2 * Copyright (c) 2000-2001,2005 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_types.h"
24 #include "xfs_trans.h"
28 #include "xfs_dmapi.h"
29 #include "xfs_mount.h"
30 #include "xfs_bmap_btree.h"
31 #include "xfs_alloc_btree.h"
32 #include "xfs_ialloc_btree.h"
33 #include "xfs_dir2_sf.h"
34 #include "xfs_attr_sf.h"
35 #include "xfs_dinode.h"
36 #include "xfs_inode.h"
37 #include "xfs_btree.h"
38 #include "xfs_btree_trace.h"
39 #include "xfs_ialloc.h"
40 #include "xfs_alloc.h"
41 #include "xfs_error.h"
44 * Prototypes for internal functions.
47 STATIC void xfs_alloc_log_block(xfs_trans_t *, xfs_buf_t *, int);
48 STATIC void xfs_alloc_log_keys(xfs_btree_cur_t *, xfs_buf_t *, int, int);
49 STATIC void xfs_alloc_log_ptrs(xfs_btree_cur_t *, xfs_buf_t *, int, int);
50 STATIC void xfs_alloc_log_recs(xfs_btree_cur_t *, xfs_buf_t *, int, int);
57 * Single level of the xfs_alloc_delete record deletion routine.
58 * Delete record pointed to by cur/level.
59 * Remove the record from its block then rebalance the tree.
60 * Return 0 for error, 1 for done, 2 to go on to the next level.
62 STATIC int /* error */
64 xfs_btree_cur_t *cur, /* btree cursor */
65 int level, /* level removing record from */
66 int *stat) /* fail/done/go-on */
68 xfs_agf_t *agf; /* allocation group freelist header */
69 xfs_alloc_block_t *block; /* btree block record/key lives in */
70 xfs_agblock_t bno; /* btree block number */
71 xfs_buf_t *bp; /* buffer for block */
72 int error; /* error return value */
73 int i; /* loop index */
74 xfs_alloc_key_t key; /* kp points here if block is level 0 */
75 xfs_agblock_t lbno; /* left block's block number */
76 xfs_buf_t *lbp; /* left block's buffer pointer */
77 xfs_alloc_block_t *left; /* left btree block */
78 xfs_alloc_key_t *lkp=NULL; /* left block key pointer */
79 xfs_alloc_ptr_t *lpp=NULL; /* left block address pointer */
80 int lrecs=0; /* number of records in left block */
81 xfs_alloc_rec_t *lrp; /* left block record pointer */
82 xfs_mount_t *mp; /* mount structure */
83 int ptr; /* index in btree block for this rec */
84 xfs_agblock_t rbno; /* right block's block number */
85 xfs_buf_t *rbp; /* right block's buffer pointer */
86 xfs_alloc_block_t *right; /* right btree block */
87 xfs_alloc_key_t *rkp; /* right block key pointer */
88 xfs_alloc_ptr_t *rpp; /* right block address pointer */
89 int rrecs=0; /* number of records in right block */
91 xfs_alloc_rec_t *rrp; /* right block record pointer */
92 xfs_btree_cur_t *tcur; /* temporary btree cursor */
95 * Get the index of the entry being deleted, check for nothing there.
97 ptr = cur->bc_ptrs[level];
103 * Get the buffer & block containing the record or key/ptr.
105 bp = cur->bc_bufs[level];
106 block = XFS_BUF_TO_ALLOC_BLOCK(bp);
108 if ((error = xfs_btree_check_sblock(cur, block, level, bp)))
112 * Fail if we're off the end of the block.
114 numrecs = be16_to_cpu(block->bb_numrecs);
119 XFS_STATS_INC(xs_abt_delrec);
121 * It's a nonleaf. Excise the key and ptr being deleted, by
122 * sliding the entries past them down one.
123 * Log the changed areas of the block.
126 lkp = XFS_ALLOC_KEY_ADDR(block, 1, cur);
127 lpp = XFS_ALLOC_PTR_ADDR(block, 1, cur);
129 for (i = ptr; i < numrecs; i++) {
130 if ((error = xfs_btree_check_sptr(cur, be32_to_cpu(lpp[i]), level)))
135 memmove(&lkp[ptr - 1], &lkp[ptr],
136 (numrecs - ptr) * sizeof(*lkp));
137 memmove(&lpp[ptr - 1], &lpp[ptr],
138 (numrecs - ptr) * sizeof(*lpp));
139 xfs_alloc_log_ptrs(cur, bp, ptr, numrecs - 1);
140 xfs_alloc_log_keys(cur, bp, ptr, numrecs - 1);
144 * It's a leaf. Excise the record being deleted, by sliding the
145 * entries past it down one. Log the changed areas of the block.
