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" | |
783a2f65 DC |
41 | #include "xfs_trans_priv.h" |
42 | #include "xfs_inode_item.h" | |
24f211ba CH |
43 | #include "xfs_bmap.h" |
44 | #include "xfs_btree_trace.h" | |
45 | #include "xfs_dir2_trace.h" | |
46 | ||
47 | ||
48 | /* | |
49 | * Allocate and initialise an xfs_inode. | |
50 | */ | |
51 | STATIC struct xfs_inode * | |
52 | xfs_inode_alloc( | |
53 | struct xfs_mount *mp, | |
54 | xfs_ino_t ino) | |
55 | { | |
56 | struct xfs_inode *ip; | |
57 | ||
58 | /* | |
59 | * if this didn't occur in transactions, we could use | |
60 | * KM_MAYFAIL and return NULL here on ENOMEM. Set the | |
61 | * code up to do this anyway. | |
62 | */ | |
63 | ip = kmem_zone_alloc(xfs_inode_zone, KM_SLEEP); | |
64 | if (!ip) | |
65 | return NULL; | |
66 | ||
67 | ASSERT(atomic_read(&ip->i_iocount) == 0); | |
68 | ASSERT(atomic_read(&ip->i_pincount) == 0); | |
69 | ASSERT(!spin_is_locked(&ip->i_flags_lock)); | |
70 | ASSERT(completion_done(&ip->i_flush)); | |
71 | ||
24f211ba CH |
72 | /* initialise the xfs inode */ |
73 | ip->i_ino = ino; | |
74 | ip->i_mount = mp; | |
75 | memset(&ip->i_imap, 0, sizeof(struct xfs_imap)); | |
76 | ip->i_afp = NULL; | |
77 | memset(&ip->i_df, 0, sizeof(xfs_ifork_t)); | |
78 | ip->i_flags = 0; | |
79 | ip->i_update_core = 0; | |
80 | ip->i_update_size = 0; | |
81 | ip->i_delayed_blks = 0; | |
82 | memset(&ip->i_d, 0, sizeof(xfs_icdinode_t)); | |
83 | ip->i_size = 0; | |
84 | ip->i_new_size = 0; | |
85 | ||
86 | /* | |
87 | * Initialize inode's trace buffers. | |
88 | */ | |
89 | #ifdef XFS_INODE_TRACE | |
90 | ip->i_trace = ktrace_alloc(INODE_TRACE_SIZE, KM_NOFS); | |
91 | #endif | |
92 | #ifdef XFS_BMAP_TRACE | |
93 | ip->i_xtrace = ktrace_alloc(XFS_BMAP_KTRACE_SIZE, KM_NOFS); | |
94 | #endif | |
95 | #ifdef XFS_BTREE_TRACE | |
96 | ip->i_btrace = ktrace_alloc(XFS_BMBT_KTRACE_SIZE, KM_NOFS); | |
97 | #endif | |
98 | #ifdef XFS_RW_TRACE | |
99 | ip->i_rwtrace = ktrace_alloc(XFS_RW_KTRACE_SIZE, KM_NOFS); | |
100 | #endif | |
101 | #ifdef XFS_ILOCK_TRACE | |
102 | ip->i_lock_trace = ktrace_alloc(XFS_ILOCK_KTRACE_SIZE, KM_NOFS); | |
103 | #endif | |
104 | #ifdef XFS_DIR2_TRACE | |
105 | ip->i_dir_trace = ktrace_alloc(XFS_DIR2_KTRACE_SIZE, KM_NOFS); | |
106 | #endif | |
705db3fd DC |
107 | /* |
108 | * Now initialise the VFS inode. We do this after the xfs_inode | |
109 | * initialisation as internal failures will result in ->destroy_inode | |
110 | * being called and that will pass down through the reclaim path and | |
111 | * free the XFS inode. This path requires the XFS inode to already be | |
112 | * initialised. Hence if this call fails, the xfs_inode has already | |
113 | * been freed and we should not reference it at all in the error | |
114 | * handling. | |
115 | */ | |
116 | if (!inode_init_always(mp->m_super, VFS_I(ip))) | |
117 | return NULL; | |
118 | ||
119 | /* prevent anyone from using this yet */ | |
120 | VFS_I(ip)->i_state = I_NEW|I_LOCK; | |
24f211ba CH |
121 | |
122 | return ip; | |
123 | } | |
1da177e4 | 124 | |
1da177e4 | 125 | /* |
6441e549 | 126 | * Check the validity of the inode we just found it the cache |
1da177e4 | 127 | */ |
6441e549 DC |
128 | static int |
129 | xfs_iget_cache_hit( | |
6441e549 DC |
130 | struct xfs_perag *pag, |
131 | struct xfs_inode *ip, | |
132 | int flags, | |
133 | int lock_flags) __releases(pag->pag_ici_lock) | |
1da177e4 | 134 | { |
6441e549 | 135 | struct xfs_mount *mp = ip->i_mount; |
6bfb3d06 | 136 | int error = EAGAIN; |
da353b0d | 137 | |
6441e549 DC |
138 | /* |
139 | * If INEW is set this inode is being set up | |
bf904248 | 140 | * If IRECLAIM is set this inode is being torn down |
6441e549 DC |
141 | * Pause and try again. |
142 | */ | |
bf904248 | 143 | if (xfs_iflags_test(ip, (XFS_INEW|XFS_IRECLAIM))) { |
6441e549 DC |
144 | XFS_STATS_INC(xs_ig_frecycle); |
145 | goto out_error; | |
146 | } | |
da353b0d | 147 | |
bf904248 DC |
