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fs/inode.c
50 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/export.h> |
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#include <linux/fs.h> #include <linux/mm.h> |
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#include <linux/backing-dev.h> |
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#include <linux/hash.h> #include <linux/swap.h> #include <linux/security.h> |
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#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/posix_acl.h> |
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#include <linux/prefetch.h> |
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#include <linux/buffer_head.h> /* for inode_has_buffers */ |
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#include <linux/ratelimit.h> |
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#include <linux/list_lru.h> |
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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 LRU list locks protect: |
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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 LRU list locks |
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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 long, nr_inodes); static DEFINE_PER_CPU(unsigned long, 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 long get_nr_inodes(void) |
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{ |
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int i; |
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long sum = 0; |
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for_each_possible_cpu(i) sum += per_cpu(nr_inodes, i); return sum < 0 ? 0 : sum; |
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} |
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static inline long get_nr_inodes_unused(void) |
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{ |
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int i; |
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long sum = 0; |
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for_each_possible_cpu(i) sum += per_cpu(nr_unused, i); return sum < 0 ? 0 : sum; |
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} |
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long get_nr_dirty_inodes(void) |
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{ |
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/* not actually dirty inodes, but a wild approximation */ |
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long nr_dirty = get_nr_inodes() - get_nr_inodes_unused(); |
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return nr_dirty > 0 ? nr_dirty : 0; |
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} /* * Handle nr_inode sysctl */ #ifdef CONFIG_SYSCTL |
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int proc_nr_inodes(struct ctl_table *table, int write, |
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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_doulongvec_minmax(table, write, buffer, lenp, ppos); |
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} #endif |
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static int no_open(struct inode *inode, struct file *file) { return -ENXIO; } |
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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 no_open_fops = {.open = no_open}; |
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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; |
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inode->i_fop = &no_open_fops; |
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inode->__i_nlink = 1; |
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inode->i_opflags = 0; |
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i_uid_write(inode, 0); i_gid_write(inode, 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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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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atomic_set(&mapping->i_mmap_writable, 0); |
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mapping_set_gfp_mask(mapping, GFP_HIGHUSER_MOVABLE); |
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mapping->private_data = NULL; |
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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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INIT_HLIST_HEAD(&inode->i_dentry); /* buggered by rcu freeing */ |
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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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if (!inode->i_nlink) { WARN_ON(atomic_long_read(&inode->i_sb->s_remove_count) == 0); atomic_long_dec(&inode->i_sb->s_remove_count); } |
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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); |
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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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/** * drop_nlink - directly drop an inode's link count * @inode: inode * * This is a low-level filesystem helper to replace any * direct filesystem manipulation of i_nlink. In cases * where we are attempting to track writes to the * filesystem, a decrement to zero means an imminent * write when the file is truncated and actually unlinked * on the filesystem. */ void drop_nlink(struct inode *inode) { WARN_ON(inode->i_nlink == 0); inode->__i_nlink--; if (!inode->i_nlink) atomic_long_inc(&inode->i_sb->s_remove_count); } EXPORT_SYMBOL(drop_nlink); /** * clear_nlink - directly zero an inode's link count * @inode: inode * * This is a low-level filesystem helper to replace any * direct filesystem manipulation of i_nlink. See * drop_nlink() for why we care about i_nlink hitting zero. */ void clear_nlink(struct inode *inode) { if (inode->i_nlink) { inode->__i_nlink = 0; atomic_long_inc(&inode->i_sb->s_remove_count); } } EXPORT_SYMBOL(clear_nlink); /** * set_nlink - directly set an inode's link count * @inode: inode * @nlink: new nlink (should be non-zero) * * This is a low-level filesystem helper to replace any * direct filesystem manipulation of i_nlink. */ void set_nlink(struct inode *inode, unsigned int nlink) { if (!nlink) { |
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clear_nlink(inode); } else { /* Yes, some filesystems do change nlink from zero to one */ if (inode->i_nlink == 0) atomic_long_dec(&inode->i_sb->s_remove_count); inode->__i_nlink = nlink; } } EXPORT_SYMBOL(set_nlink); /** * inc_nlink - directly increment an inode's link count * @inode: inode * * This is a low-level filesystem helper to replace any * direct filesystem manipulation of i_nlink. Currently, * it is only here for parity with dec_nlink(). */ void inc_nlink(struct inode *inode) { |
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if (unlikely(inode->i_nlink == 0)) { WARN_ON(!(inode->i_state & I_LINKABLE)); |
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atomic_long_dec(&inode->i_sb->s_remove_count); |
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} |
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inode->__i_nlink++; } EXPORT_SYMBOL(inc_nlink); |
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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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init_rwsem(&mapping->i_mmap_rwsem); |
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INIT_LIST_HEAD(&mapping->private_list); spin_lock_init(&mapping->private_lock); |
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mapping->i_mmap = RB_ROOT; |
