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"
25 #include "xfs_log_priv.h"
26 #include "xfs_health.h"
29 * Return whether there are any free extents in the size range given
30 * by low and high, for the bitmap block bbno.
34 struct xfs_rtalloc_args *args,
35 int low, /* low log2 extent size */
36 int high, /* high log2 extent size */
37 xfs_fileoff_t bbno, /* bitmap block number */
38 int *maxlog) /* out: max log2 extent size free */
40 struct xfs_mount *mp = args->mp;
42 int log; /* loop counter, log2 of ext. size */
43 xfs_suminfo_t sum; /* summary data */
45 /* There are no extents at levels >= m_rsum_cache[bbno]. */
46 if (mp->m_rsum_cache) {
47 high = min(high, mp->m_rsum_cache[bbno] - 1);
55 * Loop over logs of extent sizes.
57 for (log = high; log >= low; log--) {
59 * Get one summary datum.
61 error = xfs_rtget_summary(args, log, bbno, &sum);
66 * If there are any, return success.
74 * Found nothing, return failure.
78 /* There were no extents at levels > log. */
79 if (mp->m_rsum_cache && log + 1 < mp->m_rsum_cache[bbno])
80 mp->m_rsum_cache[bbno] = log + 1;
86 * Copy and transform the summary file, given the old and new
87 * parameters in the mount structures.
91 struct xfs_rtalloc_args *oargs,
92 struct xfs_rtalloc_args *nargs)
94 xfs_fileoff_t bbno; /* bitmap block number */
96 int log; /* summary level number (log length) */
97 xfs_suminfo_t sum; /* summary data */
99 for (log = oargs->mp->m_rsumlevels - 1; log >= 0; log--) {
100 for (bbno = oargs->mp->m_sb.sb_rbmblocks - 1;
101 (xfs_srtblock_t)bbno >= 0;
103 error = xfs_rtget_summary(oargs, log, bbno, &sum);
108 error = xfs_rtmodify_summary(oargs, log, bbno, -sum);
111 error = xfs_rtmodify_summary(nargs, log, bbno, sum);
119 xfs_rtbuf_cache_relse(oargs);
123 * Mark an extent specified by start and len allocated.
124 * Updates all the summary information as well as the bitmap.
127 xfs_rtallocate_range(
128 struct xfs_rtalloc_args *args,
129 xfs_rtxnum_t start, /* start rtext to allocate */
130 xfs_rtxlen_t len) /* in/out: summary block number */
132 struct xfs_mount *mp = args->mp;
133 xfs_rtxnum_t end; /* end of the allocated rtext */
135 xfs_rtxnum_t postblock = 0; /* first rtext allocated > end */
136 xfs_rtxnum_t preblock = 0; /* first rtext allocated < start */
138 end = start + len - 1;
140 * Assume we're allocating out of the middle of a free extent.
141 * We need to find the beginning and end of the extent so we can
142 * properly update the summary.
144 error = xfs_rtfind_back(args, start, 0, &preblock);
149 * Find the next allocated block (end of free extent).
151 error = xfs_rtfind_forw(args, end, mp->m_sb.sb_rextents - 1,
157 * Decrement the summary information corresponding to the entire
160 error = xfs_rtmodify_summary(args,
161 xfs_highbit64(postblock + 1 - preblock),
162 xfs_rtx_to_rbmblock(mp, preblock), -1);
167 * If there are blocks not being allocated at the front of the
168 * old extent, add summary data for them to be free.
170 if (preblock < start) {
171 error = xfs_rtmodify_summary(args,
172 xfs_highbit64(start - preblock),
173 xfs_rtx_to_rbmblock(mp, preblock), 1);
179 * If there are blocks not being allocated at the end of the
180 * old extent, add summary data for them to be free.
182 if (postblock > end) {
183 error = xfs_rtmodify_summary(args,
184 xfs_highbit64(postblock - end),
185 xfs_rtx_to_rbmblock(mp, end + 1), 1);
191 * Modify the bitmap to mark this extent allocated.
193 return xfs_rtmodify_range(args, start, len, 0);
197 * Make sure we don't run off the end of the rt volume. Be careful that
198 * adjusting maxlen downwards doesn't cause us to fail the alignment checks.
200 static inline xfs_rtxlen_t
201 xfs_rtallocate_clamp_len(
202 struct xfs_mount *mp,
203 xfs_rtxnum_t startrtx,
209 ret = min(mp->m_sb.sb_rextents, startrtx + rtxlen) - startrtx;
210 return rounddown(ret, prod);
214 * Attempt to allocate an extent minlen<=len<=maxlen starting from
215 * bitmap block bbno. If we don't get maxlen then use prod to trim
216 * the length, if given. Returns error; returns starting block in *rtx.
217 * The lengths are all in rtextents.
220 xfs_rtallocate_extent_block(
221 struct xfs_rtalloc_args *args,
222 xfs_fileoff_t bbno, /* bitmap block number */
223 xfs_rtxlen_t minlen, /* minimum length to allocate */
224 xfs_rtxlen_t maxlen, /* maximum length to allocate */
225 xfs_rtxlen_t *len, /* out: actual length allocated */
226 xfs_rtxnum_t *nextp, /* out: next rtext to try */
227 xfs_rtxlen_t prod, /* extent product factor */
228 xfs_rtxnum_t *rtx) /* out: start rtext allocated */
230 struct xfs_mount *mp = args->mp;
231 xfs_rtxnum_t besti; /* best rtext found so far */
232 xfs_rtxnum_t bestlen;/* best length found so far */
233 xfs_rtxnum_t end; /* last rtext in chunk */
235 xfs_rtxnum_t i; /* current rtext trying */
236 xfs_rtxnum_t next; /* next rtext to try */
237 int stat; /* status from internal calls */
240 * Loop over all the extents starting in this bitmap block,
241 * looking for one that's long enough.
