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
)ip
->i_size
));
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);
230 error
= xfs_itruncate_data(&tp
, ip
, ip
->i_size
);
233 * If we get an error at this point we simply don't
234 * bother truncating the file.
237 (XFS_TRANS_RELEASE_LOG_RES
|
240 error
= xfs_trans_commit(tp
,
241 XFS_TRANS_RELEASE_LOG_RES
);
243 xfs_iunlock(ip
, XFS_IOLOCK_EXCL
|XFS_ILOCK_EXCL
);
249 * Free a symlink that has blocks associated with it.
252 xfs_inactive_symlink_rmt(
260 xfs_fsblock_t first_block
;
261 xfs_bmap_free_t free_list
;
264 xfs_bmbt_irec_t mval
[SYMLINK_MAPS
];
272 ASSERT(ip
->i_d
.di_size
> XFS_IFORK_DSIZE(ip
));
274 * We're freeing a symlink that has some
275 * blocks allocated to it. Free the
276 * blocks here. We know that we've got
277 * either 1 or 2 extents and that we can
278 * free them all in one bunmapi call.
280 ASSERT(ip
->i_d
.di_nextents
> 0 && ip
->i_d
.di_nextents
<= 2);
281 if ((error
= xfs_trans_reserve(tp
, 0, XFS_ITRUNCATE_LOG_RES(mp
), 0,
282 XFS_TRANS_PERM_LOG_RES
, XFS_ITRUNCATE_LOG_COUNT
))) {
283 ASSERT(XFS_FORCED_SHUTDOWN(mp
));
284 xfs_trans_cancel(tp
, 0);
289 * Lock the inode, fix the size, and join it to the transaction.
290 * Hold it so in the normal path, we still have it locked for
291 * the second transaction. In the error paths we need it
292 * held so the cancel won't rele it, see below.
294 xfs_ilock(ip
, XFS_IOLOCK_EXCL
| XFS_ILOCK_EXCL
);
295 size
= (int)ip
->i_d
.di_size
;
297 xfs_trans_ijoin(tp
, ip
, 0);
298 xfs_trans_log_inode(tp
, ip
, XFS_ILOG_CORE
);
300 * Find the block(s) so we can inval and unmap them.
303 xfs_bmap_init(&free_list
, &first_block
);
304 nmaps
= ARRAY_SIZE(mval
);
305 error
= xfs_bmapi_read(ip
, 0, XFS_B_TO_FSB(mp
, size
),
310 * Invalidate the block(s).
312 for (i
= 0; i
< nmaps
; i
++) {
313 bp
= xfs_trans_get_buf(tp
, mp
->m_ddev_targp
,
314 XFS_FSB_TO_DADDR(mp
, mval
[i
].br_startblock
),
315 XFS_FSB_TO_BB(mp
, mval
[i
].br_blockcount
), 0);
320 xfs_trans_binval(tp
, bp
);
323 * Unmap the dead block(s) to the free_list.
325 if ((error
= xfs_bunmapi(tp
, ip
, 0, size
, XFS_BMAPI_METADATA
, nmaps
,
326 &first_block
, &free_list
, &done
)))
330 * Commit the first transaction. This logs the EFI and the inode.
332 if ((error
= xfs_bmap_finish(&tp
, &free_list
, &committed
)))
335 * The transaction must have been committed, since there were
336 * actually extents freed by xfs_bunmapi. See xfs_bmap_finish.
337 * The new tp has the extent freeing and EFDs.
341 * The first xact was committed, so add the inode to the new one.
342 * Mark it dirty so it will be logged and moved forward in the log as
343 * part of every commit.
345 xfs_trans_ijoin(tp
, ip
, 0);
346 xfs_trans_log_inode(tp
, ip
, XFS_ILOG_CORE
);
348 * Get a new, empty transaction to return to our caller.
350 ntp
= xfs_trans_dup(tp
);
352 * Commit the transaction containing extent freeing and EFDs.
353 * If we get an error on the commit here or on the reserve below,
354 * we need to unlock the inode since the new transaction doesn't
355 * have the inode attached.
357 error
= xfs_trans_commit(tp
, 0);
360 ASSERT(XFS_FORCED_SHUTDOWN(mp
));
364 * transaction commit worked ok so we can drop the extra ticket
365 * reference that we gained in xfs_trans_dup()
367 xfs_log_ticket_put(tp
->t_ticket
);
370 * Remove the memory for extent descriptions (just bookkeeping).
372 if (ip
->i_df
.if_bytes
)
373 xfs_idata_realloc(ip
, -ip
->i_df
.if_bytes
, XFS_DATA_FORK
);
374 ASSERT(ip
->i_df
.if_bytes
== 0);
376 * Put an itruncate log reservation in the new transaction
379 if ((error
= xfs_trans_reserve(tp
, 0, XFS_ITRUNCATE_LOG_RES(mp
), 0,
380 XFS_TRANS_PERM_LOG_RES
, XFS_ITRUNCATE_LOG_COUNT
))) {
381 ASSERT(XFS_FORCED_SHUTDOWN(mp
));
385 * Return with the inode locked but not joined to the transaction.
391 xfs_bmap_cancel(&free_list
);
394 * Have to come here with the inode locked and either
395 * (held and in the transaction) or (not in the transaction).
396 * If the inode isn't held then cancel would iput it, but
397 * that's wrong since this is inactive and the vnode ref
398 * count is 0 already.
399 * Cancel won't do anything to the inode if held, but it still
400 * needs to be locked until the cancel is done, if it was
401 * joined to the transaction.
403 xfs_trans_cancel(tp
, XFS_TRANS_RELEASE_LOG_RES
| XFS_TRANS_ABORT
);
404 xfs_iunlock(ip
, XFS_IOLOCK_EXCL
| XFS_ILOCK_EXCL
);
411 xfs_inactive_symlink_local(
417 ASSERT(ip
->i_d
.di_size
<= XFS_IFORK_DSIZE(ip
));
419 * We're freeing a symlink which fit into
420 * the inode. Just free the memory used
421 * to hold the old symlink.
423 error
= xfs_trans_reserve(*tpp
, 0,
424 XFS_ITRUNCATE_LOG_RES(ip
->i_mount
),
425 0, XFS_TRANS_PERM_LOG_RES
,
426 XFS_ITRUNCATE_LOG_COUNT
);
429 xfs_trans_cancel(*tpp
, 0);
433 xfs_ilock(ip
, XFS_ILOCK_EXCL
| XFS_IOLOCK_EXCL
);
436 * Zero length symlinks _can_ exist.
438 if (ip
->i_df
.if_bytes
> 0) {
439 xfs_idata_realloc(ip
,
440 -(ip
->i_df
.if_bytes
),
442 ASSERT(ip
->i_df
.if_bytes
== 0);
456 ASSERT(xfs_isilocked(ip
, XFS_IOLOCK_EXCL
));
459 ASSERT(ip
->i_d
.di_forkoff
!= 0);
460 error
= xfs_trans_commit(tp
, XFS_TRANS_RELEASE_LOG_RES
);
461 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
465 error
= xfs_attr_inactive(ip
);
469 tp
= xfs_trans_alloc(mp
, XFS_TRANS_INACTIVE
);
470 error
= xfs_trans_reserve(tp
, 0,
471 XFS_IFREE_LOG_RES(mp
),
472 0, XFS_TRANS_PERM_LOG_RES
,
473 XFS_INACTIVE_LOG_COUNT
);
477 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
478 xfs_trans_ijoin(tp
, ip
, 0);
479 xfs_idestroy_fork(ip
, XFS_ATTR_FORK
);
481 ASSERT(ip
->i_d
.di_anextents
== 0);
487 ASSERT(XFS_FORCED_SHUTDOWN(mp
));
488 xfs_trans_cancel(tp
, 0);
491 xfs_iunlock(ip
, XFS_IOLOCK_EXCL
);
499 xfs_mount_t
*mp
= ip
->i_mount
;
502 if (!S_ISREG(ip
->i_d
.di_mode
) || (ip
->i_d
.di_mode
== 0))
505 /* If this is a read-only mount, don't do this (would generate I/O) */
506 if (mp
->m_flags
& XFS_MOUNT_RDONLY
)
509 if (!XFS_FORCED_SHUTDOWN(mp
)) {
513 * If we are using filestreams, and we have an unlinked
514 * file that we are processing the last close on, then nothing
515 * will be able to reopen and write to this file. Purge this
516 * inode from the filestreams cache so that it doesn't delay
517 * teardown of the inode.
