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 return XFS_ERROR(EFSCORRUPTED
);
138 if (ip
->i_df
.if_flags
& XFS_IFINLINE
) {
139 memcpy(link
, ip
->i_df
.if_u1
.if_data
, pathlen
);
140 link
[pathlen
] = '\0';
142 error
= xfs_readlink_bmap(ip
, link
);
146 xfs_iunlock(ip
, XFS_ILOCK_SHARED
);
151 * Flags for xfs_free_eofblocks
153 #define XFS_FREE_EOF_TRYLOCK (1<<0)
156 * This is called by xfs_inactive to free any blocks beyond eof
157 * when the link count isn't zero and by xfs_dm_punch_hole() when
158 * punching a hole to EOF.
168 xfs_fileoff_t end_fsb
;
169 xfs_fileoff_t last_fsb
;
170 xfs_filblks_t map_len
;
172 xfs_bmbt_irec_t imap
;
175 * Figure out if there are any blocks beyond the end
176 * of the file. If not, then there is nothing to do.
178 end_fsb
= XFS_B_TO_FSB(mp
, (xfs_ufsize_t
)XFS_ISIZE(ip
));
179 last_fsb
= XFS_B_TO_FSB(mp
, (xfs_ufsize_t
)XFS_MAXIOFFSET(mp
));
180 if (last_fsb
<= end_fsb
)
182 map_len
= last_fsb
- end_fsb
;
185 xfs_ilock(ip
, XFS_ILOCK_SHARED
);
186 error
= xfs_bmapi_read(ip
, end_fsb
, map_len
, &imap
, &nimaps
, 0);
187 xfs_iunlock(ip
, XFS_ILOCK_SHARED
);
189 if (!error
&& (nimaps
!= 0) &&
190 (imap
.br_startblock
!= HOLESTARTBLOCK
||
191 ip
->i_delayed_blks
)) {
193 * Attach the dquots to the inode up front.
195 error
= xfs_qm_dqattach(ip
, 0);
200 * There are blocks after the end of file.
201 * Free them up now by truncating the file to
204 tp
= xfs_trans_alloc(mp
, XFS_TRANS_INACTIVE
);
206 if (flags
& XFS_FREE_EOF_TRYLOCK
) {
207 if (!xfs_ilock_nowait(ip
, XFS_IOLOCK_EXCL
)) {
208 xfs_trans_cancel(tp
, 0);
212 xfs_ilock(ip
, XFS_IOLOCK_EXCL
);
215 error
= xfs_trans_reserve(tp
, 0,
216 XFS_ITRUNCATE_LOG_RES(mp
),
217 0, XFS_TRANS_PERM_LOG_RES
,
218 XFS_ITRUNCATE_LOG_COUNT
);
220 ASSERT(XFS_FORCED_SHUTDOWN(mp
));
221 xfs_trans_cancel(tp
, 0);
222 xfs_iunlock(ip
, XFS_IOLOCK_EXCL
);
226 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
227 xfs_trans_ijoin(tp
, ip
, 0);
230 * Do not update the on-disk file size. If we update the
231 * on-disk file size and then the system crashes before the
232 * contents of the file are flushed to disk then the files
233 * may be full of holes (ie NULL files bug).
235 error
= xfs_itruncate_extents(&tp
, ip
, XFS_DATA_FORK
,
239 * If we get an error at this point we simply don't
240 * bother truncating the file.
243 (XFS_TRANS_RELEASE_LOG_RES
|
246 error
= xfs_trans_commit(tp
,
247 XFS_TRANS_RELEASE_LOG_RES
);
249 xfs_iunlock(ip
, XFS_IOLOCK_EXCL
|XFS_ILOCK_EXCL
);
255 * Free a symlink that has blocks associated with it.
258 xfs_inactive_symlink_rmt(
266 xfs_fsblock_t first_block
;
267 xfs_bmap_free_t free_list
;
270 xfs_bmbt_irec_t mval
[SYMLINK_MAPS
];
278 ASSERT(ip
->i_d
.di_size
> XFS_IFORK_DSIZE(ip
));
280 * We're freeing a symlink that has some
281 * blocks allocated to it. Free the
282 * blocks here. We know that we've got
283 * either 1 or 2 extents and that we can
284 * free them all in one bunmapi call.
286 ASSERT(ip
->i_d
.di_nextents
> 0 && ip
->i_d
.di_nextents
<= 2);
287 if ((error
= xfs_trans_reserve(tp
, 0, XFS_ITRUNCATE_LOG_RES(mp
), 0,
288 XFS_TRANS_PERM_LOG_RES
, XFS_ITRUNCATE_LOG_COUNT
))) {
289 ASSERT(XFS_FORCED_SHUTDOWN(mp
));
290 xfs_trans_cancel(tp
, 0);
295 * Lock the inode, fix the size, and join it to the transaction.
296 * Hold it so in the normal path, we still have it locked for
297 * the second transaction. In the error paths we need it
298 * held so the cancel won't rele it, see below.
300 xfs_ilock(ip
, XFS_IOLOCK_EXCL
| XFS_ILOCK_EXCL
);
301 size
= (int)ip
->i_d
.di_size
;
303 xfs_trans_ijoin(tp
, ip
, 0);
304 xfs_trans_log_inode(tp
, ip
, XFS_ILOG_CORE
);
306 * Find the block(s) so we can inval and unmap them.
309 xfs_bmap_init(&free_list
, &first_block
);
310 nmaps
= ARRAY_SIZE(mval
);
311 error
= xfs_bmapi_read(ip
, 0, XFS_B_TO_FSB(mp
, size
),
316 * Invalidate the block(s).
318 for (i
= 0; i
< nmaps
; i
++) {
319 bp
= xfs_trans_get_buf(tp
, mp
->m_ddev_targp
,
320 XFS_FSB_TO_DADDR(mp
, mval
[i
].br_startblock
),
321 XFS_FSB_TO_BB(mp
, mval
[i
].br_blockcount
), 0);
326 xfs_trans_binval(tp
, bp
);
329 * Unmap the dead block(s) to the free_list.
331 if ((error
= xfs_bunmapi(tp
, ip
, 0, size
, XFS_BMAPI_METADATA
, nmaps
,
332 &first_block
, &free_list
, &done
)))
336 * Commit the first transaction. This logs the EFI and the inode.
338 if ((error
= xfs_bmap_finish(&tp
, &free_list
, &committed
)))
341 * The transaction must have been committed, since there were
342 * actually extents freed by xfs_bunmapi. See xfs_bmap_finish.
343 * The new tp has the extent freeing and EFDs.
347 * The first xact was committed, so add the inode to the new one.
348 * Mark it dirty so it will be logged and moved forward in the log as
349 * part of every commit.
351 xfs_trans_ijoin(tp
, ip
, 0);
352 xfs_trans_log_inode(tp
, ip
, XFS_ILOG_CORE
);
354 * Get a new, empty transaction to return to our caller.
356 ntp
= xfs_trans_dup(tp
);
358 * Commit the transaction containing extent freeing and EFDs.
359 * If we get an error on the commit here or on the reserve below,
360 * we need to unlock the inode since the new transaction doesn't
361 * have the inode attached.
363 error
= xfs_trans_commit(tp
, 0);
366 ASSERT(XFS_FORCED_SHUTDOWN(mp
));
370 * transaction commit worked ok so we can drop the extra ticket
371 * reference that we gained in xfs_trans_dup()
373 xfs_log_ticket_put(tp
->t_ticket
);
376 * Remove the memory for extent descriptions (just bookkeeping).
378 if (ip
->i_df
.if_bytes
)
379 xfs_idata_realloc(ip
, -ip
->i_df
.if_bytes
, XFS_DATA_FORK
);
380 ASSERT(ip
->i_df
.if_bytes
== 0);
382 * Put an itruncate log reservation in the new transaction
385 if ((error
= xfs_trans_reserve(tp
, 0, XFS_ITRUNCATE_LOG_RES(mp
), 0,
386 XFS_TRANS_PERM_LOG_RES
, XFS_ITRUNCATE_LOG_COUNT
))) {
387 ASSERT(XFS_FORCED_SHUTDOWN(mp
));
391 * Return with the inode locked but not joined to the transaction.
397 xfs_bmap_cancel(&free_list
);
400 * Have to come here with the inode locked and either
401 * (held and in the transaction) or (not in the transaction).
402 * If the inode isn't held then cancel would iput it, but
403 * that's wrong since this is inactive and the vnode ref
404 * count is 0 already.
405 * Cancel won't do anything to the inode if held, but it still
406 * needs to be locked until the cancel is done, if it was
407 * joined to the transaction.