243 for (i = xfs_rbmblock_to_rtx(mp, bbno), besti = -1, bestlen = 0,
244 end = xfs_rbmblock_to_rtx(mp, bbno + 1) - 1;
247 /* Make sure we don't scan off the end of the rt volume. */
248 maxlen = xfs_rtallocate_clamp_len(mp, i, maxlen, prod);
251 * See if there's a free extent of maxlen starting at i.
252 * If it's not so then next will contain the first non-free.
254 error = xfs_rtcheck_range(args, i, maxlen, 1, &next, &stat);
259 * i for maxlen is all free, allocate and return that.
267 * In the case where we have a variable-sized allocation
268 * request, figure out how big this free piece is,
269 * and if it's big enough for the minimum, and the best
270 * so far, remember it.
272 if (minlen < maxlen) {
273 xfs_rtxnum_t thislen; /* this extent size */
276 if (thislen >= minlen && thislen > bestlen) {
282 * If not done yet, find the start of the next free space.
286 error = xfs_rtfind_forw(args, next, end, &i);
292 * Searched the whole thing & didn't find a maxlen free extent.
294 if (minlen > maxlen || besti == -1) {
296 * Allocation failed. Set *nextp to the next block to try.
303 * If size should be a multiple of prod, make that so.
306 xfs_rtxlen_t p; /* amount to trim length by */
308 div_u64_rem(bestlen, prod, &p);
314 * Allocate besti for bestlen & return that.
317 error = xfs_rtallocate_range(args, besti, bestlen);
326 * Allocate an extent of length minlen<=len<=maxlen, starting at block
327 * bno. If we don't get maxlen then use prod to trim the length, if given.
328 * Returns error; returns starting block in *rtx.
329 * The lengths are all in rtextents.
332 xfs_rtallocate_extent_exact(
333 struct xfs_rtalloc_args *args,
334 xfs_rtxnum_t start, /* starting rtext number to allocate */
335 xfs_rtxlen_t minlen, /* minimum length to allocate */
336 xfs_rtxlen_t maxlen, /* maximum length to allocate */
337 xfs_rtxlen_t *len, /* out: actual length allocated */
338 xfs_rtxlen_t prod, /* extent product factor */
339 xfs_rtxnum_t *rtx) /* out: start rtext allocated */
342 xfs_rtxlen_t i; /* extent length trimmed due to prod */
343 int isfree; /* extent is free */
344 xfs_rtxnum_t next; /* next rtext to try (dummy) */
346 ASSERT(minlen % prod == 0);
347 ASSERT(maxlen % prod == 0);
349 * Check if the range in question (for maxlen) is free.
351 error = xfs_rtcheck_range(args, start, maxlen, 1, &next, &isfree);
357 * If not, allocate what there is, if it's at least minlen.
359 maxlen = next - start;
364 * Trim off tail of extent, if prod is specified.
366 if (prod > 1 && (i = maxlen % prod)) {
374 * Allocate what we can and return it.
376 error = xfs_rtallocate_range(args, start, maxlen);
385 * Allocate an extent of length minlen<=len<=maxlen, starting as near
386 * to start as possible. If we don't get maxlen then use prod to trim
387 * the length, if given. The lengths are all in rtextents.
390 xfs_rtallocate_extent_near(
391 struct xfs_rtalloc_args *args,
392 xfs_rtxnum_t start, /* starting rtext number to allocate */
393 xfs_rtxlen_t minlen, /* minimum length to allocate */
394 xfs_rtxlen_t maxlen, /* maximum length to allocate */
395 xfs_rtxlen_t *len, /* out: actual length allocated */
396 xfs_rtxlen_t prod, /* extent product factor */
397 xfs_rtxnum_t *rtx) /* out: start rtext allocated */
399 struct xfs_mount *mp = args->mp;
400 int maxlog; /* max useful extent from summary */
401 xfs_fileoff_t bbno; /* bitmap block number */
403 int i; /* bitmap block offset (loop control) */
404 int j; /* secondary loop control */
405 int log2len; /* log2 of minlen */
406 xfs_rtxnum_t n; /* next rtext to try */
408 ASSERT(minlen % prod == 0);
409 ASSERT(maxlen % prod == 0);
412 * If the block number given is off the end, silently set it to
415 if (start >= mp->m_sb.sb_rextents)
416 start = mp->m_sb.sb_rextents - 1;
418 /* Make sure we don't run off the end of the rt volume. */
419 maxlen = xfs_rtallocate_clamp_len(mp, start, maxlen, prod);
424 * Try the exact allocation first.
426 error = xfs_rtallocate_extent_exact(args, start, minlen, maxlen, len,
428 if (error != -ENOSPC)
432 bbno = xfs_rtx_to_rbmblock(mp, start);
436 log2len = xfs_highbit32(minlen);
438 * Loop over all bitmap blocks (bbno + i is current block).
442 * Get summary information of extents of all useful levels
443 * starting in this bitmap block.
445 error = xfs_rtany_summary(args, log2len, mp->m_rsumlevels - 1,
451 * If there are any useful extents starting here, try
455 xfs_extlen_t maxavail =
456 min_t(xfs_rtblock_t, maxlen,
457 (1ULL << (maxlog + 1)) - 1);
459 * On the positive side of the starting location.