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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); |
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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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if (list_lru_add(&inode->i_sb->s_inode_lru, &inode->i_lru)) |
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this_cpu_inc(nr_unused); |
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} |
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|
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/* * Add inode to LRU if needed (inode is unused and clean). * * Needs inode->i_lock held. */ void inode_add_lru(struct inode *inode) { if (!(inode->i_state & (I_DIRTY | I_SYNC | I_FREEING | I_WILL_FREE)) && !atomic_read(&inode->i_count) && inode->i_sb->s_flags & MS_ACTIVE) inode_lru_list_add(inode); } |
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static void inode_lru_list_del(struct inode *inode) { |
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if (list_lru_del(&inode->i_sb->s_inode_lru, &inode->i_lru)) |
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this_cpu_dec(nr_unused); |
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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; |
4b4563dc8 fs: cosmetic inod... |
435 436 |
tmp = tmp ^ ((tmp ^ GOLDEN_RATIO_PRIME) >> i_hash_shift); return tmp & i_hash_mask; |
4c51acbc6 fs: Factor inode ... |
437 438 439 440 441 442 443 444 445 446 447 448 |
} /** * __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) { |
646ec4615 fs: remove inode_... |
449 |
struct hlist_head *b = inode_hashtable + hash(inode->i_sb, hashval); |
67a23c494 fs: rename inode_... |
450 |
spin_lock(&inode_hash_lock); |
250df6ed2 fs: protect inode... |
451 |
spin_lock(&inode->i_lock); |
646ec4615 fs: remove inode_... |
452 |
hlist_add_head(&inode->i_hash, b); |
250df6ed2 fs: protect inode... |
453 |
spin_unlock(&inode->i_lock); |
67a23c494 fs: rename inode_... |
454 |
spin_unlock(&inode_hash_lock); |
4c51acbc6 fs: Factor inode ... |
455 456 457 458 |
} EXPORT_SYMBOL(__insert_inode_hash); /** |
f2ee7abf4 vfs: avoid taking... |
459 |
* __remove_inode_hash - remove an inode from the hash |
4c51acbc6 fs: Factor inode ... |
460 461 462 463 |
* @inode: inode to unhash * * Remove an inode from the superblock. */ |
f2ee7abf4 vfs: avoid taking... |
464 |
void __remove_inode_hash(struct inode *inode) |
4c51acbc6 fs: Factor inode ... |
465 |
{ |
67a23c494 fs: rename inode_... |
466 |
spin_lock(&inode_hash_lock); |
250df6ed2 fs: protect inode... |
467 |
spin_lock(&inode->i_lock); |
4c51acbc6 fs: Factor inode ... |
468 |
hlist_del_init(&inode->i_hash); |
250df6ed2 fs: protect inode... |
469 |
spin_unlock(&inode->i_lock); |
67a23c494 fs: rename inode_... |
470 |
spin_unlock(&inode_hash_lock); |
4c51acbc6 fs: Factor inode ... |
471 |
} |
f2ee7abf4 vfs: avoid taking... |
472 |
EXPORT_SYMBOL(__remove_inode_hash); |
4c51acbc6 fs: Factor inode ... |
473 |
|
dbd5768f8 vfs: Rename end_w... |
474 |
void clear_inode(struct inode *inode) |
b0683aa63 new helper: end_w... |
475 476 |
{ might_sleep(); |
08142579b mm: fix assertion... |
477 478 479 480 481 482 |
/* * 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); |
b0683aa63 new helper: end_w... |
483 |
BUG_ON(inode->i_data.nrpages); |
91b0abe36 mm + fs: store sh... |
484 |
BUG_ON(inode->i_data.nrshadows); |
08142579b mm: fix assertion... |
485 |
spin_unlock_irq(&inode->i_data.tree_lock); |
b0683aa63 new helper: end_w... |
486 487 488 |
BUG_ON(!list_empty(&inode->i_data.private_list)); BUG_ON(!(inode->i_state & I_FREEING)); BUG_ON(inode->i_state & I_CLEAR); |
fa0d7e3de fs: icache RCU fr... |
489 |
/* don't need i_lock here, no concurrent mods to i_state */ |
b0683aa63 new helper: end_w... |
490 491 |
inode->i_state = I_FREEING | I_CLEAR; } |
dbd5768f8 vfs: Rename end_w... |
492 |
EXPORT_SYMBOL(clear_inode); |
b0683aa63 new helper: end_w... |
493 |
|
b2b2af8e6 fs: factor inode ... |
494 495 496 497 498 499 500 501 502 503 504 505 506 |
/* * 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(... |
507 |
static void evict(struct inode *inode) |
b4272d4c8 unify fs/inode.c ... |
508 509 |
{ const struct super_operations *op = inode->i_sb->s_op; |
b2b2af8e6 fs: factor inode ... |
510 511 |
BUG_ON(!(inode->i_state & I_FREEING)); BUG_ON(!list_empty(&inode->i_lru)); |
b12362bdb vfs: conditionall... |
512 513 |
if (!list_empty(&inode->i_wb_list)) inode_wb_list_del(inode); |
55fa6091d fs: move i_sb_lis... |
514 |
inode_sb_list_del(inode); |
169ebd901 writeback: Avoid ... |
515 516 517 518 519 520 521 |
/* * Wait for flusher thread to be done with the inode so that filesystem * does not start destroying it while writeback is still running. Since * the inode has I_FREEING set, flusher thread won't start new work on * the inode. We just have to wait for running writeback to finish. */ inode_wait_for_writeback(inode); |
7994e6f72 vfs: Move waiting... |
522 |
|
be7ce4161 New method - evic... |
523 524 |
if (op->evict_inode) { op->evict_inode(inode); |
b4272d4c8 unify fs/inode.c ... |
525 |
} else { |
91b0abe36 mm + fs: store sh... |
526 |
truncate_inode_pages_final(&inode->i_data); |
dbd5768f8 vfs: Rename end_w... |
527 |
clear_inode(inode); |
b4272d4c8 unify fs/inode.c ... |
528 |
} |
661074e91 Take ->i_bdev/->i... |
529 530 531 532 |
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 ... |
533 534 535 536 537 538 539 540 541 |
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 ... |
542 |
} |
1da177e4c Linux-2.6.12-rc2 |
543 544 545 546 547 548 549 550 551 |
/* * 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 |
552 553 |
while (!list_empty(head)) { struct inode *inode; |
7ccf19a80 fs: inode split I... |
554 555 |
inode = list_first_entry(head, struct inode, i_lru); list_del_init(&inode->i_lru); |
1da177e4c Linux-2.6.12-rc2 |
556 |
|
644da5960 fs/inode.c:evict(... |
557 |
evict(inode); |
1da177e4c Linux-2.6.12-rc2 |
558 |
} |
1da177e4c Linux-2.6.12-rc2 |
559 |
} |
a03187867 fs: fold invalida... |
560 |
/** |
63997e98a split invalidate_... |
561 562 563 564 565 566 567 |
* 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 |
568 |
*/ |
63997e98a split invalidate_... |
569 |
void evict_inodes(struct super_block *sb) |
1da177e4c Linux-2.6.12-rc2 |
570 |
{ |
63997e98a split invalidate_... |
571 572 |
struct inode *inode, *next; LIST_HEAD(dispose); |
1da177e4c Linux-2.6.12-rc2 |
573 |
|
55fa6091d fs: move i_sb_lis... |
574 |
spin_lock(&inode_sb_list_lock); |
63997e98a split invalidate_... |
575 576 |
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... |
577 |
continue; |
250df6ed2 fs: protect inode... |
578 579 580 581 |
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 |
582 |
continue; |
250df6ed2 fs: protect inode... |
583 |
} |
63997e98a split invalidate_... |
584 585 |
inode->i_state |= I_FREEING; |
02afc410f fs: Lock the inod... |
586 |
inode_lru_list_del(inode); |
250df6ed2 fs: protect inode... |
587 |
spin_unlock(&inode->i_lock); |
02afc410f fs: Lock the inod... |
588 |
list_add(&inode->i_lru, &dispose); |
1da177e4c Linux-2.6.12-rc2 |
589 |
} |
55fa6091d fs: move i_sb_lis... |
590 |
spin_unlock(&inode_sb_list_lock); |
63997e98a split invalidate_... |
591 592 |
dispose_list(&dispose); |
1da177e4c Linux-2.6.12-rc2 |
593 |
} |
1da177e4c Linux-2.6.12-rc2 |
594 |
/** |
a03187867 fs: fold invalida... |
595 596 |
* invalidate_inodes - attempt to free all inodes on a superblock * @sb: superblock to operate on |
93b270f76 Fix over-zealous ... |
597 |
* @kill_dirty: flag to guide handling of dirty inodes |
1da177e4c Linux-2.6.12-rc2 |
598 |
* |
a03187867 fs: fold invalida... |
599 600 |
* 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 ... |
601 602 |
* If @kill_dirty is set, discard dirty inodes too, otherwise treat * them as busy. |
