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_shared.h"
22 #include "xfs_format.h"
23 #include "xfs_log_format.h"
24 #include "xfs_trans_resv.h"
28 #include "xfs_mount.h"
29 #include "xfs_da_format.h"
30 #include "xfs_inode.h"
31 #include "xfs_btree.h"
32 #include "xfs_trans.h"
33 #include "xfs_extfree_item.h"
34 #include "xfs_alloc.h"
36 #include "xfs_bmap_util.h"
37 #include "xfs_bmap_btree.h"
38 #include "xfs_rtalloc.h"
39 #include "xfs_error.h"
40 #include "xfs_quota.h"
41 #include "xfs_trans_space.h"
42 #include "xfs_trace.h"
43 #include "xfs_icache.h"
45 #include "xfs_dinode.h"
47 /* Kernel only BMAP related definitions and functions */
50 * Convert the given file system block to a disk block. We have to treat it
51 * differently based on whether the file is a real time file or not, because the
55 xfs_fsb_to_db(struct xfs_inode
*ip
, xfs_fsblock_t fsb
)
57 return (XFS_IS_REALTIME_INODE(ip
) ? \
58 (xfs_daddr_t
)XFS_FSB_TO_BB((ip
)->i_mount
, (fsb
)) : \
59 XFS_FSB_TO_DADDR((ip
)->i_mount
, (fsb
)));
63 * Routine to be called at transaction's end by xfs_bmapi, xfs_bunmapi
64 * caller. Frees all the extents that need freeing, which must be done
65 * last due to locking considerations. We never free any extents in
66 * the first transaction.
68 * Return 1 if the given transaction was committed and a new one
69 * started, and 0 otherwise in the committed parameter.
73 xfs_trans_t
**tp
, /* transaction pointer addr */
74 xfs_bmap_free_t
*flist
, /* i/o: list extents to free */
75 int *committed
) /* xact committed or not */
77 xfs_efd_log_item_t
*efd
; /* extent free data */
78 xfs_efi_log_item_t
*efi
; /* extent free intention */
79 int error
; /* error return value */
80 xfs_bmap_free_item_t
*free
; /* free extent item */
81 struct xfs_trans_res tres
; /* new log reservation */
82 xfs_mount_t
*mp
; /* filesystem mount structure */
83 xfs_bmap_free_item_t
*next
; /* next item on free list */
84 xfs_trans_t
*ntp
; /* new transaction pointer */
86 ASSERT((*tp
)->t_flags
& XFS_TRANS_PERM_LOG_RES
);
87 if (flist
->xbf_count
== 0) {
92 efi
= xfs_trans_get_efi(ntp
, flist
->xbf_count
);
93 for (free
= flist
->xbf_first
; free
; free
= free
->xbfi_next
)
94 xfs_trans_log_efi_extent(ntp
, efi
, free
->xbfi_startblock
,
95 free
->xbfi_blockcount
);
97 tres
.tr_logres
= ntp
->t_log_res
;
98 tres
.tr_logcount
= ntp
->t_log_count
;
99 tres
.tr_logflags
= XFS_TRANS_PERM_LOG_RES
;
100 ntp
= xfs_trans_dup(*tp
);
101 error
= xfs_trans_commit(*tp
, 0);
105 * We have a new transaction, so we should return committed=1,
106 * even though we're returning an error.
112 * transaction commit worked ok so we can drop the extra ticket
113 * reference that we gained in xfs_trans_dup()
115 xfs_log_ticket_put(ntp
->t_ticket
);
117 error
= xfs_trans_reserve(ntp
, &tres
, 0, 0);
120 efd
= xfs_trans_get_efd(ntp
, efi
, flist
->xbf_count
);
121 for (free
= flist
->xbf_first
; free
!= NULL
; free
= next
) {
122 next
= free
->xbfi_next
;
123 if ((error
= xfs_free_extent(ntp
, free
->xbfi_startblock
,
124 free
->xbfi_blockcount
))) {
126 * The bmap free list will be cleaned up at a
127 * higher level. The EFI will be canceled when
128 * this transaction is aborted.
129 * Need to force shutdown here to make sure it
130 * happens, since this transaction may not be
134 if (!XFS_FORCED_SHUTDOWN(mp
))
135 xfs_force_shutdown(mp
,
136 (error
== -EFSCORRUPTED
) ?
137 SHUTDOWN_CORRUPT_INCORE
:
138 SHUTDOWN_META_IO_ERROR
);
141 xfs_trans_log_efd_extent(ntp
, efd
, free
->xbfi_startblock
,
142 free
->xbfi_blockcount
);
143 xfs_bmap_del_free(flist
, NULL
, free
);
150 struct xfs_bmalloca
*ap
) /* bmap alloc argument struct */
152 xfs_alloctype_t atype
= 0; /* type for allocation routines */
153 int error
; /* error return value */
154 xfs_mount_t
*mp
; /* mount point structure */
155 xfs_extlen_t prod
= 0; /* product factor for allocators */
156 xfs_extlen_t ralen
= 0; /* realtime allocation length */
157 xfs_extlen_t align
; /* minimum allocation alignment */
160 mp
= ap
->ip
->i_mount
;
161 align
= xfs_get_extsz_hint(ap
->ip
);
162 prod
= align
/ mp
->m_sb
.sb_rextsize
;
163 error
= xfs_bmap_extsize_align(mp
, &ap
->got
, &ap
->prev
,
164 align
, 1, ap
->eof
, 0,
165 ap
->conv
, &ap
->offset
, &ap
->length
);
169 ASSERT(ap
->length
% mp
->m_sb
.sb_rextsize
== 0);
172 * If the offset & length are not perfectly aligned
173 * then kill prod, it will just get us in trouble.
175 if (do_mod(ap
->offset
, align
) || ap
->length
% align
)
178 * Set ralen to be the actual requested length in rtextents.
180 ralen
= ap
->length
/ mp
->m_sb
.sb_rextsize
;
182 * If the old value was close enough to MAXEXTLEN that
183 * we rounded up to it, cut it back so it's valid again.
184 * Note that if it's a really large request (bigger than
185 * MAXEXTLEN), we don't hear about that number, and can't
186 * adjust the starting point to match it.
188 if (ralen
* mp
->m_sb
.sb_rextsize
>= MAXEXTLEN
)
189 ralen
= MAXEXTLEN
/ mp
->m_sb
.sb_rextsize
;
192 * Lock out other modifications to the RT bitmap inode.
194 xfs_ilock(mp
->m_rbmip
, XFS_ILOCK_EXCL
);
195 xfs_trans_ijoin(ap
->tp
, mp
->m_rbmip
, XFS_ILOCK_EXCL
);
198 * If it's an allocation to an empty file at offset 0,
199 * pick an extent that will space things out in the rt area.
201 if (ap
->eof
&& ap
->offset
== 0) {
202 xfs_rtblock_t
uninitialized_var(rtx
); /* realtime extent no */
204 error
= xfs_rtpick_extent(mp
, ap
->tp
, ralen
, &rtx
);
207 ap
->blkno
= rtx
* mp
->m_sb
.sb_rextsize
;
212 xfs_bmap_adjacent(ap
);
215 * Realtime allocation, done through xfs_rtallocate_extent.
