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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
4 * All Rights Reserved.
5 */
6#include "xfs.h"
7#include "xfs_fs.h"
8#include "xfs_shared.h"
9#include "xfs_format.h"
10#include "xfs_log_format.h"
11#include "xfs_trans_resv.h"
12#include "xfs_bit.h"
13#include "xfs_mount.h"
14#include "xfs_inode.h"
15#include "xfs_bmap.h"
16#include "xfs_bmap_btree.h"
17#include "xfs_trans.h"
18#include "xfs_trans_space.h"
19#include "xfs_icache.h"
20#include "xfs_rtalloc.h"
21#include "xfs_sb.h"
22
23/*
24 * Read and return the summary information for a given extent size,
25 * bitmap block combination.
26 * Keeps track of a current summary block, so we don't keep reading
27 * it from the buffer cache.
28 */
29static int
30xfs_rtget_summary(
31 xfs_mount_t *mp, /* file system mount structure */
32 xfs_trans_t *tp, /* transaction pointer */
33 int log, /* log2 of extent size */
34 xfs_rtblock_t bbno, /* bitmap block number */
35 struct xfs_buf **rbpp, /* in/out: summary block buffer */
36 xfs_fsblock_t *rsb, /* in/out: summary block number */
37 xfs_suminfo_t *sum) /* out: summary info for this block */
38{
39 return xfs_rtmodify_summary_int(mp, tp, log, bbno, 0, rbpp, rsb, sum);
40}
41
42/*
43 * Return whether there are any free extents in the size range given
44 * by low and high, for the bitmap block bbno.
45 */
46STATIC int /* error */
47xfs_rtany_summary(
48 xfs_mount_t *mp, /* file system mount structure */
49 xfs_trans_t *tp, /* transaction pointer */
50 int low, /* low log2 extent size */
51 int high, /* high log2 extent size */
52 xfs_rtblock_t bbno, /* bitmap block number */
53 struct xfs_buf **rbpp, /* in/out: summary block buffer */
54 xfs_fsblock_t *rsb, /* in/out: summary block number */
55 int *stat) /* out: any good extents here? */
56{
57 int error; /* error value */
58 int log; /* loop counter, log2 of ext. size */
59 xfs_suminfo_t sum; /* summary data */
60
61 /* There are no extents at levels < m_rsum_cache[bbno]. */
62 if (mp->m_rsum_cache && low < mp->m_rsum_cache[bbno])
63 low = mp->m_rsum_cache[bbno];
64
65 /*
66 * Loop over logs of extent sizes.
67 */
68 for (log = low; log <= high; log++) {
69 /*
70 * Get one summary datum.
71 */
72 error = xfs_rtget_summary(mp, tp, log, bbno, rbpp, rsb, &sum);
73 if (error) {
74 return error;
75 }
76 /*
77 * If there are any, return success.
78 */
79 if (sum) {
80 *stat = 1;
81 goto out;
82 }
83 }
84 /*
85 * Found nothing, return failure.
86 */
87 *stat = 0;
88out:
89 /* There were no extents at levels < log. */
90 if (mp->m_rsum_cache && log > mp->m_rsum_cache[bbno])
91 mp->m_rsum_cache[bbno] = log;
92 return 0;
93}
94
95
96/*
97 * Copy and transform the summary file, given the old and new
98 * parameters in the mount structures.
99 */
100STATIC int /* error */
101xfs_rtcopy_summary(
102 xfs_mount_t *omp, /* old file system mount point */
103 xfs_mount_t *nmp, /* new file system mount point */
104 xfs_trans_t *tp) /* transaction pointer */
105{
106 xfs_rtblock_t bbno; /* bitmap block number */
107 struct xfs_buf *bp; /* summary buffer */
108 int error; /* error return value */
109 int log; /* summary level number (log length) */
110 xfs_suminfo_t sum; /* summary data */
111 xfs_fsblock_t sumbno; /* summary block number */
112
113 bp = NULL;
114 for (log = omp->m_rsumlevels - 1; log >= 0; log--) {
115 for (bbno = omp->m_sb.sb_rbmblocks - 1;
116 (xfs_srtblock_t)bbno >= 0;
117 bbno--) {
118 error = xfs_rtget_summary(omp, tp, log, bbno, &bp,
119 &sumbno, &sum);
120 if (error)
121 return error;
122 if (sum == 0)
123 continue;
124 error = xfs_rtmodify_summary(omp, tp, log, bbno, -sum,
125 &bp, &sumbno);
126 if (error)
127 return error;
128 error = xfs_rtmodify_summary(nmp, tp, log, bbno, sum,
129 &bp, &sumbno);
130 if (error)
131 return error;
132 ASSERT(sum > 0);
133 }
134 }
135 return 0;
136}
137/*
138 * Mark an extent specified by start and len allocated.
139 * Updates all the summary information as well as the bitmap.
140 */
141STATIC int /* error */
142xfs_rtallocate_range(
143 xfs_mount_t *mp, /* file system mount point */
144 xfs_trans_t *tp, /* transaction pointer */
145 xfs_rtblock_t start, /* start block to allocate */
146 xfs_extlen_t len, /* length to allocate */
147 struct xfs_buf **rbpp, /* in/out: summary block buffer */
148 xfs_fsblock_t *rsb) /* in/out: summary block number */
149{
150 xfs_rtblock_t end; /* end of the allocated extent */
151 int error; /* error value */
152 xfs_rtblock_t postblock = 0; /* first block allocated > end */
153 xfs_rtblock_t preblock = 0; /* first block allocated < start */
154
155 end = start + len - 1;
156 /*
157 * Assume we're allocating out of the middle of a free extent.
158 * We need to find the beginning and end of the extent so we can
159 * properly update the summary.
160 */
161 error = xfs_rtfind_back(mp, tp, start, 0, &preblock);
162 if (error) {
163 return error;
164 }
165 /*
166 * Find the next allocated block (end of free extent).
167 */
168 error = xfs_rtfind_forw(mp, tp, end, mp->m_sb.sb_rextents - 1,
169 &postblock);
170 if (error) {
171 return error;
172 }
173 /*
174 * Decrement the summary information corresponding to the entire
175 * (old) free extent.
176 */
177 error = xfs_rtmodify_summary(mp, tp,
178 XFS_RTBLOCKLOG(postblock + 1 - preblock),
179 XFS_BITTOBLOCK(mp, preblock), -1, rbpp, rsb);
180 if (error) {
181 return error;
182 }
183 /*
184 * If there are blocks not being allocated at the front of the
185 * old extent, add summary data for them to be free.
186 */
187 if (preblock < start) {
188 error = xfs_rtmodify_summary(mp, tp,
189 XFS_RTBLOCKLOG(start - preblock),
190 XFS_BITTOBLOCK(mp, preblock), 1, rbpp, rsb);
191 if (error) {
192 return error;
193 }
194 }
195 /*
196 * If there are blocks not being allocated at the end of the
197 * old extent, add summary data for them to be free.
198 */
199 if (postblock > end) {
200 error = xfs_rtmodify_summary(mp, tp,
201 XFS_RTBLOCKLOG(postblock - end),
202 XFS_BITTOBLOCK(mp, end + 1), 1, rbpp, rsb);
203 if (error) {
204 return error;
205 }
206 }
207 /*
208 * Modify the bitmap to mark this extent allocated.
209 */
210 error = xfs_rtmodify_range(mp, tp, start, len, 0);
211 return error;
212}
213
214/*
215 * Attempt to allocate an extent minlen<=len<=maxlen starting from
216 * bitmap block bbno. If we don't get maxlen then use prod to trim
217 * the length, if given. Returns error; returns starting block in *rtblock.
218 * The lengths are all in rtextents.
219 */
220STATIC int /* error */
221xfs_rtallocate_extent_block(
222 xfs_mount_t *mp, /* file system mount point */
223 xfs_trans_t *tp, /* transaction pointer */
224 xfs_rtblock_t bbno, /* bitmap block number */
225 xfs_extlen_t minlen, /* minimum length to allocate */
226 xfs_extlen_t maxlen, /* maximum length to allocate */
227 xfs_extlen_t *len, /* out: actual length allocated */
228 xfs_rtblock_t *nextp, /* out: next block to try */
229 struct xfs_buf **rbpp, /* in/out: summary block buffer */
230 xfs_fsblock_t *rsb, /* in/out: summary block number */
231 xfs_extlen_t prod, /* extent product factor */
232 xfs_rtblock_t *rtblock) /* out: start block allocated */
233{
234 xfs_rtblock_t besti; /* best rtblock found so far */
235 xfs_rtblock_t bestlen; /* best length found so far */
236 xfs_rtblock_t end; /* last rtblock in chunk */
237 int error; /* error value */
238 xfs_rtblock_t i; /* current rtblock trying */
239 xfs_rtblock_t next; /* next rtblock to try */
240 int stat; /* status from internal calls */
241
242 /*
243 * Loop over all the extents starting in this bitmap block,
244 * looking for one that's long enough.
245 */
246 for (i = XFS_BLOCKTOBIT(mp, bbno), besti = -1, bestlen = 0,
247 end = XFS_BLOCKTOBIT(mp, bbno + 1) - 1;
248 i <= end;
249 i++) {
250 /* Make sure we don't scan off the end of the rt volume. */
251 maxlen = min(mp->m_sb.sb_rextents, i + maxlen) - i;
252
253 /*
254 * See if there's a free extent of maxlen starting at i.
255 * If it's not so then next will contain the first non-free.
256 */
257 error = xfs_rtcheck_range(mp, tp, i, maxlen, 1, &next, &stat);
258 if (error) {
259 return error;
260 }
261 if (stat) {
262 /*
263 * i for maxlen is all free, allocate and return that.
264 */
265 error = xfs_rtallocate_range(mp, tp, i, maxlen, rbpp,
266 rsb);
267 if (error) {
268 return error;
269 }
270 *len = maxlen;
271 *rtblock = i;
272 return 0;
273 }
274 /*
275 * In the case where we have a variable-sized allocation
276 * request, figure out how big this free piece is,
277 * and if it's big enough for the minimum, and the best
278 * so far, remember it.
279 */
280 if (minlen < maxlen) {
281 xfs_rtblock_t thislen; /* this extent size */
282
283 thislen = next - i;
284 if (thislen >= minlen && thislen > bestlen) {
285 besti = i;
286 bestlen = thislen;
287 }
288 }
289 /*
290 * If not done yet, find the start of the next free space.
291 */
292 if (next < end) {
293 error = xfs_rtfind_forw(mp, tp, next, end, &i);
294 if (error) {
295 return error;
296 }
297 } else
298 break;
299 }
300 /*
301 * Searched the whole thing & didn't find a maxlen free extent.
302 */
303 if (minlen < maxlen && besti != -1) {
304 xfs_extlen_t p; /* amount to trim length by */
305
306 /*
307 * If size should be a multiple of prod, make that so.
308 */
309 if (prod > 1) {
310 div_u64_rem(bestlen, prod, &p);
311 if (p)
312 bestlen -= p;
313 }
314
315 /*
316 * Allocate besti for bestlen & return that.
317 */
318 error = xfs_rtallocate_range(mp, tp, besti, bestlen, rbpp, rsb);
319 if (error) {
320 return error;
321 }
322 *len = bestlen;
323 *rtblock = besti;
324 return 0;
325 }
326 /*
327 * Allocation failed. Set *nextp to the next block to try.
328 */
329 *nextp = next;
330 *rtblock = NULLRTBLOCK;
331 return 0;
332}
333
334/*
335 * Allocate an extent of length minlen<=len<=maxlen, starting at block
336 * bno. If we don't get maxlen then use prod to trim the length, if given.
337 * Returns error; returns starting block in *rtblock.
338 * The lengths are all in rtextents.
339 */
340STATIC int /* error */
341xfs_rtallocate_extent_exact(
342 xfs_mount_t *mp, /* file system mount point */
343 xfs_trans_t *tp, /* transaction pointer */
344 xfs_rtblock_t bno, /* starting block number to allocate */
345 xfs_extlen_t minlen, /* minimum length to allocate */
346 xfs_extlen_t maxlen, /* maximum length to allocate */
347 xfs_extlen_t *len, /* out: actual length allocated */
348 struct xfs_buf **rbpp, /* in/out: summary block buffer */
349 xfs_fsblock_t *rsb, /* in/out: summary block number */
350 xfs_extlen_t prod, /* extent product factor */
351 xfs_rtblock_t *rtblock) /* out: start block allocated */
352{
353 int error; /* error value */
354 xfs_extlen_t i; /* extent length trimmed due to prod */
355 int isfree; /* extent is free */
356 xfs_rtblock_t next; /* next block to try (dummy) */
357
358 ASSERT(minlen % prod == 0 && maxlen % prod == 0);
359 /*
360 * Check if the range in question (for maxlen) is free.
