2 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
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.
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.
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
20 #include "xfs_types.h"
24 #include "xfs_trans.h"
27 #include "xfs_mount.h"
28 #include "xfs_buf_item.h"
29 #include "xfs_trans_priv.h"
30 #include "xfs_error.h"
31 #include "xfs_trace.h"
34 kmem_zone_t
*xfs_buf_item_zone
;
36 #ifdef XFS_TRANS_DEBUG
38 * This function uses an alternate strategy for tracking the bytes
39 * that the user requests to be logged. This can then be used
40 * in conjunction with the bli_orig array in the buf log item to
41 * catch bugs in our callers' code.
43 * We also double check the bits set in xfs_buf_item_log using a
44 * simple algorithm to check that every byte is accounted for.
47 xfs_buf_item_log_debug(
48 xfs_buf_log_item_t
*bip
,
61 ASSERT(bip
->bli_logged
!= NULL
);
63 nbytes
= last
- first
+ 1;
64 bfset(bip
->bli_logged
, first
, nbytes
);
65 for (x
= 0; x
< nbytes
; x
++) {
66 chunk_num
= byte
>> XFS_BLF_SHIFT
;
67 word_num
= chunk_num
>> BIT_TO_WORD_SHIFT
;
68 bit_num
= chunk_num
& (NBWORD
- 1);
69 wordp
= &(bip
->bli_format
.blf_data_map
[word_num
]);
70 bit_set
= *wordp
& (1 << bit_num
);
77 * This function is called when we flush something into a buffer without
78 * logging it. This happens for things like inodes which are logged
79 * separately from the buffer.
82 xfs_buf_item_flush_log_debug(
87 xfs_buf_log_item_t
*bip
;
90 bip
= XFS_BUF_FSPRIVATE(bp
, xfs_buf_log_item_t
*);
91 if ((bip
== NULL
) || (bip
->bli_item
.li_type
!= XFS_LI_BUF
)) {
95 ASSERT(bip
->bli_logged
!= NULL
);
96 nbytes
= last
- first
+ 1;
97 bfset(bip
->bli_logged
, first
, nbytes
);
101 * This function is called to verify that our callers have logged
102 * all the bytes that they changed.
104 * It does this by comparing the original copy of the buffer stored in
105 * the buf log item's bli_orig array to the current copy of the buffer
106 * and ensuring that all bytes which mismatch are set in the bli_logged
107 * array of the buf log item.
110 xfs_buf_item_log_check(
111 xfs_buf_log_item_t
*bip
)
118 ASSERT(bip
->bli_orig
!= NULL
);
119 ASSERT(bip
->bli_logged
!= NULL
);
122 ASSERT(XFS_BUF_COUNT(bp
) > 0);
123 ASSERT(XFS_BUF_PTR(bp
) != NULL
);
124 orig
= bip
->bli_orig
;
125 buffer
= XFS_BUF_PTR(bp
);
126 for (x
= 0; x
< XFS_BUF_COUNT(bp
); x
++) {
127 if (orig
[x
] != buffer
[x
] && !btst(bip
->bli_logged
, x
))
129 "xfs_buf_item_log_check bip %x buffer %x orig %x index %d",
134 #define xfs_buf_item_log_debug(x,y,z)
135 #define xfs_buf_item_log_check(x)
138 STATIC
void xfs_buf_error_relse(xfs_buf_t
*bp
);
139 STATIC
void xfs_buf_do_callbacks(xfs_buf_t
*bp
, xfs_log_item_t
*lip
);
142 * This returns the number of log iovecs needed to log the
143 * given buf log item.
145 * It calculates this as 1 iovec for the buf log format structure
146 * and 1 for each stretch of non-contiguous chunks to be logged.
147 * Contiguous chunks are logged in a single iovec.
149 * If the XFS_BLI_STALE flag has been set, then log nothing.
153 xfs_buf_log_item_t
*bip
)
160 ASSERT(atomic_read(&bip
->bli_refcount
) > 0);
161 if (bip
->bli_flags
& XFS_BLI_STALE
) {
163 * The buffer is stale, so all we need to log
164 * is the buf log format structure with the
167 trace_xfs_buf_item_size_stale(bip
);
168 ASSERT(bip
->bli_format
.blf_flags
& XFS_BLF_CANCEL
);
173 ASSERT(bip
->bli_flags
& XFS_BLI_LOGGED
);
175 last_bit
= xfs_next_bit(bip
->bli_format
.blf_data_map
,
176 bip
->bli_format
.blf_map_size
, 0);
177 ASSERT(last_bit
!= -1);
179 while (last_bit
!= -1) {
181 * This takes the bit number to start looking from and
182 * returns the next set bit from there. It returns -1
183 * if there are no more bits set or the start bit is
184 * beyond the end of the bitmap.