148 | /* If IRECLAIMABLE is set, we've torn down the vfs inode part */ |
149 | if (xfs_iflags_test(ip, XFS_IRECLAIMABLE)) { | |
150 | ||
da353b0d | 151 | /* |
bf904248 DC |
152 | * If lookup is racing with unlink, then we should return an |
153 | * error immediately so we don't remove it from the reclaim | |
154 | * list and potentially leak the inode. | |
da353b0d | 155 | */ |
bf904248 DC |
156 | if ((ip->i_d.di_mode == 0) && !(flags & XFS_IGET_CREATE)) { |
157 | error = ENOENT; | |
6441e549 DC |
158 | goto out_error; |
159 | } | |
bf904248 DC |
160 | |
161 | xfs_itrace_exit_tag(ip, "xfs_iget.alloc"); | |
da353b0d | 162 | |
6441e549 | 163 | /* |
bf904248 DC |
164 | * We need to re-initialise the VFS inode as it has been |
165 | * 'freed' by the VFS. Do this here so we can deal with | |
166 | * errors cleanly, then tag it so it can be set up correctly | |
167 | * later. | |
6441e549 | 168 | */ |
bf904248 DC |
169 | if (!inode_init_always(mp->m_super, VFS_I(ip))) { |
170 | error = ENOMEM; | |
6441e549 | 171 | goto out_error; |
da353b0d | 172 | } |
6bfb3d06 DC |
173 | |
174 | /* | |
175 | * We must set the XFS_INEW flag before clearing the | |
176 | * XFS_IRECLAIMABLE flag so that if a racing lookup does | |
177 | * not find the XFS_IRECLAIMABLE above but has the igrab() | |
178 | * below succeed we can safely check XFS_INEW to detect | |
179 | * that this inode is still being initialised. | |
180 | */ | |
bf904248 | 181 | xfs_iflags_set(ip, XFS_INEW); |
6441e549 | 182 | xfs_iflags_clear(ip, XFS_IRECLAIMABLE); |
396beb85 DC |
183 | |
184 | /* clear the radix tree reclaim flag as well. */ | |
185 | __xfs_inode_clear_reclaim_tag(mp, pag, ip); | |
bf904248 DC |
186 | } else if (!igrab(VFS_I(ip))) { |
187 | /* If the VFS inode is being torn down, pause and try again. */ | |
bf904248 DC |
188 | XFS_STATS_INC(xs_ig_frecycle); |
189 | goto out_error; | |
6bfb3d06 DC |
190 | } else if (xfs_iflags_test(ip, XFS_INEW)) { |
191 | /* | |
192 | * We are racing with another cache hit that is | |
193 | * currently recycling this inode out of the XFS_IRECLAIMABLE | |
194 | * state. Wait for the initialisation to complete before | |
195 | * continuing. | |
196 | */ | |
197 | wait_on_inode(VFS_I(ip)); | |
6441e549 | 198 | } |
1da177e4 | 199 | |
6441e549 DC |
200 | if (ip->i_d.di_mode == 0 && !(flags & XFS_IGET_CREATE)) { |
201 | error = ENOENT; | |
6bfb3d06 DC |
202 | iput(VFS_I(ip)); |
203 | goto out_error; | |
6441e549 | 204 | } |
da353b0d | 205 | |
6bfb3d06 DC |
206 | /* We've got a live one. */ |
207 | read_unlock(&pag->pag_ici_lock); | |
208 | ||
6441e549 DC |
209 | if (lock_flags != 0) |
210 | xfs_ilock(ip, lock_flags); | |
da353b0d | 211 | |
6441e549 DC |
212 | xfs_iflags_clear(ip, XFS_ISTALE); |
213 | xfs_itrace_exit_tag(ip, "xfs_iget.found"); | |
214 | XFS_STATS_INC(xs_ig_found); | |
215 | return 0; | |
1da177e4 | 216 | |
6441e549 | 217 | out_error: |
da353b0d | 218 | read_unlock(&pag->pag_ici_lock); |
6441e549 DC |
219 | return error; |
220 | } | |
221 | ||
222 | ||
223 | static int | |
224 | xfs_iget_cache_miss( | |
225 | struct xfs_mount *mp, | |
226 | struct xfs_perag *pag, | |
227 | xfs_trans_t *tp, | |
228 | xfs_ino_t ino, | |
229 | struct xfs_inode **ipp, | |
230 | xfs_daddr_t bno, | |
231 | int flags, | |
232 | int lock_flags) __releases(pag->pag_ici_lock) | |
233 | { | |
234 | struct xfs_inode *ip; | |
235 | int error; | |
236 | unsigned long first_index, mask; | |
237 | xfs_agino_t agino = XFS_INO_TO_AGINO(mp, ino); | |
1da177e4 | 238 | |
24f211ba CH |
239 | ip = xfs_inode_alloc(mp, ino); |
240 | if (!ip) | |
241 | return ENOMEM; | |
242 | ||
243 | error = xfs_iread(mp, tp, ip, bno, flags); | |
6441e549 | 244 | if (error) |
24f211ba | 245 | goto out_destroy; |
1da177e4 | 246 | |
15947f2d | 247 | xfs_itrace_exit_tag(ip, "xfs_iget.alloc"); |
1da177e4 | 248 | |
745b1f47 | 249 | if ((ip->i_d.di_mode == 0) && !(flags & XFS_IGET_CREATE)) { |
6441e549 DC |
250 | error = ENOENT; |
