2 * Copyright (c) 2000-2003,2005 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_defer.h"
27 #include "xfs_inode.h"
28 #include "xfs_trans.h"
29 #include "xfs_inode_item.h"
30 #include "xfs_alloc.h"
31 #include "xfs_btree.h"
32 #include "xfs_bmap_btree.h"
34 #include "xfs_error.h"
35 #include "xfs_quota.h"
36 #include "xfs_trace.h"
37 #include "xfs_cksum.h"
41 * Determine the extent state.
50 ASSERT(blks != 0); /* saved for DMIG */
51 return XFS_EXT_UNWRITTEN;
57 * Convert on-disk form of btree root to in-memory form.
62 xfs_bmdr_block_t *dblock,
64 struct xfs_btree_block *rblock,
67 struct xfs_mount *mp = ip->i_mount;
74 xfs_btree_init_block_int(mp, rblock, XFS_BUF_DADDR_NULL,
75 XFS_BTNUM_BMAP, 0, 0, ip->i_ino,
77 rblock->bb_level = dblock->bb_level;
78 ASSERT(be16_to_cpu(rblock->bb_level) > 0);
79 rblock->bb_numrecs = dblock->bb_numrecs;
80 dmxr = xfs_bmdr_maxrecs(dblocklen, 0);
81 fkp = XFS_BMDR_KEY_ADDR(dblock, 1);
82 tkp = XFS_BMBT_KEY_ADDR(mp, rblock, 1);
83 fpp = XFS_BMDR_PTR_ADDR(dblock, 1, dmxr);
84 tpp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, rblocklen);
85 dmxr = be16_to_cpu(dblock->bb_numrecs);
86 memcpy(tkp, fkp, sizeof(*fkp) * dmxr);
87 memcpy(tpp, fpp, sizeof(*fpp) * dmxr);
91 * Convert a compressed bmap extent record to an uncompressed form.
92 * This code must be in sync with the routines xfs_bmbt_get_startoff,
93 * xfs_bmbt_get_startblock, xfs_bmbt_get_blockcount and xfs_bmbt_get_state.
104 ext_flag = (int)(l0 >> (64 - BMBT_EXNTFLAG_BITLEN));
105 s->br_startoff = ((xfs_fileoff_t)l0 &
106 xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
107 s->br_startblock = (((xfs_fsblock_t)l0 & xfs_mask64lo(9)) << 43) |
108 (((xfs_fsblock_t)l1) >> 21);
109 s->br_blockcount = (xfs_filblks_t)(l1 & xfs_mask64lo(21));
110 /* This is xfs_extent_state() in-line */
112 ASSERT(s->br_blockcount != 0); /* saved for DMIG */
113 st = XFS_EXT_UNWRITTEN;
121 xfs_bmbt_rec_host_t *r,
124 __xfs_bmbt_get_all(r->l0, r->l1, s);
128 * Extract the blockcount field from an in memory bmap extent record.
131 xfs_bmbt_get_blockcount(
132 xfs_bmbt_rec_host_t *r)
134 return (xfs_filblks_t)(r->l1 & xfs_mask64lo(21));
138 * Extract the startblock field from an in memory bmap extent record.
141 xfs_bmbt_get_startblock(
142 xfs_bmbt_rec_host_t *r)
144 return (((xfs_fsblock_t)r->l0 & xfs_mask64lo(9)) << 43) |
145 (((xfs_fsblock_t)r->l1) >> 21);
149 * Extract the startoff field from an in memory bmap extent record.
152 xfs_bmbt_get_startoff(
153 xfs_bmbt_rec_host_t *r)
155 return ((xfs_fileoff_t)r->l0 &
156 xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
161 xfs_bmbt_rec_host_t *r)
165 ext_flag = (int)((r->l0) >> (64 - BMBT_EXNTFLAG_BITLEN));
166 return xfs_extent_state(xfs_bmbt_get_blockcount(r),
171 * Extract the blockcount field from an on disk bmap extent record.
