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mm-only debug patch...
[mmotm.git] / fs / xfs / xfs_bmap_btree.c
blobeb7b702d0690f673e3b86d178379b8eeb511bb67
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_types.h"
21 #include "xfs_bit.h"
22 #include "xfs_log.h"
23 #include "xfs_inum.h"
24 #include "xfs_trans.h"
25 #include "xfs_sb.h"
26 #include "xfs_ag.h"
27 #include "xfs_dir2.h"
28 #include "xfs_dmapi.h"
29 #include "xfs_mount.h"
30 #include "xfs_bmap_btree.h"
31 #include "xfs_alloc_btree.h"
32 #include "xfs_ialloc_btree.h"
33 #include "xfs_dir2_sf.h"
34 #include "xfs_attr_sf.h"
35 #include "xfs_dinode.h"
36 #include "xfs_inode.h"
37 #include "xfs_inode_item.h"
38 #include "xfs_alloc.h"
39 #include "xfs_btree.h"
40 #include "xfs_btree_trace.h"
41 #include "xfs_ialloc.h"
42 #include "xfs_itable.h"
43 #include "xfs_bmap.h"
44 #include "xfs_error.h"
45 #include "xfs_quota.h"
46
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
63 /*
64 * Convert on-disk form of btree root to in-memory form.
65 */
66 void
67 xfs_bmdr_to_bmbt(
68 struct xfs_mount *mp,
69 xfs_bmdr_block_t *dblock,
70 int dblocklen,
71 struct xfs_btree_block *rblock,
72 int rblocklen)
73 {
74 int dmxr;
75 xfs_bmbt_key_t *fkp;
76 __be64 *fpp;
77 xfs_bmbt_key_t *tkp;
78 __be64 *tpp;
79
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;
84 rblock->bb_u.l.bb_leftsib = cpu_to_be64(NULLDFSBNO);
85 rblock->bb_u.l.bb_rightsib = cpu_to_be64(NULLDFSBNO);
86 dmxr = xfs_bmdr_maxrecs(mp, dblocklen, 0);
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);
90 tpp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, rblocklen);
91 dmxr = be16_to_cpu(dblock->bb_numrecs);
92 memcpy(tkp, fkp, sizeof(*fkp) * dmxr);
93 memcpy(tpp, fpp, sizeof(*fpp) * dmxr);
94 }
95
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
102 STATIC_INLINE void
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 &
113 xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
114 #if XFS_BIG_BLKNOS
115 s->br_startblock = (((xfs_fsblock_t)l0 & xfs_mask64lo(9)) << 43) |
116 (((xfs_fsblock_t)l1) >> 21);
117 #else
118 #ifdef DEBUG
119 {
120 xfs_dfsbno_t b;
121
122 b = (((xfs_dfsbno_t)l0 & xfs_mask64lo(9)) << 43) |
123 (((xfs_dfsbno_t)l1) >> 21);
124 ASSERT((b >> 32) == 0 || isnulldstartblock(b));
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 */
131 s->br_blockcount = (xfs_filblks_t)(l1 & xfs_mask64lo(21));
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(
143 xfs_bmbt_rec_host_t *r,
144 xfs_bmbt_irec_t *s)
145 {
146 __xfs_bmbt_get_all(r->l0, r->l1, s);
147 }
148
149 /*
150 * Extract the blockcount field from an in memory bmap extent record.
151 */
152 xfs_filblks_t
153 xfs_bmbt_get_blockcount(
154 xfs_bmbt_rec_host_t *r)
155 {
156 return (xfs_filblks_t)(r->l1 & xfs_mask64lo(21));
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(
164 xfs_bmbt_rec_host_t *r)
165 {
166 #if XFS_BIG_BLKNOS
167 return (((xfs_fsblock_t)r->l0 & xfs_mask64lo(9)) << 43) |
168 (((xfs_fsblock_t)r->l1) >> 21);
169 #else
170 #ifdef DEBUG
171 xfs_dfsbno_t b;
172
173 b = (((xfs_dfsbno_t)r->l0 & xfs_mask64lo(9)) << 43) |
174 (((xfs_dfsbno_t)r->l1) >> 21);
175 ASSERT((b >> 32) == 0 || isnulldstartblock(b));
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(
188 xfs_bmbt_rec_host_t *r)
189 {
190 return ((xfs_fileoff_t)r->l0 &
191 xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
192 }
193
194 xfs_exntst_t
195 xfs_bmbt_get_state(
196 xfs_bmbt_rec_host_t *r)
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
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 {
212 return (xfs_filblks_t)(be64_to_cpu(r->l1) & xfs_mask64lo(21));
213 }
214
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 {
222 return ((xfs_fileoff_t)be64_to_cpu(r->l0) &
223 xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
224 }
225
226
227 /*
228 * Set all the fields in a bmap extent record from the arguments.
