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[BLOCK] ll_rw_blk: make max_sectors and max_hw_sectors unsigned ints
[linux-2.6/openmoko-kernel/knife-kernel.git] / fs / xfs / xfs_rtalloc.c
blob06fc061c50fc99d1b6ef71685e53bd334aa76281
1 /*
2 * Copyright (c) 2000-2005 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_dir.h"
28 #include "xfs_dir2.h"
29 #include "xfs_dmapi.h"
30 #include "xfs_mount.h"
31 #include "xfs_bmap_btree.h"
32 #include "xfs_alloc_btree.h"
33 #include "xfs_ialloc_btree.h"
34 #include "xfs_dir_sf.h"
35 #include "xfs_dir2_sf.h"
36 #include "xfs_attr_sf.h"
37 #include "xfs_dinode.h"
38 #include "xfs_inode.h"
39 #include "xfs_btree.h"
40 #include "xfs_ialloc.h"
41 #include "xfs_alloc.h"
42 #include "xfs_bmap.h"
43 #include "xfs_rtalloc.h"
44 #include "xfs_fsops.h"
45 #include "xfs_error.h"
46 #include "xfs_rw.h"
47 #include "xfs_inode_item.h"
48 #include "xfs_trans_space.h"
49
50
51 /*
52 * Prototypes for internal functions.
53 */
54
55
56 STATIC int xfs_rtallocate_range(xfs_mount_t *, xfs_trans_t *, xfs_rtblock_t,
57 xfs_extlen_t, xfs_buf_t **, xfs_fsblock_t *);
58 STATIC int xfs_rtany_summary(xfs_mount_t *, xfs_trans_t *, int, int,
59 xfs_rtblock_t, xfs_buf_t **, xfs_fsblock_t *, int *);
60 STATIC int xfs_rtcheck_range(xfs_mount_t *, xfs_trans_t *, xfs_rtblock_t,
61 xfs_extlen_t, int, xfs_rtblock_t *, int *);
62 STATIC int xfs_rtfind_back(xfs_mount_t *, xfs_trans_t *, xfs_rtblock_t,
63 xfs_rtblock_t, xfs_rtblock_t *);
64 STATIC int xfs_rtfind_forw(xfs_mount_t *, xfs_trans_t *, xfs_rtblock_t,
65 xfs_rtblock_t, xfs_rtblock_t *);
66 STATIC int xfs_rtget_summary( xfs_mount_t *, xfs_trans_t *, int,
67 xfs_rtblock_t, xfs_buf_t **, xfs_fsblock_t *, xfs_suminfo_t *);
68 STATIC int xfs_rtmodify_range(xfs_mount_t *, xfs_trans_t *, xfs_rtblock_t,
69 xfs_extlen_t, int);
70 STATIC int xfs_rtmodify_summary(xfs_mount_t *, xfs_trans_t *, int,
71 xfs_rtblock_t, int, xfs_buf_t **, xfs_fsblock_t *);
72
73 /*
74 * Internal functions.
75 */
76
77 /*
78 * xfs_lowbit32: get low bit set out of 32-bit argument, -1 if none set.
79 */
80 STATIC int
81 xfs_lowbit32(
82 __uint32_t v)
83 {
84 if (v)
85 return ffs(v) - 1;
86 return -1;
87 }
88
89 /*
90 * Allocate space to the bitmap or summary file, and zero it, for growfs.
91 */
92 STATIC int /* error */
93 xfs_growfs_rt_alloc(
94 xfs_mount_t *mp, /* file system mount point */
95 xfs_extlen_t oblocks, /* old count of blocks */
96 xfs_extlen_t nblocks, /* new count of blocks */
97 xfs_ino_t ino) /* inode number (bitmap/summary) */
98 {
99 xfs_fileoff_t bno; /* block number in file */
100 xfs_buf_t *bp; /* temporary buffer for zeroing */
101 int cancelflags; /* flags for xfs_trans_cancel */
102 int committed; /* transaction committed flag */
103 xfs_daddr_t d; /* disk block address */
104 int error; /* error return value */
105 xfs_fsblock_t firstblock; /* first block allocated in xaction */
106 xfs_bmap_free_t flist; /* list of freed blocks */
107 xfs_fsblock_t fsbno; /* filesystem block for bno */
108 xfs_inode_t *ip; /* pointer to incore inode */
109 xfs_bmbt_irec_t map; /* block map output */
110 int nmap; /* number of block maps */
111 int resblks; /* space reservation */
112 xfs_trans_t *tp; /* transaction pointer */
113
114 /*
115 * Allocate space to the file, as necessary.
116 */
117 while (oblocks < nblocks) {
118 tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFSRT_ALLOC);
119 resblks = XFS_GROWFSRT_SPACE_RES(mp, nblocks - oblocks);
120 cancelflags = 0;
121 /*
122 * Reserve space & log for one extent added to the file.
123 */
124 if ((error = xfs_trans_reserve(tp, resblks,
125 XFS_GROWRTALLOC_LOG_RES(mp), 0,
126 XFS_TRANS_PERM_LOG_RES,
127 XFS_DEFAULT_PERM_LOG_COUNT)))
128 goto error_exit;
129 cancelflags = XFS_TRANS_RELEASE_LOG_RES;
130 /*
131 * Lock the inode.
132 */
133 if ((error = xfs_trans_iget(mp, tp, ino, 0, XFS_ILOCK_EXCL, &ip)))
134 goto error_exit;
135 XFS_BMAP_INIT(&flist, &firstblock);
136 /*
137 * Allocate blocks to the bitmap file.
138 */
139 nmap = 1;
140 cancelflags |= XFS_TRANS_ABORT;
141 error = xfs_bmapi(tp, ip, oblocks, nblocks - oblocks,
142 XFS_BMAPI_WRITE | XFS_BMAPI_METADATA, &firstblock,
143 resblks, &map, &nmap, &flist);
144 if (!error && nmap < 1)
145 error = XFS_ERROR(ENOSPC);
146 if (error)
147 goto error_exit;
148 /*
149 * Free any blocks freed up in the transaction, then commit.
150 */
151 error = xfs_bmap_finish(&tp, &flist, firstblock, &committed);
152 if (error)
153 goto error_exit;
154 xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL);
155 /*
156 * Now we need to clear the allocated blocks.
157 * Do this one block per transaction, to keep it simple.
158 */
159 cancelflags = 0;
160 for (bno = map.br_startoff, fsbno = map.br_startblock;
161 bno < map.br_startoff + map.br_blockcount;
162 bno++, fsbno++) {
163 tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFSRT_ZERO);
164 /*
165 * Reserve log for one block zeroing.
166 */
167 if ((error = xfs_trans_reserve(tp, 0,
168 XFS_GROWRTZERO_LOG_RES(mp), 0, 0, 0)))
169 goto error_exit;
170 /*
171 * Lock the bitmap inode.
172 */
173 if ((error = xfs_trans_iget(mp, tp, ino, 0, XFS_ILOCK_EXCL,
174 &ip)))
175 goto error_exit;
176 /*
177 * Get a buffer for the block.
178 */
179 d = XFS_FSB_TO_DADDR(mp, fsbno);
180 bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, d,
181 mp->m_bsize, 0);
182 if (bp == NULL) {
183 error = XFS_ERROR(EIO);
184 goto error_exit;
185 }
186 memset(XFS_BUF_PTR(bp), 0, mp->m_sb.sb_blocksize);
187 xfs_trans_log_buf(tp, bp, 0, mp->m_sb.sb_blocksize - 1);
188 /*
189 * Commit the transaction.
190 */
191 xfs_trans_commit(tp, 0, NULL);
192 }
193 /*
194 * Go on to the next extent, if any.
195 */
196 oblocks = map.br_startoff + map.br_blockcount;
197 }
198 return 0;
199 error_exit:
200 xfs_trans_cancel(tp, cancelflags);
201 return error;
202 }
203
204 /*
205 * Attempt to allocate an extent minlen<=len<=maxlen starting from
206 * bitmap block bbno. If we don't get maxlen then use prod to trim
207 * the length, if given. Returns error; returns starting block in *rtblock.
208 * The lengths are all in rtextents.
209 */
210 STATIC int /* error */
211 xfs_rtallocate_extent_block(
212 xfs_mount_t *mp, /* file system mount point */
213 xfs_trans_t *tp, /* transaction pointer */
214 xfs_rtblock_t bbno, /* bitmap block number */
215 xfs_extlen_t minlen, /* minimum length to allocate */
216 xfs_extlen_t maxlen, /* maximum length to allocate */
217 xfs_extlen_t *len, /* out: actual length allocated */
218 xfs_rtblock_t *nextp, /* out: next block to try */
219 xfs_buf_t **rbpp, /* in/out: summary block buffer */
220 xfs_fsblock_t *rsb, /* in/out: summary block number */
221 xfs_extlen_t prod, /* extent product factor */
222 xfs_rtblock_t *rtblock) /* out: start block allocated */
223 {
224 xfs_rtblock_t besti; /* best rtblock found so far */
225 xfs_rtblock_t bestlen; /* best length found so far */
226 xfs_rtblock_t end; /* last rtblock in chunk */
227 int error; /* error value */
228 xfs_rtblock_t i; /* current rtblock trying */
229 xfs_rtblock_t next; /* next rtblock to try */
230 int stat; /* status from internal calls */
231
232 /*
233 * Loop over all the extents starting in this bitmap block,
234 * looking for one that's long enough.
235 */
236 for (i = XFS_BLOCKTOBIT(mp, bbno), besti = -1, bestlen = 0,
237 end = XFS_BLOCKTOBIT(mp, bbno + 1) - 1;
238 i <= end;
239 i++) {
240 /*
241 * See if there's a free extent of maxlen starting at i.
242 * If it's not so then next will contain the first non-free.
243 */
244 error = xfs_rtcheck_range(mp, tp, i, maxlen, 1, &next, &stat);
245 if (error) {
246 return error;
247 }
248 if (stat) {
249 /*
250 * i for maxlen is all free, allocate and return that.
251 */
252 error = xfs_rtallocate_range(mp, tp, i, maxlen, rbpp,
253 rsb);
254 if (error) {
255 return error;
256 }
257 *len = maxlen;
258 *rtblock = i;
259 return 0;
260 }
261 /*
262 * In the case where we have a variable-sized allocation
263 * request, figure out how big this free piece is,
264 * and if it's big enough for the minimum, and the best
265 * so far, remember it.
266 */
267 if (minlen < maxlen) {
268 xfs_rtblock_t thislen; /* this extent size */
269
270 thislen = next - i;
271 if (thislen >= minlen && thislen > bestlen) {
272 besti = i;
273 bestlen = thislen;
274 }
275 }
276 /*
277 * If not done yet, find the start of the next free space.
278 */
279 if (next < end) {
280 error = xfs_rtfind_forw(mp, tp, next, end, &i);
281 if (error) {
282 return error;
283 }
284 } else
285 break;
286 }
287 /*
288 * Searched the whole thing & didn't find a maxlen free extent.
289 */
290 if (minlen < maxlen && besti != -1) {
291 xfs_extlen_t p; /* amount to trim length by */
292
293 /*
294 * If size should be a multiple of prod, make that so.
295 */
296 if (prod > 1 && (p = do_mod(bestlen, prod)))
297 bestlen -= p;
298 /*
299 * Allocate besti for bestlen & return that.
