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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 */
Christoph Hellwigb8f82a42009-11-14 16:17:22 +0000101STATIC void
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102__xfs_bmbt_get_all(
103 __uint64_t l0,
104 __uint64_t l1,
105 xfs_bmbt_irec_t *s)
106{
107 int ext_flag;
108 xfs_exntst_t st;
109
110 ext_flag = (int)(l0 >> (64 - BMBT_EXNTFLAG_BITLEN));
111 s->br_startoff = ((xfs_fileoff_t)l0 &
Eric Sandeenfb825572009-01-09 15:53:54 +1100112 xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113#if XFS_BIG_BLKNOS
Eric Sandeenfb825572009-01-09 15:53:54 +1100114 s->br_startblock = (((xfs_fsblock_t)l0 & xfs_mask64lo(9)) << 43) |
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 (((xfs_fsblock_t)l1) >> 21);
116#else
117#ifdef DEBUG
118 {
119 xfs_dfsbno_t b;
120
Eric Sandeenfb825572009-01-09 15:53:54 +1100121 b = (((xfs_dfsbno_t)l0 & xfs_mask64lo(9)) << 43) |
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 (((xfs_dfsbno_t)l1) >> 21);
Eric Sandeen9d87c312009-01-14 23:22:07 -0600123 ASSERT((b >> 32) == 0 || isnulldstartblock(b));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 s->br_startblock = (xfs_fsblock_t)b;
125 }
126#else /* !DEBUG */
127 s->br_startblock = (xfs_fsblock_t)(((xfs_dfsbno_t)l1) >> 21);
128#endif /* DEBUG */
129#endif /* XFS_BIG_BLKNOS */
Eric Sandeenfb825572009-01-09 15:53:54 +1100130 s->br_blockcount = (xfs_filblks_t)(l1 & xfs_mask64lo(21));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 /* This is xfs_extent_state() in-line */
132 if (ext_flag) {
133 ASSERT(s->br_blockcount != 0); /* saved for DMIG */
134 st = XFS_EXT_UNWRITTEN;
135 } else
136 st = XFS_EXT_NORM;
137 s->br_state = st;
138}
139
140void
141xfs_bmbt_get_all(
Christoph Hellwiga6f64d42007-08-16 16:23:40 +1000142 xfs_bmbt_rec_host_t *r,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 xfs_bmbt_irec_t *s)
144{
145 __xfs_bmbt_get_all(r->l0, r->l1, s);
146}
147
148/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 * Extract the blockcount field from an in memory bmap extent record.
150 */
151xfs_filblks_t
152xfs_bmbt_get_blockcount(
Christoph Hellwiga6f64d42007-08-16 16:23:40 +1000153 xfs_bmbt_rec_host_t *r)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154{
Eric Sandeenfb825572009-01-09 15:53:54 +1100155 return (xfs_filblks_t)(r->l1 & xfs_mask64lo(21));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156}
157
158/*
159 * Extract the startblock field from an in memory bmap extent record.
160 */
161xfs_fsblock_t
162xfs_bmbt_get_startblock(
Christoph Hellwiga6f64d42007-08-16 16:23:40 +1000163 xfs_bmbt_rec_host_t *r)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164{
165#if XFS_BIG_BLKNOS
Eric Sandeenfb825572009-01-09 15:53:54 +1100166 return (((xfs_fsblock_t)r->l0 & xfs_mask64lo(9)) << 43) |
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 (((xfs_fsblock_t)r->l1) >> 21);
168#else
169#ifdef DEBUG
170 xfs_dfsbno_t b;
171
Eric Sandeenfb825572009-01-09 15:53:54 +1100172 b = (((xfs_dfsbno_t)r->l0 & xfs_mask64lo(9)) << 43) |
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 (((xfs_dfsbno_t)r->l1) >> 21);
Eric Sandeen9d87c312009-01-14 23:22:07 -0600174 ASSERT((b >> 32) == 0 || isnulldstartblock(b));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 return (xfs_fsblock_t)b;
176#else /* !DEBUG */
177 return (xfs_fsblock_t)(((xfs_dfsbno_t)r->l1) >> 21);
178#endif /* DEBUG */
179#endif /* XFS_BIG_BLKNOS */
180}
181
182/*
183 * Extract the startoff field from an in memory bmap extent record.
184 */
185xfs_fileoff_t
186xfs_bmbt_get_startoff(
Christoph Hellwiga6f64d42007-08-16 16:23:40 +1000187 xfs_bmbt_rec_host_t *r)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188{
189 return ((xfs_fileoff_t)r->l0 &
Eric Sandeenfb825572009-01-09 15:53:54 +1100190 xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191}
192
193xfs_exntst_t
194xfs_bmbt_get_state(
Christoph Hellwiga6f64d42007-08-16 16:23:40 +1000195 xfs_bmbt_rec_host_t *r)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196{
197 int ext_flag;
198
199 ext_flag = (int)((r->l0) >> (64 - BMBT_EXNTFLAG_BITLEN));
200 return xfs_extent_state(xfs_bmbt_get_blockcount(r),
201 ext_flag);
202}
203
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204/*
205 * Extract the blockcount field from an on disk bmap extent record.
