Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | * (C) 1997 Linus Torvalds |
Christoph Hellwig | 4b4563d | 2011-05-27 09:28:01 -0400 | [diff] [blame] | 3 | * (C) 1999 Andrea Arcangeli <andrea@suse.de> (dynamic inode allocation) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | */ |
Al Viro | e59cc47 | 2011-12-07 13:17:19 -0500 | [diff] [blame] | 5 | #include <linux/export.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | #include <linux/fs.h> |
| 7 | #include <linux/mm.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | #include <linux/backing-dev.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 9 | #include <linux/hash.h> |
| 10 | #include <linux/swap.h> |
| 11 | #include <linux/security.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | #include <linux/cdev.h> |
| 13 | #include <linux/bootmem.h> |
Eric Paris | 3be25f4 | 2009-05-21 17:01:26 -0400 | [diff] [blame] | 14 | #include <linux/fsnotify.h> |
Christoph Hellwig | fc33a7b | 2006-01-09 20:52:17 -0800 | [diff] [blame] | 15 | #include <linux/mount.h> |
Al Viro | f19d4a8 | 2009-06-08 19:50:45 -0400 | [diff] [blame] | 16 | #include <linux/posix_acl.h> |
Heiko Carstens | 9ce6e0b | 2011-05-22 18:54:21 +0200 | [diff] [blame] | 17 | #include <linux/prefetch.h> |
Christoph Hellwig | 4b4563d | 2011-05-27 09:28:01 -0400 | [diff] [blame] | 18 | #include <linux/buffer_head.h> /* for inode_has_buffers */ |
Miklos Szeredi | 7ada4db | 2011-11-21 12:11:32 +0100 | [diff] [blame] | 19 | #include <linux/ratelimit.h> |
Dave Chinner | bc3b14c | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 20 | #include <linux/list_lru.h> |
Theodore Ts'o | 0ae45f6 | 2015-02-02 00:37:00 -0500 | [diff] [blame] | 21 | #include <trace/events/writeback.h> |
Dave Chinner | a66979a | 2011-03-22 22:23:41 +1100 | [diff] [blame] | 22 | #include "internal.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | |
| 24 | /* |
Christoph Hellwig | 4b4563d | 2011-05-27 09:28:01 -0400 | [diff] [blame] | 25 | * Inode locking rules: |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 26 | * |
| 27 | * inode->i_lock protects: |
| 28 | * inode->i_state, inode->i_hash, __iget() |
Dave Chinner | bc3b14c | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 29 | * Inode LRU list locks protect: |
Dave Chinner | 98b745c | 2011-07-08 14:14:39 +1000 | [diff] [blame] | 30 | * inode->i_sb->s_inode_lru, inode->i_lru |
Dave Chinner | 74278da | 2015-03-04 12:37:22 -0500 | [diff] [blame] | 31 | * inode->i_sb->s_inode_list_lock protects: |
| 32 | * inode->i_sb->s_inodes, inode->i_sb_list |
Christoph Hellwig | f758eea | 2011-04-21 18:19:44 -0600 | [diff] [blame] | 33 | * bdi->wb.list_lock protects: |
Dave Chinner | c7f5408 | 2015-03-04 14:07:22 -0500 | [diff] [blame] | 34 | * bdi->wb.b_{dirty,io,more_io,dirty_time}, inode->i_io_list |
Dave Chinner | 67a23c4 | 2011-03-22 22:23:42 +1100 | [diff] [blame] | 35 | * inode_hash_lock protects: |
| 36 | * inode_hashtable, inode->i_hash |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 37 | * |
| 38 | * Lock ordering: |
Dave Chinner | 55fa609 | 2011-03-22 22:23:40 +1100 | [diff] [blame] | 39 | * |
Dave Chinner | 74278da | 2015-03-04 12:37:22 -0500 | [diff] [blame] | 40 | * inode->i_sb->s_inode_list_lock |
Dave Chinner | 55fa609 | 2011-03-22 22:23:40 +1100 | [diff] [blame] | 41 | * inode->i_lock |
Dave Chinner | bc3b14c | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 42 | * Inode LRU list locks |
Dave Chinner | a66979a | 2011-03-22 22:23:41 +1100 | [diff] [blame] | 43 | * |
Christoph Hellwig | f758eea | 2011-04-21 18:19:44 -0600 | [diff] [blame] | 44 | * bdi->wb.list_lock |
Dave Chinner | a66979a | 2011-03-22 22:23:41 +1100 | [diff] [blame] | 45 | * inode->i_lock |
Dave Chinner | 67a23c4 | 2011-03-22 22:23:42 +1100 | [diff] [blame] | 46 | * |
| 47 | * inode_hash_lock |
Dave Chinner | 74278da | 2015-03-04 12:37:22 -0500 | [diff] [blame] | 48 | * inode->i_sb->s_inode_list_lock |
Dave Chinner | 67a23c4 | 2011-03-22 22:23:42 +1100 | [diff] [blame] | 49 | * inode->i_lock |
| 50 | * |
| 51 | * iunique_lock |
| 52 | * inode_hash_lock |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 53 | */ |
| 54 | |
Eric Dumazet | fa3536c | 2006-03-26 01:37:24 -0800 | [diff] [blame] | 55 | static unsigned int i_hash_mask __read_mostly; |
| 56 | static unsigned int i_hash_shift __read_mostly; |
Dave Chinner | 67a23c4 | 2011-03-22 22:23:42 +1100 | [diff] [blame] | 57 | static struct hlist_head *inode_hashtable __read_mostly; |
| 58 | static __cacheline_aligned_in_smp DEFINE_SPINLOCK(inode_hash_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | /* |
Jens Axboe | 7dcda1c | 2011-04-05 23:51:48 +0200 | [diff] [blame] | 61 | * Empty aops. Can be used for the cases where the user does not |
| 62 | * define any of the address_space operations. |
| 63 | */ |
| 64 | const struct address_space_operations empty_aops = { |
| 65 | }; |
| 66 | EXPORT_SYMBOL(empty_aops); |
| 67 | |
| 68 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | * Statistics gathering.. |
| 70 | */ |
| 71 | struct inodes_stat_t inodes_stat; |
| 72 | |
Glauber Costa | 3942c07 | 2013-08-28 10:17:53 +1000 | [diff] [blame] | 73 | static DEFINE_PER_CPU(unsigned long, nr_inodes); |
| 74 | static DEFINE_PER_CPU(unsigned long, nr_unused); |
Dave Chinner | cffbc8a | 2010-10-23 05:03:02 -0400 | [diff] [blame] | 75 | |
Manish Katiyar | 6b3304b | 2009-03-31 19:35:54 +0530 | [diff] [blame] | 76 | static struct kmem_cache *inode_cachep __read_mostly; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | |
Glauber Costa | 3942c07 | 2013-08-28 10:17:53 +1000 | [diff] [blame] | 78 | static long get_nr_inodes(void) |
Dave Chinner | cffbc8a | 2010-10-23 05:03:02 -0400 | [diff] [blame] | 79 | { |
Nick Piggin | 3e880fb | 2011-01-07 17:49:19 +1100 | [diff] [blame] | 80 | int i; |
Glauber Costa | 3942c07 | 2013-08-28 10:17:53 +1000 | [diff] [blame] | 81 | long sum = 0; |
Nick Piggin | 3e880fb | 2011-01-07 17:49:19 +1100 | [diff] [blame] | 82 | for_each_possible_cpu(i) |
| 83 | sum += per_cpu(nr_inodes, i); |
| 84 | return sum < 0 ? 0 : sum; |
Dave Chinner | cffbc8a | 2010-10-23 05:03:02 -0400 | [diff] [blame] | 85 | } |
| 86 | |
Glauber Costa | 3942c07 | 2013-08-28 10:17:53 +1000 | [diff] [blame] | 87 | static inline long get_nr_inodes_unused(void) |
Dave Chinner | cffbc8a | 2010-10-23 05:03:02 -0400 | [diff] [blame] | 88 | { |
Dave Chinner | fcb94f7 | 2011-07-08 14:14:38 +1000 | [diff] [blame] | 89 | int i; |
Glauber Costa | 3942c07 | 2013-08-28 10:17:53 +1000 | [diff] [blame] | 90 | long sum = 0; |
Dave Chinner | fcb94f7 | 2011-07-08 14:14:38 +1000 | [diff] [blame] | 91 | for_each_possible_cpu(i) |
| 92 | sum += per_cpu(nr_unused, i); |
| 93 | return sum < 0 ? 0 : sum; |
Dave Chinner | cffbc8a | 2010-10-23 05:03:02 -0400 | [diff] [blame] | 94 | } |
| 95 | |
Glauber Costa | 3942c07 | 2013-08-28 10:17:53 +1000 | [diff] [blame] | 96 | long get_nr_dirty_inodes(void) |
Dave Chinner | cffbc8a | 2010-10-23 05:03:02 -0400 | [diff] [blame] | 97 | { |
Nick Piggin | 3e880fb | 2011-01-07 17:49:19 +1100 | [diff] [blame] | 98 | /* not actually dirty inodes, but a wild approximation */ |
Glauber Costa | 3942c07 | 2013-08-28 10:17:53 +1000 | [diff] [blame] | 99 | long nr_dirty = get_nr_inodes() - get_nr_inodes_unused(); |
Dave Chinner | cffbc8a | 2010-10-23 05:03:02 -0400 | [diff] [blame] | 100 | return nr_dirty > 0 ? nr_dirty : 0; |
Dave Chinner | cffbc8a | 2010-10-23 05:03:02 -0400 | [diff] [blame] | 101 | } |
| 102 | |
| 103 | /* |
| 104 | * Handle nr_inode sysctl |
| 105 | */ |
| 106 | #ifdef CONFIG_SYSCTL |
Joe Perches | 1f7e061 | 2014-06-06 14:38:05 -0700 | [diff] [blame] | 107 | int proc_nr_inodes(struct ctl_table *table, int write, |
Dave Chinner | cffbc8a | 2010-10-23 05:03:02 -0400 | [diff] [blame] | 108 | void __user *buffer, size_t *lenp, loff_t *ppos) |
| 109 | { |
| 110 | inodes_stat.nr_inodes = get_nr_inodes(); |
Dave Chinner | fcb94f7 | 2011-07-08 14:14:38 +1000 | [diff] [blame] | 111 | inodes_stat.nr_unused = get_nr_inodes_unused(); |
Glauber Costa | 3942c07 | 2013-08-28 10:17:53 +1000 | [diff] [blame] | 112 | return proc_doulongvec_minmax(table, write, buffer, lenp, ppos); |
Dave Chinner | cffbc8a | 2010-10-23 05:03:02 -0400 | [diff] [blame] | 113 | } |
| 114 | #endif |
| 115 | |
Al Viro | bd9b51e | 2014-11-18 23:38:21 -0500 | [diff] [blame] | 116 | static int no_open(struct inode *inode, struct file *file) |
| 117 | { |
| 118 | return -ENXIO; |
| 119 | } |
| 120 | |
David Chinner | 2cb1599 | 2008-10-30 17:32:23 +1100 | [diff] [blame] | 121 | /** |
| 122 | * inode_init_always - perform inode structure intialisation |
Randy Dunlap | 0bc02f3 | 2009-01-06 14:41:13 -0800 | [diff] [blame] | 123 | * @sb: superblock inode belongs to |
| 124 | * @inode: inode to initialise |
David Chinner | 2cb1599 | 2008-10-30 17:32:23 +1100 | [diff] [blame] | 125 | * |
| 126 | * These are initializations that need to be done on every inode |
| 127 | * allocation as the fields are not initialised by slab allocation. |
| 128 | */ |
Christoph Hellwig | 54e3462 | 2009-08-07 14:38:25 -0300 | [diff] [blame] | 129 | int inode_init_always(struct super_block *sb, struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | { |
Alexey Dobriyan | 6e1d5dc | 2009-09-21 17:01:11 -0700 | [diff] [blame] | 131 | static const struct inode_operations empty_iops; |
Al Viro | bd9b51e | 2014-11-18 23:38:21 -0500 | [diff] [blame] | 132 | static const struct file_operations no_open_fops = {.open = no_open}; |
Manish Katiyar | 6b3304b | 2009-03-31 19:35:54 +0530 | [diff] [blame] | 133 | struct address_space *const mapping = &inode->i_data; |
David Chinner | 2cb1599 | 2008-10-30 17:32:23 +1100 | [diff] [blame] | 134 | |
| 135 | inode->i_sb = sb; |
| 136 | inode->i_blkbits = sb->s_blocksize_bits; |
| 137 | inode->i_flags = 0; |
| 138 | atomic_set(&inode->i_count, 1); |
| 139 | inode->i_op = &empty_iops; |
Al Viro | bd9b51e | 2014-11-18 23:38:21 -0500 | [diff] [blame] | 140 | inode->i_fop = &no_open_fops; |
Miklos Szeredi | a78ef70 | 2011-10-28 14:13:30 +0200 | [diff] [blame] | 141 | inode->__i_nlink = 1; |
Linus Torvalds | 3ddcd05 | 2011-08-06 22:45:50 -0700 | [diff] [blame] | 142 | inode->i_opflags = 0; |
Eric W. Biederman | 9236163 | 2012-02-08 07:07:50 -0800 | [diff] [blame] | 143 | i_uid_write(inode, 0); |
| 144 | i_gid_write(inode, 0); |
David Chinner | 2cb1599 | 2008-10-30 17:32:23 +1100 | [diff] [blame] | 145 | atomic_set(&inode->i_writecount, 0); |
| 146 | inode->i_size = 0; |
| 147 | inode->i_blocks = 0; |
| 148 | inode->i_bytes = 0; |
| 149 | inode->i_generation = 0; |
David Chinner | 2cb1599 | 2008-10-30 17:32:23 +1100 | [diff] [blame] | 150 | inode->i_pipe = NULL; |
| 151 | inode->i_bdev = NULL; |
| 152 | inode->i_cdev = NULL; |
Al Viro | 61ba64f | 2015-05-02 09:54:06 -0400 | [diff] [blame] | 153 | inode->i_link = NULL; |
Al Viro | 84e710d | 2016-04-15 00:58:55 -0400 | [diff] [blame] | 154 | inode->i_dir_seq = 0; |
David Chinner | 2cb1599 | 2008-10-30 17:32:23 +1100 | [diff] [blame] | 155 | inode->i_rdev = 0; |
| 156 | inode->dirtied_when = 0; |
Mimi Zohar | 6146f0d | 2009-02-04 09:06:57 -0500 | [diff] [blame] | 157 | |
Tahsin Erdogan | 3d65ae4 | 2016-02-16 13:34:39 -0800 | [diff] [blame] | 158 | #ifdef CONFIG_CGROUP_WRITEBACK |
| 159 | inode->i_wb_frn_winner = 0; |
| 160 | inode->i_wb_frn_avg_time = 0; |
| 161 | inode->i_wb_frn_history = 0; |
| 162 | #endif |
| 163 | |
Mimi Zohar | 6146f0d | 2009-02-04 09:06:57 -0500 | [diff] [blame] | 164 | if (security_inode_alloc(inode)) |
Christoph Hellwig | 54e3462 | 2009-08-07 14:38:25 -0300 | [diff] [blame] | 165 | goto out; |
David Chinner | 2cb1599 | 2008-10-30 17:32:23 +1100 | [diff] [blame] | 166 | spin_lock_init(&inode->i_lock); |
| 167 | lockdep_set_class(&inode->i_lock, &sb->s_type->i_lock_key); |
| 168 | |
Al Viro | 9902af7 | 2016-04-15 15:08:36 -0400 | [diff] [blame] | 169 | init_rwsem(&inode->i_rwsem); |
| 170 | lockdep_set_class(&inode->i_rwsem, &sb->s_type->i_mutex_key); |
David Chinner | 2cb1599 | 2008-10-30 17:32:23 +1100 | [diff] [blame] | 171 | |
Christoph Hellwig | bd5fe6c | 2011-06-24 14:29:43 -0400 | [diff] [blame] | 172 | atomic_set(&inode->i_dio_count, 0); |
David Chinner | 2cb1599 | 2008-10-30 17:32:23 +1100 | [diff] [blame] | 173 | |
| 174 | mapping->a_ops = &empty_aops; |
| 175 | mapping->host = inode; |
| 176 | mapping->flags = 0; |
David Herrmann | 4bb5f5d | 2014-08-08 14:25:25 -0700 | [diff] [blame] | 177 | atomic_set(&mapping->i_mmap_writable, 0); |
Hugh Dickins | 3c1d437 | 2009-01-06 14:39:23 -0800 | [diff] [blame] | 178 | mapping_set_gfp_mask(mapping, GFP_HIGHUSER_MOVABLE); |
Rafael Aquini | 252aa6f | 2012-12-11 16:02:35 -0800 | [diff] [blame] | 179 | mapping->private_data = NULL; |
David Chinner | 2cb1599 | 2008-10-30 17:32:23 +1100 | [diff] [blame] | 180 | mapping->writeback_index = 0; |
David Chinner | 2cb1599 | 2008-10-30 17:32:23 +1100 | [diff] [blame] | 181 | inode->i_private = NULL; |
| 182 | inode->i_mapping = mapping; |
Al Viro | b3d9b7a | 2012-06-09 13:51:19 -0400 | [diff] [blame] | 183 | INIT_HLIST_HEAD(&inode->i_dentry); /* buggered by rcu freeing */ |
Al Viro | f19d4a8 | 2009-06-08 19:50:45 -0400 | [diff] [blame] | 184 | #ifdef CONFIG_FS_POSIX_ACL |
| 185 | inode->i_acl = inode->i_default_acl = ACL_NOT_CACHED; |
| 186 | #endif |
David Chinner | 2cb1599 | 2008-10-30 17:32:23 +1100 | [diff] [blame] | 187 | |
Eric Paris | 3be25f4 | 2009-05-21 17:01:26 -0400 | [diff] [blame] | 188 | #ifdef CONFIG_FSNOTIFY |
| 189 | inode->i_fsnotify_mask = 0; |
| 190 | #endif |
Jeff Layton | 4a075e3 | 2015-01-16 15:05:54 -0500 | [diff] [blame] | 191 | inode->i_flctx = NULL; |
Nick Piggin | 3e880fb | 2011-01-07 17:49:19 +1100 | [diff] [blame] | 192 | this_cpu_inc(nr_inodes); |
Dave Chinner | cffbc8a | 2010-10-23 05:03:02 -0400 | [diff] [blame] | 193 | |
Christoph Hellwig | 54e3462 | 2009-08-07 14:38:25 -0300 | [diff] [blame] | 194 | return 0; |
Christoph Hellwig | 54e3462 | 2009-08-07 14:38:25 -0300 | [diff] [blame] | 195 | out: |
| 196 | return -ENOMEM; |
David Chinner | 2cb1599 | 2008-10-30 17:32:23 +1100 | [diff] [blame] | 197 | } |
| 198 | EXPORT_SYMBOL(inode_init_always); |
| 199 | |
| 200 | static struct inode *alloc_inode(struct super_block *sb) |
| 201 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | struct inode *inode; |
| 203 | |
| 204 | if (sb->s_op->alloc_inode) |
| 205 | inode = sb->s_op->alloc_inode(sb); |
| 206 | else |
David Chinner | 2cb1599 | 2008-10-30 17:32:23 +1100 | [diff] [blame] | 207 | inode = kmem_cache_alloc(inode_cachep, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 208 | |
Christoph Hellwig | 54e3462 | 2009-08-07 14:38:25 -0300 | [diff] [blame] | 209 | if (!inode) |
| 210 | return NULL; |
| 211 | |
| 212 | if (unlikely(inode_init_always(sb, inode))) { |
| 213 | if (inode->i_sb->s_op->destroy_inode) |
| 214 | inode->i_sb->s_op->destroy_inode(inode); |
| 215 | else |
| 216 | kmem_cache_free(inode_cachep, inode); |
| 217 | return NULL; |
| 218 | } |
| 219 | |
| 220 | return inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 221 | } |
| 222 | |
Nick Piggin | ff0c7d1 | 2011-01-07 17:49:50 +1100 | [diff] [blame] | 223 | void free_inode_nonrcu(struct inode *inode) |
| 224 | { |
| 225 | kmem_cache_free(inode_cachep, inode); |
| 226 | } |
| 227 | EXPORT_SYMBOL(free_inode_nonrcu); |
