Blame view
fs/inode.c
60.8 KB
457c89965 treewide: Add SPD... |
1 |
// SPDX-License-Identifier: GPL-2.0-only |
1da177e4c Linux-2.6.12-rc2 |
2 |
/* |
1da177e4c Linux-2.6.12-rc2 |
3 |
* (C) 1997 Linus Torvalds |
4b4563dc8 fs: cosmetic inod... |
4 |
* (C) 1999 Andrea Arcangeli <andrea@suse.de> (dynamic inode allocation) |
1da177e4c Linux-2.6.12-rc2 |
5 |
*/ |
e59cc473c trim includes in ... |
6 |
#include <linux/export.h> |
1da177e4c Linux-2.6.12-rc2 |
7 8 |
#include <linux/fs.h> #include <linux/mm.h> |
1da177e4c Linux-2.6.12-rc2 |
9 |
#include <linux/backing-dev.h> |
1da177e4c Linux-2.6.12-rc2 |
10 11 12 |
#include <linux/hash.h> #include <linux/swap.h> #include <linux/security.h> |
1da177e4c Linux-2.6.12-rc2 |
13 |
#include <linux/cdev.h> |
57c8a661d mm: remove includ... |
14 |
#include <linux/memblock.h> |
3be25f49b fsnotify: add mar... |
15 |
#include <linux/fsnotify.h> |
fc33a7bb9 [PATCH] per-mount... |
16 |
#include <linux/mount.h> |
f19d4a8fa add caching of AC... |
17 |
#include <linux/posix_acl.h> |
9ce6e0be0 fs: add missing p... |
18 |
#include <linux/prefetch.h> |
4b4563dc8 fs: cosmetic inod... |
19 |
#include <linux/buffer_head.h> /* for inode_has_buffers */ |
7ada4db88 vfs: count unlink... |
20 |
#include <linux/ratelimit.h> |
bc3b14cb2 inode: convert in... |
21 |
#include <linux/list_lru.h> |
ae5e165d8 fs: new API for h... |
22 |
#include <linux/iversion.h> |
0ae45f63d vfs: add support ... |
23 |
#include <trace/events/writeback.h> |
a66979aba fs: move i_wb_lis... |
24 |
#include "internal.h" |
1da177e4c Linux-2.6.12-rc2 |
25 26 |
/* |
4b4563dc8 fs: cosmetic inod... |
27 |
* Inode locking rules: |
250df6ed2 fs: protect inode... |
28 29 30 |
* * inode->i_lock protects: * inode->i_state, inode->i_hash, __iget() |
bc3b14cb2 inode: convert in... |
31 |
* Inode LRU list locks protect: |
98b745c64 inode: Make unuse... |
32 |
* inode->i_sb->s_inode_lru, inode->i_lru |
74278da9f inode: convert in... |
33 34 |
* inode->i_sb->s_inode_list_lock protects: * inode->i_sb->s_inodes, inode->i_sb_list |
f758eeabe writeback: split ... |
35 |
* bdi->wb.list_lock protects: |
c7f540849 inode: rename i_w... |
36 |
* bdi->wb.b_{dirty,io,more_io,dirty_time}, inode->i_io_list |
67a23c494 fs: rename inode_... |
37 38 |
* inode_hash_lock protects: * inode_hashtable, inode->i_hash |
250df6ed2 fs: protect inode... |
39 40 |
* * Lock ordering: |
55fa6091d fs: move i_sb_lis... |
41 |
* |
74278da9f inode: convert in... |
42 |
* inode->i_sb->s_inode_list_lock |
55fa6091d fs: move i_sb_lis... |
43 |
* inode->i_lock |
bc3b14cb2 inode: convert in... |
44 |
* Inode LRU list locks |
a66979aba fs: move i_wb_lis... |
45 |
* |
f758eeabe writeback: split ... |
46 |
* bdi->wb.list_lock |
a66979aba fs: move i_wb_lis... |
47 |
* inode->i_lock |
67a23c494 fs: rename inode_... |
48 49 |
* * inode_hash_lock |
74278da9f inode: convert in... |
50 |
* inode->i_sb->s_inode_list_lock |
67a23c494 fs: rename inode_... |
51 52 53 54 |
* inode->i_lock * * iunique_lock * inode_hash_lock |
250df6ed2 fs: protect inode... |
55 |
*/ |
fa3536cc1 [PATCH] Use __rea... |
56 57 |
static unsigned int i_hash_mask __read_mostly; static unsigned int i_hash_shift __read_mostly; |
67a23c494 fs: rename inode_... |
58 59 |
static struct hlist_head *inode_hashtable __read_mostly; static __cacheline_aligned_in_smp DEFINE_SPINLOCK(inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
60 |
|
1da177e4c Linux-2.6.12-rc2 |
61 |
/* |
7dcda1c96 fs: export empty_... |
62 63 64 65 66 67 68 69 |
* Empty aops. Can be used for the cases where the user does not * define any of the address_space operations. */ const struct address_space_operations empty_aops = { }; EXPORT_SYMBOL(empty_aops); /* |
1da177e4c Linux-2.6.12-rc2 |
70 71 72 |
* Statistics gathering.. */ struct inodes_stat_t inodes_stat; |
3942c07cc fs: bump inode an... |
73 74 |
static DEFINE_PER_CPU(unsigned long, nr_inodes); static DEFINE_PER_CPU(unsigned long, nr_unused); |
cffbc8aa3 fs: Convert nr_in... |
75 |
|
6b3304b53 Make checkpatch.p... |
76 |
static struct kmem_cache *inode_cachep __read_mostly; |
1da177e4c Linux-2.6.12-rc2 |
77 |
|
3942c07cc fs: bump inode an... |
78 |
static long get_nr_inodes(void) |
cffbc8aa3 fs: Convert nr_in... |
79 |
{ |
3e880fb5e fs: use fast coun... |
80 |
int i; |
3942c07cc fs: bump inode an... |
81 |
long sum = 0; |
3e880fb5e fs: use fast coun... |
82 83 84 |
for_each_possible_cpu(i) sum += per_cpu(nr_inodes, i); return sum < 0 ? 0 : sum; |
cffbc8aa3 fs: Convert nr_in... |
85 |
} |
3942c07cc fs: bump inode an... |
86 |
static inline long get_nr_inodes_unused(void) |
cffbc8aa3 fs: Convert nr_in... |
87 |
{ |
fcb94f72d inode: convert in... |
88 |
int i; |
3942c07cc fs: bump inode an... |
89 |
long sum = 0; |
fcb94f72d inode: convert in... |
90 91 92 |
for_each_possible_cpu(i) sum += per_cpu(nr_unused, i); return sum < 0 ? 0 : sum; |
cffbc8aa3 fs: Convert nr_in... |
93 |
} |
3942c07cc fs: bump inode an... |
94 |
long get_nr_dirty_inodes(void) |
cffbc8aa3 fs: Convert nr_in... |
95 |
{ |
3e880fb5e fs: use fast coun... |
96 |
/* not actually dirty inodes, but a wild approximation */ |
3942c07cc fs: bump inode an... |
97 |
long nr_dirty = get_nr_inodes() - get_nr_inodes_unused(); |
cffbc8aa3 fs: Convert nr_in... |
98 |
return nr_dirty > 0 ? nr_dirty : 0; |
cffbc8aa3 fs: Convert nr_in... |
99 100 101 102 103 104 |
} /* * Handle nr_inode sysctl */ #ifdef CONFIG_SYSCTL |
1f7e0616c fs: convert use o... |
105 |
int proc_nr_inodes(struct ctl_table *table, int write, |
cffbc8aa3 fs: Convert nr_in... |
106 107 108 |
void __user *buffer, size_t *lenp, loff_t *ppos) { inodes_stat.nr_inodes = get_nr_inodes(); |
fcb94f72d inode: convert in... |
109 |
inodes_stat.nr_unused = get_nr_inodes_unused(); |
3942c07cc fs: bump inode an... |
110 |
return proc_doulongvec_minmax(table, write, buffer, lenp, ppos); |
cffbc8aa3 fs: Convert nr_in... |
111 112 |
} #endif |
bd9b51e79 make default ->i_... |
113 114 115 116 |
static int no_open(struct inode *inode, struct file *file) { return -ENXIO; } |
2cb1599f9 Inode: Allow exte... |
117 |
/** |
6e7c2b4dd scripts/spelling.... |
118 |
* inode_init_always - perform inode structure initialisation |
0bc02f3fa fs/inode: fix ker... |
119 120 |
* @sb: superblock inode belongs to * @inode: inode to initialise |
2cb1599f9 Inode: Allow exte... |
121 122 123 124 |
* * These are initializations that need to be done on every inode * allocation as the fields are not initialised by slab allocation. */ |
54e346215 vfs: fix inode_in... |
125 |
int inode_init_always(struct super_block *sb, struct inode *inode) |
1da177e4c Linux-2.6.12-rc2 |
126 |
{ |
6e1d5dcc2 const: mark remai... |
127 |
static const struct inode_operations empty_iops; |
bd9b51e79 make default ->i_... |
128 |
static const struct file_operations no_open_fops = {.open = no_open}; |
6b3304b53 Make checkpatch.p... |
129 |
struct address_space *const mapping = &inode->i_data; |
2cb1599f9 Inode: Allow exte... |
130 131 132 133 |
inode->i_sb = sb; inode->i_blkbits = sb->s_blocksize_bits; inode->i_flags = 0; |
553d46b07 futex: Fix inode ... |
134 |
atomic64_set(&inode->i_sequence, 0); |
2cb1599f9 Inode: Allow exte... |
135 136 |
atomic_set(&inode->i_count, 1); inode->i_op = &empty_iops; |
bd9b51e79 make default ->i_... |
137 |
inode->i_fop = &no_open_fops; |
a78ef704a vfs: protect i_nlink |
138 |
inode->__i_nlink = 1; |
3ddcd0569 vfs: optimize ino... |
139 |
inode->i_opflags = 0; |
d0a5b995a vfs: Add IOP_XATT... |
140 141 |
if (sb->s_xattr) inode->i_opflags |= IOP_XATTR; |
92361636e userns: Store uid... |
142 143 |
i_uid_write(inode, 0); i_gid_write(inode, 0); |
2cb1599f9 Inode: Allow exte... |
144 145 |
atomic_set(&inode->i_writecount, 0); inode->i_size = 0; |
c75b1d942 fs: add fcntl() i... |
146 |
inode->i_write_hint = WRITE_LIFE_NOT_SET; |
2cb1599f9 Inode: Allow exte... |
147 148 149 |
inode->i_blocks = 0; inode->i_bytes = 0; inode->i_generation = 0; |
2cb1599f9 Inode: Allow exte... |
150 151 152 |
inode->i_pipe = NULL; inode->i_bdev = NULL; inode->i_cdev = NULL; |
61ba64fc0 libfs: simple_fol... |
153 |
inode->i_link = NULL; |
84e710da2 parallel lookups ... |
154 |
inode->i_dir_seq = 0; |
2cb1599f9 Inode: Allow exte... |
155 156 |
inode->i_rdev = 0; inode->dirtied_when = 0; |
6146f0d5e integrity: IMA hooks |
157 |
|
3d65ae463 writeback: initia... |
158 159 160 161 162 |
#ifdef CONFIG_CGROUP_WRITEBACK inode->i_wb_frn_winner = 0; inode->i_wb_frn_avg_time = 0; inode->i_wb_frn_history = 0; #endif |
6146f0d5e integrity: IMA hooks |
163 |
if (security_inode_alloc(inode)) |
54e346215 vfs: fix inode_in... |
164 |
goto out; |
2cb1599f9 Inode: Allow exte... |
165 166 |
spin_lock_init(&inode->i_lock); lockdep_set_class(&inode->i_lock, &sb->s_type->i_lock_key); |
9902af79c parallel lookups:... |
167 168 |
init_rwsem(&inode->i_rwsem); lockdep_set_class(&inode->i_rwsem, &sb->s_type->i_mutex_key); |
2cb1599f9 Inode: Allow exte... |
169 |
|
bd5fe6c5e fs: kill i_alloc_sem |
170 |
atomic_set(&inode->i_dio_count, 0); |
2cb1599f9 Inode: Allow exte... |
171 172 173 174 |
mapping->a_ops = &empty_aops; mapping->host = inode; mapping->flags = 0; |
829bc787c fs: clear writeba... |
175 |
mapping->wb_err = 0; |
4bb5f5d93 mm: allow drivers... |
176 |
atomic_set(&mapping->i_mmap_writable, 0); |
09d91cda0 mm,thp: avoid wri... |
177 178 179 |
#ifdef CONFIG_READ_ONLY_THP_FOR_FS atomic_set(&mapping->nr_thps, 0); #endif |
3c1d43787 mm: remove GFP_HI... |
180 |
mapping_set_gfp_mask(mapping, GFP_HIGHUSER_MOVABLE); |
252aa6f5b mm: redefine addr... |
181 |
mapping->private_data = NULL; |
2cb1599f9 Inode: Allow exte... |
182 |
mapping->writeback_index = 0; |
2cb1599f9 Inode: Allow exte... |
183 184 |
inode->i_private = NULL; inode->i_mapping = mapping; |
b3d9b7a3c vfs: switch i_den... |
185 |
INIT_HLIST_HEAD(&inode->i_dentry); /* buggered by rcu freeing */ |
f19d4a8fa add caching of AC... |
186 187 188 |
#ifdef CONFIG_FS_POSIX_ACL inode->i_acl = inode->i_default_acl = ACL_NOT_CACHED; #endif |
2cb1599f9 Inode: Allow exte... |
189 |
|
3be25f49b fsnotify: add mar... |
190 191 192 |
#ifdef CONFIG_FSNOTIFY inode->i_fsnotify_mask = 0; #endif |
4a075e39c locks: add a new ... |
193 |
inode->i_flctx = NULL; |
3e880fb5e fs: use fast coun... |
194 |
this_cpu_inc(nr_inodes); |
cffbc8aa3 fs: Convert nr_in... |
195 |
|
54e346215 vfs: fix inode_in... |
196 |
return 0; |
54e346215 vfs: fix inode_in... |
197 198 |
out: return -ENOMEM; |
1da177e4c Linux-2.6.12-rc2 |
199 |
} |
2cb1599f9 Inode: Allow exte... |
200 |
EXPORT_SYMBOL(inode_init_always); |
fdb0da89f new inode method:... |
201 202 203 204 205 206 207 208 209 210 211 212 213 214 |
void free_inode_nonrcu(struct inode *inode) { kmem_cache_free(inode_cachep, inode); } EXPORT_SYMBOL(free_inode_nonrcu); static void i_callback(struct rcu_head *head) { struct inode *inode = container_of(head, struct inode, i_rcu); if (inode->free_inode) inode->free_inode(inode); else free_inode_nonrcu(inode); } |
2cb1599f9 Inode: Allow exte... |
215 216 |
static struct inode *alloc_inode(struct super_block *sb) { |
fdb0da89f new inode method:... |
217 |
const struct super_operations *ops = sb->s_op; |
2cb1599f9 Inode: Allow exte... |
218 |
struct inode *inode; |
fdb0da89f new inode method:... |
219 220 |
if (ops->alloc_inode) inode = ops->alloc_inode(sb); |
2cb1599f9 Inode: Allow exte... |
221 222 |
else inode = kmem_cache_alloc(inode_cachep, GFP_KERNEL); |
54e346215 vfs: fix inode_in... |
223 224 225 226 |
if (!inode) return NULL; if (unlikely(inode_init_always(sb, inode))) { |
fdb0da89f new inode method:... |
227 228 229 230 231 232 233 |
if (ops->destroy_inode) { ops->destroy_inode(inode); if (!ops->free_inode) return NULL; } inode->free_inode = ops->free_inode; i_callback(&inode->i_rcu); |
54e346215 vfs: fix inode_in... |
234 235 236 237 |
return NULL; } return inode; |
2cb1599f9 Inode: Allow exte... |
238 |
} |
1da177e4c Linux-2.6.12-rc2 |
239 |
|
2e00c97e2 vfs: add __destro... |
240 |
void __destroy_inode(struct inode *inode) |
1da177e4c Linux-2.6.12-rc2 |
241 |
{ |
b7542f8c7 BUG_ON() Conversi... |
242 |
BUG_ON(inode_has_buffers(inode)); |
52ebea749 writeback: make b... |
243 |
inode_detach_wb(inode); |
1da177e4c Linux-2.6.12-rc2 |
244 |
security_inode_free(inode); |
3be25f49b fsnotify: add mar... |
245 |
fsnotify_inode_delete(inode); |
f27a0fe08 locks: pass inode... |
246 |
locks_free_lock_context(inode); |
7ada4db88 vfs: count unlink... |
247 248 249 250 |
if (!inode->i_nlink) { WARN_ON(atomic_long_read(&inode->i_sb->s_remove_count) == 0); atomic_long_dec(&inode->i_sb->s_remove_count); } |
f19d4a8fa add caching of AC... |
251 |
#ifdef CONFIG_FS_POSIX_ACL |
b8a7a3a66 posix_acl: Inode ... |
252 |
if (inode->i_acl && !is_uncached_acl(inode->i_acl)) |
f19d4a8fa add caching of AC... |
253 |
posix_acl_release(inode->i_acl); |
b8a7a3a66 posix_acl: Inode ... |
254 |
if (inode->i_default_acl && !is_uncached_acl(inode->i_default_acl)) |
f19d4a8fa add caching of AC... |
255 256 |
posix_acl_release(inode->i_default_acl); #endif |
3e880fb5e fs: use fast coun... |
