2 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
3 * Copyright (c) 2012 Red Hat, Inc.
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation.
10 * This program is distributed in the hope that it would be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
21 #include "xfs_format.h"
22 #include "xfs_shared.h"
26 #include "xfs_trans.h"
29 #include "xfs_mount.h"
30 #include "xfs_da_btree.h"
31 #include "xfs_bmap_btree.h"
32 #include "xfs_alloc_btree.h"
33 #include "xfs_ialloc_btree.h"
34 #include "xfs_dinode.h"
35 #include "xfs_inode.h"
36 #include "xfs_btree.h"
37 #include "xfs_extfree_item.h"
38 #include "xfs_alloc.h"
40 #include "xfs_bmap_util.h"
41 #include "xfs_rtalloc.h"
42 #include "xfs_error.h"
43 #include "xfs_quota.h"
44 #include "xfs_trans_space.h"
45 #include "xfs_trace.h"
46 #include "xfs_icache.h"
48 /* Kernel only BMAP related definitions and functions */
51 * Convert the given file system block to a disk block. We have to treat it
52 * differently based on whether the file is a real time file or not, because the
56 xfs_fsb_to_db(struct xfs_inode
*ip
, xfs_fsblock_t fsb
)
58 return (XFS_IS_REALTIME_INODE(ip
) ? \
59 (xfs_daddr_t
)XFS_FSB_TO_BB((ip
)->i_mount
, (fsb
)) : \
60 XFS_FSB_TO_DADDR((ip
)->i_mount
, (fsb
)));
64 * Routine to be called at transaction's end by xfs_bmapi, xfs_bunmapi
65 * caller. Frees all the extents that need freeing, which must be done
66 * last due to locking considerations. We never free any extents in
67 * the first transaction.
69 * Return 1 if the given transaction was committed and a new one
70 * started, and 0 otherwise in the committed parameter.
74 xfs_trans_t
**tp
, /* transaction pointer addr */
75 xfs_bmap_free_t
*flist
, /* i/o: list extents to free */
76 int *committed
) /* xact committed or not */
78 xfs_efd_log_item_t
*efd
; /* extent free data */
79 xfs_efi_log_item_t
*efi
; /* extent free intention */
80 int error
; /* error return value */
81 xfs_bmap_free_item_t
*free
; /* free extent item */
82 struct xfs_trans_res tres
; /* new log reservation */
83 xfs_mount_t
*mp
; /* filesystem mount structure */
84 xfs_bmap_free_item_t
*next
; /* next item on free list */
85 xfs_trans_t
*ntp
; /* new transaction pointer */
87 ASSERT((*tp
)->t_flags
& XFS_TRANS_PERM_LOG_RES
);
88 if (flist
->xbf_count
== 0) {
93 efi
= xfs_trans_get_efi(ntp
, flist
->xbf_count
);
94 for (free
= flist
->xbf_first
; free
; free
= free
->xbfi_next
)
95 xfs_trans_log_efi_extent(ntp
, efi
, free
->xbfi_startblock
,
96 free
->xbfi_blockcount
);
98 tres
.tr_logres
= ntp
->t_log_res
;
99 tres
.tr_logcount
= ntp
->t_log_count
;
100 tres
.tr_logflags
= XFS_TRANS_PERM_LOG_RES
;
101 ntp
= xfs_trans_dup(*tp
);
102 error
= xfs_trans_commit(*tp
, 0);
106 * We have a new transaction, so we should return committed=1,
107 * even though we're returning an error.
113 * transaction commit worked ok so we can drop the extra ticket
114 * reference that we gained in xfs_trans_dup()
116 xfs_log_ticket_put(ntp
->t_ticket
);
118 error
= xfs_trans_reserve(ntp
, &tres
, 0, 0);
121 efd
= xfs_trans_get_efd(ntp
, efi
, flist
->xbf_count
);
122 for (free
= flist
->xbf_first
; free
!= NULL
; free
= next
) {
123 next
= free
->xbfi_next
;
124 if ((error
= xfs_free_extent(ntp
, free
->xbfi_startblock
,
125 free
->xbfi_blockcount
))) {
127 * The bmap free list will be cleaned up at a
128 * higher level. The EFI will be canceled when
129 * this transaction is aborted.
130 * Need to force shutdown here to make sure it
131 * happens, since this transaction may not be
135 if (!XFS_FORCED_SHUTDOWN(mp
))
136 xfs_force_shutdown(mp
,
137 (error
== EFSCORRUPTED
) ?
138 SHUTDOWN_CORRUPT_INCORE
:
139 SHUTDOWN_META_IO_ERROR
);
142 xfs_trans_log_efd_extent(ntp
, efd
, free
->xbfi_startblock
,
143 free
->xbfi_blockcount
);
144 xfs_bmap_del_free(flist
, NULL
, free
);
151 struct xfs_bmalloca
*ap
) /* bmap alloc argument struct */
153 xfs_alloctype_t atype
= 0; /* type for allocation routines */
154 int error
; /* error return value */
155 xfs_mount_t
*mp
; /* mount point structure */
156 xfs_extlen_t prod
= 0; /* product factor for allocators */
157 xfs_extlen_t ralen
= 0; /* realtime allocation length */
158 xfs_extlen_t align
; /* minimum allocation alignment */
161 mp
= ap
->ip
->i_mount
;
162 align
= xfs_get_extsz_hint(ap
->ip
);
163 prod
= align
/ mp
->m_sb
.sb_rextsize
;
164 error
= xfs_bmap_extsize_align(mp
, &ap
->got
, &ap
->prev
,
165 align
, 1, ap
->eof
, 0,
166 ap
->conv
, &ap
->offset
, &ap
->length
);
170 ASSERT(ap
->length
% mp
->m_sb
.sb_rextsize
== 0);
173 * If the offset & length are not perfectly aligned
174 * then kill prod, it will just get us in trouble.
176 if (do_mod(ap
->offset
, align
) || ap
->length
% align
)
179 * Set ralen to be the actual requested length in rtextents.
181 ralen
= ap
->length
/ mp
->m_sb
.sb_rextsize
;
183 * If the old value was close enough to MAXEXTLEN that
184 * we rounded up to it, cut it back so it's valid again.
185 * Note that if it's a really large request (bigger than
186 * MAXEXTLEN), we don't hear about that number, and can't
187 * adjust the starting point to match it.
189 if (ralen
* mp
->m_sb
.sb_rextsize
>= MAXEXTLEN
)
190 ralen
= MAXEXTLEN
/ mp
->m_sb
.sb_rextsize
;
193 * Lock out other modifications to the RT bitmap inode.
195 xfs_ilock(mp
->m_rbmip
, XFS_ILOCK_EXCL
);
196 xfs_trans_ijoin(ap
->tp
, mp
->m_rbmip
, XFS_ILOCK_EXCL
);
199 * If it's an allocation to an empty file at offset 0,
200 * pick an extent that will space things out in the rt area.
202 if (ap
->eof
&& ap
->offset
== 0) {
203 xfs_rtblock_t
uninitialized_var(rtx
); /* realtime extent no */
205 error
= xfs_rtpick_extent(mp
, ap
->tp
, ralen
, &rtx
);
208 ap
->blkno
= rtx
* mp
->m_sb
.sb_rextsize
;
213 xfs_bmap_adjacent(ap
);
216 * Realtime allocation, done through xfs_rtallocate_extent.
