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Linux 3.12.5
[linux/fpc-iii.git] / fs / xfs / xfs_bmap_btree.c
blobbb8de8e399c4b351effa08e6669e000438751d37
1 /*
2 * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
3 * All Rights Reserved.
4 *
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
7 * published by the Free Software Foundation.
8 *
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.
13 *
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
17 */
18 #include "xfs.h"
19 #include "xfs_fs.h"
20 #include "xfs_format.h"
21 #include "xfs_bit.h"
22 #include "xfs_log.h"
23 #include "xfs_trans.h"
24 #include "xfs_sb.h"
25 #include "xfs_ag.h"
26 #include "xfs_mount.h"
27 #include "xfs_bmap_btree.h"
28 #include "xfs_alloc_btree.h"
29 #include "xfs_ialloc_btree.h"
30 #include "xfs_dinode.h"
31 #include "xfs_inode.h"
32 #include "xfs_inode_item.h"
33 #include "xfs_alloc.h"
34 #include "xfs_btree.h"
35 #include "xfs_itable.h"
36 #include "xfs_bmap.h"
37 #include "xfs_error.h"
38 #include "xfs_quota.h"
39 #include "xfs_trace.h"
40 #include "xfs_cksum.h"
41
42 /*
43 * Determine the extent state.
44 */
45 /* ARGSUSED */
46 STATIC xfs_exntst_t
47 xfs_extent_state(
48 xfs_filblks_t blks,
49 int extent_flag)
50 {
51 if (extent_flag) {
52 ASSERT(blks != 0); /* saved for DMIG */
53 return XFS_EXT_UNWRITTEN;
54 }
55 return XFS_EXT_NORM;
56 }
57
58 /*
59 * Convert on-disk form of btree root to in-memory form.
60 */
61 void
62 xfs_bmdr_to_bmbt(
63 struct xfs_inode *ip,
64 xfs_bmdr_block_t *dblock,
65 int dblocklen,
66 struct xfs_btree_block *rblock,
67 int rblocklen)
68 {
69 struct xfs_mount *mp = ip->i_mount;
70 int dmxr;
71 xfs_bmbt_key_t *fkp;
72 __be64 *fpp;
73 xfs_bmbt_key_t *tkp;
74 __be64 *tpp;
75
76 if (xfs_sb_version_hascrc(&mp->m_sb))
77 xfs_btree_init_block_int(mp, rblock, XFS_BUF_DADDR_NULL,
78 XFS_BMAP_CRC_MAGIC, 0, 0, ip->i_ino,
79 XFS_BTREE_LONG_PTRS | XFS_BTREE_CRC_BLOCKS);
80 else
81 xfs_btree_init_block_int(mp, rblock, XFS_BUF_DADDR_NULL,
82 XFS_BMAP_MAGIC, 0, 0, ip->i_ino,
83 XFS_BTREE_LONG_PTRS);
84
85 rblock->bb_level = dblock->bb_level;
86 ASSERT(be16_to_cpu(rblock->bb_level) > 0);
87 rblock->bb_numrecs = dblock->bb_numrecs;
88 dmxr = xfs_bmdr_maxrecs(mp, dblocklen, 0);
89 fkp = XFS_BMDR_KEY_ADDR(dblock, 1);
90 tkp = XFS_BMBT_KEY_ADDR(mp, rblock, 1);
91 fpp = XFS_BMDR_PTR_ADDR(dblock, 1, dmxr);
92 tpp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, rblocklen);
93 dmxr = be16_to_cpu(dblock->bb_numrecs);
94 memcpy(tkp, fkp, sizeof(*fkp) * dmxr);
95 memcpy(tpp, fpp, sizeof(*fpp) * dmxr);
96 }
97
98 /*
99 * Convert a compressed bmap extent record to an uncompressed form.
100 * This code must be in sync with the routines xfs_bmbt_get_startoff,
101 * xfs_bmbt_get_startblock, xfs_bmbt_get_blockcount and xfs_bmbt_get_state.
102 */
103 STATIC void
104 __xfs_bmbt_get_all(
105 __uint64_t l0,
106 __uint64_t l1,
107 xfs_bmbt_irec_t *s)
108 {
109 int ext_flag;
110 xfs_exntst_t st;
111
112 ext_flag = (int)(l0 >> (64 - BMBT_EXNTFLAG_BITLEN));
113 s->br_startoff = ((xfs_fileoff_t)l0 &
114 xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
115 #if XFS_BIG_BLKNOS
116 s->br_startblock = (((xfs_fsblock_t)l0 & xfs_mask64lo(9)) << 43) |
117 (((xfs_fsblock_t)l1) >> 21);
118 #else
119 #ifdef DEBUG
120 {
121 xfs_dfsbno_t b;
122
123 b = (((xfs_dfsbno_t)l0 & xfs_mask64lo(9)) << 43) |
124 (((xfs_dfsbno_t)l1) >> 21);
125 ASSERT((b >> 32) == 0 || isnulldstartblock(b));
126 s->br_startblock = (xfs_fsblock_t)b;
127 }
128 #else /* !DEBUG */
129 s->br_startblock = (xfs_fsblock_t)(((xfs_dfsbno_t)l1) >> 21);
130 #endif /* DEBUG */
131 #endif /* XFS_BIG_BLKNOS */
132 s->br_blockcount = (xfs_filblks_t)(l1 & xfs_mask64lo(21));
133 /* This is xfs_extent_state() in-line */
134 if (ext_flag) {
135 ASSERT(s->br_blockcount != 0); /* saved for DMIG */
136 st = XFS_EXT_UNWRITTEN;
137 } else
138 st = XFS_EXT_NORM;
139 s->br_state = st;
140 }
141
142 void
143 xfs_bmbt_get_all(
144 xfs_bmbt_rec_host_t *r,
145 xfs_bmbt_irec_t *s)
146 {
147 __xfs_bmbt_get_all(r->l0, r->l1, s);
148 }
149
150 /*
151 * Extract the blockcount field from an in memory bmap extent record.
