
|
2c64c53d8 Btrfs: cache valu... |
1322 1323 1324 1325 1326 1327 |
int unlock_extent_cached(struct extent_io_tree *tree, u64 start, u64 end, struct extent_state **cached, gfp_t mask) { return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, cached, mask); } |
d0082371c btrfs: drop gfp_t... |
1328 |
int unlock_extent(struct extent_io_tree *tree, u64 start, u64 end) |
d1310b2e0 Btrfs: Split the ... |
1329 |
{ |
2c64c53d8 Btrfs: cache valu... |
1330 |
return clear_extent_bit(tree, start, end, EXTENT_LOCKED, 1, 0, NULL, |
d0082371c btrfs: drop gfp_t... |
1331 |
GFP_NOFS); |
d1310b2e0 Btrfs: Split the ... |
1332 |
} |
d1310b2e0 Btrfs: Split the ... |
1333 |
|
4adaa6110 Btrfs: fix race b... |
1334 1335 1336 1337 1338 1339 1340 1341 1342 1343 1344 1345 1346 1347 1348 1349 1350 1351 1352 1353 1354 1355 1356 1357 1358 1359 1360 1361 1362 1363 1364 1365 |
int extent_range_clear_dirty_for_io(struct inode *inode, u64 start, u64 end) { unsigned long index = start >> PAGE_CACHE_SHIFT; unsigned long end_index = end >> PAGE_CACHE_SHIFT; struct page *page; while (index <= end_index) { page = find_get_page(inode->i_mapping, index); BUG_ON(!page); /* Pages should be in the extent_io_tree */ clear_page_dirty_for_io(page); page_cache_release(page); index++; } return 0; } int extent_range_redirty_for_io(struct inode *inode, u64 start, u64 end) { unsigned long index = start >> PAGE_CACHE_SHIFT; unsigned long end_index = end >> PAGE_CACHE_SHIFT; struct page *page; while (index <= end_index) { page = find_get_page(inode->i_mapping, index); BUG_ON(!page); /* Pages should be in the extent_io_tree */ account_page_redirty(page); __set_page_dirty_nobuffers(page); page_cache_release(page); index++; } return 0; } |
d1310b2e0 Btrfs: Split the ... |
1366 |
/* |
d1310b2e0 Btrfs: Split the ... |
1367 1368 |
* helper function to set both pages and extents in the tree writeback */ |
b2950863c Btrfs: make thing... |
1369 |
static int set_range_writeback(struct extent_io_tree *tree, u64 start, u64 end) |
d1310b2e0 Btrfs: Split the ... |
1370 1371 1372 1373 1374 1375 1376 |
{ unsigned long index = start >> PAGE_CACHE_SHIFT; unsigned long end_index = end >> PAGE_CACHE_SHIFT; struct page *page; while (index <= end_index) { page = find_get_page(tree->mapping, index); |
79787eaab btrfs: replace ma... |
1377 |
BUG_ON(!page); /* Pages should be in the extent_io_tree */ |
d1310b2e0 Btrfs: Split the ... |
1378 1379 1380 1381 |
set_page_writeback(page); page_cache_release(page); index++; } |
d1310b2e0 Btrfs: Split the ... |
1382 1383 |
return 0; } |
d1310b2e0 Btrfs: Split the ... |
1384 |
|
d352ac681 Btrfs: add and im... |
1385 1386 1387 1388 |
/* find the first state struct with 'bits' set after 'start', and * return it. tree->lock must be held. NULL will returned if * nothing was found after 'start' */ |
48a3b6366 btrfs: make stati... |
1389 1390 |
static struct extent_state * find_first_extent_bit_state(struct extent_io_tree *tree, |
410748882 btrfs: use unsign... |
1391 |
u64 start, unsigned long bits) |
d7fc640e6 Btrfs: Allocator ... |
1392 1393 1394 1395 1396 1397 1398 1399 1400 |
{ struct rb_node *node; struct extent_state *state; /* * this search will find all the extents that end after * our range starts. */ node = tree_search(tree, start); |
d397712bc Btrfs: Fix checkp... |
1401 |
if (!node) |
d7fc640e6 Btrfs: Allocator ... |
1402 |
goto out; |
d7fc640e6 Btrfs: Allocator ... |
1403 |
|
d397712bc Btrfs: Fix checkp... |
1404 |
while (1) { |
d7fc640e6 Btrfs: Allocator ... |
1405 |
state = rb_entry(node, struct extent_state, rb_node); |
d397712bc Btrfs: Fix checkp... |
1406 |
if (state->end >= start && (state->state & bits)) |
d7fc640e6 Btrfs: Allocator ... |
1407 |
return state; |
d397712bc Btrfs: Fix checkp... |
1408 |
|
d7fc640e6 Btrfs: Allocator ... |
1409 1410 1411 1412 1413 1414 1415 |
node = rb_next(node); if (!node) break; } out: return NULL; } |
d7fc640e6 Btrfs: Allocator ... |
1416 |
|
d352ac681 Btrfs: add and im... |
1417 |
/* |
69261c4b6 Btrfs: clean up f... |
1418 1419 1420 1421 |
* find the first offset in the io tree with 'bits' set. zero is * returned if we find something, and *start_ret and *end_ret are * set to reflect the state struct that was found. * |
477d7eafa Btrfs: fix the co... |
1422 |
* If nothing was found, 1 is returned. If found something, return 0. |
69261c4b6 Btrfs: clean up f... |
1423 1424 |
*/ int find_first_extent_bit(struct extent_io_tree *tree, u64 start, |
410748882 btrfs: use unsign... |
1425 |
u64 *start_ret, u64 *end_ret, unsigned long bits, |
e6138876a Btrfs: cache exte... |
1426 |
struct extent_state **cached_state) |
69261c4b6 Btrfs: clean up f... |
1427 1428 |
{ struct extent_state *state; |
e6138876a Btrfs: cache exte... |
1429 |
struct rb_node *n; |
69261c4b6 Btrfs: clean up f... |
1430 1431 1432 |
int ret = 1; spin_lock(&tree->lock); |
e6138876a Btrfs: cache exte... |
1433 1434 |
if (cached_state && *cached_state) { state = *cached_state; |
27a3507de Btrfs: reduce siz... |
1435 |
if (state->end == start - 1 && extent_state_in_tree(state)) { |
e6138876a Btrfs: cache exte... |
1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 |
n = rb_next(&state->rb_node); while (n) { state = rb_entry(n, struct extent_state, rb_node); if (state->state & bits) goto got_it; n = rb_next(n); } free_extent_state(*cached_state); *cached_state = NULL; goto out; } free_extent_state(*cached_state); *cached_state = NULL; } |
69261c4b6 Btrfs: clean up f... |
1451 |
state = find_first_extent_bit_state(tree, start, bits); |
e6138876a Btrfs: cache exte... |
1452 |
got_it: |
69261c4b6 Btrfs: clean up f... |
1453 |
if (state) { |
e38e2ed70 Btrfs: make find_... |
1454 |
cache_state_if_flags(state, cached_state, 0); |
69261c4b6 Btrfs: clean up f... |
1455 1456 1457 1458 |
*start_ret = state->start; *end_ret = state->end; ret = 0; } |
e6138876a Btrfs: cache exte... |
1459 |
out: |
69261c4b6 Btrfs: clean up f... |
1460 1461 1462 1463 1464 |
spin_unlock(&tree->lock); return ret; } /* |
d352ac681 Btrfs: add and im... |
1465 1466 1467 1468 1469 |
* find a contiguous range of bytes in the file marked as delalloc, not * more than 'max_bytes'. start and end are used to return the range, * * 1 is returned if we find something, 0 if nothing was in the tree */ |
c8b978188 Btrfs: Add zlib c... |
1470 |
static noinline u64 find_delalloc_range(struct extent_io_tree *tree, |
c2a128d28 Btrfs: cache exte... |
1471 1472 |
u64 *start, u64 *end, u64 max_bytes, struct extent_state **cached_state) |
d1310b2e0 Btrfs: Split the ... |
1473 1474 1475 1476 1477 1478 |
{ struct rb_node *node; struct extent_state *state; u64 cur_start = *start; u64 found = 0; u64 total_bytes = 0; |
cad321ad5 Btrfs: shift all ... |
1479 |
spin_lock(&tree->lock); |
c8b978188 Btrfs: Add zlib c... |
1480 |
|
d1310b2e0 Btrfs: Split the ... |
1481 1482 1483 1484 |
/* * this search will find all the extents that end after * our range starts. */ |
80ea96b1f Btrfs: Add a look... |
1485 |
node = tree_search(tree, cur_start); |
2b114d1d3 Btrfs: Correct us... |
1486 |
if (!node) { |
3b951516e Btrfs: Use the ex... |
1487 1488 |
if (!found) *end = (u64)-1; |
d1310b2e0 Btrfs: Split the ... |
1489 1490 |
goto out; } |
d397712bc Btrfs: Fix checkp... |
1491 |
while (1) { |
d1310b2e0 Btrfs: Split the ... |
1492 |
state = rb_entry(node, struct extent_state, rb_node); |
5b21f2ed3 Btrfs: extent_map... |
1493 1494 |
if (found && (state->start != cur_start || (state->state & EXTENT_BOUNDARY))) { |
d1310b2e0 Btrfs: Split the ... |
1495 1496 1497 1498 1499 1500 1501 |
goto out; } if (!(state->state & EXTENT_DELALLOC)) { if (!found) *end = state->end; goto out; } |
c2a128d28 Btrfs: cache exte... |
1502 |
if (!found) { |
d1310b2e0 Btrfs: Split the ... |
1503 |
*start = state->start; |
c2a128d28 Btrfs: cache exte... |
1504 1505 1506 |
*cached_state = state; atomic_inc(&state->refs); } |
d1310b2e0 Btrfs: Split the ... |
1507 1508 1509 1510 |
found++; *end = state->end; cur_start = state->end + 1; node = rb_next(node); |
d1310b2e0 Btrfs: Split the ... |
1511 |
total_bytes += state->end - state->start + 1; |
7bf811a59 Btrfs: limit dela... |
1512 |
if (total_bytes >= max_bytes) |
573aecafc Btrfs: actually l... |
1513 |
break; |
573aecafc Btrfs: actually l... |
1514 |
if (!node) |
d1310b2e0 Btrfs: Split the ... |
1515 1516 1517 |
break; } out: |
cad321ad5 Btrfs: shift all ... |
1518 |
spin_unlock(&tree->lock); |
d1310b2e0 Btrfs: Split the ... |
1519 1520 |
return found; } |
143bede52 btrfs: return voi... |
1521 1522 1523 |
static noinline void __unlock_for_delalloc(struct inode *inode, struct page *locked_page, u64 start, u64 end) |
c8b978188 Btrfs: Add zlib c... |
1524 1525 1526 1527 1528 1529 1530 1531 1532 |
{ int ret; struct page *pages[16]; unsigned long index = start >> PAGE_CACHE_SHIFT; unsigned long end_index = end >> PAGE_CACHE_SHIFT; unsigned long nr_pages = end_index - index + 1; int i; if (index == locked_page->index && end_index == index) |
143bede52 btrfs: return voi... |
1533 |
return; |
c8b978188 Btrfs: Add zlib c... |
1534 |
|
d397712bc Btrfs: Fix checkp... |
1535 |
while (nr_pages > 0) { |
c8b978188 Btrfs: Add zlib c... |
1536 |
ret = find_get_pages_contig(inode->i_mapping, index, |
5b050f04c Btrfs: Fix compil... |
1537 1538 |
min_t(unsigned long, nr_pages, ARRAY_SIZE(pages)), pages); |
c8b978188 Btrfs: Add zlib c... |
1539 1540 1541 1542 1543 1544 1545 1546 1547 |
for (i = 0; i < ret; i++) { if (pages[i] != locked_page) unlock_page(pages[i]); page_cache_release(pages[i]); } nr_pages -= ret; index += ret; cond_resched(); } |
c8b978188 Btrfs: Add zlib c... |
1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 |
} static noinline int lock_delalloc_pages(struct inode *inode, struct page *locked_page, u64 delalloc_start, u64 delalloc_end) { unsigned long index = delalloc_start >> PAGE_CACHE_SHIFT; unsigned long start_index = index; unsigned long end_index = delalloc_end >> PAGE_CACHE_SHIFT; unsigned long pages_locked = 0; struct page *pages[16]; unsigned long nrpages; int ret; int i; /* the caller is responsible for locking the start index */ if (index == locked_page->index && index == end_index) return 0; /* skip the page at the start index */ nrpages = end_index - index + 1; |
d397712bc Btrfs: Fix checkp... |
1570 |
while (nrpages > 0) { |
c8b978188 Btrfs: Add zlib c... |
1571 |
ret = find_get_pages_contig(inode->i_mapping, index, |
5b050f04c Btrfs: Fix compil... |
1572 1573 |
min_t(unsigned long, nrpages, ARRAY_SIZE(pages)), pages); |
c8b978188 Btrfs: Add zlib c... |
1574 1575 1576 1577 1578 1579 1580 1581 1582 1583 |
if (ret == 0) { ret = -EAGAIN; goto done; } /* now we have an array of pages, lock them all */ for (i = 0; i < ret; i++) { /* * the caller is taking responsibility for * locked_page */ |
771ed689d Btrfs: Optimize c... |
1584 |
if (pages[i] != locked_page) { |
c8b978188 Btrfs: Add zlib c... |
1585 |
lock_page(pages[i]); |
f2b1c41cf Btrfs: Make sure ... |
1586 1587 |
if (!PageDirty(pages[i]) || pages[i]->mapping != inode->i_mapping) { |
771ed689d Btrfs: Optimize c... |
1588 1589 1590 1591 1592 1593 |
ret = -EAGAIN; unlock_page(pages[i]); page_cache_release(pages[i]); goto done; } } |
c8b978188 Btrfs: Add zlib c... |
1594 |
page_cache_release(pages[i]); |
771ed689d Btrfs: Optimize c... |
1595 |
pages_locked++; |
c8b978188 Btrfs: Add zlib c... |
1596 |
} |
c8b978188 Btrfs: Add zlib c... |
1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 |
nrpages -= ret; index += ret; cond_resched(); } ret = 0; done: if (ret && pages_locked) { __unlock_for_delalloc(inode, locked_page, delalloc_start, ((u64)(start_index + pages_locked - 1)) << PAGE_CACHE_SHIFT); } return ret; } /* * find a contiguous range of bytes in the file marked as delalloc, not * more than 'max_bytes'. start and end are used to return the range, * * 1 is returned if we find something, 0 if nothing was in the tree */ |
294e30fee Btrfs: add tests ... |
1618 1619 1620 1621 |
STATIC u64 find_lock_delalloc_range(struct inode *inode, struct extent_io_tree *tree, struct page *locked_page, u64 *start, u64 *end, u64 max_bytes) |
c8b978188 Btrfs: Add zlib c... |
1622 1623 1624 1625 |
{ u64 delalloc_start; u64 delalloc_end; u64 found; |
9655d2982 Btrfs: use a cach... |
1626 |
struct extent_state *cached_state = NULL; |
c8b978188 Btrfs: Add zlib c... |
1627 1628 1629 1630 1631 1632 1633 1634 |
int ret; int loops = 0; again: /* step one, find a bunch of delalloc bytes starting at start */ delalloc_start = *start; delalloc_end = 0; found = find_delalloc_range(tree, &delalloc_start, &delalloc_end, |
c2a128d28 Btrfs: cache exte... |
1635 |
max_bytes, &cached_state); |
70b99e695 Btrfs: Compressio... |
1636 |
if (!found || delalloc_end <= *start) { |
c8b978188 Btrfs: Add zlib c... |
1637 1638 |
*start = delalloc_start; *end = delalloc_end; |
c2a128d28 Btrfs: cache exte... |
1639 |
free_extent_state(cached_state); |
385fe0bed Btrfs: fix crash ... |
1640 |
return 0; |
c8b978188 Btrfs: Add zlib c... |
1641 1642 1643 |
} /* |
70b99e695 Btrfs: Compressio... |
1644 1645 1646 1647 |
* start comes from the offset of locked_page. We have to lock * pages in order, so we can't process delalloc bytes before * locked_page */ |
d397712bc Btrfs: Fix checkp... |
1648 |
if (delalloc_start < *start) |
70b99e695 Btrfs: Compressio... |
1649 |
delalloc_start = *start; |
70b99e695 Btrfs: Compressio... |
1650 1651 |
/* |
c8b978188 Btrfs: Add zlib c... |
1652 |
* make sure to limit the number of pages we try to lock down |
c8b978188 Btrfs: Add zlib c... |
1653 |
*/ |
7bf811a59 Btrfs: limit dela... |
1654 1655 |
if (delalloc_end + 1 - delalloc_start > max_bytes) delalloc_end = delalloc_start + max_bytes - 1; |
d397712bc Btrfs: Fix checkp... |
1656 |
|
c8b978188 Btrfs: Add zlib c... |
1657 1658 1659 1660 1661 1662 1663 |
/* step two, lock all the pages after the page that has start */ ret = lock_delalloc_pages(inode, locked_page, delalloc_start, delalloc_end); if (ret == -EAGAIN) { /* some of the pages are gone, lets avoid looping by * shortening the size of the delalloc range we're searching */ |
9655d2982 Btrfs: use a cach... |
1664 |
free_extent_state(cached_state); |
7d7887427 Btrfs: fix double... |
1665 |
cached_state = NULL; |
c8b978188 Btrfs: Add zlib c... |
1666 |
if (!loops) { |
7bf811a59 Btrfs: limit dela... |
1667 |
max_bytes = PAGE_CACHE_SIZE; |
c8b978188 Btrfs: Add zlib c... |
1668 1669 1670 1671 1672 1673 1674 |
loops = 1; goto again; } else { found = 0; goto out_failed; } } |
79787eaab btrfs: replace ma... |
1675 |
BUG_ON(ret); /* Only valid values are 0 and -EAGAIN */ |
c8b978188 Btrfs: Add zlib c... |
1676 1677 |
/* step three, lock the state bits for the whole range */ |
d0082371c btrfs: drop gfp_t... |
1678 |
lock_extent_bits(tree, delalloc_start, delalloc_end, 0, &cached_state); |
c8b978188 Btrfs: Add zlib c... |
1679 1680 1681 |
/* then test to make sure it is all still delalloc */ ret = test_range_bit(tree, delalloc_start, delalloc_end, |
9655d2982 Btrfs: use a cach... |
1682 |
EXTENT_DELALLOC, 1, cached_state); |
c8b978188 Btrfs: Add zlib c... |
1683 |
if (!ret) { |
9655d2982 Btrfs: use a cach... |
1684 1685 |
unlock_extent_cached(tree, delalloc_start, delalloc_end, &cached_state, GFP_NOFS); |
c8b978188 Btrfs: Add zlib c... |
1686 1687 1688 1689 1690 |
__unlock_for_delalloc(inode, locked_page, delalloc_start, delalloc_end); cond_resched(); goto again; } |
9655d2982 Btrfs: use a cach... |
1691 |
free_extent_state(cached_state); |
c8b978188 Btrfs: Add zlib c... |
1692 1693 1694 1695 1696 |
*start = delalloc_start; *end = delalloc_end; out_failed: return found; } |
c2790a2e2 Btrfs: cleanup ar... |
1697 1698 1699 1700 |
int extent_clear_unlock_delalloc(struct inode *inode, u64 start, u64 end, struct page *locked_page, unsigned long clear_bits, unsigned long page_ops) |
c8b978188 Btrfs: Add zlib c... |
1701 |
{ |
c2790a2e2 Btrfs: cleanup ar... |
1702 |
struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; |
c8b978188 Btrfs: Add zlib c... |
1703 1704 1705 1706 1707 1708 |
int ret; struct page *pages[16]; unsigned long index = start >> PAGE_CACHE_SHIFT; unsigned long end_index = end >> PAGE_CACHE_SHIFT; unsigned long nr_pages = end_index - index + 1; int i; |
771ed689d Btrfs: Optimize c... |
1709 |
|
2c64c53d8 Btrfs: cache valu... |
1710 |
clear_extent_bit(tree, start, end, clear_bits, 1, 0, NULL, GFP_NOFS); |
c2790a2e2 Btrfs: cleanup ar... |
1711 |
if (page_ops == 0) |
771ed689d Btrfs: Optimize c... |
1712 |
return 0; |
c8b978188 Btrfs: Add zlib c... |
1713 |
|
704de49d2 Btrfs: set page a... |
1714 1715 |
if ((page_ops & PAGE_SET_ERROR) && nr_pages > 0) mapping_set_error(inode->i_mapping, -EIO); |
d397712bc Btrfs: Fix checkp... |
1716 |
while (nr_pages > 0) { |
c8b978188 Btrfs: Add zlib c... |
1717 |
ret = find_get_pages_contig(inode->i_mapping, index, |
5b050f04c Btrfs: Fix compil... |
1718 1719 |
min_t(unsigned long, nr_pages, ARRAY_SIZE(pages)), pages); |
c8b978188 Btrfs: Add zlib c... |
1720 |
for (i = 0; i < ret; i++) { |
8b62b72b2 Btrfs: Use PagePr... |
1721 |
|
c2790a2e2 Btrfs: cleanup ar... |
1722 |
if (page_ops & PAGE_SET_PRIVATE2) |
8b62b72b2 Btrfs: Use PagePr... |
1723 |
SetPagePrivate2(pages[i]); |
c8b978188 Btrfs: Add zlib c... |
1724 1725 1726 1727 |
if (pages[i] == locked_page) { page_cache_release(pages[i]); continue; } |
c2790a2e2 Btrfs: cleanup ar... |
1728 |
if (page_ops & PAGE_CLEAR_DIRTY) |
c8b978188 Btrfs: Add zlib c... |
1729 |
clear_page_dirty_for_io(pages[i]); |
c2790a2e2 Btrfs: cleanup ar... |
1730 |
if (page_ops & PAGE_SET_WRITEBACK) |
c8b978188 Btrfs: Add zlib c... |
1731 |
set_page_writeback(pages[i]); |
704de49d2 Btrfs: set page a... |
1732 1733 |
if (page_ops & PAGE_SET_ERROR) SetPageError(pages[i]); |
c2790a2e2 Btrfs: cleanup ar... |
1734 |
if (page_ops & PAGE_END_WRITEBACK) |
c8b978188 Btrfs: Add zlib c... |
1735 |
end_page_writeback(pages[i]); |
c2790a2e2 Btrfs: cleanup ar... |
1736 |
if (page_ops & PAGE_UNLOCK) |
771ed689d Btrfs: Optimize c... |
1737 |
unlock_page(pages[i]); |
c8b978188 Btrfs: Add zlib c... |
1738 1739 1740 1741 1742 1743 1744 1745 |
page_cache_release(pages[i]); } nr_pages -= ret; index += ret; cond_resched(); } return 0; } |
c8b978188 Btrfs: Add zlib c... |
1746 |
|
d352ac681 Btrfs: add and im... |
1747 1748 1749 1750 1751 |
/* * count the number of bytes in the tree that have a given bit(s) * set. This can be fairly slow, except for EXTENT_DIRTY which is * cached. The total number found is returned. */ |
d1310b2e0 Btrfs: Split the ... |
1752 1753 |
u64 count_range_bits(struct extent_io_tree *tree, u64 *start, u64 search_end, u64 max_bytes, |
ec29ed5b4 Btrfs: fix fiemap... |
1754 |
unsigned long bits, int contig) |
d1310b2e0 Btrfs: Split the ... |
1755 1756 1757 1758 1759 |
{ struct rb_node *node; struct extent_state *state; u64 cur_start = *start; u64 total_bytes = 0; |
ec29ed5b4 Btrfs: fix fiemap... |
1760 |
u64 last = 0; |
d1310b2e0 Btrfs: Split the ... |
1761 |
int found = 0; |
fae7f21ce btrfs: Use WARN_O... |
1762 |
if (WARN_ON(search_end <= cur_start)) |
d1310b2e0 Btrfs: Split the ... |
1763 |
return 0; |
d1310b2e0 Btrfs: Split the ... |
1764 |
|
cad321ad5 Btrfs: shift all ... |
1765 |
spin_lock(&tree->lock); |
d1310b2e0 Btrfs: Split the ... |
1766 1767 1768 1769 1770 1771 1772 1773 |
if (cur_start == 0 && bits == EXTENT_DIRTY) { total_bytes = tree->dirty_bytes; goto out; } /* * this search will find all the extents that end after * our range starts. */ |
80ea96b1f Btrfs: Add a look... |
1774 |
node = tree_search(tree, cur_start); |
d397712bc Btrfs: Fix checkp... |
1775 |
if (!node) |
d1310b2e0 Btrfs: Split the ... |
1776 |
goto out; |
d1310b2e0 Btrfs: Split the ... |
1777 |
|
d397712bc Btrfs: Fix checkp... |
1778 |
while (1) { |
d1310b2e0 Btrfs: Split the ... |
1779 1780 1781 |
state = rb_entry(node, struct extent_state, rb_node); if (state->start > search_end) break; |
ec29ed5b4 Btrfs: fix fiemap... |
1782 1783 1784 |
if (contig && found && state->start > last + 1) break; if (state->end >= cur_start && (state->state & bits) == bits) { |
d1310b2e0 Btrfs: Split the ... |
1785 1786 1787 1788 1789 |
total_bytes += min(search_end, state->end) + 1 - max(cur_start, state->start); if (total_bytes >= max_bytes) break; if (!found) { |
af60bed24 Btrfs: set range_... |
1790 |
*start = max(cur_start, state->start); |
d1310b2e0 Btrfs: Split the ... |
1791 1792 |
found = 1; } |
ec29ed5b4 Btrfs: fix fiemap... |
1793 1794 1795 |
last = state->end; } else if (contig && found) { break; |
d1310b2e0 Btrfs: Split the ... |
1796 1797 1798 1799 1800 1801 |
} node = rb_next(node); if (!node) break; } out: |
cad321ad5 Btrfs: shift all ... |
1802 |
spin_unlock(&tree->lock); |
d1310b2e0 Btrfs: Split the ... |
1803 1804 |
return total_bytes; } |
b2950863c Btrfs: make thing... |
1805 |
|
d352ac681 Btrfs: add and im... |
1806 1807 1808 1809 |
/* * set the private field for a given byte offset in the tree. If there isn't * an extent_state there already, this does nothing. */ |
171170c1c btrfs: mark some ... |
1810 |
static int set_state_private(struct extent_io_tree *tree, u64 start, u64 private) |
d1310b2e0 Btrfs: Split the ... |
1811 1812 1813 1814 |
{ struct rb_node *node; struct extent_state *state; int ret = 0; |
cad321ad5 Btrfs: shift all ... |
1815 |
spin_lock(&tree->lock); |
d1310b2e0 Btrfs: Split the ... |
1816 1817 1818 1819 |
/* * this search will find all the extents that end after * our range starts. */ |
80ea96b1f Btrfs: Add a look... |
1820 |
node = tree_search(tree, start); |
2b114d1d3 Btrfs: Correct us... |
1821 |
if (!node) { |
d1310b2e0 Btrfs: Split the ... |
1822 1823 1824 1825 1826 1827 1828 1829 1830 1831 |
ret = -ENOENT; goto out; } state = rb_entry(node, struct extent_state, rb_node); if (state->start != start) { ret = -ENOENT; goto out; } state->private = private; out: |
cad321ad5 Btrfs: shift all ... |
1832 |
spin_unlock(&tree->lock); |
d1310b2e0 Btrfs: Split the ... |
1833 1834 1835 1836 1837 1838 1839 1840 |
