2 * Copyright (c) 2000-2005 Silicon Graphics, Inc.
5 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
7 * published by the Free Software Foundation.
9 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
20 #include "xfs_shared.h"
21 #include "xfs_format.h"
22 #include "xfs_log_format.h"
23 #include "xfs_trans_resv.h"
27 #include "xfs_mount.h"
28 #include "xfs_inode.h"
30 #include "xfs_bmap_util.h"
31 #include "xfs_bmap_btree.h"
32 #include "xfs_alloc.h"
33 #include "xfs_error.h"
34 #include "xfs_trans.h"
35 #include "xfs_trans_space.h"
36 #include "xfs_trace.h"
38 #include "xfs_icache.h"
39 #include "xfs_dinode.h"
40 #include "xfs_rtalloc.h"
44 * Read and return the summary information for a given extent size,
45 * bitmap block combination.
46 * Keeps track of a current summary block, so we don't keep reading
47 * it from the buffer cache.
51 xfs_mount_t *mp, /* file system mount structure */
52 xfs_trans_t *tp, /* transaction pointer */
53 int log, /* log2 of extent size */
54 xfs_rtblock_t bbno, /* bitmap block number */
55 xfs_buf_t **rbpp, /* in/out: summary block buffer */
56 xfs_fsblock_t *rsb, /* in/out: summary block number */
57 xfs_suminfo_t *sum) /* out: summary info for this block */
59 return xfs_rtmodify_summary_int(mp, tp, log, bbno, 0, rbpp, rsb, sum);
63 * Return whether there are any free extents in the size range given
64 * by low and high, for the bitmap block bbno.
66 STATIC int /* error */
68 xfs_mount_t *mp, /* file system mount structure */
69 xfs_trans_t *tp, /* transaction pointer */
70 int low, /* low log2 extent size */
71 int high, /* high log2 extent size */
72 xfs_rtblock_t bbno, /* bitmap block number */
73 xfs_buf_t **rbpp, /* in/out: summary block buffer */
74 xfs_fsblock_t *rsb, /* in/out: summary block number */
75 int *stat) /* out: any good extents here? */
77 int error; /* error value */
78 int log; /* loop counter, log2 of ext. size */
79 xfs_suminfo_t sum; /* summary data */
82 * Loop over logs of extent sizes. Order is irrelevant.
84 for (log = low; log <= high; log++) {
86 * Get one summary datum.
88 error = xfs_rtget_summary(mp, tp, log, bbno, rbpp, rsb, &sum);
93 * If there are any, return success.
101 * Found nothing, return failure.
109 * Copy and transform the summary file, given the old and new
110 * parameters in the mount structures.
112 STATIC int /* error */
114 xfs_mount_t *omp, /* old file system mount point */
115 xfs_mount_t *nmp, /* new file system mount point */
116 xfs_trans_t *tp) /* transaction pointer */
118 xfs_rtblock_t bbno; /* bitmap block number */
119 xfs_buf_t *bp; /* summary buffer */
120 int error; /* error return value */
121 int log; /* summary level number (log length) */
122 xfs_suminfo_t sum; /* summary data */
123 xfs_fsblock_t sumbno; /* summary block number */
126 for (log = omp->m_rsumlevels - 1; log >= 0; log--) {
127 for (bbno = omp->m_sb.sb_rbmblocks - 1;
128 (xfs_srtblock_t)bbno >= 0;
130 error = xfs_rtget_summary(omp, tp, log, bbno, &bp,
136 error = xfs_rtmodify_summary(omp, tp, log, bbno, -sum,
140 error = xfs_rtmodify_summary(nmp, tp, log, bbno, sum,
150 * Mark an extent specified by start and len allocated.
151 * Updates all the summary information as well as the bitmap.
153 STATIC int /* error */
154 xfs_rtallocate_range(
155 xfs_mount_t *mp, /* file system mount point */
156 xfs_trans_t *tp, /* transaction pointer */
157 xfs_rtblock_t start, /* start block to allocate */
158 xfs_extlen_t len, /* length to allocate */
159 xfs_buf_t **rbpp, /* in/out: summary block buffer */
160 xfs_fsblock_t *rsb) /* in/out: summary block number */
162 xfs_rtblock_t end; /* end of the allocated extent */
163 int error; /* error value */
164 xfs_rtblock_t postblock = 0; /* first block allocated > end */
165 xfs_rtblock_t preblock = 0; /* first block allocated < start */
167 end = start + len - 1;
169 * Assume we're allocating out of the middle of a free extent.
170 * We need to find the beginning and end of the extent so we can
171 * properly update the summary.
173 error = xfs_rtfind_back(mp, tp, start, 0, &preblock);
178 * Find the next allocated block (end of free extent).
