Commit | Line | Data |
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1da177e4 | 1 | /* |
7b718769 NS |
2 | * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc. |
3 | * All Rights Reserved. | |
1da177e4 | 4 | * |
7b718769 NS |
5 | * This program is free software; you can redistribute it and/or |
6 | * modify it under the terms of the GNU General Public License as | |
1da177e4 LT |
7 | * published by the Free Software Foundation. |
8 | * | |
7b718769 NS |
9 | * This program is distributed in the hope that it would be useful, |
10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
12 | * GNU General Public License for more details. | |
1da177e4 | 13 | * |
7b718769 NS |
14 | * You should have received a copy of the GNU General Public License |
15 | * along with this program; if not, write the Free Software Foundation, | |
16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
1da177e4 | 17 | */ |
1da177e4 | 18 | #include "xfs.h" |
a844f451 | 19 | #include "xfs_fs.h" |
1da177e4 | 20 | #include "xfs_types.h" |
a844f451 | 21 | #include "xfs_bit.h" |
1da177e4 | 22 | #include "xfs_log.h" |
a844f451 | 23 | #include "xfs_inum.h" |
1da177e4 LT |
24 | #include "xfs_trans.h" |
25 | #include "xfs_sb.h" | |
26 | #include "xfs_ag.h" | |
1da177e4 LT |
27 | #include "xfs_dir2.h" |
28 | #include "xfs_dmapi.h" | |
29 | #include "xfs_mount.h" | |
1da177e4 | 30 | #include "xfs_bmap_btree.h" |
a844f451 | 31 | #include "xfs_alloc_btree.h" |
1da177e4 | 32 | #include "xfs_ialloc_btree.h" |
1da177e4 | 33 | #include "xfs_dir2_sf.h" |
a844f451 | 34 | #include "xfs_attr_sf.h" |
1da177e4 | 35 | #include "xfs_dinode.h" |
1da177e4 | 36 | #include "xfs_inode.h" |
a844f451 | 37 | #include "xfs_inode_item.h" |
1da177e4 | 38 | #include "xfs_alloc.h" |
a844f451 | 39 | #include "xfs_btree.h" |
8c4ed633 | 40 | #include "xfs_btree_trace.h" |
a844f451 NS |
41 | #include "xfs_ialloc.h" |
42 | #include "xfs_itable.h" | |
1da177e4 LT |
43 | #include "xfs_bmap.h" |
44 | #include "xfs_error.h" | |
45 | #include "xfs_quota.h" | |
46 | ||
1da177e4 LT |
47 | /* |
48 | * Determine the extent state. | |
49 | */ | |
50 | /* ARGSUSED */ | |
51 | STATIC xfs_exntst_t | |
52 | xfs_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 | ||
1da177e4 LT |
63 | /* |
64 | * Convert on-disk form of btree root to in-memory form. | |
65 | */ | |
66 | void | |
67 | xfs_bmdr_to_bmbt( | |
60197e8d | 68 | struct xfs_mount *mp, |
1da177e4 LT |
69 | xfs_bmdr_block_t *dblock, |
70 | int dblocklen, | |
7cc95a82 | 71 | struct xfs_btree_block *rblock, |
1da177e4 LT |
72 | int rblocklen) |
73 | { | |
74 | int dmxr; | |
75 | xfs_bmbt_key_t *fkp; | |
576039cf | 76 | __be64 *fpp; |
1da177e4 | 77 | xfs_bmbt_key_t *tkp; |
576039cf | 78 | __be64 *tpp; |
1da177e4 | 79 | |
16259e7d CH |
80 | 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; | |
7cc95a82 CH |
84 | rblock->bb_u.l.bb_leftsib = cpu_to_be64(NULLDFSBNO); |
85 | rblock->bb_u.l.bb_rightsib = cpu_to_be64(NULLDFSBNO); | |
60197e8d | 86 | dmxr = xfs_bmdr_maxrecs(mp, dblocklen, 0); |
136341b4 CH |
87 | 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); | |
60197e8d | 90 | tpp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, rblocklen); |
16259e7d | 91 | dmxr = be16_to_cpu(dblock->bb_numrecs); |
1da177e4 | 92 | memcpy(tkp, fkp, sizeof(*fkp) * dmxr); |
576039cf | 93 | memcpy(tpp, fpp, sizeof(*fpp) * dmxr); |
1da177e4 LT |
94 | } |
95 | ||
1da177e4 LT |
96 | /* |
97 | * 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 | ||
7989cb8e | 102 | STATIC_INLINE void |
1da177e4 LT |
103 | __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 & | |
fb82557f | 113 | xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9; |
1da177e4 | 114 | #if XFS_BIG_BLKNOS |
fb82557f | 115 | s->br_startblock = (((xfs_fsblock_t)l0 & xfs_mask64lo(9)) << 43) | |
1da177e4 LT |
116 | (((xfs_fsblock_t)l1) >> 21); |
