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_types.h"
25 #include "xfs_trans.h"
29 #include "xfs_mount.h"
30 #include "xfs_da_btree.h"
31 #include "xfs_bmap_btree.h"
32 #include "xfs_ialloc_btree.h"
33 #include "xfs_dinode.h"
34 #include "xfs_inode.h"
35 #include "xfs_inode_item.h"
36 #include "xfs_itable.h"
37 #include "xfs_ialloc.h"
38 #include "xfs_alloc.h"
43 #include "xfs_error.h"
44 #include "xfs_quota.h"
45 #include "xfs_utils.h"
46 #include "xfs_rtalloc.h"
47 #include "xfs_trans_space.h"
48 #include "xfs_log_priv.h"
49 #include "xfs_filestream.h"
50 #include "xfs_vnodeops.h"
51 #include "xfs_trace.h"
54 * The maximum pathlen is 1024 bytes. Since the minimum file system
55 * blocksize is 512 bytes, we can get a max of 2 extents back from
58 #define SYMLINK_MAPS 2
65 xfs_mount_t
*mp
= ip
->i_mount
;
66 int pathlen
= ip
->i_d
.di_size
;
67 int nmaps
= SYMLINK_MAPS
;
68 xfs_bmbt_irec_t mval
[SYMLINK_MAPS
];
75 error
= xfs_bmapi_read(ip
, 0, XFS_B_TO_FSB(mp
, pathlen
), mval
, &nmaps
,
80 for (n
= 0; n
< nmaps
; n
++) {
81 d
= XFS_FSB_TO_DADDR(mp
, mval
[n
].br_startblock
);
82 byte_cnt
= XFS_FSB_TO_B(mp
, mval
[n
].br_blockcount
);
84 bp
= xfs_buf_read(mp
->m_ddev_targp
, d
, BTOBB(byte_cnt
),
85 XBF_LOCK
| XBF_MAPPED
| XBF_DONT_BLOCK
);
87 return XFS_ERROR(ENOMEM
);
90 xfs_buf_ioerror_alert(bp
, __func__
);
94 if (pathlen
< byte_cnt
)
98 memcpy(link
, bp
->b_addr
, byte_cnt
);
102 link
[ip
->i_d
.di_size
] = '\0';
114 xfs_mount_t
*mp
= ip
->i_mount
;
118 trace_xfs_readlink(ip
);
120 if (XFS_FORCED_SHUTDOWN(mp
))
121 return XFS_ERROR(EIO
);
123 xfs_ilock(ip
, XFS_ILOCK_SHARED
);
125 pathlen
= ip
->i_d
.di_size
;
129 if (pathlen
< 0 || pathlen
> MAXPATHLEN
) {
130 xfs_alert(mp
, "%s: inode (%llu) bad symlink length (%lld)",
131 __func__
, (unsigned long long) ip
->i_ino
,
132 (long long) pathlen
);
134 error
= XFS_ERROR(EFSCORRUPTED
);
139 if (ip
->i_df
.if_flags
& XFS_IFINLINE
) {
140 memcpy(link
, ip
->i_df
.if_u1
.if_data
, pathlen
);
141 link
[pathlen
] = '\0';
143 error
= xfs_readlink_bmap(ip
, link
);
147 xfs_iunlock(ip
, XFS_ILOCK_SHARED
);
152 * Flags for xfs_free_eofblocks
154 #define XFS_FREE_EOF_TRYLOCK (1<<0)
157 * This is called by xfs_inactive to free any blocks beyond eof
158 * when the link count isn't zero and by xfs_dm_punch_hole() when
159 * punching a hole to EOF.
169 xfs_fileoff_t end_fsb
;
170 xfs_fileoff_t last_fsb
;
171 xfs_filblks_t map_len
;
173 xfs_bmbt_irec_t imap
;
176 * Figure out if there are any blocks beyond the end
177 * of the file. If not, then there is nothing to do.
179 end_fsb
= XFS_B_TO_FSB(mp
, (xfs_ufsize_t
)XFS_ISIZE(ip
));
180 last_fsb
= XFS_B_TO_FSB(mp
, (xfs_ufsize_t
)XFS_MAXIOFFSET(mp
));
181 if (last_fsb
<= end_fsb
)
183 map_len
= last_fsb
- end_fsb
;
186 xfs_ilock(ip
, XFS_ILOCK_SHARED
);
187 error
= xfs_bmapi_read(ip
, end_fsb
, map_len
, &imap
, &nimaps
, 0);
188 xfs_iunlock(ip
, XFS_ILOCK_SHARED
);
190 if (!error
&& (nimaps
!= 0) &&
191 (imap
.br_startblock
!= HOLESTARTBLOCK
||
192 ip
->i_delayed_blks
)) {
194 * Attach the dquots to the inode up front.
196 error
= xfs_qm_dqattach(ip
, 0);
201 * There are blocks after the end of file.
202 * Free them up now by truncating the file to
205 tp
= xfs_trans_alloc(mp
, XFS_TRANS_INACTIVE
);
207 if (flags
& XFS_FREE_EOF_TRYLOCK
) {
208 if (!xfs_ilock_nowait(ip
, XFS_IOLOCK_EXCL
)) {
209 xfs_trans_cancel(tp
, 0);
213 xfs_ilock(ip
, XFS_IOLOCK_EXCL
);
216 error
= xfs_trans_reserve(tp
, 0,
217 XFS_ITRUNCATE_LOG_RES(mp
),
218 0, XFS_TRANS_PERM_LOG_RES
,
219 XFS_ITRUNCATE_LOG_COUNT
);
221 ASSERT(XFS_FORCED_SHUTDOWN(mp
));
222 xfs_trans_cancel(tp
, 0);
223 xfs_iunlock(ip
, XFS_IOLOCK_EXCL
);
227 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
228 xfs_trans_ijoin(tp
, ip
, 0);
231 * Do not update the on-disk file size. If we update the
232 * on-disk file size and then the system crashes before the
233 * contents of the file are flushed to disk then the files
234 * may be full of holes (ie NULL files bug).
236 error
= xfs_itruncate_extents(&tp
, ip
, XFS_DATA_FORK
,
240 * If we get an error at this point we simply don't
241 * bother truncating the file.
244 (XFS_TRANS_RELEASE_LOG_RES
|
247 error
= xfs_trans_commit(tp
,
248 XFS_TRANS_RELEASE_LOG_RES
);
250 xfs_iunlock(ip
, XFS_IOLOCK_EXCL
|XFS_ILOCK_EXCL
);
256 * Free a symlink that has blocks associated with it.
259 xfs_inactive_symlink_rmt(
267 xfs_fsblock_t first_block
;
268 xfs_bmap_free_t free_list
;
271 xfs_bmbt_irec_t mval
[SYMLINK_MAPS
];
279 ASSERT(ip
->i_d
.di_size
> XFS_IFORK_DSIZE(ip
));
281 * We're freeing a symlink that has some
282 * blocks allocated to it. Free the
283 * blocks here. We know that we've got
284 * either 1 or 2 extents and that we can
285 * free them all in one bunmapi call.
287 ASSERT(ip
->i_d
.di_nextents
> 0 && ip
->i_d
.di_nextents
<= 2);
288 if ((error
= xfs_trans_reserve(tp
, 0, XFS_ITRUNCATE_LOG_RES(mp
), 0,
289 XFS_TRANS_PERM_LOG_RES
, XFS_ITRUNCATE_LOG_COUNT
))) {
290 ASSERT(XFS_FORCED_SHUTDOWN(mp
));
291 xfs_trans_cancel(tp
, 0);
296 * Lock the inode, fix the size, and join it to the transaction.
297 * Hold it so in the normal path, we still have it locked for
298 * the second transaction. In the error paths we need it
299 * held so the cancel won't rele it, see below.
301 xfs_ilock(ip
, XFS_IOLOCK_EXCL
| XFS_ILOCK_EXCL
);
302 size
= (int)ip
->i_d
.di_size
;
304 xfs_trans_ijoin(tp
, ip
, 0);
305 xfs_trans_log_inode(tp
, ip
, XFS_ILOG_CORE
);
307 * Find the block(s) so we can inval and unmap them.
310 xfs_bmap_init(&free_list
, &first_block
);
311 nmaps
= ARRAY_SIZE(mval
);
312 error
= xfs_bmapi_read(ip
, 0, XFS_B_TO_FSB(mp
, size
),
317 * Invalidate the block(s).
319 for (i
= 0; i
< nmaps
; i
++) {
320 bp
= xfs_trans_get_buf(tp
, mp
->m_ddev_targp
,
321 XFS_FSB_TO_DADDR(mp
, mval
[i
].br_startblock
),
322 XFS_FSB_TO_BB(mp
, mval
[i
].br_blockcount
), 0);
327 xfs_trans_binval(tp
, bp
);
330 * Unmap the dead block(s) to the free_list.
332 if ((error
= xfs_bunmapi(tp
, ip
, 0, size
, XFS_BMAPI_METADATA
, nmaps
,
333 &first_block
, &free_list
, &done
)))
337 * Commit the first transaction. This logs the EFI and the inode.
