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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}
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_ADDR(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 */
115struct xfs_buf *
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{
123 xfs_buf_t *bp;
124 struct xfs_buf_log_item *bip;
125
126 if (!tp)
127 return xfs_buf_get_map(target, map, nmaps, flags);
128
129 /*
130 * If we find the buffer in the cache with this transaction
131 * pointer in its b_fsprivate2 field, then we know we already
132 * have it locked. In this case we just increment the lock
133 * recursion count and return the buffer to the caller.
134 */
135 bp = xfs_trans_buf_item_match(tp, target, map, nmaps);
136 if (bp != NULL) {
137 ASSERT(xfs_buf_islocked(bp));
138 if (XFS_FORCED_SHUTDOWN(tp->t_mountp)) {
139 xfs_buf_stale(bp);
140 bp->b_flags |= XBF_DONE;
141 }
142
143 ASSERT(bp->b_transp == tp);
144 bip = bp->b_log_item;
145 ASSERT(bip != NULL);
146 ASSERT(atomic_read(&bip->bli_refcount) > 0);
147 bip->bli_recur++;
148 trace_xfs_trans_get_buf_recur(bip);
149 return bp;
150 }
151
152 bp = xfs_buf_get_map(target, map, nmaps, flags);
153 if (bp == NULL) {
154 return NULL;
155 }
156
157 ASSERT(!bp->b_error);
158
159 _xfs_trans_bjoin(tp, bp, 1);
160 trace_xfs_trans_get_buf(bp->b_log_item);
161 return bp;
162}
163
164/*
165 * Get and lock the superblock buffer of this file system for the
166 * given transaction.
167 *
168 * We don't need to use incore_match() here, because the superblock
169 * buffer is a private buffer which we keep a pointer to in the
170 * mount structure.
171 */
172xfs_buf_t *
173xfs_trans_getsb(
174 xfs_trans_t *tp,
175 struct xfs_mount *mp)
176{
177 xfs_buf_t *bp;
178 struct xfs_buf_log_item *bip;
179
180 /*
181 * Default to just trying to lock the superblock buffer
182 * if tp is NULL.
183 */
184 if (tp == NULL)
185 return xfs_getsb(mp);
186
187 /*
188 * If the superblock buffer already has this transaction
189 * pointer in its b_fsprivate2 field, then we know we already
190 * have it locked. In this case we just increment the lock
191 * recursion count and return the buffer to the caller.
192 */
193 bp = mp->m_sb_bp;
194 if (bp->b_transp == tp) {
195 bip = bp->b_log_item;
196 ASSERT(bip != NULL);
197 ASSERT(atomic_read(&bip->bli_refcount) > 0);
198 bip->bli_recur++;
199 trace_xfs_trans_getsb_recur(bip);
200 return bp;
201 }
202
203 bp = xfs_getsb(mp);
204 if (bp == NULL)
205 return NULL;
206
207 _xfs_trans_bjoin(tp, bp, 1);
208 trace_xfs_trans_getsb(bp->b_log_item);
209 return bp;
210}
211
212/*
213 * Get and lock the buffer for the caller if it is not already
214 * locked within the given transaction. If it has not yet been
215 * read in, read it from disk. If it is already locked
216 * within the transaction and already read in, just increment its
217 * lock recursion count and return a pointer to it.
218 *
219 * If the transaction pointer is NULL, make this just a normal
220 * read_buf() call.
221 */
222int
223xfs_trans_read_buf_map(
224 struct xfs_mount *mp,
225 struct xfs_trans *tp,
226 struct xfs_buftarg *target,
227 struct xfs_buf_map *map,
228 int nmaps,
229 xfs_buf_flags_t flags,
230 struct xfs_buf **bpp,
231 const struct xfs_buf_ops *ops)
232{
233 struct xfs_buf *bp = NULL;
234 struct xfs_buf_log_item *bip;
235 int error;
236
237 *bpp = NULL;
238 /*
239 * If we find the buffer in the cache with this transaction
240 * pointer in its b_fsprivate2 field, then we know we already
241 * have it locked. If it is already read in we just increment
242 * the lock recursion count and return the buffer to the caller.
243 * If the buffer is not yet read in, then we read it in, increment
244 * the lock recursion count, and return it to the caller.
