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"
25 #include "xfs_mount.h"
26 #include "xfs_inode.h"
28 #include "xfs_bmap_util.h"
29 #include "xfs_bmap_btree.h"
30 #include "xfs_alloc.h"
31 #include "xfs_error.h"
32 #include "xfs_trans.h"
33 #include "xfs_trans_space.h"
34 #include "xfs_trace.h"
36 #include "xfs_icache.h"
37 #include "xfs_rtalloc.h"
41 * Read and return the summary information for a given extent size,
42 * bitmap block combination.
43 * Keeps track of a current summary block, so we don't keep reading
44 * it from the buffer cache.
48 xfs_mount_t *mp, /* file system mount structure */
49 xfs_trans_t *tp, /* transaction pointer */
50 int log, /* log2 of extent size */
51 xfs_rtblock_t bbno, /* bitmap block number */
52 xfs_buf_t **rbpp, /* in/out: summary block buffer */
53 xfs_fsblock_t *rsb, /* in/out: summary block number */
54 xfs_suminfo_t *sum) /* out: summary info for this block */
56 return xfs_rtmodify_summary_int(mp, tp, log, bbno, 0, rbpp, rsb, sum);
60 * Return whether there are any free extents in the size range given
61 * by low and high, for the bitmap block bbno.
63 STATIC int /* error */
65 xfs_mount_t *mp, /* file system mount structure */
66 xfs_trans_t *tp, /* transaction pointer */
67 int low, /* low log2 extent size */
68 int high, /* high log2 extent size */
69 xfs_rtblock_t bbno, /* bitmap block number */
70 xfs_buf_t **rbpp, /* in/out: summary block buffer */
71 xfs_fsblock_t *rsb, /* in/out: summary block number */
72 int *stat) /* out: any good extents here? */
74 int error; /* error value */
75 int log; /* loop counter, log2 of ext. size */
76 xfs_suminfo_t sum; /* summary data */
79 * Loop over logs of extent sizes. Order is irrelevant.
81 for (log = low; log <= high; log++) {
83 * Get one summary datum.
85 error = xfs_rtget_summary(mp, tp, log, bbno, rbpp, rsb, &sum);
90 * If there are any, return success.
98 * Found nothing, return failure.
106 * Copy and transform the summary file, given the old and new
107 * parameters in the mount structures.
109 STATIC int /* error */
111 xfs_mount_t *omp, /* old file system mount point */
112 xfs_mount_t *nmp, /* new file system mount point */
113 xfs_trans_t *tp) /* transaction pointer */
115 xfs_rtblock_t bbno; /* bitmap block number */
116 xfs_buf_t *bp; /* summary buffer */
117 int error; /* error return value */
118 int log; /* summary level number (log length) */
119 xfs_suminfo_t sum; /* summary data */
120 xfs_fsblock_t sumbno; /* summary block number */
123 for (log = omp->m_rsumlevels - 1; log >= 0; log--) {
124 for (bbno = omp->m_sb.sb_rbmblocks - 1;
125 (xfs_srtblock_t)bbno >= 0;
127 error = xfs_rtget_summary(omp, tp, log, bbno, &bp,
133 error = xfs_rtmodify_summary(omp, tp, log, bbno, -sum,
137 error = xfs_rtmodify_summary(nmp, tp, log, bbno, sum,
147 * Mark an extent specified by start and len allocated.
148 * Updates all the summary information as well as the bitmap.
150 STATIC int /* error */
151 xfs_rtallocate_range(
152 xfs_mount_t *mp, /* file system mount point */
153 xfs_trans_t *tp, /* transaction pointer */
154 xfs_rtblock_t start, /* start block to allocate */
155 xfs_extlen_t len, /* length to allocate */
156 xfs_buf_t **rbpp, /* in/out: summary block buffer */
157 xfs_fsblock_t *rsb) /* in/out: summary block number */
159 xfs_rtblock_t end; /* end of the allocated extent */
160 int error; /* error value */
161 xfs_rtblock_t postblock = 0; /* first block allocated > end */
162 xfs_rtblock_t preblock = 0; /* first block allocated < start */
164 end = start + len - 1;
166 * Assume we're allocating out of the middle of a free extent.