1da177e4c Linux-2.6.12-rc2 |
603 |
*/ |
93b270f76 Fix over-zealous ... |
604 |
int invalidate_inodes(struct super_block *sb, bool kill_dirty) |
1da177e4c Linux-2.6.12-rc2 |
605 |
{ |
cffbc8aa3 fs: Convert nr_in... |
606 |
int busy = 0; |
a03187867 fs: fold invalida... |
607 608 |
struct inode *inode, *next; LIST_HEAD(dispose); |
1da177e4c Linux-2.6.12-rc2 |
609 |
|
55fa6091d fs: move i_sb_lis... |
610 |
spin_lock(&inode_sb_list_lock); |
a03187867 fs: fold invalida... |
611 |
list_for_each_entry_safe(inode, next, &sb->s_inodes, i_sb_list) { |
250df6ed2 fs: protect inode... |
612 613 614 |
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... |
615 |
continue; |
250df6ed2 fs: protect inode... |
616 |
} |
93b270f76 Fix over-zealous ... |
617 |
if (inode->i_state & I_DIRTY && !kill_dirty) { |
250df6ed2 fs: protect inode... |
618 |
spin_unlock(&inode->i_lock); |
93b270f76 Fix over-zealous ... |
619 620 621 |
busy = 1; continue; } |
99a389192 fs: fix buffer in... |
622 |
if (atomic_read(&inode->i_count)) { |
250df6ed2 fs: protect inode... |
623 |
spin_unlock(&inode->i_lock); |
99a389192 fs: fix buffer in... |
624 |
busy = 1; |
1da177e4c Linux-2.6.12-rc2 |
625 626 |
continue; } |
99a389192 fs: fix buffer in... |
627 |
|
99a389192 fs: fix buffer in... |
628 |
inode->i_state |= I_FREEING; |
02afc410f fs: Lock the inod... |
629 |
inode_lru_list_del(inode); |
250df6ed2 fs: protect inode... |
630 |
spin_unlock(&inode->i_lock); |
02afc410f fs: Lock the inod... |
631 |
list_add(&inode->i_lru, &dispose); |
1da177e4c Linux-2.6.12-rc2 |
632 |
} |
55fa6091d fs: move i_sb_lis... |
633 |
spin_unlock(&inode_sb_list_lock); |
1da177e4c Linux-2.6.12-rc2 |
634 |
|
a03187867 fs: fold invalida... |
635 |
dispose_list(&dispose); |
1da177e4c Linux-2.6.12-rc2 |
636 637 638 |
return busy; } |
1da177e4c Linux-2.6.12-rc2 |
639 |
|
1da177e4c Linux-2.6.12-rc2 |
640 |
/* |
bc3b14cb2 inode: convert in... |
641 |
* Isolate the inode from the LRU in preparation for freeing it. |
1da177e4c Linux-2.6.12-rc2 |
642 643 |
* * Any inodes which are pinned purely because of attached pagecache have their |
9e38d86ff fs: Implement laz... |
644 645 |
* pagecache removed. If the inode has metadata buffers attached to * mapping->private_list then try to remove them. |
1da177e4c Linux-2.6.12-rc2 |
646 |
* |
9e38d86ff fs: Implement laz... |
647 648 649 650 651 652 653 |
* 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 |
654 |
*/ |
bc3b14cb2 inode: convert in... |
655 656 |
static enum lru_status inode_lru_isolate(struct list_head *item, spinlock_t *lru_lock, void *arg) |
1da177e4c Linux-2.6.12-rc2 |
657 |
{ |
bc3b14cb2 inode: convert in... |
658 659 |
struct list_head *freeable = arg; struct inode *inode = container_of(item, struct inode, i_lru); |
1da177e4c Linux-2.6.12-rc2 |
660 |
|
bc3b14cb2 inode: convert in... |
661 662 663 664 665 666 |
/* * we are inverting the lru lock/inode->i_lock here, so use a trylock. * If we fail to get the lock, just skip it. */ if (!spin_trylock(&inode->i_lock)) return LRU_SKIP; |
1da177e4c Linux-2.6.12-rc2 |
667 |
|
bc3b14cb2 inode: convert in... |
668 669 670 671 672 673 674 675 676 677 678 |
/* * 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)) { list_del_init(&inode->i_lru); spin_unlock(&inode->i_lock); this_cpu_dec(nr_unused); return LRU_REMOVED; } |
1da177e4c Linux-2.6.12-rc2 |
679 |
|
bc3b14cb2 inode: convert in... |
680 681 682 683 684 685 |
/* recently referenced inodes get one more pass */ if (inode->i_state & I_REFERENCED) { inode->i_state &= ~I_REFERENCED; spin_unlock(&inode->i_lock); return LRU_ROTATE; } |
1da177e4c Linux-2.6.12-rc2 |
686 |
|
bc3b14cb2 inode: convert in... |
687 688 689 690 691 692 693 694 695 696 697 698 699 |
if (inode_has_buffers(inode) || inode->i_data.nrpages) { __iget(inode); spin_unlock(&inode->i_lock); spin_unlock(lru_lock); if (remove_inode_buffers(inode)) { unsigned long reap; reap = invalidate_mapping_pages(&inode->i_data, 0, -1); if (current_is_kswapd()) __count_vm_events(KSWAPD_INODESTEAL, reap); else __count_vm_events(PGINODESTEAL, reap); if (current->reclaim_state) current->reclaim_state->reclaimed_slab += reap; |
02afc410f fs: Lock the inod... |
700 |
} |
bc3b14cb2 inode: convert in... |
701 702 703 704 |
iput(inode); spin_lock(lru_lock); return LRU_RETRY; } |
02afc410f fs: Lock the inod... |
705 |
|
bc3b14cb2 inode: convert in... |
706 707 |
WARN_ON(inode->i_state & I_NEW); inode->i_state |= I_FREEING; |
d38fa6986 inode: move inode... |
708 |
list_move(&inode->i_lru, freeable); |
bc3b14cb2 inode: convert in... |
709 |
spin_unlock(&inode->i_lock); |
9e38d86ff fs: Implement laz... |
710 |
|
bc3b14cb2 inode: convert in... |
711 712 713 |
this_cpu_dec(nr_unused); return LRU_REMOVED; } |
7ccf19a80 fs: inode split I... |
714 |
|
bc3b14cb2 inode: convert in... |
715 716 717 718 719 720 |
/* * 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(). */ |
9b17c6238 fs: convert inode... |
721 722 |
long prune_icache_sb(struct super_block *sb, unsigned long nr_to_scan, int nid) |
bc3b14cb2 inode: convert in... |
723 724 725 |
{ LIST_HEAD(freeable); long freed; |
1da177e4c Linux-2.6.12-rc2 |
726 |
|
9b17c6238 fs: convert inode... |
727 728 |
freed = list_lru_walk_node(&sb->s_inode_lru, nid, inode_lru_isolate, &freeable, &nr_to_scan); |
1da177e4c Linux-2.6.12-rc2 |
729 |
dispose_list(&freeable); |
0a234c6dc shrinker: convert... |
730 |
return freed; |
1da177e4c Linux-2.6.12-rc2 |
731 |
} |
1da177e4c Linux-2.6.12-rc2 |
732 733 734 |
static void __wait_on_freeing_inode(struct inode *inode); /* * Called with the inode lock held. |
1da177e4c Linux-2.6.12-rc2 |
735 |
*/ |
6b3304b53 Make checkpatch.p... |
736 737 738 739 |
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 |
740 |
{ |
6b3304b53 Make checkpatch.p... |
741 |
struct inode *inode = NULL; |
1da177e4c Linux-2.6.12-rc2 |
742 743 |
repeat: |
b67bfe0d4 hlist: drop the n... |
744 |
hlist_for_each_entry(inode, head, i_hash) { |
5a3cd9928 iget/iget5: don't... |
745 |
if (inode->i_sb != sb) |
1da177e4c Linux-2.6.12-rc2 |
746 |
continue; |
5a3cd9928 iget/iget5: don't... |
747 |
if (!test(inode, data)) |
1da177e4c Linux-2.6.12-rc2 |
748 |
continue; |
5a3cd9928 iget/iget5: don't... |
749 |
spin_lock(&inode->i_lock); |
a4ffdde6e simplify checks f... |
750 |
if (inode->i_state & (I_FREEING|I_WILL_FREE)) { |
1da177e4c Linux-2.6.12-rc2 |
751 752 753 |
__wait_on_freeing_inode(inode); goto repeat; } |
f7899bd54 fs: move i_count ... |
754 |
__iget(inode); |
250df6ed2 fs: protect inode... |
755 |
spin_unlock(&inode->i_lock); |
f7899bd54 fs: move i_count ... |
756 |
return inode; |
1da177e4c Linux-2.6.12-rc2 |
757 |
} |
f7899bd54 fs: move i_count ... |
758 |
return NULL; |
1da177e4c Linux-2.6.12-rc2 |
759 760 761 762 763 764 |
} /* * find_inode_fast is the fast path version of find_inode, see the comment at * iget_locked for details. */ |
6b3304b53 Make checkpatch.p... |
765 766 |
static struct inode *find_inode_fast(struct super_block *sb, struct hlist_head *head, unsigned long ino) |
1da177e4c Linux-2.6.12-rc2 |
767 |
{ |
6b3304b53 Make checkpatch.p... |
768 |
struct inode *inode = NULL; |
1da177e4c Linux-2.6.12-rc2 |
769 770 |
repeat: |
b67bfe0d4 hlist: drop the n... |
771 |
hlist_for_each_entry(inode, head, i_hash) { |
5a3cd9928 iget/iget5: don't... |
772 |
if (inode->i_ino != ino) |
1da177e4c Linux-2.6.12-rc2 |
773 |
continue; |
5a3cd9928 iget/iget5: don't... |
774 |
if (inode->i_sb != sb) |
1da177e4c Linux-2.6.12-rc2 |
775 |
continue; |
5a3cd9928 iget/iget5: don't... |
776 |
spin_lock(&inode->i_lock); |
a4ffdde6e simplify checks f... |
777 |
if (inode->i_state & (I_FREEING|I_WILL_FREE)) { |
1da177e4c Linux-2.6.12-rc2 |
778 779 780 |
__wait_on_freeing_inode(inode); goto repeat; } |
f7899bd54 fs: move i_count ... |
781 |
