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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_log_item. 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_log_item;
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_log_item);
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 struct xfs_buf_log_item *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_log_item;
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_log_item);
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(
192 xfs_trans_t *tp,
193 struct xfs_mount *mp,
194 int flags)
195{
196 xfs_buf_t *bp;
197 struct xfs_buf_log_item *bip;
198
199 /*
200 * Default to just trying to lock the superblock buffer
201 * if tp is NULL.
202 */
203 if (tp == NULL)
204 return xfs_getsb(mp, flags);
205
206 /*
207 * If the superblock buffer already has this transaction
208 * pointer in its b_fsprivate2 field, then we know we already
209 * have it locked. In this case we just increment the lock
210 * recursion count and return the buffer to the caller.
211 */
212 bp = mp->m_sb_bp;
213 if (bp->b_transp == tp) {
214 bip = bp->b_log_item;
215 ASSERT(bip != NULL);
216 ASSERT(atomic_read(&bip->bli_refcount) > 0);
217 bip->bli_recur++;
218 trace_xfs_trans_getsb_recur(bip);
219 return bp;
220 }
221
222 bp = xfs_getsb(mp, flags);
223 if (bp == NULL)
224 return NULL;
225
226 _xfs_trans_bjoin(tp, bp, 1);
227 trace_xfs_trans_getsb(bp->b_log_item);
228 return bp;
229}
230
231/*
232 * Get and lock the buffer for the caller if it is not already
233 * locked within the given transaction. If it has not yet been
234 * read in, read it from disk. If it is already locked
235 * within the transaction and already read in, just increment its
236 * lock recursion count and return a pointer to it.
237 *
238 * If the transaction pointer is NULL, make this just a normal
239 * read_buf() call.
240 */
241int
242xfs_trans_read_buf_map(
243 struct xfs_mount *mp,
244 struct xfs_trans *tp,
245 struct xfs_buftarg *target,
246 struct xfs_buf_map *map,
247 int nmaps,
248 xfs_buf_flags_t flags,
249 struct xfs_buf **bpp,
250 const struct xfs_buf_ops *ops)
251{
252 struct xfs_buf *bp = NULL;
253 struct xfs_buf_log_item *bip;
254 int error;
255
256 *bpp = NULL;
257 /*
258 * If we find the buffer in the cache with this transaction
259 * pointer in its b_fsprivate2 field, then we know we already
260 * have it locked. If it is already read in we just increment
261 * the lock recursion count and return the buffer to the caller.
262 * If the buffer is not yet read in, then we read it in, increment
263 * the lock recursion count, and return it to the caller.
264 */
265 if (tp)
266 bp = xfs_trans_buf_item_match(tp, target, map, nmaps);
267 if (bp) {
268 ASSERT(xfs_buf_islocked(bp));
269 ASSERT(bp->b_transp == tp);
270 ASSERT(bp->b_log_item != NULL);
271 ASSERT(!bp->b_error);
272 ASSERT(bp->b_flags & XBF_DONE);
273
274 /*
275 * We never locked this buf ourselves, so we shouldn't
276 * brelse it either. Just get out.
277 */
278 if (XFS_FORCED_SHUTDOWN(mp)) {
279 trace_xfs_trans_read_buf_shut(bp, _RET_IP_);
280 return -EIO;
281 }
282
283 bip = bp->b_log_item;
284 bip->bli_recur++;
285
286 ASSERT(atomic_read(&bip->bli_refcount) > 0);
287 trace_xfs_trans_read_buf_recur(bip);
288 *bpp = bp;
289 return 0;
290 }
291
292 bp = xfs_buf_read_map(target, map, nmaps, flags, ops);
293 if (!bp) {
294 if (!(flags & XBF_TRYLOCK))
295 return -ENOMEM;
296 return tp ? 0 : -EAGAIN;
297 }
298
299 /*
300 * If we've had a read error, then the contents of the buffer are
301 * invalid and should not be used. To ensure that a followup read tries
302 * to pull the buffer from disk again, we clear the XBF_DONE flag and
303 * mark the buffer stale. This ensures that anyone who has a current
304 * reference to the buffer will interpret it's contents correctly and
305 * future cache lookups will also treat it as an empty, uninitialised
306 * buffer.