206 */
207xfs_filblks_t
208xfs_bmbt_disk_get_blockcount(
209 xfs_bmbt_rec_t *r)
210{
Eric Sandeenfb825572009-01-09 15:53:54 +1100211 return (xfs_filblks_t)(be64_to_cpu(r->l1) & xfs_mask64lo(21));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212}
213
214/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 * Extract the startoff field from a disk format bmap extent record.
216 */
217xfs_fileoff_t
218xfs_bmbt_disk_get_startoff(
219 xfs_bmbt_rec_t *r)
220{
Christoph Hellwigcd8b0a92007-08-16 16:24:15 +1000221 return ((xfs_fileoff_t)be64_to_cpu(r->l0) &
Eric Sandeenfb825572009-01-09 15:53:54 +1100222 xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226/*
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000227 * Set all the fields in a bmap extent record from the arguments.
228 */
229void
230xfs_bmbt_set_allf(
231 xfs_bmbt_rec_host_t *r,
232 xfs_fileoff_t startoff,
233 xfs_fsblock_t startblock,
234 xfs_filblks_t blockcount,
235 xfs_exntst_t state)
236{
237 int extent_flag = (state == XFS_EXT_NORM) ? 0 : 1;
238
239 ASSERT(state == XFS_EXT_NORM || state == XFS_EXT_UNWRITTEN);
Eric Sandeenfb825572009-01-09 15:53:54 +1100240 ASSERT((startoff & xfs_mask64hi(64-BMBT_STARTOFF_BITLEN)) == 0);
241 ASSERT((blockcount & xfs_mask64hi(64-BMBT_BLOCKCOUNT_BITLEN)) == 0);
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000242
243#if XFS_BIG_BLKNOS
Eric Sandeenfb825572009-01-09 15:53:54 +1100244 ASSERT((startblock & xfs_mask64hi(64-BMBT_STARTBLOCK_BITLEN)) == 0);
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000245
246 r->l0 = ((xfs_bmbt_rec_base_t)extent_flag << 63) |
247 ((xfs_bmbt_rec_base_t)startoff << 9) |
248 ((xfs_bmbt_rec_base_t)startblock >> 43);
249 r->l1 = ((xfs_bmbt_rec_base_t)startblock << 21) |
250 ((xfs_bmbt_rec_base_t)blockcount &
Eric Sandeenfb825572009-01-09 15:53:54 +1100251 (xfs_bmbt_rec_base_t)xfs_mask64lo(21));
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000252#else /* !XFS_BIG_BLKNOS */
Eric Sandeen9d87c312009-01-14 23:22:07 -0600253 if (isnullstartblock(startblock)) {
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000254 r->l0 = ((xfs_bmbt_rec_base_t)extent_flag << 63) |
255 ((xfs_bmbt_rec_base_t)startoff << 9) |
Eric Sandeenfb825572009-01-09 15:53:54 +1100256 (xfs_bmbt_rec_base_t)xfs_mask64lo(9);
257 r->l1 = xfs_mask64hi(11) |
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000258 ((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 } else {
262 r->l0 = ((xfs_bmbt_rec_base_t)extent_flag << 63) |
263 ((xfs_bmbt_rec_base_t)startoff << 9);
264 r->l1 = ((xfs_bmbt_rec_base_t)startblock << 21) |
265 ((xfs_bmbt_rec_base_t)blockcount &
Eric Sandeenfb825572009-01-09 15:53:54 +1100266 (xfs_bmbt_rec_base_t)xfs_mask64lo(21));
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000267 }
268#endif /* XFS_BIG_BLKNOS */
269}
270
271/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 * Set all the fields in a bmap extent record from the uncompressed form.
273 */
274void
275xfs_bmbt_set_all(
Christoph Hellwiga6f64d42007-08-16 16:23:40 +1000276 xfs_bmbt_rec_host_t *r,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 xfs_bmbt_irec_t *s)
278{
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000279 xfs_bmbt_set_allf(r, s->br_startoff, s->br_startblock,
280 s->br_blockcount, s->br_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281}
282
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284/*
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000285 * Set all the fields in a disk format bmap extent record from the arguments.
