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fs/inode.c
55 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 <trace/events/writeback.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->i_sb->s_inode_list_lock protects: * inode->i_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,dirty_time}, inode->i_io_list |
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* inode_hash_lock protects: * inode_hashtable, inode->i_hash |
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* * Lock ordering: |
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* |
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* inode->i_sb->s_inode_list_lock |
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* 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 |
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* inode->i_sb->s_inode_list_lock |
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* 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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/* |
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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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if (sb->s_xattr) inode->i_opflags |= IOP_XATTR; |
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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; |
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inode->i_link = NULL; |
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inode->i_dir_seq = 0; |
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inode->i_rdev = 0; inode->dirtied_when = 0; |
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|
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#ifdef CONFIG_CGROUP_WRITEBACK inode->i_wb_frn_winner = 0; inode->i_wb_frn_avg_time = 0; inode->i_wb_frn_history = 0; #endif |
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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); |
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init_rwsem(&inode->i_rwsem); lockdep_set_class(&inode->i_rwsem, &sb->s_type->i_mutex_key); |
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|
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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->writeback_index = 0; |
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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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inode->i_flctx = NULL; |
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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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inode_detach_wb(inode); |
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security_inode_free(inode); |
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fsnotify_inode_delete(inode); |
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locks_free_lock_context(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 |
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if (inode->i_acl && !is_uncached_acl(inode->i_acl)) |
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posix_acl_release(inode->i_acl); |
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if (inode->i_default_acl && !is_uncached_acl(inode->i_default_acl)) |
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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)); |
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INIT_RADIX_TREE(&mapping->page_tree, GFP_ATOMIC | __GFP_ACCOUNT); |
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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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} 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_io_list); |
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INIT_LIST_HEAD(&inode->i_wb_list); |
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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) { |
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if (!(inode->i_state & (I_DIRTY_ALL | I_SYNC | I_FREEING | I_WILL_FREE)) && |
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!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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409 |
this_cpu_dec(nr_unused); |
1da177e4c Linux-2.6.12-rc2 |
410 |
} |
646ec4615 fs: remove inode_... |
411 412 413 414 415 416 |
/** * inode_sb_list_add - add inode to the superblock list of inodes * @inode: inode to add */ void inode_sb_list_add(struct inode *inode) { |
74278da9f inode: convert in... |
417 |
spin_lock(&inode->i_sb->s_inode_list_lock); |
55fa6091d fs: move i_sb_lis... |
418 |
list_add(&inode->i_sb_list, &inode->i_sb->s_inodes); |
74278da9f inode: convert in... |
419 |
spin_unlock(&inode->i_sb->s_inode_list_lock); |
646ec4615 fs: remove inode_... |
420 421 |
} EXPORT_SYMBOL_GPL(inode_sb_list_add); |
55fa6091d fs: move i_sb_lis... |
422 |
static inline void inode_sb_list_del(struct inode *inode) |
646ec4615 fs: remove inode_... |
423 |
{ |
a209dfc7b vfs: dont chain p... |
424 |
if (!list_empty(&inode->i_sb_list)) { |
74278da9f inode: convert in... |
425 |
spin_lock(&inode->i_sb->s_inode_list_lock); |
a209dfc7b vfs: dont chain p... |
426 |
list_del_init(&inode->i_sb_list); |
74278da9f inode: convert in... |
427 |
spin_unlock(&inode->i_sb->s_inode_list_lock); |
a209dfc7b vfs: dont chain p... |
428 |
} |
646ec4615 fs: remove inode_... |
429 |
} |
4c51acbc6 fs: Factor inode ... |
430 431 432 433 434 435 |
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... |
436 437 |
tmp = tmp ^ ((tmp ^ GOLDEN_RATIO_PRIME) >> i_hash_shift); return tmp & i_hash_mask; |
4c51acbc6 fs: Factor inode ... |
438 439 440 441 442 443 444 445 446 447 448 449 |
} /** * __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_... |
450 |
struct hlist_head *b = inode_hashtable + hash(inode->i_sb, hashval); |
67a23c494 fs: rename inode_... |
451 |
spin_lock(&inode_hash_lock); |
250df6ed2 fs: protect inode... |
452 |
spin_lock(&inode->i_lock); |
646ec4615 fs: remove inode_... |
453 |
hlist_add_head(&inode->i_hash, b); |
250df6ed2 fs: protect inode... |
454 |
spin_unlock(&inode->i_lock); |
67a23c494 fs: rename inode_... |
455 |
spin_unlock(&inode_hash_lock); |
4c51acbc6 fs: Factor inode ... |
456 457 458 459 |
} EXPORT_SYMBOL(__insert_inode_hash); /** |
f2ee7abf4 vfs: avoid taking... |
460 |
* __remove_inode_hash - remove an inode from the hash |
4c51acbc6 fs: Factor inode ... |
461 462 463 464 |
* @inode: inode to unhash * * Remove an inode from the superblock. */ |
f2ee7abf4 vfs: avoid taking... |
465 |
void __remove_inode_hash(struct inode *inode) |
4c51acbc6 fs: Factor inode ... |
466 |
{ |
67a23c494 fs: rename inode_... |
467 |
spin_lock(&inode_hash_lock); |
250df6ed2 fs: protect inode... |
468 |
spin_lock(&inode->i_lock); |
4c51acbc6 fs: Factor inode ... |
469 |
hlist_del_init(&inode->i_hash); |
250df6ed2 fs: protect inode... |
470 |
spin_unlock(&inode->i_lock); |
67a23c494 fs: rename inode_... |
471 |
spin_unlock(&inode_hash_lock); |
4c51acbc6 fs: Factor inode ... |
472 |
} |
f2ee7abf4 vfs: avoid taking... |
473 |
EXPORT_SYMBOL(__remove_inode_hash); |
4c51acbc6 fs: Factor inode ... |
474 |
|
dbd5768f8 vfs: Rename end_w... |
475 |
void clear_inode(struct inode *inode) |
b0683aa63 new helper: end_w... |
476 477 |
{ might_sleep(); |
08142579b mm: fix assertion... |
478 479 480 481 482 483 |
/* * 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... |
484 |
BUG_ON(inode->i_data.nrpages); |
f9fe48bec dax: support dirt... |
485 |
BUG_ON(inode->i_data.nrexceptional); |
08142579b mm: fix assertion... |
486 |
spin_unlock_irq(&inode->i_data.tree_lock); |
b0683aa63 new helper: end_w... |
487 488 489 |
