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_bmap_util.h"
18 #include "xfs_trans.h"
19 #include "xfs_trans_space.h"
20 #include "xfs_icache.h"
21 #include "xfs_rtalloc.h"
23 #include "xfs_rtbitmap.h"
24 #include "xfs_quota.h"
27 * Return whether there are any free extents in the size range given
28 * by low and high, for the bitmap block bbno.
32 struct xfs_rtalloc_args *args,
33 int low, /* low log2 extent size */
34 int high, /* high log2 extent size */
35 xfs_fileoff_t bbno, /* bitmap block number */
36 int *maxlog) /* out: max log2 extent size free */
38 struct xfs_mount *mp = args->mp;
40 int log; /* loop counter, log2 of ext. size */
41 xfs_suminfo_t sum; /* summary data */
43 /* There are no extents at levels >= m_rsum_cache[bbno]. */
44 if (mp->m_rsum_cache) {
45 high = min(high, mp->m_rsum_cache[bbno] - 1);
53 * Loop over logs of extent sizes.
55 for (log = high; log >= low; log--) {
57 * Get one summary datum.
59 error = xfs_rtget_summary(args, log, bbno, &sum);
64 * If there are any, return success.
72 * Found nothing, return failure.
76 /* There were no extents at levels > log. */
77 if (mp->m_rsum_cache && log + 1 < mp->m_rsum_cache[bbno])
78 mp->m_rsum_cache[bbno] = log + 1;
84 * Copy and transform the summary file, given the old and new
85 * parameters in the mount structures.
89 struct xfs_rtalloc_args *oargs,
90 struct xfs_rtalloc_args *nargs)
92 xfs_fileoff_t bbno; /* bitmap block number */
94 int log; /* summary level number (log length) */
95 xfs_suminfo_t sum; /* summary data */
97 for (log = oargs->mp->m_rsumlevels - 1; log >= 0; log--) {
98 for (bbno = oargs->mp->m_sb.sb_rbmblocks - 1;
99 (xfs_srtblock_t)bbno >= 0;
101 error = xfs_rtget_summary(oargs, log, bbno, &sum);
106 error = xfs_rtmodify_summary(oargs, log, bbno, -sum);
109 error = xfs_rtmodify_summary(nargs, log, bbno, sum);
117 xfs_rtbuf_cache_relse(oargs);
121 * Mark an extent specified by start and len allocated.
122 * Updates all the summary information as well as the bitmap.
125 xfs_rtallocate_range(
126 struct xfs_rtalloc_args *args,
127 xfs_rtxnum_t start, /* start rtext to allocate */
128 xfs_rtxlen_t len) /* in/out: summary block number */
130 struct xfs_mount *mp = args->mp;
131 xfs_rtxnum_t end; /* end of the allocated rtext */
133 xfs_rtxnum_t postblock = 0; /* first rtext allocated > end */
134 xfs_rtxnum_t preblock = 0; /* first rtext allocated < start */
136 end = start + len - 1;
138 * Assume we're allocating out of the middle of a free extent.
139 * We need to find the beginning and end of the extent so we can
140 * properly update the summary.
142 error = xfs_rtfind_back(args, start, 0, &preblock);
147 * Find the next allocated block (end of free extent).
149 error = xfs_rtfind_forw(args, end, mp->m_sb.sb_rextents - 1,
155 * Decrement the summary information corresponding to the entire
158 error = xfs_rtmodify_summary(args,
159 xfs_highbit64(postblock + 1 - preblock),
160 xfs_rtx_to_rbmblock(mp, preblock), -1);
165 * If there are blocks not being allocated at the front of the
166 * old extent, add summary data for them to be free.
168 if (preblock < start) {
169 error = xfs_rtmodify_summary(args,
170 xfs_highbit64(start - preblock),
171 xfs_rtx_to_rbmblock(mp, preblock), 1);
177 * If there are blocks not being allocated at the end of the
178 * old extent, add summary data for them to be free.
180 if (postblock > end) {
181 error = xfs_rtmodify_summary(args,
182 xfs_highbit64(postblock - end),
183 xfs_rtx_to_rbmblock(mp, end + 1), 1);
189 * Modify the bitmap to mark this extent allocated.
191 return xfs_rtmodify_range(args, start, len, 0);
195 * Make sure we don't run off the end of the rt volume. Be careful that
196 * adjusting maxlen downwards doesn't cause us to fail the alignment checks.
198 static inline xfs_rtxlen_t
199 xfs_rtallocate_clamp_len(
200 struct xfs_mount *mp,
201 xfs_rtxnum_t startrtx,
207 ret = min(mp->m_sb.sb_rextents, startrtx + rtxlen) - startrtx;
208 return rounddown(ret, prod);
212 * Attempt to allocate an extent minlen<=len<=maxlen starting from
213 * bitmap block bbno. If we don't get maxlen then use prod to trim
214 * the length, if given. Returns error; returns starting block in *rtx.
215 * The lengths are all in rtextents.