300 */
301 error = xfs_rtallocate_range(mp, tp, besti, bestlen, rbpp, rsb);
302 if (error) {
303 return error;
304 }
305 *len = bestlen;
306 *rtblock = besti;
307 return 0;
308 }
309 /*
310 * Allocation failed. Set *nextp to the next block to try.
311 */
312 *nextp = next;
313 *rtblock = NULLRTBLOCK;
314 return 0;
315 }
316
317 /*
318 * Allocate an extent of length minlen<=len<=maxlen, starting at block
319 * bno. If we don't get maxlen then use prod to trim the length, if given.
320 * Returns error; returns starting block in *rtblock.
321 * The lengths are all in rtextents.
322 */
323 STATIC int /* error */
324 xfs_rtallocate_extent_exact(
325 xfs_mount_t *mp, /* file system mount point */
326 xfs_trans_t *tp, /* transaction pointer */
327 xfs_rtblock_t bno, /* starting block number to allocate */
328 xfs_extlen_t minlen, /* minimum length to allocate */
329 xfs_extlen_t maxlen, /* maximum length to allocate */
330 xfs_extlen_t *len, /* out: actual length allocated */
331 xfs_buf_t **rbpp, /* in/out: summary block buffer */
332 xfs_fsblock_t *rsb, /* in/out: summary block number */
333 xfs_extlen_t prod, /* extent product factor */
334 xfs_rtblock_t *rtblock) /* out: start block allocated */
335 {
336 int error; /* error value */
337 xfs_extlen_t i; /* extent length trimmed due to prod */
338 int isfree; /* extent is free */
339 xfs_rtblock_t next; /* next block to try (dummy) */
340
341 ASSERT(minlen % prod == 0 && maxlen % prod == 0);
342 /*
343 * Check if the range in question (for maxlen) is free.
344 */
345 error = xfs_rtcheck_range(mp, tp, bno, maxlen, 1, &next, &isfree);
346 if (error) {
347 return error;
348 }
349 if (isfree) {
350 /*
351 * If it is, allocate it and return success.
352 */
353 error = xfs_rtallocate_range(mp, tp, bno, maxlen, rbpp, rsb);
354 if (error) {
355 return error;
356 }
357 *len = maxlen;
358 *rtblock = bno;
359 return 0;
360 }
361 /*
362 * If not, allocate what there is, if it's at least minlen.
363 */
364 maxlen = next - bno;
365 if (maxlen < minlen) {
366 /*
367 * Failed, return failure status.
368 */
369 *rtblock = NULLRTBLOCK;
370 return 0;
371 }
372 /*
373 * Trim off tail of extent, if prod is specified.
374 */
375 if (prod > 1 && (i = maxlen % prod)) {
376 maxlen -= i;
377 if (maxlen < minlen) {
378 /*
379 * Now we can't do it, return failure status.
380 */
381 *rtblock = NULLRTBLOCK;
382 return 0;
383 }
384 }
385 /*
386 * Allocate what we can and return it.
387 */
388 error = xfs_rtallocate_range(mp, tp, bno, maxlen, rbpp, rsb);
389 if (error) {
390 return error;
391 }
392 *len = maxlen;
393 *rtblock = bno;
394 return 0;
395 }
396
397 /*
398 * Allocate an extent of length minlen<=len<=maxlen, starting as near
399 * to bno as possible. If we don't get maxlen then use prod to trim
400 * the length, if given. The lengths are all in rtextents.
401 */
402 STATIC int /* error */
403 xfs_rtallocate_extent_near(
404 xfs_mount_t *mp, /* file system mount point */
405 xfs_trans_t *tp, /* transaction pointer */
406 xfs_rtblock_t bno, /* starting block number to allocate */
407 xfs_extlen_t minlen, /* minimum length to allocate */
408 xfs_extlen_t maxlen, /* maximum length to allocate */
409 xfs_extlen_t *len, /* out: actual length allocated */
410 xfs_buf_t **rbpp, /* in/out: summary block buffer */
411 xfs_fsblock_t *rsb, /* in/out: summary block number */
412 xfs_extlen_t prod, /* extent product factor */
413 xfs_rtblock_t *rtblock) /* out: start block allocated */
414 {
415 int any; /* any useful extents from summary */
416 xfs_rtblock_t bbno; /* bitmap block number */
417 int error; /* error value */
418 int i; /* bitmap block offset (loop control) */
419 int j; /* secondary loop control */
420 int log2len; /* log2 of minlen */
421 xfs_rtblock_t n; /* next block to try */
422 xfs_rtblock_t r; /* result block */
423
424 ASSERT(minlen % prod == 0 && maxlen % prod == 0);
425 /*
426 * If the block number given is off the end, silently set it to
427 * the last block.
428 */
429 if (bno >= mp->m_sb.sb_rextents)
430 bno = mp->m_sb.sb_rextents - 1;
431 /*
432 * Try the exact allocation first.
433 */
434 error = xfs_rtallocate_extent_exact(mp, tp, bno, minlen, maxlen, len,
435 rbpp, rsb, prod, &r);
436 if (error) {
437 return error;
438 }
439 /*
440 * If the exact allocation worked, return that.
441 */
442 if (r != NULLRTBLOCK) {
443 *rtblock = r;
444 return 0;
445 }
446 bbno = XFS_BITTOBLOCK(mp, bno);
447 i = 0;
448 log2len = xfs_highbit32(minlen);
449 /*
450 * Loop over all bitmap blocks (bbno + i is current block).
451 */
452 for (;;) {
453 /*
454 * Get summary information of extents of all useful levels
455 * starting in this bitmap block.
456 */
457 error = xfs_rtany_summary(mp, tp, log2len, mp->m_rsumlevels - 1,
458 bbno + i, rbpp, rsb, &any);
459 if (error) {
460 return error;
461 }
462 /*
463 * If there are any useful extents starting here, try
464 * allocating one.
465 */
466 if (any) {
467 /*
468 * On the positive side of the starting location.
469 */
470 if (i >= 0) {
471 /*
472 * Try to allocate an extent starting in
473 * this block.
474 */
475 error = xfs_rtallocate_extent_block(mp, tp,
476 bbno + i, minlen, maxlen, len, &n, rbpp,
477 rsb, prod, &r);
478 if (error) {
479 return error;
480 }
481 /*
482 * If it worked, return it.
483 */
484 if (r != NULLRTBLOCK) {
485 *rtblock = r;
486 return 0;
487 }
488 }
489 /*
490 * On the negative side of the starting location.
491 */
492 else { /* i < 0 */
493 /*
494 * Loop backwards through the bitmap blocks from
495 * the starting point-1 up to where we are now.
496 * There should be an extent which ends in this
497 * bitmap block and is long enough.
498 */
499 for (j = -1; j > i; j--) {
500 /*
501 * Grab the summary information for
502 * this bitmap block.
503 */
504 error = xfs_rtany_summary(mp, tp,
505 log2len, mp->m_rsumlevels - 1,
506 bbno + j, rbpp, rsb, &any);
507 if (error) {
508 return error;
509 }
510 /*
511 * If there's no extent given in the
512 * summary that means the extent we
513 * found must carry over from an
514 * earlier block. If there is an
515 * extent given, we've already tried
516 * that allocation, don't do it again.
517 */
518 if (any)
519 continue;
520 error = xfs_rtallocate_extent_block(mp,
521 tp, bbno + j, minlen, maxlen,
522 len, &n, rbpp, rsb, prod, &r);
523 if (error) {
524 return error;
525 }
526 /*
527 * If it works, return the extent.
528 */
529 if (r != NULLRTBLOCK) {
530 *rtblock = r;
531 return 0;
532 }
533 }
534 /*
535 * There weren't intervening bitmap blocks
536 * with a long enough extent, or the
537 * allocation didn't work for some reason
538 * (i.e. it's a little * too short).
539 * Try to allocate from the summary block
540 * that we found.
541 */
542 error = xfs_rtallocate_extent_block(mp, tp,
543 bbno + i, minlen, maxlen, len, &n, rbpp,
544 rsb, prod, &r);
545 if (error) {
546 return error;
547 }
548 /*
549 * If it works, return the extent.
550 */
551 if (r != NULLRTBLOCK) {
552 *rtblock = r;
553 return 0;
554 }
555 }
556 }
557 /*
558 * Loop control. If we were on the positive side, and there's
559 * still more blocks on the negative side, go there.
560 */
561 if (i > 0 && (int)bbno - i >= 0)
562 i = -i;
563 /*
564 * If positive, and no more negative, but there are more
565 * positive, go there.
566 */
567 else if (i > 0 && (int)bbno + i < mp->m_sb.sb_rbmblocks - 1)
568 i++;
569 /*
570 * If negative or 0 (just started), and there are positive
571 * blocks to go, go there. The 0 case moves to block 1.
572 */
573 else if (i <= 0 && (int)bbno - i < mp->m_sb.sb_rbmblocks - 1)
574 i = 1 - i;
575 /*
576 * If negative or 0 and there are more negative blocks,
577 * go there.
578 */
579 else if (i <= 0 && (int)bbno + i > 0)
580 i--;
581 /*
582 * Must be done. Return failure.
583 */
584 else
585 break;
586 }
587 *rtblock = NULLRTBLOCK;
588 return 0;
589 }
590
591 /*
592 * Allocate an extent of length minlen<=len<=maxlen, with no position
593 * specified. If we don't get maxlen then use prod to trim
594 * the length, if given. The lengths are all in rtextents.
595 */
596 STATIC int /* error */
597 xfs_rtallocate_extent_size(
598 xfs_mount_t *mp, /* file system mount point */
599 xfs_trans_t *tp, /* transaction pointer */
600 xfs_extlen_t minlen, /* minimum length to allocate */
601 xfs_extlen_t maxlen, /* maximum length to allocate */
602 xfs_extlen_t *len, /* out: actual length allocated */
603 xfs_buf_t **rbpp, /* in/out: summary block buffer */
604 xfs_fsblock_t *rsb, /* in/out: summary block number */
605 xfs_extlen_t prod, /* extent product factor */
606 xfs_rtblock_t *rtblock) /* out: start block allocated */
607 {
608 int error; /* error value */
609 int i; /* bitmap block number */
610 int l; /* level number (loop control) */
611 xfs_rtblock_t n; /* next block to be tried */
612 xfs_rtblock_t r; /* result block number */
613 xfs_suminfo_t sum; /* summary information for extents */
614
615 ASSERT(minlen % prod == 0 && maxlen % prod == 0);
616 /*
617 * Loop over all the levels starting with maxlen.
618 * At each level, look at all the bitmap blocks, to see if there
619 * are extents starting there that are long enough (>= maxlen).
620 * Note, only on the initial level can the allocation fail if
621 * the summary says there's an extent.
622 */
623 for (l = xfs_highbit32(maxlen); l < mp->m_rsumlevels; l++) {
624 /*
625 * Loop over all the bitmap blocks.
626 */
627 for (i = 0; i < mp->m_sb.sb_rbmblocks; i++) {
628 /*
629 * Get the summary for this level/block.
630 */
631 error = xfs_rtget_summary(mp, tp, l, i, rbpp, rsb,
632 &sum);
633 if (error) {
634 return error;
635 }
636 /*
637 * Nothing there, on to the next block.
638 */
639 if (!sum)
640 continue;
641 /*
642 * Try allocating the extent.
643 */
644 error = xfs_rtallocate_extent_block(mp, tp, i, maxlen,
645 maxlen, len, &n, rbpp, rsb, prod, &r);
646 if (error) {
647 return error;
648 }
649 /*
650 * If it worked, return that.