BUG_ON(!list_empty(&inode->i_data.private_list)); BUG_ON(!(inode->i_state & I_FREEING)); BUG_ON(inode->i_state & I_CLEAR); |
6c60d2b57 fs/fs-writeback.c... |
490 |
BUG_ON(!list_empty(&inode->i_wb_list)); |
fa0d7e3de fs: icache RCU fr... |
491 |
/* don't need i_lock here, no concurrent mods to i_state */ |
b0683aa63 new helper: end_w... |
492 493 |
inode->i_state = I_FREEING | I_CLEAR; } |
dbd5768f8 vfs: Rename end_w... |
494 |
EXPORT_SYMBOL(clear_inode); |
b0683aa63 new helper: end_w... |
495 |
|
b2b2af8e6 fs: factor inode ... |
496 497 498 499 500 501 502 503 504 505 506 507 508 |
/* * 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(... |
509 |
static void evict(struct inode *inode) |
b4272d4c8 unify fs/inode.c ... |
510 511 |
{ const struct super_operations *op = inode->i_sb->s_op; |
b2b2af8e6 fs: factor inode ... |
512 513 |
BUG_ON(!(inode->i_state & I_FREEING)); BUG_ON(!list_empty(&inode->i_lru)); |
c7f540849 inode: rename i_w... |
514 515 |
if (!list_empty(&inode->i_io_list)) inode_io_list_del(inode); |
b12362bdb vfs: conditionall... |
516 |
|
55fa6091d fs: move i_sb_lis... |
517 |
inode_sb_list_del(inode); |
169ebd901 writeback: Avoid ... |
518 519 520 521 522 523 524 |
/* * 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... |
525 |
|
be7ce4161 New method - evic... |
526 527 |
if (op->evict_inode) { op->evict_inode(inode); |
b4272d4c8 unify fs/inode.c ... |
528 |
} else { |
91b0abe36 mm + fs: store sh... |
529 |
truncate_inode_pages_final(&inode->i_data); |
dbd5768f8 vfs: Rename end_w... |
530 |
clear_inode(inode); |
b4272d4c8 unify fs/inode.c ... |
531 |
} |
661074e91 Take ->i_bdev/->i... |
532 533 534 535 |
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 ... |
536 537 538 539 540 541 542 543 544 |
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 ... |
545 |
} |
1da177e4c Linux-2.6.12-rc2 |
546 547 548 549 550 551 552 553 554 |
/* * 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 |
555 556 |
while (!list_empty(head)) { struct inode *inode; |
7ccf19a80 fs: inode split I... |
557 558 |
inode = list_first_entry(head, struct inode, i_lru); list_del_init(&inode->i_lru); |
1da177e4c Linux-2.6.12-rc2 |
559 |
|
644da5960 fs/inode.c:evict(... |
560 |
evict(inode); |
ac05fbb40 inode: don't soft... |
561 |
cond_resched(); |
1da177e4c Linux-2.6.12-rc2 |
562 |
} |
1da177e4c Linux-2.6.12-rc2 |
563 |
} |
a03187867 fs: fold invalida... |
564 |
/** |
63997e98a split invalidate_... |
565 566 567 568 569 570 571 |
* 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 |
572 |
*/ |
63997e98a split invalidate_... |
573 |
void evict_inodes(struct super_block *sb) |
1da177e4c Linux-2.6.12-rc2 |
574 |
{ |
63997e98a split invalidate_... |
575 576 |
struct inode *inode, *next; LIST_HEAD(dispose); |
1da177e4c Linux-2.6.12-rc2 |
577 |
|
ac05fbb40 inode: don't soft... |
578 |
again: |
74278da9f inode: convert in... |
579 |
spin_lock(&sb->s_inode_list_lock); |
63997e98a split invalidate_... |
580 581 |
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... |
582 |
continue; |
250df6ed2 fs: protect inode... |
583 584 585 586 |
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 |
587 |
continue; |
250df6ed2 fs: protect inode... |
588 |
} |
63997e98a split invalidate_... |
589 590 |
inode->i_state |= I_FREEING; |
02afc410f fs: Lock the inod... |
591 |
inode_lru_list_del(inode); |
250df6ed2 fs: protect inode... |
592 |
spin_unlock(&inode->i_lock); |
02afc410f fs: Lock the inod... |
593 |
list_add(&inode->i_lru, &dispose); |
ac05fbb40 inode: don't soft... |
594 595 596 597 598 599 600 601 602 603 604 605 |
/* * We can have a ton of inodes to evict at unmount time given * enough memory, check to see if we need to go to sleep for a * bit so we don't livelock. */ if (need_resched()) { spin_unlock(&sb->s_inode_list_lock); cond_resched(); dispose_list(&dispose); goto again; } |
1da177e4c Linux-2.6.12-rc2 |
606 |
} |
74278da9f inode: convert in... |
607 |
spin_unlock(&sb->s_inode_list_lock); |
63997e98a split invalidate_... |
608 609 |
dispose_list(&dispose); |
1da177e4c Linux-2.6.12-rc2 |
610 |
} |
1da177e4c Linux-2.6.12-rc2 |
611 |
/** |
a03187867 fs: fold invalida... |
612 613 |
* invalidate_inodes - attempt to free all inodes on a superblock * @sb: superblock to operate on |
93b270f76 Fix over-zealous ... |
614 |
* @kill_dirty: flag to guide handling of dirty inodes |
1da177e4c Linux-2.6.12-rc2 |
615 |
* |
a03187867 fs: fold invalida... |
616 617 |
* 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 ... |
618 619 |
* If @kill_dirty is set, discard dirty inodes too, otherwise treat * them as busy. |
1da177e4c Linux-2.6.12-rc2 |
620 |
*/ |
93b270f76 Fix over-zealous ... |
621 |
int invalidate_inodes(struct super_block *sb, bool kill_dirty) |
1da177e4c Linux-2.6.12-rc2 |
622 |
{ |
cffbc8aa3 fs: Convert nr_in... |
623 |
int busy = 0; |
a03187867 fs: fold invalida... |
624 625 |
struct inode *inode, *next; LIST_HEAD(dispose); |
1da177e4c Linux-2.6.12-rc2 |
626 |
|
74278da9f inode: convert in... |
627 |
spin_lock(&sb->s_inode_list_lock); |
a03187867 fs: fold invalida... |
628 |
list_for_each_entry_safe(inode, next, &sb->s_inodes, i_sb_list) { |
250df6ed2 fs: protect inode... |
629 630 631 |
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... |
632 |
continue; |
250df6ed2 fs: protect inode... |
633 |
} |
0ae45f63d vfs: add support ... |
634 |
if (inode->i_state & I_DIRTY_ALL && !kill_dirty) { |
250df6ed2 fs: protect inode... |
635 |
spin_unlock(&inode->i_lock); |
93b270f76 Fix over-zealous ... |
636 637 638 |
busy = 1; continue; } |
99a389192 fs: fix buffer in... |
639 |
if (atomic_read(&inode->i_count)) { |
250df6ed2 fs: protect inode... |
640 |
spin_unlock(&inode->i_lock); |
99a389192 fs: fix buffer in... |
641 |
busy = 1; |
1da177e4c Linux-2.6.12-rc2 |
642 643 |
continue; } |
99a389192 fs: fix buffer in... |
644 |
|
99a389192 fs: fix buffer in... |
645 |
inode->i_state |= I_FREEING; |
02afc410f fs: Lock the inod... |
646 |
inode_lru_list_del(inode); |
250df6ed2 fs: protect inode... |
647 |
spin_unlock(&inode->i_lock); |
02afc410f fs: Lock the inod... |
648 |
list_add(&inode->i_lru, &dispose); |
1da177e4c Linux-2.6.12-rc2 |
649 |
} |
74278da9f inode: convert in... |
650 |
spin_unlock(&sb->s_inode_list_lock); |
1da177e4c Linux-2.6.12-rc2 |
651 |
|
a03187867 fs: fold invalida... |
652 |
dispose_list(&dispose); |
1da177e4c Linux-2.6.12-rc2 |
653 654 655 |
return busy; } |
1da177e4c Linux-2.6.12-rc2 |
656 |
|
1da177e4c Linux-2.6.12-rc2 |
657 |
/* |
bc3b14cb2 inode: convert in... |
658 |
* Isolate the inode from the LRU in preparation for freeing it. |
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 |
*/ |
3f97b1632 list_lru: add hel... |
672 673 |
static enum lru_status inode_lru_isolate(struct list_head *item, struct list_lru_one *lru, spinlock_t *lru_lock, void *arg) |
1da177e4c Linux-2.6.12-rc2 |
674 |
{ |
bc3b14cb2 inode: convert in... |
675 676 |
struct list_head *freeable = arg; struct inode *inode = container_of(item, struct inode, i_lru); |
1da177e4c Linux-2.6.12-rc2 |
677 |
|
bc3b14cb2 inode: convert in... |
678 679 680 681 682 683 |
/* * 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 |
684 |
|
bc3b14cb2 inode: convert in... |
685 686 687 688 689 690 |
/* * 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)) { |
3f97b1632 list_lru: add hel... |
691 |
list_lru_isolate(lru, &inode->i_lru); |
bc3b14cb2 inode: convert in... |
692 693 694 695 |
spin_unlock(&inode->i_lock); this_cpu_dec(nr_unused); return LRU_REMOVED; } |
1da177e4c Linux-2.6.12-rc2 |
696 |
|
bc3b14cb2 inode: convert in... |
697 698 699 700 701 702 |
/* 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 |
703 |
|
bc3b14cb2 inode: convert in... |
704 705 706 707 708 709 710 711 712 713 714 715 716 |