307 */
308 if (bp->b_error) {
309 error = bp->b_error;
310 if (!XFS_FORCED_SHUTDOWN(mp))
311 xfs_buf_ioerror_alert(bp, __func__);
312 bp->b_flags &= ~XBF_DONE;
313 xfs_buf_stale(bp);
314
315 if (tp && (tp->t_flags & XFS_TRANS_DIRTY))
316 xfs_force_shutdown(tp->t_mountp, SHUTDOWN_META_IO_ERROR);
317 xfs_buf_relse(bp);
318
319 /* bad CRC means corrupted metadata */
320 if (error == -EFSBADCRC)
321 error = -EFSCORRUPTED;
322 return error;
323 }
324
325 if (XFS_FORCED_SHUTDOWN(mp)) {
326 xfs_buf_relse(bp);
327 trace_xfs_trans_read_buf_shut(bp, _RET_IP_);
328 return -EIO;
329 }
330
331 if (tp) {
332 _xfs_trans_bjoin(tp, bp, 1);
333 trace_xfs_trans_read_buf(bp->b_log_item);
334 }
335 *bpp = bp;
336 return 0;
337
338}
339
340/*
341 * Release the buffer bp which was previously acquired with one of the
342 * xfs_trans_... buffer allocation routines if the buffer has not
343 * been modified within this transaction. If the buffer is modified
344 * within this transaction, do decrement the recursion count but do
345 * not release the buffer even if the count goes to 0. If the buffer is not
346 * modified within the transaction, decrement the recursion count and
347 * release the buffer if the recursion count goes to 0.
348 *
349 * If the buffer is to be released and it was not modified before
350 * this transaction began, then free the buf_log_item associated with it.
351 *
352 * If the transaction pointer is NULL, make this just a normal
353 * brelse() call.
354 */
355void
356xfs_trans_brelse(
357 xfs_trans_t *tp,
358 xfs_buf_t *bp)
359{
360 struct xfs_buf_log_item *bip;
361 int freed;
362
363 /*
364 * Default to a normal brelse() call if the tp is NULL.
365 */
366 if (tp == NULL) {
367 ASSERT(bp->b_transp == NULL);
368 xfs_buf_relse(bp);
369 return;
370 }
371
372 ASSERT(bp->b_transp == tp);
373 bip = bp->b_log_item;
374 ASSERT(bip->bli_item.li_type == XFS_LI_BUF);
375 ASSERT(!(bip->bli_flags & XFS_BLI_STALE));
376 ASSERT(!(bip->__bli_format.blf_flags & XFS_BLF_CANCEL));
377 ASSERT(atomic_read(&bip->bli_refcount) > 0);
378
379 trace_xfs_trans_brelse(bip);
380
381 /*
382 * If the release is just for a recursive lock,
383 * then decrement the count and return.
384 */
385 if (bip->bli_recur > 0) {
386 bip->bli_recur--;
387 return;
388 }
389
390 /*
391 * If the buffer is dirty within this transaction, we can't
392 * release it until we commit.
393 */
394 if (bip->bli_item.li_desc->lid_flags & XFS_LID_DIRTY)
395 return;
396
397 /*
398 * If the buffer has been invalidated, then we can't release
399 * it until the transaction commits to disk unless it is re-dirtied
400 * as part of this transaction. This prevents us from pulling
401 * the item from the AIL before we should.
402 */
403 if (bip->bli_flags & XFS_BLI_STALE)
404 return;
405
406 ASSERT(!(bip->bli_flags & XFS_BLI_LOGGED));
407
408 /*
409 * Free up the log item descriptor tracking the released item.
410 */
411 xfs_trans_del_item(&bip->bli_item);
412
413 /*
414 * Clear the hold flag in the buf log item if it is set.
415 * We wouldn't want the next user of the buffer to
416 * get confused.
417 */
418 if (bip->bli_flags & XFS_BLI_HOLD) {
419 bip->bli_flags &= ~XFS_BLI_HOLD;
420 }
421
422 /*
423 * Drop our reference to the buf log item.
