2 * Copyright (c) 2000-2006 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_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_btree.h"
27 #include "xfs_bmap_btree.h"
29 #include "xfs_bmap_util.h"
30 #include "xfs_error.h"
31 #include "xfs_trans.h"
32 #include "xfs_trans_space.h"
33 #include "xfs_iomap.h"
34 #include "xfs_trace.h"
35 #include "xfs_icache.h"
36 #include "xfs_quota.h"
37 #include "xfs_dquot_item.h"
38 #include "xfs_dquot.h"
41 #define XFS_WRITEIO_ALIGN(mp,off) (((off) >> mp->m_writeio_log) \
43 #define XFS_WRITE_IMAPS XFS_BMAP_MAX_NMAP
46 xfs_iomap_eof_align_last_fsb(
50 xfs_fileoff_t *last_fsb)
52 xfs_extlen_t align = 0;
55 if (!XFS_IS_REALTIME_INODE(ip)) {
57 * Round up the allocation request to a stripe unit
58 * (m_dalign) boundary if the file size is >= stripe unit
59 * size, and we are allocating past the allocation eof.
61 * If mounted with the "-o swalloc" option the alignment is
62 * increased from the strip unit size to the stripe width.
64 if (mp->m_swidth && (mp->m_flags & XFS_MOUNT_SWALLOC))
66 else if (mp->m_dalign)
69 if (align && XFS_ISIZE(ip) < XFS_FSB_TO_B(mp, align))
74 * Always round up the allocation request to an extent boundary
75 * (when file on a real-time subvolume or has di_extsize hint).
79 align = roundup_64(align, extsize);
85 xfs_fileoff_t new_last_fsb = roundup_64(*last_fsb, align);
86 error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof);
90 *last_fsb = new_last_fsb;
96 xfs_alert_fsblock_zero(
98 xfs_bmbt_irec_t *imap)
100 xfs_alert_tag(ip->i_mount, XFS_PTAG_FSBLOCK_ZERO,
101 "Access to block zero in inode %llu "
102 "start_block: %llx start_off: %llx "
103 "blkcnt: %llx extent-state: %x",
104 (unsigned long long)ip->i_ino,
105 (unsigned long long)imap->br_startblock,
106 (unsigned long long)imap->br_startoff,
107 (unsigned long long)imap->br_blockcount,
109 return -EFSCORRUPTED;
113 xfs_iomap_write_direct(
117 xfs_bmbt_irec_t *imap,
120 xfs_mount_t *mp = ip->i_mount;
121 xfs_fileoff_t offset_fsb;
122 xfs_fileoff_t last_fsb;
123 xfs_filblks_t count_fsb, resaligned;
124 xfs_fsblock_t firstfsb;
125 xfs_extlen_t extsz, temp;
130 xfs_bmap_free_t free_list;
131 uint qblocks, resblks, resrtextents;
135 error = xfs_qm_dqattach(ip, 0);
139 rt = XFS_IS_REALTIME_INODE(ip);
140 extsz = xfs_get_extsz_hint(ip);
142 offset_fsb = XFS_B_TO_FSBT(mp, offset);
143 last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count)));
144 if ((offset + count) > XFS_ISIZE(ip)) {
145 error = xfs_iomap_eof_align_last_fsb(mp, ip, extsz, &last_fsb);
149 if (nmaps && (imap->br_startblock == HOLESTARTBLOCK))
150 last_fsb = MIN(last_fsb, (xfs_fileoff_t)
151 imap->br_blockcount +
154 count_fsb = last_fsb - offset_fsb;
155 ASSERT(count_fsb > 0);
157 resaligned = count_fsb;
158 if (unlikely(extsz)) {
159 if ((temp = do_mod(offset_fsb, extsz)))
161 if ((temp = do_mod(resaligned, extsz)))
162 resaligned += extsz - temp;
166 resrtextents = qblocks = resaligned;
167 resrtextents /= mp->m_sb.sb_rextsize;
168 resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
169 quota_flag = XFS_QMOPT_RES_RTBLKS;
172 resblks = qblocks = XFS_DIOSTRAT_SPACE_RES(mp, resaligned);
173 quota_flag = XFS_QMOPT_RES_REGBLKS;
177 * Allocate and setup the transaction
179 tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);
180 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_write,
181 resblks, resrtextents);
183 * Check for running out of space, note: need lock to return
186 xfs_trans_cancel(tp, 0);
190 xfs_ilock(ip, XFS_ILOCK_EXCL);
192 error = xfs_trans_reserve_quota_nblks(tp, ip, qblocks, 0, quota_flag);
194 goto out_trans_cancel;
196 xfs_trans_ijoin(tp, ip, 0);
199 * From this point onwards we overwrite the imap pointer that the
202 xfs_bmap_init(&free_list, &firstfsb);
204 error = xfs_bmapi_write(tp, ip, offset_fsb, count_fsb,
205 XFS_BMAPI_PREALLOC, &firstfsb, 0,
206 imap, &nimaps, &free_list);
208 goto out_bmap_cancel;
211 * Complete the transaction
213 error = xfs_bmap_finish(&tp, &free_list, &committed);
215 goto out_bmap_cancel;
216 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
221 * Copy any maps to caller's array and return any error.
