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6413a014 DW |
1 | /* |
2 | * Copyright (C) 2016 Oracle. All Rights Reserved. | |
3 | * | |
4 | * Author: Darrick J. Wong <darrick.wong@oracle.com> | |
5 | * | |
6 | * This program is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU General Public License | |
8 | * as published by the Free Software Foundation; either version 2 | |
9 | * of the License, or (at your option) any later version. | |
10 | * | |
11 | * This program is distributed in the hope that it would be useful, | |
12 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
13 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
14 | * GNU General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU General Public License | |
17 | * along with this program; if not, write the Free Software Foundation, | |
18 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA. | |
19 | */ | |
20 | #include "xfs.h" | |
21 | #include "xfs_fs.h" | |
22 | #include "xfs_format.h" | |
23 | #include "xfs_log_format.h" | |
24 | #include "xfs_trans_resv.h" | |
77d61fe4 | 25 | #include "xfs_bit.h" |
6413a014 | 26 | #include "xfs_mount.h" |
77d61fe4 DW |
27 | #include "xfs_defer.h" |
28 | #include "xfs_inode.h" | |
6413a014 DW |
29 | #include "xfs_trans.h" |
30 | #include "xfs_trans_priv.h" | |
31 | #include "xfs_buf_item.h" | |
32 | #include "xfs_bmap_item.h" | |
33 | #include "xfs_log.h" | |
77d61fe4 DW |
34 | #include "xfs_bmap.h" |
35 | #include "xfs_icache.h" | |
36 | #include "xfs_trace.h" | |
fe0be23e DW |
37 | #include "xfs_bmap_btree.h" |
38 | #include "xfs_trans_space.h" | |
6413a014 DW |
39 | |
40 | ||
41 | kmem_zone_t *xfs_bui_zone; | |
42 | kmem_zone_t *xfs_bud_zone; | |
43 | ||
44 | static inline struct xfs_bui_log_item *BUI_ITEM(struct xfs_log_item *lip) | |
45 | { | |
46 | return container_of(lip, struct xfs_bui_log_item, bui_item); | |
47 | } | |
48 | ||
49 | void | |
50 | xfs_bui_item_free( | |
51 | struct xfs_bui_log_item *buip) | |
52 | { | |
53 | kmem_zone_free(xfs_bui_zone, buip); | |
54 | } | |
55 | ||
0612d116 DC |
56 | /* |
57 | * Freeing the BUI requires that we remove it from the AIL if it has already | |
58 | * been placed there. However, the BUI may not yet have been placed in the AIL | |
59 | * when called by xfs_bui_release() from BUD processing due to the ordering of | |
60 | * committed vs unpin operations in bulk insert operations. Hence the reference | |
61 | * count to ensure only the last caller frees the BUI. | |
62 | */ | |
63 | void | |
64 | xfs_bui_release( | |
65 | struct xfs_bui_log_item *buip) | |
66 | { | |
67 | ASSERT(atomic_read(&buip->bui_refcount) > 0); | |
68 | if (atomic_dec_and_test(&buip->bui_refcount)) { | |
69 | xfs_trans_ail_remove(&buip->bui_item, SHUTDOWN_LOG_IO_ERROR); | |
70 | xfs_bui_item_free(buip); | |
71 | } | |
72 | } | |
73 | ||
74 | ||
6413a014 DW |
75 | STATIC void |
76 | xfs_bui_item_size( | |
77 | struct xfs_log_item *lip, | |
78 | int *nvecs, | |
79 | int *nbytes) | |
80 | { | |
81 | struct xfs_bui_log_item *buip = BUI_ITEM(lip); | |
82 | ||
83 | *nvecs += 1; | |
