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