180 error = xfs_rtfind_forw(mp, tp, end, mp->m_sb.sb_rextents - 1,
186 * Decrement the summary information corresponding to the entire
189 error = xfs_rtmodify_summary(mp, tp,
190 XFS_RTBLOCKLOG(postblock + 1 - preblock),
191 XFS_BITTOBLOCK(mp, preblock), -1, rbpp, rsb);
196 * If there are blocks not being allocated at the front of the
197 * old extent, add summary data for them to be free.
199 if (preblock < start) {
200 error = xfs_rtmodify_summary(mp, tp,
201 XFS_RTBLOCKLOG(start - preblock),
202 XFS_BITTOBLOCK(mp, preblock), 1, rbpp, rsb);
208 * If there are blocks not being allocated at the end of the
209 * old extent, add summary data for them to be free.
211 if (postblock > end) {
212 error = xfs_rtmodify_summary(mp, tp,
213 XFS_RTBLOCKLOG(postblock - end),
214 XFS_BITTOBLOCK(mp, end + 1), 1, rbpp, rsb);
220 * Modify the bitmap to mark this extent allocated.
222 error = xfs_rtmodify_range(mp, tp, start, len, 0);
227 * Attempt to allocate an extent minlen<=len<=maxlen starting from
228 * bitmap block bbno. If we don't get maxlen then use prod to trim
229 * the length, if given. Returns error; returns starting block in *rtblock.
230 * The lengths are all in rtextents.
232 STATIC int /* error */
233 xfs_rtallocate_extent_block(
234 xfs_mount_t *mp, /* file system mount point */
235 xfs_trans_t *tp, /* transaction pointer */
236 xfs_rtblock_t bbno, /* bitmap block number */
237 xfs_extlen_t minlen, /* minimum length to allocate */
238 xfs_extlen_t maxlen, /* maximum length to allocate */
239 xfs_extlen_t *len, /* out: actual length allocated */
240 xfs_rtblock_t *nextp, /* out: next block to try */
241 xfs_buf_t **rbpp, /* in/out: summary block buffer */
242 xfs_fsblock_t *rsb, /* in/out: summary block number */
243 xfs_extlen_t prod, /* extent product factor */
244 xfs_rtblock_t *rtblock) /* out: start block allocated */
246 xfs_rtblock_t besti; /* best rtblock found so far */
247 xfs_rtblock_t bestlen; /* best length found so far */
248 xfs_rtblock_t end; /* last rtblock in chunk */
249 int error; /* error value */
250 xfs_rtblock_t i; /* current rtblock trying */
251 xfs_rtblock_t next; /* next rtblock to try */
252 int stat; /* status from internal calls */
255 * Loop over all the extents starting in this bitmap block,
256 * looking for one that's long enough.
258 for (i = XFS_BLOCKTOBIT(mp, bbno), besti = -1, bestlen = 0,
259 end = XFS_BLOCKTOBIT(mp, bbno + 1) - 1;
263 * See if there's a free extent of maxlen starting at i.
264 * If it's not so then next will contain the first non-free.
266 error = xfs_rtcheck_range(mp, tp, i, maxlen, 1, &next, &stat);
272 * i for maxlen is all free, allocate and return that.
274 error = xfs_rtallocate_range(mp, tp, i, maxlen, rbpp,
284 * In the case where we have a variable-sized allocation
285 * request, figure out how big this free piece is,
286 * and if it's big enough for the minimum, and the best
287 * so far, remember it.
289 if (minlen < maxlen) {
290 xfs_rtblock_t thislen; /* this extent size */
293 if (thislen >= minlen && thislen > bestlen) {
299 * If not done yet, find the start of the next free space.
302 error = xfs_rtfind_forw(mp, tp, next, end, &i);
310 * Searched the whole thing & didn't find a maxlen free extent.
312 if (minlen < maxlen && besti != -1) {
313 xfs_extlen_t p; /* amount to trim length by */
316 * If size should be a multiple of prod, make that so.
318 if (prod > 1 && (p = do_mod(bestlen, prod)))
321 * Allocate besti for bestlen & return that.
323 error = xfs_rtallocate_range(mp, tp, besti, bestlen, rbpp, rsb);
332 * Allocation failed. Set *nextp to the next block to try.
335 *rtblock = NULLRTBLOCK;
340 * Allocate an extent of length minlen<=len<=maxlen, starting at block
341 * bno. If we don't get maxlen then use prod to trim the length, if given.
342 * Returns error; returns starting block in *rtblock.
343 * The lengths are all in rtextents.
