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Commit | Line | Data |
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1da177e4 | 1 | /* |
7b718769 NS |
2 | * Copyright (c) 2000-2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
1da177e4 | 4 | * |
7b718769 NS |
5 | * This program is free software; you can redistribute it and/or |
6 | * modify it under the terms of the GNU General Public License as | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
8 | * | |
7b718769 NS |
9 | * This program is distributed in the hope that it would be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
1da177e4 | 13 | * |
7b718769 NS |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, write the Free Software Foundation, | |
16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1da177e4 | 17 | */ |
1da177e4 | 18 | #include "xfs.h" |
a844f451 | 19 | #include "xfs_fs.h" |
1da177e4 | 20 | #include "xfs_types.h" |
ef14f0c1 | 21 | #include "xfs_acl.h" |
a844f451 | 22 | #include "xfs_bit.h" |
1da177e4 | 23 | #include "xfs_log.h" |
a844f451 | 24 | #include "xfs_inum.h" |
1da177e4 LT |
25 | #include "xfs_trans.h" |
26 | #include "xfs_sb.h" | |
27 | #include "xfs_ag.h" | |
1da177e4 | 28 | #include "xfs_mount.h" |
1da177e4 | 29 | #include "xfs_bmap_btree.h" |
a844f451 | 30 | #include "xfs_alloc_btree.h" |
1da177e4 | 31 | #include "xfs_ialloc_btree.h" |
1da177e4 LT |
32 | #include "xfs_dinode.h" |
33 | #include "xfs_inode.h" | |
a844f451 NS |
34 | #include "xfs_btree.h" |
35 | #include "xfs_ialloc.h" | |
1da177e4 LT |
36 | #include "xfs_quota.h" |
37 | #include "xfs_utils.h" | |
783a2f65 DC |
38 | #include "xfs_trans_priv.h" |
39 | #include "xfs_inode_item.h" | |
24f211ba CH |
40 | #include "xfs_bmap.h" |
41 | #include "xfs_btree_trace.h" | |
0b1b213f | 42 | #include "xfs_trace.h" |
24f211ba CH |
43 | |
44 | ||
45 | /* | |
46 | * Allocate and initialise an xfs_inode. | |
47 | */ | |
48 | STATIC struct xfs_inode * | |
49 | xfs_inode_alloc( | |
50 | struct xfs_mount *mp, | |
51 | xfs_ino_t ino) | |
52 | { | |
53 | struct xfs_inode *ip; | |
54 | ||
55 | /* | |
56 | * if this didn't occur in transactions, we could use | |
57 | * KM_MAYFAIL and return NULL here on ENOMEM. Set the | |
58 | * code up to do this anyway. | |
59 | */ | |
60 | ip = kmem_zone_alloc(xfs_inode_zone, KM_SLEEP); | |
61 | if (!ip) | |
62 | return NULL; | |
54e34621 CH |
63 | if (inode_init_always(mp->m_super, VFS_I(ip))) { |
64 | kmem_zone_free(xfs_inode_zone, ip); | |
65 | return NULL; | |
66 | } | |
24f211ba CH |
67 | |
68 | ASSERT(atomic_read(&ip->i_iocount) == 0); | |
69 | ASSERT(atomic_read(&ip->i_pincount) == 0); | |
70 | ASSERT(!spin_is_locked(&ip->i_flags_lock)); | |
71 | ASSERT(completion_done(&ip->i_flush)); | |
033da48f CH |
72 | |
73 | mrlock_init(&ip->i_iolock, MRLOCK_BARRIER, "xfsio", ip->i_ino); | |
24f211ba | 74 | |
24f211ba CH |
75 | /* initialise the xfs inode */ |
76 | ip->i_ino = ino; | |
77 | ip->i_mount = mp; | |
78 | memset(&ip->i_imap, 0, sizeof(struct xfs_imap)); | |
79 | ip->i_afp = NULL; | |
80 | memset(&ip->i_df, 0, sizeof(xfs_ifork_t)); | |
81 | ip->i_flags = 0; | |
82 | ip->i_update_core = 0; | |
24f211ba CH |
83 | ip->i_delayed_blks = 0; |
84 | memset(&ip->i_d, 0, sizeof(xfs_icdinode_t)); | |
85 | ip->i_size = 0; | |