174 xfs_bmbt_disk_get_blockcount(
177 return (xfs_filblks_t)(be64_to_cpu(r->l1) & xfs_mask64lo(21));
181 * Extract the startoff field from a disk format bmap extent record.
184 xfs_bmbt_disk_get_startoff(
187 return ((xfs_fileoff_t)be64_to_cpu(r->l0) &
188 xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN)) >> 9;
193 * Set all the fields in a bmap extent record from the arguments.
197 xfs_bmbt_rec_host_t *r,
198 xfs_fileoff_t startoff,
199 xfs_fsblock_t startblock,
200 xfs_filblks_t blockcount,
203 int extent_flag = (state == XFS_EXT_NORM) ? 0 : 1;
205 ASSERT(state == XFS_EXT_NORM || state == XFS_EXT_UNWRITTEN);
206 ASSERT((startoff & xfs_mask64hi(64-BMBT_STARTOFF_BITLEN)) == 0);
207 ASSERT((blockcount & xfs_mask64hi(64-BMBT_BLOCKCOUNT_BITLEN)) == 0);
209 ASSERT((startblock & xfs_mask64hi(64-BMBT_STARTBLOCK_BITLEN)) == 0);
211 r->l0 = ((xfs_bmbt_rec_base_t)extent_flag << 63) |
212 ((xfs_bmbt_rec_base_t)startoff << 9) |
213 ((xfs_bmbt_rec_base_t)startblock >> 43);
214 r->l1 = ((xfs_bmbt_rec_base_t)startblock << 21) |
215 ((xfs_bmbt_rec_base_t)blockcount &
216 (xfs_bmbt_rec_base_t)xfs_mask64lo(21));
220 * Set all the fields in a bmap extent record from the uncompressed form.
224 xfs_bmbt_rec_host_t *r,
227 xfs_bmbt_set_allf(r, s->br_startoff, s->br_startblock,
228 s->br_blockcount, s->br_state);
233 * Set all the fields in a disk format bmap extent record from the arguments.
236 xfs_bmbt_disk_set_allf(
238 xfs_fileoff_t startoff,
239 xfs_fsblock_t startblock,
240 xfs_filblks_t blockcount,
243 int extent_flag = (state == XFS_EXT_NORM) ? 0 : 1;
245 ASSERT(state == XFS_EXT_NORM || state == XFS_EXT_UNWRITTEN);
246 ASSERT((startoff & xfs_mask64hi(64-BMBT_STARTOFF_BITLEN)) == 0);
247 ASSERT((blockcount & xfs_mask64hi(64-BMBT_BLOCKCOUNT_BITLEN)) == 0);
248 ASSERT((startblock & xfs_mask64hi(64-BMBT_STARTBLOCK_BITLEN)) == 0);
251 ((xfs_bmbt_rec_base_t)extent_flag << 63) |
252 ((xfs_bmbt_rec_base_t)startoff << 9) |
253 ((xfs_bmbt_rec_base_t)startblock >> 43));
255 ((xfs_bmbt_rec_base_t)startblock << 21) |
256 ((xfs_bmbt_rec_base_t)blockcount &
257 (xfs_bmbt_rec_base_t)xfs_mask64lo(21)));
261 * Set all the fields in a bmap extent record from the uncompressed form.
264 xfs_bmbt_disk_set_all(
268 xfs_bmbt_disk_set_allf(r, s->br_startoff, s->br_startblock,
269 s->br_blockcount, s->br_state);
273 * Set the blockcount field in a bmap extent record.
276 xfs_bmbt_set_blockcount(
277 xfs_bmbt_rec_host_t *r,
280 ASSERT((v & xfs_mask64hi(43)) == 0);
281 r->l1 = (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64hi(43)) |
282 (xfs_bmbt_rec_base_t)(v & xfs_mask64lo(21));
286 * Set the startblock field in a bmap extent record.