152 */
153 xfs_filblks_t
154 xfs_bmbt_get_blockcount(
155 xfs_bmbt_rec_host_t *r)
156 {
157 return (xfs_filblks_t)(r->l1 & xfs_mask64lo(21));
158 }
159
160 /*
161 * Extract the startblock field from an in memory bmap extent record.
162 */
163 xfs_fsblock_t
164 xfs_bmbt_get_startblock(
165 xfs_bmbt_rec_host_t *r)
166 {
167 #if XFS_BIG_BLKNOS
168 return (((xfs_fsblock_t)r->l0 & xfs_mask64lo(9)) << 43) |
169 (((xfs_fsblock_t)r->l1) >> 21);
170 #else
171 #ifdef DEBUG
172 xfs_dfsbno_t b;
173
174 b = (((xfs_dfsbno_t)r->l0 & xfs_mask64lo(9)) << 43) |
175 (((xfs_dfsbno_t)r->l1) >> 21);
176 ASSERT((b >> 32) == 0 || isnulldstartblock(b));
177 return (xfs_fsblock_t)b;
178 #else /* !DEBUG */
179 return (xfs_fsblock_t)(((xfs_dfsbno_t)r->l1) >> 21);
180 #endif /* DEBUG */
181 #endif /* XFS_BIG_BLKNOS */
182 }
183
184 /*
185 * Extract the startoff field from an in memory bmap extent record.
186 */
187 xfs_fileoff_t
188 xfs_bmbt_get_startoff(
189 xfs_bmbt_rec_host_t *r)
190 {
191 return ((xfs_fileoff_t)r->l0 &
192 xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
193 }
194
195 xfs_exntst_t
196 xfs_bmbt_get_state(
197 xfs_bmbt_rec_host_t *r)
198 {
199 int ext_flag;
200
201 ext_flag = (int)((r->l0) >> (64 - BMBT_EXNTFLAG_BITLEN));
202 return xfs_extent_state(xfs_bmbt_get_blockcount(r),
203 ext_flag);
204 }
205
206 /*
207 * Extract the blockcount field from an on disk bmap extent record.
208 */
209 xfs_filblks_t
210 xfs_bmbt_disk_get_blockcount(
211 xfs_bmbt_rec_t *r)
212 {
213 return (xfs_filblks_t)(be64_to_cpu(r->l1) & xfs_mask64lo(21));
214 }
215
216 /*
217 * Extract the startoff field from a disk format bmap extent record.
218 */
219 xfs_fileoff_t
220 xfs_bmbt_disk_get_startoff(
221 xfs_bmbt_rec_t *r)
222 {
223 return ((xfs_fileoff_t)be64_to_cpu(r->l0) &
224 xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
225 }
226
227
228 /*
229 * Set all the fields in a bmap extent record from the arguments.
