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Input: penmount - add PenMount 3000 support
[linux-2.6/kvm.git] / fs / xfs / xfs_bmap_btree.c
blobe2f5d59cbeaff59470f025ba79305b6f53e3316d
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_mount.h"
28 #include "xfs_bmap_btree.h"
29 #include "xfs_alloc_btree.h"
30 #include "xfs_ialloc_btree.h"
31 #include "xfs_dinode.h"
32 #include "xfs_inode.h"
33 #include "xfs_inode_item.h"
34 #include "xfs_alloc.h"
35 #include "xfs_btree.h"
36 #include "xfs_itable.h"
37 #include "xfs_bmap.h"
38 #include "xfs_error.h"
39 #include "xfs_quota.h"
40
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
57 /*
58 * Convert on-disk form of btree root to in-memory form.
59 */
60 void
61 xfs_bmdr_to_bmbt(
62 struct xfs_mount *mp,
63 xfs_bmdr_block_t *dblock,
64 int dblocklen,
65 struct xfs_btree_block *rblock,
66 int rblocklen)
67 {
68 int dmxr;
69 xfs_bmbt_key_t *fkp;
70 __be64 *fpp;
71 xfs_bmbt_key_t *tkp;
72 __be64 *tpp;
73
74 rblock->bb_magic = cpu_to_be32(XFS_BMAP_MAGIC);
75 rblock->bb_level = dblock->bb_level;
76 ASSERT(be16_to_cpu(rblock->bb_level) > 0);
77 rblock->bb_numrecs = dblock->bb_numrecs;
78 rblock->bb_u.l.bb_leftsib = cpu_to_be64(NULLDFSBNO);
79 rblock->bb_u.l.bb_rightsib = cpu_to_be64(NULLDFSBNO);
80 dmxr = xfs_bmdr_maxrecs(mp, dblocklen, 0);
81 fkp = XFS_BMDR_KEY_ADDR(dblock, 1);
82 tkp = XFS_BMBT_KEY_ADDR(mp, rblock, 1);
83 fpp = XFS_BMDR_PTR_ADDR(dblock, 1, dmxr);
84 tpp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, rblocklen);
85 dmxr = be16_to_cpu(dblock->bb_numrecs);
86 memcpy(tkp, fkp, sizeof(*fkp) * dmxr);
87 memcpy(tpp, fpp, sizeof(*fpp) * dmxr);
88 }
89
90 /*
91 * Convert a compressed bmap extent record to an uncompressed form.
92 * This code must be in sync with the routines xfs_bmbt_get_startoff,
93 * xfs_bmbt_get_startblock, xfs_bmbt_get_blockcount and xfs_bmbt_get_state.
94 */
95 STATIC void
96 __xfs_bmbt_get_all(
97 __uint64_t l0,
98 __uint64_t l1,
99 xfs_bmbt_irec_t *s)
100 {
101 int ext_flag;
102 xfs_exntst_t st;
103
104 ext_flag = (int)(l0 >> (64 - BMBT_EXNTFLAG_BITLEN));
105 s->br_startoff = ((xfs_fileoff_t)l0 &
106 xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
107 #if XFS_BIG_BLKNOS
108 s->br_startblock = (((xfs_fsblock_t)l0 & xfs_mask64lo(9)) << 43) |
109 (((xfs_fsblock_t)l1) >> 21);
110 #else
111 #ifdef DEBUG
112 {
113 xfs_dfsbno_t b;
114
115 b = (((xfs_dfsbno_t)l0 & xfs_mask64lo(9)) << 43) |
116 (((xfs_dfsbno_t)l1) >> 21);
117 ASSERT((b >> 32) == 0 || isnulldstartblock(b));
118 s->br_startblock = (xfs_fsblock_t)b;
119 }
120 #else /* !DEBUG */
121 s->br_startblock = (xfs_fsblock_t)(((xfs_dfsbno_t)l1) >> 21);
122 #endif /* DEBUG */
123 #endif /* XFS_BIG_BLKNOS */
124 s->br_blockcount = (xfs_filblks_t)(l1 & xfs_mask64lo(21));
125 /* This is xfs_extent_state() in-line */
126 if (ext_flag) {
127 ASSERT(s->br_blockcount != 0); /* saved for DMIG */
128 st = XFS_EXT_UNWRITTEN;
129 } else
130 st = XFS_EXT_NORM;
131 s->br_state = st;
132 }
133
134 void
135 xfs_bmbt_get_all(
136 xfs_bmbt_rec_host_t *r,
137 xfs_bmbt_irec_t *s)
138 {
139 __xfs_bmbt_get_all(r->l0, r->l1, s);
140 }
141
142 /*
143 * Extract the blockcount field from an in memory bmap extent record.
