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, 6246 insertions, 0 deletions

diff --git a/fs/xfs/xfs_bmap.c b/fs/xfs/xfs_bmap.c
new file mode 100644
index 000000000000..de3162418663
--- /dev/null
+++ b/fs/xfs/xfs_bmap.c
@@ -0,0 +1,6246 @@
+/*
+ * Copyright (c) 2000-2004 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/
+ */
+
+#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_dir2.h"
+#include "xfs_dmapi.h"
+#include "xfs_mount.h"
+#include "xfs_alloc_btree.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_ialloc_btree.h"
+#include "xfs_btree.h"
+#include "xfs_ialloc.h"
+#include "xfs_attr_sf.h"
+#include "xfs_dir_sf.h"
+#include "xfs_dir2_sf.h"
+#include "xfs_dinode.h"
+#include "xfs_inode_item.h"
+#include "xfs_inode.h"
+#include "xfs_itable.h"
+#include "xfs_extfree_item.h"
+#include "xfs_alloc.h"
+#include "xfs_bmap.h"
+#include "xfs_rtalloc.h"
+#include "xfs_error.h"
+#include "xfs_da_btree.h"
+#include "xfs_dir_leaf.h"
+#include "xfs_bit.h"
+#include "xfs_rw.h"
+#include "xfs_quota.h"
+#include "xfs_trans_space.h"
+#include "xfs_buf_item.h"
+
+
+#ifdef DEBUG
+STATIC void
+xfs_bmap_check_leaf_extents(xfs_btree_cur_t *cur, xfs_inode_t *ip, int whichfork);
+#endif
+
+kmem_zone_t		*xfs_bmap_free_item_zone;
+
+/*
+ * Prototypes for internal bmap routines.
+ */
+
+
+/*
+ * Called from xfs_bmap_add_attrfork to handle extents format files.
+ */
+STATIC int					/* error */
+xfs_bmap_add_attrfork_extents(
+	xfs_trans_t		*tp,		/* transaction pointer */
+	xfs_inode_t		*ip,		/* incore inode pointer */
+	xfs_fsblock_t		*firstblock,	/* first block allocated */
+	xfs_bmap_free_t		*flist,		/* blocks to free at commit */
+	int			*flags);	/* inode logging flags */
+
+/*
+ * Called from xfs_bmap_add_attrfork to handle local format files.
+ */
+STATIC int					/* error */
+xfs_bmap_add_attrfork_local(
+	xfs_trans_t		*tp,		/* transaction pointer */
+	xfs_inode_t		*ip,		/* incore inode pointer */
+	xfs_fsblock_t		*firstblock,	/* first block allocated */
+	xfs_bmap_free_t		*flist,		/* blocks to free at commit */
+	int			*flags);	/* inode logging flags */
+
+/*
+ * Called by xfs_bmapi to update extent list structure and the btree
+ * after allocating space (or doing a delayed allocation).
+ */
+STATIC int				/* error */
+xfs_bmap_add_extent(
+	xfs_inode_t		*ip,	/* incore inode pointer */
+	xfs_extnum_t		idx,	/* extent number to update/insert */
+	xfs_btree_cur_t		**curp,	/* if *curp is null, not a btree */
+	xfs_bmbt_irec_t		*new,	/* new data to put in extent list */
+	xfs_fsblock_t		*first,	/* pointer to firstblock variable */
+	xfs_bmap_free_t		*flist,	/* list of extents to be freed */
+	int			*logflagsp, /* inode logging flags */
+	int			whichfork, /* data or attr fork */
+	int			rsvd);	/* OK to allocate reserved blocks */
+
+/*
+ * Called by xfs_bmap_add_extent to handle cases converting a delayed
+ * allocation to a real allocation.
+ */
+STATIC int				/* error */
+xfs_bmap_add_extent_delay_real(
+	xfs_inode_t		*ip,	/* incore inode pointer */
+	xfs_extnum_t		idx,	/* extent number to update/insert */
+	xfs_btree_cur_t		**curp,	/* if *curp is null, not a btree */
+	xfs_bmbt_irec_t		*new,	/* new data to put in extent list */
+	xfs_filblks_t		*dnew,	/* new delayed-alloc indirect blocks */
+	xfs_fsblock_t		*first,	/* pointer to firstblock variable */
+	xfs_bmap_free_t		*flist,	/* list of extents to be freed */
+	int			*logflagsp, /* inode logging flags */
+	int			rsvd);	/* OK to allocate reserved blocks */
+
+/*
+ * Called by xfs_bmap_add_extent to handle cases converting a hole
+ * to a delayed allocation.
+ */
+STATIC int				/* error */
+xfs_bmap_add_extent_hole_delay(
+	xfs_inode_t		*ip,	/* incore inode pointer */
+	xfs_extnum_t		idx,	/* extent number to update/insert */
+	xfs_btree_cur_t		*cur,	/* if null, not a btree */
+	xfs_bmbt_irec_t		*new,	/* new data to put in extent list */
+	int			*logflagsp,/* inode logging flags */
+	int			rsvd);	/* OK to allocate reserved blocks */
+
+/*
+ * Called by xfs_bmap_add_extent to handle cases converting a hole
+ * to a real allocation.
+ */
+STATIC int				/* error */
+xfs_bmap_add_extent_hole_real(
+	xfs_inode_t		*ip,	/* incore inode pointer */
+	xfs_extnum_t		idx,	/* extent number to update/insert */
+	xfs_btree_cur_t		*cur,	/* if null, not a btree */
+	xfs_bmbt_irec_t		*new,	/* new data to put in extent list */
+	int			*logflagsp, /* inode logging flags */
+	int			whichfork); /* data or attr fork */
+
+/*
+ * Called by xfs_bmap_add_extent to handle cases converting an unwritten
+ * allocation to a real allocation or vice versa.
+ */
+STATIC int				/* error */
+xfs_bmap_add_extent_unwritten_real(
+	xfs_inode_t		*ip,	/* incore inode pointer */
+	xfs_extnum_t		idx,	/* extent number to update/insert */
+	xfs_btree_cur_t		**curp,	/* if *curp is null, not a btree */
+	xfs_bmbt_irec_t		*new,	/* new data to put in extent list */
+	int			*logflagsp); /* inode logging flags */
+
+/*
+ * xfs_bmap_alloc is called by xfs_bmapi to allocate an extent for a file.
+ * It figures out where to ask the underlying allocator to put the new extent.
+ */
+STATIC int				/* error */
+xfs_bmap_alloc(
+	xfs_bmalloca_t		*ap);	/* bmap alloc argument struct */
+
+/*
+ * Transform a btree format file with only one leaf node, where the
+ * extents list will fit in the inode, into an extents format file.
+ * Since the extent list is already in-core, all we have to do is
+ * give up the space for the btree root and pitch the leaf block.
+ */
+STATIC int				/* error */
+xfs_bmap_btree_to_extents(
+	xfs_trans_t		*tp,	/* transaction pointer */
+	xfs_inode_t		*ip,	/* incore inode pointer */
+	xfs_btree_cur_t		*cur,	/* btree cursor */
+	int			*logflagsp, /* inode logging flags */
+	int			whichfork); /* data or attr fork */
+
+#ifdef DEBUG
+/*
+ * Check that the extents list for the inode ip is in the right order.
+ */
+STATIC void
+xfs_bmap_check_extents(
+	xfs_inode_t		*ip,		/* incore inode pointer */
+	int			whichfork);	/* data or attr fork */
+#endif
+
+/*
+ * Called by xfs_bmapi to update extent list structure and the btree
+ * after removing space (or undoing a delayed allocation).
+ */
+STATIC int				/* error */
+xfs_bmap_del_extent(
+	xfs_inode_t		*ip,	/* incore inode pointer */
+	xfs_trans_t		*tp,	/* current trans pointer */
+	xfs_extnum_t		idx,	/* extent number to update/insert */
+	xfs_bmap_free_t		*flist,	/* list of extents to be freed */
+	xfs_btree_cur_t		*cur,	/* if null, not a btree */
+	xfs_bmbt_irec_t		*new,	/* new data to put in extent list */
+	int			*logflagsp,/* inode logging flags */
+	int			whichfork, /* data or attr fork */
+	int			rsvd);	 /* OK to allocate reserved blocks */
+
+/*
+ * Remove the entry "free" from the free item list.  Prev points to the
+ * previous entry, unless "free" is the head of the list.
+ */
+STATIC void
+xfs_bmap_del_free(
+	xfs_bmap_free_t		*flist,	/* free item list header */
+	xfs_bmap_free_item_t	*prev,	/* previous item on list, if any */
+	xfs_bmap_free_item_t	*free);	/* list item to be freed */
+
+/*
+ * Remove count entries from the extents array for inode "ip", starting
+ * at index "idx".  Copies the remaining items down over the deleted ones,
+ * and gives back the excess memory.
+ */
+STATIC void
+xfs_bmap_delete_exlist(
+	xfs_inode_t	*ip,		/* incode inode pointer */
+	xfs_extnum_t	idx,		/* starting delete index */
+	xfs_extnum_t	count,		/* count of items to delete */
+	int		whichfork);	/* data or attr fork */
+
+/*
+ * Convert an extents-format file into a btree-format file.
+ * The new file will have a root block (in the inode) and a single child block.
+ */
+STATIC int					/* error */
+xfs_bmap_extents_to_btree(
+	xfs_trans_t		*tp,		/* transaction pointer */
+	xfs_inode_t		*ip,		/* incore inode pointer */
+	xfs_fsblock_t		*firstblock,	/* first-block-allocated */
+	xfs_bmap_free_t		*flist,		/* blocks freed in xaction */
+	xfs_btree_cur_t		**curp,		/* cursor returned to caller */
+	int			wasdel,		/* converting a delayed alloc */
+	int			*logflagsp,	/* inode logging flags */
+	int			whichfork);	/* data or attr fork */
+
+/*
+ * Insert new item(s) in the extent list for inode "ip".
+ * Count new items are inserted at offset idx.
+ */
+STATIC void
+xfs_bmap_insert_exlist(
+	xfs_inode_t	*ip,		/* incore inode pointer */
+	xfs_extnum_t	idx,		/* starting index of new items */
+	xfs_extnum_t	count,		/* number of inserted items */
+	xfs_bmbt_irec_t	*new,		/* items to insert */
+	int		whichfork);	/* data or attr fork */
+
+/*
+ * Convert a local file to an extents file.
+ * This code is sort of bogus, since the file data needs to get
+ * logged so it won't be lost.  The bmap-level manipulations are ok, though.
+ */
+STATIC int				/* error */
+xfs_bmap_local_to_extents(
+	xfs_trans_t	*tp,		/* transaction pointer */
+	xfs_inode_t	*ip,		/* incore inode pointer */
+	xfs_fsblock_t	*firstblock,	/* first block allocated in xaction */
+	xfs_extlen_t	total,		/* total blocks needed by transaction */
+	int		*logflagsp,	/* inode logging flags */
+	int		whichfork);	/* data or attr fork */
+
+/*
+ * Search the extents list for the inode, for the extent containing bno.
+ * If bno lies in a hole, point to the next entry.  If bno lies past eof,
+ * *eofp will be set, and *prevp will contain the last entry (null if none).
+ * Else, *lastxp will be set to the index of the found
+ * entry; *gotp will contain the entry.
+ */
+STATIC xfs_bmbt_rec_t *			/* pointer to found extent entry */
+xfs_bmap_search_extents(
+	xfs_inode_t	*ip,		/* incore inode pointer */
+	xfs_fileoff_t	bno,		/* block number searched for */
+	int		whichfork,	/* data or attr fork */
+	int		*eofp,		/* out: end of file found */
+	xfs_extnum_t	*lastxp,	/* out: last extent index */
+	xfs_bmbt_irec_t	*gotp,		/* out: extent entry found */
+	xfs_bmbt_irec_t	*prevp);	/* out: previous extent entry found */
+
+#ifdef XFS_BMAP_TRACE
+/*
+ * Add a bmap trace buffer entry.  Base routine for the others.
+ */
+STATIC void
+xfs_bmap_trace_addentry(
+	int		opcode,		/* operation */
+	char		*fname,		/* function name */
+	char		*desc,		/* operation description */
+	xfs_inode_t	*ip,		/* incore inode pointer */
+	xfs_extnum_t	idx,		/* index of entry(ies) */
+	xfs_extnum_t	cnt,		/* count of entries, 1 or 2 */
+	xfs_bmbt_rec_t	*r1,		/* first record */
+	xfs_bmbt_rec_t	*r2,		/* second record or null */
+	int		whichfork);	/* data or attr fork */
+
+/*
+ * Add bmap trace entry prior to a call to xfs_bmap_delete_exlist.
+ */
+STATIC void
+xfs_bmap_trace_delete(
+	char		*fname,		/* function name */
+	char		*desc,		/* operation description */
+	xfs_inode_t	*ip,		/* incore inode pointer */
+	xfs_extnum_t	idx,		/* index of entry(entries) deleted */
+	xfs_extnum_t	cnt,		/* count of entries deleted, 1 or 2 */
+	int		whichfork);	/* data or attr fork */
+
+/*
+ * Add bmap trace entry prior to a call to xfs_bmap_insert_exlist, or
+ * reading in the extents list from the disk (in the btree).
+ */
+STATIC void
+xfs_bmap_trace_insert(
+	char		*fname,		/* function name */
+	char		*desc,		/* operation description */
+	xfs_inode_t	*ip,		/* incore inode pointer */
+	xfs_extnum_t	idx,		/* index of entry(entries) inserted */
+	xfs_extnum_t	cnt,		/* count of entries inserted, 1 or 2 */
+	xfs_bmbt_irec_t	*r1,		/* inserted record 1 */
+	xfs_bmbt_irec_t	*r2,		/* inserted record 2 or null */
+	int		whichfork);	/* data or attr fork */
+
+/*
+ * Add bmap trace entry after updating an extent list entry in place.
+ */
+STATIC void
+xfs_bmap_trace_post_update(
+	char		*fname,		/* function name */
+	char		*desc,		/* operation description */
+	xfs_inode_t	*ip,		/* incore inode pointer */
+	xfs_extnum_t	idx,		/* index of entry updated */
+	int		whichfork);	/* data or attr fork */
+
+/*
+ * Add bmap trace entry prior to updating an extent list entry in place.
+ */
+STATIC void
+xfs_bmap_trace_pre_update(
+	char		*fname,		/* function name */
+	char		*desc,		/* operation description */
+	xfs_inode_t	*ip,		/* incore inode pointer */
+	xfs_extnum_t	idx,		/* index of entry to be updated */
+	int		whichfork);	/* data or attr fork */
+
+#else
+#define	xfs_bmap_trace_delete(f,d,ip,i,c,w)
+#define	xfs_bmap_trace_insert(f,d,ip,i,c,r1,r2,w)
+#define	xfs_bmap_trace_post_update(f,d,ip,i,w)
+#define	xfs_bmap_trace_pre_update(f,d,ip,i,w)
+#endif	/* XFS_BMAP_TRACE */
+
+/*
+ * Compute the worst-case number of indirect blocks that will be used
+ * for ip's delayed extent of length "len".
+ */
+STATIC xfs_filblks_t
+xfs_bmap_worst_indlen(
+	xfs_inode_t		*ip,	/* incore inode pointer */
+	xfs_filblks_t		len);	/* delayed extent length */
+
+#ifdef DEBUG
+/*
+ * Perform various validation checks on the values being returned
+ * from xfs_bmapi().
+ */
+STATIC void
+xfs_bmap_validate_ret(
+	xfs_fileoff_t		bno,
+	xfs_filblks_t		len,
+	int			flags,
+	xfs_bmbt_irec_t		*mval,
+	int			nmap,
+	int			ret_nmap);
+#else
+#define	xfs_bmap_validate_ret(bno,len,flags,mval,onmap,nmap)
+#endif /* DEBUG */
+
+#if defined(XFS_RW_TRACE)
+STATIC void
+xfs_bunmap_trace(
+	xfs_inode_t		*ip,
+	xfs_fileoff_t		bno,
+	xfs_filblks_t		len,
+	int			flags,
+	inst_t			*ra);
+#else
+#define	xfs_bunmap_trace(ip, bno, len, flags, ra)
+#endif	/* XFS_RW_TRACE */
+
+STATIC int
+xfs_bmap_count_tree(
+	xfs_mount_t     *mp,
+	xfs_trans_t     *tp,
+	xfs_fsblock_t   blockno,
+	int             levelin,
+	int		*count);
+
+STATIC int
+xfs_bmap_count_leaves(
+	xfs_bmbt_rec_t		*frp,
+	int			numrecs,
+	int			*count);
+
+/*
+ * Bmap internal routines.
+ */
+
+/*
+ * Called from xfs_bmap_add_attrfork to handle btree format files.
+ */
+STATIC int					/* error */
+xfs_bmap_add_attrfork_btree(
+	xfs_trans_t		*tp,		/* transaction pointer */
+	xfs_inode_t		*ip,		/* incore inode pointer */
+	xfs_fsblock_t		*firstblock,	/* first block allocated */
+	xfs_bmap_free_t		*flist,		/* blocks to free at commit */
+	int			*flags)		/* inode logging flags */
+{
+	xfs_btree_cur_t		*cur;		/* btree cursor */
+	int			error;		/* error return value */
+	xfs_mount_t		*mp;		/* file system mount struct */
+	int			stat;		/* newroot status */
+
+	mp = ip->i_mount;
+	if (ip->i_df.if_broot_bytes <= XFS_IFORK_DSIZE(ip))
+		*flags |= XFS_ILOG_DBROOT;
+	else {
+		cur = xfs_btree_init_cursor(mp, tp, NULL, 0, XFS_BTNUM_BMAP, ip,
+			XFS_DATA_FORK);
+		cur->bc_private.b.flist = flist;
+		cur->bc_private.b.firstblock = *firstblock;
+		if ((error = xfs_bmbt_lookup_ge(cur, 0, 0, 0, &stat)))
+			goto error0;
+		ASSERT(stat == 1);	/* must be at least one entry */
+		if ((error = xfs_bmbt_newroot(cur, flags, &stat)))
+			goto error0;
+		if (stat == 0) {
+			xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
+			return XFS_ERROR(ENOSPC);
+		}
+		*firstblock = cur->bc_private.b.firstblock;
+		cur->bc_private.b.allocated = 0;
+		xfs_btree_del_cursor(cur, XFS_BTREE_NOERROR);
+	}
+	return 0;
+error0:
+	xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
+	return error;
+}
+
+/*
+ * Called from xfs_bmap_add_attrfork to handle extents format files.
+ */
+STATIC int					/* error */
+xfs_bmap_add_attrfork_extents(
+	xfs_trans_t		*tp,		/* transaction pointer */
+	xfs_inode_t		*ip,		/* incore inode pointer */
+	xfs_fsblock_t		*firstblock,	/* first block allocated */
+	xfs_bmap_free_t		*flist,		/* blocks to free at commit */
+	int			*flags)		/* inode logging flags */
+{
+	xfs_btree_cur_t		*cur;		/* bmap btree cursor */
+	int			error;		/* error return value */
+
+	if (ip->i_d.di_nextents * sizeof(xfs_bmbt_rec_t) <= XFS_IFORK_DSIZE(ip))
+		return 0;
+	cur = NULL;
+	error = xfs_bmap_extents_to_btree(tp, ip, firstblock, flist, &cur, 0,
+		flags, XFS_DATA_FORK);
+	if (cur) {
+		cur->bc_private.b.allocated = 0;
+		xfs_btree_del_cursor(cur,
+			error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
+	}
+	return error;
+}
+
+/*
+ * Called from xfs_bmap_add_attrfork to handle local format files.
+ */
+STATIC int					/* error */
+xfs_bmap_add_attrfork_local(
+	xfs_trans_t		*tp,		/* transaction pointer */
+	xfs_inode_t		*ip,		/* incore inode pointer */
+	xfs_fsblock_t		*firstblock,	/* first block allocated */
+	xfs_bmap_free_t		*flist,		/* blocks to free at commit */
+	int			*flags)		/* inode logging flags */
+{
+	xfs_da_args_t		dargs;		/* args for dir/attr code */
+	int			error;		/* error return value */
+	xfs_mount_t		*mp;		/* mount structure pointer */
+
+	if (ip->i_df.if_bytes <= XFS_IFORK_DSIZE(ip))
+		return 0;
+	if ((ip->i_d.di_mode & S_IFMT) == S_IFDIR) {
+		mp = ip->i_mount;
+		memset(&dargs, 0, sizeof(dargs));
+		dargs.dp = ip;
+		dargs.firstblock = firstblock;
+		dargs.flist = flist;
+		dargs.total = mp->m_dirblkfsbs;
+		dargs.whichfork = XFS_DATA_FORK;
+		dargs.trans = tp;
+		error = XFS_DIR_SHORTFORM_TO_SINGLE(mp, &dargs);
+	} else
+		error = xfs_bmap_local_to_extents(tp, ip, firstblock, 1, flags,
+			XFS_DATA_FORK);
+	return error;
+}
+
+/*
+ * Called by xfs_bmapi to update extent list structure and the btree
+ * after allocating space (or doing a delayed allocation).
+ */
+STATIC int				/* error */
+xfs_bmap_add_extent(
+	xfs_inode_t		*ip,	/* incore inode pointer */
+	xfs_extnum_t		idx,	/* extent number to update/insert */
+	xfs_btree_cur_t		**curp,	/* if *curp is null, not a btree */
+	xfs_bmbt_irec_t		*new,	/* new data to put in extent list */
+	xfs_fsblock_t		*first,	/* pointer to firstblock variable */
+	xfs_bmap_free_t		*flist,	/* list of extents to be freed */
+	int			*logflagsp, /* inode logging flags */
+	int			whichfork, /* data or attr fork */
+	int			rsvd)	/* OK to use reserved data blocks */
+{
+	xfs_btree_cur_t		*cur;	/* btree cursor or null */
+	xfs_filblks_t		da_new; /* new count del alloc blocks used */
+	xfs_filblks_t		da_old; /* old count del alloc blocks used */
+	int			error;	/* error return value */
+#ifdef XFS_BMAP_TRACE
+	static char		fname[] = "xfs_bmap_add_extent";
+#endif
+	xfs_ifork_t		*ifp;	/* inode fork ptr */
+	int			logflags; /* returned value */
+	xfs_extnum_t		nextents; /* number of extents in file now */
+
+	XFS_STATS_INC(xs_add_exlist);
+	cur = *curp;
+	ifp = XFS_IFORK_PTR(ip, whichfork);
+	nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
+	ASSERT(idx <= nextents);
+	da_old = da_new = 0;
+	error = 0;
+	/*
+	 * This is the first extent added to a new/empty file.
+	 * Special case this one, so other routines get to assume there are
+	 * already extents in the list.
+	 */
+	if (nextents == 0) {
+		xfs_bmap_trace_insert(fname, "insert empty", ip, 0, 1, new,
+			NULL, whichfork);
+		xfs_bmap_insert_exlist(ip, 0, 1, new, whichfork);
+		ASSERT(cur == NULL);
+		ifp->if_lastex = 0;
+		if (!ISNULLSTARTBLOCK(new->br_startblock)) {
+			XFS_IFORK_NEXT_SET(ip, whichfork, 1);
+			logflags = XFS_ILOG_CORE | XFS_ILOG_FEXT(whichfork);
+		} else
+			logflags = 0;
+	}
+	/*
+	 * Any kind of new delayed allocation goes here.
+	 */
+	else if (ISNULLSTARTBLOCK(new->br_startblock)) {
+		if (cur)
+			ASSERT((cur->bc_private.b.flags &
+				XFS_BTCUR_BPRV_WASDEL) == 0);
+		if ((error = xfs_bmap_add_extent_hole_delay(ip, idx, cur, new,
+				&logflags, rsvd)))
+			goto done;
+	}
+	/*
+	 * Real allocation off the end of the file.
+	 */
+	else if (idx == nextents) {
+		if (cur)
+			ASSERT((cur->bc_private.b.flags &
+				XFS_BTCUR_BPRV_WASDEL) == 0);
+		if ((error = xfs_bmap_add_extent_hole_real(ip, idx, cur, new,
+				&logflags, whichfork)))
+			goto done;
+	} else {
+		xfs_bmbt_irec_t	prev;	/* old extent at offset idx */
+
+		/*
+		 * Get the record referred to by idx.
+		 */
+		xfs_bmbt_get_all(&ifp->if_u1.if_extents[idx], &prev);
+		/*
+		 * If it's a real allocation record, and the new allocation ends
+		 * after the start of the referred to record, then we're filling
+		 * in a delayed or unwritten allocation with a real one, or
+		 * converting real back to unwritten.
+		 */
+		if (!ISNULLSTARTBLOCK(new->br_startblock) &&
+		    new->br_startoff + new->br_blockcount > prev.br_startoff) {
+			if (prev.br_state != XFS_EXT_UNWRITTEN &&
+			    ISNULLSTARTBLOCK(prev.br_startblock)) {
+				da_old = STARTBLOCKVAL(prev.br_startblock);
+				if (cur)
+					ASSERT(cur->bc_private.b.flags &
+						XFS_BTCUR_BPRV_WASDEL);
+				if ((error = xfs_bmap_add_extent_delay_real(ip,
+					idx, &cur, new, &da_new, first, flist,
+					&logflags, rsvd)))
+					goto done;
+			} else if (new->br_state == XFS_EXT_NORM) {
+				ASSERT(new->br_state == XFS_EXT_NORM);
+				if ((error = xfs_bmap_add_extent_unwritten_real(
+					ip, idx, &cur, new, &logflags)))
+					goto done;
+			} else {
+				ASSERT(new->br_state == XFS_EXT_UNWRITTEN);
+				if ((error = xfs_bmap_add_extent_unwritten_real(
+					ip, idx, &cur, new, &logflags)))
+					goto done;
+			}
+			ASSERT(*curp == cur || *curp == NULL);
+		}
+		/*
+		 * Otherwise we're filling in a hole with an allocation.
+		 */
+		else {
+			if (cur)
+				ASSERT((cur->bc_private.b.flags &
+					XFS_BTCUR_BPRV_WASDEL) == 0);
+			if ((error = xfs_bmap_add_extent_hole_real(ip, idx, cur,
+					new, &logflags, whichfork)))
+				goto done;
+		}
+	}
+
+	ASSERT(*curp == cur || *curp == NULL);
+	/*
+	 * Convert to a btree if necessary.
+	 */
+	if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
+	    XFS_IFORK_NEXTENTS(ip, whichfork) > ifp->if_ext_max) {
+		int	tmp_logflags;	/* partial log flag return val */
+
+		ASSERT(cur == NULL);
+		error = xfs_bmap_extents_to_btree(ip->i_transp, ip, first,
+			flist, &cur, da_old > 0, &tmp_logflags, whichfork);
+		logflags |= tmp_logflags;
+		if (error)
+			goto done;
+	}
+	/*
+	 * Adjust for changes in reserved delayed indirect blocks.
+	 * Nothing to do for disk quotas here.
+	 */
+	if (da_old || da_new) {
+		xfs_filblks_t	nblks;
+
+		nblks = da_new;
+		if (cur)
+			nblks += cur->bc_private.b.allocated;
+		ASSERT(nblks <= da_old);
+		if (nblks < da_old)
+			xfs_mod_incore_sb(ip->i_mount, XFS_SBS_FDBLOCKS,
+				(int)(da_old - nblks), rsvd);
+	}
+	/*
+	 * Clear out the allocated field, done with it now in any case.
+	 */
+	if (cur) {
+		cur->bc_private.b.allocated = 0;
+		*curp = cur;
+	}
+done:
+#ifdef DEBUG
+	if (!error)
+		xfs_bmap_check_leaf_extents(*curp, ip, whichfork);
+#endif
+	*logflagsp = logflags;
+	return error;
+}
+
+/*
+ * Called by xfs_bmap_add_extent to handle cases converting a delayed
+ * allocation to a real allocation.
+ */
+STATIC int				/* error */
+xfs_bmap_add_extent_delay_real(
+	xfs_inode_t		*ip,	/* incore inode pointer */
+	xfs_extnum_t		idx,	/* extent number to update/insert */
+	xfs_btree_cur_t		**curp,	/* if *curp is null, not a btree */
+	xfs_bmbt_irec_t		*new,	/* new data to put in extent list */
+	xfs_filblks_t		*dnew,	/* new delayed-alloc indirect blocks */
+	xfs_fsblock_t		*first,	/* pointer to firstblock variable */
+	xfs_bmap_free_t		*flist,	/* list of extents to be freed */
+	int			*logflagsp, /* inode logging flags */
+	int			rsvd)	/* OK to use reserved data block allocation */
+{
+	xfs_bmbt_rec_t		*base;	/* base of extent entry list */
+	xfs_btree_cur_t		*cur;	/* btree cursor */
+	int			diff;	/* temp value */
+	xfs_bmbt_rec_t		*ep;	/* extent entry for idx */
+	int			error;	/* error return value */
+#ifdef XFS_BMAP_TRACE
+	static char		fname[] = "xfs_bmap_add_extent_delay_real";
+#endif
+	int			i;	/* temp state */
+	xfs_fileoff_t		new_endoff;	/* end offset of new entry */
+	xfs_bmbt_irec_t		r[3];	/* neighbor extent entries */
+					/* left is 0, right is 1, prev is 2 */
+	int			rval=0;	/* return value (logging flags) */
+	int			state = 0;/* state bits, accessed thru macros */
+	xfs_filblks_t		temp;	/* value for dnew calculations */
+	xfs_filblks_t		temp2;	/* value for dnew calculations */
+	int			tmp_rval;	/* partial logging flags */
+	enum {				/* bit number definitions for state */
+		LEFT_CONTIG,	RIGHT_CONTIG,
+		LEFT_FILLING,	RIGHT_FILLING,
+		LEFT_DELAY,	RIGHT_DELAY,
+		LEFT_VALID,	RIGHT_VALID
+	};
+
+#define	LEFT		r[0]
+#define	RIGHT		r[1]
+#define	PREV		r[2]
+#define	MASK(b)		(1 << (b))
+#define	MASK2(a,b)	(MASK(a) | MASK(b))
+#define	MASK3(a,b,c)	(MASK2(a,b) | MASK(c))
+#define	MASK4(a,b,c,d)	(MASK3(a,b,c) | MASK(d))
+#define	STATE_SET(b,v)	((v) ? (state |= MASK(b)) : (state &= ~MASK(b)))
+#define	STATE_TEST(b)	(state & MASK(b))
+#define	STATE_SET_TEST(b,v)	((v) ? ((state |= MASK(b)), 1) : \
+				       ((state &= ~MASK(b)), 0))
+#define	SWITCH_STATE		\
+	(state & MASK4(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG))
+
+	/*
+	 * Set up a bunch of variables to make the tests simpler.
+	 */
+	cur = *curp;
+	base = ip->i_df.if_u1.if_extents;
+	ep = &base[idx];
+	xfs_bmbt_get_all(ep, &PREV);
+	new_endoff = new->br_startoff + new->br_blockcount;
+	ASSERT(PREV.br_startoff <= new->br_startoff);
+	ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
+	/*
+	 * Set flags determining what part of the previous delayed allocation
+	 * extent is being replaced by a real allocation.
+	 */
+	STATE_SET(LEFT_FILLING, PREV.br_startoff == new->br_startoff);
+	STATE_SET(RIGHT_FILLING,
+		PREV.br_startoff + PREV.br_blockcount == new_endoff);
+	/*
+	 * Check and set flags if this segment has a left neighbor.
+	 * Don't set contiguous if the combined extent would be too large.
+	 */
+	if (STATE_SET_TEST(LEFT_VALID, idx > 0)) {
+		xfs_bmbt_get_all(ep - 1, &LEFT);
+		STATE_SET(LEFT_DELAY, ISNULLSTARTBLOCK(LEFT.br_startblock));
+	}
+	STATE_SET(LEFT_CONTIG,
+		STATE_TEST(LEFT_VALID) && !STATE_TEST(LEFT_DELAY) &&
+		LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
+		LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
+		LEFT.br_state == new->br_state &&
+		LEFT.br_blockcount + new->br_blockcount <= MAXEXTLEN);
+	/*
+	 * Check and set flags if this segment has a right neighbor.
+	 * Don't set contiguous if the combined extent would be too large.
+	 * Also check for all-three-contiguous being too large.
