Linux-2.6.12-rc2

Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.

Let it rip!

1 files changed, 2204 insertions, 0 deletions

diff --git a/fs/xfs/xfs_alloc_btree.c b/fs/xfs/xfs_alloc_btree.c
new file mode 100644
index 0000000..e0355a1
--- /dev/null
+++ b/fs/xfs/xfs_alloc_btree.c
@@ -0,0 +1,2204 @@
+/*
+ * Copyright (c) 2000-2001 Silicon Graphics, Inc.  All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * Further, this software is distributed without any warranty that it is
+ * free of the rightful claim of any third person regarding infringement
+ * or the like.  Any license provided herein, whether implied or
+ * otherwise, applies only to this software file.  Patent licenses, if
+ * any, provided herein do not apply to combinations of this program with
+ * other software, or any other product whatsoever.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write the Free Software Foundation, Inc., 59
+ * Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ *
+ * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
+ * Mountain View, CA  94043, or:
+ *
+ * http://www.sgi.com
+ *
+ * For further information regarding this notice, see:
+ *
+ * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
+ */
+
+/*
+ * Free space allocation for XFS.
+ */
+
+#include "xfs.h"
+#include "xfs_macros.h"
+#include "xfs_types.h"
+#include "xfs_inum.h"
+#include "xfs_log.h"
+#include "xfs_trans.h"
+#include "xfs_sb.h"
+#include "xfs_ag.h"
+#include "xfs_dir.h"
+#include "xfs_dmapi.h"
+#include "xfs_mount.h"
+#include "xfs_alloc_btree.h"
+#include "xfs_ialloc_btree.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_btree.h"
+#include "xfs_ialloc.h"
+#include "xfs_alloc.h"
+#include "xfs_error.h"
+
+/*
+ * Prototypes for internal functions.
+ */
+
+STATIC void xfs_alloc_log_block(xfs_trans_t *, xfs_buf_t *, int);
+STATIC void xfs_alloc_log_keys(xfs_btree_cur_t *, xfs_buf_t *, int, int);
+STATIC void xfs_alloc_log_ptrs(xfs_btree_cur_t *, xfs_buf_t *, int, int);
+STATIC void xfs_alloc_log_recs(xfs_btree_cur_t *, xfs_buf_t *, int, int);
+STATIC int xfs_alloc_lshift(xfs_btree_cur_t *, int, int *);
+STATIC int xfs_alloc_newroot(xfs_btree_cur_t *, int *);
+STATIC int xfs_alloc_rshift(xfs_btree_cur_t *, int, int *);
+STATIC int xfs_alloc_split(xfs_btree_cur_t *, int, xfs_agblock_t *,
+		xfs_alloc_key_t *, xfs_btree_cur_t **, int *);
+STATIC int xfs_alloc_updkey(xfs_btree_cur_t *, xfs_alloc_key_t *, int);
+
+/*
+ * Internal functions.
+ */
+
+/*
+ * Single level of the xfs_alloc_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_alloc_delrec(
+	xfs_btree_cur_t		*cur,	/* btree cursor */
+	int			level,	/* level removing record from */
+	int			*stat)	/* fail/done/go-on */
+{
+	xfs_agf_t		*agf;	/* allocation group freelist header */
+	xfs_alloc_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_alloc_key_t		key;	/* kp points here if block is level 0 */
+	xfs_agblock_t		lbno;	/* left block's block number */
+	xfs_buf_t		*lbp;	/* left block's buffer pointer */
+	xfs_alloc_block_t	*left;	/* left btree block */
+	xfs_alloc_key_t		*lkp=NULL;	/* left block key pointer */
+	xfs_alloc_ptr_t		*lpp=NULL;	/* left block address pointer */
+	int			lrecs=0;	/* number of records in left block */
+	xfs_alloc_rec_t		*lrp;	/* left block record pointer */
+	xfs_mount_t		*mp;	/* mount structure */
+	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_alloc_block_t	*right;	/* right btree block */
+	xfs_alloc_key_t		*rkp;	/* right block key pointer */
+	xfs_alloc_ptr_t		*rpp;	/* right block address pointer */
+	int			rrecs=0;	/* number of records in right block */
+	xfs_alloc_rec_t		*rrp;	/* right block record pointer */
+	xfs_btree_cur_t		*tcur;	/* temporary btree cursor */
+
+	/*
+	 * 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_ALLOC_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.
+	 */
+	if (ptr > INT_GET(block->bb_numrecs, ARCH_CONVERT)) {
+		*stat = 0;
+		return 0;
+	}
+	XFS_STATS_INC(xs_abt_delrec);
+	/*
+	 * 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) {
+		lkp = XFS_ALLOC_KEY_ADDR(block, 1, cur);
+		lpp = XFS_ALLOC_PTR_ADDR(block, 1, cur);
+#ifdef DEBUG
+		for (i = ptr; i < INT_GET(block->bb_numrecs, ARCH_CONVERT); i++) {
+			if ((error = xfs_btree_check_sptr(cur, INT_GET(lpp[i], ARCH_CONVERT), level)))
+				return error;
+		}
+#endif
+		if (ptr < INT_GET(block->bb_numrecs, ARCH_CONVERT)) {
+			memmove(&lkp[ptr - 1], &lkp[ptr],
+				(INT_GET(block->bb_numrecs, ARCH_CONVERT) - ptr) * sizeof(*lkp)); /* INT_: mem copy */
+			memmove(&lpp[ptr - 1], &lpp[ptr],
+				(INT_GET(block->bb_numrecs, ARCH_CONVERT) - ptr) * sizeof(*lpp)); /* INT_: mem copy */
+			xfs_alloc_log_ptrs(cur, bp, ptr, INT_GET(block->bb_numrecs, ARCH_CONVERT) - 1);
+			xfs_alloc_log_keys(cur, bp, ptr, INT_GET(block->bb_numrecs, ARCH_CONVERT) - 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 {
+		lrp = XFS_ALLOC_REC_ADDR(block, 1, cur);
+		if (ptr < INT_GET(block->bb_numrecs, ARCH_CONVERT)) {
+			memmove(&lrp[ptr - 1], &lrp[ptr],
+				(INT_GET(block->bb_numrecs, ARCH_CONVERT) - ptr) * sizeof(*lrp));
+			xfs_alloc_log_recs(cur, bp, ptr, INT_GET(block->bb_numrecs, ARCH_CONVERT) - 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.ar_startblock = lrp->ar_startblock; /* INT_: direct copy */
+			key.ar_blockcount = lrp->ar_blockcount; /* INT_: direct copy */
+			lkp = &key;
+		}
+	}
+	/*
+	 * Decrement and log the number of entries in the block.
+	 */
+	INT_MOD(block->bb_numrecs, ARCH_CONVERT, -1);
+	xfs_alloc_log_block(cur->bc_tp, bp, XFS_BB_NUMRECS);
+	/*
+	 * See if the longest free extent in the allocation group was
+	 * changed by this operation.  True if it's the by-size btree, and
+	 * this is the leaf level, and there is no right sibling block,
+	 * and this was the last record.
+	 */
+	agf = XFS_BUF_TO_AGF(cur->bc_private.a.agbp);
+	mp = cur->bc_mp;
+
+	if (level == 0 &&
+	    cur->bc_btnum == XFS_BTNUM_CNT &&
+	    INT_GET(block->bb_rightsib, ARCH_CONVERT) == NULLAGBLOCK &&
+	    ptr > INT_GET(block->bb_numrecs, ARCH_CONVERT)) {
+		ASSERT(ptr == INT_GET(block->bb_numrecs, ARCH_CONVERT) + 1);
+		/*
+		 * There are still records in the block.  Grab the size
+		 * from the last one.
+		 */
+		if (INT_GET(block->bb_numrecs, ARCH_CONVERT)) {
+			rrp = XFS_ALLOC_REC_ADDR(block, INT_GET(block->bb_numrecs, ARCH_CONVERT), cur);
+			INT_COPY(agf->agf_longest, rrp->ar_blockcount, ARCH_CONVERT);
+		}
+		/*
+		 * No free extents left.
+		 */
+		else
+			agf->agf_longest = 0;
+		mp->m_perag[INT_GET(agf->agf_seqno, ARCH_CONVERT)].pagf_longest =
+			INT_GET(agf->agf_longest, ARCH_CONVERT);
+		xfs_alloc_log_agf(cur->bc_tp, cur->bc_private.a.agbp,
+			XFS_AGF_LONGEST);
+	}
+	/*
+	 * 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 (INT_GET(block->bb_numrecs, ARCH_CONVERT) == 1 && level > 0) {
+			/*
+			 * lpp is still set to the first pointer in the block.
+			 * Make it the new root of the btree.
+			 */
+			bno = INT_GET(agf->agf_roots[cur->bc_btnum], ARCH_CONVERT);
+			INT_COPY(agf->agf_roots[cur->bc_btnum], *lpp, ARCH_CONVERT);
+			INT_MOD(agf->agf_levels[cur->bc_btnum], ARCH_CONVERT, -1);
+			mp->m_perag[INT_GET(agf->agf_seqno, ARCH_CONVERT)].pagf_levels[cur->bc_btnum]--;
+			/*
+			 * Put this buffer/block on the ag's freelist.
+			 */
+			if ((error = xfs_alloc_put_freelist(cur->bc_tp,
+					cur->bc_private.a.agbp, NULL, bno)))
+				return error;
+			/*
+			 * Since blocks move to the free list without the
+			 * coordination used in xfs_bmap_finish, we can't allow
+			 * block to be available for reallocation and
+			 * non-transaction writing (user data) until we know
+			 * that the transaction that moved it to the free list
+			 * is permanently on disk. We track the blocks by
+			 * declaring these blocks as "busy"; the busy list is
+			 * maintained on a per-ag basis and each transaction
+			 * records which entries should be removed when the
+			 * iclog commits to disk. If a busy block is
+			 * allocated, the iclog is pushed up to the LSN
+			 * that freed the block.
+			 */
+			xfs_alloc_mark_busy(cur->bc_tp,
+				INT_GET(agf->agf_seqno, ARCH_CONVERT), bno, 1);
+
+			xfs_trans_agbtree_delta(cur->bc_tp, -1);
+			xfs_alloc_log_agf(cur->bc_tp, cur->bc_private.a.agbp,
+				XFS_AGF_ROOTS | XFS_AGF_LEVELS);
+			/*
+			 * Update the cursor so there's one fewer level.
+			 */
+			xfs_btree_setbuf(cur, level, NULL);
+			cur->bc_nlevels--;
+		} else if (level > 0 &&
+			   (error = xfs_alloc_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_alloc_updkey(cur, lkp, level + 1)))
+		return error;
+	/*
+	 * If the number of records remaining in the block is at least
+	 * the minimum, we're done.
