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" |
a844f451 | 21 | #include "xfs_bit.h" |
1da177e4 | 22 | #include "xfs_log.h" |
a844f451 | 23 | #include "xfs_inum.h" |
1da177e4 LT |
24 | #include "xfs_trans.h" |
25 | #include "xfs_sb.h" | |
26 | #include "xfs_ag.h" | |
1da177e4 LT |
27 | #include "xfs_dir2.h" |
28 | #include "xfs_dmapi.h" | |
29 | #include "xfs_mount.h" | |
1da177e4 | 30 | #include "xfs_bmap_btree.h" |
a844f451 | 31 | #include "xfs_alloc_btree.h" |
1da177e4 | 32 | #include "xfs_ialloc_btree.h" |
1da177e4 | 33 | #include "xfs_dir2_sf.h" |
a844f451 | 34 | #include "xfs_attr_sf.h" |
1da177e4 LT |
35 | #include "xfs_dinode.h" |
36 | #include "xfs_inode.h" | |
a844f451 NS |
37 | #include "xfs_btree.h" |
38 | #include "xfs_ialloc.h" | |
1da177e4 LT |
39 | #include "xfs_quota.h" |
40 | #include "xfs_utils.h" | |
1da177e4 | 41 | |
1da177e4 LT |
42 | /* |
43 | * Look up an inode by number in the given file system. | |
da353b0d DC |
44 | * The inode is looked up in the cache held in each AG. |
45 | * If the inode is found in the cache, attach it to the provided | |
46 | * vnode. | |
1da177e4 | 47 | * |
da353b0d DC |
48 | * If it is not in core, read it in from the file system's device, |
49 | * add it to the cache and attach the provided vnode. | |
1da177e4 LT |
50 | * |
51 | * The inode is locked according to the value of the lock_flags parameter. | |
52 | * This flag parameter indicates how and if the inode's IO lock and inode lock | |
53 | * should be taken. | |
54 | * | |
55 | * mp -- the mount point structure for the current file system. It points | |
56 | * to the inode hash table. | |
57 | * tp -- a pointer to the current transaction if there is one. This is | |
58 | * simply passed through to the xfs_iread() call. | |
59 | * ino -- the number of the inode desired. This is the unique identifier | |
60 | * within the file system for the inode being requested. | |
61 | * lock_flags -- flags indicating how to lock the inode. See the comment | |
62 | * for xfs_ilock() for a list of valid values. | |
63 | * bno -- the block number starting the buffer containing the inode, | |
64 | * if known (as by bulkstat), else 0. | |
65 | */ | |
66 | STATIC int | |
67 | xfs_iget_core( | |
10090be2 | 68 | struct inode *inode, |
1da177e4 LT |
69 | xfs_mount_t *mp, |
70 | xfs_trans_t *tp, | |
71 | xfs_ino_t ino, | |
72 | uint flags, | |
73 | uint lock_flags, | |
74 | xfs_inode_t **ipp, | |
75 | xfs_daddr_t bno) | |
76 | { | |
10090be2 | 77 | struct inode *old_inode; |
1da177e4 LT |
78 | xfs_inode_t *ip; |
79 | xfs_inode_t *iq; | |
1da177e4 | 80 | int error; |
da353b0d DC |
81 | xfs_icluster_t *icl, *new_icl = NULL; |
82 | unsigned long first_index, mask; | |
83 | xfs_perag_t *pag; | |
84 | xfs_agino_t agino; | |
85 | ||
86 | /* the radix tree exists only in inode capable AGs */ | |
87 | if (XFS_INO_TO_AGNO(mp, ino) >= mp->m_maxagi) | |
88 | return EINVAL; | |
89 | ||
90 | /* get the perag structure and ensure that it's inode capable */ | |
91 | pag = xfs_get_perag(mp, ino); | |
92 | if (!pag->pagi_inodeok) | |
93 | return EINVAL; | |
94 | ASSERT(pag->pag_ici_init); | |
95 | agino = XFS_INO_TO_AGINO(mp, ino); | |
1da177e4 LT |
96 | |
97 | again: | |
da353b0d DC |
98 | read_lock(&pag->pag_ici_lock); |
99 | ip = radix_tree_lookup(&pag->pag_ici_root, agino); | |
100 | ||
101 | if (ip != NULL) { | |
102 | /* | |
103 | * If INEW is set this inode is being set up | |
104 | * we need to pause and try again. | |
105 | */ | |
106 | if (xfs_iflags_test(ip, XFS_INEW)) { | |
107 | read_unlock(&pag->pag_ici_lock); | |
108 | delay(1); | |
109 | XFS_STATS_INC(xs_ig_frecycle); | |
110 | ||
111 | goto again; | |
112 | } | |
1da177e4 | 113 | |