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... |
717 |
} |
bc3b14cb2 inode: convert in... |
718 719 720 721 |
iput(inode); spin_lock(lru_lock); return LRU_RETRY; } |
02afc410f fs: Lock the inod... |
722 |
|
bc3b14cb2 inode: convert in... |
723 724 |
WARN_ON(inode->i_state & I_NEW); inode->i_state |= I_FREEING; |
3f97b1632 list_lru: add hel... |
725 |
list_lru_isolate_move(lru, &inode->i_lru, freeable); |
bc3b14cb2 inode: convert in... |
726 |
spin_unlock(&inode->i_lock); |
9e38d86ff fs: Implement laz... |
727 |
|
bc3b14cb2 inode: convert in... |
728 729 730 |
this_cpu_dec(nr_unused); return LRU_REMOVED; } |
7ccf19a80 fs: inode split I... |
731 |
|
bc3b14cb2 inode: convert in... |
732 733 734 735 736 737 |
/* * 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(). */ |
503c358cf list_lru: introdu... |
738 |
long prune_icache_sb(struct super_block *sb, struct shrink_control *sc) |
bc3b14cb2 inode: convert in... |
739 740 741 |
{ LIST_HEAD(freeable); long freed; |
1da177e4c Linux-2.6.12-rc2 |
742 |
|
503c358cf list_lru: introdu... |
743 744 |
freed = list_lru_shrink_walk(&sb->s_inode_lru, sc, inode_lru_isolate, &freeable); |
1da177e4c Linux-2.6.12-rc2 |
745 |
dispose_list(&freeable); |
0a234c6dc shrinker: convert... |
746 |
return freed; |
1da177e4c Linux-2.6.12-rc2 |
747 |
} |
1da177e4c Linux-2.6.12-rc2 |
748 749 750 |
static void __wait_on_freeing_inode(struct inode *inode); /* * Called with the inode lock held. |
1da177e4c Linux-2.6.12-rc2 |
751 |
*/ |
6b3304b53 Make checkpatch.p... |
752 753 754 755 |
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 |
756 |
{ |
6b3304b53 Make checkpatch.p... |
757 |
struct inode *inode = NULL; |
1da177e4c Linux-2.6.12-rc2 |
758 759 |
repeat: |
b67bfe0d4 hlist: drop the n... |
760 |
hlist_for_each_entry(inode, head, i_hash) { |
5a3cd9928 iget/iget5: don't... |
761 |
if (inode->i_sb != sb) |
1da177e4c Linux-2.6.12-rc2 |
762 |
continue; |
5a3cd9928 iget/iget5: don't... |
763 |
if (!test(inode, data)) |
1da177e4c Linux-2.6.12-rc2 |
764 |
continue; |
5a3cd9928 iget/iget5: don't... |
765 |
spin_lock(&inode->i_lock); |
a4ffdde6e simplify checks f... |
766 |
if (inode->i_state & (I_FREEING|I_WILL_FREE)) { |
1da177e4c Linux-2.6.12-rc2 |
767 768 769 |
__wait_on_freeing_inode(inode); goto repeat; } |
f7899bd54 fs: move i_count ... |
770 |
__iget(inode); |
250df6ed2 fs: protect inode... |
771 |
spin_unlock(&inode->i_lock); |
f7899bd54 fs: move i_count ... |
772 |
return inode; |
1da177e4c Linux-2.6.12-rc2 |
773 |
} |
f7899bd54 fs: move i_count ... |
774 |
return NULL; |
1da177e4c Linux-2.6.12-rc2 |
775 776 777 778 779 780 |
} /* * find_inode_fast is the fast path version of find_inode, see the comment at * iget_locked for details. */ |
6b3304b53 Make checkpatch.p... |
781 782 |
static struct inode *find_inode_fast(struct super_block *sb, struct hlist_head *head, unsigned long ino) |
1da177e4c Linux-2.6.12-rc2 |
783 |
{ |
6b3304b53 Make checkpatch.p... |
784 |
struct inode *inode = NULL; |
1da177e4c Linux-2.6.12-rc2 |
785 786 |
repeat: |
b67bfe0d4 hlist: drop the n... |
787 |
hlist_for_each_entry(inode, head, i_hash) { |
5a3cd9928 iget/iget5: don't... |
788 |
if (inode->i_ino != ino) |
1da177e4c Linux-2.6.12-rc2 |
789 |
continue; |
5a3cd9928 iget/iget5: don't... |
790 |
if (inode->i_sb != sb) |
1da177e4c Linux-2.6.12-rc2 |
791 |
continue; |
5a3cd9928 iget/iget5: don't... |
792 |
spin_lock(&inode->i_lock); |
a4ffdde6e simplify checks f... |
793 |
if (inode->i_state & (I_FREEING|I_WILL_FREE)) { |
1da177e4c Linux-2.6.12-rc2 |
794 795 796 |
__wait_on_freeing_inode(inode); goto repeat; } |
f7899bd54 fs: move i_count ... |
797 |
__iget(inode); |
250df6ed2 fs: protect inode... |
798 |
spin_unlock(&inode->i_lock); |
f7899bd54 fs: move i_count ... |
799 |
return inode; |
1da177e4c Linux-2.6.12-rc2 |
800 |
} |
f7899bd54 fs: move i_count ... |
801 |
return NULL; |
8290c35f8 Inode: Allow exte... |
802 |
} |
f991bd2e1 fs: introduce a p... |
803 804 805 806 |
/* * 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... |
807 |
* |
f991bd2e1 fs: introduce a p... |
808 809 810 811 812 813 814 815 816 |
* 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... |
817 |
*/ |
f991bd2e1 fs: introduce a p... |
818 819 |
#define LAST_INO_BATCH 1024 static DEFINE_PER_CPU(unsigned int, last_ino); |
85fe4025c fs: do not assign... |
820 |
unsigned int get_next_ino(void) |
8290c35f8 Inode: Allow exte... |
821 |
{ |
f991bd2e1 fs: introduce a p... |
822 823 |
unsigned int *p = &get_cpu_var(last_ino); unsigned int res = *p; |
8290c35f8 Inode: Allow exte... |
824 |
|
f991bd2e1 fs: introduce a p... |
825 826 827 828 829 830 831 832 |
#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 |
2adc376c5 vfs: avoid creati... |
833 834 835 836 837 |
res++; /* get_next_ino should not provide a 0 inode number */ if (unlikely(!res)) res++; *p = res; |
f991bd2e1 fs: introduce a p... |
838 839 |
put_cpu_var(last_ino); return res; |
8290c35f8 Inode: Allow exte... |
840 |
} |
85fe4025c fs: do not assign... |
841 |
EXPORT_SYMBOL(get_next_ino); |
8290c35f8 Inode: Allow exte... |
842 |
|
1da177e4c Linux-2.6.12-rc2 |
843 |
/** |
a209dfc7b vfs: dont chain p... |
844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 |
* 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 |
867 868 869 |
* new_inode - obtain an inode * @sb: superblock * |
769848c03 Add __GFP_MOVABLE... |
870 |
* Allocates a new inode for given superblock. The default gfp_mask |
3c1d43787 mm: remove GFP_HI... |
871 |
* for allocations related to inode->i_mapping is GFP_HIGHUSER_MOVABLE. |
769848c03 Add __GFP_MOVABLE... |
872 873 874 875 876 |
* 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 |
877 878 879 |
*/ struct inode *new_inode(struct super_block *sb) { |
6b3304b53 Make checkpatch.p... |
880 |
struct inode *inode; |
1da177e4c Linux-2.6.12-rc2 |
881 |
|
74278da9f inode: convert in... |
882 |
spin_lock_prefetch(&sb->s_inode_list_lock); |
6b3304b53 Make checkpatch.p... |
883 |
|
a209dfc7b vfs: dont chain p... |
884 885 |
inode = new_inode_pseudo(sb); if (inode) |
55fa6091d fs: move i_sb_lis... |
886 |
inode_sb_list_add(inode); |
1da177e4c Linux-2.6.12-rc2 |
887 888 |
return inode; } |
1da177e4c Linux-2.6.12-rc2 |
889 |
EXPORT_SYMBOL(new_inode); |
14358e6dd lockdep: annotate... |
890 |
#ifdef CONFIG_DEBUG_LOCK_ALLOC |
e096d0c7e lockdep: Add help... |
891 892 |
void lockdep_annotate_inode_mutex_key(struct inode *inode) { |
a3314a0ed lockdep: fixup ch... |
893 |
if (S_ISDIR(inode->i_mode)) { |
1e89a5e15 lockdep: fixup th... |
894 |
struct file_system_type *type = inode->i_sb->s_type; |
9a7aa12f3 vfs: Set special ... |
895 |
/* Set new key only if filesystem hasn't already changed it */ |
9902af79c parallel lookups:... |
896 |
if (lockdep_match_class(&inode->i_rwsem, &type->i_mutex_key)) { |
9a7aa12f3 vfs: Set special ... |
897 898 899 |
/* * ensure nobody is actually holding i_mutex */ |
9902af79c parallel lookups:... |
900 901 902 |
// mutex_destroy(&inode->i_mutex); init_rwsem(&inode->i_rwsem); lockdep_set_class(&inode->i_rwsem, |
9a7aa12f3 vfs: Set special ... |
903 904 |
&type->i_mutex_dir_key); } |
1e89a5e15 lockdep: fixup th... |
905 |
} |
e096d0c7e lockdep: Add help... |
906 907 |
} EXPORT_SYMBOL(lockdep_annotate_inode_mutex_key); |
14358e6dd lockdep: annotate... |
908 |
#endif |
e096d0c7e lockdep: Add help... |
909 910 911 912 913 914 915 916 917 918 919 |
/** * 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... |
920 |
spin_lock(&inode->i_lock); |
eaff8079d kill I_LOCK |
921 922 |
WARN_ON(!(inode->i_state & I_NEW)); inode->i_state &= ~I_NEW; |
310fa7a36 restore smp_mb() ... |
923 |
smp_mb(); |
250df6ed2 fs: protect inode... |
924 925 |
