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" |
632b89e8 | 20 | #include "xfs_shared.h" |
6ca1c906 | 21 | #include "xfs_format.h" |
239880ef DC |
22 | #include "xfs_log_format.h" |
23 | #include "xfs_trans_resv.h" | |
a844f451 | 24 | #include "xfs_bit.h" |
1da177e4 LT |
25 | #include "xfs_sb.h" |
26 | #include "xfs_ag.h" | |
1da177e4 | 27 | #include "xfs_mount.h" |
1da177e4 | 28 | #include "xfs_inode.h" |
239880ef | 29 | #include "xfs_trans.h" |
a844f451 | 30 | #include "xfs_inode_item.h" |
1da177e4 | 31 | #include "xfs_alloc.h" |
a844f451 | 32 | #include "xfs_btree.h" |
a4fbe6ab | 33 | #include "xfs_bmap_btree.h" |
1da177e4 LT |
34 | #include "xfs_bmap.h" |
35 | #include "xfs_error.h" | |
36 | #include "xfs_quota.h" | |
3d3e6f64 | 37 | #include "xfs_trace.h" |
ee1a47ab | 38 | #include "xfs_cksum.h" |
a4fbe6ab | 39 | #include "xfs_dinode.h" |
1da177e4 | 40 | |
1da177e4 LT |
41 | /* |
42 | * Determine the extent state. | |
43 | */ | |
44 | /* ARGSUSED */ | |
45 | STATIC xfs_exntst_t | |
46 | xfs_extent_state( | |
47 | xfs_filblks_t blks, | |
48 | int extent_flag) | |
49 | { | |
50 | if (extent_flag) { | |
51 | ASSERT(blks != 0); /* saved for DMIG */ | |
52 | return XFS_EXT_UNWRITTEN; | |
53 | } | |
54 | return XFS_EXT_NORM; | |
55 | } | |
56 | ||
1da177e4 LT |
57 | /* |
58 | * Convert on-disk form of btree root to in-memory form. | |
59 | */ | |
60 | void | |
61 | xfs_bmdr_to_bmbt( | |
ee1a47ab | 62 | struct xfs_inode *ip, |
1da177e4 LT |
63 | xfs_bmdr_block_t *dblock, |
64 | int dblocklen, | |
7cc95a82 | 65 | struct xfs_btree_block *rblock, |
1da177e4 LT |
66 | int rblocklen) |
67 | { | |
ee1a47ab | 68 | struct xfs_mount *mp = ip->i_mount; |
1da177e4 LT |
69 | int dmxr; |
70 | xfs_bmbt_key_t *fkp; | |
576039cf | 71 | __be64 *fpp; |
1da177e4 | 72 | xfs_bmbt_key_t *tkp; |
576039cf | 73 | __be64 *tpp; |
1da177e4 | 74 | |
ee1a47ab CH |
75 | if (xfs_sb_version_hascrc(&mp->m_sb)) |
76 | xfs_btree_init_block_int(mp, rblock, XFS_BUF_DADDR_NULL, | |
77 | XFS_BMAP_CRC_MAGIC, 0, 0, ip->i_ino, | |
78 | XFS_BTREE_LONG_PTRS | XFS_BTREE_CRC_BLOCKS); | |
79 | else | |
80 | xfs_btree_init_block_int(mp, rblock, XFS_BUF_DADDR_NULL, | |
81 | XFS_BMAP_MAGIC, 0, 0, ip->i_ino, | |
82 | XFS_BTREE_LONG_PTRS); | |
83 | ||
16259e7d CH |
84 | rblock->bb_level = dblock->bb_level; |
85 | ASSERT(be16_to_cpu(rblock->bb_level) > 0); | |
86 | rblock->bb_numrecs = dblock->bb_numrecs; | |
152d93b7 | 87 | dmxr = xfs_bmdr_maxrecs(dblocklen, 0); |
136341b4 CH |
88 | fkp = XFS_BMDR_KEY_ADDR(dblock, 1); |
89 | tkp = XFS_BMBT_KEY_ADDR(mp, rblock, 1); | |
90 | fpp = XFS_BMDR_PTR_ADDR(dblock, 1, dmxr); | |
60197e8d | 91 | tpp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, rblocklen); |
16259e7d | 92 | dmxr = be16_to_cpu(dblock->bb_numrecs); |
1da177e4 | 93 | memcpy(tkp, fkp, sizeof(*fkp) * dmxr); |
576039cf | 94 | memcpy(tpp, fpp, sizeof(*fpp) * dmxr); |
1da177e4 LT |
95 | } |
96 | ||
1da177e4 LT |