424 */
425 freed = atomic_dec_and_test(&bip->bli_refcount);
426
427 /*
428 * If the buf item is not tracking data in the log, then we must free it
429 * before releasing the buffer back to the free pool.
430 *
431 * If the fs has shutdown and we dropped the last reference, it may fall
432 * on us to release a (possibly dirty) bli if it never made it to the
433 * AIL (e.g., the aborted unpin already happened and didn't release it
434 * due to our reference). Since we're already shutdown and need
435 * ail_lock, just force remove from the AIL and release the bli here.
436 */
437 if (XFS_FORCED_SHUTDOWN(tp->t_mountp) && freed) {
438 xfs_trans_ail_remove(&bip->bli_item, SHUTDOWN_LOG_IO_ERROR);
439 xfs_buf_item_relse(bp);
440 } else if (!(bip->bli_flags & XFS_BLI_DIRTY)) {
441/***
442 ASSERT(bp->b_pincount == 0);
443***/
444 ASSERT(atomic_read(&bip->bli_refcount) == 0);
445 ASSERT(!(bip->bli_item.li_flags & XFS_LI_IN_AIL));
446 ASSERT(!(bip->bli_flags & XFS_BLI_INODE_ALLOC_BUF));
447 xfs_buf_item_relse(bp);
448 }
449
450 bp->b_transp = NULL;
451 xfs_buf_relse(bp);
452}
453
454/*
455 * Mark the buffer as not needing to be unlocked when the buf item's
456 * iop_unlock() routine is called. The buffer must already be locked
457 * and associated with the given transaction.
458 */
459/* ARGSUSED */
460void
461xfs_trans_bhold(
462 xfs_trans_t *tp,
463 xfs_buf_t *bp)
464{
465 struct xfs_buf_log_item *bip = bp->b_log_item;
466
467 ASSERT(bp->b_transp == tp);
468 ASSERT(bip != NULL);
469 ASSERT(!(bip->bli_flags & XFS_BLI_STALE));
470 ASSERT(!(bip->__bli_format.blf_flags & XFS_BLF_CANCEL));
471 ASSERT(atomic_read(&bip->bli_refcount) > 0);
472
473 bip->bli_flags |= XFS_BLI_HOLD;
474 trace_xfs_trans_bhold(bip);
475}
476
477/*
478 * Cancel the previous buffer hold request made on this buffer
479 * for this transaction.
480 */
481void
482xfs_trans_bhold_release(
483 xfs_trans_t *tp,
484 xfs_buf_t *bp)
485{
486 struct xfs_buf_log_item *bip = bp->b_log_item;
487
488 ASSERT(bp->b_transp == tp);
489 ASSERT(bip != NULL);
490 ASSERT(!(bip->bli_flags & XFS_BLI_STALE));
491 ASSERT(!(bip->__bli_format.blf_flags & XFS_BLF_CANCEL));
492 ASSERT(atomic_read(&bip->bli_refcount) > 0);
493 ASSERT(bip->bli_flags & XFS_BLI_HOLD);
494
495 bip->bli_flags &= ~XFS_BLI_HOLD;
496 trace_xfs_trans_bhold_release(bip);
497}
498
499/*
500 * Mark a buffer dirty in the transaction.
501 */
502void
503xfs_trans_dirty_buf(
504 struct xfs_trans *tp,
505 struct xfs_buf *bp)
506{
507 struct xfs_buf_log_item *bip = bp->b_log_item;
508
509 ASSERT(bp->b_transp == tp);
510 ASSERT(bip != NULL);
511 ASSERT(bp->b_iodone == NULL ||
512 bp->b_iodone == xfs_buf_iodone_callbacks);
513
514 /*
515 * Mark the buffer as needing to be written out eventually,
516 * and set its iodone function to remove the buffer's buf log
517 * item from the AIL and free it when the buffer is flushed
518 * to disk. See xfs_buf_attach_iodone() for more details
519 * on li_cb and xfs_buf_iodone_callbacks().
520 * If we end up aborting this transaction, we trap this buffer
521 * inside the b_bdstrat callback so that this won't get written to
522 * disk.