| 228 | |
Christoph Hellwig | 2e00c97 | 2009-08-07 14:38:29 -0300 | [diff] [blame] | 229 | void __destroy_inode(struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | { |
Eric Sesterhenn | b7542f8 | 2006-04-02 13:38:18 +0200 | [diff] [blame] | 231 | BUG_ON(inode_has_buffers(inode)); |
Tejun Heo | 52ebea7 | 2015-05-22 17:13:37 -0400 | [diff] [blame] | 232 | inode_detach_wb(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | security_inode_free(inode); |
Eric Paris | 3be25f4 | 2009-05-21 17:01:26 -0400 | [diff] [blame] | 234 | fsnotify_inode_delete(inode); |
Jeff Layton | f27a0fe | 2016-01-07 15:08:51 -0500 | [diff] [blame] | 235 | locks_free_lock_context(inode); |
Miklos Szeredi | 7ada4db | 2011-11-21 12:11:32 +0100 | [diff] [blame] | 236 | if (!inode->i_nlink) { |
| 237 | WARN_ON(atomic_long_read(&inode->i_sb->s_remove_count) == 0); |
| 238 | atomic_long_dec(&inode->i_sb->s_remove_count); |
| 239 | } |
| 240 | |
Al Viro | f19d4a8 | 2009-06-08 19:50:45 -0400 | [diff] [blame] | 241 | #ifdef CONFIG_FS_POSIX_ACL |
Andreas Gruenbacher | b8a7a3a | 2016-03-24 14:38:37 +0100 | [diff] [blame] | 242 | if (inode->i_acl && !is_uncached_acl(inode->i_acl)) |
Al Viro | f19d4a8 | 2009-06-08 19:50:45 -0400 | [diff] [blame] | 243 | posix_acl_release(inode->i_acl); |
Andreas Gruenbacher | b8a7a3a | 2016-03-24 14:38:37 +0100 | [diff] [blame] | 244 | if (inode->i_default_acl && !is_uncached_acl(inode->i_default_acl)) |
Al Viro | f19d4a8 | 2009-06-08 19:50:45 -0400 | [diff] [blame] | 245 | posix_acl_release(inode->i_default_acl); |
| 246 | #endif |
Nick Piggin | 3e880fb | 2011-01-07 17:49:19 +1100 | [diff] [blame] | 247 | this_cpu_dec(nr_inodes); |
Christoph Hellwig | 2e00c97 | 2009-08-07 14:38:29 -0300 | [diff] [blame] | 248 | } |
| 249 | EXPORT_SYMBOL(__destroy_inode); |
| 250 | |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 251 | static void i_callback(struct rcu_head *head) |
| 252 | { |
| 253 | struct inode *inode = container_of(head, struct inode, i_rcu); |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 254 | kmem_cache_free(inode_cachep, inode); |
| 255 | } |
| 256 | |
Christoph Hellwig | 56b0dac | 2010-10-06 10:48:55 +0200 | [diff] [blame] | 257 | static void destroy_inode(struct inode *inode) |
Christoph Hellwig | 2e00c97 | 2009-08-07 14:38:29 -0300 | [diff] [blame] | 258 | { |
Nick Piggin | 7ccf19a | 2010-10-21 11:49:30 +1100 | [diff] [blame] | 259 | BUG_ON(!list_empty(&inode->i_lru)); |
Christoph Hellwig | 2e00c97 | 2009-08-07 14:38:29 -0300 | [diff] [blame] | 260 | __destroy_inode(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | if (inode->i_sb->s_op->destroy_inode) |
| 262 | inode->i_sb->s_op->destroy_inode(inode); |
| 263 | else |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 264 | call_rcu(&inode->i_rcu, i_callback); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 265 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 266 | |
Miklos Szeredi | 7ada4db | 2011-11-21 12:11:32 +0100 | [diff] [blame] | 267 | /** |
| 268 | * drop_nlink - directly drop an inode's link count |
| 269 | * @inode: inode |
| 270 | * |
| 271 | * This is a low-level filesystem helper to replace any |
| 272 | * direct filesystem manipulation of i_nlink. In cases |
| 273 | * where we are attempting to track writes to the |
| 274 | * filesystem, a decrement to zero means an imminent |
| 275 | * write when the file is truncated and actually unlinked |
| 276 | * on the filesystem. |
| 277 | */ |
| 278 | void drop_nlink(struct inode *inode) |
| 279 | { |
| 280 | WARN_ON(inode->i_nlink == 0); |
| 281 | inode->__i_nlink--; |
| 282 | if (!inode->i_nlink) |
| 283 | atomic_long_inc(&inode->i_sb->s_remove_count); |
| 284 | } |
| 285 | EXPORT_SYMBOL(drop_nlink); |
| 286 | |
| 287 | /** |
| 288 | * clear_nlink - directly zero an inode's link count |
| 289 | * @inode: inode |
| 290 | * |
| 291 | * This is a low-level filesystem helper to replace any |
| 292 | * direct filesystem manipulation of i_nlink. See |
| 293 | * drop_nlink() for why we care about i_nlink hitting zero. |
| 294 | */ |
| 295 | void clear_nlink(struct inode *inode) |
| 296 | { |
| 297 | if (inode->i_nlink) { |
| 298 | inode->__i_nlink = 0; |
| 299 | atomic_long_inc(&inode->i_sb->s_remove_count); |
| 300 | } |
| 301 | } |
| 302 | EXPORT_SYMBOL(clear_nlink); |
| 303 | |
| 304 | /** |
| 305 | * set_nlink - directly set an inode's link count |
| 306 | * @inode: inode |
| 307 | * @nlink: new nlink (should be non-zero) |
| 308 | * |
| 309 | * This is a low-level filesystem helper to replace any |
| 310 | * direct filesystem manipulation of i_nlink. |
| 311 | */ |
| 312 | void set_nlink(struct inode *inode, unsigned int nlink) |
| 313 | { |
| 314 | if (!nlink) { |
Miklos Szeredi | 7ada4db | 2011-11-21 12:11:32 +0100 | [diff] [blame] | 315 | clear_nlink(inode); |
| 316 | } else { |
| 317 | /* Yes, some filesystems do change nlink from zero to one */ |
| 318 | if (inode->i_nlink == 0) |
| 319 | atomic_long_dec(&inode->i_sb->s_remove_count); |
| 320 | |
| 321 | inode->__i_nlink = nlink; |
| 322 | } |
| 323 | } |
| 324 | EXPORT_SYMBOL(set_nlink); |
| 325 | |
| 326 | /** |
| 327 | * inc_nlink - directly increment an inode's link count |
| 328 | * @inode: inode |
| 329 | * |
| 330 | * This is a low-level filesystem helper to replace any |
| 331 | * direct filesystem manipulation of i_nlink. Currently, |
| 332 | * it is only here for parity with dec_nlink(). |
| 333 | */ |
| 334 | void inc_nlink(struct inode *inode) |
| 335 | { |
Al Viro | f4e0c30 | 2013-06-11 08:34:36 +0400 | [diff] [blame] | 336 | if (unlikely(inode->i_nlink == 0)) { |
| 337 | WARN_ON(!(inode->i_state & I_LINKABLE)); |
Miklos Szeredi | 7ada4db | 2011-11-21 12:11:32 +0100 | [diff] [blame] | 338 | atomic_long_dec(&inode->i_sb->s_remove_count); |
Al Viro | f4e0c30 | 2013-06-11 08:34:36 +0400 | [diff] [blame] | 339 | } |
Miklos Szeredi | 7ada4db | 2011-11-21 12:11:32 +0100 | [diff] [blame] | 340 | |
| 341 | inode->__i_nlink++; |
| 342 | } |
| 343 | EXPORT_SYMBOL(inc_nlink); |
| 344 | |
Miklos Szeredi | 2aa1589 | 2011-02-23 13:49:47 +0100 | [diff] [blame] | 345 | void address_space_init_once(struct address_space *mapping) |
| 346 | { |
| 347 | memset(mapping, 0, sizeof(*mapping)); |
| 348 | INIT_RADIX_TREE(&mapping->page_tree, GFP_ATOMIC); |
| 349 | spin_lock_init(&mapping->tree_lock); |
Davidlohr Bueso | c8c06ef | 2014-12-12 16:54:24 -0800 | [diff] [blame] | 350 | init_rwsem(&mapping->i_mmap_rwsem); |
Miklos Szeredi | 2aa1589 | 2011-02-23 13:49:47 +0100 | [diff] [blame] | 351 | INIT_LIST_HEAD(&mapping->private_list); |
| 352 | spin_lock_init(&mapping->private_lock); |
Michel Lespinasse | 6b2dbba | 2012-10-08 16:31:25 -0700 | [diff] [blame] | 353 | mapping->i_mmap = RB_ROOT; |
Miklos Szeredi | 2aa1589 | 2011-02-23 13:49:47 +0100 | [diff] [blame] | 354 | } |
| 355 | EXPORT_SYMBOL(address_space_init_once); |
| 356 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | /* |
| 358 | * These are initializations that only need to be done |
| 359 | * once, because the fields are idempotent across use |
| 360 | * of the inode, so let the slab aware of that. |
| 361 | */ |
| 362 | void inode_init_once(struct inode *inode) |
| 363 | { |
| 364 | memset(inode, 0, sizeof(*inode)); |
| 365 | INIT_HLIST_NODE(&inode->i_hash); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | INIT_LIST_HEAD(&inode->i_devices); |
Dave Chinner | c7f5408 | 2015-03-04 14:07:22 -0500 | [diff] [blame] | 367 | INIT_LIST_HEAD(&inode->i_io_list); |
Dave Chinner | 6c60d2b | 2016-07-26 15:21:50 -0700 | [diff] [blame] | 368 | INIT_LIST_HEAD(&inode->i_wb_list); |
Nick Piggin | 7ccf19a | 2010-10-21 11:49:30 +1100 | [diff] [blame] | 369 | INIT_LIST_HEAD(&inode->i_lru); |
Miklos Szeredi | 2aa1589 | 2011-02-23 13:49:47 +0100 | [diff] [blame] | 370 | address_space_init_once(&inode->i_data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | i_size_ordered_init(inode); |
Eric Paris | 3be25f4 | 2009-05-21 17:01:26 -0400 | [diff] [blame] | 372 | #ifdef CONFIG_FSNOTIFY |
Eric Paris | e61ce86 | 2009-12-17 21:24:24 -0500 | [diff] [blame] | 373 | INIT_HLIST_HEAD(&inode->i_fsnotify_marks); |
Eric Paris | 3be25f4 | 2009-05-21 17:01:26 -0400 | [diff] [blame] | 374 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 375 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | EXPORT_SYMBOL(inode_init_once); |
| 377 | |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 378 | static void init_once(void *foo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | { |
Manish Katiyar | 6b3304b | 2009-03-31 19:35:54 +0530 | [diff] [blame] | 380 | struct inode *inode = (struct inode *) foo; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | |
Christoph Lameter | a35afb8 | 2007-05-16 22:10:57 -0700 | [diff] [blame] | 382 | inode_init_once(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | } |
| 384 | |
| 385 | /* |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 386 | * inode->i_lock must be held |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | */ |
Manish Katiyar | 6b3304b | 2009-03-31 19:35:54 +0530 | [diff] [blame] | 388 | void __iget(struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | { |
Nick Piggin | 9e38d86 | 2010-10-23 06:55:17 -0400 | [diff] [blame] | 390 | atomic_inc(&inode->i_count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 391 | } |
| 392 | |
Al Viro | 7de9c6ee | 2010-10-23 11:11:40 -0400 | [diff] [blame] | 393 | /* |
| 394 | * get additional reference to inode; caller must already hold one. |
| 395 | */ |
| 396 | void ihold(struct inode *inode) |
| 397 | { |
| 398 | WARN_ON(atomic_inc_return(&inode->i_count) < 2); |
| 399 | } |
| 400 | EXPORT_SYMBOL(ihold); |
| 401 | |
Nick Piggin | 9e38d86 | 2010-10-23 06:55:17 -0400 | [diff] [blame] | 402 | static void inode_lru_list_add(struct inode *inode) |
| 403 | { |
Dave Chinner | bc3b14c | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 404 | if (list_lru_add(&inode->i_sb->s_inode_lru, &inode->i_lru)) |
Dave Chinner | fcb94f7 | 2011-07-08 14:14:38 +1000 | [diff] [blame] | 405 | this_cpu_inc(nr_unused); |
Nick Piggin | 9e38d86 | 2010-10-23 06:55:17 -0400 | [diff] [blame] | 406 | } |
| 407 | |
Jan Kara | 4eff96d | 2012-11-26 16:29:51 -0800 | [diff] [blame] | 408 | /* |
| 409 | * Add inode to LRU if needed (inode is unused and clean). |
| 410 | * |
| 411 | * Needs inode->i_lock held. |
| 412 | */ |
| 413 | void inode_add_lru(struct inode *inode) |
| 414 | { |
Theodore Ts'o | 0ae45f6 | 2015-02-02 00:37:00 -0500 | [diff] [blame] | 415 | if (!(inode->i_state & (I_DIRTY_ALL | I_SYNC | |
| 416 | I_FREEING | I_WILL_FREE)) && |
Jan Kara | 4eff96d | 2012-11-26 16:29:51 -0800 | [diff] [blame] | 417 | !atomic_read(&inode->i_count) && inode->i_sb->s_flags & MS_ACTIVE) |
| 418 | inode_lru_list_add(inode); |
| 419 | } |
| 420 | |
| 421 | |
Nick Piggin | 9e38d86 | 2010-10-23 06:55:17 -0400 | [diff] [blame] | 422 | static void inode_lru_list_del(struct inode *inode) |
| 423 | { |
Dave Chinner | bc3b14c | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 424 | |
| 425 | if (list_lru_del(&inode->i_sb->s_inode_lru, &inode->i_lru)) |
Dave Chinner | fcb94f7 | 2011-07-08 14:14:38 +1000 | [diff] [blame] | 426 | this_cpu_dec(nr_unused); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 427 | } |
| 428 | |
Christoph Hellwig | 646ec46 | 2010-10-23 07:15:32 -0400 | [diff] [blame] | 429 | /** |
| 430 | * inode_sb_list_add - add inode to the superblock list of inodes |
| 431 | * @inode: inode to add |
| 432 | */ |
| 433 | void inode_sb_list_add(struct inode *inode) |
| 434 | { |
Dave Chinner | 74278da | 2015-03-04 12:37:22 -0500 | [diff] [blame] | 435 | spin_lock(&inode->i_sb->s_inode_list_lock); |
Dave Chinner | 55fa609 | 2011-03-22 22:23:40 +1100 | [diff] [blame] | 436 | list_add(&inode->i_sb_list, &inode->i_sb->s_inodes); |
Dave Chinner | 74278da | 2015-03-04 12:37:22 -0500 | [diff] [blame] | 437 | spin_unlock(&inode->i_sb->s_inode_list_lock); |
Christoph Hellwig | 646ec46 | 2010-10-23 07:15:32 -0400 | [diff] [blame] | 438 | } |
| 439 | EXPORT_SYMBOL_GPL(inode_sb_list_add); |
| 440 | |
Dave Chinner | 55fa609 | 2011-03-22 22:23:40 +1100 | [diff] [blame] | 441 | static inline void inode_sb_list_del(struct inode *inode) |
Christoph Hellwig | 646ec46 | 2010-10-23 07:15:32 -0400 | [diff] [blame] | 442 | { |
Eric Dumazet | a209dfc | 2011-07-26 11:36:34 +0200 | [diff] [blame] | 443 | if (!list_empty(&inode->i_sb_list)) { |
Dave Chinner | 74278da | 2015-03-04 12:37:22 -0500 | [diff] [blame] | 444 | spin_lock(&inode->i_sb->s_inode_list_lock); |
Eric Dumazet | a209dfc | 2011-07-26 11:36:34 +0200 | [diff] [blame] | 445 | list_del_init(&inode->i_sb_list); |
Dave Chinner | 74278da | 2015-03-04 12:37:22 -0500 | [diff] [blame] | 446 | spin_unlock(&inode->i_sb->s_inode_list_lock); |
Eric Dumazet | a209dfc | 2011-07-26 11:36:34 +0200 | [diff] [blame] | 447 | } |
Christoph Hellwig | 646ec46 | 2010-10-23 07:15:32 -0400 | [diff] [blame] | 448 | } |
| 449 | |
Dave Chinner | 4c51acb | 2010-10-23 06:58:09 -0400 | [diff] [blame] | 450 | static unsigned long hash(struct super_block *sb, unsigned long hashval) |
| 451 | { |
| 452 | unsigned long tmp; |
| 453 | |
| 454 | tmp = (hashval * (unsigned long)sb) ^ (GOLDEN_RATIO_PRIME + hashval) / |
| 455 | L1_CACHE_BYTES; |
Christoph Hellwig | 4b4563d | 2011-05-27 09:28:01 -0400 | [diff] [blame] | 456 | tmp = tmp ^ ((tmp ^ GOLDEN_RATIO_PRIME) >> i_hash_shift); |
| 457 | return tmp & i_hash_mask; |
Dave Chinner | 4c51acb | 2010-10-23 06:58:09 -0400 | [diff] [blame] | 458 | } |
| 459 | |
| 460 | /** |
| 461 | * __insert_inode_hash - hash an inode |
| 462 | * @inode: unhashed inode |
| 463 | * @hashval: unsigned long value used to locate this object in the |
| 464 | * inode_hashtable. |
| 465 | * |
| 466 | * Add an inode to the inode hash for this superblock. |
| 467 | */ |
| 468 | void __insert_inode_hash(struct inode *inode, unsigned long hashval) |
| 469 | { |
Christoph Hellwig | 646ec46 | 2010-10-23 07:15:32 -0400 | [diff] [blame] | 470 | struct hlist_head *b = inode_hashtable + hash(inode->i_sb, hashval); |
| 471 | |
Dave Chinner | 67a23c4 | 2011-03-22 22:23:42 +1100 | [diff] [blame] | 472 | spin_lock(&inode_hash_lock); |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 473 | spin_lock(&inode->i_lock); |
Christoph Hellwig | 646ec46 | 2010-10-23 07:15:32 -0400 | [diff] [blame] | 474 | hlist_add_head(&inode->i_hash, b); |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 475 | spin_unlock(&inode->i_lock); |
Dave Chinner | 67a23c4 | 2011-03-22 22:23:42 +1100 | [diff] [blame] | 476 | spin_unlock(&inode_hash_lock); |
Dave Chinner | 4c51acb | 2010-10-23 06:58:09 -0400 | [diff] [blame] | 477 | } |
| 478 | EXPORT_SYMBOL(__insert_inode_hash); |
| 479 | |
| 480 | /** |
Eric Dumazet | f2ee7ab | 2011-07-28 06:41:09 +0200 | [diff] [blame] | 481 | * __remove_inode_hash - remove an inode from the hash |
Dave Chinner | 4c51acb | 2010-10-23 06:58:09 -0400 | [diff] [blame] | 482 | * @inode: inode to unhash |
| 483 | * |
| 484 | * Remove an inode from the superblock. |
| 485 | */ |
Eric Dumazet | f2ee7ab | 2011-07-28 06:41:09 +0200 | [diff] [blame] | 486 | void __remove_inode_hash(struct inode *inode) |
Dave Chinner | 4c51acb | 2010-10-23 06:58:09 -0400 | [diff] [blame] | 487 | { |