289 xfs_bmbt_set_startblock(
290 xfs_bmbt_rec_host_t *r,
293 ASSERT((v & xfs_mask64hi(12)) == 0);
294 r->l0 = (r->l0 & (xfs_bmbt_rec_base_t)xfs_mask64hi(55)) |
295 (xfs_bmbt_rec_base_t)(v >> 43);
296 r->l1 = (r->l1 & (xfs_bmbt_rec_base_t)xfs_mask64lo(21)) |
297 (xfs_bmbt_rec_base_t)(v << 21);
301 * Set the startoff field in a bmap extent record.
304 xfs_bmbt_set_startoff(
305 xfs_bmbt_rec_host_t *r,
308 ASSERT((v & xfs_mask64hi(9)) == 0);
309 r->l0 = (r->l0 & (xfs_bmbt_rec_base_t) xfs_mask64hi(1)) |
310 ((xfs_bmbt_rec_base_t)v << 9) |
311 (r->l0 & (xfs_bmbt_rec_base_t)xfs_mask64lo(9));
315 * Set the extent state field in a bmap extent record.
319 xfs_bmbt_rec_host_t *r,
322 ASSERT(v == XFS_EXT_NORM || v == XFS_EXT_UNWRITTEN);
323 if (v == XFS_EXT_NORM)
324 r->l0 &= xfs_mask64lo(64 - BMBT_EXNTFLAG_BITLEN);
326 r->l0 |= xfs_mask64hi(BMBT_EXNTFLAG_BITLEN);
330 * Convert in-memory form of btree root to on-disk form.
334 struct xfs_mount *mp,
335 struct xfs_btree_block *rblock,
337 xfs_bmdr_block_t *dblock,
346 if (xfs_sb_version_hascrc(&mp->m_sb)) {
347 ASSERT(rblock->bb_magic == cpu_to_be32(XFS_BMAP_CRC_MAGIC));
348 ASSERT(uuid_equal(&rblock->bb_u.l.bb_uuid,
349 &mp->m_sb.sb_meta_uuid));
350 ASSERT(rblock->bb_u.l.bb_blkno ==
351 cpu_to_be64(XFS_BUF_DADDR_NULL));
353 ASSERT(rblock->bb_magic == cpu_to_be32(XFS_BMAP_MAGIC));
354 ASSERT(rblock->bb_u.l.bb_leftsib == cpu_to_be64(NULLFSBLOCK));
355 ASSERT(rblock->bb_u.l.bb_rightsib == cpu_to_be64(NULLFSBLOCK));
356 ASSERT(rblock->bb_level != 0);
357 dblock->bb_level = rblock->bb_level;
358 dblock->bb_numrecs = rblock->bb_numrecs;
359 dmxr = xfs_bmdr_maxrecs(dblocklen, 0);
360 fkp = XFS_BMBT_KEY_ADDR(mp, rblock, 1);
361 tkp = XFS_BMDR_KEY_ADDR(dblock, 1);
362 fpp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, rblocklen);
363 tpp = XFS_BMDR_PTR_ADDR(dblock, 1, dmxr);
364 dmxr = be16_to_cpu(dblock->bb_numrecs);
365 memcpy(tkp, fkp, sizeof(*fkp) * dmxr);
366 memcpy(tpp, fpp, sizeof(*fpp) * dmxr);
370 * Check extent records, which have just been read, for
371 * any bit in the extent flag field. ASSERT on debug
372 * kernels, as this condition should not occur.
373 * Return an error condition (1) if any flags found,
374 * otherwise return 0.
378 xfs_check_nostate_extents(
383 for (; num > 0; num--, idx++) {
384 xfs_bmbt_rec_host_t *ep = xfs_iext_get_ext(ifp, idx);
386 (64 - BMBT_EXNTFLAG_BITLEN)) != 0) {
395 STATIC struct xfs_btree_cur *
397 struct xfs_btree_cur *cur)
399 struct xfs_btree_cur *new;
401 new = xfs_bmbt_init_cursor(cur->bc_mp, cur->bc_tp,
402 cur->bc_private.b.ip, cur->bc_private.b.whichfork);
405 * Copy the firstblock, dfops, and flags values,
406 * since init cursor doesn't get them.