257 |
this_cpu_dec(nr_inodes); |
2e00c97e2 vfs: add __destro... |
258 259 |
} EXPORT_SYMBOL(__destroy_inode); |
56b0dacfa fs: mark destroy_... |
260 |
static void destroy_inode(struct inode *inode) |
2e00c97e2 vfs: add __destro... |
261 |
{ |
fdb0da89f new inode method:... |
262 |
const struct super_operations *ops = inode->i_sb->s_op; |
7ccf19a80 fs: inode split I... |
263 |
BUG_ON(!list_empty(&inode->i_lru)); |
2e00c97e2 vfs: add __destro... |
264 |
__destroy_inode(inode); |
fdb0da89f new inode method:... |
265 266 267 268 269 270 271 |
if (ops->destroy_inode) { ops->destroy_inode(inode); if (!ops->free_inode) return; } inode->free_inode = ops->free_inode; call_rcu(&inode->i_rcu, i_callback); |
1da177e4c Linux-2.6.12-rc2 |
272 |
} |
1da177e4c Linux-2.6.12-rc2 |
273 |
|
7ada4db88 vfs: count unlink... |
274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 |
/** * drop_nlink - directly drop an inode's link count * @inode: inode * * This is a low-level filesystem helper to replace any * direct filesystem manipulation of i_nlink. In cases * where we are attempting to track writes to the * filesystem, a decrement to zero means an imminent * write when the file is truncated and actually unlinked * on the filesystem. */ void drop_nlink(struct inode *inode) { WARN_ON(inode->i_nlink == 0); inode->__i_nlink--; if (!inode->i_nlink) atomic_long_inc(&inode->i_sb->s_remove_count); } EXPORT_SYMBOL(drop_nlink); /** * clear_nlink - directly zero an inode's link count * @inode: inode * * This is a low-level filesystem helper to replace any * direct filesystem manipulation of i_nlink. See * drop_nlink() for why we care about i_nlink hitting zero. */ void clear_nlink(struct inode *inode) { if (inode->i_nlink) { inode->__i_nlink = 0; atomic_long_inc(&inode->i_sb->s_remove_count); } } EXPORT_SYMBOL(clear_nlink); /** * set_nlink - directly set an inode's link count * @inode: inode * @nlink: new nlink (should be non-zero) * * This is a low-level filesystem helper to replace any * direct filesystem manipulation of i_nlink. */ void set_nlink(struct inode *inode, unsigned int nlink) { if (!nlink) { |
7ada4db88 vfs: count unlink... |
322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 |
clear_nlink(inode); } else { /* Yes, some filesystems do change nlink from zero to one */ if (inode->i_nlink == 0) atomic_long_dec(&inode->i_sb->s_remove_count); inode->__i_nlink = nlink; } } EXPORT_SYMBOL(set_nlink); /** * inc_nlink - directly increment an inode's link count * @inode: inode * * This is a low-level filesystem helper to replace any * direct filesystem manipulation of i_nlink. Currently, * it is only here for parity with dec_nlink(). */ void inc_nlink(struct inode *inode) { |
f4e0c30c1 allow the temp fi... |
343 344 |
if (unlikely(inode->i_nlink == 0)) { WARN_ON(!(inode->i_state & I_LINKABLE)); |
7ada4db88 vfs: count unlink... |
345 |
atomic_long_dec(&inode->i_sb->s_remove_count); |
f4e0c30c1 allow the temp fi... |
346 |
} |
7ada4db88 vfs: count unlink... |
347 348 349 350 |
inode->__i_nlink++; } EXPORT_SYMBOL(inc_nlink); |
ae23395d8 inode: don't mems... |
351 |
static void __address_space_init_once(struct address_space *mapping) |
2aa15890f mm: prevent concu... |
352 |
{ |
7b785645e mm: fix page cach... |
353 |
xa_init_flags(&mapping->i_pages, XA_FLAGS_LOCK_IRQ | XA_FLAGS_ACCOUNT); |
c8c06efa8 mm: convert i_mma... |
354 |
init_rwsem(&mapping->i_mmap_rwsem); |
2aa15890f mm: prevent concu... |
355 356 |
INIT_LIST_HEAD(&mapping->private_list); spin_lock_init(&mapping->private_lock); |
f808c13fd lib/interval_tree... |
357 |
mapping->i_mmap = RB_ROOT_CACHED; |
2aa15890f mm: prevent concu... |
358 |
} |
ae23395d8 inode: don't mems... |
359 360 361 362 363 364 |
void address_space_init_once(struct address_space *mapping) { memset(mapping, 0, sizeof(*mapping)); __address_space_init_once(mapping); } |
2aa15890f mm: prevent concu... |
365 |
EXPORT_SYMBOL(address_space_init_once); |
1da177e4c Linux-2.6.12-rc2 |
366 367 368 369 370 371 372 373 374 |
/* * These are initializations that only need to be done * once, because the fields are idempotent across use * of the inode, so let the slab aware of that. */ void inode_init_once(struct inode *inode) { memset(inode, 0, sizeof(*inode)); INIT_HLIST_NODE(&inode->i_hash); |
1da177e4c Linux-2.6.12-rc2 |
375 |
INIT_LIST_HEAD(&inode->i_devices); |
c7f540849 inode: rename i_w... |
376 |
INIT_LIST_HEAD(&inode->i_io_list); |
6c60d2b57 fs/fs-writeback.c... |
377 |
INIT_LIST_HEAD(&inode->i_wb_list); |
7ccf19a80 fs: inode split I... |
378 |
INIT_LIST_HEAD(&inode->i_lru); |
ae23395d8 inode: don't mems... |
379 |
__address_space_init_once(&inode->i_data); |
1da177e4c Linux-2.6.12-rc2 |
380 381 |
i_size_ordered_init(inode); } |
1da177e4c Linux-2.6.12-rc2 |
382 |
EXPORT_SYMBOL(inode_init_once); |
51cc50685 SL*B: drop kmem c... |
383 |
static void init_once(void *foo) |
1da177e4c Linux-2.6.12-rc2 |
384 |
{ |
6b3304b53 Make checkpatch.p... |
385 |
struct inode *inode = (struct inode *) foo; |
1da177e4c Linux-2.6.12-rc2 |
386 |
|
a35afb830 Remove SLAB_CTOR_... |
387 |
inode_init_once(inode); |
1da177e4c Linux-2.6.12-rc2 |
388 389 390 |
} /* |
250df6ed2 fs: protect inode... |
391 |
* inode->i_lock must be held |
1da177e4c Linux-2.6.12-rc2 |
392 |
*/ |
6b3304b53 Make checkpatch.p... |
393 |
void __iget(struct inode *inode) |
1da177e4c Linux-2.6.12-rc2 |
394 |
{ |
9e38d86ff fs: Implement laz... |
395 396 |
atomic_inc(&inode->i_count); } |
2e147f1ef fs: inode.c use a... |
397 |
|
7de9c6ee3 new helper: ihold() |
398 399 400 401 402 403 404 405 |
/* * get additional reference to inode; caller must already hold one. */ void ihold(struct inode *inode) { WARN_ON(atomic_inc_return(&inode->i_count) < 2); } EXPORT_SYMBOL(ihold); |
9e38d86ff fs: Implement laz... |
406 407 |
static void inode_lru_list_add(struct inode *inode) { |
bc3b14cb2 inode: convert in... |
408 |
if (list_lru_add(&inode->i_sb->s_inode_lru, &inode->i_lru)) |
fcb94f72d inode: convert in... |
409 |
this_cpu_inc(nr_unused); |
563f40019 fs: don't set *RE... |
410 411 |
else inode->i_state |= I_REFERENCED; |
9e38d86ff fs: Implement laz... |
412 |
} |
2e147f1ef fs: inode.c use a... |
413 |
|
4eff96dd5 writeback: put un... |
414 415 416 417 418 419 420 |
/* * Add inode to LRU if needed (inode is unused and clean). * * Needs inode->i_lock held. */ void inode_add_lru(struct inode *inode) { |
0ae45f63d vfs: add support ... |
421 422 |
if (!(inode->i_state & (I_DIRTY_ALL | I_SYNC | I_FREEING | I_WILL_FREE)) && |
1751e8a6c Rename superblock... |
423 |
!atomic_read(&inode->i_count) && inode->i_sb->s_flags & SB_ACTIVE) |
4eff96dd5 writeback: put un... |
424 425 |
inode_lru_list_add(inode); } |
9e38d86ff fs: Implement laz... |
426 427 |
static void inode_lru_list_del(struct inode *inode) { |
bc3b14cb2 inode: convert in... |
428 429 |
if (list_lru_del(&inode->i_sb->s_inode_lru, &inode->i_lru)) |
fcb94f72d inode: convert in... |
430 |
this_cpu_dec(nr_unused); |
1da177e4c Linux-2.6.12-rc2 |
431 |
} |
646ec4615 fs: remove inode_... |
432 433 434 435 436 437 |
/** * inode_sb_list_add - add inode to the superblock list of inodes * @inode: inode to add */ void inode_sb_list_add(struct inode *inode) { |
74278da9f inode: convert in... |
438 |
spin_lock(&inode->i_sb->s_inode_list_lock); |
55fa6091d fs: move i_sb_lis... |
439 |
list_add(&inode->i_sb_list, &inode->i_sb->s_inodes); |
74278da9f inode: convert in... |
440 |
spin_unlock(&inode->i_sb->s_inode_list_lock); |
646ec4615 fs: remove inode_... |
441 442 |
} EXPORT_SYMBOL_GPL(inode_sb_list_add); |
55fa6091d fs: move i_sb_lis... |
443 |
static inline void inode_sb_list_del(struct inode *inode) |
646ec4615 fs: remove inode_... |
444 |
{ |
a209dfc7b vfs: dont chain p... |
445 |
if (!list_empty(&inode->i_sb_list)) { |
74278da9f inode: convert in... |
446 |
spin_lock(&inode->i_sb->s_inode_list_lock); |
a209dfc7b vfs: dont chain p... |
447 |
list_del_init(&inode->i_sb_list); |
74278da9f inode: convert in... |
448 |
spin_unlock(&inode->i_sb->s_inode_list_lock); |
a209dfc7b vfs: dont chain p... |
449 |
} |
646ec4615 fs: remove inode_... |
450 |
} |
4c51acbc6 fs: Factor inode ... |
451 452 453 454 455 456 |
static unsigned long hash(struct super_block *sb, unsigned long hashval) { unsigned long tmp; tmp = (hashval * (unsigned long)sb) ^ (GOLDEN_RATIO_PRIME + hashval) / L1_CACHE_BYTES; |
4b4563dc8 fs: cosmetic inod... |
457 458 |
tmp = tmp ^ ((tmp ^ GOLDEN_RATIO_PRIME) >> i_hash_shift); return tmp & i_hash_mask; |
4c51acbc6 fs: Factor inode ... |
459 460 461 462 463 464 465 466 467 468 469 470 |
} /** * __insert_inode_hash - hash an inode * @inode: unhashed inode * @hashval: unsigned long value used to locate this object in the * inode_hashtable. * * Add an inode to the inode hash for this superblock. */ void __insert_inode_hash(struct inode *inode, unsigned long hashval) { |
646ec4615 fs: remove inode_... |
471 |
struct hlist_head *b = inode_hashtable + hash(inode->i_sb, hashval); |
67a23c494 fs: rename inode_... |
472 |
spin_lock(&inode_hash_lock); |
250df6ed2 fs: protect inode... |
473 |
spin_lock(&inode->i_lock); |
646ec4615 fs: remove inode_... |
474 |
hlist_add_head(&inode->i_hash, b); |
250df6ed2 fs: protect inode... |
475 |
spin_unlock(&inode->i_lock); |
67a23c494 fs: rename inode_... |
476 |
spin_unlock(&inode_hash_lock); |
4c51acbc6 fs: Factor inode ... |
477 478 479 480 |
} EXPORT_SYMBOL(__insert_inode_hash); /** |
f2ee7abf4 vfs: avoid taking... |
481 |
* __remove_inode_hash - remove an inode from the hash |
4c51acbc6 fs: Factor inode ... |
482 483 484 485 |
* @inode: inode to unhash * * Remove an inode from the superblock. */ |
f2ee7abf4 vfs: avoid taking... |
486 |
void __remove_inode_hash(struct inode *inode) |
4c51acbc6 fs: Factor inode ... |
487 |
{ |
67a23c494 fs: rename inode_... |
488 |
spin_lock(&inode_hash_lock); |
250df6ed2 fs: protect inode... |
489 |
spin_lock(&inode->i_lock); |
4c51acbc6 fs: Factor inode ... |
490 |
hlist_del_init(&inode->i_hash); |
250df6ed2 fs: protect inode... |
491 |
spin_unlock(&inode->i_lock); |
67a23c494 fs: rename inode_... |
492 |
spin_unlock(&inode_hash_lock); |
4c51acbc6 fs: Factor inode ... |
493 |
} |
f2ee7abf4 vfs: avoid taking... |
494 |
EXPORT_SYMBOL(__remove_inode_hash); |
4c51acbc6 fs: Factor inode ... |
495 |
|
dbd5768f8 vfs: Rename end_w... |
496 |
void clear_inode(struct inode *inode) |
b0683aa63 new helper: end_w... |
497 |
{ |
08142579b mm: fix assertion... |
498 |
/* |
b93b01631 page cache: use x... |
499 |
* We have to cycle the i_pages lock here because reclaim can be in the |
08142579b mm: fix assertion... |
500 |
* process of removing the last page (in __delete_from_page_cache()) |
b93b01631 page cache: use x... |
501 |
* and we must not free the mapping under it. |
08142579b mm: fix assertion... |
502 |
*/ |
b93b01631 page cache: use x... |
503 |
xa_lock_irq(&inode->i_data.i_pages); |
b0683aa63 new helper: end_w... |
504 |
BUG_ON(inode->i_data.nrpages); |
f9fe48bec dax: support dirt... |
505 |
BUG_ON(inode->i_data.nrexceptional); |
b93b01631 page cache: use x... |
506 |
xa_unlock_irq(&inode->i_data.i_pages); |
b0683aa63 new helper: end_w... |
507 508 509 |
BUG_ON(!list_empty(&inode->i_data.private_list)); BUG_ON(!(inode->i_state & I_FREEING)); BUG_ON(inode->i_state & I_CLEAR); |
6c60d2b57 fs/fs-writeback.c... |
510 |
BUG_ON(!list_empty(&inode->i_wb_list)); |
fa0d7e3de fs: icache RCU fr... |
511 |
/* don't need i_lock here, no concurrent mods to i_state */ |
b0683aa63 new helper: end_w... |
512 513 |
inode->i_state = I_FREEING | I_CLEAR; } |
dbd5768f8 vfs: Rename end_w... |
514 |
EXPORT_SYMBOL(clear_inode); |
b0683aa63 new helper: end_w... |
515 |
|
b2b2af8e6 fs: factor inode ... |
516 517 518 519 520 521 522 523 524 525 526 527 528 |
/* * Free the inode passed in, removing it from the lists it is still connected * to. We remove any pages still attached to the inode and wait for any IO that * is still in progress before finally destroying the inode. * * An inode must already be marked I_FREEING so that we avoid the inode being * moved back onto lists if we race with other code that manipulates the lists * (e.g. writeback_single_inode). The caller is responsible for setting this. * * An inode must already be removed from the LRU list before being evicted from * the cache. This should occur atomically with setting the I_FREEING state * flag, so no inodes here should ever be on the LRU when being evicted. */ |
644da5960 fs/inode.c:evict(... |
529 |
static void evict(struct inode *inode) |
b4272d4c8 unify fs/inode.c ... |
530 531 |
{ const struct super_operations *op = inode->i_sb->s_op; |
b2b2af8e6 fs: factor inode ... |
532 533 |
BUG_ON(!(inode->i_state & I_FREEING)); BUG_ON(!list_empty(&inode->i_lru)); |
c7f540849 inode: rename i_w... |
534 535 |
if (!list_empty(&inode->i_io_list)) inode_io_list_del(inode); |
b12362bdb vfs: conditionall... |
536 |
|
55fa6091d fs: move i_sb_lis... |
537 |
inode_sb_list_del(inode); |
169ebd901 writeback: Avoid ... |