519 if ((ip
->i_d
.di_nlink
== 0) && xfs_inode_is_filestream(ip
))
520 xfs_filestream_deassociate(ip
);
523 * If we previously truncated this file and removed old data
524 * in the process, we want to initiate "early" writeout on
525 * the last close. This is an attempt to combat the notorious
526 * NULL files problem which is particularly noticeable from a
527 * truncate down, buffered (re-)write (delalloc), followed by
528 * a crash. What we are effectively doing here is
529 * significantly reducing the time window where we'd otherwise
530 * be exposed to that problem.
532 truncated
= xfs_iflags_test_and_clear(ip
, XFS_ITRUNCATED
);
534 xfs_iflags_clear(ip
, XFS_IDIRTY_RELEASE
);
535 if (VN_DIRTY(VFS_I(ip
)) && ip
->i_delayed_blks
> 0)
536 xfs_flush_pages(ip
, 0, -1, XBF_ASYNC
, FI_NONE
);
540 if (ip
->i_d
.di_nlink
== 0)
543 if ((S_ISREG(ip
->i_d
.di_mode
) &&
544 ((ip
->i_size
> 0) || (VN_CACHED(VFS_I(ip
)) > 0 ||
545 ip
->i_delayed_blks
> 0)) &&
546 (ip
->i_df
.if_flags
& XFS_IFEXTENTS
)) &&
547 (!(ip
->i_d
.di_flags
& (XFS_DIFLAG_PREALLOC
| XFS_DIFLAG_APPEND
)))) {
550 * If we can't get the iolock just skip truncating the blocks
551 * past EOF because we could deadlock with the mmap_sem
552 * otherwise. We'll get another chance to drop them once the
553 * last reference to the inode is dropped, so we'll never leak
554 * blocks permanently.
556 * Further, check if the inode is being opened, written and
557 * closed frequently and we have delayed allocation blocks
558 * outstanding (e.g. streaming writes from the NFS server),
559 * truncating the blocks past EOF will cause fragmentation to
562 * In this case don't do the truncation, either, but we have to
563 * be careful how we detect this case. Blocks beyond EOF show
564 * up as i_delayed_blks even when the inode is clean, so we
565 * need to truncate them away first before checking for a dirty
566 * release. Hence on the first dirty close we will still remove
567 * the speculative allocation, but after that we will leave it
570 if (xfs_iflags_test(ip
, XFS_IDIRTY_RELEASE
))
573 error
= xfs_free_eofblocks(mp
, ip
,
574 XFS_FREE_EOF_TRYLOCK
);
578 /* delalloc blocks after truncation means it really is dirty */
579 if (ip
->i_delayed_blks
)
580 xfs_iflags_set(ip
, XFS_IDIRTY_RELEASE
);
588 * This is called when the vnode reference count for the vnode
589 * goes to zero. If the file has been unlinked, then it must
590 * now be truncated. Also, we clear all of the read-ahead state
591 * kept for the inode here since the file is now closed.
597 xfs_bmap_free_t free_list
;
598 xfs_fsblock_t first_block
;
606 * If the inode is already free, then there can be nothing
609 if (ip
->i_d
.di_mode
== 0 || is_bad_inode(VFS_I(ip
))) {
610 ASSERT(ip
->i_df
.if_real_bytes
== 0);
611 ASSERT(ip
->i_df
.if_broot_bytes
== 0);
612 return VN_INACTIVE_CACHE
;
616 * Only do a truncate if it's a regular file with
617 * some actual space in it. It's OK to look at the
618 * inode's fields without the lock because we're the
619 * only one with a reference to the inode.
621 truncate
= ((ip
->i_d
.di_nlink
== 0) &&
622 ((ip
->i_d
.di_size
!= 0) || (ip
->i_size
!= 0) ||
623 (ip
->i_d
.di_nextents
> 0) || (ip
->i_delayed_blks
> 0)) &&
624 S_ISREG(ip
->i_d
.di_mode
));
630 /* If this is a read-only mount, don't do this (would generate I/O) */
631 if (mp
->m_flags
& XFS_MOUNT_RDONLY
)
634 if (ip
->i_d
.di_nlink
!= 0) {
635 if ((S_ISREG(ip
->i_d
.di_mode
) &&
636 ((ip
->i_size
> 0) || (VN_CACHED(VFS_I(ip
)) > 0 ||
637 ip
->i_delayed_blks
> 0)) &&
638 (ip
->i_df
.if_flags
& XFS_IFEXTENTS
) &&
639 (!(ip
->i_d
.di_flags
&
640 (XFS_DIFLAG_PREALLOC
| XFS_DIFLAG_APPEND
)) ||
641 (ip
->i_delayed_blks
!= 0)))) {
642 error
= xfs_free_eofblocks(mp
, ip
, 0);
644 return VN_INACTIVE_CACHE
;
649 ASSERT(ip
->i_d
.di_nlink
== 0);
651 error
= xfs_qm_dqattach(ip
, 0);
653 return VN_INACTIVE_CACHE
;
655 tp
= xfs_trans_alloc(mp
, XFS_TRANS_INACTIVE
);
657 xfs_ilock(ip
, XFS_IOLOCK_EXCL
);
659 error
= xfs_trans_reserve(tp
, 0,
660 XFS_ITRUNCATE_LOG_RES(mp
),
661 0, XFS_TRANS_PERM_LOG_RES
,
662 XFS_ITRUNCATE_LOG_COUNT
);
664 /* Don't call itruncate_cleanup */
665 ASSERT(XFS_FORCED_SHUTDOWN(mp
));
666 xfs_trans_cancel(tp
, 0);
667 xfs_iunlock(ip
, XFS_IOLOCK_EXCL
);
668 return VN_INACTIVE_CACHE
;
671 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
672 xfs_trans_ijoin(tp
, ip
, 0);
674 error
= xfs_itruncate_data(&tp
, ip
, 0);
677 XFS_TRANS_RELEASE_LOG_RES
| XFS_TRANS_ABORT
);
678 xfs_iunlock(ip
, XFS_IOLOCK_EXCL
| XFS_ILOCK_EXCL
);
679 return VN_INACTIVE_CACHE
;
681 } else if (S_ISLNK(ip
->i_d
.di_mode
)) {
684 * If we get an error while cleaning up a
685 * symlink we bail out.
687 error
= (ip
->i_d
.di_size
> XFS_IFORK_DSIZE(ip
)) ?
688 xfs_inactive_symlink_rmt(ip
, &tp
) :
689 xfs_inactive_symlink_local(ip
, &tp
);
693 return VN_INACTIVE_CACHE
;
696 xfs_trans_ijoin(tp
, ip
, 0);
698 error
= xfs_trans_reserve(tp
, 0,
699 XFS_IFREE_LOG_RES(mp
),
700 0, XFS_TRANS_PERM_LOG_RES
,
701 XFS_INACTIVE_LOG_COUNT
);
703 ASSERT(XFS_FORCED_SHUTDOWN(mp
));
704 xfs_trans_cancel(tp
, 0);
705 return VN_INACTIVE_CACHE
;
708 xfs_ilock(ip
, XFS_ILOCK_EXCL
| XFS_IOLOCK_EXCL
);
709 xfs_trans_ijoin(tp
, ip
, 0);
713 * If there are attributes associated with the file
714 * then blow them away now. The code calls a routine
715 * that recursively deconstructs the attribute fork.
716 * We need to just commit the current transaction
717 * because we can't use it for xfs_attr_inactive().
719 if (ip
->i_d
.di_anextents
> 0) {
720 error
= xfs_inactive_attrs(ip
, &tp
);
722 * If we got an error, the transaction is already
723 * cancelled, and the inode is unlocked. Just get out.
726 return VN_INACTIVE_CACHE
;
727 } else if (ip
->i_afp
) {
728 xfs_idestroy_fork(ip
, XFS_ATTR_FORK
);
734 xfs_bmap_init(&free_list
, &first_block
);
735 error
= xfs_ifree(tp
, ip
, &free_list
);
738 * If we fail to free the inode, shut down. The cancel
739 * might do that, we need to make sure. Otherwise the
740 * inode might be lost for a long time or forever.