84 | *nbytes += xfs_bui_log_format_sizeof(buip->bui_format.bui_nextents); | |
85 | } | |
86 | ||
87 | /* | |
88 | * This is called to fill in the vector of log iovecs for the | |
89 | * given bui log item. We use only 1 iovec, and we point that | |
90 | * at the bui_log_format structure embedded in the bui item. | |
91 | * It is at this point that we assert that all of the extent | |
92 | * slots in the bui item have been filled. | |
93 | */ | |
94 | STATIC void | |
95 | xfs_bui_item_format( | |
96 | struct xfs_log_item *lip, | |
97 | struct xfs_log_vec *lv) | |
98 | { | |
99 | struct xfs_bui_log_item *buip = BUI_ITEM(lip); | |
100 | struct xfs_log_iovec *vecp = NULL; | |
101 | ||
102 | ASSERT(atomic_read(&buip->bui_next_extent) == | |
103 | buip->bui_format.bui_nextents); | |
104 | ||
105 | buip->bui_format.bui_type = XFS_LI_BUI; | |
106 | buip->bui_format.bui_size = 1; | |
107 | ||
108 | xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_BUI_FORMAT, &buip->bui_format, | |
109 | xfs_bui_log_format_sizeof(buip->bui_format.bui_nextents)); | |
110 | } | |
111 | ||
112 | /* | |
113 | * Pinning has no meaning for an bui item, so just return. | |
114 | */ | |
115 | STATIC void | |
116 | xfs_bui_item_pin( | |
117 | struct xfs_log_item *lip) | |
118 | { | |
119 | } | |
120 | ||
121 | /* | |
122 | * The unpin operation is the last place an BUI is manipulated in the log. It is | |
123 | * either inserted in the AIL or aborted in the event of a log I/O error. In | |
124 | * either case, the BUI transaction has been successfully committed to make it | |
125 | * this far. Therefore, we expect whoever committed the BUI to either construct | |
126 | * and commit the BUD or drop the BUD's reference in the event of error. Simply | |
127 | * drop the log's BUI reference now that the log is done with it. | |
128 | */ | |
129 | STATIC void | |
130 | xfs_bui_item_unpin( | |
131 | struct xfs_log_item *lip, | |
132 | int remove) | |
133 | { | |
134 | struct xfs_bui_log_item *buip = BUI_ITEM(lip); | |
135 | ||
136 | xfs_bui_release(buip); | |
137 | } | |
138 | ||
139 | /* | |
140 | * BUI items have no locking or pushing. However, since BUIs are pulled from | |
141 | * the AIL when their corresponding BUDs are committed to disk, their situation | |
142 | * is very similar to being pinned. Return XFS_ITEM_PINNED so that the caller | |
143 | * will eventually flush the log. This should help in getting the BUI out of | |
144 | * the AIL. | |
145 | */ | |
146 | STATIC uint | |
147 | xfs_bui_item_push( | |
148 | struct xfs_log_item *lip, | |
149 | struct list_head *buffer_list) | |
150 | { | |
151 | return XFS_ITEM_PINNED; | |
152 | } | |
153 | ||
154 | /* | |
155 | * The BUI has been either committed or aborted if the transaction has been | |
156 | * cancelled. If the transaction was cancelled, an BUD isn't going to be | |
157 | * constructed and thus we free the BUI here directly. | |
158 | */ | |
159 | STATIC void | |
160 | xfs_bui_item_unlock( | |
161 | struct xfs_log_item *lip) | |
162 | { | |
163 | if (lip->li_flags & XFS_LI_ABORTED) | |
0612d116 | 164 | xfs_bui_release(BUI_ITEM(lip)); |