117 | #else | |
118 | #ifdef DEBUG | |
119 | { | |
120 | xfs_dfsbno_t b; | |
121 | ||
fb82557f | 122 | b = (((xfs_dfsbno_t)l0 & xfs_mask64lo(9)) << 43) | |
1da177e4 | 123 | (((xfs_dfsbno_t)l1) >> 21); |
9d87c319 | 124 | ASSERT((b >> 32) == 0 || isnulldstartblock(b)); |
1da177e4 LT |
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 */ | |
fb82557f | 131 | s->br_blockcount = (xfs_filblks_t)(l1 & xfs_mask64lo(21)); |
1da177e4 LT |
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 | ||
141 | void | |
142 | xfs_bmbt_get_all( | |
a6f64d4a | 143 | xfs_bmbt_rec_host_t *r, |
1da177e4 LT |
144 | xfs_bmbt_irec_t *s) |
145 | { | |
146 | __xfs_bmbt_get_all(r->l0, r->l1, s); | |
147 | } | |
148 | ||
1da177e4 LT |
149 | /* |
150 | * Extract the blockcount field from an in memory bmap extent record. | |
151 | */ | |
152 | xfs_filblks_t | |
153 | xfs_bmbt_get_blockcount( | |
a6f64d4a | 154 | xfs_bmbt_rec_host_t *r) |
1da177e4 | 155 | { |
fb82557f | 156 | return (xfs_filblks_t)(r->l1 & xfs_mask64lo(21)); |
1da177e4 LT |
157 | } |
158 | ||
159 | /* | |
160 | * Extract the startblock field from an in memory bmap extent record. | |
161 | */ | |
162 | xfs_fsblock_t | |
163 | xfs_bmbt_get_startblock( | |
a6f64d4a | 164 | xfs_bmbt_rec_host_t *r) |
1da177e4 LT |
165 | { |
166 | #if XFS_BIG_BLKNOS | |
fb82557f | 167 | return (((xfs_fsblock_t)r->l0 & xfs_mask64lo(9)) << 43) | |
1da177e4 LT |
168 | (((xfs_fsblock_t)r->l1) >> 21); |
169 | #else | |
170 | #ifdef DEBUG | |
171 | xfs_dfsbno_t b; | |
172 | ||
fb82557f | 173 | b = (((xfs_dfsbno_t)r->l0 & xfs_mask64lo(9)) << 43) | |
1da177e4 | 174 | (((xfs_dfsbno_t)r->l1) >> 21); |
9d87c319 | 175 | ASSERT((b >> 32) == 0 || isnulldstartblock(b)); |
1da177e4 LT |
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 | */ | |
186 | xfs_fileoff_t | |
187 | xfs_bmbt_get_startoff( | |
a6f64d4a | 188 | xfs_bmbt_rec_host_t *r) |
1da177e4 LT |
189 | { |
190 | return ((xfs_fileoff_t)r->l0 & | |
fb82557f | 191 | xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9; |
1da177e4 LT |
192 | } |
193 | ||
194 | xfs_exntst_t | |
195 | xfs_bmbt_get_state( | |
a6f64d4a | 196 | xfs_bmbt_rec_host_t *r) |
1da177e4 LT |
197 | { |
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 | ||
1da177e4 LT |
205 | /* |
206 | * Extract the blockcount field from an on disk bmap extent record. | |
207 | */ | |
208 | xfs_filblks_t | |
209 | xfs_bmbt_disk_get_blockcount( | |
210 | xfs_bmbt_rec_t *r) | |
211 | { | |
fb82557f | 212 | return (xfs_filblks_t)(be64_to_cpu(r->l1) & xfs_mask64lo(21)); |
1da177e4 LT |
213 | } |
214 | ||
1da177e4 LT |
215 | /* |
216 | * Extract the startoff field from a disk format bmap extent record. | |
217 | */ | |
218 | xfs_fileoff_t | |
219 | xfs_bmbt_disk_get_startoff( | |
220 | xfs_bmbt_rec_t *r) | |
221 | { | |
cd8b0a97 | 222 | return ((xfs_fileoff_t)be64_to_cpu(r->l0) & |
fb82557f | 223 | xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9; |
1da177e4 | 224 | } |
1da177e4 | 225 | |
1da177e4 | 226 | |
1da177e4 LT |
227 | /* |
228 | * Set all the fields in a bmap extent record from the arguments. | |
229 | */ | |
230 | void | |
231 | xfs_bmbt_set_allf( | |
8cba4344 CH |
232 | xfs_bmbt_rec_host_t *r, |
233 | xfs_fileoff_t startoff, | |
234 | xfs_fsblock_t startblock, | |
235 | xfs_filblks_t blockcount, | |
236 | xfs_exntst_t state) | |
1da177e4 | 237 | { |
8cba4344 CH |
238 | int extent_flag = (state == XFS_EXT_NORM) ? 0 : 1; |
239 | ||
240 | ASSERT(state == XFS_EXT_NORM || state == XFS_EXT_UNWRITTEN); | |
fb82557f ES |
241 | ASSERT((startoff & xfs_mask64hi(64-BMBT_STARTOFF_BITLEN)) == 0); |
242 | ASSERT((blockcount & xfs_mask64hi(64-BMBT_BLOCKCOUNT_BITLEN)) == 0); | |
1da177e4 | 243 | |
1da177e4 | 244 | #if XFS_BIG_BLKNOS |
fb82557f | 245 | ASSERT((startblock & xfs_mask64hi(64-BMBT_STARTBLOCK_BITLEN)) == 0); |
8cba4344 | 246 | |