230 */
231 void
232 xfs_bmbt_set_allf(
233 xfs_bmbt_rec_host_t *r,
234 xfs_fileoff_t startoff,
235 xfs_fsblock_t startblock,
236 xfs_filblks_t blockcount,
237 xfs_exntst_t state)
238 {
239 int extent_flag = (state == XFS_EXT_NORM) ? 0 : 1;
240
241 ASSERT(state == XFS_EXT_NORM || state == XFS_EXT_UNWRITTEN);
242 ASSERT((startoff & xfs_mask64hi(64-BMBT_STARTOFF_BITLEN)) == 0);
243 ASSERT((blockcount & xfs_mask64hi(64-BMBT_BLOCKCOUNT_BITLEN)) == 0);
244
245 #if XFS_BIG_BLKNOS
246 ASSERT((startblock & xfs_mask64hi(64-BMBT_STARTBLOCK_BITLEN)) == 0);
247
248 r->l0 = ((xfs_bmbt_rec_base_t)extent_flag << 63) |
249 ((xfs_bmbt_rec_base_t)startoff << 9) |
250 ((xfs_bmbt_rec_base_t)startblock >> 43);
251 r->l1 = ((xfs_bmbt_rec_base_t)startblock << 21) |
252 ((xfs_bmbt_rec_base_t)blockcount &
253 (xfs_bmbt_rec_base_t)xfs_mask64lo(21));
254 #else /* !XFS_BIG_BLKNOS */
255 if (isnullstartblock(startblock)) {
256 r->l0 = ((xfs_bmbt_rec_base_t)extent_flag << 63) |
257 ((xfs_bmbt_rec_base_t)startoff << 9) |
258 (xfs_bmbt_rec_base_t)xfs_mask64lo(9);
259 r->l1 = xfs_mask64hi(11) |
260 ((xfs_bmbt_rec_base_t)startblock << 21) |
261 ((xfs_bmbt_rec_base_t)blockcount &
262 (xfs_bmbt_rec_base_t)xfs_mask64lo(21));
263 } else {
264 r->l0 = ((xfs_bmbt_rec_base_t)extent_flag << 63) |
265 ((xfs_bmbt_rec_base_t)startoff << 9);
266 r->l1 = ((xfs_bmbt_rec_base_t)startblock << 21) |
267 ((xfs_bmbt_rec_base_t)blockcount &
268 (xfs_bmbt_rec_base_t)xfs_mask64lo(21));
269 }
270 #endif /* XFS_BIG_BLKNOS */
271 }
272
273 /*
274 * Set all the fields in a bmap extent record from the uncompressed form.
275 */
276 void
277 xfs_bmbt_set_all(
278 xfs_bmbt_rec_host_t *r,
279 xfs_bmbt_irec_t *s)
280 {
281 xfs_bmbt_set_allf(r, s->br_startoff, s->br_startblock,
282 s->br_blockcount, s->br_state);
283 }
284
285
286 /*
287 * Set all the fields in a disk format bmap extent record from the arguments.
288 */
289 void
290 xfs_bmbt_disk_set_allf(
291 xfs_bmbt_rec_t *r,
292 xfs_fileoff_t startoff,
293 xfs_fsblock_t startblock,
294 xfs_filblks_t blockcount,
295 xfs_exntst_t state)
296 {
297 int extent_flag = (state == XFS_EXT_NORM) ? 0 : 1;
298
299 ASSERT(state == XFS_EXT_NORM || state == XFS_EXT_UNWRITTEN);
300 ASSERT((startoff & xfs_mask64hi(64-BMBT_STARTOFF_BITLEN)) == 0);
301 ASSERT((blockcount & xfs_mask64hi(64-BMBT_BLOCKCOUNT_BITLEN)) == 0);
302
303 #if XFS_BIG_BLKNOS
304 ASSERT((startblock & xfs_mask64hi(64-BMBT_STARTBLOCK_BITLEN)) == 0);
305
306 r->l0 = cpu_to_be64(
307 ((xfs_bmbt_rec_base_t)extent_flag << 63) |
308 ((xfs_bmbt_rec_base_t)startoff << 9) |
309 ((xfs_bmbt_rec_base_t)startblock >> 43));
310 r->l1 = cpu_to_be64(
311 ((xfs_bmbt_rec_base_t)startblock << 21) |
312 ((xfs_bmbt_rec_base_t)blockcount &
313 (xfs_bmbt_rec_base_t)xfs_mask64lo(21)));
314 #else /* !XFS_BIG_BLKNOS */
315 if (isnullstartblock(startblock)) {
316 r->l0 = cpu_to_be64(
317 ((xfs_bmbt_rec_base_t)extent_flag << 63) |
318 ((xfs_bmbt_rec_base_t)startoff << 9) |
319 (xfs_bmbt_rec_base_t)xfs_mask64lo(9));
320 r->l1 = cpu_to_be64(xfs_mask64hi(11) |
321 ((xfs_bmbt_rec_base_t)startblock << 21) |
322 ((xfs_bmbt_rec_base_t)blockcount &
323 (xfs_bmbt_rec_base_t)xfs_mask64lo(21)));
324 } else {
325 r->l0 = cpu_to_be64(
326 ((xfs_bmbt_rec_base_t)extent_flag << 63) |
327 ((xfs_bmbt_rec_base_t)startoff << 9));
328 r->l1 = cpu_to_be64(
329 ((xfs_bmbt_rec_base_t)startblock << 21) |
330 ((xfs_bmbt_rec_base_t)blockcount &
331 (xfs_bmbt_rec_base_t)xfs_mask64lo(21)));
332 }
333 #endif /* XFS_BIG_BLKNOS */
334 }
335
336 /*
337 * Set all the fields in a bmap extent record from the uncompressed form.
338 */
339 STATIC void
340 xfs_bmbt_disk_set_all(
341 xfs_bmbt_rec_t *r,
342 xfs_bmbt_irec_t *s)
343 {
344 xfs_bmbt_disk_set_allf(r, s->br_startoff, s->br_startblock,
345 s->br_blockcount, s->br_state);
346 }
347
348 /*
349 * Set the blockcount field in a bmap extent record.