651 */
652 if (r != NULLRTBLOCK) {
653 *rtblock = r;
654 return 0;
655 }
656 /*
657 * If the "next block to try" returned from the
658 * allocator is beyond the next bitmap block,
659 * skip to that bitmap block.
660 */
661 if (XFS_BITTOBLOCK(mp, n) > i + 1)
662 i = XFS_BITTOBLOCK(mp, n) - 1;
663 }
664 }
665 /*
666 * Didn't find any maxlen blocks. Try smaller ones, unless
667 * we're asking for a fixed size extent.
668 */
669 if (minlen > --maxlen) {
670 *rtblock = NULLRTBLOCK;
671 return 0;
672 }
673 /*
674 * Loop over sizes, from maxlen down to minlen.
675 * This time, when we do the allocations, allow smaller ones
676 * to succeed.
677 */
678 for (l = xfs_highbit32(maxlen); l >= xfs_highbit32(minlen); l--) {
679 /*
680 * Loop over all the bitmap blocks, try an allocation
681 * starting in that block.
682 */
683 for (i = 0; i < mp->m_sb.sb_rbmblocks; i++) {
684 /*
685 * Get the summary information for this level/block.
686 */
687 error = xfs_rtget_summary(mp, tp, l, i, rbpp, rsb,
688 &sum);
689 if (error) {
690 return error;
691 }
692 /*
693 * If nothing there, go on to next.
694 */
695 if (!sum)
696 continue;
697 /*
698 * Try the allocation. Make sure the specified
699 * minlen/maxlen are in the possible range for
700 * this summary level.
701 */
702 error = xfs_rtallocate_extent_block(mp, tp, i,
703 XFS_RTMAX(minlen, 1 << l),
704 XFS_RTMIN(maxlen, (1 << (l + 1)) - 1),
705 len, &n, rbpp, rsb, prod, &r);
706 if (error) {
707 return error;
708 }
709 /*
710 * If it worked, return that extent.
711 */
712 if (r != NULLRTBLOCK) {
713 *rtblock = r;
714 return 0;
715 }
716 /*
717 * If the "next block to try" returned from the
718 * allocator is beyond the next bitmap block,
719 * skip to that bitmap block.
720 */
721 if (XFS_BITTOBLOCK(mp, n) > i + 1)
722 i = XFS_BITTOBLOCK(mp, n) - 1;
723 }
724 }
725 /*
726 * Got nothing, return failure.
727 */
728 *rtblock = NULLRTBLOCK;
729 return 0;
730 }
731
732 /*
733 * Mark an extent specified by start and len allocated.
734 * Updates all the summary information as well as the bitmap.
735 */
736 STATIC int /* error */
737 xfs_rtallocate_range(
738 xfs_mount_t *mp, /* file system mount point */
739 xfs_trans_t *tp, /* transaction pointer */
740 xfs_rtblock_t start, /* start block to allocate */
741 xfs_extlen_t len, /* length to allocate */
742 xfs_buf_t **rbpp, /* in/out: summary block buffer */
743 xfs_fsblock_t *rsb) /* in/out: summary block number */
744 {
745 xfs_rtblock_t end; /* end of the allocated extent */
746 int error; /* error value */
747 xfs_rtblock_t postblock; /* first block allocated > end */
748 xfs_rtblock_t preblock; /* first block allocated < start */
749
750 end = start + len - 1;
751 /*
752 * Assume we're allocating out of the middle of a free extent.
753 * We need to find the beginning and end of the extent so we can
754 * properly update the summary.
755 */
756 error = xfs_rtfind_back(mp, tp, start, 0, &preblock);
757 if (error) {
758 return error;
759 }
760 /*
761 * Find the next allocated block (end of free extent).
762 */
763 error = xfs_rtfind_forw(mp, tp, end, mp->m_sb.sb_rextents - 1,
764 &postblock);
765 if (error) {
766 return error;
767 }
768 /*
769 * Decrement the summary information corresponding to the entire
770 * (old) free extent.
771 */
772 error = xfs_rtmodify_summary(mp, tp,
773 XFS_RTBLOCKLOG(postblock + 1 - preblock),
774 XFS_BITTOBLOCK(mp, preblock), -1, rbpp, rsb);
775 if (error) {
776 return error;
777 }
778 /*
779 * If there are blocks not being allocated at the front of the
780 * old extent, add summary data for them to be free.
781 */
782 if (preblock < start) {
783 error = xfs_rtmodify_summary(mp, tp,
784 XFS_RTBLOCKLOG(start - preblock),
785 XFS_BITTOBLOCK(mp, preblock), 1, rbpp, rsb);
786 if (error) {
787 return error;
788 }
789 }
790 /*
791 * If there are blocks not being allocated at the end of the
792 * old extent, add summary data for them to be free.
793 */
794 if (postblock > end) {
795 error = xfs_rtmodify_summary(mp, tp,
796 XFS_RTBLOCKLOG(postblock - end),
797 XFS_BITTOBLOCK(mp, end + 1), 1, rbpp, rsb);
798 if (error) {
799 return error;
800 }
801 }
802 /*
803 * Modify the bitmap to mark this extent allocated.
804 */
805 error = xfs_rtmodify_range(mp, tp, start, len, 0);
806 return error;
807 }
808
809 /*
810 * Return whether there are any free extents in the size range given
811 * by low and high, for the bitmap block bbno.
812 */
813 STATIC int /* error */
814 xfs_rtany_summary(
815 xfs_mount_t *mp, /* file system mount structure */
816 xfs_trans_t *tp, /* transaction pointer */
817 int low, /* low log2 extent size */
818 int high, /* high log2 extent size */
819 xfs_rtblock_t bbno, /* bitmap block number */
820 xfs_buf_t **rbpp, /* in/out: summary block buffer */
821 xfs_fsblock_t *rsb, /* in/out: summary block number */
822 int *stat) /* out: any good extents here? */
823 {
824 int error; /* error value */
825 int log; /* loop counter, log2 of ext. size */
826 xfs_suminfo_t sum; /* summary data */
827
828 /*
829 * Loop over logs of extent sizes. Order is irrelevant.
830 */
831 for (log = low; log <= high; log++) {
832 /*
833 * Get one summary datum.
834 */
835 error = xfs_rtget_summary(mp, tp, log, bbno, rbpp, rsb, &sum);
836 if (error) {
837 return error;
838 }
839 /*
840 * If there are any, return success.
841 */
842 if (sum) {
843 *stat = 1;
844 return 0;
845 }
846 }
847 /*
848 * Found nothing, return failure.
849 */
850 *stat = 0;
851 return 0;
852 }
853
854 /*
855 * Get a buffer for the bitmap or summary file block specified.
856 * The buffer is returned read and locked.
857 */
858 STATIC int /* error */
859 xfs_rtbuf_get(
860 xfs_mount_t *mp, /* file system mount structure */
861 xfs_trans_t *tp, /* transaction pointer */
862 xfs_rtblock_t block, /* block number in bitmap or summary */
863 int issum, /* is summary not bitmap */
864 xfs_buf_t **bpp) /* output: buffer for the block */
865 {
866 xfs_buf_t *bp; /* block buffer, result */
867 xfs_daddr_t d; /* disk addr of block */
868 int error; /* error value */
869 xfs_fsblock_t fsb; /* fs block number for block */
870 xfs_inode_t *ip; /* bitmap or summary inode */
871
872 ip = issum ? mp->m_rsumip : mp->m_rbmip;
873 /*
874 * Map from the file offset (block) and inode number to the
875 * file system block.
876 */
877 error = xfs_bmapi_single(tp, ip, XFS_DATA_FORK, &fsb, block);
878 if (error) {
879 return error;
880 }
881 ASSERT(fsb != NULLFSBLOCK);
882 /*
883 * Convert to disk address for buffer cache.
884 */
885 d = XFS_FSB_TO_DADDR(mp, fsb);
886 /*
887 * Read the buffer.
888 */
889 error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp, d,
890 mp->m_bsize, 0, &bp);
891 if (error) {
892 return error;
893 }
894 ASSERT(bp && !XFS_BUF_GETERROR(bp));
895 *bpp = bp;
896 return 0;
897 }
898
899 #ifdef DEBUG
900 /*
901 * Check that the given extent (block range) is allocated already.
902 */
903 STATIC int /* error */
904 xfs_rtcheck_alloc_range(
905 xfs_mount_t *mp, /* file system mount point */
906 xfs_trans_t *tp, /* transaction pointer */
907 xfs_rtblock_t bno, /* starting block number of extent */
908 xfs_extlen_t len, /* length of extent */
909 int *stat) /* out: 1 for allocated, 0 for not */
910 {
911 xfs_rtblock_t new; /* dummy for xfs_rtcheck_range */
912
913 return xfs_rtcheck_range(mp, tp, bno, len, 0, &new, stat);
914 }
915 #endif
916
917 #ifdef DEBUG
918 /*
919 * Check whether the given block in the bitmap has the given value.
920 */
921 STATIC int /* 1 for matches, 0 for not */
922 xfs_rtcheck_bit(
923 xfs_mount_t *mp, /* file system mount structure */
924 xfs_trans_t *tp, /* transaction pointer */
925 xfs_rtblock_t start, /* bit (block) to check */
926 int val) /* 1 for free, 0 for allocated */
927 {
928 int bit; /* bit number in the word */
929 xfs_rtblock_t block; /* bitmap block number */
930 xfs_buf_t *bp; /* buf for the block */
931 xfs_rtword_t *bufp; /* pointer into the buffer */
932 /* REFERENCED */
933 int error; /* error value */
934 xfs_rtword_t wdiff; /* difference between bit & expected */
935 int word; /* word number in the buffer */
936 xfs_rtword_t wval; /* word value from buffer */
937
938 block = XFS_BITTOBLOCK(mp, start);
939 error = xfs_rtbuf_get(mp, tp, block, 0, &bp);
940 bufp = (xfs_rtword_t *)XFS_BUF_PTR(bp);
941 word = XFS_BITTOWORD(mp, start);
942 bit = (int)(start & (XFS_NBWORD - 1));
943 wval = bufp[word];
944 xfs_trans_brelse(tp, bp);
945 wdiff = (wval ^ -val) & ((xfs_rtword_t)1 << bit);
946 return !wdiff;
947 }
948 #endif /* DEBUG */
949
950 #if 0
951 /*
952 * Check that the given extent (block range) is free already.
953 */
954 STATIC int /* error */
955 xfs_rtcheck_free_range(
956 xfs_mount_t *mp, /* file system mount point */
957 xfs_trans_t *tp, /* transaction pointer */
958 xfs_rtblock_t bno, /* starting block number of extent */
959 xfs_extlen_t len, /* length of extent */
960 int *stat) /* out: 1 for free, 0 for not */
961 {
962 xfs_rtblock_t new; /* dummy for xfs_rtcheck_range */
963
964 return xfs_rtcheck_range(mp, tp, bno, len, 1, &new, stat);
965 }
966 #endif
967
968 /*
969 * Check that the given range is either all allocated (val = 0) or
970 * all free (val = 1).