218 xfs_rtallocate_extent_block(
219 struct xfs_rtalloc_args *args,
220 xfs_fileoff_t bbno, /* bitmap block number */
221 xfs_rtxlen_t minlen, /* minimum length to allocate */
222 xfs_rtxlen_t maxlen, /* maximum length to allocate */
223 xfs_rtxlen_t *len, /* out: actual length allocated */
224 xfs_rtxnum_t *nextp, /* out: next rtext to try */
225 xfs_rtxlen_t prod, /* extent product factor */
226 xfs_rtxnum_t *rtx) /* out: start rtext allocated */
228 struct xfs_mount *mp = args->mp;
229 xfs_rtxnum_t besti; /* best rtext found so far */
230 xfs_rtxnum_t bestlen;/* best length found so far */
231 xfs_rtxnum_t end; /* last rtext in chunk */
233 xfs_rtxnum_t i; /* current rtext trying */
234 xfs_rtxnum_t next; /* next rtext to try */
235 int stat; /* status from internal calls */
238 * Loop over all the extents starting in this bitmap block,
239 * looking for one that's long enough.
241 for (i = xfs_rbmblock_to_rtx(mp, bbno), besti = -1, bestlen = 0,
242 end = xfs_rbmblock_to_rtx(mp, bbno + 1) - 1;
245 /* Make sure we don't scan off the end of the rt volume. */
246 maxlen = xfs_rtallocate_clamp_len(mp, i, maxlen, prod);
249 * See if there's a free extent of maxlen starting at i.
250 * If it's not so then next will contain the first non-free.
252 error = xfs_rtcheck_range(args, i, maxlen, 1, &next, &stat);
257 * i for maxlen is all free, allocate and return that.
265 * In the case where we have a variable-sized allocation
266 * request, figure out how big this free piece is,
267 * and if it's big enough for the minimum, and the best
268 * so far, remember it.
270 if (minlen < maxlen) {
271 xfs_rtxnum_t thislen; /* this extent size */
274 if (thislen >= minlen && thislen > bestlen) {
280 * If not done yet, find the start of the next free space.
284 error = xfs_rtfind_forw(args, next, end, &i);
290 * Searched the whole thing & didn't find a maxlen free extent.
292 if (minlen > maxlen || besti == -1) {
294 * Allocation failed. Set *nextp to the next block to try.
301 * If size should be a multiple of prod, make that so.
304 xfs_rtxlen_t p; /* amount to trim length by */
306 div_u64_rem(bestlen, prod, &p);
312 * Allocate besti for bestlen & return that.
315 error = xfs_rtallocate_range(args, besti, bestlen);
324 * Allocate an extent of length minlen<=len<=maxlen, starting at block
325 * bno. If we don't get maxlen then use prod to trim the length, if given.
326 * Returns error; returns starting block in *rtx.
327 * The lengths are all in rtextents.
330 xfs_rtallocate_extent_exact(
331 struct xfs_rtalloc_args *args,
332 xfs_rtxnum_t start, /* starting rtext number to allocate */
333 xfs_rtxlen_t minlen, /* minimum length to allocate */
334 xfs_rtxlen_t maxlen, /* maximum length to allocate */
335 xfs_rtxlen_t *len, /* out: actual length allocated */
336 xfs_rtxlen_t prod, /* extent product factor */
337 xfs_rtxnum_t *rtx) /* out: start rtext allocated */
340 xfs_rtxlen_t i; /* extent length trimmed due to prod */
341 int isfree; /* extent is free */
342 xfs_rtxnum_t next; /* next rtext to try (dummy) */
344 ASSERT(minlen % prod == 0);
345 ASSERT(maxlen % prod == 0);
347 * Check if the range in question (for maxlen) is free.
349 error = xfs_rtcheck_range(args, start, maxlen, 1, &next, &isfree);
355 * If not, allocate what there is, if it's at least minlen.
357 maxlen = next - start;
362 * Trim off tail of extent, if prod is specified.
364 if (prod > 1 && (i = maxlen % prod)) {
372 * Allocate what we can and return it.
374 error = xfs_rtallocate_range(args, start, maxlen);
383 * Allocate an extent of length minlen<=len<=maxlen, starting as near
384 * to start as possible. If we don't get maxlen then use prod to trim
385 * the length, if given. The lengths are all in rtextents.
388 xfs_rtallocate_extent_near(
389 struct xfs_rtalloc_args *args,
390 xfs_rtxnum_t start, /* starting rtext number to allocate */
391 xfs_rtxlen_t minlen, /* minimum length to allocate */
392 xfs_rtxlen_t maxlen, /* maximum length to allocate */
393 xfs_rtxlen_t *len, /* out: actual length allocated */
394 xfs_rtxlen_t prod, /* extent product factor */
395 xfs_rtxnum_t *rtx) /* out: start rtext allocated */
397 struct xfs_mount *mp = args->mp;
398 int maxlog; /* max useful extent from summary */
399 xfs_fileoff_t bbno; /* bitmap block number */
401 int i; /* bitmap block offset (loop control) */
402 int j; /* secondary loop control */
403 int log2len; /* log2 of minlen */
404 xfs_rtxnum_t n; /* next rtext to try */
406 ASSERT(minlen % prod == 0);
407 ASSERT(maxlen % prod == 0);
410 * If the block number given is off the end, silently set it to
413 if (start >= mp->m_sb.sb_rextents)
414 start = mp->m_sb.sb_rextents - 1;
416 /* Make sure we don't run off the end of the rt volume. */
417 maxlen = xfs_rtallocate_clamp_len(mp, start, maxlen, prod);
422 * Try the exact allocation first.
424 error = xfs_rtallocate_extent_exact(args, start, minlen, maxlen, len,
426 if (error != -ENOSPC)
430 bbno = xfs_rtx_to_rbmblock(mp, start);
434 log2len = xfs_highbit32(minlen);
436 * Loop over all bitmap blocks (bbno + i is current block).