228 if (!(imap->br_startblock || XFS_IS_REALTIME_INODE(ip)))
229 error = xfs_alert_fsblock_zero(ip, imap);
232 xfs_iunlock(ip, XFS_ILOCK_EXCL);
236 xfs_bmap_cancel(&free_list);
237 xfs_trans_unreserve_quota_nblks(tp, ip, (long)qblocks, 0, quota_flag);
239 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
244 * If the caller is doing a write at the end of the file, then extend the
245 * allocation out to the file system's write iosize. We clean up any extra
246 * space left over when the file is closed in xfs_inactive().
248 * If we find we already have delalloc preallocation beyond EOF, don't do more
249 * preallocation as it it not needed.
252 xfs_iomap_eof_want_preallocate(
257 xfs_bmbt_irec_t *imap,
261 xfs_fileoff_t start_fsb;
262 xfs_filblks_t count_fsb;
264 int found_delalloc = 0;
267 if (offset + count <= XFS_ISIZE(ip))
271 * If the file is smaller than the minimum prealloc and we are using
272 * dynamic preallocation, don't do any preallocation at all as it is
273 * likely this is the only write to the file that is going to be done.
275 if (!(mp->m_flags & XFS_MOUNT_DFLT_IOSIZE) &&
276 XFS_ISIZE(ip) < XFS_FSB_TO_B(mp, mp->m_writeio_blocks))
280 * If there are any real blocks past eof, then don't
281 * do any speculative allocation.
283 start_fsb = XFS_B_TO_FSBT(mp, ((xfs_ufsize_t)(offset + count - 1)));
284 count_fsb = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
285 while (count_fsb > 0) {
287 error = xfs_bmapi_read(ip, start_fsb, count_fsb, imap, &imaps,
291 for (n = 0; n < imaps; n++) {
292 if ((imap[n].br_startblock != HOLESTARTBLOCK) &&
293 (imap[n].br_startblock != DELAYSTARTBLOCK))
295 start_fsb += imap[n].br_blockcount;
296 count_fsb -= imap[n].br_blockcount;
298 if (imap[n].br_startblock == DELAYSTARTBLOCK)
308 * Determine the initial size of the preallocation. We are beyond the current
309 * EOF here, but we need to take into account whether this is a sparse write or
310 * an extending write when determining the preallocation size. Hence we need to
311 * look up the extent that ends at the current write offset and use the result
312 * to determine the preallocation size.
314 * If the extent is a hole, then preallocation is essentially disabled.
