blob: 8f1ec73725d386ca433a44beea72f25ead80d220 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Nathan Scott7b718762005-11-02 14:58:39 +11002 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
Nathan Scott7b718762005-11-02 14:58:39 +11005 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * published by the Free Software Foundation.
8 *
Nathan Scott7b718762005-11-02 14:58:39 +11009 * 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 *
Nathan Scott7b718762005-11-02 14:58:39 +110014 * 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include "xfs.h"
Nathan Scotta844f452005-11-02 14:38:42 +110019#include "xfs_fs.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include "xfs_types.h"
Nathan Scotta844f452005-11-02 14:38:42 +110021#include "xfs_bit.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include "xfs_log.h"
Nathan Scotta844f452005-11-02 14:38:42 +110023#include "xfs_inum.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include "xfs_trans.h"
25#include "xfs_sb.h"
26#include "xfs_ag.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include "xfs_dir2.h"
28#include "xfs_dmapi.h"
29#include "xfs_mount.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include "xfs_bmap_btree.h"
Nathan Scotta844f452005-11-02 14:38:42 +110031#include "xfs_alloc_btree.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070032#include "xfs_ialloc_btree.h"
Nathan Scotta844f452005-11-02 14:38:42 +110033#include "xfs_dir2_sf.h"
34#include "xfs_attr_sf.h"
35#include "xfs_dinode.h"
36#include "xfs_inode.h"
37#include "xfs_inode_item.h"
38#include "xfs_alloc.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070039#include "xfs_btree.h"
Christoph Hellwig8c4ed632008-10-30 16:55:13 +110040#include "xfs_btree_trace.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#include "xfs_ialloc.h"
42#include "xfs_itable.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070043#include "xfs_bmap.h"
44#include "xfs_error.h"
45#include "xfs_quota.h"
46
Linus Torvalds1da177e2005-04-16 15:20:36 -070047/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070048 * Determine the extent state.
49 */
50/* ARGSUSED */
51STATIC xfs_exntst_t
52xfs_extent_state(
53 xfs_filblks_t blks,
54 int extent_flag)
55{
56 if (extent_flag) {
57 ASSERT(blks != 0); /* saved for DMIG */
58 return XFS_EXT_UNWRITTEN;
59 }
60 return XFS_EXT_NORM;
61}
62
Linus Torvalds1da177e2005-04-16 15:20:36 -070063/*
64 * Convert on-disk form of btree root to in-memory form.
65 */
66void
67xfs_bmdr_to_bmbt(
Christoph Hellwig60197e82008-10-30 17:11:19 +110068 struct xfs_mount *mp,
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 xfs_bmdr_block_t *dblock,
70 int dblocklen,
Christoph Hellwig7cc95a82008-10-30 17:14:34 +110071 struct xfs_btree_block *rblock,
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 int rblocklen)
73{
74 int dmxr;
75 xfs_bmbt_key_t *fkp;
Christoph Hellwig576039c2006-09-28 10:58:06 +100076 __be64 *fpp;
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 xfs_bmbt_key_t *tkp;
Christoph Hellwig576039c2006-09-28 10:58:06 +100078 __be64 *tpp;
Linus Torvalds1da177e2005-04-16 15:20:36 -070079
Christoph Hellwig16259e72005-11-02 15:11:25 +110080 rblock->bb_magic = cpu_to_be32(XFS_BMAP_MAGIC);
81 rblock->bb_level = dblock->bb_level;
82 ASSERT(be16_to_cpu(rblock->bb_level) > 0);
83 rblock->bb_numrecs = dblock->bb_numrecs;
Christoph Hellwig7cc95a82008-10-30 17:14:34 +110084 rblock->bb_u.l.bb_leftsib = cpu_to_be64(NULLDFSBNO);
85 rblock->bb_u.l.bb_rightsib = cpu_to_be64(NULLDFSBNO);
Christoph Hellwig60197e82008-10-30 17:11:19 +110086 dmxr = xfs_bmdr_maxrecs(mp, dblocklen, 0);
Christoph Hellwig136341b2008-10-30 17:11:40 +110087 fkp = XFS_BMDR_KEY_ADDR(dblock, 1);
88 tkp = XFS_BMBT_KEY_ADDR(mp, rblock, 1);
89 fpp = XFS_BMDR_PTR_ADDR(dblock, 1, dmxr);
Christoph Hellwig60197e82008-10-30 17:11:19 +110090 tpp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, rblocklen);
Christoph Hellwig16259e72005-11-02 15:11:25 +110091 dmxr = be16_to_cpu(dblock->bb_numrecs);
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 memcpy(tkp, fkp, sizeof(*fkp) * dmxr);
Christoph Hellwig576039c2006-09-28 10:58:06 +100093 memcpy(tpp, fpp, sizeof(*fpp) * dmxr);
Linus Torvalds1da177e2005-04-16 15:20:36 -070094}
95
96/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 * Convert a compressed bmap extent record to an uncompressed form.
98 * This code must be in sync with the routines xfs_bmbt_get_startoff,
99 * xfs_bmbt_get_startblock, xfs_bmbt_get_blockcount and xfs_bmbt_get_state.