440 * Get summary information of extents of all useful levels
441 * starting in this bitmap block.
443 error = xfs_rtany_summary(args, log2len, mp->m_rsumlevels - 1,
449 * If there are any useful extents starting here, try
453 xfs_extlen_t maxavail =
454 min_t(xfs_rtblock_t, maxlen,
455 (1ULL << (maxlog + 1)) - 1);
457 * On the positive side of the starting location.
461 * Try to allocate an extent starting in
464 error = xfs_rtallocate_extent_block(args,
465 bbno + i, minlen, maxavail, len,
467 if (error != -ENOSPC)
471 * On the negative side of the starting location.
477 * Loop backwards to find the end of the extent
478 * we found in the realtime summary.
480 * maxblocks is the maximum possible number of
481 * bitmap blocks from the start of the extent
482 * to the end of the extent.
486 else if (maxlog < mp->m_blkbit_log)
489 maxblocks = 2 << (maxlog - mp->m_blkbit_log);
492 * We need to check bbno + i + maxblocks down to
493 * bbno + i. We already checked bbno down to
494 * bbno + j + 1, so we don't need to check those
497 j = min(i + maxblocks, j);
498 for (; j >= i; j--) {
499 error = xfs_rtallocate_extent_block(args,
501 maxavail, len, &n, prod,
503 if (error != -ENOSPC)
509 * Loop control. If we were on the positive side, and there's
510 * still more blocks on the negative side, go there.
512 if (i > 0 && (int)bbno - i >= 0)
515 * If positive, and no more negative, but there are more
516 * positive, go there.
518 else if (i > 0 && (int)bbno + i < mp->m_sb.sb_rbmblocks - 1)
521 * If negative or 0 (just started), and there are positive
522 * blocks to go, go there. The 0 case moves to block 1.
524 else if (i <= 0 && (int)bbno - i < mp->m_sb.sb_rbmblocks - 1)
527 * If negative or 0 and there are more negative blocks,
530 else if (i <= 0 && (int)bbno + i > 0)
533 * Must be done. Return failure.
542 xfs_rtalloc_sumlevel(
543 struct xfs_rtalloc_args *args,
544 int l, /* level number */
545 xfs_rtxlen_t minlen, /* minimum length to allocate */
546 xfs_rtxlen_t maxlen, /* maximum length to allocate */
547 xfs_rtxlen_t prod, /* extent product factor */
548 xfs_rtxlen_t *len, /* out: actual length allocated */
549 xfs_rtxnum_t *rtx) /* out: start rtext allocated */
551 xfs_fileoff_t i; /* bitmap block number */
553 for (i = 0; i < args->mp->m_sb.sb_rbmblocks; i++) {
554 xfs_suminfo_t sum; /* summary information for extents */
555 xfs_rtxnum_t n; /* next rtext to be tried */
558 error = xfs_rtget_summary(args, l, i, &sum);
563 * Nothing there, on to the next block.
569 * Try allocating the extent.
571 error = xfs_rtallocate_extent_block(args, i, minlen, maxlen,
573 if (error != -ENOSPC)
577 * If the "next block to try" returned from the allocator is
578 * beyond the next bitmap block, skip to that bitmap block.
580 if (xfs_rtx_to_rbmblock(args->mp, n) > i + 1)
581 i = xfs_rtx_to_rbmblock(args->mp, n) - 1;
588 * Allocate an extent of length minlen<=len<=maxlen, with no position
589 * specified. If we don't get maxlen then use prod to trim
590 * the length, if given. The lengths are all in rtextents.
593 xfs_rtallocate_extent_size(
594 struct xfs_rtalloc_args *args,
595 xfs_rtxlen_t minlen, /* minimum length to allocate */
596 xfs_rtxlen_t maxlen, /* maximum length to allocate */
597 xfs_rtxlen_t *len, /* out: actual length allocated */
598 xfs_rtxlen_t prod, /* extent product factor */
599 xfs_rtxnum_t *rtx) /* out: start rtext allocated */
602 int l; /* level number (loop control) */
604 ASSERT(minlen % prod == 0);
605 ASSERT(maxlen % prod == 0);
609 * Loop over all the levels starting with maxlen.
611 * At each level, look at all the bitmap blocks, to see if there are
612 * extents starting there that are long enough (>= maxlen).
614 * Note, only on the initial level can the allocation fail if the
615 * summary says there's an extent.
617 for (l = xfs_highbit32(maxlen); l < args->mp->m_rsumlevels; l++) {
618 error = xfs_rtalloc_sumlevel(args, l, minlen, maxlen, prod, len,
620 if (error != -ENOSPC)
625 * Didn't find any maxlen blocks. Try smaller ones, unless we are
626 * looking for a fixed size extent.
628 if (minlen > --maxlen)
634 * Loop over sizes, from maxlen down to minlen.
636 * This time, when we do the allocations, allow smaller ones to succeed,
637 * but make sure the specified minlen/maxlen are in the possible range
638 * for this summary level.
640 for (l = xfs_highbit32(maxlen); l >= xfs_highbit32(minlen); l--) {
641 error = xfs_rtalloc_sumlevel(args, l,
642 max_t(xfs_rtxlen_t, minlen, 1 << l),
643 min_t(xfs_rtxlen_t, maxlen, (1 << (l + 1)) - 1),
645 if (error != -ENOSPC)
653 * Allocate space to the bitmap or summary file, and zero it, for growfs.