523 */
524 bp->b_flags |= XBF_DONE;
525
526 ASSERT(atomic_read(&bip->bli_refcount) > 0);
527 bp->b_iodone = xfs_buf_iodone_callbacks;
528 bip->bli_item.li_cb = xfs_buf_iodone;
529
530 /*
531 * If we invalidated the buffer within this transaction, then
532 * cancel the invalidation now that we're dirtying the buffer
533 * again. There are no races with the code in xfs_buf_item_unpin(),
534 * because we have a reference to the buffer this entire time.
535 */
536 if (bip->bli_flags & XFS_BLI_STALE) {
537 bip->bli_flags &= ~XFS_BLI_STALE;
538 ASSERT(bp->b_flags & XBF_STALE);
539 bp->b_flags &= ~XBF_STALE;
540 bip->__bli_format.blf_flags &= ~XFS_BLF_CANCEL;
541 }
542 bip->bli_flags |= XFS_BLI_DIRTY | XFS_BLI_LOGGED;
543
544 tp->t_flags |= XFS_TRANS_DIRTY;
545 bip->bli_item.li_desc->lid_flags |= XFS_LID_DIRTY;
546}
547
548/*
549 * This is called to mark bytes first through last inclusive of the given
550 * buffer as needing to be logged when the transaction is committed.
551 * The buffer must already be associated with the given transaction.
552 *
553 * First and last are numbers relative to the beginning of this buffer,
554 * so the first byte in the buffer is numbered 0 regardless of the
555 * value of b_blkno.
556 */
557void
558xfs_trans_log_buf(
559 struct xfs_trans *tp,
560 struct xfs_buf *bp,
561 uint first,
562 uint last)
563{
564 struct xfs_buf_log_item *bip = bp->b_log_item;
565
566 ASSERT(first <= last && last < BBTOB(bp->b_length));
567 ASSERT(!(bip->bli_flags & XFS_BLI_ORDERED));
568
569 xfs_trans_dirty_buf(tp, bp);
570
571 trace_xfs_trans_log_buf(bip);
572 xfs_buf_item_log(bip, first, last);
573}
574
575
576/*
577 * Invalidate a buffer that is being used within a transaction.
578 *
579 * Typically this is because the blocks in the buffer are being freed, so we
580 * need to prevent it from being written out when we're done. Allowing it
581 * to be written again might overwrite data in the free blocks if they are
582 * reallocated to a file.
583 *
584 * We prevent the buffer from being written out by marking it stale. We can't
585 * get rid of the buf log item at this point because the buffer may still be
586 * pinned by another transaction. If that is the case, then we'll wait until
587 * the buffer is committed to disk for the last time (we can tell by the ref
588 * count) and free it in xfs_buf_item_unpin(). Until that happens we will
589 * keep the buffer locked so that the buffer and buf log item are not reused.
590 *
591 * We also set the XFS_BLF_CANCEL flag in the buf log format structure and log
592 * the buf item. This will be used at recovery time to determine that copies
593 * of the buffer in the log before this should not be replayed.
594 *
595 * We mark the item descriptor and the transaction dirty so that we'll hold
596 * the buffer until after the commit.
597 *
598 * Since we're invalidating the buffer, we also clear the state about which
599 * parts of the buffer have been logged. We also clear the flag indicating
600 * that this is an inode buffer since the data in the buffer will no longer
601 * be valid.
602 *
603 * We set the stale bit in the buffer as well since we're getting rid of it.
604 */
605void
606xfs_trans_binval(
607 xfs_trans_t *tp,
608 xfs_buf_t *bp)
609{
610 struct xfs_buf_log_item *bip = bp->b_log_item;
611 int i;
612
613 ASSERT(bp->b_transp == tp);
614 ASSERT(bip != NULL);
615 ASSERT(atomic_read(&bip->bli_refcount) > 0);
616
617 trace_xfs_trans_binval(bip);
618
619 if (bip->bli_flags & XFS_BLI_STALE) {
620 /*
621 * If the buffer is already invalidated, then
622 * just return.