463 * Try to allocate an extent starting in
466 error = xfs_rtallocate_extent_block(args,
467 bbno + i, minlen, maxavail, len,
469 if (error != -ENOSPC)
473 * On the negative side of the starting location.
479 * Loop backwards to find the end of the extent
480 * we found in the realtime summary.
482 * maxblocks is the maximum possible number of
483 * bitmap blocks from the start of the extent
484 * to the end of the extent.
488 else if (maxlog < mp->m_blkbit_log)
491 maxblocks = 2 << (maxlog - mp->m_blkbit_log);
494 * We need to check bbno + i + maxblocks down to
495 * bbno + i. We already checked bbno down to
496 * bbno + j + 1, so we don't need to check those
499 j = min(i + maxblocks, j);
500 for (; j >= i; j--) {
501 error = xfs_rtallocate_extent_block(args,
503 maxavail, len, &n, prod,
505 if (error != -ENOSPC)
511 * Loop control. If we were on the positive side, and there's
512 * still more blocks on the negative side, go there.
514 if (i > 0 && (int)bbno - i >= 0)
517 * If positive, and no more negative, but there are more
518 * positive, go there.
520 else if (i > 0 && (int)bbno + i < mp->m_sb.sb_rbmblocks - 1)
523 * If negative or 0 (just started), and there are positive
524 * blocks to go, go there. The 0 case moves to block 1.
526 else if (i <= 0 && (int)bbno - i < mp->m_sb.sb_rbmblocks - 1)
529 * If negative or 0 and there are more negative blocks,
532 else if (i <= 0 && (int)bbno + i > 0)
535 * Must be done. Return failure.
544 xfs_rtalloc_sumlevel(
545 struct xfs_rtalloc_args *args,
546 int l, /* level number */
547 xfs_rtxlen_t minlen, /* minimum length to allocate */
548 xfs_rtxlen_t maxlen, /* maximum length to allocate */
549 xfs_rtxlen_t prod, /* extent product factor */
550 xfs_rtxlen_t *len, /* out: actual length allocated */
551 xfs_rtxnum_t *rtx) /* out: start rtext allocated */
553 xfs_fileoff_t i; /* bitmap block number */
555 for (i = 0; i < args->mp->m_sb.sb_rbmblocks; i++) {
556 xfs_suminfo_t sum; /* summary information for extents */
557 xfs_rtxnum_t n; /* next rtext to be tried */
560 error = xfs_rtget_summary(args, l, i, &sum);
565 * Nothing there, on to the next block.
571 * Try allocating the extent.
573 error = xfs_rtallocate_extent_block(args, i, minlen, maxlen,
575 if (error != -ENOSPC)
579 * If the "next block to try" returned from the allocator is
580 * beyond the next bitmap block, skip to that bitmap block.
582 if (xfs_rtx_to_rbmblock(args->mp, n) > i + 1)
583 i = xfs_rtx_to_rbmblock(args->mp, n) - 1;
590 * Allocate an extent of length minlen<=len<=maxlen, with no position
591 * specified. If we don't get maxlen then use prod to trim
592 * the length, if given. The lengths are all in rtextents.
595 xfs_rtallocate_extent_size(
596 struct xfs_rtalloc_args *args,
597 xfs_rtxlen_t minlen, /* minimum length to allocate */
598 xfs_rtxlen_t maxlen, /* maximum length to allocate */
599 xfs_rtxlen_t *len, /* out: actual length allocated */
600 xfs_rtxlen_t prod, /* extent product factor */
601 xfs_rtxnum_t *rtx) /* out: start rtext allocated */
604 int l; /* level number (loop control) */
606 ASSERT(minlen % prod == 0);
607 ASSERT(maxlen % prod == 0);
611 * Loop over all the levels starting with maxlen.
613 * At each level, look at all the bitmap blocks, to see if there are
614 * extents starting there that are long enough (>= maxlen).
616 * Note, only on the initial level can the allocation fail if the
617 * summary says there's an extent.
619 for (l = xfs_highbit32(maxlen); l < args->mp->m_rsumlevels; l++) {
620 error = xfs_rtalloc_sumlevel(args, l, minlen, maxlen, prod, len,
622 if (error != -ENOSPC)
627 * Didn't find any maxlen blocks. Try smaller ones, unless we are
628 * looking for a fixed size extent.
630 if (minlen > --maxlen)
636 * Loop over sizes, from maxlen down to minlen.
638 * This time, when we do the allocations, allow smaller ones to succeed,
639 * but make sure the specified minlen/maxlen are in the possible range
640 * for this summary level.
642 for (l = xfs_highbit32(maxlen); l >= xfs_highbit32(minlen); l--) {
643 error = xfs_rtalloc_sumlevel(args, l,
644 max_t(xfs_rtxlen_t, minlen, 1 << l),
645 min_t(xfs_rtxlen_t, maxlen, (1 << (l + 1)) - 1),
647 if (error != -ENOSPC)
655 * Allocate space to the bitmap or summary file, and zero it, for growfs.