97 | /* |
98 | * Convert a compressed bmap extent record to an uncompressed form. | |
99 | * This code must be in sync with the routines xfs_bmbt_get_startoff, | |
100 | * xfs_bmbt_get_startblock, xfs_bmbt_get_blockcount and xfs_bmbt_get_state. | |
101 | */ | |
b8f82a4a | 102 | STATIC 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 | */ | |
5d77c0dc | 338 | STATIC void |
8cba4344 CH |
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 | |
ee1a47ab CH |
434 | if (xfs_sb_version_hascrc(&mp->m_sb)) { |
435 | ASSERT(rblock->bb_magic == cpu_to_be32(XFS_BMAP_CRC_MAGIC)); | |
436 | ASSERT(uuid_equal(&rblock->bb_u.l.bb_uuid, &mp->m_sb.sb_uuid)); | |
437 | ASSERT(rblock->bb_u.l.bb_blkno == | |
438 | cpu_to_be64(XFS_BUF_DADDR_NULL)); | |
439 | } else | |
440 | ASSERT(rblock->bb_magic == cpu_to_be32(XFS_BMAP_MAGIC)); | |
69ef921b CH |
441 | ASSERT(rblock->bb_u.l.bb_leftsib == cpu_to_be64(NULLDFSBNO)); |
442 | ASSERT(rblock->bb_u.l.bb_rightsib == cpu_to_be64(NULLDFSBNO)); | |
443 | ASSERT(rblock->bb_level != 0); | |
16259e7d CH |
444 | dblock->bb_level = rblock->bb_level; |
445 | dblock->bb_numrecs = rblock->bb_numrecs; | |
152d93b7 | 446 | dmxr = xfs_bmdr_maxrecs(dblocklen, 0); |
136341b4 CH |
447 | fkp = XFS_BMBT_KEY_ADDR(mp, rblock, 1); |
448 | tkp = XFS_BMDR_KEY_ADDR(dblock, 1); | |
60197e8d | 449 | fpp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, rblocklen); |
136341b4 | 450 | tpp = XFS_BMDR_PTR_ADDR(dblock, 1, dmxr); |
16259e7d | 451 | dmxr = be16_to_cpu(dblock->bb_numrecs); |
1da177e4 | 452 | memcpy(tkp, fkp, sizeof(*fkp) * dmxr); |
576039cf | 453 | memcpy(tpp, fpp, sizeof(*fpp) * dmxr); |
1da177e4 LT |
454 | } |
455 | ||
1da177e4 | 456 | /* |
4eea22f0 | 457 | * Check extent records, which have just been read, for |
1da177e4 LT |
458 | * any bit in the extent flag field. ASSERT on debug |
459 | * kernels, as this condition should not occur. | |
460 | * Return an error condition (1) if any flags found, | |
461 | * otherwise return 0. | |
462 | */ | |
463 | ||
464 | int | |
465 | xfs_check_nostate_extents( | |
4eea22f0 MK |
466 | xfs_ifork_t *ifp, |
467 | xfs_extnum_t idx, | |
1da177e4 LT |
468 | xfs_extnum_t num) |
469 | { | |
4eea22f0 | 470 | for (; num > 0; num--, idx++) { |
a6f64d4a | 471 | xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, idx); |
1da177e4 LT |
472 | if ((ep->l0 >> |
473 | (64 - BMBT_EXNTFLAG_BITLEN)) != 0) { | |
474 | ASSERT(0); | |
475 | return 1; | |
476 | } | |
477 | } | |
478 | return 0; | |
479 | } | |
561f7d17 CH |
480 | |
481 | ||
482 | STATIC struct xfs_btree_cur * | |
483 | xfs_bmbt_dup_cursor( | |
484 | struct xfs_btree_cur *cur) | |
485 | { | |
486 | struct xfs_btree_cur *new; | |
487 | ||
488 | new = xfs_bmbt_init_cursor(cur->bc_mp, cur->bc_tp, | |
489 | cur->bc_private.b.ip, cur->bc_private.b.whichfork); | |
490 | ||
491 | /* | |
492 | * Copy the firstblock, flist, and flags values, | |
493 | * since init cursor doesn't get them. | |