742 if (!XFS_FORCED_SHUTDOWN(mp
)) {
743 xfs_notice(mp
, "%s: xfs_ifree returned error %d",
745 xfs_force_shutdown(mp
, SHUTDOWN_META_IO_ERROR
);
747 xfs_trans_cancel(tp
, XFS_TRANS_RELEASE_LOG_RES
|XFS_TRANS_ABORT
);
750 * Credit the quota account(s). The inode is gone.
752 xfs_trans_mod_dquot_byino(tp
, ip
, XFS_TRANS_DQ_ICOUNT
, -1);
755 * Just ignore errors at this point. There is nothing we can
756 * do except to try to keep going. Make sure it's not a silent
759 error
= xfs_bmap_finish(&tp
, &free_list
, &committed
);
761 xfs_notice(mp
, "%s: xfs_bmap_finish returned error %d",
763 error
= xfs_trans_commit(tp
, XFS_TRANS_RELEASE_LOG_RES
);
765 xfs_notice(mp
, "%s: xfs_trans_commit returned error %d",
770 * Release the dquots held by inode, if any.
773 xfs_iunlock(ip
, XFS_IOLOCK_EXCL
| XFS_ILOCK_EXCL
);
776 return VN_INACTIVE_CACHE
;
780 * Lookups up an inode from "name". If ci_name is not NULL, then a CI match
781 * is allowed, otherwise it has to be an exact match. If a CI match is found,
782 * ci_name->name will point to a the actual name (caller must free) or
783 * will be set to NULL if an exact match is found.
788 struct xfs_name
*name
,
790 struct xfs_name
*ci_name
)
796 trace_xfs_lookup(dp
, name
);
798 if (XFS_FORCED_SHUTDOWN(dp
->i_mount
))
799 return XFS_ERROR(EIO
);
801 lock_mode
= xfs_ilock_map_shared(dp
);
802 error
= xfs_dir_lookup(NULL
, dp
, name
, &inum
, ci_name
);
803 xfs_iunlock_map_shared(dp
, lock_mode
);
808 error
= xfs_iget(dp
->i_mount
, NULL
, inum
, 0, 0, ipp
);
816 kmem_free(ci_name
->name
);
825 struct xfs_name
*name
,
830 int is_dir
= S_ISDIR(mode
);
831 struct xfs_mount
*mp
= dp
->i_mount
;
832 struct xfs_inode
*ip
= NULL
;
833 struct xfs_trans
*tp
= NULL
;
835 xfs_bmap_free_t free_list
;
836 xfs_fsblock_t first_block
;
837 boolean_t unlock_dp_on_error
= B_FALSE
;
841 struct xfs_dquot
*udqp
= NULL
;
842 struct xfs_dquot
*gdqp
= NULL
;
847 trace_xfs_create(dp
, name
);
849 if (XFS_FORCED_SHUTDOWN(mp
))
850 return XFS_ERROR(EIO
);
852 if (dp
->i_d
.di_flags
& XFS_DIFLAG_PROJINHERIT
)
853 prid
= xfs_get_projid(dp
);
855 prid
= XFS_PROJID_DEFAULT
;
858 * Make sure that we have allocated dquot(s) on disk.
860 error
= xfs_qm_vop_dqalloc(dp
, current_fsuid(), current_fsgid(), prid
,
861 XFS_QMOPT_QUOTALL
| XFS_QMOPT_INHERIT
, &udqp
, &gdqp
);
867 resblks
= XFS_MKDIR_SPACE_RES(mp
, name
->len
);
868 log_res
= XFS_MKDIR_LOG_RES(mp
);
869 log_count
= XFS_MKDIR_LOG_COUNT
;
870 tp
= xfs_trans_alloc(mp
, XFS_TRANS_MKDIR
);
872 resblks
= XFS_CREATE_SPACE_RES(mp
, name
->len
);
873 log_res
= XFS_CREATE_LOG_RES(mp
);
874 log_count
= XFS_CREATE_LOG_COUNT
;
875 tp
= xfs_trans_alloc(mp
, XFS_TRANS_CREATE
);
878 cancel_flags
= XFS_TRANS_RELEASE_LOG_RES
;
881 * Initially assume that the file does not exist and
882 * reserve the resources for that case. If that is not
883 * the case we'll drop the one we have and get a more
884 * appropriate transaction later.
886 error
= xfs_trans_reserve(tp
, resblks
, log_res
, 0,
887 XFS_TRANS_PERM_LOG_RES
, log_count
);
888 if (error
== ENOSPC
) {
889 /* flush outstanding delalloc blocks and retry */
890 xfs_flush_inodes(dp
);
891 error
= xfs_trans_reserve(tp
, resblks
, log_res
, 0,
892 XFS_TRANS_PERM_LOG_RES
, log_count
);
894 if (error
== ENOSPC
) {
895 /* No space at all so try a "no-allocation" reservation */
897 error
= xfs_trans_reserve(tp
, 0, log_res
, 0,
898 XFS_TRANS_PERM_LOG_RES
, log_count
);
902 goto out_trans_cancel
;
905 xfs_ilock(dp
, XFS_ILOCK_EXCL
| XFS_ILOCK_PARENT
);
906 unlock_dp_on_error
= B_TRUE
;
909 * Check for directory link count overflow.
911 if (is_dir
&& dp
->i_d
.di_nlink
>= XFS_MAXLINK
) {
912 error
= XFS_ERROR(EMLINK
);
913 goto out_trans_cancel
;
916 xfs_bmap_init(&free_list
, &first_block
);
919 * Reserve disk quota and the inode.
921 error
= xfs_trans_reserve_quota(tp
, mp
, udqp
, gdqp
, resblks
, 1, 0);
923 goto out_trans_cancel
;
925 error
= xfs_dir_canenter(tp
, dp
, name
, resblks
);
927 goto out_trans_cancel
;
930 * A newly created regular or special file just has one directory
931 * entry pointing to them, but a directory also the "." entry
932 * pointing to itself.
934 error
= xfs_dir_ialloc(&tp
, dp
, mode
, is_dir
? 2 : 1, rdev
,
935 prid
, resblks
> 0, &ip
, &committed
);
938 goto out_trans_cancel
;
939 goto out_trans_abort
;
943 * Now we join the directory inode to the transaction. We do not do it
944 * earlier because xfs_dir_ialloc might commit the previous transaction
945 * (and release all the locks). An error from here on will result in
946 * the transaction cancel unlocking dp so don't do it explicitly in the
949 xfs_trans_ijoin(tp
, dp
, XFS_ILOCK_EXCL
);
950 unlock_dp_on_error
= B_FALSE
;
952 error
= xfs_dir_createname(tp
, dp
, name
, ip
->i_ino
,
953 &first_block
, &free_list
, resblks
?
954 resblks
- XFS_IALLOC_SPACE_RES(mp
) : 0);
956 ASSERT(error
!= ENOSPC
);
957 goto out_trans_abort
;
959 xfs_trans_ichgtime(tp
, dp
, XFS_ICHGTIME_MOD
| XFS_ICHGTIME_CHG
);
960 xfs_trans_log_inode(tp
, dp
, XFS_ILOG_CORE
);
963 error
= xfs_dir_init(tp
, ip
, dp
);
965 goto out_bmap_cancel
;
967 error
= xfs_bumplink(tp
, dp
);
969 goto out_bmap_cancel
;
973 * If this is a synchronous mount, make sure that the
974 * create transaction goes to disk before returning to
977 if (mp
->m_flags
& (XFS_MOUNT_WSYNC
|XFS_MOUNT_DIRSYNC
))
978 xfs_trans_set_sync(tp
);
981 * Attach the dquot(s) to the inodes and modify them incore.
982 * These ids of the inode couldn't have changed since the new
983 * inode has been locked ever since it was created.
985 xfs_qm_vop_create_dqattach(tp
, ip
, udqp
, gdqp
);
987 error
= xfs_bmap_finish(&tp
, &free_list
, &committed
);
989 goto out_bmap_cancel
;
991 error
= xfs_trans_commit(tp
, XFS_TRANS_RELEASE_LOG_RES
);
993 goto out_release_inode
;
1002 xfs_bmap_cancel(&free_list
);
1004 cancel_flags
|= XFS_TRANS_ABORT
;
1006 xfs_trans_cancel(tp
, cancel_flags
);
1009 * Wait until after the current transaction is aborted to
1010 * release the inode. This prevents recursive transactions
1011 * and deadlocks from xfs_inactive.