+	 */
+	if (STATE_SET_TEST(RIGHT_VALID,
+			idx <
+			ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - 1)) {
+		xfs_bmbt_get_all(ep + 1, &RIGHT);
+		STATE_SET(RIGHT_DELAY, ISNULLSTARTBLOCK(RIGHT.br_startblock));
+	}
+	STATE_SET(RIGHT_CONTIG,
+		STATE_TEST(RIGHT_VALID) && !STATE_TEST(RIGHT_DELAY) &&
+		new_endoff == RIGHT.br_startoff &&
+		new->br_startblock + new->br_blockcount ==
+		    RIGHT.br_startblock &&
+		new->br_state == RIGHT.br_state &&
+		new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN &&
+		((state & MASK3(LEFT_CONTIG, LEFT_FILLING, RIGHT_FILLING)) !=
+		  MASK3(LEFT_CONTIG, LEFT_FILLING, RIGHT_FILLING) ||
+		 LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
+		     <= MAXEXTLEN));
+	error = 0;
+	/*
+	 * Switch out based on the FILLING and CONTIG state bits.
+	 */
+	switch (SWITCH_STATE) {
+
+	case MASK4(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
+		/*
+		 * Filling in all of a previously delayed allocation extent.
+		 * The left and right neighbors are both contiguous with new.
+		 */
+		xfs_bmap_trace_pre_update(fname, "LF|RF|LC|RC", ip, idx - 1,
+			XFS_DATA_FORK);
+		xfs_bmbt_set_blockcount(ep - 1,
+			LEFT.br_blockcount + PREV.br_blockcount +
+			RIGHT.br_blockcount);
+		xfs_bmap_trace_post_update(fname, "LF|RF|LC|RC", ip, idx - 1,
+			XFS_DATA_FORK);
+		xfs_bmap_trace_delete(fname, "LF|RF|LC|RC", ip, idx, 2,
+			XFS_DATA_FORK);
+		xfs_bmap_delete_exlist(ip, idx, 2, XFS_DATA_FORK);
+		ip->i_df.if_lastex = idx - 1;
+		ip->i_d.di_nextents--;
+		if (cur == NULL)
+			rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
+		else {
+			rval = XFS_ILOG_CORE;
+			if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
+					RIGHT.br_startblock,
+					RIGHT.br_blockcount, &i)))
+				goto done;
+			ASSERT(i == 1);
+			if ((error = xfs_bmbt_delete(cur, &i)))
+				goto done;
+			ASSERT(i == 1);
+			if ((error = xfs_bmbt_decrement(cur, 0, &i)))
+				goto done;
+			ASSERT(i == 1);
+			if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
+					LEFT.br_startblock,
+					LEFT.br_blockcount +
+					PREV.br_blockcount +
+					RIGHT.br_blockcount, LEFT.br_state)))
+				goto done;
+		}
+		*dnew = 0;
+		break;
+
+	case MASK3(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG):
+		/*
+		 * Filling in all of a previously delayed allocation extent.
+		 * The left neighbor is contiguous, the right is not.
+		 */
+		xfs_bmap_trace_pre_update(fname, "LF|RF|LC", ip, idx - 1,
+			XFS_DATA_FORK);
+		xfs_bmbt_set_blockcount(ep - 1,
+			LEFT.br_blockcount + PREV.br_blockcount);
+		xfs_bmap_trace_post_update(fname, "LF|RF|LC", ip, idx - 1,
+			XFS_DATA_FORK);
+		ip->i_df.if_lastex = idx - 1;
+		xfs_bmap_trace_delete(fname, "LF|RF|LC", ip, idx, 1,
+			XFS_DATA_FORK);
+		xfs_bmap_delete_exlist(ip, idx, 1, XFS_DATA_FORK);
+		if (cur == NULL)
+			rval = XFS_ILOG_DEXT;
+		else {
+			rval = 0;
+			if ((error = xfs_bmbt_lookup_eq(cur, LEFT.br_startoff,
+					LEFT.br_startblock, LEFT.br_blockcount,
+					&i)))
+				goto done;
+			ASSERT(i == 1);
+			if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
+					LEFT.br_startblock,
+					LEFT.br_blockcount +
+					PREV.br_blockcount, LEFT.br_state)))
+				goto done;
+		}
+		*dnew = 0;
+		break;
+
+	case MASK3(LEFT_FILLING, RIGHT_FILLING, RIGHT_CONTIG):
+		/*
+		 * Filling in all of a previously delayed allocation extent.
+		 * The right neighbor is contiguous, the left is not.
+		 */
+		xfs_bmap_trace_pre_update(fname, "LF|RF|RC", ip, idx,
+			XFS_DATA_FORK);
+		xfs_bmbt_set_startblock(ep, new->br_startblock);
+		xfs_bmbt_set_blockcount(ep,
+			PREV.br_blockcount + RIGHT.br_blockcount);
+		xfs_bmap_trace_post_update(fname, "LF|RF|RC", ip, idx,
+			XFS_DATA_FORK);
+		ip->i_df.if_lastex = idx;
+		xfs_bmap_trace_delete(fname, "LF|RF|RC", ip, idx + 1, 1,
+			XFS_DATA_FORK);
+		xfs_bmap_delete_exlist(ip, idx + 1, 1, XFS_DATA_FORK);
+		if (cur == NULL)
+			rval = XFS_ILOG_DEXT;
+		else {
+			rval = 0;
+			if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
+					RIGHT.br_startblock,
+					RIGHT.br_blockcount, &i)))
+				goto done;
+			ASSERT(i == 1);
+			if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
+					new->br_startblock,
+					PREV.br_blockcount +
+					RIGHT.br_blockcount, PREV.br_state)))
+				goto done;
+		}
+		*dnew = 0;
+		break;
+
+	case MASK2(LEFT_FILLING, RIGHT_FILLING):
+		/*
+		 * Filling in all of a previously delayed allocation extent.
+		 * Neither the left nor right neighbors are contiguous with
+		 * the new one.
+		 */
+		xfs_bmap_trace_pre_update(fname, "LF|RF", ip, idx,
+			XFS_DATA_FORK);
+		xfs_bmbt_set_startblock(ep, new->br_startblock);
+		xfs_bmap_trace_post_update(fname, "LF|RF", ip, idx,
+			XFS_DATA_FORK);
+		ip->i_df.if_lastex = idx;
+		ip->i_d.di_nextents++;
+		if (cur == NULL)
+			rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
+		else {
+			rval = XFS_ILOG_CORE;
+			if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
+					new->br_startblock, new->br_blockcount,
+					&i)))
+				goto done;
+			ASSERT(i == 0);
+			cur->bc_rec.b.br_state = XFS_EXT_NORM;
+			if ((error = xfs_bmbt_insert(cur, &i)))
+				goto done;
+			ASSERT(i == 1);
+		}
+		*dnew = 0;
+		break;
+
+	case MASK2(LEFT_FILLING, LEFT_CONTIG):
+		/*
+		 * Filling in the first part of a previous delayed allocation.
+		 * The left neighbor is contiguous.
+		 */
+		xfs_bmap_trace_pre_update(fname, "LF|LC", ip, idx - 1,
+			XFS_DATA_FORK);
+		xfs_bmbt_set_blockcount(ep - 1,
+			LEFT.br_blockcount + new->br_blockcount);
+		xfs_bmbt_set_startoff(ep,
+			PREV.br_startoff + new->br_blockcount);
+		xfs_bmap_trace_post_update(fname, "LF|LC", ip, idx - 1,
+			XFS_DATA_FORK);
+		temp = PREV.br_blockcount - new->br_blockcount;
+		xfs_bmap_trace_pre_update(fname, "LF|LC", ip, idx,
+			XFS_DATA_FORK);
+		xfs_bmbt_set_blockcount(ep, temp);
+		ip->i_df.if_lastex = idx - 1;
+		if (cur == NULL)
+			rval = XFS_ILOG_DEXT;
+		else {
+			rval = 0;
+			if ((error = xfs_bmbt_lookup_eq(cur, LEFT.br_startoff,
+					LEFT.br_startblock, LEFT.br_blockcount,
+					&i)))
+				goto done;
+			ASSERT(i == 1);
+			if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
+					LEFT.br_startblock,
+					LEFT.br_blockcount +
+					new->br_blockcount,
+					LEFT.br_state)))
+				goto done;
+		}
+		temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
+			STARTBLOCKVAL(PREV.br_startblock));
+		xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
+		xfs_bmap_trace_post_update(fname, "LF|LC", ip, idx,
+			XFS_DATA_FORK);
+		*dnew = temp;
+		break;
+
+	case MASK(LEFT_FILLING):
+		/*
+		 * Filling in the first part of a previous delayed allocation.
+		 * The left neighbor is not contiguous.
+		 */
+		xfs_bmap_trace_pre_update(fname, "LF", ip, idx, XFS_DATA_FORK);
+		xfs_bmbt_set_startoff(ep, new_endoff);
+		temp = PREV.br_blockcount - new->br_blockcount;
+		xfs_bmbt_set_blockcount(ep, temp);
+		xfs_bmap_trace_insert(fname, "LF", ip, idx, 1, new, NULL,
+			XFS_DATA_FORK);
+		xfs_bmap_insert_exlist(ip, idx, 1, new, XFS_DATA_FORK);
+		ip->i_df.if_lastex = idx;
+		ip->i_d.di_nextents++;
+		if (cur == NULL)
+			rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
+		else {
+			rval = XFS_ILOG_CORE;
+			if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
+					new->br_startblock, new->br_blockcount,
+					&i)))
+				goto done;
+			ASSERT(i == 0);
+			cur->bc_rec.b.br_state = XFS_EXT_NORM;
+			if ((error = xfs_bmbt_insert(cur, &i)))
+				goto done;
+			ASSERT(i == 1);
+		}
+		if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
+		    ip->i_d.di_nextents > ip->i_df.if_ext_max) {
+			error = xfs_bmap_extents_to_btree(ip->i_transp, ip,
+					first, flist, &cur, 1, &tmp_rval,
+					XFS_DATA_FORK);
+			rval |= tmp_rval;
+			if (error)
+				goto done;
+		}
+		temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
+			STARTBLOCKVAL(PREV.br_startblock) -
+			(cur ? cur->bc_private.b.allocated : 0));
+		base = ip->i_df.if_u1.if_extents;
+		ep = &base[idx + 1];
+		xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
+		xfs_bmap_trace_post_update(fname, "LF", ip, idx + 1,
+			XFS_DATA_FORK);
+		*dnew = temp;
+		break;
+
+	case MASK2(RIGHT_FILLING, RIGHT_CONTIG):
+		/*
+		 * Filling in the last part of a previous delayed allocation.
+		 * The right neighbor is contiguous with the new allocation.
+		 */
+		temp = PREV.br_blockcount - new->br_blockcount;
+		xfs_bmap_trace_pre_update(fname, "RF|RC", ip, idx,
+			XFS_DATA_FORK);
+		xfs_bmap_trace_pre_update(fname, "RF|RC", ip, idx + 1,
+			XFS_DATA_FORK);
+		xfs_bmbt_set_blockcount(ep, temp);
+		xfs_bmbt_set_allf(ep + 1, new->br_startoff, new->br_startblock,
+			new->br_blockcount + RIGHT.br_blockcount,
+			RIGHT.br_state);
+		xfs_bmap_trace_post_update(fname, "RF|RC", ip, idx + 1,
+			XFS_DATA_FORK);
+		ip->i_df.if_lastex = idx + 1;
+		if (cur == NULL)
+			rval = XFS_ILOG_DEXT;
+		else {
+			rval = 0;
+			if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
+					RIGHT.br_startblock,
+					RIGHT.br_blockcount, &i)))
+				goto done;
+			ASSERT(i == 1);
+			if ((error = xfs_bmbt_update(cur, new->br_startoff,
+					new->br_startblock,
+					new->br_blockcount +
+					RIGHT.br_blockcount,
+					RIGHT.br_state)))
+				goto done;
+		}
+		temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
+			STARTBLOCKVAL(PREV.br_startblock));
+		xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
+		xfs_bmap_trace_post_update(fname, "RF|RC", ip, idx,
+			XFS_DATA_FORK);
+		*dnew = temp;
+		break;
+
+	case MASK(RIGHT_FILLING):
+		/*
+		 * Filling in the last part of a previous delayed allocation.
+		 * The right neighbor is not contiguous.
+		 */
+		temp = PREV.br_blockcount - new->br_blockcount;
+		xfs_bmap_trace_pre_update(fname, "RF", ip, idx, XFS_DATA_FORK);
+		xfs_bmbt_set_blockcount(ep, temp);
+		xfs_bmap_trace_insert(fname, "RF", ip, idx + 1, 1,
+			new, NULL, XFS_DATA_FORK);
+		xfs_bmap_insert_exlist(ip, idx + 1, 1, new, XFS_DATA_FORK);
+		ip->i_df.if_lastex = idx + 1;
+		ip->i_d.di_nextents++;
+		if (cur == NULL)
+			rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
+		else {
+			rval = XFS_ILOG_CORE;
+			if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
+					new->br_startblock, new->br_blockcount,
+					&i)))
+				goto done;
+			ASSERT(i == 0);
+			cur->bc_rec.b.br_state = XFS_EXT_NORM;
+			if ((error = xfs_bmbt_insert(cur, &i)))
+				goto done;
+			ASSERT(i == 1);
+		}
+		if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
+		    ip->i_d.di_nextents > ip->i_df.if_ext_max) {
+			error = xfs_bmap_extents_to_btree(ip->i_transp, ip,
+				first, flist, &cur, 1, &tmp_rval,
+				XFS_DATA_FORK);
+			rval |= tmp_rval;
+			if (error)
+				goto done;
+		}
+		temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
+			STARTBLOCKVAL(PREV.br_startblock) -
+			(cur ? cur->bc_private.b.allocated : 0));
+		base = ip->i_df.if_u1.if_extents;
+		ep = &base[idx];
+		xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
+		xfs_bmap_trace_post_update(fname, "RF", ip, idx, XFS_DATA_FORK);
+		*dnew = temp;
+		break;
+
+	case 0:
+		/*
+		 * Filling in the middle part of a previous delayed allocation.
+		 * Contiguity is impossible here.
+		 * This case is avoided almost all the time.
+		 */
+		temp = new->br_startoff - PREV.br_startoff;
+		xfs_bmap_trace_pre_update(fname, "0", ip, idx, XFS_DATA_FORK);
+		xfs_bmbt_set_blockcount(ep, temp);
+		r[0] = *new;
+		r[1].br_startoff = new_endoff;
+		temp2 = PREV.br_startoff + PREV.br_blockcount - new_endoff;
+		r[1].br_blockcount = temp2;
+		xfs_bmap_trace_insert(fname, "0", ip, idx + 1, 2, &r[0], &r[1],
+			XFS_DATA_FORK);
+		xfs_bmap_insert_exlist(ip, idx + 1, 2, &r[0], XFS_DATA_FORK);
+		ip->i_df.if_lastex = idx + 1;
+		ip->i_d.di_nextents++;
+		if (cur == NULL)
+			rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
+		else {
+			rval = XFS_ILOG_CORE;
+			if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
+					new->br_startblock, new->br_blockcount,
+					&i)))
+				goto done;
+			ASSERT(i == 0);
+			cur->bc_rec.b.br_state = XFS_EXT_NORM;
+			if ((error = xfs_bmbt_insert(cur, &i)))
+				goto done;
+			ASSERT(i == 1);
+		}
+		if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
+		    ip->i_d.di_nextents > ip->i_df.if_ext_max) {
+			error = xfs_bmap_extents_to_btree(ip->i_transp, ip,
+					first, flist, &cur, 1, &tmp_rval,
+					XFS_DATA_FORK);
+			rval |= tmp_rval;
+			if (error)
+				goto done;
+		}
+		temp = xfs_bmap_worst_indlen(ip, temp);
+		temp2 = xfs_bmap_worst_indlen(ip, temp2);
+		diff = (int)(temp + temp2 - STARTBLOCKVAL(PREV.br_startblock) -
+			(cur ? cur->bc_private.b.allocated : 0));
+		if (diff > 0 &&
+		    xfs_mod_incore_sb(ip->i_mount, XFS_SBS_FDBLOCKS, -diff, rsvd)) {
+			/*
+			 * Ick gross gag me with a spoon.
+			 */
+			ASSERT(0);	/* want to see if this ever happens! */
+			while (diff > 0) {
+				if (temp) {
+					temp--;
+					diff--;
+					if (!diff ||
+					    !xfs_mod_incore_sb(ip->i_mount,
+						    XFS_SBS_FDBLOCKS, -diff, rsvd))
+						break;
+				}
+				if (temp2) {
+					temp2--;
+					diff--;
+					if (!diff ||
+					    !xfs_mod_incore_sb(ip->i_mount,
+						    XFS_SBS_FDBLOCKS, -diff, rsvd))
+						break;
+				}
+			}
+		}
+		base = ip->i_df.if_u1.if_extents;
+		ep = &base[idx];
+		xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
+		xfs_bmap_trace_post_update(fname, "0", ip, idx, XFS_DATA_FORK);
+		xfs_bmap_trace_pre_update(fname, "0", ip, idx + 2,
+			XFS_DATA_FORK);
+		xfs_bmbt_set_startblock(ep + 2, NULLSTARTBLOCK((int)temp2));
+		xfs_bmap_trace_post_update(fname, "0", ip, idx + 2,
+			XFS_DATA_FORK);
+		*dnew = temp + temp2;
+		break;
+
+	case MASK3(LEFT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
+	case MASK3(RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
+	case MASK2(LEFT_FILLING, RIGHT_CONTIG):
+	case MASK2(RIGHT_FILLING, LEFT_CONTIG):
+	case MASK2(LEFT_CONTIG, RIGHT_CONTIG):
+	case MASK(LEFT_CONTIG):
+	case MASK(RIGHT_CONTIG):
+		/*
+		 * These cases are all impossible.
+		 */
+		ASSERT(0);
+	}
+	*curp = cur;
+done:
+	*logflagsp = rval;
+	return error;
+#undef	LEFT
+#undef	RIGHT
+#undef	PREV
+#undef	MASK
+#undef	MASK2
+#undef	MASK3
+#undef	MASK4
+#undef	STATE_SET
+#undef	STATE_TEST
+#undef	STATE_SET_TEST
+#undef	SWITCH_STATE
+}
+
+/*
+ * Called by xfs_bmap_add_extent to handle cases converting an unwritten
+ * allocation to a real allocation or vice versa.
+ */
+STATIC int				/* error */
+xfs_bmap_add_extent_unwritten_real(
+	xfs_inode_t		*ip,	/* incore inode pointer */
+	xfs_extnum_t		idx,	/* extent number to update/insert */
+	xfs_btree_cur_t		**curp,	/* if *curp is null, not a btree */
+	xfs_bmbt_irec_t		*new,	/* new data to put in extent list */
+	int			*logflagsp) /* inode logging flags */
+{
+	xfs_bmbt_rec_t		*base;	/* base of extent entry list */
+	xfs_btree_cur_t		*cur;	/* btree cursor */
+	xfs_bmbt_rec_t		*ep;	/* extent entry for idx */
+	int			error;	/* error return value */
+#ifdef XFS_BMAP_TRACE
+	static char		fname[] = "xfs_bmap_add_extent_unwritten_real";
+#endif
+	int			i;	/* temp state */
+	xfs_fileoff_t		new_endoff;	/* end offset of new entry */
+	xfs_exntst_t		newext;	/* new extent state */
+	xfs_exntst_t		oldext;	/* old extent state */
+	xfs_bmbt_irec_t		r[3];	/* neighbor extent entries */
+					/* left is 0, right is 1, prev is 2 */
+	int			rval=0;	/* return value (logging flags) */
+	int			state = 0;/* state bits, accessed thru macros */
+	enum {				/* bit number definitions for state */
+		LEFT_CONTIG,	RIGHT_CONTIG,
+		LEFT_FILLING,	RIGHT_FILLING,
+		LEFT_DELAY,	RIGHT_DELAY,
+		LEFT_VALID,	RIGHT_VALID
+	};
+
+#define	LEFT		r[0]
+#define	RIGHT		r[1]
+#define	PREV		r[2]
+#define	MASK(b)		(1 << (b))
+#define	MASK2(a,b)	(MASK(a) | MASK(b))
+#define	MASK3(a,b,c)	(MASK2(a,b) | MASK(c))
+#define	MASK4(a,b,c,d)	(MASK3(a,b,c) | MASK(d))
+#define	STATE_SET(b,v)	((v) ? (state |= MASK(b)) : (state &= ~MASK(b)))
+#define	STATE_TEST(b)	(state & MASK(b))
+#define	STATE_SET_TEST(b,v)	((v) ? ((state |= MASK(b)), 1) : \
+				       ((state &= ~MASK(b)), 0))
+#define	SWITCH_STATE		\
+	(state & MASK4(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG))
+
+	/*
+	 * Set up a bunch of variables to make the tests simpler.
+	 */
+	error = 0;
+	cur = *curp;
+	base = ip->i_df.if_u1.if_extents;
+	ep = &base[idx];
+	xfs_bmbt_get_all(ep, &PREV);
+	newext = new->br_state;
+	oldext = (newext == XFS_EXT_UNWRITTEN) ?
+		XFS_EXT_NORM : XFS_EXT_UNWRITTEN;
+	ASSERT(PREV.br_state == oldext);
+	new_endoff = new->br_startoff + new->br_blockcount;
+	ASSERT(PREV.br_startoff <= new->br_startoff);
+	ASSERT(PREV.br_startoff + PREV.br_blockcount >= new_endoff);
+	/*
+	 * Set flags determining what part of the previous oldext allocation
+	 * extent is being replaced by a newext allocation.
+	 */
+	STATE_SET(LEFT_FILLING, PREV.br_startoff == new->br_startoff);
+	STATE_SET(RIGHT_FILLING,
+		PREV.br_startoff + PREV.br_blockcount == new_endoff);
+	/*
+	 * Check and set flags if this segment has a left neighbor.
+	 * Don't set contiguous if the combined extent would be too large.
+	 */
+	if (STATE_SET_TEST(LEFT_VALID, idx > 0)) {
+		xfs_bmbt_get_all(ep - 1, &LEFT);
+		STATE_SET(LEFT_DELAY, ISNULLSTARTBLOCK(LEFT.br_startblock));
+	}
+	STATE_SET(LEFT_CONTIG,
+		STATE_TEST(LEFT_VALID) && !STATE_TEST(LEFT_DELAY) &&
+		LEFT.br_startoff + LEFT.br_blockcount == new->br_startoff &&
+		LEFT.br_startblock + LEFT.br_blockcount == new->br_startblock &&
+		LEFT.br_state == newext &&
+		LEFT.br_blockcount + new->br_blockcount <= MAXEXTLEN);
+	/*
+	 * Check and set flags if this segment has a right neighbor.
+	 * Don't set contiguous if the combined extent would be too large.
+	 * Also check for all-three-contiguous being too large.
+	 */
+	if (STATE_SET_TEST(RIGHT_VALID,
+			idx <
+			ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - 1)) {
+		xfs_bmbt_get_all(ep + 1, &RIGHT);
+		STATE_SET(RIGHT_DELAY, ISNULLSTARTBLOCK(RIGHT.br_startblock));
+	}
+	STATE_SET(RIGHT_CONTIG,
+		STATE_TEST(RIGHT_VALID) && !STATE_TEST(RIGHT_DELAY) &&
+		new_endoff == RIGHT.br_startoff &&
+		new->br_startblock + new->br_blockcount ==
+		    RIGHT.br_startblock &&
+		newext == RIGHT.br_state &&
+		new->br_blockcount + RIGHT.br_blockcount <= MAXEXTLEN &&
+		((state & MASK3(LEFT_CONTIG, LEFT_FILLING, RIGHT_FILLING)) !=
+		  MASK3(LEFT_CONTIG, LEFT_FILLING, RIGHT_FILLING) ||
+		 LEFT.br_blockcount + new->br_blockcount + RIGHT.br_blockcount
+		     <= MAXEXTLEN));
+	/*
+	 * Switch out based on the FILLING and CONTIG state bits.
+	 */
+	switch (SWITCH_STATE) {
+
+	case MASK4(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
+		/*
+		 * Setting all of a previous oldext extent to newext.
+		 * The left and right neighbors are both contiguous with new.
+		 */
+		xfs_bmap_trace_pre_update(fname, "LF|RF|LC|RC", ip, idx - 1,
+			XFS_DATA_FORK);
+		xfs_bmbt_set_blockcount(ep - 1,
+			LEFT.br_blockcount + PREV.br_blockcount +
+			RIGHT.br_blockcount);
+		xfs_bmap_trace_post_update(fname, "LF|RF|LC|RC", ip, idx - 1,
+			XFS_DATA_FORK);
+		xfs_bmap_trace_delete(fname, "LF|RF|LC|RC", ip, idx, 2,
+			XFS_DATA_FORK);
+		xfs_bmap_delete_exlist(ip, idx, 2, XFS_DATA_FORK);
+		ip->i_df.if_lastex = idx - 1;
+		ip->i_d.di_nextents -= 2;
+		if (cur == NULL)
+			rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
+		else {
+			rval = XFS_ILOG_CORE;
+			if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
+					RIGHT.br_startblock,
+					RIGHT.br_blockcount, &i)))
+				goto done;
+			ASSERT(i == 1);
+			if ((error = xfs_bmbt_delete(cur, &i)))
+				goto done;
+			ASSERT(i == 1);
+			if ((error = xfs_bmbt_decrement(cur, 0, &i)))
+				goto done;
+			ASSERT(i == 1);
+			if ((error = xfs_bmbt_delete(cur, &i)))
+				goto done;
+			ASSERT(i == 1);
+			if ((error = xfs_bmbt_decrement(cur, 0, &i)))
+				goto done;
+			ASSERT(i == 1);
+			if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
+				LEFT.br_startblock,
+				LEFT.br_blockcount + PREV.br_blockcount +
+				RIGHT.br_blockcount, LEFT.br_state)))
+				goto done;
+		}
+		break;
+
+	case MASK3(LEFT_FILLING, RIGHT_FILLING, LEFT_CONTIG):
+		/*
+		 * Setting all of a previous oldext extent to newext.
+		 * The left neighbor is contiguous, the right is not.
+		 */
+		xfs_bmap_trace_pre_update(fname, "LF|RF|LC", ip, idx - 1,
+			XFS_DATA_FORK);
+		xfs_bmbt_set_blockcount(ep - 1,
+			LEFT.br_blockcount + PREV.br_blockcount);
+		xfs_bmap_trace_post_update(fname, "LF|RF|LC", ip, idx - 1,
+			XFS_DATA_FORK);
+		ip->i_df.if_lastex = idx - 1;
+		xfs_bmap_trace_delete(fname, "LF|RF|LC", ip, idx, 1,
+			XFS_DATA_FORK);
+		xfs_bmap_delete_exlist(ip, idx, 1, XFS_DATA_FORK);
+		ip->i_d.di_nextents--;
+		if (cur == NULL)
+			rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
+		else {
+			rval = XFS_ILOG_CORE;
+			if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
+					PREV.br_startblock, PREV.br_blockcount,
+					&i)))
+				goto done;
+			ASSERT(i == 1);
+			if ((error = xfs_bmbt_delete(cur, &i)))
+				goto done;
+			ASSERT(i == 1);
+			if ((error = xfs_bmbt_decrement(cur, 0, &i)))
+				goto done;
+			ASSERT(i == 1);
+			if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
+				LEFT.br_startblock,
+				LEFT.br_blockcount + PREV.br_blockcount,
+				LEFT.br_state)))
+				goto done;
+		}
+		break;
+
+	case MASK3(LEFT_FILLING, RIGHT_FILLING, RIGHT_CONTIG):
+		/*
+		 * Setting all of a previous oldext extent to newext.
+		 * The right neighbor is contiguous, the left is not.
+		 */
+		xfs_bmap_trace_pre_update(fname, "LF|RF|RC", ip, idx,
+			XFS_DATA_FORK);
+		xfs_bmbt_set_blockcount(ep,
+			PREV.br_blockcount + RIGHT.br_blockcount);
+		xfs_bmbt_set_state(ep, newext);
+		xfs_bmap_trace_post_update(fname, "LF|RF|RC", ip, idx,
+			XFS_DATA_FORK);
+		ip->i_df.if_lastex = idx;
+		xfs_bmap_trace_delete(fname, "LF|RF|RC", ip, idx + 1, 1,
+			XFS_DATA_FORK);
+		xfs_bmap_delete_exlist(ip, idx + 1, 1, XFS_DATA_FORK);
+		ip->i_d.di_nextents--;
+		if (cur == NULL)
+			rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
+		else {
+			rval = XFS_ILOG_CORE;
+			if ((error = xfs_bmbt_lookup_eq(cur, RIGHT.br_startoff,
+					RIGHT.br_startblock,
+					RIGHT.br_blockcount, &i)))
+				goto done;
+			ASSERT(i == 1);
+			if ((error = xfs_bmbt_delete(cur, &i)))
+				goto done;
+			ASSERT(i == 1);
+			if ((error = xfs_bmbt_decrement(cur, 0, &i)))
+				goto done;
+			ASSERT(i == 1);
+			if ((error = xfs_bmbt_update(cur, new->br_startoff,
+				new->br_startblock,
+				new->br_blockcount + RIGHT.br_blockcount,
+				newext)))
+				goto done;
+		}
+		break;
+
+	case MASK2(LEFT_FILLING, RIGHT_FILLING):
+		/*
+		 * Setting all of a previous oldext extent to newext.
+		 * Neither the left nor right neighbors are contiguous with
+		 * the new one.
+		 */
+		xfs_bmap_trace_pre_update(fname, "LF|RF", ip, idx,
+			XFS_DATA_FORK);
+		xfs_bmbt_set_state(ep, newext);
+		xfs_bmap_trace_post_update(fname, "LF|RF", ip, idx,
+			XFS_DATA_FORK);
+		ip->i_df.if_lastex = idx;
+		if (cur == NULL)
+			rval = XFS_ILOG_DEXT;
+		else {
+			rval = 0;
+			if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
+					new->br_startblock, new->br_blockcount,
+					&i)))
+				goto done;
+			ASSERT(i == 1);
+			if ((error = xfs_bmbt_update(cur, new->br_startoff,
+				new->br_startblock, new->br_blockcount,
+				newext)))
+				goto done;
+		}
+		break;
+
+	case MASK2(LEFT_FILLING, LEFT_CONTIG):
+		/*
+		 * Setting the first part of a previous oldext extent to newext.
+		 * The left neighbor is contiguous.
+		 */
+		xfs_bmap_trace_pre_update(fname, "LF|LC", ip, idx - 1,
+			XFS_DATA_FORK);
+		xfs_bmbt_set_blockcount(ep - 1,
+			LEFT.br_blockcount + new->br_blockcount);
+		xfs_bmbt_set_startoff(ep,
+			PREV.br_startoff + new->br_blockcount);
+		xfs_bmap_trace_post_update(fname, "LF|LC", ip, idx - 1,
+			XFS_DATA_FORK);
+		xfs_bmap_trace_pre_update(fname, "LF|LC", ip, idx,
+			XFS_DATA_FORK);
+		xfs_bmbt_set_startblock(ep,
+			new->br_startblock + new->br_blockcount);
+		xfs_bmbt_set_blockcount(ep,
+			PREV.br_blockcount - new->br_blockcount);
+		xfs_bmap_trace_post_update(fname, "LF|LC", ip, idx,
+			XFS_DATA_FORK);
+		ip->i_df.if_lastex = idx - 1;
+		if (cur == NULL)
+			rval = XFS_ILOG_DEXT;
+		else {
+			rval = 0;
+			if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
+					PREV.br_startblock, PREV.br_blockcount,
+					&i)))
+				goto done;
+			ASSERT(i == 1);
+			if ((error = xfs_bmbt_update(cur,
+				PREV.br_startoff + new->br_blockcount,
+				PREV.br_startblock + new->br_blockcount,
+				PREV.br_blockcount - new->br_blockcount,
+				oldext)))
+				goto done;
+			if ((error = xfs_bmbt_decrement(cur, 0, &i)))
+				goto done;
+			if (xfs_bmbt_update(cur, LEFT.br_startoff,
+				LEFT.br_startblock,
+				LEFT.br_blockcount + new->br_blockcount,
+				LEFT.br_state))
+				goto done;
+		}
+		break;
+
+	case MASK(LEFT_FILLING):
+		/*
+		 * Setting the first part of a previous oldext extent to newext.
+		 * The left neighbor is not contiguous.