345 STATIC int /* error */
346 xfs_rtallocate_extent_exact(
347 xfs_mount_t *mp, /* file system mount point */
348 xfs_trans_t *tp, /* transaction pointer */
349 xfs_rtblock_t bno, /* starting block number to allocate */
350 xfs_extlen_t minlen, /* minimum length to allocate */
351 xfs_extlen_t maxlen, /* maximum length to allocate */
352 xfs_extlen_t *len, /* out: actual length allocated */
353 xfs_buf_t **rbpp, /* in/out: summary block buffer */
354 xfs_fsblock_t *rsb, /* in/out: summary block number */
355 xfs_extlen_t prod, /* extent product factor */
356 xfs_rtblock_t *rtblock) /* out: start block allocated */
358 int error; /* error value */
359 xfs_extlen_t i; /* extent length trimmed due to prod */
360 int isfree; /* extent is free */
361 xfs_rtblock_t next; /* next block to try (dummy) */
363 ASSERT(minlen % prod == 0 && maxlen % prod == 0);
365 * Check if the range in question (for maxlen) is free.
367 error = xfs_rtcheck_range(mp, tp, bno, maxlen, 1, &next, &isfree);
373 * If it is, allocate it and return success.
375 error = xfs_rtallocate_range(mp, tp, bno, maxlen, rbpp, rsb);
384 * If not, allocate what there is, if it's at least minlen.
387 if (maxlen < minlen) {
389 * Failed, return failure status.
391 *rtblock = NULLRTBLOCK;
395 * Trim off tail of extent, if prod is specified.
397 if (prod > 1 && (i = maxlen % prod)) {
399 if (maxlen < minlen) {
401 * Now we can't do it, return failure status.
403 *rtblock = NULLRTBLOCK;
408 * Allocate what we can and return it.
410 error = xfs_rtallocate_range(mp, tp, bno, maxlen, rbpp, rsb);
420 * Allocate an extent of length minlen<=len<=maxlen, starting as near
421 * to bno as possible. If we don't get maxlen then use prod to trim
422 * the length, if given. The lengths are all in rtextents.
424 STATIC int /* error */
425 xfs_rtallocate_extent_near(
426 xfs_mount_t *mp, /* file system mount point */
427 xfs_trans_t *tp, /* transaction pointer */
428 xfs_rtblock_t bno, /* starting block number to allocate */
429 xfs_extlen_t minlen, /* minimum length to allocate */
430 xfs_extlen_t maxlen, /* maximum length to allocate */
431 xfs_extlen_t *len, /* out: actual length allocated */
432 xfs_buf_t **rbpp, /* in/out: summary block buffer */
433 xfs_fsblock_t *rsb, /* in/out: summary block number */
434 xfs_extlen_t prod, /* extent product factor */
435 xfs_rtblock_t *rtblock) /* out: start block allocated */
437 int any; /* any useful extents from summary */
438 xfs_rtblock_t bbno; /* bitmap block number */
439 int error; /* error value */
440 int i; /* bitmap block offset (loop control) */
441 int j; /* secondary loop control */
442 int log2len; /* log2 of minlen */
443 xfs_rtblock_t n; /* next block to try */
444 xfs_rtblock_t r; /* result block */
446 ASSERT(minlen % prod == 0 && maxlen % prod == 0);
448 * If the block number given is off the end, silently set it to
451 if (bno >= mp->m_sb.sb_rextents)
452 bno = mp->m_sb.sb_rextents - 1;
454 * Try the exact allocation first.
456 error = xfs_rtallocate_extent_exact(mp, tp, bno, minlen, maxlen, len,
457 rbpp, rsb, prod, &r);
462 * If the exact allocation worked, return that.
464 if (r != NULLRTBLOCK) {
468 bbno = XFS_BITTOBLOCK(mp, bno);
471 log2len = xfs_highbit32(minlen);
473 * Loop over all bitmap blocks (bbno + i is current block).
477 * Get summary information of extents of all useful levels
478 * starting in this bitmap block.
480 error = xfs_rtany_summary(mp, tp, log2len, mp->m_rsumlevels - 1,
481 bbno + i, rbpp, rsb, &any);
486 * If there are any useful extents starting here, try
491 * On the positive side of the starting location.
495 * Try to allocate an extent starting in
498 error = xfs_rtallocate_extent_block(mp, tp,
499 bbno + i, minlen, maxlen, len, &n, rbpp,
505 * If it worked, return it.
507 if (r != NULLRTBLOCK) {
513 * On the negative side of the starting location.
517 * Loop backwards through the bitmap blocks from
518 * the starting point-1 up to where we are now.
519 * There should be an extent which ends in this
520 * bitmap block and is long enough.
522 for (j = -1; j > i; j--) {
524 * Grab the summary information for
527 error = xfs_rtany_summary(mp, tp,
528 log2len, mp->m_rsumlevels - 1,
529 bbno + j, rbpp, rsb, &any);
534 * If there's no extent given in the
535 * summary that means the extent we
536 * found must carry over from an
537 * earlier block. If there is an
538 * extent given, we've already tried
539 * that allocation, don't do it again.
