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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 | /* Endian flipping versions of the bmbt extraction functions */ |
206 | void | |
207 | xfs_bmbt_disk_get_all( | |
208 | xfs_bmbt_rec_t *r, | |
209 | xfs_bmbt_irec_t *s) | |
210 | { | |
ad1ad968 CH |
211 | __xfs_bmbt_get_all(get_unaligned_be64(&r->l0), |
212 | get_unaligned_be64(&r->l1), s); | |
1da177e4 LT |
213 | } |
214 | ||
215 | /* | |
216 | * Extract the blockcount field from an on disk bmap extent record. | |
217 | */ | |
218 | xfs_filblks_t | |
219 | xfs_bmbt_disk_get_blockcount( | |
220 | xfs_bmbt_rec_t *r) | |
221 | { | |
fb82557f | 222 | return (xfs_filblks_t)(be64_to_cpu(r->l1) & xfs_mask64lo(21)); |
1da177e4 LT |
223 | } |
224 | ||
1da177e4 LT |
225 | /* |
226 | * Extract the startoff field from a disk format bmap extent record. | |
227 | */ | |
228 | xfs_fileoff_t | |
229 | xfs_bmbt_disk_get_startoff( | |
230 | xfs_bmbt_rec_t *r) | |
231 | { | |
cd8b0a97 | 232 | return ((xfs_fileoff_t)be64_to_cpu(r->l0) & |
fb82557f | 233 | xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9; |
1da177e4 | 234 | } |
1da177e4 | 235 | |
1da177e4 | 236 | |
1da177e4 LT |
237 | /* |
238 | * Set all the fields in a bmap extent record from the arguments. | |
239 | */ | |
240 | void | |
241 | xfs_bmbt_set_allf( | |
8cba4344 CH |
242 | xfs_bmbt_rec_host_t *r, |
243 | xfs_fileoff_t startoff, | |
244 | xfs_fsblock_t startblock, | |
245 | xfs_filblks_t blockcount, | |
246 | xfs_exntst_t state) | |
1da177e4 | 247 | { |
8cba4344 CH |
248 | int extent_flag = (state == XFS_EXT_NORM) ? 0 : 1; |
249 | ||
250 | ASSERT(state == XFS_EXT_NORM || state == XFS_EXT_UNWRITTEN); | |
fb82557f ES |
251 | ASSERT((startoff & xfs_mask64hi(64-BMBT_STARTOFF_BITLEN)) == 0); |
252 | ASSERT((blockcount & xfs_mask64hi(64-BMBT_BLOCKCOUNT_BITLEN)) == 0); | |
1da177e4 | 253 | |
1da177e4 | 254 | #if XFS_BIG_BLKNOS |
fb82557f | 255 | ASSERT((startblock & xfs_mask64hi(64-BMBT_STARTBLOCK_BITLEN)) == 0); |
8cba4344 | 256 | |
1da177e4 | 257 | r->l0 = ((xfs_bmbt_rec_base_t)extent_flag << 63) | |
8cba4344 CH |
258 | ((xfs_bmbt_rec_base_t)startoff << 9) | |
259 | ((xfs_bmbt_rec_base_t)startblock >> 43); | |
260 | r->l1 = ((xfs_bmbt_rec_base_t)startblock << 21) | | |
261 | ((xfs_bmbt_rec_base_t)blockcount & | |
fb82557f | 262 | (xfs_bmbt_rec_base_t)xfs_mask64lo(21)); |
1da177e4 | 263 | #else /* !XFS_BIG_BLKNOS */ |
9d87c319 | 264 | if (isnullstartblock(startblock)) { |
1da177e4 | 265 | r->l0 = ((xfs_bmbt_rec_base_t)extent_flag << 63) | |
8cba4344 | 266 | ((xfs_bmbt_rec_base_t)startoff << 9) | |
fb82557f ES |
267 | (xfs_bmbt_rec_base_t)xfs_mask64lo(9); |
268 | r->l1 = xfs_mask64hi(11) | | |
8cba4344 CH |
269 | ((xfs_bmbt_rec_base_t)startblock << 21) | |
270 | ((xfs_bmbt_rec_base_t)blockcount & | |