10090be2 CH |
114 | old_inode = ip->i_vnode; |
115 | if (old_inode == NULL) { | |
1da177e4 | 116 | /* |
da353b0d DC |
117 | * If IRECLAIM is set this inode is |
118 | * on its way out of the system, | |
1da177e4 LT |
119 | * we need to pause and try again. |
120 | */ | |
da353b0d DC |
121 | if (xfs_iflags_test(ip, XFS_IRECLAIM)) { |
122 | read_unlock(&pag->pag_ici_lock); | |
1da177e4 LT |
123 | delay(1); |
124 | XFS_STATS_INC(xs_ig_frecycle); | |
125 | ||
126 | goto again; | |
127 | } | |
da353b0d | 128 | ASSERT(xfs_iflags_test(ip, XFS_IRECLAIMABLE)); |
1da177e4 | 129 | |
da353b0d DC |
130 | /* |
131 | * If lookup is racing with unlink, then we | |
132 | * should return an error immediately so we | |
133 | * don't remove it from the reclaim list and | |
134 | * potentially leak the inode. | |
135 | */ | |
136 | if ((ip->i_d.di_mode == 0) && | |
137 | !(flags & XFS_IGET_CREATE)) { | |
138 | read_unlock(&pag->pag_ici_lock); | |
139 | xfs_put_perag(mp, pag); | |
140 | return ENOENT; | |
141 | } | |
1da177e4 | 142 | |
15947f2d | 143 | xfs_itrace_exit_tag(ip, "xfs_iget.alloc"); |
1da177e4 | 144 | |
da353b0d | 145 | XFS_STATS_INC(xs_ig_found); |
da353b0d DC |
146 | xfs_iflags_clear(ip, XFS_IRECLAIMABLE); |
147 | read_unlock(&pag->pag_ici_lock); | |
1da177e4 | 148 | |
da353b0d DC |
149 | XFS_MOUNT_ILOCK(mp); |
150 | list_del_init(&ip->i_reclaim); | |
151 | XFS_MOUNT_IUNLOCK(mp); | |
1da177e4 | 152 | |
da353b0d | 153 | goto finish_inode; |
1da177e4 | 154 | |
10090be2 | 155 | } else if (inode != old_inode) { |
da353b0d DC |
156 | /* The inode is being torn down, pause and |
157 | * try again. | |
71bce256 | 158 | */ |
10090be2 | 159 | if (old_inode->i_state & (I_FREEING | I_CLEAR)) { |
da353b0d DC |
160 | read_unlock(&pag->pag_ici_lock); |
161 | delay(1); | |
162 | XFS_STATS_INC(xs_ig_frecycle); | |
1da177e4 | 163 | |
da353b0d | 164 | goto again; |
1da177e4 | 165 | } |
da353b0d DC |
166 | /* Chances are the other vnode (the one in the inode) is being torn |
167 | * down right now, and we landed on top of it. Question is, what do | |
168 | * we do? Unhook the old inode and hook up the new one? | |
169 | */ | |
170 | cmn_err(CE_PANIC, | |
171 | "xfs_iget_core: ambiguous vns: vp/0x%p, invp/0x%p", | |
10090be2 | 172 | old_inode, inode); |
da353b0d | 173 | } |
745b1f47 | 174 | |
da353b0d DC |
175 | /* |
176 | * Inode cache hit | |
177 | */ | |
178 | read_unlock(&pag->pag_ici_lock); | |
179 | XFS_STATS_INC(xs_ig_found); | |
1da177e4 | 180 | |
da353b0d | 181 | finish_inode: |
613d7043 CH |
182 | if (ip->i_d.di_mode == 0 && !(flags & XFS_IGET_CREATE)) { |
183 | xfs_put_perag(mp, pag); | |
184 | return ENOENT; | |
1da177e4 | 185 | } |
da353b0d DC |
186 | |
187 | if (lock_flags != 0) | |
188 | xfs_ilock(ip, lock_flags); | |
189 | ||
190 | xfs_iflags_clear(ip, XFS_ISTALE); | |
15947f2d | 191 | xfs_itrace_exit_tag(ip, "xfs_iget.found"); |
da353b0d | 192 | goto return_ip; |
1da177e4 LT |
193 | } |
194 | ||
195 | /* | |
da353b0d | 196 | * Inode cache miss |
1da177e4 | 197 | */ |
da353b0d | 198 | read_unlock(&pag->pag_ici_lock); |
1da177e4 LT |
199 | XFS_STATS_INC(xs_ig_missed); |
200 | ||
1da177e4 LT |
201 | /* |
202 | * Read the disk inode attributes into a new inode structure and get | |
203 | * a new vnode for it. This should also initialize i_ino and i_mount. | |
204 | */ | |
745b1f47 NS |
205 | error = xfs_iread(mp, tp, ino, &ip, bno, |
206 | (flags & XFS_IGET_BULKSTAT) ? XFS_IMAP_BULKSTAT : 0); | |
da353b0d DC |
207 | if (error) { |
208 | xfs_put_perag(mp, pag); | |
1da177e4 | 209 | return error; |
da353b0d | 210 | } |
1da177e4 | 211 | |
15947f2d | 212 | xfs_itrace_exit_tag(ip, "xfs_iget.alloc"); |
1da177e4 | 213 | |
10090be2 CH |
214 | |