return ret; } int get_state_private(struct extent_io_tree *tree, u64 start, u64 *private) { struct rb_node *node; struct extent_state *state; int ret = 0; |
cad321ad5 Btrfs: shift all ... |
1841 |
spin_lock(&tree->lock); |
d1310b2e0 Btrfs: Split the ... |
1842 1843 1844 1845 |
/* * this search will find all the extents that end after * our range starts. */ |
80ea96b1f Btrfs: Add a look... |
1846 |
node = tree_search(tree, start); |
2b114d1d3 Btrfs: Correct us... |
1847 |
if (!node) { |
d1310b2e0 Btrfs: Split the ... |
1848 1849 1850 1851 1852 1853 1854 1855 1856 1857 |
ret = -ENOENT; goto out; } state = rb_entry(node, struct extent_state, rb_node); if (state->start != start) { ret = -ENOENT; goto out; } *private = state->private; out: |
cad321ad5 Btrfs: shift all ... |
1858 |
spin_unlock(&tree->lock); |
d1310b2e0 Btrfs: Split the ... |
1859 1860 1861 1862 1863 |
return ret; } /* * searches a range in the state tree for a given mask. |
70dec8079 Btrfs: extent_io ... |
1864 |
* If 'filled' == 1, this returns 1 only if every extent in the tree |
d1310b2e0 Btrfs: Split the ... |
1865 1866 1867 1868 |
* has the bits set. Otherwise, 1 is returned if any bit in the * range is found set. */ int test_range_bit(struct extent_io_tree *tree, u64 start, u64 end, |
410748882 btrfs: use unsign... |
1869 |
unsigned long bits, int filled, struct extent_state *cached) |
d1310b2e0 Btrfs: Split the ... |
1870 1871 1872 1873 |
{ struct extent_state *state = NULL; struct rb_node *node; int bitset = 0; |
d1310b2e0 Btrfs: Split the ... |
1874 |
|
cad321ad5 Btrfs: shift all ... |
1875 |
spin_lock(&tree->lock); |
27a3507de Btrfs: reduce siz... |
1876 |
if (cached && extent_state_in_tree(cached) && cached->start <= start && |
df98b6e2c Btrfs: fix how we... |
1877 |
cached->end > start) |
9655d2982 Btrfs: use a cach... |
1878 1879 1880 |
node = &cached->rb_node; else node = tree_search(tree, start); |
d1310b2e0 Btrfs: Split the ... |
1881 1882 1883 1884 1885 1886 1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 |
while (node && start <= end) { state = rb_entry(node, struct extent_state, rb_node); if (filled && state->start > start) { bitset = 0; break; } if (state->start > end) break; if (state->state & bits) { bitset = 1; if (!filled) break; } else if (filled) { bitset = 0; break; } |
46562cec9 Btrfs: Fix test_r... |
1900 1901 1902 |
if (state->end == (u64)-1) break; |
d1310b2e0 Btrfs: Split the ... |
1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 |
start = state->end + 1; if (start > end) break; node = rb_next(node); if (!node) { if (filled) bitset = 0; break; } } |
cad321ad5 Btrfs: shift all ... |
1913 |
spin_unlock(&tree->lock); |
d1310b2e0 Btrfs: Split the ... |
1914 1915 |
return bitset; } |
d1310b2e0 Btrfs: Split the ... |
1916 1917 1918 1919 1920 |
/* * helper function to set a given page up to date if all the * extents in the tree for that page are up to date */ |
143bede52 btrfs: return voi... |
1921 |
static void check_page_uptodate(struct extent_io_tree *tree, struct page *page) |
d1310b2e0 Btrfs: Split the ... |
1922 |
{ |
4eee4fa4f Btrfs: use wrappe... |
1923 |
u64 start = page_offset(page); |
d1310b2e0 Btrfs: Split the ... |
1924 |
u64 end = start + PAGE_CACHE_SIZE - 1; |
9655d2982 Btrfs: use a cach... |
1925 |
if (test_range_bit(tree, start, end, EXTENT_UPTODATE, 1, NULL)) |
d1310b2e0 Btrfs: Split the ... |
1926 |
SetPageUptodate(page); |
d1310b2e0 Btrfs: Split the ... |
1927 |
} |
8b110e393 Btrfs: implement ... |
1928 |
int free_io_failure(struct inode *inode, struct io_failure_record *rec) |
4a54c8c16 btrfs: Moved repa... |
1929 1930 1931 1932 1933 1934 1935 1936 1937 1938 1939 |
{ int ret; int err = 0; struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree; set_state_private(failure_tree, rec->start, 0); ret = clear_extent_bits(failure_tree, rec->start, rec->start + rec->len - 1, EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS); if (ret) err = ret; |
53b381b3a Btrfs: RAID5 and ... |
1940 1941 1942 1943 1944 |
ret = clear_extent_bits(&BTRFS_I(inode)->io_tree, rec->start, rec->start + rec->len - 1, EXTENT_DAMAGED, GFP_NOFS); if (ret && !err) err = ret; |
4a54c8c16 btrfs: Moved repa... |
1945 1946 1947 1948 |
kfree(rec); return err; } |
4a54c8c16 btrfs: Moved repa... |
1949 1950 1951 1952 1953 |
/* * this bypasses the standard btrfs submit functions deliberately, as * the standard behavior is to write all copies in a raid setup. here we only * want to write the one bad copy. so we do the mapping for ourselves and issue * submit_bio directly. |
3ec706c83 Btrfs: pass fs_in... |
1954 |
* to avoid any synchronization issues, wait for the data after writing, which |
4a54c8c16 btrfs: Moved repa... |
1955 1956 1957 1958 |
* actually prevents the read that triggered the error from finishing. * currently, there can be no more than two copies of every data bit. thus, * exactly one rewrite is required. */ |
1203b6813 Btrfs: modify cle... |
1959 1960 |
int repair_io_failure(struct inode *inode, u64 start, u64 length, u64 logical, struct page *page, unsigned int pg_offset, int mirror_num) |
4a54c8c16 btrfs: Moved repa... |
1961 |
{ |
1203b6813 Btrfs: modify cle... |
1962 |
struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; |
4a54c8c16 btrfs: Moved repa... |
1963 1964 |
struct bio *bio; struct btrfs_device *dev; |
4a54c8c16 btrfs: Moved repa... |
1965 1966 1967 |
u64 map_length = 0; u64 sector; struct btrfs_bio *bbio = NULL; |
53b381b3a Btrfs: RAID5 and ... |
1968 |
struct btrfs_mapping_tree *map_tree = &fs_info->mapping_tree; |
4a54c8c16 btrfs: Moved repa... |
1969 |
int ret; |
908960c6c Btrfs: disable on... |
1970 |
ASSERT(!(fs_info->sb->s_flags & MS_RDONLY)); |
4a54c8c16 btrfs: Moved repa... |
1971 |
BUG_ON(!mirror_num); |
53b381b3a Btrfs: RAID5 and ... |
1972 1973 1974 |
/* we can't repair anything in raid56 yet */ if (btrfs_is_parity_mirror(map_tree, logical, length, mirror_num)) return 0; |
9be3395bc Btrfs: use a btrf... |
1975 |
bio = btrfs_io_bio_alloc(GFP_NOFS, 1); |
4a54c8c16 btrfs: Moved repa... |
1976 1977 |
if (!bio) return -EIO; |
4f024f379 block: Abstract o... |
1978 |
bio->bi_iter.bi_size = 0; |
4a54c8c16 btrfs: Moved repa... |
1979 |
map_length = length; |
3ec706c83 Btrfs: pass fs_in... |
1980 |
ret = btrfs_map_block(fs_info, WRITE, logical, |
4a54c8c16 btrfs: Moved repa... |
1981 1982 1983 1984 1985 1986 1987 |
&map_length, &bbio, mirror_num); if (ret) { bio_put(bio); return -EIO; } BUG_ON(mirror_num != bbio->mirror_num); sector = bbio->stripes[mirror_num-1].physical >> 9; |
4f024f379 block: Abstract o... |
1988 |
bio->bi_iter.bi_sector = sector; |
4a54c8c16 btrfs: Moved repa... |
1989 1990 1991 1992 1993 1994 1995 |
dev = bbio->stripes[mirror_num-1].dev; kfree(bbio); if (!dev || !dev->bdev || !dev->writeable) { bio_put(bio); return -EIO; } bio->bi_bdev = dev->bdev; |
ffdd2018d Btrfs: modify rep... |
1996 |
bio_add_page(bio, page, length, pg_offset); |
4a54c8c16 btrfs: Moved repa... |
1997 |
|
33879d451 block: submit_bio... |
1998 |
if (btrfsic_submit_bio_wait(WRITE_SYNC, bio)) { |
4a54c8c16 btrfs: Moved repa... |
1999 2000 |
/* try to remap that extent elsewhere? */ bio_put(bio); |
442a4f630 Btrfs: add device... |
2001 |
btrfs_dev_stat_inc_and_print(dev, BTRFS_DEV_STAT_WRITE_ERRS); |
4a54c8c16 btrfs: Moved repa... |
2002 2003 |
return -EIO; } |
efe120a06 Btrfs: convert pr... |
2004 |
printk_ratelimited_in_rcu(KERN_INFO |
1203b6813 Btrfs: modify cle... |
2005 2006 2007 2008 |
"BTRFS: read error corrected: ino %llu off %llu (dev %s sector %llu) ", btrfs_ino(inode), start, rcu_str_deref(dev->name), sector); |
4a54c8c16 btrfs: Moved repa... |
2009 2010 2011 |
bio_put(bio); return 0; } |
ea4667940 Btrfs: deal with ... |
2012 2013 2014 |
int repair_eb_io_failure(struct btrfs_root *root, struct extent_buffer *eb, int mirror_num) { |
ea4667940 Btrfs: deal with ... |
2015 2016 |
u64 start = eb->start; unsigned long i, num_pages = num_extent_pages(eb->start, eb->len); |
d95603b26 Btrfs: fix uninit... |
2017 |
int ret = 0; |
ea4667940 Btrfs: deal with ... |
2018 |
|
908960c6c Btrfs: disable on... |
2019 2020 |
if (root->fs_info->sb->s_flags & MS_RDONLY) return -EROFS; |
ea4667940 Btrfs: deal with ... |
2021 |
for (i = 0; i < num_pages; i++) { |
fb85fc9a6 btrfs: kill exten... |
2022 |
struct page *p = eb->pages[i]; |
1203b6813 Btrfs: modify cle... |
2023 2024 2025 2026 |
ret = repair_io_failure(root->fs_info->btree_inode, start, PAGE_CACHE_SIZE, start, p, start - page_offset(p), mirror_num); |
ea4667940 Btrfs: deal with ... |
2027 2028 2029 2030 2031 2032 2033 |
if (ret) break; start += PAGE_CACHE_SIZE; } return ret; } |
4a54c8c16 btrfs: Moved repa... |
2034 2035 2036 2037 |
/* * each time an IO finishes, we do a fast check in the IO failure tree * to see if we need to process or clean up an io_failure_record */ |
8b110e393 Btrfs: implement ... |
2038 2039 |
int clean_io_failure(struct inode *inode, u64 start, struct page *page, unsigned int pg_offset) |
4a54c8c16 btrfs: Moved repa... |
2040 2041 2042 2043 |
{ u64 private; u64 private_failure; struct io_failure_record *failrec; |
908960c6c Btrfs: disable on... |
2044 |
struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; |
4a54c8c16 btrfs: Moved repa... |
2045 2046 |
struct extent_state *state; int num_copies; |
4a54c8c16 btrfs: Moved repa... |
2047 |
int ret; |
4a54c8c16 btrfs: Moved repa... |
2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 2063 2064 2065 2066 2067 |
private = 0; ret = count_range_bits(&BTRFS_I(inode)->io_failure_tree, &private, (u64)-1, 1, EXTENT_DIRTY, 0); if (!ret) return 0; ret = get_state_private(&BTRFS_I(inode)->io_failure_tree, start, &private_failure); if (ret) return 0; failrec = (struct io_failure_record *)(unsigned long) private_failure; BUG_ON(!failrec->this_mirror); if (failrec->in_validation) { /* there was no real error, just free the record */ pr_debug("clean_io_failure: freeing dummy error at %llu ", failrec->start); |
4a54c8c16 btrfs: Moved repa... |
2068 2069 |
goto out; } |
908960c6c Btrfs: disable on... |
2070 2071 |
if (fs_info->sb->s_flags & MS_RDONLY) goto out; |
4a54c8c16 btrfs: Moved repa... |
2072 2073 2074 2075 2076 2077 |
spin_lock(&BTRFS_I(inode)->io_tree.lock); state = find_first_extent_bit_state(&BTRFS_I(inode)->io_tree, failrec->start, EXTENT_LOCKED); spin_unlock(&BTRFS_I(inode)->io_tree.lock); |
883d0de48 Btrfs: batch the ... |
2078 2079 |
if (state && state->start <= failrec->start && state->end >= failrec->start + failrec->len - 1) { |
3ec706c83 Btrfs: pass fs_in... |
2080 2081 |
num_copies = btrfs_num_copies(fs_info, failrec->logical, failrec->len); |
4a54c8c16 btrfs: Moved repa... |
2082 |
if (num_copies > 1) { |
1203b6813 Btrfs: modify cle... |
2083 |
repair_io_failure(inode, start, failrec->len, |
454ff3de4 Btrfs: Cleanup un... |
2084 |
failrec->logical, page, |
1203b6813 Btrfs: modify cle... |
2085 |
pg_offset, failrec->failed_mirror); |
4a54c8c16 btrfs: Moved repa... |
2086 2087 2088 2089 |
} } out: |
454ff3de4 Btrfs: Cleanup un... |
2090 |
free_io_failure(inode, failrec); |
4a54c8c16 btrfs: Moved repa... |
2091 |
|
454ff3de4 Btrfs: Cleanup un... |
2092 |
return 0; |
4a54c8c16 btrfs: Moved repa... |
2093 |
} |
f612496bc Btrfs: cleanup th... |
2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 |
/* * Can be called when * - hold extent lock * - under ordered extent * - the inode is freeing */ void btrfs_free_io_failure_record(struct inode *inode, u64 start, u64 end) { struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree; struct io_failure_record *failrec; struct extent_state *state, *next; if (RB_EMPTY_ROOT(&failure_tree->state)) return; spin_lock(&failure_tree->lock); state = find_first_extent_bit_state(failure_tree, start, EXTENT_DIRTY); while (state) { if (state->start > end) break; ASSERT(state->end <= end); next = next_state(state); failrec = (struct io_failure_record *)state->private; free_extent_state(state); kfree(failrec); state = next; } spin_unlock(&failure_tree->lock); } |
2fe6303e7 Btrfs: split bio_... |
2127 2128 |
int btrfs_get_io_failure_record(struct inode *inode, u64 start, u64 end, struct io_failure_record **failrec_ret) |
4a54c8c16 btrfs: Moved repa... |
2129 |
{ |
2fe6303e7 Btrfs: split bio_... |
2130 |
struct io_failure_record *failrec; |
4a54c8c16 btrfs: Moved repa... |
2131 2132 |
u64 private; struct extent_map *em; |
4a54c8c16 btrfs: Moved repa... |
2133 2134 2135 |
struct extent_io_tree *failure_tree = &BTRFS_I(inode)->io_failure_tree; struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; struct extent_map_tree *em_tree = &BTRFS_I(inode)->extent_tree; |
4a54c8c16 btrfs: Moved repa... |
2136 |
int ret; |
4a54c8c16 btrfs: Moved repa... |
2137 |
u64 logical; |
4a54c8c16 btrfs: Moved repa... |
2138 2139 2140 2141 2142 |
ret = get_state_private(failure_tree, start, &private); if (ret) { failrec = kzalloc(sizeof(*failrec), GFP_NOFS); if (!failrec) return -ENOMEM; |
2fe6303e7 Btrfs: split bio_... |
2143 |
|
4a54c8c16 btrfs: Moved repa... |
2144 2145 2146 2147 2148 2149 2150 2151 2152 2153 2154 2155 2156 |
failrec->start = start; failrec->len = end - start + 1; failrec->this_mirror = 0; failrec->bio_flags = 0; failrec->in_validation = 0; read_lock(&em_tree->lock); em = lookup_extent_mapping(em_tree, start, failrec->len); if (!em) { read_unlock(&em_tree->lock); kfree(failrec); return -EIO; } |
68ba990f7 Btrfs: fix extent... |
2157 |
if (em->start > start || em->start + em->len <= start) { |
4a54c8c16 btrfs: Moved repa... |
2158 2159 2160 2161 |
free_extent_map(em); em = NULL; } read_unlock(&em_tree->lock); |
7a2d6a646 Btrfs: remove unn... |
2162 |
if (!em) { |
4a54c8c16 btrfs: Moved repa... |
2163 2164 2165 |
kfree(failrec); return -EIO; } |
2fe6303e7 Btrfs: split bio_... |
2166 |
|
4a54c8c16 btrfs: Moved repa... |
2167 2168 2169 2170 2171 2172 2173 2174 |
logical = start - em->start; logical = em->block_start + logical; if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) { logical = em->block_start; failrec->bio_flags = EXTENT_BIO_COMPRESSED; extent_set_compress_type(&failrec->bio_flags, em->compress_type); } |
2fe6303e7 Btrfs: split bio_... |
2175 2176 2177 2178 |
pr_debug("Get IO Failure Record: (new) logical=%llu, start=%llu, len=%llu ", logical, start, failrec->len); |
4a54c8c16 btrfs: Moved repa... |
2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 2194 2195 2196 2197 |
failrec->logical = logical; free_extent_map(em); /* set the bits in the private failure tree */ ret = set_extent_bits(failure_tree, start, end, EXTENT_LOCKED | EXTENT_DIRTY, GFP_NOFS); if (ret >= 0) ret = set_state_private(failure_tree, start, (u64)(unsigned long)failrec); /* set the bits in the inode's tree */ if (ret >= 0) ret = set_extent_bits(tree, start, end, EXTENT_DAMAGED, GFP_NOFS); if (ret < 0) { kfree(failrec); return ret; } } else { failrec = (struct io_failure_record *)(unsigned long)private; |
2fe6303e7 Btrfs: split bio_... |
2198 2199 |
pr_debug("Get IO Failure Record: (found) logical=%llu, start=%llu, len=%llu, validation=%d ", |
4a54c8c16 btrfs: Moved repa... |
2200 2201 2202 2203 2204 2205 2206 2207 |
failrec->logical, failrec->start, failrec->len, failrec->in_validation); /* * when data can be on disk more than twice, add to failrec here * (e.g. with a list for failed_mirror) to make * clean_io_failure() clean all those errors at once. */ } |
2fe6303e7 Btrfs: split bio_... |
2208 2209 2210 2211 2212 2213 2214 2215 2216 2217 |
*failrec_ret = failrec; return 0; } int btrfs_check_repairable(struct inode *inode, struct bio *failed_bio, struct io_failure_record *failrec, int failed_mirror) { int num_copies; |
5d9640517 Btrfs: Pass fs_in... |
2218 2219 |
num_copies = btrfs_num_copies(BTRFS_I(inode)->root->fs_info, failrec->logical, failrec->len); |
4a54c8c16 btrfs: Moved repa... |
2220 2221 2222 2223 2224 2225 |
if (num_copies == 1) { /* * we only have a single copy of the data, so don't bother with * all the retry and error correction code that follows. no * matter what the error is, it is very likely to persist. */ |
2fe6303e7 Btrfs: split bio_... |
2226 2227 |
pr_debug("Check Repairable: cannot repair, num_copies=%d, next_mirror %d, failed_mirror %d ", |
09a7f7a28 Btrfs: remove unn... |
2228 |
num_copies, failrec->this_mirror, failed_mirror); |
2fe6303e7 Btrfs: split bio_... |
2229 |
return 0; |
4a54c8c16 btrfs: Moved repa... |
2230 |
} |
4a54c8c16 btrfs: Moved repa... |
2231 2232 2233 2234 2235 2236 2237 2238 2239 2240 2241 2242 2243 2244 2245 2246 2247 |
/* * there are two premises: * a) deliver good data to the caller * b) correct the bad sectors on disk */ if (failed_bio->bi_vcnt > 1) { /* * to fulfill b), we need to know the exact failing sectors, as * we don't want to rewrite any more than the failed ones. thus, * we need separate read requests for the failed bio * * if the following BUG_ON triggers, our validation request got * merged. we need separate requests for our algorithm to work. */ BUG_ON(failrec->in_validation); failrec->in_validation = 1; failrec->this_mirror = failed_mirror; |
4a54c8c16 btrfs: Moved repa... |
2248 2249 2250 2251 2252 2253 2254 2255 2256 2257 2258 2259 2260 2261 2262 |
} else { /* * we're ready to fulfill a) and b) alongside. get a good copy * of the failed sector and if we succeed, we have setup * everything for repair_io_failure to do the rest for us. */ if (failrec->in_validation) { BUG_ON(failrec->this_mirror != failed_mirror); failrec->in_validation = 0; failrec->this_mirror = 0; } failrec->failed_mirror = failed_mirror; failrec->this_mirror++; if (failrec->this_mirror == failed_mirror) failrec->this_mirror++; |
4a54c8c16 btrfs: Moved repa... |
2263 |
} |
facc8a224 Btrfs: don't cach... |
2264 |
if (failrec->this_mirror > num_copies) { |
2fe6303e7 Btrfs: split bio_... |
2265 2266 |
pr_debug("Check Repairable: (fail) num_copies=%d, next_mirror %d, failed_mirror %d ", |
4a54c8c16 btrfs: Moved repa... |
2267 |
num_copies, failrec->this_mirror, failed_mirror); |
2fe6303e7 Btrfs: split bio_... |
2268 |
return 0; |
4a54c8c16 btrfs: Moved repa... |
2269 |
} |
2fe6303e7 Btrfs: split bio_... |
2270 2271 2272 2273 2274 2275 2276 |
return 1; } struct bio *btrfs_create_repair_bio(struct inode *inode, struct bio *failed_bio, struct io_failure_record *failrec, struct page *page, int pg_offset, int icsum, |
8b110e393 Btrfs: implement ... |
2277 |
bio_end_io_t *endio_func, void *data) |
2fe6303e7 Btrfs: split bio_... |
2278 2279 2280 2281 |
{ struct bio *bio; struct btrfs_io_bio *btrfs_failed_bio; struct btrfs_io_bio *btrfs_bio; |
9be3395bc Btrfs: use a btrf... |
2282 |
bio = btrfs_io_bio_alloc(GFP_NOFS, 1); |
2fe6303e7 Btrfs: split bio_... |
2283 2284 2285 2286 |
if (!bio) return NULL; bio->bi_end_io = endio_func; |
4f024f379 block: Abstract o... |
2287 |
bio->bi_iter.bi_sector = failrec->logical >> 9; |
4a54c8c16 btrfs: Moved repa... |
2288 |
bio->bi_bdev = BTRFS_I(inode)->root->fs_info->fs_devices->latest_bdev; |
4f024f379 block: Abstract o... |
2289 |
bio->bi_iter.bi_size = 0; |
8b110e393 Btrfs: implement ... |
2290 |
bio->bi_private = data; |
4a54c8c16 btrfs: Moved repa... |
2291 |
|
facc8a224 Btrfs: don't cach... |
2292 2293 2294 2295 2296 2297 2298 |
btrfs_failed_bio = btrfs_io_bio(failed_bio); if (btrfs_failed_bio->csum) { struct btrfs_fs_info *fs_info = BTRFS_I(inode)->root->fs_info; u16 csum_size = btrfs_super_csum_size(fs_info->super_copy); btrfs_bio = btrfs_io_bio(bio); btrfs_bio->csum = btrfs_bio->csum_inline; |
2fe6303e7 Btrfs: split bio_... |
2299 2300 |
icsum *= csum_size; memcpy(btrfs_bio->csum, btrfs_failed_bio->csum + icsum, |
facc8a224 Btrfs: don't cach... |
2301 2302 |
csum_size); } |
2fe6303e7 Btrfs: split bio_... |
2303 2304 2305 2306 2307 2308 2309 2310 2311 2312 2313 2314 2315 2316 2317 2318 2319 2320 2321 2322 2323 2324 2325 2326 2327 2328 2329 2330 2331 2332 2333 2334 2335 2336 2337 2338 2339 2340 2341 2342 2343 2344 2345 2346 |
bio_add_page(bio, page, failrec->len, pg_offset); return bio; } /* * this is a generic handler for readpage errors (default * readpage_io_failed_hook). if other copies exist, read those and write back * good data to the failed position. does not investigate in remapping the * failed extent elsewhere, hoping the device will be smart enough to do this as * needed */ static int bio_readpage_error(struct bio *failed_bio, u64 phy_offset, struct page *page, u64 start, u64 end, int failed_mirror) { struct io_failure_record *failrec; struct inode *inode = page->mapping->host; struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree; struct bio *bio; int read_mode; int ret; BUG_ON(failed_bio->bi_rw & REQ_WRITE); ret = btrfs_get_io_failure_record(inode, start, end, &failrec); if (ret) return ret; ret = btrfs_check_repairable(inode, failed_bio, failrec, failed_mirror); if (!ret) { free_io_failure(inode, failrec); return -EIO; } if (failed_bio->bi_vcnt > 1) read_mode = READ_SYNC | REQ_FAILFAST_DEV; else read_mode = READ_SYNC; phy_offset >>= inode->i_sb->s_blocksize_bits; bio = btrfs_create_repair_bio(inode, failed_bio, failrec, page, start - page_offset(page), |
8b110e393 Btrfs: implement ... |
2347 2348 |
(int)phy_offset, failed_bio->bi_end_io, NULL); |
2fe6303e7 Btrfs: split bio_... |
2349 2350 2351 2352 |
if (!bio) { free_io_failure(inode, failrec); return -EIO; } |
4a54c8c16 btrfs: Moved repa... |
2353 |
|
2fe6303e7 Btrfs: split bio_... |
2354 2355 2356 |
pr_debug("Repair Read Error: submitting new read[%#x] to this_mirror=%d, in_validation=%d ", read_mode, failrec->this_mirror, failrec->in_validation); |
4a54c8c16 btrfs: Moved repa... |
2357 |
|
013bd4c33 Btrfs: fix return... |
2358 2359 2360 |
ret = tree->ops->submit_bio_hook(inode, read_mode, bio, failrec->this_mirror, failrec->bio_flags, 0); |
6c387ab20 Btrfs: fix missin... |
2361 |
if (ret) { |
454ff3de4 Btrfs: Cleanup un... |
2362 |
free_io_failure(inode, failrec); |
6c387ab20 Btrfs: fix missin... |
2363 2364 |
bio_put(bio); } |