659 struct xfs_mount *mp, /* file system mount point */
660 xfs_extlen_t oblocks, /* old count of blocks */
661 xfs_extlen_t nblocks, /* new count of blocks */
662 struct xfs_inode *ip) /* inode (bitmap/summary) */
664 xfs_fileoff_t bno; /* block number in file */
665 struct xfs_buf *bp; /* temporary buffer for zeroing */
666 xfs_daddr_t d; /* disk block address */
667 int error; /* error return value */
668 xfs_fsblock_t fsbno; /* filesystem block for bno */
669 struct xfs_bmbt_irec map; /* block map output */
670 int nmap; /* number of block maps */
671 int resblks; /* space reservation */
672 enum xfs_blft buf_type;
673 struct xfs_trans *tp;
675 if (ip == mp->m_rsumip)
676 buf_type = XFS_BLFT_RTSUMMARY_BUF;
678 buf_type = XFS_BLFT_RTBITMAP_BUF;
681 * Allocate space to the file, as necessary.
683 while (oblocks < nblocks) {
684 resblks = XFS_GROWFSRT_SPACE_RES(mp, nblocks - oblocks);
686 * Reserve space & log for one extent added to the file.
688 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growrtalloc, resblks,
695 xfs_ilock(ip, XFS_ILOCK_EXCL);
696 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
698 error = xfs_iext_count_may_overflow(ip, XFS_DATA_FORK,
699 XFS_IEXT_ADD_NOSPLIT_CNT);
701 error = xfs_iext_count_upgrade(tp, ip,
702 XFS_IEXT_ADD_NOSPLIT_CNT);
704 goto out_trans_cancel;
707 * Allocate blocks to the bitmap file.
710 error = xfs_bmapi_write(tp, ip, oblocks, nblocks - oblocks,
711 XFS_BMAPI_METADATA, 0, &map, &nmap);
712 if (!error && nmap < 1)
715 goto out_trans_cancel;
717 * Free any blocks freed up in the transaction, then commit.
719 error = xfs_trans_commit(tp);
723 * Now we need to clear the allocated blocks.
724 * Do this one block per transaction, to keep it simple.
726 for (bno = map.br_startoff, fsbno = map.br_startblock;
727 bno < map.br_startoff + map.br_blockcount;
730 * Reserve log for one block zeroing.
732 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growrtzero,
737 * Lock the bitmap inode.
739 xfs_ilock(ip, XFS_ILOCK_EXCL);
740 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
742 * Get a buffer for the block.
744 d = XFS_FSB_TO_DADDR(mp, fsbno);
745 error = xfs_trans_get_buf(tp, mp->m_ddev_targp, d,
746 mp->m_bsize, 0, &bp);
748 goto out_trans_cancel;
750 xfs_trans_buf_set_type(tp, bp, buf_type);
751 bp->b_ops = &xfs_rtbuf_ops;
752 memset(bp->b_addr, 0, mp->m_sb.sb_blocksize);
753 xfs_trans_log_buf(tp, bp, 0, mp->m_sb.sb_blocksize - 1);
755 * Commit the transaction.
757 error = xfs_trans_commit(tp);
762 * Go on to the next extent, if any.
764 oblocks = map.br_startoff + map.br_blockcount;
770 xfs_trans_cancel(tp);
775 xfs_alloc_rsum_cache(
776 xfs_mount_t *mp, /* file system mount structure */
777 xfs_extlen_t rbmblocks) /* number of rt bitmap blocks */
780 * The rsum cache is initialized to the maximum value, which is
781 * trivially an upper bound on the maximum level with any free extents.
782 * We can continue without the cache if it couldn't be allocated.
784 mp->m_rsum_cache = kvmalloc(rbmblocks, GFP_KERNEL);
785 if (mp->m_rsum_cache)
786 memset(mp->m_rsum_cache, -1, rbmblocks);
788 xfs_warn(mp, "could not allocate realtime summary cache");
792 * Visible (exported) functions.
796 * Grow the realtime area of the filesystem.
800 xfs_mount_t *mp, /* mount point for filesystem */
801 xfs_growfs_rt_t *in) /* growfs rt input struct */
803 xfs_fileoff_t bmbno; /* bitmap block number */
804 struct xfs_buf *bp; /* temporary buffer */
805 int error; /* error return value */
806 xfs_mount_t *nmp; /* new (fake) mount structure */
807 xfs_rfsblock_t nrblocks; /* new number of realtime blocks */
808 xfs_extlen_t nrbmblocks; /* new number of rt bitmap blocks */
809 xfs_rtxnum_t nrextents; /* new number of realtime extents */
810 uint8_t nrextslog; /* new log2 of sb_rextents */
811 xfs_extlen_t nrsumblocks; /* new number of summary blocks */
812 uint nrsumlevels; /* new rt summary levels */
813 uint nrsumsize; /* new size of rt summary, bytes */
814 xfs_sb_t *nsbp; /* new superblock */
815 xfs_extlen_t rbmblocks; /* current number of rt bitmap blocks */
816 xfs_extlen_t rsumblocks; /* current number of rt summary blks */
817 xfs_sb_t *sbp; /* old superblock */
818 uint8_t *rsum_cache; /* old summary cache */
822 if (!capable(CAP_SYS_ADMIN))
825 /* Needs to have been mounted with an rt device. */
826 if (!XFS_IS_REALTIME_MOUNT(mp))
829 * Mount should fail if the rt bitmap/summary files don't load, but
830 * we'll check anyway.