494 | */ | |
495 | new->bc_private.b.firstblock = cur->bc_private.b.firstblock; | |
496 | new->bc_private.b.flist = cur->bc_private.b.flist; | |
497 | new->bc_private.b.flags = cur->bc_private.b.flags; | |
498 | ||
499 | return new; | |
500 | } | |
501 | ||
4b22a571 CH |
502 | STATIC void |
503 | xfs_bmbt_update_cursor( | |
504 | struct xfs_btree_cur *src, | |
505 | struct xfs_btree_cur *dst) | |
506 | { | |
507 | ASSERT((dst->bc_private.b.firstblock != NULLFSBLOCK) || | |
508 | (dst->bc_private.b.ip->i_d.di_flags & XFS_DIFLAG_REALTIME)); | |
509 | ASSERT(dst->bc_private.b.flist == src->bc_private.b.flist); | |
510 | ||
511 | dst->bc_private.b.allocated += src->bc_private.b.allocated; | |
512 | dst->bc_private.b.firstblock = src->bc_private.b.firstblock; | |
513 | ||
514 | src->bc_private.b.allocated = 0; | |
515 | } | |
516 | ||
f5eb8e7c CH |
517 | STATIC int |
518 | xfs_bmbt_alloc_block( | |
519 | struct xfs_btree_cur *cur, | |
520 | union xfs_btree_ptr *start, | |
521 | union xfs_btree_ptr *new, | |
522 | int length, | |
523 | int *stat) | |
524 | { | |
525 | xfs_alloc_arg_t args; /* block allocation args */ | |
526 | int error; /* error return value */ | |
527 | ||
528 | memset(&args, 0, sizeof(args)); | |
529 | args.tp = cur->bc_tp; | |
530 | args.mp = cur->bc_mp; | |
531 | args.fsbno = cur->bc_private.b.firstblock; | |
532 | args.firstblock = args.fsbno; | |
533 | ||
534 | if (args.fsbno == NULLFSBLOCK) { | |
535 | args.fsbno = be64_to_cpu(start->l); | |
536 | args.type = XFS_ALLOCTYPE_START_BNO; | |
537 | /* | |
538 | * Make sure there is sufficient room left in the AG to | |
539 | * complete a full tree split for an extent insert. If | |
540 | * we are converting the middle part of an extent then | |
541 | * we may need space for two tree splits. | |
542 | * | |
543 | * We are relying on the caller to make the correct block | |
544 | * reservation for this operation to succeed. If the | |
545 | * reservation amount is insufficient then we may fail a | |
546 | * block allocation here and corrupt the filesystem. | |
547 | */ | |
548 | args.minleft = xfs_trans_get_block_res(args.tp); | |
549 | } else if (cur->bc_private.b.flist->xbf_low) { | |
550 | args.type = XFS_ALLOCTYPE_START_BNO; | |
551 | } else { | |
552 | args.type = XFS_ALLOCTYPE_NEAR_BNO; | |
553 | } | |
554 | ||
555 | args.minlen = args.maxlen = args.prod = 1; | |
556 | args.wasdel = cur->bc_private.b.flags & XFS_BTCUR_BPRV_WASDEL; | |
557 | if (!args.wasdel && xfs_trans_get_block_res(args.tp) == 0) { | |
558 | error = XFS_ERROR(ENOSPC); | |
559 | goto error0; | |
560 | } | |
561 | error = xfs_alloc_vextent(&args); | |
562 | if (error) | |
563 | goto error0; | |
564 | ||
565 | if (args.fsbno == NULLFSBLOCK && args.minleft) { | |
566 | /* | |
567 | * Could not find an AG with enough free space to satisfy | |
568 | * a full btree split. Try again without minleft and if | |