186 next_bit
= xfs_next_bit(bip
->bli_format
.blf_data_map
,
187 bip
->bli_format
.blf_map_size
,
190 * If we run out of bits, leave the loop,
191 * else if we find a new set of bits bump the number of vecs,
192 * else keep scanning the current set of bits.
194 if (next_bit
== -1) {
196 } else if (next_bit
!= last_bit
+ 1) {
199 } else if (xfs_buf_offset(bp
, next_bit
* XFS_BLF_CHUNK
) !=
200 (xfs_buf_offset(bp
, last_bit
* XFS_BLF_CHUNK
) +
209 trace_xfs_buf_item_size(bip
);
214 * This is called to fill in the vector of log iovecs for the
215 * given log buf item. It fills the first entry with a buf log
216 * format structure, and the rest point to contiguous chunks
221 xfs_buf_log_item_t
*bip
,
222 xfs_log_iovec_t
*log_vector
)
226 xfs_log_iovec_t
*vecp
;
234 ASSERT(atomic_read(&bip
->bli_refcount
) > 0);
235 ASSERT((bip
->bli_flags
& XFS_BLI_LOGGED
) ||
236 (bip
->bli_flags
& XFS_BLI_STALE
));
241 * The size of the base structure is the size of the
242 * declared structure plus the space for the extra words
243 * of the bitmap. We subtract one from the map size, because
244 * the first element of the bitmap is accounted for in the
245 * size of the base structure.
248 (uint
)(sizeof(xfs_buf_log_format_t
) +
249 ((bip
->bli_format
.blf_map_size
- 1) * sizeof(uint
)));
250 vecp
->i_addr
= (xfs_caddr_t
)&bip
->bli_format
;
251 vecp
->i_len
= base_size
;
252 vecp
->i_type
= XLOG_REG_TYPE_BFORMAT
;
257 * If it is an inode buffer, transfer the in-memory state to the
258 * format flags and clear the in-memory state. We do not transfer
259 * this state if the inode buffer allocation has not yet been committed
260 * to the log as setting the XFS_BLI_INODE_BUF flag will prevent
261 * correct replay of the inode allocation.
263 if (bip
->bli_flags
& XFS_BLI_INODE_BUF
) {
264 if (!((bip
->bli_flags
& XFS_BLI_INODE_ALLOC_BUF
) &&
265 xfs_log_item_in_current_chkpt(&bip
->bli_item
)))
266 bip
->bli_format
.blf_flags
|= XFS_BLF_INODE_BUF
;
267 bip
->bli_flags
&= ~XFS_BLI_INODE_BUF
;
270 if (bip
->bli_flags
& XFS_BLI_STALE
) {
272 * The buffer is stale, so all we need to log
273 * is the buf log format structure with the
276 trace_xfs_buf_item_format_stale(bip
);
277 ASSERT(bip
->bli_format
.blf_flags
& XFS_BLF_CANCEL
);
278 bip
->bli_format
.blf_size
= nvecs
;
283 * Fill in an iovec for each set of contiguous chunks.
285 first_bit
= xfs_next_bit(bip
->bli_format
.blf_data_map
,
286 bip
->bli_format
.blf_map_size
, 0);
287 ASSERT(first_bit
!= -1);
288 last_bit
= first_bit
;
292 * This takes the bit number to start looking from and
293 * returns the next set bit from there. It returns -1
294 * if there are no more bits set or the start bit is
295 * beyond the end of the bitmap.
297 next_bit
= xfs_next_bit(bip
->bli_format
.blf_data_map
,
298 bip
->bli_format
.blf_map_size
,
301 * If we run out of bits fill in the last iovec and get
303 * Else if we start a new set of bits then fill in the
304 * iovec for the series we were looking at and start
305 * counting the bits in the new one.
306 * Else we're still in the same set of bits so just
307 * keep counting and scanning.