fb82557f | 271 | (xfs_bmbt_rec_base_t)xfs_mask64lo(21)); |
1da177e4 LT |
272 | } else { |
273 | r->l0 = ((xfs_bmbt_rec_base_t)extent_flag << 63) | | |
8cba4344 CH |
274 | ((xfs_bmbt_rec_base_t)startoff << 9); |
275 | r->l1 = ((xfs_bmbt_rec_base_t)startblock << 21) | | |
276 | ((xfs_bmbt_rec_base_t)blockcount & | |
fb82557f | 277 | (xfs_bmbt_rec_base_t)xfs_mask64lo(21)); |
1da177e4 LT |
278 | } |
279 | #endif /* XFS_BIG_BLKNOS */ | |
280 | } | |
281 | ||
1da177e4 LT |
282 | /* |
283 | * Set all the fields in a bmap extent record from the uncompressed form. | |
284 | */ | |
285 | void | |
8cba4344 CH |
286 | xfs_bmbt_set_all( |
287 | xfs_bmbt_rec_host_t *r, | |
288 | xfs_bmbt_irec_t *s) | |
1da177e4 | 289 | { |
8cba4344 CH |
290 | xfs_bmbt_set_allf(r, s->br_startoff, s->br_startblock, |
291 | s->br_blockcount, s->br_state); | |
1da177e4 LT |
292 | } |
293 | ||
8cba4344 | 294 | |
1da177e4 LT |
295 | /* |
296 | * Set all the fields in a disk format bmap extent record from the arguments. | |
297 | */ | |
298 | void | |
299 | xfs_bmbt_disk_set_allf( | |
8cba4344 CH |
300 | xfs_bmbt_rec_t *r, |
301 | xfs_fileoff_t startoff, | |
302 | xfs_fsblock_t startblock, | |
303 | xfs_filblks_t blockcount, | |
304 | xfs_exntst_t state) | |
1da177e4 | 305 | { |
8cba4344 CH |
306 | int extent_flag = (state == XFS_EXT_NORM) ? 0 : 1; |
307 | ||
308 | ASSERT(state == XFS_EXT_NORM || state == XFS_EXT_UNWRITTEN); | |
fb82557f ES |
309 | ASSERT((startoff & xfs_mask64hi(64-BMBT_STARTOFF_BITLEN)) == 0); |
310 | ASSERT((blockcount & xfs_mask64hi(64-BMBT_BLOCKCOUNT_BITLEN)) == 0); | |
1da177e4 | 311 | |
1da177e4 | 312 | #if XFS_BIG_BLKNOS |
fb82557f | 313 | ASSERT((startblock & xfs_mask64hi(64-BMBT_STARTBLOCK_BITLEN)) == 0); |
8cba4344 | 314 | |
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) | | |
318 | ((xfs_bmbt_rec_base_t)startblock >> 43)); | |
cd8b0a97 | 319 | r->l1 = cpu_to_be64( |
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 /* !XFS_BIG_BLKNOS */ |
9d87c319 | 324 | if (isnullstartblock(startblock)) { |
cd8b0a97 | 325 | r->l0 = cpu_to_be64( |
8cba4344 CH |
326 | ((xfs_bmbt_rec_base_t)extent_flag << 63) | |
327 | ((xfs_bmbt_rec_base_t)startoff << 9) | | |
fb82557f ES |
328 | (xfs_bmbt_rec_base_t)xfs_mask64lo(9)); |
329 | r->l1 = cpu_to_be64(xfs_mask64hi(11) | | |
8cba4344 CH |
330 | ((xfs_bmbt_rec_base_t)startblock << 21) | |
331 | ((xfs_bmbt_rec_base_t)blockcount & | |
fb82557f | 332 | (xfs_bmbt_rec_base_t)xfs_mask64lo(21))); |
1da177e4 | 333 | } else { |
cd8b0a97 | 334 | r->l0 = cpu_to_be64( |
8cba4344 CH |
335 | ((xfs_bmbt_rec_base_t)extent_flag << 63) | |
336 | ((xfs_bmbt_rec_base_t)startoff << 9)); | |
cd8b0a97 | 337 | r->l1 = cpu_to_be64( |
8cba4344 CH |
338 | ((xfs_bmbt_rec_base_t)startblock << 21) | |
339 | ((xfs_bmbt_rec_base_t)blockcount & | |
fb82557f | 340 | (xfs_bmbt_rec_base_t)xfs_mask64lo(21))); |