Dave Chinner | 67a23c4 | 2011-03-22 22:23:42 +1100 | [diff] [blame] | 488 | spin_lock(&inode_hash_lock); |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 489 | spin_lock(&inode->i_lock); |
Dave Chinner | 4c51acb | 2010-10-23 06:58:09 -0400 | [diff] [blame] | 490 | hlist_del_init(&inode->i_hash); |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 491 | spin_unlock(&inode->i_lock); |
Dave Chinner | 67a23c4 | 2011-03-22 22:23:42 +1100 | [diff] [blame] | 492 | spin_unlock(&inode_hash_lock); |
Dave Chinner | 4c51acb | 2010-10-23 06:58:09 -0400 | [diff] [blame] | 493 | } |
Eric Dumazet | f2ee7ab | 2011-07-28 06:41:09 +0200 | [diff] [blame] | 494 | EXPORT_SYMBOL(__remove_inode_hash); |
Dave Chinner | 4c51acb | 2010-10-23 06:58:09 -0400 | [diff] [blame] | 495 | |
Jan Kara | dbd5768 | 2012-05-03 14:48:02 +0200 | [diff] [blame] | 496 | void clear_inode(struct inode *inode) |
Al Viro | b0683aa | 2010-06-04 20:55:25 -0400 | [diff] [blame] | 497 | { |
| 498 | might_sleep(); |
Jan Kara | 0814257 | 2011-06-27 16:18:10 -0700 | [diff] [blame] | 499 | /* |
| 500 | * We have to cycle tree_lock here because reclaim can be still in the |
| 501 | * process of removing the last page (in __delete_from_page_cache()) |
| 502 | * and we must not free mapping under it. |
| 503 | */ |
| 504 | spin_lock_irq(&inode->i_data.tree_lock); |
Al Viro | b0683aa | 2010-06-04 20:55:25 -0400 | [diff] [blame] | 505 | BUG_ON(inode->i_data.nrpages); |
Ross Zwisler | f9fe48b | 2016-01-22 15:10:40 -0800 | [diff] [blame] | 506 | BUG_ON(inode->i_data.nrexceptional); |
Jan Kara | 0814257 | 2011-06-27 16:18:10 -0700 | [diff] [blame] | 507 | spin_unlock_irq(&inode->i_data.tree_lock); |
Al Viro | b0683aa | 2010-06-04 20:55:25 -0400 | [diff] [blame] | 508 | BUG_ON(!list_empty(&inode->i_data.private_list)); |
| 509 | BUG_ON(!(inode->i_state & I_FREEING)); |
| 510 | BUG_ON(inode->i_state & I_CLEAR); |
Dave Chinner | 6c60d2b | 2016-07-26 15:21:50 -0700 | [diff] [blame] | 511 | BUG_ON(!list_empty(&inode->i_wb_list)); |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 512 | /* don't need i_lock here, no concurrent mods to i_state */ |
Al Viro | b0683aa | 2010-06-04 20:55:25 -0400 | [diff] [blame] | 513 | inode->i_state = I_FREEING | I_CLEAR; |
| 514 | } |
Jan Kara | dbd5768 | 2012-05-03 14:48:02 +0200 | [diff] [blame] | 515 | EXPORT_SYMBOL(clear_inode); |
Al Viro | b0683aa | 2010-06-04 20:55:25 -0400 | [diff] [blame] | 516 | |
Dave Chinner | b2b2af8 | 2011-03-22 22:23:37 +1100 | [diff] [blame] | 517 | /* |
| 518 | * Free the inode passed in, removing it from the lists it is still connected |
| 519 | * to. We remove any pages still attached to the inode and wait for any IO that |
| 520 | * is still in progress before finally destroying the inode. |
| 521 | * |
| 522 | * An inode must already be marked I_FREEING so that we avoid the inode being |
| 523 | * moved back onto lists if we race with other code that manipulates the lists |
| 524 | * (e.g. writeback_single_inode). The caller is responsible for setting this. |
| 525 | * |
| 526 | * An inode must already be removed from the LRU list before being evicted from |
| 527 | * the cache. This should occur atomically with setting the I_FREEING state |
| 528 | * flag, so no inodes here should ever be on the LRU when being evicted. |
| 529 | */ |
Al Viro | 644da59 | 2010-06-07 13:21:05 -0400 | [diff] [blame] | 530 | static void evict(struct inode *inode) |
Al Viro | b4272d4 | 2010-06-04 19:33:20 -0400 | [diff] [blame] | 531 | { |
| 532 | const struct super_operations *op = inode->i_sb->s_op; |
| 533 | |
Dave Chinner | b2b2af8 | 2011-03-22 22:23:37 +1100 | [diff] [blame] | 534 | BUG_ON(!(inode->i_state & I_FREEING)); |
| 535 | BUG_ON(!list_empty(&inode->i_lru)); |
| 536 | |
Dave Chinner | c7f5408 | 2015-03-04 14:07:22 -0500 | [diff] [blame] | 537 | if (!list_empty(&inode->i_io_list)) |
| 538 | inode_io_list_del(inode); |
Eric Dumazet | b12362b | 2011-07-28 06:11:47 +0200 | [diff] [blame] | 539 | |
Dave Chinner | 55fa609 | 2011-03-22 22:23:40 +1100 | [diff] [blame] | 540 | inode_sb_list_del(inode); |
| 541 | |
Jan Kara | 169ebd9 | 2012-05-03 14:48:03 +0200 | [diff] [blame] | 542 | /* |
| 543 | * Wait for flusher thread to be done with the inode so that filesystem |
| 544 | * does not start destroying it while writeback is still running. Since |
| 545 | * the inode has I_FREEING set, flusher thread won't start new work on |
| 546 | * the inode. We just have to wait for running writeback to finish. |
| 547 | */ |
| 548 | inode_wait_for_writeback(inode); |
Jan Kara | 7994e6f | 2012-05-03 14:48:01 +0200 | [diff] [blame] | 549 | |
Al Viro | be7ce41 | 2010-06-04 19:40:39 -0400 | [diff] [blame] | 550 | if (op->evict_inode) { |
| 551 | op->evict_inode(inode); |
Al Viro | b4272d4 | 2010-06-04 19:33:20 -0400 | [diff] [blame] | 552 | } else { |
Johannes Weiner | 91b0abe | 2014-04-03 14:47:49 -0700 | [diff] [blame] | 553 | truncate_inode_pages_final(&inode->i_data); |
Jan Kara | dbd5768 | 2012-05-03 14:48:02 +0200 | [diff] [blame] | 554 | clear_inode(inode); |
Al Viro | b4272d4 | 2010-06-04 19:33:20 -0400 | [diff] [blame] | 555 | } |
Al Viro | 661074e | 2010-06-04 20:19:55 -0400 | [diff] [blame] | 556 | if (S_ISBLK(inode->i_mode) && inode->i_bdev) |
| 557 | bd_forget(inode); |
| 558 | if (S_ISCHR(inode->i_mode) && inode->i_cdev) |
| 559 | cd_forget(inode); |
Dave Chinner | b2b2af8 | 2011-03-22 22:23:37 +1100 | [diff] [blame] | 560 | |
| 561 | remove_inode_hash(inode); |
| 562 | |
| 563 | spin_lock(&inode->i_lock); |
| 564 | wake_up_bit(&inode->i_state, __I_NEW); |
| 565 | BUG_ON(inode->i_state != (I_FREEING | I_CLEAR)); |
| 566 | spin_unlock(&inode->i_lock); |
| 567 | |
| 568 | destroy_inode(inode); |
Al Viro | b4272d4 | 2010-06-04 19:33:20 -0400 | [diff] [blame] | 569 | } |
| 570 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | /* |
| 572 | * dispose_list - dispose of the contents of a local list |
| 573 | * @head: the head of the list to free |
| 574 | * |
| 575 | * Dispose-list gets a local list with local inodes in it, so it doesn't |
| 576 | * need to worry about list corruption and SMP locks. |
| 577 | */ |
| 578 | static void dispose_list(struct list_head *head) |
| 579 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 580 | while (!list_empty(head)) { |
| 581 | struct inode *inode; |
| 582 | |
Nick Piggin | 7ccf19a | 2010-10-21 11:49:30 +1100 | [diff] [blame] | 583 | inode = list_first_entry(head, struct inode, i_lru); |
| 584 | list_del_init(&inode->i_lru); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 585 | |
Al Viro | 644da59 | 2010-06-07 13:21:05 -0400 | [diff] [blame] | 586 | evict(inode); |
Josef Bacik | ac05fbb | 2015-03-04 16:52:52 -0500 | [diff] [blame] | 587 | cond_resched(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | } |
| 590 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | /** |
Al Viro | 63997e9 | 2010-10-25 20:49:35 -0400 | [diff] [blame] | 592 | * evict_inodes - evict all evictable inodes for a superblock |
| 593 | * @sb: superblock to operate on |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | * |
Al Viro | 63997e9 | 2010-10-25 20:49:35 -0400 | [diff] [blame] | 595 | * Make sure that no inodes with zero refcount are retained. This is |
| 596 | * called by superblock shutdown after having MS_ACTIVE flag removed, |
| 597 | * so any inode reaching zero refcount during or after that call will |
| 598 | * be immediately evicted. |
| 599 | */ |
| 600 | void evict_inodes(struct super_block *sb) |
| 601 | { |
| 602 | struct inode *inode, *next; |
| 603 | LIST_HEAD(dispose); |
| 604 | |
Josef Bacik | ac05fbb | 2015-03-04 16:52:52 -0500 | [diff] [blame] | 605 | again: |
Dave Chinner | 74278da | 2015-03-04 12:37:22 -0500 | [diff] [blame] | 606 | spin_lock(&sb->s_inode_list_lock); |
Al Viro | 63997e9 | 2010-10-25 20:49:35 -0400 | [diff] [blame] | 607 | list_for_each_entry_safe(inode, next, &sb->s_inodes, i_sb_list) { |
| 608 | if (atomic_read(&inode->i_count)) |
| 609 | continue; |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 610 | |
| 611 | spin_lock(&inode->i_lock); |
| 612 | if (inode->i_state & (I_NEW | I_FREEING | I_WILL_FREE)) { |
| 613 | spin_unlock(&inode->i_lock); |
Al Viro | 63997e9 | 2010-10-25 20:49:35 -0400 | [diff] [blame] | 614 | continue; |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 615 | } |
Al Viro | 63997e9 | 2010-10-25 20:49:35 -0400 | [diff] [blame] | 616 | |
| 617 | inode->i_state |= I_FREEING; |
Dave Chinner | 02afc41 | 2011-03-22 22:23:38 +1100 | [diff] [blame] | 618 | inode_lru_list_del(inode); |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 619 | spin_unlock(&inode->i_lock); |
Dave Chinner | 02afc41 | 2011-03-22 22:23:38 +1100 | [diff] [blame] | 620 | list_add(&inode->i_lru, &dispose); |
Josef Bacik | ac05fbb | 2015-03-04 16:52:52 -0500 | [diff] [blame] | 621 | |
| 622 | /* |
| 623 | * We can have a ton of inodes to evict at unmount time given |
| 624 | * enough memory, check to see if we need to go to sleep for a |
| 625 | * bit so we don't livelock. |
| 626 | */ |
| 627 | if (need_resched()) { |
| 628 | spin_unlock(&sb->s_inode_list_lock); |
| 629 | cond_resched(); |
| 630 | dispose_list(&dispose); |
| 631 | goto again; |
| 632 | } |
Al Viro | 63997e9 | 2010-10-25 20:49:35 -0400 | [diff] [blame] | 633 | } |
Dave Chinner | 74278da | 2015-03-04 12:37:22 -0500 | [diff] [blame] | 634 | spin_unlock(&sb->s_inode_list_lock); |
Al Viro | 63997e9 | 2010-10-25 20:49:35 -0400 | [diff] [blame] | 635 | |
| 636 | dispose_list(&dispose); |
Al Viro | 63997e9 | 2010-10-25 20:49:35 -0400 | [diff] [blame] | 637 | } |
| 638 | |
| 639 | /** |
Christoph Hellwig | a031878 | 2010-10-24 19:40:33 +0200 | [diff] [blame] | 640 | * invalidate_inodes - attempt to free all inodes on a superblock |
| 641 | * @sb: superblock to operate on |
NeilBrown | 93b270f | 2011-02-24 17:25:47 +1100 | [diff] [blame] | 642 | * @kill_dirty: flag to guide handling of dirty inodes |
Christoph Hellwig | a031878 | 2010-10-24 19:40:33 +0200 | [diff] [blame] | 643 | * |
| 644 | * Attempts to free all inodes for a given superblock. If there were any |
| 645 | * busy inodes return a non-zero value, else zero. |
NeilBrown | 93b270f | 2011-02-24 17:25:47 +1100 | [diff] [blame] | 646 | * If @kill_dirty is set, discard dirty inodes too, otherwise treat |
| 647 | * them as busy. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 648 | */ |
NeilBrown | 93b270f | 2011-02-24 17:25:47 +1100 | [diff] [blame] | 649 | int invalidate_inodes(struct super_block *sb, bool kill_dirty) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | { |
Dave Chinner | cffbc8a | 2010-10-23 05:03:02 -0400 | [diff] [blame] | 651 | int busy = 0; |
Christoph Hellwig | a031878 | 2010-10-24 19:40:33 +0200 | [diff] [blame] | 652 | struct inode *inode, *next; |
| 653 | LIST_HEAD(dispose); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 654 | |
Dave Chinner | 74278da | 2015-03-04 12:37:22 -0500 | [diff] [blame] | 655 | spin_lock(&sb->s_inode_list_lock); |
Christoph Hellwig | a031878 | 2010-10-24 19:40:33 +0200 | [diff] [blame] | 656 | list_for_each_entry_safe(inode, next, &sb->s_inodes, i_sb_list) { |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 657 | spin_lock(&inode->i_lock); |
| 658 | if (inode->i_state & (I_NEW | I_FREEING | I_WILL_FREE)) { |
| 659 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | continue; |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 661 | } |
Theodore Ts'o | 0ae45f6 | 2015-02-02 00:37:00 -0500 | [diff] [blame] | 662 | if (inode->i_state & I_DIRTY_ALL && !kill_dirty) { |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 663 | spin_unlock(&inode->i_lock); |
NeilBrown | 93b270f | 2011-02-24 17:25:47 +1100 | [diff] [blame] | 664 | busy = 1; |
| 665 | continue; |
| 666 | } |
Christoph Hellwig | 99a3891 | 2010-10-23 19:07:20 +0200 | [diff] [blame] | 667 | if (atomic_read(&inode->i_count)) { |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 668 | spin_unlock(&inode->i_lock); |
Christoph Hellwig | 99a3891 | 2010-10-23 19:07:20 +0200 | [diff] [blame] | 669 | busy = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 670 | continue; |
| 671 | } |
Christoph Hellwig | 99a3891 | 2010-10-23 19:07:20 +0200 | [diff] [blame] | 672 | |
Christoph Hellwig | 99a3891 | 2010-10-23 19:07:20 +0200 | [diff] [blame] | 673 | inode->i_state |= I_FREEING; |
Dave Chinner | 02afc41 | 2011-03-22 22:23:38 +1100 | [diff] [blame] | 674 | inode_lru_list_del(inode); |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 675 | spin_unlock(&inode->i_lock); |
Dave Chinner | 02afc41 | 2011-03-22 22:23:38 +1100 | [diff] [blame] | 676 | list_add(&inode->i_lru, &dispose); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 677 | } |
Dave Chinner | 74278da | 2015-03-04 12:37:22 -0500 | [diff] [blame] | 678 | spin_unlock(&sb->s_inode_list_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 679 | |
Christoph Hellwig | a031878 | 2010-10-24 19:40:33 +0200 | [diff] [blame] | 680 | dispose_list(&dispose); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | |
| 682 | return busy; |
| 683 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 684 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | /* |
Dave Chinner | bc3b14c | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 686 | * Isolate the inode from the LRU in preparation for freeing it. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 687 | * |
| 688 | * Any inodes which are pinned purely because of attached pagecache have their |
Nick Piggin | 9e38d86 | 2010-10-23 06:55:17 -0400 | [diff] [blame] | 689 | * pagecache removed. If the inode has metadata buffers attached to |
| 690 | * mapping->private_list then try to remove them. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | * |
Nick Piggin | 9e38d86 | 2010-10-23 06:55:17 -0400 | [diff] [blame] | 692 | * If the inode has the I_REFERENCED flag set, then it means that it has been |
| 693 | * used recently - the flag is set in iput_final(). When we encounter such an |
| 694 | * inode, clear the flag and move it to the back of the LRU so it gets another |
| 695 | * pass through the LRU before it gets reclaimed. This is necessary because of |
| 696 | * the fact we are doing lazy LRU updates to minimise lock contention so the |
| 697 | * LRU does not have strict ordering. Hence we don't want to reclaim inodes |
| 698 | * with this flag set because they are the inodes that are out of order. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | */ |
Vladimir Davydov | 3f97b16 | 2015-02-12 14:59:35 -0800 | [diff] [blame] | 700 | static enum lru_status inode_lru_isolate(struct list_head *item, |
| 701 | struct list_lru_one *lru, spinlock_t *lru_lock, void *arg) |
Dave Chinner | bc3b14c | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 702 | { |
| 703 | struct list_head *freeable = arg; |
| 704 | struct inode *inode = container_of(item, struct inode, i_lru); |
| 705 | |
| 706 | /* |
| 707 | * we are inverting the lru lock/inode->i_lock here, so use a trylock. |
| 708 | * If we fail to get the lock, just skip it. |
| 709 | */ |
| 710 | if (!spin_trylock(&inode->i_lock)) |
| 711 | return LRU_SKIP; |
| 712 | |
| 713 | /* |
| 714 | * Referenced or dirty inodes are still in use. Give them another pass |