408 new->bc_private.b.firstblock = cur->bc_private.b.firstblock;
409 new->bc_private.b.dfops = cur->bc_private.b.dfops;
410 new->bc_private.b.flags = cur->bc_private.b.flags;
416 xfs_bmbt_update_cursor(
417 struct xfs_btree_cur *src,
418 struct xfs_btree_cur *dst)
420 ASSERT((dst->bc_private.b.firstblock != NULLFSBLOCK) ||
421 (dst->bc_private.b.ip->i_d.di_flags & XFS_DIFLAG_REALTIME));
422 ASSERT(dst->bc_private.b.dfops == src->bc_private.b.dfops);
424 dst->bc_private.b.allocated += src->bc_private.b.allocated;
425 dst->bc_private.b.firstblock = src->bc_private.b.firstblock;
427 src->bc_private.b.allocated = 0;
431 xfs_bmbt_alloc_block(
432 struct xfs_btree_cur *cur,
433 union xfs_btree_ptr *start,
434 union xfs_btree_ptr *new,
437 xfs_alloc_arg_t args; /* block allocation args */
438 int error; /* error return value */
440 memset(&args, 0, sizeof(args));
441 args.tp = cur->bc_tp;
442 args.mp = cur->bc_mp;
443 args.fsbno = cur->bc_private.b.firstblock;
444 args.firstblock = args.fsbno;
445 xfs_rmap_ino_bmbt_owner(&args.oinfo, cur->bc_private.b.ip->i_ino,
446 cur->bc_private.b.whichfork);
448 if (args.fsbno == NULLFSBLOCK) {
449 args.fsbno = be64_to_cpu(start->l);
450 args.type = XFS_ALLOCTYPE_START_BNO;
452 * Make sure there is sufficient room left in the AG to
453 * complete a full tree split for an extent insert. If
454 * we are converting the middle part of an extent then
455 * we may need space for two tree splits.
457 * We are relying on the caller to make the correct block
458 * reservation for this operation to succeed. If the
459 * reservation amount is insufficient then we may fail a
460 * block allocation here and corrupt the filesystem.
462 args.minleft = args.tp->t_blk_res;
463 } else if (cur->bc_private.b.dfops->dop_low) {
464 args.type = XFS_ALLOCTYPE_START_BNO;
466 args.type = XFS_ALLOCTYPE_NEAR_BNO;
469 args.minlen = args.maxlen = args.prod = 1;
470 args.wasdel = cur->bc_private.b.flags & XFS_BTCUR_BPRV_WASDEL;
471 if (!args.wasdel && args.tp->t_blk_res == 0) {
475 error = xfs_alloc_vextent(&args);
479 if (args.fsbno == NULLFSBLOCK && args.minleft) {
481 * Could not find an AG with enough free space to satisfy
482 * a full btree split. Try again and if
483 * successful activate the lowspace algorithm.
