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;
136 rt = XFS_IS_REALTIME_INODE(ip);
137 extsz = xfs_get_extsz_hint(ip);
138 lockmode = XFS_ILOCK_SHARED; /* locked by caller */
140 ASSERT(xfs_isilocked(ip, lockmode));
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)) {
146 * Assert that the in-core extent list is present since this can
147 * call xfs_iread_extents() and we only have the ilock shared.
148 * This should be safe because the lock was held around a bmapi
149 * call in the caller and we only need it to access the in-core
152 ASSERT(XFS_IFORK_PTR(ip, XFS_DATA_FORK)->if_flags &
154 error = xfs_iomap_eof_align_last_fsb(mp, ip, extsz, &last_fsb);
158 if (nmaps && (imap->br_startblock == HOLESTARTBLOCK))
159 last_fsb = MIN(last_fsb, (xfs_fileoff_t)
160 imap->br_blockcount +
163 count_fsb = last_fsb - offset_fsb;
164 ASSERT(count_fsb > 0);
166 resaligned = count_fsb;
167 if (unlikely(extsz)) {
168 if ((temp = do_mod(offset_fsb, extsz)))
170 if ((temp = do_mod(resaligned, extsz)))
171 resaligned += extsz - temp;
175 resrtextents = qblocks = resaligned;
176 resrtextents /= mp->m_sb.sb_rextsize;
177 resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
178 quota_flag = XFS_QMOPT_RES_RTBLKS;
181 resblks = qblocks = XFS_DIOSTRAT_SPACE_RES(mp, resaligned);
182 quota_flag = XFS_QMOPT_RES_REGBLKS;
186 * Drop the shared lock acquired by the caller, attach the dquot if
187 * necessary and move on to transaction setup.
189 xfs_iunlock(ip, lockmode);
190 error = xfs_qm_dqattach(ip, 0);
195 * Allocate and setup the transaction
197 tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);
198 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_write,
199 resblks, resrtextents);
201 * Check for running out of space, note: need lock to return
204 xfs_trans_cancel(tp);
208 lockmode = XFS_ILOCK_EXCL;
209 xfs_ilock(ip, lockmode);
211 error = xfs_trans_reserve_quota_nblks(tp, ip, qblocks, 0, quota_flag);
213 goto out_trans_cancel;
215 xfs_trans_ijoin(tp, ip, 0);
218 * From this point onwards we overwrite the imap pointer that the
221 xfs_bmap_init(&free_list, &firstfsb);
223 error = xfs_bmapi_write(tp, ip, offset_fsb, count_fsb,
224 XFS_BMAPI_PREALLOC, &firstfsb, resblks, imap,
225 &nimaps, &free_list);
227 goto out_bmap_cancel;
230 * Complete the transaction
232 error = xfs_bmap_finish(&tp, &free_list, &committed);
234 goto out_bmap_cancel;
235 error = xfs_trans_commit(tp);
240 * Copy any maps to caller's array and return any error.
247 if (!(imap->br_startblock || XFS_IS_REALTIME_INODE(ip)))
248 error = xfs_alert_fsblock_zero(ip, imap);
251 xfs_iunlock(ip, lockmode);
255 xfs_bmap_cancel(&free_list);
256 xfs_trans_unreserve_quota_nblks(tp, ip, (long)qblocks, 0, quota_flag);
258 xfs_trans_cancel(tp);
263 * If the caller is doing a write at the end of the file, then extend the
264 * allocation out to the file system's write iosize. We clean up any extra
265 * space left over when the file is closed in xfs_inactive().
267 * If we find we already have delalloc preallocation beyond EOF, don't do more
268 * preallocation as it it not needed.
271 xfs_iomap_eof_want_preallocate(
276 xfs_bmbt_irec_t *imap,
280 xfs_fileoff_t start_fsb;
281 xfs_filblks_t count_fsb;
283 int found_delalloc = 0;
286 if (offset + count <= XFS_ISIZE(ip))
290 * If the file is smaller than the minimum prealloc and we are using
291 * dynamic preallocation, don't do any preallocation at all as it is
292 * likely this is the only write to the file that is going to be done.
294 if (!(mp->m_flags & XFS_MOUNT_DFLT_IOSIZE) &&
295 XFS_ISIZE(ip) < XFS_FSB_TO_B(mp, mp->m_writeio_blocks))
299 * If there are any real blocks past eof, then don't
300 * do any speculative allocation.
