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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
4 * All Rights Reserved.
5 */
6#include "xfs.h"
7#include "xfs_fs.h"
8#include "xfs_shared.h"
9#include "xfs_format.h"
10#include "xfs_log_format.h"
11#include "xfs_trans_resv.h"
12#include "xfs_mount.h"
13#include "xfs_trans.h"
14#include "xfs_buf_item.h"
15#include "xfs_trans_priv.h"
16#include "xfs_trace.h"
17
18/*
19 * Check to see if a buffer matching the given parameters is already
20 * a part of the given transaction.
21 */
22STATIC struct xfs_buf *
23xfs_trans_buf_item_match(
24 struct xfs_trans *tp,
25 struct xfs_buftarg *target,
26 struct xfs_buf_map *map,
27 int nmaps)
28{
29 struct xfs_log_item *lip;
30 struct xfs_buf_log_item *blip;
31 int len = 0;
32 int i;
33
34 for (i = 0; i < nmaps; i++)
35 len += map[i].bm_len;
36
37 list_for_each_entry(lip, &tp->t_items, li_trans) {
38 blip = (struct xfs_buf_log_item *)lip;
39 if (blip->bli_item.li_type == XFS_LI_BUF &&
40 blip->bli_buf->b_target == target &&
41 xfs_buf_daddr(blip->bli_buf) == map[0].bm_bn &&
42 blip->bli_buf->b_length == len) {
43 ASSERT(blip->bli_buf->b_map_count == nmaps);
44 return blip->bli_buf;
45 }
46 }
47
48 return NULL;
49}
50
51/*
52 * Add the locked buffer to the transaction.
53 *
54 * The buffer must be locked, and it cannot be associated with any
55 * transaction.
56 *
57 * If the buffer does not yet have a buf log item associated with it,
58 * then allocate one for it. Then add the buf item to the transaction.
59 */
60STATIC void
61_xfs_trans_bjoin(
62 struct xfs_trans *tp,
63 struct xfs_buf *bp,
64 int reset_recur)
65{
66 struct xfs_buf_log_item *bip;
67
68 ASSERT(bp->b_transp == NULL);
69
70 /*
71 * The xfs_buf_log_item pointer is stored in b_log_item. If
72 * it doesn't have one yet, then allocate one and initialize it.
73 * The checks to see if one is there are in xfs_buf_item_init().
74 */
75 xfs_buf_item_init(bp, tp->t_mountp);
76 bip = bp->b_log_item;
77 ASSERT(!(bip->bli_flags & XFS_BLI_STALE));
78 ASSERT(!(bip->__bli_format.blf_flags & XFS_BLF_CANCEL));
79 ASSERT(!(bip->bli_flags & XFS_BLI_LOGGED));
80 if (reset_recur)
81 bip->bli_recur = 0;
82
83 /*
84 * Take a reference for this transaction on the buf item.
85 */
86 atomic_inc(&bip->bli_refcount);
87
88 /*
89 * Attach the item to the transaction so we can find it in
90 * xfs_trans_get_buf() and friends.
91 */
92 xfs_trans_add_item(tp, &bip->bli_item);
93 bp->b_transp = tp;
94
95}
96
97void
98xfs_trans_bjoin(
99 struct xfs_trans *tp,
100 struct xfs_buf *bp)
101{
102 _xfs_trans_bjoin(tp, bp, 0);
103 trace_xfs_trans_bjoin(bp->b_log_item);
104}
105
106/*
107 * Get and lock the buffer for the caller if it is not already
108 * locked within the given transaction. If it is already locked
109 * within the transaction, just increment its lock recursion count
110 * and return a pointer to it.
111 *
112 * If the transaction pointer is NULL, make this just a normal
113 * get_buf() call.
114 */
115int
116xfs_trans_get_buf_map(
117 struct xfs_trans *tp,
118 struct xfs_buftarg *target,
119 struct xfs_buf_map *map,
120 int nmaps,
121 xfs_buf_flags_t flags,
122 struct xfs_buf **bpp)
123{
124 struct xfs_buf *bp;
125 struct xfs_buf_log_item *bip;
126 int error;
127
128 *bpp = NULL;
129 if (!tp)
130 return xfs_buf_get_map(target, map, nmaps, flags, bpp);
131
132 /*
133 * If we find the buffer in the cache with this transaction
134 * pointer in its b_fsprivate2 field, then we know we already
135 * have it locked. In this case we just increment the lock
136 * recursion count and return the buffer to the caller.
137 */
138 bp = xfs_trans_buf_item_match(tp, target, map, nmaps);
139 if (bp != NULL) {
140 ASSERT(xfs_buf_islocked(bp));
141 if (xfs_is_shutdown(tp->t_mountp)) {
142 xfs_buf_stale(bp);
143 bp->b_flags |= XBF_DONE;
144 }
145
146 ASSERT(bp->b_transp == tp);
147 bip = bp->b_log_item;
148 ASSERT(bip != NULL);
149 ASSERT(atomic_read(&bip->bli_refcount) > 0);
150 bip->bli_recur++;
151 trace_xfs_trans_get_buf_recur(bip);
152 *bpp = bp;
153 return 0;
154 }
155
156 error = xfs_buf_get_map(target, map, nmaps, flags, &bp);
157 if (error)
158 return error;
159
160 ASSERT(!bp->b_error);
161
162 _xfs_trans_bjoin(tp, bp, 1);
163 trace_xfs_trans_get_buf(bp->b_log_item);
164 *bpp = bp;
165 return 0;
166}
167
168/*
169 * Get and lock the superblock buffer for the given transaction.
170 */
171struct xfs_buf *
172xfs_trans_getsb(
173 struct xfs_trans *tp)
174{
175 struct xfs_buf *bp = tp->t_mountp->m_sb_bp;
176
177 /*
178 * Just increment the lock recursion count if the buffer is already
179 * attached to this transaction.
180 */
181 if (bp->b_transp == tp) {
182 struct xfs_buf_log_item *bip = bp->b_log_item;
183
184 ASSERT(bip != NULL);
185 ASSERT(atomic_read(&bip->bli_refcount) > 0);
186 bip->bli_recur++;
187
188 trace_xfs_trans_getsb_recur(bip);
189 } else {
190 xfs_buf_lock(bp);
191 xfs_buf_hold(bp);
192 _xfs_trans_bjoin(tp, bp, 1);
193
194 trace_xfs_trans_getsb(bp->b_log_item);
195 }
196
197 return bp;
198}
199
200/*
201 * Get and lock the buffer for the caller if it is not already
202 * locked within the given transaction. If it has not yet been
203 * read in, read it from disk. If it is already locked
204 * within the transaction and already read in, just increment its
205 * lock recursion count and return a pointer to it.
206 *
207 * If the transaction pointer is NULL, make this just a normal
208 * read_buf() call.
209 */
210int
211xfs_trans_read_buf_map(
212 struct xfs_mount *mp,
213 struct xfs_trans *tp,
214 struct xfs_buftarg *target,
215 struct xfs_buf_map *map,
216 int nmaps,
217 xfs_buf_flags_t flags,
218 struct xfs_buf **bpp,
219 const struct xfs_buf_ops *ops)
220{
221 struct xfs_buf *bp = NULL;
222 struct xfs_buf_log_item *bip;
223 int error;
224
225 *bpp = NULL;
226 /*
227 * If we find the buffer in the cache with this transaction
228 * pointer in its b_fsprivate2 field, then we know we already
229 * have it locked. If it is already read in we just increment
230 * the lock recursion count and return the buffer to the caller.