148 lrp = XFS_ALLOC_REC_ADDR(block, 1, cur);
150 memmove(&lrp[ptr - 1], &lrp[ptr],
151 (numrecs - ptr) * sizeof(*lrp));
152 xfs_alloc_log_recs(cur, bp, ptr, numrecs - 1);
155 * If it's the first record in the block, we'll need a key
156 * structure to pass up to the next level (updkey).
159 key.ar_startblock = lrp->ar_startblock;
160 key.ar_blockcount = lrp->ar_blockcount;
165 * Decrement and log the number of entries in the block.
168 block->bb_numrecs = cpu_to_be16(numrecs);
169 xfs_alloc_log_block(cur->bc_tp, bp, XFS_BB_NUMRECS);
171 * See if the longest free extent in the allocation group was
172 * changed by this operation. True if it's the by-size btree, and
173 * this is the leaf level, and there is no right sibling block,
174 * and this was the last record.
176 agf = XFS_BUF_TO_AGF(cur->bc_private.a.agbp);
180 cur->bc_btnum == XFS_BTNUM_CNT &&
181 be32_to_cpu(block->bb_rightsib) == NULLAGBLOCK &&
183 ASSERT(ptr == numrecs + 1);
185 * There are still records in the block. Grab the size
189 rrp = XFS_ALLOC_REC_ADDR(block, numrecs, cur);
190 agf->agf_longest = rrp->ar_blockcount;
193 * No free extents left.
196 agf->agf_longest = 0;
197 mp->m_perag[be32_to_cpu(agf->agf_seqno)].pagf_longest =
198 be32_to_cpu(agf->agf_longest);
199 xfs_alloc_log_agf(cur->bc_tp, cur->bc_private.a.agbp,
203 * Is this the root level? If so, we're almost done.
205 if (level == cur->bc_nlevels - 1) {
207 * If this is the root level,
208 * and there's only one entry left,
209 * and it's NOT the leaf level,
210 * then we can get rid of this level.
212 if (numrecs == 1 && level > 0) {
214 * lpp is still set to the first pointer in the block.
215 * Make it the new root of the btree.
217 bno = be32_to_cpu(agf->agf_roots[cur->bc_btnum]);
218 agf->agf_roots[cur->bc_btnum] = *lpp;
219 be32_add_cpu(&agf->agf_levels[cur->bc_btnum], -1);
220 mp->m_perag[be32_to_cpu(agf->agf_seqno)].pagf_levels[cur->bc_btnum]--;
222 * Put this buffer/block on the ag's freelist.
224 error = xfs_alloc_put_freelist(cur->bc_tp,
225 cur->bc_private.a.agbp, NULL, bno, 1);
229 * Since blocks move to the free list without the
230 * coordination used in xfs_bmap_finish, we can't allow
231 * block to be available for reallocation and
232 * non-transaction writing (user data) until we know
233 * that the transaction that moved it to the free list
234 * is permanently on disk. We track the blocks by
235 * declaring these blocks as "busy"; the busy list is
236 * maintained on a per-ag basis and each transaction
237 * records which entries should be removed when the
238 * iclog commits to disk. If a busy block is
239 * allocated, the iclog is pushed up to the LSN
240 * that freed the block.
242 xfs_alloc_mark_busy(cur->bc_tp,
243 be32_to_cpu(agf->agf_seqno), bno, 1);
245 xfs_trans_agbtree_delta(cur->bc_tp, -1);
246 xfs_alloc_log_agf(cur->bc_tp, cur->bc_private.a.agbp,
247 XFS_AGF_ROOTS | XFS_AGF_LEVELS);
249 * Update the cursor so there's one fewer level.
251 xfs_btree_setbuf(cur, level, NULL);
253 } else if (level > 0 &&
254 (error = xfs_btree_decrement(cur, level, &i)))
260 * If we deleted the leftmost entry in the block, update the
261 * key values above us in the tree.