1016 xfs_qm_dqrele(udqp
);
1017 xfs_qm_dqrele(gdqp
);
1019 if (unlock_dp_on_error
)
1020 xfs_iunlock(dp
, XFS_ILOCK_EXCL
);
1026 int xfs_small_retries
;
1027 int xfs_middle_retries
;
1028 int xfs_lots_retries
;
1029 int xfs_lock_delays
;
1033 * Bump the subclass so xfs_lock_inodes() acquires each lock with
1037 xfs_lock_inumorder(int lock_mode
, int subclass
)
1039 if (lock_mode
& (XFS_IOLOCK_SHARED
|XFS_IOLOCK_EXCL
))
1040 lock_mode
|= (subclass
+ XFS_LOCK_INUMORDER
) << XFS_IOLOCK_SHIFT
;
1041 if (lock_mode
& (XFS_ILOCK_SHARED
|XFS_ILOCK_EXCL
))
1042 lock_mode
|= (subclass
+ XFS_LOCK_INUMORDER
) << XFS_ILOCK_SHIFT
;
1048 * The following routine will lock n inodes in exclusive mode.
1049 * We assume the caller calls us with the inodes in i_ino order.
1051 * We need to detect deadlock where an inode that we lock
1052 * is in the AIL and we start waiting for another inode that is locked
1053 * by a thread in a long running transaction (such as truncate). This can
1054 * result in deadlock since the long running trans might need to wait
1055 * for the inode we just locked in order to push the tail and free space
1064 int attempts
= 0, i
, j
, try_lock
;
1067 ASSERT(ips
&& (inodes
>= 2)); /* we need at least two */
1073 for (; i
< inodes
; i
++) {
1076 if (i
&& (ips
[i
] == ips
[i
-1])) /* Already locked */
1080 * If try_lock is not set yet, make sure all locked inodes
1081 * are not in the AIL.
1082 * If any are, set try_lock to be used later.
1086 for (j
= (i
- 1); j
>= 0 && !try_lock
; j
--) {
1087 lp
= (xfs_log_item_t
*)ips
[j
]->i_itemp
;
1088 if (lp
&& (lp
->li_flags
& XFS_LI_IN_AIL
)) {
1095 * If any of the previous locks we have locked is in the AIL,
1096 * we must TRY to get the second and subsequent locks. If
1097 * we can't get any, we must release all we have
1102 /* try_lock must be 0 if i is 0. */
1104 * try_lock means we have an inode locked
1105 * that is in the AIL.
1108 if (!xfs_ilock_nowait(ips
[i
], xfs_lock_inumorder(lock_mode
, i
))) {
1112 * Unlock all previous guys and try again.
1113 * xfs_iunlock will try to push the tail
1114 * if the inode is in the AIL.
1117 for(j
= i
- 1; j
>= 0; j
--) {
1120 * Check to see if we've already
1121 * unlocked this one.
1122 * Not the first one going back,
1123 * and the inode ptr is the same.
1125 if ((j
!= (i
- 1)) && ips
[j
] ==
1129 xfs_iunlock(ips
[j
], lock_mode
);
1132 if ((attempts
% 5) == 0) {
1133 delay(1); /* Don't just spin the CPU */
1143 xfs_ilock(ips
[i
], xfs_lock_inumorder(lock_mode
, i
));
1149 if (attempts
< 5) xfs_small_retries
++;
1150 else if (attempts
< 100) xfs_middle_retries
++;
1151 else xfs_lots_retries
++;
1159 * xfs_lock_two_inodes() can only be used to lock one type of lock
1160 * at a time - the iolock or the ilock, but not both at once. If
1161 * we lock both at once, lockdep will report false positives saying
1162 * we have violated locking orders.
1165 xfs_lock_two_inodes(
1174 if (lock_mode
& (XFS_IOLOCK_SHARED
|XFS_IOLOCK_EXCL
))
1175 ASSERT((lock_mode
& (XFS_ILOCK_SHARED
|XFS_ILOCK_EXCL
)) == 0);
1176 ASSERT(ip0
->i_ino
!= ip1
->i_ino
);
1178 if (ip0
->i_ino
> ip1
->i_ino
) {
1185 xfs_ilock(ip0
, xfs_lock_inumorder(lock_mode
, 0));
1188 * If the first lock we have locked is in the AIL, we must TRY to get
1189 * the second lock. If we can't get it, we must release the first one
1192 lp
= (xfs_log_item_t
*)ip0
->i_itemp
;
1193 if (lp
&& (lp
->li_flags
& XFS_LI_IN_AIL
)) {
1194 if (!xfs_ilock_nowait(ip1
, xfs_lock_inumorder(lock_mode
, 1))) {
1195 xfs_iunlock(ip0
, lock_mode
);
1196 if ((++attempts
% 5) == 0)
1197 delay(1); /* Don't just spin the CPU */
1201 xfs_ilock(ip1
, xfs_lock_inumorder(lock_mode
, 1));
1208 struct xfs_name
*name
,
1211 xfs_mount_t
*mp
= dp
->i_mount
;
1212 xfs_trans_t
*tp
= NULL
;
1213 int is_dir
= S_ISDIR(ip
->i_d
.di_mode
);
1215 xfs_bmap_free_t free_list
;
1216 xfs_fsblock_t first_block
;
1223 trace_xfs_remove(dp
, name
);
1225 if (XFS_FORCED_SHUTDOWN(mp
))
1226 return XFS_ERROR(EIO
);
1228 error
= xfs_qm_dqattach(dp
, 0);
1232 error
= xfs_qm_dqattach(ip
, 0);
1237 tp
= xfs_trans_alloc(mp
, XFS_TRANS_RMDIR
);
1238 log_count
= XFS_DEFAULT_LOG_COUNT
;
1240 tp
= xfs_trans_alloc(mp
, XFS_TRANS_REMOVE
);
1241 log_count
= XFS_REMOVE_LOG_COUNT
;
1243 cancel_flags
= XFS_TRANS_RELEASE_LOG_RES
;
1246 * We try to get the real space reservation first,
1247 * allowing for directory btree deletion(s) implying
1248 * possible bmap insert(s). If we can't get the space
1249 * reservation then we use 0 instead, and avoid the bmap
1250 * btree insert(s) in the directory code by, if the bmap
1251 * insert tries to happen, instead trimming the LAST
1252 * block from the directory.
1254 resblks
= XFS_REMOVE_SPACE_RES(mp
);
1255 error
= xfs_trans_reserve(tp
, resblks
, XFS_REMOVE_LOG_RES(mp
), 0,
1256 XFS_TRANS_PERM_LOG_RES
, log_count
);
1257 if (error
== ENOSPC
) {
1259 error
= xfs_trans_reserve(tp
, 0, XFS_REMOVE_LOG_RES(mp
), 0,
1260 XFS_TRANS_PERM_LOG_RES
, log_count
);
1263 ASSERT(error
!= ENOSPC
);
1265 goto out_trans_cancel
;
1268 xfs_lock_two_inodes(dp
, ip
, XFS_ILOCK_EXCL
);
1270 xfs_trans_ijoin(tp
, dp
, XFS_ILOCK_EXCL
);
1271 xfs_trans_ijoin(tp
, ip
, XFS_ILOCK_EXCL
);
1274 * If we're removing a directory perform some additional validation.
1277 ASSERT(ip
->i_d
.di_nlink
>= 2);
1278 if (ip
->i_d
.di_nlink
!= 2) {
1279 error
= XFS_ERROR(ENOTEMPTY
);
1280 goto out_trans_cancel
;
1282 if (!xfs_dir_isempty(ip
)) {
1283 error
= XFS_ERROR(ENOTEMPTY
);
1284 goto out_trans_cancel
;
1288 xfs_bmap_init(&free_list
, &first_block
);
1289 error
= xfs_dir_removename(tp
, dp
, name
, ip
->i_ino
,
1290 &first_block
, &free_list
, resblks
);
1292 ASSERT(error
!= ENOENT
);
1293 goto out_bmap_cancel
;
1295 xfs_trans_ichgtime(tp
, dp
, XFS_ICHGTIME_MOD
| XFS_ICHGTIME_CHG
);
1299 * Drop the link from ip's "..".
