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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_types.h"
21#include "xfs_log.h"
22#include "xfs_trans.h"
23#include "xfs_sb.h"
24#include "xfs_ag.h"
25#include "xfs_mount.h"
26#include "xfs_bmap_btree.h"
27#include "xfs_alloc_btree.h"
28#include "xfs_ialloc_btree.h"
29#include "xfs_dinode.h"
30#include "xfs_inode.h"
31#include "xfs_buf_item.h"
32#include "xfs_trans_priv.h"
33#include "xfs_error.h"
34#include "xfs_trace.h"
35
36/*
37 * Check to see if a buffer matching the given parameters is already
38 * a part of the given transaction.
39 */
40STATIC struct xfs_buf *
41xfs_trans_buf_item_match(
42 struct xfs_trans *tp,
43 struct xfs_buftarg *target,
44 xfs_daddr_t blkno,
45 int len)
46{
47 struct xfs_log_item_desc *lidp;
48 struct xfs_buf_log_item *blip;
49
50 len = BBTOB(len);
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) == blkno &&
56 BBTOB(blip->bli_buf->b_length) == len)
57 return blip->bli_buf;
58 }
59
60 return NULL;
61}
62
63/*
64 * Add the locked buffer to the transaction.
65 *
66 * The buffer must be locked, and it cannot be associated with any
67 * transaction.
68 *
69 * If the buffer does not yet have a buf log item associated with it,
70 * then allocate one for it. Then add the buf item to the transaction.
71 */
72STATIC void
73_xfs_trans_bjoin(
74 struct xfs_trans *tp,
75 struct xfs_buf *bp,
76 int reset_recur)
77{
78 struct xfs_buf_log_item *bip;
79
80 ASSERT(bp->b_transp == NULL);
81
82 /*
83 * The xfs_buf_log_item pointer is stored in b_fsprivate. If
84 * it doesn't have one yet, then allocate one and initialize it.
85 * The checks to see if one is there are in xfs_buf_item_init().
86 */
87 xfs_buf_item_init(bp, tp->t_mountp);
88 bip = bp->b_fspriv;
89 ASSERT(!(bip->bli_flags & XFS_BLI_STALE));
90 ASSERT(!(bip->bli_format.blf_flags & XFS_BLF_CANCEL));
91 ASSERT(!(bip->bli_flags & XFS_BLI_LOGGED));
92 if (reset_recur)
93 bip->bli_recur = 0;
94
95 /*
96 * Take a reference for this transaction on the buf item.
97 */
98 atomic_inc(&bip->bli_refcount);
99
100 /*
101 * Get a log_item_desc to point at the new item.
102 */
103 xfs_trans_add_item(tp, &bip->bli_item);
104
105 /*
106 * Initialize b_fsprivate2 so we can find it with incore_match()
107 * in xfs_trans_get_buf() and friends above.
108 */
109 bp->b_transp = tp;
110
111}
112
113void
114xfs_trans_bjoin(
115 struct xfs_trans *tp,
116 struct xfs_buf *bp)
117{
118 _xfs_trans_bjoin(tp, bp, 0);
119 trace_xfs_trans_bjoin(bp->b_fspriv);
120}
121
122/*
123 * Get and lock the buffer for the caller if it is not already
124 * locked within the given transaction. If it is already locked
125 * within the transaction, just increment its lock recursion count
126 * and return a pointer to it.
127 *
128 * If the transaction pointer is NULL, make this just a normal
129 * get_buf() call.
130 */
131xfs_buf_t *
132xfs_trans_get_buf(xfs_trans_t *tp,
133 xfs_buftarg_t *target_dev,
134 xfs_daddr_t blkno,
135 int len,
136 uint flags)
137{
138 xfs_buf_t *bp;
139 xfs_buf_log_item_t *bip;
140
141 /*
142 * Default to a normal get_buf() call if the tp is NULL.