538 539 540 541 542 543 544 |
/* * Wait for flusher thread to be done with the inode so that filesystem * does not start destroying it while writeback is still running. Since * the inode has I_FREEING set, flusher thread won't start new work on * the inode. We just have to wait for running writeback to finish. */ inode_wait_for_writeback(inode); |
7994e6f72 vfs: Move waiting... |
545 |
|
be7ce4161 New method - evic... |
546 547 |
if (op->evict_inode) { op->evict_inode(inode); |
b4272d4c8 unify fs/inode.c ... |
548 |
} else { |
91b0abe36 mm + fs: store sh... |
549 |
truncate_inode_pages_final(&inode->i_data); |
dbd5768f8 vfs: Rename end_w... |
550 |
clear_inode(inode); |
b4272d4c8 unify fs/inode.c ... |
551 |
} |
661074e91 Take ->i_bdev/->i... |
552 553 554 555 |
if (S_ISBLK(inode->i_mode) && inode->i_bdev) bd_forget(inode); if (S_ISCHR(inode->i_mode) && inode->i_cdev) cd_forget(inode); |
b2b2af8e6 fs: factor inode ... |
556 557 558 559 560 561 562 563 564 |
remove_inode_hash(inode); spin_lock(&inode->i_lock); wake_up_bit(&inode->i_state, __I_NEW); BUG_ON(inode->i_state != (I_FREEING | I_CLEAR)); spin_unlock(&inode->i_lock); destroy_inode(inode); |
b4272d4c8 unify fs/inode.c ... |
565 |
} |
1da177e4c Linux-2.6.12-rc2 |
566 567 568 569 570 571 572 573 574 |
/* * dispose_list - dispose of the contents of a local list * @head: the head of the list to free * * Dispose-list gets a local list with local inodes in it, so it doesn't * need to worry about list corruption and SMP locks. */ static void dispose_list(struct list_head *head) { |
1da177e4c Linux-2.6.12-rc2 |
575 576 |
while (!list_empty(head)) { struct inode *inode; |
7ccf19a80 fs: inode split I... |
577 578 |
inode = list_first_entry(head, struct inode, i_lru); list_del_init(&inode->i_lru); |
1da177e4c Linux-2.6.12-rc2 |
579 |
|
644da5960 fs/inode.c:evict(... |
580 |
evict(inode); |
ac05fbb40 inode: don't soft... |
581 |
cond_resched(); |
1da177e4c Linux-2.6.12-rc2 |
582 |
} |
1da177e4c Linux-2.6.12-rc2 |
583 |
} |
a03187867 fs: fold invalida... |
584 |
/** |
63997e98a split invalidate_... |
585 586 587 588 |
* evict_inodes - evict all evictable inodes for a superblock * @sb: superblock to operate on * * Make sure that no inodes with zero refcount are retained. This is |
1751e8a6c Rename superblock... |
589 |
* called by superblock shutdown after having SB_ACTIVE flag removed, |
63997e98a split invalidate_... |
590 591 |
* so any inode reaching zero refcount during or after that call will * be immediately evicted. |
1da177e4c Linux-2.6.12-rc2 |
592 |
*/ |
63997e98a split invalidate_... |
593 |
void evict_inodes(struct super_block *sb) |
1da177e4c Linux-2.6.12-rc2 |
594 |
{ |
63997e98a split invalidate_... |
595 596 |
struct inode *inode, *next; LIST_HEAD(dispose); |
1da177e4c Linux-2.6.12-rc2 |
597 |
|
ac05fbb40 inode: don't soft... |
598 |
again: |
74278da9f inode: convert in... |
599 |
spin_lock(&sb->s_inode_list_lock); |
63997e98a split invalidate_... |
600 601 |
list_for_each_entry_safe(inode, next, &sb->s_inodes, i_sb_list) { if (atomic_read(&inode->i_count)) |
aabb8fdb4 fs: avoid I_NEW i... |
602 |
continue; |
250df6ed2 fs: protect inode... |
603 604 605 606 |
spin_lock(&inode->i_lock); if (inode->i_state & (I_NEW | I_FREEING | I_WILL_FREE)) { spin_unlock(&inode->i_lock); |
1da177e4c Linux-2.6.12-rc2 |
607 |
continue; |
250df6ed2 fs: protect inode... |
608 |
} |
63997e98a split invalidate_... |
609 610 |
inode->i_state |= I_FREEING; |
02afc410f fs: Lock the inod... |
611 |
inode_lru_list_del(inode); |
250df6ed2 fs: protect inode... |
612 |
spin_unlock(&inode->i_lock); |
02afc410f fs: Lock the inod... |
613 |
list_add(&inode->i_lru, &dispose); |
ac05fbb40 inode: don't soft... |
614 615 616 617 618 619 620 621 622 623 624 625 |
/* * We can have a ton of inodes to evict at unmount time given * enough memory, check to see if we need to go to sleep for a * bit so we don't livelock. */ if (need_resched()) { spin_unlock(&sb->s_inode_list_lock); cond_resched(); dispose_list(&dispose); goto again; } |
1da177e4c Linux-2.6.12-rc2 |
626 |
} |
74278da9f inode: convert in... |
627 |
spin_unlock(&sb->s_inode_list_lock); |
63997e98a split invalidate_... |
628 629 |
dispose_list(&dispose); |
1da177e4c Linux-2.6.12-rc2 |
630 |
} |
799ea9e9c xfs: evict all in... |
631 |
EXPORT_SYMBOL_GPL(evict_inodes); |
1da177e4c Linux-2.6.12-rc2 |
632 |
|
1da177e4c Linux-2.6.12-rc2 |
633 |
/** |
a03187867 fs: fold invalida... |
634 635 |
* invalidate_inodes - attempt to free all inodes on a superblock * @sb: superblock to operate on |
93b270f76 Fix over-zealous ... |
636 |
* @kill_dirty: flag to guide handling of dirty inodes |
1da177e4c Linux-2.6.12-rc2 |
637 |
* |
a03187867 fs: fold invalida... |
638 639 |
* Attempts to free all inodes for a given superblock. If there were any * busy inodes return a non-zero value, else zero. |
93b270f76 Fix over-zealous ... |
640 641 |
* If @kill_dirty is set, discard dirty inodes too, otherwise treat * them as busy. |
1da177e4c Linux-2.6.12-rc2 |
642 |
*/ |
93b270f76 Fix over-zealous ... |
643 |
int invalidate_inodes(struct super_block *sb, bool kill_dirty) |
1da177e4c Linux-2.6.12-rc2 |
644 |
{ |
cffbc8aa3 fs: Convert nr_in... |
645 |
int busy = 0; |
a03187867 fs: fold invalida... |
646 647 |
struct inode *inode, *next; LIST_HEAD(dispose); |
1da177e4c Linux-2.6.12-rc2 |
648 |
|
16b730a45 fs: avoid softloc... |
649 |
again: |
74278da9f inode: convert in... |
650 |
spin_lock(&sb->s_inode_list_lock); |
a03187867 fs: fold invalida... |
651 |
list_for_each_entry_safe(inode, next, &sb->s_inodes, i_sb_list) { |
250df6ed2 fs: protect inode... |
652 653 654 |
spin_lock(&inode->i_lock); if (inode->i_state & (I_NEW | I_FREEING | I_WILL_FREE)) { spin_unlock(&inode->i_lock); |
aabb8fdb4 fs: avoid I_NEW i... |
655 |
continue; |
250df6ed2 fs: protect inode... |
656 |
} |
0ae45f63d vfs: add support ... |
657 |
if (inode->i_state & I_DIRTY_ALL && !kill_dirty) { |
250df6ed2 fs: protect inode... |
658 |
spin_unlock(&inode->i_lock); |
93b270f76 Fix over-zealous ... |
659 660 661 |
busy = 1; continue; } |
99a389192 fs: fix buffer in... |
662 |
if (atomic_read(&inode->i_count)) { |
250df6ed2 fs: protect inode... |
663 |
spin_unlock(&inode->i_lock); |
99a389192 fs: fix buffer in... |
664 |
busy = 1; |
1da177e4c Linux-2.6.12-rc2 |
665 666 |
continue; } |
99a389192 fs: fix buffer in... |
667 |
|
99a389192 fs: fix buffer in... |
668 |
inode->i_state |= I_FREEING; |
02afc410f fs: Lock the inod... |
669 |
inode_lru_list_del(inode); |
250df6ed2 fs: protect inode... |
670 |
spin_unlock(&inode->i_lock); |
02afc410f fs: Lock the inod... |
671 |
list_add(&inode->i_lru, &dispose); |
16b730a45 fs: avoid softloc... |
672 673 674 675 676 677 |
if (need_resched()) { spin_unlock(&sb->s_inode_list_lock); cond_resched(); dispose_list(&dispose); goto again; } |
1da177e4c Linux-2.6.12-rc2 |
678 |
} |
74278da9f inode: convert in... |
679 |
spin_unlock(&sb->s_inode_list_lock); |
1da177e4c Linux-2.6.12-rc2 |
680 |
|
a03187867 fs: fold invalida... |
681 |
dispose_list(&dispose); |
1da177e4c Linux-2.6.12-rc2 |
682 683 684 |
return busy; } |
1da177e4c Linux-2.6.12-rc2 |
685 |
|
1da177e4c Linux-2.6.12-rc2 |
686 |
/* |
bc3b14cb2 inode: convert in... |
687 |
* Isolate the inode from the LRU in preparation for freeing it. |
1da177e4c Linux-2.6.12-rc2 |
688 689 |
* * Any inodes which are pinned purely because of attached pagecache have their |
9e38d86ff fs: Implement laz... |
690 691 |
* pagecache removed. If the inode has metadata buffers attached to * mapping->private_list then try to remove them. |
1da177e4c Linux-2.6.12-rc2 |
692 |
* |
9e38d86ff fs: Implement laz... |
693 694 695 696 697 698 699 |
* If the inode has the I_REFERENCED flag set, then it means that it has been * used recently - the flag is set in iput_final(). When we encounter such an * inode, clear the flag and move it to the back of the LRU so it gets another * pass through the LRU before it gets reclaimed. This is necessary because of * the fact we are doing lazy LRU updates to minimise lock contention so the * LRU does not have strict ordering. Hence we don't want to reclaim inodes * with this flag set because they are the inodes that are out of order. |
1da177e4c Linux-2.6.12-rc2 |
700 |
*/ |
3f97b1632 list_lru: add hel... |
701 702 |
static enum lru_status inode_lru_isolate(struct list_head *item, struct list_lru_one *lru, spinlock_t *lru_lock, void *arg) |
1da177e4c Linux-2.6.12-rc2 |
703 |
{ |
bc3b14cb2 inode: convert in... |
704 705 |
struct list_head *freeable = arg; struct inode *inode = container_of(item, struct inode, i_lru); |
1da177e4c Linux-2.6.12-rc2 |
706 |
|
bc3b14cb2 inode: convert in... |
707 708 709 710 711 712 |
/* * we are inverting the lru lock/inode->i_lock here, so use a trylock. * If we fail to get the lock, just skip it. */ if (!spin_trylock(&inode->i_lock)) return LRU_SKIP; |
1da177e4c Linux-2.6.12-rc2 |
713 |
|
bc3b14cb2 inode: convert in... |
714 715 716 717 718 719 |
/* * Referenced or dirty inodes are still in use. Give them another pass * through the LRU as we canot reclaim them now. */ if (atomic_read(&inode->i_count) || (inode->i_state & ~I_REFERENCED)) { |
3f97b1632 list_lru: add hel... |
720 |
list_lru_isolate(lru, &inode->i_lru); |
bc3b14cb2 inode: convert in... |
721 722 723 724 |
spin_unlock(&inode->i_lock); this_cpu_dec(nr_unused); return LRU_REMOVED; } |
1da177e4c Linux-2.6.12-rc2 |
725 |
|
69056ee6a Revert "mm: don't... |
726 727 |
/* recently referenced inodes get one more pass */ if (inode->i_state & I_REFERENCED) { |
bc3b14cb2 inode: convert in... |
728 729 730 731 |
inode->i_state &= ~I_REFERENCED; spin_unlock(&inode->i_lock); return LRU_ROTATE; } |
1da177e4c Linux-2.6.12-rc2 |
732 |
|
bc3b14cb2 inode: convert in... |
733 734 735 736 737 738 739 740 741 742 743 744 745 |
if (inode_has_buffers(inode) || inode->i_data.nrpages) { __iget(inode); spin_unlock(&inode->i_lock); spin_unlock(lru_lock); if (remove_inode_buffers(inode)) { unsigned long reap; reap = invalidate_mapping_pages(&inode->i_data, 0, -1); if (current_is_kswapd()) __count_vm_events(KSWAPD_INODESTEAL, reap); else __count_vm_events(PGINODESTEAL, reap); if (current->reclaim_state) current->reclaim_state->reclaimed_slab += reap; |
02afc410f fs: Lock the inod... |
746 |
} |
bc3b14cb2 inode: convert in... |
747 748 749 750 |
iput(inode); spin_lock(lru_lock); return LRU_RETRY; } |
02afc410f fs: Lock the inod... |
751 |
|
bc3b14cb2 inode: convert in... |
752 753 |
WARN_ON(inode->i_state & I_NEW); inode->i_state |= I_FREEING; |
3f97b1632 list_lru: add hel... |
754 |
list_lru_isolate_move(lru, &inode->i_lru, freeable); |
bc3b14cb2 inode: convert in... |
755 |
spin_unlock(&inode->i_lock); |
9e38d86ff fs: Implement laz... |
756 |
|
bc3b14cb2 inode: convert in... |
757 758 759 |
this_cpu_dec(nr_unused); return LRU_REMOVED; } |
7ccf19a80 fs: inode split I... |
760 |
|
bc3b14cb2 inode: convert in... |
761 762 763 764 765 766 |
/* * Walk the superblock inode LRU for freeable inodes and attempt to free them. * This is called from the superblock shrinker function with a number of inodes * to trim from the LRU. Inodes to be freed are moved to a temporary list and * then are freed outside inode_lock by dispose_list(). */ |
503c358cf list_lru: introdu... |
767 |
long prune_icache_sb(struct super_block *sb, struct shrink_control *sc) |
bc3b14cb2 inode: convert in... |
768 769 770 |
{ LIST_HEAD(freeable); long freed; |
1da177e4c Linux-2.6.12-rc2 |
771 |
|
503c358cf list_lru: introdu... |
772 773 |
freed = list_lru_shrink_walk(&sb->s_inode_lru, sc, inode_lru_isolate, &freeable); |
1da177e4c Linux-2.6.12-rc2 |
774 |
dispose_list(&freeable); |
0a234c6dc shrinker: convert... |
775 |
return freed; |
1da177e4c Linux-2.6.12-rc2 |
776 |
} |
1da177e4c Linux-2.6.12-rc2 |
777 778 779 |
static void __wait_on_freeing_inode(struct inode *inode); /* * Called with the inode lock held. |
1da177e4c Linux-2.6.12-rc2 |
780 |
*/ |
6b3304b53 Make checkpatch.p... |
781 782 783 784 |
static struct inode *find_inode(struct super_block *sb, struct hlist_head *head, int (*test)(struct inode *, void *), void *data) |
1da177e4c Linux-2.6.12-rc2 |
785 |
{ |
6b3304b53 Make checkpatch.p... |
786 |
struct inode *inode = NULL; |
1da177e4c Linux-2.6.12-rc2 |
787 788 |
repeat: |
b67bfe0d4 hlist: drop the n... |
789 |
hlist_for_each_entry(inode, head, i_hash) { |
5a3cd9928 iget/iget5: don't... |
790 |
if (inode->i_sb != sb) |
1da177e4c Linux-2.6.12-rc2 |
791 |
continue; |
5a3cd9928 iget/iget5: don't... |
792 |
if (!test(inode, data)) |
1da177e4c Linux-2.6.12-rc2 |
793 |
continue; |
5a3cd9928 iget/iget5: don't... |
794 |
spin_lock(&inode->i_lock); |
a4ffdde6e simplify checks f... |
795 |
if (inode->i_state & (I_FREEING|I_WILL_FREE)) { |
1da177e4c Linux-2.6.12-rc2 |
796 797 798 |
__wait_on_freeing_inode(inode); goto repeat; } |
c2b6d621c new primitive: di... |
799 800 801 802 |
if (unlikely(inode->i_state & I_CREATING)) { spin_unlock(&inode->i_lock); return ERR_PTR(-ESTALE); } |