361 */
362 error = xfs_rtcheck_range(mp, tp, bno, maxlen, 1, &next, &isfree);
363 if (error) {
364 return error;
365 }
366 if (isfree) {
367 /*
368 * If it is, allocate it and return success.
369 */
370 error = xfs_rtallocate_range(mp, tp, bno, maxlen, rbpp, rsb);
371 if (error) {
372 return error;
373 }
374 *len = maxlen;
375 *rtblock = bno;
376 return 0;
377 }
378 /*
379 * If not, allocate what there is, if it's at least minlen.
380 */
381 maxlen = next - bno;
382 if (maxlen < minlen) {
383 /*
384 * Failed, return failure status.
385 */
386 *rtblock = NULLRTBLOCK;
387 return 0;
388 }
389 /*
390 * Trim off tail of extent, if prod is specified.
391 */
392 if (prod > 1 && (i = maxlen % prod)) {
393 maxlen -= i;
394 if (maxlen < minlen) {
395 /*
396 * Now we can't do it, return failure status.
397 */
398 *rtblock = NULLRTBLOCK;
399 return 0;
400 }
401 }
402 /*
403 * Allocate what we can and return it.
404 */
405 error = xfs_rtallocate_range(mp, tp, bno, maxlen, rbpp, rsb);
406 if (error) {
407 return error;
408 }
409 *len = maxlen;
410 *rtblock = bno;
411 return 0;
412}
413
414/*
415 * Allocate an extent of length minlen<=len<=maxlen, starting as near
416 * to bno as possible. If we don't get maxlen then use prod to trim
417 * the length, if given. The lengths are all in rtextents.
418 */
419STATIC int /* error */
420xfs_rtallocate_extent_near(
421 xfs_mount_t *mp, /* file system mount point */
422 xfs_trans_t *tp, /* transaction pointer */
423 xfs_rtblock_t bno, /* starting block number to allocate */
424 xfs_extlen_t minlen, /* minimum length to allocate */
425 xfs_extlen_t maxlen, /* maximum length to allocate */
426 xfs_extlen_t *len, /* out: actual length allocated */
427 struct xfs_buf **rbpp, /* in/out: summary block buffer */
428 xfs_fsblock_t *rsb, /* in/out: summary block number */
429 xfs_extlen_t prod, /* extent product factor */
430 xfs_rtblock_t *rtblock) /* out: start block allocated */
431{
432 int any; /* any useful extents from summary */
433 xfs_rtblock_t bbno; /* bitmap block number */
434 int error; /* error value */
435 int i; /* bitmap block offset (loop control) */
436 int j; /* secondary loop control */
437 int log2len; /* log2 of minlen */
438 xfs_rtblock_t n; /* next block to try */
439 xfs_rtblock_t r; /* result block */
440
441 ASSERT(minlen % prod == 0 && maxlen % prod == 0);
442 /*
443 * If the block number given is off the end, silently set it to
444 * the last block.
445 */
446 if (bno >= mp->m_sb.sb_rextents)
447 bno = mp->m_sb.sb_rextents - 1;
448
449 /* Make sure we don't run off the end of the rt volume. */
450 maxlen = min(mp->m_sb.sb_rextents, bno + maxlen) - bno;
451 if (maxlen < minlen) {
452 *rtblock = NULLRTBLOCK;
453 return 0;
454 }
455
456 /*
457 * Try the exact allocation first.
458 */
459 error = xfs_rtallocate_extent_exact(mp, tp, bno, minlen, maxlen, len,
460 rbpp, rsb, prod, &r);
461 if (error) {
462 return error;
463 }
464 /*
465 * If the exact allocation worked, return that.
466 */
467 if (r != NULLRTBLOCK) {
468 *rtblock = r;
469 return 0;
470 }
471 bbno = XFS_BITTOBLOCK(mp, bno);
472 i = 0;
473 ASSERT(minlen != 0);
474 log2len = xfs_highbit32(minlen);
475 /*
476 * Loop over all bitmap blocks (bbno + i is current block).
477 */
478 for (;;) {
479 /*
480 * Get summary information of extents of all useful levels
481 * starting in this bitmap block.
482 */
483 error = xfs_rtany_summary(mp, tp, log2len, mp->m_rsumlevels - 1,
484 bbno + i, rbpp, rsb, &any);
485 if (error) {
486 return error;
487 }
488 /*
489 * If there are any useful extents starting here, try
490 * allocating one.
491 */
492 if (any) {
493 /*
494 * On the positive side of the starting location.
495 */
496 if (i >= 0) {
497 /*
498 * Try to allocate an extent starting in
499 * this block.
500 */
501 error = xfs_rtallocate_extent_block(mp, tp,
502 bbno + i, minlen, maxlen, len, &n, rbpp,
503 rsb, prod, &r);
504 if (error) {
505 return error;
506 }
507 /*
508 * If it worked, return it.
509 */
510 if (r != NULLRTBLOCK) {
511 *rtblock = r;
512 return 0;
513 }
514 }
515 /*
516 * On the negative side of the starting location.
517 */
518 else { /* i < 0 */
519 /*
520 * Loop backwards through the bitmap blocks from
521 * the starting point-1 up to where we are now.
522 * There should be an extent which ends in this
523 * bitmap block and is long enough.
524 */
525 for (j = -1; j > i; j--) {
526 /*
527 * Grab the summary information for
528 * this bitmap block.
529 */
530 error = xfs_rtany_summary(mp, tp,
531 log2len, mp->m_rsumlevels - 1,
532 bbno + j, rbpp, rsb, &any);
533 if (error) {
534 return error;
535 }
536 /*
537 * If there's no extent given in the
538 * summary that means the extent we
539 * found must carry over from an
540 * earlier block. If there is an
541 * extent given, we've already tried
542 * that allocation, don't do it again.
543 */
544 if (any)
545 continue;
546 error = xfs_rtallocate_extent_block(mp,
547 tp, bbno + j, minlen, maxlen,
548 len, &n, rbpp, rsb, prod, &r);
549 if (error) {
550 return error;
551 }
552 /*
553 * If it works, return the extent.
554 */
555 if (r != NULLRTBLOCK) {
556 *rtblock = r;
557 return 0;
558 }
559 }
560 /*
561 * There weren't intervening bitmap blocks
562 * with a long enough extent, or the
563 * allocation didn't work for some reason
564 * (i.e. it's a little * too short).
565 * Try to allocate from the summary block
566 * that we found.
567 */
568 error = xfs_rtallocate_extent_block(mp, tp,
569 bbno + i, minlen, maxlen, len, &n, rbpp,
570 rsb, prod, &r);
571 if (error) {
572 return error;
573 }
574 /*
575 * If it works, return the extent.
576 */
577 if (r != NULLRTBLOCK) {
578 *rtblock = r;
579 return 0;
580 }
581 }
582 }
583 /*
584 * Loop control. If we were on the positive side, and there's
585 * still more blocks on the negative side, go there.
586 */
587 if (i > 0 && (int)bbno - i >= 0)
588 i = -i;
589 /*
590 * If positive, and no more negative, but there are more
591 * positive, go there.
592 */
593 else if (i > 0 && (int)bbno + i < mp->m_sb.sb_rbmblocks - 1)
594 i++;
595 /*
596 * If negative or 0 (just started), and there are positive
597 * blocks to go, go there. The 0 case moves to block 1.
598 */
599 else if (i <= 0 && (int)bbno - i < mp->m_sb.sb_rbmblocks - 1)
600 i = 1 - i;
601 /*
602 * If negative or 0 and there are more negative blocks,
603 * go there.
604 */
605 else if (i <= 0 && (int)bbno + i > 0)
606 i--;
607 /*
608 * Must be done. Return failure.
609 */
610 else
611 break;
612 }
613 *rtblock = NULLRTBLOCK;
614 return 0;
615}
616
617/*
618 * Allocate an extent of length minlen<=len<=maxlen, with no position
619 * specified. If we don't get maxlen then use prod to trim
620 * the length, if given. The lengths are all in rtextents.
621 */
622STATIC int /* error */
623xfs_rtallocate_extent_size(
624 xfs_mount_t *mp, /* file system mount point */
625 xfs_trans_t *tp, /* transaction pointer */
626 xfs_extlen_t minlen, /* minimum length to allocate */
627 xfs_extlen_t maxlen, /* maximum length to allocate */
628 xfs_extlen_t *len, /* out: actual length allocated */
629 struct xfs_buf **rbpp, /* in/out: summary block buffer */
630 xfs_fsblock_t *rsb, /* in/out: summary block number */
631 xfs_extlen_t prod, /* extent product factor */
632 xfs_rtblock_t *rtblock) /* out: start block allocated */
633{
634 int error; /* error value */
635 int i; /* bitmap block number */
636 int l; /* level number (loop control) */
637 xfs_rtblock_t n; /* next block to be tried */
638 xfs_rtblock_t r; /* result block number */
639 xfs_suminfo_t sum; /* summary information for extents */
640
641 ASSERT(minlen % prod == 0 && maxlen % prod == 0);
642 ASSERT(maxlen != 0);
643
644 /*
645 * Loop over all the levels starting with maxlen.
646 * At each level, look at all the bitmap blocks, to see if there
647 * are extents starting there that are long enough (>= maxlen).
648 * Note, only on the initial level can the allocation fail if
649 * the summary says there's an extent.
650 */
651 for (l = xfs_highbit32(maxlen); l < mp->m_rsumlevels; l++) {
652 /*
653 * Loop over all the bitmap blocks.
654 */
655 for (i = 0; i < mp->m_sb.sb_rbmblocks; i++) {
656 /*
657 * Get the summary for this level/block.
658 */
659 error = xfs_rtget_summary(mp, tp, l, i, rbpp, rsb,
660 &sum);
661 if (error) {
662 return error;
663 }
664 /*
665 * Nothing there, on to the next block.
666 */
667 if (!sum)
668 continue;
669 /*
670 * Try allocating the extent.
671 */
672 error = xfs_rtallocate_extent_block(mp, tp, i, maxlen,
673 maxlen, len, &n, rbpp, rsb, prod, &r);
674 if (error) {
675 return error;
676 }
677 /*
678 * If it worked, return that.
679 */
680 if (r != NULLRTBLOCK) {
681 *rtblock = r;
682 return 0;
683 }
684 /*
685 * If the "next block to try" returned from the
686 * allocator is beyond the next bitmap block,
687 * skip to that bitmap block.
688 */
689 if (XFS_BITTOBLOCK(mp, n) > i + 1)
690 i = XFS_BITTOBLOCK(mp, n) - 1;
691 }
692 }
693 /*
694 * Didn't find any maxlen blocks. Try smaller ones, unless
695 * we're asking for a fixed size extent.
696 */
697 if (minlen > --maxlen) {
698 *rtblock = NULLRTBLOCK;
699 return 0;
700 }
701 ASSERT(minlen != 0);
702 ASSERT(maxlen != 0);
703
704 /*
705 * Loop over sizes, from maxlen down to minlen.
706 * This time, when we do the allocations, allow smaller ones
707 * to succeed.
708 */
709 for (l = xfs_highbit32(maxlen); l >= xfs_highbit32(minlen); l--) {
710 /*
711 * Loop over all the bitmap blocks, try an allocation
712 * starting in that block.
713 */
714 for (i = 0; i < mp->m_sb.sb_rbmblocks; i++) {
715 /*
716 * Get the summary information for this level/block.
717 */
718 error = xfs_rtget_summary(mp, tp, l, i, rbpp, rsb,
719 &sum);
720 if (error) {
721 return error;
722 }
723 /*
724 * If nothing there, go on to next.
725 */
726 if (!sum)
727 continue;
728 /*
729 * Try the allocation. Make sure the specified
730 * minlen/maxlen are in the possible range for
731 * this summary level.
732 */
733 error = xfs_rtallocate_extent_block(mp, tp, i,
734 XFS_RTMAX(minlen, 1 << l),
735 XFS_RTMIN(maxlen, (1 << (l + 1)) - 1),
736 len, &n, rbpp, rsb, prod, &r);
737 if (error) {
738 return error;
739 }
740 /*
741 * If it worked, return that extent.
742 */
743 if (r != NULLRTBLOCK) {
744 *rtblock = r;
745 return 0;
746 }
747 /*
748 * If the "next block to try" returned from the
749 * allocator is beyond the next bitmap block,
750 * skip to that bitmap block.