+		 */
+		xfs_bmap_trace_pre_update(fname, "LF", ip, idx, XFS_DATA_FORK);
+		ASSERT(ep && xfs_bmbt_get_state(ep) == oldext);
+		xfs_bmbt_set_startoff(ep, new_endoff);
+		xfs_bmbt_set_blockcount(ep,
+			PREV.br_blockcount - new->br_blockcount);
+		xfs_bmbt_set_startblock(ep,
+			new->br_startblock + new->br_blockcount);
+		xfs_bmap_trace_post_update(fname, "LF", ip, idx, XFS_DATA_FORK);
+		xfs_bmap_trace_insert(fname, "LF", ip, idx, 1, new, NULL,
+			XFS_DATA_FORK);
+		xfs_bmap_insert_exlist(ip, idx, 1, new, XFS_DATA_FORK);
+		ip->i_df.if_lastex = idx;
+		ip->i_d.di_nextents++;
+		if (cur == NULL)
+			rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
+		else {
+			rval = XFS_ILOG_CORE;
+			if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
+					PREV.br_startblock, PREV.br_blockcount,
+					&i)))
+				goto done;
+			ASSERT(i == 1);
+			if ((error = xfs_bmbt_update(cur,
+				PREV.br_startoff + new->br_blockcount,
+				PREV.br_startblock + new->br_blockcount,
+				PREV.br_blockcount - new->br_blockcount,
+				oldext)))
+				goto done;
+			cur->bc_rec.b = *new;
+			if ((error = xfs_bmbt_insert(cur, &i)))
+				goto done;
+			ASSERT(i == 1);
+		}
+		break;
+
+	case MASK2(RIGHT_FILLING, RIGHT_CONTIG):
+		/*
+		 * Setting the last part of a previous oldext extent to newext.
+		 * The right neighbor is contiguous with the new allocation.
+		 */
+		xfs_bmap_trace_pre_update(fname, "RF|RC", ip, idx,
+			XFS_DATA_FORK);
+		xfs_bmap_trace_pre_update(fname, "RF|RC", ip, idx + 1,
+			XFS_DATA_FORK);
+		xfs_bmbt_set_blockcount(ep,
+			PREV.br_blockcount - new->br_blockcount);
+		xfs_bmap_trace_post_update(fname, "RF|RC", ip, idx,
+			XFS_DATA_FORK);
+		xfs_bmbt_set_allf(ep + 1, new->br_startoff, new->br_startblock,
+			new->br_blockcount + RIGHT.br_blockcount, newext);
+		xfs_bmap_trace_post_update(fname, "RF|RC", ip, idx + 1,
+			XFS_DATA_FORK);
+		ip->i_df.if_lastex = idx + 1;
+		if (cur == NULL)
+			rval = XFS_ILOG_DEXT;
+		else {
+			rval = 0;
+			if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
+					PREV.br_startblock,
+					PREV.br_blockcount, &i)))
+				goto done;
+			ASSERT(i == 1);
+			if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
+				PREV.br_startblock,
+				PREV.br_blockcount - new->br_blockcount,
+				oldext)))
+				goto done;
+			if ((error = xfs_bmbt_increment(cur, 0, &i)))
+				goto done;
+			if ((error = xfs_bmbt_update(cur, new->br_startoff,
+				new->br_startblock,
+				new->br_blockcount + RIGHT.br_blockcount,
+				newext)))
+				goto done;
+		}
+		break;
+
+	case MASK(RIGHT_FILLING):
+		/*
+		 * Setting the last part of a previous oldext extent to newext.
+		 * The right neighbor is not contiguous.
+		 */
+		xfs_bmap_trace_pre_update(fname, "RF", ip, idx, XFS_DATA_FORK);
+		xfs_bmbt_set_blockcount(ep,
+			PREV.br_blockcount - new->br_blockcount);
+		xfs_bmap_trace_post_update(fname, "RF", ip, idx, XFS_DATA_FORK);
+		xfs_bmap_trace_insert(fname, "RF", ip, idx + 1, 1,
+			new, NULL, XFS_DATA_FORK);
+		xfs_bmap_insert_exlist(ip, idx + 1, 1, new, XFS_DATA_FORK);
+		ip->i_df.if_lastex = idx + 1;
+		ip->i_d.di_nextents++;
+		if (cur == NULL)
+			rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
+		else {
+			rval = XFS_ILOG_CORE;
+			if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
+					PREV.br_startblock, PREV.br_blockcount,
+					&i)))
+				goto done;
+			ASSERT(i == 1);
+			if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
+				PREV.br_startblock,
+				PREV.br_blockcount - new->br_blockcount,
+				oldext)))
+				goto done;
+			if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
+					new->br_startblock, new->br_blockcount,
+					&i)))
+				goto done;
+			ASSERT(i == 0);
+			cur->bc_rec.b.br_state = XFS_EXT_NORM;
+			if ((error = xfs_bmbt_insert(cur, &i)))
+				goto done;
+			ASSERT(i == 1);
+		}
+		break;
+
+	case 0:
+		/*
+		 * Setting the middle part of a previous oldext extent to
+		 * newext.  Contiguity is impossible here.
+		 * One extent becomes three extents.
+		 */
+		xfs_bmap_trace_pre_update(fname, "0", ip, idx, XFS_DATA_FORK);
+		xfs_bmbt_set_blockcount(ep,
+			new->br_startoff - PREV.br_startoff);
+		xfs_bmap_trace_post_update(fname, "0", ip, idx, XFS_DATA_FORK);
+		r[0] = *new;
+		r[1].br_startoff = new_endoff;
+		r[1].br_blockcount =
+			PREV.br_startoff + PREV.br_blockcount - new_endoff;
+		r[1].br_startblock = new->br_startblock + new->br_blockcount;
+		r[1].br_state = oldext;
+		xfs_bmap_trace_insert(fname, "0", ip, idx + 1, 2, &r[0], &r[1],
+			XFS_DATA_FORK);
+		xfs_bmap_insert_exlist(ip, idx + 1, 2, &r[0], XFS_DATA_FORK);
+		ip->i_df.if_lastex = idx + 1;
+		ip->i_d.di_nextents += 2;
+		if (cur == NULL)
+			rval = XFS_ILOG_CORE | XFS_ILOG_DEXT;
+		else {
+			rval = XFS_ILOG_CORE;
+			if ((error = xfs_bmbt_lookup_eq(cur, PREV.br_startoff,
+					PREV.br_startblock, PREV.br_blockcount,
+					&i)))
+				goto done;
+			ASSERT(i == 1);
+			/* new right extent - oldext */
+			if ((error = xfs_bmbt_update(cur, r[1].br_startoff,
+				r[1].br_startblock, r[1].br_blockcount,
+				r[1].br_state)))
+				goto done;
+			/* new left extent - oldext */
+			PREV.br_blockcount =
+				new->br_startoff - PREV.br_startoff;
+			cur->bc_rec.b = PREV;
+			if ((error = xfs_bmbt_insert(cur, &i)))
+				goto done;
+			ASSERT(i == 1);
+			if ((error = xfs_bmbt_increment(cur, 0, &i)))
+				goto done;
+			ASSERT(i == 1);
+			/* new middle extent - newext */
+			cur->bc_rec.b = *new;
+			if ((error = xfs_bmbt_insert(cur, &i)))
+				goto done;
+			ASSERT(i == 1);
+		}
+		break;
+
+	case MASK3(LEFT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
+	case MASK3(RIGHT_FILLING, LEFT_CONTIG, RIGHT_CONTIG):
+	case MASK2(LEFT_FILLING, RIGHT_CONTIG):
+	case MASK2(RIGHT_FILLING, LEFT_CONTIG):
+	case MASK2(LEFT_CONTIG, RIGHT_CONTIG):
+	case MASK(LEFT_CONTIG):
+	case MASK(RIGHT_CONTIG):
+		/*
+		 * These cases are all impossible.
+		 */
+		ASSERT(0);
+	}
+	*curp = cur;
+done:
+	*logflagsp = rval;
+	return error;
+#undef	LEFT
+#undef	RIGHT
+#undef	PREV
+#undef	MASK
+#undef	MASK2
+#undef	MASK3
+#undef	MASK4
+#undef	STATE_SET
+#undef	STATE_TEST
+#undef	STATE_SET_TEST
+#undef	SWITCH_STATE
+}
+
+/*
+ * Called by xfs_bmap_add_extent to handle cases converting a hole
+ * to a delayed allocation.
+ */
+/*ARGSUSED*/
+STATIC int				/* error */
+xfs_bmap_add_extent_hole_delay(
+	xfs_inode_t		*ip,	/* incore inode pointer */
+	xfs_extnum_t		idx,	/* extent number to update/insert */
+	xfs_btree_cur_t		*cur,	/* if null, not a btree */
+	xfs_bmbt_irec_t		*new,	/* new data to put in extent list */
+	int			*logflagsp, /* inode logging flags */
+	int			rsvd)		/* OK to allocate reserved blocks */
+{
+	xfs_bmbt_rec_t		*base;	/* base of extent entry list */
+	xfs_bmbt_rec_t		*ep;	/* extent list entry for idx */
+#ifdef XFS_BMAP_TRACE
+	static char		fname[] = "xfs_bmap_add_extent_hole_delay";
+#endif
+	xfs_bmbt_irec_t		left;	/* left neighbor extent entry */
+	xfs_filblks_t		newlen=0;	/* new indirect size */
+	xfs_filblks_t		oldlen=0;	/* old indirect size */
+	xfs_bmbt_irec_t		right;	/* right neighbor extent entry */
+	int			state;  /* state bits, accessed thru macros */
+	xfs_filblks_t		temp;	/* temp for indirect calculations */
+	enum {				/* bit number definitions for state */
+		LEFT_CONTIG,	RIGHT_CONTIG,
+		LEFT_DELAY,	RIGHT_DELAY,
+		LEFT_VALID,	RIGHT_VALID
+	};
+
+#define	MASK(b)			(1 << (b))
+#define	MASK2(a,b)		(MASK(a) | MASK(b))
+#define	STATE_SET(b,v)		((v) ? (state |= MASK(b)) : (state &= ~MASK(b)))
+#define	STATE_TEST(b)		(state & MASK(b))
+#define	STATE_SET_TEST(b,v)	((v) ? ((state |= MASK(b)), 1) : \
+				       ((state &= ~MASK(b)), 0))
+#define	SWITCH_STATE		(state & MASK2(LEFT_CONTIG, RIGHT_CONTIG))
+
+	base = ip->i_df.if_u1.if_extents;
+	ep = &base[idx];
+	state = 0;
+	ASSERT(ISNULLSTARTBLOCK(new->br_startblock));
+	/*
+	 * Check and set flags if this segment has a left neighbor
+	 */
+	if (STATE_SET_TEST(LEFT_VALID, idx > 0)) {
+		xfs_bmbt_get_all(ep - 1, &left);
+		STATE_SET(LEFT_DELAY, ISNULLSTARTBLOCK(left.br_startblock));
+	}
+	/*
+	 * Check and set flags if the current (right) segment exists.
+	 * If it doesn't exist, we're converting the hole at end-of-file.
+	 */
+	if (STATE_SET_TEST(RIGHT_VALID,
+			   idx <
+			   ip->i_df.if_bytes / (uint)sizeof(xfs_bmbt_rec_t))) {
+		xfs_bmbt_get_all(ep, &right);
+		STATE_SET(RIGHT_DELAY, ISNULLSTARTBLOCK(right.br_startblock));
+	}
+	/*
+	 * Set contiguity flags on the left and right neighbors.
+	 * Don't let extents get too large, even if the pieces are contiguous.
+	 */
+	STATE_SET(LEFT_CONTIG,
+		STATE_TEST(LEFT_VALID) && STATE_TEST(LEFT_DELAY) &&
+		left.br_startoff + left.br_blockcount == new->br_startoff &&
+		left.br_blockcount + new->br_blockcount <= MAXEXTLEN);
+	STATE_SET(RIGHT_CONTIG,
+		STATE_TEST(RIGHT_VALID) && STATE_TEST(RIGHT_DELAY) &&
+		new->br_startoff + new->br_blockcount == right.br_startoff &&
+		new->br_blockcount + right.br_blockcount <= MAXEXTLEN &&
+		(!STATE_TEST(LEFT_CONTIG) ||
+		 (left.br_blockcount + new->br_blockcount +
+		     right.br_blockcount <= MAXEXTLEN)));
+	/*
+	 * Switch out based on the contiguity flags.
+	 */
+	switch (SWITCH_STATE) {
+
+	case MASK2(LEFT_CONTIG, RIGHT_CONTIG):
+		/*
+		 * New allocation is contiguous with delayed allocations
+		 * on the left and on the right.
+		 * Merge all three into a single extent list entry.
+		 */
+		temp = left.br_blockcount + new->br_blockcount +
+			right.br_blockcount;
+		xfs_bmap_trace_pre_update(fname, "LC|RC", ip, idx - 1,
+			XFS_DATA_FORK);
+		xfs_bmbt_set_blockcount(ep - 1, temp);
+		oldlen = STARTBLOCKVAL(left.br_startblock) +
+			STARTBLOCKVAL(new->br_startblock) +
+			STARTBLOCKVAL(right.br_startblock);
+		newlen = xfs_bmap_worst_indlen(ip, temp);
+		xfs_bmbt_set_startblock(ep - 1, NULLSTARTBLOCK((int)newlen));
+		xfs_bmap_trace_post_update(fname, "LC|RC", ip, idx - 1,
+			XFS_DATA_FORK);
+		xfs_bmap_trace_delete(fname, "LC|RC", ip, idx, 1,
+			XFS_DATA_FORK);
+		xfs_bmap_delete_exlist(ip, idx, 1, XFS_DATA_FORK);
+		ip->i_df.if_lastex = idx - 1;
+		break;
+
+	case MASK(LEFT_CONTIG):
+		/*
+		 * New allocation is contiguous with a delayed allocation
+		 * on the left.
+		 * Merge the new allocation with the left neighbor.
+		 */
+		temp = left.br_blockcount + new->br_blockcount;
+		xfs_bmap_trace_pre_update(fname, "LC", ip, idx - 1,
+			XFS_DATA_FORK);
+		xfs_bmbt_set_blockcount(ep - 1, temp);
+		oldlen = STARTBLOCKVAL(left.br_startblock) +
+			STARTBLOCKVAL(new->br_startblock);
+		newlen = xfs_bmap_worst_indlen(ip, temp);
+		xfs_bmbt_set_startblock(ep - 1, NULLSTARTBLOCK((int)newlen));
+		xfs_bmap_trace_post_update(fname, "LC", ip, idx - 1,
+			XFS_DATA_FORK);
+		ip->i_df.if_lastex = idx - 1;
+		break;
+
+	case MASK(RIGHT_CONTIG):
+		/*
+		 * New allocation is contiguous with a delayed allocation
+		 * on the right.
+		 * Merge the new allocation with the right neighbor.
+		 */
+		xfs_bmap_trace_pre_update(fname, "RC", ip, idx, XFS_DATA_FORK);
+		temp = new->br_blockcount + right.br_blockcount;
+		oldlen = STARTBLOCKVAL(new->br_startblock) +
+			STARTBLOCKVAL(right.br_startblock);
+		newlen = xfs_bmap_worst_indlen(ip, temp);
+		xfs_bmbt_set_allf(ep, new->br_startoff,
+			NULLSTARTBLOCK((int)newlen), temp, right.br_state);
+		xfs_bmap_trace_post_update(fname, "RC", ip, idx, XFS_DATA_FORK);
+		ip->i_df.if_lastex = idx;
+		break;
+
+	case 0:
+		/*
+		 * New allocation is not contiguous with another
+		 * delayed allocation.
+		 * Insert a new entry.
+		 */
+		oldlen = newlen = 0;
+		xfs_bmap_trace_insert(fname, "0", ip, idx, 1, new, NULL,
+			XFS_DATA_FORK);
+		xfs_bmap_insert_exlist(ip, idx, 1, new, XFS_DATA_FORK);
+		ip->i_df.if_lastex = idx;
+		break;
+	}
+	if (oldlen != newlen) {
+		ASSERT(oldlen > newlen);
+		xfs_mod_incore_sb(ip->i_mount, XFS_SBS_FDBLOCKS,
+			(int)(oldlen - newlen), rsvd);
+		/*
+		 * Nothing to do for disk quota accounting here.
+		 */
+	}
+	*logflagsp = 0;
+	return 0;
+#undef	MASK
+#undef	MASK2
+#undef	STATE_SET
+#undef	STATE_TEST
+#undef	STATE_SET_TEST
+#undef	SWITCH_STATE
+}
+
+/*
+ * Called by xfs_bmap_add_extent to handle cases converting a hole
+ * to a real allocation.
+ */
+STATIC int				/* error */
+xfs_bmap_add_extent_hole_real(
+	xfs_inode_t		*ip,	/* incore inode pointer */
+	xfs_extnum_t		idx,	/* extent number to update/insert */
+	xfs_btree_cur_t		*cur,	/* if null, not a btree */
+	xfs_bmbt_irec_t		*new,	/* new data to put in extent list */
+	int			*logflagsp, /* inode logging flags */
+	int			whichfork) /* data or attr fork */
+{
+	xfs_bmbt_rec_t		*ep;	/* pointer to extent entry ins. point */
+	int			error;	/* error return value */
+#ifdef XFS_BMAP_TRACE
+	static char		fname[] = "xfs_bmap_add_extent_hole_real";
+#endif
+	int			i;	/* temp state */
+	xfs_ifork_t		*ifp;	/* inode fork pointer */
+	xfs_bmbt_irec_t		left;	/* left neighbor extent entry */
+	xfs_bmbt_irec_t		right;	/* right neighbor extent entry */
+	int			state;	/* state bits, accessed thru macros */
+	enum {				/* bit number definitions for state */
+		LEFT_CONTIG,	RIGHT_CONTIG,
+		LEFT_DELAY,	RIGHT_DELAY,
+		LEFT_VALID,	RIGHT_VALID
+	};
+
+#define	MASK(b)			(1 << (b))
+#define	MASK2(a,b)		(MASK(a) | MASK(b))
+#define	STATE_SET(b,v)		((v) ? (state |= MASK(b)) : (state &= ~MASK(b)))
+#define	STATE_TEST(b)		(state & MASK(b))
+#define	STATE_SET_TEST(b,v)	((v) ? ((state |= MASK(b)), 1) : \
+				       ((state &= ~MASK(b)), 0))
+#define	SWITCH_STATE		(state & MASK2(LEFT_CONTIG, RIGHT_CONTIG))
+
+	ifp = XFS_IFORK_PTR(ip, whichfork);
+	ASSERT(idx <= ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t));
+	ep = &ifp->if_u1.if_extents[idx];
+	state = 0;
+	/*
+	 * Check and set flags if this segment has a left neighbor.
+	 */
+	if (STATE_SET_TEST(LEFT_VALID, idx > 0)) {
+		xfs_bmbt_get_all(ep - 1, &left);
+		STATE_SET(LEFT_DELAY, ISNULLSTARTBLOCK(left.br_startblock));
+	}
+	/*
+	 * Check and set flags if this segment has a current value.
+	 * Not true if we're inserting into the "hole" at eof.
+	 */
+	if (STATE_SET_TEST(RIGHT_VALID,
+			   idx <
+			   ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t))) {
+		xfs_bmbt_get_all(ep, &right);
+		STATE_SET(RIGHT_DELAY, ISNULLSTARTBLOCK(right.br_startblock));
+	}
+	/*
+	 * We're inserting a real allocation between "left" and "right".
+	 * Set the contiguity flags.  Don't let extents get too large.
+	 */
+	STATE_SET(LEFT_CONTIG,
+		STATE_TEST(LEFT_VALID) && !STATE_TEST(LEFT_DELAY) &&
+		left.br_startoff + left.br_blockcount == new->br_startoff &&
+		left.br_startblock + left.br_blockcount == new->br_startblock &&
+		left.br_state == new->br_state &&
+		left.br_blockcount + new->br_blockcount <= MAXEXTLEN);
+	STATE_SET(RIGHT_CONTIG,
+		STATE_TEST(RIGHT_VALID) && !STATE_TEST(RIGHT_DELAY) &&
+		new->br_startoff + new->br_blockcount == right.br_startoff &&
+		new->br_startblock + new->br_blockcount ==
+		    right.br_startblock &&
+		new->br_state == right.br_state &&
+		new->br_blockcount + right.br_blockcount <= MAXEXTLEN &&
+		(!STATE_TEST(LEFT_CONTIG) ||
+		 left.br_blockcount + new->br_blockcount +
+		     right.br_blockcount <= MAXEXTLEN));
+
+	/*
+	 * Select which case we're in here, and implement it.
+	 */
+	switch (SWITCH_STATE) {
+
+	case MASK2(LEFT_CONTIG, RIGHT_CONTIG):
+		/*
+		 * New allocation is contiguous with real allocations on the
+		 * left and on the right.
+		 * Merge all three into a single extent list entry.
+		 */
+		xfs_bmap_trace_pre_update(fname, "LC|RC", ip, idx - 1,
+			whichfork);
+		xfs_bmbt_set_blockcount(ep - 1,
+			left.br_blockcount + new->br_blockcount +
+			right.br_blockcount);
+		xfs_bmap_trace_post_update(fname, "LC|RC", ip, idx - 1,
+			whichfork);
+		xfs_bmap_trace_delete(fname, "LC|RC", ip,
+			idx, 1, whichfork);
+		xfs_bmap_delete_exlist(ip, idx, 1, whichfork);
+		ifp->if_lastex = idx - 1;
+		XFS_IFORK_NEXT_SET(ip, whichfork,
+			XFS_IFORK_NEXTENTS(ip, whichfork) - 1);
+		if (cur == NULL) {
+			*logflagsp = XFS_ILOG_CORE | XFS_ILOG_FEXT(whichfork);
+			return 0;
+		}
+		*logflagsp = XFS_ILOG_CORE;
+		if ((error = xfs_bmbt_lookup_eq(cur, right.br_startoff,
+				right.br_startblock, right.br_blockcount, &i)))
+			return error;
+		ASSERT(i == 1);
+		if ((error = xfs_bmbt_delete(cur, &i)))
+			return error;
+		ASSERT(i == 1);
+		if ((error = xfs_bmbt_decrement(cur, 0, &i)))
+			return error;
+		ASSERT(i == 1);
+		error = xfs_bmbt_update(cur, left.br_startoff,
+				left.br_startblock,
+				left.br_blockcount + new->br_blockcount +
+				right.br_blockcount, left.br_state);
+		return error;
+
+	case MASK(LEFT_CONTIG):
+		/*
+		 * New allocation is contiguous with a real allocation
+		 * on the left.
+		 * Merge the new allocation with the left neighbor.
+		 */
+		xfs_bmap_trace_pre_update(fname, "LC", ip, idx - 1, whichfork);
+		xfs_bmbt_set_blockcount(ep - 1,
+			left.br_blockcount + new->br_blockcount);
+		xfs_bmap_trace_post_update(fname, "LC", ip, idx - 1, whichfork);
+		ifp->if_lastex = idx - 1;
+		if (cur == NULL) {
+			*logflagsp = XFS_ILOG_FEXT(whichfork);
+			return 0;
+		}
+		*logflagsp = 0;
+		if ((error = xfs_bmbt_lookup_eq(cur, left.br_startoff,
+				left.br_startblock, left.br_blockcount, &i)))
+			return error;
+		ASSERT(i == 1);
+		error = xfs_bmbt_update(cur, left.br_startoff,
+				left.br_startblock,
+				left.br_blockcount + new->br_blockcount,
+				left.br_state);
+		return error;
+
+	case MASK(RIGHT_CONTIG):
+		/*
+		 * New allocation is contiguous with a real allocation
+		 * on the right.
+		 * Merge the new allocation with the right neighbor.
+		 */
+		xfs_bmap_trace_pre_update(fname, "RC", ip, idx, whichfork);
+		xfs_bmbt_set_allf(ep, new->br_startoff, new->br_startblock,
+			new->br_blockcount + right.br_blockcount,
+			right.br_state);
+		xfs_bmap_trace_post_update(fname, "RC", ip, idx, whichfork);
+		ifp->if_lastex = idx;
+		if (cur == NULL) {
+			*logflagsp = XFS_ILOG_FEXT(whichfork);
+			return 0;
+		}
+		*logflagsp = 0;
+		if ((error = xfs_bmbt_lookup_eq(cur, right.br_startoff,
+				right.br_startblock, right.br_blockcount, &i)))
+			return error;
+		ASSERT(i == 1);
+		error = xfs_bmbt_update(cur, new->br_startoff,
+				new->br_startblock,
+				new->br_blockcount + right.br_blockcount,
+				right.br_state);
+		return error;
+
+	case 0:
+		/*
+		 * New allocation is not contiguous with another
+		 * real allocation.
+		 * Insert a new entry.
+		 */
+		xfs_bmap_trace_insert(fname, "0", ip, idx, 1, new, NULL,
+			whichfork);
+		xfs_bmap_insert_exlist(ip, idx, 1, new, whichfork);
+		ifp->if_lastex = idx;
+		XFS_IFORK_NEXT_SET(ip, whichfork,
+			XFS_IFORK_NEXTENTS(ip, whichfork) + 1);
+		if (cur == NULL) {
+			*logflagsp = XFS_ILOG_CORE | XFS_ILOG_FEXT(whichfork);
+			return 0;
+		}
+		*logflagsp = XFS_ILOG_CORE;
+		if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
+				new->br_startblock, new->br_blockcount, &i)))
+			return error;
+		ASSERT(i == 0);
+		cur->bc_rec.b.br_state = new->br_state;
+		if ((error = xfs_bmbt_insert(cur, &i)))
+			return error;
+		ASSERT(i == 1);
+		return 0;
+	}
+#undef	MASK
+#undef	MASK2
+#undef	STATE_SET
+#undef	STATE_TEST
+#undef	STATE_SET_TEST
+#undef	SWITCH_STATE
+	/* NOTREACHED */
+	ASSERT(0);
+	return 0; /* keep gcc quite */
+}
+
+#define XFS_ALLOC_GAP_UNITS	4
+
+/*
+ * xfs_bmap_alloc is called by xfs_bmapi to allocate an extent for a file.
+ * It figures out where to ask the underlying allocator to put the new extent.
+ */
+STATIC int				/* error */
+xfs_bmap_alloc(
+	xfs_bmalloca_t	*ap)		/* bmap alloc argument struct */
+{
+	xfs_fsblock_t	adjust;		/* adjustment to block numbers */
+	xfs_alloctype_t	atype=0;	/* type for allocation routines */
+	int		error;		/* error return value */
+	xfs_agnumber_t	fb_agno;	/* ag number of ap->firstblock */
+	xfs_mount_t	*mp;		/* mount point structure */
+	int		nullfb;		/* true if ap->firstblock isn't set */
+	int		rt;		/* true if inode is realtime */
+#ifdef __KERNEL__
+	xfs_extlen_t	prod=0;		/* product factor for allocators */
+	xfs_extlen_t	ralen=0;	/* realtime allocation length */
+#endif
+
+#define	ISVALID(x,y)	\
+	(rt ? \
+		(x) < mp->m_sb.sb_rblocks : \
+		XFS_FSB_TO_AGNO(mp, x) == XFS_FSB_TO_AGNO(mp, y) && \
+		XFS_FSB_TO_AGNO(mp, x) < mp->m_sb.sb_agcount && \
+		XFS_FSB_TO_AGBNO(mp, x) < mp->m_sb.sb_agblocks)
+
+	/*
+	 * Set up variables.
+	 */
+	mp = ap->ip->i_mount;
+	nullfb = ap->firstblock == NULLFSBLOCK;
+	rt = XFS_IS_REALTIME_INODE(ap->ip) && ap->userdata;
+	fb_agno = nullfb ? NULLAGNUMBER : XFS_FSB_TO_AGNO(mp, ap->firstblock);
+#ifdef __KERNEL__
+	if (rt) {
+		xfs_extlen_t	extsz;		/* file extent size for rt */
+		xfs_fileoff_t	nexto;		/* next file offset */
+		xfs_extlen_t	orig_alen;	/* original ap->alen */
+		xfs_fileoff_t	orig_end;	/* original off+len */
+		xfs_fileoff_t	orig_off;	/* original ap->off */
+		xfs_extlen_t	mod_off;	/* modulus calculations */
+		xfs_fileoff_t	prevo;		/* previous file offset */
+		xfs_rtblock_t	rtx;		/* realtime extent number */
+		xfs_extlen_t	temp;		/* temp for rt calculations */
+
+		/*
+		 * Set prod to match the realtime extent size.
+		 */
+		if (!(extsz = ap->ip->i_d.di_extsize))
+			extsz = mp->m_sb.sb_rextsize;
+		prod = extsz / mp->m_sb.sb_rextsize;
+		orig_off = ap->off;
+		orig_alen = ap->alen;
+		orig_end = orig_off + orig_alen;
+		/*
+		 * If the file offset is unaligned vs. the extent size
+		 * we need to align it.  This will be possible unless
+		 * the file was previously written with a kernel that didn't
+		 * perform this alignment.
+		 */
+		mod_off = do_mod(orig_off, extsz);
+		if (mod_off) {
+			ap->alen += mod_off;
+			ap->off -= mod_off;
+		}
+		/*
+		 * Same adjustment for the end of the requested area.
+		 */
+		if ((temp = (ap->alen % extsz)))
+			ap->alen += extsz - temp;
+		/*
+		 * If the previous block overlaps with this proposed allocation
+		 * then move the start forward without adjusting the length.
+		 */
+		prevo =
+			ap->prevp->br_startoff == NULLFILEOFF ?
+				0 :
+				(ap->prevp->br_startoff +
+				 ap->prevp->br_blockcount);
+		if (ap->off != orig_off && ap->off < prevo)
+			ap->off = prevo;
+		/*
+		 * If the next block overlaps with this proposed allocation
+		 * then move the start back without adjusting the length,
+		 * but not before offset 0.
+		 * This may of course make the start overlap previous block,
+		 * and if we hit the offset 0 limit then the next block
+		 * can still overlap too.
+		 */
+		nexto = (ap->eof || ap->gotp->br_startoff == NULLFILEOFF) ?
+			NULLFILEOFF : ap->gotp->br_startoff;
+		if (!ap->eof &&
+		    ap->off + ap->alen != orig_end &&
+		    ap->off + ap->alen > nexto)
+			ap->off = nexto > ap->alen ? nexto - ap->alen : 0;
+		/*
+		 * If we're now overlapping the next or previous extent that
+		 * means we can't fit an extsz piece in this hole.  Just move
+		 * the start forward to the first valid spot and set
+		 * the length so we hit the end.
+		 */
+		if ((ap->off != orig_off && ap->off < prevo) ||
+		    (ap->off + ap->alen != orig_end &&
+		     ap->off + ap->alen > nexto)) {
+			ap->off = prevo;
+			ap->alen = nexto - prevo;
+		}
+		/*
+		 * If the result isn't a multiple of rtextents we need to
+		 * remove blocks until it is.
+		 */
+		if ((temp = (ap->alen % mp->m_sb.sb_rextsize))) {
+			/*
+			 * We're not covering the original request, or
+			 * we won't be able to once we fix the length.
+			 */
+			if (orig_off < ap->off ||
+			    orig_end > ap->off + ap->alen ||
+			    ap->alen - temp < orig_alen)
+				return XFS_ERROR(EINVAL);
+			/*
+			 * Try to fix it by moving the start up.
+			 */
+			if (ap->off + temp <= orig_off) {
+				ap->alen -= temp;
+				ap->off += temp;
+			}
+			/*
+			 * Try to fix it by moving the end in.
+			 */
+			else if (ap->off + ap->alen - temp >= orig_end)
+				ap->alen -= temp;
+			/*
+			 * Set the start to the minimum then trim the length.
+			 */
+			else {
+				ap->alen -= orig_off - ap->off;
+				ap->off = orig_off;
+				ap->alen -= ap->alen % mp->m_sb.sb_rextsize;
+			}
+			/*
+			 * Result doesn't cover the request, fail it.
+			 */
+			if (orig_off < ap->off || orig_end > ap->off + ap->alen)
+				return XFS_ERROR(EINVAL);
+		}
+		ASSERT(ap->alen % mp->m_sb.sb_rextsize == 0);
+		/*
+		 * If the offset & length are not perfectly aligned
+		 * then kill prod, it will just get us in trouble.
+		 */
+		if (do_mod(ap->off, extsz) || ap->alen % extsz)
+			prod = 1;
+		/*
+		 * Set ralen to be the actual requested length in rtextents.
+		 */
+		ralen = ap->alen / mp->m_sb.sb_rextsize;
+		/*
+		 * If the old value was close enough to MAXEXTLEN that
+		 * we rounded up to it, cut it back so it's valid again.
+		 * Note that if it's a really large request (bigger than
+		 * MAXEXTLEN), we don't hear about that number, and can't
+		 * adjust the starting point to match it.
+		 */
+		if (ralen * mp->m_sb.sb_rextsize >= MAXEXTLEN)
+			ralen = MAXEXTLEN / mp->m_sb.sb_rextsize;
+		/*
+		 * If it's an allocation to an empty file at offset 0,
+		 * pick an extent that will space things out in the rt area.