143 */
144 if (tp == NULL)
145 return xfs_buf_get(target_dev, blkno, len, 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_dev, blkno, len);
154 if (bp != NULL) {
155 ASSERT(xfs_buf_islocked(bp));
156 if (XFS_FORCED_SHUTDOWN(tp->t_mountp)) {
157 xfs_buf_stale(bp);
158 XFS_BUF_DONE(bp);
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(target_dev, blkno, len, 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 /*
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_fspriv;
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_fspriv);
228 return (bp);
229}
230
231#ifdef DEBUG
232xfs_buftarg_t *xfs_error_target;
233int xfs_do_error;
234int xfs_req_num;
235int xfs_error_mod = 33;
236#endif
237
238/*
239 * Get and lock the buffer for the caller if it is not already
240 * locked within the given transaction. If it has not yet been
241 * read in, read it from disk. If it is already locked
242 * within the transaction and already read in, just increment its
243 * lock recursion count and return a pointer to it.
244 *
245 * If the transaction pointer is NULL, make this just a normal
246 * read_buf() call.
247 */
248int
249xfs_trans_read_buf(
250 xfs_mount_t *mp,
251 xfs_trans_t *tp,
252 xfs_buftarg_t *target,
253 xfs_daddr_t blkno,
254 int len,
255 uint flags,
256 xfs_buf_t **bpp)
257{
258 xfs_buf_t *bp;
259 xfs_buf_log_item_t *bip;
260 int error;
261
262 *bpp = NULL;
263
264 /*
265 * Default to a normal get_buf() call if the tp is NULL.
266 */
267 if (tp == NULL) {
268 bp = xfs_buf_read(target, blkno, len, flags);
269 if (!bp)
270 return (flags & XBF_TRYLOCK) ?
271 EAGAIN : XFS_ERROR(ENOMEM);
272
273 if (bp->b_error) {
274 error = bp->b_error;
275 xfs_buf_ioerror_alert(bp, __func__);
276 XFS_BUF_UNDONE(bp);
277 xfs_buf_stale(bp);
278 xfs_buf_relse(bp);
279 return error;
280 }
281#ifdef DEBUG
282 if (xfs_do_error) {
283 if (xfs_error_target == target) {
284 if (((xfs_req_num++) % xfs_error_mod) == 0) {
285 xfs_buf_relse(bp);
286 xfs_debug(mp, "Returning error!");
287 return XFS_ERROR(EIO);
288 }
289 }
290 }
291#endif
292 if (XFS_FORCED_SHUTDOWN(mp))
293 goto shutdown_abort;
294 *bpp = bp;
295 return 0;
296 }
297
298 /*
299 * If we find the buffer in the cache with this transaction
300 * pointer in its b_fsprivate2 field, then we know we already
301 * have it locked. If it is already read in we just increment
302 * the lock recursion count and return the buffer to the caller.
303 * If the buffer is not yet read in, then we read it in, increment
304 * the lock recursion count, and return it to the caller.
305 */
306 bp = xfs_trans_buf_item_match(tp, target, blkno, len);
307 if (bp != NULL) {
308 ASSERT(xfs_buf_islocked(bp));
309 ASSERT(bp->b_transp == tp);
310 ASSERT(bp->b_fspriv != NULL);
311 ASSERT(!bp->b_error);
312 if (!(XFS_BUF_ISDONE(bp))) {
313 trace_xfs_trans_read_buf_io(bp, _RET_IP_);
314 ASSERT(!XFS_BUF_ISASYNC(bp));
315 XFS_BUF_READ(bp);
316 xfsbdstrat(tp->t_mountp, bp);
317 error = xfs_buf_iowait(bp);
318 if (error) {
319 xfs_buf_ioerror_alert(bp, __func__);
320 xfs_buf_relse(bp);
321 /*
322 * We can gracefully recover from most read
323 * errors. Ones we can't are those that happen
324 * after the transaction's already dirty.
325 */
326 if (tp->t_flags & XFS_TRANS_DIRTY)
327 xfs_force_shutdown(tp->t_mountp,
328 SHUTDOWN_META_IO_ERROR);
329 return error;
330 }
331 }
332 /*
333 * We never locked this buf ourselves, so we shouldn't
334 * brelse it either. Just get out.
335 */
336 if (XFS_FORCED_SHUTDOWN(mp)) {
337 trace_xfs_trans_read_buf_shut(bp, _RET_IP_);
338 *bpp = NULL;
339 return XFS_ERROR(EIO);
340 }
341
342
343 bip = bp->b_fspriv;
344 bip->bli_recur++;
345
346 ASSERT(atomic_read(&bip->bli_refcount) > 0);
347 trace_xfs_trans_read_buf_recur(bip);
348 *bpp = bp;
349 return 0;
350 }
351
352 bp = xfs_buf_read(target, blkno, len, flags);
353 if (bp == NULL) {
354 *bpp = NULL;
355 return (flags & XBF_TRYLOCK) ?