286 */
287void
288xfs_bmbt_disk_set_allf(
289 xfs_bmbt_rec_t *r,
290 xfs_fileoff_t startoff,
291 xfs_fsblock_t startblock,
292 xfs_filblks_t blockcount,
293 xfs_exntst_t state)
294{
295 int extent_flag = (state == XFS_EXT_NORM) ? 0 : 1;
296
297 ASSERT(state == XFS_EXT_NORM || state == XFS_EXT_UNWRITTEN);
Eric Sandeenfb825572009-01-09 15:53:54 +1100298 ASSERT((startoff & xfs_mask64hi(64-BMBT_STARTOFF_BITLEN)) == 0);
299 ASSERT((blockcount & xfs_mask64hi(64-BMBT_BLOCKCOUNT_BITLEN)) == 0);
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000300
301#if XFS_BIG_BLKNOS
Eric Sandeenfb825572009-01-09 15:53:54 +1100302 ASSERT((startblock & xfs_mask64hi(64-BMBT_STARTBLOCK_BITLEN)) == 0);
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000303
Christoph Hellwigcd8b0a92007-08-16 16:24:15 +1000304 r->l0 = cpu_to_be64(
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000305 ((xfs_bmbt_rec_base_t)extent_flag << 63) |
306 ((xfs_bmbt_rec_base_t)startoff << 9) |
307 ((xfs_bmbt_rec_base_t)startblock >> 43));
Christoph Hellwigcd8b0a92007-08-16 16:24:15 +1000308 r->l1 = cpu_to_be64(
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000309 ((xfs_bmbt_rec_base_t)startblock << 21) |
310 ((xfs_bmbt_rec_base_t)blockcount &
Eric Sandeenfb825572009-01-09 15:53:54 +1100311 (xfs_bmbt_rec_base_t)xfs_mask64lo(21)));
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000312#else /* !XFS_BIG_BLKNOS */
Eric Sandeen9d87c312009-01-14 23:22:07 -0600313 if (isnullstartblock(startblock)) {
Christoph Hellwigcd8b0a92007-08-16 16:24:15 +1000314 r->l0 = cpu_to_be64(
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000315 ((xfs_bmbt_rec_base_t)extent_flag << 63) |
316 ((xfs_bmbt_rec_base_t)startoff << 9) |
Eric Sandeenfb825572009-01-09 15:53:54 +1100317 (xfs_bmbt_rec_base_t)xfs_mask64lo(9));
318 r->l1 = cpu_to_be64(xfs_mask64hi(11) |
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000319 ((xfs_bmbt_rec_base_t)startblock << 21) |
320 ((xfs_bmbt_rec_base_t)blockcount &
Eric Sandeenfb825572009-01-09 15:53:54 +1100321 (xfs_bmbt_rec_base_t)xfs_mask64lo(21)));
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000322 } else {
Christoph Hellwigcd8b0a92007-08-16 16:24:15 +1000323 r->l0 = cpu_to_be64(
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000324 ((xfs_bmbt_rec_base_t)extent_flag << 63) |
325 ((xfs_bmbt_rec_base_t)startoff << 9));
Christoph Hellwigcd8b0a92007-08-16 16:24:15 +1000326 r->l1 = cpu_to_be64(
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000327 ((xfs_bmbt_rec_base_t)startblock << 21) |
328 ((xfs_bmbt_rec_base_t)blockcount &
Eric Sandeenfb825572009-01-09 15:53:54 +1100329 (xfs_bmbt_rec_base_t)xfs_mask64lo(21)));
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000330 }
331#endif /* XFS_BIG_BLKNOS */
332}
333
334/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335 * Set all the fields in a bmap extent record from the uncompressed form.
336 */
337void
338xfs_bmbt_disk_set_all(
339 xfs_bmbt_rec_t *r,
340 xfs_bmbt_irec_t *s)
341{
Christoph Hellwig8cba4342007-08-16 16:23:53 +1000342 xfs_bmbt_disk_set_allf(r, s->br_startoff, s->br_startblock,
343 s->br_blockcount, s->br_state);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700344}
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345
346/*
347 * Set the blockcount field in a bmap extent record.
348 */
349void
350xfs_bmbt_set_blockcount(
Christoph Hellwiga6f64d42007-08-16 16:23:40 +1000351 xfs_bmbt_rec_host_t *r,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700352 xfs_filblks_t v)
353{
Eric Sandeenfb825572009-01-09 15:53:54 +1100354 ASSERT((v & xfs_mask64hi(43)) == 0);
355 r->l1 = (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64hi(43)) |
356 (xfs_bmbt_rec_base_t)(v & xfs_mask64lo(21));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357}
358
359/*
360 * Set the startblock field in a bmap extent record.
361 */
362void
363xfs_bmbt_set_startblock(
Christoph Hellwiga6f64d42007-08-16 16:23:40 +1000364 xfs_bmbt_rec_host_t *r,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 xfs_fsblock_t v)
366{
367#if XFS_BIG_BLKNOS
Eric Sandeenfb825572009-01-09 15:53:54 +1100368 ASSERT((v & xfs_mask64hi(12)) == 0);
369 r->l0 = (r->l0 & (xfs_bmbt_rec_base_t)xfs_mask64hi(55)) |
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 (xfs_bmbt_rec_base_t)(v >> 43);
Eric Sandeenfb825572009-01-09 15:53:54 +1100371 r->l1 = (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64lo(21)) |
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 (xfs_bmbt_rec_base_t)(v << 21);
373#else /* !XFS_BIG_BLKNOS */
Eric Sandeen9d87c312009-01-14 23:22:07 -0600374 if (isnullstartblock(v)) {
Eric Sandeenfb825572009-01-09 15:53:54 +1100375 r->l0 |= (xfs_bmbt_rec_base_t)xfs_mask64lo(9);
376 r->l1 = (xfs_bmbt_rec_base_t)xfs_mask64hi(11) |
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 ((xfs_bmbt_rec_base_t)v << 21) |
Eric Sandeenfb825572009-01-09 15:53:54 +1100378 (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64lo(21));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379 } else {
Eric Sandeenfb825572009-01-09 15:53:54 +1100380 r->l0 &= ~(xfs_bmbt_rec_base_t)xfs_mask64lo(9);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 r->l1 = ((xfs_bmbt_rec_base_t)v << 21) |
Eric Sandeenfb825572009-01-09 15:53:54 +1100382 (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64lo(21));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 }
384#endif /* XFS_BIG_BLKNOS */
385}
386
387/*
388 * Set the startoff field in a bmap extent record.
