1 // SPDX-License-Identifier: GPL-2.0
3 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
8 #include "xfs_shared.h"
9 #include "xfs_format.h"
10 #include "xfs_log_format.h"
11 #include "xfs_trans_resv.h"
13 #include "xfs_mount.h"
14 #include "xfs_inode.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"
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.
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 */
39 return xfs_rtmodify_summary_int(mp, tp, log, bbno, 0, rbpp, rsb, sum);
43 * Return whether there are any free extents in the size range given
44 * by low and high, for the bitmap block bbno.
46 STATIC int /* error */
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? */
57 int error; /* error value */
58 int log; /* loop counter, log2 of ext. size */
59 xfs_suminfo_t sum; /* summary data */
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];
66 * Loop over logs of extent sizes.
68 for (log = low; log <= high; log++) {
70 * Get one summary datum.
72 error = xfs_rtget_summary(mp, tp, log, bbno, rbpp, rsb, &sum);
77 * If there are any, return success.
85 * Found nothing, return failure.
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;
97 * Copy and transform the summary file, given the old and new
98 * parameters in the mount structures.
100 STATIC int /* error */
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 */
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 */
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;
118 error = xfs_rtget_summary(omp, tp, log, bbno, &bp,
124 error = xfs_rtmodify_summary(omp, tp, log, bbno, -sum,
128 error = xfs_rtmodify_summary(nmp, tp, log, bbno, sum,
138 * Mark an extent specified by start and len allocated.
139 * Updates all the summary information as well as the bitmap.
141 STATIC int /* error */
142 xfs_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 */
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 */
155 end = start + len - 1;
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.
161 error = xfs_rtfind_back(mp, tp, start, 0, &preblock);
166 * Find the next allocated block (end of free extent).
168 error = xfs_rtfind_forw(mp, tp, end, mp->m_sb.sb_rextents - 1,
174 * Decrement the summary information corresponding to the entire
177 error = xfs_rtmodify_summary(mp, tp,
178 XFS_RTBLOCKLOG(postblock + 1 - preblock),
179 XFS_BITTOBLOCK(mp, preblock), -1, rbpp, rsb);
184 * If there are blocks not being allocated at the front of the
185 * old extent, add summary data for them to be free.
187 if (preblock < start) {
188 error = xfs_rtmodify_summary(mp, tp,
189 XFS_RTBLOCKLOG(start - preblock),
190 XFS_BITTOBLOCK(mp, preblock), 1, rbpp, rsb);
196 * If there are blocks not being allocated at the end of the
197 * old extent, add summary data for them to be free.
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);
208 * Modify the bitmap to mark this extent allocated.
210 error = xfs_rtmodify_range(mp, tp, start, len, 0);
215 * Make sure we don't run off the end of the rt volume. Be careful that
216 * adjusting maxlen downwards doesn't cause us to fail the alignment checks.
218 static inline xfs_extlen_t
219 xfs_rtallocate_clamp_len(
220 struct xfs_mount *mp,
221 xfs_rtblock_t startrtx,
227 ret = min(mp->m_sb.sb_rextents, startrtx + rtxlen) - startrtx;
228 return rounddown(ret, prod);
232 * Attempt to allocate an extent minlen<=len<=maxlen starting from
233 * bitmap block bbno. If we don't get maxlen then use prod to trim
234 * the length, if given. Returns error; returns starting block in *rtblock.
235 * The lengths are all in rtextents.
237 STATIC int /* error */
238 xfs_rtallocate_extent_block(
239 xfs_mount_t *mp, /* file system mount point */
240 xfs_trans_t *tp, /* transaction pointer */
241 xfs_rtblock_t bbno, /* bitmap block number */
242 xfs_extlen_t minlen, /* minimum length to allocate */
243 xfs_extlen_t maxlen, /* maximum length to allocate */
244 xfs_extlen_t *len, /* out: actual length allocated */
245 xfs_rtblock_t *nextp, /* out: next block to try */
246 struct xfs_buf **rbpp, /* in/out: summary block buffer */
247 xfs_fsblock_t *rsb, /* in/out: summary block number */
248 xfs_extlen_t prod, /* extent product factor */
249 xfs_rtblock_t *rtblock) /* out: start block allocated */
251 xfs_rtblock_t besti; /* best rtblock found so far */
252 xfs_rtblock_t bestlen; /* best length found so far */
253 xfs_rtblock_t end; /* last rtblock in chunk */
254 int error; /* error value */
255 xfs_rtblock_t i; /* current rtblock trying */
256 xfs_rtblock_t next; /* next rtblock to try */
257 int stat; /* status from internal calls */
260 * Loop over all the extents starting in this bitmap block,
261 * looking for one that's long enough.
263 for (i = XFS_BLOCKTOBIT(mp, bbno), besti = -1, bestlen = 0,
264 end = XFS_BLOCKTOBIT(mp, bbno + 1) - 1;
267 /* Make sure we don't scan off the end of the rt volume. */
268 maxlen = xfs_rtallocate_clamp_len(mp, i, maxlen, prod);
271 * See if there's a free extent of maxlen starting at i.
