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
23 #include "xfs_trans.h"
27 #include "xfs_alloc.h"
28 #include "xfs_dmapi.h"
29 #include "xfs_quota.h"
30 #include "xfs_mount.h"
31 #include "xfs_bmap_btree.h"
32 #include "xfs_alloc_btree.h"
33 #include "xfs_ialloc_btree.h"
34 #include "xfs_dir2_sf.h"
35 #include "xfs_attr_sf.h"
36 #include "xfs_dinode.h"
37 #include "xfs_inode.h"
38 #include "xfs_ialloc.h"
39 #include "xfs_btree.h"
41 #include "xfs_rtalloc.h"
42 #include "xfs_error.h"
43 #include "xfs_itable.h"
47 #include "xfs_buf_item.h"
48 #include "xfs_trans_space.h"
49 #include "xfs_utils.h"
50 #include "xfs_iomap.h"
52 #if defined(XFS_RW_TRACE)
54 xfs_iomap_enter_trace(
60 xfs_inode_t *ip = XFS_IO_INODE(io);
65 ktrace_enter(ip->i_rwtrace,
66 (void *)((unsigned long)tag),
68 (void *)((unsigned long)((ip->i_d.di_size >> 32) & 0xffffffff)),
69 (void *)((unsigned long)(ip->i_d.di_size & 0xffffffff)),
70 (void *)((unsigned long)((offset >> 32) & 0xffffffff)),
71 (void *)((unsigned long)(offset & 0xffffffff)),
72 (void *)((unsigned long)count),
73 (void *)((unsigned long)((io->io_new_size >> 32) & 0xffffffff)),
74 (void *)((unsigned long)(io->io_new_size & 0xffffffff)),
75 (void *)((unsigned long)current_pid()),
91 xfs_bmbt_irec_t *imapp,
94 xfs_inode_t *ip = XFS_IO_INODE(io);
99 ktrace_enter(ip->i_rwtrace,
100 (void *)((unsigned long)tag),
102 (void *)((unsigned long)((ip->i_d.di_size >> 32) & 0xffffffff)),
103 (void *)((unsigned long)(ip->i_d.di_size & 0xffffffff)),
104 (void *)((unsigned long)((offset >> 32) & 0xffffffff)),
105 (void *)((unsigned long)(offset & 0xffffffff)),
106 (void *)((unsigned long)count),
107 (void *)((unsigned long)flags),
108 (void *)((unsigned long)((iomapp->iomap_offset >> 32) & 0xffffffff)),
109 (void *)((unsigned long)(iomapp->iomap_offset & 0xffffffff)),
110 (void *)((unsigned long)(iomapp->iomap_delta)),
111 (void *)((unsigned long)(iomapp->iomap_bsize)),
112 (void *)((unsigned long)(iomapp->iomap_bn)),
113 (void *)(__psint_t)(imapp->br_startoff),
114 (void *)((unsigned long)(imapp->br_blockcount)),
115 (void *)(__psint_t)(imapp->br_startblock));
118 #define xfs_iomap_enter_trace(tag, io, offset, count)
119 #define xfs_iomap_map_trace(tag, io, offset, count, iomapp, imapp, flags)
122 #define XFS_WRITEIO_ALIGN(mp,off) (((off) >> mp->m_writeio_log) \
123 << mp->m_writeio_log)
124 #define XFS_STRAT_WRITE_IMAPS 2
125 #define XFS_WRITE_IMAPS XFS_BMAP_MAX_NMAP
131 xfs_bmbt_irec_t *imap,
133 int imaps, /* Number of imap entries */
134 int iomaps, /* Number of iomap entries */
139 xfs_fsblock_t start_block;
143 for (pbm = 0; imaps && pbm < iomaps; imaps--, iomapp++, imap++, pbm++) {
144 iomapp->iomap_offset = XFS_FSB_TO_B(mp, imap->br_startoff);
145 iomapp->iomap_delta = offset - iomapp->iomap_offset;
146 iomapp->iomap_bsize = XFS_FSB_TO_B(mp, imap->br_blockcount);
147 iomapp->iomap_flags = flags;
149 if (io->io_flags & XFS_IOCORE_RT) {
150 iomapp->iomap_flags |= IOMAP_REALTIME;
151 iomapp->iomap_target = mp->m_rtdev_targp;
153 iomapp->iomap_target = mp->m_ddev_targp;
155 start_block = imap->br_startblock;
156 if (start_block == HOLESTARTBLOCK) {
157 iomapp->iomap_bn = IOMAP_DADDR_NULL;