+	 */
+	if (INT_GET(block->bb_numrecs, ARCH_CONVERT) >= XFS_ALLOC_BLOCK_MINRECS(level, cur)) {
+		if (level > 0 && (error = xfs_alloc_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 = INT_GET(block->bb_rightsib, ARCH_CONVERT);
+	lbno = INT_GET(block->bb_leftsib, ARCH_CONVERT);
+	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_alloc_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_ALLOC_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 = INT_GET(right->bb_leftsib, ARCH_CONVERT);
+		/*
+		 * 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 (INT_GET(right->bb_numrecs, ARCH_CONVERT) - 1 >=
+		     XFS_ALLOC_BLOCK_MINRECS(level, cur)) {
+			if ((error = xfs_alloc_lshift(tcur, level, &i)))
+				goto error0;
+			if (i) {
+				ASSERT(INT_GET(block->bb_numrecs, ARCH_CONVERT) >=
+				       XFS_ALLOC_BLOCK_MINRECS(level, cur));
+				xfs_btree_del_cursor(tcur,
+						     XFS_BTREE_NOERROR);
+				if (level > 0 &&
+				    (error = xfs_alloc_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 = INT_GET(right->bb_numrecs, ARCH_CONVERT);
+		if (lbno != NULLAGBLOCK) {
+			i = xfs_btree_firstrec(tcur, level);
+			XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
+			if ((error = xfs_alloc_decrement(tcur, level, &i)))
+				goto error0;
+			XFS_WANT_CORRUPTED_GOTO(i == 1, 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.
+		 */
+		i = xfs_btree_firstrec(tcur, level);
+		XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
+		if ((error = xfs_alloc_decrement(tcur, level, &i)))
+			goto error0;
+		XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
+		xfs_btree_firstrec(tcur, level);
+		/*
+		 * Grab a pointer to the block.
+		 */
+		lbp = tcur->bc_bufs[level];
+		left = XFS_BUF_TO_ALLOC_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 = INT_GET(left->bb_rightsib, ARCH_CONVERT);
+		/*
+		 * 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 (INT_GET(left->bb_numrecs, ARCH_CONVERT) - 1 >=
+		     XFS_ALLOC_BLOCK_MINRECS(level, cur)) {
+			if ((error = xfs_alloc_rshift(tcur, level, &i)))
+				goto error0;
+			if (i) {
+				ASSERT(INT_GET(block->bb_numrecs, ARCH_CONVERT) >=
+				       XFS_ALLOC_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 = INT_GET(left->bb_numrecs, ARCH_CONVERT);
+	}
+	/*
+	 * 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 + INT_GET(block->bb_numrecs, ARCH_CONVERT) <= XFS_ALLOC_BLOCK_MAXRECS(level, cur)) {
+		/*
+		 * Set "right" to be the starting block,
+		 * "left" to be the left neighbor.
+		 */
+		rbno = bno;
+		right = block;
+		rbp = bp;
+		if ((error = xfs_btree_read_bufs(mp, cur->bc_tp,
+				cur->bc_private.a.agno, lbno, 0, &lbp,
+				XFS_ALLOC_BTREE_REF)))
+			return error;
+		left = XFS_BUF_TO_ALLOC_BLOCK(lbp);
+		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 + INT_GET(block->bb_numrecs, ARCH_CONVERT) <=
+		  XFS_ALLOC_BLOCK_MAXRECS(level, cur)) {
+		/*
+		 * Set "left" to be the starting block,
+		 * "right" to be the right neighbor.
+		 */
+		lbno = bno;
+		left = block;
+		lbp = bp;
+		if ((error = xfs_btree_read_bufs(mp, cur->bc_tp,
+				cur->bc_private.a.agno, rbno, 0, &rbp,
+				XFS_ALLOC_BTREE_REF)))
+			return error;
+		right = XFS_BUF_TO_ALLOC_BLOCK(rbp);
+		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_alloc_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_ALLOC_KEY_ADDR(left, INT_GET(left->bb_numrecs, ARCH_CONVERT) + 1, cur);
+		lpp = XFS_ALLOC_PTR_ADDR(left, INT_GET(left->bb_numrecs, ARCH_CONVERT) + 1, cur);
+		rkp = XFS_ALLOC_KEY_ADDR(right, 1, cur);
+		rpp = XFS_ALLOC_PTR_ADDR(right, 1, cur);
+#ifdef DEBUG
+		for (i = 0; i < INT_GET(right->bb_numrecs, ARCH_CONVERT); i++) {
+			if ((error = xfs_btree_check_sptr(cur, INT_GET(rpp[i], ARCH_CONVERT), level)))
+				return error;
+		}
+#endif
+		memcpy(lkp, rkp, INT_GET(right->bb_numrecs, ARCH_CONVERT) * sizeof(*lkp)); /* INT_: structure copy */
+		memcpy(lpp, rpp, INT_GET(right->bb_numrecs, ARCH_CONVERT) * sizeof(*lpp)); /* INT_: structure copy */
+		xfs_alloc_log_keys(cur, lbp, INT_GET(left->bb_numrecs, ARCH_CONVERT) + 1,
+				   INT_GET(left->bb_numrecs, ARCH_CONVERT) + INT_GET(right->bb_numrecs, ARCH_CONVERT));
+		xfs_alloc_log_ptrs(cur, lbp, INT_GET(left->bb_numrecs, ARCH_CONVERT) + 1,
+				   INT_GET(left->bb_numrecs, ARCH_CONVERT) + INT_GET(right->bb_numrecs, ARCH_CONVERT));
+	} else {
+		/*
+		 * It's a leaf.  Move records.
+		 */
+		lrp = XFS_ALLOC_REC_ADDR(left, INT_GET(left->bb_numrecs, ARCH_CONVERT) + 1, cur);
+		rrp = XFS_ALLOC_REC_ADDR(right, 1, cur);
+		memcpy(lrp, rrp, INT_GET(right->bb_numrecs, ARCH_CONVERT) * sizeof(*lrp));
+		xfs_alloc_log_recs(cur, lbp, INT_GET(left->bb_numrecs, ARCH_CONVERT) + 1,
+				   INT_GET(left->bb_numrecs, ARCH_CONVERT) + INT_GET(right->bb_numrecs, ARCH_CONVERT));
+	}
+	/*
+	 * 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] += INT_GET(left->bb_numrecs, ARCH_CONVERT);
+	}
+	/*
+	 * 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_alloc_increment(cur, level + 1, &i)))
+		return error;
+	/*
+	 * Fix up the number of records in the surviving block.
+	 */
+	INT_MOD(left->bb_numrecs, ARCH_CONVERT, INT_GET(right->bb_numrecs, ARCH_CONVERT));
+	/*
+	 * Fix up the right block pointer in the surviving block, and log it.
+	 */
+	left->bb_rightsib = right->bb_rightsib; /* INT_: direct copy */
+	xfs_alloc_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 (INT_GET(left->bb_rightsib, ARCH_CONVERT) != NULLAGBLOCK) {
+		xfs_alloc_block_t	*rrblock;
+		xfs_buf_t		*rrbp;
+
+		if ((error = xfs_btree_read_bufs(mp, cur->bc_tp,
+				cur->bc_private.a.agno, INT_GET(left->bb_rightsib, ARCH_CONVERT), 0,
+				&rrbp, XFS_ALLOC_BTREE_REF)))
+			return error;
+		rrblock = XFS_BUF_TO_ALLOC_BLOCK(rrbp);
+		if ((error = xfs_btree_check_sblock(cur, rrblock, level, rrbp)))
+			return error;
+		INT_SET(rrblock->bb_leftsib, ARCH_CONVERT, lbno);
+		xfs_alloc_log_block(cur->bc_tp, rrbp, XFS_BB_LEFTSIB);
+	}
+	/*
+	 * Free the deleting block by putting it on the freelist.
+	 */
+	if ((error = xfs_alloc_put_freelist(cur->bc_tp, cur->bc_private.a.agbp,
+			NULL, rbno)))
+		return error;
+	/*
+	 * Since blocks move to the free list without the coordination
+	 * used in xfs_bmap_finish, we can't allow block to be available
+	 * for reallocation and non-transaction writing (user data)
+	 * until we know that the transaction that moved it to the free
+	 * list is permanently on disk. We track the blocks by declaring
+	 * these blocks as "busy"; the busy list is maintained on a
+	 * per-ag basis and each transaction records which entries
+	 * should be removed when the iclog commits to disk. If a
+	 * busy block is allocated, the iclog is pushed up to the
+	 * LSN that freed the block.
+	 */
+	xfs_alloc_mark_busy(cur->bc_tp,
+		INT_GET(agf->agf_seqno, ARCH_CONVERT), bno, 1);
+
+	xfs_trans_agbtree_delta(cur->bc_tp, -1);
+	/*
+	 * Adjust the current level's cursor so that we're left referring
+	 * to the right node, after we're done.
+	 * If this leaves the ptr value 0 our caller will fix it 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;
+}
+
+/*
+ * Insert one record/level.  Return information to the caller
+ * allowing the next level up to proceed if necessary.
+ */
+STATIC int				/* error */
+xfs_alloc_insrec(
+	xfs_btree_cur_t		*cur,	/* btree cursor */
+	int			level,	/* level to insert record at */
+	xfs_agblock_t		*bnop,	/* i/o: block number inserted */
+	xfs_alloc_rec_t		*recp,	/* i/o: record data inserted */
+	xfs_btree_cur_t		**curp,	/* output: new cursor replacing cur */
+	int			*stat)	/* output: success/failure */
+{
+	xfs_agf_t		*agf;	/* allocation group freelist header */
+	xfs_alloc_block_t	*block;	/* btree block record/key lives in */
+	xfs_buf_t		*bp;	/* buffer for block */
+	int			error;	/* error return value */
+	int			i;	/* loop index */
+	xfs_alloc_key_t		key;	/* key value being inserted */
+	xfs_alloc_key_t		*kp;	/* pointer to btree keys */
+	xfs_agblock_t		nbno;	/* block number of allocated block */
+	xfs_btree_cur_t		*ncur;	/* new cursor to be used at next lvl */
+	xfs_alloc_key_t		nkey;	/* new key value, from split */
+	xfs_alloc_rec_t		nrec;	/* new record value, for caller */
+	int			optr;	/* old ptr value */
+	xfs_alloc_ptr_t		*pp;	/* pointer to btree addresses */
+	int			ptr;	/* index in btree block for this rec */
+	xfs_alloc_rec_t		*rp;	/* pointer to btree records */
+
+	ASSERT(INT_GET(recp->ar_blockcount, ARCH_CONVERT) > 0);
+	/*
+	 * If we made it to the root level, allocate a new root block
+	 * and we're done.
+	 */
+	if (level >= cur->bc_nlevels) {
+		XFS_STATS_INC(xs_abt_insrec);
+		if ((error = xfs_alloc_newroot(cur, &i)))
+			return error;
+		*bnop = NULLAGBLOCK;
+		*stat = i;
+		return 0;
+	}
+	/*
+	 * Make a key out of the record data to be inserted, and save it.
+	 */
+	key.ar_startblock = recp->ar_startblock; /* INT_: direct copy */
+	key.ar_blockcount = recp->ar_blockcount; /* INT_: direct copy */
+	optr = ptr = cur->bc_ptrs[level];
+	/*
+	 * If we're off the left edge, return failure.