| 715 | * through the LRU as we canot reclaim them now. |
| 716 | */ |
| 717 | if (atomic_read(&inode->i_count) || |
| 718 | (inode->i_state & ~I_REFERENCED)) { |
Vladimir Davydov | 3f97b16 | 2015-02-12 14:59:35 -0800 | [diff] [blame] | 719 | list_lru_isolate(lru, &inode->i_lru); |
Dave Chinner | bc3b14c | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 720 | spin_unlock(&inode->i_lock); |
| 721 | this_cpu_dec(nr_unused); |
| 722 | return LRU_REMOVED; |
| 723 | } |
| 724 | |
| 725 | /* recently referenced inodes get one more pass */ |
| 726 | if (inode->i_state & I_REFERENCED) { |
| 727 | inode->i_state &= ~I_REFERENCED; |
| 728 | spin_unlock(&inode->i_lock); |
| 729 | return LRU_ROTATE; |
| 730 | } |
| 731 | |
| 732 | if (inode_has_buffers(inode) || inode->i_data.nrpages) { |
| 733 | __iget(inode); |
| 734 | spin_unlock(&inode->i_lock); |
| 735 | spin_unlock(lru_lock); |
| 736 | if (remove_inode_buffers(inode)) { |
| 737 | unsigned long reap; |
| 738 | reap = invalidate_mapping_pages(&inode->i_data, 0, -1); |
| 739 | if (current_is_kswapd()) |
| 740 | __count_vm_events(KSWAPD_INODESTEAL, reap); |
| 741 | else |
| 742 | __count_vm_events(PGINODESTEAL, reap); |
| 743 | if (current->reclaim_state) |
| 744 | current->reclaim_state->reclaimed_slab += reap; |
| 745 | } |
| 746 | iput(inode); |
| 747 | spin_lock(lru_lock); |
| 748 | return LRU_RETRY; |
| 749 | } |
| 750 | |
| 751 | WARN_ON(inode->i_state & I_NEW); |
| 752 | inode->i_state |= I_FREEING; |
Vladimir Davydov | 3f97b16 | 2015-02-12 14:59:35 -0800 | [diff] [blame] | 753 | list_lru_isolate_move(lru, &inode->i_lru, freeable); |
Dave Chinner | bc3b14c | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 754 | spin_unlock(&inode->i_lock); |
| 755 | |
Dave Chinner | bc3b14c | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 756 | this_cpu_dec(nr_unused); |
| 757 | return LRU_REMOVED; |
| 758 | } |
| 759 | |
| 760 | /* |
| 761 | * Walk the superblock inode LRU for freeable inodes and attempt to free them. |
| 762 | * This is called from the superblock shrinker function with a number of inodes |
| 763 | * to trim from the LRU. Inodes to be freed are moved to a temporary list and |
| 764 | * then are freed outside inode_lock by dispose_list(). |
| 765 | */ |
Vladimir Davydov | 503c358 | 2015-02-12 14:58:47 -0800 | [diff] [blame] | 766 | long prune_icache_sb(struct super_block *sb, struct shrink_control *sc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | { |
| 768 | LIST_HEAD(freeable); |
Dave Chinner | bc3b14c | 2013-08-28 10:17:58 +1000 | [diff] [blame] | 769 | long freed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | |
Vladimir Davydov | 503c358 | 2015-02-12 14:58:47 -0800 | [diff] [blame] | 771 | freed = list_lru_shrink_walk(&sb->s_inode_lru, sc, |
| 772 | inode_lru_isolate, &freeable); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | dispose_list(&freeable); |
Dave Chinner | 0a234c6 | 2013-08-28 10:17:57 +1000 | [diff] [blame] | 774 | return freed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 775 | } |
| 776 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | static void __wait_on_freeing_inode(struct inode *inode); |
| 778 | /* |
| 779 | * Called with the inode lock held. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | */ |
Manish Katiyar | 6b3304b | 2009-03-31 19:35:54 +0530 | [diff] [blame] | 781 | static struct inode *find_inode(struct super_block *sb, |
| 782 | struct hlist_head *head, |
| 783 | int (*test)(struct inode *, void *), |
| 784 | void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | { |
Manish Katiyar | 6b3304b | 2009-03-31 19:35:54 +0530 | [diff] [blame] | 786 | struct inode *inode = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 787 | |
| 788 | repeat: |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 789 | hlist_for_each_entry(inode, head, i_hash) { |
Al Viro | 5a3cd9928 | 2013-11-06 09:54:52 -0500 | [diff] [blame] | 790 | if (inode->i_sb != sb) |
| 791 | continue; |
| 792 | if (!test(inode, data)) |
| 793 | continue; |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 794 | spin_lock(&inode->i_lock); |
Al Viro | a4ffdde | 2010-06-02 17:38:30 -0400 | [diff] [blame] | 795 | if (inode->i_state & (I_FREEING|I_WILL_FREE)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 796 | __wait_on_freeing_inode(inode); |
| 797 | goto repeat; |
| 798 | } |
Christoph Hellwig | f7899bd | 2010-10-23 07:09:06 -0400 | [diff] [blame] | 799 | __iget(inode); |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 800 | spin_unlock(&inode->i_lock); |
Christoph Hellwig | f7899bd | 2010-10-23 07:09:06 -0400 | [diff] [blame] | 801 | return inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 802 | } |
Christoph Hellwig | f7899bd | 2010-10-23 07:09:06 -0400 | [diff] [blame] | 803 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 804 | } |
| 805 | |
| 806 | /* |
| 807 | * find_inode_fast is the fast path version of find_inode, see the comment at |
| 808 | * iget_locked for details. |
| 809 | */ |
Manish Katiyar | 6b3304b | 2009-03-31 19:35:54 +0530 | [diff] [blame] | 810 | static struct inode *find_inode_fast(struct super_block *sb, |
| 811 | struct hlist_head *head, unsigned long ino) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 812 | { |
Manish Katiyar | 6b3304b | 2009-03-31 19:35:54 +0530 | [diff] [blame] | 813 | struct inode *inode = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 814 | |
| 815 | repeat: |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 816 | hlist_for_each_entry(inode, head, i_hash) { |
Al Viro | 5a3cd9928 | 2013-11-06 09:54:52 -0500 | [diff] [blame] | 817 | if (inode->i_ino != ino) |
| 818 | continue; |
| 819 | if (inode->i_sb != sb) |
| 820 | continue; |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 821 | spin_lock(&inode->i_lock); |
Al Viro | a4ffdde | 2010-06-02 17:38:30 -0400 | [diff] [blame] | 822 | if (inode->i_state & (I_FREEING|I_WILL_FREE)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 823 | __wait_on_freeing_inode(inode); |
| 824 | goto repeat; |
| 825 | } |
Christoph Hellwig | f7899bd | 2010-10-23 07:09:06 -0400 | [diff] [blame] | 826 | __iget(inode); |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 827 | spin_unlock(&inode->i_lock); |
Christoph Hellwig | f7899bd | 2010-10-23 07:09:06 -0400 | [diff] [blame] | 828 | return inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 829 | } |
Christoph Hellwig | f7899bd | 2010-10-23 07:09:06 -0400 | [diff] [blame] | 830 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 831 | } |
| 832 | |
Eric Dumazet | f991bd2 | 2010-10-23 11:18:01 -0400 | [diff] [blame] | 833 | /* |
| 834 | * Each cpu owns a range of LAST_INO_BATCH numbers. |
| 835 | * 'shared_last_ino' is dirtied only once out of LAST_INO_BATCH allocations, |
| 836 | * to renew the exhausted range. |
David Chinner | 8290c35 | 2008-10-30 17:35:24 +1100 | [diff] [blame] | 837 | * |
Eric Dumazet | f991bd2 | 2010-10-23 11:18:01 -0400 | [diff] [blame] | 838 | * This does not significantly increase overflow rate because every CPU can |
| 839 | * consume at most LAST_INO_BATCH-1 unused inode numbers. So there is |
| 840 | * NR_CPUS*(LAST_INO_BATCH-1) wastage. At 4096 and 1024, this is ~0.1% of the |
| 841 | * 2^32 range, and is a worst-case. Even a 50% wastage would only increase |
| 842 | * overflow rate by 2x, which does not seem too significant. |
| 843 | * |
| 844 | * On a 32bit, non LFS stat() call, glibc will generate an EOVERFLOW |
| 845 | * error if st_ino won't fit in target struct field. Use 32bit counter |
| 846 | * here to attempt to avoid that. |
David Chinner | 8290c35 | 2008-10-30 17:35:24 +1100 | [diff] [blame] | 847 | */ |
Eric Dumazet | f991bd2 | 2010-10-23 11:18:01 -0400 | [diff] [blame] | 848 | #define LAST_INO_BATCH 1024 |
| 849 | static DEFINE_PER_CPU(unsigned int, last_ino); |
David Chinner | 8290c35 | 2008-10-30 17:35:24 +1100 | [diff] [blame] | 850 | |
Christoph Hellwig | 85fe402 | 2010-10-23 11:19:54 -0400 | [diff] [blame] | 851 | unsigned int get_next_ino(void) |
Eric Dumazet | f991bd2 | 2010-10-23 11:18:01 -0400 | [diff] [blame] | 852 | { |
| 853 | unsigned int *p = &get_cpu_var(last_ino); |
| 854 | unsigned int res = *p; |
| 855 | |
| 856 | #ifdef CONFIG_SMP |
| 857 | if (unlikely((res & (LAST_INO_BATCH-1)) == 0)) { |
| 858 | static atomic_t shared_last_ino; |
| 859 | int next = atomic_add_return(LAST_INO_BATCH, &shared_last_ino); |
| 860 | |
| 861 | res = next - LAST_INO_BATCH; |
| 862 | } |
| 863 | #endif |
| 864 | |
Carlos Maiolino | 2adc376 | 2015-06-25 12:25:58 -0300 | [diff] [blame] | 865 | res++; |
| 866 | /* get_next_ino should not provide a 0 inode number */ |
| 867 | if (unlikely(!res)) |
| 868 | res++; |
| 869 | *p = res; |
Eric Dumazet | f991bd2 | 2010-10-23 11:18:01 -0400 | [diff] [blame] | 870 | put_cpu_var(last_ino); |
| 871 | return res; |
David Chinner | 8290c35 | 2008-10-30 17:35:24 +1100 | [diff] [blame] | 872 | } |
Christoph Hellwig | 85fe402 | 2010-10-23 11:19:54 -0400 | [diff] [blame] | 873 | EXPORT_SYMBOL(get_next_ino); |
David Chinner | 8290c35 | 2008-10-30 17:35:24 +1100 | [diff] [blame] | 874 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | /** |
Eric Dumazet | a209dfc | 2011-07-26 11:36:34 +0200 | [diff] [blame] | 876 | * new_inode_pseudo - obtain an inode |
| 877 | * @sb: superblock |
| 878 | * |
| 879 | * Allocates a new inode for given superblock. |
| 880 | * Inode wont be chained in superblock s_inodes list |
| 881 | * This means : |
| 882 | * - fs can't be unmount |
| 883 | * - quotas, fsnotify, writeback can't work |
| 884 | */ |
| 885 | struct inode *new_inode_pseudo(struct super_block *sb) |
| 886 | { |
| 887 | struct inode *inode = alloc_inode(sb); |
| 888 | |
| 889 | if (inode) { |
| 890 | spin_lock(&inode->i_lock); |
| 891 | inode->i_state = 0; |
| 892 | spin_unlock(&inode->i_lock); |
| 893 | INIT_LIST_HEAD(&inode->i_sb_list); |
| 894 | } |
| 895 | return inode; |
| 896 | } |
| 897 | |
| 898 | /** |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | * new_inode - obtain an inode |
| 900 | * @sb: superblock |
| 901 | * |
Mel Gorman | 769848c | 2007-07-17 04:03:05 -0700 | [diff] [blame] | 902 | * Allocates a new inode for given superblock. The default gfp_mask |
Hugh Dickins | 3c1d437 | 2009-01-06 14:39:23 -0800 | [diff] [blame] | 903 | * for allocations related to inode->i_mapping is GFP_HIGHUSER_MOVABLE. |
Mel Gorman | 769848c | 2007-07-17 04:03:05 -0700 | [diff] [blame] | 904 | * If HIGHMEM pages are unsuitable or it is known that pages allocated |
| 905 | * for the page cache are not reclaimable or migratable, |
| 906 | * mapping_set_gfp_mask() must be called with suitable flags on the |
| 907 | * newly created inode's mapping |
| 908 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | */ |
| 910 | struct inode *new_inode(struct super_block *sb) |
| 911 | { |
Manish Katiyar | 6b3304b | 2009-03-31 19:35:54 +0530 | [diff] [blame] | 912 | struct inode *inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 913 | |
Dave Chinner | 74278da | 2015-03-04 12:37:22 -0500 | [diff] [blame] | 914 | spin_lock_prefetch(&sb->s_inode_list_lock); |
Manish Katiyar | 6b3304b | 2009-03-31 19:35:54 +0530 | [diff] [blame] | 915 | |
Eric Dumazet | a209dfc | 2011-07-26 11:36:34 +0200 | [diff] [blame] | 916 | inode = new_inode_pseudo(sb); |
| 917 | if (inode) |
Dave Chinner | 55fa609 | 2011-03-22 22:23:40 +1100 | [diff] [blame] | 918 | inode_sb_list_add(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 919 | return inode; |
| 920 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 921 | EXPORT_SYMBOL(new_inode); |
| 922 | |
Peter Zijlstra | 14358e6 | 2007-10-14 01:38:33 +0200 | [diff] [blame] | 923 | #ifdef CONFIG_DEBUG_LOCK_ALLOC |
Josh Boyer | e096d0c | 2011-08-25 07:48:12 -0400 | [diff] [blame] | 924 | void lockdep_annotate_inode_mutex_key(struct inode *inode) |
| 925 | { |
Namhyung Kim | a3314a0 | 2010-10-11 22:38:00 +0900 | [diff] [blame] | 926 | if (S_ISDIR(inode->i_mode)) { |
Peter Zijlstra | 1e89a5e | 2007-10-16 06:47:54 +0200 | [diff] [blame] | 927 | struct file_system_type *type = inode->i_sb->s_type; |
| 928 | |
Jan Kara | 9a7aa12 | 2009-06-04 15:26:49 +0200 | [diff] [blame] | 929 | /* Set new key only if filesystem hasn't already changed it */ |
Al Viro | 9902af7 | 2016-04-15 15:08:36 -0400 | [diff] [blame] | 930 | if (lockdep_match_class(&inode->i_rwsem, &type->i_mutex_key)) { |
Jan Kara | 9a7aa12 | 2009-06-04 15:26:49 +0200 | [diff] [blame] | 931 | /* |
| 932 | * ensure nobody is actually holding i_mutex |
| 933 | */ |
Al Viro | 9902af7 | 2016-04-15 15:08:36 -0400 | [diff] [blame] | 934 | // mutex_destroy(&inode->i_mutex); |
| 935 | init_rwsem(&inode->i_rwsem); |
| 936 | lockdep_set_class(&inode->i_rwsem, |
Jan Kara | 9a7aa12 | 2009-06-04 15:26:49 +0200 | [diff] [blame] | 937 | &type->i_mutex_dir_key); |
| 938 | } |
Peter Zijlstra | 1e89a5e | 2007-10-16 06:47:54 +0200 | [diff] [blame] | 939 | } |
Josh Boyer | e096d0c | 2011-08-25 07:48:12 -0400 | [diff] [blame] | 940 | } |
| 941 | EXPORT_SYMBOL(lockdep_annotate_inode_mutex_key); |
Peter Zijlstra | 14358e6 | 2007-10-14 01:38:33 +0200 | [diff] [blame] | 942 | #endif |
Josh Boyer | e096d0c | 2011-08-25 07:48:12 -0400 | [diff] [blame] | 943 | |
| 944 | /** |
| 945 | * unlock_new_inode - clear the I_NEW state and wake up any waiters |
| 946 | * @inode: new inode to unlock |
| 947 | * |
| 948 | * Called when the inode is fully initialised to clear the new state of the |
| 949 | * inode and wake up anyone waiting for the inode to finish initialisation. |
| 950 | */ |
| 951 | void unlock_new_inode(struct inode *inode) |
| 952 | { |
| 953 | lockdep_annotate_inode_mutex_key(inode); |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 954 | spin_lock(&inode->i_lock); |
Christoph Hellwig | eaff807 | 2009-12-17 14:25:01 +0100 | [diff] [blame] | 955 | WARN_ON(!(inode->i_state & I_NEW)); |
| 956 | inode->i_state &= ~I_NEW; |
Al Viro | 310fa7a | 2012-03-10 17:07:28 -0500 | [diff] [blame] | 957 | smp_mb(); |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 958 | wake_up_bit(&inode->i_state, __I_NEW); |
| 959 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 961 | EXPORT_SYMBOL(unlock_new_inode); |
| 962 | |
Christoph Hellwig | 0b2d072 | 2011-03-23 15:03:28 -0400 | [diff] [blame] | 963 | /** |
J. Bruce Fields | 375e289 | 2012-04-18 15:16:33 -0400 | [diff] [blame] | 964 | * lock_two_nondirectories - take two i_mutexes on non-directory objects |
J. Bruce Fields | 4fd699a | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 965 | * |
| 966 | * Lock any non-NULL argument that is not a directory. |
| 967 | * Zero, one or two objects may be locked by this function. |
| 968 | * |
J. Bruce Fields | 375e289 | 2012-04-18 15:16:33 -0400 | [diff] [blame] | 969 | * @inode1: first inode to lock |
| 970 | * @inode2: second inode to lock |
| 971 | */ |
| 972 | void lock_two_nondirectories(struct inode *inode1, struct inode *inode2) |
| 973 | { |
J. Bruce Fields | 4fd699a | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 974 | if (inode1 > inode2) |
| 975 | swap(inode1, inode2); |
| 976 | |
| 977 | if (inode1 && !S_ISDIR(inode1->i_mode)) |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 978 | inode_lock(inode1); |