356 0 : XFS_ERROR(ENOMEM);
357 }
358 if (bp->b_error) {
359 error = bp->b_error;
360 xfs_buf_stale(bp);
361 XFS_BUF_DONE(bp);
362 xfs_buf_ioerror_alert(bp, __func__);
363 if (tp->t_flags & XFS_TRANS_DIRTY)
364 xfs_force_shutdown(tp->t_mountp, SHUTDOWN_META_IO_ERROR);
365 xfs_buf_relse(bp);
366 return error;
367 }
368#ifdef DEBUG
369 if (xfs_do_error && !(tp->t_flags & XFS_TRANS_DIRTY)) {
370 if (xfs_error_target == target) {
371 if (((xfs_req_num++) % xfs_error_mod) == 0) {
372 xfs_force_shutdown(tp->t_mountp,
373 SHUTDOWN_META_IO_ERROR);
374 xfs_buf_relse(bp);
375 xfs_debug(mp, "Returning trans error!");
376 return XFS_ERROR(EIO);
377 }
378 }
379 }
380#endif
381 if (XFS_FORCED_SHUTDOWN(mp))
382 goto shutdown_abort;
383
384 _xfs_trans_bjoin(tp, bp, 1);
385 trace_xfs_trans_read_buf(bp->b_fspriv);
386
387 *bpp = bp;
388 return 0;
389
390shutdown_abort:
391 trace_xfs_trans_read_buf_shut(bp, _RET_IP_);
392 xfs_buf_relse(bp);
393 *bpp = NULL;
394 return XFS_ERROR(EIO);
395}
396
397
398/*
399 * Release the buffer bp which was previously acquired with one of the
400 * xfs_trans_... buffer allocation routines if the buffer has not
401 * been modified within this transaction. If the buffer is modified
402 * within this transaction, do decrement the recursion count but do
403 * not release the buffer even if the count goes to 0. If the buffer is not
404 * modified within the transaction, decrement the recursion count and
405 * release the buffer if the recursion count goes to 0.
406 *
407 * If the buffer is to be released and it was not modified before
408 * this transaction began, then free the buf_log_item associated with it.
409 *
410 * If the transaction pointer is NULL, make this just a normal
411 * brelse() call.
412 */
413void
414xfs_trans_brelse(xfs_trans_t *tp,
415 xfs_buf_t *bp)
416{
417 xfs_buf_log_item_t *bip;
418
419 /*
420 * Default to a normal brelse() call if the tp is NULL.
421 */
422 if (tp == NULL) {
423 ASSERT(bp->b_transp == NULL);
424 xfs_buf_relse(bp);
425 return;
426 }
427
428 ASSERT(bp->b_transp == tp);
429 bip = bp->b_fspriv;
430 ASSERT(bip->bli_item.li_type == XFS_LI_BUF);
431 ASSERT(!(bip->bli_flags & XFS_BLI_STALE));
432 ASSERT(!(bip->bli_format.blf_flags & XFS_BLF_CANCEL));
433 ASSERT(atomic_read(&bip->bli_refcount) > 0);
434
435 trace_xfs_trans_brelse(bip);
436
437 /*
438 * If the release is just for a recursive lock,
439 * then decrement the count and return.
440 */
441 if (bip->bli_recur > 0) {
442 bip->bli_recur--;
443 return;
444 }
445
446 /*
447 * If the buffer is dirty within this transaction, we can't
448 * release it until we commit.
449 */
450 if (bip->bli_item.li_desc->lid_flags & XFS_LID_DIRTY)
451 return;
452
453 /*
454 * If the buffer has been invalidated, then we can't release
455 * it until the transaction commits to disk unless it is re-dirtied
456 * as part of this transaction. This prevents us from pulling
457 * the item from the AIL before we should.
458 */
459 if (bip->bli_flags & XFS_BLI_STALE)
460 return;
461
462 ASSERT(!(bip->bli_flags & XFS_BLI_LOGGED));
463
464 /*
465 * Free up the log item descriptor tracking the released item.