wake_up_bit(&inode->i_state, __I_NEW); spin_unlock(&inode->i_lock); |
1da177e4c Linux-2.6.12-rc2 |
926 |
} |
1da177e4c Linux-2.6.12-rc2 |
927 |
EXPORT_SYMBOL(unlock_new_inode); |
0b2d0724e fs: simplify iget... |
928 |
/** |
375e289ea vfs: pull ext4's ... |
929 |
* lock_two_nondirectories - take two i_mutexes on non-directory objects |
4fd699ae3 vfs: lock_two_non... |
930 931 932 933 |
* * 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 ... |
934 935 936 937 938 |
* @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... |
939 940 941 942 |
if (inode1 > inode2) swap(inode1, inode2); if (inode1 && !S_ISDIR(inode1->i_mode)) |
5955102c9 wrappers for ->i_... |
943 |
inode_lock(inode1); |
4fd699ae3 vfs: lock_two_non... |
944 |
if (inode2 && !S_ISDIR(inode2->i_mode) && inode2 != inode1) |
5955102c9 wrappers for ->i_... |
945 |
inode_lock_nested(inode2, I_MUTEX_NONDIR2); |
375e289ea vfs: pull ext4's ... |
946 947 948 949 950 951 952 953 954 955 |
} 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... |
956 |
if (inode1 && !S_ISDIR(inode1->i_mode)) |
5955102c9 wrappers for ->i_... |
957 |
inode_unlock(inode1); |
4fd699ae3 vfs: lock_two_non... |
958 |
if (inode2 && !S_ISDIR(inode2->i_mode) && inode2 != inode1) |
5955102c9 wrappers for ->i_... |
959 |
inode_unlock(inode2); |
375e289ea vfs: pull ext4's ... |
960 961 962 963 |
} EXPORT_SYMBOL(unlock_two_nondirectories); /** |
0b2d0724e fs: simplify iget... |
964 965 966 967 968 969 970 971 972 973 974 975 976 977 978 |
* 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 |
979 |
* |
0b2d0724e fs: simplify iget... |
980 981 |
* Note both @test and @set are called with the inode_hash_lock held, so can't * sleep. |
1da177e4c Linux-2.6.12-rc2 |
982 |
*/ |
0b2d0724e fs: simplify iget... |
983 984 985 |
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 |
986 |
{ |
0b2d0724e fs: simplify iget... |
987 |
struct hlist_head *head = inode_hashtable + hash(sb, hashval); |
6b3304b53 Make checkpatch.p... |
988 |
struct inode *inode; |
2864f3014 iget_locked et.al... |
989 |
again: |
0b2d0724e fs: simplify iget... |
990 991 992 993 994 995 |
spin_lock(&inode_hash_lock); inode = find_inode(sb, head, test, data); spin_unlock(&inode_hash_lock); if (inode) { wait_on_inode(inode); |
2864f3014 iget_locked et.al... |
996 997 998 999 |
if (unlikely(inode_unhashed(inode))) { iput(inode); goto again; } |
0b2d0724e fs: simplify iget... |
1000 1001 |
return inode; } |
1da177e4c Linux-2.6.12-rc2 |
1002 1003 |
inode = alloc_inode(sb); if (inode) { |
6b3304b53 Make checkpatch.p... |
1004 |
struct inode *old; |
1da177e4c Linux-2.6.12-rc2 |
1005 |
|
67a23c494 fs: rename inode_... |
1006 |
spin_lock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
1007 1008 1009 1010 1011 |
/* 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... |
1012 1013 |
spin_lock(&inode->i_lock); inode->i_state = I_NEW; |
646ec4615 fs: remove inode_... |
1014 |
hlist_add_head(&inode->i_hash, head); |
250df6ed2 fs: protect inode... |
1015 |
spin_unlock(&inode->i_lock); |
55fa6091d fs: move i_sb_lis... |
1016 |
inode_sb_list_add(inode); |
67a23c494 fs: rename inode_... |
1017 |
spin_unlock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 |
/* 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_... |
1030 |
spin_unlock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
1031 1032 1033 |
destroy_inode(inode); inode = old; wait_on_inode(inode); |
2864f3014 iget_locked et.al... |
1034 1035 1036 1037 |
if (unlikely(inode_unhashed(inode))) { iput(inode); goto again; } |
1da177e4c Linux-2.6.12-rc2 |
1038 1039 1040 1041 |
} return inode; set_failed: |
67a23c494 fs: rename inode_... |
1042 |
spin_unlock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
1043 1044 1045 |
destroy_inode(inode); return NULL; } |
0b2d0724e fs: simplify iget... |
1046 |
EXPORT_SYMBOL(iget5_locked); |
1da177e4c Linux-2.6.12-rc2 |
1047 |
|
0b2d0724e fs: simplify iget... |
1048 1049 1050 1051 1052 1053 1054 1055 1056 1057 1058 1059 |
/** * 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 |
1060 |
*/ |
0b2d0724e fs: simplify iget... |
1061 |
struct inode *iget_locked(struct super_block *sb, unsigned long ino) |
1da177e4c Linux-2.6.12-rc2 |
1062 |
{ |
0b2d0724e fs: simplify iget... |
1063 |
struct hlist_head *head = inode_hashtable + hash(sb, ino); |
6b3304b53 Make checkpatch.p... |
1064 |
struct inode *inode; |
2864f3014 iget_locked et.al... |
1065 |
again: |
0b2d0724e fs: simplify iget... |
1066 1067 1068 1069 1070 |
spin_lock(&inode_hash_lock); inode = find_inode_fast(sb, head, ino); spin_unlock(&inode_hash_lock); if (inode) { wait_on_inode(inode); |
2864f3014 iget_locked et.al... |
1071 1072 1073 1074 |
if (unlikely(inode_unhashed(inode))) { iput(inode); goto again; } |
0b2d0724e fs: simplify iget... |
1075 1076 |
return inode; } |
1da177e4c Linux-2.6.12-rc2 |
1077 1078 |
inode = alloc_inode(sb); if (inode) { |
6b3304b53 Make checkpatch.p... |
1079 |
struct inode *old; |
1da177e4c Linux-2.6.12-rc2 |
1080 |
|
67a23c494 fs: rename inode_... |
1081 |
spin_lock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
1082 1083 1084 1085 |
/* We released the lock, so.. */ old = find_inode_fast(sb, head, ino); if (!old) { inode->i_ino = ino; |
250df6ed2 fs: protect inode... |
1086 1087 |
spin_lock(&inode->i_lock); inode->i_state = I_NEW; |
646ec4615 fs: remove inode_... |
1088 |
hlist_add_head(&inode->i_hash, head); |
250df6ed2 fs: protect inode... |
1089 |
spin_unlock(&inode->i_lock); |
55fa6091d fs: move i_sb_lis... |
1090 |
inode_sb_list_add(inode); |
67a23c494 fs: rename inode_... |
1091 |
spin_unlock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
1092 1093 1094 1095 1096 1097 1098 1099 1100 1101 1102 1103 |
/* 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_... |
1104 |
spin_unlock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
1105 1106 1107 |
destroy_inode(inode); inode = old; wait_on_inode(inode); |
2864f3014 iget_locked et.al... |
1108 1109 1110 1111 |
if (unlikely(inode_unhashed(inode))) { iput(inode); goto again; } |
1da177e4c Linux-2.6.12-rc2 |
1112 1113 1114 |
} return inode; } |
0b2d0724e fs: simplify iget... |
1115 |
EXPORT_SYMBOL(iget_locked); |
1da177e4c Linux-2.6.12-rc2 |
1116 |
|
ad5e195ac fs: Stop abusing ... |
1117 1118 1119 1120 1121 1122 1123 1124 1125 1126 |
/* * 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 ... |
1127 |
struct inode *inode; |
67a23c494 fs: rename inode_... |
1128 |
spin_lock(&inode_hash_lock); |
b67bfe0d4 hlist: drop the n... |
1129 |
hlist_for_each_entry(inode, b, i_hash) { |
67a23c494 fs: rename inode_... |
1130 1131 |
if (inode->i_ino == ino && inode->i_sb == sb) { spin_unlock(&inode_hash_lock); |
ad5e195ac fs: Stop abusing ... |
1132 |
return 0; |
67a23c494 fs: rename inode_... |
1133 |
} |
ad5e195ac fs: Stop abusing ... |
1134 |
} |
67a23c494 fs: rename inode_... |
1135 |
spin_unlock(&inode_hash_lock); |
ad5e195ac fs: Stop abusing ... |
1136 1137 1138 |
return 1; } |
1da177e4c Linux-2.6.12-rc2 |
1139 1140 1141 1142 1143 1144 1145 1146 1147 1148 1149 1150 1151 1152 1153 1154 |
/** * 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: ... |
1155 1156 1157 1158 1159 |
/* * 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 ... |
1160 |
static DEFINE_SPINLOCK(iunique_lock); |
866b04fcc inode numbering: ... |
1161 |
static unsigned int counter; |
1da177e4c Linux-2.6.12-rc2 |
1162 |
ino_t res; |
3361c7beb make iunique use ... |
1163 |
|
ad5e195ac fs: Stop abusing ... |
1164 |
spin_lock(&iunique_lock); |
3361c7beb make iunique use ... |
1165 1166 1167 |
do { if (counter <= max_reserved) counter = max_reserved + 1; |
1da177e4c Linux-2.6.12-rc2 |
1168 |
res = counter++; |
ad5e195ac fs: Stop abusing ... |
1169 1170 |