+		 */
+		if (ap->eof && ap->off == 0) {
+			error = xfs_rtpick_extent(mp, ap->tp, ralen, &rtx);
+			if (error)
+				return error;
+			ap->rval = rtx * mp->m_sb.sb_rextsize;
+		} else
+			ap->rval = 0;
+	}
+#else
+	if (rt)
+		ap->rval = 0;
+#endif	/* __KERNEL__ */
+	else if (nullfb)
+		ap->rval = XFS_INO_TO_FSB(mp, ap->ip->i_ino);
+	else
+		ap->rval = ap->firstblock;
+	/*
+	 * If allocating at eof, and there's a previous real block,
+	 * try to use it's last block as our starting point.
+	 */
+	if (ap->eof && ap->prevp->br_startoff != NULLFILEOFF &&
+	    !ISNULLSTARTBLOCK(ap->prevp->br_startblock) &&
+	    ISVALID(ap->prevp->br_startblock + ap->prevp->br_blockcount,
+		    ap->prevp->br_startblock)) {
+		ap->rval = ap->prevp->br_startblock + ap->prevp->br_blockcount;
+		/*
+		 * Adjust for the gap between prevp and us.
+		 */
+		adjust = ap->off -
+			(ap->prevp->br_startoff + ap->prevp->br_blockcount);
+		if (adjust &&
+		    ISVALID(ap->rval + adjust, ap->prevp->br_startblock))
+			ap->rval += adjust;
+	}
+	/*
+	 * If not at eof, then compare the two neighbor blocks.
+	 * Figure out whether either one gives us a good starting point,
+	 * and pick the better one.
+	 */
+	else if (!ap->eof) {
+		xfs_fsblock_t	gotbno;		/* right side block number */
+		xfs_fsblock_t	gotdiff=0;	/* right side difference */
+		xfs_fsblock_t	prevbno;	/* left side block number */
+		xfs_fsblock_t	prevdiff=0;	/* left side difference */
+
+		/*
+		 * If there's a previous (left) block, select a requested
+		 * start block based on it.
+		 */
+		if (ap->prevp->br_startoff != NULLFILEOFF &&
+		    !ISNULLSTARTBLOCK(ap->prevp->br_startblock) &&
+		    (prevbno = ap->prevp->br_startblock +
+			       ap->prevp->br_blockcount) &&
+		    ISVALID(prevbno, ap->prevp->br_startblock)) {
+			/*
+			 * Calculate gap to end of previous block.
+			 */
+			adjust = prevdiff = ap->off -
+				(ap->prevp->br_startoff +
+				 ap->prevp->br_blockcount);
+			/*
+			 * Figure the startblock based on the previous block's
+			 * end and the gap size.
+			 * Heuristic!
+			 * If the gap is large relative to the piece we're
+			 * allocating, or using it gives us an invalid block
+			 * number, then just use the end of the previous block.
+			 */
+			if (prevdiff <= XFS_ALLOC_GAP_UNITS * ap->alen &&
+			    ISVALID(prevbno + prevdiff,
+				    ap->prevp->br_startblock))
+				prevbno += adjust;
+			else
+				prevdiff += adjust;
+			/*
+			 * If the firstblock forbids it, can't use it,
+			 * must use default.
+			 */
+			if (!rt && !nullfb &&
+			    XFS_FSB_TO_AGNO(mp, prevbno) != fb_agno)
+				prevbno = NULLFSBLOCK;
+		}
+		/*
+		 * No previous block or can't follow it, just default.
+		 */
+		else
+			prevbno = NULLFSBLOCK;
+		/*
+		 * If there's a following (right) block, select a requested
+		 * start block based on it.
+		 */
+		if (!ISNULLSTARTBLOCK(ap->gotp->br_startblock)) {
+			/*
+			 * Calculate gap to start of next block.
+			 */
+			adjust = gotdiff = ap->gotp->br_startoff - ap->off;
+			/*
+			 * Figure the startblock based on the next block's
+			 * start and the gap size.
+			 */
+			gotbno = ap->gotp->br_startblock;
+			/*
+			 * Heuristic!
+			 * If the gap is large relative to the piece we're
+			 * allocating, or using it gives us an invalid block
+			 * number, then just use the start of the next block
+			 * offset by our length.
+			 */
+			if (gotdiff <= XFS_ALLOC_GAP_UNITS * ap->alen &&
+			    ISVALID(gotbno - gotdiff, gotbno))
+				gotbno -= adjust;
+			else if (ISVALID(gotbno - ap->alen, gotbno)) {
+				gotbno -= ap->alen;
+				gotdiff += adjust - ap->alen;
+			} else
+				gotdiff += adjust;
+			/*
+			 * If the firstblock forbids it, can't use it,
+			 * must use default.
+			 */
+			if (!rt && !nullfb &&
+			    XFS_FSB_TO_AGNO(mp, gotbno) != fb_agno)
+				gotbno = NULLFSBLOCK;
+		}
+		/*
+		 * No next block, just default.
+		 */
+		else
+			gotbno = NULLFSBLOCK;
+		/*
+		 * If both valid, pick the better one, else the only good
+		 * one, else ap->rval is already set (to 0 or the inode block).
+		 */
+		if (prevbno != NULLFSBLOCK && gotbno != NULLFSBLOCK)
+			ap->rval = prevdiff <= gotdiff ? prevbno : gotbno;
+		else if (prevbno != NULLFSBLOCK)
+			ap->rval = prevbno;
+		else if (gotbno != NULLFSBLOCK)
+			ap->rval = gotbno;
+	}
+	/*
+	 * If allowed, use ap->rval; otherwise must use firstblock since
+	 * it's in the right allocation group.
+	 */
+	if (nullfb || rt || XFS_FSB_TO_AGNO(mp, ap->rval) == fb_agno)
+		;
+	else
+		ap->rval = ap->firstblock;
+	/*
+	 * Realtime allocation, done through xfs_rtallocate_extent.
+	 */
+	if (rt) {
+#ifndef __KERNEL__
+		ASSERT(0);
+#else
+		xfs_rtblock_t	rtb;
+
+		atype = ap->rval == 0 ?
+			XFS_ALLOCTYPE_ANY_AG : XFS_ALLOCTYPE_NEAR_BNO;
+		do_div(ap->rval, mp->m_sb.sb_rextsize);
+		rtb = ap->rval;
+		ap->alen = ralen;
+		if ((error = xfs_rtallocate_extent(ap->tp, ap->rval, 1, ap->alen,
+				&ralen, atype, ap->wasdel, prod, &rtb)))
+			return error;
+		if (rtb == NULLFSBLOCK && prod > 1 &&
+		    (error = xfs_rtallocate_extent(ap->tp, ap->rval, 1,
+						   ap->alen, &ralen, atype,
+						   ap->wasdel, 1, &rtb)))
+			return error;
+		ap->rval = rtb;
+		if (ap->rval != NULLFSBLOCK) {
+			ap->rval *= mp->m_sb.sb_rextsize;
+			ralen *= mp->m_sb.sb_rextsize;
+			ap->alen = ralen;
+			ap->ip->i_d.di_nblocks += ralen;
+			xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
+			if (ap->wasdel)
+				ap->ip->i_delayed_blks -= ralen;
+			/*
+			 * Adjust the disk quota also. This was reserved
+			 * earlier.
+			 */
+			XFS_TRANS_MOD_DQUOT_BYINO(mp, ap->tp, ap->ip,
+				ap->wasdel ? XFS_TRANS_DQ_DELRTBCOUNT :
+						XFS_TRANS_DQ_RTBCOUNT,
+				(long) ralen);
+		} else
+			ap->alen = 0;
+#endif	/* __KERNEL__ */
+	}
+	/*
+	 * Normal allocation, done through xfs_alloc_vextent.
+	 */
+	else {
+		xfs_agnumber_t	ag;
+		xfs_alloc_arg_t	args;
+		xfs_extlen_t	blen;
+		xfs_extlen_t	delta;
+		int		isaligned;
+		xfs_extlen_t	longest;
+		xfs_extlen_t	need;
+		xfs_extlen_t	nextminlen=0;
+		int		notinit;
+		xfs_perag_t	*pag;
+		xfs_agnumber_t	startag;
+		int		tryagain;
+
+		tryagain = isaligned = 0;
+		args.tp = ap->tp;
+		args.mp = mp;
+		args.fsbno = ap->rval;
+		args.maxlen = MIN(ap->alen, mp->m_sb.sb_agblocks);
+		blen = 0;
+		if (nullfb) {
+			args.type = XFS_ALLOCTYPE_START_BNO;
+			args.total = ap->total;
+			/*
+			 * Find the longest available space.
+			 * We're going to try for the whole allocation at once.
+			 */
+			startag = ag = XFS_FSB_TO_AGNO(mp, args.fsbno);
+			notinit = 0;
+			down_read(&mp->m_peraglock);
+			while (blen < ap->alen) {
+				pag = &mp->m_perag[ag];
+				if (!pag->pagf_init &&
+				    (error = xfs_alloc_pagf_init(mp, args.tp,
+					    ag, XFS_ALLOC_FLAG_TRYLOCK))) {
+					up_read(&mp->m_peraglock);
+					return error;
+				}
+				/*
+				 * See xfs_alloc_fix_freelist...
+				 */
+				if (pag->pagf_init) {
+					need = XFS_MIN_FREELIST_PAG(pag, mp);
+					delta = need > pag->pagf_flcount ?
+						need - pag->pagf_flcount : 0;
+					longest = (pag->pagf_longest > delta) ?
+						(pag->pagf_longest - delta) :
+						(pag->pagf_flcount > 0 ||
+						 pag->pagf_longest > 0);
+					if (blen < longest)
+						blen = longest;
+				} else
+					notinit = 1;
+				if (++ag == mp->m_sb.sb_agcount)
+					ag = 0;
+				if (ag == startag)
+					break;
+			}
+			up_read(&mp->m_peraglock);
+			/*
+			 * Since the above loop did a BUF_TRYLOCK, it is
+			 * possible that there is space for this request.
+			 */
+			if (notinit || blen < ap->minlen)
+				args.minlen = ap->minlen;
+			/*
+			 * If the best seen length is less than the request
+			 * length, use the best as the minimum.
+			 */
+			else if (blen < ap->alen)
+				args.minlen = blen;
+			/*
+			 * Otherwise we've seen an extent as big as alen,
+			 * use that as the minimum.
+			 */
+			else
+				args.minlen = ap->alen;
+		} else if (ap->low) {
+			args.type = XFS_ALLOCTYPE_FIRST_AG;
+			args.total = args.minlen = ap->minlen;
+		} else {
+			args.type = XFS_ALLOCTYPE_NEAR_BNO;
+			args.total = ap->total;
+			args.minlen = ap->minlen;
+		}
+		if (ap->ip->i_d.di_extsize) {
+			args.prod = ap->ip->i_d.di_extsize;
+			if ((args.mod = (xfs_extlen_t)do_mod(ap->off, args.prod)))
+				args.mod = (xfs_extlen_t)(args.prod - args.mod);
+		} else if (mp->m_sb.sb_blocksize >= NBPP) {
+			args.prod = 1;
+			args.mod = 0;
+		} else {
+			args.prod = NBPP >> mp->m_sb.sb_blocklog;
+			if ((args.mod = (xfs_extlen_t)(do_mod(ap->off, args.prod))))
+				args.mod = (xfs_extlen_t)(args.prod - args.mod);
+		}
+		/*
+		 * If we are not low on available data blocks, and the
+		 * underlying logical volume manager is a stripe, and
+		 * the file offset is zero then try to allocate data
+		 * blocks on stripe unit boundary.
+		 * NOTE: ap->aeof is only set if the allocation length
+		 * is >= the stripe unit and the allocation offset is
+		 * at the end of file.
+		 */
+		if (!ap->low && ap->aeof) {
+			if (!ap->off) {
+				args.alignment = mp->m_dalign;
+				atype = args.type;
+				isaligned = 1;
+				/*
+				 * Adjust for alignment
+				 */
+				if (blen > args.alignment && blen <= ap->alen)
+					args.minlen = blen - args.alignment;
+				args.minalignslop = 0;
+			} else {
+				/*
+				 * First try an exact bno allocation.
+				 * If it fails then do a near or start bno
+				 * allocation with alignment turned on.
+				 */
+				atype = args.type;
+				tryagain = 1;
+				args.type = XFS_ALLOCTYPE_THIS_BNO;
+				args.alignment = 1;
+				/*
+				 * Compute the minlen+alignment for the
+				 * next case.  Set slop so that the value
+				 * of minlen+alignment+slop doesn't go up
+				 * between the calls.
+				 */
+				if (blen > mp->m_dalign && blen <= ap->alen)
+					nextminlen = blen - mp->m_dalign;
+				else
+					nextminlen = args.minlen;
+				if (nextminlen + mp->m_dalign > args.minlen + 1)
+					args.minalignslop =
+						nextminlen + mp->m_dalign -
+						args.minlen - 1;
+				else
+					args.minalignslop = 0;
+			}
+		} else {
+			args.alignment = 1;
+			args.minalignslop = 0;
+		}
+		args.minleft = ap->minleft;
+		args.wasdel = ap->wasdel;
+		args.isfl = 0;
+		args.userdata = ap->userdata;
+		if ((error = xfs_alloc_vextent(&args)))
+			return error;
+		if (tryagain && args.fsbno == NULLFSBLOCK) {
+			/*
+			 * Exact allocation failed. Now try with alignment
+			 * turned on.
+			 */
+			args.type = atype;
+			args.fsbno = ap->rval;
+			args.alignment = mp->m_dalign;
+			args.minlen = nextminlen;
+			args.minalignslop = 0;
+			isaligned = 1;
+			if ((error = xfs_alloc_vextent(&args)))
+				return error;
+		}
+		if (isaligned && args.fsbno == NULLFSBLOCK) {
+			/*
+			 * allocation failed, so turn off alignment and
+			 * try again.
+			 */
+			args.type = atype;
+			args.fsbno = ap->rval;
+			args.alignment = 0;
+			if ((error = xfs_alloc_vextent(&args)))
+				return error;
+		}
+		if (args.fsbno == NULLFSBLOCK && nullfb &&
+		    args.minlen > ap->minlen) {
+			args.minlen = ap->minlen;
+			args.type = XFS_ALLOCTYPE_START_BNO;
+			args.fsbno = ap->rval;
+			if ((error = xfs_alloc_vextent(&args)))
+				return error;
+		}
+		if (args.fsbno == NULLFSBLOCK && nullfb) {
+			args.fsbno = 0;
+			args.type = XFS_ALLOCTYPE_FIRST_AG;
+			args.total = ap->minlen;
+			args.minleft = 0;
+			if ((error = xfs_alloc_vextent(&args)))
+				return error;
+			ap->low = 1;
+		}
+		if (args.fsbno != NULLFSBLOCK) {
+			ap->firstblock = ap->rval = args.fsbno;
+			ASSERT(nullfb || fb_agno == args.agno ||
+			       (ap->low && fb_agno < args.agno));
+			ap->alen = args.len;
+			ap->ip->i_d.di_nblocks += args.len;
+			xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
+			if (ap->wasdel)
+				ap->ip->i_delayed_blks -= args.len;
+			/*
+			 * Adjust the disk quota also. This was reserved
+			 * earlier.
+			 */
+			XFS_TRANS_MOD_DQUOT_BYINO(mp, ap->tp, ap->ip,
+				ap->wasdel ? XFS_TRANS_DQ_DELBCOUNT :
+						XFS_TRANS_DQ_BCOUNT,
+				(long) args.len);
+		} else {
+			ap->rval = NULLFSBLOCK;
+			ap->alen = 0;
+		}
+	}
+	return 0;
+#undef	ISVALID
+}
+
+/*
+ * Transform a btree format file with only one leaf node, where the
+ * extents list will fit in the inode, into an extents format file.
+ * Since the extent list is already in-core, all we have to do is
+ * give up the space for the btree root and pitch the leaf block.
+ */
+STATIC int				/* error */
+xfs_bmap_btree_to_extents(
+	xfs_trans_t		*tp,	/* transaction pointer */
+	xfs_inode_t		*ip,	/* incore inode pointer */
+	xfs_btree_cur_t		*cur,	/* btree cursor */
+	int			*logflagsp, /* inode logging flags */
+	int			whichfork)  /* data or attr fork */
+{
+	/* REFERENCED */
+	xfs_bmbt_block_t	*cblock;/* child btree block */
+	xfs_fsblock_t		cbno;	/* child block number */
+	xfs_buf_t		*cbp;	/* child block's buffer */
+	int			error;	/* error return value */
+	xfs_ifork_t		*ifp;	/* inode fork data */
+	xfs_mount_t		*mp;	/* mount point structure */
+	xfs_bmbt_ptr_t		*pp;	/* ptr to block address */
+	xfs_bmbt_block_t	*rblock;/* root btree block */
+
+	ifp = XFS_IFORK_PTR(ip, whichfork);
+	ASSERT(ifp->if_flags & XFS_IFEXTENTS);
+	ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE);
+	rblock = ifp->if_broot;
+	ASSERT(INT_GET(rblock->bb_level, ARCH_CONVERT) == 1);
+	ASSERT(INT_GET(rblock->bb_numrecs, ARCH_CONVERT) == 1);
+	ASSERT(XFS_BMAP_BROOT_MAXRECS(ifp->if_broot_bytes) == 1);
+	mp = ip->i_mount;
+	pp = XFS_BMAP_BROOT_PTR_ADDR(rblock, 1, ifp->if_broot_bytes);
+	*logflagsp = 0;
+#ifdef DEBUG
+	if ((error = xfs_btree_check_lptr(cur, INT_GET(*pp, ARCH_CONVERT), 1)))
+		return error;
+#endif
+	cbno = INT_GET(*pp, ARCH_CONVERT);
+	if ((error = xfs_btree_read_bufl(mp, tp, cbno, 0, &cbp,
+			XFS_BMAP_BTREE_REF)))
+		return error;
+	cblock = XFS_BUF_TO_BMBT_BLOCK(cbp);
+	if ((error = xfs_btree_check_lblock(cur, cblock, 0, cbp)))
+		return error;
+	xfs_bmap_add_free(cbno, 1, cur->bc_private.b.flist, mp);
+	ip->i_d.di_nblocks--;
+	XFS_TRANS_MOD_DQUOT_BYINO(mp, tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
+	xfs_trans_binval(tp, cbp);
+	if (cur->bc_bufs[0] == cbp)
+		cur->bc_bufs[0] = NULL;
+	xfs_iroot_realloc(ip, -1, whichfork);
+	ASSERT(ifp->if_broot == NULL);
+	ASSERT((ifp->if_flags & XFS_IFBROOT) == 0);
+	XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS);
+	*logflagsp = XFS_ILOG_CORE | XFS_ILOG_FEXT(whichfork);
+	return 0;
+}
+
+/*
+ * Called by xfs_bmapi to update extent list structure and the btree
+ * after removing space (or undoing a delayed allocation).
+ */
+STATIC int				/* error */
+xfs_bmap_del_extent(
+	xfs_inode_t		*ip,	/* incore inode pointer */
+	xfs_trans_t		*tp,	/* current transaction pointer */
+	xfs_extnum_t		idx,	/* extent number to update/delete */
+	xfs_bmap_free_t		*flist,	/* list of extents to be freed */
+	xfs_btree_cur_t		*cur,	/* if null, not a btree */
+	xfs_bmbt_irec_t		*del,	/* data to remove from extent list */
+	int			*logflagsp, /* inode logging flags */
+	int			whichfork, /* data or attr fork */
+	int			rsvd)	/* OK to allocate reserved blocks */
+{
+	xfs_filblks_t		da_new;	/* new delay-alloc indirect blocks */
+	xfs_filblks_t		da_old;	/* old delay-alloc indirect blocks */
+	xfs_fsblock_t		del_endblock=0;	/* first block past del */
+	xfs_fileoff_t		del_endoff;	/* first offset past del */
+	int			delay;	/* current block is delayed allocated */
+	int			do_fx;	/* free extent at end of routine */
+	xfs_bmbt_rec_t		*ep;	/* current extent entry pointer */
+	int			error;	/* error return value */
+	int			flags;	/* inode logging flags */
+#ifdef XFS_BMAP_TRACE
+	static char		fname[] = "xfs_bmap_del_extent";
+#endif
+	xfs_bmbt_irec_t		got;	/* current extent entry */
+	xfs_fileoff_t		got_endoff;	/* first offset past got */
+	int			i;	/* temp state */
+	xfs_ifork_t		*ifp;	/* inode fork pointer */
+	xfs_mount_t		*mp;	/* mount structure */
+	xfs_filblks_t		nblks;	/* quota/sb block count */
+	xfs_bmbt_irec_t		new;	/* new record to be inserted */
+	/* REFERENCED */
+	xfs_extnum_t		nextents;	/* number of extents in list */
+	uint			qfield;	/* quota field to update */
+	xfs_filblks_t		temp;	/* for indirect length calculations */
+	xfs_filblks_t		temp2;	/* for indirect length calculations */
+
+	XFS_STATS_INC(xs_del_exlist);
+	mp = ip->i_mount;
+	ifp = XFS_IFORK_PTR(ip, whichfork);
+	nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
+	ASSERT(idx >= 0 && idx < nextents);
+	ASSERT(del->br_blockcount > 0);
+	ep = &ifp->if_u1.if_extents[idx];
+	xfs_bmbt_get_all(ep, &got);
+	ASSERT(got.br_startoff <= del->br_startoff);
+	del_endoff = del->br_startoff + del->br_blockcount;
+	got_endoff = got.br_startoff + got.br_blockcount;
+	ASSERT(got_endoff >= del_endoff);
+	delay = ISNULLSTARTBLOCK(got.br_startblock);
+	ASSERT(ISNULLSTARTBLOCK(del->br_startblock) == delay);
+	flags = 0;
+	qfield = 0;
+	error = 0;
+	/*
+	 * If deleting a real allocation, must free up the disk space.
+	 */
+	if (!delay) {
+		flags = XFS_ILOG_CORE;
+		/*
+		 * Realtime allocation.  Free it and record di_nblocks update.
+		 */
+		if (whichfork == XFS_DATA_FORK &&
+		    (ip->i_d.di_flags & XFS_DIFLAG_REALTIME)) {
+			xfs_fsblock_t	bno;
+			xfs_filblks_t	len;
+
+			ASSERT(do_mod(del->br_blockcount,
+				      mp->m_sb.sb_rextsize) == 0);
+			ASSERT(do_mod(del->br_startblock,
+				      mp->m_sb.sb_rextsize) == 0);
+			bno = del->br_startblock;
+			len = del->br_blockcount;
+			do_div(bno, mp->m_sb.sb_rextsize);
+			do_div(len, mp->m_sb.sb_rextsize);
+			if ((error = xfs_rtfree_extent(ip->i_transp, bno,
+					(xfs_extlen_t)len)))
+				goto done;
+			do_fx = 0;
+			nblks = len * mp->m_sb.sb_rextsize;
+			qfield = XFS_TRANS_DQ_RTBCOUNT;
+		}
+		/*
+		 * Ordinary allocation.
+		 */
+		else {
+			do_fx = 1;
+			nblks = del->br_blockcount;
+			qfield = XFS_TRANS_DQ_BCOUNT;
+		}
+		/*
+		 * Set up del_endblock and cur for later.
+		 */
+		del_endblock = del->br_startblock + del->br_blockcount;
+		if (cur) {
+			if ((error = xfs_bmbt_lookup_eq(cur, got.br_startoff,
+					got.br_startblock, got.br_blockcount,
+					&i)))
+				goto done;
+			ASSERT(i == 1);
+		}
+		da_old = da_new = 0;
+	} else {
+		da_old = STARTBLOCKVAL(got.br_startblock);
+		da_new = 0;
+		nblks = 0;
+		do_fx = 0;
+	}
+	/*
+	 * Set flag value to use in switch statement.
+	 * Left-contig is 2, right-contig is 1.
+	 */
+	switch (((got.br_startoff == del->br_startoff) << 1) |
+		(got_endoff == del_endoff)) {
+	case 3:
+		/*
+		 * Matches the whole extent.  Delete the entry.
+		 */
+		xfs_bmap_trace_delete(fname, "3", ip, idx, 1, whichfork);
+		xfs_bmap_delete_exlist(ip, idx, 1, whichfork);
+		ifp->if_lastex = idx;
+		if (delay)
+			break;
+		XFS_IFORK_NEXT_SET(ip, whichfork,
+			XFS_IFORK_NEXTENTS(ip, whichfork) - 1);
+		flags |= XFS_ILOG_CORE;
+		if (!cur) {
+			flags |= XFS_ILOG_FEXT(whichfork);
+			break;
+		}
+		if ((error = xfs_bmbt_delete(cur, &i)))
+			goto done;
+		ASSERT(i == 1);
+		break;
+
+	case 2:
+		/*
+		 * Deleting the first part of the extent.
+		 */
+		xfs_bmap_trace_pre_update(fname, "2", ip, idx, whichfork);
+		xfs_bmbt_set_startoff(ep, del_endoff);
+		temp = got.br_blockcount - del->br_blockcount;
+		xfs_bmbt_set_blockcount(ep, temp);
+		ifp->if_lastex = idx;
+		if (delay) {
+			temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
+				da_old);
+			xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
+			xfs_bmap_trace_post_update(fname, "2", ip, idx,
+				whichfork);
+			da_new = temp;
+			break;
+		}
+		xfs_bmbt_set_startblock(ep, del_endblock);
+		xfs_bmap_trace_post_update(fname, "2", ip, idx, whichfork);
+		if (!cur) {
+			flags |= XFS_ILOG_FEXT(whichfork);
+			break;
+		}
+		if ((error = xfs_bmbt_update(cur, del_endoff, del_endblock,
+				got.br_blockcount - del->br_blockcount,
+				got.br_state)))
+			goto done;
+		break;
+
+	case 1:
+		/*
+		 * Deleting the last part of the extent.
+		 */
+		temp = got.br_blockcount - del->br_blockcount;
+		xfs_bmap_trace_pre_update(fname, "1", ip, idx, whichfork);
+		xfs_bmbt_set_blockcount(ep, temp);
+		ifp->if_lastex = idx;
+		if (delay) {
+			temp = XFS_FILBLKS_MIN(xfs_bmap_worst_indlen(ip, temp),
+				da_old);
+			xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
+			xfs_bmap_trace_post_update(fname, "1", ip, idx,
+				whichfork);
+			da_new = temp;
+			break;
+		}
+		xfs_bmap_trace_post_update(fname, "1", ip, idx, whichfork);
+		if (!cur) {
+			flags |= XFS_ILOG_FEXT(whichfork);
+			break;
+		}
+		if ((error = xfs_bmbt_update(cur, got.br_startoff,
+				got.br_startblock,
+				got.br_blockcount - del->br_blockcount,
+				got.br_state)))
+			goto done;
+		break;
+
+	case 0:
+		/*
+		 * Deleting the middle of the extent.
+		 */
+		temp = del->br_startoff - got.br_startoff;
+		xfs_bmap_trace_pre_update(fname, "0", ip, idx, whichfork);
+		xfs_bmbt_set_blockcount(ep, temp);
+		new.br_startoff = del_endoff;
+		temp2 = got_endoff - del_endoff;
+		new.br_blockcount = temp2;
+		new.br_state = got.br_state;
+		if (!delay) {
+			new.br_startblock = del_endblock;
+			flags |= XFS_ILOG_CORE;
+			if (cur) {
+				if ((error = xfs_bmbt_update(cur,
+						got.br_startoff,
+						got.br_startblock, temp,
+						got.br_state)))
+					goto done;
+				if ((error = xfs_bmbt_increment(cur, 0, &i)))
+					goto done;
+				cur->bc_rec.b = new;
+				error = xfs_bmbt_insert(cur, &i);
+				if (error && error != ENOSPC)
+					goto done;
+				/*
+				 * If get no-space back from btree insert,
+				 * it tried a split, and we have a zero
+				 * block reservation.
+				 * Fix up our state and return the error.
+				 */
+				if (error == ENOSPC) {
+					/*
+					 * Reset the cursor, don't trust
+					 * it after any insert operation.
+					 */
+					if ((error = xfs_bmbt_lookup_eq(cur,
+							got.br_startoff,
+							got.br_startblock,
+							temp, &i)))
+						goto done;
+					ASSERT(i == 1);
+					/*
+					 * Update the btree record back
+					 * to the original value.
+					 */
+					if ((error = xfs_bmbt_update(cur,
+							got.br_startoff,
+							got.br_startblock,
+							got.br_blockcount,
+							got.br_state)))
+						goto done;
+					/*
+					 * Reset the extent record back
+					 * to the original value.
+					 */
+					xfs_bmbt_set_blockcount(ep,
+						got.br_blockcount);
+					flags = 0;
+					error = XFS_ERROR(ENOSPC);
+					goto done;
+				}
+				ASSERT(i == 1);
+			} else
+				flags |= XFS_ILOG_FEXT(whichfork);
+			XFS_IFORK_NEXT_SET(ip, whichfork,
+				XFS_IFORK_NEXTENTS(ip, whichfork) + 1);
+		} else {
+			ASSERT(whichfork == XFS_DATA_FORK);
+			temp = xfs_bmap_worst_indlen(ip, temp);
+			xfs_bmbt_set_startblock(ep, NULLSTARTBLOCK((int)temp));
+			temp2 = xfs_bmap_worst_indlen(ip, temp2);
+			new.br_startblock = NULLSTARTBLOCK((int)temp2);
+			da_new = temp + temp2;
+			while (da_new > da_old) {
+				if (temp) {
+					temp--;
+					da_new--;
+					xfs_bmbt_set_startblock(ep,
+						NULLSTARTBLOCK((int)temp));
+				}
+				if (da_new == da_old)
+					break;
+				if (temp2) {
+					temp2--;
+					da_new--;
+					new.br_startblock =
+						NULLSTARTBLOCK((int)temp2);
+				}
+			}
+		}
+		xfs_bmap_trace_post_update(fname, "0", ip, idx, whichfork);
+		xfs_bmap_trace_insert(fname, "0", ip, idx + 1, 1, &new, NULL,
+			whichfork);
+		xfs_bmap_insert_exlist(ip, idx + 1, 1, &new, whichfork);
+		ifp->if_lastex = idx + 1;
+		break;
+	}
+	/*
+	 * If we need to, add to list of extents to delete.
+	 */
+	if (do_fx)
+		xfs_bmap_add_free(del->br_startblock, del->br_blockcount, flist,
+			mp);
+	/*
+	 * Adjust inode # blocks in the file.
+	 */
+	if (nblks)
+		ip->i_d.di_nblocks -= nblks;
+	/*
+	 * Adjust quota data.
+	 */
+	if (qfield)
+		XFS_TRANS_MOD_DQUOT_BYINO(mp, tp, ip, qfield, (long)-nblks);
+
+	/*
+	 * Account for change in delayed indirect blocks.
+	 * Nothing to do for disk quota accounting here.
+	 */
+	ASSERT(da_old >= da_new);
+	if (da_old > da_new)
+		xfs_mod_incore_sb(mp, XFS_SBS_FDBLOCKS, (int)(da_old - da_new),
+			rsvd);
+done:
+	*logflagsp = flags;
+	return error;
+}
+
+/*
+ * Remove the entry "free" from the free item list.  Prev points to the
+ * previous entry, unless "free" is the head of the list.
+ */
+STATIC void
+xfs_bmap_del_free(
+	xfs_bmap_free_t		*flist,	/* free item list header */
+	xfs_bmap_free_item_t	*prev,	/* previous item on list, if any */
+	xfs_bmap_free_item_t	*free)	/* list item to be freed */
+{
+	if (prev)
+		prev->xbfi_next = free->xbfi_next;
+	else
+		flist->xbf_first = free->xbfi_next;
+	flist->xbf_count--;
+	kmem_zone_free(xfs_bmap_free_item_zone, free);
+}
+
+/*
+ * Remove count entries from the extents array for inode "ip", starting
+ * at index "idx".  Copies the remaining items down over the deleted ones,
+ * and gives back the excess memory.
+ */
+STATIC void
+xfs_bmap_delete_exlist(
+	xfs_inode_t	*ip,		/* incore inode pointer */
+	xfs_extnum_t	idx,		/* starting delete index */
+	xfs_extnum_t	count,		/* count of items to delete */
+	int		whichfork)	/* data or attr fork */
+{
+	xfs_bmbt_rec_t	*base;		/* base of extent list */
+	xfs_ifork_t	*ifp;		/* inode fork pointer */
+	xfs_extnum_t	nextents;	/* number of extents in list after */
+
+	ifp = XFS_IFORK_PTR(ip, whichfork);
+	ASSERT(ifp->if_flags & XFS_IFEXTENTS);
+	base = ifp->if_u1.if_extents;
+	nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t) - count;
+	memmove(&base[idx], &base[idx + count],
+		(nextents - idx) * sizeof(*base));
+	xfs_iext_realloc(ip, -count, whichfork);
+}
+
+/*
+ * Convert an extents-format file into a btree-format file.
+ * The new file will have a root block (in the inode) and a single child block.