543 error = xfs_rtallocate_extent_block(mp,
544 tp, bbno + j, minlen, maxlen,
545 len, &n, rbpp, rsb, prod, &r);
550 * If it works, return the extent.
552 if (r != NULLRTBLOCK) {
558 * There weren't intervening bitmap blocks
559 * with a long enough extent, or the
560 * allocation didn't work for some reason
561 * (i.e. it's a little * too short).
562 * Try to allocate from the summary block
565 error = xfs_rtallocate_extent_block(mp, tp,
566 bbno + i, minlen, maxlen, len, &n, rbpp,
572 * If it works, return the extent.
574 if (r != NULLRTBLOCK) {
581 * Loop control. If we were on the positive side, and there's
582 * still more blocks on the negative side, go there.
584 if (i > 0 && (int)bbno - i >= 0)
587 * If positive, and no more negative, but there are more
588 * positive, go there.
590 else if (i > 0 && (int)bbno + i < mp->m_sb.sb_rbmblocks - 1)
593 * If negative or 0 (just started), and there are positive
594 * blocks to go, go there. The 0 case moves to block 1.
596 else if (i <= 0 && (int)bbno - i < mp->m_sb.sb_rbmblocks - 1)
599 * If negative or 0 and there are more negative blocks,
602 else if (i <= 0 && (int)bbno + i > 0)
605 * Must be done. Return failure.
610 *rtblock = NULLRTBLOCK;
615 * Allocate an extent of length minlen<=len<=maxlen, with no position
616 * specified. If we don't get maxlen then use prod to trim
617 * the length, if given. The lengths are all in rtextents.
619 STATIC int /* error */
620 xfs_rtallocate_extent_size(
621 xfs_mount_t *mp, /* file system mount point */
622 xfs_trans_t *tp, /* transaction pointer */
623 xfs_extlen_t minlen, /* minimum length to allocate */
624 xfs_extlen_t maxlen, /* maximum length to allocate */
625 xfs_extlen_t *len, /* out: actual length allocated */
626 xfs_buf_t **rbpp, /* in/out: summary block buffer */
627 xfs_fsblock_t *rsb, /* in/out: summary block number */
628 xfs_extlen_t prod, /* extent product factor */
629 xfs_rtblock_t *rtblock) /* out: start block allocated */
631 int error; /* error value */
632 int i; /* bitmap block number */
633 int l; /* level number (loop control) */
634 xfs_rtblock_t n; /* next block to be tried */
635 xfs_rtblock_t r; /* result block number */
636 xfs_suminfo_t sum; /* summary information for extents */
638 ASSERT(minlen % prod == 0 && maxlen % prod == 0);
642 * Loop over all the levels starting with maxlen.
643 * At each level, look at all the bitmap blocks, to see if there
644 * are extents starting there that are long enough (>= maxlen).
645 * Note, only on the initial level can the allocation fail if
646 * the summary says there's an extent.
648 for (l = xfs_highbit32(maxlen); l < mp->m_rsumlevels; l++) {
650 * Loop over all the bitmap blocks.
652 for (i = 0; i < mp->m_sb.sb_rbmblocks; i++) {
654 * Get the summary for this level/block.
656 error = xfs_rtget_summary(mp, tp, l, i, rbpp, rsb,
662 * Nothing there, on to the next block.
667 * Try allocating the extent.
669 error = xfs_rtallocate_extent_block(mp, tp, i, maxlen,
670 maxlen, len, &n, rbpp, rsb, prod, &r);
675 * If it worked, return that.
677 if (r != NULLRTBLOCK) {
682 * If the "next block to try" returned from the
683 * allocator is beyond the next bitmap block,
684 * skip to that bitmap block.
686 if (XFS_BITTOBLOCK(mp, n) > i + 1)
687 i = XFS_BITTOBLOCK(mp, n) - 1;
691 * Didn't find any maxlen blocks. Try smaller ones, unless
692 * we're asking for a fixed size extent.
694 if (minlen > --maxlen) {
695 *rtblock = NULLRTBLOCK;
702 * Loop over sizes, from maxlen down to minlen.
703 * This time, when we do the allocations, allow smaller ones
706 for (l = xfs_highbit32(maxlen); l >= xfs_highbit32(minlen); l--) {
708 * Loop over all the bitmap blocks, try an allocation
709 * starting in that block.
711 for (i = 0; i < mp->m_sb.sb_rbmblocks; i++) {
713 * Get the summary information for this level/block.
715 error = xfs_rtget_summary(mp, tp, l, i, rbpp, rsb,
721 * If nothing there, go on to next.
726 * Try the allocation. Make sure the specified
727 * minlen/maxlen are in the possible range for
728 * this summary level.