350 */
351 void
352 xfs_bmbt_set_blockcount(
353 xfs_bmbt_rec_host_t *r,
354 xfs_filblks_t v)
355 {
356 ASSERT((v & xfs_mask64hi(43)) == 0);
357 r->l1 = (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64hi(43)) |
358 (xfs_bmbt_rec_base_t)(v & xfs_mask64lo(21));
359 }
360
361 /*
362 * Set the startblock field in a bmap extent record.
363 */
364 void
365 xfs_bmbt_set_startblock(
366 xfs_bmbt_rec_host_t *r,
367 xfs_fsblock_t v)
368 {
369 #if XFS_BIG_BLKNOS
370 ASSERT((v & xfs_mask64hi(12)) == 0);
371 r->l0 = (r->l0 & (xfs_bmbt_rec_base_t)xfs_mask64hi(55)) |
372 (xfs_bmbt_rec_base_t)(v >> 43);
373 r->l1 = (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64lo(21)) |
374 (xfs_bmbt_rec_base_t)(v << 21);
375 #else /* !XFS_BIG_BLKNOS */
376 if (isnullstartblock(v)) {
377 r->l0 |= (xfs_bmbt_rec_base_t)xfs_mask64lo(9);
378 r->l1 = (xfs_bmbt_rec_base_t)xfs_mask64hi(11) |
379 ((xfs_bmbt_rec_base_t)v << 21) |
380 (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64lo(21));
381 } else {
382 r->l0 &= ~(xfs_bmbt_rec_base_t)xfs_mask64lo(9);
383 r->l1 = ((xfs_bmbt_rec_base_t)v << 21) |
384 (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64lo(21));
385 }
386 #endif /* XFS_BIG_BLKNOS */
387 }
388
389 /*
390 * Set the startoff field in a bmap extent record.
391 */
392 void
393 xfs_bmbt_set_startoff(
394 xfs_bmbt_rec_host_t *r,
395 xfs_fileoff_t v)
396 {
397 ASSERT((v & xfs_mask64hi(9)) == 0);
398 r->l0 = (r->l0 & (xfs_bmbt_rec_base_t) xfs_mask64hi(1)) |
399 ((xfs_bmbt_rec_base_t)v << 9) |
400 (r->l0 & (xfs_bmbt_rec_base_t)xfs_mask64lo(9));
401 }
402
403 /*
404 * Set the extent state field in a bmap extent record.
405 */
406 void
407 xfs_bmbt_set_state(
408 xfs_bmbt_rec_host_t *r,
409 xfs_exntst_t v)
410 {
411 ASSERT(v == XFS_EXT_NORM || v == XFS_EXT_UNWRITTEN);
412 if (v == XFS_EXT_NORM)
413 r->l0 &= xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN);
414 else
415 r->l0 |= xfs_mask64hi(BMBT_EXNTFLAG_BITLEN);
416 }
417
418 /*
419 * Convert in-memory form of btree root to on-disk form.
420 */
421 void
422 xfs_bmbt_to_bmdr(
423 struct xfs_mount *mp,
424 struct xfs_btree_block *rblock,
425 int rblocklen,
426 xfs_bmdr_block_t *dblock,
427 int dblocklen)
428 {
429 int dmxr;
430 xfs_bmbt_key_t *fkp;
431 __be64 *fpp;
432 xfs_bmbt_key_t *tkp;
433 __be64 *tpp;
434
435 if (xfs_sb_version_hascrc(&mp->m_sb)) {
436 ASSERT(rblock->bb_magic == cpu_to_be32(XFS_BMAP_CRC_MAGIC));
437 ASSERT(uuid_equal(&rblock->bb_u.l.bb_uuid, &mp->m_sb.sb_uuid));
438 ASSERT(rblock->bb_u.l.bb_blkno ==
439 cpu_to_be64(XFS_BUF_DADDR_NULL));
440 } else
441 ASSERT(rblock->bb_magic == cpu_to_be32(XFS_BMAP_MAGIC));
442 ASSERT(rblock->bb_u.l.bb_leftsib == cpu_to_be64(NULLDFSBNO));
443 ASSERT(rblock->bb_u.l.bb_rightsib == cpu_to_be64(NULLDFSBNO));
444 ASSERT(rblock->bb_level != 0);
445 dblock->bb_level = rblock->bb_level;
446 dblock->bb_numrecs = rblock->bb_numrecs;
447 dmxr = xfs_bmdr_maxrecs(mp, dblocklen, 0);
448 fkp = XFS_BMBT_KEY_ADDR(mp, rblock, 1);
449 tkp = XFS_BMDR_KEY_ADDR(dblock, 1);
450 fpp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, rblocklen);
451 tpp = XFS_BMDR_PTR_ADDR(dblock, 1, dmxr);
452 dmxr = be16_to_cpu(dblock->bb_numrecs);
453 memcpy(tkp, fkp, sizeof(*fkp) * dmxr);
454 memcpy(tpp, fpp, sizeof(*fpp) * dmxr);
455 }
456
457 /*
458 * Check extent records, which have just been read, for
459 * any bit in the extent flag field. ASSERT on debug
460 * kernels, as this condition should not occur.