217 atype
= ap
->blkno
== 0 ? XFS_ALLOCTYPE_ANY_AG
: XFS_ALLOCTYPE_NEAR_BNO
;
218 do_div(ap
->blkno
, mp
->m_sb
.sb_rextsize
);
221 if ((error
= xfs_rtallocate_extent(ap
->tp
, ap
->blkno
, 1, ap
->length
,
222 &ralen
, atype
, ap
->wasdel
, prod
, &rtb
)))
224 if (rtb
== NULLFSBLOCK
&& prod
> 1 &&
225 (error
= xfs_rtallocate_extent(ap
->tp
, ap
->blkno
, 1,
226 ap
->length
, &ralen
, atype
,
227 ap
->wasdel
, 1, &rtb
)))
230 if (ap
->blkno
!= NULLFSBLOCK
) {
231 ap
->blkno
*= mp
->m_sb
.sb_rextsize
;
232 ralen
*= mp
->m_sb
.sb_rextsize
;
234 ap
->ip
->i_d
.di_nblocks
+= ralen
;
235 xfs_trans_log_inode(ap
->tp
, ap
->ip
, XFS_ILOG_CORE
);
237 ap
->ip
->i_delayed_blks
-= ralen
;
239 * Adjust the disk quota also. This was reserved
242 xfs_trans_mod_dquot_byino(ap
->tp
, ap
->ip
,
243 ap
->wasdel
? XFS_TRANS_DQ_DELRTBCOUNT
:
244 XFS_TRANS_DQ_RTBCOUNT
, (long) ralen
);
252 * Check if the endoff is outside the last extent. If so the caller will grow
253 * the allocation to a stripe unit boundary. All offsets are considered outside
254 * the end of file for an empty fork, so 1 is returned in *eof in that case.
258 struct xfs_inode
*ip
,
259 xfs_fileoff_t endoff
,
263 struct xfs_bmbt_irec rec
;
266 error
= xfs_bmap_last_extent(NULL
, ip
, whichfork
, &rec
, eof
);
270 *eof
= endoff
>= rec
.br_startoff
+ rec
.br_blockcount
;
275 * Extent tree block counting routines.
279 * Count leaf blocks given a range of extent records.
282 xfs_bmap_count_leaves(
290 for (b
= 0; b
< numrecs
; b
++) {
291 xfs_bmbt_rec_host_t
*frp
= xfs_iext_get_ext(ifp
, idx
+ b
);
292 *count
+= xfs_bmbt_get_blockcount(frp
);
297 * Count leaf blocks given a range of extent records originally
301 xfs_bmap_disk_count_leaves(
302 struct xfs_mount
*mp
,
303 struct xfs_btree_block
*block
,
310 for (b
= 1; b
<= numrecs
; b
++) {
311 frp
= XFS_BMBT_REC_ADDR(mp
, block
, b
);
312 *count
+= xfs_bmbt_disk_get_blockcount(frp
);
317 * Recursively walks each level of a btree
318 * to count total fsblocks in use.
320 STATIC
int /* error */
322 xfs_mount_t
*mp
, /* file system mount point */
323 xfs_trans_t
*tp
, /* transaction pointer */
324 xfs_ifork_t
*ifp
, /* inode fork pointer */
325 xfs_fsblock_t blockno
, /* file system block number */
326 int levelin
, /* level in btree */
327 int *count
) /* Count of blocks */
333 xfs_fsblock_t bno
= blockno
;
334 xfs_fsblock_t nextbno
;
335 struct xfs_btree_block
*block
, *nextblock
;
338 error
= xfs_btree_read_bufl(mp
, tp
, bno
, 0, &bp
, XFS_BMAP_BTREE_REF
,
343 block
= XFS_BUF_TO_BLOCK(bp
);
346 /* Not at node above leaves, count this level of nodes */
347 nextbno
= be64_to_cpu(block
->bb_u
.l
.bb_rightsib
);
348 while (nextbno
!= NULLFSBLOCK
) {
349 error
= xfs_btree_read_bufl(mp
, tp
, nextbno
, 0, &nbp
,
355 nextblock
= XFS_BUF_TO_BLOCK(nbp
);
356 nextbno
= be64_to_cpu(nextblock
->bb_u
.l
.bb_rightsib
);
357 xfs_trans_brelse(tp
, nbp
);
360 /* Dive to the next level */
361 pp
= XFS_BMBT_PTR_ADDR(mp
, block
, 1, mp
->m_bmap_dmxr
[1]);
362 bno
= be64_to_cpu(*pp
);
363 if (unlikely((error
=
364 xfs_bmap_count_tree(mp
, tp
, ifp
, bno
, level
, count
)) < 0)) {
365 xfs_trans_brelse(tp
, bp
);
366 XFS_ERROR_REPORT("xfs_bmap_count_tree(1)",
367 XFS_ERRLEVEL_LOW
, mp
);
368 return -EFSCORRUPTED
;
370 xfs_trans_brelse(tp
, bp
);
372 /* count all level 1 nodes and their leaves */
374 nextbno
= be64_to_cpu(block
->bb_u
.l
.bb_rightsib
);
375 numrecs
= be16_to_cpu(block
->bb_numrecs
);
376 xfs_bmap_disk_count_leaves(mp
, block
, numrecs
, count
);
377 xfs_trans_brelse(tp
, bp
);
378 if (nextbno
== NULLFSBLOCK
)
381 error
= xfs_btree_read_bufl(mp
, tp
, bno
, 0, &bp
,
387 block
= XFS_BUF_TO_BLOCK(bp
);
394 * Count fsblocks of the given fork.
397 xfs_bmap_count_blocks(
398 xfs_trans_t
*tp
, /* transaction pointer */
399 xfs_inode_t
*ip
, /* incore inode */
400 int whichfork
, /* data or attr fork */
401 int *count
) /* out: count of blocks */
403 struct xfs_btree_block
*block
; /* current btree block */
404 xfs_fsblock_t bno
; /* block # of "block" */
405 xfs_ifork_t
*ifp
; /* fork structure */
406 int level
; /* btree level, for checking */
407 xfs_mount_t
*mp
; /* file system mount structure */
408 __be64
*pp
; /* pointer to block address */
412 ifp
= XFS_IFORK_PTR(ip
, whichfork
);
413 if ( XFS_IFORK_FORMAT(ip
, whichfork
) == XFS_DINODE_FMT_EXTENTS
) {
414 xfs_bmap_count_leaves(ifp
, 0,
415 ifp
->if_bytes
/ (uint
)sizeof(xfs_bmbt_rec_t
),
421 * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
423 block
= ifp
->if_broot
;
424 level
= be16_to_cpu(block
->bb_level
);
426 pp
= XFS_BMAP_BROOT_PTR_ADDR(mp
, block
, 1, ifp
->if_broot_bytes
);
427 bno
= be64_to_cpu(*pp
);
428 ASSERT(bno
!= NULLFSBLOCK
);
429 ASSERT(XFS_FSB_TO_AGNO(mp
, bno
) < mp
->m_sb
.sb_agcount
);
430 ASSERT(XFS_FSB_TO_AGBNO(mp
, bno
) < mp
->m_sb
.sb_agblocks
);
432 if (unlikely(xfs_bmap_count_tree(mp
, tp
, ifp
, bno
, level
, count
) < 0)) {
433 XFS_ERROR_REPORT("xfs_bmap_count_blocks(2)", XFS_ERRLEVEL_LOW
,
435 return -EFSCORRUPTED
;
442 * returns 1 for success, 0 if we failed to map the extent.
445 xfs_getbmapx_fix_eof_hole(
446 xfs_inode_t
*ip
, /* xfs incore inode pointer */
447 struct getbmapx
*out
, /* output structure */
448 int prealloced
, /* this is a file with
449 * preallocated data space */
450 __int64_t end
, /* last block requested */
451 xfs_fsblock_t startblock
)
454 xfs_mount_t
*mp
; /* file system mount point */
455 xfs_ifork_t
*ifp
; /* inode fork pointer */
456 xfs_extnum_t lastx
; /* last extent pointer */
457 xfs_fileoff_t fileblock
;
459 if (startblock
== HOLESTARTBLOCK
) {
462 fixlen
= XFS_FSB_TO_BB(mp
, XFS_B_TO_FSB(mp
, XFS_ISIZE(ip
)));
463 fixlen
-= out
->bmv_offset
;
464 if (prealloced
&& out
->bmv_offset
+ out
->bmv_length
== end
) {
465 /* Came to hole at EOF. Trim it. */
468 out
->bmv_length
= fixlen
;
471 if (startblock
== DELAYSTARTBLOCK
)
474 out
->bmv_block
= xfs_fsb_to_db(ip
, startblock
);
475 fileblock
= XFS_BB_TO_FSB(ip
->i_mount
, out
->bmv_offset
);
476 ifp
= XFS_IFORK_PTR(ip
, XFS_DATA_FORK
);
477 if (xfs_iext_bno_to_ext(ifp
, fileblock
, &lastx
) &&
478 (lastx
== (ifp
->if_bytes
/ (uint
)sizeof(xfs_bmbt_rec_t
))-1))
479 out
->bmv_oflags
|= BMV_OF_LAST
;
486 * Get inode's extents as described in bmv, and format for output.