100 */
101
David Chinner7989cb82007-02-10 18:34:56 +1100102STATIC_INLINE void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103__xfs_bmbt_get_all(
104 __uint64_t l0,
105 __uint64_t l1,
106 xfs_bmbt_irec_t *s)
107{
108 int ext_flag;
109 xfs_exntst_t st;
110
111 ext_flag = (int)(l0 >> (64 - BMBT_EXNTFLAG_BITLEN));
112 s->br_startoff = ((xfs_fileoff_t)l0 &
113 XFS_MASK64LO(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
114#if XFS_BIG_BLKNOS
115 s->br_startblock = (((xfs_fsblock_t)l0 & XFS_MASK64LO(9)) << 43) |
116 (((xfs_fsblock_t)l1) >> 21);
117#else
118#ifdef DEBUG
119 {
120 xfs_dfsbno_t b;
121
122 b = (((xfs_dfsbno_t)l0 & XFS_MASK64LO(9)) << 43) |
123 (((xfs_dfsbno_t)l1) >> 21);
124 ASSERT((b >> 32) == 0 || ISNULLDSTARTBLOCK(b));
125 s->br_startblock = (xfs_fsblock_t)b;
126 }
127#else /* !DEBUG */
128 s->br_startblock = (xfs_fsblock_t)(((xfs_dfsbno_t)l1) >> 21);
129#endif /* DEBUG */
130#endif /* XFS_BIG_BLKNOS */
131 s->br_blockcount = (xfs_filblks_t)(l1 & XFS_MASK64LO(21));
132 /* This is xfs_extent_state() in-line */
133 if (ext_flag) {
134 ASSERT(s->br_blockcount != 0); /* saved for DMIG */
135 st = XFS_EXT_UNWRITTEN;
136 } else
137 st = XFS_EXT_NORM;
138 s->br_state = st;
139}
140
141void
142xfs_bmbt_get_all(
Christoph Hellwiga6f64d42007-08-16 16:23:40 +1000143 xfs_bmbt_rec_host_t *r,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 xfs_bmbt_irec_t *s)
145{
146 __xfs_bmbt_get_all(r->l0, r->l1, s);
147}
148
149/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 * Extract the blockcount field from an in memory bmap extent record.
151 */
152xfs_filblks_t
153xfs_bmbt_get_blockcount(
Christoph Hellwiga6f64d42007-08-16 16:23:40 +1000154 xfs_bmbt_rec_host_t *r)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155{
156 return (xfs_filblks_t)(r->l1 & XFS_MASK64LO(21));
157}
158
159/*
160 * Extract the startblock field from an in memory bmap extent record.
161 */
162xfs_fsblock_t
163xfs_bmbt_get_startblock(
Christoph Hellwiga6f64d42007-08-16 16:23:40 +1000164 xfs_bmbt_rec_host_t *r)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165{
166#if XFS_BIG_BLKNOS
167 return (((xfs_fsblock_t)r->l0 & XFS_MASK64LO(9)) << 43) |
168 (((xfs_fsblock_t)r->l1) >> 21);
169#else
170#ifdef DEBUG
171 xfs_dfsbno_t b;
172
173 b = (((xfs_dfsbno_t)r->l0 & XFS_MASK64LO(9)) << 43) |
174 (((xfs_dfsbno_t)r->l1) >> 21);
175 ASSERT((b >> 32) == 0 || ISNULLDSTARTBLOCK(b));
176 return (xfs_fsblock_t)b;
177#else /* !DEBUG */
178 return (xfs_fsblock_t)(((xfs_dfsbno_t)r->l1) >> 21);
179#endif /* DEBUG */
180#endif /* XFS_BIG_BLKNOS */
181}
182
183/*
184 * Extract the startoff field from an in memory bmap extent record.
185 */
186xfs_fileoff_t
187xfs_bmbt_get_startoff(
Christoph Hellwiga6f64d42007-08-16 16:23:40 +1000188 xfs_bmbt_rec_host_t *r)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700189{
190 return ((xfs_fileoff_t)r->l0 &
191 XFS_MASK64LO(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
192}
193
194xfs_exntst_t
195xfs_bmbt_get_state(
Christoph Hellwiga6f64d42007-08-16 16:23:40 +1000196 xfs_bmbt_rec_host_t *r)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197{
198 int ext_flag;
199
200 ext_flag = (int)((r->l0) >> (64 - BMBT_EXNTFLAG_BITLEN));
201 return xfs_extent_state(xfs_bmbt_get_blockcount(r),
202 ext_flag);
203}
204
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205/* Endian flipping versions of the bmbt extraction functions */
206void
207xfs_bmbt_disk_get_all(
208 xfs_bmbt_rec_t *r,
209 xfs_bmbt_irec_t *s)
210{
Christoph Hellwigad1ad962008-12-22 09:59:06 -0500211 __xfs_bmbt_get_all(get_unaligned_be64(&r->l0),
212 get_unaligned_be64(&r->l1), s);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213}
214
215/*
216 * Extract the blockcount field from an on disk bmap extent record.
217 */
218xfs_filblks_t
219xfs_bmbt_disk_get_blockcount(
220 xfs_bmbt_rec_t *r)
221{
Christoph Hellwigcd8b0a92007-08-16 16:24:15 +1000222 return (xfs_filblks_t)(be64_to_cpu(r->l1) & XFS_MASK64LO(21));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223}
224
225/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 * Extract the startoff field from a disk format bmap extent record.
227 */
228xfs_fileoff_t
229xfs_bmbt_disk_get_startoff(
230 xfs_bmbt_rec_t *r)
231{
Christoph Hellwigcd8b0a92007-08-16 16:24:15 +1000232 return ((xfs_fileoff_t)be64_to_cpu(r->l0) &
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 XFS_MASK64LO(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
234}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237/*
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000238 * Set all the fields in a bmap extent record from the arguments.