167 * We need to find the beginning and end of the extent so we can
168 * properly update the summary.
170 error = xfs_rtfind_back(mp, tp, start, 0, &preblock);
175 * Find the next allocated block (end of free extent).
177 error = xfs_rtfind_forw(mp, tp, end, mp->m_sb.sb_rextents - 1,
183 * Decrement the summary information corresponding to the entire
186 error = xfs_rtmodify_summary(mp, tp,
187 XFS_RTBLOCKLOG(postblock + 1 - preblock),
188 XFS_BITTOBLOCK(mp, preblock), -1, rbpp, rsb);
193 * If there are blocks not being allocated at the front of the
194 * old extent, add summary data for them to be free.
196 if (preblock < start) {
197 error = xfs_rtmodify_summary(mp, tp,
198 XFS_RTBLOCKLOG(start - preblock),
199 XFS_BITTOBLOCK(mp, preblock), 1, rbpp, rsb);
205 * If there are blocks not being allocated at the end of the
206 * old extent, add summary data for them to be free.
208 if (postblock > end) {
209 error = xfs_rtmodify_summary(mp, tp,
210 XFS_RTBLOCKLOG(postblock - end),
211 XFS_BITTOBLOCK(mp, end + 1), 1, rbpp, rsb);
217 * Modify the bitmap to mark this extent allocated.
219 error = xfs_rtmodify_range(mp, tp, start, len, 0);
224 * Attempt to allocate an extent minlen<=len<=maxlen starting from
225 * bitmap block bbno. If we don't get maxlen then use prod to trim
226 * the length, if given. Returns error; returns starting block in *rtblock.
227 * The lengths are all in rtextents.
229 STATIC int /* error */
230 xfs_rtallocate_extent_block(
231 xfs_mount_t *mp, /* file system mount point */
232 xfs_trans_t *tp, /* transaction pointer */
233 xfs_rtblock_t bbno, /* bitmap block number */
234 xfs_extlen_t minlen, /* minimum length to allocate */
235 xfs_extlen_t maxlen, /* maximum length to allocate */
236 xfs_extlen_t *len, /* out: actual length allocated */
237 xfs_rtblock_t *nextp, /* out: next block to try */
238 xfs_buf_t **rbpp, /* in/out: summary block buffer */
239 xfs_fsblock_t *rsb, /* in/out: summary block number */
240 xfs_extlen_t prod, /* extent product factor */
241 xfs_rtblock_t *rtblock) /* out: start block allocated */
243 xfs_rtblock_t besti; /* best rtblock found so far */
244 xfs_rtblock_t bestlen; /* best length found so far */
245 xfs_rtblock_t end; /* last rtblock in chunk */
246 int error; /* error value */
247 xfs_rtblock_t i; /* current rtblock trying */
248 xfs_rtblock_t next; /* next rtblock to try */
249 int stat; /* status from internal calls */
252 * Loop over all the extents starting in this bitmap block,
253 * looking for one that's long enough.
255 for (i = XFS_BLOCKTOBIT(mp, bbno), besti = -1, bestlen = 0,
256 end = XFS_BLOCKTOBIT(mp, bbno + 1) - 1;
259 /* Make sure we don't scan off the end of the rt volume. */
260 maxlen = min(mp->m_sb.sb_rextents, i + maxlen) - i;
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 /* Make sure we don't run off the end of the rt volume. */
455 maxlen = min(mp->m_sb.sb_rextents, bno + maxlen) - bno;
456 if (maxlen < minlen) {
457 *rtblock = NULLRTBLOCK;
462 * Try the exact allocation first.
464 error = xfs_rtallocate_extent_exact(mp, tp, bno, minlen, maxlen, len,
465 rbpp, rsb, prod, &r);
470 * If the exact allocation worked, return that.
