[XFS] implement generic xfs_btree_delete/delrec
Make the btree delete code generic. Based on a patch from David Chinner
with lots of changes to follow the original btree implementations more
closely. While this loses some of the generic helper routines for
inserting/moving/removing records it also solves some of the one off bugs
in the original code and makes it easier to verify.
SGI-PV: 985583
SGI-Modid: xfs-linux-melb:xfs-kern:32205a
Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
Signed-off-by: Bill O'Donnell <billodo@sgi.com>
Signed-off-by: David Chinner <david@fromorbit.com>
diff --git a/fs/xfs/xfs_ialloc_btree.c b/fs/xfs/xfs_ialloc_btree.c
index 90f1d4ee..6c0a07d 100644
--- a/fs/xfs/xfs_ialloc_btree.c
+++ b/fs/xfs/xfs_ialloc_btree.c
@@ -40,611 +40,6 @@
#include "xfs_alloc.h"
#include "xfs_error.h"
-STATIC void xfs_inobt_log_block(xfs_trans_t *, xfs_buf_t *, int);
-STATIC void xfs_inobt_log_keys(xfs_btree_cur_t *, xfs_buf_t *, int, int);
-STATIC void xfs_inobt_log_ptrs(xfs_btree_cur_t *, xfs_buf_t *, int, int);
-STATIC void xfs_inobt_log_recs(xfs_btree_cur_t *, xfs_buf_t *, int, int);
-
-/*
- * Single level of the xfs_inobt_delete record deletion routine.
- * Delete record pointed to by cur/level.
- * Remove the record from its block then rebalance the tree.
- * Return 0 for error, 1 for done, 2 to go on to the next level.
- */
-STATIC int /* error */
-xfs_inobt_delrec(
- xfs_btree_cur_t *cur, /* btree cursor */
- int level, /* level removing record from */
- int *stat) /* fail/done/go-on */
-{
- xfs_buf_t *agbp; /* buffer for a.g. inode header */
- xfs_mount_t *mp; /* mount structure */
- xfs_agi_t *agi; /* allocation group inode header */
- xfs_inobt_block_t *block; /* btree block record/key lives in */
- xfs_agblock_t bno; /* btree block number */
- xfs_buf_t *bp; /* buffer for block */
- int error; /* error return value */
- int i; /* loop index */
- xfs_inobt_key_t key; /* kp points here if block is level 0 */
- xfs_inobt_key_t *kp = NULL; /* pointer to btree keys */
- xfs_agblock_t lbno; /* left block's block number */
- xfs_buf_t *lbp; /* left block's buffer pointer */
- xfs_inobt_block_t *left; /* left btree block */
- xfs_inobt_key_t *lkp; /* left block key pointer */
- xfs_inobt_ptr_t *lpp; /* left block address pointer */
- int lrecs = 0; /* number of records in left block */
- xfs_inobt_rec_t *lrp; /* left block record pointer */
- xfs_inobt_ptr_t *pp = NULL; /* pointer to btree addresses */
- int ptr; /* index in btree block for this rec */
- xfs_agblock_t rbno; /* right block's block number */
- xfs_buf_t *rbp; /* right block's buffer pointer */
- xfs_inobt_block_t *right; /* right btree block */
- xfs_inobt_key_t *rkp; /* right block key pointer */
- xfs_inobt_rec_t *rp; /* pointer to btree records */
- xfs_inobt_ptr_t *rpp; /* right block address pointer */
- int rrecs = 0; /* number of records in right block */
- int numrecs;
- xfs_inobt_rec_t *rrp; /* right block record pointer */
- xfs_btree_cur_t *tcur; /* temporary btree cursor */
-
- mp = cur->bc_mp;
-
- /*
- * Get the index of the entry being deleted, check for nothing there.
- */
- ptr = cur->bc_ptrs[level];
- if (ptr == 0) {
- *stat = 0;
- return 0;
- }
-
- /*
- * Get the buffer & block containing the record or key/ptr.
- */
- bp = cur->bc_bufs[level];
- block = XFS_BUF_TO_INOBT_BLOCK(bp);
-#ifdef DEBUG
- if ((error = xfs_btree_check_sblock(cur, block, level, bp)))
- return error;
-#endif
- /*
- * Fail if we're off the end of the block.
- */
-
- numrecs = be16_to_cpu(block->bb_numrecs);
- if (ptr > numrecs) {
- *stat = 0;
- return 0;
- }
- /*
- * It's a nonleaf. Excise the key and ptr being deleted, by
- * sliding the entries past them down one.