487 * Calls formatter to fill the user's buffer until all extents
488 * are mapped, until the passed-in bmv->bmv_count slots have
489 * been filled, or until the formatter short-circuits the loop,
490 * if it is tracking filled-in extents on its own.
495 struct getbmapx
*bmv
, /* user bmap structure */
496 xfs_bmap_format_t formatter
, /* format to user */
497 void *arg
) /* formatter arg */
499 __int64_t bmvend
; /* last block requested */
500 int error
= 0; /* return value */
501 __int64_t fixlen
; /* length for -1 case */
502 int i
; /* extent number */
503 int lock
; /* lock state */
504 xfs_bmbt_irec_t
*map
; /* buffer for user's data */
505 xfs_mount_t
*mp
; /* file system mount point */
506 int nex
; /* # of user extents can do */
507 int nexleft
; /* # of user extents left */
508 int subnex
; /* # of bmapi's can do */
509 int nmap
; /* number of map entries */
510 struct getbmapx
*out
; /* output structure */
511 int whichfork
; /* data or attr fork */
512 int prealloced
; /* this is a file with
513 * preallocated data space */
514 int iflags
; /* interface flags */
515 int bmapi_flags
; /* flags for xfs_bmapi */
519 iflags
= bmv
->bmv_iflags
;
520 whichfork
= iflags
& BMV_IF_ATTRFORK
? XFS_ATTR_FORK
: XFS_DATA_FORK
;
522 if (whichfork
== XFS_ATTR_FORK
) {
523 if (XFS_IFORK_Q(ip
)) {
524 if (ip
->i_d
.di_aformat
!= XFS_DINODE_FMT_EXTENTS
&&
525 ip
->i_d
.di_aformat
!= XFS_DINODE_FMT_BTREE
&&
526 ip
->i_d
.di_aformat
!= XFS_DINODE_FMT_LOCAL
)
529 ip
->i_d
.di_aformat
!= 0 &&
530 ip
->i_d
.di_aformat
!= XFS_DINODE_FMT_EXTENTS
)) {
531 XFS_ERROR_REPORT("xfs_getbmap", XFS_ERRLEVEL_LOW
,
533 return -EFSCORRUPTED
;
539 if (ip
->i_d
.di_format
!= XFS_DINODE_FMT_EXTENTS
&&
540 ip
->i_d
.di_format
!= XFS_DINODE_FMT_BTREE
&&
541 ip
->i_d
.di_format
!= XFS_DINODE_FMT_LOCAL
)
544 if (xfs_get_extsz_hint(ip
) ||
545 ip
->i_d
.di_flags
& (XFS_DIFLAG_PREALLOC
|XFS_DIFLAG_APPEND
)){
547 fixlen
= mp
->m_super
->s_maxbytes
;
550 fixlen
= XFS_ISIZE(ip
);
554 if (bmv
->bmv_length
== -1) {
555 fixlen
= XFS_FSB_TO_BB(mp
, XFS_B_TO_FSB(mp
, fixlen
));
557 max_t(__int64_t
, fixlen
- bmv
->bmv_offset
, 0);
558 } else if (bmv
->bmv_length
== 0) {
559 bmv
->bmv_entries
= 0;
561 } else if (bmv
->bmv_length
< 0) {
565 nex
= bmv
->bmv_count
- 1;
568 bmvend
= bmv
->bmv_offset
+ bmv
->bmv_length
;
571 if (bmv
->bmv_count
> ULONG_MAX
/ sizeof(struct getbmapx
))
573 out
= kmem_zalloc_large(bmv
->bmv_count
* sizeof(struct getbmapx
), 0);
577 xfs_ilock(ip
, XFS_IOLOCK_SHARED
);
578 if (whichfork
== XFS_DATA_FORK
) {
579 if (!(iflags
& BMV_IF_DELALLOC
) &&
580 (ip
->i_delayed_blks
|| XFS_ISIZE(ip
) > ip
->i_d
.di_size
)) {
581 error
= filemap_write_and_wait(VFS_I(ip
)->i_mapping
);
583 goto out_unlock_iolock
;
586 * Even after flushing the inode, there can still be
587 * delalloc blocks on the inode beyond EOF due to
588 * speculative preallocation. These are not removed
589 * until the release function is called or the inode
590 * is inactivated. Hence we cannot assert here that
591 * ip->i_delayed_blks == 0.
595 lock
= xfs_ilock_data_map_shared(ip
);
597 lock
= xfs_ilock_attr_map_shared(ip
);
601 * Don't let nex be bigger than the number of extents
602 * we can have assuming alternating holes and real extents.
604 if (nex
> XFS_IFORK_NEXTENTS(ip
, whichfork
) * 2 + 1)
605 nex
= XFS_IFORK_NEXTENTS(ip
, whichfork
) * 2 + 1;
607 bmapi_flags
= xfs_bmapi_aflag(whichfork
);
608 if (!(iflags
& BMV_IF_PREALLOC
))
609 bmapi_flags
|= XFS_BMAPI_IGSTATE
;
612 * Allocate enough space to handle "subnex" maps at a time.
616 map
= kmem_alloc(subnex
* sizeof(*map
), KM_MAYFAIL
| KM_NOFS
);
618 goto out_unlock_ilock
;
620 bmv
->bmv_entries
= 0;
622 if (XFS_IFORK_NEXTENTS(ip
, whichfork
) == 0 &&
623 (whichfork
== XFS_ATTR_FORK
|| !(iflags
& BMV_IF_DELALLOC
))) {
631 nmap
= (nexleft
> subnex
) ? subnex
: nexleft
;
632 error
= xfs_bmapi_read(ip
, XFS_BB_TO_FSBT(mp
, bmv
->bmv_offset
),
633 XFS_BB_TO_FSB(mp
, bmv
->bmv_length
),
634 map
, &nmap
, bmapi_flags
);
637 ASSERT(nmap
<= subnex
);
639 for (i
= 0; i
< nmap
&& nexleft
&& bmv
->bmv_length
; i
++) {
640 out
[cur_ext
].bmv_oflags
= 0;
641 if (map
[i
].br_state
== XFS_EXT_UNWRITTEN
)
642 out
[cur_ext
].bmv_oflags
|= BMV_OF_PREALLOC
;
643 else if (map
[i
].br_startblock
== DELAYSTARTBLOCK
)
644 out
[cur_ext
].bmv_oflags
|= BMV_OF_DELALLOC
;
645 out
[cur_ext
].bmv_offset
=
646 XFS_FSB_TO_BB(mp
, map
[i
].br_startoff
);
647 out
[cur_ext
].bmv_length
=
648 XFS_FSB_TO_BB(mp
, map
[i
].br_blockcount
);
649 out
[cur_ext
].bmv_unused1
= 0;
650 out
[cur_ext
].bmv_unused2
= 0;
653 * delayed allocation extents that start beyond EOF can
654 * occur due to speculative EOF allocation when the
655 * delalloc extent is larger than the largest freespace
656 * extent at conversion time. These extents cannot be
657 * converted by data writeback, so can exist here even
658 * if we are not supposed to be finding delalloc
661 if (map
[i
].br_startblock
== DELAYSTARTBLOCK
&&
662 map
[i
].br_startoff
<= XFS_B_TO_FSB(mp
, XFS_ISIZE(ip
)))
663 ASSERT((iflags
& BMV_IF_DELALLOC
) != 0);
665 if (map
[i
].br_startblock
== HOLESTARTBLOCK
&&
666 whichfork
== XFS_ATTR_FORK
) {
667 /* came to the end of attribute fork */
668 out
[cur_ext
].bmv_oflags
|= BMV_OF_LAST
;
672 if (!xfs_getbmapx_fix_eof_hole(ip
, &out
[cur_ext
],
674 map
[i
].br_startblock
))
678 out
[cur_ext
].bmv_offset
+
679 out
[cur_ext
].bmv_length
;
681 max_t(__int64_t
, 0, bmvend
- bmv
->bmv_offset
);
684 * In case we don't want to return the hole,
685 * don't increase cur_ext so that we can reuse
686 * it in the next loop.