272 * If it's not so then next will contain the first non-free.
274 error = xfs_rtcheck_range(mp, tp, i, maxlen, 1, &next, &stat);
280 * i for maxlen is all free, allocate and return that.
282 error = xfs_rtallocate_range(mp, tp, i, maxlen, rbpp,
292 * In the case where we have a variable-sized allocation
293 * request, figure out how big this free piece is,
294 * and if it's big enough for the minimum, and the best
295 * so far, remember it.
297 if (minlen < maxlen) {
298 xfs_rtblock_t thislen; /* this extent size */
301 if (thislen >= minlen && thislen > bestlen) {
307 * If not done yet, find the start of the next free space.
310 error = xfs_rtfind_forw(mp, tp, next, end, &i);
318 * Searched the whole thing & didn't find a maxlen free extent.
320 if (minlen < maxlen && besti != -1) {
321 xfs_extlen_t p; /* amount to trim length by */
324 * If size should be a multiple of prod, make that so.
327 div_u64_rem(bestlen, prod, &p);
333 * Allocate besti for bestlen & return that.
335 error = xfs_rtallocate_range(mp, tp, besti, bestlen, rbpp, rsb);
344 * Allocation failed. Set *nextp to the next block to try.
347 *rtblock = NULLRTBLOCK;
352 * Allocate an extent of length minlen<=len<=maxlen, starting at block
353 * bno. If we don't get maxlen then use prod to trim the length, if given.
354 * Returns error; returns starting block in *rtblock.
355 * The lengths are all in rtextents.
357 STATIC int /* error */
358 xfs_rtallocate_extent_exact(
359 xfs_mount_t *mp, /* file system mount point */
360 xfs_trans_t *tp, /* transaction pointer */
361 xfs_rtblock_t bno, /* starting block number to allocate */
362 xfs_extlen_t minlen, /* minimum length to allocate */
363 xfs_extlen_t maxlen, /* maximum length to allocate */
364 xfs_extlen_t *len, /* out: actual length allocated */
365 struct xfs_buf **rbpp, /* in/out: summary block buffer */
366 xfs_fsblock_t *rsb, /* in/out: summary block number */
367 xfs_extlen_t prod, /* extent product factor */
368 xfs_rtblock_t *rtblock) /* out: start block allocated */
370 int error; /* error value */
371 xfs_extlen_t i; /* extent length trimmed due to prod */
372 int isfree; /* extent is free */
373 xfs_rtblock_t next; /* next block to try (dummy) */
375 ASSERT(minlen % prod == 0);
376 ASSERT(maxlen % prod == 0);
378 * Check if the range in question (for maxlen) is free.
380 error = xfs_rtcheck_range(mp, tp, bno, maxlen, 1, &next, &isfree);
386 * If it is, allocate it and return success.
388 error = xfs_rtallocate_range(mp, tp, bno, maxlen, rbpp, rsb);
397 * If not, allocate what there is, if it's at least minlen.
400 if (maxlen < minlen) {
402 * Failed, return failure status.
404 *rtblock = NULLRTBLOCK;
408 * Trim off tail of extent, if prod is specified.
410 if (prod > 1 && (i = maxlen % prod)) {
412 if (maxlen < minlen) {
414 * Now we can't do it, return failure status.
416 *rtblock = NULLRTBLOCK;
421 * Allocate what we can and return it.
423 error = xfs_rtallocate_range(mp, tp, bno, maxlen, rbpp, rsb);
433 * Allocate an extent of length minlen<=len<=maxlen, starting as near
434 * to bno as possible. If we don't get maxlen then use prod to trim
435 * the length, if given. The lengths are all in rtextents.
437 STATIC int /* error */
438 xfs_rtallocate_extent_near(
439 xfs_mount_t *mp, /* file system mount point */
440 xfs_trans_t *tp, /* transaction pointer */
441 xfs_rtblock_t bno, /* starting block number to allocate */
442 xfs_extlen_t minlen, /* minimum length to allocate */
443 xfs_extlen_t maxlen, /* maximum length to allocate */
444 xfs_extlen_t *len, /* out: actual length allocated */
445 struct xfs_buf **rbpp, /* in/out: summary block buffer */
446 xfs_fsblock_t *rsb, /* in/out: summary block number */
447 xfs_extlen_t prod, /* extent product factor */
448 xfs_rtblock_t *rtblock) /* out: start block allocated */
450 int any; /* any useful extents from summary */
451 xfs_rtblock_t bbno; /* bitmap block number */
452 int error; /* error value */
453 int i; /* bitmap block offset (loop control) */
454 int j; /* secondary loop control */
455 int log2len; /* log2 of minlen */
456 xfs_rtblock_t n; /* next block to try */
457 xfs_rtblock_t r; /* result block */
459 ASSERT(minlen % prod == 0);
460 ASSERT(maxlen % prod == 0);
463 * If the block number given is off the end, silently set it to
466 if (bno >= mp->m_sb.sb_rextents)
467 bno = mp->m_sb.sb_rextents - 1;
469 /* Make sure we don't run off the end of the rt volume. */
470 maxlen = xfs_rtallocate_clamp_len(mp, bno, maxlen, prod);
471 if (maxlen < minlen) {
472 *rtblock = NULLRTBLOCK;
477 * Try the exact allocation first.