- * Log the changed areas of the block.
- */
- if (level > 0) {
- kp = XFS_INOBT_KEY_ADDR(block, 1, cur);
- pp = XFS_INOBT_PTR_ADDR(block, 1, cur);
-#ifdef DEBUG
- for (i = ptr; i < numrecs; i++) {
- if ((error = xfs_btree_check_sptr(cur, be32_to_cpu(pp[i]), level)))
- return error;
- }
-#endif
- if (ptr < numrecs) {
- memmove(&kp[ptr - 1], &kp[ptr],
- (numrecs - ptr) * sizeof(*kp));
- memmove(&pp[ptr - 1], &pp[ptr],
- (numrecs - ptr) * sizeof(*kp));
- xfs_inobt_log_keys(cur, bp, ptr, numrecs - 1);
- xfs_inobt_log_ptrs(cur, bp, ptr, numrecs - 1);
- }
- }
- /*
- * It's a leaf. Excise the record being deleted, by sliding the
- * entries past it down one. Log the changed areas of the block.
- */
- else {
- rp = XFS_INOBT_REC_ADDR(block, 1, cur);
- if (ptr < numrecs) {
- memmove(&rp[ptr - 1], &rp[ptr],
- (numrecs - ptr) * sizeof(*rp));
- xfs_inobt_log_recs(cur, bp, ptr, numrecs - 1);
- }
- /*
- * If it's the first record in the block, we'll need a key
- * structure to pass up to the next level (updkey).
- */
- if (ptr == 1) {
- key.ir_startino = rp->ir_startino;
- kp = &key;
- }
- }
- /*
- * Decrement and log the number of entries in the block.
- */
- numrecs--;
- block->bb_numrecs = cpu_to_be16(numrecs);
- xfs_inobt_log_block(cur->bc_tp, bp, XFS_BB_NUMRECS);
- /*
- * Is this the root level? If so, we're almost done.
- */
- if (level == cur->bc_nlevels - 1) {
- /*
- * If this is the root level,
- * and there's only one entry left,
- * and it's NOT the leaf level,
- * then we can get rid of this level.
- */
- if (numrecs == 1 && level > 0) {
- agbp = cur->bc_private.a.agbp;
- agi = XFS_BUF_TO_AGI(agbp);
- /*
- * pp is still set to the first pointer in the block.
- * Make it the new root of the btree.
- */
- bno = be32_to_cpu(agi->agi_root);
- agi->agi_root = *pp;
- be32_add_cpu(&agi->agi_level, -1);
- /*
- * Free the block.
- */
- if ((error = xfs_free_extent(cur->bc_tp,
- XFS_AGB_TO_FSB(mp, cur->bc_private.a.agno, bno), 1)))
- return error;
- xfs_trans_binval(cur->bc_tp, bp);
- xfs_ialloc_log_agi(cur->bc_tp, agbp,
- XFS_AGI_ROOT | XFS_AGI_LEVEL);
- /*
- * Update the cursor so there's one fewer level.
- */
- cur->bc_bufs[level] = NULL;
- cur->bc_nlevels--;
- } else if (level > 0 &&
- (error = xfs_btree_decrement(cur, level, &i)))
- return error;
- *stat = 1;
- return 0;
- }
- /*
- * If we deleted the leftmost entry in the block, update the
- * key values above us in the tree.
- */
- if (ptr == 1 && (error = xfs_btree_updkey(cur, (union xfs_btree_key *)kp, level + 1)))
- return error;
- /*
- * If the number of records remaining in the block is at least
- * the minimum, we're done.
- */
- if (numrecs >= XFS_INOBT_BLOCK_MINRECS(level, cur)) {
- if (level > 0 &&
- (error = xfs_btree_decrement(cur, level, &i)))
- return error;
- *stat = 1;
- return 0;
- }
- /*
- * Otherwise, we have to move some records around to keep the
- * tree balanced. Look at the left and right sibling blocks to
- * see if we can re-balance by moving only one record.
- */
- rbno = be32_to_cpu(block->bb_rightsib);
- lbno = be32_to_cpu(block->bb_leftsib);
- bno = NULLAGBLOCK;
- ASSERT(rbno != NULLAGBLOCK || lbno != NULLAGBLOCK);
- /*
- * Duplicate the cursor so our btree manipulations here won't
- * disrupt the next level up.
