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
21 #include "xfs_trans.h"
24 #include "xfs_alloc.h"
25 #include "xfs_quota.h"
26 #include "xfs_mount.h"
27 #include "xfs_bmap_btree.h"
28 #include "xfs_alloc_btree.h"
29 #include "xfs_ialloc_btree.h"
30 #include "xfs_dinode.h"
31 #include "xfs_inode.h"
32 #include "xfs_inode_item.h"
33 #include "xfs_btree.h"
35 #include "xfs_rtalloc.h"
36 #include "xfs_error.h"
37 #include "xfs_itable.h"
39 #include "xfs_buf_item.h"
40 #include "xfs_trans_space.h"
41 #include "xfs_utils.h"
42 #include "xfs_iomap.h"
43 #include "xfs_trace.h"
46 #define XFS_WRITEIO_ALIGN(mp,off) (((off) >> mp->m_writeio_log) \
48 #define XFS_WRITE_IMAPS XFS_BMAP_MAX_NMAP
51 xfs_iomap_eof_align_last_fsb(
55 xfs_fileoff_t *last_fsb)
57 xfs_fileoff_t new_last_fsb = 0;
58 xfs_extlen_t align = 0;
61 if (!XFS_IS_REALTIME_INODE(ip)) {
63 * Round up the allocation request to a stripe unit
64 * (m_dalign) boundary if the file size is >= stripe unit
65 * size, and we are allocating past the allocation eof.
67 * If mounted with the "-o swalloc" option the alignment is
68 * increased from the strip unit size to the stripe width.
70 if (mp->m_swidth && (mp->m_flags & XFS_MOUNT_SWALLOC))
72 else if (mp->m_dalign)
75 if (align && XFS_ISIZE(ip) >= XFS_FSB_TO_B(mp, align))
76 new_last_fsb = roundup_64(*last_fsb, align);
80 * Always round up the allocation request to an extent boundary
81 * (when file on a real-time subvolume or has di_extsize hint).
85 align = roundup_64(new_last_fsb, extsize);
88 new_last_fsb = roundup_64(*last_fsb, align);
92 error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof);
96 *last_fsb = new_last_fsb;
102 xfs_alert_fsblock_zero(
104 xfs_bmbt_irec_t *imap)
106 xfs_alert_tag(ip->i_mount, XFS_PTAG_FSBLOCK_ZERO,
107 "Access to block zero in inode %llu "
108 "start_block: %llx start_off: %llx "
109 "blkcnt: %llx extent-state: %x\n",
110 (unsigned long long)ip->i_ino,
111 (unsigned long long)imap->br_startblock,
112 (unsigned long long)imap->br_startoff,
113 (unsigned long long)imap->br_blockcount,
119 xfs_iomap_write_direct(
123 xfs_bmbt_irec_t *imap,
126 xfs_mount_t *mp = ip->i_mount;
127 xfs_fileoff_t offset_fsb;
128 xfs_fileoff_t last_fsb;
129 xfs_filblks_t count_fsb, resaligned;
130 xfs_fsblock_t firstfsb;
131 xfs_extlen_t extsz, temp;
137 xfs_bmap_free_t free_list;
138 uint qblocks, resblks, resrtextents;
142 error = xfs_qm_dqattach(ip, 0);
144 return XFS_ERROR(error);
146 rt = XFS_IS_REALTIME_INODE(ip);
147 extsz = xfs_get_extsz_hint(ip);
149 offset_fsb = XFS_B_TO_FSBT(mp, offset);
150 last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count)));
151 if ((offset + count) > XFS_ISIZE(ip)) {
152 error = xfs_iomap_eof_align_last_fsb(mp, ip, extsz, &last_fsb);
154 return XFS_ERROR(error);
156 if (nmaps && (imap->br_startblock == HOLESTARTBLOCK))
157 last_fsb = MIN(last_fsb, (xfs_fileoff_t)
158 imap->br_blockcount +
161 count_fsb = last_fsb - offset_fsb;
162 ASSERT(count_fsb > 0);
164 resaligned = count_fsb;
165 if (unlikely(extsz)) {
166 if ((temp = do_mod(offset_fsb, extsz)))
168 if ((temp = do_mod(resaligned, extsz)))
169 resaligned += extsz - temp;
173 resrtextents = qblocks = resaligned;