86 | ip->i_new_size = 0; | |
87 | ||
705db3fd | 88 | /* prevent anyone from using this yet */ |
eaff8079 | 89 | VFS_I(ip)->i_state = I_NEW; |
24f211ba CH |
90 | |
91 | return ip; | |
92 | } | |
1da177e4 | 93 | |
fa0d7e3d NP |
94 | STATIC void |
95 | xfs_inode_free_callback( | |
96 | struct rcu_head *head) | |
97 | { | |
98 | struct inode *inode = container_of(head, struct inode, i_rcu); | |
99 | struct xfs_inode *ip = XFS_I(inode); | |
100 | ||
101 | INIT_LIST_HEAD(&inode->i_dentry); | |
102 | kmem_zone_free(xfs_inode_zone, ip); | |
103 | } | |
104 | ||
2f11feab | 105 | void |
b36ec042 CH |
106 | xfs_inode_free( |
107 | struct xfs_inode *ip) | |
108 | { | |
109 | switch (ip->i_d.di_mode & S_IFMT) { | |
110 | case S_IFREG: | |
111 | case S_IFDIR: | |
112 | case S_IFLNK: | |
113 | xfs_idestroy_fork(ip, XFS_DATA_FORK); | |
114 | break; | |
115 | } | |
116 | ||
117 | if (ip->i_afp) | |
118 | xfs_idestroy_fork(ip, XFS_ATTR_FORK); | |
119 | ||
b36ec042 CH |
120 | if (ip->i_itemp) { |
121 | /* | |
122 | * Only if we are shutting down the fs will we see an | |
123 | * inode still in the AIL. If it is there, we should remove | |
124 | * it to prevent a use-after-free from occurring. | |
125 | */ | |
126 | xfs_log_item_t *lip = &ip->i_itemp->ili_item; | |
127 | struct xfs_ail *ailp = lip->li_ailp; | |
128 | ||
129 | ASSERT(((lip->li_flags & XFS_LI_IN_AIL) == 0) || | |
130 | XFS_FORCED_SHUTDOWN(ip->i_mount)); | |
131 | if (lip->li_flags & XFS_LI_IN_AIL) { | |
132 | spin_lock(&ailp->xa_lock); | |
133 | if (lip->li_flags & XFS_LI_IN_AIL) | |
134 | xfs_trans_ail_delete(ailp, lip); | |
135 | else | |
136 | spin_unlock(&ailp->xa_lock); | |
137 | } | |
138 | xfs_inode_item_destroy(ip); | |
139 | ip->i_itemp = NULL; | |
140 | } | |
141 | ||
142 | /* asserts to verify all state is correct here */ | |
143 | ASSERT(atomic_read(&ip->i_iocount) == 0); | |
144 | ASSERT(atomic_read(&ip->i_pincount) == 0); | |
145 | ASSERT(!spin_is_locked(&ip->i_flags_lock)); | |
146 | ASSERT(completion_done(&ip->i_flush)); | |
147 | ||
fa0d7e3d | 148 | call_rcu(&ip->i_vnode.i_rcu, xfs_inode_free_callback); |
b36ec042 CH |
149 | } |
150 | ||
1da177e4 | 151 | /* |
6441e549 | 152 | * Check the validity of the inode we just found it the cache |
1da177e4 | 153 | */ |
6441e549 DC |
154 | static int |
155 | xfs_iget_cache_hit( | |
6441e549 DC |
156 | struct xfs_perag *pag, |
157 | struct xfs_inode *ip, | |
158 | int flags, | |
159 | int lock_flags) __releases(pag->pag_ici_lock) | |
1da177e4 | 160 | { |
bc990f5c | 161 | struct inode *inode = VFS_I(ip); |
6441e549 | 162 | struct xfs_mount *mp = ip->i_mount; |
bc990f5c CH |
163 | int error; |
164 | ||
165 | spin_lock(&ip->i_flags_lock); | |
da353b0d | 166 | |
6441e549 | 167 | /* |
bc990f5c CH |
168 | * If we are racing with another cache hit that is currently |
169 | * instantiating this inode or currently recycling it out of | |
170 | * reclaimabe state, wait for the initialisation to complete | |
171 | * before continuing. | |
172 | * | |
173 | * XXX(hch): eventually we should do something equivalent to | |
174 | * wait_on_inode to wait for these flags to be cleared | |
175 | * instead of polling for it. | |
6441e549 | 176 | */ |
bc990f5c | 177 | if (ip->i_flags & (XFS_INEW|XFS_IRECLAIM)) { |
