2 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 #include <linux/log2.h>
22 #include "xfs_format.h"
23 #include "xfs_log_format.h"
24 #include "xfs_trans_resv.h"
25 #include "xfs_mount.h"
26 #include "xfs_inode.h"
27 #include "xfs_trans.h"
28 #include "xfs_inode_item.h"
29 #include "xfs_bmap_btree.h"
31 #include "xfs_error.h"
32 #include "xfs_trace.h"
33 #include "xfs_attr_sf.h"
34 #include "xfs_da_format.h"
36 kmem_zone_t
*xfs_ifork_zone
;
38 STATIC
int xfs_iformat_local(xfs_inode_t
*, xfs_dinode_t
*, int, int);
39 STATIC
int xfs_iformat_extents(xfs_inode_t
*, xfs_dinode_t
*, int);
40 STATIC
int xfs_iformat_btree(xfs_inode_t
*, xfs_dinode_t
*, int);
44 * Make sure that the extents in the given memory buffer
54 xfs_bmbt_rec_host_t rec
;
57 for (i
= 0; i
< nrecs
; i
++) {
58 xfs_bmbt_rec_host_t
*ep
= xfs_iext_get_ext(ifp
, i
);
59 rec
.l0
= get_unaligned(&ep
->l0
);
60 rec
.l1
= get_unaligned(&ep
->l1
);
61 xfs_bmbt_get_all(&rec
, &irec
);
62 if (fmt
== XFS_EXTFMT_NOSTATE
)
63 ASSERT(irec
.br_state
== XFS_EXT_NORM
);
67 #define xfs_validate_extents(ifp, nrecs, fmt)
72 * Move inode type and inode format specific information from the
73 * on-disk inode to the in-core inode. For fifos, devs, and sockets
74 * this means set if_rdev to the proper value. For files, directories,
75 * and symlinks this means to bring in the in-line data or extent
76 * pointers. For a file in B-tree format, only the root is immediately
77 * brought in-core. The rest will be in-lined in if_extents when it
78 * is first referenced (see xfs_iread_extents()).
85 xfs_attr_shortform_t
*atp
;
90 if (unlikely(be32_to_cpu(dip
->di_nextents
) +
91 be16_to_cpu(dip
->di_anextents
) >
92 be64_to_cpu(dip
->di_nblocks
))) {
94 "corrupt dinode %Lu, extent total = %d, nblocks = %Lu.",
95 (unsigned long long)ip
->i_ino
,
96 (int)(be32_to_cpu(dip
->di_nextents
) +
97 be16_to_cpu(dip
->di_anextents
)),
99 be64_to_cpu(dip
->di_nblocks
));
100 XFS_CORRUPTION_ERROR("xfs_iformat(1)", XFS_ERRLEVEL_LOW
,
102 return -EFSCORRUPTED
;
105 if (unlikely(dip
->di_forkoff
> ip
->i_mount
->m_sb
.sb_inodesize
)) {
106 xfs_warn(ip
->i_mount
, "corrupt dinode %Lu, forkoff = 0x%x.",
107 (unsigned long long)ip
->i_ino
,
109 XFS_CORRUPTION_ERROR("xfs_iformat(2)", XFS_ERRLEVEL_LOW
,
111 return -EFSCORRUPTED
;
114 if (unlikely((ip
->i_d
.di_flags
& XFS_DIFLAG_REALTIME
) &&
115 !ip
->i_mount
->m_rtdev_targp
)) {
116 xfs_warn(ip
->i_mount
,
117 "corrupt dinode %Lu, has realtime flag set.",
119 XFS_CORRUPTION_ERROR("xfs_iformat(realtime)",
120 XFS_ERRLEVEL_LOW
, ip
->i_mount
, dip
);
121 return -EFSCORRUPTED
;
124 if (unlikely(xfs_is_reflink_inode(ip
) &&
125 (VFS_I(ip
)->i_mode
& S_IFMT
) != S_IFREG
)) {
126 xfs_warn(ip
->i_mount
,
127 "corrupt dinode %llu, wrong file type for reflink.",
129 XFS_CORRUPTION_ERROR("xfs_iformat(reflink)",
130 XFS_ERRLEVEL_LOW
, ip
->i_mount
, dip
);
131 return -EFSCORRUPTED
;
134 if (unlikely(xfs_is_reflink_inode(ip
) &&
135 (ip
->i_d
.di_flags
& XFS_DIFLAG_REALTIME
))) {
136 xfs_warn(ip
->i_mount
,
137 "corrupt dinode %llu, has reflink+realtime flag set.",
139 XFS_CORRUPTION_ERROR("xfs_iformat(reflink)",
140 XFS_ERRLEVEL_LOW
, ip
->i_mount
, dip
);
141 return -EFSCORRUPTED
;
144 switch (VFS_I(ip
)->i_mode
& S_IFMT
) {
149 if (unlikely(dip
->di_format
!= XFS_DINODE_FMT_DEV
)) {
150 XFS_CORRUPTION_ERROR("xfs_iformat(3)", XFS_ERRLEVEL_LOW
,
152 return -EFSCORRUPTED
;
155 ip
->i_df
.if_u2
.if_rdev
= xfs_dinode_get_rdev(dip
);
161 switch (dip
->di_format
) {
162 case XFS_DINODE_FMT_LOCAL
:
164 * no local regular files yet
166 if (unlikely(S_ISREG(be16_to_cpu(dip
->di_mode
)))) {
167 xfs_warn(ip
->i_mount
,
168 "corrupt inode %Lu (local format for regular file).",
169 (unsigned long long) ip
->i_ino
);
170 XFS_CORRUPTION_ERROR("xfs_iformat(4)",
173 return -EFSCORRUPTED
;
176 di_size
= be64_to_cpu(dip
->di_size
);
177 if (unlikely(di_size
< 0 ||
178 di_size
> XFS_DFORK_DSIZE(dip
, ip
->i_mount
))) {
179 xfs_warn(ip
->i_mount
,
180 "corrupt inode %Lu (bad size %Ld for local inode).",
181 (unsigned long long) ip
->i_ino
,
182 (long long) di_size
);
183 XFS_CORRUPTION_ERROR("xfs_iformat(5)",
186 return -EFSCORRUPTED
;
190 error
= xfs_iformat_local(ip
, dip
, XFS_DATA_FORK
, size
);
192 case XFS_DINODE_FMT_EXTENTS
:
193 error
= xfs_iformat_extents(ip
, dip
, XFS_DATA_FORK
);
195 case XFS_DINODE_FMT_BTREE
:
196 error
= xfs_iformat_btree(ip
, dip
, XFS_DATA_FORK
);
199 XFS_ERROR_REPORT("xfs_iformat(6)", XFS_ERRLEVEL_LOW
,
201 return -EFSCORRUPTED
;
206 XFS_ERROR_REPORT("xfs_iformat(7)", XFS_ERRLEVEL_LOW
, ip
->i_mount
);
207 return -EFSCORRUPTED
;
212 if (xfs_is_reflink_inode(ip
)) {
213 ASSERT(ip
->i_cowfp
== NULL
);
214 xfs_ifork_init_cow(ip
);
217 if (!XFS_DFORK_Q(dip
))
220 ASSERT(ip
->i_afp
== NULL
);
221 ip
->i_afp
= kmem_zone_zalloc(xfs_ifork_zone
, KM_SLEEP
| KM_NOFS
);
223 switch (dip
->di_aformat
) {
224 case XFS_DINODE_FMT_LOCAL
:
225 atp
= (xfs_attr_shortform_t
*)XFS_DFORK_APTR(dip
);
226 size
= be16_to_cpu(atp
->hdr
.totsize
);
228 if (unlikely(size
< sizeof(struct xfs_attr_sf_hdr
))) {
229 xfs_warn(ip
->i_mount
,
230 "corrupt inode %Lu (bad attr fork size %Ld).",
231 (unsigned long long) ip
->i_ino
,
233 XFS_CORRUPTION_ERROR("xfs_iformat(8)",
236 error
= -EFSCORRUPTED
;
240 error
= xfs_iformat_local(ip
, dip
, XFS_ATTR_FORK
, size
);
242 case XFS_DINODE_FMT_EXTENTS
:
243 error
= xfs_iformat_extents(ip
, dip
, XFS_ATTR_FORK
);
245 case XFS_DINODE_FMT_BTREE
:
246 error
= xfs_iformat_btree(ip
, dip
, XFS_ATTR_FORK
);
249 error
= -EFSCORRUPTED
;
253 kmem_zone_free(xfs_ifork_zone
, ip
->i_afp
);
256 kmem_zone_free(xfs_ifork_zone
, ip
->i_cowfp
);
258 xfs_idestroy_fork(ip
, XFS_DATA_FORK
);
265 struct xfs_inode
*ip
,
270 struct xfs_ifork
*ifp
= XFS_IFORK_PTR(ip
, whichfork
);
271 int mem_size
= size
, real_size
= 0;
275 * If we are using the local fork to store a symlink body we need to
276 * zero-terminate it so that we can pass it back to the VFS directly.
277 * Overallocate the in-memory fork by one for that and add a zero
278 * to terminate it below.
280 zero_terminate
= S_ISLNK(VFS_I(ip
)->i_mode
);
285 ifp
->if_u1
.if_data
= NULL
;
286 else if (mem_size
<= sizeof(ifp
->if_u2
.if_inline_data
))
287 ifp
->if_u1
.if_data
= ifp
->if_u2
.if_inline_data
;
289 real_size
= roundup(mem_size
, 4);
290 ifp
->if_u1
.if_data
= kmem_alloc(real_size
, KM_SLEEP
| KM_NOFS
);
294 memcpy(ifp
->if_u1
.if_data
, data
, size
);
296 ifp
->if_u1
.if_data
[size
] = '\0';
299 ifp
->if_bytes
= size
;
300 ifp
->if_real_bytes
= real_size
;
301 ifp
->if_flags
&= ~(XFS_IFEXTENTS
| XFS_IFBROOT
);
302 ifp
->if_flags
|= XFS_IFINLINE
;
306 * The file is in-lined in the on-disk inode.