569 | * successful activate the lowspace algorithm. | |
570 | */ | |
571 | args.fsbno = 0; | |
572 | args.type = XFS_ALLOCTYPE_FIRST_AG; | |
573 | args.minleft = 0; | |
574 | error = xfs_alloc_vextent(&args); | |
575 | if (error) | |
576 | goto error0; | |
577 | cur->bc_private.b.flist->xbf_low = 1; | |
578 | } | |
579 | if (args.fsbno == NULLFSBLOCK) { | |
580 | XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT); | |
581 | *stat = 0; | |
582 | return 0; | |
583 | } | |
584 | ASSERT(args.len == 1); | |
585 | cur->bc_private.b.firstblock = args.fsbno; | |
586 | cur->bc_private.b.allocated++; | |
587 | cur->bc_private.b.ip->i_d.di_nblocks++; | |
588 | xfs_trans_log_inode(args.tp, cur->bc_private.b.ip, XFS_ILOG_CORE); | |
7d095257 | 589 | xfs_trans_mod_dquot_byino(args.tp, cur->bc_private.b.ip, |
f5eb8e7c CH |
590 | XFS_TRANS_DQ_BCOUNT, 1L); |
591 | ||
592 | new->l = cpu_to_be64(args.fsbno); | |
593 | ||
594 | XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT); | |
595 | *stat = 1; | |
596 | return 0; | |
597 | ||
598 | error0: | |
599 | XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR); | |
600 | return error; | |
601 | } | |
602 | ||
d4b3a4b7 CH |
603 | STATIC int |
604 | xfs_bmbt_free_block( | |
605 | struct xfs_btree_cur *cur, | |
606 | struct xfs_buf *bp) | |
607 | { | |
608 | struct xfs_mount *mp = cur->bc_mp; | |
609 | struct xfs_inode *ip = cur->bc_private.b.ip; | |
610 | struct xfs_trans *tp = cur->bc_tp; | |
611 | xfs_fsblock_t fsbno = XFS_DADDR_TO_FSB(mp, XFS_BUF_ADDR(bp)); | |
612 | ||
613 | xfs_bmap_add_free(fsbno, 1, cur->bc_private.b.flist, mp); | |
614 | ip->i_d.di_nblocks--; | |
615 | ||
616 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); | |
7d095257 | 617 | xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, -1L); |
d4b3a4b7 CH |
618 | xfs_trans_binval(tp, bp); |
619 | return 0; | |
620 | } | |
621 | ||
91cca5df CH |
622 | STATIC int |
623 | xfs_bmbt_get_minrecs( | |
624 | struct xfs_btree_cur *cur, | |
625 | int level) | |
626 | { | |
60197e8d CH |
627 | if (level == cur->bc_nlevels - 1) { |
628 | struct xfs_ifork *ifp; | |
629 | ||
630 | ifp = XFS_IFORK_PTR(cur->bc_private.b.ip, | |
631 | cur->bc_private.b.whichfork); | |
632 | ||
633 | return xfs_bmbt_maxrecs(cur->bc_mp, | |
634 | ifp->if_broot_bytes, level == 0) / 2; | |
635 | } | |
636 | ||
637 | return cur->bc_mp->m_bmap_dmnr[level != 0]; | |
91cca5df CH |
638 | } |
639 | ||
60197e8d | 640 | int |
ce5e42db CH |
641 | xfs_bmbt_get_maxrecs( |
642 | struct xfs_btree_cur *cur, | |
643 | int level) | |
644 | { | |
60197e8d CH |
645 | if (level == cur->bc_nlevels - 1) { |
646 | struct xfs_ifork *ifp; | |
647 | ||
648 | ifp = XFS_IFORK_PTR(cur->bc_private.b.ip, | |
649 | cur->bc_private.b.whichfork); | |
650 | ||
651 | return xfs_bmbt_maxrecs(cur->bc_mp, | |
652 | ifp->if_broot_bytes, level == 0); | |
653 | } | |
654 | ||
655 | return cur->bc_mp->m_bmap_dmxr[level != 0]; | |
