blob: e2f5d59cbeaff59470f025ba79305b6f53e3316d [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_mount.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include "xfs_bmap_btree.h"
Nathan Scotta844f452005-11-02 14:38:42 +110029#include "xfs_alloc_btree.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070030#include "xfs_ialloc_btree.h"
Nathan Scotta844f452005-11-02 14:38:42 +110031#include "xfs_dinode.h"
32#include "xfs_inode.h"
33#include "xfs_inode_item.h"
34#include "xfs_alloc.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#include "xfs_btree.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include "xfs_itable.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070037#include "xfs_bmap.h"
38#include "xfs_error.h"
39#include "xfs_quota.h"
40
Linus Torvalds1da177e2005-04-16 15:20:36 -070041/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070042 * Determine the extent state.
43 */
44/* ARGSUSED */
45STATIC xfs_exntst_t
46xfs_extent_state(
47 xfs_filblks_t blks,
48 int extent_flag)
49{
50 if (extent_flag) {
51 ASSERT(blks != 0); /* saved for DMIG */
52 return XFS_EXT_UNWRITTEN;
53 }
54 return XFS_EXT_NORM;
55}
56
Linus Torvalds1da177e2005-04-16 15:20:36 -070057/*
58 * Convert on-disk form of btree root to in-memory form.
59 */
60void
61xfs_bmdr_to_bmbt(
Christoph Hellwig60197e82008-10-30 17:11:19 +110062 struct xfs_mount *mp,
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 xfs_bmdr_block_t *dblock,
64 int dblocklen,
Christoph Hellwig7cc95a82008-10-30 17:14:34 +110065 struct xfs_btree_block *rblock,
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 int rblocklen)
67{
68 int dmxr;
69 xfs_bmbt_key_t *fkp;
Christoph Hellwig576039c2006-09-28 10:58:06 +100070 __be64 *fpp;
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 xfs_bmbt_key_t *tkp;
Christoph Hellwig576039c2006-09-28 10:58:06 +100072 __be64 *tpp;
Linus Torvalds1da177e2005-04-16 15:20:36 -070073
Christoph Hellwig16259e72005-11-02 15:11:25 +110074 rblock->bb_magic = cpu_to_be32(XFS_BMAP_MAGIC);
75 rblock->bb_level = dblock->bb_level;
76 ASSERT(be16_to_cpu(rblock->bb_level) > 0);
77 rblock->bb_numrecs = dblock->bb_numrecs;
Christoph Hellwig7cc95a82008-10-30 17:14:34 +110078 rblock->bb_u.l.bb_leftsib = cpu_to_be64(NULLDFSBNO);
79 rblock->bb_u.l.bb_rightsib = cpu_to_be64(NULLDFSBNO);
Christoph Hellwig60197e82008-10-30 17:11:19 +110080 dmxr = xfs_bmdr_maxrecs(mp, dblocklen, 0);
Christoph Hellwig136341b2008-10-30 17:11:40 +110081 fkp = XFS_BMDR_KEY_ADDR(dblock, 1);
82 tkp = XFS_BMBT_KEY_ADDR(mp, rblock, 1);
83 fpp = XFS_BMDR_PTR_ADDR(dblock, 1, dmxr);
Christoph Hellwig60197e82008-10-30 17:11:19 +110084 tpp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, rblocklen);
Christoph Hellwig16259e72005-11-02 15:11:25 +110085 dmxr = be16_to_cpu(dblock->bb_numrecs);
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 memcpy(tkp, fkp, sizeof(*fkp) * dmxr);
Christoph Hellwig576039c2006-09-28 10:58:06 +100087 memcpy(tpp, fpp, sizeof(*fpp) * dmxr);
Linus Torvalds1da177e2005-04-16 15:20:36 -070088}
89
90/*
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 * Convert a compressed bmap extent record to an uncompressed form.
92 * This code must be in sync with the routines xfs_bmbt_get_startoff,
93 * xfs_bmbt_get_startblock, xfs_bmbt_get_blockcount and xfs_bmbt_get_state.