245 */
246 if (tp)
247 bp = xfs_trans_buf_item_match(tp, target, map, nmaps);
248 if (bp) {
249 ASSERT(xfs_buf_islocked(bp));
250 ASSERT(bp->b_transp == tp);
251 ASSERT(bp->b_log_item != NULL);
252 ASSERT(!bp->b_error);
253 ASSERT(bp->b_flags & XBF_DONE);
254
255 /*
256 * We never locked this buf ourselves, so we shouldn't
257 * brelse it either. Just get out.
258 */
259 if (XFS_FORCED_SHUTDOWN(mp)) {
260 trace_xfs_trans_read_buf_shut(bp, _RET_IP_);
261 return -EIO;
262 }
263
264 /*
265 * Check if the caller is trying to read a buffer that is
266 * already attached to the transaction yet has no buffer ops
267 * assigned. Ops are usually attached when the buffer is
268 * attached to the transaction, or by the read caller if
269 * special circumstances. That didn't happen, which is not
270 * how this is supposed to go.
271 *
272 * If the buffer passes verification we'll let this go, but if
273 * not we have to shut down. Let the transaction cleanup code
274 * release this buffer when it kills the tranaction.
275 */
276 ASSERT(bp->b_ops != NULL);
277 error = xfs_buf_reverify(bp, ops);
278 if (error) {
279 xfs_buf_ioerror_alert(bp, __func__);
280
281 if (tp->t_flags & XFS_TRANS_DIRTY)
282 xfs_force_shutdown(tp->t_mountp,
283 SHUTDOWN_META_IO_ERROR);
284
285 /* bad CRC means corrupted metadata */
286 if (error == -EFSBADCRC)
287 error = -EFSCORRUPTED;
288 return error;
289 }
290
291 bip = bp->b_log_item;
292 bip->bli_recur++;
293
294 ASSERT(atomic_read(&bip->bli_refcount) > 0);
295 trace_xfs_trans_read_buf_recur(bip);
296 ASSERT(bp->b_ops != NULL || ops == NULL);
297 *bpp = bp;
298 return 0;
299 }
300
301 bp = xfs_buf_read_map(target, map, nmaps, flags, ops);
302 if (!bp) {
303 if (!(flags & XBF_TRYLOCK))
304 return -ENOMEM;
305 return tp ? 0 : -EAGAIN;
306 }
307
308 /*
309 * If we've had a read error, then the contents of the buffer are
310 * invalid and should not be used. To ensure that a followup read tries
311 * to pull the buffer from disk again, we clear the XBF_DONE flag and
312 * mark the buffer stale. This ensures that anyone who has a current
313 * reference to the buffer will interpret it's contents correctly and
314 * future cache lookups will also treat it as an empty, uninitialised
315 * buffer.
316 */
317 if (bp->b_error) {
318 error = bp->b_error;
319 if (!XFS_FORCED_SHUTDOWN(mp))
320 xfs_buf_ioerror_alert(bp, __func__);
321 bp->b_flags &= ~XBF_DONE;
322 xfs_buf_stale(bp);
323
324 if (tp && (tp->t_flags & XFS_TRANS_DIRTY))
325 xfs_force_shutdown(tp->t_mountp, SHUTDOWN_META_IO_ERROR);
326 xfs_buf_relse(bp);
327
328 /* bad CRC means corrupted metadata */
329 if (error == -EFSBADCRC)
330 error = -EFSCORRUPTED;
331 return error;
332 }
333
334 if (XFS_FORCED_SHUTDOWN(mp)) {
335 xfs_buf_relse(bp);
336 trace_xfs_trans_read_buf_shut(bp, _RET_IP_);
337 return -EIO;
338 }
339
340 if (tp) {
341 _xfs_trans_bjoin(tp, bp, 1);
342 trace_xfs_trans_read_buf(bp->b_log_item);
343 }
344 ASSERT(bp->b_ops != NULL || ops == NULL);
345 *bpp = bp;
346 return 0;
347
348}
349
350/* Has this buffer been dirtied by anyone? */
351bool
352xfs_trans_buf_is_dirty(
353 struct xfs_buf *bp)
354{
355 struct xfs_buf_log_item *bip = bp->b_log_item;
356
357 if (!bip)
358 return false;
359 ASSERT(bip->bli_item.li_type == XFS_LI_BUF);
360 return test_bit(XFS_LI_DIRTY, &bip->bli_item.li_flags);
361}
362
363/*
364 * Release a buffer previously joined to the transaction. If the buffer is
365 * modified within this transaction, decrement the recursion count but do not
366 * release the buffer even if the count goes to 0. If the buffer is not modified
367 * within the transaction, decrement the recursion count and release the buffer
368 * if the recursion count goes to 0.