971 */
972 STATIC int /* error */
973 xfs_rtcheck_range(
974 xfs_mount_t *mp, /* file system mount point */
975 xfs_trans_t *tp, /* transaction pointer */
976 xfs_rtblock_t start, /* starting block number of extent */
977 xfs_extlen_t len, /* length of extent */
978 int val, /* 1 for free, 0 for allocated */
979 xfs_rtblock_t *new, /* out: first block not matching */
980 int *stat) /* out: 1 for matches, 0 for not */
981 {
982 xfs_rtword_t *b; /* current word in buffer */
983 int bit; /* bit number in the word */
984 xfs_rtblock_t block; /* bitmap block number */
985 xfs_buf_t *bp; /* buf for the block */
986 xfs_rtword_t *bufp; /* starting word in buffer */
987 int error; /* error value */
988 xfs_rtblock_t i; /* current bit number rel. to start */
989 xfs_rtblock_t lastbit; /* last useful bit in word */
990 xfs_rtword_t mask; /* mask of relevant bits for value */
991 xfs_rtword_t wdiff; /* difference from wanted value */
992 int word; /* word number in the buffer */
993
994 /*
995 * Compute starting bitmap block number
996 */
997 block = XFS_BITTOBLOCK(mp, start);
998 /*
999 * Read the bitmap block.
1000 */
1001 error = xfs_rtbuf_get(mp, tp, block, 0, &bp);
1002 if (error) {
1003 return error;
1004 }
1005 bufp = (xfs_rtword_t *)XFS_BUF_PTR(bp);
1006 /*
1007 * Compute the starting word's address, and starting bit.
1008 */
1009 word = XFS_BITTOWORD(mp, start);
1010 b = &bufp[word];
1011 bit = (int)(start & (XFS_NBWORD - 1));
1012 /*
1013 * 0 (allocated) => all zero's; 1 (free) => all one's.
1014 */
1015 val = -val;
1016 /*
1017 * If not starting on a word boundary, deal with the first
1018 * (partial) word.
1019 */
1020 if (bit) {
1021 /*
1022 * Compute first bit not examined.
1023 */
1024 lastbit = XFS_RTMIN(bit + len, XFS_NBWORD);
1025 /*
1026 * Mask of relevant bits.
1027 */
1028 mask = (((xfs_rtword_t)1 << (lastbit - bit)) - 1) << bit;
1029 /*
1030 * Compute difference between actual and desired value.
1031 */
1032 if ((wdiff = (*b ^ val) & mask)) {
1033 /*
1034 * Different, compute first wrong bit and return.
1035 */
1036 xfs_trans_brelse(tp, bp);
1037 i = XFS_RTLOBIT(wdiff) - bit;
1038 *new = start + i;
1039 *stat = 0;
1040 return 0;
1041 }
1042 i = lastbit - bit;
1043 /*
1044 * Go on to next block if that's where the next word is
1045 * and we need the next word.
1046 */
1047 if (++word == XFS_BLOCKWSIZE(mp) && i < len) {
1048 /*
1049 * If done with this block, get the next one.
1050 */
1051 xfs_trans_brelse(tp, bp);
1052 error = xfs_rtbuf_get(mp, tp, ++block, 0, &bp);
1053 if (error) {
1054 return error;
1055 }
1056 b = bufp = (xfs_rtword_t *)XFS_BUF_PTR(bp);
1057 word = 0;
1058 } else {
1059 /*
1060 * Go on to the next word in the buffer.
1061 */
1062 b++;
1063 }
1064 } else {
1065 /*
1066 * Starting on a word boundary, no partial word.
1067 */
1068 i = 0;
1069 }
1070 /*
1071 * Loop over whole words in buffers. When we use up one buffer
1072 * we move on to the next one.
1073 */
1074 while (len - i >= XFS_NBWORD) {
1075 /*
1076 * Compute difference between actual and desired value.
1077 */
1078 if ((wdiff = *b ^ val)) {
1079 /*
1080 * Different, compute first wrong bit and return.
1081 */
1082 xfs_trans_brelse(tp, bp);
1083 i += XFS_RTLOBIT(wdiff);
1084 *new = start + i;
1085 *stat = 0;
1086 return 0;
1087 }
1088 i += XFS_NBWORD;
1089 /*
1090 * Go on to next block if that's where the next word is
1091 * and we need the next word.
1092 */
1093 if (++word == XFS_BLOCKWSIZE(mp) && i < len) {
1094 /*
1095 * If done with this block, get the next one.
1096 */
1097 xfs_trans_brelse(tp, bp);
1098 error = xfs_rtbuf_get(mp, tp, ++block, 0, &bp);
1099 if (error) {
1100 return error;
1101 }
1102 b = bufp = (xfs_rtword_t *)XFS_BUF_PTR(bp);
1103 word = 0;
1104 } else {
1105 /*
1106 * Go on to the next word in the buffer.
1107 */
1108 b++;
1109 }
1110 }
1111 /*
1112 * If not ending on a word boundary, deal with the last
1113 * (partial) word.
1114 */
1115 if ((lastbit = len - i)) {
1116 /*
1117 * Mask of relevant bits.
1118 */
1119 mask = ((xfs_rtword_t)1 << lastbit) - 1;
1120 /*
1121 * Compute difference between actual and desired value.
1122 */
1123 if ((wdiff = (*b ^ val) & mask)) {
1124 /*
1125 * Different, compute first wrong bit and return.
1126 */
1127 xfs_trans_brelse(tp, bp);
1128 i += XFS_RTLOBIT(wdiff);
1129 *new = start + i;
1130 *stat = 0;
1131 return 0;
1132 } else
1133 i = len;
1134 }
1135 /*
1136 * Successful, return.
1137 */
1138 xfs_trans_brelse(tp, bp);
1139 *new = start + i;
1140 *stat = 1;
1141 return 0;
1142 }
1143
1144 /*
1145 * Copy and transform the summary file, given the old and new
1146 * parameters in the mount structures.
1147 */
1148 STATIC int /* error */
1149 xfs_rtcopy_summary(
1150 xfs_mount_t *omp, /* old file system mount point */
1151 xfs_mount_t *nmp, /* new file system mount point */
1152 xfs_trans_t *tp) /* transaction pointer */
1153 {
1154 xfs_rtblock_t bbno; /* bitmap block number */
1155 xfs_buf_t *bp; /* summary buffer */
1156 int error; /* error return value */
1157 int log; /* summary level number (log length) */
1158 xfs_suminfo_t sum; /* summary data */
1159 xfs_fsblock_t sumbno; /* summary block number */
1160
1161 bp = NULL;
1162 for (log = omp->m_rsumlevels - 1; log >= 0; log--) {
1163 for (bbno = omp->m_sb.sb_rbmblocks - 1;
1164 (xfs_srtblock_t)bbno >= 0;
1165 bbno--) {
1166 error = xfs_rtget_summary(omp, tp, log, bbno, &bp,
1167 &sumbno, &sum);
1168 if (error)
1169 return error;
1170 if (sum == 0)
1171 continue;
1172 error = xfs_rtmodify_summary(omp, tp, log, bbno, -sum,
1173 &bp, &sumbno);
1174 if (error)
1175 return error;
1176 error = xfs_rtmodify_summary(nmp, tp, log, bbno, sum,
1177 &bp, &sumbno);
1178 if (error)
1179 return error;
1180 ASSERT(sum > 0);
1181 }
1182 }
1183 return 0;
1184 }
1185
1186 /*
1187 * Searching backward from start to limit, find the first block whose
1188 * allocated/free state is different from start's.
1189 */
1190 STATIC int /* error */
1191 xfs_rtfind_back(
1192 xfs_mount_t *mp, /* file system mount point */
1193 xfs_trans_t *tp, /* transaction pointer */
1194 xfs_rtblock_t start, /* starting block to look at */
1195 xfs_rtblock_t limit, /* last block to look at */
1196 xfs_rtblock_t *rtblock) /* out: start block found */
1197 {
1198 xfs_rtword_t *b; /* current word in buffer */
1199 int bit; /* bit number in the word */
1200 xfs_rtblock_t block; /* bitmap block number */
1201 xfs_buf_t *bp; /* buf for the block */
1202 xfs_rtword_t *bufp; /* starting word in buffer */
1203 int error; /* error value */
1204 xfs_rtblock_t firstbit; /* first useful bit in the word */
1205 xfs_rtblock_t i; /* current bit number rel. to start */
1206 xfs_rtblock_t len; /* length of inspected area */
1207 xfs_rtword_t mask; /* mask of relevant bits for value */
1208 xfs_rtword_t want; /* mask for "good" values */
1209 xfs_rtword_t wdiff; /* difference from wanted value */
1210 int word; /* word number in the buffer */
1211
1212 /*
1213 * Compute and read in starting bitmap block for starting block.
1214 */
1215 block = XFS_BITTOBLOCK(mp, start);
1216 error = xfs_rtbuf_get(mp, tp, block, 0, &bp);
1217 if (error) {
1218 return error;
1219 }
1220 bufp = (xfs_rtword_t *)XFS_BUF_PTR(bp);
1221 /*
1222 * Get the first word's index & point to it.
1223 */
1224 word = XFS_BITTOWORD(mp, start);
1225 b = &bufp[word];
1226 bit = (int)(start & (XFS_NBWORD - 1));
1227 len = start - limit + 1;
1228 /*
1229 * Compute match value, based on the bit at start: if 1 (free)
1230 * then all-ones, else all-zeroes.
1231 */
1232 want = (*b & ((xfs_rtword_t)1 << bit)) ? -1 : 0;
1233 /*
1234 * If the starting position is not word-aligned, deal with the
1235 * partial word.
1236 */
1237 if (bit < XFS_NBWORD - 1) {
1238 /*
1239 * Calculate first (leftmost) bit number to look at,
1240 * and mask for all the relevant bits in this word.
1241 */
1242 firstbit = XFS_RTMAX((xfs_srtblock_t)(bit - len + 1), 0);
1243 mask = (((xfs_rtword_t)1 << (bit - firstbit + 1)) - 1) <<
1244 firstbit;
1245 /*
1246 * Calculate the difference between the value there
1247 * and what we're looking for.
1248 */
1249 if ((wdiff = (*b ^ want) & mask)) {
1250 /*
1251 * Different. Mark where we are and return.
1252 */
1253 xfs_trans_brelse(tp, bp);
1254 i = bit - XFS_RTHIBIT(wdiff);
1255 *rtblock = start - i + 1;
1256 return 0;
1257 }
1258 i = bit - firstbit + 1;
1259 /*
1260 * Go on to previous block if that's where the previous word is
1261 * and we need the previous word.
1262 */
1263 if (--word == -1 && i < len) {
1264 /*
1265 * If done with this block, get the previous one.
1266 */
1267 xfs_trans_brelse(tp, bp);
1268 error = xfs_rtbuf_get(mp, tp, --block, 0, &bp);
1269 if (error) {
1270 return error;
1271 }
1272 bufp = (xfs_rtword_t *)XFS_BUF_PTR(bp);
1273 word = XFS_BLOCKWMASK(mp);
1274 b = &bufp[word];
1275 } else {
1276 /*
1277 * Go on to the previous word in the buffer.
1278 */
1279 b--;
1280 }
1281 } else {
1282 /*
1283 * Starting on a word boundary, no partial word.
1284 */
1285 i = 0;
1286 }
1287 /*
1288 * Loop over whole words in buffers. When we use up one buffer
1289 * we move on to the previous one.
1290 */
1291 while (len - i >= XFS_NBWORD) {
1292 /*
1293 * Compute difference between actual and desired value.
1294 */
1295 if ((wdiff = *b ^ want)) {
1296 /*
1297 * Different, mark where we are and return.