832 if (!mp->m_rbmip || !mp->m_rsumip)
835 /* Shrink not supported. */
836 if (in->newblocks <= sbp->sb_rblocks)
839 /* Can only change rt extent size when adding rt volume. */
840 if (sbp->sb_rblocks > 0 && in->extsize != sbp->sb_rextsize)
843 /* Range check the extent size. */
844 if (XFS_FSB_TO_B(mp, in->extsize) > XFS_MAX_RTEXTSIZE ||
845 XFS_FSB_TO_B(mp, in->extsize) < XFS_MIN_RTEXTSIZE)
848 /* Unsupported realtime features. */
849 if (xfs_has_rmapbt(mp) || xfs_has_reflink(mp) || xfs_has_quota(mp))
852 nrblocks = in->newblocks;
853 error = xfs_sb_validate_fsb_count(sbp, nrblocks);
857 * Read in the last block of the device, make sure it exists.
859 error = xfs_buf_read_uncached(mp->m_rtdev_targp,
860 XFS_FSB_TO_BB(mp, nrblocks - 1),
861 XFS_FSB_TO_BB(mp, 1), 0, &bp, NULL);
867 * Calculate new parameters. These are the final values to be reached.
869 nrextents = nrblocks;
870 do_div(nrextents, in->extsize);
871 if (!xfs_validate_rtextents(nrextents))
873 nrbmblocks = xfs_rtbitmap_blockcount(mp, nrextents);
874 nrextslog = xfs_compute_rextslog(nrextents);
875 nrsumlevels = nrextslog + 1;
876 nrsumblocks = xfs_rtsummary_blockcount(mp, nrsumlevels, nrbmblocks);
877 nrsumsize = XFS_FSB_TO_B(mp, nrsumblocks);
879 * New summary size can't be more than half the size of
880 * the log. This prevents us from getting a log overflow,
881 * since we'll log basically the whole summary file at once.
883 if (nrsumblocks > (mp->m_sb.sb_logblocks >> 1))
886 * Get the old block counts for bitmap and summary inodes.
887 * These can't change since other growfs callers are locked out.
889 rbmblocks = XFS_B_TO_FSB(mp, mp->m_rbmip->i_disk_size);
890 rsumblocks = XFS_B_TO_FSB(mp, mp->m_rsumip->i_disk_size);
892 * Allocate space to the bitmap and summary files, as necessary.
894 error = xfs_growfs_rt_alloc(mp, rbmblocks, nrbmblocks, mp->m_rbmip);
897 error = xfs_growfs_rt_alloc(mp, rsumblocks, nrsumblocks, mp->m_rsumip);
901 rsum_cache = mp->m_rsum_cache;
902 if (nrbmblocks != sbp->sb_rbmblocks)
903 xfs_alloc_rsum_cache(mp, nrbmblocks);
906 * Allocate a new (fake) mount/sb.
908 nmp = kmalloc(sizeof(*nmp), GFP_KERNEL | __GFP_NOFAIL);
910 * Loop over the bitmap blocks.
911 * We will do everything one bitmap block at a time.
912 * Skip the current block if it is exactly full.
913 * This also deals with the case where there were no rtextents before.
915 for (bmbno = sbp->sb_rbmblocks -
916 ((sbp->sb_rextents & ((1 << mp->m_blkbit_log) - 1)) != 0);
919 struct xfs_rtalloc_args args = {
922 struct xfs_rtalloc_args nargs = {
925 struct xfs_trans *tp;
926 xfs_rfsblock_t nrblocks_step;
931 * Calculate new sb and mount fields for this round.
933 nsbp->sb_rextsize = in->extsize;
934 nmp->m_rtxblklog = -1; /* don't use shift or masking */
935 nsbp->sb_rbmblocks = bmbno + 1;
936 nrblocks_step = (bmbno + 1) * NBBY * nsbp->sb_blocksize *
938 nsbp->sb_rblocks = min(nrblocks, nrblocks_step);
939 nsbp->sb_rextents = xfs_rtb_to_rtx(nmp, nsbp->sb_rblocks);
940 ASSERT(nsbp->sb_rextents != 0);
941 nsbp->sb_rextslog = xfs_compute_rextslog(nsbp->sb_rextents);
942 nrsumlevels = nmp->m_rsumlevels = nsbp->sb_rextslog + 1;
943 nrsumblocks = xfs_rtsummary_blockcount(mp, nrsumlevels,
945 nmp->m_rsumsize = nrsumsize = XFS_FSB_TO_B(mp, nrsumblocks);
946 /* recompute growfsrt reservation from new rsumsize */
947 xfs_trans_resv_calc(nmp, &nmp->m_resv);
950 * Start a transaction, get the log reservation.
952 error = xfs_trans_alloc(mp, &M_RES(mp)->tr_growrtfree, 0, 0, 0,
960 * Lock out other callers by grabbing the bitmap inode lock.
962 xfs_ilock(mp->m_rbmip, XFS_ILOCK_EXCL | XFS_ILOCK_RTBITMAP);
963 xfs_trans_ijoin(tp, mp->m_rbmip, XFS_ILOCK_EXCL);
965 * Update the bitmap inode's size ondisk and incore. We need
966 * to update the incore size so that inode inactivation won't
967 * punch what it thinks are "posteof" blocks.
969 mp->m_rbmip->i_disk_size =
970 nsbp->sb_rbmblocks * nsbp->sb_blocksize;
971 i_size_write(VFS_I(mp->m_rbmip), mp->m_rbmip->i_disk_size);
972 xfs_trans_log_inode(tp, mp->m_rbmip, XFS_ILOG_CORE);
974 * Get the summary inode into the transaction.