94 */
Christoph Hellwigb8f82a42009-11-14 16:17:22 +000095STATIC void
Linus Torvalds1da177e2005-04-16 15:20:36 -070096__xfs_bmbt_get_all(
97 __uint64_t l0,
98 __uint64_t l1,
99 xfs_bmbt_irec_t *s)
100{
101 int ext_flag;
102 xfs_exntst_t st;
103
104 ext_flag = (int)(l0 >> (64 - BMBT_EXNTFLAG_BITLEN));
105 s->br_startoff = ((xfs_fileoff_t)l0 &
Eric Sandeenfb825572009-01-09 15:53:54 +1100106 xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107#if XFS_BIG_BLKNOS
Eric Sandeenfb825572009-01-09 15:53:54 +1100108 s->br_startblock = (((xfs_fsblock_t)l0 & xfs_mask64lo(9)) << 43) |
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 (((xfs_fsblock_t)l1) >> 21);
110#else
111#ifdef DEBUG
112 {
113 xfs_dfsbno_t b;
114
Eric Sandeenfb825572009-01-09 15:53:54 +1100115 b = (((xfs_dfsbno_t)l0 & xfs_mask64lo(9)) << 43) |
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 (((xfs_dfsbno_t)l1) >> 21);
Eric Sandeen9d87c312009-01-14 23:22:07 -0600117 ASSERT((b >> 32) == 0 || isnulldstartblock(b));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 s->br_startblock = (xfs_fsblock_t)b;
119 }
120#else /* !DEBUG */
121 s->br_startblock = (xfs_fsblock_t)(((xfs_dfsbno_t)l1) >> 21);
122#endif /* DEBUG */
123#endif /* XFS_BIG_BLKNOS */
Eric Sandeenfb825572009-01-09 15:53:54 +1100124 s->br_blockcount = (xfs_filblks_t)(l1 & xfs_mask64lo(21));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125 /* This is xfs_extent_state() in-line */
126 if (ext_flag) {
127 ASSERT(s->br_blockcount != 0); /* saved for DMIG */
128 st = XFS_EXT_UNWRITTEN;
129 } else
130 st = XFS_EXT_NORM;
131 s->br_state = st;
132}
133
134void
135xfs_bmbt_get_all(
Christoph Hellwiga6f64d42007-08-16 16:23:40 +1000136 xfs_bmbt_rec_host_t *r,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 xfs_bmbt_irec_t *s)
138{
139 __xfs_bmbt_get_all(r->l0, r->l1, s);
140}
141
142/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 * Extract the blockcount field from an in memory bmap extent record.
144 */
145xfs_filblks_t
146xfs_bmbt_get_blockcount(
Christoph Hellwiga6f64d42007-08-16 16:23:40 +1000147 xfs_bmbt_rec_host_t *r)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148{
Eric Sandeenfb825572009-01-09 15:53:54 +1100149 return (xfs_filblks_t)(r->l1 & xfs_mask64lo(21));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150}
151
152/*
153 * Extract the startblock field from an in memory bmap extent record.
154 */
155xfs_fsblock_t
156xfs_bmbt_get_startblock(
Christoph Hellwiga6f64d42007-08-16 16:23:40 +1000157 xfs_bmbt_rec_host_t *r)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158{
159#if XFS_BIG_BLKNOS
Eric Sandeenfb825572009-01-09 15:53:54 +1100160 return (((xfs_fsblock_t)r->l0 & xfs_mask64lo(9)) << 43) |
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 (((xfs_fsblock_t)r->l1) >> 21);
162#else
163#ifdef DEBUG
164 xfs_dfsbno_t b;
165
Eric Sandeenfb825572009-01-09 15:53:54 +1100166 b = (((xfs_dfsbno_t)r->l0 & xfs_mask64lo(9)) << 43) |
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 (((xfs_dfsbno_t)r->l1) >> 21);
Eric Sandeen9d87c312009-01-14 23:22:07 -0600168 ASSERT((b >> 32) == 0 || isnulldstartblock(b));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 return (xfs_fsblock_t)b;
170#else /* !DEBUG */
171 return (xfs_fsblock_t)(((xfs_dfsbno_t)r->l1) >> 21);
172#endif /* DEBUG */
173#endif /* XFS_BIG_BLKNOS */
174}
175
176/*
177 * Extract the startoff field from an in memory bmap extent record.
178 */
179xfs_fileoff_t
180xfs_bmbt_get_startoff(
Christoph Hellwiga6f64d42007-08-16 16:23:40 +1000181 xfs_bmbt_rec_host_t *r)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182{
183 return ((xfs_fileoff_t)r->l0 &
Eric Sandeenfb825572009-01-09 15:53:54 +1100184 xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185}
186
187xfs_exntst_t
188xfs_bmbt_get_state(
Christoph Hellwiga6f64d42007-08-16 16:23:40 +1000189 xfs_bmbt_rec_host_t *r)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190{
191 int ext_flag;
192
193 ext_flag = (int)((r->l0) >> (64 - BMBT_EXNTFLAG_BITLEN));
194 return xfs_extent_state(xfs_bmbt_get_blockcount(r),
195 ext_flag);
196}
197
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198/*
199 * Extract the blockcount field from an on disk bmap extent record.
200 */
201xfs_filblks_t
202xfs_bmbt_disk_get_blockcount(
203 xfs_bmbt_rec_t *r)
204{
Eric Sandeenfb825572009-01-09 15:53:54 +1100205 return (xfs_filblks_t)(be64_to_cpu(r->l1) & xfs_mask64lo(21));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206}
207
208/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 * Extract the startoff field from a disk format bmap extent record.
210 */
211xfs_fileoff_t
212xfs_bmbt_disk_get_startoff(
213 xfs_bmbt_rec_t *r)
214{
Christoph Hellwigcd8b0a92007-08-16 16:24:15 +1000215 return ((xfs_fileoff_t)be64_to_cpu(r->l0) &
Eric Sandeenfb825572009-01-09 15:53:54 +1100216 xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220/*
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000221 * Set all the fields in a bmap extent record from the arguments.