623 */
624 ASSERT(bp->b_flags & XBF_STALE);
625 ASSERT(!(bip->bli_flags & (XFS_BLI_LOGGED | XFS_BLI_DIRTY)));
626 ASSERT(!(bip->__bli_format.blf_flags & XFS_BLF_INODE_BUF));
627 ASSERT(!(bip->__bli_format.blf_flags & XFS_BLFT_MASK));
628 ASSERT(bip->__bli_format.blf_flags & XFS_BLF_CANCEL);
629 ASSERT(bip->bli_item.li_desc->lid_flags & XFS_LID_DIRTY);
630 ASSERT(tp->t_flags & XFS_TRANS_DIRTY);
631 return;
632 }
633
634 xfs_buf_stale(bp);
635
636 bip->bli_flags |= XFS_BLI_STALE;
637 bip->bli_flags &= ~(XFS_BLI_INODE_BUF | XFS_BLI_LOGGED | XFS_BLI_DIRTY);
638 bip->__bli_format.blf_flags &= ~XFS_BLF_INODE_BUF;
639 bip->__bli_format.blf_flags |= XFS_BLF_CANCEL;
640 bip->__bli_format.blf_flags &= ~XFS_BLFT_MASK;
641 for (i = 0; i < bip->bli_format_count; i++) {
642 memset(bip->bli_formats[i].blf_data_map, 0,
643 (bip->bli_formats[i].blf_map_size * sizeof(uint)));
644 }
645 bip->bli_item.li_desc->lid_flags |= XFS_LID_DIRTY;
646 tp->t_flags |= XFS_TRANS_DIRTY;
647}
648
649/*
650 * This call is used to indicate that the buffer contains on-disk inodes which
651 * must be handled specially during recovery. They require special handling
652 * because only the di_next_unlinked from the inodes in the buffer should be
653 * recovered. The rest of the data in the buffer is logged via the inodes
654 * themselves.
655 *
656 * All we do is set the XFS_BLI_INODE_BUF flag in the items flags so it can be
657 * transferred to the buffer's log format structure so that we'll know what to
658 * do at recovery time.
659 */
660void
661xfs_trans_inode_buf(
662 xfs_trans_t *tp,
663 xfs_buf_t *bp)
664{
665 struct xfs_buf_log_item *bip = bp->b_log_item;
666
667 ASSERT(bp->b_transp == tp);
668 ASSERT(bip != NULL);
669 ASSERT(atomic_read(&bip->bli_refcount) > 0);
670
671 bip->bli_flags |= XFS_BLI_INODE_BUF;
672 xfs_trans_buf_set_type(tp, bp, XFS_BLFT_DINO_BUF);
673}
674
675/*
676 * This call is used to indicate that the buffer is going to
677 * be staled and was an inode buffer. This means it gets
678 * special processing during unpin - where any inodes
679 * associated with the buffer should be removed from ail.
680 * There is also special processing during recovery,
681 * any replay of the inodes in the buffer needs to be
682 * prevented as the buffer may have been reused.
683 */
684void
685xfs_trans_stale_inode_buf(
686 xfs_trans_t *tp,
687 xfs_buf_t *bp)
688{
689 struct xfs_buf_log_item *bip = bp->b_log_item;
690
691 ASSERT(bp->b_transp == tp);
692 ASSERT(bip != NULL);
693 ASSERT(atomic_read(&bip->bli_refcount) > 0);
694
695 bip->bli_flags |= XFS_BLI_STALE_INODE;
696 bip->bli_item.li_cb = xfs_buf_iodone;
697 xfs_trans_buf_set_type(tp, bp, XFS_BLFT_DINO_BUF);
698}
699
700/*
701 * Mark the buffer as being one which contains newly allocated
702 * inodes. We need to make sure that even if this buffer is
703 * relogged as an 'inode buf' we still recover all of the inode
704 * images in the face of a crash. This works in coordination with
705 * xfs_buf_item_committed() to ensure that the buffer remains in the
706 * AIL at its original location even after it has been relogged.
707 */
708/* ARGSUSED */
709void
710xfs_trans_inode_alloc_buf(
711 xfs_trans_t *tp,
712 xfs_buf_t *bp)
713{
714 struct xfs_buf_log_item *bip = bp->b_log_item;
715
716 ASSERT(bp->b_transp == tp);
717 ASSERT(bip != NULL);
718 ASSERT(atomic_read(&bip->bli_refcount) > 0);
719
720 bip->bli_flags |= XFS_BLI_INODE_ALLOC_BUF;
721 xfs_trans_buf_set_type(tp, bp, XFS_BLFT_DINO_BUF);
722}
723
724/*
725 * Mark the buffer as ordered for this transaction. This means that the contents
726 * of the buffer are not recorded in the transaction but it is tracked in the
727 * AIL as though it was. This allows us to record logical changes in
728 * transactions rather than the physical changes we make to the buffer without
729 * changing writeback ordering constraints of metadata buffers.