+	 */
+	if (ptr == 0) {
+		*stat = 0;
+		return 0;
+	}
+	XFS_STATS_INC(xs_abt_insrec);
+	/*
+	 * Get pointers to the btree buffer and block.
+	 */
+	bp = cur->bc_bufs[level];
+	block = XFS_BUF_TO_ALLOC_BLOCK(bp);
+#ifdef DEBUG
+	if ((error = xfs_btree_check_sblock(cur, block, level, bp)))
+		return error;
+	/*
+	 * Check that the new entry is being inserted in the right place.
+	 */
+	if (ptr <= INT_GET(block->bb_numrecs, ARCH_CONVERT)) {
+		if (level == 0) {
+			rp = XFS_ALLOC_REC_ADDR(block, ptr, cur);
+			xfs_btree_check_rec(cur->bc_btnum, recp, rp);
+		} else {
+			kp = XFS_ALLOC_KEY_ADDR(block, ptr, cur);
+			xfs_btree_check_key(cur->bc_btnum, &key, kp);
+		}
+	}
+#endif
+	nbno = NULLAGBLOCK;
+	ncur = (xfs_btree_cur_t *)0;
+	/*
+	 * If the block is full, we can't insert the new entry until we
+	 * make the block un-full.
+	 */
+	if (INT_GET(block->bb_numrecs, ARCH_CONVERT) == XFS_ALLOC_BLOCK_MAXRECS(level, cur)) {
+		/*
+		 * First, try shifting an entry to the right neighbor.
+		 */
+		if ((error = xfs_alloc_rshift(cur, level, &i)))
+			return error;
+		if (i) {
+			/* nothing */
+		}
+		/*
+		 * Next, try shifting an entry to the left neighbor.
+		 */
+		else {
+			if ((error = xfs_alloc_lshift(cur, level, &i)))
+				return error;
+			if (i)
+				optr = ptr = cur->bc_ptrs[level];
+			else {
+				/*
+				 * Next, try splitting the current block in
+				 * half. If this works we have to re-set our
+				 * variables because we could be in a
+				 * different block now.
+				 */
+				if ((error = xfs_alloc_split(cur, level, &nbno,
+						&nkey, &ncur, &i)))
+					return error;
+				if (i) {
+					bp = cur->bc_bufs[level];
+					block = XFS_BUF_TO_ALLOC_BLOCK(bp);
+#ifdef DEBUG
+					if ((error =
+						xfs_btree_check_sblock(cur,
+							block, level, bp)))
+						return error;
+#endif
+					ptr = cur->bc_ptrs[level];
+					nrec.ar_startblock = nkey.ar_startblock; /* INT_: direct copy */
+					nrec.ar_blockcount = nkey.ar_blockcount; /* INT_: direct copy */
+				}
+				/*
+				 * Otherwise the insert fails.
+				 */
+				else {
+					*stat = 0;
+					return 0;
+				}
+			}
+		}
+	}
+	/*
+	 * At this point we know there's room for our new entry in the block
+	 * we're pointing at.
+	 */
+	if (level > 0) {
+		/*
+		 * It's a non-leaf entry.  Make a hole for the new data
+		 * in the key and ptr regions of the block.
+		 */
+		kp = XFS_ALLOC_KEY_ADDR(block, 1, cur);
+		pp = XFS_ALLOC_PTR_ADDR(block, 1, cur);
+#ifdef DEBUG
+		for (i = INT_GET(block->bb_numrecs, ARCH_CONVERT); i >= ptr; i--) {
+			if ((error = xfs_btree_check_sptr(cur, INT_GET(pp[i - 1], ARCH_CONVERT), level)))
+				return error;
+		}
+#endif
+		memmove(&kp[ptr], &kp[ptr - 1],
+			(INT_GET(block->bb_numrecs, ARCH_CONVERT) - ptr + 1) * sizeof(*kp)); /* INT_: copy */
+		memmove(&pp[ptr], &pp[ptr - 1],
+			(INT_GET(block->bb_numrecs, ARCH_CONVERT) - ptr + 1) * sizeof(*pp)); /* INT_: copy */
+#ifdef DEBUG
+		if ((error = xfs_btree_check_sptr(cur, *bnop, level)))
+			return error;
+#endif
+		/*
+		 * Now stuff the new data in, bump numrecs and log the new data.
+		 */
+		kp[ptr - 1] = key;
+		INT_SET(pp[ptr - 1], ARCH_CONVERT, *bnop);
+		INT_MOD(block->bb_numrecs, ARCH_CONVERT, +1);
+		xfs_alloc_log_keys(cur, bp, ptr, INT_GET(block->bb_numrecs, ARCH_CONVERT));
+		xfs_alloc_log_ptrs(cur, bp, ptr, INT_GET(block->bb_numrecs, ARCH_CONVERT));
+#ifdef DEBUG
+		if (ptr < INT_GET(block->bb_numrecs, ARCH_CONVERT))
+			xfs_btree_check_key(cur->bc_btnum, kp + ptr - 1,
+				kp + ptr);
+#endif
+	} else {
+		/*
+		 * It's a leaf entry.  Make a hole for the new record.
+		 */
+		rp = XFS_ALLOC_REC_ADDR(block, 1, cur);
+		memmove(&rp[ptr], &rp[ptr - 1],
+			(INT_GET(block->bb_numrecs, ARCH_CONVERT) - ptr + 1) * sizeof(*rp));
+		/*
+		 * Now stuff the new record in, bump numrecs
+		 * and log the new data.
+		 */
+		rp[ptr - 1] = *recp; /* INT_: struct copy */
+		INT_MOD(block->bb_numrecs, ARCH_CONVERT, +1);
+		xfs_alloc_log_recs(cur, bp, ptr, INT_GET(block->bb_numrecs, ARCH_CONVERT));
+#ifdef DEBUG
+		if (ptr < INT_GET(block->bb_numrecs, ARCH_CONVERT))
+			xfs_btree_check_rec(cur->bc_btnum, rp + ptr - 1,
+				rp + ptr);
+#endif
+	}
+	/*
+	 * Log the new number of records in the btree header.
+	 */
+	xfs_alloc_log_block(cur->bc_tp, bp, XFS_BB_NUMRECS);
+	/*
+	 * If we inserted at the start of a block, update the parents' keys.
+	 */
+	if (optr == 1 && (error = xfs_alloc_updkey(cur, &key, level + 1)))
+		return error;
+	/*
+	 * Look to see if the longest extent in the allocation group
+	 * needs to be updated.
+	 */
+
+	agf = XFS_BUF_TO_AGF(cur->bc_private.a.agbp);
+	if (level == 0 &&
+	    cur->bc_btnum == XFS_BTNUM_CNT &&
+	    INT_GET(block->bb_rightsib, ARCH_CONVERT) == NULLAGBLOCK &&
+	    INT_GET(recp->ar_blockcount, ARCH_CONVERT) > INT_GET(agf->agf_longest, ARCH_CONVERT)) {
+		/*
+		 * If this is a leaf in the by-size btree and there
+		 * is no right sibling block and this block is bigger
+		 * than the previous longest block, update it.
+		 */
+		INT_COPY(agf->agf_longest, recp->ar_blockcount, ARCH_CONVERT);
+		cur->bc_mp->m_perag[INT_GET(agf->agf_seqno, ARCH_CONVERT)].pagf_longest
+			= INT_GET(recp->ar_blockcount, ARCH_CONVERT);
+		xfs_alloc_log_agf(cur->bc_tp, cur->bc_private.a.agbp,
+			XFS_AGF_LONGEST);
+	}
+	/*
+	 * Return the new block number, if any.
+	 * If there is one, give back a record value and a cursor too.
+	 */
+	*bnop = nbno;
+	if (nbno != NULLAGBLOCK) {
+		*recp = nrec; /* INT_: struct copy */
+		*curp = ncur; /* INT_: struct copy */
+	}
+	*stat = 1;
+	return 0;
+}
+
+/*
+ * Log header fields from a btree block.
+ */
+STATIC void
+xfs_alloc_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_alloc_block_t, bb_magic),
+		offsetof(xfs_alloc_block_t, bb_level),
+		offsetof(xfs_alloc_block_t, bb_numrecs),
+		offsetof(xfs_alloc_block_t, bb_leftsib),
+		offsetof(xfs_alloc_block_t, bb_rightsib),
+		sizeof(xfs_alloc_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_alloc_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_alloc_block_t	*block;	/* btree block to log from */
+	int			first;	/* first byte offset logged */
+	xfs_alloc_key_t		*kp;	/* key pointer in btree block */
+	int			last;	/* last byte offset logged */
+
+	block = XFS_BUF_TO_ALLOC_BLOCK(bp);
+	kp = XFS_ALLOC_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_alloc_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_alloc_block_t	*block;	/* btree block to log from */
+	int			first;	/* first byte offset logged */
+	int			last;	/* last byte offset logged */
+	xfs_alloc_ptr_t		*pp;	/* block-pointer pointer in btree blk */
+
+	block = XFS_BUF_TO_ALLOC_BLOCK(bp);
+	pp = XFS_ALLOC_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_alloc_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_alloc_block_t	*block;	/* btree block to log from */
+	int			first;	/* first byte offset logged */
+	int			last;	/* last byte offset logged */
+	xfs_alloc_rec_t		*rp;	/* record pointer for btree block */
+
+
+	block = XFS_BUF_TO_ALLOC_BLOCK(bp);
+	rp = XFS_ALLOC_REC_ADDR(block, 1, cur);
+#ifdef DEBUG
+	{
+		xfs_agf_t	*agf;
+		xfs_alloc_rec_t	*p;
+
+		agf = XFS_BUF_TO_AGF(cur->bc_private.a.agbp);
+		for (p = &rp[rfirst - 1]; p <= &rp[rlast - 1]; p++)
+			ASSERT(INT_GET(p->ar_startblock, ARCH_CONVERT) + INT_GET(p->ar_blockcount, ARCH_CONVERT) <=
+			       INT_GET(agf->agf_length, ARCH_CONVERT));
+	}
+#endif
+	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);
+}
+
+/*
+ * Lookup the record.  The cursor is made to point to it, based on dir.
+ * Return 0 if can't find any such record, 1 for success.
+ */
+STATIC int				/* error */
+xfs_alloc_lookup(
+	xfs_btree_cur_t		*cur,	/* btree cursor */
+	xfs_lookup_t		dir,	/* <=, ==, or >= */
+	int			*stat)	/* success/failure */
+{
+	xfs_agblock_t		agbno;	/* a.g. relative btree block number */
+	xfs_agnumber_t		agno;	/* allocation group number */
+	xfs_alloc_block_t	*block=NULL;	/* current btree block */
+	int			diff;	/* difference for the current key */
+	int			error;	/* error return value */
+	int			keyno=0;	/* current key number */
+	int			level;	/* level in the btree */
+	xfs_mount_t		*mp;	/* file system mount point */
+
+	XFS_STATS_INC(xs_abt_lookup);
+	/*
+	 * Get the allocation group header, and the root block number.