1301 error
= xfs_droplink(tp
, dp
);
1303 goto out_bmap_cancel
;
1306 * Drop the "." link from ip to self.
1308 error
= xfs_droplink(tp
, ip
);
1310 goto out_bmap_cancel
;
1313 * When removing a non-directory we need to log the parent
1314 * inode here. For a directory this is done implicitly
1315 * by the xfs_droplink call for the ".." entry.
1317 xfs_trans_log_inode(tp
, dp
, XFS_ILOG_CORE
);
1321 * Drop the link from dp to ip.
1323 error
= xfs_droplink(tp
, ip
);
1325 goto out_bmap_cancel
;
1328 * Determine if this is the last link while
1329 * we are in the transaction.
1331 link_zero
= (ip
->i_d
.di_nlink
== 0);
1334 * If this is a synchronous mount, make sure that the
1335 * remove transaction goes to disk before returning to
1338 if (mp
->m_flags
& (XFS_MOUNT_WSYNC
|XFS_MOUNT_DIRSYNC
))
1339 xfs_trans_set_sync(tp
);
1341 error
= xfs_bmap_finish(&tp
, &free_list
, &committed
);
1343 goto out_bmap_cancel
;
1345 error
= xfs_trans_commit(tp
, XFS_TRANS_RELEASE_LOG_RES
);
1350 * If we are using filestreams, kill the stream association.
1351 * If the file is still open it may get a new one but that
1352 * will get killed on last close in xfs_close() so we don't
1353 * have to worry about that.
1355 if (!is_dir
&& link_zero
&& xfs_inode_is_filestream(ip
))
1356 xfs_filestream_deassociate(ip
);
1361 xfs_bmap_cancel(&free_list
);
1362 cancel_flags
|= XFS_TRANS_ABORT
;
1364 xfs_trans_cancel(tp
, cancel_flags
);
1373 struct xfs_name
*target_name
)
1375 xfs_mount_t
*mp
= tdp
->i_mount
;
1378 xfs_bmap_free_t free_list
;
1379 xfs_fsblock_t first_block
;
1384 trace_xfs_link(tdp
, target_name
);
1386 ASSERT(!S_ISDIR(sip
->i_d
.di_mode
));
1388 if (XFS_FORCED_SHUTDOWN(mp
))
1389 return XFS_ERROR(EIO
);
1391 error
= xfs_qm_dqattach(sip
, 0);
1395 error
= xfs_qm_dqattach(tdp
, 0);
1399 tp
= xfs_trans_alloc(mp
, XFS_TRANS_LINK
);
1400 cancel_flags
= XFS_TRANS_RELEASE_LOG_RES
;
1401 resblks
= XFS_LINK_SPACE_RES(mp
, target_name
->len
);
1402 error
= xfs_trans_reserve(tp
, resblks
, XFS_LINK_LOG_RES(mp
), 0,
1403 XFS_TRANS_PERM_LOG_RES
, XFS_LINK_LOG_COUNT
);
1404 if (error
== ENOSPC
) {
1406 error
= xfs_trans_reserve(tp
, 0, XFS_LINK_LOG_RES(mp
), 0,
1407 XFS_TRANS_PERM_LOG_RES
, XFS_LINK_LOG_COUNT
);
1414 xfs_lock_two_inodes(sip
, tdp
, XFS_ILOCK_EXCL
);
1416 xfs_trans_ijoin(tp
, sip
, XFS_ILOCK_EXCL
);
1417 xfs_trans_ijoin(tp
, tdp
, XFS_ILOCK_EXCL
);
1420 * If the source has too many links, we can't make any more to it.
1422 if (sip
->i_d
.di_nlink
>= XFS_MAXLINK
) {
1423 error
= XFS_ERROR(EMLINK
);
1428 * If we are using project inheritance, we only allow hard link
1429 * creation in our tree when the project IDs are the same; else
1430 * the tree quota mechanism could be circumvented.
1432 if (unlikely((tdp
->i_d
.di_flags
& XFS_DIFLAG_PROJINHERIT
) &&
1433 (xfs_get_projid(tdp
) != xfs_get_projid(sip
)))) {
1434 error
= XFS_ERROR(EXDEV
);
1438 error
= xfs_dir_canenter(tp
, tdp
, target_name
, resblks
);
1442 xfs_bmap_init(&free_list
, &first_block
);
1444 error
= xfs_dir_createname(tp
, tdp
, target_name
, sip
->i_ino
,
1445 &first_block
, &free_list
, resblks
);
1448 xfs_trans_ichgtime(tp
, tdp
, XFS_ICHGTIME_MOD
| XFS_ICHGTIME_CHG
);
1449 xfs_trans_log_inode(tp
, tdp
, XFS_ILOG_CORE
);
1451 error
= xfs_bumplink(tp
, sip
);
1456 * If this is a synchronous mount, make sure that the
1457 * link transaction goes to disk before returning to
1460 if (mp
->m_flags
& (XFS_MOUNT_WSYNC
|XFS_MOUNT_DIRSYNC
)) {
1461 xfs_trans_set_sync(tp
);
1464 error
= xfs_bmap_finish (&tp
, &free_list
, &committed
);
1466 xfs_bmap_cancel(&free_list
);
1470 return xfs_trans_commit(tp
, XFS_TRANS_RELEASE_LOG_RES
);
1473 cancel_flags
|= XFS_TRANS_ABORT
;
1475 xfs_trans_cancel(tp
, cancel_flags
);
1483 struct xfs_name
*link_name
,
1484 const char *target_path
,
1488 xfs_mount_t
*mp
= dp
->i_mount
;
1493 xfs_bmap_free_t free_list
;
1494 xfs_fsblock_t first_block
;
1495 boolean_t unlock_dp_on_error
= B_FALSE
;
1498 xfs_fileoff_t first_fsb
;
1499 xfs_filblks_t fs_blocks
;
1501 xfs_bmbt_irec_t mval
[SYMLINK_MAPS
];
1503 const char *cur_chunk
;
1508 struct xfs_dquot
*udqp
, *gdqp
;
1516 trace_xfs_symlink(dp
, link_name
);
1518 if (XFS_FORCED_SHUTDOWN(mp
))
1519 return XFS_ERROR(EIO
);
1522 * Check component lengths of the target path name.
1524 pathlen
= strlen(target_path
);
1525 if (pathlen
>= MAXPATHLEN
) /* total string too long */
1526 return XFS_ERROR(ENAMETOOLONG
);
1529 if (dp
->i_d
.di_flags
& XFS_DIFLAG_PROJINHERIT
)
1530 prid
= xfs_get_projid(dp
);
1532 prid
= XFS_PROJID_DEFAULT
;
1535 * Make sure that we have allocated dquot(s) on disk.
1537 error
= xfs_qm_vop_dqalloc(dp
, current_fsuid(), current_fsgid(), prid
,
1538 XFS_QMOPT_QUOTALL
| XFS_QMOPT_INHERIT
, &udqp
, &gdqp
);
1542 tp
= xfs_trans_alloc(mp
, XFS_TRANS_SYMLINK
);
1543 cancel_flags
= XFS_TRANS_RELEASE_LOG_RES
;
1545 * The symlink will fit into the inode data fork?
1546 * There can't be any attributes so we get the whole variable part.
1548 if (pathlen
<= XFS_LITINO(mp
))
1551 fs_blocks
= XFS_B_TO_FSB(mp
, pathlen
);
1552 resblks
= XFS_SYMLINK_SPACE_RES(mp
, link_name
->len
, fs_blocks
);
1553 error
= xfs_trans_reserve(tp
, resblks
, XFS_SYMLINK_LOG_RES(mp
), 0,
1554 XFS_TRANS_PERM_LOG_RES
, XFS_SYMLINK_LOG_COUNT
);
1555 if (error
== ENOSPC
&& fs_blocks
== 0) {
1557 error
= xfs_trans_reserve(tp
, 0, XFS_SYMLINK_LOG_RES(mp
), 0,
1558 XFS_TRANS_PERM_LOG_RES
, XFS_SYMLINK_LOG_COUNT
);
1565 xfs_ilock(dp
, XFS_ILOCK_EXCL
| XFS_ILOCK_PARENT
);
1566 unlock_dp_on_error
= B_TRUE
;
1569 * Check whether the directory allows new symlinks or not.