174 resrtextents /= mp->m_sb.sb_rextsize;
175 resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
176 quota_flag = XFS_QMOPT_RES_RTBLKS;
179 resblks = qblocks = XFS_DIOSTRAT_SPACE_RES(mp, resaligned);
180 quota_flag = XFS_QMOPT_RES_REGBLKS;
184 * Allocate and setup the transaction
186 tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);
187 error = xfs_trans_reserve(tp, resblks,
188 XFS_WRITE_LOG_RES(mp), resrtextents,
189 XFS_TRANS_PERM_LOG_RES,
190 XFS_WRITE_LOG_COUNT);
192 * Check for running out of space, note: need lock to return
195 xfs_trans_cancel(tp, 0);
196 return XFS_ERROR(error);
199 xfs_ilock(ip, XFS_ILOCK_EXCL);
201 error = xfs_trans_reserve_quota_nblks(tp, ip, qblocks, 0, quota_flag);
203 goto out_trans_cancel;
205 xfs_trans_ijoin(tp, ip, 0);
208 if (offset < XFS_ISIZE(ip) || extsz)
209 bmapi_flag |= XFS_BMAPI_PREALLOC;
212 * From this point onwards we overwrite the imap pointer that the
215 xfs_bmap_init(&free_list, &firstfsb);
217 error = xfs_bmapi_write(tp, ip, offset_fsb, count_fsb, bmapi_flag,
218 &firstfsb, 0, imap, &nimaps, &free_list);
220 goto out_bmap_cancel;
223 * Complete the transaction
225 error = xfs_bmap_finish(&tp, &free_list, &committed);
227 goto out_bmap_cancel;
228 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
233 * Copy any maps to caller's array and return any error.
236 error = XFS_ERROR(ENOSPC);
240 if (!(imap->br_startblock || XFS_IS_REALTIME_INODE(ip)))
241 error = xfs_alert_fsblock_zero(ip, imap);
244 xfs_iunlock(ip, XFS_ILOCK_EXCL);
248 xfs_bmap_cancel(&free_list);
249 xfs_trans_unreserve_quota_nblks(tp, ip, (long)qblocks, 0, quota_flag);
251 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
256 * If the caller is doing a write at the end of the file, then extend the
257 * allocation out to the file system's write iosize. We clean up any extra
258 * space left over when the file is closed in xfs_inactive().
260 * If we find we already have delalloc preallocation beyond EOF, don't do more
261 * preallocation as it it not needed.
264 xfs_iomap_eof_want_preallocate(
269 xfs_bmbt_irec_t *imap,
273 xfs_fileoff_t start_fsb;
274 xfs_filblks_t count_fsb;
275 xfs_fsblock_t firstblock;
277 int found_delalloc = 0;
280 if (offset + count <= XFS_ISIZE(ip))
284 * If there are any real blocks past eof, then don't
285 * do any speculative allocation.
287 start_fsb = XFS_B_TO_FSBT(mp, ((xfs_ufsize_t)(offset + count - 1)));
288 count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp));
289 while (count_fsb > 0) {
291 firstblock = NULLFSBLOCK;
292 error = xfs_bmapi_read(ip, start_fsb, count_fsb, imap, &imaps,
296 for (n = 0; n < imaps; n++) {
297 if ((imap[n].br_startblock != HOLESTARTBLOCK) &&
298 (imap[n].br_startblock != DELAYSTARTBLOCK))
300 start_fsb += imap[n].br_blockcount;
301 count_fsb -= imap[n].br_blockcount;
303 if (imap[n].br_startblock == DELAYSTARTBLOCK)
313 * If we don't have a user specified preallocation size, dynamically increase
314 * the preallocation size as the size of the file grows. Cap the maximum size
315 * at a single extent or less if the filesystem is near full. The closer the
316 * filesystem is to full, the smaller the maximum prealocation.