657 struct xfs_mount *mp, /* file system mount point */
658 xfs_extlen_t oblocks, /* old count of blocks */
659 xfs_extlen_t nblocks, /* new count of blocks */
660 struct xfs_inode *ip) /* inode (bitmap/summary) */
662 xfs_fileoff_t bno; /* block number in file */
663 struct xfs_buf *bp; /* temporary buffer for zeroing */
664 xfs_daddr_t d; /* disk block address */
665 int error; /* error return value */
666 xfs_fsblock_t fsbno; /* filesystem block for bno */
667 struct xfs_bmbt_irec map; /* block map output */
668 int nmap; /* number of block maps */
669 int resblks; /* space reservation */
670 enum xfs_blft buf_type;
671 struct xfs_trans *tp;
673 if (ip == mp->m_rsumip)
674 buf_type = XFS_BLFT_RTSUMMARY_BUF;
676 buf_type = XFS_BLFT_RTBITMAP_BUF;
679 * Allocate space to the file, as necessary.
681 while (oblocks < nblocks) {
682 resblks = XFS_GROWFSRT_SPACE_RES(mp, nblocks - oblocks);
684 * Reserve space & log for one extent added to the file.
686 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growrtalloc, resblks,
693 xfs_ilock(ip, XFS_ILOCK_EXCL);
694 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
696 error = xfs_iext_count_may_overflow(ip, XFS_DATA_FORK,
697 XFS_IEXT_ADD_NOSPLIT_CNT);
699 error = xfs_iext_count_upgrade(tp, ip,
700 XFS_IEXT_ADD_NOSPLIT_CNT);
702 goto out_trans_cancel;
705 * Allocate blocks to the bitmap file.
708 error = xfs_bmapi_write(tp, ip, oblocks, nblocks - oblocks,
709 XFS_BMAPI_METADATA, 0, &map, &nmap);
710 if (!error && nmap < 1)
713 goto out_trans_cancel;
715 * Free any blocks freed up in the transaction, then commit.
717 error = xfs_trans_commit(tp);
721 * Now we need to clear the allocated blocks.
722 * Do this one block per transaction, to keep it simple.
724 for (bno = map.br_startoff, fsbno = map.br_startblock;
725 bno < map.br_startoff + map.br_blockcount;
728 * Reserve log for one block zeroing.
730 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growrtzero,
735 * Lock the bitmap inode.
737 xfs_ilock(ip, XFS_ILOCK_EXCL);
738 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
740 * Get a buffer for the block.
742 d = XFS_FSB_TO_DADDR(mp, fsbno);
743 error = xfs_trans_get_buf(tp, mp->m_ddev_targp, d,
744 mp->m_bsize, 0, &bp);
746 goto out_trans_cancel;
748 xfs_trans_buf_set_type(tp, bp, buf_type);
749 bp->b_ops = &xfs_rtbuf_ops;
750 memset(bp->b_addr, 0, mp->m_sb.sb_blocksize);
751 xfs_trans_log_buf(tp, bp, 0, mp->m_sb.sb_blocksize - 1);
753 * Commit the transaction.
755 error = xfs_trans_commit(tp);
760 * Go on to the next extent, if any.
762 oblocks = map.br_startoff + map.br_blockcount;
768 xfs_trans_cancel(tp);
773 xfs_alloc_rsum_cache(
774 xfs_mount_t *mp, /* file system mount structure */
775 xfs_extlen_t rbmblocks) /* number of rt bitmap blocks */
778 * The rsum cache is initialized to the maximum value, which is
779 * trivially an upper bound on the maximum level with any free extents.
780 * We can continue without the cache if it couldn't be allocated.
782 mp->m_rsum_cache = kvmalloc(rbmblocks, GFP_KERNEL);
783 if (mp->m_rsum_cache)
784 memset(mp->m_rsum_cache, -1, rbmblocks);
786 xfs_warn(mp, "could not allocate realtime summary cache");
790 * Visible (exported) functions.
794 * Grow the realtime area of the filesystem.
798 xfs_mount_t *mp, /* mount point for filesystem */
799 xfs_growfs_rt_t *in) /* growfs rt input struct */
801 xfs_fileoff_t bmbno; /* bitmap block number */
802 struct xfs_buf *bp; /* temporary buffer */
803 int error; /* error return value */
804 xfs_mount_t *nmp; /* new (fake) mount structure */
805 xfs_rfsblock_t nrblocks; /* new number of realtime blocks */
806 xfs_extlen_t nrbmblocks; /* new number of rt bitmap blocks */
807 xfs_rtxnum_t nrextents; /* new number of realtime extents */
808 uint8_t nrextslog; /* new log2 of sb_rextents */
809 xfs_extlen_t nrsumblocks; /* new number of summary blocks */
810 uint nrsumlevels; /* new rt summary levels */
811 uint nrsumsize; /* new size of rt summary, bytes */
812 xfs_sb_t *nsbp; /* new superblock */
813 xfs_extlen_t rbmblocks; /* current number of rt bitmap blocks */
814 xfs_extlen_t rsumblocks; /* current number of rt summary blks */
815 xfs_sb_t *sbp; /* old superblock */
816 uint8_t *rsum_cache; /* old summary cache */
820 if (!capable(CAP_SYS_ADMIN))
823 /* Needs to have been mounted with an rt device. */
824 if (!XFS_IS_REALTIME_MOUNT(mp))
827 * Mount should fail if the rt bitmap/summary files don't load, but
828 * we'll check anyway.