307 * If it fits into if_inline_data, then copy
308 * it there, otherwise allocate a buffer for it
309 * and copy the data there. Either way, set
310 * if_data to point at the data.
311 * If we allocate a buffer for the data, make
312 * sure that its size is a multiple of 4 and
313 * record the real size in i_real_bytes.
324 * If the size is unreasonable, then something
325 * is wrong and we just bail out rather than crash in
326 * kmem_alloc() or memcpy() below.
328 if (unlikely(size
> XFS_DFORK_SIZE(dip
, ip
->i_mount
, whichfork
))) {
329 xfs_warn(ip
->i_mount
,
330 "corrupt inode %Lu (bad size %d for local fork, size = %d).",
331 (unsigned long long) ip
->i_ino
, size
,
332 XFS_DFORK_SIZE(dip
, ip
->i_mount
, whichfork
));
333 XFS_CORRUPTION_ERROR("xfs_iformat_local", XFS_ERRLEVEL_LOW
,
335 return -EFSCORRUPTED
;
338 xfs_init_local_fork(ip
, whichfork
, XFS_DFORK_PTR(dip
, whichfork
), size
);
343 * The file consists of a set of extents all
344 * of which fit into the on-disk inode.
345 * If there are few enough extents to fit into
346 * the if_inline_ext, then copy them there.
347 * Otherwise allocate a buffer for them and copy
348 * them into it. Either way, set if_extents
349 * to point at the extents.
363 ifp
= XFS_IFORK_PTR(ip
, whichfork
);
364 nex
= XFS_DFORK_NEXTENTS(dip
, whichfork
);
365 size
= nex
* (uint
)sizeof(xfs_bmbt_rec_t
);
368 * If the number of extents is unreasonable, then something
369 * is wrong and we just bail out rather than crash in
370 * kmem_alloc() or memcpy() below.
372 if (unlikely(size
< 0 || size
> XFS_DFORK_SIZE(dip
, ip
->i_mount
, whichfork
))) {
373 xfs_warn(ip
->i_mount
, "corrupt inode %Lu ((a)extents = %d).",
374 (unsigned long long) ip
->i_ino
, nex
);
375 XFS_CORRUPTION_ERROR("xfs_iformat_extents(1)", XFS_ERRLEVEL_LOW
,
377 return -EFSCORRUPTED
;
380 ifp
->if_real_bytes
= 0;
382 ifp
->if_u1
.if_extents
= NULL
;
383 else if (nex
<= XFS_INLINE_EXTS
)
384 ifp
->if_u1
.if_extents
= ifp
->if_u2
.if_inline_ext
;
386 xfs_iext_add(ifp
, 0, nex
);
388 ifp
->if_bytes
= size
;
390 dp
= (xfs_bmbt_rec_t
*) XFS_DFORK_PTR(dip
, whichfork
);
391 xfs_validate_extents(ifp
, nex
, XFS_EXTFMT_INODE(ip
));
392 for (i
= 0; i
< nex
; i
++, dp
++) {
393 xfs_bmbt_rec_host_t
*ep
= xfs_iext_get_ext(ifp
, i
);
394 ep
->l0
= get_unaligned_be64(&dp
->l0
);
395 ep
->l1
= get_unaligned_be64(&dp
->l1
);
397 XFS_BMAP_TRACE_EXLIST(ip
, nex
, whichfork
);
398 if (whichfork
!= XFS_DATA_FORK
||
399 XFS_EXTFMT_INODE(ip
) == XFS_EXTFMT_NOSTATE
)
400 if (unlikely(xfs_check_nostate_extents(
402 XFS_ERROR_REPORT("xfs_iformat_extents(2)",
405 return -EFSCORRUPTED
;
408 ifp
->if_flags
|= XFS_IFEXTENTS
;
413 * The file has too many extents to fit into
414 * the inode, so they are in B-tree format.
415 * Allocate a buffer for the root of the B-tree
416 * and copy the root into it. The i_extents
417 * field will remain NULL until all of the
418 * extents are read in (when they are needed).
426 struct xfs_mount
*mp
= ip
->i_mount
;
427 xfs_bmdr_block_t
*dfp
;
433 ifp
= XFS_IFORK_PTR(ip
, whichfork
);
434 dfp
= (xfs_bmdr_block_t
*)XFS_DFORK_PTR(dip
, whichfork
);
435 size
= XFS_BMAP_BROOT_SPACE(mp
, dfp
);
436 nrecs
= be16_to_cpu(dfp
->bb_numrecs
);
439 * blow out if -- fork has less extents than can fit in
440 * fork (fork shouldn't be a btree format), root btree
441 * block has more records than can fit into the fork,
442 * or the number of extents is greater than the number of
445 if (unlikely(XFS_IFORK_NEXTENTS(ip
, whichfork
) <=
446 XFS_IFORK_MAXEXT(ip
, whichfork
) ||
447 XFS_BMDR_SPACE_CALC(nrecs
) >
448 XFS_DFORK_SIZE(dip
, mp
, whichfork
) ||
449 XFS_IFORK_NEXTENTS(ip
, whichfork
) > ip
->i_d
.di_nblocks
)) {
450 xfs_warn(mp
, "corrupt inode %Lu (btree).",
451 (unsigned long long) ip
->i_ino
);
452 XFS_CORRUPTION_ERROR("xfs_iformat_btree", XFS_ERRLEVEL_LOW
,
454 return -EFSCORRUPTED
;
457 ifp
->if_broot_bytes
= size
;
458 ifp
->if_broot
= kmem_alloc(size
, KM_SLEEP
| KM_NOFS
);
459 ASSERT(ifp
->if_broot
!= NULL
);
461 * Copy and convert from the on-disk structure
462 * to the in-memory structure.
464 xfs_bmdr_to_bmbt(ip
, dfp
, XFS_DFORK_SIZE(dip
, ip
->i_mount
, whichfork
),
465 ifp
->if_broot
, size
);
466 ifp
->if_flags
&= ~XFS_IFEXTENTS
;
467 ifp
->if_flags
|= XFS_IFBROOT
;
473 * Read in extents from a btree-format inode.
474 * Allocate and fill in if_extents. Real work is done in xfs_bmap.c.
484 xfs_extnum_t nextents
;
486 ASSERT(xfs_isilocked(ip
, XFS_ILOCK_EXCL
));
488 if (unlikely(XFS_IFORK_FORMAT(ip
, whichfork
) != XFS_DINODE_FMT_BTREE
)) {
489 XFS_ERROR_REPORT("xfs_iread_extents", XFS_ERRLEVEL_LOW
,
491 return -EFSCORRUPTED
;
493 nextents
= XFS_IFORK_NEXTENTS(ip
, whichfork
);
494 ifp
= XFS_IFORK_PTR(ip
, whichfork
);
497 * We know that the size is valid (it's checked in iformat_btree)
499 ifp
->if_bytes
= ifp
->if_real_bytes
= 0;
500 ifp
->if_flags
|= XFS_IFEXTENTS
;
501 xfs_iext_add(ifp
, 0, nextents
);
502 error
= xfs_bmap_read_extents(tp
, ip
, whichfork
);
504 xfs_iext_destroy(ifp
);
505 ifp
->if_flags
&= ~XFS_IFEXTENTS
;
508 xfs_validate_extents(ifp
, nextents
, XFS_EXTFMT_INODE(ip
));
512 * Reallocate the space for if_broot based on the number of records
513 * being added or deleted as indicated in rec_diff. Move the records
514 * and pointers in if_broot to fit the new size. When shrinking this
515 * will eliminate holes between the records and pointers created by
516 * the caller. When growing this will create holes to be filled in
519 * The caller must not request to add more records than would fit in
520 * the on-disk inode root. If the if_broot is currently NULL, then
521 * if we are adding records, one will be allocated. The caller must also
522 * not request that the number of records go below zero, although
525 * ip -- the inode whose if_broot area is changing
526 * ext_diff -- the change in the number of records, positive or negative,
527 * requested for the if_broot array.
535 struct xfs_mount
*mp
= ip
->i_mount
;
538 struct xfs_btree_block
*new_broot
;
545 * Handle the degenerate case quietly.
551 ifp
= XFS_IFORK_PTR(ip
, whichfork
);
554 * If there wasn't any memory allocated before, just
555 * allocate it now and get out.
557 if (ifp
->if_broot_bytes
== 0) {
558 new_size
= XFS_BMAP_BROOT_SPACE_CALC(mp
, rec_diff
);
559 ifp
->if_broot
= kmem_alloc(new_size
, KM_SLEEP
| KM_NOFS
);
560 ifp
->if_broot_bytes
= (int)new_size
;
565 * If there is already an existing if_broot, then we need
566 * to realloc() it and shift the pointers to their new
567 * location. The records don't change location because
568 * they are kept butted up against the btree block header.
570 cur_max
= xfs_bmbt_maxrecs(mp
, ifp
->if_broot_bytes
, 0);
571 new_max
= cur_max
+ rec_diff
;
572 new_size
= XFS_BMAP_BROOT_SPACE_CALC(mp
, new_max
);
573 ifp
->if_broot
= kmem_realloc(ifp
->if_broot
, new_size
,
575 op
= (char *)XFS_BMAP_BROOT_PTR_ADDR(mp
, ifp
->if_broot
, 1,
576 ifp
->if_broot_bytes
);
577 np
= (char *)XFS_BMAP_BROOT_PTR_ADDR(mp
, ifp
->if_broot
, 1,
579 ifp
->if_broot_bytes
= (int)new_size
;
580 ASSERT(XFS_BMAP_BMDR_SPACE(ifp
->if_broot
) <=
581 XFS_IFORK_SIZE(ip
, whichfork
));
582 memmove(np
, op
, cur_max
* (uint
)sizeof(xfs_fsblock_t
));
587 * rec_diff is less than 0. In this case, we are shrinking the
588 * if_broot buffer. It must already exist. If we go to zero
589 * records, just get rid of the root and clear the status bit.