218 atype
= ap
->blkno
== 0 ? XFS_ALLOCTYPE_ANY_AG
: XFS_ALLOCTYPE_NEAR_BNO
;
219 do_div(ap
->blkno
, mp
->m_sb
.sb_rextsize
);
222 if ((error
= xfs_rtallocate_extent(ap
->tp
, ap
->blkno
, 1, ap
->length
,
223 &ralen
, atype
, ap
->wasdel
, prod
, &rtb
)))
225 if (rtb
== NULLFSBLOCK
&& prod
> 1 &&
226 (error
= xfs_rtallocate_extent(ap
->tp
, ap
->blkno
, 1,
227 ap
->length
, &ralen
, atype
,
228 ap
->wasdel
, 1, &rtb
)))
231 if (ap
->blkno
!= NULLFSBLOCK
) {
232 ap
->blkno
*= mp
->m_sb
.sb_rextsize
;
233 ralen
*= mp
->m_sb
.sb_rextsize
;
235 ap
->ip
->i_d
.di_nblocks
+= ralen
;
236 xfs_trans_log_inode(ap
->tp
, ap
->ip
, XFS_ILOG_CORE
);
238 ap
->ip
->i_delayed_blks
-= ralen
;
240 * Adjust the disk quota also. This was reserved
243 xfs_trans_mod_dquot_byino(ap
->tp
, ap
->ip
,
244 ap
->wasdel
? XFS_TRANS_DQ_DELRTBCOUNT
:
245 XFS_TRANS_DQ_RTBCOUNT
, (long) ralen
);
253 * Stack switching interfaces for allocation
256 xfs_bmapi_allocate_worker(
257 struct work_struct
*work
)
259 struct xfs_bmalloca
*args
= container_of(work
,
260 struct xfs_bmalloca
, work
);
261 unsigned long pflags
;
263 /* we are in a transaction context here */
264 current_set_flags_nested(&pflags
, PF_FSTRANS
);
266 args
->result
= __xfs_bmapi_allocate(args
);
267 complete(args
->done
);
269 current_restore_flags_nested(&pflags
, PF_FSTRANS
);
273 * Some allocation requests often come in with little stack to work on. Push
274 * them off to a worker thread so there is lots of stack to use. Otherwise just
275 * call directly to avoid the context switch overhead here.
279 struct xfs_bmalloca
*args
)
281 DECLARE_COMPLETION_ONSTACK(done
);
283 if (!args
->stack_switch
)
284 return __xfs_bmapi_allocate(args
);
288 INIT_WORK_ONSTACK(&args
->work
, xfs_bmapi_allocate_worker
);
289 queue_work(xfs_alloc_wq
, &args
->work
);
290 wait_for_completion(&done
);
295 * Check if the endoff is outside the last extent. If so the caller will grow
296 * the allocation to a stripe unit boundary. All offsets are considered outside
297 * the end of file for an empty fork, so 1 is returned in *eof in that case.
301 struct xfs_inode
*ip
,
302 xfs_fileoff_t endoff
,
306 struct xfs_bmbt_irec rec
;
309 error
= xfs_bmap_last_extent(NULL
, ip
, whichfork
, &rec
, eof
);
313 *eof
= endoff
>= rec
.br_startoff
+ rec
.br_blockcount
;
318 * Extent tree block counting routines.
322 * Count leaf blocks given a range of extent records.
325 xfs_bmap_count_leaves(
333 for (b
= 0; b
< numrecs
; b
++) {
334 xfs_bmbt_rec_host_t
*frp
= xfs_iext_get_ext(ifp
, idx
+ b
);
335 *count
+= xfs_bmbt_get_blockcount(frp
);
340 * Count leaf blocks given a range of extent records originally
344 xfs_bmap_disk_count_leaves(
345 struct xfs_mount
*mp
,
346 struct xfs_btree_block
*block
,
353 for (b
= 1; b
<= numrecs
; b
++) {
354 frp
= XFS_BMBT_REC_ADDR(mp
, block
, b
);
355 *count
+= xfs_bmbt_disk_get_blockcount(frp
);
360 * Recursively walks each level of a btree
361 * to count total fsblocks in use.
363 STATIC
int /* error */
365 xfs_mount_t
*mp
, /* file system mount point */
366 xfs_trans_t
*tp
, /* transaction pointer */
367 xfs_ifork_t
*ifp
, /* inode fork pointer */
368 xfs_fsblock_t blockno
, /* file system block number */
369 int levelin
, /* level in btree */
370 int *count
) /* Count of blocks */
376 xfs_fsblock_t bno
= blockno
;
377 xfs_fsblock_t nextbno
;
378 struct xfs_btree_block
*block
, *nextblock
;
381 error
= xfs_btree_read_bufl(mp
, tp
, bno
, 0, &bp
, XFS_BMAP_BTREE_REF
,
386 block
= XFS_BUF_TO_BLOCK(bp
);
389 /* Not at node above leaves, count this level of nodes */
390 nextbno
= be64_to_cpu(block
->bb_u
.l
.bb_rightsib
);
391 while (nextbno
!= NULLFSBLOCK
) {
392 error
= xfs_btree_read_bufl(mp
, tp
, nextbno
, 0, &nbp
,
398 nextblock
= XFS_BUF_TO_BLOCK(nbp
);
399 nextbno
= be64_to_cpu(nextblock
->bb_u
.l
.bb_rightsib
);
400 xfs_trans_brelse(tp
, nbp
);
403 /* Dive to the next level */
404 pp
= XFS_BMBT_PTR_ADDR(mp
, block
, 1, mp
->m_bmap_dmxr
[1]);
405 bno
= be64_to_cpu(*pp
);
406 if (unlikely((error
=
407 xfs_bmap_count_tree(mp
, tp
, ifp
, bno
, level
, count
)) < 0)) {
408 xfs_trans_brelse(tp
, bp
);
409 XFS_ERROR_REPORT("xfs_bmap_count_tree(1)",
410 XFS_ERRLEVEL_LOW
, mp
);
411 return XFS_ERROR(EFSCORRUPTED
);
413 xfs_trans_brelse(tp
, bp
);
415 /* count all level 1 nodes and their leaves */
417 nextbno
= be64_to_cpu(block
->bb_u
.l
.bb_rightsib
);
418 numrecs
= be16_to_cpu(block
->bb_numrecs
);
419 xfs_bmap_disk_count_leaves(mp
, block
, numrecs
, count
);
420 xfs_trans_brelse(tp
, bp
);
421 if (nextbno
== NULLFSBLOCK
)
424 error
= xfs_btree_read_bufl(mp
, tp
, bno
, 0, &bp
,
430 block
= XFS_BUF_TO_BLOCK(bp
);
437 * Count fsblocks of the given fork.
440 xfs_bmap_count_blocks(
441 xfs_trans_t
*tp
, /* transaction pointer */
442 xfs_inode_t
*ip
, /* incore inode */
443 int whichfork
, /* data or attr fork */
444 int *count
) /* out: count of blocks */
446 struct xfs_btree_block
*block
; /* current btree block */
447 xfs_fsblock_t bno
; /* block # of "block" */
448 xfs_ifork_t
*ifp
; /* fork structure */
449 int level
; /* btree level, for checking */
450 xfs_mount_t
*mp
; /* file system mount structure */
451 __be64
*pp
; /* pointer to block address */
455 ifp
= XFS_IFORK_PTR(ip
, whichfork
);
456 if ( XFS_IFORK_FORMAT(ip
, whichfork
) == XFS_DINODE_FMT_EXTENTS
) {
457 xfs_bmap_count_leaves(ifp
, 0,
458 ifp
->if_bytes
/ (uint
)sizeof(xfs_bmbt_rec_t
),
464 * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
466 block
= ifp
->if_broot
;
467 level
= be16_to_cpu(block
->bb_level
);
469 pp
= XFS_BMAP_BROOT_PTR_ADDR(mp
, block
, 1, ifp
->if_broot_bytes
);
470 bno
= be64_to_cpu(*pp
);
471 ASSERT(bno
!= NULLDFSBNO
);
472 ASSERT(XFS_FSB_TO_AGNO(mp
, bno
) < mp
->m_sb
.sb_agcount
);
473 ASSERT(XFS_FSB_TO_AGBNO(mp
, bno
) < mp
->m_sb
.sb_agblocks
);
475 if (unlikely(xfs_bmap_count_tree(mp
, tp
, ifp
, bno
, level
, count
) < 0)) {
476 XFS_ERROR_REPORT("xfs_bmap_count_blocks(2)", XFS_ERRLEVEL_LOW
,
478 return XFS_ERROR(EFSCORRUPTED
);
485 * returns 1 for success, 0 if we failed to map the extent.