479 error = xfs_rtallocate_extent_exact(mp, tp, bno, minlen, maxlen, len,
480 rbpp, rsb, prod, &r);
485 * If the exact allocation worked, return that.
487 if (r != NULLRTBLOCK) {
491 bbno = XFS_BITTOBLOCK(mp, bno);
494 log2len = xfs_highbit32(minlen);
496 * Loop over all bitmap blocks (bbno + i is current block).
500 * Get summary information of extents of all useful levels
501 * starting in this bitmap block.
503 error = xfs_rtany_summary(mp, tp, log2len, mp->m_rsumlevels - 1,
504 bbno + i, rbpp, rsb, &any);
509 * If there are any useful extents starting here, try
514 * On the positive side of the starting location.
518 * Try to allocate an extent starting in
521 error = xfs_rtallocate_extent_block(mp, tp,
522 bbno + i, minlen, maxlen, len, &n, rbpp,
528 * If it worked, return it.
530 if (r != NULLRTBLOCK) {
536 * On the negative side of the starting location.
540 * Loop backwards through the bitmap blocks from
541 * the starting point-1 up to where we are now.
542 * There should be an extent which ends in this
543 * bitmap block and is long enough.
545 for (j = -1; j > i; j--) {
547 * Grab the summary information for
550 error = xfs_rtany_summary(mp, tp,
551 log2len, mp->m_rsumlevels - 1,
552 bbno + j, rbpp, rsb, &any);
557 * If there's no extent given in the
558 * summary that means the extent we
559 * found must carry over from an
560 * earlier block. If there is an
561 * extent given, we've already tried
562 * that allocation, don't do it again.
566 error = xfs_rtallocate_extent_block(mp,
567 tp, bbno + j, minlen, maxlen,
568 len, &n, rbpp, rsb, prod, &r);
573 * If it works, return the extent.
575 if (r != NULLRTBLOCK) {
581 * There weren't intervening bitmap blocks
582 * with a long enough extent, or the
583 * allocation didn't work for some reason
584 * (i.e. it's a little * too short).
585 * Try to allocate from the summary block
588 error = xfs_rtallocate_extent_block(mp, tp,
589 bbno + i, minlen, maxlen, len, &n, rbpp,
595 * If it works, return the extent.
597 if (r != NULLRTBLOCK) {
604 * Loop control. If we were on the positive side, and there's
605 * still more blocks on the negative side, go there.
607 if (i > 0 && (int)bbno - i >= 0)
610 * If positive, and no more negative, but there are more
611 * positive, go there.
613 else if (i > 0 && (int)bbno + i < mp->m_sb.sb_rbmblocks - 1)
616 * If negative or 0 (just started), and there are positive
617 * blocks to go, go there. The 0 case moves to block 1.
619 else if (i <= 0 && (int)bbno - i < mp->m_sb.sb_rbmblocks - 1)
622 * If negative or 0 and there are more negative blocks,
625 else if (i <= 0 && (int)bbno + i > 0)
628 * Must be done. Return failure.
633 *rtblock = NULLRTBLOCK;
638 * Allocate an extent of length minlen<=len<=maxlen, with no position
639 * specified. If we don't get maxlen then use prod to trim
640 * the length, if given. The lengths are all in rtextents.
642 STATIC int /* error */
643 xfs_rtallocate_extent_size(
644 xfs_mount_t *mp, /* file system mount point */
645 xfs_trans_t *tp, /* transaction pointer */
646 xfs_extlen_t minlen, /* minimum length to allocate */
647 xfs_extlen_t maxlen, /* maximum length to allocate */
648 xfs_extlen_t *len, /* out: actual length allocated */
649 struct xfs_buf **rbpp, /* in/out: summary block buffer */
650 xfs_fsblock_t *rsb, /* in/out: summary block number */
651 xfs_extlen_t prod, /* extent product factor */
652 xfs_rtblock_t *rtblock) /* out: start block allocated */
654 int error; /* error value */
655 int i; /* bitmap block number */
656 int l; /* level number (loop control) */
657 xfs_rtblock_t n; /* next block to be tried */
658 xfs_rtblock_t r; /* result block number */
659 xfs_suminfo_t sum; /* summary information for extents */
661 ASSERT(minlen % prod == 0);
662 ASSERT(maxlen % prod == 0);
666 * Loop over all the levels starting with maxlen.
667 * At each level, look at all the bitmap blocks, to see if there
668 * are extents starting there that are long enough (>= maxlen).
669 * Note, only on the initial level can the allocation fail if
670 * the summary says there's an extent.
672 for (l = xfs_highbit32(maxlen); l < mp->m_rsumlevels; l++) {
674 * Loop over all the bitmap blocks.
676 for (i = 0; i < mp->m_sb.sb_rbmblocks; i++) {
678 * Get the summary for this level/block.
680 error = xfs_rtget_summary(mp, tp, l, i, rbpp, rsb,
686 * Nothing there, on to the next block.