591 ASSERT((ifp
->if_broot
!= NULL
) && (ifp
->if_broot_bytes
> 0));
592 cur_max
= xfs_bmbt_maxrecs(mp
, ifp
->if_broot_bytes
, 0);
593 new_max
= cur_max
+ rec_diff
;
594 ASSERT(new_max
>= 0);
596 new_size
= XFS_BMAP_BROOT_SPACE_CALC(mp
, new_max
);
600 new_broot
= kmem_alloc(new_size
, KM_SLEEP
| KM_NOFS
);
602 * First copy over the btree block header.
604 memcpy(new_broot
, ifp
->if_broot
,
605 XFS_BMBT_BLOCK_LEN(ip
->i_mount
));
608 ifp
->if_flags
&= ~XFS_IFBROOT
;
612 * Only copy the records and pointers if there are any.
616 * First copy the records.
618 op
= (char *)XFS_BMBT_REC_ADDR(mp
, ifp
->if_broot
, 1);
619 np
= (char *)XFS_BMBT_REC_ADDR(mp
, new_broot
, 1);
620 memcpy(np
, op
, new_max
* (uint
)sizeof(xfs_bmbt_rec_t
));
623 * Then copy the pointers.
625 op
= (char *)XFS_BMAP_BROOT_PTR_ADDR(mp
, ifp
->if_broot
, 1,
626 ifp
->if_broot_bytes
);
627 np
= (char *)XFS_BMAP_BROOT_PTR_ADDR(mp
, new_broot
, 1,
629 memcpy(np
, op
, new_max
* (uint
)sizeof(xfs_fsblock_t
));
631 kmem_free(ifp
->if_broot
);
632 ifp
->if_broot
= new_broot
;
633 ifp
->if_broot_bytes
= (int)new_size
;
635 ASSERT(XFS_BMAP_BMDR_SPACE(ifp
->if_broot
) <=
636 XFS_IFORK_SIZE(ip
, whichfork
));
642 * This is called when the amount of space needed for if_data
643 * is increased or decreased. The change in size is indicated by
644 * the number of bytes that need to be added or deleted in the
645 * byte_diff parameter.
647 * If the amount of space needed has decreased below the size of the
648 * inline buffer, then switch to using the inline buffer. Otherwise,
649 * use kmem_realloc() or kmem_alloc() to adjust the size of the buffer
652 * ip -- the inode whose if_data area is changing
653 * byte_diff -- the change in the number of bytes, positive or negative,
654 * requested for the if_data array.
666 if (byte_diff
== 0) {
670 ifp
= XFS_IFORK_PTR(ip
, whichfork
);
671 new_size
= (int)ifp
->if_bytes
+ byte_diff
;
672 ASSERT(new_size
>= 0);
675 if (ifp
->if_u1
.if_data
!= ifp
->if_u2
.if_inline_data
) {
676 kmem_free(ifp
->if_u1
.if_data
);
678 ifp
->if_u1
.if_data
= NULL
;
680 } else if (new_size
<= sizeof(ifp
->if_u2
.if_inline_data
)) {
682 * If the valid extents/data can fit in if_inline_ext/data,
683 * copy them from the malloc'd vector and free it.
685 if (ifp
->if_u1
.if_data
== NULL
) {
686 ifp
->if_u1
.if_data
= ifp
->if_u2
.if_inline_data
;
687 } else if (ifp
->if_u1
.if_data
!= ifp
->if_u2
.if_inline_data
) {
688 ASSERT(ifp
->if_real_bytes
!= 0);
689 memcpy(ifp
->if_u2
.if_inline_data
, ifp
->if_u1
.if_data
,
691 kmem_free(ifp
->if_u1
.if_data
);
692 ifp
->if_u1
.if_data
= ifp
->if_u2
.if_inline_data
;
697 * Stuck with malloc/realloc.
698 * For inline data, the underlying buffer must be
699 * a multiple of 4 bytes in size so that it can be
700 * logged and stay on word boundaries. We enforce
703 real_size
= roundup(new_size
, 4);
704 if (ifp
->if_u1
.if_data
== NULL
) {
705 ASSERT(ifp
->if_real_bytes
== 0);
706 ifp
->if_u1
.if_data
= kmem_alloc(real_size
,
708 } else if (ifp
->if_u1
.if_data
!= ifp
->if_u2
.if_inline_data
) {
710 * Only do the realloc if the underlying size
711 * is really changing.
713 if (ifp
->if_real_bytes
!= real_size
) {
715 kmem_realloc(ifp
->if_u1
.if_data
,
720 ASSERT(ifp
->if_real_bytes
== 0);
721 ifp
->if_u1
.if_data
= kmem_alloc(real_size
,
723 memcpy(ifp
->if_u1
.if_data
, ifp
->if_u2
.if_inline_data
,
727 ifp
->if_real_bytes
= real_size
;
728 ifp
->if_bytes
= new_size
;
729 ASSERT(ifp
->if_bytes
<= XFS_IFORK_SIZE(ip
, whichfork
));
739 ifp
= XFS_IFORK_PTR(ip
, whichfork
);
740 if (ifp
->if_broot
!= NULL
) {
741 kmem_free(ifp
->if_broot
);
742 ifp
->if_broot
= NULL
;
746 * If the format is local, then we can't have an extents
747 * array so just look for an inline data array. If we're
748 * not local then we may or may not have an extents list,
749 * so check and free it up if we do.
751 if (XFS_IFORK_FORMAT(ip
, whichfork
) == XFS_DINODE_FMT_LOCAL
) {
752 if ((ifp
->if_u1
.if_data
!= ifp
->if_u2
.if_inline_data
) &&
753 (ifp
->if_u1
.if_data
!= NULL
)) {
754 ASSERT(ifp
->if_real_bytes
!= 0);
755 kmem_free(ifp
->if_u1
.if_data
);
756 ifp
->if_u1
.if_data
= NULL
;
757 ifp
->if_real_bytes
= 0;
759 } else if ((ifp
->if_flags
& XFS_IFEXTENTS
) &&
760 ((ifp
->if_flags
& XFS_IFEXTIREC
) ||
761 ((ifp
->if_u1
.if_extents
!= NULL
) &&
762 (ifp
->if_u1
.if_extents
!= ifp
->if_u2
.if_inline_ext
)))) {
763 ASSERT(ifp
->if_real_bytes
!= 0);
764 xfs_iext_destroy(ifp
);
766 ASSERT(ifp
->if_u1
.if_extents
== NULL
||
767 ifp
->if_u1
.if_extents
== ifp
->if_u2
.if_inline_ext
);
768 ASSERT(ifp
->if_real_bytes
== 0);
769 if (whichfork
== XFS_ATTR_FORK
) {
770 kmem_zone_free(xfs_ifork_zone
, ip
->i_afp
);
772 } else if (whichfork
== XFS_COW_FORK
) {
773 kmem_zone_free(xfs_ifork_zone
, ip
->i_cowfp
);
778 /* Count number of incore extents based on if_bytes */
780 xfs_iext_count(struct xfs_ifork
*ifp
)
782 return ifp
->if_bytes
/ (uint
)sizeof(xfs_bmbt_rec_t
);
786 * Convert in-core extents to on-disk form
788 * For either the data or attr fork in extent format, we need to endian convert
789 * the in-core extent as we place them into the on-disk inode.
791 * In the case of the data fork, the in-core and on-disk fork sizes can be
792 * different due to delayed allocation extents. We only copy on-disk extents
793 * here, so callers must always use the physical fork size to determine the
794 * size of the buffer passed to this routine. We will return the size actually
807 xfs_fsblock_t start_block
;
809 ifp
= XFS_IFORK_PTR(ip
, whichfork
);
810 ASSERT(xfs_isilocked(ip
, XFS_ILOCK_EXCL
|XFS_ILOCK_SHARED
));
811 ASSERT(ifp
->if_bytes
> 0);
813 nrecs
= xfs_iext_count(ifp
);
814 XFS_BMAP_TRACE_EXLIST(ip
, nrecs
, whichfork
);
818 * There are some delayed allocation extents in the
819 * inode, so copy the extents one at a time and skip
820 * the delayed ones. There must be at least one
821 * non-delayed extent.
824 for (i
= 0; i
< nrecs
; i
++) {
825 xfs_bmbt_rec_host_t
*ep
= xfs_iext_get_ext(ifp
, i
);
826 start_block
= xfs_bmbt_get_startblock(ep
);
827 if (isnullstartblock(start_block
)) {
829 * It's a delayed allocation extent, so skip it.
834 /* Translate to on disk format */
835 put_unaligned_be64(ep
->l0
, &dp
->l0
);
836 put_unaligned_be64(ep
->l1
, &dp
->l1
);
841 xfs_validate_extents(ifp
, copied
, XFS_EXTFMT_INODE(ip
));
843 return (copied
* (uint
)sizeof(xfs_bmbt_rec_t
));
847 * Each of the following cases stores data into the same region
848 * of the on-disk inode, so only one of them can be valid at
849 * any given time. While it is possible to have conflicting formats
850 * and log flags, e.g. having XFS_ILOG_?DATA set when the fork is
851 * in EXTENTS format, this can only happen when the fork has
852 * changed formats after being modified but before being flushed.