1da177e4 | 247 | r->l0 = ((xfs_bmbt_rec_base_t)extent_flag << 63) | |
8cba4344 CH |
248 | ((xfs_bmbt_rec_base_t)startoff << 9) | |
249 | ((xfs_bmbt_rec_base_t)startblock >> 43); | |
250 | r->l1 = ((xfs_bmbt_rec_base_t)startblock << 21) | | |
251 | ((xfs_bmbt_rec_base_t)blockcount & | |
fb82557f | 252 | (xfs_bmbt_rec_base_t)xfs_mask64lo(21)); |
1da177e4 | 253 | #else /* !XFS_BIG_BLKNOS */ |
9d87c319 | 254 | if (isnullstartblock(startblock)) { |
1da177e4 | 255 | r->l0 = ((xfs_bmbt_rec_base_t)extent_flag << 63) | |
8cba4344 | 256 | ((xfs_bmbt_rec_base_t)startoff << 9) | |
fb82557f ES |
257 | (xfs_bmbt_rec_base_t)xfs_mask64lo(9); |
258 | r->l1 = xfs_mask64hi(11) | | |
8cba4344 CH |
259 | ((xfs_bmbt_rec_base_t)startblock << 21) | |
260 | ((xfs_bmbt_rec_base_t)blockcount & | |
fb82557f | 261 | (xfs_bmbt_rec_base_t)xfs_mask64lo(21)); |
1da177e4 LT |
262 | } else { |
263 | r->l0 = ((xfs_bmbt_rec_base_t)extent_flag << 63) | | |
8cba4344 CH |
264 | ((xfs_bmbt_rec_base_t)startoff << 9); |
265 | r->l1 = ((xfs_bmbt_rec_base_t)startblock << 21) | | |
266 | ((xfs_bmbt_rec_base_t)blockcount & | |
fb82557f | 267 | (xfs_bmbt_rec_base_t)xfs_mask64lo(21)); |
1da177e4 LT |
268 | } |
269 | #endif /* XFS_BIG_BLKNOS */ | |
270 | } | |
271 | ||
1da177e4 LT |
272 | /* |
273 | * Set all the fields in a bmap extent record from the uncompressed form. | |
274 | */ | |
275 | void | |
8cba4344 CH |
276 | xfs_bmbt_set_all( |
277 | xfs_bmbt_rec_host_t *r, | |
278 | xfs_bmbt_irec_t *s) | |
1da177e4 | 279 | { |
8cba4344 CH |
280 | xfs_bmbt_set_allf(r, s->br_startoff, s->br_startblock, |
281 | s->br_blockcount, s->br_state); | |
1da177e4 LT |
282 | } |
283 | ||
8cba4344 | 284 | |
1da177e4 LT |
285 | /* |
286 | * Set all the fields in a disk format bmap extent record from the arguments. | |
287 | */ | |
288 | void | |
289 | xfs_bmbt_disk_set_allf( | |
8cba4344 CH |
290 | xfs_bmbt_rec_t *r, |
291 | xfs_fileoff_t startoff, | |
292 | xfs_fsblock_t startblock, | |
293 | xfs_filblks_t blockcount, | |
294 | xfs_exntst_t state) | |
1da177e4 | 295 | { |
8cba4344 CH |
296 | int extent_flag = (state == XFS_EXT_NORM) ? 0 : 1; |
297 | ||
298 | ASSERT(state == XFS_EXT_NORM || state == XFS_EXT_UNWRITTEN); | |
fb82557f ES |
299 | ASSERT((startoff & xfs_mask64hi(64-BMBT_STARTOFF_BITLEN)) == 0); |
300 | ASSERT((blockcount & xfs_mask64hi(64-BMBT_BLOCKCOUNT_BITLEN)) == 0); | |
1da177e4 | 301 | |
1da177e4 | 302 | #if XFS_BIG_BLKNOS |
fb82557f | 303 | ASSERT((startblock & xfs_mask64hi(64-BMBT_STARTBLOCK_BITLEN)) == 0); |
8cba4344 | 304 | |
cd8b0a97 | 305 | r->l0 = cpu_to_be64( |
8cba4344 CH |
306 | ((xfs_bmbt_rec_base_t)extent_flag << 63) | |
307 | ((xfs_bmbt_rec_base_t)startoff << 9) | | |
308 | ((xfs_bmbt_rec_base_t)startblock >> 43)); | |
cd8b0a97 | 309 | r->l1 = cpu_to_be64( |
8cba4344 CH |
310 | ((xfs_bmbt_rec_base_t)startblock << 21) | |
311 | ((xfs_bmbt_rec_base_t)blockcount & | |
fb82557f | 312 | (xfs_bmbt_rec_base_t)xfs_mask64lo(21))); |
1da177e4 | 313 | #else /* !XFS_BIG_BLKNOS */ |
9d87c319 | 314 | if (isnullstartblock(startblock)) { |
cd8b0a97 | 315 | r->l0 = cpu_to_be64( |
8cba4344 CH |
316 | ((xfs_bmbt_rec_base_t)extent_flag << 63) | |
317 | ((xfs_bmbt_rec_base_t)startoff << 9) | | |
fb82557f ES |
318 | (xfs_bmbt_rec_base_t)xfs_mask64lo(9)); |
319 | r->l1 = cpu_to_be64(xfs_mask64hi(11) | | |
8cba4344 CH |
320 | ((xfs_bmbt_rec_base_t)startblock << 21) | |
321 | ((xfs_bmbt_rec_base_t)blockcount & | |
fb82557f | 322 | (xfs_bmbt_rec_base_t)xfs_mask64lo(21))); |
1da177e4 | 323 | } else { |
cd8b0a97 | 324 | r->l0 = cpu_to_be64( |
8cba4344 CH |
325 | ((xfs_bmbt_rec_base_t)extent_flag << 63) | |
326 | ((xfs_bmbt_rec_base_t)startoff << 9)); | |
cd8b0a97 | 327 | r->l1 = cpu_to_be64( |
8cba4344 CH |
328 | ((xfs_bmbt_rec_base_t)startblock << 21) | |
329 | ((xfs_bmbt_rec_base_t)blockcount & | |
fb82557f | 330 | (xfs_bmbt_rec_base_t)xfs_mask64lo(21))); |