- */
- if ((error = xfs_btree_dup_cursor(cur, &tcur)))
- return error;
- /*
- * If there's a right sibling, see if it's ok to shift an entry
- * out of it.
- */
- if (rbno != NULLAGBLOCK) {
- /*
- * Move the temp cursor to the last entry in the next block.
- * Actually any entry but the first would suffice.
- */
- i = xfs_btree_lastrec(tcur, level);
- XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
- if ((error = xfs_btree_increment(tcur, level, &i)))
- goto error0;
- XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
- i = xfs_btree_lastrec(tcur, level);
- XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
- /*
- * Grab a pointer to the block.
- */
- rbp = tcur->bc_bufs[level];
- right = XFS_BUF_TO_INOBT_BLOCK(rbp);
-#ifdef DEBUG
- if ((error = xfs_btree_check_sblock(cur, right, level, rbp)))
- goto error0;
-#endif
- /*
- * Grab the current block number, for future use.
- */
- bno = be32_to_cpu(right->bb_leftsib);
- /*
- * If right block is full enough so that removing one entry
- * won't make it too empty, and left-shifting an entry out
- * of right to us works, we're done.
- */
- if (be16_to_cpu(right->bb_numrecs) - 1 >=
- XFS_INOBT_BLOCK_MINRECS(level, cur)) {
- if ((error = xfs_btree_lshift(tcur, level, &i)))
- goto error0;
- if (i) {
- ASSERT(be16_to_cpu(block->bb_numrecs) >=
- XFS_INOBT_BLOCK_MINRECS(level, cur));
- xfs_btree_del_cursor(tcur,
- XFS_BTREE_NOERROR);
- if (level > 0 &&
- (error = xfs_btree_decrement(cur, level,
- &i)))
- return error;
- *stat = 1;
- return 0;
- }
- }
- /*
- * Otherwise, grab the number of records in right for
- * future reference, and fix up the temp cursor to point
- * to our block again (last record).
- */
- rrecs = be16_to_cpu(right->bb_numrecs);
- if (lbno != NULLAGBLOCK) {
- xfs_btree_firstrec(tcur, level);
- if ((error = xfs_btree_decrement(tcur, level, &i)))
- goto error0;
- }
- }
- /*
- * If there's a left sibling, see if it's ok to shift an entry
- * out of it.
- */
- if (lbno != NULLAGBLOCK) {
- /*
- * Move the temp cursor to the first entry in the
- * previous block.
- */
- xfs_btree_firstrec(tcur, level);
- if ((error = xfs_btree_decrement(tcur, level, &i)))
- goto error0;
- xfs_btree_firstrec(tcur, level);
- /*
- * Grab a pointer to the block.
- */
- lbp = tcur->bc_bufs[level];
- left = XFS_BUF_TO_INOBT_BLOCK(lbp);
-#ifdef DEBUG
- if ((error = xfs_btree_check_sblock(cur, left, level, lbp)))
- goto error0;
-#endif
- /*
- * Grab the current block number, for future use.
- */
- bno = be32_to_cpu(left->bb_rightsib);
- /*
- * If left block is full enough so that removing one entry
- * won't make it too empty, and right-shifting an entry out
- * of left to us works, we're done.
- */
- if (be16_to_cpu(left->bb_numrecs) - 1 >=
- XFS_INOBT_BLOCK_MINRECS(level, cur)) {
- if ((error = xfs_btree_rshift(tcur, level, &i)))
- goto error0;
- if (i) {
- ASSERT(be16_to_cpu(block->bb_numrecs) >=
- XFS_INOBT_BLOCK_MINRECS(level, cur));
- xfs_btree_del_cursor(tcur,
- XFS_BTREE_NOERROR);
- if (level == 0)
- cur->bc_ptrs[0]++;
- *stat = 1;
- return 0;
- }
- }
- /*
- * Otherwise, grab the number of records in right for
- * future reference.
- */
- lrecs = be16_to_cpu(left->bb_numrecs);
- }
- /*
- * Delete the temp cursor, we're done with it.
- */
- xfs_btree_del_cursor(tcur, XFS_BTREE_NOERROR);
- /*
- * If here, we need to do a join to keep the tree balanced.
- */
- ASSERT(bno != NULLAGBLOCK);
- /*
- * See if we can join with the left neighbor block.