309 if (next_bit
== -1) {
310 buffer_offset
= first_bit
* XFS_BLF_CHUNK
;
311 vecp
->i_addr
= xfs_buf_offset(bp
, buffer_offset
);
312 vecp
->i_len
= nbits
* XFS_BLF_CHUNK
;
313 vecp
->i_type
= XLOG_REG_TYPE_BCHUNK
;
316 } else if (next_bit
!= last_bit
+ 1) {
317 buffer_offset
= first_bit
* XFS_BLF_CHUNK
;
318 vecp
->i_addr
= xfs_buf_offset(bp
, buffer_offset
);
319 vecp
->i_len
= nbits
* XFS_BLF_CHUNK
;
320 vecp
->i_type
= XLOG_REG_TYPE_BCHUNK
;
323 first_bit
= next_bit
;
326 } else if (xfs_buf_offset(bp
, next_bit
<< XFS_BLF_SHIFT
) !=
327 (xfs_buf_offset(bp
, last_bit
<< XFS_BLF_SHIFT
) +
329 buffer_offset
= first_bit
* XFS_BLF_CHUNK
;
330 vecp
->i_addr
= xfs_buf_offset(bp
, buffer_offset
);
331 vecp
->i_len
= nbits
* XFS_BLF_CHUNK
;
332 vecp
->i_type
= XLOG_REG_TYPE_BCHUNK
;
333 /* You would think we need to bump the nvecs here too, but we do not
334 * this number is used by recovery, and it gets confused by the boundary
339 first_bit
= next_bit
;
347 bip
->bli_format
.blf_size
= nvecs
;
350 * Check to make sure everything is consistent.
352 trace_xfs_buf_item_format(bip
);
353 xfs_buf_item_log_check(bip
);
357 * This is called to pin the buffer associated with the buf log item in memory
358 * so it cannot be written out. Simply call bpin() on the buffer to do this.
360 * We also always take a reference to the buffer log item here so that the bli
361 * is held while the item is pinned in memory. This means that we can
362 * unconditionally drop the reference count a transaction holds when the
363 * transaction is completed.
368 xfs_buf_log_item_t
*bip
)
373 ASSERT(XFS_BUF_ISBUSY(bp
));
374 ASSERT(atomic_read(&bip
->bli_refcount
) > 0);
375 ASSERT((bip
->bli_flags
& XFS_BLI_LOGGED
) ||
376 (bip
->bli_flags
& XFS_BLI_STALE
));
377 atomic_inc(&bip
->bli_refcount
);
378 trace_xfs_buf_item_pin(bip
);
384 * This is called to unpin the buffer associated with the buf log
385 * item which was previously pinned with a call to xfs_buf_item_pin().
386 * Just call bunpin() on the buffer to do this.
388 * Also drop the reference to the buf item for the current transaction.
389 * If the XFS_BLI_STALE flag is set and we are the last reference,
390 * then free up the buf log item and unlock the buffer.
392 * If the remove flag is set we are called from uncommit in the
393 * forced-shutdown path. If that is true and the reference count on
394 * the log item is going to drop to zero we need to free the item's
395 * descriptor in the transaction.
399 xfs_buf_log_item_t
*bip
,
402 struct xfs_ail
*ailp
;
403 xfs_buf_t
*bp
= bip
->bli_buf
;
405 int stale
= bip
->bli_flags
& XFS_BLI_STALE
;
407 ASSERT(XFS_BUF_FSPRIVATE(bp
, xfs_buf_log_item_t
*) == bip
);
408 ASSERT(atomic_read(&bip
->bli_refcount
) > 0);
410 trace_xfs_buf_item_unpin(bip
);
412 freed
= atomic_dec_and_test(&bip
->bli_refcount
);
413 ailp
= bip
->bli_item
.li_ailp
;
415 if (freed
&& stale
) {
416 ASSERT(bip
->bli_flags
& XFS_BLI_STALE
);
417 ASSERT(XFS_BUF_VALUSEMA(bp
) <= 0);
418 ASSERT(!(XFS_BUF_ISDELAYWRITE(bp
)));
419 ASSERT(XFS_BUF_ISSTALE(bp
));
420 ASSERT(bip
->bli_format
.blf_flags
& XFS_BLF_CANCEL
);
422 trace_xfs_buf_item_unpin_stale(bip
);
426 * We have to remove the log item from the transaction
427 * as we are about to release our reference to the
428 * buffer. If we don't, the unlock that occurs later
429 * in xfs_trans_uncommit() will ry to reference the
430 * buffer which we no longer have a hold on.
432 xfs_trans_del_item(&bip
->bli_item
);
435 * Since the transaction no longer refers to the buffer,
436 * the buffer should no longer refer to the transaction.