f7899bd54 fs: move i_count ... |
803 |
__iget(inode); |
250df6ed2 fs: protect inode... |
804 |
spin_unlock(&inode->i_lock); |
f7899bd54 fs: move i_count ... |
805 |
return inode; |
1da177e4c Linux-2.6.12-rc2 |
806 |
} |
f7899bd54 fs: move i_count ... |
807 |
return NULL; |
1da177e4c Linux-2.6.12-rc2 |
808 809 810 811 812 813 |
} /* * find_inode_fast is the fast path version of find_inode, see the comment at * iget_locked for details. */ |
6b3304b53 Make checkpatch.p... |
814 815 |
static struct inode *find_inode_fast(struct super_block *sb, struct hlist_head *head, unsigned long ino) |
1da177e4c Linux-2.6.12-rc2 |
816 |
{ |
6b3304b53 Make checkpatch.p... |
817 |
struct inode *inode = NULL; |
1da177e4c Linux-2.6.12-rc2 |
818 819 |
repeat: |
b67bfe0d4 hlist: drop the n... |
820 |
hlist_for_each_entry(inode, head, i_hash) { |
5a3cd9928 iget/iget5: don't... |
821 |
if (inode->i_ino != ino) |
1da177e4c Linux-2.6.12-rc2 |
822 |
continue; |
5a3cd9928 iget/iget5: don't... |
823 |
if (inode->i_sb != sb) |
1da177e4c Linux-2.6.12-rc2 |
824 |
continue; |
5a3cd9928 iget/iget5: don't... |
825 |
spin_lock(&inode->i_lock); |
a4ffdde6e simplify checks f... |
826 |
if (inode->i_state & (I_FREEING|I_WILL_FREE)) { |
1da177e4c Linux-2.6.12-rc2 |
827 828 829 |
__wait_on_freeing_inode(inode); goto repeat; } |
c2b6d621c new primitive: di... |
830 831 832 833 |
if (unlikely(inode->i_state & I_CREATING)) { spin_unlock(&inode->i_lock); return ERR_PTR(-ESTALE); } |
f7899bd54 fs: move i_count ... |
834 |
__iget(inode); |
250df6ed2 fs: protect inode... |
835 |
spin_unlock(&inode->i_lock); |
f7899bd54 fs: move i_count ... |
836 |
return inode; |
1da177e4c Linux-2.6.12-rc2 |
837 |
} |
f7899bd54 fs: move i_count ... |
838 |
return NULL; |
8290c35f8 Inode: Allow exte... |
839 |
} |
f991bd2e1 fs: introduce a p... |
840 841 842 843 |
/* * Each cpu owns a range of LAST_INO_BATCH numbers. * 'shared_last_ino' is dirtied only once out of LAST_INO_BATCH allocations, * to renew the exhausted range. |
8290c35f8 Inode: Allow exte... |
844 |
* |
f991bd2e1 fs: introduce a p... |
845 846 847 848 849 850 851 852 853 |
* This does not significantly increase overflow rate because every CPU can * consume at most LAST_INO_BATCH-1 unused inode numbers. So there is * NR_CPUS*(LAST_INO_BATCH-1) wastage. At 4096 and 1024, this is ~0.1% of the * 2^32 range, and is a worst-case. Even a 50% wastage would only increase * overflow rate by 2x, which does not seem too significant. * * On a 32bit, non LFS stat() call, glibc will generate an EOVERFLOW * error if st_ino won't fit in target struct field. Use 32bit counter * here to attempt to avoid that. |
8290c35f8 Inode: Allow exte... |
854 |
*/ |
f991bd2e1 fs: introduce a p... |
855 856 |
#define LAST_INO_BATCH 1024 static DEFINE_PER_CPU(unsigned int, last_ino); |
85fe4025c fs: do not assign... |
857 |
unsigned int get_next_ino(void) |
8290c35f8 Inode: Allow exte... |
858 |
{ |
f991bd2e1 fs: introduce a p... |
859 860 |
unsigned int *p = &get_cpu_var(last_ino); unsigned int res = *p; |
8290c35f8 Inode: Allow exte... |
861 |
|
f991bd2e1 fs: introduce a p... |
862 863 864 865 866 867 868 869 |
#ifdef CONFIG_SMP if (unlikely((res & (LAST_INO_BATCH-1)) == 0)) { static atomic_t shared_last_ino; int next = atomic_add_return(LAST_INO_BATCH, &shared_last_ino); res = next - LAST_INO_BATCH; } #endif |
2adc376c5 vfs: avoid creati... |
870 871 872 873 874 |
res++; /* get_next_ino should not provide a 0 inode number */ if (unlikely(!res)) res++; *p = res; |
f991bd2e1 fs: introduce a p... |
875 876 |
put_cpu_var(last_ino); return res; |
8290c35f8 Inode: Allow exte... |
877 |
} |
85fe4025c fs: do not assign... |
878 |
EXPORT_SYMBOL(get_next_ino); |
8290c35f8 Inode: Allow exte... |
879 |
|
1da177e4c Linux-2.6.12-rc2 |
880 |
/** |
a209dfc7b vfs: dont chain p... |
881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 |
* new_inode_pseudo - obtain an inode * @sb: superblock * * Allocates a new inode for given superblock. * Inode wont be chained in superblock s_inodes list * This means : * - fs can't be unmount * - quotas, fsnotify, writeback can't work */ struct inode *new_inode_pseudo(struct super_block *sb) { struct inode *inode = alloc_inode(sb); if (inode) { spin_lock(&inode->i_lock); inode->i_state = 0; spin_unlock(&inode->i_lock); INIT_LIST_HEAD(&inode->i_sb_list); } return inode; } /** |
1da177e4c Linux-2.6.12-rc2 |
904 905 906 |
* new_inode - obtain an inode * @sb: superblock * |
769848c03 Add __GFP_MOVABLE... |
907 |
* Allocates a new inode for given superblock. The default gfp_mask |
3c1d43787 mm: remove GFP_HI... |
908 |
* for allocations related to inode->i_mapping is GFP_HIGHUSER_MOVABLE. |
769848c03 Add __GFP_MOVABLE... |
909 910 911 912 913 |
* If HIGHMEM pages are unsuitable or it is known that pages allocated * for the page cache are not reclaimable or migratable, * mapping_set_gfp_mask() must be called with suitable flags on the * newly created inode's mapping * |
1da177e4c Linux-2.6.12-rc2 |
914 915 916 |
*/ struct inode *new_inode(struct super_block *sb) { |
6b3304b53 Make checkpatch.p... |
917 |
struct inode *inode; |
1da177e4c Linux-2.6.12-rc2 |
918 |
|
74278da9f inode: convert in... |
919 |
spin_lock_prefetch(&sb->s_inode_list_lock); |
6b3304b53 Make checkpatch.p... |
920 |
|
a209dfc7b vfs: dont chain p... |
921 922 |
inode = new_inode_pseudo(sb); if (inode) |
55fa6091d fs: move i_sb_lis... |
923 |
inode_sb_list_add(inode); |
1da177e4c Linux-2.6.12-rc2 |
924 925 |
return inode; } |
1da177e4c Linux-2.6.12-rc2 |
926 |
EXPORT_SYMBOL(new_inode); |
14358e6dd lockdep: annotate... |
927 |
#ifdef CONFIG_DEBUG_LOCK_ALLOC |
e096d0c7e lockdep: Add help... |
928 929 |
void lockdep_annotate_inode_mutex_key(struct inode *inode) { |
a3314a0ed lockdep: fixup ch... |
930 |
if (S_ISDIR(inode->i_mode)) { |
1e89a5e15 lockdep: fixup th... |
931 |
struct file_system_type *type = inode->i_sb->s_type; |
9a7aa12f3 vfs: Set special ... |
932 |
/* Set new key only if filesystem hasn't already changed it */ |
9902af79c parallel lookups:... |
933 |
if (lockdep_match_class(&inode->i_rwsem, &type->i_mutex_key)) { |
9a7aa12f3 vfs: Set special ... |
934 935 936 |
/* * ensure nobody is actually holding i_mutex */ |
9902af79c parallel lookups:... |
937 938 939 |
// mutex_destroy(&inode->i_mutex); init_rwsem(&inode->i_rwsem); lockdep_set_class(&inode->i_rwsem, |
9a7aa12f3 vfs: Set special ... |
940 941 |
&type->i_mutex_dir_key); } |
1e89a5e15 lockdep: fixup th... |
942 |
} |
e096d0c7e lockdep: Add help... |
943 944 |
} EXPORT_SYMBOL(lockdep_annotate_inode_mutex_key); |
14358e6dd lockdep: annotate... |
945 |
#endif |
e096d0c7e lockdep: Add help... |
946 947 948 949 950 951 952 953 954 955 956 |
/** * unlock_new_inode - clear the I_NEW state and wake up any waiters * @inode: new inode to unlock * * Called when the inode is fully initialised to clear the new state of the * inode and wake up anyone waiting for the inode to finish initialisation. */ void unlock_new_inode(struct inode *inode) { lockdep_annotate_inode_mutex_key(inode); |
250df6ed2 fs: protect inode... |
957 |
spin_lock(&inode->i_lock); |
eaff8079d kill I_LOCK |
958 |
WARN_ON(!(inode->i_state & I_NEW)); |
c2b6d621c new primitive: di... |
959 |
inode->i_state &= ~I_NEW & ~I_CREATING; |
310fa7a36 restore smp_mb() ... |
960 |
smp_mb(); |
250df6ed2 fs: protect inode... |
961 962 |
wake_up_bit(&inode->i_state, __I_NEW); spin_unlock(&inode->i_lock); |
1da177e4c Linux-2.6.12-rc2 |
963 |
} |
1da177e4c Linux-2.6.12-rc2 |
964 |
EXPORT_SYMBOL(unlock_new_inode); |
c2b6d621c new primitive: di... |
965 966 967 968 969 970 971 972 973 974 975 976 |
void discard_new_inode(struct inode *inode) { lockdep_annotate_inode_mutex_key(inode); spin_lock(&inode->i_lock); WARN_ON(!(inode->i_state & I_NEW)); inode->i_state &= ~I_NEW; smp_mb(); wake_up_bit(&inode->i_state, __I_NEW); spin_unlock(&inode->i_lock); iput(inode); } EXPORT_SYMBOL(discard_new_inode); |
0b2d0724e fs: simplify iget... |
977 |
/** |
375e289ea vfs: pull ext4's ... |
978 |
* lock_two_nondirectories - take two i_mutexes on non-directory objects |
4fd699ae3 vfs: lock_two_non... |
979 980 981 982 |
* * Lock any non-NULL argument that is not a directory. * Zero, one or two objects may be locked by this function. * |
375e289ea vfs: pull ext4's ... |
983 984 985 986 987 |
* @inode1: first inode to lock * @inode2: second inode to lock */ void lock_two_nondirectories(struct inode *inode1, struct inode *inode2) { |
4fd699ae3 vfs: lock_two_non... |
988 989 990 991 |
if (inode1 > inode2) swap(inode1, inode2); if (inode1 && !S_ISDIR(inode1->i_mode)) |
5955102c9 wrappers for ->i_... |
992 |
inode_lock(inode1); |
4fd699ae3 vfs: lock_two_non... |
993 |
if (inode2 && !S_ISDIR(inode2->i_mode) && inode2 != inode1) |
5955102c9 wrappers for ->i_... |
994 |
inode_lock_nested(inode2, I_MUTEX_NONDIR2); |
375e289ea vfs: pull ext4's ... |
995 996 997 998 999 1000 1001 1002 1003 1004 |
} EXPORT_SYMBOL(lock_two_nondirectories); /** * unlock_two_nondirectories - release locks from lock_two_nondirectories() * @inode1: first inode to unlock * @inode2: second inode to unlock */ void unlock_two_nondirectories(struct inode *inode1, struct inode *inode2) { |
4fd699ae3 vfs: lock_two_non... |
1005 |
if (inode1 && !S_ISDIR(inode1->i_mode)) |
5955102c9 wrappers for ->i_... |
1006 |
inode_unlock(inode1); |
4fd699ae3 vfs: lock_two_non... |
1007 |
if (inode2 && !S_ISDIR(inode2->i_mode) && inode2 != inode1) |
5955102c9 wrappers for ->i_... |
1008 |
inode_unlock(inode2); |
375e289ea vfs: pull ext4's ... |
1009 1010 1011 1012 |
} EXPORT_SYMBOL(unlock_two_nondirectories); /** |
80ea09a00 vfs: factor out i... |
1013 1014 1015 1016 1017 1018 1019 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 |
* inode_insert5 - obtain an inode from a mounted file system * @inode: pre-allocated inode to use for insert to cache * @hashval: hash value (usually inode number) to get * @test: callback used for comparisons between inodes * @set: callback used to initialize a new struct inode * @data: opaque data pointer to pass to @test and @set * * Search for the inode specified by @hashval and @data in the inode cache, * and if present it is return it with an increased reference count. This is * a variant of iget5_locked() for callers that don't want to fail on memory * allocation of inode. * * If the inode is not in cache, insert the pre-allocated inode to cache and * return it locked, hashed, and with the I_NEW flag set. The file system gets * to fill it in before unlocking it via unlock_new_inode(). * * Note both @test and @set are called with the inode_hash_lock held, so can't * sleep. */ struct inode *inode_insert5(struct inode *inode, unsigned long hashval, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *data) { struct hlist_head *head = inode_hashtable + hash(inode->i_sb, hashval); struct inode *old; |
e950564b9 vfs: don't evict ... |
1038 |
bool creating = inode->i_state & I_CREATING; |
80ea09a00 vfs: factor out i... |
1039 1040 1041 1042 1043 1044 1045 1046 1047 1048 |
again: spin_lock(&inode_hash_lock); old = find_inode(inode->i_sb, head, test, data); if (unlikely(old)) { /* * Uhhuh, somebody else created the same inode under us. * Use the old inode instead of the preallocated one. */ spin_unlock(&inode_hash_lock); |
c2b6d621c new primitive: di... |
1049 1050 |
if (IS_ERR(old)) return NULL; |
80ea09a00 vfs: factor out i... |
1051 1052 1053 1054 1055 1056 1057 1058 1059 1060 1061 1062 1063 1064 1065 1066 1067 1068 1069 1070 1071 |
wait_on_inode(old); if (unlikely(inode_unhashed(old))) { iput(old); goto again; } return old; } if (set && unlikely(set(inode, data))) { inode = NULL; goto unlock; } /* * Return the locked inode with I_NEW set, the * caller is responsible for filling in the contents */ spin_lock(&inode->i_lock); inode->i_state |= I_NEW; hlist_add_head(&inode->i_hash, head); spin_unlock(&inode->i_lock); |
e950564b9 vfs: don't evict ... |
1072 1073 |
if (!creating) inode_sb_list_add(inode); |
80ea09a00 vfs: factor out i... |
1074 1075 1076 1077 1078 1079 1080 1081 |
unlock: spin_unlock(&inode_hash_lock); return inode; } EXPORT_SYMBOL(inode_insert5); /** |
0b2d0724e fs: simplify iget... |
1082 1083 1084 1085 1086 1087 1088 1089 1090 1091 1092 1093 1094 1095 1096 |
* iget5_locked - obtain an inode from a mounted file system * @sb: super block of file system * @hashval: hash value (usually inode number) to get * @test: callback used for comparisons between inodes * @set: callback used to initialize a new struct inode * @data: opaque data pointer to pass to @test and @set * * Search for the inode specified by @hashval and @data in the inode cache, * and if present it is return it with an increased reference count. This is * a generalized version of iget_locked() for file systems where the inode * number is not sufficient for unique identification of an inode. * * If the inode is not in cache, allocate a new inode and return it locked, * hashed, and with the I_NEW flag set. The file system gets to fill it in * before unlocking it via unlock_new_inode(). |
