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_ioerror_alert("xfs_readlink",
91 ip
->i_mount
, bp
, XFS_BUF_ADDR(bp
));
95 if (pathlen
< byte_cnt
)
99 memcpy(link
, bp
->b_addr
, byte_cnt
);
103 link
[ip
->i_d
.di_size
] = '\0';
115 xfs_mount_t
*mp
= ip
->i_mount
;
119 trace_xfs_readlink(ip
);
121 if (XFS_FORCED_SHUTDOWN(mp
))
122 return XFS_ERROR(EIO
);
124 xfs_ilock(ip
, XFS_ILOCK_SHARED
);
126 ASSERT(S_ISLNK(ip
->i_d
.di_mode
));
127 ASSERT(ip
->i_d
.di_size
<= MAXPATHLEN
);
129 pathlen
= ip
->i_d
.di_size
;
133 if (ip
->i_df
.if_flags
& XFS_IFINLINE
) {
134 memcpy(link
, ip
->i_df
.if_u1
.if_data
, pathlen
);
135 link
[pathlen
] = '\0';
137 error
= xfs_readlink_bmap(ip
, link
);
141 xfs_iunlock(ip
, XFS_ILOCK_SHARED
);
146 * Flags for xfs_free_eofblocks
148 #define XFS_FREE_EOF_TRYLOCK (1<<0)
151 * This is called by xfs_inactive to free any blocks beyond eof
152 * when the link count isn't zero and by xfs_dm_punch_hole() when
153 * punching a hole to EOF.
163 xfs_fileoff_t end_fsb
;
164 xfs_fileoff_t last_fsb
;
165 xfs_filblks_t map_len
;
167 xfs_bmbt_irec_t imap
;
170 * Figure out if there are any blocks beyond the end
171 * of the file. If not, then there is nothing to do.
173 end_fsb
= XFS_B_TO_FSB(mp
, ((xfs_ufsize_t
)ip
->i_size
));
174 last_fsb
= XFS_B_TO_FSB(mp
, (xfs_ufsize_t
)XFS_MAXIOFFSET(mp
));
175 if (last_fsb
<= end_fsb
)
177 map_len
= last_fsb
- end_fsb
;
180 xfs_ilock(ip
, XFS_ILOCK_SHARED
);
181 error
= xfs_bmapi_read(ip
, end_fsb
, map_len
, &imap
, &nimaps
, 0);
182 xfs_iunlock(ip
, XFS_ILOCK_SHARED
);
184 if (!error
&& (nimaps
!= 0) &&
185 (imap
.br_startblock
!= HOLESTARTBLOCK
||
186 ip
->i_delayed_blks
)) {
188 * Attach the dquots to the inode up front.
190 error
= xfs_qm_dqattach(ip
, 0);
195 * There are blocks after the end of file.
196 * Free them up now by truncating the file to
199 tp
= xfs_trans_alloc(mp
, XFS_TRANS_INACTIVE
);
201 if (flags
& XFS_FREE_EOF_TRYLOCK
) {
202 if (!xfs_ilock_nowait(ip
, XFS_IOLOCK_EXCL
)) {
203 xfs_trans_cancel(tp
, 0);
207 xfs_ilock(ip
, XFS_IOLOCK_EXCL
);
210 error
= xfs_trans_reserve(tp
, 0,
211 XFS_ITRUNCATE_LOG_RES(mp
),
212 0, XFS_TRANS_PERM_LOG_RES
,
213 XFS_ITRUNCATE_LOG_COUNT
);
215 ASSERT(XFS_FORCED_SHUTDOWN(mp
));
216 xfs_trans_cancel(tp
, 0);
217 xfs_iunlock(ip
, XFS_IOLOCK_EXCL
);
221 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
222 xfs_trans_ijoin(tp
, ip
, 0);
224 error
= xfs_itruncate_data(&tp
, ip
, ip
->i_size
);
227 * If we get an error at this point we simply don't
228 * bother truncating the file.
231 (XFS_TRANS_RELEASE_LOG_RES
|
234 error
= xfs_trans_commit(tp
,
235 XFS_TRANS_RELEASE_LOG_RES
);
237 xfs_iunlock(ip
, XFS_IOLOCK_EXCL
|XFS_ILOCK_EXCL
);
243 * Free a symlink that has blocks associated with it.
246 xfs_inactive_symlink_rmt(
254 xfs_fsblock_t first_block
;
255 xfs_bmap_free_t free_list
;
258 xfs_bmbt_irec_t mval
[SYMLINK_MAPS
];
266 ASSERT(ip
->i_d
.di_size
> XFS_IFORK_DSIZE(ip
));
268 * We're freeing a symlink that has some
269 * blocks allocated to it. Free the
270 * blocks here. We know that we've got
271 * either 1 or 2 extents and that we can
272 * free them all in one bunmapi call.
274 ASSERT(ip
->i_d
.di_nextents
> 0 && ip
->i_d
.di_nextents
<= 2);
275 if ((error
= xfs_trans_reserve(tp
, 0, XFS_ITRUNCATE_LOG_RES(mp
), 0,
276 XFS_TRANS_PERM_LOG_RES
, XFS_ITRUNCATE_LOG_COUNT
))) {
277 ASSERT(XFS_FORCED_SHUTDOWN(mp
));
278 xfs_trans_cancel(tp
, 0);
283 * Lock the inode, fix the size, and join it to the transaction.
284 * Hold it so in the normal path, we still have it locked for
285 * the second transaction. In the error paths we need it
286 * held so the cancel won't rele it, see below.
288 xfs_ilock(ip
, XFS_IOLOCK_EXCL
| XFS_ILOCK_EXCL
);
289 size
= (int)ip
->i_d
.di_size
;
291 xfs_trans_ijoin(tp
, ip
, 0);
292 xfs_trans_log_inode(tp
, ip
, XFS_ILOG_CORE
);
294 * Find the block(s) so we can inval and unmap them.
297 xfs_bmap_init(&free_list
, &first_block
);
298 nmaps
= ARRAY_SIZE(mval
);
299 error
= xfs_bmapi_read(ip
, 0, XFS_B_TO_FSB(mp
, size
),
304 * Invalidate the block(s).
306 for (i
= 0; i
< nmaps
; i
++) {
307 bp
= xfs_trans_get_buf(tp
, mp
->m_ddev_targp
,
308 XFS_FSB_TO_DADDR(mp
, mval
[i
].br_startblock
),
309 XFS_FSB_TO_BB(mp
, mval
[i
].br_blockcount
), 0);
314 xfs_trans_binval(tp
, bp
);
317 * Unmap the dead block(s) to the free_list.
319 if ((error
= xfs_bunmapi(tp
, ip
, 0, size
, XFS_BMAPI_METADATA
, nmaps
,
320 &first_block
, &free_list
, &done
)))
324 * Commit the first transaction. This logs the EFI and the inode.
326 if ((error
= xfs_bmap_finish(&tp
, &free_list
, &committed
)))
329 * The transaction must have been committed, since there were
330 * actually extents freed by xfs_bunmapi. See xfs_bmap_finish.
331 * The new tp has the extent freeing and EFDs.
335 * The first xact was committed, so add the inode to the new one.
336 * Mark it dirty so it will be logged and moved forward in the log as
337 * part of every commit.
339 xfs_trans_ijoin(tp
, ip
, 0);
340 xfs_trans_log_inode(tp
, ip
, XFS_ILOG_CORE
);
342 * Get a new, empty transaction to return to our caller.
344 ntp
= xfs_trans_dup(tp
);
346 * Commit the transaction containing extent freeing and EFDs.
347 * If we get an error on the commit here or on the reserve below,
348 * we need to unlock the inode since the new transaction doesn't
349 * have the inode attached.
351 error
= xfs_trans_commit(tp
, 0);
354 ASSERT(XFS_FORCED_SHUTDOWN(mp
));
358 * transaction commit worked ok so we can drop the extra ticket
359 * reference that we gained in xfs_trans_dup()
361 xfs_log_ticket_put(tp
->t_ticket
);
364 * Remove the memory for extent descriptions (just bookkeeping).
366 if (ip
->i_df
.if_bytes
)
367 xfs_idata_realloc(ip
, -ip
->i_df
.if_bytes
, XFS_DATA_FORK
);
368 ASSERT(ip
->i_df
.if_bytes
== 0);
370 * Put an itruncate log reservation in the new transaction
373 if ((error
= xfs_trans_reserve(tp
, 0, XFS_ITRUNCATE_LOG_RES(mp
), 0,
374 XFS_TRANS_PERM_LOG_RES
, XFS_ITRUNCATE_LOG_COUNT
))) {
375 ASSERT(XFS_FORCED_SHUTDOWN(mp
));
379 * Return with the inode locked but not joined to the transaction.