438 XFS_BUF_SET_FSPRIVATE2(bp
, NULL
);
442 * If we get called here because of an IO error, we may
443 * or may not have the item on the AIL. xfs_trans_ail_delete()
444 * will take care of that situation.
445 * xfs_trans_ail_delete() drops the AIL lock.
447 if (bip
->bli_flags
& XFS_BLI_STALE_INODE
) {
448 xfs_buf_do_callbacks(bp
, (xfs_log_item_t
*)bip
);
449 XFS_BUF_SET_FSPRIVATE(bp
, NULL
);
450 XFS_BUF_CLR_IODONE_FUNC(bp
);
452 spin_lock(&ailp
->xa_lock
);
453 xfs_trans_ail_delete(ailp
, (xfs_log_item_t
*)bip
);
454 xfs_buf_item_relse(bp
);
455 ASSERT(XFS_BUF_FSPRIVATE(bp
, void *) == NULL
);
462 * This is called to attempt to lock the buffer associated with this
463 * buf log item. Don't sleep on the buffer lock. If we can't get
464 * the lock right away, return 0. If we can get the lock, take a
465 * reference to the buffer. If this is a delayed write buffer that
466 * needs AIL help to be written back, invoke the pushbuf routine
467 * rather than the normal success path.
470 xfs_buf_item_trylock(
471 xfs_buf_log_item_t
*bip
)
476 if (XFS_BUF_ISPINNED(bp
))
477 return XFS_ITEM_PINNED
;
478 if (!XFS_BUF_CPSEMA(bp
))
479 return XFS_ITEM_LOCKED
;
481 /* take a reference to the buffer. */
484 ASSERT(!(bip
->bli_flags
& XFS_BLI_STALE
));
485 trace_xfs_buf_item_trylock(bip
);
486 if (XFS_BUF_ISDELAYWRITE(bp
))
487 return XFS_ITEM_PUSHBUF
;
488 return XFS_ITEM_SUCCESS
;
492 * Release the buffer associated with the buf log item. If there is no dirty
493 * logged data associated with the buffer recorded in the buf log item, then
494 * free the buf log item and remove the reference to it in the buffer.
496 * This call ignores the recursion count. It is only called when the buffer
497 * should REALLY be unlocked, regardless of the recursion count.
499 * We unconditionally drop the transaction's reference to the log item. If the
500 * item was logged, then another reference was taken when it was pinned, so we
501 * can safely drop the transaction reference now. This also allows us to avoid
502 * potential races with the unpin code freeing the bli by not referencing the
503 * bli after we've dropped the reference count.
505 * If the XFS_BLI_HOLD flag is set in the buf log item, then free the log item
506 * if necessary but do not unlock the buffer. This is for support of
507 * xfs_trans_bhold(). Make sure the XFS_BLI_HOLD field is cleared if we don't
512 xfs_buf_log_item_t
*bip
)
520 /* Clear the buffer's association with this transaction. */
521 XFS_BUF_SET_FSPRIVATE2(bp
, NULL
);
524 * If this is a transaction abort, don't return early. Instead, allow
525 * the brelse to happen. Normally it would be done for stale
526 * (cancelled) buffers at unpin time, but we'll never go through the
527 * pin/unpin cycle if we abort inside commit.
529 aborted
= (bip
->bli_item
.li_flags
& XFS_LI_ABORTED
) != 0;
532 * Before possibly freeing the buf item, determine if we should
533 * release the buffer at the end of this routine.
535 hold
= bip
->bli_flags
& XFS_BLI_HOLD
;
537 /* Clear the per transaction state. */
538 bip
->bli_flags
&= ~(XFS_BLI_LOGGED
| XFS_BLI_HOLD
);
541 * If the buf item is marked stale, then don't do anything. We'll
542 * unlock the buffer and free the buf item when the buffer is unpinned
545 if (bip
->bli_flags
& XFS_BLI_STALE
) {
546 trace_xfs_buf_item_unlock_stale(bip
);
547 ASSERT(bip
->bli_format
.blf_flags
& XFS_BLF_CANCEL
);
549 atomic_dec(&bip
->bli_refcount
);
554 trace_xfs_buf_item_unlock(bip
);
557 * If the buf item isn't tracking any data, free it, otherwise drop the
558 * reference we hold to it.
560 if (xfs_bitmap_empty(bip
->bli_format
.blf_data_map
,
561 bip
->bli_format
.blf_map_size
))
562 xfs_buf_item_relse(bp
);
564 atomic_dec(&bip
->bli_refcount
);
571 * This is called to find out where the oldest active copy of the
572 * buf log item in the on disk log resides now that the last log
573 * write of it completed at the given lsn.