486 args.type = XFS_ALLOCTYPE_FIRST_AG;
487 error = xfs_alloc_vextent(&args);
490 cur->bc_private.b.dfops->dop_low = true;
492 if (WARN_ON_ONCE(args.fsbno == NULLFSBLOCK)) {
493 XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
497 ASSERT(args.len == 1);
498 cur->bc_private.b.firstblock = args.fsbno;
499 cur->bc_private.b.allocated++;
500 cur->bc_private.b.ip->i_d.di_nblocks++;
501 xfs_trans_log_inode(args.tp, cur->bc_private.b.ip, XFS_ILOG_CORE);
502 xfs_trans_mod_dquot_byino(args.tp, cur->bc_private.b.ip,
503 XFS_TRANS_DQ_BCOUNT, 1L);
505 new->l = cpu_to_be64(args.fsbno);
507 XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
512 XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
518 struct xfs_btree_cur *cur,
521 struct xfs_mount *mp = cur->bc_mp;
522 struct xfs_inode *ip = cur->bc_private.b.ip;
523 struct xfs_trans *tp = cur->bc_tp;
524 xfs_fsblock_t fsbno = XFS_DADDR_TO_FSB(mp, XFS_BUF_ADDR(bp));
525 struct xfs_owner_info oinfo;
527 xfs_rmap_ino_bmbt_owner(&oinfo, ip->i_ino, cur->bc_private.b.whichfork);
528 xfs_bmap_add_free(mp, cur->bc_private.b.dfops, fsbno, 1, &oinfo);
529 ip->i_d.di_nblocks--;
531 xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
532 xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
537 xfs_bmbt_get_minrecs(
538 struct xfs_btree_cur *cur,
541 if (level == cur->bc_nlevels - 1) {
542 struct xfs_ifork *ifp;
544 ifp = XFS_IFORK_PTR(cur->bc_private.b.ip,
545 cur->bc_private.b.whichfork);
547 return xfs_bmbt_maxrecs(cur->bc_mp,
548 ifp->if_broot_bytes, level == 0) / 2;
551 return cur->bc_mp->m_bmap_dmnr[level != 0];
555 xfs_bmbt_get_maxrecs(
556 struct xfs_btree_cur *cur,
559 if (level == cur->bc_nlevels - 1) {
560 struct xfs_ifork *ifp;
562 ifp = XFS_IFORK_PTR(cur->bc_private.b.ip,
563 cur->bc_private.b.whichfork);
565 return xfs_bmbt_maxrecs(cur->bc_mp,
566 ifp->if_broot_bytes, level == 0);
569 return cur->bc_mp->m_bmap_dmxr[level != 0];
574 * Get the maximum records we could store in the on-disk format.
576 * For non-root nodes this is equivalent to xfs_bmbt_get_maxrecs, but
577 * for the root node this checks the available space in the dinode fork
578 * so that we can resize the in-memory buffer to match it. After a
579 * resize to the maximum size this function returns the same value
580 * as xfs_bmbt_get_maxrecs for the root node, too.
583 xfs_bmbt_get_dmaxrecs(
584 struct xfs_btree_cur *cur,
587 if (level != cur->bc_nlevels - 1)
588 return cur->bc_mp->m_bmap_dmxr[level != 0];
589 return xfs_bmdr_maxrecs(cur->bc_private.b.forksize, level == 0);
593 xfs_bmbt_init_key_from_rec(
594 union xfs_btree_key *key,
595 union xfs_btree_rec *rec)
597 key->bmbt.br_startoff =
598 cpu_to_be64(xfs_bmbt_disk_get_startoff(&rec->bmbt));
602 xfs_bmbt_init_rec_from_cur(
603 struct xfs_btree_cur *cur,
604 union xfs_btree_rec *rec)
606 xfs_bmbt_disk_set_all(&rec->bmbt, &cur->bc_rec.b);
610 xfs_bmbt_init_ptr_from_cur(
611 struct xfs_btree_cur *cur,
612 union xfs_btree_ptr *ptr)
619 struct xfs_btree_cur *cur,
620 union xfs_btree_key *key)
622 return (__int64_t)be64_to_cpu(key->bmbt.br_startoff) -
623 cur->bc_rec.b.br_startoff;
630 struct xfs_mount *mp = bp->b_target->bt_mount;
631 struct xfs_btree_block *block = XFS_BUF_TO_BLOCK(bp);
634 switch (block->bb_magic) {
635 case cpu_to_be32(XFS_BMAP_CRC_MAGIC):
636 if (!xfs_sb_version_hascrc(&mp->m_sb))
638 if (!uuid_equal(&block->bb_u.l.bb_uuid, &mp->m_sb.sb_meta_uuid))
640 if (be64_to_cpu(block->bb_u.l.bb_blkno) != bp->b_bn)
643 * XXX: need a better way of verifying the owner here. Right now
644 * just make sure there has been one set.
646 if (be64_to_cpu(block->bb_u.l.bb_owner) == 0)
649 case cpu_to_be32(XFS_BMAP_MAGIC):
656 * numrecs and level verification.