158 iomapp->iomap_flags |= IOMAP_HOLE;
159 } else if (start_block == DELAYSTARTBLOCK) {
160 iomapp->iomap_bn = IOMAP_DADDR_NULL;
161 iomapp->iomap_flags |= IOMAP_DELAY;
163 iomapp->iomap_bn = XFS_FSB_TO_DB_IO(io, start_block);
164 if (ISUNWRITTEN(imap))
165 iomapp->iomap_flags |= IOMAP_UNWRITTEN;
168 offset += iomapp->iomap_bsize - iomapp->iomap_delta;
170 return pbm; /* Return the number filled */
182 xfs_mount_t *mp = io->io_mount;
183 xfs_fileoff_t offset_fsb, end_fsb;
186 xfs_bmbt_irec_t imap;
191 if (XFS_FORCED_SHUTDOWN(mp))
192 return XFS_ERROR(EIO);
194 switch (flags & (BMAPI_READ | BMAPI_WRITE | BMAPI_ALLOCATE)) {
196 xfs_iomap_enter_trace(XFS_IOMAP_READ_ENTER, io, offset, count);
197 lockmode = XFS_LCK_MAP_SHARED(mp, io);
198 bmapi_flags = XFS_BMAPI_ENTIRE;
201 xfs_iomap_enter_trace(XFS_IOMAP_WRITE_ENTER, io, offset, count);
202 lockmode = XFS_ILOCK_EXCL|XFS_EXTSIZE_WR;
203 if (flags & BMAPI_IGNSTATE)
204 bmapi_flags |= XFS_BMAPI_IGSTATE|XFS_BMAPI_ENTIRE;
205 XFS_ILOCK(mp, io, lockmode);
208 xfs_iomap_enter_trace(XFS_IOMAP_ALLOC_ENTER, io, offset, count);
209 lockmode = XFS_ILOCK_SHARED|XFS_EXTSIZE_RD;
210 bmapi_flags = XFS_BMAPI_ENTIRE;
211 /* Attempt non-blocking lock */
212 if (flags & BMAPI_TRYLOCK) {
213 if (!XFS_ILOCK_NOWAIT(mp, io, lockmode))
214 return XFS_ERROR(EAGAIN);
216 XFS_ILOCK(mp, io, lockmode);
223 ASSERT(offset <= mp->m_maxioffset);
224 if ((xfs_fsize_t)offset + count > mp->m_maxioffset)
225 count = mp->m_maxioffset - offset;
226 end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count);
227 offset_fsb = XFS_B_TO_FSBT(mp, offset);
229 error = XFS_BMAPI(mp, NULL, io, offset_fsb,
230 (xfs_filblks_t)(end_fsb - offset_fsb),
231 bmapi_flags, NULL, 0, &imap,
232 &nimaps, NULL, NULL);
237 switch (flags & (BMAPI_WRITE|BMAPI_ALLOCATE)) {
239 /* If we found an extent, return it */
241 (imap.br_startblock != HOLESTARTBLOCK) &&
242 (imap.br_startblock != DELAYSTARTBLOCK)) {
243 xfs_iomap_map_trace(XFS_IOMAP_WRITE_MAP, io,
244 offset, count, iomapp, &imap, flags);
248 if (flags & (BMAPI_DIRECT|BMAPI_MMAP)) {
249 error = XFS_IOMAP_WRITE_DIRECT(mp, io, offset,
250 count, flags, &imap, &nimaps, nimaps);
252 error = XFS_IOMAP_WRITE_DELAY(mp, io, offset, count,
253 flags, &imap, &nimaps);
256 xfs_iomap_map_trace(XFS_IOMAP_ALLOC_MAP, io,
257 offset, count, iomapp, &imap, flags);
259 iomap_flags = IOMAP_NEW;
262 /* If we found an extent, return it */
263 XFS_IUNLOCK(mp, io, lockmode);
266 if (nimaps && !ISNULLSTARTBLOCK(imap.br_startblock)) {
267 xfs_iomap_map_trace(XFS_IOMAP_WRITE_MAP, io,
268 offset, count, iomapp, &imap, flags);
272 error = XFS_IOMAP_WRITE_ALLOCATE(mp, io, offset, count,
278 *niomaps = xfs_imap_to_bmap(io, offset, &imap,
279 iomapp, nimaps, *niomaps, iomap_flags);
280 } else if (niomaps) {
286 XFS_IUNLOCK(mp, io, lockmode);
287 return XFS_ERROR(error);
291 xfs_iomap_eof_align_last_fsb(
295 xfs_extlen_t extsize,
296 xfs_fileoff_t *last_fsb)
298 xfs_fileoff_t new_last_fsb = 0;
302 if (io->io_flags & XFS_IOCORE_RT)
305 * If mounted with the "-o swalloc" option, roundup the allocation
306 * request to a stripe width boundary if the file size is >=
307 * stripe width and we are allocating past the allocation eof.