751 */
752 if (XFS_BITTOBLOCK(mp, n) > i + 1)
753 i = XFS_BITTOBLOCK(mp, n) - 1;
754 }
755 }
756 /*
757 * Got nothing, return failure.
758 */
759 *rtblock = NULLRTBLOCK;
760 return 0;
761}
762
763/*
764 * Allocate space to the bitmap or summary file, and zero it, for growfs.
765 */
766STATIC int
767xfs_growfs_rt_alloc(
768 struct xfs_mount *mp, /* file system mount point */
769 xfs_extlen_t oblocks, /* old count of blocks */
770 xfs_extlen_t nblocks, /* new count of blocks */
771 struct xfs_inode *ip) /* inode (bitmap/summary) */
772{
773 xfs_fileoff_t bno; /* block number in file */
774 struct xfs_buf *bp; /* temporary buffer for zeroing */
775 xfs_daddr_t d; /* disk block address */
776 int error; /* error return value */
777 xfs_fsblock_t fsbno; /* filesystem block for bno */
778 struct xfs_bmbt_irec map; /* block map output */
779 int nmap; /* number of block maps */
780 int resblks; /* space reservation */
781 enum xfs_blft buf_type;
782 struct xfs_trans *tp;
783
784 if (ip == mp->m_rsumip)
785 buf_type = XFS_BLFT_RTSUMMARY_BUF;
786 else
787 buf_type = XFS_BLFT_RTBITMAP_BUF;
788
789 /*
790 * Allocate space to the file, as necessary.
791 */
792 while (oblocks < nblocks) {
793 resblks = XFS_GROWFSRT_SPACE_RES(mp, nblocks - oblocks);
794 /*
795 * Reserve space & log for one extent added to the file.
796 */
797 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growrtalloc, resblks,
798 0, 0, &tp);
799 if (error)
800 return error;
801 /*
802 * Lock the inode.
803 */
804 xfs_ilock(ip, XFS_ILOCK_EXCL);
805 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
806
807 error = xfs_iext_count_may_overflow(ip, XFS_DATA_FORK,
808 XFS_IEXT_ADD_NOSPLIT_CNT);
809 if (error == -EFBIG)
810 error = xfs_iext_count_upgrade(tp, ip,
811 XFS_IEXT_ADD_NOSPLIT_CNT);
812 if (error)
813 goto out_trans_cancel;
814
815 /*
816 * Allocate blocks to the bitmap file.
817 */
818 nmap = 1;
819 error = xfs_bmapi_write(tp, ip, oblocks, nblocks - oblocks,
820 XFS_BMAPI_METADATA, 0, &map, &nmap);
821 if (!error && nmap < 1)
822 error = -ENOSPC;
823 if (error)
824 goto out_trans_cancel;
825 /*
826 * Free any blocks freed up in the transaction, then commit.
827 */
828 error = xfs_trans_commit(tp);
829 if (error)
830 return error;
831 /*
832 * Now we need to clear the allocated blocks.
833 * Do this one block per transaction, to keep it simple.
834 */
835 for (bno = map.br_startoff, fsbno = map.br_startblock;
836 bno < map.br_startoff + map.br_blockcount;
837 bno++, fsbno++) {
838 /*
839 * Reserve log for one block zeroing.
840 */
841 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growrtzero,
842 0, 0, 0, &tp);
843 if (error)
844 return error;
845 /*
846 * Lock the bitmap inode.
847 */
848 xfs_ilock(ip, XFS_ILOCK_EXCL);
849 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
850 /*
851 * Get a buffer for the block.
852 */
853 d = XFS_FSB_TO_DADDR(mp, fsbno);
854 error = xfs_trans_get_buf(tp, mp->m_ddev_targp, d,
855 mp->m_bsize, 0, &bp);
856 if (error)
857 goto out_trans_cancel;
858
859 xfs_trans_buf_set_type(tp, bp, buf_type);
860 bp->b_ops = &xfs_rtbuf_ops;
861 memset(bp->b_addr, 0, mp->m_sb.sb_blocksize);
862 xfs_trans_log_buf(tp, bp, 0, mp->m_sb.sb_blocksize - 1);
863 /*
864 * Commit the transaction.
865 */
866 error = xfs_trans_commit(tp);
867 if (error)
868 return error;
869 }
870 /*
871 * Go on to the next extent, if any.
872 */
873 oblocks = map.br_startoff + map.br_blockcount;
874 }
875
876 return 0;
877
878out_trans_cancel:
879 xfs_trans_cancel(tp);
880 return error;
881}
882
883static void
884xfs_alloc_rsum_cache(
885 xfs_mount_t *mp, /* file system mount structure */
886 xfs_extlen_t rbmblocks) /* number of rt bitmap blocks */
887{
888 /*
889 * The rsum cache is initialized to all zeroes, which is trivially a
890 * lower bound on the minimum level with any free extents. We can
891 * continue without the cache if it couldn't be allocated.
892 */
893 mp->m_rsum_cache = kvzalloc(rbmblocks, GFP_KERNEL);
894 if (!mp->m_rsum_cache)
895 xfs_warn(mp, "could not allocate realtime summary cache");
896}
897
898/*
899 * Visible (exported) functions.
900 */
901
902/*
903 * Grow the realtime area of the filesystem.
904 */
905int
906xfs_growfs_rt(
907 xfs_mount_t *mp, /* mount point for filesystem */
908 xfs_growfs_rt_t *in) /* growfs rt input struct */
909{
910 xfs_rtblock_t bmbno; /* bitmap block number */
911 struct xfs_buf *bp; /* temporary buffer */
912 int error; /* error return value */
913 xfs_mount_t *nmp; /* new (fake) mount structure */
914 xfs_rfsblock_t nrblocks; /* new number of realtime blocks */
915 xfs_extlen_t nrbmblocks; /* new number of rt bitmap blocks */
916 xfs_rtblock_t nrextents; /* new number of realtime extents */
917 uint8_t nrextslog; /* new log2 of sb_rextents */
918 xfs_extlen_t nrsumblocks; /* new number of summary blocks */
919 uint nrsumlevels; /* new rt summary levels */
920 uint nrsumsize; /* new size of rt summary, bytes */
921 xfs_sb_t *nsbp; /* new superblock */
922 xfs_extlen_t rbmblocks; /* current number of rt bitmap blocks */
923 xfs_extlen_t rsumblocks; /* current number of rt summary blks */
924 xfs_sb_t *sbp; /* old superblock */
925 xfs_fsblock_t sumbno; /* summary block number */
926 uint8_t *rsum_cache; /* old summary cache */
927
928 sbp = &mp->m_sb;
929
930 if (!capable(CAP_SYS_ADMIN))
931 return -EPERM;
932
933 /* Needs to have been mounted with an rt device. */
934 if (!XFS_IS_REALTIME_MOUNT(mp))
935 return -EINVAL;
936 /*
937 * Mount should fail if the rt bitmap/summary files don't load, but
938 * we'll check anyway.
939 */
940 if (!mp->m_rbmip || !mp->m_rsumip)
941 return -EINVAL;
942
943 /* Shrink not supported. */
944 if (in->newblocks <= sbp->sb_rblocks)
945 return -EINVAL;
946
947 /* Can only change rt extent size when adding rt volume. */
948 if (sbp->sb_rblocks > 0 && in->extsize != sbp->sb_rextsize)
949 return -EINVAL;
950
951 /* Range check the extent size. */
952 if (XFS_FSB_TO_B(mp, in->extsize) > XFS_MAX_RTEXTSIZE ||
953 XFS_FSB_TO_B(mp, in->extsize) < XFS_MIN_RTEXTSIZE)
954 return -EINVAL;
955
956 /* Unsupported realtime features. */
957 if (xfs_has_rmapbt(mp) || xfs_has_reflink(mp))
958 return -EOPNOTSUPP;
959
960 nrblocks = in->newblocks;
961 error = xfs_sb_validate_fsb_count(sbp, nrblocks);
962 if (error)
963 return error;
964 /*
965 * Read in the last block of the device, make sure it exists.
966 */
967 error = xfs_buf_read_uncached(mp->m_rtdev_targp,
968 XFS_FSB_TO_BB(mp, nrblocks - 1),
969 XFS_FSB_TO_BB(mp, 1), 0, &bp, NULL);
970 if (error)
971 return error;
972 xfs_buf_relse(bp);
973
974 /*
975 * Calculate new parameters. These are the final values to be reached.
976 */
977 nrextents = nrblocks;
978 do_div(nrextents, in->extsize);
979 nrbmblocks = howmany_64(nrextents, NBBY * sbp->sb_blocksize);
980 nrextslog = xfs_highbit32(nrextents);
981 nrsumlevels = nrextslog + 1;
982 nrsumsize = (uint)sizeof(xfs_suminfo_t) * nrsumlevels * nrbmblocks;
983 nrsumblocks = XFS_B_TO_FSB(mp, nrsumsize);
984 nrsumsize = XFS_FSB_TO_B(mp, nrsumblocks);
985 /*
986 * New summary size can't be more than half the size of
987 * the log. This prevents us from getting a log overflow,
988 * since we'll log basically the whole summary file at once.
989 */
990 if (nrsumblocks > (mp->m_sb.sb_logblocks >> 1))
991 return -EINVAL;
992 /*
993 * Get the old block counts for bitmap and summary inodes.
994 * These can't change since other growfs callers are locked out.
995 */
996 rbmblocks = XFS_B_TO_FSB(mp, mp->m_rbmip->i_disk_size);
997 rsumblocks = XFS_B_TO_FSB(mp, mp->m_rsumip->i_disk_size);
998 /*
999 * Allocate space to the bitmap and summary files, as necessary.
1000 */
1001 error = xfs_growfs_rt_alloc(mp, rbmblocks, nrbmblocks, mp->m_rbmip);
1002 if (error)
1003 return error;
1004 error = xfs_growfs_rt_alloc(mp, rsumblocks, nrsumblocks, mp->m_rsumip);
1005 if (error)
1006 return error;
1007
1008 rsum_cache = mp->m_rsum_cache;
1009 if (nrbmblocks != sbp->sb_rbmblocks)
1010 xfs_alloc_rsum_cache(mp, nrbmblocks);
1011
1012 /*
1013 * Allocate a new (fake) mount/sb.
1014 */
1015 nmp = kmem_alloc(sizeof(*nmp), 0);
1016 /*
1017 * Loop over the bitmap blocks.
1018 * We will do everything one bitmap block at a time.
1019 * Skip the current block if it is exactly full.
1020 * This also deals with the case where there were no rtextents before.
1021 */
1022 for (bmbno = sbp->sb_rbmblocks -
1023 ((sbp->sb_rextents & ((1 << mp->m_blkbit_log) - 1)) != 0);
1024 bmbno < nrbmblocks;
1025 bmbno++) {
1026 struct xfs_trans *tp;
1027 xfs_rfsblock_t nrblocks_step;
1028
1029 *nmp = *mp;
1030 nsbp = &nmp->m_sb;
1031 /*
1032 * Calculate new sb and mount fields for this round.
1033 */
1034 nsbp->sb_rextsize = in->extsize;
1035 nsbp->sb_rbmblocks = bmbno + 1;
1036 nrblocks_step = (bmbno + 1) * NBBY * nsbp->sb_blocksize *
1037 nsbp->sb_rextsize;
1038 nsbp->sb_rblocks = min(nrblocks, nrblocks_step);
1039 nsbp->sb_rextents = nsbp->sb_rblocks;
1040 do_div(nsbp->sb_rextents, nsbp->sb_rextsize);
1041 ASSERT(nsbp->sb_rextents != 0);
1042 nsbp->sb_rextslog = xfs_highbit32(nsbp->sb_rextents);
1043 nrsumlevels = nmp->m_rsumlevels = nsbp->sb_rextslog + 1;
1044 nrsumsize =
1045 (uint)sizeof(xfs_suminfo_t) * nrsumlevels *
1046 nsbp->sb_rbmblocks;
1047 nrsumblocks = XFS_B_TO_FSB(mp, nrsumsize);
1048 nmp->m_rsumsize = nrsumsize = XFS_FSB_TO_B(mp, nrsumblocks);
1049 /*
1050 * Start a transaction, get the log reservation.
1051 */
1052 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growrtfree, 0, 0, 0,
1053 &tp);
1054 if (error)
1055 break;
1056 /*
1057 * Lock out other callers by grabbing the bitmap inode lock.
1058 */
1059 xfs_ilock(mp->m_rbmip, XFS_ILOCK_EXCL | XFS_ILOCK_RTBITMAP);
1060 xfs_trans_ijoin(tp, mp->m_rbmip, XFS_ILOCK_EXCL);
1061 /*
1062 * Update the bitmap inode's size ondisk and incore. We need
1063 * to update the incore size so that inode inactivation won't
1064 * punch what it thinks are "posteof" blocks.