239 */
240void
241xfs_bmbt_set_allf(
242 xfs_bmbt_rec_host_t *r,
243 xfs_fileoff_t startoff,
244 xfs_fsblock_t startblock,
245 xfs_filblks_t blockcount,
246 xfs_exntst_t state)
247{
248 int extent_flag = (state == XFS_EXT_NORM) ? 0 : 1;
249
250 ASSERT(state == XFS_EXT_NORM || state == XFS_EXT_UNWRITTEN);
251 ASSERT((startoff & XFS_MASK64HI(64-BMBT_STARTOFF_BITLEN)) == 0);
252 ASSERT((blockcount & XFS_MASK64HI(64-BMBT_BLOCKCOUNT_BITLEN)) == 0);
253
254#if XFS_BIG_BLKNOS
255 ASSERT((startblock & XFS_MASK64HI(64-BMBT_STARTBLOCK_BITLEN)) == 0);
256
257 r->l0 = ((xfs_bmbt_rec_base_t)extent_flag << 63) |
258 ((xfs_bmbt_rec_base_t)startoff << 9) |
259 ((xfs_bmbt_rec_base_t)startblock >> 43);
260 r->l1 = ((xfs_bmbt_rec_base_t)startblock << 21) |
261 ((xfs_bmbt_rec_base_t)blockcount &
262 (xfs_bmbt_rec_base_t)XFS_MASK64LO(21));
263#else /* !XFS_BIG_BLKNOS */
Michal Piotrowskiddc6d3b2007-08-23 16:20:10 +1000264 if (ISNULLSTARTBLOCK(startblock)) {
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000265 r->l0 = ((xfs_bmbt_rec_base_t)extent_flag << 63) |
266 ((xfs_bmbt_rec_base_t)startoff << 9) |
267 (xfs_bmbt_rec_base_t)XFS_MASK64LO(9);
268 r->l1 = XFS_MASK64HI(11) |
269 ((xfs_bmbt_rec_base_t)startblock << 21) |
270 ((xfs_bmbt_rec_base_t)blockcount &
271 (xfs_bmbt_rec_base_t)XFS_MASK64LO(21));
272 } else {
273 r->l0 = ((xfs_bmbt_rec_base_t)extent_flag << 63) |
274 ((xfs_bmbt_rec_base_t)startoff << 9);
275 r->l1 = ((xfs_bmbt_rec_base_t)startblock << 21) |
276 ((xfs_bmbt_rec_base_t)blockcount &
277 (xfs_bmbt_rec_base_t)XFS_MASK64LO(21));
278 }
279#endif /* XFS_BIG_BLKNOS */
280}
281
282/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 * Set all the fields in a bmap extent record from the uncompressed form.
284 */
285void
286xfs_bmbt_set_all(
Christoph Hellwiga6f64d42007-08-16 16:23:40 +1000287 xfs_bmbt_rec_host_t *r,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 xfs_bmbt_irec_t *s)
289{
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000290 xfs_bmbt_set_allf(r, s->br_startoff, s->br_startblock,
291 s->br_blockcount, s->br_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292}
293
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295/*
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000296 * Set all the fields in a disk format bmap extent record from the arguments.
297 */
298void
299xfs_bmbt_disk_set_allf(
300 xfs_bmbt_rec_t *r,
301 xfs_fileoff_t startoff,
302 xfs_fsblock_t startblock,
303 xfs_filblks_t blockcount,
304 xfs_exntst_t state)
305{
306 int extent_flag = (state == XFS_EXT_NORM) ? 0 : 1;
307
308 ASSERT(state == XFS_EXT_NORM || state == XFS_EXT_UNWRITTEN);
309 ASSERT((startoff & XFS_MASK64HI(64-BMBT_STARTOFF_BITLEN)) == 0);
310 ASSERT((blockcount & XFS_MASK64HI(64-BMBT_BLOCKCOUNT_BITLEN)) == 0);
311
312#if XFS_BIG_BLKNOS
313 ASSERT((startblock & XFS_MASK64HI(64-BMBT_STARTBLOCK_BITLEN)) == 0);
314
Christoph Hellwigcd8b0a92007-08-16 16:24:15 +1000315 r->l0 = cpu_to_be64(
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000316 ((xfs_bmbt_rec_base_t)extent_flag << 63) |
317 ((xfs_bmbt_rec_base_t)startoff << 9) |
318 ((xfs_bmbt_rec_base_t)startblock >> 43));
Christoph Hellwigcd8b0a92007-08-16 16:24:15 +1000319 r->l1 = cpu_to_be64(
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000320 ((xfs_bmbt_rec_base_t)startblock << 21) |
321 ((xfs_bmbt_rec_base_t)blockcount &
322 (xfs_bmbt_rec_base_t)XFS_MASK64LO(21)));
323#else /* !XFS_BIG_BLKNOS */
Michal Piotrowskiddc6d3b2007-08-23 16:20:10 +1000324 if (ISNULLSTARTBLOCK(startblock)) {
Christoph Hellwigcd8b0a92007-08-16 16:24:15 +1000325 r->l0 = cpu_to_be64(
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000326 ((xfs_bmbt_rec_base_t)extent_flag << 63) |
327 ((xfs_bmbt_rec_base_t)startoff << 9) |
328 (xfs_bmbt_rec_base_t)XFS_MASK64LO(9));
Christoph Hellwigcd8b0a92007-08-16 16:24:15 +1000329 r->l1 = cpu_to_be64(XFS_MASK64HI(11) |
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000330 ((xfs_bmbt_rec_base_t)startblock << 21) |
331 ((xfs_bmbt_rec_base_t)blockcount &
332 (xfs_bmbt_rec_base_t)XFS_MASK64LO(21)));
333 } else {
Christoph Hellwigcd8b0a92007-08-16 16:24:15 +1000334 r->l0 = cpu_to_be64(
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000335 ((xfs_bmbt_rec_base_t)extent_flag << 63) |
336 ((xfs_bmbt_rec_base_t)startoff << 9));
Christoph Hellwigcd8b0a92007-08-16 16:24:15 +1000337 r->l1 = cpu_to_be64(
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000338 ((xfs_bmbt_rec_base_t)startblock << 21) |
339 ((xfs_bmbt_rec_base_t)blockcount &
340 (xfs_bmbt_rec_base_t)XFS_MASK64LO(21)));
341 }
342#endif /* XFS_BIG_BLKNOS */
343}
344
345/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 * Set all the fields in a bmap extent record from the uncompressed form.