- */
- if (lbno != NULLAGBLOCK &&
- lrecs + numrecs <= XFS_INOBT_BLOCK_MAXRECS(level, cur)) {
- /*
- * Set "right" to be the starting block,
- * "left" to be the left neighbor.
- */
- rbno = bno;
- right = block;
- rrecs = be16_to_cpu(right->bb_numrecs);
- rbp = bp;
- if ((error = xfs_btree_read_bufs(mp, cur->bc_tp,
- cur->bc_private.a.agno, lbno, 0, &lbp,
- XFS_INO_BTREE_REF)))
- return error;
- left = XFS_BUF_TO_INOBT_BLOCK(lbp);
- lrecs = be16_to_cpu(left->bb_numrecs);
- if ((error = xfs_btree_check_sblock(cur, left, level, lbp)))
- return error;
- }
- /*
- * If that won't work, see if we can join with the right neighbor block.
- */
- else if (rbno != NULLAGBLOCK &&
- rrecs + numrecs <= XFS_INOBT_BLOCK_MAXRECS(level, cur)) {
- /*
- * Set "left" to be the starting block,
- * "right" to be the right neighbor.
- */
- lbno = bno;
- left = block;
- lrecs = be16_to_cpu(left->bb_numrecs);
- lbp = bp;
- if ((error = xfs_btree_read_bufs(mp, cur->bc_tp,
- cur->bc_private.a.agno, rbno, 0, &rbp,
- XFS_INO_BTREE_REF)))
- return error;
- right = XFS_BUF_TO_INOBT_BLOCK(rbp);
- rrecs = be16_to_cpu(right->bb_numrecs);
- if ((error = xfs_btree_check_sblock(cur, right, level, rbp)))
- return error;
- }
- /*
- * Otherwise, we can't fix the imbalance.
- * Just return. This is probably a logic error, but it's not fatal.
- */
- else {
- if (level > 0 && (error = xfs_btree_decrement(cur, level, &i)))
- return error;
- *stat = 1;
- return 0;
- }
- /*
- * We're now going to join "left" and "right" by moving all the stuff
- * in "right" to "left" and deleting "right".
- */
- if (level > 0) {
- /*
- * It's a non-leaf. Move keys and pointers.
- */
- lkp = XFS_INOBT_KEY_ADDR(left, lrecs + 1, cur);
- lpp = XFS_INOBT_PTR_ADDR(left, lrecs + 1, cur);
- rkp = XFS_INOBT_KEY_ADDR(right, 1, cur);
- rpp = XFS_INOBT_PTR_ADDR(right, 1, cur);
-#ifdef DEBUG
- for (i = 0; i < rrecs; i++) {
- if ((error = xfs_btree_check_sptr(cur, be32_to_cpu(rpp[i]), level)))
- return error;
- }
-#endif
- memcpy(lkp, rkp, rrecs * sizeof(*lkp));
- memcpy(lpp, rpp, rrecs * sizeof(*lpp));
- xfs_inobt_log_keys(cur, lbp, lrecs + 1, lrecs + rrecs);
- xfs_inobt_log_ptrs(cur, lbp, lrecs + 1, lrecs + rrecs);
- } else {
- /*
- * It's a leaf. Move records.
- */
- lrp = XFS_INOBT_REC_ADDR(left, lrecs + 1, cur);
- rrp = XFS_INOBT_REC_ADDR(right, 1, cur);
- memcpy(lrp, rrp, rrecs * sizeof(*lrp));
- xfs_inobt_log_recs(cur, lbp, lrecs + 1, lrecs + rrecs);
- }
- /*
- * If we joined with the left neighbor, set the buffer in the
- * cursor to the left block, and fix up the index.
- */
- if (bp != lbp) {
- xfs_btree_setbuf(cur, level, lbp);
- cur->bc_ptrs[level] += lrecs;
- }
- /*
- * If we joined with the right neighbor and there's a level above
- * us, increment the cursor at that level.
- */
- else if (level + 1 < cur->bc_nlevels &&
- (error = xfs_btree_increment(cur, level + 1, &i)))
- return error;
- /*
- * Fix up the number of records in the surviving block.
- */
- lrecs += rrecs;
- left->bb_numrecs = cpu_to_be16(lrecs);
- /*
- * Fix up the right block pointer in the surviving block, and log it.
- */
- left->bb_rightsib = right->bb_rightsib;
- xfs_inobt_log_block(cur->bc_tp, lbp, XFS_BB_NUMRECS | XFS_BB_RIGHTSIB);
- /*
- * If there is a right sibling now, make it point to the
- * remaining block.