853 * In these cases, the format always takes precedence, because the
854 * format indicates the current state of the fork.
860 xfs_inode_log_item_t
*iip
,
866 static const short brootflag
[2] =
867 { XFS_ILOG_DBROOT
, XFS_ILOG_ABROOT
};
868 static const short dataflag
[2] =
869 { XFS_ILOG_DDATA
, XFS_ILOG_ADATA
};
870 static const short extflag
[2] =
871 { XFS_ILOG_DEXT
, XFS_ILOG_AEXT
};
875 ifp
= XFS_IFORK_PTR(ip
, whichfork
);
877 * This can happen if we gave up in iformat in an error path,
878 * for the attribute fork.
881 ASSERT(whichfork
== XFS_ATTR_FORK
);
884 cp
= XFS_DFORK_PTR(dip
, whichfork
);
886 switch (XFS_IFORK_FORMAT(ip
, whichfork
)) {
887 case XFS_DINODE_FMT_LOCAL
:
888 if ((iip
->ili_fields
& dataflag
[whichfork
]) &&
889 (ifp
->if_bytes
> 0)) {
890 ASSERT(ifp
->if_u1
.if_data
!= NULL
);
891 ASSERT(ifp
->if_bytes
<= XFS_IFORK_SIZE(ip
, whichfork
));
892 memcpy(cp
, ifp
->if_u1
.if_data
, ifp
->if_bytes
);
896 case XFS_DINODE_FMT_EXTENTS
:
897 ASSERT((ifp
->if_flags
& XFS_IFEXTENTS
) ||
898 !(iip
->ili_fields
& extflag
[whichfork
]));
899 if ((iip
->ili_fields
& extflag
[whichfork
]) &&
900 (ifp
->if_bytes
> 0)) {
901 ASSERT(xfs_iext_get_ext(ifp
, 0));
902 ASSERT(XFS_IFORK_NEXTENTS(ip
, whichfork
) > 0);
903 (void)xfs_iextents_copy(ip
, (xfs_bmbt_rec_t
*)cp
,
908 case XFS_DINODE_FMT_BTREE
:
909 if ((iip
->ili_fields
& brootflag
[whichfork
]) &&
910 (ifp
->if_broot_bytes
> 0)) {
911 ASSERT(ifp
->if_broot
!= NULL
);
912 ASSERT(XFS_BMAP_BMDR_SPACE(ifp
->if_broot
) <=
913 XFS_IFORK_SIZE(ip
, whichfork
));
914 xfs_bmbt_to_bmdr(mp
, ifp
->if_broot
, ifp
->if_broot_bytes
,
915 (xfs_bmdr_block_t
*)cp
,
916 XFS_DFORK_SIZE(dip
, mp
, whichfork
));
920 case XFS_DINODE_FMT_DEV
:
921 if (iip
->ili_fields
& XFS_ILOG_DEV
) {
922 ASSERT(whichfork
== XFS_DATA_FORK
);
923 xfs_dinode_put_rdev(dip
, ip
->i_df
.if_u2
.if_rdev
);
927 case XFS_DINODE_FMT_UUID
:
928 if (iip
->ili_fields
& XFS_ILOG_UUID
) {
929 ASSERT(whichfork
== XFS_DATA_FORK
);
930 memcpy(XFS_DFORK_DPTR(dip
),
931 &ip
->i_df
.if_u2
.if_uuid
,
943 * Return a pointer to the extent record at file index idx.
945 xfs_bmbt_rec_host_t
*
947 xfs_ifork_t
*ifp
, /* inode fork pointer */
948 xfs_extnum_t idx
) /* index of target extent */
951 ASSERT(idx
< xfs_iext_count(ifp
));
953 if ((ifp
->if_flags
& XFS_IFEXTIREC
) && (idx
== 0)) {
954 return ifp
->if_u1
.if_ext_irec
->er_extbuf
;
955 } else if (ifp
->if_flags
& XFS_IFEXTIREC
) {
956 xfs_ext_irec_t
*erp
; /* irec pointer */
957 int erp_idx
= 0; /* irec index */
958 xfs_extnum_t page_idx
= idx
; /* ext index in target list */
960 erp
= xfs_iext_idx_to_irec(ifp
, &page_idx
, &erp_idx
, 0);
961 return &erp
->er_extbuf
[page_idx
];
962 } else if (ifp
->if_bytes
) {
963 return &ifp
->if_u1
.if_extents
[idx
];
969 /* Convert bmap state flags to an inode fork. */
971 xfs_iext_state_to_fork(
972 struct xfs_inode
*ip
,
975 if (state
& BMAP_COWFORK
)
977 else if (state
& BMAP_ATTRFORK
)
983 * Insert new item(s) into the extent records for incore inode
984 * fork 'ifp'. 'count' new items are inserted at index 'idx'.
988 xfs_inode_t
*ip
, /* incore inode pointer */
989 xfs_extnum_t idx
, /* starting index of new items */
990 xfs_extnum_t count
, /* number of inserted items */
991 xfs_bmbt_irec_t
*new, /* items to insert */
992 int state
) /* type of extent conversion */
994 xfs_ifork_t
*ifp
= xfs_iext_state_to_fork(ip
, state
);
995 xfs_extnum_t i
; /* extent record index */
997 trace_xfs_iext_insert(ip
, idx
, new, state
, _RET_IP_
);
999 ASSERT(ifp
->if_flags
& XFS_IFEXTENTS
);
1000 xfs_iext_add(ifp
, idx
, count
);
1001 for (i
= idx
; i
< idx
+ count
; i
++, new++)
1002 xfs_bmbt_set_all(xfs_iext_get_ext(ifp
, i
), new);
1006 * This is called when the amount of space required for incore file
1007 * extents needs to be increased. The ext_diff parameter stores the
1008 * number of new extents being added and the idx parameter contains
1009 * the extent index where the new extents will be added. If the new
1010 * extents are being appended, then we just need to (re)allocate and
1011 * initialize the space. Otherwise, if the new extents are being
1012 * inserted into the middle of the existing entries, a bit more work
1013 * is required to make room for the new extents to be inserted. The
1014 * caller is responsible for filling in the new extent entries upon
1019 xfs_ifork_t
*ifp
, /* inode fork pointer */
1020 xfs_extnum_t idx
, /* index to begin adding exts */
1021 int ext_diff
) /* number of extents to add */
1023 int byte_diff
; /* new bytes being added */
1024 int new_size
; /* size of extents after adding */
1025 xfs_extnum_t nextents
; /* number of extents in file */
1027 nextents
= xfs_iext_count(ifp
);
1028 ASSERT((idx
>= 0) && (idx
<= nextents
));
1029 byte_diff
= ext_diff
* sizeof(xfs_bmbt_rec_t
);
1030 new_size
= ifp
->if_bytes
+ byte_diff
;
1032 * If the new number of extents (nextents + ext_diff)
1033 * fits inside the inode, then continue to use the inline
1036 if (nextents
+ ext_diff
<= XFS_INLINE_EXTS
) {
1037 if (idx
< nextents
) {
1038 memmove(&ifp
->if_u2
.if_inline_ext
[idx
+ ext_diff
],
1039 &ifp
->if_u2
.if_inline_ext
[idx
],
1040 (nextents
- idx
) * sizeof(xfs_bmbt_rec_t
));
1041 memset(&ifp
->if_u2
.if_inline_ext
[idx
], 0, byte_diff
);
1043 ifp
->if_u1
.if_extents
= ifp
->if_u2
.if_inline_ext
;
1044 ifp
->if_real_bytes
= 0;
1047 * Otherwise use a linear (direct) extent list.
1048 * If the extents are currently inside the inode,
1049 * xfs_iext_realloc_direct will switch us from
1050 * inline to direct extent allocation mode.
1052 else if (nextents
+ ext_diff
<= XFS_LINEAR_EXTS
) {
1053 xfs_iext_realloc_direct(ifp
, new_size
);
1054 if (idx
< nextents
) {
1055 memmove(&ifp
->if_u1
.if_extents
[idx
+ ext_diff
],
1056 &ifp
->if_u1
.if_extents
[idx
],
1057 (nextents
- idx
) * sizeof(xfs_bmbt_rec_t
));
1058 memset(&ifp
->if_u1
.if_extents
[idx
], 0, byte_diff
);
1061 /* Indirection array */
1063 xfs_ext_irec_t
*erp
;
1067 ASSERT(nextents
+ ext_diff
> XFS_LINEAR_EXTS
);
1068 if (ifp
->if_flags
& XFS_IFEXTIREC
) {
1069 erp
= xfs_iext_idx_to_irec(ifp
, &page_idx
, &erp_idx
, 1);
1071 xfs_iext_irec_init(ifp
);
1072 ASSERT(ifp
->if_flags
& XFS_IFEXTIREC
);
1073 erp
= ifp
->if_u1
.if_ext_irec
;
1075 /* Extents fit in target extent page */
1076 if (erp
&& erp
->er_extcount
+ ext_diff
<= XFS_LINEAR_EXTS
) {
1077 if (page_idx
< erp
->er_extcount
) {
1078 memmove(&erp
->er_extbuf
[page_idx
+ ext_diff
],
1079 &erp
->er_extbuf
[page_idx
],
1080 (erp
->er_extcount
- page_idx
) *
1081 sizeof(xfs_bmbt_rec_t
));
1082 memset(&erp
->er_extbuf
[page_idx
], 0, byte_diff
);
1084 erp
->er_extcount
+= ext_diff
;
1085 xfs_iext_irec_update_extoffs(ifp
, erp_idx
+ 1, ext_diff
);
1087 /* Insert a new extent page */
1089 xfs_iext_add_indirect_multi(ifp
,
1090 erp_idx
, page_idx
, ext_diff
);
1093 * If extent(s) are being appended to the last page in
1094 * the indirection array and the new extent(s) don't fit
1095 * in the page, then erp is NULL and erp_idx is set to
1096 * the next index needed in the indirection array.