385 xfs_bmap_cancel(&free_list
);
388 * Have to come here with the inode locked and either
389 * (held and in the transaction) or (not in the transaction).
390 * If the inode isn't held then cancel would iput it, but
391 * that's wrong since this is inactive and the vnode ref
392 * count is 0 already.
393 * Cancel won't do anything to the inode if held, but it still
394 * needs to be locked until the cancel is done, if it was
395 * joined to the transaction.
397 xfs_trans_cancel(tp
, XFS_TRANS_RELEASE_LOG_RES
| XFS_TRANS_ABORT
);
398 xfs_iunlock(ip
, XFS_IOLOCK_EXCL
| XFS_ILOCK_EXCL
);
405 xfs_inactive_symlink_local(
411 ASSERT(ip
->i_d
.di_size
<= XFS_IFORK_DSIZE(ip
));
413 * We're freeing a symlink which fit into
414 * the inode. Just free the memory used
415 * to hold the old symlink.
417 error
= xfs_trans_reserve(*tpp
, 0,
418 XFS_ITRUNCATE_LOG_RES(ip
->i_mount
),
419 0, XFS_TRANS_PERM_LOG_RES
,
420 XFS_ITRUNCATE_LOG_COUNT
);
423 xfs_trans_cancel(*tpp
, 0);
427 xfs_ilock(ip
, XFS_ILOCK_EXCL
| XFS_IOLOCK_EXCL
);
430 * Zero length symlinks _can_ exist.
432 if (ip
->i_df
.if_bytes
> 0) {
433 xfs_idata_realloc(ip
,
434 -(ip
->i_df
.if_bytes
),
436 ASSERT(ip
->i_df
.if_bytes
== 0);
450 ASSERT(xfs_isilocked(ip
, XFS_IOLOCK_EXCL
));
453 ASSERT(ip
->i_d
.di_forkoff
!= 0);
454 error
= xfs_trans_commit(tp
, XFS_TRANS_RELEASE_LOG_RES
);
455 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
459 error
= xfs_attr_inactive(ip
);
463 tp
= xfs_trans_alloc(mp
, XFS_TRANS_INACTIVE
);
464 error
= xfs_trans_reserve(tp
, 0,
465 XFS_IFREE_LOG_RES(mp
),
466 0, XFS_TRANS_PERM_LOG_RES
,
467 XFS_INACTIVE_LOG_COUNT
);
471 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
472 xfs_trans_ijoin(tp
, ip
, 0);
473 xfs_idestroy_fork(ip
, XFS_ATTR_FORK
);
475 ASSERT(ip
->i_d
.di_anextents
== 0);
481 ASSERT(XFS_FORCED_SHUTDOWN(mp
));
482 xfs_trans_cancel(tp
, 0);
485 xfs_iunlock(ip
, XFS_IOLOCK_EXCL
);
493 xfs_mount_t
*mp
= ip
->i_mount
;
496 if (!S_ISREG(ip
->i_d
.di_mode
) || (ip
->i_d
.di_mode
== 0))
499 /* If this is a read-only mount, don't do this (would generate I/O) */
500 if (mp
->m_flags
& XFS_MOUNT_RDONLY
)
503 if (!XFS_FORCED_SHUTDOWN(mp
)) {
507 * If we are using filestreams, and we have an unlinked
508 * file that we are processing the last close on, then nothing
509 * will be able to reopen and write to this file. Purge this
510 * inode from the filestreams cache so that it doesn't delay
511 * teardown of the inode.
513 if ((ip
->i_d
.di_nlink
== 0) && xfs_inode_is_filestream(ip
))
514 xfs_filestream_deassociate(ip
);
517 * If we previously truncated this file and removed old data
518 * in the process, we want to initiate "early" writeout on
519 * the last close. This is an attempt to combat the notorious
520 * NULL files problem which is particularly noticeable from a
521 * truncate down, buffered (re-)write (delalloc), followed by
522 * a crash. What we are effectively doing here is
523 * significantly reducing the time window where we'd otherwise
524 * be exposed to that problem.
526 truncated
= xfs_iflags_test_and_clear(ip
, XFS_ITRUNCATED
);
528 xfs_iflags_clear(ip
, XFS_IDIRTY_RELEASE
);
529 if (VN_DIRTY(VFS_I(ip
)) && ip
->i_delayed_blks
> 0)
530 xfs_flush_pages(ip
, 0, -1, XBF_ASYNC
, FI_NONE
);
534 if (ip
->i_d
.di_nlink
== 0)
537 if ((S_ISREG(ip
->i_d
.di_mode
) &&
538 ((ip
->i_size
> 0) || (VN_CACHED(VFS_I(ip
)) > 0 ||
539 ip
->i_delayed_blks
> 0)) &&
540 (ip
->i_df
.if_flags
& XFS_IFEXTENTS
)) &&
541 (!(ip
->i_d
.di_flags
& (XFS_DIFLAG_PREALLOC
| XFS_DIFLAG_APPEND
)))) {
544 * If we can't get the iolock just skip truncating the blocks
545 * past EOF because we could deadlock with the mmap_sem
546 * otherwise. We'll get another chance to drop them once the
547 * last reference to the inode is dropped, so we'll never leak
548 * blocks permanently.
550 * Further, check if the inode is being opened, written and
551 * closed frequently and we have delayed allocation blocks
552 * outstanding (e.g. streaming writes from the NFS server),
553 * truncating the blocks past EOF will cause fragmentation to
556 * In this case don't do the truncation, either, but we have to
557 * be careful how we detect this case. Blocks beyond EOF show
558 * up as i_delayed_blks even when the inode is clean, so we
559 * need to truncate them away first before checking for a dirty
560 * release. Hence on the first dirty close we will still remove
561 * the speculative allocation, but after that we will leave it
564 if (xfs_iflags_test(ip
, XFS_IDIRTY_RELEASE
))
567 error
= xfs_free_eofblocks(mp
, ip
,
568 XFS_FREE_EOF_TRYLOCK
);
572 /* delalloc blocks after truncation means it really is dirty */
573 if (ip
->i_delayed_blks
)
574 xfs_iflags_set(ip
, XFS_IDIRTY_RELEASE
);
582 * This is called when the vnode reference count for the vnode
583 * goes to zero. If the file has been unlinked, then it must
584 * now be truncated. Also, we clear all of the read-ahead state
585 * kept for the inode here since the file is now closed.
591 xfs_bmap_free_t free_list
;
592 xfs_fsblock_t first_block
;
600 * If the inode is already free, then there can be nothing
603 if (ip
->i_d
.di_mode
== 0 || is_bad_inode(VFS_I(ip
))) {
604 ASSERT(ip
->i_df
.if_real_bytes
== 0);
605 ASSERT(ip
->i_df
.if_broot_bytes
== 0);
606 return VN_INACTIVE_CACHE
;
610 * Only do a truncate if it's a regular file with
611 * some actual space in it. It's OK to look at the
612 * inode's fields without the lock because we're the
613 * only one with a reference to the inode.
615 truncate
= ((ip
->i_d
.di_nlink
== 0) &&
616 ((ip
->i_d
.di_size
!= 0) || (ip
->i_size
!= 0) ||
617 (ip
->i_d
.di_nextents
> 0) || (ip
->i_delayed_blks
> 0)) &&
618 S_ISREG(ip
->i_d
.di_mode
));
624 /* If this is a read-only mount, don't do this (would generate I/O) */
625 if (mp
->m_flags
& XFS_MOUNT_RDONLY
)
628 if (ip
->i_d
.di_nlink
!= 0) {
629 if ((S_ISREG(ip
->i_d
.di_mode
) &&
630 ((ip
->i_size
> 0) || (VN_CACHED(VFS_I(ip
)) > 0 ||
631 ip
->i_delayed_blks
> 0)) &&
632 (ip
->i_df
.if_flags
& XFS_IFEXTENTS
) &&
633 (!(ip
->i_d
.di_flags
&
634 (XFS_DIFLAG_PREALLOC
| XFS_DIFLAG_APPEND
)) ||
635 (ip
->i_delayed_blks
!= 0)))) {
636 error
= xfs_free_eofblocks(mp
, ip
, 0);
638 return VN_INACTIVE_CACHE
;
643 ASSERT(ip
->i_d
.di_nlink
== 0);
645 error
= xfs_qm_dqattach(ip
, 0);
647 return VN_INACTIVE_CACHE
;
649 tp
= xfs_trans_alloc(mp
, XFS_TRANS_INACTIVE
);
651 xfs_ilock(ip
, XFS_IOLOCK_EXCL
);
653 error
= xfs_trans_reserve(tp
, 0,
654 XFS_ITRUNCATE_LOG_RES(mp
),
655 0, XFS_TRANS_PERM_LOG_RES
,
656 XFS_ITRUNCATE_LOG_COUNT
);
658 /* Don't call itruncate_cleanup */
659 ASSERT(XFS_FORCED_SHUTDOWN(mp
));
660 xfs_trans_cancel(tp
, 0);
661 xfs_iunlock(ip
, XFS_IOLOCK_EXCL
);
662 return VN_INACTIVE_CACHE
;
665 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
666 xfs_trans_ijoin(tp
, ip
, 0);
668 error
= xfs_itruncate_data(&tp
, ip
, 0);
671 XFS_TRANS_RELEASE_LOG_RES
| XFS_TRANS_ABORT
);
672 xfs_iunlock(ip
, XFS_IOLOCK_EXCL
| XFS_ILOCK_EXCL
);
673 return VN_INACTIVE_CACHE
;
675 } else if (S_ISLNK(ip
->i_d
.di_mode
)) {
678 * If we get an error while cleaning up a
679 * symlink we bail out.