0b1b213f | 178 | trace_xfs_iget_skip(ip); |
6441e549 | 179 | XFS_STATS_INC(xs_ig_frecycle); |
bc990f5c | 180 | error = EAGAIN; |
6441e549 DC |
181 | goto out_error; |
182 | } | |
da353b0d | 183 | |
bc990f5c CH |
184 | /* |
185 | * If lookup is racing with unlink return an error immediately. | |
186 | */ | |
187 | if (ip->i_d.di_mode == 0 && !(flags & XFS_IGET_CREATE)) { | |
188 | error = ENOENT; | |
189 | goto out_error; | |
190 | } | |
bf904248 | 191 | |
bc990f5c CH |
192 | /* |
193 | * If IRECLAIMABLE is set, we've torn down the VFS inode already. | |
194 | * Need to carefully get it back into useable state. | |
195 | */ | |
196 | if (ip->i_flags & XFS_IRECLAIMABLE) { | |
0b1b213f | 197 | trace_xfs_iget_reclaim(ip); |
da353b0d | 198 | |
6441e549 | 199 | /* |
f1f724e4 CH |
200 | * We need to set XFS_IRECLAIM to prevent xfs_reclaim_inode |
201 | * from stomping over us while we recycle the inode. We can't | |
202 | * clear the radix tree reclaimable tag yet as it requires | |
203 | * pag_ici_lock to be held exclusive. | |
6441e549 | 204 | */ |
f1f724e4 | 205 | ip->i_flags |= XFS_IRECLAIM; |
bc990f5c CH |
206 | |
207 | spin_unlock(&ip->i_flags_lock); | |
208 | read_unlock(&pag->pag_ici_lock); | |
209 | ||
210 | error = -inode_init_always(mp->m_super, inode); | |
211 | if (error) { | |
212 | /* | |
213 | * Re-initializing the inode failed, and we are in deep | |
214 | * trouble. Try to re-add it to the reclaim list. | |
215 | */ | |
216 | read_lock(&pag->pag_ici_lock); | |
217 | spin_lock(&ip->i_flags_lock); | |
218 | ||
219 | ip->i_flags &= ~XFS_INEW; | |
220 | ip->i_flags |= XFS_IRECLAIMABLE; | |
221 | __xfs_inode_set_reclaim_tag(pag, ip); | |
d2e078c3 | 222 | trace_xfs_iget_reclaim_fail(ip); |
6441e549 | 223 | goto out_error; |
da353b0d | 224 | } |
f1f724e4 CH |
225 | |
226 | write_lock(&pag->pag_ici_lock); | |
227 | spin_lock(&ip->i_flags_lock); | |
228 | ip->i_flags &= ~(XFS_IRECLAIMABLE | XFS_IRECLAIM); | |
229 | ip->i_flags |= XFS_INEW; | |
230 | __xfs_inode_clear_reclaim_tag(mp, pag, ip); | |
eaff8079 | 231 | inode->i_state = I_NEW; |
f1f724e4 CH |
232 | spin_unlock(&ip->i_flags_lock); |
233 | write_unlock(&pag->pag_ici_lock); | |
bc990f5c | 234 | } else { |
bf904248 | 235 | /* If the VFS inode is being torn down, pause and try again. */ |
bc990f5c | 236 | if (!igrab(inode)) { |
d2e078c3 | 237 | trace_xfs_iget_skip(ip); |
bc990f5c CH |
238 | error = EAGAIN; |
239 | goto out_error; | |
240 | } | |
1da177e4 | 241 | |
bc990f5c CH |
242 | /* We've got a live one. */ |
243 | spin_unlock(&ip->i_flags_lock); | |
244 | read_unlock(&pag->pag_ici_lock); | |
d2e078c3 | 245 | trace_xfs_iget_hit(ip); |
6441e549 | 246 | } |
da353b0d | 247 | |
6441e549 DC |
248 | if (lock_flags != 0) |
249 | xfs_ilock(ip, lock_flags); | |
da353b0d | 250 | |
6441e549 | 251 | xfs_iflags_clear(ip, XFS_ISTALE); |
6441e549 | 252 | XFS_STATS_INC(xs_ig_found); |
0b1b213f | 253 | |
6441e549 | 254 | return 0; |
1da177e4 | 255 | |
6441e549 | 256 | out_error: |
bc990f5c | 257 | spin_unlock(&ip->i_flags_lock); |
da353b0d | 258 | read_unlock(&pag->pag_ici_lock); |
6441e549 DC |
259 | return error; |
260 | } | |
261 | ||
262 | ||
263 | static int | |
264 | xfs_iget_cache_miss( | |
265 | struct xfs_mount *mp, | |
266 | struct xfs_perag *pag, | |
267 | xfs_trans_t *tp, | |