013bd4c33 Btrfs: fix return... |
2365 |
return ret; |
4a54c8c16 btrfs: Moved repa... |
2366 |
} |
d1310b2e0 Btrfs: Split the ... |
2367 |
/* lots and lots of room for performance fixes in the end_bio funcs */ |
87826df0e btrfs: delalloc f... |
2368 2369 2370 2371 |
int end_extent_writepage(struct page *page, int err, u64 start, u64 end) { int uptodate = (err == 0); struct extent_io_tree *tree; |
3e2426bd0 btrfs: fix use of... |
2372 |
int ret = 0; |
87826df0e btrfs: delalloc f... |
2373 2374 2375 2376 2377 2378 2379 2380 2381 |
tree = &BTRFS_I(page->mapping->host)->io_tree; if (tree->ops && tree->ops->writepage_end_io_hook) { ret = tree->ops->writepage_end_io_hook(page, start, end, NULL, uptodate); if (ret) uptodate = 0; } |
87826df0e btrfs: delalloc f... |
2382 |
if (!uptodate) { |
87826df0e btrfs: delalloc f... |
2383 2384 |
ClearPageUptodate(page); SetPageError(page); |
5dca6eea9 Btrfs: mark mappi... |
2385 2386 |
ret = ret < 0 ? ret : -EIO; mapping_set_error(page->mapping, ret); |
87826df0e btrfs: delalloc f... |
2387 2388 2389 |
} return 0; } |
d1310b2e0 Btrfs: Split the ... |
2390 2391 2392 2393 2394 2395 2396 2397 2398 |
/* * after a writepage IO is done, we need to: * clear the uptodate bits on error * clear the writeback bits in the extent tree for this IO * end_page_writeback if the page has no more pending IO * * Scheduling is not allowed, so the extent state tree is expected * to have one and only one object corresponding to this IO. */ |
d1310b2e0 Btrfs: Split the ... |
2399 |
static void end_bio_extent_writepage(struct bio *bio, int err) |
d1310b2e0 Btrfs: Split the ... |
2400 |
{ |
2c30c71bd block: Convert va... |
2401 |
struct bio_vec *bvec; |
d1310b2e0 Btrfs: Split the ... |
2402 2403 |
u64 start; u64 end; |
2c30c71bd block: Convert va... |
2404 |
int i; |
d1310b2e0 Btrfs: Split the ... |
2405 |
|
2c30c71bd block: Convert va... |
2406 |
bio_for_each_segment_all(bvec, bio, i) { |
d1310b2e0 Btrfs: Split the ... |
2407 |
struct page *page = bvec->bv_page; |
902b22f34 Btrfs: Remove bro... |
2408 |
|
17a5adccf btrfs: do away wi... |
2409 2410 2411 2412 2413 |
/* We always issue full-page reads, but if some block * in a page fails to read, blk_update_request() will * advance bv_offset and adjust bv_len to compensate. * Print a warning for nonzero offsets, and an error * if they don't add up to a full page. */ |
efe120a06 Btrfs: convert pr... |
2414 2415 2416 2417 2418 2419 2420 2421 2422 2423 2424 |
if (bvec->bv_offset || bvec->bv_len != PAGE_CACHE_SIZE) { if (bvec->bv_offset + bvec->bv_len != PAGE_CACHE_SIZE) btrfs_err(BTRFS_I(page->mapping->host)->root->fs_info, "partial page write in btrfs with offset %u and length %u", bvec->bv_offset, bvec->bv_len); else btrfs_info(BTRFS_I(page->mapping->host)->root->fs_info, "incomplete page write in btrfs with offset %u and " "length %u", bvec->bv_offset, bvec->bv_len); } |
d1310b2e0 Btrfs: Split the ... |
2425 |
|
17a5adccf btrfs: do away wi... |
2426 2427 |
start = page_offset(page); end = start + bvec->bv_offset + bvec->bv_len - 1; |
d1310b2e0 Btrfs: Split the ... |
2428 |
|
87826df0e btrfs: delalloc f... |
2429 2430 |
if (end_extent_writepage(page, err, start, end)) continue; |
70dec8079 Btrfs: extent_io ... |
2431 |
|
17a5adccf btrfs: do away wi... |
2432 |
end_page_writeback(page); |
2c30c71bd block: Convert va... |
2433 |
} |
2b1f55b0f Remove Btrfs comp... |
2434 |
|
d1310b2e0 Btrfs: Split the ... |
2435 |
bio_put(bio); |
d1310b2e0 Btrfs: Split the ... |
2436 |
} |
883d0de48 Btrfs: batch the ... |
2437 2438 2439 2440 2441 2442 2443 2444 2445 2446 2447 |
static void endio_readpage_release_extent(struct extent_io_tree *tree, u64 start, u64 len, int uptodate) { struct extent_state *cached = NULL; u64 end = start + len - 1; if (uptodate && tree->track_uptodate) set_extent_uptodate(tree, start, end, &cached, GFP_ATOMIC); unlock_extent_cached(tree, start, end, &cached, GFP_ATOMIC); } |
d1310b2e0 Btrfs: Split the ... |
2448 2449 2450 2451 2452 2453 2454 2455 2456 2457 2458 |
/* * after a readpage IO is done, we need to: * clear the uptodate bits on error * set the uptodate bits if things worked * set the page up to date if all extents in the tree are uptodate * clear the lock bit in the extent tree * unlock the page if there are no other extents locked for it * * Scheduling is not allowed, so the extent state tree is expected * to have one and only one object corresponding to this IO. */ |
d1310b2e0 Btrfs: Split the ... |
2459 |
static void end_bio_extent_readpage(struct bio *bio, int err) |
d1310b2e0 Btrfs: Split the ... |
2460 |
{ |
2c30c71bd block: Convert va... |
2461 |
struct bio_vec *bvec; |
d1310b2e0 Btrfs: Split the ... |
2462 |
int uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); |
facc8a224 Btrfs: don't cach... |
2463 |
struct btrfs_io_bio *io_bio = btrfs_io_bio(bio); |
902b22f34 Btrfs: Remove bro... |
2464 |
struct extent_io_tree *tree; |
facc8a224 Btrfs: don't cach... |
2465 |
u64 offset = 0; |
d1310b2e0 Btrfs: Split the ... |
2466 2467 |
u64 start; u64 end; |
facc8a224 Btrfs: don't cach... |
2468 |
u64 len; |
883d0de48 Btrfs: batch the ... |
2469 2470 |
u64 extent_start = 0; u64 extent_len = 0; |
5cf1ab561 Btrfs: always sto... |
2471 |
int mirror; |
d1310b2e0 Btrfs: Split the ... |
2472 |
int ret; |
2c30c71bd block: Convert va... |
2473 |
int i; |
d1310b2e0 Btrfs: Split the ... |
2474 |
|
d20f7043f Btrfs: move data ... |
2475 2476 |
if (err) uptodate = 0; |
2c30c71bd block: Convert va... |
2477 |
bio_for_each_segment_all(bvec, bio, i) { |
d1310b2e0 Btrfs: Split the ... |
2478 |
struct page *page = bvec->bv_page; |
a71754fc6 Btrfs: move btrfs... |
2479 |
struct inode *inode = page->mapping->host; |
507903b81 btrfs: using cach... |
2480 |
|
be3940c0a btrfs: Kill some ... |
2481 |
pr_debug("end_bio_extent_readpage: bi_sector=%llu, err=%d, " |
c1dc08967 Btrfs: do file da... |
2482 2483 |
"mirror=%u ", (u64)bio->bi_iter.bi_sector, err, |
9be3395bc Btrfs: use a btrf... |
2484 |
io_bio->mirror_num); |
a71754fc6 Btrfs: move btrfs... |
2485 |
tree = &BTRFS_I(inode)->io_tree; |
902b22f34 Btrfs: Remove bro... |
2486 |
|
17a5adccf btrfs: do away wi... |
2487 2488 2489 2490 2491 |
/* We always issue full-page reads, but if some block * in a page fails to read, blk_update_request() will * advance bv_offset and adjust bv_len to compensate. * Print a warning for nonzero offsets, and an error * if they don't add up to a full page. */ |
efe120a06 Btrfs: convert pr... |
2492 2493 2494 2495 2496 2497 2498 2499 2500 2501 2502 |
if (bvec->bv_offset || bvec->bv_len != PAGE_CACHE_SIZE) { if (bvec->bv_offset + bvec->bv_len != PAGE_CACHE_SIZE) btrfs_err(BTRFS_I(page->mapping->host)->root->fs_info, "partial page read in btrfs with offset %u and length %u", bvec->bv_offset, bvec->bv_len); else btrfs_info(BTRFS_I(page->mapping->host)->root->fs_info, "incomplete page read in btrfs with offset %u and " "length %u", bvec->bv_offset, bvec->bv_len); } |
d1310b2e0 Btrfs: Split the ... |
2503 |
|
17a5adccf btrfs: do away wi... |
2504 2505 |
start = page_offset(page); end = start + bvec->bv_offset + bvec->bv_len - 1; |
facc8a224 Btrfs: don't cach... |
2506 |
len = bvec->bv_len; |
d1310b2e0 Btrfs: Split the ... |
2507 |
|
9be3395bc Btrfs: use a btrf... |
2508 |
mirror = io_bio->mirror_num; |
f2a09da9d Btrfs: add branch... |
2509 2510 |
if (likely(uptodate && tree->ops && tree->ops->readpage_end_io_hook)) { |
facc8a224 Btrfs: don't cach... |
2511 2512 2513 |
ret = tree->ops->readpage_end_io_hook(io_bio, offset, page, start, end, mirror); |
5ee0844d6 Btrfs: revert che... |
2514 |
if (ret) |
d1310b2e0 Btrfs: Split the ... |
2515 |
uptodate = 0; |
5ee0844d6 Btrfs: revert che... |
2516 |
else |
1203b6813 Btrfs: modify cle... |
2517 |
clean_io_failure(inode, start, page, 0); |
d1310b2e0 Btrfs: Split the ... |
2518 |
} |
ea4667940 Btrfs: deal with ... |
2519 |
|
f2a09da9d Btrfs: add branch... |
2520 2521 2522 2523 |
if (likely(uptodate)) goto readpage_ok; if (tree->ops && tree->ops->readpage_io_failed_hook) { |
5cf1ab561 Btrfs: always sto... |
2524 |
ret = tree->ops->readpage_io_failed_hook(page, mirror); |
ea4667940 Btrfs: deal with ... |
2525 2526 2527 |
if (!ret && !err && test_bit(BIO_UPTODATE, &bio->bi_flags)) uptodate = 1; |
f2a09da9d Btrfs: add branch... |
2528 |
} else { |
f4a8e6563 Btrfs: fix meta d... |
2529 2530 2531 2532 2533 2534 2535 2536 2537 2538 |
/* * The generic bio_readpage_error handles errors the * following way: If possible, new read requests are * created and submitted and will end up in * end_bio_extent_readpage as well (if we're lucky, not * in the !uptodate case). In that case it returns 0 and * we just go on with the next page in our bio. If it * can't handle the error it will return -EIO and we * remain responsible for that page. */ |
facc8a224 Btrfs: don't cach... |
2539 2540 |
ret = bio_readpage_error(bio, offset, page, start, end, mirror); |
7e38326f5 Btrfs: Handle che... |
2541 |
if (ret == 0) { |
3b951516e Btrfs: Use the ex... |
2542 2543 |
uptodate = test_bit(BIO_UPTODATE, &bio->bi_flags); |
d20f7043f Btrfs: move data ... |
2544 2545 |
if (err) uptodate = 0; |
38c1c2e44 Btrfs: fix crash ... |
2546 |
offset += len; |
7e38326f5 Btrfs: Handle che... |
2547 2548 2549 |
continue; } } |
f2a09da9d Btrfs: add branch... |
2550 |
readpage_ok: |
883d0de48 Btrfs: batch the ... |
2551 |
if (likely(uptodate)) { |
a71754fc6 Btrfs: move btrfs... |
2552 2553 |
loff_t i_size = i_size_read(inode); pgoff_t end_index = i_size >> PAGE_CACHE_SHIFT; |
a583c0266 Btrfs: cleanup th... |
2554 |
unsigned off; |
a71754fc6 Btrfs: move btrfs... |
2555 2556 |
/* Zero out the end if this page straddles i_size */ |
a583c0266 Btrfs: cleanup th... |
2557 2558 2559 |
off = i_size & (PAGE_CACHE_SIZE-1); if (page->index == end_index && off) zero_user_segment(page, off, PAGE_CACHE_SIZE); |
17a5adccf btrfs: do away wi... |
2560 |
SetPageUptodate(page); |
70dec8079 Btrfs: extent_io ... |
2561 |
} else { |
17a5adccf btrfs: do away wi... |
2562 2563 |
ClearPageUptodate(page); SetPageError(page); |
70dec8079 Btrfs: extent_io ... |
2564 |
} |
17a5adccf btrfs: do away wi... |
2565 |
unlock_page(page); |
facc8a224 Btrfs: don't cach... |
2566 |
offset += len; |
883d0de48 Btrfs: batch the ... |
2567 2568 2569 2570 2571 2572 2573 2574 2575 2576 2577 2578 2579 2580 2581 2582 2583 2584 2585 2586 2587 2588 |
if (unlikely(!uptodate)) { if (extent_len) { endio_readpage_release_extent(tree, extent_start, extent_len, 1); extent_start = 0; extent_len = 0; } endio_readpage_release_extent(tree, start, end - start + 1, 0); } else if (!extent_len) { extent_start = start; extent_len = end + 1 - start; } else if (extent_start + extent_len == start) { extent_len += end + 1 - start; } else { endio_readpage_release_extent(tree, extent_start, extent_len, uptodate); extent_start = start; extent_len = end + 1 - start; } |
2c30c71bd block: Convert va... |
2589 |
} |
d1310b2e0 Btrfs: Split the ... |
2590 |
|
883d0de48 Btrfs: batch the ... |
2591 2592 2593 |
if (extent_len) endio_readpage_release_extent(tree, extent_start, extent_len, uptodate); |
facc8a224 Btrfs: don't cach... |
2594 2595 |
if (io_bio->end_io) io_bio->end_io(io_bio, err); |
d1310b2e0 Btrfs: Split the ... |
2596 |
bio_put(bio); |
d1310b2e0 Btrfs: Split the ... |
2597 |
} |
9be3395bc Btrfs: use a btrf... |
2598 2599 2600 2601 |
/* * this allocates from the btrfs_bioset. We're returning a bio right now * but you can call btrfs_io_bio for the appropriate container_of magic */ |
88f794ede btrfs: cleanup du... |
2602 2603 2604 |
struct bio * btrfs_bio_alloc(struct block_device *bdev, u64 first_sector, int nr_vecs, gfp_t gfp_flags) |
d1310b2e0 Btrfs: Split the ... |
2605 |
{ |
facc8a224 Btrfs: don't cach... |
2606 |
struct btrfs_io_bio *btrfs_bio; |
d1310b2e0 Btrfs: Split the ... |
2607 |
struct bio *bio; |
9be3395bc Btrfs: use a btrf... |
2608 |
bio = bio_alloc_bioset(gfp_flags, nr_vecs, btrfs_bioset); |
d1310b2e0 Btrfs: Split the ... |
2609 2610 |
if (bio == NULL && (current->flags & PF_MEMALLOC)) { |
9be3395bc Btrfs: use a btrf... |
2611 2612 2613 2614 |
while (!bio && (nr_vecs /= 2)) { bio = bio_alloc_bioset(gfp_flags, nr_vecs, btrfs_bioset); } |
d1310b2e0 Btrfs: Split the ... |
2615 2616 2617 2618 |
} if (bio) { bio->bi_bdev = bdev; |
4f024f379 block: Abstract o... |
2619 |
bio->bi_iter.bi_sector = first_sector; |
facc8a224 Btrfs: don't cach... |
2620 2621 2622 2623 |
btrfs_bio = btrfs_io_bio(bio); btrfs_bio->csum = NULL; btrfs_bio->csum_allocated = NULL; btrfs_bio->end_io = NULL; |
d1310b2e0 Btrfs: Split the ... |
2624 2625 2626 |
} return bio; } |
9be3395bc Btrfs: use a btrf... |
2627 2628 |
struct bio *btrfs_bio_clone(struct bio *bio, gfp_t gfp_mask) { |
23ea8e5a0 Btrfs: load check... |
2629 2630 |
struct btrfs_io_bio *btrfs_bio; struct bio *new; |
9be3395bc Btrfs: use a btrf... |
2631 |
|
23ea8e5a0 Btrfs: load check... |
2632 2633 2634 2635 2636 2637 2638 2639 2640 |
new = bio_clone_bioset(bio, gfp_mask, btrfs_bioset); if (new) { btrfs_bio = btrfs_io_bio(new); btrfs_bio->csum = NULL; btrfs_bio->csum_allocated = NULL; btrfs_bio->end_io = NULL; } return new; } |
9be3395bc Btrfs: use a btrf... |
2641 2642 2643 2644 |
/* this also allocates from the btrfs_bioset */ struct bio *btrfs_io_bio_alloc(gfp_t gfp_mask, unsigned int nr_iovecs) { |
facc8a224 Btrfs: don't cach... |
2645 2646 2647 2648 2649 2650 2651 2652 2653 2654 2655 |
struct btrfs_io_bio *btrfs_bio; struct bio *bio; bio = bio_alloc_bioset(gfp_mask, nr_iovecs, btrfs_bioset); if (bio) { btrfs_bio = btrfs_io_bio(bio); btrfs_bio->csum = NULL; btrfs_bio->csum_allocated = NULL; btrfs_bio->end_io = NULL; } return bio; |
9be3395bc Btrfs: use a btrf... |
2656 |
} |
355808c29 btrfs: ->submit_b... |
2657 2658 |
static int __must_check submit_one_bio(int rw, struct bio *bio, int mirror_num, unsigned long bio_flags) |
d1310b2e0 Btrfs: Split the ... |
2659 |
{ |
d1310b2e0 Btrfs: Split the ... |
2660 |
int ret = 0; |
70dec8079 Btrfs: extent_io ... |
2661 2662 2663 |
struct bio_vec *bvec = bio->bi_io_vec + bio->bi_vcnt - 1; struct page *page = bvec->bv_page; struct extent_io_tree *tree = bio->bi_private; |
70dec8079 Btrfs: extent_io ... |
2664 |
u64 start; |
70dec8079 Btrfs: extent_io ... |
2665 |
|
4eee4fa4f Btrfs: use wrappe... |
2666 |
start = page_offset(page) + bvec->bv_offset; |
70dec8079 Btrfs: extent_io ... |
2667 |
|
902b22f34 Btrfs: Remove bro... |
2668 |
bio->bi_private = NULL; |
d1310b2e0 Btrfs: Split the ... |
2669 2670 |
bio_get(bio); |
065631f6d Btrfs: checksum f... |
2671 |
if (tree->ops && tree->ops->submit_bio_hook) |
6b82ce8d8 btrfs: fix unchec... |
2672 |
ret = tree->ops->submit_bio_hook(page->mapping->host, rw, bio, |
eaf25d933 Btrfs: use async ... |
2673 |
mirror_num, bio_flags, start); |
0b86a832a Btrfs: Add suppor... |
2674 |
else |
21adbd5cb Btrfs: integrate ... |
2675 |
btrfsic_submit_bio(rw, bio); |
4a54c8c16 btrfs: Moved repa... |
2676 |
|
d1310b2e0 Btrfs: Split the ... |
2677 2678 2679 2680 2681 |
if (bio_flagged(bio, BIO_EOPNOTSUPP)) ret = -EOPNOTSUPP; bio_put(bio); return ret; } |
64a167011 Btrfs: add rw arg... |
2682 |
static int merge_bio(int rw, struct extent_io_tree *tree, struct page *page, |
3444a9725 btrfs: Factor out... |
2683 2684 2685 2686 2687 |
unsigned long offset, size_t size, struct bio *bio, unsigned long bio_flags) { int ret = 0; if (tree->ops && tree->ops->merge_bio_hook) |
64a167011 Btrfs: add rw arg... |
2688 |
ret = tree->ops->merge_bio_hook(rw, page, offset, size, bio, |
3444a9725 btrfs: Factor out... |
2689 2690 2691 2692 2693 |
bio_flags); BUG_ON(ret < 0); return ret; } |
d1310b2e0 Btrfs: Split the ... |
2694 2695 2696 2697 2698 2699 |
static int submit_extent_page(int rw, struct extent_io_tree *tree, struct page *page, sector_t sector, size_t size, unsigned long offset, struct block_device *bdev, struct bio **bio_ret, unsigned long max_pages, |
f188591e9 Btrfs: Retry meta... |
2700 |
bio_end_io_t end_io_func, |
c8b978188 Btrfs: Add zlib c... |
2701 2702 2703 |
int mirror_num, unsigned long prev_bio_flags, unsigned long bio_flags) |
d1310b2e0 Btrfs: Split the ... |
2704 2705 2706 2707 |
{ int ret = 0; struct bio *bio; int nr; |
c8b978188 Btrfs: Add zlib c... |
2708 2709 2710 |
int contig = 0; int this_compressed = bio_flags & EXTENT_BIO_COMPRESSED; int old_compressed = prev_bio_flags & EXTENT_BIO_COMPRESSED; |
5b050f04c Btrfs: Fix compil... |
2711 |
size_t page_size = min_t(size_t, size, PAGE_CACHE_SIZE); |
d1310b2e0 Btrfs: Split the ... |
2712 2713 2714 |
if (bio_ret && *bio_ret) { bio = *bio_ret; |
c8b978188 Btrfs: Add zlib c... |
2715 |
if (old_compressed) |
4f024f379 block: Abstract o... |
2716 |
contig = bio->bi_iter.bi_sector == sector; |
c8b978188 Btrfs: Add zlib c... |
2717 |
else |
f73a1c7d1 block: Add bio_en... |
2718 |
contig = bio_end_sector(bio) == sector; |
c8b978188 Btrfs: Add zlib c... |
2719 2720 |
if (prev_bio_flags != bio_flags || !contig || |
64a167011 Btrfs: add rw arg... |
2721 |
merge_bio(rw, tree, page, offset, page_size, bio, bio_flags) || |
c8b978188 Btrfs: Add zlib c... |
2722 2723 2724 |
bio_add_page(bio, page, page_size, offset) < page_size) { ret = submit_one_bio(rw, bio, mirror_num, prev_bio_flags); |
79787eaab btrfs: replace ma... |
2725 2726 |
if (ret < 0) return ret; |
d1310b2e0 Btrfs: Split the ... |
2727 2728 2729 2730 2731 |
bio = NULL; } else { return 0; } } |
c8b978188 Btrfs: Add zlib c... |
2732 2733 2734 2735 |
if (this_compressed) nr = BIO_MAX_PAGES; else nr = bio_get_nr_vecs(bdev); |
88f794ede btrfs: cleanup du... |
2736 |
bio = btrfs_bio_alloc(bdev, sector, nr, GFP_NOFS | __GFP_HIGH); |
5df670834 btrfs: checking N... |
2737 2738 |
if (!bio) return -ENOMEM; |
70dec8079 Btrfs: extent_io ... |
2739 |
|
c8b978188 Btrfs: Add zlib c... |
2740 |
bio_add_page(bio, page, page_size, offset); |
d1310b2e0 Btrfs: Split the ... |
2741 2742 |
bio->bi_end_io = end_io_func; bio->bi_private = tree; |
70dec8079 Btrfs: extent_io ... |
2743 |
|
d397712bc Btrfs: Fix checkp... |
2744 |
if (bio_ret) |
d1310b2e0 Btrfs: Split the ... |
2745 |
*bio_ret = bio; |
d397712bc Btrfs: Fix checkp... |
2746 |
else |
c8b978188 Btrfs: Add zlib c... |
2747 |
ret = submit_one_bio(rw, bio, mirror_num, bio_flags); |
d1310b2e0 Btrfs: Split the ... |
2748 2749 2750 |
return ret; } |
48a3b6366 btrfs: make stati... |
2751 2752 |
static void attach_extent_buffer_page(struct extent_buffer *eb, struct page *page) |
d1310b2e0 Btrfs: Split the ... |
2753 2754 2755 |
{ if (!PagePrivate(page)) { SetPagePrivate(page); |
d1310b2e0 Btrfs: Split the ... |
2756 |
page_cache_get(page); |
4f2de97ac Btrfs: set page->... |
2757 2758 2759 |
set_page_private(page, (unsigned long)eb); } else { WARN_ON(page->private != (unsigned long)eb); |
d1310b2e0 Btrfs: Split the ... |
2760 2761 |
} } |
4f2de97ac Btrfs: set page->... |
2762 |
void set_page_extent_mapped(struct page *page) |
d1310b2e0 Btrfs: Split the ... |
2763 |
{ |
4f2de97ac Btrfs: set page->... |
2764 2765 2766 2767 2768 |
if (!PagePrivate(page)) { SetPagePrivate(page); page_cache_get(page); set_page_private(page, EXTENT_PAGE_PRIVATE); } |
d1310b2e0 Btrfs: Split the ... |
2769 |
} |
125bac016 Btrfs: cache the ... |
2770 2771 2772 2773 2774 2775 2776 2777 2778 |
static struct extent_map * __get_extent_map(struct inode *inode, struct page *page, size_t pg_offset, u64 start, u64 len, get_extent_t *get_extent, struct extent_map **em_cached) { struct extent_map *em; if (em_cached && *em_cached) { em = *em_cached; |
cbc0e9287 Btrfs: remove unn... |
2779 |
if (extent_map_in_tree(em) && start >= em->start && |
125bac016 Btrfs: cache the ... |
2780 2781 2782 2783 2784 2785 2786 2787 2788 2789 2790 2791 2792 2793 2794 2795 2796 |
start < extent_map_end(em)) { atomic_inc(&em->refs); return em; } free_extent_map(em); *em_cached = NULL; } em = get_extent(inode, page, pg_offset, start, len, 0); if (em_cached && !IS_ERR_OR_NULL(em)) { BUG_ON(*em_cached); atomic_inc(&em->refs); *em_cached = em; } return em; } |
d1310b2e0 Btrfs: Split the ... |
2797 2798 2799 2800 |
/* * basic readpage implementation. Locked extent state structs are inserted * into the tree that are removed when the IO is done (by the end_io * handlers) |
79787eaab btrfs: replace ma... |
2801 |
* XXX JDM: This needs looking at to ensure proper page locking |
d1310b2e0 Btrfs: Split the ... |
2802 |
*/ |
9974090bd Btrfs: batch the ... |
2803 2804 2805 |
static int __do_readpage(struct extent_io_tree *tree, struct page *page, get_extent_t *get_extent, |
125bac016 Btrfs: cache the ... |
2806 |
struct extent_map **em_cached, |
9974090bd Btrfs: batch the ... |
2807 2808 |
struct bio **bio, int mirror_num, unsigned long *bio_flags, int rw) |
d1310b2e0 Btrfs: Split the ... |
2809 2810 |
{ struct inode *inode = page->mapping->host; |
4eee4fa4f Btrfs: use wrappe... |
2811 |
u64 start = page_offset(page); |
d1310b2e0 Btrfs: Split the ... |
2812 2813 2814 2815 2816 2817 2818 2819 2820 2821 2822 2823 |
u64 page_end = start + PAGE_CACHE_SIZE - 1; u64 end; u64 cur = start; u64 extent_offset; u64 last_byte = i_size_read(inode); u64 block_start; u64 cur_end; sector_t sector; struct extent_map *em; struct block_device *bdev; int ret; int nr = 0; |
4b384318a btrfs: Introduce ... |
2824 |
int parent_locked = *bio_flags & EXTENT_BIO_PARENT_LOCKED; |
306e16ce1 btrfs: rename var... |
2825 |
size_t pg_offset = 0; |
d1310b2e0 Btrfs: Split the ... |
2826 |
size_t iosize; |
c8b978188 Btrfs: Add zlib c... |
2827 |
size_t disk_io_size; |
d1310b2e0 Btrfs: Split the ... |
2828 |
size_t blocksize = inode->i_sb->s_blocksize; |
4b384318a btrfs: Introduce ... |
2829 |
unsigned long this_bio_flag = *bio_flags & EXTENT_BIO_PARENT_LOCKED; |
d1310b2e0 Btrfs: Split the ... |
2830 2831 |
set_page_extent_mapped(page); |
9974090bd Btrfs: batch the ... |
2832 |
end = page_end; |
90a887c9a btrfs: add cleanc... |
2833 2834 2835 |
if (!PageUptodate(page)) { if (cleancache_get_page(page) == 0) { BUG_ON(blocksize != PAGE_SIZE); |
9974090bd Btrfs: batch the ... |