488 xfs_getbmapx_fix_eof_hole(
489 xfs_inode_t
*ip
, /* xfs incore inode pointer */
490 struct getbmapx
*out
, /* output structure */
491 int prealloced
, /* this is a file with
492 * preallocated data space */
493 __int64_t end
, /* last block requested */
494 xfs_fsblock_t startblock
)
497 xfs_mount_t
*mp
; /* file system mount point */
498 xfs_ifork_t
*ifp
; /* inode fork pointer */
499 xfs_extnum_t lastx
; /* last extent pointer */
500 xfs_fileoff_t fileblock
;
502 if (startblock
== HOLESTARTBLOCK
) {
505 fixlen
= XFS_FSB_TO_BB(mp
, XFS_B_TO_FSB(mp
, XFS_ISIZE(ip
)));
506 fixlen
-= out
->bmv_offset
;
507 if (prealloced
&& out
->bmv_offset
+ out
->bmv_length
== end
) {
508 /* Came to hole at EOF. Trim it. */
511 out
->bmv_length
= fixlen
;
514 if (startblock
== DELAYSTARTBLOCK
)
517 out
->bmv_block
= xfs_fsb_to_db(ip
, startblock
);
518 fileblock
= XFS_BB_TO_FSB(ip
->i_mount
, out
->bmv_offset
);
519 ifp
= XFS_IFORK_PTR(ip
, XFS_DATA_FORK
);
520 if (xfs_iext_bno_to_ext(ifp
, fileblock
, &lastx
) &&
521 (lastx
== (ifp
->if_bytes
/ (uint
)sizeof(xfs_bmbt_rec_t
))-1))
522 out
->bmv_oflags
|= BMV_OF_LAST
;
529 * Get inode's extents as described in bmv, and format for output.
530 * Calls formatter to fill the user's buffer until all extents
531 * are mapped, until the passed-in bmv->bmv_count slots have
532 * been filled, or until the formatter short-circuits the loop,
533 * if it is tracking filled-in extents on its own.
538 struct getbmapx
*bmv
, /* user bmap structure */
539 xfs_bmap_format_t formatter
, /* format to user */
540 void *arg
) /* formatter arg */
542 __int64_t bmvend
; /* last block requested */
543 int error
= 0; /* return value */
544 __int64_t fixlen
; /* length for -1 case */
545 int i
; /* extent number */
546 int lock
; /* lock state */
547 xfs_bmbt_irec_t
*map
; /* buffer for user's data */
548 xfs_mount_t
*mp
; /* file system mount point */
549 int nex
; /* # of user extents can do */
550 int nexleft
; /* # of user extents left */
551 int subnex
; /* # of bmapi's can do */
552 int nmap
; /* number of map entries */
553 struct getbmapx
*out
; /* output structure */
554 int whichfork
; /* data or attr fork */
555 int prealloced
; /* this is a file with
556 * preallocated data space */
557 int iflags
; /* interface flags */
558 int bmapi_flags
; /* flags for xfs_bmapi */
562 iflags
= bmv
->bmv_iflags
;
563 whichfork
= iflags
& BMV_IF_ATTRFORK
? XFS_ATTR_FORK
: XFS_DATA_FORK
;
565 if (whichfork
== XFS_ATTR_FORK
) {
566 if (XFS_IFORK_Q(ip
)) {
567 if (ip
->i_d
.di_aformat
!= XFS_DINODE_FMT_EXTENTS
&&
568 ip
->i_d
.di_aformat
!= XFS_DINODE_FMT_BTREE
&&
569 ip
->i_d
.di_aformat
!= XFS_DINODE_FMT_LOCAL
)
570 return XFS_ERROR(EINVAL
);
572 ip
->i_d
.di_aformat
!= 0 &&
573 ip
->i_d
.di_aformat
!= XFS_DINODE_FMT_EXTENTS
)) {
574 XFS_ERROR_REPORT("xfs_getbmap", XFS_ERRLEVEL_LOW
,
576 return XFS_ERROR(EFSCORRUPTED
);
582 if (ip
->i_d
.di_format
!= XFS_DINODE_FMT_EXTENTS
&&
583 ip
->i_d
.di_format
!= XFS_DINODE_FMT_BTREE
&&
584 ip
->i_d
.di_format
!= XFS_DINODE_FMT_LOCAL
)
585 return XFS_ERROR(EINVAL
);
587 if (xfs_get_extsz_hint(ip
) ||
588 ip
->i_d
.di_flags
& (XFS_DIFLAG_PREALLOC
|XFS_DIFLAG_APPEND
)){
590 fixlen
= mp
->m_super
->s_maxbytes
;
593 fixlen
= XFS_ISIZE(ip
);
597 if (bmv
->bmv_length
== -1) {
598 fixlen
= XFS_FSB_TO_BB(mp
, XFS_B_TO_FSB(mp
, fixlen
));
600 max_t(__int64_t
, fixlen
- bmv
->bmv_offset
, 0);
601 } else if (bmv
->bmv_length
== 0) {
602 bmv
->bmv_entries
= 0;
604 } else if (bmv
->bmv_length
< 0) {
605 return XFS_ERROR(EINVAL
);
608 nex
= bmv
->bmv_count
- 1;
610 return XFS_ERROR(EINVAL
);
611 bmvend
= bmv
->bmv_offset
+ bmv
->bmv_length
;
614 if (bmv
->bmv_count
> ULONG_MAX
/ sizeof(struct getbmapx
))
615 return XFS_ERROR(ENOMEM
);
616 out
= kmem_zalloc_large(bmv
->bmv_count
* sizeof(struct getbmapx
), 0);
618 return XFS_ERROR(ENOMEM
);
620 xfs_ilock(ip
, XFS_IOLOCK_SHARED
);
621 if (whichfork
== XFS_DATA_FORK
&& !(iflags
& BMV_IF_DELALLOC
)) {
622 if (ip
->i_delayed_blks
|| XFS_ISIZE(ip
) > ip
->i_d
.di_size
) {
623 error
= -filemap_write_and_wait(VFS_I(ip
)->i_mapping
);
625 goto out_unlock_iolock
;
628 * even after flushing the inode, there can still be delalloc
629 * blocks on the inode beyond EOF due to speculative
630 * preallocation. These are not removed until the release
631 * function is called or the inode is inactivated. Hence we
632 * cannot assert here that ip->i_delayed_blks == 0.
636 lock
= xfs_ilock_map_shared(ip
);
639 * Don't let nex be bigger than the number of extents
640 * we can have assuming alternating holes and real extents.
642 if (nex
> XFS_IFORK_NEXTENTS(ip
, whichfork
) * 2 + 1)
643 nex
= XFS_IFORK_NEXTENTS(ip
, whichfork
) * 2 + 1;
645 bmapi_flags
= xfs_bmapi_aflag(whichfork
);
646 if (!(iflags
& BMV_IF_PREALLOC
))
647 bmapi_flags
|= XFS_BMAPI_IGSTATE
;
650 * Allocate enough space to handle "subnex" maps at a time.
