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fs/inode.c
45.2 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 <linux/ratelimit.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->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; |
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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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INIT_LIST_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) { printk_ratelimited(KERN_INFO "set_nlink() clearing i_nlink on %s inode %li ", inode->i_sb->s_type->name, inode->i_ino); 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) { if (WARN_ON(inode->i_nlink == 0)) atomic_long_dec(&inode->i_sb->s_remove_count); 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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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); |
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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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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; |
4c51acbc6 fs: Factor inode ... |
446 447 448 449 450 451 452 453 454 455 456 457 |
} /** * __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_... |
458 |
struct hlist_head *b = inode_hashtable + hash(inode->i_sb, hashval); |
67a23c494 fs: rename inode_... |
459 |
spin_lock(&inode_hash_lock); |
250df6ed2 fs: protect inode... |
460 |
spin_lock(&inode->i_lock); |
646ec4615 fs: remove inode_... |
461 |
hlist_add_head(&inode->i_hash, b); |
250df6ed2 fs: protect inode... |
462 |
spin_unlock(&inode->i_lock); |
67a23c494 fs: rename inode_... |
463 |
spin_unlock(&inode_hash_lock); |
4c51acbc6 fs: Factor inode ... |
464 465 466 467 |
} EXPORT_SYMBOL(__insert_inode_hash); /** |
f2ee7abf4 vfs: avoid taking... |
468 |
* __remove_inode_hash - remove an inode from the hash |
4c51acbc6 fs: Factor inode ... |
469 470 471 472 |
* @inode: inode to unhash * * Remove an inode from the superblock. */ |
f2ee7abf4 vfs: avoid taking... |
473 |
void __remove_inode_hash(struct inode *inode) |
4c51acbc6 fs: Factor inode ... |
474 |
{ |
67a23c494 fs: rename inode_... |
475 |
spin_lock(&inode_hash_lock); |
250df6ed2 fs: protect inode... |
476 |
spin_lock(&inode->i_lock); |
4c51acbc6 fs: Factor inode ... |
477 |
hlist_del_init(&inode->i_hash); |
250df6ed2 fs: protect inode... |
478 |
spin_unlock(&inode->i_lock); |
67a23c494 fs: rename inode_... |
479 |
spin_unlock(&inode_hash_lock); |
4c51acbc6 fs: Factor inode ... |
480 |
} |
f2ee7abf4 vfs: avoid taking... |
481 |
EXPORT_SYMBOL(__remove_inode_hash); |
4c51acbc6 fs: Factor inode ... |
482 |
|
b0683aa63 new helper: end_w... |
483 484 485 |
void end_writeback(struct inode *inode) { might_sleep(); |
08142579b mm: fix assertion... |
486 487 488 489 490 491 |
/* * 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... |
492 |
BUG_ON(inode->i_data.nrpages); |
08142579b mm: fix assertion... |
493 |
spin_unlock_irq(&inode->i_data.tree_lock); |
b0683aa63 new helper: end_w... |
494 495 496 497 |
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... |
498 |
/* don't need i_lock here, no concurrent mods to i_state */ |
b0683aa63 new helper: end_w... |
499 500 501 |
inode->i_state = I_FREEING | I_CLEAR; } EXPORT_SYMBOL(end_writeback); |
b2b2af8e6 fs: factor inode ... |
502 503 504 505 506 507 508 509 510 511 512 513 514 |
/* * 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(... |
515 |
static void evict(struct inode *inode) |
b4272d4c8 unify fs/inode.c ... |
516 517 |
{ const struct super_operations *op = inode->i_sb->s_op; |
b2b2af8e6 fs: factor inode ... |
518 519 |
BUG_ON(!(inode->i_state & I_FREEING)); BUG_ON(!list_empty(&inode->i_lru)); |
b12362bdb vfs: conditionall... |
520 521 |
if (!list_empty(&inode->i_wb_list)) inode_wb_list_del(inode); |
55fa6091d fs: move i_sb_lis... |
522 |
inode_sb_list_del(inode); |
be7ce4161 New method - evic... |
523 524 |
if (op->evict_inode) { op->evict_inode(inode); |
b4272d4c8 unify fs/inode.c ... |
525 526 527 |
} else { if (inode->i_data.nrpages) truncate_inode_pages(&inode->i_data, 0); |
30140837f fs/inode.c:clear_... |
528 |
end_writeback(inode); |
b4272d4c8 unify fs/inode.c ... |
529 |
} |
661074e91 Take ->i_bdev/->i... |
530 531 532 533 |
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 ... |
534 535 536 537 538 539 540 541 542 |
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 ... |
543 |
} |
1da177e4c Linux-2.6.12-rc2 |
544 545 546 547 548 549 550 551 552 |
/* * 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 |
553 554 |
while (!list_empty(head)) { struct inode *inode; |
7ccf19a80 fs: inode split I... |
555 556 |
inode = list_first_entry(head, struct inode, i_lru); list_del_init(&inode->i_lru); |
1da177e4c Linux-2.6.12-rc2 |
557 |
|
644da5960 fs/inode.c:evict(... |
558 |
evict(inode); |
1da177e4c Linux-2.6.12-rc2 |
559 |
} |
1da177e4c Linux-2.6.12-rc2 |
560 |
} |
a03187867 fs: fold invalida... |
561 |
/** |
63997e98a split invalidate_... |
562 563 564 565 566 567 568 |
* 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 |
569 |
*/ |
63997e98a split invalidate_... |
570 |
void evict_inodes(struct super_block *sb) |
1da177e4c Linux-2.6.12-rc2 |
571 |
{ |
63997e98a split invalidate_... |
572 573 |
struct inode *inode, *next; LIST_HEAD(dispose); |
1da177e4c Linux-2.6.12-rc2 |
574 |
|
55fa6091d fs: move i_sb_lis... |
575 |
spin_lock(&inode_sb_list_lock); |
63997e98a split invalidate_... |
576 577 |