730 */
731bool
732xfs_trans_ordered_buf(
733 struct xfs_trans *tp,
734 struct xfs_buf *bp)
735{
736 struct xfs_buf_log_item *bip = bp->b_log_item;
737
738 ASSERT(bp->b_transp == tp);
739 ASSERT(bip != NULL);
740 ASSERT(atomic_read(&bip->bli_refcount) > 0);
741
742 if (xfs_buf_item_dirty_format(bip))
743 return false;
744
745 bip->bli_flags |= XFS_BLI_ORDERED;
746 trace_xfs_buf_item_ordered(bip);
747
748 /*
749 * We don't log a dirty range of an ordered buffer but it still needs
750 * to be marked dirty and that it has been logged.
751 */
752 xfs_trans_dirty_buf(tp, bp);
753 return true;
754}
755
756/*
757 * Set the type of the buffer for log recovery so that it can correctly identify
758 * and hence attach the correct buffer ops to the buffer after replay.
759 */
760void
761xfs_trans_buf_set_type(
762 struct xfs_trans *tp,
763 struct xfs_buf *bp,
764 enum xfs_blft type)
765{
766 struct xfs_buf_log_item *bip = bp->b_log_item;
767
768 if (!tp)
769 return;
770
771 ASSERT(bp->b_transp == tp);
772 ASSERT(bip != NULL);
773 ASSERT(atomic_read(&bip->bli_refcount) > 0);
774
775 xfs_blft_to_flags(&bip->__bli_format, type);
776}
777
778void
779xfs_trans_buf_copy_type(
780 struct xfs_buf *dst_bp,
781 struct xfs_buf *src_bp)
782{
783 struct xfs_buf_log_item *sbip = src_bp->b_log_item;
784 struct xfs_buf_log_item *dbip = dst_bp->b_log_item;
785 enum xfs_blft type;
786
787 type = xfs_blft_from_flags(&sbip->__bli_format);
788 xfs_blft_to_flags(&dbip->__bli_format, type);
789}
790
791/*
792 * Similar to xfs_trans_inode_buf(), this marks the buffer as a cluster of
793 * dquots. However, unlike in inode buffer recovery, dquot buffers get
794 * recovered in their entirety. (Hence, no XFS_BLI_DQUOT_ALLOC_BUF flag).
795 * The only thing that makes dquot buffers different from regular
796 * buffers is that we must not replay dquot bufs when recovering
797 * if a _corresponding_ quotaoff has happened. We also have to distinguish
798 * between usr dquot bufs and grp dquot bufs, because usr and grp quotas
799 * can be turned off independently.
800 */
801/* ARGSUSED */
802void
803xfs_trans_dquot_buf(
804 xfs_trans_t *tp,
805 xfs_buf_t *bp,
806 uint type)
807{
808 struct xfs_buf_log_item *bip = bp->b_log_item;
809
810 ASSERT(type == XFS_BLF_UDQUOT_BUF ||
811 type == XFS_BLF_PDQUOT_BUF ||
812 type == XFS_BLF_GDQUOT_BUF);
813
814 bip->__bli_format.blf_flags |= type;
815
816 switch (type) {
817 case XFS_BLF_UDQUOT_BUF:
818 type = XFS_BLFT_UDQUOT_BUF;
819 break;
820 case XFS_BLF_PDQUOT_BUF:
821 type = XFS_BLFT_PDQUOT_BUF;
822 break;
823 case XFS_BLF_GDQUOT_BUF:
824 type = XFS_BLFT_GDQUOT_BUF;
825 break;
826 default:
827 type = XFS_BLFT_UNKNOWN_BUF;
828 break;
829 }
830
831 xfs_trans_buf_set_type(tp, bp, type);
832}
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}