2836 |
unlock_extent(tree, start, end); |
90a887c9a btrfs: add cleanc... |
2837 2838 2839 |
goto out; } } |
c8b978188 Btrfs: Add zlib c... |
2840 2841 2842 2843 2844 2845 |
if (page->index == last_byte >> PAGE_CACHE_SHIFT) { char *userpage; size_t zero_offset = last_byte & (PAGE_CACHE_SIZE - 1); if (zero_offset) { iosize = PAGE_CACHE_SIZE - zero_offset; |
7ac687d9e btrfs: remove the... |
2846 |
userpage = kmap_atomic(page); |
c8b978188 Btrfs: Add zlib c... |
2847 2848 |
memset(userpage + zero_offset, 0, iosize); flush_dcache_page(page); |
7ac687d9e btrfs: remove the... |
2849 |
kunmap_atomic(userpage); |
c8b978188 Btrfs: Add zlib c... |
2850 2851 |
} } |
d1310b2e0 Btrfs: Split the ... |
2852 |
while (cur <= end) { |
c8f2f24bd Btrfs: remove unu... |
2853 |
unsigned long pnr = (last_byte >> PAGE_CACHE_SHIFT) + 1; |
d1310b2e0 Btrfs: Split the ... |
2854 2855 |
if (cur >= last_byte) { char *userpage; |
507903b81 btrfs: using cach... |
2856 |
struct extent_state *cached = NULL; |
306e16ce1 btrfs: rename var... |
2857 |
iosize = PAGE_CACHE_SIZE - pg_offset; |
7ac687d9e btrfs: remove the... |
2858 |
userpage = kmap_atomic(page); |
306e16ce1 btrfs: rename var... |
2859 |
memset(userpage + pg_offset, 0, iosize); |
d1310b2e0 Btrfs: Split the ... |
2860 |
flush_dcache_page(page); |
7ac687d9e btrfs: remove the... |
2861 |
kunmap_atomic(userpage); |
d1310b2e0 Btrfs: Split the ... |
2862 |
set_extent_uptodate(tree, cur, cur + iosize - 1, |
507903b81 btrfs: using cach... |
2863 |
&cached, GFP_NOFS); |
4b384318a btrfs: Introduce ... |
2864 2865 2866 2867 |
if (!parent_locked) unlock_extent_cached(tree, cur, cur + iosize - 1, &cached, GFP_NOFS); |
d1310b2e0 Btrfs: Split the ... |
2868 2869 |
break; } |
125bac016 Btrfs: cache the ... |
2870 2871 |
em = __get_extent_map(inode, page, pg_offset, cur, end - cur + 1, get_extent, em_cached); |
c704005d8 btrfs: unify chec... |
2872 |
if (IS_ERR_OR_NULL(em)) { |
d1310b2e0 Btrfs: Split the ... |
2873 |
SetPageError(page); |
4b384318a btrfs: Introduce ... |
2874 2875 |
if (!parent_locked) unlock_extent(tree, cur, end); |
d1310b2e0 Btrfs: Split the ... |
2876 2877 |
break; } |
d1310b2e0 Btrfs: Split the ... |
2878 2879 2880 |
extent_offset = cur - em->start; BUG_ON(extent_map_end(em) <= cur); BUG_ON(end < cur); |
261507a02 btrfs: Allow to a... |
2881 |
if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) { |
4b384318a btrfs: Introduce ... |
2882 |
this_bio_flag |= EXTENT_BIO_COMPRESSED; |
261507a02 btrfs: Allow to a... |
2883 2884 2885 |
extent_set_compress_type(&this_bio_flag, em->compress_type); } |
c8b978188 Btrfs: Add zlib c... |
2886 |
|
d1310b2e0 Btrfs: Split the ... |
2887 2888 |
iosize = min(extent_map_end(em) - cur, end - cur + 1); cur_end = min(extent_map_end(em) - 1, end); |
fda2832fe btrfs: cleanup fo... |
2889 |
iosize = ALIGN(iosize, blocksize); |
c8b978188 Btrfs: Add zlib c... |
2890 2891 2892 2893 2894 2895 2896 |
if (this_bio_flag & EXTENT_BIO_COMPRESSED) { disk_io_size = em->block_len; sector = em->block_start >> 9; } else { sector = (em->block_start + extent_offset) >> 9; disk_io_size = iosize; } |
d1310b2e0 Btrfs: Split the ... |
2897 2898 |
bdev = em->bdev; block_start = em->block_start; |
d899e0521 Btrfs: Add falloc... |
2899 2900 |
if (test_bit(EXTENT_FLAG_PREALLOC, &em->flags)) block_start = EXTENT_MAP_HOLE; |
d1310b2e0 Btrfs: Split the ... |
2901 2902 2903 2904 2905 2906 |
free_extent_map(em); em = NULL; /* we've found a hole, just zero and go on */ if (block_start == EXTENT_MAP_HOLE) { char *userpage; |
507903b81 btrfs: using cach... |
2907 |
struct extent_state *cached = NULL; |
7ac687d9e btrfs: remove the... |
2908 |
userpage = kmap_atomic(page); |
306e16ce1 btrfs: rename var... |
2909 |
memset(userpage + pg_offset, 0, iosize); |
d1310b2e0 Btrfs: Split the ... |
2910 |
flush_dcache_page(page); |
7ac687d9e btrfs: remove the... |
2911 |
kunmap_atomic(userpage); |
d1310b2e0 Btrfs: Split the ... |
2912 2913 |
set_extent_uptodate(tree, cur, cur + iosize - 1, |
507903b81 btrfs: using cach... |
2914 2915 2916 |
&cached, GFP_NOFS); unlock_extent_cached(tree, cur, cur + iosize - 1, &cached, GFP_NOFS); |
d1310b2e0 Btrfs: Split the ... |
2917 |
cur = cur + iosize; |
306e16ce1 btrfs: rename var... |
2918 |
pg_offset += iosize; |
d1310b2e0 Btrfs: Split the ... |
2919 2920 2921 |
continue; } /* the get_extent function already copied into the page */ |
9655d2982 Btrfs: use a cach... |
2922 2923 |
if (test_range_bit(tree, cur, cur_end, EXTENT_UPTODATE, 1, NULL)) { |
a1b32a593 Btrfs: Add debugg... |
2924 |
check_page_uptodate(tree, page); |
4b384318a btrfs: Introduce ... |
2925 2926 |
if (!parent_locked) unlock_extent(tree, cur, cur + iosize - 1); |
d1310b2e0 Btrfs: Split the ... |
2927 |
cur = cur + iosize; |
306e16ce1 btrfs: rename var... |
2928 |
pg_offset += iosize; |
d1310b2e0 Btrfs: Split the ... |
2929 2930 |
continue; } |
70dec8079 Btrfs: extent_io ... |
2931 2932 2933 2934 2935 |
/* we have an inline extent but it didn't get marked up * to date. Error out */ if (block_start == EXTENT_MAP_INLINE) { SetPageError(page); |
4b384318a btrfs: Introduce ... |
2936 2937 |
if (!parent_locked) unlock_extent(tree, cur, cur + iosize - 1); |
70dec8079 Btrfs: extent_io ... |
2938 |
cur = cur + iosize; |
306e16ce1 btrfs: rename var... |
2939 |
pg_offset += iosize; |
70dec8079 Btrfs: extent_io ... |
2940 2941 |
continue; } |
d1310b2e0 Btrfs: Split the ... |
2942 |
|
c8f2f24bd Btrfs: remove unu... |
2943 |
pnr -= page->index; |
d4c7ca86b Btrfs: use REQ_ME... |
2944 |
ret = submit_extent_page(rw, tree, page, |
306e16ce1 btrfs: rename var... |
2945 |
sector, disk_io_size, pg_offset, |
89642229a Btrfs: Search dat... |
2946 |
bdev, bio, pnr, |
c8b978188 Btrfs: Add zlib c... |
2947 2948 2949 |
end_bio_extent_readpage, mirror_num, *bio_flags, this_bio_flag); |
c8f2f24bd Btrfs: remove unu... |
2950 2951 2952 2953 |
if (!ret) { nr++; *bio_flags = this_bio_flag; } else { |
d1310b2e0 Btrfs: Split the ... |
2954 |
SetPageError(page); |
4b384318a btrfs: Introduce ... |
2955 2956 |
if (!parent_locked) unlock_extent(tree, cur, cur + iosize - 1); |
edd33c99c Btrfs: don't bug ... |
2957 |
} |
d1310b2e0 Btrfs: Split the ... |
2958 |
cur = cur + iosize; |
306e16ce1 btrfs: rename var... |
2959 |
pg_offset += iosize; |
d1310b2e0 Btrfs: Split the ... |
2960 |
} |
90a887c9a btrfs: add cleanc... |
2961 |
out: |
d1310b2e0 Btrfs: Split the ... |
2962 2963 2964 2965 2966 2967 2968 |
if (!nr) { if (!PageError(page)) SetPageUptodate(page); unlock_page(page); } return 0; } |
9974090bd Btrfs: batch the ... |
2969 2970 2971 2972 |
static inline void __do_contiguous_readpages(struct extent_io_tree *tree, struct page *pages[], int nr_pages, u64 start, u64 end, get_extent_t *get_extent, |
125bac016 Btrfs: cache the ... |
2973 |
struct extent_map **em_cached, |
9974090bd Btrfs: batch the ... |
2974 2975 2976 2977 2978 2979 2980 2981 2982 2983 2984 2985 2986 2987 2988 2989 2990 2991 2992 2993 |
struct bio **bio, int mirror_num, unsigned long *bio_flags, int rw) { struct inode *inode; struct btrfs_ordered_extent *ordered; int index; inode = pages[0]->mapping->host; while (1) { lock_extent(tree, start, end); ordered = btrfs_lookup_ordered_range(inode, start, end - start + 1); if (!ordered) break; unlock_extent(tree, start, end); btrfs_start_ordered_extent(inode, ordered, 1); btrfs_put_ordered_extent(ordered); } for (index = 0; index < nr_pages; index++) { |
125bac016 Btrfs: cache the ... |
2994 2995 |
__do_readpage(tree, pages[index], get_extent, em_cached, bio, mirror_num, bio_flags, rw); |
9974090bd Btrfs: batch the ... |
2996 2997 2998 2999 3000 3001 3002 |
page_cache_release(pages[index]); } } static void __extent_readpages(struct extent_io_tree *tree, struct page *pages[], int nr_pages, get_extent_t *get_extent, |
125bac016 Btrfs: cache the ... |
3003 |
struct extent_map **em_cached, |
9974090bd Btrfs: batch the ... |
3004 3005 3006 |
struct bio **bio, int mirror_num, unsigned long *bio_flags, int rw) { |
35a3621be Btrfs: get rid of... |
3007 |
u64 start = 0; |
9974090bd Btrfs: batch the ... |
3008 3009 3010 |
u64 end = 0; u64 page_start; int index; |
35a3621be Btrfs: get rid of... |
3011 |
int first_index = 0; |
9974090bd Btrfs: batch the ... |
3012 3013 3014 3015 3016 3017 3018 3019 3020 3021 3022 3023 |
for (index = 0; index < nr_pages; index++) { page_start = page_offset(pages[index]); if (!end) { start = page_start; end = start + PAGE_CACHE_SIZE - 1; first_index = index; } else if (end + 1 == page_start) { end += PAGE_CACHE_SIZE; } else { __do_contiguous_readpages(tree, &pages[first_index], index - first_index, start, |
125bac016 Btrfs: cache the ... |
3024 3025 3026 |
end, get_extent, em_cached, bio, mirror_num, bio_flags, rw); |
9974090bd Btrfs: batch the ... |
3027 3028 3029 3030 3031 3032 3033 3034 3035 |
start = page_start; end = start + PAGE_CACHE_SIZE - 1; first_index = index; } } if (end) __do_contiguous_readpages(tree, &pages[first_index], index - first_index, start, |
125bac016 Btrfs: cache the ... |
3036 |
end, get_extent, em_cached, bio, |
9974090bd Btrfs: batch the ... |
3037 3038 3039 3040 3041 3042 3043 3044 3045 3046 3047 3048 3049 3050 3051 3052 3053 3054 3055 3056 3057 3058 3059 3060 |
mirror_num, bio_flags, rw); } static int __extent_read_full_page(struct extent_io_tree *tree, struct page *page, get_extent_t *get_extent, struct bio **bio, int mirror_num, unsigned long *bio_flags, int rw) { struct inode *inode = page->mapping->host; struct btrfs_ordered_extent *ordered; u64 start = page_offset(page); u64 end = start + PAGE_CACHE_SIZE - 1; int ret; while (1) { lock_extent(tree, start, end); ordered = btrfs_lookup_ordered_extent(inode, start); if (!ordered) break; unlock_extent(tree, start, end); btrfs_start_ordered_extent(inode, ordered, 1); btrfs_put_ordered_extent(ordered); } |
125bac016 Btrfs: cache the ... |
3061 3062 |
ret = __do_readpage(tree, page, get_extent, NULL, bio, mirror_num, bio_flags, rw); |
9974090bd Btrfs: batch the ... |
3063 3064 |
return ret; } |
d1310b2e0 Btrfs: Split the ... |
3065 |
int extent_read_full_page(struct extent_io_tree *tree, struct page *page, |
8ddc7d9cd btrfs: add mirror... |
3066 |
get_extent_t *get_extent, int mirror_num) |
d1310b2e0 Btrfs: Split the ... |
3067 3068 |
{ struct bio *bio = NULL; |
c8b978188 Btrfs: Add zlib c... |
3069 |
unsigned long bio_flags = 0; |
d1310b2e0 Btrfs: Split the ... |
3070 |
int ret; |
8ddc7d9cd btrfs: add mirror... |
3071 |
ret = __extent_read_full_page(tree, page, get_extent, &bio, mirror_num, |
d4c7ca86b Btrfs: use REQ_ME... |
3072 |
&bio_flags, READ); |
d1310b2e0 Btrfs: Split the ... |
3073 |
if (bio) |
8ddc7d9cd btrfs: add mirror... |
3074 |
ret = submit_one_bio(READ, bio, mirror_num, bio_flags); |
d1310b2e0 Btrfs: Split the ... |
3075 3076 |
return ret; } |
d1310b2e0 Btrfs: Split the ... |
3077 |
|
4b384318a btrfs: Introduce ... |
3078 3079 3080 3081 3082 3083 3084 3085 3086 3087 3088 3089 3090 |
int extent_read_full_page_nolock(struct extent_io_tree *tree, struct page *page, get_extent_t *get_extent, int mirror_num) { struct bio *bio = NULL; unsigned long bio_flags = EXTENT_BIO_PARENT_LOCKED; int ret; ret = __do_readpage(tree, page, get_extent, NULL, &bio, mirror_num, &bio_flags, READ); if (bio) ret = submit_one_bio(READ, bio, mirror_num, bio_flags); return ret; } |
11c8349b4 Btrfs: fix oops o... |
3091 3092 3093 3094 3095 3096 3097 3098 3099 |
static noinline void update_nr_written(struct page *page, struct writeback_control *wbc, unsigned long nr_written) { wbc->nr_to_write -= nr_written; if (wbc->range_cyclic || (wbc->nr_to_write > 0 && wbc->range_start == 0 && wbc->range_end == LLONG_MAX)) page->mapping->writeback_index = page->index + nr_written; } |
d1310b2e0 Btrfs: Split the ... |
3100 |
/* |
40f765805 Btrfs: split up _... |
3101 3102 3103 3104 3105 3106 3107 3108 |
* helper for __extent_writepage, doing all of the delayed allocation setup. * * This returns 1 if our fill_delalloc function did all the work required * to write the page (copy into inline extent). In this case the IO has * been started and the page is already unlocked. * * This returns 0 if all went well (page still locked) * This returns < 0 if there were errors (page still locked) |
d1310b2e0 Btrfs: Split the ... |
3109 |
*/ |
40f765805 Btrfs: split up _... |
3110 3111 3112 3113 3114 3115 3116 3117 3118 3119 3120 3121 3122 3123 3124 3125 3126 3127 3128 3129 3130 3131 3132 3133 3134 3135 3136 3137 3138 3139 3140 3141 3142 3143 3144 3145 3146 3147 3148 3149 3150 3151 3152 3153 3154 3155 3156 3157 3158 3159 3160 3161 3162 3163 3164 3165 3166 3167 3168 3169 3170 3171 3172 3173 3174 3175 3176 3177 3178 3179 3180 3181 3182 3183 3184 3185 3186 3187 3188 3189 3190 3191 3192 3193 3194 3195 3196 3197 3198 3199 3200 3201 3202 3203 3204 3205 |
static noinline_for_stack int writepage_delalloc(struct inode *inode, struct page *page, struct writeback_control *wbc, struct extent_page_data *epd, u64 delalloc_start, unsigned long *nr_written) { struct extent_io_tree *tree = epd->tree; u64 page_end = delalloc_start + PAGE_CACHE_SIZE - 1; u64 nr_delalloc; u64 delalloc_to_write = 0; u64 delalloc_end = 0; int ret; int page_started = 0; if (epd->extent_locked || !tree->ops || !tree->ops->fill_delalloc) return 0; while (delalloc_end < page_end) { nr_delalloc = find_lock_delalloc_range(inode, tree, page, &delalloc_start, &delalloc_end, 128 * 1024 * 1024); if (nr_delalloc == 0) { delalloc_start = delalloc_end + 1; continue; } ret = tree->ops->fill_delalloc(inode, page, delalloc_start, delalloc_end, &page_started, nr_written); /* File system has been set read-only */ if (ret) { SetPageError(page); /* fill_delalloc should be return < 0 for error * but just in case, we use > 0 here meaning the * IO is started, so we don't want to return > 0 * unless things are going well. */ ret = ret < 0 ? ret : -EIO; goto done; } /* * delalloc_end is already one less than the total * length, so we don't subtract one from * PAGE_CACHE_SIZE */ delalloc_to_write += (delalloc_end - delalloc_start + PAGE_CACHE_SIZE) >> PAGE_CACHE_SHIFT; delalloc_start = delalloc_end + 1; } if (wbc->nr_to_write < delalloc_to_write) { int thresh = 8192; if (delalloc_to_write < thresh * 2) thresh = delalloc_to_write; wbc->nr_to_write = min_t(u64, delalloc_to_write, thresh); } /* did the fill delalloc function already unlock and start * the IO? */ if (page_started) { /* * we've unlocked the page, so we can't update * the mapping's writeback index, just update * nr_to_write. */ wbc->nr_to_write -= *nr_written; return 1; } ret = 0; done: return ret; } /* * helper for __extent_writepage. This calls the writepage start hooks, * and does the loop to map the page into extents and bios. * * We return 1 if the IO is started and the page is unlocked, * 0 if all went well (page still locked) * < 0 if there were errors (page still locked) */ static noinline_for_stack int __extent_writepage_io(struct inode *inode, struct page *page, struct writeback_control *wbc, struct extent_page_data *epd, loff_t i_size, unsigned long nr_written, int write_flags, int *nr_ret) |
d1310b2e0 Btrfs: Split the ... |
3206 |
{ |
d1310b2e0 Btrfs: Split the ... |
3207 |
struct extent_io_tree *tree = epd->tree; |
4eee4fa4f Btrfs: use wrappe... |
3208 |
u64 start = page_offset(page); |
d1310b2e0 Btrfs: Split the ... |
3209 3210 3211 3212 |
u64 page_end = start + PAGE_CACHE_SIZE - 1; u64 end; u64 cur = start; u64 extent_offset; |
d1310b2e0 Btrfs: Split the ... |
3213 3214 3215 |
u64 block_start; u64 iosize; sector_t sector; |
2c64c53d8 Btrfs: cache valu... |
3216 |
struct extent_state *cached_state = NULL; |
d1310b2e0 Btrfs: Split the ... |
3217 3218 |
struct extent_map *em; struct block_device *bdev; |
7f3c74fb8 Btrfs: Keep exten... |
3219 |
size_t pg_offset = 0; |
d1310b2e0 Btrfs: Split the ... |
3220 |
size_t blocksize; |
40f765805 Btrfs: split up _... |
3221 3222 3223 |
int ret = 0; int nr = 0; bool compressed; |
c8b978188 Btrfs: Add zlib c... |
3224 |
|
247e743cb Btrfs: Use async ... |
3225 |
if (tree->ops && tree->ops->writepage_start_hook) { |
c8b978188 Btrfs: Add zlib c... |
3226 3227 |
ret = tree->ops->writepage_start_hook(page, start, page_end); |
87826df0e btrfs: delalloc f... |
3228 3229 3230 3231 3232 3233 |
if (ret) { /* Fixup worker will requeue */ if (ret == -EBUSY) wbc->pages_skipped++; else redirty_page_for_writepage(wbc, page); |
40f765805 Btrfs: split up _... |
3234 |
|
11c8349b4 Btrfs: fix oops o... |
3235 |
update_nr_written(page, wbc, nr_written); |
247e743cb Btrfs: Use async ... |
3236 |
unlock_page(page); |
40f765805 Btrfs: split up _... |
3237 |
ret = 1; |
11c8349b4 Btrfs: fix oops o... |
3238 |
goto done_unlocked; |
247e743cb Btrfs: Use async ... |
3239 3240 |
} } |
11c8349b4 Btrfs: fix oops o... |
3241 3242 3243 3244 3245 |
/* * we don't want to touch the inode after unlocking the page, * so we update the mapping writeback index now */ update_nr_written(page, wbc, nr_written + 1); |
771ed689d Btrfs: Optimize c... |
3246 |
|
d1310b2e0 Btrfs: Split the ... |
3247 |
end = page_end; |
40f765805 Btrfs: split up _... |
3248 |
if (i_size <= start) { |
e6dcd2dc9 Btrfs: New data=o... |
3249 3250 3251 |
if (tree->ops && tree->ops->writepage_end_io_hook) tree->ops->writepage_end_io_hook(page, start, page_end, NULL, 1); |
d1310b2e0 Btrfs: Split the ... |
3252 3253 |
goto done; } |
d1310b2e0 Btrfs: Split the ... |
3254 3255 3256 |
blocksize = inode->i_sb->s_blocksize; while (cur <= end) { |
40f765805 Btrfs: split up _... |
3257 3258 |
u64 em_end; if (cur >= i_size) { |
e6dcd2dc9 Btrfs: New data=o... |
3259 3260 3261 |
if (tree->ops && tree->ops->writepage_end_io_hook) tree->ops->writepage_end_io_hook(page, cur, page_end, NULL, 1); |
d1310b2e0 Btrfs: Split the ... |
3262 3263 |
break; } |
7f3c74fb8 Btrfs: Keep exten... |
3264 |
em = epd->get_extent(inode, page, pg_offset, cur, |
d1310b2e0 Btrfs: Split the ... |
3265 |
end - cur + 1, 1); |
c704005d8 btrfs: unify chec... |
3266 |
if (IS_ERR_OR_NULL(em)) { |
d1310b2e0 Btrfs: Split the ... |
3267 |
SetPageError(page); |
61391d562 Btrfs: fix hang o... |
3268 |
ret = PTR_ERR_OR_ZERO(em); |
d1310b2e0 Btrfs: Split the ... |
3269 3270 3271 3272 |
break; } extent_offset = cur - em->start; |
40f765805 Btrfs: split up _... |
3273 3274 |
em_end = extent_map_end(em); BUG_ON(em_end <= cur); |
d1310b2e0 Btrfs: Split the ... |
3275 |
BUG_ON(end < cur); |
40f765805 Btrfs: split up _... |
3276 |
iosize = min(em_end - cur, end - cur + 1); |
fda2832fe btrfs: cleanup fo... |
3277 |
iosize = ALIGN(iosize, blocksize); |
d1310b2e0 Btrfs: Split the ... |
3278 3279 3280 |
sector = (em->block_start + extent_offset) >> 9; bdev = em->bdev; block_start = em->block_start; |
c8b978188 Btrfs: Add zlib c... |
3281 |
compressed = test_bit(EXTENT_FLAG_COMPRESSED, &em->flags); |
d1310b2e0 Btrfs: Split the ... |
3282 3283 |
free_extent_map(em); em = NULL; |
c8b978188 Btrfs: Add zlib c... |
3284 3285 3286 3287 3288 |
/* * compressed and inline extents are written through other * paths in the FS */ if (compressed || block_start == EXTENT_MAP_HOLE || |
d1310b2e0 Btrfs: Split the ... |
3289 |
block_start == EXTENT_MAP_INLINE) { |
c8b978188 Btrfs: Add zlib c... |
3290 3291 3292 3293 3294 3295 |
/* * end_io notification does not happen here for * compressed extents */ if (!compressed && tree->ops && tree->ops->writepage_end_io_hook) |
e6dcd2dc9 Btrfs: New data=o... |
3296 3297 3298 |
tree->ops->writepage_end_io_hook(page, cur, cur + iosize - 1, NULL, 1); |
c8b978188 Btrfs: Add zlib c... |
3299 3300 3301 3302 3303 3304 3305 3306 3307 |
else if (compressed) { /* we don't want to end_page_writeback on * a compressed extent. this happens * elsewhere */ nr++; } cur += iosize; |
7f3c74fb8 Btrfs: Keep exten... |
3308 |
pg_offset += iosize; |
d1310b2e0 Btrfs: Split the ... |
3309 3310 |
continue; } |
c8b978188 Btrfs: Add zlib c... |
3311 |
|
d1310b2e0 Btrfs: Split the ... |
3312 3313 3314 3315 3316 3317 |
if (tree->ops && tree->ops->writepage_io_hook) { ret = tree->ops->writepage_io_hook(page, cur, cur + iosize - 1); } else { ret = 0; } |
1259ab75c Btrfs: Handle wri... |
3318 |
if (ret) { |
d1310b2e0 Btrfs: Split the ... |
3319 |
SetPageError(page); |
1259ab75c Btrfs: Handle wri... |
3320 |
} else { |
40f765805 Btrfs: split up _... |
3321 |
unsigned long max_nr = (i_size >> PAGE_CACHE_SHIFT) + 1; |
7f3c74fb8 Btrfs: Keep exten... |
3322 |
|
d1310b2e0 Btrfs: Split the ... |
3323 3324 |
set_range_writeback(tree, cur, cur + iosize - 1); if (!PageWriteback(page)) { |
efe120a06 Btrfs: convert pr... |
3325 3326 |
btrfs_err(BTRFS_I(inode)->root->fs_info, "page %lu not writeback, cur %llu end %llu", |
c1c9ff7c9 Btrfs: Remove sup... |
3327 |
page->index, cur, end); |
d1310b2e0 Btrfs: Split the ... |
3328 |
} |
ffbd517d5 Btrfs: use WRITE_... |
3329 3330 3331 |
ret = submit_extent_page(write_flags, tree, page, sector, iosize, pg_offset, bdev, &epd->bio, max_nr, |
c8b978188 Btrfs: Add zlib c... |
3332 3333 |
end_bio_extent_writepage, 0, 0, 0); |
d1310b2e0 Btrfs: Split the ... |
3334 3335 3336 3337 |
if (ret) SetPageError(page); } cur = cur + iosize; |
7f3c74fb8 Btrfs: Keep exten... |
3338 |
pg_offset += iosize; |
d1310b2e0 Btrfs: Split the ... |
3339 3340 3341 |
nr++; } done: |
40f765805 Btrfs: split up _... |
3342 3343 3344 3345 3346 3347 3348 3349 3350 3351 3352 3353 3354 3355 3356 3357 3358 3359 3360 3361 3362 3363 3364 3365 3366 3367 3368 3369 3370 3371 3372 3373 3374 3375 3376 3377 3378 3379 3380 3381 3382 3383 3384 3385 3386 3387 3388 3389 3390 3391 3392 3393 3394 3395 3396 3397 3398 3399 3400 3401 3402 3403 3404 3405 3406 3407 3408 3409 3410 3411 3412 3413 3414 3415 3416 |