231 * If the buffer is not yet read in, then we read it in, increment
232 * the lock recursion count, and return it to the caller.
233 */
234 if (tp)
235 bp = xfs_trans_buf_item_match(tp, target, map, nmaps);
236 if (bp) {
237 ASSERT(xfs_buf_islocked(bp));
238 ASSERT(bp->b_transp == tp);
239 ASSERT(bp->b_log_item != NULL);
240 ASSERT(!bp->b_error);
241 ASSERT(bp->b_flags & XBF_DONE);
242
243 /*
244 * We never locked this buf ourselves, so we shouldn't
245 * brelse it either. Just get out.
246 */
247 if (xfs_is_shutdown(mp)) {
248 trace_xfs_trans_read_buf_shut(bp, _RET_IP_);
249 return -EIO;
250 }
251
252 /*
253 * Check if the caller is trying to read a buffer that is
254 * already attached to the transaction yet has no buffer ops
255 * assigned. Ops are usually attached when the buffer is
256 * attached to the transaction, or by the read caller if
257 * special circumstances. That didn't happen, which is not
258 * how this is supposed to go.
259 *
260 * If the buffer passes verification we'll let this go, but if
261 * not we have to shut down. Let the transaction cleanup code
262 * release this buffer when it kills the tranaction.
263 */
264 ASSERT(bp->b_ops != NULL);
265 error = xfs_buf_reverify(bp, ops);
266 if (error) {
267 xfs_buf_ioerror_alert(bp, __return_address);
268
269 if (tp->t_flags & XFS_TRANS_DIRTY)
270 xfs_force_shutdown(tp->t_mountp,
271 SHUTDOWN_META_IO_ERROR);
272
273 /* bad CRC means corrupted metadata */
274 if (error == -EFSBADCRC)
275 error = -EFSCORRUPTED;
276 return error;
277 }
278
279 bip = bp->b_log_item;
280 bip->bli_recur++;
281
282 ASSERT(atomic_read(&bip->bli_refcount) > 0);
283 trace_xfs_trans_read_buf_recur(bip);
284 ASSERT(bp->b_ops != NULL || ops == NULL);
285 *bpp = bp;
286 return 0;
287 }
288
289 error = xfs_buf_read_map(target, map, nmaps, flags, &bp, ops,
290 __return_address);
291 switch (error) {
292 case 0:
293 break;
294 default:
295 if (tp && (tp->t_flags & XFS_TRANS_DIRTY))
296 xfs_force_shutdown(tp->t_mountp, SHUTDOWN_META_IO_ERROR);
297 fallthrough;
298 case -ENOMEM:
299 case -EAGAIN:
300 return error;
301 }
302
303 if (xfs_is_shutdown(mp)) {
304 xfs_buf_relse(bp);
305 trace_xfs_trans_read_buf_shut(bp, _RET_IP_);
306 return -EIO;
307 }
308
309 if (tp) {
310 _xfs_trans_bjoin(tp, bp, 1);
311 trace_xfs_trans_read_buf(bp->b_log_item);
312 }
313 ASSERT(bp->b_ops != NULL || ops == NULL);
314 *bpp = bp;
315 return 0;
316
317}
318
319/* Has this buffer been dirtied by anyone? */
320bool
321xfs_trans_buf_is_dirty(
322 struct xfs_buf *bp)
323{
324 struct xfs_buf_log_item *bip = bp->b_log_item;
325
326 if (!bip)
327 return false;
328 ASSERT(bip->bli_item.li_type == XFS_LI_BUF);
329 return test_bit(XFS_LI_DIRTY, &bip->bli_item.li_flags);
330}
331
332/*
333 * Release a buffer previously joined to the transaction. If the buffer is
334 * modified within this transaction, decrement the recursion count but do not
335 * release the buffer even if the count goes to 0. If the buffer is not modified
336 * within the transaction, decrement the recursion count and release the buffer
337 * if the recursion count goes to 0.
338 *
339 * If the buffer is to be released and it was not already dirty before this
340 * transaction began, then also free the buf_log_item associated with it.
341 *
342 * If the transaction pointer is NULL, this is a normal xfs_buf_relse() call.
343 */
344void
345xfs_trans_brelse(
346 struct xfs_trans *tp,
347 struct xfs_buf *bp)
348{
349 struct xfs_buf_log_item *bip = bp->b_log_item;
350
351 ASSERT(bp->b_transp == tp);
352
353 if (!tp) {
354 xfs_buf_relse(bp);
355 return;
356 }
357
358 trace_xfs_trans_brelse(bip);
359 ASSERT(bip->bli_item.li_type == XFS_LI_BUF);
360 ASSERT(atomic_read(&bip->bli_refcount) > 0);
361
362 /*
363 * If the release is for a recursive lookup, then decrement the count
364 * and return.
365 */
366 if (bip->bli_recur > 0) {
367 bip->bli_recur--;
368 return;
369 }
370
371 /*
372 * If the buffer is invalidated or dirty in this transaction, we can't
373 * release it until we commit.
374 */
375 if (test_bit(XFS_LI_DIRTY, &bip->bli_item.li_flags))
376 return;
377 if (bip->bli_flags & XFS_BLI_STALE)
378 return;
379
380 /*
381 * Unlink the log item from the transaction and clear the hold flag, if
382 * set. We wouldn't want the next user of the buffer to get confused.
383 */
384 ASSERT(!(bip->bli_flags & XFS_BLI_LOGGED));
385 xfs_trans_del_item(&bip->bli_item);
386 bip->bli_flags &= ~XFS_BLI_HOLD;
387
388 /* drop the reference to the bli */
389 xfs_buf_item_put(bip);
390
391 bp->b_transp = NULL;
392 xfs_buf_relse(bp);
393}
394
395/*
396 * Mark the buffer as not needing to be unlocked when the buf item's
397 * iop_committing() routine is called. The buffer must already be locked
398 * and associated with the given transaction.
399 */
400/* ARGSUSED */
401void
402xfs_trans_bhold(
403 xfs_trans_t *tp,
404 struct xfs_buf *bp)
405{
406 struct xfs_buf_log_item *bip = bp->b_log_item;
407
408 ASSERT(bp->b_transp == tp);
409 ASSERT(bip != NULL);
410 ASSERT(!(bip->bli_flags & XFS_BLI_STALE));
411 ASSERT(!(bip->__bli_format.blf_flags & XFS_BLF_CANCEL));
412 ASSERT(atomic_read(&bip->bli_refcount) > 0);
413
414 bip->bli_flags |= XFS_BLI_HOLD;
415 trace_xfs_trans_bhold(bip);
416}
417
418/*
419 * Cancel the previous buffer hold request made on this buffer
420 * for this transaction.