339 if ((error
= xfs_bmap_finish(&tp
, &free_list
, &committed
)))
342 * The transaction must have been committed, since there were
343 * actually extents freed by xfs_bunmapi. See xfs_bmap_finish.
344 * The new tp has the extent freeing and EFDs.
348 * The first xact was committed, so add the inode to the new one.
349 * Mark it dirty so it will be logged and moved forward in the log as
350 * part of every commit.
352 xfs_trans_ijoin(tp
, ip
, 0);
353 xfs_trans_log_inode(tp
, ip
, XFS_ILOG_CORE
);
355 * Get a new, empty transaction to return to our caller.
357 ntp
= xfs_trans_dup(tp
);
359 * Commit the transaction containing extent freeing and EFDs.
360 * If we get an error on the commit here or on the reserve below,
361 * we need to unlock the inode since the new transaction doesn't
362 * have the inode attached.
364 error
= xfs_trans_commit(tp
, 0);
367 ASSERT(XFS_FORCED_SHUTDOWN(mp
));
371 * transaction commit worked ok so we can drop the extra ticket
372 * reference that we gained in xfs_trans_dup()
374 xfs_log_ticket_put(tp
->t_ticket
);
377 * Remove the memory for extent descriptions (just bookkeeping).
379 if (ip
->i_df
.if_bytes
)
380 xfs_idata_realloc(ip
, -ip
->i_df
.if_bytes
, XFS_DATA_FORK
);
381 ASSERT(ip
->i_df
.if_bytes
== 0);
383 * Put an itruncate log reservation in the new transaction
386 if ((error
= xfs_trans_reserve(tp
, 0, XFS_ITRUNCATE_LOG_RES(mp
), 0,
387 XFS_TRANS_PERM_LOG_RES
, XFS_ITRUNCATE_LOG_COUNT
))) {
388 ASSERT(XFS_FORCED_SHUTDOWN(mp
));
392 * Return with the inode locked but not joined to the transaction.
398 xfs_bmap_cancel(&free_list
);
401 * Have to come here with the inode locked and either
402 * (held and in the transaction) or (not in the transaction).
403 * If the inode isn't held then cancel would iput it, but
404 * that's wrong since this is inactive and the vnode ref
405 * count is 0 already.
406 * Cancel won't do anything to the inode if held, but it still
407 * needs to be locked until the cancel is done, if it was
408 * joined to the transaction.
410 xfs_trans_cancel(tp
, XFS_TRANS_RELEASE_LOG_RES
| XFS_TRANS_ABORT
);
411 xfs_iunlock(ip
, XFS_IOLOCK_EXCL
| XFS_ILOCK_EXCL
);
418 xfs_inactive_symlink_local(
424 ASSERT(ip
->i_d
.di_size
<= XFS_IFORK_DSIZE(ip
));
426 * We're freeing a symlink which fit into
427 * the inode. Just free the memory used
428 * to hold the old symlink.
430 error
= xfs_trans_reserve(*tpp
, 0,
431 XFS_ITRUNCATE_LOG_RES(ip
->i_mount
),
432 0, XFS_TRANS_PERM_LOG_RES
,
433 XFS_ITRUNCATE_LOG_COUNT
);
436 xfs_trans_cancel(*tpp
, 0);
440 xfs_ilock(ip
, XFS_ILOCK_EXCL
| XFS_IOLOCK_EXCL
);
443 * Zero length symlinks _can_ exist.
445 if (ip
->i_df
.if_bytes
> 0) {
446 xfs_idata_realloc(ip
,
447 -(ip
->i_df
.if_bytes
),
449 ASSERT(ip
->i_df
.if_bytes
== 0);
463 ASSERT(xfs_isilocked(ip
, XFS_IOLOCK_EXCL
));
466 ASSERT(ip
->i_d
.di_forkoff
!= 0);
467 error
= xfs_trans_commit(tp
, XFS_TRANS_RELEASE_LOG_RES
);
468 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
472 error
= xfs_attr_inactive(ip
);
476 tp
= xfs_trans_alloc(mp
, XFS_TRANS_INACTIVE
);
477 error
= xfs_trans_reserve(tp
, 0,
478 XFS_IFREE_LOG_RES(mp
),
479 0, XFS_TRANS_PERM_LOG_RES
,
480 XFS_INACTIVE_LOG_COUNT
);
484 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
485 xfs_trans_ijoin(tp
, ip
, 0);
486 xfs_idestroy_fork(ip
, XFS_ATTR_FORK
);
488 ASSERT(ip
->i_d
.di_anextents
== 0);
494 ASSERT(XFS_FORCED_SHUTDOWN(mp
));
495 xfs_trans_cancel(tp
, 0);
498 xfs_iunlock(ip
, XFS_IOLOCK_EXCL
);
506 xfs_mount_t
*mp
= ip
->i_mount
;
509 if (!S_ISREG(ip
->i_d
.di_mode
) || (ip
->i_d
.di_mode
== 0))
512 /* If this is a read-only mount, don't do this (would generate I/O) */
513 if (mp
->m_flags
& XFS_MOUNT_RDONLY
)
516 if (!XFS_FORCED_SHUTDOWN(mp
)) {
520 * If we are using filestreams, and we have an unlinked
521 * file that we are processing the last close on, then nothing
522 * will be able to reopen and write to this file. Purge this
523 * inode from the filestreams cache so that it doesn't delay
524 * teardown of the inode.
526 if ((ip
->i_d
.di_nlink
== 0) && xfs_inode_is_filestream(ip
))
527 xfs_filestream_deassociate(ip
);
530 * If we previously truncated this file and removed old data
531 * in the process, we want to initiate "early" writeout on
532 * the last close. This is an attempt to combat the notorious
533 * NULL files problem which is particularly noticeable from a
534 * truncate down, buffered (re-)write (delalloc), followed by
535 * a crash. What we are effectively doing here is
536 * significantly reducing the time window where we'd otherwise
537 * be exposed to that problem.
539 truncated
= xfs_iflags_test_and_clear(ip
, XFS_ITRUNCATED
);
541 xfs_iflags_clear(ip
, XFS_IDIRTY_RELEASE
);
542 if (VN_DIRTY(VFS_I(ip
)) && ip
->i_delayed_blks
> 0)
543 xfs_flush_pages(ip
, 0, -1, XBF_ASYNC
, FI_NONE
);
547 if (ip
->i_d
.di_nlink
== 0)
550 if ((S_ISREG(ip
->i_d
.di_mode
) &&
551 (VFS_I(ip
)->i_size
> 0 ||
552 (VN_CACHED(VFS_I(ip
)) > 0 || ip
->i_delayed_blks
> 0)) &&
553 (ip
->i_df
.if_flags
& XFS_IFEXTENTS
)) &&
554 (!(ip
->i_d
.di_flags
& (XFS_DIFLAG_PREALLOC
| XFS_DIFLAG_APPEND
)))) {
557 * If we can't get the iolock just skip truncating the blocks
558 * past EOF because we could deadlock with the mmap_sem
559 * otherwise. We'll get another chance to drop them once the
560 * last reference to the inode is dropped, so we'll never leak
561 * blocks permanently.
563 * Further, check if the inode is being opened, written and
564 * closed frequently and we have delayed allocation blocks
565 * outstanding (e.g. streaming writes from the NFS server),
566 * truncating the blocks past EOF will cause fragmentation to
569 * In this case don't do the truncation, either, but we have to
570 * be careful how we detect this case. Blocks beyond EOF show
571 * up as i_delayed_blks even when the inode is clean, so we
572 * need to truncate them away first before checking for a dirty
573 * release. Hence on the first dirty close we will still remove
574 * the speculative allocation, but after that we will leave it
577 if (xfs_iflags_test(ip
, XFS_IDIRTY_RELEASE
))
580 error
= xfs_free_eofblocks(mp
, ip
,
581 XFS_FREE_EOF_TRYLOCK
);
585 /* delalloc blocks after truncation means it really is dirty */
586 if (ip
->i_delayed_blks
)
587 xfs_iflags_set(ip
, XFS_IDIRTY_RELEASE
);
595 * This is called when the vnode reference count for the vnode
596 * goes to zero. If the file has been unlinked, then it must
597 * now be truncated. Also, we clear all of the read-ahead state
598 * kept for the inode here since the file is now closed.
604 xfs_bmap_free_t free_list
;
605 xfs_fsblock_t first_block
;
613 * If the inode is already free, then there can be nothing
616 if (ip
->i_d
.di_mode
== 0 || is_bad_inode(VFS_I(ip
))) {
617 ASSERT(ip
->i_df
.if_real_bytes
== 0);
618 ASSERT(ip
->i_df
.if_broot_bytes
== 0);
619 return VN_INACTIVE_CACHE
;
623 * Only do a truncate if it's a regular file with
624 * some actual space in it. It's OK to look at the
625 * inode's fields without the lock because we're the
626 * only one with a reference to the inode.