976 xfs_ilock(mp->m_rsumip, XFS_ILOCK_EXCL | XFS_ILOCK_RTSUM);
977 xfs_trans_ijoin(tp, mp->m_rsumip, XFS_ILOCK_EXCL);
979 * Update the summary inode's size. We need to update the
980 * incore size so that inode inactivation won't punch what it
981 * thinks are "posteof" blocks.
983 mp->m_rsumip->i_disk_size = nmp->m_rsumsize;
984 i_size_write(VFS_I(mp->m_rsumip), mp->m_rsumip->i_disk_size);
985 xfs_trans_log_inode(tp, mp->m_rsumip, XFS_ILOG_CORE);
987 * Copy summary data from old to new sizes.
988 * Do this when the real size (not block-aligned) changes.
990 if (sbp->sb_rbmblocks != nsbp->sb_rbmblocks ||
991 mp->m_rsumlevels != nmp->m_rsumlevels) {
992 error = xfs_rtcopy_summary(&args, &nargs);
997 * Update superblock fields.
999 if (nsbp->sb_rextsize != sbp->sb_rextsize)
1000 xfs_trans_mod_sb(tp, XFS_TRANS_SB_REXTSIZE,
1001 nsbp->sb_rextsize - sbp->sb_rextsize);
1002 if (nsbp->sb_rbmblocks != sbp->sb_rbmblocks)
1003 xfs_trans_mod_sb(tp, XFS_TRANS_SB_RBMBLOCKS,
1004 nsbp->sb_rbmblocks - sbp->sb_rbmblocks);
1005 if (nsbp->sb_rblocks != sbp->sb_rblocks)
1006 xfs_trans_mod_sb(tp, XFS_TRANS_SB_RBLOCKS,
1007 nsbp->sb_rblocks - sbp->sb_rblocks);
1008 if (nsbp->sb_rextents != sbp->sb_rextents)
1009 xfs_trans_mod_sb(tp, XFS_TRANS_SB_REXTENTS,
1010 nsbp->sb_rextents - sbp->sb_rextents);
1011 if (nsbp->sb_rextslog != sbp->sb_rextslog)
1012 xfs_trans_mod_sb(tp, XFS_TRANS_SB_REXTSLOG,
1013 nsbp->sb_rextslog - sbp->sb_rextslog);
1017 error = xfs_rtfree_range(&nargs, sbp->sb_rextents,
1018 nsbp->sb_rextents - sbp->sb_rextents);
1019 xfs_rtbuf_cache_relse(&nargs);
1022 xfs_trans_cancel(tp);
1026 * Mark more blocks free in the superblock.
1028 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FREXTENTS,
1029 nsbp->sb_rextents - sbp->sb_rextents);
1031 * Update mp values into the real mp structure.
1033 mp->m_rsumlevels = nrsumlevels;
1034 mp->m_rsumsize = nrsumsize;
1035 /* recompute growfsrt reservation from new rsumsize */
1036 xfs_trans_resv_calc(mp, &mp->m_resv);
1038 error = xfs_trans_commit(tp);
1042 /* Ensure the mount RT feature flag is now set. */
1043 mp->m_features |= XFS_FEAT_REALTIME;
1048 /* Update secondary superblocks now the physical grow has completed */
1049 error = xfs_update_secondary_sbs(mp);
1053 * Free the fake mp structure.
1058 * If we had to allocate a new rsum_cache, we either need to free the
1059 * old one (if we succeeded) or free the new one and restore the old one
1060 * (if there was an error).
1062 if (rsum_cache != mp->m_rsum_cache) {
1064 kvfree(mp->m_rsum_cache);
1065 mp->m_rsum_cache = rsum_cache;
1075 * Initialize realtime fields in the mount structure.
1079 struct xfs_mount *mp) /* file system mount structure */
1081 struct xfs_buf *bp; /* buffer for last block of subvolume */
1082 struct xfs_sb *sbp; /* filesystem superblock copy in mount */
1083 xfs_daddr_t d; /* address of last block of subvolume */
1084 unsigned int rsumblocks;
1088 if (sbp->sb_rblocks == 0)
1090 if (mp->m_rtdev_targp == NULL) {
1092 "Filesystem has a realtime volume, use rtdev=device option");
1095 mp->m_rsumlevels = sbp->sb_rextslog + 1;
1096 rsumblocks = xfs_rtsummary_blockcount(mp, mp->m_rsumlevels,
1097 mp->m_sb.sb_rbmblocks);
1098 mp->m_rsumsize = XFS_FSB_TO_B(mp, rsumblocks);
1099 mp->m_rbmip = mp->m_rsumip = NULL;
1101 * Check that the realtime section is an ok size.
1103 d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_rblocks);
1104 if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_rblocks) {
1105 xfs_warn(mp, "realtime mount -- %llu != %llu",
1106 (unsigned long long) XFS_BB_TO_FSB(mp, d),
1107 (unsigned long long) mp->m_sb.sb_rblocks);
1110 error = xfs_buf_read_uncached(mp->m_rtdev_targp,
1111 d - XFS_FSB_TO_BB(mp, 1),
1112 XFS_FSB_TO_BB(mp, 1), 0, &bp, NULL);
1114 xfs_warn(mp, "realtime device size check failed");
1122 xfs_rtalloc_count_frextent(
1123 struct xfs_mount *mp,
1124 struct xfs_trans *tp,
1125 const struct xfs_rtalloc_rec *rec,
1128 uint64_t *valp = priv;
1130 *valp += rec->ar_extcount;
1135 * Reinitialize the number of free realtime extents from the realtime bitmap.
1136 * Callers must ensure that there is no other activity in the filesystem.
