path: root/fs/xfs/xfs_bmap.c

/*
 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
 * All Rights Reserved.
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms 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.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write the Free Software Foundation,
 * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
 */
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_types.h"
#include "xfs_bit.h"
#include "xfs_log.h"
#include "xfs_inum.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_dir2.h"
#include "xfs_da_btree.h"
#include "xfs_bmap_btree.h"
#include "xfs_alloc_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_dir2_sf.h"
#include "xfs_attr_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_btree.h"
#include "xfs_dmapi.h"
#include "xfs_mount.h"
#include "xfs_ialloc.h"
#include "xfs_itable.h"
#include "xfs_dir2_data.h"
#include "xfs_dir2_leaf.h"
#include "xfs_dir2_block.h"
#include "xfs_inode_item.h"
#include "xfs_extfree_item.h"
#include "xfs_alloc.h"
#include "xfs_bmap.h"
#include "xfs_rtalloc.h"
#include "xfs_error.h"
#include "xfs_attr_leaf.h"
#include "xfs_rw.h"
#include "xfs_quota.h"
#include "xfs_trans_space.h"
#include "xfs_buf_item.h"
#include "xfs_filestream.h"
#include "xfs_vnodeops.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 file extent records 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 add to file extents */
	xfs_fsblock_t		*first,	/* pointer to firstblock variable */
	xfs_bmap_free_t		*flist,	/* list of extents to be freed */
	int			*logflagsp, /* inode logging flags */
	xfs_extdelta_t		*delta, /* Change made to incore extents */
	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 add to file extents */
	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 */
	xfs_extdelta_t		*delta, /* Change made to incore extents */
	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_bmbt_irec_t		*new,	/* new data to add to file extents */
	int			*logflagsp,/* inode logging flags */
	xfs_extdelta_t		*delta, /* Change made to incore extents */
	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 add to file extents */
	int			*logflagsp, /* inode logging flags */
	xfs_extdelta_t		*delta, /* Change made to incore extents */
	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 add to file extents */
	int			*logflagsp, /* inode logging flags */
	xfs_extdelta_t		*delta); /* Change made to incore extents */

/*
 * 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 file extents are 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 */

/*
 * Called by xfs_bmapi to update file extent records 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 add to file extents */
	int			*logflagsp,/* inode logging flags */
	xfs_extdelta_t		*delta, /* Change made to incore extents */
	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 */

/*
 * 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 */

/*
 * 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_host_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 */

/*
 * 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.
 */
STATIC 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 */

#ifdef XFS_BMAP_TRACE
/*
 * Add bmap trace entry prior to a call to xfs_iext_remove.
 */
STATIC void
xfs_bmap_trace_delete(
	const 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_iext_insert, or
 * reading in the extents list from the disk (in the btree).
 */
STATIC void
xfs_bmap_trace_insert(
	const 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 record in place.
 */
STATIC void
xfs_bmap_trace_post_update(
	const 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 record in place.
 */
STATIC void
xfs_bmap_trace_pre_update(
	const 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 */

#define	XFS_BMAP_TRACE_DELETE(d,ip,i,c,w)	\
	xfs_bmap_trace_delete(__func__,d,ip,i,c,w)
#define	XFS_BMAP_TRACE_INSERT(d,ip,i,c,r1,r2,w)	\
	xfs_bmap_trace_insert(__func__,d,ip,i,c,r1,r2,w)
#define	XFS_BMAP_TRACE_POST_UPDATE(d,ip,i,w)	\
	xfs_bmap_trace_post_update(__func__,d,ip,i,w)
#define	XFS_BMAP_TRACE_PRE_UPDATE(d,ip,i,w)	\
	xfs_bmap_trace_pre_update(__func__,d,ip,i,w)
#else
#define	XFS_BMAP_TRACE_DELETE(d,ip,i,c,w)
#define	XFS_BMAP_TRACE_INSERT(d,ip,i,c,r1,r2,w)
#define	XFS_BMAP_TRACE_POST_UPDATE(d,ip,i,w)
#define	XFS_BMAP_TRACE_PRE_UPDATE(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_ifork_t	*ifp,
	xfs_fsblock_t   blockno,
	int             levelin,
	int		*count);

STATIC void
xfs_bmap_count_leaves(
	xfs_ifork_t		*ifp,
	xfs_extnum_t		idx,
	int			numrecs,
	int			*count);

STATIC void
xfs_bmap_disk_count_leaves(
	struct xfs_mount	*mp,
	struct xfs_btree_block	*block,
	int			numrecs,
	int			*count);

/*
 * Bmap internal routines.
 */

STATIC int				/* error */
xfs_bmbt_lookup_eq(
	struct xfs_btree_cur	*cur,
	xfs_fileoff_t		off,
	xfs_fsblock_t		bno,
	xfs_filblks_t		len,
	int			*stat)	/* success/failure */
{
	cur->bc_rec.b.br_startoff = off;
	cur->bc_rec.b.br_startblock = bno;
	cur->bc_rec.b.br_blockcount = len;
	return xfs_btree_lookup(cur, XFS_LOOKUP_EQ, stat);
}

STATIC int				/* error */
xfs_bmbt_lookup_ge(
	struct xfs_btree_cur	*cur,
	xfs_fileoff_t		off,
	xfs_fsblock_t		bno,
	xfs_filblks_t		len,
	int			*stat)	/* success/failure */
{
	cur->bc_rec.b.br_startoff = off;
	cur->bc_rec.b.br_startblock = bno;
	cur->bc_rec.b.br_blockcount = len;
	return xfs_btree_lookup(cur, XFS_LOOKUP_GE, stat);
}