421 */
422void
423xfs_trans_bhold_release(
424 xfs_trans_t *tp,
425 struct xfs_buf *bp)
426{
427 struct xfs_buf_log_item *bip = bp->b_log_item;
428
429 ASSERT(bp->b_transp == tp);
430 ASSERT(bip != NULL);
431 ASSERT(!(bip->bli_flags & XFS_BLI_STALE));
432 ASSERT(!(bip->__bli_format.blf_flags & XFS_BLF_CANCEL));
433 ASSERT(atomic_read(&bip->bli_refcount) > 0);
434 ASSERT(bip->bli_flags & XFS_BLI_HOLD);
435
436 bip->bli_flags &= ~XFS_BLI_HOLD;
437 trace_xfs_trans_bhold_release(bip);
438}
439
440/*
441 * Mark a buffer dirty in the transaction.
442 */
443void
444xfs_trans_dirty_buf(
445 struct xfs_trans *tp,
446 struct xfs_buf *bp)
447{
448 struct xfs_buf_log_item *bip = bp->b_log_item;
449
450 ASSERT(bp->b_transp == tp);
451 ASSERT(bip != NULL);
452
453 /*
454 * Mark the buffer as needing to be written out eventually,
455 * and set its iodone function to remove the buffer's buf log
456 * item from the AIL and free it when the buffer is flushed
457 * to disk.
458 */
459 bp->b_flags |= XBF_DONE;
460
461 ASSERT(atomic_read(&bip->bli_refcount) > 0);
462
463 /*
464 * If we invalidated the buffer within this transaction, then
465 * cancel the invalidation now that we're dirtying the buffer
466 * again. There are no races with the code in xfs_buf_item_unpin(),
467 * because we have a reference to the buffer this entire time.
468 */
469 if (bip->bli_flags & XFS_BLI_STALE) {
470 bip->bli_flags &= ~XFS_BLI_STALE;
471 ASSERT(bp->b_flags & XBF_STALE);
472 bp->b_flags &= ~XBF_STALE;
473 bip->__bli_format.blf_flags &= ~XFS_BLF_CANCEL;
474 }
475 bip->bli_flags |= XFS_BLI_DIRTY | XFS_BLI_LOGGED;
476
477 tp->t_flags |= XFS_TRANS_DIRTY;
478 set_bit(XFS_LI_DIRTY, &bip->bli_item.li_flags);
479}
480
481/*
482 * This is called to mark bytes first through last inclusive of the given
483 * buffer as needing to be logged when the transaction is committed.
484 * The buffer must already be associated with the given transaction.
485 *
486 * First and last are numbers relative to the beginning of this buffer,
487 * so the first byte in the buffer is numbered 0 regardless of the
488 * value of b_blkno.
489 */
490void
491xfs_trans_log_buf(
492 struct xfs_trans *tp,
493 struct xfs_buf *bp,
494 uint first,
495 uint last)
496{
497 struct xfs_buf_log_item *bip = bp->b_log_item;
498
499 ASSERT(first <= last && last < BBTOB(bp->b_length));
500 ASSERT(!(bip->bli_flags & XFS_BLI_ORDERED));
501
502 xfs_trans_dirty_buf(tp, bp);
503
504 trace_xfs_trans_log_buf(bip);
505 xfs_buf_item_log(bip, first, last);
506}
507
508
509/*
510 * Invalidate a buffer that is being used within a transaction.
511 *
512 * Typically this is because the blocks in the buffer are being freed, so we
513 * need to prevent it from being written out when we're done. Allowing it
514 * to be written again might overwrite data in the free blocks if they are
515 * reallocated to a file.
516 *
517 * We prevent the buffer from being written out by marking it stale. We can't
518 * get rid of the buf log item at this point because the buffer may still be
519 * pinned by another transaction. If that is the case, then we'll wait until
520 * the buffer is committed to disk for the last time (we can tell by the ref
521 * count) and free it in xfs_buf_item_unpin(). Until that happens we will
522 * keep the buffer locked so that the buffer and buf log item are not reused.
523 *
524 * We also set the XFS_BLF_CANCEL flag in the buf log format structure and log
525 * the buf item. This will be used at recovery time to determine that copies
526 * of the buffer in the log before this should not be replayed.
527 *
528 * We mark the item descriptor and the transaction dirty so that we'll hold
529 * the buffer until after the commit.
530 *
531 * Since we're invalidating the buffer, we also clear the state about which
532 * parts of the buffer have been logged. We also clear the flag indicating
533 * that this is an inode buffer since the data in the buffer will no longer
534 * be valid.
535 *
536 * We set the stale bit in the buffer as well since we're getting rid of it.
537 */
538void
539xfs_trans_binval(
540 xfs_trans_t *tp,
541 struct xfs_buf *bp)
542{
543 struct xfs_buf_log_item *bip = bp->b_log_item;
544 int i;
545
546 ASSERT(bp->b_transp == tp);
547 ASSERT(bip != NULL);
548 ASSERT(atomic_read(&bip->bli_refcount) > 0);
549
550 trace_xfs_trans_binval(bip);
551
552 if (bip->bli_flags & XFS_BLI_STALE) {
553 /*
554 * If the buffer is already invalidated, then
555 * just return.
556 */
557 ASSERT(bp->b_flags & XBF_STALE);
558 ASSERT(!(bip->bli_flags & (XFS_BLI_LOGGED | XFS_BLI_DIRTY)));
559 ASSERT(!(bip->__bli_format.blf_flags & XFS_BLF_INODE_BUF));
560 ASSERT(!(bip->__bli_format.blf_flags & XFS_BLFT_MASK));
561 ASSERT(bip->__bli_format.blf_flags & XFS_BLF_CANCEL);
562 ASSERT(test_bit(XFS_LI_DIRTY, &bip->bli_item.li_flags));
563 ASSERT(tp->t_flags & XFS_TRANS_DIRTY);
564 return;
565 }
566
567 xfs_buf_stale(bp);
568
569 bip->bli_flags |= XFS_BLI_STALE;
570 bip->bli_flags &= ~(XFS_BLI_INODE_BUF | XFS_BLI_LOGGED | XFS_BLI_DIRTY);
571 bip->__bli_format.blf_flags &= ~XFS_BLF_INODE_BUF;
572 bip->__bli_format.blf_flags |= XFS_BLF_CANCEL;
573 bip->__bli_format.blf_flags &= ~XFS_BLFT_MASK;
574 for (i = 0; i < bip->bli_format_count; i++) {
575 memset(bip->bli_formats[i].blf_data_map, 0,
576 (bip->bli_formats[i].blf_map_size * sizeof(uint)));
577 }
578 set_bit(XFS_LI_DIRTY, &bip->bli_item.li_flags);
579 tp->t_flags |= XFS_TRANS_DIRTY;
580}
581
582/*
583 * This call is used to indicate that the buffer contains on-disk inodes which
584 * must be handled specially during recovery. They require special handling
585 * because only the di_next_unlinked from the inodes in the buffer should be
586 * recovered. The rest of the data in the buffer is logged via the inodes
587 * themselves.
588 *
589 * All we do is set the XFS_BLI_INODE_BUF flag in the items flags so it can be
590 * transferred to the buffer's log format structure so that we'll know what to
591 * do at recovery time.
