1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
4 * Copyright (c) 2013 Red Hat, Inc.
7 #include "libxfs_priv.h"
9 #include "xfs_shared.h"
10 #include "xfs_format.h"
11 #include "xfs_log_format.h"
12 #include "xfs_trans_resv.h"
15 #include "xfs_mount.h"
16 #include "xfs_da_format.h"
17 #include "xfs_da_btree.h"
18 #include "xfs_inode.h"
19 #include "xfs_trans.h"
20 #include "xfs_bmap_btree.h"
22 #include "xfs_attr_sf.h"
23 #include "xfs_attr_remote.h"
24 #include "xfs_attr_leaf.h"
25 #include "xfs_trace.h"
26 #include "xfs_cksum.h"
33 * Routines to implement leaf blocks of attributes as Btrees of hashed names.
36 /*========================================================================
37 * Function prototypes for the kernel.
38 *========================================================================*/
41 * Routines used for growing the Btree.
43 STATIC
int xfs_attr3_leaf_create(struct xfs_da_args
*args
,
44 xfs_dablk_t which_block
, struct xfs_buf
**bpp
);
45 STATIC
int xfs_attr3_leaf_add_work(struct xfs_buf
*leaf_buffer
,
46 struct xfs_attr3_icleaf_hdr
*ichdr
,
47 struct xfs_da_args
*args
, int freemap_index
);
48 STATIC
void xfs_attr3_leaf_compact(struct xfs_da_args
*args
,
49 struct xfs_attr3_icleaf_hdr
*ichdr
,
50 struct xfs_buf
*leaf_buffer
);
51 STATIC
void xfs_attr3_leaf_rebalance(xfs_da_state_t
*state
,
52 xfs_da_state_blk_t
*blk1
,
53 xfs_da_state_blk_t
*blk2
);
54 STATIC
int xfs_attr3_leaf_figure_balance(xfs_da_state_t
*state
,
55 xfs_da_state_blk_t
*leaf_blk_1
,
56 struct xfs_attr3_icleaf_hdr
*ichdr1
,
57 xfs_da_state_blk_t
*leaf_blk_2
,
58 struct xfs_attr3_icleaf_hdr
*ichdr2
,
59 int *number_entries_in_blk1
,
60 int *number_usedbytes_in_blk1
);
65 STATIC
void xfs_attr3_leaf_moveents(struct xfs_da_args
*args
,
66 struct xfs_attr_leafblock
*src_leaf
,
67 struct xfs_attr3_icleaf_hdr
*src_ichdr
, int src_start
,
68 struct xfs_attr_leafblock
*dst_leaf
,
69 struct xfs_attr3_icleaf_hdr
*dst_ichdr
, int dst_start
,
71 STATIC
int xfs_attr_leaf_entsize(xfs_attr_leafblock_t
*leaf
, int index
);
74 * attr3 block 'firstused' conversion helpers.
76 * firstused refers to the offset of the first used byte of the nameval region
77 * of an attr leaf block. The region starts at the tail of the block and expands
78 * backwards towards the middle. As such, firstused is initialized to the block
79 * size for an empty leaf block and is reduced from there.
81 * The attr3 block size is pegged to the fsb size and the maximum fsb is 64k.
82 * The in-core firstused field is 32-bit and thus supports the maximum fsb size.
83 * The on-disk field is only 16-bit, however, and overflows at 64k. Since this
84 * only occurs at exactly 64k, we use zero as a magic on-disk value to represent
85 * the attr block size. The following helpers manage the conversion between the
86 * in-core and on-disk formats.
90 xfs_attr3_leaf_firstused_from_disk(
91 struct xfs_da_geometry
*geo
,
92 struct xfs_attr3_icleaf_hdr
*to
,
93 struct xfs_attr_leafblock
*from
)
95 struct xfs_attr3_leaf_hdr
*hdr3
;
97 if (from
->hdr
.info
.magic
== cpu_to_be16(XFS_ATTR3_LEAF_MAGIC
)) {
98 hdr3
= (struct xfs_attr3_leaf_hdr
*) from
;
99 to
->firstused
= be16_to_cpu(hdr3
->firstused
);
101 to
->firstused
= be16_to_cpu(from
->hdr
.firstused
);
105 * Convert from the magic fsb size value to actual blocksize. This
106 * should only occur for empty blocks when the block size overflows
109 if (to
->firstused
== XFS_ATTR3_LEAF_NULLOFF
) {
110 ASSERT(!to
->count
&& !to
->usedbytes
);
111 ASSERT(geo
->blksize
> USHRT_MAX
);
112 to
->firstused
= geo
->blksize
;
117 xfs_attr3_leaf_firstused_to_disk(
118 struct xfs_da_geometry
*geo
,
119 struct xfs_attr_leafblock
*to
,
120 struct xfs_attr3_icleaf_hdr
*from
)
122 struct xfs_attr3_leaf_hdr
*hdr3
;
125 /* magic value should only be seen on disk */
126 ASSERT(from
->firstused
!= XFS_ATTR3_LEAF_NULLOFF
);
129 * Scale down the 32-bit in-core firstused value to the 16-bit on-disk
130 * value. This only overflows at the max supported value of 64k. Use the
131 * magic on-disk value to represent block size in this case.
133 firstused
= from
->firstused
;
134 if (firstused
> USHRT_MAX
) {
135 ASSERT(from
->firstused
== geo
->blksize
);
136 firstused
= XFS_ATTR3_LEAF_NULLOFF
;
139 if (from
->magic
== XFS_ATTR3_LEAF_MAGIC
) {
140 hdr3
= (struct xfs_attr3_leaf_hdr
*) to
;
141 hdr3
->firstused
= cpu_to_be16(firstused
);
143 to
->hdr
.firstused
= cpu_to_be16(firstused
);
148 xfs_attr3_leaf_hdr_from_disk(
149 struct xfs_da_geometry
*geo
,
150 struct xfs_attr3_icleaf_hdr
*to
,
151 struct xfs_attr_leafblock
*from
)
155 ASSERT(from
->hdr
.info
.magic
== cpu_to_be16(XFS_ATTR_LEAF_MAGIC
) ||
156 from
->hdr
.info
.magic
== cpu_to_be16(XFS_ATTR3_LEAF_MAGIC
));
158 if (from
->hdr
.info
.magic
== cpu_to_be16(XFS_ATTR3_LEAF_MAGIC
)) {
159 struct xfs_attr3_leaf_hdr
*hdr3
= (struct xfs_attr3_leaf_hdr
*)from
;
161 to
->forw
= be32_to_cpu(hdr3
->info
.hdr
.forw
);
162 to
->back
= be32_to_cpu(hdr3
->info
.hdr
.back
);
163 to
->magic
= be16_to_cpu(hdr3
->info
.hdr
.magic
);
164 to
->count
= be16_to_cpu(hdr3
->count
);
165 to
->usedbytes
= be16_to_cpu(hdr3
->usedbytes
);
166 xfs_attr3_leaf_firstused_from_disk(geo
, to
, from
);
167 to
->holes
= hdr3
->holes
;
169 for (i
= 0; i
< XFS_ATTR_LEAF_MAPSIZE
; i
++) {
170 to
->freemap
[i
].base
= be16_to_cpu(hdr3
->freemap
[i
].base
);
171 to
->freemap
[i
].size
= be16_to_cpu(hdr3
->freemap
[i
].size
);
175 to
->forw
= be32_to_cpu(from
->hdr
.info
.forw
);
176 to
->back
= be32_to_cpu(from
->hdr
.info
.back
);
177 to
->magic
= be16_to_cpu(from
->hdr
.info
.magic
);
178 to
->count
= be16_to_cpu(from
->hdr
.count
);
179 to
->usedbytes
= be16_to_cpu(from
->hdr
.usedbytes
);
180 xfs_attr3_leaf_firstused_from_disk(geo
, to
, from
);
181 to
->holes
= from
->hdr
.holes
;
183 for (i
= 0; i
< XFS_ATTR_LEAF_MAPSIZE
; i
++) {
184 to
->freemap
[i
].base
= be16_to_cpu(from
->hdr
.freemap
[i
].base
);
185 to
->freemap
[i
].size
= be16_to_cpu(from
->hdr
.freemap
[i
].size
);
190 xfs_attr3_leaf_hdr_to_disk(
191 struct xfs_da_geometry
*geo
,
192 struct xfs_attr_leafblock
*to
,
193 struct xfs_attr3_icleaf_hdr
*from
)
197 ASSERT(from
->magic
== XFS_ATTR_LEAF_MAGIC
||
198 from
->magic
== XFS_ATTR3_LEAF_MAGIC
);
200 if (from
->magic
== XFS_ATTR3_LEAF_MAGIC
) {
201 struct xfs_attr3_leaf_hdr
*hdr3
= (struct xfs_attr3_leaf_hdr
*)to
;
203 hdr3
->info
.hdr
.forw
= cpu_to_be32(from
->forw
);
204 hdr3
->info
.hdr
.back
= cpu_to_be32(from
->back
);
205 hdr3
->info
.hdr
.magic
= cpu_to_be16(from
->magic
);
206 hdr3
->count
= cpu_to_be16(from
->count
);
207 hdr3
->usedbytes
= cpu_to_be16(from
->usedbytes
);
208 xfs_attr3_leaf_firstused_to_disk(geo
, to
, from
);
209 hdr3
->holes
= from
->holes
;
212 for (i
= 0; i
< XFS_ATTR_LEAF_MAPSIZE
; i
++) {
213 hdr3
->freemap
[i
].base
= cpu_to_be16(from
->freemap
[i
].base
);
214 hdr3
->freemap
[i
].size
= cpu_to_be16(from
->freemap
[i
].size
);
218 to
->hdr
.info
.forw
= cpu_to_be32(from
->forw
);
219 to
->hdr
.info
.back
= cpu_to_be32(from
->back
);
220 to
->hdr
.info
.magic
= cpu_to_be16(from
->magic
);
221 to
->hdr
.count
= cpu_to_be16(from
->count
);
222 to
->hdr
.usedbytes
= cpu_to_be16(from
->usedbytes
);
223 xfs_attr3_leaf_firstused_to_disk(geo
, to
, from
);
224 to
->hdr
.holes
= from
->holes
;
227 for (i
= 0; i
< XFS_ATTR_LEAF_MAPSIZE
; i
++) {
228 to
->hdr
.freemap
[i
].base
= cpu_to_be16(from
->freemap
[i
].base
);
229 to
->hdr
.freemap
[i
].size
= cpu_to_be16(from
->freemap
[i
].size
);
233 static xfs_failaddr_t
234 xfs_attr3_leaf_verify(
237 struct xfs_attr3_icleaf_hdr ichdr
;
238 struct xfs_mount
*mp
= bp
->b_target
->bt_mount
;
239 struct xfs_attr_leafblock
*leaf
= bp
->b_addr
;
240 struct xfs_perag
*pag
= bp
->b_pag
;
241 struct xfs_attr_leaf_entry
*entries
;
243 xfs_attr3_leaf_hdr_from_disk(mp
->m_attr_geo
, &ichdr
, leaf
);
245 if (xfs_sb_version_hascrc(&mp
->m_sb
)) {
246 struct xfs_da3_node_hdr
*hdr3
= bp
->b_addr
;
248 if (ichdr
.magic
!= XFS_ATTR3_LEAF_MAGIC
)
249 return __this_address
;
251 if (!uuid_equal(&hdr3
->info
.uuid
, &mp
->m_sb
.sb_meta_uuid
))
252 return __this_address
;
253 if (be64_to_cpu(hdr3
->info
.blkno
) != bp
->b_bn
)
254 return __this_address
;
255 if (!xfs_log_check_lsn(mp
, be64_to_cpu(hdr3
->info
.lsn
)))
256 return __this_address
;
258 if (ichdr
.magic
!= XFS_ATTR_LEAF_MAGIC
)
259 return __this_address
;
262 * In recovery there is a transient state where count == 0 is valid
263 * because we may have transitioned an empty shortform attr to a leaf
264 * if the attr didn't fit in shortform.
266 if (pag
&& pag
->pagf_init
&& ichdr
.count
== 0)
267 return __this_address
;
270 * firstused is the block offset of the first name info structure.
271 * Make sure it doesn't go off the block or crash into the header.
273 if (ichdr
.firstused
> mp
->m_attr_geo
->blksize
)
274 return __this_address
;
275 if (ichdr
.firstused
< xfs_attr3_leaf_hdr_size(leaf
))
276 return __this_address
;
278 /* Make sure the entries array doesn't crash into the name info. */
279 entries
= xfs_attr3_leaf_entryp(bp
->b_addr
);
280 if ((char *)&entries
[ichdr
.count
] >
281 (char *)bp
->b_addr
+ ichdr
.firstused
)
282 return __this_address
;
284 /* XXX: need to range check rest of attr header values */
285 /* XXX: hash order check? */
291 xfs_attr3_leaf_write_verify(
294 struct xfs_mount
*mp
= bp
->b_target
->bt_mount
;
295 struct xfs_buf_log_item
*bip
= bp
->b_log_item
;
296 struct xfs_attr3_leaf_hdr
*hdr3
= bp
->b_addr
;
299 fa
= xfs_attr3_leaf_verify(bp
);
301 xfs_verifier_error(bp
, -EFSCORRUPTED
, fa
);
305 if (!xfs_sb_version_hascrc(&mp
->m_sb
))
309 hdr3
->info
.lsn
= cpu_to_be64(bip
->bli_item
.li_lsn
);
311 xfs_buf_update_cksum(bp
, XFS_ATTR3_LEAF_CRC_OFF
);
315 * leaf/node format detection on trees is sketchy, so a node read can be done on
316 * leaf level blocks when detection identifies the tree as a node format tree
317 * incorrectly. In this case, we need to swap the verifier to match the correct
318 * format of the block being read.