319 xfs_iomap_prealloc_size(
320 struct xfs_mount *mp,
321 struct xfs_inode *ip)
323 xfs_fsblock_t alloc_blocks = 0;
325 if (!(mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)) {
330 * rounddown_pow_of_two() returns an undefined result
331 * if we pass in alloc_blocks = 0. Hence the "+ 1" to
332 * ensure we always pass in a non-zero value.
334 alloc_blocks = XFS_B_TO_FSB(mp, XFS_ISIZE(ip)) + 1;
335 alloc_blocks = XFS_FILEOFF_MIN(MAXEXTLEN,
336 rounddown_pow_of_two(alloc_blocks));
338 xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT);
339 freesp = mp->m_sb.sb_fdblocks;
340 if (freesp < mp->m_low_space[XFS_LOWSP_5_PCNT]) {
342 if (freesp < mp->m_low_space[XFS_LOWSP_4_PCNT])
344 if (freesp < mp->m_low_space[XFS_LOWSP_3_PCNT])
346 if (freesp < mp->m_low_space[XFS_LOWSP_2_PCNT])
348 if (freesp < mp->m_low_space[XFS_LOWSP_1_PCNT])
352 alloc_blocks >>= shift;
355 if (alloc_blocks < mp->m_writeio_blocks)
356 alloc_blocks = mp->m_writeio_blocks;
362 xfs_iomap_write_delay(
366 xfs_bmbt_irec_t *ret_imap)
368 xfs_mount_t *mp = ip->i_mount;
369 xfs_fileoff_t offset_fsb;
370 xfs_fileoff_t last_fsb;
371 xfs_off_t aligned_offset;
372 xfs_fileoff_t ioalign;
375 xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS];
376 int prealloc, flushed = 0;
379 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
382 * Make sure that the dquots are there. This doesn't hold
383 * the ilock across a disk read.
385 error = xfs_qm_dqattach_locked(ip, 0);
387 return XFS_ERROR(error);
389 extsz = xfs_get_extsz_hint(ip);
390 offset_fsb = XFS_B_TO_FSBT(mp, offset);
393 error = xfs_iomap_eof_want_preallocate(mp, ip, offset, count,
394 imap, XFS_WRITE_IMAPS, &prealloc);
400 xfs_fsblock_t alloc_blocks = xfs_iomap_prealloc_size(mp, ip);
402 aligned_offset = XFS_WRITEIO_ALIGN(mp, (offset + count - 1));
403 ioalign = XFS_B_TO_FSBT(mp, aligned_offset);
404 last_fsb = ioalign + alloc_blocks;
406 last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count)));
409 if (prealloc || extsz) {
410 error = xfs_iomap_eof_align_last_fsb(mp, ip, extsz, &last_fsb);
416 * Make sure preallocation does not create extents beyond the range we
417 * actually support in this filesystem.
419 if (last_fsb > XFS_B_TO_FSB(mp, mp->m_maxioffset))
420 last_fsb = XFS_B_TO_FSB(mp, mp->m_maxioffset);
422 ASSERT(last_fsb > offset_fsb);
424 nimaps = XFS_WRITE_IMAPS;
425 error = xfs_bmapi_delay(ip, offset_fsb, last_fsb - offset_fsb,
426 imap, &nimaps, XFS_BMAPI_ENTIRE);
433 return XFS_ERROR(error);
437 * If bmapi returned us nothing, we got either ENOSPC or EDQUOT. For
438 * ENOSPC, * flush all other inodes with delalloc blocks to free up
439 * some of the excess reserved metadata space. For both cases, retry
440 * without EOF preallocation.
443 trace_xfs_delalloc_enospc(ip, offset, count);
445 return XFS_ERROR(error ? error : ENOSPC);
447 if (error == ENOSPC) {
448 xfs_iunlock(ip, XFS_ILOCK_EXCL);
449 xfs_flush_inodes(ip);
450 xfs_ilock(ip, XFS_ILOCK_EXCL);
459 if (!(imap[0].br_startblock || XFS_IS_REALTIME_INODE(ip)))
460 return xfs_alert_fsblock_zero(ip, &imap[0]);
467 * Pass in a delayed allocate extent, convert it to real extents;
468 * return to the caller the extent we create which maps on top of
469 * the originating callers request.
471 * Called without a lock on the inode.