656 | ||
ce5e42db CH |
657 | } |
658 | ||
4b22a571 CH |
659 | /* |
660 | * Get the maximum records we could store in the on-disk format. | |
661 | * | |
662 | * For non-root nodes this is equivalent to xfs_bmbt_get_maxrecs, but | |
663 | * for the root node this checks the available space in the dinode fork | |
664 | * so that we can resize the in-memory buffer to match it. After a | |
665 | * resize to the maximum size this function returns the same value | |
666 | * as xfs_bmbt_get_maxrecs for the root node, too. | |
667 | */ | |
668 | STATIC int | |
669 | xfs_bmbt_get_dmaxrecs( | |
670 | struct xfs_btree_cur *cur, | |
671 | int level) | |
672 | { | |
60197e8d CH |
673 | if (level != cur->bc_nlevels - 1) |
674 | return cur->bc_mp->m_bmap_dmxr[level != 0]; | |
152d93b7 | 675 | return xfs_bmdr_maxrecs(cur->bc_private.b.forksize, level == 0); |
4b22a571 CH |
676 | } |
677 | ||
fe033cc8 CH |
678 | STATIC void |
679 | xfs_bmbt_init_key_from_rec( | |
680 | union xfs_btree_key *key, | |
681 | union xfs_btree_rec *rec) | |
682 | { | |
683 | key->bmbt.br_startoff = | |
684 | cpu_to_be64(xfs_bmbt_disk_get_startoff(&rec->bmbt)); | |
685 | } | |
686 | ||
4b22a571 CH |
687 | STATIC void |
688 | xfs_bmbt_init_rec_from_key( | |
689 | union xfs_btree_key *key, | |
690 | union xfs_btree_rec *rec) | |
691 | { | |
692 | ASSERT(key->bmbt.br_startoff != 0); | |
693 | ||
694 | xfs_bmbt_disk_set_allf(&rec->bmbt, be64_to_cpu(key->bmbt.br_startoff), | |
695 | 0, 0, XFS_EXT_NORM); | |
696 | } | |
697 | ||
698 | STATIC void | |
699 | xfs_bmbt_init_rec_from_cur( | |
700 | struct xfs_btree_cur *cur, | |
701 | union xfs_btree_rec *rec) | |
702 | { | |
703 | xfs_bmbt_disk_set_all(&rec->bmbt, &cur->bc_rec.b); | |
704 | } | |
705 | ||
fe033cc8 CH |
706 | STATIC void |
707 | xfs_bmbt_init_ptr_from_cur( | |
708 | struct xfs_btree_cur *cur, | |
709 | union xfs_btree_ptr *ptr) | |
710 | { | |
711 | ptr->l = 0; | |
712 | } | |
713 | ||
714 | STATIC __int64_t | |
715 | xfs_bmbt_key_diff( | |
716 | struct xfs_btree_cur *cur, | |
717 | union xfs_btree_key *key) | |
718 | { | |
719 | return (__int64_t)be64_to_cpu(key->bmbt.br_startoff) - | |
720 | cur->bc_rec.b.br_startoff; | |
721 | } | |
722 | ||
c5c249b4 | 723 | static bool |
612cfbfe | 724 | xfs_bmbt_verify( |
3d3e6f64 DC |
725 | struct xfs_buf *bp) |
726 | { | |
727 | struct xfs_mount *mp = bp->b_target->bt_mount; | |
728 | struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp); | |
729 | unsigned int level; | |
3d3e6f64 | 730 | |
ee1a47ab CH |
731 | switch (block->bb_magic) { |
732 | case cpu_to_be32(XFS_BMAP_CRC_MAGIC): | |
733 | if (!xfs_sb_version_hascrc(&mp->m_sb)) | |
734 | return false; | |
735 | if (!uuid_equal(&block->bb_u.l.bb_uuid, &mp->m_sb.sb_uuid)) | |
736 | return false; | |
737 | if (be64_to_cpu(block->bb_u.l.bb_blkno) != bp->b_bn) | |
738 | return false; | |
739 | /* | |
740 | * XXX: need a better way of verifying the owner here. Right now | |