1da177e4c Linux-2.6.12-rc2 |
1097 |
* |
0b2d0724e fs: simplify iget... |
1098 1099 |
* Note both @test and @set are called with the inode_hash_lock held, so can't * sleep. |
1da177e4c Linux-2.6.12-rc2 |
1100 |
*/ |
0b2d0724e fs: simplify iget... |
1101 1102 1103 |
struct inode *iget5_locked(struct super_block *sb, unsigned long hashval, int (*test)(struct inode *, void *), int (*set)(struct inode *, void *), void *data) |
1da177e4c Linux-2.6.12-rc2 |
1104 |
{ |
80ea09a00 vfs: factor out i... |
1105 |
struct inode *inode = ilookup5(sb, hashval, test, data); |
0b2d0724e fs: simplify iget... |
1106 |
|
80ea09a00 vfs: factor out i... |
1107 |
if (!inode) { |
e950564b9 vfs: don't evict ... |
1108 |
struct inode *new = alloc_inode(sb); |
0b2d0724e fs: simplify iget... |
1109 |
|
80ea09a00 vfs: factor out i... |
1110 |
if (new) { |
e950564b9 vfs: don't evict ... |
1111 |
new->i_state = 0; |
80ea09a00 vfs: factor out i... |
1112 1113 |
inode = inode_insert5(new, hashval, test, set, data); if (unlikely(inode != new)) |
e950564b9 vfs: don't evict ... |
1114 |
destroy_inode(new); |
2864f3014 iget_locked et.al... |
1115 |
} |
1da177e4c Linux-2.6.12-rc2 |
1116 1117 |
} return inode; |
1da177e4c Linux-2.6.12-rc2 |
1118 |
} |
0b2d0724e fs: simplify iget... |
1119 |
EXPORT_SYMBOL(iget5_locked); |
1da177e4c Linux-2.6.12-rc2 |
1120 |
|
0b2d0724e fs: simplify iget... |
1121 1122 1123 1124 1125 1126 1127 1128 1129 1130 1131 1132 |
/** * iget_locked - obtain an inode from a mounted file system * @sb: super block of file system * @ino: inode number to get * * Search for the inode specified by @ino in the inode cache and if present * return it with an increased reference count. This is for file systems * where the inode number is sufficient for unique identification of an inode. * * If the inode is not in cache, allocate a new inode and return it locked, * hashed, and with the I_NEW flag set. The file system gets to fill it in * before unlocking it via unlock_new_inode(). |
1da177e4c Linux-2.6.12-rc2 |
1133 |
*/ |
0b2d0724e fs: simplify iget... |
1134 |
struct inode *iget_locked(struct super_block *sb, unsigned long ino) |
1da177e4c Linux-2.6.12-rc2 |
1135 |
{ |
0b2d0724e fs: simplify iget... |
1136 |
struct hlist_head *head = inode_hashtable + hash(sb, ino); |
6b3304b53 Make checkpatch.p... |
1137 |
struct inode *inode; |
2864f3014 iget_locked et.al... |
1138 |
again: |
0b2d0724e fs: simplify iget... |
1139 1140 1141 1142 |
spin_lock(&inode_hash_lock); inode = find_inode_fast(sb, head, ino); spin_unlock(&inode_hash_lock); if (inode) { |
c2b6d621c new primitive: di... |
1143 1144 |
if (IS_ERR(inode)) return NULL; |
0b2d0724e fs: simplify iget... |
1145 |
wait_on_inode(inode); |
2864f3014 iget_locked et.al... |
1146 1147 1148 1149 |
if (unlikely(inode_unhashed(inode))) { iput(inode); goto again; } |
0b2d0724e fs: simplify iget... |
1150 1151 |
return inode; } |
1da177e4c Linux-2.6.12-rc2 |
1152 1153 |
inode = alloc_inode(sb); if (inode) { |
6b3304b53 Make checkpatch.p... |
1154 |
struct inode *old; |
1da177e4c Linux-2.6.12-rc2 |
1155 |
|
67a23c494 fs: rename inode_... |
1156 |
spin_lock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
1157 1158 1159 1160 |
/* We released the lock, so.. */ old = find_inode_fast(sb, head, ino); if (!old) { inode->i_ino = ino; |
250df6ed2 fs: protect inode... |
1161 1162 |
spin_lock(&inode->i_lock); inode->i_state = I_NEW; |
646ec4615 fs: remove inode_... |
1163 |
hlist_add_head(&inode->i_hash, head); |
250df6ed2 fs: protect inode... |
1164 |
spin_unlock(&inode->i_lock); |
55fa6091d fs: move i_sb_lis... |
1165 |
inode_sb_list_add(inode); |
67a23c494 fs: rename inode_... |
1166 |
spin_unlock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
1167 1168 1169 1170 1171 1172 1173 1174 1175 1176 1177 1178 |
/* Return the locked inode with I_NEW set, the * caller is responsible for filling in the contents */ return inode; } /* * Uhhuh, somebody else created the same inode under * us. Use the old inode instead of the one we just * allocated. */ |
67a23c494 fs: rename inode_... |
1179 |
spin_unlock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
1180 |
destroy_inode(inode); |
c2b6d621c new primitive: di... |
1181 1182 |
if (IS_ERR(old)) return NULL; |
1da177e4c Linux-2.6.12-rc2 |
1183 1184 |
inode = old; wait_on_inode(inode); |
2864f3014 iget_locked et.al... |
1185 1186 1187 1188 |
if (unlikely(inode_unhashed(inode))) { iput(inode); goto again; } |
1da177e4c Linux-2.6.12-rc2 |
1189 1190 1191 |
} return inode; } |
0b2d0724e fs: simplify iget... |
1192 |
EXPORT_SYMBOL(iget_locked); |
1da177e4c Linux-2.6.12-rc2 |
1193 |
|
ad5e195ac fs: Stop abusing ... |
1194 1195 1196 1197 1198 1199 1200 1201 1202 1203 |
/* * search the inode cache for a matching inode number. * If we find one, then the inode number we are trying to * allocate is not unique and so we should not use it. * * Returns 1 if the inode number is unique, 0 if it is not. */ static int test_inode_iunique(struct super_block *sb, unsigned long ino) { struct hlist_head *b = inode_hashtable + hash(sb, ino); |
ad5e195ac fs: Stop abusing ... |
1204 |
struct inode *inode; |
67a23c494 fs: rename inode_... |
1205 |
spin_lock(&inode_hash_lock); |
b67bfe0d4 hlist: drop the n... |
1206 |
hlist_for_each_entry(inode, b, i_hash) { |
67a23c494 fs: rename inode_... |
1207 1208 |
if (inode->i_ino == ino && inode->i_sb == sb) { spin_unlock(&inode_hash_lock); |
ad5e195ac fs: Stop abusing ... |
1209 |
return 0; |
67a23c494 fs: rename inode_... |
1210 |
} |
ad5e195ac fs: Stop abusing ... |
1211 |
} |
67a23c494 fs: rename inode_... |
1212 |
spin_unlock(&inode_hash_lock); |
ad5e195ac fs: Stop abusing ... |
1213 1214 1215 |
return 1; } |
1da177e4c Linux-2.6.12-rc2 |
1216 1217 1218 1219 1220 1221 1222 1223 1224 1225 1226 1227 1228 1229 1230 1231 |
/** * iunique - get a unique inode number * @sb: superblock * @max_reserved: highest reserved inode number * * Obtain an inode number that is unique on the system for a given * superblock. This is used by file systems that have no natural * permanent inode numbering system. An inode number is returned that * is higher than the reserved limit but unique. * * BUGS: * With a large number of inodes live on the file system this function * currently becomes quite slow. */ ino_t iunique(struct super_block *sb, ino_t max_reserved) { |
866b04fcc inode numbering: ... |
1232 1233 1234 1235 1236 |
/* * On a 32bit, non LFS stat() call, glibc will generate an EOVERFLOW * error if st_ino won't fit in target struct field. Use 32bit counter * here to attempt to avoid that. */ |
ad5e195ac fs: Stop abusing ... |
1237 |
static DEFINE_SPINLOCK(iunique_lock); |
866b04fcc inode numbering: ... |
1238 |
static unsigned int counter; |
1da177e4c Linux-2.6.12-rc2 |
1239 |
ino_t res; |
3361c7beb make iunique use ... |
1240 |
|
ad5e195ac fs: Stop abusing ... |
1241 |
spin_lock(&iunique_lock); |
3361c7beb make iunique use ... |
1242 1243 1244 |
do { if (counter <= max_reserved) counter = max_reserved + 1; |
1da177e4c Linux-2.6.12-rc2 |
1245 |
res = counter++; |
ad5e195ac fs: Stop abusing ... |
1246 1247 |
} while (!test_inode_iunique(sb, res)); spin_unlock(&iunique_lock); |
1da177e4c Linux-2.6.12-rc2 |
1248 |
|
3361c7beb make iunique use ... |
1249 1250 |
return res; } |
1da177e4c Linux-2.6.12-rc2 |
1251 1252 1253 1254 |
EXPORT_SYMBOL(iunique); struct inode *igrab(struct inode *inode) { |
250df6ed2 fs: protect inode... |
1255 1256 |
spin_lock(&inode->i_lock); if (!(inode->i_state & (I_FREEING|I_WILL_FREE))) { |
1da177e4c Linux-2.6.12-rc2 |
1257 |
__iget(inode); |
250df6ed2 fs: protect inode... |
1258 1259 1260 |
spin_unlock(&inode->i_lock); } else { spin_unlock(&inode->i_lock); |
1da177e4c Linux-2.6.12-rc2 |
1261 1262 1263 1264 1265 1266 |
/* * Handle the case where s_op->clear_inode is not been * called yet, and somebody is calling igrab * while the inode is getting freed. */ inode = NULL; |
250df6ed2 fs: protect inode... |
1267 |
} |
1da177e4c Linux-2.6.12-rc2 |
1268 1269 |
return inode; } |
1da177e4c Linux-2.6.12-rc2 |
1270 1271 1272 |
EXPORT_SYMBOL(igrab); /** |
0b2d0724e fs: simplify iget... |
1273 |
* ilookup5_nowait - search for an inode in the inode cache |
1da177e4c Linux-2.6.12-rc2 |
1274 |
* @sb: super block of file system to search |
0b2d0724e fs: simplify iget... |
1275 |
* @hashval: hash value (usually inode number) to search for |
1da177e4c Linux-2.6.12-rc2 |
1276 1277 |
* @test: callback used for comparisons between inodes * @data: opaque data pointer to pass to @test |
1da177e4c Linux-2.6.12-rc2 |
1278 |
* |
0b2d0724e fs: simplify iget... |
1279 |
* Search for the inode specified by @hashval and @data in the inode cache. |
1da177e4c Linux-2.6.12-rc2 |
1280 1281 1282 |
* If the inode is in the cache, the inode is returned with an incremented * reference count. * |
0b2d0724e fs: simplify iget... |
1283 1284 |
* Note: I_NEW is not waited upon so you have to be very careful what you do * with the returned inode. You probably should be using ilookup5() instead. |
1da177e4c Linux-2.6.12-rc2 |
1285 |
* |
b6d0ad686 fs: fix inode.c k... |
1286 |
* Note2: @test is called with the inode_hash_lock held, so can't sleep. |
1da177e4c Linux-2.6.12-rc2 |
1287 |
*/ |
0b2d0724e fs: simplify iget... |
1288 1289 |
struct inode *ilookup5_nowait(struct super_block *sb, unsigned long hashval, int (*test)(struct inode *, void *), void *data) |
1da177e4c Linux-2.6.12-rc2 |
1290 |
{ |
0b2d0724e fs: simplify iget... |
1291 |
struct hlist_head *head = inode_hashtable + hash(sb, hashval); |
1da177e4c Linux-2.6.12-rc2 |
1292 |
struct inode *inode; |
67a23c494 fs: rename inode_... |
1293 |
spin_lock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
1294 |
inode = find_inode(sb, head, test, data); |
67a23c494 fs: rename inode_... |
1295 |
spin_unlock(&inode_hash_lock); |
88bd5121d [PATCH] Fix soft ... |
1296 |
|
c2b6d621c new primitive: di... |
1297 |
return IS_ERR(inode) ? NULL : inode; |
88bd5121d [PATCH] Fix soft ... |
1298 |
} |
88bd5121d [PATCH] Fix soft ... |
1299 1300 1301 1302 1303 1304 1305 1306 1307 |
EXPORT_SYMBOL(ilookup5_nowait); /** * ilookup5 - search for an inode in the inode cache * @sb: super block of file system to search * @hashval: hash value (usually inode number) to search for * @test: callback used for comparisons between inodes * @data: opaque data pointer to pass to @test * |
0b2d0724e fs: simplify iget... |
1308 1309 1310 |
* Search for the inode specified by @hashval and @data in the inode cache, * and if the inode is in the cache, return the inode with an incremented * reference count. Waits on I_NEW before returning the inode. |
88bd5121d [PATCH] Fix soft ... |
1311 |
* returned with an incremented reference count. |
1da177e4c Linux-2.6.12-rc2 |
1312 |
* |
0b2d0724e fs: simplify iget... |
1313 1314 |
* This is a generalized version of ilookup() for file systems where the * inode number is not sufficient for unique identification of an inode. |
1da177e4c Linux-2.6.12-rc2 |
1315 |
* |
0b2d0724e fs: simplify iget... |
1316 |
* Note: @test is called with the inode_hash_lock held, so can't sleep. |
1da177e4c Linux-2.6.12-rc2 |
1317 1318 1319 1320 |
*/ struct inode *ilookup5(struct super_block *sb, unsigned long hashval, int (*test)(struct inode *, void *), void *data) { |
2864f3014 iget_locked et.al... |
1321 1322 1323 1324 |
struct inode *inode; again: inode = ilookup5_nowait(sb, hashval, test, data); if (inode) { |
0b2d0724e fs: simplify iget... |
1325 |
wait_on_inode(inode); |
2864f3014 iget_locked et.al... |
1326 1327 1328 1329 1330 |
if (unlikely(inode_unhashed(inode))) { iput(inode); goto again; } } |
0b2d0724e fs: simplify iget... |
1331 |
return inode; |
1da177e4c Linux-2.6.12-rc2 |
1332 |
} |
1da177e4c Linux-2.6.12-rc2 |
1333 1334 1335 1336 1337 1338 1339 |
EXPORT_SYMBOL(ilookup5); /** * ilookup - search for an inode in the inode cache * @sb: super block of file system to search * @ino: inode number to search for * |
0b2d0724e fs: simplify iget... |
1340 1341 |
* Search for the inode @ino in the inode cache, and if the inode is in the * cache, the inode is returned with an incremented reference count. |
1da177e4c Linux-2.6.12-rc2 |
1342 1343 1344 1345 |
*/ struct inode *ilookup(struct super_block *sb, unsigned long ino) { struct hlist_head *head = inode_hashtable + hash(sb, ino); |
1da177e4c Linux-2.6.12-rc2 |
1346 |
struct inode *inode; |
2864f3014 iget_locked et.al... |
1347 |
again: |
0b2d0724e fs: simplify iget... |
1348 1349 1350 |
spin_lock(&inode_hash_lock); inode = find_inode_fast(sb, head, ino); spin_unlock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
1351 |
|
2864f3014 iget_locked et.al... |
1352 |
if (inode) { |
c2b6d621c new primitive: di... |
1353 1354 |
if (IS_ERR(inode)) return NULL; |
0b2d0724e fs: simplify iget... |
1355 |
wait_on_inode(inode); |
2864f3014 iget_locked et.al... |
1356 1357 1358 1359 1360 |