+ */
+STATIC int					/* error */
+xfs_bmap_extents_to_btree(
+	xfs_trans_t		*tp,		/* transaction pointer */
+	xfs_inode_t		*ip,		/* incore inode pointer */
+	xfs_fsblock_t		*firstblock,	/* first-block-allocated */
+	xfs_bmap_free_t		*flist,		/* blocks freed in xaction */
+	xfs_btree_cur_t		**curp,		/* cursor returned to caller */
+	int			wasdel,		/* converting a delayed alloc */
+	int			*logflagsp,	/* inode logging flags */
+	int			whichfork)	/* data or attr fork */
+{
+	xfs_bmbt_block_t	*ablock;	/* allocated (child) bt block */
+	xfs_buf_t		*abp;		/* buffer for ablock */
+	xfs_alloc_arg_t		args;		/* allocation arguments */
+	xfs_bmbt_rec_t		*arp;		/* child record pointer */
+	xfs_bmbt_block_t	*block;		/* btree root block */
+	xfs_btree_cur_t		*cur;		/* bmap btree cursor */
+	xfs_bmbt_rec_t		*ep;		/* extent list pointer */
+	int			error;		/* error return value */
+	xfs_extnum_t		i, cnt;		/* extent list index */
+	xfs_ifork_t		*ifp;		/* inode fork pointer */
+	xfs_bmbt_key_t		*kp;		/* root block key pointer */
+	xfs_mount_t		*mp;		/* mount structure */
+	xfs_extnum_t		nextents;	/* extent list size */
+	xfs_bmbt_ptr_t		*pp;		/* root block address pointer */
+
+	ifp = XFS_IFORK_PTR(ip, whichfork);
+	ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS);
+	ASSERT(ifp->if_ext_max ==
+	       XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
+	/*
+	 * Make space in the inode incore.
+	 */
+	xfs_iroot_realloc(ip, 1, whichfork);
+	ifp->if_flags |= XFS_IFBROOT;
+	/*
+	 * Fill in the root.
+	 */
+	block = ifp->if_broot;
+	INT_SET(block->bb_magic, ARCH_CONVERT, XFS_BMAP_MAGIC);
+	INT_SET(block->bb_level, ARCH_CONVERT, 1);
+	INT_SET(block->bb_numrecs, ARCH_CONVERT, 1);
+	INT_SET(block->bb_leftsib, ARCH_CONVERT, NULLDFSBNO);
+	INT_SET(block->bb_rightsib, ARCH_CONVERT, NULLDFSBNO);
+	/*
+	 * Need a cursor.  Can't allocate until bb_level is filled in.
+	 */
+	mp = ip->i_mount;
+	cur = xfs_btree_init_cursor(mp, tp, NULL, 0, XFS_BTNUM_BMAP, ip,
+		whichfork);
+	cur->bc_private.b.firstblock = *firstblock;
+	cur->bc_private.b.flist = flist;
+	cur->bc_private.b.flags = wasdel ? XFS_BTCUR_BPRV_WASDEL : 0;
+	/*
+	 * Convert to a btree with two levels, one record in root.
+	 */
+	XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_BTREE);
+	args.tp = tp;
+	args.mp = mp;
+	if (*firstblock == NULLFSBLOCK) {
+		args.type = XFS_ALLOCTYPE_START_BNO;
+		args.fsbno = XFS_INO_TO_FSB(mp, ip->i_ino);
+	} else if (flist->xbf_low) {
+		args.type = XFS_ALLOCTYPE_START_BNO;
+		args.fsbno = *firstblock;
+	} else {
+		args.type = XFS_ALLOCTYPE_NEAR_BNO;
+		args.fsbno = *firstblock;
+	}
+	args.minlen = args.maxlen = args.prod = 1;
+	args.total = args.minleft = args.alignment = args.mod = args.isfl =
+		args.minalignslop = 0;
+	args.wasdel = wasdel;
+	*logflagsp = 0;
+	if ((error = xfs_alloc_vextent(&args))) {
+		xfs_iroot_realloc(ip, -1, whichfork);
+		xfs_btree_del_cursor(cur, XFS_BTREE_ERROR);
+		return error;
+	}
+	/*
+	 * Allocation can't fail, the space was reserved.
+	 */
+	ASSERT(args.fsbno != NULLFSBLOCK);
+	ASSERT(*firstblock == NULLFSBLOCK ||
+	       args.agno == XFS_FSB_TO_AGNO(mp, *firstblock) ||
+	       (flist->xbf_low &&
+		args.agno > XFS_FSB_TO_AGNO(mp, *firstblock)));
+	*firstblock = cur->bc_private.b.firstblock = args.fsbno;
+	cur->bc_private.b.allocated++;
+	ip->i_d.di_nblocks++;
+	XFS_TRANS_MOD_DQUOT_BYINO(mp, tp, ip, XFS_TRANS_DQ_BCOUNT, 1L);
+	abp = xfs_btree_get_bufl(mp, tp, args.fsbno, 0);
+	/*
+	 * Fill in the child block.
+	 */
+	ablock = XFS_BUF_TO_BMBT_BLOCK(abp);
+	INT_SET(ablock->bb_magic, ARCH_CONVERT, XFS_BMAP_MAGIC);
+	ablock->bb_level = 0;
+	INT_SET(ablock->bb_leftsib, ARCH_CONVERT, NULLDFSBNO);
+	INT_SET(ablock->bb_rightsib, ARCH_CONVERT, NULLDFSBNO);
+	arp = XFS_BMAP_REC_IADDR(ablock, 1, cur);
+	nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
+	for (ep = ifp->if_u1.if_extents, cnt = i = 0; i < nextents; i++, ep++) {
+		if (!ISNULLSTARTBLOCK(xfs_bmbt_get_startblock(ep))) {
+			arp->l0 = INT_GET(ep->l0, ARCH_CONVERT);
+			arp->l1 = INT_GET(ep->l1, ARCH_CONVERT);
+			arp++; cnt++;
+		}
+	}
+	INT_SET(ablock->bb_numrecs, ARCH_CONVERT, cnt);
+	ASSERT(INT_GET(ablock->bb_numrecs, ARCH_CONVERT) == XFS_IFORK_NEXTENTS(ip, whichfork));
+	/*
+	 * Fill in the root key and pointer.
+	 */
+	kp = XFS_BMAP_KEY_IADDR(block, 1, cur);
+	arp = XFS_BMAP_REC_IADDR(ablock, 1, cur);
+	INT_SET(kp->br_startoff, ARCH_CONVERT, xfs_bmbt_disk_get_startoff(arp));
+	pp = XFS_BMAP_PTR_IADDR(block, 1, cur);
+	INT_SET(*pp, ARCH_CONVERT, args.fsbno);
+	/*
+	 * Do all this logging at the end so that
+	 * the root is at the right level.
+	 */
+	xfs_bmbt_log_block(cur, abp, XFS_BB_ALL_BITS);
+	xfs_bmbt_log_recs(cur, abp, 1, INT_GET(ablock->bb_numrecs, ARCH_CONVERT));
+	ASSERT(*curp == NULL);
+	*curp = cur;
+	*logflagsp = XFS_ILOG_CORE | XFS_ILOG_FBROOT(whichfork);
+	return 0;
+}
+
+/*
+ * Insert new item(s) in the extent list for inode "ip".
+ * Count new items are inserted at offset idx.
+ */
+STATIC void
+xfs_bmap_insert_exlist(
+	xfs_inode_t	*ip,		/* incore inode pointer */
+	xfs_extnum_t	idx,		/* starting index of new items */
+	xfs_extnum_t	count,		/* number of inserted items */
+	xfs_bmbt_irec_t	*new,		/* items to insert */
+	int		whichfork)	/* data or attr fork */
+{
+	xfs_bmbt_rec_t	*base;		/* extent list base */
+	xfs_ifork_t	*ifp;		/* inode fork pointer */
+	xfs_extnum_t	nextents;	/* extent list size */
+	xfs_extnum_t	to;		/* extent list index */
+
+	ifp = XFS_IFORK_PTR(ip, whichfork);
+	ASSERT(ifp->if_flags & XFS_IFEXTENTS);
+	xfs_iext_realloc(ip, count, whichfork);
+	base = ifp->if_u1.if_extents;
+	nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
+	memmove(&base[idx + count], &base[idx],
+		(nextents - (idx + count)) * sizeof(*base));
+	for (to = idx; to < idx + count; to++, new++)
+		xfs_bmbt_set_all(&base[to], new);
+}
+
+/*
+ * Convert a local file to an extents file.
+ * This code is out of bounds for data forks of regular files,
+ * since the file data needs to get logged so things will stay consistent.
+ * (The bmap-level manipulations are ok, though).
+ */
+STATIC int				/* error */
+xfs_bmap_local_to_extents(
+	xfs_trans_t	*tp,		/* transaction pointer */
+	xfs_inode_t	*ip,		/* incore inode pointer */
+	xfs_fsblock_t	*firstblock,	/* first block allocated in xaction */
+	xfs_extlen_t	total,		/* total blocks needed by transaction */
+	int		*logflagsp,	/* inode logging flags */
+	int		whichfork)	/* data or attr fork */
+{
+	int		error;		/* error return value */
+	int		flags;		/* logging flags returned */
+#ifdef XFS_BMAP_TRACE
+	static char	fname[] = "xfs_bmap_local_to_extents";
+#endif
+	xfs_ifork_t	*ifp;		/* inode fork pointer */
+
+	/*
+	 * We don't want to deal with the case of keeping inode data inline yet.
+	 * So sending the data fork of a regular inode is invalid.
+	 */
+	ASSERT(!((ip->i_d.di_mode & S_IFMT) == S_IFREG &&
+		 whichfork == XFS_DATA_FORK));
+	ifp = XFS_IFORK_PTR(ip, whichfork);
+	ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL);
+	flags = 0;
+	error = 0;
+	if (ifp->if_bytes) {
+		xfs_alloc_arg_t	args;	/* allocation arguments */
+		xfs_buf_t	*bp;	/* buffer for extent list block */
+		xfs_bmbt_rec_t	*ep;	/* extent list pointer */
+
+		args.tp = tp;
+		args.mp = ip->i_mount;
+		ASSERT(ifp->if_flags & XFS_IFINLINE);
+		/*
+		 * Allocate a block.  We know we need only one, since the
+		 * file currently fits in an inode.
+		 */
+		if (*firstblock == NULLFSBLOCK) {
+			args.fsbno = XFS_INO_TO_FSB(args.mp, ip->i_ino);
+			args.type = XFS_ALLOCTYPE_START_BNO;
+		} else {
+			args.fsbno = *firstblock;
+			args.type = XFS_ALLOCTYPE_NEAR_BNO;
+		}
+		args.total = total;
+		args.mod = args.minleft = args.alignment = args.wasdel =
+			args.isfl = args.minalignslop = 0;
+		args.minlen = args.maxlen = args.prod = 1;
+		if ((error = xfs_alloc_vextent(&args)))
+			goto done;
+		/*
+		 * Can't fail, the space was reserved.
+		 */
+		ASSERT(args.fsbno != NULLFSBLOCK);
+		ASSERT(args.len == 1);
+		*firstblock = args.fsbno;
+		bp = xfs_btree_get_bufl(args.mp, tp, args.fsbno, 0);
+		memcpy((char *)XFS_BUF_PTR(bp), ifp->if_u1.if_data,
+			ifp->if_bytes);
+		xfs_trans_log_buf(tp, bp, 0, ifp->if_bytes - 1);
+		xfs_idata_realloc(ip, -ifp->if_bytes, whichfork);
+		xfs_iext_realloc(ip, 1, whichfork);
+		ep = ifp->if_u1.if_extents;
+		xfs_bmbt_set_allf(ep, 0, args.fsbno, 1, XFS_EXT_NORM);
+		xfs_bmap_trace_post_update(fname, "new", ip, 0, whichfork);
+		XFS_IFORK_NEXT_SET(ip, whichfork, 1);
+		ip->i_d.di_nblocks = 1;
+		XFS_TRANS_MOD_DQUOT_BYINO(args.mp, tp, ip,
+			XFS_TRANS_DQ_BCOUNT, 1L);
+		flags |= XFS_ILOG_FEXT(whichfork);
+	} else
+		ASSERT(XFS_IFORK_NEXTENTS(ip, whichfork) == 0);
+	ifp->if_flags &= ~XFS_IFINLINE;
+	ifp->if_flags |= XFS_IFEXTENTS;
+	XFS_IFORK_FMT_SET(ip, whichfork, XFS_DINODE_FMT_EXTENTS);
+	flags |= XFS_ILOG_CORE;
+done:
+	*logflagsp = flags;
+	return error;
+}
+
+xfs_bmbt_rec_t *			/* pointer to found extent entry */
+xfs_bmap_do_search_extents(
+	xfs_bmbt_rec_t	*base,		/* base of extent list */
+	xfs_extnum_t	lastx,		/* last extent index used */
+	xfs_extnum_t	nextents,	/* extent list size */
+	xfs_fileoff_t	bno,		/* block number searched for */
+	int		*eofp,		/* out: end of file found */
+	xfs_extnum_t	*lastxp,	/* out: last extent index */
+	xfs_bmbt_irec_t	*gotp,		/* out: extent entry found */
+	xfs_bmbt_irec_t	*prevp)		/* out: previous extent entry found */
+{
+	xfs_bmbt_rec_t	*ep;		/* extent list entry pointer */
+	xfs_bmbt_irec_t	got;		/* extent list entry, decoded */
+	int		high;		/* high index of binary search */
+	int		low;		/* low index of binary search */
+
+	/*
+	 * Initialize the extent entry structure to catch access to
+	 * uninitialized br_startblock field.
+	 */
+	got.br_startoff = 0xffa5a5a5a5a5a5a5LL;
+	got.br_blockcount = 0xa55a5a5a5a5a5a5aLL;
+	got.br_state = XFS_EXT_INVALID;
+
+#if XFS_BIG_BLKNOS
+	got.br_startblock = 0xffffa5a5a5a5a5a5LL;
+#else
+	got.br_startblock = 0xffffa5a5;
+#endif
+
+	if (lastx != NULLEXTNUM && lastx < nextents)
+		ep = base + lastx;
+	else
+		ep = NULL;
+	prevp->br_startoff = NULLFILEOFF;
+	if (ep && bno >= (got.br_startoff = xfs_bmbt_get_startoff(ep)) &&
+	    bno < got.br_startoff +
+		  (got.br_blockcount = xfs_bmbt_get_blockcount(ep)))
+		*eofp = 0;
+	else if (ep && lastx < nextents - 1 &&
+		 bno >= (got.br_startoff = xfs_bmbt_get_startoff(ep + 1)) &&
+		 bno < got.br_startoff +
+		       (got.br_blockcount = xfs_bmbt_get_blockcount(ep + 1))) {
+		lastx++;
+		ep++;
+		*eofp = 0;
+	} else if (nextents == 0)
+		*eofp = 1;
+	else if (bno == 0 &&
+		 (got.br_startoff = xfs_bmbt_get_startoff(base)) == 0) {
+		ep = base;
+		lastx = 0;
+		got.br_blockcount = xfs_bmbt_get_blockcount(ep);
+		*eofp = 0;
+	} else {
+		/* binary search the extents array */
+		low = 0;
+		high = nextents - 1;
+		while (low <= high) {
+			XFS_STATS_INC(xs_cmp_exlist);
+			lastx = (low + high) >> 1;
+			ep = base + lastx;
+			got.br_startoff = xfs_bmbt_get_startoff(ep);
+			got.br_blockcount = xfs_bmbt_get_blockcount(ep);
+			if (bno < got.br_startoff)
+				high = lastx - 1;
+			else if (bno >= got.br_startoff + got.br_blockcount)
+				low = lastx + 1;
+			else {
+				got.br_startblock = xfs_bmbt_get_startblock(ep);
+				got.br_state = xfs_bmbt_get_state(ep);
+				*eofp = 0;
+				*lastxp = lastx;
+				*gotp = got;
+				return ep;
+			}
+		}
+		if (bno >= got.br_startoff + got.br_blockcount) {
+			lastx++;
+			if (lastx == nextents) {
+				*eofp = 1;
+				got.br_startblock = xfs_bmbt_get_startblock(ep);
+				got.br_state = xfs_bmbt_get_state(ep);
+				*prevp = got;
+				ep = NULL;
+			} else {
+				*eofp = 0;
+				xfs_bmbt_get_all(ep, prevp);
+				ep++;
+				got.br_startoff = xfs_bmbt_get_startoff(ep);
+				got.br_blockcount = xfs_bmbt_get_blockcount(ep);
+			}
+		} else {
+			*eofp = 0;
+			if (ep > base)
+				xfs_bmbt_get_all(ep - 1, prevp);
+		}
+	}
+	if (ep) {
+		got.br_startblock = xfs_bmbt_get_startblock(ep);
+		got.br_state = xfs_bmbt_get_state(ep);
+	}
+	*lastxp = lastx;
+	*gotp = got;
+	return ep;
+}
+
+/*
+ * Search the extents list for the inode, for the extent containing bno.
+ * If bno lies in a hole, point to the next entry.  If bno lies past eof,
+ * *eofp will be set, and *prevp will contain the last entry (null if none).
+ * Else, *lastxp will be set to the index of the found
+ * entry; *gotp will contain the entry.
+ */
+STATIC xfs_bmbt_rec_t *                 /* pointer to found extent entry */
+xfs_bmap_search_extents(
+	xfs_inode_t     *ip,            /* incore inode pointer */
+	xfs_fileoff_t   bno,            /* block number searched for */
+	int             whichfork,      /* data or attr fork */
+	int             *eofp,          /* out: end of file found */
+	xfs_extnum_t    *lastxp,        /* out: last extent index */
+	xfs_bmbt_irec_t *gotp,          /* out: extent entry found */
+	xfs_bmbt_irec_t *prevp)         /* out: previous extent entry found */
+{
+	xfs_ifork_t	*ifp;		/* inode fork pointer */
+	xfs_bmbt_rec_t  *base;          /* base of extent list */
+	xfs_extnum_t    lastx;          /* last extent index used */
+	xfs_extnum_t    nextents;       /* extent list size */
+	xfs_bmbt_rec_t  *ep;            /* extent list entry pointer */
+	int		rt;		/* realtime flag    */
+
+	XFS_STATS_INC(xs_look_exlist);
+	ifp = XFS_IFORK_PTR(ip, whichfork);
+	lastx = ifp->if_lastex;
+	nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
+	base = &ifp->if_u1.if_extents[0];
+
+	ep = xfs_bmap_do_search_extents(base, lastx, nextents, bno, eofp,
+					  lastxp, gotp, prevp);
+	rt = ip->i_d.di_flags & XFS_DIFLAG_REALTIME;
+	if(!rt && !gotp->br_startblock && (*lastxp != NULLEXTNUM)) {
+                cmn_err(CE_PANIC,"Access to block zero: fs: <%s> inode: %lld "
+			"start_block : %llx start_off : %llx blkcnt : %llx "
+			"extent-state : %x \n",
+			(ip->i_mount)->m_fsname,(long long)ip->i_ino,
+			gotp->br_startblock, gotp->br_startoff,
+			gotp->br_blockcount,gotp->br_state);
+        }
+        return ep;
+}
+
+
+#ifdef XFS_BMAP_TRACE
+ktrace_t	*xfs_bmap_trace_buf;
+
+/*
+ * Add a bmap trace buffer entry.  Base routine for the others.
+ */
+STATIC void
+xfs_bmap_trace_addentry(
+	int		opcode,		/* operation */
+	char		*fname,		/* function name */
+	char		*desc,		/* operation description */
+	xfs_inode_t	*ip,		/* incore inode pointer */
+	xfs_extnum_t	idx,		/* index of entry(ies) */
+	xfs_extnum_t	cnt,		/* count of entries, 1 or 2 */
+	xfs_bmbt_rec_t	*r1,		/* first record */
+	xfs_bmbt_rec_t	*r2,		/* second record or null */
+	int		whichfork)	/* data or attr fork */
+{
+	xfs_bmbt_rec_t	tr2;
+
+	ASSERT(cnt == 1 || cnt == 2);
+	ASSERT(r1 != NULL);
+	if (cnt == 1) {
+		ASSERT(r2 == NULL);
+		r2 = &tr2;
+		memset(&tr2, 0, sizeof(tr2));
+	} else
+		ASSERT(r2 != NULL);
+	ktrace_enter(xfs_bmap_trace_buf,
+		(void *)(__psint_t)(opcode | (whichfork << 16)),
+		(void *)fname, (void *)desc, (void *)ip,
+		(void *)(__psint_t)idx,
+		(void *)(__psint_t)cnt,
+		(void *)(__psunsigned_t)(ip->i_ino >> 32),
+		(void *)(__psunsigned_t)(unsigned)ip->i_ino,
+		(void *)(__psunsigned_t)(r1->l0 >> 32),
+		(void *)(__psunsigned_t)(unsigned)(r1->l0),
+		(void *)(__psunsigned_t)(r1->l1 >> 32),
+		(void *)(__psunsigned_t)(unsigned)(r1->l1),
+		(void *)(__psunsigned_t)(r2->l0 >> 32),
+		(void *)(__psunsigned_t)(unsigned)(r2->l0),
+		(void *)(__psunsigned_t)(r2->l1 >> 32),
+		(void *)(__psunsigned_t)(unsigned)(r2->l1)
+		);
+	ASSERT(ip->i_xtrace);
+	ktrace_enter(ip->i_xtrace,
+		(void *)(__psint_t)(opcode | (whichfork << 16)),
+		(void *)fname, (void *)desc, (void *)ip,
+		(void *)(__psint_t)idx,
+		(void *)(__psint_t)cnt,
+		(void *)(__psunsigned_t)(ip->i_ino >> 32),
+		(void *)(__psunsigned_t)(unsigned)ip->i_ino,
+		(void *)(__psunsigned_t)(r1->l0 >> 32),
+		(void *)(__psunsigned_t)(unsigned)(r1->l0),
+		(void *)(__psunsigned_t)(r1->l1 >> 32),
+		(void *)(__psunsigned_t)(unsigned)(r1->l1),
+		(void *)(__psunsigned_t)(r2->l0 >> 32),
+		(void *)(__psunsigned_t)(unsigned)(r2->l0),
+		(void *)(__psunsigned_t)(r2->l1 >> 32),
+		(void *)(__psunsigned_t)(unsigned)(r2->l1)
+		);
+}
+
+/*
+ * Add bmap trace entry prior to a call to xfs_bmap_delete_exlist.
+ */
+STATIC void
+xfs_bmap_trace_delete(
+	char		*fname,		/* function name */
+	char		*desc,		/* operation description */
+	xfs_inode_t	*ip,		/* incore inode pointer */
+	xfs_extnum_t	idx,		/* index of entry(entries) deleted */
+	xfs_extnum_t	cnt,		/* count of entries deleted, 1 or 2 */
+	int		whichfork)	/* data or attr fork */
+{
+	xfs_ifork_t	*ifp;		/* inode fork pointer */
+
+	ifp = XFS_IFORK_PTR(ip, whichfork);
+	xfs_bmap_trace_addentry(XFS_BMAP_KTRACE_DELETE, fname, desc, ip, idx,
+		cnt, &ifp->if_u1.if_extents[idx],
+		cnt == 2 ? &ifp->if_u1.if_extents[idx + 1] : NULL,
+		whichfork);
+}
+
+/*
+ * Add bmap trace entry prior to a call to xfs_bmap_insert_exlist, or
+ * reading in the extents list from the disk (in the btree).
+ */
+STATIC void
+xfs_bmap_trace_insert(
+	char		*fname,		/* function name */
+	char		*desc,		/* operation description */
+	xfs_inode_t	*ip,		/* incore inode pointer */
+	xfs_extnum_t	idx,		/* index of entry(entries) inserted */
+	xfs_extnum_t	cnt,		/* count of entries inserted, 1 or 2 */
+	xfs_bmbt_irec_t	*r1,		/* inserted record 1 */
+	xfs_bmbt_irec_t	*r2,		/* inserted record 2 or null */
+	int		whichfork)	/* data or attr fork */
+{
+	xfs_bmbt_rec_t	tr1;		/* compressed record 1 */
+	xfs_bmbt_rec_t	tr2;		/* compressed record 2 if needed */
+
+	xfs_bmbt_set_all(&tr1, r1);
+	if (cnt == 2) {
+		ASSERT(r2 != NULL);
+		xfs_bmbt_set_all(&tr2, r2);
+	} else {
+		ASSERT(cnt == 1);
+		ASSERT(r2 == NULL);
+	}
+	xfs_bmap_trace_addentry(XFS_BMAP_KTRACE_INSERT, fname, desc, ip, idx,
+		cnt, &tr1, cnt == 2 ? &tr2 : NULL, whichfork);
+}
+
+/*
+ * Add bmap trace entry after updating an extent list entry in place.
+ */
+STATIC void
+xfs_bmap_trace_post_update(
+	char		*fname,		/* function name */
+	char		*desc,		/* operation description */
+	xfs_inode_t	*ip,		/* incore inode pointer */
+	xfs_extnum_t	idx,		/* index of entry updated */
+	int		whichfork)	/* data or attr fork */
+{
+	xfs_ifork_t	*ifp;		/* inode fork pointer */
+
+	ifp = XFS_IFORK_PTR(ip, whichfork);
+	xfs_bmap_trace_addentry(XFS_BMAP_KTRACE_POST_UP, fname, desc, ip, idx,
+		1, &ifp->if_u1.if_extents[idx], NULL, whichfork);
+}
+
+/*
+ * Add bmap trace entry prior to updating an extent list entry in place.
+ */
+STATIC void
+xfs_bmap_trace_pre_update(
+	char		*fname,		/* function name */
+	char		*desc,		/* operation description */
+	xfs_inode_t	*ip,		/* incore inode pointer */
+	xfs_extnum_t	idx,		/* index of entry to be updated */
+	int		whichfork)	/* data or attr fork */
+{
+	xfs_ifork_t	*ifp;		/* inode fork pointer */
+
+	ifp = XFS_IFORK_PTR(ip, whichfork);
+	xfs_bmap_trace_addentry(XFS_BMAP_KTRACE_PRE_UP, fname, desc, ip, idx, 1,
+		&ifp->if_u1.if_extents[idx], NULL, whichfork);
+}
+#endif	/* XFS_BMAP_TRACE */
+
+/*
+ * Compute the worst-case number of indirect blocks that will be used
+ * for ip's delayed extent of length "len".
+ */
+STATIC xfs_filblks_t
+xfs_bmap_worst_indlen(
+	xfs_inode_t	*ip,		/* incore inode pointer */
+	xfs_filblks_t	len)		/* delayed extent length */
+{
+	int		level;		/* btree level number */
+	int		maxrecs;	/* maximum record count at this level */
+	xfs_mount_t	*mp;		/* mount structure */
+	xfs_filblks_t	rval;		/* return value */
+
+	mp = ip->i_mount;
+	maxrecs = mp->m_bmap_dmxr[0];
+	for (level = 0, rval = 0;
+	     level < XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK);
+	     level++) {
+		len += maxrecs - 1;
+		do_div(len, maxrecs);
+		rval += len;
+		if (len == 1)
+			return rval + XFS_BM_MAXLEVELS(mp, XFS_DATA_FORK) -
+				level - 1;
+		if (level == 0)
+			maxrecs = mp->m_bmap_dmxr[1];
+	}
+	return rval;
+}
+
+#if defined(XFS_RW_TRACE)
+STATIC void
+xfs_bunmap_trace(
+	xfs_inode_t		*ip,
+	xfs_fileoff_t		bno,
+	xfs_filblks_t		len,
+	int			flags,
+	inst_t			*ra)
+{
+	if (ip->i_rwtrace == NULL)
+		return;
+	ktrace_enter(ip->i_rwtrace,
+		(void *)(__psint_t)XFS_BUNMAPI,
+		(void *)ip,
+		(void *)(__psint_t)((ip->i_d.di_size >> 32) & 0xffffffff),
+		(void *)(__psint_t)(ip->i_d.di_size & 0xffffffff),
+		(void *)(__psint_t)(((xfs_dfiloff_t)bno >> 32) & 0xffffffff),
+		(void *)(__psint_t)((xfs_dfiloff_t)bno & 0xffffffff),
+		(void *)(__psint_t)len,
+		(void *)(__psint_t)flags,
+		(void *)(unsigned long)current_cpu(),
+		(void *)ra,
+		(void *)0,
+		(void *)0,
+		(void *)0,
+		(void *)0,
+		(void *)0,
+		(void *)0);
+}
+#endif
+
+/*
+ * Convert inode from non-attributed to attributed.
+ * Must not be in a transaction, ip must not be locked.
+ */
+int						/* error code */
+xfs_bmap_add_attrfork(
+	xfs_inode_t		*ip,		/* incore inode pointer */
+	int			rsvd)		/* OK to allocated reserved blocks in trans */
+{
+	int			blks;		/* space reservation */
+	int			committed;	/* xaction was committed */
+	int			error;		/* error return value */
+	xfs_fsblock_t		firstblock;	/* 1st block/ag allocated */
+	xfs_bmap_free_t		flist;		/* freed extent list */
+	int			logflags;	/* logging flags */
+	xfs_mount_t		*mp;		/* mount structure */
+	unsigned long		s;		/* spinlock spl value */
+	xfs_trans_t		*tp;		/* transaction pointer */
+
+	ASSERT(ip->i_df.if_ext_max ==
+	       XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
+	if (XFS_IFORK_Q(ip))
+		return 0;
+	mp = ip->i_mount;
+	ASSERT(!XFS_NOT_DQATTACHED(mp, ip));
+	tp = xfs_trans_alloc(mp, XFS_TRANS_ADDAFORK);
+	blks = XFS_ADDAFORK_SPACE_RES(mp);
+	if (rsvd)
+		tp->t_flags |= XFS_TRANS_RESERVE;
+	if ((error = xfs_trans_reserve(tp, blks, XFS_ADDAFORK_LOG_RES(mp), 0,
+			XFS_TRANS_PERM_LOG_RES, XFS_ADDAFORK_LOG_COUNT)))
+		goto error0;
+	xfs_ilock(ip, XFS_ILOCK_EXCL);
+	error = XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, tp, ip, blks, 0, rsvd ?
+			XFS_QMOPT_RES_REGBLKS | XFS_QMOPT_FORCE_RES :
+			XFS_QMOPT_RES_REGBLKS);
+	if (error) {
+		xfs_iunlock(ip, XFS_ILOCK_EXCL);
+		xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES);
+		return error;
+	}
+	if (XFS_IFORK_Q(ip))
+		goto error1;
+	if (ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS) {
+		/*
+		 * For inodes coming from pre-6.2 filesystems.
+		 */
+		ASSERT(ip->i_d.di_aformat == 0);
+		ip->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS;
+	}
+	ASSERT(ip->i_d.di_anextents == 0);
+	VN_HOLD(XFS_ITOV(ip));
+	xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
+	xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
+	switch (ip->i_d.di_format) {
+	case XFS_DINODE_FMT_DEV:
+		ip->i_d.di_forkoff = roundup(sizeof(xfs_dev_t), 8) >> 3;
+		break;
+	case XFS_DINODE_FMT_UUID:
+		ip->i_d.di_forkoff = roundup(sizeof(uuid_t), 8) >> 3;
+		break;
+	case XFS_DINODE_FMT_LOCAL:
+	case XFS_DINODE_FMT_EXTENTS:
+	case XFS_DINODE_FMT_BTREE:
+		ip->i_d.di_forkoff = mp->m_attroffset >> 3;
+		break;
+	default:
+		ASSERT(0);
+		error = XFS_ERROR(EINVAL);
+		goto error1;
+	}
+	ip->i_df.if_ext_max =
+		XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t);
+	ASSERT(ip->i_afp == NULL);
+	ip->i_afp = kmem_zone_zalloc(xfs_ifork_zone, KM_SLEEP);
+	ip->i_afp->if_ext_max =
+		XFS_IFORK_ASIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t);
+	ip->i_afp->if_flags = XFS_IFEXTENTS;
+	logflags = 0;
+	XFS_BMAP_INIT(&flist, &firstblock);
+	switch (ip->i_d.di_format) {
+	case XFS_DINODE_FMT_LOCAL:
+		error = xfs_bmap_add_attrfork_local(tp, ip, &firstblock, &flist,
+			&logflags);
+		break;
+	case XFS_DINODE_FMT_EXTENTS:
+		error = xfs_bmap_add_attrfork_extents(tp, ip, &firstblock,
+			&flist, &logflags);
+		break;
+	case XFS_DINODE_FMT_BTREE:
+		error = xfs_bmap_add_attrfork_btree(tp, ip, &firstblock, &flist,
+			&logflags);
+		break;
+	default:
+		error = 0;
+		break;
+	}
+	if (logflags)
+		xfs_trans_log_inode(tp, ip, logflags);
+	if (error)
+		goto error2;
+	if (!XFS_SB_VERSION_HASATTR(&mp->m_sb)) {
+		s = XFS_SB_LOCK(mp);
+		if (!XFS_SB_VERSION_HASATTR(&mp->m_sb)) {
+			XFS_SB_VERSION_ADDATTR(&mp->m_sb);
+			XFS_SB_UNLOCK(mp, s);
+			xfs_mod_sb(tp, XFS_SB_VERSIONNUM);
+		} else
+			XFS_SB_UNLOCK(mp, s);
+	}
+	if ((error = xfs_bmap_finish(&tp, &flist, firstblock, &committed)))
+		goto error2;
+	error = xfs_trans_commit(tp, XFS_TRANS_PERM_LOG_RES, NULL);
+	ASSERT(ip->i_df.if_ext_max ==
+	       XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
+	return error;
+error2:
+	xfs_bmap_cancel(&flist);
+error1:
+	ASSERT(ismrlocked(&ip->i_lock,MR_UPDATE));
+	xfs_iunlock(ip, XFS_ILOCK_EXCL);
+error0:
+	xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES|XFS_TRANS_ABORT);
+	ASSERT(ip->i_df.if_ext_max ==
+	       XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
+	return error;
+}
+
+/*
+ * Add the extent to the list of extents to be free at transaction end.