730 error = xfs_rtallocate_extent_block(mp, tp, i,
731 XFS_RTMAX(minlen, 1 << l),
732 XFS_RTMIN(maxlen, (1 << (l + 1)) - 1),
733 len, &n, rbpp, rsb, prod, &r);
738 * If it worked, return that extent.
740 if (r != NULLRTBLOCK) {
745 * If the "next block to try" returned from the
746 * allocator is beyond the next bitmap block,
747 * skip to that bitmap block.
749 if (XFS_BITTOBLOCK(mp, n) > i + 1)
750 i = XFS_BITTOBLOCK(mp, n) - 1;
754 * Got nothing, return failure.
756 *rtblock = NULLRTBLOCK;
761 * Allocate space to the bitmap or summary file, and zero it, for growfs.
763 STATIC int /* error */
765 xfs_mount_t *mp, /* file system mount point */
766 xfs_extlen_t oblocks, /* old count of blocks */
767 xfs_extlen_t nblocks, /* new count of blocks */
768 xfs_inode_t *ip) /* inode (bitmap/summary) */
770 xfs_fileoff_t bno; /* block number in file */
771 xfs_buf_t *bp; /* temporary buffer for zeroing */
772 int committed; /* transaction committed flag */
773 xfs_daddr_t d; /* disk block address */
774 int error; /* error return value */
775 xfs_fsblock_t firstblock; /* first block allocated in xaction */
776 xfs_bmap_free_t flist; /* list of freed blocks */
777 xfs_fsblock_t fsbno; /* filesystem block for bno */
778 xfs_bmbt_irec_t map; /* block map output */
779 int nmap; /* number of block maps */
780 int resblks; /* space reservation */
783 * Allocate space to the file, as necessary.
785 while (oblocks < nblocks) {
789 tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFSRT_ALLOC);
790 resblks = XFS_GROWFSRT_SPACE_RES(mp, nblocks - oblocks);
792 * Reserve space & log for one extent added to the file.
794 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_growrtalloc,
798 cancelflags = XFS_TRANS_RELEASE_LOG_RES;
802 xfs_ilock(ip, XFS_ILOCK_EXCL);
803 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
805 xfs_bmap_init(&flist, &firstblock);
807 * Allocate blocks to the bitmap file.
810 cancelflags |= XFS_TRANS_ABORT;
811 error = xfs_bmapi_write(tp, ip, oblocks, nblocks - oblocks,
812 XFS_BMAPI_METADATA, &firstblock,
813 resblks, &map, &nmap, &flist);
814 if (!error && nmap < 1)
819 * Free any blocks freed up in the transaction, then commit.
821 error = xfs_bmap_finish(&tp, &flist, &committed);
824 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
828 * Now we need to clear the allocated blocks.
829 * Do this one block per transaction, to keep it simple.
832 for (bno = map.br_startoff, fsbno = map.br_startblock;
833 bno < map.br_startoff + map.br_blockcount;
835 tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFSRT_ZERO);
837 * Reserve log for one block zeroing.
839 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_growrtzero,
844 * Lock the bitmap inode.
846 xfs_ilock(ip, XFS_ILOCK_EXCL);
847 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
849 * Get a buffer for the block.
851 d = XFS_FSB_TO_DADDR(mp, fsbno);
852 bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, d,
857 xfs_trans_cancel(tp, cancelflags);
860 memset(bp->b_addr, 0, mp->m_sb.sb_blocksize);
861 xfs_trans_log_buf(tp, bp, 0, mp->m_sb.sb_blocksize - 1);
863 * Commit the transaction.
865 error = xfs_trans_commit(tp, 0);
870 * Go on to the next extent, if any.
872 oblocks = map.br_startoff + map.br_blockcount;
881 * Visible (exported) functions.
885 * Grow the realtime area of the filesystem.
889 xfs_mount_t *mp, /* mount point for filesystem */
890 xfs_growfs_rt_t *in) /* growfs rt input struct */
892 xfs_rtblock_t bmbno; /* bitmap block number */
893 xfs_buf_t *bp; /* temporary buffer */
894 int error; /* error return value */
895 xfs_mount_t *nmp; /* new (fake) mount structure */
896 xfs_rfsblock_t nrblocks; /* new number of realtime blocks */
897 xfs_extlen_t nrbmblocks; /* new number of rt bitmap blocks */
898 xfs_rtblock_t nrextents; /* new number of realtime extents */
899 uint8_t nrextslog; /* new log2 of sb_rextents */
900 xfs_extlen_t nrsumblocks; /* new number of summary blocks */
901 uint nrsumlevels; /* new rt summary levels */
902 uint nrsumsize; /* new size of rt summary, bytes */
903 xfs_sb_t *nsbp; /* new superblock */
904 xfs_extlen_t rbmblocks; /* current number of rt bitmap blocks */
905 xfs_extlen_t rsumblocks; /* current number of rt summary blks */
906 xfs_sb_t *sbp; /* old superblock */
907 xfs_fsblock_t sumbno; /* summary block number */
911 * Initial error checking.