} while (!test_inode_iunique(sb, res)); spin_unlock(&iunique_lock); |
1da177e4c Linux-2.6.12-rc2 |
1171 |
|
3361c7beb make iunique use ... |
1172 1173 |
return res; } |
1da177e4c Linux-2.6.12-rc2 |
1174 1175 1176 1177 |
EXPORT_SYMBOL(iunique); struct inode *igrab(struct inode *inode) { |
250df6ed2 fs: protect inode... |
1178 1179 |
spin_lock(&inode->i_lock); if (!(inode->i_state & (I_FREEING|I_WILL_FREE))) { |
1da177e4c Linux-2.6.12-rc2 |
1180 |
__iget(inode); |
250df6ed2 fs: protect inode... |
1181 1182 1183 |
spin_unlock(&inode->i_lock); } else { spin_unlock(&inode->i_lock); |
1da177e4c Linux-2.6.12-rc2 |
1184 1185 1186 1187 1188 1189 |
/* * 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... |
1190 |
} |
1da177e4c Linux-2.6.12-rc2 |
1191 1192 |
return inode; } |
1da177e4c Linux-2.6.12-rc2 |
1193 1194 1195 |
EXPORT_SYMBOL(igrab); /** |
0b2d0724e fs: simplify iget... |
1196 |
* ilookup5_nowait - search for an inode in the inode cache |
1da177e4c Linux-2.6.12-rc2 |
1197 |
* @sb: super block of file system to search |
0b2d0724e fs: simplify iget... |
1198 |
* @hashval: hash value (usually inode number) to search for |
1da177e4c Linux-2.6.12-rc2 |
1199 1200 |
* @test: callback used for comparisons between inodes * @data: opaque data pointer to pass to @test |
1da177e4c Linux-2.6.12-rc2 |
1201 |
* |
0b2d0724e fs: simplify iget... |
1202 |
* Search for the inode specified by @hashval and @data in the inode cache. |
1da177e4c Linux-2.6.12-rc2 |
1203 1204 1205 |
* If the inode is in the cache, the inode is returned with an incremented * reference count. * |
0b2d0724e fs: simplify iget... |
1206 1207 |
* 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 |
1208 |
* |
b6d0ad686 fs: fix inode.c k... |
1209 |
* Note2: @test is called with the inode_hash_lock held, so can't sleep. |
1da177e4c Linux-2.6.12-rc2 |
1210 |
*/ |
0b2d0724e fs: simplify iget... |
1211 1212 |
struct inode *ilookup5_nowait(struct super_block *sb, unsigned long hashval, int (*test)(struct inode *, void *), void *data) |
1da177e4c Linux-2.6.12-rc2 |
1213 |
{ |
0b2d0724e fs: simplify iget... |
1214 |
struct hlist_head *head = inode_hashtable + hash(sb, hashval); |
1da177e4c Linux-2.6.12-rc2 |
1215 |
struct inode *inode; |
67a23c494 fs: rename inode_... |
1216 |
spin_lock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
1217 |
inode = find_inode(sb, head, test, data); |
67a23c494 fs: rename inode_... |
1218 |
spin_unlock(&inode_hash_lock); |
88bd5121d [PATCH] Fix soft ... |
1219 |
|
0b2d0724e fs: simplify iget... |
1220 |
return inode; |
88bd5121d [PATCH] Fix soft ... |
1221 |
} |
88bd5121d [PATCH] Fix soft ... |
1222 1223 1224 1225 1226 1227 1228 1229 1230 |
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... |
1231 1232 1233 |
* 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 ... |
1234 |
* returned with an incremented reference count. |
1da177e4c Linux-2.6.12-rc2 |
1235 |
* |
0b2d0724e fs: simplify iget... |
1236 1237 |
* 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 |
1238 |
* |
0b2d0724e fs: simplify iget... |
1239 |
* Note: @test is called with the inode_hash_lock held, so can't sleep. |
1da177e4c Linux-2.6.12-rc2 |
1240 1241 1242 1243 |
*/ struct inode *ilookup5(struct super_block *sb, unsigned long hashval, int (*test)(struct inode *, void *), void *data) { |
2864f3014 iget_locked et.al... |
1244 1245 1246 1247 |
struct inode *inode; again: inode = ilookup5_nowait(sb, hashval, test, data); if (inode) { |
0b2d0724e fs: simplify iget... |
1248 |
wait_on_inode(inode); |
2864f3014 iget_locked et.al... |
1249 1250 1251 1252 1253 |
if (unlikely(inode_unhashed(inode))) { iput(inode); goto again; } } |
0b2d0724e fs: simplify iget... |
1254 |
return inode; |
1da177e4c Linux-2.6.12-rc2 |
1255 |
} |
1da177e4c Linux-2.6.12-rc2 |
1256 1257 1258 1259 1260 1261 1262 |
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... |
1263 1264 |
* 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 |
1265 1266 1267 1268 |
*/ 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 |
1269 |
struct inode *inode; |
2864f3014 iget_locked et.al... |
1270 |
again: |
0b2d0724e fs: simplify iget... |
1271 1272 1273 |
spin_lock(&inode_hash_lock); inode = find_inode_fast(sb, head, ino); spin_unlock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
1274 |
|
2864f3014 iget_locked et.al... |
1275 |
if (inode) { |
0b2d0724e fs: simplify iget... |
1276 |
wait_on_inode(inode); |
2864f3014 iget_locked et.al... |
1277 1278 1279 1280 1281 |
if (unlikely(inode_unhashed(inode))) { iput(inode); goto again; } } |
0b2d0724e fs: simplify iget... |
1282 |
return inode; |
1da177e4c Linux-2.6.12-rc2 |
1283 |
} |
0b2d0724e fs: simplify iget... |
1284 |
EXPORT_SYMBOL(ilookup); |
1da177e4c Linux-2.6.12-rc2 |
1285 |
|
fe032c422 vfs: add find_ino... |
1286 1287 1288 1289 1290 1291 1292 1293 1294 1295 1296 1297 1298 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 1334 |
/** * find_inode_nowait - find an inode in the inode cache * @sb: super block of file system to search * @hashval: hash value (usually inode number) to search for * @match: callback used for comparisons between inodes * @data: opaque data pointer to pass to @match * * Search for the inode specified by @hashval and @data in the inode * cache, where the helper function @match will return 0 if the inode * does not match, 1 if the inode does match, and -1 if the search * should be stopped. The @match function must be responsible for * taking the i_lock spin_lock and checking i_state for an inode being * freed or being initialized, and incrementing the reference count * before returning 1. It also must not sleep, since it is called with * the inode_hash_lock spinlock held. * * This is a even more generalized version of ilookup5() when the * function must never block --- find_inode() can block in * __wait_on_freeing_inode() --- or when the caller can not increment * the reference count because the resulting iput() might cause an * inode eviction. The tradeoff is that the @match funtion must be * very carefully implemented. */ struct inode *find_inode_nowait(struct super_block *sb, unsigned long hashval, int (*match)(struct inode *, unsigned long, void *), void *data) { struct hlist_head *head = inode_hashtable + hash(sb, hashval); struct inode *inode, *ret_inode = NULL; int mval; spin_lock(&inode_hash_lock); hlist_for_each_entry(inode, head, i_hash) { if (inode->i_sb != sb) continue; mval = match(inode, hashval, data); if (mval == 0) continue; if (mval == 1) ret_inode = inode; goto out; } out: spin_unlock(&inode_hash_lock); return ret_inode; } EXPORT_SYMBOL(find_inode_nowait); |
261bca86e nfsd/create race ... |
1335 1336 1337 1338 1339 |
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 ... |
1340 |
|
261bca86e nfsd/create race ... |
1341 |
while (1) { |
72a43d63c ext3/4 with synch... |
1342 |
struct inode *old = NULL; |
67a23c494 fs: rename inode_... |
1343 |
spin_lock(&inode_hash_lock); |
b67bfe0d4 hlist: drop the n... |
1344 |
hlist_for_each_entry(old, head, i_hash) { |
72a43d63c ext3/4 with synch... |
1345 1346 1347 1348 |
if (old->i_ino != ino) continue; if (old->i_sb != sb) continue; |
250df6ed2 fs: protect inode... |
1349 1350 1351 |
spin_lock(&old->i_lock); if (old->i_state & (I_FREEING|I_WILL_FREE)) { spin_unlock(&old->i_lock); |
72a43d63c ext3/4 with synch... |
1352 |
continue; |
250df6ed2 fs: protect inode... |
1353 |
} |
72a43d63c ext3/4 with synch... |
1354 1355 |
break; } |
b67bfe0d4 hlist: drop the n... |
1356 |
if (likely(!old)) { |
250df6ed2 fs: protect inode... |
1357 1358 |
spin_lock(&inode->i_lock); inode->i_state |= I_NEW; |
261bca86e nfsd/create race ... |
1359 |
hlist_add_head(&inode->i_hash, head); |
250df6ed2 fs: protect inode... |