*nr_ret = nr; done_unlocked: /* drop our reference on any cached states */ free_extent_state(cached_state); return ret; } /* * the writepage semantics are similar to regular writepage. extent * records are inserted to lock ranges in the tree, and as dirty areas * are found, they are marked writeback. Then the lock bits are removed * and the end_io handler clears the writeback ranges */ static int __extent_writepage(struct page *page, struct writeback_control *wbc, void *data) { struct inode *inode = page->mapping->host; struct extent_page_data *epd = data; u64 start = page_offset(page); u64 page_end = start + PAGE_CACHE_SIZE - 1; int ret; int nr = 0; size_t pg_offset = 0; loff_t i_size = i_size_read(inode); unsigned long end_index = i_size >> PAGE_CACHE_SHIFT; int write_flags; unsigned long nr_written = 0; if (wbc->sync_mode == WB_SYNC_ALL) write_flags = WRITE_SYNC; else write_flags = WRITE; trace___extent_writepage(page, inode, wbc); WARN_ON(!PageLocked(page)); ClearPageError(page); pg_offset = i_size & (PAGE_CACHE_SIZE - 1); if (page->index > end_index || (page->index == end_index && !pg_offset)) { page->mapping->a_ops->invalidatepage(page, 0, PAGE_CACHE_SIZE); unlock_page(page); return 0; } if (page->index == end_index) { char *userpage; userpage = kmap_atomic(page); memset(userpage + pg_offset, 0, PAGE_CACHE_SIZE - pg_offset); kunmap_atomic(userpage); flush_dcache_page(page); } pg_offset = 0; set_page_extent_mapped(page); ret = writepage_delalloc(inode, page, wbc, epd, start, &nr_written); if (ret == 1) goto done_unlocked; if (ret) goto done; ret = __extent_writepage_io(inode, page, wbc, epd, i_size, nr_written, write_flags, &nr); if (ret == 1) goto done_unlocked; done: |
d1310b2e0 Btrfs: Split the ... |
3417 3418 3419 3420 3421 |
if (nr == 0) { /* make sure the mapping tag for page dirty gets cleared */ set_page_writeback(page); end_page_writeback(page); } |
61391d562 Btrfs: fix hang o... |
3422 3423 3424 3425 |
if (PageError(page)) { ret = ret < 0 ? ret : -EIO; end_extent_writepage(page, ret, start, page_end); } |
d1310b2e0 Btrfs: Split the ... |
3426 |
unlock_page(page); |
40f765805 Btrfs: split up _... |
3427 |
return ret; |
771ed689d Btrfs: Optimize c... |
3428 |
|
11c8349b4 Btrfs: fix oops o... |
3429 |
done_unlocked: |
d1310b2e0 Btrfs: Split the ... |
3430 3431 |
return 0; } |
fd8b2b611 Btrfs: cleanup de... |
3432 |
void wait_on_extent_buffer_writeback(struct extent_buffer *eb) |
0b32f4bbb Btrfs: ensure an ... |
3433 |
{ |
743162013 sched: Remove pro... |
3434 3435 |
wait_on_bit_io(&eb->bflags, EXTENT_BUFFER_WRITEBACK, TASK_UNINTERRUPTIBLE); |
0b32f4bbb Btrfs: ensure an ... |
3436 |
} |
0e378df15 Btrfs: cut down s... |
3437 3438 3439 3440 |
static noinline_for_stack int lock_extent_buffer_for_io(struct extent_buffer *eb, struct btrfs_fs_info *fs_info, struct extent_page_data *epd) |
0b32f4bbb Btrfs: ensure an ... |
3441 3442 3443 3444 3445 3446 3447 3448 3449 3450 3451 3452 3453 3454 3455 3456 3457 3458 3459 |
{ unsigned long i, num_pages; int flush = 0; int ret = 0; if (!btrfs_try_tree_write_lock(eb)) { flush = 1; flush_write_bio(epd); btrfs_tree_lock(eb); } if (test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags)) { btrfs_tree_unlock(eb); if (!epd->sync_io) return 0; if (!flush) { flush_write_bio(epd); flush = 1; } |
a098d8e8e Btrfs: loop waiti... |
3460 3461 3462 3463 3464 |
while (1) { wait_on_extent_buffer_writeback(eb); btrfs_tree_lock(eb); if (!test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags)) break; |
0b32f4bbb Btrfs: ensure an ... |
3465 |
btrfs_tree_unlock(eb); |
0b32f4bbb Btrfs: ensure an ... |
3466 3467 |
} } |
51561ffec Btrfs: lock the t... |
3468 3469 3470 3471 3472 3473 |
/* * We need to do this to prevent races in people who check if the eb is * under IO since we can end up having no IO bits set for a short period * of time. */ spin_lock(&eb->refs_lock); |
0b32f4bbb Btrfs: ensure an ... |
3474 3475 |
if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)) { set_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags); |
51561ffec Btrfs: lock the t... |
3476 |
spin_unlock(&eb->refs_lock); |
0b32f4bbb Btrfs: ensure an ... |
3477 |
btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN); |
e2d845211 Btrfs: use percpu... |
3478 3479 3480 |
__percpu_counter_add(&fs_info->dirty_metadata_bytes, -eb->len, fs_info->dirty_metadata_batch); |
0b32f4bbb Btrfs: ensure an ... |
3481 |
ret = 1; |
51561ffec Btrfs: lock the t... |
3482 3483 |
} else { spin_unlock(&eb->refs_lock); |
0b32f4bbb Btrfs: ensure an ... |
3484 3485 3486 3487 3488 3489 3490 3491 3492 |
} btrfs_tree_unlock(eb); if (!ret) return ret; num_pages = num_extent_pages(eb->start, eb->len); for (i = 0; i < num_pages; i++) { |
fb85fc9a6 btrfs: kill exten... |
3493 |
struct page *p = eb->pages[i]; |
0b32f4bbb Btrfs: ensure an ... |
3494 3495 3496 3497 3498 3499 3500 3501 3502 3503 3504 3505 3506 3507 3508 3509 |
if (!trylock_page(p)) { if (!flush) { flush_write_bio(epd); flush = 1; } lock_page(p); } } return ret; } static void end_extent_buffer_writeback(struct extent_buffer *eb) { clear_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags); |
4e857c58e arch: Mass conver... |
3510 |
smp_mb__after_atomic(); |
0b32f4bbb Btrfs: ensure an ... |
3511 3512 |
wake_up_bit(&eb->bflags, EXTENT_BUFFER_WRITEBACK); } |
656f30dba Btrfs: be aware o... |
3513 3514 3515 3516 3517 3518 3519 3520 3521 3522 3523 3524 3525 3526 3527 3528 3529 3530 3531 3532 3533 3534 3535 3536 3537 3538 3539 3540 3541 3542 3543 3544 3545 3546 3547 3548 3549 3550 3551 3552 3553 3554 3555 3556 3557 3558 3559 3560 3561 3562 3563 3564 3565 3566 3567 3568 3569 3570 3571 3572 3573 |
static void set_btree_ioerr(struct page *page) { struct extent_buffer *eb = (struct extent_buffer *)page->private; struct btrfs_inode *btree_ino = BTRFS_I(eb->fs_info->btree_inode); SetPageError(page); if (test_and_set_bit(EXTENT_BUFFER_WRITE_ERR, &eb->bflags)) return; /* * If writeback for a btree extent that doesn't belong to a log tree * failed, increment the counter transaction->eb_write_errors. * We do this because while the transaction is running and before it's * committing (when we call filemap_fdata[write|wait]_range against * the btree inode), we might have * btree_inode->i_mapping->a_ops->writepages() called by the VM - if it * returns an error or an error happens during writeback, when we're * committing the transaction we wouldn't know about it, since the pages * can be no longer dirty nor marked anymore for writeback (if a * subsequent modification to the extent buffer didn't happen before the * transaction commit), which makes filemap_fdata[write|wait]_range not * able to find the pages tagged with SetPageError at transaction * commit time. So if this happens we must abort the transaction, * otherwise we commit a super block with btree roots that point to * btree nodes/leafs whose content on disk is invalid - either garbage * or the content of some node/leaf from a past generation that got * cowed or deleted and is no longer valid. * * Note: setting AS_EIO/AS_ENOSPC in the btree inode's i_mapping would * not be enough - we need to distinguish between log tree extents vs * non-log tree extents, and the next filemap_fdatawait_range() call * will catch and clear such errors in the mapping - and that call might * be from a log sync and not from a transaction commit. Also, checking * for the eb flag EXTENT_BUFFER_WRITE_ERR at transaction commit time is * not done and would not be reliable - the eb might have been released * from memory and reading it back again means that flag would not be * set (since it's a runtime flag, not persisted on disk). * * Using the flags below in the btree inode also makes us achieve the * goal of AS_EIO/AS_ENOSPC when writepages() returns success, started * writeback for all dirty pages and before filemap_fdatawait_range() * is called, the writeback for all dirty pages had already finished * with errors - because we were not using AS_EIO/AS_ENOSPC, * filemap_fdatawait_range() would return success, as it could not know * that writeback errors happened (the pages were no longer tagged for * writeback). */ switch (eb->log_index) { case -1: set_bit(BTRFS_INODE_BTREE_ERR, &btree_ino->runtime_flags); break; case 0: set_bit(BTRFS_INODE_BTREE_LOG1_ERR, &btree_ino->runtime_flags); break; case 1: set_bit(BTRFS_INODE_BTREE_LOG2_ERR, &btree_ino->runtime_flags); break; default: BUG(); /* unexpected, logic error */ } } |
0b32f4bbb Btrfs: ensure an ... |
3574 3575 |
static void end_bio_extent_buffer_writepage(struct bio *bio, int err) { |
2c30c71bd block: Convert va... |
3576 |
struct bio_vec *bvec; |
0b32f4bbb Btrfs: ensure an ... |
3577 |
struct extent_buffer *eb; |
2c30c71bd block: Convert va... |
3578 |
int i, done; |
0b32f4bbb Btrfs: ensure an ... |
3579 |
|
2c30c71bd block: Convert va... |
3580 |
bio_for_each_segment_all(bvec, bio, i) { |
0b32f4bbb Btrfs: ensure an ... |
3581 |
struct page *page = bvec->bv_page; |
0b32f4bbb Btrfs: ensure an ... |
3582 3583 3584 |
eb = (struct extent_buffer *)page->private; BUG_ON(!eb); done = atomic_dec_and_test(&eb->io_pages); |
656f30dba Btrfs: be aware o... |
3585 |
if (err || test_bit(EXTENT_BUFFER_WRITE_ERR, &eb->bflags)) { |
0b32f4bbb Btrfs: ensure an ... |
3586 |
ClearPageUptodate(page); |
656f30dba Btrfs: be aware o... |
3587 |
set_btree_ioerr(page); |
0b32f4bbb Btrfs: ensure an ... |
3588 3589 3590 3591 3592 3593 3594 3595 |
} end_page_writeback(page); if (!done) continue; end_extent_buffer_writeback(eb); |
2c30c71bd block: Convert va... |
3596 |
} |
0b32f4bbb Btrfs: ensure an ... |
3597 3598 |
bio_put(bio); |
0b32f4bbb Btrfs: ensure an ... |
3599 |
} |
0e378df15 Btrfs: cut down s... |
3600 |
static noinline_for_stack int write_one_eb(struct extent_buffer *eb, |
0b32f4bbb Btrfs: ensure an ... |
3601 3602 3603 3604 3605 |
struct btrfs_fs_info *fs_info, struct writeback_control *wbc, struct extent_page_data *epd) { struct block_device *bdev = fs_info->fs_devices->latest_bdev; |
f28491e0a Btrfs: move the e... |
3606 |
struct extent_io_tree *tree = &BTRFS_I(fs_info->btree_inode)->io_tree; |
0b32f4bbb Btrfs: ensure an ... |
3607 3608 |
u64 offset = eb->start; unsigned long i, num_pages; |
de0022b9d Btrfs: do not asy... |
3609 |
unsigned long bio_flags = 0; |
d4c7ca86b Btrfs: use REQ_ME... |
3610 |
int rw = (epd->sync_io ? WRITE_SYNC : WRITE) | REQ_META; |
d7dbe9e7f Btrfs: fix compil... |
3611 |
int ret = 0; |
0b32f4bbb Btrfs: ensure an ... |
3612 |
|
656f30dba Btrfs: be aware o... |
3613 |
clear_bit(EXTENT_BUFFER_WRITE_ERR, &eb->bflags); |
0b32f4bbb Btrfs: ensure an ... |
3614 3615 |
num_pages = num_extent_pages(eb->start, eb->len); atomic_set(&eb->io_pages, num_pages); |
de0022b9d Btrfs: do not asy... |
3616 3617 |
if (btrfs_header_owner(eb) == BTRFS_TREE_LOG_OBJECTID) bio_flags = EXTENT_BIO_TREE_LOG; |
0b32f4bbb Btrfs: ensure an ... |
3618 |
for (i = 0; i < num_pages; i++) { |
fb85fc9a6 btrfs: kill exten... |
3619 |
struct page *p = eb->pages[i]; |
0b32f4bbb Btrfs: ensure an ... |
3620 3621 3622 |
clear_page_dirty_for_io(p); set_page_writeback(p); |
f28491e0a Btrfs: move the e... |
3623 |
ret = submit_extent_page(rw, tree, p, offset >> 9, |
0b32f4bbb Btrfs: ensure an ... |
3624 3625 |
PAGE_CACHE_SIZE, 0, bdev, &epd->bio, -1, end_bio_extent_buffer_writepage, |
de0022b9d Btrfs: do not asy... |
3626 3627 |
0, epd->bio_flags, bio_flags); epd->bio_flags = bio_flags; |
0b32f4bbb Btrfs: ensure an ... |
3628 |
if (ret) { |
656f30dba Btrfs: be aware o... |
3629 |
set_btree_ioerr(p); |
55e3bd2e0 Btrfs: add missin... |
3630 |
end_page_writeback(p); |
0b32f4bbb Btrfs: ensure an ... |
3631 3632 3633 3634 3635 3636 3637 3638 3639 3640 3641 3642 |
if (atomic_sub_and_test(num_pages - i, &eb->io_pages)) end_extent_buffer_writeback(eb); ret = -EIO; break; } offset += PAGE_CACHE_SIZE; update_nr_written(p, wbc, 1); unlock_page(p); } if (unlikely(ret)) { for (; i < num_pages; i++) { |
bbf65cf0b Merge branch 'cle... |
3643 |
struct page *p = eb->pages[i]; |
814650282 Btrfs: fix crash ... |
3644 |
clear_page_dirty_for_io(p); |
0b32f4bbb Btrfs: ensure an ... |
3645 3646 3647 3648 3649 3650 3651 3652 3653 3654 3655 3656 3657 3658 3659 3660 3661 3662 |
unlock_page(p); } } return ret; } int btree_write_cache_pages(struct address_space *mapping, struct writeback_control *wbc) { struct extent_io_tree *tree = &BTRFS_I(mapping->host)->io_tree; struct btrfs_fs_info *fs_info = BTRFS_I(mapping->host)->root->fs_info; struct extent_buffer *eb, *prev_eb = NULL; struct extent_page_data epd = { .bio = NULL, .tree = tree, .extent_locked = 0, .sync_io = wbc->sync_mode == WB_SYNC_ALL, |
de0022b9d Btrfs: do not asy... |
3663 |
.bio_flags = 0, |
0b32f4bbb Btrfs: ensure an ... |
3664 3665 3666 3667 3668 3669 3670 3671 3672 3673 3674 3675 3676 3677 3678 3679 3680 3681 3682 3683 3684 3685 3686 3687 3688 3689 3690 3691 3692 3693 3694 3695 3696 3697 3698 3699 3700 3701 3702 3703 3704 3705 3706 |
}; int ret = 0; int done = 0; int nr_to_write_done = 0; struct pagevec pvec; int nr_pages; pgoff_t index; pgoff_t end; /* Inclusive */ int scanned = 0; int tag; pagevec_init(&pvec, 0); if (wbc->range_cyclic) { index = mapping->writeback_index; /* Start from prev offset */ end = -1; } else { index = wbc->range_start >> PAGE_CACHE_SHIFT; end = wbc->range_end >> PAGE_CACHE_SHIFT; scanned = 1; } if (wbc->sync_mode == WB_SYNC_ALL) tag = PAGECACHE_TAG_TOWRITE; else tag = PAGECACHE_TAG_DIRTY; retry: if (wbc->sync_mode == WB_SYNC_ALL) tag_pages_for_writeback(mapping, index, end); while (!done && !nr_to_write_done && (index <= end) && (nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag, min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) { unsigned i; scanned = 1; for (i = 0; i < nr_pages; i++) { struct page *page = pvec.pages[i]; if (!PagePrivate(page)) continue; if (!wbc->range_cyclic && page->index > end) { done = 1; break; } |
b5bae2612 Btrfs: fix race w... |
3707 3708 3709 3710 3711 |
spin_lock(&mapping->private_lock); if (!PagePrivate(page)) { spin_unlock(&mapping->private_lock); continue; } |
0b32f4bbb Btrfs: ensure an ... |
3712 |
eb = (struct extent_buffer *)page->private; |
b5bae2612 Btrfs: fix race w... |
3713 3714 3715 3716 3717 3718 |
/* * Shouldn't happen and normally this would be a BUG_ON * but no sense in crashing the users box for something * we can survive anyway. */ |
fae7f21ce btrfs: Use WARN_O... |
3719 |
if (WARN_ON(!eb)) { |
b5bae2612 Btrfs: fix race w... |
3720 |
spin_unlock(&mapping->private_lock); |
0b32f4bbb Btrfs: ensure an ... |
3721 3722 |
continue; } |
b5bae2612 Btrfs: fix race w... |
3723 3724 |
if (eb == prev_eb) { spin_unlock(&mapping->private_lock); |
0b32f4bbb Btrfs: ensure an ... |
3725 |
continue; |
b5bae2612 Btrfs: fix race w... |
3726 |
} |
0b32f4bbb Btrfs: ensure an ... |
3727 |
|
b5bae2612 Btrfs: fix race w... |
3728 3729 3730 |
ret = atomic_inc_not_zero(&eb->refs); spin_unlock(&mapping->private_lock); if (!ret) |
0b32f4bbb Btrfs: ensure an ... |
3731 |
continue; |
0b32f4bbb Btrfs: ensure an ... |
3732 3733 3734 3735 3736 3737 3738 3739 3740 3741 3742 3743 3744 3745 3746 3747 3748 3749 3750 3751 3752 3753 3754 3755 3756 3757 3758 3759 3760 3761 3762 3763 3764 3765 3766 3767 3768 3769 |
prev_eb = eb; ret = lock_extent_buffer_for_io(eb, fs_info, &epd); if (!ret) { free_extent_buffer(eb); continue; } ret = write_one_eb(eb, fs_info, wbc, &epd); if (ret) { done = 1; free_extent_buffer(eb); break; } free_extent_buffer(eb); /* * the filesystem may choose to bump up nr_to_write. * We have to make sure to honor the new nr_to_write * at any time */ nr_to_write_done = wbc->nr_to_write <= 0; } pagevec_release(&pvec); cond_resched(); } if (!scanned && !done) { /* * We hit the last page and there is more work to be done: wrap * back to the start of the file */ scanned = 1; index = 0; goto retry; } flush_write_bio(&epd); return ret; } |
d1310b2e0 Btrfs: Split the ... |
3770 |
/** |
4bef08485 Btrfs: Tree loggi... |
3771 |
* write_cache_pages - walk the list of dirty pages of the given address space and write all of them. |
d1310b2e0 Btrfs: Split the ... |
3772 3773 3774 3775 3776 3777 3778 3779 3780 3781 3782 3783 3784 |
* @mapping: address space structure to write * @wbc: subtract the number of written pages from *@wbc->nr_to_write * @writepage: function called for each page * @data: data passed to writepage function * * If a page is already under I/O, write_cache_pages() skips it, even * if it's dirty. This is desirable behaviour for memory-cleaning writeback, * but it is INCORRECT for data-integrity system calls such as fsync(). fsync() * and msync() need to guarantee that all the data which was dirty at the time * the call was made get new I/O started against them. If wbc->sync_mode is * WB_SYNC_ALL then we were called for data integrity and we must wait for * existing IO to complete. */ |
b2950863c Btrfs: make thing... |
3785 |
static int extent_write_cache_pages(struct extent_io_tree *tree, |
4bef08485 Btrfs: Tree loggi... |
3786 3787 |
struct address_space *mapping, struct writeback_control *wbc, |
d2c3f4f69 Btrfs: Avoid writ... |
3788 3789 |
writepage_t writepage, void *data, void (*flush_fn)(void *)) |
d1310b2e0 Btrfs: Split the ... |
3790 |
{ |
7fd1a3f73 Btrfs: hold a ref... |
3791 |
struct inode *inode = mapping->host; |
d1310b2e0 Btrfs: Split the ... |
3792 3793 |
int ret = 0; int done = 0; |
61391d562 Btrfs: fix hang o... |
3794 |
int err = 0; |
f85d7d6c8 Btrfs: properly h... |
3795 |
int nr_to_write_done = 0; |
d1310b2e0 Btrfs: Split the ... |
3796 3797 3798 3799 3800 |
struct pagevec pvec; int nr_pages; pgoff_t index; pgoff_t end; /* Inclusive */ int scanned = 0; |
f7aaa06bf Btrfs: tag pages ... |
3801 |
int tag; |
d1310b2e0 Btrfs: Split the ... |
3802 |
|
7fd1a3f73 Btrfs: hold a ref... |
3803 3804 3805 3806 3807 3808 3809 3810 3811 3812 3813 |
/* * We have to hold onto the inode so that ordered extents can do their * work when the IO finishes. The alternative to this is failing to add * an ordered extent if the igrab() fails there and that is a huge pain * to deal with, so instead just hold onto the inode throughout the * writepages operation. If it fails here we are freeing up the inode * anyway and we'd rather not waste our time writing out stuff that is * going to be truncated anyway. */ if (!igrab(inode)) return 0; |
d1310b2e0 Btrfs: Split the ... |
3814 3815 3816 3817 3818 3819 3820 |
pagevec_init(&pvec, 0); if (wbc->range_cyclic) { index = mapping->writeback_index; /* Start from prev offset */ end = -1; } else { index = wbc->range_start >> PAGE_CACHE_SHIFT; end = wbc->range_end >> PAGE_CACHE_SHIFT; |
d1310b2e0 Btrfs: Split the ... |
3821 3822 |
scanned = 1; } |
f7aaa06bf Btrfs: tag pages ... |
3823 3824 3825 3826 |
if (wbc->sync_mode == WB_SYNC_ALL) tag = PAGECACHE_TAG_TOWRITE; else tag = PAGECACHE_TAG_DIRTY; |
d1310b2e0 Btrfs: Split the ... |
3827 |
retry: |
f7aaa06bf Btrfs: tag pages ... |
3828 3829 |
if (wbc->sync_mode == WB_SYNC_ALL) tag_pages_for_writeback(mapping, index, end); |
f85d7d6c8 Btrfs: properly h... |
3830 |
while (!done && !nr_to_write_done && (index <= end) && |
f7aaa06bf Btrfs: tag pages ... |
3831 3832 |
(nr_pages = pagevec_lookup_tag(&pvec, mapping, &index, tag, min(end - index, (pgoff_t)PAGEVEC_SIZE-1) + 1))) { |
d1310b2e0 Btrfs: Split the ... |
3833 3834 3835 3836 3837 3838 3839 3840 3841 3842 3843 3844 3845 |
unsigned i; scanned = 1; for (i = 0; i < nr_pages; i++) { struct page *page = pvec.pages[i]; /* * At this point we hold neither mapping->tree_lock nor * lock on the page itself: the page may be truncated or * invalidated (changing page->mapping to NULL), or even * swizzled back from swapper_space to tmpfs file * mapping */ |
c8f2f24bd Btrfs: remove unu... |
3846 3847 3848 |
if (!trylock_page(page)) { flush_fn(data); lock_page(page); |
01d658f2c Btrfs: make sure ... |
3849 |
} |
d1310b2e0 Btrfs: Split the ... |
3850 3851 3852 3853 3854 3855 3856 3857 3858 3859 3860 |
if (unlikely(page->mapping != mapping)) { unlock_page(page); continue; } if (!wbc->range_cyclic && page->index > end) { done = 1; unlock_page(page); continue; } |
d2c3f4f69 Btrfs: Avoid writ... |
3861 |
if (wbc->sync_mode != WB_SYNC_NONE) { |
0e6bd956e Btrfs: only flush... |
3862 3863 |
if (PageWriteback(page)) flush_fn(data); |
d1310b2e0 Btrfs: Split the ... |
3864 |
wait_on_page_writeback(page); |
d2c3f4f69 Btrfs: Avoid writ... |
3865 |
} |
d1310b2e0 Btrfs: Split the ... |
3866 3867 3868 3869 3870 3871 3872 3873 3874 3875 3876 3877 3878 |
if (PageWriteback(page) || !clear_page_dirty_for_io(page)) { unlock_page(page); continue; } ret = (*writepage)(page, wbc, data); if (unlikely(ret == AOP_WRITEPAGE_ACTIVATE)) { unlock_page(page); ret = 0; } |
61391d562 Btrfs: fix hang o... |
3879 3880 |
if (!err && ret < 0) err = ret; |
f85d7d6c8 Btrfs: properly h... |
3881 3882 3883 3884 3885 3886 3887 |
/* * the filesystem may choose to bump up nr_to_write. * We have to make sure to honor the new nr_to_write * at any time */ nr_to_write_done = wbc->nr_to_write <= 0; |
d1310b2e0 Btrfs: Split the ... |
3888 3889 3890 3891 |
} pagevec_release(&pvec); cond_resched(); } |
61391d562 Btrfs: fix hang o... |
3892 |
if (!scanned && !done && !err) { |
d1310b2e0 Btrfs: Split the ... |
3893 3894 3895 3896 3897 3898 3899 3900 |
/* * We hit the last page and there is more work to be done: wrap * back to the start of the file */ scanned = 1; index = 0; goto retry; } |
7fd1a3f73 Btrfs: hold a ref... |
3901 |
btrfs_add_delayed_iput(inode); |
61391d562 Btrfs: fix hang o... |
3902 |
return err; |
d1310b2e0 Btrfs: Split the ... |
3903 |
} |
d1310b2e0 Btrfs: Split the ... |
3904 |
|
ffbd517d5 Btrfs: use WRITE_... |
3905 |
static void flush_epd_write_bio(struct extent_page_data *epd) |
d2c3f4f69 Btrfs: Avoid writ... |
3906 |
{ |
d2c3f4f69 Btrfs: Avoid writ... |
3907 |
if (epd->bio) { |
355808c29 btrfs: ->submit_b... |
3908 3909 |
int rw = WRITE; int ret; |
ffbd517d5 Btrfs: use WRITE_... |
3910 |
if (epd->sync_io) |
355808c29 btrfs: ->submit_b... |
3911 |
rw = WRITE_SYNC; |
de0022b9d Btrfs: do not asy... |
3912 |
ret = submit_one_bio(rw, epd->bio, 0, epd->bio_flags); |
79787eaab btrfs: replace ma... |
3913 |
BUG_ON(ret < 0); /* -ENOMEM */ |
d2c3f4f69 Btrfs: Avoid writ... |