654 map
= kmem_alloc(subnex
* sizeof(*map
), KM_MAYFAIL
| KM_NOFS
);
656 goto out_unlock_ilock
;
658 bmv
->bmv_entries
= 0;
660 if (XFS_IFORK_NEXTENTS(ip
, whichfork
) == 0 &&
661 (whichfork
== XFS_ATTR_FORK
|| !(iflags
& BMV_IF_DELALLOC
))) {
669 nmap
= (nexleft
> subnex
) ? subnex
: nexleft
;
670 error
= xfs_bmapi_read(ip
, XFS_BB_TO_FSBT(mp
, bmv
->bmv_offset
),
671 XFS_BB_TO_FSB(mp
, bmv
->bmv_length
),
672 map
, &nmap
, bmapi_flags
);
675 ASSERT(nmap
<= subnex
);
677 for (i
= 0; i
< nmap
&& nexleft
&& bmv
->bmv_length
; i
++) {
678 out
[cur_ext
].bmv_oflags
= 0;
679 if (map
[i
].br_state
== XFS_EXT_UNWRITTEN
)
680 out
[cur_ext
].bmv_oflags
|= BMV_OF_PREALLOC
;
681 else if (map
[i
].br_startblock
== DELAYSTARTBLOCK
)
682 out
[cur_ext
].bmv_oflags
|= BMV_OF_DELALLOC
;
683 out
[cur_ext
].bmv_offset
=
684 XFS_FSB_TO_BB(mp
, map
[i
].br_startoff
);
685 out
[cur_ext
].bmv_length
=
686 XFS_FSB_TO_BB(mp
, map
[i
].br_blockcount
);
687 out
[cur_ext
].bmv_unused1
= 0;
688 out
[cur_ext
].bmv_unused2
= 0;
691 * delayed allocation extents that start beyond EOF can
692 * occur due to speculative EOF allocation when the
693 * delalloc extent is larger than the largest freespace
694 * extent at conversion time. These extents cannot be
695 * converted by data writeback, so can exist here even
696 * if we are not supposed to be finding delalloc
699 if (map
[i
].br_startblock
== DELAYSTARTBLOCK
&&
700 map
[i
].br_startoff
<= XFS_B_TO_FSB(mp
, XFS_ISIZE(ip
)))
701 ASSERT((iflags
& BMV_IF_DELALLOC
) != 0);
703 if (map
[i
].br_startblock
== HOLESTARTBLOCK
&&
704 whichfork
== XFS_ATTR_FORK
) {
705 /* came to the end of attribute fork */
706 out
[cur_ext
].bmv_oflags
|= BMV_OF_LAST
;
710 if (!xfs_getbmapx_fix_eof_hole(ip
, &out
[cur_ext
],
712 map
[i
].br_startblock
))
716 out
[cur_ext
].bmv_offset
+
717 out
[cur_ext
].bmv_length
;
719 max_t(__int64_t
, 0, bmvend
- bmv
->bmv_offset
);
722 * In case we don't want to return the hole,
723 * don't increase cur_ext so that we can reuse
724 * it in the next loop.
726 if ((iflags
& BMV_IF_NO_HOLES
) &&
727 map
[i
].br_startblock
== HOLESTARTBLOCK
) {
728 memset(&out
[cur_ext
], 0, sizeof(out
[cur_ext
]));
736 } while (nmap
&& nexleft
&& bmv
->bmv_length
);
741 xfs_iunlock_map_shared(ip
, lock
);
743 xfs_iunlock(ip
, XFS_IOLOCK_SHARED
);
745 for (i
= 0; i
< cur_ext
; i
++) {
746 int full
= 0; /* user array is full */
748 /* format results & advance arg */
749 error
= formatter(&arg
, &out
[i
], &full
);
759 * dead simple method of punching delalyed allocation blocks from a range in
760 * the inode. Walks a block at a time so will be slow, but is only executed in
761 * rare error cases so the overhead is not critical. This will always punch out
762 * both the start and end blocks, even if the ranges only partially overlap
763 * them, so it is up to the caller to ensure that partial blocks are not
767 xfs_bmap_punch_delalloc_range(
768 struct xfs_inode
*ip
,
769 xfs_fileoff_t start_fsb
,
770 xfs_fileoff_t length
)
772 xfs_fileoff_t remaining
= length
;
775 ASSERT(xfs_isilocked(ip
, XFS_ILOCK_EXCL
));
779 xfs_bmbt_irec_t imap
;
781 xfs_fsblock_t firstblock
;
782 xfs_bmap_free_t flist
;
785 * Map the range first and check that it is a delalloc extent
786 * before trying to unmap the range. Otherwise we will be
787 * trying to remove a real extent (which requires a
788 * transaction) or a hole, which is probably a bad idea...
790 error
= xfs_bmapi_read(ip
, start_fsb
, 1, &imap
, &nimaps
,
794 /* something screwed, just bail */
795 if (!XFS_FORCED_SHUTDOWN(ip
->i_mount
)) {
796 xfs_alert(ip
->i_mount
,
797 "Failed delalloc mapping lookup ino %lld fsb %lld.",
798 ip
->i_ino
, start_fsb
);
806 if (imap
.br_startblock
!= DELAYSTARTBLOCK
) {
807 /* been converted, ignore */
810 WARN_ON(imap
.br_blockcount
== 0);
813 * Note: while we initialise the firstblock/flist pair, they
814 * should never be used because blocks should never be
815 * allocated or freed for a delalloc extent and hence we need
816 * don't cancel or finish them after the xfs_bunmapi() call.
818 xfs_bmap_init(&flist
, &firstblock
);
819 error
= xfs_bunmapi(NULL
, ip
, start_fsb
, 1, 0, 1, &firstblock
,
824 ASSERT(!flist
.xbf_count
&& !flist
.xbf_first
);
828 } while(remaining
> 0);
834 * Test whether it is appropriate to check an inode for and free post EOF
835 * blocks. The 'force' parameter determines whether we should also consider
836 * regular files that are marked preallocated or append-only.
839 xfs_can_free_eofblocks(struct xfs_inode
*ip
, bool force
)
841 /* prealloc/delalloc exists only on regular files */
842 if (!S_ISREG(ip
->i_d
.di_mode
))
846 * Zero sized files with no cached pages and delalloc blocks will not
847 * have speculative prealloc/delalloc blocks to remove.
849 if (VFS_I(ip
)->i_size
== 0 &&
850 VN_CACHED(VFS_I(ip
)) == 0 &&
851 ip
->i_delayed_blks
== 0)
854 /* If we haven't read in the extent list, then don't do it now. */
855 if (!(ip
->i_df
.if_flags
& XFS_IFEXTENTS
))
859 * Do not free real preallocated or append-only files unless the file
860 * has delalloc blocks and we are forced to remove them.
862 if (ip
->i_d
.di_flags
& (XFS_DIFLAG_PREALLOC
| XFS_DIFLAG_APPEND
))
863 if (!force
|| ip
->i_delayed_blks
== 0)
870 * This is called by xfs_inactive to free any blocks beyond eof
871 * when the link count isn't zero and by xfs_dm_punch_hole() when
872 * punching a hole to EOF.
882 xfs_fileoff_t end_fsb
;
883 xfs_fileoff_t last_fsb
;
884 xfs_filblks_t map_len
;
886 xfs_bmbt_irec_t imap
;
889 * Figure out if there are any blocks beyond the end
890 * of the file. If not, then there is nothing to do.
892 end_fsb
= XFS_B_TO_FSB(mp
, (xfs_ufsize_t
)XFS_ISIZE(ip
));
893 last_fsb
= XFS_B_TO_FSB(mp
, mp
->m_super
->s_maxbytes
);
894 if (last_fsb
<= end_fsb
)
896 map_len
= last_fsb
- end_fsb
;
899 xfs_ilock(ip
, XFS_ILOCK_SHARED
);
900 error
= xfs_bmapi_read(ip
, end_fsb
, map_len
, &imap
, &nimaps
, 0);
901 xfs_iunlock(ip
, XFS_ILOCK_SHARED
);
903 if (!error
&& (nimaps
!= 0) &&
904 (imap
.br_startblock
!= HOLESTARTBLOCK
||
905 ip
->i_delayed_blks
)) {
907 * Attach the dquots to the inode up front.