1139 xfs_rtalloc_reinit_frextents(
1140 struct xfs_mount *mp)
1145 xfs_ilock(mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
1146 error = xfs_rtalloc_query_all(mp, NULL, xfs_rtalloc_count_frextent,
1148 xfs_iunlock(mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
1152 spin_lock(&mp->m_sb_lock);
1153 mp->m_sb.sb_frextents = val;
1154 spin_unlock(&mp->m_sb_lock);
1155 percpu_counter_set(&mp->m_frextents, mp->m_sb.sb_frextents);
1160 * Read in the bmbt of an rt metadata inode so that we never have to load them
1161 * at runtime. This enables the use of shared ILOCKs for rtbitmap scans. Use
1162 * an empty transaction to avoid deadlocking on loops in the bmbt.
1165 xfs_rtmount_iread_extents(
1166 struct xfs_inode *ip,
1167 unsigned int lock_class)
1169 struct xfs_trans *tp;
1172 error = xfs_trans_alloc_empty(ip->i_mount, &tp);
1176 xfs_ilock(ip, XFS_ILOCK_EXCL | lock_class);
1178 error = xfs_iread_extents(tp, ip, XFS_DATA_FORK);
1182 if (xfs_inode_has_attr_fork(ip)) {
1183 error = xfs_iread_extents(tp, ip, XFS_ATTR_FORK);
1189 xfs_iunlock(ip, XFS_ILOCK_EXCL | lock_class);
1190 xfs_trans_cancel(tp);
1195 * Get the bitmap and summary inodes and the summary cache into the mount
1196 * structure at mount time.
1200 xfs_mount_t *mp) /* file system mount structure */
1202 int error; /* error return value */
1206 error = xfs_iget(mp, NULL, sbp->sb_rbmino, 0, 0, &mp->m_rbmip);
1207 if (xfs_metadata_is_sick(error))
1208 xfs_rt_mark_sick(mp, XFS_SICK_RT_BITMAP);
1211 ASSERT(mp->m_rbmip != NULL);
1213 error = xfs_rtmount_iread_extents(mp->m_rbmip, XFS_ILOCK_RTBITMAP);
1215 goto out_rele_bitmap;
1217 error = xfs_iget(mp, NULL, sbp->sb_rsumino, 0, 0, &mp->m_rsumip);
1218 if (xfs_metadata_is_sick(error))
1219 xfs_rt_mark_sick(mp, XFS_SICK_RT_SUMMARY);
1221 goto out_rele_bitmap;
1222 ASSERT(mp->m_rsumip != NULL);
1224 error = xfs_rtmount_iread_extents(mp->m_rsumip, XFS_ILOCK_RTSUM);
1226 goto out_rele_summary;
1228 xfs_alloc_rsum_cache(mp, sbp->sb_rbmblocks);
1232 xfs_irele(mp->m_rsumip);
1234 xfs_irele(mp->m_rbmip);
1239 xfs_rtunmount_inodes(
1240 struct xfs_mount *mp)
1242 kvfree(mp->m_rsum_cache);
1244 xfs_irele(mp->m_rbmip);
1246 xfs_irele(mp->m_rsumip);
1250 * Pick an extent for allocation at the start of a new realtime file.
1251 * Use the sequence number stored in the atime field of the bitmap inode.
1252 * Translate this to a fraction of the rtextents, and return the product
1253 * of rtextents and the fraction.
1254 * The fraction sequence is 0, 1/2, 1/4, 3/4, 1/8, ..., 7/8, 1/16, ...
1258 xfs_mount_t *mp, /* file system mount point */
1259 xfs_trans_t *tp, /* transaction pointer */
1260 xfs_rtxlen_t len, /* allocation length (rtextents) */
1261 xfs_rtxnum_t *pick) /* result rt extent */
1263 xfs_rtxnum_t b; /* result rtext */
1264 int log2; /* log of sequence number */
1265 uint64_t resid; /* residual after log removed */
1266 uint64_t seq; /* sequence number of file creation */
1267 struct timespec64 ts; /* timespec in inode */
1269 xfs_assert_ilocked(mp->m_rbmip, XFS_ILOCK_EXCL);
1271 ts = inode_get_atime(VFS_I(mp->m_rbmip));
1272 if (!(mp->m_rbmip->i_diflags & XFS_DIFLAG_NEWRTBM)) {
1273 mp->m_rbmip->i_diflags |= XFS_DIFLAG_NEWRTBM;
1278 if ((log2 = xfs_highbit64(seq)) == -1)
1281 resid = seq - (1ULL << log2);
1282 b = (mp->m_sb.sb_rextents * ((resid << 1) + 1ULL)) >>
1284 if (b >= mp->m_sb.sb_rextents)
1285 div64_u64_rem(b, mp->m_sb.sb_rextents, &b);
1286 if (b + len > mp->m_sb.sb_rextents)
1287 b = mp->m_sb.sb_rextents - len;
1289 ts.tv_sec = seq + 1;
1290 inode_set_atime_to_ts(VFS_I(mp->m_rbmip), ts);
1291 xfs_trans_log_inode(tp, mp->m_rbmip, XFS_ILOG_CORE);
1297 xfs_rtalloc_align_minmax(
1298 xfs_rtxlen_t *raminlen,
1299 xfs_rtxlen_t *ramaxlen,
1302 xfs_rtxlen_t newmaxlen = *ramaxlen;
1303 xfs_rtxlen_t newminlen = *raminlen;
1306 slack = newmaxlen % *prod;
1309 slack = newminlen % *prod;
1311 newminlen += *prod - slack;
1314 * If adjusting for extent size hint alignment produces an invalid
1315 * min/max len combination, go ahead without it.
