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fs/inode.c
42.9 KB
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/* |
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* (C) 1997 Linus Torvalds |
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* (C) 1999 Andrea Arcangeli <andrea@suse.de> (dynamic inode allocation) |
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*/ |
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#include <linux/fs.h> #include <linux/mm.h> #include <linux/dcache.h> #include <linux/init.h> |
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#include <linux/slab.h> #include <linux/writeback.h> #include <linux/module.h> #include <linux/backing-dev.h> #include <linux/wait.h> |
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#include <linux/rwsem.h> |
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#include <linux/hash.h> #include <linux/swap.h> #include <linux/security.h> #include <linux/pagemap.h> #include <linux/cdev.h> #include <linux/bootmem.h> |
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#include <linux/fsnotify.h> |
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#include <linux/mount.h> |
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#include <linux/async.h> |
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#include <linux/posix_acl.h> |
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#include <linux/prefetch.h> |
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#include <linux/ima.h> |
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#include <linux/cred.h> |
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#include <linux/buffer_head.h> /* for inode_has_buffers */ |
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#include "internal.h" |
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/* |
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* Inode locking rules: |
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* * inode->i_lock protects: * inode->i_state, inode->i_hash, __iget() |
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* inode->i_sb->s_inode_lru_lock protects: |
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* inode->i_sb->s_inode_lru, inode->i_lru |
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* inode_sb_list_lock protects: * sb->s_inodes, inode->i_sb_list |
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* bdi->wb.list_lock protects: |
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* bdi->wb.b_{dirty,io,more_io}, inode->i_wb_list |
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* inode_hash_lock protects: * inode_hashtable, inode->i_hash |
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* * Lock ordering: |
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* * inode_sb_list_lock * inode->i_lock |
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* inode->i_sb->s_inode_lru_lock |
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* |
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* bdi->wb.list_lock |
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* inode->i_lock |
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* * inode_hash_lock * inode_sb_list_lock * inode->i_lock * * iunique_lock * inode_hash_lock |
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*/ |
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static unsigned int i_hash_mask __read_mostly; static unsigned int i_hash_shift __read_mostly; |
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static struct hlist_head *inode_hashtable __read_mostly; static __cacheline_aligned_in_smp DEFINE_SPINLOCK(inode_hash_lock); |
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|
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__cacheline_aligned_in_smp DEFINE_SPINLOCK(inode_sb_list_lock); |
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/* |
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* Empty aops. Can be used for the cases where the user does not * define any of the address_space operations. */ const struct address_space_operations empty_aops = { }; EXPORT_SYMBOL(empty_aops); /* |
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* Statistics gathering.. */ struct inodes_stat_t inodes_stat; |
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static DEFINE_PER_CPU(unsigned int, nr_inodes); |
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static DEFINE_PER_CPU(unsigned int, nr_unused); |
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|
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static struct kmem_cache *inode_cachep __read_mostly; |
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|
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static int get_nr_inodes(void) |
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{ |
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int i; int sum = 0; for_each_possible_cpu(i) sum += per_cpu(nr_inodes, i); return sum < 0 ? 0 : sum; |
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} static inline int get_nr_inodes_unused(void) { |
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int i; int sum = 0; for_each_possible_cpu(i) sum += per_cpu(nr_unused, i); return sum < 0 ? 0 : sum; |
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} int get_nr_dirty_inodes(void) { |
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/* not actually dirty inodes, but a wild approximation */ |
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int nr_dirty = get_nr_inodes() - get_nr_inodes_unused(); return nr_dirty > 0 ? nr_dirty : 0; |
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} /* * Handle nr_inode sysctl */ #ifdef CONFIG_SYSCTL int proc_nr_inodes(ctl_table *table, int write, void __user *buffer, size_t *lenp, loff_t *ppos) { inodes_stat.nr_inodes = get_nr_inodes(); |
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inodes_stat.nr_unused = get_nr_inodes_unused(); |
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return proc_dointvec(table, write, buffer, lenp, ppos); } #endif |
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/** * inode_init_always - perform inode structure intialisation |
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* @sb: superblock inode belongs to * @inode: inode to initialise |
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* * These are initializations that need to be done on every inode * allocation as the fields are not initialised by slab allocation. */ |
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int inode_init_always(struct super_block *sb, struct inode *inode) |
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{ |
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static const struct inode_operations empty_iops; |
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static const struct file_operations empty_fops; |
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struct address_space *const mapping = &inode->i_data; |
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inode->i_sb = sb; inode->i_blkbits = sb->s_blocksize_bits; inode->i_flags = 0; atomic_set(&inode->i_count, 1); inode->i_op = &empty_iops; inode->i_fop = &empty_fops; inode->i_nlink = 1; |
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inode->i_opflags = 0; |
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inode->i_uid = 0; inode->i_gid = 0; |
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atomic_set(&inode->i_writecount, 0); inode->i_size = 0; inode->i_blocks = 0; inode->i_bytes = 0; inode->i_generation = 0; |
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#ifdef CONFIG_QUOTA |
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memset(&inode->i_dquot, 0, sizeof(inode->i_dquot)); |
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#endif |
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inode->i_pipe = NULL; inode->i_bdev = NULL; inode->i_cdev = NULL; inode->i_rdev = 0; inode->dirtied_when = 0; |
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if (security_inode_alloc(inode)) |
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goto out; |
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spin_lock_init(&inode->i_lock); lockdep_set_class(&inode->i_lock, &sb->s_type->i_lock_key); mutex_init(&inode->i_mutex); lockdep_set_class(&inode->i_mutex, &sb->s_type->i_mutex_key); |
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atomic_set(&inode->i_dio_count, 0); |
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mapping->a_ops = &empty_aops; mapping->host = inode; mapping->flags = 0; |
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mapping_set_gfp_mask(mapping, GFP_HIGHUSER_MOVABLE); |
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mapping->assoc_mapping = NULL; mapping->backing_dev_info = &default_backing_dev_info; mapping->writeback_index = 0; /* * If the block_device provides a backing_dev_info for client * inodes then use that. Otherwise the inode share the bdev's * backing_dev_info. */ if (sb->s_bdev) { struct backing_dev_info *bdi; |
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bdi = sb->s_bdev->bd_inode->i_mapping->backing_dev_info; |
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mapping->backing_dev_info = bdi; } inode->i_private = NULL; inode->i_mapping = mapping; |
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#ifdef CONFIG_FS_POSIX_ACL inode->i_acl = inode->i_default_acl = ACL_NOT_CACHED; #endif |
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|