347 */
348void
349xfs_bmbt_disk_set_all(
350 xfs_bmbt_rec_t *r,
351 xfs_bmbt_irec_t *s)
352{
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000353 xfs_bmbt_disk_set_allf(r, s->br_startoff, s->br_startblock,
354 s->br_blockcount, s->br_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356
357/*
358 * Set the blockcount field in a bmap extent record.
359 */
360void
361xfs_bmbt_set_blockcount(
Christoph Hellwiga6f64d42007-08-16 16:23:40 +1000362 xfs_bmbt_rec_host_t *r,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 xfs_filblks_t v)
364{
365 ASSERT((v & XFS_MASK64HI(43)) == 0);
366 r->l1 = (r->l1 & (xfs_bmbt_rec_base_t)XFS_MASK64HI(43)) |
367 (xfs_bmbt_rec_base_t)(v & XFS_MASK64LO(21));
368}
369
370/*
371 * Set the startblock field in a bmap extent record.
372 */
373void
374xfs_bmbt_set_startblock(
Christoph Hellwiga6f64d42007-08-16 16:23:40 +1000375 xfs_bmbt_rec_host_t *r,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 xfs_fsblock_t v)
377{
378#if XFS_BIG_BLKNOS
379 ASSERT((v & XFS_MASK64HI(12)) == 0);
380 r->l0 = (r->l0 & (xfs_bmbt_rec_base_t)XFS_MASK64HI(55)) |
381 (xfs_bmbt_rec_base_t)(v >> 43);
382 r->l1 = (r->l1 & (xfs_bmbt_rec_base_t)XFS_MASK64LO(21)) |
383 (xfs_bmbt_rec_base_t)(v << 21);
384#else /* !XFS_BIG_BLKNOS */
385 if (ISNULLSTARTBLOCK(v)) {
386 r->l0 |= (xfs_bmbt_rec_base_t)XFS_MASK64LO(9);
387 r->l1 = (xfs_bmbt_rec_base_t)XFS_MASK64HI(11) |
388 ((xfs_bmbt_rec_base_t)v << 21) |
389 (r->l1 & (xfs_bmbt_rec_base_t)XFS_MASK64LO(21));
390 } else {
391 r->l0 &= ~(xfs_bmbt_rec_base_t)XFS_MASK64LO(9);
392 r->l1 = ((xfs_bmbt_rec_base_t)v << 21) |
393 (r->l1 & (xfs_bmbt_rec_base_t)XFS_MASK64LO(21));
394 }
395#endif /* XFS_BIG_BLKNOS */
396}
397
398/*
399 * Set the startoff field in a bmap extent record.
400 */
401void
402xfs_bmbt_set_startoff(
Christoph Hellwiga6f64d42007-08-16 16:23:40 +1000403 xfs_bmbt_rec_host_t *r,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 xfs_fileoff_t v)
405{
406 ASSERT((v & XFS_MASK64HI(9)) == 0);
407 r->l0 = (r->l0 & (xfs_bmbt_rec_base_t) XFS_MASK64HI(1)) |
408 ((xfs_bmbt_rec_base_t)v << 9) |
409 (r->l0 & (xfs_bmbt_rec_base_t)XFS_MASK64LO(9));
410}
411
412/*
413 * Set the extent state field in a bmap extent record.
414 */
415void
416xfs_bmbt_set_state(
Christoph Hellwiga6f64d42007-08-16 16:23:40 +1000417 xfs_bmbt_rec_host_t *r,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 xfs_exntst_t v)
419{
420 ASSERT(v == XFS_EXT_NORM || v == XFS_EXT_UNWRITTEN);
421 if (v == XFS_EXT_NORM)
422 r->l0 &= XFS_MASK64LO(64 - BMBT_EXNTFLAG_BITLEN);
423 else
424 r->l0 |= XFS_MASK64HI(BMBT_EXNTFLAG_BITLEN);
425}
426
427/*
428 * Convert in-memory form of btree root to on-disk form.