628 truncate
= ((ip
->i_d
.di_nlink
== 0) &&
629 ((ip
->i_d
.di_size
!= 0) || XFS_ISIZE(ip
) != 0 ||
630 (ip
->i_d
.di_nextents
> 0) || (ip
->i_delayed_blks
> 0)) &&
631 S_ISREG(ip
->i_d
.di_mode
));
637 /* If this is a read-only mount, don't do this (would generate I/O) */
638 if (mp
->m_flags
& XFS_MOUNT_RDONLY
)
641 if (ip
->i_d
.di_nlink
!= 0) {
642 if ((S_ISREG(ip
->i_d
.di_mode
) &&
643 (VFS_I(ip
)->i_size
> 0 ||
644 (VN_CACHED(VFS_I(ip
)) > 0 || ip
->i_delayed_blks
> 0)) &&
645 (ip
->i_df
.if_flags
& XFS_IFEXTENTS
) &&
646 (!(ip
->i_d
.di_flags
&
647 (XFS_DIFLAG_PREALLOC
| XFS_DIFLAG_APPEND
)) ||
648 ip
->i_delayed_blks
!= 0))) {
649 error
= xfs_free_eofblocks(mp
, ip
, 0);
651 return VN_INACTIVE_CACHE
;
656 ASSERT(ip
->i_d
.di_nlink
== 0);
658 error
= xfs_qm_dqattach(ip
, 0);
660 return VN_INACTIVE_CACHE
;
662 tp
= xfs_trans_alloc(mp
, XFS_TRANS_INACTIVE
);
664 xfs_ilock(ip
, XFS_IOLOCK_EXCL
);
666 error
= xfs_trans_reserve(tp
, 0,
667 XFS_ITRUNCATE_LOG_RES(mp
),
668 0, XFS_TRANS_PERM_LOG_RES
,
669 XFS_ITRUNCATE_LOG_COUNT
);
671 /* Don't call itruncate_cleanup */
672 ASSERT(XFS_FORCED_SHUTDOWN(mp
));
673 xfs_trans_cancel(tp
, 0);
674 xfs_iunlock(ip
, XFS_IOLOCK_EXCL
);
675 return VN_INACTIVE_CACHE
;
678 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
679 xfs_trans_ijoin(tp
, ip
, 0);
682 xfs_trans_log_inode(tp
, ip
, XFS_ILOG_CORE
);
684 error
= xfs_itruncate_extents(&tp
, ip
, XFS_DATA_FORK
, 0);
687 XFS_TRANS_RELEASE_LOG_RES
| XFS_TRANS_ABORT
);
688 xfs_iunlock(ip
, XFS_IOLOCK_EXCL
| XFS_ILOCK_EXCL
);
689 return VN_INACTIVE_CACHE
;
692 ASSERT(ip
->i_d
.di_nextents
== 0);
693 } else if (S_ISLNK(ip
->i_d
.di_mode
)) {
696 * If we get an error while cleaning up a
697 * symlink we bail out.
699 error
= (ip
->i_d
.di_size
> XFS_IFORK_DSIZE(ip
)) ?
700 xfs_inactive_symlink_rmt(ip
, &tp
) :
701 xfs_inactive_symlink_local(ip
, &tp
);
705 return VN_INACTIVE_CACHE
;
708 xfs_trans_ijoin(tp
, ip
, 0);
710 error
= xfs_trans_reserve(tp
, 0,
711 XFS_IFREE_LOG_RES(mp
),
712 0, XFS_TRANS_PERM_LOG_RES
,
713 XFS_INACTIVE_LOG_COUNT
);
715 ASSERT(XFS_FORCED_SHUTDOWN(mp
));
716 xfs_trans_cancel(tp
, 0);
717 return VN_INACTIVE_CACHE
;
720 xfs_ilock(ip
, XFS_ILOCK_EXCL
| XFS_IOLOCK_EXCL
);
721 xfs_trans_ijoin(tp
, ip
, 0);
725 * If there are attributes associated with the file
726 * then blow them away now. The code calls a routine
727 * that recursively deconstructs the attribute fork.
728 * We need to just commit the current transaction
729 * because we can't use it for xfs_attr_inactive().
731 if (ip
->i_d
.di_anextents
> 0) {
732 error
= xfs_inactive_attrs(ip
, &tp
);
734 * If we got an error, the transaction is already
735 * cancelled, and the inode is unlocked. Just get out.
738 return VN_INACTIVE_CACHE
;
739 } else if (ip
->i_afp
) {
740 xfs_idestroy_fork(ip
, XFS_ATTR_FORK
);
746 xfs_bmap_init(&free_list
, &first_block
);
747 error
= xfs_ifree(tp
, ip
, &free_list
);
750 * If we fail to free the inode, shut down. The cancel
751 * might do that, we need to make sure. Otherwise the
752 * inode might be lost for a long time or forever.
754 if (!XFS_FORCED_SHUTDOWN(mp
)) {
755 xfs_notice(mp
, "%s: xfs_ifree returned error %d",
757 xfs_force_shutdown(mp
, SHUTDOWN_META_IO_ERROR
);
759 xfs_trans_cancel(tp
, XFS_TRANS_RELEASE_LOG_RES
|XFS_TRANS_ABORT
);
762 * Credit the quota account(s). The inode is gone.
764 xfs_trans_mod_dquot_byino(tp
, ip
, XFS_TRANS_DQ_ICOUNT
, -1);
767 * Just ignore errors at this point. There is nothing we can
768 * do except to try to keep going. Make sure it's not a silent
771 error
= xfs_bmap_finish(&tp
, &free_list
, &committed
);
773 xfs_notice(mp
, "%s: xfs_bmap_finish returned error %d",
775 error
= xfs_trans_commit(tp
, XFS_TRANS_RELEASE_LOG_RES
);
777 xfs_notice(mp
, "%s: xfs_trans_commit returned error %d",
782 * Release the dquots held by inode, if any.
785 xfs_iunlock(ip
, XFS_IOLOCK_EXCL
| XFS_ILOCK_EXCL
);
788 return VN_INACTIVE_CACHE
;
792 * Lookups up an inode from "name". If ci_name is not NULL, then a CI match
793 * is allowed, otherwise it has to be an exact match. If a CI match is found,
794 * ci_name->name will point to a the actual name (caller must free) or
795 * will be set to NULL if an exact match is found.
800 struct xfs_name
*name
,
802 struct xfs_name
*ci_name
)
808 trace_xfs_lookup(dp
, name
);
810 if (XFS_FORCED_SHUTDOWN(dp
->i_mount
))
811 return XFS_ERROR(EIO
);
813 lock_mode
= xfs_ilock_map_shared(dp
);
814 error
= xfs_dir_lookup(NULL
, dp
, name
, &inum
, ci_name
);
815 xfs_iunlock_map_shared(dp
, lock_mode
);
820 error
= xfs_iget(dp
->i_mount
, NULL
, inum
, 0, 0, ipp
);
828 kmem_free(ci_name
->name
);
837 struct xfs_name
*name
,
842 int is_dir
= S_ISDIR(mode
);
843 struct xfs_mount
*mp
= dp
->i_mount
;
844 struct xfs_inode
*ip
= NULL
;
845 struct xfs_trans
*tp
= NULL
;
847 xfs_bmap_free_t free_list
;
848 xfs_fsblock_t first_block
;
849 boolean_t unlock_dp_on_error
= B_FALSE
;
853 struct xfs_dquot
*udqp
= NULL
;
854 struct xfs_dquot
*gdqp
= NULL
;
859 trace_xfs_create(dp
, name
);
861 if (XFS_FORCED_SHUTDOWN(mp
))
862 return XFS_ERROR(EIO
);
864 if (dp
->i_d
.di_flags
& XFS_DIFLAG_PROJINHERIT
)
865 prid
= xfs_get_projid(dp
);
867 prid
= XFS_PROJID_DEFAULT
;
870 * Make sure that we have allocated dquot(s) on disk.
872 error
= xfs_qm_vop_dqalloc(dp
, current_fsuid(), current_fsgid(), prid
,
873 XFS_QMOPT_QUOTALL
| XFS_QMOPT_INHERIT
, &udqp
, &gdqp
);
879 resblks
= XFS_MKDIR_SPACE_RES(mp
, name
->len
);
880 log_res
= XFS_MKDIR_LOG_RES(mp
);
881 log_count
= XFS_MKDIR_LOG_COUNT
;
882 tp
= xfs_trans_alloc(mp
, XFS_TRANS_MKDIR
);
884 resblks
= XFS_CREATE_SPACE_RES(mp
, name
->len
);
885 log_res
= XFS_CREATE_LOG_RES(mp
);
886 log_count
= XFS_CREATE_LOG_COUNT
;
887 tp
= xfs_trans_alloc(mp
, XFS_TRANS_CREATE
);
890 cancel_flags
= XFS_TRANS_RELEASE_LOG_RES
;
893 * Initially assume that the file does not exist and
894 * reserve the resources for that case. If that is not
895 * the case we'll drop the one we have and get a more
896 * appropriate transaction later.