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... |
578 |
continue; |
250df6ed2 fs: protect inode... |
579 580 581 582 |
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 |
583 |
continue; |
250df6ed2 fs: protect inode... |
584 |
} |
63997e98a split invalidate_... |
585 586 |
inode->i_state |= I_FREEING; |
02afc410f fs: Lock the inod... |
587 |
inode_lru_list_del(inode); |
250df6ed2 fs: protect inode... |
588 |
spin_unlock(&inode->i_lock); |
02afc410f fs: Lock the inod... |
589 |
list_add(&inode->i_lru, &dispose); |
1da177e4c Linux-2.6.12-rc2 |
590 |
} |
55fa6091d fs: move i_sb_lis... |
591 |
spin_unlock(&inode_sb_list_lock); |
63997e98a split invalidate_... |
592 593 |
dispose_list(&dispose); |
1da177e4c Linux-2.6.12-rc2 |
594 |
} |
1da177e4c Linux-2.6.12-rc2 |
595 |
/** |
a03187867 fs: fold invalida... |
596 597 |
* invalidate_inodes - attempt to free all inodes on a superblock * @sb: superblock to operate on |
93b270f76 Fix over-zealous ... |
598 |
* @kill_dirty: flag to guide handling of dirty inodes |
1da177e4c Linux-2.6.12-rc2 |
599 |
* |
a03187867 fs: fold invalida... |
600 601 |
* 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 ... |
602 603 |
* If @kill_dirty is set, discard dirty inodes too, otherwise treat * them as busy. |
1da177e4c Linux-2.6.12-rc2 |
604 |
*/ |
93b270f76 Fix over-zealous ... |
605 |
int invalidate_inodes(struct super_block *sb, bool kill_dirty) |
1da177e4c Linux-2.6.12-rc2 |
606 |
{ |
cffbc8aa3 fs: Convert nr_in... |
607 |
int busy = 0; |
a03187867 fs: fold invalida... |
608 609 |
struct inode *inode, *next; LIST_HEAD(dispose); |
1da177e4c Linux-2.6.12-rc2 |
610 |
|
55fa6091d fs: move i_sb_lis... |
611 |
spin_lock(&inode_sb_list_lock); |
a03187867 fs: fold invalida... |
612 |
list_for_each_entry_safe(inode, next, &sb->s_inodes, i_sb_list) { |
250df6ed2 fs: protect inode... |
613 614 615 |
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... |
616 |
continue; |
250df6ed2 fs: protect inode... |
617 |
} |
93b270f76 Fix over-zealous ... |
618 |
if (inode->i_state & I_DIRTY && !kill_dirty) { |
250df6ed2 fs: protect inode... |
619 |
spin_unlock(&inode->i_lock); |
93b270f76 Fix over-zealous ... |
620 621 622 |
busy = 1; continue; } |
99a389192 fs: fix buffer in... |
623 |
if (atomic_read(&inode->i_count)) { |
250df6ed2 fs: protect inode... |
624 |
spin_unlock(&inode->i_lock); |
99a389192 fs: fix buffer in... |
625 |
busy = 1; |
1da177e4c Linux-2.6.12-rc2 |
626 627 |
continue; } |
99a389192 fs: fix buffer in... |
628 |
|
99a389192 fs: fix buffer in... |
629 |
inode->i_state |= I_FREEING; |
02afc410f fs: Lock the inod... |
630 |
inode_lru_list_del(inode); |
250df6ed2 fs: protect inode... |
631 |
spin_unlock(&inode->i_lock); |
02afc410f fs: Lock the inod... |
632 |
list_add(&inode->i_lru, &dispose); |
1da177e4c Linux-2.6.12-rc2 |
633 |
} |
55fa6091d fs: move i_sb_lis... |
634 |
spin_unlock(&inode_sb_list_lock); |
1da177e4c Linux-2.6.12-rc2 |
635 |
|
a03187867 fs: fold invalida... |
636 |
dispose_list(&dispose); |
1da177e4c Linux-2.6.12-rc2 |
637 638 639 |
return busy; } |
1da177e4c Linux-2.6.12-rc2 |
640 641 642 |
static int can_unuse(struct inode *inode) { |
9e38d86ff fs: Implement laz... |
643 |
if (inode->i_state & ~I_REFERENCED) |
1da177e4c Linux-2.6.12-rc2 |
644 645 646 647 648 649 650 651 652 653 654 |
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... |
655 656 657 658 |
* 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 |
659 660 |
* * Any inodes which are pinned purely because of attached pagecache have their |
9e38d86ff fs: Implement laz... |
661 662 |
* pagecache removed. If the inode has metadata buffers attached to * mapping->private_list then try to remove them. |
1da177e4c Linux-2.6.12-rc2 |
663 |
* |
9e38d86ff fs: Implement laz... |
664 665 666 667 668 669 670 |
* 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 |
671 |
*/ |
b0d40c92a superblock: intro... |
672 |
void prune_icache_sb(struct super_block *sb, int nr_to_scan) |
1da177e4c Linux-2.6.12-rc2 |
673 674 |
{ LIST_HEAD(freeable); |
1da177e4c Linux-2.6.12-rc2 |
675 676 |
int nr_scanned; unsigned long reap = 0; |
09cc9fc7a inode: move to pe... |
677 |
spin_lock(&sb->s_inode_lru_lock); |
b0d40c92a superblock: intro... |
678 |
for (nr_scanned = nr_to_scan; nr_scanned >= 0; nr_scanned--) { |
1da177e4c Linux-2.6.12-rc2 |
679 |
struct inode *inode; |
98b745c64 inode: Make unuse... |
680 |
if (list_empty(&sb->s_inode_lru)) |
1da177e4c Linux-2.6.12-rc2 |
681 |
break; |
98b745c64 inode: Make unuse... |
682 |
inode = list_entry(sb->s_inode_lru.prev, struct inode, i_lru); |
1da177e4c Linux-2.6.12-rc2 |
683 |
|
9e38d86ff fs: Implement laz... |
684 |
/* |
09cc9fc7a inode: move to pe... |
685 |
* we are inverting the sb->s_inode_lru_lock/inode->i_lock here, |
02afc410f fs: Lock the inod... |
686 687 688 689 |
* 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)) { |
62a3ddef6 vfs: fix spinning... |
690 |
list_move_tail(&inode->i_lru, &sb->s_inode_lru); |
02afc410f fs: Lock the inod... |
691 692 693 694 |
continue; } /* |
9e38d86ff fs: Implement laz... |
695 696 697 698 699 |
* 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... |
700 |
list_del_init(&inode->i_lru); |
f283c86af fs: remove inode_... |
701 |
spin_unlock(&inode->i_lock); |
98b745c64 inode: Make unuse... |
702 |
sb->s_nr_inodes_unused--; |
fcb94f72d inode: convert in... |
703 |
this_cpu_dec(nr_unused); |
9e38d86ff fs: Implement laz... |
704 705 706 707 708 |