1317 if (newmaxlen < newminlen) {
1321 *ramaxlen = newmaxlen;
1322 *raminlen = newminlen;
1327 struct xfs_bmalloca *ap)
1329 struct xfs_mount *mp = ap->ip->i_mount;
1330 xfs_fileoff_t orig_offset = ap->offset;
1331 xfs_rtxnum_t start; /* allocation hint rtextent no */
1332 xfs_rtxnum_t rtx; /* actually allocated rtextent no */
1333 xfs_rtxlen_t prod = 0; /* product factor for allocators */
1334 xfs_extlen_t mod = 0; /* product factor for allocators */
1335 xfs_rtxlen_t ralen = 0; /* realtime allocation length */
1336 xfs_extlen_t align; /* minimum allocation alignment */
1337 xfs_extlen_t orig_length = ap->length;
1338 xfs_extlen_t minlen = mp->m_sb.sb_rextsize;
1339 xfs_rtxlen_t raminlen;
1340 bool rtlocked = false;
1341 bool ignore_locality = false;
1342 struct xfs_rtalloc_args args = {
1348 align = xfs_get_extsz_hint(ap->ip);
1350 error = xfs_bmap_extsize_align(mp, &ap->got, &ap->prev,
1351 align, 1, ap->eof, 0,
1352 ap->conv, &ap->offset, &ap->length);
1356 ASSERT(xfs_extlen_to_rtxmod(mp, ap->length) == 0);
1359 * If we shifted the file offset downward to satisfy an extent size
1360 * hint, increase minlen by that amount so that the allocator won't
1361 * give us an allocation that's too short to cover at least one of the
1362 * blocks that the caller asked for.
1364 if (ap->offset != orig_offset)
1365 minlen += orig_offset - ap->offset;
1368 * Set ralen to be the actual requested length in rtextents.
1370 * If the old value was close enough to XFS_BMBT_MAX_EXTLEN that
1371 * we rounded up to it, cut it back so it's valid again.
1372 * Note that if it's a really large request (bigger than
1373 * XFS_BMBT_MAX_EXTLEN), we don't hear about that number, and can't
1374 * adjust the starting point to match it.
1376 ralen = xfs_extlen_to_rtxlen(mp, min(ap->length, XFS_MAX_BMBT_EXTLEN));
1377 raminlen = max_t(xfs_rtxlen_t, 1, xfs_extlen_to_rtxlen(mp, minlen));
1378 ASSERT(raminlen > 0);
1379 ASSERT(raminlen <= ralen);
1382 * Lock out modifications to both the RT bitmap and summary inodes
1385 xfs_ilock(mp->m_rbmip, XFS_ILOCK_EXCL|XFS_ILOCK_RTBITMAP);
1386 xfs_trans_ijoin(ap->tp, mp->m_rbmip, XFS_ILOCK_EXCL);
1387 xfs_ilock(mp->m_rsumip, XFS_ILOCK_EXCL|XFS_ILOCK_RTSUM);
1388 xfs_trans_ijoin(ap->tp, mp->m_rsumip, XFS_ILOCK_EXCL);
1392 if (ignore_locality) {
1394 } else if (xfs_bmap_adjacent(ap)) {
1395 start = xfs_rtb_to_rtx(mp, ap->blkno);
1396 } else if (ap->eof && ap->offset == 0) {
1398 * If it's an allocation to an empty file at offset 0, pick an
1399 * extent that will space things out in the rt area.
1401 error = xfs_rtpick_extent(mp, ap->tp, ralen, &start);
1409 * Only bother calculating a real prod factor if offset & length are
1410 * perfectly aligned, otherwise it will just get us in trouble.
1412 div_u64_rem(ap->offset, align, &mod);
1413 if (mod || ap->length % align) {
1416 prod = xfs_extlen_to_rtxlen(mp, align);
1418 xfs_rtalloc_align_minmax(&raminlen, &ralen, &prod);
1422 error = xfs_rtallocate_extent_near(&args, start, raminlen,
1423 ralen, &ralen, prod, &rtx);
1425 error = xfs_rtallocate_extent_size(&args, raminlen,
1426 ralen, &ralen, prod, &rtx);
1428 xfs_rtbuf_cache_relse(&args);
1430 if (error == -ENOSPC) {
1431 if (align > mp->m_sb.sb_rextsize) {
1433 * We previously enlarged the request length to try to
1434 * satisfy an extent size hint. The allocator didn't
1435 * return anything, so reset the parameters to the
1436 * original values and try again without alignment
1439 ap->offset = orig_offset;
1440 ap->length = orig_length;
1441 minlen = align = mp->m_sb.sb_rextsize;
1445 if (!ignore_locality && start != 0) {
1447 * If we can't allocate near a specific rt extent, try
1448 * again without locality criteria.
1450 ignore_locality = true;
1454 ap->blkno = NULLFSBLOCK;
1461 xfs_trans_mod_sb(ap->tp, ap->wasdel ?
1462 XFS_TRANS_SB_RES_FREXTENTS : XFS_TRANS_SB_FREXTENTS,
1464 ap->blkno = xfs_rtx_to_rtb(mp, rtx);
1465 ap->length = xfs_rtxlen_to_extlen(mp, ralen);
1466 xfs_bmap_alloc_account(ap);