215 | mrlock_init(&ip->i_lock, MRLOCK_ALLOW_EQUAL_PRI|MRLOCK_BARRIER, | |
216 | "xfsino", ip->i_ino); | |
217 | mrlock_init(&ip->i_iolock, MRLOCK_BARRIER, "xfsio", ip->i_ino); | |
218 | init_waitqueue_head(&ip->i_ipin_wait); | |
219 | atomic_set(&ip->i_pincount, 0); | |
220 | initnsema(&ip->i_flock, 1, "xfsfino"); | |
221 | ||
745b1f47 | 222 | if (lock_flags) |
1da177e4 | 223 | xfs_ilock(ip, lock_flags); |
745b1f47 NS |
224 | |
225 | if ((ip->i_d.di_mode == 0) && !(flags & XFS_IGET_CREATE)) { | |
1da177e4 | 226 | xfs_idestroy(ip); |
da353b0d | 227 | xfs_put_perag(mp, pag); |
1da177e4 LT |
228 | return ENOENT; |
229 | } | |
230 | ||
231 | /* | |
da353b0d DC |
232 | * This is a bit messy - we preallocate everything we _might_ |
233 | * need before we pick up the ici lock. That way we don't have to | |
234 | * juggle locks and go all the way back to the start. | |
1da177e4 | 235 | */ |
da353b0d DC |
236 | new_icl = kmem_zone_alloc(xfs_icluster_zone, KM_SLEEP); |
237 | if (radix_tree_preload(GFP_KERNEL)) { | |
238 | delay(1); | |
239 | goto again; | |
240 | } | |
241 | mask = ~(((XFS_INODE_CLUSTER_SIZE(mp) >> mp->m_sb.sb_inodelog)) - 1); | |
242 | first_index = agino & mask; | |
243 | write_lock(&pag->pag_ici_lock); | |
1da177e4 | 244 | |
da353b0d DC |
245 | /* |
246 | * Find the cluster if it exists | |
247 | */ | |
248 | icl = NULL; | |
249 | if (radix_tree_gang_lookup(&pag->pag_ici_root, (void**)&iq, | |
250 | first_index, 1)) { | |
a7430847 | 251 | if ((XFS_INO_TO_AGINO(mp, iq->i_ino) & mask) == first_index) |
da353b0d DC |
252 | icl = iq->i_cluster; |
253 | } | |
1da177e4 | 254 | |
da353b0d DC |
255 | /* |
256 | * insert the new inode | |
257 | */ | |
258 | error = radix_tree_insert(&pag->pag_ici_root, agino, ip); | |
259 | if (unlikely(error)) { | |
260 | BUG_ON(error != -EEXIST); | |
261 | write_unlock(&pag->pag_ici_lock); | |
262 | radix_tree_preload_end(); | |
263 | xfs_idestroy(ip); | |
264 | XFS_STATS_INC(xs_ig_dup); | |
265 | goto again; | |
1da177e4 LT |
266 | } |
267 | ||
268 | /* | |
269 | * These values _must_ be set before releasing ihlock! | |
270 | */ | |
1da177e4 | 271 | ip->i_udquot = ip->i_gdquot = NULL; |
7a18c386 | 272 | xfs_iflags_set(ip, XFS_INEW); |
1da177e4 | 273 | |
da353b0d | 274 | ASSERT(ip->i_cluster == NULL); |
1da177e4 | 275 | |
da353b0d DC |
276 | if (!icl) { |
277 | spin_lock_init(&new_icl->icl_lock); | |
278 | INIT_HLIST_HEAD(&new_icl->icl_inodes); | |
279 | icl = new_icl; | |
280 | new_icl = NULL; | |
1da177e4 | 281 | } else { |
da353b0d | 282 | ASSERT(!hlist_empty(&icl->icl_inodes)); |
1da177e4 | 283 | } |
da353b0d DC |
284 | spin_lock(&icl->icl_lock); |
285 | hlist_add_head(&ip->i_cnode, &icl->icl_inodes); | |
286 | ip->i_cluster = icl; | |
287 | spin_unlock(&icl->icl_lock); | |
1da177e4 | 288 | |
da353b0d DC |
289 | write_unlock(&pag->pag_ici_lock); |
290 | radix_tree_preload_end(); | |
291 | if (new_icl) | |
292 | kmem_zone_free(xfs_icluster_zone, new_icl); | |
1da177e4 LT |
293 | |
294 | /* | |
295 | * Link ip to its mount and thread it on the mount's inode list. | |
296 | */ | |
297 | XFS_MOUNT_ILOCK(mp); | |
298 | if ((iq = mp->m_inodes)) { | |
299 | ASSERT(iq->i_mprev->i_mnext == iq); | |
300 | ip->i_mprev = iq->i_mprev; | |
301 | iq->i_mprev->i_mnext = ip; | |
302 | iq->i_mprev = ip; | |
303 | ip->i_mnext = iq; | |
304 | } else { | |
305 | ip->i_mnext = ip; | |
306 | ip->i_mprev = ip; | |
307 | } | |
308 | mp->m_inodes = ip; | |
309 | ||
310 | XFS_MOUNT_IUNLOCK(mp); | |
da353b0d | 311 | xfs_put_perag(mp, pag); |
1da177e4 LT |
312 | |
313 | return_ip: | |
314 | ASSERT(ip->i_df.if_ext_max == | |
315 | XFS_IFORK_DSIZE(ip) / sizeof(xfs_bmbt_rec_t)); | |
316 | ||