472 if (r != NULLRTBLOCK) {
476 bbno = XFS_BITTOBLOCK(mp, bno);
479 log2len = xfs_highbit32(minlen);
481 * Loop over all bitmap blocks (bbno + i is current block).
485 * Get summary information of extents of all useful levels
486 * starting in this bitmap block.
488 error = xfs_rtany_summary(mp, tp, log2len, mp->m_rsumlevels - 1,
489 bbno + i, rbpp, rsb, &any);
494 * If there are any useful extents starting here, try
499 * On the positive side of the starting location.
503 * Try to allocate an extent starting in
506 error = xfs_rtallocate_extent_block(mp, tp,
507 bbno + i, minlen, maxlen, len, &n, rbpp,
513 * If it worked, return it.
515 if (r != NULLRTBLOCK) {
521 * On the negative side of the starting location.
525 * Loop backwards through the bitmap blocks from
526 * the starting point-1 up to where we are now.
527 * There should be an extent which ends in this
528 * bitmap block and is long enough.
530 for (j = -1; j > i; j--) {
532 * Grab the summary information for
535 error = xfs_rtany_summary(mp, tp,
536 log2len, mp->m_rsumlevels - 1,
537 bbno + j, rbpp, rsb, &any);
542 * If there's no extent given in the
543 * summary that means the extent we
544 * found must carry over from an
545 * earlier block. If there is an
546 * extent given, we've already tried
547 * that allocation, don't do it again.
551 error = xfs_rtallocate_extent_block(mp,
552 tp, bbno + j, minlen, maxlen,
553 len, &n, rbpp, rsb, prod, &r);
558 * If it works, return the extent.
560 if (r != NULLRTBLOCK) {
566 * There weren't intervening bitmap blocks
567 * with a long enough extent, or the
568 * allocation didn't work for some reason
569 * (i.e. it's a little * too short).
570 * Try to allocate from the summary block
573 error = xfs_rtallocate_extent_block(mp, tp,
574 bbno + i, minlen, maxlen, len, &n, rbpp,
580 * If it works, return the extent.
582 if (r != NULLRTBLOCK) {
589 * Loop control. If we were on the positive side, and there's
590 * still more blocks on the negative side, go there.
592 if (i > 0 && (int)bbno - i >= 0)
595 * If positive, and no more negative, but there are more
596 * positive, go there.
598 else if (i > 0 && (int)bbno + i < mp->m_sb.sb_rbmblocks - 1)
601 * If negative or 0 (just started), and there are positive
602 * blocks to go, go there. The 0 case moves to block 1.
604 else if (i <= 0 && (int)bbno - i < mp->m_sb.sb_rbmblocks - 1)
607 * If negative or 0 and there are more negative blocks,
610 else if (i <= 0 && (int)bbno + i > 0)
613 * Must be done. Return failure.
618 *rtblock = NULLRTBLOCK;
623 * Allocate an extent of length minlen<=len<=maxlen, with no position
624 * specified. If we don't get maxlen then use prod to trim
625 * the length, if given. The lengths are all in rtextents.
627 STATIC int /* error */
628 xfs_rtallocate_extent_size(
629 xfs_mount_t *mp, /* file system mount point */
630 xfs_trans_t *tp, /* transaction pointer */
631 xfs_extlen_t minlen, /* minimum length to allocate */
632 xfs_extlen_t maxlen, /* maximum length to allocate */
633 xfs_extlen_t *len, /* out: actual length allocated */
634 xfs_buf_t **rbpp, /* in/out: summary block buffer */
635 xfs_fsblock_t *rsb, /* in/out: summary block number */
636 xfs_extlen_t prod, /* extent product factor */
637 xfs_rtblock_t *rtblock) /* out: start block allocated */
639 int error; /* error value */
640 int i; /* bitmap block number */
641 int l; /* level number (loop control) */
642 xfs_rtblock_t n; /* next block to be tried */
643 xfs_rtblock_t r; /* result block number */
644 xfs_suminfo_t sum; /* summary information for extents */
646 ASSERT(minlen % prod == 0 && maxlen % prod == 0);
650 * Loop over all the levels starting with maxlen.