+	 */
+	mp = cur->bc_mp;
+
+	{
+		xfs_agf_t	*agf;	/* a.g. freespace header */
+
+		agf = XFS_BUF_TO_AGF(cur->bc_private.a.agbp);
+		agno = INT_GET(agf->agf_seqno, ARCH_CONVERT);
+		agbno = INT_GET(agf->agf_roots[cur->bc_btnum], ARCH_CONVERT);
+	}
+	/*
+	 * Iterate over each level in the btree, starting at the root.
+	 * For each level above the leaves, find the key we need, based
+	 * on the lookup record, then follow the corresponding block
+	 * pointer down to the next level.
+	 */
+	for (level = cur->bc_nlevels - 1, diff = 1; level >= 0; level--) {
+		xfs_buf_t	*bp;	/* buffer pointer for btree block */
+		xfs_daddr_t	d;	/* disk address of btree block */
+
+		/*
+		 * Get the disk address we're looking for.
+		 */
+		d = XFS_AGB_TO_DADDR(mp, agno, agbno);
+		/*
+		 * If the old buffer at this level is for a different block,
+		 * throw it away, otherwise just use it.
+		 */
+		bp = cur->bc_bufs[level];
+		if (bp && XFS_BUF_ADDR(bp) != d)
+			bp = (xfs_buf_t *)0;
+		if (!bp) {
+			/*
+			 * Need to get a new buffer.  Read it, then
+			 * set it in the cursor, releasing the old one.
+			 */
+			if ((error = xfs_btree_read_bufs(mp, cur->bc_tp, agno,
+					agbno, 0, &bp, XFS_ALLOC_BTREE_REF)))
+				return error;
+			xfs_btree_setbuf(cur, level, bp);
+			/*
+			 * Point to the btree block, now that we have the buffer
+			 */
+			block = XFS_BUF_TO_ALLOC_BLOCK(bp);
+			if ((error = xfs_btree_check_sblock(cur, block, level,
+					bp)))
+				return error;
+		} else
+			block = XFS_BUF_TO_ALLOC_BLOCK(bp);
+		/*
+		 * If we already had a key match at a higher level, we know
+		 * we need to use the first entry in this block.
+		 */
+		if (diff == 0)
+			keyno = 1;
+		/*
+		 * Otherwise we need to search this block.  Do a binary search.
+		 */
+		else {
+			int		high;	/* high entry number */
+			xfs_alloc_key_t	*kkbase=NULL;/* base of keys in block */
+			xfs_alloc_rec_t	*krbase=NULL;/* base of records in block */
+			int		low;	/* low entry number */
+
+			/*
+			 * Get a pointer to keys or records.
+			 */
+			if (level > 0)
+				kkbase = XFS_ALLOC_KEY_ADDR(block, 1, cur);
+			else
+				krbase = XFS_ALLOC_REC_ADDR(block, 1, cur);
+			/*
+			 * Set low and high entry numbers, 1-based.
+			 */
+			low = 1;
+			if (!(high = INT_GET(block->bb_numrecs, ARCH_CONVERT))) {
+				/*
+				 * If the block is empty, the tree must
+				 * be an empty leaf.
+				 */
+				ASSERT(level == 0 && cur->bc_nlevels == 1);
+				cur->bc_ptrs[0] = dir != XFS_LOOKUP_LE;
+				*stat = 0;
+				return 0;
+			}
+			/*
+			 * Binary search the block.
+			 */
+			while (low <= high) {
+				xfs_extlen_t	blockcount;	/* key value */
+				xfs_agblock_t	startblock;	/* key value */
+
+				XFS_STATS_INC(xs_abt_compare);
+				/*
+				 * keyno is average of low and high.
+				 */
+				keyno = (low + high) >> 1;
+				/*
+				 * Get startblock & blockcount.
+				 */
+				if (level > 0) {
+					xfs_alloc_key_t	*kkp;
+
+					kkp = kkbase + keyno - 1;
+					startblock = INT_GET(kkp->ar_startblock, ARCH_CONVERT);
+					blockcount = INT_GET(kkp->ar_blockcount, ARCH_CONVERT);
+				} else {
+					xfs_alloc_rec_t	*krp;
+
+					krp = krbase + keyno - 1;
+					startblock = INT_GET(krp->ar_startblock, ARCH_CONVERT);
+					blockcount = INT_GET(krp->ar_blockcount, ARCH_CONVERT);
+				}
+				/*
+				 * Compute difference to get next direction.
+				 */
+				if (cur->bc_btnum == XFS_BTNUM_BNO)
+					diff = (int)startblock -
+					       (int)cur->bc_rec.a.ar_startblock;
+				else if (!(diff = (int)blockcount -
+					    (int)cur->bc_rec.a.ar_blockcount))
+					diff = (int)startblock -
+					    (int)cur->bc_rec.a.ar_startblock;
+				/*
+				 * Less than, move right.
+				 */
+				if (diff < 0)
+					low = keyno + 1;
+				/*
+				 * Greater than, move left.
+				 */
+				else if (diff > 0)
+					high = keyno - 1;
+				/*
+				 * Equal, we're done.
+				 */
+				else
+					break;
+			}
+		}
+		/*
+		 * If there are more levels, set up for the next level
+		 * by getting the block number and filling in the cursor.
+		 */
+		if (level > 0) {
+			/*
+			 * If we moved left, need the previous key number,
+			 * unless there isn't one.
+			 */
+			if (diff > 0 && --keyno < 1)
+				keyno = 1;
+			agbno = INT_GET(*XFS_ALLOC_PTR_ADDR(block, keyno, cur), ARCH_CONVERT);
+#ifdef DEBUG
+			if ((error = xfs_btree_check_sptr(cur, agbno, level)))
+				return error;
+#endif
+			cur->bc_ptrs[level] = keyno;
+		}
+	}
+	/*
+	 * Done with the search.
+	 * See if we need to adjust the results.
+	 */
+	if (dir != XFS_LOOKUP_LE && diff < 0) {
+		keyno++;
+		/*
+		 * If ge search and we went off the end of the block, but it's
+		 * not the last block, we're in the wrong block.
+		 */
+		if (dir == XFS_LOOKUP_GE &&
+		    keyno > INT_GET(block->bb_numrecs, ARCH_CONVERT) &&
+		    INT_GET(block->bb_rightsib, ARCH_CONVERT) != NULLAGBLOCK) {
+			int	i;
+
+			cur->bc_ptrs[0] = keyno;
+			if ((error = xfs_alloc_increment(cur, 0, &i)))
+				return error;
+			XFS_WANT_CORRUPTED_RETURN(i == 1);
+			*stat = 1;
+			return 0;
+		}
+	}
+	else if (dir == XFS_LOOKUP_LE && diff > 0)
+		keyno--;
+	cur->bc_ptrs[0] = keyno;
+	/*
+	 * Return if we succeeded or not.
+	 */
+	if (keyno == 0 || keyno > INT_GET(block->bb_numrecs, ARCH_CONVERT))
+		*stat = 0;
+	else
+		*stat = ((dir != XFS_LOOKUP_EQ) || (diff == 0));
+	return 0;
+}
+
+/*
+ * Move 1 record left from cur/level if possible.
+ * Update cur to reflect the new path.
+ */
+STATIC int				/* error */
+xfs_alloc_lshift(
+	xfs_btree_cur_t		*cur,	/* btree cursor */
+	int			level,	/* level to shift record on */
+	int			*stat)	/* success/failure */
+{
+	int			error;	/* error return value */
+#ifdef DEBUG
+	int			i;	/* loop index */
+#endif
+	xfs_alloc_key_t		key;	/* key value for leaf level upward */
+	xfs_buf_t		*lbp;	/* buffer for left neighbor block */
+	xfs_alloc_block_t	*left;	/* left neighbor btree block */
+	int			nrec;	/* new number of left block entries */
+	xfs_buf_t		*rbp;	/* buffer for right (current) block */
+	xfs_alloc_block_t	*right;	/* right (current) btree block */
+	xfs_alloc_key_t		*rkp=NULL;	/* key pointer for right block */
+	xfs_alloc_ptr_t		*rpp=NULL;	/* address pointer for right block */
+	xfs_alloc_rec_t		*rrp=NULL;	/* record pointer for right block */
+
+	/*
+	 * Set up variables for this block as "right".
+	 */
+	rbp = cur->bc_bufs[level];
+	right = XFS_BUF_TO_ALLOC_BLOCK(rbp);
+#ifdef DEBUG
+	if ((error = xfs_btree_check_sblock(cur, right, level, rbp)))
+		return error;
+#endif
+	/*
+	 * If we've got no left sibling then we can't shift an entry left.
+	 */
+	if (INT_GET(right->bb_leftsib, ARCH_CONVERT) == NULLAGBLOCK) {
+		*stat = 0;
+		return 0;
+	}
+	/*
+	 * If the cursor entry is the one that would be moved, don't
+	 * do it... it's too complicated.
+	 */
+	if (cur->bc_ptrs[level] <= 1) {
+		*stat = 0;
+		return 0;
+	}
+	/*
+	 * Set up the left neighbor as "left".
+	 */
+	if ((error = xfs_btree_read_bufs(cur->bc_mp, cur->bc_tp,
+			cur->bc_private.a.agno, INT_GET(right->bb_leftsib, ARCH_CONVERT), 0, &lbp,
+			XFS_ALLOC_BTREE_REF)))
+		return error;
+	left = XFS_BUF_TO_ALLOC_BLOCK(lbp);
+	if ((error = xfs_btree_check_sblock(cur, left, level, lbp)))
+		return error;
+	/*
+	 * If it's full, it can't take another entry.
+	 */
+	if (INT_GET(left->bb_numrecs, ARCH_CONVERT) == XFS_ALLOC_BLOCK_MAXRECS(level, cur)) {
+		*stat = 0;
+		return 0;
+	}
+	nrec = INT_GET(left->bb_numrecs, ARCH_CONVERT) + 1;
+	/*
+	 * If non-leaf, copy a key and a ptr to the left block.
+	 */
+	if (level > 0) {
+		xfs_alloc_key_t	*lkp;	/* key pointer for left block */
+		xfs_alloc_ptr_t	*lpp;	/* address pointer for left block */
+
+		lkp = XFS_ALLOC_KEY_ADDR(left, nrec, cur);
+		rkp = XFS_ALLOC_KEY_ADDR(right, 1, cur);
+		*lkp = *rkp;
+		xfs_alloc_log_keys(cur, lbp, nrec, nrec);
+		lpp = XFS_ALLOC_PTR_ADDR(left, nrec, cur);
+		rpp = XFS_ALLOC_PTR_ADDR(right, 1, cur);
+#ifdef DEBUG
+		if ((error = xfs_btree_check_sptr(cur, INT_GET(*rpp, ARCH_CONVERT), level)))
+			return error;
+#endif
+		*lpp = *rpp; /* INT_: copy */
+		xfs_alloc_log_ptrs(cur, lbp, nrec, nrec);
+		xfs_btree_check_key(cur->bc_btnum, lkp - 1, lkp);
+	}
+	/*
+	 * If leaf, copy a record to the left block.