1065 */
1066 mp->m_rbmip->i_disk_size =
1067 nsbp->sb_rbmblocks * nsbp->sb_blocksize;
1068 i_size_write(VFS_I(mp->m_rbmip), mp->m_rbmip->i_disk_size);
1069 xfs_trans_log_inode(tp, mp->m_rbmip, XFS_ILOG_CORE);
1070 /*
1071 * Get the summary inode into the transaction.
1072 */
1073 xfs_ilock(mp->m_rsumip, XFS_ILOCK_EXCL | XFS_ILOCK_RTSUM);
1074 xfs_trans_ijoin(tp, mp->m_rsumip, XFS_ILOCK_EXCL);
1075 /*
1076 * Update the summary inode's size. We need to update the
1077 * incore size so that inode inactivation won't punch what it
1078 * thinks are "posteof" blocks.
1079 */
1080 mp->m_rsumip->i_disk_size = nmp->m_rsumsize;
1081 i_size_write(VFS_I(mp->m_rsumip), mp->m_rsumip->i_disk_size);
1082 xfs_trans_log_inode(tp, mp->m_rsumip, XFS_ILOG_CORE);
1083 /*
1084 * Copy summary data from old to new sizes.
1085 * Do this when the real size (not block-aligned) changes.
1086 */
1087 if (sbp->sb_rbmblocks != nsbp->sb_rbmblocks ||
1088 mp->m_rsumlevels != nmp->m_rsumlevels) {
1089 error = xfs_rtcopy_summary(mp, nmp, tp);
1090 if (error)
1091 goto error_cancel;
1092 }
1093 /*
1094 * Update superblock fields.
1095 */
1096 if (nsbp->sb_rextsize != sbp->sb_rextsize)
1097 xfs_trans_mod_sb(tp, XFS_TRANS_SB_REXTSIZE,
1098 nsbp->sb_rextsize - sbp->sb_rextsize);
1099 if (nsbp->sb_rbmblocks != sbp->sb_rbmblocks)
1100 xfs_trans_mod_sb(tp, XFS_TRANS_SB_RBMBLOCKS,
1101 nsbp->sb_rbmblocks - sbp->sb_rbmblocks);
1102 if (nsbp->sb_rblocks != sbp->sb_rblocks)
1103 xfs_trans_mod_sb(tp, XFS_TRANS_SB_RBLOCKS,
1104 nsbp->sb_rblocks - sbp->sb_rblocks);
1105 if (nsbp->sb_rextents != sbp->sb_rextents)
1106 xfs_trans_mod_sb(tp, XFS_TRANS_SB_REXTENTS,
1107 nsbp->sb_rextents - sbp->sb_rextents);
1108 if (nsbp->sb_rextslog != sbp->sb_rextslog)
1109 xfs_trans_mod_sb(tp, XFS_TRANS_SB_REXTSLOG,
1110 nsbp->sb_rextslog - sbp->sb_rextslog);
1111 /*
1112 * Free new extent.
1113 */
1114 bp = NULL;
1115 error = xfs_rtfree_range(nmp, tp, sbp->sb_rextents,
1116 nsbp->sb_rextents - sbp->sb_rextents, &bp, &sumbno);
1117 if (error) {
1118error_cancel:
1119 xfs_trans_cancel(tp);
1120 break;
1121 }
1122 /*
1123 * Mark more blocks free in the superblock.
1124 */
1125 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FREXTENTS,
1126 nsbp->sb_rextents - sbp->sb_rextents);
1127 /*
1128 * Update mp values into the real mp structure.
1129 */
1130 mp->m_rsumlevels = nrsumlevels;
1131 mp->m_rsumsize = nrsumsize;
1132
1133 error = xfs_trans_commit(tp);
1134 if (error)
1135 break;
1136
1137 /* Ensure the mount RT feature flag is now set. */
1138 mp->m_features |= XFS_FEAT_REALTIME;
1139 }
1140 if (error)
1141 goto out_free;
1142
1143 /* Update secondary superblocks now the physical grow has completed */
1144 error = xfs_update_secondary_sbs(mp);
1145
1146out_free:
1147 /*
1148 * Free the fake mp structure.
1149 */
1150 kmem_free(nmp);
1151
1152 /*
1153 * If we had to allocate a new rsum_cache, we either need to free the
1154 * old one (if we succeeded) or free the new one and restore the old one
1155 * (if there was an error).
1156 */
1157 if (rsum_cache != mp->m_rsum_cache) {
1158 if (error) {
1159 kmem_free(mp->m_rsum_cache);
1160 mp->m_rsum_cache = rsum_cache;
1161 } else {
1162 kmem_free(rsum_cache);
1163 }
1164 }
1165
1166 return error;
1167}
1168
1169/*
1170 * Allocate an extent in the realtime subvolume, with the usual allocation
1171 * parameters. The length units are all in realtime extents, as is the
1172 * result block number.
1173 */
1174int /* error */
1175xfs_rtallocate_extent(
1176 xfs_trans_t *tp, /* transaction pointer */
1177 xfs_rtblock_t bno, /* starting block number to allocate */
1178 xfs_extlen_t minlen, /* minimum length to allocate */
1179 xfs_extlen_t maxlen, /* maximum length to allocate */
1180 xfs_extlen_t *len, /* out: actual length allocated */
1181 int wasdel, /* was a delayed allocation extent */
1182 xfs_extlen_t prod, /* extent product factor */
1183 xfs_rtblock_t *rtblock) /* out: start block allocated */
1184{
1185 xfs_mount_t *mp = tp->t_mountp;
1186 int error; /* error value */
1187 xfs_rtblock_t r; /* result allocated block */
1188 xfs_fsblock_t sb; /* summary file block number */
1189 struct xfs_buf *sumbp; /* summary file block buffer */
1190
1191 ASSERT(xfs_isilocked(mp->m_rbmip, XFS_ILOCK_EXCL));
1192 ASSERT(minlen > 0 && minlen <= maxlen);
1193
1194 /*
1195 * If prod is set then figure out what to do to minlen and maxlen.
1196 */
1197 if (prod > 1) {
1198 xfs_extlen_t i;
1199
1200 if ((i = maxlen % prod))
1201 maxlen -= i;
1202 if ((i = minlen % prod))
1203 minlen += prod - i;
1204 if (maxlen < minlen) {
1205 *rtblock = NULLRTBLOCK;
1206 return 0;
1207 }
1208 }
1209
1210retry:
1211 sumbp = NULL;
1212 if (bno == 0) {
1213 error = xfs_rtallocate_extent_size(mp, tp, minlen, maxlen, len,
1214 &sumbp, &sb, prod, &r);
1215 } else {
1216 error = xfs_rtallocate_extent_near(mp, tp, bno, minlen, maxlen,
1217 len, &sumbp, &sb, prod, &r);
1218 }
1219
1220 if (error)
1221 return error;
1222
1223 /*
1224 * If it worked, update the superblock.
1225 */
1226 if (r != NULLRTBLOCK) {
1227 long slen = (long)*len;
1228
1229 ASSERT(*len >= minlen && *len <= maxlen);
1230 if (wasdel)
1231 xfs_trans_mod_sb(tp, XFS_TRANS_SB_RES_FREXTENTS, -slen);
1232 else
1233 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FREXTENTS, -slen);
1234 } else if (prod > 1) {
1235 prod = 1;
1236 goto retry;
1237 }
1238
1239 *rtblock = r;
1240 return 0;
1241}
1242
1243/*
1244 * Initialize realtime fields in the mount structure.
1245 */
1246int /* error */
1247xfs_rtmount_init(
1248 struct xfs_mount *mp) /* file system mount structure */
1249{
1250 struct xfs_buf *bp; /* buffer for last block of subvolume */
1251 struct xfs_sb *sbp; /* filesystem superblock copy in mount */
1252 xfs_daddr_t d; /* address of last block of subvolume */
1253 int error;
1254
1255 sbp = &mp->m_sb;
1256 if (sbp->sb_rblocks == 0)
1257 return 0;
1258 if (mp->m_rtdev_targp == NULL) {
1259 xfs_warn(mp,
1260 "Filesystem has a realtime volume, use rtdev=device option");
1261 return -ENODEV;
1262 }
1263 mp->m_rsumlevels = sbp->sb_rextslog + 1;
1264 mp->m_rsumsize =
1265 (uint)sizeof(xfs_suminfo_t) * mp->m_rsumlevels *
1266 sbp->sb_rbmblocks;
1267 mp->m_rsumsize = roundup(mp->m_rsumsize, sbp->sb_blocksize);
1268 mp->m_rbmip = mp->m_rsumip = NULL;
1269 /*
1270 * Check that the realtime section is an ok size.
1271 */
1272 d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_rblocks);
1273 if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_rblocks) {
1274 xfs_warn(mp, "realtime mount -- %llu != %llu",
1275 (unsigned long long) XFS_BB_TO_FSB(mp, d),
1276 (unsigned long long) mp->m_sb.sb_rblocks);
1277 return -EFBIG;
1278 }
1279 error = xfs_buf_read_uncached(mp->m_rtdev_targp,
1280 d - XFS_FSB_TO_BB(mp, 1),
1281 XFS_FSB_TO_BB(mp, 1), 0, &bp, NULL);
1282 if (error) {
1283 xfs_warn(mp, "realtime device size check failed");
1284 return error;
1285 }
1286 xfs_buf_relse(bp);
1287 return 0;
1288}
1289
1290static int
1291xfs_rtalloc_count_frextent(
1292 struct xfs_mount *mp,
1293 struct xfs_trans *tp,
1294 const struct xfs_rtalloc_rec *rec,
1295 void *priv)
1296{
1297 uint64_t *valp = priv;
1298
1299 *valp += rec->ar_extcount;
1300 return 0;
1301}
1302
1303/*
1304 * Reinitialize the number of free realtime extents from the realtime bitmap.
1305 * Callers must ensure that there is no other activity in the filesystem.
1306 */
1307int
1308xfs_rtalloc_reinit_frextents(
1309 struct xfs_mount *mp)
1310{
1311 uint64_t val = 0;
1312 int error;
1313
1314 xfs_ilock(mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
1315 error = xfs_rtalloc_query_all(mp, NULL, xfs_rtalloc_count_frextent,
1316 &val);
1317 xfs_iunlock(mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
1318 if (error)
1319 return error;
1320
1321 spin_lock(&mp->m_sb_lock);
1322 mp->m_sb.sb_frextents = val;
1323 spin_unlock(&mp->m_sb_lock);
1324 percpu_counter_set(&mp->m_frextents, mp->m_sb.sb_frextents);
1325 return 0;
1326}
1327
1328/*
1329 * Read in the bmbt of an rt metadata inode so that we never have to load them
1330 * at runtime. This enables the use of shared ILOCKs for rtbitmap scans. Use
1331 * an empty transaction to avoid deadlocking on loops in the bmbt.
1332 */
1333static inline int
1334xfs_rtmount_iread_extents(
1335 struct xfs_inode *ip,
1336 unsigned int lock_class)
1337{
1338 struct xfs_trans *tp;
1339 int error;
1340
1341 error = xfs_trans_alloc_empty(ip->i_mount, &tp);
1342 if (error)
1343 return error;
1344
1345 xfs_ilock(ip, XFS_ILOCK_EXCL | lock_class);
1346
1347 error = xfs_iread_extents(tp, ip, XFS_DATA_FORK);
1348 if (error)
1349 goto out_unlock;
1350
1351 if (xfs_inode_has_attr_fork(ip)) {
1352 error = xfs_iread_extents(tp, ip, XFS_ATTR_FORK);
1353 if (error)
1354 goto out_unlock;
1355 }
1356
1357out_unlock:
1358 xfs_iunlock(ip, XFS_ILOCK_EXCL | lock_class);
1359 xfs_trans_cancel(tp);
1360 return error;
1361}
1362
1363/*
1364 * Get the bitmap and summary inodes and the summary cache into the mount
1365 * structure at mount time.