461 * Return an error condition (1) if any flags found,
462 * otherwise return 0.
463 */
464
465 int
466 xfs_check_nostate_extents(
467 xfs_ifork_t *ifp,
468 xfs_extnum_t idx,
469 xfs_extnum_t num)
470 {
471 for (; num > 0; num--, idx++) {
472 xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, idx);
473 if ((ep->l0 >>
474 (64 - BMBT_EXNTFLAG_BITLEN)) != 0) {
475 ASSERT(0);
476 return 1;
477 }
478 }
479 return 0;
480 }
481
482
483 STATIC struct xfs_btree_cur *
484 xfs_bmbt_dup_cursor(
485 struct xfs_btree_cur *cur)
486 {
487 struct xfs_btree_cur *new;
488
489 new = xfs_bmbt_init_cursor(cur->bc_mp, cur->bc_tp,
490 cur->bc_private.b.ip, cur->bc_private.b.whichfork);
491
492 /*
493 * Copy the firstblock, flist, and flags values,
494 * since init cursor doesn't get them.
495 */
496 new->bc_private.b.firstblock = cur->bc_private.b.firstblock;
497 new->bc_private.b.flist = cur->bc_private.b.flist;
498 new->bc_private.b.flags = cur->bc_private.b.flags;
499
500 return new;
501 }
502
503 STATIC void
504 xfs_bmbt_update_cursor(
505 struct xfs_btree_cur *src,
506 struct xfs_btree_cur *dst)
507 {
508 ASSERT((dst->bc_private.b.firstblock != NULLFSBLOCK) ||
509 (dst->bc_private.b.ip->i_d.di_flags & XFS_DIFLAG_REALTIME));
510 ASSERT(dst->bc_private.b.flist == src->bc_private.b.flist);
511
512 dst->bc_private.b.allocated += src->bc_private.b.allocated;
513 dst->bc_private.b.firstblock = src->bc_private.b.firstblock;
514
515 src->bc_private.b.allocated = 0;
516 }
517
518 STATIC int
519 xfs_bmbt_alloc_block(
520 struct xfs_btree_cur *cur,
521 union xfs_btree_ptr *start,
522 union xfs_btree_ptr *new,
523 int length,
524 int *stat)
525 {
526 xfs_alloc_arg_t args; /* block allocation args */
527 int error; /* error return value */
528
529 memset(&args, 0, sizeof(args));
530 args.tp = cur->bc_tp;
531 args.mp = cur->bc_mp;
532 args.fsbno = cur->bc_private.b.firstblock;
533 args.firstblock = args.fsbno;
534
535 if (args.fsbno == NULLFSBLOCK) {
536 args.fsbno = be64_to_cpu(start->l);
537 args.type = XFS_ALLOCTYPE_START_BNO;
538 /*
539 * Make sure there is sufficient room left in the AG to
540 * complete a full tree split for an extent insert. If
541 * we are converting the middle part of an extent then
542 * we may need space for two tree splits.
543 *
544 * We are relying on the caller to make the correct block
545 * reservation for this operation to succeed. If the
546 * reservation amount is insufficient then we may fail a
547 * block allocation here and corrupt the filesystem.
548 */
549 args.minleft = xfs_trans_get_block_res(args.tp);
550 } else if (cur->bc_private.b.flist->xbf_low) {
551 args.type = XFS_ALLOCTYPE_START_BNO;
552 } else {
553 args.type = XFS_ALLOCTYPE_NEAR_BNO;
554 }
555
556 args.minlen = args.maxlen = args.prod = 1;
557 args.wasdel = cur->bc_private.b.flags & XFS_BTCUR_BPRV_WASDEL;
558 if (!args.wasdel && xfs_trans_get_block_res(args.tp) == 0) {
559 error = XFS_ERROR(ENOSPC);
560 goto error0;
561 }
562 error = xfs_alloc_vextent(&args);
563 if (error)
564 goto error0;
565
566 if (args.fsbno == NULLFSBLOCK && args.minleft) {
567 /*
568 * Could not find an AG with enough free space to satisfy
569 * a full btree split. Try again without minleft and if
570 * successful activate the lowspace algorithm.