681 error
= (ip
->i_d
.di_size
> XFS_IFORK_DSIZE(ip
)) ?
682 xfs_inactive_symlink_rmt(ip
, &tp
) :
683 xfs_inactive_symlink_local(ip
, &tp
);
687 return VN_INACTIVE_CACHE
;
690 xfs_trans_ijoin(tp
, ip
, 0);
692 error
= xfs_trans_reserve(tp
, 0,
693 XFS_IFREE_LOG_RES(mp
),
694 0, XFS_TRANS_PERM_LOG_RES
,
695 XFS_INACTIVE_LOG_COUNT
);
697 ASSERT(XFS_FORCED_SHUTDOWN(mp
));
698 xfs_trans_cancel(tp
, 0);
699 return VN_INACTIVE_CACHE
;
702 xfs_ilock(ip
, XFS_ILOCK_EXCL
| XFS_IOLOCK_EXCL
);
703 xfs_trans_ijoin(tp
, ip
, 0);
707 * If there are attributes associated with the file
708 * then blow them away now. The code calls a routine
709 * that recursively deconstructs the attribute fork.
710 * We need to just commit the current transaction
711 * because we can't use it for xfs_attr_inactive().
713 if (ip
->i_d
.di_anextents
> 0) {
714 error
= xfs_inactive_attrs(ip
, &tp
);
716 * If we got an error, the transaction is already
717 * cancelled, and the inode is unlocked. Just get out.
720 return VN_INACTIVE_CACHE
;
721 } else if (ip
->i_afp
) {
722 xfs_idestroy_fork(ip
, XFS_ATTR_FORK
);
728 xfs_bmap_init(&free_list
, &first_block
);
729 error
= xfs_ifree(tp
, ip
, &free_list
);
732 * If we fail to free the inode, shut down. The cancel
733 * might do that, we need to make sure. Otherwise the
734 * inode might be lost for a long time or forever.
736 if (!XFS_FORCED_SHUTDOWN(mp
)) {
737 xfs_notice(mp
, "%s: xfs_ifree returned error %d",
739 xfs_force_shutdown(mp
, SHUTDOWN_META_IO_ERROR
);
741 xfs_trans_cancel(tp
, XFS_TRANS_RELEASE_LOG_RES
|XFS_TRANS_ABORT
);
744 * Credit the quota account(s). The inode is gone.
746 xfs_trans_mod_dquot_byino(tp
, ip
, XFS_TRANS_DQ_ICOUNT
, -1);
749 * Just ignore errors at this point. There is nothing we can
750 * do except to try to keep going. Make sure it's not a silent
753 error
= xfs_bmap_finish(&tp
, &free_list
, &committed
);
755 xfs_notice(mp
, "%s: xfs_bmap_finish returned error %d",
757 error
= xfs_trans_commit(tp
, XFS_TRANS_RELEASE_LOG_RES
);
759 xfs_notice(mp
, "%s: xfs_trans_commit returned error %d",
764 * Release the dquots held by inode, if any.
767 xfs_iunlock(ip
, XFS_IOLOCK_EXCL
| XFS_ILOCK_EXCL
);
770 return VN_INACTIVE_CACHE
;
774 * Lookups up an inode from "name". If ci_name is not NULL, then a CI match
775 * is allowed, otherwise it has to be an exact match. If a CI match is found,
776 * ci_name->name will point to a the actual name (caller must free) or
777 * will be set to NULL if an exact match is found.
782 struct xfs_name
*name
,
784 struct xfs_name
*ci_name
)
790 trace_xfs_lookup(dp
, name
);
792 if (XFS_FORCED_SHUTDOWN(dp
->i_mount
))
793 return XFS_ERROR(EIO
);
795 lock_mode
= xfs_ilock_map_shared(dp
);
796 error
= xfs_dir_lookup(NULL
, dp
, name
, &inum
, ci_name
);
797 xfs_iunlock_map_shared(dp
, lock_mode
);
802 error
= xfs_iget(dp
->i_mount
, NULL
, inum
, 0, 0, ipp
);
810 kmem_free(ci_name
->name
);
819 struct xfs_name
*name
,
824 int is_dir
= S_ISDIR(mode
);
825 struct xfs_mount
*mp
= dp
->i_mount
;
826 struct xfs_inode
*ip
= NULL
;
827 struct xfs_trans
*tp
= NULL
;
829 xfs_bmap_free_t free_list
;
830 xfs_fsblock_t first_block
;
831 boolean_t unlock_dp_on_error
= B_FALSE
;
835 struct xfs_dquot
*udqp
= NULL
;
836 struct xfs_dquot
*gdqp
= NULL
;
841 trace_xfs_create(dp
, name
);
843 if (XFS_FORCED_SHUTDOWN(mp
))
844 return XFS_ERROR(EIO
);
846 if (dp
->i_d
.di_flags
& XFS_DIFLAG_PROJINHERIT
)
847 prid
= xfs_get_projid(dp
);
849 prid
= XFS_PROJID_DEFAULT
;
852 * Make sure that we have allocated dquot(s) on disk.
854 error
= xfs_qm_vop_dqalloc(dp
, current_fsuid(), current_fsgid(), prid
,
855 XFS_QMOPT_QUOTALL
| XFS_QMOPT_INHERIT
, &udqp
, &gdqp
);
861 resblks
= XFS_MKDIR_SPACE_RES(mp
, name
->len
);
862 log_res
= XFS_MKDIR_LOG_RES(mp
);
863 log_count
= XFS_MKDIR_LOG_COUNT
;
864 tp
= xfs_trans_alloc(mp
, XFS_TRANS_MKDIR
);
866 resblks
= XFS_CREATE_SPACE_RES(mp
, name
->len
);
867 log_res
= XFS_CREATE_LOG_RES(mp
);
868 log_count
= XFS_CREATE_LOG_COUNT
;
869 tp
= xfs_trans_alloc(mp
, XFS_TRANS_CREATE
);
872 cancel_flags
= XFS_TRANS_RELEASE_LOG_RES
;
875 * Initially assume that the file does not exist and
876 * reserve the resources for that case. If that is not
877 * the case we'll drop the one we have and get a more
878 * appropriate transaction later.
880 error
= xfs_trans_reserve(tp
, resblks
, log_res
, 0,
881 XFS_TRANS_PERM_LOG_RES
, log_count
);
882 if (error
== ENOSPC
) {
883 /* flush outstanding delalloc blocks and retry */
884 xfs_flush_inodes(dp
);
885 error
= xfs_trans_reserve(tp
, resblks
, log_res
, 0,
886 XFS_TRANS_PERM_LOG_RES
, log_count
);
888 if (error
== ENOSPC
) {
889 /* No space at all so try a "no-allocation" reservation */
891 error
= xfs_trans_reserve(tp
, 0, log_res
, 0,
892 XFS_TRANS_PERM_LOG_RES
, log_count
);
896 goto out_trans_cancel
;
899 xfs_ilock(dp
, XFS_ILOCK_EXCL
| XFS_ILOCK_PARENT
);
900 unlock_dp_on_error
= B_TRUE
;
903 * Check for directory link count overflow.
905 if (is_dir
&& dp
->i_d
.di_nlink
>= XFS_MAXLINK
) {
906 error
= XFS_ERROR(EMLINK
);
907 goto out_trans_cancel
;
910 xfs_bmap_init(&free_list
, &first_block
);
913 * Reserve disk quota and the inode.
915 error
= xfs_trans_reserve_quota(tp
, mp
, udqp
, gdqp
, resblks
, 1, 0);
917 goto out_trans_cancel
;
919 error
= xfs_dir_canenter(tp
, dp
, name
, resblks
);
921 goto out_trans_cancel
;
924 * A newly created regular or special file just has one directory
925 * entry pointing to them, but a directory also the "." entry
926 * pointing to itself.