1571 if (dp
->i_d
.di_flags
& XFS_DIFLAG_NOSYMLINKS
) {
1572 error
= XFS_ERROR(EPERM
);
1577 * Reserve disk quota : blocks and inode.
1579 error
= xfs_trans_reserve_quota(tp
, mp
, udqp
, gdqp
, resblks
, 1, 0);
1584 * Check for ability to enter directory entry, if no space reserved.
1586 error
= xfs_dir_canenter(tp
, dp
, link_name
, resblks
);
1590 * Initialize the bmap freelist prior to calling either
1591 * bmapi or the directory create code.
1593 xfs_bmap_init(&free_list
, &first_block
);
1596 * Allocate an inode for the symlink.
1598 error
= xfs_dir_ialloc(&tp
, dp
, S_IFLNK
| (mode
& ~S_IFMT
), 1, 0,
1599 prid
, resblks
> 0, &ip
, NULL
);
1601 if (error
== ENOSPC
)
1607 * An error after we've joined dp to the transaction will result in the
1608 * transaction cancel unlocking dp so don't do it explicitly in the
1611 xfs_trans_ijoin(tp
, dp
, XFS_ILOCK_EXCL
);
1612 unlock_dp_on_error
= B_FALSE
;
1615 * Also attach the dquot(s) to it, if applicable.
1617 xfs_qm_vop_create_dqattach(tp
, ip
, udqp
, gdqp
);
1620 resblks
-= XFS_IALLOC_SPACE_RES(mp
);
1622 * If the symlink will fit into the inode, write it inline.
1624 if (pathlen
<= XFS_IFORK_DSIZE(ip
)) {
1625 xfs_idata_realloc(ip
, pathlen
, XFS_DATA_FORK
);
1626 memcpy(ip
->i_df
.if_u1
.if_data
, target_path
, pathlen
);
1627 ip
->i_d
.di_size
= pathlen
;
1630 * The inode was initially created in extent format.
1632 ip
->i_df
.if_flags
&= ~(XFS_IFEXTENTS
| XFS_IFBROOT
);
1633 ip
->i_df
.if_flags
|= XFS_IFINLINE
;
1635 ip
->i_d
.di_format
= XFS_DINODE_FMT_LOCAL
;
1636 xfs_trans_log_inode(tp
, ip
, XFS_ILOG_DDATA
| XFS_ILOG_CORE
);
1640 nmaps
= SYMLINK_MAPS
;
1642 error
= xfs_bmapi_write(tp
, ip
, first_fsb
, fs_blocks
,
1643 XFS_BMAPI_METADATA
, &first_block
, resblks
,
1644 mval
, &nmaps
, &free_list
);
1649 resblks
-= fs_blocks
;
1650 ip
->i_d
.di_size
= pathlen
;
1651 xfs_trans_log_inode(tp
, ip
, XFS_ILOG_CORE
);
1653 cur_chunk
= target_path
;
1654 for (n
= 0; n
< nmaps
; n
++) {
1655 d
= XFS_FSB_TO_DADDR(mp
, mval
[n
].br_startblock
);
1656 byte_cnt
= XFS_FSB_TO_B(mp
, mval
[n
].br_blockcount
);
1657 bp
= xfs_trans_get_buf(tp
, mp
->m_ddev_targp
, d
,
1658 BTOBB(byte_cnt
), 0);
1663 if (pathlen
< byte_cnt
) {
1666 pathlen
-= byte_cnt
;
1668 memcpy(bp
->b_addr
, cur_chunk
, byte_cnt
);
1669 cur_chunk
+= byte_cnt
;
1671 xfs_trans_log_buf(tp
, bp
, 0, byte_cnt
- 1);
1676 * Create the directory entry for the symlink.
1678 error
= xfs_dir_createname(tp
, dp
, link_name
, ip
->i_ino
,
1679 &first_block
, &free_list
, resblks
);
1682 xfs_trans_ichgtime(tp
, dp
, XFS_ICHGTIME_MOD
| XFS_ICHGTIME_CHG
);
1683 xfs_trans_log_inode(tp
, dp
, XFS_ILOG_CORE
);
1686 * If this is a synchronous mount, make sure that the
1687 * symlink transaction goes to disk before returning to
1690 if (mp
->m_flags
& (XFS_MOUNT_WSYNC
|XFS_MOUNT_DIRSYNC
)) {
1691 xfs_trans_set_sync(tp
);
1694 error
= xfs_bmap_finish(&tp
, &free_list
, &committed
);
1698 error
= xfs_trans_commit(tp
, XFS_TRANS_RELEASE_LOG_RES
);
1699 xfs_qm_dqrele(udqp
);
1700 xfs_qm_dqrele(gdqp
);
1708 xfs_bmap_cancel(&free_list
);
1709 cancel_flags
|= XFS_TRANS_ABORT
;
1711 xfs_trans_cancel(tp
, cancel_flags
);
1712 xfs_qm_dqrele(udqp
);
1713 xfs_qm_dqrele(gdqp
);
1715 if (unlock_dp_on_error
)
1716 xfs_iunlock(dp
, XFS_ILOCK_EXCL
);
1727 xfs_mount_t
*mp
= ip
->i_mount
;
1731 if (!capable(CAP_SYS_ADMIN
))
1732 return XFS_ERROR(EPERM
);
1734 if (XFS_FORCED_SHUTDOWN(mp
))
1735 return XFS_ERROR(EIO
);
1737 tp
= xfs_trans_alloc(mp
, XFS_TRANS_SET_DMATTRS
);
1738 error
= xfs_trans_reserve(tp
, 0, XFS_ICHANGE_LOG_RES (mp
), 0, 0, 0);
1740 xfs_trans_cancel(tp
, 0);
1743 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
1744 xfs_trans_ijoin(tp
, ip
, XFS_ILOCK_EXCL
);
1746 ip
->i_d
.di_dmevmask
= evmask
;
1747 ip
->i_d
.di_dmstate
= state
;
1749 xfs_trans_log_inode(tp
, ip
, XFS_ILOG_CORE
);
1750 error
= xfs_trans_commit(tp
, 0);
1756 * xfs_alloc_file_space()
1757 * This routine allocates disk space for the given file.
1759 * If alloc_type == 0, this request is for an ALLOCSP type
1760 * request which will change the file size. In this case, no
1761 * DMAPI event will be generated by the call. A TRUNCATE event
1762 * will be generated later by xfs_setattr.
1764 * If alloc_type != 0, this request is for a RESVSP type
1765 * request, and a DMAPI DM_EVENT_WRITE will be generated if the
1766 * lower block boundary byte address is less than the file's
1775 xfs_alloc_file_space(
1782 xfs_mount_t
*mp
= ip
->i_mount
;
1784 xfs_filblks_t allocated_fsb
;
1785 xfs_filblks_t allocatesize_fsb
;
1786 xfs_extlen_t extsz
, temp
;
1787 xfs_fileoff_t startoffset_fsb
;
1788 xfs_fsblock_t firstfsb
;
1793 xfs_bmbt_irec_t imaps
[1], *imapp
;
1794 xfs_bmap_free_t free_list
;
1795 uint qblocks
, resblks
, resrtextents
;
1799 trace_xfs_alloc_file_space(ip
);
1801 if (XFS_FORCED_SHUTDOWN(mp
))
1802 return XFS_ERROR(EIO
);
1804 error
= xfs_qm_dqattach(ip
, 0);
1809 return XFS_ERROR(EINVAL
);
1811 rt
= XFS_IS_REALTIME_INODE(ip
);
1812 extsz
= xfs_get_extsz_hint(ip
);
1817 startoffset_fsb
= XFS_B_TO_FSBT(mp
, offset
);
1818 allocatesize_fsb
= XFS_B_TO_FSB(mp
, count
);
1821 * Allocate file space until done or until there is an error
1823 while (allocatesize_fsb
&& !error
) {
1827 * Determine space reservations for data/realtime.
1829 if (unlikely(extsz
)) {
1830 s
= startoffset_fsb
;
1833 e
= startoffset_fsb
+ allocatesize_fsb
;
1834 if ((temp
= do_mod(startoffset_fsb
, extsz
)))
1836 if ((temp
= do_mod(e
, extsz
)))
1840 e
= allocatesize_fsb
;
1844 * The transaction reservation is limited to a 32-bit block
1845 * count, hence we need to limit the number of blocks we are
1846 * trying to reserve to avoid an overflow. We can't allocate
1847 * more than @nimaps extents, and an extent is limited on disk
1848 * to MAXEXTLEN (21 bits), so use that to enforce the limit.