898 error
= xfs_trans_reserve(tp
, resblks
, log_res
, 0,
899 XFS_TRANS_PERM_LOG_RES
, log_count
);
900 if (error
== ENOSPC
) {
901 /* flush outstanding delalloc blocks and retry */
902 xfs_flush_inodes(dp
);
903 error
= xfs_trans_reserve(tp
, resblks
, log_res
, 0,
904 XFS_TRANS_PERM_LOG_RES
, log_count
);
906 if (error
== ENOSPC
) {
907 /* No space at all so try a "no-allocation" reservation */
909 error
= xfs_trans_reserve(tp
, 0, log_res
, 0,
910 XFS_TRANS_PERM_LOG_RES
, log_count
);
914 goto out_trans_cancel
;
917 xfs_ilock(dp
, XFS_ILOCK_EXCL
| XFS_ILOCK_PARENT
);
918 unlock_dp_on_error
= B_TRUE
;
920 xfs_bmap_init(&free_list
, &first_block
);
923 * Reserve disk quota and the inode.
925 error
= xfs_trans_reserve_quota(tp
, mp
, udqp
, gdqp
, resblks
, 1, 0);
927 goto out_trans_cancel
;
929 error
= xfs_dir_canenter(tp
, dp
, name
, resblks
);
931 goto out_trans_cancel
;
934 * A newly created regular or special file just has one directory
935 * entry pointing to them, but a directory also the "." entry
936 * pointing to itself.
938 error
= xfs_dir_ialloc(&tp
, dp
, mode
, is_dir
? 2 : 1, rdev
,
939 prid
, resblks
> 0, &ip
, &committed
);
942 goto out_trans_cancel
;
943 goto out_trans_abort
;
947 * Now we join the directory inode to the transaction. We do not do it
948 * earlier because xfs_dir_ialloc might commit the previous transaction
949 * (and release all the locks). An error from here on will result in
950 * the transaction cancel unlocking dp so don't do it explicitly in the
953 xfs_trans_ijoin(tp
, dp
, XFS_ILOCK_EXCL
);
954 unlock_dp_on_error
= B_FALSE
;
956 error
= xfs_dir_createname(tp
, dp
, name
, ip
->i_ino
,
957 &first_block
, &free_list
, resblks
?
958 resblks
- XFS_IALLOC_SPACE_RES(mp
) : 0);
960 ASSERT(error
!= ENOSPC
);
961 goto out_trans_abort
;
963 xfs_trans_ichgtime(tp
, dp
, XFS_ICHGTIME_MOD
| XFS_ICHGTIME_CHG
);
964 xfs_trans_log_inode(tp
, dp
, XFS_ILOG_CORE
);
967 error
= xfs_dir_init(tp
, ip
, dp
);
969 goto out_bmap_cancel
;
971 error
= xfs_bumplink(tp
, dp
);
973 goto out_bmap_cancel
;
977 * If this is a synchronous mount, make sure that the
978 * create transaction goes to disk before returning to
981 if (mp
->m_flags
& (XFS_MOUNT_WSYNC
|XFS_MOUNT_DIRSYNC
))
982 xfs_trans_set_sync(tp
);
985 * Attach the dquot(s) to the inodes and modify them incore.
986 * These ids of the inode couldn't have changed since the new
987 * inode has been locked ever since it was created.
989 xfs_qm_vop_create_dqattach(tp
, ip
, udqp
, gdqp
);
991 error
= xfs_bmap_finish(&tp
, &free_list
, &committed
);
993 goto out_bmap_cancel
;
995 error
= xfs_trans_commit(tp
, XFS_TRANS_RELEASE_LOG_RES
);
997 goto out_release_inode
;
1000 xfs_qm_dqrele(gdqp
);
1006 xfs_bmap_cancel(&free_list
);
1008 cancel_flags
|= XFS_TRANS_ABORT
;
1010 xfs_trans_cancel(tp
, cancel_flags
);
1013 * Wait until after the current transaction is aborted to
1014 * release the inode. This prevents recursive transactions
1015 * and deadlocks from xfs_inactive.
1020 xfs_qm_dqrele(udqp
);
1021 xfs_qm_dqrele(gdqp
);
1023 if (unlock_dp_on_error
)
1024 xfs_iunlock(dp
, XFS_ILOCK_EXCL
);
1030 int xfs_small_retries
;
1031 int xfs_middle_retries
;
1032 int xfs_lots_retries
;
1033 int xfs_lock_delays
;
1037 * Bump the subclass so xfs_lock_inodes() acquires each lock with
1041 xfs_lock_inumorder(int lock_mode
, int subclass
)
1043 if (lock_mode
& (XFS_IOLOCK_SHARED
|XFS_IOLOCK_EXCL
))
1044 lock_mode
|= (subclass
+ XFS_LOCK_INUMORDER
) << XFS_IOLOCK_SHIFT
;
1045 if (lock_mode
& (XFS_ILOCK_SHARED
|XFS_ILOCK_EXCL
))
1046 lock_mode
|= (subclass
+ XFS_LOCK_INUMORDER
) << XFS_ILOCK_SHIFT
;
1052 * The following routine will lock n inodes in exclusive mode.
1053 * We assume the caller calls us with the inodes in i_ino order.
1055 * We need to detect deadlock where an inode that we lock
1056 * is in the AIL and we start waiting for another inode that is locked
1057 * by a thread in a long running transaction (such as truncate). This can
1058 * result in deadlock since the long running trans might need to wait
1059 * for the inode we just locked in order to push the tail and free space
1068 int attempts
= 0, i
, j
, try_lock
;
1071 ASSERT(ips
&& (inodes
>= 2)); /* we need at least two */
1077 for (; i
< inodes
; i
++) {
1080 if (i
&& (ips
[i
] == ips
[i
-1])) /* Already locked */
1084 * If try_lock is not set yet, make sure all locked inodes
1085 * are not in the AIL.
1086 * If any are, set try_lock to be used later.
1090 for (j
= (i
- 1); j
>= 0 && !try_lock
; j
--) {
1091 lp
= (xfs_log_item_t
*)ips
[j
]->i_itemp
;
1092 if (lp
&& (lp
->li_flags
& XFS_LI_IN_AIL
)) {
1099 * If any of the previous locks we have locked is in the AIL,
1100 * we must TRY to get the second and subsequent locks. If
1101 * we can't get any, we must release all we have
1106 /* try_lock must be 0 if i is 0. */
1108 * try_lock means we have an inode locked
1109 * that is in the AIL.
1112 if (!xfs_ilock_nowait(ips
[i
], xfs_lock_inumorder(lock_mode
, i
))) {
1116 * Unlock all previous guys and try again.
1117 * xfs_iunlock will try to push the tail
1118 * if the inode is in the AIL.
1121 for(j
= i
- 1; j
>= 0; j
--) {
1124 * Check to see if we've already
1125 * unlocked this one.
1126 * Not the first one going back,
1127 * and the inode ptr is the same.
1129 if ((j
!= (i
- 1)) && ips
[j
] ==
1133 xfs_iunlock(ips
[j
], lock_mode
);
1136 if ((attempts
% 5) == 0) {
1137 delay(1); /* Don't just spin the CPU */
1147 xfs_ilock(ips
[i
], xfs_lock_inumorder(lock_mode
, i
));
1153 if (attempts
< 5) xfs_small_retries
++;
1154 else if (attempts
< 100) xfs_middle_retries
++;
1155 else xfs_lots_retries
++;
1163 * xfs_lock_two_inodes() can only be used to lock one type of lock
1164 * at a time - the iolock or the ilock, but not both at once. If
1165 * we lock both at once, lockdep will report false positives saying
1166 * we have violated locking orders.
1169 xfs_lock_two_inodes(
1178 if (lock_mode
& (XFS_IOLOCK_SHARED
|XFS_IOLOCK_EXCL
))
1179 ASSERT((lock_mode
& (XFS_ILOCK_SHARED
|XFS_ILOCK_EXCL
)) == 0);
1180 ASSERT(ip0
->i_ino
!= ip1
->i_ino
);
1182 if (ip0
->i_ino
> ip1
->i_ino
) {
1189 xfs_ilock(ip0
, xfs_lock_inumorder(lock_mode
, 0));
1192 * If the first lock we have locked is in the AIL, we must TRY to get
1193 * the second lock. If we can't get it, we must release the first one
1196 lp
= (xfs_log_item_t
*)ip0
->i_itemp
;
1197 if (lp
&& (lp
->li_flags
& XFS_LI_IN_AIL
)) {
1198 if (!xfs_ilock_nowait(ip1
, xfs_lock_inumorder(lock_mode
, 1))) {
1199 xfs_iunlock(ip0
, lock_mode
);
1200 if ((++attempts
% 5) == 0)
1201 delay(1); /* Don't just spin the CPU */
1205 xfs_ilock(ip1
, xfs_lock_inumorder(lock_mode
, 1));
1212 struct xfs_name
*name
,
1215 xfs_mount_t
*mp
= dp
->i_mount
;
1216 xfs_trans_t
*tp
= NULL
;
1217 int is_dir
= S_ISDIR(ip
->i_d
.di_mode
);
1219 xfs_bmap_free_t free_list
;
1220 xfs_fsblock_t first_block
;
1227 trace_xfs_remove(dp
, name
);
1229 if (XFS_FORCED_SHUTDOWN(mp
))
1230 return XFS_ERROR(EIO
);
1232 error
= xfs_qm_dqattach(dp
, 0);
1236 error
= xfs_qm_dqattach(ip
, 0);
1241 tp
= xfs_trans_alloc(mp
, XFS_TRANS_RMDIR
);
1242 log_count
= XFS_DEFAULT_LOG_COUNT
;
1244 tp
= xfs_trans_alloc(mp
, XFS_TRANS_REMOVE
);
1245 log_count
= XFS_REMOVE_LOG_COUNT
;
1247 cancel_flags
= XFS_TRANS_RELEASE_LOG_RES
;
1250 * We try to get the real space reservation first,
1251 * allowing for directory btree deletion(s) implying
1252 * possible bmap insert(s). If we can't get the space
1253 * reservation then we use 0 instead, and avoid the bmap
1254 * btree insert(s) in the directory code by, if the bmap
1255 * insert tries to happen, instead trimming the LAST
1256 * block from the directory.
