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"
26 #include "xfs_mount.h"
27 #include "xfs_da_format.h"
28 #include "xfs_inode.h"
29 #include "xfs_btree.h"
30 #include "xfs_trans.h"
31 #include "xfs_extfree_item.h"
32 #include "xfs_alloc.h"
34 #include "xfs_bmap_util.h"
35 #include "xfs_bmap_btree.h"
36 #include "xfs_rtalloc.h"
37 #include "xfs_error.h"
38 #include "xfs_quota.h"
39 #include "xfs_trans_space.h"
40 #include "xfs_trace.h"
41 #include "xfs_icache.h"
44 /* Kernel only BMAP related definitions and functions */
47 * Convert the given file system block to a disk block. We have to treat it
48 * differently based on whether the file is a real time file or not, because the
52 xfs_fsb_to_db(struct xfs_inode
*ip
, xfs_fsblock_t fsb
)
54 return (XFS_IS_REALTIME_INODE(ip
) ? \
55 (xfs_daddr_t
)XFS_FSB_TO_BB((ip
)->i_mount
, (fsb
)) : \
56 XFS_FSB_TO_DADDR((ip
)->i_mount
, (fsb
)));
60 * Routine to zero an extent on disk allocated to the specific inode.
62 * The VFS functions take a linearised filesystem block offset, so we have to
63 * convert the sparse xfs fsb to the right format first.
64 * VFS types are real funky, too.
69 xfs_fsblock_t start_fsb
,
72 struct xfs_mount
*mp
= ip
->i_mount
;
73 xfs_daddr_t sector
= xfs_fsb_to_db(ip
, start_fsb
);
74 sector_t block
= XFS_BB_TO_FSBT(mp
, sector
);
75 ssize_t size
= XFS_FSB_TO_B(mp
, count_fsb
);
77 if (IS_DAX(VFS_I(ip
)))
78 return dax_clear_sectors(xfs_find_bdev_for_inode(VFS_I(ip
)),
82 * let the block layer decide on the fastest method of
83 * implementing the zeroing.
85 return sb_issue_zeroout(mp
->m_super
, block
, count_fsb
, GFP_NOFS
);
90 * Routine to be called at transaction's end by xfs_bmapi, xfs_bunmapi
91 * caller. Frees all the extents that need freeing, which must be done
92 * last due to locking considerations. We never free any extents in
93 * the first transaction.
95 * If an inode *ip is provided, rejoin it to the transaction if
96 * the transaction was committed.
100 struct xfs_trans
**tp
, /* transaction pointer addr */
101 struct xfs_bmap_free
*flist
, /* i/o: list extents to free */
102 struct xfs_inode
*ip
)
104 struct xfs_efd_log_item
*efd
; /* extent free data */
105 struct xfs_efi_log_item
*efi
; /* extent free intention */
106 int error
; /* error return value */
107 int committed
;/* xact committed or not */
108 struct xfs_bmap_free_item
*free
; /* free extent item */
109 struct xfs_bmap_free_item
*next
; /* next item on free list */
111 ASSERT((*tp
)->t_flags
& XFS_TRANS_PERM_LOG_RES
);
112 if (flist
->xbf_count
== 0)
115 efi
= xfs_trans_get_efi(*tp
, flist
->xbf_count
);
116 for (free
= flist
->xbf_first
; free
; free
= free
->xbfi_next
)
117 xfs_trans_log_efi_extent(*tp
, efi
, free
->xbfi_startblock
,
118 free
->xbfi_blockcount
);
120 error
= __xfs_trans_roll(tp
, ip
, &committed
);
123 * If the transaction was committed, drop the EFD reference
124 * since we're bailing out of here. The other reference is
125 * dropped when the EFI hits the AIL.
127 * If the transaction was not committed, the EFI is freed by the
128 * EFI item unlock handler on abort. Also, we have a new
129 * transaction so we should return committed=1 even though we're
130 * returning an error.
133 xfs_efi_release(efi
);
134 xfs_force_shutdown((*tp
)->t_mountp
,
135 (error
== -EFSCORRUPTED
) ?
136 SHUTDOWN_CORRUPT_INCORE
:
137 SHUTDOWN_META_IO_ERROR
);
143 * Get an EFD and free each extent in the list, logging to the EFD in
144 * the process. The remaining bmap free list is cleaned up by the caller
147 efd
= xfs_trans_get_efd(*tp
, efi
, flist
->xbf_count
);
148 for (free
= flist
->xbf_first
; free
!= NULL
; free
= next
) {
149 next
= free
->xbfi_next
;
151 error
= xfs_trans_free_extent(*tp
, efd
, free
->xbfi_startblock
,
152 free
->xbfi_blockcount
);
156 xfs_bmap_del_free(flist
, NULL
, free
);
164 struct xfs_bmalloca
*ap
) /* bmap alloc argument struct */
166 xfs_alloctype_t atype
= 0; /* type for allocation routines */
167 int error
; /* error return value */
168 xfs_mount_t
*mp
; /* mount point structure */
169 xfs_extlen_t prod
= 0; /* product factor for allocators */
170 xfs_extlen_t ralen
= 0; /* realtime allocation length */
171 xfs_extlen_t align
; /* minimum allocation alignment */
174 mp
= ap
->ip
->i_mount
;
175 align
= xfs_get_extsz_hint(ap
->ip
);
176 prod
= align
/ mp
->m_sb
.sb_rextsize
;
177 error
= xfs_bmap_extsize_align(mp
, &ap
->got
, &ap
->prev
,
178 align
, 1, ap
->eof
, 0,
179 ap
->conv
, &ap
->offset
, &ap
->length
);
183 ASSERT(ap
->length
% mp
->m_sb
.sb_rextsize
== 0);
186 * If the offset & length are not perfectly aligned
187 * then kill prod, it will just get us in trouble.
189 if (do_mod(ap
->offset
, align
) || ap
->length
% align
)
192 * Set ralen to be the actual requested length in rtextents.
194 ralen
= ap
->length
/ mp
->m_sb
.sb_rextsize
;
196 * If the old value was close enough to MAXEXTLEN that
197 * we rounded up to it, cut it back so it's valid again.
198 * Note that if it's a really large request (bigger than
199 * MAXEXTLEN), we don't hear about that number, and can't
200 * adjust the starting point to match it.
202 if (ralen
* mp
->m_sb
.sb_rextsize
>= MAXEXTLEN
)
203 ralen
= MAXEXTLEN
/ mp
->m_sb
.sb_rextsize
;
206 * Lock out other modifications to the RT bitmap inode.
208 xfs_ilock(mp
->m_rbmip
, XFS_ILOCK_EXCL
);
209 xfs_trans_ijoin(ap
->tp
, mp
->m_rbmip
, XFS_ILOCK_EXCL
);
212 * If it's an allocation to an empty file at offset 0,
213 * pick an extent that will space things out in the rt area.
215 if (ap
->eof
&& ap
->offset
== 0) {
216 xfs_rtblock_t
uninitialized_var(rtx
); /* realtime extent no */
218 error
= xfs_rtpick_extent(mp
, ap
->tp
, ralen
, &rtx
);
221 ap
->blkno
= rtx
* mp
->m_sb
.sb_rextsize
;
226 xfs_bmap_adjacent(ap
);
229 * Realtime allocation, done through xfs_rtallocate_extent.