309 else if (mp->m_swidth && (mp->m_flags & XFS_MOUNT_SWALLOC) &&
310 (isize >= XFS_FSB_TO_B(mp, mp->m_swidth)))
311 new_last_fsb = roundup_64(*last_fsb, mp->m_swidth);
313 * Roundup the allocation request to a stripe unit (m_dalign) boundary
314 * if the file size is >= stripe unit size, and we are allocating past
315 * the allocation eof.
317 else if (mp->m_dalign && (isize >= XFS_FSB_TO_B(mp, mp->m_dalign)))
318 new_last_fsb = roundup_64(*last_fsb, mp->m_dalign);
321 * Always round up the allocation request to an extent boundary
322 * (when file on a real-time subvolume or has di_extsize hint).
326 align = roundup_64(new_last_fsb, extsize);
329 new_last_fsb = roundup_64(*last_fsb, align);
333 error = XFS_BMAP_EOF(mp, io, new_last_fsb, XFS_DATA_FORK, &eof);
337 *last_fsb = new_last_fsb;
350 if (ip->i_delayed_blks) {
351 xfs_iunlock(ip, XFS_ILOCK_EXCL);
353 xfs_ilock(ip, XFS_ILOCK_EXCL);
356 *ioflags |= BMAPI_SYNC;
362 *ioflags |= BMAPI_SYNC;
365 xfs_iunlock(ip, XFS_ILOCK_EXCL);
366 xfs_flush_device(ip);
367 xfs_ilock(ip, XFS_ILOCK_EXCL);
375 xfs_cmn_err_fsblock_zero(
377 xfs_bmbt_irec_t *imap)
379 xfs_cmn_err(XFS_PTAG_FSBLOCK_ZERO, CE_ALERT, ip->i_mount,
380 "Access to block zero in inode %llu "
381 "start_block: %llx start_off: %llx "
382 "blkcnt: %llx extent-state: %x\n",
383 (unsigned long long)ip->i_ino,
384 (unsigned long long)imap->br_startblock,
385 (unsigned long long)imap->br_startoff,
386 (unsigned long long)imap->br_blockcount,
392 xfs_iomap_write_direct(
397 xfs_bmbt_irec_t *ret_imap,
401 xfs_mount_t *mp = ip->i_mount;
402 xfs_iocore_t *io = &ip->i_iocore;
403 xfs_fileoff_t offset_fsb;
404 xfs_fileoff_t last_fsb;
405 xfs_filblks_t count_fsb, resaligned;
406 xfs_fsblock_t firstfsb;
407 xfs_extlen_t extsz, temp;
414 xfs_bmbt_irec_t imap;
415 xfs_bmap_free_t free_list;
416 uint qblocks, resblks, resrtextents;
421 * Make sure that the dquots are there. This doesn't hold
422 * the ilock across a disk read.