J. Bruce Fields | 4fd699a | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 979 | if (inode2 && !S_ISDIR(inode2->i_mode) && inode2 != inode1) |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 980 | inode_lock_nested(inode2, I_MUTEX_NONDIR2); |
J. Bruce Fields | 375e289 | 2012-04-18 15:16:33 -0400 | [diff] [blame] | 981 | } |
| 982 | EXPORT_SYMBOL(lock_two_nondirectories); |
| 983 | |
| 984 | /** |
| 985 | * unlock_two_nondirectories - release locks from lock_two_nondirectories() |
| 986 | * @inode1: first inode to unlock |
| 987 | * @inode2: second inode to unlock |
| 988 | */ |
| 989 | void unlock_two_nondirectories(struct inode *inode1, struct inode *inode2) |
| 990 | { |
J. Bruce Fields | 4fd699a | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 991 | if (inode1 && !S_ISDIR(inode1->i_mode)) |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 992 | inode_unlock(inode1); |
J. Bruce Fields | 4fd699a | 2014-04-01 17:08:43 +0200 | [diff] [blame] | 993 | if (inode2 && !S_ISDIR(inode2->i_mode) && inode2 != inode1) |
Al Viro | 5955102 | 2016-01-22 15:40:57 -0500 | [diff] [blame] | 994 | inode_unlock(inode2); |
J. Bruce Fields | 375e289 | 2012-04-18 15:16:33 -0400 | [diff] [blame] | 995 | } |
| 996 | EXPORT_SYMBOL(unlock_two_nondirectories); |
| 997 | |
| 998 | /** |
Christoph Hellwig | 0b2d072 | 2011-03-23 15:03:28 -0400 | [diff] [blame] | 999 | * iget5_locked - obtain an inode from a mounted file system |
| 1000 | * @sb: super block of file system |
| 1001 | * @hashval: hash value (usually inode number) to get |
| 1002 | * @test: callback used for comparisons between inodes |
| 1003 | * @set: callback used to initialize a new struct inode |
| 1004 | * @data: opaque data pointer to pass to @test and @set |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1005 | * |
Christoph Hellwig | 0b2d072 | 2011-03-23 15:03:28 -0400 | [diff] [blame] | 1006 | * Search for the inode specified by @hashval and @data in the inode cache, |
| 1007 | * and if present it is return it with an increased reference count. This is |
| 1008 | * a generalized version of iget_locked() for file systems where the inode |
| 1009 | * number is not sufficient for unique identification of an inode. |
| 1010 | * |
| 1011 | * If the inode is not in cache, allocate a new inode and return it locked, |
| 1012 | * hashed, and with the I_NEW flag set. The file system gets to fill it in |
| 1013 | * before unlocking it via unlock_new_inode(). |
| 1014 | * |
| 1015 | * Note both @test and @set are called with the inode_hash_lock held, so can't |
| 1016 | * sleep. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1017 | */ |
Christoph Hellwig | 0b2d072 | 2011-03-23 15:03:28 -0400 | [diff] [blame] | 1018 | struct inode *iget5_locked(struct super_block *sb, unsigned long hashval, |
| 1019 | int (*test)(struct inode *, void *), |
| 1020 | int (*set)(struct inode *, void *), void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1021 | { |
Christoph Hellwig | 0b2d072 | 2011-03-23 15:03:28 -0400 | [diff] [blame] | 1022 | struct hlist_head *head = inode_hashtable + hash(sb, hashval); |
Manish Katiyar | 6b3304b | 2009-03-31 19:35:54 +0530 | [diff] [blame] | 1023 | struct inode *inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1024 | |
Christoph Hellwig | 0b2d072 | 2011-03-23 15:03:28 -0400 | [diff] [blame] | 1025 | spin_lock(&inode_hash_lock); |
| 1026 | inode = find_inode(sb, head, test, data); |
| 1027 | spin_unlock(&inode_hash_lock); |
| 1028 | |
| 1029 | if (inode) { |
| 1030 | wait_on_inode(inode); |
| 1031 | return inode; |
| 1032 | } |
| 1033 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1034 | inode = alloc_inode(sb); |
| 1035 | if (inode) { |
Manish Katiyar | 6b3304b | 2009-03-31 19:35:54 +0530 | [diff] [blame] | 1036 | struct inode *old; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1037 | |
Dave Chinner | 67a23c4 | 2011-03-22 22:23:42 +1100 | [diff] [blame] | 1038 | spin_lock(&inode_hash_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1039 | /* We released the lock, so.. */ |
| 1040 | old = find_inode(sb, head, test, data); |
| 1041 | if (!old) { |
| 1042 | if (set(inode, data)) |
| 1043 | goto set_failed; |
| 1044 | |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 1045 | spin_lock(&inode->i_lock); |
Christoph Hellwig | eaff807 | 2009-12-17 14:25:01 +0100 | [diff] [blame] | 1046 | inode->i_state = I_NEW; |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 1047 | hlist_add_head(&inode->i_hash, head); |
| 1048 | spin_unlock(&inode->i_lock); |
Dave Chinner | 55fa609 | 2011-03-22 22:23:40 +1100 | [diff] [blame] | 1049 | inode_sb_list_add(inode); |
Dave Chinner | 67a23c4 | 2011-03-22 22:23:42 +1100 | [diff] [blame] | 1050 | spin_unlock(&inode_hash_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1051 | |
| 1052 | /* Return the locked inode with I_NEW set, the |
| 1053 | * caller is responsible for filling in the contents |
| 1054 | */ |
| 1055 | return inode; |
| 1056 | } |
| 1057 | |
| 1058 | /* |
| 1059 | * Uhhuh, somebody else created the same inode under |
| 1060 | * us. Use the old inode instead of the one we just |
| 1061 | * allocated. |
| 1062 | */ |
Dave Chinner | 67a23c4 | 2011-03-22 22:23:42 +1100 | [diff] [blame] | 1063 | spin_unlock(&inode_hash_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1064 | destroy_inode(inode); |
| 1065 | inode = old; |
| 1066 | wait_on_inode(inode); |
| 1067 | } |
| 1068 | return inode; |
| 1069 | |
| 1070 | set_failed: |
Dave Chinner | 67a23c4 | 2011-03-22 22:23:42 +1100 | [diff] [blame] | 1071 | spin_unlock(&inode_hash_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1072 | destroy_inode(inode); |
| 1073 | return NULL; |
| 1074 | } |
Christoph Hellwig | 0b2d072 | 2011-03-23 15:03:28 -0400 | [diff] [blame] | 1075 | EXPORT_SYMBOL(iget5_locked); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1076 | |
Christoph Hellwig | 0b2d072 | 2011-03-23 15:03:28 -0400 | [diff] [blame] | 1077 | /** |
| 1078 | * iget_locked - obtain an inode from a mounted file system |
| 1079 | * @sb: super block of file system |
| 1080 | * @ino: inode number to get |
| 1081 | * |
| 1082 | * Search for the inode specified by @ino in the inode cache and if present |
| 1083 | * return it with an increased reference count. This is for file systems |
| 1084 | * where the inode number is sufficient for unique identification of an inode. |
| 1085 | * |
| 1086 | * If the inode is not in cache, allocate a new inode and return it locked, |
| 1087 | * hashed, and with the I_NEW flag set. The file system gets to fill it in |
| 1088 | * before unlocking it via unlock_new_inode(). |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1089 | */ |
Christoph Hellwig | 0b2d072 | 2011-03-23 15:03:28 -0400 | [diff] [blame] | 1090 | struct inode *iget_locked(struct super_block *sb, unsigned long ino) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1091 | { |
Christoph Hellwig | 0b2d072 | 2011-03-23 15:03:28 -0400 | [diff] [blame] | 1092 | struct hlist_head *head = inode_hashtable + hash(sb, ino); |
Manish Katiyar | 6b3304b | 2009-03-31 19:35:54 +0530 | [diff] [blame] | 1093 | struct inode *inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1094 | |
Christoph Hellwig | 0b2d072 | 2011-03-23 15:03:28 -0400 | [diff] [blame] | 1095 | spin_lock(&inode_hash_lock); |
| 1096 | inode = find_inode_fast(sb, head, ino); |
| 1097 | spin_unlock(&inode_hash_lock); |
| 1098 | if (inode) { |
| 1099 | wait_on_inode(inode); |
| 1100 | return inode; |
| 1101 | } |
| 1102 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1103 | inode = alloc_inode(sb); |
| 1104 | if (inode) { |
Manish Katiyar | 6b3304b | 2009-03-31 19:35:54 +0530 | [diff] [blame] | 1105 | struct inode *old; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1106 | |
Dave Chinner | 67a23c4 | 2011-03-22 22:23:42 +1100 | [diff] [blame] | 1107 | spin_lock(&inode_hash_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1108 | /* We released the lock, so.. */ |
| 1109 | old = find_inode_fast(sb, head, ino); |
| 1110 | if (!old) { |
| 1111 | inode->i_ino = ino; |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 1112 | spin_lock(&inode->i_lock); |
Christoph Hellwig | eaff807 | 2009-12-17 14:25:01 +0100 | [diff] [blame] | 1113 | inode->i_state = I_NEW; |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 1114 | hlist_add_head(&inode->i_hash, head); |
| 1115 | spin_unlock(&inode->i_lock); |
Dave Chinner | 55fa609 | 2011-03-22 22:23:40 +1100 | [diff] [blame] | 1116 | inode_sb_list_add(inode); |
Dave Chinner | 67a23c4 | 2011-03-22 22:23:42 +1100 | [diff] [blame] | 1117 | spin_unlock(&inode_hash_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1118 | |
| 1119 | /* Return the locked inode with I_NEW set, the |
| 1120 | * caller is responsible for filling in the contents |
| 1121 | */ |
| 1122 | return inode; |
| 1123 | } |
| 1124 | |
| 1125 | /* |
| 1126 | * Uhhuh, somebody else created the same inode under |
| 1127 | * us. Use the old inode instead of the one we just |
| 1128 | * allocated. |
| 1129 | */ |
Dave Chinner | 67a23c4 | 2011-03-22 22:23:42 +1100 | [diff] [blame] | 1130 | spin_unlock(&inode_hash_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1131 | destroy_inode(inode); |
| 1132 | inode = old; |
| 1133 | wait_on_inode(inode); |
| 1134 | } |
| 1135 | return inode; |
| 1136 | } |
Christoph Hellwig | 0b2d072 | 2011-03-23 15:03:28 -0400 | [diff] [blame] | 1137 | EXPORT_SYMBOL(iget_locked); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1138 | |
Christoph Hellwig | ad5e195 | 2010-10-23 07:00:16 -0400 | [diff] [blame] | 1139 | /* |
| 1140 | * search the inode cache for a matching inode number. |
| 1141 | * If we find one, then the inode number we are trying to |
| 1142 | * allocate is not unique and so we should not use it. |
| 1143 | * |
| 1144 | * Returns 1 if the inode number is unique, 0 if it is not. |
| 1145 | */ |
| 1146 | static int test_inode_iunique(struct super_block *sb, unsigned long ino) |
| 1147 | { |
| 1148 | struct hlist_head *b = inode_hashtable + hash(sb, ino); |
Christoph Hellwig | ad5e195 | 2010-10-23 07:00:16 -0400 | [diff] [blame] | 1149 | struct inode *inode; |
| 1150 | |
Dave Chinner | 67a23c4 | 2011-03-22 22:23:42 +1100 | [diff] [blame] | 1151 | spin_lock(&inode_hash_lock); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 1152 | hlist_for_each_entry(inode, b, i_hash) { |
Dave Chinner | 67a23c4 | 2011-03-22 22:23:42 +1100 | [diff] [blame] | 1153 | if (inode->i_ino == ino && inode->i_sb == sb) { |
| 1154 | spin_unlock(&inode_hash_lock); |
Christoph Hellwig | ad5e195 | 2010-10-23 07:00:16 -0400 | [diff] [blame] | 1155 | return 0; |
Dave Chinner | 67a23c4 | 2011-03-22 22:23:42 +1100 | [diff] [blame] | 1156 | } |
Christoph Hellwig | ad5e195 | 2010-10-23 07:00:16 -0400 | [diff] [blame] | 1157 | } |
Dave Chinner | 67a23c4 | 2011-03-22 22:23:42 +1100 | [diff] [blame] | 1158 | spin_unlock(&inode_hash_lock); |
Christoph Hellwig | ad5e195 | 2010-10-23 07:00:16 -0400 | [diff] [blame] | 1159 | |
| 1160 | return 1; |
| 1161 | } |
| 1162 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1163 | /** |
| 1164 | * iunique - get a unique inode number |
| 1165 | * @sb: superblock |
| 1166 | * @max_reserved: highest reserved inode number |
| 1167 | * |
| 1168 | * Obtain an inode number that is unique on the system for a given |
| 1169 | * superblock. This is used by file systems that have no natural |
| 1170 | * permanent inode numbering system. An inode number is returned that |
| 1171 | * is higher than the reserved limit but unique. |
| 1172 | * |
| 1173 | * BUGS: |
| 1174 | * With a large number of inodes live on the file system this function |
| 1175 | * currently becomes quite slow. |
| 1176 | */ |
| 1177 | ino_t iunique(struct super_block *sb, ino_t max_reserved) |
| 1178 | { |
Jeff Layton | 866b04f | 2007-05-08 00:32:29 -0700 | [diff] [blame] | 1179 | /* |
| 1180 | * On a 32bit, non LFS stat() call, glibc will generate an EOVERFLOW |
| 1181 | * error if st_ino won't fit in target struct field. Use 32bit counter |
| 1182 | * here to attempt to avoid that. |
| 1183 | */ |
Christoph Hellwig | ad5e195 | 2010-10-23 07:00:16 -0400 | [diff] [blame] | 1184 | static DEFINE_SPINLOCK(iunique_lock); |
Jeff Layton | 866b04f | 2007-05-08 00:32:29 -0700 | [diff] [blame] | 1185 | static unsigned int counter; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1186 | ino_t res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1187 | |
Christoph Hellwig | ad5e195 | 2010-10-23 07:00:16 -0400 | [diff] [blame] | 1188 | spin_lock(&iunique_lock); |
Jeffrey Layton | 3361c7b | 2007-05-08 00:29:48 -0700 | [diff] [blame] | 1189 | do { |
| 1190 | if (counter <= max_reserved) |
| 1191 | counter = max_reserved + 1; |
| 1192 | res = counter++; |
Christoph Hellwig | ad5e195 | 2010-10-23 07:00:16 -0400 | [diff] [blame] | 1193 | } while (!test_inode_iunique(sb, res)); |
| 1194 | spin_unlock(&iunique_lock); |
Jeffrey Layton | 3361c7b | 2007-05-08 00:29:48 -0700 | [diff] [blame] | 1195 | |
| 1196 | return res; |
| 1197 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1198 | EXPORT_SYMBOL(iunique); |
| 1199 | |
| 1200 | struct inode *igrab(struct inode *inode) |
| 1201 | { |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 1202 | spin_lock(&inode->i_lock); |
| 1203 | if (!(inode->i_state & (I_FREEING|I_WILL_FREE))) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1204 | __iget(inode); |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 1205 | spin_unlock(&inode->i_lock); |
| 1206 | } else { |
| 1207 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1208 | /* |
| 1209 | * Handle the case where s_op->clear_inode is not been |
| 1210 | * called yet, and somebody is calling igrab |
| 1211 | * while the inode is getting freed. |
| 1212 | */ |
| 1213 | inode = NULL; |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 1214 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1215 | return inode; |
| 1216 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1217 | EXPORT_SYMBOL(igrab); |
| 1218 | |
| 1219 | /** |
Anton Altaparmakov | 88bd512 | 2005-07-13 01:10:44 -0700 | [diff] [blame] | 1220 | * ilookup5_nowait - search for an inode in the inode cache |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1221 | * @sb: super block of file system to search |
| 1222 | * @hashval: hash value (usually inode number) to search for |
| 1223 | * @test: callback used for comparisons between inodes |
| 1224 | * @data: opaque data pointer to pass to @test |
| 1225 | * |
Christoph Hellwig | 0b2d072 | 2011-03-23 15:03:28 -0400 | [diff] [blame] | 1226 | * Search for the inode specified by @hashval and @data in the inode cache. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1227 | * If the inode is in the cache, the inode is returned with an incremented |
Christoph Hellwig | 0b2d072 | 2011-03-23 15:03:28 -0400 | [diff] [blame] | 1228 | * reference count. |
Anton Altaparmakov | 88bd512 | 2005-07-13 01:10:44 -0700 | [diff] [blame] | 1229 | * |
Christoph Hellwig | 0b2d072 | 2011-03-23 15:03:28 -0400 | [diff] [blame] | 1230 | * Note: I_NEW is not waited upon so you have to be very careful what you do |
| 1231 | * with the returned inode. You probably should be using ilookup5() instead. |