315 * Otherwise we take the size of the preceeding data extent as the basis for the
316 * preallocation size. If the size of the extent is greater than half the
317 * maximum extent length, then use the current offset as the basis. This ensures
318 * that for large files the preallocation size always extends to MAXEXTLEN
319 * rather than falling short due to things like stripe unit/width alignment of
323 xfs_iomap_eof_prealloc_initial_size(
324 struct xfs_mount *mp,
325 struct xfs_inode *ip,
327 xfs_bmbt_irec_t *imap,
330 xfs_fileoff_t start_fsb;
334 ASSERT(nimaps >= imaps);
336 /* if we are using a specific prealloc size, return now */
337 if (mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)
340 /* If the file is small, then use the minimum prealloc */
341 if (XFS_ISIZE(ip) < XFS_FSB_TO_B(mp, mp->m_dalign))
345 * As we write multiple pages, the offset will always align to the
346 * start of a page and hence point to a hole at EOF. i.e. if the size is
347 * 4096 bytes, we only have one block at FSB 0, but XFS_B_TO_FSB(4096)
348 * will return FSB 1. Hence if there are blocks in the file, we want to
349 * point to the block prior to the EOF block and not the hole that maps
350 * directly at @offset.
352 start_fsb = XFS_B_TO_FSB(mp, offset);
355 error = xfs_bmapi_read(ip, start_fsb, 1, imap, &imaps, XFS_BMAPI_ENTIRE);
360 if (imap[0].br_startblock == HOLESTARTBLOCK)
362 if (imap[0].br_blockcount <= (MAXEXTLEN >> 1))
363 return imap[0].br_blockcount << 1;
364 return XFS_B_TO_FSB(mp, offset);
368 xfs_quota_need_throttle(
369 struct xfs_inode *ip,
371 xfs_fsblock_t alloc_blocks)
373 struct xfs_dquot *dq = xfs_inode_dquot(ip, type);
375 if (!dq || !xfs_this_quota_on(ip->i_mount, type))
378 /* no hi watermark, no throttle */
379 if (!dq->q_prealloc_hi_wmark)
382 /* under the lo watermark, no throttle */
383 if (dq->q_res_bcount + alloc_blocks < dq->q_prealloc_lo_wmark)
390 xfs_quota_calc_throttle(
391 struct xfs_inode *ip,
393 xfs_fsblock_t *qblocks,
399 struct xfs_dquot *dq = xfs_inode_dquot(ip, type);
401 /* no dq, or over hi wmark, squash the prealloc completely */
402 if (!dq || dq->q_res_bcount >= dq->q_prealloc_hi_wmark) {
408 freesp = dq->q_prealloc_hi_wmark - dq->q_res_bcount;
409 if (freesp < dq->q_low_space[XFS_QLOWSP_5_PCNT]) {
411 if (freesp < dq->q_low_space[XFS_QLOWSP_3_PCNT])
413 if (freesp < dq->q_low_space[XFS_QLOWSP_1_PCNT])
417 if (freesp < *qfreesp)
420 /* only overwrite the throttle values if we are more aggressive */
421 if ((freesp >> shift) < (*qblocks >> *qshift)) {
428 * If we don't have a user specified preallocation size, dynamically increase
429 * the preallocation size as the size of the file grows. Cap the maximum size
430 * at a single extent or less if the filesystem is near full. The closer the
431 * filesystem is to full, the smaller the maximum prealocation.
434 xfs_iomap_prealloc_size(
435 struct xfs_mount *mp,
436 struct xfs_inode *ip,
438 struct xfs_bmbt_irec *imap,
441 xfs_fsblock_t alloc_blocks = 0;
444 xfs_fsblock_t qblocks;
447 alloc_blocks = xfs_iomap_eof_prealloc_initial_size(mp, ip, offset,
451 qblocks = alloc_blocks;
454 * MAXEXTLEN is not a power of two value but we round the prealloc down
455 * to the nearest power of two value after throttling. To prevent the
456 * round down from unconditionally reducing the maximum supported prealloc
457 * size, we round up first, apply appropriate throttling, round down and
458 * cap the value to MAXEXTLEN.
460 alloc_blocks = XFS_FILEOFF_MIN(roundup_pow_of_two(MAXEXTLEN),
463 xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT);
464 freesp = mp->m_sb.sb_fdblocks;
465 if (freesp < mp->m_low_space[XFS_LOWSP_5_PCNT]) {
467 if (freesp < mp->m_low_space[XFS_LOWSP_4_PCNT])
469 if (freesp < mp->m_low_space[XFS_LOWSP_3_PCNT])
471 if (freesp < mp->m_low_space[XFS_LOWSP_2_PCNT])
473 if (freesp < mp->m_low_space[XFS_LOWSP_1_PCNT])
478 * Check each quota to cap the prealloc size, provide a shift value to
479 * throttle with and adjust amount of available space.