+	 */
+	else {
+		xfs_alloc_rec_t	*lrp;	/* record pointer for left block */
+
+		lrp = XFS_ALLOC_REC_ADDR(left, nrec, cur);
+		rrp = XFS_ALLOC_REC_ADDR(right, 1, cur);
+		*lrp = *rrp;
+		xfs_alloc_log_recs(cur, lbp, nrec, nrec);
+		xfs_btree_check_rec(cur->bc_btnum, lrp - 1, lrp);
+	}
+	/*
+	 * Bump and log left's numrecs, decrement and log right's numrecs.
+	 */
+	INT_MOD(left->bb_numrecs, ARCH_CONVERT, +1);
+	xfs_alloc_log_block(cur->bc_tp, lbp, XFS_BB_NUMRECS);
+	INT_MOD(right->bb_numrecs, ARCH_CONVERT, -1);
+	xfs_alloc_log_block(cur->bc_tp, rbp, XFS_BB_NUMRECS);
+	/*
+	 * Slide the contents of right down one entry.
+	 */
+	if (level > 0) {
+#ifdef DEBUG
+		for (i = 0; i < INT_GET(right->bb_numrecs, ARCH_CONVERT); i++) {
+			if ((error = xfs_btree_check_sptr(cur, INT_GET(rpp[i + 1], ARCH_CONVERT),
+					level)))
+				return error;
+		}
+#endif
+		memmove(rkp, rkp + 1, INT_GET(right->bb_numrecs, ARCH_CONVERT) * sizeof(*rkp));
+		memmove(rpp, rpp + 1, INT_GET(right->bb_numrecs, ARCH_CONVERT) * sizeof(*rpp));
+		xfs_alloc_log_keys(cur, rbp, 1, INT_GET(right->bb_numrecs, ARCH_CONVERT));
+		xfs_alloc_log_ptrs(cur, rbp, 1, INT_GET(right->bb_numrecs, ARCH_CONVERT));
+	} else {
+		memmove(rrp, rrp + 1, INT_GET(right->bb_numrecs, ARCH_CONVERT) * sizeof(*rrp));
+		xfs_alloc_log_recs(cur, rbp, 1, INT_GET(right->bb_numrecs, ARCH_CONVERT));
+		key.ar_startblock = rrp->ar_startblock; /* INT_: direct copy */
+		key.ar_blockcount = rrp->ar_blockcount; /* INT_: direct copy */
+		rkp = &key;
+	}
+	/*
+	 * Update the parent key values of right.
+	 */
+	if ((error = xfs_alloc_updkey(cur, rkp, level + 1)))
+		return error;
+	/*
+	 * Slide the cursor value left one.
+	 */
+	cur->bc_ptrs[level]--;
+	*stat = 1;
+	return 0;
+}
+
+/*
+ * Allocate a new root block, fill it in.
+ */
+STATIC int				/* error */
+xfs_alloc_newroot(
+	xfs_btree_cur_t		*cur,	/* btree cursor */
+	int			*stat)	/* success/failure */
+{
+	int			error;	/* error return value */
+	xfs_agblock_t		lbno;	/* left block number */
+	xfs_buf_t		*lbp;	/* left btree buffer */
+	xfs_alloc_block_t	*left;	/* left btree block */
+	xfs_mount_t		*mp;	/* mount structure */
+	xfs_agblock_t		nbno;	/* new block number */
+	xfs_buf_t		*nbp;	/* new (root) buffer */
+	xfs_alloc_block_t	*new;	/* new (root) btree block */
+	int			nptr;	/* new value for key index, 1 or 2 */
+	xfs_agblock_t		rbno;	/* right block number */
+	xfs_buf_t		*rbp;	/* right btree buffer */
+	xfs_alloc_block_t	*right;	/* right btree block */
+
+	mp = cur->bc_mp;
+
+	ASSERT(cur->bc_nlevels < XFS_AG_MAXLEVELS(mp));
+	/*
+	 * Get a buffer from the freelist blocks, for the new root.
+	 */
+	if ((error = xfs_alloc_get_freelist(cur->bc_tp, cur->bc_private.a.agbp,
+			&nbno)))
+		return error;
+	/*
+	 * None available, we fail.
+	 */
+	if (nbno == NULLAGBLOCK) {
+		*stat = 0;
+		return 0;
+	}
+	xfs_trans_agbtree_delta(cur->bc_tp, 1);
+	nbp = xfs_btree_get_bufs(mp, cur->bc_tp, cur->bc_private.a.agno, nbno,
+		0);
+	new = XFS_BUF_TO_ALLOC_BLOCK(nbp);
+	/*
+	 * Set the root data in the a.g. freespace structure.
+	 */
+	{
+		xfs_agf_t	*agf;	/* a.g. freespace header */
+		xfs_agnumber_t	seqno;
+
+		agf = XFS_BUF_TO_AGF(cur->bc_private.a.agbp);
+		INT_SET(agf->agf_roots[cur->bc_btnum], ARCH_CONVERT, nbno);
+		INT_MOD(agf->agf_levels[cur->bc_btnum], ARCH_CONVERT, 1);
+		seqno = INT_GET(agf->agf_seqno, ARCH_CONVERT);
+		mp->m_perag[seqno].pagf_levels[cur->bc_btnum]++;
+		xfs_alloc_log_agf(cur->bc_tp, cur->bc_private.a.agbp,
+			XFS_AGF_ROOTS | XFS_AGF_LEVELS);
+	}
+	/*
+	 * At the previous root level there are now two blocks: the old
+	 * root, and the new block generated when it was split.
+	 * We don't know which one the cursor is pointing at, so we
+	 * set up variables "left" and "right" for each case.
+	 */
+	lbp = cur->bc_bufs[cur->bc_nlevels - 1];
+	left = XFS_BUF_TO_ALLOC_BLOCK(lbp);
+#ifdef DEBUG
+	if ((error = xfs_btree_check_sblock(cur, left, cur->bc_nlevels - 1, lbp)))
+		return error;
+#endif
+	if (INT_GET(left->bb_rightsib, ARCH_CONVERT) != NULLAGBLOCK) {
+		/*
+		 * Our block is left, pick up the right block.
+		 */
+		lbno = XFS_DADDR_TO_AGBNO(mp, XFS_BUF_ADDR(lbp));
+		rbno = INT_GET(left->bb_rightsib, ARCH_CONVERT);
+		if ((error = xfs_btree_read_bufs(mp, cur->bc_tp,
+				cur->bc_private.a.agno, rbno, 0, &rbp,
+				XFS_ALLOC_BTREE_REF)))
+			return error;
+		right = XFS_BUF_TO_ALLOC_BLOCK(rbp);
+		if ((error = xfs_btree_check_sblock(cur, right,
+				cur->bc_nlevels - 1, rbp)))
+			return error;
+		nptr = 1;
+	} else {
+		/*
+		 * Our block is right, pick up the left block.
+		 */
+		rbp = lbp;
+		right = left;
+		rbno = XFS_DADDR_TO_AGBNO(mp, XFS_BUF_ADDR(rbp));
+		lbno = INT_GET(right->bb_leftsib, ARCH_CONVERT);
+		if ((error = xfs_btree_read_bufs(mp, cur->bc_tp,
+				cur->bc_private.a.agno, lbno, 0, &lbp,
+				XFS_ALLOC_BTREE_REF)))
+			return error;
+		left = XFS_BUF_TO_ALLOC_BLOCK(lbp);
+		if ((error = xfs_btree_check_sblock(cur, left,
+				cur->bc_nlevels - 1, lbp)))
+			return error;
+		nptr = 2;
+	}
+	/*
+	 * Fill in the new block's btree header and log it.
+	 */
+	INT_SET(new->bb_magic, ARCH_CONVERT, xfs_magics[cur->bc_btnum]);
+	INT_SET(new->bb_level, ARCH_CONVERT, (__uint16_t)cur->bc_nlevels);
+	INT_SET(new->bb_numrecs, ARCH_CONVERT, 2);
+	INT_SET(new->bb_leftsib, ARCH_CONVERT, NULLAGBLOCK);
+	INT_SET(new->bb_rightsib, ARCH_CONVERT, NULLAGBLOCK);
+	xfs_alloc_log_block(cur->bc_tp, nbp, XFS_BB_ALL_BITS);
+	ASSERT(lbno != NULLAGBLOCK && rbno != NULLAGBLOCK);
+	/*
+	 * Fill in the key data in the new root.
+	 */
+	{
+		xfs_alloc_key_t		*kp;	/* btree key pointer */
+
+		kp = XFS_ALLOC_KEY_ADDR(new, 1, cur);
+		if (INT_GET(left->bb_level, ARCH_CONVERT) > 0) {
+			kp[0] = *XFS_ALLOC_KEY_ADDR(left, 1, cur); /* INT_: structure copy */
+			kp[1] = *XFS_ALLOC_KEY_ADDR(right, 1, cur);/* INT_: structure copy */
+		} else {
+			xfs_alloc_rec_t	*rp;	/* btree record pointer */
+
+			rp = XFS_ALLOC_REC_ADDR(left, 1, cur);
+			kp[0].ar_startblock = rp->ar_startblock; /* INT_: direct copy */
+			kp[0].ar_blockcount = rp->ar_blockcount; /* INT_: direct copy */
+			rp = XFS_ALLOC_REC_ADDR(right, 1, cur);
+			kp[1].ar_startblock = rp->ar_startblock; /* INT_: direct copy */
+			kp[1].ar_blockcount = rp->ar_blockcount; /* INT_: direct copy */
+		}
+	}
+	xfs_alloc_log_keys(cur, nbp, 1, 2);
+	/*
+	 * Fill in the pointer data in the new root.
+	 */
+	{
+		xfs_alloc_ptr_t		*pp;	/* btree address pointer */
+
+		pp = XFS_ALLOC_PTR_ADDR(new, 1, cur);
+		INT_SET(pp[0], ARCH_CONVERT, lbno);
+		INT_SET(pp[1], ARCH_CONVERT, rbno);
+	}
+	xfs_alloc_log_ptrs(cur, nbp, 1, 2);
+	/*
+	 * Fix up the cursor.
+	 */
+	xfs_btree_setbuf(cur, cur->bc_nlevels, nbp);
+	cur->bc_ptrs[cur->bc_nlevels] = nptr;
+	cur->bc_nlevels++;
+	*stat = 1;
+	return 0;
+}
+
+/*
+ * Move 1 record right from cur/level if possible.
+ * Update cur to reflect the new path.