1099 uint count
= ext_diff
;
1102 erp
= xfs_iext_irec_new(ifp
, erp_idx
);
1103 erp
->er_extcount
= min(count
, XFS_LINEAR_EXTS
);
1104 count
-= erp
->er_extcount
;
1110 ifp
->if_bytes
= new_size
;
1114 * This is called when incore extents are being added to the indirection
1115 * array and the new extents do not fit in the target extent list. The
1116 * erp_idx parameter contains the irec index for the target extent list
1117 * in the indirection array, and the idx parameter contains the extent
1118 * index within the list. The number of extents being added is stored
1119 * in the count parameter.
1121 * |-------| |-------|
1122 * | | | | idx - number of extents before idx
1124 * | | | | count - number of extents being inserted at idx
1125 * |-------| |-------|
1126 * | count | | nex2 | nex2 - number of extents after idx + count
1127 * |-------| |-------|
1130 xfs_iext_add_indirect_multi(
1131 xfs_ifork_t
*ifp
, /* inode fork pointer */
1132 int erp_idx
, /* target extent irec index */
1133 xfs_extnum_t idx
, /* index within target list */
1134 int count
) /* new extents being added */
1136 int byte_diff
; /* new bytes being added */
1137 xfs_ext_irec_t
*erp
; /* pointer to irec entry */
1138 xfs_extnum_t ext_diff
; /* number of extents to add */
1139 xfs_extnum_t ext_cnt
; /* new extents still needed */
1140 xfs_extnum_t nex2
; /* extents after idx + count */
1141 xfs_bmbt_rec_t
*nex2_ep
= NULL
; /* temp list for nex2 extents */
1142 int nlists
; /* number of irec's (lists) */
1144 ASSERT(ifp
->if_flags
& XFS_IFEXTIREC
);
1145 erp
= &ifp
->if_u1
.if_ext_irec
[erp_idx
];
1146 nex2
= erp
->er_extcount
- idx
;
1147 nlists
= ifp
->if_real_bytes
/ XFS_IEXT_BUFSZ
;
1150 * Save second part of target extent list
1151 * (all extents past */
1153 byte_diff
= nex2
* sizeof(xfs_bmbt_rec_t
);
1154 nex2_ep
= (xfs_bmbt_rec_t
*) kmem_alloc(byte_diff
, KM_NOFS
);
1155 memmove(nex2_ep
, &erp
->er_extbuf
[idx
], byte_diff
);
1156 erp
->er_extcount
-= nex2
;
1157 xfs_iext_irec_update_extoffs(ifp
, erp_idx
+ 1, -nex2
);
1158 memset(&erp
->er_extbuf
[idx
], 0, byte_diff
);
1162 * Add the new extents to the end of the target
1163 * list, then allocate new irec record(s) and
1164 * extent buffer(s) as needed to store the rest
1165 * of the new extents.
1168 ext_diff
= MIN(ext_cnt
, (int)XFS_LINEAR_EXTS
- erp
->er_extcount
);
1170 erp
->er_extcount
+= ext_diff
;
1171 xfs_iext_irec_update_extoffs(ifp
, erp_idx
+ 1, ext_diff
);
1172 ext_cnt
-= ext_diff
;
1176 erp
= xfs_iext_irec_new(ifp
, erp_idx
);
1177 ext_diff
= MIN(ext_cnt
, (int)XFS_LINEAR_EXTS
);
1178 erp
->er_extcount
= ext_diff
;
1179 xfs_iext_irec_update_extoffs(ifp
, erp_idx
+ 1, ext_diff
);
1180 ext_cnt
-= ext_diff
;
1183 /* Add nex2 extents back to indirection array */
1185 xfs_extnum_t ext_avail
;
1188 byte_diff
= nex2
* sizeof(xfs_bmbt_rec_t
);
1189 ext_avail
= XFS_LINEAR_EXTS
- erp
->er_extcount
;
1192 * If nex2 extents fit in the current page, append
1193 * nex2_ep after the new extents.
1195 if (nex2
<= ext_avail
) {
1196 i
= erp
->er_extcount
;
1199 * Otherwise, check if space is available in the
1202 else if ((erp_idx
< nlists
- 1) &&
1203 (nex2
<= (ext_avail
= XFS_LINEAR_EXTS
-
1204 ifp
->if_u1
.if_ext_irec
[erp_idx
+1].er_extcount
))) {
1207 /* Create a hole for nex2 extents */
1208 memmove(&erp
->er_extbuf
[nex2
], erp
->er_extbuf
,
1209 erp
->er_extcount
* sizeof(xfs_bmbt_rec_t
));
1212 * Final choice, create a new extent page for
1217 erp
= xfs_iext_irec_new(ifp
, erp_idx
);
1219 memmove(&erp
->er_extbuf
[i
], nex2_ep
, byte_diff
);
1221 erp
->er_extcount
+= nex2
;
1222 xfs_iext_irec_update_extoffs(ifp
, erp_idx
+ 1, nex2
);
1227 * This is called when the amount of space required for incore file
1228 * extents needs to be decreased. The ext_diff parameter stores the
1229 * number of extents to be removed and the idx parameter contains
1230 * the extent index where the extents will be removed from.
1232 * If the amount of space needed has decreased below the linear
1233 * limit, XFS_IEXT_BUFSZ, then switch to using the contiguous
1234 * extent array. Otherwise, use kmem_realloc() to adjust the
1235 * size to what is needed.
1239 xfs_inode_t
*ip
, /* incore inode pointer */
1240 xfs_extnum_t idx
, /* index to begin removing exts */
1241 int ext_diff
, /* number of extents to remove */
1242 int state
) /* type of extent conversion */
1244 xfs_ifork_t
*ifp
= xfs_iext_state_to_fork(ip
, state
);
1245 xfs_extnum_t nextents
; /* number of extents in file */
1246 int new_size
; /* size of extents after removal */
1248 trace_xfs_iext_remove(ip
, idx
, state
, _RET_IP_
);
1250 ASSERT(ext_diff
> 0);
1251 nextents
= xfs_iext_count(ifp
);
1252 new_size
= (nextents
- ext_diff
) * sizeof(xfs_bmbt_rec_t
);
1254 if (new_size
== 0) {
1255 xfs_iext_destroy(ifp
);
1256 } else if (ifp
->if_flags
& XFS_IFEXTIREC
) {
1257 xfs_iext_remove_indirect(ifp
, idx
, ext_diff
);
1258 } else if (ifp
->if_real_bytes
) {
1259 xfs_iext_remove_direct(ifp
, idx
, ext_diff
);
1261 xfs_iext_remove_inline(ifp
, idx
, ext_diff
);
1263 ifp
->if_bytes
= new_size
;
1267 * This removes ext_diff extents from the inline buffer, beginning
1268 * at extent index idx.
1271 xfs_iext_remove_inline(
1272 xfs_ifork_t
*ifp
, /* inode fork pointer */
1273 xfs_extnum_t idx
, /* index to begin removing exts */
1274 int ext_diff
) /* number of extents to remove */
1276 int nextents
; /* number of extents in file */
1278 ASSERT(!(ifp
->if_flags
& XFS_IFEXTIREC
));
1279 ASSERT(idx
< XFS_INLINE_EXTS
);
1280 nextents
= xfs_iext_count(ifp
);
1281 ASSERT(((nextents
- ext_diff
) > 0) &&
1282 (nextents
- ext_diff
) < XFS_INLINE_EXTS
);
1284 if (idx
+ ext_diff
< nextents
) {
1285 memmove(&ifp
->if_u2
.if_inline_ext
[idx
],
1286 &ifp
->if_u2
.if_inline_ext
[idx
+ ext_diff
],
1287 (nextents
- (idx
+ ext_diff
)) *
1288 sizeof(xfs_bmbt_rec_t
));
1289 memset(&ifp
->if_u2
.if_inline_ext
[nextents
- ext_diff
],
1290 0, ext_diff
* sizeof(xfs_bmbt_rec_t
));
1292 memset(&ifp
->if_u2
.if_inline_ext
[idx
], 0,
1293 ext_diff
* sizeof(xfs_bmbt_rec_t
));
1298 * This removes ext_diff extents from a linear (direct) extent list,
1299 * beginning at extent index idx. If the extents are being removed
1300 * from the end of the list (ie. truncate) then we just need to re-
1301 * allocate the list to remove the extra space. Otherwise, if the
1302 * extents are being removed from the middle of the existing extent
1303 * entries, then we first need to move the extent records beginning
1304 * at idx + ext_diff up in the list to overwrite the records being
1305 * removed, then remove the extra space via kmem_realloc.