302 start_fsb = XFS_B_TO_FSBT(mp, ((xfs_ufsize_t)(offset + count - 1)));
303 count_fsb = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
304 while (count_fsb > 0) {
306 error = xfs_bmapi_read(ip, start_fsb, count_fsb, imap, &imaps,
310 for (n = 0; n < imaps; n++) {
311 if ((imap[n].br_startblock != HOLESTARTBLOCK) &&
312 (imap[n].br_startblock != DELAYSTARTBLOCK))
314 start_fsb += imap[n].br_blockcount;
315 count_fsb -= imap[n].br_blockcount;
317 if (imap[n].br_startblock == DELAYSTARTBLOCK)
327 * Determine the initial size of the preallocation. We are beyond the current
328 * EOF here, but we need to take into account whether this is a sparse write or
329 * an extending write when determining the preallocation size. Hence we need to
330 * look up the extent that ends at the current write offset and use the result
331 * to determine the preallocation size.
333 * If the extent is a hole, then preallocation is essentially disabled.
334 * Otherwise we take the size of the preceeding data extent as the basis for the
335 * preallocation size. If the size of the extent is greater than half the
336 * maximum extent length, then use the current offset as the basis. This ensures
337 * that for large files the preallocation size always extends to MAXEXTLEN
338 * rather than falling short due to things like stripe unit/width alignment of
342 xfs_iomap_eof_prealloc_initial_size(
343 struct xfs_mount *mp,
344 struct xfs_inode *ip,
346 xfs_bmbt_irec_t *imap,
349 xfs_fileoff_t start_fsb;
353 ASSERT(nimaps >= imaps);
355 /* if we are using a specific prealloc size, return now */
356 if (mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)
359 /* If the file is small, then use the minimum prealloc */
360 if (XFS_ISIZE(ip) < XFS_FSB_TO_B(mp, mp->m_dalign))
364 * As we write multiple pages, the offset will always align to the
365 * start of a page and hence point to a hole at EOF. i.e. if the size is
366 * 4096 bytes, we only have one block at FSB 0, but XFS_B_TO_FSB(4096)
367 * will return FSB 1. Hence if there are blocks in the file, we want to
368 * point to the block prior to the EOF block and not the hole that maps
369 * directly at @offset.
371 start_fsb = XFS_B_TO_FSB(mp, offset);
374 error = xfs_bmapi_read(ip, start_fsb, 1, imap, &imaps, XFS_BMAPI_ENTIRE);
379 if (imap[0].br_startblock == HOLESTARTBLOCK)
381 if (imap[0].br_blockcount <= (MAXEXTLEN >> 1))
382 return imap[0].br_blockcount << 1;
383 return XFS_B_TO_FSB(mp, offset);
387 xfs_quota_need_throttle(
388 struct xfs_inode *ip,
390 xfs_fsblock_t alloc_blocks)
392 struct xfs_dquot *dq = xfs_inode_dquot(ip, type);
394 if (!dq || !xfs_this_quota_on(ip->i_mount, type))
397 /* no hi watermark, no throttle */
398 if (!dq->q_prealloc_hi_wmark)
401 /* under the lo watermark, no throttle */
402 if (dq->q_res_bcount + alloc_blocks < dq->q_prealloc_lo_wmark)
409 xfs_quota_calc_throttle(
410 struct xfs_inode *ip,
412 xfs_fsblock_t *qblocks,
418 struct xfs_dquot *dq = xfs_inode_dquot(ip, type);
420 /* no dq, or over hi wmark, squash the prealloc completely */
421 if (!dq || dq->q_res_bcount >= dq->q_prealloc_hi_wmark) {
427 freesp = dq->q_prealloc_hi_wmark - dq->q_res_bcount;
428 if (freesp < dq->q_low_space[XFS_QLOWSP_5_PCNT]) {
430 if (freesp < dq->q_low_space[XFS_QLOWSP_3_PCNT])
432 if (freesp < dq->q_low_space[XFS_QLOWSP_1_PCNT])
436 if (freesp < *qfreesp)
439 /* only overwrite the throttle values if we are more aggressive */
440 if ((freesp >> shift) < (*qblocks >> *qshift)) {
447 * If we don't have a user specified preallocation size, dynamically increase
448 * the preallocation size as the size of the file grows. Cap the maximum size
449 * at a single extent or less if the filesystem is near full. The closer the
450 * filesystem is to full, the smaller the maximum prealocation.