1da177e4 LT |
331 | } |
332 | #endif /* XFS_BIG_BLKNOS */ | |
333 | } | |
8cba4344 CH |
334 | |
335 | /* | |
336 | * Set all the fields in a bmap extent record from the uncompressed form. | |
337 | */ | |
338 | void | |
339 | xfs_bmbt_disk_set_all( | |
340 | xfs_bmbt_rec_t *r, | |
341 | xfs_bmbt_irec_t *s) | |
342 | { | |
343 | xfs_bmbt_disk_set_allf(r, s->br_startoff, s->br_startblock, | |
344 | s->br_blockcount, s->br_state); | |
345 | } | |
1da177e4 LT |
346 | |
347 | /* | |
348 | * Set the blockcount field in a bmap extent record. | |
349 | */ | |
350 | void | |
351 | xfs_bmbt_set_blockcount( | |
a6f64d4a | 352 | xfs_bmbt_rec_host_t *r, |
1da177e4 LT |
353 | xfs_filblks_t v) |
354 | { | |
fb82557f ES |
355 | ASSERT((v & xfs_mask64hi(43)) == 0); |
356 | r->l1 = (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64hi(43)) | | |
357 | (xfs_bmbt_rec_base_t)(v & xfs_mask64lo(21)); | |
1da177e4 LT |
358 | } |
359 | ||
360 | /* | |
361 | * Set the startblock field in a bmap extent record. | |
362 | */ | |
363 | void | |
364 | xfs_bmbt_set_startblock( | |
a6f64d4a | 365 | xfs_bmbt_rec_host_t *r, |
1da177e4 LT |
366 | xfs_fsblock_t v) |
367 | { | |
368 | #if XFS_BIG_BLKNOS | |
fb82557f ES |
369 | ASSERT((v & xfs_mask64hi(12)) == 0); |
370 | r->l0 = (r->l0 & (xfs_bmbt_rec_base_t)xfs_mask64hi(55)) | | |
1da177e4 | 371 | (xfs_bmbt_rec_base_t)(v >> 43); |
fb82557f | 372 | r->l1 = (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64lo(21)) | |
1da177e4 LT |
373 | (xfs_bmbt_rec_base_t)(v << 21); |
374 | #else /* !XFS_BIG_BLKNOS */ | |
9d87c319 | 375 | if (isnullstartblock(v)) { |
fb82557f ES |
376 | r->l0 |= (xfs_bmbt_rec_base_t)xfs_mask64lo(9); |
377 | r->l1 = (xfs_bmbt_rec_base_t)xfs_mask64hi(11) | | |
1da177e4 | 378 | ((xfs_bmbt_rec_base_t)v << 21) | |
fb82557f | 379 | (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64lo(21)); |
1da177e4 | 380 | } else { |
fb82557f | 381 | r->l0 &= ~(xfs_bmbt_rec_base_t)xfs_mask64lo(9); |
1da177e4 | 382 | r->l1 = ((xfs_bmbt_rec_base_t)v << 21) | |
fb82557f | 383 | (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64lo(21)); |
1da177e4 LT |
384 | } |
385 | #endif /* XFS_BIG_BLKNOS */ | |
386 | } | |
387 | ||
388 | /* | |
389 | * Set the startoff field in a bmap extent record. | |
390 | */ | |
391 | void | |
392 | xfs_bmbt_set_startoff( | |
a6f64d4a | 393 | xfs_bmbt_rec_host_t *r, |
1da177e4 LT |
394 | xfs_fileoff_t v) |
395 | { | |
fb82557f ES |
396 | ASSERT((v & xfs_mask64hi(9)) == 0); |
397 | r->l0 = (r->l0 & (xfs_bmbt_rec_base_t) xfs_mask64hi(1)) | | |
1da177e4 | 398 | ((xfs_bmbt_rec_base_t)v << 9) | |
fb82557f | 399 | (r->l0 & (xfs_bmbt_rec_base_t)xfs_mask64lo(9)); |
1da177e4 LT |
400 | } |
401 | ||
402 | /* | |
403 | * Set the extent state field in a bmap extent record. | |
404 | */ | |
405 | void | |
406 | xfs_bmbt_set_state( | |
a6f64d4a | 407 | xfs_bmbt_rec_host_t *r, |
1da177e4 LT |
408 | xfs_exntst_t v) |
409 | { | |
410 | ASSERT(v == XFS_EXT_NORM || v == XFS_EXT_UNWRITTEN); | |
411 | if (v == XFS_EXT_NORM) | |
fb82557f | 412 | r->l0 &= xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN); |
1da177e4 | 413 | else |
fb82557f | 414 | r->l0 |= xfs_mask64hi(BMBT_EXNTFLAG_BITLEN); |
1da177e4 LT |
415 | } |
416 | ||
417 | /* | |
418 | * Convert in-memory form of btree root to on-disk form. | |
419 | */ | |
420 | void | |
421 | xfs_bmbt_to_bmdr( | |
60197e8d | 422 | struct xfs_mount *mp, |
7cc95a82 | 423 | struct xfs_btree_block *rblock, |
1da177e4 LT |
424 | int rblocklen, |
425 | xfs_bmdr_block_t *dblock, | |
426 | int dblocklen) | |
427 | { | |
428 | int dmxr; | |
429 | xfs_bmbt_key_t *fkp; | |
576039cf | 430 | __be64 *fpp; |
1da177e4 | 431 | xfs_bmbt_key_t *tkp; |
576039cf | 432 | __be64 *tpp; |
1da177e4 | 433 | |
16259e7d | 434 | ASSERT(be32_to_cpu(rblock->bb_magic) == XFS_BMAP_MAGIC); |
7cc95a82 CH |
435 | ASSERT(be64_to_cpu(rblock->bb_u.l.bb_leftsib) == NULLDFSBNO); |