1da177e4 LT |
341 | } |
342 | #endif /* XFS_BIG_BLKNOS */ | |
343 | } | |
8cba4344 CH |
344 | |
345 | /* | |
346 | * Set all the fields in a bmap extent record from the uncompressed form. | |
347 | */ | |
348 | void | |
349 | xfs_bmbt_disk_set_all( | |
350 | xfs_bmbt_rec_t *r, | |
351 | xfs_bmbt_irec_t *s) | |
352 | { | |
353 | xfs_bmbt_disk_set_allf(r, s->br_startoff, s->br_startblock, | |
354 | s->br_blockcount, s->br_state); | |
355 | } | |
1da177e4 LT |
356 | |
357 | /* | |
358 | * Set the blockcount field in a bmap extent record. | |
359 | */ | |
360 | void | |
361 | xfs_bmbt_set_blockcount( | |
a6f64d4a | 362 | xfs_bmbt_rec_host_t *r, |
1da177e4 LT |
363 | xfs_filblks_t v) |
364 | { | |
fb82557f ES |
365 | ASSERT((v & xfs_mask64hi(43)) == 0); |
366 | r->l1 = (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64hi(43)) | | |
367 | (xfs_bmbt_rec_base_t)(v & xfs_mask64lo(21)); | |
1da177e4 LT |
368 | } |
369 | ||
370 | /* | |
371 | * Set the startblock field in a bmap extent record. | |
372 | */ | |
373 | void | |
374 | xfs_bmbt_set_startblock( | |
a6f64d4a | 375 | xfs_bmbt_rec_host_t *r, |
1da177e4 LT |
376 | xfs_fsblock_t v) |
377 | { | |
378 | #if XFS_BIG_BLKNOS | |
fb82557f ES |
379 | ASSERT((v & xfs_mask64hi(12)) == 0); |
380 | r->l0 = (r->l0 & (xfs_bmbt_rec_base_t)xfs_mask64hi(55)) | | |
1da177e4 | 381 | (xfs_bmbt_rec_base_t)(v >> 43); |
fb82557f | 382 | r->l1 = (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64lo(21)) | |
1da177e4 LT |
383 | (xfs_bmbt_rec_base_t)(v << 21); |
384 | #else /* !XFS_BIG_BLKNOS */ | |
9d87c319 | 385 | if (isnullstartblock(v)) { |
fb82557f ES |
386 | r->l0 |= (xfs_bmbt_rec_base_t)xfs_mask64lo(9); |
387 | r->l1 = (xfs_bmbt_rec_base_t)xfs_mask64hi(11) | | |
1da177e4 | 388 | ((xfs_bmbt_rec_base_t)v << 21) | |
fb82557f | 389 | (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64lo(21)); |
1da177e4 | 390 | } else { |
fb82557f | 391 | r->l0 &= ~(xfs_bmbt_rec_base_t)xfs_mask64lo(9); |
1da177e4 | 392 | r->l1 = ((xfs_bmbt_rec_base_t)v << 21) | |
fb82557f | 393 | (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64lo(21)); |
1da177e4 LT |
394 | } |
395 | #endif /* XFS_BIG_BLKNOS */ | |
396 | } | |
397 | ||
398 | /* | |
399 | * Set the startoff field in a bmap extent record. | |
400 | */ | |
401 | void | |
402 | xfs_bmbt_set_startoff( | |
a6f64d4a | 403 | xfs_bmbt_rec_host_t *r, |
1da177e4 LT |
404 | xfs_fileoff_t v) |
405 | { | |
fb82557f ES |
406 | ASSERT((v & xfs_mask64hi(9)) == 0); |
407 | r->l0 = (r->l0 & (xfs_bmbt_rec_base_t) xfs_mask64hi(1)) | | |
1da177e4 | 408 | ((xfs_bmbt_rec_base_t)v << 9) | |
fb82557f | 409 | (r->l0 & (xfs_bmbt_rec_base_t)xfs_mask64lo(9)); |
1da177e4 LT |
410 | } |
411 | ||
412 | /* | |
413 | * Set the extent state field in a bmap extent record. | |
414 | */ | |