__iget(inode); |
250df6ed2 fs: protect inode... |
782 |
spin_unlock(&inode->i_lock); |
f7899bd54 fs: move i_count ... |
783 |
return inode; |
1da177e4c Linux-2.6.12-rc2 |
784 |
} |
f7899bd54 fs: move i_count ... |
785 |
return NULL; |
8290c35f8 Inode: Allow exte... |
786 |
} |
f991bd2e1 fs: introduce a p... |
787 788 789 790 |
/* * 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... |
791 |
* |
f991bd2e1 fs: introduce a p... |
792 793 794 795 796 797 798 799 800 |
* 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... |
801 |
*/ |
f991bd2e1 fs: introduce a p... |
802 803 |
#define LAST_INO_BATCH 1024 static DEFINE_PER_CPU(unsigned int, last_ino); |
85fe4025c fs: do not assign... |
804 |
unsigned int get_next_ino(void) |
8290c35f8 Inode: Allow exte... |
805 |
{ |
f991bd2e1 fs: introduce a p... |
806 807 |
unsigned int *p = &get_cpu_var(last_ino); unsigned int res = *p; |
8290c35f8 Inode: Allow exte... |
808 |
|
f991bd2e1 fs: introduce a p... |
809 810 811 812 813 814 815 816 817 818 819 820 |
#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... |
821 |
} |
85fe4025c fs: do not assign... |
822 |
EXPORT_SYMBOL(get_next_ino); |
8290c35f8 Inode: Allow exte... |
823 |
|
1da177e4c Linux-2.6.12-rc2 |
824 |
/** |
a209dfc7b vfs: dont chain p... |
825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 |
* 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 |
848 849 850 |
* new_inode - obtain an inode * @sb: superblock * |
769848c03 Add __GFP_MOVABLE... |
851 |
* Allocates a new inode for given superblock. The default gfp_mask |
3c1d43787 mm: remove GFP_HI... |
852 |
* for allocations related to inode->i_mapping is GFP_HIGHUSER_MOVABLE. |
769848c03 Add __GFP_MOVABLE... |
853 854 855 856 857 |
* 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 |
858 859 860 |
*/ struct inode *new_inode(struct super_block *sb) { |
6b3304b53 Make checkpatch.p... |
861 |
struct inode *inode; |
1da177e4c Linux-2.6.12-rc2 |
862 |
|
55fa6091d fs: move i_sb_lis... |
863 |
spin_lock_prefetch(&inode_sb_list_lock); |
6b3304b53 Make checkpatch.p... |
864 |
|
a209dfc7b vfs: dont chain p... |
865 866 |
inode = new_inode_pseudo(sb); if (inode) |
55fa6091d fs: move i_sb_lis... |
867 |
inode_sb_list_add(inode); |
1da177e4c Linux-2.6.12-rc2 |
868 869 |
return inode; } |
1da177e4c Linux-2.6.12-rc2 |
870 |
EXPORT_SYMBOL(new_inode); |
14358e6dd lockdep: annotate... |
871 |
#ifdef CONFIG_DEBUG_LOCK_ALLOC |
e096d0c7e lockdep: Add help... |
872 873 |
void lockdep_annotate_inode_mutex_key(struct inode *inode) { |
a3314a0ed lockdep: fixup ch... |
874 |
if (S_ISDIR(inode->i_mode)) { |
1e89a5e15 lockdep: fixup th... |
875 |
struct file_system_type *type = inode->i_sb->s_type; |
9a7aa12f3 vfs: Set special ... |
876 |
/* Set new key only if filesystem hasn't already changed it */ |
978d6d8c4 vfs: Correctly se... |
877 |
if (lockdep_match_class(&inode->i_mutex, &type->i_mutex_key)) { |
9a7aa12f3 vfs: Set special ... |
878 879 880 881 882 883 884 885 |
/* * 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... |
886 |
} |
e096d0c7e lockdep: Add help... |
887 888 |
} EXPORT_SYMBOL(lockdep_annotate_inode_mutex_key); |
14358e6dd lockdep: annotate... |
889 |
#endif |
e096d0c7e lockdep: Add help... |
890 891 892 893 894 895 896 897 898 899 900 |
/** * 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... |
901 |
spin_lock(&inode->i_lock); |
eaff8079d kill I_LOCK |
902 903 |
WARN_ON(!(inode->i_state & I_NEW)); inode->i_state &= ~I_NEW; |
310fa7a36 restore smp_mb() ... |
904 |
smp_mb(); |
250df6ed2 fs: protect inode... |
905 906 |
wake_up_bit(&inode->i_state, __I_NEW); spin_unlock(&inode->i_lock); |
1da177e4c Linux-2.6.12-rc2 |
907 |
} |
1da177e4c Linux-2.6.12-rc2 |
908 |
EXPORT_SYMBOL(unlock_new_inode); |
0b2d0724e fs: simplify iget... |
909 |
/** |
375e289ea vfs: pull ext4's ... |
910 |
* lock_two_nondirectories - take two i_mutexes on non-directory objects |
4fd699ae3 vfs: lock_two_non... |
911 912 913 914 |
* * Lock any non-NULL argument that is not a directory. * Zero, one or two objects may be locked by this function. * |
375e289ea vfs: pull ext4's ... |
915 916 917 918 919 |
* @inode1: first inode to lock * @inode2: second inode to lock */ void lock_two_nondirectories(struct inode *inode1, struct inode *inode2) { |
4fd699ae3 vfs: lock_two_non... |
920 921 922 923 |
if (inode1 > inode2) swap(inode1, inode2); if (inode1 && !S_ISDIR(inode1->i_mode)) |
275555163 vfs: don't use PA... |
924 |
mutex_lock(&inode1->i_mutex); |
4fd699ae3 vfs: lock_two_non... |
925 |
if (inode2 && !S_ISDIR(inode2->i_mode) && inode2 != inode1) |
40bd22c9f vfs: rename I_MUT... |
926 |
mutex_lock_nested(&inode2->i_mutex, I_MUTEX_NONDIR2); |
375e289ea vfs: pull ext4's ... |
927 928 929 930 931 932 933 934 935 936 |
} EXPORT_SYMBOL(lock_two_nondirectories); /** * unlock_two_nondirectories - release locks from lock_two_nondirectories() * @inode1: first inode to unlock * @inode2: second inode to unlock */ void unlock_two_nondirectories(struct inode *inode1, struct inode *inode2) { |
4fd699ae3 vfs: lock_two_non... |
937 938 939 |
if (inode1 && !S_ISDIR(inode1->i_mode)) mutex_unlock(&inode1->i_mutex); if (inode2 && !S_ISDIR(inode2->i_mode) && inode2 != inode1) |
375e289ea vfs: pull ext4's ... |
940 941 942 943 944 |
mutex_unlock(&inode2->i_mutex); } EXPORT_SYMBOL(unlock_two_nondirectories); /** |
0b2d0724e fs: simplify iget... |
945 946 947 948 949 950 951 952 953 954 955 956 957 958 959 |
* 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 |
960 |
* |
0b2d0724e fs: simplify iget... |
961 962 |
* Note both @test and @set are called with the inode_hash_lock held, so can't * sleep. |
1da177e4c Linux-2.6.12-rc2 |
963 |
*/ |
0b2d0724e fs: simplify iget... |
964 965 966 |
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 |
967 |
{ |
0b2d0724e fs: simplify iget... |
968 |
struct hlist_head *head = inode_hashtable + hash(sb, hashval); |
6b3304b53 Make checkpatch.p... |
969 |
struct inode *inode; |
1da177e4c Linux-2.6.12-rc2 |
970 |
|
0b2d0724e fs: simplify iget... |
971 972 973 974 975 976 977 978 |
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 |
979 980 |
inode = alloc_inode(sb); if (inode) { |
6b3304b53 Make checkpatch.p... |
981 |
struct inode *old; |
1da177e4c Linux-2.6.12-rc2 |
982 |
|
67a23c494 fs: rename inode_... |
983 |
spin_lock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
984 985 986 987 988 |
/* 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... |
989 990 |
spin_lock(&inode->i_lock); inode->i_state = I_NEW; |
646ec4615 fs: remove inode_... |
991 |
hlist_add_head(&inode->i_hash, head); |
250df6ed2 fs: protect inode... |
992 |
spin_unlock(&inode->i_lock); |
55fa6091d fs: move i_sb_lis... |
993 |
inode_sb_list_add(inode); |
67a23c494 fs: rename inode_... |
994 |
spin_unlock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
995 996 997 998 999 1000 1001 1002 1003 1004 1005 1006 |
/* 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_... |
1007 |
spin_unlock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
1008 1009 1010 1011 1012 1013 1014 |
destroy_inode(inode); inode = old; wait_on_inode(inode); } return inode; set_failed: |
67a23c494 fs: rename inode_... |
1015 |
spin_unlock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
1016 1017 1018 |
destroy_inode(inode); return NULL; } |
0b2d0724e fs: simplify iget... |
1019 |
EXPORT_SYMBOL(iget5_locked); |
1da177e4c Linux-2.6.12-rc2 |
1020 |
|
0b2d0724e fs: simplify iget... |
1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 |
/** * 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 |
1033 |
*/ |
0b2d0724e fs: simplify iget... |
1034 |
struct inode *iget_locked(struct super_block *sb, unsigned long ino) |
1da177e4c Linux-2.6.12-rc2 |
1035 |
{ |
0b2d0724e fs: simplify iget... |
1036 |
struct hlist_head *head = inode_hashtable + hash(sb, ino); |