251 | goto out_destroy; | |
1da177e4 LT |
252 | } |
253 | ||
254 | /* | |
bad55843 | 255 | * Preload the radix tree so we can insert safely under the |
56e73ec4 DC |
256 | * write spinlock. Note that we cannot sleep inside the preload |
257 | * region. | |
1da177e4 | 258 | */ |
da353b0d | 259 | if (radix_tree_preload(GFP_KERNEL)) { |
6441e549 | 260 | error = EAGAIN; |
ed93ec39 CH |
261 | goto out_destroy; |
262 | } | |
263 | ||
264 | /* | |
265 | * Because the inode hasn't been added to the radix-tree yet it can't | |
266 | * be found by another thread, so we can do the non-sleeping lock here. | |
267 | */ | |
268 | if (lock_flags) { | |
269 | if (!xfs_ilock_nowait(ip, lock_flags)) | |
270 | BUG(); | |
da353b0d | 271 | } |
f338f903 | 272 | |
da353b0d DC |
273 | mask = ~(((XFS_INODE_CLUSTER_SIZE(mp) >> mp->m_sb.sb_inodelog)) - 1); |
274 | first_index = agino & mask; | |
275 | write_lock(&pag->pag_ici_lock); | |
6441e549 DC |
276 | |
277 | /* insert the new inode */ | |
da353b0d DC |
278 | error = radix_tree_insert(&pag->pag_ici_root, agino, ip); |
279 | if (unlikely(error)) { | |
6441e549 | 280 | WARN_ON(error != -EEXIST); |
da353b0d | 281 | XFS_STATS_INC(xs_ig_dup); |
6441e549 | 282 | error = EAGAIN; |
56e73ec4 | 283 | goto out_preload_end; |
1da177e4 LT |
284 | } |
285 | ||
6441e549 | 286 | /* These values _must_ be set before releasing the radix tree lock! */ |
1da177e4 | 287 | ip->i_udquot = ip->i_gdquot = NULL; |
7a18c386 | 288 | xfs_iflags_set(ip, XFS_INEW); |
1da177e4 | 289 | |
da353b0d DC |
290 | write_unlock(&pag->pag_ici_lock); |
291 | radix_tree_preload_end(); | |
6441e549 DC |
292 | *ipp = ip; |
293 | return 0; | |
294 | ||
56e73ec4 | 295 | out_preload_end: |
6441e549 DC |
296 | write_unlock(&pag->pag_ici_lock); |
297 | radix_tree_preload_end(); | |
56e73ec4 DC |
298 | if (lock_flags) |
299 | xfs_iunlock(ip, lock_flags); | |
6441e549 | 300 | out_destroy: |
9ed0451e | 301 | xfs_destroy_inode(ip); |
6441e549 DC |
302 | return error; |
303 | } | |
304 | ||
305 | /* | |
306 | * Look up an inode by number in the given file system. | |
307 | * The inode is looked up in the cache held in each AG. | |
bf904248 DC |
308 | * If the inode is found in the cache, initialise the vfs inode |
309 | * if necessary. | |
6441e549 DC |
310 | * |
311 | * If it is not in core, read it in from the file system's device, | |
bf904248 | 312 | * add it to the cache and initialise the vfs inode. |
6441e549 DC |
313 | * |
314 | * The inode is locked according to the value of the lock_flags parameter. | |
315 | * This flag parameter indicates how and if the inode's IO lock and inode lock | |
316 | * should be taken. | |
317 | * | |
318 | * mp -- the mount point structure for the current file system. It points | |
319 | * to the inode hash table. | |
320 | * tp -- a pointer to the current transaction if there is one. This is | |
321 | * simply passed through to the xfs_iread() call. | |
322 | * ino -- the number of the inode desired. This is the unique identifier | |
323 | * within the file system for the inode being requested. | |
324 | * lock_flags -- flags indicating how to lock the inode. See the comment | |
325 | * for xfs_ilock() for a list of valid values. | |
326 | * bno -- the block number starting the buffer containing the inode, | |
327 | * if known (as by bulkstat), else 0. | |
328 | */ | |
bf904248 DC |
329 | int |
330 | xfs_iget( | |
6441e549 DC |
331 | xfs_mount_t *mp, |
332 | xfs_trans_t *tp, | |
333 | xfs_ino_t ino, | |
334 | uint flags, | |
335 | uint lock_flags, | |
336 | xfs_inode_t **ipp, | |
337 | xfs_daddr_t bno) | |
338 | { | |
339 | xfs_inode_t *ip; | |
340 | int error; | |
341 | xfs_perag_t *pag; | |
342 | xfs_agino_t agino; | |
343 | ||
344 | /* the radix tree exists only in inode capable AGs */ | |
345 | if (XFS_INO_TO_AGNO(mp, ino) >= mp->m_maxagi) | |
346 | return EINVAL; | |
347 | ||
348 | /* get the perag structure and ensure that it's inode capable */ | |