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#ifdef CONFIG_FSNOTIFY inode->i_fsnotify_mask = 0; #endif |
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this_cpu_inc(nr_inodes); |
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|
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return 0; |
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out: return -ENOMEM; |
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} |
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EXPORT_SYMBOL(inode_init_always); static struct inode *alloc_inode(struct super_block *sb) { struct inode *inode; if (sb->s_op->alloc_inode) inode = sb->s_op->alloc_inode(sb); else inode = kmem_cache_alloc(inode_cachep, GFP_KERNEL); |
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if (!inode) return NULL; if (unlikely(inode_init_always(sb, inode))) { if (inode->i_sb->s_op->destroy_inode) inode->i_sb->s_op->destroy_inode(inode); else kmem_cache_free(inode_cachep, inode); return NULL; } return inode; |
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} |
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|
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void free_inode_nonrcu(struct inode *inode) { kmem_cache_free(inode_cachep, inode); } EXPORT_SYMBOL(free_inode_nonrcu); |
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void __destroy_inode(struct inode *inode) |
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{ |
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BUG_ON(inode_has_buffers(inode)); |
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security_inode_free(inode); |
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fsnotify_inode_delete(inode); |
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#ifdef CONFIG_FS_POSIX_ACL if (inode->i_acl && inode->i_acl != ACL_NOT_CACHED) posix_acl_release(inode->i_acl); if (inode->i_default_acl && inode->i_default_acl != ACL_NOT_CACHED) posix_acl_release(inode->i_default_acl); #endif |
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this_cpu_dec(nr_inodes); |
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} EXPORT_SYMBOL(__destroy_inode); |
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static void i_callback(struct rcu_head *head) { struct inode *inode = container_of(head, struct inode, i_rcu); INIT_LIST_HEAD(&inode->i_dentry); kmem_cache_free(inode_cachep, inode); } |
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static void destroy_inode(struct inode *inode) |
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{ |
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BUG_ON(!list_empty(&inode->i_lru)); |
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__destroy_inode(inode); |
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if (inode->i_sb->s_op->destroy_inode) inode->i_sb->s_op->destroy_inode(inode); else |
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call_rcu(&inode->i_rcu, i_callback); |
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} |
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|
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void address_space_init_once(struct address_space *mapping) { memset(mapping, 0, sizeof(*mapping)); INIT_RADIX_TREE(&mapping->page_tree, GFP_ATOMIC); spin_lock_init(&mapping->tree_lock); |
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mutex_init(&mapping->i_mmap_mutex); |
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INIT_LIST_HEAD(&mapping->private_list); spin_lock_init(&mapping->private_lock); INIT_RAW_PRIO_TREE_ROOT(&mapping->i_mmap); INIT_LIST_HEAD(&mapping->i_mmap_nonlinear); |
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} EXPORT_SYMBOL(address_space_init_once); |
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/* * These are initializations that only need to be done * once, because the fields are idempotent across use * of the inode, so let the slab aware of that. */ void inode_init_once(struct inode *inode) { memset(inode, 0, sizeof(*inode)); INIT_HLIST_NODE(&inode->i_hash); INIT_LIST_HEAD(&inode->i_dentry); INIT_LIST_HEAD(&inode->i_devices); |
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INIT_LIST_HEAD(&inode->i_wb_list); INIT_LIST_HEAD(&inode->i_lru); |
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address_space_init_once(&inode->i_data); |
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i_size_ordered_init(inode); |
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#ifdef CONFIG_FSNOTIFY |
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INIT_HLIST_HEAD(&inode->i_fsnotify_marks); |
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#endif |
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} |
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EXPORT_SYMBOL(inode_init_once); |
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static void init_once(void *foo) |
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{ |
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struct inode *inode = (struct inode *) foo; |
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|
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inode_init_once(inode); |
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} /* |
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* inode->i_lock must be held |
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*/ |
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void __iget(struct inode *inode) |
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{ |
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atomic_inc(&inode->i_count); } |
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|
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/* * get additional reference to inode; caller must already hold one. */ void ihold(struct inode *inode) { WARN_ON(atomic_inc_return(&inode->i_count) < 2); } EXPORT_SYMBOL(ihold); |
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static void inode_lru_list_add(struct inode *inode) { |
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spin_lock(&inode->i_sb->s_inode_lru_lock); |
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if (list_empty(&inode->i_lru)) { |
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list_add(&inode->i_lru, &inode->i_sb->s_inode_lru); inode->i_sb->s_nr_inodes_unused++; |
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this_cpu_inc(nr_unused); |
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} |
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spin_unlock(&inode->i_sb->s_inode_lru_lock); |
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} |
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|
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static void inode_lru_list_del(struct inode *inode) { |
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spin_lock(&inode->i_sb->s_inode_lru_lock); |
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if (!list_empty(&inode->i_lru)) { list_del_init(&inode->i_lru); |
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inode->i_sb->s_nr_inodes_unused--; |
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this_cpu_dec(nr_unused); |
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} |
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spin_unlock(&inode->i_sb->s_inode_lru_lock); |
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} |
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/** * inode_sb_list_add - add inode to the superblock list of inodes * @inode: inode to add */ void inode_sb_list_add(struct inode *inode) { |
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spin_lock(&inode_sb_list_lock); list_add(&inode->i_sb_list, &inode->i_sb->s_inodes); spin_unlock(&inode_sb_list_lock); |
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} EXPORT_SYMBOL_GPL(inode_sb_list_add); |
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static inline void inode_sb_list_del(struct inode *inode) |
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{ |
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if (!list_empty(&inode->i_sb_list)) { spin_lock(&inode_sb_list_lock); list_del_init(&inode->i_sb_list); spin_unlock(&inode_sb_list_lock); } |
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} |
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static unsigned long hash(struct super_block *sb, unsigned long hashval) { unsigned long tmp; tmp = (hashval * (unsigned long)sb) ^ (GOLDEN_RATIO_PRIME + hashval) / L1_CACHE_BYTES; |
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tmp = tmp ^ ((tmp ^ GOLDEN_RATIO_PRIME) >> i_hash_shift); return tmp & i_hash_mask; |
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} /** * __insert_inode_hash - hash an inode * @inode: unhashed inode * @hashval: unsigned long value used to locate this object in the * inode_hashtable. * * Add an inode to the inode hash for this superblock. */ void __insert_inode_hash(struct inode *inode, unsigned long hashval) { |
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struct hlist_head *b = inode_hashtable + hash(inode->i_sb, hashval); |
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spin_lock(&inode_hash_lock); |
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spin_lock(&inode->i_lock); |
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hlist_add_head(&inode->i_hash, b); |
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spin_unlock(&inode->i_lock); |
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spin_unlock(&inode_hash_lock); |