229 */
230 void
231 xfs_bmbt_set_allf(
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)
237 {
238 int extent_flag = (state == XFS_EXT_NORM) ? 0 : 1;
239
240 ASSERT(state == XFS_EXT_NORM || state == XFS_EXT_UNWRITTEN);
241 ASSERT((startoff & xfs_mask64hi(64-BMBT_STARTOFF_BITLEN)) == 0);
242 ASSERT((blockcount & xfs_mask64hi(64-BMBT_BLOCKCOUNT_BITLEN)) == 0);
243
244 #if XFS_BIG_BLKNOS
245 ASSERT((startblock & xfs_mask64hi(64-BMBT_STARTBLOCK_BITLEN)) == 0);
246
247 r->l0 = ((xfs_bmbt_rec_base_t)extent_flag << 63) |
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 &
252 (xfs_bmbt_rec_base_t)xfs_mask64lo(21));
253 #else /* !XFS_BIG_BLKNOS */
254 if (isnullstartblock(startblock)) {
255 r->l0 = ((xfs_bmbt_rec_base_t)extent_flag << 63) |
256 ((xfs_bmbt_rec_base_t)startoff << 9) |
257 (xfs_bmbt_rec_base_t)xfs_mask64lo(9);
258 r->l1 = xfs_mask64hi(11) |
259 ((xfs_bmbt_rec_base_t)startblock << 21) |
260 ((xfs_bmbt_rec_base_t)blockcount &
261 (xfs_bmbt_rec_base_t)xfs_mask64lo(21));
262 } else {
263 r->l0 = ((xfs_bmbt_rec_base_t)extent_flag << 63) |
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 &
267 (xfs_bmbt_rec_base_t)xfs_mask64lo(21));
268 }
269 #endif /* XFS_BIG_BLKNOS */
270 }
271
272 /*
273 * Set all the fields in a bmap extent record from the uncompressed form.
274 */
275 void
276 xfs_bmbt_set_all(
277 xfs_bmbt_rec_host_t *r,
278 xfs_bmbt_irec_t *s)
279 {
280 xfs_bmbt_set_allf(r, s->br_startoff, s->br_startblock,
281 s->br_blockcount, s->br_state);
282 }
283
284
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(
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)
295 {
296 int extent_flag = (state == XFS_EXT_NORM) ? 0 : 1;
297
298 ASSERT(state == XFS_EXT_NORM || state == XFS_EXT_UNWRITTEN);
299 ASSERT((startoff & xfs_mask64hi(64-BMBT_STARTOFF_BITLEN)) == 0);
300 ASSERT((blockcount & xfs_mask64hi(64-BMBT_BLOCKCOUNT_BITLEN)) == 0);
301
302 #if XFS_BIG_BLKNOS
303 ASSERT((startblock & xfs_mask64hi(64-BMBT_STARTBLOCK_BITLEN)) == 0);
304
305 r->l0 = cpu_to_be64(
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));
309 r->l1 = cpu_to_be64(
310 ((xfs_bmbt_rec_base_t)startblock << 21) |
311 ((xfs_bmbt_rec_base_t)blockcount &
312 (xfs_bmbt_rec_base_t)xfs_mask64lo(21)));
313 #else /* !XFS_BIG_BLKNOS */
314 if (isnullstartblock(startblock)) {
315 r->l0 = cpu_to_be64(
316 ((xfs_bmbt_rec_base_t)extent_flag << 63) |
317 ((xfs_bmbt_rec_base_t)startoff << 9) |
318 (xfs_bmbt_rec_base_t)xfs_mask64lo(9));
319 r->l1 = cpu_to_be64(xfs_mask64hi(11) |
320 ((xfs_bmbt_rec_base_t)startblock << 21) |
321 ((xfs_bmbt_rec_base_t)blockcount &
322 (xfs_bmbt_rec_base_t)xfs_mask64lo(21)));
323 } else {
324 r->l0 = cpu_to_be64(
325 ((xfs_bmbt_rec_base_t)extent_flag << 63) |
326 ((xfs_bmbt_rec_base_t)startoff << 9));
327 r->l1 = cpu_to_be64(
328 ((xfs_bmbt_rec_base_t)startblock << 21) |
329 ((xfs_bmbt_rec_base_t)blockcount &
330 (xfs_bmbt_rec_base_t)xfs_mask64lo(21)));
331 }
332 #endif /* XFS_BIG_BLKNOS */
333 }
334
335 /*
336 * Set all the fields in a bmap extent record from the uncompressed form.