415 | void | |
416 | xfs_bmbt_set_state( | |
a6f64d4a | 417 | xfs_bmbt_rec_host_t *r, |
1da177e4 LT |
418 | xfs_exntst_t v) |
419 | { | |
420 | ASSERT(v == XFS_EXT_NORM || v == XFS_EXT_UNWRITTEN); | |
421 | if (v == XFS_EXT_NORM) | |
fb82557f | 422 | r->l0 &= xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN); |
1da177e4 | 423 | else |
fb82557f | 424 | r->l0 |= xfs_mask64hi(BMBT_EXNTFLAG_BITLEN); |
1da177e4 LT |
425 | } |
426 | ||
427 | /* | |
428 | * Convert in-memory form of btree root to on-disk form. | |
429 | */ | |
430 | void | |
431 | xfs_bmbt_to_bmdr( | |
60197e8d | 432 | struct xfs_mount *mp, |
7cc95a82 | 433 | struct xfs_btree_block *rblock, |
1da177e4 LT |
434 | int rblocklen, |
435 | xfs_bmdr_block_t *dblock, | |
436 | int dblocklen) | |
437 | { | |
438 | int dmxr; | |
439 | xfs_bmbt_key_t *fkp; | |
576039cf | 440 | __be64 *fpp; |
1da177e4 | 441 | xfs_bmbt_key_t *tkp; |
576039cf | 442 | __be64 *tpp; |
1da177e4 | 443 | |
16259e7d | 444 | ASSERT(be32_to_cpu(rblock->bb_magic) == XFS_BMAP_MAGIC); |
7cc95a82 CH |
445 | ASSERT(be64_to_cpu(rblock->bb_u.l.bb_leftsib) == NULLDFSBNO); |
446 | ASSERT(be64_to_cpu(rblock->bb_u.l.bb_rightsib) == NULLDFSBNO); | |
16259e7d CH |
447 | ASSERT(be16_to_cpu(rblock->bb_level) > 0); |
448 | dblock->bb_level = rblock->bb_level; | |
449 | dblock->bb_numrecs = rblock->bb_numrecs; | |
60197e8d | 450 | dmxr = xfs_bmdr_maxrecs(mp, dblocklen, 0); |
136341b4 CH |
451 | fkp = XFS_BMBT_KEY_ADDR(mp, rblock, 1); |
452 | tkp = XFS_BMDR_KEY_ADDR(dblock, 1); | |
60197e8d | 453 | fpp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, rblocklen); |
136341b4 | 454 | tpp = XFS_BMDR_PTR_ADDR(dblock, 1, dmxr); |
16259e7d | 455 | dmxr = be16_to_cpu(dblock->bb_numrecs); |
1da177e4 | 456 | memcpy(tkp, fkp, sizeof(*fkp) * dmxr); |
576039cf | 457 | memcpy(tpp, fpp, sizeof(*fpp) * dmxr); |
1da177e4 LT |
458 | } |
459 | ||
1da177e4 | 460 | /* |
4eea22f0 | 461 | * Check extent records, which have just been read, for |
1da177e4 LT |
462 | * any bit in the extent flag field. ASSERT on debug |
463 | * kernels, as this condition should not occur. | |
464 | * Return an error condition (1) if any flags found, | |
465 | * otherwise return 0. | |
466 | */ | |
467 | ||
468 | int | |
469 | xfs_check_nostate_extents( | |
4eea22f0 MK |
470 | xfs_ifork_t *ifp, |
471 | xfs_extnum_t idx, | |
1da177e4 LT |
472 | xfs_extnum_t num) |
473 | { | |
4eea22f0 | 474 | for (; num > 0; num--, idx++) { |
a6f64d4a | 475 | xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, idx); |
1da177e4 LT |
476 | if ((ep->l0 >> |
477 | (64 - BMBT_EXNTFLAG_BITLEN)) != 0) { | |
478 | ASSERT(0); | |
479 | return 1; | |
480 | } | |
481 | } | |
482 | return 0; | |
483 | } | |
561f7d17 CH |
484 | |
485 | ||
486 | STATIC struct xfs_btree_cur * | |
487 | xfs_bmbt_dup_cursor( | |