6413a014 DW |
165 | } |
166 | ||
167 | /* | |
168 | * The BUI is logged only once and cannot be moved in the log, so simply return | |
169 | * the lsn at which it's been logged. | |
170 | */ | |
171 | STATIC xfs_lsn_t | |
172 | xfs_bui_item_committed( | |
173 | struct xfs_log_item *lip, | |
174 | xfs_lsn_t lsn) | |
175 | { | |
176 | return lsn; | |
177 | } | |
178 | ||
179 | /* | |
180 | * The BUI dependency tracking op doesn't do squat. It can't because | |
181 | * it doesn't know where the free extent is coming from. The dependency | |
182 | * tracking has to be handled by the "enclosing" metadata object. For | |
183 | * example, for inodes, the inode is locked throughout the extent freeing | |
184 | * so the dependency should be recorded there. | |
185 | */ | |
186 | STATIC void | |
187 | xfs_bui_item_committing( | |
188 | struct xfs_log_item *lip, | |
189 | xfs_lsn_t lsn) | |
190 | { | |
191 | } | |
192 | ||
193 | /* | |
194 | * This is the ops vector shared by all bui log items. | |
195 | */ | |
196 | static const struct xfs_item_ops xfs_bui_item_ops = { | |
197 | .iop_size = xfs_bui_item_size, | |
198 | .iop_format = xfs_bui_item_format, | |
199 | .iop_pin = xfs_bui_item_pin, | |
200 | .iop_unpin = xfs_bui_item_unpin, | |
201 | .iop_unlock = xfs_bui_item_unlock, | |
202 | .iop_committed = xfs_bui_item_committed, | |
203 | .iop_push = xfs_bui_item_push, | |
204 | .iop_committing = xfs_bui_item_committing, | |
205 | }; | |
206 | ||
207 | /* | |
208 | * Allocate and initialize an bui item with the given number of extents. | |
209 | */ | |
210 | struct xfs_bui_log_item * | |
211 | xfs_bui_init( | |
212 | struct xfs_mount *mp) | |
213 | ||
214 | { | |
215 | struct xfs_bui_log_item *buip; | |
216 | ||
217 | buip = kmem_zone_zalloc(xfs_bui_zone, KM_SLEEP); | |
218 | ||
219 | xfs_log_item_init(mp, &buip->bui_item, XFS_LI_BUI, &xfs_bui_item_ops); | |
220 | buip->bui_format.bui_nextents = XFS_BUI_MAX_FAST_EXTENTS; | |
221 | buip->bui_format.bui_id = (uintptr_t)(void *)buip; | |
222 | atomic_set(&buip->bui_next_extent, 0); | |
223 | atomic_set(&buip->bui_refcount, 2); | |
224 | ||
225 | return buip; | |
226 | } | |
227 | ||
6413a014 DW |
228 | static inline struct xfs_bud_log_item *BUD_ITEM(struct xfs_log_item *lip) |
229 | { | |
230 | return container_of(lip, struct xfs_bud_log_item, bud_item); | |
231 | } | |
232 | ||
233 | STATIC void | |
234 | xfs_bud_item_size( | |
235 | struct xfs_log_item *lip, | |
236 | int *nvecs, | |
237 | int *nbytes) | |
238 | { | |
239 | *nvecs += 1; | |
240 | *nbytes += sizeof(struct xfs_bud_log_format); | |
241 | } | |
242 | ||
243 | /* | |
244 | * This is called to fill in the vector of log iovecs for the | |
245 | * given bud log item. We use only 1 iovec, and we point that | |
246 | * at the bud_log_format structure embedded in the bud item. | |
247 | * It is at this point that we assert that all of the extent | |
248 | * slots in the bud item have been filled. | |
249 | */ | |
250 | STATIC void | |
251 | xfs_bud_item_format( | |
252 | struct xfs_log_item *lip, | |
253 | struct xfs_log_vec *lv) | |