429 */
430void
431xfs_bmbt_to_bmdr(
Christoph Hellwig60197e82008-10-30 17:11:19 +1100432 struct xfs_mount *mp,
Christoph Hellwig7cc95a82008-10-30 17:14:34 +1100433 struct xfs_btree_block *rblock,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 int rblocklen,
435 xfs_bmdr_block_t *dblock,
436 int dblocklen)
437{
438 int dmxr;
439 xfs_bmbt_key_t *fkp;
Christoph Hellwig576039c2006-09-28 10:58:06 +1000440 __be64 *fpp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 xfs_bmbt_key_t *tkp;
Christoph Hellwig576039c2006-09-28 10:58:06 +1000442 __be64 *tpp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443
Christoph Hellwig16259e72005-11-02 15:11:25 +1100444 ASSERT(be32_to_cpu(rblock->bb_magic) == XFS_BMAP_MAGIC);
Christoph Hellwig7cc95a82008-10-30 17:14:34 +1100445 ASSERT(be64_to_cpu(rblock->bb_u.l.bb_leftsib) == NULLDFSBNO);
446 ASSERT(be64_to_cpu(rblock->bb_u.l.bb_rightsib) == NULLDFSBNO);
Christoph Hellwig16259e72005-11-02 15:11:25 +1100447 ASSERT(be16_to_cpu(rblock->bb_level) > 0);
448 dblock->bb_level = rblock->bb_level;
449 dblock->bb_numrecs = rblock->bb_numrecs;
Christoph Hellwig60197e82008-10-30 17:11:19 +1100450 dmxr = xfs_bmdr_maxrecs(mp, dblocklen, 0);
Christoph Hellwig136341b2008-10-30 17:11:40 +1100451 fkp = XFS_BMBT_KEY_ADDR(mp, rblock, 1);
452 tkp = XFS_BMDR_KEY_ADDR(dblock, 1);
Christoph Hellwig60197e82008-10-30 17:11:19 +1100453 fpp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, rblocklen);
Christoph Hellwig136341b2008-10-30 17:11:40 +1100454 tpp = XFS_BMDR_PTR_ADDR(dblock, 1, dmxr);
Christoph Hellwig16259e72005-11-02 15:11:25 +1100455 dmxr = be16_to_cpu(dblock->bb_numrecs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456 memcpy(tkp, fkp, sizeof(*fkp) * dmxr);
Christoph Hellwig576039c2006-09-28 10:58:06 +1000457 memcpy(tpp, fpp, sizeof(*fpp) * dmxr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458}
459
460/*
Mandy Kirkconnell4eea22f2006-03-14 13:29:52 +1100461 * Check extent records, which have just been read, for
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462 * any bit in the extent flag field. ASSERT on debug
463 * kernels, as this condition should not occur.
464 * Return an error condition (1) if any flags found,
465 * otherwise return 0.
466 */
467
468int
469xfs_check_nostate_extents(
Mandy Kirkconnell4eea22f2006-03-14 13:29:52 +1100470 xfs_ifork_t *ifp,
471 xfs_extnum_t idx,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472 xfs_extnum_t num)
473{
Mandy Kirkconnell4eea22f2006-03-14 13:29:52 +1100474 for (; num > 0; num--, idx++) {
Christoph Hellwiga6f64d42007-08-16 16:23:40 +1000475 xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, idx);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 if ((ep->l0 >>
477 (64 - BMBT_EXNTFLAG_BITLEN)) != 0) {
478 ASSERT(0);
479 return 1;
480 }
481 }
482 return 0;
483}
Christoph Hellwig561f7d12008-10-30 16:53:59 +1100484
485
486STATIC struct xfs_btree_cur *
487xfs_bmbt_dup_cursor(
488 struct xfs_btree_cur *cur)
489{
490 struct xfs_btree_cur *new;
491
492 new = xfs_bmbt_init_cursor(cur->bc_mp, cur->bc_tp,
493 cur->bc_private.b.ip, cur->bc_private.b.whichfork);
494
495 /*
496 * Copy the firstblock, flist, and flags values,
497 * since init cursor doesn't get them.
498 */
499 new->bc_private.b.firstblock = cur->bc_private.b.firstblock;
500 new->bc_private.b.flist = cur->bc_private.b.flist;
501 new->bc_private.b.flags = cur->bc_private.b.flags;
502
503 return new;
504}
505
Christoph Hellwig4b22a572008-10-30 16:57:40 +1100506STATIC void
507xfs_bmbt_update_cursor(
508 struct xfs_btree_cur *src,
509 struct xfs_btree_cur *dst)
510{
511 ASSERT((dst->bc_private.b.firstblock != NULLFSBLOCK) ||
512 (dst->bc_private.b.ip->i_d.di_flags & XFS_DIFLAG_REALTIME));
513 ASSERT(dst->bc_private.b.flist == src->bc_private.b.flist);
514
515 dst->bc_private.b.allocated += src->bc_private.b.allocated;
516 dst->bc_private.b.firstblock = src->bc_private.b.firstblock;
517
518 src->bc_private.b.allocated = 0;
519}
520
Christoph Hellwigce5e42d2008-10-30 16:55:23 +1100521STATIC int
Christoph Hellwigf5eb8e72008-10-30 16:57:03 +1100522xfs_bmbt_alloc_block(
523 struct xfs_btree_cur *cur,
524 union xfs_btree_ptr *start,
525 union xfs_btree_ptr *new,
526 int length,
527 int *stat)
528{
529 xfs_alloc_arg_t args; /* block allocation args */
530 int error; /* error return value */
531
532 memset(&args, 0, sizeof(args));
533 args.tp = cur->bc_tp;
534 args.mp = cur->bc_mp;
535 args.fsbno = cur->bc_private.b.firstblock;
536 args.firstblock = args.fsbno;
537
538 if (args.fsbno == NULLFSBLOCK) {
539 args.fsbno = be64_to_cpu(start->l);
540 args.type = XFS_ALLOCTYPE_START_BNO;
541 /*
542 * Make sure there is sufficient room left in the AG to
543 * complete a full tree split for an extent insert. If
544 * we are converting the middle part of an extent then
545 * we may need space for two tree splits.
546 *
547 * We are relying on the caller to make the correct block
548 * reservation for this operation to succeed. If the
549 * reservation amount is insufficient then we may fail a
550 * block allocation here and corrupt the filesystem.