6b3304b53 Make checkpatch.p... |
1037 |
struct inode *inode; |
1da177e4c Linux-2.6.12-rc2 |
1038 |
|
0b2d0724e fs: simplify iget... |
1039 1040 1041 1042 1043 1044 1045 |
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 |
1046 1047 |
inode = alloc_inode(sb); if (inode) { |
6b3304b53 Make checkpatch.p... |
1048 |
struct inode *old; |
1da177e4c Linux-2.6.12-rc2 |
1049 |
|
67a23c494 fs: rename inode_... |
1050 |
spin_lock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
1051 1052 1053 1054 |
/* We released the lock, so.. */ old = find_inode_fast(sb, head, ino); if (!old) { inode->i_ino = ino; |
250df6ed2 fs: protect inode... |
1055 1056 |
spin_lock(&inode->i_lock); inode->i_state = I_NEW; |
646ec4615 fs: remove inode_... |
1057 |
hlist_add_head(&inode->i_hash, head); |
250df6ed2 fs: protect inode... |
1058 |
spin_unlock(&inode->i_lock); |
55fa6091d fs: move i_sb_lis... |
1059 |
inode_sb_list_add(inode); |
67a23c494 fs: rename inode_... |
1060 |
spin_unlock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 1072 |
/* 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_... |
1073 |
spin_unlock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
1074 1075 1076 1077 1078 1079 |
destroy_inode(inode); inode = old; wait_on_inode(inode); } return inode; } |
0b2d0724e fs: simplify iget... |
1080 |
EXPORT_SYMBOL(iget_locked); |
1da177e4c Linux-2.6.12-rc2 |
1081 |
|
ad5e195ac fs: Stop abusing ... |
1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 |
/* * 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); |
ad5e195ac fs: Stop abusing ... |
1092 |
struct inode *inode; |
67a23c494 fs: rename inode_... |
1093 |
spin_lock(&inode_hash_lock); |
b67bfe0d4 hlist: drop the n... |
1094 |
hlist_for_each_entry(inode, b, i_hash) { |
67a23c494 fs: rename inode_... |
1095 1096 |
if (inode->i_ino == ino && inode->i_sb == sb) { spin_unlock(&inode_hash_lock); |
ad5e195ac fs: Stop abusing ... |
1097 |
return 0; |
67a23c494 fs: rename inode_... |
1098 |
} |
ad5e195ac fs: Stop abusing ... |
1099 |
} |
67a23c494 fs: rename inode_... |
1100 |
spin_unlock(&inode_hash_lock); |
ad5e195ac fs: Stop abusing ... |
1101 1102 1103 |
return 1; } |
1da177e4c Linux-2.6.12-rc2 |
1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 1117 1118 1119 |
/** * 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: ... |
1120 1121 1122 1123 1124 |
/* * 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 ... |
1125 |
static DEFINE_SPINLOCK(iunique_lock); |
866b04fcc inode numbering: ... |
1126 |
static unsigned int counter; |
1da177e4c Linux-2.6.12-rc2 |
1127 |
ino_t res; |
3361c7beb make iunique use ... |
1128 |
|
ad5e195ac fs: Stop abusing ... |
1129 |
spin_lock(&iunique_lock); |
3361c7beb make iunique use ... |
1130 1131 1132 |
do { if (counter <= max_reserved) counter = max_reserved + 1; |
1da177e4c Linux-2.6.12-rc2 |
1133 |
res = counter++; |
ad5e195ac fs: Stop abusing ... |
1134 1135 |
} while (!test_inode_iunique(sb, res)); spin_unlock(&iunique_lock); |
1da177e4c Linux-2.6.12-rc2 |
1136 |
|
3361c7beb make iunique use ... |
1137 1138 |
return res; } |
1da177e4c Linux-2.6.12-rc2 |
1139 1140 1141 1142 |
EXPORT_SYMBOL(iunique); struct inode *igrab(struct inode *inode) { |
250df6ed2 fs: protect inode... |
1143 1144 |
spin_lock(&inode->i_lock); if (!(inode->i_state & (I_FREEING|I_WILL_FREE))) { |
1da177e4c Linux-2.6.12-rc2 |
1145 |
__iget(inode); |
250df6ed2 fs: protect inode... |
1146 1147 1148 |
spin_unlock(&inode->i_lock); } else { spin_unlock(&inode->i_lock); |
1da177e4c Linux-2.6.12-rc2 |
1149 1150 1151 1152 1153 1154 |
/* * 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... |
1155 |
} |
1da177e4c Linux-2.6.12-rc2 |
1156 1157 |
return inode; } |
1da177e4c Linux-2.6.12-rc2 |
1158 1159 1160 |
EXPORT_SYMBOL(igrab); /** |
0b2d0724e fs: simplify iget... |
1161 |
* ilookup5_nowait - search for an inode in the inode cache |
1da177e4c Linux-2.6.12-rc2 |
1162 |
* @sb: super block of file system to search |
0b2d0724e fs: simplify iget... |
1163 |
* @hashval: hash value (usually inode number) to search for |
1da177e4c Linux-2.6.12-rc2 |
1164 1165 |
* @test: callback used for comparisons between inodes * @data: opaque data pointer to pass to @test |
1da177e4c Linux-2.6.12-rc2 |
1166 |
* |
0b2d0724e fs: simplify iget... |
1167 |
* Search for the inode specified by @hashval and @data in the inode cache. |
1da177e4c Linux-2.6.12-rc2 |
1168 1169 1170 |
* If the inode is in the cache, the inode is returned with an incremented * reference count. * |
0b2d0724e fs: simplify iget... |
1171 1172 |
* 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 |
1173 |
* |
b6d0ad686 fs: fix inode.c k... |
1174 |
* Note2: @test is called with the inode_hash_lock held, so can't sleep. |
1da177e4c Linux-2.6.12-rc2 |
1175 |
*/ |
0b2d0724e fs: simplify iget... |
1176 1177 |
struct inode *ilookup5_nowait(struct super_block *sb, unsigned long hashval, int (*test)(struct inode *, void *), void *data) |
1da177e4c Linux-2.6.12-rc2 |
1178 |
{ |
0b2d0724e fs: simplify iget... |
1179 |
struct hlist_head *head = inode_hashtable + hash(sb, hashval); |
1da177e4c Linux-2.6.12-rc2 |
1180 |
struct inode *inode; |
67a23c494 fs: rename inode_... |
1181 |
spin_lock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
1182 |
inode = find_inode(sb, head, test, data); |
67a23c494 fs: rename inode_... |
1183 |
spin_unlock(&inode_hash_lock); |
88bd5121d [PATCH] Fix soft ... |
1184 |
|
0b2d0724e fs: simplify iget... |
1185 |
return inode; |
88bd5121d [PATCH] Fix soft ... |
1186 |
} |
88bd5121d [PATCH] Fix soft ... |
1187 1188 1189 1190 1191 1192 1193 1194 1195 |
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... |
1196 1197 1198 |
* 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 ... |
1199 |
* returned with an incremented reference count. |
1da177e4c Linux-2.6.12-rc2 |
1200 |
* |
0b2d0724e fs: simplify iget... |
1201 1202 |
* 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 |
1203 |
* |
0b2d0724e fs: simplify iget... |
1204 |
* Note: @test is called with the inode_hash_lock held, so can't sleep. |
1da177e4c Linux-2.6.12-rc2 |
1205 1206 1207 1208 |
*/ struct inode *ilookup5(struct super_block *sb, unsigned long hashval, int (*test)(struct inode *, void *), void *data) { |
0b2d0724e fs: simplify iget... |
1209 |
struct inode *inode = ilookup5_nowait(sb, hashval, test, data); |
1da177e4c Linux-2.6.12-rc2 |
1210 |
|
0b2d0724e fs: simplify iget... |
1211 1212 1213 |
if (inode) wait_on_inode(inode); return inode; |
1da177e4c Linux-2.6.12-rc2 |
1214 |
} |
1da177e4c Linux-2.6.12-rc2 |
1215 1216 1217 1218 1219 1220 1221 |
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... |
1222 1223 |
* 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 |
1224 1225 1226 1227 |
*/ 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 |
1228 |
struct inode *inode; |
0b2d0724e fs: simplify iget... |
1229 1230 1231 |
spin_lock(&inode_hash_lock); inode = find_inode_fast(sb, head, ino); spin_unlock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
1232 |
|
1da177e4c Linux-2.6.12-rc2 |
1233 |
if (inode) |
0b2d0724e fs: simplify iget... |
1234 1235 |
wait_on_inode(inode); return inode; |
1da177e4c Linux-2.6.12-rc2 |
1236 |
} |
0b2d0724e fs: simplify iget... |
1237 |
EXPORT_SYMBOL(ilookup); |
1da177e4c Linux-2.6.12-rc2 |
1238 |
|
261bca86e nfsd/create race ... |
1239 1240 1241 1242 1243 |
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 ... |
1244 |
|
261bca86e nfsd/create race ... |
1245 |
while (1) { |
72a43d63c ext3/4 with synch... |
1246 |
struct inode *old = NULL; |
67a23c494 fs: rename inode_... |
1247 |
spin_lock(&inode_hash_lock); |
b67bfe0d4 hlist: drop the n... |
1248 |
hlist_for_each_entry(old, head, i_hash) { |
72a43d63c ext3/4 with synch... |
1249 1250 1251 1252 |