409 xfs_trans_cancel(tp
, XFS_TRANS_RELEASE_LOG_RES
| XFS_TRANS_ABORT
);
410 xfs_iunlock(ip
, XFS_IOLOCK_EXCL
| XFS_ILOCK_EXCL
);
417 xfs_inactive_symlink_local(
423 ASSERT(ip
->i_d
.di_size
<= XFS_IFORK_DSIZE(ip
));
425 * We're freeing a symlink which fit into
426 * the inode. Just free the memory used
427 * to hold the old symlink.
429 error
= xfs_trans_reserve(*tpp
, 0,
430 XFS_ITRUNCATE_LOG_RES(ip
->i_mount
),
431 0, XFS_TRANS_PERM_LOG_RES
,
432 XFS_ITRUNCATE_LOG_COUNT
);
435 xfs_trans_cancel(*tpp
, 0);
439 xfs_ilock(ip
, XFS_ILOCK_EXCL
| XFS_IOLOCK_EXCL
);
442 * Zero length symlinks _can_ exist.
444 if (ip
->i_df
.if_bytes
> 0) {
445 xfs_idata_realloc(ip
,
446 -(ip
->i_df
.if_bytes
),
448 ASSERT(ip
->i_df
.if_bytes
== 0);
462 ASSERT(xfs_isilocked(ip
, XFS_IOLOCK_EXCL
));
465 ASSERT(ip
->i_d
.di_forkoff
!= 0);
466 error
= xfs_trans_commit(tp
, XFS_TRANS_RELEASE_LOG_RES
);
467 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
471 error
= xfs_attr_inactive(ip
);
475 tp
= xfs_trans_alloc(mp
, XFS_TRANS_INACTIVE
);
476 error
= xfs_trans_reserve(tp
, 0,
477 XFS_IFREE_LOG_RES(mp
),
478 0, XFS_TRANS_PERM_LOG_RES
,
479 XFS_INACTIVE_LOG_COUNT
);
483 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
484 xfs_trans_ijoin(tp
, ip
, 0);
485 xfs_idestroy_fork(ip
, XFS_ATTR_FORK
);
487 ASSERT(ip
->i_d
.di_anextents
== 0);
493 ASSERT(XFS_FORCED_SHUTDOWN(mp
));
494 xfs_trans_cancel(tp
, 0);
497 xfs_iunlock(ip
, XFS_IOLOCK_EXCL
);
505 xfs_mount_t
*mp
= ip
->i_mount
;
508 if (!S_ISREG(ip
->i_d
.di_mode
) || (ip
->i_d
.di_mode
== 0))
511 /* If this is a read-only mount, don't do this (would generate I/O) */
512 if (mp
->m_flags
& XFS_MOUNT_RDONLY
)
515 if (!XFS_FORCED_SHUTDOWN(mp
)) {
519 * If we are using filestreams, and we have an unlinked
520 * file that we are processing the last close on, then nothing
521 * will be able to reopen and write to this file. Purge this
522 * inode from the filestreams cache so that it doesn't delay
523 * teardown of the inode.
525 if ((ip
->i_d
.di_nlink
== 0) && xfs_inode_is_filestream(ip
))
526 xfs_filestream_deassociate(ip
);
529 * If we previously truncated this file and removed old data
530 * in the process, we want to initiate "early" writeout on
531 * the last close. This is an attempt to combat the notorious
532 * NULL files problem which is particularly noticeable from a
533 * truncate down, buffered (re-)write (delalloc), followed by
534 * a crash. What we are effectively doing here is
535 * significantly reducing the time window where we'd otherwise
536 * be exposed to that problem.
538 truncated
= xfs_iflags_test_and_clear(ip
, XFS_ITRUNCATED
);
540 xfs_iflags_clear(ip
, XFS_IDIRTY_RELEASE
);
541 if (VN_DIRTY(VFS_I(ip
)) && ip
->i_delayed_blks
> 0)
542 xfs_flush_pages(ip
, 0, -1, XBF_ASYNC
, FI_NONE
);
546 if (ip
->i_d
.di_nlink
== 0)
549 if ((S_ISREG(ip
->i_d
.di_mode
) &&
550 (VFS_I(ip
)->i_size
> 0 ||
551 (VN_CACHED(VFS_I(ip
)) > 0 || ip
->i_delayed_blks
> 0)) &&
552 (ip
->i_df
.if_flags
& XFS_IFEXTENTS
)) &&
553 (!(ip
->i_d
.di_flags
& (XFS_DIFLAG_PREALLOC
| XFS_DIFLAG_APPEND
)))) {
556 * If we can't get the iolock just skip truncating the blocks
557 * past EOF because we could deadlock with the mmap_sem
558 * otherwise. We'll get another chance to drop them once the
559 * last reference to the inode is dropped, so we'll never leak
560 * blocks permanently.
562 * Further, check if the inode is being opened, written and
563 * closed frequently and we have delayed allocation blocks
564 * outstanding (e.g. streaming writes from the NFS server),
565 * truncating the blocks past EOF will cause fragmentation to
568 * In this case don't do the truncation, either, but we have to
569 * be careful how we detect this case. Blocks beyond EOF show
570 * up as i_delayed_blks even when the inode is clean, so we
571 * need to truncate them away first before checking for a dirty
572 * release. Hence on the first dirty close we will still remove
573 * the speculative allocation, but after that we will leave it
576 if (xfs_iflags_test(ip
, XFS_IDIRTY_RELEASE
))
579 error
= xfs_free_eofblocks(mp
, ip
,
580 XFS_FREE_EOF_TRYLOCK
);
584 /* delalloc blocks after truncation means it really is dirty */
585 if (ip
->i_delayed_blks
)
586 xfs_iflags_set(ip
, XFS_IDIRTY_RELEASE
);
594 * This is called when the vnode reference count for the vnode
595 * goes to zero. If the file has been unlinked, then it must
596 * now be truncated. Also, we clear all of the read-ahead state
597 * kept for the inode here since the file is now closed.
603 xfs_bmap_free_t free_list
;
604 xfs_fsblock_t first_block
;
612 * If the inode is already free, then there can be nothing
615 if (ip
->i_d
.di_mode
== 0 || is_bad_inode(VFS_I(ip
))) {
616 ASSERT(ip
->i_df
.if_real_bytes
== 0);
617 ASSERT(ip
->i_df
.if_broot_bytes
== 0);
618 return VN_INACTIVE_CACHE
;
622 * Only do a truncate if it's a regular file with
623 * some actual space in it. It's OK to look at the
624 * inode's fields without the lock because we're the
625 * only one with a reference to the inode.
627 truncate
= ((ip
->i_d
.di_nlink
== 0) &&
628 ((ip
->i_d
.di_size
!= 0) || XFS_ISIZE(ip
) != 0 ||
629 (ip
->i_d
.di_nextents
> 0) || (ip
->i_delayed_blks
> 0)) &&
630 S_ISREG(ip
->i_d
.di_mode
));
636 /* If this is a read-only mount, don't do this (would generate I/O) */
637 if (mp
->m_flags
& XFS_MOUNT_RDONLY
)
640 if (ip
->i_d
.di_nlink
!= 0) {
641 if ((S_ISREG(ip
->i_d
.di_mode
) &&
642 (VFS_I(ip
)->i_size
> 0 ||
643 (VN_CACHED(VFS_I(ip
)) > 0 || ip
->i_delayed_blks
> 0)) &&
644 (ip
->i_df
.if_flags
& XFS_IFEXTENTS
) &&
645 (!(ip
->i_d
.di_flags
&
646 (XFS_DIFLAG_PREALLOC
| XFS_DIFLAG_APPEND
)) ||
647 ip
->i_delayed_blks
!= 0))) {
648 error
= xfs_free_eofblocks(mp
, ip
, 0);
650 return VN_INACTIVE_CACHE
;
655 ASSERT(ip
->i_d
.di_nlink
== 0);
657 error
= xfs_qm_dqattach(ip
, 0);
659 return VN_INACTIVE_CACHE
;
661 tp
= xfs_trans_alloc(mp
, XFS_TRANS_INACTIVE
);
663 xfs_ilock(ip
, XFS_IOLOCK_EXCL
);
665 error
= xfs_trans_reserve(tp
, 0,
666 XFS_ITRUNCATE_LOG_RES(mp
),
667 0, XFS_TRANS_PERM_LOG_RES
,
668 XFS_ITRUNCATE_LOG_COUNT
);
670 /* Don't call itruncate_cleanup */
671 ASSERT(XFS_FORCED_SHUTDOWN(mp
));
672 xfs_trans_cancel(tp
, 0);
673 xfs_iunlock(ip
, XFS_IOLOCK_EXCL
);
674 return VN_INACTIVE_CACHE
;
677 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
678 xfs_trans_ijoin(tp
, ip
, 0);
681 xfs_trans_log_inode(tp
, ip
, XFS_ILOG_CORE
);
683 error
= xfs_itruncate_extents(&tp
, ip
, XFS_DATA_FORK
, 0);
686 XFS_TRANS_RELEASE_LOG_RES
| XFS_TRANS_ABORT
);
687 xfs_iunlock(ip
, XFS_IOLOCK_EXCL
| XFS_ILOCK_EXCL
);
688 return VN_INACTIVE_CACHE
;
691 ASSERT(ip
->i_d
.di_nextents
== 0);
692 } else if (S_ISLNK(ip
->i_d
.di_mode
)) {
695 * If we get an error while cleaning up a
696 * symlink we bail out.