436 | ASSERT(be64_to_cpu(rblock->bb_u.l.bb_rightsib) == NULLDFSBNO); | |
16259e7d CH |
437 | ASSERT(be16_to_cpu(rblock->bb_level) > 0); |
438 | dblock->bb_level = rblock->bb_level; | |
439 | dblock->bb_numrecs = rblock->bb_numrecs; | |
60197e8d | 440 | dmxr = xfs_bmdr_maxrecs(mp, dblocklen, 0); |
136341b4 CH |
441 | fkp = XFS_BMBT_KEY_ADDR(mp, rblock, 1); |
442 | tkp = XFS_BMDR_KEY_ADDR(dblock, 1); | |
60197e8d | 443 | fpp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, rblocklen); |
136341b4 | 444 | tpp = XFS_BMDR_PTR_ADDR(dblock, 1, dmxr); |
16259e7d | 445 | dmxr = be16_to_cpu(dblock->bb_numrecs); |
1da177e4 | 446 | memcpy(tkp, fkp, sizeof(*fkp) * dmxr); |
576039cf | 447 | memcpy(tpp, fpp, sizeof(*fpp) * dmxr); |
1da177e4 LT |
448 | } |
449 | ||
1da177e4 | 450 | /* |
4eea22f0 | 451 | * Check extent records, which have just been read, for |
1da177e4 LT |
452 | * any bit in the extent flag field. ASSERT on debug |
453 | * kernels, as this condition should not occur. | |
454 | * Return an error condition (1) if any flags found, | |
455 | * otherwise return 0. | |
456 | */ | |
457 | ||
458 | int | |
459 | xfs_check_nostate_extents( | |
4eea22f0 MK |
460 | xfs_ifork_t *ifp, |
461 | xfs_extnum_t idx, | |
1da177e4 LT |
462 | xfs_extnum_t num) |
463 | { | |
4eea22f0 | 464 | for (; num > 0; num--, idx++) { |
a6f64d4a | 465 | xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, idx); |
1da177e4 LT |
466 | if ((ep->l0 >> |
467 | (64 - BMBT_EXNTFLAG_BITLEN)) != 0) { | |
468 | ASSERT(0); | |
469 | return 1; | |
470 | } | |
471 | } | |
472 | return 0; | |
473 | } | |
561f7d17 CH |
474 | |
475 | ||
476 | STATIC struct xfs_btree_cur * | |
477 | xfs_bmbt_dup_cursor( | |
478 | struct xfs_btree_cur *cur) | |
479 | { | |
480 | struct xfs_btree_cur *new; | |
481 | ||
482 | new = xfs_bmbt_init_cursor(cur->bc_mp, cur->bc_tp, | |
483 | cur->bc_private.b.ip, cur->bc_private.b.whichfork); | |
484 | ||
485 | /* | |
486 | * Copy the firstblock, flist, and flags values, | |
487 | * since init cursor doesn't get them. | |
488 | */ | |
489 | new->bc_private.b.firstblock = cur->bc_private.b.firstblock; | |
490 | new->bc_private.b.flist = cur->bc_private.b.flist; | |
491 | new->bc_private.b.flags = cur->bc_private.b.flags; | |
492 | ||
493 | return new; | |
494 | } | |
495 | ||
4b22a571 CH |
496 | STATIC void |
497 | xfs_bmbt_update_cursor( | |
498 | struct xfs_btree_cur *src, | |
499 | struct xfs_btree_cur *dst) | |
500 | { | |
501 | ASSERT((dst->bc_private.b.firstblock != NULLFSBLOCK) || | |
502 | (dst->bc_private.b.ip->i_d.di_flags & XFS_DIFLAG_REALTIME)); | |
503 | ASSERT(dst->bc_private.b.flist == src->bc_private.b.flist); | |
504 | ||
505 | dst->bc_private.b.allocated += src->bc_private.b.allocated; | |
506 | dst->bc_private.b.firstblock = src->bc_private.b.firstblock; | |
507 | ||
508 | src->bc_private.b.allocated = 0; | |
509 | } | |
510 | ||
f5eb8e7c CH |
511 | STATIC int |
512 | xfs_bmbt_alloc_block( | |
513 | struct xfs_btree_cur *cur, | |
514 | union xfs_btree_ptr *start, | |
515 | union xfs_btree_ptr *new, | |
516 | int length, | |
517 | int *stat) | |
518 | { | |
519 | xfs_alloc_arg_t args; /* block allocation args */ | |
520 | int error; /* error return value */ | |
521 | ||
522 | memset(&args, 0, sizeof(args)); | |
523 | args.tp = cur->bc_tp; | |
524 | args.mp = cur->bc_mp; | |
525 | args.fsbno = cur->bc_private.b.firstblock; | |
526 | args.firstblock = args.fsbno; | |
527 | ||
528 | if (args.fsbno == NULLFSBLOCK) { | |
529 | args.fsbno = be64_to_cpu(start->l); | |
530 | args.type = XFS_ALLOCTYPE_START_BNO; | |
531 | /* | |
532 | * Make sure there is sufficient room left in the AG to | |
533 | * complete a full tree split for an extent insert. If | |
534 | * we are converting the middle part of an extent then | |
535 | * we may need space for two tree splits. | |