741 | * just make sure there has been one set. | |
742 | */ | |
743 | if (be64_to_cpu(block->bb_u.l.bb_owner) == 0) | |
744 | return false; | |
745 | /* fall through */ | |
746 | case cpu_to_be32(XFS_BMAP_MAGIC): | |
747 | break; | |
748 | default: | |
749 | return false; | |
750 | } | |
751 | ||
752 | /* | |
753 | * numrecs and level verification. | |
3d3e6f64 | 754 | * |
ee1a47ab | 755 | * We don't know what fork we belong to, so just verify that the level |
3d3e6f64 DC |
756 | * is less than the maximum of the two. Later checks will be more |
757 | * precise. | |
758 | */ | |
759 | level = be16_to_cpu(block->bb_level); | |
ee1a47ab CH |
760 | if (level > max(mp->m_bm_maxlevels[0], mp->m_bm_maxlevels[1])) |
761 | return false; | |
762 | if (be16_to_cpu(block->bb_numrecs) > mp->m_bmap_dmxr[level != 0]) | |
763 | return false; | |
3d3e6f64 DC |
764 | |
765 | /* sibling pointer verification */ | |
ee1a47ab CH |
766 | if (!block->bb_u.l.bb_leftsib || |
767 | (block->bb_u.l.bb_leftsib != cpu_to_be64(NULLDFSBNO) && | |
768 | !XFS_FSB_SANITY_CHECK(mp, be64_to_cpu(block->bb_u.l.bb_leftsib)))) | |
769 | return false; | |
770 | if (!block->bb_u.l.bb_rightsib || | |
771 | (block->bb_u.l.bb_rightsib != cpu_to_be64(NULLDFSBNO) && | |
772 | !XFS_FSB_SANITY_CHECK(mp, be64_to_cpu(block->bb_u.l.bb_rightsib)))) | |
773 | return false; | |
774 | ||
775 | return true; | |
612cfbfe | 776 | } |
3d3e6f64 | 777 | |
1813dd64 DC |
778 | static void |
779 | xfs_bmbt_read_verify( | |
612cfbfe DC |
780 | struct xfs_buf *bp) |
781 | { | |
ce5028cf ES |
782 | if (!xfs_btree_lblock_verify_crc(bp)) |
783 | xfs_buf_ioerror(bp, EFSBADCRC); | |
784 | else if (!xfs_bmbt_verify(bp)) | |
ee1a47ab | 785 | xfs_buf_ioerror(bp, EFSCORRUPTED); |
ce5028cf ES |
786 | |
787 | if (bp->b_error) { | |
788 | trace_xfs_btree_corrupt(bp, _RET_IP_); | |
789 | xfs_verifier_error(bp); | |
ee1a47ab | 790 | } |
612cfbfe DC |
791 | } |
792 | ||
1813dd64 DC |
793 | static void |
794 | xfs_bmbt_write_verify( | |
612cfbfe DC |
795 | struct xfs_buf *bp) |
796 | { | |
ee1a47ab | 797 | if (!xfs_bmbt_verify(bp)) { |
ee1a47ab | 798 | trace_xfs_btree_corrupt(bp, _RET_IP_); |
ee1a47ab | 799 | xfs_buf_ioerror(bp, EFSCORRUPTED); |
ce5028cf | 800 | xfs_verifier_error(bp); |
ee1a47ab CH |
801 | return; |
802 | } | |
803 | xfs_btree_lblock_calc_crc(bp); | |
3d3e6f64 DC |
804 | } |
805 | ||
1813dd64 DC |
806 | const struct xfs_buf_ops xfs_bmbt_buf_ops = { |
807 | .verify_read = xfs_bmbt_read_verify, | |
808 | .verify_write = xfs_bmbt_write_verify, | |
809 | }; | |
810 | ||
811 | ||
742ae1e3 | 812 | #if defined(DEBUG) || defined(XFS_WARN) |
4a26e66e CH |
813 | STATIC int |
814 | xfs_bmbt_keys_inorder( | |
815 | struct xfs_btree_cur *cur, | |
816 | union xfs_btree_key *k1, | |
817 | union xfs_btree_key *k2) | |
818 | { | |
819 | return be64_to_cpu(k1->bmbt.br_startoff) < | |
820 | be64_to_cpu(k2->bmbt.br_startoff); | |
821 | } | |