688 if ((iflags
& BMV_IF_NO_HOLES
) &&
689 map
[i
].br_startblock
== HOLESTARTBLOCK
) {
690 memset(&out
[cur_ext
], 0, sizeof(out
[cur_ext
]));
698 } while (nmap
&& nexleft
&& bmv
->bmv_length
);
703 xfs_iunlock(ip
, lock
);
705 xfs_iunlock(ip
, XFS_IOLOCK_SHARED
);
707 for (i
= 0; i
< cur_ext
; i
++) {
708 int full
= 0; /* user array is full */
710 /* format results & advance arg */
711 error
= formatter(&arg
, &out
[i
], &full
);
721 * dead simple method of punching delalyed allocation blocks from a range in
722 * the inode. Walks a block at a time so will be slow, but is only executed in
723 * rare error cases so the overhead is not critical. This will always punch out
724 * both the start and end blocks, even if the ranges only partially overlap
725 * them, so it is up to the caller to ensure that partial blocks are not
729 xfs_bmap_punch_delalloc_range(
730 struct xfs_inode
*ip
,
731 xfs_fileoff_t start_fsb
,
732 xfs_fileoff_t length
)
734 xfs_fileoff_t remaining
= length
;
737 ASSERT(xfs_isilocked(ip
, XFS_ILOCK_EXCL
));
741 xfs_bmbt_irec_t imap
;
743 xfs_fsblock_t firstblock
;
744 xfs_bmap_free_t flist
;
747 * Map the range first and check that it is a delalloc extent
748 * before trying to unmap the range. Otherwise we will be
749 * trying to remove a real extent (which requires a
750 * transaction) or a hole, which is probably a bad idea...
752 error
= xfs_bmapi_read(ip
, start_fsb
, 1, &imap
, &nimaps
,
756 /* something screwed, just bail */
757 if (!XFS_FORCED_SHUTDOWN(ip
->i_mount
)) {
758 xfs_alert(ip
->i_mount
,
759 "Failed delalloc mapping lookup ino %lld fsb %lld.",
760 ip
->i_ino
, start_fsb
);
768 if (imap
.br_startblock
!= DELAYSTARTBLOCK
) {
769 /* been converted, ignore */
772 WARN_ON(imap
.br_blockcount
== 0);
775 * Note: while we initialise the firstblock/flist pair, they
776 * should never be used because blocks should never be
777 * allocated or freed for a delalloc extent and hence we need
778 * don't cancel or finish them after the xfs_bunmapi() call.
780 xfs_bmap_init(&flist
, &firstblock
);
781 error
= xfs_bunmapi(NULL
, ip
, start_fsb
, 1, 0, 1, &firstblock
,
786 ASSERT(!flist
.xbf_count
&& !flist
.xbf_first
);
790 } while(remaining
> 0);
796 * Test whether it is appropriate to check an inode for and free post EOF
797 * blocks. The 'force' parameter determines whether we should also consider
798 * regular files that are marked preallocated or append-only.
801 xfs_can_free_eofblocks(struct xfs_inode
*ip
, bool force
)
803 /* prealloc/delalloc exists only on regular files */
804 if (!S_ISREG(ip
->i_d
.di_mode
))
808 * Zero sized files with no cached pages and delalloc blocks will not
809 * have speculative prealloc/delalloc blocks to remove.
811 if (VFS_I(ip
)->i_size
== 0 &&
812 VFS_I(ip
)->i_mapping
->nrpages
== 0 &&
813 ip
->i_delayed_blks
== 0)
816 /* If we haven't read in the extent list, then don't do it now. */
817 if (!(ip
->i_df
.if_flags
& XFS_IFEXTENTS
))
821 * Do not free real preallocated or append-only files unless the file
822 * has delalloc blocks and we are forced to remove them.
824 if (ip
->i_d
.di_flags
& (XFS_DIFLAG_PREALLOC
| XFS_DIFLAG_APPEND
))
825 if (!force
|| ip
->i_delayed_blks
== 0)
832 * This is called by xfs_inactive to free any blocks beyond eof
833 * when the link count isn't zero and by xfs_dm_punch_hole() when
834 * punching a hole to EOF.
844 xfs_fileoff_t end_fsb
;
845 xfs_fileoff_t last_fsb
;
846 xfs_filblks_t map_len
;
848 xfs_bmbt_irec_t imap
;
851 * Figure out if there are any blocks beyond the end
852 * of the file. If not, then there is nothing to do.
854 end_fsb
= XFS_B_TO_FSB(mp
, (xfs_ufsize_t
)XFS_ISIZE(ip
));
855 last_fsb
= XFS_B_TO_FSB(mp
, mp
->m_super
->s_maxbytes
);
856 if (last_fsb
<= end_fsb
)
858 map_len
= last_fsb
- end_fsb
;
861 xfs_ilock(ip
, XFS_ILOCK_SHARED
);
862 error
= xfs_bmapi_read(ip
, end_fsb
, map_len
, &imap
, &nimaps
, 0);
863 xfs_iunlock(ip
, XFS_ILOCK_SHARED
);
865 if (!error
&& (nimaps
!= 0) &&
866 (imap
.br_startblock
!= HOLESTARTBLOCK
||
867 ip
->i_delayed_blks
)) {
869 * Attach the dquots to the inode up front.
871 error
= xfs_qm_dqattach(ip
, 0);
876 * There are blocks after the end of file.
877 * Free them up now by truncating the file to
880 tp
= xfs_trans_alloc(mp
, XFS_TRANS_INACTIVE
);
883 if (!xfs_ilock_nowait(ip
, XFS_IOLOCK_EXCL
)) {
884 xfs_trans_cancel(tp
, 0);
889 error
= xfs_trans_reserve(tp
, &M_RES(mp
)->tr_itruncate
, 0, 0);
891 ASSERT(XFS_FORCED_SHUTDOWN(mp
));
892 xfs_trans_cancel(tp
, 0);
894 xfs_iunlock(ip
, XFS_IOLOCK_EXCL
);
898 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
899 xfs_trans_ijoin(tp
, ip
, 0);
902 * Do not update the on-disk file size. If we update the
903 * on-disk file size and then the system crashes before the
904 * contents of the file are flushed to disk then the files
905 * may be full of holes (ie NULL files bug).
907 error
= xfs_itruncate_extents(&tp
, ip
, XFS_DATA_FORK
,
911 * If we get an error at this point we simply don't
912 * bother truncating the file.