b3aea4ed | 317 | xfs_iflags_set(ip, XFS_IMODIFIED); |
1da177e4 LT |
318 | *ipp = ip; |
319 | ||
320 | /* | |
321 | * If we have a real type for an on-disk inode, we can set ops(&unlock) | |
322 | * now. If it's a new inode being created, xfs_ialloc will handle it. | |
323 | */ | |
10090be2 | 324 | xfs_initialize_vnode(mp, inode, ip); |
1da177e4 LT |
325 | return 0; |
326 | } | |
327 | ||
328 | ||
329 | /* | |
330 | * The 'normal' internal xfs_iget, if needed it will | |
331 | * 'allocate', or 'get', the vnode. | |
332 | */ | |
333 | int | |
334 | xfs_iget( | |
335 | xfs_mount_t *mp, | |
336 | xfs_trans_t *tp, | |
337 | xfs_ino_t ino, | |
338 | uint flags, | |
339 | uint lock_flags, | |
340 | xfs_inode_t **ipp, | |
341 | xfs_daddr_t bno) | |
342 | { | |
343 | struct inode *inode; | |
10090be2 | 344 | xfs_inode_t *ip; |
1da177e4 LT |
345 | int error; |
346 | ||
1da177e4 LT |
347 | XFS_STATS_INC(xs_ig_attempts); |
348 | ||
ba403ab4 | 349 | retry: |
b267ce99 | 350 | inode = iget_locked(mp->m_super, ino); |
10090be2 CH |
351 | if (!inode) |
352 | /* If we got no inode we are out of memory */ | |
353 | return ENOMEM; | |
354 | ||
355 | if (inode->i_state & I_NEW) { | |
356 | XFS_STATS_INC(vn_active); | |
357 | XFS_STATS_INC(vn_alloc); | |
358 | ||
359 | error = xfs_iget_core(inode, mp, tp, ino, flags, | |
360 | lock_flags, ipp, bno); | |
361 | if (error) { | |
362 | make_bad_inode(inode); | |
363 | if (inode->i_state & I_NEW) | |
364 | unlock_new_inode(inode); | |
365 | iput(inode); | |
1da177e4 | 366 | } |
10090be2 CH |
367 | return error; |
368 | } | |
1da177e4 | 369 | |
10090be2 CH |
370 | /* |
371 | * If the inode is not fully constructed due to | |
372 | * filehandle mismatches wait for the inode to go | |
373 | * away and try again. | |
374 | * | |
375 | * iget_locked will call __wait_on_freeing_inode | |
376 | * to wait for the inode to go away. | |
377 | */ | |
378 | if (is_bad_inode(inode)) { | |
379 | iput(inode); | |
380 | delay(1); | |
381 | goto retry; | |
382 | } | |
1da177e4 | 383 | |
10090be2 CH |
384 | ip = XFS_I(inode); |
385 | if (!ip) { | |
386 | iput(inode); | |
387 | delay(1); | |
388 | goto retry; | |
389 | } | |
390 | ||
391 | if (lock_flags != 0) | |
392 | xfs_ilock(ip, lock_flags); | |
393 | XFS_STATS_INC(xs_ig_found); | |
394 | *ipp = ip; | |
395 | return 0; | |
1da177e4 LT |
396 | } |
397 | ||
398 | /* | |
399 | * Look for the inode corresponding to the given ino in the hash table. | |
400 | * If it is there and its i_transp pointer matches tp, return it. | |
401 | * Otherwise, return NULL. | |
402 | */ | |
403 | xfs_inode_t * | |
404 | xfs_inode_incore(xfs_mount_t *mp, | |
405 | xfs_ino_t ino, | |
406 | xfs_trans_t *tp) | |
407 | { | |
1da177e4 | 408 | xfs_inode_t *ip; |
da353b0d DC |
409 | xfs_perag_t *pag; |
410 | ||
411 | pag = xfs_get_perag(mp, ino); | |
412 | read_lock(&pag->pag_ici_lock); | |
413 | ip = radix_tree_lookup(&pag->pag_ici_root, XFS_INO_TO_AGINO(mp, ino)); | |
414 | read_unlock(&pag->pag_ici_lock); | |
415 | xfs_put_perag(mp, pag); | |
416 | ||
417 | /* the returned inode must match the transaction */ | |
418 | if (ip && (ip->i_transp != tp)) | |
419 | return NULL; | |
420 | return ip; | |
1da177e4 LT |
421 | } |
422 | ||
423 | /* | |
424 | * Decrement reference count of an inode structure and unlock it. | |
425 | * | |
426 | * ip -- the inode being released | |
427 | * lock_flags -- this parameter indicates the inode's locks to be | |
428 | * to be released. See the comment on xfs_iunlock() for a list | |
429 | * of valid values. | |
430 | */ | |
431 | void | |
432 | xfs_iput(xfs_inode_t *ip, | |
433 | uint lock_flags) | |
434 | { | |
cf441eeb | 435 | xfs_itrace_entry(ip); |