268 | xfs_ino_t ino, | |
269 | struct xfs_inode **ipp, | |
6441e549 | 270 | int flags, |
0c3dc2b0 | 271 | int lock_flags) |
6441e549 DC |
272 | { |
273 | struct xfs_inode *ip; | |
274 | int error; | |
6441e549 | 275 | xfs_agino_t agino = XFS_INO_TO_AGINO(mp, ino); |
1da177e4 | 276 | |
24f211ba CH |
277 | ip = xfs_inode_alloc(mp, ino); |
278 | if (!ip) | |
279 | return ENOMEM; | |
280 | ||
7b6259e7 | 281 | error = xfs_iread(mp, tp, ip, flags); |
6441e549 | 282 | if (error) |
24f211ba | 283 | goto out_destroy; |
1da177e4 | 284 | |
d2e078c3 | 285 | trace_xfs_iget_miss(ip); |
1da177e4 | 286 | |
745b1f47 | 287 | if ((ip->i_d.di_mode == 0) && !(flags & XFS_IGET_CREATE)) { |
6441e549 DC |
288 | error = ENOENT; |
289 | goto out_destroy; | |
1da177e4 LT |
290 | } |
291 | ||
292 | /* | |
bad55843 | 293 | * Preload the radix tree so we can insert safely under the |
56e73ec4 DC |
294 | * write spinlock. Note that we cannot sleep inside the preload |
295 | * region. | |
1da177e4 | 296 | */ |
da353b0d | 297 | if (radix_tree_preload(GFP_KERNEL)) { |
6441e549 | 298 | error = EAGAIN; |
ed93ec39 CH |
299 | goto out_destroy; |
300 | } | |
301 | ||
302 | /* | |
303 | * Because the inode hasn't been added to the radix-tree yet it can't | |
304 | * be found by another thread, so we can do the non-sleeping lock here. | |
305 | */ | |
306 | if (lock_flags) { | |
307 | if (!xfs_ilock_nowait(ip, lock_flags)) | |
308 | BUG(); | |
da353b0d | 309 | } |
f338f903 | 310 | |
da353b0d | 311 | write_lock(&pag->pag_ici_lock); |
6441e549 DC |
312 | |
313 | /* insert the new inode */ | |
da353b0d DC |
314 | error = radix_tree_insert(&pag->pag_ici_root, agino, ip); |
315 | if (unlikely(error)) { | |
6441e549 | 316 | WARN_ON(error != -EEXIST); |
da353b0d | 317 | XFS_STATS_INC(xs_ig_dup); |
6441e549 | 318 | error = EAGAIN; |
56e73ec4 | 319 | goto out_preload_end; |
1da177e4 LT |
320 | } |
321 | ||
6441e549 | 322 | /* These values _must_ be set before releasing the radix tree lock! */ |
1da177e4 | 323 | ip->i_udquot = ip->i_gdquot = NULL; |
7a18c386 | 324 | xfs_iflags_set(ip, XFS_INEW); |
1da177e4 | 325 | |
da353b0d DC |
326 | write_unlock(&pag->pag_ici_lock); |
327 | radix_tree_preload_end(); | |
0b1b213f | 328 | |
6441e549 DC |
329 | *ipp = ip; |
330 | return 0; | |
331 | ||
56e73ec4 | 332 | out_preload_end: |
6441e549 DC |
333 | write_unlock(&pag->pag_ici_lock); |
334 | radix_tree_preload_end(); | |
56e73ec4 DC |
335 | if (lock_flags) |
336 | xfs_iunlock(ip, lock_flags); | |
6441e549 | 337 | out_destroy: |
b36ec042 CH |
338 | __destroy_inode(VFS_I(ip)); |
339 | xfs_inode_free(ip); | |
6441e549 DC |
340 | return error; |
341 | } | |
342 | ||
343 | /* | |
344 | * Look up an inode by number in the given file system. | |
345 | * The inode is looked up in the cache held in each AG. | |
bf904248 DC |
346 | * If the inode is found in the cache, initialise the vfs inode |
347 | * if necessary. | |
6441e549 DC |
348 | * |
349 | * If it is not in core, read it in from the file system's device, | |
bf904248 | 350 | * add it to the cache and initialise the vfs inode. |
6441e549 DC |
351 | * |
352 | * The inode is locked according to the value of the lock_flags parameter. | |
353 | * This flag parameter indicates how and if the inode's IO lock and inode lock | |