321 xfs_attr3_leaf_read_verify(
324 struct xfs_mount
*mp
= bp
->b_target
->bt_mount
;
327 if (xfs_sb_version_hascrc(&mp
->m_sb
) &&
328 !xfs_buf_verify_cksum(bp
, XFS_ATTR3_LEAF_CRC_OFF
))
329 xfs_verifier_error(bp
, -EFSBADCRC
, __this_address
);
331 fa
= xfs_attr3_leaf_verify(bp
);
333 xfs_verifier_error(bp
, -EFSCORRUPTED
, fa
);
337 const struct xfs_buf_ops xfs_attr3_leaf_buf_ops
= {
338 .name
= "xfs_attr3_leaf",
339 .verify_read
= xfs_attr3_leaf_read_verify
,
340 .verify_write
= xfs_attr3_leaf_write_verify
,
341 .verify_struct
= xfs_attr3_leaf_verify
,
346 struct xfs_trans
*tp
,
347 struct xfs_inode
*dp
,
349 xfs_daddr_t mappedbno
,
350 struct xfs_buf
**bpp
)
354 err
= xfs_da_read_buf(tp
, dp
, bno
, mappedbno
, bpp
,
355 XFS_ATTR_FORK
, &xfs_attr3_leaf_buf_ops
);
356 if (!err
&& tp
&& *bpp
)
357 xfs_trans_buf_set_type(tp
, *bpp
, XFS_BLFT_ATTR_LEAF_BUF
);
361 /*========================================================================
362 * Namespace helper routines
363 *========================================================================*/
366 * If namespace bits don't match return 0.
367 * If all match then return 1.
370 xfs_attr_namesp_match(int arg_flags
, int ondisk_flags
)
372 return XFS_ATTR_NSP_ONDISK(ondisk_flags
) == XFS_ATTR_NSP_ARGS_TO_ONDISK(arg_flags
);
376 /*========================================================================
377 * External routines when attribute fork size < XFS_LITINO(mp).
378 *========================================================================*/
381 * Query whether the requested number of additional bytes of extended
382 * attribute space will be able to fit inline.
384 * Returns zero if not, else the di_forkoff fork offset to be used in the
385 * literal area for attribute data once the new bytes have been added.
387 * di_forkoff must be 8 byte aligned, hence is stored as a >>3 value;
388 * special case for dev/uuid inodes, they have fixed size data forks.
391 xfs_attr_shortform_bytesfit(xfs_inode_t
*dp
, int bytes
)
394 int minforkoff
; /* lower limit on valid forkoff locations */
395 int maxforkoff
; /* upper limit on valid forkoff locations */
397 xfs_mount_t
*mp
= dp
->i_mount
;
400 offset
= (XFS_LITINO(mp
, dp
->i_d
.di_version
) - bytes
) >> 3;
402 if (dp
->i_d
.di_format
== XFS_DINODE_FMT_DEV
) {
403 minforkoff
= roundup(sizeof(xfs_dev_t
), 8) >> 3;
404 return (offset
>= minforkoff
) ? minforkoff
: 0;
408 * If the requested numbers of bytes is smaller or equal to the
409 * current attribute fork size we can always proceed.
411 * Note that if_bytes in the data fork might actually be larger than
412 * the current data fork size is due to delalloc extents. In that
413 * case either the extent count will go down when they are converted
414 * to real extents, or the delalloc conversion will take care of the
415 * literal area rebalancing.
417 if (bytes
<= XFS_IFORK_ASIZE(dp
))
418 return dp
->i_d
.di_forkoff
;
421 * For attr2 we can try to move the forkoff if there is space in the
422 * literal area, but for the old format we are done if there is no
423 * space in the fixed attribute fork.
425 if (!(mp
->m_flags
& XFS_MOUNT_ATTR2
))
428 dsize
= dp
->i_df
.if_bytes
;
430 switch (dp
->i_d
.di_format
) {
431 case XFS_DINODE_FMT_EXTENTS
:
433 * If there is no attr fork and the data fork is extents,
434 * determine if creating the default attr fork will result
435 * in the extents form migrating to btree. If so, the
436 * minimum offset only needs to be the space required for
439 if (!dp
->i_d
.di_forkoff
&& dp
->i_df
.if_bytes
>
440 xfs_default_attroffset(dp
))
441 dsize
= XFS_BMDR_SPACE_CALC(MINDBTPTRS
);
443 case XFS_DINODE_FMT_BTREE
:
445 * If we have a data btree then keep forkoff if we have one,
446 * otherwise we are adding a new attr, so then we set
447 * minforkoff to where the btree root can finish so we have
448 * plenty of room for attrs
450 if (dp
->i_d
.di_forkoff
) {
451 if (offset
< dp
->i_d
.di_forkoff
)
453 return dp
->i_d
.di_forkoff
;
455 dsize
= XFS_BMAP_BROOT_SPACE(mp
, dp
->i_df
.if_broot
);
460 * A data fork btree root must have space for at least
461 * MINDBTPTRS key/ptr pairs if the data fork is small or empty.
463 minforkoff
= max(dsize
, XFS_BMDR_SPACE_CALC(MINDBTPTRS
));
464 minforkoff
= roundup(minforkoff
, 8) >> 3;
466 /* attr fork btree root can have at least this many key/ptr pairs */
467 maxforkoff
= XFS_LITINO(mp
, dp
->i_d
.di_version
) -
468 XFS_BMDR_SPACE_CALC(MINABTPTRS
);
469 maxforkoff
= maxforkoff
>> 3; /* rounded down */
471 if (offset
>= maxforkoff
)
473 if (offset
>= minforkoff
)
479 * Switch on the ATTR2 superblock bit (implies also FEATURES2)
482 xfs_sbversion_add_attr2(xfs_mount_t
*mp
, xfs_trans_t
*tp
)
484 if ((mp
->m_flags
& XFS_MOUNT_ATTR2
) &&
485 !(xfs_sb_version_hasattr2(&mp
->m_sb
))) {
486 spin_lock(&mp
->m_sb_lock
);
487 if (!xfs_sb_version_hasattr2(&mp
->m_sb
)) {
488 xfs_sb_version_addattr2(&mp
->m_sb
);
489 spin_unlock(&mp
->m_sb_lock
);
492 spin_unlock(&mp
->m_sb_lock
);
497 * Create the initial contents of a shortform attribute list.
500 xfs_attr_shortform_create(xfs_da_args_t
*args
)
502 xfs_attr_sf_hdr_t
*hdr
;
506 trace_xfs_attr_sf_create(args
);
512 ASSERT(ifp
->if_bytes
== 0);
513 if (dp
->i_d
.di_aformat
== XFS_DINODE_FMT_EXTENTS
) {
514 ifp
->if_flags
&= ~XFS_IFEXTENTS
; /* just in case */
515 dp
->i_d
.di_aformat
= XFS_DINODE_FMT_LOCAL
;
516 ifp
->if_flags
|= XFS_IFINLINE
;
518 ASSERT(ifp
->if_flags
& XFS_IFINLINE
);
520 xfs_idata_realloc(dp
, sizeof(*hdr
), XFS_ATTR_FORK
);
521 hdr
= (xfs_attr_sf_hdr_t
*)ifp
->if_u1
.if_data
;
523 hdr
->totsize
= cpu_to_be16(sizeof(*hdr
));
524 xfs_trans_log_inode(args
->trans
, dp
, XFS_ILOG_CORE
| XFS_ILOG_ADATA
);
528 * Add a name/value pair to the shortform attribute list.
529 * Overflow from the inode has already been checked for.
532 xfs_attr_shortform_add(xfs_da_args_t
*args
, int forkoff
)
534 xfs_attr_shortform_t
*sf
;
535 xfs_attr_sf_entry_t
*sfe
;
541 trace_xfs_attr_sf_add(args
);
545 dp
->i_d
.di_forkoff
= forkoff
;
548 ASSERT(ifp
->if_flags
& XFS_IFINLINE
);
549 sf
= (xfs_attr_shortform_t
*)ifp
->if_u1
.if_data
;
551 for (i
= 0; i
< sf
->hdr
.count
; sfe
= XFS_ATTR_SF_NEXTENTRY(sfe
), i
++) {
553 if (sfe
->namelen
!= args
->namelen
)
555 if (memcmp(args
->name
, sfe
->nameval
, args
->namelen
) != 0)
557 if (!xfs_attr_namesp_match(args
->flags
, sfe
->flags
))
563 offset
= (char *)sfe
- (char *)sf
;
564 size
= XFS_ATTR_SF_ENTSIZE_BYNAME(args
->namelen
, args
->valuelen
);
565 xfs_idata_realloc(dp
, size
, XFS_ATTR_FORK
);
566 sf
= (xfs_attr_shortform_t
*)ifp
->if_u1
.if_data
;
567 sfe
= (xfs_attr_sf_entry_t
*)((char *)sf
+ offset
);
569 sfe
->namelen
= args
->namelen
;
570 sfe
->valuelen
= args
->valuelen
;
571 sfe
->flags
= XFS_ATTR_NSP_ARGS_TO_ONDISK(args
->flags
);
572 memcpy(sfe
->nameval
, args
->name
, args
->namelen
);
573 memcpy(&sfe
->nameval
[args
->namelen
], args
->value
, args
->valuelen
);
575 be16_add_cpu(&sf
->hdr
.totsize
, size
);
576 xfs_trans_log_inode(args
->trans
, dp
, XFS_ILOG_CORE
| XFS_ILOG_ADATA
);
578 xfs_sbversion_add_attr2(mp
, args
->trans
);
582 * After the last attribute is removed revert to original inode format,
583 * making all literal area available to the data fork once more.
586 xfs_attr_fork_remove(
587 struct xfs_inode
*ip
,
588 struct xfs_trans
*tp
)
590 xfs_idestroy_fork(ip
, XFS_ATTR_FORK
);
591 ip
->i_d
.di_forkoff
= 0;
592 ip
->i_d
.di_aformat
= XFS_DINODE_FMT_EXTENTS
;
594 ASSERT(ip
->i_d
.di_anextents
== 0);
595 ASSERT(ip
->i_afp
== NULL
);
597 xfs_trans_log_inode(tp
, ip
, XFS_ILOG_CORE
);
601 * Remove an attribute from the shortform attribute list structure.
604 xfs_attr_shortform_remove(xfs_da_args_t
*args
)
606 xfs_attr_shortform_t
*sf
;
607 xfs_attr_sf_entry_t
*sfe
;
608 int base
, size
=0, end
, totsize
, i
;
612 trace_xfs_attr_sf_remove(args
);
616 base
= sizeof(xfs_attr_sf_hdr_t
);
617 sf
= (xfs_attr_shortform_t
*)dp
->i_afp
->if_u1
.if_data
;
620 for (i
= 0; i
< end
; sfe
= XFS_ATTR_SF_NEXTENTRY(sfe
),
622 size
= XFS_ATTR_SF_ENTSIZE(sfe
);
623 if (sfe
->namelen
!= args
->namelen
)
625 if (memcmp(sfe
->nameval
, args
->name
, args
->namelen
) != 0)
627 if (!xfs_attr_namesp_match(args
->flags
, sfe
->flags
))
635 * Fix up the attribute fork data, covering the hole
638 totsize
= be16_to_cpu(sf
->hdr
.totsize
);
640 memmove(&((char *)sf
)[base
], &((char *)sf
)[end
], totsize
- end
);
642 be16_add_cpu(&sf
->hdr
.totsize
, -size
);
645 * Fix up the start offset of the attribute fork
648 if (totsize
== sizeof(xfs_attr_sf_hdr_t
) &&
649 (mp
->m_flags
& XFS_MOUNT_ATTR2
) &&
650 (dp
->i_d
.di_format
!= XFS_DINODE_FMT_BTREE
) &&
651 !(args
->op_flags
& XFS_DA_OP_ADDNAME
)) {
652 xfs_attr_fork_remove(dp
, args
->trans
);
654 xfs_idata_realloc(dp
, -size
, XFS_ATTR_FORK
);
655 dp
->i_d
.di_forkoff
= xfs_attr_shortform_bytesfit(dp
, totsize
);
656 ASSERT(dp
->i_d
.di_forkoff
);
657 ASSERT(totsize
> sizeof(xfs_attr_sf_hdr_t
) ||
658 (args
->op_flags
& XFS_DA_OP_ADDNAME
) ||
659 !(mp
->m_flags
& XFS_MOUNT_ATTR2
) ||
660 dp
->i_d
.di_format
== XFS_DINODE_FMT_BTREE
);
661 xfs_trans_log_inode(args
->trans
, dp
,
662 XFS_ILOG_CORE
| XFS_ILOG_ADATA
);
665 xfs_sbversion_add_attr2(mp
, args
->trans
);
671 * Look up a name in a shortform attribute list structure.
675 xfs_attr_shortform_lookup(xfs_da_args_t
*args
)
677 xfs_attr_shortform_t
*sf
;
678 xfs_attr_sf_entry_t
*sfe
;
682 trace_xfs_attr_sf_lookup(args
);
684 ifp
= args
->dp
->i_afp
;
685 ASSERT(ifp
->if_flags
& XFS_IFINLINE
);
686 sf
= (xfs_attr_shortform_t
*)ifp
->if_u1
.if_data
;
688 for (i
= 0; i
< sf
->hdr
.count
;
689 sfe
= XFS_ATTR_SF_NEXTENTRY(sfe
), i
++) {
690 if (sfe
->namelen
!= args
->namelen
)
692 if (memcmp(args
->name
, sfe
->nameval
, args
->namelen
) != 0)
694 if (!xfs_attr_namesp_match(args
->flags
, sfe
->flags
))
702 * Look up a name in a shortform attribute list structure.