349 | pag = xfs_get_perag(mp, ino); | |
350 | if (!pag->pagi_inodeok) | |
351 | return EINVAL; | |
352 | ASSERT(pag->pag_ici_init); | |
353 | agino = XFS_INO_TO_AGINO(mp, ino); | |
354 | ||
355 | again: | |
356 | error = 0; | |
357 | read_lock(&pag->pag_ici_lock); | |
358 | ip = radix_tree_lookup(&pag->pag_ici_root, agino); | |
359 | ||
360 | if (ip) { | |
bf904248 | 361 | error = xfs_iget_cache_hit(pag, ip, flags, lock_flags); |
6441e549 DC |
362 | if (error) |
363 | goto out_error_or_again; | |
364 | } else { | |
365 | read_unlock(&pag->pag_ici_lock); | |
366 | XFS_STATS_INC(xs_ig_missed); | |
367 | ||
368 | error = xfs_iget_cache_miss(mp, pag, tp, ino, &ip, bno, | |
369 | flags, lock_flags); | |
370 | if (error) | |
371 | goto out_error_or_again; | |
372 | } | |
da353b0d | 373 | xfs_put_perag(mp, pag); |
1da177e4 | 374 | |
1da177e4 LT |
375 | *ipp = ip; |
376 | ||
bf904248 DC |
377 | ASSERT(ip->i_df.if_ext_max == |
378 | XFS_IFORK_DSIZE(ip) / sizeof(xfs_bmbt_rec_t)); | |
1da177e4 LT |
379 | /* |
380 | * If we have a real type for an on-disk inode, we can set ops(&unlock) | |
381 | * now. If it's a new inode being created, xfs_ialloc will handle it. | |
382 | */ | |
bf904248 | 383 | if (xfs_iflags_test(ip, XFS_INEW) && ip->i_d.di_mode != 0) |
41be8bed | 384 | xfs_setup_inode(ip); |
1da177e4 | 385 | return 0; |
6441e549 DC |
386 | |
387 | out_error_or_again: | |
388 | if (error == EAGAIN) { | |
389 | delay(1); | |
390 | goto again; | |
391 | } | |
392 | xfs_put_perag(mp, pag); | |
393 | return error; | |
1da177e4 LT |
394 | } |
395 | ||
396 | ||
1da177e4 LT |
397 | /* |
398 | * Look for the inode corresponding to the given ino in the hash table. | |
399 | * If it is there and its i_transp pointer matches tp, return it. | |
400 | * Otherwise, return NULL. | |
401 | */ | |
402 | xfs_inode_t * | |
403 | xfs_inode_incore(xfs_mount_t *mp, | |
404 | xfs_ino_t ino, | |
405 | xfs_trans_t *tp) | |
406 | { | |
1da177e4 | 407 | xfs_inode_t *ip; |
da353b0d DC |
408 | xfs_perag_t *pag; |
409 | ||
410 | pag = xfs_get_perag(mp, ino); | |
411 | read_lock(&pag->pag_ici_lock); | |
412 | ip = radix_tree_lookup(&pag->pag_ici_root, XFS_INO_TO_AGINO(mp, ino)); | |
413 | read_unlock(&pag->pag_ici_lock); | |
414 | xfs_put_perag(mp, pag); | |
415 | ||
416 | /* the returned inode must match the transaction */ | |
417 | if (ip && (ip->i_transp != tp)) | |
418 | return NULL; | |
419 | return ip; | |
1da177e4 LT |
420 | } |
421 | ||
422 | /* | |
423 | * Decrement reference count of an inode structure and unlock it. | |
424 | * | |
425 | * ip -- the inode being released | |
426 | * lock_flags -- this parameter indicates the inode's locks to be | |
427 | * to be released. See the comment on xfs_iunlock() for a list | |
428 | * of valid values. | |
429 | */ | |
430 | void | |
431 | xfs_iput(xfs_inode_t *ip, | |
432 | uint lock_flags) | |
433 | { | |
cf441eeb | 434 | xfs_itrace_entry(ip); |
1da177e4 | 435 | xfs_iunlock(ip, lock_flags); |
10090be2 | 436 | IRELE(ip); |
1da177e4 LT |
437 | } |
438 | ||
439 | /* | |
440 | * Special iput for brand-new inodes that are still locked | |
441 | */ | |
442 | void | |
01651646 DC |
443 | xfs_iput_new( |
444 | xfs_inode_t *ip, | |
445 | uint lock_flags) | |
1da177e4 | 446 | { |
01651646 | 447 | struct inode *inode = VFS_I(ip); |
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 | ||
1da177e4 | 462 | /* |
5cafdeb2 CH |
463 | * This is called free all the memory associated with an inode. |
464 | * It must free the inode itself and any buffers allocated for | |
465 | * if_extents/if_data and if_broot. It must also free the lock | |
466 | * associated with the inode. | |
467 | * | |
468 | * Note: because we don't initialise everything on reallocation out | |
469 | * of the zone, we must ensure we nullify everything correctly before | |
470 | * freeing the structure. | |
1da177e4 LT |
471 | */ |
472 | void | |
5cafdeb2 CH |
473 | xfs_ireclaim( |