263 if (ptr == 1 && (error = xfs_btree_updkey(cur, (union xfs_btree_key *)lkp, level + 1)))
266 * If the number of records remaining in the block is at least
267 * the minimum, we're done.
269 if (numrecs >= XFS_ALLOC_BLOCK_MINRECS(level, cur)) {
270 if (level > 0 && (error = xfs_btree_decrement(cur, level, &i)))
276 * Otherwise, we have to move some records around to keep the
277 * tree balanced. Look at the left and right sibling blocks to
278 * see if we can re-balance by moving only one record.
280 rbno = be32_to_cpu(block->bb_rightsib);
281 lbno = be32_to_cpu(block->bb_leftsib);
283 ASSERT(rbno != NULLAGBLOCK || lbno != NULLAGBLOCK);
285 * Duplicate the cursor so our btree manipulations here won't
286 * disrupt the next level up.
288 if ((error = xfs_btree_dup_cursor(cur, &tcur)))
291 * If there's a right sibling, see if it's ok to shift an entry
294 if (rbno != NULLAGBLOCK) {
296 * Move the temp cursor to the last entry in the next block.
297 * Actually any entry but the first would suffice.
299 i = xfs_btree_lastrec(tcur, level);
300 XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
301 if ((error = xfs_btree_increment(tcur, level, &i)))
303 XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
304 i = xfs_btree_lastrec(tcur, level);
305 XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
307 * Grab a pointer to the block.
309 rbp = tcur->bc_bufs[level];
310 right = XFS_BUF_TO_ALLOC_BLOCK(rbp);
312 if ((error = xfs_btree_check_sblock(cur, right, level, rbp)))
316 * Grab the current block number, for future use.
318 bno = be32_to_cpu(right->bb_leftsib);
320 * If right block is full enough so that removing one entry
321 * won't make it too empty, and left-shifting an entry out
322 * of right to us works, we're done.
324 if (be16_to_cpu(right->bb_numrecs) - 1 >=
325 XFS_ALLOC_BLOCK_MINRECS(level, cur)) {
326 if ((error = xfs_btree_lshift(tcur, level, &i)))
329 ASSERT(be16_to_cpu(block->bb_numrecs) >=
330 XFS_ALLOC_BLOCK_MINRECS(level, cur));
331 xfs_btree_del_cursor(tcur,
334 (error = xfs_btree_decrement(cur, level,
342 * Otherwise, grab the number of records in right for
343 * future reference, and fix up the temp cursor to point
344 * to our block again (last record).
346 rrecs = be16_to_cpu(right->bb_numrecs);
347 if (lbno != NULLAGBLOCK) {
348 i = xfs_btree_firstrec(tcur, level);
349 XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
350 if ((error = xfs_btree_decrement(tcur, level, &i)))
352 XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
356 * If there's a left sibling, see if it's ok to shift an entry
359 if (lbno != NULLAGBLOCK) {
361 * Move the temp cursor to the first entry in the
364 i = xfs_btree_firstrec(tcur, level);
365 XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
366 if ((error = xfs_btree_decrement(tcur, level, &i)))
368 XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
369 xfs_btree_firstrec(tcur, level);
371 * Grab a pointer to the block.
373 lbp = tcur->bc_bufs[level];
374 left = XFS_BUF_TO_ALLOC_BLOCK(lbp);
376 if ((error = xfs_btree_check_sblock(cur, left, level, lbp)))
380 * Grab the current block number, for future use.
382 bno = be32_to_cpu(left->bb_rightsib);
384 * If left block is full enough so that removing one entry
385 * won't make it too empty, and right-shifting an entry out
386 * of left to us works, we're done.
388 if (be16_to_cpu(left->bb_numrecs) - 1 >=
389 XFS_ALLOC_BLOCK_MINRECS(level, cur)) {
390 if ((error = xfs_btree_rshift(tcur, level, &i)))
393 ASSERT(be16_to_cpu(block->bb_numrecs) >=
394 XFS_ALLOC_BLOCK_MINRECS(level, cur));
395 xfs_btree_del_cursor(tcur,
404 * Otherwise, grab the number of records in right for
407 lrecs = be16_to_cpu(left->bb_numrecs);
410 * Delete the temp cursor, we're done with it.
412 xfs_btree_del_cursor(tcur, XFS_BTREE_NOERROR);
414 * If here, we need to do a join to keep the tree balanced.