144 */
145 xfs_filblks_t
146 xfs_bmbt_get_blockcount(
147 xfs_bmbt_rec_host_t *r)
148 {
149 return (xfs_filblks_t)(r->l1 & xfs_mask64lo(21));
150 }
151
152 /*
153 * Extract the startblock field from an in memory bmap extent record.
154 */
155 xfs_fsblock_t
156 xfs_bmbt_get_startblock(
157 xfs_bmbt_rec_host_t *r)
158 {
159 #if XFS_BIG_BLKNOS
160 return (((xfs_fsblock_t)r->l0 & xfs_mask64lo(9)) << 43) |
161 (((xfs_fsblock_t)r->l1) >> 21);
162 #else
163 #ifdef DEBUG
164 xfs_dfsbno_t b;
165
166 b = (((xfs_dfsbno_t)r->l0 & xfs_mask64lo(9)) << 43) |
167 (((xfs_dfsbno_t)r->l1) >> 21);
168 ASSERT((b >> 32) == 0 || isnulldstartblock(b));
169 return (xfs_fsblock_t)b;
170 #else /* !DEBUG */
171 return (xfs_fsblock_t)(((xfs_dfsbno_t)r->l1) >> 21);
172 #endif /* DEBUG */
173 #endif /* XFS_BIG_BLKNOS */
174 }
175
176 /*
177 * Extract the startoff field from an in memory bmap extent record.
178 */
179 xfs_fileoff_t
180 xfs_bmbt_get_startoff(
181 xfs_bmbt_rec_host_t *r)
182 {
183 return ((xfs_fileoff_t)r->l0 &
184 xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
185 }
186
187 xfs_exntst_t
188 xfs_bmbt_get_state(
189 xfs_bmbt_rec_host_t *r)
190 {
191 int ext_flag;
192
193 ext_flag = (int)((r->l0) >> (64 - BMBT_EXNTFLAG_BITLEN));
194 return xfs_extent_state(xfs_bmbt_get_blockcount(r),
195 ext_flag);
196 }
197
198 /*
199 * Extract the blockcount field from an on disk bmap extent record.
200 */
201 xfs_filblks_t
202 xfs_bmbt_disk_get_blockcount(
203 xfs_bmbt_rec_t *r)
204 {
205 return (xfs_filblks_t)(be64_to_cpu(r->l1) & xfs_mask64lo(21));
206 }
207
208 /*
209 * Extract the startoff field from a disk format bmap extent record.
210 */
211 xfs_fileoff_t
212 xfs_bmbt_disk_get_startoff(
213 xfs_bmbt_rec_t *r)
214 {
215 return ((xfs_fileoff_t)be64_to_cpu(r->l0) &
216 xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
217 }
218
219
220 /*
221 * Set all the fields in a bmap extent record from the arguments.