481 if (xfs_quota_need_throttle(ip, XFS_DQ_USER, alloc_blocks))
482 xfs_quota_calc_throttle(ip, XFS_DQ_USER, &qblocks, &qshift,
484 if (xfs_quota_need_throttle(ip, XFS_DQ_GROUP, alloc_blocks))
485 xfs_quota_calc_throttle(ip, XFS_DQ_GROUP, &qblocks, &qshift,
487 if (xfs_quota_need_throttle(ip, XFS_DQ_PROJ, alloc_blocks))
488 xfs_quota_calc_throttle(ip, XFS_DQ_PROJ, &qblocks, &qshift,
492 * The final prealloc size is set to the minimum of free space available
493 * in each of the quotas and the overall filesystem.
495 * The shift throttle value is set to the maximum value as determined by
496 * the global low free space values and per-quota low free space values.
498 alloc_blocks = MIN(alloc_blocks, qblocks);
499 shift = MAX(shift, qshift);
502 alloc_blocks >>= shift;
504 * rounddown_pow_of_two() returns an undefined result if we pass in
508 alloc_blocks = rounddown_pow_of_two(alloc_blocks);
509 if (alloc_blocks > MAXEXTLEN)
510 alloc_blocks = MAXEXTLEN;
513 * If we are still trying to allocate more space than is
514 * available, squash the prealloc hard. This can happen if we
515 * have a large file on a small filesystem and the above
516 * lowspace thresholds are smaller than MAXEXTLEN.
518 while (alloc_blocks && alloc_blocks >= freesp)
522 if (alloc_blocks < mp->m_writeio_blocks)
523 alloc_blocks = mp->m_writeio_blocks;
525 trace_xfs_iomap_prealloc_size(ip, alloc_blocks, shift,
526 mp->m_writeio_blocks);
532 xfs_iomap_write_delay(
536 xfs_bmbt_irec_t *ret_imap)
538 xfs_mount_t *mp = ip->i_mount;
539 xfs_fileoff_t offset_fsb;
540 xfs_fileoff_t last_fsb;
541 xfs_off_t aligned_offset;
542 xfs_fileoff_t ioalign;
545 xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS];
549 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
552 * Make sure that the dquots are there. This doesn't hold
553 * the ilock across a disk read.
555 error = xfs_qm_dqattach_locked(ip, 0);
559 extsz = xfs_get_extsz_hint(ip);
560 offset_fsb = XFS_B_TO_FSBT(mp, offset);
562 error = xfs_iomap_eof_want_preallocate(mp, ip, offset, count,
563 imap, XFS_WRITE_IMAPS, &prealloc);
569 xfs_fsblock_t alloc_blocks;
571 alloc_blocks = xfs_iomap_prealloc_size(mp, ip, offset, imap,
574 aligned_offset = XFS_WRITEIO_ALIGN(mp, (offset + count - 1));
575 ioalign = XFS_B_TO_FSBT(mp, aligned_offset);
576 last_fsb = ioalign + alloc_blocks;
578 last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count)));
581 if (prealloc || extsz) {
582 error = xfs_iomap_eof_align_last_fsb(mp, ip, extsz, &last_fsb);
588 * Make sure preallocation does not create extents beyond the range we
589 * actually support in this filesystem.
591 if (last_fsb > XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes))
592 last_fsb = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
594 ASSERT(last_fsb > offset_fsb);
596 nimaps = XFS_WRITE_IMAPS;
597 error = xfs_bmapi_delay(ip, offset_fsb, last_fsb - offset_fsb,
598 imap, &nimaps, XFS_BMAPI_ENTIRE);
609 * If bmapi returned us nothing, we got either ENOSPC or EDQUOT. Retry
610 * without EOF preallocation.