706 xfs_attr_shortform_getvalue(xfs_da_args_t
*args
)
708 xfs_attr_shortform_t
*sf
;
709 xfs_attr_sf_entry_t
*sfe
;
712 ASSERT(args
->dp
->i_afp
->if_flags
== XFS_IFINLINE
);
713 sf
= (xfs_attr_shortform_t
*)args
->dp
->i_afp
->if_u1
.if_data
;
715 for (i
= 0; i
< sf
->hdr
.count
;
716 sfe
= XFS_ATTR_SF_NEXTENTRY(sfe
), i
++) {
717 if (sfe
->namelen
!= args
->namelen
)
719 if (memcmp(args
->name
, sfe
->nameval
, args
->namelen
) != 0)
721 if (!xfs_attr_namesp_match(args
->flags
, sfe
->flags
))
723 if (args
->flags
& ATTR_KERNOVAL
) {
724 args
->valuelen
= sfe
->valuelen
;
727 if (args
->valuelen
< sfe
->valuelen
) {
728 args
->valuelen
= sfe
->valuelen
;
731 args
->valuelen
= sfe
->valuelen
;
732 memcpy(args
->value
, &sfe
->nameval
[args
->namelen
],
740 * Convert from using the shortform to the leaf. On success, return the
741 * buffer so that we can keep it locked until we're totally done with it.
744 xfs_attr_shortform_to_leaf(
745 struct xfs_da_args
*args
,
746 struct xfs_buf
**leaf_bp
)
749 xfs_attr_shortform_t
*sf
;
750 xfs_attr_sf_entry_t
*sfe
;
758 trace_xfs_attr_sf_to_leaf(args
);
762 sf
= (xfs_attr_shortform_t
*)ifp
->if_u1
.if_data
;
763 size
= be16_to_cpu(sf
->hdr
.totsize
);
764 tmpbuffer
= kmem_alloc(size
, KM_SLEEP
);
765 ASSERT(tmpbuffer
!= NULL
);
766 memcpy(tmpbuffer
, ifp
->if_u1
.if_data
, size
);
767 sf
= (xfs_attr_shortform_t
*)tmpbuffer
;
769 xfs_idata_realloc(dp
, -size
, XFS_ATTR_FORK
);
770 xfs_bmap_local_to_extents_empty(dp
, XFS_ATTR_FORK
);
773 error
= xfs_da_grow_inode(args
, &blkno
);
776 * If we hit an IO error middle of the transaction inside
777 * grow_inode(), we may have inconsistent data. Bail out.
781 xfs_idata_realloc(dp
, size
, XFS_ATTR_FORK
); /* try to put */
782 memcpy(ifp
->if_u1
.if_data
, tmpbuffer
, size
); /* it back */
787 error
= xfs_attr3_leaf_create(args
, blkno
, &bp
);
789 /* xfs_attr3_leaf_create may not have instantiated a block */
790 if (bp
&& (xfs_da_shrink_inode(args
, 0, bp
) != 0))
792 xfs_idata_realloc(dp
, size
, XFS_ATTR_FORK
); /* try to put */
793 memcpy(ifp
->if_u1
.if_data
, tmpbuffer
, size
); /* it back */
797 memset((char *)&nargs
, 0, sizeof(nargs
));
799 nargs
.geo
= args
->geo
;
800 nargs
.firstblock
= args
->firstblock
;
801 nargs
.dfops
= args
->dfops
;
802 nargs
.total
= args
->total
;
803 nargs
.whichfork
= XFS_ATTR_FORK
;
804 nargs
.trans
= args
->trans
;
805 nargs
.op_flags
= XFS_DA_OP_OKNOENT
;
808 for (i
= 0; i
< sf
->hdr
.count
; i
++) {
809 nargs
.name
= sfe
->nameval
;
810 nargs
.namelen
= sfe
->namelen
;
811 nargs
.value
= &sfe
->nameval
[nargs
.namelen
];
812 nargs
.valuelen
= sfe
->valuelen
;
813 nargs
.hashval
= xfs_da_hashname(sfe
->nameval
,
815 nargs
.flags
= XFS_ATTR_NSP_ONDISK_TO_ARGS(sfe
->flags
);
816 error
= xfs_attr3_leaf_lookup_int(bp
, &nargs
); /* set a->index */
817 ASSERT(error
== -ENOATTR
);
818 error
= xfs_attr3_leaf_add(bp
, &nargs
);
819 ASSERT(error
!= -ENOSPC
);
822 sfe
= XFS_ATTR_SF_NEXTENTRY(sfe
);
827 kmem_free(tmpbuffer
);
832 * Check a leaf attribute block to see if all the entries would fit into
833 * a shortform attribute list.
836 xfs_attr_shortform_allfit(
838 struct xfs_inode
*dp
)
840 struct xfs_attr_leafblock
*leaf
;
841 struct xfs_attr_leaf_entry
*entry
;
842 xfs_attr_leaf_name_local_t
*name_loc
;
843 struct xfs_attr3_icleaf_hdr leafhdr
;
846 struct xfs_mount
*mp
= bp
->b_target
->bt_mount
;
849 xfs_attr3_leaf_hdr_from_disk(mp
->m_attr_geo
, &leafhdr
, leaf
);
850 entry
= xfs_attr3_leaf_entryp(leaf
);
852 bytes
= sizeof(struct xfs_attr_sf_hdr
);
853 for (i
= 0; i
< leafhdr
.count
; entry
++, i
++) {
854 if (entry
->flags
& XFS_ATTR_INCOMPLETE
)
855 continue; /* don't copy partial entries */
856 if (!(entry
->flags
& XFS_ATTR_LOCAL
))
858 name_loc
= xfs_attr3_leaf_name_local(leaf
, i
);
859 if (name_loc
->namelen
>= XFS_ATTR_SF_ENTSIZE_MAX
)
861 if (be16_to_cpu(name_loc
->valuelen
) >= XFS_ATTR_SF_ENTSIZE_MAX
)
863 bytes
+= sizeof(struct xfs_attr_sf_entry
) - 1
865 + be16_to_cpu(name_loc
->valuelen
);
867 if ((dp
->i_mount
->m_flags
& XFS_MOUNT_ATTR2
) &&
868 (dp
->i_d
.di_format
!= XFS_DINODE_FMT_BTREE
) &&
869 (bytes
== sizeof(struct xfs_attr_sf_hdr
)))
871 return xfs_attr_shortform_bytesfit(dp
, bytes
);
874 /* Verify the consistency of an inline attribute fork. */
876 xfs_attr_shortform_verify(
877 struct xfs_inode
*ip
)
879 struct xfs_attr_shortform
*sfp
;
880 struct xfs_attr_sf_entry
*sfep
;
881 struct xfs_attr_sf_entry
*next_sfep
;
883 struct xfs_ifork
*ifp
;
887 ASSERT(ip
->i_d
.di_aformat
== XFS_DINODE_FMT_LOCAL
);
888 ifp
= XFS_IFORK_PTR(ip
, XFS_ATTR_FORK
);
889 sfp
= (struct xfs_attr_shortform
*)ifp
->if_u1
.if_data
;
890 size
= ifp
->if_bytes
;
893 * Give up if the attribute is way too short.
895 if (size
< sizeof(struct xfs_attr_sf_hdr
))
896 return __this_address
;
898 endp
= (char *)sfp
+ size
;
900 /* Check all reported entries */
901 sfep
= &sfp
->list
[0];
902 for (i
= 0; i
< sfp
->hdr
.count
; i
++) {
904 * struct xfs_attr_sf_entry has a variable length.
905 * Check the fixed-offset parts of the structure are
906 * within the data buffer.
908 if (((char *)sfep
+ sizeof(*sfep
)) >= endp
)
909 return __this_address
;
911 /* Don't allow names with known bad length. */
912 if (sfep
->namelen
== 0)
913 return __this_address
;
916 * Check that the variable-length part of the structure is
917 * within the data buffer. The next entry starts after the
918 * name component, so nextentry is an acceptable test.
920 next_sfep
= XFS_ATTR_SF_NEXTENTRY(sfep
);
921 if ((char *)next_sfep
> endp
)
922 return __this_address
;
925 * Check for unknown flags. Short form doesn't support
926 * the incomplete or local bits, so we can use the namespace
929 if (sfep
->flags
& ~XFS_ATTR_NSP_ONDISK_MASK
)
930 return __this_address
;
933 * Check for invalid namespace combinations. We only allow
934 * one namespace flag per xattr, so we can just count the
935 * bits (i.e. hweight) here.
937 if (hweight8(sfep
->flags
& XFS_ATTR_NSP_ONDISK_MASK
) > 1)
938 return __this_address
;
942 if ((void *)sfep
!= (void *)endp
)
943 return __this_address
;
949 * Convert a leaf attribute list to shortform attribute list
952 xfs_attr3_leaf_to_shortform(
954 struct xfs_da_args
*args
,
957 struct xfs_attr_leafblock
*leaf
;
958 struct xfs_attr3_icleaf_hdr ichdr
;
959 struct xfs_attr_leaf_entry
*entry
;
960 struct xfs_attr_leaf_name_local
*name_loc
;
961 struct xfs_da_args nargs
;
962 struct xfs_inode
*dp
= args
->dp
;
967 trace_xfs_attr_leaf_to_sf(args
);
969 tmpbuffer
= kmem_alloc(args
->geo
->blksize
, KM_SLEEP
);
973 memcpy(tmpbuffer
, bp
->b_addr
, args
->geo
->blksize
);
975 leaf
= (xfs_attr_leafblock_t
*)tmpbuffer
;
976 xfs_attr3_leaf_hdr_from_disk(args
->geo
, &ichdr
, leaf
);
977 entry
= xfs_attr3_leaf_entryp(leaf
);
979 /* XXX (dgc): buffer is about to be marked stale - why zero it? */
980 memset(bp
->b_addr
, 0, args
->geo
->blksize
);
983 * Clean out the prior contents of the attribute list.
985 error
= xfs_da_shrink_inode(args
, 0, bp
);
990 ASSERT(dp
->i_mount
->m_flags
& XFS_MOUNT_ATTR2
);
991 ASSERT(dp
->i_d
.di_format
!= XFS_DINODE_FMT_BTREE
);
992 xfs_attr_fork_remove(dp
, args
->trans
);
996 xfs_attr_shortform_create(args
);
999 * Copy the attributes
1001 memset((char *)&nargs
, 0, sizeof(nargs
));
1002 nargs
.geo
= args
->geo
;
1004 nargs
.firstblock
= args
->firstblock
;
1005 nargs
.dfops
= args
->dfops
;
1006 nargs
.total
= args
->total
;
1007 nargs
.whichfork
= XFS_ATTR_FORK
;
1008 nargs
.trans
= args
->trans
;
1009 nargs
.op_flags
= XFS_DA_OP_OKNOENT
;
1011 for (i
= 0; i
< ichdr
.count
; entry
++, i
++) {
1012 if (entry
->flags
& XFS_ATTR_INCOMPLETE
)
1013 continue; /* don't copy partial entries */
1014 if (!entry
->nameidx
)
1016 ASSERT(entry
->flags
& XFS_ATTR_LOCAL
);
1017 name_loc
= xfs_attr3_leaf_name_local(leaf
, i
);
1018 nargs
.name
= name_loc
->nameval
;
1019 nargs
.namelen
= name_loc
->namelen
;
1020 nargs
.value
= &name_loc
->nameval
[nargs
.namelen
];
1021 nargs
.valuelen
= be16_to_cpu(name_loc
->valuelen
);
1022 nargs
.hashval
= be32_to_cpu(entry
->hashval
);
1023 nargs
.flags
= XFS_ATTR_NSP_ONDISK_TO_ARGS(entry
->flags
);
1024 xfs_attr_shortform_add(&nargs
, forkoff
);
1029 kmem_free(tmpbuffer
);
1034 * Convert from using a single leaf to a root node and a leaf.
1037 xfs_attr3_leaf_to_node(
1038 struct xfs_da_args
*args
)
1040 struct xfs_attr_leafblock
*leaf
;
1041 struct xfs_attr3_icleaf_hdr icleafhdr
;
1042 struct xfs_attr_leaf_entry
*entries
;
1043 struct xfs_da_node_entry
*btree
;
1044 struct xfs_da3_icnode_hdr icnodehdr
;
1045 struct xfs_da_intnode
*node
;
1046 struct xfs_inode
*dp
= args
->dp
;
1047 struct xfs_mount
*mp
= dp
->i_mount
;
1048 struct xfs_buf
*bp1
= NULL
;
1049 struct xfs_buf
*bp2
= NULL
;
1053 trace_xfs_attr_leaf_to_node(args
);
1055 error
= xfs_da_grow_inode(args
, &blkno
);
1058 error
= xfs_attr3_leaf_read(args
->trans
, dp
, 0, -1, &bp1
);
1062 error
= xfs_da_get_buf(args
->trans
, dp
, blkno
, -1, &bp2
, XFS_ATTR_FORK
);
1066 /* copy leaf to new buffer, update identifiers */
1067 xfs_trans_buf_set_type(args
->trans
, bp2
, XFS_BLFT_ATTR_LEAF_BUF
);
1068 bp2
->b_ops
= bp1
->b_ops
;
1069 memcpy(bp2
->b_addr
, bp1
->b_addr
, args
->geo
->blksize
);
1070 if (xfs_sb_version_hascrc(&mp
->m_sb
)) {
1071 struct xfs_da3_blkinfo
*hdr3
= bp2
->b_addr
;
1072 hdr3
->blkno
= cpu_to_be64(bp2
->b_bn
);
1074 xfs_trans_log_buf(args
->trans
, bp2
, 0, args
->geo
->blksize
- 1);
1077 * Set up the new root node.
1079 error
= xfs_da3_node_create(args
, 0, 1, &bp1
, XFS_ATTR_FORK
);
1083 dp
->d_ops
->node_hdr_from_disk(&icnodehdr
, node
);
1084 btree
= dp
->d_ops
->node_tree_p(node
);
1087 xfs_attr3_leaf_hdr_from_disk(args
->geo
, &icleafhdr
, leaf
);
1088 entries
= xfs_attr3_leaf_entryp(leaf
);
1090 /* both on-disk, don't endian-flip twice */
1091 btree
[0].hashval
= entries
[icleafhdr
.count
- 1].hashval
;
1092 btree
[0].before
= cpu_to_be32(blkno
);
1093 icnodehdr
.count
= 1;
1094 dp
->d_ops
->node_hdr_to_disk(node
, &icnodehdr
);
1095 xfs_trans_log_buf(args
->trans
, bp1
, 0, args
->geo
->blksize
- 1);
1101 /*========================================================================
1102 * Routines used for growing the Btree.