1258 resblks
= XFS_REMOVE_SPACE_RES(mp
);
1259 error
= xfs_trans_reserve(tp
, resblks
, XFS_REMOVE_LOG_RES(mp
), 0,
1260 XFS_TRANS_PERM_LOG_RES
, log_count
);
1261 if (error
== ENOSPC
) {
1263 error
= xfs_trans_reserve(tp
, 0, XFS_REMOVE_LOG_RES(mp
), 0,
1264 XFS_TRANS_PERM_LOG_RES
, log_count
);
1267 ASSERT(error
!= ENOSPC
);
1269 goto out_trans_cancel
;
1272 xfs_lock_two_inodes(dp
, ip
, XFS_ILOCK_EXCL
);
1274 xfs_trans_ijoin(tp
, dp
, XFS_ILOCK_EXCL
);
1275 xfs_trans_ijoin(tp
, ip
, XFS_ILOCK_EXCL
);
1278 * If we're removing a directory perform some additional validation.
1281 ASSERT(ip
->i_d
.di_nlink
>= 2);
1282 if (ip
->i_d
.di_nlink
!= 2) {
1283 error
= XFS_ERROR(ENOTEMPTY
);
1284 goto out_trans_cancel
;
1286 if (!xfs_dir_isempty(ip
)) {
1287 error
= XFS_ERROR(ENOTEMPTY
);
1288 goto out_trans_cancel
;
1292 xfs_bmap_init(&free_list
, &first_block
);
1293 error
= xfs_dir_removename(tp
, dp
, name
, ip
->i_ino
,
1294 &first_block
, &free_list
, resblks
);
1296 ASSERT(error
!= ENOENT
);
1297 goto out_bmap_cancel
;
1299 xfs_trans_ichgtime(tp
, dp
, XFS_ICHGTIME_MOD
| XFS_ICHGTIME_CHG
);
1303 * Drop the link from ip's "..".
1305 error
= xfs_droplink(tp
, dp
);
1307 goto out_bmap_cancel
;
1310 * Drop the "." link from ip to self.
1312 error
= xfs_droplink(tp
, ip
);
1314 goto out_bmap_cancel
;
1317 * When removing a non-directory we need to log the parent
1318 * inode here. For a directory this is done implicitly
1319 * by the xfs_droplink call for the ".." entry.
1321 xfs_trans_log_inode(tp
, dp
, XFS_ILOG_CORE
);
1325 * Drop the link from dp to ip.
1327 error
= xfs_droplink(tp
, ip
);
1329 goto out_bmap_cancel
;
1332 * Determine if this is the last link while
1333 * we are in the transaction.
1335 link_zero
= (ip
->i_d
.di_nlink
== 0);
1338 * If this is a synchronous mount, make sure that the
1339 * remove transaction goes to disk before returning to
1342 if (mp
->m_flags
& (XFS_MOUNT_WSYNC
|XFS_MOUNT_DIRSYNC
))
1343 xfs_trans_set_sync(tp
);
1345 error
= xfs_bmap_finish(&tp
, &free_list
, &committed
);
1347 goto out_bmap_cancel
;
1349 error
= xfs_trans_commit(tp
, XFS_TRANS_RELEASE_LOG_RES
);
1354 * If we are using filestreams, kill the stream association.
1355 * If the file is still open it may get a new one but that
1356 * will get killed on last close in xfs_close() so we don't
1357 * have to worry about that.
1359 if (!is_dir
&& link_zero
&& xfs_inode_is_filestream(ip
))
1360 xfs_filestream_deassociate(ip
);
1365 xfs_bmap_cancel(&free_list
);
1366 cancel_flags
|= XFS_TRANS_ABORT
;
1368 xfs_trans_cancel(tp
, cancel_flags
);
1377 struct xfs_name
*target_name
)
1379 xfs_mount_t
*mp
= tdp
->i_mount
;
1382 xfs_bmap_free_t free_list
;
1383 xfs_fsblock_t first_block
;
1388 trace_xfs_link(tdp
, target_name
);
1390 ASSERT(!S_ISDIR(sip
->i_d
.di_mode
));
1392 if (XFS_FORCED_SHUTDOWN(mp
))
1393 return XFS_ERROR(EIO
);
1395 error
= xfs_qm_dqattach(sip
, 0);
1399 error
= xfs_qm_dqattach(tdp
, 0);
1403 tp
= xfs_trans_alloc(mp
, XFS_TRANS_LINK
);
1404 cancel_flags
= XFS_TRANS_RELEASE_LOG_RES
;
1405 resblks
= XFS_LINK_SPACE_RES(mp
, target_name
->len
);
1406 error
= xfs_trans_reserve(tp
, resblks
, XFS_LINK_LOG_RES(mp
), 0,
1407 XFS_TRANS_PERM_LOG_RES
, XFS_LINK_LOG_COUNT
);
1408 if (error
== ENOSPC
) {
1410 error
= xfs_trans_reserve(tp
, 0, XFS_LINK_LOG_RES(mp
), 0,
1411 XFS_TRANS_PERM_LOG_RES
, XFS_LINK_LOG_COUNT
);
1418 xfs_lock_two_inodes(sip
, tdp
, XFS_ILOCK_EXCL
);
1420 xfs_trans_ijoin(tp
, sip
, XFS_ILOCK_EXCL
);
1421 xfs_trans_ijoin(tp
, tdp
, XFS_ILOCK_EXCL
);
1424 * If we are using project inheritance, we only allow hard link
1425 * creation in our tree when the project IDs are the same; else
1426 * the tree quota mechanism could be circumvented.
1428 if (unlikely((tdp
->i_d
.di_flags
& XFS_DIFLAG_PROJINHERIT
) &&
1429 (xfs_get_projid(tdp
) != xfs_get_projid(sip
)))) {
1430 error
= XFS_ERROR(EXDEV
);
1434 error
= xfs_dir_canenter(tp
, tdp
, target_name
, resblks
);
1438 xfs_bmap_init(&free_list
, &first_block
);
1440 error
= xfs_dir_createname(tp
, tdp
, target_name
, sip
->i_ino
,
1441 &first_block
, &free_list
, resblks
);
1444 xfs_trans_ichgtime(tp
, tdp
, XFS_ICHGTIME_MOD
| XFS_ICHGTIME_CHG
);
1445 xfs_trans_log_inode(tp
, tdp
, XFS_ILOG_CORE
);
1447 error
= xfs_bumplink(tp
, sip
);
1452 * If this is a synchronous mount, make sure that the
1453 * link transaction goes to disk before returning to
1456 if (mp
->m_flags
& (XFS_MOUNT_WSYNC
|XFS_MOUNT_DIRSYNC
)) {
1457 xfs_trans_set_sync(tp
);
1460 error
= xfs_bmap_finish (&tp
, &free_list
, &committed
);
1462 xfs_bmap_cancel(&free_list
);
1466 return xfs_trans_commit(tp
, XFS_TRANS_RELEASE_LOG_RES
);
1469 cancel_flags
|= XFS_TRANS_ABORT
;
1471 xfs_trans_cancel(tp
, cancel_flags
);
1479 struct xfs_name
*link_name
,
1480 const char *target_path
,
1484 xfs_mount_t
*mp
= dp
->i_mount
;
1489 xfs_bmap_free_t free_list
;
1490 xfs_fsblock_t first_block
;
1491 boolean_t unlock_dp_on_error
= B_FALSE
;
1494 xfs_fileoff_t first_fsb
;
1495 xfs_filblks_t fs_blocks
;
1497 xfs_bmbt_irec_t mval
[SYMLINK_MAPS
];
1499 const char *cur_chunk
;
1504 struct xfs_dquot
*udqp
, *gdqp
;
1512 trace_xfs_symlink(dp
, link_name
);
1514 if (XFS_FORCED_SHUTDOWN(mp
))
1515 return XFS_ERROR(EIO
);
1518 * Check component lengths of the target path name.