continue; } /* recently referenced inodes get one more pass */ if (inode->i_state & I_REFERENCED) { |
9e38d86ff fs: Implement laz... |
709 |
inode->i_state &= ~I_REFERENCED; |
98b745c64 inode: Make unuse... |
710 |
list_move(&inode->i_lru, &sb->s_inode_lru); |
f283c86af fs: remove inode_... |
711 |
spin_unlock(&inode->i_lock); |
1da177e4c Linux-2.6.12-rc2 |
712 713 714 715 |
continue; } if (inode_has_buffers(inode) || inode->i_data.nrpages) { __iget(inode); |
250df6ed2 fs: protect inode... |
716 |
spin_unlock(&inode->i_lock); |
09cc9fc7a inode: move to pe... |
717 |
spin_unlock(&sb->s_inode_lru_lock); |
1da177e4c Linux-2.6.12-rc2 |
718 |
if (remove_inode_buffers(inode)) |
fc0ecff69 [PATCH] remove in... |
719 720 |
reap += invalidate_mapping_pages(&inode->i_data, 0, -1); |
1da177e4c Linux-2.6.12-rc2 |
721 |
iput(inode); |
09cc9fc7a inode: move to pe... |
722 |
spin_lock(&sb->s_inode_lru_lock); |
1da177e4c Linux-2.6.12-rc2 |
723 |
|
98b745c64 inode: Make unuse... |
724 |
if (inode != list_entry(sb->s_inode_lru.next, |
7ccf19a80 fs: inode split I... |
725 |
struct inode, i_lru)) |
1da177e4c Linux-2.6.12-rc2 |
726 |
continue; /* wrong inode or list_empty */ |
02afc410f fs: Lock the inod... |
727 728 729 |
/* avoid lock inversions with trylock */ if (!spin_trylock(&inode->i_lock)) continue; |
250df6ed2 fs: protect inode... |
730 731 |
if (!can_unuse(inode)) { spin_unlock(&inode->i_lock); |
1da177e4c Linux-2.6.12-rc2 |
732 |
continue; |
250df6ed2 fs: protect inode... |
733 |
} |
1da177e4c Linux-2.6.12-rc2 |
734 |
} |
7ef0d7377 fs: new inode i_s... |
735 |
WARN_ON(inode->i_state & I_NEW); |
1da177e4c Linux-2.6.12-rc2 |
736 |
inode->i_state |= I_FREEING; |
250df6ed2 fs: protect inode... |
737 |
spin_unlock(&inode->i_lock); |
7ccf19a80 fs: inode split I... |
738 |
|
7ccf19a80 fs: inode split I... |
739 |
list_move(&inode->i_lru, &freeable); |
98b745c64 inode: Make unuse... |
740 |
sb->s_nr_inodes_unused--; |
fcb94f72d inode: convert in... |
741 |
this_cpu_dec(nr_unused); |
1da177e4c Linux-2.6.12-rc2 |
742 |
} |
f8891e5e1 [PATCH] Light wei... |
743 744 745 746 |
if (current_is_kswapd()) __count_vm_events(KSWAPD_INODESTEAL, reap); else __count_vm_events(PGINODESTEAL, reap); |
09cc9fc7a inode: move to pe... |
747 |
spin_unlock(&sb->s_inode_lru_lock); |
5f8aefd44 mm: account reape... |
748 749 |
if (current->reclaim_state) current->reclaim_state->reclaimed_slab += reap; |
1da177e4c Linux-2.6.12-rc2 |
750 751 |
dispose_list(&freeable); |
1da177e4c Linux-2.6.12-rc2 |
752 |
} |
1da177e4c Linux-2.6.12-rc2 |
753 754 755 |
static void __wait_on_freeing_inode(struct inode *inode); /* * Called with the inode lock held. |
1da177e4c Linux-2.6.12-rc2 |
756 |
*/ |
6b3304b53 Make checkpatch.p... |
757 758 759 760 |
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 |
761 762 |
{ struct hlist_node *node; |
6b3304b53 Make checkpatch.p... |
763 |
struct inode *inode = NULL; |
1da177e4c Linux-2.6.12-rc2 |
764 765 |
repeat: |
c5c8be3ce fs/inode.c: use h... |
766 |
hlist_for_each_entry(inode, node, head, i_hash) { |
67a23c494 fs: rename inode_... |
767 768 769 |
spin_lock(&inode->i_lock); if (inode->i_sb != sb) { spin_unlock(&inode->i_lock); |
1da177e4c Linux-2.6.12-rc2 |
770 |
continue; |
67a23c494 fs: rename inode_... |
771 772 773 |
} if (!test(inode, data)) { spin_unlock(&inode->i_lock); |
1da177e4c Linux-2.6.12-rc2 |
774 |
continue; |
67a23c494 fs: rename inode_... |
775 |
} |
a4ffdde6e simplify checks f... |
776 |
if (inode->i_state & (I_FREEING|I_WILL_FREE)) { |
1da177e4c Linux-2.6.12-rc2 |
777 778 779 |
__wait_on_freeing_inode(inode); goto repeat; } |
f7899bd54 fs: move i_count ... |
780 |
__iget(inode); |
250df6ed2 fs: protect inode... |
781 |
spin_unlock(&inode->i_lock); |
f7899bd54 fs: move i_count ... |
782 |
return inode; |
1da177e4c Linux-2.6.12-rc2 |
783 |
} |
f7899bd54 fs: move i_count ... |
784 |
return NULL; |
1da177e4c Linux-2.6.12-rc2 |
785 786 787 788 789 790 |
} /* * find_inode_fast is the fast path version of find_inode, see the comment at * iget_locked for details. */ |
6b3304b53 Make checkpatch.p... |
791 792 |
static struct inode *find_inode_fast(struct super_block *sb, struct hlist_head *head, unsigned long ino) |
1da177e4c Linux-2.6.12-rc2 |
793 794 |
{ struct hlist_node *node; |
6b3304b53 Make checkpatch.p... |
795 |
struct inode *inode = NULL; |
1da177e4c Linux-2.6.12-rc2 |
796 797 |
repeat: |
c5c8be3ce fs/inode.c: use h... |
798 |
hlist_for_each_entry(inode, node, head, i_hash) { |
67a23c494 fs: rename inode_... |
799 800 801 |
spin_lock(&inode->i_lock); if (inode->i_ino != ino) { spin_unlock(&inode->i_lock); |
1da177e4c Linux-2.6.12-rc2 |
802 |
continue; |
67a23c494 fs: rename inode_... |
803 804 805 |
} if (inode->i_sb != sb) { spin_unlock(&inode->i_lock); |
1da177e4c Linux-2.6.12-rc2 |
806 |
continue; |
67a23c494 fs: rename inode_... |
807 |
} |
a4ffdde6e simplify checks f... |
808 |
if (inode->i_state & (I_FREEING|I_WILL_FREE)) { |
1da177e4c Linux-2.6.12-rc2 |
809 810 811 |
__wait_on_freeing_inode(inode); goto repeat; } |
f7899bd54 fs: move i_count ... |
812 |
__iget(inode); |
250df6ed2 fs: protect inode... |
813 |
spin_unlock(&inode->i_lock); |
f7899bd54 fs: move i_count ... |
814 |
return inode; |
1da177e4c Linux-2.6.12-rc2 |
815 |
} |
f7899bd54 fs: move i_count ... |
816 |
return NULL; |
8290c35f8 Inode: Allow exte... |
817 |
} |
f991bd2e1 fs: introduce a p... |
818 819 820 821 |
/* * 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... |
822 |
* |
f991bd2e1 fs: introduce a p... |