222 */
223 void
224 xfs_bmbt_set_allf(
225 xfs_bmbt_rec_host_t *r,
226 xfs_fileoff_t startoff,
227 xfs_fsblock_t startblock,
228 xfs_filblks_t blockcount,
229 xfs_exntst_t state)
230 {
231 int extent_flag = (state == XFS_EXT_NORM) ? 0 : 1;
232
233 ASSERT(state == XFS_EXT_NORM || state == XFS_EXT_UNWRITTEN);
234 ASSERT((startoff & xfs_mask64hi(64-BMBT_STARTOFF_BITLEN)) == 0);
235 ASSERT((blockcount & xfs_mask64hi(64-BMBT_BLOCKCOUNT_BITLEN)) == 0);
236
237 #if XFS_BIG_BLKNOS
238 ASSERT((startblock & xfs_mask64hi(64-BMBT_STARTBLOCK_BITLEN)) == 0);
239
240 r->l0 = ((xfs_bmbt_rec_base_t)extent_flag << 63) |
241 ((xfs_bmbt_rec_base_t)startoff << 9) |
242 ((xfs_bmbt_rec_base_t)startblock >> 43);
243 r->l1 = ((xfs_bmbt_rec_base_t)startblock << 21) |
244 ((xfs_bmbt_rec_base_t)blockcount &
245 (xfs_bmbt_rec_base_t)xfs_mask64lo(21));
246 #else /* !XFS_BIG_BLKNOS */
247 if (isnullstartblock(startblock)) {
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)xfs_mask64lo(9);
251 r->l1 = xfs_mask64hi(11) |
252 ((xfs_bmbt_rec_base_t)startblock << 21) |
253 ((xfs_bmbt_rec_base_t)blockcount &
254 (xfs_bmbt_rec_base_t)xfs_mask64lo(21));
255 } else {
256 r->l0 = ((xfs_bmbt_rec_base_t)extent_flag << 63) |
257 ((xfs_bmbt_rec_base_t)startoff << 9);
258 r->l1 = ((xfs_bmbt_rec_base_t)startblock << 21) |
259 ((xfs_bmbt_rec_base_t)blockcount &
260 (xfs_bmbt_rec_base_t)xfs_mask64lo(21));
261 }
262 #endif /* XFS_BIG_BLKNOS */
263 }
264
265 /*
266 * Set all the fields in a bmap extent record from the uncompressed form.
267 */
268 void
269 xfs_bmbt_set_all(
270 xfs_bmbt_rec_host_t *r,
271 xfs_bmbt_irec_t *s)
272 {
273 xfs_bmbt_set_allf(r, s->br_startoff, s->br_startblock,
274 s->br_blockcount, s->br_state);
275 }
276
277
278 /*
279 * Set all the fields in a disk format bmap extent record from the arguments.
280 */
281 void
282 xfs_bmbt_disk_set_allf(
283 xfs_bmbt_rec_t *r,
284 xfs_fileoff_t startoff,
285 xfs_fsblock_t startblock,
286 xfs_filblks_t blockcount,
287 xfs_exntst_t state)
288 {
289 int extent_flag = (state == XFS_EXT_NORM) ? 0 : 1;
290
291 ASSERT(state == XFS_EXT_NORM || state == XFS_EXT_UNWRITTEN);
292 ASSERT((startoff & xfs_mask64hi(64-BMBT_STARTOFF_BITLEN)) == 0);
293 ASSERT((blockcount & xfs_mask64hi(64-BMBT_BLOCKCOUNT_BITLEN)) == 0);
294
295 #if XFS_BIG_BLKNOS
296 ASSERT((startblock & xfs_mask64hi(64-BMBT_STARTBLOCK_BITLEN)) == 0);
297
298 r->l0 = cpu_to_be64(
299 ((xfs_bmbt_rec_base_t)extent_flag << 63) |
300 ((xfs_bmbt_rec_base_t)startoff << 9) |
301 ((xfs_bmbt_rec_base_t)startblock >> 43));
302 r->l1 = cpu_to_be64(
303 ((xfs_bmbt_rec_base_t)startblock << 21) |
304 ((xfs_bmbt_rec_base_t)blockcount &
305 (xfs_bmbt_rec_base_t)xfs_mask64lo(21)));
306 #else /* !XFS_BIG_BLKNOS */
307 if (isnullstartblock(startblock)) {
308 r->l0 = cpu_to_be64(
309 ((xfs_bmbt_rec_base_t)extent_flag << 63) |
310 ((xfs_bmbt_rec_base_t)startoff << 9) |
311 (xfs_bmbt_rec_base_t)xfs_mask64lo(9));
312 r->l1 = cpu_to_be64(xfs_mask64hi(11) |
313 ((xfs_bmbt_rec_base_t)startblock << 21) |
314 ((xfs_bmbt_rec_base_t)blockcount &
315 (xfs_bmbt_rec_base_t)xfs_mask64lo(21)));
316 } else {
317 r->l0 = cpu_to_be64(
318 ((xfs_bmbt_rec_base_t)extent_flag << 63) |
319 ((xfs_bmbt_rec_base_t)startoff << 9));
320 r->l1 = cpu_to_be64(
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 }
325 #endif /* XFS_BIG_BLKNOS */
326 }
327
328 /*
329 * Set all the fields in a bmap extent record from the uncompressed form.