1308 xfs_iext_remove_direct(
1309 xfs_ifork_t
*ifp
, /* inode fork pointer */
1310 xfs_extnum_t idx
, /* index to begin removing exts */
1311 int ext_diff
) /* number of extents to remove */
1313 xfs_extnum_t nextents
; /* number of extents in file */
1314 int new_size
; /* size of extents after removal */
1316 ASSERT(!(ifp
->if_flags
& XFS_IFEXTIREC
));
1317 new_size
= ifp
->if_bytes
-
1318 (ext_diff
* sizeof(xfs_bmbt_rec_t
));
1319 nextents
= xfs_iext_count(ifp
);
1321 if (new_size
== 0) {
1322 xfs_iext_destroy(ifp
);
1325 /* Move extents up in the list (if needed) */
1326 if (idx
+ ext_diff
< nextents
) {
1327 memmove(&ifp
->if_u1
.if_extents
[idx
],
1328 &ifp
->if_u1
.if_extents
[idx
+ ext_diff
],
1329 (nextents
- (idx
+ ext_diff
)) *
1330 sizeof(xfs_bmbt_rec_t
));
1332 memset(&ifp
->if_u1
.if_extents
[nextents
- ext_diff
],
1333 0, ext_diff
* sizeof(xfs_bmbt_rec_t
));
1335 * Reallocate the direct extent list. If the extents
1336 * will fit inside the inode then xfs_iext_realloc_direct
1337 * will switch from direct to inline extent allocation
1340 xfs_iext_realloc_direct(ifp
, new_size
);
1341 ifp
->if_bytes
= new_size
;
1345 * This is called when incore extents are being removed from the
1346 * indirection array and the extents being removed span multiple extent
1347 * buffers. The idx parameter contains the file extent index where we
1348 * want to begin removing extents, and the count parameter contains
1349 * how many extents need to be removed.
1351 * |-------| |-------|
1352 * | nex1 | | | nex1 - number of extents before idx
1353 * |-------| | count |
1354 * | | | | count - number of extents being removed at idx
1355 * | count | |-------|
1356 * | | | nex2 | nex2 - number of extents after idx + count
1357 * |-------| |-------|
1360 xfs_iext_remove_indirect(
1361 xfs_ifork_t
*ifp
, /* inode fork pointer */
1362 xfs_extnum_t idx
, /* index to begin removing extents */
1363 int count
) /* number of extents to remove */
1365 xfs_ext_irec_t
*erp
; /* indirection array pointer */
1366 int erp_idx
= 0; /* indirection array index */
1367 xfs_extnum_t ext_cnt
; /* extents left to remove */
1368 xfs_extnum_t ext_diff
; /* extents to remove in current list */
1369 xfs_extnum_t nex1
; /* number of extents before idx */
1370 xfs_extnum_t nex2
; /* extents after idx + count */
1371 int page_idx
= idx
; /* index in target extent list */
1373 ASSERT(ifp
->if_flags
& XFS_IFEXTIREC
);
1374 erp
= xfs_iext_idx_to_irec(ifp
, &page_idx
, &erp_idx
, 0);
1375 ASSERT(erp
!= NULL
);
1379 nex2
= MAX((erp
->er_extcount
- (nex1
+ ext_cnt
)), 0);
1380 ext_diff
= MIN(ext_cnt
, (erp
->er_extcount
- nex1
));
1382 * Check for deletion of entire list;
1383 * xfs_iext_irec_remove() updates extent offsets.
1385 if (ext_diff
== erp
->er_extcount
) {
1386 xfs_iext_irec_remove(ifp
, erp_idx
);
1387 ext_cnt
-= ext_diff
;
1390 ASSERT(erp_idx
< ifp
->if_real_bytes
/
1392 erp
= &ifp
->if_u1
.if_ext_irec
[erp_idx
];
1399 /* Move extents up (if needed) */
1401 memmove(&erp
->er_extbuf
[nex1
],
1402 &erp
->er_extbuf
[nex1
+ ext_diff
],
1403 nex2
* sizeof(xfs_bmbt_rec_t
));
1405 /* Zero out rest of page */
1406 memset(&erp
->er_extbuf
[nex1
+ nex2
], 0, (XFS_IEXT_BUFSZ
-
1407 ((nex1
+ nex2
) * sizeof(xfs_bmbt_rec_t
))));
1408 /* Update remaining counters */
1409 erp
->er_extcount
-= ext_diff
;
1410 xfs_iext_irec_update_extoffs(ifp
, erp_idx
+ 1, -ext_diff
);
1411 ext_cnt
-= ext_diff
;
1416 ifp
->if_bytes
-= count
* sizeof(xfs_bmbt_rec_t
);
1417 xfs_iext_irec_compact(ifp
);
1421 * Create, destroy, or resize a linear (direct) block of extents.
1424 xfs_iext_realloc_direct(
1425 xfs_ifork_t
*ifp
, /* inode fork pointer */
1426 int new_size
) /* new size of extents after adding */
1428 int rnew_size
; /* real new size of extents */
1430 rnew_size
= new_size
;
1432 ASSERT(!(ifp
->if_flags
& XFS_IFEXTIREC
) ||
1433 ((new_size
>= 0) && (new_size
<= XFS_IEXT_BUFSZ
) &&
1434 (new_size
!= ifp
->if_real_bytes
)));
1436 /* Free extent records */
1437 if (new_size
== 0) {
1438 xfs_iext_destroy(ifp
);
1440 /* Resize direct extent list and zero any new bytes */
1441 else if (ifp
->if_real_bytes
) {
1442 /* Check if extents will fit inside the inode */
1443 if (new_size
<= XFS_INLINE_EXTS
* sizeof(xfs_bmbt_rec_t
)) {
1444 xfs_iext_direct_to_inline(ifp
, new_size
/
1445 (uint
)sizeof(xfs_bmbt_rec_t
));
1446 ifp
->if_bytes
= new_size
;
1449 if (!is_power_of_2(new_size
)){
1450 rnew_size
= roundup_pow_of_two(new_size
);
1452 if (rnew_size
!= ifp
->if_real_bytes
) {
1453 ifp
->if_u1
.if_extents
=
1454 kmem_realloc(ifp
->if_u1
.if_extents
,
1455 rnew_size
, KM_NOFS
);
1457 if (rnew_size
> ifp
->if_real_bytes
) {
1458 memset(&ifp
->if_u1
.if_extents
[ifp
->if_bytes
/
1459 (uint
)sizeof(xfs_bmbt_rec_t
)], 0,
1460 rnew_size
- ifp
->if_real_bytes
);
1463 /* Switch from the inline extent buffer to a direct extent list */
1465 if (!is_power_of_2(new_size
)) {
1466 rnew_size
= roundup_pow_of_two(new_size
);
1468 xfs_iext_inline_to_direct(ifp
, rnew_size
);
1470 ifp
->if_real_bytes
= rnew_size
;
1471 ifp
->if_bytes
= new_size
;
1475 * Switch from linear (direct) extent records to inline buffer.
1478 xfs_iext_direct_to_inline(
1479 xfs_ifork_t
*ifp
, /* inode fork pointer */
1480 xfs_extnum_t nextents
) /* number of extents in file */
1482 ASSERT(ifp
->if_flags
& XFS_IFEXTENTS
);
1483 ASSERT(nextents
<= XFS_INLINE_EXTS
);
1485 * The inline buffer was zeroed when we switched
1486 * from inline to direct extent allocation mode,
1487 * so we don't need to clear it here.
1489 memcpy(ifp
->if_u2
.if_inline_ext
, ifp
->if_u1
.if_extents
,
1490 nextents
* sizeof(xfs_bmbt_rec_t
));
1491 kmem_free(ifp
->if_u1
.if_extents
);
1492 ifp
->if_u1
.if_extents
= ifp
->if_u2
.if_inline_ext
;
1493 ifp
->if_real_bytes
= 0;
1497 * Switch from inline buffer to linear (direct) extent records.
1498 * new_size should already be rounded up to the next power of 2
1499 * by the caller (when appropriate), so use new_size as it is.
1500 * However, since new_size may be rounded up, we can't update
1501 * if_bytes here. It is the caller's responsibility to update
1502 * if_bytes upon return.
1505 xfs_iext_inline_to_direct(
1506 xfs_ifork_t
*ifp
, /* inode fork pointer */
1507 int new_size
) /* number of extents in file */
1509 ifp
->if_u1
.if_extents
= kmem_alloc(new_size
, KM_NOFS
);
1510 memset(ifp
->if_u1
.if_extents
, 0, new_size
);
1511 if (ifp
->if_bytes
) {
1512 memcpy(ifp
->if_u1
.if_extents
, ifp
->if_u2
.if_inline_ext
,
1514 memset(ifp
->if_u2
.if_inline_ext
, 0, XFS_INLINE_EXTS
*
1515 sizeof(xfs_bmbt_rec_t
));
1517 ifp
->if_real_bytes
= new_size
;
1521 * Resize an extent indirection array to new_size bytes.
1524 xfs_iext_realloc_indirect(
1525 xfs_ifork_t
*ifp
, /* inode fork pointer */
1526 int new_size
) /* new indirection array size */
1528 int nlists
; /* number of irec's (ex lists) */
1529 int size
; /* current indirection array size */
1531 ASSERT(ifp
->if_flags
& XFS_IFEXTIREC
);
1532 nlists
= ifp
->if_real_bytes
/ XFS_IEXT_BUFSZ
;
1533 size
= nlists
* sizeof(xfs_ext_irec_t
);
1534 ASSERT(ifp
->if_real_bytes
);
1535 ASSERT((new_size
>= 0) && (new_size
!= size
));
1536 if (new_size
== 0) {
1537 xfs_iext_destroy(ifp
);
1539 ifp
->if_u1
.if_ext_irec
=
1540 kmem_realloc(ifp
->if_u1
.if_ext_irec
, new_size
, KM_NOFS
);
1545 * Switch from indirection array to linear (direct) extent allocations.
1548 xfs_iext_indirect_to_direct(
1549 xfs_ifork_t
*ifp
) /* inode fork pointer */
1551 xfs_bmbt_rec_host_t
*ep
; /* extent record pointer */
1552 xfs_extnum_t nextents
; /* number of extents in file */
1553 int size
; /* size of file extents */
1555 ASSERT(ifp
->if_flags
& XFS_IFEXTIREC
);
1556 nextents
= xfs_iext_count(ifp
);
1557 ASSERT(nextents
<= XFS_LINEAR_EXTS
);
1558 size
= nextents
* sizeof(xfs_bmbt_rec_t
);
1560 xfs_iext_irec_compact_pages(ifp
);
1561 ASSERT(ifp
->if_real_bytes
== XFS_IEXT_BUFSZ
);
1563 ep
= ifp
->if_u1
.if_ext_irec
->er_extbuf
;
1564 kmem_free(ifp
->if_u1
.if_ext_irec
);
1565 ifp
->if_flags
&= ~XFS_IFEXTIREC
;
1566 ifp
->if_u1
.if_extents
= ep
;
1567 ifp
->if_bytes
= size
;
1568 if (nextents
< XFS_LINEAR_EXTS
) {
1569 xfs_iext_realloc_direct(ifp
, size
);
1574 * Remove all records from the indirection array.