354 | * should be taken. | |
355 | * | |
356 | * mp -- the mount point structure for the current file system. It points | |
357 | * to the inode hash table. | |
358 | * tp -- a pointer to the current transaction if there is one. This is | |
359 | * simply passed through to the xfs_iread() call. | |
360 | * ino -- the number of the inode desired. This is the unique identifier | |
361 | * within the file system for the inode being requested. | |
362 | * lock_flags -- flags indicating how to lock the inode. See the comment | |
363 | * for xfs_ilock() for a list of valid values. | |
6441e549 | 364 | */ |
bf904248 DC |
365 | int |
366 | xfs_iget( | |
6441e549 DC |
367 | xfs_mount_t *mp, |
368 | xfs_trans_t *tp, | |
369 | xfs_ino_t ino, | |
370 | uint flags, | |
371 | uint lock_flags, | |
7b6259e7 | 372 | xfs_inode_t **ipp) |
6441e549 DC |
373 | { |
374 | xfs_inode_t *ip; | |
375 | int error; | |
376 | xfs_perag_t *pag; | |
377 | xfs_agino_t agino; | |
378 | ||
d276734d CH |
379 | /* reject inode numbers outside existing AGs */ |
380 | if (XFS_INO_TO_AGNO(mp, ino) >= mp->m_sb.sb_agcount) | |
6441e549 DC |
381 | return EINVAL; |
382 | ||
383 | /* get the perag structure and ensure that it's inode capable */ | |
5017e97d | 384 | pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, ino)); |
6441e549 DC |
385 | agino = XFS_INO_TO_AGINO(mp, ino); |
386 | ||
387 | again: | |
388 | error = 0; | |
389 | read_lock(&pag->pag_ici_lock); | |
390 | ip = radix_tree_lookup(&pag->pag_ici_root, agino); | |
391 | ||
392 | if (ip) { | |
bf904248 | 393 | error = xfs_iget_cache_hit(pag, ip, flags, lock_flags); |
6441e549 DC |
394 | if (error) |
395 | goto out_error_or_again; | |
396 | } else { | |
397 | read_unlock(&pag->pag_ici_lock); | |
398 | XFS_STATS_INC(xs_ig_missed); | |
399 | ||
7b6259e7 | 400 | error = xfs_iget_cache_miss(mp, pag, tp, ino, &ip, |
6441e549 DC |
401 | flags, lock_flags); |
402 | if (error) | |
403 | goto out_error_or_again; | |
404 | } | |
5017e97d | 405 | xfs_perag_put(pag); |
1da177e4 | 406 | |
1da177e4 LT |
407 | *ipp = ip; |
408 | ||
bf904248 DC |
409 | ASSERT(ip->i_df.if_ext_max == |
410 | XFS_IFORK_DSIZE(ip) / sizeof(xfs_bmbt_rec_t)); | |
1da177e4 LT |
411 | /* |
412 | * If we have a real type for an on-disk inode, we can set ops(&unlock) | |
413 | * now. If it's a new inode being created, xfs_ialloc will handle it. | |
414 | */ | |
bf904248 | 415 | if (xfs_iflags_test(ip, XFS_INEW) && ip->i_d.di_mode != 0) |
41be8bed | 416 | xfs_setup_inode(ip); |
1da177e4 | 417 | return 0; |
6441e549 DC |
418 | |
419 | out_error_or_again: | |
420 | if (error == EAGAIN) { | |
421 | delay(1); | |
422 | goto again; | |
423 | } | |
5017e97d | 424 | xfs_perag_put(pag); |
6441e549 | 425 | return error; |
1da177e4 LT |
426 | } |
427 | ||
1da177e4 LT |
428 | /* |
429 | * This is a wrapper routine around the xfs_ilock() routine | |
430 | * used to centralize some grungy code. It is used in places | |
431 | * that wish to lock the inode solely for reading the extents. | |
432 | * The reason these places can't just call xfs_ilock(SHARED) | |
433 | * is that the inode lock also guards to bringing in of the | |
434 | * extents from disk for a file in b-tree format. If the inode | |
435 | * is in b-tree format, then we need to lock the inode exclusively | |