651 * At each level, look at all the bitmap blocks, to see if there
652 * are extents starting there that are long enough (>= maxlen).
653 * Note, only on the initial level can the allocation fail if
654 * the summary says there's an extent.
656 for (l = xfs_highbit32(maxlen); l < mp->m_rsumlevels; l++) {
658 * Loop over all the bitmap blocks.
660 for (i = 0; i < mp->m_sb.sb_rbmblocks; i++) {
662 * Get the summary for this level/block.
664 error = xfs_rtget_summary(mp, tp, l, i, rbpp, rsb,
670 * Nothing there, on to the next block.
675 * Try allocating the extent.
677 error = xfs_rtallocate_extent_block(mp, tp, i, maxlen,
678 maxlen, len, &n, rbpp, rsb, prod, &r);
683 * If it worked, return that.
685 if (r != NULLRTBLOCK) {
690 * If the "next block to try" returned from the
691 * allocator is beyond the next bitmap block,
692 * skip to that bitmap block.
694 if (XFS_BITTOBLOCK(mp, n) > i + 1)
695 i = XFS_BITTOBLOCK(mp, n) - 1;
699 * Didn't find any maxlen blocks. Try smaller ones, unless
700 * we're asking for a fixed size extent.
702 if (minlen > --maxlen) {
703 *rtblock = NULLRTBLOCK;
710 * Loop over sizes, from maxlen down to minlen.
711 * This time, when we do the allocations, allow smaller ones
714 for (l = xfs_highbit32(maxlen); l >= xfs_highbit32(minlen); l--) {
716 * Loop over all the bitmap blocks, try an allocation
717 * starting in that block.
719 for (i = 0; i < mp->m_sb.sb_rbmblocks; i++) {
721 * Get the summary information for this level/block.
723 error = xfs_rtget_summary(mp, tp, l, i, rbpp, rsb,
729 * If nothing there, go on to next.
734 * Try the allocation. Make sure the specified
735 * minlen/maxlen are in the possible range for
736 * this summary level.
738 error = xfs_rtallocate_extent_block(mp, tp, i,
739 XFS_RTMAX(minlen, 1 << l),
740 XFS_RTMIN(maxlen, (1 << (l + 1)) - 1),
741 len, &n, rbpp, rsb, prod, &r);
746 * If it worked, return that extent.
748 if (r != NULLRTBLOCK) {
753 * If the "next block to try" returned from the
754 * allocator is beyond the next bitmap block,
755 * skip to that bitmap block.
757 if (XFS_BITTOBLOCK(mp, n) > i + 1)
758 i = XFS_BITTOBLOCK(mp, n) - 1;
762 * Got nothing, return failure.
764 *rtblock = NULLRTBLOCK;
769 * Allocate space to the bitmap or summary file, and zero it, for growfs.
773 struct xfs_mount *mp, /* file system mount point */
774 xfs_extlen_t oblocks, /* old count of blocks */
775 xfs_extlen_t nblocks, /* new count of blocks */
776 struct xfs_inode *ip) /* inode (bitmap/summary) */
778 xfs_fileoff_t bno; /* block number in file */
779 struct xfs_buf *bp; /* temporary buffer for zeroing */
780 int committed; /* transaction committed flag */
781 xfs_daddr_t d; /* disk block address */
782 int error; /* error return value */
783 xfs_fsblock_t firstblock;/* first block allocated in xaction */
784 struct xfs_bmap_free flist; /* list of freed blocks */
785 xfs_fsblock_t fsbno; /* filesystem block for bno */
786 struct xfs_bmbt_irec map; /* block map output */
787 int nmap; /* number of block maps */
788 int resblks; /* space reservation */
789 struct xfs_trans *tp;
792 * Allocate space to the file, as necessary.