1da177e4 | 436 | xfs_iunlock(ip, lock_flags); |
10090be2 | 437 | IRELE(ip); |
1da177e4 LT |
438 | } |
439 | ||
440 | /* | |
441 | * Special iput for brand-new inodes that are still locked | |
442 | */ | |
443 | void | |
444 | xfs_iput_new(xfs_inode_t *ip, | |
445 | uint lock_flags) | |
446 | { | |
10090be2 | 447 | struct inode *inode = ip->i_vnode; |
1da177e4 | 448 | |
cf441eeb | 449 | xfs_itrace_entry(ip); |
1da177e4 LT |
450 | |
451 | if ((ip->i_d.di_mode == 0)) { | |
7a18c386 | 452 | ASSERT(!xfs_iflags_test(ip, XFS_IRECLAIMABLE)); |
10090be2 | 453 | make_bad_inode(inode); |
1da177e4 LT |
454 | } |
455 | if (inode->i_state & I_NEW) | |
456 | unlock_new_inode(inode); | |
457 | if (lock_flags) | |
458 | xfs_iunlock(ip, lock_flags); | |
10090be2 | 459 | IRELE(ip); |
1da177e4 LT |
460 | } |
461 | ||
462 | ||
463 | /* | |
464 | * This routine embodies the part of the reclaim code that pulls | |
465 | * the inode from the inode hash table and the mount structure's | |
466 | * inode list. | |
467 | * This should only be called from xfs_reclaim(). | |
468 | */ | |
469 | void | |
470 | xfs_ireclaim(xfs_inode_t *ip) | |
471 | { | |
1da177e4 LT |
472 | /* |
473 | * Remove from old hash list and mount list. | |
474 | */ | |
475 | XFS_STATS_INC(xs_ig_reclaims); | |
476 | ||
477 | xfs_iextract(ip); | |
478 | ||
479 | /* | |
480 | * Here we do a spurious inode lock in order to coordinate with | |
481 | * xfs_sync(). This is because xfs_sync() references the inodes | |
482 | * in the mount list without taking references on the corresponding | |
483 | * vnodes. We make that OK here by ensuring that we wait until | |
484 | * the inode is unlocked in xfs_sync() before we go ahead and | |
485 | * free it. We get both the regular lock and the io lock because | |
486 | * the xfs_sync() code may need to drop the regular one but will | |
487 | * still hold the io lock. | |
488 | */ | |
489 | xfs_ilock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL); | |
490 | ||
491 | /* | |
492 | * Release dquots (and their references) if any. An inode may escape | |
493 | * xfs_inactive and get here via vn_alloc->vn_reclaim path. | |
494 | */ | |
495 | XFS_QM_DQDETACH(ip->i_mount, ip); | |
496 | ||
497 | /* | |
498 | * Pull our behavior descriptor from the vnode chain. | |
499 | */ | |
10090be2 CH |
500 | if (ip->i_vnode) { |
501 | ip->i_vnode->i_private = NULL; | |
739bfb2a | 502 | ip->i_vnode = NULL; |
1da177e4 LT |
503 | } |
504 | ||
505 | /* | |
506 | * Free all memory associated with the inode. | |
507 | */ | |
439b8434 | 508 | xfs_iunlock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL); |
1da177e4 LT |
509 | xfs_idestroy(ip); |
510 | } | |
511 | ||
512 | /* | |
513 | * This routine removes an about-to-be-destroyed inode from | |
514 | * all of the lists in which it is located with the exception | |
515 | * of the behavior chain. | |
516 | */ | |
517 | void | |
518 | xfs_iextract( | |
519 | xfs_inode_t *ip) | |
520 | { | |
da353b0d DC |
521 | xfs_mount_t *mp = ip->i_mount; |
522 | xfs_perag_t *pag = xfs_get_perag(mp, ip->i_ino); | |
1da177e4 | 523 | xfs_inode_t *iq; |
da353b0d DC |
524 | |
525 | write_lock(&pag->pag_ici_lock); | |
526 | radix_tree_delete(&pag->pag_ici_root, XFS_INO_TO_AGINO(mp, ip->i_ino)); | |
527 | write_unlock(&pag->pag_ici_lock); | |
528 | xfs_put_perag(mp, pag); | |
1da177e4 LT |
529 | |
530 | /* | |
da353b0d | 531 | * Remove from cluster list |
1da177e4 LT |
532 | */ |
533 | mp = ip->i_mount; | |
da353b0d DC |
534 | spin_lock(&ip->i_cluster->icl_lock); |
535 | hlist_del(&ip->i_cnode); | |
536 | spin_unlock(&ip->i_cluster->icl_lock); | |
537 | ||
538 | /* was last inode in cluster? */ | |
539 | if (hlist_empty(&ip->i_cluster->icl_inodes)) | |