691 * Try allocating the extent.
693 error = xfs_rtallocate_extent_block(mp, tp, i, maxlen,
694 maxlen, len, &n, rbpp, rsb, prod, &r);
699 * If it worked, return that.
701 if (r != NULLRTBLOCK) {
706 * If the "next block to try" returned from the
707 * allocator is beyond the next bitmap block,
708 * skip to that bitmap block.
710 if (XFS_BITTOBLOCK(mp, n) > i + 1)
711 i = XFS_BITTOBLOCK(mp, n) - 1;
715 * Didn't find any maxlen blocks. Try smaller ones, unless
716 * we're asking for a fixed size extent.
718 if (minlen > --maxlen) {
719 *rtblock = NULLRTBLOCK;
726 * Loop over sizes, from maxlen down to minlen.
727 * This time, when we do the allocations, allow smaller ones
730 for (l = xfs_highbit32(maxlen); l >= xfs_highbit32(minlen); l--) {
732 * Loop over all the bitmap blocks, try an allocation
733 * starting in that block.
735 for (i = 0; i < mp->m_sb.sb_rbmblocks; i++) {
737 * Get the summary information for this level/block.
739 error = xfs_rtget_summary(mp, tp, l, i, rbpp, rsb,
745 * If nothing there, go on to next.
750 * Try the allocation. Make sure the specified
751 * minlen/maxlen are in the possible range for
752 * this summary level.
754 error = xfs_rtallocate_extent_block(mp, tp, i,
755 XFS_RTMAX(minlen, 1 << l),
756 XFS_RTMIN(maxlen, (1 << (l + 1)) - 1),
757 len, &n, rbpp, rsb, prod, &r);
762 * If it worked, return that extent.
764 if (r != NULLRTBLOCK) {
769 * If the "next block to try" returned from the
770 * allocator is beyond the next bitmap block,
771 * skip to that bitmap block.
773 if (XFS_BITTOBLOCK(mp, n) > i + 1)
774 i = XFS_BITTOBLOCK(mp, n) - 1;
778 * Got nothing, return failure.
780 *rtblock = NULLRTBLOCK;
785 * Allocate space to the bitmap or summary file, and zero it, for growfs.
789 struct xfs_mount *mp, /* file system mount point */
790 xfs_extlen_t oblocks, /* old count of blocks */
791 xfs_extlen_t nblocks, /* new count of blocks */
792 struct xfs_inode *ip) /* inode (bitmap/summary) */
794 xfs_fileoff_t bno; /* block number in file */
795 struct xfs_buf *bp; /* temporary buffer for zeroing */
796 xfs_daddr_t d; /* disk block address */
797 int error; /* error return value */
798 xfs_fsblock_t fsbno; /* filesystem block for bno */
799 struct xfs_bmbt_irec map; /* block map output */
800 int nmap; /* number of block maps */
801 int resblks; /* space reservation */
802 enum xfs_blft buf_type;
803 struct xfs_trans *tp;
805 if (ip == mp->m_rsumip)
806 buf_type = XFS_BLFT_RTSUMMARY_BUF;
808 buf_type = XFS_BLFT_RTBITMAP_BUF;
811 * Allocate space to the file, as necessary.
813 while (oblocks < nblocks) {
814 resblks = XFS_GROWFSRT_SPACE_RES(mp, nblocks - oblocks);
816 * Reserve space & log for one extent added to the file.
818 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growrtalloc, resblks,
825 xfs_ilock(ip, XFS_ILOCK_EXCL);
826 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
828 error = xfs_iext_count_may_overflow(ip, XFS_DATA_FORK,
829 XFS_IEXT_ADD_NOSPLIT_CNT);
831 error = xfs_iext_count_upgrade(tp, ip,
832 XFS_IEXT_ADD_NOSPLIT_CNT);
834 goto out_trans_cancel;
837 * Allocate blocks to the bitmap file.
840 error = xfs_bmapi_write(tp, ip, oblocks, nblocks - oblocks,
841 XFS_BMAPI_METADATA, 0, &map, &nmap);
842 if (!error && nmap < 1)
845 goto out_trans_cancel;
847 * Free any blocks freed up in the transaction, then commit.
849 error = xfs_trans_commit(tp);
853 * Now we need to clear the allocated blocks.
854 * Do this one block per transaction, to keep it simple.
856 for (bno = map.br_startoff, fsbno = map.br_startblock;
857 bno < map.br_startoff + map.br_blockcount;
860 * Reserve log for one block zeroing.
862 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growrtzero,
867 * Lock the bitmap inode.
869 xfs_ilock(ip, XFS_ILOCK_EXCL);
870 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
872 * Get a buffer for the block.
874 d = XFS_FSB_TO_DADDR(mp, fsbno);
875 error = xfs_trans_get_buf(tp, mp->m_ddev_targp, d,
876 mp->m_bsize, 0, &bp);
878 goto out_trans_cancel;
880 xfs_trans_buf_set_type(tp, bp, buf_type);
881 bp->b_ops = &xfs_rtbuf_ops;
882 memset(bp->b_addr, 0, mp->m_sb.sb_blocksize);
883 xfs_trans_log_buf(tp, bp, 0, mp->m_sb.sb_blocksize - 1);
885 * Commit the transaction.