698 error
= (ip
->i_d
.di_size
> XFS_IFORK_DSIZE(ip
)) ?
699 xfs_inactive_symlink_rmt(ip
, &tp
) :
700 xfs_inactive_symlink_local(ip
, &tp
);
704 return VN_INACTIVE_CACHE
;
707 xfs_trans_ijoin(tp
, ip
, 0);
709 error
= xfs_trans_reserve(tp
, 0,
710 XFS_IFREE_LOG_RES(mp
),
711 0, XFS_TRANS_PERM_LOG_RES
,
712 XFS_INACTIVE_LOG_COUNT
);
714 ASSERT(XFS_FORCED_SHUTDOWN(mp
));
715 xfs_trans_cancel(tp
, 0);
716 return VN_INACTIVE_CACHE
;
719 xfs_ilock(ip
, XFS_ILOCK_EXCL
| XFS_IOLOCK_EXCL
);
720 xfs_trans_ijoin(tp
, ip
, 0);
724 * If there are attributes associated with the file
725 * then blow them away now. The code calls a routine
726 * that recursively deconstructs the attribute fork.
727 * We need to just commit the current transaction
728 * because we can't use it for xfs_attr_inactive().
730 if (ip
->i_d
.di_anextents
> 0) {
731 error
= xfs_inactive_attrs(ip
, &tp
);
733 * If we got an error, the transaction is already
734 * cancelled, and the inode is unlocked. Just get out.
737 return VN_INACTIVE_CACHE
;
738 } else if (ip
->i_afp
) {
739 xfs_idestroy_fork(ip
, XFS_ATTR_FORK
);
745 xfs_bmap_init(&free_list
, &first_block
);
746 error
= xfs_ifree(tp
, ip
, &free_list
);
749 * If we fail to free the inode, shut down. The cancel
750 * might do that, we need to make sure. Otherwise the
751 * inode might be lost for a long time or forever.
753 if (!XFS_FORCED_SHUTDOWN(mp
)) {
754 xfs_notice(mp
, "%s: xfs_ifree returned error %d",
756 xfs_force_shutdown(mp
, SHUTDOWN_META_IO_ERROR
);
758 xfs_trans_cancel(tp
, XFS_TRANS_RELEASE_LOG_RES
|XFS_TRANS_ABORT
);
761 * Credit the quota account(s). The inode is gone.
763 xfs_trans_mod_dquot_byino(tp
, ip
, XFS_TRANS_DQ_ICOUNT
, -1);
766 * Just ignore errors at this point. There is nothing we can
767 * do except to try to keep going. Make sure it's not a silent
770 error
= xfs_bmap_finish(&tp
, &free_list
, &committed
);
772 xfs_notice(mp
, "%s: xfs_bmap_finish returned error %d",
774 error
= xfs_trans_commit(tp
, XFS_TRANS_RELEASE_LOG_RES
);
776 xfs_notice(mp
, "%s: xfs_trans_commit returned error %d",
781 * Release the dquots held by inode, if any.
784 xfs_iunlock(ip
, XFS_IOLOCK_EXCL
| XFS_ILOCK_EXCL
);
787 return VN_INACTIVE_CACHE
;
791 * Lookups up an inode from "name". If ci_name is not NULL, then a CI match
792 * is allowed, otherwise it has to be an exact match. If a CI match is found,
793 * ci_name->name will point to a the actual name (caller must free) or
794 * will be set to NULL if an exact match is found.
799 struct xfs_name
*name
,
801 struct xfs_name
*ci_name
)
807 trace_xfs_lookup(dp
, name
);
809 if (XFS_FORCED_SHUTDOWN(dp
->i_mount
))
810 return XFS_ERROR(EIO
);
812 lock_mode
= xfs_ilock_map_shared(dp
);
813 error
= xfs_dir_lookup(NULL
, dp
, name
, &inum
, ci_name
);
814 xfs_iunlock_map_shared(dp
, lock_mode
);
819 error
= xfs_iget(dp
->i_mount
, NULL
, inum
, 0, 0, ipp
);
827 kmem_free(ci_name
->name
);
836 struct xfs_name
*name
,
841 int is_dir
= S_ISDIR(mode
);
842 struct xfs_mount
*mp
= dp
->i_mount
;
843 struct xfs_inode
*ip
= NULL
;
844 struct xfs_trans
*tp
= NULL
;
846 xfs_bmap_free_t free_list
;
847 xfs_fsblock_t first_block
;
848 boolean_t unlock_dp_on_error
= B_FALSE
;
852 struct xfs_dquot
*udqp
= NULL
;
853 struct xfs_dquot
*gdqp
= NULL
;
858 trace_xfs_create(dp
, name
);
860 if (XFS_FORCED_SHUTDOWN(mp
))
861 return XFS_ERROR(EIO
);
863 if (dp
->i_d
.di_flags
& XFS_DIFLAG_PROJINHERIT
)
864 prid
= xfs_get_projid(dp
);
866 prid
= XFS_PROJID_DEFAULT
;
869 * Make sure that we have allocated dquot(s) on disk.
871 error
= xfs_qm_vop_dqalloc(dp
, current_fsuid(), current_fsgid(), prid
,
872 XFS_QMOPT_QUOTALL
| XFS_QMOPT_INHERIT
, &udqp
, &gdqp
);
878 resblks
= XFS_MKDIR_SPACE_RES(mp
, name
->len
);
879 log_res
= XFS_MKDIR_LOG_RES(mp
);
880 log_count
= XFS_MKDIR_LOG_COUNT
;
881 tp
= xfs_trans_alloc(mp
, XFS_TRANS_MKDIR
);
883 resblks
= XFS_CREATE_SPACE_RES(mp
, name
->len
);
884 log_res
= XFS_CREATE_LOG_RES(mp
);
885 log_count
= XFS_CREATE_LOG_COUNT
;
886 tp
= xfs_trans_alloc(mp
, XFS_TRANS_CREATE
);
889 cancel_flags
= XFS_TRANS_RELEASE_LOG_RES
;
892 * Initially assume that the file does not exist and
893 * reserve the resources for that case. If that is not
894 * the case we'll drop the one we have and get a more
895 * appropriate transaction later.
897 error
= xfs_trans_reserve(tp
, resblks
, log_res
, 0,
898 XFS_TRANS_PERM_LOG_RES
, log_count
);
899 if (error
== ENOSPC
) {
900 /* flush outstanding delalloc blocks and retry */
901 xfs_flush_inodes(dp
);
902 error
= xfs_trans_reserve(tp
, resblks
, log_res
, 0,
903 XFS_TRANS_PERM_LOG_RES
, log_count
);
905 if (error
== ENOSPC
) {
906 /* No space at all so try a "no-allocation" reservation */
908 error
= xfs_trans_reserve(tp
, 0, log_res
, 0,
909 XFS_TRANS_PERM_LOG_RES
, log_count
);
913 goto out_trans_cancel
;
916 xfs_ilock(dp
, XFS_ILOCK_EXCL
| XFS_ILOCK_PARENT
);
917 unlock_dp_on_error
= B_TRUE
;
920 * Check for directory link count overflow.
922 if (is_dir
&& dp
->i_d
.di_nlink
>= XFS_MAXLINK
) {
923 error
= XFS_ERROR(EMLINK
);
924 goto out_trans_cancel
;
927 xfs_bmap_init(&free_list
, &first_block
);
930 * Reserve disk quota and the inode.
932 error
= xfs_trans_reserve_quota(tp
, mp
, udqp
, gdqp
, resblks
, 1, 0);
934 goto out_trans_cancel
;
936 error
= xfs_dir_canenter(tp
, dp
, name
, resblks
);
938 goto out_trans_cancel
;
941 * A newly created regular or special file just has one directory
942 * entry pointing to them, but a directory also the "." entry
943 * pointing to itself.