1850 resblks
= min_t(xfs_fileoff_t
, (e
- s
), (MAXEXTLEN
* nimaps
));
1852 resrtextents
= qblocks
= resblks
;
1853 resrtextents
/= mp
->m_sb
.sb_rextsize
;
1854 resblks
= XFS_DIOSTRAT_SPACE_RES(mp
, 0);
1855 quota_flag
= XFS_QMOPT_RES_RTBLKS
;
1858 resblks
= qblocks
= XFS_DIOSTRAT_SPACE_RES(mp
, resblks
);
1859 quota_flag
= XFS_QMOPT_RES_REGBLKS
;
1863 * Allocate and setup the transaction.
1865 tp
= xfs_trans_alloc(mp
, XFS_TRANS_DIOSTRAT
);
1866 error
= xfs_trans_reserve(tp
, resblks
,
1867 XFS_WRITE_LOG_RES(mp
), resrtextents
,
1868 XFS_TRANS_PERM_LOG_RES
,
1869 XFS_WRITE_LOG_COUNT
);
1871 * Check for running out of space
1875 * Free the transaction structure.
1877 ASSERT(error
== ENOSPC
|| XFS_FORCED_SHUTDOWN(mp
));
1878 xfs_trans_cancel(tp
, 0);
1881 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
1882 error
= xfs_trans_reserve_quota_nblks(tp
, ip
, qblocks
,
1887 xfs_trans_ijoin(tp
, ip
, 0);
1889 xfs_bmap_init(&free_list
, &firstfsb
);
1890 error
= xfs_bmapi_write(tp
, ip
, startoffset_fsb
,
1891 allocatesize_fsb
, alloc_type
, &firstfsb
,
1892 0, imapp
, &nimaps
, &free_list
);
1898 * Complete the transaction
1900 error
= xfs_bmap_finish(&tp
, &free_list
, &committed
);
1905 error
= xfs_trans_commit(tp
, XFS_TRANS_RELEASE_LOG_RES
);
1906 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
1911 allocated_fsb
= imapp
->br_blockcount
;
1914 error
= XFS_ERROR(ENOSPC
);
1918 startoffset_fsb
+= allocated_fsb
;
1919 allocatesize_fsb
-= allocated_fsb
;
1924 error0
: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */
1925 xfs_bmap_cancel(&free_list
);
1926 xfs_trans_unreserve_quota_nblks(tp
, ip
, qblocks
, 0, quota_flag
);
1928 error1
: /* Just cancel transaction */
1929 xfs_trans_cancel(tp
, XFS_TRANS_RELEASE_LOG_RES
| XFS_TRANS_ABORT
);
1930 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
1935 * Zero file bytes between startoff and endoff inclusive.
1936 * The iolock is held exclusive and no blocks are buffered.
1938 * This function is used by xfs_free_file_space() to zero
1939 * partial blocks when the range to free is not block aligned.
1940 * When unreserving space with boundaries that are not block
1941 * aligned we round up the start and round down the end
1942 * boundaries and then use this function to zero the parts of
1943 * the blocks that got dropped during the rounding.
1946 xfs_zero_remaining_bytes(
1951 xfs_bmbt_irec_t imap
;
1952 xfs_fileoff_t offset_fsb
;
1953 xfs_off_t lastoffset
;
1956 xfs_mount_t
*mp
= ip
->i_mount
;
1961 * Avoid doing I/O beyond eof - it's not necessary
1962 * since nothing can read beyond eof. The space will
1963 * be zeroed when the file is extended anyway.
1965 if (startoff
>= ip
->i_size
)
1968 if (endoff
> ip
->i_size
)
1969 endoff
= ip
->i_size
;
1971 bp
= xfs_buf_get_uncached(XFS_IS_REALTIME_INODE(ip
) ?
1972 mp
->m_rtdev_targp
: mp
->m_ddev_targp
,
1973 mp
->m_sb
.sb_blocksize
, XBF_DONT_BLOCK
);
1975 return XFS_ERROR(ENOMEM
);
1979 for (offset
= startoff
; offset
<= endoff
; offset
= lastoffset
+ 1) {
1980 offset_fsb
= XFS_B_TO_FSBT(mp
, offset
);
1982 error
= xfs_bmapi_read(ip
, offset_fsb
, 1, &imap
, &nimap
, 0);
1983 if (error
|| nimap
< 1)
1985 ASSERT(imap
.br_blockcount
>= 1);
1986 ASSERT(imap
.br_startoff
== offset_fsb
);
1987 lastoffset
= XFS_FSB_TO_B(mp
, imap
.br_startoff
+ 1) - 1;
1988 if (lastoffset
> endoff
)
1989 lastoffset
= endoff
;
1990 if (imap
.br_startblock
== HOLESTARTBLOCK
)
1992 ASSERT(imap
.br_startblock
!= DELAYSTARTBLOCK
);
1993 if (imap
.br_state
== XFS_EXT_UNWRITTEN
)
1996 XFS_BUF_UNWRITE(bp
);
1998 XFS_BUF_SET_ADDR(bp
, xfs_fsb_to_db(ip
, imap
.br_startblock
));
2000 error
= xfs_buf_iowait(bp
);
2002 xfs_buf_ioerror_alert(bp
,
2003 "xfs_zero_remaining_bytes(read)");
2007 (offset
- XFS_FSB_TO_B(mp
, imap
.br_startoff
)),
2008 0, lastoffset
- offset
+ 1);
2013 error
= xfs_buf_iowait(bp
);
2015 xfs_buf_ioerror_alert(bp
,
2016 "xfs_zero_remaining_bytes(write)");
2025 * xfs_free_file_space()
2026 * This routine frees disk space for the given file.
2028 * This routine is only called by xfs_change_file_space
2029 * for an UNRESVSP type call.
2037 xfs_free_file_space(
2045 xfs_fileoff_t endoffset_fsb
;
2047 xfs_fsblock_t firstfsb
;
2048 xfs_bmap_free_t free_list
;
2049 xfs_bmbt_irec_t imap
;
2057 xfs_fileoff_t startoffset_fsb
;
2059 int need_iolock
= 1;
2063 trace_xfs_free_file_space(ip
);
2065 error
= xfs_qm_dqattach(ip
, 0);
2070 if (len
<= 0) /* if nothing being freed */
2072 rt
= XFS_IS_REALTIME_INODE(ip
);
2073 startoffset_fsb
= XFS_B_TO_FSB(mp
, offset
);
2074 endoffset_fsb
= XFS_B_TO_FSBT(mp
, offset
+ len
);
2076 if (attr_flags
& XFS_ATTR_NOLOCK
)
2079 xfs_ilock(ip
, XFS_IOLOCK_EXCL
);
2080 /* wait for the completion of any pending DIOs */
2081 inode_dio_wait(VFS_I(ip
));
2084 rounding
= max_t(uint
, 1 << mp
->m_sb
.sb_blocklog
, PAGE_CACHE_SIZE
);
2085 ioffset
= offset
& ~(rounding
- 1);
2087 if (VN_CACHED(VFS_I(ip
)) != 0) {
2088 error
= xfs_flushinval_pages(ip
, ioffset
, -1, FI_REMAPF_LOCKED
);
2090 goto out_unlock_iolock
;
2094 * Need to zero the stuff we're not freeing, on disk.
2095 * If it's a realtime file & can't use unwritten extents then we
2096 * actually need to zero the extent edges. Otherwise xfs_bunmapi
2097 * will take care of it for us.