915 (XFS_TRANS_RELEASE_LOG_RES
|
918 error
= xfs_trans_commit(tp
,
919 XFS_TRANS_RELEASE_LOG_RES
);
921 xfs_inode_clear_eofblocks_tag(ip
);
924 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
926 xfs_iunlock(ip
, XFS_IOLOCK_EXCL
);
932 xfs_alloc_file_space(
933 struct xfs_inode
*ip
,
938 xfs_mount_t
*mp
= ip
->i_mount
;
940 xfs_filblks_t allocated_fsb
;
941 xfs_filblks_t allocatesize_fsb
;
942 xfs_extlen_t extsz
, temp
;
943 xfs_fileoff_t startoffset_fsb
;
944 xfs_fsblock_t firstfsb
;
949 xfs_bmbt_irec_t imaps
[1], *imapp
;
950 xfs_bmap_free_t free_list
;
951 uint qblocks
, resblks
, resrtextents
;
955 trace_xfs_alloc_file_space(ip
);
957 if (XFS_FORCED_SHUTDOWN(mp
))
960 error
= xfs_qm_dqattach(ip
, 0);
967 rt
= XFS_IS_REALTIME_INODE(ip
);
968 extsz
= xfs_get_extsz_hint(ip
);
973 startoffset_fsb
= XFS_B_TO_FSBT(mp
, offset
);
974 allocatesize_fsb
= XFS_B_TO_FSB(mp
, count
);
977 * Allocate file space until done or until there is an error
979 while (allocatesize_fsb
&& !error
) {
983 * Determine space reservations for data/realtime.
985 if (unlikely(extsz
)) {
989 e
= startoffset_fsb
+ allocatesize_fsb
;
990 if ((temp
= do_mod(startoffset_fsb
, extsz
)))
992 if ((temp
= do_mod(e
, extsz
)))
996 e
= allocatesize_fsb
;
1000 * The transaction reservation is limited to a 32-bit block
1001 * count, hence we need to limit the number of blocks we are
1002 * trying to reserve to avoid an overflow. We can't allocate
1003 * more than @nimaps extents, and an extent is limited on disk
1004 * to MAXEXTLEN (21 bits), so use that to enforce the limit.
1006 resblks
= min_t(xfs_fileoff_t
, (e
- s
), (MAXEXTLEN
* nimaps
));
1008 resrtextents
= qblocks
= resblks
;
1009 resrtextents
/= mp
->m_sb
.sb_rextsize
;
1010 resblks
= XFS_DIOSTRAT_SPACE_RES(mp
, 0);
1011 quota_flag
= XFS_QMOPT_RES_RTBLKS
;
1014 resblks
= qblocks
= XFS_DIOSTRAT_SPACE_RES(mp
, resblks
);
1015 quota_flag
= XFS_QMOPT_RES_REGBLKS
;
1019 * Allocate and setup the transaction.
1021 tp
= xfs_trans_alloc(mp
, XFS_TRANS_DIOSTRAT
);
1022 error
= xfs_trans_reserve(tp
, &M_RES(mp
)->tr_write
,
1023 resblks
, resrtextents
);
1025 * Check for running out of space
1029 * Free the transaction structure.
1031 ASSERT(error
== -ENOSPC
|| XFS_FORCED_SHUTDOWN(mp
));
1032 xfs_trans_cancel(tp
, 0);
1035 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
1036 error
= xfs_trans_reserve_quota_nblks(tp
, ip
, qblocks
,
1041 xfs_trans_ijoin(tp
, ip
, 0);
1043 xfs_bmap_init(&free_list
, &firstfsb
);
1044 error
= xfs_bmapi_write(tp
, ip
, startoffset_fsb
,
1045 allocatesize_fsb
, alloc_type
, &firstfsb
,
1046 0, imapp
, &nimaps
, &free_list
);
1052 * Complete the transaction
1054 error
= xfs_bmap_finish(&tp
, &free_list
, &committed
);
1059 error
= xfs_trans_commit(tp
, XFS_TRANS_RELEASE_LOG_RES
);
1060 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
1065 allocated_fsb
= imapp
->br_blockcount
;
1072 startoffset_fsb
+= allocated_fsb
;
1073 allocatesize_fsb
-= allocated_fsb
;
1078 error0
: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */
1079 xfs_bmap_cancel(&free_list
);
1080 xfs_trans_unreserve_quota_nblks(tp
, ip
, (long)qblocks
, 0, quota_flag
);
1082 error1
: /* Just cancel transaction */
1083 xfs_trans_cancel(tp
, XFS_TRANS_RELEASE_LOG_RES
| XFS_TRANS_ABORT
);
1084 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
1089 * Zero file bytes between startoff and endoff inclusive.
1090 * The iolock is held exclusive and no blocks are buffered.
1092 * This function is used by xfs_free_file_space() to zero
1093 * partial blocks when the range to free is not block aligned.
1094 * When unreserving space with boundaries that are not block
1095 * aligned we round up the start and round down the end
1096 * boundaries and then use this function to zero the parts of
1097 * the blocks that got dropped during the rounding.
1100 xfs_zero_remaining_bytes(
1105 xfs_bmbt_irec_t imap
;
1106 xfs_fileoff_t offset_fsb
;
1107 xfs_off_t lastoffset
;
1110 xfs_mount_t
*mp
= ip
->i_mount
;
1115 * Avoid doing I/O beyond eof - it's not necessary
1116 * since nothing can read beyond eof. The space will
1117 * be zeroed when the file is extended anyway.
1119 if (startoff
>= XFS_ISIZE(ip
))
1122 if (endoff
> XFS_ISIZE(ip
))
1123 endoff
= XFS_ISIZE(ip
);
1125 bp
= xfs_buf_get_uncached(XFS_IS_REALTIME_INODE(ip
) ?
1126 mp
->m_rtdev_targp
: mp
->m_ddev_targp
,
1127 BTOBB(mp
->m_sb
.sb_blocksize
), 0);
1133 for (offset
= startoff
; offset
<= endoff
; offset
= lastoffset
+ 1) {
1136 offset_fsb
= XFS_B_TO_FSBT(mp
, offset
);
1139 lock_mode
= xfs_ilock_data_map_shared(ip
);
1140 error
= xfs_bmapi_read(ip
, offset_fsb
, 1, &imap
, &nimap
, 0);
1141 xfs_iunlock(ip
, lock_mode
);
1143 if (error
|| nimap
< 1)
1145 ASSERT(imap
.br_blockcount
>= 1);
1146 ASSERT(imap
.br_startoff
== offset_fsb
);
1147 lastoffset
= XFS_FSB_TO_B(mp
, imap
.br_startoff
+ 1) - 1;
1148 if (lastoffset
> endoff
)
1149 lastoffset
= endoff
;
1150 if (imap
.br_startblock
== HOLESTARTBLOCK
)
1152 ASSERT(imap
.br_startblock
!= DELAYSTARTBLOCK
);
1153 if (imap
.br_state
== XFS_EXT_UNWRITTEN
)
1156 XFS_BUF_UNWRITE(bp
);
1158 XFS_BUF_SET_ADDR(bp
, xfs_fsb_to_db(ip
, imap
.br_startblock
));
1160 if (XFS_FORCED_SHUTDOWN(mp
)) {
1164 xfs_buf_iorequest(bp
);
1165 error
= xfs_buf_iowait(bp
);
1167 xfs_buf_ioerror_alert(bp
,
1168 "xfs_zero_remaining_bytes(read)");
1172 (offset
- XFS_FSB_TO_B(mp
, imap
.br_startoff
)),
1173 0, lastoffset
- offset
+ 1);
1178 if (XFS_FORCED_SHUTDOWN(mp
)) {
1182 xfs_buf_iorequest(bp
);
1183 error
= xfs_buf_iowait(bp
);
1185 xfs_buf_ioerror_alert(bp
,
1186 "xfs_zero_remaining_bytes(write)");
1195 xfs_free_file_space(
1196 struct xfs_inode
*ip
,
1202 xfs_fileoff_t endoffset_fsb
;
1204 xfs_fsblock_t firstfsb
;
1205 xfs_bmap_free_t free_list
;
1206 xfs_bmbt_irec_t imap
;
1214 xfs_fileoff_t startoffset_fsb
;
1219 trace_xfs_free_file_space(ip
);
1221 error
= xfs_qm_dqattach(ip
, 0);
1226 if (len
<= 0) /* if nothing being freed */
1228 rt
= XFS_IS_REALTIME_INODE(ip
);
1229 startoffset_fsb
= XFS_B_TO_FSB(mp
, offset
);
1230 endoffset_fsb
= XFS_B_TO_FSBT(mp
, offset
+ len
);
1232 /* wait for the completion of any pending DIOs */
1233 inode_dio_wait(VFS_I(ip
));
1235 rounding
= max_t(xfs_off_t
, 1 << mp
->m_sb
.sb_blocklog
, PAGE_CACHE_SIZE
);
1236 ioffset
= offset
& ~(rounding
- 1);
1237 error
= filemap_write_and_wait_range(VFS_I(ip
)->i_mapping
,
1241 truncate_pagecache_range(VFS_I(ip
), ioffset
, -1);
1244 * Need to zero the stuff we're not freeing, on disk.