369 *
370 * If the buffer is to be released and it was not already dirty before this
371 * transaction began, then also free the buf_log_item associated with it.
372 *
373 * If the transaction pointer is NULL, this is a normal xfs_buf_relse() call.
374 */
375void
376xfs_trans_brelse(
377 struct xfs_trans *tp,
378 struct xfs_buf *bp)
379{
380 struct xfs_buf_log_item *bip = bp->b_log_item;
381
382 ASSERT(bp->b_transp == tp);
383
384 if (!tp) {
385 xfs_buf_relse(bp);
386 return;
387 }
388
389 trace_xfs_trans_brelse(bip);
390 ASSERT(bip->bli_item.li_type == XFS_LI_BUF);
391 ASSERT(atomic_read(&bip->bli_refcount) > 0);
392
393 /*
394 * If the release is for a recursive lookup, then decrement the count
395 * and return.
396 */
397 if (bip->bli_recur > 0) {
398 bip->bli_recur--;
399 return;
400 }
401
402 /*
403 * If the buffer is invalidated or dirty in this transaction, we can't
404 * release it until we commit.
405 */
406 if (test_bit(XFS_LI_DIRTY, &bip->bli_item.li_flags))
407 return;
408 if (bip->bli_flags & XFS_BLI_STALE)
409 return;
410
411 /*
412 * Unlink the log item from the transaction and clear the hold flag, if
413 * set. We wouldn't want the next user of the buffer to get confused.
414 */
415 ASSERT(!(bip->bli_flags & XFS_BLI_LOGGED));
416 xfs_trans_del_item(&bip->bli_item);
417 bip->bli_flags &= ~XFS_BLI_HOLD;
418
419 /* drop the reference to the bli */
420 xfs_buf_item_put(bip);
421
422 bp->b_transp = NULL;
423 xfs_buf_relse(bp);
424}
425
426/*
427 * Mark the buffer as not needing to be unlocked when the buf item's
428 * iop_committing() routine is called. The buffer must already be locked
429 * and associated with the given transaction.
430 */
431/* ARGSUSED */
432void
433xfs_trans_bhold(
434 xfs_trans_t *tp,
435 xfs_buf_t *bp)
436{
437 struct xfs_buf_log_item *bip = bp->b_log_item;
438
439 ASSERT(bp->b_transp == tp);
440 ASSERT(bip != NULL);
441 ASSERT(!(bip->bli_flags & XFS_BLI_STALE));
442 ASSERT(!(bip->__bli_format.blf_flags & XFS_BLF_CANCEL));
443 ASSERT(atomic_read(&bip->bli_refcount) > 0);
444
445 bip->bli_flags |= XFS_BLI_HOLD;
446 trace_xfs_trans_bhold(bip);
447}
448
449/*
450 * Cancel the previous buffer hold request made on this buffer
451 * for this transaction.
452 */
453void
454xfs_trans_bhold_release(
455 xfs_trans_t *tp,
456 xfs_buf_t *bp)
457{
458 struct xfs_buf_log_item *bip = bp->b_log_item;
459
460 ASSERT(bp->b_transp == tp);
461 ASSERT(bip != NULL);
462 ASSERT(!(bip->bli_flags & XFS_BLI_STALE));
463 ASSERT(!(bip->__bli_format.blf_flags & XFS_BLF_CANCEL));
464 ASSERT(atomic_read(&bip->bli_refcount) > 0);
465 ASSERT(bip->bli_flags & XFS_BLI_HOLD);
466
467 bip->bli_flags &= ~XFS_BLI_HOLD;
468 trace_xfs_trans_bhold_release(bip);
469}
470
471/*
472 * Mark a buffer dirty in the transaction.
473 */
474void
475xfs_trans_dirty_buf(
476 struct xfs_trans *tp,
477 struct xfs_buf *bp)
478{
479 struct xfs_buf_log_item *bip = bp->b_log_item;
480
481 ASSERT(bp->b_transp == tp);
482 ASSERT(bip != NULL);
483 ASSERT(bp->b_iodone == NULL ||
484 bp->b_iodone == xfs_buf_iodone_callbacks);
485
486 /*
487 * Mark the buffer as needing to be written out eventually,
488 * and set its iodone function to remove the buffer's buf log
489 * item from the AIL and free it when the buffer is flushed
490 * to disk. See xfs_buf_attach_iodone() for more details
491 * on li_cb and xfs_buf_iodone_callbacks().