222 */
223void
224xfs_bmbt_set_allf(
225 xfs_bmbt_rec_host_t *r,
226 xfs_fileoff_t startoff,
227 xfs_fsblock_t startblock,
228 xfs_filblks_t blockcount,
229 xfs_exntst_t state)
230{
231 int extent_flag = (state == XFS_EXT_NORM) ? 0 : 1;
232
233 ASSERT(state == XFS_EXT_NORM || state == XFS_EXT_UNWRITTEN);
Eric Sandeenfb825572009-01-09 15:53:54 +1100234 ASSERT((startoff & xfs_mask64hi(64-BMBT_STARTOFF_BITLEN)) == 0);
235 ASSERT((blockcount & xfs_mask64hi(64-BMBT_BLOCKCOUNT_BITLEN)) == 0);
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000236
237#if XFS_BIG_BLKNOS
Eric Sandeenfb825572009-01-09 15:53:54 +1100238 ASSERT((startblock & xfs_mask64hi(64-BMBT_STARTBLOCK_BITLEN)) == 0);
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000239
240 r->l0 = ((xfs_bmbt_rec_base_t)extent_flag << 63) |
241 ((xfs_bmbt_rec_base_t)startoff << 9) |
242 ((xfs_bmbt_rec_base_t)startblock >> 43);
243 r->l1 = ((xfs_bmbt_rec_base_t)startblock << 21) |
244 ((xfs_bmbt_rec_base_t)blockcount &
Eric Sandeenfb825572009-01-09 15:53:54 +1100245 (xfs_bmbt_rec_base_t)xfs_mask64lo(21));
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000246#else /* !XFS_BIG_BLKNOS */
Eric Sandeen9d87c312009-01-14 23:22:07 -0600247 if (isnullstartblock(startblock)) {
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000248 r->l0 = ((xfs_bmbt_rec_base_t)extent_flag << 63) |
249 ((xfs_bmbt_rec_base_t)startoff << 9) |
Eric Sandeenfb825572009-01-09 15:53:54 +1100250 (xfs_bmbt_rec_base_t)xfs_mask64lo(9);
251 r->l1 = xfs_mask64hi(11) |
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000252 ((xfs_bmbt_rec_base_t)startblock << 21) |
253 ((xfs_bmbt_rec_base_t)blockcount &
Eric Sandeenfb825572009-01-09 15:53:54 +1100254 (xfs_bmbt_rec_base_t)xfs_mask64lo(21));
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000255 } else {
256 r->l0 = ((xfs_bmbt_rec_base_t)extent_flag << 63) |
257 ((xfs_bmbt_rec_base_t)startoff << 9);
258 r->l1 = ((xfs_bmbt_rec_base_t)startblock << 21) |
259 ((xfs_bmbt_rec_base_t)blockcount &
Eric Sandeenfb825572009-01-09 15:53:54 +1100260 (xfs_bmbt_rec_base_t)xfs_mask64lo(21));
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000261 }
262#endif /* XFS_BIG_BLKNOS */
263}
264
265/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 * Set all the fields in a bmap extent record from the uncompressed form.
267 */
268void
269xfs_bmbt_set_all(
Christoph Hellwiga6f64d42007-08-16 16:23:40 +1000270 xfs_bmbt_rec_host_t *r,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 xfs_bmbt_irec_t *s)
272{
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000273 xfs_bmbt_set_allf(r, s->br_startoff, s->br_startblock,
274 s->br_blockcount, s->br_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275}
276
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278/*
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000279 * Set all the fields in a disk format bmap extent record from the arguments.
280 */
281void
282xfs_bmbt_disk_set_allf(
283 xfs_bmbt_rec_t *r,
284 xfs_fileoff_t startoff,
285 xfs_fsblock_t startblock,
286 xfs_filblks_t blockcount,
287 xfs_exntst_t state)
288{
289 int extent_flag = (state == XFS_EXT_NORM) ? 0 : 1;
290
291 ASSERT(state == XFS_EXT_NORM || state == XFS_EXT_UNWRITTEN);
Eric Sandeenfb825572009-01-09 15:53:54 +1100292 ASSERT((startoff & xfs_mask64hi(64-BMBT_STARTOFF_BITLEN)) == 0);
293 ASSERT((blockcount & xfs_mask64hi(64-BMBT_BLOCKCOUNT_BITLEN)) == 0);
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000294
295#if XFS_BIG_BLKNOS
Eric Sandeenfb825572009-01-09 15:53:54 +1100296 ASSERT((startblock & xfs_mask64hi(64-BMBT_STARTBLOCK_BITLEN)) == 0);
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000297
Christoph Hellwigcd8b0a92007-08-16 16:24:15 +1000298 r->l0 = cpu_to_be64(
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000299 ((xfs_bmbt_rec_base_t)extent_flag << 63) |
300 ((xfs_bmbt_rec_base_t)startoff << 9) |
301 ((xfs_bmbt_rec_base_t)startblock >> 43));
Christoph Hellwigcd8b0a92007-08-16 16:24:15 +1000302 r->l1 = cpu_to_be64(
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000303 ((xfs_bmbt_rec_base_t)startblock << 21) |
304 ((xfs_bmbt_rec_base_t)blockcount &
Eric Sandeenfb825572009-01-09 15:53:54 +1100305 (xfs_bmbt_rec_base_t)xfs_mask64lo(21)));
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000306#else /* !XFS_BIG_BLKNOS */
Eric Sandeen9d87c312009-01-14 23:22:07 -0600307 if (isnullstartblock(startblock)) {
Christoph Hellwigcd8b0a92007-08-16 16:24:15 +1000308 r->l0 = cpu_to_be64(
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000309 ((xfs_bmbt_rec_base_t)extent_flag << 63) |