337 */
338 void
339 xfs_bmbt_disk_set_all(
340 xfs_bmbt_rec_t *r,
341 xfs_bmbt_irec_t *s)
342 {
343 xfs_bmbt_disk_set_allf(r, s->br_startoff, s->br_startblock,
344 s->br_blockcount, s->br_state);
345 }
346
347 /*
348 * Set the blockcount field in a bmap extent record.
349 */
350 void
351 xfs_bmbt_set_blockcount(
352 xfs_bmbt_rec_host_t *r,
353 xfs_filblks_t v)
354 {
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));
358 }
359
360 /*
361 * Set the startblock field in a bmap extent record.
362 */
363 void
364 xfs_bmbt_set_startblock(
365 xfs_bmbt_rec_host_t *r,
366 xfs_fsblock_t v)
367 {
368 #if XFS_BIG_BLKNOS
369 ASSERT((v & xfs_mask64hi(12)) == 0);
370 r->l0 = (r->l0 & (xfs_bmbt_rec_base_t)xfs_mask64hi(55)) |
371 (xfs_bmbt_rec_base_t)(v >> 43);
372 r->l1 = (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64lo(21)) |
373 (xfs_bmbt_rec_base_t)(v << 21);
374 #else /* !XFS_BIG_BLKNOS */
375 if (isnullstartblock(v)) {
376 r->l0 |= (xfs_bmbt_rec_base_t)xfs_mask64lo(9);
377 r->l1 = (xfs_bmbt_rec_base_t)xfs_mask64hi(11) |
378 ((xfs_bmbt_rec_base_t)v << 21) |
379 (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64lo(21));
380 } else {
381 r->l0 &= ~(xfs_bmbt_rec_base_t)xfs_mask64lo(9);
382 r->l1 = ((xfs_bmbt_rec_base_t)v << 21) |
383 (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64lo(21));
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(
393 xfs_bmbt_rec_host_t *r,
394 xfs_fileoff_t v)
395 {
396 ASSERT((v & xfs_mask64hi(9)) == 0);
397 r->l0 = (r->l0 & (xfs_bmbt_rec_base_t) xfs_mask64hi(1)) |
398 ((xfs_bmbt_rec_base_t)v << 9) |
399 (r->l0 & (xfs_bmbt_rec_base_t)xfs_mask64lo(9));
400 }
401
402 /*
403 * Set the extent state field in a bmap extent record.
404 */
405 void
406 xfs_bmbt_set_state(
407 xfs_bmbt_rec_host_t *r,
408 xfs_exntst_t v)
409 {
410 ASSERT(v == XFS_EXT_NORM || v == XFS_EXT_UNWRITTEN);
411 if (v == XFS_EXT_NORM)
412 r->l0 &= xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN);
413 else
414 r->l0 |= xfs_mask64hi(BMBT_EXNTFLAG_BITLEN);
415 }
416
417 /*
418 * Convert in-memory form of btree root to on-disk form.