424 error = XFS_QM_DQATTACH(ip->i_mount, ip, XFS_QMOPT_ILOCKED);
426 return XFS_ERROR(error);
428 rt = XFS_IS_REALTIME_INODE(ip);
429 extsz = xfs_get_extsz_hint(ip);
432 if (io->io_new_size > isize)
433 isize = io->io_new_size;
435 offset_fsb = XFS_B_TO_FSBT(mp, offset);
436 last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count)));
437 if ((offset + count) > isize) {
438 error = xfs_iomap_eof_align_last_fsb(mp, io, isize, extsz,
443 if (found && (ret_imap->br_startblock == HOLESTARTBLOCK))
444 last_fsb = MIN(last_fsb, (xfs_fileoff_t)
445 ret_imap->br_blockcount +
446 ret_imap->br_startoff);
448 count_fsb = last_fsb - offset_fsb;
449 ASSERT(count_fsb > 0);
451 resaligned = count_fsb;
452 if (unlikely(extsz)) {
453 if ((temp = do_mod(offset_fsb, extsz)))
455 if ((temp = do_mod(resaligned, extsz)))
456 resaligned += extsz - temp;
460 resrtextents = qblocks = resaligned;
461 resrtextents /= mp->m_sb.sb_rextsize;
462 resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
463 quota_flag = XFS_QMOPT_RES_RTBLKS;
466 resblks = qblocks = XFS_DIOSTRAT_SPACE_RES(mp, resaligned);
467 quota_flag = XFS_QMOPT_RES_REGBLKS;
471 * Allocate and setup the transaction
473 xfs_iunlock(ip, XFS_ILOCK_EXCL);
474 tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);
475 error = xfs_trans_reserve(tp, resblks,
476 XFS_WRITE_LOG_RES(mp), resrtextents,
477 XFS_TRANS_PERM_LOG_RES,
478 XFS_WRITE_LOG_COUNT);
480 * Check for running out of space, note: need lock to return
483 xfs_trans_cancel(tp, 0);
484 xfs_ilock(ip, XFS_ILOCK_EXCL);
488 error = XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, tp, ip,
489 qblocks, 0, quota_flag);
493 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
494 xfs_trans_ihold(tp, ip);
496 bmapi_flag = XFS_BMAPI_WRITE;
497 if ((flags & BMAPI_DIRECT) && (offset < ip->i_size || extsz))
498 bmapi_flag |= XFS_BMAPI_PREALLOC;
501 * Issue the xfs_bmapi() call to allocate the blocks
503 XFS_BMAP_INIT(&free_list, &firstfsb);
505 error = XFS_BMAPI(mp, tp, io, offset_fsb, count_fsb, bmapi_flag,
506 &firstfsb, 0, &imap, &nimaps, &free_list, NULL);
511 * Complete the transaction
513 error = xfs_bmap_finish(&tp, &free_list, &committed);
516 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
521 * Copy any maps to caller's array and return any error.
528 if (unlikely(!imap.br_startblock && !(io->io_flags & XFS_IOCORE_RT))) {
529 error = xfs_cmn_err_fsblock_zero(ip, &imap);
537 error0: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */
538 xfs_bmap_cancel(&free_list);
539 XFS_TRANS_UNRESERVE_QUOTA_NBLKS(mp, tp, ip, qblocks, 0, quota_flag);
541 error1: /* Just cancel transaction */
542 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
543 *nmaps = 0; /* nothing set-up here */
546 return XFS_ERROR(error);
550 * If the caller is doing a write at the end of the file,
551 * then extend the allocation out to the file system's write
552 * iosize. We clean up any extra space left over when the
553 * file is closed in xfs_inactive().
555 * For sync writes, we are flushing delayed allocate space to
556 * try to make additional space available for allocation near
557 * the filesystem full boundary - preallocation hurts in that
558 * situation, of course.
561 xfs_iomap_eof_want_preallocate(
568 xfs_bmbt_irec_t *imap,
572 xfs_fileoff_t start_fsb;
573 xfs_filblks_t count_fsb;
574 xfs_fsblock_t firstblock;
578 if ((ioflag & BMAPI_SYNC) || (offset + count) <= isize)
582 * If there are any real blocks past eof, then don't
583 * do any speculative allocation.
585 start_fsb = XFS_B_TO_FSBT(mp, ((xfs_ufsize_t)(offset + count - 1)));
586 count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp));
587 while (count_fsb > 0) {
589 firstblock = NULLFSBLOCK;
590 error = XFS_BMAPI(mp, NULL, io, start_fsb, count_fsb, 0,
591 &firstblock, 0, imap, &imaps, NULL, NULL);
594 for (n = 0; n < imaps; n++) {
595 if ((imap[n].br_startblock != HOLESTARTBLOCK) &&
596 (imap[n].br_startblock != DELAYSTARTBLOCK))
598 start_fsb += imap[n].br_blockcount;
599 count_fsb -= imap[n].br_blockcount;
607 xfs_iomap_write_delay(
612 xfs_bmbt_irec_t *ret_imap,
615 xfs_mount_t *mp = ip->i_mount;
616 xfs_iocore_t *io = &ip->i_iocore;
617 xfs_fileoff_t offset_fsb;
618 xfs_fileoff_t last_fsb;
619 xfs_off_t aligned_offset;
620 xfs_fileoff_t ioalign;
621 xfs_fsblock_t firstblock;
625 xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS];
626 int prealloc, fsynced = 0;
629 ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE) != 0);
632 * Make sure that the dquots are there. This doesn't hold
633 * the ilock across a disk read.