436 | * until the extents are read in. Locking it exclusively all | |
437 | * the time would limit our parallelism unnecessarily, though. | |
438 | * What we do instead is check to see if the extents have been | |
439 | * read in yet, and only lock the inode exclusively if they | |
440 | * have not. | |
441 | * | |
442 | * The function returns a value which should be given to the | |
443 | * corresponding xfs_iunlock_map_shared(). This value is | |
444 | * the mode in which the lock was actually taken. | |
445 | */ | |
446 | uint | |
447 | xfs_ilock_map_shared( | |
448 | xfs_inode_t *ip) | |
449 | { | |
450 | uint lock_mode; | |
451 | ||
452 | if ((ip->i_d.di_format == XFS_DINODE_FMT_BTREE) && | |
453 | ((ip->i_df.if_flags & XFS_IFEXTENTS) == 0)) { | |
454 | lock_mode = XFS_ILOCK_EXCL; | |
455 | } else { | |
456 | lock_mode = XFS_ILOCK_SHARED; | |
457 | } | |
458 | ||
459 | xfs_ilock(ip, lock_mode); | |
460 | ||
461 | return lock_mode; | |
462 | } | |
463 | ||
464 | /* | |
465 | * This is simply the unlock routine to go with xfs_ilock_map_shared(). | |
466 | * All it does is call xfs_iunlock() with the given lock_mode. | |
467 | */ | |
468 | void | |
469 | xfs_iunlock_map_shared( | |
470 | xfs_inode_t *ip, | |
471 | unsigned int lock_mode) | |
472 | { | |
473 | xfs_iunlock(ip, lock_mode); | |
474 | } | |
475 | ||
476 | /* | |
477 | * The xfs inode contains 2 locks: a multi-reader lock called the | |
478 | * i_iolock and a multi-reader lock called the i_lock. This routine | |
479 | * allows either or both of the locks to be obtained. | |
480 | * | |
481 | * The 2 locks should always be ordered so that the IO lock is | |
482 | * obtained first in order to prevent deadlock. | |
483 | * | |
484 | * ip -- the inode being locked | |
485 | * lock_flags -- this parameter indicates the inode's locks | |
486 | * to be locked. It can be: | |
487 | * XFS_IOLOCK_SHARED, | |
488 | * XFS_IOLOCK_EXCL, | |
489 | * XFS_ILOCK_SHARED, | |
490 | * XFS_ILOCK_EXCL, | |
491 | * XFS_IOLOCK_SHARED | XFS_ILOCK_SHARED, | |
492 | * XFS_IOLOCK_SHARED | XFS_ILOCK_EXCL, | |
493 | * XFS_IOLOCK_EXCL | XFS_ILOCK_SHARED, | |
494 | * XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL | |
495 | */ | |
496 | void | |
579aa9ca CH |
497 | xfs_ilock( |
498 | xfs_inode_t *ip, | |
499 | uint lock_flags) | |
1da177e4 LT |
500 | { |
501 | /* | |
502 | * You can't set both SHARED and EXCL for the same lock, | |
503 | * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED, | |
504 | * and XFS_ILOCK_EXCL are valid values to set in lock_flags. | |
505 | */ | |
506 | ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) != | |
507 | (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)); | |
508 | ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) != | |
509 | (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)); | |
f7c66ce3 | 510 | ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_DEP_MASK)) == 0); |
1da177e4 | 511 | |
579aa9ca | 512 | if (lock_flags & XFS_IOLOCK_EXCL) |
f7c66ce3 | 513 | mrupdate_nested(&ip->i_iolock, XFS_IOLOCK_DEP(lock_flags)); |
579aa9ca | 514 | else if (lock_flags & XFS_IOLOCK_SHARED) |
f7c66ce3 | 515 | mraccess_nested(&ip->i_iolock, XFS_IOLOCK_DEP(lock_flags)); |
579aa9ca CH |
516 | |