231 atype
= ap
->blkno
== 0 ? XFS_ALLOCTYPE_ANY_AG
: XFS_ALLOCTYPE_NEAR_BNO
;
232 do_div(ap
->blkno
, mp
->m_sb
.sb_rextsize
);
235 if ((error
= xfs_rtallocate_extent(ap
->tp
, ap
->blkno
, 1, ap
->length
,
236 &ralen
, atype
, ap
->wasdel
, prod
, &rtb
)))
238 if (rtb
== NULLFSBLOCK
&& prod
> 1 &&
239 (error
= xfs_rtallocate_extent(ap
->tp
, ap
->blkno
, 1,
240 ap
->length
, &ralen
, atype
,
241 ap
->wasdel
, 1, &rtb
)))
244 if (ap
->blkno
!= NULLFSBLOCK
) {
245 ap
->blkno
*= mp
->m_sb
.sb_rextsize
;
246 ralen
*= mp
->m_sb
.sb_rextsize
;
248 ap
->ip
->i_d
.di_nblocks
+= ralen
;
249 xfs_trans_log_inode(ap
->tp
, ap
->ip
, XFS_ILOG_CORE
);
251 ap
->ip
->i_delayed_blks
-= ralen
;
253 * Adjust the disk quota also. This was reserved
256 xfs_trans_mod_dquot_byino(ap
->tp
, ap
->ip
,
257 ap
->wasdel
? XFS_TRANS_DQ_DELRTBCOUNT
:
258 XFS_TRANS_DQ_RTBCOUNT
, (long) ralen
);
260 /* Zero the extent if we were asked to do so */
261 if (ap
->userdata
& XFS_ALLOC_USERDATA_ZERO
) {
262 error
= xfs_zero_extent(ap
->ip
, ap
->blkno
, ap
->length
);
273 * Check if the endoff is outside the last extent. If so the caller will grow
274 * the allocation to a stripe unit boundary. All offsets are considered outside
275 * the end of file for an empty fork, so 1 is returned in *eof in that case.
279 struct xfs_inode
*ip
,
280 xfs_fileoff_t endoff
,
284 struct xfs_bmbt_irec rec
;
287 error
= xfs_bmap_last_extent(NULL
, ip
, whichfork
, &rec
, eof
);
291 *eof
= endoff
>= rec
.br_startoff
+ rec
.br_blockcount
;
296 * Extent tree block counting routines.
300 * Count leaf blocks given a range of extent records.
303 xfs_bmap_count_leaves(
311 for (b
= 0; b
< numrecs
; b
++) {
312 xfs_bmbt_rec_host_t
*frp
= xfs_iext_get_ext(ifp
, idx
+ b
);
313 *count
+= xfs_bmbt_get_blockcount(frp
);
318 * Count leaf blocks given a range of extent records originally
322 xfs_bmap_disk_count_leaves(
323 struct xfs_mount
*mp
,
324 struct xfs_btree_block
*block
,
331 for (b
= 1; b
<= numrecs
; b
++) {
332 frp
= XFS_BMBT_REC_ADDR(mp
, block
, b
);
333 *count
+= xfs_bmbt_disk_get_blockcount(frp
);
338 * Recursively walks each level of a btree
339 * to count total fsblocks in use.
341 STATIC
int /* error */
343 xfs_mount_t
*mp
, /* file system mount point */
344 xfs_trans_t
*tp
, /* transaction pointer */
345 xfs_ifork_t
*ifp
, /* inode fork pointer */
346 xfs_fsblock_t blockno
, /* file system block number */
347 int levelin
, /* level in btree */
348 int *count
) /* Count of blocks */
354 xfs_fsblock_t bno
= blockno
;
355 xfs_fsblock_t nextbno
;
356 struct xfs_btree_block
*block
, *nextblock
;
359 error
= xfs_btree_read_bufl(mp
, tp
, bno
, 0, &bp
, XFS_BMAP_BTREE_REF
,
364 block
= XFS_BUF_TO_BLOCK(bp
);
367 /* Not at node above leaves, count this level of nodes */
368 nextbno
= be64_to_cpu(block
->bb_u
.l
.bb_rightsib
);
369 while (nextbno
!= NULLFSBLOCK
) {
370 error
= xfs_btree_read_bufl(mp
, tp
, nextbno
, 0, &nbp
,
376 nextblock
= XFS_BUF_TO_BLOCK(nbp
);
377 nextbno
= be64_to_cpu(nextblock
->bb_u
.l
.bb_rightsib
);
378 xfs_trans_brelse(tp
, nbp
);
381 /* Dive to the next level */
382 pp
= XFS_BMBT_PTR_ADDR(mp
, block
, 1, mp
->m_bmap_dmxr
[1]);
383 bno
= be64_to_cpu(*pp
);
384 if (unlikely((error
=
385 xfs_bmap_count_tree(mp
, tp
, ifp
, bno
, level
, count
)) < 0)) {
386 xfs_trans_brelse(tp
, bp
);
387 XFS_ERROR_REPORT("xfs_bmap_count_tree(1)",
388 XFS_ERRLEVEL_LOW
, mp
);
389 return -EFSCORRUPTED
;
391 xfs_trans_brelse(tp
, bp
);
393 /* count all level 1 nodes and their leaves */
395 nextbno
= be64_to_cpu(block
->bb_u
.l
.bb_rightsib
);
396 numrecs
= be16_to_cpu(block
->bb_numrecs
);
397 xfs_bmap_disk_count_leaves(mp
, block
, numrecs
, count
);
398 xfs_trans_brelse(tp
, bp
);
399 if (nextbno
== NULLFSBLOCK
)
402 error
= xfs_btree_read_bufl(mp
, tp
, bno
, 0, &bp
,
408 block
= XFS_BUF_TO_BLOCK(bp
);
415 * Count fsblocks of the given fork.
418 xfs_bmap_count_blocks(
419 xfs_trans_t
*tp
, /* transaction pointer */
420 xfs_inode_t
*ip
, /* incore inode */
421 int whichfork
, /* data or attr fork */
422 int *count
) /* out: count of blocks */
424 struct xfs_btree_block
*block
; /* current btree block */
425 xfs_fsblock_t bno
; /* block # of "block" */
426 xfs_ifork_t
*ifp
; /* fork structure */
427 int level
; /* btree level, for checking */
428 xfs_mount_t
*mp
; /* file system mount structure */
429 __be64
*pp
; /* pointer to block address */
433 ifp
= XFS_IFORK_PTR(ip
, whichfork
);
434 if ( XFS_IFORK_FORMAT(ip
, whichfork
) == XFS_DINODE_FMT_EXTENTS
) {
435 xfs_bmap_count_leaves(ifp
, 0,
436 ifp
->if_bytes
/ (uint
)sizeof(xfs_bmbt_rec_t
),
442 * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
444 block
= ifp
->if_broot
;
445 level
= be16_to_cpu(block
->bb_level
);
447 pp
= XFS_BMAP_BROOT_PTR_ADDR(mp
, block
, 1, ifp
->if_broot_bytes
);
448 bno
= be64_to_cpu(*pp
);
449 ASSERT(bno
!= NULLFSBLOCK
);
450 ASSERT(XFS_FSB_TO_AGNO(mp
, bno
) < mp
->m_sb
.sb_agcount
);
451 ASSERT(XFS_FSB_TO_AGBNO(mp
, bno
) < mp
->m_sb
.sb_agblocks
);
453 if (unlikely(xfs_bmap_count_tree(mp
, tp
, ifp
, bno
, level
, count
) < 0)) {
454 XFS_ERROR_REPORT("xfs_bmap_count_blocks(2)", XFS_ERRLEVEL_LOW
,
456 return -EFSCORRUPTED
;
463 * returns 1 for success, 0 if we failed to map the extent.
466 xfs_getbmapx_fix_eof_hole(
467 xfs_inode_t
*ip
, /* xfs incore inode pointer */
468 struct getbmapx
*out
, /* output structure */
469 int prealloced
, /* this is a file with
470 * preallocated data space */
471 __int64_t end
, /* last block requested */
472 xfs_fsblock_t startblock
)
475 xfs_mount_t
*mp
; /* file system mount point */
476 xfs_ifork_t
*ifp
; /* inode fork pointer */
477 xfs_extnum_t lastx
; /* last extent pointer */
478 xfs_fileoff_t fileblock
;
480 if (startblock
== HOLESTARTBLOCK
) {
483 fixlen
= XFS_FSB_TO_BB(mp
, XFS_B_TO_FSB(mp
, XFS_ISIZE(ip
)));
484 fixlen
-= out
->bmv_offset
;
485 if (prealloced
&& out
->bmv_offset
+ out
->bmv_length
== end
) {
486 /* Came to hole at EOF. Trim it. */
489 out
->bmv_length
= fixlen
;
492 if (startblock
== DELAYSTARTBLOCK
)
495 out
->bmv_block
= xfs_fsb_to_db(ip
, startblock
);
496 fileblock
= XFS_BB_TO_FSB(ip
->i_mount
, out
->bmv_offset
);
497 ifp
= XFS_IFORK_PTR(ip
, XFS_DATA_FORK
);
498 if (xfs_iext_bno_to_ext(ifp
, fileblock
, &lastx
) &&
499 (lastx
== (ifp
->if_bytes
/ (uint
)sizeof(xfs_bmbt_rec_t
))-1))
500 out
->bmv_oflags
|= BMV_OF_LAST
;
507 * Get inode's extents as described in bmv, and format for output.