551 */
552 args.minleft = xfs_trans_get_block_res(args.tp);
553 } else if (cur->bc_private.b.flist->xbf_low) {
554 args.type = XFS_ALLOCTYPE_START_BNO;
555 } else {
556 args.type = XFS_ALLOCTYPE_NEAR_BNO;
557 }
558
559 args.minlen = args.maxlen = args.prod = 1;
560 args.wasdel = cur->bc_private.b.flags & XFS_BTCUR_BPRV_WASDEL;
561 if (!args.wasdel && xfs_trans_get_block_res(args.tp) == 0) {
562 error = XFS_ERROR(ENOSPC);
563 goto error0;
564 }
565 error = xfs_alloc_vextent(&args);
566 if (error)
567 goto error0;
568
569 if (args.fsbno == NULLFSBLOCK && args.minleft) {
570 /*
571 * Could not find an AG with enough free space to satisfy
572 * a full btree split. Try again without minleft and if
573 * successful activate the lowspace algorithm.
574 */
575 args.fsbno = 0;
576 args.type = XFS_ALLOCTYPE_FIRST_AG;
577 args.minleft = 0;
578 error = xfs_alloc_vextent(&args);
579 if (error)
580 goto error0;
581 cur->bc_private.b.flist->xbf_low = 1;
582 }
583 if (args.fsbno == NULLFSBLOCK) {
584 XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
585 *stat = 0;
586 return 0;
587 }
588 ASSERT(args.len == 1);
589 cur->bc_private.b.firstblock = args.fsbno;
590 cur->bc_private.b.allocated++;
591 cur->bc_private.b.ip->i_d.di_nblocks++;
592 xfs_trans_log_inode(args.tp, cur->bc_private.b.ip, XFS_ILOG_CORE);
593 XFS_TRANS_MOD_DQUOT_BYINO(args.mp, args.tp, cur->bc_private.b.ip,
594 XFS_TRANS_DQ_BCOUNT, 1L);
595
596 new->l = cpu_to_be64(args.fsbno);
597
598 XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
599 *stat = 1;
600 return 0;
601
602 error0:
603 XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
604 return error;
605}
606
607STATIC int
Christoph Hellwigd4b3a4b2008-10-30 16:57:51 +1100608xfs_bmbt_free_block(
609 struct xfs_btree_cur *cur,
610 struct xfs_buf *bp)
611{
612 struct xfs_mount *mp = cur->bc_mp;
613 struct xfs_inode *ip = cur->bc_private.b.ip;
614 struct xfs_trans *tp = cur->bc_tp;
615 xfs_fsblock_t fsbno = XFS_DADDR_TO_FSB(mp, XFS_BUF_ADDR(bp));
616
617 xfs_bmap_add_free(fsbno, 1, cur->bc_private.b.flist, mp);
618 ip->i_d.di_nblocks--;
619
620 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
621 XFS_TRANS_MOD_DQUOT_BYINO(mp, tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
622 xfs_trans_binval(tp, bp);
623 return 0;
624}
625
626STATIC int
Christoph Hellwig91cca5df2008-10-30 16:58:01 +1100627xfs_bmbt_get_minrecs(
628 struct xfs_btree_cur *cur,
629 int level)
630{
Christoph Hellwig60197e82008-10-30 17:11:19 +1100631 if (level == cur->bc_nlevels - 1) {
632 struct xfs_ifork *ifp;
633
634 ifp = XFS_IFORK_PTR(cur->bc_private.b.ip,
635 cur->bc_private.b.whichfork);
636
637 return xfs_bmbt_maxrecs(cur->bc_mp,
638 ifp->if_broot_bytes, level == 0) / 2;
639 }
640
641 return cur->bc_mp->m_bmap_dmnr[level != 0];
Christoph Hellwig91cca5df2008-10-30 16:58:01 +1100642}
643
Christoph Hellwig60197e82008-10-30 17:11:19 +1100644int
Christoph Hellwigce5e42d2008-10-30 16:55:23 +1100645xfs_bmbt_get_maxrecs(
646 struct xfs_btree_cur *cur,
647 int level)
648{
Christoph Hellwig60197e82008-10-30 17:11:19 +1100649 if (level == cur->bc_nlevels - 1) {
650 struct xfs_ifork *ifp;
651
652 ifp = XFS_IFORK_PTR(cur->bc_private.b.ip,
653 cur->bc_private.b.whichfork);
654
655 return xfs_bmbt_maxrecs(cur->bc_mp,
656 ifp->if_broot_bytes, level == 0);
657 }
658
659 return cur->bc_mp->m_bmap_dmxr[level != 0];
660
Christoph Hellwigce5e42d2008-10-30 16:55:23 +1100661}
662
Christoph Hellwig4b22a572008-10-30 16:57:40 +1100663/*
664 * Get the maximum records we could store in the on-disk format.
665 *
666 * For non-root nodes this is equivalent to xfs_bmbt_get_maxrecs, but
667 * for the root node this checks the available space in the dinode fork
668 * so that we can resize the in-memory buffer to match it. After a
669 * resize to the maximum size this function returns the same value
670 * as xfs_bmbt_get_maxrecs for the root node, too.