466 */
467 xfs_trans_del_item(&bip->bli_item);
468
469 /*
470 * Clear the hold flag in the buf log item if it is set.
471 * We wouldn't want the next user of the buffer to
472 * get confused.
473 */
474 if (bip->bli_flags & XFS_BLI_HOLD) {
475 bip->bli_flags &= ~XFS_BLI_HOLD;
476 }
477
478 /*
479 * Drop our reference to the buf log item.
480 */
481 atomic_dec(&bip->bli_refcount);
482
483 /*
484 * If the buf item is not tracking data in the log, then
485 * we must free it before releasing the buffer back to the
486 * free pool. Before releasing the buffer to the free pool,
487 * clear the transaction pointer in b_fsprivate2 to dissolve
488 * its relation to this transaction.
489 */
490 if (!xfs_buf_item_dirty(bip)) {
491/***
492 ASSERT(bp->b_pincount == 0);
493***/
494 ASSERT(atomic_read(&bip->bli_refcount) == 0);
495 ASSERT(!(bip->bli_item.li_flags & XFS_LI_IN_AIL));
496 ASSERT(!(bip->bli_flags & XFS_BLI_INODE_ALLOC_BUF));
497 xfs_buf_item_relse(bp);
498 }
499
500 bp->b_transp = NULL;
501 xfs_buf_relse(bp);
502}
503
504/*
505 * Mark the buffer as not needing to be unlocked when the buf item's
506 * IOP_UNLOCK() routine is called. The buffer must already be locked
507 * and associated with the given transaction.
508 */
509/* ARGSUSED */
510void
511xfs_trans_bhold(xfs_trans_t *tp,
512 xfs_buf_t *bp)
513{
514 xfs_buf_log_item_t *bip = bp->b_fspriv;
515
516 ASSERT(bp->b_transp == tp);
517 ASSERT(bip != NULL);
518 ASSERT(!(bip->bli_flags & XFS_BLI_STALE));
519 ASSERT(!(bip->bli_format.blf_flags & XFS_BLF_CANCEL));
520 ASSERT(atomic_read(&bip->bli_refcount) > 0);
521
522 bip->bli_flags |= XFS_BLI_HOLD;
523 trace_xfs_trans_bhold(bip);
524}
525
526/*
527 * Cancel the previous buffer hold request made on this buffer
528 * for this transaction.
529 */
530void
531xfs_trans_bhold_release(xfs_trans_t *tp,
532 xfs_buf_t *bp)
533{
534 xfs_buf_log_item_t *bip = bp->b_fspriv;
535
536 ASSERT(bp->b_transp == tp);
537 ASSERT(bip != NULL);
538 ASSERT(!(bip->bli_flags & XFS_BLI_STALE));
539 ASSERT(!(bip->bli_format.blf_flags & XFS_BLF_CANCEL));
540 ASSERT(atomic_read(&bip->bli_refcount) > 0);
541 ASSERT(bip->bli_flags & XFS_BLI_HOLD);
542
543 bip->bli_flags &= ~XFS_BLI_HOLD;
544 trace_xfs_trans_bhold_release(bip);
545}
546
547/*
548 * This is called to mark bytes first through last inclusive of the given
549 * buffer as needing to be logged when the transaction is committed.
550 * The buffer must already be associated with the given transaction.
551 *
552 * First and last are numbers relative to the beginning of this buffer,
553 * so the first byte in the buffer is numbered 0 regardless of the
554 * value of b_blkno.
555 */
556void
557xfs_trans_log_buf(xfs_trans_t *tp,
558 xfs_buf_t *bp,
559 uint first,
560 uint last)
561{
562 xfs_buf_log_item_t *bip = bp->b_fspriv;
563
564 ASSERT(bp->b_transp == tp);
565 ASSERT(bip != NULL);
566 ASSERT(first <= last && last < BBTOB(bp->b_length));
567 ASSERT(bp->b_iodone == NULL ||
568 bp->b_iodone == xfs_buf_iodone_callbacks);
569
570 /*
571 * Mark the buffer as needing to be written out eventually,
572 * and set its iodone function to remove the buffer's buf log
573 * item from the AIL and free it when the buffer is flushed
574 * to disk. See xfs_buf_attach_iodone() for more details
575 * on li_cb and xfs_buf_iodone_callbacks().