1298 */
1299 xfs_trans_brelse(tp, bp);
1300 i += XFS_NBWORD - 1 - XFS_RTHIBIT(wdiff);
1301 *rtblock = start - i + 1;
1302 return 0;
1303 }
1304 i += XFS_NBWORD;
1305 /*
1306 * Go on to previous block if that's where the previous word is
1307 * and we need the previous word.
1308 */
1309 if (--word == -1 && i < len) {
1310 /*
1311 * If done with this block, get the previous one.
1312 */
1313 xfs_trans_brelse(tp, bp);
1314 error = xfs_rtbuf_get(mp, tp, --block, 0, &bp);
1315 if (error) {
1316 return error;
1317 }
1318 bufp = (xfs_rtword_t *)XFS_BUF_PTR(bp);
1319 word = XFS_BLOCKWMASK(mp);
1320 b = &bufp[word];
1321 } else {
1322 /*
1323 * Go on to the previous word in the buffer.
1324 */
1325 b--;
1326 }
1327 }
1328 /*
1329 * If not ending on a word boundary, deal with the last
1330 * (partial) word.
1331 */
1332 if (len - i) {
1333 /*
1334 * Calculate first (leftmost) bit number to look at,
1335 * and mask for all the relevant bits in this word.
1336 */
1337 firstbit = XFS_NBWORD - (len - i);
1338 mask = (((xfs_rtword_t)1 << (len - i)) - 1) << firstbit;
1339 /*
1340 * Compute difference between actual and desired value.
1341 */
1342 if ((wdiff = (*b ^ want) & mask)) {
1343 /*
1344 * Different, mark where we are and return.
1345 */
1346 xfs_trans_brelse(tp, bp);
1347 i += XFS_NBWORD - 1 - XFS_RTHIBIT(wdiff);
1348 *rtblock = start - i + 1;
1349 return 0;
1350 } else
1351 i = len;
1352 }
1353 /*
1354 * No match, return that we scanned the whole area.
1355 */
1356 xfs_trans_brelse(tp, bp);
1357 *rtblock = start - i + 1;
1358 return 0;
1359 }
1360
1361 /*
1362 * Searching forward from start to limit, find the first block whose
1363 * allocated/free state is different from start's.
1364 */
1365 STATIC int /* error */
1366 xfs_rtfind_forw(
1367 xfs_mount_t *mp, /* file system mount point */
1368 xfs_trans_t *tp, /* transaction pointer */
1369 xfs_rtblock_t start, /* starting block to look at */
1370 xfs_rtblock_t limit, /* last block to look at */
1371 xfs_rtblock_t *rtblock) /* out: start block found */
1372 {
1373 xfs_rtword_t *b; /* current word in buffer */
1374 int bit; /* bit number in the word */
1375 xfs_rtblock_t block; /* bitmap block number */
1376 xfs_buf_t *bp; /* buf for the block */
1377 xfs_rtword_t *bufp; /* starting word in buffer */
1378 int error; /* error value */
1379 xfs_rtblock_t i; /* current bit number rel. to start */
1380 xfs_rtblock_t lastbit; /* last useful bit in the word */
1381 xfs_rtblock_t len; /* length of inspected area */
1382 xfs_rtword_t mask; /* mask of relevant bits for value */
1383 xfs_rtword_t want; /* mask for "good" values */
1384 xfs_rtword_t wdiff; /* difference from wanted value */
1385 int word; /* word number in the buffer */
1386
1387 /*
1388 * Compute and read in starting bitmap block for starting block.
1389 */
1390 block = XFS_BITTOBLOCK(mp, start);
1391 error = xfs_rtbuf_get(mp, tp, block, 0, &bp);
1392 if (error) {
1393 return error;
1394 }
1395 bufp = (xfs_rtword_t *)XFS_BUF_PTR(bp);
1396 /*
1397 * Get the first word's index & point to it.
1398 */
1399 word = XFS_BITTOWORD(mp, start);
1400 b = &bufp[word];
1401 bit = (int)(start & (XFS_NBWORD - 1));
1402 len = limit - start + 1;
1403 /*
1404 * Compute match value, based on the bit at start: if 1 (free)
1405 * then all-ones, else all-zeroes.
1406 */
1407 want = (*b & ((xfs_rtword_t)1 << bit)) ? -1 : 0;
1408 /*
1409 * If the starting position is not word-aligned, deal with the
1410 * partial word.
1411 */
1412 if (bit) {
1413 /*
1414 * Calculate last (rightmost) bit number to look at,
1415 * and mask for all the relevant bits in this word.
1416 */
1417 lastbit = XFS_RTMIN(bit + len, XFS_NBWORD);
1418 mask = (((xfs_rtword_t)1 << (lastbit - bit)) - 1) << bit;
1419 /*
1420 * Calculate the difference between the value there
1421 * and what we're looking for.
1422 */
1423 if ((wdiff = (*b ^ want) & mask)) {
1424 /*
1425 * Different. Mark where we are and return.
1426 */
1427 xfs_trans_brelse(tp, bp);
1428 i = XFS_RTLOBIT(wdiff) - bit;
1429 *rtblock = start + i - 1;
1430 return 0;
1431 }
1432 i = lastbit - bit;
1433 /*
1434 * Go on to next block if that's where the next word is
1435 * and we need the next word.
1436 */
1437 if (++word == XFS_BLOCKWSIZE(mp) && i < len) {
1438 /*
1439 * If done with this block, get the previous one.
1440 */
1441 xfs_trans_brelse(tp, bp);
1442 error = xfs_rtbuf_get(mp, tp, ++block, 0, &bp);
1443 if (error) {
1444 return error;
1445 }
1446 b = bufp = (xfs_rtword_t *)XFS_BUF_PTR(bp);
1447 word = 0;
1448 } else {
1449 /*
1450 * Go on to the previous word in the buffer.
1451 */
1452 b++;
1453 }
1454 } else {
1455 /*
1456 * Starting on a word boundary, no partial word.
1457 */
1458 i = 0;
1459 }
1460 /*
1461 * Loop over whole words in buffers. When we use up one buffer
1462 * we move on to the next one.
1463 */
1464 while (len - i >= XFS_NBWORD) {
1465 /*
1466 * Compute difference between actual and desired value.
1467 */
1468 if ((wdiff = *b ^ want)) {
1469 /*
1470 * Different, mark where we are and return.
1471 */
1472 xfs_trans_brelse(tp, bp);
1473 i += XFS_RTLOBIT(wdiff);
1474 *rtblock = start + i - 1;
1475 return 0;
1476 }
1477 i += XFS_NBWORD;
1478 /*
1479 * Go on to next block if that's where the next word is
1480 * and we need the next word.
1481 */
1482 if (++word == XFS_BLOCKWSIZE(mp) && i < len) {
1483 /*
1484 * If done with this block, get the next one.
1485 */
1486 xfs_trans_brelse(tp, bp);
1487 error = xfs_rtbuf_get(mp, tp, ++block, 0, &bp);
1488 if (error) {
1489 return error;
1490 }
1491 b = bufp = (xfs_rtword_t *)XFS_BUF_PTR(bp);
1492 word = 0;
1493 } else {
1494 /*
1495 * Go on to the next word in the buffer.
1496 */
1497 b++;
1498 }
1499 }
1500 /*
1501 * If not ending on a word boundary, deal with the last
1502 * (partial) word.
1503 */
1504 if ((lastbit = len - i)) {
1505 /*
1506 * Calculate mask for all the relevant bits in this word.
1507 */
1508 mask = ((xfs_rtword_t)1 << lastbit) - 1;
1509 /*
1510 * Compute difference between actual and desired value.
1511 */
1512 if ((wdiff = (*b ^ want) & mask)) {
1513 /*
1514 * Different, mark where we are and return.
1515 */
1516 xfs_trans_brelse(tp, bp);
1517 i += XFS_RTLOBIT(wdiff);
1518 *rtblock = start + i - 1;
1519 return 0;
1520 } else
1521 i = len;
1522 }
1523 /*
1524 * No match, return that we scanned the whole area.
1525 */
1526 xfs_trans_brelse(tp, bp);
1527 *rtblock = start + i - 1;
1528 return 0;
1529 }
1530
1531 /*
1532 * Mark an extent specified by start and len freed.
1533 * Updates all the summary information as well as the bitmap.
1534 */
1535 STATIC int /* error */
1536 xfs_rtfree_range(
1537 xfs_mount_t *mp, /* file system mount point */
1538 xfs_trans_t *tp, /* transaction pointer */
1539 xfs_rtblock_t start, /* starting block to free */
1540 xfs_extlen_t len, /* length to free */
1541 xfs_buf_t **rbpp, /* in/out: summary block buffer */
1542 xfs_fsblock_t *rsb) /* in/out: summary block number */
1543 {
1544 xfs_rtblock_t end; /* end of the freed extent */
1545 int error; /* error value */
1546 xfs_rtblock_t postblock; /* first block freed > end */
1547 xfs_rtblock_t preblock; /* first block freed < start */
1548
1549 end = start + len - 1;
1550 /*
1551 * Modify the bitmap to mark this extent freed.
1552 */
1553 error = xfs_rtmodify_range(mp, tp, start, len, 1);
1554 if (error) {
1555 return error;
1556 }
1557 /*
1558 * Assume we're freeing out of the middle of an allocated extent.
1559 * We need to find the beginning and end of the extent so we can
1560 * properly update the summary.
1561 */
1562 error = xfs_rtfind_back(mp, tp, start, 0, &preblock);
1563 if (error) {
1564 return error;
1565 }
1566 /*
1567 * Find the next allocated block (end of allocated extent).
1568 */
1569 error = xfs_rtfind_forw(mp, tp, end, mp->m_sb.sb_rextents - 1,
1570 &postblock);
1571 /*
1572 * If there are blocks not being freed at the front of the
1573 * old extent, add summary data for them to be allocated.
1574 */
1575 if (preblock < start) {
1576 error = xfs_rtmodify_summary(mp, tp,
1577 XFS_RTBLOCKLOG(start - preblock),
1578 XFS_BITTOBLOCK(mp, preblock), -1, rbpp, rsb);
1579 if (error) {
1580 return error;
1581 }
1582 }
1583 /*
1584 * If there are blocks not being freed at the end of the
1585 * old extent, add summary data for them to be allocated.
1586 */
1587 if (postblock > end) {
1588 error = xfs_rtmodify_summary(mp, tp,
1589 XFS_RTBLOCKLOG(postblock - end),
1590 XFS_BITTOBLOCK(mp, end + 1), -1, rbpp, rsb);
1591 if (error) {
1592 return error;
1593 }
1594 }
1595 /*
1596 * Increment the summary information corresponding to the entire
1597 * (new) free extent.
1598 */
1599 error = xfs_rtmodify_summary(mp, tp,
1600 XFS_RTBLOCKLOG(postblock + 1 - preblock),
1601 XFS_BITTOBLOCK(mp, preblock), 1, rbpp, rsb);
1602 return error;
1603 }
1604
1605 /*
1606 * Read and return the summary information for a given extent size,
1607 * bitmap block combination.
1608 * Keeps track of a current summary block, so we don't keep reading
1609 * it from the buffer cache.