3914 3915 3916 |
epd->bio = NULL; } } |
ffbd517d5 Btrfs: use WRITE_... |
3917 3918 3919 3920 3921 |
static noinline void flush_write_bio(void *data) { struct extent_page_data *epd = data; flush_epd_write_bio(epd); } |
d1310b2e0 Btrfs: Split the ... |
3922 3923 3924 3925 3926 |
int extent_write_full_page(struct extent_io_tree *tree, struct page *page, get_extent_t *get_extent, struct writeback_control *wbc) { int ret; |
d1310b2e0 Btrfs: Split the ... |
3927 3928 3929 3930 |
struct extent_page_data epd = { .bio = NULL, .tree = tree, .get_extent = get_extent, |
771ed689d Btrfs: Optimize c... |
3931 |
.extent_locked = 0, |
ffbd517d5 Btrfs: use WRITE_... |
3932 |
.sync_io = wbc->sync_mode == WB_SYNC_ALL, |
de0022b9d Btrfs: do not asy... |
3933 |
.bio_flags = 0, |
d1310b2e0 Btrfs: Split the ... |
3934 |
}; |
d1310b2e0 Btrfs: Split the ... |
3935 |
|
d1310b2e0 Btrfs: Split the ... |
3936 |
ret = __extent_writepage(page, wbc, &epd); |
ffbd517d5 Btrfs: use WRITE_... |
3937 |
flush_epd_write_bio(&epd); |
d1310b2e0 Btrfs: Split the ... |
3938 3939 |
return ret; } |
d1310b2e0 Btrfs: Split the ... |
3940 |
|
771ed689d Btrfs: Optimize c... |
3941 3942 3943 3944 3945 3946 3947 3948 3949 3950 3951 3952 3953 3954 3955 |
int extent_write_locked_range(struct extent_io_tree *tree, struct inode *inode, u64 start, u64 end, get_extent_t *get_extent, int mode) { int ret = 0; struct address_space *mapping = inode->i_mapping; struct page *page; unsigned long nr_pages = (end - start + PAGE_CACHE_SIZE) >> PAGE_CACHE_SHIFT; struct extent_page_data epd = { .bio = NULL, .tree = tree, .get_extent = get_extent, .extent_locked = 1, |
ffbd517d5 Btrfs: use WRITE_... |
3956 |
.sync_io = mode == WB_SYNC_ALL, |
de0022b9d Btrfs: do not asy... |
3957 |
.bio_flags = 0, |
771ed689d Btrfs: Optimize c... |
3958 3959 |
}; struct writeback_control wbc_writepages = { |
771ed689d Btrfs: Optimize c... |
3960 |
.sync_mode = mode, |
771ed689d Btrfs: Optimize c... |
3961 3962 3963 3964 |
.nr_to_write = nr_pages * 2, .range_start = start, .range_end = end + 1, }; |
d397712bc Btrfs: Fix checkp... |
3965 |
while (start <= end) { |
771ed689d Btrfs: Optimize c... |
3966 3967 3968 3969 3970 3971 3972 3973 3974 3975 3976 3977 3978 |
page = find_get_page(mapping, start >> PAGE_CACHE_SHIFT); if (clear_page_dirty_for_io(page)) ret = __extent_writepage(page, &wbc_writepages, &epd); else { if (tree->ops && tree->ops->writepage_end_io_hook) tree->ops->writepage_end_io_hook(page, start, start + PAGE_CACHE_SIZE - 1, NULL, 1); unlock_page(page); } page_cache_release(page); start += PAGE_CACHE_SIZE; } |
ffbd517d5 Btrfs: use WRITE_... |
3979 |
flush_epd_write_bio(&epd); |
771ed689d Btrfs: Optimize c... |
3980 3981 |
return ret; } |
d1310b2e0 Btrfs: Split the ... |
3982 3983 3984 3985 3986 3987 3988 3989 3990 3991 3992 |
int extent_writepages(struct extent_io_tree *tree, struct address_space *mapping, get_extent_t *get_extent, struct writeback_control *wbc) { int ret = 0; struct extent_page_data epd = { .bio = NULL, .tree = tree, .get_extent = get_extent, |
771ed689d Btrfs: Optimize c... |
3993 |
.extent_locked = 0, |
ffbd517d5 Btrfs: use WRITE_... |
3994 |
.sync_io = wbc->sync_mode == WB_SYNC_ALL, |
de0022b9d Btrfs: do not asy... |
3995 |
.bio_flags = 0, |
d1310b2e0 Btrfs: Split the ... |
3996 |
}; |
4bef08485 Btrfs: Tree loggi... |
3997 |
ret = extent_write_cache_pages(tree, mapping, wbc, |
d2c3f4f69 Btrfs: Avoid writ... |
3998 3999 |
__extent_writepage, &epd, flush_write_bio); |
ffbd517d5 Btrfs: use WRITE_... |
4000 |
flush_epd_write_bio(&epd); |
d1310b2e0 Btrfs: Split the ... |
4001 4002 |
return ret; } |
d1310b2e0 Btrfs: Split the ... |
4003 4004 4005 4006 4007 4008 4009 4010 |
int extent_readpages(struct extent_io_tree *tree, struct address_space *mapping, struct list_head *pages, unsigned nr_pages, get_extent_t get_extent) { struct bio *bio = NULL; unsigned page_idx; |
c8b978188 Btrfs: Add zlib c... |
4011 |
unsigned long bio_flags = 0; |
67c9684f4 Btrfs: improve mu... |
4012 4013 |
struct page *pagepool[16]; struct page *page; |
125bac016 Btrfs: cache the ... |
4014 |
struct extent_map *em_cached = NULL; |
67c9684f4 Btrfs: improve mu... |
4015 |
int nr = 0; |
d1310b2e0 Btrfs: Split the ... |
4016 |
|
d1310b2e0 Btrfs: Split the ... |
4017 |
for (page_idx = 0; page_idx < nr_pages; page_idx++) { |
67c9684f4 Btrfs: improve mu... |
4018 |
page = list_entry(pages->prev, struct page, lru); |
d1310b2e0 Btrfs: Split the ... |
4019 4020 4021 |
prefetchw(&page->flags); list_del(&page->lru); |
67c9684f4 Btrfs: improve mu... |
4022 |
if (add_to_page_cache_lru(page, mapping, |
43e817a1f btrfs: fix wrong ... |
4023 |
page->index, GFP_NOFS)) { |
67c9684f4 Btrfs: improve mu... |
4024 4025 |
page_cache_release(page); continue; |
d1310b2e0 Btrfs: Split the ... |
4026 |
} |
67c9684f4 Btrfs: improve mu... |
4027 4028 4029 4030 |
pagepool[nr++] = page; if (nr < ARRAY_SIZE(pagepool)) continue; |
125bac016 Btrfs: cache the ... |
4031 |
__extent_readpages(tree, pagepool, nr, get_extent, &em_cached, |
9974090bd Btrfs: batch the ... |
4032 |
&bio, 0, &bio_flags, READ); |
67c9684f4 Btrfs: improve mu... |
4033 |
nr = 0; |
d1310b2e0 Btrfs: Split the ... |
4034 |
} |
9974090bd Btrfs: batch the ... |
4035 |
if (nr) |
125bac016 Btrfs: cache the ... |
4036 |
__extent_readpages(tree, pagepool, nr, get_extent, &em_cached, |
9974090bd Btrfs: batch the ... |
4037 |
&bio, 0, &bio_flags, READ); |
67c9684f4 Btrfs: improve mu... |
4038 |
|
125bac016 Btrfs: cache the ... |
4039 4040 |
if (em_cached) free_extent_map(em_cached); |
d1310b2e0 Btrfs: Split the ... |
4041 4042 |
BUG_ON(!list_empty(pages)); if (bio) |
79787eaab btrfs: replace ma... |
4043 |
return submit_one_bio(READ, bio, 0, bio_flags); |
d1310b2e0 Btrfs: Split the ... |
4044 4045 |
return 0; } |
d1310b2e0 Btrfs: Split the ... |
4046 4047 4048 4049 4050 4051 4052 4053 4054 |
/* * basic invalidatepage code, this waits on any locked or writeback * ranges corresponding to the page, and then deletes any extent state * records from the tree */ int extent_invalidatepage(struct extent_io_tree *tree, struct page *page, unsigned long offset) { |
2ac55d41b Btrfs: cache the ... |
4055 |
struct extent_state *cached_state = NULL; |
4eee4fa4f Btrfs: use wrappe... |
4056 |
u64 start = page_offset(page); |
d1310b2e0 Btrfs: Split the ... |
4057 4058 |
u64 end = start + PAGE_CACHE_SIZE - 1; size_t blocksize = page->mapping->host->i_sb->s_blocksize; |
fda2832fe btrfs: cleanup fo... |
4059 |
start += ALIGN(offset, blocksize); |
d1310b2e0 Btrfs: Split the ... |
4060 4061 |
if (start > end) return 0; |
d0082371c btrfs: drop gfp_t... |
4062 |
lock_extent_bits(tree, start, end, 0, &cached_state); |
1edbb734b Btrfs: reduce CPU... |
4063 |
wait_on_page_writeback(page); |
d1310b2e0 Btrfs: Split the ... |
4064 |
clear_extent_bit(tree, start, end, |
32c00aff7 Btrfs: release de... |
4065 4066 |
EXTENT_LOCKED | EXTENT_DIRTY | EXTENT_DELALLOC | EXTENT_DO_ACCOUNTING, |
2ac55d41b Btrfs: cache the ... |
4067 |
1, 1, &cached_state, GFP_NOFS); |
d1310b2e0 Btrfs: Split the ... |
4068 4069 |
return 0; } |
d1310b2e0 Btrfs: Split the ... |
4070 4071 |
/* |
7b13b7b11 Btrfs: Don't drop... |
4072 4073 4074 4075 |
* a helper for releasepage, this tests for areas of the page that * are locked or under IO and drops the related state bits if it is safe * to drop the page. */ |
48a3b6366 btrfs: make stati... |
4076 4077 4078 |
static int try_release_extent_state(struct extent_map_tree *map, struct extent_io_tree *tree, struct page *page, gfp_t mask) |
7b13b7b11 Btrfs: Don't drop... |
4079 |
{ |
4eee4fa4f Btrfs: use wrappe... |
4080 |
u64 start = page_offset(page); |
7b13b7b11 Btrfs: Don't drop... |
4081 4082 |
u64 end = start + PAGE_CACHE_SIZE - 1; int ret = 1; |
211f90e68 Btrfs: Don't allo... |
4083 |
if (test_range_bit(tree, start, end, |
8b62b72b2 Btrfs: Use PagePr... |
4084 |
EXTENT_IOBITS, 0, NULL)) |
7b13b7b11 Btrfs: Don't drop... |
4085 4086 4087 4088 |
ret = 0; else { if ((mask & GFP_NOFS) == GFP_NOFS) mask = GFP_NOFS; |
11ef160fd Btrfs: fix releas... |
4089 4090 4091 4092 |
/* * at this point we can safely clear everything except the * locked bit and the nodatasum bit */ |
e3f24cc52 Btrfs: don't rele... |
4093 |
ret = clear_extent_bit(tree, start, end, |
11ef160fd Btrfs: fix releas... |
4094 4095 |
~(EXTENT_LOCKED | EXTENT_NODATASUM), 0, 0, NULL, mask); |
e3f24cc52 Btrfs: don't rele... |
4096 4097 4098 4099 4100 4101 4102 4103 |
/* if clear_extent_bit failed for enomem reasons, * we can't allow the release to continue. */ if (ret < 0) ret = 0; else ret = 1; |
7b13b7b11 Btrfs: Don't drop... |
4104 4105 4106 |
} return ret; } |
7b13b7b11 Btrfs: Don't drop... |
4107 4108 |
/* |
d1310b2e0 Btrfs: Split the ... |
4109 4110 4111 4112 4113 |
* a helper for releasepage. As long as there are no locked extents * in the range corresponding to the page, both state records and extent * map records are removed */ int try_release_extent_mapping(struct extent_map_tree *map, |
70dec8079 Btrfs: extent_io ... |
4114 4115 |
struct extent_io_tree *tree, struct page *page, gfp_t mask) |
d1310b2e0 Btrfs: Split the ... |
4116 4117 |
{ struct extent_map *em; |
4eee4fa4f Btrfs: use wrappe... |
4118 |
u64 start = page_offset(page); |
d1310b2e0 Btrfs: Split the ... |
4119 |
u64 end = start + PAGE_CACHE_SIZE - 1; |
7b13b7b11 Btrfs: Don't drop... |
4120 |
|
70dec8079 Btrfs: extent_io ... |
4121 4122 |
if ((mask & __GFP_WAIT) && page->mapping->host->i_size > 16 * 1024 * 1024) { |
39b5637f6 Btrfs: Fix "no cs... |
4123 |
u64 len; |
70dec8079 Btrfs: extent_io ... |
4124 |
while (start <= end) { |
39b5637f6 Btrfs: Fix "no cs... |
4125 |
len = end - start + 1; |
890871be8 Btrfs: switch ext... |
4126 |
write_lock(&map->lock); |
39b5637f6 Btrfs: Fix "no cs... |
4127 |
em = lookup_extent_mapping(map, start, len); |
285190d99 Btrfs: check retu... |
4128 |
if (!em) { |
890871be8 Btrfs: switch ext... |
4129 |
write_unlock(&map->lock); |
70dec8079 Btrfs: extent_io ... |
4130 4131 |
break; } |
7f3c74fb8 Btrfs: Keep exten... |
4132 4133 |
if (test_bit(EXTENT_FLAG_PINNED, &em->flags) || em->start != start) { |
890871be8 Btrfs: switch ext... |
4134 |
write_unlock(&map->lock); |
70dec8079 Btrfs: extent_io ... |
4135 4136 4137 4138 4139 |
free_extent_map(em); break; } if (!test_range_bit(tree, em->start, extent_map_end(em) - 1, |
8b62b72b2 Btrfs: Use PagePr... |
4140 |
EXTENT_LOCKED | EXTENT_WRITEBACK, |
9655d2982 Btrfs: use a cach... |
4141 |
0, NULL)) { |
70dec8079 Btrfs: extent_io ... |
4142 4143 4144 4145 4146 |
remove_extent_mapping(map, em); /* once for the rb tree */ free_extent_map(em); } start = extent_map_end(em); |
890871be8 Btrfs: switch ext... |
4147 |
write_unlock(&map->lock); |
70dec8079 Btrfs: extent_io ... |
4148 4149 |
/* once for us */ |
d1310b2e0 Btrfs: Split the ... |
4150 4151 |
free_extent_map(em); } |
d1310b2e0 Btrfs: Split the ... |
4152 |
} |
7b13b7b11 Btrfs: Don't drop... |
4153 |
return try_release_extent_state(map, tree, page, mask); |
d1310b2e0 Btrfs: Split the ... |
4154 |
} |
d1310b2e0 Btrfs: Split the ... |
4155 |
|
ec29ed5b4 Btrfs: fix fiemap... |
4156 4157 4158 4159 4160 4161 4162 4163 4164 4165 4166 4167 4168 4169 4170 |
/* * helper function for fiemap, which doesn't want to see any holes. * This maps until we find something past 'last' */ static struct extent_map *get_extent_skip_holes(struct inode *inode, u64 offset, u64 last, get_extent_t *get_extent) { u64 sectorsize = BTRFS_I(inode)->root->sectorsize; struct extent_map *em; u64 len; if (offset >= last) return NULL; |
678712545 btrfs: Fix checkp... |
4171 |
while (1) { |
ec29ed5b4 Btrfs: fix fiemap... |
4172 4173 4174 |
len = last - offset; if (len == 0) break; |
fda2832fe btrfs: cleanup fo... |
4175 |
len = ALIGN(len, sectorsize); |
ec29ed5b4 Btrfs: fix fiemap... |
4176 |
em = get_extent(inode, NULL, 0, offset, len, 0); |
c704005d8 btrfs: unify chec... |
4177 |
if (IS_ERR_OR_NULL(em)) |
ec29ed5b4 Btrfs: fix fiemap... |
4178 4179 4180 4181 4182 4183 4184 4185 4186 4187 4188 4189 4190 4191 4192 4193 |
return em; /* if this isn't a hole return it */ if (!test_bit(EXTENT_FLAG_VACANCY, &em->flags) && em->block_start != EXTENT_MAP_HOLE) { return em; } /* this is a hole, advance to the next extent */ offset = extent_map_end(em); free_extent_map(em); if (offset >= last) break; } return NULL; } |
1506fcc81 Btrfs: fiemap sup... |
4194 4195 4196 |
int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, __u64 start, __u64 len, get_extent_t *get_extent) { |
975f84fee Btrfs: fix fiemap |
4197 |
int ret = 0; |
1506fcc81 Btrfs: fiemap sup... |
4198 4199 4200 |
u64 off = start; u64 max = start + len; u32 flags = 0; |
975f84fee Btrfs: fix fiemap |
4201 4202 |
u32 found_type; u64 last; |
ec29ed5b4 Btrfs: fix fiemap... |
4203 |
u64 last_for_get_extent = 0; |
1506fcc81 Btrfs: fiemap sup... |
4204 |
u64 disko = 0; |
ec29ed5b4 Btrfs: fix fiemap... |
4205 |
u64 isize = i_size_read(inode); |
975f84fee Btrfs: fix fiemap |
4206 |
struct btrfs_key found_key; |
1506fcc81 Btrfs: fiemap sup... |
4207 |
struct extent_map *em = NULL; |
2ac55d41b Btrfs: cache the ... |
4208 |
struct extent_state *cached_state = NULL; |
975f84fee Btrfs: fix fiemap |
4209 |
struct btrfs_path *path; |
dc046b10c Btrfs: make fiema... |
4210 |
struct btrfs_root *root = BTRFS_I(inode)->root; |
1506fcc81 Btrfs: fiemap sup... |
4211 |
int end = 0; |
ec29ed5b4 Btrfs: fix fiemap... |
4212 4213 4214 |
u64 em_start = 0; u64 em_len = 0; u64 em_end = 0; |
1506fcc81 Btrfs: fiemap sup... |
4215 4216 4217 |
if (len == 0) return -EINVAL; |
975f84fee Btrfs: fix fiemap |
4218 4219 4220 4221 |
path = btrfs_alloc_path(); if (!path) return -ENOMEM; path->leave_spinning = 1; |
2c91943b5 btrfs: Return rig... |
4222 4223 |
start = round_down(start, BTRFS_I(inode)->root->sectorsize); len = round_up(max, BTRFS_I(inode)->root->sectorsize) - start; |
4d479cf01 Btrfs: sectorsize... |
4224 |
|
ec29ed5b4 Btrfs: fix fiemap... |
4225 4226 4227 4228 |
/* * lookup the last file extent. We're not using i_size here * because there might be preallocation past i_size */ |
dc046b10c Btrfs: make fiema... |
4229 4230 |
ret = btrfs_lookup_file_extent(NULL, root, path, btrfs_ino(inode), -1, 0); |
975f84fee Btrfs: fix fiemap |
4231 4232 4233 4234 4235 4236 |
if (ret < 0) { btrfs_free_path(path); return ret; } WARN_ON(!ret); path->slots[0]--; |
975f84fee Btrfs: fix fiemap |
4237 |
btrfs_item_key_to_cpu(path->nodes[0], &found_key, path->slots[0]); |
962a298f3 btrfs: kill the k... |
4238 |
found_type = found_key.type; |
975f84fee Btrfs: fix fiemap |
4239 |
|
ec29ed5b4 Btrfs: fix fiemap... |
4240 |
/* No extents, but there might be delalloc bits */ |
33345d015 Btrfs: Always use... |
4241 |
if (found_key.objectid != btrfs_ino(inode) || |
975f84fee Btrfs: fix fiemap |
4242 |
found_type != BTRFS_EXTENT_DATA_KEY) { |
ec29ed5b4 Btrfs: fix fiemap... |
4243 4244 4245 4246 4247 4248 4249 4250 4251 4252 4253 |
/* have to trust i_size as the end */ last = (u64)-1; last_for_get_extent = isize; } else { /* * remember the start of the last extent. There are a * bunch of different factors that go into the length of the * extent, so its much less complex to remember where it started */ last = found_key.offset; last_for_get_extent = last + 1; |
975f84fee Btrfs: fix fiemap |
4254 |
} |
fe09e16cc Btrfs: export btr... |
4255 |
btrfs_release_path(path); |
975f84fee Btrfs: fix fiemap |
4256 |
|
ec29ed5b4 Btrfs: fix fiemap... |
4257 4258 4259 4260 4261 4262 4263 4264 4265 |
/* * we might have some extents allocated but more delalloc past those * extents. so, we trust isize unless the start of the last extent is * beyond isize */ if (last < isize) { last = (u64)-1; last_for_get_extent = isize; } |
a52f4cd2b Btrfs: fix off-by... |
4266 |
lock_extent_bits(&BTRFS_I(inode)->io_tree, start, start + len - 1, 0, |
d0082371c btrfs: drop gfp_t... |
4267 |
&cached_state); |
ec29ed5b4 Btrfs: fix fiemap... |
4268 |
|
4d479cf01 Btrfs: sectorsize... |
4269 |
em = get_extent_skip_holes(inode, start, last_for_get_extent, |
ec29ed5b4 Btrfs: fix fiemap... |
4270 |
get_extent); |
1506fcc81 Btrfs: fiemap sup... |
4271 4272 4273 4274 4275 4276 |
if (!em) goto out; if (IS_ERR(em)) { ret = PTR_ERR(em); goto out; } |
975f84fee Btrfs: fix fiemap |
4277 |
|
1506fcc81 Btrfs: fiemap sup... |
4278 |
while (!end) { |
b76bb7013 Btrfs: do not off... |
4279 |
u64 offset_in_extent = 0; |
ea8efc74b Btrfs: make sure ... |
4280 4281 4282 4283 4284 4285 4286 4287 4288 4289 4290 4291 |
/* break if the extent we found is outside the range */ if (em->start >= max || extent_map_end(em) < off) break; /* * get_extent may return an extent that starts before our * requested range. We have to make sure the ranges * we return to fiemap always move forward and don't * overlap, so adjust the offsets here */ em_start = max(em->start, off); |
1506fcc81 Btrfs: fiemap sup... |
4292 |
|
ea8efc74b Btrfs: make sure ... |
4293 4294 |
/* * record the offset from the start of the extent |
b76bb7013 Btrfs: do not off... |
4295 4296 4297 |
* for adjusting the disk offset below. Only do this if the * extent isn't compressed since our in ram offset may be past * what we have actually allocated on disk. |
ea8efc74b Btrfs: make sure ... |
4298 |
*/ |
b76bb7013 Btrfs: do not off... |
4299 4300 |
if (!test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) offset_in_extent = em_start - em->start; |
ec29ed5b4 Btrfs: fix fiemap... |
4301 |
em_end = extent_map_end(em); |
ea8efc74b Btrfs: make sure ... |
4302 |
em_len = em_end - em_start; |
1506fcc81 Btrfs: fiemap sup... |
4303 4304 |
disko = 0; flags = 0; |
ea8efc74b Btrfs: make sure ... |
4305 4306 4307 4308 4309 4310 |
/* * bump off for our next call to get_extent */ off = extent_map_end(em); if (off >= max) end = 1; |
93dbfad7a Btrfs: fix __ucmp... |
4311 |
if (em->block_start == EXTENT_MAP_LAST_BYTE) { |
1506fcc81 Btrfs: fiemap sup... |
4312 4313 |
end = 1; flags |= FIEMAP_EXTENT_LAST; |
93dbfad7a Btrfs: fix __ucmp... |
4314 |
} else if (em->block_start == EXTENT_MAP_INLINE) { |
1506fcc81 Btrfs: fiemap sup... |
4315 4316 |
flags |= (FIEMAP_EXTENT_DATA_INLINE | FIEMAP_EXTENT_NOT_ALIGNED); |
93dbfad7a Btrfs: fix __ucmp... |
4317 |
} else if (em->block_start == EXTENT_MAP_DELALLOC) { |
1506fcc81 Btrfs: fiemap sup... |
4318 4319 |
flags |= (FIEMAP_EXTENT_DELALLOC | FIEMAP_EXTENT_UNKNOWN); |
dc046b10c Btrfs: make fiema... |
4320 4321 4322 |
} else if (fieinfo->fi_extents_max) { u64 bytenr = em->block_start - (em->start - em->orig_start); |
fe09e16cc Btrfs: export btr... |
4323 |
|
ea8efc74b Btrfs: make sure ... |
4324 |
disko = em->block_start + offset_in_extent; |
fe09e16cc Btrfs: export btr... |
4325 4326 4327 4328 |
/* * As btrfs supports shared space, this information * can be exported to userspace tools via |
dc046b10c Btrfs: make fiema... |
4329 4330 4331 |
* flag FIEMAP_EXTENT_SHARED. If fi_extents_max == 0 * then we're just getting a count and we can skip the * lookup stuff. |
fe09e16cc Btrfs: export btr... |
4332 |
*/ |
dc046b10c Btrfs: make fiema... |
4333 4334 4335 4336 |
ret = btrfs_check_shared(NULL, root->fs_info, root->objectid, btrfs_ino(inode), bytenr); if (ret < 0) |
fe09e16cc Btrfs: export btr... |
4337 |
goto out_free; |
dc046b10c Btrfs: make fiema... |
4338 |
if (ret) |
fe09e16cc Btrfs: export btr... |
4339 |
flags |= FIEMAP_EXTENT_SHARED; |
dc046b10c Btrfs: make fiema... |
4340 |
ret = 0; |
1506fcc81 Btrfs: fiemap sup... |
4341 4342 4343 |
} if (test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) flags |= FIEMAP_EXTENT_ENCODED; |
1506fcc81 Btrfs: fiemap sup... |
4344 4345 |
free_extent_map(em); em = NULL; |
ec29ed5b4 Btrfs: fix fiemap... |
4346 4347 |
if ((em_start >= last) || em_len == (u64)-1 || (last == (u64)-1 && isize <= em_end)) { |
1506fcc81 Btrfs: fiemap sup... |
4348 4349 4350 |
flags |= FIEMAP_EXTENT_LAST; end = 1; } |
ec29ed5b4 Btrfs: fix fiemap... |
4351 4352 4353 4354 4355 4356 4357 4358 |
/* now scan forward to see if this is really the last extent. */ em = get_extent_skip_holes(inode, off, last_for_get_extent, get_extent); if (IS_ERR(em)) { ret = PTR_ERR(em); goto out; } if (!em) { |
975f84fee Btrfs: fix fiemap |
4359 4360 4361 |
flags |= FIEMAP_EXTENT_LAST; end = 1; } |
ec29ed5b4 Btrfs: fix fiemap... |
4362 4363 4364 4365 |
ret = fiemap_fill_next_extent(fieinfo, em_start, disko, em_len, flags); if (ret) goto out_free; |
1506fcc81 Btrfs: fiemap sup... |
4366 4367 4368 4369 |
} out_free: free_extent_map(em); out: |
fe09e16cc Btrfs: export btr... |
4370 |
btrfs_free_path(path); |
a52f4cd2b Btrfs: fix off-by... |
4371 |
unlock_extent_cached(&BTRFS_I(inode)->io_tree, start, start + len - 1, |
2ac55d41b Btrfs: cache the ... |
4372 |
&cached_state, GFP_NOFS); |
1506fcc81 Btrfs: fiemap sup... |
4373 4374 |
return ret; } |
727011e07 Btrfs: allow meta... |
4375 4376 |
static void __free_extent_buffer(struct extent_buffer *eb) { |
6d49ba1b4 btrfs: move leak ... |
4377 |
btrfs_leak_debug_del(&eb->leak_list); |
727011e07 Btrfs: allow meta... |
4378 4379 |
kmem_cache_free(extent_buffer_cache, eb); } |
a26e8c9f7 Btrfs: don't clea... |
4380 |
int extent_buffer_under_io(struct extent_buffer *eb) |
db7f3436c Btrfs: deal with ... |
4381 4382 4383 4384 4385 4386 4387 4388 4389 |
{ return (atomic_read(&eb->io_pages) || test_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags) || test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)); } /* * Helper for releasing extent buffer page. */ |
a50924e3a btrfs: drop const... |
4390 |
static void btrfs_release_extent_buffer_page(struct extent_buffer *eb) |
db7f3436c Btrfs: deal with ... |
4391 4392 |
{ unsigned long index; |
db7f3436c Btrfs: deal with ... |
4393 4394 4395 4396 |
struct page *page; int mapped = !test_bit(EXTENT_BUFFER_DUMMY, &eb->bflags); BUG_ON(extent_buffer_under_io(eb)); |
a50924e3a btrfs: drop const... |
4397 4398 |
index = num_extent_pages(eb->start, eb->len); if (index == 0) |
db7f3436c Btrfs: deal with ... |
4399 4400 4401 4402 |