823 824 825 826 827 828 829 830 831 |
* 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... |
832 |
*/ |
f991bd2e1 fs: introduce a p... |
833 834 |
#define LAST_INO_BATCH 1024 static DEFINE_PER_CPU(unsigned int, last_ino); |
85fe4025c fs: do not assign... |
835 |
unsigned int get_next_ino(void) |
8290c35f8 Inode: Allow exte... |
836 |
{ |
f991bd2e1 fs: introduce a p... |
837 838 |
unsigned int *p = &get_cpu_var(last_ino); unsigned int res = *p; |
8290c35f8 Inode: Allow exte... |
839 |
|
f991bd2e1 fs: introduce a p... |
840 841 842 843 844 845 846 847 848 849 850 851 |
#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... |
852 |
} |
85fe4025c fs: do not assign... |
853 |
EXPORT_SYMBOL(get_next_ino); |
8290c35f8 Inode: Allow exte... |
854 |
|
1da177e4c Linux-2.6.12-rc2 |
855 |
/** |
a209dfc7b vfs: dont chain p... |
856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 |
* 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 |
879 880 881 |
* new_inode - obtain an inode * @sb: superblock * |
769848c03 Add __GFP_MOVABLE... |
882 |
* Allocates a new inode for given superblock. The default gfp_mask |
3c1d43787 mm: remove GFP_HI... |
883 |
* for allocations related to inode->i_mapping is GFP_HIGHUSER_MOVABLE. |
769848c03 Add __GFP_MOVABLE... |
884 885 886 887 888 |
* 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 |
889 890 891 |
*/ struct inode *new_inode(struct super_block *sb) { |
6b3304b53 Make checkpatch.p... |
892 |
struct inode *inode; |
1da177e4c Linux-2.6.12-rc2 |
893 |
|
55fa6091d fs: move i_sb_lis... |
894 |
spin_lock_prefetch(&inode_sb_list_lock); |
6b3304b53 Make checkpatch.p... |
895 |
|
a209dfc7b vfs: dont chain p... |
896 897 |
inode = new_inode_pseudo(sb); if (inode) |
55fa6091d fs: move i_sb_lis... |
898 |
inode_sb_list_add(inode); |
1da177e4c Linux-2.6.12-rc2 |
899 900 |
return inode; } |
1da177e4c Linux-2.6.12-rc2 |
901 |
EXPORT_SYMBOL(new_inode); |
14358e6dd lockdep: annotate... |
902 |
#ifdef CONFIG_DEBUG_LOCK_ALLOC |
e096d0c7e lockdep: Add help... |
903 904 |
void lockdep_annotate_inode_mutex_key(struct inode *inode) { |
a3314a0ed lockdep: fixup ch... |
905 |
if (S_ISDIR(inode->i_mode)) { |
1e89a5e15 lockdep: fixup th... |
906 |
struct file_system_type *type = inode->i_sb->s_type; |
9a7aa12f3 vfs: Set special ... |
907 908 909 910 911 912 913 914 915 916 917 |
/* 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... |
918 |
} |
e096d0c7e lockdep: Add help... |
919 920 |
} EXPORT_SYMBOL(lockdep_annotate_inode_mutex_key); |
14358e6dd lockdep: annotate... |
921 |
#endif |
e096d0c7e lockdep: Add help... |
922 923 924 925 926 927 928 929 930 931 932 |
/** * 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... |
933 |
spin_lock(&inode->i_lock); |
eaff8079d kill I_LOCK |
934 935 |
WARN_ON(!(inode->i_state & I_NEW)); inode->i_state &= ~I_NEW; |
250df6ed2 fs: protect inode... |
936 937 |
wake_up_bit(&inode->i_state, __I_NEW); spin_unlock(&inode->i_lock); |
1da177e4c Linux-2.6.12-rc2 |
938 |
} |
1da177e4c Linux-2.6.12-rc2 |
939 |
EXPORT_SYMBOL(unlock_new_inode); |
0b2d0724e fs: simplify iget... |
940 941 942 943 944 945 946 947 948 949 950 951 952 953 954 955 |
/** * 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 |
956 |
* |
0b2d0724e fs: simplify iget... |
957 958 |
* Note both @test and @set are called with the inode_hash_lock held, so can't * sleep. |
1da177e4c Linux-2.6.12-rc2 |
959 |
*/ |
0b2d0724e fs: simplify iget... |
960 961 962 |
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 |
963 |
{ |
0b2d0724e fs: simplify iget... |
964 |
struct hlist_head *head = inode_hashtable + hash(sb, hashval); |
6b3304b53 Make checkpatch.p... |
965 |
struct inode *inode; |
1da177e4c Linux-2.6.12-rc2 |
966 |
|
0b2d0724e fs: simplify iget... |
967 968 969 970 971 972 973 974 |
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 |
975 976 |
inode = alloc_inode(sb); if (inode) { |
6b3304b53 Make checkpatch.p... |
977 |
struct inode *old; |
1da177e4c Linux-2.6.12-rc2 |
978 |
|
67a23c494 fs: rename inode_... |
979 |
spin_lock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
980 981 982 983 984 |
/* 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... |
985 986 |
spin_lock(&inode->i_lock); inode->i_state = I_NEW; |
646ec4615 fs: remove inode_... |
987 |
hlist_add_head(&inode->i_hash, head); |
250df6ed2 fs: protect inode... |
988 |
spin_unlock(&inode->i_lock); |
55fa6091d fs: move i_sb_lis... |
989 |
inode_sb_list_add(inode); |
67a23c494 fs: rename inode_... |
990 |
spin_unlock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
991 992 993 994 995 996 997 998 999 1000 1001 1002 |
/* 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_... |
1003 |
spin_unlock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
1004 1005 1006 1007 1008 1009 1010 |
destroy_inode(inode); inode = old; wait_on_inode(inode); } return inode; set_failed: |
67a23c494 fs: rename inode_... |
1011 |
spin_unlock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
1012 1013 1014 |
destroy_inode(inode); return NULL; } |
0b2d0724e fs: simplify iget... |
1015 |
EXPORT_SYMBOL(iget5_locked); |
1da177e4c Linux-2.6.12-rc2 |
1016 |
|
0b2d0724e fs: simplify iget... |
1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 |
/** * 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 |
1029 |
*/ |
0b2d0724e fs: simplify iget... |
1030 |
struct inode *iget_locked(struct super_block *sb, unsigned long ino) |
1da177e4c Linux-2.6.12-rc2 |
1031 |
{ |
0b2d0724e fs: simplify iget... |
1032 |