536 | * | |
537 | * We are relying on the caller to make the correct block | |
538 | * reservation for this operation to succeed. If the | |
539 | * reservation amount is insufficient then we may fail a | |
540 | * block allocation here and corrupt the filesystem. | |
541 | */ | |
542 | args.minleft = xfs_trans_get_block_res(args.tp); | |
543 | } else if (cur->bc_private.b.flist->xbf_low) { | |
544 | args.type = XFS_ALLOCTYPE_START_BNO; | |
545 | } else { | |
546 | args.type = XFS_ALLOCTYPE_NEAR_BNO; | |
547 | } | |
548 | ||
549 | args.minlen = args.maxlen = args.prod = 1; | |
550 | args.wasdel = cur->bc_private.b.flags & XFS_BTCUR_BPRV_WASDEL; | |
551 | if (!args.wasdel && xfs_trans_get_block_res(args.tp) == 0) { | |
552 | error = XFS_ERROR(ENOSPC); | |
553 | goto error0; | |
554 | } | |
555 | error = xfs_alloc_vextent(&args); | |
556 | if (error) | |
557 | goto error0; | |
558 | ||
559 | if (args.fsbno == NULLFSBLOCK && args.minleft) { | |
560 | /* | |
561 | * Could not find an AG with enough free space to satisfy | |
562 | * a full btree split. Try again without minleft and if | |
563 | * successful activate the lowspace algorithm. | |
564 | */ | |
565 | args.fsbno = 0; | |
566 | args.type = XFS_ALLOCTYPE_FIRST_AG; | |
567 | args.minleft = 0; | |
568 | error = xfs_alloc_vextent(&args); | |
569 | if (error) | |
570 | goto error0; | |
571 | cur->bc_private.b.flist->xbf_low = 1; | |
572 | } | |
573 | if (args.fsbno == NULLFSBLOCK) { | |
574 | XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT); | |
575 | *stat = 0; | |
576 | return 0; | |
577 | } | |
578 | ASSERT(args.len == 1); | |
579 | cur->bc_private.b.firstblock = args.fsbno; | |
580 | cur->bc_private.b.allocated++; | |
581 | cur->bc_private.b.ip->i_d.di_nblocks++; | |
582 | xfs_trans_log_inode(args.tp, cur->bc_private.b.ip, XFS_ILOG_CORE); | |
7d095257 | 583 | xfs_trans_mod_dquot_byino(args.tp, cur->bc_private.b.ip, |
f5eb8e7c CH |
584 | XFS_TRANS_DQ_BCOUNT, 1L); |
585 | ||
586 | new->l = cpu_to_be64(args.fsbno); | |
587 | ||
588 | XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT); | |
589 | *stat = 1; | |
590 | return 0; | |
591 | ||
592 | error0: | |
593 | XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR); | |
594 | return error; | |
595 | } | |
596 | ||
d4b3a4b7 CH |
597 | STATIC int |
598 | xfs_bmbt_free_block( | |
599 | struct xfs_btree_cur *cur, | |
600 | struct xfs_buf *bp) | |
601 | { | |
602 | struct xfs_mount *mp = cur->bc_mp; | |
603 | struct xfs_inode *ip = cur->bc_private.b.ip; | |
604 | struct xfs_trans *tp = cur->bc_tp; | |
605 | xfs_fsblock_t fsbno = XFS_DADDR_TO_FSB(mp, XFS_BUF_ADDR(bp)); | |
606 | ||
607 | xfs_bmap_add_free(fsbno, 1, cur->bc_private.b.flist, mp); | |
608 | ip->i_d.di_nblocks--; | |
609 | ||
610 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
7d095257 | 611 | xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, -1L); |
d4b3a4b7 CH |
612 | xfs_trans_binval(tp, bp); |
613 | return 0; | |
614 | } | |
615 | ||
91cca5df CH |
616 | STATIC int |
617 | xfs_bmbt_get_minrecs( | |
618 | struct xfs_btree_cur *cur, | |
619 | int level) | |
620 | { | |
60197e8d CH |
621 | if (level == cur->bc_nlevels - 1) { |
622 | struct xfs_ifork *ifp; | |
623 | ||
624 | ifp = XFS_IFORK_PTR(cur->bc_private.b.ip, | |
625 | cur->bc_private.b.whichfork); | |
626 | ||
627 | return xfs_bmbt_maxrecs(cur->bc_mp, | |
628 | ifp->if_broot_bytes, level == 0) / 2; | |
629 | } | |
630 | ||
631 | return cur->bc_mp->m_bmap_dmnr[level != 0]; | |
91cca5df CH |
632 | } |
633 | ||
60197e8d | 634 | int |
ce5e42db CH |
635 | xfs_bmbt_get_maxrecs( |
636 | struct xfs_btree_cur *cur, | |
637 | int level) | |
638 | { | |
60197e8d CH |
639 | if (level == cur->bc_nlevels - 1) { |
640 | struct xfs_ifork *ifp; | |
641 | ||
642 | ifp = XFS_IFORK_PTR(cur->bc_private.b.ip, | |
643 | cur->bc_private.b.whichfork); | |