887 error = xfs_trans_commit(tp);
892 * Go on to the next extent, if any.
894 oblocks = map.br_startoff + map.br_blockcount;
900 xfs_trans_cancel(tp);
905 xfs_alloc_rsum_cache(
906 xfs_mount_t *mp, /* file system mount structure */
907 xfs_extlen_t rbmblocks) /* number of rt bitmap blocks */
910 * The rsum cache is initialized to all zeroes, which is trivially a
911 * lower bound on the minimum level with any free extents. We can
912 * continue without the cache if it couldn't be allocated.
914 mp->m_rsum_cache = kvzalloc(rbmblocks, GFP_KERNEL);
915 if (!mp->m_rsum_cache)
916 xfs_warn(mp, "could not allocate realtime summary cache");
920 * Visible (exported) functions.
924 * Grow the realtime area of the filesystem.
928 xfs_mount_t *mp, /* mount point for filesystem */
929 xfs_growfs_rt_t *in) /* growfs rt input struct */
931 xfs_rtblock_t bmbno; /* bitmap block number */
932 struct xfs_buf *bp; /* temporary buffer */
933 int error; /* error return value */
934 xfs_mount_t *nmp; /* new (fake) mount structure */
935 xfs_rfsblock_t nrblocks; /* new number of realtime blocks */
936 xfs_extlen_t nrbmblocks; /* new number of rt bitmap blocks */
937 xfs_rtblock_t nrextents; /* new number of realtime extents */
938 uint8_t nrextslog; /* new log2 of sb_rextents */
939 xfs_extlen_t nrsumblocks; /* new number of summary blocks */
940 uint nrsumlevels; /* new rt summary levels */
941 uint nrsumsize; /* new size of rt summary, bytes */
942 xfs_sb_t *nsbp; /* new superblock */
943 xfs_extlen_t rbmblocks; /* current number of rt bitmap blocks */
944 xfs_extlen_t rsumblocks; /* current number of rt summary blks */
945 xfs_sb_t *sbp; /* old superblock */
946 xfs_fsblock_t sumbno; /* summary block number */
947 uint8_t *rsum_cache; /* old summary cache */
951 if (!capable(CAP_SYS_ADMIN))
954 /* Needs to have been mounted with an rt device. */
955 if (!XFS_IS_REALTIME_MOUNT(mp))
958 * Mount should fail if the rt bitmap/summary files don't load, but
959 * we'll check anyway.
961 if (!mp->m_rbmip || !mp->m_rsumip)
964 /* Shrink not supported. */
965 if (in->newblocks <= sbp->sb_rblocks)
968 /* Can only change rt extent size when adding rt volume. */
969 if (sbp->sb_rblocks > 0 && in->extsize != sbp->sb_rextsize)
972 /* Range check the extent size. */
973 if (XFS_FSB_TO_B(mp, in->extsize) > XFS_MAX_RTEXTSIZE ||
974 XFS_FSB_TO_B(mp, in->extsize) < XFS_MIN_RTEXTSIZE)
977 /* Unsupported realtime features. */
978 if (xfs_has_rmapbt(mp) || xfs_has_reflink(mp) || xfs_has_quota(mp))
981 nrblocks = in->newblocks;
982 error = xfs_sb_validate_fsb_count(sbp, nrblocks);
986 * Read in the last block of the device, make sure it exists.
988 error = xfs_buf_read_uncached(mp->m_rtdev_targp,
989 XFS_FSB_TO_BB(mp, nrblocks - 1),
990 XFS_FSB_TO_BB(mp, 1), 0, &bp, NULL);
996 * Calculate new parameters. These are the final values to be reached.
998 nrextents = nrblocks;
999 do_div(nrextents, in->extsize);
1000 nrbmblocks = howmany_64(nrextents, NBBY * sbp->sb_blocksize);
1001 nrextslog = xfs_highbit32(nrextents);
1002 nrsumlevels = nrextslog + 1;
1003 nrsumsize = (uint)sizeof(xfs_suminfo_t) * nrsumlevels * nrbmblocks;
1004 nrsumblocks = XFS_B_TO_FSB(mp, nrsumsize);
1005 nrsumsize = XFS_FSB_TO_B(mp, nrsumblocks);
1007 * New summary size can't be more than half the size of
1008 * the log. This prevents us from getting a log overflow,
1009 * since we'll log basically the whole summary file at once.
1011 if (nrsumblocks > (mp->m_sb.sb_logblocks >> 1))
1014 * Get the old block counts for bitmap and summary inodes.
1015 * These can't change since other growfs callers are locked out.
1017 rbmblocks = XFS_B_TO_FSB(mp, mp->m_rbmip->i_disk_size);
1018 rsumblocks = XFS_B_TO_FSB(mp, mp->m_rsumip->i_disk_size);
1020 * Allocate space to the bitmap and summary files, as necessary.