419 */
420 void
421 xfs_bmbt_to_bmdr(
422 struct xfs_mount *mp,
423 struct xfs_btree_block *rblock,
424 int rblocklen,
425 xfs_bmdr_block_t *dblock,
426 int dblocklen)
427 {
428 int dmxr;
429 xfs_bmbt_key_t *fkp;
430 __be64 *fpp;
431 xfs_bmbt_key_t *tkp;
432 __be64 *tpp;
433
434 ASSERT(be32_to_cpu(rblock->bb_magic) == XFS_BMAP_MAGIC);
435 ASSERT(be64_to_cpu(rblock->bb_u.l.bb_leftsib) == NULLDFSBNO);
436 ASSERT(be64_to_cpu(rblock->bb_u.l.bb_rightsib) == NULLDFSBNO);
437 ASSERT(be16_to_cpu(rblock->bb_level) > 0);
438 dblock->bb_level = rblock->bb_level;
439 dblock->bb_numrecs = rblock->bb_numrecs;
440 dmxr = xfs_bmdr_maxrecs(mp, dblocklen, 0);
441 fkp = XFS_BMBT_KEY_ADDR(mp, rblock, 1);
442 tkp = XFS_BMDR_KEY_ADDR(dblock, 1);
443 fpp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, rblocklen);
444 tpp = XFS_BMDR_PTR_ADDR(dblock, 1, dmxr);
445 dmxr = be16_to_cpu(dblock->bb_numrecs);
446 memcpy(tkp, fkp, sizeof(*fkp) * dmxr);
447 memcpy(tpp, fpp, sizeof(*fpp) * dmxr);
448 }
449
450 /*
451 * Check extent records, which have just been read, for
452 * any bit in the extent flag field. ASSERT on debug
453 * kernels, as this condition should not occur.
454 * Return an error condition (1) if any flags found,
455 * otherwise return 0.
456 */
457
458 int
459 xfs_check_nostate_extents(
460 xfs_ifork_t *ifp,
461 xfs_extnum_t idx,
462 xfs_extnum_t num)
463 {
464 for (; num > 0; num--, idx++) {
465 xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, idx);
466 if ((ep->l0 >>
467 (64 - BMBT_EXNTFLAG_BITLEN)) != 0) {
468 ASSERT(0);
469 return 1;
470 }
471 }
472 return 0;
473 }
474
475
476 STATIC struct xfs_btree_cur *
477 xfs_bmbt_dup_cursor(
478 struct xfs_btree_cur *cur)
479 {
480 struct xfs_btree_cur *new;
481
482 new = xfs_bmbt_init_cursor(cur->bc_mp, cur->bc_tp,
483 cur->bc_private.b.ip, cur->bc_private.b.whichfork);
484
485 /*
486 * Copy the firstblock, flist, and flags values,
487 * since init cursor doesn't get them.
488 */
489 new->bc_private.b.firstblock = cur->bc_private.b.firstblock;
490 new->bc_private.b.flist = cur->bc_private.b.flist;
491 new->bc_private.b.flags = cur->bc_private.b.flags;
492
493 return new;
494 }
495
496 STATIC void
497 xfs_bmbt_update_cursor(
498 struct xfs_btree_cur *src,
499 struct xfs_btree_cur *dst)
500 {
501 ASSERT((dst->bc_private.b.firstblock != NULLFSBLOCK) ||
502 (dst->bc_private.b.ip->i_d.di_flags & XFS_DIFLAG_REALTIME));
503 ASSERT(dst->bc_private.b.flist == src->bc_private.b.flist);
504
505 dst->bc_private.b.allocated += src->bc_private.b.allocated;
506 dst->bc_private.b.firstblock = src->bc_private.b.firstblock;
507
508 src->bc_private.b.allocated = 0;
509 }
510
511 STATIC int
512 xfs_bmbt_alloc_block(
513 struct xfs_btree_cur *cur,
514 union xfs_btree_ptr *start,
515 union xfs_btree_ptr *new,
516 int length,
517 int *stat)
518 {
519 xfs_alloc_arg_t args; /* block allocation args */
520 int error; /* error return value */
521
522 memset(&args, 0, sizeof(args));
523 args.tp = cur->bc_tp;
524 args.mp = cur->bc_mp;
525 args.fsbno = cur->bc_private.b.firstblock;
526 args.firstblock = args.fsbno;
527
528 if (args.fsbno == NULLFSBLOCK) {
529 args.fsbno = be64_to_cpu(start->l);
530 args.type = XFS_ALLOCTYPE_START_BNO;
531 /*
532 * Make sure there is sufficient room left in the AG to
533 * complete a full tree split for an extent insert. If
534 * we are converting the middle part of an extent then
535 * we may need space for two tree splits.