1245 * If it's a realtime file & can't use unwritten extents then we
1246 * actually need to zero the extent edges. Otherwise xfs_bunmapi
1247 * will take care of it for us.
1249 if (rt
&& !xfs_sb_version_hasextflgbit(&mp
->m_sb
)) {
1251 error
= xfs_bmapi_read(ip
, startoffset_fsb
, 1,
1255 ASSERT(nimap
== 0 || nimap
== 1);
1256 if (nimap
&& imap
.br_startblock
!= HOLESTARTBLOCK
) {
1259 ASSERT(imap
.br_startblock
!= DELAYSTARTBLOCK
);
1260 block
= imap
.br_startblock
;
1261 mod
= do_div(block
, mp
->m_sb
.sb_rextsize
);
1263 startoffset_fsb
+= mp
->m_sb
.sb_rextsize
- mod
;
1266 error
= xfs_bmapi_read(ip
, endoffset_fsb
- 1, 1,
1270 ASSERT(nimap
== 0 || nimap
== 1);
1271 if (nimap
&& imap
.br_startblock
!= HOLESTARTBLOCK
) {
1272 ASSERT(imap
.br_startblock
!= DELAYSTARTBLOCK
);
1274 if (mod
&& (mod
!= mp
->m_sb
.sb_rextsize
))
1275 endoffset_fsb
-= mod
;
1278 if ((done
= (endoffset_fsb
<= startoffset_fsb
)))
1280 * One contiguous piece to clear
1282 error
= xfs_zero_remaining_bytes(ip
, offset
, offset
+ len
- 1);
1285 * Some full blocks, possibly two pieces to clear
1287 if (offset
< XFS_FSB_TO_B(mp
, startoffset_fsb
))
1288 error
= xfs_zero_remaining_bytes(ip
, offset
,
1289 XFS_FSB_TO_B(mp
, startoffset_fsb
) - 1);
1291 XFS_FSB_TO_B(mp
, endoffset_fsb
) < offset
+ len
)
1292 error
= xfs_zero_remaining_bytes(ip
,
1293 XFS_FSB_TO_B(mp
, endoffset_fsb
),
1298 * free file space until done or until there is an error
1300 resblks
= XFS_DIOSTRAT_SPACE_RES(mp
, 0);
1301 while (!error
&& !done
) {
1304 * allocate and setup the transaction. Allow this
1305 * transaction to dip into the reserve blocks to ensure
1306 * the freeing of the space succeeds at ENOSPC.
1308 tp
= xfs_trans_alloc(mp
, XFS_TRANS_DIOSTRAT
);
1309 error
= xfs_trans_reserve(tp
, &M_RES(mp
)->tr_write
, resblks
, 0);
1312 * check for running out of space
1316 * Free the transaction structure.
1318 ASSERT(error
== -ENOSPC
|| XFS_FORCED_SHUTDOWN(mp
));
1319 xfs_trans_cancel(tp
, 0);
1322 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
1323 error
= xfs_trans_reserve_quota(tp
, mp
,
1324 ip
->i_udquot
, ip
->i_gdquot
, ip
->i_pdquot
,
1325 resblks
, 0, XFS_QMOPT_RES_REGBLKS
);
1329 xfs_trans_ijoin(tp
, ip
, 0);
1332 * issue the bunmapi() call to free the blocks
1334 xfs_bmap_init(&free_list
, &firstfsb
);
1335 error
= xfs_bunmapi(tp
, ip
, startoffset_fsb
,
1336 endoffset_fsb
- startoffset_fsb
,
1337 0, 2, &firstfsb
, &free_list
, &done
);
1343 * complete the transaction
1345 error
= xfs_bmap_finish(&tp
, &free_list
, &committed
);
1350 error
= xfs_trans_commit(tp
, XFS_TRANS_RELEASE_LOG_RES
);
1351 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
1358 xfs_bmap_cancel(&free_list
);
1360 xfs_trans_cancel(tp
, XFS_TRANS_RELEASE_LOG_RES
| XFS_TRANS_ABORT
);
1361 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
1367 xfs_zero_file_space(
1368 struct xfs_inode
*ip
,
1372 struct xfs_mount
*mp
= ip
->i_mount
;
1374 xfs_off_t start_boundary
;
1375 xfs_off_t end_boundary
;
1378 trace_xfs_zero_file_space(ip
);
1380 granularity
= max_t(uint
, 1 << mp
->m_sb
.sb_blocklog
, PAGE_CACHE_SIZE
);
1383 * Round the range of extents we are going to convert inwards. If the
1384 * offset is aligned, then it doesn't get changed so we zero from the
1385 * start of the block offset points to.
1387 start_boundary
= round_up(offset
, granularity
);
1388 end_boundary
= round_down(offset
+ len
, granularity
);
1390 ASSERT(start_boundary
>= offset
);
1391 ASSERT(end_boundary
<= offset
+ len
);
1393 if (start_boundary
< end_boundary
- 1) {
1395 * punch out delayed allocation blocks and the page cache over
1396 * the conversion range
1398 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
1399 error
= xfs_bmap_punch_delalloc_range(ip
,
1400 XFS_B_TO_FSBT(mp
, start_boundary
),
1401 XFS_B_TO_FSB(mp
, end_boundary
- start_boundary
));
1402 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
1403 truncate_pagecache_range(VFS_I(ip
), start_boundary
,
1406 /* convert the blocks */
1407 error
= xfs_alloc_file_space(ip
, start_boundary
,
1408 end_boundary
- start_boundary
- 1,
1409 XFS_BMAPI_PREALLOC
| XFS_BMAPI_CONVERT
);
1413 /* We've handled the interior of the range, now for the edges */
1414 if (start_boundary
!= offset
) {
1415 error
= xfs_iozero(ip
, offset
, start_boundary
- offset
);
1420 if (end_boundary
!= offset
+ len
)
1421 error
= xfs_iozero(ip
, end_boundary
,
1422 offset
+ len
- end_boundary
);
1426 * It's either a sub-granularity range or the range spanned lies
1427 * partially across two adjacent blocks.
1429 error
= xfs_iozero(ip
, offset
, len
);
1438 * xfs_collapse_file_space()
1439 * This routine frees disk space and shift extent for the given file.
1440 * The first thing we do is to free data blocks in the specified range
1441 * by calling xfs_free_file_space(). It would also sync dirty data
1442 * and invalidate page cache over the region on which collapse range
1443 * is working. And Shift extent records to the left to cover a hole.
1450 xfs_collapse_file_space(
1451 struct xfs_inode
*ip
,
1456 struct xfs_mount
*mp
= ip
->i_mount
;
1457 struct xfs_trans
*tp
;
1459 xfs_extnum_t current_ext
= 0;
1460 struct xfs_bmap_free free_list
;
1461 xfs_fsblock_t first_block
;
1463 xfs_fileoff_t start_fsb
;
1464 xfs_fileoff_t shift_fsb
;
1466 ASSERT(xfs_isilocked(ip
, XFS_IOLOCK_EXCL
));
1468 trace_xfs_collapse_file_space(ip
);
1470 start_fsb
= XFS_B_TO_FSB(mp
, offset
+ len
);
1471 shift_fsb
= XFS_B_TO_FSB(mp
, len
);
1473 error
= xfs_free_file_space(ip
, offset
, len
);
1477 while (!error
&& !done
) {
1478 tp
= xfs_trans_alloc(mp
, XFS_TRANS_DIOSTRAT
);
1480 * We would need to reserve permanent block for transaction.