+ * The list is maintained sorted (by block number).
+ */
+/* ARGSUSED */
+void
+xfs_bmap_add_free(
+	xfs_fsblock_t		bno,		/* fs block number of extent */
+	xfs_filblks_t		len,		/* length of extent */
+	xfs_bmap_free_t		*flist,		/* list of extents */
+	xfs_mount_t		*mp)		/* mount point structure */
+{
+	xfs_bmap_free_item_t	*cur;		/* current (next) element */
+	xfs_bmap_free_item_t	*new;		/* new element */
+	xfs_bmap_free_item_t	*prev;		/* previous element */
+#ifdef DEBUG
+	xfs_agnumber_t		agno;
+	xfs_agblock_t		agbno;
+
+	ASSERT(bno != NULLFSBLOCK);
+	ASSERT(len > 0);
+	ASSERT(len <= MAXEXTLEN);
+	ASSERT(!ISNULLSTARTBLOCK(bno));
+	agno = XFS_FSB_TO_AGNO(mp, bno);
+	agbno = XFS_FSB_TO_AGBNO(mp, bno);
+	ASSERT(agno < mp->m_sb.sb_agcount);
+	ASSERT(agbno < mp->m_sb.sb_agblocks);
+	ASSERT(len < mp->m_sb.sb_agblocks);
+	ASSERT(agbno + len <= mp->m_sb.sb_agblocks);
+#endif
+	ASSERT(xfs_bmap_free_item_zone != NULL);
+	new = kmem_zone_alloc(xfs_bmap_free_item_zone, KM_SLEEP);
+	new->xbfi_startblock = bno;
+	new->xbfi_blockcount = (xfs_extlen_t)len;
+	for (prev = NULL, cur = flist->xbf_first;
+	     cur != NULL;
+	     prev = cur, cur = cur->xbfi_next) {
+		if (cur->xbfi_startblock >= bno)
+			break;
+	}
+	if (prev)
+		prev->xbfi_next = new;
+	else
+		flist->xbf_first = new;
+	new->xbfi_next = cur;
+	flist->xbf_count++;
+}
+
+/*
+ * Compute and fill in the value of the maximum depth of a bmap btree
+ * in this filesystem.  Done once, during mount.
+ */
+void
+xfs_bmap_compute_maxlevels(
+	xfs_mount_t	*mp,		/* file system mount structure */
+	int		whichfork)	/* data or attr fork */
+{
+	int		level;		/* btree level */
+	uint		maxblocks;	/* max blocks at this level */
+	uint		maxleafents;	/* max leaf entries possible */
+	int		maxrootrecs;	/* max records in root block */
+	int		minleafrecs;	/* min records in leaf block */
+	int		minnoderecs;	/* min records in node block */
+	int		sz;		/* root block size */
+
+	/*
+	 * The maximum number of extents in a file, hence the maximum
+	 * number of leaf entries, is controlled by the type of di_nextents
+	 * (a signed 32-bit number, xfs_extnum_t), or by di_anextents
+	 * (a signed 16-bit number, xfs_aextnum_t).
+	 */
+	maxleafents = (whichfork == XFS_DATA_FORK) ? MAXEXTNUM : MAXAEXTNUM;
+	minleafrecs = mp->m_bmap_dmnr[0];
+	minnoderecs = mp->m_bmap_dmnr[1];
+	sz = (whichfork == XFS_DATA_FORK) ?
+		mp->m_attroffset :
+		mp->m_sb.sb_inodesize - mp->m_attroffset;
+	maxrootrecs = (int)XFS_BTREE_BLOCK_MAXRECS(sz, xfs_bmdr, 0);
+	maxblocks = (maxleafents + minleafrecs - 1) / minleafrecs;
+	for (level = 1; maxblocks > 1; level++) {
+		if (maxblocks <= maxrootrecs)
+			maxblocks = 1;
+		else
+			maxblocks = (maxblocks + minnoderecs - 1) / minnoderecs;
+	}
+	mp->m_bm_maxlevels[whichfork] = level;
+}
+
+/*
+ * Routine to be called at transaction's end by xfs_bmapi, xfs_bunmapi
+ * caller.  Frees all the extents that need freeing, which must be done
+ * last due to locking considerations.  We never free any extents in
+ * the first transaction.  This is to allow the caller to make the first
+ * transaction a synchronous one so that the pointers to the data being
+ * broken in this transaction will be permanent before the data is actually
+ * freed.  This is necessary to prevent blocks from being reallocated
+ * and written to before the free and reallocation are actually permanent.
+ * We do not just make the first transaction synchronous here, because
+ * there are more efficient ways to gain the same protection in some cases
+ * (see the file truncation code).
+ *
+ * Return 1 if the given transaction was committed and a new one
+ * started, and 0 otherwise in the committed parameter.
+ */
+/*ARGSUSED*/
+int						/* error */
+xfs_bmap_finish(
+	xfs_trans_t		**tp,		/* transaction pointer addr */
+	xfs_bmap_free_t		*flist,		/* i/o: list extents to free */
+	xfs_fsblock_t		firstblock,	/* controlled ag for allocs */
+	int			*committed)	/* xact committed or not */
+{
+	xfs_efd_log_item_t	*efd;		/* extent free data */
+	xfs_efi_log_item_t	*efi;		/* extent free intention */
+	int			error;		/* error return value */
+	xfs_bmap_free_item_t	*free;		/* free extent list item */
+	unsigned int		logres;		/* new log reservation */
+	unsigned int		logcount;	/* new log count */
+	xfs_mount_t		*mp;		/* filesystem mount structure */
+	xfs_bmap_free_item_t	*next;		/* next item on free list */
+	xfs_trans_t		*ntp;		/* new transaction pointer */
+
+	ASSERT((*tp)->t_flags & XFS_TRANS_PERM_LOG_RES);
+	if (flist->xbf_count == 0) {
+		*committed = 0;
+		return 0;
+	}
+	ntp = *tp;
+	efi = xfs_trans_get_efi(ntp, flist->xbf_count);
+	for (free = flist->xbf_first; free; free = free->xbfi_next)
+		xfs_trans_log_efi_extent(ntp, efi, free->xbfi_startblock,
+			free->xbfi_blockcount);
+	logres = ntp->t_log_res;
+	logcount = ntp->t_log_count;
+	ntp = xfs_trans_dup(*tp);
+	error = xfs_trans_commit(*tp, 0, NULL);
+	*tp = ntp;
+	*committed = 1;
+	/*
+	 * We have a new transaction, so we should return committed=1,
+	 * even though we're returning an error.
+	 */
+	if (error) {
+		return error;
+	}
+	if ((error = xfs_trans_reserve(ntp, 0, logres, 0, XFS_TRANS_PERM_LOG_RES,
+			logcount)))
+		return error;
+	efd = xfs_trans_get_efd(ntp, efi, flist->xbf_count);
+	for (free = flist->xbf_first; free != NULL; free = next) {
+		next = free->xbfi_next;
+		if ((error = xfs_free_extent(ntp, free->xbfi_startblock,
+				free->xbfi_blockcount))) {
+			/*
+			 * The bmap free list will be cleaned up at a
+			 * higher level.  The EFI will be canceled when
+			 * this transaction is aborted.
+			 * Need to force shutdown here to make sure it
+			 * happens, since this transaction may not be
+			 * dirty yet.
+			 */
+			mp = ntp->t_mountp;
+			if (!XFS_FORCED_SHUTDOWN(mp))
+				xfs_force_shutdown(mp,
+						   (error == EFSCORRUPTED) ?
+						   XFS_CORRUPT_INCORE :
+						   XFS_METADATA_IO_ERROR);
+			return error;
+		}
+		xfs_trans_log_efd_extent(ntp, efd, free->xbfi_startblock,
+			free->xbfi_blockcount);
+		xfs_bmap_del_free(flist, NULL, free);
+	}
+	return 0;
+}
+
+/*
+ * Free up any items left in the list.
+ */
+void
+xfs_bmap_cancel(
+	xfs_bmap_free_t		*flist)	/* list of bmap_free_items */
+{
+	xfs_bmap_free_item_t	*free;	/* free list item */
+	xfs_bmap_free_item_t	*next;
+
+	if (flist->xbf_count == 0)
+		return;
+	ASSERT(flist->xbf_first != NULL);
+	for (free = flist->xbf_first; free; free = next) {
+		next = free->xbfi_next;
+		xfs_bmap_del_free(flist, NULL, free);
+	}
+	ASSERT(flist->xbf_count == 0);
+}
+
+/*
+ * Returns the file-relative block number of the first unused block(s)
+ * in the file with at least "len" logically contiguous blocks free.
+ * This is the lowest-address hole if the file has holes, else the first block
+ * past the end of file.
+ * Return 0 if the file is currently local (in-inode).
+ */
+int						/* error */
+xfs_bmap_first_unused(
+	xfs_trans_t	*tp,			/* transaction pointer */
+	xfs_inode_t	*ip,			/* incore inode */
+	xfs_extlen_t	len,			/* size of hole to find */
+	xfs_fileoff_t	*first_unused,		/* unused block */
+	int		whichfork)		/* data or attr fork */
+{
+	xfs_bmbt_rec_t	*base;			/* base of extent array */
+	xfs_bmbt_rec_t	*ep;			/* pointer to an extent entry */
+	int		error;			/* error return value */
+	xfs_ifork_t	*ifp;			/* inode fork pointer */
+	xfs_fileoff_t	lastaddr;		/* last block number seen */
+	xfs_fileoff_t	lowest;			/* lowest useful block */
+	xfs_fileoff_t	max;			/* starting useful block */
+	xfs_fileoff_t	off;			/* offset for this block */
+	xfs_extnum_t	nextents;		/* number of extent entries */
+
+	ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE ||
+	       XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS ||
+	       XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL);
+	if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
+		*first_unused = 0;
+		return 0;
+	}
+	ifp = XFS_IFORK_PTR(ip, whichfork);
+	if (!(ifp->if_flags & XFS_IFEXTENTS) &&
+	    (error = xfs_iread_extents(tp, ip, whichfork)))
+		return error;
+	lowest = *first_unused;
+	nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
+	base = &ifp->if_u1.if_extents[0];
+	for (lastaddr = 0, max = lowest, ep = base;
+	     ep < &base[nextents];
+	     ep++) {
+		off = xfs_bmbt_get_startoff(ep);
+		/*
+		 * See if the hole before this extent will work.
+		 */
+		if (off >= lowest + len && off - max >= len) {
+			*first_unused = max;
+			return 0;
+		}
+		lastaddr = off + xfs_bmbt_get_blockcount(ep);
+		max = XFS_FILEOFF_MAX(lastaddr, lowest);
+	}
+	*first_unused = max;
+	return 0;
+}
+
+/*
+ * Returns the file-relative block number of the last block + 1 before
+ * last_block (input value) in the file.
+ * This is not based on i_size, it is based on the extent list.
+ * Returns 0 for local files, as they do not have an extent list.
+ */
+int						/* error */
+xfs_bmap_last_before(
+	xfs_trans_t	*tp,			/* transaction pointer */
+	xfs_inode_t	*ip,			/* incore inode */
+	xfs_fileoff_t	*last_block,		/* last block */
+	int		whichfork)		/* data or attr fork */
+{
+	xfs_fileoff_t	bno;			/* input file offset */
+	int		eof;			/* hit end of file */
+	xfs_bmbt_rec_t	*ep;			/* pointer to last extent */
+	int		error;			/* error return value */
+	xfs_bmbt_irec_t	got;			/* current extent value */
+	xfs_ifork_t	*ifp;			/* inode fork pointer */
+	xfs_extnum_t	lastx;			/* last extent used */
+	xfs_bmbt_irec_t	prev;			/* previous extent value */
+
+	if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
+	    XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
+	    XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL)
+	       return XFS_ERROR(EIO);
+	if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
+		*last_block = 0;
+		return 0;
+	}
+	ifp = XFS_IFORK_PTR(ip, whichfork);
+	if (!(ifp->if_flags & XFS_IFEXTENTS) &&
+	    (error = xfs_iread_extents(tp, ip, whichfork)))
+		return error;
+	bno = *last_block - 1;
+	ep = xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
+		&prev);
+	if (eof || xfs_bmbt_get_startoff(ep) > bno) {
+		if (prev.br_startoff == NULLFILEOFF)
+			*last_block = 0;
+		else
+			*last_block = prev.br_startoff + prev.br_blockcount;
+	}
+	/*
+	 * Otherwise *last_block is already the right answer.
+	 */
+	return 0;
+}
+
+/*
+ * Returns the file-relative block number of the first block past eof in
+ * the file.  This is not based on i_size, it is based on the extent list.
+ * Returns 0 for local files, as they do not have an extent list.
+ */
+int						/* error */
+xfs_bmap_last_offset(
+	xfs_trans_t	*tp,			/* transaction pointer */
+	xfs_inode_t	*ip,			/* incore inode */
+	xfs_fileoff_t	*last_block,		/* last block */
+	int		whichfork)		/* data or attr fork */
+{
+	xfs_bmbt_rec_t	*base;			/* base of extent array */
+	xfs_bmbt_rec_t	*ep;			/* pointer to last extent */
+	int		error;			/* error return value */
+	xfs_ifork_t	*ifp;			/* inode fork pointer */
+	xfs_extnum_t	nextents;		/* number of extent entries */
+
+	if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
+	    XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
+	    XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL)
+	       return XFS_ERROR(EIO);
+	if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
+		*last_block = 0;
+		return 0;
+	}
+	ifp = XFS_IFORK_PTR(ip, whichfork);
+	if (!(ifp->if_flags & XFS_IFEXTENTS) &&
+	    (error = xfs_iread_extents(tp, ip, whichfork)))
+		return error;
+	nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
+	if (!nextents) {
+		*last_block = 0;
+		return 0;
+	}
+	base = &ifp->if_u1.if_extents[0];
+	ASSERT(base != NULL);
+	ep = &base[nextents - 1];
+	*last_block = xfs_bmbt_get_startoff(ep) + xfs_bmbt_get_blockcount(ep);
+	return 0;
+}
+
+/*
+ * Returns whether the selected fork of the inode has exactly one
+ * block or not.  For the data fork we check this matches di_size,
+ * implying the file's range is 0..bsize-1.
+ */
+int					/* 1=>1 block, 0=>otherwise */
+xfs_bmap_one_block(
+	xfs_inode_t	*ip,		/* incore inode */
+	int		whichfork)	/* data or attr fork */
+{
+	xfs_bmbt_rec_t	*ep;		/* ptr to fork's extent */
+	xfs_ifork_t	*ifp;		/* inode fork pointer */
+	int		rval;		/* return value */
+	xfs_bmbt_irec_t	s;		/* internal version of extent */
+
+#ifndef DEBUG
+	if (whichfork == XFS_DATA_FORK)
+		return ip->i_d.di_size == ip->i_mount->m_sb.sb_blocksize;
+#endif	/* !DEBUG */
+	if (XFS_IFORK_NEXTENTS(ip, whichfork) != 1)
+		return 0;
+	if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
+		return 0;
+	ifp = XFS_IFORK_PTR(ip, whichfork);
+	ASSERT(ifp->if_flags & XFS_IFEXTENTS);
+	ep = ifp->if_u1.if_extents;
+	xfs_bmbt_get_all(ep, &s);
+	rval = s.br_startoff == 0 && s.br_blockcount == 1;
+	if (rval && whichfork == XFS_DATA_FORK)
+		ASSERT(ip->i_d.di_size == ip->i_mount->m_sb.sb_blocksize);
+	return rval;
+}
+
+/*
+ * Read in the extents to if_extents.
+ * All inode fields are set up by caller, we just traverse the btree
+ * and copy the records in. If the file system cannot contain unwritten
+ * extents, the records are checked for no "state" flags.
+ */
+int					/* error */
+xfs_bmap_read_extents(
+	xfs_trans_t		*tp,	/* transaction pointer */
+	xfs_inode_t		*ip,	/* incore inode */
+	int			whichfork) /* data or attr fork */
+{
+	xfs_bmbt_block_t	*block;	/* current btree block */
+	xfs_fsblock_t		bno;	/* block # of "block" */
+	xfs_buf_t		*bp;	/* buffer for "block" */
+	int			error;	/* error return value */
+	xfs_exntfmt_t		exntf;	/* XFS_EXTFMT_NOSTATE, if checking */
+#ifdef XFS_BMAP_TRACE
+	static char		fname[] = "xfs_bmap_read_extents";
+#endif
+	xfs_extnum_t		i, j;	/* index into the extents list */
+	xfs_ifork_t		*ifp;	/* fork structure */
+	int			level;	/* btree level, for checking */
+	xfs_mount_t		*mp;	/* file system mount structure */
+	xfs_bmbt_ptr_t		*pp;	/* pointer to block address */
+	/* REFERENCED */
+	xfs_extnum_t		room;	/* number of entries there's room for */
+	xfs_bmbt_rec_t		*trp;	/* target record pointer */
+
+	bno = NULLFSBLOCK;
+	mp = ip->i_mount;
+	ifp = XFS_IFORK_PTR(ip, whichfork);
+	exntf = (whichfork != XFS_DATA_FORK) ? XFS_EXTFMT_NOSTATE :
+					XFS_EXTFMT_INODE(ip);
+	block = ifp->if_broot;
+	/*
+	 * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
+	 */
+	ASSERT(INT_GET(block->bb_level, ARCH_CONVERT) > 0);
+	level = INT_GET(block->bb_level, ARCH_CONVERT);
+	pp = XFS_BMAP_BROOT_PTR_ADDR(block, 1, ifp->if_broot_bytes);
+	ASSERT(INT_GET(*pp, ARCH_CONVERT) != NULLDFSBNO);
+	ASSERT(XFS_FSB_TO_AGNO(mp, INT_GET(*pp, ARCH_CONVERT)) < mp->m_sb.sb_agcount);
+	ASSERT(XFS_FSB_TO_AGBNO(mp, INT_GET(*pp, ARCH_CONVERT)) < mp->m_sb.sb_agblocks);
+	bno = INT_GET(*pp, ARCH_CONVERT);
+	/*
+	 * Go down the tree until leaf level is reached, following the first
+	 * pointer (leftmost) at each level.
+	 */
+	while (level-- > 0) {
+		if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
+				XFS_BMAP_BTREE_REF)))
+			return error;
+		block = XFS_BUF_TO_BMBT_BLOCK(bp);
+		XFS_WANT_CORRUPTED_GOTO(
+			XFS_BMAP_SANITY_CHECK(mp, block, level),
+			error0);
+		if (level == 0)
+			break;
+		pp = XFS_BTREE_PTR_ADDR(mp->m_sb.sb_blocksize, xfs_bmbt, block,
+			1, mp->m_bmap_dmxr[1]);
+		XFS_WANT_CORRUPTED_GOTO(
+			XFS_FSB_SANITY_CHECK(mp, INT_GET(*pp, ARCH_CONVERT)),
+			error0);
+		bno = INT_GET(*pp, ARCH_CONVERT);
+		xfs_trans_brelse(tp, bp);
+	}
+	/*
+	 * Here with bp and block set to the leftmost leaf node in the tree.
+	 */
+	room = ifp->if_bytes / (uint)sizeof(*trp);
+	trp = ifp->if_u1.if_extents;
+	i = 0;
+	/*
+	 * Loop over all leaf nodes.  Copy information to the extent list.
+	 */
+	for (;;) {
+		xfs_bmbt_rec_t	*frp, *temp;
+		xfs_fsblock_t	nextbno;
+		xfs_extnum_t	num_recs;
+
+
+		num_recs = INT_GET(block->bb_numrecs, ARCH_CONVERT);
+		if (unlikely(i + num_recs > room)) {
+			ASSERT(i + num_recs <= room);
+			xfs_fs_cmn_err(CE_WARN, ip->i_mount,
+				"corrupt dinode %Lu, (btree extents).  Unmount and run xfs_repair.",
+				(unsigned long long) ip->i_ino);
+			XFS_ERROR_REPORT("xfs_bmap_read_extents(1)",
+					 XFS_ERRLEVEL_LOW,
+					ip->i_mount);
+			goto error0;
+		}
+		XFS_WANT_CORRUPTED_GOTO(
+			XFS_BMAP_SANITY_CHECK(mp, block, 0),
+			error0);
+		/*
+		 * Read-ahead the next leaf block, if any.
+		 */
+		nextbno = INT_GET(block->bb_rightsib, ARCH_CONVERT);
+		if (nextbno != NULLFSBLOCK)
+			xfs_btree_reada_bufl(mp, nextbno, 1);
+		/*
+		 * Copy records into the extent list.
+		 */
+		frp = XFS_BTREE_REC_ADDR(mp->m_sb.sb_blocksize, xfs_bmbt,
+			block, 1, mp->m_bmap_dmxr[0]);
+		temp = trp;
+		for (j = 0; j < num_recs; j++, frp++, trp++) {
+			trp->l0 = INT_GET(frp->l0, ARCH_CONVERT);
+			trp->l1 = INT_GET(frp->l1, ARCH_CONVERT);
+		}
+		if (exntf == XFS_EXTFMT_NOSTATE) {
+			/*
+			 * Check all attribute bmap btree records and
+			 * any "older" data bmap btree records for a
+			 * set bit in the "extent flag" position.
+			 */
+			if (unlikely(xfs_check_nostate_extents(temp, num_recs))) {
+				XFS_ERROR_REPORT("xfs_bmap_read_extents(2)",
+						 XFS_ERRLEVEL_LOW,
+						 ip->i_mount);
+				goto error0;
+			}
+		}
+		i += num_recs;
+		xfs_trans_brelse(tp, bp);
+		bno = nextbno;
+		/*
+		 * If we've reached the end, stop.
+		 */
+		if (bno == NULLFSBLOCK)
+			break;
+		if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
+				XFS_BMAP_BTREE_REF)))
+			return error;
+		block = XFS_BUF_TO_BMBT_BLOCK(bp);
+	}
+	ASSERT(i == ifp->if_bytes / (uint)sizeof(*trp));
+	ASSERT(i == XFS_IFORK_NEXTENTS(ip, whichfork));
+	xfs_bmap_trace_exlist(fname, ip, i, whichfork);
+	return 0;
+error0:
+	xfs_trans_brelse(tp, bp);
+	return XFS_ERROR(EFSCORRUPTED);
+}
+
+#ifdef XFS_BMAP_TRACE
+/*
+ * Add bmap trace insert entries for all the contents of the extent list.
+ */
+void
+xfs_bmap_trace_exlist(
+	char		*fname,		/* function name */
+	xfs_inode_t	*ip,		/* incore inode pointer */
+	xfs_extnum_t	cnt,		/* count of entries in the list */
+	int		whichfork)	/* data or attr fork */
+{
+	xfs_bmbt_rec_t	*base;		/* base of extent list */
+	xfs_bmbt_rec_t	*ep;		/* current entry in extent list */
+	xfs_extnum_t	idx;		/* extent list entry number */
+	xfs_ifork_t	*ifp;		/* inode fork pointer */
+	xfs_bmbt_irec_t	s;		/* extent list record */
+
+	ifp = XFS_IFORK_PTR(ip, whichfork);
+	ASSERT(cnt == ifp->if_bytes / (uint)sizeof(*base));
+	base = ifp->if_u1.if_extents;
+	for (idx = 0, ep = base; idx < cnt; idx++, ep++) {
+		xfs_bmbt_get_all(ep, &s);
+		xfs_bmap_trace_insert(fname, "exlist", ip, idx, 1, &s, NULL,
+			whichfork);
+	}
+}
+#endif
+
+#ifdef DEBUG
+/*
+ * Validate that the bmbt_irecs being returned from bmapi are valid
+ * given the callers original parameters.  Specifically check the
+ * ranges of the returned irecs to ensure that they only extent beyond
+ * the given parameters if the XFS_BMAPI_ENTIRE flag was set.
+ */
+STATIC void
+xfs_bmap_validate_ret(
+	xfs_fileoff_t		bno,
+	xfs_filblks_t		len,
+	int			flags,
+	xfs_bmbt_irec_t		*mval,
+	int			nmap,
+	int			ret_nmap)
+{
+	int			i;		/* index to map values */
+
+	ASSERT(ret_nmap <= nmap);
+
+	for (i = 0; i < ret_nmap; i++) {
+		ASSERT(mval[i].br_blockcount > 0);
+		if (!(flags & XFS_BMAPI_ENTIRE)) {
+			ASSERT(mval[i].br_startoff >= bno);
+			ASSERT(mval[i].br_blockcount <= len);
+			ASSERT(mval[i].br_startoff + mval[i].br_blockcount <=
+			       bno + len);
+		} else {
+			ASSERT(mval[i].br_startoff < bno + len);
+			ASSERT(mval[i].br_startoff + mval[i].br_blockcount >
+			       bno);
+		}
+		ASSERT(i == 0 ||
+		       mval[i - 1].br_startoff + mval[i - 1].br_blockcount ==
+		       mval[i].br_startoff);
+		if ((flags & XFS_BMAPI_WRITE) && !(flags & XFS_BMAPI_DELAY))
+			ASSERT(mval[i].br_startblock != DELAYSTARTBLOCK &&
+			       mval[i].br_startblock != HOLESTARTBLOCK);
+		ASSERT(mval[i].br_state == XFS_EXT_NORM ||
+		       mval[i].br_state == XFS_EXT_UNWRITTEN);
+	}
+}
+#endif /* DEBUG */
+
+
+/*
+ * Map file blocks to filesystem blocks.
+ * File range is given by the bno/len pair.
+ * Adds blocks to file if a write ("flags & XFS_BMAPI_WRITE" set)
+ * into a hole or past eof.
+ * Only allocates blocks from a single allocation group,
+ * to avoid locking problems.
+ * The returned value in "firstblock" from the first call in a transaction
+ * must be remembered and presented to subsequent calls in "firstblock".
+ * An upper bound for the number of blocks to be allocated is supplied to
+ * the first call in "total"; if no allocation group has that many free
+ * blocks then the call will fail (return NULLFSBLOCK in "firstblock").
+ */
+int					/* error */
+xfs_bmapi(
+	xfs_trans_t	*tp,		/* transaction pointer */
+	xfs_inode_t	*ip,		/* incore inode */
+	xfs_fileoff_t	bno,		/* starting file offs. mapped */
+	xfs_filblks_t	len,		/* length to map in file */
+	int		flags,		/* XFS_BMAPI_... */
+	xfs_fsblock_t	*firstblock,	/* first allocated block
+					   controls a.g. for allocs */
+	xfs_extlen_t	total,		/* total blocks needed */
+	xfs_bmbt_irec_t	*mval,		/* output: map values */
+	int		*nmap,		/* i/o: mval size/count */
+	xfs_bmap_free_t	*flist)		/* i/o: list extents to free */
+{
+	xfs_fsblock_t	abno;		/* allocated block number */
+	xfs_extlen_t	alen;		/* allocated extent length */
+	xfs_fileoff_t	aoff;		/* allocated file offset */
+	xfs_bmalloca_t	bma;		/* args for xfs_bmap_alloc */
+	char		contig;		/* allocation must be one extent */
+	xfs_btree_cur_t	*cur;		/* bmap btree cursor */
+	char		delay;		/* this request is for delayed alloc */
+	xfs_fileoff_t	end;		/* end of mapped file region */
+	int		eof;		/* we've hit the end of extent list */
+	xfs_bmbt_rec_t	*ep;		/* extent list entry pointer */
+	int		error;		/* error return */
+	char		exact;		/* don't do all of wasdelayed extent */
+	xfs_bmbt_irec_t	got;		/* current extent list record */
+	xfs_ifork_t	*ifp;		/* inode fork pointer */
+	xfs_extlen_t	indlen;		/* indirect blocks length */
+	char		inhole;		/* current location is hole in file */
+	xfs_extnum_t	lastx;		/* last useful extent number */
+	int		logflags;	/* flags for transaction logging */
+	xfs_extlen_t	minleft;	/* min blocks left after allocation */
+	xfs_extlen_t	minlen;		/* min allocation size */
+	xfs_mount_t	*mp;		/* xfs mount structure */
+	int		n;		/* current extent index */
+	int		nallocs;	/* number of extents alloc\'d */
+	xfs_extnum_t	nextents;	/* number of extents in file */
+	xfs_fileoff_t	obno;		/* old block number (offset) */
+	xfs_bmbt_irec_t	prev;		/* previous extent list record */
+	char		stateless;	/* ignore state flag set */
+	int		tmp_logflags;	/* temp flags holder */
+	char		trim;		/* output trimmed to match range */
+	char		userdata;	/* allocating non-metadata */
+	char		wasdelay;	/* old extent was delayed */
+	int		whichfork;	/* data or attr fork */
+	char		wr;		/* this is a write request */
+	char		rsvd;		/* OK to allocate reserved blocks */
+#ifdef DEBUG
+	xfs_fileoff_t	orig_bno;	/* original block number value */
+	int		orig_flags;	/* original flags arg value */
+	xfs_filblks_t	orig_len;	/* original value of len arg */
+	xfs_bmbt_irec_t	*orig_mval;	/* original value of mval */
+	int		orig_nmap;	/* original value of *nmap */
+
+	orig_bno = bno;
+	orig_len = len;
+	orig_flags = flags;
+	orig_mval = mval;
+	orig_nmap = *nmap;
+#endif
+	ASSERT(*nmap >= 1);
+	ASSERT(*nmap <= XFS_BMAP_MAX_NMAP || !(flags & XFS_BMAPI_WRITE));
+	whichfork = (flags & XFS_BMAPI_ATTRFORK) ?
+		XFS_ATTR_FORK : XFS_DATA_FORK;
+	mp = ip->i_mount;
+	if (unlikely(XFS_TEST_ERROR(
+	    (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
+	     XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
+	     XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_LOCAL),
+	     mp, XFS_ERRTAG_BMAPIFORMAT, XFS_RANDOM_BMAPIFORMAT))) {
+		XFS_ERROR_REPORT("xfs_bmapi", XFS_ERRLEVEL_LOW, mp);
+		return XFS_ERROR(EFSCORRUPTED);
+	}
+	if (XFS_FORCED_SHUTDOWN(mp))
+		return XFS_ERROR(EIO);
+	ifp = XFS_IFORK_PTR(ip, whichfork);
+	ASSERT(ifp->if_ext_max ==
+	       XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
+	if ((wr = (flags & XFS_BMAPI_WRITE)) != 0)
+		XFS_STATS_INC(xs_blk_mapw);
+	else
+		XFS_STATS_INC(xs_blk_mapr);
+	delay = (flags & XFS_BMAPI_DELAY) != 0;
+	trim = (flags & XFS_BMAPI_ENTIRE) == 0;
+	userdata = (flags & XFS_BMAPI_METADATA) == 0;
+	exact = (flags & XFS_BMAPI_EXACT) != 0;
+	rsvd = (flags & XFS_BMAPI_RSVBLOCKS) != 0;
+	contig = (flags & XFS_BMAPI_CONTIG) != 0;
+	/*
+	 * stateless is used to combine extents which
+	 * differ only due to the state of the extents.
+	 * This technique is used from xfs_getbmap()
+	 * when the caller does not wish to see the
+	 * separation (which is the default).
+	 *
+	 * This technique is also used when writing a
+	 * buffer which has been partially written,
+	 * (usually by being flushed during a chunkread),
+	 * to ensure one write takes place. This also
+	 * prevents a change in the xfs inode extents at
+	 * this time, intentionally. This change occurs
+	 * on completion of the write operation, in
+	 * xfs_strat_comp(), where the xfs_bmapi() call
+	 * is transactioned, and the extents combined.