508 * Calls formatter to fill the user's buffer until all extents
509 * are mapped, until the passed-in bmv->bmv_count slots have
510 * been filled, or until the formatter short-circuits the loop,
511 * if it is tracking filled-in extents on its own.
516 struct getbmapx
*bmv
, /* user bmap structure */
517 xfs_bmap_format_t formatter
, /* format to user */
518 void *arg
) /* formatter arg */
520 __int64_t bmvend
; /* last block requested */
521 int error
= 0; /* return value */
522 __int64_t fixlen
; /* length for -1 case */
523 int i
; /* extent number */
524 int lock
; /* lock state */
525 xfs_bmbt_irec_t
*map
; /* buffer for user's data */
526 xfs_mount_t
*mp
; /* file system mount point */
527 int nex
; /* # of user extents can do */
528 int nexleft
; /* # of user extents left */
529 int subnex
; /* # of bmapi's can do */
530 int nmap
; /* number of map entries */
531 struct getbmapx
*out
; /* output structure */
532 int whichfork
; /* data or attr fork */
533 int prealloced
; /* this is a file with
534 * preallocated data space */
535 int iflags
; /* interface flags */
536 int bmapi_flags
; /* flags for xfs_bmapi */
540 iflags
= bmv
->bmv_iflags
;
541 whichfork
= iflags
& BMV_IF_ATTRFORK
? XFS_ATTR_FORK
: XFS_DATA_FORK
;
543 if (whichfork
== XFS_ATTR_FORK
) {
544 if (XFS_IFORK_Q(ip
)) {
545 if (ip
->i_d
.di_aformat
!= XFS_DINODE_FMT_EXTENTS
&&
546 ip
->i_d
.di_aformat
!= XFS_DINODE_FMT_BTREE
&&
547 ip
->i_d
.di_aformat
!= XFS_DINODE_FMT_LOCAL
)
550 ip
->i_d
.di_aformat
!= 0 &&
551 ip
->i_d
.di_aformat
!= XFS_DINODE_FMT_EXTENTS
)) {
552 XFS_ERROR_REPORT("xfs_getbmap", XFS_ERRLEVEL_LOW
,
554 return -EFSCORRUPTED
;
560 if (ip
->i_d
.di_format
!= XFS_DINODE_FMT_EXTENTS
&&
561 ip
->i_d
.di_format
!= XFS_DINODE_FMT_BTREE
&&
562 ip
->i_d
.di_format
!= XFS_DINODE_FMT_LOCAL
)
565 if (xfs_get_extsz_hint(ip
) ||
566 ip
->i_d
.di_flags
& (XFS_DIFLAG_PREALLOC
|XFS_DIFLAG_APPEND
)){
568 fixlen
= mp
->m_super
->s_maxbytes
;
571 fixlen
= XFS_ISIZE(ip
);
575 if (bmv
->bmv_length
== -1) {
576 fixlen
= XFS_FSB_TO_BB(mp
, XFS_B_TO_FSB(mp
, fixlen
));
578 max_t(__int64_t
, fixlen
- bmv
->bmv_offset
, 0);
579 } else if (bmv
->bmv_length
== 0) {
580 bmv
->bmv_entries
= 0;
582 } else if (bmv
->bmv_length
< 0) {
586 nex
= bmv
->bmv_count
- 1;
589 bmvend
= bmv
->bmv_offset
+ bmv
->bmv_length
;
592 if (bmv
->bmv_count
> ULONG_MAX
/ sizeof(struct getbmapx
))
594 out
= kmem_zalloc_large(bmv
->bmv_count
* sizeof(struct getbmapx
), 0);
598 xfs_ilock(ip
, XFS_IOLOCK_SHARED
);
599 if (whichfork
== XFS_DATA_FORK
) {
600 if (!(iflags
& BMV_IF_DELALLOC
) &&
601 (ip
->i_delayed_blks
|| XFS_ISIZE(ip
) > ip
->i_d
.di_size
)) {
602 error
= filemap_write_and_wait(VFS_I(ip
)->i_mapping
);
604 goto out_unlock_iolock
;
607 * Even after flushing the inode, there can still be
608 * delalloc blocks on the inode beyond EOF due to
609 * speculative preallocation. These are not removed
610 * until the release function is called or the inode
611 * is inactivated. Hence we cannot assert here that
612 * ip->i_delayed_blks == 0.
616 lock
= xfs_ilock_data_map_shared(ip
);
618 lock
= xfs_ilock_attr_map_shared(ip
);
622 * Don't let nex be bigger than the number of extents
623 * we can have assuming alternating holes and real extents.
625 if (nex
> XFS_IFORK_NEXTENTS(ip
, whichfork
) * 2 + 1)
626 nex
= XFS_IFORK_NEXTENTS(ip
, whichfork
) * 2 + 1;
628 bmapi_flags
= xfs_bmapi_aflag(whichfork
);
629 if (!(iflags
& BMV_IF_PREALLOC
))
630 bmapi_flags
|= XFS_BMAPI_IGSTATE
;
633 * Allocate enough space to handle "subnex" maps at a time.
637 map
= kmem_alloc(subnex
* sizeof(*map
), KM_MAYFAIL
| KM_NOFS
);
639 goto out_unlock_ilock
;
641 bmv
->bmv_entries
= 0;
643 if (XFS_IFORK_NEXTENTS(ip
, whichfork
) == 0 &&
644 (whichfork
== XFS_ATTR_FORK
|| !(iflags
& BMV_IF_DELALLOC
))) {
652 nmap
= (nexleft
> subnex
) ? subnex
: nexleft
;
653 error
= xfs_bmapi_read(ip
, XFS_BB_TO_FSBT(mp
, bmv
->bmv_offset
),
654 XFS_BB_TO_FSB(mp
, bmv
->bmv_length
),
655 map
, &nmap
, bmapi_flags
);
658 ASSERT(nmap
<= subnex
);
660 for (i
= 0; i
< nmap
&& nexleft
&& bmv
->bmv_length
; i
++) {
661 out
[cur_ext
].bmv_oflags
= 0;
662 if (map
[i
].br_state
== XFS_EXT_UNWRITTEN
)
663 out
[cur_ext
].bmv_oflags
|= BMV_OF_PREALLOC
;
664 else if (map
[i
].br_startblock
== DELAYSTARTBLOCK
)
665 out
[cur_ext
].bmv_oflags
|= BMV_OF_DELALLOC
;
666 out
[cur_ext
].bmv_offset
=
667 XFS_FSB_TO_BB(mp
, map
[i
].br_startoff
);
668 out
[cur_ext
].bmv_length
=
669 XFS_FSB_TO_BB(mp
, map
[i
].br_blockcount
);
670 out
[cur_ext
].bmv_unused1
= 0;
671 out
[cur_ext
].bmv_unused2
= 0;
674 * delayed allocation extents that start beyond EOF can
675 * occur due to speculative EOF allocation when the
676 * delalloc extent is larger than the largest freespace
677 * extent at conversion time. These extents cannot be
678 * converted by data writeback, so can exist here even
679 * if we are not supposed to be finding delalloc
682 if (map
[i
].br_startblock
== DELAYSTARTBLOCK
&&
683 map
[i
].br_startoff
<= XFS_B_TO_FSB(mp
, XFS_ISIZE(ip
)))
684 ASSERT((iflags
& BMV_IF_DELALLOC
) != 0);
686 if (map
[i
].br_startblock
== HOLESTARTBLOCK
&&
687 whichfork
== XFS_ATTR_FORK
) {
688 /* came to the end of attribute fork */
689 out
[cur_ext
].bmv_oflags
|= BMV_OF_LAST
;
693 if (!xfs_getbmapx_fix_eof_hole(ip
, &out
[cur_ext
],
695 map
[i
].br_startblock
))
699 out
[cur_ext
].bmv_offset
+
700 out
[cur_ext
].bmv_length
;
702 max_t(__int64_t
, 0, bmvend
- bmv
->bmv_offset
);
705 * In case we don't want to return the hole,
706 * don't increase cur_ext so that we can reuse
707 * it in the next loop.