613 trace_xfs_delalloc_enospc(ip, offset, count);
619 return error ? error : -ENOSPC;
622 if (!(imap[0].br_startblock || XFS_IS_REALTIME_INODE(ip)))
623 return xfs_alert_fsblock_zero(ip, &imap[0]);
626 * Tag the inode as speculatively preallocated so we can reclaim this
627 * space on demand, if necessary.
630 xfs_inode_set_eofblocks_tag(ip);
637 * Pass in a delayed allocate extent, convert it to real extents;
638 * return to the caller the extent we create which maps on top of
639 * the originating callers request.
641 * Called without a lock on the inode.
643 * We no longer bother to look at the incoming map - all we have to
644 * guarantee is that whatever we allocate fills the required range.
647 xfs_iomap_write_allocate(
650 xfs_bmbt_irec_t *imap)
652 xfs_mount_t *mp = ip->i_mount;
653 xfs_fileoff_t offset_fsb, last_block;
654 xfs_fileoff_t end_fsb, map_start_fsb;
655 xfs_fsblock_t first_block;
656 xfs_bmap_free_t free_list;
657 xfs_filblks_t count_fsb;
659 int nimaps, committed;
664 * Make sure that the dquots are there.
666 error = xfs_qm_dqattach(ip, 0);
670 offset_fsb = XFS_B_TO_FSBT(mp, offset);
671 count_fsb = imap->br_blockcount;
672 map_start_fsb = imap->br_startoff;
674 XFS_STATS_ADD(xs_xstrat_bytes, XFS_FSB_TO_B(mp, count_fsb));
676 while (count_fsb != 0) {
678 * Set up a transaction with which to allocate the
679 * backing store for the file. Do allocations in a
680 * loop until we get some space in the range we are
681 * interested in. The other space that might be allocated
682 * is in the delayed allocation extent on which we sit
683 * but before our buffer starts.
687 while (nimaps == 0) {
688 tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE);
689 tp->t_flags |= XFS_TRANS_RESERVE;
690 nres = XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK);
691 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_write,
694 xfs_trans_cancel(tp, 0);
697 xfs_ilock(ip, XFS_ILOCK_EXCL);
698 xfs_trans_ijoin(tp, ip, 0);
700 xfs_bmap_init(&free_list, &first_block);
703 * it is possible that the extents have changed since
704 * we did the read call as we dropped the ilock for a
705 * while. We have to be careful about truncates or hole
706 * punchs here - we are not allowed to allocate
707 * non-delalloc blocks here.
709 * The only protection against truncation is the pages
710 * for the range we are being asked to convert are
711 * locked and hence a truncate will block on them
714 * As a result, if we go beyond the range we really
715 * need and hit an delalloc extent boundary followed by
716 * a hole while we have excess blocks in the map, we
717 * will fill the hole incorrectly and overrun the
718 * transaction reservation.
720 * Using a single map prevents this as we are forced to
721 * check each map we look for overlap with the desired
722 * range and abort as soon as we find it. Also, given
723 * that we only return a single map, having one beyond
724 * what we can return is probably a bit silly.
726 * We also need to check that we don't go beyond EOF;
727 * this is a truncate optimisation as a truncate sets
728 * the new file size before block on the pages we
729 * currently have locked under writeback. Because they
730 * are about to be tossed, we don't need to write them
734 end_fsb = XFS_B_TO_FSB(mp, XFS_ISIZE(ip));
735 error = xfs_bmap_last_offset(ip, &last_block,
740 last_block = XFS_FILEOFF_MAX(last_block, end_fsb);
741 if ((map_start_fsb + count_fsb) > last_block) {
742 count_fsb = last_block - map_start_fsb;
743 if (count_fsb == 0) {
750 * From this point onwards we overwrite the imap
751 * pointer that the caller gave to us.