671 */
672STATIC int
673xfs_bmbt_get_dmaxrecs(
674 struct xfs_btree_cur *cur,
675 int level)
676{
Christoph Hellwig60197e82008-10-30 17:11:19 +1100677 if (level != cur->bc_nlevels - 1)
678 return cur->bc_mp->m_bmap_dmxr[level != 0];
679 return xfs_bmdr_maxrecs(cur->bc_mp, cur->bc_private.b.forksize,
680 level == 0);
Christoph Hellwig4b22a572008-10-30 16:57:40 +1100681}
682
Christoph Hellwigfe033cc2008-10-30 16:56:09 +1100683STATIC void
684xfs_bmbt_init_key_from_rec(
685 union xfs_btree_key *key,
686 union xfs_btree_rec *rec)
687{
688 key->bmbt.br_startoff =
689 cpu_to_be64(xfs_bmbt_disk_get_startoff(&rec->bmbt));
690}
691
692STATIC void
Christoph Hellwig4b22a572008-10-30 16:57:40 +1100693xfs_bmbt_init_rec_from_key(
694 union xfs_btree_key *key,
695 union xfs_btree_rec *rec)
696{
697 ASSERT(key->bmbt.br_startoff != 0);
698
699 xfs_bmbt_disk_set_allf(&rec->bmbt, be64_to_cpu(key->bmbt.br_startoff),
700 0, 0, XFS_EXT_NORM);
701}
702
703STATIC void
704xfs_bmbt_init_rec_from_cur(
705 struct xfs_btree_cur *cur,
706 union xfs_btree_rec *rec)
707{
708 xfs_bmbt_disk_set_all(&rec->bmbt, &cur->bc_rec.b);
709}
710
711STATIC void
Christoph Hellwigfe033cc2008-10-30 16:56:09 +1100712xfs_bmbt_init_ptr_from_cur(
713 struct xfs_btree_cur *cur,
714 union xfs_btree_ptr *ptr)
715{
716 ptr->l = 0;
717}
718
719STATIC __int64_t
720xfs_bmbt_key_diff(
721 struct xfs_btree_cur *cur,
722 union xfs_btree_key *key)
723{
724 return (__int64_t)be64_to_cpu(key->bmbt.br_startoff) -
725 cur->bc_rec.b.br_startoff;
726}
727
Christoph Hellwig4a26e662008-10-30 16:58:32 +1100728#ifdef DEBUG
729STATIC int
730xfs_bmbt_keys_inorder(
731 struct xfs_btree_cur *cur,
732 union xfs_btree_key *k1,
733 union xfs_btree_key *k2)
734{
735 return be64_to_cpu(k1->bmbt.br_startoff) <
736 be64_to_cpu(k2->bmbt.br_startoff);
737}
738
739STATIC int
740xfs_bmbt_recs_inorder(
741 struct xfs_btree_cur *cur,
742 union xfs_btree_rec *r1,
743 union xfs_btree_rec *r2)
744{
745 return xfs_bmbt_disk_get_startoff(&r1->bmbt) +
746 xfs_bmbt_disk_get_blockcount(&r1->bmbt) <=
747 xfs_bmbt_disk_get_startoff(&r2->bmbt);
748}
749#endif /* DEBUG */
750
Christoph Hellwig8c4ed632008-10-30 16:55:13 +1100751#ifdef XFS_BTREE_TRACE
752ktrace_t *xfs_bmbt_trace_buf;
753
754STATIC void
755xfs_bmbt_trace_enter(
756 struct xfs_btree_cur *cur,
757 const char *func,
758 char *s,
759 int type,
760 int line,
761 __psunsigned_t a0,
762 __psunsigned_t a1,
763 __psunsigned_t a2,
764 __psunsigned_t a3,
765 __psunsigned_t a4,
766 __psunsigned_t a5,
767 __psunsigned_t a6,
768 __psunsigned_t a7,
769 __psunsigned_t a8,
770 __psunsigned_t a9,
771 __psunsigned_t a10)
772{
773 struct xfs_inode *ip = cur->bc_private.b.ip;
774 int whichfork = cur->bc_private.b.whichfork;
775
776 ktrace_enter(xfs_bmbt_trace_buf,
777 (void *)((__psint_t)type | (whichfork << 8) | (line << 16)),
778 (void *)func, (void *)s, (void *)ip, (void *)cur,
779 (void *)a0, (void *)a1, (void *)a2, (void *)a3,
780 (void *)a4, (void *)a5, (void *)a6, (void *)a7,
781 (void *)a8, (void *)a9, (void *)a10);
782 ktrace_enter(ip->i_btrace,
783 (void *)((__psint_t)type | (whichfork << 8) | (line << 16)),
784 (void *)func, (void *)s, (void *)ip, (void *)cur,
785 (void *)a0, (void *)a1, (void *)a2, (void *)a3,
786 (void *)a4, (void *)a5, (void *)a6, (void *)a7,
787 (void *)a8, (void *)a9, (void *)a10);
788}
789
790STATIC void
791xfs_bmbt_trace_cursor(
792 struct xfs_btree_cur *cur,
793 __uint32_t *s0,
794 __uint64_t *l0,
795 __uint64_t *l1)
796{
797 struct xfs_bmbt_rec_host r;
798
799 xfs_bmbt_set_all(&r, &cur->bc_rec.b);
800
801 *s0 = (cur->bc_nlevels << 24) |
802 (cur->bc_private.b.flags << 16) |
803 cur->bc_private.b.allocated;
804 *l0 = r.l0;
805 *l1 = r.l1;
806}
807
808STATIC void
809xfs_bmbt_trace_key(
810 struct xfs_btree_cur *cur,
811 union xfs_btree_key *key,
812 __uint64_t *l0,
813 __uint64_t *l1)
814{
815 *l0 = be64_to_cpu(key->bmbt.br_startoff);
816 *l1 = 0;
817}
818
819STATIC void
820xfs_bmbt_trace_record(
821 struct xfs_btree_cur *cur,
822 union xfs_btree_rec *rec,
823 __uint64_t *l0,
824 __uint64_t *l1,
825 __uint64_t *l2)
826{