389 */
390void
391xfs_bmbt_set_startoff(
Christoph Hellwiga6f64d42007-08-16 16:23:40 +1000392 xfs_bmbt_rec_host_t *r,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 xfs_fileoff_t v)
394{
Eric Sandeenfb825572009-01-09 15:53:54 +1100395 ASSERT((v & xfs_mask64hi(9)) == 0);
396 r->l0 = (r->l0 & (xfs_bmbt_rec_base_t) xfs_mask64hi(1)) |
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 ((xfs_bmbt_rec_base_t)v << 9) |
Eric Sandeenfb825572009-01-09 15:53:54 +1100398 (r->l0 & (xfs_bmbt_rec_base_t)xfs_mask64lo(9));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700399}
400
401/*
402 * Set the extent state field in a bmap extent record.
403 */
404void
405xfs_bmbt_set_state(
Christoph Hellwiga6f64d42007-08-16 16:23:40 +1000406 xfs_bmbt_rec_host_t *r,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 xfs_exntst_t v)
408{
409 ASSERT(v == XFS_EXT_NORM || v == XFS_EXT_UNWRITTEN);
410 if (v == XFS_EXT_NORM)
Eric Sandeenfb825572009-01-09 15:53:54 +1100411 r->l0 &= xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 else
Eric Sandeenfb825572009-01-09 15:53:54 +1100413 r->l0 |= xfs_mask64hi(BMBT_EXNTFLAG_BITLEN);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414}
415
416/*
417 * Convert in-memory form of btree root to on-disk form.
418 */
419void
420xfs_bmbt_to_bmdr(
Christoph Hellwig60197e82008-10-30 17:11:19 +1100421 struct xfs_mount *mp,
Christoph Hellwig7cc95a82008-10-30 17:14:34 +1100422 struct xfs_btree_block *rblock,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 int rblocklen,
424 xfs_bmdr_block_t *dblock,
425 int dblocklen)
426{
427 int dmxr;
428 xfs_bmbt_key_t *fkp;
Christoph Hellwig576039c2006-09-28 10:58:06 +1000429 __be64 *fpp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 xfs_bmbt_key_t *tkp;
Christoph Hellwig576039c2006-09-28 10:58:06 +1000431 __be64 *tpp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432
Christoph Hellwig16259e72005-11-02 15:11:25 +1100433 ASSERT(be32_to_cpu(rblock->bb_magic) == XFS_BMAP_MAGIC);
Christoph Hellwig7cc95a82008-10-30 17:14:34 +1100434 ASSERT(be64_to_cpu(rblock->bb_u.l.bb_leftsib) == NULLDFSBNO);
435 ASSERT(be64_to_cpu(rblock->bb_u.l.bb_rightsib) == NULLDFSBNO);
Christoph Hellwig16259e72005-11-02 15:11:25 +1100436 ASSERT(be16_to_cpu(rblock->bb_level) > 0);
437 dblock->bb_level = rblock->bb_level;
438 dblock->bb_numrecs = rblock->bb_numrecs;
Christoph Hellwig60197e82008-10-30 17:11:19 +1100439 dmxr = xfs_bmdr_maxrecs(mp, dblocklen, 0);
Christoph Hellwig136341b2008-10-30 17:11:40 +1100440 fkp = XFS_BMBT_KEY_ADDR(mp, rblock, 1);
441 tkp = XFS_BMDR_KEY_ADDR(dblock, 1);
Christoph Hellwig60197e82008-10-30 17:11:19 +1100442 fpp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, rblocklen);
Christoph Hellwig136341b2008-10-30 17:11:40 +1100443 tpp = XFS_BMDR_PTR_ADDR(dblock, 1, dmxr);
Christoph Hellwig16259e72005-11-02 15:11:25 +1100444 dmxr = be16_to_cpu(dblock->bb_numrecs);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 memcpy(tkp, fkp, sizeof(*fkp) * dmxr);
Christoph Hellwig576039c2006-09-28 10:58:06 +1000446 memcpy(tpp, fpp, sizeof(*fpp) * dmxr);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447}
448
449/*
Mandy Kirkconnell4eea22f2006-03-14 13:29:52 +1100450 * Check extent records, which have just been read, for
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 * any bit in the extent flag field. ASSERT on debug
452 * kernels, as this condition should not occur.
453 * Return an error condition (1) if any flags found,
454 * otherwise return 0.