struct hlist_head *head = inode_hashtable + hash(sb, ino); |
6b3304b53 Make checkpatch.p... |
1033 |
struct inode *inode; |
1da177e4c Linux-2.6.12-rc2 |
1034 |
|
0b2d0724e fs: simplify iget... |
1035 1036 1037 1038 1039 1040 1041 |
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 |
1042 1043 |
inode = alloc_inode(sb); if (inode) { |
6b3304b53 Make checkpatch.p... |
1044 |
struct inode *old; |
1da177e4c Linux-2.6.12-rc2 |
1045 |
|
67a23c494 fs: rename inode_... |
1046 |
spin_lock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
1047 1048 1049 1050 |
/* We released the lock, so.. */ old = find_inode_fast(sb, head, ino); if (!old) { inode->i_ino = ino; |
250df6ed2 fs: protect inode... |
1051 1052 |
spin_lock(&inode->i_lock); inode->i_state = I_NEW; |
646ec4615 fs: remove inode_... |
1053 |
hlist_add_head(&inode->i_hash, head); |
250df6ed2 fs: protect inode... |
1054 |
spin_unlock(&inode->i_lock); |
55fa6091d fs: move i_sb_lis... |
1055 |
inode_sb_list_add(inode); |
67a23c494 fs: rename inode_... |
1056 |
spin_unlock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 |
/* 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_... |
1069 |
spin_unlock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
1070 1071 1072 1073 1074 1075 |
destroy_inode(inode); inode = old; wait_on_inode(inode); } return inode; } |
0b2d0724e fs: simplify iget... |
1076 |
EXPORT_SYMBOL(iget_locked); |
1da177e4c Linux-2.6.12-rc2 |
1077 |
|
ad5e195ac fs: Stop abusing ... |
1078 1079 1080 1081 1082 1083 1084 1085 1086 1087 1088 1089 |
/* * 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_... |
1090 |
spin_lock(&inode_hash_lock); |
ad5e195ac fs: Stop abusing ... |
1091 |
hlist_for_each_entry(inode, node, b, i_hash) { |
67a23c494 fs: rename inode_... |
1092 1093 |
if (inode->i_ino == ino && inode->i_sb == sb) { spin_unlock(&inode_hash_lock); |
ad5e195ac fs: Stop abusing ... |
1094 |
return 0; |
67a23c494 fs: rename inode_... |
1095 |
} |
ad5e195ac fs: Stop abusing ... |
1096 |
} |
67a23c494 fs: rename inode_... |
1097 |
spin_unlock(&inode_hash_lock); |
ad5e195ac fs: Stop abusing ... |
1098 1099 1100 |
return 1; } |
1da177e4c Linux-2.6.12-rc2 |
1101 1102 1103 1104 1105 1106 1107 1108 1109 1110 1111 1112 1113 1114 1115 1116 |
/** * 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: ... |
1117 1118 1119 1120 1121 |
/* * 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 ... |
1122 |
static DEFINE_SPINLOCK(iunique_lock); |
866b04fcc inode numbering: ... |
1123 |
static unsigned int counter; |
1da177e4c Linux-2.6.12-rc2 |
1124 |
ino_t res; |
3361c7beb make iunique use ... |
1125 |
|
ad5e195ac fs: Stop abusing ... |
1126 |
spin_lock(&iunique_lock); |
3361c7beb make iunique use ... |
1127 1128 1129 |
do { if (counter <= max_reserved) counter = max_reserved + 1; |
1da177e4c Linux-2.6.12-rc2 |
1130 |
res = counter++; |
ad5e195ac fs: Stop abusing ... |
1131 1132 |
} while (!test_inode_iunique(sb, res)); spin_unlock(&iunique_lock); |
1da177e4c Linux-2.6.12-rc2 |
1133 |
|
3361c7beb make iunique use ... |
1134 1135 |
return res; } |
1da177e4c Linux-2.6.12-rc2 |
1136 1137 1138 1139 |
EXPORT_SYMBOL(iunique); struct inode *igrab(struct inode *inode) { |
250df6ed2 fs: protect inode... |
1140 1141 |
spin_lock(&inode->i_lock); if (!(inode->i_state & (I_FREEING|I_WILL_FREE))) { |
1da177e4c Linux-2.6.12-rc2 |
1142 |
__iget(inode); |
250df6ed2 fs: protect inode... |
1143 1144 1145 |
spin_unlock(&inode->i_lock); } else { spin_unlock(&inode->i_lock); |
1da177e4c Linux-2.6.12-rc2 |
1146 1147 1148 1149 1150 1151 |
/* * 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... |
1152 |
} |
1da177e4c Linux-2.6.12-rc2 |
1153 1154 |
return inode; } |
1da177e4c Linux-2.6.12-rc2 |
1155 1156 1157 |
EXPORT_SYMBOL(igrab); /** |
0b2d0724e fs: simplify iget... |
1158 |
* ilookup5_nowait - search for an inode in the inode cache |
1da177e4c Linux-2.6.12-rc2 |
1159 |
* @sb: super block of file system to search |
0b2d0724e fs: simplify iget... |
1160 |
* @hashval: hash value (usually inode number) to search for |
1da177e4c Linux-2.6.12-rc2 |
1161 1162 |
* @test: callback used for comparisons between inodes * @data: opaque data pointer to pass to @test |
1da177e4c Linux-2.6.12-rc2 |
1163 |
* |
0b2d0724e fs: simplify iget... |
1164 |
* Search for the inode specified by @hashval and @data in the inode cache. |
1da177e4c Linux-2.6.12-rc2 |
1165 1166 1167 |
* If the inode is in the cache, the inode is returned with an incremented * reference count. * |
0b2d0724e fs: simplify iget... |
1168 1169 |
* 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 |
1170 |
* |
b6d0ad686 fs: fix inode.c k... |
1171 |
* Note2: @test is called with the inode_hash_lock held, so can't sleep. |
1da177e4c Linux-2.6.12-rc2 |
1172 |
*/ |
0b2d0724e fs: simplify iget... |
1173 1174 |
struct inode *ilookup5_nowait(struct super_block *sb, unsigned long hashval, int (*test)(struct inode *, void *), void *data) |
1da177e4c Linux-2.6.12-rc2 |
1175 |
{ |
0b2d0724e fs: simplify iget... |
1176 |
struct hlist_head *head = inode_hashtable + hash(sb, hashval); |
1da177e4c Linux-2.6.12-rc2 |
1177 |
struct inode *inode; |
67a23c494 fs: rename inode_... |
1178 |
spin_lock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
1179 |
inode = find_inode(sb, head, test, data); |
67a23c494 fs: rename inode_... |
1180 |
spin_unlock(&inode_hash_lock); |
88bd5121d [PATCH] Fix soft ... |
1181 |
|
0b2d0724e fs: simplify iget... |
1182 |
return inode; |
88bd5121d [PATCH] Fix soft ... |
1183 |