310 ((xfs_bmbt_rec_base_t)startoff << 9) |
Eric Sandeenfb825572009-01-09 15:53:54 +1100311 (xfs_bmbt_rec_base_t)xfs_mask64lo(9));
312 r->l1 = cpu_to_be64(xfs_mask64hi(11) |
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000313 ((xfs_bmbt_rec_base_t)startblock << 21) |
314 ((xfs_bmbt_rec_base_t)blockcount &
Eric Sandeenfb825572009-01-09 15:53:54 +1100315 (xfs_bmbt_rec_base_t)xfs_mask64lo(21)));
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000316 } else {
Christoph Hellwigcd8b0a92007-08-16 16:24:15 +1000317 r->l0 = cpu_to_be64(
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000318 ((xfs_bmbt_rec_base_t)extent_flag << 63) |
319 ((xfs_bmbt_rec_base_t)startoff << 9));
Christoph Hellwigcd8b0a92007-08-16 16:24:15 +1000320 r->l1 = cpu_to_be64(
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000321 ((xfs_bmbt_rec_base_t)startblock << 21) |
322 ((xfs_bmbt_rec_base_t)blockcount &
Eric Sandeenfb825572009-01-09 15:53:54 +1100323 (xfs_bmbt_rec_base_t)xfs_mask64lo(21)));
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000324 }
325#endif /* XFS_BIG_BLKNOS */
326}
327
328/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 * Set all the fields in a bmap extent record from the uncompressed form.
330 */
Eric Sandeen5d77c0d2009-11-19 15:52:00 +0000331STATIC void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332xfs_bmbt_disk_set_all(
333 xfs_bmbt_rec_t *r,
334 xfs_bmbt_irec_t *s)
335{
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000336 xfs_bmbt_disk_set_allf(r, s->br_startoff, s->br_startblock,
337 s->br_blockcount, s->br_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339
340/*
341 * Set the blockcount field in a bmap extent record.
342 */
343void
344xfs_bmbt_set_blockcount(
Christoph Hellwiga6f64d42007-08-16 16:23:40 +1000345 xfs_bmbt_rec_host_t *r,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 xfs_filblks_t v)
347{
Eric Sandeenfb825572009-01-09 15:53:54 +1100348 ASSERT((v & xfs_mask64hi(43)) == 0);
349 r->l1 = (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64hi(43)) |
350 (xfs_bmbt_rec_base_t)(v & xfs_mask64lo(21));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351}
352
353/*
354 * Set the startblock field in a bmap extent record.
355 */
356void
357xfs_bmbt_set_startblock(
Christoph Hellwiga6f64d42007-08-16 16:23:40 +1000358 xfs_bmbt_rec_host_t *r,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 xfs_fsblock_t v)
360{
361#if XFS_BIG_BLKNOS
Eric Sandeenfb825572009-01-09 15:53:54 +1100362 ASSERT((v & xfs_mask64hi(12)) == 0);
363 r->l0 = (r->l0 & (xfs_bmbt_rec_base_t)xfs_mask64hi(55)) |
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 (xfs_bmbt_rec_base_t)(v >> 43);
Eric Sandeenfb825572009-01-09 15:53:54 +1100365 r->l1 = (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64lo(21)) |
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 (xfs_bmbt_rec_base_t)(v << 21);
367#else /* !XFS_BIG_BLKNOS */
Eric Sandeen9d87c312009-01-14 23:22:07 -0600368 if (isnullstartblock(v)) {
Eric Sandeenfb825572009-01-09 15:53:54 +1100369 r->l0 |= (xfs_bmbt_rec_base_t)xfs_mask64lo(9);
370 r->l1 = (xfs_bmbt_rec_base_t)xfs_mask64hi(11) |
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371 ((xfs_bmbt_rec_base_t)v << 21) |
Eric Sandeenfb825572009-01-09 15:53:54 +1100372 (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64lo(21));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 } else {
Eric Sandeenfb825572009-01-09 15:53:54 +1100374 r->l0 &= ~(xfs_bmbt_rec_base_t)xfs_mask64lo(9);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 r->l1 = ((xfs_bmbt_rec_base_t)v << 21) |
Eric Sandeenfb825572009-01-09 15:53:54 +1100376 (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64lo(21));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 }
378#endif /* XFS_BIG_BLKNOS */
379}
380
381/*
382 * Set the startoff field in a bmap extent record.
383 */
384void
385xfs_bmbt_set_startoff(
Christoph Hellwiga6f64d42007-08-16 16:23:40 +1000386 xfs_bmbt_rec_host_t *r,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 xfs_fileoff_t v)
388{
Eric Sandeenfb825572009-01-09 15:53:54 +1100389 ASSERT((v & xfs_mask64hi(9)) == 0);
390 r->l0 = (r->l0 & (xfs_bmbt_rec_base_t) xfs_mask64hi(1)) |
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 ((xfs_bmbt_rec_base_t)v << 9) |
Eric Sandeenfb825572009-01-09 15:53:54 +1100392 (r->l0 & (xfs_bmbt_rec_base_t)xfs_mask64lo(9));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393}
394
395/*
396 * Set the extent state field in a bmap extent record.