455 */
456
457int
458xfs_check_nostate_extents(
Mandy Kirkconnell4eea22f2006-03-14 13:29:52 +1100459 xfs_ifork_t *ifp,
460 xfs_extnum_t idx,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 xfs_extnum_t num)
462{
Mandy Kirkconnell4eea22f2006-03-14 13:29:52 +1100463 for (; num > 0; num--, idx++) {
Christoph Hellwiga6f64d42007-08-16 16:23:40 +1000464 xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, idx);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 if ((ep->l0 >>
466 (64 - BMBT_EXNTFLAG_BITLEN)) != 0) {
467 ASSERT(0);
468 return 1;
469 }
470 }
471 return 0;
472}
Christoph Hellwig561f7d12008-10-30 16:53:59 +1100473
474
475STATIC struct xfs_btree_cur *
476xfs_bmbt_dup_cursor(
477 struct xfs_btree_cur *cur)
478{
479 struct xfs_btree_cur *new;
480
481 new = xfs_bmbt_init_cursor(cur->bc_mp, cur->bc_tp,
482 cur->bc_private.b.ip, cur->bc_private.b.whichfork);
483
484 /*
485 * Copy the firstblock, flist, and flags values,
486 * since init cursor doesn't get them.
487 */
488 new->bc_private.b.firstblock = cur->bc_private.b.firstblock;
489 new->bc_private.b.flist = cur->bc_private.b.flist;
490 new->bc_private.b.flags = cur->bc_private.b.flags;
491
492 return new;
493}
494
Christoph Hellwig4b22a572008-10-30 16:57:40 +1100495STATIC void
496xfs_bmbt_update_cursor(
497 struct xfs_btree_cur *src,
498 struct xfs_btree_cur *dst)
499{
500 ASSERT((dst->bc_private.b.firstblock != NULLFSBLOCK) ||
501 (dst->bc_private.b.ip->i_d.di_flags & XFS_DIFLAG_REALTIME));
502 ASSERT(dst->bc_private.b.flist == src->bc_private.b.flist);
503
504 dst->bc_private.b.allocated += src->bc_private.b.allocated;
505 dst->bc_private.b.firstblock = src->bc_private.b.firstblock;
506
507 src->bc_private.b.allocated = 0;
508}
509
Christoph Hellwigce5e42d2008-10-30 16:55:23 +1100510STATIC int
Christoph Hellwigf5eb8e72008-10-30 16:57:03 +1100511xfs_bmbt_alloc_block(
512 struct xfs_btree_cur *cur,
513 union xfs_btree_ptr *start,
514 union xfs_btree_ptr *new,
515 int length,
516 int *stat)
517{
518 xfs_alloc_arg_t args; /* block allocation args */
519 int error; /* error return value */
520
521 memset(&args, 0, sizeof(args));
522 args.tp = cur->bc_tp;
523 args.mp = cur->bc_mp;
524 args.fsbno = cur->bc_private.b.firstblock;
525 args.firstblock = args.fsbno;
526
527 if (args.fsbno == NULLFSBLOCK) {
528 args.fsbno = be64_to_cpu(start->l);
529 args.type = XFS_ALLOCTYPE_START_BNO;
530 /*
531 * Make sure there is sufficient room left in the AG to
532 * complete a full tree split for an extent insert. If
533 * we are converting the middle part of an extent then
534 * we may need space for two tree splits.
535 *
536 * We are relying on the caller to make the correct block
537 * reservation for this operation to succeed. If the
538 * reservation amount is insufficient then we may fail a
539 * block allocation here and corrupt the filesystem.
540 */
541 args.minleft = xfs_trans_get_block_res(args.tp);
542 } else if (cur->bc_private.b.flist->xbf_low) {
543 args.type = XFS_ALLOCTYPE_START_BNO;
544 } else {
545 args.type = XFS_ALLOCTYPE_NEAR_BNO;
546 }
547
548 args.minlen = args.maxlen = args.prod = 1;
549 args.wasdel = cur->bc_private.b.flags & XFS_BTCUR_BPRV_WASDEL;
550 if (!args.wasdel && xfs_trans_get_block_res(args.tp) == 0) {
551 error = XFS_ERROR(ENOSPC);
552 goto error0;
553 }
554 error = xfs_alloc_vextent(&args);
555 if (error)
556 goto error0;
557
558 if (args.fsbno == NULLFSBLOCK && args.minleft) {
559 /*
560 * Could not find an AG with enough free space to satisfy
561 * a full btree split. Try again without minleft and if
562 * successful activate the lowspace algorithm.