945 error
= xfs_dir_ialloc(&tp
, dp
, mode
, is_dir
? 2 : 1, rdev
,
946 prid
, resblks
> 0, &ip
, &committed
);
949 goto out_trans_cancel
;
950 goto out_trans_abort
;
954 * Now we join the directory inode to the transaction. We do not do it
955 * earlier because xfs_dir_ialloc might commit the previous transaction
956 * (and release all the locks). An error from here on will result in
957 * the transaction cancel unlocking dp so don't do it explicitly in the
960 xfs_trans_ijoin(tp
, dp
, XFS_ILOCK_EXCL
);
961 unlock_dp_on_error
= B_FALSE
;
963 error
= xfs_dir_createname(tp
, dp
, name
, ip
->i_ino
,
964 &first_block
, &free_list
, resblks
?
965 resblks
- XFS_IALLOC_SPACE_RES(mp
) : 0);
967 ASSERT(error
!= ENOSPC
);
968 goto out_trans_abort
;
970 xfs_trans_ichgtime(tp
, dp
, XFS_ICHGTIME_MOD
| XFS_ICHGTIME_CHG
);
971 xfs_trans_log_inode(tp
, dp
, XFS_ILOG_CORE
);
974 error
= xfs_dir_init(tp
, ip
, dp
);
976 goto out_bmap_cancel
;
978 error
= xfs_bumplink(tp
, dp
);
980 goto out_bmap_cancel
;
984 * If this is a synchronous mount, make sure that the
985 * create transaction goes to disk before returning to
988 if (mp
->m_flags
& (XFS_MOUNT_WSYNC
|XFS_MOUNT_DIRSYNC
))
989 xfs_trans_set_sync(tp
);
992 * Attach the dquot(s) to the inodes and modify them incore.
993 * These ids of the inode couldn't have changed since the new
994 * inode has been locked ever since it was created.
996 xfs_qm_vop_create_dqattach(tp
, ip
, udqp
, gdqp
);
998 error
= xfs_bmap_finish(&tp
, &free_list
, &committed
);
1000 goto out_bmap_cancel
;
1002 error
= xfs_trans_commit(tp
, XFS_TRANS_RELEASE_LOG_RES
);
1004 goto out_release_inode
;
1006 xfs_qm_dqrele(udqp
);
1007 xfs_qm_dqrele(gdqp
);
1013 xfs_bmap_cancel(&free_list
);
1015 cancel_flags
|= XFS_TRANS_ABORT
;
1017 xfs_trans_cancel(tp
, cancel_flags
);
1020 * Wait until after the current transaction is aborted to
1021 * release the inode. This prevents recursive transactions
1022 * and deadlocks from xfs_inactive.
1027 xfs_qm_dqrele(udqp
);
1028 xfs_qm_dqrele(gdqp
);
1030 if (unlock_dp_on_error
)
1031 xfs_iunlock(dp
, XFS_ILOCK_EXCL
);
1037 int xfs_small_retries
;
1038 int xfs_middle_retries
;
1039 int xfs_lots_retries
;
1040 int xfs_lock_delays
;
1044 * Bump the subclass so xfs_lock_inodes() acquires each lock with
1048 xfs_lock_inumorder(int lock_mode
, int subclass
)
1050 if (lock_mode
& (XFS_IOLOCK_SHARED
|XFS_IOLOCK_EXCL
))
1051 lock_mode
|= (subclass
+ XFS_LOCK_INUMORDER
) << XFS_IOLOCK_SHIFT
;
1052 if (lock_mode
& (XFS_ILOCK_SHARED
|XFS_ILOCK_EXCL
))
1053 lock_mode
|= (subclass
+ XFS_LOCK_INUMORDER
) << XFS_ILOCK_SHIFT
;
1059 * The following routine will lock n inodes in exclusive mode.
1060 * We assume the caller calls us with the inodes in i_ino order.
1062 * We need to detect deadlock where an inode that we lock
1063 * is in the AIL and we start waiting for another inode that is locked
1064 * by a thread in a long running transaction (such as truncate). This can
1065 * result in deadlock since the long running trans might need to wait
1066 * for the inode we just locked in order to push the tail and free space
1075 int attempts
= 0, i
, j
, try_lock
;
1078 ASSERT(ips
&& (inodes
>= 2)); /* we need at least two */
1084 for (; i
< inodes
; i
++) {
1087 if (i
&& (ips
[i
] == ips
[i
-1])) /* Already locked */
1091 * If try_lock is not set yet, make sure all locked inodes
1092 * are not in the AIL.
1093 * If any are, set try_lock to be used later.
1097 for (j
= (i
- 1); j
>= 0 && !try_lock
; j
--) {
1098 lp
= (xfs_log_item_t
*)ips
[j
]->i_itemp
;
1099 if (lp
&& (lp
->li_flags
& XFS_LI_IN_AIL
)) {
1106 * If any of the previous locks we have locked is in the AIL,
1107 * we must TRY to get the second and subsequent locks. If
1108 * we can't get any, we must release all we have
1113 /* try_lock must be 0 if i is 0. */
1115 * try_lock means we have an inode locked
1116 * that is in the AIL.
1119 if (!xfs_ilock_nowait(ips
[i
], xfs_lock_inumorder(lock_mode
, i
))) {
1123 * Unlock all previous guys and try again.
1124 * xfs_iunlock will try to push the tail
1125 * if the inode is in the AIL.
1128 for(j
= i
- 1; j
>= 0; j
--) {
1131 * Check to see if we've already
1132 * unlocked this one.
1133 * Not the first one going back,
1134 * and the inode ptr is the same.
1136 if ((j
!= (i
- 1)) && ips
[j
] ==
1140 xfs_iunlock(ips
[j
], lock_mode
);
1143 if ((attempts
% 5) == 0) {
1144 delay(1); /* Don't just spin the CPU */
1154 xfs_ilock(ips
[i
], xfs_lock_inumorder(lock_mode
, i
));
1160 if (attempts
< 5) xfs_small_retries
++;
1161 else if (attempts
< 100) xfs_middle_retries
++;
1162 else xfs_lots_retries
++;
1170 * xfs_lock_two_inodes() can only be used to lock one type of lock
1171 * at a time - the iolock or the ilock, but not both at once. If
1172 * we lock both at once, lockdep will report false positives saying
1173 * we have violated locking orders.
1176 xfs_lock_two_inodes(
1185 if (lock_mode
& (XFS_IOLOCK_SHARED
|XFS_IOLOCK_EXCL
))
1186 ASSERT((lock_mode
& (XFS_ILOCK_SHARED
|XFS_ILOCK_EXCL
)) == 0);
1187 ASSERT(ip0
->i_ino
!= ip1
->i_ino
);
1189 if (ip0
->i_ino
> ip1
->i_ino
) {
1196 xfs_ilock(ip0
, xfs_lock_inumorder(lock_mode
, 0));
1199 * If the first lock we have locked is in the AIL, we must TRY to get
1200 * the second lock. If we can't get it, we must release the first one
1203 lp
= (xfs_log_item_t
*)ip0
->i_itemp
;
1204 if (lp
&& (lp
->li_flags
& XFS_LI_IN_AIL
)) {
1205 if (!xfs_ilock_nowait(ip1
, xfs_lock_inumorder(lock_mode
, 1))) {
1206 xfs_iunlock(ip0
, lock_mode
);
1207 if ((++attempts
% 5) == 0)
1208 delay(1); /* Don't just spin the CPU */
1212 xfs_ilock(ip1
, xfs_lock_inumorder(lock_mode
, 1));
1219 struct xfs_name
*name
,
1222 xfs_mount_t
*mp
= dp
->i_mount
;
1223 xfs_trans_t
*tp
= NULL
;
1224 int is_dir
= S_ISDIR(ip
->i_d
.di_mode
);
1226 xfs_bmap_free_t free_list
;
1227 xfs_fsblock_t first_block
;
1234 trace_xfs_remove(dp
, name
);
1236 if (XFS_FORCED_SHUTDOWN(mp
))
1237 return XFS_ERROR(EIO
);
1239 error
= xfs_qm_dqattach(dp
, 0);
1243 error
= xfs_qm_dqattach(ip
, 0);
1248 tp
= xfs_trans_alloc(mp
, XFS_TRANS_RMDIR
);
1249 log_count
= XFS_DEFAULT_LOG_COUNT
;
1251 tp
= xfs_trans_alloc(mp
, XFS_TRANS_REMOVE
);
1252 log_count
= XFS_REMOVE_LOG_COUNT
;
1254 cancel_flags
= XFS_TRANS_RELEASE_LOG_RES
;
1257 * We try to get the real space reservation first,
1258 * allowing for directory btree deletion(s) implying
1259 * possible bmap insert(s). If we can't get the space
1260 * reservation then we use 0 instead, and avoid the bmap
1261 * btree insert(s) in the directory code by, if the bmap
1262 * insert tries to happen, instead trimming the LAST
1263 * block from the directory.