416 ASSERT(bno != NULLAGBLOCK);
418 * See if we can join with the left neighbor block.
420 if (lbno != NULLAGBLOCK &&
421 lrecs + numrecs <= XFS_ALLOC_BLOCK_MAXRECS(level, cur)) {
423 * Set "right" to be the starting block,
424 * "left" to be the left neighbor.
428 rrecs = be16_to_cpu(right->bb_numrecs);
430 if ((error = xfs_btree_read_bufs(mp, cur->bc_tp,
431 cur->bc_private.a.agno, lbno, 0, &lbp,
432 XFS_ALLOC_BTREE_REF)))
434 left = XFS_BUF_TO_ALLOC_BLOCK(lbp);
435 lrecs = be16_to_cpu(left->bb_numrecs);
436 if ((error = xfs_btree_check_sblock(cur, left, level, lbp)))
440 * If that won't work, see if we can join with the right neighbor block.
442 else if (rbno != NULLAGBLOCK &&
443 rrecs + numrecs <= XFS_ALLOC_BLOCK_MAXRECS(level, cur)) {
445 * Set "left" to be the starting block,
446 * "right" to be the right neighbor.
450 lrecs = be16_to_cpu(left->bb_numrecs);
452 if ((error = xfs_btree_read_bufs(mp, cur->bc_tp,
453 cur->bc_private.a.agno, rbno, 0, &rbp,
454 XFS_ALLOC_BTREE_REF)))
456 right = XFS_BUF_TO_ALLOC_BLOCK(rbp);
457 rrecs = be16_to_cpu(right->bb_numrecs);
458 if ((error = xfs_btree_check_sblock(cur, right, level, rbp)))
462 * Otherwise, we can't fix the imbalance.
463 * Just return. This is probably a logic error, but it's not fatal.
466 if (level > 0 && (error = xfs_btree_decrement(cur, level, &i)))
472 * We're now going to join "left" and "right" by moving all the stuff
473 * in "right" to "left" and deleting "right".
477 * It's a non-leaf. Move keys and pointers.
479 lkp = XFS_ALLOC_KEY_ADDR(left, lrecs + 1, cur);
480 lpp = XFS_ALLOC_PTR_ADDR(left, lrecs + 1, cur);
481 rkp = XFS_ALLOC_KEY_ADDR(right, 1, cur);
482 rpp = XFS_ALLOC_PTR_ADDR(right, 1, cur);
484 for (i = 0; i < rrecs; i++) {
485 if ((error = xfs_btree_check_sptr(cur, be32_to_cpu(rpp[i]), level)))
489 memcpy(lkp, rkp, rrecs * sizeof(*lkp));
490 memcpy(lpp, rpp, rrecs * sizeof(*lpp));
491 xfs_alloc_log_keys(cur, lbp, lrecs + 1, lrecs + rrecs);
492 xfs_alloc_log_ptrs(cur, lbp, lrecs + 1, lrecs + rrecs);
495 * It's a leaf. Move records.
497 lrp = XFS_ALLOC_REC_ADDR(left, lrecs + 1, cur);
498 rrp = XFS_ALLOC_REC_ADDR(right, 1, cur);
499 memcpy(lrp, rrp, rrecs * sizeof(*lrp));
500 xfs_alloc_log_recs(cur, lbp, lrecs + 1, lrecs + rrecs);
503 * If we joined with the left neighbor, set the buffer in the
504 * cursor to the left block, and fix up the index.
507 xfs_btree_setbuf(cur, level, lbp);
508 cur->bc_ptrs[level] += lrecs;
511 * If we joined with the right neighbor and there's a level above
512 * us, increment the cursor at that level.
514 else if (level + 1 < cur->bc_nlevels &&
515 (error = xfs_btree_increment(cur, level + 1, &i)))
518 * Fix up the number of records in the surviving block.
521 left->bb_numrecs = cpu_to_be16(lrecs);
523 * Fix up the right block pointer in the surviving block, and log it.