397 */
398void
399xfs_bmbt_set_state(
Christoph Hellwiga6f64d42007-08-16 16:23:40 +1000400 xfs_bmbt_rec_host_t *r,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 xfs_exntst_t v)
402{
403 ASSERT(v == XFS_EXT_NORM || v == XFS_EXT_UNWRITTEN);
404 if (v == XFS_EXT_NORM)
Eric Sandeenfb825572009-01-09 15:53:54 +1100405 r->l0 &= xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 else
Eric Sandeenfb825572009-01-09 15:53:54 +1100407 r->l0 |= xfs_mask64hi(BMBT_EXNTFLAG_BITLEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408}
409
410/*
411 * Convert in-memory form of btree root to on-disk form.
412 */
413void
414xfs_bmbt_to_bmdr(
Christoph Hellwig60197e82008-10-30 17:11:19 +1100415 struct xfs_mount *mp,
Christoph Hellwig7cc95a82008-10-30 17:14:34 +1100416 struct xfs_btree_block *rblock,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 int rblocklen,
418 xfs_bmdr_block_t *dblock,
419 int dblocklen)
420{
421 int dmxr;
422 xfs_bmbt_key_t *fkp;
Christoph Hellwig576039c2006-09-28 10:58:06 +1000423 __be64 *fpp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 xfs_bmbt_key_t *tkp;
Christoph Hellwig576039c2006-09-28 10:58:06 +1000425 __be64 *tpp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426
Christoph Hellwig69ef9212011-07-08 14:36:05 +0200427 ASSERT(rblock->bb_magic == cpu_to_be32(XFS_BMAP_MAGIC));
428 ASSERT(rblock->bb_u.l.bb_leftsib == cpu_to_be64(NULLDFSBNO));
429 ASSERT(rblock->bb_u.l.bb_rightsib == cpu_to_be64(NULLDFSBNO));
430 ASSERT(rblock->bb_level != 0);
Christoph Hellwig16259e72005-11-02 15:11:25 +1100431 dblock->bb_level = rblock->bb_level;
432 dblock->bb_numrecs = rblock->bb_numrecs;
Christoph Hellwig60197e82008-10-30 17:11:19 +1100433 dmxr = xfs_bmdr_maxrecs(mp, dblocklen, 0);
Christoph Hellwig136341b2008-10-30 17:11:40 +1100434 fkp = XFS_BMBT_KEY_ADDR(mp, rblock, 1);
435 tkp = XFS_BMDR_KEY_ADDR(dblock, 1);
Christoph Hellwig60197e82008-10-30 17:11:19 +1100436 fpp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, rblocklen);
Christoph Hellwig136341b2008-10-30 17:11:40 +1100437 tpp = XFS_BMDR_PTR_ADDR(dblock, 1, dmxr);
Christoph Hellwig16259e72005-11-02 15:11:25 +1100438 dmxr = be16_to_cpu(dblock->bb_numrecs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700439 memcpy(tkp, fkp, sizeof(*fkp) * dmxr);
Christoph Hellwig576039c2006-09-28 10:58:06 +1000440 memcpy(tpp, fpp, sizeof(*fpp) * dmxr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441}
442
443/*
Mandy Kirkconnell4eea22f2006-03-14 13:29:52 +1100444 * Check extent records, which have just been read, for
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 * any bit in the extent flag field. ASSERT on debug
446 * kernels, as this condition should not occur.
447 * Return an error condition (1) if any flags found,
448 * otherwise return 0.
449 */
450
451int
452xfs_check_nostate_extents(
Mandy Kirkconnell4eea22f2006-03-14 13:29:52 +1100453 xfs_ifork_t *ifp,
454 xfs_extnum_t idx,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 xfs_extnum_t num)
456{
Mandy Kirkconnell4eea22f2006-03-14 13:29:52 +1100457 for (; num > 0; num--, idx++) {
Christoph Hellwiga6f64d42007-08-16 16:23:40 +1000458 xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, idx);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 if ((ep->l0 >>
460 (64 - BMBT_EXNTFLAG_BITLEN)) != 0) {
461 ASSERT(0);
462 return 1;
463 }
464 }
465 return 0;
466}
Christoph Hellwig561f7d12008-10-30 16:53:59 +1100467
468
469STATIC struct xfs_btree_cur *
470xfs_bmbt_dup_cursor(
471 struct xfs_btree_cur *cur)
472{
473 struct xfs_btree_cur *new;
474
475 new = xfs_bmbt_init_cursor(cur->bc_mp, cur->bc_tp,
476 cur->bc_private.b.ip, cur->bc_private.b.whichfork);
477
478 /*
479 * Copy the firstblock, flist, and flags values,
480 * since init cursor doesn't get them.