} |
88bd5121d [PATCH] Fix soft ... |
1184 1185 1186 1187 1188 1189 1190 1191 1192 |
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... |
1193 1194 1195 |
* 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 ... |
1196 |
* returned with an incremented reference count. |
1da177e4c Linux-2.6.12-rc2 |
1197 |
* |
0b2d0724e fs: simplify iget... |
1198 1199 |
* 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 |
1200 |
* |
0b2d0724e fs: simplify iget... |
1201 |
* Note: @test is called with the inode_hash_lock held, so can't sleep. |
1da177e4c Linux-2.6.12-rc2 |
1202 1203 1204 1205 |
*/ struct inode *ilookup5(struct super_block *sb, unsigned long hashval, int (*test)(struct inode *, void *), void *data) { |
0b2d0724e fs: simplify iget... |
1206 |
struct inode *inode = ilookup5_nowait(sb, hashval, test, data); |
1da177e4c Linux-2.6.12-rc2 |
1207 |
|
0b2d0724e fs: simplify iget... |
1208 1209 1210 |
if (inode) wait_on_inode(inode); return inode; |
1da177e4c Linux-2.6.12-rc2 |
1211 |
} |
1da177e4c Linux-2.6.12-rc2 |
1212 1213 1214 1215 1216 1217 1218 |
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... |
1219 1220 |
* 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 |
1221 1222 1223 1224 |
*/ 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 |
1225 |
struct inode *inode; |
0b2d0724e fs: simplify iget... |
1226 1227 1228 |
spin_lock(&inode_hash_lock); inode = find_inode_fast(sb, head, ino); spin_unlock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
1229 |
|
1da177e4c Linux-2.6.12-rc2 |
1230 |
if (inode) |
0b2d0724e fs: simplify iget... |
1231 1232 |
wait_on_inode(inode); return inode; |
1da177e4c Linux-2.6.12-rc2 |
1233 |
} |
0b2d0724e fs: simplify iget... |
1234 |
EXPORT_SYMBOL(ilookup); |
1da177e4c Linux-2.6.12-rc2 |
1235 |
|
261bca86e nfsd/create race ... |
1236 1237 1238 1239 1240 |
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 ... |
1241 |
|
261bca86e nfsd/create race ... |
1242 |
while (1) { |
72a43d63c ext3/4 with synch... |
1243 1244 |
struct hlist_node *node; struct inode *old = NULL; |
67a23c494 fs: rename inode_... |
1245 |
spin_lock(&inode_hash_lock); |
72a43d63c ext3/4 with synch... |
1246 1247 1248 1249 1250 |
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... |
1251 1252 1253 |
spin_lock(&old->i_lock); if (old->i_state & (I_FREEING|I_WILL_FREE)) { spin_unlock(&old->i_lock); |
72a43d63c ext3/4 with synch... |
1254 |
continue; |
250df6ed2 fs: protect inode... |
1255 |
} |
72a43d63c ext3/4 with synch... |
1256 1257 1258 |
break; } if (likely(!node)) { |
250df6ed2 fs: protect inode... |
1259 1260 |
spin_lock(&inode->i_lock); inode->i_state |= I_NEW; |
261bca86e nfsd/create race ... |
1261 |
hlist_add_head(&inode->i_hash, head); |
250df6ed2 fs: protect inode... |
1262 |
spin_unlock(&inode->i_lock); |
67a23c494 fs: rename inode_... |
1263 |
spin_unlock(&inode_hash_lock); |
261bca86e nfsd/create race ... |
1264 1265 1266 |
return 0; } __iget(old); |
250df6ed2 fs: protect inode... |
1267 |
spin_unlock(&old->i_lock); |
67a23c494 fs: rename inode_... |
1268 |
spin_unlock(&inode_hash_lock); |
261bca86e nfsd/create race ... |
1269 |
wait_on_inode(old); |
1d3382cbf new helper: inode... |
1270 |
if (unlikely(!inode_unhashed(old))) { |
261bca86e nfsd/create race ... |
1271 1272 1273 1274 1275 1276 |
iput(old); return -EBUSY; } iput(old); } } |
261bca86e nfsd/create race ... |
1277 1278 1279 1280 1281 1282 1283 |
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 ... |
1284 |
|
261bca86e nfsd/create race ... |
1285 |
while (1) { |
72a43d63c ext3/4 with synch... |
1286 1287 |
struct hlist_node *node; struct inode *old = NULL; |
67a23c494 fs: rename inode_... |
1288 |
spin_lock(&inode_hash_lock); |
72a43d63c ext3/4 with synch... |
1289 1290 1291 1292 1293 |
hlist_for_each_entry(old, node, head, i_hash) { if (old->i_sb != sb) continue; if (!test(old, data)) continue; |
250df6ed2 fs: protect inode... |
1294 1295 1296 |
spin_lock(&old->i_lock); if (old->i_state & (I_FREEING|I_WILL_FREE)) { spin_unlock(&old->i_lock); |
72a43d63c ext3/4 with synch... |
1297 |
continue; |
250df6ed2 fs: protect inode... |
1298 |
} |
72a43d63c ext3/4 with synch... |
1299 1300 1301 |
break; } if (likely(!node)) { |
250df6ed2 fs: protect inode... |
1302 1303 |
spin_lock(&inode->i_lock); inode->i_state |= I_NEW; |
261bca86e nfsd/create race ... |
1304 |
hlist_add_head(&inode->i_hash, head); |
250df6ed2 fs: protect inode... |
1305 |
spin_unlock(&inode->i_lock); |
67a23c494 fs: rename inode_... |
1306 |
spin_unlock(&inode_hash_lock); |
261bca86e nfsd/create race ... |
1307 1308 1309 |
return 0; } __iget(old); |
250df6ed2 fs: protect inode... |
1310 |
spin_unlock(&old->i_lock); |
67a23c494 fs: rename inode_... |
1311 |
spin_unlock(&inode_hash_lock); |
261bca86e nfsd/create race ... |
1312 |
wait_on_inode(old); |
1d3382cbf new helper: inode... |
1313 |
if (unlikely(!inode_unhashed(old))) { |
261bca86e nfsd/create race ... |
1314 1315 1316 1317 1318 1319 |
iput(old); return -EBUSY; } iput(old); } } |
261bca86e nfsd/create race ... |
1320 |
EXPORT_SYMBOL(insert_inode_locked4); |
1da177e4c Linux-2.6.12-rc2 |
1321 |
|
45321ac54 Make ->drop_inode... |
1322 1323 1324 1325 1326 |
int generic_delete_inode(struct inode *inode) { return 1; } EXPORT_SYMBOL(generic_delete_inode); |
1da177e4c Linux-2.6.12-rc2 |
1327 |
/* |
45321ac54 Make ->drop_inode... |
1328 1329 1330 |
* 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 |
1331 |
*/ |
45321ac54 Make ->drop_inode... |
1332 |