1577 xfs_iext_irec_remove_all(
1578 struct xfs_ifork
*ifp
)
1583 ASSERT(ifp
->if_flags
& XFS_IFEXTIREC
);
1584 nlists
= ifp
->if_real_bytes
/ XFS_IEXT_BUFSZ
;
1585 for (i
= 0; i
< nlists
; i
++)
1586 kmem_free(ifp
->if_u1
.if_ext_irec
[i
].er_extbuf
);
1587 kmem_free(ifp
->if_u1
.if_ext_irec
);
1588 ifp
->if_flags
&= ~XFS_IFEXTIREC
;
1592 * Free incore file extents.
1596 xfs_ifork_t
*ifp
) /* inode fork pointer */
1598 if (ifp
->if_flags
& XFS_IFEXTIREC
) {
1599 xfs_iext_irec_remove_all(ifp
);
1600 } else if (ifp
->if_real_bytes
) {
1601 kmem_free(ifp
->if_u1
.if_extents
);
1602 } else if (ifp
->if_bytes
) {
1603 memset(ifp
->if_u2
.if_inline_ext
, 0, XFS_INLINE_EXTS
*
1604 sizeof(xfs_bmbt_rec_t
));
1606 ifp
->if_u1
.if_extents
= NULL
;
1607 ifp
->if_real_bytes
= 0;
1612 * Return a pointer to the extent record for file system block bno.
1614 xfs_bmbt_rec_host_t
* /* pointer to found extent record */
1615 xfs_iext_bno_to_ext(
1616 xfs_ifork_t
*ifp
, /* inode fork pointer */
1617 xfs_fileoff_t bno
, /* block number to search for */
1618 xfs_extnum_t
*idxp
) /* index of target extent */
1620 xfs_bmbt_rec_host_t
*base
; /* pointer to first extent */
1621 xfs_filblks_t blockcount
= 0; /* number of blocks in extent */
1622 xfs_bmbt_rec_host_t
*ep
= NULL
; /* pointer to target extent */
1623 xfs_ext_irec_t
*erp
= NULL
; /* indirection array pointer */
1624 int high
; /* upper boundary in search */
1625 xfs_extnum_t idx
= 0; /* index of target extent */
1626 int low
; /* lower boundary in search */
1627 xfs_extnum_t nextents
; /* number of file extents */
1628 xfs_fileoff_t startoff
= 0; /* start offset of extent */
1630 nextents
= xfs_iext_count(ifp
);
1631 if (nextents
== 0) {
1636 if (ifp
->if_flags
& XFS_IFEXTIREC
) {
1637 /* Find target extent list */
1639 erp
= xfs_iext_bno_to_irec(ifp
, bno
, &erp_idx
);
1640 base
= erp
->er_extbuf
;
1641 high
= erp
->er_extcount
- 1;
1643 base
= ifp
->if_u1
.if_extents
;
1644 high
= nextents
- 1;
1646 /* Binary search extent records */
1647 while (low
<= high
) {
1648 idx
= (low
+ high
) >> 1;
1650 startoff
= xfs_bmbt_get_startoff(ep
);
1651 blockcount
= xfs_bmbt_get_blockcount(ep
);
1652 if (bno
< startoff
) {
1654 } else if (bno
>= startoff
+ blockcount
) {
1657 /* Convert back to file-based extent index */
1658 if (ifp
->if_flags
& XFS_IFEXTIREC
) {
1659 idx
+= erp
->er_extoff
;
1665 /* Convert back to file-based extent index */
1666 if (ifp
->if_flags
& XFS_IFEXTIREC
) {
1667 idx
+= erp
->er_extoff
;
1669 if (bno
>= startoff
+ blockcount
) {
1670 if (++idx
== nextents
) {
1673 ep
= xfs_iext_get_ext(ifp
, idx
);
1681 * Return a pointer to the indirection array entry containing the
1682 * extent record for filesystem block bno. Store the index of the
1683 * target irec in *erp_idxp.
1685 xfs_ext_irec_t
* /* pointer to found extent record */
1686 xfs_iext_bno_to_irec(
1687 xfs_ifork_t
*ifp
, /* inode fork pointer */
1688 xfs_fileoff_t bno
, /* block number to search for */
1689 int *erp_idxp
) /* irec index of target ext list */
1691 xfs_ext_irec_t
*erp
= NULL
; /* indirection array pointer */
1692 xfs_ext_irec_t
*erp_next
; /* next indirection array entry */
1693 int erp_idx
; /* indirection array index */
1694 int nlists
; /* number of extent irec's (lists) */
1695 int high
; /* binary search upper limit */
1696 int low
; /* binary search lower limit */
1698 ASSERT(ifp
->if_flags
& XFS_IFEXTIREC
);
1699 nlists
= ifp
->if_real_bytes
/ XFS_IEXT_BUFSZ
;
1703 while (low
<= high
) {
1704 erp_idx
= (low
+ high
) >> 1;
1705 erp
= &ifp
->if_u1
.if_ext_irec
[erp_idx
];
1706 erp_next
= erp_idx
< nlists
- 1 ? erp
+ 1 : NULL
;
1707 if (bno
< xfs_bmbt_get_startoff(erp
->er_extbuf
)) {
1709 } else if (erp_next
&& bno
>=
1710 xfs_bmbt_get_startoff(erp_next
->er_extbuf
)) {
1716 *erp_idxp
= erp_idx
;
1721 * Return a pointer to the indirection array entry containing the
1722 * extent record at file extent index *idxp. Store the index of the
1723 * target irec in *erp_idxp and store the page index of the target
1724 * extent record in *idxp.
1727 xfs_iext_idx_to_irec(
1728 xfs_ifork_t
*ifp
, /* inode fork pointer */
1729 xfs_extnum_t
*idxp
, /* extent index (file -> page) */
1730 int *erp_idxp
, /* pointer to target irec */
1731 int realloc
) /* new bytes were just added */
1733 xfs_ext_irec_t
*prev
; /* pointer to previous irec */
1734 xfs_ext_irec_t
*erp
= NULL
; /* pointer to current irec */
1735 int erp_idx
; /* indirection array index */
1736 int nlists
; /* number of irec's (ex lists) */
1737 int high
; /* binary search upper limit */
1738 int low
; /* binary search lower limit */
1739 xfs_extnum_t page_idx
= *idxp
; /* extent index in target list */
1741 ASSERT(ifp
->if_flags
& XFS_IFEXTIREC
);
1742 ASSERT(page_idx
>= 0);
1743 ASSERT(page_idx
<= xfs_iext_count(ifp
));
1744 ASSERT(page_idx
< xfs_iext_count(ifp
) || realloc
);
1746 nlists
= ifp
->if_real_bytes
/ XFS_IEXT_BUFSZ
;
1751 /* Binary search extent irec's */
1752 while (low
<= high
) {
1753 erp_idx
= (low
+ high
) >> 1;
1754 erp
= &ifp
->if_u1
.if_ext_irec
[erp_idx
];
1755 prev
= erp_idx
> 0 ? erp
- 1 : NULL
;
1756 if (page_idx
< erp
->er_extoff
|| (page_idx
== erp
->er_extoff
&&
1757 realloc
&& prev
&& prev
->er_extcount
< XFS_LINEAR_EXTS
)) {
1759 } else if (page_idx
> erp
->er_extoff
+ erp
->er_extcount
||
1760 (page_idx
== erp
->er_extoff
+ erp
->er_extcount
&&
1763 } else if (page_idx
== erp
->er_extoff
+ erp
->er_extcount
&&
1764 erp
->er_extcount
== XFS_LINEAR_EXTS
) {
1768 erp
= erp_idx
< nlists
? erp
+ 1 : NULL
;
1771 page_idx
-= erp
->er_extoff
;
1776 *erp_idxp
= erp_idx
;
1781 * Allocate and initialize an indirection array once the space needed
1782 * for incore extents increases above XFS_IEXT_BUFSZ.
1786 xfs_ifork_t
*ifp
) /* inode fork pointer */
1788 xfs_ext_irec_t
*erp
; /* indirection array pointer */
1789 xfs_extnum_t nextents
; /* number of extents in file */
1791 ASSERT(!(ifp
->if_flags
& XFS_IFEXTIREC
));
1792 nextents
= xfs_iext_count(ifp
);
1793 ASSERT(nextents
<= XFS_LINEAR_EXTS
);
1795 erp
= kmem_alloc(sizeof(xfs_ext_irec_t
), KM_NOFS
);
1797 if (nextents
== 0) {
1798 ifp
->if_u1
.if_extents
= kmem_alloc(XFS_IEXT_BUFSZ
, KM_NOFS
);
1799 } else if (!ifp
->if_real_bytes
) {
1800 xfs_iext_inline_to_direct(ifp
, XFS_IEXT_BUFSZ
);
1801 } else if (ifp
->if_real_bytes
< XFS_IEXT_BUFSZ
) {
1802 xfs_iext_realloc_direct(ifp
, XFS_IEXT_BUFSZ
);
1804 erp
->er_extbuf
= ifp
->if_u1
.if_extents
;
1805 erp
->er_extcount
= nextents
;
1808 ifp
->if_flags
|= XFS_IFEXTIREC
;
1809 ifp
->if_real_bytes
= XFS_IEXT_BUFSZ
;
1810 ifp
->if_bytes
= nextents
* sizeof(xfs_bmbt_rec_t
);
1811 ifp
->if_u1
.if_ext_irec
= erp
;
1817 * Allocate and initialize a new entry in the indirection array.