794 while (oblocks < nblocks) {
795 tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFSRT_ALLOC);
796 resblks = XFS_GROWFSRT_SPACE_RES(mp, nblocks - oblocks);
798 * Reserve space & log for one extent added to the file.
800 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_growrtalloc,
803 goto out_trans_cancel;
807 xfs_ilock(ip, XFS_ILOCK_EXCL);
808 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
810 xfs_bmap_init(&flist, &firstblock);
812 * Allocate blocks to the bitmap file.
815 error = xfs_bmapi_write(tp, ip, oblocks, nblocks - oblocks,
816 XFS_BMAPI_METADATA, &firstblock,
817 resblks, &map, &nmap, &flist);
818 if (!error && nmap < 1)
821 goto out_bmap_cancel;
823 * Free any blocks freed up in the transaction, then commit.
825 error = xfs_bmap_finish(&tp, &flist, &committed);
827 goto out_bmap_cancel;
828 error = xfs_trans_commit(tp);
832 * Now we need to clear the allocated blocks.
833 * Do this one block per transaction, to keep it simple.
835 for (bno = map.br_startoff, fsbno = map.br_startblock;
836 bno < map.br_startoff + map.br_blockcount;
838 tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFSRT_ZERO);
840 * Reserve log for one block zeroing.
842 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_growrtzero,
845 goto out_trans_cancel;
847 * Lock the bitmap inode.
849 xfs_ilock(ip, XFS_ILOCK_EXCL);
850 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
852 * Get a buffer for the block.
854 d = XFS_FSB_TO_DADDR(mp, fsbno);
855 bp = xfs_trans_get_buf(tp, mp->m_ddev_targp, d,
859 goto out_trans_cancel;
861 memset(bp->b_addr, 0, mp->m_sb.sb_blocksize);
862 xfs_trans_log_buf(tp, bp, 0, mp->m_sb.sb_blocksize - 1);
864 * Commit the transaction.
866 error = xfs_trans_commit(tp);
871 * Go on to the next extent, if any.
873 oblocks = map.br_startoff + map.br_blockcount;
879 xfs_bmap_cancel(&flist);
881 xfs_trans_cancel(tp);
886 * Visible (exported) functions.
890 * Grow the realtime area of the filesystem.
894 xfs_mount_t *mp, /* mount point for filesystem */
895 xfs_growfs_rt_t *in) /* growfs rt input struct */
897 xfs_rtblock_t bmbno; /* bitmap block number */
898 xfs_buf_t *bp; /* temporary buffer */
899 int error; /* error return value */
900 xfs_mount_t *nmp; /* new (fake) mount structure */
901 xfs_rfsblock_t nrblocks; /* new number of realtime blocks */
902 xfs_extlen_t nrbmblocks; /* new number of rt bitmap blocks */
903 xfs_rtblock_t nrextents; /* new number of realtime extents */
904 uint8_t nrextslog; /* new log2 of sb_rextents */
905 xfs_extlen_t nrsumblocks; /* new number of summary blocks */
906 uint nrsumlevels; /* new rt summary levels */
907 uint nrsumsize; /* new size of rt summary, bytes */
908 xfs_sb_t *nsbp; /* new superblock */
909 xfs_extlen_t rbmblocks; /* current number of rt bitmap blocks */
910 xfs_extlen_t rsumblocks; /* current number of rt summary blks */
911 xfs_sb_t *sbp; /* old superblock */
912 xfs_fsblock_t sumbno; /* summary block number */
916 * Initial error checking.
918 if (!capable(CAP_SYS_ADMIN))
920 if (mp->m_rtdev_targp == NULL || mp->m_rbmip == NULL ||
921 (nrblocks = in->newblocks) <= sbp->sb_rblocks ||
922 (sbp->sb_rblocks && (in->extsize != sbp->sb_rextsize)))
924 if ((error = xfs_sb_validate_fsb_count(sbp, nrblocks)))
927 * Read in the last block of the device, make sure it exists.