592 */
593void
594xfs_trans_inode_buf(
595 xfs_trans_t *tp,
596 struct xfs_buf *bp)
597{
598 struct xfs_buf_log_item *bip = bp->b_log_item;
599
600 ASSERT(bp->b_transp == tp);
601 ASSERT(bip != NULL);
602 ASSERT(atomic_read(&bip->bli_refcount) > 0);
603
604 bip->bli_flags |= XFS_BLI_INODE_BUF;
605 bp->b_flags |= _XBF_INODES;
606 xfs_trans_buf_set_type(tp, bp, XFS_BLFT_DINO_BUF);
607}
608
609/*
610 * This call is used to indicate that the buffer is going to
611 * be staled and was an inode buffer. This means it gets
612 * special processing during unpin - where any inodes
613 * associated with the buffer should be removed from ail.
614 * There is also special processing during recovery,
615 * any replay of the inodes in the buffer needs to be
616 * prevented as the buffer may have been reused.
617 */
618void
619xfs_trans_stale_inode_buf(
620 xfs_trans_t *tp,
621 struct xfs_buf *bp)
622{
623 struct xfs_buf_log_item *bip = bp->b_log_item;
624
625 ASSERT(bp->b_transp == tp);
626 ASSERT(bip != NULL);
627 ASSERT(atomic_read(&bip->bli_refcount) > 0);
628
629 bip->bli_flags |= XFS_BLI_STALE_INODE;
630 bp->b_flags |= _XBF_INODES;
631 xfs_trans_buf_set_type(tp, bp, XFS_BLFT_DINO_BUF);
632}
633
634/*
635 * Mark the buffer as being one which contains newly allocated
636 * inodes. We need to make sure that even if this buffer is
637 * relogged as an 'inode buf' we still recover all of the inode
638 * images in the face of a crash. This works in coordination with
639 * xfs_buf_item_committed() to ensure that the buffer remains in the
640 * AIL at its original location even after it has been relogged.
641 */
642/* ARGSUSED */
643void
644xfs_trans_inode_alloc_buf(
645 xfs_trans_t *tp,
646 struct xfs_buf *bp)
647{
648 struct xfs_buf_log_item *bip = bp->b_log_item;
649
650 ASSERT(bp->b_transp == tp);
651 ASSERT(bip != NULL);
652 ASSERT(atomic_read(&bip->bli_refcount) > 0);
653
654 bip->bli_flags |= XFS_BLI_INODE_ALLOC_BUF;
655 bp->b_flags |= _XBF_INODES;
656 xfs_trans_buf_set_type(tp, bp, XFS_BLFT_DINO_BUF);
657}
658
659/*
660 * Mark the buffer as ordered for this transaction. This means that the contents
661 * of the buffer are not recorded in the transaction but it is tracked in the
662 * AIL as though it was. This allows us to record logical changes in
663 * transactions rather than the physical changes we make to the buffer without
664 * changing writeback ordering constraints of metadata buffers.
665 */
666bool
667xfs_trans_ordered_buf(
668 struct xfs_trans *tp,
669 struct xfs_buf *bp)
670{
671 struct xfs_buf_log_item *bip = bp->b_log_item;
672
673 ASSERT(bp->b_transp == tp);
674 ASSERT(bip != NULL);
675 ASSERT(atomic_read(&bip->bli_refcount) > 0);
676
677 if (xfs_buf_item_dirty_format(bip))
678 return false;
679
680 bip->bli_flags |= XFS_BLI_ORDERED;
681 trace_xfs_buf_item_ordered(bip);
682
683 /*
684 * We don't log a dirty range of an ordered buffer but it still needs
685 * to be marked dirty and that it has been logged.
686 */
687 xfs_trans_dirty_buf(tp, bp);
688 return true;
689}
690
691/*
692 * Set the type of the buffer for log recovery so that it can correctly identify
693 * and hence attach the correct buffer ops to the buffer after replay.
694 */
695void
696xfs_trans_buf_set_type(
697 struct xfs_trans *tp,
698 struct xfs_buf *bp,
699 enum xfs_blft type)
700{
701 struct xfs_buf_log_item *bip = bp->b_log_item;
702
703 if (!tp)
704 return;
705
706 ASSERT(bp->b_transp == tp);
707 ASSERT(bip != NULL);
708 ASSERT(atomic_read(&bip->bli_refcount) > 0);
709
710 xfs_blft_to_flags(&bip->__bli_format, type);
711}
712
713void
714xfs_trans_buf_copy_type(
715 struct xfs_buf *dst_bp,
716 struct xfs_buf *src_bp)
717{
718 struct xfs_buf_log_item *sbip = src_bp->b_log_item;
719 struct xfs_buf_log_item *dbip = dst_bp->b_log_item;
720 enum xfs_blft type;
721
722 type = xfs_blft_from_flags(&sbip->__bli_format);
723 xfs_blft_to_flags(&dbip->__bli_format, type);
724}
725
726/*
727 * Similar to xfs_trans_inode_buf(), this marks the buffer as a cluster of
728 * dquots. However, unlike in inode buffer recovery, dquot buffers get
729 * recovered in their entirety. (Hence, no XFS_BLI_DQUOT_ALLOC_BUF flag).
730 * The only thing that makes dquot buffers different from regular
731 * buffers is that we must not replay dquot bufs when recovering
732 * if a _corresponding_ quotaoff has happened. We also have to distinguish
733 * between usr dquot bufs and grp dquot bufs, because usr and grp quotas
734 * can be turned off independently.
735 */
736/* ARGSUSED */
737void
738xfs_trans_dquot_buf(
739 xfs_trans_t *tp,
740 struct xfs_buf *bp,
741 uint type)
742{
743 struct xfs_buf_log_item *bip = bp->b_log_item;
744
745 ASSERT(type == XFS_BLF_UDQUOT_BUF ||
746 type == XFS_BLF_PDQUOT_BUF ||
747 type == XFS_BLF_GDQUOT_BUF);
748
749 bip->__bli_format.blf_flags |= type;
750
751 switch (type) {
752 case XFS_BLF_UDQUOT_BUF:
753 type = XFS_BLFT_UDQUOT_BUF;
754 break;
755 case XFS_BLF_PDQUOT_BUF:
756 type = XFS_BLFT_PDQUOT_BUF;
757 break;
758 case XFS_BLF_GDQUOT_BUF:
759 type = XFS_BLFT_GDQUOT_BUF;
760 break;
761 default:
762 type = XFS_BLFT_UNKNOWN_BUF;
763 break;
764 }
765
766 bp->b_flags |= _XBF_DQUOTS;
767 xfs_trans_buf_set_type(tp, bp, type);
768}
1/*
2 * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
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
7 * published by the Free Software Foundation.
8 *
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.
13 *
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
17 */
18#include "xfs.h"
19#include "xfs_fs.h"
20#include "xfs_shared.h"
21#include "xfs_format.h"
22#include "xfs_log_format.h"
23#include "xfs_trans_resv.h"
24#include "xfs_mount.h"
25#include "xfs_inode.h"
26#include "xfs_trans.h"
27#include "xfs_buf_item.h"
28#include "xfs_trans_priv.h"
29#include "xfs_error.h"
30#include "xfs_trace.h"
31
32/*
33 * Check to see if a buffer matching the given parameters is already
34 * a part of the given transaction.