481 */
482 new->bc_private.b.firstblock = cur->bc_private.b.firstblock;
483 new->bc_private.b.flist = cur->bc_private.b.flist;
484 new->bc_private.b.flags = cur->bc_private.b.flags;
485
486 return new;
487}
488
Christoph Hellwig4b22a572008-10-30 16:57:40 +1100489STATIC void
490xfs_bmbt_update_cursor(
491 struct xfs_btree_cur *src,
492 struct xfs_btree_cur *dst)
493{
494 ASSERT((dst->bc_private.b.firstblock != NULLFSBLOCK) ||
495 (dst->bc_private.b.ip->i_d.di_flags & XFS_DIFLAG_REALTIME));
496 ASSERT(dst->bc_private.b.flist == src->bc_private.b.flist);
497
498 dst->bc_private.b.allocated += src->bc_private.b.allocated;
499 dst->bc_private.b.firstblock = src->bc_private.b.firstblock;
500
501 src->bc_private.b.allocated = 0;
502}
503
Christoph Hellwigce5e42d2008-10-30 16:55:23 +1100504STATIC int
Christoph Hellwigf5eb8e72008-10-30 16:57:03 +1100505xfs_bmbt_alloc_block(
506 struct xfs_btree_cur *cur,
507 union xfs_btree_ptr *start,
508 union xfs_btree_ptr *new,
509 int length,
510 int *stat)
511{
512 xfs_alloc_arg_t args; /* block allocation args */
513 int error; /* error return value */
514
515 memset(&args, 0, sizeof(args));
516 args.tp = cur->bc_tp;
517 args.mp = cur->bc_mp;
518 args.fsbno = cur->bc_private.b.firstblock;
519 args.firstblock = args.fsbno;
520
521 if (args.fsbno == NULLFSBLOCK) {
522 args.fsbno = be64_to_cpu(start->l);
523 args.type = XFS_ALLOCTYPE_START_BNO;
524 /*
525 * Make sure there is sufficient room left in the AG to
526 * complete a full tree split for an extent insert. If
527 * we are converting the middle part of an extent then
528 * we may need space for two tree splits.
529 *
530 * We are relying on the caller to make the correct block
531 * reservation for this operation to succeed. If the
532 * reservation amount is insufficient then we may fail a
533 * block allocation here and corrupt the filesystem.
534 */
535 args.minleft = xfs_trans_get_block_res(args.tp);
536 } else if (cur->bc_private.b.flist->xbf_low) {
537 args.type = XFS_ALLOCTYPE_START_BNO;
538 } else {
539 args.type = XFS_ALLOCTYPE_NEAR_BNO;
540 }
541
542 args.minlen = args.maxlen = args.prod = 1;
543 args.wasdel = cur->bc_private.b.flags & XFS_BTCUR_BPRV_WASDEL;
544 if (!args.wasdel && xfs_trans_get_block_res(args.tp) == 0) {
545 error = XFS_ERROR(ENOSPC);
546 goto error0;
547 }
548 error = xfs_alloc_vextent(&args);
549 if (error)
550 goto error0;
551
552 if (args.fsbno == NULLFSBLOCK && args.minleft) {
553 /*
554 * Could not find an AG with enough free space to satisfy
555 * a full btree split. Try again without minleft and if
556 * successful activate the lowspace algorithm.
557 */
558 args.fsbno = 0;
559 args.type = XFS_ALLOCTYPE_FIRST_AG;
560 args.minleft = 0;
561 error = xfs_alloc_vextent(&args);
562 if (error)
563 goto error0;
564 cur->bc_private.b.flist->xbf_low = 1;
565 }
566 if (args.fsbno == NULLFSBLOCK) {
567 XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
568 *stat = 0;
569 return 0;
570 }
571 ASSERT(args.len == 1);
572 cur->bc_private.b.firstblock = args.fsbno;
573 cur->bc_private.b.allocated++;
574 cur->bc_private.b.ip->i_d.di_nblocks++;
575 xfs_trans_log_inode(args.tp, cur->bc_private.b.ip, XFS_ILOG_CORE);
Christoph Hellwig7d095252009-06-08 15:33:32 +0200576 xfs_trans_mod_dquot_byino(args.tp, cur->bc_private.b.ip,
Christoph Hellwigf5eb8e72008-10-30 16:57:03 +1100577 XFS_TRANS_DQ_BCOUNT, 1L);
578
579 new->l = cpu_to_be64(args.fsbno);
580
581 XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
582 *stat = 1;
583 return 0;
584
585 error0:
586 XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
587 return error;
588}
589
590STATIC int
Christoph Hellwigd4b3a4b2008-10-30 16:57:51 +1100591xfs_bmbt_free_block(
592 struct xfs_btree_cur *cur,
593 struct xfs_buf *bp)
594{
595 struct xfs_mount *mp = cur->bc_mp;
596 struct xfs_inode *ip = cur->bc_private.b.ip;
597 struct xfs_trans *tp = cur->bc_tp;