330 */
331 STATIC void
332 xfs_bmbt_disk_set_all(
333 xfs_bmbt_rec_t *r,
334 xfs_bmbt_irec_t *s)
335 {
336 xfs_bmbt_disk_set_allf(r, s->br_startoff, s->br_startblock,
337 s->br_blockcount, s->br_state);
338 }
339
340 /*
341 * Set the blockcount field in a bmap extent record.
342 */
343 void
344 xfs_bmbt_set_blockcount(
345 xfs_bmbt_rec_host_t *r,
346 xfs_filblks_t v)
347 {
348 ASSERT((v & xfs_mask64hi(43)) == 0);
349 r->l1 = (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64hi(43)) |
350 (xfs_bmbt_rec_base_t)(v & xfs_mask64lo(21));
351 }
352
353 /*
354 * Set the startblock field in a bmap extent record.
355 */
356 void
357 xfs_bmbt_set_startblock(
358 xfs_bmbt_rec_host_t *r,
359 xfs_fsblock_t v)
360 {
361 #if XFS_BIG_BLKNOS
362 ASSERT((v & xfs_mask64hi(12)) == 0);
363 r->l0 = (r->l0 & (xfs_bmbt_rec_base_t)xfs_mask64hi(55)) |
364 (xfs_bmbt_rec_base_t)(v >> 43);
365 r->l1 = (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64lo(21)) |
366 (xfs_bmbt_rec_base_t)(v << 21);
367 #else /* !XFS_BIG_BLKNOS */
368 if (isnullstartblock(v)) {
369 r->l0 |= (xfs_bmbt_rec_base_t)xfs_mask64lo(9);
370 r->l1 = (xfs_bmbt_rec_base_t)xfs_mask64hi(11) |
371 ((xfs_bmbt_rec_base_t)v << 21) |
372 (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64lo(21));
373 } else {
374 r->l0 &= ~(xfs_bmbt_rec_base_t)xfs_mask64lo(9);
375 r->l1 = ((xfs_bmbt_rec_base_t)v << 21) |
376 (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64lo(21));
377 }
378 #endif /* XFS_BIG_BLKNOS */
379 }
380
381 /*
382 * Set the startoff field in a bmap extent record.
383 */
384 void
385 xfs_bmbt_set_startoff(
386 xfs_bmbt_rec_host_t *r,
387 xfs_fileoff_t v)
388 {
389 ASSERT((v & xfs_mask64hi(9)) == 0);
390 r->l0 = (r->l0 & (xfs_bmbt_rec_base_t) xfs_mask64hi(1)) |
391 ((xfs_bmbt_rec_base_t)v << 9) |
392 (r->l0 & (xfs_bmbt_rec_base_t)xfs_mask64lo(9));
393 }
394
395 /*
396 * Set the extent state field in a bmap extent record.
397 */
398 void
399 xfs_bmbt_set_state(
400 xfs_bmbt_rec_host_t *r,
401 xfs_exntst_t v)
402 {
403 ASSERT(v == XFS_EXT_NORM || v == XFS_EXT_UNWRITTEN);
404 if (v == XFS_EXT_NORM)
405 r->l0 &= xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN);
406 else
407 r->l0 |= xfs_mask64hi(BMBT_EXNTFLAG_BITLEN);
408 }
409
410 /*
411 * Convert in-memory form of btree root to on-disk form.