913 if (!capable(CAP_SYS_ADMIN))
915 if (mp->m_rtdev_targp == NULL || mp->m_rbmip == NULL ||
916 (nrblocks = in->newblocks) <= sbp->sb_rblocks ||
917 (sbp->sb_rblocks && (in->extsize != sbp->sb_rextsize)))
919 if ((error = xfs_sb_validate_fsb_count(sbp, nrblocks)))
922 * Read in the last block of the device, make sure it exists.
924 bp = xfs_buf_read_uncached(mp->m_rtdev_targp,
925 XFS_FSB_TO_BB(mp, nrblocks - 1),
926 XFS_FSB_TO_BB(mp, 1), 0, NULL);
937 * Calculate new parameters. These are the final values to be reached.
939 nrextents = nrblocks;
940 do_div(nrextents, in->extsize);
941 nrbmblocks = howmany_64(nrextents, NBBY * sbp->sb_blocksize);
942 nrextslog = xfs_highbit32(nrextents);
943 nrsumlevels = nrextslog + 1;
944 nrsumsize = (uint)sizeof(xfs_suminfo_t) * nrsumlevels * nrbmblocks;
945 nrsumblocks = XFS_B_TO_FSB(mp, nrsumsize);
946 nrsumsize = XFS_FSB_TO_B(mp, nrsumblocks);
948 * New summary size can't be more than half the size of
949 * the log. This prevents us from getting a log overflow,
950 * since we'll log basically the whole summary file at once.
952 if (nrsumblocks > (mp->m_sb.sb_logblocks >> 1))
955 * Get the old block counts for bitmap and summary inodes.
956 * These can't change since other growfs callers are locked out.
958 rbmblocks = XFS_B_TO_FSB(mp, mp->m_rbmip->i_d.di_size);
959 rsumblocks = XFS_B_TO_FSB(mp, mp->m_rsumip->i_d.di_size);
961 * Allocate space to the bitmap and summary files, as necessary.
963 error = xfs_growfs_rt_alloc(mp, rbmblocks, nrbmblocks, mp->m_rbmip);
966 error = xfs_growfs_rt_alloc(mp, rsumblocks, nrsumblocks, mp->m_rsumip);
970 * Allocate a new (fake) mount/sb.
972 nmp = kmem_alloc(sizeof(*nmp), KM_SLEEP);
974 * Loop over the bitmap blocks.
975 * We will do everything one bitmap block at a time.
976 * Skip the current block if it is exactly full.
977 * This also deals with the case where there were no rtextents before.
979 for (bmbno = sbp->sb_rbmblocks -
980 ((sbp->sb_rextents & ((1 << mp->m_blkbit_log) - 1)) != 0);
989 * Calculate new sb and mount fields for this round.
991 nsbp->sb_rextsize = in->extsize;
992 nsbp->sb_rbmblocks = bmbno + 1;
995 nsbp->sb_rbmblocks * NBBY *
996 nsbp->sb_blocksize * nsbp->sb_rextsize);
997 nsbp->sb_rextents = nsbp->sb_rblocks;
998 do_div(nsbp->sb_rextents, nsbp->sb_rextsize);
999 ASSERT(nsbp->sb_rextents != 0);
1000 nsbp->sb_rextslog = xfs_highbit32(nsbp->sb_rextents);
1001 nrsumlevels = nmp->m_rsumlevels = nsbp->sb_rextslog + 1;
1003 (uint)sizeof(xfs_suminfo_t) * nrsumlevels *
1005 nrsumblocks = XFS_B_TO_FSB(mp, nrsumsize);
1006 nmp->m_rsumsize = nrsumsize = XFS_FSB_TO_B(mp, nrsumblocks);
1008 * Start a transaction, get the log reservation.
1010 tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFSRT_FREE);
1011 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_growrtfree,
1016 * Lock out other callers by grabbing the bitmap inode lock.
1018 xfs_ilock(mp->m_rbmip, XFS_ILOCK_EXCL);
1019 xfs_trans_ijoin(tp, mp->m_rbmip, XFS_ILOCK_EXCL);
1021 * Update the bitmap inode's size.
1023 mp->m_rbmip->i_d.di_size =
1024 nsbp->sb_rbmblocks * nsbp->sb_blocksize;
1025 xfs_trans_log_inode(tp, mp->m_rbmip, XFS_ILOG_CORE);
1026 cancelflags |= XFS_TRANS_ABORT;
1028 * Get the summary inode into the transaction.