598 xfs_fsblock_t fsbno = XFS_DADDR_TO_FSB(mp, XFS_BUF_ADDR(bp));
599
600 xfs_bmap_add_free(fsbno, 1, cur->bc_private.b.flist, mp);
601 ip->i_d.di_nblocks--;
602
603 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
Christoph Hellwig7d095252009-06-08 15:33:32 +0200604 xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
Christoph Hellwigd4b3a4b2008-10-30 16:57:51 +1100605 xfs_trans_binval(tp, bp);
606 return 0;
607}
608
609STATIC int
Christoph Hellwig91cca5df2008-10-30 16:58:01 +1100610xfs_bmbt_get_minrecs(
611 struct xfs_btree_cur *cur,
612 int level)
613{
Christoph Hellwig60197e82008-10-30 17:11:19 +1100614 if (level == cur->bc_nlevels - 1) {
615 struct xfs_ifork *ifp;
616
617 ifp = XFS_IFORK_PTR(cur->bc_private.b.ip,
618 cur->bc_private.b.whichfork);
619
620 return xfs_bmbt_maxrecs(cur->bc_mp,
621 ifp->if_broot_bytes, level == 0) / 2;
622 }
623
624 return cur->bc_mp->m_bmap_dmnr[level != 0];
Christoph Hellwig91cca5df2008-10-30 16:58:01 +1100625}
626
Christoph Hellwig60197e82008-10-30 17:11:19 +1100627int
Christoph Hellwigce5e42d2008-10-30 16:55:23 +1100628xfs_bmbt_get_maxrecs(
629 struct xfs_btree_cur *cur,
630 int level)
631{
Christoph Hellwig60197e82008-10-30 17:11:19 +1100632 if (level == cur->bc_nlevels - 1) {
633 struct xfs_ifork *ifp;
634
635 ifp = XFS_IFORK_PTR(cur->bc_private.b.ip,
636 cur->bc_private.b.whichfork);
637
638 return xfs_bmbt_maxrecs(cur->bc_mp,
639 ifp->if_broot_bytes, level == 0);
640 }
641
642 return cur->bc_mp->m_bmap_dmxr[level != 0];
643
Christoph Hellwigce5e42d2008-10-30 16:55:23 +1100644}
645
Christoph Hellwig4b22a572008-10-30 16:57:40 +1100646/*
647 * Get the maximum records we could store in the on-disk format.
648 *
649 * For non-root nodes this is equivalent to xfs_bmbt_get_maxrecs, but
650 * for the root node this checks the available space in the dinode fork
651 * so that we can resize the in-memory buffer to match it. After a
652 * resize to the maximum size this function returns the same value
653 * as xfs_bmbt_get_maxrecs for the root node, too.
654 */
655STATIC int
656xfs_bmbt_get_dmaxrecs(
657 struct xfs_btree_cur *cur,
658 int level)
659{
Christoph Hellwig60197e82008-10-30 17:11:19 +1100660 if (level != cur->bc_nlevels - 1)
661 return cur->bc_mp->m_bmap_dmxr[level != 0];
662 return xfs_bmdr_maxrecs(cur->bc_mp, cur->bc_private.b.forksize,
663 level == 0);
Christoph Hellwig4b22a572008-10-30 16:57:40 +1100664}
665
Christoph Hellwigfe033cc2008-10-30 16:56:09 +1100666STATIC void
667xfs_bmbt_init_key_from_rec(
668 union xfs_btree_key *key,
669 union xfs_btree_rec *rec)
670{
671 key->bmbt.br_startoff =
672 cpu_to_be64(xfs_bmbt_disk_get_startoff(&rec->bmbt));
673}
674
675STATIC void
Christoph Hellwig4b22a572008-10-30 16:57:40 +1100676xfs_bmbt_init_rec_from_key(
677 union xfs_btree_key *key,
678 union xfs_btree_rec *rec)
679{
680 ASSERT(key->bmbt.br_startoff != 0);
681
682 xfs_bmbt_disk_set_allf(&rec->bmbt, be64_to_cpu(key->bmbt.br_startoff),
683 0, 0, XFS_EXT_NORM);
684}
685
686STATIC void
687xfs_bmbt_init_rec_from_cur(
688 struct xfs_btree_cur *cur,
689 union xfs_btree_rec *rec)
690{
691 xfs_bmbt_disk_set_all(&rec->bmbt, &cur->bc_rec.b);
692}
693
694STATIC void
Christoph Hellwigfe033cc2008-10-30 16:56:09 +1100695xfs_bmbt_init_ptr_from_cur(
696 struct xfs_btree_cur *cur,
697 union xfs_btree_ptr *ptr)
698{
699 ptr->l = 0;
700}
701
702STATIC __int64_t
703xfs_bmbt_key_diff(
704 struct xfs_btree_cur *cur,
705 union xfs_btree_key *key)
706{
707 return (__int64_t)be64_to_cpu(key->bmbt.br_startoff) -
708 cur->bc_rec.b.br_startoff;
709}
710
Christoph Hellwig4a26e662008-10-30 16:58:32 +1100711#ifdef DEBUG
712STATIC int
713xfs_bmbt_keys_inorder(
714 struct xfs_btree_cur *cur,
715 union xfs_btree_key *k1,
716 union xfs_btree_key *k2)
717{
718 return be64_to_cpu(k1->bmbt.br_startoff) <
719 be64_to_cpu(k2->bmbt.br_startoff);
720}
721
722STATIC int