571 */
572 args.fsbno = 0;
573 args.type = XFS_ALLOCTYPE_FIRST_AG;
574 args.minleft = 0;
575 error = xfs_alloc_vextent(&args);
576 if (error)
577 goto error0;
578 cur->bc_private.b.flist->xbf_low = 1;
579 }
580 if (args.fsbno == NULLFSBLOCK) {
581 XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
582 *stat = 0;
583 return 0;
584 }
585 ASSERT(args.len == 1);
586 cur->bc_private.b.firstblock = args.fsbno;
587 cur->bc_private.b.allocated++;
588 cur->bc_private.b.ip->i_d.di_nblocks++;
589 xfs_trans_log_inode(args.tp, cur->bc_private.b.ip, XFS_ILOG_CORE);
590 xfs_trans_mod_dquot_byino(args.tp, cur->bc_private.b.ip,
591 XFS_TRANS_DQ_BCOUNT, 1L);
592
593 new->l = cpu_to_be64(args.fsbno);
594
595 XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
596 *stat = 1;
597 return 0;
598
599 error0:
600 XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
601 return error;
602 }
603
604 STATIC int
605 xfs_bmbt_free_block(
606 struct xfs_btree_cur *cur,
607 struct xfs_buf *bp)
608 {
609 struct xfs_mount *mp = cur->bc_mp;
610 struct xfs_inode *ip = cur->bc_private.b.ip;
611 struct xfs_trans *tp = cur->bc_tp;
612 xfs_fsblock_t fsbno = XFS_DADDR_TO_FSB(mp, XFS_BUF_ADDR(bp));
613
614 xfs_bmap_add_free(fsbno, 1, cur->bc_private.b.flist, mp);
615 ip->i_d.di_nblocks--;
616
617 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
618 xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
619 xfs_trans_binval(tp, bp);
620 return 0;
621 }
622
623 STATIC int
624 xfs_bmbt_get_minrecs(
625 struct xfs_btree_cur *cur,
626 int level)
627 {
628 if (level == cur->bc_nlevels - 1) {
629 struct xfs_ifork *ifp;
630
631 ifp = XFS_IFORK_PTR(cur->bc_private.b.ip,
632 cur->bc_private.b.whichfork);
633
634 return xfs_bmbt_maxrecs(cur->bc_mp,
635 ifp->if_broot_bytes, level == 0) / 2;
636 }
637
638 return cur->bc_mp->m_bmap_dmnr[level != 0];
639 }
640
641 int
642 xfs_bmbt_get_maxrecs(
643 struct xfs_btree_cur *cur,
644 int level)
645 {
646 if (level == cur->bc_nlevels - 1) {
647 struct xfs_ifork *ifp;
648
649 ifp = XFS_IFORK_PTR(cur->bc_private.b.ip,
650 cur->bc_private.b.whichfork);
651
652 return xfs_bmbt_maxrecs(cur->bc_mp,
653 ifp->if_broot_bytes, level == 0);
654 }
655
656 return cur->bc_mp->m_bmap_dmxr[level != 0];
657
658 }
659
660 /*
661 * Get the maximum records we could store in the on-disk format.
662 *
663 * For non-root nodes this is equivalent to xfs_bmbt_get_maxrecs, but
664 * for the root node this checks the available space in the dinode fork
665 * so that we can resize the in-memory buffer to match it. After a
666 * resize to the maximum size this function returns the same value
667 * as xfs_bmbt_get_maxrecs for the root node, too.
668 */
669 STATIC int
670 xfs_bmbt_get_dmaxrecs(
671 struct xfs_btree_cur *cur,
672 int level)
673 {
674 if (level != cur->bc_nlevels - 1)
675 return cur->bc_mp->m_bmap_dmxr[level != 0];
676 return xfs_bmdr_maxrecs(cur->bc_mp, cur->bc_private.b.forksize,
677 level == 0);
678 }
679
680 STATIC void
681 xfs_bmbt_init_key_from_rec(
682 union xfs_btree_key *key,
683 union xfs_btree_rec *rec)
684 {
685 key->bmbt.br_startoff =
686 cpu_to_be64(xfs_bmbt_disk_get_startoff(&rec->bmbt));
687 }
688
689 STATIC void
690 xfs_bmbt_init_rec_from_key(
691 union xfs_btree_key *key,
692 union xfs_btree_rec *rec)
693 {
694 ASSERT(key->bmbt.br_startoff != 0);
695
696 xfs_bmbt_disk_set_allf(&rec->bmbt, be64_to_cpu(key->bmbt.br_startoff),
697 0, 0, XFS_EXT_NORM);
698 }
699
700 STATIC void
701 xfs_bmbt_init_rec_from_cur(
702 struct xfs_btree_cur *cur,
703 union xfs_btree_rec *rec)
704 {
705 xfs_bmbt_disk_set_all(&rec->bmbt, &cur->bc_rec.b);
706 }
707
708 STATIC void
709 xfs_bmbt_init_ptr_from_cur(
710 struct xfs_btree_cur *cur,
711 union xfs_btree_ptr *ptr)
712 {
713 ptr->l = 0;
714 }
715
716 STATIC __int64_t
717 xfs_bmbt_key_diff(
718 struct xfs_btree_cur *cur,
719 union xfs_btree_key *key)
720 {
721 return (__int64_t)be64_to_cpu(key->bmbt.br_startoff) -
722 cur->bc_rec.b.br_startoff;
723 }
724
725 static bool
726 xfs_bmbt_verify(
727 struct xfs_buf *bp)
728 {
729 struct xfs_mount *mp = bp->b_target->bt_mount;
730 struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp);
731 unsigned int level;
732
733 switch (block->bb_magic) {
734 case cpu_to_be32(XFS_BMAP_CRC_MAGIC):
735 if (!xfs_sb_version_hascrc(&mp->m_sb))
736 return false;
737 if (!uuid_equal(&block->bb_u.l.bb_uuid, &mp->m_sb.sb_uuid))
738 return false;
739 if (be64_to_cpu(block->bb_u.l.bb_blkno) != bp->b_bn)
740 return false;
741 /*
742 * XXX: need a better way of verifying the owner here. Right now
743 * just make sure there has been one set.