830 if (!mp->m_rbmip || !mp->m_rsumip)
833 /* Shrink not supported. */
834 if (in->newblocks <= sbp->sb_rblocks)
837 /* Can only change rt extent size when adding rt volume. */
838 if (sbp->sb_rblocks > 0 && in->extsize != sbp->sb_rextsize)
841 /* Range check the extent size. */
842 if (XFS_FSB_TO_B(mp, in->extsize) > XFS_MAX_RTEXTSIZE ||
843 XFS_FSB_TO_B(mp, in->extsize) < XFS_MIN_RTEXTSIZE)
846 /* Unsupported realtime features. */
847 if (xfs_has_rmapbt(mp) || xfs_has_reflink(mp) || xfs_has_quota(mp))
850 nrblocks = in->newblocks;
851 error = xfs_sb_validate_fsb_count(sbp, nrblocks);
855 * Read in the last block of the device, make sure it exists.
857 error = xfs_buf_read_uncached(mp->m_rtdev_targp,
858 XFS_FSB_TO_BB(mp, nrblocks - 1),
859 XFS_FSB_TO_BB(mp, 1), 0, &bp, NULL);
865 * Calculate new parameters. These are the final values to be reached.
867 nrextents = nrblocks;
868 do_div(nrextents, in->extsize);
869 if (!xfs_validate_rtextents(nrextents))
871 nrbmblocks = xfs_rtbitmap_blockcount(mp, nrextents);
872 nrextslog = xfs_compute_rextslog(nrextents);
873 nrsumlevels = nrextslog + 1;
874 nrsumblocks = xfs_rtsummary_blockcount(mp, nrsumlevels, nrbmblocks);
875 nrsumsize = XFS_FSB_TO_B(mp, nrsumblocks);
877 * New summary size can't be more than half the size of
878 * the log. This prevents us from getting a log overflow,
879 * since we'll log basically the whole summary file at once.
881 if (nrsumblocks > (mp->m_sb.sb_logblocks >> 1))
884 * Get the old block counts for bitmap and summary inodes.
885 * These can't change since other growfs callers are locked out.
887 rbmblocks = XFS_B_TO_FSB(mp, mp->m_rbmip->i_disk_size);
888 rsumblocks = XFS_B_TO_FSB(mp, mp->m_rsumip->i_disk_size);
890 * Allocate space to the bitmap and summary files, as necessary.
892 error = xfs_growfs_rt_alloc(mp, rbmblocks, nrbmblocks, mp->m_rbmip);
895 error = xfs_growfs_rt_alloc(mp, rsumblocks, nrsumblocks, mp->m_rsumip);
899 rsum_cache = mp->m_rsum_cache;
900 if (nrbmblocks != sbp->sb_rbmblocks)
901 xfs_alloc_rsum_cache(mp, nrbmblocks);
904 * Allocate a new (fake) mount/sb.
906 nmp = kmem_alloc(sizeof(*nmp), 0);
908 * Loop over the bitmap blocks.
909 * We will do everything one bitmap block at a time.
910 * Skip the current block if it is exactly full.
911 * This also deals with the case where there were no rtextents before.
913 for (bmbno = sbp->sb_rbmblocks -
914 ((sbp->sb_rextents & ((1 << mp->m_blkbit_log) - 1)) != 0);
917 struct xfs_rtalloc_args args = {
920 struct xfs_rtalloc_args nargs = {
923 struct xfs_trans *tp;
924 xfs_rfsblock_t nrblocks_step;
929 * Calculate new sb and mount fields for this round.
931 nsbp->sb_rextsize = in->extsize;
932 nmp->m_rtxblklog = -1; /* don't use shift or masking */
933 nsbp->sb_rbmblocks = bmbno + 1;
934 nrblocks_step = (bmbno + 1) * NBBY * nsbp->sb_blocksize *
936 nsbp->sb_rblocks = min(nrblocks, nrblocks_step);
937 nsbp->sb_rextents = xfs_rtb_to_rtx(nmp, nsbp->sb_rblocks);
938 ASSERT(nsbp->sb_rextents != 0);
939 nsbp->sb_rextslog = xfs_compute_rextslog(nsbp->sb_rextents);
940 nrsumlevels = nmp->m_rsumlevels = nsbp->sb_rextslog + 1;
941 nrsumblocks = xfs_rtsummary_blockcount(mp, nrsumlevels,
943 nmp->m_rsumsize = nrsumsize = XFS_FSB_TO_B(mp, nrsumblocks);
944 /* recompute growfsrt reservation from new rsumsize */
945 xfs_trans_resv_calc(nmp, &nmp->m_resv);
948 * Start a transaction, get the log reservation.
950 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growrtfree, 0, 0, 0,
958 * Lock out other callers by grabbing the bitmap inode lock.
960 xfs_ilock(mp->m_rbmip, XFS_ILOCK_EXCL | XFS_ILOCK_RTBITMAP);
961 xfs_trans_ijoin(tp, mp->m_rbmip, XFS_ILOCK_EXCL);
963 * Update the bitmap inode's size ondisk and incore. We need
964 * to update the incore size so that inode inactivation won't
965 * punch what it thinks are "posteof" blocks.
967 mp->m_rbmip->i_disk_size =
968 nsbp->sb_rbmblocks * nsbp->sb_blocksize;
969 i_size_write(VFS_I(mp->m_rbmip), mp->m_rbmip->i_disk_size);
970 xfs_trans_log_inode(tp, mp->m_rbmip, XFS_ILOG_CORE);
972 * Get the summary inode into the transaction.