574 * We always re-log all the dirty data in a buffer, so usually the
575 * latest copy in the on disk log is the only one that matters. For
576 * those cases we simply return the given lsn.
578 * The one exception to this is for buffers full of newly allocated
579 * inodes. These buffers are only relogged with the XFS_BLI_INODE_BUF
580 * flag set, indicating that only the di_next_unlinked fields from the
581 * inodes in the buffers will be replayed during recovery. If the
582 * original newly allocated inode images have not yet been flushed
583 * when the buffer is so relogged, then we need to make sure that we
584 * keep the old images in the 'active' portion of the log. We do this
585 * by returning the original lsn of that transaction here rather than
589 xfs_buf_item_committed(
590 xfs_buf_log_item_t
*bip
,
593 trace_xfs_buf_item_committed(bip
);
595 if ((bip
->bli_flags
& XFS_BLI_INODE_ALLOC_BUF
) &&
596 (bip
->bli_item
.li_lsn
!= 0)) {
597 return bip
->bli_item
.li_lsn
;
603 * The buffer is locked, but is not a delayed write buffer. This happens
604 * if we race with IO completion and hence we don't want to try to write it
605 * again. Just release the buffer.
609 xfs_buf_log_item_t
*bip
)
613 ASSERT(!(bip
->bli_flags
& XFS_BLI_STALE
));
614 trace_xfs_buf_item_push(bip
);
617 ASSERT(!XFS_BUF_ISDELAYWRITE(bp
));
622 * The buffer is locked and is a delayed write buffer. Promote the buffer
623 * in the delayed write queue as the caller knows that they must invoke
624 * the xfsbufd to get this buffer written. We have to unlock the buffer
625 * to allow the xfsbufd to write it, too.
628 xfs_buf_item_pushbuf(
629 xfs_buf_log_item_t
*bip
)
633 ASSERT(!(bip
->bli_flags
& XFS_BLI_STALE
));
634 trace_xfs_buf_item_pushbuf(bip
);
637 ASSERT(XFS_BUF_ISDELAYWRITE(bp
));
638 xfs_buf_delwri_promote(bp
);
644 xfs_buf_item_committing(xfs_buf_log_item_t
*bip
, xfs_lsn_t commit_lsn
)
649 * This is the ops vector shared by all buf log items.
651 static struct xfs_item_ops xfs_buf_item_ops
= {
652 .iop_size
= (uint(*)(xfs_log_item_t
*))xfs_buf_item_size
,
653 .iop_format
= (void(*)(xfs_log_item_t
*, xfs_log_iovec_t
*))
655 .iop_pin
= (void(*)(xfs_log_item_t
*))xfs_buf_item_pin
,
656 .iop_unpin
= (void(*)(xfs_log_item_t
*, int))xfs_buf_item_unpin
,
657 .iop_trylock
= (uint(*)(xfs_log_item_t
*))xfs_buf_item_trylock
,
658 .iop_unlock
= (void(*)(xfs_log_item_t
*))xfs_buf_item_unlock
,
659 .iop_committed
= (xfs_lsn_t(*)(xfs_log_item_t
*, xfs_lsn_t
))
660 xfs_buf_item_committed
,
661 .iop_push
= (void(*)(xfs_log_item_t
*))xfs_buf_item_push
,
662 .iop_pushbuf
= (void(*)(xfs_log_item_t
*))xfs_buf_item_pushbuf
,
663 .iop_committing
= (void(*)(xfs_log_item_t
*, xfs_lsn_t
))
664 xfs_buf_item_committing
669 * Allocate a new buf log item to go with the given buffer.
670 * Set the buffer's b_fsprivate field to point to the new
671 * buf log item. If there are other item's attached to the
672 * buffer (see xfs_buf_attach_iodone() below), then put the
673 * buf log item at the front.
681 xfs_buf_log_item_t
*bip
;
686 * Check to see if there is already a buf log item for
687 * this buffer. If there is, it is guaranteed to be
688 * the first. If we do already have one, there is
689 * nothing to do here so return.
691 if (bp
->b_mount
!= mp
)
693 XFS_BUF_SET_BDSTRAT_FUNC(bp
, xfs_bdstrat_cb
);
694 if (XFS_BUF_FSPRIVATE(bp
, void *) != NULL
) {
695 lip
= XFS_BUF_FSPRIVATE(bp
, xfs_log_item_t
*);
696 if (lip
->li_type
== XFS_LI_BUF
) {
702 * chunks is the number of XFS_BLF_CHUNK size pieces
703 * the buffer can be divided into. Make sure not to
704 * truncate any pieces. map_size is the size of the
705 * bitmap needed to describe the chunks of the buffer.