525 left->bb_rightsib = right->bb_rightsib;
526 xfs_alloc_log_block(cur->bc_tp, lbp, XFS_BB_NUMRECS | XFS_BB_RIGHTSIB);
528 * If there is a right sibling now, make it point to the
531 if (be32_to_cpu(left->bb_rightsib) != NULLAGBLOCK) {
532 xfs_alloc_block_t *rrblock;
535 if ((error = xfs_btree_read_bufs(mp, cur->bc_tp,
536 cur->bc_private.a.agno, be32_to_cpu(left->bb_rightsib), 0,
537 &rrbp, XFS_ALLOC_BTREE_REF)))
539 rrblock = XFS_BUF_TO_ALLOC_BLOCK(rrbp);
540 if ((error = xfs_btree_check_sblock(cur, rrblock, level, rrbp)))
542 rrblock->bb_leftsib = cpu_to_be32(lbno);
543 xfs_alloc_log_block(cur->bc_tp, rrbp, XFS_BB_LEFTSIB);
546 * Free the deleting block by putting it on the freelist.
548 error = xfs_alloc_put_freelist(cur->bc_tp,
549 cur->bc_private.a.agbp, NULL, rbno, 1);
553 * Since blocks move to the free list without the coordination
554 * used in xfs_bmap_finish, we can't allow block to be available
555 * for reallocation and non-transaction writing (user data)
556 * until we know that the transaction that moved it to the free
557 * list is permanently on disk. We track the blocks by declaring
558 * these blocks as "busy"; the busy list is maintained on a
559 * per-ag basis and each transaction records which entries
560 * should be removed when the iclog commits to disk. If a
561 * busy block is allocated, the iclog is pushed up to the
562 * LSN that freed the block.
564 xfs_alloc_mark_busy(cur->bc_tp, be32_to_cpu(agf->agf_seqno), bno, 1);
565 xfs_trans_agbtree_delta(cur->bc_tp, -1);
568 * Adjust the current level's cursor so that we're left referring
569 * to the right node, after we're done.
570 * If this leaves the ptr value 0 our caller will fix it up.
573 cur->bc_ptrs[level]--;
575 * Return value means the next level up has something to do.
581 xfs_btree_del_cursor(tcur, XFS_BTREE_ERROR);
586 * Log header fields from a btree block.
590 xfs_trans_t *tp, /* transaction pointer */
591 xfs_buf_t *bp, /* buffer containing btree block */
592 int fields) /* mask of fields: XFS_BB_... */
594 int first; /* first byte offset logged */
595 int last; /* last byte offset logged */
596 static const short offsets[] = { /* table of offsets */
597 offsetof(xfs_alloc_block_t, bb_magic),
598 offsetof(xfs_alloc_block_t, bb_level),
599 offsetof(xfs_alloc_block_t, bb_numrecs),
600 offsetof(xfs_alloc_block_t, bb_leftsib),
601 offsetof(xfs_alloc_block_t, bb_rightsib),
602 sizeof(xfs_alloc_block_t)
605 xfs_btree_offsets(fields, offsets, XFS_BB_NUM_BITS, &first, &last);
606 xfs_trans_log_buf(tp, bp, first, last);
610 * Log keys from a btree block (nonleaf).
614 xfs_btree_cur_t *cur, /* btree cursor */
615 xfs_buf_t *bp, /* buffer containing btree block */
616 int kfirst, /* index of first key to log */
617 int klast) /* index of last key to log */
619 xfs_alloc_block_t *block; /* btree block to log from */
620 int first; /* first byte offset logged */
621 xfs_alloc_key_t *kp; /* key pointer in btree block */
622 int last; /* last byte offset logged */
624 block = XFS_BUF_TO_ALLOC_BLOCK(bp);
625 kp = XFS_ALLOC_KEY_ADDR(block, 1, cur);
626 first = (int)((xfs_caddr_t)&kp[kfirst - 1] - (xfs_caddr_t)block);
627 last = (int)(((xfs_caddr_t)&kp[klast] - 1) - (xfs_caddr_t)block);
628 xfs_trans_log_buf(cur->bc_tp, bp, first, last);
632 * Log block pointer fields from a btree block (nonleaf).
636 xfs_btree_cur_t *cur, /* btree cursor */
637 xfs_buf_t *bp, /* buffer containing btree block */
638 int pfirst, /* index of first pointer to log */
639 int plast) /* index of last pointer to log */
641 xfs_alloc_block_t *block; /* btree block to log from */
642 int first; /* first byte offset logged */
643 int last; /* last byte offset logged */
644 xfs_alloc_ptr_t *pp; /* block-pointer pointer in btree blk */
646 block = XFS_BUF_TO_ALLOC_BLOCK(bp);
647 pp = XFS_ALLOC_PTR_ADDR(block, 1, cur);
648 first = (int)((xfs_caddr_t)&pp[pfirst - 1] - (xfs_caddr_t)block);
649 last = (int)(((xfs_caddr_t)&pp[plast] - 1) - (xfs_caddr_t)block);
650 xfs_trans_log_buf(cur->bc_tp, bp, first, last);
654 * Log records from a btree block (leaf).