1520 pathlen
= strlen(target_path
);
1521 if (pathlen
>= MAXPATHLEN
) /* total string too long */
1522 return XFS_ERROR(ENAMETOOLONG
);
1525 if (dp
->i_d
.di_flags
& XFS_DIFLAG_PROJINHERIT
)
1526 prid
= xfs_get_projid(dp
);
1528 prid
= XFS_PROJID_DEFAULT
;
1531 * Make sure that we have allocated dquot(s) on disk.
1533 error
= xfs_qm_vop_dqalloc(dp
, current_fsuid(), current_fsgid(), prid
,
1534 XFS_QMOPT_QUOTALL
| XFS_QMOPT_INHERIT
, &udqp
, &gdqp
);
1538 tp
= xfs_trans_alloc(mp
, XFS_TRANS_SYMLINK
);
1539 cancel_flags
= XFS_TRANS_RELEASE_LOG_RES
;
1541 * The symlink will fit into the inode data fork?
1542 * There can't be any attributes so we get the whole variable part.
1544 if (pathlen
<= XFS_LITINO(mp
))
1547 fs_blocks
= XFS_B_TO_FSB(mp
, pathlen
);
1548 resblks
= XFS_SYMLINK_SPACE_RES(mp
, link_name
->len
, fs_blocks
);
1549 error
= xfs_trans_reserve(tp
, resblks
, XFS_SYMLINK_LOG_RES(mp
), 0,
1550 XFS_TRANS_PERM_LOG_RES
, XFS_SYMLINK_LOG_COUNT
);
1551 if (error
== ENOSPC
&& fs_blocks
== 0) {
1553 error
= xfs_trans_reserve(tp
, 0, XFS_SYMLINK_LOG_RES(mp
), 0,
1554 XFS_TRANS_PERM_LOG_RES
, XFS_SYMLINK_LOG_COUNT
);
1561 xfs_ilock(dp
, XFS_ILOCK_EXCL
| XFS_ILOCK_PARENT
);
1562 unlock_dp_on_error
= B_TRUE
;
1565 * Check whether the directory allows new symlinks or not.
1567 if (dp
->i_d
.di_flags
& XFS_DIFLAG_NOSYMLINKS
) {
1568 error
= XFS_ERROR(EPERM
);
1573 * Reserve disk quota : blocks and inode.
1575 error
= xfs_trans_reserve_quota(tp
, mp
, udqp
, gdqp
, resblks
, 1, 0);
1580 * Check for ability to enter directory entry, if no space reserved.
1582 error
= xfs_dir_canenter(tp
, dp
, link_name
, resblks
);
1586 * Initialize the bmap freelist prior to calling either
1587 * bmapi or the directory create code.
1589 xfs_bmap_init(&free_list
, &first_block
);
1592 * Allocate an inode for the symlink.
1594 error
= xfs_dir_ialloc(&tp
, dp
, S_IFLNK
| (mode
& ~S_IFMT
), 1, 0,
1595 prid
, resblks
> 0, &ip
, NULL
);
1597 if (error
== ENOSPC
)
1603 * An error after we've joined dp to the transaction will result in the
1604 * transaction cancel unlocking dp so don't do it explicitly in the
1607 xfs_trans_ijoin(tp
, dp
, XFS_ILOCK_EXCL
);
1608 unlock_dp_on_error
= B_FALSE
;
1611 * Also attach the dquot(s) to it, if applicable.
1613 xfs_qm_vop_create_dqattach(tp
, ip
, udqp
, gdqp
);
1616 resblks
-= XFS_IALLOC_SPACE_RES(mp
);
1618 * If the symlink will fit into the inode, write it inline.
1620 if (pathlen
<= XFS_IFORK_DSIZE(ip
)) {
1621 xfs_idata_realloc(ip
, pathlen
, XFS_DATA_FORK
);
1622 memcpy(ip
->i_df
.if_u1
.if_data
, target_path
, pathlen
);
1623 ip
->i_d
.di_size
= pathlen
;
1626 * The inode was initially created in extent format.
1628 ip
->i_df
.if_flags
&= ~(XFS_IFEXTENTS
| XFS_IFBROOT
);
1629 ip
->i_df
.if_flags
|= XFS_IFINLINE
;
1631 ip
->i_d
.di_format
= XFS_DINODE_FMT_LOCAL
;
1632 xfs_trans_log_inode(tp
, ip
, XFS_ILOG_DDATA
| XFS_ILOG_CORE
);
1636 nmaps
= SYMLINK_MAPS
;
1638 error
= xfs_bmapi_write(tp
, ip
, first_fsb
, fs_blocks
,
1639 XFS_BMAPI_METADATA
, &first_block
, resblks
,
1640 mval
, &nmaps
, &free_list
);
1645 resblks
-= fs_blocks
;
1646 ip
->i_d
.di_size
= pathlen
;
1647 xfs_trans_log_inode(tp
, ip
, XFS_ILOG_CORE
);
1649 cur_chunk
= target_path
;
1650 for (n
= 0; n
< nmaps
; n
++) {
1651 d
= XFS_FSB_TO_DADDR(mp
, mval
[n
].br_startblock
);
1652 byte_cnt
= XFS_FSB_TO_B(mp
, mval
[n
].br_blockcount
);
1653 bp
= xfs_trans_get_buf(tp
, mp
->m_ddev_targp
, d
,
1654 BTOBB(byte_cnt
), 0);
1659 if (pathlen
< byte_cnt
) {
1662 pathlen
-= byte_cnt
;
1664 memcpy(bp
->b_addr
, cur_chunk
, byte_cnt
);
1665 cur_chunk
+= byte_cnt
;
1667 xfs_trans_log_buf(tp
, bp
, 0, byte_cnt
- 1);
1672 * Create the directory entry for the symlink.
1674 error
= xfs_dir_createname(tp
, dp
, link_name
, ip
->i_ino
,
1675 &first_block
, &free_list
, resblks
);
1678 xfs_trans_ichgtime(tp
, dp
, XFS_ICHGTIME_MOD
| XFS_ICHGTIME_CHG
);
1679 xfs_trans_log_inode(tp
, dp
, XFS_ILOG_CORE
);
1682 * If this is a synchronous mount, make sure that the
1683 * symlink transaction goes to disk before returning to
1686 if (mp
->m_flags
& (XFS_MOUNT_WSYNC
|XFS_MOUNT_DIRSYNC
)) {
1687 xfs_trans_set_sync(tp
);
1690 error
= xfs_bmap_finish(&tp
, &free_list
, &committed
);
1694 error
= xfs_trans_commit(tp
, XFS_TRANS_RELEASE_LOG_RES
);
1695 xfs_qm_dqrele(udqp
);
1696 xfs_qm_dqrele(gdqp
);
1704 xfs_bmap_cancel(&free_list
);
1705 cancel_flags
|= XFS_TRANS_ABORT
;
1707 xfs_trans_cancel(tp
, cancel_flags
);
1708 xfs_qm_dqrele(udqp
);
1709 xfs_qm_dqrele(gdqp
);
1711 if (unlock_dp_on_error
)
1712 xfs_iunlock(dp
, XFS_ILOCK_EXCL
);
1723 xfs_mount_t
*mp
= ip
->i_mount
;
1727 if (!capable(CAP_SYS_ADMIN
))
1728 return XFS_ERROR(EPERM
);
1730 if (XFS_FORCED_SHUTDOWN(mp
))
1731 return XFS_ERROR(EIO
);
1733 tp
= xfs_trans_alloc(mp
, XFS_TRANS_SET_DMATTRS
);
1734 error
= xfs_trans_reserve(tp
, 0, XFS_ICHANGE_LOG_RES (mp
), 0, 0, 0);
1736 xfs_trans_cancel(tp
, 0);
1739 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
1740 xfs_trans_ijoin(tp
, ip
, XFS_ILOCK_EXCL
);
1742 ip
->i_d
.di_dmevmask
= evmask
;
1743 ip
->i_d
.di_dmstate
= state
;
1745 xfs_trans_log_inode(tp
, ip
, XFS_ILOG_CORE
);
1746 error
= xfs_trans_commit(tp
, 0);
1752 * xfs_alloc_file_space()
1753 * This routine allocates disk space for the given file.
1755 * If alloc_type == 0, this request is for an ALLOCSP type
1756 * request which will change the file size. In this case, no
1757 * DMAPI event will be generated by the call. A TRUNCATE event
1758 * will be generated later by xfs_setattr.