707 chunks
= (int)((XFS_BUF_COUNT(bp
) + (XFS_BLF_CHUNK
- 1)) >> XFS_BLF_SHIFT
);
708 map_size
= (int)((chunks
+ NBWORD
) >> BIT_TO_WORD_SHIFT
);
710 bip
= (xfs_buf_log_item_t
*)kmem_zone_zalloc(xfs_buf_item_zone
,
712 xfs_log_item_init(mp
, &bip
->bli_item
, XFS_LI_BUF
, &xfs_buf_item_ops
);
715 bip
->bli_format
.blf_type
= XFS_LI_BUF
;
716 bip
->bli_format
.blf_blkno
= (__int64_t
)XFS_BUF_ADDR(bp
);
717 bip
->bli_format
.blf_len
= (ushort
)BTOBB(XFS_BUF_COUNT(bp
));
718 bip
->bli_format
.blf_map_size
= map_size
;
720 #ifdef XFS_TRANS_DEBUG
722 * Allocate the arrays for tracking what needs to be logged
723 * and what our callers request to be logged. bli_orig
724 * holds a copy of the original, clean buffer for comparison
725 * against, and bli_logged keeps a 1 bit flag per byte in
726 * the buffer to indicate which bytes the callers have asked
729 bip
->bli_orig
= (char *)kmem_alloc(XFS_BUF_COUNT(bp
), KM_SLEEP
);
730 memcpy(bip
->bli_orig
, XFS_BUF_PTR(bp
), XFS_BUF_COUNT(bp
));
731 bip
->bli_logged
= (char *)kmem_zalloc(XFS_BUF_COUNT(bp
) / NBBY
, KM_SLEEP
);
735 * Put the buf item into the list of items attached to the
736 * buffer at the front.
738 if (XFS_BUF_FSPRIVATE(bp
, void *) != NULL
) {
739 bip
->bli_item
.li_bio_list
=
740 XFS_BUF_FSPRIVATE(bp
, xfs_log_item_t
*);
742 XFS_BUF_SET_FSPRIVATE(bp
, bip
);
747 * Mark bytes first through last inclusive as dirty in the buf
752 xfs_buf_log_item_t
*bip
,
767 * Mark the item as having some dirty data for
768 * quick reference in xfs_buf_item_dirty.
770 bip
->bli_flags
|= XFS_BLI_DIRTY
;
773 * Convert byte offsets to bit numbers.
775 first_bit
= first
>> XFS_BLF_SHIFT
;
776 last_bit
= last
>> XFS_BLF_SHIFT
;
779 * Calculate the total number of bits to be set.
781 bits_to_set
= last_bit
- first_bit
+ 1;
784 * Get a pointer to the first word in the bitmap
787 word_num
= first_bit
>> BIT_TO_WORD_SHIFT
;
788 wordp
= &(bip
->bli_format
.blf_data_map
[word_num
]);
791 * Calculate the starting bit in the first word.
793 bit
= first_bit
& (uint
)(NBWORD
- 1);
796 * First set any bits in the first word of our range.
797 * If it starts at bit 0 of the word, it will be
798 * set below rather than here. That is what the variable
799 * bit tells us. The variable bits_set tracks the number
800 * of bits that have been set so far. End_bit is the number
801 * of the last bit to be set in this word plus one.
804 end_bit
= MIN(bit
+ bits_to_set
, (uint
)NBWORD
);
805 mask
= ((1 << (end_bit
- bit
)) - 1) << bit
;
808 bits_set
= end_bit
- bit
;
814 * Now set bits a whole word at a time that are between
815 * first_bit and last_bit.
817 while ((bits_to_set
- bits_set
) >= NBWORD
) {
818 *wordp
|= 0xffffffff;
824 * Finally, set any bits left to be set in one last partial word.
826 end_bit
= bits_to_set
- bits_set
;
828 mask
= (1 << end_bit
) - 1;
832 xfs_buf_item_log_debug(bip
, first
, last
);
837 * Return 1 if the buffer has some data that has been logged (at any
838 * point, not just the current transaction) and 0 if not.