1481 * This will come into picture when after shifting extent into
1482 * hole we found that adjacent extents can be merged which
1483 * may lead to freeing of a block during record update.
1485 error
= xfs_trans_reserve(tp
, &M_RES(mp
)->tr_write
,
1486 XFS_DIOSTRAT_SPACE_RES(mp
, 0), 0);
1488 xfs_trans_cancel(tp
, 0);
1492 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
1493 error
= xfs_trans_reserve_quota(tp
, mp
, ip
->i_udquot
,
1494 ip
->i_gdquot
, ip
->i_pdquot
,
1495 XFS_DIOSTRAT_SPACE_RES(mp
, 0), 0,
1496 XFS_QMOPT_RES_REGBLKS
);
1500 xfs_trans_ijoin(tp
, ip
, 0);
1502 xfs_bmap_init(&free_list
, &first_block
);
1505 * We are using the write transaction in which max 2 bmbt
1506 * updates are allowed
1508 error
= xfs_bmap_shift_extents(tp
, ip
, &done
, start_fsb
,
1509 shift_fsb
, ¤t_ext
,
1510 &first_block
, &free_list
,
1511 XFS_BMAP_MAX_SHIFT_EXTENTS
);
1515 error
= xfs_bmap_finish(&tp
, &free_list
, &committed
);
1519 error
= xfs_trans_commit(tp
, XFS_TRANS_RELEASE_LOG_RES
);
1520 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
1526 xfs_trans_cancel(tp
, XFS_TRANS_RELEASE_LOG_RES
| XFS_TRANS_ABORT
);
1527 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
1532 * We need to check that the format of the data fork in the temporary inode is
1533 * valid for the target inode before doing the swap. This is not a problem with
1534 * attr1 because of the fixed fork offset, but attr2 has a dynamically sized
1535 * data fork depending on the space the attribute fork is taking so we can get
1536 * invalid formats on the target inode.
1538 * E.g. target has space for 7 extents in extent format, temp inode only has
1539 * space for 6. If we defragment down to 7 extents, then the tmp format is a
1540 * btree, but when swapped it needs to be in extent format. Hence we can't just
1541 * blindly swap data forks on attr2 filesystems.
1543 * Note that we check the swap in both directions so that we don't end up with
1544 * a corrupt temporary inode, either.
1546 * Note that fixing the way xfs_fsr sets up the attribute fork in the source
1547 * inode will prevent this situation from occurring, so all we do here is
1548 * reject and log the attempt. basically we are putting the responsibility on
1549 * userspace to get this right.
1552 xfs_swap_extents_check_format(
1553 xfs_inode_t
*ip
, /* target inode */
1554 xfs_inode_t
*tip
) /* tmp inode */
1557 /* Should never get a local format */
1558 if (ip
->i_d
.di_format
== XFS_DINODE_FMT_LOCAL
||
1559 tip
->i_d
.di_format
== XFS_DINODE_FMT_LOCAL
)
1563 * if the target inode has less extents that then temporary inode then
1564 * why did userspace call us?
1566 if (ip
->i_d
.di_nextents
< tip
->i_d
.di_nextents
)
1570 * if the target inode is in extent form and the temp inode is in btree
1571 * form then we will end up with the target inode in the wrong format
1572 * as we already know there are less extents in the temp inode.
1574 if (ip
->i_d
.di_format
== XFS_DINODE_FMT_EXTENTS
&&
1575 tip
->i_d
.di_format
== XFS_DINODE_FMT_BTREE
)
1578 /* Check temp in extent form to max in target */
1579 if (tip
->i_d
.di_format
== XFS_DINODE_FMT_EXTENTS
&&
1580 XFS_IFORK_NEXTENTS(tip
, XFS_DATA_FORK
) >
1581 XFS_IFORK_MAXEXT(ip
, XFS_DATA_FORK
))
1584 /* Check target in extent form to max in temp */
1585 if (ip
->i_d
.di_format
== XFS_DINODE_FMT_EXTENTS
&&
1586 XFS_IFORK_NEXTENTS(ip
, XFS_DATA_FORK
) >
1587 XFS_IFORK_MAXEXT(tip
, XFS_DATA_FORK
))
1591 * If we are in a btree format, check that the temp root block will fit
1592 * in the target and that it has enough extents to be in btree format
1595 * Note that we have to be careful to allow btree->extent conversions
1596 * (a common defrag case) which will occur when the temp inode is in
1599 if (tip
->i_d
.di_format
== XFS_DINODE_FMT_BTREE
) {
1600 if (XFS_IFORK_BOFF(ip
) &&
1601 XFS_BMAP_BMDR_SPACE(tip
->i_df
.if_broot
) > XFS_IFORK_BOFF(ip
))
1603 if (XFS_IFORK_NEXTENTS(tip
, XFS_DATA_FORK
) <=
1604 XFS_IFORK_MAXEXT(ip
, XFS_DATA_FORK
))
1608 /* Reciprocal target->temp btree format checks */
1609 if (ip
->i_d
.di_format
== XFS_DINODE_FMT_BTREE
) {
1610 if (XFS_IFORK_BOFF(tip
) &&
1611 XFS_BMAP_BMDR_SPACE(ip
->i_df
.if_broot
) > XFS_IFORK_BOFF(tip
))
1613 if (XFS_IFORK_NEXTENTS(ip
, XFS_DATA_FORK
) <=
1614 XFS_IFORK_MAXEXT(tip
, XFS_DATA_FORK
))
1622 xfs_swap_extent_flush(
1623 struct xfs_inode
*ip
)
1627 error
= filemap_write_and_wait(VFS_I(ip
)->i_mapping
);
1630 truncate_pagecache_range(VFS_I(ip
), 0, -1);
1632 /* Verify O_DIRECT for ftmp */
1633 if (VFS_I(ip
)->i_mapping
->nrpages
)
1637 * Don't try to swap extents on mmap()d files because we can't lock
1638 * out races against page faults safely.
1640 if (mapping_mapped(VFS_I(ip
)->i_mapping
))
1647 xfs_inode_t
*ip
, /* target inode */
1648 xfs_inode_t
*tip
, /* tmp inode */
1651 xfs_mount_t
*mp
= ip
->i_mount
;
1653 xfs_bstat_t
*sbp
= &sxp
->sx_stat
;
1654 xfs_ifork_t
*tempifp
, *ifp
, *tifp
;
1655 int src_log_flags
, target_log_flags
;
1662 tempifp
= kmem_alloc(sizeof(xfs_ifork_t
), KM_MAYFAIL
);
1669 * Lock up the inodes against other IO and truncate to begin with.
1670 * Then we can ensure the inodes are flushed and have no page cache
1671 * safely. Once we have done this we can take the ilocks and do the rest
1674 lock_flags
= XFS_IOLOCK_EXCL
;
1675 xfs_lock_two_inodes(ip
, tip
, XFS_IOLOCK_EXCL
);
1677 /* Verify that both files have the same format */
1678 if ((ip
->i_d
.di_mode
& S_IFMT
) != (tip
->i_d
.di_mode
& S_IFMT
)) {
1683 /* Verify both files are either real-time or non-realtime */
1684 if (XFS_IS_REALTIME_INODE(ip
) != XFS_IS_REALTIME_INODE(tip
)) {
1689 error
= xfs_swap_extent_flush(ip
);
1692 error
= xfs_swap_extent_flush(tip
);
1696 tp
= xfs_trans_alloc(mp
, XFS_TRANS_SWAPEXT
);
1697 error
= xfs_trans_reserve(tp
, &M_RES(mp
)->tr_ichange
, 0, 0);
1699 xfs_trans_cancel(tp
, 0);
1702 xfs_lock_two_inodes(ip
, tip
, XFS_ILOCK_EXCL
);
1703 lock_flags
|= XFS_ILOCK_EXCL
;
1705 /* Verify all data are being swapped */
1706 if (sxp
->sx_offset
!= 0 ||
1707 sxp
->sx_length
!= ip
->i_d
.di_size
||
1708 sxp
->sx_length
!= tip
->i_d
.di_size
) {
1710 goto out_trans_cancel
;
1713 trace_xfs_swap_extent_before(ip
, 0);
1714 trace_xfs_swap_extent_before(tip
, 1);
1716 /* check inode formats now that data is flushed */
1717 error
= xfs_swap_extents_check_format(ip
, tip
);
1720 "%s: inode 0x%llx format is incompatible for exchanging.",
1721 __func__
, ip
->i_ino
);
1722 goto out_trans_cancel
;
1726 * Compare the current change & modify times with that
1727 * passed in. If they differ, we abort this swap.