563 */
564 args.fsbno = 0;
565 args.type = XFS_ALLOCTYPE_FIRST_AG;
566 args.minleft = 0;
567 error = xfs_alloc_vextent(&args);
568 if (error)
569 goto error0;
570 cur->bc_private.b.flist->xbf_low = 1;
571 }
572 if (args.fsbno == NULLFSBLOCK) {
573 XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
574 *stat = 0;
575 return 0;
576 }
577 ASSERT(args.len == 1);
578 cur->bc_private.b.firstblock = args.fsbno;
579 cur->bc_private.b.allocated++;
580 cur->bc_private.b.ip->i_d.di_nblocks++;
581 xfs_trans_log_inode(args.tp, cur->bc_private.b.ip, XFS_ILOG_CORE);
Christoph Hellwig7d095252009-06-08 15:33:32 +0200582 xfs_trans_mod_dquot_byino(args.tp, cur->bc_private.b.ip,
Christoph Hellwigf5eb8e72008-10-30 16:57:03 +1100583 XFS_TRANS_DQ_BCOUNT, 1L);
584
585 new->l = cpu_to_be64(args.fsbno);
586
587 XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
588 *stat = 1;
589 return 0;
590
591 error0:
592 XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
593 return error;
594}
595
596STATIC int
Christoph Hellwigd4b3a4b2008-10-30 16:57:51 +1100597xfs_bmbt_free_block(
598 struct xfs_btree_cur *cur,
599 struct xfs_buf *bp)
600{
601 struct xfs_mount *mp = cur->bc_mp;
602 struct xfs_inode *ip = cur->bc_private.b.ip;
603 struct xfs_trans *tp = cur->bc_tp;
604 xfs_fsblock_t fsbno = XFS_DADDR_TO_FSB(mp, XFS_BUF_ADDR(bp));
605
606 xfs_bmap_add_free(fsbno, 1, cur->bc_private.b.flist, mp);
607 ip->i_d.di_nblocks--;
608
609 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
Christoph Hellwig7d095252009-06-08 15:33:32 +0200610 xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
Christoph Hellwigd4b3a4b2008-10-30 16:57:51 +1100611 xfs_trans_binval(tp, bp);
612 return 0;
613}
614
615STATIC int
Christoph Hellwig91cca5df2008-10-30 16:58:01 +1100616xfs_bmbt_get_minrecs(
617 struct xfs_btree_cur *cur,
618 int level)
619{
Christoph Hellwig60197e82008-10-30 17:11:19 +1100620 if (level == cur->bc_nlevels - 1) {
621 struct xfs_ifork *ifp;
622
623 ifp = XFS_IFORK_PTR(cur->bc_private.b.ip,
624 cur->bc_private.b.whichfork);
625
626 return xfs_bmbt_maxrecs(cur->bc_mp,
627 ifp->if_broot_bytes, level == 0) / 2;
628 }
629
630 return cur->bc_mp->m_bmap_dmnr[level != 0];
Christoph Hellwig91cca5df2008-10-30 16:58:01 +1100631}
632
Christoph Hellwig60197e82008-10-30 17:11:19 +1100633int
Christoph Hellwigce5e42d2008-10-30 16:55:23 +1100634xfs_bmbt_get_maxrecs(
635 struct xfs_btree_cur *cur,
636 int level)
637{
Christoph Hellwig60197e82008-10-30 17:11:19 +1100638 if (level == cur->bc_nlevels - 1) {
639 struct xfs_ifork *ifp;
640
641 ifp = XFS_IFORK_PTR(cur->bc_private.b.ip,
642 cur->bc_private.b.whichfork);
643
644 return xfs_bmbt_maxrecs(cur->bc_mp,
645 ifp->if_broot_bytes, level == 0);
646 }
647
648 return cur->bc_mp->m_bmap_dmxr[level != 0];
649
Christoph Hellwigce5e42d2008-10-30 16:55:23 +1100650}
651
Christoph Hellwig4b22a572008-10-30 16:57:40 +1100652/*
653 * Get the maximum records we could store in the on-disk format.
654 *
655 * For non-root nodes this is equivalent to xfs_bmbt_get_maxrecs, but
656 * for the root node this checks the available space in the dinode fork
657 * so that we can resize the in-memory buffer to match it. After a
658 * resize to the maximum size this function returns the same value
659 * as xfs_bmbt_get_maxrecs for the root node, too.
660 */
661STATIC int
662xfs_bmbt_get_dmaxrecs(
663 struct xfs_btree_cur *cur,
664 int level)
665{
Christoph Hellwig60197e82008-10-30 17:11:19 +1100666 if (level != cur->bc_nlevels - 1)
667 return cur->bc_mp->m_bmap_dmxr[level != 0];
668 return xfs_bmdr_maxrecs(cur->bc_mp, cur->bc_private.b.forksize,
669 level == 0);
Christoph Hellwig4b22a572008-10-30 16:57:40 +1100670}
671
Christoph Hellwigfe033cc2008-10-30 16:56:09 +1100672STATIC void
673xfs_bmbt_init_key_from_rec(
674 union xfs_btree_key *key,
675 union xfs_btree_rec *rec)
676{
677 key->bmbt.br_startoff =