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} EXPORT_SYMBOL(__insert_inode_hash); /** |
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* __remove_inode_hash - remove an inode from the hash |
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* @inode: inode to unhash * * Remove an inode from the superblock. */ |
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void __remove_inode_hash(struct inode *inode) |
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{ |
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spin_lock(&inode_hash_lock); |
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spin_lock(&inode->i_lock); |
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hlist_del_init(&inode->i_hash); |
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spin_unlock(&inode->i_lock); |
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spin_unlock(&inode_hash_lock); |
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} |
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EXPORT_SYMBOL(__remove_inode_hash); |
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|
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void end_writeback(struct inode *inode) { might_sleep(); |
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/* * We have to cycle tree_lock here because reclaim can be still in the * process of removing the last page (in __delete_from_page_cache()) * and we must not free mapping under it. */ spin_lock_irq(&inode->i_data.tree_lock); |
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BUG_ON(inode->i_data.nrpages); |
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spin_unlock_irq(&inode->i_data.tree_lock); |
b0683aa63 new helper: end_w... |
411 412 413 414 |
BUG_ON(!list_empty(&inode->i_data.private_list)); BUG_ON(!(inode->i_state & I_FREEING)); BUG_ON(inode->i_state & I_CLEAR); inode_sync_wait(inode); |
fa0d7e3de fs: icache RCU fr... |
415 |
/* don't need i_lock here, no concurrent mods to i_state */ |
b0683aa63 new helper: end_w... |
416 417 418 |
inode->i_state = I_FREEING | I_CLEAR; } EXPORT_SYMBOL(end_writeback); |
b2b2af8e6 fs: factor inode ... |
419 420 421 422 423 424 425 426 427 428 429 430 431 |
/* * Free the inode passed in, removing it from the lists it is still connected * to. We remove any pages still attached to the inode and wait for any IO that * is still in progress before finally destroying the inode. * * An inode must already be marked I_FREEING so that we avoid the inode being * moved back onto lists if we race with other code that manipulates the lists * (e.g. writeback_single_inode). The caller is responsible for setting this. * * An inode must already be removed from the LRU list before being evicted from * the cache. This should occur atomically with setting the I_FREEING state * flag, so no inodes here should ever be on the LRU when being evicted. */ |
644da5960 fs/inode.c:evict(... |
432 |
static void evict(struct inode *inode) |
b4272d4c8 unify fs/inode.c ... |
433 434 |
{ const struct super_operations *op = inode->i_sb->s_op; |
b2b2af8e6 fs: factor inode ... |
435 436 |
BUG_ON(!(inode->i_state & I_FREEING)); BUG_ON(!list_empty(&inode->i_lru)); |
b12362bdb vfs: conditionall... |
437 438 |
if (!list_empty(&inode->i_wb_list)) inode_wb_list_del(inode); |
55fa6091d fs: move i_sb_lis... |
439 |
inode_sb_list_del(inode); |
be7ce4161 New method - evic... |
440 441 |
if (op->evict_inode) { op->evict_inode(inode); |
b4272d4c8 unify fs/inode.c ... |
442 443 444 |
} else { if (inode->i_data.nrpages) truncate_inode_pages(&inode->i_data, 0); |
30140837f fs/inode.c:clear_... |
445 |
end_writeback(inode); |
b4272d4c8 unify fs/inode.c ... |
446 |
} |
661074e91 Take ->i_bdev/->i... |
447 448 449 450 |
if (S_ISBLK(inode->i_mode) && inode->i_bdev) bd_forget(inode); if (S_ISCHR(inode->i_mode) && inode->i_cdev) cd_forget(inode); |
b2b2af8e6 fs: factor inode ... |
451 452 453 454 455 456 457 458 459 |
remove_inode_hash(inode); spin_lock(&inode->i_lock); wake_up_bit(&inode->i_state, __I_NEW); BUG_ON(inode->i_state != (I_FREEING | I_CLEAR)); spin_unlock(&inode->i_lock); destroy_inode(inode); |
b4272d4c8 unify fs/inode.c ... |
460 |
} |
1da177e4c Linux-2.6.12-rc2 |
461 462 463 464 465 466 467 468 469 |
/* * dispose_list - dispose of the contents of a local list * @head: the head of the list to free * * Dispose-list gets a local list with local inodes in it, so it doesn't * need to worry about list corruption and SMP locks. */ static void dispose_list(struct list_head *head) { |
1da177e4c Linux-2.6.12-rc2 |
470 471 |
while (!list_empty(head)) { struct inode *inode; |
7ccf19a80 fs: inode split I... |
472 473 |
inode = list_first_entry(head, struct inode, i_lru); list_del_init(&inode->i_lru); |
1da177e4c Linux-2.6.12-rc2 |
474 |
|
644da5960 fs/inode.c:evict(... |
475 |
evict(inode); |
1da177e4c Linux-2.6.12-rc2 |
476 |
} |
1da177e4c Linux-2.6.12-rc2 |
477 |
} |
a03187867 fs: fold invalida... |
478 |
/** |
63997e98a split invalidate_... |
479 480 481 482 483 484 485 |
* evict_inodes - evict all evictable inodes for a superblock * @sb: superblock to operate on * * Make sure that no inodes with zero refcount are retained. This is * called by superblock shutdown after having MS_ACTIVE flag removed, * so any inode reaching zero refcount during or after that call will * be immediately evicted. |
1da177e4c Linux-2.6.12-rc2 |
486 |
*/ |
63997e98a split invalidate_... |
487 |
void evict_inodes(struct super_block *sb) |
1da177e4c Linux-2.6.12-rc2 |
488 |
{ |
63997e98a split invalidate_... |
489 490 |
struct inode *inode, *next; LIST_HEAD(dispose); |
1da177e4c Linux-2.6.12-rc2 |
491 |
|
55fa6091d fs: move i_sb_lis... |
492 |
spin_lock(&inode_sb_list_lock); |
63997e98a split invalidate_... |
493 494 |
list_for_each_entry_safe(inode, next, &sb->s_inodes, i_sb_list) { if (atomic_read(&inode->i_count)) |
aabb8fdb4 fs: avoid I_NEW i... |
495 |
continue; |
250df6ed2 fs: protect inode... |
496 497 498 499 |
spin_lock(&inode->i_lock); if (inode->i_state & (I_NEW | I_FREEING | I_WILL_FREE)) { spin_unlock(&inode->i_lock); |
1da177e4c Linux-2.6.12-rc2 |
500 |
continue; |
250df6ed2 fs: protect inode... |
501 |
} |
63997e98a split invalidate_... |
502 503 |
inode->i_state |= I_FREEING; |
02afc410f fs: Lock the inod... |
504 |
inode_lru_list_del(inode); |
250df6ed2 fs: protect inode... |
505 |
spin_unlock(&inode->i_lock); |
02afc410f fs: Lock the inod... |
506 |
list_add(&inode->i_lru, &dispose); |
1da177e4c Linux-2.6.12-rc2 |
507 |
} |
55fa6091d fs: move i_sb_lis... |
508 |
spin_unlock(&inode_sb_list_lock); |
63997e98a split invalidate_... |
509 510 |
dispose_list(&dispose); |
1da177e4c Linux-2.6.12-rc2 |
511 |
} |
1da177e4c Linux-2.6.12-rc2 |
512 |
/** |
a03187867 fs: fold invalida... |
513 514 |
* invalidate_inodes - attempt to free all inodes on a superblock * @sb: superblock to operate on |
93b270f76 Fix over-zealous ... |
515 |
* @kill_dirty: flag to guide handling of dirty inodes |
1da177e4c Linux-2.6.12-rc2 |
516 |
* |
a03187867 fs: fold invalida... |
517 518 |
* Attempts to free all inodes for a given superblock. If there were any * busy inodes return a non-zero value, else zero. |
93b270f76 Fix over-zealous ... |
519 520 |
* If @kill_dirty is set, discard dirty inodes too, otherwise treat * them as busy. |
1da177e4c Linux-2.6.12-rc2 |
521 |
*/ |
93b270f76 Fix over-zealous ... |
522 |
int invalidate_inodes(struct super_block *sb, bool kill_dirty) |
1da177e4c Linux-2.6.12-rc2 |
523 |
{ |
cffbc8aa3 fs: Convert nr_in... |
524 |
int busy = 0; |
a03187867 fs: fold invalida... |
525 526 |
struct inode *inode, *next; LIST_HEAD(dispose); |
1da177e4c Linux-2.6.12-rc2 |
527 |
|
55fa6091d fs: move i_sb_lis... |
528 |
spin_lock(&inode_sb_list_lock); |
a03187867 fs: fold invalida... |
529 |
list_for_each_entry_safe(inode, next, &sb->s_inodes, i_sb_list) { |
250df6ed2 fs: protect inode... |
530 531 532 |
spin_lock(&inode->i_lock); if (inode->i_state & (I_NEW | I_FREEING | I_WILL_FREE)) { spin_unlock(&inode->i_lock); |
aabb8fdb4 fs: avoid I_NEW i... |
533 |
continue; |
250df6ed2 fs: protect inode... |
534 |
} |
93b270f76 Fix over-zealous ... |
535 |
if (inode->i_state & I_DIRTY && !kill_dirty) { |
250df6ed2 fs: protect inode... |
536 |
spin_unlock(&inode->i_lock); |
93b270f76 Fix over-zealous ... |
537 538 539 |
busy = 1; continue; } |
99a389192 fs: fix buffer in... |
540 |
if (atomic_read(&inode->i_count)) { |
250df6ed2 fs: protect inode... |
541 |
spin_unlock(&inode->i_lock); |
99a389192 fs: fix buffer in... |
542 |
busy = 1; |
1da177e4c Linux-2.6.12-rc2 |
543 544 |
continue; } |
99a389192 fs: fix buffer in... |
545 |
|
99a389192 fs: fix buffer in... |
546 |
inode->i_state |= I_FREEING; |
02afc410f fs: Lock the inod... |
547 |
inode_lru_list_del(inode); |
250df6ed2 fs: protect inode... |
548 |
spin_unlock(&inode->i_lock); |
02afc410f fs: Lock the inod... |
549 |
list_add(&inode->i_lru, &dispose); |
1da177e4c Linux-2.6.12-rc2 |
550 |
} |
55fa6091d fs: move i_sb_lis... |
551 |
spin_unlock(&inode_sb_list_lock); |
1da177e4c Linux-2.6.12-rc2 |
552 |
|
a03187867 fs: fold invalida... |
553 |
dispose_list(&dispose); |
1da177e4c Linux-2.6.12-rc2 |
554 555 556 |
return busy; } |
1da177e4c Linux-2.6.12-rc2 |
557 558 559 |
static int can_unuse(struct inode *inode) { |
9e38d86ff fs: Implement laz... |
560 |
if (inode->i_state & ~I_REFERENCED) |
1da177e4c Linux-2.6.12-rc2 |
561 562 563 564 565 566 567 568 569 570 571 |
return 0; if (inode_has_buffers(inode)) return 0; if (atomic_read(&inode->i_count)) return 0; if (inode->i_data.nrpages) return 0; return 1; } /* |