658 xfs_btree_cur_t *cur, /* btree cursor */
659 xfs_buf_t *bp, /* buffer containing btree block */
660 int rfirst, /* index of first record to log */
661 int rlast) /* index of last record to log */
663 xfs_alloc_block_t *block; /* btree block to log from */
664 int first; /* first byte offset logged */
665 int last; /* last byte offset logged */
666 xfs_alloc_rec_t *rp; /* record pointer for btree block */
669 block = XFS_BUF_TO_ALLOC_BLOCK(bp);
670 rp = XFS_ALLOC_REC_ADDR(block, 1, cur);
676 agf = XFS_BUF_TO_AGF(cur->bc_private.a.agbp);
677 for (p = &rp[rfirst - 1]; p <= &rp[rlast - 1]; p++)
678 ASSERT(be32_to_cpu(p->ar_startblock) +
679 be32_to_cpu(p->ar_blockcount) <=
680 be32_to_cpu(agf->agf_length));
683 first = (int)((xfs_caddr_t)&rp[rfirst - 1] - (xfs_caddr_t)block);
684 last = (int)(((xfs_caddr_t)&rp[rlast] - 1) - (xfs_caddr_t)block);
685 xfs_trans_log_buf(cur->bc_tp, bp, first, last);
690 * Externally visible routines.
694 * Delete the record pointed to by cur.
695 * The cursor refers to the place where the record was (could be inserted)
696 * when the operation returns.
700 xfs_btree_cur_t *cur, /* btree cursor */
701 int *stat) /* success/failure */
703 int error; /* error return value */
704 int i; /* result code */
705 int level; /* btree level */
708 * Go up the tree, starting at leaf level.
709 * If 2 is returned then a join was done; go to the next level.
710 * Otherwise we are done.
712 for (level = 0, i = 2; i == 2; level++) {
713 if ((error = xfs_alloc_delrec(cur, level, &i)))
717 for (level = 1; level < cur->bc_nlevels; level++) {
718 if (cur->bc_ptrs[level] == 0) {
719 if ((error = xfs_btree_decrement(cur, level, &i)))
730 * Get the data from the pointed-to record.
734 xfs_btree_cur_t *cur, /* btree cursor */
735 xfs_agblock_t *bno, /* output: starting block of extent */
736 xfs_extlen_t *len, /* output: length of extent */
737 int *stat) /* output: success/failure */
739 xfs_alloc_block_t *block; /* btree block */
741 int error; /* error return value */
743 int ptr; /* record number */
745 ptr = cur->bc_ptrs[0];
746 block = XFS_BUF_TO_ALLOC_BLOCK(cur->bc_bufs[0]);
748 if ((error = xfs_btree_check_sblock(cur, block, 0, cur->bc_bufs[0])))
752 * Off the right end or left end, return failure.
754 if (ptr > be16_to_cpu(block->bb_numrecs) || ptr <= 0) {
759 * Point to the record and extract its data.