540 | kmem_zone_free(xfs_icluster_zone, ip->i_cluster); | |
1da177e4 LT |
541 | |
542 | /* | |
543 | * Remove from mount's inode list. | |
544 | */ | |
545 | XFS_MOUNT_ILOCK(mp); | |
546 | ASSERT((ip->i_mnext != NULL) && (ip->i_mprev != NULL)); | |
547 | iq = ip->i_mnext; | |
548 | iq->i_mprev = ip->i_mprev; | |
549 | ip->i_mprev->i_mnext = iq; | |
550 | ||
551 | /* | |
552 | * Fix up the head pointer if it points to the inode being deleted. | |
553 | */ | |
554 | if (mp->m_inodes == ip) { | |
555 | if (ip == iq) { | |
556 | mp->m_inodes = NULL; | |
557 | } else { | |
558 | mp->m_inodes = iq; | |
559 | } | |
560 | } | |
561 | ||
562 | /* Deal with the deleted inodes list */ | |
563 | list_del_init(&ip->i_reclaim); | |
564 | ||
565 | mp->m_ireclaims++; | |
566 | XFS_MOUNT_IUNLOCK(mp); | |
567 | } | |
568 | ||
569 | /* | |
570 | * This is a wrapper routine around the xfs_ilock() routine | |
571 | * used to centralize some grungy code. It is used in places | |
572 | * that wish to lock the inode solely for reading the extents. | |
573 | * The reason these places can't just call xfs_ilock(SHARED) | |
574 | * is that the inode lock also guards to bringing in of the | |
575 | * extents from disk for a file in b-tree format. If the inode | |
576 | * is in b-tree format, then we need to lock the inode exclusively | |
577 | * until the extents are read in. Locking it exclusively all | |
578 | * the time would limit our parallelism unnecessarily, though. | |
579 | * What we do instead is check to see if the extents have been | |
580 | * read in yet, and only lock the inode exclusively if they | |
581 | * have not. | |
582 | * | |
583 | * The function returns a value which should be given to the | |
584 | * corresponding xfs_iunlock_map_shared(). This value is | |
585 | * the mode in which the lock was actually taken. | |
586 | */ | |
587 | uint | |
588 | xfs_ilock_map_shared( | |
589 | xfs_inode_t *ip) | |
590 | { | |
591 | uint lock_mode; | |
592 | ||
593 | if ((ip->i_d.di_format == XFS_DINODE_FMT_BTREE) && | |
594 | ((ip->i_df.if_flags & XFS_IFEXTENTS) == 0)) { | |
595 | lock_mode = XFS_ILOCK_EXCL; | |
596 | } else { | |
597 | lock_mode = XFS_ILOCK_SHARED; | |
598 | } | |
599 | ||
600 | xfs_ilock(ip, lock_mode); | |
601 | ||
602 | return lock_mode; | |
603 | } | |
604 | ||
605 | /* | |
606 | * This is simply the unlock routine to go with xfs_ilock_map_shared(). | |
607 | * All it does is call xfs_iunlock() with the given lock_mode. | |
608 | */ | |
609 | void | |
610 | xfs_iunlock_map_shared( | |
611 | xfs_inode_t *ip, | |
612 | unsigned int lock_mode) | |
613 | { | |
614 | xfs_iunlock(ip, lock_mode); | |
615 | } | |
616 | ||
617 | /* | |
618 | * The xfs inode contains 2 locks: a multi-reader lock called the | |
619 | * i_iolock and a multi-reader lock called the i_lock. This routine | |
620 | * allows either or both of the locks to be obtained. | |
621 | * | |
622 | * The 2 locks should always be ordered so that the IO lock is | |
623 | * obtained first in order to prevent deadlock. | |
624 | * | |
625 | * ip -- the inode being locked | |
626 | * lock_flags -- this parameter indicates the inode's locks | |
627 | * to be locked. It can be: | |
628 | * XFS_IOLOCK_SHARED, | |
629 | * XFS_IOLOCK_EXCL, | |
630 | * XFS_ILOCK_SHARED, | |
631 | * XFS_ILOCK_EXCL, | |
632 | * XFS_IOLOCK_SHARED | XFS_ILOCK_SHARED, | |
633 | * XFS_IOLOCK_SHARED | XFS_ILOCK_EXCL, | |
634 | * XFS_IOLOCK_EXCL | XFS_ILOCK_SHARED, | |
635 | * XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL | |
636 | */ | |
637 | void | |
638 | xfs_ilock(xfs_inode_t *ip, | |
639 | uint lock_flags) | |
640 | { | |
641 | /* | |
642 | * You can't set both SHARED and EXCL for the same lock, | |