if (unlikely(inode_unhashed(inode))) { iput(inode); goto again; } } |
0b2d0724e fs: simplify iget... |
1361 |
return inode; |
1da177e4c Linux-2.6.12-rc2 |
1362 |
} |
0b2d0724e fs: simplify iget... |
1363 |
EXPORT_SYMBOL(ilookup); |
1da177e4c Linux-2.6.12-rc2 |
1364 |
|
fe032c422 vfs: add find_ino... |
1365 1366 1367 1368 1369 1370 1371 1372 1373 1374 1375 1376 1377 1378 1379 1380 1381 1382 1383 1384 1385 1386 1387 1388 1389 1390 1391 1392 1393 1394 1395 1396 1397 1398 1399 1400 1401 1402 1403 1404 1405 1406 1407 1408 1409 1410 1411 1412 1413 |
/** * find_inode_nowait - find an inode in the inode cache * @sb: super block of file system to search * @hashval: hash value (usually inode number) to search for * @match: callback used for comparisons between inodes * @data: opaque data pointer to pass to @match * * Search for the inode specified by @hashval and @data in the inode * cache, where the helper function @match will return 0 if the inode * does not match, 1 if the inode does match, and -1 if the search * should be stopped. The @match function must be responsible for * taking the i_lock spin_lock and checking i_state for an inode being * freed or being initialized, and incrementing the reference count * before returning 1. It also must not sleep, since it is called with * the inode_hash_lock spinlock held. * * This is a even more generalized version of ilookup5() when the * function must never block --- find_inode() can block in * __wait_on_freeing_inode() --- or when the caller can not increment * the reference count because the resulting iput() might cause an * inode eviction. The tradeoff is that the @match funtion must be * very carefully implemented. */ struct inode *find_inode_nowait(struct super_block *sb, unsigned long hashval, int (*match)(struct inode *, unsigned long, void *), void *data) { struct hlist_head *head = inode_hashtable + hash(sb, hashval); struct inode *inode, *ret_inode = NULL; int mval; spin_lock(&inode_hash_lock); hlist_for_each_entry(inode, head, i_hash) { if (inode->i_sb != sb) continue; mval = match(inode, hashval, data); if (mval == 0) continue; if (mval == 1) ret_inode = inode; goto out; } out: spin_unlock(&inode_hash_lock); return ret_inode; } EXPORT_SYMBOL(find_inode_nowait); |
261bca86e nfsd/create race ... |
1414 1415 1416 1417 1418 |
int insert_inode_locked(struct inode *inode) { struct super_block *sb = inode->i_sb; ino_t ino = inode->i_ino; struct hlist_head *head = inode_hashtable + hash(sb, ino); |
261bca86e nfsd/create race ... |
1419 |
|
261bca86e nfsd/create race ... |
1420 |
while (1) { |
72a43d63c ext3/4 with synch... |
1421 |
struct inode *old = NULL; |
67a23c494 fs: rename inode_... |
1422 |
spin_lock(&inode_hash_lock); |
b67bfe0d4 hlist: drop the n... |
1423 |
hlist_for_each_entry(old, head, i_hash) { |
72a43d63c ext3/4 with synch... |
1424 1425 1426 1427 |
if (old->i_ino != ino) continue; if (old->i_sb != sb) continue; |
250df6ed2 fs: protect inode... |
1428 1429 1430 |
spin_lock(&old->i_lock); if (old->i_state & (I_FREEING|I_WILL_FREE)) { spin_unlock(&old->i_lock); |
72a43d63c ext3/4 with synch... |
1431 |
continue; |
250df6ed2 fs: protect inode... |
1432 |
} |
72a43d63c ext3/4 with synch... |
1433 1434 |
break; } |
b67bfe0d4 hlist: drop the n... |
1435 |
if (likely(!old)) { |
250df6ed2 fs: protect inode... |
1436 |
spin_lock(&inode->i_lock); |
c2b6d621c new primitive: di... |
1437 |
inode->i_state |= I_NEW | I_CREATING; |
261bca86e nfsd/create race ... |
1438 |
hlist_add_head(&inode->i_hash, head); |
250df6ed2 fs: protect inode... |
1439 |
spin_unlock(&inode->i_lock); |
67a23c494 fs: rename inode_... |
1440 |
spin_unlock(&inode_hash_lock); |
261bca86e nfsd/create race ... |
1441 1442 |
return 0; } |
c2b6d621c new primitive: di... |
1443 1444 1445 1446 1447 |
if (unlikely(old->i_state & I_CREATING)) { spin_unlock(&old->i_lock); spin_unlock(&inode_hash_lock); return -EBUSY; } |
261bca86e nfsd/create race ... |
1448 |
__iget(old); |
250df6ed2 fs: protect inode... |
1449 |
spin_unlock(&old->i_lock); |
67a23c494 fs: rename inode_... |
1450 |
spin_unlock(&inode_hash_lock); |
261bca86e nfsd/create race ... |
1451 |
wait_on_inode(old); |
1d3382cbf new helper: inode... |
1452 |
if (unlikely(!inode_unhashed(old))) { |
261bca86e nfsd/create race ... |
1453 1454 1455 1456 1457 1458 |
iput(old); return -EBUSY; } iput(old); } } |
261bca86e nfsd/create race ... |
1459 1460 1461 1462 1463 |
EXPORT_SYMBOL(insert_inode_locked); int insert_inode_locked4(struct inode *inode, unsigned long hashval, int (*test)(struct inode *, void *), void *data) { |
c2b6d621c new primitive: di... |
1464 1465 1466 1467 |
struct inode *old; inode->i_state |= I_CREATING; old = inode_insert5(inode, hashval, test, NULL, data); |
261bca86e nfsd/create race ... |
1468 |
|
80ea09a00 vfs: factor out i... |
1469 |
if (old != inode) { |
261bca86e nfsd/create race ... |
1470 |
iput(old); |
80ea09a00 vfs: factor out i... |
1471 |
return -EBUSY; |
261bca86e nfsd/create race ... |
1472 |
} |
80ea09a00 vfs: factor out i... |
1473 |
return 0; |
261bca86e nfsd/create race ... |
1474 |
} |
261bca86e nfsd/create race ... |
1475 |
EXPORT_SYMBOL(insert_inode_locked4); |
1da177e4c Linux-2.6.12-rc2 |
1476 |
|
45321ac54 Make ->drop_inode... |
1477 1478 1479 1480 1481 |
int generic_delete_inode(struct inode *inode) { return 1; } EXPORT_SYMBOL(generic_delete_inode); |
1da177e4c Linux-2.6.12-rc2 |
1482 |
/* |
45321ac54 Make ->drop_inode... |
1483 1484 |
* Called when we're dropping the last reference * to an inode. |
22fe40421 vfs: split generi... |
1485 |
* |
45321ac54 Make ->drop_inode... |
1486 1487 1488 1489 1490 |
* Call the FS "drop_inode()" function, defaulting to * the legacy UNIX filesystem behaviour. If it tells * us to evict inode, do so. Otherwise, retain inode * in cache if fs is alive, sync and evict if fs is * shutting down. |
22fe40421 vfs: split generi... |
1491 |
*/ |
45321ac54 Make ->drop_inode... |
1492 |
static void iput_final(struct inode *inode) |
1da177e4c Linux-2.6.12-rc2 |
1493 1494 |
{ struct super_block *sb = inode->i_sb; |
45321ac54 Make ->drop_inode... |
1495 1496 |
const struct super_operations *op = inode->i_sb->s_op; int drop; |
250df6ed2 fs: protect inode... |
1497 |
WARN_ON(inode->i_state & I_NEW); |
e7f590970 kill useless chec... |
1498 |
if (op->drop_inode) |
45321ac54 Make ->drop_inode... |
1499 1500 1501 |
drop = op->drop_inode(inode); else drop = generic_drop_inode(inode); |
1da177e4c Linux-2.6.12-rc2 |
1502 |
|
1751e8a6c Rename superblock... |
1503 |
if (!drop && (sb->s_flags & SB_ACTIVE)) { |
4eff96dd5 writeback: put un... |
1504 |
inode_add_lru(inode); |
b2b2af8e6 fs: factor inode ... |
1505 |
spin_unlock(&inode->i_lock); |
b2b2af8e6 fs: factor inode ... |
1506 1507 |
return; } |
45321ac54 Make ->drop_inode... |
1508 |
if (!drop) { |
991114c6f [PATCH] fix for p... |
1509 |
inode->i_state |= I_WILL_FREE; |
250df6ed2 fs: protect inode... |
1510 |
spin_unlock(&inode->i_lock); |
1da177e4c Linux-2.6.12-rc2 |
1511 |
write_inode_now(inode, 1); |
250df6ed2 fs: protect inode... |
1512 |
spin_lock(&inode->i_lock); |
7ef0d7377 fs: new inode i_s... |
1513 |
WARN_ON(inode->i_state & I_NEW); |
991114c6f [PATCH] fix for p... |
1514 |
inode->i_state &= ~I_WILL_FREE; |
1da177e4c Linux-2.6.12-rc2 |
1515 |
} |
7ccf19a80 fs: inode split I... |
1516 |
|
991114c6f [PATCH] fix for p... |
1517 |
inode->i_state |= I_FREEING; |
c4ae0c654 vfs: avoid call t... |
1518 1519 |
if (!list_empty(&inode->i_lru)) inode_lru_list_del(inode); |
b2b2af8e6 fs: factor inode ... |
1520 |
spin_unlock(&inode->i_lock); |
b2b2af8e6 fs: factor inode ... |
1521 |
|
644da5960 fs/inode.c:evict(... |
1522 |
evict(inode); |
1da177e4c Linux-2.6.12-rc2 |
1523 |
} |
1da177e4c Linux-2.6.12-rc2 |
1524 |
/** |
6b3304b53 Make checkpatch.p... |
1525 |
* iput - put an inode |
1da177e4c Linux-2.6.12-rc2 |
1526 1527 1528 1529 1530 1531 1532 1533 1534 |
* @inode: inode to put * * Puts an inode, dropping its usage count. If the inode use count hits * zero, the inode is then freed and may also be destroyed. * * Consequently, iput() can sleep. */ void iput(struct inode *inode) { |
0ae45f63d vfs: add support ... |
1535 1536 1537 1538 1539 1540 1541 |
if (!inode) return; BUG_ON(inode->i_state & I_CLEAR); retry: if (atomic_dec_and_lock(&inode->i_count, &inode->i_lock)) { if (inode->i_nlink && (inode->i_state & I_DIRTY_TIME)) { atomic_inc(&inode->i_count); |
0ae45f63d vfs: add support ... |
1542 1543 1544 1545 1546 1547 |
spin_unlock(&inode->i_lock); trace_writeback_lazytime_iput(inode); mark_inode_dirty_sync(inode); goto retry; } iput_final(inode); |
1da177e4c Linux-2.6.12-rc2 |
1548 1549 |
} } |
1da177e4c Linux-2.6.12-rc2 |
1550 1551 1552 1553 1554 1555 1556 1557 1558 1559 |
EXPORT_SYMBOL(iput); /** * bmap - find a block number in a file * @inode: inode of file * @block: block to find * * Returns the block number on the device holding the inode that * is the disk block number for the block of the file requested. * That is, asked for block 4 of inode 1 the function will return the |
6b3304b53 Make checkpatch.p... |
1560 |
* disk block relative to the disk start that holds that block of the |
1da177e4c Linux-2.6.12-rc2 |
1561 1562 |
* file. */ |
6b3304b53 Make checkpatch.p... |
1563 |
sector_t bmap(struct inode *inode, sector_t block) |
1da177e4c Linux-2.6.12-rc2 |
1564 1565 1566 1567 1568 1569 |
{ sector_t res = 0; if (inode->i_mapping->a_ops->bmap) res = inode->i_mapping->a_ops->bmap(inode->i_mapping, block); return res; } |
1da177e4c Linux-2.6.12-rc2 |
1570 |
EXPORT_SYMBOL(bmap); |
11ff6f05f Allow relatime to... |
1571 1572 1573 1574 1575 |
/* * With relative atime, only update atime if the previous atime is * earlier than either the ctime or mtime or if at least a day has * passed since the last atime update. */ |
c67185434 Revert "vfs: upda... |
1576 |
static int relatime_need_update(struct vfsmount *mnt, struct inode *inode, |
6f22b6649 fs: use timespec6... |
1577 |
struct timespec64 now) |
11ff6f05f Allow relatime to... |
1578 |
{ |
c67185434 Revert "vfs: upda... |
1579 |
if (!(mnt->mnt_flags & MNT_RELATIME)) |
11ff6f05f Allow relatime to... |
1580 1581 1582 1583 |
return 1; /* * Is mtime younger than atime? If yes, update atime: */ |
95582b008 vfs: change inode... |
1584 |
if (timespec64_compare(&inode->i_mtime, &inode->i_atime) >= 0) |
11ff6f05f Allow relatime to... |
1585 1586 1587 1588 |
return 1; /* * Is ctime younger than atime? If yes, update atime: */ |
95582b008 vfs: change inode... |
1589 |
if (timespec64_compare(&inode->i_ctime, &inode->i_atime) >= 0) |
11ff6f05f Allow relatime to... |
1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 |
return 1; /* * Is the previous atime value older than a day? If yes, * update atime: */ if ((long)(now.tv_sec - inode->i_atime.tv_sec) >= 24*60*60) return 1; /* * Good, we can skip the atime update: */ return 0; } |
95582b008 vfs: change inode... |
1603 |
int generic_update_time(struct inode *inode, struct timespec64 *time, int flags) |
c3b2da314 fs: introduce ino... |
1604 |
{ |
0ae45f63d vfs: add support ... |
1605 |
int iflags = I_DIRTY_TIME; |
e38cf302b fs: only set S_VE... |
1606 |
bool dirty = false; |
c3b2da314 fs: introduce ino... |
1607 1608 1609 1610 |
if (flags & S_ATIME) inode->i_atime = *time; if (flags & S_VERSION) |
e38cf302b fs: only set S_VE... |
1611 |
dirty = inode_maybe_inc_iversion(inode, false); |
c3b2da314 fs: introduce ino... |
1612 1613 1614 1615 |
if (flags & S_CTIME) inode->i_ctime = *time; if (flags & S_MTIME) inode->i_mtime = *time; |
e38cf302b fs: only set S_VE... |
1616 1617 1618 |
if ((flags & (S_ATIME | S_CTIME | S_MTIME)) && !(inode->i_sb->s_flags & SB_LAZYTIME)) dirty = true; |
0ae45f63d vfs: add support ... |
1619 |
|
e38cf302b fs: only set S_VE... |
1620 |
if (dirty) |
0ae45f63d vfs: add support ... |
1621 1622 |
iflags |= I_DIRTY_SYNC; __mark_inode_dirty(inode, iflags); |
c3b2da314 fs: introduce ino... |
1623 1624 |
return 0; } |
0ae45f63d vfs: add support ... |
1625 1626 1627 1628 1629 1630 |
EXPORT_SYMBOL(generic_update_time); /* * This does the actual work of updating an inodes time or version. Must have * had called mnt_want_write() before calling this. */ |
95582b008 vfs: change inode... |
1631 |
static int update_time(struct inode *inode, struct timespec64 *time, int flags) |
0ae45f63d vfs: add support ... |
1632 |
{ |
95582b008 vfs: change inode... |
1633 |
int (*update_time)(struct inode *, struct timespec64 *, int); |
0ae45f63d vfs: add support ... |
1634 1635 1636 1637 1638 1639 |
update_time = inode->i_op->update_time ? inode->i_op->update_time : generic_update_time; return update_time(inode, time, flags); } |
c3b2da314 fs: introduce ino... |
1640 |
|
1da177e4c Linux-2.6.12-rc2 |
1641 |
/** |
869243a0f [PATCH] remove up... |
1642 |
* touch_atime - update the access time |
185553b22 fs: fix inode.c k... |
1643 |
* @path: the &struct path to update |
30fdc8ee0 fs/inode.c: fix k... |
1644 |
* @inode: inode to update |
1da177e4c Linux-2.6.12-rc2 |
1645 1646 1647 1648 1649 |