412 */
413 void
414 xfs_bmbt_to_bmdr(
415 struct xfs_mount *mp,
416 struct xfs_btree_block *rblock,
417 int rblocklen,
418 xfs_bmdr_block_t *dblock,
419 int dblocklen)
420 {
421 int dmxr;
422 xfs_bmbt_key_t *fkp;
423 __be64 *fpp;
424 xfs_bmbt_key_t *tkp;
425 __be64 *tpp;
426
427 ASSERT(rblock->bb_magic == cpu_to_be32(XFS_BMAP_MAGIC));
428 ASSERT(rblock->bb_u.l.bb_leftsib == cpu_to_be64(NULLDFSBNO));
429 ASSERT(rblock->bb_u.l.bb_rightsib == cpu_to_be64(NULLDFSBNO));
430 ASSERT(rblock->bb_level != 0);
431 dblock->bb_level = rblock->bb_level;
432 dblock->bb_numrecs = rblock->bb_numrecs;
433 dmxr = xfs_bmdr_maxrecs(mp, dblocklen, 0);
434 fkp = XFS_BMBT_KEY_ADDR(mp, rblock, 1);
435 tkp = XFS_BMDR_KEY_ADDR(dblock, 1);
436 fpp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, rblocklen);
437 tpp = XFS_BMDR_PTR_ADDR(dblock, 1, dmxr);
438 dmxr = be16_to_cpu(dblock->bb_numrecs);
439 memcpy(tkp, fkp, sizeof(*fkp) * dmxr);
440 memcpy(tpp, fpp, sizeof(*fpp) * dmxr);
441 }
442
443 /*
444 * Check extent records, which have just been read, for
445 * any bit in the extent flag field. ASSERT on debug
446 * kernels, as this condition should not occur.
447 * Return an error condition (1) if any flags found,
448 * otherwise return 0.
449 */
450
451 int
452 xfs_check_nostate_extents(
453 xfs_ifork_t *ifp,
454 xfs_extnum_t idx,
455 xfs_extnum_t num)
456 {
457 for (; num > 0; num--, idx++) {
458 xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, idx);
459 if ((ep->l0 >>
460 (64 - BMBT_EXNTFLAG_BITLEN)) != 0) {
461 ASSERT(0);
462 return 1;
463 }
464 }
465 return 0;
466 }
467
468
469 STATIC struct xfs_btree_cur *
470 xfs_bmbt_dup_cursor(
471 struct xfs_btree_cur *cur)
472 {
473 struct xfs_btree_cur *new;
474
475 new = xfs_bmbt_init_cursor(cur->bc_mp, cur->bc_tp,
476 cur->bc_private.b.ip, cur->bc_private.b.whichfork);
477
478 /*
479 * Copy the firstblock, flist, and flags values,
480 * since init cursor doesn't get them.
481 */
482 new->bc_private.b.firstblock = cur->bc_private.b.firstblock;
483 new->bc_private.b.flist = cur->bc_private.b.flist;
484 new->bc_private.b.flags = cur->bc_private.b.flags;
485
486 return new;
487 }
488
489 STATIC void
490 xfs_bmbt_update_cursor(
491 struct xfs_btree_cur *src,
492 struct xfs_btree_cur *dst)
493 {
494 ASSERT((dst->bc_private.b.firstblock != NULLFSBLOCK) ||
495 (dst->bc_private.b.ip->i_d.di_flags & XFS_DIFLAG_REALTIME));
496 ASSERT(dst->bc_private.b.flist == src->bc_private.b.flist);
497
498 dst->bc_private.b.allocated += src->bc_private.b.allocated;
499 dst->bc_private.b.firstblock = src->bc_private.b.firstblock;
500
501 src->bc_private.b.allocated = 0;
502 }
503
504 STATIC int
505 xfs_bmbt_alloc_block(
506 struct xfs_btree_cur *cur,
507 union xfs_btree_ptr *start,
508 union xfs_btree_ptr *new,
509 int length,
510 int *stat)
511 {
512 xfs_alloc_arg_t args; /* block allocation args */
513 int error; /* error return value */
514
515 memset(&args, 0, sizeof(args));
516 args.tp = cur->bc_tp;
517 args.mp = cur->bc_mp;
518 args.fsbno = cur->bc_private.b.firstblock;
519 args.firstblock = args.fsbno;
520
521 if (args.fsbno == NULLFSBLOCK) {
522 args.fsbno = be64_to_cpu(start->l);
523 args.type = XFS_ALLOCTYPE_START_BNO;
524 /*
525 * Make sure there is sufficient room left in the AG to
526 * complete a full tree split for an extent insert. If
527 * we are converting the middle part of an extent then
528 * we may need space for two tree splits.