1103 *========================================================================*/
1106 * Create the initial contents of a leaf attribute list
1107 * or a leaf in a node attribute list.
1110 xfs_attr3_leaf_create(
1111 struct xfs_da_args
*args
,
1113 struct xfs_buf
**bpp
)
1115 struct xfs_attr_leafblock
*leaf
;
1116 struct xfs_attr3_icleaf_hdr ichdr
;
1117 struct xfs_inode
*dp
= args
->dp
;
1118 struct xfs_mount
*mp
= dp
->i_mount
;
1122 trace_xfs_attr_leaf_create(args
);
1124 error
= xfs_da_get_buf(args
->trans
, args
->dp
, blkno
, -1, &bp
,
1128 bp
->b_ops
= &xfs_attr3_leaf_buf_ops
;
1129 xfs_trans_buf_set_type(args
->trans
, bp
, XFS_BLFT_ATTR_LEAF_BUF
);
1131 memset(leaf
, 0, args
->geo
->blksize
);
1133 memset(&ichdr
, 0, sizeof(ichdr
));
1134 ichdr
.firstused
= args
->geo
->blksize
;
1136 if (xfs_sb_version_hascrc(&mp
->m_sb
)) {
1137 struct xfs_da3_blkinfo
*hdr3
= bp
->b_addr
;
1139 ichdr
.magic
= XFS_ATTR3_LEAF_MAGIC
;
1141 hdr3
->blkno
= cpu_to_be64(bp
->b_bn
);
1142 hdr3
->owner
= cpu_to_be64(dp
->i_ino
);
1143 uuid_copy(&hdr3
->uuid
, &mp
->m_sb
.sb_meta_uuid
);
1145 ichdr
.freemap
[0].base
= sizeof(struct xfs_attr3_leaf_hdr
);
1147 ichdr
.magic
= XFS_ATTR_LEAF_MAGIC
;
1148 ichdr
.freemap
[0].base
= sizeof(struct xfs_attr_leaf_hdr
);
1150 ichdr
.freemap
[0].size
= ichdr
.firstused
- ichdr
.freemap
[0].base
;
1152 xfs_attr3_leaf_hdr_to_disk(args
->geo
, leaf
, &ichdr
);
1153 xfs_trans_log_buf(args
->trans
, bp
, 0, args
->geo
->blksize
- 1);
1160 * Split the leaf node, rebalance, then add the new entry.
1163 xfs_attr3_leaf_split(
1164 struct xfs_da_state
*state
,
1165 struct xfs_da_state_blk
*oldblk
,
1166 struct xfs_da_state_blk
*newblk
)
1171 trace_xfs_attr_leaf_split(state
->args
);
1174 * Allocate space for a new leaf node.
1176 ASSERT(oldblk
->magic
== XFS_ATTR_LEAF_MAGIC
);
1177 error
= xfs_da_grow_inode(state
->args
, &blkno
);
1180 error
= xfs_attr3_leaf_create(state
->args
, blkno
, &newblk
->bp
);
1183 newblk
->blkno
= blkno
;
1184 newblk
->magic
= XFS_ATTR_LEAF_MAGIC
;
1187 * Rebalance the entries across the two leaves.
1188 * NOTE: rebalance() currently depends on the 2nd block being empty.
1190 xfs_attr3_leaf_rebalance(state
, oldblk
, newblk
);
1191 error
= xfs_da3_blk_link(state
, oldblk
, newblk
);
1196 * Save info on "old" attribute for "atomic rename" ops, leaf_add()
1197 * modifies the index/blkno/rmtblk/rmtblkcnt fields to show the
1198 * "new" attrs info. Will need the "old" info to remove it later.
1200 * Insert the "new" entry in the correct block.
1202 if (state
->inleaf
) {
1203 trace_xfs_attr_leaf_add_old(state
->args
);
1204 error
= xfs_attr3_leaf_add(oldblk
->bp
, state
->args
);
1206 trace_xfs_attr_leaf_add_new(state
->args
);
1207 error
= xfs_attr3_leaf_add(newblk
->bp
, state
->args
);
1211 * Update last hashval in each block since we added the name.
1213 oldblk
->hashval
= xfs_attr_leaf_lasthash(oldblk
->bp
, NULL
);
1214 newblk
->hashval
= xfs_attr_leaf_lasthash(newblk
->bp
, NULL
);
1219 * Add a name to the leaf attribute list structure.
1224 struct xfs_da_args
*args
)
1226 struct xfs_attr_leafblock
*leaf
;
1227 struct xfs_attr3_icleaf_hdr ichdr
;
1234 trace_xfs_attr_leaf_add(args
);
1237 xfs_attr3_leaf_hdr_from_disk(args
->geo
, &ichdr
, leaf
);
1238 ASSERT(args
->index
>= 0 && args
->index
<= ichdr
.count
);
1239 entsize
= xfs_attr_leaf_newentsize(args
, NULL
);
1242 * Search through freemap for first-fit on new name length.
1243 * (may need to figure in size of entry struct too)
1245 tablesize
= (ichdr
.count
+ 1) * sizeof(xfs_attr_leaf_entry_t
)
1246 + xfs_attr3_leaf_hdr_size(leaf
);
1247 for (sum
= 0, i
= XFS_ATTR_LEAF_MAPSIZE
- 1; i
>= 0; i
--) {
1248 if (tablesize
> ichdr
.firstused
) {
1249 sum
+= ichdr
.freemap
[i
].size
;
1252 if (!ichdr
.freemap
[i
].size
)
1253 continue; /* no space in this map */
1255 if (ichdr
.freemap
[i
].base
< ichdr
.firstused
)
1256 tmp
+= sizeof(xfs_attr_leaf_entry_t
);
1257 if (ichdr
.freemap
[i
].size
>= tmp
) {
1258 tmp
= xfs_attr3_leaf_add_work(bp
, &ichdr
, args
, i
);
1261 sum
+= ichdr
.freemap
[i
].size
;
1265 * If there are no holes in the address space of the block,
1266 * and we don't have enough freespace, then compaction will do us
1267 * no good and we should just give up.
1269 if (!ichdr
.holes
&& sum
< entsize
)
1273 * Compact the entries to coalesce free space.
1274 * This may change the hdr->count via dropping INCOMPLETE entries.
1276 xfs_attr3_leaf_compact(args
, &ichdr
, bp
);
1279 * After compaction, the block is guaranteed to have only one
1280 * free region, in freemap[0]. If it is not big enough, give up.
1282 if (ichdr
.freemap
[0].size
< (entsize
+ sizeof(xfs_attr_leaf_entry_t
))) {
1287 tmp
= xfs_attr3_leaf_add_work(bp
, &ichdr
, args
, 0);
1290 xfs_attr3_leaf_hdr_to_disk(args
->geo
, leaf
, &ichdr
);
1291 xfs_trans_log_buf(args
->trans
, bp
,
1292 XFS_DA_LOGRANGE(leaf
, &leaf
->hdr
,
1293 xfs_attr3_leaf_hdr_size(leaf
)));
1298 * Add a name to a leaf attribute list structure.
1301 xfs_attr3_leaf_add_work(
1303 struct xfs_attr3_icleaf_hdr
*ichdr
,
1304 struct xfs_da_args
*args
,
1307 struct xfs_attr_leafblock
*leaf
;
1308 struct xfs_attr_leaf_entry
*entry
;
1309 struct xfs_attr_leaf_name_local
*name_loc
;
1310 struct xfs_attr_leaf_name_remote
*name_rmt
;
1311 struct xfs_mount
*mp
;
1315 trace_xfs_attr_leaf_add_work(args
);
1318 ASSERT(mapindex
>= 0 && mapindex
< XFS_ATTR_LEAF_MAPSIZE
);
1319 ASSERT(args
->index
>= 0 && args
->index
<= ichdr
->count
);
1322 * Force open some space in the entry array and fill it in.
1324 entry
= &xfs_attr3_leaf_entryp(leaf
)[args
->index
];
1325 if (args
->index
< ichdr
->count
) {
1326 tmp
= ichdr
->count
- args
->index
;
1327 tmp
*= sizeof(xfs_attr_leaf_entry_t
);
1328 memmove(entry
+ 1, entry
, tmp
);
1329 xfs_trans_log_buf(args
->trans
, bp
,
1330 XFS_DA_LOGRANGE(leaf
, entry
, tmp
+ sizeof(*entry
)));
1335 * Allocate space for the new string (at the end of the run).
1337 mp
= args
->trans
->t_mountp
;
1338 ASSERT(ichdr
->freemap
[mapindex
].base
< args
->geo
->blksize
);
1339 ASSERT((ichdr
->freemap
[mapindex
].base
& 0x3) == 0);
1340 ASSERT(ichdr
->freemap
[mapindex
].size
>=
1341 xfs_attr_leaf_newentsize(args
, NULL
));
1342 ASSERT(ichdr
->freemap
[mapindex
].size
< args
->geo
->blksize
);
1343 ASSERT((ichdr
->freemap
[mapindex
].size
& 0x3) == 0);
1345 ichdr
->freemap
[mapindex
].size
-= xfs_attr_leaf_newentsize(args
, &tmp
);
1347 entry
->nameidx
= cpu_to_be16(ichdr
->freemap
[mapindex
].base
+
1348 ichdr
->freemap
[mapindex
].size
);
1349 entry
->hashval
= cpu_to_be32(args
->hashval
);
1350 entry
->flags
= tmp
? XFS_ATTR_LOCAL
: 0;
1351 entry
->flags
|= XFS_ATTR_NSP_ARGS_TO_ONDISK(args
->flags
);
1352 if (args
->op_flags
& XFS_DA_OP_RENAME
) {
1353 entry
->flags
|= XFS_ATTR_INCOMPLETE
;
1354 if ((args
->blkno2
== args
->blkno
) &&
1355 (args
->index2
<= args
->index
)) {
1359 xfs_trans_log_buf(args
->trans
, bp
,
1360 XFS_DA_LOGRANGE(leaf
, entry
, sizeof(*entry
)));
1361 ASSERT((args
->index
== 0) ||
1362 (be32_to_cpu(entry
->hashval
) >= be32_to_cpu((entry
-1)->hashval
)));
1363 ASSERT((args
->index
== ichdr
->count
- 1) ||
1364 (be32_to_cpu(entry
->hashval
) <= be32_to_cpu((entry
+1)->hashval
)));
1367 * For "remote" attribute values, simply note that we need to
1368 * allocate space for the "remote" value. We can't actually
1369 * allocate the extents in this transaction, and we can't decide
1370 * which blocks they should be as we might allocate more blocks
1371 * as part of this transaction (a split operation for example).
1373 if (entry
->flags
& XFS_ATTR_LOCAL
) {
1374 name_loc
= xfs_attr3_leaf_name_local(leaf
, args
->index
);
1375 name_loc
->namelen
= args
->namelen
;
1376 name_loc
->valuelen
= cpu_to_be16(args
->valuelen
);
1377 memcpy((char *)name_loc
->nameval
, args
->name
, args
->namelen
);
1378 memcpy((char *)&name_loc
->nameval
[args
->namelen
], args
->value
,
1379 be16_to_cpu(name_loc
->valuelen
));
1381 name_rmt
= xfs_attr3_leaf_name_remote(leaf
, args
->index
);
1382 name_rmt
->namelen
= args
->namelen
;
1383 memcpy((char *)name_rmt
->name
, args
->name
, args
->namelen
);
1384 entry
->flags
|= XFS_ATTR_INCOMPLETE
;
1386 name_rmt
->valuelen
= 0;
1387 name_rmt
->valueblk
= 0;
1389 args
->rmtblkcnt
= xfs_attr3_rmt_blocks(mp
, args
->valuelen
);
1390 args
->rmtvaluelen
= args
->valuelen
;
1392 xfs_trans_log_buf(args
->trans
, bp
,
1393 XFS_DA_LOGRANGE(leaf
, xfs_attr3_leaf_name(leaf
, args
->index
),
1394 xfs_attr_leaf_entsize(leaf
, args
->index
)));
1397 * Update the control info for this leaf node
1399 if (be16_to_cpu(entry
->nameidx
) < ichdr
->firstused
)
1400 ichdr
->firstused
= be16_to_cpu(entry
->nameidx
);
1402 ASSERT(ichdr
->firstused
>= ichdr
->count
* sizeof(xfs_attr_leaf_entry_t
)
1403 + xfs_attr3_leaf_hdr_size(leaf
));
1404 tmp
= (ichdr
->count
- 1) * sizeof(xfs_attr_leaf_entry_t
)
1405 + xfs_attr3_leaf_hdr_size(leaf
);
1407 for (i
= 0; i
< XFS_ATTR_LEAF_MAPSIZE
; i
++) {
1408 if (ichdr
->freemap
[i
].base
== tmp
) {
1409 ichdr
->freemap
[i
].base
+= sizeof(xfs_attr_leaf_entry_t
);
1410 ichdr
->freemap
[i
].size
-= sizeof(xfs_attr_leaf_entry_t
);
1413 ichdr
->usedbytes
+= xfs_attr_leaf_entsize(leaf
, args
->index
);
1418 * Garbage collect a leaf attribute list block by copying it to a new buffer.
1421 xfs_attr3_leaf_compact(
1422 struct xfs_da_args
*args
,
1423 struct xfs_attr3_icleaf_hdr
*ichdr_dst
,
1426 struct xfs_attr_leafblock
*leaf_src
;
1427 struct xfs_attr_leafblock
*leaf_dst
;
1428 struct xfs_attr3_icleaf_hdr ichdr_src
;
1429 struct xfs_trans
*trans
= args
->trans
;
1432 trace_xfs_attr_leaf_compact(args
);
1434 tmpbuffer
= kmem_alloc(args
->geo
->blksize
, KM_SLEEP
);
1435 memcpy(tmpbuffer
, bp
->b_addr
, args
->geo
->blksize
);
1436 memset(bp
->b_addr
, 0, args
->geo
->blksize
);
1437 leaf_src
= (xfs_attr_leafblock_t
*)tmpbuffer
;
1438 leaf_dst
= bp
->b_addr
;
1441 * Copy the on-disk header back into the destination buffer to ensure
1442 * all the information in the header that is not part of the incore
1443 * header structure is preserved.