928 error
= xfs_dir_ialloc(&tp
, dp
, mode
, is_dir
? 2 : 1, rdev
,
929 prid
, resblks
> 0, &ip
, &committed
);
932 goto out_trans_cancel
;
933 goto out_trans_abort
;
937 * Now we join the directory inode to the transaction. We do not do it
938 * earlier because xfs_dir_ialloc might commit the previous transaction
939 * (and release all the locks). An error from here on will result in
940 * the transaction cancel unlocking dp so don't do it explicitly in the
943 xfs_trans_ijoin(tp
, dp
, XFS_ILOCK_EXCL
);
944 unlock_dp_on_error
= B_FALSE
;
946 error
= xfs_dir_createname(tp
, dp
, name
, ip
->i_ino
,
947 &first_block
, &free_list
, resblks
?
948 resblks
- XFS_IALLOC_SPACE_RES(mp
) : 0);
950 ASSERT(error
!= ENOSPC
);
951 goto out_trans_abort
;
953 xfs_trans_ichgtime(tp
, dp
, XFS_ICHGTIME_MOD
| XFS_ICHGTIME_CHG
);
954 xfs_trans_log_inode(tp
, dp
, XFS_ILOG_CORE
);
957 error
= xfs_dir_init(tp
, ip
, dp
);
959 goto out_bmap_cancel
;
961 error
= xfs_bumplink(tp
, dp
);
963 goto out_bmap_cancel
;
967 * If this is a synchronous mount, make sure that the
968 * create transaction goes to disk before returning to
971 if (mp
->m_flags
& (XFS_MOUNT_WSYNC
|XFS_MOUNT_DIRSYNC
))
972 xfs_trans_set_sync(tp
);
975 * Attach the dquot(s) to the inodes and modify them incore.
976 * These ids of the inode couldn't have changed since the new
977 * inode has been locked ever since it was created.
979 xfs_qm_vop_create_dqattach(tp
, ip
, udqp
, gdqp
);
981 error
= xfs_bmap_finish(&tp
, &free_list
, &committed
);
983 goto out_bmap_cancel
;
985 error
= xfs_trans_commit(tp
, XFS_TRANS_RELEASE_LOG_RES
);
987 goto out_release_inode
;
996 xfs_bmap_cancel(&free_list
);
998 cancel_flags
|= XFS_TRANS_ABORT
;
1000 xfs_trans_cancel(tp
, cancel_flags
);
1003 * Wait until after the current transaction is aborted to
1004 * release the inode. This prevents recursive transactions
1005 * and deadlocks from xfs_inactive.
1010 xfs_qm_dqrele(udqp
);
1011 xfs_qm_dqrele(gdqp
);
1013 if (unlock_dp_on_error
)
1014 xfs_iunlock(dp
, XFS_ILOCK_EXCL
);
1020 int xfs_small_retries
;
1021 int xfs_middle_retries
;
1022 int xfs_lots_retries
;
1023 int xfs_lock_delays
;
1027 * Bump the subclass so xfs_lock_inodes() acquires each lock with
1031 xfs_lock_inumorder(int lock_mode
, int subclass
)
1033 if (lock_mode
& (XFS_IOLOCK_SHARED
|XFS_IOLOCK_EXCL
))
1034 lock_mode
|= (subclass
+ XFS_LOCK_INUMORDER
) << XFS_IOLOCK_SHIFT
;
1035 if (lock_mode
& (XFS_ILOCK_SHARED
|XFS_ILOCK_EXCL
))
1036 lock_mode
|= (subclass
+ XFS_LOCK_INUMORDER
) << XFS_ILOCK_SHIFT
;
1042 * The following routine will lock n inodes in exclusive mode.
1043 * We assume the caller calls us with the inodes in i_ino order.
1045 * We need to detect deadlock where an inode that we lock
1046 * is in the AIL and we start waiting for another inode that is locked
1047 * by a thread in a long running transaction (such as truncate). This can
1048 * result in deadlock since the long running trans might need to wait
1049 * for the inode we just locked in order to push the tail and free space
1058 int attempts
= 0, i
, j
, try_lock
;
1061 ASSERT(ips
&& (inodes
>= 2)); /* we need at least two */
1067 for (; i
< inodes
; i
++) {
1070 if (i
&& (ips
[i
] == ips
[i
-1])) /* Already locked */
1074 * If try_lock is not set yet, make sure all locked inodes
1075 * are not in the AIL.
1076 * If any are, set try_lock to be used later.
1080 for (j
= (i
- 1); j
>= 0 && !try_lock
; j
--) {
1081 lp
= (xfs_log_item_t
*)ips
[j
]->i_itemp
;
1082 if (lp
&& (lp
->li_flags
& XFS_LI_IN_AIL
)) {
1089 * If any of the previous locks we have locked is in the AIL,
1090 * we must TRY to get the second and subsequent locks. If
1091 * we can't get any, we must release all we have
1096 /* try_lock must be 0 if i is 0. */
1098 * try_lock means we have an inode locked
1099 * that is in the AIL.
1102 if (!xfs_ilock_nowait(ips
[i
], xfs_lock_inumorder(lock_mode
, i
))) {
1106 * Unlock all previous guys and try again.
1107 * xfs_iunlock will try to push the tail
1108 * if the inode is in the AIL.
1111 for(j
= i
- 1; j
>= 0; j
--) {
1114 * Check to see if we've already
1115 * unlocked this one.
1116 * Not the first one going back,
1117 * and the inode ptr is the same.
1119 if ((j
!= (i
- 1)) && ips
[j
] ==
1123 xfs_iunlock(ips
[j
], lock_mode
);
1126 if ((attempts
% 5) == 0) {
1127 delay(1); /* Don't just spin the CPU */
1137 xfs_ilock(ips
[i
], xfs_lock_inumorder(lock_mode
, i
));
1143 if (attempts
< 5) xfs_small_retries
++;
1144 else if (attempts
< 100) xfs_middle_retries
++;
1145 else xfs_lots_retries
++;
1153 * xfs_lock_two_inodes() can only be used to lock one type of lock
1154 * at a time - the iolock or the ilock, but not both at once. If
1155 * we lock both at once, lockdep will report false positives saying
1156 * we have violated locking orders.
1159 xfs_lock_two_inodes(
1168 if (lock_mode
& (XFS_IOLOCK_SHARED
|XFS_IOLOCK_EXCL
))
1169 ASSERT((lock_mode
& (XFS_ILOCK_SHARED
|XFS_ILOCK_EXCL
)) == 0);
1170 ASSERT(ip0
->i_ino
!= ip1
->i_ino
);
1172 if (ip0
->i_ino
> ip1
->i_ino
) {
1179 xfs_ilock(ip0
, xfs_lock_inumorder(lock_mode
, 0));
1182 * If the first lock we have locked is in the AIL, we must TRY to get
1183 * the second lock. If we can't get it, we must release the first one
1186 lp
= (xfs_log_item_t
*)ip0
->i_itemp
;
1187 if (lp
&& (lp
->li_flags
& XFS_LI_IN_AIL
)) {
1188 if (!xfs_ilock_nowait(ip1
, xfs_lock_inumorder(lock_mode
, 1))) {
1189 xfs_iunlock(ip0
, lock_mode
);
1190 if ((++attempts
% 5) == 0)
1191 delay(1); /* Don't just spin the CPU */
1195 xfs_ilock(ip1
, xfs_lock_inumorder(lock_mode
, 1));
1202 struct xfs_name
*name
,
1205 xfs_mount_t
*mp
= dp
->i_mount
;
1206 xfs_trans_t
*tp
= NULL
;
1207 int is_dir
= S_ISDIR(ip
->i_d
.di_mode
);
1209 xfs_bmap_free_t free_list
;
1210 xfs_fsblock_t first_block
;
1217 trace_xfs_remove(dp
, name
);
1219 if (XFS_FORCED_SHUTDOWN(mp
))
1220 return XFS_ERROR(EIO
);
1222 error
= xfs_qm_dqattach(dp
, 0);
1226 error
= xfs_qm_dqattach(ip
, 0);
1231 tp
= xfs_trans_alloc(mp
, XFS_TRANS_RMDIR
);
1232 log_count
= XFS_DEFAULT_LOG_COUNT
;
1234 tp
= xfs_trans_alloc(mp
, XFS_TRANS_REMOVE
);
1235 log_count
= XFS_REMOVE_LOG_COUNT
;
1237 cancel_flags
= XFS_TRANS_RELEASE_LOG_RES
;
1240 * We try to get the real space reservation first,
1241 * allowing for directory btree deletion(s) implying
1242 * possible bmap insert(s). If we can't get the space
1243 * reservation then we use 0 instead, and avoid the bmap
1244 * btree insert(s) in the directory code by, if the bmap
1245 * insert tries to happen, instead trimming the LAST
1246 * block from the directory.