753 error = xfs_bmapi_write(tp, ip, map_start_fsb,
756 imap, &nimaps, &free_list);
760 error = xfs_bmap_finish(&tp, &free_list, &committed);
764 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
768 xfs_iunlock(ip, XFS_ILOCK_EXCL);
772 * See if we were able to allocate an extent that
773 * covers at least part of the callers request
775 if (!(imap->br_startblock || XFS_IS_REALTIME_INODE(ip)))
776 return xfs_alert_fsblock_zero(ip, imap);
778 if ((offset_fsb >= imap->br_startoff) &&
779 (offset_fsb < (imap->br_startoff +
780 imap->br_blockcount))) {
781 XFS_STATS_INC(xs_xstrat_quick);
786 * So far we have not mapped the requested part of the
787 * file, just surrounding data, try again.
789 count_fsb -= imap->br_blockcount;
790 map_start_fsb = imap->br_startoff + imap->br_blockcount;
794 xfs_bmap_cancel(&free_list);
795 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
797 xfs_iunlock(ip, XFS_ILOCK_EXCL);
802 xfs_iomap_write_unwritten(
807 xfs_mount_t *mp = ip->i_mount;
808 xfs_fileoff_t offset_fsb;
809 xfs_filblks_t count_fsb;
810 xfs_filblks_t numblks_fsb;
811 xfs_fsblock_t firstfsb;
814 xfs_bmbt_irec_t imap;
815 xfs_bmap_free_t free_list;
821 trace_xfs_unwritten_convert(ip, offset, count);
823 offset_fsb = XFS_B_TO_FSBT(mp, offset);
824 count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count);
825 count_fsb = (xfs_filblks_t)(count_fsb - offset_fsb);
828 * Reserve enough blocks in this transaction for two complete extent
829 * btree splits. We may be converting the middle part of an unwritten
830 * extent and in this case we will insert two new extents in the btree
831 * each of which could cause a full split.
833 * This reservation amount will be used in the first call to
834 * xfs_bmbt_split() to select an AG with enough space to satisfy the
835 * rest of the operation.
837 resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0) << 1;
841 * set up a transaction to convert the range of extents
842 * from unwritten to real. Do allocations in a loop until
843 * we have covered the range passed in.
845 * Note that we open code the transaction allocation here
846 * to pass KM_NOFS--we can't risk to recursing back into
847 * the filesystem here as we might be asked to write out
848 * the same inode that we complete here and might deadlock
851 sb_start_intwrite(mp->m_super);
852 tp = _xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE, KM_NOFS);
853 tp->t_flags |= XFS_TRANS_RESERVE | XFS_TRANS_FREEZE_PROT;
854 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_write,
857 xfs_trans_cancel(tp, 0);
861 xfs_ilock(ip, XFS_ILOCK_EXCL);
862 xfs_trans_ijoin(tp, ip, 0);
865 * Modify the unwritten extent state of the buffer.
867 xfs_bmap_init(&free_list, &firstfsb);
869 error = xfs_bmapi_write(tp, ip, offset_fsb, count_fsb,
870 XFS_BMAPI_CONVERT, &firstfsb,
871 1, &imap, &nimaps, &free_list);
873 goto error_on_bmapi_transaction;
876 * Log the updated inode size as we go. We have to be careful
877 * to only log it up to the actual write offset if it is
878 * halfway into a block.
880 i_size = XFS_FSB_TO_B(mp, offset_fsb + count_fsb);
881 if (i_size > offset + count)
882 i_size = offset + count;
884 i_size = xfs_new_eof(ip, i_size);
886 ip->i_d.di_size = i_size;
887 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
890 error = xfs_bmap_finish(&tp, &free_list, &committed);
892 goto error_on_bmapi_transaction;
894 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
895 xfs_iunlock(ip, XFS_ILOCK_EXCL);
899 if (!(imap.br_startblock || XFS_IS_REALTIME_INODE(ip)))
900 return xfs_alert_fsblock_zero(ip, &imap);
902 if ((numblks_fsb = imap.br_blockcount) == 0) {
904 * The numblks_fsb value should always get
905 * smaller, otherwise the loop is stuck.
907 ASSERT(imap.br_blockcount);
910 offset_fsb += numblks_fsb;
911 count_fsb -= numblks_fsb;
912 } while (count_fsb > 0);
916 error_on_bmapi_transaction:
917 xfs_bmap_cancel(&free_list);
918 xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT));
919 xfs_iunlock(ip, XFS_ILOCK_EXCL);