b0d40c92a superblock: intro... |
572 573 574 575 |
* Walk the superblock inode LRU for freeable inodes and attempt to free them. * This is called from the superblock shrinker function with a number of inodes * to trim from the LRU. Inodes to be freed are moved to a temporary list and * then are freed outside inode_lock by dispose_list(). |
1da177e4c Linux-2.6.12-rc2 |
576 577 |
* * Any inodes which are pinned purely because of attached pagecache have their |
9e38d86ff fs: Implement laz... |
578 579 |
* pagecache removed. If the inode has metadata buffers attached to * mapping->private_list then try to remove them. |
1da177e4c Linux-2.6.12-rc2 |
580 |
* |
9e38d86ff fs: Implement laz... |
581 582 583 584 585 586 587 |
* If the inode has the I_REFERENCED flag set, then it means that it has been * used recently - the flag is set in iput_final(). When we encounter such an * inode, clear the flag and move it to the back of the LRU so it gets another * pass through the LRU before it gets reclaimed. This is necessary because of * the fact we are doing lazy LRU updates to minimise lock contention so the * LRU does not have strict ordering. Hence we don't want to reclaim inodes * with this flag set because they are the inodes that are out of order. |
1da177e4c Linux-2.6.12-rc2 |
588 |
*/ |
b0d40c92a superblock: intro... |
589 |
void prune_icache_sb(struct super_block *sb, int nr_to_scan) |
1da177e4c Linux-2.6.12-rc2 |
590 591 |
{ LIST_HEAD(freeable); |
1da177e4c Linux-2.6.12-rc2 |
592 593 |
int nr_scanned; unsigned long reap = 0; |
09cc9fc7a inode: move to pe... |
594 |
spin_lock(&sb->s_inode_lru_lock); |
b0d40c92a superblock: intro... |
595 |
for (nr_scanned = nr_to_scan; nr_scanned >= 0; nr_scanned--) { |
1da177e4c Linux-2.6.12-rc2 |
596 |
struct inode *inode; |
98b745c64 inode: Make unuse... |
597 |
if (list_empty(&sb->s_inode_lru)) |
1da177e4c Linux-2.6.12-rc2 |
598 |
break; |
98b745c64 inode: Make unuse... |
599 |
inode = list_entry(sb->s_inode_lru.prev, struct inode, i_lru); |
1da177e4c Linux-2.6.12-rc2 |
600 |
|
9e38d86ff fs: Implement laz... |
601 |
/* |
09cc9fc7a inode: move to pe... |
602 |
* we are inverting the sb->s_inode_lru_lock/inode->i_lock here, |
02afc410f fs: Lock the inod... |
603 604 605 606 |
* so use a trylock. If we fail to get the lock, just move the * inode to the back of the list so we don't spin on it. */ if (!spin_trylock(&inode->i_lock)) { |
98b745c64 inode: Make unuse... |
607 |
list_move(&inode->i_lru, &sb->s_inode_lru); |
02afc410f fs: Lock the inod... |
608 609 610 611 |
continue; } /* |
9e38d86ff fs: Implement laz... |
612 613 614 615 616 |
* Referenced or dirty inodes are still in use. Give them * another pass through the LRU as we canot reclaim them now. */ if (atomic_read(&inode->i_count) || (inode->i_state & ~I_REFERENCED)) { |
7ccf19a80 fs: inode split I... |
617 |
list_del_init(&inode->i_lru); |
f283c86af fs: remove inode_... |
618 |
spin_unlock(&inode->i_lock); |
98b745c64 inode: Make unuse... |
619 |
sb->s_nr_inodes_unused--; |
fcb94f72d inode: convert in... |
620 |
this_cpu_dec(nr_unused); |
9e38d86ff fs: Implement laz... |
621 622 623 624 625 |
continue; } /* recently referenced inodes get one more pass */ if (inode->i_state & I_REFERENCED) { |
9e38d86ff fs: Implement laz... |
626 |
inode->i_state &= ~I_REFERENCED; |
98b745c64 inode: Make unuse... |
627 |
list_move(&inode->i_lru, &sb->s_inode_lru); |
f283c86af fs: remove inode_... |
628 |
spin_unlock(&inode->i_lock); |
1da177e4c Linux-2.6.12-rc2 |
629 630 631 632 |
continue; } if (inode_has_buffers(inode) || inode->i_data.nrpages) { __iget(inode); |
250df6ed2 fs: protect inode... |
633 |
spin_unlock(&inode->i_lock); |
09cc9fc7a inode: move to pe... |
634 |
spin_unlock(&sb->s_inode_lru_lock); |
1da177e4c Linux-2.6.12-rc2 |
635 |
if (remove_inode_buffers(inode)) |
fc0ecff69 [PATCH] remove in... |
636 637 |
reap += invalidate_mapping_pages(&inode->i_data, 0, -1); |
1da177e4c Linux-2.6.12-rc2 |
638 |
iput(inode); |
09cc9fc7a inode: move to pe... |
639 |
spin_lock(&sb->s_inode_lru_lock); |
1da177e4c Linux-2.6.12-rc2 |
640 |
|
98b745c64 inode: Make unuse... |
641 |
if (inode != list_entry(sb->s_inode_lru.next, |
7ccf19a80 fs: inode split I... |
642 |
struct inode, i_lru)) |
1da177e4c Linux-2.6.12-rc2 |
643 |
continue; /* wrong inode or list_empty */ |
02afc410f fs: Lock the inod... |
644 645 646 |
/* avoid lock inversions with trylock */ if (!spin_trylock(&inode->i_lock)) continue; |
250df6ed2 fs: protect inode... |
647 648 |
if (!can_unuse(inode)) { spin_unlock(&inode->i_lock); |
1da177e4c Linux-2.6.12-rc2 |
649 |
continue; |
250df6ed2 fs: protect inode... |
650 |
} |
1da177e4c Linux-2.6.12-rc2 |
651 |
} |
7ef0d7377 fs: new inode i_s... |
652 |
WARN_ON(inode->i_state & I_NEW); |
1da177e4c Linux-2.6.12-rc2 |
653 |
inode->i_state |= I_FREEING; |
250df6ed2 fs: protect inode... |
654 |
spin_unlock(&inode->i_lock); |
7ccf19a80 fs: inode split I... |
655 |
|
7ccf19a80 fs: inode split I... |
656 |
list_move(&inode->i_lru, &freeable); |
98b745c64 inode: Make unuse... |
657 |
sb->s_nr_inodes_unused--; |
fcb94f72d inode: convert in... |
658 |
this_cpu_dec(nr_unused); |
1da177e4c Linux-2.6.12-rc2 |
659 |
} |
f8891e5e1 [PATCH] Light wei... |
660 661 662 663 |
if (current_is_kswapd()) __count_vm_events(KSWAPD_INODESTEAL, reap); else __count_vm_events(PGINODESTEAL, reap); |
09cc9fc7a inode: move to pe... |
664 |
spin_unlock(&sb->s_inode_lru_lock); |
1da177e4c Linux-2.6.12-rc2 |
665 666 |
dispose_list(&freeable); |
1da177e4c Linux-2.6.12-rc2 |
667 |
} |
1da177e4c Linux-2.6.12-rc2 |
668 669 670 |
static void __wait_on_freeing_inode(struct inode *inode); /* * Called with the inode lock held. |
1da177e4c Linux-2.6.12-rc2 |
671 |
*/ |
6b3304b53 Make checkpatch.p... |
672 673 674 675 |
static struct inode *find_inode(struct super_block *sb, struct hlist_head *head, int (*test)(struct inode *, void *), void *data) |
1da177e4c Linux-2.6.12-rc2 |
676 677 |
{ struct hlist_node *node; |
6b3304b53 Make checkpatch.p... |
678 |
struct inode *inode = NULL; |
1da177e4c Linux-2.6.12-rc2 |
679 680 |
repeat: |
c5c8be3ce fs/inode.c: use h... |
681 |
hlist_for_each_entry(inode, node, head, i_hash) { |
67a23c494 fs: rename inode_... |
682 683 684 |
spin_lock(&inode->i_lock); if (inode->i_sb != sb) { spin_unlock(&inode->i_lock); |
1da177e4c Linux-2.6.12-rc2 |
685 |
continue; |
67a23c494 fs: rename inode_... |
686 687 688 |
} if (!test(inode, data)) { spin_unlock(&inode->i_lock); |
1da177e4c Linux-2.6.12-rc2 |
689 |
continue; |
67a23c494 fs: rename inode_... |
690 |
} |
a4ffdde6e simplify checks f... |
691 |
if (inode->i_state & (I_FREEING|I_WILL_FREE)) { |
1da177e4c Linux-2.6.12-rc2 |
692 693 694 |
__wait_on_freeing_inode(inode); goto repeat; } |
f7899bd54 fs: move i_count ... |
695 |
__iget(inode); |
250df6ed2 fs: protect inode... |
696 |
spin_unlock(&inode->i_lock); |
f7899bd54 fs: move i_count ... |
697 |
return inode; |
1da177e4c Linux-2.6.12-rc2 |
698 |
} |
f7899bd54 fs: move i_count ... |
699 |
return NULL; |
1da177e4c Linux-2.6.12-rc2 |
700 701 702 703 704 705 |
} /* * find_inode_fast is the fast path version of find_inode, see the comment at * iget_locked for details. */ |
6b3304b53 Make checkpatch.p... |
706 707 |
static struct inode *find_inode_fast(struct super_block *sb, struct hlist_head *head, unsigned long ino) |
1da177e4c Linux-2.6.12-rc2 |
708 709 |
{ struct hlist_node *node; |
6b3304b53 Make checkpatch.p... |
710 |
struct inode *inode = NULL; |
1da177e4c Linux-2.6.12-rc2 |
711 712 |
repeat: |
c5c8be3ce fs/inode.c: use h... |
713 |
hlist_for_each_entry(inode, node, head, i_hash) { |
67a23c494 fs: rename inode_... |
714 715 716 |
spin_lock(&inode->i_lock); if (inode->i_ino != ino) { spin_unlock(&inode->i_lock); |
1da177e4c Linux-2.6.12-rc2 |
717 |
continue; |
67a23c494 fs: rename inode_... |
718 719 720 |
} if (inode->i_sb != sb) { spin_unlock(&inode->i_lock); |
1da177e4c Linux-2.6.12-rc2 |
721 |
continue; |
67a23c494 fs: rename inode_... |
722 |
} |
a4ffdde6e simplify checks f... |
723 |
if (inode->i_state & (I_FREEING|I_WILL_FREE)) { |
1da177e4c Linux-2.6.12-rc2 |
724 725 726 |
__wait_on_freeing_inode(inode); goto repeat; } |
f7899bd54 fs: move i_count ... |
727 |
__iget(inode); |
250df6ed2 fs: protect inode... |
728 |
spin_unlock(&inode->i_lock); |
f7899bd54 fs: move i_count ... |
729 |
return inode; |
1da177e4c Linux-2.6.12-rc2 |
730 |
} |
f7899bd54 fs: move i_count ... |
731 |
return NULL; |
8290c35f8 Inode: Allow exte... |
732 |
} |
f991bd2e1 fs: introduce a p... |
733 734 735 736 |
/* * Each cpu owns a range of LAST_INO_BATCH numbers. * 'shared_last_ino' is dirtied only once out of LAST_INO_BATCH allocations, * to renew the exhausted range. |
8290c35f8 Inode: Allow exte... |
737 |
* |
f991bd2e1 fs: introduce a p... |
738 739 740 741 742 743 744 745 746 |
* This does not significantly increase overflow rate because every CPU can * consume at most LAST_INO_BATCH-1 unused inode numbers. So there is * NR_CPUS*(LAST_INO_BATCH-1) wastage. At 4096 and 1024, this is ~0.1% of the * 2^32 range, and is a worst-case. Even a 50% wastage would only increase * overflow rate by 2x, which does not seem too significant. * * On a 32bit, non LFS stat() call, glibc will generate an EOVERFLOW * error if st_ino won't fit in target struct field. Use 32bit counter * here to attempt to avoid that. |
8290c35f8 Inode: Allow exte... |
747 |
*/ |
f991bd2e1 fs: introduce a p... |
748 749 |
#define LAST_INO_BATCH 1024 static DEFINE_PER_CPU(unsigned int, last_ino); |