1248 resblks
= XFS_REMOVE_SPACE_RES(mp
);
1249 error
= xfs_trans_reserve(tp
, resblks
, XFS_REMOVE_LOG_RES(mp
), 0,
1250 XFS_TRANS_PERM_LOG_RES
, log_count
);
1251 if (error
== ENOSPC
) {
1253 error
= xfs_trans_reserve(tp
, 0, XFS_REMOVE_LOG_RES(mp
), 0,
1254 XFS_TRANS_PERM_LOG_RES
, log_count
);
1257 ASSERT(error
!= ENOSPC
);
1259 goto out_trans_cancel
;
1262 xfs_lock_two_inodes(dp
, ip
, XFS_ILOCK_EXCL
);
1264 xfs_trans_ijoin(tp
, dp
, XFS_ILOCK_EXCL
);
1265 xfs_trans_ijoin(tp
, ip
, XFS_ILOCK_EXCL
);
1268 * If we're removing a directory perform some additional validation.
1271 ASSERT(ip
->i_d
.di_nlink
>= 2);
1272 if (ip
->i_d
.di_nlink
!= 2) {
1273 error
= XFS_ERROR(ENOTEMPTY
);
1274 goto out_trans_cancel
;
1276 if (!xfs_dir_isempty(ip
)) {
1277 error
= XFS_ERROR(ENOTEMPTY
);
1278 goto out_trans_cancel
;
1282 xfs_bmap_init(&free_list
, &first_block
);
1283 error
= xfs_dir_removename(tp
, dp
, name
, ip
->i_ino
,
1284 &first_block
, &free_list
, resblks
);
1286 ASSERT(error
!= ENOENT
);
1287 goto out_bmap_cancel
;
1289 xfs_trans_ichgtime(tp
, dp
, XFS_ICHGTIME_MOD
| XFS_ICHGTIME_CHG
);
1293 * Drop the link from ip's "..".
1295 error
= xfs_droplink(tp
, dp
);
1297 goto out_bmap_cancel
;
1300 * Drop the "." link from ip to self.
1302 error
= xfs_droplink(tp
, ip
);
1304 goto out_bmap_cancel
;
1307 * When removing a non-directory we need to log the parent
1308 * inode here. For a directory this is done implicitly
1309 * by the xfs_droplink call for the ".." entry.
1311 xfs_trans_log_inode(tp
, dp
, XFS_ILOG_CORE
);
1315 * Drop the link from dp to ip.
1317 error
= xfs_droplink(tp
, ip
);
1319 goto out_bmap_cancel
;
1322 * Determine if this is the last link while
1323 * we are in the transaction.
1325 link_zero
= (ip
->i_d
.di_nlink
== 0);
1328 * If this is a synchronous mount, make sure that the
1329 * remove transaction goes to disk before returning to
1332 if (mp
->m_flags
& (XFS_MOUNT_WSYNC
|XFS_MOUNT_DIRSYNC
))
1333 xfs_trans_set_sync(tp
);
1335 error
= xfs_bmap_finish(&tp
, &free_list
, &committed
);
1337 goto out_bmap_cancel
;
1339 error
= xfs_trans_commit(tp
, XFS_TRANS_RELEASE_LOG_RES
);
1344 * If we are using filestreams, kill the stream association.
1345 * If the file is still open it may get a new one but that
1346 * will get killed on last close in xfs_close() so we don't
1347 * have to worry about that.
1349 if (!is_dir
&& link_zero
&& xfs_inode_is_filestream(ip
))
1350 xfs_filestream_deassociate(ip
);
1355 xfs_bmap_cancel(&free_list
);
1356 cancel_flags
|= XFS_TRANS_ABORT
;
1358 xfs_trans_cancel(tp
, cancel_flags
);
1367 struct xfs_name
*target_name
)
1369 xfs_mount_t
*mp
= tdp
->i_mount
;
1372 xfs_bmap_free_t free_list
;
1373 xfs_fsblock_t first_block
;
1378 trace_xfs_link(tdp
, target_name
);
1380 ASSERT(!S_ISDIR(sip
->i_d
.di_mode
));
1382 if (XFS_FORCED_SHUTDOWN(mp
))
1383 return XFS_ERROR(EIO
);
1385 error
= xfs_qm_dqattach(sip
, 0);
1389 error
= xfs_qm_dqattach(tdp
, 0);
1393 tp
= xfs_trans_alloc(mp
, XFS_TRANS_LINK
);
1394 cancel_flags
= XFS_TRANS_RELEASE_LOG_RES
;
1395 resblks
= XFS_LINK_SPACE_RES(mp
, target_name
->len
);
1396 error
= xfs_trans_reserve(tp
, resblks
, XFS_LINK_LOG_RES(mp
), 0,
1397 XFS_TRANS_PERM_LOG_RES
, XFS_LINK_LOG_COUNT
);
1398 if (error
== ENOSPC
) {
1400 error
= xfs_trans_reserve(tp
, 0, XFS_LINK_LOG_RES(mp
), 0,
1401 XFS_TRANS_PERM_LOG_RES
, XFS_LINK_LOG_COUNT
);
1408 xfs_lock_two_inodes(sip
, tdp
, XFS_ILOCK_EXCL
);
1410 xfs_trans_ijoin(tp
, sip
, XFS_ILOCK_EXCL
);
1411 xfs_trans_ijoin(tp
, tdp
, XFS_ILOCK_EXCL
);
1414 * If the source has too many links, we can't make any more to it.
1416 if (sip
->i_d
.di_nlink
>= XFS_MAXLINK
) {
1417 error
= XFS_ERROR(EMLINK
);
1422 * If we are using project inheritance, we only allow hard link
1423 * creation in our tree when the project IDs are the same; else
1424 * the tree quota mechanism could be circumvented.
1426 if (unlikely((tdp
->i_d
.di_flags
& XFS_DIFLAG_PROJINHERIT
) &&
1427 (xfs_get_projid(tdp
) != xfs_get_projid(sip
)))) {
1428 error
= XFS_ERROR(EXDEV
);
1432 error
= xfs_dir_canenter(tp
, tdp
, target_name
, resblks
);
1436 xfs_bmap_init(&free_list
, &first_block
);
1438 error
= xfs_dir_createname(tp
, tdp
, target_name
, sip
->i_ino
,
1439 &first_block
, &free_list
, resblks
);
1442 xfs_trans_ichgtime(tp
, tdp
, XFS_ICHGTIME_MOD
| XFS_ICHGTIME_CHG
);
1443 xfs_trans_log_inode(tp
, tdp
, XFS_ILOG_CORE
);
1445 error
= xfs_bumplink(tp
, sip
);
1450 * If this is a synchronous mount, make sure that the
1451 * link transaction goes to disk before returning to
1454 if (mp
->m_flags
& (XFS_MOUNT_WSYNC
|XFS_MOUNT_DIRSYNC
)) {
1455 xfs_trans_set_sync(tp
);
1458 error
= xfs_bmap_finish (&tp
, &free_list
, &committed
);
1460 xfs_bmap_cancel(&free_list
);
1464 return xfs_trans_commit(tp
, XFS_TRANS_RELEASE_LOG_RES
);
1467 cancel_flags
|= XFS_TRANS_ABORT
;
1469 xfs_trans_cancel(tp
, cancel_flags
);
1477 struct xfs_name
*link_name
,
1478 const char *target_path
,
1482 xfs_mount_t
*mp
= dp
->i_mount
;
1487 xfs_bmap_free_t free_list
;
1488 xfs_fsblock_t first_block
;
1489 boolean_t unlock_dp_on_error
= B_FALSE
;
1492 xfs_fileoff_t first_fsb
;
1493 xfs_filblks_t fs_blocks
;
1495 xfs_bmbt_irec_t mval
[SYMLINK_MAPS
];
1497 const char *cur_chunk
;
1502 struct xfs_dquot
*udqp
, *gdqp
;
1510 trace_xfs_symlink(dp
, link_name
);
1512 if (XFS_FORCED_SHUTDOWN(mp
))
1513 return XFS_ERROR(EIO
);
1516 * Check component lengths of the target path name.
1518 pathlen
= strlen(target_path
);
1519 if (pathlen
>= MAXPATHLEN
) /* total string too long */
1520 return XFS_ERROR(ENAMETOOLONG
);
1523 if (dp
->i_d
.di_flags
& XFS_DIFLAG_PROJINHERIT
)
1524 prid
= xfs_get_projid(dp
);
1526 prid
= XFS_PROJID_DEFAULT
;
1529 * Make sure that we have allocated dquot(s) on disk.
1531 error
= xfs_qm_vop_dqalloc(dp
, current_fsuid(), current_fsgid(), prid
,
1532 XFS_QMOPT_QUOTALL
| XFS_QMOPT_INHERIT
, &udqp
, &gdqp
);
1536 tp
= xfs_trans_alloc(mp
, XFS_TRANS_SYMLINK
);
1537 cancel_flags
= XFS_TRANS_RELEASE_LOG_RES
;
1539 * The symlink will fit into the inode data fork?