254 | { | |
255 | struct xfs_bud_log_item *budp = BUD_ITEM(lip); | |
256 | struct xfs_log_iovec *vecp = NULL; | |
257 | ||
258 | budp->bud_format.bud_type = XFS_LI_BUD; | |
259 | budp->bud_format.bud_size = 1; | |
260 | ||
261 | xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_BUD_FORMAT, &budp->bud_format, | |
262 | sizeof(struct xfs_bud_log_format)); | |
263 | } | |
264 | ||
265 | /* | |
266 | * Pinning has no meaning for an bud item, so just return. | |
267 | */ | |
268 | STATIC void | |
269 | xfs_bud_item_pin( | |
270 | struct xfs_log_item *lip) | |
271 | { | |
272 | } | |
273 | ||
274 | /* | |
275 | * Since pinning has no meaning for an bud item, unpinning does | |
276 | * not either. | |
277 | */ | |
278 | STATIC void | |
279 | xfs_bud_item_unpin( | |
280 | struct xfs_log_item *lip, | |
281 | int remove) | |
282 | { | |
283 | } | |
284 | ||
285 | /* | |
286 | * There isn't much you can do to push on an bud item. It is simply stuck | |
287 | * waiting for the log to be flushed to disk. | |
288 | */ | |
289 | STATIC uint | |
290 | xfs_bud_item_push( | |
291 | struct xfs_log_item *lip, | |
292 | struct list_head *buffer_list) | |
293 | { | |
294 | return XFS_ITEM_PINNED; | |
295 | } | |
296 | ||
297 | /* | |
298 | * The BUD is either committed or aborted if the transaction is cancelled. If | |
299 | * the transaction is cancelled, drop our reference to the BUI and free the | |
300 | * BUD. | |
301 | */ | |
302 | STATIC void | |
303 | xfs_bud_item_unlock( | |
304 | struct xfs_log_item *lip) | |
305 | { | |
306 | struct xfs_bud_log_item *budp = BUD_ITEM(lip); | |
307 | ||
308 | if (lip->li_flags & XFS_LI_ABORTED) { | |
309 | xfs_bui_release(budp->bud_buip); | |
310 | kmem_zone_free(xfs_bud_zone, budp); | |
311 | } | |
312 | } | |
313 | ||
314 | /* | |
315 | * When the bud item is committed to disk, all we need to do is delete our | |
316 | * reference to our partner bui item and then free ourselves. Since we're | |
317 | * freeing ourselves we must return -1 to keep the transaction code from | |
318 | * further referencing this item. | |
319 | */ | |
320 | STATIC xfs_lsn_t | |
321 | xfs_bud_item_committed( | |
322 | struct xfs_log_item *lip, | |
323 | xfs_lsn_t lsn) | |
324 | { | |
325 | struct xfs_bud_log_item *budp = BUD_ITEM(lip); | |
326 | ||
327 | /* | |
328 | * Drop the BUI reference regardless of whether the BUD has been | |
329 | * aborted. Once the BUD transaction is constructed, it is the sole | |
330 | * responsibility of the BUD to release the BUI (even if the BUI is | |
331 | * aborted due to log I/O error). | |
332 | */ | |
333 | xfs_bui_release(budp->bud_buip); | |
334 | kmem_zone_free(xfs_bud_zone, budp); | |
335 | ||
336 | return (xfs_lsn_t)-1; | |
337 | } | |
338 | ||
339 | /* | |
340 | * The BUD dependency tracking op doesn't do squat. It can't because | |
341 | * it doesn't know where the free extent is coming from. The dependency | |
342 | * tracking has to be handled by the "enclosing" metadata object. For | |
343 | * example, for inodes, the inode is locked throughout the extent freeing | |