int generic_drop_inode(struct inode *inode) |
1da177e4c Linux-2.6.12-rc2 |
1333 |
{ |
1d3382cbf new helper: inode... |
1334 |
return !inode->i_nlink || inode_unhashed(inode); |
1da177e4c Linux-2.6.12-rc2 |
1335 |
} |
45321ac54 Make ->drop_inode... |
1336 |
EXPORT_SYMBOL_GPL(generic_drop_inode); |
1da177e4c Linux-2.6.12-rc2 |
1337 |
|
45321ac54 Make ->drop_inode... |
1338 1339 1340 |
/* * Called when we're dropping the last reference * to an inode. |
22fe40421 vfs: split generi... |
1341 |
* |
45321ac54 Make ->drop_inode... |
1342 1343 1344 1345 1346 |
* 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... |
1347 |
*/ |
45321ac54 Make ->drop_inode... |
1348 |
static void iput_final(struct inode *inode) |
1da177e4c Linux-2.6.12-rc2 |
1349 1350 |
{ struct super_block *sb = inode->i_sb; |
45321ac54 Make ->drop_inode... |
1351 1352 |
const struct super_operations *op = inode->i_sb->s_op; int drop; |
250df6ed2 fs: protect inode... |
1353 |
WARN_ON(inode->i_state & I_NEW); |
e7f590970 kill useless chec... |
1354 |
if (op->drop_inode) |
45321ac54 Make ->drop_inode... |
1355 1356 1357 |
drop = op->drop_inode(inode); else drop = generic_drop_inode(inode); |
1da177e4c Linux-2.6.12-rc2 |
1358 |
|
b2b2af8e6 fs: factor inode ... |
1359 1360 1361 1362 1363 |
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 ... |
1364 1365 |
return; } |
45321ac54 Make ->drop_inode... |
1366 |
if (!drop) { |
991114c6f [PATCH] fix for p... |
1367 |
inode->i_state |= I_WILL_FREE; |
250df6ed2 fs: protect inode... |
1368 |
spin_unlock(&inode->i_lock); |
1da177e4c Linux-2.6.12-rc2 |
1369 |
write_inode_now(inode, 1); |
250df6ed2 fs: protect inode... |
1370 |
spin_lock(&inode->i_lock); |
7ef0d7377 fs: new inode i_s... |
1371 |
WARN_ON(inode->i_state & I_NEW); |
991114c6f [PATCH] fix for p... |
1372 |
inode->i_state &= ~I_WILL_FREE; |
1da177e4c Linux-2.6.12-rc2 |
1373 |
} |
7ccf19a80 fs: inode split I... |
1374 |
|
991114c6f [PATCH] fix for p... |
1375 |
inode->i_state |= I_FREEING; |
c4ae0c654 vfs: avoid call t... |
1376 1377 |
if (!list_empty(&inode->i_lru)) inode_lru_list_del(inode); |
b2b2af8e6 fs: factor inode ... |
1378 |
spin_unlock(&inode->i_lock); |
b2b2af8e6 fs: factor inode ... |
1379 |
|
644da5960 fs/inode.c:evict(... |
1380 |
evict(inode); |
1da177e4c Linux-2.6.12-rc2 |
1381 |
} |
1da177e4c Linux-2.6.12-rc2 |
1382 |
/** |
6b3304b53 Make checkpatch.p... |
1383 |
* iput - put an inode |
1da177e4c Linux-2.6.12-rc2 |
1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 |
* @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... |
1394 |
BUG_ON(inode->i_state & I_CLEAR); |
1da177e4c Linux-2.6.12-rc2 |
1395 |
|
f283c86af fs: remove inode_... |
1396 |
if (atomic_dec_and_lock(&inode->i_count, &inode->i_lock)) |
1da177e4c Linux-2.6.12-rc2 |
1397 1398 1399 |
iput_final(inode); } } |
1da177e4c Linux-2.6.12-rc2 |
1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 |
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... |
1410 |
* disk block relative to the disk start that holds that block of the |
1da177e4c Linux-2.6.12-rc2 |
1411 1412 |
* file. */ |
6b3304b53 Make checkpatch.p... |
1413 |
sector_t bmap(struct inode *inode, sector_t block) |
1da177e4c Linux-2.6.12-rc2 |
1414 1415 1416 1417 1418 1419 |
{ 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 |
1420 |
EXPORT_SYMBOL(bmap); |
11ff6f05f Allow relatime to... |
1421 1422 1423 1424 1425 1426 1427 1428 1429 1430 1431 1432 1433 1434 1435 1436 1437 1438 1439 1440 1441 1442 1443 1444 1445 1446 1447 1448 1449 1450 1451 1452 1453 |
/* * 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 |
1454 |
/** |
869243a0f [PATCH] remove up... |
1455 1456 |
* touch_atime - update the access time * @mnt: mount the inode is accessed on |
7045f37b1 [PATCH] DocBook: ... |
1457 |
* @dentry: dentry accessed |
1da177e4c Linux-2.6.12-rc2 |
1458 1459 1460 1461 1462 |
* * 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... |
1463 |
void touch_atime(struct vfsmount *mnt, struct dentry *dentry) |
1da177e4c Linux-2.6.12-rc2 |
1464 |
{ |
869243a0f [PATCH] remove up... |
1465 |
struct inode *inode = dentry->d_inode; |
1da177e4c Linux-2.6.12-rc2 |
1466 |
struct timespec now; |
cdb70f3f7 [PATCH] r/o bind ... |
1467 |
if (inode->i_flags & S_NOATIME) |
b12536c27 vfs: optimization... |
1468 |
return; |
37756ced1 [PATCH] avoid one... |
1469 |
if (IS_NOATIME(inode)) |
b12536c27 vfs: optimization... |
1470 |
return; |
b22761384 [PATCH] touch_ati... |
1471 |
if ((inode->i_sb->s_flags & MS_NODIRATIME) && S_ISDIR(inode->i_mode)) |
b12536c27 vfs: optimization... |
1472 |
return; |
47ae32d6a [PATCH] relative ... |
1473 |
|
cdb70f3f7 [PATCH] r/o bind ... |
1474 |
if (mnt->mnt_flags & MNT_NOATIME) |
b12536c27 vfs: optimization... |
1475 |
return; |
cdb70f3f7 [PATCH] r/o bind ... |
1476 |
if ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)) |
b12536c27 vfs: optimization... |
1477 |
return; |
1da177e4c Linux-2.6.12-rc2 |
1478 1479 |
now = current_fs_time(inode->i_sb); |
11ff6f05f Allow relatime to... |
1480 1481 |
if (!relatime_need_update(mnt, inode, now)) |
b12536c27 vfs: optimization... |
1482 |
return; |
11ff6f05f Allow relatime to... |
1483 |
|
47ae32d6a [PATCH] relative ... |
1484 |
if (timespec_equal(&inode->i_atime, &now)) |
b12536c27 vfs: optimization... |
1485 1486 1487 1488 |
return; if (mnt_want_write(mnt)) return; |
47ae32d6a [PATCH] relative ... |
1489 1490 1491 |
inode->i_atime = now; mark_inode_dirty_sync(inode); |
cdb70f3f7 [PATCH] r/o bind ... |
1492 |