1030 xfs_ilock(mp->m_rsumip, XFS_ILOCK_EXCL);
1031 xfs_trans_ijoin(tp, mp->m_rsumip, XFS_ILOCK_EXCL);
1033 * Update the summary inode's size.
1035 mp->m_rsumip->i_d.di_size = nmp->m_rsumsize;
1036 xfs_trans_log_inode(tp, mp->m_rsumip, XFS_ILOG_CORE);
1038 * Copy summary data from old to new sizes.
1039 * Do this when the real size (not block-aligned) changes.
1041 if (sbp->sb_rbmblocks != nsbp->sb_rbmblocks ||
1042 mp->m_rsumlevels != nmp->m_rsumlevels) {
1043 error = xfs_rtcopy_summary(mp, nmp, tp);
1048 * Update superblock fields.
1050 if (nsbp->sb_rextsize != sbp->sb_rextsize)
1051 xfs_trans_mod_sb(tp, XFS_TRANS_SB_REXTSIZE,
1052 nsbp->sb_rextsize - sbp->sb_rextsize);
1053 if (nsbp->sb_rbmblocks != sbp->sb_rbmblocks)
1054 xfs_trans_mod_sb(tp, XFS_TRANS_SB_RBMBLOCKS,
1055 nsbp->sb_rbmblocks - sbp->sb_rbmblocks);
1056 if (nsbp->sb_rblocks != sbp->sb_rblocks)
1057 xfs_trans_mod_sb(tp, XFS_TRANS_SB_RBLOCKS,
1058 nsbp->sb_rblocks - sbp->sb_rblocks);
1059 if (nsbp->sb_rextents != sbp->sb_rextents)
1060 xfs_trans_mod_sb(tp, XFS_TRANS_SB_REXTENTS,
1061 nsbp->sb_rextents - sbp->sb_rextents);
1062 if (nsbp->sb_rextslog != sbp->sb_rextslog)
1063 xfs_trans_mod_sb(tp, XFS_TRANS_SB_REXTSLOG,
1064 nsbp->sb_rextslog - sbp->sb_rextslog);
1069 error = xfs_rtfree_range(nmp, tp, sbp->sb_rextents,
1070 nsbp->sb_rextents - sbp->sb_rextents, &bp, &sumbno);
1073 xfs_trans_cancel(tp, cancelflags);
1077 * Mark more blocks free in the superblock.
1079 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FREXTENTS,
1080 nsbp->sb_rextents - sbp->sb_rextents);
1082 * Update mp values into the real mp structure.
1084 mp->m_rsumlevels = nrsumlevels;
1085 mp->m_rsumsize = nrsumsize;
1087 error = xfs_trans_commit(tp, 0);
1093 * Free the fake mp structure.
1101 * Allocate an extent in the realtime subvolume, with the usual allocation
1102 * parameters. The length units are all in realtime extents, as is the
1103 * result block number.
1106 xfs_rtallocate_extent(
1107 xfs_trans_t *tp, /* transaction pointer */
1108 xfs_rtblock_t bno, /* starting block number to allocate */
1109 xfs_extlen_t minlen, /* minimum length to allocate */
1110 xfs_extlen_t maxlen, /* maximum length to allocate */
1111 xfs_extlen_t *len, /* out: actual length allocated */
1112 xfs_alloctype_t type, /* allocation type XFS_ALLOCTYPE... */
1113 int wasdel, /* was a delayed allocation extent */
1114 xfs_extlen_t prod, /* extent product factor */
1115 xfs_rtblock_t *rtblock) /* out: start block allocated */
1117 xfs_mount_t *mp = tp->t_mountp;
1118 int error; /* error value */
1119 xfs_rtblock_t r; /* result allocated block */
1120 xfs_fsblock_t sb; /* summary file block number */
1121 xfs_buf_t *sumbp; /* summary file block buffer */
1123 ASSERT(xfs_isilocked(mp->m_rbmip, XFS_ILOCK_EXCL));
1124 ASSERT(minlen > 0 && minlen <= maxlen);
1127 * If prod is set then figure out what to do to minlen and maxlen.
1132 if ((i = maxlen % prod))
1134 if ((i = minlen % prod))
1136 if (maxlen < minlen) {
1137 *rtblock = NULLRTBLOCK;
1144 * Allocate by size, or near another block, or exactly at some block.
1147 case XFS_ALLOCTYPE_ANY_AG:
1148 error = xfs_rtallocate_extent_size(mp, tp, minlen, maxlen, len,
1149 &sumbp, &sb, prod, &r);
1151 case XFS_ALLOCTYPE_NEAR_BNO:
1152 error = xfs_rtallocate_extent_near(mp, tp, bno, minlen, maxlen,
1153 len, &sumbp, &sb, prod, &r);
1155 case XFS_ALLOCTYPE_THIS_BNO:
1156 error = xfs_rtallocate_extent_exact(mp, tp, bno, minlen, maxlen,
1157 len, &sumbp, &sb, prod, &r);
1167 * If it worked, update the superblock.