762 xfs_alloc_rec_t *rec; /* record data */
764 rec = XFS_ALLOC_REC_ADDR(block, ptr, cur);
765 *bno = be32_to_cpu(rec->ar_startblock);
766 *len = be32_to_cpu(rec->ar_blockcount);
773 STATIC struct xfs_btree_cur *
774 xfs_allocbt_dup_cursor(
775 struct xfs_btree_cur *cur)
777 return xfs_allocbt_init_cursor(cur->bc_mp, cur->bc_tp,
778 cur->bc_private.a.agbp, cur->bc_private.a.agno,
783 xfs_allocbt_set_root(
784 struct xfs_btree_cur *cur,
785 union xfs_btree_ptr *ptr,
788 struct xfs_buf *agbp = cur->bc_private.a.agbp;
789 struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp);
790 xfs_agnumber_t seqno = be32_to_cpu(agf->agf_seqno);
791 int btnum = cur->bc_btnum;
795 agf->agf_roots[btnum] = ptr->s;
796 be32_add_cpu(&agf->agf_levels[btnum], inc);
797 cur->bc_mp->m_perag[seqno].pagf_levels[btnum] += inc;
799 xfs_alloc_log_agf(cur->bc_tp, agbp, XFS_AGF_ROOTS | XFS_AGF_LEVELS);
803 xfs_allocbt_alloc_block(
804 struct xfs_btree_cur *cur,
805 union xfs_btree_ptr *start,
806 union xfs_btree_ptr *new,
813 XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);
815 /* Allocate the new block from the freelist. If we can't, give up. */
816 error = xfs_alloc_get_freelist(cur->bc_tp, cur->bc_private.a.agbp,
819 XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
823 if (bno == NULLAGBLOCK) {
824 XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
829 xfs_trans_agbtree_delta(cur->bc_tp, 1);
830 new->s = cpu_to_be32(bno);
832 XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
838 * Update the longest extent in the AGF
841 xfs_allocbt_update_lastrec(
842 struct xfs_btree_cur *cur,
843 struct xfs_btree_block *block,
844 union xfs_btree_rec *rec,
848 struct xfs_agf *agf = XFS_BUF_TO_AGF(cur->bc_private.a.agbp);
849 xfs_agnumber_t seqno = be32_to_cpu(agf->agf_seqno);
852 ASSERT(cur->bc_btnum == XFS_BTNUM_CNT);
857 * If this is the last leaf block and it's the last record,
858 * then update the size of the longest extent in the AG.
860 if (ptr != xfs_btree_get_numrecs(block))
862 len = rec->alloc.ar_blockcount;
865 if (be32_to_cpu(rec->alloc.ar_blockcount) <=
866 be32_to_cpu(agf->agf_longest))
868 len = rec->alloc.ar_blockcount;
875 agf->agf_longest = len;
876 cur->bc_mp->m_perag[seqno].pagf_longest = be32_to_cpu(len);
877 xfs_alloc_log_agf(cur->bc_tp, cur->bc_private.a.agbp, XFS_AGF_LONGEST);
881 xfs_allocbt_get_maxrecs(
882 struct xfs_btree_cur *cur,
885 return cur->bc_mp->m_alloc_mxr[level != 0];
889 xfs_allocbt_init_key_from_rec(
890 union xfs_btree_key *key,
891 union xfs_btree_rec *rec)
893 ASSERT(rec->alloc.ar_startblock != 0);
895 key->alloc.ar_startblock = rec->alloc.ar_startblock;
896 key->alloc.ar_blockcount = rec->alloc.ar_blockcount;
900 xfs_allocbt_init_rec_from_key(
901 union xfs_btree_key *key,
902 union xfs_btree_rec *rec)
904 ASSERT(key->alloc.ar_startblock != 0);
906 rec->alloc.ar_startblock = key->alloc.ar_startblock;
907 rec->alloc.ar_blockcount = key->alloc.ar_blockcount;
911 xfs_allocbt_init_rec_from_cur(
912 struct xfs_btree_cur *cur,
913 union xfs_btree_rec *rec)
915 ASSERT(cur->bc_rec.a.ar_startblock != 0);
917 rec->alloc.ar_startblock = cpu_to_be32(cur->bc_rec.a.ar_startblock);
918 rec->alloc.ar_blockcount = cpu_to_be32(cur->bc_rec.a.ar_blockcount);
922 xfs_allocbt_init_ptr_from_cur(
923 struct xfs_btree_cur *cur,
924 union xfs_btree_ptr *ptr)