1022 error = xfs_growfs_rt_alloc(mp, rbmblocks, nrbmblocks, mp->m_rbmip);
1025 error = xfs_growfs_rt_alloc(mp, rsumblocks, nrsumblocks, mp->m_rsumip);
1029 rsum_cache = mp->m_rsum_cache;
1030 if (nrbmblocks != sbp->sb_rbmblocks)
1031 xfs_alloc_rsum_cache(mp, nrbmblocks);
1034 * Allocate a new (fake) mount/sb.
1036 nmp = kmem_alloc(sizeof(*nmp), 0);
1038 * Loop over the bitmap blocks.
1039 * We will do everything one bitmap block at a time.
1040 * Skip the current block if it is exactly full.
1041 * This also deals with the case where there were no rtextents before.
1043 for (bmbno = sbp->sb_rbmblocks -
1044 ((sbp->sb_rextents & ((1 << mp->m_blkbit_log) - 1)) != 0);
1047 struct xfs_trans *tp;
1048 xfs_rfsblock_t nrblocks_step;
1053 * Calculate new sb and mount fields for this round.
1055 nsbp->sb_rextsize = in->extsize;
1056 nsbp->sb_rbmblocks = bmbno + 1;
1057 nrblocks_step = (bmbno + 1) * NBBY * nsbp->sb_blocksize *
1059 nsbp->sb_rblocks = min(nrblocks, nrblocks_step);
1060 nsbp->sb_rextents = nsbp->sb_rblocks;
1061 do_div(nsbp->sb_rextents, nsbp->sb_rextsize);
1062 ASSERT(nsbp->sb_rextents != 0);
1063 nsbp->sb_rextslog = xfs_highbit32(nsbp->sb_rextents);
1064 nrsumlevels = nmp->m_rsumlevels = nsbp->sb_rextslog + 1;
1066 (uint)sizeof(xfs_suminfo_t) * nrsumlevels *
1068 nrsumblocks = XFS_B_TO_FSB(mp, nrsumsize);
1069 nmp->m_rsumsize = nrsumsize = XFS_FSB_TO_B(mp, nrsumblocks);
1071 * Start a transaction, get the log reservation.
1073 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growrtfree, 0, 0, 0,
1078 * Lock out other callers by grabbing the bitmap inode lock.
1080 xfs_ilock(mp->m_rbmip, XFS_ILOCK_EXCL | XFS_ILOCK_RTBITMAP);
1081 xfs_trans_ijoin(tp, mp->m_rbmip, XFS_ILOCK_EXCL);
1083 * Update the bitmap inode's size ondisk and incore. We need
1084 * to update the incore size so that inode inactivation won't
1085 * punch what it thinks are "posteof" blocks.
1087 mp->m_rbmip->i_disk_size =
1088 nsbp->sb_rbmblocks * nsbp->sb_blocksize;
1089 i_size_write(VFS_I(mp->m_rbmip), mp->m_rbmip->i_disk_size);
1090 xfs_trans_log_inode(tp, mp->m_rbmip, XFS_ILOG_CORE);
1092 * Get the summary inode into the transaction.
1094 xfs_ilock(mp->m_rsumip, XFS_ILOCK_EXCL | XFS_ILOCK_RTSUM);
1095 xfs_trans_ijoin(tp, mp->m_rsumip, XFS_ILOCK_EXCL);
1097 * Update the summary inode's size. We need to update the
1098 * incore size so that inode inactivation won't punch what it
1099 * thinks are "posteof" blocks.
1101 mp->m_rsumip->i_disk_size = nmp->m_rsumsize;
1102 i_size_write(VFS_I(mp->m_rsumip), mp->m_rsumip->i_disk_size);
1103 xfs_trans_log_inode(tp, mp->m_rsumip, XFS_ILOG_CORE);
1105 * Copy summary data from old to new sizes.
1106 * Do this when the real size (not block-aligned) changes.
1108 if (sbp->sb_rbmblocks != nsbp->sb_rbmblocks ||
1109 mp->m_rsumlevels != nmp->m_rsumlevels) {
1110 error = xfs_rtcopy_summary(mp, nmp, tp);
1115 * Update superblock fields.
1117 if (nsbp->sb_rextsize != sbp->sb_rextsize)
1118 xfs_trans_mod_sb(tp, XFS_TRANS_SB_REXTSIZE,
1119 nsbp->sb_rextsize - sbp->sb_rextsize);
1120 if (nsbp->sb_rbmblocks != sbp->sb_rbmblocks)
1121 xfs_trans_mod_sb(tp, XFS_TRANS_SB_RBMBLOCKS,
1122 nsbp->sb_rbmblocks - sbp->sb_rbmblocks);
1123 if (nsbp->sb_rblocks != sbp->sb_rblocks)
1124 xfs_trans_mod_sb(tp, XFS_TRANS_SB_RBLOCKS,
1125 nsbp->sb_rblocks - sbp->sb_rblocks);
1126 if (nsbp->sb_rextents != sbp->sb_rextents)
1127 xfs_trans_mod_sb(tp, XFS_TRANS_SB_REXTENTS,
1128 nsbp->sb_rextents - sbp->sb_rextents);
1129 if (nsbp->sb_rextslog != sbp->sb_rextslog)
1130 xfs_trans_mod_sb(tp, XFS_TRANS_SB_REXTSLOG,
1131 nsbp->sb_rextslog - sbp->sb_rextslog);
1136 error = xfs_rtfree_range(nmp, tp, sbp->sb_rextents,
1137 nsbp->sb_rextents - sbp->sb_rextents, &bp, &sumbno);
1140 xfs_trans_cancel(tp);
1144 * Mark more blocks free in the superblock.