* * Update the accessed time on an inode and mark it for writeback. * This function automatically handles read only file systems and media, * as well as the "noatime" flag and inode specific "noatime" markers. */ |
c67185434 Revert "vfs: upda... |
1650 |
bool atime_needs_update(const struct path *path, struct inode *inode) |
1da177e4c Linux-2.6.12-rc2 |
1651 |
{ |
68ac1234f switch touch_atim... |
1652 |
struct vfsmount *mnt = path->mnt; |
95582b008 vfs: change inode... |
1653 |
struct timespec64 now; |
1da177e4c Linux-2.6.12-rc2 |
1654 |
|
cdb70f3f7 [PATCH] r/o bind ... |
1655 |
if (inode->i_flags & S_NOATIME) |
8fa9dd246 VFS/namei: make t... |
1656 |
return false; |
0bd23d09b vfs: Don't modify... |
1657 1658 1659 1660 1661 1662 |
/* Atime updates will likely cause i_uid and i_gid to be written * back improprely if their true value is unknown to the vfs. */ if (HAS_UNMAPPED_ID(inode)) return false; |
37756ced1 [PATCH] avoid one... |
1663 |
if (IS_NOATIME(inode)) |
8fa9dd246 VFS/namei: make t... |
1664 |
return false; |
1751e8a6c Rename superblock... |
1665 |
if ((inode->i_sb->s_flags & SB_NODIRATIME) && S_ISDIR(inode->i_mode)) |
8fa9dd246 VFS/namei: make t... |
1666 |
return false; |
47ae32d6a [PATCH] relative ... |
1667 |
|
cdb70f3f7 [PATCH] r/o bind ... |
1668 |
if (mnt->mnt_flags & MNT_NOATIME) |
8fa9dd246 VFS/namei: make t... |
1669 |
return false; |
cdb70f3f7 [PATCH] r/o bind ... |
1670 |
if ((mnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)) |
8fa9dd246 VFS/namei: make t... |
1671 |
return false; |
1da177e4c Linux-2.6.12-rc2 |
1672 |
|
c2050a454 fs: Replace curre... |
1673 |
now = current_time(inode); |
11ff6f05f Allow relatime to... |
1674 |
|
6f22b6649 fs: use timespec6... |
1675 |
if (!relatime_need_update(mnt, inode, now)) |
8fa9dd246 VFS/namei: make t... |
1676 |
return false; |
11ff6f05f Allow relatime to... |
1677 |
|
95582b008 vfs: change inode... |
1678 |
if (timespec64_equal(&inode->i_atime, &now)) |
8fa9dd246 VFS/namei: make t... |
1679 1680 1681 1682 1683 1684 1685 1686 1687 |
return false; return true; } void touch_atime(const struct path *path) { struct vfsmount *mnt = path->mnt; struct inode *inode = d_inode(path->dentry); |
95582b008 vfs: change inode... |
1688 |
struct timespec64 now; |
8fa9dd246 VFS/namei: make t... |
1689 |
|
c67185434 Revert "vfs: upda... |
1690 |
if (!atime_needs_update(path, inode)) |
b12536c27 vfs: optimization... |
1691 |
return; |
5d37e9e6d fs: Skip atime up... |
1692 |
if (!sb_start_write_trylock(inode->i_sb)) |
b12536c27 vfs: optimization... |
1693 |
return; |
47ae32d6a [PATCH] relative ... |
1694 |
|
8fa9dd246 VFS/namei: make t... |
1695 |
if (__mnt_want_write(mnt) != 0) |
5d37e9e6d fs: Skip atime up... |
1696 |
goto skip_update; |
c3b2da314 fs: introduce ino... |
1697 1698 1699 1700 1701 1702 |
/* * File systems can error out when updating inodes if they need to * allocate new space to modify an inode (such is the case for * Btrfs), but since we touch atime while walking down the path we * really don't care if we failed to update the atime of the file, * so just ignore the return value. |
2bc556528 Btrfs: don't upda... |
1703 1704 |
* We may also fail on filesystems that have the ability to make parts * of the fs read only, e.g. subvolumes in Btrfs. |
c3b2da314 fs: introduce ino... |
1705 |
*/ |
c2050a454 fs: Replace curre... |
1706 |
now = current_time(inode); |
c3b2da314 fs: introduce ino... |
1707 |
update_time(inode, &now, S_ATIME); |
5d37e9e6d fs: Skip atime up... |
1708 1709 1710 |
__mnt_drop_write(mnt); skip_update: sb_end_write(inode->i_sb); |
1da177e4c Linux-2.6.12-rc2 |
1711 |
} |
869243a0f [PATCH] remove up... |
1712 |
EXPORT_SYMBOL(touch_atime); |
1da177e4c Linux-2.6.12-rc2 |
1713 |
|
3ed37648e fs: move file_rem... |
1714 1715 1716 1717 1718 1719 1720 1721 |
/* * The logic we want is * * if suid or (sgid and xgrp) * remove privs */ int should_remove_suid(struct dentry *dentry) { |
df2b1afde VFS: fs/inode.c h... |
1722 |
umode_t mode = d_inode(dentry)->i_mode; |
3ed37648e fs: move file_rem... |
1723 1724 1725 1726 1727 1728 1729 1730 1731 1732 1733 1734 1735 1736 1737 1738 1739 1740 1741 |
int kill = 0; /* suid always must be killed */ if (unlikely(mode & S_ISUID)) kill = ATTR_KILL_SUID; /* * sgid without any exec bits is just a mandatory locking mark; leave * it alone. If some exec bits are set, it's a real sgid; kill it. */ if (unlikely((mode & S_ISGID) && (mode & S_IXGRP))) kill |= ATTR_KILL_SGID; if (unlikely(kill && !capable(CAP_FSETID) && S_ISREG(mode))) return kill; return 0; } EXPORT_SYMBOL(should_remove_suid); |
dbfae0cdc fs: Provide funct... |
1742 1743 1744 1745 1746 |
/* * Return mask of changes for notify_change() that need to be done as a * response to write or truncate. Return 0 if nothing has to be changed. * Negative value on error (change should be denied). */ |
45f147a1b fs: Call security... |
1747 |
int dentry_needs_remove_privs(struct dentry *dentry) |
dbfae0cdc fs: Provide funct... |
1748 |
{ |
dbfae0cdc fs: Provide funct... |
1749 1750 1751 1752 1753 1754 1755 1756 1757 1758 1759 1760 1761 1762 1763 |
struct inode *inode = d_inode(dentry); int mask = 0; int ret; if (IS_NOSEC(inode)) return 0; mask = should_remove_suid(dentry); ret = security_inode_need_killpriv(dentry); if (ret < 0) return ret; if (ret) mask |= ATTR_KILL_PRIV; return mask; } |
dbfae0cdc fs: Provide funct... |
1764 1765 |
static int __remove_privs(struct dentry *dentry, int kill) |
3ed37648e fs: move file_rem... |
1766 1767 1768 1769 |
{ struct iattr newattrs; newattrs.ia_valid = ATTR_FORCE | kill; |
27ac0ffea locks: break dele... |
1770 1771 1772 1773 1774 |
/* * Note we call this on write, so notify_change will not * encounter any conflicting delegations: */ return notify_change(dentry, &newattrs, NULL); |
3ed37648e fs: move file_rem... |
1775 |
} |
5fa8e0a1c fs: Rename file_r... |
1776 1777 1778 1779 1780 |
/* * Remove special file priviledges (suid, capabilities) when file is written * to or truncated. */ int file_remove_privs(struct file *file) |
3ed37648e fs: move file_rem... |
1781 |
{ |
c1892c377 vfs: fix deadlock... |
1782 1783 |
struct dentry *dentry = file_dentry(file); struct inode *inode = file_inode(file); |
dbfae0cdc fs: Provide funct... |
1784 |
int kill; |
3ed37648e fs: move file_rem... |
1785 |
int error = 0; |
f69e749a4 Abort file_remove... |
1786 1787 1788 1789 1790 1791 1792 |
/* * Fast path for nothing security related. * As well for non-regular files, e.g. blkdev inodes. * For example, blkdev_write_iter() might get here * trying to remove privs which it is not allowed to. */ if (IS_NOSEC(inode) || !S_ISREG(inode->i_mode)) |
3ed37648e fs: move file_rem... |
1793 |
return 0; |
c1892c377 vfs: fix deadlock... |
1794 |
kill = dentry_needs_remove_privs(dentry); |
dbfae0cdc fs: Provide funct... |
1795 1796 1797 1798 |
if (kill < 0) return kill; if (kill) error = __remove_privs(dentry, kill); |
2426f3910 fs: Fix S_NOSEC h... |
1799 1800 |
if (!error) inode_has_no_xattr(inode); |
3ed37648e fs: move file_rem... |
1801 1802 1803 |
return error; } |
5fa8e0a1c fs: Rename file_r... |
1804 |
EXPORT_SYMBOL(file_remove_privs); |
3ed37648e fs: move file_rem... |
1805 |
|
1da177e4c Linux-2.6.12-rc2 |
1806 |
/** |
870f48179 [PATCH] replace i... |
1807 1808 |
* file_update_time - update mtime and ctime time * @file: file accessed |
1da177e4c Linux-2.6.12-rc2 |
1809 |
* |
870f48179 [PATCH] replace i... |
1810 1811 1812 1813 |
* Update the mtime and ctime members of an inode and mark the inode * for writeback. Note that this function is meant exclusively for * usage in the file write path of filesystems, and filesystems may * choose to explicitly ignore update via this function with the |
2eadfc0ed trivial: fs/inode... |
1814 |
* S_NOCMTIME inode flag, e.g. for network filesystem where these |
c3b2da314 fs: introduce ino... |
1815 1816 |
* timestamps are handled by the server. This can return an error for * file systems who need to allocate space in order to update an inode. |
1da177e4c Linux-2.6.12-rc2 |
1817 |
*/ |
c3b2da314 fs: introduce ino... |
1818 |
int file_update_time(struct file *file) |
1da177e4c Linux-2.6.12-rc2 |
1819 |
{ |
496ad9aa8 new helper: file_... |
1820 |
struct inode *inode = file_inode(file); |
95582b008 vfs: change inode... |
1821 |
struct timespec64 now; |
c3b2da314 fs: introduce ino... |
1822 1823 |
int sync_it = 0; int ret; |
1da177e4c Linux-2.6.12-rc2 |
1824 |
|
ce06e0b21 vfs: optimize tou... |
1825 |
/* First try to exhaust all avenues to not sync */ |
1da177e4c Linux-2.6.12-rc2 |
1826 |
if (IS_NOCMTIME(inode)) |
c3b2da314 fs: introduce ino... |
1827 |
return 0; |
20ddee2c7 [PATCH] r/o bind ... |
1828 |
|
c2050a454 fs: Replace curre... |
1829 |
now = current_time(inode); |
95582b008 vfs: change inode... |
1830 |
if (!timespec64_equal(&inode->i_mtime, &now)) |
ce06e0b21 vfs: optimize tou... |
1831 |
sync_it = S_MTIME; |
1da177e4c Linux-2.6.12-rc2 |
1832 |
|
95582b008 vfs: change inode... |
1833 |
if (!timespec64_equal(&inode->i_ctime, &now)) |
ce06e0b21 vfs: optimize tou... |
1834 |
sync_it |= S_CTIME; |
870f48179 [PATCH] replace i... |
1835 |
|
e38cf302b fs: only set S_VE... |
1836 |
if (IS_I_VERSION(inode) && inode_iversion_need_inc(inode)) |
ce06e0b21 vfs: optimize tou... |
1837 |
sync_it |= S_VERSION; |
7a224228e vfs: Add 64 bit i... |
1838 |
|
ce06e0b21 vfs: optimize tou... |
1839 |
if (!sync_it) |
c3b2da314 fs: introduce ino... |
1840 |
return 0; |
ce06e0b21 vfs: optimize tou... |
1841 1842 |
/* Finally allowed to write? Takes lock. */ |
eb04c2828 fs: Add freezing ... |
1843 |
if (__mnt_want_write_file(file)) |
c3b2da314 fs: introduce ino... |
1844 |
return 0; |
ce06e0b21 vfs: optimize tou... |
1845 |
|
c3b2da314 fs: introduce ino... |
1846 |
ret = update_time(inode, &now, sync_it); |
eb04c2828 fs: Add freezing ... |
1847 |
__mnt_drop_write_file(file); |
c3b2da314 fs: introduce ino... |
1848 1849 |
return ret; |
1da177e4c Linux-2.6.12-rc2 |
1850 |
} |
870f48179 [PATCH] replace i... |
1851 |
EXPORT_SYMBOL(file_update_time); |
1da177e4c Linux-2.6.12-rc2 |
1852 |
|
e38f7f53c vfs: introduce fi... |
1853 1854 1855 1856 1857 1858 1859 1860 1861 1862 1863 1864 1865 1866 1867 1868 1869 1870 1871 |
/* Caller must hold the file's inode lock */ int file_modified(struct file *file) { int err; /* * Clear the security bits if the process is not being run by root. * This keeps people from modifying setuid and setgid binaries. */ err = file_remove_privs(file); if (err) return err; if (unlikely(file->f_mode & FMODE_NOCMTIME)) return 0; return file_update_time(file); } EXPORT_SYMBOL(file_modified); |
1da177e4c Linux-2.6.12-rc2 |
1872 1873 1874 1875 1876 1877 1878 1879 |
int inode_needs_sync(struct inode *inode) { if (IS_SYNC(inode)) return 1; if (S_ISDIR(inode->i_mode) && IS_DIRSYNC(inode)) return 1; return 0; } |
1da177e4c Linux-2.6.12-rc2 |
1880 |
EXPORT_SYMBOL(inode_needs_sync); |
1da177e4c Linux-2.6.12-rc2 |
1881 |
/* |
168a9fd6a [PATCH] __wait_on... |
1882 1883 1884 1885 1886 1887 |
* If we try to find an inode in the inode hash while it is being * deleted, we have to wait until the filesystem completes its * deletion before reporting that it isn't found. This function waits * until the deletion _might_ have completed. Callers are responsible * to recheck inode state. * |
eaff8079d kill I_LOCK |
1888 |
* It doesn't matter if I_NEW is not set initially, a call to |
250df6ed2 fs: protect inode... |
1889 1890 |
* wake_up_bit(&inode->i_state, __I_NEW) after removing from the hash list * will DTRT. |
1da177e4c Linux-2.6.12-rc2 |
1891 1892 1893 1894 |
*/ static void __wait_on_freeing_inode(struct inode *inode) { wait_queue_head_t *wq; |
eaff8079d kill I_LOCK |
1895 1896 |
DEFINE_WAIT_BIT(wait, &inode->i_state, __I_NEW); wq = bit_waitqueue(&inode->i_state, __I_NEW); |
214171361 sched/wait: Stand... |
1897 |
prepare_to_wait(wq, &wait.wq_entry, TASK_UNINTERRUPTIBLE); |
250df6ed2 fs: protect inode... |
1898 |
spin_unlock(&inode->i_lock); |
67a23c494 fs: rename inode_... |
1899 |
spin_unlock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
1900 |
schedule(); |
214171361 sched/wait: Stand... |
1901 |
finish_wait(wq, &wait.wq_entry); |
67a23c494 fs: rename inode_... |
1902 |
spin_lock(&inode_hash_lock); |
1da177e4c Linux-2.6.12-rc2 |
1903 |
} |
1da177e4c Linux-2.6.12-rc2 |
1904 1905 1906 1907 1908 1909 1910 1911 1912 1913 1914 1915 1916 1917 1918 |
static __initdata unsigned long ihash_entries; static int __init set_ihash_entries(char *str) { if (!str) return 0; ihash_entries = simple_strtoul(str, &str, 0); return 1; } __setup("ihash_entries=", set_ihash_entries); /* * Initialize the waitqueues and inode hash table. */ void __init inode_init_early(void) { |
1da177e4c Linux-2.6.12-rc2 |
1919 1920 1921 1922 1923 1924 1925 1926 1927 1928 1929 |
/* If hashes are distributed across NUMA nodes, defer * hash allocation until vmalloc space is available. */ if (hashdist) return; inode_hashtable = alloc_large_system_hash("Inode-cache", sizeof(struct hlist_head), ihash_entries, 14, |