635 error = XFS_QM_DQATTACH(mp, ip, XFS_QMOPT_ILOCKED);
637 return XFS_ERROR(error);
639 extsz = xfs_get_extsz_hint(ip);
640 offset_fsb = XFS_B_TO_FSBT(mp, offset);
644 if (io->io_new_size > isize)
645 isize = io->io_new_size;
647 error = xfs_iomap_eof_want_preallocate(mp, io, isize, offset, count,
648 ioflag, imap, XFS_WRITE_IMAPS, &prealloc);
653 aligned_offset = XFS_WRITEIO_ALIGN(mp, (offset + count - 1));
654 ioalign = XFS_B_TO_FSBT(mp, aligned_offset);
655 last_fsb = ioalign + mp->m_writeio_blocks;
657 last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count)));
660 if (prealloc || extsz) {
661 error = xfs_iomap_eof_align_last_fsb(mp, io, isize, extsz,
667 nimaps = XFS_WRITE_IMAPS;
668 firstblock = NULLFSBLOCK;
669 error = XFS_BMAPI(mp, NULL, io, offset_fsb,
670 (xfs_filblks_t)(last_fsb - offset_fsb),
671 XFS_BMAPI_DELAY | XFS_BMAPI_WRITE |
672 XFS_BMAPI_ENTIRE, &firstblock, 1, imap,
673 &nimaps, NULL, NULL);
674 if (error && (error != ENOSPC))
675 return XFS_ERROR(error);
678 * If bmapi returned us nothing, and if we didn't get back EDQUOT,
679 * then we must have run out of space - flush delalloc, and retry..
682 xfs_iomap_enter_trace(XFS_IOMAP_WRITE_NOSPACE,
684 if (xfs_flush_space(ip, &fsynced, &ioflag))
685 return XFS_ERROR(ENOSPC);
691 if (unlikely(!imap[0].br_startblock && !(io->io_flags & XFS_IOCORE_RT)))
692 return xfs_cmn_err_fsblock_zero(ip, &imap[0]);
701 * Pass in a delayed allocate extent, convert it to real extents;
702 * return to the caller the extent we create which maps on top of
703 * the originating callers request.
705 * Called without a lock on the inode.
708 xfs_iomap_write_allocate(
712 xfs_bmbt_irec_t *map,
715 xfs_mount_t *mp = ip->i_mount;
716 xfs_iocore_t *io = &ip->i_iocore;
717 xfs_fileoff_t offset_fsb, last_block;
718 xfs_fileoff_t end_fsb, map_start_fsb;
719 xfs_fsblock_t first_block;
720 xfs_bmap_free_t free_list;
721 xfs_filblks_t count_fsb;
722 xfs_bmbt_irec_t imap[XFS_STRAT_WRITE_IMAPS];
724 int i, nimaps, committed;
731 * Make sure that the dquots are there.
733 if ((error = XFS_QM_DQATTACH(mp, ip, 0)))
734 return XFS_ERROR(error);
736 offset_fsb = XFS_B_TO_FSBT(mp, offset);
737 count_fsb = map->br_blockcount;
738 map_start_fsb = map->br_startoff;
740 XFS_STATS_ADD(xs_xstrat_bytes, XFS_FSB_TO_B(mp, count_fsb));
742 while (count_fsb != 0) {
744 * Set up a transaction with which to allocate the
745 * backing store for the file. Do allocations in a
746 * loop until we get some space in the range we are
747 * interested in. The other space that might be allocated
748 * is in the delayed allocation extent on which we sit
749 * but before our buffer starts.
753 while (nimaps == 0) {
754 tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE);
755 tp->t_flags |= XFS_TRANS_RESERVE;
756 nres = XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK);
757 error = xfs_trans_reserve(tp, nres,
758 XFS_WRITE_LOG_RES(mp),
759 0, XFS_TRANS_PERM_LOG_RES,
760 XFS_WRITE_LOG_COUNT);
762 xfs_trans_cancel(tp, 0);
763 return XFS_ERROR(error);
765 xfs_ilock(ip, XFS_ILOCK_EXCL);
766 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
767 xfs_trans_ihold(tp, ip);
769 XFS_BMAP_INIT(&free_list, &first_block);
771 nimaps = XFS_STRAT_WRITE_IMAPS;
773 * Ensure we don't go beyond eof - it is possible
774 * the extents changed since we did the read call,
775 * we dropped the ilock in the interim.