658 * We don't know what fork we belong to, so just verify that the level
659 * is less than the maximum of the two. Later checks will be more
662 level = be16_to_cpu(block->bb_level);
663 if (level > max(mp->m_bm_maxlevels[0], mp->m_bm_maxlevels[1]))
665 if (be16_to_cpu(block->bb_numrecs) > mp->m_bmap_dmxr[level != 0])
668 /* sibling pointer verification */
669 if (!block->bb_u.l.bb_leftsib ||
670 (block->bb_u.l.bb_leftsib != cpu_to_be64(NULLFSBLOCK) &&
671 !XFS_FSB_SANITY_CHECK(mp, be64_to_cpu(block->bb_u.l.bb_leftsib))))
673 if (!block->bb_u.l.bb_rightsib ||
674 (block->bb_u.l.bb_rightsib != cpu_to_be64(NULLFSBLOCK) &&
675 !XFS_FSB_SANITY_CHECK(mp, be64_to_cpu(block->bb_u.l.bb_rightsib))))
682 xfs_bmbt_read_verify(
685 if (!xfs_btree_lblock_verify_crc(bp))
686 xfs_buf_ioerror(bp, -EFSBADCRC);
687 else if (!xfs_bmbt_verify(bp))
688 xfs_buf_ioerror(bp, -EFSCORRUPTED);
691 trace_xfs_btree_corrupt(bp, _RET_IP_);
692 xfs_verifier_error(bp);
697 xfs_bmbt_write_verify(
700 if (!xfs_bmbt_verify(bp)) {
701 trace_xfs_btree_corrupt(bp, _RET_IP_);
702 xfs_buf_ioerror(bp, -EFSCORRUPTED);
703 xfs_verifier_error(bp);
706 xfs_btree_lblock_calc_crc(bp);
709 const struct xfs_buf_ops xfs_bmbt_buf_ops = {
711 .verify_read = xfs_bmbt_read_verify,
712 .verify_write = xfs_bmbt_write_verify,
716 #if defined(DEBUG) || defined(XFS_WARN)
718 xfs_bmbt_keys_inorder(
719 struct xfs_btree_cur *cur,
720 union xfs_btree_key *k1,
721 union xfs_btree_key *k2)
723 return be64_to_cpu(k1->bmbt.br_startoff) <
724 be64_to_cpu(k2->bmbt.br_startoff);
728 xfs_bmbt_recs_inorder(
729 struct xfs_btree_cur *cur,
730 union xfs_btree_rec *r1,
731 union xfs_btree_rec *r2)
733 return xfs_bmbt_disk_get_startoff(&r1->bmbt) +
734 xfs_bmbt_disk_get_blockcount(&r1->bmbt) <=
735 xfs_bmbt_disk_get_startoff(&r2->bmbt);
739 static const struct xfs_btree_ops xfs_bmbt_ops = {
740 .rec_len = sizeof(xfs_bmbt_rec_t),
741 .key_len = sizeof(xfs_bmbt_key_t),
743 .dup_cursor = xfs_bmbt_dup_cursor,
744 .update_cursor = xfs_bmbt_update_cursor,
745 .alloc_block = xfs_bmbt_alloc_block,
746 .free_block = xfs_bmbt_free_block,
747 .get_maxrecs = xfs_bmbt_get_maxrecs,
748 .get_minrecs = xfs_bmbt_get_minrecs,
749 .get_dmaxrecs = xfs_bmbt_get_dmaxrecs,
750 .init_key_from_rec = xfs_bmbt_init_key_from_rec,
751 .init_rec_from_cur = xfs_bmbt_init_rec_from_cur,
752 .init_ptr_from_cur = xfs_bmbt_init_ptr_from_cur,
753 .key_diff = xfs_bmbt_key_diff,
754 .buf_ops = &xfs_bmbt_buf_ops,
755 #if defined(DEBUG) || defined(XFS_WARN)
756 .keys_inorder = xfs_bmbt_keys_inorder,
757 .recs_inorder = xfs_bmbt_recs_inorder,
762 * Allocate a new bmap btree cursor.