3d375d785 mm: update caller... |
1930 |
HASH_EARLY | HASH_ZERO, |
1da177e4c Linux-2.6.12-rc2 |
1931 1932 |
&i_hash_shift, &i_hash_mask, |
31fe62b95 mm: add a low lim... |
1933 |
0, |
1da177e4c Linux-2.6.12-rc2 |
1934 |
0); |
1da177e4c Linux-2.6.12-rc2 |
1935 |
} |
74bf17cff fs: remove the un... |
1936 |
void __init inode_init(void) |
1da177e4c Linux-2.6.12-rc2 |
1937 |
{ |
1da177e4c Linux-2.6.12-rc2 |
1938 |
/* inode slab cache */ |
b0196009d [PATCH] cpuset me... |
1939 1940 1941 1942 |
inode_cachep = kmem_cache_create("inode_cache", sizeof(struct inode), 0, (SLAB_RECLAIM_ACCOUNT|SLAB_PANIC| |
5d097056c kmemcg: account c... |
1943 |
SLAB_MEM_SPREAD|SLAB_ACCOUNT), |
20c2df83d mm: Remove slab d... |
1944 |
init_once); |
1da177e4c Linux-2.6.12-rc2 |
1945 1946 1947 1948 1949 1950 1951 1952 1953 1954 |
/* Hash may have been set up in inode_init_early */ if (!hashdist) return; inode_hashtable = alloc_large_system_hash("Inode-cache", sizeof(struct hlist_head), ihash_entries, 14, |
3d375d785 mm: update caller... |
1955 |
HASH_ZERO, |
1da177e4c Linux-2.6.12-rc2 |
1956 1957 |
&i_hash_shift, &i_hash_mask, |
31fe62b95 mm: add a low lim... |
1958 |
0, |
1da177e4c Linux-2.6.12-rc2 |
1959 |
0); |
1da177e4c Linux-2.6.12-rc2 |
1960 1961 1962 1963 1964 1965 1966 1967 1968 1969 1970 1971 |
} void init_special_inode(struct inode *inode, umode_t mode, dev_t rdev) { inode->i_mode = mode; if (S_ISCHR(mode)) { inode->i_fop = &def_chr_fops; inode->i_rdev = rdev; } else if (S_ISBLK(mode)) { inode->i_fop = &def_blk_fops; inode->i_rdev = rdev; } else if (S_ISFIFO(mode)) |
599a0ac14 pipe: fold file_o... |
1972 |
inode->i_fop = &pipefifo_fops; |
1da177e4c Linux-2.6.12-rc2 |
1973 |
else if (S_ISSOCK(mode)) |
bd9b51e79 make default ->i_... |
1974 |
; /* leave it no_open_fops */ |
1da177e4c Linux-2.6.12-rc2 |
1975 |
else |
af0d9ae81 fs/inode.c: add d... |
1976 1977 1978 1979 |
printk(KERN_DEBUG "init_special_inode: bogus i_mode (%o) for" " inode %s:%lu ", mode, inode->i_sb->s_id, inode->i_ino); |
1da177e4c Linux-2.6.12-rc2 |
1980 1981 |
} EXPORT_SYMBOL(init_special_inode); |
a1bd120d1 vfs: Add inode ui... |
1982 1983 |
/** |
eaae668d0 fs/inode: Fix ker... |
1984 |
* inode_init_owner - Init uid,gid,mode for new inode according to posix standards |
a1bd120d1 vfs: Add inode ui... |
1985 1986 1987 1988 1989 |
* @inode: New inode * @dir: Directory inode * @mode: mode of the new inode */ void inode_init_owner(struct inode *inode, const struct inode *dir, |
62bb10917 switch inode_init... |
1990 |
umode_t mode) |
a1bd120d1 vfs: Add inode ui... |
1991 1992 1993 1994 |
{ inode->i_uid = current_fsuid(); if (dir && dir->i_mode & S_ISGID) { inode->i_gid = dir->i_gid; |
0fa3ecd87 Fix up non-direct... |
1995 1996 |
/* Directories are special, and always inherit S_ISGID */ |
a1bd120d1 vfs: Add inode ui... |
1997 1998 |
if (S_ISDIR(mode)) mode |= S_ISGID; |
0fa3ecd87 Fix up non-direct... |
1999 2000 2001 2002 |
else if ((mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP) && !in_group_p(inode->i_gid) && !capable_wrt_inode_uidgid(dir, CAP_FSETID)) mode &= ~S_ISGID; |
a1bd120d1 vfs: Add inode ui... |
2003 2004 2005 2006 2007 |
} else inode->i_gid = current_fsgid(); inode->i_mode = mode; } EXPORT_SYMBOL(inode_init_owner); |
e795b7179 userns: userns: c... |
2008 |
|
2e1496707 userns: rename is... |
2009 2010 2011 2012 |
/** * inode_owner_or_capable - check current task permissions to inode * @inode: inode being checked * |
23adbe12e fs,userns: Change... |
2013 2014 |
* Return true if current either has CAP_FOWNER in a namespace with the * inode owner uid mapped, or owns the file. |
e795b7179 userns: userns: c... |
2015 |
*/ |
2e1496707 userns: rename is... |
2016 |
bool inode_owner_or_capable(const struct inode *inode) |
e795b7179 userns: userns: c... |
2017 |
{ |
23adbe12e fs,userns: Change... |
2018 |
struct user_namespace *ns; |
92361636e userns: Store uid... |
2019 |
if (uid_eq(current_fsuid(), inode->i_uid)) |
e795b7179 userns: userns: c... |
2020 |
return true; |
23adbe12e fs,userns: Change... |
2021 2022 |
ns = current_user_ns(); |
cc658db47 fs: Reorder inode... |
2023 |
if (kuid_has_mapping(ns, inode->i_uid) && ns_capable(ns, CAP_FOWNER)) |
e795b7179 userns: userns: c... |
2024 2025 2026 |
return true; return false; } |
2e1496707 userns: rename is... |
2027 |
EXPORT_SYMBOL(inode_owner_or_capable); |
1d59d61f6 NFS: Ensure that ... |
2028 2029 2030 2031 2032 2033 2034 2035 2036 2037 |
/* * Direct i/o helper functions */ static void __inode_dio_wait(struct inode *inode) { wait_queue_head_t *wq = bit_waitqueue(&inode->i_state, __I_DIO_WAKEUP); DEFINE_WAIT_BIT(q, &inode->i_state, __I_DIO_WAKEUP); do { |
214171361 sched/wait: Stand... |
2038 |
prepare_to_wait(wq, &q.wq_entry, TASK_UNINTERRUPTIBLE); |
1d59d61f6 NFS: Ensure that ... |
2039 2040 2041 |
if (atomic_read(&inode->i_dio_count)) schedule(); } while (atomic_read(&inode->i_dio_count)); |
214171361 sched/wait: Stand... |
2042 |
finish_wait(wq, &q.wq_entry); |
1d59d61f6 NFS: Ensure that ... |
2043 2044 2045 2046 2047 2048 2049 2050 2051 2052 2053 2054 2055 2056 2057 2058 2059 2060 2061 2062 |
} /** * inode_dio_wait - wait for outstanding DIO requests to finish * @inode: inode to wait for * * Waits for all pending direct I/O requests to finish so that we can * proceed with a truncate or equivalent operation. * * Must be called under a lock that serializes taking new references * to i_dio_count, usually by inode->i_mutex. */ void inode_dio_wait(struct inode *inode) { if (atomic_read(&inode->i_dio_count)) __inode_dio_wait(inode); } EXPORT_SYMBOL(inode_dio_wait); /* |
5f16f3225 ext4: atomically ... |
2063 2064 2065 2066 2067 2068 2069 |
* inode_set_flags - atomically set some inode flags * * Note: the caller should be holding i_mutex, or else be sure that * they have exclusive access to the inode structure (i.e., while the * inode is being instantiated). The reason for the cmpxchg() loop * --- which wouldn't be necessary if all code paths which modify * i_flags actually followed this rule, is that there is at least one |
5fa8e0a1c fs: Rename file_r... |
2070 2071 |
* code path which doesn't today so we use cmpxchg() out of an abundance * of caution. |
5f16f3225 ext4: atomically ... |
2072 2073 2074 2075 2076 2077 2078 2079 2080 |
* * In the long run, i_mutex is overkill, and we should probably look * at using the i_lock spinlock to protect i_flags, and then make sure * it is so documented in include/linux/fs.h and that all code follows * the locking convention!! */ void inode_set_flags(struct inode *inode, unsigned int flags, unsigned int mask) { |
5f16f3225 ext4: atomically ... |
2081 |
WARN_ON_ONCE(flags & ~mask); |
a905737fd fs/inode.c: inode... |
2082 |
set_mask_bits(&inode->i_flags, mask, flags); |
5f16f3225 ext4: atomically ... |
2083 2084 |
} EXPORT_SYMBOL(inode_set_flags); |
21fc61c73 don't put symlink... |
2085 2086 2087 2088 2089 2090 |
void inode_nohighmem(struct inode *inode) { mapping_set_gfp_mask(inode->i_mapping, GFP_USER); } EXPORT_SYMBOL(inode_nohighmem); |
3cd886666 vfs: Add current_... |
2091 2092 |
/** |
8efd6894f fs: add timespec6... |
2093 2094 2095 2096 2097 2098 2099 2100 2101 2102 2103 2104 2105 2106 2107 2108 2109 2110 2111 2112 2113 2114 2115 2116 |
* timespec64_trunc - Truncate timespec64 to a granularity * @t: Timespec64 * @gran: Granularity in ns. * * Truncate a timespec64 to a granularity. Always rounds down. gran must * not be 0 nor greater than a second (NSEC_PER_SEC, or 10^9 ns). */ struct timespec64 timespec64_trunc(struct timespec64 t, unsigned gran) { /* Avoid division in the common cases 1 ns and 1 s. */ if (gran == 1) { /* nothing */ } else if (gran == NSEC_PER_SEC) { t.tv_nsec = 0; } else if (gran > 1 && gran < NSEC_PER_SEC) { t.tv_nsec -= t.tv_nsec % gran; } else { WARN(1, "illegal file time granularity: %u", gran); } return t; } EXPORT_SYMBOL(timespec64_trunc); /** |
50e17c000 vfs: Add timestam... |
2117 2118 2119 2120 2121 2122 2123 2124 2125 2126 2127 2128 2129 2130 2131 2132 2133 2134 2135 2136 2137 2138 2139 2140 2141 2142 2143 2144 2145 2146 2147 |
* timestamp_truncate - Truncate timespec to a granularity * @t: Timespec * @inode: inode being updated * * Truncate a timespec to the granularity supported by the fs * containing the inode. Always rounds down. gran must * not be 0 nor greater than a second (NSEC_PER_SEC, or 10^9 ns). */ struct timespec64 timestamp_truncate(struct timespec64 t, struct inode *inode) { struct super_block *sb = inode->i_sb; unsigned int gran = sb->s_time_gran; t.tv_sec = clamp(t.tv_sec, sb->s_time_min, sb->s_time_max); if (unlikely(t.tv_sec == sb->s_time_max || t.tv_sec == sb->s_time_min)) t.tv_nsec = 0; /* Avoid division in the common cases 1 ns and 1 s. */ if (gran == 1) ; /* nothing */ else if (gran == NSEC_PER_SEC) t.tv_nsec = 0; else if (gran > 1 && gran < NSEC_PER_SEC) t.tv_nsec -= t.tv_nsec % gran; else WARN(1, "invalid file time granularity: %u", gran); return t; } EXPORT_SYMBOL(timestamp_truncate); /** |
3cd886666 vfs: Add current_... |
2148 2149 2150 2151 2152 2153 2154 2155 2156 |
* current_time - Return FS time * @inode: inode. * * Return the current time truncated to the time granularity supported by * the fs. * * Note that inode and inode->sb cannot be NULL. * Otherwise, the function warns and returns time without truncation. */ |
95582b008 vfs: change inode... |
2157 |
struct timespec64 current_time(struct inode *inode) |
3cd886666 vfs: Add current_... |
2158 |
{ |
d651d1607 vfs: replace curr... |
2159 2160 2161 |
struct timespec64 now; ktime_get_coarse_real_ts64(&now); |
3cd886666 vfs: Add current_... |
2162 2163 2164 2165 2166 |
if (unlikely(!inode->i_sb)) { WARN(1, "current_time() called with uninitialized super_block in the inode"); return now; } |
50e17c000 vfs: Add timestam... |
2167 |
return timestamp_truncate(now, inode); |
3cd886666 vfs: Add current_... |
2168 2169 |
} EXPORT_SYMBOL(current_time); |
5aca28421 vfs: create a gen... |
2170 2171 2172 2173 2174 2175 2176 2177 2178 2179 2180 2181 2182 2183 2184 2185 2186 2187 2188 2189 2190 2191 2192 2193 |
/* * Generic function to check FS_IOC_SETFLAGS values and reject any invalid * configurations. * * Note: the caller should be holding i_mutex, or else be sure that they have * exclusive access to the inode structure. */ int vfs_ioc_setflags_prepare(struct inode *inode, unsigned int oldflags, unsigned int flags) { /* * The IMMUTABLE and APPEND_ONLY flags can only be changed by * the relevant capability. * * This test looks nicer. Thanks to Pauline Middelink */ if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL) && !capable(CAP_LINUX_IMMUTABLE)) return -EPERM; return 0; } EXPORT_SYMBOL(vfs_ioc_setflags_prepare); |
7b0e492e6 vfs: create a gen... |
2194 2195 2196 2197 2198 2199 2200 2201 2202 2203 2204 2205 2206 2207 2208 2209 2210 2211 2212 |
/* * Generic function to check FS_IOC_FSSETXATTR values and reject any invalid * configurations. * * Note: the caller should be holding i_mutex, or else be sure that they have * exclusive access to the inode structure. */ int vfs_ioc_fssetxattr_check(struct inode *inode, const struct fsxattr *old_fa, struct fsxattr *fa) { /* * Can't modify an immutable/append-only file unless we have * appropriate permission. */ if ((old_fa->fsx_xflags ^ fa->fsx_xflags) & (FS_XFLAG_IMMUTABLE | FS_XFLAG_APPEND) && !capable(CAP_LINUX_IMMUTABLE)) return -EPERM; |
f991492ed vfs: teach vfs_io... |
2213 2214 2215 2216 2217 2218 2219 2220 2221 2222 2223 2224 |
/* * Project Quota ID state is only allowed to change from within the init * namespace. Enforce that restriction only if we are trying to change * the quota ID state. Everything else is allowed in user namespaces. */ if (current_user_ns() != &init_user_ns) { if (old_fa->fsx_projid != fa->fsx_projid) return -EINVAL; if ((old_fa->fsx_xflags ^ fa->fsx_xflags) & FS_XFLAG_PROJINHERIT) return -EINVAL; } |
ca29be753 vfs: teach vfs_io... |
2225 2226 2227 2228 2229 2230 2231 2232 2233 2234 2235 |
/* Check extent size hints. */ if ((fa->fsx_xflags & FS_XFLAG_EXTSIZE) && !S_ISREG(inode->i_mode)) return -EINVAL; if ((fa->fsx_xflags & FS_XFLAG_EXTSZINHERIT) && !S_ISDIR(inode->i_mode)) return -EINVAL; if ((fa->fsx_xflags & FS_XFLAG_COWEXTSIZE) && !S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode)) return -EINVAL; |
dbc77f31e vfs: only allow F... |
2236 2237 2238 2239 2240 2241 2242 |
/* * It is only valid to set the DAX flag on regular files and * directories on filesystems. */ if ((fa->fsx_xflags & FS_XFLAG_DAX) && !(S_ISREG(inode->i_mode) || S_ISDIR(inode->i_mode))) return -EINVAL; |
ca29be753 vfs: teach vfs_io... |
2243 2244 2245 2246 2247 |
/* Extent size hints of zero turn off the flags. */ if (fa->fsx_extsize == 0) fa->fsx_xflags &= ~(FS_XFLAG_EXTSIZE | FS_XFLAG_EXTSZINHERIT); if (fa->fsx_cowextsize == 0) fa->fsx_xflags &= ~FS_XFLAG_COWEXTSIZE; |
7b0e492e6 vfs: create a gen... |
2248 2249 2250 |
return 0; } EXPORT_SYMBOL(vfs_ioc_fssetxattr_check); |