453 xfs_iomap_prealloc_size(
454 struct xfs_mount *mp,
455 struct xfs_inode *ip,
457 struct xfs_bmbt_irec *imap,
460 xfs_fsblock_t alloc_blocks = 0;
463 xfs_fsblock_t qblocks;
466 alloc_blocks = xfs_iomap_eof_prealloc_initial_size(mp, ip, offset,
470 qblocks = alloc_blocks;
473 * MAXEXTLEN is not a power of two value but we round the prealloc down
474 * to the nearest power of two value after throttling. To prevent the
475 * round down from unconditionally reducing the maximum supported prealloc
476 * size, we round up first, apply appropriate throttling, round down and
477 * cap the value to MAXEXTLEN.
479 alloc_blocks = XFS_FILEOFF_MIN(roundup_pow_of_two(MAXEXTLEN),
482 freesp = percpu_counter_read_positive(&mp->m_fdblocks);
483 if (freesp < mp->m_low_space[XFS_LOWSP_5_PCNT]) {
485 if (freesp < mp->m_low_space[XFS_LOWSP_4_PCNT])
487 if (freesp < mp->m_low_space[XFS_LOWSP_3_PCNT])
489 if (freesp < mp->m_low_space[XFS_LOWSP_2_PCNT])
491 if (freesp < mp->m_low_space[XFS_LOWSP_1_PCNT])
496 * Check each quota to cap the prealloc size, provide a shift value to
497 * throttle with and adjust amount of available space.
499 if (xfs_quota_need_throttle(ip, XFS_DQ_USER, alloc_blocks))
500 xfs_quota_calc_throttle(ip, XFS_DQ_USER, &qblocks, &qshift,
502 if (xfs_quota_need_throttle(ip, XFS_DQ_GROUP, alloc_blocks))
503 xfs_quota_calc_throttle(ip, XFS_DQ_GROUP, &qblocks, &qshift,
505 if (xfs_quota_need_throttle(ip, XFS_DQ_PROJ, alloc_blocks))
506 xfs_quota_calc_throttle(ip, XFS_DQ_PROJ, &qblocks, &qshift,
510 * The final prealloc size is set to the minimum of free space available
511 * in each of the quotas and the overall filesystem.
513 * The shift throttle value is set to the maximum value as determined by
514 * the global low free space values and per-quota low free space values.
516 alloc_blocks = MIN(alloc_blocks, qblocks);
517 shift = MAX(shift, qshift);
520 alloc_blocks >>= shift;
522 * rounddown_pow_of_two() returns an undefined result if we pass in
526 alloc_blocks = rounddown_pow_of_two(alloc_blocks);
527 if (alloc_blocks > MAXEXTLEN)
528 alloc_blocks = MAXEXTLEN;
531 * If we are still trying to allocate more space than is
532 * available, squash the prealloc hard. This can happen if we
533 * have a large file on a small filesystem and the above
534 * lowspace thresholds are smaller than MAXEXTLEN.
536 while (alloc_blocks && alloc_blocks >= freesp)
540 if (alloc_blocks < mp->m_writeio_blocks)
541 alloc_blocks = mp->m_writeio_blocks;
543 trace_xfs_iomap_prealloc_size(ip, alloc_blocks, shift,
544 mp->m_writeio_blocks);
550 xfs_iomap_write_delay(
554 xfs_bmbt_irec_t *ret_imap)
556 xfs_mount_t *mp = ip->i_mount;
557 xfs_fileoff_t offset_fsb;
558 xfs_fileoff_t last_fsb;
559 xfs_off_t aligned_offset;
560 xfs_fileoff_t ioalign;
563 xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS];
567 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
570 * Make sure that the dquots are there. This doesn't hold
571 * the ilock across a disk read.
573 error = xfs_qm_dqattach_locked(ip, 0);
577 extsz = xfs_get_extsz_hint(ip);
578 offset_fsb = XFS_B_TO_FSBT(mp, offset);
580 error = xfs_iomap_eof_want_preallocate(mp, ip, offset, count,
581 imap, XFS_WRITE_IMAPS, &prealloc);
587 xfs_fsblock_t alloc_blocks;
589 alloc_blocks = xfs_iomap_prealloc_size(mp, ip, offset, imap,
592 aligned_offset = XFS_WRITEIO_ALIGN(mp, (offset + count - 1));
593 ioalign = XFS_B_TO_FSBT(mp, aligned_offset);
594 last_fsb = ioalign + alloc_blocks;
596 last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count)));
599 if (prealloc || extsz) {
600 error = xfs_iomap_eof_align_last_fsb(mp, ip, extsz, &last_fsb);
606 * Make sure preallocation does not create extents beyond the range we
607 * actually support in this filesystem.