1610 */
1611 STATIC int /* error */
1612 xfs_rtget_summary(
1613 xfs_mount_t *mp, /* file system mount structure */
1614 xfs_trans_t *tp, /* transaction pointer */
1615 int log, /* log2 of extent size */
1616 xfs_rtblock_t bbno, /* bitmap block number */
1617 xfs_buf_t **rbpp, /* in/out: summary block buffer */
1618 xfs_fsblock_t *rsb, /* in/out: summary block number */
1619 xfs_suminfo_t *sum) /* out: summary info for this block */
1620 {
1621 xfs_buf_t *bp; /* buffer for summary block */
1622 int error; /* error value */
1623 xfs_fsblock_t sb; /* summary fsblock */
1624 int so; /* index into the summary file */
1625 xfs_suminfo_t *sp; /* pointer to returned data */
1626
1627 /*
1628 * Compute entry number in the summary file.
1629 */
1630 so = XFS_SUMOFFS(mp, log, bbno);
1631 /*
1632 * Compute the block number in the summary file.
1633 */
1634 sb = XFS_SUMOFFSTOBLOCK(mp, so);
1635 /*
1636 * If we have an old buffer, and the block number matches, use that.
1637 */
1638 if (rbpp && *rbpp && *rsb == sb)
1639 bp = *rbpp;
1640 /*
1641 * Otherwise we have to get the buffer.
1642 */
1643 else {
1644 /*
1645 * If there was an old one, get rid of it first.
1646 */
1647 if (rbpp && *rbpp)
1648 xfs_trans_brelse(tp, *rbpp);
1649 error = xfs_rtbuf_get(mp, tp, sb, 1, &bp);
1650 if (error) {
1651 return error;
1652 }
1653 /*
1654 * Remember this buffer and block for the next call.
1655 */
1656 if (rbpp) {
1657 *rbpp = bp;
1658 *rsb = sb;
1659 }
1660 }
1661 /*
1662 * Point to the summary information & copy it out.
1663 */
1664 sp = XFS_SUMPTR(mp, bp, so);
1665 *sum = *sp;
1666 /*
1667 * Drop the buffer if we're not asked to remember it.
1668 */
1669 if (!rbpp)
1670 xfs_trans_brelse(tp, bp);
1671 return 0;
1672 }
1673
1674 /*
1675 * Set the given range of bitmap bits to the given value.
1676 * Do whatever I/O and logging is required.
1677 */
1678 STATIC int /* error */
1679 xfs_rtmodify_range(
1680 xfs_mount_t *mp, /* file system mount point */
1681 xfs_trans_t *tp, /* transaction pointer */
1682 xfs_rtblock_t start, /* starting block to modify */
1683 xfs_extlen_t len, /* length of extent to modify */
1684 int val) /* 1 for free, 0 for allocated */
1685 {
1686 xfs_rtword_t *b; /* current word in buffer */
1687 int bit; /* bit number in the word */
1688 xfs_rtblock_t block; /* bitmap block number */
1689 xfs_buf_t *bp; /* buf for the block */
1690 xfs_rtword_t *bufp; /* starting word in buffer */
1691 int error; /* error value */
1692 xfs_rtword_t *first; /* first used word in the buffer */
1693 int i; /* current bit number rel. to start */
1694 int lastbit; /* last useful bit in word */
1695 xfs_rtword_t mask; /* mask o frelevant bits for value */
1696 int word; /* word number in the buffer */
1697
1698 /*
1699 * Compute starting bitmap block number.
1700 */
1701 block = XFS_BITTOBLOCK(mp, start);
1702 /*
1703 * Read the bitmap block, and point to its data.
1704 */
1705 error = xfs_rtbuf_get(mp, tp, block, 0, &bp);
1706 if (error) {
1707 return error;
1708 }
1709 bufp = (xfs_rtword_t *)XFS_BUF_PTR(bp);
1710 /*
1711 * Compute the starting word's address, and starting bit.
1712 */
1713 word = XFS_BITTOWORD(mp, start);
1714 first = b = &bufp[word];
1715 bit = (int)(start & (XFS_NBWORD - 1));
1716 /*
1717 * 0 (allocated) => all zeroes; 1 (free) => all ones.
1718 */
1719 val = -val;
1720 /*
1721 * If not starting on a word boundary, deal with the first
1722 * (partial) word.
1723 */
1724 if (bit) {
1725 /*
1726 * Compute first bit not changed and mask of relevant bits.
1727 */
1728 lastbit = XFS_RTMIN(bit + len, XFS_NBWORD);
1729 mask = (((xfs_rtword_t)1 << (lastbit - bit)) - 1) << bit;
1730 /*
1731 * Set/clear the active bits.
1732 */
1733 if (val)
1734 *b |= mask;
1735 else
1736 *b &= ~mask;
1737 i = lastbit - bit;
1738 /*
1739 * Go on to the next block if that's where the next word is
1740 * and we need the next word.
1741 */
1742 if (++word == XFS_BLOCKWSIZE(mp) && i < len) {
1743 /*
1744 * Log the changed part of this block.
1745 * Get the next one.
1746 */
1747 xfs_trans_log_buf(tp, bp,
1748 (uint)((char *)first - (char *)bufp),
1749 (uint)((char *)b - (char *)bufp));
1750 error = xfs_rtbuf_get(mp, tp, ++block, 0, &bp);
1751 if (error) {
1752 return error;
1753 }
1754 first = b = bufp = (xfs_rtword_t *)XFS_BUF_PTR(bp);
1755 word = 0;
1756 } else {
1757 /*
1758 * Go on to the next word in the buffer
1759 */
1760 b++;
1761 }
1762 } else {
1763 /*
1764 * Starting on a word boundary, no partial word.
1765 */
1766 i = 0;
1767 }
1768 /*
1769 * Loop over whole words in buffers. When we use up one buffer
1770 * we move on to the next one.
1771 */
1772 while (len - i >= XFS_NBWORD) {
1773 /*
1774 * Set the word value correctly.
1775 */
1776 *b = val;
1777 i += XFS_NBWORD;
1778 /*
1779 * Go on to the next block if that's where the next word is
1780 * and we need the next word.
1781 */
1782 if (++word == XFS_BLOCKWSIZE(mp) && i < len) {
1783 /*
1784 * Log the changed part of this block.
1785 * Get the next one.
1786 */
1787 xfs_trans_log_buf(tp, bp,
1788 (uint)((char *)first - (char *)bufp),
1789 (uint)((char *)b - (char *)bufp));
1790 error = xfs_rtbuf_get(mp, tp, ++block, 0, &bp);
1791 if (error) {
1792 return error;
1793 }
1794 first = b = bufp = (xfs_rtword_t *)XFS_BUF_PTR(bp);
1795 word = 0;
1796 } else {
1797 /*
1798 * Go on to the next word in the buffer
1799 */
1800 b++;
1801 }
1802 }
1803 /*
1804 * If not ending on a word boundary, deal with the last
1805 * (partial) word.
1806 */
1807 if ((lastbit = len - i)) {
1808 /*
1809 * Compute a mask of relevant bits.
1810 */
1811 bit = 0;
1812 mask = ((xfs_rtword_t)1 << lastbit) - 1;
1813 /*
1814 * Set/clear the active bits.
1815 */
1816 if (val)
1817 *b |= mask;
1818 else
1819 *b &= ~mask;
1820 b++;
1821 }
1822 /*
1823 * Log any remaining changed bytes.
1824 */
1825 if (b > first)
1826 xfs_trans_log_buf(tp, bp, (uint)((char *)first - (char *)bufp),
1827 (uint)((char *)b - (char *)bufp - 1));
1828 return 0;
1829 }
1830
1831 /*
1832 * Read and modify the summary information for a given extent size,
1833 * bitmap block combination.
1834 * Keeps track of a current summary block, so we don't keep reading
1835 * it from the buffer cache.
1836 */
1837 STATIC int /* error */
1838 xfs_rtmodify_summary(
1839 xfs_mount_t *mp, /* file system mount point */
1840 xfs_trans_t *tp, /* transaction pointer */
1841 int log, /* log2 of extent size */
1842 xfs_rtblock_t bbno, /* bitmap block number */
1843 int delta, /* change to make to summary info */
1844 xfs_buf_t **rbpp, /* in/out: summary block buffer */
1845 xfs_fsblock_t *rsb) /* in/out: summary block number */
1846 {
1847 xfs_buf_t *bp; /* buffer for the summary block */
1848 int error; /* error value */
1849 xfs_fsblock_t sb; /* summary fsblock */
1850 int so; /* index into the summary file */
1851 xfs_suminfo_t *sp; /* pointer to returned data */
1852
1853 /*
1854 * Compute entry number in the summary file.
1855 */
1856 so = XFS_SUMOFFS(mp, log, bbno);
1857 /*
1858 * Compute the block number in the summary file.
1859 */
1860 sb = XFS_SUMOFFSTOBLOCK(mp, so);
1861 /*
1862 * If we have an old buffer, and the block number matches, use that.
1863 */
1864 if (rbpp && *rbpp && *rsb == sb)
1865 bp = *rbpp;
1866 /*
1867 * Otherwise we have to get the buffer.
1868 */
1869 else {
1870 /*
1871 * If there was an old one, get rid of it first.
1872 */
1873 if (rbpp && *rbpp)
1874 xfs_trans_brelse(tp, *rbpp);
1875 error = xfs_rtbuf_get(mp, tp, sb, 1, &bp);
1876 if (error) {
1877 return error;
1878 }
1879 /*
1880 * Remember this buffer and block for the next call.
1881 */
1882 if (rbpp) {
1883 *rbpp = bp;
1884 *rsb = sb;
1885 }
1886 }
1887 /*
1888 * Point to the summary information, modify and log it.
1889 */
1890 sp = XFS_SUMPTR(mp, bp, so);
1891 *sp += delta;
1892 xfs_trans_log_buf(tp, bp, (uint)((char *)sp - (char *)XFS_BUF_PTR(bp)),
1893 (uint)((char *)sp - (char *)XFS_BUF_PTR(bp) + sizeof(*sp) - 1));
1894 return 0;
1895 }
1896
1897 /*
1898 * Visible (exported) functions.
1899 */
1900
1901 /*
1902 * Grow the realtime area of the filesystem.
1903 */
1904 int
1905 xfs_growfs_rt(
1906 xfs_mount_t *mp, /* mount point for filesystem */
1907 xfs_growfs_rt_t *in) /* growfs rt input struct */
1908 {
1909 xfs_rtblock_t bmbno; /* bitmap block number */
1910 xfs_buf_t *bp; /* temporary buffer */
1911 int cancelflags; /* flags for xfs_trans_cancel */
1912 int error; /* error return value */
1913 xfs_inode_t *ip; /* bitmap inode, used as lock */
1914 xfs_mount_t *nmp; /* new (fake) mount structure */
1915 xfs_drfsbno_t nrblocks; /* new number of realtime blocks */
1916 xfs_extlen_t nrbmblocks; /* new number of rt bitmap blocks */
1917 xfs_drtbno_t nrextents; /* new number of realtime extents */
1918 uint8_t nrextslog; /* new log2 of sb_rextents */
1919 xfs_extlen_t nrsumblocks; /* new number of summary blocks */
1920 uint nrsumlevels; /* new rt summary levels */
1921 uint nrsumsize; /* new size of rt summary, bytes */
1922 xfs_sb_t *nsbp; /* new superblock */
1923 xfs_extlen_t rbmblocks; /* current number of rt bitmap blocks */
1924 xfs_extlen_t rsumblocks; /* current number of rt summary blks */
1925 xfs_sb_t *sbp; /* old superblock */
1926 xfs_fsblock_t sumbno; /* summary block number */
1927 xfs_trans_t *tp; /* transaction pointer */
1928
1929 sbp = &mp->m_sb;
1930 /*
1931 * Initial error checking.