974 xfs_ilock(mp->m_rsumip, XFS_ILOCK_EXCL | XFS_ILOCK_RTSUM);
975 xfs_trans_ijoin(tp, mp->m_rsumip, XFS_ILOCK_EXCL);
977 * Update the summary inode's size. We need to update the
978 * incore size so that inode inactivation won't punch what it
979 * thinks are "posteof" blocks.
981 mp->m_rsumip->i_disk_size = nmp->m_rsumsize;
982 i_size_write(VFS_I(mp->m_rsumip), mp->m_rsumip->i_disk_size);
983 xfs_trans_log_inode(tp, mp->m_rsumip, XFS_ILOG_CORE);
985 * Copy summary data from old to new sizes.
986 * Do this when the real size (not block-aligned) changes.
988 if (sbp->sb_rbmblocks != nsbp->sb_rbmblocks ||
989 mp->m_rsumlevels != nmp->m_rsumlevels) {
990 error = xfs_rtcopy_summary(&args, &nargs);
995 * Update superblock fields.
997 if (nsbp->sb_rextsize != sbp->sb_rextsize)
998 xfs_trans_mod_sb(tp, XFS_TRANS_SB_REXTSIZE,
999 nsbp->sb_rextsize - sbp->sb_rextsize);
1000 if (nsbp->sb_rbmblocks != sbp->sb_rbmblocks)
1001 xfs_trans_mod_sb(tp, XFS_TRANS_SB_RBMBLOCKS,
1002 nsbp->sb_rbmblocks - sbp->sb_rbmblocks);
1003 if (nsbp->sb_rblocks != sbp->sb_rblocks)
1004 xfs_trans_mod_sb(tp, XFS_TRANS_SB_RBLOCKS,
1005 nsbp->sb_rblocks - sbp->sb_rblocks);
1006 if (nsbp->sb_rextents != sbp->sb_rextents)
1007 xfs_trans_mod_sb(tp, XFS_TRANS_SB_REXTENTS,
1008 nsbp->sb_rextents - sbp->sb_rextents);
1009 if (nsbp->sb_rextslog != sbp->sb_rextslog)
1010 xfs_trans_mod_sb(tp, XFS_TRANS_SB_REXTSLOG,
1011 nsbp->sb_rextslog - sbp->sb_rextslog);
1015 error = xfs_rtfree_range(&nargs, sbp->sb_rextents,
1016 nsbp->sb_rextents - sbp->sb_rextents);
1017 xfs_rtbuf_cache_relse(&nargs);
1020 xfs_trans_cancel(tp);
1024 * Mark more blocks free in the superblock.
1026 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FREXTENTS,
1027 nsbp->sb_rextents - sbp->sb_rextents);
1029 * Update mp values into the real mp structure.
1031 mp->m_rsumlevels = nrsumlevels;
1032 mp->m_rsumsize = nrsumsize;
1033 /* recompute growfsrt reservation from new rsumsize */
1034 xfs_trans_resv_calc(mp, &mp->m_resv);
1036 error = xfs_trans_commit(tp);
1040 /* Ensure the mount RT feature flag is now set. */
1041 mp->m_features |= XFS_FEAT_REALTIME;
1046 /* Update secondary superblocks now the physical grow has completed */
1047 error = xfs_update_secondary_sbs(mp);
1051 * Free the fake mp structure.
1056 * If we had to allocate a new rsum_cache, we either need to free the
1057 * old one (if we succeeded) or free the new one and restore the old one
1058 * (if there was an error).
1060 if (rsum_cache != mp->m_rsum_cache) {
1062 kmem_free(mp->m_rsum_cache);
1063 mp->m_rsum_cache = rsum_cache;
1065 kmem_free(rsum_cache);
1073 * Initialize realtime fields in the mount structure.
1077 struct xfs_mount *mp) /* file system mount structure */
1079 struct xfs_buf *bp; /* buffer for last block of subvolume */
1080 struct xfs_sb *sbp; /* filesystem superblock copy in mount */
1081 xfs_daddr_t d; /* address of last block of subvolume */
1082 unsigned int rsumblocks;
1086 if (sbp->sb_rblocks == 0)
1088 if (mp->m_rtdev_targp == NULL) {
1090 "Filesystem has a realtime volume, use rtdev=device option");
1093 mp->m_rsumlevels = sbp->sb_rextslog + 1;
1094 rsumblocks = xfs_rtsummary_blockcount(mp, mp->m_rsumlevels,
1095 mp->m_sb.sb_rbmblocks);
1096 mp->m_rsumsize = XFS_FSB_TO_B(mp, rsumblocks);
1097 mp->m_rbmip = mp->m_rsumip = NULL;
1099 * Check that the realtime section is an ok size.
1101 d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_rblocks);
1102 if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_rblocks) {
1103 xfs_warn(mp, "realtime mount -- %llu != %llu",
1104 (unsigned long long) XFS_BB_TO_FSB(mp, d),
1105 (unsigned long long) mp->m_sb.sb_rblocks);
1108 error = xfs_buf_read_uncached(mp->m_rtdev_targp,
1109 d - XFS_FSB_TO_BB(mp, 1),
1110 XFS_FSB_TO_BB(mp, 1), 0, &bp, NULL);
1112 xfs_warn(mp, "realtime device size check failed");
1120 xfs_rtalloc_count_frextent(
1121 struct xfs_mount *mp,
1122 struct xfs_trans *tp,
1123 const struct xfs_rtalloc_rec *rec,
1126 uint64_t *valp = priv;
1128 *valp += rec->ar_extcount;
1133 * Reinitialize the number of free realtime extents from the realtime bitmap.