473 * We no longer bother to look at the incoming map - all we have to
474 * guarantee is that whatever we allocate fills the required range.
477 xfs_iomap_write_allocate(
481 xfs_bmbt_irec_t *imap)
483 xfs_mount_t *mp = ip->i_mount;
484 xfs_fileoff_t offset_fsb, last_block;
485 xfs_fileoff_t end_fsb, map_start_fsb;
486 xfs_fsblock_t first_block;
487 xfs_bmap_free_t free_list;
488 xfs_filblks_t count_fsb;
490 int nimaps, committed;
495 * Make sure that the dquots are there.
497 error = xfs_qm_dqattach(ip, 0);
499 return XFS_ERROR(error);
501 offset_fsb = XFS_B_TO_FSBT(mp, offset);
502 count_fsb = imap->br_blockcount;
503 map_start_fsb = imap->br_startoff;
505 XFS_STATS_ADD(xs_xstrat_bytes, XFS_FSB_TO_B(mp, count_fsb));
507 while (count_fsb != 0) {
509 * Set up a transaction with which to allocate the
510 * backing store for the file. Do allocations in a
511 * loop until we get some space in the range we are
512 * interested in. The other space that might be allocated
513 * is in the delayed allocation extent on which we sit
514 * but before our buffer starts.
518 while (nimaps == 0) {
519 tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE);
520 tp->t_flags |= XFS_TRANS_RESERVE;
521 nres = XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK);
522 error = xfs_trans_reserve(tp, nres,
523 XFS_WRITE_LOG_RES(mp),
524 0, XFS_TRANS_PERM_LOG_RES,
525 XFS_WRITE_LOG_COUNT);
527 xfs_trans_cancel(tp, 0);
528 return XFS_ERROR(error);
530 xfs_ilock(ip, XFS_ILOCK_EXCL);
531 xfs_trans_ijoin(tp, ip, 0);
533 xfs_bmap_init(&free_list, &first_block);
536 * it is possible that the extents have changed since
537 * we did the read call as we dropped the ilock for a
538 * while. We have to be careful about truncates or hole
539 * punchs here - we are not allowed to allocate
540 * non-delalloc blocks here.
542 * The only protection against truncation is the pages
543 * for the range we are being asked to convert are
544 * locked and hence a truncate will block on them
547 * As a result, if we go beyond the range we really
548 * need and hit an delalloc extent boundary followed by
549 * a hole while we have excess blocks in the map, we
550 * will fill the hole incorrectly and overrun the
551 * transaction reservation.
553 * Using a single map prevents this as we are forced to
554 * check each map we look for overlap with the desired
555 * range and abort as soon as we find it. Also, given
556 * that we only return a single map, having one beyond
557 * what we can return is probably a bit silly.
559 * We also need to check that we don't go beyond EOF;
560 * this is a truncate optimisation as a truncate sets
561 * the new file size before block on the pages we
562 * currently have locked under writeback. Because they
563 * are about to be tossed, we don't need to write them
567 end_fsb = XFS_B_TO_FSB(mp, XFS_ISIZE(ip));
568 error = xfs_bmap_last_offset(NULL, ip, &last_block,
573 last_block = XFS_FILEOFF_MAX(last_block, end_fsb);
574 if ((map_start_fsb + count_fsb) > last_block) {
575 count_fsb = last_block - map_start_fsb;
576 if (count_fsb == 0) {
583 * From this point onwards we overwrite the imap
584 * pointer that the caller gave to us.
586 error = xfs_bmapi_write(tp, ip, map_start_fsb,
587 count_fsb, 0, &first_block, 1,
588 imap, &nimaps, &free_list);
592 error = xfs_bmap_finish(&tp, &free_list, &committed);
596 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
600 xfs_iunlock(ip, XFS_ILOCK_EXCL);
604 * See if we were able to allocate an extent that
605 * covers at least part of the callers request
607 if (!(imap->br_startblock || XFS_IS_REALTIME_INODE(ip)))
608 return xfs_alert_fsblock_zero(ip, imap);
610 if ((offset_fsb >= imap->br_startoff) &&
611 (offset_fsb < (imap->br_startoff +
612 imap->br_blockcount))) {
613 XFS_STATS_INC(xs_xstrat_quick);
618 * So far we have not mapped the requested part of the
619 * file, just surrounding data, try again.