85fe4025c fs: do not assign... |
750 |
unsigned int get_next_ino(void) |
8290c35f8 Inode: Allow exte... |
751 |
{ |
f991bd2e1 fs: introduce a p... |
752 753 |
unsigned int *p = &get_cpu_var(last_ino); unsigned int res = *p; |
8290c35f8 Inode: Allow exte... |
754 |
|
f991bd2e1 fs: introduce a p... |
755 756 757 758 759 760 761 762 763 764 765 766 |
#ifdef CONFIG_SMP if (unlikely((res & (LAST_INO_BATCH-1)) == 0)) { static atomic_t shared_last_ino; int next = atomic_add_return(LAST_INO_BATCH, &shared_last_ino); res = next - LAST_INO_BATCH; } #endif *p = ++res; put_cpu_var(last_ino); return res; |
8290c35f8 Inode: Allow exte... |
767 |
} |
85fe4025c fs: do not assign... |
768 |
EXPORT_SYMBOL(get_next_ino); |
8290c35f8 Inode: Allow exte... |
769 |
|
1da177e4c Linux-2.6.12-rc2 |
770 |
/** |
a209dfc7b vfs: dont chain p... |
771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 |
* new_inode_pseudo - obtain an inode * @sb: superblock * * Allocates a new inode for given superblock. * Inode wont be chained in superblock s_inodes list * This means : * - fs can't be unmount * - quotas, fsnotify, writeback can't work */ struct inode *new_inode_pseudo(struct super_block *sb) { struct inode *inode = alloc_inode(sb); if (inode) { spin_lock(&inode->i_lock); inode->i_state = 0; spin_unlock(&inode->i_lock); INIT_LIST_HEAD(&inode->i_sb_list); } return inode; } /** |
1da177e4c Linux-2.6.12-rc2 |
794 795 796 |
* new_inode - obtain an inode * @sb: superblock * |
769848c03 Add __GFP_MOVABLE... |
797 |
* Allocates a new inode for given superblock. The default gfp_mask |
3c1d43787 mm: remove GFP_HI... |
798 |
* for allocations related to inode->i_mapping is GFP_HIGHUSER_MOVABLE. |
769848c03 Add __GFP_MOVABLE... |
799 800 801 802 803 |
* If HIGHMEM pages are unsuitable or it is known that pages allocated * for the page cache are not reclaimable or migratable, * mapping_set_gfp_mask() must be called with suitable flags on the * newly created inode's mapping * |
1da177e4c Linux-2.6.12-rc2 |
804 805 806 |
*/ struct inode *new_inode(struct super_block *sb) { |
6b3304b53 Make checkpatch.p... |
807 |
struct inode *inode; |
1da177e4c Linux-2.6.12-rc2 |
808 |
|
55fa6091d fs: move i_sb_lis... |
809 |
spin_lock_prefetch(&inode_sb_list_lock); |
6b3304b53 Make checkpatch.p... |
810 |
|
a209dfc7b vfs: dont chain p... |
811 812 |
inode = new_inode_pseudo(sb); if (inode) |
55fa6091d fs: move i_sb_lis... |
813 |
inode_sb_list_add(inode); |
1da177e4c Linux-2.6.12-rc2 |
814 815 |
return inode; } |
1da177e4c Linux-2.6.12-rc2 |
816 |
EXPORT_SYMBOL(new_inode); |
14358e6dd lockdep: annotate... |
817 |
#ifdef CONFIG_DEBUG_LOCK_ALLOC |
e096d0c7e lockdep: Add help... |
818 819 |
void lockdep_annotate_inode_mutex_key(struct inode *inode) { |
a3314a0ed lockdep: fixup ch... |
820 |
if (S_ISDIR(inode->i_mode)) { |
1e89a5e15 lockdep: fixup th... |
821 |
struct file_system_type *type = inode->i_sb->s_type; |
9a7aa12f3 vfs: Set special ... |
822 823 824 825 826 827 828 829 830 831 832 |
/* Set new key only if filesystem hasn't already changed it */ if (!lockdep_match_class(&inode->i_mutex, &type->i_mutex_key)) { /* * ensure nobody is actually holding i_mutex */ mutex_destroy(&inode->i_mutex); mutex_init(&inode->i_mutex); lockdep_set_class(&inode->i_mutex, &type->i_mutex_dir_key); } |
1e89a5e15 lockdep: fixup th... |
833 |
} |
e096d0c7e lockdep: Add help... |
834 835 |
} EXPORT_SYMBOL(lockdep_annotate_inode_mutex_key); |
14358e6dd lockdep: annotate... |
836 |
#endif |
e096d0c7e lockdep: Add help... |
837 838 839 840 841 842 843 844 845 846 847 |
/** * unlock_new_inode - clear the I_NEW state and wake up any waiters * @inode: new inode to unlock * * Called when the inode is fully initialised to clear the new state of the * inode and wake up anyone waiting for the inode to finish initialisation. */ void unlock_new_inode(struct inode *inode) { lockdep_annotate_inode_mutex_key(inode); |
250df6ed2 fs: protect inode... |
848 |
spin_lock(&inode->i_lock); |
eaff8079d kill I_LOCK |
849 850 |
WARN_ON(!(inode->i_state & I_NEW)); inode->i_state &= ~I_NEW; |
250df6ed2 fs: protect inode... |
851 852 |
wake_up_bit(&inode->i_state, __I_NEW); spin_unlock(&inode->i_lock); |
1da177e4c Linux-2.6.12-rc2 |
853 |
} |
1da177e4c Linux-2.6.12-rc2 |
854 |
EXPORT_SYMBOL(unlock_new_inode); |
0b2d0724e fs: simplify iget... |
855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 |
/** * iget5_locked - obtain an inode from a mounted file system * @sb: super block of file system * @hashval: hash value (usually inode number) to get * @test: callback used for comparisons between inodes * @set: callback used to initialize a new struct inode * @data: opaque data pointer to pass to @test and @set * * Search for the inode specified by @hashval and @data in the inode cache, * and if present it is return it with an increased reference count. This is * a generalized version of iget_locked() for file systems where the inode * number is not sufficient for unique identification of an inode. * * If the inode is not in cache, allocate a new inode and return it locked, * hashed, and with the I_NEW flag set. The file system gets to fill it in * before unlocking it via unlock_new_inode(). |
1da177e4c Linux-2.6.12-rc2 |
871 |
* |
0b2d0724e fs: simplify iget... |
872 873 |
* Note both @test and @set are called with the inode_hash_lock held, so can't * sleep. |
1da177e4c Linux-2.6.12-rc2 |
874 |
*/ |
0b2d0724e fs: simplify iget... |
875 876 877 |
struct inode *iget5_locked(struct super_block *sb, unsigned long hashval, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *data) |
1da177e4c Linux-2.6.12-rc2 |
878 |
{ |
0b2d0724e fs: simplify iget... |
879 |
struct hlist_head *head = inode_hashtable + hash(sb, hashval); |
6b3304b53 Make checkpatch.p... |
880 |
struct inode *inode; |
1da177e4c Linux-2.6.12-rc2 |
881 |
|
0b2d0724e fs: simplify iget... |
882 883 884 885 886 887 888 889 |
spin_lock(&inode_hash_lock); inode = find_inode(sb, head, test, data); spin_unlock(&inode_hash_lock); if (inode) { wait_on_inode(inode); return inode; } |
1da177e4c Linux-2.6.12-rc2 |
890 891 |
inode = alloc_inode(sb); if (inode) { |
6b3304b53 Make checkpatch.p... |
892 |
struct inode *old; |
1da177e4c Linux-2.6.12-rc2 |
893 |
|
67a23c494 fs: rename inode_... |
894 |
spin_lock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
895 896 897 898 899 |
/* We released the lock, so.. */ old = find_inode(sb, head, test, data); if (!old) { if (set(inode, data)) goto set_failed; |
250df6ed2 fs: protect inode... |
900 901 |
spin_lock(&inode->i_lock); inode->i_state = I_NEW; |
646ec4615 fs: remove inode_... |
902 |
hlist_add_head(&inode->i_hash, head); |
250df6ed2 fs: protect inode... |
903 |
spin_unlock(&inode->i_lock); |
55fa6091d fs: move i_sb_lis... |
904 |
inode_sb_list_add(inode); |
67a23c494 fs: rename inode_... |
905 |
spin_unlock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
906 907 908 909 910 911 912 913 914 915 916 917 |
/* Return the locked inode with I_NEW set, the * caller is responsible for filling in the contents */ return inode; } /* * Uhhuh, somebody else created the same inode under * us. Use the old inode instead of the one we just * allocated. */ |
67a23c494 fs: rename inode_... |
918 |
spin_unlock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
919 920 921 922 923 924 925 |
destroy_inode(inode); inode = old; wait_on_inode(inode); } return inode; set_failed: |
67a23c494 fs: rename inode_... |
926 |
spin_unlock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
927 928 929 |
destroy_inode(inode); return NULL; } |
0b2d0724e fs: simplify iget... |
930 |
EXPORT_SYMBOL(iget5_locked); |
1da177e4c Linux-2.6.12-rc2 |
931 |
|
0b2d0724e fs: simplify iget... |
932 933 934 935 936 937 938 939 940 941 942 943 |
/** * iget_locked - obtain an inode from a mounted file system * @sb: super block of file system * @ino: inode number to get * * Search for the inode specified by @ino in the inode cache and if present * return it with an increased reference count. This is for file systems * where the inode number is sufficient for unique identification of an inode. * * If the inode is not in cache, allocate a new inode and return it locked, * hashed, and with the I_NEW flag set. The file system gets to fill it in * before unlocking it via unlock_new_inode(). |
1da177e4c Linux-2.6.12-rc2 |
944 |
*/ |
0b2d0724e fs: simplify iget... |
945 |
struct inode *iget_locked(struct super_block *sb, unsigned long ino) |
1da177e4c Linux-2.6.12-rc2 |
946 |
{ |
0b2d0724e fs: simplify iget... |
947 |
struct hlist_head *head = inode_hashtable + hash(sb, ino); |
6b3304b53 Make checkpatch.p... |
948 |
struct inode *inode; |
1da177e4c Linux-2.6.12-rc2 |
949 |
|
0b2d0724e fs: simplify iget... |
950 951 952 953 954 955 956 |
spin_lock(&inode_hash_lock); inode = find_inode_fast(sb, head, ino); spin_unlock(&inode_hash_lock); if (inode) { wait_on_inode(inode); return inode; } |
1da177e4c Linux-2.6.12-rc2 |
957 958 |
inode = alloc_inode(sb); if (inode) { |
6b3304b53 Make checkpatch.p... |
959 |
struct inode *old; |
1da177e4c Linux-2.6.12-rc2 |
960 |
|
67a23c494 fs: rename inode_... |
961 |
spin_lock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
962 963 964 965 |
/* We released the lock, so.. */ old = find_inode_fast(sb, head, ino); if (!old) { inode->i_ino = ino; |
250df6ed2 fs: protect inode... |
966 967 |
spin_lock(&inode->i_lock); inode->i_state = I_NEW; |
646ec4615 fs: remove inode_... |
968 |
hlist_add_head(&inode->i_hash, head); |
250df6ed2 fs: protect inode... |