929 error = xfs_buf_read_uncached(mp->m_rtdev_targp,
930 XFS_FSB_TO_BB(mp, nrblocks - 1),
931 XFS_FSB_TO_BB(mp, 1), 0, &bp, 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);
988 * Calculate new sb and mount fields for this round.
990 nsbp->sb_rextsize = in->extsize;
991 nsbp->sb_rbmblocks = bmbno + 1;
994 nsbp->sb_rbmblocks * NBBY *
995 nsbp->sb_blocksize * nsbp->sb_rextsize);
996 nsbp->sb_rextents = nsbp->sb_rblocks;
997 do_div(nsbp->sb_rextents, nsbp->sb_rextsize);
998 ASSERT(nsbp->sb_rextents != 0);
999 nsbp->sb_rextslog = xfs_highbit32(nsbp->sb_rextents);
1000 nrsumlevels = nmp->m_rsumlevels = nsbp->sb_rextslog + 1;
1002 (uint)sizeof(xfs_suminfo_t) * nrsumlevels *
1004 nrsumblocks = XFS_B_TO_FSB(mp, nrsumsize);
1005 nmp->m_rsumsize = nrsumsize = XFS_FSB_TO_B(mp, nrsumblocks);
1007 * Start a transaction, get the log reservation.
1009 tp = xfs_trans_alloc(mp, XFS_TRANS_GROWFSRT_FREE);
1010 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_growrtfree,
1015 * Lock out other callers by grabbing the bitmap inode lock.
1017 xfs_ilock(mp->m_rbmip, XFS_ILOCK_EXCL);
1018 xfs_trans_ijoin(tp, mp->m_rbmip, XFS_ILOCK_EXCL);
1020 * Update the bitmap inode's size ondisk and incore. We need
1021 * to update the incore size so that inode inactivation won't
1022 * punch what it thinks are "posteof" blocks.
1024 mp->m_rbmip->i_d.di_size =
1025 nsbp->sb_rbmblocks * nsbp->sb_blocksize;
1026 i_size_write(VFS_I(mp->m_rbmip), mp->m_rbmip->i_d.di_size);
1027 xfs_trans_log_inode(tp, mp->m_rbmip, XFS_ILOG_CORE);
1029 * Get the summary inode into the transaction.
1031 xfs_ilock(mp->m_rsumip, XFS_ILOCK_EXCL);
1032 xfs_trans_ijoin(tp, mp->m_rsumip, XFS_ILOCK_EXCL);
1034 * Update the summary inode's size. We need to update the
1035 * incore size so that inode inactivation won't punch what it
1036 * thinks are "posteof" blocks.
1038 mp->m_rsumip->i_d.di_size = nmp->m_rsumsize;
1039 i_size_write(VFS_I(mp->m_rsumip), mp->m_rsumip->i_d.di_size);
1040 xfs_trans_log_inode(tp, mp->m_rsumip, XFS_ILOG_CORE);
1042 * Copy summary data from old to new sizes.
1043 * Do this when the real size (not block-aligned) changes.
1045 if (sbp->sb_rbmblocks != nsbp->sb_rbmblocks ||
1046 mp->m_rsumlevels != nmp->m_rsumlevels) {
1047 error = xfs_rtcopy_summary(mp, nmp, tp);
1052 * Update superblock fields.