764 struct xfs_btree_cur * /* new bmap btree cursor */
765 xfs_bmbt_init_cursor(
766 struct xfs_mount *mp, /* file system mount point */
767 struct xfs_trans *tp, /* transaction pointer */
768 struct xfs_inode *ip, /* inode owning the btree */
769 int whichfork) /* data or attr fork */
771 struct xfs_ifork *ifp = XFS_IFORK_PTR(ip, whichfork);
772 struct xfs_btree_cur *cur;
773 ASSERT(whichfork != XFS_COW_FORK);
775 cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_NOFS);
779 cur->bc_nlevels = be16_to_cpu(ifp->if_broot->bb_level) + 1;
780 cur->bc_btnum = XFS_BTNUM_BMAP;
781 cur->bc_blocklog = mp->m_sb.sb_blocklog;
782 cur->bc_statoff = XFS_STATS_CALC_INDEX(xs_bmbt_2);
784 cur->bc_ops = &xfs_bmbt_ops;
785 cur->bc_flags = XFS_BTREE_LONG_PTRS | XFS_BTREE_ROOT_IN_INODE;
786 if (xfs_sb_version_hascrc(&mp->m_sb))
787 cur->bc_flags |= XFS_BTREE_CRC_BLOCKS;
789 cur->bc_private.b.forksize = XFS_IFORK_SIZE(ip, whichfork);
790 cur->bc_private.b.ip = ip;
791 cur->bc_private.b.firstblock = NULLFSBLOCK;
792 cur->bc_private.b.dfops = NULL;
793 cur->bc_private.b.allocated = 0;
794 cur->bc_private.b.flags = 0;
795 cur->bc_private.b.whichfork = whichfork;
801 * Calculate number of records in a bmap btree block.
805 struct xfs_mount *mp,
809 blocklen -= XFS_BMBT_BLOCK_LEN(mp);
812 return blocklen / sizeof(xfs_bmbt_rec_t);
813 return blocklen / (sizeof(xfs_bmbt_key_t) + sizeof(xfs_bmbt_ptr_t));
817 * Calculate number of records in a bmap btree inode root.
824 blocklen -= sizeof(xfs_bmdr_block_t);
827 return blocklen / sizeof(xfs_bmdr_rec_t);
828 return blocklen / (sizeof(xfs_bmdr_key_t) + sizeof(xfs_bmdr_ptr_t));
832 * Change the owner of a btree format fork fo the inode passed in. Change it to
833 * the owner of that is passed in so that we can change owners before or after
834 * we switch forks between inodes. The operation that the caller is doing will
835 * determine whether is needs to change owner before or after the switch.
837 * For demand paged transactional modification, the fork switch should be done
838 * after reading in all the blocks, modifying them and pinning them in the
839 * transaction. For modification when the buffers are already pinned in memory,
840 * the fork switch can be done before changing the owner as we won't need to
841 * validate the owner until the btree buffers are unpinned and writes can occur
844 * For recovery based ownership change, there is no transactional context and
845 * so a buffer list must be supplied so that we can record the buffers that we
846 * modified for the caller to issue IO on.
849 xfs_bmbt_change_owner(
850 struct xfs_trans *tp,
851 struct xfs_inode *ip,
854 struct list_head *buffer_list)
856 struct xfs_btree_cur *cur;
859 ASSERT(tp || buffer_list);
860 ASSERT(!(tp && buffer_list));
861 if (whichfork == XFS_DATA_FORK)
862 ASSERT(ip->i_d.di_format == XFS_DINODE_FMT_BTREE);
864 ASSERT(ip->i_d.di_aformat == XFS_DINODE_FMT_BTREE);
866 cur = xfs_bmbt_init_cursor(ip->i_mount, tp, ip, whichfork);
870 error = xfs_btree_change_owner(cur, new_owner, buffer_list);
871 xfs_btree_del_cursor(cur, error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);