644 | ||
645 | return xfs_bmbt_maxrecs(cur->bc_mp, | |
646 | ifp->if_broot_bytes, level == 0); | |
647 | } | |
648 | ||
649 | return cur->bc_mp->m_bmap_dmxr[level != 0]; | |
650 | ||
ce5e42db CH |
651 | } |
652 | ||
4b22a571 CH |
653 | /* |
654 | * Get the maximum records we could store in the on-disk format. | |
655 | * | |
656 | * For non-root nodes this is equivalent to xfs_bmbt_get_maxrecs, but | |
657 | * for the root node this checks the available space in the dinode fork | |
658 | * so that we can resize the in-memory buffer to match it. After a | |
659 | * resize to the maximum size this function returns the same value | |
660 | * as xfs_bmbt_get_maxrecs for the root node, too. | |
661 | */ | |
662 | STATIC int | |
663 | xfs_bmbt_get_dmaxrecs( | |
664 | struct xfs_btree_cur *cur, | |
665 | int level) | |
666 | { | |
60197e8d CH |
667 | if (level != cur->bc_nlevels - 1) |
668 | return cur->bc_mp->m_bmap_dmxr[level != 0]; | |
669 | return xfs_bmdr_maxrecs(cur->bc_mp, cur->bc_private.b.forksize, | |
670 | level == 0); | |
4b22a571 CH |
671 | } |
672 | ||
fe033cc8 CH |
673 | STATIC void |
674 | xfs_bmbt_init_key_from_rec( | |
675 | union xfs_btree_key *key, | |
676 | union xfs_btree_rec *rec) | |
677 | { | |
678 | key->bmbt.br_startoff = | |
679 | cpu_to_be64(xfs_bmbt_disk_get_startoff(&rec->bmbt)); | |
680 | } | |
681 | ||
4b22a571 CH |
682 | STATIC void |
683 | xfs_bmbt_init_rec_from_key( | |
684 | union xfs_btree_key *key, | |
685 | union xfs_btree_rec *rec) | |
686 | { | |
687 | ASSERT(key->bmbt.br_startoff != 0); | |
688 | ||
689 | xfs_bmbt_disk_set_allf(&rec->bmbt, be64_to_cpu(key->bmbt.br_startoff), | |
690 | 0, 0, XFS_EXT_NORM); | |
691 | } | |
692 | ||
693 | STATIC void | |
694 | xfs_bmbt_init_rec_from_cur( | |
695 | struct xfs_btree_cur *cur, | |
696 | union xfs_btree_rec *rec) | |
697 | { | |
698 | xfs_bmbt_disk_set_all(&rec->bmbt, &cur->bc_rec.b); | |
699 | } | |
700 | ||
fe033cc8 CH |
701 | STATIC void |
702 | xfs_bmbt_init_ptr_from_cur( | |
703 | struct xfs_btree_cur *cur, | |
704 | union xfs_btree_ptr *ptr) | |
705 | { | |
706 | ptr->l = 0; | |
707 | } | |
708 | ||
709 | STATIC __int64_t | |
710 | xfs_bmbt_key_diff( | |
711 | struct xfs_btree_cur *cur, | |
712 | union xfs_btree_key *key) | |
713 | { | |
714 | return (__int64_t)be64_to_cpu(key->bmbt.br_startoff) - | |
715 | cur->bc_rec.b.br_startoff; | |
716 | } | |
717 | ||
4a26e66e CH |
718 | #ifdef DEBUG |
719 | STATIC int | |
720 | xfs_bmbt_keys_inorder( | |
721 | struct xfs_btree_cur *cur, | |
722 | union xfs_btree_key *k1, | |
723 | union xfs_btree_key *k2) | |
724 | { | |
725 | return be64_to_cpu(k1->bmbt.br_startoff) < | |
726 | be64_to_cpu(k2->bmbt.br_startoff); | |
727 | } | |
728 | ||
729 | STATIC int | |
730 | xfs_bmbt_recs_inorder( | |
731 | struct xfs_btree_cur *cur, | |
732 | union xfs_btree_rec *r1, | |
733 | union xfs_btree_rec *r2) | |
734 | { | |
735 | return xfs_bmbt_disk_get_startoff(&r1->bmbt) + | |
736 | xfs_bmbt_disk_get_blockcount(&r1->bmbt) <= | |
737 | xfs_bmbt_disk_get_startoff(&r2->bmbt); | |
738 | } | |
739 | #endif /* DEBUG */ | |
740 | ||
8c4ed633 CH |
741 | #ifdef XFS_BTREE_TRACE |
742 | ktrace_t *xfs_bmbt_trace_buf; | |
743 | ||
744 | STATIC void | |
745 | xfs_bmbt_trace_enter( | |
746 | struct xfs_btree_cur *cur, | |
747 | const char *func, | |
748 | char *s, | |
749 | int type, | |
750 | int line, | |
751 | __psunsigned_t a0, | |
752 | __psunsigned_t a1, | |
753 | __psunsigned_t a2, | |
754 | __psunsigned_t a3, | |
755 | __psunsigned_t a4, | |
756 | __psunsigned_t a5, | |
757 | __psunsigned_t a6, | |
758 | __psunsigned_t a7, | |
759 | __psunsigned_t a8, | |
760 | __psunsigned_t a9, | |
761 | __psunsigned_t a10) | |
762 | { | |
763 | struct xfs_inode *ip = cur->bc_private.b.ip; | |
764 | int whichfork = cur->bc_private.b.whichfork; | |
765 | ||
766 | ktrace_enter(xfs_bmbt_trace_buf, | |