474 | struct xfs_inode *ip) | |
1da177e4 | 475 | { |
5cafdeb2 CH |
476 | struct xfs_mount *mp = ip->i_mount; |
477 | struct xfs_perag *pag; | |
1da177e4 | 478 | |
5cafdeb2 | 479 | XFS_STATS_INC(xs_ig_reclaims); |
1da177e4 LT |
480 | |
481 | /* | |
5cafdeb2 CH |
482 | * Remove the inode from the per-AG radix tree. It doesn't matter |
483 | * if it was never added to it because radix_tree_delete can deal | |
484 | * with that case just fine. | |
1da177e4 | 485 | */ |
5cafdeb2 CH |
486 | pag = xfs_get_perag(mp, ip->i_ino); |
487 | write_lock(&pag->pag_ici_lock); | |
488 | radix_tree_delete(&pag->pag_ici_root, XFS_INO_TO_AGINO(mp, ip->i_ino)); | |
489 | write_unlock(&pag->pag_ici_lock); | |
490 | xfs_put_perag(mp, pag); | |
1da177e4 LT |
491 | |
492 | /* | |
5cafdeb2 CH |
493 | * Here we do an (almost) spurious inode lock in order to coordinate |
494 | * with inode cache radix tree lookups. This is because the lookup | |
495 | * can reference the inodes in the cache without taking references. | |
496 | * | |
497 | * We make that OK here by ensuring that we wait until the inode is | |
498 | * unlocked after the lookup before we go ahead and free it. We get | |
499 | * both the ilock and the iolock because the code may need to drop the | |
500 | * ilock one but will still hold the iolock. | |
1da177e4 | 501 | */ |
5cafdeb2 | 502 | xfs_ilock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL); |
1da177e4 | 503 | /* |
5cafdeb2 | 504 | * Release dquots (and their references) if any. |
1da177e4 | 505 | */ |
5cafdeb2 | 506 | XFS_QM_DQDETACH(ip->i_mount, ip); |
439b8434 | 507 | xfs_iunlock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL); |
1da177e4 | 508 | |
5cafdeb2 CH |
509 | switch (ip->i_d.di_mode & S_IFMT) { |
510 | case S_IFREG: | |
511 | case S_IFDIR: | |
512 | case S_IFLNK: | |
513 | xfs_idestroy_fork(ip, XFS_DATA_FORK); | |
514 | break; | |
515 | } | |
da353b0d | 516 | |
5cafdeb2 CH |
517 | if (ip->i_afp) |
518 | xfs_idestroy_fork(ip, XFS_ATTR_FORK); | |
1da177e4 | 519 | |
5cafdeb2 CH |
520 | #ifdef XFS_INODE_TRACE |
521 | ktrace_free(ip->i_trace); | |
522 | #endif | |
523 | #ifdef XFS_BMAP_TRACE | |
524 | ktrace_free(ip->i_xtrace); | |
525 | #endif | |
526 | #ifdef XFS_BTREE_TRACE | |
527 | ktrace_free(ip->i_btrace); | |
528 | #endif | |
529 | #ifdef XFS_RW_TRACE | |
530 | ktrace_free(ip->i_rwtrace); | |
531 | #endif | |
532 | #ifdef XFS_ILOCK_TRACE | |
533 | ktrace_free(ip->i_lock_trace); | |
534 | #endif | |
535 | #ifdef XFS_DIR2_TRACE | |
536 | ktrace_free(ip->i_dir_trace); | |
537 | #endif | |
538 | if (ip->i_itemp) { | |
539 | /* | |
540 | * Only if we are shutting down the fs will we see an | |
541 | * inode still in the AIL. If it is there, we should remove | |
542 | * it to prevent a use-after-free from occurring. | |
543 | */ | |
544 | xfs_log_item_t *lip = &ip->i_itemp->ili_item; | |
545 | struct xfs_ail *ailp = lip->li_ailp; | |
546 | ||
547 | ASSERT(((lip->li_flags & XFS_LI_IN_AIL) == 0) || | |
548 | XFS_FORCED_SHUTDOWN(ip->i_mount)); | |
549 | if (lip->li_flags & XFS_LI_IN_AIL) { | |
550 | spin_lock(&ailp->xa_lock); | |
551 | if (lip->li_flags & XFS_LI_IN_AIL) | |
552 | xfs_trans_ail_delete(ailp, lip); | |
553 | else | |
554 | spin_unlock(&ailp->xa_lock); | |
555 | } | |
556 | xfs_inode_item_destroy(ip); | |
557 | ip->i_itemp = NULL; | |
558 | } | |
559 | /* asserts to verify all state is correct here */ | |
560 | ASSERT(atomic_read(&ip->i_iocount) == 0); | |
561 | ASSERT(atomic_read(&ip->i_pincount) == 0); | |
562 | ASSERT(!spin_is_locked(&ip->i_flags_lock)); | |
563 | ASSERT(completion_done(&ip->i_flush)); | |
564 | kmem_zone_free(xfs_inode_zone, ip); | |
1da177e4 LT |
565 | } |
566 | ||
567 | /* | |
568 | * This is a wrapper routine around the xfs_ilock() routine | |
569 | * used to centralize some grungy code. It is used in places | |
570 | * that wish to lock the inode solely for reading the extents. | |