1360 |
spin_unlock(&inode->i_lock); |
67a23c494 fs: rename inode_... |
1361 |
spin_unlock(&inode_hash_lock); |
261bca86e nfsd/create race ... |
1362 1363 1364 |
return 0; } __iget(old); |
250df6ed2 fs: protect inode... |
1365 |
spin_unlock(&old->i_lock); |
67a23c494 fs: rename inode_... |
1366 |
spin_unlock(&inode_hash_lock); |
261bca86e nfsd/create race ... |
1367 |
wait_on_inode(old); |
1d3382cbf new helper: inode... |
1368 |
if (unlikely(!inode_unhashed(old))) { |
261bca86e nfsd/create race ... |
1369 1370 1371 1372 1373 1374 |
iput(old); return -EBUSY; } iput(old); } } |
261bca86e nfsd/create race ... |
1375 1376 1377 1378 1379 1380 1381 |
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 ... |
1382 |
|
261bca86e nfsd/create race ... |
1383 |
while (1) { |
72a43d63c ext3/4 with synch... |
1384 |
struct inode *old = NULL; |
67a23c494 fs: rename inode_... |
1385 |
spin_lock(&inode_hash_lock); |
b67bfe0d4 hlist: drop the n... |
1386 |
hlist_for_each_entry(old, head, i_hash) { |
72a43d63c ext3/4 with synch... |
1387 1388 1389 1390 |
if (old->i_sb != sb) continue; if (!test(old, data)) continue; |
250df6ed2 fs: protect inode... |
1391 1392 1393 |
spin_lock(&old->i_lock); if (old->i_state & (I_FREEING|I_WILL_FREE)) { spin_unlock(&old->i_lock); |
72a43d63c ext3/4 with synch... |
1394 |
continue; |
250df6ed2 fs: protect inode... |
1395 |
} |
72a43d63c ext3/4 with synch... |
1396 1397 |
break; } |
b67bfe0d4 hlist: drop the n... |
1398 |
if (likely(!old)) { |
250df6ed2 fs: protect inode... |
1399 1400 |
spin_lock(&inode->i_lock); inode->i_state |= I_NEW; |
261bca86e nfsd/create race ... |
1401 |
hlist_add_head(&inode->i_hash, head); |
250df6ed2 fs: protect inode... |
1402 |
spin_unlock(&inode->i_lock); |
67a23c494 fs: rename inode_... |
1403 |
spin_unlock(&inode_hash_lock); |
261bca86e nfsd/create race ... |
1404 1405 1406 |
return 0; } __iget(old); |
250df6ed2 fs: protect inode... |
1407 |
spin_unlock(&old->i_lock); |
67a23c494 fs: rename inode_... |
1408 |
spin_unlock(&inode_hash_lock); |
261bca86e nfsd/create race ... |
1409 |
wait_on_inode(old); |
1d3382cbf new helper: inode... |
1410 |
if (unlikely(!inode_unhashed(old))) { |
261bca86e nfsd/create race ... |
1411 1412 1413 1414 1415 1416 |
iput(old); return -EBUSY; } iput(old); } } |
261bca86e nfsd/create race ... |
1417 |
EXPORT_SYMBOL(insert_inode_locked4); |
1da177e4c Linux-2.6.12-rc2 |
1418 |
|
45321ac54 Make ->drop_inode... |
1419 1420 1421 1422 1423 |
int generic_delete_inode(struct inode *inode) { return 1; } EXPORT_SYMBOL(generic_delete_inode); |
1da177e4c Linux-2.6.12-rc2 |
1424 |
/* |
45321ac54 Make ->drop_inode... |
1425 1426 |
* Called when we're dropping the last reference * to an inode. |
22fe40421 vfs: split generi... |
1427 |
* |
45321ac54 Make ->drop_inode... |
1428 1429 1430 1431 1432 |
* 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... |
1433 |
*/ |
45321ac54 Make ->drop_inode... |
1434 |
static void iput_final(struct inode *inode) |
1da177e4c Linux-2.6.12-rc2 |
1435 1436 |
{ struct super_block *sb = inode->i_sb; |
45321ac54 Make ->drop_inode... |
1437 1438 |
const struct super_operations *op = inode->i_sb->s_op; int drop; |
250df6ed2 fs: protect inode... |
1439 |
WARN_ON(inode->i_state & I_NEW); |
e7f590970 kill useless chec... |
1440 |
if (op->drop_inode) |
45321ac54 Make ->drop_inode... |
1441 1442 1443 |
drop = op->drop_inode(inode); else drop = generic_drop_inode(inode); |
1da177e4c Linux-2.6.12-rc2 |
1444 |
|
b2b2af8e6 fs: factor inode ... |
1445 1446 |
if (!drop && (sb->s_flags & MS_ACTIVE)) { inode->i_state |= I_REFERENCED; |
4eff96dd5 writeback: put un... |
1447 |
inode_add_lru(inode); |
b2b2af8e6 fs: factor inode ... |
1448 |
spin_unlock(&inode->i_lock); |
b2b2af8e6 fs: factor inode ... |
1449 1450 |
return; } |
45321ac54 Make ->drop_inode... |
1451 |
if (!drop) { |
991114c6f [PATCH] fix for p... |
1452 |
inode->i_state |= I_WILL_FREE; |
250df6ed2 fs: protect inode... |
1453 |
spin_unlock(&inode->i_lock); |
1da177e4c Linux-2.6.12-rc2 |
1454 |
write_inode_now(inode, 1); |
250df6ed2 fs: protect inode... |
1455 |
spin_lock(&inode->i_lock); |
7ef0d7377 fs: new inode i_s... |
1456 |
WARN_ON(inode->i_state & I_NEW); |
991114c6f [PATCH] fix for p... |
1457 |
inode->i_state &= ~I_WILL_FREE; |
1da177e4c Linux-2.6.12-rc2 |
1458 |
} |
7ccf19a80 fs: inode split I... |
1459 |
|
991114c6f [PATCH] fix for p... |
1460 |
inode->i_state |= I_FREEING; |
c4ae0c654 vfs: avoid call t... |
1461 1462 |
if (!list_empty(&inode->i_lru)) inode_lru_list_del(inode); |
b2b2af8e6 fs: factor inode ... |
1463 |
spin_unlock(&inode->i_lock); |
b2b2af8e6 fs: factor inode ... |
1464 |
|
644da5960 fs/inode.c:evict(... |
1465 |
evict(inode); |
1da177e4c Linux-2.6.12-rc2 |
1466 |
} |
1da177e4c Linux-2.6.12-rc2 |
1467 |
/** |
6b3304b53 Make checkpatch.p... |
1468 |
* iput - put an inode |
1da177e4c Linux-2.6.12-rc2 |
1469 1470 1471 1472 1473 1474 1475 1476 1477 |
* @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) { |
0ae45f63d vfs: add support ... |
1478 1479 1480 1481 1482 1483 1484 1485 1486 1487 1488 1489 1490 1491 |
if (!inode) return; BUG_ON(inode->i_state & I_CLEAR); retry: if (atomic_dec_and_lock(&inode->i_count, &inode->i_lock)) { if (inode->i_nlink && (inode->i_state & I_DIRTY_TIME)) { atomic_inc(&inode->i_count); inode->i_state &= ~I_DIRTY_TIME; spin_unlock(&inode->i_lock); trace_writeback_lazytime_iput(inode); mark_inode_dirty_sync(inode); goto retry; } iput_final(inode); |
1da177e4c Linux-2.6.12-rc2 |
1492 1493 |
} } |
1da177e4c Linux-2.6.12-rc2 |
1494 1495 1496 1497 1498 1499 1500 1501 1502 1503 |
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... |
1504 |
* disk block relative to the disk start that holds that block of the |
1da177e4c Linux-2.6.12-rc2 |
1505 1506 |
* file. */ |
6b3304b53 Make checkpatch.p... |
1507 |
sector_t bmap(struct inode *inode, sector_t block) |
1da177e4c Linux-2.6.12-rc2 |
1508 1509 1510 1511 1512 1513 |
{ 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 |
1514 |
EXPORT_SYMBOL(bmap); |
11ff6f05f Allow relatime to... |
1515 |
/* |
598e3c8f7 vfs: update ovl i... |
1516 1517 1518 1519 1520 1521 1522 1523 1524 1525 1526 1527 1528 1529 1530 1531 1532 1533 |
* Update times in overlayed inode from underlying real inode */ static void update_ovl_inode_times(struct dentry *dentry, struct inode *inode, bool rcu) { if (!rcu) { struct inode *realinode = d_real_inode(dentry); if (unlikely(inode != realinode) && (!timespec_equal(&inode->i_mtime, &realinode->i_mtime) || !timespec_equal(&inode->i_ctime, &realinode->i_ctime))) { inode->i_mtime = realinode->i_mtime; inode->i_ctime = realinode->i_ctime; } } } /* |
11ff6f05f Allow relatime to... |
1534 1535 1536 1537 |
* 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. */ |
598e3c8f7 vfs: update ovl i... |
1538 1539 |
static int relatime_need_update(const struct path *path, struct inode *inode, struct timespec now, bool rcu) |
11ff6f05f Allow relatime to... |
1540 |
{ |
598e3c8f7 vfs: update ovl i... |
1541 |
if (!(path->mnt->mnt_flags & MNT_RELATIME)) |
11ff6f05f Allow relatime to... |
1542 |
return 1; |
598e3c8f7 vfs: update ovl i... |
1543 1544 |
update_ovl_inode_times(path->dentry, inode, rcu); |
11ff6f05f Allow relatime to... |
1545 1546 1547 1548 1549 1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 1560 1561 1562 1563 1564 1565 1566 |
/* * 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; } |
0ae45f63d vfs: add support ... |
1567 |
int generic_update_time(struct inode *inode, struct timespec *time, int flags) |
c3b2da314 fs: introduce ino... |
1568 |
{ |
0ae45f63d vfs: add support ... |
1569 |
int iflags = I_DIRTY_TIME; |
c3b2da314 fs: introduce ino... |
1570 1571 1572 1573 1574 1575 1576 1577 1578 |