1540 * There can't be any attributes so we get the whole variable part.
1542 if (pathlen
<= XFS_LITINO(mp
))
1545 fs_blocks
= XFS_B_TO_FSB(mp
, pathlen
);
1546 resblks
= XFS_SYMLINK_SPACE_RES(mp
, link_name
->len
, fs_blocks
);
1547 error
= xfs_trans_reserve(tp
, resblks
, XFS_SYMLINK_LOG_RES(mp
), 0,
1548 XFS_TRANS_PERM_LOG_RES
, XFS_SYMLINK_LOG_COUNT
);
1549 if (error
== ENOSPC
&& fs_blocks
== 0) {
1551 error
= xfs_trans_reserve(tp
, 0, XFS_SYMLINK_LOG_RES(mp
), 0,
1552 XFS_TRANS_PERM_LOG_RES
, XFS_SYMLINK_LOG_COUNT
);
1559 xfs_ilock(dp
, XFS_ILOCK_EXCL
| XFS_ILOCK_PARENT
);
1560 unlock_dp_on_error
= B_TRUE
;
1563 * Check whether the directory allows new symlinks or not.
1565 if (dp
->i_d
.di_flags
& XFS_DIFLAG_NOSYMLINKS
) {
1566 error
= XFS_ERROR(EPERM
);
1571 * Reserve disk quota : blocks and inode.
1573 error
= xfs_trans_reserve_quota(tp
, mp
, udqp
, gdqp
, resblks
, 1, 0);
1578 * Check for ability to enter directory entry, if no space reserved.
1580 error
= xfs_dir_canenter(tp
, dp
, link_name
, resblks
);
1584 * Initialize the bmap freelist prior to calling either
1585 * bmapi or the directory create code.
1587 xfs_bmap_init(&free_list
, &first_block
);
1590 * Allocate an inode for the symlink.
1592 error
= xfs_dir_ialloc(&tp
, dp
, S_IFLNK
| (mode
& ~S_IFMT
), 1, 0,
1593 prid
, resblks
> 0, &ip
, NULL
);
1595 if (error
== ENOSPC
)
1601 * An error after we've joined dp to the transaction will result in the
1602 * transaction cancel unlocking dp so don't do it explicitly in the
1605 xfs_trans_ijoin(tp
, dp
, XFS_ILOCK_EXCL
);
1606 unlock_dp_on_error
= B_FALSE
;
1609 * Also attach the dquot(s) to it, if applicable.
1611 xfs_qm_vop_create_dqattach(tp
, ip
, udqp
, gdqp
);
1614 resblks
-= XFS_IALLOC_SPACE_RES(mp
);
1616 * If the symlink will fit into the inode, write it inline.
1618 if (pathlen
<= XFS_IFORK_DSIZE(ip
)) {
1619 xfs_idata_realloc(ip
, pathlen
, XFS_DATA_FORK
);
1620 memcpy(ip
->i_df
.if_u1
.if_data
, target_path
, pathlen
);
1621 ip
->i_d
.di_size
= pathlen
;
1624 * The inode was initially created in extent format.
1626 ip
->i_df
.if_flags
&= ~(XFS_IFEXTENTS
| XFS_IFBROOT
);
1627 ip
->i_df
.if_flags
|= XFS_IFINLINE
;
1629 ip
->i_d
.di_format
= XFS_DINODE_FMT_LOCAL
;
1630 xfs_trans_log_inode(tp
, ip
, XFS_ILOG_DDATA
| XFS_ILOG_CORE
);
1634 nmaps
= SYMLINK_MAPS
;
1636 error
= xfs_bmapi_write(tp
, ip
, first_fsb
, fs_blocks
,
1637 XFS_BMAPI_METADATA
, &first_block
, resblks
,
1638 mval
, &nmaps
, &free_list
);
1643 resblks
-= fs_blocks
;
1644 ip
->i_d
.di_size
= pathlen
;
1645 xfs_trans_log_inode(tp
, ip
, XFS_ILOG_CORE
);
1647 cur_chunk
= target_path
;
1648 for (n
= 0; n
< nmaps
; n
++) {
1649 d
= XFS_FSB_TO_DADDR(mp
, mval
[n
].br_startblock
);
1650 byte_cnt
= XFS_FSB_TO_B(mp
, mval
[n
].br_blockcount
);
1651 bp
= xfs_trans_get_buf(tp
, mp
->m_ddev_targp
, d
,
1652 BTOBB(byte_cnt
), 0);
1657 if (pathlen
< byte_cnt
) {
1660 pathlen
-= byte_cnt
;
1662 memcpy(bp
->b_addr
, cur_chunk
, byte_cnt
);
1663 cur_chunk
+= byte_cnt
;
1665 xfs_trans_log_buf(tp
, bp
, 0, byte_cnt
- 1);
1670 * Create the directory entry for the symlink.
1672 error
= xfs_dir_createname(tp
, dp
, link_name
, ip
->i_ino
,
1673 &first_block
, &free_list
, resblks
);
1676 xfs_trans_ichgtime(tp
, dp
, XFS_ICHGTIME_MOD
| XFS_ICHGTIME_CHG
);
1677 xfs_trans_log_inode(tp
, dp
, XFS_ILOG_CORE
);
1680 * If this is a synchronous mount, make sure that the
1681 * symlink transaction goes to disk before returning to
1684 if (mp
->m_flags
& (XFS_MOUNT_WSYNC
|XFS_MOUNT_DIRSYNC
)) {
1685 xfs_trans_set_sync(tp
);
1688 error
= xfs_bmap_finish(&tp
, &free_list
, &committed
);
1692 error
= xfs_trans_commit(tp
, XFS_TRANS_RELEASE_LOG_RES
);
1693 xfs_qm_dqrele(udqp
);
1694 xfs_qm_dqrele(gdqp
);
1702 xfs_bmap_cancel(&free_list
);
1703 cancel_flags
|= XFS_TRANS_ABORT
;
1705 xfs_trans_cancel(tp
, cancel_flags
);
1706 xfs_qm_dqrele(udqp
);
1707 xfs_qm_dqrele(gdqp
);
1709 if (unlock_dp_on_error
)
1710 xfs_iunlock(dp
, XFS_ILOCK_EXCL
);
1721 xfs_mount_t
*mp
= ip
->i_mount
;
1725 if (!capable(CAP_SYS_ADMIN
))
1726 return XFS_ERROR(EPERM
);
1728 if (XFS_FORCED_SHUTDOWN(mp
))
1729 return XFS_ERROR(EIO
);
1731 tp
= xfs_trans_alloc(mp
, XFS_TRANS_SET_DMATTRS
);
1732 error
= xfs_trans_reserve(tp
, 0, XFS_ICHANGE_LOG_RES (mp
), 0, 0, 0);
1734 xfs_trans_cancel(tp
, 0);
1737 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
1738 xfs_trans_ijoin(tp
, ip
, XFS_ILOCK_EXCL
);
1740 ip
->i_d
.di_dmevmask
= evmask
;
1741 ip
->i_d
.di_dmstate
= state
;
1743 xfs_trans_log_inode(tp
, ip
, XFS_ILOG_CORE
);
1744 error
= xfs_trans_commit(tp
, 0);
1750 * xfs_alloc_file_space()
1751 * This routine allocates disk space for the given file.
1753 * If alloc_type == 0, this request is for an ALLOCSP type
1754 * request which will change the file size. In this case, no
1755 * DMAPI event will be generated by the call. A TRUNCATE event
1756 * will be generated later by xfs_setattr.
1758 * If alloc_type != 0, this request is for a RESVSP type
1759 * request, and a DMAPI DM_EVENT_WRITE will be generated if the
1760 * lower block boundary byte address is less than the file's
1769 xfs_alloc_file_space(
1776 xfs_mount_t
*mp
= ip
->i_mount
;
1778 xfs_filblks_t allocated_fsb
;
1779 xfs_filblks_t allocatesize_fsb
;
1780 xfs_extlen_t extsz
, temp
;
1781 xfs_fileoff_t startoffset_fsb
;
1782 xfs_fsblock_t firstfsb
;
1787 xfs_bmbt_irec_t imaps
[1], *imapp
;
1788 xfs_bmap_free_t free_list
;
1789 uint qblocks
, resblks
, resrtextents
;
1793 trace_xfs_alloc_file_space(ip
);
1795 if (XFS_FORCED_SHUTDOWN(mp
))
1796 return XFS_ERROR(EIO
);
1798 error
= xfs_qm_dqattach(ip
, 0);
1803 return XFS_ERROR(EINVAL
);
1805 rt
= XFS_IS_REALTIME_INODE(ip
);
1806 extsz
= xfs_get_extsz_hint(ip
);
1811 startoffset_fsb
= XFS_B_TO_FSBT(mp
, offset
);
1812 allocatesize_fsb
= XFS_B_TO_FSB(mp
, count
);
1815 * Allocate file space until done or until there is an error
1817 while (allocatesize_fsb
&& !error
) {
1821 * Determine space reservations for data/realtime.