571 | * The reason these places can't just call xfs_ilock(SHARED) | |
572 | * is that the inode lock also guards to bringing in of the | |
573 | * extents from disk for a file in b-tree format. If the inode | |
574 | * is in b-tree format, then we need to lock the inode exclusively | |
575 | * until the extents are read in. Locking it exclusively all | |
576 | * the time would limit our parallelism unnecessarily, though. | |
577 | * What we do instead is check to see if the extents have been | |
578 | * read in yet, and only lock the inode exclusively if they | |
579 | * have not. | |
580 | * | |
581 | * The function returns a value which should be given to the | |
582 | * corresponding xfs_iunlock_map_shared(). This value is | |
583 | * the mode in which the lock was actually taken. | |
584 | */ | |
585 | uint | |
586 | xfs_ilock_map_shared( | |
587 | xfs_inode_t *ip) | |
588 | { | |
589 | uint lock_mode; | |
590 | ||
591 | if ((ip->i_d.di_format == XFS_DINODE_FMT_BTREE) && | |
592 | ((ip->i_df.if_flags & XFS_IFEXTENTS) == 0)) { | |
593 | lock_mode = XFS_ILOCK_EXCL; | |
594 | } else { | |
595 | lock_mode = XFS_ILOCK_SHARED; | |
596 | } | |
597 | ||
598 | xfs_ilock(ip, lock_mode); | |
599 | ||
600 | return lock_mode; | |
601 | } | |
602 | ||
603 | /* | |
604 | * This is simply the unlock routine to go with xfs_ilock_map_shared(). | |
605 | * All it does is call xfs_iunlock() with the given lock_mode. | |
606 | */ | |
607 | void | |
608 | xfs_iunlock_map_shared( | |
609 | xfs_inode_t *ip, | |
610 | unsigned int lock_mode) | |
611 | { | |
612 | xfs_iunlock(ip, lock_mode); | |
613 | } | |
614 | ||
615 | /* | |
616 | * The xfs inode contains 2 locks: a multi-reader lock called the | |
617 | * i_iolock and a multi-reader lock called the i_lock. This routine | |
618 | * allows either or both of the locks to be obtained. | |
619 | * | |
620 | * The 2 locks should always be ordered so that the IO lock is | |
621 | * obtained first in order to prevent deadlock. | |
622 | * | |
623 | * ip -- the inode being locked | |
624 | * lock_flags -- this parameter indicates the inode's locks | |
625 | * to be locked. It can be: | |
626 | * XFS_IOLOCK_SHARED, | |
627 | * XFS_IOLOCK_EXCL, | |
628 | * XFS_ILOCK_SHARED, | |
629 | * XFS_ILOCK_EXCL, | |
630 | * XFS_IOLOCK_SHARED | XFS_ILOCK_SHARED, | |
631 | * XFS_IOLOCK_SHARED | XFS_ILOCK_EXCL, | |
632 | * XFS_IOLOCK_EXCL | XFS_ILOCK_SHARED, | |
633 | * XFS_IOLOCK_EXCL | XFS_ILOCK_EXCL | |
634 | */ | |
635 | void | |
579aa9ca CH |
636 | xfs_ilock( |
637 | xfs_inode_t *ip, | |
638 | uint lock_flags) | |
1da177e4 LT |
639 | { |
640 | /* | |
641 | * You can't set both SHARED and EXCL for the same lock, | |
642 | * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED, | |
643 | * and XFS_ILOCK_EXCL are valid values to set in lock_flags. | |
644 | */ | |
645 | ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) != | |
646 | (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)); | |
647 | ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) != | |
648 | (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)); | |
f7c66ce3 | 649 | ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_DEP_MASK)) == 0); |
1da177e4 | 650 | |
579aa9ca | 651 | if (lock_flags & XFS_IOLOCK_EXCL) |
f7c66ce3 | 652 | mrupdate_nested(&ip->i_iolock, XFS_IOLOCK_DEP(lock_flags)); |
579aa9ca | 653 | else if (lock_flags & XFS_IOLOCK_SHARED) |
f7c66ce3 | 654 | mraccess_nested(&ip->i_iolock, XFS_IOLOCK_DEP(lock_flags)); |
579aa9ca CH |
655 | |
656 | if (lock_flags & XFS_ILOCK_EXCL) | |
f7c66ce3 | 657 | mrupdate_nested(&ip->i_lock, XFS_ILOCK_DEP(lock_flags)); |
579aa9ca | 658 | else if (lock_flags & XFS_ILOCK_SHARED) |
f7c66ce3 | 659 | mraccess_nested(&ip->i_lock, XFS_ILOCK_DEP(lock_flags)); |
579aa9ca | 660 | |
1da177e4 LT |
661 | xfs_ilock_trace(ip, 1, lock_flags, (inst_t *)__return_address); |
662 | } | |
663 | ||
664 | /* | |
665 | * This is just like xfs_ilock(), except that the caller | |