1932 */
1933 if (mp->m_rtdev_targp || mp->m_rbmip == NULL ||
1934 (nrblocks = in->newblocks) <= sbp->sb_rblocks ||
1935 (sbp->sb_rblocks && (in->extsize != sbp->sb_rextsize)))
1936 return XFS_ERROR(EINVAL);
1937 /*
1938 * Read in the last block of the device, make sure it exists.
1939 */
1940 error = xfs_read_buf(mp, mp->m_rtdev_targp,
1941 XFS_FSB_TO_BB(mp, in->newblocks - 1),
1942 XFS_FSB_TO_BB(mp, 1), 0, &bp);
1943 if (error)
1944 return error;
1945 ASSERT(bp);
1946 xfs_buf_relse(bp);
1947 /*
1948 * Calculate new parameters. These are the final values to be reached.
1949 */
1950 nrextents = nrblocks;
1951 do_div(nrextents, in->extsize);
1952 nrbmblocks = roundup_64(nrextents, NBBY * sbp->sb_blocksize);
1953 nrextslog = xfs_highbit32(nrextents);
1954 nrsumlevels = nrextslog + 1;
1955 nrsumsize = (uint)sizeof(xfs_suminfo_t) * nrsumlevels * nrbmblocks;
1956 nrsumblocks = XFS_B_TO_FSB(mp, nrsumsize);
1957 nrsumsize = XFS_FSB_TO_B(mp, nrsumblocks);
1958 /*
1959 * New summary size can't be more than half the size of
1960 * the log. This prevents us from getting a log overflow,
1961 * since we'll log basically the whole summary file at once.
1962 */
1963 if (nrsumblocks > (mp->m_sb.sb_logblocks >> 1))
1964 return XFS_ERROR(EINVAL);
1965 /*
1966 * Get the old block counts for bitmap and summary inodes.
1967 * These can't change since other growfs callers are locked out.
1968 */
1969 rbmblocks = XFS_B_TO_FSB(mp, mp->m_rbmip->i_d.di_size);
1970 rsumblocks = XFS_B_TO_FSB(mp, mp->m_rsumip->i_d.di_size);
1971 /*
1972 * Allocate space to the bitmap and summary files, as necessary.
1973 */
1974 if ((error = xfs_growfs_rt_alloc(mp, rbmblocks, nrbmblocks,
1975 mp->m_sb.sb_rbmino)))
1976 return error;
1977 if ((error = xfs_growfs_rt_alloc(mp, rsumblocks, nrsumblocks,
1978 mp->m_sb.sb_rsumino)))
1979 return error;
1980 nmp = NULL;
1981 /*
1982 * Loop over the bitmap blocks.
1983 * We will do everything one bitmap block at a time.
1984 * Skip the current block if it is exactly full.
1985 * This also deals with the case where there were no rtextents before.
1986 */
1987 for (bmbno = sbp->sb_rbmblocks -
1988 ((sbp->sb_rextents & ((1 << mp->m_blkbit_log) - 1)) != 0);
1989 bmbno < nrbmblocks;
1990 bmbno++) {
1991 /*
1992 * Allocate a new (fake) mount/sb.
1993 */
1994 nmp = kmem_alloc(sizeof(*nmp), KM_SLEEP);
1995 *nmp = *mp;
1996 nsbp = &nmp->m_sb;
1997 /*
1998 * Calculate new sb and mount fields for this round.
1999 */
2000 nsbp->sb_rextsize = in->extsize;
2001 nsbp->sb_rbmblocks = bmbno + 1;
2002 nsbp->sb_rblocks =
2003 XFS_RTMIN(nrblocks,
2004 nsbp->sb_rbmblocks * NBBY *
2005 nsbp->sb_blocksize * nsbp->sb_rextsize);
2006 nsbp->sb_rextents = nsbp->sb_rblocks;
2007 do_div(nsbp->sb_rextents, nsbp->sb_rextsize);
2008 nsbp->sb_rextslog = xfs_highbit32(nsbp->sb_rextents);
2009 nrsumlevels = nmp->m_rsumlevels = nsbp->sb_rextslog + 1;
2010 nrsumsize =
2011 (uint)sizeof(xfs_suminfo_t) * nrsumlevels *
2012 nsbp->sb_rbmblocks;
2013 nrsumblocks = XFS_B_TO_FSB(mp, nrsumsize);
2014 nmp->m_rsumsize = nrsumsize = XFS_FSB_TO_B(mp, nrsumblocks);
2015 /*
2016 * Start a transaction, get the log reservation.
2017 */
2018 tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFSRT_FREE);
2019 cancelflags = 0;
2020 if ((error = xfs_trans_reserve(tp, 0,
2021 XFS_GROWRTFREE_LOG_RES(nmp), 0, 0, 0)))
2022 goto error_exit;
2023 /*
2024 * Lock out other callers by grabbing the bitmap inode lock.
2025 */
2026 if ((error = xfs_trans_iget(mp, tp, 0, mp->m_sb.sb_rbmino,
2027 XFS_ILOCK_EXCL, &ip)))
2028 goto error_exit;
2029 ASSERT(ip == mp->m_rbmip);
2030 /*
2031 * Update the bitmap inode's size.
2032 */
2033 mp->m_rbmip->i_d.di_size =
2034 nsbp->sb_rbmblocks * nsbp->sb_blocksize;
2035 xfs_trans_log_inode(tp, mp->m_rbmip, XFS_ILOG_CORE);
2036 cancelflags |= XFS_TRANS_ABORT;
2037 /*
2038 * Get the summary inode into the transaction.
2039 */
2040 if ((error = xfs_trans_iget(mp, tp, mp->m_sb.sb_rsumino,
2041 0, XFS_ILOCK_EXCL, &ip)))
2042 goto error_exit;
2043 ASSERT(ip == mp->m_rsumip);
2044 /*
2045 * Update the summary inode's size.
2046 */
2047 mp->m_rsumip->i_d.di_size = nmp->m_rsumsize;
2048 xfs_trans_log_inode(tp, mp->m_rsumip, XFS_ILOG_CORE);
2049 /*
2050 * Copy summary data from old to new sizes.
2051 * Do this when the real size (not block-aligned) changes.
2052 */
2053 if (sbp->sb_rbmblocks != nsbp->sb_rbmblocks ||
2054 mp->m_rsumlevels != nmp->m_rsumlevels) {
2055 error = xfs_rtcopy_summary(mp, nmp, tp);
2056 if (error)
2057 goto error_exit;
2058 }
2059 /*
2060 * Update superblock fields.
2061 */
2062 if (nsbp->sb_rextsize != sbp->sb_rextsize)
2063 xfs_trans_mod_sb(tp, XFS_TRANS_SB_REXTSIZE,
2064 nsbp->sb_rextsize - sbp->sb_rextsize);
2065 if (nsbp->sb_rbmblocks != sbp->sb_rbmblocks)
2066 xfs_trans_mod_sb(tp, XFS_TRANS_SB_RBMBLOCKS,
2067 nsbp->sb_rbmblocks - sbp->sb_rbmblocks);
2068 if (nsbp->sb_rblocks != sbp->sb_rblocks)
2069 xfs_trans_mod_sb(tp, XFS_TRANS_SB_RBLOCKS,
2070 nsbp->sb_rblocks - sbp->sb_rblocks);
2071 if (nsbp->sb_rextents != sbp->sb_rextents)
2072 xfs_trans_mod_sb(tp, XFS_TRANS_SB_REXTENTS,
2073 nsbp->sb_rextents - sbp->sb_rextents);
2074 if (nsbp->sb_rextslog != sbp->sb_rextslog)
2075 xfs_trans_mod_sb(tp, XFS_TRANS_SB_REXTSLOG,
2076 nsbp->sb_rextslog - sbp->sb_rextslog);
2077 /*
2078 * Free new extent.
2079 */
2080 bp = NULL;
2081 error = xfs_rtfree_range(nmp, tp, sbp->sb_rextents,
2082 nsbp->sb_rextents - sbp->sb_rextents, &bp, &sumbno);
2083 if (error)
2084 goto error_exit;
2085 /*
2086 * Mark more blocks free in the superblock.
2087 */
2088 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FREXTENTS,
2089 nsbp->sb_rextents - sbp->sb_rextents);
2090 /*
2091 * Free the fake mp structure.
2092 */
2093 kmem_free(nmp, sizeof(*nmp));
2094 nmp = NULL;
2095 /*
2096 * Update mp values into the real mp structure.
2097 */
2098 mp->m_rsumlevels = nrsumlevels;
2099 mp->m_rsumsize = nrsumsize;
2100 /*
2101 * Commit the transaction.
2102 */
2103 xfs_trans_commit(tp, 0, NULL);
2104 }
2105 return 0;
2106
2107 /*
2108 * Error paths come here.
2109 */
2110 error_exit:
2111 if (nmp)
2112 kmem_free(nmp, sizeof(*nmp));
2113 xfs_trans_cancel(tp, cancelflags);
2114 return error;
2115 }
2116
2117 /*
2118 * Allocate an extent in the realtime subvolume, with the usual allocation
2119 * parameters. The length units are all in realtime extents, as is the
2120 * result block number.
2121 */
2122 int /* error */
2123 xfs_rtallocate_extent(
2124 xfs_trans_t *tp, /* transaction pointer */
2125 xfs_rtblock_t bno, /* starting block number to allocate */
2126 xfs_extlen_t minlen, /* minimum length to allocate */
2127 xfs_extlen_t maxlen, /* maximum length to allocate */
2128 xfs_extlen_t *len, /* out: actual length allocated */
2129 xfs_alloctype_t type, /* allocation type XFS_ALLOCTYPE... */
2130 int wasdel, /* was a delayed allocation extent */
2131 xfs_extlen_t prod, /* extent product factor */
2132 xfs_rtblock_t *rtblock) /* out: start block allocated */
2133 {
2134 int error; /* error value */
2135 xfs_inode_t *ip; /* inode for bitmap file */
2136 xfs_mount_t *mp; /* file system mount structure */
2137 xfs_rtblock_t r; /* result allocated block */
2138 xfs_fsblock_t sb; /* summary file block number */
2139 xfs_buf_t *sumbp; /* summary file block buffer */
2140
2141 ASSERT(minlen > 0 && minlen <= maxlen);
2142 mp = tp->t_mountp;
2143 /*
2144 * If prod is set then figure out what to do to minlen and maxlen.
2145 */
2146 if (prod > 1) {
2147 xfs_extlen_t i;
2148
2149 if ((i = maxlen % prod))
2150 maxlen -= i;
2151 if ((i = minlen % prod))
2152 minlen += prod - i;
2153 if (maxlen < minlen) {
2154 *rtblock = NULLRTBLOCK;
2155 return 0;
2156 }
2157 }
2158 /*
2159 * Lock out other callers by grabbing the bitmap inode lock.
2160 */
2161 error = xfs_trans_iget(mp, tp, mp->m_sb.sb_rbmino, 0, XFS_ILOCK_EXCL, &ip);
2162 if (error) {
2163 return error;
2164 }
2165 sumbp = NULL;
2166 /*
2167 * Allocate by size, or near another block, or exactly at some block.