1146 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FREXTENTS,
1147 nsbp->sb_rextents - sbp->sb_rextents);
1149 * Update mp values into the real mp structure.
1151 mp->m_rsumlevels = nrsumlevels;
1152 mp->m_rsumsize = nrsumsize;
1154 error = xfs_trans_commit(tp);
1158 /* Ensure the mount RT feature flag is now set. */
1159 mp->m_features |= XFS_FEAT_REALTIME;
1164 /* Update secondary superblocks now the physical grow has completed */
1165 error = xfs_update_secondary_sbs(mp);
1169 * Free the fake mp structure.
1174 * If we had to allocate a new rsum_cache, we either need to free the
1175 * old one (if we succeeded) or free the new one and restore the old one
1176 * (if there was an error).
1178 if (rsum_cache != mp->m_rsum_cache) {
1180 kmem_free(mp->m_rsum_cache);
1181 mp->m_rsum_cache = rsum_cache;
1183 kmem_free(rsum_cache);
1191 * Allocate an extent in the realtime subvolume, with the usual allocation
1192 * parameters. The length units are all in realtime extents, as is the
1193 * result block number.
1196 xfs_rtallocate_extent(
1197 xfs_trans_t *tp, /* transaction pointer */
1198 xfs_rtblock_t bno, /* starting block number to allocate */
1199 xfs_extlen_t minlen, /* minimum length to allocate */
1200 xfs_extlen_t maxlen, /* maximum length to allocate */
1201 xfs_extlen_t *len, /* out: actual length allocated */
1202 int wasdel, /* was a delayed allocation extent */
1203 xfs_extlen_t prod, /* extent product factor */
1204 xfs_rtblock_t *rtblock) /* out: start block allocated */
1206 xfs_mount_t *mp = tp->t_mountp;
1207 int error; /* error value */
1208 xfs_rtblock_t r; /* result allocated block */
1209 xfs_fsblock_t sb; /* summary file block number */
1210 struct xfs_buf *sumbp; /* summary file block buffer */
1212 ASSERT(xfs_isilocked(mp->m_rbmip, XFS_ILOCK_EXCL));
1213 ASSERT(minlen > 0 && minlen <= maxlen);
1216 * If prod is set then figure out what to do to minlen and maxlen.
1221 if ((i = maxlen % prod))
1223 if ((i = minlen % prod))
1225 if (maxlen < minlen) {
1226 *rtblock = NULLRTBLOCK;
1234 error = xfs_rtallocate_extent_size(mp, tp, minlen, maxlen, len,
1235 &sumbp, &sb, prod, &r);
1237 error = xfs_rtallocate_extent_near(mp, tp, bno, minlen, maxlen,
1238 len, &sumbp, &sb, prod, &r);
1245 * If it worked, update the superblock.
1247 if (r != NULLRTBLOCK) {
1248 long slen = (long)*len;
1250 ASSERT(*len >= minlen && *len <= maxlen);
1252 xfs_trans_mod_sb(tp, XFS_TRANS_SB_RES_FREXTENTS, -slen);
1254 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FREXTENTS, -slen);
1255 } else if (prod > 1) {
1265 * Initialize realtime fields in the mount structure.
1269 struct xfs_mount *mp) /* file system mount structure */
1271 struct xfs_buf *bp; /* buffer for last block of subvolume */
1272 struct xfs_sb *sbp; /* filesystem superblock copy in mount */
1273 xfs_daddr_t d; /* address of last block of subvolume */
1277 if (sbp->sb_rblocks == 0)
1279 if (mp->m_rtdev_targp == NULL) {
1281 "Filesystem has a realtime volume, use rtdev=device option");
1284 mp->m_rsumlevels = sbp->sb_rextslog + 1;
1286 (uint)sizeof(xfs_suminfo_t) * mp->m_rsumlevels *
1288 mp->m_rsumsize = roundup(mp->m_rsumsize, sbp->sb_blocksize);
1289 mp->m_rbmip = mp->m_rsumip = NULL;
1291 * Check that the realtime section is an ok size.
1293 d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_rblocks);
1294 if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_rblocks) {
1295 xfs_warn(mp, "realtime mount -- %llu != %llu",
1296 (unsigned long long) XFS_BB_TO_FSB(mp, d),
1297 (unsigned long long) mp->m_sb.sb_rblocks);
1300 error = xfs_buf_read_uncached(mp->m_rtdev_targp,
1301 d - XFS_FSB_TO_BB(mp, 1),
1302 XFS_FSB_TO_BB(mp, 1), 0, &bp, NULL);
1304 xfs_warn(mp, "realtime device size check failed");
1312 xfs_rtalloc_count_frextent(
1313 struct xfs_mount *mp,
1314 struct xfs_trans *tp,
1315 const struct xfs_rtalloc_rec *rec,
1318 uint64_t *valp = priv;
1320 *valp += rec->ar_extcount;
1325 * Reinitialize the number of free realtime extents from the realtime bitmap.