536 *
537 * We are relying on the caller to make the correct block
538 * reservation for this operation to succeed. If the
539 * reservation amount is insufficient then we may fail a
540 * block allocation here and corrupt the filesystem.
541 */
542 args.minleft = xfs_trans_get_block_res(args.tp);
543 } else if (cur->bc_private.b.flist->xbf_low) {
544 args.type = XFS_ALLOCTYPE_START_BNO;
545 } else {
546 args.type = XFS_ALLOCTYPE_NEAR_BNO;
547 }
548
549 args.minlen = args.maxlen = args.prod = 1;
550 args.wasdel = cur->bc_private.b.flags & XFS_BTCUR_BPRV_WASDEL;
551 if (!args.wasdel && xfs_trans_get_block_res(args.tp) == 0) {
552 error = XFS_ERROR(ENOSPC);
553 goto error0;
554 }
555 error = xfs_alloc_vextent(&args);
556 if (error)
557 goto error0;
558
559 if (args.fsbno == NULLFSBLOCK && args.minleft) {
560 /*
561 * Could not find an AG with enough free space to satisfy
562 * a full btree split. Try again without minleft and if
563 * successful activate the lowspace algorithm.
564 */
565 args.fsbno = 0;
566 args.type = XFS_ALLOCTYPE_FIRST_AG;
567 args.minleft = 0;
568 error = xfs_alloc_vextent(&args);
569 if (error)
570 goto error0;
571 cur->bc_private.b.flist->xbf_low = 1;
572 }
573 if (args.fsbno == NULLFSBLOCK) {
574 XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
575 *stat = 0;
576 return 0;
577 }
578 ASSERT(args.len == 1);
579 cur->bc_private.b.firstblock = args.fsbno;
580 cur->bc_private.b.allocated++;
581 cur->bc_private.b.ip->i_d.di_nblocks++;
582 xfs_trans_log_inode(args.tp, cur->bc_private.b.ip, XFS_ILOG_CORE);
583 xfs_trans_mod_dquot_byino(args.tp, cur->bc_private.b.ip,
584 XFS_TRANS_DQ_BCOUNT, 1L);
585
586 new->l = cpu_to_be64(args.fsbno);
587
588 XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
589 *stat = 1;
590 return 0;
591
592 error0:
593 XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
594 return error;
595 }
596
597 STATIC int
598 xfs_bmbt_free_block(
599 struct xfs_btree_cur *cur,
600 struct xfs_buf *bp)
601 {
602 struct xfs_mount *mp = cur->bc_mp;
603 struct xfs_inode *ip = cur->bc_private.b.ip;
604 struct xfs_trans *tp = cur->bc_tp;
605 xfs_fsblock_t fsbno = XFS_DADDR_TO_FSB(mp, XFS_BUF_ADDR(bp));
606
607 xfs_bmap_add_free(fsbno, 1, cur->bc_private.b.flist, mp);
608 ip->i_d.di_nblocks--;
609
610 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
611 xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
612 xfs_trans_binval(tp, bp);
613 return 0;
614 }
615
616 STATIC int
617 xfs_bmbt_get_minrecs(
618 struct xfs_btree_cur *cur,
619 int level)
620 {
621 if (level == cur->bc_nlevels - 1) {
622 struct xfs_ifork *ifp;
623
624 ifp = XFS_IFORK_PTR(cur->bc_private.b.ip,
625 cur->bc_private.b.whichfork);
626
627 return xfs_bmbt_maxrecs(cur->bc_mp,
628 ifp->if_broot_bytes, level == 0) / 2;
629 }
630
631 return cur->bc_mp->m_bmap_dmnr[level != 0];
632 }
633
634 int
635 xfs_bmbt_get_maxrecs(
636 struct xfs_btree_cur *cur,
637 int level)
638 {
639 if (level == cur->bc_nlevels - 1) {
640 struct xfs_ifork *ifp;
641
642 ifp = XFS_IFORK_PTR(cur->bc_private.b.ip,
643 cur->bc_private.b.whichfork);
644
645 return xfs_bmbt_maxrecs(cur->bc_mp,
646 ifp->if_broot_bytes, level == 0);
647 }
648
649 return cur->bc_mp->m_bmap_dmxr[level != 0];
650
651 }
652
653 /*
654 * Get the maximum records we could store in the on-disk format.