492 * If we end up aborting this transaction, we trap this buffer
493 * inside the b_bdstrat callback so that this won't get written to
494 * disk.
495 */
496 bp->b_flags |= XBF_DONE;
497
498 ASSERT(atomic_read(&bip->bli_refcount) > 0);
499 bp->b_iodone = xfs_buf_iodone_callbacks;
500 bip->bli_item.li_cb = xfs_buf_iodone;
501
502 /*
503 * If we invalidated the buffer within this transaction, then
504 * cancel the invalidation now that we're dirtying the buffer
505 * again. There are no races with the code in xfs_buf_item_unpin(),
506 * because we have a reference to the buffer this entire time.
507 */
508 if (bip->bli_flags & XFS_BLI_STALE) {
509 bip->bli_flags &= ~XFS_BLI_STALE;
510 ASSERT(bp->b_flags & XBF_STALE);
511 bp->b_flags &= ~XBF_STALE;
512 bip->__bli_format.blf_flags &= ~XFS_BLF_CANCEL;
513 }
514 bip->bli_flags |= XFS_BLI_DIRTY | XFS_BLI_LOGGED;
515
516 tp->t_flags |= XFS_TRANS_DIRTY;
517 set_bit(XFS_LI_DIRTY, &bip->bli_item.li_flags);
518}
519
520/*
521 * This is called to mark bytes first through last inclusive of the given
522 * buffer as needing to be logged when the transaction is committed.
523 * The buffer must already be associated with the given transaction.
524 *
525 * First and last are numbers relative to the beginning of this buffer,
526 * so the first byte in the buffer is numbered 0 regardless of the
527 * value of b_blkno.
528 */
529void
530xfs_trans_log_buf(
531 struct xfs_trans *tp,
532 struct xfs_buf *bp,
533 uint first,
534 uint last)
535{
536 struct xfs_buf_log_item *bip = bp->b_log_item;
537
538 ASSERT(first <= last && last < BBTOB(bp->b_length));
539 ASSERT(!(bip->bli_flags & XFS_BLI_ORDERED));
540
541 xfs_trans_dirty_buf(tp, bp);
542
543 trace_xfs_trans_log_buf(bip);
544 xfs_buf_item_log(bip, first, last);
545}
546
547
548/*
549 * Invalidate a buffer that is being used within a transaction.
550 *
551 * Typically this is because the blocks in the buffer are being freed, so we
552 * need to prevent it from being written out when we're done. Allowing it
553 * to be written again might overwrite data in the free blocks if they are
554 * reallocated to a file.
555 *
556 * We prevent the buffer from being written out by marking it stale. We can't
557 * get rid of the buf log item at this point because the buffer may still be
558 * pinned by another transaction. If that is the case, then we'll wait until
559 * the buffer is committed to disk for the last time (we can tell by the ref
560 * count) and free it in xfs_buf_item_unpin(). Until that happens we will
561 * keep the buffer locked so that the buffer and buf log item are not reused.
562 *
563 * We also set the XFS_BLF_CANCEL flag in the buf log format structure and log
564 * the buf item. This will be used at recovery time to determine that copies
565 * of the buffer in the log before this should not be replayed.
566 *
567 * We mark the item descriptor and the transaction dirty so that we'll hold
568 * the buffer until after the commit.
569 *
570 * Since we're invalidating the buffer, we also clear the state about which
571 * parts of the buffer have been logged. We also clear the flag indicating
572 * that this is an inode buffer since the data in the buffer will no longer
573 * be valid.
574 *
575 * We set the stale bit in the buffer as well since we're getting rid of it.
576 */
577void
578xfs_trans_binval(
579 xfs_trans_t *tp,
580 xfs_buf_t *bp)
581{
582 struct xfs_buf_log_item *bip = bp->b_log_item;
583 int i;
584
585 ASSERT(bp->b_transp == tp);
586 ASSERT(bip != NULL);
587 ASSERT(atomic_read(&bip->bli_refcount) > 0);
588
589 trace_xfs_trans_binval(bip);
590
591 if (bip->bli_flags & XFS_BLI_STALE) {
592 /*
593 * If the buffer is already invalidated, then
594 * just return.