909 error
= xfs_qm_dqattach(ip
, 0);
914 * There are blocks after the end of file.
915 * Free them up now by truncating the file to
918 tp
= xfs_trans_alloc(mp
, XFS_TRANS_INACTIVE
);
921 if (!xfs_ilock_nowait(ip
, XFS_IOLOCK_EXCL
)) {
922 xfs_trans_cancel(tp
, 0);
927 error
= xfs_trans_reserve(tp
, &M_RES(mp
)->tr_itruncate
, 0, 0);
929 ASSERT(XFS_FORCED_SHUTDOWN(mp
));
930 xfs_trans_cancel(tp
, 0);
932 xfs_iunlock(ip
, XFS_IOLOCK_EXCL
);
936 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
937 xfs_trans_ijoin(tp
, ip
, 0);
940 * Do not update the on-disk file size. If we update the
941 * on-disk file size and then the system crashes before the
942 * contents of the file are flushed to disk then the files
943 * may be full of holes (ie NULL files bug).
945 error
= xfs_itruncate_extents(&tp
, ip
, XFS_DATA_FORK
,
949 * If we get an error at this point we simply don't
950 * bother truncating the file.
953 (XFS_TRANS_RELEASE_LOG_RES
|
956 error
= xfs_trans_commit(tp
,
957 XFS_TRANS_RELEASE_LOG_RES
);
959 xfs_inode_clear_eofblocks_tag(ip
);
962 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
964 xfs_iunlock(ip
, XFS_IOLOCK_EXCL
);
970 xfs_alloc_file_space(
971 struct xfs_inode
*ip
,
976 xfs_mount_t
*mp
= ip
->i_mount
;
978 xfs_filblks_t allocated_fsb
;
979 xfs_filblks_t allocatesize_fsb
;
980 xfs_extlen_t extsz
, temp
;
981 xfs_fileoff_t startoffset_fsb
;
982 xfs_fsblock_t firstfsb
;
987 xfs_bmbt_irec_t imaps
[1], *imapp
;
988 xfs_bmap_free_t free_list
;
989 uint qblocks
, resblks
, resrtextents
;
993 trace_xfs_alloc_file_space(ip
);
995 if (XFS_FORCED_SHUTDOWN(mp
))
996 return XFS_ERROR(EIO
);
998 error
= xfs_qm_dqattach(ip
, 0);
1003 return XFS_ERROR(EINVAL
);
1005 rt
= XFS_IS_REALTIME_INODE(ip
);
1006 extsz
= xfs_get_extsz_hint(ip
);
1011 startoffset_fsb
= XFS_B_TO_FSBT(mp
, offset
);
1012 allocatesize_fsb
= XFS_B_TO_FSB(mp
, count
);
1015 * Allocate file space until done or until there is an error
1017 while (allocatesize_fsb
&& !error
) {
1021 * Determine space reservations for data/realtime.
1023 if (unlikely(extsz
)) {
1024 s
= startoffset_fsb
;
1027 e
= startoffset_fsb
+ allocatesize_fsb
;
1028 if ((temp
= do_mod(startoffset_fsb
, extsz
)))
1030 if ((temp
= do_mod(e
, extsz
)))
1034 e
= allocatesize_fsb
;
1038 * The transaction reservation is limited to a 32-bit block
1039 * count, hence we need to limit the number of blocks we are
1040 * trying to reserve to avoid an overflow. We can't allocate
1041 * more than @nimaps extents, and an extent is limited on disk
1042 * to MAXEXTLEN (21 bits), so use that to enforce the limit.
1044 resblks
= min_t(xfs_fileoff_t
, (e
- s
), (MAXEXTLEN
* nimaps
));
1046 resrtextents
= qblocks
= resblks
;
1047 resrtextents
/= mp
->m_sb
.sb_rextsize
;
1048 resblks
= XFS_DIOSTRAT_SPACE_RES(mp
, 0);
1049 quota_flag
= XFS_QMOPT_RES_RTBLKS
;
1052 resblks
= qblocks
= XFS_DIOSTRAT_SPACE_RES(mp
, resblks
);
1053 quota_flag
= XFS_QMOPT_RES_REGBLKS
;
1057 * Allocate and setup the transaction.
1059 tp
= xfs_trans_alloc(mp
, XFS_TRANS_DIOSTRAT
);
1060 error
= xfs_trans_reserve(tp
, &M_RES(mp
)->tr_write
,
1061 resblks
, resrtextents
);
1063 * Check for running out of space
1067 * Free the transaction structure.
1069 ASSERT(error
== ENOSPC
|| XFS_FORCED_SHUTDOWN(mp
));
1070 xfs_trans_cancel(tp
, 0);
1073 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
1074 error
= xfs_trans_reserve_quota_nblks(tp
, ip
, qblocks
,
1079 xfs_trans_ijoin(tp
, ip
, 0);
1081 xfs_bmap_init(&free_list
, &firstfsb
);
1082 error
= xfs_bmapi_write(tp
, ip
, startoffset_fsb
,
1083 allocatesize_fsb
, alloc_type
, &firstfsb
,
1084 0, imapp
, &nimaps
, &free_list
);
1090 * Complete the transaction
1092 error
= xfs_bmap_finish(&tp
, &free_list
, &committed
);
1097 error
= xfs_trans_commit(tp
, XFS_TRANS_RELEASE_LOG_RES
);
1098 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
1103 allocated_fsb
= imapp
->br_blockcount
;
1106 error
= XFS_ERROR(ENOSPC
);
1110 startoffset_fsb
+= allocated_fsb
;
1111 allocatesize_fsb
-= allocated_fsb
;
1116 error0
: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */
1117 xfs_bmap_cancel(&free_list
);
1118 xfs_trans_unreserve_quota_nblks(tp
, ip
, (long)qblocks
, 0, quota_flag
);
1120 error1
: /* Just cancel transaction */
1121 xfs_trans_cancel(tp
, XFS_TRANS_RELEASE_LOG_RES
| XFS_TRANS_ABORT
);
1122 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
1127 * Zero file bytes between startoff and endoff inclusive.
1128 * The iolock is held exclusive and no blocks are buffered.
1130 * This function is used by xfs_free_file_space() to zero
1131 * partial blocks when the range to free is not block aligned.
1132 * When unreserving space with boundaries that are not block
1133 * aligned we round up the start and round down the end
1134 * boundaries and then use this function to zero the parts of
1135 * the blocks that got dropped during the rounding.
1138 xfs_zero_remaining_bytes(
1143 xfs_bmbt_irec_t imap
;
1144 xfs_fileoff_t offset_fsb
;
1145 xfs_off_t lastoffset
;
1148 xfs_mount_t
*mp
= ip
->i_mount
;
1153 * Avoid doing I/O beyond eof - it's not necessary
1154 * since nothing can read beyond eof. The space will
1155 * be zeroed when the file is extended anyway.
1157 if (startoff
>= XFS_ISIZE(ip
))
1160 if (endoff
> XFS_ISIZE(ip
))
1161 endoff
= XFS_ISIZE(ip
);
1163 bp
= xfs_buf_get_uncached(XFS_IS_REALTIME_INODE(ip
) ?