744 */
745 if (be64_to_cpu(block->bb_u.l.bb_owner) == 0)
746 return false;
747 /* fall through */
748 case cpu_to_be32(XFS_BMAP_MAGIC):
749 break;
750 default:
751 return false;
752 }
753
754 /*
755 * numrecs and level verification.
756 *
757 * We don't know what fork we belong to, so just verify that the level
758 * is less than the maximum of the two. Later checks will be more
759 * precise.
760 */
761 level = be16_to_cpu(block->bb_level);
762 if (level > max(mp->m_bm_maxlevels[0], mp->m_bm_maxlevels[1]))
763 return false;
764 if (be16_to_cpu(block->bb_numrecs) > mp->m_bmap_dmxr[level != 0])
765 return false;
766
767 /* sibling pointer verification */
768 if (!block->bb_u.l.bb_leftsib ||
769 (block->bb_u.l.bb_leftsib != cpu_to_be64(NULLDFSBNO) &&
770 !XFS_FSB_SANITY_CHECK(mp, be64_to_cpu(block->bb_u.l.bb_leftsib))))
771 return false;
772 if (!block->bb_u.l.bb_rightsib ||
773 (block->bb_u.l.bb_rightsib != cpu_to_be64(NULLDFSBNO) &&
774 !XFS_FSB_SANITY_CHECK(mp, be64_to_cpu(block->bb_u.l.bb_rightsib))))
775 return false;
776
777 return true;
778 }
779
780 static void
781 xfs_bmbt_read_verify(
782 struct xfs_buf *bp)
783 {
784 if (!(xfs_btree_lblock_verify_crc(bp) &&
785 xfs_bmbt_verify(bp))) {
786 trace_xfs_btree_corrupt(bp, _RET_IP_);
787 XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW,
788 bp->b_target->bt_mount, bp->b_addr);
789 xfs_buf_ioerror(bp, EFSCORRUPTED);
790 }
791 }
792
793 static void
794 xfs_bmbt_write_verify(
795 struct xfs_buf *bp)
796 {
797 if (!xfs_bmbt_verify(bp)) {
798 xfs_warn(bp->b_target->bt_mount, "bmbt daddr 0x%llx failed", bp->b_bn);
799 trace_xfs_btree_corrupt(bp, _RET_IP_);
800 XFS_CORRUPTION_ERROR(__func__, XFS_ERRLEVEL_LOW,
801 bp->b_target->bt_mount, bp->b_addr);
802 xfs_buf_ioerror(bp, EFSCORRUPTED);
803 return;
804 }
805 xfs_btree_lblock_calc_crc(bp);
806 }
807
808 const struct xfs_buf_ops xfs_bmbt_buf_ops = {
809 .verify_read = xfs_bmbt_read_verify,
810 .verify_write = xfs_bmbt_write_verify,
811 };
812
813
814 #if defined(DEBUG) || defined(XFS_WARN)
815 STATIC int
816 xfs_bmbt_keys_inorder(
817 struct xfs_btree_cur *cur,
818 union xfs_btree_key *k1,
819 union xfs_btree_key *k2)
820 {
821 return be64_to_cpu(k1->bmbt.br_startoff) <
822 be64_to_cpu(k2->bmbt.br_startoff);
823 }
824
825 STATIC int
826 xfs_bmbt_recs_inorder(
827 struct xfs_btree_cur *cur,
828 union xfs_btree_rec *r1,
829 union xfs_btree_rec *r2)
830 {
831 return xfs_bmbt_disk_get_startoff(&r1->bmbt) +
832 xfs_bmbt_disk_get_blockcount(&r1->bmbt) <=
833 xfs_bmbt_disk_get_startoff(&r2->bmbt);
834 }
835 #endif /* DEBUG */
836
837 static const struct xfs_btree_ops xfs_bmbt_ops = {
838 .rec_len = sizeof(xfs_bmbt_rec_t),
839 .key_len = sizeof(xfs_bmbt_key_t),
840
841 .dup_cursor = xfs_bmbt_dup_cursor,
842 .update_cursor = xfs_bmbt_update_cursor,
843 .alloc_block = xfs_bmbt_alloc_block,
844 .free_block = xfs_bmbt_free_block,
845 .get_maxrecs = xfs_bmbt_get_maxrecs,
846 .get_minrecs = xfs_bmbt_get_minrecs,
847 .get_dmaxrecs = xfs_bmbt_get_dmaxrecs,
848 .init_key_from_rec = xfs_bmbt_init_key_from_rec,
849 .init_rec_from_key = xfs_bmbt_init_rec_from_key,
850 .init_rec_from_cur = xfs_bmbt_init_rec_from_cur,
851 .init_ptr_from_cur = xfs_bmbt_init_ptr_from_cur,
852 .key_diff = xfs_bmbt_key_diff,
853 .buf_ops = &xfs_bmbt_buf_ops,
854 #if defined(DEBUG) || defined(XFS_WARN)
855 .keys_inorder = xfs_bmbt_keys_inorder,
856 .recs_inorder = xfs_bmbt_recs_inorder,
857 #endif
858 };
859
860 /*
861 * Allocate a new bmap btree cursor.