1054 if (nsbp->sb_rextsize != sbp->sb_rextsize)
1055 xfs_trans_mod_sb(tp, XFS_TRANS_SB_REXTSIZE,
1056 nsbp->sb_rextsize - sbp->sb_rextsize);
1057 if (nsbp->sb_rbmblocks != sbp->sb_rbmblocks)
1058 xfs_trans_mod_sb(tp, XFS_TRANS_SB_RBMBLOCKS,
1059 nsbp->sb_rbmblocks - sbp->sb_rbmblocks);
1060 if (nsbp->sb_rblocks != sbp->sb_rblocks)
1061 xfs_trans_mod_sb(tp, XFS_TRANS_SB_RBLOCKS,
1062 nsbp->sb_rblocks - sbp->sb_rblocks);
1063 if (nsbp->sb_rextents != sbp->sb_rextents)
1064 xfs_trans_mod_sb(tp, XFS_TRANS_SB_REXTENTS,
1065 nsbp->sb_rextents - sbp->sb_rextents);
1066 if (nsbp->sb_rextslog != sbp->sb_rextslog)
1067 xfs_trans_mod_sb(tp, XFS_TRANS_SB_REXTSLOG,
1068 nsbp->sb_rextslog - sbp->sb_rextslog);
1073 error = xfs_rtfree_range(nmp, tp, sbp->sb_rextents,
1074 nsbp->sb_rextents - sbp->sb_rextents, &bp, &sumbno);
1077 xfs_trans_cancel(tp);
1081 * Mark more blocks free in the superblock.
1083 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FREXTENTS,
1084 nsbp->sb_rextents - sbp->sb_rextents);
1086 * Update mp values into the real mp structure.
1088 mp->m_rsumlevels = nrsumlevels;
1089 mp->m_rsumsize = nrsumsize;
1091 error = xfs_trans_commit(tp);
1097 * Free the fake mp structure.
1105 * Allocate an extent in the realtime subvolume, with the usual allocation
1106 * parameters. The length units are all in realtime extents, as is the
1107 * result block number.
1110 xfs_rtallocate_extent(
1111 xfs_trans_t *tp, /* transaction pointer */
1112 xfs_rtblock_t bno, /* starting block number to allocate */
1113 xfs_extlen_t minlen, /* minimum length to allocate */
1114 xfs_extlen_t maxlen, /* maximum length to allocate */
1115 xfs_extlen_t *len, /* out: actual length allocated */
1116 xfs_alloctype_t type, /* allocation type XFS_ALLOCTYPE... */
1117 int wasdel, /* was a delayed allocation extent */
1118 xfs_extlen_t prod, /* extent product factor */
1119 xfs_rtblock_t *rtblock) /* out: start block allocated */
1121 xfs_mount_t *mp = tp->t_mountp;
1122 int error; /* error value */
1123 xfs_rtblock_t r; /* result allocated block */
1124 xfs_fsblock_t sb; /* summary file block number */
1125 xfs_buf_t *sumbp; /* summary file block buffer */
1127 ASSERT(xfs_isilocked(mp->m_rbmip, XFS_ILOCK_EXCL));
1128 ASSERT(minlen > 0 && minlen <= maxlen);
1131 * If prod is set then figure out what to do to minlen and maxlen.
1136 if ((i = maxlen % prod))
1138 if ((i = minlen % prod))
1140 if (maxlen < minlen) {
1141 *rtblock = NULLRTBLOCK;
1148 * Allocate by size, or near another block, or exactly at some block.
1151 case XFS_ALLOCTYPE_ANY_AG:
1152 error = xfs_rtallocate_extent_size(mp, tp, minlen, maxlen, len,
1153 &sumbp, &sb, prod, &r);
1155 case XFS_ALLOCTYPE_NEAR_BNO:
1156 error = xfs_rtallocate_extent_near(mp, tp, bno, minlen, maxlen,
1157 len, &sumbp, &sb, prod, &r);
1159 case XFS_ALLOCTYPE_THIS_BNO:
1160 error = xfs_rtallocate_extent_exact(mp, tp, bno, minlen, maxlen,
1161 len, &sumbp, &sb, prod, &r);
1171 * If it worked, update the superblock.
1173 if (r != NULLRTBLOCK) {
1174 long slen = (long)*len;
1176 ASSERT(*len >= minlen && *len <= maxlen);
1178 xfs_trans_mod_sb(tp, XFS_TRANS_SB_RES_FREXTENTS, -slen);
1180 xfs_trans_mod_sb(tp, XFS_TRANS_SB_FREXTENTS, -slen);
1187 * Initialize realtime fields in the mount structure.