1445 memcpy(bp
->b_addr
, tmpbuffer
, xfs_attr3_leaf_hdr_size(leaf_src
));
1447 /* Initialise the incore headers */
1448 ichdr_src
= *ichdr_dst
; /* struct copy */
1449 ichdr_dst
->firstused
= args
->geo
->blksize
;
1450 ichdr_dst
->usedbytes
= 0;
1451 ichdr_dst
->count
= 0;
1452 ichdr_dst
->holes
= 0;
1453 ichdr_dst
->freemap
[0].base
= xfs_attr3_leaf_hdr_size(leaf_src
);
1454 ichdr_dst
->freemap
[0].size
= ichdr_dst
->firstused
-
1455 ichdr_dst
->freemap
[0].base
;
1457 /* write the header back to initialise the underlying buffer */
1458 xfs_attr3_leaf_hdr_to_disk(args
->geo
, leaf_dst
, ichdr_dst
);
1461 * Copy all entry's in the same (sorted) order,
1462 * but allocate name/value pairs packed and in sequence.
1464 xfs_attr3_leaf_moveents(args
, leaf_src
, &ichdr_src
, 0,
1465 leaf_dst
, ichdr_dst
, 0, ichdr_src
.count
);
1467 * this logs the entire buffer, but the caller must write the header
1468 * back to the buffer when it is finished modifying it.
1470 xfs_trans_log_buf(trans
, bp
, 0, args
->geo
->blksize
- 1);
1472 kmem_free(tmpbuffer
);
1476 * Compare two leaf blocks "order".
1477 * Return 0 unless leaf2 should go before leaf1.
1480 xfs_attr3_leaf_order(
1481 struct xfs_buf
*leaf1_bp
,
1482 struct xfs_attr3_icleaf_hdr
*leaf1hdr
,
1483 struct xfs_buf
*leaf2_bp
,
1484 struct xfs_attr3_icleaf_hdr
*leaf2hdr
)
1486 struct xfs_attr_leaf_entry
*entries1
;
1487 struct xfs_attr_leaf_entry
*entries2
;
1489 entries1
= xfs_attr3_leaf_entryp(leaf1_bp
->b_addr
);
1490 entries2
= xfs_attr3_leaf_entryp(leaf2_bp
->b_addr
);
1491 if (leaf1hdr
->count
> 0 && leaf2hdr
->count
> 0 &&
1492 ((be32_to_cpu(entries2
[0].hashval
) <
1493 be32_to_cpu(entries1
[0].hashval
)) ||
1494 (be32_to_cpu(entries2
[leaf2hdr
->count
- 1].hashval
) <
1495 be32_to_cpu(entries1
[leaf1hdr
->count
- 1].hashval
)))) {
1502 xfs_attr_leaf_order(
1503 struct xfs_buf
*leaf1_bp
,
1504 struct xfs_buf
*leaf2_bp
)
1506 struct xfs_attr3_icleaf_hdr ichdr1
;
1507 struct xfs_attr3_icleaf_hdr ichdr2
;
1508 struct xfs_mount
*mp
= leaf1_bp
->b_target
->bt_mount
;
1510 xfs_attr3_leaf_hdr_from_disk(mp
->m_attr_geo
, &ichdr1
, leaf1_bp
->b_addr
);
1511 xfs_attr3_leaf_hdr_from_disk(mp
->m_attr_geo
, &ichdr2
, leaf2_bp
->b_addr
);
1512 return xfs_attr3_leaf_order(leaf1_bp
, &ichdr1
, leaf2_bp
, &ichdr2
);
1516 * Redistribute the attribute list entries between two leaf nodes,
1517 * taking into account the size of the new entry.
1519 * NOTE: if new block is empty, then it will get the upper half of the
1520 * old block. At present, all (one) callers pass in an empty second block.
1522 * This code adjusts the args->index/blkno and args->index2/blkno2 fields
1523 * to match what it is doing in splitting the attribute leaf block. Those
1524 * values are used in "atomic rename" operations on attributes. Note that
1525 * the "new" and "old" values can end up in different blocks.
1528 xfs_attr3_leaf_rebalance(
1529 struct xfs_da_state
*state
,
1530 struct xfs_da_state_blk
*blk1
,
1531 struct xfs_da_state_blk
*blk2
)
1533 struct xfs_da_args
*args
;
1534 struct xfs_attr_leafblock
*leaf1
;
1535 struct xfs_attr_leafblock
*leaf2
;
1536 struct xfs_attr3_icleaf_hdr ichdr1
;
1537 struct xfs_attr3_icleaf_hdr ichdr2
;
1538 struct xfs_attr_leaf_entry
*entries1
;
1539 struct xfs_attr_leaf_entry
*entries2
;
1547 * Set up environment.
1549 ASSERT(blk1
->magic
== XFS_ATTR_LEAF_MAGIC
);
1550 ASSERT(blk2
->magic
== XFS_ATTR_LEAF_MAGIC
);
1551 leaf1
= blk1
->bp
->b_addr
;
1552 leaf2
= blk2
->bp
->b_addr
;
1553 xfs_attr3_leaf_hdr_from_disk(state
->args
->geo
, &ichdr1
, leaf1
);
1554 xfs_attr3_leaf_hdr_from_disk(state
->args
->geo
, &ichdr2
, leaf2
);
1555 ASSERT(ichdr2
.count
== 0);
1558 trace_xfs_attr_leaf_rebalance(args
);
1561 * Check ordering of blocks, reverse if it makes things simpler.
1563 * NOTE: Given that all (current) callers pass in an empty
1564 * second block, this code should never set "swap".
1567 if (xfs_attr3_leaf_order(blk1
->bp
, &ichdr1
, blk2
->bp
, &ichdr2
)) {
1568 struct xfs_da_state_blk
*tmp_blk
;
1569 struct xfs_attr3_icleaf_hdr tmp_ichdr
;
1575 /* struct copies to swap them rather than reconverting */
1580 leaf1
= blk1
->bp
->b_addr
;
1581 leaf2
= blk2
->bp
->b_addr
;
1586 * Examine entries until we reduce the absolute difference in
1587 * byte usage between the two blocks to a minimum. Then get
1588 * the direction to copy and the number of elements to move.
1590 * "inleaf" is true if the new entry should be inserted into blk1.
1591 * If "swap" is also true, then reverse the sense of "inleaf".
1593 state
->inleaf
= xfs_attr3_leaf_figure_balance(state
, blk1
, &ichdr1
,
1597 state
->inleaf
= !state
->inleaf
;
1600 * Move any entries required from leaf to leaf:
1602 if (count
< ichdr1
.count
) {
1604 * Figure the total bytes to be added to the destination leaf.
1606 /* number entries being moved */
1607 count
= ichdr1
.count
- count
;
1608 space
= ichdr1
.usedbytes
- totallen
;
1609 space
+= count
* sizeof(xfs_attr_leaf_entry_t
);
1612 * leaf2 is the destination, compact it if it looks tight.
1614 max
= ichdr2
.firstused
- xfs_attr3_leaf_hdr_size(leaf1
);
1615 max
-= ichdr2
.count
* sizeof(xfs_attr_leaf_entry_t
);
1617 xfs_attr3_leaf_compact(args
, &ichdr2
, blk2
->bp
);
1620 * Move high entries from leaf1 to low end of leaf2.
1622 xfs_attr3_leaf_moveents(args
, leaf1
, &ichdr1
,
1623 ichdr1
.count
- count
, leaf2
, &ichdr2
, 0, count
);
1625 } else if (count
> ichdr1
.count
) {
1627 * I assert that since all callers pass in an empty
1628 * second buffer, this code should never execute.
1633 * Figure the total bytes to be added to the destination leaf.
1635 /* number entries being moved */
1636 count
-= ichdr1
.count
;
1637 space
= totallen
- ichdr1
.usedbytes
;
1638 space
+= count
* sizeof(xfs_attr_leaf_entry_t
);
1641 * leaf1 is the destination, compact it if it looks tight.
1643 max
= ichdr1
.firstused
- xfs_attr3_leaf_hdr_size(leaf1
);
1644 max
-= ichdr1
.count
* sizeof(xfs_attr_leaf_entry_t
);
1646 xfs_attr3_leaf_compact(args
, &ichdr1
, blk1
->bp
);
1649 * Move low entries from leaf2 to high end of leaf1.
1651 xfs_attr3_leaf_moveents(args
, leaf2
, &ichdr2
, 0, leaf1
, &ichdr1
,
1652 ichdr1
.count
, count
);
1655 xfs_attr3_leaf_hdr_to_disk(state
->args
->geo
, leaf1
, &ichdr1
);
1656 xfs_attr3_leaf_hdr_to_disk(state
->args
->geo
, leaf2
, &ichdr2
);
1657 xfs_trans_log_buf(args
->trans
, blk1
->bp
, 0, args
->geo
->blksize
- 1);
1658 xfs_trans_log_buf(args
->trans
, blk2
->bp
, 0, args
->geo
->blksize
- 1);
1661 * Copy out last hashval in each block for B-tree code.
1663 entries1
= xfs_attr3_leaf_entryp(leaf1
);
1664 entries2
= xfs_attr3_leaf_entryp(leaf2
);
1665 blk1
->hashval
= be32_to_cpu(entries1
[ichdr1
.count
- 1].hashval
);
1666 blk2
->hashval
= be32_to_cpu(entries2
[ichdr2
.count
- 1].hashval
);
1669 * Adjust the expected index for insertion.
1670 * NOTE: this code depends on the (current) situation that the
1671 * second block was originally empty.
1673 * If the insertion point moved to the 2nd block, we must adjust
1674 * the index. We must also track the entry just following the
1675 * new entry for use in an "atomic rename" operation, that entry
1676 * is always the "old" entry and the "new" entry is what we are
1677 * inserting. The index/blkno fields refer to the "old" entry,
1678 * while the index2/blkno2 fields refer to the "new" entry.
1680 if (blk1
->index
> ichdr1
.count
) {
1681 ASSERT(state
->inleaf
== 0);
1682 blk2
->index
= blk1
->index
- ichdr1
.count
;
1683 args
->index
= args
->index2
= blk2
->index
;
1684 args
->blkno
= args
->blkno2
= blk2
->blkno
;
1685 } else if (blk1
->index
== ichdr1
.count
) {
1686 if (state
->inleaf
) {
1687 args
->index
= blk1
->index
;
1688 args
->blkno
= blk1
->blkno
;
1690 args
->blkno2
= blk2
->blkno
;
1693 * On a double leaf split, the original attr location
1694 * is already stored in blkno2/index2, so don't
1695 * overwrite it overwise we corrupt the tree.
1697 blk2
->index
= blk1
->index
- ichdr1
.count
;
1698 args
->index
= blk2
->index
;
1699 args
->blkno
= blk2
->blkno
;
1700 if (!state
->extravalid
) {
1702 * set the new attr location to match the old
1703 * one and let the higher level split code
1704 * decide where in the leaf to place it.
1706 args
->index2
= blk2
->index
;
1707 args
->blkno2
= blk2
->blkno
;
1711 ASSERT(state
->inleaf
== 1);
1712 args
->index
= args
->index2
= blk1
->index
;
1713 args
->blkno
= args
->blkno2
= blk1
->blkno
;
1718 * Examine entries until we reduce the absolute difference in
1719 * byte usage between the two blocks to a minimum.
1720 * GROT: Is this really necessary? With other than a 512 byte blocksize,
1721 * GROT: there will always be enough room in either block for a new entry.
1722 * GROT: Do a double-split for this case?
1725 xfs_attr3_leaf_figure_balance(
1726 struct xfs_da_state
*state
,
1727 struct xfs_da_state_blk
*blk1
,
1728 struct xfs_attr3_icleaf_hdr
*ichdr1
,
1729 struct xfs_da_state_blk
*blk2
,
1730 struct xfs_attr3_icleaf_hdr
*ichdr2
,
1734 struct xfs_attr_leafblock
*leaf1
= blk1
->bp
->b_addr
;
1735 struct xfs_attr_leafblock
*leaf2
= blk2
->bp
->b_addr
;
1736 struct xfs_attr_leaf_entry
*entry
;
1747 * Examine entries until we reduce the absolute difference in
1748 * byte usage between the two blocks to a minimum.
1750 max
= ichdr1
->count
+ ichdr2
->count
;
1751 half
= (max
+ 1) * sizeof(*entry
);
1752 half
+= ichdr1
->usedbytes
+ ichdr2
->usedbytes
+
1753 xfs_attr_leaf_newentsize(state
->args
, NULL
);
1755 lastdelta
= state
->args
->geo
->blksize
;
1756 entry
= xfs_attr3_leaf_entryp(leaf1
);
1757 for (count
= index
= 0; count
< max
; entry
++, index
++, count
++) {
1759 #define XFS_ATTR_ABS(A) (((A) < 0) ? -(A) : (A))
1761 * The new entry is in the first block, account for it.
1763 if (count
== blk1
->index
) {
1764 tmp
= totallen
+ sizeof(*entry
) +
1765 xfs_attr_leaf_newentsize(state
->args
, NULL
);
1766 if (XFS_ATTR_ABS(half
- tmp
) > lastdelta
)
1768 lastdelta
= XFS_ATTR_ABS(half
- tmp
);
1774 * Wrap around into the second block if necessary.
1776 if (count
== ichdr1
->count
) {
1778 entry
= xfs_attr3_leaf_entryp(leaf1
);
1783 * Figure out if next leaf entry would be too much.
1785 tmp
= totallen
+ sizeof(*entry
) + xfs_attr_leaf_entsize(leaf1
,
1787 if (XFS_ATTR_ABS(half
- tmp
) > lastdelta
)
1789 lastdelta
= XFS_ATTR_ABS(half
- tmp
);
1795 * Calculate the number of usedbytes that will end up in lower block.
1796 * If new entry not in lower block, fix up the count.