1823 if (unlikely(extsz
)) {
1824 s
= startoffset_fsb
;
1827 e
= startoffset_fsb
+ allocatesize_fsb
;
1828 if ((temp
= do_mod(startoffset_fsb
, extsz
)))
1830 if ((temp
= do_mod(e
, extsz
)))
1834 e
= allocatesize_fsb
;
1838 * The transaction reservation is limited to a 32-bit block
1839 * count, hence we need to limit the number of blocks we are
1840 * trying to reserve to avoid an overflow. We can't allocate
1841 * more than @nimaps extents, and an extent is limited on disk
1842 * to MAXEXTLEN (21 bits), so use that to enforce the limit.
1844 resblks
= min_t(xfs_fileoff_t
, (e
- s
), (MAXEXTLEN
* nimaps
));
1846 resrtextents
= qblocks
= resblks
;
1847 resrtextents
/= mp
->m_sb
.sb_rextsize
;
1848 resblks
= XFS_DIOSTRAT_SPACE_RES(mp
, 0);
1849 quota_flag
= XFS_QMOPT_RES_RTBLKS
;
1852 resblks
= qblocks
= XFS_DIOSTRAT_SPACE_RES(mp
, resblks
);
1853 quota_flag
= XFS_QMOPT_RES_REGBLKS
;
1857 * Allocate and setup the transaction.
1859 tp
= xfs_trans_alloc(mp
, XFS_TRANS_DIOSTRAT
);
1860 error
= xfs_trans_reserve(tp
, resblks
,
1861 XFS_WRITE_LOG_RES(mp
), resrtextents
,
1862 XFS_TRANS_PERM_LOG_RES
,
1863 XFS_WRITE_LOG_COUNT
);
1865 * Check for running out of space
1869 * Free the transaction structure.
1871 ASSERT(error
== ENOSPC
|| XFS_FORCED_SHUTDOWN(mp
));
1872 xfs_trans_cancel(tp
, 0);
1875 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
1876 error
= xfs_trans_reserve_quota_nblks(tp
, ip
, qblocks
,
1881 xfs_trans_ijoin(tp
, ip
, 0);
1883 xfs_bmap_init(&free_list
, &firstfsb
);
1884 error
= xfs_bmapi_write(tp
, ip
, startoffset_fsb
,
1885 allocatesize_fsb
, alloc_type
, &firstfsb
,
1886 0, imapp
, &nimaps
, &free_list
);
1892 * Complete the transaction
1894 error
= xfs_bmap_finish(&tp
, &free_list
, &committed
);
1899 error
= xfs_trans_commit(tp
, XFS_TRANS_RELEASE_LOG_RES
);
1900 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
1905 allocated_fsb
= imapp
->br_blockcount
;
1908 error
= XFS_ERROR(ENOSPC
);
1912 startoffset_fsb
+= allocated_fsb
;
1913 allocatesize_fsb
-= allocated_fsb
;
1918 error0
: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */
1919 xfs_bmap_cancel(&free_list
);
1920 xfs_trans_unreserve_quota_nblks(tp
, ip
, qblocks
, 0, quota_flag
);
1922 error1
: /* Just cancel transaction */
1923 xfs_trans_cancel(tp
, XFS_TRANS_RELEASE_LOG_RES
| XFS_TRANS_ABORT
);
1924 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
1929 * Zero file bytes between startoff and endoff inclusive.
1930 * The iolock is held exclusive and no blocks are buffered.
1932 * This function is used by xfs_free_file_space() to zero
1933 * partial blocks when the range to free is not block aligned.
1934 * When unreserving space with boundaries that are not block
1935 * aligned we round up the start and round down the end
1936 * boundaries and then use this function to zero the parts of
1937 * the blocks that got dropped during the rounding.
1940 xfs_zero_remaining_bytes(
1945 xfs_bmbt_irec_t imap
;
1946 xfs_fileoff_t offset_fsb
;
1947 xfs_off_t lastoffset
;
1950 xfs_mount_t
*mp
= ip
->i_mount
;
1955 * Avoid doing I/O beyond eof - it's not necessary
1956 * since nothing can read beyond eof. The space will
1957 * be zeroed when the file is extended anyway.
1959 if (startoff
>= ip
->i_size
)
1962 if (endoff
> ip
->i_size
)
1963 endoff
= ip
->i_size
;
1965 bp
= xfs_buf_get_uncached(XFS_IS_REALTIME_INODE(ip
) ?
1966 mp
->m_rtdev_targp
: mp
->m_ddev_targp
,
1967 mp
->m_sb
.sb_blocksize
, XBF_DONT_BLOCK
);
1969 return XFS_ERROR(ENOMEM
);
1973 for (offset
= startoff
; offset
<= endoff
; offset
= lastoffset
+ 1) {
1974 offset_fsb
= XFS_B_TO_FSBT(mp
, offset
);
1976 error
= xfs_bmapi_read(ip
, offset_fsb
, 1, &imap
, &nimap
, 0);
1977 if (error
|| nimap
< 1)
1979 ASSERT(imap
.br_blockcount
>= 1);
1980 ASSERT(imap
.br_startoff
== offset_fsb
);
1981 lastoffset
= XFS_FSB_TO_B(mp
, imap
.br_startoff
+ 1) - 1;
1982 if (lastoffset
> endoff
)
1983 lastoffset
= endoff
;
1984 if (imap
.br_startblock
== HOLESTARTBLOCK
)
1986 ASSERT(imap
.br_startblock
!= DELAYSTARTBLOCK
);
1987 if (imap
.br_state
== XFS_EXT_UNWRITTEN
)
1990 XFS_BUF_UNWRITE(bp
);
1992 XFS_BUF_SET_ADDR(bp
, xfs_fsb_to_db(ip
, imap
.br_startblock
));
1994 error
= xfs_buf_iowait(bp
);
1996 xfs_ioerror_alert("xfs_zero_remaining_bytes(read)",
1997 mp
, bp
, XFS_BUF_ADDR(bp
));
2001 (offset
- XFS_FSB_TO_B(mp
, imap
.br_startoff
)),
2002 0, lastoffset
- offset
+ 1);
2007 error
= xfs_buf_iowait(bp
);
2009 xfs_ioerror_alert("xfs_zero_remaining_bytes(write)",
2010 mp
, bp
, XFS_BUF_ADDR(bp
));
2019 * xfs_free_file_space()
2020 * This routine frees disk space for the given file.
2022 * This routine is only called by xfs_change_file_space
2023 * for an UNRESVSP type call.
2031 xfs_free_file_space(
2039 xfs_fileoff_t endoffset_fsb
;
2041 xfs_fsblock_t firstfsb
;
2042 xfs_bmap_free_t free_list
;
2043 xfs_bmbt_irec_t imap
;
2051 xfs_fileoff_t startoffset_fsb
;
2053 int need_iolock
= 1;
2057 trace_xfs_free_file_space(ip
);
2059 error
= xfs_qm_dqattach(ip
, 0);
2064 if (len
<= 0) /* if nothing being freed */
2066 rt
= XFS_IS_REALTIME_INODE(ip
);
2067 startoffset_fsb
= XFS_B_TO_FSB(mp
, offset
);
2068 endoffset_fsb
= XFS_B_TO_FSBT(mp
, offset
+ len
);
2070 if (attr_flags
& XFS_ATTR_NOLOCK
)
2073 xfs_ilock(ip
, XFS_IOLOCK_EXCL
);
2074 /* wait for the completion of any pending DIOs */
2075 inode_dio_wait(VFS_I(ip
));
2078 rounding
= max_t(uint
, 1 << mp
->m_sb
.sb_blocklog
, PAGE_CACHE_SIZE
);
2079 ioffset
= offset
& ~(rounding
- 1);
2081 if (VN_CACHED(VFS_I(ip
)) != 0) {
2082 error
= xfs_flushinval_pages(ip
, ioffset
, -1, FI_REMAPF_LOCKED
);
2084 goto out_unlock_iolock
;
2088 * Need to zero the stuff we're not freeing, on disk.
2089 * If it's a realtime file & can't use unwritten extents then we
2090 * actually need to zero the extent edges. Otherwise xfs_bunmapi
2091 * will take care of it for us.