842 xfs_buf_log_item_t
*bip
)
844 return (bip
->bli_flags
& XFS_BLI_DIRTY
);
849 xfs_buf_log_item_t
*bip
)
851 #ifdef XFS_TRANS_DEBUG
852 kmem_free(bip
->bli_orig
);
853 kmem_free(bip
->bli_logged
);
854 #endif /* XFS_TRANS_DEBUG */
856 kmem_zone_free(xfs_buf_item_zone
, bip
);
860 * This is called when the buf log item is no longer needed. It should
861 * free the buf log item associated with the given buffer and clear
862 * the buffer's pointer to the buf log item. If there are no more
863 * items in the list, clear the b_iodone field of the buffer (see
864 * xfs_buf_attach_iodone() below).
870 xfs_buf_log_item_t
*bip
;
872 trace_xfs_buf_item_relse(bp
, _RET_IP_
);
874 bip
= XFS_BUF_FSPRIVATE(bp
, xfs_buf_log_item_t
*);
875 XFS_BUF_SET_FSPRIVATE(bp
, bip
->bli_item
.li_bio_list
);
876 if ((XFS_BUF_FSPRIVATE(bp
, void *) == NULL
) &&
877 (XFS_BUF_IODONE_FUNC(bp
) != NULL
)) {
878 XFS_BUF_CLR_IODONE_FUNC(bp
);
881 xfs_buf_item_free(bip
);
886 * Add the given log item with its callback to the list of callbacks
887 * to be called when the buffer's I/O completes. If it is not set
888 * already, set the buffer's b_iodone() routine to be
889 * xfs_buf_iodone_callbacks() and link the log item into the list of
890 * items rooted at b_fsprivate. Items are always added as the second
891 * entry in the list if there is a first, because the buf item code
892 * assumes that the buf log item is first.
895 xfs_buf_attach_iodone(
897 void (*cb
)(xfs_buf_t
*, xfs_log_item_t
*),
900 xfs_log_item_t
*head_lip
;
902 ASSERT(XFS_BUF_ISBUSY(bp
));
903 ASSERT(XFS_BUF_VALUSEMA(bp
) <= 0);
906 if (XFS_BUF_FSPRIVATE(bp
, void *) != NULL
) {
907 head_lip
= XFS_BUF_FSPRIVATE(bp
, xfs_log_item_t
*);
908 lip
->li_bio_list
= head_lip
->li_bio_list
;
909 head_lip
->li_bio_list
= lip
;
911 XFS_BUF_SET_FSPRIVATE(bp
, lip
);
914 ASSERT((XFS_BUF_IODONE_FUNC(bp
) == xfs_buf_iodone_callbacks
) ||
915 (XFS_BUF_IODONE_FUNC(bp
) == NULL
));
916 XFS_BUF_SET_IODONE_FUNC(bp
, xfs_buf_iodone_callbacks
);
920 xfs_buf_do_callbacks(
924 xfs_log_item_t
*nlip
;
926 while (lip
!= NULL
) {
927 nlip
= lip
->li_bio_list
;
928 ASSERT(lip
->li_cb
!= NULL
);
930 * Clear the next pointer so we don't have any
931 * confusion if the item is added to another buf.
932 * Don't touch the log item after calling its
933 * callback, because it could have freed itself.
935 lip
->li_bio_list
= NULL
;
942 * This is the iodone() function for buffers which have had callbacks
943 * attached to them by xfs_buf_attach_iodone(). It should remove each
944 * log item from the buffer's list and call the callback of each in turn.
945 * When done, the buffer's fsprivate field is set to NULL and the buffer
946 * is unlocked with a call to iodone().
949 xfs_buf_iodone_callbacks(
953 static ulong lasttime
;
954 static xfs_buftarg_t
*lasttarg
;
957 ASSERT(XFS_BUF_FSPRIVATE(bp
, void *) != NULL
);
958 lip
= XFS_BUF_FSPRIVATE(bp
, xfs_log_item_t
*);
960 if (XFS_BUF_GETERROR(bp
) != 0) {
962 * If we've already decided to shutdown the filesystem
963 * because of IO errors, there's no point in giving this
967 if (XFS_FORCED_SHUTDOWN(mp
)) {
968 ASSERT(XFS_BUF_TARGET(bp
) == mp
->m_ddev_targp
);
969 XFS_BUF_SUPER_STALE(bp
);
970 trace_xfs_buf_item_iodone(bp
, _RET_IP_
);
971 xfs_buf_do_callbacks(bp
, lip
);
972 XFS_BUF_SET_FSPRIVATE(bp
, NULL
);
973 XFS_BUF_CLR_IODONE_FUNC(bp
);
978 if ((XFS_BUF_TARGET(bp
) != lasttarg
) ||
979 (time_after(jiffies
, (lasttime
+ 5*HZ
)))) {
981 cmn_err(CE_ALERT
, "Device %s, XFS metadata write error"
982 " block 0x%llx in %s",
983 XFS_BUFTARG_NAME(XFS_BUF_TARGET(bp
)),
984 (__uint64_t
)XFS_BUF_ADDR(bp
), mp
->m_fsname
);
986 lasttarg
= XFS_BUF_TARGET(bp
);
988 if (XFS_BUF_ISASYNC(bp
)) {
990 * If the write was asynchronous then noone will be
991 * looking for the error. Clear the error state
992 * and write the buffer out again delayed write.