862 */
863 struct xfs_btree_cur * /* new bmap btree cursor */
864 xfs_bmbt_init_cursor(
865 struct xfs_mount *mp, /* file system mount point */
866 struct xfs_trans *tp, /* transaction pointer */
867 struct xfs_inode *ip, /* inode owning the btree */
868 int whichfork) /* data or attr fork */
869 {
870 struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
871 struct xfs_btree_cur *cur;
872
873 cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_SLEEP);
874
875 cur->bc_tp = tp;
876 cur->bc_mp = mp;
877 cur->bc_nlevels = be16_to_cpu(ifp->if_broot->bb_level) + 1;
878 cur->bc_btnum = XFS_BTNUM_BMAP;
879 cur->bc_blocklog = mp->m_sb.sb_blocklog;
880
881 cur->bc_ops = &xfs_bmbt_ops;
882 cur->bc_flags = XFS_BTREE_LONG_PTRS | XFS_BTREE_ROOT_IN_INODE;
883 if (xfs_sb_version_hascrc(&mp->m_sb))
884 cur->bc_flags |= XFS_BTREE_CRC_BLOCKS;
885
886 cur->bc_private.b.forksize = XFS_IFORK_SIZE(ip, whichfork);
887 cur->bc_private.b.ip = ip;
888 cur->bc_private.b.firstblock = NULLFSBLOCK;
889 cur->bc_private.b.flist = NULL;
890 cur->bc_private.b.allocated = 0;
891 cur->bc_private.b.flags = 0;
892 cur->bc_private.b.whichfork = whichfork;
893
894 return cur;
895 }
896
897 /*
898 * Calculate number of records in a bmap btree block.
899 */
900 int
901 xfs_bmbt_maxrecs(
902 struct xfs_mount *mp,
903 int blocklen,
904 int leaf)
905 {
906 blocklen -= XFS_BMBT_BLOCK_LEN(mp);
907
908 if (leaf)
909 return blocklen / sizeof(xfs_bmbt_rec_t);
910 return blocklen / (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t));
911 }
912
913 /*
914 * Calculate number of records in a bmap btree inode root.
915 */
916 int
917 xfs_bmdr_maxrecs(
918 struct xfs_mount *mp,
919 int blocklen,
920 int leaf)
921 {
922 blocklen -= sizeof(xfs_bmdr_block_t);
923
924 if (leaf)
925 return blocklen / sizeof(xfs_bmdr_rec_t);
926 return blocklen / (sizeof(xfs_bmdr_key_t) + sizeof(xfs_bmdr_ptr_t));
927 }
928
929 /*
930 * Change the owner of a btree format fork fo the inode passed in. Change it to
931 * the owner of that is passed in so that we can change owners before or after
932 * we switch forks between inodes. The operation that the caller is doing will
933 * determine whether is needs to change owner before or after the switch.
934 *
935 * For demand paged transactional modification, the fork switch should be done
936 * after reading in all the blocks, modifying them and pinning them in the
937 * transaction. For modification when the buffers are already pinned in memory,
938 * the fork switch can be done before changing the owner as we won't need to
939 * validate the owner until the btree buffers are unpinned and writes can occur
940 * again.
941 *
942 * For recovery based ownership change, there is no transactional context and
943 * so a buffer list must be supplied so that we can record the buffers that we
944 * modified for the caller to issue IO on.
945 */
946 int
947 xfs_bmbt_change_owner(
948 struct xfs_trans *tp,
949 struct xfs_inode *ip,
950 int whichfork,
951 xfs_ino_t new_owner,
952 struct list_head *buffer_list)
953 {
954 struct xfs_btree_cur *cur;
955 int error;
956
957 ASSERT(tp || buffer_list);
958 ASSERT(!(tp && buffer_list));
959 if (whichfork == XFS_DATA_FORK)
960 ASSERT(ip->i_d.di_format == XFS_DINODE_FMT_BTREE);
961 else
962 ASSERT(ip->i_d.di_aformat == XFS_DINODE_FMT_BTREE);
963
964 cur = xfs_bmbt_init_cursor(ip->i_mount, tp, ip, whichfork);
965 if (!cur)
966 return ENOMEM;
967
968 error = xfs_btree_change_owner(cur, new_owner, buffer_list);
969 xfs_btree_del_cursor(cur, error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
970 return error;
971 }
Linux with added FPC-III support