529 *
530 * We are relying on the caller to make the correct block
531 * reservation for this operation to succeed. If the
532 * reservation amount is insufficient then we may fail a
533 * block allocation here and corrupt the filesystem.
534 */
535 args.minleft = xfs_trans_get_block_res(args.tp);
536 } else if (cur->bc_private.b.flist->xbf_low) {
537 args.type = XFS_ALLOCTYPE_START_BNO;
538 } else {
539 args.type = XFS_ALLOCTYPE_NEAR_BNO;
540 }
541
542 args.minlen = args.maxlen = args.prod = 1;
543 args.wasdel = cur->bc_private.b.flags & XFS_BTCUR_BPRV_WASDEL;
544 if (!args.wasdel && xfs_trans_get_block_res(args.tp) == 0) {
545 error = XFS_ERROR(ENOSPC);
546 goto error0;
547 }
548 error = xfs_alloc_vextent(&args);
549 if (error)
550 goto error0;
551
552 if (args.fsbno == NULLFSBLOCK && args.minleft) {
553 /*
554 * Could not find an AG with enough free space to satisfy
555 * a full btree split. Try again without minleft and if
556 * successful activate the lowspace algorithm.
557 */
558 args.fsbno = 0;
559 args.type = XFS_ALLOCTYPE_FIRST_AG;
560 args.minleft = 0;
561 error = xfs_alloc_vextent(&args);
562 if (error)
563 goto error0;
564 cur->bc_private.b.flist->xbf_low = 1;
565 }
566 if (args.fsbno == NULLFSBLOCK) {
567 XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
568 *stat = 0;
569 return 0;
570 }
571 ASSERT(args.len == 1);
572 cur->bc_private.b.firstblock = args.fsbno;
573 cur->bc_private.b.allocated++;
574 cur->bc_private.b.ip->i_d.di_nblocks++;
575 xfs_trans_log_inode(args.tp, cur->bc_private.b.ip, XFS_ILOG_CORE);
576 xfs_trans_mod_dquot_byino(args.tp, cur->bc_private.b.ip,
577 XFS_TRANS_DQ_BCOUNT, 1L);
578
579 new->l = cpu_to_be64(args.fsbno);
580
581 XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
582 *stat = 1;
583 return 0;
584
585 error0:
586 XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
587 return error;
588 }
589
590 STATIC int
591 xfs_bmbt_free_block(
592 struct xfs_btree_cur *cur,
593 struct xfs_buf *bp)
594 {
595 struct xfs_mount *mp = cur->bc_mp;
596 struct xfs_inode *ip = cur->bc_private.b.ip;
597 struct xfs_trans *tp = cur->bc_tp;
598 xfs_fsblock_t fsbno = XFS_DADDR_TO_FSB(mp, XFS_BUF_ADDR(bp));
599
600 xfs_bmap_add_free(fsbno, 1, cur->bc_private.b.flist, mp);
601 ip->i_d.di_nblocks--;
602
603 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
604 xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
605 xfs_trans_binval(tp, bp);
606 return 0;
607 }
608
609 STATIC int
610 xfs_bmbt_get_minrecs(
611 struct xfs_btree_cur *cur,
612 int level)
613 {
614 if (level == cur->bc_nlevels - 1) {
615 struct xfs_ifork *ifp;
616
617 ifp = XFS_IFORK_PTR(cur->bc_private.b.ip,
618 cur->bc_private.b.whichfork);
619
620 return xfs_bmbt_maxrecs(cur->bc_mp,
621 ifp->if_broot_bytes, level == 0) / 2;
622 }
623
624 return cur->bc_mp->m_bmap_dmnr[level != 0];
625 }
626
627 int
628 xfs_bmbt_get_maxrecs(
629 struct xfs_btree_cur *cur,
630 int level)
631 {
632 if (level == cur->bc_nlevels - 1) {
633 struct xfs_ifork *ifp;
634
635 ifp = XFS_IFORK_PTR(cur->bc_private.b.ip,
636 cur->bc_private.b.whichfork);
637
638 return xfs_bmbt_maxrecs(cur->bc_mp,
639 ifp->if_broot_bytes, level == 0);
640 }
641
642 return cur->bc_mp->m_bmap_dmxr[level != 0];
643
644 }
645
646 /*
647 * Get the maximum records we could store in the on-disk format.