822 | ||
823 | STATIC int | |
824 | xfs_bmbt_recs_inorder( | |
825 | struct xfs_btree_cur *cur, | |
826 | union xfs_btree_rec *r1, | |
827 | union xfs_btree_rec *r2) | |
828 | { | |
829 | return xfs_bmbt_disk_get_startoff(&r1->bmbt) + | |
830 | xfs_bmbt_disk_get_blockcount(&r1->bmbt) <= | |
831 | xfs_bmbt_disk_get_startoff(&r2->bmbt); | |
832 | } | |
833 | #endif /* DEBUG */ | |
834 | ||
561f7d17 | 835 | static const struct xfs_btree_ops xfs_bmbt_ops = { |
65f1eaea CH |
836 | .rec_len = sizeof(xfs_bmbt_rec_t), |
837 | .key_len = sizeof(xfs_bmbt_key_t), | |
838 | ||
561f7d17 | 839 | .dup_cursor = xfs_bmbt_dup_cursor, |
4b22a571 | 840 | .update_cursor = xfs_bmbt_update_cursor, |
f5eb8e7c | 841 | .alloc_block = xfs_bmbt_alloc_block, |
d4b3a4b7 | 842 | .free_block = xfs_bmbt_free_block, |
ce5e42db | 843 | .get_maxrecs = xfs_bmbt_get_maxrecs, |
91cca5df | 844 | .get_minrecs = xfs_bmbt_get_minrecs, |
4b22a571 | 845 | .get_dmaxrecs = xfs_bmbt_get_dmaxrecs, |
fe033cc8 | 846 | .init_key_from_rec = xfs_bmbt_init_key_from_rec, |
4b22a571 CH |
847 | .init_rec_from_key = xfs_bmbt_init_rec_from_key, |
848 | .init_rec_from_cur = xfs_bmbt_init_rec_from_cur, | |
fe033cc8 CH |
849 | .init_ptr_from_cur = xfs_bmbt_init_ptr_from_cur, |
850 | .key_diff = xfs_bmbt_key_diff, | |
1813dd64 | 851 | .buf_ops = &xfs_bmbt_buf_ops, |
742ae1e3 | 852 | #if defined(DEBUG) || defined(XFS_WARN) |
4a26e66e CH |
853 | .keys_inorder = xfs_bmbt_keys_inorder, |
854 | .recs_inorder = xfs_bmbt_recs_inorder, | |
855 | #endif | |
561f7d17 CH |
856 | }; |
857 | ||
858 | /* | |
859 | * Allocate a new bmap btree cursor. | |
860 | */ | |
861 | struct xfs_btree_cur * /* new bmap btree cursor */ | |
862 | xfs_bmbt_init_cursor( | |
863 | struct xfs_mount *mp, /* file system mount point */ | |
864 | struct xfs_trans *tp, /* transaction pointer */ | |
865 | struct xfs_inode *ip, /* inode owning the btree */ | |
866 | int whichfork) /* data or attr fork */ | |
867 | { | |
868 | struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork); | |
869 | struct xfs_btree_cur *cur; | |
870 | ||
871 | cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_SLEEP); | |
872 | ||
873 | cur->bc_tp = tp; | |
874 | cur->bc_mp = mp; | |
875 | cur->bc_nlevels = be16_to_cpu(ifp->if_broot->bb_level) + 1; | |
876 | cur->bc_btnum = XFS_BTNUM_BMAP; | |
877 | cur->bc_blocklog = mp->m_sb.sb_blocklog; | |
878 | ||
879 | cur->bc_ops = &xfs_bmbt_ops; | |
e99ab90d | 880 | cur->bc_flags = XFS_BTREE_LONG_PTRS | XFS_BTREE_ROOT_IN_INODE; |
ee1a47ab CH |
881 | if (xfs_sb_version_hascrc(&mp->m_sb)) |
882 | cur->bc_flags |= XFS_BTREE_CRC_BLOCKS; | |
561f7d17 CH |
883 | |
884 | cur->bc_private.b.forksize = XFS_IFORK_SIZE(ip, whichfork); | |
885 | cur->bc_private.b.ip = ip; | |
886 | cur->bc_private.b.firstblock = NULLFSBLOCK; | |
887 | cur->bc_private.b.flist = NULL; | |
888 | cur->bc_private.b.allocated = 0; | |
889 | cur->bc_private.b.flags = 0; | |