Anton Altaparmakov | 88bd512 | 2005-07-13 01:10:44 -0700 | [diff] [blame] | 1232 | * |
Randy Dunlap | b6d0ad6 | 2011-03-26 13:27:47 -0700 | [diff] [blame] | 1233 | * Note2: @test is called with the inode_hash_lock held, so can't sleep. |
Anton Altaparmakov | 88bd512 | 2005-07-13 01:10:44 -0700 | [diff] [blame] | 1234 | */ |
| 1235 | struct inode *ilookup5_nowait(struct super_block *sb, unsigned long hashval, |
| 1236 | int (*test)(struct inode *, void *), void *data) |
| 1237 | { |
| 1238 | struct hlist_head *head = inode_hashtable + hash(sb, hashval); |
Christoph Hellwig | 0b2d072 | 2011-03-23 15:03:28 -0400 | [diff] [blame] | 1239 | struct inode *inode; |
Anton Altaparmakov | 88bd512 | 2005-07-13 01:10:44 -0700 | [diff] [blame] | 1240 | |
Christoph Hellwig | 0b2d072 | 2011-03-23 15:03:28 -0400 | [diff] [blame] | 1241 | spin_lock(&inode_hash_lock); |
| 1242 | inode = find_inode(sb, head, test, data); |
| 1243 | spin_unlock(&inode_hash_lock); |
| 1244 | |
| 1245 | return inode; |
Anton Altaparmakov | 88bd512 | 2005-07-13 01:10:44 -0700 | [diff] [blame] | 1246 | } |
Anton Altaparmakov | 88bd512 | 2005-07-13 01:10:44 -0700 | [diff] [blame] | 1247 | EXPORT_SYMBOL(ilookup5_nowait); |
| 1248 | |
| 1249 | /** |
| 1250 | * ilookup5 - search for an inode in the inode cache |
| 1251 | * @sb: super block of file system to search |
| 1252 | * @hashval: hash value (usually inode number) to search for |
| 1253 | * @test: callback used for comparisons between inodes |
| 1254 | * @data: opaque data pointer to pass to @test |
| 1255 | * |
Christoph Hellwig | 0b2d072 | 2011-03-23 15:03:28 -0400 | [diff] [blame] | 1256 | * Search for the inode specified by @hashval and @data in the inode cache, |
| 1257 | * and if the inode is in the cache, return the inode with an incremented |
| 1258 | * reference count. Waits on I_NEW before returning the inode. |
Anton Altaparmakov | 88bd512 | 2005-07-13 01:10:44 -0700 | [diff] [blame] | 1259 | * returned with an incremented reference count. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1260 | * |
Christoph Hellwig | 0b2d072 | 2011-03-23 15:03:28 -0400 | [diff] [blame] | 1261 | * This is a generalized version of ilookup() for file systems where the |
| 1262 | * inode number is not sufficient for unique identification of an inode. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1263 | * |
Christoph Hellwig | 0b2d072 | 2011-03-23 15:03:28 -0400 | [diff] [blame] | 1264 | * Note: @test is called with the inode_hash_lock held, so can't sleep. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1265 | */ |
| 1266 | struct inode *ilookup5(struct super_block *sb, unsigned long hashval, |
| 1267 | int (*test)(struct inode *, void *), void *data) |
| 1268 | { |
Christoph Hellwig | 0b2d072 | 2011-03-23 15:03:28 -0400 | [diff] [blame] | 1269 | struct inode *inode = ilookup5_nowait(sb, hashval, test, data); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1270 | |
Christoph Hellwig | 0b2d072 | 2011-03-23 15:03:28 -0400 | [diff] [blame] | 1271 | if (inode) |
| 1272 | wait_on_inode(inode); |
| 1273 | return inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1274 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1275 | EXPORT_SYMBOL(ilookup5); |
| 1276 | |
| 1277 | /** |
| 1278 | * ilookup - search for an inode in the inode cache |
| 1279 | * @sb: super block of file system to search |
| 1280 | * @ino: inode number to search for |
| 1281 | * |
Christoph Hellwig | 0b2d072 | 2011-03-23 15:03:28 -0400 | [diff] [blame] | 1282 | * Search for the inode @ino in the inode cache, and if the inode is in the |
| 1283 | * cache, the inode is returned with an incremented reference count. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1284 | */ |
| 1285 | struct inode *ilookup(struct super_block *sb, unsigned long ino) |
| 1286 | { |
| 1287 | struct hlist_head *head = inode_hashtable + hash(sb, ino); |
Christoph Hellwig | 0b2d072 | 2011-03-23 15:03:28 -0400 | [diff] [blame] | 1288 | struct inode *inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1289 | |
Christoph Hellwig | 0b2d072 | 2011-03-23 15:03:28 -0400 | [diff] [blame] | 1290 | spin_lock(&inode_hash_lock); |
| 1291 | inode = find_inode_fast(sb, head, ino); |
| 1292 | spin_unlock(&inode_hash_lock); |
| 1293 | |
| 1294 | if (inode) |
| 1295 | wait_on_inode(inode); |
| 1296 | return inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1297 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1298 | EXPORT_SYMBOL(ilookup); |
| 1299 | |
Theodore Ts'o | fe032c4 | 2015-02-02 00:37:01 -0500 | [diff] [blame] | 1300 | /** |
| 1301 | * find_inode_nowait - find an inode in the inode cache |
| 1302 | * @sb: super block of file system to search |
| 1303 | * @hashval: hash value (usually inode number) to search for |
| 1304 | * @match: callback used for comparisons between inodes |
| 1305 | * @data: opaque data pointer to pass to @match |
| 1306 | * |
| 1307 | * Search for the inode specified by @hashval and @data in the inode |
| 1308 | * cache, where the helper function @match will return 0 if the inode |
| 1309 | * does not match, 1 if the inode does match, and -1 if the search |
| 1310 | * should be stopped. The @match function must be responsible for |
| 1311 | * taking the i_lock spin_lock and checking i_state for an inode being |
| 1312 | * freed or being initialized, and incrementing the reference count |
| 1313 | * before returning 1. It also must not sleep, since it is called with |
| 1314 | * the inode_hash_lock spinlock held. |
| 1315 | * |
| 1316 | * This is a even more generalized version of ilookup5() when the |
| 1317 | * function must never block --- find_inode() can block in |
| 1318 | * __wait_on_freeing_inode() --- or when the caller can not increment |
| 1319 | * the reference count because the resulting iput() might cause an |
| 1320 | * inode eviction. The tradeoff is that the @match funtion must be |
| 1321 | * very carefully implemented. |
| 1322 | */ |
| 1323 | struct inode *find_inode_nowait(struct super_block *sb, |
| 1324 | unsigned long hashval, |
| 1325 | int (*match)(struct inode *, unsigned long, |
| 1326 | void *), |
| 1327 | void *data) |
| 1328 | { |
| 1329 | struct hlist_head *head = inode_hashtable + hash(sb, hashval); |
| 1330 | struct inode *inode, *ret_inode = NULL; |
| 1331 | int mval; |
| 1332 | |
| 1333 | spin_lock(&inode_hash_lock); |
| 1334 | hlist_for_each_entry(inode, head, i_hash) { |
| 1335 | if (inode->i_sb != sb) |
| 1336 | continue; |
| 1337 | mval = match(inode, hashval, data); |
| 1338 | if (mval == 0) |
| 1339 | continue; |
| 1340 | if (mval == 1) |
| 1341 | ret_inode = inode; |
| 1342 | goto out; |
| 1343 | } |
| 1344 | out: |
| 1345 | spin_unlock(&inode_hash_lock); |
| 1346 | return ret_inode; |
| 1347 | } |
| 1348 | EXPORT_SYMBOL(find_inode_nowait); |
| 1349 | |
Al Viro | 261bca8 | 2008-12-30 01:48:21 -0500 | [diff] [blame] | 1350 | int insert_inode_locked(struct inode *inode) |
| 1351 | { |
| 1352 | struct super_block *sb = inode->i_sb; |
| 1353 | ino_t ino = inode->i_ino; |
| 1354 | struct hlist_head *head = inode_hashtable + hash(sb, ino); |
Al Viro | 261bca8 | 2008-12-30 01:48:21 -0500 | [diff] [blame] | 1355 | |
Al Viro | 261bca8 | 2008-12-30 01:48:21 -0500 | [diff] [blame] | 1356 | while (1) { |
Al Viro | 72a43d6 | 2009-05-13 19:13:40 +0100 | [diff] [blame] | 1357 | struct inode *old = NULL; |
Dave Chinner | 67a23c4 | 2011-03-22 22:23:42 +1100 | [diff] [blame] | 1358 | spin_lock(&inode_hash_lock); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 1359 | hlist_for_each_entry(old, head, i_hash) { |
Al Viro | 72a43d6 | 2009-05-13 19:13:40 +0100 | [diff] [blame] | 1360 | if (old->i_ino != ino) |
| 1361 | continue; |
| 1362 | if (old->i_sb != sb) |
| 1363 | continue; |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 1364 | spin_lock(&old->i_lock); |
| 1365 | if (old->i_state & (I_FREEING|I_WILL_FREE)) { |
| 1366 | spin_unlock(&old->i_lock); |
Al Viro | 72a43d6 | 2009-05-13 19:13:40 +0100 | [diff] [blame] | 1367 | continue; |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 1368 | } |
Al Viro | 72a43d6 | 2009-05-13 19:13:40 +0100 | [diff] [blame] | 1369 | break; |
| 1370 | } |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 1371 | if (likely(!old)) { |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 1372 | spin_lock(&inode->i_lock); |
| 1373 | inode->i_state |= I_NEW; |
Al Viro | 261bca8 | 2008-12-30 01:48:21 -0500 | [diff] [blame] | 1374 | hlist_add_head(&inode->i_hash, head); |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 1375 | spin_unlock(&inode->i_lock); |
Dave Chinner | 67a23c4 | 2011-03-22 22:23:42 +1100 | [diff] [blame] | 1376 | spin_unlock(&inode_hash_lock); |
Al Viro | 261bca8 | 2008-12-30 01:48:21 -0500 | [diff] [blame] | 1377 | return 0; |
| 1378 | } |
| 1379 | __iget(old); |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 1380 | spin_unlock(&old->i_lock); |
Dave Chinner | 67a23c4 | 2011-03-22 22:23:42 +1100 | [diff] [blame] | 1381 | spin_unlock(&inode_hash_lock); |
Al Viro | 261bca8 | 2008-12-30 01:48:21 -0500 | [diff] [blame] | 1382 | wait_on_inode(old); |
Al Viro | 1d3382cb | 2010-10-23 15:19:20 -0400 | [diff] [blame] | 1383 | if (unlikely(!inode_unhashed(old))) { |
Al Viro | 261bca8 | 2008-12-30 01:48:21 -0500 | [diff] [blame] | 1384 | iput(old); |
| 1385 | return -EBUSY; |
| 1386 | } |
| 1387 | iput(old); |
| 1388 | } |
| 1389 | } |
Al Viro | 261bca8 | 2008-12-30 01:48:21 -0500 | [diff] [blame] | 1390 | EXPORT_SYMBOL(insert_inode_locked); |
| 1391 | |
| 1392 | int insert_inode_locked4(struct inode *inode, unsigned long hashval, |
| 1393 | int (*test)(struct inode *, void *), void *data) |
| 1394 | { |
| 1395 | struct super_block *sb = inode->i_sb; |
| 1396 | struct hlist_head *head = inode_hashtable + hash(sb, hashval); |
Al Viro | 261bca8 | 2008-12-30 01:48:21 -0500 | [diff] [blame] | 1397 | |
Al Viro | 261bca8 | 2008-12-30 01:48:21 -0500 | [diff] [blame] | 1398 | while (1) { |
Al Viro | 72a43d6 | 2009-05-13 19:13:40 +0100 | [diff] [blame] | 1399 | struct inode *old = NULL; |
| 1400 | |
Dave Chinner | 67a23c4 | 2011-03-22 22:23:42 +1100 | [diff] [blame] | 1401 | spin_lock(&inode_hash_lock); |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 1402 | hlist_for_each_entry(old, head, i_hash) { |
Al Viro | 72a43d6 | 2009-05-13 19:13:40 +0100 | [diff] [blame] | 1403 | if (old->i_sb != sb) |
| 1404 | continue; |
| 1405 | if (!test(old, data)) |
| 1406 | continue; |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 1407 | spin_lock(&old->i_lock); |
| 1408 | if (old->i_state & (I_FREEING|I_WILL_FREE)) { |
| 1409 | spin_unlock(&old->i_lock); |
Al Viro | 72a43d6 | 2009-05-13 19:13:40 +0100 | [diff] [blame] | 1410 | continue; |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 1411 | } |
Al Viro | 72a43d6 | 2009-05-13 19:13:40 +0100 | [diff] [blame] | 1412 | break; |
| 1413 | } |
Sasha Levin | b67bfe0 | 2013-02-27 17:06:00 -0800 | [diff] [blame] | 1414 | if (likely(!old)) { |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 1415 | spin_lock(&inode->i_lock); |
| 1416 | inode->i_state |= I_NEW; |
Al Viro | 261bca8 | 2008-12-30 01:48:21 -0500 | [diff] [blame] | 1417 | hlist_add_head(&inode->i_hash, head); |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 1418 | spin_unlock(&inode->i_lock); |
Dave Chinner | 67a23c4 | 2011-03-22 22:23:42 +1100 | [diff] [blame] | 1419 | spin_unlock(&inode_hash_lock); |
Al Viro | 261bca8 | 2008-12-30 01:48:21 -0500 | [diff] [blame] | 1420 | return 0; |
| 1421 | } |
| 1422 | __iget(old); |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 1423 | spin_unlock(&old->i_lock); |
Dave Chinner | 67a23c4 | 2011-03-22 22:23:42 +1100 | [diff] [blame] | 1424 | spin_unlock(&inode_hash_lock); |
Al Viro | 261bca8 | 2008-12-30 01:48:21 -0500 | [diff] [blame] | 1425 | wait_on_inode(old); |
Al Viro | 1d3382cb | 2010-10-23 15:19:20 -0400 | [diff] [blame] | 1426 | if (unlikely(!inode_unhashed(old))) { |
Al Viro | 261bca8 | 2008-12-30 01:48:21 -0500 | [diff] [blame] | 1427 | iput(old); |
| 1428 | return -EBUSY; |
| 1429 | } |
| 1430 | iput(old); |
| 1431 | } |
| 1432 | } |
Al Viro | 261bca8 | 2008-12-30 01:48:21 -0500 | [diff] [blame] | 1433 | EXPORT_SYMBOL(insert_inode_locked4); |
| 1434 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1435 | |
Al Viro | 45321ac | 2010-06-07 13:43:19 -0400 | [diff] [blame] | 1436 | int generic_delete_inode(struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1437 | { |
Al Viro | 45321ac | 2010-06-07 13:43:19 -0400 | [diff] [blame] | 1438 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1439 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1440 | EXPORT_SYMBOL(generic_delete_inode); |
| 1441 | |
Al Viro | 45321ac | 2010-06-07 13:43:19 -0400 | [diff] [blame] | 1442 | /* |
Al Viro | 45321ac | 2010-06-07 13:43:19 -0400 | [diff] [blame] | 1443 | * Called when we're dropping the last reference |
| 1444 | * to an inode. |
| 1445 | * |
| 1446 | * Call the FS "drop_inode()" function, defaulting to |
| 1447 | * the legacy UNIX filesystem behaviour. If it tells |
| 1448 | * us to evict inode, do so. Otherwise, retain inode |
| 1449 | * in cache if fs is alive, sync and evict if fs is |
| 1450 | * shutting down. |
| 1451 | */ |
| 1452 | static void iput_final(struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1453 | { |
| 1454 | struct super_block *sb = inode->i_sb; |
Al Viro | 45321ac | 2010-06-07 13:43:19 -0400 | [diff] [blame] | 1455 | const struct super_operations *op = inode->i_sb->s_op; |
| 1456 | int drop; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1457 | |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 1458 | WARN_ON(inode->i_state & I_NEW); |
| 1459 | |
Al Viro | e7f5909 | 2011-07-07 15:45:59 -0400 | [diff] [blame] | 1460 | if (op->drop_inode) |
Al Viro | 45321ac | 2010-06-07 13:43:19 -0400 | [diff] [blame] | 1461 | drop = op->drop_inode(inode); |
| 1462 | else |
| 1463 | drop = generic_drop_inode(inode); |
| 1464 | |
Dave Chinner | b2b2af8 | 2011-03-22 22:23:37 +1100 | [diff] [blame] | 1465 | if (!drop && (sb->s_flags & MS_ACTIVE)) { |
| 1466 | inode->i_state |= I_REFERENCED; |
Jan Kara | 4eff96d | 2012-11-26 16:29:51 -0800 | [diff] [blame] | 1467 | inode_add_lru(inode); |
Dave Chinner | b2b2af8 | 2011-03-22 22:23:37 +1100 | [diff] [blame] | 1468 | spin_unlock(&inode->i_lock); |
Dave Chinner | b2b2af8 | 2011-03-22 22:23:37 +1100 | [diff] [blame] | 1469 | return; |
| 1470 | } |
| 1471 | |
Al Viro | 45321ac | 2010-06-07 13:43:19 -0400 | [diff] [blame] | 1472 | if (!drop) { |
Alexander Viro | 991114c | 2005-06-23 00:09:01 -0700 | [diff] [blame] | 1473 | inode->i_state |= I_WILL_FREE; |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 1474 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1475 | write_inode_now(inode, 1); |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 1476 | spin_lock(&inode->i_lock); |
Nick Piggin | 7ef0d73 | 2009-03-12 14:31:38 -0700 | [diff] [blame] | 1477 | WARN_ON(inode->i_state & I_NEW); |
Alexander Viro | 991114c | 2005-06-23 00:09:01 -0700 | [diff] [blame] | 1478 | inode->i_state &= ~I_WILL_FREE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1479 | } |
Nick Piggin | 7ccf19a | 2010-10-21 11:49:30 +1100 | [diff] [blame] | 1480 | |