709 if ((iflags
& BMV_IF_NO_HOLES
) &&
710 map
[i
].br_startblock
== HOLESTARTBLOCK
) {
711 memset(&out
[cur_ext
], 0, sizeof(out
[cur_ext
]));
719 } while (nmap
&& nexleft
&& bmv
->bmv_length
);
724 xfs_iunlock(ip
, lock
);
726 xfs_iunlock(ip
, XFS_IOLOCK_SHARED
);
728 for (i
= 0; i
< cur_ext
; i
++) {
729 int full
= 0; /* user array is full */
731 /* format results & advance arg */
732 error
= formatter(&arg
, &out
[i
], &full
);
742 * dead simple method of punching delalyed allocation blocks from a range in
743 * the inode. Walks a block at a time so will be slow, but is only executed in
744 * rare error cases so the overhead is not critical. This will always punch out
745 * both the start and end blocks, even if the ranges only partially overlap
746 * them, so it is up to the caller to ensure that partial blocks are not
750 xfs_bmap_punch_delalloc_range(
751 struct xfs_inode
*ip
,
752 xfs_fileoff_t start_fsb
,
753 xfs_fileoff_t length
)
755 xfs_fileoff_t remaining
= length
;
758 ASSERT(xfs_isilocked(ip
, XFS_ILOCK_EXCL
));
762 xfs_bmbt_irec_t imap
;
764 xfs_fsblock_t firstblock
;
765 xfs_bmap_free_t flist
;
768 * Map the range first and check that it is a delalloc extent
769 * before trying to unmap the range. Otherwise we will be
770 * trying to remove a real extent (which requires a
771 * transaction) or a hole, which is probably a bad idea...
773 error
= xfs_bmapi_read(ip
, start_fsb
, 1, &imap
, &nimaps
,
777 /* something screwed, just bail */
778 if (!XFS_FORCED_SHUTDOWN(ip
->i_mount
)) {
779 xfs_alert(ip
->i_mount
,
780 "Failed delalloc mapping lookup ino %lld fsb %lld.",
781 ip
->i_ino
, start_fsb
);
789 if (imap
.br_startblock
!= DELAYSTARTBLOCK
) {
790 /* been converted, ignore */
793 WARN_ON(imap
.br_blockcount
== 0);
796 * Note: while we initialise the firstblock/flist pair, they
797 * should never be used because blocks should never be
798 * allocated or freed for a delalloc extent and hence we need
799 * don't cancel or finish them after the xfs_bunmapi() call.
801 xfs_bmap_init(&flist
, &firstblock
);
802 error
= xfs_bunmapi(NULL
, ip
, start_fsb
, 1, 0, 1, &firstblock
,
807 ASSERT(!flist
.xbf_count
&& !flist
.xbf_first
);
811 } while(remaining
> 0);
817 * Test whether it is appropriate to check an inode for and free post EOF
818 * blocks. The 'force' parameter determines whether we should also consider
819 * regular files that are marked preallocated or append-only.
822 xfs_can_free_eofblocks(struct xfs_inode
*ip
, bool force
)
824 /* prealloc/delalloc exists only on regular files */
825 if (!S_ISREG(ip
->i_d
.di_mode
))
829 * Zero sized files with no cached pages and delalloc blocks will not
830 * have speculative prealloc/delalloc blocks to remove.
832 if (VFS_I(ip
)->i_size
== 0 &&
833 VFS_I(ip
)->i_mapping
->nrpages
== 0 &&
834 ip
->i_delayed_blks
== 0)
837 /* If we haven't read in the extent list, then don't do it now. */
838 if (!(ip
->i_df
.if_flags
& XFS_IFEXTENTS
))
842 * Do not free real preallocated or append-only files unless the file
843 * has delalloc blocks and we are forced to remove them.
845 if (ip
->i_d
.di_flags
& (XFS_DIFLAG_PREALLOC
| XFS_DIFLAG_APPEND
))
846 if (!force
|| ip
->i_delayed_blks
== 0)
853 * This is called by xfs_inactive to free any blocks beyond eof
854 * when the link count isn't zero and by xfs_dm_punch_hole() when
855 * punching a hole to EOF.
865 xfs_fileoff_t end_fsb
;
866 xfs_fileoff_t last_fsb
;
867 xfs_filblks_t map_len
;
869 xfs_bmbt_irec_t imap
;
872 * Figure out if there are any blocks beyond the end
873 * of the file. If not, then there is nothing to do.
875 end_fsb
= XFS_B_TO_FSB(mp
, (xfs_ufsize_t
)XFS_ISIZE(ip
));
876 last_fsb
= XFS_B_TO_FSB(mp
, mp
->m_super
->s_maxbytes
);
877 if (last_fsb
<= end_fsb
)
879 map_len
= last_fsb
- end_fsb
;
882 xfs_ilock(ip
, XFS_ILOCK_SHARED
);
883 error
= xfs_bmapi_read(ip
, end_fsb
, map_len
, &imap
, &nimaps
, 0);
884 xfs_iunlock(ip
, XFS_ILOCK_SHARED
);
886 if (!error
&& (nimaps
!= 0) &&
887 (imap
.br_startblock
!= HOLESTARTBLOCK
||
888 ip
->i_delayed_blks
)) {
890 * Attach the dquots to the inode up front.
892 error
= xfs_qm_dqattach(ip
, 0);
897 * There are blocks after the end of file.
898 * Free them up now by truncating the file to
901 tp
= xfs_trans_alloc(mp
, XFS_TRANS_INACTIVE
);
904 if (!xfs_ilock_nowait(ip
, XFS_IOLOCK_EXCL
)) {
905 xfs_trans_cancel(tp
);
910 error
= xfs_trans_reserve(tp
, &M_RES(mp
)->tr_itruncate
, 0, 0);
912 ASSERT(XFS_FORCED_SHUTDOWN(mp
));
913 xfs_trans_cancel(tp
);
915 xfs_iunlock(ip
, XFS_IOLOCK_EXCL
);
919 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
920 xfs_trans_ijoin(tp
, ip
, 0);
923 * Do not update the on-disk file size. If we update the
924 * on-disk file size and then the system crashes before the
925 * contents of the file are flushed to disk then the files
926 * may be full of holes (ie NULL files bug).
928 error
= xfs_itruncate_extents(&tp
, ip
, XFS_DATA_FORK
,
932 * If we get an error at this point we simply don't
933 * bother truncating the file.
935 xfs_trans_cancel(tp
);
937 error
= xfs_trans_commit(tp
);
939 xfs_inode_clear_eofblocks_tag(ip
);
942 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
944 xfs_iunlock(ip
, XFS_IOLOCK_EXCL
);
950 xfs_alloc_file_space(
951 struct xfs_inode
*ip
,
956 xfs_mount_t
*mp
= ip
->i_mount
;
958 xfs_filblks_t allocated_fsb
;
959 xfs_filblks_t allocatesize_fsb
;
960 xfs_extlen_t extsz
, temp
;
961 xfs_fileoff_t startoffset_fsb
;
962 xfs_fsblock_t firstfsb
;
967 xfs_bmbt_irec_t imaps
[1], *imapp
;
968 xfs_bmap_free_t free_list
;
969 uint qblocks
, resblks
, resrtextents
;
972 trace_xfs_alloc_file_space(ip
);
974 if (XFS_FORCED_SHUTDOWN(mp
))
977 error
= xfs_qm_dqattach(ip
, 0);
984 rt
= XFS_IS_REALTIME_INODE(ip
);
985 extsz
= xfs_get_extsz_hint(ip
);
990 startoffset_fsb
= XFS_B_TO_FSBT(mp
, offset
);
991 allocatesize_fsb
= XFS_B_TO_FSB(mp
, count
);
994 * Allocate file space until done or until there is an error
996 while (allocatesize_fsb
&& !error
) {
1000 * Determine space reservations for data/realtime.