666 | * is guaranteed not to sleep. It returns 1 if it gets | |
667 | * the requested locks and 0 otherwise. If the IO lock is | |
668 | * obtained but the inode lock cannot be, then the IO lock | |
669 | * is dropped before returning. | |
670 | * | |
671 | * ip -- the inode being locked | |
672 | * lock_flags -- this parameter indicates the inode's locks to be | |
673 | * to be locked. See the comment for xfs_ilock() for a list | |
674 | * of valid values. | |
1da177e4 LT |
675 | */ |
676 | int | |
579aa9ca CH |
677 | xfs_ilock_nowait( |
678 | xfs_inode_t *ip, | |
679 | uint lock_flags) | |
1da177e4 | 680 | { |
1da177e4 LT |
681 | /* |
682 | * You can't set both SHARED and EXCL for the same lock, | |
683 | * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED, | |
684 | * and XFS_ILOCK_EXCL are valid values to set in lock_flags. | |
685 | */ | |
686 | ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) != | |
687 | (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)); | |
688 | ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) != | |
689 | (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)); | |
f7c66ce3 | 690 | ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_LOCK_DEP_MASK)) == 0); |
1da177e4 | 691 | |
1da177e4 | 692 | if (lock_flags & XFS_IOLOCK_EXCL) { |
579aa9ca CH |
693 | if (!mrtryupdate(&ip->i_iolock)) |
694 | goto out; | |
1da177e4 | 695 | } else if (lock_flags & XFS_IOLOCK_SHARED) { |
579aa9ca CH |
696 | if (!mrtryaccess(&ip->i_iolock)) |
697 | goto out; | |
1da177e4 LT |
698 | } |
699 | if (lock_flags & XFS_ILOCK_EXCL) { | |
579aa9ca CH |
700 | if (!mrtryupdate(&ip->i_lock)) |
701 | goto out_undo_iolock; | |
1da177e4 | 702 | } else if (lock_flags & XFS_ILOCK_SHARED) { |
579aa9ca CH |
703 | if (!mrtryaccess(&ip->i_lock)) |
704 | goto out_undo_iolock; | |
1da177e4 LT |
705 | } |
706 | xfs_ilock_trace(ip, 2, lock_flags, (inst_t *)__return_address); | |
707 | return 1; | |
579aa9ca CH |
708 | |
709 | out_undo_iolock: | |
710 | if (lock_flags & XFS_IOLOCK_EXCL) | |
711 | mrunlock_excl(&ip->i_iolock); | |
712 | else if (lock_flags & XFS_IOLOCK_SHARED) | |
713 | mrunlock_shared(&ip->i_iolock); | |
714 | out: | |
715 | return 0; | |
1da177e4 LT |
716 | } |
717 | ||
718 | /* | |
719 | * xfs_iunlock() is used to drop the inode locks acquired with | |
720 | * xfs_ilock() and xfs_ilock_nowait(). The caller must pass | |
721 | * in the flags given to xfs_ilock() or xfs_ilock_nowait() so | |
722 | * that we know which locks to drop. | |
723 | * | |
724 | * ip -- the inode being unlocked | |
725 | * lock_flags -- this parameter indicates the inode's locks to be | |
726 | * to be unlocked. See the comment for xfs_ilock() for a list | |
727 | * of valid values for this parameter. | |
728 | * | |
729 | */ | |
730 | void | |
579aa9ca CH |
731 | xfs_iunlock( |
732 | xfs_inode_t *ip, | |
733 | uint lock_flags) | |
1da177e4 LT |
734 | { |
735 | /* | |
736 | * You can't set both SHARED and EXCL for the same lock, | |
737 | * and only XFS_IOLOCK_SHARED, XFS_IOLOCK_EXCL, XFS_ILOCK_SHARED, | |
738 | * and XFS_ILOCK_EXCL are valid values to set in lock_flags. | |
739 | */ | |
740 | ASSERT((lock_flags & (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)) != | |
741 | (XFS_IOLOCK_SHARED | XFS_IOLOCK_EXCL)); | |
742 | ASSERT((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) != | |
743 | (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)); | |
f7c66ce3 LM |
744 | ASSERT((lock_flags & ~(XFS_LOCK_MASK | XFS_IUNLOCK_NONOTIFY | |
745 | XFS_LOCK_DEP_MASK)) == 0); | |
1da177e4 LT |
746 | ASSERT(lock_flags != 0); |
747 | ||
579aa9ca CH |
748 | if (lock_flags & XFS_IOLOCK_EXCL) |
749 | mrunlock_excl(&ip->i_iolock); | |
750 | else if (lock_flags & XFS_IOLOCK_SHARED) | |
751 | mrunlock_shared(&ip->i_iolock); | |
1da177e4 | 752 | |
579aa9ca CH |
753 | if (lock_flags & XFS_ILOCK_EXCL) |
754 | mrunlock_excl(&ip->i_lock); | |