643 | * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED, | |
644 | * and XFS_ILOCK_EXCL are valid values to set in lock_flags. | |
645 | */ | |
646 | ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) != | |
647 | (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)); | |
648 | ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) != | |
649 | (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)); | |
f7c66ce3 | 650 | ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_DEP_MASK)) == 0); |
1da177e4 LT |
651 | |
652 | if (lock_flags & XFS_IOLOCK_EXCL) { | |
f7c66ce3 | 653 | mrupdate_nested(&ip->i_iolock, XFS_IOLOCK_DEP(lock_flags)); |
1da177e4 | 654 | } else if (lock_flags & XFS_IOLOCK_SHARED) { |
f7c66ce3 | 655 | mraccess_nested(&ip->i_iolock, XFS_IOLOCK_DEP(lock_flags)); |
1da177e4 LT |
656 | } |
657 | if (lock_flags & XFS_ILOCK_EXCL) { | |
f7c66ce3 | 658 | mrupdate_nested(&ip->i_lock, XFS_ILOCK_DEP(lock_flags)); |
1da177e4 | 659 | } else if (lock_flags & XFS_ILOCK_SHARED) { |
f7c66ce3 | 660 | mraccess_nested(&ip->i_lock, XFS_ILOCK_DEP(lock_flags)); |
1da177e4 LT |
661 | } |
662 | xfs_ilock_trace(ip, 1, lock_flags, (inst_t *)__return_address); | |
663 | } | |
664 | ||
665 | /* | |
666 | * This is just like xfs_ilock(), except that the caller | |
667 | * is guaranteed not to sleep. It returns 1 if it gets | |
668 | * the requested locks and 0 otherwise. If the IO lock is | |
669 | * obtained but the inode lock cannot be, then the IO lock | |
670 | * is dropped before returning. | |
671 | * | |
672 | * ip -- the inode being locked | |
673 | * lock_flags -- this parameter indicates the inode's locks to be | |
674 | * to be locked. See the comment for xfs_ilock() for a list | |
675 | * of valid values. | |
676 | * | |
677 | */ | |
678 | int | |
679 | xfs_ilock_nowait(xfs_inode_t *ip, | |
680 | uint lock_flags) | |
681 | { | |
682 | int iolocked; | |
683 | int ilocked; | |
684 | ||
685 | /* | |
686 | * You can't set both SHARED and EXCL for the same lock, | |
687 | * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED, | |
688 | * and XFS_ILOCK_EXCL are valid values to set in lock_flags. | |
689 | */ | |
690 | ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) != | |
691 | (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)); | |
692 | ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) != | |
693 | (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)); | |
f7c66ce3 | 694 | ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_DEP_MASK)) == 0); |
1da177e4 LT |
695 | |
696 | iolocked = 0; | |
697 | if (lock_flags & XFS_IOLOCK_EXCL) { | |
698 | iolocked = mrtryupdate(&ip->i_iolock); | |
699 | if (!iolocked) { | |
700 | return 0; | |
701 | } | |
702 | } else if (lock_flags & XFS_IOLOCK_SHARED) { | |
703 | iolocked = mrtryaccess(&ip->i_iolock); | |
704 | if (!iolocked) { | |
705 | return 0; | |
706 | } | |
707 | } | |
708 | if (lock_flags & XFS_ILOCK_EXCL) { | |
709 | ilocked = mrtryupdate(&ip->i_lock); | |
710 | if (!ilocked) { | |
711 | if (iolocked) { | |
712 | mrunlock(&ip->i_iolock); | |
713 | } | |
714 | return 0; | |
715 | } | |
716 | } else if (lock_flags & XFS_ILOCK_SHARED) { | |
717 | ilocked = mrtryaccess(&ip->i_lock); | |
718 | if (!ilocked) { | |
719 | if (iolocked) { | |
720 | mrunlock(&ip->i_iolock); | |
721 | } | |
722 | return 0; | |
723 | } | |
724 | } | |
725 | xfs_ilock_trace(ip, 2, lock_flags, (inst_t *)__return_address); | |
726 | return 1; | |
727 | } | |
728 | ||
729 | /* | |
730 | * xfs_iunlock() is used to drop the inode locks acquired with | |
731 | * xfs_ilock() and xfs_ilock_nowait(). The caller must pass | |
732 | * in the flags given to xfs_ilock() or xfs_ilock_nowait() so | |