1002 if (unlikely(extsz
)) {
1003 s
= startoffset_fsb
;
1006 e
= startoffset_fsb
+ allocatesize_fsb
;
1007 if ((temp
= do_mod(startoffset_fsb
, extsz
)))
1009 if ((temp
= do_mod(e
, extsz
)))
1013 e
= allocatesize_fsb
;
1017 * The transaction reservation is limited to a 32-bit block
1018 * count, hence we need to limit the number of blocks we are
1019 * trying to reserve to avoid an overflow. We can't allocate
1020 * more than @nimaps extents, and an extent is limited on disk
1021 * to MAXEXTLEN (21 bits), so use that to enforce the limit.
1023 resblks
= min_t(xfs_fileoff_t
, (e
- s
), (MAXEXTLEN
* nimaps
));
1025 resrtextents
= qblocks
= resblks
;
1026 resrtextents
/= mp
->m_sb
.sb_rextsize
;
1027 resblks
= XFS_DIOSTRAT_SPACE_RES(mp
, 0);
1028 quota_flag
= XFS_QMOPT_RES_RTBLKS
;
1031 resblks
= qblocks
= XFS_DIOSTRAT_SPACE_RES(mp
, resblks
);
1032 quota_flag
= XFS_QMOPT_RES_REGBLKS
;
1036 * Allocate and setup the transaction.
1038 tp
= xfs_trans_alloc(mp
, XFS_TRANS_DIOSTRAT
);
1039 error
= xfs_trans_reserve(tp
, &M_RES(mp
)->tr_write
,
1040 resblks
, resrtextents
);
1042 * Check for running out of space
1046 * Free the transaction structure.
1048 ASSERT(error
== -ENOSPC
|| XFS_FORCED_SHUTDOWN(mp
));
1049 xfs_trans_cancel(tp
);
1052 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
1053 error
= xfs_trans_reserve_quota_nblks(tp
, ip
, qblocks
,
1058 xfs_trans_ijoin(tp
, ip
, 0);
1060 xfs_bmap_init(&free_list
, &firstfsb
);
1061 error
= xfs_bmapi_write(tp
, ip
, startoffset_fsb
,
1062 allocatesize_fsb
, alloc_type
, &firstfsb
,
1063 resblks
, imapp
, &nimaps
, &free_list
);
1068 * Complete the transaction
1070 error
= xfs_bmap_finish(&tp
, &free_list
, NULL
);
1074 error
= xfs_trans_commit(tp
);
1075 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
1079 allocated_fsb
= imapp
->br_blockcount
;
1086 startoffset_fsb
+= allocated_fsb
;
1087 allocatesize_fsb
-= allocated_fsb
;
1092 error0
: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */
1093 xfs_bmap_cancel(&free_list
);
1094 xfs_trans_unreserve_quota_nblks(tp
, ip
, (long)qblocks
, 0, quota_flag
);
1096 error1
: /* Just cancel transaction */
1097 xfs_trans_cancel(tp
);
1098 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
1103 * Zero file bytes between startoff and endoff inclusive.
1104 * The iolock is held exclusive and no blocks are buffered.
1106 * This function is used by xfs_free_file_space() to zero
1107 * partial blocks when the range to free is not block aligned.
1108 * When unreserving space with boundaries that are not block
1109 * aligned we round up the start and round down the end
1110 * boundaries and then use this function to zero the parts of
1111 * the blocks that got dropped during the rounding.
1114 xfs_zero_remaining_bytes(
1119 xfs_bmbt_irec_t imap
;
1120 xfs_fileoff_t offset_fsb
;
1121 xfs_off_t lastoffset
;
1124 xfs_mount_t
*mp
= ip
->i_mount
;
1129 * Avoid doing I/O beyond eof - it's not necessary
1130 * since nothing can read beyond eof. The space will
1131 * be zeroed when the file is extended anyway.
1133 if (startoff
>= XFS_ISIZE(ip
))
1136 if (endoff
> XFS_ISIZE(ip
))
1137 endoff
= XFS_ISIZE(ip
);
1139 for (offset
= startoff
; offset
<= endoff
; offset
= lastoffset
+ 1) {
1142 offset_fsb
= XFS_B_TO_FSBT(mp
, offset
);
1145 lock_mode
= xfs_ilock_data_map_shared(ip
);
1146 error
= xfs_bmapi_read(ip
, offset_fsb
, 1, &imap
, &nimap
, 0);
1147 xfs_iunlock(ip
, lock_mode
);
1149 if (error
|| nimap
< 1)
1151 ASSERT(imap
.br_blockcount
>= 1);
1152 ASSERT(imap
.br_startoff
== offset_fsb
);
1153 ASSERT(imap
.br_startblock
!= DELAYSTARTBLOCK
);
1155 if (imap
.br_startblock
== HOLESTARTBLOCK
||
1156 imap
.br_state
== XFS_EXT_UNWRITTEN
) {
1157 /* skip the entire extent */
1158 lastoffset
= XFS_FSB_TO_B(mp
, imap
.br_startoff
+
1159 imap
.br_blockcount
) - 1;
1163 lastoffset
= XFS_FSB_TO_B(mp
, imap
.br_startoff
+ 1) - 1;
1164 if (lastoffset
> endoff
)
1165 lastoffset
= endoff
;
1167 /* DAX can just zero the backing device directly */
1168 if (IS_DAX(VFS_I(ip
))) {
1169 error
= dax_zero_page_range(VFS_I(ip
), offset
,
1170 lastoffset
- offset
+ 1,
1171 xfs_get_blocks_direct
);
1177 error
= xfs_buf_read_uncached(XFS_IS_REALTIME_INODE(ip
) ?
1178 mp
->m_rtdev_targp
: mp
->m_ddev_targp
,
1179 xfs_fsb_to_db(ip
, imap
.br_startblock
),
1180 BTOBB(mp
->m_sb
.sb_blocksize
),
1186 (offset
- XFS_FSB_TO_B(mp
, imap
.br_startoff
)),
1187 0, lastoffset
- offset
+ 1);
1189 error
= xfs_bwrite(bp
);
1198 xfs_free_file_space(
1199 struct xfs_inode
*ip
,
1204 xfs_fileoff_t endoffset_fsb
;
1206 xfs_fsblock_t firstfsb
;
1207 xfs_bmap_free_t free_list
;
1208 xfs_bmbt_irec_t imap
;
1210 xfs_off_t iendoffset
;
1217 xfs_fileoff_t startoffset_fsb
;
1222 trace_xfs_free_file_space(ip
);
1224 error
= xfs_qm_dqattach(ip
, 0);
1229 if (len
<= 0) /* if nothing being freed */
1231 rt
= XFS_IS_REALTIME_INODE(ip
);
1232 startoffset_fsb
= XFS_B_TO_FSB(mp
, offset
);
1233 endoffset_fsb
= XFS_B_TO_FSBT(mp
, offset
+ len
);
1235 /* wait for the completion of any pending DIOs */
1236 inode_dio_wait(VFS_I(ip
));
1238 rounding
= max_t(xfs_off_t
, 1 << mp
->m_sb
.sb_blocklog
, PAGE_CACHE_SIZE
);
1239 ioffset
= round_down(offset
, rounding
);
1240 iendoffset
= round_up(offset
+ len
, rounding
) - 1;
1241 error
= filemap_write_and_wait_range(VFS_I(ip
)->i_mapping
, ioffset
,
1245 truncate_pagecache_range(VFS_I(ip
), ioffset
, iendoffset
);
1248 * Need to zero the stuff we're not freeing, on disk.
1249 * If it's a realtime file & can't use unwritten extents then we
1250 * actually need to zero the extent edges. Otherwise xfs_bunmapi
1251 * will take care of it for us.