517 | if (lock_flags & XFS_ILOCK_EXCL) | |
f7c66ce3 | 518 | mrupdate_nested(&ip->i_lock, XFS_ILOCK_DEP(lock_flags)); |
579aa9ca | 519 | else if (lock_flags & XFS_ILOCK_SHARED) |
f7c66ce3 | 520 | mraccess_nested(&ip->i_lock, XFS_ILOCK_DEP(lock_flags)); |
579aa9ca | 521 | |
0b1b213f | 522 | trace_xfs_ilock(ip, lock_flags, _RET_IP_); |
1da177e4 LT |
523 | } |
524 | ||
525 | /* | |
526 | * This is just like xfs_ilock(), except that the caller | |
527 | * is guaranteed not to sleep. It returns 1 if it gets | |
528 | * the requested locks and 0 otherwise. If the IO lock is | |
529 | * obtained but the inode lock cannot be, then the IO lock | |
530 | * is dropped before returning. | |
531 | * | |
532 | * ip -- the inode being locked | |
533 | * lock_flags -- this parameter indicates the inode's locks to be | |
534 | * to be locked. See the comment for xfs_ilock() for a list | |
535 | * of valid values. | |
1da177e4 LT |
536 | */ |
537 | int | |
579aa9ca CH |
538 | xfs_ilock_nowait( |
539 | xfs_inode_t *ip, | |
540 | uint lock_flags) | |
1da177e4 | 541 | { |
1da177e4 LT |
542 | /* |
543 | * You can't set both SHARED and EXCL for the same lock, | |
544 | * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED, | |
545 | * and XFS_ILOCK_EXCL are valid values to set in lock_flags. | |
546 | */ | |
547 | ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) != | |
548 | (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)); | |
549 | ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) != | |
550 | (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)); | |
f7c66ce3 | 551 | ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_DEP_MASK)) == 0); |
1da177e4 | 552 | |
1da177e4 | 553 | if (lock_flags & XFS_IOLOCK_EXCL) { |
579aa9ca CH |
554 | if (!mrtryupdate(&ip->i_iolock)) |
555 | goto out; | |
1da177e4 | 556 | } else if (lock_flags & XFS_IOLOCK_SHARED) { |
579aa9ca CH |
557 | if (!mrtryaccess(&ip->i_iolock)) |
558 | goto out; | |
1da177e4 LT |
559 | } |
560 | if (lock_flags & XFS_ILOCK_EXCL) { | |
579aa9ca CH |
561 | if (!mrtryupdate(&ip->i_lock)) |
562 | goto out_undo_iolock; | |
1da177e4 | 563 | } else if (lock_flags & XFS_ILOCK_SHARED) { |
579aa9ca CH |
564 | if (!mrtryaccess(&ip->i_lock)) |
565 | goto out_undo_iolock; | |
1da177e4 | 566 | } |
0b1b213f | 567 | trace_xfs_ilock_nowait(ip, lock_flags, _RET_IP_); |
1da177e4 | 568 | return 1; |
579aa9ca CH |
569 | |
570 | out_undo_iolock: | |
571 | if (lock_flags & XFS_IOLOCK_EXCL) | |
572 | mrunlock_excl(&ip->i_iolock); | |
573 | else if (lock_flags & XFS_IOLOCK_SHARED) | |
574 | mrunlock_shared(&ip->i_iolock); | |
575 | out: | |
576 | return 0; | |
1da177e4 LT |
577 | } |
578 | ||
579 | /* | |
580 | * xfs_iunlock() is used to drop the inode locks acquired with | |
581 | * xfs_ilock() and xfs_ilock_nowait(). The caller must pass | |
582 | * in the flags given to xfs_ilock() or xfs_ilock_nowait() so | |
583 | * that we know which locks to drop. | |
584 | * | |
585 | * ip -- the inode being unlocked | |
586 | * lock_flags -- this parameter indicates the inode's locks to be | |
587 | * to be unlocked. See the comment for xfs_ilock() for a list | |
588 | * of valid values for this parameter. | |
589 | * | |
590 | */ | |
591 | void | |
579aa9ca CH |
592 | xfs_iunlock( |