827 struct xfs_bmbt_irec irec;
828
829 xfs_bmbt_disk_get_all(&rec->bmbt, &irec);
830 *l0 = irec.br_startoff;
831 *l1 = irec.br_startblock;
832 *l2 = irec.br_blockcount;
833}
834#endif /* XFS_BTREE_TRACE */
835
Christoph Hellwig561f7d12008-10-30 16:53:59 +1100836static const struct xfs_btree_ops xfs_bmbt_ops = {
Christoph Hellwig65f1eae2008-10-30 16:55:34 +1100837 .rec_len = sizeof(xfs_bmbt_rec_t),
838 .key_len = sizeof(xfs_bmbt_key_t),
839
Christoph Hellwig561f7d12008-10-30 16:53:59 +1100840 .dup_cursor = xfs_bmbt_dup_cursor,
Christoph Hellwig4b22a572008-10-30 16:57:40 +1100841 .update_cursor = xfs_bmbt_update_cursor,
Christoph Hellwigf5eb8e72008-10-30 16:57:03 +1100842 .alloc_block = xfs_bmbt_alloc_block,
Christoph Hellwigd4b3a4b2008-10-30 16:57:51 +1100843 .free_block = xfs_bmbt_free_block,
Christoph Hellwigce5e42d2008-10-30 16:55:23 +1100844 .get_maxrecs = xfs_bmbt_get_maxrecs,
Christoph Hellwig91cca5df2008-10-30 16:58:01 +1100845 .get_minrecs = xfs_bmbt_get_minrecs,
Christoph Hellwig4b22a572008-10-30 16:57:40 +1100846 .get_dmaxrecs = xfs_bmbt_get_dmaxrecs,
Christoph Hellwigfe033cc2008-10-30 16:56:09 +1100847 .init_key_from_rec = xfs_bmbt_init_key_from_rec,
Christoph Hellwig4b22a572008-10-30 16:57:40 +1100848 .init_rec_from_key = xfs_bmbt_init_rec_from_key,
849 .init_rec_from_cur = xfs_bmbt_init_rec_from_cur,
Christoph Hellwigfe033cc2008-10-30 16:56:09 +1100850 .init_ptr_from_cur = xfs_bmbt_init_ptr_from_cur,
851 .key_diff = xfs_bmbt_key_diff,
Christoph Hellwig8c4ed632008-10-30 16:55:13 +1100852
Christoph Hellwig4a26e662008-10-30 16:58:32 +1100853#ifdef DEBUG
854 .keys_inorder = xfs_bmbt_keys_inorder,
855 .recs_inorder = xfs_bmbt_recs_inorder,
856#endif
857
Christoph Hellwig8c4ed632008-10-30 16:55:13 +1100858#ifdef XFS_BTREE_TRACE
859 .trace_enter = xfs_bmbt_trace_enter,
860 .trace_cursor = xfs_bmbt_trace_cursor,
861 .trace_key = xfs_bmbt_trace_key,
862 .trace_record = xfs_bmbt_trace_record,
863#endif
Christoph Hellwig561f7d12008-10-30 16:53:59 +1100864};
865
866/*
867 * Allocate a new bmap btree cursor.
868 */
869struct xfs_btree_cur * /* new bmap btree cursor */
870xfs_bmbt_init_cursor(
871 struct xfs_mount *mp, /* file system mount point */
872 struct xfs_trans *tp, /* transaction pointer */
873 struct xfs_inode *ip, /* inode owning the btree */
874 int whichfork) /* data or attr fork */
875{
876 struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
877 struct xfs_btree_cur *cur;
878
879 cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_SLEEP);
880
881 cur->bc_tp = tp;
882 cur->bc_mp = mp;
883 cur->bc_nlevels = be16_to_cpu(ifp->if_broot->bb_level) + 1;
884 cur->bc_btnum = XFS_BTNUM_BMAP;
885 cur->bc_blocklog = mp->m_sb.sb_blocklog;
886
887 cur->bc_ops = &xfs_bmbt_ops;
Christoph Hellwige99ab902008-10-30 16:54:33 +1100888 cur->bc_flags = XFS_BTREE_LONG_PTRS | XFS_BTREE_ROOT_IN_INODE;
Christoph Hellwig561f7d12008-10-30 16:53:59 +1100889
890 cur->bc_private.b.forksize = XFS_IFORK_SIZE(ip, whichfork);
891 cur->bc_private.b.ip = ip;
892 cur->bc_private.b.firstblock = NULLFSBLOCK;
893 cur->bc_private.b.flist = NULL;
894 cur->bc_private.b.allocated = 0;
895 cur->bc_private.b.flags = 0;
896 cur->bc_private.b.whichfork = whichfork;
897
898 return cur;
899}
Christoph Hellwig60197e82008-10-30 17:11:19 +1100900
901/*
902 * Calculate number of records in a bmap btree block.
903 */
904int
905xfs_bmbt_maxrecs(
906 struct xfs_mount *mp,
907 int blocklen,
908 int leaf)
909{
Christoph Hellwig7cc95a82008-10-30 17:14:34 +1100910 blocklen -= XFS_BMBT_BLOCK_LEN(mp);
Christoph Hellwig60197e82008-10-30 17:11:19 +1100911
912 if (leaf)
913 return blocklen / sizeof(xfs_bmbt_rec_t);
914 return blocklen / (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t));
915}
916
917/*
918 * Calculate number of records in a bmap btree inode root.
919 */
920int
921xfs_bmdr_maxrecs(
922 struct xfs_mount *mp,
923 int blocklen,
924 int leaf)
925{
926 blocklen -= sizeof(xfs_bmdr_block_t);
927
928 if (leaf)
929 return blocklen / sizeof(xfs_bmdr_rec_t);
930 return blocklen / (sizeof(xfs_bmdr_key_t) + sizeof(xfs_bmdr_ptr_t));
931}