609 if (last_fsb > XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes))
610 last_fsb = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
612 ASSERT(last_fsb > offset_fsb);
614 nimaps = XFS_WRITE_IMAPS;
615 error = xfs_bmapi_delay(ip, offset_fsb, last_fsb - offset_fsb,
616 imap, &nimaps, XFS_BMAPI_ENTIRE);
627 * If bmapi returned us nothing, we got either ENOSPC or EDQUOT. Retry
628 * without EOF preallocation.
631 trace_xfs_delalloc_enospc(ip, offset, count);
637 return error ? error : -ENOSPC;
640 if (!(imap[0].br_startblock || XFS_IS_REALTIME_INODE(ip)))
641 return xfs_alert_fsblock_zero(ip, &imap[0]);
644 * Tag the inode as speculatively preallocated so we can reclaim this
645 * space on demand, if necessary.
648 xfs_inode_set_eofblocks_tag(ip);
655 * Pass in a delayed allocate extent, convert it to real extents;
656 * return to the caller the extent we create which maps on top of
657 * the originating callers request.
659 * Called without a lock on the inode.
661 * We no longer bother to look at the incoming map - all we have to
662 * guarantee is that whatever we allocate fills the required range.
665 xfs_iomap_write_allocate(
668 xfs_bmbt_irec_t *imap)
670 xfs_mount_t *mp = ip->i_mount;
671 xfs_fileoff_t offset_fsb, last_block;
672 xfs_fileoff_t end_fsb, map_start_fsb;
673 xfs_fsblock_t first_block;
674 xfs_bmap_free_t free_list;
675 xfs_filblks_t count_fsb;
677 int nimaps, committed;
682 * Make sure that the dquots are there.
684 error = xfs_qm_dqattach(ip, 0);
688 offset_fsb = XFS_B_TO_FSBT(mp, offset);
689 count_fsb = imap->br_blockcount;
690 map_start_fsb = imap->br_startoff;
692 XFS_STATS_ADD(mp, xs_xstrat_bytes, XFS_FSB_TO_B(mp, count_fsb));
694 while (count_fsb != 0) {
696 * Set up a transaction with which to allocate the
697 * backing store for the file. Do allocations in a
698 * loop until we get some space in the range we are
699 * interested in. The other space that might be allocated
700 * is in the delayed allocation extent on which we sit
701 * but before our buffer starts.
705 while (nimaps == 0) {
706 tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE);
707 tp->t_flags |= XFS_TRANS_RESERVE;
708 nres = XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK);
709 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_write,
712 xfs_trans_cancel(tp);
715 xfs_ilock(ip, XFS_ILOCK_EXCL);
716 xfs_trans_ijoin(tp, ip, 0);
718 xfs_bmap_init(&free_list, &first_block);
721 * it is possible that the extents have changed since
722 * we did the read call as we dropped the ilock for a
723 * while. We have to be careful about truncates or hole
724 * punchs here - we are not allowed to allocate
725 * non-delalloc blocks here.
727 * The only protection against truncation is the pages
728 * for the range we are being asked to convert are
729 * locked and hence a truncate will block on them
732 * As a result, if we go beyond the range we really
733 * need and hit an delalloc extent boundary followed by
734 * a hole while we have excess blocks in the map, we
735 * will fill the hole incorrectly and overrun the
736 * transaction reservation.
738 * Using a single map prevents this as we are forced to
739 * check each map we look for overlap with the desired
740 * range and abort as soon as we find it. Also, given
741 * that we only return a single map, having one beyond
742 * what we can return is probably a bit silly.
744 * We also need to check that we don't go beyond EOF;
745 * this is a truncate optimisation as a truncate sets
746 * the new file size before block on the pages we
747 * currently have locked under writeback. Because they
748 * are about to be tossed, we don't need to write them
752 end_fsb = XFS_B_TO_FSB(mp, XFS_ISIZE(ip));
753 error = xfs_bmap_last_offset(ip, &last_block,
758 last_block = XFS_FILEOFF_MAX(last_block, end_fsb);
759 if ((map_start_fsb + count_fsb) > last_block) {
760 count_fsb = last_block - map_start_fsb;
761 if (count_fsb == 0) {
768 * From this point onwards we overwrite the imap
769 * pointer that the caller gave to us.