593 | xfs_inode_t *ip, | |
594 | uint lock_flags) | |
1da177e4 LT |
595 | { |
596 | /* | |
597 | * You can't set both SHARED and EXCL for the same lock, | |
598 | * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED, | |
599 | * and XFS_ILOCK_EXCL are valid values to set in lock_flags. | |
600 | */ | |
601 | ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) != | |
602 | (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)); | |
603 | ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) != | |
604 | (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)); | |
f7c66ce3 LM |
605 | ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_IUNLOCK_NONOTIFY | |
606 | XFS_LOCK_DEP_MASK)) == 0); | |
1da177e4 LT |
607 | ASSERT(lock_flags != 0); |
608 | ||
579aa9ca CH |
609 | if (lock_flags & XFS_IOLOCK_EXCL) |
610 | mrunlock_excl(&ip->i_iolock); | |
611 | else if (lock_flags & XFS_IOLOCK_SHARED) | |
612 | mrunlock_shared(&ip->i_iolock); | |
1da177e4 | 613 | |
579aa9ca CH |
614 | if (lock_flags & XFS_ILOCK_EXCL) |
615 | mrunlock_excl(&ip->i_lock); | |
616 | else if (lock_flags & XFS_ILOCK_SHARED) | |
617 | mrunlock_shared(&ip->i_lock); | |
1da177e4 | 618 | |
579aa9ca CH |
619 | if ((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) && |
620 | !(lock_flags & XFS_IUNLOCK_NONOTIFY) && ip->i_itemp) { | |
1da177e4 LT |
621 | /* |
622 | * Let the AIL know that this item has been unlocked in case | |
623 | * it is in the AIL and anyone is waiting on it. Don't do | |
624 | * this if the caller has asked us not to. | |
625 | */ | |
783a2f65 | 626 | xfs_trans_unlocked_item(ip->i_itemp->ili_item.li_ailp, |
579aa9ca | 627 | (xfs_log_item_t*)(ip->i_itemp)); |
1da177e4 | 628 | } |
0b1b213f | 629 | trace_xfs_iunlock(ip, lock_flags, _RET_IP_); |
1da177e4 LT |
630 | } |
631 | ||
632 | /* | |
633 | * give up write locks. the i/o lock cannot be held nested | |
634 | * if it is being demoted. | |
635 | */ | |
636 | void | |
579aa9ca CH |
637 | xfs_ilock_demote( |
638 | xfs_inode_t *ip, | |
639 | uint lock_flags) | |
1da177e4 LT |
640 | { |
641 | ASSERT(lock_flags & (XFS_IOLOCK_EXCL|XFS_ILOCK_EXCL)); | |
642 | ASSERT((lock_flags & ~(XFS_IOLOCK_EXCL|XFS_ILOCK_EXCL)) == 0); | |
643 | ||
579aa9ca | 644 | if (lock_flags & XFS_ILOCK_EXCL) |
1da177e4 | 645 | mrdemote(&ip->i_lock); |
579aa9ca | 646 | if (lock_flags & XFS_IOLOCK_EXCL) |
1da177e4 | 647 | mrdemote(&ip->i_iolock); |
0b1b213f CH |
648 | |
649 | trace_xfs_ilock_demote(ip, lock_flags, _RET_IP_); | |
579aa9ca CH |
650 | } |
651 | ||
652 | #ifdef DEBUG | |
579aa9ca CH |
653 | int |
654 | xfs_isilocked( | |
655 | xfs_inode_t *ip, | |
656 | uint lock_flags) | |
657 | { | |
f9369729 CH |
658 | if (lock_flags & (XFS_ILOCK_EXCL|XFS_ILOCK_SHARED)) { |
659 | if (!(lock_flags & XFS_ILOCK_SHARED)) | |
660 | return !!ip->i_lock.mr_writer; | |
661 | return rwsem_is_locked(&ip->i_lock.mr_lock); | |
1da177e4 | 662 | } |
579aa9ca | 663 | |
f9369729 CH |
664 | if (lock_flags & (XFS_IOLOCK_EXCL|XFS_IOLOCK_SHARED)) { |
665 | if (!(lock_flags & XFS_IOLOCK_SHARED)) | |
666 | return !!ip->i_iolock.mr_writer; | |
667 | return rwsem_is_locked(&ip->i_iolock.mr_lock); | |
579aa9ca CH |
668 | } |
669 | ||
f9369729 CH |
670 | ASSERT(0); |
671 | return 0; | |
1da177e4 | 672 | } |
579aa9ca | 673 | #endif |