576 * If we end up aborting this transaction, we trap this buffer
577 * inside the b_bdstrat callback so that this won't get written to
578 * disk.
579 */
580 XFS_BUF_DONE(bp);
581
582 ASSERT(atomic_read(&bip->bli_refcount) > 0);
583 bp->b_iodone = xfs_buf_iodone_callbacks;
584 bip->bli_item.li_cb = xfs_buf_iodone;
585
586 trace_xfs_trans_log_buf(bip);
587
588 /*
589 * If we invalidated the buffer within this transaction, then
590 * cancel the invalidation now that we're dirtying the buffer
591 * again. There are no races with the code in xfs_buf_item_unpin(),
592 * because we have a reference to the buffer this entire time.
593 */
594 if (bip->bli_flags & XFS_BLI_STALE) {
595 bip->bli_flags &= ~XFS_BLI_STALE;
596 ASSERT(XFS_BUF_ISSTALE(bp));
597 XFS_BUF_UNSTALE(bp);
598 bip->bli_format.blf_flags &= ~XFS_BLF_CANCEL;
599 }
600
601 tp->t_flags |= XFS_TRANS_DIRTY;
602 bip->bli_item.li_desc->lid_flags |= XFS_LID_DIRTY;
603 bip->bli_flags |= XFS_BLI_LOGGED;
604 xfs_buf_item_log(bip, first, last);
605}
606
607
608/*
609 * Invalidate a buffer that is being used within a transaction.
610 *
611 * Typically this is because the blocks in the buffer are being freed, so we
612 * need to prevent it from being written out when we're done. Allowing it
613 * to be written again might overwrite data in the free blocks if they are
614 * reallocated to a file.
615 *
616 * We prevent the buffer from being written out by marking it stale. We can't
617 * get rid of the buf log item at this point because the buffer may still be
618 * pinned by another transaction. If that is the case, then we'll wait until
619 * the buffer is committed to disk for the last time (we can tell by the ref
620 * count) and free it in xfs_buf_item_unpin(). Until that happens we will
621 * keep the buffer locked so that the buffer and buf log item are not reused.
622 *
623 * We also set the XFS_BLF_CANCEL flag in the buf log format structure and log
624 * the buf item. This will be used at recovery time to determine that copies
625 * of the buffer in the log before this should not be replayed.
626 *
627 * We mark the item descriptor and the transaction dirty so that we'll hold
628 * the buffer until after the commit.
629 *
630 * Since we're invalidating the buffer, we also clear the state about which
631 * parts of the buffer have been logged. We also clear the flag indicating
632 * that this is an inode buffer since the data in the buffer will no longer
633 * be valid.
634 *
635 * We set the stale bit in the buffer as well since we're getting rid of it.
636 */
637void
638xfs_trans_binval(
639 xfs_trans_t *tp,
640 xfs_buf_t *bp)
641{
642 xfs_buf_log_item_t *bip = bp->b_fspriv;
643
644 ASSERT(bp->b_transp == tp);
645 ASSERT(bip != NULL);
646 ASSERT(atomic_read(&bip->bli_refcount) > 0);
647
648 trace_xfs_trans_binval(bip);
649
650 if (bip->bli_flags & XFS_BLI_STALE) {
651 /*
652 * If the buffer is already invalidated, then
653 * just return.
654 */
655 ASSERT(XFS_BUF_ISSTALE(bp));
656 ASSERT(!(bip->bli_flags & (XFS_BLI_LOGGED | XFS_BLI_DIRTY)));
657 ASSERT(!(bip->bli_format.blf_flags & XFS_BLF_INODE_BUF));
658 ASSERT(bip->bli_format.blf_flags & XFS_BLF_CANCEL);
659 ASSERT(bip->bli_item.li_desc->lid_flags & XFS_LID_DIRTY);
660 ASSERT(tp->t_flags & XFS_TRANS_DIRTY);
661 return;
662 }
663
664 xfs_buf_stale(bp);
665
666 bip->bli_flags |= XFS_BLI_STALE;
667 bip->bli_flags &= ~(XFS_BLI_INODE_BUF | XFS_BLI_LOGGED | XFS_BLI_DIRTY);
668 bip->bli_format.blf_flags &= ~XFS_BLF_INODE_BUF;
669 bip->bli_format.blf_flags |= XFS_BLF_CANCEL;
670 memset((char *)(bip->bli_format.blf_data_map), 0,
671 (bip->bli_format.blf_map_size * sizeof(uint)));
672 bip->bli_item.li_desc->lid_flags |= XFS_LID_DIRTY;
673 tp->t_flags |= XFS_TRANS_DIRTY;
674}
675
676/*
677 * This call is used to indicate that the buffer contains on-disk inodes which
678 * must be handled specially during recovery. They require special handling
679 * because only the di_next_unlinked from the inodes in the buffer should be
680 * recovered. The rest of the data in the buffer is logged via the inodes
681 * themselves.