1821 xfs_ifork_t
*ifp
, /* inode fork pointer */
1822 int erp_idx
) /* index for new irec */
1824 xfs_ext_irec_t
*erp
; /* indirection array pointer */
1825 int i
; /* loop counter */
1826 int nlists
; /* number of irec's (ex lists) */
1828 ASSERT(ifp
->if_flags
& XFS_IFEXTIREC
);
1829 nlists
= ifp
->if_real_bytes
/ XFS_IEXT_BUFSZ
;
1831 /* Resize indirection array */
1832 xfs_iext_realloc_indirect(ifp
, ++nlists
*
1833 sizeof(xfs_ext_irec_t
));
1835 * Move records down in the array so the
1836 * new page can use erp_idx.
1838 erp
= ifp
->if_u1
.if_ext_irec
;
1839 for (i
= nlists
- 1; i
> erp_idx
; i
--) {
1840 memmove(&erp
[i
], &erp
[i
-1], sizeof(xfs_ext_irec_t
));
1842 ASSERT(i
== erp_idx
);
1844 /* Initialize new extent record */
1845 erp
= ifp
->if_u1
.if_ext_irec
;
1846 erp
[erp_idx
].er_extbuf
= kmem_alloc(XFS_IEXT_BUFSZ
, KM_NOFS
);
1847 ifp
->if_real_bytes
= nlists
* XFS_IEXT_BUFSZ
;
1848 memset(erp
[erp_idx
].er_extbuf
, 0, XFS_IEXT_BUFSZ
);
1849 erp
[erp_idx
].er_extcount
= 0;
1850 erp
[erp_idx
].er_extoff
= erp_idx
> 0 ?
1851 erp
[erp_idx
-1].er_extoff
+ erp
[erp_idx
-1].er_extcount
: 0;
1852 return (&erp
[erp_idx
]);
1856 * Remove a record from the indirection array.
1859 xfs_iext_irec_remove(
1860 xfs_ifork_t
*ifp
, /* inode fork pointer */
1861 int erp_idx
) /* irec index to remove */
1863 xfs_ext_irec_t
*erp
; /* indirection array pointer */
1864 int i
; /* loop counter */
1865 int nlists
; /* number of irec's (ex lists) */
1867 ASSERT(ifp
->if_flags
& XFS_IFEXTIREC
);
1868 nlists
= ifp
->if_real_bytes
/ XFS_IEXT_BUFSZ
;
1869 erp
= &ifp
->if_u1
.if_ext_irec
[erp_idx
];
1870 if (erp
->er_extbuf
) {
1871 xfs_iext_irec_update_extoffs(ifp
, erp_idx
+ 1,
1873 kmem_free(erp
->er_extbuf
);
1875 /* Compact extent records */
1876 erp
= ifp
->if_u1
.if_ext_irec
;
1877 for (i
= erp_idx
; i
< nlists
- 1; i
++) {
1878 memmove(&erp
[i
], &erp
[i
+1], sizeof(xfs_ext_irec_t
));
1881 * Manually free the last extent record from the indirection
1882 * array. A call to xfs_iext_realloc_indirect() with a size
1883 * of zero would result in a call to xfs_iext_destroy() which
1884 * would in turn call this function again, creating a nasty
1888 xfs_iext_realloc_indirect(ifp
,
1889 nlists
* sizeof(xfs_ext_irec_t
));
1891 kmem_free(ifp
->if_u1
.if_ext_irec
);
1893 ifp
->if_real_bytes
= nlists
* XFS_IEXT_BUFSZ
;
1897 * This is called to clean up large amounts of unused memory allocated
1898 * by the indirection array. Before compacting anything though, verify
1899 * that the indirection array is still needed and switch back to the
1900 * linear extent list (or even the inline buffer) if possible. The
1901 * compaction policy is as follows:
1903 * Full Compaction: Extents fit into a single page (or inline buffer)
1904 * Partial Compaction: Extents occupy less than 50% of allocated space
1905 * No Compaction: Extents occupy at least 50% of allocated space
1908 xfs_iext_irec_compact(
1909 xfs_ifork_t
*ifp
) /* inode fork pointer */
1911 xfs_extnum_t nextents
; /* number of extents in file */
1912 int nlists
; /* number of irec's (ex lists) */
1914 ASSERT(ifp
->if_flags
& XFS_IFEXTIREC
);
1915 nlists
= ifp
->if_real_bytes
/ XFS_IEXT_BUFSZ
;
1916 nextents
= xfs_iext_count(ifp
);
1918 if (nextents
== 0) {
1919 xfs_iext_destroy(ifp
);
1920 } else if (nextents
<= XFS_INLINE_EXTS
) {
1921 xfs_iext_indirect_to_direct(ifp
);
1922 xfs_iext_direct_to_inline(ifp
, nextents
);
1923 } else if (nextents
<= XFS_LINEAR_EXTS
) {
1924 xfs_iext_indirect_to_direct(ifp
);
1925 } else if (nextents
< (nlists
* XFS_LINEAR_EXTS
) >> 1) {
1926 xfs_iext_irec_compact_pages(ifp
);
1931 * Combine extents from neighboring extent pages.
1934 xfs_iext_irec_compact_pages(
1935 xfs_ifork_t
*ifp
) /* inode fork pointer */
1937 xfs_ext_irec_t
*erp
, *erp_next
;/* pointers to irec entries */
1938 int erp_idx
= 0; /* indirection array index */
1939 int nlists
; /* number of irec's (ex lists) */
1941 ASSERT(ifp
->if_flags
& XFS_IFEXTIREC
);
1942 nlists
= ifp
->if_real_bytes
/ XFS_IEXT_BUFSZ
;
1943 while (erp_idx
< nlists
- 1) {
1944 erp
= &ifp
->if_u1
.if_ext_irec
[erp_idx
];
1946 if (erp_next
->er_extcount
<=
1947 (XFS_LINEAR_EXTS
- erp
->er_extcount
)) {
1948 memcpy(&erp
->er_extbuf
[erp
->er_extcount
],
1949 erp_next
->er_extbuf
, erp_next
->er_extcount
*
1950 sizeof(xfs_bmbt_rec_t
));
1951 erp
->er_extcount
+= erp_next
->er_extcount
;
1953 * Free page before removing extent record
1954 * so er_extoffs don't get modified in
1955 * xfs_iext_irec_remove.
1957 kmem_free(erp_next
->er_extbuf
);
1958 erp_next
->er_extbuf
= NULL
;
1959 xfs_iext_irec_remove(ifp
, erp_idx
+ 1);
1960 nlists
= ifp
->if_real_bytes
/ XFS_IEXT_BUFSZ
;
1968 * This is called to update the er_extoff field in the indirection
1969 * array when extents have been added or removed from one of the
1970 * extent lists. erp_idx contains the irec index to begin updating
1971 * at and ext_diff contains the number of extents that were added
1975 xfs_iext_irec_update_extoffs(
1976 xfs_ifork_t
*ifp
, /* inode fork pointer */
1977 int erp_idx
, /* irec index to update */
1978 int ext_diff
) /* number of new extents */
1980 int i
; /* loop counter */
1981 int nlists
; /* number of irec's (ex lists */
1983 ASSERT(ifp
->if_flags
& XFS_IFEXTIREC
);
1984 nlists
= ifp
->if_real_bytes
/ XFS_IEXT_BUFSZ
;
1985 for (i
= erp_idx
; i
< nlists
; i
++) {
1986 ifp
->if_u1
.if_ext_irec
[i
].er_extoff
+= ext_diff
;
1991 * Initialize an inode's copy-on-write fork.
1995 struct xfs_inode
*ip
)
2000 ip
->i_cowfp
= kmem_zone_zalloc(xfs_ifork_zone
,
2001 KM_SLEEP
| KM_NOFS
);
2002 ip
->i_cowfp
->if_flags
= XFS_IFEXTENTS
;
2003 ip
->i_cformat
= XFS_DINODE_FMT_EXTENTS
;
2004 ip
->i_cnextents
= 0;
2008 * Lookup the extent covering bno.
2010 * If there is an extent covering bno return the extent index, and store the
2011 * expanded extent structure in *gotp, and the extent index in *idx.
2012 * If there is no extent covering bno, but there is an extent after it (e.g.
2013 * it lies in a hole) return that extent in *gotp and its index in *idx
2015 * If bno is beyond the last extent return false, and return the index after
2016 * the last valid index in *idxp.
2019 xfs_iext_lookup_extent(
2020 struct xfs_inode
*ip
,
2021 struct xfs_ifork
*ifp
,
2024 struct xfs_bmbt_irec
*gotp
)
2026 struct xfs_bmbt_rec_host
*ep
;
2028 XFS_STATS_INC(ip
->i_mount
, xs_look_exlist
);
2030 ep
= xfs_iext_bno_to_ext(ifp
, bno
, idxp
);
2033 xfs_bmbt_get_all(ep
, gotp
);
2038 * Return true if there is an extent at index idx, and return the expanded
2039 * extent structure at idx in that case. Else return false.
2042 xfs_iext_get_extent(
2043 struct xfs_ifork
*ifp
,
2045 struct xfs_bmbt_irec
*gotp
)
2047 if (idx
< 0 || idx
>= xfs_iext_count(ifp
))
2049 xfs_bmbt_get_all(xfs_iext_get_ext(ifp
, idx
), gotp
);