621 count_fsb -= imap->br_blockcount;
622 map_start_fsb = imap->br_startoff + imap->br_blockcount;
626 xfs_bmap_cancel(&free_list);
627 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
629 xfs_iunlock(ip, XFS_ILOCK_EXCL);
630 return XFS_ERROR(error);
634 xfs_iomap_write_unwritten(
639 xfs_mount_t *mp = ip->i_mount;
640 xfs_fileoff_t offset_fsb;
641 xfs_filblks_t count_fsb;
642 xfs_filblks_t numblks_fsb;
643 xfs_fsblock_t firstfsb;
646 xfs_bmbt_irec_t imap;
647 xfs_bmap_free_t free_list;
653 trace_xfs_unwritten_convert(ip, offset, count);
655 offset_fsb = XFS_B_TO_FSBT(mp, offset);
656 count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count);
657 count_fsb = (xfs_filblks_t)(count_fsb - offset_fsb);
660 * Reserve enough blocks in this transaction for two complete extent
661 * btree splits. We may be converting the middle part of an unwritten
662 * extent and in this case we will insert two new extents in the btree
663 * each of which could cause a full split.
665 * This reservation amount will be used in the first call to
666 * xfs_bmbt_split() to select an AG with enough space to satisfy the
667 * rest of the operation.
669 resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0) << 1;
673 * set up a transaction to convert the range of extents
674 * from unwritten to real. Do allocations in a loop until
675 * we have covered the range passed in.
677 * Note that we open code the transaction allocation here
678 * to pass KM_NOFS--we can't risk to recursing back into
679 * the filesystem here as we might be asked to write out
680 * the same inode that we complete here and might deadlock
683 xfs_wait_for_freeze(mp, SB_FREEZE_TRANS);
684 tp = _xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE, KM_NOFS);
685 tp->t_flags |= XFS_TRANS_RESERVE;
686 error = xfs_trans_reserve(tp, resblks,
687 XFS_WRITE_LOG_RES(mp), 0,
688 XFS_TRANS_PERM_LOG_RES,
689 XFS_WRITE_LOG_COUNT);
691 xfs_trans_cancel(tp, 0);
692 return XFS_ERROR(error);
695 xfs_ilock(ip, XFS_ILOCK_EXCL);
696 xfs_trans_ijoin(tp, ip, 0);
699 * Modify the unwritten extent state of the buffer.
701 xfs_bmap_init(&free_list, &firstfsb);
703 error = xfs_bmapi_write(tp, ip, offset_fsb, count_fsb,
704 XFS_BMAPI_CONVERT, &firstfsb,
705 1, &imap, &nimaps, &free_list);
707 goto error_on_bmapi_transaction;
710 * Log the updated inode size as we go. We have to be careful
711 * to only log it up to the actual write offset if it is
712 * halfway into a block.
714 i_size = XFS_FSB_TO_B(mp, offset_fsb + count_fsb);
715 if (i_size > offset + count)
716 i_size = offset + count;
718 i_size = xfs_new_eof(ip, i_size);
720 ip->i_d.di_size = i_size;
721 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
724 error = xfs_bmap_finish(&tp, &free_list, &committed);
726 goto error_on_bmapi_transaction;
728 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
729 xfs_iunlock(ip, XFS_ILOCK_EXCL);
731 return XFS_ERROR(error);
733 if (!(imap.br_startblock || XFS_IS_REALTIME_INODE(ip)))
734 return xfs_alert_fsblock_zero(ip, &imap);
736 if ((numblks_fsb = imap.br_blockcount) == 0) {
738 * The numblks_fsb value should always get
739 * smaller, otherwise the loop is stuck.
741 ASSERT(imap.br_blockcount);
744 offset_fsb += numblks_fsb;
745 count_fsb -= numblks_fsb;
746 } while (count_fsb > 0);
750 error_on_bmapi_transaction:
751 xfs_bmap_cancel(&free_list);
752 xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT));
753 xfs_iunlock(ip, XFS_ILOCK_EXCL);
754 return XFS_ERROR(error);