+ */
+STATIC int				/* error */
+xfs_alloc_rshift(
+	xfs_btree_cur_t		*cur,	/* btree cursor */
+	int			level,	/* level to shift record on */
+	int			*stat)	/* success/failure */
+{
+	int			error;	/* error return value */
+	int			i;	/* loop index */
+	xfs_alloc_key_t		key;	/* key value for leaf level upward */
+	xfs_buf_t		*lbp;	/* buffer for left (current) block */
+	xfs_alloc_block_t	*left;	/* left (current) btree block */
+	xfs_buf_t		*rbp;	/* buffer for right neighbor block */
+	xfs_alloc_block_t	*right;	/* right neighbor btree block */
+	xfs_alloc_key_t		*rkp;	/* key pointer for right block */
+	xfs_btree_cur_t		*tcur;	/* temporary cursor */
+
+	/*
+	 * Set up variables for this block as "left".
+	 */
+	lbp = cur->bc_bufs[level];
+	left = XFS_BUF_TO_ALLOC_BLOCK(lbp);
+#ifdef DEBUG
+	if ((error = xfs_btree_check_sblock(cur, left, level, lbp)))
+		return error;
+#endif
+	/*
+	 * If we've got no right sibling then we can't shift an entry right.
+	 */
+	if (INT_GET(left->bb_rightsib, ARCH_CONVERT) == NULLAGBLOCK) {
+		*stat = 0;
+		return 0;
+	}
+	/*
+	 * If the cursor entry is the one that would be moved, don't
+	 * do it... it's too complicated.
+	 */
+	if (cur->bc_ptrs[level] >= INT_GET(left->bb_numrecs, ARCH_CONVERT)) {
+		*stat = 0;
+		return 0;
+	}
+	/*
+	 * Set up the right neighbor as "right".
+	 */
+	if ((error = xfs_btree_read_bufs(cur->bc_mp, cur->bc_tp,
+			cur->bc_private.a.agno, INT_GET(left->bb_rightsib, ARCH_CONVERT), 0, &rbp,
+			XFS_ALLOC_BTREE_REF)))
+		return error;
+	right = XFS_BUF_TO_ALLOC_BLOCK(rbp);
+	if ((error = xfs_btree_check_sblock(cur, right, level, rbp)))
+		return error;
+	/*
+	 * If it's full, it can't take another entry.
+	 */
+	if (INT_GET(right->bb_numrecs, ARCH_CONVERT) == XFS_ALLOC_BLOCK_MAXRECS(level, cur)) {
+		*stat = 0;
+		return 0;
+	}
+	/*
+	 * Make a hole at the start of the right neighbor block, then
+	 * copy the last left block entry to the hole.
+	 */
+	if (level > 0) {
+		xfs_alloc_key_t	*lkp;	/* key pointer for left block */
+		xfs_alloc_ptr_t	*lpp;	/* address pointer for left block */
+		xfs_alloc_ptr_t	*rpp;	/* address pointer for right block */
+
+		lkp = XFS_ALLOC_KEY_ADDR(left, INT_GET(left->bb_numrecs, ARCH_CONVERT), cur);
+		lpp = XFS_ALLOC_PTR_ADDR(left, INT_GET(left->bb_numrecs, ARCH_CONVERT), cur);
+		rkp = XFS_ALLOC_KEY_ADDR(right, 1, cur);
+		rpp = XFS_ALLOC_PTR_ADDR(right, 1, cur);
+#ifdef DEBUG
+		for (i = INT_GET(right->bb_numrecs, ARCH_CONVERT) - 1; i >= 0; i--) {
+			if ((error = xfs_btree_check_sptr(cur, INT_GET(rpp[i], ARCH_CONVERT), level)))
+				return error;
+		}
+#endif
+		memmove(rkp + 1, rkp, INT_GET(right->bb_numrecs, ARCH_CONVERT) * sizeof(*rkp));
+		memmove(rpp + 1, rpp, INT_GET(right->bb_numrecs, ARCH_CONVERT) * sizeof(*rpp));
+#ifdef DEBUG
+		if ((error = xfs_btree_check_sptr(cur, INT_GET(*lpp, ARCH_CONVERT), level)))
+			return error;
+#endif
+		*rkp = *lkp; /* INT_: copy */
+		*rpp = *lpp; /* INT_: copy */
+		xfs_alloc_log_keys(cur, rbp, 1, INT_GET(right->bb_numrecs, ARCH_CONVERT) + 1);
+		xfs_alloc_log_ptrs(cur, rbp, 1, INT_GET(right->bb_numrecs, ARCH_CONVERT) + 1);
+		xfs_btree_check_key(cur->bc_btnum, rkp, rkp + 1);
+	} else {
+		xfs_alloc_rec_t	*lrp;	/* record pointer for left block */
+		xfs_alloc_rec_t	*rrp;	/* record pointer for right block */
+
+		lrp = XFS_ALLOC_REC_ADDR(left, INT_GET(left->bb_numrecs, ARCH_CONVERT), cur);
+		rrp = XFS_ALLOC_REC_ADDR(right, 1, cur);
+		memmove(rrp + 1, rrp, INT_GET(right->bb_numrecs, ARCH_CONVERT) * sizeof(*rrp));
+		*rrp = *lrp;
+		xfs_alloc_log_recs(cur, rbp, 1, INT_GET(right->bb_numrecs, ARCH_CONVERT) + 1);
+		key.ar_startblock = rrp->ar_startblock; /* INT_: direct copy */
+		key.ar_blockcount = rrp->ar_blockcount; /* INT_: direct copy */
+		rkp = &key;
+		xfs_btree_check_rec(cur->bc_btnum, rrp, rrp + 1);
+	}
+	/*
+	 * Decrement and log left's numrecs, bump and log right's numrecs.
+	 */
+	INT_MOD(left->bb_numrecs, ARCH_CONVERT, -1);
+	xfs_alloc_log_block(cur->bc_tp, lbp, XFS_BB_NUMRECS);
+	INT_MOD(right->bb_numrecs, ARCH_CONVERT, +1);
+	xfs_alloc_log_block(cur->bc_tp, rbp, XFS_BB_NUMRECS);
+	/*
+	 * Using a temporary cursor, update the parent key values of the
+	 * block on the right.
+	 */
+	if ((error = xfs_btree_dup_cursor(cur, &tcur)))
+		return error;
+	i = xfs_btree_lastrec(tcur, level);
+	XFS_WANT_CORRUPTED_GOTO(i == 1, error0);
+	if ((error = xfs_alloc_increment(tcur, level, &i)) ||
+	    (error = xfs_alloc_updkey(tcur, rkp, level + 1)))
+		goto error0;
+	xfs_btree_del_cursor(tcur, XFS_BTREE_NOERROR);
+	*stat = 1;
+	return 0;
+error0:
+	xfs_btree_del_cursor(tcur, XFS_BTREE_ERROR);
+	return error;
+}
+
+/*
+ * Split cur/level block in half.
+ * Return new block number and its first record (to be inserted into parent).
+ */
+STATIC int				/* error */
+xfs_alloc_split(
+	xfs_btree_cur_t		*cur,	/* btree cursor */
+	int			level,	/* level to split */
+	xfs_agblock_t		*bnop,	/* output: block number allocated */
+	xfs_alloc_key_t		*keyp,	/* output: first key of new block */
+	xfs_btree_cur_t		**curp,	/* output: new cursor */
+	int			*stat)	/* success/failure */
+{
+	int			error;	/* error return value */
+	int			i;	/* loop index/record number */
+	xfs_agblock_t		lbno;	/* left (current) block number */
+	xfs_buf_t		*lbp;	/* buffer for left block */
+	xfs_alloc_block_t	*left;	/* left (current) btree block */
+	xfs_agblock_t		rbno;	/* right (new) block number */
+	xfs_buf_t		*rbp;	/* buffer for right block */
+	xfs_alloc_block_t	*right;	/* right (new) btree block */
+
+	/*
+	 * Allocate the new block from the freelist.
+	 * If we can't do it, we're toast.  Give up.
+	 */
+	if ((error = xfs_alloc_get_freelist(cur->bc_tp, cur->bc_private.a.agbp,
+			&rbno)))
+		return error;
+	if (rbno == NULLAGBLOCK) {
+		*stat = 0;
+		return 0;
+	}
+	xfs_trans_agbtree_delta(cur->bc_tp, 1);
+	rbp = xfs_btree_get_bufs(cur->bc_mp, cur->bc_tp, cur->bc_private.a.agno,
+		rbno, 0);
+	/*
+	 * Set up the new block as "right".
+	 */
+	right = XFS_BUF_TO_ALLOC_BLOCK(rbp);
+	/*
+	 * "Left" is the current (according to the cursor) block.
+	 */
+	lbp = cur->bc_bufs[level];
+	left = XFS_BUF_TO_ALLOC_BLOCK(lbp);
+#ifdef DEBUG
+	if ((error = xfs_btree_check_sblock(cur, left, level, lbp)))
+		return error;
+#endif
+	/*
+	 * Fill in the btree header for the new block.
+	 */
+	INT_SET(right->bb_magic, ARCH_CONVERT, xfs_magics[cur->bc_btnum]);
+	right->bb_level = left->bb_level; /* INT_: direct copy */
+	INT_SET(right->bb_numrecs, ARCH_CONVERT, (__uint16_t)(INT_GET(left->bb_numrecs, ARCH_CONVERT) / 2));
+	/*
+	 * Make sure that if there's an odd number of entries now, that
+	 * each new block will have the same number of entries.
+	 */
+	if ((INT_GET(left->bb_numrecs, ARCH_CONVERT) & 1) &&
+	    cur->bc_ptrs[level] <= INT_GET(right->bb_numrecs, ARCH_CONVERT) + 1)
+		INT_MOD(right->bb_numrecs, ARCH_CONVERT, +1);
+	i = INT_GET(left->bb_numrecs, ARCH_CONVERT) - INT_GET(right->bb_numrecs, ARCH_CONVERT) + 1;
+	/*
+	 * For non-leaf blocks, copy keys and addresses over to the new block.
+	 */
+	if (level > 0) {
+		xfs_alloc_key_t	*lkp;	/* left btree key pointer */
+		xfs_alloc_ptr_t	*lpp;	/* left btree address pointer */
+		xfs_alloc_key_t	*rkp;	/* right btree key pointer */
+		xfs_alloc_ptr_t	*rpp;	/* right btree address pointer */
+
+		lkp = XFS_ALLOC_KEY_ADDR(left, i, cur);
+		lpp = XFS_ALLOC_PTR_ADDR(left, i, cur);
+		rkp = XFS_ALLOC_KEY_ADDR(right, 1, cur);
+		rpp = XFS_ALLOC_PTR_ADDR(right, 1, cur);
+#ifdef DEBUG
+		for (i = 0; i < INT_GET(right->bb_numrecs, ARCH_CONVERT); i++) {
+			if ((error = xfs_btree_check_sptr(cur, INT_GET(lpp[i], ARCH_CONVERT), level)))
+				return error;
+		}
+#endif
+		memcpy(rkp, lkp, INT_GET(right->bb_numrecs, ARCH_CONVERT) * sizeof(*rkp)); /* INT_: copy */
+		memcpy(rpp, lpp, INT_GET(right->bb_numrecs, ARCH_CONVERT) * sizeof(*rpp)); /* INT_: copy */
+		xfs_alloc_log_keys(cur, rbp, 1, INT_GET(right->bb_numrecs, ARCH_CONVERT));
+		xfs_alloc_log_ptrs(cur, rbp, 1, INT_GET(right->bb_numrecs, ARCH_CONVERT));
+		*keyp = *rkp;
+	}
+	/*
+	 * For leaf blocks, copy records over to the new block.