Alexander Viro | 991114c | 2005-06-23 00:09:01 -0700 | [diff] [blame] | 1481 | inode->i_state |= I_FREEING; |
Eric Dumazet | c4ae0c6 | 2011-07-28 06:55:13 +0200 | [diff] [blame] | 1482 | if (!list_empty(&inode->i_lru)) |
| 1483 | inode_lru_list_del(inode); |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 1484 | spin_unlock(&inode->i_lock); |
Dave Chinner | b2b2af8 | 2011-03-22 22:23:37 +1100 | [diff] [blame] | 1485 | |
| 1486 | evict(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1487 | } |
| 1488 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1489 | /** |
Manish Katiyar | 6b3304b | 2009-03-31 19:35:54 +0530 | [diff] [blame] | 1490 | * iput - put an inode |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1491 | * @inode: inode to put |
| 1492 | * |
| 1493 | * Puts an inode, dropping its usage count. If the inode use count hits |
| 1494 | * zero, the inode is then freed and may also be destroyed. |
| 1495 | * |
| 1496 | * Consequently, iput() can sleep. |
| 1497 | */ |
| 1498 | void iput(struct inode *inode) |
| 1499 | { |
Theodore Ts'o | 0ae45f6 | 2015-02-02 00:37:00 -0500 | [diff] [blame] | 1500 | if (!inode) |
| 1501 | return; |
| 1502 | BUG_ON(inode->i_state & I_CLEAR); |
| 1503 | retry: |
| 1504 | if (atomic_dec_and_lock(&inode->i_count, &inode->i_lock)) { |
| 1505 | if (inode->i_nlink && (inode->i_state & I_DIRTY_TIME)) { |
| 1506 | atomic_inc(&inode->i_count); |
| 1507 | inode->i_state &= ~I_DIRTY_TIME; |
| 1508 | spin_unlock(&inode->i_lock); |
| 1509 | trace_writeback_lazytime_iput(inode); |
| 1510 | mark_inode_dirty_sync(inode); |
| 1511 | goto retry; |
| 1512 | } |
| 1513 | iput_final(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1514 | } |
| 1515 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1516 | EXPORT_SYMBOL(iput); |
| 1517 | |
| 1518 | /** |
| 1519 | * bmap - find a block number in a file |
| 1520 | * @inode: inode of file |
| 1521 | * @block: block to find |
| 1522 | * |
| 1523 | * Returns the block number on the device holding the inode that |
| 1524 | * is the disk block number for the block of the file requested. |
| 1525 | * That is, asked for block 4 of inode 1 the function will return the |
Manish Katiyar | 6b3304b | 2009-03-31 19:35:54 +0530 | [diff] [blame] | 1526 | * disk block relative to the disk start that holds that block of the |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1527 | * file. |
| 1528 | */ |
Manish Katiyar | 6b3304b | 2009-03-31 19:35:54 +0530 | [diff] [blame] | 1529 | sector_t bmap(struct inode *inode, sector_t block) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1530 | { |
| 1531 | sector_t res = 0; |
| 1532 | if (inode->i_mapping->a_ops->bmap) |
| 1533 | res = inode->i_mapping->a_ops->bmap(inode->i_mapping, block); |
| 1534 | return res; |
| 1535 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1536 | EXPORT_SYMBOL(bmap); |
| 1537 | |
Matthew Garrett | 11ff6f05 | 2009-03-26 17:32:14 +0000 | [diff] [blame] | 1538 | /* |
| 1539 | * With relative atime, only update atime if the previous atime is |
| 1540 | * earlier than either the ctime or mtime or if at least a day has |
| 1541 | * passed since the last atime update. |
| 1542 | */ |
| 1543 | static int relatime_need_update(struct vfsmount *mnt, struct inode *inode, |
| 1544 | struct timespec now) |
| 1545 | { |
| 1546 | |
| 1547 | if (!(mnt->mnt_flags & MNT_RELATIME)) |
| 1548 | return 1; |
| 1549 | /* |
| 1550 | * Is mtime younger than atime? If yes, update atime: |
| 1551 | */ |
| 1552 | if (timespec_compare(&inode->i_mtime, &inode->i_atime) >= 0) |
| 1553 | return 1; |
| 1554 | /* |
| 1555 | * Is ctime younger than atime? If yes, update atime: |
| 1556 | */ |
| 1557 | if (timespec_compare(&inode->i_ctime, &inode->i_atime) >= 0) |
| 1558 | return 1; |
| 1559 | |
| 1560 | /* |
| 1561 | * Is the previous atime value older than a day? If yes, |
| 1562 | * update atime: |
| 1563 | */ |
| 1564 | if ((long)(now.tv_sec - inode->i_atime.tv_sec) >= 24*60*60) |
| 1565 | return 1; |
| 1566 | /* |
| 1567 | * Good, we can skip the atime update: |
| 1568 | */ |
| 1569 | return 0; |
| 1570 | } |
| 1571 | |
Theodore Ts'o | 0ae45f6 | 2015-02-02 00:37:00 -0500 | [diff] [blame] | 1572 | int generic_update_time(struct inode *inode, struct timespec *time, int flags) |
Josef Bacik | c3b2da3 | 2012-03-26 09:59:21 -0400 | [diff] [blame] | 1573 | { |
Theodore Ts'o | 0ae45f6 | 2015-02-02 00:37:00 -0500 | [diff] [blame] | 1574 | int iflags = I_DIRTY_TIME; |
Josef Bacik | c3b2da3 | 2012-03-26 09:59:21 -0400 | [diff] [blame] | 1575 | |
| 1576 | if (flags & S_ATIME) |
| 1577 | inode->i_atime = *time; |
| 1578 | if (flags & S_VERSION) |
| 1579 | inode_inc_iversion(inode); |
| 1580 | if (flags & S_CTIME) |
| 1581 | inode->i_ctime = *time; |
| 1582 | if (flags & S_MTIME) |
| 1583 | inode->i_mtime = *time; |
Theodore Ts'o | 0ae45f6 | 2015-02-02 00:37:00 -0500 | [diff] [blame] | 1584 | |
| 1585 | if (!(inode->i_sb->s_flags & MS_LAZYTIME) || (flags & S_VERSION)) |
| 1586 | iflags |= I_DIRTY_SYNC; |
| 1587 | __mark_inode_dirty(inode, iflags); |
Josef Bacik | c3b2da3 | 2012-03-26 09:59:21 -0400 | [diff] [blame] | 1588 | return 0; |
| 1589 | } |
Theodore Ts'o | 0ae45f6 | 2015-02-02 00:37:00 -0500 | [diff] [blame] | 1590 | EXPORT_SYMBOL(generic_update_time); |
| 1591 | |
| 1592 | /* |
| 1593 | * This does the actual work of updating an inodes time or version. Must have |
| 1594 | * had called mnt_want_write() before calling this. |
| 1595 | */ |
| 1596 | static int update_time(struct inode *inode, struct timespec *time, int flags) |
| 1597 | { |
| 1598 | int (*update_time)(struct inode *, struct timespec *, int); |
| 1599 | |
| 1600 | update_time = inode->i_op->update_time ? inode->i_op->update_time : |
| 1601 | generic_update_time; |
| 1602 | |
| 1603 | return update_time(inode, time, flags); |
| 1604 | } |
Josef Bacik | c3b2da3 | 2012-03-26 09:59:21 -0400 | [diff] [blame] | 1605 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1606 | /** |
Christoph Hellwig | 869243a | 2006-01-09 20:52:03 -0800 | [diff] [blame] | 1607 | * touch_atime - update the access time |
Randy Dunlap | 185553b | 2012-04-17 17:03:25 -0700 | [diff] [blame] | 1608 | * @path: the &struct path to update |
Randy Dunlap | 30fdc8e | 2015-11-09 14:57:58 -0800 | [diff] [blame] | 1609 | * @inode: inode to update |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1610 | * |
| 1611 | * Update the accessed time on an inode and mark it for writeback. |
| 1612 | * This function automatically handles read only file systems and media, |
| 1613 | * as well as the "noatime" flag and inode specific "noatime" markers. |
| 1614 | */ |
NeilBrown | 8fa9dd2 | 2015-03-23 13:37:40 +1100 | [diff] [blame] | 1615 | bool atime_needs_update(const struct path *path, struct inode *inode) |
| 1616 | { |
| 1617 | struct vfsmount *mnt = path->mnt; |
| 1618 | struct timespec now; |
| 1619 | |
| 1620 | if (inode->i_flags & S_NOATIME) |
| 1621 | return false; |
Eric W. Biederman | 0bd23d09 | 2016-06-29 14:54:46 -0500 | [diff] [blame] | 1622 | |
| 1623 | /* Atime updates will likely cause i_uid and i_gid to be written |
| 1624 | * back improprely if their true value is unknown to the vfs. |
| 1625 | */ |
| 1626 | if (HAS_UNMAPPED_ID(inode)) |
| 1627 | return false; |
| 1628 | |
NeilBrown | 8fa9dd2 | 2015-03-23 13:37:40 +1100 | [diff] [blame] | 1629 | if (IS_NOATIME(inode)) |
| 1630 | return false; |
| 1631 | if ((inode->i_sb->s_flags & MS_NODIRATIME) && S_ISDIR(inode->i_mode)) |
| 1632 | return false; |
| 1633 | |
| 1634 | if (mnt->mnt_flags & MNT_NOATIME) |
| 1635 | return false; |
| 1636 | if ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)) |
| 1637 | return false; |
| 1638 | |
| 1639 | now = current_fs_time(inode->i_sb); |
| 1640 | |
| 1641 | if (!relatime_need_update(mnt, inode, now)) |
| 1642 | return false; |
| 1643 | |
| 1644 | if (timespec_equal(&inode->i_atime, &now)) |
| 1645 | return false; |
| 1646 | |
| 1647 | return true; |
| 1648 | } |
| 1649 | |
Al Viro | badcf2b | 2013-07-16 18:15:46 +0400 | [diff] [blame] | 1650 | void touch_atime(const struct path *path) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1651 | { |
Al Viro | 68ac123 | 2012-03-15 08:21:57 -0400 | [diff] [blame] | 1652 | struct vfsmount *mnt = path->mnt; |
David Howells | df2b1af | 2015-03-17 22:26:15 +0000 | [diff] [blame] | 1653 | struct inode *inode = d_inode(path->dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1654 | struct timespec now; |
| 1655 | |
NeilBrown | 8fa9dd2 | 2015-03-23 13:37:40 +1100 | [diff] [blame] | 1656 | if (!atime_needs_update(path, inode)) |
Andi Kleen | b12536c | 2009-09-18 13:05:47 -0700 | [diff] [blame] | 1657 | return; |
| 1658 | |
Jan Kara | 5d37e9e | 2012-06-12 16:20:36 +0200 | [diff] [blame] | 1659 | if (!sb_start_write_trylock(inode->i_sb)) |
Andi Kleen | b12536c | 2009-09-18 13:05:47 -0700 | [diff] [blame] | 1660 | return; |
Valerie Henson | 47ae32d | 2006-12-13 00:34:34 -0800 | [diff] [blame] | 1661 | |
NeilBrown | 8fa9dd2 | 2015-03-23 13:37:40 +1100 | [diff] [blame] | 1662 | if (__mnt_want_write(mnt) != 0) |
Jan Kara | 5d37e9e | 2012-06-12 16:20:36 +0200 | [diff] [blame] | 1663 | goto skip_update; |
Josef Bacik | c3b2da3 | 2012-03-26 09:59:21 -0400 | [diff] [blame] | 1664 | /* |
| 1665 | * File systems can error out when updating inodes if they need to |
| 1666 | * allocate new space to modify an inode (such is the case for |
| 1667 | * Btrfs), but since we touch atime while walking down the path we |
| 1668 | * really don't care if we failed to update the atime of the file, |
| 1669 | * so just ignore the return value. |
Alexander Block | 2bc556528 | 2012-06-15 09:49:33 +0200 | [diff] [blame] | 1670 | * We may also fail on filesystems that have the ability to make parts |
| 1671 | * of the fs read only, e.g. subvolumes in Btrfs. |
Josef Bacik | c3b2da3 | 2012-03-26 09:59:21 -0400 | [diff] [blame] | 1672 | */ |
NeilBrown | 8fa9dd2 | 2015-03-23 13:37:40 +1100 | [diff] [blame] | 1673 | now = current_fs_time(inode->i_sb); |
Josef Bacik | c3b2da3 | 2012-03-26 09:59:21 -0400 | [diff] [blame] | 1674 | update_time(inode, &now, S_ATIME); |
Jan Kara | 5d37e9e | 2012-06-12 16:20:36 +0200 | [diff] [blame] | 1675 | __mnt_drop_write(mnt); |
| 1676 | skip_update: |
| 1677 | sb_end_write(inode->i_sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1678 | } |
Christoph Hellwig | 869243a | 2006-01-09 20:52:03 -0800 | [diff] [blame] | 1679 | EXPORT_SYMBOL(touch_atime); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1680 | |
Cong Wang | 3ed3764 | 2012-05-15 14:57:33 +0800 | [diff] [blame] | 1681 | /* |
| 1682 | * The logic we want is |
| 1683 | * |
| 1684 | * if suid or (sgid and xgrp) |
| 1685 | * remove privs |
| 1686 | */ |
| 1687 | int should_remove_suid(struct dentry *dentry) |
| 1688 | { |
David Howells | df2b1af | 2015-03-17 22:26:15 +0000 | [diff] [blame] | 1689 | umode_t mode = d_inode(dentry)->i_mode; |
Cong Wang | 3ed3764 | 2012-05-15 14:57:33 +0800 | [diff] [blame] | 1690 | int kill = 0; |
| 1691 | |
| 1692 | /* suid always must be killed */ |
| 1693 | if (unlikely(mode & S_ISUID)) |
| 1694 | kill = ATTR_KILL_SUID; |
| 1695 | |
| 1696 | /* |
| 1697 | * sgid without any exec bits is just a mandatory locking mark; leave |
| 1698 | * it alone. If some exec bits are set, it's a real sgid; kill it. |
| 1699 | */ |
| 1700 | if (unlikely((mode & S_ISGID) && (mode & S_IXGRP))) |
| 1701 | kill |= ATTR_KILL_SGID; |
| 1702 | |
| 1703 | if (unlikely(kill && !capable(CAP_FSETID) && S_ISREG(mode))) |
| 1704 | return kill; |
| 1705 | |
| 1706 | return 0; |
| 1707 | } |
| 1708 | EXPORT_SYMBOL(should_remove_suid); |
| 1709 | |
Jan Kara | dbfae0c | 2015-05-21 16:05:54 +0200 | [diff] [blame] | 1710 | /* |
| 1711 | * Return mask of changes for notify_change() that need to be done as a |
| 1712 | * response to write or truncate. Return 0 if nothing has to be changed. |
| 1713 | * Negative value on error (change should be denied). |
| 1714 | */ |
Jan Kara | 45f147a | 2015-05-21 16:05:55 +0200 | [diff] [blame] | 1715 | int dentry_needs_remove_privs(struct dentry *dentry) |
Jan Kara | dbfae0c | 2015-05-21 16:05:54 +0200 | [diff] [blame] | 1716 | { |
Jan Kara | dbfae0c | 2015-05-21 16:05:54 +0200 | [diff] [blame] | 1717 | struct inode *inode = d_inode(dentry); |
| 1718 | int mask = 0; |
| 1719 | int ret; |
| 1720 | |
| 1721 | if (IS_NOSEC(inode)) |
| 1722 | return 0; |
| 1723 | |
| 1724 | mask = should_remove_suid(dentry); |
| 1725 | ret = security_inode_need_killpriv(dentry); |
| 1726 | if (ret < 0) |
| 1727 | return ret; |
| 1728 | if (ret) |
| 1729 | mask |= ATTR_KILL_PRIV; |
| 1730 | return mask; |
| 1731 | } |
Jan Kara | 45f147a | 2015-05-21 16:05:55 +0200 | [diff] [blame] | 1732 | EXPORT_SYMBOL(dentry_needs_remove_privs); |
Jan Kara | dbfae0c | 2015-05-21 16:05:54 +0200 | [diff] [blame] | 1733 | |
| 1734 | static int __remove_privs(struct dentry *dentry, int kill) |
Cong Wang | 3ed3764 | 2012-05-15 14:57:33 +0800 | [diff] [blame] | 1735 | { |
| 1736 | struct iattr newattrs; |
| 1737 | |
| 1738 | newattrs.ia_valid = ATTR_FORCE | kill; |
J. Bruce Fields | 27ac0ff | 2011-09-20 17:19:26 -0400 | [diff] [blame] | 1739 | /* |
| 1740 | * Note we call this on write, so notify_change will not |
| 1741 | * encounter any conflicting delegations: |
| 1742 | */ |
| 1743 | return notify_change(dentry, &newattrs, NULL); |
Cong Wang | 3ed3764 | 2012-05-15 14:57:33 +0800 | [diff] [blame] | 1744 | } |
| 1745 | |
Jan Kara | 5fa8e0a | 2015-05-21 16:05:53 +0200 | [diff] [blame] | 1746 | /* |
| 1747 | * Remove special file priviledges (suid, capabilities) when file is written |
| 1748 | * to or truncated. |
| 1749 | */ |
| 1750 | int file_remove_privs(struct file *file) |
Cong Wang | 3ed3764 | 2012-05-15 14:57:33 +0800 | [diff] [blame] | 1751 | { |
| 1752 | struct dentry *dentry = file->f_path.dentry; |
David Howells | df2b1af | 2015-03-17 22:26:15 +0000 | [diff] [blame] | 1753 | struct inode *inode = d_inode(dentry); |
Jan Kara | dbfae0c | 2015-05-21 16:05:54 +0200 | [diff] [blame] | 1754 | int kill; |
Cong Wang | 3ed3764 | 2012-05-15 14:57:33 +0800 | [diff] [blame] | 1755 | int error = 0; |
| 1756 | |
| 1757 | /* Fast path for nothing security related */ |
| 1758 | if (IS_NOSEC(inode)) |
| 1759 | return 0; |
| 1760 | |
Jan Kara | dbfae0c | 2015-05-21 16:05:54 +0200 | [diff] [blame] | 1761 | kill = file_needs_remove_privs(file); |
| 1762 | if (kill < 0) |
| 1763 | return kill; |
| 1764 | if (kill) |
| 1765 | error = __remove_privs(dentry, kill); |
Jan Kara | 2426f39 | 2015-05-21 16:05:52 +0200 | [diff] [blame] | 1766 | if (!error) |
| 1767 | inode_has_no_xattr(inode); |
Cong Wang | 3ed3764 | 2012-05-15 14:57:33 +0800 | [diff] [blame] | 1768 | |
| 1769 | return error; |
| 1770 | } |
Jan Kara | 5fa8e0a | 2015-05-21 16:05:53 +0200 | [diff] [blame] | 1771 | EXPORT_SYMBOL(file_remove_privs); |
Cong Wang | 3ed3764 | 2012-05-15 14:57:33 +0800 | [diff] [blame] | 1772 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1773 | /** |
Christoph Hellwig | 870f481 | 2006-01-09 20:52:01 -0800 | [diff] [blame] | 1774 | * file_update_time - update mtime and ctime time |
| 1775 | * @file: file accessed |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1776 | * |