488 | struct xfs_btree_cur *cur) | |
489 | { | |
490 | struct xfs_btree_cur *new; | |
491 | ||
492 | new = xfs_bmbt_init_cursor(cur->bc_mp, cur->bc_tp, | |
493 | cur->bc_private.b.ip, cur->bc_private.b.whichfork); | |
494 | ||
495 | /* | |
496 | * Copy the firstblock, flist, and flags values, | |
497 | * since init cursor doesn't get them. | |
498 | */ | |
499 | new->bc_private.b.firstblock = cur->bc_private.b.firstblock; | |
500 | new->bc_private.b.flist = cur->bc_private.b.flist; | |
501 | new->bc_private.b.flags = cur->bc_private.b.flags; | |
502 | ||
503 | return new; | |
504 | } | |
505 | ||
4b22a571 CH |
506 | STATIC void |
507 | xfs_bmbt_update_cursor( | |
508 | struct xfs_btree_cur *src, | |
509 | struct xfs_btree_cur *dst) | |
510 | { | |
511 | ASSERT((dst->bc_private.b.firstblock != NULLFSBLOCK) || | |
512 | (dst->bc_private.b.ip->i_d.di_flags & XFS_DIFLAG_REALTIME)); | |
513 | ASSERT(dst->bc_private.b.flist == src->bc_private.b.flist); | |
514 | ||
515 | dst->bc_private.b.allocated += src->bc_private.b.allocated; | |
516 | dst->bc_private.b.firstblock = src->bc_private.b.firstblock; | |
517 | ||
518 | src->bc_private.b.allocated = 0; | |
519 | } | |
520 | ||
f5eb8e7c CH |
521 | STATIC int |
522 | xfs_bmbt_alloc_block( | |
523 | struct xfs_btree_cur *cur, | |
524 | union xfs_btree_ptr *start, | |
525 | union xfs_btree_ptr *new, | |
526 | int length, | |
527 | int *stat) | |
528 | { | |
529 | xfs_alloc_arg_t args; /* block allocation args */ | |
530 | int error; /* error return value */ | |
531 | ||
532 | memset(&args, 0, sizeof(args)); | |
533 | args.tp = cur->bc_tp; | |
534 | args.mp = cur->bc_mp; | |
535 | args.fsbno = cur->bc_private.b.firstblock; | |
536 | args.firstblock = args.fsbno; | |
537 | ||
538 | if (args.fsbno == NULLFSBLOCK) { | |
539 | args.fsbno = be64_to_cpu(start->l); | |
540 | args.type = XFS_ALLOCTYPE_START_BNO; | |
541 | /* | |
542 | * Make sure there is sufficient room left in the AG to | |
543 | * complete a full tree split for an extent insert. If | |
544 | * we are converting the middle part of an extent then | |
545 | * we may need space for two tree splits. | |
546 | * | |
547 | * We are relying on the caller to make the correct block | |
548 | * reservation for this operation to succeed. If the | |
549 | * reservation amount is insufficient then we may fail a | |
550 | * block allocation here and corrupt the filesystem. | |
551 | */ | |
552 | args.minleft = xfs_trans_get_block_res(args.tp); | |
553 | } else if (cur->bc_private.b.flist->xbf_low) { | |
554 | args.type = XFS_ALLOCTYPE_START_BNO; | |
555 | } else { | |
556 | args.type = XFS_ALLOCTYPE_NEAR_BNO; | |
557 | } | |
558 | ||
559 | args.minlen = args.maxlen = args.prod = 1; | |
560 | args.wasdel = cur->bc_private.b.flags & XFS_BTCUR_BPRV_WASDEL; | |
561 | if (!args.wasdel && xfs_trans_get_block_res(args.tp) == 0) { | |