969 |
spin_unlock(&inode->i_lock); |
55fa6091d fs: move i_sb_lis... |
970 |
inode_sb_list_add(inode); |
67a23c494 fs: rename inode_... |
971 |
spin_unlock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
972 973 974 975 976 977 978 979 980 981 982 983 |
/* Return the locked inode with I_NEW set, the * caller is responsible for filling in the contents */ return inode; } /* * Uhhuh, somebody else created the same inode under * us. Use the old inode instead of the one we just * allocated. */ |
67a23c494 fs: rename inode_... |
984 |
spin_unlock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
985 986 987 988 989 990 |
destroy_inode(inode); inode = old; wait_on_inode(inode); } return inode; } |
0b2d0724e fs: simplify iget... |
991 |
EXPORT_SYMBOL(iget_locked); |
1da177e4c Linux-2.6.12-rc2 |
992 |
|
ad5e195ac fs: Stop abusing ... |
993 994 995 996 997 998 999 1000 1001 1002 1003 1004 |
/* * search the inode cache for a matching inode number. * If we find one, then the inode number we are trying to * allocate is not unique and so we should not use it. * * Returns 1 if the inode number is unique, 0 if it is not. */ static int test_inode_iunique(struct super_block *sb, unsigned long ino) { struct hlist_head *b = inode_hashtable + hash(sb, ino); struct hlist_node *node; struct inode *inode; |
67a23c494 fs: rename inode_... |
1005 |
spin_lock(&inode_hash_lock); |
ad5e195ac fs: Stop abusing ... |
1006 |
hlist_for_each_entry(inode, node, b, i_hash) { |
67a23c494 fs: rename inode_... |
1007 1008 |
if (inode->i_ino == ino && inode->i_sb == sb) { spin_unlock(&inode_hash_lock); |
ad5e195ac fs: Stop abusing ... |
1009 |
return 0; |
67a23c494 fs: rename inode_... |
1010 |
} |
ad5e195ac fs: Stop abusing ... |
1011 |
} |
67a23c494 fs: rename inode_... |
1012 |
spin_unlock(&inode_hash_lock); |
ad5e195ac fs: Stop abusing ... |
1013 1014 1015 |
return 1; } |
1da177e4c Linux-2.6.12-rc2 |
1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 |
/** * iunique - get a unique inode number * @sb: superblock * @max_reserved: highest reserved inode number * * Obtain an inode number that is unique on the system for a given * superblock. This is used by file systems that have no natural * permanent inode numbering system. An inode number is returned that * is higher than the reserved limit but unique. * * BUGS: * With a large number of inodes live on the file system this function * currently becomes quite slow. */ ino_t iunique(struct super_block *sb, ino_t max_reserved) { |
866b04fcc inode numbering: ... |
1032 1033 1034 1035 1036 |
/* * On a 32bit, non LFS stat() call, glibc will generate an EOVERFLOW * error if st_ino won't fit in target struct field. Use 32bit counter * here to attempt to avoid that. */ |
ad5e195ac fs: Stop abusing ... |
1037 |
static DEFINE_SPINLOCK(iunique_lock); |
866b04fcc inode numbering: ... |
1038 |
static unsigned int counter; |
1da177e4c Linux-2.6.12-rc2 |
1039 |
ino_t res; |
3361c7beb make iunique use ... |
1040 |
|
ad5e195ac fs: Stop abusing ... |
1041 |
spin_lock(&iunique_lock); |
3361c7beb make iunique use ... |
1042 1043 1044 |
do { if (counter <= max_reserved) counter = max_reserved + 1; |
1da177e4c Linux-2.6.12-rc2 |
1045 |
res = counter++; |
ad5e195ac fs: Stop abusing ... |
1046 1047 |
} while (!test_inode_iunique(sb, res)); spin_unlock(&iunique_lock); |
1da177e4c Linux-2.6.12-rc2 |
1048 |
|
3361c7beb make iunique use ... |
1049 1050 |
return res; } |
1da177e4c Linux-2.6.12-rc2 |
1051 1052 1053 1054 |
EXPORT_SYMBOL(iunique); struct inode *igrab(struct inode *inode) { |
250df6ed2 fs: protect inode... |
1055 1056 |
spin_lock(&inode->i_lock); if (!(inode->i_state & (I_FREEING|I_WILL_FREE))) { |
1da177e4c Linux-2.6.12-rc2 |
1057 |
__iget(inode); |
250df6ed2 fs: protect inode... |
1058 1059 1060 |
spin_unlock(&inode->i_lock); } else { spin_unlock(&inode->i_lock); |
1da177e4c Linux-2.6.12-rc2 |
1061 1062 1063 1064 1065 1066 |
/* * Handle the case where s_op->clear_inode is not been * called yet, and somebody is calling igrab * while the inode is getting freed. */ inode = NULL; |
250df6ed2 fs: protect inode... |
1067 |
} |
1da177e4c Linux-2.6.12-rc2 |
1068 1069 |
return inode; } |
1da177e4c Linux-2.6.12-rc2 |
1070 1071 1072 |
EXPORT_SYMBOL(igrab); /** |
0b2d0724e fs: simplify iget... |
1073 |
* ilookup5_nowait - search for an inode in the inode cache |
1da177e4c Linux-2.6.12-rc2 |
1074 |
* @sb: super block of file system to search |
0b2d0724e fs: simplify iget... |
1075 |
* @hashval: hash value (usually inode number) to search for |
1da177e4c Linux-2.6.12-rc2 |
1076 1077 |
* @test: callback used for comparisons between inodes * @data: opaque data pointer to pass to @test |
1da177e4c Linux-2.6.12-rc2 |
1078 |
* |
0b2d0724e fs: simplify iget... |
1079 |
* Search for the inode specified by @hashval and @data in the inode cache. |
1da177e4c Linux-2.6.12-rc2 |
1080 1081 1082 |
* If the inode is in the cache, the inode is returned with an incremented * reference count. * |
0b2d0724e fs: simplify iget... |
1083 1084 |
* Note: I_NEW is not waited upon so you have to be very careful what you do * with the returned inode. You probably should be using ilookup5() instead. |
1da177e4c Linux-2.6.12-rc2 |
1085 |
* |
b6d0ad686 fs: fix inode.c k... |
1086 |
* Note2: @test is called with the inode_hash_lock held, so can't sleep. |
1da177e4c Linux-2.6.12-rc2 |
1087 |
*/ |
0b2d0724e fs: simplify iget... |
1088 1089 |
struct inode *ilookup5_nowait(struct super_block *sb, unsigned long hashval, int (*test)(struct inode *, void *), void *data) |
1da177e4c Linux-2.6.12-rc2 |
1090 |
{ |
0b2d0724e fs: simplify iget... |
1091 |
struct hlist_head *head = inode_hashtable + hash(sb, hashval); |
1da177e4c Linux-2.6.12-rc2 |
1092 |
struct inode *inode; |
67a23c494 fs: rename inode_... |
1093 |
spin_lock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
1094 |
inode = find_inode(sb, head, test, data); |
67a23c494 fs: rename inode_... |
1095 |
spin_unlock(&inode_hash_lock); |
88bd5121d [PATCH] Fix soft ... |
1096 |
|
0b2d0724e fs: simplify iget... |
1097 |
return inode; |
88bd5121d [PATCH] Fix soft ... |
1098 |
} |
88bd5121d [PATCH] Fix soft ... |
1099 1100 1101 1102 1103 1104 1105 1106 1107 |
EXPORT_SYMBOL(ilookup5_nowait); /** * ilookup5 - search for an inode in the inode cache * @sb: super block of file system to search * @hashval: hash value (usually inode number) to search for * @test: callback used for comparisons between inodes * @data: opaque data pointer to pass to @test * |
0b2d0724e fs: simplify iget... |
1108 1109 1110 |
* Search for the inode specified by @hashval and @data in the inode cache, * and if the inode is in the cache, return the inode with an incremented * reference count. Waits on I_NEW before returning the inode. |
88bd5121d [PATCH] Fix soft ... |
1111 |
* returned with an incremented reference count. |
1da177e4c Linux-2.6.12-rc2 |
1112 |
* |
0b2d0724e fs: simplify iget... |
1113 1114 |
* This is a generalized version of ilookup() for file systems where the * inode number is not sufficient for unique identification of an inode. |
1da177e4c Linux-2.6.12-rc2 |
1115 |
* |
0b2d0724e fs: simplify iget... |
1116 |
* Note: @test is called with the inode_hash_lock held, so can't sleep. |
1da177e4c Linux-2.6.12-rc2 |
1117 1118 1119 1120 |
*/ struct inode *ilookup5(struct super_block *sb, unsigned long hashval, int (*test)(struct inode *, void *), void *data) { |
0b2d0724e fs: simplify iget... |
1121 |
struct inode *inode = ilookup5_nowait(sb, hashval, test, data); |
1da177e4c Linux-2.6.12-rc2 |
1122 |
|
0b2d0724e fs: simplify iget... |
1123 1124 1125 |
if (inode) wait_on_inode(inode); return inode; |
1da177e4c Linux-2.6.12-rc2 |
1126 |
} |
1da177e4c Linux-2.6.12-rc2 |
1127 1128 1129 1130 1131 1132 1133 |
EXPORT_SYMBOL(ilookup5); /** * ilookup - search for an inode in the inode cache * @sb: super block of file system to search * @ino: inode number to search for * |
0b2d0724e fs: simplify iget... |
1134 1135 |
* Search for the inode @ino in the inode cache, and if the inode is in the * cache, the inode is returned with an incremented reference count. |
1da177e4c Linux-2.6.12-rc2 |
1136 1137 1138 1139 |
*/ struct inode *ilookup(struct super_block *sb, unsigned long ino) { struct hlist_head *head = inode_hashtable + hash(sb, ino); |
1da177e4c Linux-2.6.12-rc2 |
1140 |
struct inode *inode; |
0b2d0724e fs: simplify iget... |
1141 1142 1143 |
spin_lock(&inode_hash_lock); inode = find_inode_fast(sb, head, ino); spin_unlock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
1144 |
|
1da177e4c Linux-2.6.12-rc2 |
1145 |
if (inode) |
0b2d0724e fs: simplify iget... |
1146 1147 |
wait_on_inode(inode); return inode; |
1da177e4c Linux-2.6.12-rc2 |
1148 |
} |
0b2d0724e fs: simplify iget... |
1149 |
EXPORT_SYMBOL(ilookup); |
1da177e4c Linux-2.6.12-rc2 |
1150 |
|
261bca86e nfsd/create race ... |
1151 1152 1153 1154 1155 |
int insert_inode_locked(struct inode *inode) { struct super_block *sb = inode->i_sb; ino_t ino = inode->i_ino; struct hlist_head *head = inode_hashtable + hash(sb, ino); |
261bca86e nfsd/create race ... |
1156 |
|
261bca86e nfsd/create race ... |
1157 |
while (1) { |
72a43d63c ext3/4 with synch... |
1158 1159 |
struct hlist_node *node; struct inode *old = NULL; |
67a23c494 fs: rename inode_... |
1160 |
spin_lock(&inode_hash_lock); |
72a43d63c ext3/4 with synch... |
1161 1162 1163 1164 1165 |
hlist_for_each_entry(old, node, head, i_hash) { if (old->i_ino != ino) continue; if (old->i_sb != sb) continue; |
250df6ed2 fs: protect inode... |