1164 mp
->m_rtdev_targp
: mp
->m_ddev_targp
,
1165 BTOBB(mp
->m_sb
.sb_blocksize
), 0);
1167 return XFS_ERROR(ENOMEM
);
1171 for (offset
= startoff
; offset
<= endoff
; offset
= lastoffset
+ 1) {
1172 offset_fsb
= XFS_B_TO_FSBT(mp
, offset
);
1174 error
= xfs_bmapi_read(ip
, offset_fsb
, 1, &imap
, &nimap
, 0);
1175 if (error
|| nimap
< 1)
1177 ASSERT(imap
.br_blockcount
>= 1);
1178 ASSERT(imap
.br_startoff
== offset_fsb
);
1179 lastoffset
= XFS_FSB_TO_B(mp
, imap
.br_startoff
+ 1) - 1;
1180 if (lastoffset
> endoff
)
1181 lastoffset
= endoff
;
1182 if (imap
.br_startblock
== HOLESTARTBLOCK
)
1184 ASSERT(imap
.br_startblock
!= DELAYSTARTBLOCK
);
1185 if (imap
.br_state
== XFS_EXT_UNWRITTEN
)
1188 XFS_BUF_UNWRITE(bp
);
1190 XFS_BUF_SET_ADDR(bp
, xfs_fsb_to_db(ip
, imap
.br_startblock
));
1192 error
= xfs_buf_iowait(bp
);
1194 xfs_buf_ioerror_alert(bp
,
1195 "xfs_zero_remaining_bytes(read)");
1199 (offset
- XFS_FSB_TO_B(mp
, imap
.br_startoff
)),
1200 0, lastoffset
- offset
+ 1);
1205 error
= xfs_buf_iowait(bp
);
1207 xfs_buf_ioerror_alert(bp
,
1208 "xfs_zero_remaining_bytes(write)");
1217 xfs_free_file_space(
1218 struct xfs_inode
*ip
,
1224 xfs_fileoff_t endoffset_fsb
;
1226 xfs_fsblock_t firstfsb
;
1227 xfs_bmap_free_t free_list
;
1228 xfs_bmbt_irec_t imap
;
1236 xfs_fileoff_t startoffset_fsb
;
1241 trace_xfs_free_file_space(ip
);
1243 error
= xfs_qm_dqattach(ip
, 0);
1248 if (len
<= 0) /* if nothing being freed */
1250 rt
= XFS_IS_REALTIME_INODE(ip
);
1251 startoffset_fsb
= XFS_B_TO_FSB(mp
, offset
);
1252 endoffset_fsb
= XFS_B_TO_FSBT(mp
, offset
+ len
);
1254 /* wait for the completion of any pending DIOs */
1255 inode_dio_wait(VFS_I(ip
));
1257 rounding
= max_t(xfs_off_t
, 1 << mp
->m_sb
.sb_blocklog
, PAGE_CACHE_SIZE
);
1258 ioffset
= offset
& ~(rounding
- 1);
1259 error
= -filemap_write_and_wait_range(VFS_I(ip
)->i_mapping
,
1263 truncate_pagecache_range(VFS_I(ip
), ioffset
, -1);
1266 * Need to zero the stuff we're not freeing, on disk.
1267 * If it's a realtime file & can't use unwritten extents then we
1268 * actually need to zero the extent edges. Otherwise xfs_bunmapi
1269 * will take care of it for us.
1271 if (rt
&& !xfs_sb_version_hasextflgbit(&mp
->m_sb
)) {
1273 error
= xfs_bmapi_read(ip
, startoffset_fsb
, 1,
1277 ASSERT(nimap
== 0 || nimap
== 1);
1278 if (nimap
&& imap
.br_startblock
!= HOLESTARTBLOCK
) {
1281 ASSERT(imap
.br_startblock
!= DELAYSTARTBLOCK
);
1282 block
= imap
.br_startblock
;
1283 mod
= do_div(block
, mp
->m_sb
.sb_rextsize
);
1285 startoffset_fsb
+= mp
->m_sb
.sb_rextsize
- mod
;
1288 error
= xfs_bmapi_read(ip
, endoffset_fsb
- 1, 1,
1292 ASSERT(nimap
== 0 || nimap
== 1);
1293 if (nimap
&& imap
.br_startblock
!= HOLESTARTBLOCK
) {
1294 ASSERT(imap
.br_startblock
!= DELAYSTARTBLOCK
);
1296 if (mod
&& (mod
!= mp
->m_sb
.sb_rextsize
))
1297 endoffset_fsb
-= mod
;
1300 if ((done
= (endoffset_fsb
<= startoffset_fsb
)))
1302 * One contiguous piece to clear
1304 error
= xfs_zero_remaining_bytes(ip
, offset
, offset
+ len
- 1);
1307 * Some full blocks, possibly two pieces to clear
1309 if (offset
< XFS_FSB_TO_B(mp
, startoffset_fsb
))
1310 error
= xfs_zero_remaining_bytes(ip
, offset
,
1311 XFS_FSB_TO_B(mp
, startoffset_fsb
) - 1);
1313 XFS_FSB_TO_B(mp
, endoffset_fsb
) < offset
+ len
)
1314 error
= xfs_zero_remaining_bytes(ip
,
1315 XFS_FSB_TO_B(mp
, endoffset_fsb
),
1320 * free file space until done or until there is an error
1322 resblks
= XFS_DIOSTRAT_SPACE_RES(mp
, 0);
1323 while (!error
&& !done
) {
1326 * allocate and setup the transaction. Allow this
1327 * transaction to dip into the reserve blocks to ensure
1328 * the freeing of the space succeeds at ENOSPC.
1330 tp
= xfs_trans_alloc(mp
, XFS_TRANS_DIOSTRAT
);
1331 tp
->t_flags
|= XFS_TRANS_RESERVE
;
1332 error
= xfs_trans_reserve(tp
, &M_RES(mp
)->tr_write
, resblks
, 0);
1335 * check for running out of space
1339 * Free the transaction structure.
1341 ASSERT(error
== ENOSPC
|| XFS_FORCED_SHUTDOWN(mp
));
1342 xfs_trans_cancel(tp
, 0);
1345 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
1346 error
= xfs_trans_reserve_quota(tp
, mp
,
1347 ip
->i_udquot
, ip
->i_gdquot
, ip
->i_pdquot
,
1348 resblks
, 0, XFS_QMOPT_RES_REGBLKS
);
1352 xfs_trans_ijoin(tp
, ip
, 0);
1355 * issue the bunmapi() call to free the blocks
1357 xfs_bmap_init(&free_list
, &firstfsb
);
1358 error
= xfs_bunmapi(tp
, ip
, startoffset_fsb
,
1359 endoffset_fsb
- startoffset_fsb
,
1360 0, 2, &firstfsb
, &free_list
, &done
);
1366 * complete the transaction
1368 error
= xfs_bmap_finish(&tp
, &free_list
, &committed
);
1373 error
= xfs_trans_commit(tp
, XFS_TRANS_RELEASE_LOG_RES
);
1374 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
1381 xfs_bmap_cancel(&free_list
);
1383 xfs_trans_cancel(tp
, XFS_TRANS_RELEASE_LOG_RES
| XFS_TRANS_ABORT
);
1384 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
1390 xfs_zero_file_space(
1391 struct xfs_inode
*ip
,
1395 struct xfs_mount
*mp
= ip
->i_mount
;
1397 xfs_off_t start_boundary
;
1398 xfs_off_t end_boundary
;
1401 granularity
= max_t(uint
, 1 << mp
->m_sb
.sb_blocklog
, PAGE_CACHE_SIZE
);
1404 * Round the range of extents we are going to convert inwards. If the
1405 * offset is aligned, then it doesn't get changed so we zero from the
1406 * start of the block offset points to.
1408 start_boundary
= round_up(offset
, granularity
);
1409 end_boundary
= round_down(offset
+ len
, granularity
);
1411 ASSERT(start_boundary
>= offset
);
1412 ASSERT(end_boundary
<= offset
+ len
);
1414 if (start_boundary
< end_boundary
- 1) {
1415 /* punch out the page cache over the conversion range */
1416 truncate_pagecache_range(VFS_I(ip
), start_boundary
,
1418 /* convert the blocks */
1419 error
= xfs_alloc_file_space(ip
, start_boundary
,
1420 end_boundary
- start_boundary
- 1,
1421 XFS_BMAPI_PREALLOC
| XFS_BMAPI_CONVERT
);
1425 /* We've handled the interior of the range, now for the edges */
1426 if (start_boundary
!= offset
) {
1427 error
= xfs_iozero(ip
, offset
, start_boundary
- offset
);
1432 if (end_boundary
!= offset
+ len
)
1433 error
= xfs_iozero(ip
, end_boundary
,
1434 offset
+ len
- end_boundary
);
1438 * It's either a sub-granularity range or the range spanned lies
1439 * partially across two adjacent blocks.