2093 if (rt
&& !xfs_sb_version_hasextflgbit(&mp
->m_sb
)) {
2095 error
= xfs_bmapi_read(ip
, startoffset_fsb
, 1,
2098 goto out_unlock_iolock
;
2099 ASSERT(nimap
== 0 || nimap
== 1);
2100 if (nimap
&& imap
.br_startblock
!= HOLESTARTBLOCK
) {
2103 ASSERT(imap
.br_startblock
!= DELAYSTARTBLOCK
);
2104 block
= imap
.br_startblock
;
2105 mod
= do_div(block
, mp
->m_sb
.sb_rextsize
);
2107 startoffset_fsb
+= mp
->m_sb
.sb_rextsize
- mod
;
2110 error
= xfs_bmapi_read(ip
, endoffset_fsb
- 1, 1,
2113 goto out_unlock_iolock
;
2114 ASSERT(nimap
== 0 || nimap
== 1);
2115 if (nimap
&& imap
.br_startblock
!= HOLESTARTBLOCK
) {
2116 ASSERT(imap
.br_startblock
!= DELAYSTARTBLOCK
);
2118 if (mod
&& (mod
!= mp
->m_sb
.sb_rextsize
))
2119 endoffset_fsb
-= mod
;
2122 if ((done
= (endoffset_fsb
<= startoffset_fsb
)))
2124 * One contiguous piece to clear
2126 error
= xfs_zero_remaining_bytes(ip
, offset
, offset
+ len
- 1);
2129 * Some full blocks, possibly two pieces to clear
2131 if (offset
< XFS_FSB_TO_B(mp
, startoffset_fsb
))
2132 error
= xfs_zero_remaining_bytes(ip
, offset
,
2133 XFS_FSB_TO_B(mp
, startoffset_fsb
) - 1);
2135 XFS_FSB_TO_B(mp
, endoffset_fsb
) < offset
+ len
)
2136 error
= xfs_zero_remaining_bytes(ip
,
2137 XFS_FSB_TO_B(mp
, endoffset_fsb
),
2142 * free file space until done or until there is an error
2144 resblks
= XFS_DIOSTRAT_SPACE_RES(mp
, 0);
2145 while (!error
&& !done
) {
2148 * allocate and setup the transaction. Allow this
2149 * transaction to dip into the reserve blocks to ensure
2150 * the freeing of the space succeeds at ENOSPC.
2152 tp
= xfs_trans_alloc(mp
, XFS_TRANS_DIOSTRAT
);
2153 tp
->t_flags
|= XFS_TRANS_RESERVE
;
2154 error
= xfs_trans_reserve(tp
,
2156 XFS_WRITE_LOG_RES(mp
),
2158 XFS_TRANS_PERM_LOG_RES
,
2159 XFS_WRITE_LOG_COUNT
);
2162 * check for running out of space
2166 * Free the transaction structure.
2168 ASSERT(error
== ENOSPC
|| XFS_FORCED_SHUTDOWN(mp
));
2169 xfs_trans_cancel(tp
, 0);
2172 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
2173 error
= xfs_trans_reserve_quota(tp
, mp
,
2174 ip
->i_udquot
, ip
->i_gdquot
,
2175 resblks
, 0, XFS_QMOPT_RES_REGBLKS
);
2179 xfs_trans_ijoin(tp
, ip
, 0);
2182 * issue the bunmapi() call to free the blocks
2184 xfs_bmap_init(&free_list
, &firstfsb
);
2185 error
= xfs_bunmapi(tp
, ip
, startoffset_fsb
,
2186 endoffset_fsb
- startoffset_fsb
,
2187 0, 2, &firstfsb
, &free_list
, &done
);
2193 * complete the transaction
2195 error
= xfs_bmap_finish(&tp
, &free_list
, &committed
);
2200 error
= xfs_trans_commit(tp
, XFS_TRANS_RELEASE_LOG_RES
);
2201 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
2206 xfs_iunlock(ip
, XFS_IOLOCK_EXCL
);
2210 xfs_bmap_cancel(&free_list
);
2212 xfs_trans_cancel(tp
, XFS_TRANS_RELEASE_LOG_RES
| XFS_TRANS_ABORT
);
2213 xfs_iunlock(ip
, need_iolock
? (XFS_ILOCK_EXCL
| XFS_IOLOCK_EXCL
) :
2219 * xfs_change_file_space()
2220 * This routine allocates or frees disk space for the given file.
2221 * The user specified parameters are checked for alignment and size
2230 xfs_change_file_space(
2237 xfs_mount_t
*mp
= ip
->i_mount
;
2242 xfs_off_t startoffset
;
2248 if (!S_ISREG(ip
->i_d
.di_mode
))
2249 return XFS_ERROR(EINVAL
);
2251 switch (bf
->l_whence
) {
2252 case 0: /*SEEK_SET*/
2254 case 1: /*SEEK_CUR*/
2255 bf
->l_start
+= offset
;
2257 case 2: /*SEEK_END*/
2258 bf
->l_start
+= ip
->i_size
;
2261 return XFS_ERROR(EINVAL
);
2264 llen
= bf
->l_len
> 0 ? bf
->l_len
- 1 : bf
->l_len
;
2266 if ( (bf
->l_start
< 0)
2267 || (bf
->l_start
> XFS_MAXIOFFSET(mp
))
2268 || (bf
->l_start
+ llen
< 0)
2269 || (bf
->l_start
+ llen
> XFS_MAXIOFFSET(mp
)))
2270 return XFS_ERROR(EINVAL
);
2274 startoffset
= bf
->l_start
;
2278 * XFS_IOC_RESVSP and XFS_IOC_UNRESVSP will reserve or unreserve
2280 * These calls do NOT zero the data space allocated to the file,
2281 * nor do they change the file size.
2283 * XFS_IOC_ALLOCSP and XFS_IOC_FREESP will allocate and free file
2285 * These calls cause the new file data to be zeroed and the file
2286 * size to be changed.
2288 setprealloc
= clrprealloc
= 0;
2289 prealloc_type
= XFS_BMAPI_PREALLOC
;
2292 case XFS_IOC_ZERO_RANGE
:
2293 prealloc_type
|= XFS_BMAPI_CONVERT
;
2294 xfs_tosspages(ip
, startoffset
, startoffset
+ bf
->l_len
, 0);
2296 case XFS_IOC_RESVSP
:
2297 case XFS_IOC_RESVSP64
:
2298 error
= xfs_alloc_file_space(ip
, startoffset
, bf
->l_len
,
2299 prealloc_type
, attr_flags
);
2305 case XFS_IOC_UNRESVSP
:
2306 case XFS_IOC_UNRESVSP64
:
2307 if ((error
= xfs_free_file_space(ip
, startoffset
, bf
->l_len
,
2312 case XFS_IOC_ALLOCSP
:
2313 case XFS_IOC_ALLOCSP64
:
2314 case XFS_IOC_FREESP
:
2315 case XFS_IOC_FREESP64
:
2316 if (startoffset
> fsize
) {
2317 error
= xfs_alloc_file_space(ip
, fsize
,
2318 startoffset
- fsize
, 0, attr_flags
);
2323 iattr
.ia_valid
= ATTR_SIZE
;
2324 iattr
.ia_size
= startoffset
;
2326 error
= xfs_setattr_size(ip
, &iattr
, attr_flags
);
2336 return XFS_ERROR(EINVAL
);
2340 * update the inode timestamp, mode, and prealloc flag bits
2342 tp
= xfs_trans_alloc(mp
, XFS_TRANS_WRITEID
);
2344 if ((error
= xfs_trans_reserve(tp
, 0, XFS_WRITEID_LOG_RES(mp
),
2347 xfs_trans_cancel(tp
, 0);
2351 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
2352 xfs_trans_ijoin(tp
, ip
, XFS_ILOCK_EXCL
);
2354 if ((attr_flags
& XFS_ATTR_DMI
) == 0) {
2355 ip
->i_d
.di_mode
&= ~S_ISUID
;
2358 * Note that we don't have to worry about mandatory
2359 * file locking being disabled here because we only
2360 * clear the S_ISGID bit if the Group execute bit is
2361 * on, but if it was on then mandatory locking wouldn't
2362 * have been enabled.
2364 if (ip
->i_d
.di_mode
& S_IXGRP
)
2365 ip
->i_d
.di_mode
&= ~S_ISGID
;
2367 xfs_trans_ichgtime(tp
, ip
, XFS_ICHGTIME_MOD
| XFS_ICHGTIME_CHG
);
2370 ip
->i_d
.di_flags
|= XFS_DIFLAG_PREALLOC
;
2371 else if (clrprealloc
)
2372 ip
->i_d
.di_flags
&= ~XFS_DIFLAG_PREALLOC
;
2374 xfs_trans_log_inode(tp
, ip
, XFS_ILOG_CORE
);
2375 if (attr_flags
& XFS_ATTR_SYNC
)
2376 xfs_trans_set_sync(tp
);
2377 return xfs_trans_commit(tp
, 0);