1166 1167 1168 |
spin_lock(&old->i_lock); if (old->i_state & (I_FREEING|I_WILL_FREE)) { spin_unlock(&old->i_lock); |
72a43d63c ext3/4 with synch... |
1169 |
continue; |
250df6ed2 fs: protect inode... |
1170 |
} |
72a43d63c ext3/4 with synch... |
1171 1172 1173 |
break; } if (likely(!node)) { |
250df6ed2 fs: protect inode... |
1174 1175 |
spin_lock(&inode->i_lock); inode->i_state |= I_NEW; |
261bca86e nfsd/create race ... |
1176 |
hlist_add_head(&inode->i_hash, head); |
250df6ed2 fs: protect inode... |
1177 |
spin_unlock(&inode->i_lock); |
67a23c494 fs: rename inode_... |
1178 |
spin_unlock(&inode_hash_lock); |
261bca86e nfsd/create race ... |
1179 1180 1181 |
return 0; } __iget(old); |
250df6ed2 fs: protect inode... |
1182 |
spin_unlock(&old->i_lock); |
67a23c494 fs: rename inode_... |
1183 |
spin_unlock(&inode_hash_lock); |
261bca86e nfsd/create race ... |
1184 |
wait_on_inode(old); |
1d3382cbf new helper: inode... |
1185 |
if (unlikely(!inode_unhashed(old))) { |
261bca86e nfsd/create race ... |
1186 1187 1188 1189 1190 1191 |
iput(old); return -EBUSY; } iput(old); } } |
261bca86e nfsd/create race ... |
1192 1193 1194 1195 1196 1197 1198 |
EXPORT_SYMBOL(insert_inode_locked); int insert_inode_locked4(struct inode *inode, unsigned long hashval, int (*test)(struct inode *, void *), void *data) { struct super_block *sb = inode->i_sb; struct hlist_head *head = inode_hashtable + hash(sb, hashval); |
261bca86e nfsd/create race ... |
1199 |
|
261bca86e nfsd/create race ... |
1200 |
while (1) { |
72a43d63c ext3/4 with synch... |
1201 1202 |
struct hlist_node *node; struct inode *old = NULL; |
67a23c494 fs: rename inode_... |
1203 |
spin_lock(&inode_hash_lock); |
72a43d63c ext3/4 with synch... |
1204 1205 1206 1207 1208 |
hlist_for_each_entry(old, node, head, i_hash) { if (old->i_sb != sb) continue; if (!test(old, data)) continue; |
250df6ed2 fs: protect inode... |
1209 1210 1211 |
spin_lock(&old->i_lock); if (old->i_state & (I_FREEING|I_WILL_FREE)) { spin_unlock(&old->i_lock); |
72a43d63c ext3/4 with synch... |
1212 |
continue; |
250df6ed2 fs: protect inode... |
1213 |
} |
72a43d63c ext3/4 with synch... |
1214 1215 1216 |
break; } if (likely(!node)) { |
250df6ed2 fs: protect inode... |
1217 1218 |
spin_lock(&inode->i_lock); inode->i_state |= I_NEW; |
261bca86e nfsd/create race ... |
1219 |
hlist_add_head(&inode->i_hash, head); |
250df6ed2 fs: protect inode... |
1220 |
spin_unlock(&inode->i_lock); |
67a23c494 fs: rename inode_... |
1221 |
spin_unlock(&inode_hash_lock); |
261bca86e nfsd/create race ... |
1222 1223 1224 |
return 0; } __iget(old); |
250df6ed2 fs: protect inode... |
1225 |
spin_unlock(&old->i_lock); |
67a23c494 fs: rename inode_... |
1226 |
spin_unlock(&inode_hash_lock); |
261bca86e nfsd/create race ... |
1227 |
wait_on_inode(old); |
1d3382cbf new helper: inode... |
1228 |
if (unlikely(!inode_unhashed(old))) { |
261bca86e nfsd/create race ... |
1229 1230 1231 1232 1233 1234 |
iput(old); return -EBUSY; } iput(old); } } |
261bca86e nfsd/create race ... |
1235 |
EXPORT_SYMBOL(insert_inode_locked4); |
1da177e4c Linux-2.6.12-rc2 |
1236 |
|
45321ac54 Make ->drop_inode... |
1237 1238 1239 1240 1241 |
int generic_delete_inode(struct inode *inode) { return 1; } EXPORT_SYMBOL(generic_delete_inode); |
1da177e4c Linux-2.6.12-rc2 |
1242 |
/* |
45321ac54 Make ->drop_inode... |
1243 1244 1245 |
* Normal UNIX filesystem behaviour: delete the * inode when the usage count drops to zero, and * i_nlink is zero. |
1da177e4c Linux-2.6.12-rc2 |
1246 |
*/ |
45321ac54 Make ->drop_inode... |
1247 |
int generic_drop_inode(struct inode *inode) |
1da177e4c Linux-2.6.12-rc2 |
1248 |
{ |
1d3382cbf new helper: inode... |
1249 |
return !inode->i_nlink || inode_unhashed(inode); |
1da177e4c Linux-2.6.12-rc2 |
1250 |
} |
45321ac54 Make ->drop_inode... |
1251 |
EXPORT_SYMBOL_GPL(generic_drop_inode); |
1da177e4c Linux-2.6.12-rc2 |
1252 |
|
45321ac54 Make ->drop_inode... |
1253 1254 1255 |
/* * Called when we're dropping the last reference * to an inode. |
22fe40421 vfs: split generi... |
1256 |
* |
45321ac54 Make ->drop_inode... |
1257 1258 1259 1260 1261 |
* Call the FS "drop_inode()" function, defaulting to * the legacy UNIX filesystem behaviour. If it tells * us to evict inode, do so. Otherwise, retain inode * in cache if fs is alive, sync and evict if fs is * shutting down. |
22fe40421 vfs: split generi... |
1262 |
*/ |
45321ac54 Make ->drop_inode... |
1263 |
static void iput_final(struct inode *inode) |
1da177e4c Linux-2.6.12-rc2 |
1264 1265 |
{ struct super_block *sb = inode->i_sb; |
45321ac54 Make ->drop_inode... |
1266 1267 |
const struct super_operations *op = inode->i_sb->s_op; int drop; |
250df6ed2 fs: protect inode... |
1268 |
WARN_ON(inode->i_state & I_NEW); |
e7f590970 kill useless chec... |
1269 |
if (op->drop_inode) |
45321ac54 Make ->drop_inode... |
1270 1271 1272 |
drop = op->drop_inode(inode); else drop = generic_drop_inode(inode); |
1da177e4c Linux-2.6.12-rc2 |
1273 |
|
b2b2af8e6 fs: factor inode ... |
1274 1275 1276 1277 1278 |
if (!drop && (sb->s_flags & MS_ACTIVE)) { inode->i_state |= I_REFERENCED; if (!(inode->i_state & (I_DIRTY|I_SYNC))) inode_lru_list_add(inode); spin_unlock(&inode->i_lock); |
b2b2af8e6 fs: factor inode ... |
1279 1280 |
return; } |
45321ac54 Make ->drop_inode... |
1281 |
if (!drop) { |
991114c6f [PATCH] fix for p... |
1282 |
inode->i_state |= I_WILL_FREE; |
250df6ed2 fs: protect inode... |
1283 |
spin_unlock(&inode->i_lock); |
1da177e4c Linux-2.6.12-rc2 |
1284 |
write_inode_now(inode, 1); |
250df6ed2 fs: protect inode... |
1285 |
spin_lock(&inode->i_lock); |
7ef0d7377 fs: new inode i_s... |
1286 |
WARN_ON(inode->i_state & I_NEW); |
991114c6f [PATCH] fix for p... |
1287 |
inode->i_state &= ~I_WILL_FREE; |
1da177e4c Linux-2.6.12-rc2 |
1288 |
} |
7ccf19a80 fs: inode split I... |
1289 |
|
991114c6f [PATCH] fix for p... |
1290 |
inode->i_state |= I_FREEING; |
c4ae0c654 vfs: avoid call t... |
1291 1292 |
if (!list_empty(&inode->i_lru)) inode_lru_list_del(inode); |
b2b2af8e6 fs: factor inode ... |
1293 |
spin_unlock(&inode->i_lock); |
b2b2af8e6 fs: factor inode ... |
1294 |
|
644da5960 fs/inode.c:evict(... |
1295 |
evict(inode); |
1da177e4c Linux-2.6.12-rc2 |
1296 |
} |
1da177e4c Linux-2.6.12-rc2 |
1297 |
/** |
6b3304b53 Make checkpatch.p... |
1298 |
* iput - put an inode |
1da177e4c Linux-2.6.12-rc2 |
1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 |
* @inode: inode to put * * Puts an inode, dropping its usage count. If the inode use count hits * zero, the inode is then freed and may also be destroyed. * * Consequently, iput() can sleep. */ void iput(struct inode *inode) { if (inode) { |
a4ffdde6e simplify checks f... |
1309 |
BUG_ON(inode->i_state & I_CLEAR); |
1da177e4c Linux-2.6.12-rc2 |
1310 |
|
f283c86af fs: remove inode_... |
1311 |
if (atomic_dec_and_lock(&inode->i_count, &inode->i_lock)) |
1da177e4c Linux-2.6.12-rc2 |
1312 1313 1314 |
iput_final(inode); } } |
1da177e4c Linux-2.6.12-rc2 |
1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 |
EXPORT_SYMBOL(iput); /** * bmap - find a block number in a file * @inode: inode of file * @block: block to find * * Returns the block number on the device holding the inode that * is the disk block number for the block of the file requested. * That is, asked for block 4 of inode 1 the function will return the |
6b3304b53 Make checkpatch.p... |
1325 |
* disk block relative to the disk start that holds that block of the |
1da177e4c Linux-2.6.12-rc2 |
1326 1327 |
* file. */ |
6b3304b53 Make checkpatch.p... |
1328 |
sector_t bmap(struct inode *inode, sector_t block) |
1da177e4c Linux-2.6.12-rc2 |
1329 1330 1331 1332 1333 1334 |
{ sector_t res = 0; if (inode->i_mapping->a_ops->bmap) res = inode->i_mapping->a_ops->bmap(inode->i_mapping, block); return res; } |
1da177e4c Linux-2.6.12-rc2 |
1335 |
EXPORT_SYMBOL(bmap); |
11ff6f05f Allow relatime to... |
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 1366 1367 1368 |
/* * With relative atime, only update atime if the previous atime is * earlier than either the ctime or mtime or if at least a day has * passed since the last atime update. */ static int relatime_need_update(struct vfsmount *mnt, struct inode *inode, struct timespec now) { if (!(mnt->mnt_flags & MNT_RELATIME)) return 1; /* * Is mtime younger than atime? If yes, update atime: */ if (timespec_compare(&inode->i_mtime, &inode->i_atime) >= 0) return 1; /* * Is ctime younger than atime? If yes, update atime: */ if (timespec_compare(&inode->i_ctime, &inode->i_atime) >= 0) return 1; /* * Is the previous atime value older than a day? If yes, * update atime: */ if ((long)(now.tv_sec - inode->i_atime.tv_sec) >= 24*60*60) return 1; /* * Good, we can skip the atime update: */ return 0; } |
1da177e4c Linux-2.6.12-rc2 |
1369 |
/** |
869243a0f [PATCH] remove up... |
1370 1371 |
* touch_atime - update the access time * @mnt: mount the inode is accessed on |
7045f37b1 [PATCH] DocBook: ... |
1372 |
* @dentry: dentry accessed |
1da177e4c Linux-2.6.12-rc2 |
1373 1374 1375 1376 1377 |
* * Update the accessed time on an inode and mark it for writeback. * This function automatically handles read only file systems and media, * as well as the "noatime" flag and inode specific "noatime" markers. */ |
869243a0f [PATCH] remove up... |
1378 |
void touch_atime(struct vfsmount *mnt, struct dentry *dentry) |
1da177e4c Linux-2.6.12-rc2 |
1379 |
{ |
869243a0f [PATCH] remove up... |
1380 |
struct inode *inode = dentry->d_inode; |
1da177e4c Linux-2.6.12-rc2 |
1381 |
struct timespec now; |
cdb70f3f7 [PATCH] r/o bind ... |