733 | * that we know which locks to drop. | |
734 | * | |
735 | * ip -- the inode being unlocked | |
736 | * lock_flags -- this parameter indicates the inode's locks to be | |
737 | * to be unlocked. See the comment for xfs_ilock() for a list | |
738 | * of valid values for this parameter. | |
739 | * | |
740 | */ | |
741 | void | |
742 | xfs_iunlock(xfs_inode_t *ip, | |
743 | uint lock_flags) | |
744 | { | |
745 | /* | |
746 | * You can't set both SHARED and EXCL for the same lock, | |
747 | * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED, | |
748 | * and XFS_ILOCK_EXCL are valid values to set in lock_flags. | |
749 | */ | |
750 | ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) != | |
751 | (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)); | |
752 | ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) != | |
753 | (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)); | |
f7c66ce3 LM |
754 | ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_IUNLOCK_NONOTIFY | |
755 | XFS_LOCK_DEP_MASK)) == 0); | |
1da177e4 LT |
756 | ASSERT(lock_flags != 0); |
757 | ||
758 | if (lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) { | |
759 | ASSERT(!(lock_flags & XFS_IOLOCK_SHARED) || | |
760 | (ismrlocked(&ip->i_iolock, MR_ACCESS))); | |
761 | ASSERT(!(lock_flags & XFS_IOLOCK_EXCL) || | |
762 | (ismrlocked(&ip->i_iolock, MR_UPDATE))); | |
763 | mrunlock(&ip->i_iolock); | |
764 | } | |
765 | ||
766 | if (lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) { | |
767 | ASSERT(!(lock_flags & XFS_ILOCK_SHARED) || | |
768 | (ismrlocked(&ip->i_lock, MR_ACCESS))); | |
769 | ASSERT(!(lock_flags & XFS_ILOCK_EXCL) || | |
770 | (ismrlocked(&ip->i_lock, MR_UPDATE))); | |
771 | mrunlock(&ip->i_lock); | |
772 | ||
773 | /* | |
774 | * Let the AIL know that this item has been unlocked in case | |
775 | * it is in the AIL and anyone is waiting on it. Don't do | |
776 | * this if the caller has asked us not to. | |
777 | */ | |
778 | if (!(lock_flags & XFS_IUNLOCK_NONOTIFY) && | |
779 | ip->i_itemp != NULL) { | |
780 | xfs_trans_unlocked_item(ip->i_mount, | |
781 | (xfs_log_item_t*)(ip->i_itemp)); | |
782 | } | |
783 | } | |
784 | xfs_ilock_trace(ip, 3, lock_flags, (inst_t *)__return_address); | |
785 | } | |
786 | ||
787 | /* | |
788 | * give up write locks. the i/o lock cannot be held nested | |
789 | * if it is being demoted. | |
790 | */ | |
791 | void | |
792 | xfs_ilock_demote(xfs_inode_t *ip, | |
793 | uint lock_flags) | |
794 | { | |
795 | ASSERT(lock_flags & (XFS_IOLOCK_EXCL|XFS_ILOCK_EXCL)); | |
796 | ASSERT((lock_flags & ~(XFS_IOLOCK_EXCL|XFS_ILOCK_EXCL)) == 0); | |
797 | ||
798 | if (lock_flags & XFS_ILOCK_EXCL) { | |
799 | ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE)); | |
800 | mrdemote(&ip->i_lock); | |
801 | } | |
802 | if (lock_flags & XFS_IOLOCK_EXCL) { | |
803 | ASSERT(ismrlocked(&ip->i_iolock, MR_UPDATE)); | |
804 | mrdemote(&ip->i_iolock); | |
805 | } | |
806 | } | |
807 | ||
808 | /* | |
809 | * The following three routines simply manage the i_flock | |
810 | * semaphore embedded in the inode. This semaphore synchronizes | |
811 | * processes attempting to flush the in-core inode back to disk. | |
812 | */ | |
813 | void | |
814 | xfs_iflock(xfs_inode_t *ip) | |
815 | { | |
816 | psema(&(ip->i_flock), PINOD|PLTWAIT); | |
817 | } | |
818 | ||
819 | int | |
820 | xfs_iflock_nowait(xfs_inode_t *ip) | |
821 | { | |
822 | return (cpsema(&(ip->i_flock))); | |
823 | } | |
824 | ||
825 | void | |
826 | xfs_ifunlock(xfs_inode_t *ip) | |
827 | { | |
0d8fee32 | 828 | ASSERT(issemalocked(&(ip->i_flock))); |
1da177e4 LT |
829 | vsema(&(ip->i_flock)); |
830 | } |