1265 resblks
= XFS_REMOVE_SPACE_RES(mp
);
1266 error
= xfs_trans_reserve(tp
, resblks
, XFS_REMOVE_LOG_RES(mp
), 0,
1267 XFS_TRANS_PERM_LOG_RES
, log_count
);
1268 if (error
== ENOSPC
) {
1270 error
= xfs_trans_reserve(tp
, 0, XFS_REMOVE_LOG_RES(mp
), 0,
1271 XFS_TRANS_PERM_LOG_RES
, log_count
);
1274 ASSERT(error
!= ENOSPC
);
1276 goto out_trans_cancel
;
1279 xfs_lock_two_inodes(dp
, ip
, XFS_ILOCK_EXCL
);
1281 xfs_trans_ijoin(tp
, dp
, XFS_ILOCK_EXCL
);
1282 xfs_trans_ijoin(tp
, ip
, XFS_ILOCK_EXCL
);
1285 * If we're removing a directory perform some additional validation.
1288 ASSERT(ip
->i_d
.di_nlink
>= 2);
1289 if (ip
->i_d
.di_nlink
!= 2) {
1290 error
= XFS_ERROR(ENOTEMPTY
);
1291 goto out_trans_cancel
;
1293 if (!xfs_dir_isempty(ip
)) {
1294 error
= XFS_ERROR(ENOTEMPTY
);
1295 goto out_trans_cancel
;
1299 xfs_bmap_init(&free_list
, &first_block
);
1300 error
= xfs_dir_removename(tp
, dp
, name
, ip
->i_ino
,
1301 &first_block
, &free_list
, resblks
);
1303 ASSERT(error
!= ENOENT
);
1304 goto out_bmap_cancel
;
1306 xfs_trans_ichgtime(tp
, dp
, XFS_ICHGTIME_MOD
| XFS_ICHGTIME_CHG
);
1310 * Drop the link from ip's "..".
1312 error
= xfs_droplink(tp
, dp
);
1314 goto out_bmap_cancel
;
1317 * Drop the "." link from ip to self.
1319 error
= xfs_droplink(tp
, ip
);
1321 goto out_bmap_cancel
;
1324 * When removing a non-directory we need to log the parent
1325 * inode here. For a directory this is done implicitly
1326 * by the xfs_droplink call for the ".." entry.
1328 xfs_trans_log_inode(tp
, dp
, XFS_ILOG_CORE
);
1332 * Drop the link from dp to ip.
1334 error
= xfs_droplink(tp
, ip
);
1336 goto out_bmap_cancel
;
1339 * Determine if this is the last link while
1340 * we are in the transaction.
1342 link_zero
= (ip
->i_d
.di_nlink
== 0);
1345 * If this is a synchronous mount, make sure that the
1346 * remove transaction goes to disk before returning to
1349 if (mp
->m_flags
& (XFS_MOUNT_WSYNC
|XFS_MOUNT_DIRSYNC
))
1350 xfs_trans_set_sync(tp
);
1352 error
= xfs_bmap_finish(&tp
, &free_list
, &committed
);
1354 goto out_bmap_cancel
;
1356 error
= xfs_trans_commit(tp
, XFS_TRANS_RELEASE_LOG_RES
);
1361 * If we are using filestreams, kill the stream association.
1362 * If the file is still open it may get a new one but that
1363 * will get killed on last close in xfs_close() so we don't
1364 * have to worry about that.
1366 if (!is_dir
&& link_zero
&& xfs_inode_is_filestream(ip
))
1367 xfs_filestream_deassociate(ip
);
1372 xfs_bmap_cancel(&free_list
);
1373 cancel_flags
|= XFS_TRANS_ABORT
;
1375 xfs_trans_cancel(tp
, cancel_flags
);
1384 struct xfs_name
*target_name
)
1386 xfs_mount_t
*mp
= tdp
->i_mount
;
1389 xfs_bmap_free_t free_list
;
1390 xfs_fsblock_t first_block
;
1395 trace_xfs_link(tdp
, target_name
);
1397 ASSERT(!S_ISDIR(sip
->i_d
.di_mode
));
1399 if (XFS_FORCED_SHUTDOWN(mp
))
1400 return XFS_ERROR(EIO
);
1402 error
= xfs_qm_dqattach(sip
, 0);
1406 error
= xfs_qm_dqattach(tdp
, 0);
1410 tp
= xfs_trans_alloc(mp
, XFS_TRANS_LINK
);
1411 cancel_flags
= XFS_TRANS_RELEASE_LOG_RES
;
1412 resblks
= XFS_LINK_SPACE_RES(mp
, target_name
->len
);
1413 error
= xfs_trans_reserve(tp
, resblks
, XFS_LINK_LOG_RES(mp
), 0,
1414 XFS_TRANS_PERM_LOG_RES
, XFS_LINK_LOG_COUNT
);
1415 if (error
== ENOSPC
) {
1417 error
= xfs_trans_reserve(tp
, 0, XFS_LINK_LOG_RES(mp
), 0,
1418 XFS_TRANS_PERM_LOG_RES
, XFS_LINK_LOG_COUNT
);
1425 xfs_lock_two_inodes(sip
, tdp
, XFS_ILOCK_EXCL
);
1427 xfs_trans_ijoin(tp
, sip
, XFS_ILOCK_EXCL
);
1428 xfs_trans_ijoin(tp
, tdp
, XFS_ILOCK_EXCL
);
1431 * If the source has too many links, we can't make any more to it.
1433 if (sip
->i_d
.di_nlink
>= XFS_MAXLINK
) {
1434 error
= XFS_ERROR(EMLINK
);
1439 * If we are using project inheritance, we only allow hard link
1440 * creation in our tree when the project IDs are the same; else
1441 * the tree quota mechanism could be circumvented.
1443 if (unlikely((tdp
->i_d
.di_flags
& XFS_DIFLAG_PROJINHERIT
) &&
1444 (xfs_get_projid(tdp
) != xfs_get_projid(sip
)))) {
1445 error
= XFS_ERROR(EXDEV
);
1449 error
= xfs_dir_canenter(tp
, tdp
, target_name
, resblks
);
1453 xfs_bmap_init(&free_list
, &first_block
);
1455 error
= xfs_dir_createname(tp
, tdp
, target_name
, sip
->i_ino
,
1456 &first_block
, &free_list
, resblks
);
1459 xfs_trans_ichgtime(tp
, tdp
, XFS_ICHGTIME_MOD
| XFS_ICHGTIME_CHG
);
1460 xfs_trans_log_inode(tp
, tdp
, XFS_ILOG_CORE
);
1462 error
= xfs_bumplink(tp
, sip
);
1467 * If this is a synchronous mount, make sure that the
1468 * link transaction goes to disk before returning to
1471 if (mp
->m_flags
& (XFS_MOUNT_WSYNC
|XFS_MOUNT_DIRSYNC
)) {
1472 xfs_trans_set_sync(tp
);
1475 error
= xfs_bmap_finish (&tp
, &free_list
, &committed
);
1477 xfs_bmap_cancel(&free_list
);
1481 return xfs_trans_commit(tp
, XFS_TRANS_RELEASE_LOG_RES
);
1484 cancel_flags
|= XFS_TRANS_ABORT
;
1486 xfs_trans_cancel(tp
, cancel_flags
);
1494 struct xfs_name
*link_name
,
1495 const char *target_path
,
1499 xfs_mount_t
*mp
= dp
->i_mount
;
1504 xfs_bmap_free_t free_list
;
1505 xfs_fsblock_t first_block
;
1506 boolean_t unlock_dp_on_error
= B_FALSE
;
1509 xfs_fileoff_t first_fsb
;
1510 xfs_filblks_t fs_blocks
;
1512 xfs_bmbt_irec_t mval
[SYMLINK_MAPS
];
1514 const char *cur_chunk
;
1519 struct xfs_dquot
*udqp
, *gdqp
;
1527 trace_xfs_symlink(dp
, link_name
);
1529 if (XFS_FORCED_SHUTDOWN(mp
))
1530 return XFS_ERROR(EIO
);
1533 * Check component lengths of the target path name.
1535 pathlen
= strlen(target_path
);
1536 if (pathlen
>= MAXPATHLEN
) /* total string too long */
1537 return XFS_ERROR(ENAMETOOLONG
);
1540 if (dp
->i_d
.di_flags
& XFS_DIFLAG_PROJINHERIT
)
1541 prid
= xfs_get_projid(dp
);
1543 prid
= XFS_PROJID_DEFAULT
;
1546 * Make sure that we have allocated dquot(s) on disk.
1548 error
= xfs_qm_vop_dqalloc(dp
, current_fsuid(), current_fsgid(), prid
,
1549 XFS_QMOPT_QUOTALL
| XFS_QMOPT_INHERIT
, &udqp
, &gdqp
);
1553 tp
= xfs_trans_alloc(mp
, XFS_TRANS_SYMLINK
);
1554 cancel_flags
= XFS_TRANS_RELEASE_LOG_RES
;
1556 * The symlink will fit into the inode data fork?