- */
- if (be32_to_cpu(left->bb_rightsib) != NULLAGBLOCK) {
- xfs_inobt_block_t *rrblock;
- xfs_buf_t *rrbp;
-
- if ((error = xfs_btree_read_bufs(mp, cur->bc_tp,
- cur->bc_private.a.agno, be32_to_cpu(left->bb_rightsib), 0,
- &rrbp, XFS_INO_BTREE_REF)))
- return error;
- rrblock = XFS_BUF_TO_INOBT_BLOCK(rrbp);
- if ((error = xfs_btree_check_sblock(cur, rrblock, level, rrbp)))
- return error;
- rrblock->bb_leftsib = cpu_to_be32(lbno);
- xfs_inobt_log_block(cur->bc_tp, rrbp, XFS_BB_LEFTSIB);
- }
- /*
- * Free the deleting block.
- */
- if ((error = xfs_free_extent(cur->bc_tp, XFS_AGB_TO_FSB(mp,
- cur->bc_private.a.agno, rbno), 1)))
- return error;
- xfs_trans_binval(cur->bc_tp, rbp);
- /*
- * Readjust the ptr at this level if it's not a leaf, since it's
- * still pointing at the deletion point, which makes the cursor
- * inconsistent. If this makes the ptr 0, the caller fixes it up.
- * We can't use decrement because it would change the next level up.
- */
- if (level > 0)
- cur->bc_ptrs[level]--;
- /*
- * Return value means the next level up has something to do.
- */
- *stat = 2;
- return 0;
-
-error0:
- xfs_btree_del_cursor(tcur, XFS_BTREE_ERROR);
- return error;
-}
-
-/*
- * Log header fields from a btree block.
- */
-STATIC void
-xfs_inobt_log_block(
- xfs_trans_t *tp, /* transaction pointer */
- xfs_buf_t *bp, /* buffer containing btree block */
- int fields) /* mask of fields: XFS_BB_... */
-{
- int first; /* first byte offset logged */
- int last; /* last byte offset logged */
- static const short offsets[] = { /* table of offsets */
- offsetof(xfs_inobt_block_t, bb_magic),
- offsetof(xfs_inobt_block_t, bb_level),
- offsetof(xfs_inobt_block_t, bb_numrecs),
- offsetof(xfs_inobt_block_t, bb_leftsib),
- offsetof(xfs_inobt_block_t, bb_rightsib),
- sizeof(xfs_inobt_block_t)
- };
-
- xfs_btree_offsets(fields, offsets, XFS_BB_NUM_BITS, &first, &last);
- xfs_trans_log_buf(tp, bp, first, last);
-}
-
-/*
- * Log keys from a btree block (nonleaf).
- */
-STATIC void
-xfs_inobt_log_keys(
- xfs_btree_cur_t *cur, /* btree cursor */
- xfs_buf_t *bp, /* buffer containing btree block */
- int kfirst, /* index of first key to log */
- int klast) /* index of last key to log */
-{
- xfs_inobt_block_t *block; /* btree block to log from */
- int first; /* first byte offset logged */
- xfs_inobt_key_t *kp; /* key pointer in btree block */
- int last; /* last byte offset logged */
-
- block = XFS_BUF_TO_INOBT_BLOCK(bp);
- kp = XFS_INOBT_KEY_ADDR(block, 1, cur);
- first = (int)((xfs_caddr_t)&kp[kfirst - 1] - (xfs_caddr_t)block);
- last = (int)(((xfs_caddr_t)&kp[klast] - 1) - (xfs_caddr_t)block);
- xfs_trans_log_buf(cur->bc_tp, bp, first, last);
-}
-
-/*
- * Log block pointer fields from a btree block (nonleaf).
- */
-STATIC void
-xfs_inobt_log_ptrs(
- xfs_btree_cur_t *cur, /* btree cursor */
- xfs_buf_t *bp, /* buffer containing btree block */
- int pfirst, /* index of first pointer to log */
- int plast) /* index of last pointer to log */
-{
- xfs_inobt_block_t *block; /* btree block to log from */
- int first; /* first byte offset logged */
- int last; /* last byte offset logged */
- xfs_inobt_ptr_t *pp; /* block-pointer pointer in btree blk */
-
- block = XFS_BUF_TO_INOBT_BLOCK(bp);
- pp = XFS_INOBT_PTR_ADDR(block, 1, cur);
- first = (int)((xfs_caddr_t)&pp[pfirst - 1] - (xfs_caddr_t)block);
- last = (int)(((xfs_caddr_t)&pp[plast] - 1) - (xfs_caddr_t)block);
- xfs_trans_log_buf(cur->bc_tp, bp, first, last);
-}
-
-/*
- * Log records from a btree block (leaf).