562 | error = XFS_ERROR(ENOSPC); | |
563 | goto error0; | |
564 | } | |
565 | error = xfs_alloc_vextent(&args); | |
566 | if (error) | |
567 | goto error0; | |
568 | ||
569 | if (args.fsbno == NULLFSBLOCK && args.minleft) { | |
570 | /* | |
571 | * Could not find an AG with enough free space to satisfy | |
572 | * a full btree split. Try again without minleft and if | |
573 | * successful activate the lowspace algorithm. | |
574 | */ | |
575 | args.fsbno = 0; | |
576 | args.type = XFS_ALLOCTYPE_FIRST_AG; | |
577 | args.minleft = 0; | |
578 | error = xfs_alloc_vextent(&args); | |
579 | if (error) | |
580 | goto error0; | |
581 | cur->bc_private.b.flist->xbf_low = 1; | |
582 | } | |
583 | if (args.fsbno == NULLFSBLOCK) { | |
584 | XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT); | |
585 | *stat = 0; | |
586 | return 0; | |
587 | } | |
588 | ASSERT(args.len == 1); | |
589 | cur->bc_private.b.firstblock = args.fsbno; | |
590 | cur->bc_private.b.allocated++; | |
591 | cur->bc_private.b.ip->i_d.di_nblocks++; | |
592 | xfs_trans_log_inode(args.tp, cur->bc_private.b.ip, XFS_ILOG_CORE); | |
593 | XFS_TRANS_MOD_DQUOT_BYINO(args.mp, args.tp, cur->bc_private.b.ip, | |
594 | XFS_TRANS_DQ_BCOUNT, 1L); | |
595 | ||
596 | new->l = cpu_to_be64(args.fsbno); | |
597 | ||
598 | XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT); | |
599 | *stat = 1; | |
600 | return 0; | |
601 | ||
602 | error0: | |
603 | XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR); | |
604 | return error; | |
605 | } | |
606 | ||
d4b3a4b7 CH |
607 | STATIC int |
608 | xfs_bmbt_free_block( | |
609 | struct xfs_btree_cur *cur, | |
610 | struct xfs_buf *bp) | |
611 | { | |
612 | struct xfs_mount *mp = cur->bc_mp; | |
613 | struct xfs_inode *ip = cur->bc_private.b.ip; | |
614 | struct xfs_trans *tp = cur->bc_tp; | |
615 | xfs_fsblock_t fsbno = XFS_DADDR_TO_FSB(mp, XFS_BUF_ADDR(bp)); | |
616 | ||
617 | xfs_bmap_add_free(fsbno, 1, cur->bc_private.b.flist, mp); | |
618 | ip->i_d.di_nblocks--; | |
619 | ||
620 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
621 | XFS_TRANS_MOD_DQUOT_BYINO(mp, tp, ip, XFS_TRANS_DQ_BCOUNT, -1L); | |
622 | xfs_trans_binval(tp, bp); | |
623 | return 0; | |
624 | } | |
625 | ||
91cca5df CH |
626 | STATIC int |
627 | xfs_bmbt_get_minrecs( | |
628 | struct xfs_btree_cur *cur, | |
629 | int level) | |
630 | { | |
60197e8d CH |
631 | if (level == cur->bc_nlevels - 1) { |
632 | struct xfs_ifork *ifp; | |
633 | ||
634 | ifp = XFS_IFORK_PTR(cur->bc_private.b.ip, | |
635 | cur->bc_private.b.whichfork); | |
636 | ||
637 | return xfs_bmbt_maxrecs(cur->bc_mp, | |
638 | ifp->if_broot_bytes, level == 0) / 2; | |
639 | } | |
640 | ||
641 | return cur->bc_mp->m_bmap_dmnr[level != 0]; | |
91cca5df CH |
642 | } |
643 | ||
60197e8d | 644 | int |