1253 if (rt
&& !xfs_sb_version_hasextflgbit(&mp
->m_sb
)) {
1255 error
= xfs_bmapi_read(ip
, startoffset_fsb
, 1,
1259 ASSERT(nimap
== 0 || nimap
== 1);
1260 if (nimap
&& imap
.br_startblock
!= HOLESTARTBLOCK
) {
1263 ASSERT(imap
.br_startblock
!= DELAYSTARTBLOCK
);
1264 block
= imap
.br_startblock
;
1265 mod
= do_div(block
, mp
->m_sb
.sb_rextsize
);
1267 startoffset_fsb
+= mp
->m_sb
.sb_rextsize
- mod
;
1270 error
= xfs_bmapi_read(ip
, endoffset_fsb
- 1, 1,
1274 ASSERT(nimap
== 0 || nimap
== 1);
1275 if (nimap
&& imap
.br_startblock
!= HOLESTARTBLOCK
) {
1276 ASSERT(imap
.br_startblock
!= DELAYSTARTBLOCK
);
1278 if (mod
&& (mod
!= mp
->m_sb
.sb_rextsize
))
1279 endoffset_fsb
-= mod
;
1282 if ((done
= (endoffset_fsb
<= startoffset_fsb
)))
1284 * One contiguous piece to clear
1286 error
= xfs_zero_remaining_bytes(ip
, offset
, offset
+ len
- 1);
1289 * Some full blocks, possibly two pieces to clear
1291 if (offset
< XFS_FSB_TO_B(mp
, startoffset_fsb
))
1292 error
= xfs_zero_remaining_bytes(ip
, offset
,
1293 XFS_FSB_TO_B(mp
, startoffset_fsb
) - 1);
1295 XFS_FSB_TO_B(mp
, endoffset_fsb
) < offset
+ len
)
1296 error
= xfs_zero_remaining_bytes(ip
,
1297 XFS_FSB_TO_B(mp
, endoffset_fsb
),
1302 * free file space until done or until there is an error
1304 resblks
= XFS_DIOSTRAT_SPACE_RES(mp
, 0);
1305 while (!error
&& !done
) {
1308 * allocate and setup the transaction. Allow this
1309 * transaction to dip into the reserve blocks to ensure
1310 * the freeing of the space succeeds at ENOSPC.
1312 tp
= xfs_trans_alloc(mp
, XFS_TRANS_DIOSTRAT
);
1313 error
= xfs_trans_reserve(tp
, &M_RES(mp
)->tr_write
, resblks
, 0);
1316 * check for running out of space
1320 * Free the transaction structure.
1322 ASSERT(error
== -ENOSPC
|| XFS_FORCED_SHUTDOWN(mp
));
1323 xfs_trans_cancel(tp
);
1326 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
1327 error
= xfs_trans_reserve_quota(tp
, mp
,
1328 ip
->i_udquot
, ip
->i_gdquot
, ip
->i_pdquot
,
1329 resblks
, 0, XFS_QMOPT_RES_REGBLKS
);
1333 xfs_trans_ijoin(tp
, ip
, 0);
1336 * issue the bunmapi() call to free the blocks
1338 xfs_bmap_init(&free_list
, &firstfsb
);
1339 error
= xfs_bunmapi(tp
, ip
, startoffset_fsb
,
1340 endoffset_fsb
- startoffset_fsb
,
1341 0, 2, &firstfsb
, &free_list
, &done
);
1346 * complete the transaction
1348 error
= xfs_bmap_finish(&tp
, &free_list
, NULL
);
1352 error
= xfs_trans_commit(tp
);
1353 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
1360 xfs_bmap_cancel(&free_list
);
1362 xfs_trans_cancel(tp
);
1363 xfs_iunlock(ip
, XFS_ILOCK_EXCL
);
1368 * Preallocate and zero a range of a file. This mechanism has the allocation
1369 * semantics of fallocate and in addition converts data in the range to zeroes.
1372 xfs_zero_file_space(
1373 struct xfs_inode
*ip
,
1377 struct xfs_mount
*mp
= ip
->i_mount
;
1381 trace_xfs_zero_file_space(ip
);
1383 blksize
= 1 << mp
->m_sb
.sb_blocklog
;
1386 * Punch a hole and prealloc the range. We use hole punch rather than
1387 * unwritten extent conversion for two reasons:
1389 * 1.) Hole punch handles partial block zeroing for us.
1391 * 2.) If prealloc returns ENOSPC, the file range is still zero-valued
1392 * by virtue of the hole punch.
1394 error
= xfs_free_file_space(ip
, offset
, len
);
1398 error
= xfs_alloc_file_space(ip
, round_down(offset
, blksize
),
1399 round_up(offset
+ len
, blksize
) -
1400 round_down(offset
, blksize
),
1401 XFS_BMAPI_PREALLOC
);
1408 * @next_fsb will keep track of the extent currently undergoing shift.
1409 * @stop_fsb will keep track of the extent at which we have to stop.
1410 * If we are shifting left, we will start with block (offset + len) and
1411 * shift each extent till last extent.
1412 * If we are shifting right, we will start with last extent inside file space
1413 * and continue until we reach the block corresponding to offset.
1416 xfs_shift_file_space(
1417 struct xfs_inode
*ip
,
1420 enum shift_direction direction
)
1423 struct xfs_mount
*mp
= ip
->i_mount
;
1424 struct xfs_trans
*tp
;
1426 struct xfs_bmap_free free_list
;
1427 xfs_fsblock_t first_block
;
1428 xfs_fileoff_t stop_fsb
;
1429 xfs_fileoff_t next_fsb
;
1430 xfs_fileoff_t shift_fsb
;
1432 ASSERT(direction
== SHIFT_LEFT
|| direction
== SHIFT_RIGHT
);
1434 if (direction
== SHIFT_LEFT
) {
1435 next_fsb
= XFS_B_TO_FSB(mp
, offset
+ len
);
1436 stop_fsb
= XFS_B_TO_FSB(mp
, VFS_I(ip
)->i_size
);
1439 * If right shift, delegate the work of initialization of
1440 * next_fsb to xfs_bmap_shift_extent as it has ilock held.
1442 next_fsb
= NULLFSBLOCK
;
1443 stop_fsb
= XFS_B_TO_FSB(mp
, offset
);
1446 shift_fsb
= XFS_B_TO_FSB(mp
, len
);
1449 * Trim eofblocks to avoid shifting uninitialized post-eof preallocation
1450 * into the accessible region of the file.
1452 if (xfs_can_free_eofblocks(ip
, true)) {
1453 error
= xfs_free_eofblocks(mp
, ip
, false);
1459 * Writeback and invalidate cache for the remainder of the file as we're
1460 * about to shift down every extent from offset to EOF.
1462 error
= filemap_write_and_wait_range(VFS_I(ip
)->i_mapping
,
1466 error
= invalidate_inode_pages2_range(VFS_I(ip
)->i_mapping
,
1467 offset
>> PAGE_CACHE_SHIFT
, -1);
1472 * The extent shiting code works on extent granularity. So, if
1473 * stop_fsb is not the starting block of extent, we need to split
1474 * the extent at stop_fsb.
1476 if (direction
== SHIFT_RIGHT
) {
1477 error
= xfs_bmap_split_extent(ip
, stop_fsb
);
1482 while (!error
&& !done
) {
1483 tp
= xfs_trans_alloc(mp
, XFS_TRANS_DIOSTRAT
);
1485 * We would need to reserve permanent block for transaction.
1486 * This will come into picture when after shifting extent into
1487 * hole we found that adjacent extents can be merged which
1488 * may lead to freeing of a block during record update.
1490 error
= xfs_trans_reserve(tp
, &M_RES(mp
)->tr_write
,
1491 XFS_DIOSTRAT_SPACE_RES(mp
, 0), 0);
1493 xfs_trans_cancel(tp
);
1497 xfs_ilock(ip
, XFS_ILOCK_EXCL
);
1498 error
= xfs_trans_reserve_quota(tp
, mp
, ip
->i_udquot
,
1499 ip
->i_gdquot
, ip
->i_pdquot
,
1500 XFS_DIOSTRAT_SPACE_RES(mp
, 0), 0,
1501 XFS_QMOPT_RES_REGBLKS
);
1503 goto out_trans_cancel
;
1505 xfs_trans_ijoin(tp
, ip
, XFS_ILOCK_EXCL
);
1507 xfs_bmap_init(&free_list
, &first_block
);
1510 * We are using the write transaction in which max 2 bmbt
1511 * updates are allowed
1513 error
= xfs_bmap_shift_extents(tp
, ip
, &next_fsb
, shift_fsb
,
1514 &done
, stop_fsb
, &first_block
, &free_list
,
1515 direction
, XFS_BMAP_MAX_SHIFT_EXTENTS
);
1517 goto out_bmap_cancel
;
1519 error
= xfs_bmap_finish(&tp
, &free_list
, NULL
);
1521 goto out_bmap_cancel
;
1523 error
= xfs_trans_commit(tp
);
1529 xfs_bmap_cancel(&free_list
);
1531 xfs_trans_cancel(tp
);
1536 * xfs_collapse_file_space()
1537 * This routine frees disk space and shift extent for the given file.