mnt_drop_write(mnt); |
1da177e4c Linux-2.6.12-rc2 |
1493 |
} |
869243a0f [PATCH] remove up... |
1494 |
EXPORT_SYMBOL(touch_atime); |
1da177e4c Linux-2.6.12-rc2 |
1495 1496 |
/** |
870f48179 [PATCH] replace i... |
1497 1498 |
* file_update_time - update mtime and ctime time * @file: file accessed |
1da177e4c Linux-2.6.12-rc2 |
1499 |
* |
870f48179 [PATCH] replace i... |
1500 1501 1502 1503 |
* 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... |
1504 |
* S_NOCMTIME inode flag, e.g. for network filesystem where these |
870f48179 [PATCH] replace i... |
1505 |
* timestamps are handled by the server. |
1da177e4c Linux-2.6.12-rc2 |
1506 |
*/ |
870f48179 [PATCH] replace i... |
1507 |
void file_update_time(struct file *file) |
1da177e4c Linux-2.6.12-rc2 |
1508 |
{ |
0f7fc9e4d [PATCH] VFS: chan... |
1509 |
struct inode *inode = file->f_path.dentry->d_inode; |
1da177e4c Linux-2.6.12-rc2 |
1510 |
struct timespec now; |
ce06e0b21 vfs: optimize tou... |
1511 |
enum { S_MTIME = 1, S_CTIME = 2, S_VERSION = 4 } sync_it = 0; |
1da177e4c Linux-2.6.12-rc2 |
1512 |
|
ce06e0b21 vfs: optimize tou... |
1513 |
/* First try to exhaust all avenues to not sync */ |
1da177e4c Linux-2.6.12-rc2 |
1514 1515 |
if (IS_NOCMTIME(inode)) return; |
20ddee2c7 [PATCH] r/o bind ... |
1516 |
|
1da177e4c Linux-2.6.12-rc2 |
1517 |
now = current_fs_time(inode->i_sb); |
ce06e0b21 vfs: optimize tou... |
1518 1519 |
if (!timespec_equal(&inode->i_mtime, &now)) sync_it = S_MTIME; |
1da177e4c Linux-2.6.12-rc2 |
1520 |
|
ce06e0b21 vfs: optimize tou... |
1521 1522 |
if (!timespec_equal(&inode->i_ctime, &now)) sync_it |= S_CTIME; |
870f48179 [PATCH] replace i... |
1523 |
|
ce06e0b21 vfs: optimize tou... |
1524 1525 |
if (IS_I_VERSION(inode)) sync_it |= S_VERSION; |
7a224228e vfs: Add 64 bit i... |
1526 |
|
ce06e0b21 vfs: optimize tou... |
1527 1528 1529 1530 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 |
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); |
2a79f17e4 vfs: mnt_drop_wri... |
1542 |
mnt_drop_write_file(file); |
1da177e4c Linux-2.6.12-rc2 |
1543 |
} |
870f48179 [PATCH] replace i... |
1544 |
EXPORT_SYMBOL(file_update_time); |
1da177e4c Linux-2.6.12-rc2 |
1545 1546 1547 1548 1549 1550 1551 1552 1553 |
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 |
1554 |
EXPORT_SYMBOL(inode_needs_sync); |
1da177e4c Linux-2.6.12-rc2 |
1555 1556 1557 1558 1559 |
int inode_wait(void *word) { schedule(); return 0; } |
d44dab8d1 fs: xfs needs ino... |
1560 |
EXPORT_SYMBOL(inode_wait); |
1da177e4c Linux-2.6.12-rc2 |
1561 1562 |
/* |
168a9fd6a [PATCH] __wait_on... |
1563 1564 1565 1566 1567 1568 |
* 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 |
1569 |
* It doesn't matter if I_NEW is not set initially, a call to |
250df6ed2 fs: protect inode... |
1570 1571 |
* wake_up_bit(&inode->i_state, __I_NEW) after removing from the hash list * will DTRT. |
1da177e4c Linux-2.6.12-rc2 |
1572 1573 1574 1575 |
*/ static void __wait_on_freeing_inode(struct inode *inode) { wait_queue_head_t *wq; |
eaff8079d kill I_LOCK |
1576 1577 |
DEFINE_WAIT_BIT(wait, &inode->i_state, __I_NEW); wq = bit_waitqueue(&inode->i_state, __I_NEW); |
1da177e4c Linux-2.6.12-rc2 |
1578 |
prepare_to_wait(wq, &wait.wait, TASK_UNINTERRUPTIBLE); |
250df6ed2 fs: protect inode... |
1579 |
spin_unlock(&inode->i_lock); |
67a23c494 fs: rename inode_... |
1580 |
spin_unlock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
1581 1582 |
schedule(); finish_wait(wq, &wait.wait); |
67a23c494 fs: rename inode_... |
1583 |
spin_lock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
1584 |
} |
1da177e4c Linux-2.6.12-rc2 |
1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 |
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... |
1621 |
void __init inode_init(void) |
1da177e4c Linux-2.6.12-rc2 |
1622 1623 1624 1625 |
{ int loop; /* inode slab cache */ |
b0196009d [PATCH] cpuset me... |
1626 1627 1628 1629 1630 |
inode_cachep = kmem_cache_create("inode_cache", sizeof(struct inode), 0, (SLAB_RECLAIM_ACCOUNT|SLAB_PANIC| SLAB_MEM_SPREAD), |
20c2df83d mm: Remove slab d... |
1631 |
init_once); |
1da177e4c Linux-2.6.12-rc2 |
1632 1633 1634 1635 1636 1637 1638 1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 1649 1650 1651 1652 1653 1654 1655 1656 1657 1658 1659 1660 1661 1662 1663 1664 |
/* 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... |
1665 1666 1667 1668 |
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 |
1669 1670 |
} EXPORT_SYMBOL(init_special_inode); |
a1bd120d1 vfs: Add inode ui... |
1671 1672 |
/** |
eaae668d0 fs/inode: Fix ker... |
1673 |
* inode_init_owner - Init uid,gid,mode for new inode according to posix standards |
a1bd120d1 vfs: Add inode ui... |
1674 1675 1676 1677 1678 |
* @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... |
1679 |
umode_t mode) |
a1bd120d1 vfs: Add inode ui... |
1680 1681 1682 1683 1684 1685 1686 1687 1688 1689 1690 |
{ 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... |
1691 |
|
2e1496707 userns: rename is... |
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/** * 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. |
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*/ |
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bool inode_owner_or_capable(const struct inode *inode) |
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{ 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; } |
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EXPORT_SYMBOL(inode_owner_or_capable); |