35 */
36STATIC struct xfs_buf *
37xfs_trans_buf_item_match(
38 struct xfs_trans *tp,
39 struct xfs_buftarg *target,
40 struct xfs_buf_map *map,
41 int nmaps)
42{
43 struct xfs_log_item_desc *lidp;
44 struct xfs_buf_log_item *blip;
45 int len = 0;
46 int i;
47
48 for (i = 0; i < nmaps; i++)
49 len += map[i].bm_len;
50
51 list_for_each_entry(lidp, &tp->t_items, lid_trans) {
52 blip = (struct xfs_buf_log_item *)lidp->lid_item;
53 if (blip->bli_item.li_type == XFS_LI_BUF &&
54 blip->bli_buf->b_target == target &&
55 XFS_BUF_ADDR(blip->bli_buf) == map[0].bm_bn &&
56 blip->bli_buf->b_length == len) {
57 ASSERT(blip->bli_buf->b_map_count == nmaps);
58 return blip->bli_buf;
59 }
60 }
61
62 return NULL;
63}
64
65/*
66 * Add the locked buffer to the transaction.
67 *
68 * The buffer must be locked, and it cannot be associated with any
69 * transaction.
70 *
71 * If the buffer does not yet have a buf log item associated with it,
72 * then allocate one for it. Then add the buf item to the transaction.
73 */
74STATIC void
75_xfs_trans_bjoin(
76 struct xfs_trans *tp,
77 struct xfs_buf *bp,
78 int reset_recur)
79{
80 struct xfs_buf_log_item *bip;
81
82 ASSERT(bp->b_transp == NULL);
83
84 /*
85 * The xfs_buf_log_item pointer is stored in b_fsprivate. If
86 * it doesn't have one yet, then allocate one and initialize it.
87 * The checks to see if one is there are in xfs_buf_item_init().
88 */
89 xfs_buf_item_init(bp, tp->t_mountp);
90 bip = bp->b_fspriv;
91 ASSERT(!(bip->bli_flags & XFS_BLI_STALE));
92 ASSERT(!(bip->__bli_format.blf_flags & XFS_BLF_CANCEL));
93 ASSERT(!(bip->bli_flags & XFS_BLI_LOGGED));
94 if (reset_recur)
95 bip->bli_recur = 0;
96
97 /*
98 * Take a reference for this transaction on the buf item.
99 */
100 atomic_inc(&bip->bli_refcount);
101
102 /*
103 * Get a log_item_desc to point at the new item.
104 */
105 xfs_trans_add_item(tp, &bip->bli_item);
106
107 /*
108 * Initialize b_fsprivate2 so we can find it with incore_match()
109 * in xfs_trans_get_buf() and friends above.
110 */
111 bp->b_transp = tp;
112
113}
114
115void
116xfs_trans_bjoin(
117 struct xfs_trans *tp,
118 struct xfs_buf *bp)
119{
120 _xfs_trans_bjoin(tp, bp, 0);
121 trace_xfs_trans_bjoin(bp->b_fspriv);
122}
123
124/*
125 * Get and lock the buffer for the caller if it is not already
126 * locked within the given transaction. If it is already locked
127 * within the transaction, just increment its lock recursion count
128 * and return a pointer to it.
129 *
130 * If the transaction pointer is NULL, make this just a normal
131 * get_buf() call.
132 */
133struct xfs_buf *
134xfs_trans_get_buf_map(
135 struct xfs_trans *tp,
136 struct xfs_buftarg *target,
137 struct xfs_buf_map *map,
138 int nmaps,
139 xfs_buf_flags_t flags)
140{
141 xfs_buf_t *bp;
142 xfs_buf_log_item_t *bip;
143
144 if (!tp)
145 return xfs_buf_get_map(target, map, nmaps, flags);
146
147 /*
148 * If we find the buffer in the cache with this transaction
149 * pointer in its b_fsprivate2 field, then we know we already
150 * have it locked. In this case we just increment the lock
151 * recursion count and return the buffer to the caller.
152 */
153 bp = xfs_trans_buf_item_match(tp, target, map, nmaps);
154 if (bp != NULL) {
155 ASSERT(xfs_buf_islocked(bp));
156 if (XFS_FORCED_SHUTDOWN(tp->t_mountp)) {
157 xfs_buf_stale(bp);
158 bp->b_flags |= XBF_DONE;
159 }
160
161 ASSERT(bp->b_transp == tp);
162 bip = bp->b_fspriv;
163 ASSERT(bip != NULL);
164 ASSERT(atomic_read(&bip->bli_refcount) > 0);
165 bip->bli_recur++;
166 trace_xfs_trans_get_buf_recur(bip);
167 return bp;
168 }
169
170 bp = xfs_buf_get_map(target, map, nmaps, flags);
171 if (bp == NULL) {
172 return NULL;
173 }
174
175 ASSERT(!bp->b_error);
176
177 _xfs_trans_bjoin(tp, bp, 1);
178 trace_xfs_trans_get_buf(bp->b_fspriv);
179 return bp;
180}
181
182/*
183 * Get and lock the superblock buffer of this file system for the
184 * given transaction.
185 *
186 * We don't need to use incore_match() here, because the superblock
187 * buffer is a private buffer which we keep a pointer to in the
188 * mount structure.
189 */
190xfs_buf_t *
191xfs_trans_getsb(xfs_trans_t *tp,
192 struct xfs_mount *mp,
193 int flags)
194{
195 xfs_buf_t *bp;
196 xfs_buf_log_item_t *bip;
197
198 /*
199 * Default to just trying to lock the superblock buffer
200 * if tp is NULL.
201 */
202 if (tp == NULL)
203 return xfs_getsb(mp, flags);
204
205 /*
206 * If the superblock buffer already has this transaction
207 * pointer in its b_fsprivate2 field, then we know we already
208 * have it locked. In this case we just increment the lock
209 * recursion count and return the buffer to the caller.
210 */
211 bp = mp->m_sb_bp;
212 if (bp->b_transp == tp) {
213 bip = bp->b_fspriv;
214 ASSERT(bip != NULL);
215 ASSERT(atomic_read(&bip->bli_refcount) > 0);
216 bip->bli_recur++;
217 trace_xfs_trans_getsb_recur(bip);
218 return bp;
219 }
220
221 bp = xfs_getsb(mp, flags);
222 if (bp == NULL)
223 return NULL;
224
225 _xfs_trans_bjoin(tp, bp, 1);
226 trace_xfs_trans_getsb(bp->b_fspriv);
227 return bp;
228}
229
230/*
231 * Get and lock the buffer for the caller if it is not already
232 * locked within the given transaction. If it has not yet been
233 * read in, read it from disk. If it is already locked
234 * within the transaction and already read in, just increment its
235 * lock recursion count and return a pointer to it.
236 *
237 * If the transaction pointer is NULL, make this just a normal
238 * read_buf() call.
239 */
240int
241xfs_trans_read_buf_map(
242 struct xfs_mount *mp,
243 struct xfs_trans *tp,
244 struct xfs_buftarg *target,
245 struct xfs_buf_map *map,
246 int nmaps,
247 xfs_buf_flags_t flags,
248 struct xfs_buf **bpp,
249 const struct xfs_buf_ops *ops)
250{
251 struct xfs_buf *bp = NULL;
252 struct xfs_buf_log_item *bip;
253 int error;
254
255 *bpp = NULL;
256 /*
257 * If we find the buffer in the cache with this transaction
258 * pointer in its b_fsprivate2 field, then we know we already
259 * have it locked. If it is already read in we just increment
260 * the lock recursion count and return the buffer to the caller.