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; |
0ae45f63d vfs: add support ... |
1579 1580 1581 1582 |
if (!(inode->i_sb->s_flags & MS_LAZYTIME) || (flags & S_VERSION)) iflags |= I_DIRTY_SYNC; __mark_inode_dirty(inode, iflags); |
c3b2da314 fs: introduce ino... |
1583 1584 |
return 0; } |
0ae45f63d vfs: add support ... |
1585 1586 1587 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 |
EXPORT_SYMBOL(generic_update_time); /* * 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) { int (*update_time)(struct inode *, struct timespec *, int); update_time = inode->i_op->update_time ? inode->i_op->update_time : generic_update_time; return update_time(inode, time, flags); } |
c3b2da314 fs: introduce ino... |
1600 |
|
1da177e4c Linux-2.6.12-rc2 |
1601 |
/** |
869243a0f [PATCH] remove up... |
1602 |
* touch_atime - update the access time |
185553b22 fs: fix inode.c k... |
1603 |
* @path: the &struct path to update |
30fdc8ee0 fs/inode.c: fix k... |
1604 |
* @inode: inode to update |
1da177e4c Linux-2.6.12-rc2 |
1605 1606 1607 1608 1609 |
* * 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. */ |
598e3c8f7 vfs: update ovl i... |
1610 1611 |
bool __atime_needs_update(const struct path *path, struct inode *inode, bool rcu) |
1da177e4c Linux-2.6.12-rc2 |
1612 |
{ |
68ac1234f switch touch_atim... |
1613 |
struct vfsmount *mnt = path->mnt; |
1da177e4c Linux-2.6.12-rc2 |
1614 |
struct timespec now; |
cdb70f3f7 [PATCH] r/o bind ... |
1615 |
if (inode->i_flags & S_NOATIME) |
8fa9dd246 VFS/namei: make t... |
1616 |
return false; |
0bd23d09b vfs: Don't modify... |
1617 1618 1619 1620 1621 1622 |
/* Atime updates will likely cause i_uid and i_gid to be written * back improprely if their true value is unknown to the vfs. */ if (HAS_UNMAPPED_ID(inode)) return false; |
37756ced1 [PATCH] avoid one... |
1623 |
if (IS_NOATIME(inode)) |
8fa9dd246 VFS/namei: make t... |
1624 |
return false; |
b22761384 [PATCH] touch_ati... |
1625 |
if ((inode->i_sb->s_flags & MS_NODIRATIME) && S_ISDIR(inode->i_mode)) |
8fa9dd246 VFS/namei: make t... |
1626 |
return false; |
47ae32d6a [PATCH] relative ... |
1627 |
|
cdb70f3f7 [PATCH] r/o bind ... |
1628 |
if (mnt->mnt_flags & MNT_NOATIME) |
8fa9dd246 VFS/namei: make t... |
1629 |
return false; |
cdb70f3f7 [PATCH] r/o bind ... |
1630 |
if ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)) |
8fa9dd246 VFS/namei: make t... |
1631 |
return false; |
1da177e4c Linux-2.6.12-rc2 |
1632 |
|
c2050a454 fs: Replace curre... |
1633 |
now = current_time(inode); |
11ff6f05f Allow relatime to... |
1634 |
|
598e3c8f7 vfs: update ovl i... |
1635 |
if (!relatime_need_update(path, inode, now, rcu)) |
8fa9dd246 VFS/namei: make t... |
1636 |
return false; |
11ff6f05f Allow relatime to... |
1637 |
|
47ae32d6a [PATCH] relative ... |
1638 |
if (timespec_equal(&inode->i_atime, &now)) |
8fa9dd246 VFS/namei: make t... |
1639 1640 1641 1642 1643 1644 1645 1646 1647 1648 |
return false; return true; } void touch_atime(const struct path *path) { struct vfsmount *mnt = path->mnt; struct inode *inode = d_inode(path->dentry); struct timespec now; |
598e3c8f7 vfs: update ovl i... |
1649 |
if (!__atime_needs_update(path, inode, false)) |
b12536c27 vfs: optimization... |
1650 |
return; |
5d37e9e6d fs: Skip atime up... |
1651 |
if (!sb_start_write_trylock(inode->i_sb)) |
b12536c27 vfs: optimization... |
1652 |
return; |
47ae32d6a [PATCH] relative ... |
1653 |
|
8fa9dd246 VFS/namei: make t... |
1654 |
if (__mnt_want_write(mnt) != 0) |
5d37e9e6d fs: Skip atime up... |
1655 |
goto skip_update; |
c3b2da314 fs: introduce ino... |
1656 1657 1658 1659 1660 1661 |
/* * 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... |
1662 1663 |
* 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... |
1664 |
*/ |
c2050a454 fs: Replace curre... |
1665 |
now = current_time(inode); |
c3b2da314 fs: introduce ino... |
1666 |
update_time(inode, &now, S_ATIME); |
5d37e9e6d fs: Skip atime up... |
1667 1668 1669 |
__mnt_drop_write(mnt); skip_update: sb_end_write(inode->i_sb); |
1da177e4c Linux-2.6.12-rc2 |
1670 |
} |
869243a0f [PATCH] remove up... |
1671 |
EXPORT_SYMBOL(touch_atime); |
1da177e4c Linux-2.6.12-rc2 |
1672 |
|
3ed37648e fs: move file_rem... |
1673 1674 1675 1676 1677 1678 1679 1680 |
/* * The logic we want is * * if suid or (sgid and xgrp) * remove privs */ int should_remove_suid(struct dentry *dentry) { |
df2b1afde VFS: fs/inode.c h... |
1681 |
umode_t mode = d_inode(dentry)->i_mode; |
3ed37648e fs: move file_rem... |
1682 1683 1684 1685 1686 1687 1688 1689 1690 1691 1692 1693 1694 1695 1696 1697 1698 1699 1700 |
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); |
dbfae0cdc fs: Provide funct... |
1701 1702 1703 1704 1705 |
/* * Return mask of changes for notify_change() that need to be done as a * response to write or truncate. Return 0 if nothing has to be changed. * Negative value on error (change should be denied). */ |
45f147a1b fs: Call security... |
1706 |
int dentry_needs_remove_privs(struct dentry *dentry) |
dbfae0cdc fs: Provide funct... |
1707 |
{ |
dbfae0cdc fs: Provide funct... |
1708 1709 1710 1711 1712 1713 1714 1715 1716 1717 1718 1719 1720 1721 1722 |
struct inode *inode = d_inode(dentry); int mask = 0; int ret; if (IS_NOSEC(inode)) return 0; mask = should_remove_suid(dentry); ret = security_inode_need_killpriv(dentry); if (ret < 0) return ret; if (ret) mask |= ATTR_KILL_PRIV; return mask; } |
dbfae0cdc fs: Provide funct... |
1723 1724 |
static int __remove_privs(struct dentry *dentry, int kill) |
3ed37648e fs: move file_rem... |
1725 1726 1727 1728 |
{ struct iattr newattrs; newattrs.ia_valid = ATTR_FORCE | kill; |
27ac0ffea locks: break dele... |
1729 1730 1731 1732 1733 |
/* * 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... |
1734 |
} |
5fa8e0a1c fs: Rename file_r... |
1735 1736 1737 1738 1739 |
/* * Remove special file priviledges (suid, capabilities) when file is written * to or truncated. */ int file_remove_privs(struct file *file) |
3ed37648e fs: move file_rem... |
1740 |
{ |
c1892c377 vfs: fix deadlock... |
1741 1742 |
struct dentry *dentry = file_dentry(file); struct inode *inode = file_inode(file); |
dbfae0cdc fs: Provide funct... |
1743 |
int kill; |
3ed37648e fs: move file_rem... |
1744 1745 1746 1747 1748 |
int error = 0; /* Fast path for nothing security related */ if (IS_NOSEC(inode)) return 0; |
c1892c377 vfs: fix deadlock... |
1749 |
kill = dentry_needs_remove_privs(dentry); |
dbfae0cdc fs: Provide funct... |
1750 1751 1752 1753 |
if (kill < 0) return kill; if (kill) error = __remove_privs(dentry, kill); |
2426f3910 fs: Fix S_NOSEC h... |
1754 1755 |
if (!error) inode_has_no_xattr(inode); |
3ed37648e fs: move file_rem... |
1756 1757 1758 |
return error; } |
5fa8e0a1c fs: Rename file_r... |
1759 |
EXPORT_SYMBOL(file_remove_privs); |
3ed37648e fs: move file_rem... |
1760 |
|
1da177e4c Linux-2.6.12-rc2 |
1761 |
/** |
870f48179 [PATCH] replace i... |
1762 1763 |
* file_update_time - update mtime and ctime time * @file: file accessed |
1da177e4c Linux-2.6.12-rc2 |
1764 |
* |
870f48179 [PATCH] replace i... |
1765 1766 1767 1768 |
* 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... |
1769 |
* S_NOCMTIME inode flag, e.g. for network filesystem where these |
c3b2da314 fs: introduce ino... |
1770 1771 |
* 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 |
1772 |
*/ |
c3b2da314 fs: introduce ino... |
1773 |
int file_update_time(struct file *file) |
1da177e4c Linux-2.6.12-rc2 |
1774 |
{ |
496ad9aa8 new helper: file_... |
1775 |
struct inode *inode = file_inode(file); |
1da177e4c Linux-2.6.12-rc2 |
1776 |
struct timespec now; |
c3b2da314 fs: introduce ino... |
1777 1778 |
int sync_it = 0; int ret; |
1da177e4c Linux-2.6.12-rc2 |