655 *
656 * For non-root nodes this is equivalent to xfs_bmbt_get_maxrecs, but
657 * for the root node this checks the available space in the dinode fork
658 * so that we can resize the in-memory buffer to match it. After a
659 * resize to the maximum size this function returns the same value
660 * as xfs_bmbt_get_maxrecs for the root node, too.
661 */
662 STATIC int
663 xfs_bmbt_get_dmaxrecs(
664 struct xfs_btree_cur *cur,
665 int level)
666 {
667 if (level != cur->bc_nlevels - 1)
668 return cur->bc_mp->m_bmap_dmxr[level != 0];
669 return xfs_bmdr_maxrecs(cur->bc_mp, cur->bc_private.b.forksize,
670 level == 0);
671 }
672
673 STATIC void
674 xfs_bmbt_init_key_from_rec(
675 union xfs_btree_key *key,
676 union xfs_btree_rec *rec)
677 {
678 key->bmbt.br_startoff =
679 cpu_to_be64(xfs_bmbt_disk_get_startoff(&rec->bmbt));
680 }
681
682 STATIC void
683 xfs_bmbt_init_rec_from_key(
684 union xfs_btree_key *key,
685 union xfs_btree_rec *rec)
686 {
687 ASSERT(key->bmbt.br_startoff != 0);
688
689 xfs_bmbt_disk_set_allf(&rec->bmbt, be64_to_cpu(key->bmbt.br_startoff),
690 0, 0, XFS_EXT_NORM);
691 }
692
693 STATIC void
694 xfs_bmbt_init_rec_from_cur(
695 struct xfs_btree_cur *cur,
696 union xfs_btree_rec *rec)
697 {
698 xfs_bmbt_disk_set_all(&rec->bmbt, &cur->bc_rec.b);
699 }
700
701 STATIC void
702 xfs_bmbt_init_ptr_from_cur(
703 struct xfs_btree_cur *cur,
704 union xfs_btree_ptr *ptr)
705 {
706 ptr->l = 0;
707 }
708
709 STATIC __int64_t
710 xfs_bmbt_key_diff(
711 struct xfs_btree_cur *cur,
712 union xfs_btree_key *key)
713 {
714 return (__int64_t)be64_to_cpu(key->bmbt.br_startoff) -
715 cur->bc_rec.b.br_startoff;
716 }
717
718 #ifdef DEBUG
719 STATIC int
720 xfs_bmbt_keys_inorder(
721 struct xfs_btree_cur *cur,
722 union xfs_btree_key *k1,
723 union xfs_btree_key *k2)
724 {
725 return be64_to_cpu(k1->bmbt.br_startoff) <
726 be64_to_cpu(k2->bmbt.br_startoff);
727 }
728
729 STATIC int
730 xfs_bmbt_recs_inorder(
731 struct xfs_btree_cur *cur,
732 union xfs_btree_rec *r1,
733 union xfs_btree_rec *r2)
734 {
735 return xfs_bmbt_disk_get_startoff(&r1->bmbt) +
736 xfs_bmbt_disk_get_blockcount(&r1->bmbt) <=
737 xfs_bmbt_disk_get_startoff(&r2->bmbt);
738 }
739 #endif /* DEBUG */
740
741 #ifdef XFS_BTREE_TRACE
742 ktrace_t *xfs_bmbt_trace_buf;
743
744 STATIC void
745 xfs_bmbt_trace_enter(
746 struct xfs_btree_cur *cur,
747 const char *func,
748 char *s,
749 int type,
750 int line,
751 __psunsigned_t a0,
752 __psunsigned_t a1,
753 __psunsigned_t a2,
754 __psunsigned_t a3,
755 __psunsigned_t a4,
756 __psunsigned_t a5,
757 __psunsigned_t a6,
758 __psunsigned_t a7,
759 __psunsigned_t a8,
760 __psunsigned_t a9,
761 __psunsigned_t a10)
762 {
763 struct xfs_inode *ip = cur->bc_private.b.ip;
764 int whichfork = cur->bc_private.b.whichfork;