755 | else if (lock_flags & XFS_ILOCK_SHARED) | |
756 | mrunlock_shared(&ip->i_lock); | |
1da177e4 | 757 | |
579aa9ca CH |
758 | if ((lock_flags & (XFS_ILOCK_SHARED | XFS_ILOCK_EXCL)) && |
759 | !(lock_flags & XFS_IUNLOCK_NONOTIFY) && ip->i_itemp) { | |
1da177e4 LT |
760 | /* |
761 | * Let the AIL know that this item has been unlocked in case | |
762 | * it is in the AIL and anyone is waiting on it. Don't do | |
763 | * this if the caller has asked us not to. | |
764 | */ | |
783a2f65 | 765 | xfs_trans_unlocked_item(ip->i_itemp->ili_item.li_ailp, |
579aa9ca | 766 | (xfs_log_item_t*)(ip->i_itemp)); |
1da177e4 LT |
767 | } |
768 | xfs_ilock_trace(ip, 3, lock_flags, (inst_t *)__return_address); | |
769 | } | |
770 | ||
771 | /* | |
772 | * give up write locks. the i/o lock cannot be held nested | |
773 | * if it is being demoted. | |
774 | */ | |
775 | void | |
579aa9ca CH |
776 | xfs_ilock_demote( |
777 | xfs_inode_t *ip, | |
778 | uint lock_flags) | |
1da177e4 LT |
779 | { |
780 | ASSERT(lock_flags & (XFS_IOLOCK_EXCL|XFS_ILOCK_EXCL)); | |
781 | ASSERT((lock_flags & ~(XFS_IOLOCK_EXCL|XFS_ILOCK_EXCL)) == 0); | |
782 | ||
579aa9ca | 783 | if (lock_flags & XFS_ILOCK_EXCL) |
1da177e4 | 784 | mrdemote(&ip->i_lock); |
579aa9ca | 785 | if (lock_flags & XFS_IOLOCK_EXCL) |
1da177e4 | 786 | mrdemote(&ip->i_iolock); |
579aa9ca CH |
787 | } |
788 | ||
789 | #ifdef DEBUG | |
790 | /* | |
791 | * Debug-only routine, without additional rw_semaphore APIs, we can | |
792 | * now only answer requests regarding whether we hold the lock for write | |
793 | * (reader state is outside our visibility, we only track writer state). | |
794 | * | |
795 | * Note: this means !xfs_isilocked would give false positives, so don't do that. | |
796 | */ | |
797 | int | |
798 | xfs_isilocked( | |
799 | xfs_inode_t *ip, | |
800 | uint lock_flags) | |
801 | { | |
802 | if ((lock_flags & (XFS_ILOCK_EXCL|XFS_ILOCK_SHARED)) == | |
803 | XFS_ILOCK_EXCL) { | |
804 | if (!ip->i_lock.mr_writer) | |
805 | return 0; | |
1da177e4 | 806 | } |
579aa9ca CH |
807 | |
808 | if ((lock_flags & (XFS_IOLOCK_EXCL|XFS_IOLOCK_SHARED)) == | |
809 | XFS_IOLOCK_EXCL) { | |
810 | if (!ip->i_iolock.mr_writer) | |
811 | return 0; | |
812 | } | |
813 | ||
814 | return 1; | |
1da177e4 | 815 | } |
579aa9ca | 816 | #endif |
1da177e4 | 817 | |
5a8d0f3c CH |
818 | #ifdef XFS_INODE_TRACE |
819 | ||
820 | #define KTRACE_ENTER(ip, vk, s, line, ra) \ | |
821 | ktrace_enter((ip)->i_trace, \ | |
822 | /* 0 */ (void *)(__psint_t)(vk), \ | |
823 | /* 1 */ (void *)(s), \ | |
824 | /* 2 */ (void *)(__psint_t) line, \ | |
825 | /* 3 */ (void *)(__psint_t)atomic_read(&VFS_I(ip)->i_count), \ | |
826 | /* 4 */ (void *)(ra), \ | |
827 | /* 5 */ NULL, \ | |
828 | /* 6 */ (void *)(__psint_t)current_cpu(), \ | |
829 | /* 7 */ (void *)(__psint_t)current_pid(), \ | |
830 | /* 8 */ (void *)__return_address, \ | |
831 | /* 9 */ NULL, NULL, NULL, NULL, NULL, NULL, NULL) | |
832 | ||
833 | /* | |
834 | * Vnode tracing code. | |
835 | */ | |
836 | void | |
837 | _xfs_itrace_entry(xfs_inode_t *ip, const char *func, inst_t *ra) | |
838 | { | |
839 | KTRACE_ENTER(ip, INODE_KTRACE_ENTRY, func, 0, ra); | |
840 | } | |
841 | ||
842 | void | |
843 | _xfs_itrace_exit(xfs_inode_t *ip, const char *func, inst_t *ra) | |
844 | { | |
845 | KTRACE_ENTER(ip, INODE_KTRACE_EXIT, func, 0, ra); | |
846 | } | |
847 | ||
848 | void | |
849 | xfs_itrace_hold(xfs_inode_t *ip, char *file, int line, inst_t *ra) | |
850 | { | |
851 | KTRACE_ENTER(ip, INODE_KTRACE_HOLD, file, line, ra); | |
852 | } | |
853 | ||
854 | void | |
855 | _xfs_itrace_ref(xfs_inode_t *ip, char *file, int line, inst_t *ra) | |
856 | { | |
857 | KTRACE_ENTER(ip, INODE_KTRACE_REF, file, line, ra); | |
858 | } | |
859 | ||
860 | void | |
861 | xfs_itrace_rele(xfs_inode_t *ip, char *file, int line, inst_t *ra) | |
862 | { | |
863 | KTRACE_ENTER(ip, INODE_KTRACE_RELE, file, line, ra); | |
864 | } | |
865 | #endif /* XFS_INODE_TRACE */ |