1798 totallen
-= count
* sizeof(*entry
);
1800 totallen
-= sizeof(*entry
) +
1801 xfs_attr_leaf_newentsize(state
->args
, NULL
);
1805 *usedbytesarg
= totallen
;
1809 /*========================================================================
1810 * Routines used for shrinking the Btree.
1811 *========================================================================*/
1814 * Check a leaf block and its neighbors to see if the block should be
1815 * collapsed into one or the other neighbor. Always keep the block
1816 * with the smaller block number.
1817 * If the current block is over 50% full, don't try to join it, return 0.
1818 * If the block is empty, fill in the state structure and return 2.
1819 * If it can be collapsed, fill in the state structure and return 1.
1820 * If nothing can be done, return 0.
1822 * GROT: allow for INCOMPLETE entries in calculation.
1825 xfs_attr3_leaf_toosmall(
1826 struct xfs_da_state
*state
,
1829 struct xfs_attr_leafblock
*leaf
;
1830 struct xfs_da_state_blk
*blk
;
1831 struct xfs_attr3_icleaf_hdr ichdr
;
1840 trace_xfs_attr_leaf_toosmall(state
->args
);
1843 * Check for the degenerate case of the block being over 50% full.
1844 * If so, it's not worth even looking to see if we might be able
1845 * to coalesce with a sibling.
1847 blk
= &state
->path
.blk
[ state
->path
.active
-1 ];
1848 leaf
= blk
->bp
->b_addr
;
1849 xfs_attr3_leaf_hdr_from_disk(state
->args
->geo
, &ichdr
, leaf
);
1850 bytes
= xfs_attr3_leaf_hdr_size(leaf
) +
1851 ichdr
.count
* sizeof(xfs_attr_leaf_entry_t
) +
1853 if (bytes
> (state
->args
->geo
->blksize
>> 1)) {
1854 *action
= 0; /* blk over 50%, don't try to join */
1859 * Check for the degenerate case of the block being empty.
1860 * If the block is empty, we'll simply delete it, no need to
1861 * coalesce it with a sibling block. We choose (arbitrarily)
1862 * to merge with the forward block unless it is NULL.
1864 if (ichdr
.count
== 0) {
1866 * Make altpath point to the block we want to keep and
1867 * path point to the block we want to drop (this one).
1869 forward
= (ichdr
.forw
!= 0);
1870 memcpy(&state
->altpath
, &state
->path
, sizeof(state
->path
));
1871 error
= xfs_da3_path_shift(state
, &state
->altpath
, forward
,
1884 * Examine each sibling block to see if we can coalesce with
1885 * at least 25% free space to spare. We need to figure out
1886 * whether to merge with the forward or the backward block.
1887 * We prefer coalescing with the lower numbered sibling so as
1888 * to shrink an attribute list over time.
1890 /* start with smaller blk num */
1891 forward
= ichdr
.forw
< ichdr
.back
;
1892 for (i
= 0; i
< 2; forward
= !forward
, i
++) {
1893 struct xfs_attr3_icleaf_hdr ichdr2
;
1900 error
= xfs_attr3_leaf_read(state
->args
->trans
, state
->args
->dp
,
1905 xfs_attr3_leaf_hdr_from_disk(state
->args
->geo
, &ichdr2
, bp
->b_addr
);
1907 bytes
= state
->args
->geo
->blksize
-
1908 (state
->args
->geo
->blksize
>> 2) -
1909 ichdr
.usedbytes
- ichdr2
.usedbytes
-
1910 ((ichdr
.count
+ ichdr2
.count
) *
1911 sizeof(xfs_attr_leaf_entry_t
)) -
1912 xfs_attr3_leaf_hdr_size(leaf
);
1914 xfs_trans_brelse(state
->args
->trans
, bp
);
1916 break; /* fits with at least 25% to spare */
1924 * Make altpath point to the block we want to keep (the lower
1925 * numbered block) and path point to the block we want to drop.
1927 memcpy(&state
->altpath
, &state
->path
, sizeof(state
->path
));
1928 if (blkno
< blk
->blkno
) {
1929 error
= xfs_da3_path_shift(state
, &state
->altpath
, forward
,
1932 error
= xfs_da3_path_shift(state
, &state
->path
, forward
,
1946 * Remove a name from the leaf attribute list structure.
1948 * Return 1 if leaf is less than 37% full, 0 if >= 37% full.
1949 * If two leaves are 37% full, when combined they will leave 25% free.
1952 xfs_attr3_leaf_remove(
1954 struct xfs_da_args
*args
)
1956 struct xfs_attr_leafblock
*leaf
;
1957 struct xfs_attr3_icleaf_hdr ichdr
;
1958 struct xfs_attr_leaf_entry
*entry
;
1967 trace_xfs_attr_leaf_remove(args
);
1970 xfs_attr3_leaf_hdr_from_disk(args
->geo
, &ichdr
, leaf
);
1972 ASSERT(ichdr
.count
> 0 && ichdr
.count
< args
->geo
->blksize
/ 8);
1973 ASSERT(args
->index
>= 0 && args
->index
< ichdr
.count
);
1974 ASSERT(ichdr
.firstused
>= ichdr
.count
* sizeof(*entry
) +
1975 xfs_attr3_leaf_hdr_size(leaf
));
1977 entry
= &xfs_attr3_leaf_entryp(leaf
)[args
->index
];
1979 ASSERT(be16_to_cpu(entry
->nameidx
) >= ichdr
.firstused
);
1980 ASSERT(be16_to_cpu(entry
->nameidx
) < args
->geo
->blksize
);
1983 * Scan through free region table:
1984 * check for adjacency of free'd entry with an existing one,
1985 * find smallest free region in case we need to replace it,
1986 * adjust any map that borders the entry table,
1988 tablesize
= ichdr
.count
* sizeof(xfs_attr_leaf_entry_t
)
1989 + xfs_attr3_leaf_hdr_size(leaf
);
1990 tmp
= ichdr
.freemap
[0].size
;
1991 before
= after
= -1;
1992 smallest
= XFS_ATTR_LEAF_MAPSIZE
- 1;
1993 entsize
= xfs_attr_leaf_entsize(leaf
, args
->index
);
1994 for (i
= 0; i
< XFS_ATTR_LEAF_MAPSIZE
; i
++) {
1995 ASSERT(ichdr
.freemap
[i
].base
< args
->geo
->blksize
);
1996 ASSERT(ichdr
.freemap
[i
].size
< args
->geo
->blksize
);
1997 if (ichdr
.freemap
[i
].base
== tablesize
) {
1998 ichdr
.freemap
[i
].base
-= sizeof(xfs_attr_leaf_entry_t
);
1999 ichdr
.freemap
[i
].size
+= sizeof(xfs_attr_leaf_entry_t
);
2002 if (ichdr
.freemap
[i
].base
+ ichdr
.freemap
[i
].size
==
2003 be16_to_cpu(entry
->nameidx
)) {
2005 } else if (ichdr
.freemap
[i
].base
==
2006 (be16_to_cpu(entry
->nameidx
) + entsize
)) {
2008 } else if (ichdr
.freemap
[i
].size
< tmp
) {
2009 tmp
= ichdr
.freemap
[i
].size
;
2015 * Coalesce adjacent freemap regions,
2016 * or replace the smallest region.
2018 if ((before
>= 0) || (after
>= 0)) {
2019 if ((before
>= 0) && (after
>= 0)) {
2020 ichdr
.freemap
[before
].size
+= entsize
;
2021 ichdr
.freemap
[before
].size
+= ichdr
.freemap
[after
].size
;
2022 ichdr
.freemap
[after
].base
= 0;
2023 ichdr
.freemap
[after
].size
= 0;
2024 } else if (before
>= 0) {
2025 ichdr
.freemap
[before
].size
+= entsize
;
2027 ichdr
.freemap
[after
].base
= be16_to_cpu(entry
->nameidx
);
2028 ichdr
.freemap
[after
].size
+= entsize
;
2032 * Replace smallest region (if it is smaller than free'd entry)
2034 if (ichdr
.freemap
[smallest
].size
< entsize
) {
2035 ichdr
.freemap
[smallest
].base
= be16_to_cpu(entry
->nameidx
);
2036 ichdr
.freemap
[smallest
].size
= entsize
;
2041 * Did we remove the first entry?
2043 if (be16_to_cpu(entry
->nameidx
) == ichdr
.firstused
)
2049 * Compress the remaining entries and zero out the removed stuff.
2051 memset(xfs_attr3_leaf_name(leaf
, args
->index
), 0, entsize
);
2052 ichdr
.usedbytes
-= entsize
;
2053 xfs_trans_log_buf(args
->trans
, bp
,
2054 XFS_DA_LOGRANGE(leaf
, xfs_attr3_leaf_name(leaf
, args
->index
),
2057 tmp
= (ichdr
.count
- args
->index
) * sizeof(xfs_attr_leaf_entry_t
);
2058 memmove(entry
, entry
+ 1, tmp
);
2060 xfs_trans_log_buf(args
->trans
, bp
,
2061 XFS_DA_LOGRANGE(leaf
, entry
, tmp
+ sizeof(xfs_attr_leaf_entry_t
)));
2063 entry
= &xfs_attr3_leaf_entryp(leaf
)[ichdr
.count
];
2064 memset(entry
, 0, sizeof(xfs_attr_leaf_entry_t
));
2067 * If we removed the first entry, re-find the first used byte
2068 * in the name area. Note that if the entry was the "firstused",
2069 * then we don't have a "hole" in our block resulting from
2070 * removing the name.
2073 tmp
= args
->geo
->blksize
;
2074 entry
= xfs_attr3_leaf_entryp(leaf
);
2075 for (i
= ichdr
.count
- 1; i
>= 0; entry
++, i
--) {
2076 ASSERT(be16_to_cpu(entry
->nameidx
) >= ichdr
.firstused
);
2077 ASSERT(be16_to_cpu(entry
->nameidx
) < args
->geo
->blksize
);
2079 if (be16_to_cpu(entry
->nameidx
) < tmp
)
2080 tmp
= be16_to_cpu(entry
->nameidx
);
2082 ichdr
.firstused
= tmp
;
2083 ASSERT(ichdr
.firstused
!= 0);
2085 ichdr
.holes
= 1; /* mark as needing compaction */
2087 xfs_attr3_leaf_hdr_to_disk(args
->geo
, leaf
, &ichdr
);
2088 xfs_trans_log_buf(args
->trans
, bp
,
2089 XFS_DA_LOGRANGE(leaf
, &leaf
->hdr
,
2090 xfs_attr3_leaf_hdr_size(leaf
)));
2093 * Check if leaf is less than 50% full, caller may want to
2094 * "join" the leaf with a sibling if so.
2096 tmp
= ichdr
.usedbytes
+ xfs_attr3_leaf_hdr_size(leaf
) +
2097 ichdr
.count
* sizeof(xfs_attr_leaf_entry_t
);
2099 return tmp
< args
->geo
->magicpct
; /* leaf is < 37% full */
2103 * Move all the attribute list entries from drop_leaf into save_leaf.
2106 xfs_attr3_leaf_unbalance(
2107 struct xfs_da_state
*state
,
2108 struct xfs_da_state_blk
*drop_blk
,
2109 struct xfs_da_state_blk
*save_blk
)
2111 struct xfs_attr_leafblock
*drop_leaf
= drop_blk
->bp
->b_addr
;
2112 struct xfs_attr_leafblock
*save_leaf
= save_blk
->bp
->b_addr
;
2113 struct xfs_attr3_icleaf_hdr drophdr
;
2114 struct xfs_attr3_icleaf_hdr savehdr
;
2115 struct xfs_attr_leaf_entry
*entry
;
2117 trace_xfs_attr_leaf_unbalance(state
->args
);
2119 drop_leaf
= drop_blk
->bp
->b_addr
;
2120 save_leaf
= save_blk
->bp
->b_addr
;
2121 xfs_attr3_leaf_hdr_from_disk(state
->args
->geo
, &drophdr
, drop_leaf
);
2122 xfs_attr3_leaf_hdr_from_disk(state
->args
->geo
, &savehdr
, save_leaf
);
2123 entry
= xfs_attr3_leaf_entryp(drop_leaf
);
2126 * Save last hashval from dying block for later Btree fixup.
2128 drop_blk
->hashval
= be32_to_cpu(entry
[drophdr
.count
- 1].hashval
);
2131 * Check if we need a temp buffer, or can we do it in place.
2132 * Note that we don't check "leaf" for holes because we will
2133 * always be dropping it, toosmall() decided that for us already.
2135 if (savehdr
.holes
== 0) {
2137 * dest leaf has no holes, so we add there. May need
2138 * to make some room in the entry array.
2140 if (xfs_attr3_leaf_order(save_blk
->bp
, &savehdr
,
2141 drop_blk
->bp
, &drophdr
)) {
2142 xfs_attr3_leaf_moveents(state
->args
,
2143 drop_leaf
, &drophdr
, 0,
2144 save_leaf
, &savehdr
, 0,
2147 xfs_attr3_leaf_moveents(state
->args
,
2148 drop_leaf
, &drophdr
, 0,
2149 save_leaf
, &savehdr
,
2150 savehdr
.count
, drophdr
.count
);
2154 * Destination has holes, so we make a temporary copy
2155 * of the leaf and add them both to that.
2157 struct xfs_attr_leafblock
*tmp_leaf
;
2158 struct xfs_attr3_icleaf_hdr tmphdr
;
2160 tmp_leaf
= kmem_zalloc(state
->args
->geo
->blksize
, KM_SLEEP
);
2163 * Copy the header into the temp leaf so that all the stuff
2164 * not in the incore header is present and gets copied back in
2165 * once we've moved all the entries.