1134 * Callers must ensure that there is no other activity in the filesystem.
1137 xfs_rtalloc_reinit_frextents(
1138 struct xfs_mount *mp)
1143 xfs_ilock(mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
1144 error = xfs_rtalloc_query_all(mp, NULL, xfs_rtalloc_count_frextent,
1146 xfs_iunlock(mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
1150 spin_lock(&mp->m_sb_lock);
1151 mp->m_sb.sb_frextents = val;
1152 spin_unlock(&mp->m_sb_lock);
1153 percpu_counter_set(&mp->m_frextents, mp->m_sb.sb_frextents);
1158 * Read in the bmbt of an rt metadata inode so that we never have to load them
1159 * at runtime. This enables the use of shared ILOCKs for rtbitmap scans. Use
1160 * an empty transaction to avoid deadlocking on loops in the bmbt.
1163 xfs_rtmount_iread_extents(
1164 struct xfs_inode *ip,
1165 unsigned int lock_class)
1167 struct xfs_trans *tp;
1170 error = xfs_trans_alloc_empty(ip->i_mount, &tp);
1174 xfs_ilock(ip, XFS_ILOCK_EXCL | lock_class);
1176 error = xfs_iread_extents(tp, ip, XFS_DATA_FORK);
1180 if (xfs_inode_has_attr_fork(ip)) {
1181 error = xfs_iread_extents(tp, ip, XFS_ATTR_FORK);
1187 xfs_iunlock(ip, XFS_ILOCK_EXCL | lock_class);
1188 xfs_trans_cancel(tp);
1193 * Get the bitmap and summary inodes and the summary cache into the mount
1194 * structure at mount time.
1198 xfs_mount_t *mp) /* file system mount structure */
1200 int error; /* error return value */
1204 error = xfs_iget(mp, NULL, sbp->sb_rbmino, 0, 0, &mp->m_rbmip);
1207 ASSERT(mp->m_rbmip != NULL);
1209 error = xfs_rtmount_iread_extents(mp->m_rbmip, XFS_ILOCK_RTBITMAP);
1211 goto out_rele_bitmap;
1213 error = xfs_iget(mp, NULL, sbp->sb_rsumino, 0, 0, &mp->m_rsumip);
1215 goto out_rele_bitmap;
1216 ASSERT(mp->m_rsumip != NULL);
1218 error = xfs_rtmount_iread_extents(mp->m_rsumip, XFS_ILOCK_RTSUM);
1220 goto out_rele_summary;
1222 xfs_alloc_rsum_cache(mp, sbp->sb_rbmblocks);
1226 xfs_irele(mp->m_rsumip);
1228 xfs_irele(mp->m_rbmip);
1233 xfs_rtunmount_inodes(
1234 struct xfs_mount *mp)
1236 kmem_free(mp->m_rsum_cache);
1238 xfs_irele(mp->m_rbmip);
1240 xfs_irele(mp->m_rsumip);
1244 * Pick an extent for allocation at the start of a new realtime file.
1245 * Use the sequence number stored in the atime field of the bitmap inode.
1246 * Translate this to a fraction of the rtextents, and return the product
1247 * of rtextents and the fraction.
1248 * The fraction sequence is 0, 1/2, 1/4, 3/4, 1/8, ..., 7/8, 1/16, ...
1252 xfs_mount_t *mp, /* file system mount point */
1253 xfs_trans_t *tp, /* transaction pointer */
1254 xfs_rtxlen_t len, /* allocation length (rtextents) */
1255 xfs_rtxnum_t *pick) /* result rt extent */
1257 xfs_rtxnum_t b; /* result rtext */
1258 int log2; /* log of sequence number */
1259 uint64_t resid; /* residual after log removed */
1260 uint64_t seq; /* sequence number of file creation */
1261 struct timespec64 ts; /* timespec in inode */
1263 ASSERT(xfs_isilocked(mp->m_rbmip, XFS_ILOCK_EXCL));
1265 ts = inode_get_atime(VFS_I(mp->m_rbmip));
1266 if (!(mp->m_rbmip->i_diflags & XFS_DIFLAG_NEWRTBM)) {
1267 mp->m_rbmip->i_diflags |= XFS_DIFLAG_NEWRTBM;
1272 if ((log2 = xfs_highbit64(seq)) == -1)
1275 resid = seq - (1ULL << log2);
1276 b = (mp->m_sb.sb_rextents * ((resid << 1) + 1ULL)) >>
1278 if (b >= mp->m_sb.sb_rextents)
1279 div64_u64_rem(b, mp->m_sb.sb_rextents, &b);
1280 if (b + len > mp->m_sb.sb_rextents)
1281 b = mp->m_sb.sb_rextents - len;
1283 ts.tv_sec = seq + 1;
1284 inode_set_atime_to_ts(VFS_I(mp->m_rbmip), ts);
1285 xfs_trans_log_inode(tp, mp->m_rbmip, XFS_ILOG_CORE);
1291 xfs_rtalloc_align_minmax(
1292 xfs_rtxlen_t *raminlen,
1293 xfs_rtxlen_t *ramaxlen,
1296 xfs_rtxlen_t newmaxlen = *ramaxlen;
1297 xfs_rtxlen_t newminlen = *raminlen;
1300 slack = newmaxlen % *prod;
1303 slack = newminlen % *prod;
1305 newminlen += *prod - slack;
1308 * If adjusting for extent size hint alignment produces an invalid
1309 * min/max len combination, go ahead without it.