1557 * There can't be any attributes so we get the whole variable part.
1559 if (pathlen
<= XFS_LITINO(mp
))
1562 fs_blocks
= XFS_B_TO_FSB(mp
, pathlen
);
1563 resblks
= XFS_SYMLINK_SPACE_RES(mp
, link_name
->len
, fs_blocks
);
1564 error
= xfs_trans_reserve(tp
, resblks
, XFS_SYMLINK_LOG_RES(mp
), 0,
1565 XFS_TRANS_PERM_LOG_RES
, XFS_SYMLINK_LOG_COUNT
);
1566 if (error
== ENOSPC
&& fs_blocks
== 0) {
1568 error
= xfs_trans_reserve(tp
, 0, XFS_SYMLINK_LOG_RES(mp
), 0,
1569 XFS_TRANS_PERM_LOG_RES
, XFS_SYMLINK_LOG_COUNT
);
1576 xfs_ilock(dp
, XFS_ILOCK_EXCL
| XFS_ILOCK_PARENT
);
1577 unlock_dp_on_error
= B_TRUE
;
1580 * Check whether the directory allows new symlinks or not.
1582 if (dp
->i_d
.di_flags
& XFS_DIFLAG_NOSYMLINKS
) {
1583 error
= XFS_ERROR(EPERM
);
1588 * Reserve disk quota : blocks and inode.
1590 error
= xfs_trans_reserve_quota(tp
, mp
, udqp
, gdqp
, resblks
, 1, 0);
1595 * Check for ability to enter directory entry, if no space reserved.
1597 error
= xfs_dir_canenter(tp
, dp
, link_name
, resblks
);
1601 * Initialize the bmap freelist prior to calling either
1602 * bmapi or the directory create code.
1604 xfs_bmap_init(&free_list
, &first_block
);
1607 * Allocate an inode for the symlink.
1609 error
= xfs_dir_ialloc(&tp
, dp
, S_IFLNK
| (mode
& ~S_IFMT
), 1, 0,
1610 prid
, resblks
> 0, &ip
, NULL
);
1612 if (error
== ENOSPC
)
1618 * An error after we've joined dp to the transaction will result in the
1619 * transaction cancel unlocking dp so don't do it explicitly in the
1622 xfs_trans_ijoin(tp
, dp
, XFS_ILOCK_EXCL
);
1623 unlock_dp_on_error
= B_FALSE
;
1626 * Also attach the dquot(s) to it, if applicable.
1628 xfs_qm_vop_create_dqattach(tp
, ip
, udqp
, gdqp
);
1631 resblks
-= XFS_IALLOC_SPACE_RES(mp
);
1633 * If the symlink will fit into the inode, write it inline.
1635 if (pathlen
<= XFS_IFORK_DSIZE(ip
)) {
1636 xfs_idata_realloc(ip
, pathlen
, XFS_DATA_FORK
);
1637 memcpy(ip
->i_df
.if_u1
.if_data
, target_path
, pathlen
);
1638 ip
->i_d
.di_size
= pathlen
;
1641 * The inode was initially created in extent format.
1643 ip
->i_df
.if_flags
&= ~(XFS_IFEXTENTS
| XFS_IFBROOT
);
1644 ip
->i_df
.if_flags
|= XFS_IFINLINE
;
1646 ip
->i_d
.di_format
= XFS_DINODE_FMT_LOCAL
;
1647 xfs_trans_log_inode(tp
, ip
, XFS_ILOG_DDATA
| XFS_ILOG_CORE
);
1651 nmaps
= SYMLINK_MAPS
;
1653 error
= xfs_bmapi_write(tp
, ip
, first_fsb
, fs_blocks
,
1654 XFS_BMAPI_METADATA
, &first_block
, resblks
,
1655 mval
, &nmaps
, &free_list
);
1660 resblks
-= fs_blocks
;
1661 ip
->i_d
.di_size
= pathlen
;
1662 xfs_trans_log_inode(tp
, ip
, XFS_ILOG_CORE
);
1664 cur_chunk
= target_path
;
1665 for (n
= 0; n
< nmaps
; n
++) {
1666 d
= XFS_FSB_TO_DADDR(mp
, mval
[n
].br_startblock
);
1667 byte_cnt
= XFS_FSB_TO_B(mp
, mval
[n
].br_blockcount
);
1668 bp
= xfs_trans_get_buf(tp
, mp
->m_ddev_targp
, d
,
1669 BTOBB(byte_cnt
), 0);
1674 if (pathlen
< byte_cnt
) {
1677 pathlen
-= byte_cnt
;
1679 memcpy(bp
->b_addr
, cur_chunk
, byte_cnt
);
1680 cur_chunk
+= byte_cnt
;
1682 xfs_trans_log_buf(tp
, bp
, 0, byte_cnt
- 1);
1687 * Create the directory entry for the symlink.
1689 error
= xfs_dir_createname(tp
, dp
, link_name
, ip
->i_ino
,
1690 &first_block
, &free_list
, resblks
);
1693 xfs_trans_ichgtime(tp
, dp
, XFS_ICHGTIME_MOD
| XFS_ICHGTIME_CHG
);
1694 xfs_trans_log_inode(tp
, dp
, XFS_ILOG_CORE
);
1697 * If this is a synchronous mount, make sure that the
1698 * symlink transaction goes to disk before returning to
1701 if (mp
->m_flags
& (XFS_MOUNT_WSYNC
|XFS_MOUNT_DIRSYNC
)) {
1702 xfs_trans_set_sync(tp
);
1705 error
= xfs_bmap_finish(&tp
, &free_list
, &committed
);
1709 error
= xfs_trans_commit(tp
, XFS_TRANS_RELEASE_LOG_RES
);
1710 xfs_qm_dqrele(udqp
);
1711 xfs_qm_dqrele(gdqp
);
1719 xfs_bmap_cancel(&free_list
);
1720 cancel_flags
|= XFS_TRANS_ABORT
;
1722 xfs_trans_cancel(tp
, cancel_flags
);
1723 xfs_qm_dqrele(udqp
);
1724 xfs_qm_dqrele(gdqp
);
1726 if (unlock_dp_on_error
)
1727 xfs_iunlock(dp
, XFS_ILOCK_EXCL
);
1738 xfs_mount_t
*mp
= ip
->i_mount
;
1742 if (!capable(CAP_SYS_ADMIN
))
1743 return XFS_ERROR(EPERM
);
1745 if (XFS_FORCED_SHUTDOWN(mp
))
1746 return XFS_ERROR(EIO
);
1748 tp
= xfs_trans_alloc(mp
, XFS_TRANS_SET_DMATTRS
);
1749 error
= xfs_trans_reserve(tp
, 0, XFS_ICHANGE_LOG_RES (mp
), 0, 0, 0);
1751 xfs_trans_cancel(tp
, 0);
1754 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
1755 xfs_trans_ijoin(tp
, ip
, XFS_ILOCK_EXCL
);
1757 ip
->i_d
.di_dmevmask
= evmask
;
1758 ip
->i_d
.di_dmstate
= state
;
1760 xfs_trans_log_inode(tp
, ip
, XFS_ILOG_CORE
);
1761 error
= xfs_trans_commit(tp
, 0);
1767 * xfs_alloc_file_space()
1768 * This routine allocates disk space for the given file.
1770 * If alloc_type == 0, this request is for an ALLOCSP type
1771 * request which will change the file size. In this case, no
1772 * DMAPI event will be generated by the call. A TRUNCATE event
1773 * will be generated later by xfs_setattr.
1775 * If alloc_type != 0, this request is for a RESVSP type
1776 * request, and a DMAPI DM_EVENT_WRITE will be generated if the
1777 * lower block boundary byte address is less than the file's
1786 xfs_alloc_file_space(
1793 xfs_mount_t
*mp
= ip
->i_mount
;
1795 xfs_filblks_t allocated_fsb
;
1796 xfs_filblks_t allocatesize_fsb
;
1797 xfs_extlen_t extsz
, temp
;
1798 xfs_fileoff_t startoffset_fsb
;
1799 xfs_fsblock_t firstfsb
;
1804 xfs_bmbt_irec_t imaps
[1], *imapp
;
1805 xfs_bmap_free_t free_list
;
1806 uint qblocks
, resblks
, resrtextents
;
1810 trace_xfs_alloc_file_space(ip
);
1812 if (XFS_FORCED_SHUTDOWN(mp
))
1813 return XFS_ERROR(EIO
);
1815 error
= xfs_qm_dqattach(ip
, 0);
1820 return XFS_ERROR(EINVAL
);
1822 rt
= XFS_IS_REALTIME_INODE(ip
);
1823 extsz
= xfs_get_extsz_hint(ip
);
1828 startoffset_fsb
= XFS_B_TO_FSBT(mp
, offset
);
1829 allocatesize_fsb
= XFS_B_TO_FSB(mp
, count
);
1832 * Allocate file space until done or until there is an error
1834 while (allocatesize_fsb
&& !error
) {
1838 * Determine space reservations for data/realtime.