1169 if (r != NULLRTBLOCK) {
1170 long slen = (long)*len;
1172 ASSERT(*len >= minlen && *len <= maxlen);
1174 xfs_trans_mod_sb(tp, XFS_TRANS_SB_RES_FREXTENTS, -slen);
1176 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FREXTENTS, -slen);
1183 * Initialize realtime fields in the mount structure.
1187 xfs_mount_t *mp) /* file system mount structure */
1189 xfs_buf_t *bp; /* buffer for last block of subvolume */
1190 xfs_daddr_t d; /* address of last block of subvolume */
1191 xfs_sb_t *sbp; /* filesystem superblock copy in mount */
1194 if (sbp->sb_rblocks == 0)
1196 if (mp->m_rtdev_targp == NULL) {
1198 "Filesystem has a realtime volume, use rtdev=device option");
1201 mp->m_rsumlevels = sbp->sb_rextslog + 1;
1203 (uint)sizeof(xfs_suminfo_t) * mp->m_rsumlevels *
1205 mp->m_rsumsize = roundup(mp->m_rsumsize, sbp->sb_blocksize);
1206 mp->m_rbmip = mp->m_rsumip = NULL;
1208 * Check that the realtime section is an ok size.
1210 d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_rblocks);
1211 if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_rblocks) {
1212 xfs_warn(mp, "realtime mount -- %llu != %llu",
1213 (unsigned long long) XFS_BB_TO_FSB(mp, d),
1214 (unsigned long long) mp->m_sb.sb_rblocks);
1217 bp = xfs_buf_read_uncached(mp->m_rtdev_targp,
1218 d - XFS_FSB_TO_BB(mp, 1),
1219 XFS_FSB_TO_BB(mp, 1), 0, NULL);
1220 if (!bp || bp->b_error) {
1221 xfs_warn(mp, "realtime device size check failed");
1231 * Get the bitmap and summary inodes into the mount structure
1236 xfs_mount_t *mp) /* file system mount structure */
1238 int error; /* error return value */
1242 if (sbp->sb_rbmino == NULLFSINO)
1244 error = xfs_iget(mp, NULL, sbp->sb_rbmino, 0, 0, &mp->m_rbmip);
1247 ASSERT(mp->m_rbmip != NULL);
1248 ASSERT(sbp->sb_rsumino != NULLFSINO);
1249 error = xfs_iget(mp, NULL, sbp->sb_rsumino, 0, 0, &mp->m_rsumip);
1254 ASSERT(mp->m_rsumip != NULL);
1259 xfs_rtunmount_inodes(
1260 struct xfs_mount *mp)
1265 IRELE(mp->m_rsumip);
1269 * Pick an extent for allocation at the start of a new realtime file.
1270 * Use the sequence number stored in the atime field of the bitmap inode.
1271 * Translate this to a fraction of the rtextents, and return the product
1272 * of rtextents and the fraction.
1273 * The fraction sequence is 0, 1/2, 1/4, 3/4, 1/8, ..., 7/8, 1/16, ...
1277 xfs_mount_t *mp, /* file system mount point */
1278 xfs_trans_t *tp, /* transaction pointer */
1279 xfs_extlen_t len, /* allocation length (rtextents) */
1280 xfs_rtblock_t *pick) /* result rt extent */
1282 xfs_rtblock_t b; /* result block */
1283 int log2; /* log of sequence number */
1284 __uint64_t resid; /* residual after log removed */
1285 __uint64_t seq; /* sequence number of file creation */
1286 __uint64_t *seqp; /* pointer to seqno in inode */
1288 ASSERT(xfs_isilocked(mp->m_rbmip, XFS_ILOCK_EXCL));
1290 seqp = (__uint64_t *)&mp->m_rbmip->i_d.di_atime;
1291 if (!(mp->m_rbmip->i_d.di_flags & XFS_DIFLAG_NEWRTBM)) {
1292 mp->m_rbmip->i_d.di_flags |= XFS_DIFLAG_NEWRTBM;
1296 if ((log2 = xfs_highbit64(seq)) == -1)
1299 resid = seq - (1ULL << log2);
1300 b = (mp->m_sb.sb_rextents * ((resid << 1) + 1ULL)) >>
1302 if (b >= mp->m_sb.sb_rextents)
1303 b = do_mod(b, mp->m_sb.sb_rextents);
1304 if (b + len > mp->m_sb.sb_rextents)
1305 b = mp->m_sb.sb_rextents - len;
1308 xfs_trans_log_inode(tp, mp->m_rbmip, XFS_ILOG_CORE);