890 | cur->bc_private.b.whichfork = whichfork; | |
891 | ||
892 | return cur; | |
893 | } | |
60197e8d CH |
894 | |
895 | /* | |
896 | * Calculate number of records in a bmap btree block. | |
897 | */ | |
898 | int | |
899 | xfs_bmbt_maxrecs( | |
900 | struct xfs_mount *mp, | |
901 | int blocklen, | |
902 | int leaf) | |
903 | { | |
7cc95a82 | 904 | blocklen -= XFS_BMBT_BLOCK_LEN(mp); |
60197e8d CH |
905 | |
906 | if (leaf) | |
907 | return blocklen / sizeof(xfs_bmbt_rec_t); | |
908 | return blocklen / (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t)); | |
909 | } | |
910 | ||
911 | /* | |
912 | * Calculate number of records in a bmap btree inode root. | |
913 | */ | |
914 | int | |
915 | xfs_bmdr_maxrecs( | |
60197e8d CH |
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 | } | |
21b5c978 DC |
925 | |
926 | /* | |
927 | * Change the owner of a btree format fork fo the inode passed in. Change it to | |
928 | * the owner of that is passed in so that we can change owners before or after | |
929 | * we switch forks between inodes. The operation that the caller is doing will | |
930 | * determine whether is needs to change owner before or after the switch. | |
931 | * | |
638f4416 DC |
932 | * For demand paged transactional modification, the fork switch should be done |
933 | * after reading in all the blocks, modifying them and pinning them in the | |
934 | * transaction. For modification when the buffers are already pinned in memory, | |
935 | * the fork switch can be done before changing the owner as we won't need to | |
936 | * validate the owner until the btree buffers are unpinned and writes can occur | |
937 | * again. | |
938 | * | |
939 | * For recovery based ownership change, there is no transactional context and | |
940 | * so a buffer list must be supplied so that we can record the buffers that we | |
941 | * modified for the caller to issue IO on. | |
21b5c978 DC |
942 | */ |
943 | int | |
944 | xfs_bmbt_change_owner( | |
945 | struct xfs_trans *tp, | |
946 | struct xfs_inode *ip, | |
947 | int whichfork, | |
638f4416 DC |
948 | xfs_ino_t new_owner, |
949 | struct list_head *buffer_list) | |
21b5c978 DC |
950 | { |
951 | struct xfs_btree_cur *cur; | |
952 | int error; | |
953 | ||
638f4416 DC |
954 | ASSERT(tp || buffer_list); |
955 | ASSERT(!(tp && buffer_list)); | |
21b5c978 | 956 | if (whichfork == XFS_DATA_FORK) |
aa9e1040 | 957 | ASSERT(ip->i_d.di_format == XFS_DINODE_FMT_BTREE); |
21b5c978 | 958 | else |
aa9e1040 | 959 | ASSERT(ip->i_d.di_aformat == XFS_DINODE_FMT_BTREE); |
21b5c978 DC |
960 | |
961 | cur = xfs_bmbt_init_cursor(ip->i_mount, tp, ip, whichfork); | |
638f4416 DC |
962 | if (!cur) |
963 | return ENOMEM; | |
964 | ||
965 | error = xfs_btree_change_owner(cur, new_owner, buffer_list); | |
21b5c978 DC |
966 | xfs_btree_del_cursor(cur, error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR); |
967 | return error; | |
968 | } |