2168 */
2169 switch (type) {
2170 case XFS_ALLOCTYPE_ANY_AG:
2171 error = xfs_rtallocate_extent_size(mp, tp, minlen, maxlen, len,
2172 &sumbp, &sb, prod, &r);
2173 break;
2174 case XFS_ALLOCTYPE_NEAR_BNO:
2175 error = xfs_rtallocate_extent_near(mp, tp, bno, minlen, maxlen,
2176 len, &sumbp, &sb, prod, &r);
2177 break;
2178 case XFS_ALLOCTYPE_THIS_BNO:
2179 error = xfs_rtallocate_extent_exact(mp, tp, bno, minlen, maxlen,
2180 len, &sumbp, &sb, prod, &r);
2181 break;
2182 default:
2183 ASSERT(0);
2184 }
2185 if (error) {
2186 return error;
2187 }
2188 /*
2189 * If it worked, update the superblock.
2190 */
2191 if (r != NULLRTBLOCK) {
2192 long slen = (long)*len;
2193
2194 ASSERT(*len >= minlen && *len <= maxlen);
2195 if (wasdel)
2196 xfs_trans_mod_sb(tp, XFS_TRANS_SB_RES_FREXTENTS, -slen);
2197 else
2198 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FREXTENTS, -slen);
2199 }
2200 *rtblock = r;
2201 return 0;
2202 }
2203
2204 /*
2205 * Free an extent in the realtime subvolume. Length is expressed in
2206 * realtime extents, as is the block number.
2207 */
2208 int /* error */
2209 xfs_rtfree_extent(
2210 xfs_trans_t *tp, /* transaction pointer */
2211 xfs_rtblock_t bno, /* starting block number to free */
2212 xfs_extlen_t len) /* length of extent freed */
2213 {
2214 int error; /* error value */
2215 xfs_inode_t *ip; /* bitmap file inode */
2216 xfs_mount_t *mp; /* file system mount structure */
2217 xfs_fsblock_t sb; /* summary file block number */
2218 xfs_buf_t *sumbp; /* summary file block buffer */
2219
2220 mp = tp->t_mountp;
2221 /*
2222 * Synchronize by locking the bitmap inode.
2223 */
2224 error = xfs_trans_iget(mp, tp, mp->m_sb.sb_rbmino, 0, XFS_ILOCK_EXCL, &ip);
2225 if (error) {
2226 return error;
2227 }
2228 #if defined(__KERNEL__) && defined(DEBUG)
2229 /*
2230 * Check to see that this whole range is currently allocated.
2231 */
2232 {
2233 int stat; /* result from checking range */
2234
2235 error = xfs_rtcheck_alloc_range(mp, tp, bno, len, &stat);
2236 if (error) {
2237 return error;
2238 }
2239 ASSERT(stat);
2240 }
2241 #endif
2242 sumbp = NULL;
2243 /*
2244 * Free the range of realtime blocks.
2245 */
2246 error = xfs_rtfree_range(mp, tp, bno, len, &sumbp, &sb);
2247 if (error) {
2248 return error;
2249 }
2250 /*
2251 * Mark more blocks free in the superblock.
2252 */
2253 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FREXTENTS, (long)len);
2254 /*
2255 * If we've now freed all the blocks, reset the file sequence
2256 * number to 0.
2257 */
2258 if (tp->t_frextents_delta + mp->m_sb.sb_frextents ==
2259 mp->m_sb.sb_rextents) {
2260 if (!(ip->i_d.di_flags & XFS_DIFLAG_NEWRTBM))
2261 ip->i_d.di_flags |= XFS_DIFLAG_NEWRTBM;
2262 *(__uint64_t *)&ip->i_d.di_atime = 0;
2263 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
2264 }
2265 return 0;
2266 }
2267
2268 /*
2269 * Initialize realtime fields in the mount structure.
2270 */
2271 int /* error */
2272 xfs_rtmount_init(
2273 xfs_mount_t *mp) /* file system mount structure */
2274 {
2275 xfs_buf_t *bp; /* buffer for last block of subvolume */
2276 xfs_daddr_t d; /* address of last block of subvolume */
2277 int error; /* error return value */
2278 xfs_sb_t *sbp; /* filesystem superblock copy in mount */
2279
2280 sbp = &mp->m_sb;
2281 if (sbp->sb_rblocks == 0)
2282 return 0;
2283 if (mp->m_rtdev_targp == NULL) {
2284 cmn_err(CE_WARN,
2285 "XFS: This filesystem has a realtime volume, use rtdev=device option");
2286 return XFS_ERROR(ENODEV);
2287 }
2288 mp->m_rsumlevels = sbp->sb_rextslog + 1;
2289 mp->m_rsumsize =
2290 (uint)sizeof(xfs_suminfo_t) * mp->m_rsumlevels *
2291 sbp->sb_rbmblocks;
2292 mp->m_rsumsize = roundup(mp->m_rsumsize, sbp->sb_blocksize);
2293 mp->m_rbmip = mp->m_rsumip = NULL;
2294 /*
2295 * Check that the realtime section is an ok size.
2296 */
2297 d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_rblocks);
2298 if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_rblocks) {
2299 cmn_err(CE_WARN, "XFS: realtime mount -- %llu != %llu",
2300 (unsigned long long) XFS_BB_TO_FSB(mp, d),
2301 (unsigned long long) mp->m_sb.sb_rblocks);
2302 return XFS_ERROR(E2BIG);
2303 }
2304 error = xfs_read_buf(mp, mp->m_rtdev_targp,
2305 d - XFS_FSB_TO_BB(mp, 1),
2306 XFS_FSB_TO_BB(mp, 1), 0, &bp);
2307 if (error) {
2308 cmn_err(CE_WARN,
2309 "XFS: realtime mount -- xfs_read_buf failed, returned %d", error);
2310 if (error == ENOSPC)
2311 return XFS_ERROR(E2BIG);
2312 return error;
2313 }
2314 xfs_buf_relse(bp);
2315 return 0;
2316 }
2317
2318 /*
2319 * Get the bitmap and summary inodes into the mount structure
2320 * at mount time.
2321 */
2322 int /* error */
2323 xfs_rtmount_inodes(
2324 xfs_mount_t *mp) /* file system mount structure */
2325 {
2326 int error; /* error return value */
2327 xfs_sb_t *sbp;
2328
2329 sbp = &mp->m_sb;
2330 if (sbp->sb_rbmino == NULLFSINO)
2331 return 0;
2332 error = xfs_iget(mp, NULL, sbp->sb_rbmino, 0, 0, &mp->m_rbmip, 0);
2333 if (error)
2334 return error;
2335 ASSERT(mp->m_rbmip != NULL);
2336 ASSERT(sbp->sb_rsumino != NULLFSINO);
2337 error = xfs_iget(mp, NULL, sbp->sb_rsumino, 0, 0, &mp->m_rsumip, 0);
2338 if (error) {
2339 VN_RELE(XFS_ITOV(mp->m_rbmip));
2340 return error;
2341 }
2342 ASSERT(mp->m_rsumip != NULL);
2343 return 0;
2344 }
2345
2346 /*
2347 * Pick an extent for allocation at the start of a new realtime file.
2348 * Use the sequence number stored in the atime field of the bitmap inode.
2349 * Translate this to a fraction of the rtextents, and return the product
2350 * of rtextents and the fraction.
2351 * The fraction sequence is 0, 1/2, 1/4, 3/4, 1/8, ..., 7/8, 1/16, ...
2352 */
2353 int /* error */
2354 xfs_rtpick_extent(
2355 xfs_mount_t *mp, /* file system mount point */
2356 xfs_trans_t *tp, /* transaction pointer */
2357 xfs_extlen_t len, /* allocation length (rtextents) */
2358 xfs_rtblock_t *pick) /* result rt extent */
2359 {
2360 xfs_rtblock_t b; /* result block */
2361 int error; /* error return value */
2362 xfs_inode_t *ip; /* bitmap incore inode */
2363 int log2; /* log of sequence number */
2364 __uint64_t resid; /* residual after log removed */
2365 __uint64_t seq; /* sequence number of file creation */
2366 __uint64_t *seqp; /* pointer to seqno in inode */
2367
2368 error = xfs_trans_iget(mp, tp, mp->m_sb.sb_rbmino, 0, XFS_ILOCK_EXCL, &ip);
2369 if (error)
2370 return error;
2371 ASSERT(ip == mp->m_rbmip);
2372 seqp = (__uint64_t *)&ip->i_d.di_atime;
2373 if (!(ip->i_d.di_flags & XFS_DIFLAG_NEWRTBM)) {
2374 ip->i_d.di_flags |= XFS_DIFLAG_NEWRTBM;
2375 *seqp = 0;
2376 }
2377 seq = *seqp;
2378 if ((log2 = xfs_highbit64(seq)) == -1)
2379 b = 0;
2380 else {
2381 resid = seq - (1ULL << log2);
2382 b = (mp->m_sb.sb_rextents * ((resid << 1) + 1ULL)) >>
2383 (log2 + 1);
2384 if (b >= mp->m_sb.sb_rextents)
2385 b = do_mod(b, mp->m_sb.sb_rextents);
2386 if (b + len > mp->m_sb.sb_rextents)
2387 b = mp->m_sb.sb_rextents - len;
2388 }
2389 *seqp = seq + 1;
2390 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
2391 *pick = b;
2392 return 0;
2393 }
2394
2395 #ifdef DEBUG
2396 /*
2397 * Debug code: print out the value of a range in the bitmap.
2398 */
2399 void
2400 xfs_rtprint_range(
2401 xfs_mount_t *mp, /* file system mount structure */
2402 xfs_trans_t *tp, /* transaction pointer */
2403 xfs_rtblock_t start, /* starting block to print */
2404 xfs_extlen_t len) /* length to print */
2405 {
2406 xfs_extlen_t i; /* block number in the extent */
2407
2408 printk("%Ld: ", (long long)start);
2409 for (i = 0; i < len; i++)
2410 printk("%d", xfs_rtcheck_bit(mp, tp, start + i, 1));
2411 printk("\n");
2412 }
2413
2414 /*
2415 * Debug code: print the summary file.
2416 */
2417 void
2418 xfs_rtprint_summary(
2419 xfs_mount_t *mp, /* file system mount structure */
2420 xfs_trans_t *tp) /* transaction pointer */
2421 {
2422 xfs_suminfo_t c; /* summary data */
2423 xfs_rtblock_t i; /* bitmap block number */
2424 int l; /* summary information level */
2425 int p; /* flag for printed anything */
2426 xfs_fsblock_t sb; /* summary block number */
2427 xfs_buf_t *sumbp; /* summary block buffer */
2428
2429 sumbp = NULL;
2430 for (l = 0; l < mp->m_rsumlevels; l++) {
2431 for (p = 0, i = 0; i < mp->m_sb.sb_rbmblocks; i++) {
2432 (void)xfs_rtget_summary(mp, tp, l, i, &sumbp, &sb, &c);
2433 if (c) {
2434 if (!p) {
2435 printk("%Ld-%Ld:", 1LL << l,
2436 XFS_RTMIN((1LL << l) +
2437 ((1LL << l) - 1LL),
2438 mp->m_sb.sb_rextents));
2439 p = 1;
2440 }
2441 printk(" %Ld:%d", (long long)i, c);
2442 }
2443 }
2444 if (p)
2445 printk("\n");
2446 }
2447 if (sumbp)
2448 xfs_trans_brelse(tp, sumbp);
2449 }
2450 #endif /* DEBUG */
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