261 * If the buffer is not yet read in, then we read it in, increment
262 * the lock recursion count, and return it to the caller.
263 */
264 if (tp)
265 bp = xfs_trans_buf_item_match(tp, target, map, nmaps);
266 if (bp) {
267 ASSERT(xfs_buf_islocked(bp));
268 ASSERT(bp->b_transp == tp);
269 ASSERT(bp->b_fspriv != NULL);
270 ASSERT(!bp->b_error);
271 ASSERT(bp->b_flags & XBF_DONE);
272
273 /*
274 * We never locked this buf ourselves, so we shouldn't
275 * brelse it either. Just get out.
276 */
277 if (XFS_FORCED_SHUTDOWN(mp)) {
278 trace_xfs_trans_read_buf_shut(bp, _RET_IP_);
279 return -EIO;
280 }
281
282 bip = bp->b_fspriv;
283 bip->bli_recur++;
284
285 ASSERT(atomic_read(&bip->bli_refcount) > 0);
286 trace_xfs_trans_read_buf_recur(bip);
287 *bpp = bp;
288 return 0;
289 }
290
291 bp = xfs_buf_read_map(target, map, nmaps, flags, ops);
292 if (!bp) {
293 if (!(flags & XBF_TRYLOCK))
294 return -ENOMEM;
295 return tp ? 0 : -EAGAIN;
296 }
297
298 /*
299 * If we've had a read error, then the contents of the buffer are
300 * invalid and should not be used. To ensure that a followup read tries
301 * to pull the buffer from disk again, we clear the XBF_DONE flag and
302 * mark the buffer stale. This ensures that anyone who has a current
303 * reference to the buffer will interpret it's contents correctly and
304 * future cache lookups will also treat it as an empty, uninitialised
305 * buffer.
306 */
307 if (bp->b_error) {
308 error = bp->b_error;
309 if (!XFS_FORCED_SHUTDOWN(mp))
310 xfs_buf_ioerror_alert(bp, __func__);
311 bp->b_flags &= ~XBF_DONE;
312 xfs_buf_stale(bp);
313
314 if (tp && (tp->t_flags & XFS_TRANS_DIRTY))
315 xfs_force_shutdown(tp->t_mountp, SHUTDOWN_META_IO_ERROR);
316 xfs_buf_relse(bp);
317
318 /* bad CRC means corrupted metadata */
319 if (error == -EFSBADCRC)
320 error = -EFSCORRUPTED;
321 return error;
322 }
323
324 if (XFS_FORCED_SHUTDOWN(mp)) {
325 xfs_buf_relse(bp);
326 trace_xfs_trans_read_buf_shut(bp, _RET_IP_);
327 return -EIO;
328 }
329
330 if (tp) {
331 _xfs_trans_bjoin(tp, bp, 1);
332 trace_xfs_trans_read_buf(bp->b_fspriv);
333 }
334 *bpp = bp;
335 return 0;
336
337}
338
339/*
340 * Release the buffer bp which was previously acquired with one of the
341 * xfs_trans_... buffer allocation routines if the buffer has not
342 * been modified within this transaction. If the buffer is modified
343 * within this transaction, do decrement the recursion count but do
344 * not release the buffer even if the count goes to 0. If the buffer is not
345 * modified within the transaction, decrement the recursion count and
346 * release the buffer if the recursion count goes to 0.
347 *
348 * If the buffer is to be released and it was not modified before
349 * this transaction began, then free the buf_log_item associated with it.
350 *
351 * If the transaction pointer is NULL, make this just a normal
352 * brelse() call.
353 */
354void
355xfs_trans_brelse(xfs_trans_t *tp,
356 xfs_buf_t *bp)
357{
358 xfs_buf_log_item_t *bip;
359
360 /*
361 * Default to a normal brelse() call if the tp is NULL.
362 */
363 if (tp == NULL) {
364 ASSERT(bp->b_transp == NULL);
365 xfs_buf_relse(bp);
366 return;
367 }
368
369 ASSERT(bp->b_transp == tp);
370 bip = bp->b_fspriv;
371 ASSERT(bip->bli_item.li_type == XFS_LI_BUF);
372 ASSERT(!(bip->bli_flags & XFS_BLI_STALE));
373 ASSERT(!(bip->__bli_format.blf_flags & XFS_BLF_CANCEL));
374 ASSERT(atomic_read(&bip->bli_refcount) > 0);
375
376 trace_xfs_trans_brelse(bip);
377
378 /*
379 * If the release is just for a recursive lock,
380 * then decrement the count and return.
381 */
382 if (bip->bli_recur > 0) {
383 bip->bli_recur--;
384 return;
385 }
386
387 /*
388 * If the buffer is dirty within this transaction, we can't
389 * release it until we commit.
390 */
391 if (bip->bli_item.li_desc->lid_flags & XFS_LID_DIRTY)
392 return;
393
394 /*
395 * If the buffer has been invalidated, then we can't release
396 * it until the transaction commits to disk unless it is re-dirtied
397 * as part of this transaction. This prevents us from pulling
398 * the item from the AIL before we should.
399 */
400 if (bip->bli_flags & XFS_BLI_STALE)
401 return;
402
403 ASSERT(!(bip->bli_flags & XFS_BLI_LOGGED));
404
405 /*
406 * Free up the log item descriptor tracking the released item.
407 */
408 xfs_trans_del_item(&bip->bli_item);
409
410 /*
411 * Clear the hold flag in the buf log item if it is set.
412 * We wouldn't want the next user of the buffer to
413 * get confused.
414 */
415 if (bip->bli_flags & XFS_BLI_HOLD) {
416 bip->bli_flags &= ~XFS_BLI_HOLD;
417 }
418
419 /*
420 * Drop our reference to the buf log item.
421 */
422 atomic_dec(&bip->bli_refcount);
423
424 /*
425 * If the buf item is not tracking data in the log, then
426 * we must free it before releasing the buffer back to the
427 * free pool. Before releasing the buffer to the free pool,
428 * clear the transaction pointer in b_fsprivate2 to dissolve
429 * its relation to this transaction.
430 */
431 if (!xfs_buf_item_dirty(bip)) {
432/***
433 ASSERT(bp->b_pincount == 0);
434***/
435 ASSERT(atomic_read(&bip->bli_refcount) == 0);
436 ASSERT(!(bip->bli_item.li_flags & XFS_LI_IN_AIL));
437 ASSERT(!(bip->bli_flags & XFS_BLI_INODE_ALLOC_BUF));
438 xfs_buf_item_relse(bp);
439 }
440
441 bp->b_transp = NULL;
442 xfs_buf_relse(bp);
443}
444
445/*
446 * Mark the buffer as not needing to be unlocked when the buf item's
447 * iop_unlock() routine is called. The buffer must already be locked
448 * and associated with the given transaction.