926 struct xfs_agf *agf = XFS_BUF_TO_AGF(cur->bc_private.a.agbp);
928 ASSERT(cur->bc_private.a.agno == be32_to_cpu(agf->agf_seqno));
929 ASSERT(agf->agf_roots[cur->bc_btnum] != 0);
931 ptr->s = agf->agf_roots[cur->bc_btnum];
935 xfs_allocbt_key_diff(
936 struct xfs_btree_cur *cur,
937 union xfs_btree_key *key)
939 xfs_alloc_rec_incore_t *rec = &cur->bc_rec.a;
940 xfs_alloc_key_t *kp = &key->alloc;
943 if (cur->bc_btnum == XFS_BTNUM_BNO) {
944 return (__int64_t)be32_to_cpu(kp->ar_startblock) -
948 diff = (__int64_t)be32_to_cpu(kp->ar_blockcount) - rec->ar_blockcount;
952 return (__int64_t)be32_to_cpu(kp->ar_startblock) - rec->ar_startblock;
955 #ifdef XFS_BTREE_TRACE
956 ktrace_t *xfs_allocbt_trace_buf;
959 xfs_allocbt_trace_enter(
960 struct xfs_btree_cur *cur,
977 ktrace_enter(xfs_allocbt_trace_buf, (void *)(__psint_t)type,
978 (void *)func, (void *)s, NULL, (void *)cur,
979 (void *)a0, (void *)a1, (void *)a2, (void *)a3,
980 (void *)a4, (void *)a5, (void *)a6, (void *)a7,
981 (void *)a8, (void *)a9, (void *)a10);
985 xfs_allocbt_trace_cursor(
986 struct xfs_btree_cur *cur,
991 *s0 = cur->bc_private.a.agno;
992 *l0 = cur->bc_rec.a.ar_startblock;
993 *l1 = cur->bc_rec.a.ar_blockcount;
997 xfs_allocbt_trace_key(
998 struct xfs_btree_cur *cur,
999 union xfs_btree_key *key,
1003 *l0 = be32_to_cpu(key->alloc.ar_startblock);
1004 *l1 = be32_to_cpu(key->alloc.ar_blockcount);
1008 xfs_allocbt_trace_record(
1009 struct xfs_btree_cur *cur,
1010 union xfs_btree_rec *rec,
1015 *l0 = be32_to_cpu(rec->alloc.ar_startblock);
1016 *l1 = be32_to_cpu(rec->alloc.ar_blockcount);
1019 #endif /* XFS_BTREE_TRACE */
1021 static const struct xfs_btree_ops xfs_allocbt_ops = {
1022 .rec_len = sizeof(xfs_alloc_rec_t),
1023 .key_len = sizeof(xfs_alloc_key_t),
1025 .dup_cursor = xfs_allocbt_dup_cursor,
1026 .set_root = xfs_allocbt_set_root,
1027 .alloc_block = xfs_allocbt_alloc_block,
1028 .update_lastrec = xfs_allocbt_update_lastrec,
1029 .get_maxrecs = xfs_allocbt_get_maxrecs,
1030 .init_key_from_rec = xfs_allocbt_init_key_from_rec,
1031 .init_rec_from_key = xfs_allocbt_init_rec_from_key,
1032 .init_rec_from_cur = xfs_allocbt_init_rec_from_cur,
1033 .init_ptr_from_cur = xfs_allocbt_init_ptr_from_cur,
1034 .key_diff = xfs_allocbt_key_diff,
1036 #ifdef XFS_BTREE_TRACE
1037 .trace_enter = xfs_allocbt_trace_enter,
1038 .trace_cursor = xfs_allocbt_trace_cursor,
1039 .trace_key = xfs_allocbt_trace_key,
1040 .trace_record = xfs_allocbt_trace_record,
1045 * Allocate a new allocation btree cursor.
1047 struct xfs_btree_cur * /* new alloc btree cursor */
1048 xfs_allocbt_init_cursor(
1049 struct xfs_mount *mp, /* file system mount point */
1050 struct xfs_trans *tp, /* transaction pointer */
1051 struct xfs_buf *agbp, /* buffer for agf structure */
1052 xfs_agnumber_t agno, /* allocation group number */
1053 xfs_btnum_t btnum) /* btree identifier */
1055 struct xfs_agf *agf = XFS_BUF_TO_AGF(agbp);
1056 struct xfs_btree_cur *cur;
1058 ASSERT(btnum == XFS_BTNUM_BNO || btnum == XFS_BTNUM_CNT);
1060 cur = kmem_zone_zalloc(xfs_btree_cur_zone, KM_SLEEP);
1064 cur->bc_nlevels = be32_to_cpu(agf->agf_levels[btnum]);
1065 cur->bc_btnum = btnum;
1066 cur->bc_blocklog = mp->m_sb.sb_blocklog;
1068 cur->bc_ops = &xfs_allocbt_ops;
1069 if (btnum == XFS_BTNUM_CNT)
1070 cur->bc_flags = XFS_BTREE_LASTREC_UPDATE;
1072 cur->bc_private.a.agbp = agbp;
1073 cur->bc_private.a.agno = agno;