if (old->i_ino != ino) continue; if (old->i_sb != sb) continue; |
250df6ed2 fs: protect inode... |
1253 1254 1255 |
spin_lock(&old->i_lock); if (old->i_state & (I_FREEING|I_WILL_FREE)) { spin_unlock(&old->i_lock); |
72a43d63c ext3/4 with synch... |
1256 |
continue; |
250df6ed2 fs: protect inode... |
1257 |
} |
72a43d63c ext3/4 with synch... |
1258 1259 |
break; } |
b67bfe0d4 hlist: drop the n... |
1260 |
if (likely(!old)) { |
250df6ed2 fs: protect inode... |
1261 1262 |
spin_lock(&inode->i_lock); inode->i_state |= I_NEW; |
261bca86e nfsd/create race ... |
1263 |
hlist_add_head(&inode->i_hash, head); |
250df6ed2 fs: protect inode... |
1264 |
spin_unlock(&inode->i_lock); |
67a23c494 fs: rename inode_... |
1265 |
spin_unlock(&inode_hash_lock); |
261bca86e nfsd/create race ... |
1266 1267 1268 |
return 0; } __iget(old); |
250df6ed2 fs: protect inode... |
1269 |
spin_unlock(&old->i_lock); |
67a23c494 fs: rename inode_... |
1270 |
spin_unlock(&inode_hash_lock); |
261bca86e nfsd/create race ... |
1271 |
wait_on_inode(old); |
1d3382cbf new helper: inode... |
1272 |
if (unlikely(!inode_unhashed(old))) { |
261bca86e nfsd/create race ... |
1273 1274 1275 1276 1277 1278 |
iput(old); return -EBUSY; } iput(old); } } |
261bca86e nfsd/create race ... |
1279 1280 1281 1282 1283 1284 1285 |
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 ... |
1286 |
|
261bca86e nfsd/create race ... |
1287 |
while (1) { |
72a43d63c ext3/4 with synch... |
1288 |
struct inode *old = NULL; |
67a23c494 fs: rename inode_... |
1289 |
spin_lock(&inode_hash_lock); |
b67bfe0d4 hlist: drop the n... |
1290 |
hlist_for_each_entry(old, head, i_hash) { |
72a43d63c ext3/4 with synch... |
1291 1292 1293 1294 |
if (old->i_sb != sb) continue; if (!test(old, data)) continue; |
250df6ed2 fs: protect inode... |
1295 1296 1297 |
spin_lock(&old->i_lock); if (old->i_state & (I_FREEING|I_WILL_FREE)) { spin_unlock(&old->i_lock); |
72a43d63c ext3/4 with synch... |
1298 |
continue; |
250df6ed2 fs: protect inode... |
1299 |
} |
72a43d63c ext3/4 with synch... |
1300 1301 |
break; } |
b67bfe0d4 hlist: drop the n... |
1302 |
if (likely(!old)) { |
250df6ed2 fs: protect inode... |
1303 1304 |
spin_lock(&inode->i_lock); inode->i_state |= I_NEW; |
261bca86e nfsd/create race ... |
1305 |
hlist_add_head(&inode->i_hash, head); |
250df6ed2 fs: protect inode... |
1306 |
spin_unlock(&inode->i_lock); |
67a23c494 fs: rename inode_... |
1307 |
spin_unlock(&inode_hash_lock); |
261bca86e nfsd/create race ... |
1308 1309 1310 |
return 0; } __iget(old); |
250df6ed2 fs: protect inode... |
1311 |
spin_unlock(&old->i_lock); |
67a23c494 fs: rename inode_... |
1312 |
spin_unlock(&inode_hash_lock); |
261bca86e nfsd/create race ... |
1313 |
wait_on_inode(old); |
1d3382cbf new helper: inode... |
1314 |
if (unlikely(!inode_unhashed(old))) { |
261bca86e nfsd/create race ... |
1315 1316 1317 1318 1319 1320 |
iput(old); return -EBUSY; } iput(old); } } |
261bca86e nfsd/create race ... |
1321 |
EXPORT_SYMBOL(insert_inode_locked4); |
1da177e4c Linux-2.6.12-rc2 |
1322 |
|
45321ac54 Make ->drop_inode... |
1323 1324 1325 1326 1327 |
int generic_delete_inode(struct inode *inode) { return 1; } EXPORT_SYMBOL(generic_delete_inode); |
1da177e4c Linux-2.6.12-rc2 |
1328 |
/* |
45321ac54 Make ->drop_inode... |
1329 1330 |
* Called when we're dropping the last reference * to an inode. |
22fe40421 vfs: split generi... |
1331 |
* |
45321ac54 Make ->drop_inode... |
1332 1333 1334 1335 1336 |
* 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... |
1337 |
*/ |
45321ac54 Make ->drop_inode... |
1338 |
static void iput_final(struct inode *inode) |
1da177e4c Linux-2.6.12-rc2 |
1339 1340 |
{ struct super_block *sb = inode->i_sb; |
45321ac54 Make ->drop_inode... |
1341 1342 |
const struct super_operations *op = inode->i_sb->s_op; int drop; |
250df6ed2 fs: protect inode... |
1343 |
WARN_ON(inode->i_state & I_NEW); |
e7f590970 kill useless chec... |
1344 |
if (op->drop_inode) |
45321ac54 Make ->drop_inode... |
1345 1346 1347 |
drop = op->drop_inode(inode); else drop = generic_drop_inode(inode); |
1da177e4c Linux-2.6.12-rc2 |
1348 |
|
b2b2af8e6 fs: factor inode ... |
1349 1350 |
if (!drop && (sb->s_flags & MS_ACTIVE)) { inode->i_state |= I_REFERENCED; |
4eff96dd5 writeback: put un... |
1351 |
inode_add_lru(inode); |
b2b2af8e6 fs: factor inode ... |
1352 |
spin_unlock(&inode->i_lock); |
b2b2af8e6 fs: factor inode ... |
1353 1354 |
return; } |
45321ac54 Make ->drop_inode... |
1355 |
if (!drop) { |
991114c6f [PATCH] fix for p... |
1356 |
inode->i_state |= I_WILL_FREE; |
250df6ed2 fs: protect inode... |
1357 |
spin_unlock(&inode->i_lock); |
1da177e4c Linux-2.6.12-rc2 |
1358 |
write_inode_now(inode, 1); |
250df6ed2 fs: protect inode... |
1359 |
spin_lock(&inode->i_lock); |
7ef0d7377 fs: new inode i_s... |
1360 |
WARN_ON(inode->i_state & I_NEW); |
991114c6f [PATCH] fix for p... |
1361 |
inode->i_state &= ~I_WILL_FREE; |
1da177e4c Linux-2.6.12-rc2 |
1362 |
} |
7ccf19a80 fs: inode split I... |
1363 |
|
991114c6f [PATCH] fix for p... |
1364 |
inode->i_state |= I_FREEING; |
c4ae0c654 vfs: avoid call t... |
1365 1366 |
if (!list_empty(&inode->i_lru)) inode_lru_list_del(inode); |
b2b2af8e6 fs: factor inode ... |
1367 |
spin_unlock(&inode->i_lock); |
b2b2af8e6 fs: factor inode ... |
1368 |
|
644da5960 fs/inode.c:evict(... |
1369 |
evict(inode); |
1da177e4c Linux-2.6.12-rc2 |
1370 |
} |
1da177e4c Linux-2.6.12-rc2 |
1371 |
/** |
6b3304b53 Make checkpatch.p... |
1372 |
* iput - put an inode |
1da177e4c Linux-2.6.12-rc2 |
1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 |
* @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... |
1383 |
BUG_ON(inode->i_state & I_CLEAR); |
1da177e4c Linux-2.6.12-rc2 |
1384 |
|
f283c86af fs: remove inode_... |
1385 |
if (atomic_dec_and_lock(&inode->i_count, &inode->i_lock)) |
1da177e4c Linux-2.6.12-rc2 |
1386 1387 1388 |
iput_final(inode); } } |
1da177e4c Linux-2.6.12-rc2 |
1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 |
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... |
1399 |
* disk block relative to the disk start that holds that block of the |
1da177e4c Linux-2.6.12-rc2 |
1400 1401 |
* file. */ |
6b3304b53 Make checkpatch.p... |
1402 |
sector_t bmap(struct inode *inode, sector_t block) |
1da177e4c Linux-2.6.12-rc2 |
1403 1404 1405 1406 1407 1408 |
{ 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 |
1409 |
EXPORT_SYMBOL(bmap); |
11ff6f05f Allow relatime to... |
1410 1411 1412 1413 1414 1415 1416 1417 1418 1419 1420 1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 |
/* * 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; } |
c3b2da314 fs: introduce ino... |
1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 1454 1455 1456 1457 1458 1459 1460 1461 1462 |
/* * This does the actual work of updating an inodes time or version. Must have * had called mnt_want_write() before calling this. */ static int update_time(struct inode *inode, struct timespec *time, int flags) { if (inode->i_op->update_time) return inode->i_op->update_time(inode, time, flags); if (flags & S_ATIME) inode->i_atime = *time; if (flags & S_VERSION) inode_inc_iversion(inode); if (flags & S_CTIME) inode->i_ctime = *time; if (flags & S_MTIME) inode->i_mtime = *time; mark_inode_dirty_sync(inode); return 0; } |
1da177e4c Linux-2.6.12-rc2 |
1463 |
/** |
869243a0f [PATCH] remove up... |
1464 |
* touch_atime - update the access time |
185553b22 fs: fix inode.c k... |
1465 |
* @path: the &struct path to update |
1da177e4c Linux-2.6.12-rc2 |
1466 1467 1468 1469 1470 |
* * 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. */ |
badcf2b7b constify touch_at... |
1471 |
void touch_atime(const struct path *path) |
1da177e4c Linux-2.6.12-rc2 |
1472 |
{ |
68ac1234f switch touch_atim... |
1473 1474 |
struct vfsmount *mnt = path->mnt; struct inode *inode = path->dentry->d_inode; |