595 */
596 ASSERT(bp->b_flags & XBF_STALE);
597 ASSERT(!(bip->bli_flags & (XFS_BLI_LOGGED | XFS_BLI_DIRTY)));
598 ASSERT(!(bip->__bli_format.blf_flags & XFS_BLF_INODE_BUF));
599 ASSERT(!(bip->__bli_format.blf_flags & XFS_BLFT_MASK));
600 ASSERT(bip->__bli_format.blf_flags & XFS_BLF_CANCEL);
601 ASSERT(test_bit(XFS_LI_DIRTY, &bip->bli_item.li_flags));
602 ASSERT(tp->t_flags & XFS_TRANS_DIRTY);
603 return;
604 }
605
606 xfs_buf_stale(bp);
607
608 bip->bli_flags |= XFS_BLI_STALE;
609 bip->bli_flags &= ~(XFS_BLI_INODE_BUF | XFS_BLI_LOGGED | XFS_BLI_DIRTY);
610 bip->__bli_format.blf_flags &= ~XFS_BLF_INODE_BUF;
611 bip->__bli_format.blf_flags |= XFS_BLF_CANCEL;
612 bip->__bli_format.blf_flags &= ~XFS_BLFT_MASK;
613 for (i = 0; i < bip->bli_format_count; i++) {
614 memset(bip->bli_formats[i].blf_data_map, 0,
615 (bip->bli_formats[i].blf_map_size * sizeof(uint)));
616 }
617 set_bit(XFS_LI_DIRTY, &bip->bli_item.li_flags);
618 tp->t_flags |= XFS_TRANS_DIRTY;
619}
620
621/*
622 * This call is used to indicate that the buffer contains on-disk inodes which
623 * must be handled specially during recovery. They require special handling
624 * because only the di_next_unlinked from the inodes in the buffer should be
625 * recovered. The rest of the data in the buffer is logged via the inodes
626 * themselves.
627 *
628 * All we do is set the XFS_BLI_INODE_BUF flag in the items flags so it can be
629 * transferred to the buffer's log format structure so that we'll know what to
630 * do at recovery time.
631 */
632void
633xfs_trans_inode_buf(
634 xfs_trans_t *tp,
635 xfs_buf_t *bp)
636{
637 struct xfs_buf_log_item *bip = bp->b_log_item;
638
639 ASSERT(bp->b_transp == tp);
640 ASSERT(bip != NULL);
641 ASSERT(atomic_read(&bip->bli_refcount) > 0);
642
643 bip->bli_flags |= XFS_BLI_INODE_BUF;
644 xfs_trans_buf_set_type(tp, bp, XFS_BLFT_DINO_BUF);
645}
646
647/*
648 * This call is used to indicate that the buffer is going to
649 * be staled and was an inode buffer. This means it gets
650 * special processing during unpin - where any inodes
651 * associated with the buffer should be removed from ail.
652 * There is also special processing during recovery,
653 * any replay of the inodes in the buffer needs to be
654 * prevented as the buffer may have been reused.
655 */
656void
657xfs_trans_stale_inode_buf(
658 xfs_trans_t *tp,
659 xfs_buf_t *bp)
660{
661 struct xfs_buf_log_item *bip = bp->b_log_item;
662
663 ASSERT(bp->b_transp == tp);
664 ASSERT(bip != NULL);
665 ASSERT(atomic_read(&bip->bli_refcount) > 0);
666
667 bip->bli_flags |= XFS_BLI_STALE_INODE;
668 bip->bli_item.li_cb = xfs_buf_iodone;
669 xfs_trans_buf_set_type(tp, bp, XFS_BLFT_DINO_BUF);
670}
671
672/*
673 * Mark the buffer as being one which contains newly allocated
674 * inodes. We need to make sure that even if this buffer is
675 * relogged as an 'inode buf' we still recover all of the inode
676 * images in the face of a crash. This works in coordination with
677 * xfs_buf_item_committed() to ensure that the buffer remains in the
678 * AIL at its original location even after it has been relogged.