2167 memcpy(tmp_leaf
, save_leaf
, xfs_attr3_leaf_hdr_size(save_leaf
));
2169 memset(&tmphdr
, 0, sizeof(tmphdr
));
2170 tmphdr
.magic
= savehdr
.magic
;
2171 tmphdr
.forw
= savehdr
.forw
;
2172 tmphdr
.back
= savehdr
.back
;
2173 tmphdr
.firstused
= state
->args
->geo
->blksize
;
2175 /* write the header to the temp buffer to initialise it */
2176 xfs_attr3_leaf_hdr_to_disk(state
->args
->geo
, tmp_leaf
, &tmphdr
);
2178 if (xfs_attr3_leaf_order(save_blk
->bp
, &savehdr
,
2179 drop_blk
->bp
, &drophdr
)) {
2180 xfs_attr3_leaf_moveents(state
->args
,
2181 drop_leaf
, &drophdr
, 0,
2182 tmp_leaf
, &tmphdr
, 0,
2184 xfs_attr3_leaf_moveents(state
->args
,
2185 save_leaf
, &savehdr
, 0,
2186 tmp_leaf
, &tmphdr
, tmphdr
.count
,
2189 xfs_attr3_leaf_moveents(state
->args
,
2190 save_leaf
, &savehdr
, 0,
2191 tmp_leaf
, &tmphdr
, 0,
2193 xfs_attr3_leaf_moveents(state
->args
,
2194 drop_leaf
, &drophdr
, 0,
2195 tmp_leaf
, &tmphdr
, tmphdr
.count
,
2198 memcpy(save_leaf
, tmp_leaf
, state
->args
->geo
->blksize
);
2199 savehdr
= tmphdr
; /* struct copy */
2200 kmem_free(tmp_leaf
);
2203 xfs_attr3_leaf_hdr_to_disk(state
->args
->geo
, save_leaf
, &savehdr
);
2204 xfs_trans_log_buf(state
->args
->trans
, save_blk
->bp
, 0,
2205 state
->args
->geo
->blksize
- 1);
2208 * Copy out last hashval in each block for B-tree code.
2210 entry
= xfs_attr3_leaf_entryp(save_leaf
);
2211 save_blk
->hashval
= be32_to_cpu(entry
[savehdr
.count
- 1].hashval
);
2214 /*========================================================================
2215 * Routines used for finding things in the Btree.
2216 *========================================================================*/
2219 * Look up a name in a leaf attribute list structure.
2220 * This is the internal routine, it uses the caller's buffer.
2222 * Note that duplicate keys are allowed, but only check within the
2223 * current leaf node. The Btree code must check in adjacent leaf nodes.
2225 * Return in args->index the index into the entry[] array of either
2226 * the found entry, or where the entry should have been (insert before
2229 * Don't change the args->value unless we find the attribute.
2232 xfs_attr3_leaf_lookup_int(
2234 struct xfs_da_args
*args
)
2236 struct xfs_attr_leafblock
*leaf
;
2237 struct xfs_attr3_icleaf_hdr ichdr
;
2238 struct xfs_attr_leaf_entry
*entry
;
2239 struct xfs_attr_leaf_entry
*entries
;
2240 struct xfs_attr_leaf_name_local
*name_loc
;
2241 struct xfs_attr_leaf_name_remote
*name_rmt
;
2242 xfs_dahash_t hashval
;
2246 trace_xfs_attr_leaf_lookup(args
);
2249 xfs_attr3_leaf_hdr_from_disk(args
->geo
, &ichdr
, leaf
);
2250 entries
= xfs_attr3_leaf_entryp(leaf
);
2251 if (ichdr
.count
>= args
->geo
->blksize
/ 8)
2252 return -EFSCORRUPTED
;
2255 * Binary search. (note: small blocks will skip this loop)
2257 hashval
= args
->hashval
;
2258 probe
= span
= ichdr
.count
/ 2;
2259 for (entry
= &entries
[probe
]; span
> 4; entry
= &entries
[probe
]) {
2261 if (be32_to_cpu(entry
->hashval
) < hashval
)
2263 else if (be32_to_cpu(entry
->hashval
) > hashval
)
2268 if (!(probe
>= 0 && (!ichdr
.count
|| probe
< ichdr
.count
)))
2269 return -EFSCORRUPTED
;
2270 if (!(span
<= 4 || be32_to_cpu(entry
->hashval
) == hashval
))
2271 return -EFSCORRUPTED
;
2274 * Since we may have duplicate hashval's, find the first matching
2275 * hashval in the leaf.
2277 while (probe
> 0 && be32_to_cpu(entry
->hashval
) >= hashval
) {
2281 while (probe
< ichdr
.count
&&
2282 be32_to_cpu(entry
->hashval
) < hashval
) {
2286 if (probe
== ichdr
.count
|| be32_to_cpu(entry
->hashval
) != hashval
) {
2287 args
->index
= probe
;
2292 * Duplicate keys may be present, so search all of them for a match.
2294 for (; probe
< ichdr
.count
&& (be32_to_cpu(entry
->hashval
) == hashval
);
2297 * GROT: Add code to remove incomplete entries.
2300 * If we are looking for INCOMPLETE entries, show only those.
2301 * If we are looking for complete entries, show only those.
2303 if ((args
->flags
& XFS_ATTR_INCOMPLETE
) !=
2304 (entry
->flags
& XFS_ATTR_INCOMPLETE
)) {
2307 if (entry
->flags
& XFS_ATTR_LOCAL
) {
2308 name_loc
= xfs_attr3_leaf_name_local(leaf
, probe
);
2309 if (name_loc
->namelen
!= args
->namelen
)
2311 if (memcmp(args
->name
, name_loc
->nameval
,
2312 args
->namelen
) != 0)
2314 if (!xfs_attr_namesp_match(args
->flags
, entry
->flags
))
2316 args
->index
= probe
;
2319 name_rmt
= xfs_attr3_leaf_name_remote(leaf
, probe
);
2320 if (name_rmt
->namelen
!= args
->namelen
)
2322 if (memcmp(args
->name
, name_rmt
->name
,
2323 args
->namelen
) != 0)
2325 if (!xfs_attr_namesp_match(args
->flags
, entry
->flags
))
2327 args
->index
= probe
;
2328 args
->rmtvaluelen
= be32_to_cpu(name_rmt
->valuelen
);
2329 args
->rmtblkno
= be32_to_cpu(name_rmt
->valueblk
);
2330 args
->rmtblkcnt
= xfs_attr3_rmt_blocks(
2336 args
->index
= probe
;
2341 * Get the value associated with an attribute name from a leaf attribute
2345 xfs_attr3_leaf_getvalue(
2347 struct xfs_da_args
*args
)
2349 struct xfs_attr_leafblock
*leaf
;
2350 struct xfs_attr3_icleaf_hdr ichdr
;
2351 struct xfs_attr_leaf_entry
*entry
;
2352 struct xfs_attr_leaf_name_local
*name_loc
;
2353 struct xfs_attr_leaf_name_remote
*name_rmt
;
2357 xfs_attr3_leaf_hdr_from_disk(args
->geo
, &ichdr
, leaf
);
2358 ASSERT(ichdr
.count
< args
->geo
->blksize
/ 8);
2359 ASSERT(args
->index
< ichdr
.count
);
2361 entry
= &xfs_attr3_leaf_entryp(leaf
)[args
->index
];
2362 if (entry
->flags
& XFS_ATTR_LOCAL
) {
2363 name_loc
= xfs_attr3_leaf_name_local(leaf
, args
->index
);
2364 ASSERT(name_loc
->namelen
== args
->namelen
);
2365 ASSERT(memcmp(args
->name
, name_loc
->nameval
, args
->namelen
) == 0);
2366 valuelen
= be16_to_cpu(name_loc
->valuelen
);
2367 if (args
->flags
& ATTR_KERNOVAL
) {
2368 args
->valuelen
= valuelen
;
2371 if (args
->valuelen
< valuelen
) {
2372 args
->valuelen
= valuelen
;
2375 args
->valuelen
= valuelen
;
2376 memcpy(args
->value
, &name_loc
->nameval
[args
->namelen
], valuelen
);
2378 name_rmt
= xfs_attr3_leaf_name_remote(leaf
, args
->index
);
2379 ASSERT(name_rmt
->namelen
== args
->namelen
);
2380 ASSERT(memcmp(args
->name
, name_rmt
->name
, args
->namelen
) == 0);
2381 args
->rmtvaluelen
= be32_to_cpu(name_rmt
->valuelen
);
2382 args
->rmtblkno
= be32_to_cpu(name_rmt
->valueblk
);
2383 args
->rmtblkcnt
= xfs_attr3_rmt_blocks(args
->dp
->i_mount
,
2385 if (args
->flags
& ATTR_KERNOVAL
) {
2386 args
->valuelen
= args
->rmtvaluelen
;
2389 if (args
->valuelen
< args
->rmtvaluelen
) {
2390 args
->valuelen
= args
->rmtvaluelen
;
2393 args
->valuelen
= args
->rmtvaluelen
;
2398 /*========================================================================
2400 *========================================================================*/
2403 * Move the indicated entries from one leaf to another.
2404 * NOTE: this routine modifies both source and destination leaves.
2408 xfs_attr3_leaf_moveents(
2409 struct xfs_da_args
*args
,
2410 struct xfs_attr_leafblock
*leaf_s
,
2411 struct xfs_attr3_icleaf_hdr
*ichdr_s
,
2413 struct xfs_attr_leafblock
*leaf_d
,
2414 struct xfs_attr3_icleaf_hdr
*ichdr_d
,
2418 struct xfs_attr_leaf_entry
*entry_s
;
2419 struct xfs_attr_leaf_entry
*entry_d
;
2425 * Check for nothing to do.
2431 * Set up environment.
2433 ASSERT(ichdr_s
->magic
== XFS_ATTR_LEAF_MAGIC
||
2434 ichdr_s
->magic
== XFS_ATTR3_LEAF_MAGIC
);
2435 ASSERT(ichdr_s
->magic
== ichdr_d
->magic
);
2436 ASSERT(ichdr_s
->count
> 0 && ichdr_s
->count
< args
->geo
->blksize
/ 8);
2437 ASSERT(ichdr_s
->firstused
>= (ichdr_s
->count
* sizeof(*entry_s
))
2438 + xfs_attr3_leaf_hdr_size(leaf_s
));
2439 ASSERT(ichdr_d
->count
< args
->geo
->blksize
/ 8);
2440 ASSERT(ichdr_d
->firstused
>= (ichdr_d
->count
* sizeof(*entry_d
))
2441 + xfs_attr3_leaf_hdr_size(leaf_d
));
2443 ASSERT(start_s
< ichdr_s
->count
);
2444 ASSERT(start_d
<= ichdr_d
->count
);
2445 ASSERT(count
<= ichdr_s
->count
);
2449 * Move the entries in the destination leaf up to make a hole?
2451 if (start_d
< ichdr_d
->count
) {
2452 tmp
= ichdr_d
->count
- start_d
;
2453 tmp
*= sizeof(xfs_attr_leaf_entry_t
);
2454 entry_s
= &xfs_attr3_leaf_entryp(leaf_d
)[start_d
];
2455 entry_d
= &xfs_attr3_leaf_entryp(leaf_d
)[start_d
+ count
];
2456 memmove(entry_d
, entry_s
, tmp
);
2460 * Copy all entry's in the same (sorted) order,
2461 * but allocate attribute info packed and in sequence.
2463 entry_s
= &xfs_attr3_leaf_entryp(leaf_s
)[start_s
];
2464 entry_d
= &xfs_attr3_leaf_entryp(leaf_d
)[start_d
];
2466 for (i
= 0; i
< count
; entry_s
++, entry_d
++, desti
++, i
++) {
2467 ASSERT(be16_to_cpu(entry_s
->nameidx
) >= ichdr_s
->firstused
);
2468 tmp
= xfs_attr_leaf_entsize(leaf_s
, start_s
+ i
);
2471 * Code to drop INCOMPLETE entries. Difficult to use as we
2472 * may also need to change the insertion index. Code turned
2473 * off for 6.2, should be revisited later.
2475 if (entry_s
->flags
& XFS_ATTR_INCOMPLETE
) { /* skip partials? */
2476 memset(xfs_attr3_leaf_name(leaf_s
, start_s
+ i
), 0, tmp
);
2477 ichdr_s
->usedbytes
-= tmp
;
2478 ichdr_s
->count
-= 1;
2479 entry_d
--; /* to compensate for ++ in loop hdr */
2481 if ((start_s
+ i
) < offset
)
2482 result
++; /* insertion index adjustment */
2485 ichdr_d
->firstused
-= tmp
;
2486 /* both on-disk, don't endian flip twice */
2487 entry_d
->hashval
= entry_s
->hashval
;
2488 entry_d
->nameidx
= cpu_to_be16(ichdr_d
->firstused
);
2489 entry_d
->flags
= entry_s
->flags
;
2490 ASSERT(be16_to_cpu(entry_d
->nameidx
) + tmp
2491 <= args
->geo
->blksize
);
2492 memmove(xfs_attr3_leaf_name(leaf_d
, desti
),
2493 xfs_attr3_leaf_name(leaf_s
, start_s
+ i
), tmp
);
2494 ASSERT(be16_to_cpu(entry_s
->nameidx
) + tmp
2495 <= args
->geo
->blksize
);
2496 memset(xfs_attr3_leaf_name(leaf_s
, start_s
+ i
), 0, tmp
);
2497 ichdr_s
->usedbytes
-= tmp
;
2498 ichdr_d
->usedbytes
+= tmp
;
2499 ichdr_s
->count
-= 1;
2500 ichdr_d
->count
+= 1;
2501 tmp
= ichdr_d
->count
* sizeof(xfs_attr_leaf_entry_t
)
2502 + xfs_attr3_leaf_hdr_size(leaf_d
);
2503 ASSERT(ichdr_d
->firstused
>= tmp
);
2510 * Zero out the entries we just copied.
2512 if (start_s
== ichdr_s
->count
) {
2513 tmp
= count
* sizeof(xfs_attr_leaf_entry_t
);
2514 entry_s
= &xfs_attr3_leaf_entryp(leaf_s
)[start_s
];
2515 ASSERT(((char *)entry_s
+ tmp
) <=
2516 ((char *)leaf_s
+ args
->geo
->blksize
));
2517 memset(entry_s
, 0, tmp
);
2520 * Move the remaining entries down to fill the hole,
2521 * then zero the entries at the top.