1da177e4c Linux-2.6.12-rc2 |
1475 |
struct timespec now; |
cdb70f3f7 [PATCH] r/o bind ... |
1476 |
if (inode->i_flags & S_NOATIME) |
b12536c27 vfs: optimization... |
1477 |
return; |
37756ced1 [PATCH] avoid one... |
1478 |
if (IS_NOATIME(inode)) |
b12536c27 vfs: optimization... |
1479 |
return; |
b22761384 [PATCH] touch_ati... |
1480 |
if ((inode->i_sb->s_flags & MS_NODIRATIME) && S_ISDIR(inode->i_mode)) |
b12536c27 vfs: optimization... |
1481 |
return; |
47ae32d6a [PATCH] relative ... |
1482 |
|
cdb70f3f7 [PATCH] r/o bind ... |
1483 |
if (mnt->mnt_flags & MNT_NOATIME) |
b12536c27 vfs: optimization... |
1484 |
return; |
cdb70f3f7 [PATCH] r/o bind ... |
1485 |
if ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)) |
b12536c27 vfs: optimization... |
1486 |
return; |
1da177e4c Linux-2.6.12-rc2 |
1487 1488 |
now = current_fs_time(inode->i_sb); |
11ff6f05f Allow relatime to... |
1489 1490 |
if (!relatime_need_update(mnt, inode, now)) |
b12536c27 vfs: optimization... |
1491 |
return; |
11ff6f05f Allow relatime to... |
1492 |
|
47ae32d6a [PATCH] relative ... |
1493 |
if (timespec_equal(&inode->i_atime, &now)) |
b12536c27 vfs: optimization... |
1494 |
return; |
5d37e9e6d fs: Skip atime up... |
1495 |
if (!sb_start_write_trylock(inode->i_sb)) |
b12536c27 vfs: optimization... |
1496 |
return; |
47ae32d6a [PATCH] relative ... |
1497 |
|
5d37e9e6d fs: Skip atime up... |
1498 1499 |
if (__mnt_want_write(mnt)) goto skip_update; |
c3b2da314 fs: introduce ino... |
1500 1501 1502 1503 1504 1505 |
/* * File systems can error out when updating inodes if they need to * allocate new space to modify an inode (such is the case for * Btrfs), but since we touch atime while walking down the path we * really don't care if we failed to update the atime of the file, * so just ignore the return value. |
2bc556528 Btrfs: don't upda... |
1506 1507 |
* We may also fail on filesystems that have the ability to make parts * of the fs read only, e.g. subvolumes in Btrfs. |
c3b2da314 fs: introduce ino... |
1508 1509 |
*/ update_time(inode, &now, S_ATIME); |
5d37e9e6d fs: Skip atime up... |
1510 1511 1512 |
__mnt_drop_write(mnt); skip_update: sb_end_write(inode->i_sb); |
1da177e4c Linux-2.6.12-rc2 |
1513 |
} |
869243a0f [PATCH] remove up... |
1514 |
EXPORT_SYMBOL(touch_atime); |
1da177e4c Linux-2.6.12-rc2 |
1515 |
|
3ed37648e fs: move file_rem... |
1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 1545 1546 1547 1548 1549 |
/* * The logic we want is * * if suid or (sgid and xgrp) * remove privs */ int should_remove_suid(struct dentry *dentry) { umode_t mode = dentry->d_inode->i_mode; int kill = 0; /* suid always must be killed */ if (unlikely(mode & S_ISUID)) kill = ATTR_KILL_SUID; /* * sgid without any exec bits is just a mandatory locking mark; leave * it alone. If some exec bits are set, it's a real sgid; kill it. */ if (unlikely((mode & S_ISGID) && (mode & S_IXGRP))) kill |= ATTR_KILL_SGID; if (unlikely(kill && !capable(CAP_FSETID) && S_ISREG(mode))) return kill; return 0; } EXPORT_SYMBOL(should_remove_suid); static int __remove_suid(struct dentry *dentry, int kill) { struct iattr newattrs; newattrs.ia_valid = ATTR_FORCE | kill; |
27ac0ffea locks: break dele... |
1550 1551 1552 1553 1554 |
/* * Note we call this on write, so notify_change will not * encounter any conflicting delegations: */ return notify_change(dentry, &newattrs, NULL); |
3ed37648e fs: move file_rem... |
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 1580 1581 1582 1583 |
} int file_remove_suid(struct file *file) { struct dentry *dentry = file->f_path.dentry; struct inode *inode = dentry->d_inode; int killsuid; int killpriv; int error = 0; /* Fast path for nothing security related */ if (IS_NOSEC(inode)) return 0; killsuid = should_remove_suid(dentry); killpriv = security_inode_need_killpriv(dentry); if (killpriv < 0) return killpriv; if (killpriv) error = security_inode_killpriv(dentry); if (!error && killsuid) error = __remove_suid(dentry, killsuid); if (!error && (inode->i_sb->s_flags & MS_NOSEC)) inode->i_flags |= S_NOSEC; return error; } EXPORT_SYMBOL(file_remove_suid); |
1da177e4c Linux-2.6.12-rc2 |
1584 |
/** |
870f48179 [PATCH] replace i... |
1585 1586 |
* file_update_time - update mtime and ctime time * @file: file accessed |
1da177e4c Linux-2.6.12-rc2 |
1587 |
* |
870f48179 [PATCH] replace i... |
1588 1589 1590 1591 |
* 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... |
1592 |
* S_NOCMTIME inode flag, e.g. for network filesystem where these |
c3b2da314 fs: introduce ino... |
1593 1594 |
* timestamps are handled by the server. This can return an error for * file systems who need to allocate space in order to update an inode. |
1da177e4c Linux-2.6.12-rc2 |
1595 |
*/ |
c3b2da314 fs: introduce ino... |
1596 |
int file_update_time(struct file *file) |
1da177e4c Linux-2.6.12-rc2 |
1597 |
{ |
496ad9aa8 new helper: file_... |
1598 |
struct inode *inode = file_inode(file); |
1da177e4c Linux-2.6.12-rc2 |
1599 |
struct timespec now; |
c3b2da314 fs: introduce ino... |
1600 1601 |
int sync_it = 0; int ret; |
1da177e4c Linux-2.6.12-rc2 |
1602 |
|
ce06e0b21 vfs: optimize tou... |
1603 |
/* First try to exhaust all avenues to not sync */ |
1da177e4c Linux-2.6.12-rc2 |
1604 |
if (IS_NOCMTIME(inode)) |
c3b2da314 fs: introduce ino... |
1605 |
return 0; |
20ddee2c7 [PATCH] r/o bind ... |
1606 |
|
1da177e4c Linux-2.6.12-rc2 |
1607 |
now = current_fs_time(inode->i_sb); |
ce06e0b21 vfs: optimize tou... |
1608 1609 |
if (!timespec_equal(&inode->i_mtime, &now)) sync_it = S_MTIME; |
1da177e4c Linux-2.6.12-rc2 |
1610 |
|
ce06e0b21 vfs: optimize tou... |
1611 1612 |
if (!timespec_equal(&inode->i_ctime, &now)) sync_it |= S_CTIME; |
870f48179 [PATCH] replace i... |
1613 |
|
ce06e0b21 vfs: optimize tou... |
1614 1615 |
if (IS_I_VERSION(inode)) sync_it |= S_VERSION; |
7a224228e vfs: Add 64 bit i... |
1616 |
|
ce06e0b21 vfs: optimize tou... |
1617 |
if (!sync_it) |
c3b2da314 fs: introduce ino... |
1618 |
return 0; |
ce06e0b21 vfs: optimize tou... |
1619 1620 |
/* Finally allowed to write? Takes lock. */ |
eb04c2828 fs: Add freezing ... |
1621 |
if (__mnt_want_write_file(file)) |
c3b2da314 fs: introduce ino... |
1622 |
return 0; |
ce06e0b21 vfs: optimize tou... |
1623 |
|
c3b2da314 fs: introduce ino... |
1624 |
ret = update_time(inode, &now, sync_it); |
eb04c2828 fs: Add freezing ... |
1625 |
__mnt_drop_write_file(file); |
c3b2da314 fs: introduce ino... |
1626 1627 |
return ret; |
1da177e4c Linux-2.6.12-rc2 |
1628 |
} |
870f48179 [PATCH] replace i... |
1629 |
EXPORT_SYMBOL(file_update_time); |
1da177e4c Linux-2.6.12-rc2 |
1630 1631 1632 1633 1634 1635 1636 1637 1638 |
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 |
1639 |
EXPORT_SYMBOL(inode_needs_sync); |
1da177e4c Linux-2.6.12-rc2 |
1640 |
/* |
168a9fd6a [PATCH] __wait_on... |
1641 1642 1643 1644 1645 1646 |
* 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 |
1647 |
* It doesn't matter if I_NEW is not set initially, a call to |
250df6ed2 fs: protect inode... |
1648 1649 |
* wake_up_bit(&inode->i_state, __I_NEW) after removing from the hash list * will DTRT. |
1da177e4c Linux-2.6.12-rc2 |
1650 1651 1652 1653 |
*/ static void __wait_on_freeing_inode(struct inode *inode) { wait_queue_head_t *wq; |
eaff8079d kill I_LOCK |
1654 1655 |
DEFINE_WAIT_BIT(wait, &inode->i_state, __I_NEW); wq = bit_waitqueue(&inode->i_state, __I_NEW); |
1da177e4c Linux-2.6.12-rc2 |
1656 |
prepare_to_wait(wq, &wait.wait, TASK_UNINTERRUPTIBLE); |
250df6ed2 fs: protect inode... |
1657 |
spin_unlock(&inode->i_lock); |
67a23c494 fs: rename inode_... |
1658 |
spin_unlock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
1659 1660 |
schedule(); finish_wait(wq, &wait.wait); |
67a23c494 fs: rename inode_... |
1661 |