1840 if (unlikely(extsz
)) {
1841 s
= startoffset_fsb
;
1844 e
= startoffset_fsb
+ allocatesize_fsb
;
1845 if ((temp
= do_mod(startoffset_fsb
, extsz
)))
1847 if ((temp
= do_mod(e
, extsz
)))
1851 e
= allocatesize_fsb
;
1855 * The transaction reservation is limited to a 32-bit block
1856 * count, hence we need to limit the number of blocks we are
1857 * trying to reserve to avoid an overflow. We can't allocate
1858 * more than @nimaps extents, and an extent is limited on disk
1859 * to MAXEXTLEN (21 bits), so use that to enforce the limit.
1861 resblks
= min_t(xfs_fileoff_t
, (e
- s
), (MAXEXTLEN
* nimaps
));
1863 resrtextents
= qblocks
= resblks
;
1864 resrtextents
/= mp
->m_sb
.sb_rextsize
;
1865 resblks
= XFS_DIOSTRAT_SPACE_RES(mp
, 0);
1866 quota_flag
= XFS_QMOPT_RES_RTBLKS
;
1869 resblks
= qblocks
= XFS_DIOSTRAT_SPACE_RES(mp
, resblks
);
1870 quota_flag
= XFS_QMOPT_RES_REGBLKS
;
1874 * Allocate and setup the transaction.
1876 tp
= xfs_trans_alloc(mp
, XFS_TRANS_DIOSTRAT
);
1877 error
= xfs_trans_reserve(tp
, resblks
,
1878 XFS_WRITE_LOG_RES(mp
), resrtextents
,
1879 XFS_TRANS_PERM_LOG_RES
,
1880 XFS_WRITE_LOG_COUNT
);
1882 * Check for running out of space
1886 * Free the transaction structure.
1888 ASSERT(error
== ENOSPC
|| XFS_FORCED_SHUTDOWN(mp
));
1889 xfs_trans_cancel(tp
, 0);
1892 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
1893 error
= xfs_trans_reserve_quota_nblks(tp
, ip
, qblocks
,
1898 xfs_trans_ijoin(tp
, ip
, 0);
1900 xfs_bmap_init(&free_list
, &firstfsb
);
1901 error
= xfs_bmapi_write(tp
, ip
, startoffset_fsb
,
1902 allocatesize_fsb
, alloc_type
, &firstfsb
,
1903 0, imapp
, &nimaps
, &free_list
);
1909 * Complete the transaction
1911 error
= xfs_bmap_finish(&tp
, &free_list
, &committed
);
1916 error
= xfs_trans_commit(tp
, XFS_TRANS_RELEASE_LOG_RES
);
1917 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
1922 allocated_fsb
= imapp
->br_blockcount
;
1925 error
= XFS_ERROR(ENOSPC
);
1929 startoffset_fsb
+= allocated_fsb
;
1930 allocatesize_fsb
-= allocated_fsb
;
1935 error0
: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */
1936 xfs_bmap_cancel(&free_list
);
1937 xfs_trans_unreserve_quota_nblks(tp
, ip
, qblocks
, 0, quota_flag
);
1939 error1
: /* Just cancel transaction */
1940 xfs_trans_cancel(tp
, XFS_TRANS_RELEASE_LOG_RES
| XFS_TRANS_ABORT
);
1941 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
1946 * Zero file bytes between startoff and endoff inclusive.
1947 * The iolock is held exclusive and no blocks are buffered.
1949 * This function is used by xfs_free_file_space() to zero
1950 * partial blocks when the range to free is not block aligned.
1951 * When unreserving space with boundaries that are not block
1952 * aligned we round up the start and round down the end
1953 * boundaries and then use this function to zero the parts of
1954 * the blocks that got dropped during the rounding.
1957 xfs_zero_remaining_bytes(
1962 xfs_bmbt_irec_t imap
;
1963 xfs_fileoff_t offset_fsb
;
1964 xfs_off_t lastoffset
;
1967 xfs_mount_t
*mp
= ip
->i_mount
;
1972 * Avoid doing I/O beyond eof - it's not necessary
1973 * since nothing can read beyond eof. The space will
1974 * be zeroed when the file is extended anyway.
1976 if (startoff
>= XFS_ISIZE(ip
))
1979 if (endoff
> XFS_ISIZE(ip
))
1980 endoff
= XFS_ISIZE(ip
);
1982 bp
= xfs_buf_get_uncached(XFS_IS_REALTIME_INODE(ip
) ?
1983 mp
->m_rtdev_targp
: mp
->m_ddev_targp
,
1984 mp
->m_sb
.sb_blocksize
, XBF_DONT_BLOCK
);
1986 return XFS_ERROR(ENOMEM
);
1990 for (offset
= startoff
; offset
<= endoff
; offset
= lastoffset
+ 1) {
1991 offset_fsb
= XFS_B_TO_FSBT(mp
, offset
);
1993 error
= xfs_bmapi_read(ip
, offset_fsb
, 1, &imap
, &nimap
, 0);
1994 if (error
|| nimap
< 1)
1996 ASSERT(imap
.br_blockcount
>= 1);
1997 ASSERT(imap
.br_startoff
== offset_fsb
);
1998 lastoffset
= XFS_FSB_TO_B(mp
, imap
.br_startoff
+ 1) - 1;
1999 if (lastoffset
> endoff
)
2000 lastoffset
= endoff
;
2001 if (imap
.br_startblock
== HOLESTARTBLOCK
)
2003 ASSERT(imap
.br_startblock
!= DELAYSTARTBLOCK
);
2004 if (imap
.br_state
== XFS_EXT_UNWRITTEN
)
2007 XFS_BUF_UNWRITE(bp
);
2009 XFS_BUF_SET_ADDR(bp
, xfs_fsb_to_db(ip
, imap
.br_startblock
));
2011 error
= xfs_buf_iowait(bp
);
2013 xfs_buf_ioerror_alert(bp
,
2014 "xfs_zero_remaining_bytes(read)");
2018 (offset
- XFS_FSB_TO_B(mp
, imap
.br_startoff
)),
2019 0, lastoffset
- offset
+ 1);
2024 error
= xfs_buf_iowait(bp
);
2026 xfs_buf_ioerror_alert(bp
,
2027 "xfs_zero_remaining_bytes(write)");
2036 * xfs_free_file_space()
2037 * This routine frees disk space for the given file.
2039 * This routine is only called by xfs_change_file_space
2040 * for an UNRESVSP type call.
2048 xfs_free_file_space(
2056 xfs_fileoff_t endoffset_fsb
;
2058 xfs_fsblock_t firstfsb
;
2059 xfs_bmap_free_t free_list
;
2060 xfs_bmbt_irec_t imap
;
2068 xfs_fileoff_t startoffset_fsb
;
2070 int need_iolock
= 1;
2074 trace_xfs_free_file_space(ip
);
2076 error
= xfs_qm_dqattach(ip
, 0);
2081 if (len
<= 0) /* if nothing being freed */
2083 rt
= XFS_IS_REALTIME_INODE(ip
);
2084 startoffset_fsb
= XFS_B_TO_FSB(mp
, offset
);
2085 endoffset_fsb
= XFS_B_TO_FSBT(mp
, offset
+ len
);
2087 if (attr_flags
& XFS_ATTR_NOLOCK
)
2090 xfs_ilock(ip
, XFS_IOLOCK_EXCL
);
2091 /* wait for the completion of any pending DIOs */
2092 inode_dio_wait(VFS_I(ip
));
2095 rounding
= max_t(uint
, 1 << mp
->m_sb
.sb_blocklog
, PAGE_CACHE_SIZE
);
2096 ioffset
= offset
& ~(rounding
- 1);
2098 if (VN_CACHED(VFS_I(ip
)) != 0) {
2099 error
= xfs_flushinval_pages(ip
, ioffset
, -1, FI_REMAPF_LOCKED
);
2101 goto out_unlock_iolock
;
2105 * Need to zero the stuff we're not freeing, on disk.
2106 * If it's a realtime file & can't use unwritten extents then we
2107 * actually need to zero the extent edges. Otherwise xfs_bunmapi
2108 * will take care of it for us.