994 * XXXsup This is OK, so long as we catch these
995 * before we start the umount; we don't want these
996 * DELWRI metadata bufs to be hanging around.
998 XFS_BUF_ERROR(bp
,0); /* errno of 0 unsets the flag */
1000 if (!(XFS_BUF_ISSTALE(bp
))) {
1001 XFS_BUF_DELAYWRITE(bp
);
1003 XFS_BUF_SET_START(bp
);
1005 ASSERT(XFS_BUF_IODONE_FUNC(bp
));
1006 trace_xfs_buf_item_iodone_async(bp
, _RET_IP_
);
1010 * If the write of the buffer was not asynchronous,
1011 * then we want to make sure to return the error
1012 * to the caller of bwrite(). Because of this we
1013 * cannot clear the B_ERROR state at this point.
1014 * Instead we install a callback function that
1015 * will be called when the buffer is released, and
1016 * that routine will clear the error state and
1017 * set the buffer to be written out again after
1020 /* We actually overwrite the existing b-relse
1021 function at times, but we're gonna be shutting down
1023 XFS_BUF_SET_BRELSE_FUNC(bp
,xfs_buf_error_relse
);
1025 XFS_BUF_FINISH_IOWAIT(bp
);
1030 xfs_buf_do_callbacks(bp
, lip
);
1031 XFS_BUF_SET_FSPRIVATE(bp
, NULL
);
1032 XFS_BUF_CLR_IODONE_FUNC(bp
);
1037 * This is a callback routine attached to a buffer which gets an error
1038 * when being written out synchronously.
1041 xfs_buf_error_relse(
1044 xfs_log_item_t
*lip
;
1047 lip
= XFS_BUF_FSPRIVATE(bp
, xfs_log_item_t
*);
1048 mp
= (xfs_mount_t
*)lip
->li_mountp
;
1049 ASSERT(XFS_BUF_TARGET(bp
) == mp
->m_ddev_targp
);
1053 XFS_BUF_UNDELAYWRITE(bp
);
1054 XFS_BUF_ERROR(bp
,0);
1056 trace_xfs_buf_error_relse(bp
, _RET_IP_
);
1058 if (! XFS_FORCED_SHUTDOWN(mp
))
1059 xfs_force_shutdown(mp
, SHUTDOWN_META_IO_ERROR
);
1061 * We have to unpin the pinned buffers so do the
1064 xfs_buf_do_callbacks(bp
, lip
);
1065 XFS_BUF_SET_FSPRIVATE(bp
, NULL
);
1066 XFS_BUF_CLR_IODONE_FUNC(bp
);
1067 XFS_BUF_SET_BRELSE_FUNC(bp
,NULL
);
1073 * This is the iodone() function for buffers which have been
1074 * logged. It is called when they are eventually flushed out.
1075 * It should remove the buf item from the AIL, and free the buf item.
1076 * It is called by xfs_buf_iodone_callbacks() above which will take
1077 * care of cleaning up the buffer itself.
1083 xfs_buf_log_item_t
*bip
)
1085 struct xfs_ail
*ailp
= bip
->bli_item
.li_ailp
;
1087 ASSERT(bip
->bli_buf
== bp
);
1092 * If we are forcibly shutting down, this may well be
1093 * off the AIL already. That's because we simulate the
1094 * log-committed callbacks to unpin these buffers. Or we may never
1095 * have put this item on AIL because of the transaction was
1096 * aborted forcibly. xfs_trans_ail_delete() takes care of these.
1098 * Either way, AIL is useless if we're forcing a shutdown.
1100 spin_lock(&ailp
->xa_lock
);
1101 xfs_trans_ail_delete(ailp
, (xfs_log_item_t
*)bip
);
1102 xfs_buf_item_free(bip
);