765
766 ktrace_enter(xfs_bmbt_trace_buf,
767 (void *)((__psint_t)type | (whichfork << 8) | (line << 16)),
768 (void *)func, (void *)s, (void *)ip, (void *)cur,
769 (void *)a0, (void *)a1, (void *)a2, (void *)a3,
770 (void *)a4, (void *)a5, (void *)a6, (void *)a7,
771 (void *)a8, (void *)a9, (void *)a10);
772 ktrace_enter(ip->i_btrace,
773 (void *)((__psint_t)type | (whichfork << 8) | (line << 16)),
774 (void *)func, (void *)s, (void *)ip, (void *)cur,
775 (void *)a0, (void *)a1, (void *)a2, (void *)a3,
776 (void *)a4, (void *)a5, (void *)a6, (void *)a7,
777 (void *)a8, (void *)a9, (void *)a10);
778 }
779
780 STATIC void
781 xfs_bmbt_trace_cursor(
782 struct xfs_btree_cur *cur,
783 __uint32_t *s0,
784 __uint64_t *l0,
785 __uint64_t *l1)
786 {
787 struct xfs_bmbt_rec_host r;
788
789 xfs_bmbt_set_all(&r, &cur->bc_rec.b);
790
791 *s0 = (cur->bc_nlevels << 24) |
792 (cur->bc_private.b.flags << 16) |
793 cur->bc_private.b.allocated;
794 *l0 = r.l0;
795 *l1 = r.l1;
796 }
797
798 STATIC void
799 xfs_bmbt_trace_key(
800 struct xfs_btree_cur *cur,
801 union xfs_btree_key *key,
802 __uint64_t *l0,
803 __uint64_t *l1)
804 {
805 *l0 = be64_to_cpu(key->bmbt.br_startoff);
806 *l1 = 0;
807 }
808
809 /* Endian flipping versions of the bmbt extraction functions */
810 STATIC void
811 xfs_bmbt_disk_get_all(
812 xfs_bmbt_rec_t *r,
813 xfs_bmbt_irec_t *s)
814 {
815 __xfs_bmbt_get_all(get_unaligned_be64(&r->l0),
816 get_unaligned_be64(&r->l1), s);
817 }
818
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
836 static const struct xfs_btree_ops xfs_bmbt_ops = {
837 .rec_len = sizeof(xfs_bmbt_rec_t),
838 .key_len = sizeof(xfs_bmbt_key_t),
839
840 .dup_cursor = xfs_bmbt_dup_cursor,
841 .update_cursor = xfs_bmbt_update_cursor,
842 .alloc_block = xfs_bmbt_alloc_block,
843 .free_block = xfs_bmbt_free_block,
844 .get_maxrecs = xfs_bmbt_get_maxrecs,
845 .get_minrecs = xfs_bmbt_get_minrecs,
846 .get_dmaxrecs = xfs_bmbt_get_dmaxrecs,
847 .init_key_from_rec = xfs_bmbt_init_key_from_rec,
848 .init_rec_from_key = xfs_bmbt_init_rec_from_key,
849 .init_rec_from_cur = xfs_bmbt_init_rec_from_cur,
850 .init_ptr_from_cur = xfs_bmbt_init_ptr_from_cur,
851 .key_diff = xfs_bmbt_key_diff,
852
853 #ifdef DEBUG
854 .keys_inorder = xfs_bmbt_keys_inorder,
855 .recs_inorder = xfs_bmbt_recs_inorder,
856 #endif
857
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
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;
888 cur->bc_flags = XFS_BTREE_LONG_PTRS | XFS_BTREE_ROOT_IN_INODE;
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 }
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 {
910 blocklen -= XFS_BMBT_BLOCK_LEN(mp);
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 }
mm of the moment repository