1382 |
if (inode->i_flags & S_NOATIME) |
b12536c27 vfs: optimization... |
1383 |
return; |
37756ced1 [PATCH] avoid one... |
1384 |
if (IS_NOATIME(inode)) |
b12536c27 vfs: optimization... |
1385 |
return; |
b22761384 [PATCH] touch_ati... |
1386 |
if ((inode->i_sb->s_flags & MS_NODIRATIME) && S_ISDIR(inode->i_mode)) |
b12536c27 vfs: optimization... |
1387 |
return; |
47ae32d6a [PATCH] relative ... |
1388 |
|
cdb70f3f7 [PATCH] r/o bind ... |
1389 |
if (mnt->mnt_flags & MNT_NOATIME) |
b12536c27 vfs: optimization... |
1390 |
return; |
cdb70f3f7 [PATCH] r/o bind ... |
1391 |
if ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)) |
b12536c27 vfs: optimization... |
1392 |
return; |
1da177e4c Linux-2.6.12-rc2 |
1393 1394 |
now = current_fs_time(inode->i_sb); |
11ff6f05f Allow relatime to... |
1395 1396 |
if (!relatime_need_update(mnt, inode, now)) |
b12536c27 vfs: optimization... |
1397 |
return; |
11ff6f05f Allow relatime to... |
1398 |
|
47ae32d6a [PATCH] relative ... |
1399 |
if (timespec_equal(&inode->i_atime, &now)) |
b12536c27 vfs: optimization... |
1400 1401 1402 1403 |
return; if (mnt_want_write(mnt)) return; |
47ae32d6a [PATCH] relative ... |
1404 1405 1406 |
inode->i_atime = now; mark_inode_dirty_sync(inode); |
cdb70f3f7 [PATCH] r/o bind ... |
1407 |
mnt_drop_write(mnt); |
1da177e4c Linux-2.6.12-rc2 |
1408 |
} |
869243a0f [PATCH] remove up... |
1409 |
EXPORT_SYMBOL(touch_atime); |
1da177e4c Linux-2.6.12-rc2 |
1410 1411 |
/** |
870f48179 [PATCH] replace i... |
1412 1413 |
* file_update_time - update mtime and ctime time * @file: file accessed |
1da177e4c Linux-2.6.12-rc2 |
1414 |
* |
870f48179 [PATCH] replace i... |
1415 1416 1417 1418 |
* Update the mtime and ctime members of an inode and mark the inode * for writeback. Note that this function is meant exclusively for * usage in the file write path of filesystems, and filesystems may * choose to explicitly ignore update via this function with the |
2eadfc0ed trivial: fs/inode... |
1419 |
* S_NOCMTIME inode flag, e.g. for network filesystem where these |
870f48179 [PATCH] replace i... |
1420 |
* timestamps are handled by the server. |
1da177e4c Linux-2.6.12-rc2 |
1421 |
*/ |
870f48179 [PATCH] replace i... |
1422 |
void file_update_time(struct file *file) |
1da177e4c Linux-2.6.12-rc2 |
1423 |
{ |
0f7fc9e4d [PATCH] VFS: chan... |
1424 |
struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4c Linux-2.6.12-rc2 |
1425 |
struct timespec now; |
ce06e0b21 vfs: optimize tou... |
1426 |
enum { S_MTIME = 1, S_CTIME = 2, S_VERSION = 4 } sync_it = 0; |
1da177e4c Linux-2.6.12-rc2 |
1427 |
|
ce06e0b21 vfs: optimize tou... |
1428 |
/* First try to exhaust all avenues to not sync */ |
1da177e4c Linux-2.6.12-rc2 |
1429 1430 |
if (IS_NOCMTIME(inode)) return; |
20ddee2c7 [PATCH] r/o bind ... |
1431 |
|
1da177e4c Linux-2.6.12-rc2 |
1432 |
now = current_fs_time(inode->i_sb); |
ce06e0b21 vfs: optimize tou... |
1433 1434 |
if (!timespec_equal(&inode->i_mtime, &now)) sync_it = S_MTIME; |
1da177e4c Linux-2.6.12-rc2 |
1435 |
|
ce06e0b21 vfs: optimize tou... |
1436 1437 |
if (!timespec_equal(&inode->i_ctime, &now)) sync_it |= S_CTIME; |
870f48179 [PATCH] replace i... |
1438 |
|
ce06e0b21 vfs: optimize tou... |
1439 1440 |
if (IS_I_VERSION(inode)) sync_it |= S_VERSION; |
7a224228e vfs: Add 64 bit i... |
1441 |
|
ce06e0b21 vfs: optimize tou... |
1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 |
if (!sync_it) return; /* Finally allowed to write? Takes lock. */ if (mnt_want_write_file(file)) return; /* Only change inode inside the lock region */ if (sync_it & S_VERSION) inode_inc_iversion(inode); if (sync_it & S_CTIME) inode->i_ctime = now; if (sync_it & S_MTIME) inode->i_mtime = now; mark_inode_dirty_sync(inode); |
20ddee2c7 [PATCH] r/o bind ... |
1457 |
mnt_drop_write(file->f_path.mnt); |
1da177e4c Linux-2.6.12-rc2 |
1458 |
} |
870f48179 [PATCH] replace i... |
1459 |
EXPORT_SYMBOL(file_update_time); |
1da177e4c Linux-2.6.12-rc2 |
1460 1461 1462 1463 1464 1465 1466 1467 1468 |
int inode_needs_sync(struct inode *inode) { if (IS_SYNC(inode)) return 1; if (S_ISDIR(inode->i_mode) && IS_DIRSYNC(inode)) return 1; return 0; } |
1da177e4c Linux-2.6.12-rc2 |
1469 |
EXPORT_SYMBOL(inode_needs_sync); |
1da177e4c Linux-2.6.12-rc2 |
1470 1471 1472 1473 1474 |
int inode_wait(void *word) { schedule(); return 0; } |
d44dab8d1 fs: xfs needs ino... |
1475 |
EXPORT_SYMBOL(inode_wait); |
1da177e4c Linux-2.6.12-rc2 |
1476 1477 |
/* |
168a9fd6a [PATCH] __wait_on... |
1478 1479 1480 1481 1482 1483 |
* If we try to find an inode in the inode hash while it is being * deleted, we have to wait until the filesystem completes its * deletion before reporting that it isn't found. This function waits * until the deletion _might_ have completed. Callers are responsible * to recheck inode state. * |
eaff8079d kill I_LOCK |
1484 |
* It doesn't matter if I_NEW is not set initially, a call to |
250df6ed2 fs: protect inode... |
1485 1486 |
* wake_up_bit(&inode->i_state, __I_NEW) after removing from the hash list * will DTRT. |
1da177e4c Linux-2.6.12-rc2 |
1487 1488 1489 1490 |
*/ static void __wait_on_freeing_inode(struct inode *inode) { wait_queue_head_t *wq; |
eaff8079d kill I_LOCK |
1491 1492 |
DEFINE_WAIT_BIT(wait, &inode->i_state, __I_NEW); wq = bit_waitqueue(&inode->i_state, __I_NEW); |
1da177e4c Linux-2.6.12-rc2 |
1493 |
prepare_to_wait(wq, &wait.wait, TASK_UNINTERRUPTIBLE); |
250df6ed2 fs: protect inode... |
1494 |
spin_unlock(&inode->i_lock); |
67a23c494 fs: rename inode_... |
1495 |
spin_unlock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
1496 1497 |
schedule(); finish_wait(wq, &wait.wait); |
67a23c494 fs: rename inode_... |
1498 |
spin_lock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
1499 |
} |
1da177e4c Linux-2.6.12-rc2 |
1500 1501 1502 1503 1504 1505 1506 1507 1508 1509 1510 1511 1512 1513 1514 1515 1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 |
static __initdata unsigned long ihash_entries; static int __init set_ihash_entries(char *str) { if (!str) return 0; ihash_entries = simple_strtoul(str, &str, 0); return 1; } __setup("ihash_entries=", set_ihash_entries); /* * Initialize the waitqueues and inode hash table. */ void __init inode_init_early(void) { int loop; /* If hashes are distributed across NUMA nodes, defer * hash allocation until vmalloc space is available. */ if (hashdist) return; inode_hashtable = alloc_large_system_hash("Inode-cache", sizeof(struct hlist_head), ihash_entries, 14, HASH_EARLY, &i_hash_shift, &i_hash_mask, 0); for (loop = 0; loop < (1 << i_hash_shift); loop++) INIT_HLIST_HEAD(&inode_hashtable[loop]); } |
74bf17cff fs: remove the un... |
1536 |
void __init inode_init(void) |
1da177e4c Linux-2.6.12-rc2 |
1537 1538 1539 1540 |
{ int loop; /* inode slab cache */ |
b0196009d [PATCH] cpuset me... |
1541 1542 1543 1544 1545 |
inode_cachep = kmem_cache_create("inode_cache", sizeof(struct inode), 0, (SLAB_RECLAIM_ACCOUNT|SLAB_PANIC| SLAB_MEM_SPREAD), |
20c2df83d mm: Remove slab d... |
1546 |
init_once); |
1da177e4c Linux-2.6.12-rc2 |
1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 1567 1568 1569 1570 1571 1572 1573 1574 1575 1576 1577 1578 1579 |
/* Hash may have been set up in inode_init_early */ if (!hashdist) return; inode_hashtable = alloc_large_system_hash("Inode-cache", sizeof(struct hlist_head), ihash_entries, 14, 0, &i_hash_shift, &i_hash_mask, 0); for (loop = 0; loop < (1 << i_hash_shift); loop++) INIT_HLIST_HEAD(&inode_hashtable[loop]); } void init_special_inode(struct inode *inode, umode_t mode, dev_t rdev) { inode->i_mode = mode; if (S_ISCHR(mode)) { inode->i_fop = &def_chr_fops; inode->i_rdev = rdev; } else if (S_ISBLK(mode)) { inode->i_fop = &def_blk_fops; inode->i_rdev = rdev; } else if (S_ISFIFO(mode)) inode->i_fop = &def_fifo_fops; else if (S_ISSOCK(mode)) inode->i_fop = &bad_sock_fops; else |
af0d9ae81 fs/inode.c: add d... |
1580 1581 1582 1583 |
printk(KERN_DEBUG "init_special_inode: bogus i_mode (%o) for" " inode %s:%lu ", mode, inode->i_sb->s_id, inode->i_ino); |
1da177e4c Linux-2.6.12-rc2 |
1584 1585 |
} EXPORT_SYMBOL(init_special_inode); |
a1bd120d1 vfs: Add inode ui... |
1586 1587 |
/** |
eaae668d0 fs/inode: Fix ker... |
1588 |
* inode_init_owner - Init uid,gid,mode for new inode according to posix standards |
a1bd120d1 vfs: Add inode ui... |
1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 |
* @inode: New inode * @dir: Directory inode * @mode: mode of the new inode */ void inode_init_owner(struct inode *inode, const struct inode *dir, mode_t mode) { inode->i_uid = current_fsuid(); if (dir && dir->i_mode & S_ISGID) { inode->i_gid = dir->i_gid; if (S_ISDIR(mode)) mode |= S_ISGID; } else inode->i_gid = current_fsgid(); inode->i_mode = mode; } EXPORT_SYMBOL(inode_init_owner); |
e795b7179 userns: userns: c... |
1606 |
|
2e1496707 userns: rename is... |
1607 1608 1609 1610 1611 1612 |
/** * inode_owner_or_capable - check current task permissions to inode * @inode: inode being checked * * Return true if current either has CAP_FOWNER to the inode, or * owns the file. |
e795b7179 userns: userns: c... |
1613 |
*/ |
2e1496707 userns: rename is... |
1614 |
bool inode_owner_or_capable(const struct inode *inode) |
e795b7179 userns: userns: c... |
1615 1616 1617 1618 1619 1620 1621 1622 1623 |
{ struct user_namespace *ns = inode_userns(inode); if (current_user_ns() == ns && current_fsuid() == inode->i_uid) return true; if (ns_capable(ns, CAP_FOWNER)) return true; return false; } |
2e1496707 userns: rename is... |
1624 |
EXPORT_SYMBOL(inode_owner_or_capable); |