1538 * The first thing we do is to free data blocks in the specified range
1539 * by calling xfs_free_file_space(). It would also sync dirty data
1540 * and invalidate page cache over the region on which collapse range
1541 * is working. And Shift extent records to the left to cover a hole.
1548 xfs_collapse_file_space(
1549 struct xfs_inode
*ip
,
1555 ASSERT(xfs_isilocked(ip
, XFS_IOLOCK_EXCL
));
1556 trace_xfs_collapse_file_space(ip
);
1558 error
= xfs_free_file_space(ip
, offset
, len
);
1562 return xfs_shift_file_space(ip
, offset
, len
, SHIFT_LEFT
);
1566 * xfs_insert_file_space()
1567 * This routine create hole space by shifting extents for the given file.
1568 * The first thing we do is to sync dirty data and invalidate page cache
1569 * over the region on which insert range is working. And split an extent
1570 * to two extents at given offset by calling xfs_bmap_split_extent.
1571 * And shift all extent records which are laying between [offset,
1572 * last allocated extent] to the right to reserve hole range.
1578 xfs_insert_file_space(
1579 struct xfs_inode
*ip
,
1583 ASSERT(xfs_isilocked(ip
, XFS_IOLOCK_EXCL
));
1584 trace_xfs_insert_file_space(ip
);
1586 return xfs_shift_file_space(ip
, offset
, len
, SHIFT_RIGHT
);
1590 * We need to check that the format of the data fork in the temporary inode is
1591 * valid for the target inode before doing the swap. This is not a problem with
1592 * attr1 because of the fixed fork offset, but attr2 has a dynamically sized
1593 * data fork depending on the space the attribute fork is taking so we can get
1594 * invalid formats on the target inode.
1596 * E.g. target has space for 7 extents in extent format, temp inode only has
1597 * space for 6. If we defragment down to 7 extents, then the tmp format is a
1598 * btree, but when swapped it needs to be in extent format. Hence we can't just
1599 * blindly swap data forks on attr2 filesystems.
1601 * Note that we check the swap in both directions so that we don't end up with
1602 * a corrupt temporary inode, either.
1604 * Note that fixing the way xfs_fsr sets up the attribute fork in the source
1605 * inode will prevent this situation from occurring, so all we do here is
1606 * reject and log the attempt. basically we are putting the responsibility on
1607 * userspace to get this right.
1610 xfs_swap_extents_check_format(
1611 xfs_inode_t
*ip
, /* target inode */
1612 xfs_inode_t
*tip
) /* tmp inode */
1615 /* Should never get a local format */
1616 if (ip
->i_d
.di_format
== XFS_DINODE_FMT_LOCAL
||
1617 tip
->i_d
.di_format
== XFS_DINODE_FMT_LOCAL
)
1621 * if the target inode has less extents that then temporary inode then
1622 * why did userspace call us?
1624 if (ip
->i_d
.di_nextents
< tip
->i_d
.di_nextents
)
1628 * if the target inode is in extent form and the temp inode is in btree
1629 * form then we will end up with the target inode in the wrong format
1630 * as we already know there are less extents in the temp inode.
1632 if (ip
->i_d
.di_format
== XFS_DINODE_FMT_EXTENTS
&&
1633 tip
->i_d
.di_format
== XFS_DINODE_FMT_BTREE
)
1636 /* Check temp in extent form to max in target */
1637 if (tip
->i_d
.di_format
== XFS_DINODE_FMT_EXTENTS
&&
1638 XFS_IFORK_NEXTENTS(tip
, XFS_DATA_FORK
) >
1639 XFS_IFORK_MAXEXT(ip
, XFS_DATA_FORK
))
1642 /* Check target in extent form to max in temp */
1643 if (ip
->i_d
.di_format
== XFS_DINODE_FMT_EXTENTS
&&
1644 XFS_IFORK_NEXTENTS(ip
, XFS_DATA_FORK
) >
1645 XFS_IFORK_MAXEXT(tip
, XFS_DATA_FORK
))
1649 * If we are in a btree format, check that the temp root block will fit
1650 * in the target and that it has enough extents to be in btree format
1653 * Note that we have to be careful to allow btree->extent conversions
1654 * (a common defrag case) which will occur when the temp inode is in
1657 if (tip
->i_d
.di_format
== XFS_DINODE_FMT_BTREE
) {
1658 if (XFS_IFORK_BOFF(ip
) &&
1659 XFS_BMAP_BMDR_SPACE(tip
->i_df
.if_broot
) > XFS_IFORK_BOFF(ip
))
1661 if (XFS_IFORK_NEXTENTS(tip
, XFS_DATA_FORK
) <=
1662 XFS_IFORK_MAXEXT(ip
, XFS_DATA_FORK
))
1666 /* Reciprocal target->temp btree format checks */
1667 if (ip
->i_d
.di_format
== XFS_DINODE_FMT_BTREE
) {
1668 if (XFS_IFORK_BOFF(tip
) &&
1669 XFS_BMAP_BMDR_SPACE(ip
->i_df
.if_broot
) > XFS_IFORK_BOFF(tip
))
1671 if (XFS_IFORK_NEXTENTS(ip
, XFS_DATA_FORK
) <=
1672 XFS_IFORK_MAXEXT(tip
, XFS_DATA_FORK
))
1680 xfs_swap_extent_flush(
1681 struct xfs_inode
*ip
)
1685 error
= filemap_write_and_wait(VFS_I(ip
)->i_mapping
);
1688 truncate_pagecache_range(VFS_I(ip
), 0, -1);
1690 /* Verify O_DIRECT for ftmp */
1691 if (VFS_I(ip
)->i_mapping
->nrpages
)
1698 xfs_inode_t
*ip
, /* target inode */
1699 xfs_inode_t
*tip
, /* tmp inode */
1702 xfs_mount_t
*mp
= ip
->i_mount
;
1704 xfs_bstat_t
*sbp
= &sxp
->sx_stat
;
1705 xfs_ifork_t
*tempifp
, *ifp
, *tifp
;
1706 int src_log_flags
, target_log_flags
;
1713 tempifp
= kmem_alloc(sizeof(xfs_ifork_t
), KM_MAYFAIL
);
1720 * Lock the inodes against other IO, page faults and truncate to
1721 * begin with. Then we can ensure the inodes are flushed and have no
1722 * page cache safely. Once we have done this we can take the ilocks and
1723 * do the rest of the checks.
1725 lock_flags
= XFS_IOLOCK_EXCL
| XFS_MMAPLOCK_EXCL
;
1726 xfs_lock_two_inodes(ip
, tip
, XFS_IOLOCK_EXCL
);
1727 xfs_lock_two_inodes(ip
, tip
, XFS_MMAPLOCK_EXCL
);
1729 /* Verify that both files have the same format */
1730 if ((ip
->i_d
.di_mode
& S_IFMT
) != (tip
->i_d
.di_mode
& S_IFMT
)) {
1735 /* Verify both files are either real-time or non-realtime */
1736 if (XFS_IS_REALTIME_INODE(ip
) != XFS_IS_REALTIME_INODE(tip
)) {
1741 error
= xfs_swap_extent_flush(ip
);
1744 error
= xfs_swap_extent_flush(tip
);
1748 tp
= xfs_trans_alloc(mp
, XFS_TRANS_SWAPEXT
);
1749 error
= xfs_trans_reserve(tp
, &M_RES(mp
)->tr_ichange
, 0, 0);
1751 xfs_trans_cancel(tp
);
1756 * Lock and join the inodes to the tansaction so that transaction commit
1757 * or cancel will unlock the inodes from this point onwards.