1311 if (newmaxlen < newminlen) {
1315 *ramaxlen = newmaxlen;
1316 *raminlen = newminlen;
1321 struct xfs_bmalloca *ap)
1323 struct xfs_mount *mp = ap->ip->i_mount;
1324 xfs_fileoff_t orig_offset = ap->offset;
1325 xfs_rtxnum_t start; /* allocation hint rtextent no */
1326 xfs_rtxnum_t rtx; /* actually allocated rtextent no */
1327 xfs_rtxlen_t prod = 0; /* product factor for allocators */
1328 xfs_extlen_t mod = 0; /* product factor for allocators */
1329 xfs_rtxlen_t ralen = 0; /* realtime allocation length */
1330 xfs_extlen_t align; /* minimum allocation alignment */
1331 xfs_extlen_t orig_length = ap->length;
1332 xfs_extlen_t minlen = mp->m_sb.sb_rextsize;
1333 xfs_rtxlen_t raminlen;
1334 bool rtlocked = false;
1335 bool ignore_locality = false;
1336 struct xfs_rtalloc_args args = {
1342 align = xfs_get_extsz_hint(ap->ip);
1344 error = xfs_bmap_extsize_align(mp, &ap->got, &ap->prev,
1345 align, 1, ap->eof, 0,
1346 ap->conv, &ap->offset, &ap->length);
1350 ASSERT(xfs_extlen_to_rtxmod(mp, ap->length) == 0);
1353 * If we shifted the file offset downward to satisfy an extent size
1354 * hint, increase minlen by that amount so that the allocator won't
1355 * give us an allocation that's too short to cover at least one of the
1356 * blocks that the caller asked for.
1358 if (ap->offset != orig_offset)
1359 minlen += orig_offset - ap->offset;
1362 * Set ralen to be the actual requested length in rtextents.
1364 * If the old value was close enough to XFS_BMBT_MAX_EXTLEN that
1365 * we rounded up to it, cut it back so it's valid again.
1366 * Note that if it's a really large request (bigger than
1367 * XFS_BMBT_MAX_EXTLEN), we don't hear about that number, and can't
1368 * adjust the starting point to match it.
1370 ralen = xfs_extlen_to_rtxlen(mp, min(ap->length, XFS_MAX_BMBT_EXTLEN));
1371 raminlen = max_t(xfs_rtxlen_t, 1, xfs_extlen_to_rtxlen(mp, minlen));
1372 ASSERT(raminlen > 0);
1373 ASSERT(raminlen <= ralen);
1376 * Lock out modifications to both the RT bitmap and summary inodes
1379 xfs_ilock(mp->m_rbmip, XFS_ILOCK_EXCL|XFS_ILOCK_RTBITMAP);
1380 xfs_trans_ijoin(ap->tp, mp->m_rbmip, XFS_ILOCK_EXCL);
1381 xfs_ilock(mp->m_rsumip, XFS_ILOCK_EXCL|XFS_ILOCK_RTSUM);
1382 xfs_trans_ijoin(ap->tp, mp->m_rsumip, XFS_ILOCK_EXCL);
1386 if (ignore_locality) {
1388 } else if (xfs_bmap_adjacent(ap)) {
1389 start = xfs_rtb_to_rtx(mp, ap->blkno);
1390 } else if (ap->eof && ap->offset == 0) {
1392 * If it's an allocation to an empty file at offset 0, pick an
1393 * extent that will space things out in the rt area.
1395 error = xfs_rtpick_extent(mp, ap->tp, ralen, &start);
1403 * Only bother calculating a real prod factor if offset & length are
1404 * perfectly aligned, otherwise it will just get us in trouble.
1406 div_u64_rem(ap->offset, align, &mod);
1407 if (mod || ap->length % align) {
1410 prod = xfs_extlen_to_rtxlen(mp, align);
1412 xfs_rtalloc_align_minmax(&raminlen, &ralen, &prod);
1416 error = xfs_rtallocate_extent_near(&args, start, raminlen,
1417 ralen, &ralen, prod, &rtx);
1419 error = xfs_rtallocate_extent_size(&args, raminlen,
1420 ralen, &ralen, prod, &rtx);
1422 xfs_rtbuf_cache_relse(&args);
1424 if (error == -ENOSPC) {
1425 if (align > mp->m_sb.sb_rextsize) {
1427 * We previously enlarged the request length to try to
1428 * satisfy an extent size hint. The allocator didn't
1429 * return anything, so reset the parameters to the
1430 * original values and try again without alignment
1433 ap->offset = orig_offset;
1434 ap->length = orig_length;
1435 minlen = align = mp->m_sb.sb_rextsize;
1439 if (!ignore_locality && start != 0) {
1441 * If we can't allocate near a specific rt extent, try
1442 * again without locality criteria.
1444 ignore_locality = true;
1448 ap->blkno = NULLFSBLOCK;
1455 xfs_trans_mod_sb(ap->tp, ap->wasdel ?
1456 XFS_TRANS_SB_RES_FREXTENTS : XFS_TRANS_SB_FREXTENTS,
1458 ap->blkno = xfs_rtx_to_rtb(mp, rtx);
1459 ap->length = xfs_rtxlen_to_extlen(mp, ralen);
1460 xfs_bmap_alloc_account(ap);