678 cpu_to_be64(xfs_bmbt_disk_get_startoff(&rec->bmbt));
679}
680
681STATIC void
Christoph Hellwig4b22a572008-10-30 16:57:40 +1100682xfs_bmbt_init_rec_from_key(
683 union xfs_btree_key *key,
684 union xfs_btree_rec *rec)
685{
686 ASSERT(key->bmbt.br_startoff != 0);
687
688 xfs_bmbt_disk_set_allf(&rec->bmbt, be64_to_cpu(key->bmbt.br_startoff),
689 0, 0, XFS_EXT_NORM);
690}
691
692STATIC void
693xfs_bmbt_init_rec_from_cur(
694 struct xfs_btree_cur *cur,
695 union xfs_btree_rec *rec)
696{
697 xfs_bmbt_disk_set_all(&rec->bmbt, &cur->bc_rec.b);
698}
699
700STATIC void
Christoph Hellwigfe033cc2008-10-30 16:56:09 +1100701xfs_bmbt_init_ptr_from_cur(
702 struct xfs_btree_cur *cur,
703 union xfs_btree_ptr *ptr)
704{
705 ptr->l = 0;
706}
707
708STATIC __int64_t
709xfs_bmbt_key_diff(
710 struct xfs_btree_cur *cur,
711 union xfs_btree_key *key)
712{
713 return (__int64_t)be64_to_cpu(key->bmbt.br_startoff) -
714 cur->bc_rec.b.br_startoff;
715}
716
Christoph Hellwig4a26e662008-10-30 16:58:32 +1100717#ifdef DEBUG
718STATIC int
719xfs_bmbt_keys_inorder(
720 struct xfs_btree_cur *cur,
721 union xfs_btree_key *k1,
722 union xfs_btree_key *k2)
723{
724 return be64_to_cpu(k1->bmbt.br_startoff) <
725 be64_to_cpu(k2->bmbt.br_startoff);
726}
727
728STATIC int
729xfs_bmbt_recs_inorder(
730 struct xfs_btree_cur *cur,
731 union xfs_btree_rec *r1,
732 union xfs_btree_rec *r2)
733{
734 return xfs_bmbt_disk_get_startoff(&r1->bmbt) +
735 xfs_bmbt_disk_get_blockcount(&r1->bmbt) <=
736 xfs_bmbt_disk_get_startoff(&r2->bmbt);
737}
738#endif /* DEBUG */
739
Christoph Hellwig8c4ed632008-10-30 16:55:13 +1100740#ifdef XFS_BTREE_TRACE
741ktrace_t *xfs_bmbt_trace_buf;
742
743STATIC void
744xfs_bmbt_trace_enter(
745 struct xfs_btree_cur *cur,
746 const char *func,
747 char *s,
748 int type,
749 int line,
750 __psunsigned_t a0,
751 __psunsigned_t a1,
752 __psunsigned_t a2,
753 __psunsigned_t a3,
754 __psunsigned_t a4,
755 __psunsigned_t a5,
756 __psunsigned_t a6,
757 __psunsigned_t a7,
758 __psunsigned_t a8,
759 __psunsigned_t a9,
760 __psunsigned_t a10)
761{
762 struct xfs_inode *ip = cur->bc_private.b.ip;
763 int whichfork = cur->bc_private.b.whichfork;
764
765 ktrace_enter(xfs_bmbt_trace_buf,
766 (void *)((__psint_t)type | (whichfork << 8) | (line << 16)),
767 (void *)func, (void *)s, (void *)ip, (void *)cur,
768 (void *)a0, (void *)a1, (void *)a2, (void *)a3,
769 (void *)a4, (void *)a5, (void *)a6, (void *)a7,
770 (void *)a8, (void *)a9, (void *)a10);
Christoph Hellwig8c4ed632008-10-30 16:55:13 +1100771}
772
773STATIC void
774xfs_bmbt_trace_cursor(
775 struct xfs_btree_cur *cur,
776 __uint32_t *s0,
777 __uint64_t *l0,
778 __uint64_t *l1)
779{
780 struct xfs_bmbt_rec_host r;
781
782 xfs_bmbt_set_all(&r, &cur->bc_rec.b);
783
784 *s0 = (cur->bc_nlevels << 24) |
785 (cur->bc_private.b.flags << 16) |
786 cur->bc_private.b.allocated;
787 *l0 = r.l0;
788 *l1 = r.l1;
789}
790
791STATIC void
792xfs_bmbt_trace_key(
793 struct xfs_btree_cur *cur,
794 union xfs_btree_key *key,
795 __uint64_t *l0,
796 __uint64_t *l1)
797{
798 *l0 = be64_to_cpu(key->bmbt.br_startoff);
799 *l1 = 0;
800}
801
Eric Sandeend96f8f82009-07-02 00:09:33 -0500802/* Endian flipping versions of the bmbt extraction functions */
803STATIC void
804xfs_bmbt_disk_get_all(
805 xfs_bmbt_rec_t *r,
806 xfs_bmbt_irec_t *s)
807{
808 __xfs_bmbt_get_all(get_unaligned_be64(&r->l0),
809 get_unaligned_be64(&r->l1), s);
810}
811
Christoph Hellwig8c4ed632008-10-30 16:55:13 +1100812STATIC void
813xfs_bmbt_trace_record(
814 struct xfs_btree_cur *cur,
815 union xfs_btree_rec *rec,
816 __uint64_t *l0,
817 __uint64_t *l1,
818 __uint64_t *l2)
819{
820 struct xfs_bmbt_irec irec;
821
822 xfs_bmbt_disk_get_all(&rec->bmbt, &irec);
823 *l0 = irec.br_startoff;
824 *l1 = irec.br_startblock;
825 *l2 = irec.br_blockcount;
826}
827#endif /* XFS_BTREE_TRACE */
828