return; do { index--; |
fb85fc9a6 btrfs: kill exten... |
4403 |
page = eb->pages[index]; |
db7f3436c Btrfs: deal with ... |
4404 4405 4406 4407 4408 4409 4410 4411 4412 4413 4414 4415 4416 4417 4418 4419 4420 4421 4422 4423 4424 4425 4426 4427 4428 4429 4430 4431 4432 4433 |
if (page && mapped) { spin_lock(&page->mapping->private_lock); /* * We do this since we'll remove the pages after we've * removed the eb from the radix tree, so we could race * and have this page now attached to the new eb. So * only clear page_private if it's still connected to * this eb. */ if (PagePrivate(page) && page->private == (unsigned long)eb) { BUG_ON(test_bit(EXTENT_BUFFER_DIRTY, &eb->bflags)); BUG_ON(PageDirty(page)); BUG_ON(PageWriteback(page)); /* * We need to make sure we haven't be attached * to a new eb. */ ClearPagePrivate(page); set_page_private(page, 0); /* One for the page private */ page_cache_release(page); } spin_unlock(&page->mapping->private_lock); } if (page) { /* One for when we alloced the page */ page_cache_release(page); } |
a50924e3a btrfs: drop const... |
4434 |
} while (index != 0); |
db7f3436c Btrfs: deal with ... |
4435 4436 4437 4438 4439 4440 4441 |
} /* * Helper for releasing the extent buffer. */ static inline void btrfs_release_extent_buffer(struct extent_buffer *eb) { |
a50924e3a btrfs: drop const... |
4442 |
btrfs_release_extent_buffer_page(eb); |
db7f3436c Btrfs: deal with ... |
4443 4444 |
__free_extent_buffer(eb); } |
f28491e0a Btrfs: move the e... |
4445 4446 4447 |
static struct extent_buffer * __alloc_extent_buffer(struct btrfs_fs_info *fs_info, u64 start, unsigned long len, gfp_t mask) |
d1310b2e0 Btrfs: Split the ... |
4448 4449 |
{ struct extent_buffer *eb = NULL; |
d1310b2e0 Btrfs: Split the ... |
4450 |
eb = kmem_cache_zalloc(extent_buffer_cache, mask); |
91ca338d7 btrfs: check NULL... |
4451 4452 |
if (eb == NULL) return NULL; |
d1310b2e0 Btrfs: Split the ... |
4453 4454 |
eb->start = start; eb->len = len; |
f28491e0a Btrfs: move the e... |
4455 |
eb->fs_info = fs_info; |
815a51c74 Btrfs: dummy exte... |
4456 |
eb->bflags = 0; |
bd681513f Btrfs: switch the... |
4457 4458 4459 4460 4461 4462 4463 |
rwlock_init(&eb->lock); atomic_set(&eb->write_locks, 0); atomic_set(&eb->read_locks, 0); atomic_set(&eb->blocking_readers, 0); atomic_set(&eb->blocking_writers, 0); atomic_set(&eb->spinning_readers, 0); atomic_set(&eb->spinning_writers, 0); |
5b25f70f4 Btrfs: add nested... |
4464 |
eb->lock_nested = 0; |
bd681513f Btrfs: switch the... |
4465 4466 |
init_waitqueue_head(&eb->write_lock_wq); init_waitqueue_head(&eb->read_lock_wq); |
b4ce94de9 Btrfs: Change btr... |
4467 |
|
6d49ba1b4 btrfs: move leak ... |
4468 |
btrfs_leak_debug_add(&eb->leak_list, &buffers); |
3083ee2e1 Btrfs: introduce ... |
4469 |
spin_lock_init(&eb->refs_lock); |
d1310b2e0 Btrfs: Split the ... |
4470 |
atomic_set(&eb->refs, 1); |
0b32f4bbb Btrfs: ensure an ... |
4471 |
atomic_set(&eb->io_pages, 0); |
727011e07 Btrfs: allow meta... |
4472 |
|
b8dae3138 btrfs: use only i... |
4473 4474 4475 4476 4477 4478 |
/* * Sanity checks, currently the maximum is 64k covered by 16x 4k pages */ BUILD_BUG_ON(BTRFS_MAX_METADATA_BLOCKSIZE > MAX_INLINE_EXTENT_BUFFER_SIZE); BUG_ON(len > MAX_INLINE_EXTENT_BUFFER_SIZE); |
d1310b2e0 Btrfs: Split the ... |
4479 4480 4481 |
return eb; } |
815a51c74 Btrfs: dummy exte... |
4482 4483 4484 4485 4486 4487 |
struct extent_buffer *btrfs_clone_extent_buffer(struct extent_buffer *src) { unsigned long i; struct page *p; struct extent_buffer *new; unsigned long num_pages = num_extent_pages(src->start, src->len); |
9ec726775 Btrfs: stop using... |
4488 |
new = __alloc_extent_buffer(NULL, src->start, src->len, GFP_NOFS); |
815a51c74 Btrfs: dummy exte... |
4489 4490 4491 4492 |
if (new == NULL) return NULL; for (i = 0; i < num_pages; i++) { |
9ec726775 Btrfs: stop using... |
4493 |
p = alloc_page(GFP_NOFS); |
db7f3436c Btrfs: deal with ... |
4494 4495 4496 4497 |
if (!p) { btrfs_release_extent_buffer(new); return NULL; } |
815a51c74 Btrfs: dummy exte... |
4498 4499 4500 4501 4502 4503 4504 4505 4506 4507 4508 4509 4510 4511 4512 4513 4514 4515 |
attach_extent_buffer_page(new, p); WARN_ON(PageDirty(p)); SetPageUptodate(p); new->pages[i] = p; } copy_extent_buffer(new, src, 0, 0, src->len); set_bit(EXTENT_BUFFER_UPTODATE, &new->bflags); set_bit(EXTENT_BUFFER_DUMMY, &new->bflags); return new; } struct extent_buffer *alloc_dummy_extent_buffer(u64 start, unsigned long len) { struct extent_buffer *eb; unsigned long num_pages = num_extent_pages(0, len); unsigned long i; |
9ec726775 Btrfs: stop using... |
4516 |
eb = __alloc_extent_buffer(NULL, start, len, GFP_NOFS); |
815a51c74 Btrfs: dummy exte... |
4517 4518 4519 4520 |
if (!eb) return NULL; for (i = 0; i < num_pages; i++) { |
9ec726775 Btrfs: stop using... |
4521 |
eb->pages[i] = alloc_page(GFP_NOFS); |
815a51c74 Btrfs: dummy exte... |
4522 4523 4524 4525 4526 4527 4528 4529 4530 |
if (!eb->pages[i]) goto err; } set_extent_buffer_uptodate(eb); btrfs_set_header_nritems(eb, 0); set_bit(EXTENT_BUFFER_DUMMY, &eb->bflags); return eb; err: |
84167d190 Btrfs: Fix wrong ... |
4531 4532 |
for (; i > 0; i--) __free_page(eb->pages[i - 1]); |
815a51c74 Btrfs: dummy exte... |
4533 4534 4535 |
__free_extent_buffer(eb); return NULL; } |
0b32f4bbb Btrfs: ensure an ... |
4536 4537 |
static void check_buffer_tree_ref(struct extent_buffer *eb) { |
242e18c7c Btrfs: reduce loc... |
4538 |
int refs; |
0b32f4bbb Btrfs: ensure an ... |
4539 4540 4541 4542 4543 4544 4545 4546 4547 4548 4549 4550 4551 4552 4553 4554 4555 4556 4557 4558 |
/* the ref bit is tricky. We have to make sure it is set * if we have the buffer dirty. Otherwise the * code to free a buffer can end up dropping a dirty * page * * Once the ref bit is set, it won't go away while the * buffer is dirty or in writeback, and it also won't * go away while we have the reference count on the * eb bumped. * * We can't just set the ref bit without bumping the * ref on the eb because free_extent_buffer might * see the ref bit and try to clear it. If this happens * free_extent_buffer might end up dropping our original * ref by mistake and freeing the page before we are able * to add one more ref. * * So bump the ref count first, then set the bit. If someone * beat us to it, drop the ref we added. */ |
242e18c7c Btrfs: reduce loc... |
4559 4560 4561 |
refs = atomic_read(&eb->refs); if (refs >= 2 && test_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) return; |
594831c4b Btrfs: fix potent... |
4562 4563 |
spin_lock(&eb->refs_lock); if (!test_and_set_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) |
0b32f4bbb Btrfs: ensure an ... |
4564 |
atomic_inc(&eb->refs); |
594831c4b Btrfs: fix potent... |
4565 |
spin_unlock(&eb->refs_lock); |
0b32f4bbb Btrfs: ensure an ... |
4566 |
} |
2457aec63 mm: non-atomicall... |
4567 4568 |
static void mark_extent_buffer_accessed(struct extent_buffer *eb, struct page *accessed) |
5df4235ea Btrfs: introduce ... |
4569 4570 |
{ unsigned long num_pages, i; |
0b32f4bbb Btrfs: ensure an ... |
4571 |
check_buffer_tree_ref(eb); |
5df4235ea Btrfs: introduce ... |
4572 4573 |
num_pages = num_extent_pages(eb->start, eb->len); for (i = 0; i < num_pages; i++) { |
fb85fc9a6 btrfs: kill exten... |
4574 |
struct page *p = eb->pages[i]; |
2457aec63 mm: non-atomicall... |
4575 4576 |
if (p != accessed) mark_page_accessed(p); |
5df4235ea Btrfs: introduce ... |
4577 4578 |
} } |
f28491e0a Btrfs: move the e... |
4579 4580 |
struct extent_buffer *find_extent_buffer(struct btrfs_fs_info *fs_info, u64 start) |
452c75c3d Btrfs: Simplify t... |
4581 4582 4583 4584 |
{ struct extent_buffer *eb; rcu_read_lock(); |
f28491e0a Btrfs: move the e... |
4585 4586 |
eb = radix_tree_lookup(&fs_info->buffer_radix, start >> PAGE_CACHE_SHIFT); |
452c75c3d Btrfs: Simplify t... |
4587 4588 |
if (eb && atomic_inc_not_zero(&eb->refs)) { rcu_read_unlock(); |
2457aec63 mm: non-atomicall... |
4589 |
mark_extent_buffer_accessed(eb, NULL); |
452c75c3d Btrfs: Simplify t... |
4590 4591 4592 4593 4594 4595 |
return eb; } rcu_read_unlock(); return NULL; } |
faa2dbf00 Btrfs: add sanity... |
4596 4597 4598 4599 4600 4601 4602 4603 4604 4605 4606 4607 4608 4609 4610 4611 4612 4613 4614 4615 4616 4617 4618 4619 4620 4621 4622 4623 4624 4625 4626 4627 4628 4629 4630 4631 4632 4633 4634 4635 4636 4637 4638 4639 4640 4641 |
#ifdef CONFIG_BTRFS_FS_RUN_SANITY_TESTS struct extent_buffer *alloc_test_extent_buffer(struct btrfs_fs_info *fs_info, u64 start, unsigned long len) { struct extent_buffer *eb, *exists = NULL; int ret; eb = find_extent_buffer(fs_info, start); if (eb) return eb; eb = alloc_dummy_extent_buffer(start, len); if (!eb) return NULL; eb->fs_info = fs_info; again: ret = radix_tree_preload(GFP_NOFS & ~__GFP_HIGHMEM); if (ret) goto free_eb; spin_lock(&fs_info->buffer_lock); ret = radix_tree_insert(&fs_info->buffer_radix, start >> PAGE_CACHE_SHIFT, eb); spin_unlock(&fs_info->buffer_lock); radix_tree_preload_end(); if (ret == -EEXIST) { exists = find_extent_buffer(fs_info, start); if (exists) goto free_eb; else goto again; } check_buffer_tree_ref(eb); set_bit(EXTENT_BUFFER_IN_TREE, &eb->bflags); /* * We will free dummy extent buffer's if they come into * free_extent_buffer with a ref count of 2, but if we are using this we * want the buffers to stay in memory until we're done with them, so * bump the ref count again. */ atomic_inc(&eb->refs); return eb; free_eb: btrfs_release_extent_buffer(eb); return exists; } #endif |
f28491e0a Btrfs: move the e... |
4642 |
struct extent_buffer *alloc_extent_buffer(struct btrfs_fs_info *fs_info, |
727011e07 Btrfs: allow meta... |
4643 |
u64 start, unsigned long len) |
d1310b2e0 Btrfs: Split the ... |
4644 4645 4646 4647 4648 |
{ unsigned long num_pages = num_extent_pages(start, len); unsigned long i; unsigned long index = start >> PAGE_CACHE_SHIFT; struct extent_buffer *eb; |
6af118ce5 Btrfs: Index exte... |
4649 |
struct extent_buffer *exists = NULL; |
d1310b2e0 Btrfs: Split the ... |
4650 |
struct page *p; |
f28491e0a Btrfs: move the e... |
4651 |
struct address_space *mapping = fs_info->btree_inode->i_mapping; |
d1310b2e0 Btrfs: Split the ... |
4652 |
int uptodate = 1; |
19fe0a8b7 Btrfs: Switch the... |
4653 |
int ret; |
d1310b2e0 Btrfs: Split the ... |
4654 |
|
f28491e0a Btrfs: move the e... |
4655 |
eb = find_extent_buffer(fs_info, start); |
452c75c3d Btrfs: Simplify t... |
4656 |
if (eb) |
6af118ce5 Btrfs: Index exte... |
4657 |
return eb; |
6af118ce5 Btrfs: Index exte... |
4658 |
|
f28491e0a Btrfs: move the e... |
4659 |
eb = __alloc_extent_buffer(fs_info, start, len, GFP_NOFS); |
2b114d1d3 Btrfs: Correct us... |
4660 |
if (!eb) |
d1310b2e0 Btrfs: Split the ... |
4661 |
return NULL; |
727011e07 Btrfs: allow meta... |
4662 |
for (i = 0; i < num_pages; i++, index++) { |
a65917156 Btrfs: stop using... |
4663 |
p = find_or_create_page(mapping, index, GFP_NOFS); |
4804b3829 Btrfs: do not war... |
4664 |
if (!p) |
6af118ce5 Btrfs: Index exte... |
4665 |
goto free_eb; |
4f2de97ac Btrfs: set page->... |
4666 4667 4668 4669 4670 4671 4672 4673 4674 4675 4676 4677 4678 4679 |
spin_lock(&mapping->private_lock); if (PagePrivate(p)) { /* * We could have already allocated an eb for this page * and attached one so lets see if we can get a ref on * the existing eb, and if we can we know it's good and * we can just return that one, else we know we can just * overwrite page->private. */ exists = (struct extent_buffer *)p->private; if (atomic_inc_not_zero(&exists->refs)) { spin_unlock(&mapping->private_lock); unlock_page(p); |
17de39ac1 Btrfs: fix page l... |
4680 |
page_cache_release(p); |
2457aec63 mm: non-atomicall... |
4681 |
mark_extent_buffer_accessed(exists, p); |
4f2de97ac Btrfs: set page->... |
4682 4683 |
goto free_eb; } |
0b32f4bbb Btrfs: ensure an ... |
4684 |
/* |
4f2de97ac Btrfs: set page->... |
4685 4686 4687 4688 |
* Do this so attach doesn't complain and we need to * drop the ref the old guy had. */ ClearPagePrivate(p); |
0b32f4bbb Btrfs: ensure an ... |
4689 |
WARN_ON(PageDirty(p)); |
4f2de97ac Btrfs: set page->... |
4690 |
page_cache_release(p); |
d1310b2e0 Btrfs: Split the ... |
4691 |
} |
4f2de97ac Btrfs: set page->... |
4692 4693 |
attach_extent_buffer_page(eb, p); spin_unlock(&mapping->private_lock); |
0b32f4bbb Btrfs: ensure an ... |
4694 |
WARN_ON(PageDirty(p)); |
727011e07 Btrfs: allow meta... |
4695 |
eb->pages[i] = p; |
d1310b2e0 Btrfs: Split the ... |
4696 4697 |
if (!PageUptodate(p)) uptodate = 0; |
eb14ab8ed Btrfs: fix page->... |
4698 4699 4700 4701 4702 |
/* * see below about how we avoid a nasty race with release page * and why we unlock later */ |
d1310b2e0 Btrfs: Split the ... |
4703 4704 |
} if (uptodate) |
b4ce94de9 Btrfs: Change btr... |
4705 |
set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
115391d23 Btrfs: only use t... |
4706 |
again: |
19fe0a8b7 Btrfs: Switch the... |
4707 4708 4709 |
ret = radix_tree_preload(GFP_NOFS & ~__GFP_HIGHMEM); if (ret) goto free_eb; |
f28491e0a Btrfs: move the e... |
4710 4711 4712 4713 |
spin_lock(&fs_info->buffer_lock); ret = radix_tree_insert(&fs_info->buffer_radix, start >> PAGE_CACHE_SHIFT, eb); spin_unlock(&fs_info->buffer_lock); |
452c75c3d Btrfs: Simplify t... |
4714 |
radix_tree_preload_end(); |
19fe0a8b7 Btrfs: Switch the... |
4715 |
if (ret == -EEXIST) { |
f28491e0a Btrfs: move the e... |
4716 |
exists = find_extent_buffer(fs_info, start); |
452c75c3d Btrfs: Simplify t... |
4717 4718 4719 |
if (exists) goto free_eb; else |
115391d23 Btrfs: only use t... |
4720 |
goto again; |
6af118ce5 Btrfs: Index exte... |
4721 |
} |
6af118ce5 Btrfs: Index exte... |
4722 |
/* add one reference for the tree */ |
0b32f4bbb Btrfs: ensure an ... |
4723 |
check_buffer_tree_ref(eb); |
34b41acec Btrfs: use a bit ... |
4724 |
set_bit(EXTENT_BUFFER_IN_TREE, &eb->bflags); |
eb14ab8ed Btrfs: fix page->... |
4725 4726 4727 4728 4729 4730 4731 4732 4733 4734 |
/* * there is a race where release page may have * tried to find this extent buffer in the radix * but failed. It will tell the VM it is safe to * reclaim the, and it will clear the page private bit. * We must make sure to set the page private bit properly * after the extent buffer is in the radix tree so * it doesn't get lost */ |
727011e07 Btrfs: allow meta... |
4735 4736 |
SetPageChecked(eb->pages[0]); for (i = 1; i < num_pages; i++) { |
fb85fc9a6 btrfs: kill exten... |
4737 |
p = eb->pages[i]; |
727011e07 Btrfs: allow meta... |
4738 4739 4740 4741 |
ClearPageChecked(p); unlock_page(p); } unlock_page(eb->pages[0]); |
d1310b2e0 Btrfs: Split the ... |
4742 |
return eb; |
6af118ce5 Btrfs: Index exte... |
4743 |
free_eb: |
727011e07 Btrfs: allow meta... |
4744 4745 4746 4747 |
for (i = 0; i < num_pages; i++) { if (eb->pages[i]) unlock_page(eb->pages[i]); } |
eb14ab8ed Btrfs: fix page->... |
4748 |
|
17de39ac1 Btrfs: fix page l... |
4749 |
WARN_ON(!atomic_dec_and_test(&eb->refs)); |
897ca6e9b Btrfs: restructur... |
4750 |
btrfs_release_extent_buffer(eb); |
6af118ce5 Btrfs: Index exte... |
4751 |
return exists; |
d1310b2e0 Btrfs: Split the ... |
4752 |
} |
d1310b2e0 Btrfs: Split the ... |
4753 |
|
3083ee2e1 Btrfs: introduce ... |
4754 4755 4756 4757 4758 4759 4760 |
static inline void btrfs_release_extent_buffer_rcu(struct rcu_head *head) { struct extent_buffer *eb = container_of(head, struct extent_buffer, rcu_head); __free_extent_buffer(eb); } |
3083ee2e1 Btrfs: introduce ... |
4761 |
/* Expects to have eb->eb_lock already held */ |
f7a52a40c btrfs: remove unu... |
4762 |
static int release_extent_buffer(struct extent_buffer *eb) |
3083ee2e1 Btrfs: introduce ... |
4763 4764 4765 |
{ WARN_ON(atomic_read(&eb->refs) == 0); if (atomic_dec_and_test(&eb->refs)) { |
34b41acec Btrfs: use a bit ... |
4766 |
if (test_and_clear_bit(EXTENT_BUFFER_IN_TREE, &eb->bflags)) { |
f28491e0a Btrfs: move the e... |
4767 |
struct btrfs_fs_info *fs_info = eb->fs_info; |
3083ee2e1 Btrfs: introduce ... |
4768 |
|
815a51c74 Btrfs: dummy exte... |
4769 |
spin_unlock(&eb->refs_lock); |
3083ee2e1 Btrfs: introduce ... |
4770 |
|
f28491e0a Btrfs: move the e... |
4771 4772 |
spin_lock(&fs_info->buffer_lock); radix_tree_delete(&fs_info->buffer_radix, |
815a51c74 Btrfs: dummy exte... |
4773 |
eb->start >> PAGE_CACHE_SHIFT); |
f28491e0a Btrfs: move the e... |
4774 |
spin_unlock(&fs_info->buffer_lock); |
34b41acec Btrfs: use a bit ... |
4775 4776 |
} else { spin_unlock(&eb->refs_lock); |
815a51c74 Btrfs: dummy exte... |
4777 |
} |
3083ee2e1 Btrfs: introduce ... |
4778 4779 |
/* Should be safe to release our pages at this point */ |
a50924e3a btrfs: drop const... |
4780 |
btrfs_release_extent_buffer_page(eb); |
3083ee2e1 Btrfs: introduce ... |
4781 |
call_rcu(&eb->rcu_head, btrfs_release_extent_buffer_rcu); |
e64860aa0 Btrfs: don't retu... |
4782 |
return 1; |
3083ee2e1 Btrfs: introduce ... |
4783 4784 |
} spin_unlock(&eb->refs_lock); |
e64860aa0 Btrfs: don't retu... |
4785 4786 |
return 0; |
3083ee2e1 Btrfs: introduce ... |
4787 |
} |
d1310b2e0 Btrfs: Split the ... |
4788 4789 |
void free_extent_buffer(struct extent_buffer *eb) { |
242e18c7c Btrfs: reduce loc... |
4790 4791 |
int refs; int old; |
d1310b2e0 Btrfs: Split the ... |
4792 4793 |
if (!eb) return; |
242e18c7c Btrfs: reduce loc... |
4794 4795 4796 4797 4798 4799 4800 4801 |
while (1) { refs = atomic_read(&eb->refs); if (refs <= 3) break; old = atomic_cmpxchg(&eb->refs, refs, refs - 1); if (old == refs) return; } |
3083ee2e1 Btrfs: introduce ... |
4802 4803 |
spin_lock(&eb->refs_lock); if (atomic_read(&eb->refs) == 2 && |
815a51c74 Btrfs: dummy exte... |
4804 4805 4806 4807 |
test_bit(EXTENT_BUFFER_DUMMY, &eb->bflags)) atomic_dec(&eb->refs); if (atomic_read(&eb->refs) == 2 && |
3083ee2e1 Btrfs: introduce ... |
4808 |
test_bit(EXTENT_BUFFER_STALE, &eb->bflags) && |
0b32f4bbb Btrfs: ensure an ... |
4809 |
!extent_buffer_under_io(eb) && |
3083ee2e1 Btrfs: introduce ... |
4810 4811 4812 4813 4814 4815 4816 |
test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) atomic_dec(&eb->refs); /* * I know this is terrible, but it's temporary until we stop tracking * the uptodate bits and such for the extent buffers. */ |
f7a52a40c btrfs: remove unu... |
4817 |
release_extent_buffer(eb); |
3083ee2e1 Btrfs: introduce ... |
4818 4819 4820 4821 4822 |
} void free_extent_buffer_stale(struct extent_buffer *eb) { if (!eb) |
d1310b2e0 Btrfs: Split the ... |
4823 |
return; |
3083ee2e1 Btrfs: introduce ... |
4824 4825 |
spin_lock(&eb->refs_lock); set_bit(EXTENT_BUFFER_STALE, &eb->bflags); |
0b32f4bbb Btrfs: ensure an ... |
4826 |
if (atomic_read(&eb->refs) == 2 && !extent_buffer_under_io(eb) && |
3083ee2e1 Btrfs: introduce ... |
4827 4828 |
test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) atomic_dec(&eb->refs); |
f7a52a40c btrfs: remove unu... |
4829 |
release_extent_buffer(eb); |
d1310b2e0 Btrfs: Split the ... |
4830 |
} |
d1310b2e0 Btrfs: Split the ... |
4831 |
|
1d4284bd6 Merge branch 'err... |
4832 |
void clear_extent_buffer_dirty(struct extent_buffer *eb) |
d1310b2e0 Btrfs: Split the ... |
4833 |
{ |
d1310b2e0 Btrfs: Split the ... |
4834 4835 4836 |
unsigned long i; unsigned long num_pages; struct page *page; |
d1310b2e0 Btrfs: Split the ... |
4837 4838 4839 |
num_pages = num_extent_pages(eb->start, eb->len); for (i = 0; i < num_pages; i++) { |
fb85fc9a6 btrfs: kill exten... |
4840 |
page = eb->pages[i]; |
b9473439d Btrfs: leave btre... |
4841 |
if (!PageDirty(page)) |
d2c3f4f69 Btrfs: Avoid writ... |
4842 |
continue; |
a61e6f29d Btrfs: Use a mute... |
4843 |
lock_page(page); |
eb14ab8ed Btrfs: fix page->... |
4844 |
WARN_ON(!PagePrivate(page)); |
d1310b2e0 Btrfs: Split the ... |
4845 |
clear_page_dirty_for_io(page); |
0ee0fda06 Btrfs: Add compat... |
4846 |
spin_lock_irq(&page->mapping->tree_lock); |
d1310b2e0 Btrfs: Split the ... |
4847 4848 4849 4850 4851 |
if (!PageDirty(page)) { radix_tree_tag_clear(&page->mapping->page_tree, page_index(page), PAGECACHE_TAG_DIRTY); } |
0ee0fda06 Btrfs: Add compat... |
4852 |
spin_unlock_irq(&page->mapping->tree_lock); |
bf0da8c18 Btrfs: ClearPageE... |
4853 |
ClearPageError(page); |
a61e6f29d Btrfs: Use a mute... |
4854 |
unlock_page(page); |
d1310b2e0 Btrfs: Split the ... |
4855 |
} |
0b32f4bbb Btrfs: ensure an ... |
4856 |
WARN_ON(atomic_read(&eb->refs) == 0); |
d1310b2e0 Btrfs: Split the ... |
4857 |
} |
d1310b2e0 Btrfs: Split the ... |
4858 |
|
0b32f4bbb Btrfs: ensure an ... |
4859 |
int set_extent_buffer_dirty(struct extent_buffer *eb) |
d1310b2e0 Btrfs: Split the ... |
4860 4861 4862 |
{ unsigned long i; unsigned long num_pages; |
b9473439d Btrfs: leave btre... |
4863 |
int was_dirty = 0; |
d1310b2e0 Btrfs: Split the ... |
4864 |
|
0b32f4bbb Btrfs: ensure an ... |
4865 |
check_buffer_tree_ref(eb); |
b9473439d Btrfs: leave btre... |
4866 |
was_dirty = test_and_set_bit(EXTENT_BUFFER_DIRTY, &eb->bflags); |
0b32f4bbb Btrfs: ensure an ... |
4867 |
|
d1310b2e0 Btrfs: Split the ... |
4868 |
num_pages = num_extent_pages(eb->start, eb->len); |
3083ee2e1 Btrfs: introduce ... |
4869 |
WARN_ON(atomic_read(&eb->refs) == 0); |
0b32f4bbb Btrfs: ensure an ... |
4870 |
WARN_ON(!test_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)); |
b9473439d Btrfs: leave btre... |
4871 |
for (i = 0; i < num_pages; i++) |
fb85fc9a6 btrfs: kill exten... |
4872 |
set_page_dirty(eb->pages[i]); |
b9473439d Btrfs: leave btre... |
4873 |
return was_dirty; |
d1310b2e0 Btrfs: Split the ... |
4874 |
} |
d1310b2e0 Btrfs: Split the ... |
4875 |
|
0b32f4bbb Btrfs: ensure an ... |
4876 |
int clear_extent_buffer_uptodate(struct extent_buffer *eb) |
1259ab75c Btrfs: Handle wri... |
4877 4878 4879 4880 |
{ unsigned long i; struct page *page; unsigned long num_pages; |
b4ce94de9 Btrfs: Change btr... |
4881 |
clear_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
0b32f4bbb Btrfs: ensure an ... |
4882 |
num_pages = num_extent_pages(eb->start, eb->len); |
1259ab75c Btrfs: Handle wri... |
4883 |