682 *
683 * All we do is set the XFS_BLI_INODE_BUF flag in the items flags so it can be
684 * transferred to the buffer's log format structure so that we'll know what to
685 * do at recovery time.
686 */
687void
688xfs_trans_inode_buf(
689 xfs_trans_t *tp,
690 xfs_buf_t *bp)
691{
692 xfs_buf_log_item_t *bip = bp->b_fspriv;
693
694 ASSERT(bp->b_transp == tp);
695 ASSERT(bip != NULL);
696 ASSERT(atomic_read(&bip->bli_refcount) > 0);
697
698 bip->bli_flags |= XFS_BLI_INODE_BUF;
699}
700
701/*
702 * This call is used to indicate that the buffer is going to
703 * be staled and was an inode buffer. This means it gets
704 * special processing during unpin - where any inodes
705 * associated with the buffer should be removed from ail.
706 * There is also special processing during recovery,
707 * any replay of the inodes in the buffer needs to be
708 * prevented as the buffer may have been reused.
709 */
710void
711xfs_trans_stale_inode_buf(
712 xfs_trans_t *tp,
713 xfs_buf_t *bp)
714{
715 xfs_buf_log_item_t *bip = bp->b_fspriv;
716
717 ASSERT(bp->b_transp == tp);
718 ASSERT(bip != NULL);
719 ASSERT(atomic_read(&bip->bli_refcount) > 0);
720
721 bip->bli_flags |= XFS_BLI_STALE_INODE;
722 bip->bli_item.li_cb = xfs_buf_iodone;
723}
724
725/*
726 * Mark the buffer as being one which contains newly allocated
727 * inodes. We need to make sure that even if this buffer is
728 * relogged as an 'inode buf' we still recover all of the inode
729 * images in the face of a crash. This works in coordination with
730 * xfs_buf_item_committed() to ensure that the buffer remains in the
731 * AIL at its original location even after it has been relogged.
732 */
733/* ARGSUSED */
734void
735xfs_trans_inode_alloc_buf(
736 xfs_trans_t *tp,
737 xfs_buf_t *bp)
738{
739 xfs_buf_log_item_t *bip = bp->b_fspriv;
740
741 ASSERT(bp->b_transp == tp);
742 ASSERT(bip != NULL);
743 ASSERT(atomic_read(&bip->bli_refcount) > 0);
744
745 bip->bli_flags |= XFS_BLI_INODE_ALLOC_BUF;
746}
747
748
749/*
750 * Similar to xfs_trans_inode_buf(), this marks the buffer as a cluster of
751 * dquots. However, unlike in inode buffer recovery, dquot buffers get
752 * recovered in their entirety. (Hence, no XFS_BLI_DQUOT_ALLOC_BUF flag).
753 * The only thing that makes dquot buffers different from regular
754 * buffers is that we must not replay dquot bufs when recovering
755 * if a _corresponding_ quotaoff has happened. We also have to distinguish
756 * between usr dquot bufs and grp dquot bufs, because usr and grp quotas
757 * can be turned off independently.
758 */
759/* ARGSUSED */
760void
761xfs_trans_dquot_buf(
762 xfs_trans_t *tp,
763 xfs_buf_t *bp,
764 uint type)
765{
766 xfs_buf_log_item_t *bip = bp->b_fspriv;
767
768 ASSERT(bp->b_transp == tp);
769 ASSERT(bip != NULL);
770 ASSERT(type == XFS_BLF_UDQUOT_BUF ||
771 type == XFS_BLF_PDQUOT_BUF ||
772 type == XFS_BLF_GDQUOT_BUF);
773 ASSERT(atomic_read(&bip->bli_refcount) > 0);
774
775 bip->bli_format.blf_flags |= type;
776}
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}