1759 xfs_lock_two_inodes(ip
, tip
, XFS_ILOCK_EXCL
);
1760 lock_flags
|= XFS_ILOCK_EXCL
;
1761 xfs_trans_ijoin(tp
, ip
, lock_flags
);
1762 xfs_trans_ijoin(tp
, tip
, lock_flags
);
1765 /* Verify all data are being swapped */
1766 if (sxp
->sx_offset
!= 0 ||
1767 sxp
->sx_length
!= ip
->i_d
.di_size
||
1768 sxp
->sx_length
!= tip
->i_d
.di_size
) {
1770 goto out_trans_cancel
;
1773 trace_xfs_swap_extent_before(ip
, 0);
1774 trace_xfs_swap_extent_before(tip
, 1);
1776 /* check inode formats now that data is flushed */
1777 error
= xfs_swap_extents_check_format(ip
, tip
);
1780 "%s: inode 0x%llx format is incompatible for exchanging.",
1781 __func__
, ip
->i_ino
);
1782 goto out_trans_cancel
;
1786 * Compare the current change & modify times with that
1787 * passed in. If they differ, we abort this swap.
1788 * This is the mechanism used to ensure the calling
1789 * process that the file was not changed out from
1792 if ((sbp
->bs_ctime
.tv_sec
!= VFS_I(ip
)->i_ctime
.tv_sec
) ||
1793 (sbp
->bs_ctime
.tv_nsec
!= VFS_I(ip
)->i_ctime
.tv_nsec
) ||
1794 (sbp
->bs_mtime
.tv_sec
!= VFS_I(ip
)->i_mtime
.tv_sec
) ||
1795 (sbp
->bs_mtime
.tv_nsec
!= VFS_I(ip
)->i_mtime
.tv_nsec
)) {
1797 goto out_trans_cancel
;
1800 * Count the number of extended attribute blocks
1802 if ( ((XFS_IFORK_Q(ip
) != 0) && (ip
->i_d
.di_anextents
> 0)) &&
1803 (ip
->i_d
.di_aformat
!= XFS_DINODE_FMT_LOCAL
)) {
1804 error
= xfs_bmap_count_blocks(tp
, ip
, XFS_ATTR_FORK
, &aforkblks
);
1806 goto out_trans_cancel
;
1808 if ( ((XFS_IFORK_Q(tip
) != 0) && (tip
->i_d
.di_anextents
> 0)) &&
1809 (tip
->i_d
.di_aformat
!= XFS_DINODE_FMT_LOCAL
)) {
1810 error
= xfs_bmap_count_blocks(tp
, tip
, XFS_ATTR_FORK
,
1813 goto out_trans_cancel
;
1817 * Before we've swapped the forks, lets set the owners of the forks
1818 * appropriately. We have to do this as we are demand paging the btree
1819 * buffers, and so the validation done on read will expect the owner
1820 * field to be correctly set. Once we change the owners, we can swap the
1823 * Note the trickiness in setting the log flags - we set the owner log
1824 * flag on the opposite inode (i.e. the inode we are setting the new
1825 * owner to be) because once we swap the forks and log that, log
1826 * recovery is going to see the fork as owned by the swapped inode,
1827 * not the pre-swapped inodes.
1829 src_log_flags
= XFS_ILOG_CORE
;
1830 target_log_flags
= XFS_ILOG_CORE
;
1831 if (ip
->i_d
.di_version
== 3 &&
1832 ip
->i_d
.di_format
== XFS_DINODE_FMT_BTREE
) {
1833 target_log_flags
|= XFS_ILOG_DOWNER
;
1834 error
= xfs_bmbt_change_owner(tp
, ip
, XFS_DATA_FORK
,
1837 goto out_trans_cancel
;
1840 if (tip
->i_d
.di_version
== 3 &&
1841 tip
->i_d
.di_format
== XFS_DINODE_FMT_BTREE
) {
1842 src_log_flags
|= XFS_ILOG_DOWNER
;
1843 error
= xfs_bmbt_change_owner(tp
, tip
, XFS_DATA_FORK
,
1846 goto out_trans_cancel
;
1850 * Swap the data forks of the inodes
1854 *tempifp
= *ifp
; /* struct copy */
1855 *ifp
= *tifp
; /* struct copy */
1856 *tifp
= *tempifp
; /* struct copy */
1859 * Fix the on-disk inode values
1861 tmp
= (__uint64_t
)ip
->i_d
.di_nblocks
;
1862 ip
->i_d
.di_nblocks
= tip
->i_d
.di_nblocks
- taforkblks
+ aforkblks
;
1863 tip
->i_d
.di_nblocks
= tmp
+ taforkblks
- aforkblks
;
1865 tmp
= (__uint64_t
) ip
->i_d
.di_nextents
;
1866 ip
->i_d
.di_nextents
= tip
->i_d
.di_nextents
;
1867 tip
->i_d
.di_nextents
= tmp
;
1869 tmp
= (__uint64_t
) ip
->i_d
.di_format
;
1870 ip
->i_d
.di_format
= tip
->i_d
.di_format
;
1871 tip
->i_d
.di_format
= tmp
;
1874 * The extents in the source inode could still contain speculative
1875 * preallocation beyond EOF (e.g. the file is open but not modified
1876 * while defrag is in progress). In that case, we need to copy over the
1877 * number of delalloc blocks the data fork in the source inode is
1878 * tracking beyond EOF so that when the fork is truncated away when the
1879 * temporary inode is unlinked we don't underrun the i_delayed_blks
1880 * counter on that inode.
1882 ASSERT(tip
->i_delayed_blks
== 0);
1883 tip
->i_delayed_blks
= ip
->i_delayed_blks
;
1884 ip
->i_delayed_blks
= 0;
1886 switch (ip
->i_d
.di_format
) {
1887 case XFS_DINODE_FMT_EXTENTS
:
1888 /* If the extents fit in the inode, fix the
1889 * pointer. Otherwise it's already NULL or
1890 * pointing to the extent.
1892 if (ip
->i_d
.di_nextents
<= XFS_INLINE_EXTS
) {
1893 ifp
->if_u1
.if_extents
=
1894 ifp
->if_u2
.if_inline_ext
;
1896 src_log_flags
|= XFS_ILOG_DEXT
;
1898 case XFS_DINODE_FMT_BTREE
:
1899 ASSERT(ip
->i_d
.di_version
< 3 ||
1900 (src_log_flags
& XFS_ILOG_DOWNER
));
1901 src_log_flags
|= XFS_ILOG_DBROOT
;
1905 switch (tip
->i_d
.di_format
) {
1906 case XFS_DINODE_FMT_EXTENTS
:
1907 /* If the extents fit in the inode, fix the
1908 * pointer. Otherwise it's already NULL or
1909 * pointing to the extent.
1911 if (tip
->i_d
.di_nextents
<= XFS_INLINE_EXTS
) {
1912 tifp
->if_u1
.if_extents
=
1913 tifp
->if_u2
.if_inline_ext
;
1915 target_log_flags
|= XFS_ILOG_DEXT
;
1917 case XFS_DINODE_FMT_BTREE
:
1918 target_log_flags
|= XFS_ILOG_DBROOT
;
1919 ASSERT(tip
->i_d
.di_version
< 3 ||
1920 (target_log_flags
& XFS_ILOG_DOWNER
));
1924 xfs_trans_log_inode(tp
, ip
, src_log_flags
);
1925 xfs_trans_log_inode(tp
, tip
, target_log_flags
);
1928 * If this is a synchronous mount, make sure that the
1929 * transaction goes to disk before returning to the user.
1931 if (mp
->m_flags
& XFS_MOUNT_WSYNC
)
1932 xfs_trans_set_sync(tp
);
1934 error
= xfs_trans_commit(tp
);
1936 trace_xfs_swap_extent_after(ip
, 0);
1937 trace_xfs_swap_extent_after(tip
, 1);
1943 xfs_iunlock(ip
, lock_flags
);
1944 xfs_iunlock(tip
, lock_flags
);
1948 xfs_trans_cancel(tp
);