679 */
680/* ARGSUSED */
681void
682xfs_trans_inode_alloc_buf(
683 xfs_trans_t *tp,
684 xfs_buf_t *bp)
685{
686 struct xfs_buf_log_item *bip = bp->b_log_item;
687
688 ASSERT(bp->b_transp == tp);
689 ASSERT(bip != NULL);
690 ASSERT(atomic_read(&bip->bli_refcount) > 0);
691
692 bip->bli_flags |= XFS_BLI_INODE_ALLOC_BUF;
693 xfs_trans_buf_set_type(tp, bp, XFS_BLFT_DINO_BUF);
694}
695
696/*
697 * Mark the buffer as ordered for this transaction. This means that the contents
698 * of the buffer are not recorded in the transaction but it is tracked in the
699 * AIL as though it was. This allows us to record logical changes in
700 * transactions rather than the physical changes we make to the buffer without
701 * changing writeback ordering constraints of metadata buffers.
702 */
703bool
704xfs_trans_ordered_buf(
705 struct xfs_trans *tp,
706 struct xfs_buf *bp)
707{
708 struct xfs_buf_log_item *bip = bp->b_log_item;
709
710 ASSERT(bp->b_transp == tp);
711 ASSERT(bip != NULL);
712 ASSERT(atomic_read(&bip->bli_refcount) > 0);
713
714 if (xfs_buf_item_dirty_format(bip))
715 return false;
716
717 bip->bli_flags |= XFS_BLI_ORDERED;
718 trace_xfs_buf_item_ordered(bip);
719
720 /*
721 * We don't log a dirty range of an ordered buffer but it still needs
722 * to be marked dirty and that it has been logged.
723 */
724 xfs_trans_dirty_buf(tp, bp);
725 return true;
726}
727
728/*
729 * Set the type of the buffer for log recovery so that it can correctly identify
730 * and hence attach the correct buffer ops to the buffer after replay.
731 */
732void
733xfs_trans_buf_set_type(
734 struct xfs_trans *tp,
735 struct xfs_buf *bp,
736 enum xfs_blft type)
737{
738 struct xfs_buf_log_item *bip = bp->b_log_item;
739
740 if (!tp)
741 return;
742
743 ASSERT(bp->b_transp == tp);
744 ASSERT(bip != NULL);
745 ASSERT(atomic_read(&bip->bli_refcount) > 0);
746
747 xfs_blft_to_flags(&bip->__bli_format, type);
748}
749
750void
751xfs_trans_buf_copy_type(
752 struct xfs_buf *dst_bp,
753 struct xfs_buf *src_bp)
754{
755 struct xfs_buf_log_item *sbip = src_bp->b_log_item;
756 struct xfs_buf_log_item *dbip = dst_bp->b_log_item;
757 enum xfs_blft type;
758
759 type = xfs_blft_from_flags(&sbip->__bli_format);
760 xfs_blft_to_flags(&dbip->__bli_format, type);
761}
762
763/*
764 * Similar to xfs_trans_inode_buf(), this marks the buffer as a cluster of
765 * dquots. However, unlike in inode buffer recovery, dquot buffers get
766 * recovered in their entirety. (Hence, no XFS_BLI_DQUOT_ALLOC_BUF flag).
767 * The only thing that makes dquot buffers different from regular
768 * buffers is that we must not replay dquot bufs when recovering
769 * if a _corresponding_ quotaoff has happened. We also have to distinguish
770 * between usr dquot bufs and grp dquot bufs, because usr and grp quotas
771 * can be turned off independently.
772 */
773/* ARGSUSED */
774void
775xfs_trans_dquot_buf(
776 xfs_trans_t *tp,
777 xfs_buf_t *bp,
778 uint type)
779{
780 struct xfs_buf_log_item *bip = bp->b_log_item;
781
782 ASSERT(type == XFS_BLF_UDQUOT_BUF ||
783 type == XFS_BLF_PDQUOT_BUF ||
784 type == XFS_BLF_GDQUOT_BUF);
785
786 bip->__bli_format.blf_flags |= type;
787
788 switch (type) {
789 case XFS_BLF_UDQUOT_BUF:
790 type = XFS_BLFT_UDQUOT_BUF;
791 break;
792 case XFS_BLF_PDQUOT_BUF:
793 type = XFS_BLFT_PDQUOT_BUF;
794 break;
795 case XFS_BLF_GDQUOT_BUF:
796 type = XFS_BLFT_GDQUOT_BUF;
797 break;
798 default:
799 type = XFS_BLFT_UNKNOWN_BUF;
800 break;
801 }
802
803 xfs_trans_buf_set_type(tp, bp, type);
804}