449 */
450/* ARGSUSED */
451void
452xfs_trans_bhold(xfs_trans_t *tp,
453 xfs_buf_t *bp)
454{
455 xfs_buf_log_item_t *bip = bp->b_fspriv;
456
457 ASSERT(bp->b_transp == tp);
458 ASSERT(bip != NULL);
459 ASSERT(!(bip->bli_flags & XFS_BLI_STALE));
460 ASSERT(!(bip->__bli_format.blf_flags & XFS_BLF_CANCEL));
461 ASSERT(atomic_read(&bip->bli_refcount) > 0);
462
463 bip->bli_flags |= XFS_BLI_HOLD;
464 trace_xfs_trans_bhold(bip);
465}
466
467/*
468 * Cancel the previous buffer hold request made on this buffer
469 * for this transaction.
470 */
471void
472xfs_trans_bhold_release(xfs_trans_t *tp,
473 xfs_buf_t *bp)
474{
475 xfs_buf_log_item_t *bip = bp->b_fspriv;
476
477 ASSERT(bp->b_transp == tp);
478 ASSERT(bip != NULL);
479 ASSERT(!(bip->bli_flags & XFS_BLI_STALE));
480 ASSERT(!(bip->__bli_format.blf_flags & XFS_BLF_CANCEL));
481 ASSERT(atomic_read(&bip->bli_refcount) > 0);
482 ASSERT(bip->bli_flags & XFS_BLI_HOLD);
483
484 bip->bli_flags &= ~XFS_BLI_HOLD;
485 trace_xfs_trans_bhold_release(bip);
486}
487
488/*
489 * This is called to mark bytes first through last inclusive of the given
490 * buffer as needing to be logged when the transaction is committed.
491 * The buffer must already be associated with the given transaction.
492 *
493 * First and last are numbers relative to the beginning of this buffer,
494 * so the first byte in the buffer is numbered 0 regardless of the
495 * value of b_blkno.
496 */
497void
498xfs_trans_log_buf(xfs_trans_t *tp,
499 xfs_buf_t *bp,
500 uint first,
501 uint last)
502{
503 xfs_buf_log_item_t *bip = bp->b_fspriv;
504
505 ASSERT(bp->b_transp == tp);
506 ASSERT(bip != NULL);
507 ASSERT(first <= last && last < BBTOB(bp->b_length));
508 ASSERT(bp->b_iodone == NULL ||
509 bp->b_iodone == xfs_buf_iodone_callbacks);
510
511 /*
512 * Mark the buffer as needing to be written out eventually,
513 * and set its iodone function to remove the buffer's buf log
514 * item from the AIL and free it when the buffer is flushed
515 * to disk. See xfs_buf_attach_iodone() for more details
516 * on li_cb and xfs_buf_iodone_callbacks().
517 * If we end up aborting this transaction, we trap this buffer
518 * inside the b_bdstrat callback so that this won't get written to
519 * disk.
520 */
521 bp->b_flags |= XBF_DONE;
522
523 ASSERT(atomic_read(&bip->bli_refcount) > 0);
524 bp->b_iodone = xfs_buf_iodone_callbacks;
525 bip->bli_item.li_cb = xfs_buf_iodone;
526
527 trace_xfs_trans_log_buf(bip);
528
529 /*
530 * If we invalidated the buffer within this transaction, then
531 * cancel the invalidation now that we're dirtying the buffer
532 * again. There are no races with the code in xfs_buf_item_unpin(),
533 * because we have a reference to the buffer this entire time.
534 */
535 if (bip->bli_flags & XFS_BLI_STALE) {
536 bip->bli_flags &= ~XFS_BLI_STALE;
537 ASSERT(bp->b_flags & XBF_STALE);
538 bp->b_flags &= ~XBF_STALE;
539 bip->__bli_format.blf_flags &= ~XFS_BLF_CANCEL;
540 }
541
542 tp->t_flags |= XFS_TRANS_DIRTY;
543 bip->bli_item.li_desc->lid_flags |= XFS_LID_DIRTY;
544
545 /*
546 * If we have an ordered buffer we are not logging any dirty range but
547 * it still needs to be marked dirty and that it has been logged.
548 */
549 bip->bli_flags |= XFS_BLI_DIRTY | XFS_BLI_LOGGED;
550 if (!(bip->bli_flags & XFS_BLI_ORDERED))
551 xfs_buf_item_log(bip, first, last);
552}
553
554
555/*
556 * Invalidate a buffer that is being used within a transaction.
557 *
558 * Typically this is because the blocks in the buffer are being freed, so we
559 * need to prevent it from being written out when we're done. Allowing it
560 * to be written again might overwrite data in the free blocks if they are
561 * reallocated to a file.
562 *
563 * We prevent the buffer from being written out by marking it stale. We can't
564 * get rid of the buf log item at this point because the buffer may still be
565 * pinned by another transaction. If that is the case, then we'll wait until
566 * the buffer is committed to disk for the last time (we can tell by the ref
567 * count) and free it in xfs_buf_item_unpin(). Until that happens we will
568 * keep the buffer locked so that the buffer and buf log item are not reused.
569 *
570 * We also set the XFS_BLF_CANCEL flag in the buf log format structure and log
571 * the buf item. This will be used at recovery time to determine that copies
572 * of the buffer in the log before this should not be replayed.
573 *
574 * We mark the item descriptor and the transaction dirty so that we'll hold
575 * the buffer until after the commit.
576 *
577 * Since we're invalidating the buffer, we also clear the state about which
578 * parts of the buffer have been logged. We also clear the flag indicating
579 * that this is an inode buffer since the data in the buffer will no longer
580 * be valid.
581 *
582 * We set the stale bit in the buffer as well since we're getting rid of it.
583 */
584void
585xfs_trans_binval(
586 xfs_trans_t *tp,
587 xfs_buf_t *bp)
588{
589 xfs_buf_log_item_t *bip = bp->b_fspriv;
590 int i;
591
592 ASSERT(bp->b_transp == tp);
593 ASSERT(bip != NULL);
594 ASSERT(atomic_read(&bip->bli_refcount) > 0);
595
596 trace_xfs_trans_binval(bip);
597
598 if (bip->bli_flags & XFS_BLI_STALE) {
599 /*
600 * If the buffer is already invalidated, then
601 * just return.
602 */
603 ASSERT(bp->b_flags & XBF_STALE);
604 ASSERT(!(bip->bli_flags & (XFS_BLI_LOGGED | XFS_BLI_DIRTY)));
605 ASSERT(!(bip->__bli_format.blf_flags & XFS_BLF_INODE_BUF));
606 ASSERT(!(bip->__bli_format.blf_flags & XFS_BLFT_MASK));
607 ASSERT(bip->__bli_format.blf_flags & XFS_BLF_CANCEL);
608 ASSERT(bip->bli_item.li_desc->lid_flags & XFS_LID_DIRTY);
609 ASSERT(tp->t_flags & XFS_TRANS_DIRTY);
610 return;
611 }
612
613 xfs_buf_stale(bp);
614
615 bip->bli_flags |= XFS_BLI_STALE;
616 bip->bli_flags &= ~(XFS_BLI_INODE_BUF | XFS_BLI_LOGGED | XFS_BLI_DIRTY);
617 bip->__bli_format.blf_flags &= ~XFS_BLF_INODE_BUF;
618 bip->__bli_format.blf_flags |= XFS_BLF_CANCEL;
619 bip->__bli_format.blf_flags &= ~XFS_BLFT_MASK;
620 for (i = 0; i < bip->bli_format_count; i++) {
621 memset(bip->bli_formats[i].blf_data_map, 0,
622 (bip->bli_formats[i].blf_map_size * sizeof(uint)));
623 }
624 bip->bli_item.li_desc->lid_flags |= XFS_LID_DIRTY;
625 tp->t_flags |= XFS_TRANS_DIRTY;
626}
627
628/*
629 * This call is used to indicate that the buffer contains on-disk inodes which
630 * must be handled specially during recovery. They require special handling
631 * because only the di_next_unlinked from the inodes in the buffer should be
632 * recovered. The rest of the data in the buffer is logged via the inodes
633 * themselves.