1191 struct xfs_mount *mp) /* file system mount structure */
1193 struct xfs_buf *bp; /* buffer for last block of subvolume */
1194 struct xfs_sb *sbp; /* filesystem superblock copy in mount */
1195 xfs_daddr_t d; /* address of last block of subvolume */
1199 if (sbp->sb_rblocks == 0)
1201 if (mp->m_rtdev_targp == NULL) {
1203 "Filesystem has a realtime volume, use rtdev=device option");
1206 mp->m_rsumlevels = sbp->sb_rextslog + 1;
1208 (uint)sizeof(xfs_suminfo_t) * mp->m_rsumlevels *
1210 mp->m_rsumsize = roundup(mp->m_rsumsize, sbp->sb_blocksize);
1211 mp->m_rbmip = mp->m_rsumip = NULL;
1213 * Check that the realtime section is an ok size.
1215 d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_rblocks);
1216 if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_rblocks) {
1217 xfs_warn(mp, "realtime mount -- %llu != %llu",
1218 (unsigned long long) XFS_BB_TO_FSB(mp, d),
1219 (unsigned long long) mp->m_sb.sb_rblocks);
1222 error = xfs_buf_read_uncached(mp->m_rtdev_targp,
1223 d - XFS_FSB_TO_BB(mp, 1),
1224 XFS_FSB_TO_BB(mp, 1), 0, &bp, NULL);
1226 xfs_warn(mp, "realtime device size check failed");
1234 * Get the bitmap and summary inodes into the mount structure
1239 xfs_mount_t *mp) /* file system mount structure */
1241 int error; /* error return value */
1245 error = xfs_iget(mp, NULL, sbp->sb_rbmino, 0, 0, &mp->m_rbmip);
1248 ASSERT(mp->m_rbmip != NULL);
1250 error = xfs_iget(mp, NULL, sbp->sb_rsumino, 0, 0, &mp->m_rsumip);
1255 ASSERT(mp->m_rsumip != NULL);
1260 xfs_rtunmount_inodes(
1261 struct xfs_mount *mp)
1266 IRELE(mp->m_rsumip);
1270 * Pick an extent for allocation at the start of a new realtime file.
1271 * Use the sequence number stored in the atime field of the bitmap inode.
1272 * Translate this to a fraction of the rtextents, and return the product
1273 * of rtextents and the fraction.
1274 * The fraction sequence is 0, 1/2, 1/4, 3/4, 1/8, ..., 7/8, 1/16, ...
1278 xfs_mount_t *mp, /* file system mount point */
1279 xfs_trans_t *tp, /* transaction pointer */
1280 xfs_extlen_t len, /* allocation length (rtextents) */
1281 xfs_rtblock_t *pick) /* result rt extent */
1283 xfs_rtblock_t b; /* result block */
1284 int log2; /* log of sequence number */
1285 __uint64_t resid; /* residual after log removed */
1286 __uint64_t seq; /* sequence number of file creation */
1287 __uint64_t *seqp; /* pointer to seqno in inode */
1289 ASSERT(xfs_isilocked(mp->m_rbmip, XFS_ILOCK_EXCL));
1291 seqp = (__uint64_t *)&mp->m_rbmip->i_d.di_atime;
1292 if (!(mp->m_rbmip->i_d.di_flags & XFS_DIFLAG_NEWRTBM)) {
1293 mp->m_rbmip->i_d.di_flags |= XFS_DIFLAG_NEWRTBM;
1297 if ((log2 = xfs_highbit64(seq)) == -1)
1300 resid = seq - (1ULL << log2);
1301 b = (mp->m_sb.sb_rextents * ((resid << 1) + 1ULL)) >>
1303 if (b >= mp->m_sb.sb_rextents)
1304 b = do_mod(b, mp->m_sb.sb_rextents);
1305 if (b + len > mp->m_sb.sb_rextents)
1306 b = mp->m_sb.sb_rextents - len;
1309 xfs_trans_log_inode(tp, mp->m_rbmip, XFS_ILOG_CORE);