1760 * If alloc_type != 0, this request is for a RESVSP type
1761 * request, and a DMAPI DM_EVENT_WRITE will be generated if the
1762 * lower block boundary byte address is less than the file's
1771 xfs_alloc_file_space(
1778 xfs_mount_t
*mp
= ip
->i_mount
;
1780 xfs_filblks_t allocated_fsb
;
1781 xfs_filblks_t allocatesize_fsb
;
1782 xfs_extlen_t extsz
, temp
;
1783 xfs_fileoff_t startoffset_fsb
;
1784 xfs_fsblock_t firstfsb
;
1789 xfs_bmbt_irec_t imaps
[1], *imapp
;
1790 xfs_bmap_free_t free_list
;
1791 uint qblocks
, resblks
, resrtextents
;
1795 trace_xfs_alloc_file_space(ip
);
1797 if (XFS_FORCED_SHUTDOWN(mp
))
1798 return XFS_ERROR(EIO
);
1800 error
= xfs_qm_dqattach(ip
, 0);
1805 return XFS_ERROR(EINVAL
);
1807 rt
= XFS_IS_REALTIME_INODE(ip
);
1808 extsz
= xfs_get_extsz_hint(ip
);
1813 startoffset_fsb
= XFS_B_TO_FSBT(mp
, offset
);
1814 allocatesize_fsb
= XFS_B_TO_FSB(mp
, count
);
1817 * Allocate file space until done or until there is an error
1819 while (allocatesize_fsb
&& !error
) {
1823 * Determine space reservations for data/realtime.
1825 if (unlikely(extsz
)) {
1826 s
= startoffset_fsb
;
1829 e
= startoffset_fsb
+ allocatesize_fsb
;
1830 if ((temp
= do_mod(startoffset_fsb
, extsz
)))
1832 if ((temp
= do_mod(e
, extsz
)))
1836 e
= allocatesize_fsb
;
1840 * The transaction reservation is limited to a 32-bit block
1841 * count, hence we need to limit the number of blocks we are
1842 * trying to reserve to avoid an overflow. We can't allocate
1843 * more than @nimaps extents, and an extent is limited on disk
1844 * to MAXEXTLEN (21 bits), so use that to enforce the limit.
1846 resblks
= min_t(xfs_fileoff_t
, (e
- s
), (MAXEXTLEN
* nimaps
));
1848 resrtextents
= qblocks
= resblks
;
1849 resrtextents
/= mp
->m_sb
.sb_rextsize
;
1850 resblks
= XFS_DIOSTRAT_SPACE_RES(mp
, 0);
1851 quota_flag
= XFS_QMOPT_RES_RTBLKS
;
1854 resblks
= qblocks
= XFS_DIOSTRAT_SPACE_RES(mp
, resblks
);
1855 quota_flag
= XFS_QMOPT_RES_REGBLKS
;
1859 * Allocate and setup the transaction.
1861 tp
= xfs_trans_alloc(mp
, XFS_TRANS_DIOSTRAT
);
1862 error
= xfs_trans_reserve(tp
, resblks
,
1863 XFS_WRITE_LOG_RES(mp
), resrtextents
,
1864 XFS_TRANS_PERM_LOG_RES
,
1865 XFS_WRITE_LOG_COUNT
);
1867 * Check for running out of space
1871 * Free the transaction structure.
1873 ASSERT(error
== ENOSPC
|| XFS_FORCED_SHUTDOWN(mp
));
1874 xfs_trans_cancel(tp
, 0);
1877 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
1878 error
= xfs_trans_reserve_quota_nblks(tp
, ip
, qblocks
,
1883 xfs_trans_ijoin(tp
, ip
, 0);
1885 xfs_bmap_init(&free_list
, &firstfsb
);
1886 error
= xfs_bmapi_write(tp
, ip
, startoffset_fsb
,
1887 allocatesize_fsb
, alloc_type
, &firstfsb
,
1888 0, imapp
, &nimaps
, &free_list
);
1894 * Complete the transaction
1896 error
= xfs_bmap_finish(&tp
, &free_list
, &committed
);
1901 error
= xfs_trans_commit(tp
, XFS_TRANS_RELEASE_LOG_RES
);
1902 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
1907 allocated_fsb
= imapp
->br_blockcount
;
1910 error
= XFS_ERROR(ENOSPC
);
1914 startoffset_fsb
+= allocated_fsb
;
1915 allocatesize_fsb
-= allocated_fsb
;
1920 error0
: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */
1921 xfs_bmap_cancel(&free_list
);
1922 xfs_trans_unreserve_quota_nblks(tp
, ip
, qblocks
, 0, quota_flag
);
1924 error1
: /* Just cancel transaction */
1925 xfs_trans_cancel(tp
, XFS_TRANS_RELEASE_LOG_RES
| XFS_TRANS_ABORT
);
1926 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
1931 * Zero file bytes between startoff and endoff inclusive.
1932 * The iolock is held exclusive and no blocks are buffered.
1934 * This function is used by xfs_free_file_space() to zero
1935 * partial blocks when the range to free is not block aligned.
1936 * When unreserving space with boundaries that are not block
1937 * aligned we round up the start and round down the end
1938 * boundaries and then use this function to zero the parts of
1939 * the blocks that got dropped during the rounding.
1942 xfs_zero_remaining_bytes(
1947 xfs_bmbt_irec_t imap
;
1948 xfs_fileoff_t offset_fsb
;
1949 xfs_off_t lastoffset
;
1952 xfs_mount_t
*mp
= ip
->i_mount
;
1957 * Avoid doing I/O beyond eof - it's not necessary
1958 * since nothing can read beyond eof. The space will
1959 * be zeroed when the file is extended anyway.
1961 if (startoff
>= XFS_ISIZE(ip
))
1964 if (endoff
> XFS_ISIZE(ip
))
1965 endoff
= XFS_ISIZE(ip
);
1967 bp
= xfs_buf_get_uncached(XFS_IS_REALTIME_INODE(ip
) ?
1968 mp
->m_rtdev_targp
: mp
->m_ddev_targp
,
1969 mp
->m_sb
.sb_blocksize
, XBF_DONT_BLOCK
);
1971 return XFS_ERROR(ENOMEM
);
1975 for (offset
= startoff
; offset
<= endoff
; offset
= lastoffset
+ 1) {
1976 offset_fsb
= XFS_B_TO_FSBT(mp
, offset
);
1978 error
= xfs_bmapi_read(ip
, offset_fsb
, 1, &imap
, &nimap
, 0);
1979 if (error
|| nimap
< 1)
1981 ASSERT(imap
.br_blockcount
>= 1);
1982 ASSERT(imap
.br_startoff
== offset_fsb
);
1983 lastoffset
= XFS_FSB_TO_B(mp
, imap
.br_startoff
+ 1) - 1;
1984 if (lastoffset
> endoff
)
1985 lastoffset
= endoff
;
1986 if (imap
.br_startblock
== HOLESTARTBLOCK
)
1988 ASSERT(imap
.br_startblock
!= DELAYSTARTBLOCK
);
1989 if (imap
.br_state
== XFS_EXT_UNWRITTEN
)
1992 XFS_BUF_UNWRITE(bp
);
1994 XFS_BUF_SET_ADDR(bp
, xfs_fsb_to_db(ip
, imap
.br_startblock
));
1996 error
= xfs_buf_iowait(bp
);
1998 xfs_buf_ioerror_alert(bp
,
1999 "xfs_zero_remaining_bytes(read)");
2003 (offset
- XFS_FSB_TO_B(mp
, imap
.br_startoff
)),
2004 0, lastoffset
- offset
+ 1);
2009 error
= xfs_buf_iowait(bp
);
2011 xfs_buf_ioerror_alert(bp
,
2012 "xfs_zero_remaining_bytes(write)");
2021 * xfs_free_file_space()
2022 * This routine frees disk space for the given file.
2024 * This routine is only called by xfs_change_file_space
2025 * for an UNRESVSP type call.
2033 xfs_free_file_space(
2041 xfs_fileoff_t endoffset_fsb
;
2043 xfs_fsblock_t firstfsb
;
2044 xfs_bmap_free_t free_list
;
2045 xfs_bmbt_irec_t imap
;
2053 xfs_fileoff_t startoffset_fsb
;
2055 int need_iolock
= 1;
2059 trace_xfs_free_file_space(ip
);
2061 error
= xfs_qm_dqattach(ip
, 0);
2066 if (len
<= 0) /* if nothing being freed */
2068 rt
= XFS_IS_REALTIME_INODE(ip
);
2069 startoffset_fsb
= XFS_B_TO_FSB(mp
, offset
);
2070 endoffset_fsb
= XFS_B_TO_FSBT(mp
, offset
+ len
);
2072 if (attr_flags
& XFS_ATTR_NOLOCK
)
2075 xfs_ilock(ip
, XFS_IOLOCK_EXCL
);
2076 /* wait for the completion of any pending DIOs */
2077 inode_dio_wait(VFS_I(ip
));
2080 rounding
= max_t(uint
, 1 << mp
->m_sb
.sb_blocklog
, PAGE_CACHE_SIZE
);
2081 ioffset
= offset
& ~(rounding
- 1);
2083 if (VN_CACHED(VFS_I(ip
)) != 0) {
2084 error
= xfs_flushinval_pages(ip
, ioffset
, -1, FI_REMAPF_LOCKED
);
2086 goto out_unlock_iolock
;
2090 * Need to zero the stuff we're not freeing, on disk.
2091 * If it's a realtime file & can't use unwritten extents then we
2092 * actually need to zero the extent edges. Otherwise xfs_bunmapi
2093 * will take care of it for us.