+	 */
+	stateless = (flags & XFS_BMAPI_IGSTATE) != 0;
+	if (stateless && wr)	/* if writing unwritten space, no */
+		wr = 0;		/* allocations are allowed */
+	ASSERT(wr || !delay);
+	logflags = 0;
+	nallocs = 0;
+	cur = NULL;
+	if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_LOCAL) {
+		ASSERT(wr && tp);
+		if ((error = xfs_bmap_local_to_extents(tp, ip,
+				firstblock, total, &logflags, whichfork)))
+			goto error0;
+	}
+	if (wr && *firstblock == NULLFSBLOCK) {
+		if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE)
+			minleft = INT_GET(ifp->if_broot->bb_level, ARCH_CONVERT) + 1;
+		else
+			minleft = 1;
+	} else
+		minleft = 0;
+	if (!(ifp->if_flags & XFS_IFEXTENTS) &&
+	    (error = xfs_iread_extents(tp, ip, whichfork)))
+		goto error0;
+	ep = xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
+		&prev);
+	nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
+	n = 0;
+	end = bno + len;
+	obno = bno;
+	bma.ip = NULL;
+	while (bno < end && n < *nmap) {
+		/*
+		 * Reading past eof, act as though there's a hole
+		 * up to end.
+		 */
+		if (eof && !wr)
+			got.br_startoff = end;
+		inhole = eof || got.br_startoff > bno;
+		wasdelay = wr && !inhole && !delay &&
+			ISNULLSTARTBLOCK(got.br_startblock);
+		/*
+		 * First, deal with the hole before the allocated space
+		 * that we found, if any.
+		 */
+		if (wr && (inhole || wasdelay)) {
+			/*
+			 * For the wasdelay case, we could also just
+			 * allocate the stuff asked for in this bmap call
+			 * but that wouldn't be as good.
+			 */
+			if (wasdelay && !exact) {
+				alen = (xfs_extlen_t)got.br_blockcount;
+				aoff = got.br_startoff;
+				if (lastx != NULLEXTNUM && lastx) {
+					ep = &ifp->if_u1.if_extents[lastx - 1];
+					xfs_bmbt_get_all(ep, &prev);
+				}
+			} else if (wasdelay) {
+				alen = (xfs_extlen_t)
+					XFS_FILBLKS_MIN(len,
+						(got.br_startoff +
+						 got.br_blockcount) - bno);
+				aoff = bno;
+			} else {
+				alen = (xfs_extlen_t)
+					XFS_FILBLKS_MIN(len, MAXEXTLEN);
+				if (!eof)
+					alen = (xfs_extlen_t)
+						XFS_FILBLKS_MIN(alen,
+							got.br_startoff - bno);
+				aoff = bno;
+			}
+			minlen = contig ? alen : 1;
+			if (delay) {
+				indlen = (xfs_extlen_t)
+					xfs_bmap_worst_indlen(ip, alen);
+				ASSERT(indlen > 0);
+				/*
+				 * Make a transaction-less quota reservation for
+				 * delayed allocation blocks. This number gets
+				 * adjusted later.
+				 * We return EDQUOT if we haven't allocated
+				 * blks already inside this loop;
+				 */
+				if (XFS_TRANS_RESERVE_BLKQUOTA(
+						mp, NULL, ip, (long)alen)) {
+					if (n == 0) {
+						*nmap = 0;
+						ASSERT(cur == NULL);
+						return XFS_ERROR(EDQUOT);
+					}
+					break;
+				}
+
+				/*
+				 * Split changing sb for alen and indlen since
+				 * they could be coming from different places.
+				 */
+				if (ip->i_d.di_flags & XFS_DIFLAG_REALTIME) {
+					xfs_extlen_t	extsz;
+					xfs_extlen_t	ralen;
+					if (!(extsz = ip->i_d.di_extsize))
+						extsz = mp->m_sb.sb_rextsize;
+					ralen = roundup(alen, extsz);
+					ralen = ralen / mp->m_sb.sb_rextsize;
+					if (xfs_mod_incore_sb(mp,
+						XFS_SBS_FREXTENTS,
+						-(ralen), rsvd)) {
+						if (XFS_IS_QUOTA_ON(ip->i_mount))
+							XFS_TRANS_UNRESERVE_BLKQUOTA(
+						     		mp, NULL, ip,
+								(long)alen);
+						break;
+					}
+				} else {
+					if (xfs_mod_incore_sb(mp,
+							      XFS_SBS_FDBLOCKS,
+							      -(alen), rsvd)) {
+						if (XFS_IS_QUOTA_ON(ip->i_mount))
+							XFS_TRANS_UNRESERVE_BLKQUOTA(
+								mp, NULL, ip,
+								(long)alen);
+						break;
+					}
+				}
+
+				if (xfs_mod_incore_sb(mp, XFS_SBS_FDBLOCKS,
+						-(indlen), rsvd)) {
+					XFS_TRANS_UNRESERVE_BLKQUOTA(
+						mp, NULL, ip, (long)alen);
+					break;
+				}
+				ip->i_delayed_blks += alen;
+				abno = NULLSTARTBLOCK(indlen);
+			} else {
+				/*
+				 * If first time, allocate and fill in
+				 * once-only bma fields.
+				 */
+				if (bma.ip == NULL) {
+					bma.tp = tp;
+					bma.ip = ip;
+					bma.prevp = &prev;
+					bma.gotp = &got;
+					bma.total = total;
+					bma.userdata = 0;
+				}
+				/* Indicate if this is the first user data
+				 * in the file, or just any user data.
+				 */
+				if (userdata) {
+					bma.userdata = (aoff == 0) ?
+						XFS_ALLOC_INITIAL_USER_DATA :
+						XFS_ALLOC_USERDATA;
+				}
+				/*
+				 * Fill in changeable bma fields.
+				 */
+				bma.eof = eof;
+				bma.firstblock = *firstblock;
+				bma.alen = alen;
+				bma.off = aoff;
+				bma.wasdel = wasdelay;
+				bma.minlen = minlen;
+				bma.low = flist->xbf_low;
+				bma.minleft = minleft;
+				/*
+				 * Only want to do the alignment at the
+				 * eof if it is userdata and allocation length
+				 * is larger than a stripe unit.
+				 */
+				if (mp->m_dalign && alen >= mp->m_dalign &&
+				    userdata && whichfork == XFS_DATA_FORK) {
+					if ((error = xfs_bmap_isaeof(ip, aoff,
+							whichfork, &bma.aeof)))
+						goto error0;
+				} else
+					bma.aeof = 0;
+				/*
+				 * Call allocator.
+				 */
+				if ((error = xfs_bmap_alloc(&bma)))
+					goto error0;
+				/*
+				 * Copy out result fields.
+				 */
+				abno = bma.rval;
+				if ((flist->xbf_low = bma.low))
+					minleft = 0;
+				alen = bma.alen;
+				aoff = bma.off;
+				ASSERT(*firstblock == NULLFSBLOCK ||
+				       XFS_FSB_TO_AGNO(mp, *firstblock) ==
+				       XFS_FSB_TO_AGNO(mp, bma.firstblock) ||
+				       (flist->xbf_low &&
+					XFS_FSB_TO_AGNO(mp, *firstblock) <
+					XFS_FSB_TO_AGNO(mp, bma.firstblock)));
+				*firstblock = bma.firstblock;
+				if (cur)
+					cur->bc_private.b.firstblock =
+						*firstblock;
+				if (abno == NULLFSBLOCK)
+					break;
+				if ((ifp->if_flags & XFS_IFBROOT) && !cur) {
+					cur = xfs_btree_init_cursor(mp,
+						tp, NULL, 0, XFS_BTNUM_BMAP,
+						ip, whichfork);
+					cur->bc_private.b.firstblock =
+						*firstblock;
+					cur->bc_private.b.flist = flist;
+				}
+				/*
+				 * Bump the number of extents we've allocated
+				 * in this call.
+				 */
+				nallocs++;
+			}
+			if (cur)
+				cur->bc_private.b.flags =
+					wasdelay ? XFS_BTCUR_BPRV_WASDEL : 0;
+			got.br_startoff = aoff;
+			got.br_startblock = abno;
+			got.br_blockcount = alen;
+			got.br_state = XFS_EXT_NORM;	/* assume normal */
+			/*
+			 * Determine state of extent, and the filesystem.
+			 * A wasdelay extent has been initialized, so
+			 * shouldn't be flagged as unwritten.
+			 */
+			if (wr && XFS_SB_VERSION_HASEXTFLGBIT(&mp->m_sb)) {
+				if (!wasdelay && (flags & XFS_BMAPI_PREALLOC))
+					got.br_state = XFS_EXT_UNWRITTEN;
+			}
+			error = xfs_bmap_add_extent(ip, lastx, &cur, &got,
+				firstblock, flist, &tmp_logflags, whichfork,
+				rsvd);
+			logflags |= tmp_logflags;
+			if (error)
+				goto error0;
+			lastx = ifp->if_lastex;
+			ep = &ifp->if_u1.if_extents[lastx];
+			nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
+			xfs_bmbt_get_all(ep, &got);
+			ASSERT(got.br_startoff <= aoff);
+			ASSERT(got.br_startoff + got.br_blockcount >=
+				aoff + alen);
+#ifdef DEBUG
+			if (delay) {
+				ASSERT(ISNULLSTARTBLOCK(got.br_startblock));
+				ASSERT(STARTBLOCKVAL(got.br_startblock) > 0);
+			}
+			ASSERT(got.br_state == XFS_EXT_NORM ||
+			       got.br_state == XFS_EXT_UNWRITTEN);
+#endif
+			/*
+			 * Fall down into the found allocated space case.
+			 */
+		} else if (inhole) {
+			/*
+			 * Reading in a hole.
+			 */
+			mval->br_startoff = bno;
+			mval->br_startblock = HOLESTARTBLOCK;
+			mval->br_blockcount =
+				XFS_FILBLKS_MIN(len, got.br_startoff - bno);
+			mval->br_state = XFS_EXT_NORM;
+			bno += mval->br_blockcount;
+			len -= mval->br_blockcount;
+			mval++;
+			n++;
+			continue;
+		}
+		/*
+		 * Then deal with the allocated space we found.
+		 */
+		ASSERT(ep != NULL);
+		if (trim && (got.br_startoff + got.br_blockcount > obno)) {
+			if (obno > bno)
+				bno = obno;
+			ASSERT((bno >= obno) || (n == 0));
+			ASSERT(bno < end);
+			mval->br_startoff = bno;
+			if (ISNULLSTARTBLOCK(got.br_startblock)) {
+				ASSERT(!wr || delay);
+				mval->br_startblock = DELAYSTARTBLOCK;
+			} else
+				mval->br_startblock =
+					got.br_startblock +
+					(bno - got.br_startoff);
+			/*
+			 * Return the minimum of what we got and what we
+			 * asked for for the length.  We can use the len
+			 * variable here because it is modified below
+			 * and we could have been there before coming
+			 * here if the first part of the allocation
+			 * didn't overlap what was asked for.
+			 */
+			mval->br_blockcount =
+				XFS_FILBLKS_MIN(end - bno, got.br_blockcount -
+					(bno - got.br_startoff));
+			mval->br_state = got.br_state;
+			ASSERT(mval->br_blockcount <= len);
+		} else {
+			*mval = got;
+			if (ISNULLSTARTBLOCK(mval->br_startblock)) {
+				ASSERT(!wr || delay);
+				mval->br_startblock = DELAYSTARTBLOCK;
+			}
+		}
+
+		/*
+		 * Check if writing previously allocated but
+		 * unwritten extents.
+		 */
+		if (wr && mval->br_state == XFS_EXT_UNWRITTEN &&
+		    ((flags & (XFS_BMAPI_PREALLOC|XFS_BMAPI_DELAY)) == 0)) {
+			/*
+			 * Modify (by adding) the state flag, if writing.
+			 */
+			ASSERT(mval->br_blockcount <= len);
+			if ((ifp->if_flags & XFS_IFBROOT) && !cur) {
+				cur = xfs_btree_init_cursor(mp,
+					tp, NULL, 0, XFS_BTNUM_BMAP,
+					ip, whichfork);
+				cur->bc_private.b.firstblock =
+					*firstblock;
+				cur->bc_private.b.flist = flist;
+			}
+			mval->br_state = XFS_EXT_NORM;
+			error = xfs_bmap_add_extent(ip, lastx, &cur, mval,
+				firstblock, flist, &tmp_logflags, whichfork,
+				rsvd);
+			logflags |= tmp_logflags;
+			if (error)
+				goto error0;
+			lastx = ifp->if_lastex;
+			ep = &ifp->if_u1.if_extents[lastx];
+			nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
+			xfs_bmbt_get_all(ep, &got);
+			/*
+			 * We may have combined previously unwritten
+			 * space with written space, so generate
+			 * another request.
+			 */
+			if (mval->br_blockcount < len)
+				continue;
+		}
+
+		ASSERT(!trim ||
+		       ((mval->br_startoff + mval->br_blockcount) <= end));
+		ASSERT(!trim || (mval->br_blockcount <= len) ||
+		       (mval->br_startoff < obno));
+		bno = mval->br_startoff + mval->br_blockcount;
+		len = end - bno;
+		if (n > 0 && mval->br_startoff == mval[-1].br_startoff) {
+			ASSERT(mval->br_startblock == mval[-1].br_startblock);
+			ASSERT(mval->br_blockcount > mval[-1].br_blockcount);
+			ASSERT(mval->br_state == mval[-1].br_state);
+			mval[-1].br_blockcount = mval->br_blockcount;
+			mval[-1].br_state = mval->br_state;
+		} else if (n > 0 && mval->br_startblock != DELAYSTARTBLOCK &&
+			   mval[-1].br_startblock != DELAYSTARTBLOCK &&
+			   mval[-1].br_startblock != HOLESTARTBLOCK &&
+			   mval->br_startblock ==
+			   mval[-1].br_startblock + mval[-1].br_blockcount &&
+			   (stateless || mval[-1].br_state == mval->br_state)) {
+			ASSERT(mval->br_startoff ==
+			       mval[-1].br_startoff + mval[-1].br_blockcount);
+			mval[-1].br_blockcount += mval->br_blockcount;
+		} else if (n > 0 &&
+			   mval->br_startblock == DELAYSTARTBLOCK &&
+			   mval[-1].br_startblock == DELAYSTARTBLOCK &&
+			   mval->br_startoff ==
+			   mval[-1].br_startoff + mval[-1].br_blockcount) {
+			mval[-1].br_blockcount += mval->br_blockcount;
+			mval[-1].br_state = mval->br_state;
+		} else if (!((n == 0) &&
+			     ((mval->br_startoff + mval->br_blockcount) <=
+			      obno))) {
+			mval++;
+			n++;
+		}
+		/*
+		 * If we're done, stop now.  Stop when we've allocated
+		 * XFS_BMAP_MAX_NMAP extents no matter what.  Otherwise
+		 * the transaction may get too big.
+		 */
+		if (bno >= end || n >= *nmap || nallocs >= *nmap)
+			break;
+		/*
+		 * Else go on to the next record.
+		 */
+		ep++;
+		lastx++;
+		if (lastx >= nextents) {
+			eof = 1;
+			prev = got;
+		} else
+			xfs_bmbt_get_all(ep, &got);
+	}
+	ifp->if_lastex = lastx;
+	*nmap = n;
+	/*
+	 * Transform from btree to extents, give it cur.
+	 */
+	if (tp && XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE &&
+	    XFS_IFORK_NEXTENTS(ip, whichfork) <= ifp->if_ext_max) {
+		ASSERT(wr && cur);
+		error = xfs_bmap_btree_to_extents(tp, ip, cur,
+			&tmp_logflags, whichfork);
+		logflags |= tmp_logflags;
+		if (error)
+			goto error0;
+	}
+	ASSERT(ifp->if_ext_max ==
+	       XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
+	ASSERT(XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE ||
+	       XFS_IFORK_NEXTENTS(ip, whichfork) > ifp->if_ext_max);
+	error = 0;
+
+error0:
+	/*
+	 * Log everything.  Do this after conversion, there's no point in
+	 * logging the extent list if we've converted to btree format.
+	 */
+	if ((logflags & XFS_ILOG_FEXT(whichfork)) &&
+	    XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
+		logflags &= ~XFS_ILOG_FEXT(whichfork);
+	else if ((logflags & XFS_ILOG_FBROOT(whichfork)) &&
+		 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)
+		logflags &= ~XFS_ILOG_FBROOT(whichfork);
+	/*
+	 * Log whatever the flags say, even if error.  Otherwise we might miss
+	 * detecting a case where the data is changed, there's an error,
+	 * and it's not logged so we don't shutdown when we should.
+	 */
+	if (logflags) {
+		ASSERT(tp && wr);
+		xfs_trans_log_inode(tp, ip, logflags);
+	}
+	if (cur) {
+		if (!error) {
+			ASSERT(*firstblock == NULLFSBLOCK ||
+			       XFS_FSB_TO_AGNO(mp, *firstblock) ==
+			       XFS_FSB_TO_AGNO(mp,
+				       cur->bc_private.b.firstblock) ||
+			       (flist->xbf_low &&
+				XFS_FSB_TO_AGNO(mp, *firstblock) <
+				XFS_FSB_TO_AGNO(mp,
+					cur->bc_private.b.firstblock)));
+			*firstblock = cur->bc_private.b.firstblock;
+		}
+		xfs_btree_del_cursor(cur,
+			error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
+	}
+	if (!error)
+		xfs_bmap_validate_ret(orig_bno, orig_len, orig_flags, orig_mval,
+			orig_nmap, *nmap);
+	return error;
+}
+
+/*
+ * Map file blocks to filesystem blocks, simple version.
+ * One block (extent) only, read-only.
+ * For flags, only the XFS_BMAPI_ATTRFORK flag is examined.
+ * For the other flag values, the effect is as if XFS_BMAPI_METADATA
+ * was set and all the others were clear.
+ */
+int						/* error */
+xfs_bmapi_single(
+	xfs_trans_t	*tp,		/* transaction pointer */
+	xfs_inode_t	*ip,		/* incore inode */
+	int		whichfork,	/* data or attr fork */
+	xfs_fsblock_t	*fsb,		/* output: mapped block */
+	xfs_fileoff_t	bno)		/* starting file offs. mapped */
+{
+	int		eof;		/* we've hit the end of extent list */
+	int		error;		/* error return */
+	xfs_bmbt_irec_t	got;		/* current extent list record */
+	xfs_ifork_t	*ifp;		/* inode fork pointer */
+	xfs_extnum_t	lastx;		/* last useful extent number */
+	xfs_bmbt_irec_t	prev;		/* previous extent list record */
+
+	ifp = XFS_IFORK_PTR(ip, whichfork);
+	if (unlikely(
+	    XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE &&
+	    XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)) {
+	       XFS_ERROR_REPORT("xfs_bmapi_single", XFS_ERRLEVEL_LOW,
+				ip->i_mount);
+	       return XFS_ERROR(EFSCORRUPTED);
+	}
+	if (XFS_FORCED_SHUTDOWN(ip->i_mount))
+		return XFS_ERROR(EIO);
+	XFS_STATS_INC(xs_blk_mapr);
+	if (!(ifp->if_flags & XFS_IFEXTENTS) &&
+	    (error = xfs_iread_extents(tp, ip, whichfork)))
+		return error;
+	(void)xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
+		&prev);
+	/*
+	 * Reading past eof, act as though there's a hole
+	 * up to end.
+	 */
+	if (eof || got.br_startoff > bno) {
+		*fsb = NULLFSBLOCK;
+		return 0;
+	}
+	ASSERT(!ISNULLSTARTBLOCK(got.br_startblock));
+	ASSERT(bno < got.br_startoff + got.br_blockcount);
+	*fsb = got.br_startblock + (bno - got.br_startoff);
+	ifp->if_lastex = lastx;
+	return 0;
+}
+
+/*
+ * Unmap (remove) blocks from a file.
+ * If nexts is nonzero then the number of extents to remove is limited to
+ * that value.  If not all extents in the block range can be removed then
+ * *done is set.
+ */
+int						/* error */
+xfs_bunmapi(
+	xfs_trans_t		*tp,		/* transaction pointer */
+	struct xfs_inode	*ip,		/* incore inode */
+	xfs_fileoff_t		bno,		/* starting offset to unmap */
+	xfs_filblks_t		len,		/* length to unmap in file */
+	int			flags,		/* misc flags */
+	xfs_extnum_t		nexts,		/* number of extents max */
+	xfs_fsblock_t		*firstblock,	/* first allocated block
+						   controls a.g. for allocs */
+	xfs_bmap_free_t		*flist,		/* i/o: list extents to free */
+	int			*done)		/* set if not done yet */
+{
+	xfs_btree_cur_t		*cur;		/* bmap btree cursor */
+	xfs_bmbt_irec_t		del;		/* extent being deleted */
+	int			eof;		/* is deleting at eof */
+	xfs_bmbt_rec_t		*ep;		/* extent list entry pointer */
+	int			error;		/* error return value */
+	xfs_extnum_t		extno;		/* extent number in list */
+	xfs_bmbt_irec_t		got;		/* current extent list entry */
+	xfs_ifork_t		*ifp;		/* inode fork pointer */
+	int			isrt;		/* freeing in rt area */
+	xfs_extnum_t		lastx;		/* last extent index used */
+	int			logflags;	/* transaction logging flags */
+	xfs_extlen_t		mod;		/* rt extent offset */
+	xfs_mount_t		*mp;		/* mount structure */
+	xfs_extnum_t		nextents;	/* size of extent list */
+	xfs_bmbt_irec_t		prev;		/* previous extent list entry */
+	xfs_fileoff_t		start;		/* first file offset deleted */
+	int			tmp_logflags;	/* partial logging flags */
+	int			wasdel;		/* was a delayed alloc extent */
+	int			whichfork;	/* data or attribute fork */
+	int			rsvd;		/* OK to allocate reserved blocks */
+	xfs_fsblock_t		sum;
+
+	xfs_bunmap_trace(ip, bno, len, flags, (inst_t *)__return_address);
+	whichfork = (flags & XFS_BMAPI_ATTRFORK) ?
+		XFS_ATTR_FORK : XFS_DATA_FORK;
+	ifp = XFS_IFORK_PTR(ip, whichfork);
+	if (unlikely(
+	    XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS &&
+	    XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)) {
+		XFS_ERROR_REPORT("xfs_bunmapi", XFS_ERRLEVEL_LOW,
+				 ip->i_mount);
+		return XFS_ERROR(EFSCORRUPTED);
+	}
+	mp = ip->i_mount;
+	if (XFS_FORCED_SHUTDOWN(mp))
+		return XFS_ERROR(EIO);
+	rsvd = (flags & XFS_BMAPI_RSVBLOCKS) != 0;
+	ASSERT(len > 0);
+	ASSERT(nexts >= 0);
+	ASSERT(ifp->if_ext_max ==
+	       XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
+	if (!(ifp->if_flags & XFS_IFEXTENTS) &&
+	    (error = xfs_iread_extents(tp, ip, whichfork)))
+		return error;
+	nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
+	if (nextents == 0) {
+		*done = 1;
+		return 0;
+	}
+	XFS_STATS_INC(xs_blk_unmap);
+	isrt = (whichfork == XFS_DATA_FORK) &&
+	       (ip->i_d.di_flags & XFS_DIFLAG_REALTIME);
+	start = bno;
+	bno = start + len - 1;
+	ep = xfs_bmap_search_extents(ip, bno, whichfork, &eof, &lastx, &got,
+		&prev);
+	/*
+	 * Check to see if the given block number is past the end of the
+	 * file, back up to the last block if so...
+	 */
+	if (eof) {
+		ep = &ifp->if_u1.if_extents[--lastx];
+		xfs_bmbt_get_all(ep, &got);
+		bno = got.br_startoff + got.br_blockcount - 1;
+	}
+	logflags = 0;
+	if (ifp->if_flags & XFS_IFBROOT) {
+		ASSERT(XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE);
+		cur = xfs_btree_init_cursor(mp, tp, NULL, 0, XFS_BTNUM_BMAP, ip,
+			whichfork);
+		cur->bc_private.b.firstblock = *firstblock;
+		cur->bc_private.b.flist = flist;
+		cur->bc_private.b.flags = 0;
+	} else
+		cur = NULL;
+	extno = 0;
+	while (bno != (xfs_fileoff_t)-1 && bno >= start && lastx >= 0 &&
+	       (nexts == 0 || extno < nexts)) {
+		/*
+		 * Is the found extent after a hole in which bno lives?
+		 * Just back up to the previous extent, if so.
+		 */
+		if (got.br_startoff > bno) {
+			if (--lastx < 0)
+				break;
+			ep--;
+			xfs_bmbt_get_all(ep, &got);
+		}
+		/*
+		 * Is the last block of this extent before the range
+		 * we're supposed to delete?  If so, we're done.
+		 */
+		bno = XFS_FILEOFF_MIN(bno,
+			got.br_startoff + got.br_blockcount - 1);
+		if (bno < start)
+			break;
+		/*
+		 * Then deal with the (possibly delayed) allocated space
+		 * we found.
+		 */
+		ASSERT(ep != NULL);
+		del = got;
+		wasdel = ISNULLSTARTBLOCK(del.br_startblock);
+		if (got.br_startoff < start) {
+			del.br_startoff = start;
+			del.br_blockcount -= start - got.br_startoff;
+			if (!wasdel)
+				del.br_startblock += start - got.br_startoff;
+		}
+		if (del.br_startoff + del.br_blockcount > bno + 1)
+			del.br_blockcount = bno + 1 - del.br_startoff;
+		sum = del.br_startblock + del.br_blockcount;
+		if (isrt &&
+		    (mod = do_mod(sum, mp->m_sb.sb_rextsize))) {
+			/*
+			 * Realtime extent not lined up at the end.
+			 * The extent could have been split into written
+			 * and unwritten pieces, or we could just be
+			 * unmapping part of it.  But we can't really
+			 * get rid of part of a realtime extent.
+			 */
+			if (del.br_state == XFS_EXT_UNWRITTEN ||
+			    !XFS_SB_VERSION_HASEXTFLGBIT(&mp->m_sb)) {
+				/*
+				 * This piece is unwritten, or we're not
+				 * using unwritten extents.  Skip over it.
+				 */
+				ASSERT(bno >= mod);
+				bno -= mod > del.br_blockcount ?
+					del.br_blockcount : mod;
+				if (bno < got.br_startoff) {
+					if (--lastx >= 0)
+						xfs_bmbt_get_all(--ep, &got);
+				}
+				continue;
+			}
+			/*
+			 * It's written, turn it unwritten.
+			 * This is better than zeroing it.
+			 */
+			ASSERT(del.br_state == XFS_EXT_NORM);
+			ASSERT(xfs_trans_get_block_res(tp) > 0);
+			/*
+			 * If this spans a realtime extent boundary,
+			 * chop it back to the start of the one we end at.
+			 */
+			if (del.br_blockcount > mod) {
+				del.br_startoff += del.br_blockcount - mod;
+				del.br_startblock += del.br_blockcount - mod;
+				del.br_blockcount = mod;
+			}
+			del.br_state = XFS_EXT_UNWRITTEN;
+			error = xfs_bmap_add_extent(ip, lastx, &cur, &del,
+				firstblock, flist, &logflags, XFS_DATA_FORK, 0);
+			if (error)
+				goto error0;
+			goto nodelete;
+		}
+		if (isrt && (mod = do_mod(del.br_startblock, mp->m_sb.sb_rextsize))) {
+			/*
+			 * Realtime extent is lined up at the end but not
+			 * at the front.  We'll get rid of full extents if
+			 * we can.
+			 */
+			mod = mp->m_sb.sb_rextsize - mod;
+			if (del.br_blockcount > mod) {
+				del.br_blockcount -= mod;
+				del.br_startoff += mod;
+				del.br_startblock += mod;
+			} else if ((del.br_startoff == start &&
+				    (del.br_state == XFS_EXT_UNWRITTEN ||
+				     xfs_trans_get_block_res(tp) == 0)) ||
+				   !XFS_SB_VERSION_HASEXTFLGBIT(&mp->m_sb)) {
+				/*
+				 * Can't make it unwritten.  There isn't
+				 * a full extent here so just skip it.
+				 */
+				ASSERT(bno >= del.br_blockcount);
+				bno -= del.br_blockcount;
+				if (bno < got.br_startoff) {
+					if (--lastx >= 0)
+						xfs_bmbt_get_all(--ep, &got);
+				}
+				continue;
+			} else if (del.br_state == XFS_EXT_UNWRITTEN) {
+				/*
+				 * This one is already unwritten.
+				 * It must have a written left neighbor.
+				 * Unwrite the killed part of that one and
+				 * try again.
+				 */
+				ASSERT(lastx > 0);
+				xfs_bmbt_get_all(ep - 1, &prev);
+				ASSERT(prev.br_state == XFS_EXT_NORM);
+				ASSERT(!ISNULLSTARTBLOCK(prev.br_startblock));
+				ASSERT(del.br_startblock ==
+				       prev.br_startblock + prev.br_blockcount);
+				if (prev.br_startoff < start) {
+					mod = start - prev.br_startoff;
+					prev.br_blockcount -= mod;
+					prev.br_startblock += mod;
+					prev.br_startoff = start;
+				}
+				prev.br_state = XFS_EXT_UNWRITTEN;
+				error = xfs_bmap_add_extent(ip, lastx - 1, &cur,
+					&prev, firstblock, flist, &logflags,
+					XFS_DATA_FORK, 0);
+				if (error)
+					goto error0;
+				goto nodelete;
+			} else {
+				ASSERT(del.br_state == XFS_EXT_NORM);
+				del.br_state = XFS_EXT_UNWRITTEN;
+				error = xfs_bmap_add_extent(ip, lastx, &cur,
+					&del, firstblock, flist, &logflags,
+					XFS_DATA_FORK, 0);
+				if (error)
+					goto error0;
+				goto nodelete;
+			}
+		}
+		if (wasdel) {
+			ASSERT(STARTBLOCKVAL(del.br_startblock) > 0);
+			xfs_mod_incore_sb(mp, XFS_SBS_FDBLOCKS,
+				(int)del.br_blockcount, rsvd);
+			/* Unreserve our quota space */
+			XFS_TRANS_RESERVE_QUOTA_NBLKS(
+				mp, NULL, ip, -((long)del.br_blockcount), 0,
+				isrt ?	XFS_QMOPT_RES_RTBLKS :
+					XFS_QMOPT_RES_REGBLKS);
+			ip->i_delayed_blks -= del.br_blockcount;
+			if (cur)
+				cur->bc_private.b.flags |=
+					XFS_BTCUR_BPRV_WASDEL;
+		} else if (cur)
+			cur->bc_private.b.flags &= ~XFS_BTCUR_BPRV_WASDEL;
+		/*
+		 * If it's the case where the directory code is running
+		 * with no block reservation, and the deleted block is in
+		 * the middle of its extent, and the resulting insert
+		 * of an extent would cause transformation to btree format,
+		 * then reject it.  The calling code will then swap
+		 * blocks around instead.
+		 * We have to do this now, rather than waiting for the
+		 * conversion to btree format, since the transaction
+		 * will be dirty.
+		 */
+		if (!wasdel && xfs_trans_get_block_res(tp) == 0 &&
+		    XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
+		    XFS_IFORK_NEXTENTS(ip, whichfork) >= ifp->if_ext_max &&
+		    del.br_startoff > got.br_startoff &&
+		    del.br_startoff + del.br_blockcount <
+		    got.br_startoff + got.br_blockcount) {
+			error = XFS_ERROR(ENOSPC);
+			goto error0;
+		}
+		error = xfs_bmap_del_extent(ip, tp, lastx, flist, cur, &del,
+			&tmp_logflags, whichfork, rsvd);
+		logflags |= tmp_logflags;
+		if (error)
+			goto error0;
+		bno = del.br_startoff - 1;
+nodelete:
+		lastx = ifp->if_lastex;
+		/*
+		 * If not done go on to the next (previous) record.
+		 * Reset ep in case the extents array was re-alloced.
+		 */
+		ep = &ifp->if_u1.if_extents[lastx];
+		if (bno != (xfs_fileoff_t)-1 && bno >= start) {
+			if (lastx >= XFS_IFORK_NEXTENTS(ip, whichfork) ||
+			    xfs_bmbt_get_startoff(ep) > bno) {
+				lastx--;
+				ep--;
+			}
+			if (lastx >= 0)
+				xfs_bmbt_get_all(ep, &got);
+			extno++;
+		}
+	}
+	ifp->if_lastex = lastx;
+	*done = bno == (xfs_fileoff_t)-1 || bno < start || lastx < 0;
+	ASSERT(ifp->if_ext_max ==
+	       XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
+	/*
+	 * Convert to a btree if necessary.