spin_lock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
1662 |
} |
1da177e4c Linux-2.6.12-rc2 |
1663 1664 1665 1666 1667 1668 1669 1670 1671 1672 1673 1674 1675 1676 1677 |
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) { |
074b85175 vfs: fix panic in... |
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unsigned int loop; |
1da177e4c Linux-2.6.12-rc2 |
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/* 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, |
31fe62b95 mm: add a low lim... |
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0, |
1da177e4c Linux-2.6.12-rc2 |
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0); |
074b85175 vfs: fix panic in... |
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for (loop = 0; loop < (1U << i_hash_shift); loop++) |
1da177e4c Linux-2.6.12-rc2 |
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INIT_HLIST_HEAD(&inode_hashtable[loop]); } |
74bf17cff fs: remove the un... |
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void __init inode_init(void) |
1da177e4c Linux-2.6.12-rc2 |
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{ |
074b85175 vfs: fix panic in... |
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unsigned int loop; |
1da177e4c Linux-2.6.12-rc2 |
1702 1703 |
/* inode slab cache */ |
b0196009d [PATCH] cpuset me... |
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inode_cachep = kmem_cache_create("inode_cache", sizeof(struct inode), 0, (SLAB_RECLAIM_ACCOUNT|SLAB_PANIC| SLAB_MEM_SPREAD), |
20c2df83d mm: Remove slab d... |
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init_once); |
1da177e4c Linux-2.6.12-rc2 |
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/* 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, |
31fe62b95 mm: add a low lim... |
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0, |
1da177e4c Linux-2.6.12-rc2 |
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0); |
074b85175 vfs: fix panic in... |
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for (loop = 0; loop < (1U << i_hash_shift); loop++) |
1da177e4c Linux-2.6.12-rc2 |
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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)) |
599a0ac14 pipe: fold file_o... |
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inode->i_fop = &pipefifo_fops; |
1da177e4c Linux-2.6.12-rc2 |
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else if (S_ISSOCK(mode)) |
bd9b51e79 make default ->i_... |
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; /* leave it no_open_fops */ |
1da177e4c Linux-2.6.12-rc2 |
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else |
af0d9ae81 fs/inode.c: add d... |
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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 |
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} EXPORT_SYMBOL(init_special_inode); |
a1bd120d1 vfs: Add inode ui... |
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/** |
eaae668d0 fs/inode: Fix ker... |
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* inode_init_owner - Init uid,gid,mode for new inode according to posix standards |
a1bd120d1 vfs: Add inode ui... |
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* @inode: New inode * @dir: Directory inode * @mode: mode of the new inode */ void inode_init_owner(struct inode *inode, const struct inode *dir, |
62bb10917 switch inode_init... |
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umode_t mode) |
a1bd120d1 vfs: Add inode ui... |
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{ 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... |
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|
2e1496707 userns: rename is... |
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/** * inode_owner_or_capable - check current task permissions to inode * @inode: inode being checked * |
23adbe12e fs,userns: Change... |
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* Return true if current either has CAP_FOWNER in a namespace with the * inode owner uid mapped, or owns the file. |
e795b7179 userns: userns: c... |
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*/ |
2e1496707 userns: rename is... |
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bool inode_owner_or_capable(const struct inode *inode) |
e795b7179 userns: userns: c... |
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{ |
23adbe12e fs,userns: Change... |
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struct user_namespace *ns; |
92361636e userns: Store uid... |
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if (uid_eq(current_fsuid(), inode->i_uid)) |
e795b7179 userns: userns: c... |
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return true; |
23adbe12e fs,userns: Change... |
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ns = current_user_ns(); if (ns_capable(ns, CAP_FOWNER) && kuid_has_mapping(ns, inode->i_uid)) |
e795b7179 userns: userns: c... |
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return true; return false; } |
2e1496707 userns: rename is... |
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EXPORT_SYMBOL(inode_owner_or_capable); |
1d59d61f6 NFS: Ensure that ... |
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/* * Direct i/o helper functions */ static void __inode_dio_wait(struct inode *inode) { wait_queue_head_t *wq = bit_waitqueue(&inode->i_state, __I_DIO_WAKEUP); DEFINE_WAIT_BIT(q, &inode->i_state, __I_DIO_WAKEUP); do { prepare_to_wait(wq, &q.wait, TASK_UNINTERRUPTIBLE); if (atomic_read(&inode->i_dio_count)) schedule(); } while (atomic_read(&inode->i_dio_count)); finish_wait(wq, &q.wait); } /** * inode_dio_wait - wait for outstanding DIO requests to finish * @inode: inode to wait for * * Waits for all pending direct I/O requests to finish so that we can * proceed with a truncate or equivalent operation. * * Must be called under a lock that serializes taking new references * to i_dio_count, usually by inode->i_mutex. */ void inode_dio_wait(struct inode *inode) { if (atomic_read(&inode->i_dio_count)) __inode_dio_wait(inode); } EXPORT_SYMBOL(inode_dio_wait); /* * inode_dio_done - signal finish of a direct I/O requests * @inode: inode the direct I/O happens on * * This is called once we've finished processing a direct I/O request, * and is used to wake up callers waiting for direct I/O to be quiesced. */ void inode_dio_done(struct inode *inode) { if (atomic_dec_and_test(&inode->i_dio_count)) wake_up_bit(&inode->i_state, __I_DIO_WAKEUP); } EXPORT_SYMBOL(inode_dio_done); |
5f16f3225 ext4: atomically ... |
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/* * inode_set_flags - atomically set some inode flags * * Note: the caller should be holding i_mutex, or else be sure that * they have exclusive access to the inode structure (i.e., while the * inode is being instantiated). The reason for the cmpxchg() loop * --- which wouldn't be necessary if all code paths which modify * i_flags actually followed this rule, is that there is at least one * code path which doesn't today --- for example, * __generic_file_aio_write() calls file_remove_suid() without holding * i_mutex --- so we use cmpxchg() out of an abundance of caution. * * In the long run, i_mutex is overkill, and we should probably look * at using the i_lock spinlock to protect i_flags, and then make sure * it is so documented in include/linux/fs.h and that all code follows * the locking convention!! */ void inode_set_flags(struct inode *inode, unsigned int flags, unsigned int mask) { unsigned int old_flags, new_flags; WARN_ON_ONCE(flags & ~mask); do { old_flags = ACCESS_ONCE(inode->i_flags); new_flags = (old_flags & ~mask) | flags; } while (unlikely(cmpxchg(&inode->i_flags, old_flags, new_flags) != old_flags)); } EXPORT_SYMBOL(inode_set_flags); |