Christoph Hellwig561f7d12008-10-30 16:53:59 +1100829static const struct xfs_btree_ops xfs_bmbt_ops = {
Christoph Hellwig65f1eae2008-10-30 16:55:34 +1100830 .rec_len = sizeof(xfs_bmbt_rec_t),
831 .key_len = sizeof(xfs_bmbt_key_t),
832
Christoph Hellwig561f7d12008-10-30 16:53:59 +1100833 .dup_cursor = xfs_bmbt_dup_cursor,
Christoph Hellwig4b22a572008-10-30 16:57:40 +1100834 .update_cursor = xfs_bmbt_update_cursor,
Christoph Hellwigf5eb8e72008-10-30 16:57:03 +1100835 .alloc_block = xfs_bmbt_alloc_block,
Christoph Hellwigd4b3a4b2008-10-30 16:57:51 +1100836 .free_block = xfs_bmbt_free_block,
Christoph Hellwigce5e42d2008-10-30 16:55:23 +1100837 .get_maxrecs = xfs_bmbt_get_maxrecs,
Christoph Hellwig91cca5df2008-10-30 16:58:01 +1100838 .get_minrecs = xfs_bmbt_get_minrecs,
Christoph Hellwig4b22a572008-10-30 16:57:40 +1100839 .get_dmaxrecs = xfs_bmbt_get_dmaxrecs,
Christoph Hellwigfe033cc2008-10-30 16:56:09 +1100840 .init_key_from_rec = xfs_bmbt_init_key_from_rec,
Christoph Hellwig4b22a572008-10-30 16:57:40 +1100841 .init_rec_from_key = xfs_bmbt_init_rec_from_key,
842 .init_rec_from_cur = xfs_bmbt_init_rec_from_cur,
Christoph Hellwigfe033cc2008-10-30 16:56:09 +1100843 .init_ptr_from_cur = xfs_bmbt_init_ptr_from_cur,
844 .key_diff = xfs_bmbt_key_diff,
Christoph Hellwig8c4ed632008-10-30 16:55:13 +1100845
Christoph Hellwig4a26e662008-10-30 16:58:32 +1100846#ifdef DEBUG
847 .keys_inorder = xfs_bmbt_keys_inorder,
848 .recs_inorder = xfs_bmbt_recs_inorder,
849#endif
850
Christoph Hellwig8c4ed632008-10-30 16:55:13 +1100851#ifdef XFS_BTREE_TRACE
852 .trace_enter = xfs_bmbt_trace_enter,
853 .trace_cursor = xfs_bmbt_trace_cursor,
854 .trace_key = xfs_bmbt_trace_key,
855 .trace_record = xfs_bmbt_trace_record,
856#endif
Christoph Hellwig561f7d12008-10-30 16:53:59 +1100857};
858
859/*
860 * Allocate a new bmap btree cursor.
861 */
862struct xfs_btree_cur * /* new bmap btree cursor */
863xfs_bmbt_init_cursor(
864 struct xfs_mount *mp, /* file system mount point */
865 struct xfs_trans *tp, /* transaction pointer */
866 struct xfs_inode *ip, /* inode owning the btree */
867 int whichfork) /* data or attr fork */
868{
869 struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
870 struct xfs_btree_cur *cur;
871
872 cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_SLEEP);
873
874 cur->bc_tp = tp;
875 cur->bc_mp = mp;
876 cur->bc_nlevels = be16_to_cpu(ifp->if_broot->bb_level) + 1;
877 cur->bc_btnum = XFS_BTNUM_BMAP;
878 cur->bc_blocklog = mp->m_sb.sb_blocklog;
879
880 cur->bc_ops = &xfs_bmbt_ops;
Christoph Hellwige99ab902008-10-30 16:54:33 +1100881 cur->bc_flags = XFS_BTREE_LONG_PTRS | XFS_BTREE_ROOT_IN_INODE;
Christoph Hellwig561f7d12008-10-30 16:53:59 +1100882
883 cur->bc_private.b.forksize = XFS_IFORK_SIZE(ip, whichfork);
884 cur->bc_private.b.ip = ip;
885 cur->bc_private.b.firstblock = NULLFSBLOCK;
886 cur->bc_private.b.flist = NULL;
887 cur->bc_private.b.allocated = 0;
888 cur->bc_private.b.flags = 0;
889 cur->bc_private.b.whichfork = whichfork;
890
891 return cur;
892}
Christoph Hellwig60197e82008-10-30 17:11:19 +1100893
894/*
895 * Calculate number of records in a bmap btree block.
896 */
897int
898xfs_bmbt_maxrecs(
899 struct xfs_mount *mp,
900 int blocklen,
901 int leaf)
902{
Christoph Hellwig7cc95a82008-10-30 17:14:34 +1100903 blocklen -= XFS_BMBT_BLOCK_LEN(mp);
Christoph Hellwig60197e82008-10-30 17:11:19 +1100904
905 if (leaf)
906 return blocklen / sizeof(xfs_bmbt_rec_t);
907 return blocklen / (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t));
908}
909
910/*
911 * Calculate number of records in a bmap btree inode root.
912 */
913int
914xfs_bmdr_maxrecs(
915 struct xfs_mount *mp,
916 int blocklen,
917 int leaf)
918{
919 blocklen -= sizeof(xfs_bmdr_block_t);
920
921 if (leaf)
922 return blocklen / sizeof(xfs_bmdr_rec_t);
923 return blocklen / (sizeof(xfs_bmdr_key_t) + sizeof(xfs_bmdr_ptr_t));
924}