648 *
649 * For non-root nodes this is equivalent to xfs_bmbt_get_maxrecs, but
650 * for the root node this checks the available space in the dinode fork
651 * so that we can resize the in-memory buffer to match it. After a
652 * resize to the maximum size this function returns the same value
653 * as xfs_bmbt_get_maxrecs for the root node, too.
654 */
655 STATIC int
656 xfs_bmbt_get_dmaxrecs(
657 struct xfs_btree_cur *cur,
658 int level)
659 {
660 if (level != cur->bc_nlevels - 1)
661 return cur->bc_mp->m_bmap_dmxr[level != 0];
662 return xfs_bmdr_maxrecs(cur->bc_mp, cur->bc_private.b.forksize,
663 level == 0);
664 }
665
666 STATIC void
667 xfs_bmbt_init_key_from_rec(
668 union xfs_btree_key *key,
669 union xfs_btree_rec *rec)
670 {
671 key->bmbt.br_startoff =
672 cpu_to_be64(xfs_bmbt_disk_get_startoff(&rec->bmbt));
673 }
674
675 STATIC void
676 xfs_bmbt_init_rec_from_key(
677 union xfs_btree_key *key,
678 union xfs_btree_rec *rec)
679 {
680 ASSERT(key->bmbt.br_startoff != 0);
681
682 xfs_bmbt_disk_set_allf(&rec->bmbt, be64_to_cpu(key->bmbt.br_startoff),
683 0, 0, XFS_EXT_NORM);
684 }
685
686 STATIC void
687 xfs_bmbt_init_rec_from_cur(
688 struct xfs_btree_cur *cur,
689 union xfs_btree_rec *rec)
690 {
691 xfs_bmbt_disk_set_all(&rec->bmbt, &cur->bc_rec.b);
692 }
693
694 STATIC void
695 xfs_bmbt_init_ptr_from_cur(
696 struct xfs_btree_cur *cur,
697 union xfs_btree_ptr *ptr)
698 {
699 ptr->l = 0;
700 }
701
702 STATIC __int64_t
703 xfs_bmbt_key_diff(
704 struct xfs_btree_cur *cur,
705 union xfs_btree_key *key)
706 {
707 return (__int64_t)be64_to_cpu(key->bmbt.br_startoff) -
708 cur->bc_rec.b.br_startoff;
709 }
710
711 #ifdef DEBUG
712 STATIC int
713 xfs_bmbt_keys_inorder(
714 struct xfs_btree_cur *cur,
715 union xfs_btree_key *k1,
716 union xfs_btree_key *k2)
717 {
718 return be64_to_cpu(k1->bmbt.br_startoff) <
719 be64_to_cpu(k2->bmbt.br_startoff);
720 }
721
722 STATIC int
723 xfs_bmbt_recs_inorder(
724 struct xfs_btree_cur *cur,
725 union xfs_btree_rec *r1,
726 union xfs_btree_rec *r2)
727 {
728 return xfs_bmbt_disk_get_startoff(&r1->bmbt) +
729 xfs_bmbt_disk_get_blockcount(&r1->bmbt) <=
730 xfs_bmbt_disk_get_startoff(&r2->bmbt);
731 }
732 #endif /* DEBUG */
733
734 static const struct xfs_btree_ops xfs_bmbt_ops = {
735 .rec_len = sizeof(xfs_bmbt_rec_t),
736 .key_len = sizeof(xfs_bmbt_key_t),
737
738 .dup_cursor = xfs_bmbt_dup_cursor,
739 .update_cursor = xfs_bmbt_update_cursor,