723xfs_bmbt_recs_inorder(
724 struct xfs_btree_cur *cur,
725 union xfs_btree_rec *r1,
726 union xfs_btree_rec *r2)
727{
728 return xfs_bmbt_disk_get_startoff(&r1->bmbt) +
729 xfs_bmbt_disk_get_blockcount(&r1->bmbt) <=
730 xfs_bmbt_disk_get_startoff(&r2->bmbt);
731}
732#endif /* DEBUG */
733
Christoph Hellwig561f7d12008-10-30 16:53:59 +1100734static const struct xfs_btree_ops xfs_bmbt_ops = {
Christoph Hellwig65f1eae2008-10-30 16:55:34 +1100735 .rec_len = sizeof(xfs_bmbt_rec_t),
736 .key_len = sizeof(xfs_bmbt_key_t),
737
Christoph Hellwig561f7d12008-10-30 16:53:59 +1100738 .dup_cursor = xfs_bmbt_dup_cursor,
Christoph Hellwig4b22a572008-10-30 16:57:40 +1100739 .update_cursor = xfs_bmbt_update_cursor,
Christoph Hellwigf5eb8e72008-10-30 16:57:03 +1100740 .alloc_block = xfs_bmbt_alloc_block,
Christoph Hellwigd4b3a4b2008-10-30 16:57:51 +1100741 .free_block = xfs_bmbt_free_block,
Christoph Hellwigce5e42d2008-10-30 16:55:23 +1100742 .get_maxrecs = xfs_bmbt_get_maxrecs,
Christoph Hellwig91cca5df2008-10-30 16:58:01 +1100743 .get_minrecs = xfs_bmbt_get_minrecs,
Christoph Hellwig4b22a572008-10-30 16:57:40 +1100744 .get_dmaxrecs = xfs_bmbt_get_dmaxrecs,
Christoph Hellwigfe033cc2008-10-30 16:56:09 +1100745 .init_key_from_rec = xfs_bmbt_init_key_from_rec,
Christoph Hellwig4b22a572008-10-30 16:57:40 +1100746 .init_rec_from_key = xfs_bmbt_init_rec_from_key,
747 .init_rec_from_cur = xfs_bmbt_init_rec_from_cur,
Christoph Hellwigfe033cc2008-10-30 16:56:09 +1100748 .init_ptr_from_cur = xfs_bmbt_init_ptr_from_cur,
749 .key_diff = xfs_bmbt_key_diff,
Christoph Hellwig4a26e662008-10-30 16:58:32 +1100750#ifdef DEBUG
751 .keys_inorder = xfs_bmbt_keys_inorder,
752 .recs_inorder = xfs_bmbt_recs_inorder,
753#endif
Christoph Hellwig561f7d12008-10-30 16:53:59 +1100754};
755
756/*
757 * Allocate a new bmap btree cursor.
758 */
759struct xfs_btree_cur * /* new bmap btree cursor */
760xfs_bmbt_init_cursor(
761 struct xfs_mount *mp, /* file system mount point */
762 struct xfs_trans *tp, /* transaction pointer */
763 struct xfs_inode *ip, /* inode owning the btree */
764 int whichfork) /* data or attr fork */
765{
766 struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
767 struct xfs_btree_cur *cur;
768
769 cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_SLEEP);
770
771 cur->bc_tp = tp;
772 cur->bc_mp = mp;
773 cur->bc_nlevels = be16_to_cpu(ifp->if_broot->bb_level) + 1;
774 cur->bc_btnum = XFS_BTNUM_BMAP;
775 cur->bc_blocklog = mp->m_sb.sb_blocklog;
776
777 cur->bc_ops = &xfs_bmbt_ops;
Christoph Hellwige99ab902008-10-30 16:54:33 +1100778 cur->bc_flags = XFS_BTREE_LONG_PTRS | XFS_BTREE_ROOT_IN_INODE;
Christoph Hellwig561f7d12008-10-30 16:53:59 +1100779
780 cur->bc_private.b.forksize = XFS_IFORK_SIZE(ip, whichfork);
781 cur->bc_private.b.ip = ip;
782 cur->bc_private.b.firstblock = NULLFSBLOCK;
783 cur->bc_private.b.flist = NULL;
784 cur->bc_private.b.allocated = 0;
785 cur->bc_private.b.flags = 0;
786 cur->bc_private.b.whichfork = whichfork;
787
788 return cur;
789}
Christoph Hellwig60197e82008-10-30 17:11:19 +1100790
791/*
792 * Calculate number of records in a bmap btree block.
793 */
794int
795xfs_bmbt_maxrecs(
796 struct xfs_mount *mp,
797 int blocklen,
798 int leaf)
799{
Christoph Hellwig7cc95a82008-10-30 17:14:34 +1100800 blocklen -= XFS_BMBT_BLOCK_LEN(mp);
Christoph Hellwig60197e82008-10-30 17:11:19 +1100801
802 if (leaf)
803 return blocklen / sizeof(xfs_bmbt_rec_t);
804 return blocklen / (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t));
805}
806
807/*
808 * Calculate number of records in a bmap btree inode root.
809 */
810int
811xfs_bmdr_maxrecs(
812 struct xfs_mount *mp,
813 int blocklen,
814 int leaf)
815{
816 blocklen -= sizeof(xfs_bmdr_block_t);
817
818 if (leaf)
819 return blocklen / sizeof(xfs_bmdr_rec_t);
820 return blocklen / (sizeof(xfs_bmdr_key_t) + sizeof(xfs_bmdr_ptr_t));
821}