+	 */
+	else {
+		xfs_alloc_rec_t	*lrp;	/* left btree record pointer */
+		xfs_alloc_rec_t	*rrp;	/* right btree record pointer */
+
+		lrp = XFS_ALLOC_REC_ADDR(left, i, cur);
+		rrp = XFS_ALLOC_REC_ADDR(right, 1, cur);
+		memcpy(rrp, lrp, INT_GET(right->bb_numrecs, ARCH_CONVERT) * sizeof(*rrp));
+		xfs_alloc_log_recs(cur, rbp, 1, INT_GET(right->bb_numrecs, ARCH_CONVERT));
+		keyp->ar_startblock = rrp->ar_startblock; /* INT_: direct copy */
+		keyp->ar_blockcount = rrp->ar_blockcount; /* INT_: direct copy */
+	}
+	/*
+	 * Find the left block number by looking in the buffer.
+	 * Adjust numrecs, sibling pointers.
+	 */
+	lbno = XFS_DADDR_TO_AGBNO(cur->bc_mp, XFS_BUF_ADDR(lbp));
+	INT_MOD(left->bb_numrecs, ARCH_CONVERT, -(INT_GET(right->bb_numrecs, ARCH_CONVERT)));
+	right->bb_rightsib = left->bb_rightsib; /* INT_: direct copy */
+	INT_SET(left->bb_rightsib, ARCH_CONVERT, rbno);
+	INT_SET(right->bb_leftsib, ARCH_CONVERT, lbno);
+	xfs_alloc_log_block(cur->bc_tp, rbp, XFS_BB_ALL_BITS);
+	xfs_alloc_log_block(cur->bc_tp, lbp, XFS_BB_NUMRECS | XFS_BB_RIGHTSIB);
+	/*
+	 * If there's a block to the new block's right, make that block
+	 * point back to right instead of to left.
+	 */
+	if (INT_GET(right->bb_rightsib, ARCH_CONVERT) != NULLAGBLOCK) {
+		xfs_alloc_block_t	*rrblock;	/* rr btree block */
+		xfs_buf_t		*rrbp;		/* buffer for rrblock */
+
+		if ((error = xfs_btree_read_bufs(cur->bc_mp, cur->bc_tp,
+				cur->bc_private.a.agno, INT_GET(right->bb_rightsib, ARCH_CONVERT), 0,
+				&rrbp, XFS_ALLOC_BTREE_REF)))
+			return error;
+		rrblock = XFS_BUF_TO_ALLOC_BLOCK(rrbp);
+		if ((error = xfs_btree_check_sblock(cur, rrblock, level, rrbp)))
+			return error;
+		INT_SET(rrblock->bb_leftsib, ARCH_CONVERT, rbno);
+		xfs_alloc_log_block(cur->bc_tp, rrbp, XFS_BB_LEFTSIB);
+	}
+	/*
+	 * If the cursor is really in the right block, move it there.
+	 * If it's just pointing past the last entry in left, then we'll
+	 * insert there, so don't change anything in that case.
+	 */
+	if (cur->bc_ptrs[level] > INT_GET(left->bb_numrecs, ARCH_CONVERT) + 1) {
+		xfs_btree_setbuf(cur, level, rbp);
+		cur->bc_ptrs[level] -= INT_GET(left->bb_numrecs, ARCH_CONVERT);
+	}
+	/*
+	 * If there are more levels, we'll need another cursor which refers to
+	 * the right block, no matter where this cursor was.
+	 */
+	if (level + 1 < cur->bc_nlevels) {
+		if ((error = xfs_btree_dup_cursor(cur, curp)))
+			return error;
+		(*curp)->bc_ptrs[level + 1]++;
+	}
+	*bnop = rbno;
+	*stat = 1;
+	return 0;
+}
+
+/*
+ * Update keys at all levels from here to the root along the cursor's path.
+ */
+STATIC int				/* error */
+xfs_alloc_updkey(
+	xfs_btree_cur_t		*cur,	/* btree cursor */
+	xfs_alloc_key_t		*keyp,	/* new key value to update to */
+	int			level)	/* starting level for update */
+{
+	int			ptr;	/* index of key in block */
+
+	/*
+	 * Go up the tree from this level toward the root.
+	 * At each level, update the key value to the value input.
+	 * Stop when we reach a level where the cursor isn't pointing
+	 * at the first entry in the block.
+	 */
+	for (ptr = 1; ptr == 1 && level < cur->bc_nlevels; level++) {
+		xfs_alloc_block_t	*block;	/* btree block */
+		xfs_buf_t		*bp;	/* buffer for block */
+#ifdef DEBUG
+		int			error;	/* error return value */
+#endif
+		xfs_alloc_key_t		*kp;	/* ptr to btree block keys */
+
+		bp = cur->bc_bufs[level];
+		block = XFS_BUF_TO_ALLOC_BLOCK(bp);
+#ifdef DEBUG
+		if ((error = xfs_btree_check_sblock(cur, block, level, bp)))
+			return error;
+#endif
+		ptr = cur->bc_ptrs[level];
+		kp = XFS_ALLOC_KEY_ADDR(block, ptr, cur);
+		*kp = *keyp;
+		xfs_alloc_log_keys(cur, bp, ptr, ptr);
+	}
+	return 0;
+}
+
+/*
+ * Externally visible routines.
+ */
+
+/*
+ * Decrement cursor by one record at the level.
+ * For nonzero levels the leaf-ward information is untouched.
+ */
+int					/* error */
+xfs_alloc_decrement(
+	xfs_btree_cur_t		*cur,	/* btree cursor */
+	int			level,	/* level in btree, 0 is leaf */
+	int			*stat)	/* success/failure */
+{
+	xfs_alloc_block_t	*block;	/* btree block */
+	int			error;	/* error return value */
+	int			lev;	/* btree level */
+
+	ASSERT(level < cur->bc_nlevels);
+	/*
+	 * Read-ahead to the left at this level.
+	 */
+	xfs_btree_readahead(cur, level, XFS_BTCUR_LEFTRA);
+	/*
+	 * Decrement the ptr at this level.  If we're still in the block
+	 * then we're done.
+	 */
+	if (--cur->bc_ptrs[level] > 0) {
+		*stat = 1;
+		return 0;
+	}
+	/*
+	 * Get a pointer to the btree block.
+	 */
+	block = XFS_BUF_TO_ALLOC_BLOCK(cur->bc_bufs[level]);
+#ifdef DEBUG
+	if ((error = xfs_btree_check_sblock(cur, block, level,
+			cur->bc_bufs[level])))
+		return error;
+#endif
+	/*
+	 * If we just went off the left edge of the tree, return failure.
+	 */
+	if (INT_GET(block->bb_leftsib, ARCH_CONVERT) == NULLAGBLOCK) {
+		*stat = 0;
+		return 0;
+	}
+	/*
+	 * March up the tree decrementing pointers.
+	 * Stop when we don't go off the left edge of a block.
+	 */
+	for (lev = level + 1; lev < cur->bc_nlevels; lev++) {
+		if (--cur->bc_ptrs[lev] > 0)
+			break;
+		/*
+		 * Read-ahead the left block, we're going to read it
+		 * in the next loop.
+		 */
+		xfs_btree_readahead(cur, lev, XFS_BTCUR_LEFTRA);
+	}
+	/*
+	 * If we went off the root then we are seriously confused.
+	 */
+	ASSERT(lev < cur->bc_nlevels);
+	/*
+	 * Now walk back down the tree, fixing up the cursor's buffer
+	 * pointers and key numbers.
+	 */
+	for (block = XFS_BUF_TO_ALLOC_BLOCK(cur->bc_bufs[lev]); lev > level; ) {
+		xfs_agblock_t	agbno;	/* block number of btree block */
+		xfs_buf_t	*bp;	/* buffer pointer for block */
+
+		agbno = INT_GET(*XFS_ALLOC_PTR_ADDR(block, cur->bc_ptrs[lev], cur), ARCH_CONVERT);
+		if ((error = xfs_btree_read_bufs(cur->bc_mp, cur->bc_tp,
+				cur->bc_private.a.agno, agbno, 0, &bp,
+				XFS_ALLOC_BTREE_REF)))
+			return error;
+		lev--;
+		xfs_btree_setbuf(cur, lev, bp);
+		block = XFS_BUF_TO_ALLOC_BLOCK(bp);
+		if ((error = xfs_btree_check_sblock(cur, block, lev, bp)))
+			return error;
+		cur->bc_ptrs[lev] = INT_GET(block->bb_numrecs, ARCH_CONVERT);
+	}
+	*stat = 1;
+	return 0;
+}
+
+/*
+ * 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_alloc_delete(
+	xfs_btree_cur_t	*cur,		/* btree cursor */
+	int		*stat)		/* success/failure */
+{
+	int		error;		/* error return value */
+	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_alloc_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_alloc_decrement(cur, level, &i)))
+					return error;
+				break;
+			}
+		}
+	}
+	*stat = i;
+	return 0;
+}
+
+/*
+ * Get the data from the pointed-to record.
+ */
+int					/* error */
+xfs_alloc_get_rec(
+	xfs_btree_cur_t		*cur,	/* btree cursor */
+	xfs_agblock_t		*bno,	/* output: starting block of extent */
+	xfs_extlen_t		*len,	/* output: length of extent */
+	int			*stat)	/* output: success/failure */
+{
+	xfs_alloc_block_t	*block;	/* btree block */
+#ifdef DEBUG
+	int			error;	/* error return value */
+#endif
+	int			ptr;	/* record number */
+
+	ptr = cur->bc_ptrs[0];
+	block = XFS_BUF_TO_ALLOC_BLOCK(cur->bc_bufs[0]);
+#ifdef DEBUG
+	if ((error = xfs_btree_check_sblock(cur, block, 0, cur->bc_bufs[0])))
+		return error;
+#endif
+	/*
+	 * Off the right end or left end, return failure.
+	 */
+	if (ptr > INT_GET(block->bb_numrecs, ARCH_CONVERT) || ptr <= 0) {
+		*stat = 0;
+		return 0;
+	}
+	/*
+	 * Point to the record and extract its data.
+	 */
+	{
+		xfs_alloc_rec_t		*rec;	/* record data */
+
+		rec = XFS_ALLOC_REC_ADDR(block, ptr, cur);
+		*bno = INT_GET(rec->ar_startblock, ARCH_CONVERT);
+		*len = INT_GET(rec->ar_blockcount, ARCH_CONVERT);
+	}
+	*stat = 1;
+	return 0;
+}
+
+/*
+ * Increment cursor by one record at the level.