1441 error
= xfs_iozero(ip
, offset
, len
);
1450 * We need to check that the format of the data fork in the temporary inode is
1451 * valid for the target inode before doing the swap. This is not a problem with
1452 * attr1 because of the fixed fork offset, but attr2 has a dynamically sized
1453 * data fork depending on the space the attribute fork is taking so we can get
1454 * invalid formats on the target inode.
1456 * E.g. target has space for 7 extents in extent format, temp inode only has
1457 * space for 6. If we defragment down to 7 extents, then the tmp format is a
1458 * btree, but when swapped it needs to be in extent format. Hence we can't just
1459 * blindly swap data forks on attr2 filesystems.
1461 * Note that we check the swap in both directions so that we don't end up with
1462 * a corrupt temporary inode, either.
1464 * Note that fixing the way xfs_fsr sets up the attribute fork in the source
1465 * inode will prevent this situation from occurring, so all we do here is
1466 * reject and log the attempt. basically we are putting the responsibility on
1467 * userspace to get this right.
1470 xfs_swap_extents_check_format(
1471 xfs_inode_t
*ip
, /* target inode */
1472 xfs_inode_t
*tip
) /* tmp inode */
1475 /* Should never get a local format */
1476 if (ip
->i_d
.di_format
== XFS_DINODE_FMT_LOCAL
||
1477 tip
->i_d
.di_format
== XFS_DINODE_FMT_LOCAL
)
1481 * if the target inode has less extents that then temporary inode then
1482 * why did userspace call us?
1484 if (ip
->i_d
.di_nextents
< tip
->i_d
.di_nextents
)
1488 * if the target inode is in extent form and the temp inode is in btree
1489 * form then we will end up with the target inode in the wrong format
1490 * as we already know there are less extents in the temp inode.
1492 if (ip
->i_d
.di_format
== XFS_DINODE_FMT_EXTENTS
&&
1493 tip
->i_d
.di_format
== XFS_DINODE_FMT_BTREE
)
1496 /* Check temp in extent form to max in target */
1497 if (tip
->i_d
.di_format
== XFS_DINODE_FMT_EXTENTS
&&
1498 XFS_IFORK_NEXTENTS(tip
, XFS_DATA_FORK
) >
1499 XFS_IFORK_MAXEXT(ip
, XFS_DATA_FORK
))
1502 /* Check target in extent form to max in temp */
1503 if (ip
->i_d
.di_format
== XFS_DINODE_FMT_EXTENTS
&&
1504 XFS_IFORK_NEXTENTS(ip
, XFS_DATA_FORK
) >
1505 XFS_IFORK_MAXEXT(tip
, XFS_DATA_FORK
))
1509 * If we are in a btree format, check that the temp root block will fit
1510 * in the target and that it has enough extents to be in btree format
1513 * Note that we have to be careful to allow btree->extent conversions
1514 * (a common defrag case) which will occur when the temp inode is in
1517 if (tip
->i_d
.di_format
== XFS_DINODE_FMT_BTREE
) {
1518 if (XFS_IFORK_BOFF(ip
) &&
1519 XFS_BMAP_BMDR_SPACE(tip
->i_df
.if_broot
) > XFS_IFORK_BOFF(ip
))
1521 if (XFS_IFORK_NEXTENTS(tip
, XFS_DATA_FORK
) <=
1522 XFS_IFORK_MAXEXT(ip
, XFS_DATA_FORK
))
1526 /* Reciprocal target->temp btree format checks */
1527 if (ip
->i_d
.di_format
== XFS_DINODE_FMT_BTREE
) {
1528 if (XFS_IFORK_BOFF(tip
) &&
1529 XFS_BMAP_BMDR_SPACE(ip
->i_df
.if_broot
) > XFS_IFORK_BOFF(tip
))
1531 if (XFS_IFORK_NEXTENTS(ip
, XFS_DATA_FORK
) <=
1532 XFS_IFORK_MAXEXT(tip
, XFS_DATA_FORK
))
1541 xfs_inode_t
*ip
, /* target inode */
1542 xfs_inode_t
*tip
, /* tmp inode */
1545 xfs_mount_t
*mp
= ip
->i_mount
;
1547 xfs_bstat_t
*sbp
= &sxp
->sx_stat
;
1548 xfs_ifork_t
*tempifp
, *ifp
, *tifp
;
1549 int src_log_flags
, target_log_flags
;
1555 tempifp
= kmem_alloc(sizeof(xfs_ifork_t
), KM_MAYFAIL
);
1557 error
= XFS_ERROR(ENOMEM
);
1562 * we have to do two separate lock calls here to keep lockdep
1563 * happy. If we try to get all the locks in one call, lock will
1564 * report false positives when we drop the ILOCK and regain them
1567 xfs_lock_two_inodes(ip
, tip
, XFS_IOLOCK_EXCL
);
1568 xfs_lock_two_inodes(ip
, tip
, XFS_ILOCK_EXCL
);
1570 /* Verify that both files have the same format */
1571 if ((ip
->i_d
.di_mode
& S_IFMT
) != (tip
->i_d
.di_mode
& S_IFMT
)) {
1572 error
= XFS_ERROR(EINVAL
);
1576 /* Verify both files are either real-time or non-realtime */
1577 if (XFS_IS_REALTIME_INODE(ip
) != XFS_IS_REALTIME_INODE(tip
)) {
1578 error
= XFS_ERROR(EINVAL
);
1582 error
= -filemap_write_and_wait(VFS_I(tip
)->i_mapping
);
1585 truncate_pagecache_range(VFS_I(tip
), 0, -1);
1587 /* Verify O_DIRECT for ftmp */
1588 if (VN_CACHED(VFS_I(tip
)) != 0) {
1589 error
= XFS_ERROR(EINVAL
);
1593 /* Verify all data are being swapped */
1594 if (sxp
->sx_offset
!= 0 ||
1595 sxp
->sx_length
!= ip
->i_d
.di_size
||
1596 sxp
->sx_length
!= tip
->i_d
.di_size
) {
1597 error
= XFS_ERROR(EFAULT
);
1601 trace_xfs_swap_extent_before(ip
, 0);
1602 trace_xfs_swap_extent_before(tip
, 1);
1604 /* check inode formats now that data is flushed */
1605 error
= xfs_swap_extents_check_format(ip
, tip
);
1608 "%s: inode 0x%llx format is incompatible for exchanging.",
1609 __func__
, ip
->i_ino
);
1614 * Compare the current change & modify times with that
1615 * passed in. If they differ, we abort this swap.
1616 * This is the mechanism used to ensure the calling
1617 * process that the file was not changed out from
1620 if ((sbp
->bs_ctime
.tv_sec
!= VFS_I(ip
)->i_ctime
.tv_sec
) ||
1621 (sbp
->bs_ctime
.tv_nsec
!= VFS_I(ip
)->i_ctime
.tv_nsec
) ||
1622 (sbp
->bs_mtime
.tv_sec
!= VFS_I(ip
)->i_mtime
.tv_sec
) ||
1623 (sbp
->bs_mtime
.tv_nsec
!= VFS_I(ip
)->i_mtime
.tv_nsec
)) {
1624 error
= XFS_ERROR(EBUSY
);
1628 /* We need to fail if the file is memory mapped. Once we have tossed
1629 * all existing pages, the page fault will have no option
1630 * but to go to the filesystem for pages. By making the page fault call
1631 * vop_read (or write in the case of autogrow) they block on the iolock
1632 * until we have switched the extents.