2523 tmp
= (ichdr_s
->count
- count
) * sizeof(xfs_attr_leaf_entry_t
);
2524 entry_s
= &xfs_attr3_leaf_entryp(leaf_s
)[start_s
+ count
];
2525 entry_d
= &xfs_attr3_leaf_entryp(leaf_s
)[start_s
];
2526 memmove(entry_d
, entry_s
, tmp
);
2528 tmp
= count
* sizeof(xfs_attr_leaf_entry_t
);
2529 entry_s
= &xfs_attr3_leaf_entryp(leaf_s
)[ichdr_s
->count
];
2530 ASSERT(((char *)entry_s
+ tmp
) <=
2531 ((char *)leaf_s
+ args
->geo
->blksize
));
2532 memset(entry_s
, 0, tmp
);
2536 * Fill in the freemap information
2538 ichdr_d
->freemap
[0].base
= xfs_attr3_leaf_hdr_size(leaf_d
);
2539 ichdr_d
->freemap
[0].base
+= ichdr_d
->count
* sizeof(xfs_attr_leaf_entry_t
);
2540 ichdr_d
->freemap
[0].size
= ichdr_d
->firstused
- ichdr_d
->freemap
[0].base
;
2541 ichdr_d
->freemap
[1].base
= 0;
2542 ichdr_d
->freemap
[2].base
= 0;
2543 ichdr_d
->freemap
[1].size
= 0;
2544 ichdr_d
->freemap
[2].size
= 0;
2545 ichdr_s
->holes
= 1; /* leaf may not be compact */
2549 * Pick up the last hashvalue from a leaf block.
2552 xfs_attr_leaf_lasthash(
2556 struct xfs_attr3_icleaf_hdr ichdr
;
2557 struct xfs_attr_leaf_entry
*entries
;
2558 struct xfs_mount
*mp
= bp
->b_target
->bt_mount
;
2560 xfs_attr3_leaf_hdr_from_disk(mp
->m_attr_geo
, &ichdr
, bp
->b_addr
);
2561 entries
= xfs_attr3_leaf_entryp(bp
->b_addr
);
2563 *count
= ichdr
.count
;
2566 return be32_to_cpu(entries
[ichdr
.count
- 1].hashval
);
2570 * Calculate the number of bytes used to store the indicated attribute
2571 * (whether local or remote only calculate bytes in this block).
2574 xfs_attr_leaf_entsize(xfs_attr_leafblock_t
*leaf
, int index
)
2576 struct xfs_attr_leaf_entry
*entries
;
2577 xfs_attr_leaf_name_local_t
*name_loc
;
2578 xfs_attr_leaf_name_remote_t
*name_rmt
;
2581 entries
= xfs_attr3_leaf_entryp(leaf
);
2582 if (entries
[index
].flags
& XFS_ATTR_LOCAL
) {
2583 name_loc
= xfs_attr3_leaf_name_local(leaf
, index
);
2584 size
= xfs_attr_leaf_entsize_local(name_loc
->namelen
,
2585 be16_to_cpu(name_loc
->valuelen
));
2587 name_rmt
= xfs_attr3_leaf_name_remote(leaf
, index
);
2588 size
= xfs_attr_leaf_entsize_remote(name_rmt
->namelen
);
2594 * Calculate the number of bytes that would be required to store the new
2595 * attribute (whether local or remote only calculate bytes in this block).
2596 * This routine decides as a side effect whether the attribute will be
2597 * a "local" or a "remote" attribute.
2600 xfs_attr_leaf_newentsize(
2601 struct xfs_da_args
*args
,
2606 size
= xfs_attr_leaf_entsize_local(args
->namelen
, args
->valuelen
);
2607 if (size
< xfs_attr_leaf_entsize_local_max(args
->geo
->blksize
)) {
2614 return xfs_attr_leaf_entsize_remote(args
->namelen
);
2618 /*========================================================================
2619 * Manage the INCOMPLETE flag in a leaf entry
2620 *========================================================================*/
2623 * Clear the INCOMPLETE flag on an entry in a leaf block.
2626 xfs_attr3_leaf_clearflag(
2627 struct xfs_da_args
*args
)
2629 struct xfs_attr_leafblock
*leaf
;
2630 struct xfs_attr_leaf_entry
*entry
;
2631 struct xfs_attr_leaf_name_remote
*name_rmt
;
2635 struct xfs_attr3_icleaf_hdr ichdr
;
2636 xfs_attr_leaf_name_local_t
*name_loc
;
2641 trace_xfs_attr_leaf_clearflag(args
);
2643 * Set up the operation.
2645 error
= xfs_attr3_leaf_read(args
->trans
, args
->dp
, args
->blkno
, -1, &bp
);
2650 entry
= &xfs_attr3_leaf_entryp(leaf
)[args
->index
];
2651 ASSERT(entry
->flags
& XFS_ATTR_INCOMPLETE
);
2654 xfs_attr3_leaf_hdr_from_disk(args
->geo
, &ichdr
, leaf
);
2655 ASSERT(args
->index
< ichdr
.count
);
2656 ASSERT(args
->index
>= 0);
2658 if (entry
->flags
& XFS_ATTR_LOCAL
) {
2659 name_loc
= xfs_attr3_leaf_name_local(leaf
, args
->index
);
2660 namelen
= name_loc
->namelen
;
2661 name
= (char *)name_loc
->nameval
;
2663 name_rmt
= xfs_attr3_leaf_name_remote(leaf
, args
->index
);
2664 namelen
= name_rmt
->namelen
;
2665 name
= (char *)name_rmt
->name
;
2667 ASSERT(be32_to_cpu(entry
->hashval
) == args
->hashval
);
2668 ASSERT(namelen
== args
->namelen
);
2669 ASSERT(memcmp(name
, args
->name
, namelen
) == 0);
2672 entry
->flags
&= ~XFS_ATTR_INCOMPLETE
;
2673 xfs_trans_log_buf(args
->trans
, bp
,
2674 XFS_DA_LOGRANGE(leaf
, entry
, sizeof(*entry
)));
2676 if (args
->rmtblkno
) {
2677 ASSERT((entry
->flags
& XFS_ATTR_LOCAL
) == 0);
2678 name_rmt
= xfs_attr3_leaf_name_remote(leaf
, args
->index
);
2679 name_rmt
->valueblk
= cpu_to_be32(args
->rmtblkno
);
2680 name_rmt
->valuelen
= cpu_to_be32(args
->rmtvaluelen
);
2681 xfs_trans_log_buf(args
->trans
, bp
,
2682 XFS_DA_LOGRANGE(leaf
, name_rmt
, sizeof(*name_rmt
)));
2686 * Commit the flag value change and start the next trans in series.
2688 return xfs_trans_roll_inode(&args
->trans
, args
->dp
);
2692 * Set the INCOMPLETE flag on an entry in a leaf block.
2695 xfs_attr3_leaf_setflag(
2696 struct xfs_da_args
*args
)
2698 struct xfs_attr_leafblock
*leaf
;
2699 struct xfs_attr_leaf_entry
*entry
;
2700 struct xfs_attr_leaf_name_remote
*name_rmt
;
2704 struct xfs_attr3_icleaf_hdr ichdr
;
2707 trace_xfs_attr_leaf_setflag(args
);
2710 * Set up the operation.
2712 error
= xfs_attr3_leaf_read(args
->trans
, args
->dp
, args
->blkno
, -1, &bp
);
2718 xfs_attr3_leaf_hdr_from_disk(args
->geo
, &ichdr
, leaf
);
2719 ASSERT(args
->index
< ichdr
.count
);
2720 ASSERT(args
->index
>= 0);
2722 entry
= &xfs_attr3_leaf_entryp(leaf
)[args
->index
];
2724 ASSERT((entry
->flags
& XFS_ATTR_INCOMPLETE
) == 0);
2725 entry
->flags
|= XFS_ATTR_INCOMPLETE
;
2726 xfs_trans_log_buf(args
->trans
, bp
,
2727 XFS_DA_LOGRANGE(leaf
, entry
, sizeof(*entry
)));
2728 if ((entry
->flags
& XFS_ATTR_LOCAL
) == 0) {
2729 name_rmt
= xfs_attr3_leaf_name_remote(leaf
, args
->index
);
2730 name_rmt
->valueblk
= 0;
2731 name_rmt
->valuelen
= 0;
2732 xfs_trans_log_buf(args
->trans
, bp
,
2733 XFS_DA_LOGRANGE(leaf
, name_rmt
, sizeof(*name_rmt
)));
2737 * Commit the flag value change and start the next trans in series.
2739 return xfs_trans_roll_inode(&args
->trans
, args
->dp
);
2743 * In a single transaction, clear the INCOMPLETE flag on the leaf entry
2744 * given by args->blkno/index and set the INCOMPLETE flag on the leaf
2745 * entry given by args->blkno2/index2.
2747 * Note that they could be in different blocks, or in the same block.
2750 xfs_attr3_leaf_flipflags(
2751 struct xfs_da_args
*args
)
2753 struct xfs_attr_leafblock
*leaf1
;
2754 struct xfs_attr_leafblock
*leaf2
;
2755 struct xfs_attr_leaf_entry
*entry1
;
2756 struct xfs_attr_leaf_entry
*entry2
;
2757 struct xfs_attr_leaf_name_remote
*name_rmt
;
2758 struct xfs_buf
*bp1
;
2759 struct xfs_buf
*bp2
;
2762 struct xfs_attr3_icleaf_hdr ichdr1
;
2763 struct xfs_attr3_icleaf_hdr ichdr2
;
2764 xfs_attr_leaf_name_local_t
*name_loc
;
2765 int namelen1
, namelen2
;
2766 char *name1
, *name2
;
2769 trace_xfs_attr_leaf_flipflags(args
);
2772 * Read the block containing the "old" attr
2774 error
= xfs_attr3_leaf_read(args
->trans
, args
->dp
, args
->blkno
, -1, &bp1
);
2779 * Read the block containing the "new" attr, if it is different
2781 if (args
->blkno2
!= args
->blkno
) {
2782 error
= xfs_attr3_leaf_read(args
->trans
, args
->dp
, args
->blkno2
,
2790 leaf1
= bp1
->b_addr
;
2791 entry1
= &xfs_attr3_leaf_entryp(leaf1
)[args
->index
];
2793 leaf2
= bp2
->b_addr
;
2794 entry2
= &xfs_attr3_leaf_entryp(leaf2
)[args
->index2
];
2797 xfs_attr3_leaf_hdr_from_disk(args
->geo
, &ichdr1
, leaf1
);
2798 ASSERT(args
->index
< ichdr1
.count
);
2799 ASSERT(args
->index
>= 0);
2801 xfs_attr3_leaf_hdr_from_disk(args
->geo
, &ichdr2
, leaf2
);
2802 ASSERT(args
->index2
< ichdr2
.count
);
2803 ASSERT(args
->index2
>= 0);
2805 if (entry1
->flags
& XFS_ATTR_LOCAL
) {
2806 name_loc
= xfs_attr3_leaf_name_local(leaf1
, args
->index
);
2807 namelen1
= name_loc
->namelen
;
2808 name1
= (char *)name_loc
->nameval
;
2810 name_rmt
= xfs_attr3_leaf_name_remote(leaf1
, args
->index
);
2811 namelen1
= name_rmt
->namelen
;
2812 name1
= (char *)name_rmt
->name
;
2814 if (entry2
->flags
& XFS_ATTR_LOCAL
) {
2815 name_loc
= xfs_attr3_leaf_name_local(leaf2
, args
->index2
);
2816 namelen2
= name_loc
->namelen
;
2817 name2
= (char *)name_loc
->nameval
;
2819 name_rmt
= xfs_attr3_leaf_name_remote(leaf2
, args
->index2
);
2820 namelen2
= name_rmt
->namelen
;
2821 name2
= (char *)name_rmt
->name
;
2823 ASSERT(be32_to_cpu(entry1
->hashval
) == be32_to_cpu(entry2
->hashval
));
2824 ASSERT(namelen1
== namelen2
);
2825 ASSERT(memcmp(name1
, name2
, namelen1
) == 0);
2828 ASSERT(entry1
->flags
& XFS_ATTR_INCOMPLETE
);
2829 ASSERT((entry2
->flags
& XFS_ATTR_INCOMPLETE
) == 0);
2831 entry1
->flags
&= ~XFS_ATTR_INCOMPLETE
;
2832 xfs_trans_log_buf(args
->trans
, bp1
,
2833 XFS_DA_LOGRANGE(leaf1
, entry1
, sizeof(*entry1
)));
2834 if (args
->rmtblkno
) {
2835 ASSERT((entry1
->flags
& XFS_ATTR_LOCAL
) == 0);
2836 name_rmt
= xfs_attr3_leaf_name_remote(leaf1
, args
->index
);
2837 name_rmt
->valueblk
= cpu_to_be32(args
->rmtblkno
);
2838 name_rmt
->valuelen
= cpu_to_be32(args
->rmtvaluelen
);
2839 xfs_trans_log_buf(args
->trans
, bp1
,
2840 XFS_DA_LOGRANGE(leaf1
, name_rmt
, sizeof(*name_rmt
)));
2843 entry2
->flags
|= XFS_ATTR_INCOMPLETE
;
2844 xfs_trans_log_buf(args
->trans
, bp2
,
2845 XFS_DA_LOGRANGE(leaf2
, entry2
, sizeof(*entry2
)));
2846 if ((entry2
->flags
& XFS_ATTR_LOCAL
) == 0) {
2847 name_rmt
= xfs_attr3_leaf_name_remote(leaf2
, args
->index2
);
2848 name_rmt
->valueblk
= 0;
2849 name_rmt
->valuelen
= 0;
2850 xfs_trans_log_buf(args
->trans
, bp2
,
2851 XFS_DA_LOGRANGE(leaf2
, name_rmt
, sizeof(*name_rmt
)));
2855 * Commit the flag value change and start the next trans in series.
2857 error
= xfs_trans_roll_inode(&args
->trans
, args
->dp
);