1366 */
1367int /* error */
1368xfs_rtmount_inodes(
1369 xfs_mount_t *mp) /* file system mount structure */
1370{
1371 int error; /* error return value */
1372 xfs_sb_t *sbp;
1373
1374 sbp = &mp->m_sb;
1375 error = xfs_iget(mp, NULL, sbp->sb_rbmino, 0, 0, &mp->m_rbmip);
1376 if (error)
1377 return error;
1378 ASSERT(mp->m_rbmip != NULL);
1379
1380 error = xfs_rtmount_iread_extents(mp->m_rbmip, XFS_ILOCK_RTBITMAP);
1381 if (error)
1382 goto out_rele_bitmap;
1383
1384 error = xfs_iget(mp, NULL, sbp->sb_rsumino, 0, 0, &mp->m_rsumip);
1385 if (error)
1386 goto out_rele_bitmap;
1387 ASSERT(mp->m_rsumip != NULL);
1388
1389 error = xfs_rtmount_iread_extents(mp->m_rsumip, XFS_ILOCK_RTSUM);
1390 if (error)
1391 goto out_rele_summary;
1392
1393 xfs_alloc_rsum_cache(mp, sbp->sb_rbmblocks);
1394 return 0;
1395
1396out_rele_summary:
1397 xfs_irele(mp->m_rsumip);
1398out_rele_bitmap:
1399 xfs_irele(mp->m_rbmip);
1400 return error;
1401}
1402
1403void
1404xfs_rtunmount_inodes(
1405 struct xfs_mount *mp)
1406{
1407 kmem_free(mp->m_rsum_cache);
1408 if (mp->m_rbmip)
1409 xfs_irele(mp->m_rbmip);
1410 if (mp->m_rsumip)
1411 xfs_irele(mp->m_rsumip);
1412}
1413
1414/*
1415 * Pick an extent for allocation at the start of a new realtime file.
1416 * Use the sequence number stored in the atime field of the bitmap inode.
1417 * Translate this to a fraction of the rtextents, and return the product
1418 * of rtextents and the fraction.
1419 * The fraction sequence is 0, 1/2, 1/4, 3/4, 1/8, ..., 7/8, 1/16, ...
1420 */
1421int /* error */
1422xfs_rtpick_extent(
1423 xfs_mount_t *mp, /* file system mount point */
1424 xfs_trans_t *tp, /* transaction pointer */
1425 xfs_extlen_t len, /* allocation length (rtextents) */
1426 xfs_rtblock_t *pick) /* result rt extent */
1427{
1428 xfs_rtblock_t b; /* result block */
1429 int log2; /* log of sequence number */
1430 uint64_t resid; /* residual after log removed */
1431 uint64_t seq; /* sequence number of file creation */
1432 uint64_t *seqp; /* pointer to seqno in inode */
1433
1434 ASSERT(xfs_isilocked(mp->m_rbmip, XFS_ILOCK_EXCL));
1435
1436 seqp = (uint64_t *)&VFS_I(mp->m_rbmip)->i_atime;
1437 if (!(mp->m_rbmip->i_diflags & XFS_DIFLAG_NEWRTBM)) {
1438 mp->m_rbmip->i_diflags |= XFS_DIFLAG_NEWRTBM;
1439 *seqp = 0;
1440 }
1441 seq = *seqp;
1442 if ((log2 = xfs_highbit64(seq)) == -1)
1443 b = 0;
1444 else {
1445 resid = seq - (1ULL << log2);
1446 b = (mp->m_sb.sb_rextents * ((resid << 1) + 1ULL)) >>
1447 (log2 + 1);
1448 if (b >= mp->m_sb.sb_rextents)
1449 div64_u64_rem(b, mp->m_sb.sb_rextents, &b);
1450 if (b + len > mp->m_sb.sb_rextents)
1451 b = mp->m_sb.sb_rextents - len;
1452 }
1453 *seqp = seq + 1;
1454 xfs_trans_log_inode(tp, mp->m_rbmip, XFS_ILOG_CORE);
1455 *pick = b;
1456 return 0;
1457}
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_shared.h"
21#include "xfs_format.h"
22#include "xfs_log_format.h"
23#include "xfs_trans_resv.h"
24#include "xfs_bit.h"
25#include "xfs_mount.h"
26#include "xfs_inode.h"
27#include "xfs_bmap.h"
28#include "xfs_bmap_util.h"
29#include "xfs_bmap_btree.h"
30#include "xfs_alloc.h"
31#include "xfs_error.h"
32#include "xfs_trans.h"
33#include "xfs_trans_space.h"
34#include "xfs_trace.h"
35#include "xfs_buf.h"
36#include "xfs_icache.h"
37#include "xfs_rtalloc.h"
38
39
40/*
41 * Read and return the summary information for a given extent size,
42 * bitmap block combination.
43 * Keeps track of a current summary block, so we don't keep reading
44 * it from the buffer cache.
45 */
46static int
47xfs_rtget_summary(
48 xfs_mount_t *mp, /* file system mount structure */
49 xfs_trans_t *tp, /* transaction pointer */
50 int log, /* log2 of extent size */
51 xfs_rtblock_t bbno, /* bitmap block number */
52 xfs_buf_t **rbpp, /* in/out: summary block buffer */
53 xfs_fsblock_t *rsb, /* in/out: summary block number */
54 xfs_suminfo_t *sum) /* out: summary info for this block */
55{
56 return xfs_rtmodify_summary_int(mp, tp, log, bbno, 0, rbpp, rsb, sum);
57}
58
59/*
60 * Return whether there are any free extents in the size range given
61 * by low and high, for the bitmap block bbno.
62 */
63STATIC int /* error */
64xfs_rtany_summary(
65 xfs_mount_t *mp, /* file system mount structure */
66 xfs_trans_t *tp, /* transaction pointer */
67 int low, /* low log2 extent size */
68 int high, /* high log2 extent size */
69 xfs_rtblock_t bbno, /* bitmap block number */
70 xfs_buf_t **rbpp, /* in/out: summary block buffer */
71 xfs_fsblock_t *rsb, /* in/out: summary block number */
72 int *stat) /* out: any good extents here? */
73{
74 int error; /* error value */
75 int log; /* loop counter, log2 of ext. size */
76 xfs_suminfo_t sum; /* summary data */
77
78 /*
79 * Loop over logs of extent sizes. Order is irrelevant.
80 */
81 for (log = low; log <= high; log++) {
82 /*
83 * Get one summary datum.
84 */
85 error = xfs_rtget_summary(mp, tp, log, bbno, rbpp, rsb, &sum);
86 if (error) {
87 return error;
88 }
89 /*
90 * If there are any, return success.
91 */
92 if (sum) {
93 *stat = 1;
94 return 0;
95 }
96 }
97 /*
98 * Found nothing, return failure.
99 */
100 *stat = 0;
101 return 0;
102}
103
104
105/*
106 * Copy and transform the summary file, given the old and new
107 * parameters in the mount structures.
108 */
109STATIC int /* error */
110xfs_rtcopy_summary(
111 xfs_mount_t *omp, /* old file system mount point */
112 xfs_mount_t *nmp, /* new file system mount point */
113 xfs_trans_t *tp) /* transaction pointer */
114{
115 xfs_rtblock_t bbno; /* bitmap block number */
116 xfs_buf_t *bp; /* summary buffer */
117 int error; /* error return value */
118 int log; /* summary level number (log length) */
119 xfs_suminfo_t sum; /* summary data */
120 xfs_fsblock_t sumbno; /* summary block number */
121
122 bp = NULL;
123 for (log = omp->m_rsumlevels - 1; log >= 0; log--) {
124 for (bbno = omp->m_sb.sb_rbmblocks - 1;
125 (xfs_srtblock_t)bbno >= 0;
126 bbno--) {
127 error = xfs_rtget_summary(omp, tp, log, bbno, &bp,
128 &sumbno, &sum);
129 if (error)
130 return error;
131 if (sum == 0)
132 continue;
133 error = xfs_rtmodify_summary(omp, tp, log, bbno, -sum,
134 &bp, &sumbno);
135 if (error)
136 return error;
137 error = xfs_rtmodify_summary(nmp, tp, log, bbno, sum,
138 &bp, &sumbno);
139 if (error)
140 return error;
141 ASSERT(sum > 0);
142 }
143 }
144 return 0;
145}
146/*
147 * Mark an extent specified by start and len allocated.
148 * Updates all the summary information as well as the bitmap.
149 */
150STATIC int /* error */
151xfs_rtallocate_range(
152 xfs_mount_t *mp, /* file system mount point */
153 xfs_trans_t *tp, /* transaction pointer */
154 xfs_rtblock_t start, /* start block to allocate */
155 xfs_extlen_t len, /* length to allocate */
156 xfs_buf_t **rbpp, /* in/out: summary block buffer */
157 xfs_fsblock_t *rsb) /* in/out: summary block number */
158{
159 xfs_rtblock_t end; /* end of the allocated extent */
160 int error; /* error value */
161 xfs_rtblock_t postblock = 0; /* first block allocated > end */
162 xfs_rtblock_t preblock = 0; /* first block allocated < start */
163
164 end = start + len - 1;
165 /*
166 * Assume we're allocating out of the middle of a free extent.
167 * We need to find the beginning and end of the extent so we can
168 * properly update the summary.
169 */
170 error = xfs_rtfind_back(mp, tp, start, 0, &preblock);
171 if (error) {
172 return error;
173 }
174 /*
175 * Find the next allocated block (end of free extent).
176 */
177 error = xfs_rtfind_forw(mp, tp, end, mp->m_sb.sb_rextents - 1,
178 &postblock);
179 if (error) {
180 return error;
181 }
182 /*
183 * Decrement the summary information corresponding to the entire
184 * (old) free extent.
185 */
186 error = xfs_rtmodify_summary(mp, tp,
187 XFS_RTBLOCKLOG(postblock + 1 - preblock),
188 XFS_BITTOBLOCK(mp, preblock), -1, rbpp, rsb);
189 if (error) {
190 return error;
191 }
192 /*
193 * If there are blocks not being allocated at the front of the
194 * old extent, add summary data for them to be free.
195 */
196 if (preblock < start) {
197 error = xfs_rtmodify_summary(mp, tp,
198 XFS_RTBLOCKLOG(start - preblock),
199 XFS_BITTOBLOCK(mp, preblock), 1, rbpp, rsb);
200 if (error) {
201 return error;
202 }
203 }
204 /*
205 * If there are blocks not being allocated at the end of the
206 * old extent, add summary data for them to be free.
207 */
208 if (postblock > end) {
209 error = xfs_rtmodify_summary(mp, tp,
210 XFS_RTBLOCKLOG(postblock - end),
211 XFS_BITTOBLOCK(mp, end + 1), 1, rbpp, rsb);
212 if (error) {
213 return error;
214 }
215 }
216 /*
217 * Modify the bitmap to mark this extent allocated.
218 */
219 error = xfs_rtmodify_range(mp, tp, start, len, 0);
220 return error;
221}
222
223/*
224 * Attempt to allocate an extent minlen<=len<=maxlen starting from
225 * bitmap block bbno. If we don't get maxlen then use prod to trim
226 * the length, if given. Returns error; returns starting block in *rtblock.
227 * The lengths are all in rtextents.
228 */
229STATIC int /* error */
230xfs_rtallocate_extent_block(
231 xfs_mount_t *mp, /* file system mount point */
232 xfs_trans_t *tp, /* transaction pointer */
233 xfs_rtblock_t bbno, /* bitmap block number */
234 xfs_extlen_t minlen, /* minimum length to allocate */
235 xfs_extlen_t maxlen, /* maximum length to allocate */
236 xfs_extlen_t *len, /* out: actual length allocated */
237 xfs_rtblock_t *nextp, /* out: next block to try */
238 xfs_buf_t **rbpp, /* in/out: summary block buffer */
239 xfs_fsblock_t *rsb, /* in/out: summary block number */
240 xfs_extlen_t prod, /* extent product factor */
241 xfs_rtblock_t *rtblock) /* out: start block allocated */
242{
243 xfs_rtblock_t besti; /* best rtblock found so far */
244 xfs_rtblock_t bestlen; /* best length found so far */
245 xfs_rtblock_t end; /* last rtblock in chunk */
246 int error; /* error value */
247 xfs_rtblock_t i; /* current rtblock trying */
248 xfs_rtblock_t next; /* next rtblock to try */
249 int stat; /* status from internal calls */
250
251 /*
252 * Loop over all the extents starting in this bitmap block,
253 * looking for one that's long enough.
254 */
255 for (i = XFS_BLOCKTOBIT(mp, bbno), besti = -1, bestlen = 0,
256 end = XFS_BLOCKTOBIT(mp, bbno + 1) - 1;
257 i <= end;
258 i++) {
259 /*
260 * See if there's a free extent of maxlen starting at i.
261 * If it's not so then next will contain the first non-free.
262 */
263 error = xfs_rtcheck_range(mp, tp, i, maxlen, 1, &next, &stat);
264 if (error) {
265 return error;
266 }
267 if (stat) {
268 /*
269 * i for maxlen is all free, allocate and return that.