771 error = xfs_bmapi_write(tp, ip, map_start_fsb,
772 count_fsb, 0, &first_block,
778 error = xfs_bmap_finish(&tp, &free_list, &committed);
782 error = xfs_trans_commit(tp);
786 xfs_iunlock(ip, XFS_ILOCK_EXCL);
790 * See if we were able to allocate an extent that
791 * covers at least part of the callers request
793 if (!(imap->br_startblock || XFS_IS_REALTIME_INODE(ip)))
794 return xfs_alert_fsblock_zero(ip, imap);
796 if ((offset_fsb >= imap->br_startoff) &&
797 (offset_fsb < (imap->br_startoff +
798 imap->br_blockcount))) {
799 XFS_STATS_INC(mp, xs_xstrat_quick);
804 * So far we have not mapped the requested part of the
805 * file, just surrounding data, try again.
807 count_fsb -= imap->br_blockcount;
808 map_start_fsb = imap->br_startoff + imap->br_blockcount;
812 xfs_bmap_cancel(&free_list);
813 xfs_trans_cancel(tp);
815 xfs_iunlock(ip, XFS_ILOCK_EXCL);
820 xfs_iomap_write_unwritten(
825 xfs_mount_t *mp = ip->i_mount;
826 xfs_fileoff_t offset_fsb;
827 xfs_filblks_t count_fsb;
828 xfs_filblks_t numblks_fsb;
829 xfs_fsblock_t firstfsb;
832 xfs_bmbt_irec_t imap;
833 xfs_bmap_free_t free_list;
839 trace_xfs_unwritten_convert(ip, offset, count);
841 offset_fsb = XFS_B_TO_FSBT(mp, offset);
842 count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count);
843 count_fsb = (xfs_filblks_t)(count_fsb - offset_fsb);
846 * Reserve enough blocks in this transaction for two complete extent
847 * btree splits. We may be converting the middle part of an unwritten
848 * extent and in this case we will insert two new extents in the btree
849 * each of which could cause a full split.
851 * This reservation amount will be used in the first call to
852 * xfs_bmbt_split() to select an AG with enough space to satisfy the
853 * rest of the operation.
855 resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0) << 1;
859 * set up a transaction to convert the range of extents
860 * from unwritten to real. Do allocations in a loop until
861 * we have covered the range passed in.
863 * Note that we open code the transaction allocation here
864 * to pass KM_NOFS--we can't risk to recursing back into
865 * the filesystem here as we might be asked to write out
866 * the same inode that we complete here and might deadlock
869 sb_start_intwrite(mp->m_super);
870 tp = _xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE, KM_NOFS);
871 tp->t_flags |= XFS_TRANS_RESERVE | XFS_TRANS_FREEZE_PROT;
872 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_write,
875 xfs_trans_cancel(tp);
879 xfs_ilock(ip, XFS_ILOCK_EXCL);
880 xfs_trans_ijoin(tp, ip, 0);
883 * Modify the unwritten extent state of the buffer.
885 xfs_bmap_init(&free_list, &firstfsb);
887 error = xfs_bmapi_write(tp, ip, offset_fsb, count_fsb,
888 XFS_BMAPI_CONVERT, &firstfsb, resblks,
889 &imap, &nimaps, &free_list);
891 goto error_on_bmapi_transaction;
894 * Log the updated inode size as we go. We have to be careful
895 * to only log it up to the actual write offset if it is
896 * halfway into a block.
898 i_size = XFS_FSB_TO_B(mp, offset_fsb + count_fsb);
899 if (i_size > offset + count)
900 i_size = offset + count;
902 i_size = xfs_new_eof(ip, i_size);
904 ip->i_d.di_size = i_size;
905 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
908 error = xfs_bmap_finish(&tp, &free_list, &committed);
910 goto error_on_bmapi_transaction;
912 error = xfs_trans_commit(tp);
913 xfs_iunlock(ip, XFS_ILOCK_EXCL);
917 if (!(imap.br_startblock || XFS_IS_REALTIME_INODE(ip)))
918 return xfs_alert_fsblock_zero(ip, &imap);
920 if ((numblks_fsb = imap.br_blockcount) == 0) {
922 * The numblks_fsb value should always get
923 * smaller, otherwise the loop is stuck.
925 ASSERT(imap.br_blockcount);
928 offset_fsb += numblks_fsb;
929 count_fsb -= numblks_fsb;
930 } while (count_fsb > 0);
934 error_on_bmapi_transaction:
935 xfs_bmap_cancel(&free_list);
936 xfs_trans_cancel(tp);
937 xfs_iunlock(ip, XFS_ILOCK_EXCL);