1326 * Callers must ensure that there is no other activity in the filesystem.
1329 xfs_rtalloc_reinit_frextents(
1330 struct xfs_mount *mp)
1335 xfs_ilock(mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
1336 error = xfs_rtalloc_query_all(mp, NULL, xfs_rtalloc_count_frextent,
1338 xfs_iunlock(mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
1342 spin_lock(&mp->m_sb_lock);
1343 mp->m_sb.sb_frextents = val;
1344 spin_unlock(&mp->m_sb_lock);
1345 percpu_counter_set(&mp->m_frextents, mp->m_sb.sb_frextents);
1350 * Read in the bmbt of an rt metadata inode so that we never have to load them
1351 * at runtime. This enables the use of shared ILOCKs for rtbitmap scans. Use
1352 * an empty transaction to avoid deadlocking on loops in the bmbt.
1355 xfs_rtmount_iread_extents(
1356 struct xfs_inode *ip,
1357 unsigned int lock_class)
1359 struct xfs_trans *tp;
1362 error = xfs_trans_alloc_empty(ip->i_mount, &tp);
1366 xfs_ilock(ip, XFS_ILOCK_EXCL | lock_class);
1368 error = xfs_iread_extents(tp, ip, XFS_DATA_FORK);
1372 if (xfs_inode_has_attr_fork(ip)) {
1373 error = xfs_iread_extents(tp, ip, XFS_ATTR_FORK);
1379 xfs_iunlock(ip, XFS_ILOCK_EXCL | lock_class);
1380 xfs_trans_cancel(tp);
1385 * Get the bitmap and summary inodes and the summary cache into the mount
1386 * structure at mount time.
1390 xfs_mount_t *mp) /* file system mount structure */
1392 int error; /* error return value */
1396 error = xfs_iget(mp, NULL, sbp->sb_rbmino, 0, 0, &mp->m_rbmip);
1399 ASSERT(mp->m_rbmip != NULL);
1401 error = xfs_rtmount_iread_extents(mp->m_rbmip, XFS_ILOCK_RTBITMAP);
1403 goto out_rele_bitmap;
1405 error = xfs_iget(mp, NULL, sbp->sb_rsumino, 0, 0, &mp->m_rsumip);
1407 goto out_rele_bitmap;
1408 ASSERT(mp->m_rsumip != NULL);
1410 error = xfs_rtmount_iread_extents(mp->m_rsumip, XFS_ILOCK_RTSUM);
1412 goto out_rele_summary;
1414 xfs_alloc_rsum_cache(mp, sbp->sb_rbmblocks);
1418 xfs_irele(mp->m_rsumip);
1420 xfs_irele(mp->m_rbmip);
1425 xfs_rtunmount_inodes(
1426 struct xfs_mount *mp)
1428 kmem_free(mp->m_rsum_cache);
1430 xfs_irele(mp->m_rbmip);
1432 xfs_irele(mp->m_rsumip);
1436 * Pick an extent for allocation at the start of a new realtime file.
1437 * Use the sequence number stored in the atime field of the bitmap inode.
1438 * Translate this to a fraction of the rtextents, and return the product
1439 * of rtextents and the fraction.
1440 * The fraction sequence is 0, 1/2, 1/4, 3/4, 1/8, ..., 7/8, 1/16, ...
1444 xfs_mount_t *mp, /* file system mount point */
1445 xfs_trans_t *tp, /* transaction pointer */
1446 xfs_extlen_t len, /* allocation length (rtextents) */
1447 xfs_rtblock_t *pick) /* result rt extent */
1449 xfs_rtblock_t b; /* result block */
1450 int log2; /* log of sequence number */
1451 uint64_t resid; /* residual after log removed */
1452 uint64_t seq; /* sequence number of file creation */
1453 uint64_t *seqp; /* pointer to seqno in inode */
1455 ASSERT(xfs_isilocked(mp->m_rbmip, XFS_ILOCK_EXCL));
1457 seqp = (uint64_t *)&VFS_I(mp->m_rbmip)->i_atime;
1458 if (!(mp->m_rbmip->i_diflags & XFS_DIFLAG_NEWRTBM)) {
1459 mp->m_rbmip->i_diflags |= XFS_DIFLAG_NEWRTBM;
1463 if ((log2 = xfs_highbit64(seq)) == -1)
1466 resid = seq - (1ULL << log2);
1467 b = (mp->m_sb.sb_rextents * ((resid << 1) + 1ULL)) >>
1469 if (b >= mp->m_sb.sb_rextents)
1470 div64_u64_rem(b, mp->m_sb.sb_rextents, &b);
1471 if (b + len > mp->m_sb.sb_rextents)
1472 b = mp->m_sb.sb_rextents - len;
1475 xfs_trans_log_inode(tp, mp->m_rbmip, XFS_ILOG_CORE);