270 */
271 error = xfs_rtallocate_range(mp, tp, i, maxlen, rbpp,
272 rsb);
273 if (error) {
274 return error;
275 }
276 *len = maxlen;
277 *rtblock = i;
278 return 0;
279 }
280 /*
281 * In the case where we have a variable-sized allocation
282 * request, figure out how big this free piece is,
283 * and if it's big enough for the minimum, and the best
284 * so far, remember it.
285 */
286 if (minlen < maxlen) {
287 xfs_rtblock_t thislen; /* this extent size */
288
289 thislen = next - i;
290 if (thislen >= minlen && thislen > bestlen) {
291 besti = i;
292 bestlen = thislen;
293 }
294 }
295 /*
296 * If not done yet, find the start of the next free space.
297 */
298 if (next < end) {
299 error = xfs_rtfind_forw(mp, tp, next, end, &i);
300 if (error) {
301 return error;
302 }
303 } else
304 break;
305 }
306 /*
307 * Searched the whole thing & didn't find a maxlen free extent.
308 */
309 if (minlen < maxlen && besti != -1) {
310 xfs_extlen_t p; /* amount to trim length by */
311
312 /*
313 * If size should be a multiple of prod, make that so.
314 */
315 if (prod > 1 && (p = do_mod(bestlen, prod)))
316 bestlen -= p;
317 /*
318 * Allocate besti for bestlen & return that.
319 */
320 error = xfs_rtallocate_range(mp, tp, besti, bestlen, rbpp, rsb);
321 if (error) {
322 return error;
323 }
324 *len = bestlen;
325 *rtblock = besti;
326 return 0;
327 }
328 /*
329 * Allocation failed. Set *nextp to the next block to try.
330 */
331 *nextp = next;
332 *rtblock = NULLRTBLOCK;
333 return 0;
334}
335
336/*
337 * Allocate an extent of length minlen<=len<=maxlen, starting at block
338 * bno. If we don't get maxlen then use prod to trim the length, if given.
339 * Returns error; returns starting block in *rtblock.
340 * The lengths are all in rtextents.
341 */
342STATIC int /* error */
343xfs_rtallocate_extent_exact(
344 xfs_mount_t *mp, /* file system mount point */
345 xfs_trans_t *tp, /* transaction pointer */
346 xfs_rtblock_t bno, /* starting block number to allocate */
347 xfs_extlen_t minlen, /* minimum length to allocate */
348 xfs_extlen_t maxlen, /* maximum length to allocate */
349 xfs_extlen_t *len, /* out: actual length allocated */
350 xfs_buf_t **rbpp, /* in/out: summary block buffer */
351 xfs_fsblock_t *rsb, /* in/out: summary block number */
352 xfs_extlen_t prod, /* extent product factor */
353 xfs_rtblock_t *rtblock) /* out: start block allocated */
354{
355 int error; /* error value */
356 xfs_extlen_t i; /* extent length trimmed due to prod */
357 int isfree; /* extent is free */
358 xfs_rtblock_t next; /* next block to try (dummy) */
359
360 ASSERT(minlen % prod == 0 && maxlen % prod == 0);
361 /*
362 * Check if the range in question (for maxlen) is free.
363 */
364 error = xfs_rtcheck_range(mp, tp, bno, maxlen, 1, &next, &isfree);
365 if (error) {
366 return error;
367 }
368 if (isfree) {
369 /*
370 * If it is, allocate it and return success.
371 */
372 error = xfs_rtallocate_range(mp, tp, bno, maxlen, rbpp, rsb);
373 if (error) {
374 return error;
375 }
376 *len = maxlen;
377 *rtblock = bno;
378 return 0;
379 }
380 /*
381 * If not, allocate what there is, if it's at least minlen.
382 */
383 maxlen = next - bno;
384 if (maxlen < minlen) {
385 /*
386 * Failed, return failure status.
387 */
388 *rtblock = NULLRTBLOCK;
389 return 0;
390 }
391 /*
392 * Trim off tail of extent, if prod is specified.
393 */
394 if (prod > 1 && (i = maxlen % prod)) {
395 maxlen -= i;
396 if (maxlen < minlen) {
397 /*
398 * Now we can't do it, return failure status.
399 */
400 *rtblock = NULLRTBLOCK;
401 return 0;
402 }
403 }
404 /*
405 * Allocate what we can and return it.
406 */
407 error = xfs_rtallocate_range(mp, tp, bno, maxlen, rbpp, rsb);
408 if (error) {
409 return error;
410 }
411 *len = maxlen;
412 *rtblock = bno;
413 return 0;
414}
415
416/*
417 * Allocate an extent of length minlen<=len<=maxlen, starting as near
418 * to bno as possible. If we don't get maxlen then use prod to trim
419 * the length, if given. The lengths are all in rtextents.
420 */
421STATIC int /* error */
422xfs_rtallocate_extent_near(
423 xfs_mount_t *mp, /* file system mount point */
424 xfs_trans_t *tp, /* transaction pointer */
425 xfs_rtblock_t bno, /* starting block number to allocate */
426 xfs_extlen_t minlen, /* minimum length to allocate */
427 xfs_extlen_t maxlen, /* maximum length to allocate */
428 xfs_extlen_t *len, /* out: actual length allocated */
429 xfs_buf_t **rbpp, /* in/out: summary block buffer */
430 xfs_fsblock_t *rsb, /* in/out: summary block number */
431 xfs_extlen_t prod, /* extent product factor */
432 xfs_rtblock_t *rtblock) /* out: start block allocated */
433{
434 int any; /* any useful extents from summary */
435 xfs_rtblock_t bbno; /* bitmap block number */
436 int error; /* error value */
437 int i; /* bitmap block offset (loop control) */
438 int j; /* secondary loop control */
439 int log2len; /* log2 of minlen */
440 xfs_rtblock_t n; /* next block to try */
441 xfs_rtblock_t r; /* result block */
442
443 ASSERT(minlen % prod == 0 && maxlen % prod == 0);
444 /*
445 * If the block number given is off the end, silently set it to
446 * the last block.
447 */
448 if (bno >= mp->m_sb.sb_rextents)
449 bno = mp->m_sb.sb_rextents - 1;
450 /*
451 * Try the exact allocation first.
452 */
453 error = xfs_rtallocate_extent_exact(mp, tp, bno, minlen, maxlen, len,
454 rbpp, rsb, prod, &r);
455 if (error) {
456 return error;
457 }
458 /*
459 * If the exact allocation worked, return that.
460 */
461 if (r != NULLRTBLOCK) {
462 *rtblock = r;
463 return 0;
464 }
465 bbno = XFS_BITTOBLOCK(mp, bno);
466 i = 0;
467 ASSERT(minlen != 0);
468 log2len = xfs_highbit32(minlen);
469 /*
470 * Loop over all bitmap blocks (bbno + i is current block).
471 */
472 for (;;) {
473 /*
474 * Get summary information of extents of all useful levels
475 * starting in this bitmap block.
476 */
477 error = xfs_rtany_summary(mp, tp, log2len, mp->m_rsumlevels - 1,
478 bbno + i, rbpp, rsb, &any);
479 if (error) {
480 return error;
481 }
482 /*
483 * If there are any useful extents starting here, try
484 * allocating one.
485 */
486 if (any) {
487 /*
488 * On the positive side of the starting location.
489 */
490 if (i >= 0) {
491 /*
492 * Try to allocate an extent starting in
493 * this block.
494 */
495 error = xfs_rtallocate_extent_block(mp, tp,
496 bbno + i, minlen, maxlen, len, &n, rbpp,
497 rsb, prod, &r);
498 if (error) {
499 return error;
500 }
501 /*
502 * If it worked, return it.
503 */
504 if (r != NULLRTBLOCK) {
505 *rtblock = r;
506 return 0;
507 }
508 }
509 /*
510 * On the negative side of the starting location.
511 */
512 else { /* i < 0 */
513 /*
514 * Loop backwards through the bitmap blocks from
515 * the starting point-1 up to where we are now.
516 * There should be an extent which ends in this
517 * bitmap block and is long enough.
518 */
519 for (j = -1; j > i; j--) {
520 /*
521 * Grab the summary information for
522 * this bitmap block.
523 */
524 error = xfs_rtany_summary(mp, tp,
525 log2len, mp->m_rsumlevels - 1,
526 bbno + j, rbpp, rsb, &any);
527 if (error) {
528 return error;
529 }
530 /*
531 * If there's no extent given in the
532 * summary that means the extent we
533 * found must carry over from an
534 * earlier block. If there is an
535 * extent given, we've already tried
536 * that allocation, don't do it again.
537 */
538 if (any)
539 continue;
540 error = xfs_rtallocate_extent_block(mp,
541 tp, bbno + j, minlen, maxlen,
542 len, &n, rbpp, rsb, prod, &r);
543 if (error) {
544 return error;
545 }
546 /*
547 * If it works, return the extent.
548 */
549 if (r != NULLRTBLOCK) {
550 *rtblock = r;
551 return 0;
552 }
553 }
554 /*
555 * There weren't intervening bitmap blocks
556 * with a long enough extent, or the
557 * allocation didn't work for some reason
558 * (i.e. it's a little * too short).
559 * Try to allocate from the summary block
560 * that we found.
561 */
562 error = xfs_rtallocate_extent_block(mp, tp,
563 bbno + i, minlen, maxlen, len, &n, rbpp,
564 rsb, prod, &r);
565 if (error) {
566 return error;
567 }
568 /*
569 * If it works, return the extent.
570 */
571 if (r != NULLRTBLOCK) {
572 *rtblock = r;
573 return 0;
574 }
575 }
576 }
577 /*
578 * Loop control. If we were on the positive side, and there's
579 * still more blocks on the negative side, go there.
580 */
581 if (i > 0 && (int)bbno - i >= 0)
582 i = -i;
583 /*
584 * If positive, and no more negative, but there are more
585 * positive, go there.
586 */
587 else if (i > 0 && (int)bbno + i < mp->m_sb.sb_rbmblocks - 1)
588 i++;
589 /*
590 * If negative or 0 (just started), and there are positive
591 * blocks to go, go there. The 0 case moves to block 1.
592 */
593 else if (i <= 0 && (int)bbno - i < mp->m_sb.sb_rbmblocks - 1)
594 i = 1 - i;
595 /*
596 * If negative or 0 and there are more negative blocks,
597 * go there.
598 */
599 else if (i <= 0 && (int)bbno + i > 0)
600 i--;
601 /*
602 * Must be done. Return failure.
603 */
604 else
605 break;
606 }
607 *rtblock = NULLRTBLOCK;
608 return 0;
609}
610
611/*
612 * Allocate an extent of length minlen<=len<=maxlen, with no position
613 * specified. If we don't get maxlen then use prod to trim
614 * the length, if given. The lengths are all in rtextents.
615 */
616STATIC int /* error */
617xfs_rtallocate_extent_size(
618 xfs_mount_t *mp, /* file system mount point */
619 xfs_trans_t *tp, /* transaction pointer */
620 xfs_extlen_t minlen, /* minimum length to allocate */
621 xfs_extlen_t maxlen, /* maximum length to allocate */
622 xfs_extlen_t *len, /* out: actual length allocated */
623 xfs_buf_t **rbpp, /* in/out: summary block buffer */
624 xfs_fsblock_t *rsb, /* in/out: summary block number */
625 xfs_extlen_t prod, /* extent product factor */
626 xfs_rtblock_t *rtblock) /* out: start block allocated */
627{
628 int error; /* error value */
629 int i; /* bitmap block number */
630 int l; /* level number (loop control) */
631 xfs_rtblock_t n; /* next block to be tried */
632 xfs_rtblock_t r; /* result block number */
633 xfs_suminfo_t sum; /* summary information for extents */
634
635 ASSERT(minlen % prod == 0 && maxlen % prod == 0);
636 ASSERT(maxlen != 0);
637
638 /*
639 * Loop over all the levels starting with maxlen.
640 * At each level, look at all the bitmap blocks, to see if there
641 * are extents starting there that are long enough (>= maxlen).
642 * Note, only on the initial level can the allocation fail if
643 * the summary says there's an extent.
644 */
645 for (l = xfs_highbit32(maxlen); l < mp->m_rsumlevels; l++) {
646 /*
647 * Loop over all the bitmap blocks.
648 */
649 for (i = 0; i < mp->m_sb.sb_rbmblocks; i++) {
650 /*
651 * Get the summary for this level/block.
652 */
653 error = xfs_rtget_summary(mp, tp, l, i, rbpp, rsb,
654 &sum);
655 if (error) {
656 return error;
657 }
658 /*
659 * Nothing there, on to the next block.
660 */
661 if (!sum)
662 continue;
663 /*
664 * Try allocating the extent.