+	 */
+	if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS &&
+	    XFS_IFORK_NEXTENTS(ip, whichfork) > ifp->if_ext_max) {
+		ASSERT(cur == NULL);
+		error = xfs_bmap_extents_to_btree(tp, ip, firstblock, flist,
+			&cur, 0, &tmp_logflags, whichfork);
+		logflags |= tmp_logflags;
+		if (error)
+			goto error0;
+	}
+	/*
+	 * transform from btree to extents, give it cur
+	 */
+	else if (XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_BTREE &&
+		 XFS_IFORK_NEXTENTS(ip, whichfork) <= ifp->if_ext_max) {
+		ASSERT(cur != NULL);
+		error = xfs_bmap_btree_to_extents(tp, ip, cur, &tmp_logflags,
+			whichfork);
+		logflags |= tmp_logflags;
+		if (error)
+			goto error0;
+	}
+	/*
+	 * transform from extents to local?
+	 */
+	ASSERT(ifp->if_ext_max ==
+	       XFS_IFORK_SIZE(ip, whichfork) / (uint)sizeof(xfs_bmbt_rec_t));
+	error = 0;
+error0:
+	/*
+	 * Log everything.  Do this after conversion, there's no point in
+	 * logging the extent list if we've converted to btree format.
+	 */
+	if ((logflags & XFS_ILOG_FEXT(whichfork)) &&
+	    XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_EXTENTS)
+		logflags &= ~XFS_ILOG_FEXT(whichfork);
+	else if ((logflags & XFS_ILOG_FBROOT(whichfork)) &&
+		 XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE)
+		logflags &= ~XFS_ILOG_FBROOT(whichfork);
+	/*
+	 * Log inode even in the error case, if the transaction
+	 * is dirty we'll need to shut down the filesystem.
+	 */
+	if (logflags)
+		xfs_trans_log_inode(tp, ip, logflags);
+	if (cur) {
+		if (!error) {
+			*firstblock = cur->bc_private.b.firstblock;
+			cur->bc_private.b.allocated = 0;
+		}
+		xfs_btree_del_cursor(cur,
+			error ? XFS_BTREE_ERROR : XFS_BTREE_NOERROR);
+	}
+	return error;
+}
+
+/*
+ * Fcntl interface to xfs_bmapi.
+ */
+int						/* error code */
+xfs_getbmap(
+	bhv_desc_t		*bdp,		/* XFS behavior descriptor*/
+	struct getbmap		*bmv,		/* user bmap structure */
+	void			__user *ap,	/* pointer to user's array */
+	int			interface)	/* interface flags */
+{
+	__int64_t		bmvend;		/* last block requested */
+	int			error;		/* return value */
+	__int64_t		fixlen;		/* length for -1 case */
+	int			i;		/* extent number */
+	xfs_inode_t		*ip;		/* xfs incore inode pointer */
+	vnode_t			*vp;		/* corresponding vnode */
+	int			lock;		/* lock state */
+	xfs_bmbt_irec_t		*map;		/* buffer for user's data */
+	xfs_mount_t		*mp;		/* file system mount point */
+	int			nex;		/* # of user extents can do */
+	int			nexleft;	/* # of user extents left */
+	int			subnex;		/* # of bmapi's can do */
+	int			nmap;		/* number of map entries */
+	struct getbmap		out;		/* output structure */
+	int			whichfork;	/* data or attr fork */
+	int			prealloced;	/* this is a file with
+						 * preallocated data space */
+	int			sh_unwritten;	/* true, if unwritten */
+						/* extents listed separately */
+	int			bmapi_flags;	/* flags for xfs_bmapi */
+	__int32_t		oflags;		/* getbmapx bmv_oflags field */
+
+	vp = BHV_TO_VNODE(bdp);
+	ip = XFS_BHVTOI(bdp);
+	mp = ip->i_mount;
+
+	whichfork = interface & BMV_IF_ATTRFORK ? XFS_ATTR_FORK : XFS_DATA_FORK;
+	sh_unwritten = (interface & BMV_IF_PREALLOC) != 0;
+
+	/*	If the BMV_IF_NO_DMAPI_READ interface bit specified, do not
+	 *	generate a DMAPI read event.  Otherwise, if the DM_EVENT_READ
+	 *	bit is set for the file, generate a read event in order
+	 *	that the DMAPI application may do its thing before we return
+	 *	the extents.  Usually this means restoring user file data to
+	 *	regions of the file that look like holes.
+	 *
+	 *	The "old behavior" (from XFS_IOC_GETBMAP) is to not specify
+	 *	BMV_IF_NO_DMAPI_READ so that read events are generated.
+	 *	If this were not true, callers of ioctl( XFS_IOC_GETBMAP )
+	 *	could misinterpret holes in a DMAPI file as true holes,
+	 *	when in fact they may represent offline user data.
+	 */
+	if (   (interface & BMV_IF_NO_DMAPI_READ) == 0
+	    && DM_EVENT_ENABLED(vp->v_vfsp, ip, DM_EVENT_READ)
+	    && whichfork == XFS_DATA_FORK) {
+
+		error = XFS_SEND_DATA(mp, DM_EVENT_READ, vp, 0, 0, 0, NULL);
+		if (error)
+			return XFS_ERROR(error);
+	}
+
+	if (whichfork == XFS_ATTR_FORK) {
+		if (XFS_IFORK_Q(ip)) {
+			if (ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS &&
+			    ip->i_d.di_aformat != XFS_DINODE_FMT_BTREE &&
+			    ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)
+				return XFS_ERROR(EINVAL);
+		} else if (unlikely(
+			   ip->i_d.di_aformat != 0 &&
+			   ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS)) {
+			XFS_ERROR_REPORT("xfs_getbmap", XFS_ERRLEVEL_LOW,
+					 ip->i_mount);
+			return XFS_ERROR(EFSCORRUPTED);
+		}
+	} else if (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS &&
+		   ip->i_d.di_format != XFS_DINODE_FMT_BTREE &&
+		   ip->i_d.di_format != XFS_DINODE_FMT_LOCAL)
+		return XFS_ERROR(EINVAL);
+	if (whichfork == XFS_DATA_FORK) {
+		if (ip->i_d.di_flags & XFS_DIFLAG_PREALLOC) {
+			prealloced = 1;
+			fixlen = XFS_MAXIOFFSET(mp);
+		} else {
+			prealloced = 0;
+			fixlen = ip->i_d.di_size;
+		}
+	} else {
+		prealloced = 0;
+		fixlen = 1LL << 32;
+	}
+
+	if (bmv->bmv_length == -1) {
+		fixlen = XFS_FSB_TO_BB(mp, XFS_B_TO_FSB(mp, fixlen));
+		bmv->bmv_length = MAX( (__int64_t)(fixlen - bmv->bmv_offset),
+					(__int64_t)0);
+	} else if (bmv->bmv_length < 0)
+		return XFS_ERROR(EINVAL);
+	if (bmv->bmv_length == 0) {
+		bmv->bmv_entries = 0;
+		return 0;
+	}
+	nex = bmv->bmv_count - 1;
+	if (nex <= 0)
+		return XFS_ERROR(EINVAL);
+	bmvend = bmv->bmv_offset + bmv->bmv_length;
+
+	xfs_ilock(ip, XFS_IOLOCK_SHARED);
+
+	if (whichfork == XFS_DATA_FORK && ip->i_delayed_blks) {
+		/* xfs_fsize_t last_byte = xfs_file_last_byte(ip); */
+		VOP_FLUSH_PAGES(vp, (xfs_off_t)0, -1, 0, FI_REMAPF, error);
+	}
+
+	ASSERT(whichfork == XFS_ATTR_FORK || ip->i_delayed_blks == 0);
+
+	lock = xfs_ilock_map_shared(ip);
+
+	/*
+	 * Don't let nex be bigger than the number of extents
+	 * we can have assuming alternating holes and real extents.
+	 */
+	if (nex > XFS_IFORK_NEXTENTS(ip, whichfork) * 2 + 1)
+		nex = XFS_IFORK_NEXTENTS(ip, whichfork) * 2 + 1;
+
+	bmapi_flags = XFS_BMAPI_AFLAG(whichfork) |
+			((sh_unwritten) ? 0 : XFS_BMAPI_IGSTATE);
+
+	/*
+	 * Allocate enough space to handle "subnex" maps at a time.
+	 */
+	subnex = 16;
+	map = kmem_alloc(subnex * sizeof(*map), KM_SLEEP);
+
+	bmv->bmv_entries = 0;
+
+	if (XFS_IFORK_NEXTENTS(ip, whichfork) == 0) {
+		error = 0;
+		goto unlock_and_return;
+	}
+
+	nexleft = nex;
+
+	do {
+		nmap = (nexleft > subnex) ? subnex : nexleft;
+		error = xfs_bmapi(NULL, ip, XFS_BB_TO_FSBT(mp, bmv->bmv_offset),
+				  XFS_BB_TO_FSB(mp, bmv->bmv_length),
+				  bmapi_flags, NULL, 0, map, &nmap, NULL);
+		if (error)
+			goto unlock_and_return;
+		ASSERT(nmap <= subnex);
+
+		for (i = 0; i < nmap && nexleft && bmv->bmv_length; i++) {
+			nexleft--;
+			oflags = (map[i].br_state == XFS_EXT_UNWRITTEN) ?
+					BMV_OF_PREALLOC : 0;
+			out.bmv_offset = XFS_FSB_TO_BB(mp, map[i].br_startoff);
+			out.bmv_length = XFS_FSB_TO_BB(mp, map[i].br_blockcount);
+			ASSERT(map[i].br_startblock != DELAYSTARTBLOCK);
+			if (prealloced &&
+			    map[i].br_startblock == HOLESTARTBLOCK &&
+			    out.bmv_offset + out.bmv_length == bmvend) {
+				/*
+				 * came to hole at end of file
+				 */
+				goto unlock_and_return;
+			} else {
+				out.bmv_block =
+				    (map[i].br_startblock == HOLESTARTBLOCK) ?
+					-1 :
+					XFS_FSB_TO_DB(ip, map[i].br_startblock);
+
+				/* return either getbmap/getbmapx structure. */
+				if (interface & BMV_IF_EXTENDED) {
+					struct	getbmapx	outx;
+
+					GETBMAP_CONVERT(out,outx);
+					outx.bmv_oflags = oflags;
+					outx.bmv_unused1 = outx.bmv_unused2 = 0;
+					if (copy_to_user(ap, &outx,
+							sizeof(outx))) {
+						error = XFS_ERROR(EFAULT);
+						goto unlock_and_return;
+					}
+				} else {
+					if (copy_to_user(ap, &out,
+							sizeof(out))) {
+						error = XFS_ERROR(EFAULT);
+						goto unlock_and_return;
+					}
+				}
+				bmv->bmv_offset =
+					out.bmv_offset + out.bmv_length;
+				bmv->bmv_length = MAX((__int64_t)0,
+					(__int64_t)(bmvend - bmv->bmv_offset));
+				bmv->bmv_entries++;
+				ap = (interface & BMV_IF_EXTENDED) ?
+						(void __user *)
+					((struct getbmapx __user *)ap + 1) :
+						(void __user *)
+					((struct getbmap __user *)ap + 1);
+			}
+		}
+	} while (nmap && nexleft && bmv->bmv_length);
+
+unlock_and_return:
+	xfs_iunlock_map_shared(ip, lock);
+	xfs_iunlock(ip, XFS_IOLOCK_SHARED);
+
+	kmem_free(map, subnex * sizeof(*map));
+
+	return error;
+}
+
+/*
+ * Check the last inode extent to determine whether this allocation will result
+ * in blocks being allocated at the end of the file. When we allocate new data
+ * blocks at the end of the file which do not start at the previous data block,
+ * we will try to align the new blocks at stripe unit boundaries.
+ */
+int					/* error */
+xfs_bmap_isaeof(
+	xfs_inode_t	*ip,		/* incore inode pointer */
+	xfs_fileoff_t   off,		/* file offset in fsblocks */
+	int             whichfork,	/* data or attribute fork */
+	char		*aeof)		/* return value */
+{
+	int		error;		/* error return value */
+	xfs_ifork_t	*ifp;		/* inode fork pointer */
+	xfs_bmbt_rec_t	*lastrec;	/* extent list entry pointer */
+	xfs_extnum_t	nextents;	/* size of extent list */
+	xfs_bmbt_irec_t	s;		/* expanded extent list entry */
+
+	ASSERT(whichfork == XFS_DATA_FORK);
+	ifp = XFS_IFORK_PTR(ip, whichfork);
+	if (!(ifp->if_flags & XFS_IFEXTENTS) &&
+	    (error = xfs_iread_extents(NULL, ip, whichfork)))
+		return error;
+	nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
+	if (nextents == 0) {
+		*aeof = 1;
+		return 0;
+	}
+	/*
+	 * Go to the last extent
+	 */
+	lastrec = &ifp->if_u1.if_extents[nextents - 1];
+	xfs_bmbt_get_all(lastrec, &s);
+	/*
+	 * Check we are allocating in the last extent (for delayed allocations)
+	 * or past the last extent for non-delayed allocations.
+	 */
+	*aeof = (off >= s.br_startoff &&
+		 off < s.br_startoff + s.br_blockcount &&
+		 ISNULLSTARTBLOCK(s.br_startblock)) ||
+		off >= s.br_startoff + s.br_blockcount;
+	return 0;
+}
+
+/*
+ * Check if the endoff is outside the last extent. If so the caller will grow
+ * the allocation to a stripe unit boundary.
+ */
+int					/* error */
+xfs_bmap_eof(
+	xfs_inode_t	*ip,		/* incore inode pointer */
+	xfs_fileoff_t	endoff,		/* file offset in fsblocks */
+	int		whichfork,	/* data or attribute fork */
+	int		*eof)		/* result value */
+{
+	xfs_fsblock_t	blockcount;	/* extent block count */
+	int		error;		/* error return value */
+	xfs_ifork_t	*ifp;		/* inode fork pointer */
+	xfs_bmbt_rec_t	*lastrec;	/* extent list entry pointer */
+	xfs_extnum_t	nextents;	/* size of extent list */
+	xfs_fileoff_t	startoff;	/* extent starting file offset */
+
+	ASSERT(whichfork == XFS_DATA_FORK);
+	ifp = XFS_IFORK_PTR(ip, whichfork);
+	if (!(ifp->if_flags & XFS_IFEXTENTS) &&
+	    (error = xfs_iread_extents(NULL, ip, whichfork)))
+		return error;
+	nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
+	if (nextents == 0) {
+		*eof = 1;
+		return 0;
+	}
+	/*
+	 * Go to the last extent
+	 */
+	lastrec = &ifp->if_u1.if_extents[nextents - 1];
+	startoff = xfs_bmbt_get_startoff(lastrec);
+	blockcount = xfs_bmbt_get_blockcount(lastrec);
+	*eof = endoff >= startoff + blockcount;
+	return 0;
+}
+
+#ifdef DEBUG
+/*
+ * Check that the extents list for the inode ip is in the right order.
+ */
+STATIC void
+xfs_bmap_check_extents(
+	xfs_inode_t		*ip,		/* incore inode pointer */
+	int			whichfork)	/* data or attr fork */
+{
+	xfs_bmbt_rec_t		*base;		/* base of extents list */
+	xfs_bmbt_rec_t		*ep;		/* current extent entry */
+	xfs_ifork_t		*ifp;		/* inode fork pointer */
+	xfs_extnum_t		nextents;	/* number of extents in list */
+
+	ifp = XFS_IFORK_PTR(ip, whichfork);
+	ASSERT(ifp->if_flags & XFS_IFEXTENTS);
+	base = ifp->if_u1.if_extents;
+	nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
+	for (ep = base; ep < &base[nextents - 1]; ep++) {
+		xfs_btree_check_rec(XFS_BTNUM_BMAP, (void *)ep,
+			(void *)(ep + 1));
+	}
+}
+
+STATIC
+xfs_buf_t *
+xfs_bmap_get_bp(
+	xfs_btree_cur_t         *cur,
+	xfs_fsblock_t		bno)
+{
+	int i;
+	xfs_buf_t *bp;
+
+	if (!cur)
+		return(NULL);
+
+	bp = NULL;
+	for(i = 0; i < XFS_BTREE_MAXLEVELS; i++) {
+		bp = cur->bc_bufs[i];
+		if (!bp) break;
+		if (XFS_BUF_ADDR(bp) == bno)
+			break;	/* Found it */
+	}
+	if (i == XFS_BTREE_MAXLEVELS)
+		bp = NULL;
+
+	if (!bp) { /* Chase down all the log items to see if the bp is there */
+		xfs_log_item_chunk_t    *licp;
+		xfs_trans_t		*tp;
+
+		tp = cur->bc_tp;
+		licp = &tp->t_items;
+		while (!bp && licp != NULL) {
+			if (XFS_LIC_ARE_ALL_FREE(licp)) {
+				licp = licp->lic_next;
+				continue;
+			}
+			for (i = 0; i < licp->lic_unused; i++) {
+				xfs_log_item_desc_t	*lidp;
+				xfs_log_item_t		*lip;
+				xfs_buf_log_item_t	*bip;
+				xfs_buf_t		*lbp;
+
+				if (XFS_LIC_ISFREE(licp, i)) {
+					continue;
+				}
+
+				lidp = XFS_LIC_SLOT(licp, i);
+				lip = lidp->lid_item;
+				if (lip->li_type != XFS_LI_BUF)
+					continue;
+
+				bip = (xfs_buf_log_item_t *)lip;
+				lbp = bip->bli_buf;
+
+				if (XFS_BUF_ADDR(lbp) == bno) {
+					bp = lbp;
+					break; /* Found it */
+				}
+			}
+			licp = licp->lic_next;
+		}
+	}
+	return(bp);
+}
+
+void
+xfs_check_block(
+	xfs_bmbt_block_t        *block,
+	xfs_mount_t		*mp,
+	int			root,
+	short			sz)
+{
+	int			i, j, dmxr;
+	xfs_bmbt_ptr_t		*pp, *thispa;	/* pointer to block address */
+	xfs_bmbt_key_t		*prevp, *keyp;
+
+	ASSERT(INT_GET(block->bb_level, ARCH_CONVERT) > 0);
+
+	prevp = NULL;
+	for( i = 1; i <= INT_GET(block->bb_numrecs, ARCH_CONVERT);i++) {
+		dmxr = mp->m_bmap_dmxr[0];
+
+		if (root) {
+			keyp = XFS_BMAP_BROOT_KEY_ADDR(block, i, sz);
+		} else {
+			keyp = XFS_BTREE_KEY_ADDR(mp->m_sb.sb_blocksize,
+				xfs_bmbt, block, i, dmxr);
+		}
+
+		if (prevp) {
+			xfs_btree_check_key(XFS_BTNUM_BMAP, prevp, keyp);
+		}
+		prevp = keyp;
+
+		/*
+		 * Compare the block numbers to see if there are dups.
+		 */
+
+		if (root) {
+			pp = XFS_BMAP_BROOT_PTR_ADDR(block, i, sz);
+		} else {
+			pp = XFS_BTREE_PTR_ADDR(mp->m_sb.sb_blocksize,
+				xfs_bmbt, block, i, dmxr);
+		}
+		for (j = i+1; j <= INT_GET(block->bb_numrecs, ARCH_CONVERT); j++) {
+			if (root) {
+				thispa = XFS_BMAP_BROOT_PTR_ADDR(block, j, sz);
+			} else {
+				thispa = XFS_BTREE_PTR_ADDR(mp->m_sb.sb_blocksize,
+					xfs_bmbt, block, j, dmxr);
+			}
+			if (INT_GET(*thispa, ARCH_CONVERT) ==
+			    INT_GET(*pp, ARCH_CONVERT)) {
+				cmn_err(CE_WARN, "%s: thispa(%d) == pp(%d) %Ld",
+					__FUNCTION__, j, i,
+					INT_GET(*thispa, ARCH_CONVERT));
+				panic("%s: ptrs are equal in node\n",
+					__FUNCTION__);
+			}
+		}
+	}
+}
+
+/*
+ * Check that the extents for the inode ip are in the right order in all
+ * btree leaves.
+ */
+
+STATIC void
+xfs_bmap_check_leaf_extents(
+	xfs_btree_cur_t		*cur,	/* btree cursor or null */
+	xfs_inode_t		*ip,		/* incore inode pointer */
+	int			whichfork)	/* data or attr fork */
+{
+	xfs_bmbt_block_t	*block;	/* current btree block */
+	xfs_fsblock_t		bno;	/* block # of "block" */
+	xfs_buf_t		*bp;	/* buffer for "block" */
+	int			error;	/* error return value */
+	xfs_extnum_t		i=0;	/* index into the extents list */
+	xfs_ifork_t		*ifp;	/* fork structure */
+	int			level;	/* btree level, for checking */
+	xfs_mount_t		*mp;	/* file system mount structure */
+	xfs_bmbt_ptr_t		*pp;	/* pointer to block address */
+	xfs_bmbt_rec_t		*ep, *lastp;	/* extent pointers in block entry */
+	int			bp_release = 0;
+
+	if (XFS_IFORK_FORMAT(ip, whichfork) != XFS_DINODE_FMT_BTREE) {
+		return;
+	}
+
+	bno = NULLFSBLOCK;
+	mp = ip->i_mount;
+	ifp = XFS_IFORK_PTR(ip, whichfork);
+	block = ifp->if_broot;
+	/*
+	 * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
+	 */
+	ASSERT(INT_GET(block->bb_level, ARCH_CONVERT) > 0);
+	level = INT_GET(block->bb_level, ARCH_CONVERT);
+	xfs_check_block(block, mp, 1, ifp->if_broot_bytes);
+	pp = XFS_BMAP_BROOT_PTR_ADDR(block, 1, ifp->if_broot_bytes);
+	ASSERT(INT_GET(*pp, ARCH_CONVERT) != NULLDFSBNO);
+	ASSERT(XFS_FSB_TO_AGNO(mp, INT_GET(*pp, ARCH_CONVERT)) < mp->m_sb.sb_agcount);
+	ASSERT(XFS_FSB_TO_AGBNO(mp, INT_GET(*pp, ARCH_CONVERT)) < mp->m_sb.sb_agblocks);
+	bno = INT_GET(*pp, ARCH_CONVERT);
+	/*
+	 * Go down the tree until leaf level is reached, following the first
+	 * pointer (leftmost) at each level.
+	 */
+	while (level-- > 0) {
+		/* See if buf is in cur first */
+		bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno));
+		if (bp) {
+			bp_release = 0;
+		} else {
+			bp_release = 1;
+		}
+		if (!bp && (error = xfs_btree_read_bufl(mp, NULL, bno, 0, &bp,
+				XFS_BMAP_BTREE_REF)))
+			goto error_norelse;
+		block = XFS_BUF_TO_BMBT_BLOCK(bp);
+		XFS_WANT_CORRUPTED_GOTO(
+			XFS_BMAP_SANITY_CHECK(mp, block, level),
+			error0);
+		if (level == 0)
+			break;
+
+		/*
+		 * Check this block for basic sanity (increasing keys and
+		 * no duplicate blocks).
+		 */
+
+		xfs_check_block(block, mp, 0, 0);
+		pp = XFS_BTREE_PTR_ADDR(mp->m_sb.sb_blocksize, xfs_bmbt, block,
+			1, mp->m_bmap_dmxr[1]);
+		XFS_WANT_CORRUPTED_GOTO(XFS_FSB_SANITY_CHECK(mp, INT_GET(*pp, ARCH_CONVERT)), error0);
+		bno = INT_GET(*pp, ARCH_CONVERT);
+		if (bp_release) {
+			bp_release = 0;
+			xfs_trans_brelse(NULL, bp);
+		}
+	}
+
+	/*
+	 * Here with bp and block set to the leftmost leaf node in the tree.
+	 */
+	i = 0;
+
+	/*
+	 * Loop over all leaf nodes checking that all extents are in the right order.
+	 */
+	lastp = NULL;
+	for (;;) {
+		xfs_bmbt_rec_t	*frp;
+		xfs_fsblock_t	nextbno;
+		xfs_extnum_t	num_recs;
+
+
+		num_recs = INT_GET(block->bb_numrecs, ARCH_CONVERT);
+
+		/*
+		 * Read-ahead the next leaf block, if any.
+		 */
+
+		nextbno = INT_GET(block->bb_rightsib, ARCH_CONVERT);
+
+		/*
+		 * Check all the extents to make sure they are OK.
+		 * If we had a previous block, the last entry should
+		 * conform with the first entry in this one.
+		 */
+
+		frp = XFS_BTREE_REC_ADDR(mp->m_sb.sb_blocksize, xfs_bmbt,
+			block, 1, mp->m_bmap_dmxr[0]);
+
+		for (ep = frp;ep < frp + (num_recs - 1); ep++) {
+			if (lastp) {
+				xfs_btree_check_rec(XFS_BTNUM_BMAP,
+					(void *)lastp, (void *)ep);
+			}
+			xfs_btree_check_rec(XFS_BTNUM_BMAP, (void *)ep,
+				(void *)(ep + 1));
+		}
+		lastp = frp + num_recs - 1; /* For the next iteration */
+
+		i += num_recs;
+		if (bp_release) {
+			bp_release = 0;
+			xfs_trans_brelse(NULL, bp);
+		}
+		bno = nextbno;
+		/*
+		 * If we've reached the end, stop.
+		 */
+		if (bno == NULLFSBLOCK)
+			break;
+
+		bp = xfs_bmap_get_bp(cur, XFS_FSB_TO_DADDR(mp, bno));
+		if (bp) {
+			bp_release = 0;
+		} else {
+			bp_release = 1;
+		}
+		if (!bp && (error = xfs_btree_read_bufl(mp, NULL, bno, 0, &bp,
+				XFS_BMAP_BTREE_REF)))
+			goto error_norelse;
+		block = XFS_BUF_TO_BMBT_BLOCK(bp);
+	}
+	if (bp_release) {
+		bp_release = 0;
+		xfs_trans_brelse(NULL, bp);
+	}
+	return;
+
+error0:
+	cmn_err(CE_WARN, "%s: at error0", __FUNCTION__);
+	if (bp_release)
+		xfs_trans_brelse(NULL, bp);
+error_norelse:
+	cmn_err(CE_WARN, "%s: BAD after btree leaves for %d extents",
+		i, __FUNCTION__);
+	panic("%s: CORRUPTED BTREE OR SOMETHING", __FUNCTION__);
+	return;
+}
+#endif
+
+/*
+ * Count fsblocks of the given fork.
+ */
+int						/* error */
+xfs_bmap_count_blocks(
+	xfs_trans_t		*tp,		/* transaction pointer */
+	xfs_inode_t		*ip,		/* incore inode */
+	int			whichfork,	/* data or attr fork */
+	int			*count)		/* out: count of blocks */
+{
+	xfs_bmbt_block_t	*block;	/* current btree block */
+	xfs_fsblock_t		bno;	/* block # of "block" */
+	xfs_ifork_t		*ifp;	/* fork structure */
+	int			level;	/* btree level, for checking */
+	xfs_mount_t		*mp;	/* file system mount structure */
+	xfs_bmbt_ptr_t		*pp;	/* pointer to block address */
+
+	bno = NULLFSBLOCK;
+	mp = ip->i_mount;
+	ifp = XFS_IFORK_PTR(ip, whichfork);
+	if ( XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS ) {
+		if (unlikely(xfs_bmap_count_leaves(ifp->if_u1.if_extents,
+			ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t),
+			count) < 0)) {
+			XFS_ERROR_REPORT("xfs_bmap_count_blocks(1)",
+					 XFS_ERRLEVEL_LOW, mp);
+			return XFS_ERROR(EFSCORRUPTED);
+		}
+		return 0;
+	}
+
+	/*
+	 * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
+	 */
+	block = ifp->if_broot;
+	ASSERT(INT_GET(block->bb_level, ARCH_CONVERT) > 0);
+	level = INT_GET(block->bb_level, ARCH_CONVERT);
+	pp = XFS_BMAP_BROOT_PTR_ADDR(block, 1, ifp->if_broot_bytes);
+	ASSERT(INT_GET(*pp, ARCH_CONVERT) != NULLDFSBNO);
+	ASSERT(XFS_FSB_TO_AGNO(mp, INT_GET(*pp, ARCH_CONVERT)) < mp->m_sb.sb_agcount);
+	ASSERT(XFS_FSB_TO_AGBNO(mp, INT_GET(*pp, ARCH_CONVERT)) < mp->m_sb.sb_agblocks);
+	bno = INT_GET(*pp, ARCH_CONVERT);
+
+	if (unlikely(xfs_bmap_count_tree(mp, tp, bno, level, count) < 0)) {
+		XFS_ERROR_REPORT("xfs_bmap_count_blocks(2)", XFS_ERRLEVEL_LOW,
+				 mp);
+		return XFS_ERROR(EFSCORRUPTED);
+	}
+
+	return 0;
+}
+
+/*
+ * Recursively walks each level of a btree
+ * to count total fsblocks is use.
+ */
+int                                     /* error */
+xfs_bmap_count_tree(
+	xfs_mount_t     *mp,            /* file system mount point */
+	xfs_trans_t     *tp,            /* transaction pointer */
+	xfs_fsblock_t   blockno,	/* file system block number */
+	int             levelin,	/* level in btree */
+	int		*count)		/* Count of blocks */
+{
+	int			error;
+	xfs_buf_t		*bp, *nbp;
+	int			level = levelin;
+	xfs_bmbt_ptr_t          *pp;
+	xfs_fsblock_t           bno = blockno;
+	xfs_fsblock_t		nextbno;
+	xfs_bmbt_block_t        *block, *nextblock;
+	int			numrecs;
+	xfs_bmbt_rec_t		*frp;
+
+	if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp, XFS_BMAP_BTREE_REF)))
+		return error;
+	*count += 1;
+	block = XFS_BUF_TO_BMBT_BLOCK(bp);
+
+	if (--level) {
+		/* Not at node above leafs, count this level of nodes */
+		nextbno = INT_GET(block->bb_rightsib, ARCH_CONVERT);
+		while (nextbno != NULLFSBLOCK) {
+			if ((error = xfs_btree_read_bufl(mp, tp, nextbno,
+				0, &nbp, XFS_BMAP_BTREE_REF)))
+				return error;
+			*count += 1;
+			nextblock = XFS_BUF_TO_BMBT_BLOCK(nbp);
+			nextbno = INT_GET(nextblock->bb_rightsib, ARCH_CONVERT);
+			xfs_trans_brelse(tp, nbp);
+		}
+
+		/* Dive to the next level */
+		pp = XFS_BTREE_PTR_ADDR(mp->m_sb.sb_blocksize,
+			xfs_bmbt, block, 1, mp->m_bmap_dmxr[1]);
+		bno = INT_GET(*pp, ARCH_CONVERT);
+		if (unlikely((error =
+		     xfs_bmap_count_tree(mp, tp, bno, level, count)) < 0)) {
+			xfs_trans_brelse(tp, bp);
+			XFS_ERROR_REPORT("xfs_bmap_count_tree(1)",
+					 XFS_ERRLEVEL_LOW, mp);
+			return XFS_ERROR(EFSCORRUPTED);
+		}
+		xfs_trans_brelse(tp, bp);
+	} else {
+		/* count all level 1 nodes and their leaves */
+		for (;;) {
+			nextbno = INT_GET(block->bb_rightsib, ARCH_CONVERT);
+			numrecs = INT_GET(block->bb_numrecs, ARCH_CONVERT);
+			frp = XFS_BTREE_REC_ADDR(mp->m_sb.sb_blocksize,
+				xfs_bmbt, block, 1, mp->m_bmap_dmxr[0]);
+			if (unlikely(xfs_bmap_count_leaves(frp, numrecs, count) < 0)) {
+				xfs_trans_brelse(tp, bp);
+				XFS_ERROR_REPORT("xfs_bmap_count_tree(2)",
+						 XFS_ERRLEVEL_LOW, mp);
+				return XFS_ERROR(EFSCORRUPTED);
+			}
+			xfs_trans_brelse(tp, bp);
+			if (nextbno == NULLFSBLOCK)
+				break;
+			bno = nextbno;
+			if ((error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
+				XFS_BMAP_BTREE_REF)))
+				return error;
+			*count += 1;
+			block = XFS_BUF_TO_BMBT_BLOCK(bp);
+		}
+	}
+	return 0;
+}
+
+/*
+ * Count leaf blocks given a pointer to an extent list.
+ */
+int
+xfs_bmap_count_leaves(
+	xfs_bmbt_rec_t		*frp,
+	int			numrecs,
+	int			*count)
+{
+	int		b;
+
+	for ( b = 1; b <= numrecs; b++, frp++)
+		*count += xfs_bmbt_disk_get_blockcount(frp);
+	return 0;
+}