344 | * so the dependency should be recorded there. | |
345 | */ | |
346 | STATIC void | |
347 | xfs_bud_item_committing( | |
348 | struct xfs_log_item *lip, | |
349 | xfs_lsn_t lsn) | |
350 | { | |
351 | } | |
352 | ||
353 | /* | |
354 | * This is the ops vector shared by all bud log items. | |
355 | */ | |
356 | static const struct xfs_item_ops xfs_bud_item_ops = { | |
357 | .iop_size = xfs_bud_item_size, | |
358 | .iop_format = xfs_bud_item_format, | |
359 | .iop_pin = xfs_bud_item_pin, | |
360 | .iop_unpin = xfs_bud_item_unpin, | |
361 | .iop_unlock = xfs_bud_item_unlock, | |
362 | .iop_committed = xfs_bud_item_committed, | |
363 | .iop_push = xfs_bud_item_push, | |
364 | .iop_committing = xfs_bud_item_committing, | |
365 | }; | |
366 | ||
367 | /* | |
368 | * Allocate and initialize an bud item with the given number of extents. | |
369 | */ | |
370 | struct xfs_bud_log_item * | |
371 | xfs_bud_init( | |
372 | struct xfs_mount *mp, | |
373 | struct xfs_bui_log_item *buip) | |
374 | ||
375 | { | |
376 | struct xfs_bud_log_item *budp; | |
377 | ||
378 | budp = kmem_zone_zalloc(xfs_bud_zone, KM_SLEEP); | |
379 | xfs_log_item_init(mp, &budp->bud_item, XFS_LI_BUD, &xfs_bud_item_ops); | |
380 | budp->bud_buip = buip; | |
381 | budp->bud_format.bud_bui_id = buip->bui_format.bui_id; | |
382 | ||
383 | return budp; | |
384 | } | |
77d61fe4 DW |
385 | |
386 | /* | |
387 | * Process a bmap update intent item that was recovered from the log. | |
388 | * We need to update some inode's bmbt. | |
389 | */ | |
390 | int | |
391 | xfs_bui_recover( | |
392 | struct xfs_mount *mp, | |
50995582 DW |
393 | struct xfs_bui_log_item *buip, |
394 | struct xfs_defer_ops *dfops) | |
77d61fe4 DW |
395 | { |
396 | int error = 0; | |
9f3afb57 | 397 | unsigned int bui_type; |
77d61fe4 DW |
398 | struct xfs_map_extent *bmap; |
399 | xfs_fsblock_t startblock_fsb; | |
400 | xfs_fsblock_t inode_fsb; | |
e1a4e37c | 401 | xfs_filblks_t count; |
77d61fe4 | 402 | bool op_ok; |
9f3afb57 DW |
403 | struct xfs_bud_log_item *budp; |
404 | enum xfs_bmap_intent_type type; | |
405 | int whichfork; | |
406 | xfs_exntst_t state; | |
407 | struct xfs_trans *tp; | |
408 | struct xfs_inode *ip = NULL; | |
e1a4e37c | 409 | struct xfs_bmbt_irec irec; |
77d61fe4 DW |
410 | |
411 | ASSERT(!test_bit(XFS_BUI_RECOVERED, &buip->bui_flags)); | |
412 | ||
413 | /* Only one mapping operation per BUI... */ | |
414 | if (buip->bui_format.bui_nextents != XFS_BUI_MAX_FAST_EXTENTS) { | |
415 | set_bit(XFS_BUI_RECOVERED, &buip->bui_flags); | |
416 | xfs_bui_release(buip); | |
417 | return -EIO; | |
418 | } | |
419 | ||
420 | /* | |
421 | * First check the validity of the extent described by the | |
422 | * BUI. If anything is bad, then toss the BUI. | |
423 | */ | |
424 | bmap = &buip->bui_format.bui_extents[0]; | |
425 | startblock_fsb = XFS_BB_TO_FSB(mp, | |
426 | XFS_FSB_TO_DADDR(mp, bmap->me_startblock)); | |
427 | inode_fsb = XFS_BB_TO_FSB(mp, XFS_FSB_TO_DADDR(mp, | |
428 | XFS_INO_TO_FSB(mp, bmap->me_owner))); | |
429 | switch (bmap->me_flags & XFS_BMAP_EXTENT_TYPE_MASK) { | |
430 | case XFS_BMAP_MAP: | |