2095 if (rt
&& !xfs_sb_version_hasextflgbit(&mp
->m_sb
)) {
2097 error
= xfs_bmapi_read(ip
, startoffset_fsb
, 1,
2100 goto out_unlock_iolock
;
2101 ASSERT(nimap
== 0 || nimap
== 1);
2102 if (nimap
&& imap
.br_startblock
!= HOLESTARTBLOCK
) {
2105 ASSERT(imap
.br_startblock
!= DELAYSTARTBLOCK
);
2106 block
= imap
.br_startblock
;
2107 mod
= do_div(block
, mp
->m_sb
.sb_rextsize
);
2109 startoffset_fsb
+= mp
->m_sb
.sb_rextsize
- mod
;
2112 error
= xfs_bmapi_read(ip
, endoffset_fsb
- 1, 1,
2115 goto out_unlock_iolock
;
2116 ASSERT(nimap
== 0 || nimap
== 1);
2117 if (nimap
&& imap
.br_startblock
!= HOLESTARTBLOCK
) {
2118 ASSERT(imap
.br_startblock
!= DELAYSTARTBLOCK
);
2120 if (mod
&& (mod
!= mp
->m_sb
.sb_rextsize
))
2121 endoffset_fsb
-= mod
;
2124 if ((done
= (endoffset_fsb
<= startoffset_fsb
)))
2126 * One contiguous piece to clear
2128 error
= xfs_zero_remaining_bytes(ip
, offset
, offset
+ len
- 1);
2131 * Some full blocks, possibly two pieces to clear
2133 if (offset
< XFS_FSB_TO_B(mp
, startoffset_fsb
))
2134 error
= xfs_zero_remaining_bytes(ip
, offset
,
2135 XFS_FSB_TO_B(mp
, startoffset_fsb
) - 1);
2137 XFS_FSB_TO_B(mp
, endoffset_fsb
) < offset
+ len
)
2138 error
= xfs_zero_remaining_bytes(ip
,
2139 XFS_FSB_TO_B(mp
, endoffset_fsb
),
2144 * free file space until done or until there is an error
2146 resblks
= XFS_DIOSTRAT_SPACE_RES(mp
, 0);
2147 while (!error
&& !done
) {
2150 * allocate and setup the transaction. Allow this
2151 * transaction to dip into the reserve blocks to ensure
2152 * the freeing of the space succeeds at ENOSPC.
2154 tp
= xfs_trans_alloc(mp
, XFS_TRANS_DIOSTRAT
);
2155 tp
->t_flags
|= XFS_TRANS_RESERVE
;
2156 error
= xfs_trans_reserve(tp
,
2158 XFS_WRITE_LOG_RES(mp
),
2160 XFS_TRANS_PERM_LOG_RES
,
2161 XFS_WRITE_LOG_COUNT
);
2164 * check for running out of space
2168 * Free the transaction structure.
2170 ASSERT(error
== ENOSPC
|| XFS_FORCED_SHUTDOWN(mp
));
2171 xfs_trans_cancel(tp
, 0);
2174 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
2175 error
= xfs_trans_reserve_quota(tp
, mp
,
2176 ip
->i_udquot
, ip
->i_gdquot
,
2177 resblks
, 0, XFS_QMOPT_RES_REGBLKS
);
2181 xfs_trans_ijoin(tp
, ip
, 0);
2184 * issue the bunmapi() call to free the blocks
2186 xfs_bmap_init(&free_list
, &firstfsb
);
2187 error
= xfs_bunmapi(tp
, ip
, startoffset_fsb
,
2188 endoffset_fsb
- startoffset_fsb
,
2189 0, 2, &firstfsb
, &free_list
, &done
);
2195 * complete the transaction
2197 error
= xfs_bmap_finish(&tp
, &free_list
, &committed
);
2202 error
= xfs_trans_commit(tp
, XFS_TRANS_RELEASE_LOG_RES
);
2203 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
2208 xfs_iunlock(ip
, XFS_IOLOCK_EXCL
);
2212 xfs_bmap_cancel(&free_list
);
2214 xfs_trans_cancel(tp
, XFS_TRANS_RELEASE_LOG_RES
| XFS_TRANS_ABORT
);
2215 xfs_iunlock(ip
, need_iolock
? (XFS_ILOCK_EXCL
| XFS_IOLOCK_EXCL
) :
2221 * xfs_change_file_space()
2222 * This routine allocates or frees disk space for the given file.
2223 * The user specified parameters are checked for alignment and size
2232 xfs_change_file_space(
2239 xfs_mount_t
*mp
= ip
->i_mount
;
2244 xfs_off_t startoffset
;
2250 if (!S_ISREG(ip
->i_d
.di_mode
))
2251 return XFS_ERROR(EINVAL
);
2253 switch (bf
->l_whence
) {
2254 case 0: /*SEEK_SET*/
2256 case 1: /*SEEK_CUR*/
2257 bf
->l_start
+= offset
;
2259 case 2: /*SEEK_END*/
2260 bf
->l_start
+= XFS_ISIZE(ip
);
2263 return XFS_ERROR(EINVAL
);
2266 llen
= bf
->l_len
> 0 ? bf
->l_len
- 1 : bf
->l_len
;
2268 if ( (bf
->l_start
< 0)
2269 || (bf
->l_start
> XFS_MAXIOFFSET(mp
))
2270 || (bf
->l_start
+ llen
< 0)
2271 || (bf
->l_start
+ llen
> XFS_MAXIOFFSET(mp
)))
2272 return XFS_ERROR(EINVAL
);
2276 startoffset
= bf
->l_start
;
2277 fsize
= XFS_ISIZE(ip
);
2280 * XFS_IOC_RESVSP and XFS_IOC_UNRESVSP will reserve or unreserve
2282 * These calls do NOT zero the data space allocated to the file,
2283 * nor do they change the file size.
2285 * XFS_IOC_ALLOCSP and XFS_IOC_FREESP will allocate and free file
2287 * These calls cause the new file data to be zeroed and the file
2288 * size to be changed.
2290 setprealloc
= clrprealloc
= 0;
2291 prealloc_type
= XFS_BMAPI_PREALLOC
;
2294 case XFS_IOC_ZERO_RANGE
:
2295 prealloc_type
|= XFS_BMAPI_CONVERT
;
2296 xfs_tosspages(ip
, startoffset
, startoffset
+ bf
->l_len
, 0);
2298 case XFS_IOC_RESVSP
:
2299 case XFS_IOC_RESVSP64
:
2300 error
= xfs_alloc_file_space(ip
, startoffset
, bf
->l_len
,
2301 prealloc_type
, attr_flags
);
2307 case XFS_IOC_UNRESVSP
:
2308 case XFS_IOC_UNRESVSP64
:
2309 if ((error
= xfs_free_file_space(ip
, startoffset
, bf
->l_len
,
2314 case XFS_IOC_ALLOCSP
:
2315 case XFS_IOC_ALLOCSP64
:
2316 case XFS_IOC_FREESP
:
2317 case XFS_IOC_FREESP64
:
2318 if (startoffset
> fsize
) {
2319 error
= xfs_alloc_file_space(ip
, fsize
,
2320 startoffset
- fsize
, 0, attr_flags
);
2325 iattr
.ia_valid
= ATTR_SIZE
;
2326 iattr
.ia_size
= startoffset
;
2328 error
= xfs_setattr_size(ip
, &iattr
, attr_flags
);
2338 return XFS_ERROR(EINVAL
);
2342 * update the inode timestamp, mode, and prealloc flag bits
2344 tp
= xfs_trans_alloc(mp
, XFS_TRANS_WRITEID
);
2346 if ((error
= xfs_trans_reserve(tp
, 0, XFS_WRITEID_LOG_RES(mp
),
2349 xfs_trans_cancel(tp
, 0);
2353 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
2354 xfs_trans_ijoin(tp
, ip
, XFS_ILOCK_EXCL
);
2356 if ((attr_flags
& XFS_ATTR_DMI
) == 0) {
2357 ip
->i_d
.di_mode
&= ~S_ISUID
;
2360 * Note that we don't have to worry about mandatory
2361 * file locking being disabled here because we only
2362 * clear the S_ISGID bit if the Group execute bit is
2363 * on, but if it was on then mandatory locking wouldn't
2364 * have been enabled.
2366 if (ip
->i_d
.di_mode
& S_IXGRP
)
2367 ip
->i_d
.di_mode
&= ~S_ISGID
;
2369 xfs_trans_ichgtime(tp
, ip
, XFS_ICHGTIME_MOD
| XFS_ICHGTIME_CHG
);
2372 ip
->i_d
.di_flags
|= XFS_DIFLAG_PREALLOC
;
2373 else if (clrprealloc
)
2374 ip
->i_d
.di_flags
&= ~XFS_DIFLAG_PREALLOC
;
2376 xfs_trans_log_inode(tp
, ip
, XFS_ILOG_CORE
);
2377 if (attr_flags
& XFS_ATTR_SYNC
)
2378 xfs_trans_set_sync(tp
);
2379 return xfs_trans_commit(tp
, 0);