740 .alloc_block = xfs_bmbt_alloc_block,
741 .free_block = xfs_bmbt_free_block,
742 .get_maxrecs = xfs_bmbt_get_maxrecs,
743 .get_minrecs = xfs_bmbt_get_minrecs,
744 .get_dmaxrecs = xfs_bmbt_get_dmaxrecs,
745 .init_key_from_rec = xfs_bmbt_init_key_from_rec,
746 .init_rec_from_key = xfs_bmbt_init_rec_from_key,
747 .init_rec_from_cur = xfs_bmbt_init_rec_from_cur,
748 .init_ptr_from_cur = xfs_bmbt_init_ptr_from_cur,
749 .key_diff = xfs_bmbt_key_diff,
750 #ifdef DEBUG
751 .keys_inorder = xfs_bmbt_keys_inorder,
752 .recs_inorder = xfs_bmbt_recs_inorder,
753 #endif
754 };
755
756 /*
757 * Allocate a new bmap btree cursor.
758 */
759 struct xfs_btree_cur * /* new bmap btree cursor */
760 xfs_bmbt_init_cursor(
761 struct xfs_mount *mp, /* file system mount point */
762 struct xfs_trans *tp, /* transaction pointer */
763 struct xfs_inode *ip, /* inode owning the btree */
764 int whichfork) /* data or attr fork */
765 {
766 struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
767 struct xfs_btree_cur *cur;
768
769 cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_SLEEP);
770
771 cur->bc_tp = tp;
772 cur->bc_mp = mp;
773 cur->bc_nlevels = be16_to_cpu(ifp->if_broot->bb_level) + 1;
774 cur->bc_btnum = XFS_BTNUM_BMAP;
775 cur->bc_blocklog = mp->m_sb.sb_blocklog;
776
777 cur->bc_ops = &xfs_bmbt_ops;
778 cur->bc_flags = XFS_BTREE_LONG_PTRS | XFS_BTREE_ROOT_IN_INODE;
779
780 cur->bc_private.b.forksize = XFS_IFORK_SIZE(ip, whichfork);
781 cur->bc_private.b.ip = ip;
782 cur->bc_private.b.firstblock = NULLFSBLOCK;
783 cur->bc_private.b.flist = NULL;
784 cur->bc_private.b.allocated = 0;
785 cur->bc_private.b.flags = 0;
786 cur->bc_private.b.whichfork = whichfork;
787
788 return cur;
789 }
790
791 /*
792 * Calculate number of records in a bmap btree block.
793 */
794 int
795 xfs_bmbt_maxrecs(
796 struct xfs_mount *mp,
797 int blocklen,
798 int leaf)
799 {
800 blocklen -= XFS_BMBT_BLOCK_LEN(mp);
801
802 if (leaf)
803 return blocklen / sizeof(xfs_bmbt_rec_t);
804 return blocklen / (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t));
805 }
806
807 /*
808 * Calculate number of records in a bmap btree inode root.
809 */
810 int
811 xfs_bmdr_maxrecs(
812 struct xfs_mount *mp,
813 int blocklen,
814 int leaf)
815 {
816 blocklen -= sizeof(xfs_bmdr_block_t);
817
818 if (leaf)
819 return blocklen / sizeof(xfs_bmdr_rec_t);
820 return blocklen / (sizeof(xfs_bmdr_key_t) + sizeof(xfs_bmdr_ptr_t));
821 }
kernel-based virtual machine