431 | case XFS_BMAP_UNMAP: | |
432 | op_ok = true; | |
433 | break; | |
434 | default: | |
435 | op_ok = false; | |
436 | break; | |
437 | } | |
438 | if (!op_ok || startblock_fsb == 0 || | |
439 | bmap->me_len == 0 || | |
440 | inode_fsb == 0 || | |
441 | startblock_fsb >= mp->m_sb.sb_dblocks || | |
442 | bmap->me_len >= mp->m_sb.sb_agblocks || | |
443 | inode_fsb >= mp->m_sb.sb_dblocks || | |
444 | (bmap->me_flags & ~XFS_BMAP_EXTENT_FLAGS)) { | |
445 | /* | |
446 | * This will pull the BUI from the AIL and | |
447 | * free the memory associated with it. | |
448 | */ | |
449 | set_bit(XFS_BUI_RECOVERED, &buip->bui_flags); | |
450 | xfs_bui_release(buip); | |
451 | return -EIO; | |
452 | } | |
453 | ||
fe0be23e DW |
454 | error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, |
455 | XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK), 0, 0, &tp); | |
9f3afb57 DW |
456 | if (error) |
457 | return error; | |
458 | budp = xfs_trans_get_bud(tp, buip); | |
459 | ||
460 | /* Grab the inode. */ | |
461 | error = xfs_iget(mp, tp, bmap->me_owner, 0, XFS_ILOCK_EXCL, &ip); | |
462 | if (error) | |
463 | goto err_inode; | |
464 | ||
17c12bcd DW |
465 | if (VFS_I(ip)->i_nlink == 0) |
466 | xfs_iflags_set(ip, XFS_IRECOVERY); | |
9f3afb57 DW |
467 | |
468 | /* Process deferred bmap item. */ | |
469 | state = (bmap->me_flags & XFS_BMAP_EXTENT_UNWRITTEN) ? | |
470 | XFS_EXT_UNWRITTEN : XFS_EXT_NORM; | |
471 | whichfork = (bmap->me_flags & XFS_BMAP_EXTENT_ATTR_FORK) ? | |
472 | XFS_ATTR_FORK : XFS_DATA_FORK; | |
473 | bui_type = bmap->me_flags & XFS_BMAP_EXTENT_TYPE_MASK; | |
474 | switch (bui_type) { | |
475 | case XFS_BMAP_MAP: | |
476 | case XFS_BMAP_UNMAP: | |
477 | type = bui_type; | |
478 | break; | |
479 | default: | |
480 | error = -EFSCORRUPTED; | |
50995582 | 481 | goto err_inode; |
9f3afb57 DW |
482 | } |
483 | xfs_trans_ijoin(tp, ip, 0); | |
484 | ||
e1a4e37c | 485 | count = bmap->me_len; |
50995582 | 486 | error = xfs_trans_log_finish_bmap_update(tp, budp, dfops, type, |
9f3afb57 | 487 | ip, whichfork, bmap->me_startoff, |
e1a4e37c | 488 | bmap->me_startblock, &count, state); |
9f3afb57 | 489 | if (error) |
50995582 | 490 | goto err_inode; |
9f3afb57 | 491 | |
e1a4e37c DW |
492 | if (count > 0) { |
493 | ASSERT(type == XFS_BMAP_UNMAP); | |
494 | irec.br_startblock = bmap->me_startblock; | |
495 | irec.br_blockcount = count; | |
496 | irec.br_startoff = bmap->me_startoff; | |
497 | irec.br_state = state; | |
50995582 | 498 | error = xfs_bmap_unmap_extent(tp->t_mountp, dfops, ip, &irec); |
e1a4e37c | 499 | if (error) |
50995582 | 500 | goto err_inode; |
e1a4e37c DW |
501 | } |
502 | ||
77d61fe4 | 503 | set_bit(XFS_BUI_RECOVERED, &buip->bui_flags); |
9f3afb57 DW |
504 | error = xfs_trans_commit(tp); |
505 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
506 | IRELE(ip); | |
507 | ||
508 | return error; | |
509 | ||
9f3afb57 DW |
510 | err_inode: |
511 | xfs_trans_cancel(tp); | |
512 | if (ip) { | |
513 | xfs_iunlock(ip, XFS_ILOCK_EXCL); | |
514 | IRELE(ip); | |
515 | } | |
77d61fe4 DW |
516 | return error; |
517 | } |