ce5e42db CH |
645 | xfs_bmbt_get_maxrecs( |
646 | struct xfs_btree_cur *cur, | |
647 | int level) | |
648 | { | |
60197e8d CH |
649 | if (level == cur->bc_nlevels - 1) { |
650 | struct xfs_ifork *ifp; | |
651 | ||
652 | ifp = XFS_IFORK_PTR(cur->bc_private.b.ip, | |
653 | cur->bc_private.b.whichfork); | |
654 | ||
655 | return xfs_bmbt_maxrecs(cur->bc_mp, | |
656 | ifp->if_broot_bytes, level == 0); | |
657 | } | |
658 | ||
659 | return cur->bc_mp->m_bmap_dmxr[level != 0]; | |
660 | ||
ce5e42db CH |
661 | } |
662 | ||
4b22a571 CH |
663 | /* |
664 | * Get the maximum records we could store in the on-disk format. | |
665 | * | |
666 | * For non-root nodes this is equivalent to xfs_bmbt_get_maxrecs, but | |
667 | * for the root node this checks the available space in the dinode fork | |
668 | * so that we can resize the in-memory buffer to match it. After a | |
669 | * resize to the maximum size this function returns the same value | |
670 | * as xfs_bmbt_get_maxrecs for the root node, too. | |
671 | */ | |
672 | STATIC int | |
673 | xfs_bmbt_get_dmaxrecs( | |
674 | struct xfs_btree_cur *cur, | |
675 | int level) | |
676 | { | |
60197e8d CH |
677 | if (level != cur->bc_nlevels - 1) |
678 | return cur->bc_mp->m_bmap_dmxr[level != 0]; | |
679 | return xfs_bmdr_maxrecs(cur->bc_mp, cur->bc_private.b.forksize, | |
680 | level == 0); | |
4b22a571 CH |
681 | } |
682 | ||
fe033cc8 CH |
683 | STATIC void |
684 | xfs_bmbt_init_key_from_rec( | |
685 | union xfs_btree_key *key, | |
686 | union xfs_btree_rec *rec) | |
687 | { | |
688 | key->bmbt.br_startoff = | |
689 | cpu_to_be64(xfs_bmbt_disk_get_startoff(&rec->bmbt)); | |
690 | } | |
691 | ||
4b22a571 CH |
692 | STATIC void |
693 | xfs_bmbt_init_rec_from_key( | |
694 | union xfs_btree_key *key, | |
695 | union xfs_btree_rec *rec) | |
696 | { | |
697 | ASSERT(key->bmbt.br_startoff != 0); | |
698 | ||
699 | xfs_bmbt_disk_set_allf(&rec->bmbt, be64_to_cpu(key->bmbt.br_startoff), | |
700 | 0, 0, XFS_EXT_NORM); | |
701 | } | |
702 | ||
703 | STATIC void | |
704 | xfs_bmbt_init_rec_from_cur( | |
705 | struct xfs_btree_cur *cur, | |
706 | union xfs_btree_rec *rec) | |
707 | { | |
708 | xfs_bmbt_disk_set_all(&rec->bmbt, &cur->bc_rec.b); | |
709 | } | |
710 | ||
fe033cc8 CH |
711 | STATIC void |
712 | xfs_bmbt_init_ptr_from_cur( | |
713 | struct xfs_btree_cur *cur, | |
714 | union xfs_btree_ptr *ptr) | |
715 | { | |
716 | ptr->l = 0; | |
717 | } | |
718 | ||
719 | STATIC __int64_t | |
720 | xfs_bmbt_key_diff( | |
721 | struct xfs_btree_cur *cur, | |
722 | union xfs_btree_key *key) | |
723 | { | |
724 | return (__int64_t)be64_to_cpu(key->bmbt.br_startoff) - | |
725 | cur->bc_rec.b.br_startoff; | |
726 | } | |
727 | ||
4a26e66e CH |
728 | #ifdef DEBUG |
729 | STATIC int | |
730 | xfs_bmbt_keys_inorder( | |
731 | struct xfs_btree_cur *cur, | |