1779 |
|
ce06e0b21 vfs: optimize tou... |
1780 |
/* First try to exhaust all avenues to not sync */ |
1da177e4c Linux-2.6.12-rc2 |
1781 |
if (IS_NOCMTIME(inode)) |
c3b2da314 fs: introduce ino... |
1782 |
return 0; |
20ddee2c7 [PATCH] r/o bind ... |
1783 |
|
c2050a454 fs: Replace curre... |
1784 |
now = current_time(inode); |
ce06e0b21 vfs: optimize tou... |
1785 1786 |
if (!timespec_equal(&inode->i_mtime, &now)) sync_it = S_MTIME; |
1da177e4c Linux-2.6.12-rc2 |
1787 |
|
ce06e0b21 vfs: optimize tou... |
1788 1789 |
if (!timespec_equal(&inode->i_ctime, &now)) sync_it |= S_CTIME; |
870f48179 [PATCH] replace i... |
1790 |
|
ce06e0b21 vfs: optimize tou... |
1791 1792 |
if (IS_I_VERSION(inode)) sync_it |= S_VERSION; |
7a224228e vfs: Add 64 bit i... |
1793 |
|
ce06e0b21 vfs: optimize tou... |
1794 |
if (!sync_it) |
c3b2da314 fs: introduce ino... |
1795 |
return 0; |
ce06e0b21 vfs: optimize tou... |
1796 1797 |
/* Finally allowed to write? Takes lock. */ |
eb04c2828 fs: Add freezing ... |
1798 |
if (__mnt_want_write_file(file)) |
c3b2da314 fs: introduce ino... |
1799 |
return 0; |
ce06e0b21 vfs: optimize tou... |
1800 |
|
c3b2da314 fs: introduce ino... |
1801 |
ret = update_time(inode, &now, sync_it); |
eb04c2828 fs: Add freezing ... |
1802 |
__mnt_drop_write_file(file); |
c3b2da314 fs: introduce ino... |
1803 1804 |
return ret; |
1da177e4c Linux-2.6.12-rc2 |
1805 |
} |
870f48179 [PATCH] replace i... |
1806 |
EXPORT_SYMBOL(file_update_time); |
1da177e4c Linux-2.6.12-rc2 |
1807 1808 1809 1810 1811 1812 1813 1814 1815 |
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 |
1816 |
EXPORT_SYMBOL(inode_needs_sync); |
1da177e4c Linux-2.6.12-rc2 |
1817 |
/* |
168a9fd6a [PATCH] __wait_on... |
1818 1819 1820 1821 1822 1823 |
* 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 |
1824 |
* It doesn't matter if I_NEW is not set initially, a call to |
250df6ed2 fs: protect inode... |
1825 1826 |
* wake_up_bit(&inode->i_state, __I_NEW) after removing from the hash list * will DTRT. |
1da177e4c Linux-2.6.12-rc2 |
1827 1828 1829 1830 |
*/ static void __wait_on_freeing_inode(struct inode *inode) { wait_queue_head_t *wq; |
eaff8079d kill I_LOCK |
1831 1832 |
DEFINE_WAIT_BIT(wait, &inode->i_state, __I_NEW); wq = bit_waitqueue(&inode->i_state, __I_NEW); |
1da177e4c Linux-2.6.12-rc2 |
1833 |
prepare_to_wait(wq, &wait.wait, TASK_UNINTERRUPTIBLE); |
250df6ed2 fs: protect inode... |
1834 |
spin_unlock(&inode->i_lock); |
67a23c494 fs: rename inode_... |
1835 |
spin_unlock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
1836 1837 |
schedule(); finish_wait(wq, &wait.wait); |
67a23c494 fs: rename inode_... |
1838 |
spin_lock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
1839 |
} |
1da177e4c Linux-2.6.12-rc2 |
1840 1841 1842 1843 1844 1845 1846 1847 1848 1849 1850 1851 1852 1853 1854 |
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... |
1855 |
unsigned int loop; |
1da177e4c Linux-2.6.12-rc2 |
1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 |
/* 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... |
1871 |
0, |
1da177e4c Linux-2.6.12-rc2 |
1872 |
0); |
074b85175 vfs: fix panic in... |
1873 |
for (loop = 0; loop < (1U << i_hash_shift); loop++) |
1da177e4c Linux-2.6.12-rc2 |
1874 1875 |
INIT_HLIST_HEAD(&inode_hashtable[loop]); } |
74bf17cff fs: remove the un... |
1876 |
void __init inode_init(void) |
1da177e4c Linux-2.6.12-rc2 |
1877 |
{ |
074b85175 vfs: fix panic in... |
1878 |
unsigned int loop; |
1da177e4c Linux-2.6.12-rc2 |
1879 1880 |
/* inode slab cache */ |
b0196009d [PATCH] cpuset me... |
1881 1882 1883 1884 |
inode_cachep = kmem_cache_create("inode_cache", sizeof(struct inode), 0, (SLAB_RECLAIM_ACCOUNT|SLAB_PANIC| |
5d097056c kmemcg: account c... |
1885 |
SLAB_MEM_SPREAD|SLAB_ACCOUNT), |
20c2df83d mm: Remove slab d... |
1886 |
init_once); |
1da177e4c Linux-2.6.12-rc2 |
1887 1888 1889 1890 1891 1892 1893 1894 1895 1896 1897 1898 1899 |
/* 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... |
1900 |
0, |
1da177e4c Linux-2.6.12-rc2 |
1901 |
0); |
074b85175 vfs: fix panic in... |
1902 |
for (loop = 0; loop < (1U << i_hash_shift); loop++) |
1da177e4c Linux-2.6.12-rc2 |
1903 1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 |
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... |
1916 |
inode->i_fop = &pipefifo_fops; |
1da177e4c Linux-2.6.12-rc2 |
1917 |
else if (S_ISSOCK(mode)) |
bd9b51e79 make default ->i_... |
1918 |
; /* leave it no_open_fops */ |
1da177e4c Linux-2.6.12-rc2 |
1919 |
else |
af0d9ae81 fs/inode.c: add d... |
1920 1921 1922 1923 |
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 |
1924 1925 |
} EXPORT_SYMBOL(init_special_inode); |
a1bd120d1 vfs: Add inode ui... |
1926 1927 |
/** |
eaae668d0 fs/inode: Fix ker... |
1928 |
* inode_init_owner - Init uid,gid,mode for new inode according to posix standards |
a1bd120d1 vfs: Add inode ui... |
1929 1930 1931 1932 1933 |
* @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... |
1934 |
umode_t mode) |
a1bd120d1 vfs: Add inode ui... |
1935 1936 1937 1938 1939 1940 1941 1942 1943 1944 1945 |
{ 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... |
1946 |
|
2e1496707 userns: rename is... |
1947 1948 1949 1950 |
/** * inode_owner_or_capable - check current task permissions to inode * @inode: inode being checked * |
23adbe12e fs,userns: Change... |
1951 1952 |
* 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... |
1953 |
*/ |
2e1496707 userns: rename is... |
1954 |
bool inode_owner_or_capable(const struct inode *inode) |
e795b7179 userns: userns: c... |
1955 |
{ |
23adbe12e fs,userns: Change... |
1956 |
struct user_namespace *ns; |
92361636e userns: Store uid... |
1957 |
if (uid_eq(current_fsuid(), inode->i_uid)) |
e795b7179 userns: userns: c... |
1958 |
return true; |
23adbe12e fs,userns: Change... |
1959 1960 1961 |
ns = current_user_ns(); if (ns_capable(ns, CAP_FOWNER) && kuid_has_mapping(ns, inode->i_uid)) |
e795b7179 userns: userns: c... |
1962 1963 1964 |
return true; return false; } |
2e1496707 userns: rename is... |
1965 |
EXPORT_SYMBOL(inode_owner_or_capable); |
1d59d61f6 NFS: Ensure that ... |
1966 1967 1968 1969 1970 1971 1972 1973 1974 1975 1976 1977 1978 1979 1980 1981 1982 1983 1984 1985 1986 1987 1988 1989 1990 1991 1992 1993 1994 1995 1996 1997 1998 1999 2000 |
/* * 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); /* |
5f16f3225 ext4: atomically ... |
2001 2002 2003 2004 2005 2006 2007 |
* 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 |
5fa8e0a1c fs: Rename file_r... |
2008 2009 |
* code path which doesn't today so we use cmpxchg() out of an abundance * of caution. |
5f16f3225 ext4: atomically ... |
2010 2011 2012 2013 2014 2015 2016 2017 2018 2019 2020 2021 2022 2023 2024 2025 2026 2027 2028 |
* * 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); |
21fc61c73 don't put symlink... |
2029 2030 2031 2032 2033 2034 |
void inode_nohighmem(struct inode *inode) { mapping_set_gfp_mask(inode->i_mapping, GFP_USER); } EXPORT_SYMBOL(inode_nohighmem); |
3cd886666 vfs: Add current_... |
2035 2036 2037 2038 2039 2040 2041 2042 2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 |
/** * current_time - Return FS time * @inode: inode. * * Return the current time truncated to the time granularity supported by * the fs. * * Note that inode and inode->sb cannot be NULL. * Otherwise, the function warns and returns time without truncation. */ struct timespec current_time(struct inode *inode) { struct timespec now = current_kernel_time(); if (unlikely(!inode->i_sb)) { WARN(1, "current_time() called with uninitialized super_block in the inode"); return now; } return timespec_trunc(now, inode->i_sb->s_time_gran); } EXPORT_SYMBOL(current_time); |