1728 * This is the mechanism used to ensure the calling
1729 * process that the file was not changed out from
1732 if ((sbp
->bs_ctime
.tv_sec
!= VFS_I(ip
)->i_ctime
.tv_sec
) ||
1733 (sbp
->bs_ctime
.tv_nsec
!= VFS_I(ip
)->i_ctime
.tv_nsec
) ||
1734 (sbp
->bs_mtime
.tv_sec
!= VFS_I(ip
)->i_mtime
.tv_sec
) ||
1735 (sbp
->bs_mtime
.tv_nsec
!= VFS_I(ip
)->i_mtime
.tv_nsec
)) {
1737 goto out_trans_cancel
;
1740 * Count the number of extended attribute blocks
1742 if ( ((XFS_IFORK_Q(ip
) != 0) && (ip
->i_d
.di_anextents
> 0)) &&
1743 (ip
->i_d
.di_aformat
!= XFS_DINODE_FMT_LOCAL
)) {
1744 error
= xfs_bmap_count_blocks(tp
, ip
, XFS_ATTR_FORK
, &aforkblks
);
1746 goto out_trans_cancel
;
1748 if ( ((XFS_IFORK_Q(tip
) != 0) && (tip
->i_d
.di_anextents
> 0)) &&
1749 (tip
->i_d
.di_aformat
!= XFS_DINODE_FMT_LOCAL
)) {
1750 error
= xfs_bmap_count_blocks(tp
, tip
, XFS_ATTR_FORK
,
1753 goto out_trans_cancel
;
1756 xfs_trans_ijoin(tp
, ip
, lock_flags
);
1757 xfs_trans_ijoin(tp
, tip
, lock_flags
);
1760 * Before we've swapped the forks, lets set the owners of the forks
1761 * appropriately. We have to do this as we are demand paging the btree
1762 * buffers, and so the validation done on read will expect the owner
1763 * field to be correctly set. Once we change the owners, we can swap the
1766 * Note the trickiness in setting the log flags - we set the owner log
1767 * flag on the opposite inode (i.e. the inode we are setting the new
1768 * owner to be) because once we swap the forks and log that, log
1769 * recovery is going to see the fork as owned by the swapped inode,
1770 * not the pre-swapped inodes.
1772 src_log_flags
= XFS_ILOG_CORE
;
1773 target_log_flags
= XFS_ILOG_CORE
;
1774 if (ip
->i_d
.di_version
== 3 &&
1775 ip
->i_d
.di_format
== XFS_DINODE_FMT_BTREE
) {
1776 target_log_flags
|= XFS_ILOG_DOWNER
;
1777 error
= xfs_bmbt_change_owner(tp
, ip
, XFS_DATA_FORK
,
1780 goto out_trans_cancel
;
1783 if (tip
->i_d
.di_version
== 3 &&
1784 tip
->i_d
.di_format
== XFS_DINODE_FMT_BTREE
) {
1785 src_log_flags
|= XFS_ILOG_DOWNER
;
1786 error
= xfs_bmbt_change_owner(tp
, tip
, XFS_DATA_FORK
,
1789 goto out_trans_cancel
;
1793 * Swap the data forks of the inodes
1797 *tempifp
= *ifp
; /* struct copy */
1798 *ifp
= *tifp
; /* struct copy */
1799 *tifp
= *tempifp
; /* struct copy */
1802 * Fix the on-disk inode values
1804 tmp
= (__uint64_t
)ip
->i_d
.di_nblocks
;
1805 ip
->i_d
.di_nblocks
= tip
->i_d
.di_nblocks
- taforkblks
+ aforkblks
;
1806 tip
->i_d
.di_nblocks
= tmp
+ taforkblks
- aforkblks
;
1808 tmp
= (__uint64_t
) ip
->i_d
.di_nextents
;
1809 ip
->i_d
.di_nextents
= tip
->i_d
.di_nextents
;
1810 tip
->i_d
.di_nextents
= tmp
;
1812 tmp
= (__uint64_t
) ip
->i_d
.di_format
;
1813 ip
->i_d
.di_format
= tip
->i_d
.di_format
;
1814 tip
->i_d
.di_format
= tmp
;
1817 * The extents in the source inode could still contain speculative
1818 * preallocation beyond EOF (e.g. the file is open but not modified
1819 * while defrag is in progress). In that case, we need to copy over the
1820 * number of delalloc blocks the data fork in the source inode is
1821 * tracking beyond EOF so that when the fork is truncated away when the
1822 * temporary inode is unlinked we don't underrun the i_delayed_blks
1823 * counter on that inode.
1825 ASSERT(tip
->i_delayed_blks
== 0);
1826 tip
->i_delayed_blks
= ip
->i_delayed_blks
;
1827 ip
->i_delayed_blks
= 0;
1829 switch (ip
->i_d
.di_format
) {
1830 case XFS_DINODE_FMT_EXTENTS
:
1831 /* If the extents fit in the inode, fix the
1832 * pointer. Otherwise it's already NULL or
1833 * pointing to the extent.
1835 if (ip
->i_d
.di_nextents
<= XFS_INLINE_EXTS
) {
1836 ifp
->if_u1
.if_extents
=
1837 ifp
->if_u2
.if_inline_ext
;
1839 src_log_flags
|= XFS_ILOG_DEXT
;
1841 case XFS_DINODE_FMT_BTREE
:
1842 ASSERT(ip
->i_d
.di_version
< 3 ||
1843 (src_log_flags
& XFS_ILOG_DOWNER
));
1844 src_log_flags
|= XFS_ILOG_DBROOT
;
1848 switch (tip
->i_d
.di_format
) {
1849 case XFS_DINODE_FMT_EXTENTS
:
1850 /* If the extents fit in the inode, fix the
1851 * pointer. Otherwise it's already NULL or
1852 * pointing to the extent.
1854 if (tip
->i_d
.di_nextents
<= XFS_INLINE_EXTS
) {
1855 tifp
->if_u1
.if_extents
=
1856 tifp
->if_u2
.if_inline_ext
;
1858 target_log_flags
|= XFS_ILOG_DEXT
;
1860 case XFS_DINODE_FMT_BTREE
:
1861 target_log_flags
|= XFS_ILOG_DBROOT
;
1862 ASSERT(tip
->i_d
.di_version
< 3 ||
1863 (target_log_flags
& XFS_ILOG_DOWNER
));
1867 xfs_trans_log_inode(tp
, ip
, src_log_flags
);
1868 xfs_trans_log_inode(tp
, tip
, target_log_flags
);
1871 * If this is a synchronous mount, make sure that the
1872 * transaction goes to disk before returning to the user.
1874 if (mp
->m_flags
& XFS_MOUNT_WSYNC
)
1875 xfs_trans_set_sync(tp
);
1877 error
= xfs_trans_commit(tp
, 0);
1879 trace_xfs_swap_extent_after(ip
, 0);
1880 trace_xfs_swap_extent_after(tip
, 1);
1886 xfs_iunlock(ip
, lock_flags
);
1887 xfs_iunlock(tip
, lock_flags
);
1891 xfs_trans_cancel(tp
, 0);