for (i = 0; i < num_pages; i++) { |
fb85fc9a6 btrfs: kill exten... |
4884 |
page = eb->pages[i]; |
33958dc6d Btrfs: Fix verify... |
4885 4886 |
if (page) ClearPageUptodate(page); |
1259ab75c Btrfs: Handle wri... |
4887 4888 4889 |
} return 0; } |
0b32f4bbb Btrfs: ensure an ... |
4890 |
int set_extent_buffer_uptodate(struct extent_buffer *eb) |
d1310b2e0 Btrfs: Split the ... |
4891 4892 4893 4894 |
{ unsigned long i; struct page *page; unsigned long num_pages; |
0b32f4bbb Btrfs: ensure an ... |
4895 |
set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
d1310b2e0 Btrfs: Split the ... |
4896 |
num_pages = num_extent_pages(eb->start, eb->len); |
d1310b2e0 Btrfs: Split the ... |
4897 |
for (i = 0; i < num_pages; i++) { |
fb85fc9a6 btrfs: kill exten... |
4898 |
page = eb->pages[i]; |
d1310b2e0 Btrfs: Split the ... |
4899 4900 4901 4902 |
SetPageUptodate(page); } return 0; } |
d1310b2e0 Btrfs: Split the ... |
4903 |
|
0b32f4bbb Btrfs: ensure an ... |
4904 |
int extent_buffer_uptodate(struct extent_buffer *eb) |
d1310b2e0 Btrfs: Split the ... |
4905 |
{ |
0b32f4bbb Btrfs: ensure an ... |
4906 |
return test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
d1310b2e0 Btrfs: Split the ... |
4907 |
} |
d1310b2e0 Btrfs: Split the ... |
4908 4909 |
int read_extent_buffer_pages(struct extent_io_tree *tree, |
bb82ab88d btrfs: add an ext... |
4910 |
struct extent_buffer *eb, u64 start, int wait, |
f188591e9 Btrfs: Retry meta... |
4911 |
get_extent_t *get_extent, int mirror_num) |
d1310b2e0 Btrfs: Split the ... |
4912 4913 4914 4915 4916 4917 |
{ unsigned long i; unsigned long start_i; struct page *page; int err; int ret = 0; |
ce9adaa5a Btrfs: Do metadat... |
4918 4919 |
int locked_pages = 0; int all_uptodate = 1; |
d1310b2e0 Btrfs: Split the ... |
4920 |
unsigned long num_pages; |
727011e07 Btrfs: allow meta... |
4921 |
unsigned long num_reads = 0; |
a86c12c73 Btrfs: Create lar... |
4922 |
struct bio *bio = NULL; |
c8b978188 Btrfs: Add zlib c... |
4923 |
unsigned long bio_flags = 0; |
a86c12c73 Btrfs: Create lar... |
4924 |
|
b4ce94de9 Btrfs: Change btr... |
4925 |
if (test_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags)) |
d1310b2e0 Btrfs: Split the ... |
4926 |
return 0; |
d1310b2e0 Btrfs: Split the ... |
4927 4928 4929 4930 4931 4932 4933 4934 4935 4936 |
if (start) { WARN_ON(start < eb->start); start_i = (start >> PAGE_CACHE_SHIFT) - (eb->start >> PAGE_CACHE_SHIFT); } else { start_i = 0; } num_pages = num_extent_pages(eb->start, eb->len); for (i = start_i; i < num_pages; i++) { |
fb85fc9a6 btrfs: kill exten... |
4937 |
page = eb->pages[i]; |
bb82ab88d btrfs: add an ext... |
4938 |
if (wait == WAIT_NONE) { |
2db04966a Btrfs: Change Tes... |
4939 |
if (!trylock_page(page)) |
ce9adaa5a Btrfs: Do metadat... |
4940 |
goto unlock_exit; |
d1310b2e0 Btrfs: Split the ... |
4941 4942 4943 |
} else { lock_page(page); } |
ce9adaa5a Btrfs: Do metadat... |
4944 |
locked_pages++; |
727011e07 Btrfs: allow meta... |
4945 4946 |
if (!PageUptodate(page)) { num_reads++; |
ce9adaa5a Btrfs: Do metadat... |
4947 |
all_uptodate = 0; |
727011e07 Btrfs: allow meta... |
4948 |
} |
ce9adaa5a Btrfs: Do metadat... |
4949 4950 4951 |
} if (all_uptodate) { if (start_i == 0) |
b4ce94de9 Btrfs: Change btr... |
4952 |
set_bit(EXTENT_BUFFER_UPTODATE, &eb->bflags); |
ce9adaa5a Btrfs: Do metadat... |
4953 4954 |
goto unlock_exit; } |
656f30dba Btrfs: be aware o... |
4955 |
clear_bit(EXTENT_BUFFER_READ_ERR, &eb->bflags); |
5cf1ab561 Btrfs: always sto... |
4956 |
eb->read_mirror = 0; |
0b32f4bbb Btrfs: ensure an ... |
4957 |
atomic_set(&eb->io_pages, num_reads); |
ce9adaa5a Btrfs: Do metadat... |
4958 |
for (i = start_i; i < num_pages; i++) { |
fb85fc9a6 btrfs: kill exten... |
4959 |
page = eb->pages[i]; |
ce9adaa5a Btrfs: Do metadat... |
4960 |
if (!PageUptodate(page)) { |
f188591e9 Btrfs: Retry meta... |
4961 |
ClearPageError(page); |
a86c12c73 Btrfs: Create lar... |
4962 |
err = __extent_read_full_page(tree, page, |
f188591e9 Btrfs: Retry meta... |
4963 |
get_extent, &bio, |
d4c7ca86b Btrfs: use REQ_ME... |
4964 4965 |
mirror_num, &bio_flags, READ | REQ_META); |
d397712bc Btrfs: Fix checkp... |
4966 |
if (err) |
d1310b2e0 Btrfs: Split the ... |
4967 |
ret = err; |
d1310b2e0 Btrfs: Split the ... |
4968 4969 4970 4971 |
} else { unlock_page(page); } } |
355808c29 btrfs: ->submit_b... |
4972 |
if (bio) { |
d4c7ca86b Btrfs: use REQ_ME... |
4973 4974 |
err = submit_one_bio(READ | REQ_META, bio, mirror_num, bio_flags); |
79787eaab btrfs: replace ma... |
4975 4976 |
if (err) return err; |
355808c29 btrfs: ->submit_b... |
4977 |
} |
a86c12c73 Btrfs: Create lar... |
4978 |
|
bb82ab88d btrfs: add an ext... |
4979 |
if (ret || wait != WAIT_COMPLETE) |
d1310b2e0 Btrfs: Split the ... |
4980 |
return ret; |
d397712bc Btrfs: Fix checkp... |
4981 |
|
d1310b2e0 Btrfs: Split the ... |
4982 |
for (i = start_i; i < num_pages; i++) { |
fb85fc9a6 btrfs: kill exten... |
4983 |
page = eb->pages[i]; |
d1310b2e0 Btrfs: Split the ... |
4984 |
wait_on_page_locked(page); |
d397712bc Btrfs: Fix checkp... |
4985 |
if (!PageUptodate(page)) |
d1310b2e0 Btrfs: Split the ... |
4986 |
ret = -EIO; |
d1310b2e0 Btrfs: Split the ... |
4987 |
} |
d397712bc Btrfs: Fix checkp... |
4988 |
|
d1310b2e0 Btrfs: Split the ... |
4989 |
return ret; |
ce9adaa5a Btrfs: Do metadat... |
4990 4991 4992 |
unlock_exit: i = start_i; |
d397712bc Btrfs: Fix checkp... |
4993 |
while (locked_pages > 0) { |
fb85fc9a6 btrfs: kill exten... |
4994 |
page = eb->pages[i]; |
ce9adaa5a Btrfs: Do metadat... |
4995 4996 4997 4998 4999 |
i++; unlock_page(page); locked_pages--; } return ret; |
d1310b2e0 Btrfs: Split the ... |
5000 |
} |
d1310b2e0 Btrfs: Split the ... |
5001 5002 5003 5004 5005 5006 5007 5008 5009 5010 5011 5012 |
void read_extent_buffer(struct extent_buffer *eb, void *dstv, unsigned long start, unsigned long len) { size_t cur; size_t offset; struct page *page; char *kaddr; char *dst = (char *)dstv; size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; |
d1310b2e0 Btrfs: Split the ... |
5013 5014 5015 |
WARN_ON(start > eb->len); WARN_ON(start + len > eb->start + eb->len); |
778746b53 Btrfs: PAGE_CACHE... |
5016 |
offset = (start_offset + start) & (PAGE_CACHE_SIZE - 1); |
d1310b2e0 Btrfs: Split the ... |
5017 |
|
d397712bc Btrfs: Fix checkp... |
5018 |
while (len > 0) { |
fb85fc9a6 btrfs: kill exten... |
5019 |
page = eb->pages[i]; |
d1310b2e0 Btrfs: Split the ... |
5020 5021 |
cur = min(len, (PAGE_CACHE_SIZE - offset)); |
a65917156 Btrfs: stop using... |
5022 |
kaddr = page_address(page); |
d1310b2e0 Btrfs: Split the ... |
5023 |
memcpy(dst, kaddr + offset, cur); |
d1310b2e0 Btrfs: Split the ... |
5024 5025 5026 5027 5028 5029 5030 |
dst += cur; len -= cur; offset = 0; i++; } } |
d1310b2e0 Btrfs: Split the ... |
5031 |
|
550ac1d85 btrfs: new functi... |
5032 5033 5034 5035 5036 5037 5038 5039 5040 5041 5042 5043 5044 5045 5046 5047 5048 5049 5050 |
int read_extent_buffer_to_user(struct extent_buffer *eb, void __user *dstv, unsigned long start, unsigned long len) { size_t cur; size_t offset; struct page *page; char *kaddr; char __user *dst = (char __user *)dstv; size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; int ret = 0; WARN_ON(start > eb->len); WARN_ON(start + len > eb->start + eb->len); offset = (start_offset + start) & (PAGE_CACHE_SIZE - 1); while (len > 0) { |
fb85fc9a6 btrfs: kill exten... |
5051 |
page = eb->pages[i]; |
550ac1d85 btrfs: new functi... |
5052 5053 5054 5055 5056 5057 5058 5059 5060 5061 5062 5063 5064 5065 5066 5067 |
cur = min(len, (PAGE_CACHE_SIZE - offset)); kaddr = page_address(page); if (copy_to_user(dst, kaddr + offset, cur)) { ret = -EFAULT; break; } dst += cur; len -= cur; offset = 0; i++; } return ret; } |
d1310b2e0 Btrfs: Split the ... |
5068 |
int map_private_extent_buffer(struct extent_buffer *eb, unsigned long start, |
a65917156 Btrfs: stop using... |
5069 |
unsigned long min_len, char **map, |
d1310b2e0 Btrfs: Split the ... |
5070 |
unsigned long *map_start, |
a65917156 Btrfs: stop using... |
5071 |
unsigned long *map_len) |
d1310b2e0 Btrfs: Split the ... |
5072 5073 5074 5075 5076 5077 5078 5079 5080 5081 5082 5083 5084 5085 5086 5087 5088 5089 5090 |
{ size_t offset = start & (PAGE_CACHE_SIZE - 1); char *kaddr; struct page *p; size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; unsigned long end_i = (start_offset + start + min_len - 1) >> PAGE_CACHE_SHIFT; if (i != end_i) return -EINVAL; if (i == 0) { offset = start_offset; *map_start = 0; } else { offset = 0; *map_start = ((u64)i << PAGE_CACHE_SHIFT) - start_offset; } |
d397712bc Btrfs: Fix checkp... |
5091 |
|
d1310b2e0 Btrfs: Split the ... |
5092 |
if (start + min_len > eb->len) { |
31b1a2bd7 fs/btrfs: use WARN |
5093 |
WARN(1, KERN_ERR "btrfs bad mapping eb start %llu len %lu, " |
c1c9ff7c9 Btrfs: Remove sup... |
5094 5095 5096 |
"wanted %lu %lu ", eb->start, eb->len, start, min_len); |
850265335 Btrfs: return err... |
5097 |
return -EINVAL; |
d1310b2e0 Btrfs: Split the ... |
5098 |
} |
fb85fc9a6 btrfs: kill exten... |
5099 |
p = eb->pages[i]; |
a65917156 Btrfs: stop using... |
5100 |
kaddr = page_address(p); |
d1310b2e0 Btrfs: Split the ... |
5101 5102 5103 5104 |
*map = kaddr + offset; *map_len = PAGE_CACHE_SIZE - offset; return 0; } |
d1310b2e0 Btrfs: Split the ... |
5105 |
|
d1310b2e0 Btrfs: Split the ... |
5106 5107 5108 5109 5110 5111 5112 5113 5114 5115 5116 5117 5118 5119 5120 |
int memcmp_extent_buffer(struct extent_buffer *eb, const void *ptrv, unsigned long start, unsigned long len) { size_t cur; size_t offset; struct page *page; char *kaddr; char *ptr = (char *)ptrv; size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; int ret = 0; WARN_ON(start > eb->len); WARN_ON(start + len > eb->start + eb->len); |
778746b53 Btrfs: PAGE_CACHE... |
5121 |
offset = (start_offset + start) & (PAGE_CACHE_SIZE - 1); |
d1310b2e0 Btrfs: Split the ... |
5122 |
|
d397712bc Btrfs: Fix checkp... |
5123 |
while (len > 0) { |
fb85fc9a6 btrfs: kill exten... |
5124 |
page = eb->pages[i]; |
d1310b2e0 Btrfs: Split the ... |
5125 5126 |
cur = min(len, (PAGE_CACHE_SIZE - offset)); |
a65917156 Btrfs: stop using... |
5127 |
kaddr = page_address(page); |
d1310b2e0 Btrfs: Split the ... |
5128 |
ret = memcmp(ptr, kaddr + offset, cur); |
d1310b2e0 Btrfs: Split the ... |
5129 5130 5131 5132 5133 5134 5135 5136 5137 5138 |
if (ret) break; ptr += cur; len -= cur; offset = 0; i++; } return ret; } |
d1310b2e0 Btrfs: Split the ... |
5139 5140 5141 5142 5143 5144 5145 5146 5147 5148 5149 5150 5151 5152 |
void write_extent_buffer(struct extent_buffer *eb, const void *srcv, unsigned long start, unsigned long len) { size_t cur; size_t offset; struct page *page; char *kaddr; char *src = (char *)srcv; size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; WARN_ON(start > eb->len); WARN_ON(start + len > eb->start + eb->len); |
778746b53 Btrfs: PAGE_CACHE... |
5153 |
offset = (start_offset + start) & (PAGE_CACHE_SIZE - 1); |
d1310b2e0 Btrfs: Split the ... |
5154 |
|
d397712bc Btrfs: Fix checkp... |
5155 |
while (len > 0) { |
fb85fc9a6 btrfs: kill exten... |
5156 |
page = eb->pages[i]; |
d1310b2e0 Btrfs: Split the ... |
5157 5158 5159 |
WARN_ON(!PageUptodate(page)); cur = min(len, PAGE_CACHE_SIZE - offset); |
a65917156 Btrfs: stop using... |
5160 |
kaddr = page_address(page); |
d1310b2e0 Btrfs: Split the ... |
5161 |
memcpy(kaddr + offset, src, cur); |
d1310b2e0 Btrfs: Split the ... |
5162 5163 5164 5165 5166 5167 5168 |
src += cur; len -= cur; offset = 0; i++; } } |
d1310b2e0 Btrfs: Split the ... |
5169 5170 5171 5172 5173 5174 5175 5176 5177 5178 5179 5180 5181 |
void memset_extent_buffer(struct extent_buffer *eb, char c, unsigned long start, unsigned long len) { size_t cur; size_t offset; struct page *page; char *kaddr; size_t start_offset = eb->start & ((u64)PAGE_CACHE_SIZE - 1); unsigned long i = (start_offset + start) >> PAGE_CACHE_SHIFT; WARN_ON(start > eb->len); WARN_ON(start + len > eb->start + eb->len); |
778746b53 Btrfs: PAGE_CACHE... |
5182 |
offset = (start_offset + start) & (PAGE_CACHE_SIZE - 1); |
d1310b2e0 Btrfs: Split the ... |
5183 |
|
d397712bc Btrfs: Fix checkp... |
5184 |
while (len > 0) { |
fb85fc9a6 btrfs: kill exten... |
5185 |
page = eb->pages[i]; |
d1310b2e0 Btrfs: Split the ... |
5186 5187 5188 |
WARN_ON(!PageUptodate(page)); cur = min(len, PAGE_CACHE_SIZE - offset); |
a65917156 Btrfs: stop using... |
5189 |
kaddr = page_address(page); |
d1310b2e0 Btrfs: Split the ... |
5190 |
memset(kaddr + offset, c, cur); |
d1310b2e0 Btrfs: Split the ... |
5191 5192 5193 5194 5195 5196 |
len -= cur; offset = 0; i++; } } |
d1310b2e0 Btrfs: Split the ... |
5197 5198 5199 5200 5201 5202 5203 5204 5205 5206 5207 5208 5209 5210 5211 5212 |
void copy_extent_buffer(struct extent_buffer *dst, struct extent_buffer *src, unsigned long dst_offset, unsigned long src_offset, unsigned long len) { u64 dst_len = dst->len; size_t cur; size_t offset; struct page *page; char *kaddr; size_t start_offset = dst->start & ((u64)PAGE_CACHE_SIZE - 1); unsigned long i = (start_offset + dst_offset) >> PAGE_CACHE_SHIFT; WARN_ON(src->len != dst_len); offset = (start_offset + dst_offset) & |
778746b53 Btrfs: PAGE_CACHE... |
5213 |
(PAGE_CACHE_SIZE - 1); |
d1310b2e0 Btrfs: Split the ... |
5214 |
|
d397712bc Btrfs: Fix checkp... |
5215 |
while (len > 0) { |
fb85fc9a6 btrfs: kill exten... |
5216 |
page = dst->pages[i]; |
d1310b2e0 Btrfs: Split the ... |
5217 5218 5219 |
WARN_ON(!PageUptodate(page)); cur = min(len, (unsigned long)(PAGE_CACHE_SIZE - offset)); |
a65917156 Btrfs: stop using... |
5220 |
kaddr = page_address(page); |
d1310b2e0 Btrfs: Split the ... |
5221 |
read_extent_buffer(src, kaddr + offset, src_offset, cur); |
d1310b2e0 Btrfs: Split the ... |
5222 5223 5224 5225 5226 5227 5228 |
src_offset += cur; len -= cur; offset = 0; i++; } } |
d1310b2e0 Btrfs: Split the ... |
5229 |
|
3387206f2 btrfs: properly h... |
5230 5231 5232 5233 5234 |
static inline bool areas_overlap(unsigned long src, unsigned long dst, unsigned long len) { unsigned long distance = (src > dst) ? src - dst : dst - src; return distance < len; } |
d1310b2e0 Btrfs: Split the ... |
5235 5236 5237 5238 |
static void copy_pages(struct page *dst_page, struct page *src_page, unsigned long dst_off, unsigned long src_off, unsigned long len) { |
a65917156 Btrfs: stop using... |
5239 |
char *dst_kaddr = page_address(dst_page); |
d1310b2e0 Btrfs: Split the ... |
5240 |
char *src_kaddr; |
727011e07 Btrfs: allow meta... |
5241 |
int must_memmove = 0; |
d1310b2e0 Btrfs: Split the ... |
5242 |
|
3387206f2 btrfs: properly h... |
5243 |
if (dst_page != src_page) { |
a65917156 Btrfs: stop using... |
5244 |
src_kaddr = page_address(src_page); |
3387206f2 btrfs: properly h... |
5245 |
} else { |
d1310b2e0 Btrfs: Split the ... |
5246 |
src_kaddr = dst_kaddr; |
727011e07 Btrfs: allow meta... |
5247 5248 |
if (areas_overlap(src_off, dst_off, len)) must_memmove = 1; |
3387206f2 btrfs: properly h... |
5249 |
} |
d1310b2e0 Btrfs: Split the ... |
5250 |
|
727011e07 Btrfs: allow meta... |
5251 5252 5253 5254 |
if (must_memmove) memmove(dst_kaddr + dst_off, src_kaddr + src_off, len); else memcpy(dst_kaddr + dst_off, src_kaddr + src_off, len); |
d1310b2e0 Btrfs: Split the ... |
5255 5256 5257 5258 5259 5260 5261 5262 5263 5264 5265 5266 5267 |
} void memcpy_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, unsigned long src_offset, unsigned long len) { size_t cur; size_t dst_off_in_page; size_t src_off_in_page; size_t start_offset = dst->start & ((u64)PAGE_CACHE_SIZE - 1); unsigned long dst_i; unsigned long src_i; if (src_offset + len > dst->len) { |
efe120a06 Btrfs: convert pr... |
5268 |
printk(KERN_ERR "BTRFS: memmove bogus src_offset %lu move " |
d397712bc Btrfs: Fix checkp... |
5269 5270 |
"len %lu dst len %lu ", src_offset, len, dst->len); |
d1310b2e0 Btrfs: Split the ... |
5271 5272 5273 |
BUG_ON(1); } if (dst_offset + len > dst->len) { |
efe120a06 Btrfs: convert pr... |
5274 |
printk(KERN_ERR "BTRFS: memmove bogus dst_offset %lu move " |
d397712bc Btrfs: Fix checkp... |
5275 5276 |
"len %lu dst len %lu ", dst_offset, len, dst->len); |
d1310b2e0 Btrfs: Split the ... |
5277 5278 |
BUG_ON(1); } |
d397712bc Btrfs: Fix checkp... |
5279 |
while (len > 0) { |
d1310b2e0 Btrfs: Split the ... |
5280 |
dst_off_in_page = (start_offset + dst_offset) & |
778746b53 Btrfs: PAGE_CACHE... |
5281 |
(PAGE_CACHE_SIZE - 1); |
d1310b2e0 Btrfs: Split the ... |
5282 |
src_off_in_page = (start_offset + src_offset) & |
778746b53 Btrfs: PAGE_CACHE... |
5283 |
(PAGE_CACHE_SIZE - 1); |
d1310b2e0 Btrfs: Split the ... |
5284 5285 5286 5287 5288 5289 5290 5291 |
dst_i = (start_offset + dst_offset) >> PAGE_CACHE_SHIFT; src_i = (start_offset + src_offset) >> PAGE_CACHE_SHIFT; cur = min(len, (unsigned long)(PAGE_CACHE_SIZE - src_off_in_page)); cur = min_t(unsigned long, cur, (unsigned long)(PAGE_CACHE_SIZE - dst_off_in_page)); |
fb85fc9a6 btrfs: kill exten... |
5292 |
copy_pages(dst->pages[dst_i], dst->pages[src_i], |
d1310b2e0 Btrfs: Split the ... |
5293 5294 5295 5296 5297 5298 5299 |
dst_off_in_page, src_off_in_page, cur); src_offset += cur; dst_offset += cur; len -= cur; } } |
d1310b2e0 Btrfs: Split the ... |
5300 5301 5302 5303 5304 5305 5306 5307 5308 5309 5310 5311 5312 5313 |
void memmove_extent_buffer(struct extent_buffer *dst, unsigned long dst_offset, unsigned long src_offset, unsigned long len) { size_t cur; size_t dst_off_in_page; size_t src_off_in_page; unsigned long dst_end = dst_offset + len - 1; unsigned long src_end = src_offset + len - 1; size_t start_offset = dst->start & ((u64)PAGE_CACHE_SIZE - 1); unsigned long dst_i; unsigned long src_i; if (src_offset + len > dst->len) { |
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printk(KERN_ERR "BTRFS: memmove bogus src_offset %lu move " |
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"len %lu len %lu ", src_offset, len, dst->len); |
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BUG_ON(1); } if (dst_offset + len > dst->len) { |
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printk(KERN_ERR "BTRFS: memmove bogus dst_offset %lu move " |
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"len %lu len %lu ", dst_offset, len, dst->len); |
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BUG_ON(1); } |
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if (dst_offset < src_offset) { |
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memcpy_extent_buffer(dst, dst_offset, src_offset, len); return; } |
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while (len > 0) { |
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dst_i = (start_offset + dst_end) >> PAGE_CACHE_SHIFT; src_i = (start_offset + src_end) >> PAGE_CACHE_SHIFT; dst_off_in_page = (start_offset + dst_end) & |
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(PAGE_CACHE_SIZE - 1); |
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src_off_in_page = (start_offset + src_end) & |
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(PAGE_CACHE_SIZE - 1); |
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cur = min_t(unsigned long, len, src_off_in_page + 1); cur = min(cur, dst_off_in_page + 1); |
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copy_pages(dst->pages[dst_i], dst->pages[src_i], |
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dst_off_in_page - cur + 1, src_off_in_page - cur + 1, cur); dst_end -= cur; src_end -= cur; len -= cur; } } |
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|
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int try_release_extent_buffer(struct page *page) |
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{ |
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struct extent_buffer *eb; |
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|
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/* * We need to make sure noboody is attaching this page to an eb right * now. */ spin_lock(&page->mapping->private_lock); if (!PagePrivate(page)) { spin_unlock(&page->mapping->private_lock); |
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return 1; |
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} |
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|
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eb = (struct extent_buffer *)page->private; BUG_ON(!eb); |
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/* |
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* This is a little awful but should be ok, we need to make sure that * the eb doesn't disappear out from under us while we're looking at * this page. |
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*/ |
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spin_lock(&eb->refs_lock); |
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if (atomic_read(&eb->refs) != 1 || extent_buffer_under_io(eb)) { |
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spin_unlock(&eb->refs_lock); spin_unlock(&page->mapping->private_lock); return 0; |
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} |
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spin_unlock(&page->mapping->private_lock); |
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|
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/* |
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* If tree ref isn't set then we know the ref on this eb is a real ref, * so just return, this page will likely be freed soon anyway. |
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*/ |
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if (!test_and_clear_bit(EXTENT_BUFFER_TREE_REF, &eb->bflags)) { spin_unlock(&eb->refs_lock); return 0; |
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} |
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|
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return release_extent_buffer(eb); |
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} |