778 end_fsb = XFS_B_TO_FSB(mp, ip->i_size);
779 xfs_bmap_last_offset(NULL, ip, &last_block,
781 last_block = XFS_FILEOFF_MAX(last_block, end_fsb);
782 if ((map_start_fsb + count_fsb) > last_block) {
783 count_fsb = last_block - map_start_fsb;
784 if (count_fsb == 0) {
790 /* Go get the actual blocks */
791 error = XFS_BMAPI(mp, tp, io, map_start_fsb, count_fsb,
792 XFS_BMAPI_WRITE, &first_block, 1,
793 imap, &nimaps, &free_list, NULL);
797 error = xfs_bmap_finish(&tp, &free_list, &committed);
801 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
805 xfs_iunlock(ip, XFS_ILOCK_EXCL);
809 * See if we were able to allocate an extent that
810 * covers at least part of the callers request
812 for (i = 0; i < nimaps; i++) {
813 if (unlikely(!imap[i].br_startblock &&
814 !(io->io_flags & XFS_IOCORE_RT)))
815 return xfs_cmn_err_fsblock_zero(ip, &imap[i]);
816 if ((offset_fsb >= imap[i].br_startoff) &&
817 (offset_fsb < (imap[i].br_startoff +
818 imap[i].br_blockcount))) {
821 XFS_STATS_INC(xs_xstrat_quick);
824 count_fsb -= imap[i].br_blockcount;
827 /* So far we have not mapped the requested part of the
828 * file, just surrounding data, try again.
831 map_start_fsb = imap[nimaps].br_startoff +
832 imap[nimaps].br_blockcount;
836 xfs_bmap_cancel(&free_list);
837 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
839 xfs_iunlock(ip, XFS_ILOCK_EXCL);
840 return XFS_ERROR(error);
844 xfs_iomap_write_unwritten(
849 xfs_mount_t *mp = ip->i_mount;
850 xfs_iocore_t *io = &ip->i_iocore;
851 xfs_fileoff_t offset_fsb;
852 xfs_filblks_t count_fsb;
853 xfs_filblks_t numblks_fsb;
854 xfs_fsblock_t firstfsb;
857 xfs_bmbt_irec_t imap;
858 xfs_bmap_free_t free_list;
863 xfs_iomap_enter_trace(XFS_IOMAP_UNWRITTEN,
864 &ip->i_iocore, offset, count);
866 offset_fsb = XFS_B_TO_FSBT(mp, offset);
867 count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count);
868 count_fsb = (xfs_filblks_t)(count_fsb - offset_fsb);
870 resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0) << 1;
874 * set up a transaction to convert the range of extents
875 * from unwritten to real. Do allocations in a loop until
876 * we have covered the range passed in.
878 tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE);
879 tp->t_flags |= XFS_TRANS_RESERVE;
880 error = xfs_trans_reserve(tp, resblks,
881 XFS_WRITE_LOG_RES(mp), 0,
882 XFS_TRANS_PERM_LOG_RES,
883 XFS_WRITE_LOG_COUNT);
885 xfs_trans_cancel(tp, 0);
886 return XFS_ERROR(error);
889 xfs_ilock(ip, XFS_ILOCK_EXCL);
890 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
891 xfs_trans_ihold(tp, ip);
894 * Modify the unwritten extent state of the buffer.
896 XFS_BMAP_INIT(&free_list, &firstfsb);
898 error = XFS_BMAPI(mp, tp, io, offset_fsb, count_fsb,
899 XFS_BMAPI_WRITE|XFS_BMAPI_CONVERT, &firstfsb,
900 1, &imap, &nimaps, &free_list, NULL);
902 goto error_on_bmapi_transaction;
904 error = xfs_bmap_finish(&(tp), &(free_list), &committed);
906 goto error_on_bmapi_transaction;
908 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
909 xfs_iunlock(ip, XFS_ILOCK_EXCL);
911 return XFS_ERROR(error);
913 if (unlikely(!imap.br_startblock &&
914 !(io->io_flags & XFS_IOCORE_RT)))
915 return xfs_cmn_err_fsblock_zero(ip, &imap);
917 if ((numblks_fsb = imap.br_blockcount) == 0) {
919 * The numblks_fsb value should always get
920 * smaller, otherwise the loop is stuck.
922 ASSERT(imap.br_blockcount);
925 offset_fsb += numblks_fsb;
926 count_fsb -= numblks_fsb;
927 } while (count_fsb > 0);
931 error_on_bmapi_transaction:
932 xfs_bmap_cancel(&free_list);
933 xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT));
934 xfs_iunlock(ip, XFS_ILOCK_EXCL);
935 return XFS_ERROR(error);