+ * For nonzero levels the leaf-ward information is untouched.
+ */
+int					/* error */
+xfs_alloc_increment(
+	xfs_btree_cur_t		*cur,	/* btree cursor */
+	int			level,	/* level in btree, 0 is leaf */
+	int			*stat)	/* success/failure */
+{
+	xfs_alloc_block_t	*block;	/* btree block */
+	xfs_buf_t		*bp;	/* tree block buffer */
+	int			error;	/* error return value */
+	int			lev;	/* btree level */
+
+	ASSERT(level < cur->bc_nlevels);
+	/*
+	 * Read-ahead to the right at this level.
+	 */
+	xfs_btree_readahead(cur, level, XFS_BTCUR_RIGHTRA);
+	/*
+	 * Get a pointer to the btree block.
+	 */
+	bp = cur->bc_bufs[level];
+	block = XFS_BUF_TO_ALLOC_BLOCK(bp);
+#ifdef DEBUG
+	if ((error = xfs_btree_check_sblock(cur, block, level, bp)))
+		return error;
+#endif
+	/*
+	 * Increment the ptr at this level.  If we're still in the block
+	 * then we're done.
+	 */
+	if (++cur->bc_ptrs[level] <= INT_GET(block->bb_numrecs, ARCH_CONVERT)) {
+		*stat = 1;
+		return 0;
+	}
+	/*
+	 * If we just went off the right edge of the tree, return failure.
+	 */
+	if (INT_GET(block->bb_rightsib, ARCH_CONVERT) == NULLAGBLOCK) {
+		*stat = 0;
+		return 0;
+	}
+	/*
+	 * March up the tree incrementing pointers.
+	 * Stop when we don't go off the right edge of a block.
+	 */
+	for (lev = level + 1; lev < cur->bc_nlevels; lev++) {
+		bp = cur->bc_bufs[lev];
+		block = XFS_BUF_TO_ALLOC_BLOCK(bp);
+#ifdef DEBUG
+		if ((error = xfs_btree_check_sblock(cur, block, lev, bp)))
+			return error;
+#endif
+		if (++cur->bc_ptrs[lev] <= INT_GET(block->bb_numrecs, ARCH_CONVERT))
+			break;
+		/*
+		 * Read-ahead the right block, we're going to read it
+		 * in the next loop.
+		 */
+		xfs_btree_readahead(cur, lev, XFS_BTCUR_RIGHTRA);
+	}
+	/*
+	 * If we went off the root then we are seriously confused.
+	 */
+	ASSERT(lev < cur->bc_nlevels);
+	/*
+	 * Now walk back down the tree, fixing up the cursor's buffer
+	 * pointers and key numbers.
+	 */
+	for (bp = cur->bc_bufs[lev], block = XFS_BUF_TO_ALLOC_BLOCK(bp);
+	     lev > level; ) {
+		xfs_agblock_t	agbno;	/* block number of btree block */
+
+		agbno = INT_GET(*XFS_ALLOC_PTR_ADDR(block, cur->bc_ptrs[lev], cur), ARCH_CONVERT);
+		if ((error = xfs_btree_read_bufs(cur->bc_mp, cur->bc_tp,
+				cur->bc_private.a.agno, agbno, 0, &bp,
+				XFS_ALLOC_BTREE_REF)))
+			return error;
+		lev--;
+		xfs_btree_setbuf(cur, lev, bp);
+		block = XFS_BUF_TO_ALLOC_BLOCK(bp);
+		if ((error = xfs_btree_check_sblock(cur, block, lev, bp)))
+			return error;
+		cur->bc_ptrs[lev] = 1;
+	}
+	*stat = 1;
+	return 0;
+}
+
+/*
+ * Insert the current record at the point referenced by cur.
+ * The cursor may be inconsistent on return if splits have been done.
+ */
+int					/* error */
+xfs_alloc_insert(
+	xfs_btree_cur_t	*cur,		/* btree cursor */
+	int		*stat)		/* success/failure */
+{
+	int		error;		/* error return value */
+	int		i;		/* result value, 0 for failure */
+	int		level;		/* current level number in btree */
+	xfs_agblock_t	nbno;		/* new block number (split result) */
+	xfs_btree_cur_t	*ncur;		/* new cursor (split result) */
+	xfs_alloc_rec_t	nrec;		/* record being inserted this level */
+	xfs_btree_cur_t	*pcur;		/* previous level's cursor */
+
+	level = 0;
+	nbno = NULLAGBLOCK;
+	INT_SET(nrec.ar_startblock, ARCH_CONVERT, cur->bc_rec.a.ar_startblock);
+	INT_SET(nrec.ar_blockcount, ARCH_CONVERT, cur->bc_rec.a.ar_blockcount);
+	ncur = (xfs_btree_cur_t *)0;
+	pcur = cur;
+	/*
+	 * Loop going up the tree, starting at the leaf level.
+	 * Stop when we don't get a split block, that must mean that
+	 * the insert is finished with this level.
+	 */
+	do {
+		/*
+		 * Insert nrec/nbno into this level of the tree.
+		 * Note if we fail, nbno will be null.
+		 */
+		if ((error = xfs_alloc_insrec(pcur, level++, &nbno, &nrec, &ncur,
+				&i))) {
+			if (pcur != cur)
+				xfs_btree_del_cursor(pcur, XFS_BTREE_ERROR);
+			return error;
+		}
+		/*
+		 * See if the cursor we just used is trash.
+		 * Can't trash the caller's cursor, but otherwise we should
+		 * if ncur is a new cursor or we're about to be done.
+		 */
+		if (pcur != cur && (ncur || nbno == NULLAGBLOCK)) {
+			cur->bc_nlevels = pcur->bc_nlevels;
+			xfs_btree_del_cursor(pcur, XFS_BTREE_NOERROR);
+		}
+		/*
+		 * If we got a new cursor, switch to it.
+		 */
+		if (ncur) {
+			pcur = ncur;
+			ncur = (xfs_btree_cur_t *)0;
+		}
+	} while (nbno != NULLAGBLOCK);
+	*stat = i;
+	return 0;
+}
+
+/*
+ * Lookup the record equal to [bno, len] in the btree given by cur.
+ */
+int					/* error */
+xfs_alloc_lookup_eq(
+	xfs_btree_cur_t	*cur,		/* btree cursor */
+	xfs_agblock_t	bno,		/* starting block of extent */
+	xfs_extlen_t	len,		/* length of extent */
+	int		*stat)		/* success/failure */
+{
+	cur->bc_rec.a.ar_startblock = bno;
+	cur->bc_rec.a.ar_blockcount = len;
+	return xfs_alloc_lookup(cur, XFS_LOOKUP_EQ, stat);
+}
+
+/*
+ * Lookup the first record greater than or equal to [bno, len]
+ * in the btree given by cur.
+ */
+int					/* error */
+xfs_alloc_lookup_ge(
+	xfs_btree_cur_t	*cur,		/* btree cursor */
+	xfs_agblock_t	bno,		/* starting block of extent */
+	xfs_extlen_t	len,		/* length of extent */
+	int		*stat)		/* success/failure */
+{
+	cur->bc_rec.a.ar_startblock = bno;
+	cur->bc_rec.a.ar_blockcount = len;
+	return xfs_alloc_lookup(cur, XFS_LOOKUP_GE, stat);
+}
+
+/*
+ * Lookup the first record less than or equal to [bno, len]
+ * in the btree given by cur.
+ */
+int					/* error */
+xfs_alloc_lookup_le(
+	xfs_btree_cur_t	*cur,		/* btree cursor */
+	xfs_agblock_t	bno,		/* starting block of extent */
+	xfs_extlen_t	len,		/* length of extent */
+	int		*stat)		/* success/failure */
+{
+	cur->bc_rec.a.ar_startblock = bno;
+	cur->bc_rec.a.ar_blockcount = len;
+	return xfs_alloc_lookup(cur, XFS_LOOKUP_LE, stat);
+}
+
+/*
+ * Update the record referred to by cur, to the value given by [bno, len].
+ * This either works (return 0) or gets an EFSCORRUPTED error.
+ */
+int					/* error */
+xfs_alloc_update(
+	xfs_btree_cur_t		*cur,	/* btree cursor */
+	xfs_agblock_t		bno,	/* starting block of extent */
+	xfs_extlen_t		len)	/* length of extent */
+{
+	xfs_alloc_block_t	*block;	/* btree block to update */
+	int			error;	/* error return value */
+	int			ptr;	/* current record number (updating) */
+
+	ASSERT(len > 0);
+	/*
+	 * Pick up the a.g. freelist struct and the current block.
+	 */
+	block = XFS_BUF_TO_ALLOC_BLOCK(cur->bc_bufs[0]);
+#ifdef DEBUG
+	if ((error = xfs_btree_check_sblock(cur, block, 0, cur->bc_bufs[0])))
+		return error;
+#endif
+	/*
+	 * Get the address of the rec to be updated.
+	 */
+	ptr = cur->bc_ptrs[0];
+	{
+		xfs_alloc_rec_t		*rp;	/* pointer to updated record */
+
+		rp = XFS_ALLOC_REC_ADDR(block, ptr, cur);
+		/*
+		 * Fill in the new contents and log them.
+		 */
+		INT_SET(rp->ar_startblock, ARCH_CONVERT, bno);
+		INT_SET(rp->ar_blockcount, ARCH_CONVERT, len);
+		xfs_alloc_log_recs(cur, cur->bc_bufs[0], ptr, ptr);
+	}
+	/*
+	 * If it's the by-size btree and it's the last leaf block and
+	 * it's the last record... then update the size of the longest
+	 * extent in the a.g., which we cache in the a.g. freelist header.
+	 */
+	if (cur->bc_btnum == XFS_BTNUM_CNT &&
+	    INT_GET(block->bb_rightsib, ARCH_CONVERT) == NULLAGBLOCK &&
+	    ptr == INT_GET(block->bb_numrecs, ARCH_CONVERT)) {
+		xfs_agf_t	*agf;	/* a.g. freespace header */
+		xfs_agnumber_t	seqno;
+
+		agf = XFS_BUF_TO_AGF(cur->bc_private.a.agbp);
+		seqno = INT_GET(agf->agf_seqno, ARCH_CONVERT);
+		cur->bc_mp->m_perag[seqno].pagf_longest = len;
+		INT_SET(agf->agf_longest, ARCH_CONVERT, len);
+		xfs_alloc_log_agf(cur->bc_tp, cur->bc_private.a.agbp,
+			XFS_AGF_LONGEST);
+	}
+	/*
+	 * Updating first record in leaf. Pass new key value up to our parent.
+	 */
+	if (ptr == 1) {
+		xfs_alloc_key_t	key;	/* key containing [bno, len] */
+
+		INT_SET(key.ar_startblock, ARCH_CONVERT, bno);
+		INT_SET(key.ar_blockcount, ARCH_CONVERT, len);
+		if ((error = xfs_alloc_updkey(cur, &key, 1)))
+			return error;
+	}
+	return 0;
+}