- */
-STATIC void
-xfs_inobt_log_recs(
- xfs_btree_cur_t *cur, /* btree cursor */
- xfs_buf_t *bp, /* buffer containing btree block */
- int rfirst, /* index of first record to log */
- int rlast) /* index of last record to log */
-{
- xfs_inobt_block_t *block; /* btree block to log from */
- int first; /* first byte offset logged */
- int last; /* last byte offset logged */
- xfs_inobt_rec_t *rp; /* record pointer for btree block */
-
- block = XFS_BUF_TO_INOBT_BLOCK(bp);
- rp = XFS_INOBT_REC_ADDR(block, 1, cur);
- first = (int)((xfs_caddr_t)&rp[rfirst - 1] - (xfs_caddr_t)block);
- last = (int)(((xfs_caddr_t)&rp[rlast] - 1) - (xfs_caddr_t)block);
- xfs_trans_log_buf(cur->bc_tp, bp, first, last);
-}
-
-
-/*
- * Externally visible routines.
- */
-
-/*
- * Delete the record pointed to by cur.
- * The cursor refers to the place where the record was (could be inserted)
- * when the operation returns.
- */
-int /* error */
-xfs_inobt_delete(
- xfs_btree_cur_t *cur, /* btree cursor */
- int *stat) /* success/failure */
-{
- int error;
- int i; /* result code */
- int level; /* btree level */
-
- /*
- * Go up the tree, starting at leaf level.
- * If 2 is returned then a join was done; go to the next level.
- * Otherwise we are done.
- */
- for (level = 0, i = 2; i == 2; level++) {
- if ((error = xfs_inobt_delrec(cur, level, &i)))
- return error;
- }
- if (i == 0) {
- for (level = 1; level < cur->bc_nlevels; level++) {
- if (cur->bc_ptrs[level] == 0) {
- if ((error = xfs_btree_decrement(cur, level, &i)))
- return error;
- break;
- }
- }
- }
- *stat = i;
- return 0;
-}
-
/*
* Get the data from the pointed-to record.
@@ -690,6 +85,13 @@
return 0;
}
+STATIC int
+xfs_inobt_get_minrecs(
+ struct xfs_btree_cur *cur,
+ int level)
+{
+ return cur->bc_mp->m_inobt_mnr[level != 0];
+}
STATIC struct xfs_btree_cur *
xfs_inobt_dup_cursor(
@@ -829,6 +231,38 @@
cur->bc_rec.i.ir_startino;
}
+STATIC int
+xfs_inobt_kill_root(
+ struct xfs_btree_cur *cur,
+ struct xfs_buf *bp,
+ int level,
+ union xfs_btree_ptr *newroot)
+{
+ int error;
+
+ XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);
+ XFS_BTREE_STATS_INC(cur, killroot);
+
+ /*
+ * Update the root pointer, decreasing the level by 1 and then
+ * free the old root.
+ */
+ xfs_inobt_set_root(cur, newroot, -1);
+ error = xfs_inobt_free_block(cur, bp);
+ if (error) {
+ XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
+ return error;
+ }
+
+ XFS_BTREE_STATS_INC(cur, free);
+
+ cur->bc_bufs[level] = NULL;
+ cur->bc_nlevels--;
+
+ XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
+ return 0;
+}
+
#ifdef XFS_BTREE_TRACE
ktrace_t *xfs_inobt_trace_buf;
@@ -901,8 +335,10 @@
.dup_cursor = xfs_inobt_dup_cursor,
.set_root = xfs_inobt_set_root,
+ .kill_root = xfs_inobt_kill_root,
.alloc_block = xfs_inobt_alloc_block,
.free_block = xfs_inobt_free_block,
+ .get_minrecs = xfs_inobt_get_minrecs,
.get_maxrecs = xfs_inobt_get_maxrecs,
.init_key_from_rec = xfs_inobt_init_key_from_rec,
.init_rec_from_key = xfs_inobt_init_rec_from_key,