665 */
666 error = xfs_rtallocate_extent_block(mp, tp, i, maxlen,
667 maxlen, len, &n, rbpp, rsb, prod, &r);
668 if (error) {
669 return error;
670 }
671 /*
672 * If it worked, return that.
673 */
674 if (r != NULLRTBLOCK) {
675 *rtblock = r;
676 return 0;
677 }
678 /*
679 * If the "next block to try" returned from the
680 * allocator is beyond the next bitmap block,
681 * skip to that bitmap block.
682 */
683 if (XFS_BITTOBLOCK(mp, n) > i + 1)
684 i = XFS_BITTOBLOCK(mp, n) - 1;
685 }
686 }
687 /*
688 * Didn't find any maxlen blocks. Try smaller ones, unless
689 * we're asking for a fixed size extent.
690 */
691 if (minlen > --maxlen) {
692 *rtblock = NULLRTBLOCK;
693 return 0;
694 }
695 ASSERT(minlen != 0);
696 ASSERT(maxlen != 0);
697
698 /*
699 * Loop over sizes, from maxlen down to minlen.
700 * This time, when we do the allocations, allow smaller ones
701 * to succeed.
702 */
703 for (l = xfs_highbit32(maxlen); l >= xfs_highbit32(minlen); l--) {
704 /*
705 * Loop over all the bitmap blocks, try an allocation
706 * starting in that block.
707 */
708 for (i = 0; i < mp->m_sb.sb_rbmblocks; i++) {
709 /*
710 * Get the summary information for this level/block.
711 */
712 error = xfs_rtget_summary(mp, tp, l, i, rbpp, rsb,
713 &sum);
714 if (error) {
715 return error;
716 }
717 /*
718 * If nothing there, go on to next.
719 */
720 if (!sum)
721 continue;
722 /*
723 * Try the allocation. Make sure the specified
724 * minlen/maxlen are in the possible range for
725 * this summary level.
726 */
727 error = xfs_rtallocate_extent_block(mp, tp, i,
728 XFS_RTMAX(minlen, 1 << l),
729 XFS_RTMIN(maxlen, (1 << (l + 1)) - 1),
730 len, &n, rbpp, rsb, prod, &r);
731 if (error) {
732 return error;
733 }
734 /*
735 * If it worked, return that extent.
736 */
737 if (r != NULLRTBLOCK) {
738 *rtblock = r;
739 return 0;
740 }
741 /*
742 * If the "next block to try" returned from the
743 * allocator is beyond the next bitmap block,
744 * skip to that bitmap block.
745 */
746 if (XFS_BITTOBLOCK(mp, n) > i + 1)
747 i = XFS_BITTOBLOCK(mp, n) - 1;
748 }
749 }
750 /*
751 * Got nothing, return failure.
752 */
753 *rtblock = NULLRTBLOCK;
754 return 0;
755}
756
757/*
758 * Allocate space to the bitmap or summary file, and zero it, for growfs.
759 */
760STATIC int
761xfs_growfs_rt_alloc(
762 struct xfs_mount *mp, /* file system mount point */
763 xfs_extlen_t oblocks, /* old count of blocks */
764 xfs_extlen_t nblocks, /* new count of blocks */
765 struct xfs_inode *ip) /* inode (bitmap/summary) */
766{
767 xfs_fileoff_t bno; /* block number in file */
768 struct xfs_buf *bp; /* temporary buffer for zeroing */
769 xfs_daddr_t d; /* disk block address */
770 int error; /* error return value */
771 xfs_fsblock_t firstblock;/* first block allocated in xaction */
772 struct xfs_bmap_free flist; /* list of freed blocks */
773 xfs_fsblock_t fsbno; /* filesystem block for bno */
774 struct xfs_bmbt_irec map; /* block map output */
775 int nmap; /* number of block maps */
776 int resblks; /* space reservation */
777 struct xfs_trans *tp;
778
779 /*
780 * Allocate space to the file, as necessary.
781 */
782 while (oblocks < nblocks) {
783 tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFSRT_ALLOC);
784 resblks = XFS_GROWFSRT_SPACE_RES(mp, nblocks - oblocks);
785 /*
786 * Reserve space & log for one extent added to the file.
787 */
788 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_growrtalloc,
789 resblks, 0);
790 if (error)
791 goto out_trans_cancel;
792 /*
793 * Lock the inode.
794 */
795 xfs_ilock(ip, XFS_ILOCK_EXCL);
796 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
797
798 xfs_bmap_init(&flist, &firstblock);
799 /*
800 * Allocate blocks to the bitmap file.
801 */
802 nmap = 1;
803 error = xfs_bmapi_write(tp, ip, oblocks, nblocks - oblocks,
804 XFS_BMAPI_METADATA, &firstblock,
805 resblks, &map, &nmap, &flist);
806 if (!error && nmap < 1)
807 error = -ENOSPC;
808 if (error)
809 goto out_bmap_cancel;
810 /*
811 * Free any blocks freed up in the transaction, then commit.
812 */
813 error = xfs_bmap_finish(&tp, &flist, NULL);
814 if (error)
815 goto out_bmap_cancel;
816 error = xfs_trans_commit(tp);
817 if (error)
818 return error;
819 /*
820 * Now we need to clear the allocated blocks.
821 * Do this one block per transaction, to keep it simple.
822 */
823 for (bno = map.br_startoff, fsbno = map.br_startblock;
824 bno < map.br_startoff + map.br_blockcount;
825 bno++, fsbno++) {
826 tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFSRT_ZERO);
827 /*
828 * Reserve log for one block zeroing.
829 */
830 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_growrtzero,
831 0, 0);
832 if (error)
833 goto out_trans_cancel;
834 /*
835 * Lock the bitmap inode.
836 */
837 xfs_ilock(ip, XFS_ILOCK_EXCL);
838 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
839 /*
840 * Get a buffer for the block.
841 */
842 d = XFS_FSB_TO_DADDR(mp, fsbno);
843 bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, d,
844 mp->m_bsize, 0);
845 if (bp == NULL) {
846 error = -EIO;
847 goto out_trans_cancel;
848 }
849 memset(bp->b_addr, 0, mp->m_sb.sb_blocksize);
850 xfs_trans_log_buf(tp, bp, 0, mp->m_sb.sb_blocksize - 1);
851 /*
852 * Commit the transaction.
853 */
854 error = xfs_trans_commit(tp);
855 if (error)
856 return error;
857 }
858 /*
859 * Go on to the next extent, if any.
860 */
861 oblocks = map.br_startoff + map.br_blockcount;
862 }
863
864 return 0;
865
866out_bmap_cancel:
867 xfs_bmap_cancel(&flist);
868out_trans_cancel:
869 xfs_trans_cancel(tp);
870 return error;
871}
872
873/*
874 * Visible (exported) functions.
875 */
876
877/*
878 * Grow the realtime area of the filesystem.
879 */
880int
881xfs_growfs_rt(
882 xfs_mount_t *mp, /* mount point for filesystem */
883 xfs_growfs_rt_t *in) /* growfs rt input struct */
884{
885 xfs_rtblock_t bmbno; /* bitmap block number */
886 xfs_buf_t *bp; /* temporary buffer */
887 int error; /* error return value */
888 xfs_mount_t *nmp; /* new (fake) mount structure */
889 xfs_rfsblock_t nrblocks; /* new number of realtime blocks */
890 xfs_extlen_t nrbmblocks; /* new number of rt bitmap blocks */
891 xfs_rtblock_t nrextents; /* new number of realtime extents */
892 uint8_t nrextslog; /* new log2 of sb_rextents */
893 xfs_extlen_t nrsumblocks; /* new number of summary blocks */
894 uint nrsumlevels; /* new rt summary levels */
895 uint nrsumsize; /* new size of rt summary, bytes */
896 xfs_sb_t *nsbp; /* new superblock */
897 xfs_extlen_t rbmblocks; /* current number of rt bitmap blocks */
898 xfs_extlen_t rsumblocks; /* current number of rt summary blks */
899 xfs_sb_t *sbp; /* old superblock */
900 xfs_fsblock_t sumbno; /* summary block number */
901
902 sbp = &mp->m_sb;
903 /*
904 * Initial error checking.
905 */
906 if (!capable(CAP_SYS_ADMIN))
907 return -EPERM;
908 if (mp->m_rtdev_targp == NULL || mp->m_rbmip == NULL ||
909 (nrblocks = in->newblocks) <= sbp->sb_rblocks ||
910 (sbp->sb_rblocks && (in->extsize != sbp->sb_rextsize)))
911 return -EINVAL;
912 if ((error = xfs_sb_validate_fsb_count(sbp, nrblocks)))
913 return error;
914 /*
915 * Read in the last block of the device, make sure it exists.
916 */
917 error = xfs_buf_read_uncached(mp->m_rtdev_targp,
918 XFS_FSB_TO_BB(mp, nrblocks - 1),
919 XFS_FSB_TO_BB(mp, 1), 0, &bp, NULL);
920 if (error)
921 return error;
922 xfs_buf_relse(bp);
923
924 /*
925 * Calculate new parameters. These are the final values to be reached.
926 */
927 nrextents = nrblocks;
928 do_div(nrextents, in->extsize);
929 nrbmblocks = howmany_64(nrextents, NBBY * sbp->sb_blocksize);
930 nrextslog = xfs_highbit32(nrextents);
931 nrsumlevels = nrextslog + 1;
932 nrsumsize = (uint)sizeof(xfs_suminfo_t) * nrsumlevels * nrbmblocks;
933 nrsumblocks = XFS_B_TO_FSB(mp, nrsumsize);
934 nrsumsize = XFS_FSB_TO_B(mp, nrsumblocks);
935 /*
936 * New summary size can't be more than half the size of
937 * the log. This prevents us from getting a log overflow,
938 * since we'll log basically the whole summary file at once.
939 */
940 if (nrsumblocks > (mp->m_sb.sb_logblocks >> 1))
941 return -EINVAL;
942 /*
943 * Get the old block counts for bitmap and summary inodes.
944 * These can't change since other growfs callers are locked out.
945 */
946 rbmblocks = XFS_B_TO_FSB(mp, mp->m_rbmip->i_d.di_size);
947 rsumblocks = XFS_B_TO_FSB(mp, mp->m_rsumip->i_d.di_size);
948 /*
949 * Allocate space to the bitmap and summary files, as necessary.
950 */
951 error = xfs_growfs_rt_alloc(mp, rbmblocks, nrbmblocks, mp->m_rbmip);
952 if (error)
953 return error;
954 error = xfs_growfs_rt_alloc(mp, rsumblocks, nrsumblocks, mp->m_rsumip);
955 if (error)
956 return error;
957 /*
958 * Allocate a new (fake) mount/sb.
959 */
960 nmp = kmem_alloc(sizeof(*nmp), KM_SLEEP);
961 /*
962 * Loop over the bitmap blocks.
963 * We will do everything one bitmap block at a time.
964 * Skip the current block if it is exactly full.
965 * This also deals with the case where there were no rtextents before.
966 */
967 for (bmbno = sbp->sb_rbmblocks -
968 ((sbp->sb_rextents & ((1 << mp->m_blkbit_log) - 1)) != 0);
969 bmbno < nrbmblocks;
970 bmbno++) {
971 xfs_trans_t *tp;
972
973 *nmp = *mp;
974 nsbp = &nmp->m_sb;
975 /*
976 * Calculate new sb and mount fields for this round.
977 */
978 nsbp->sb_rextsize = in->extsize;
979 nsbp->sb_rbmblocks = bmbno + 1;
980 nsbp->sb_rblocks =
981 XFS_RTMIN(nrblocks,
982 nsbp->sb_rbmblocks * NBBY *
983 nsbp->sb_blocksize * nsbp->sb_rextsize);
984 nsbp->sb_rextents = nsbp->sb_rblocks;
985 do_div(nsbp->sb_rextents, nsbp->sb_rextsize);
986 ASSERT(nsbp->sb_rextents != 0);
987 nsbp->sb_rextslog = xfs_highbit32(nsbp->sb_rextents);
988 nrsumlevels = nmp->m_rsumlevels = nsbp->sb_rextslog + 1;
989 nrsumsize =
990 (uint)sizeof(xfs_suminfo_t) * nrsumlevels *
991 nsbp->sb_rbmblocks;
992 nrsumblocks = XFS_B_TO_FSB(mp, nrsumsize);
993 nmp->m_rsumsize = nrsumsize = XFS_FSB_TO_B(mp, nrsumblocks);
994 /*
995 * Start a transaction, get the log reservation.
996 */
997 tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFSRT_FREE);
998 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_growrtfree,
999 0, 0);
1000 if (error)
1001 goto error_cancel;
1002 /*
1003 * Lock out other callers by grabbing the bitmap inode lock.