2099 if (rt
&& !xfs_sb_version_hasextflgbit(&mp
->m_sb
)) {
2101 error
= xfs_bmapi_read(ip
, startoffset_fsb
, 1,
2104 goto out_unlock_iolock
;
2105 ASSERT(nimap
== 0 || nimap
== 1);
2106 if (nimap
&& imap
.br_startblock
!= HOLESTARTBLOCK
) {
2109 ASSERT(imap
.br_startblock
!= DELAYSTARTBLOCK
);
2110 block
= imap
.br_startblock
;
2111 mod
= do_div(block
, mp
->m_sb
.sb_rextsize
);
2113 startoffset_fsb
+= mp
->m_sb
.sb_rextsize
- mod
;
2116 error
= xfs_bmapi_read(ip
, endoffset_fsb
- 1, 1,
2119 goto out_unlock_iolock
;
2120 ASSERT(nimap
== 0 || nimap
== 1);
2121 if (nimap
&& imap
.br_startblock
!= HOLESTARTBLOCK
) {
2122 ASSERT(imap
.br_startblock
!= DELAYSTARTBLOCK
);
2124 if (mod
&& (mod
!= mp
->m_sb
.sb_rextsize
))
2125 endoffset_fsb
-= mod
;
2128 if ((done
= (endoffset_fsb
<= startoffset_fsb
)))
2130 * One contiguous piece to clear
2132 error
= xfs_zero_remaining_bytes(ip
, offset
, offset
+ len
- 1);
2135 * Some full blocks, possibly two pieces to clear
2137 if (offset
< XFS_FSB_TO_B(mp
, startoffset_fsb
))
2138 error
= xfs_zero_remaining_bytes(ip
, offset
,
2139 XFS_FSB_TO_B(mp
, startoffset_fsb
) - 1);
2141 XFS_FSB_TO_B(mp
, endoffset_fsb
) < offset
+ len
)
2142 error
= xfs_zero_remaining_bytes(ip
,
2143 XFS_FSB_TO_B(mp
, endoffset_fsb
),
2148 * free file space until done or until there is an error
2150 resblks
= XFS_DIOSTRAT_SPACE_RES(mp
, 0);
2151 while (!error
&& !done
) {
2154 * allocate and setup the transaction. Allow this
2155 * transaction to dip into the reserve blocks to ensure
2156 * the freeing of the space succeeds at ENOSPC.
2158 tp
= xfs_trans_alloc(mp
, XFS_TRANS_DIOSTRAT
);
2159 tp
->t_flags
|= XFS_TRANS_RESERVE
;
2160 error
= xfs_trans_reserve(tp
,
2162 XFS_WRITE_LOG_RES(mp
),
2164 XFS_TRANS_PERM_LOG_RES
,
2165 XFS_WRITE_LOG_COUNT
);
2168 * check for running out of space
2172 * Free the transaction structure.
2174 ASSERT(error
== ENOSPC
|| XFS_FORCED_SHUTDOWN(mp
));
2175 xfs_trans_cancel(tp
, 0);
2178 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
2179 error
= xfs_trans_reserve_quota(tp
, mp
,
2180 ip
->i_udquot
, ip
->i_gdquot
,
2181 resblks
, 0, XFS_QMOPT_RES_REGBLKS
);
2185 xfs_trans_ijoin(tp
, ip
, 0);
2188 * issue the bunmapi() call to free the blocks
2190 xfs_bmap_init(&free_list
, &firstfsb
);
2191 error
= xfs_bunmapi(tp
, ip
, startoffset_fsb
,
2192 endoffset_fsb
- startoffset_fsb
,
2193 0, 2, &firstfsb
, &free_list
, &done
);
2199 * complete the transaction
2201 error
= xfs_bmap_finish(&tp
, &free_list
, &committed
);
2206 error
= xfs_trans_commit(tp
, XFS_TRANS_RELEASE_LOG_RES
);
2207 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
2212 xfs_iunlock(ip
, XFS_IOLOCK_EXCL
);
2216 xfs_bmap_cancel(&free_list
);
2218 xfs_trans_cancel(tp
, XFS_TRANS_RELEASE_LOG_RES
| XFS_TRANS_ABORT
);
2219 xfs_iunlock(ip
, need_iolock
? (XFS_ILOCK_EXCL
| XFS_IOLOCK_EXCL
) :
2225 * xfs_change_file_space()
2226 * This routine allocates or frees disk space for the given file.
2227 * The user specified parameters are checked for alignment and size
2236 xfs_change_file_space(
2243 xfs_mount_t
*mp
= ip
->i_mount
;
2248 xfs_off_t startoffset
;
2254 if (!S_ISREG(ip
->i_d
.di_mode
))
2255 return XFS_ERROR(EINVAL
);
2257 switch (bf
->l_whence
) {
2258 case 0: /*SEEK_SET*/
2260 case 1: /*SEEK_CUR*/
2261 bf
->l_start
+= offset
;
2263 case 2: /*SEEK_END*/
2264 bf
->l_start
+= ip
->i_size
;
2267 return XFS_ERROR(EINVAL
);
2270 llen
= bf
->l_len
> 0 ? bf
->l_len
- 1 : bf
->l_len
;
2272 if ( (bf
->l_start
< 0)
2273 || (bf
->l_start
> XFS_MAXIOFFSET(mp
))
2274 || (bf
->l_start
+ llen
< 0)
2275 || (bf
->l_start
+ llen
> XFS_MAXIOFFSET(mp
)))
2276 return XFS_ERROR(EINVAL
);
2280 startoffset
= bf
->l_start
;
2284 * XFS_IOC_RESVSP and XFS_IOC_UNRESVSP will reserve or unreserve
2286 * These calls do NOT zero the data space allocated to the file,
2287 * nor do they change the file size.
2289 * XFS_IOC_ALLOCSP and XFS_IOC_FREESP will allocate and free file
2291 * These calls cause the new file data to be zeroed and the file
2292 * size to be changed.
2294 setprealloc
= clrprealloc
= 0;
2295 prealloc_type
= XFS_BMAPI_PREALLOC
;
2298 case XFS_IOC_ZERO_RANGE
:
2299 prealloc_type
|= XFS_BMAPI_CONVERT
;
2300 xfs_tosspages(ip
, startoffset
, startoffset
+ bf
->l_len
, 0);
2302 case XFS_IOC_RESVSP
:
2303 case XFS_IOC_RESVSP64
:
2304 error
= xfs_alloc_file_space(ip
, startoffset
, bf
->l_len
,
2305 prealloc_type
, attr_flags
);
2311 case XFS_IOC_UNRESVSP
:
2312 case XFS_IOC_UNRESVSP64
:
2313 if ((error
= xfs_free_file_space(ip
, startoffset
, bf
->l_len
,
2318 case XFS_IOC_ALLOCSP
:
2319 case XFS_IOC_ALLOCSP64
:
2320 case XFS_IOC_FREESP
:
2321 case XFS_IOC_FREESP64
:
2322 if (startoffset
> fsize
) {
2323 error
= xfs_alloc_file_space(ip
, fsize
,
2324 startoffset
- fsize
, 0, attr_flags
);
2329 iattr
.ia_valid
= ATTR_SIZE
;
2330 iattr
.ia_size
= startoffset
;
2332 error
= xfs_setattr_size(ip
, &iattr
, attr_flags
);
2342 return XFS_ERROR(EINVAL
);
2346 * update the inode timestamp, mode, and prealloc flag bits
2348 tp
= xfs_trans_alloc(mp
, XFS_TRANS_WRITEID
);
2350 if ((error
= xfs_trans_reserve(tp
, 0, XFS_WRITEID_LOG_RES(mp
),
2353 xfs_trans_cancel(tp
, 0);
2357 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
2358 xfs_trans_ijoin(tp
, ip
, XFS_ILOCK_EXCL
);
2360 if ((attr_flags
& XFS_ATTR_DMI
) == 0) {
2361 ip
->i_d
.di_mode
&= ~S_ISUID
;
2364 * Note that we don't have to worry about mandatory
2365 * file locking being disabled here because we only
2366 * clear the S_ISGID bit if the Group execute bit is
2367 * on, but if it was on then mandatory locking wouldn't
2368 * have been enabled.
2370 if (ip
->i_d
.di_mode
& S_IXGRP
)
2371 ip
->i_d
.di_mode
&= ~S_ISGID
;
2373 xfs_trans_ichgtime(tp
, ip
, XFS_ICHGTIME_MOD
| XFS_ICHGTIME_CHG
);
2376 ip
->i_d
.di_flags
|= XFS_DIFLAG_PREALLOC
;
2377 else if (clrprealloc
)
2378 ip
->i_d
.di_flags
&= ~XFS_DIFLAG_PREALLOC
;
2380 xfs_trans_log_inode(tp
, ip
, XFS_ILOG_CORE
);
2381 if (attr_flags
& XFS_ATTR_SYNC
)
2382 xfs_trans_set_sync(tp
);
2383 return xfs_trans_commit(tp
, 0);