634 *
635 * All we do is set the XFS_BLI_INODE_BUF flag in the items flags so it can be
636 * transferred to the buffer's log format structure so that we'll know what to
637 * do at recovery time.
638 */
639void
640xfs_trans_inode_buf(
641 xfs_trans_t *tp,
642 xfs_buf_t *bp)
643{
644 xfs_buf_log_item_t *bip = bp->b_fspriv;
645
646 ASSERT(bp->b_transp == tp);
647 ASSERT(bip != NULL);
648 ASSERT(atomic_read(&bip->bli_refcount) > 0);
649
650 bip->bli_flags |= XFS_BLI_INODE_BUF;
651 xfs_trans_buf_set_type(tp, bp, XFS_BLFT_DINO_BUF);
652}
653
654/*
655 * This call is used to indicate that the buffer is going to
656 * be staled and was an inode buffer. This means it gets
657 * special processing during unpin - where any inodes
658 * associated with the buffer should be removed from ail.
659 * There is also special processing during recovery,
660 * any replay of the inodes in the buffer needs to be
661 * prevented as the buffer may have been reused.
662 */
663void
664xfs_trans_stale_inode_buf(
665 xfs_trans_t *tp,
666 xfs_buf_t *bp)
667{
668 xfs_buf_log_item_t *bip = bp->b_fspriv;
669
670 ASSERT(bp->b_transp == tp);
671 ASSERT(bip != NULL);
672 ASSERT(atomic_read(&bip->bli_refcount) > 0);
673
674 bip->bli_flags |= XFS_BLI_STALE_INODE;
675 bip->bli_item.li_cb = xfs_buf_iodone;
676 xfs_trans_buf_set_type(tp, bp, XFS_BLFT_DINO_BUF);
677}
678
679/*
680 * Mark the buffer as being one which contains newly allocated
681 * inodes. We need to make sure that even if this buffer is
682 * relogged as an 'inode buf' we still recover all of the inode
683 * images in the face of a crash. This works in coordination with
684 * xfs_buf_item_committed() to ensure that the buffer remains in the
685 * AIL at its original location even after it has been relogged.
686 */
687/* ARGSUSED */
688void
689xfs_trans_inode_alloc_buf(
690 xfs_trans_t *tp,
691 xfs_buf_t *bp)
692{
693 xfs_buf_log_item_t *bip = bp->b_fspriv;
694
695 ASSERT(bp->b_transp == tp);
696 ASSERT(bip != NULL);
697 ASSERT(atomic_read(&bip->bli_refcount) > 0);
698
699 bip->bli_flags |= XFS_BLI_INODE_ALLOC_BUF;
700 xfs_trans_buf_set_type(tp, bp, XFS_BLFT_DINO_BUF);
701}
702
703/*
704 * Mark the buffer as ordered for this transaction. This means
705 * that the contents of the buffer are not recorded in the transaction
706 * but it is tracked in the AIL as though it was. This allows us
707 * to record logical changes in transactions rather than the physical
708 * changes we make to the buffer without changing writeback ordering
709 * constraints of metadata buffers.
710 */
711void
712xfs_trans_ordered_buf(
713 struct xfs_trans *tp,
714 struct xfs_buf *bp)
715{
716 struct xfs_buf_log_item *bip = bp->b_fspriv;
717
718 ASSERT(bp->b_transp == tp);
719 ASSERT(bip != NULL);
720 ASSERT(atomic_read(&bip->bli_refcount) > 0);
721
722 bip->bli_flags |= XFS_BLI_ORDERED;
723 trace_xfs_buf_item_ordered(bip);
724}
725
726/*
727 * Set the type of the buffer for log recovery so that it can correctly identify
728 * and hence attach the correct buffer ops to the buffer after replay.
729 */
730void
731xfs_trans_buf_set_type(
732 struct xfs_trans *tp,
733 struct xfs_buf *bp,
734 enum xfs_blft type)
735{
736 struct xfs_buf_log_item *bip = bp->b_fspriv;
737
738 if (!tp)
739 return;
740
741 ASSERT(bp->b_transp == tp);
742 ASSERT(bip != NULL);
743 ASSERT(atomic_read(&bip->bli_refcount) > 0);
744
745 xfs_blft_to_flags(&bip->__bli_format, type);
746}
747
748void
749xfs_trans_buf_copy_type(
750 struct xfs_buf *dst_bp,
751 struct xfs_buf *src_bp)
752{
753 struct xfs_buf_log_item *sbip = src_bp->b_fspriv;
754 struct xfs_buf_log_item *dbip = dst_bp->b_fspriv;
755 enum xfs_blft type;
756
757 type = xfs_blft_from_flags(&sbip->__bli_format);
758 xfs_blft_to_flags(&dbip->__bli_format, type);
759}
760
761/*
762 * Similar to xfs_trans_inode_buf(), this marks the buffer as a cluster of
763 * dquots. However, unlike in inode buffer recovery, dquot buffers get
764 * recovered in their entirety. (Hence, no XFS_BLI_DQUOT_ALLOC_BUF flag).
765 * The only thing that makes dquot buffers different from regular
766 * buffers is that we must not replay dquot bufs when recovering
767 * if a _corresponding_ quotaoff has happened. We also have to distinguish
768 * between usr dquot bufs and grp dquot bufs, because usr and grp quotas
769 * can be turned off independently.
770 */
771/* ARGSUSED */
772void
773xfs_trans_dquot_buf(
774 xfs_trans_t *tp,
775 xfs_buf_t *bp,
776 uint type)
777{
778 struct xfs_buf_log_item *bip = bp->b_fspriv;
779
780 ASSERT(type == XFS_BLF_UDQUOT_BUF ||
781 type == XFS_BLF_PDQUOT_BUF ||
782 type == XFS_BLF_GDQUOT_BUF);
783
784 bip->__bli_format.blf_flags |= type;
785
786 switch (type) {
787 case XFS_BLF_UDQUOT_BUF:
788 type = XFS_BLFT_UDQUOT_BUF;
789 break;
790 case XFS_BLF_PDQUOT_BUF:
791 type = XFS_BLFT_PDQUOT_BUF;
792 break;
793 case XFS_BLF_GDQUOT_BUF:
794 type = XFS_BLFT_GDQUOT_BUF;
795 break;
796 default:
797 type = XFS_BLFT_UNKNOWN_BUF;
798 break;
799 }
800
801 xfs_trans_buf_set_type(tp, bp, type);
802}