Christoph Hellwig | 870f481 | 2006-01-09 20:52:01 -0800 | [diff] [blame] | 1777 | * Update the mtime and ctime members of an inode and mark the inode |
| 1778 | * for writeback. Note that this function is meant exclusively for |
| 1779 | * usage in the file write path of filesystems, and filesystems may |
| 1780 | * choose to explicitly ignore update via this function with the |
Wolfram Sang | 2eadfc0 | 2009-04-02 15:23:37 +0200 | [diff] [blame] | 1781 | * S_NOCMTIME inode flag, e.g. for network filesystem where these |
Josef Bacik | c3b2da3 | 2012-03-26 09:59:21 -0400 | [diff] [blame] | 1782 | * timestamps are handled by the server. This can return an error for |
| 1783 | * file systems who need to allocate space in order to update an inode. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1784 | */ |
| 1785 | |
Josef Bacik | c3b2da3 | 2012-03-26 09:59:21 -0400 | [diff] [blame] | 1786 | int file_update_time(struct file *file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1787 | { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1788 | struct inode *inode = file_inode(file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1789 | struct timespec now; |
Josef Bacik | c3b2da3 | 2012-03-26 09:59:21 -0400 | [diff] [blame] | 1790 | int sync_it = 0; |
| 1791 | int ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1792 | |
Andi Kleen | ce06e0b | 2009-09-18 13:05:48 -0700 | [diff] [blame] | 1793 | /* First try to exhaust all avenues to not sync */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1794 | if (IS_NOCMTIME(inode)) |
Josef Bacik | c3b2da3 | 2012-03-26 09:59:21 -0400 | [diff] [blame] | 1795 | return 0; |
Dave Hansen | 20ddee2 | 2008-02-15 14:37:43 -0800 | [diff] [blame] | 1796 | |
Andi Kleen | ce06e0b | 2009-09-18 13:05:48 -0700 | [diff] [blame] | 1797 | now = current_fs_time(inode->i_sb); |
| 1798 | if (!timespec_equal(&inode->i_mtime, &now)) |
| 1799 | sync_it = S_MTIME; |
| 1800 | |
| 1801 | if (!timespec_equal(&inode->i_ctime, &now)) |
| 1802 | sync_it |= S_CTIME; |
| 1803 | |
| 1804 | if (IS_I_VERSION(inode)) |
| 1805 | sync_it |= S_VERSION; |
| 1806 | |
| 1807 | if (!sync_it) |
Josef Bacik | c3b2da3 | 2012-03-26 09:59:21 -0400 | [diff] [blame] | 1808 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1809 | |
Andi Kleen | ce06e0b | 2009-09-18 13:05:48 -0700 | [diff] [blame] | 1810 | /* Finally allowed to write? Takes lock. */ |
Jan Kara | eb04c28 | 2012-06-12 16:20:35 +0200 | [diff] [blame] | 1811 | if (__mnt_want_write_file(file)) |
Josef Bacik | c3b2da3 | 2012-03-26 09:59:21 -0400 | [diff] [blame] | 1812 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1813 | |
Josef Bacik | c3b2da3 | 2012-03-26 09:59:21 -0400 | [diff] [blame] | 1814 | ret = update_time(inode, &now, sync_it); |
Jan Kara | eb04c28 | 2012-06-12 16:20:35 +0200 | [diff] [blame] | 1815 | __mnt_drop_write_file(file); |
Josef Bacik | c3b2da3 | 2012-03-26 09:59:21 -0400 | [diff] [blame] | 1816 | |
| 1817 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1818 | } |
Christoph Hellwig | 870f481 | 2006-01-09 20:52:01 -0800 | [diff] [blame] | 1819 | EXPORT_SYMBOL(file_update_time); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1820 | |
| 1821 | int inode_needs_sync(struct inode *inode) |
| 1822 | { |
| 1823 | if (IS_SYNC(inode)) |
| 1824 | return 1; |
| 1825 | if (S_ISDIR(inode->i_mode) && IS_DIRSYNC(inode)) |
| 1826 | return 1; |
| 1827 | return 0; |
| 1828 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1829 | EXPORT_SYMBOL(inode_needs_sync); |
| 1830 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1831 | /* |
Miklos Szeredi | 168a9fd | 2005-07-12 13:58:10 -0700 | [diff] [blame] | 1832 | * If we try to find an inode in the inode hash while it is being |
| 1833 | * deleted, we have to wait until the filesystem completes its |
| 1834 | * deletion before reporting that it isn't found. This function waits |
| 1835 | * until the deletion _might_ have completed. Callers are responsible |
| 1836 | * to recheck inode state. |
| 1837 | * |
Christoph Hellwig | eaff807 | 2009-12-17 14:25:01 +0100 | [diff] [blame] | 1838 | * It doesn't matter if I_NEW is not set initially, a call to |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 1839 | * wake_up_bit(&inode->i_state, __I_NEW) after removing from the hash list |
| 1840 | * will DTRT. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1841 | */ |
| 1842 | static void __wait_on_freeing_inode(struct inode *inode) |
| 1843 | { |
| 1844 | wait_queue_head_t *wq; |
Christoph Hellwig | eaff807 | 2009-12-17 14:25:01 +0100 | [diff] [blame] | 1845 | DEFINE_WAIT_BIT(wait, &inode->i_state, __I_NEW); |
| 1846 | wq = bit_waitqueue(&inode->i_state, __I_NEW); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1847 | prepare_to_wait(wq, &wait.wait, TASK_UNINTERRUPTIBLE); |
Dave Chinner | 250df6e | 2011-03-22 22:23:36 +1100 | [diff] [blame] | 1848 | spin_unlock(&inode->i_lock); |
Dave Chinner | 67a23c4 | 2011-03-22 22:23:42 +1100 | [diff] [blame] | 1849 | spin_unlock(&inode_hash_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1850 | schedule(); |
| 1851 | finish_wait(wq, &wait.wait); |
Dave Chinner | 67a23c4 | 2011-03-22 22:23:42 +1100 | [diff] [blame] | 1852 | spin_lock(&inode_hash_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1853 | } |
| 1854 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1855 | static __initdata unsigned long ihash_entries; |
| 1856 | static int __init set_ihash_entries(char *str) |
| 1857 | { |
| 1858 | if (!str) |
| 1859 | return 0; |
| 1860 | ihash_entries = simple_strtoul(str, &str, 0); |
| 1861 | return 1; |
| 1862 | } |
| 1863 | __setup("ihash_entries=", set_ihash_entries); |
| 1864 | |
| 1865 | /* |
| 1866 | * Initialize the waitqueues and inode hash table. |
| 1867 | */ |
| 1868 | void __init inode_init_early(void) |
| 1869 | { |
Dimitri Sivanich | 074b851 | 2012-02-08 12:39:07 -0800 | [diff] [blame] | 1870 | unsigned int loop; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1871 | |
| 1872 | /* If hashes are distributed across NUMA nodes, defer |
| 1873 | * hash allocation until vmalloc space is available. |
| 1874 | */ |
| 1875 | if (hashdist) |
| 1876 | return; |
| 1877 | |
| 1878 | inode_hashtable = |
| 1879 | alloc_large_system_hash("Inode-cache", |
| 1880 | sizeof(struct hlist_head), |
| 1881 | ihash_entries, |
| 1882 | 14, |
| 1883 | HASH_EARLY, |
| 1884 | &i_hash_shift, |
| 1885 | &i_hash_mask, |
Tim Bird | 31fe62b | 2012-05-23 13:33:35 +0000 | [diff] [blame] | 1886 | 0, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1887 | 0); |
| 1888 | |
Dimitri Sivanich | 074b851 | 2012-02-08 12:39:07 -0800 | [diff] [blame] | 1889 | for (loop = 0; loop < (1U << i_hash_shift); loop++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1890 | INIT_HLIST_HEAD(&inode_hashtable[loop]); |
| 1891 | } |
| 1892 | |
Denis Cheng | 74bf17c | 2007-10-16 23:26:30 -0700 | [diff] [blame] | 1893 | void __init inode_init(void) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1894 | { |
Dimitri Sivanich | 074b851 | 2012-02-08 12:39:07 -0800 | [diff] [blame] | 1895 | unsigned int loop; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1896 | |
| 1897 | /* inode slab cache */ |
Paul Jackson | b019600 | 2006-03-24 03:16:09 -0800 | [diff] [blame] | 1898 | inode_cachep = kmem_cache_create("inode_cache", |
| 1899 | sizeof(struct inode), |
| 1900 | 0, |
| 1901 | (SLAB_RECLAIM_ACCOUNT|SLAB_PANIC| |
Vladimir Davydov | 5d09705 | 2016-01-14 15:18:21 -0800 | [diff] [blame] | 1902 | SLAB_MEM_SPREAD|SLAB_ACCOUNT), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 1903 | init_once); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1904 | |
| 1905 | /* Hash may have been set up in inode_init_early */ |
| 1906 | if (!hashdist) |
| 1907 | return; |
| 1908 | |
| 1909 | inode_hashtable = |
| 1910 | alloc_large_system_hash("Inode-cache", |
| 1911 | sizeof(struct hlist_head), |
| 1912 | ihash_entries, |
| 1913 | 14, |
| 1914 | 0, |
| 1915 | &i_hash_shift, |
| 1916 | &i_hash_mask, |
Tim Bird | 31fe62b | 2012-05-23 13:33:35 +0000 | [diff] [blame] | 1917 | 0, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1918 | 0); |
| 1919 | |
Dimitri Sivanich | 074b851 | 2012-02-08 12:39:07 -0800 | [diff] [blame] | 1920 | for (loop = 0; loop < (1U << i_hash_shift); loop++) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1921 | INIT_HLIST_HEAD(&inode_hashtable[loop]); |
| 1922 | } |
| 1923 | |
| 1924 | void init_special_inode(struct inode *inode, umode_t mode, dev_t rdev) |
| 1925 | { |
| 1926 | inode->i_mode = mode; |
| 1927 | if (S_ISCHR(mode)) { |
| 1928 | inode->i_fop = &def_chr_fops; |
| 1929 | inode->i_rdev = rdev; |
| 1930 | } else if (S_ISBLK(mode)) { |
| 1931 | inode->i_fop = &def_blk_fops; |
| 1932 | inode->i_rdev = rdev; |
| 1933 | } else if (S_ISFIFO(mode)) |
Al Viro | 599a0ac | 2013-03-12 09:58:10 -0400 | [diff] [blame] | 1934 | inode->i_fop = &pipefifo_fops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1935 | else if (S_ISSOCK(mode)) |
Al Viro | bd9b51e | 2014-11-18 23:38:21 -0500 | [diff] [blame] | 1936 | ; /* leave it no_open_fops */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1937 | else |
Manish Katiyar | af0d9ae | 2009-09-18 13:05:43 -0700 | [diff] [blame] | 1938 | printk(KERN_DEBUG "init_special_inode: bogus i_mode (%o) for" |
| 1939 | " inode %s:%lu\n", mode, inode->i_sb->s_id, |
| 1940 | inode->i_ino); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1941 | } |
| 1942 | EXPORT_SYMBOL(init_special_inode); |
Dmitry Monakhov | a1bd120 | 2010-03-04 17:29:14 +0300 | [diff] [blame] | 1943 | |
| 1944 | /** |
Ben Hutchings | eaae668d | 2011-02-15 12:48:09 +0000 | [diff] [blame] | 1945 | * inode_init_owner - Init uid,gid,mode for new inode according to posix standards |
Dmitry Monakhov | a1bd120 | 2010-03-04 17:29:14 +0300 | [diff] [blame] | 1946 | * @inode: New inode |
| 1947 | * @dir: Directory inode |
| 1948 | * @mode: mode of the new inode |
| 1949 | */ |
| 1950 | void inode_init_owner(struct inode *inode, const struct inode *dir, |
Al Viro | 62bb109 | 2011-07-24 23:20:18 -0400 | [diff] [blame] | 1951 | umode_t mode) |
Dmitry Monakhov | a1bd120 | 2010-03-04 17:29:14 +0300 | [diff] [blame] | 1952 | { |
| 1953 | inode->i_uid = current_fsuid(); |
| 1954 | if (dir && dir->i_mode & S_ISGID) { |
| 1955 | inode->i_gid = dir->i_gid; |
| 1956 | if (S_ISDIR(mode)) |
| 1957 | mode |= S_ISGID; |
| 1958 | } else |
| 1959 | inode->i_gid = current_fsgid(); |
| 1960 | inode->i_mode = mode; |
| 1961 | } |
| 1962 | EXPORT_SYMBOL(inode_init_owner); |
Serge E. Hallyn | e795b71 | 2011-03-23 16:43:25 -0700 | [diff] [blame] | 1963 | |
Serge E. Hallyn | 2e14967 | 2011-03-23 16:43:26 -0700 | [diff] [blame] | 1964 | /** |
| 1965 | * inode_owner_or_capable - check current task permissions to inode |
| 1966 | * @inode: inode being checked |
| 1967 | * |
Andy Lutomirski | 23adbe1 | 2014-06-10 12:45:42 -0700 | [diff] [blame] | 1968 | * Return true if current either has CAP_FOWNER in a namespace with the |
| 1969 | * inode owner uid mapped, or owns the file. |
Serge E. Hallyn | e795b71 | 2011-03-23 16:43:25 -0700 | [diff] [blame] | 1970 | */ |
Serge E. Hallyn | 2e14967 | 2011-03-23 16:43:26 -0700 | [diff] [blame] | 1971 | bool inode_owner_or_capable(const struct inode *inode) |
Serge E. Hallyn | e795b71 | 2011-03-23 16:43:25 -0700 | [diff] [blame] | 1972 | { |
Andy Lutomirski | 23adbe1 | 2014-06-10 12:45:42 -0700 | [diff] [blame] | 1973 | struct user_namespace *ns; |
| 1974 | |
Eric W. Biederman | 9236163 | 2012-02-08 07:07:50 -0800 | [diff] [blame] | 1975 | if (uid_eq(current_fsuid(), inode->i_uid)) |
Serge E. Hallyn | e795b71 | 2011-03-23 16:43:25 -0700 | [diff] [blame] | 1976 | return true; |
Andy Lutomirski | 23adbe1 | 2014-06-10 12:45:42 -0700 | [diff] [blame] | 1977 | |
| 1978 | ns = current_user_ns(); |
| 1979 | if (ns_capable(ns, CAP_FOWNER) && kuid_has_mapping(ns, inode->i_uid)) |
Serge E. Hallyn | e795b71 | 2011-03-23 16:43:25 -0700 | [diff] [blame] | 1980 | return true; |
| 1981 | return false; |
| 1982 | } |
Serge E. Hallyn | 2e14967 | 2011-03-23 16:43:26 -0700 | [diff] [blame] | 1983 | EXPORT_SYMBOL(inode_owner_or_capable); |
Trond Myklebust | 1d59d61 | 2012-05-31 12:22:33 -0400 | [diff] [blame] | 1984 | |
| 1985 | /* |
| 1986 | * Direct i/o helper functions |
| 1987 | */ |
| 1988 | static void __inode_dio_wait(struct inode *inode) |
| 1989 | { |
| 1990 | wait_queue_head_t *wq = bit_waitqueue(&inode->i_state, __I_DIO_WAKEUP); |
| 1991 | DEFINE_WAIT_BIT(q, &inode->i_state, __I_DIO_WAKEUP); |
| 1992 | |
| 1993 | do { |
| 1994 | prepare_to_wait(wq, &q.wait, TASK_UNINTERRUPTIBLE); |
| 1995 | if (atomic_read(&inode->i_dio_count)) |
| 1996 | schedule(); |
| 1997 | } while (atomic_read(&inode->i_dio_count)); |
| 1998 | finish_wait(wq, &q.wait); |
| 1999 | } |
| 2000 | |
| 2001 | /** |
| 2002 | * inode_dio_wait - wait for outstanding DIO requests to finish |
| 2003 | * @inode: inode to wait for |
| 2004 | * |
| 2005 | * Waits for all pending direct I/O requests to finish so that we can |
| 2006 | * proceed with a truncate or equivalent operation. |
| 2007 | * |
| 2008 | * Must be called under a lock that serializes taking new references |
| 2009 | * to i_dio_count, usually by inode->i_mutex. |
| 2010 | */ |
| 2011 | void inode_dio_wait(struct inode *inode) |
| 2012 | { |
| 2013 | if (atomic_read(&inode->i_dio_count)) |
| 2014 | __inode_dio_wait(inode); |
| 2015 | } |
| 2016 | EXPORT_SYMBOL(inode_dio_wait); |
| 2017 | |
| 2018 | /* |
Theodore Ts'o | 5f16f32 | 2014-03-24 14:43:12 -0400 | [diff] [blame] | 2019 | * inode_set_flags - atomically set some inode flags |
| 2020 | * |
| 2021 | * Note: the caller should be holding i_mutex, or else be sure that |
| 2022 | * they have exclusive access to the inode structure (i.e., while the |
| 2023 | * inode is being instantiated). The reason for the cmpxchg() loop |
| 2024 | * --- which wouldn't be necessary if all code paths which modify |
| 2025 | * i_flags actually followed this rule, is that there is at least one |
Jan Kara | 5fa8e0a | 2015-05-21 16:05:53 +0200 | [diff] [blame] | 2026 | * code path which doesn't today so we use cmpxchg() out of an abundance |
| 2027 | * of caution. |
Theodore Ts'o | 5f16f32 | 2014-03-24 14:43:12 -0400 | [diff] [blame] | 2028 | * |
| 2029 | * In the long run, i_mutex is overkill, and we should probably look |
| 2030 | * at using the i_lock spinlock to protect i_flags, and then make sure |
| 2031 | * it is so documented in include/linux/fs.h and that all code follows |
| 2032 | * the locking convention!! |
| 2033 | */ |
| 2034 | void inode_set_flags(struct inode *inode, unsigned int flags, |
| 2035 | unsigned int mask) |
| 2036 | { |
| 2037 | unsigned int old_flags, new_flags; |
| 2038 | |
| 2039 | WARN_ON_ONCE(flags & ~mask); |
| 2040 | do { |
| 2041 | old_flags = ACCESS_ONCE(inode->i_flags); |
| 2042 | new_flags = (old_flags & ~mask) | flags; |
| 2043 | } while (unlikely(cmpxchg(&inode->i_flags, old_flags, |
| 2044 | new_flags) != old_flags)); |
| 2045 | } |
| 2046 | EXPORT_SYMBOL(inode_set_flags); |
Al Viro | 21fc61c | 2015-11-17 01:07:57 -0500 | [diff] [blame] | 2047 | |
| 2048 | void inode_nohighmem(struct inode *inode) |
| 2049 | { |
| 2050 | mapping_set_gfp_mask(inode->i_mapping, GFP_USER); |
| 2051 | } |
| 2052 | EXPORT_SYMBOL(inode_nohighmem); |