732 | union xfs_btree_key *k1, | |
733 | union xfs_btree_key *k2) | |
734 | { | |
735 | return be64_to_cpu(k1->bmbt.br_startoff) < | |
736 | be64_to_cpu(k2->bmbt.br_startoff); | |
737 | } | |
738 | ||
739 | STATIC int | |
740 | xfs_bmbt_recs_inorder( | |
741 | struct xfs_btree_cur *cur, | |
742 | union xfs_btree_rec *r1, | |
743 | union xfs_btree_rec *r2) | |
744 | { | |
745 | return xfs_bmbt_disk_get_startoff(&r1->bmbt) + | |
746 | xfs_bmbt_disk_get_blockcount(&r1->bmbt) <= | |
747 | xfs_bmbt_disk_get_startoff(&r2->bmbt); | |
748 | } | |
749 | #endif /* DEBUG */ | |
750 | ||
8c4ed633 CH |
751 | #ifdef XFS_BTREE_TRACE |
752 | ktrace_t *xfs_bmbt_trace_buf; | |
753 | ||
754 | STATIC void | |
755 | xfs_bmbt_trace_enter( | |
756 | struct xfs_btree_cur *cur, | |
757 | const char *func, | |
758 | char *s, | |
759 | int type, | |
760 | int line, | |
761 | __psunsigned_t a0, | |
762 | __psunsigned_t a1, | |
763 | __psunsigned_t a2, | |
764 | __psunsigned_t a3, | |
765 | __psunsigned_t a4, | |
766 | __psunsigned_t a5, | |
767 | __psunsigned_t a6, | |
768 | __psunsigned_t a7, | |
769 | __psunsigned_t a8, | |
770 | __psunsigned_t a9, | |
771 | __psunsigned_t a10) | |
772 | { | |
773 | struct xfs_inode *ip = cur->bc_private.b.ip; | |
774 | int whichfork = cur->bc_private.b.whichfork; | |
775 | ||
776 | ktrace_enter(xfs_bmbt_trace_buf, | |
777 | (void *)((__psint_t)type | (whichfork << 8) | (line << 16)), | |
778 | (void *)func, (void *)s, (void *)ip, (void *)cur, | |
779 | (void *)a0, (void *)a1, (void *)a2, (void *)a3, | |
780 | (void *)a4, (void *)a5, (void *)a6, (void *)a7, | |
781 | (void *)a8, (void *)a9, (void *)a10); | |
782 | ktrace_enter(ip->i_btrace, | |
783 | (void *)((__psint_t)type | (whichfork << 8) | (line << 16)), | |
784 | (void *)func, (void *)s, (void *)ip, (void *)cur, | |
785 | (void *)a0, (void *)a1, (void *)a2, (void *)a3, | |
786 | (void *)a4, (void *)a5, (void *)a6, (void *)a7, | |
787 | (void *)a8, (void *)a9, (void *)a10); | |
788 | } | |
789 | ||
790 | STATIC void | |
791 | xfs_bmbt_trace_cursor( | |
792 | struct xfs_btree_cur *cur, | |
793 | __uint32_t *s0, | |
794 | __uint64_t *l0, | |
795 | __uint64_t *l1) | |
796 | { | |
797 | struct xfs_bmbt_rec_host r; | |
798 | ||
799 | xfs_bmbt_set_all(&r, &cur->bc_rec.b); | |
800 | ||
801 | *s0 = (cur->bc_nlevels << 24) | | |
802 | (cur->bc_private.b.flags << 16) | | |
803 | cur->bc_private.b.allocated; | |
804 | *l0 = r.l0; | |
805 | *l1 = r.l1; | |
806 | } | |
807 | ||
808 | STATIC void | |
809 | xfs_bmbt_trace_key( | |
810 | struct xfs_btree_cur *cur, | |
811 | union xfs_btree_key *key, | |
812 | __uint64_t *l0, | |
813 | __uint64_t *l1) | |
814 | { | |
815 | *l0 = be64_to_cpu(key->bmbt.br_startoff); | |
816 | *l1 = 0; | |
817 | } | |
818 | ||
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 | } |