767 | (void *)((__psint_t)type | (whichfork << 8) | (line << 16)), | |
768 | (void *)func, (void *)s, (void *)ip, (void *)cur, | |
769 | (void *)a0, (void *)a1, (void *)a2, (void *)a3, | |
770 | (void *)a4, (void *)a5, (void *)a6, (void *)a7, | |
771 | (void *)a8, (void *)a9, (void *)a10); | |
772 | ktrace_enter(ip->i_btrace, | |
773 | (void *)((__psint_t)type | (whichfork << 8) | (line << 16)), | |
774 | (void *)func, (void *)s, (void *)ip, (void *)cur, | |
775 | (void *)a0, (void *)a1, (void *)a2, (void *)a3, | |
776 | (void *)a4, (void *)a5, (void *)a6, (void *)a7, | |
777 | (void *)a8, (void *)a9, (void *)a10); | |
778 | } | |
779 | ||
780 | STATIC void | |
781 | xfs_bmbt_trace_cursor( | |
782 | struct xfs_btree_cur *cur, | |
783 | __uint32_t *s0, | |
784 | __uint64_t *l0, | |
785 | __uint64_t *l1) | |
786 | { | |
787 | struct xfs_bmbt_rec_host r; | |
788 | ||
789 | xfs_bmbt_set_all(&r, &cur->bc_rec.b); | |
790 | ||
791 | *s0 = (cur->bc_nlevels << 24) | | |
792 | (cur->bc_private.b.flags << 16) | | |
793 | cur->bc_private.b.allocated; | |
794 | *l0 = r.l0; | |
795 | *l1 = r.l1; | |
796 | } | |
797 | ||
798 | STATIC void | |
799 | xfs_bmbt_trace_key( | |
800 | struct xfs_btree_cur *cur, | |
801 | union xfs_btree_key *key, | |
802 | __uint64_t *l0, | |
803 | __uint64_t *l1) | |
804 | { | |
805 | *l0 = be64_to_cpu(key->bmbt.br_startoff); | |
806 | *l1 = 0; | |
807 | } | |
808 | ||
d96f8f89 ES |
809 | /* Endian flipping versions of the bmbt extraction functions */ |
810 | STATIC void | |
811 | xfs_bmbt_disk_get_all( | |
812 | xfs_bmbt_rec_t *r, | |
813 | xfs_bmbt_irec_t *s) | |
814 | { | |
815 | __xfs_bmbt_get_all(get_unaligned_be64(&r->l0), | |
816 | get_unaligned_be64(&r->l1), s); | |
817 | } | |
818 | ||
8c4ed633 CH |
819 | STATIC void |
820 | xfs_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 | ||
561f7d17 | 836 | static const struct xfs_btree_ops xfs_bmbt_ops = { |
65f1eaea CH |
837 | .rec_len = sizeof(xfs_bmbt_rec_t), |
838 | .key_len = sizeof(xfs_bmbt_key_t), | |
839 | ||
561f7d17 | 840 | .dup_cursor = xfs_bmbt_dup_cursor, |
4b22a571 | 841 | .update_cursor = xfs_bmbt_update_cursor, |
f5eb8e7c | 842 | .alloc_block = xfs_bmbt_alloc_block, |
d4b3a4b7 | 843 | .free_block = xfs_bmbt_free_block, |
ce5e42db | 844 | .get_maxrecs = xfs_bmbt_get_maxrecs, |
91cca5df | 845 | .get_minrecs = xfs_bmbt_get_minrecs, |
4b22a571 | 846 | .get_dmaxrecs = xfs_bmbt_get_dmaxrecs, |
fe033cc8 | 847 | .init_key_from_rec = xfs_bmbt_init_key_from_rec, |
4b22a571 CH |
848 | .init_rec_from_key = xfs_bmbt_init_rec_from_key, |
849 | .init_rec_from_cur = xfs_bmbt_init_rec_from_cur, | |
fe033cc8 CH |
850 | .init_ptr_from_cur = xfs_bmbt_init_ptr_from_cur, |
851 | .key_diff = xfs_bmbt_key_diff, | |
8c4ed633 | 852 | |
4a26e66e CH |
853 | #ifdef DEBUG |
854 | .keys_inorder = xfs_bmbt_keys_inorder, | |
855 | .recs_inorder = xfs_bmbt_recs_inorder, | |
856 | #endif | |
857 | ||
8c4ed633 CH |
858 | #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 | |
561f7d17 CH |
864 | }; |
865 | ||
866 | /* | |
867 | * Allocate a new bmap btree cursor. | |
868 | */ | |
869 | struct xfs_btree_cur * /* new bmap btree cursor */ | |
870 | xfs_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; | |
e99ab90d | 888 | cur->bc_flags = XFS_BTREE_LONG_PTRS | XFS_BTREE_ROOT_IN_INODE; |
561f7d17 CH |
889 | |
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 | } | |
60197e8d CH |
900 | |
901 | /* | |
902 | * Calculate number of records in a bmap btree block. | |
903 | */ | |
904 | int | |
905 | xfs_bmbt_maxrecs( | |
906 | struct xfs_mount *mp, | |
907 | int blocklen, | |
908 | int leaf) | |
909 | { | |
7cc95a82 | 910 | blocklen -= XFS_BMBT_BLOCK_LEN(mp); |
60197e8d CH |
911 | |
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 | */ | |
920 | int | |
921 | xfs_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 | } |