1634 if (VN_MAPPED(VFS_I(ip
))) {
1635 error
= XFS_ERROR(EBUSY
);
1639 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
1640 xfs_iunlock(tip
, XFS_ILOCK_EXCL
);
1643 * There is a race condition here since we gave up the
1644 * ilock. However, the data fork will not change since
1645 * we have the iolock (locked for truncation too) so we
1646 * are safe. We don't really care if non-io related
1649 truncate_pagecache_range(VFS_I(ip
), 0, -1);
1651 tp
= xfs_trans_alloc(mp
, XFS_TRANS_SWAPEXT
);
1652 error
= xfs_trans_reserve(tp
, &M_RES(mp
)->tr_ichange
, 0, 0);
1654 xfs_iunlock(ip
, XFS_IOLOCK_EXCL
);
1655 xfs_iunlock(tip
, XFS_IOLOCK_EXCL
);
1656 xfs_trans_cancel(tp
, 0);
1659 xfs_lock_two_inodes(ip
, tip
, XFS_ILOCK_EXCL
);
1662 * Count the number of extended attribute blocks
1664 if ( ((XFS_IFORK_Q(ip
) != 0) && (ip
->i_d
.di_anextents
> 0)) &&
1665 (ip
->i_d
.di_aformat
!= XFS_DINODE_FMT_LOCAL
)) {
1666 error
= xfs_bmap_count_blocks(tp
, ip
, XFS_ATTR_FORK
, &aforkblks
);
1668 goto out_trans_cancel
;
1670 if ( ((XFS_IFORK_Q(tip
) != 0) && (tip
->i_d
.di_anextents
> 0)) &&
1671 (tip
->i_d
.di_aformat
!= XFS_DINODE_FMT_LOCAL
)) {
1672 error
= xfs_bmap_count_blocks(tp
, tip
, XFS_ATTR_FORK
,
1675 goto out_trans_cancel
;
1678 xfs_trans_ijoin(tp
, ip
, XFS_ILOCK_EXCL
| XFS_IOLOCK_EXCL
);
1679 xfs_trans_ijoin(tp
, tip
, XFS_ILOCK_EXCL
| XFS_IOLOCK_EXCL
);
1682 * Before we've swapped the forks, lets set the owners of the forks
1683 * appropriately. We have to do this as we are demand paging the btree
1684 * buffers, and so the validation done on read will expect the owner
1685 * field to be correctly set. Once we change the owners, we can swap the
1688 * Note the trickiness in setting the log flags - we set the owner log
1689 * flag on the opposite inode (i.e. the inode we are setting the new
1690 * owner to be) because once we swap the forks and log that, log
1691 * recovery is going to see the fork as owned by the swapped inode,
1692 * not the pre-swapped inodes.
1694 src_log_flags
= XFS_ILOG_CORE
;
1695 target_log_flags
= XFS_ILOG_CORE
;
1696 if (ip
->i_d
.di_version
== 3 &&
1697 ip
->i_d
.di_format
== XFS_DINODE_FMT_BTREE
) {
1698 target_log_flags
|= XFS_ILOG_DOWNER
;
1699 error
= xfs_bmbt_change_owner(tp
, ip
, XFS_DATA_FORK
,
1702 goto out_trans_cancel
;
1705 if (tip
->i_d
.di_version
== 3 &&
1706 tip
->i_d
.di_format
== XFS_DINODE_FMT_BTREE
) {
1707 src_log_flags
|= XFS_ILOG_DOWNER
;
1708 error
= xfs_bmbt_change_owner(tp
, tip
, XFS_DATA_FORK
,
1711 goto out_trans_cancel
;
1715 * Swap the data forks of the inodes
1719 *tempifp
= *ifp
; /* struct copy */
1720 *ifp
= *tifp
; /* struct copy */
1721 *tifp
= *tempifp
; /* struct copy */
1724 * Fix the on-disk inode values
1726 tmp
= (__uint64_t
)ip
->i_d
.di_nblocks
;
1727 ip
->i_d
.di_nblocks
= tip
->i_d
.di_nblocks
- taforkblks
+ aforkblks
;
1728 tip
->i_d
.di_nblocks
= tmp
+ taforkblks
- aforkblks
;
1730 tmp
= (__uint64_t
) ip
->i_d
.di_nextents
;
1731 ip
->i_d
.di_nextents
= tip
->i_d
.di_nextents
;
1732 tip
->i_d
.di_nextents
= tmp
;
1734 tmp
= (__uint64_t
) ip
->i_d
.di_format
;
1735 ip
->i_d
.di_format
= tip
->i_d
.di_format
;
1736 tip
->i_d
.di_format
= tmp
;
1739 * The extents in the source inode could still contain speculative
1740 * preallocation beyond EOF (e.g. the file is open but not modified
1741 * while defrag is in progress). In that case, we need to copy over the
1742 * number of delalloc blocks the data fork in the source inode is
1743 * tracking beyond EOF so that when the fork is truncated away when the
1744 * temporary inode is unlinked we don't underrun the i_delayed_blks
1745 * counter on that inode.
1747 ASSERT(tip
->i_delayed_blks
== 0);
1748 tip
->i_delayed_blks
= ip
->i_delayed_blks
;
1749 ip
->i_delayed_blks
= 0;
1751 switch (ip
->i_d
.di_format
) {
1752 case XFS_DINODE_FMT_EXTENTS
:
1753 /* If the extents fit in the inode, fix the
1754 * pointer. Otherwise it's already NULL or
1755 * pointing to the extent.
1757 if (ip
->i_d
.di_nextents
<= XFS_INLINE_EXTS
) {
1758 ifp
->if_u1
.if_extents
=
1759 ifp
->if_u2
.if_inline_ext
;
1761 src_log_flags
|= XFS_ILOG_DEXT
;
1763 case XFS_DINODE_FMT_BTREE
:
1764 ASSERT(ip
->i_d
.di_version
< 3 ||
1765 (src_log_flags
& XFS_ILOG_DOWNER
));
1766 src_log_flags
|= XFS_ILOG_DBROOT
;
1770 switch (tip
->i_d
.di_format
) {
1771 case XFS_DINODE_FMT_EXTENTS
:
1772 /* If the extents fit in the inode, fix the
1773 * pointer. Otherwise it's already NULL or
1774 * pointing to the extent.
1776 if (tip
->i_d
.di_nextents
<= XFS_INLINE_EXTS
) {
1777 tifp
->if_u1
.if_extents
=
1778 tifp
->if_u2
.if_inline_ext
;
1780 target_log_flags
|= XFS_ILOG_DEXT
;
1782 case XFS_DINODE_FMT_BTREE
:
1783 target_log_flags
|= XFS_ILOG_DBROOT
;
1784 ASSERT(tip
->i_d
.di_version
< 3 ||
1785 (target_log_flags
& XFS_ILOG_DOWNER
));
1789 xfs_trans_log_inode(tp
, ip
, src_log_flags
);
1790 xfs_trans_log_inode(tp
, tip
, target_log_flags
);
1793 * If this is a synchronous mount, make sure that the
1794 * transaction goes to disk before returning to the user.
1796 if (mp
->m_flags
& XFS_MOUNT_WSYNC
)
1797 xfs_trans_set_sync(tp
);
1799 error
= xfs_trans_commit(tp
, 0);
1801 trace_xfs_swap_extent_after(ip
, 0);
1802 trace_xfs_swap_extent_after(tip
, 1);
1808 xfs_iunlock(ip
, XFS_ILOCK_EXCL
| XFS_IOLOCK_EXCL
);
1809 xfs_iunlock(tip
, XFS_ILOCK_EXCL
| XFS_IOLOCK_EXCL
);
1813 xfs_trans_cancel(tp
, 0);