1004 */
1005 xfs_ilock(mp->m_rbmip, XFS_ILOCK_EXCL);
1006 xfs_trans_ijoin(tp, mp->m_rbmip, XFS_ILOCK_EXCL);
1007 /*
1008 * Update the bitmap inode's size.
1009 */
1010 mp->m_rbmip->i_d.di_size =
1011 nsbp->sb_rbmblocks * nsbp->sb_blocksize;
1012 xfs_trans_log_inode(tp, mp->m_rbmip, XFS_ILOG_CORE);
1013 /*
1014 * Get the summary inode into the transaction.
1015 */
1016 xfs_ilock(mp->m_rsumip, XFS_ILOCK_EXCL);
1017 xfs_trans_ijoin(tp, mp->m_rsumip, XFS_ILOCK_EXCL);
1018 /*
1019 * Update the summary inode's size.
1020 */
1021 mp->m_rsumip->i_d.di_size = nmp->m_rsumsize;
1022 xfs_trans_log_inode(tp, mp->m_rsumip, XFS_ILOG_CORE);
1023 /*
1024 * Copy summary data from old to new sizes.
1025 * Do this when the real size (not block-aligned) changes.
1026 */
1027 if (sbp->sb_rbmblocks != nsbp->sb_rbmblocks ||
1028 mp->m_rsumlevels != nmp->m_rsumlevels) {
1029 error = xfs_rtcopy_summary(mp, nmp, tp);
1030 if (error)
1031 goto error_cancel;
1032 }
1033 /*
1034 * Update superblock fields.
1035 */
1036 if (nsbp->sb_rextsize != sbp->sb_rextsize)
1037 xfs_trans_mod_sb(tp, XFS_TRANS_SB_REXTSIZE,
1038 nsbp->sb_rextsize - sbp->sb_rextsize);
1039 if (nsbp->sb_rbmblocks != sbp->sb_rbmblocks)
1040 xfs_trans_mod_sb(tp, XFS_TRANS_SB_RBMBLOCKS,
1041 nsbp->sb_rbmblocks - sbp->sb_rbmblocks);
1042 if (nsbp->sb_rblocks != sbp->sb_rblocks)
1043 xfs_trans_mod_sb(tp, XFS_TRANS_SB_RBLOCKS,
1044 nsbp->sb_rblocks - sbp->sb_rblocks);
1045 if (nsbp->sb_rextents != sbp->sb_rextents)
1046 xfs_trans_mod_sb(tp, XFS_TRANS_SB_REXTENTS,
1047 nsbp->sb_rextents - sbp->sb_rextents);
1048 if (nsbp->sb_rextslog != sbp->sb_rextslog)
1049 xfs_trans_mod_sb(tp, XFS_TRANS_SB_REXTSLOG,
1050 nsbp->sb_rextslog - sbp->sb_rextslog);
1051 /*
1052 * Free new extent.
1053 */
1054 bp = NULL;
1055 error = xfs_rtfree_range(nmp, tp, sbp->sb_rextents,
1056 nsbp->sb_rextents - sbp->sb_rextents, &bp, &sumbno);
1057 if (error) {
1058error_cancel:
1059 xfs_trans_cancel(tp);
1060 break;
1061 }
1062 /*
1063 * Mark more blocks free in the superblock.
1064 */
1065 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FREXTENTS,
1066 nsbp->sb_rextents - sbp->sb_rextents);
1067 /*
1068 * Update mp values into the real mp structure.
1069 */
1070 mp->m_rsumlevels = nrsumlevels;
1071 mp->m_rsumsize = nrsumsize;
1072
1073 error = xfs_trans_commit(tp);
1074 if (error)
1075 break;
1076 }
1077
1078 /*
1079 * Free the fake mp structure.
1080 */
1081 kmem_free(nmp);
1082
1083 return error;
1084}
1085
1086/*
1087 * Allocate an extent in the realtime subvolume, with the usual allocation
1088 * parameters. The length units are all in realtime extents, as is the
1089 * result block number.
1090 */
1091int /* error */
1092xfs_rtallocate_extent(
1093 xfs_trans_t *tp, /* transaction pointer */
1094 xfs_rtblock_t bno, /* starting block number to allocate */
1095 xfs_extlen_t minlen, /* minimum length to allocate */
1096 xfs_extlen_t maxlen, /* maximum length to allocate */
1097 xfs_extlen_t *len, /* out: actual length allocated */
1098 xfs_alloctype_t type, /* allocation type XFS_ALLOCTYPE... */
1099 int wasdel, /* was a delayed allocation extent */
1100 xfs_extlen_t prod, /* extent product factor */
1101 xfs_rtblock_t *rtblock) /* out: start block allocated */
1102{
1103 xfs_mount_t *mp = tp->t_mountp;
1104 int error; /* error value */
1105 xfs_rtblock_t r; /* result allocated block */
1106 xfs_fsblock_t sb; /* summary file block number */
1107 xfs_buf_t *sumbp; /* summary file block buffer */
1108
1109 ASSERT(xfs_isilocked(mp->m_rbmip, XFS_ILOCK_EXCL));
1110 ASSERT(minlen > 0 && minlen <= maxlen);
1111
1112 /*
1113 * If prod is set then figure out what to do to minlen and maxlen.
1114 */
1115 if (prod > 1) {
1116 xfs_extlen_t i;
1117
1118 if ((i = maxlen % prod))
1119 maxlen -= i;
1120 if ((i = minlen % prod))
1121 minlen += prod - i;
1122 if (maxlen < minlen) {
1123 *rtblock = NULLRTBLOCK;
1124 return 0;
1125 }
1126 }
1127
1128 sumbp = NULL;
1129 /*
1130 * Allocate by size, or near another block, or exactly at some block.
1131 */
1132 switch (type) {
1133 case XFS_ALLOCTYPE_ANY_AG:
1134 error = xfs_rtallocate_extent_size(mp, tp, minlen, maxlen, len,
1135 &sumbp, &sb, prod, &r);
1136 break;
1137 case XFS_ALLOCTYPE_NEAR_BNO:
1138 error = xfs_rtallocate_extent_near(mp, tp, bno, minlen, maxlen,
1139 len, &sumbp, &sb, prod, &r);
1140 break;
1141 case XFS_ALLOCTYPE_THIS_BNO:
1142 error = xfs_rtallocate_extent_exact(mp, tp, bno, minlen, maxlen,
1143 len, &sumbp, &sb, prod, &r);
1144 break;
1145 default:
1146 error = -EIO;
1147 ASSERT(0);
1148 }
1149 if (error)
1150 return error;
1151
1152 /*
1153 * If it worked, update the superblock.
1154 */
1155 if (r != NULLRTBLOCK) {
1156 long slen = (long)*len;
1157
1158 ASSERT(*len >= minlen && *len <= maxlen);
1159 if (wasdel)
1160 xfs_trans_mod_sb(tp, XFS_TRANS_SB_RES_FREXTENTS, -slen);
1161 else
1162 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FREXTENTS, -slen);
1163 }
1164 *rtblock = r;
1165 return 0;
1166}
1167
1168/*
1169 * Initialize realtime fields in the mount structure.
1170 */
1171int /* error */
1172xfs_rtmount_init(
1173 struct xfs_mount *mp) /* file system mount structure */
1174{
1175 struct xfs_buf *bp; /* buffer for last block of subvolume */
1176 struct xfs_sb *sbp; /* filesystem superblock copy in mount */
1177 xfs_daddr_t d; /* address of last block of subvolume */
1178 int error;
1179
1180 sbp = &mp->m_sb;
1181 if (sbp->sb_rblocks == 0)
1182 return 0;
1183 if (mp->m_rtdev_targp == NULL) {
1184 xfs_warn(mp,
1185 "Filesystem has a realtime volume, use rtdev=device option");
1186 return -ENODEV;
1187 }
1188 mp->m_rsumlevels = sbp->sb_rextslog + 1;
1189 mp->m_rsumsize =
1190 (uint)sizeof(xfs_suminfo_t) * mp->m_rsumlevels *
1191 sbp->sb_rbmblocks;
1192 mp->m_rsumsize = roundup(mp->m_rsumsize, sbp->sb_blocksize);
1193 mp->m_rbmip = mp->m_rsumip = NULL;
1194 /*
1195 * Check that the realtime section is an ok size.
1196 */
1197 d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_rblocks);
1198 if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_rblocks) {
1199 xfs_warn(mp, "realtime mount -- %llu != %llu",
1200 (unsigned long long) XFS_BB_TO_FSB(mp, d),
1201 (unsigned long long) mp->m_sb.sb_rblocks);
1202 return -EFBIG;
1203 }
1204 error = xfs_buf_read_uncached(mp->m_rtdev_targp,
1205 d - XFS_FSB_TO_BB(mp, 1),
1206 XFS_FSB_TO_BB(mp, 1), 0, &bp, NULL);
1207 if (error) {
1208 xfs_warn(mp, "realtime device size check failed");
1209 return error;
1210 }
1211 xfs_buf_relse(bp);
1212 return 0;
1213}
1214
1215/*
1216 * Get the bitmap and summary inodes into the mount structure
1217 * at mount time.
1218 */
1219int /* error */
1220xfs_rtmount_inodes(
1221 xfs_mount_t *mp) /* file system mount structure */
1222{
1223 int error; /* error return value */
1224 xfs_sb_t *sbp;
1225
1226 sbp = &mp->m_sb;
1227 if (sbp->sb_rbmino == NULLFSINO)
1228 return 0;
1229 error = xfs_iget(mp, NULL, sbp->sb_rbmino, 0, 0, &mp->m_rbmip);
1230 if (error)
1231 return error;
1232 ASSERT(mp->m_rbmip != NULL);
1233 ASSERT(sbp->sb_rsumino != NULLFSINO);
1234 error = xfs_iget(mp, NULL, sbp->sb_rsumino, 0, 0, &mp->m_rsumip);
1235 if (error) {
1236 IRELE(mp->m_rbmip);
1237 return error;
1238 }
1239 ASSERT(mp->m_rsumip != NULL);
1240 return 0;
1241}
1242
1243void
1244xfs_rtunmount_inodes(
1245 struct xfs_mount *mp)
1246{
1247 if (mp->m_rbmip)
1248 IRELE(mp->m_rbmip);
1249 if (mp->m_rsumip)
1250 IRELE(mp->m_rsumip);
1251}
1252
1253/*
1254 * Pick an extent for allocation at the start of a new realtime file.
1255 * Use the sequence number stored in the atime field of the bitmap inode.
1256 * Translate this to a fraction of the rtextents, and return the product
1257 * of rtextents and the fraction.
1258 * The fraction sequence is 0, 1/2, 1/4, 3/4, 1/8, ..., 7/8, 1/16, ...
1259 */
1260int /* error */
1261xfs_rtpick_extent(
1262 xfs_mount_t *mp, /* file system mount point */
1263 xfs_trans_t *tp, /* transaction pointer */
1264 xfs_extlen_t len, /* allocation length (rtextents) */
1265 xfs_rtblock_t *pick) /* result rt extent */
1266{
1267 xfs_rtblock_t b; /* result block */
1268 int log2; /* log of sequence number */
1269 __uint64_t resid; /* residual after log removed */
1270 __uint64_t seq; /* sequence number of file creation */
1271 __uint64_t *seqp; /* pointer to seqno in inode */
1272
1273 ASSERT(xfs_isilocked(mp->m_rbmip, XFS_ILOCK_EXCL));
1274
1275 seqp = (__uint64_t *)&VFS_I(mp->m_rbmip)->i_atime;
1276 if (!(mp->m_rbmip->i_d.di_flags & XFS_DIFLAG_NEWRTBM)) {
1277 mp->m_rbmip->i_d.di_flags |= XFS_DIFLAG_NEWRTBM;
1278 *seqp = 0;
1279 }
1280 seq = *seqp;
1281 if ((log2 = xfs_highbit64(seq)) == -1)
1282 b = 0;
1283 else {
1284 resid = seq - (1ULL << log2);
1285 b = (mp->m_sb.sb_rextents * ((resid << 1) + 1ULL)) >>
1286 (log2 + 1);
1287 if (b >= mp->m_sb.sb_rextents)
1288 b = do_mod(b, mp->m_sb.sb_rextents);
1289 if (b + len > mp->m_sb.sb_rextents)
1290 b = mp->m_sb.sb_rextents - len;
1291 }
1292 *seqp = seq + 1;
1293 xfs_trans_log_inode(tp, mp->m_rbmip, XFS_ILOG_CORE);
1294 *pick = b;
1295 return 0;
1296}