2110 if (rt
&& !xfs_sb_version_hasextflgbit(&mp
->m_sb
)) {
2112 error
= xfs_bmapi_read(ip
, startoffset_fsb
, 1,
2115 goto out_unlock_iolock
;
2116 ASSERT(nimap
== 0 || nimap
== 1);
2117 if (nimap
&& imap
.br_startblock
!= HOLESTARTBLOCK
) {
2120 ASSERT(imap
.br_startblock
!= DELAYSTARTBLOCK
);
2121 block
= imap
.br_startblock
;
2122 mod
= do_div(block
, mp
->m_sb
.sb_rextsize
);
2124 startoffset_fsb
+= mp
->m_sb
.sb_rextsize
- mod
;
2127 error
= xfs_bmapi_read(ip
, endoffset_fsb
- 1, 1,
2130 goto out_unlock_iolock
;
2131 ASSERT(nimap
== 0 || nimap
== 1);
2132 if (nimap
&& imap
.br_startblock
!= HOLESTARTBLOCK
) {
2133 ASSERT(imap
.br_startblock
!= DELAYSTARTBLOCK
);
2135 if (mod
&& (mod
!= mp
->m_sb
.sb_rextsize
))
2136 endoffset_fsb
-= mod
;
2139 if ((done
= (endoffset_fsb
<= startoffset_fsb
)))
2141 * One contiguous piece to clear
2143 error
= xfs_zero_remaining_bytes(ip
, offset
, offset
+ len
- 1);
2146 * Some full blocks, possibly two pieces to clear
2148 if (offset
< XFS_FSB_TO_B(mp
, startoffset_fsb
))
2149 error
= xfs_zero_remaining_bytes(ip
, offset
,
2150 XFS_FSB_TO_B(mp
, startoffset_fsb
) - 1);
2152 XFS_FSB_TO_B(mp
, endoffset_fsb
) < offset
+ len
)
2153 error
= xfs_zero_remaining_bytes(ip
,
2154 XFS_FSB_TO_B(mp
, endoffset_fsb
),
2159 * free file space until done or until there is an error
2161 resblks
= XFS_DIOSTRAT_SPACE_RES(mp
, 0);
2162 while (!error
&& !done
) {
2165 * allocate and setup the transaction. Allow this
2166 * transaction to dip into the reserve blocks to ensure
2167 * the freeing of the space succeeds at ENOSPC.
2169 tp
= xfs_trans_alloc(mp
, XFS_TRANS_DIOSTRAT
);
2170 tp
->t_flags
|= XFS_TRANS_RESERVE
;
2171 error
= xfs_trans_reserve(tp
,
2173 XFS_WRITE_LOG_RES(mp
),
2175 XFS_TRANS_PERM_LOG_RES
,
2176 XFS_WRITE_LOG_COUNT
);
2179 * check for running out of space
2183 * Free the transaction structure.
2185 ASSERT(error
== ENOSPC
|| XFS_FORCED_SHUTDOWN(mp
));
2186 xfs_trans_cancel(tp
, 0);
2189 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
2190 error
= xfs_trans_reserve_quota(tp
, mp
,
2191 ip
->i_udquot
, ip
->i_gdquot
,
2192 resblks
, 0, XFS_QMOPT_RES_REGBLKS
);
2196 xfs_trans_ijoin(tp
, ip
, 0);
2199 * issue the bunmapi() call to free the blocks
2201 xfs_bmap_init(&free_list
, &firstfsb
);
2202 error
= xfs_bunmapi(tp
, ip
, startoffset_fsb
,
2203 endoffset_fsb
- startoffset_fsb
,
2204 0, 2, &firstfsb
, &free_list
, &done
);
2210 * complete the transaction
2212 error
= xfs_bmap_finish(&tp
, &free_list
, &committed
);
2217 error
= xfs_trans_commit(tp
, XFS_TRANS_RELEASE_LOG_RES
);
2218 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
2223 xfs_iunlock(ip
, XFS_IOLOCK_EXCL
);
2227 xfs_bmap_cancel(&free_list
);
2229 xfs_trans_cancel(tp
, XFS_TRANS_RELEASE_LOG_RES
| XFS_TRANS_ABORT
);
2230 xfs_iunlock(ip
, need_iolock
? (XFS_ILOCK_EXCL
| XFS_IOLOCK_EXCL
) :
2236 * xfs_change_file_space()
2237 * This routine allocates or frees disk space for the given file.
2238 * The user specified parameters are checked for alignment and size
2247 xfs_change_file_space(
2254 xfs_mount_t
*mp
= ip
->i_mount
;
2259 xfs_off_t startoffset
;
2265 if (!S_ISREG(ip
->i_d
.di_mode
))
2266 return XFS_ERROR(EINVAL
);
2268 switch (bf
->l_whence
) {
2269 case 0: /*SEEK_SET*/
2271 case 1: /*SEEK_CUR*/
2272 bf
->l_start
+= offset
;
2274 case 2: /*SEEK_END*/
2275 bf
->l_start
+= XFS_ISIZE(ip
);
2278 return XFS_ERROR(EINVAL
);
2281 llen
= bf
->l_len
> 0 ? bf
->l_len
- 1 : bf
->l_len
;
2283 if ( (bf
->l_start
< 0)
2284 || (bf
->l_start
> XFS_MAXIOFFSET(mp
))
2285 || (bf
->l_start
+ llen
< 0)
2286 || (bf
->l_start
+ llen
> XFS_MAXIOFFSET(mp
)))
2287 return XFS_ERROR(EINVAL
);
2291 startoffset
= bf
->l_start
;
2292 fsize
= XFS_ISIZE(ip
);
2295 * XFS_IOC_RESVSP and XFS_IOC_UNRESVSP will reserve or unreserve
2297 * These calls do NOT zero the data space allocated to the file,
2298 * nor do they change the file size.
2300 * XFS_IOC_ALLOCSP and XFS_IOC_FREESP will allocate and free file
2302 * These calls cause the new file data to be zeroed and the file
2303 * size to be changed.
2305 setprealloc
= clrprealloc
= 0;
2306 prealloc_type
= XFS_BMAPI_PREALLOC
;
2309 case XFS_IOC_ZERO_RANGE
:
2310 prealloc_type
|= XFS_BMAPI_CONVERT
;
2311 xfs_tosspages(ip
, startoffset
, startoffset
+ bf
->l_len
, 0);
2313 case XFS_IOC_RESVSP
:
2314 case XFS_IOC_RESVSP64
:
2315 error
= xfs_alloc_file_space(ip
, startoffset
, bf
->l_len
,
2316 prealloc_type
, attr_flags
);
2322 case XFS_IOC_UNRESVSP
:
2323 case XFS_IOC_UNRESVSP64
:
2324 if ((error
= xfs_free_file_space(ip
, startoffset
, bf
->l_len
,
2329 case XFS_IOC_ALLOCSP
:
2330 case XFS_IOC_ALLOCSP64
:
2331 case XFS_IOC_FREESP
:
2332 case XFS_IOC_FREESP64
:
2333 if (startoffset
> fsize
) {
2334 error
= xfs_alloc_file_space(ip
, fsize
,
2335 startoffset
- fsize
, 0, attr_flags
);
2340 iattr
.ia_valid
= ATTR_SIZE
;
2341 iattr
.ia_size
= startoffset
;
2343 error
= xfs_setattr_size(ip
, &iattr
, attr_flags
);
2353 return XFS_ERROR(EINVAL
);
2357 * update the inode timestamp, mode, and prealloc flag bits
2359 tp
= xfs_trans_alloc(mp
, XFS_TRANS_WRITEID
);
2361 if ((error
= xfs_trans_reserve(tp
, 0, XFS_WRITEID_LOG_RES(mp
),
2364 xfs_trans_cancel(tp
, 0);
2368 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
2369 xfs_trans_ijoin(tp
, ip
, XFS_ILOCK_EXCL
);
2371 if ((attr_flags
& XFS_ATTR_DMI
) == 0) {
2372 ip
->i_d
.di_mode
&= ~S_ISUID
;
2375 * Note that we don't have to worry about mandatory
2376 * file locking being disabled here because we only
2377 * clear the S_ISGID bit if the Group execute bit is
2378 * on, but if it was on then mandatory locking wouldn't
2379 * have been enabled.
2381 if (ip
->i_d
.di_mode
& S_IXGRP
)
2382 ip
->i_d
.di_mode
&= ~S_ISGID
;
2384 xfs_trans_ichgtime(tp
, ip
, XFS_ICHGTIME_MOD
| XFS_ICHGTIME_CHG
);
2387 ip
->i_d
.di_flags
|= XFS_DIFLAG_PREALLOC
;
2388 else if (clrprealloc
)
2389 ip
->i_d
.di_flags
&= ~XFS_DIFLAG_PREALLOC
;
2391 xfs_trans_log_inode(tp
, ip
, XFS_ILOG_CORE
);
2392 if (attr_flags
& XFS_ATTR_SYNC
)
2393 xfs_trans_set_sync(tp
);
2394 return xfs_trans_commit(tp
, 0);