/*
* Update the record referred to by cur to the value given
 * by [off, bno, len, state].
 * This either works (return 0) or gets an EFSCORRUPTED error.
 */
STATIC int
xfs_bmbt_update(
	struct xfs_btree_cur	*cur,
	xfs_fileoff_t		off,
	xfs_fsblock_t		bno,
	xfs_filblks_t		len,
	xfs_exntst_t		state)
{
	union xfs_btree_rec	rec;

	xfs_bmbt_disk_set_allf(&rec.bmbt, off, bno, len, state);
	return xfs_btree_update(cur, &rec);
}

/*
 * 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_bmbt_init_cursor(mp, tp, 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;
		/* must be at least one entry */
		XFS_WANT_CORRUPTED_GOTO(stat == 1, error0);
		if ((error = xfs_btree_new_iroot(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_dir2_sf_to_block(&dargs);
	} else
		error = xfs_bmap_local_to_extents(tp, ip, firstblock, 1, flags,
			XFS_DATA_FORK);
	return error;
}

/*
 * Called by xfs_bmapi to update file extent records 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 add to file extents */
	xfs_fsblock_t		*first,	/* pointer to firstblock variable */
	xfs_bmap_free_t		*flist,	/* list of extents to be freed */
	int			*logflagsp, /* inode logging flags */
	xfs_extdelta_t		*delta, /* Change made to incore extents */
	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 */
	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("insert empty", ip, 0, 1, new, NULL,
			whichfork);
		xfs_iext_insert(ifp, 0, 1, new);
		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;
		/* DELTA: single new extent */
		if (delta) {
			if (delta->xed_startoff > new->br_startoff)
				delta->xed_startoff = new->br_startoff;
			if (delta->xed_blockcount <
					new->br_startoff + new->br_blockcount)
				delta->xed_blockcount = new->br_startoff +
						new->br_blockcount;
		}
	}
	/*
	 * 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, new,
				&logflags, delta, 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, delta, 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(xfs_iext_get_ext(ifp, 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, delta, 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, delta)))
					goto done;
			} else {
				ASSERT(new->br_state == XFS_EXT_UNWRITTEN);
				if ((error = xfs_bmap_add_extent_unwritten_real(
					ip, idx, &cur, new, &logflags, delta)))
					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, delta, 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,
				(int64_t)(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 add to file extents */
	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 */
	xfs_extdelta_t		*delta, /* Change made to incore extents */
	int			rsvd)	/* OK to use reserved data block allocation */
{
	xfs_btree_cur_t		*cur;	/* btree cursor */
	int			diff;	/* temp value */
	xfs_bmbt_rec_host_t	*ep;	/* extent entry for idx */
	int			error;	/* error return value */
	int			i;	/* temp state */
	xfs_ifork_t		*ifp;	/* inode fork pointer */
	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=0;	/* value for dnew calculations */
	xfs_filblks_t		temp2=0;/* 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;
	ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
	ep = xfs_iext_get_ext(ifp, 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(xfs_iext_get_ext(ifp, idx - 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(xfs_iext_get_ext(ifp, idx + 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("LF|RF|LC|RC", ip, idx - 1,
			XFS_DATA_FORK);
		xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
			LEFT.br_blockcount + PREV.br_blockcount +
			RIGHT.br_blockcount);
		XFS_BMAP_TRACE_POST_UPDATE("LF|RF|LC|RC", ip, idx - 1,
			XFS_DATA_FORK);
		XFS_BMAP_TRACE_DELETE("LF|RF|LC|RC", ip, idx, 2, XFS_DATA_FORK);
		xfs_iext_remove(ifp, idx, 2);
		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;
			XFS_WANT_CORRUPTED_GOTO(i == 1, done);
			if ((error = xfs_btree_delete(cur, &i)))
				goto done;
			XFS_WANT_CORRUPTED_GOTO(i == 1, done);
			if ((error = xfs_btree_decrement(cur, 0, &i)))
				goto done;
			XFS_WANT_CORRUPTED_GOTO(i == 1, done);
			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;
		/* DELTA: Three in-core extents are replaced by one. */
		temp = LEFT.br_startoff;
		temp2 = LEFT.br_blockcount +
			PREV.br_blockcount +
			RIGHT.br_blockcount;
		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("LF|RF|LC", ip, idx - 1,
			XFS_DATA_FORK);
		xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
			LEFT.br_blockcount + PREV.br_blockcount);
		XFS_BMAP_TRACE_POST_UPDATE("LF|RF|LC", ip, idx - 1,
			XFS_DATA_FORK);
		ip->i_df.if_lastex = idx - 1;
		XFS_BMAP_TRACE_DELETE("LF|RF|LC", ip, idx, 1, XFS_DATA_FORK);
		xfs_iext_remove(ifp, 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;
			XFS_WANT_CORRUPTED_GOTO(i == 1, done);
			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;
		/* DELTA: Two in-core extents are replaced by one. */
		temp = LEFT.br_startoff;
		temp2 = LEFT.br_blockcount +
			PREV.br_blockcount;
		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("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("LF|RF|RC", ip, idx, XFS_DATA_FORK);
		ip->i_df.if_lastex = idx;
		XFS_BMAP_TRACE_DELETE("LF|RF|RC", ip, idx + 1, 1, XFS_DATA_FORK);
		xfs_iext_remove(ifp, idx + 1, 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;
			XFS_WANT_CORRUPTED_GOTO(i == 1, done);
			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;
		/* DELTA: Two in-core extents are replaced by one. */
		temp = PREV.br_startoff;
		temp2 = PREV.br_blockcount +
			RIGHT.br_blockcount;
		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("LF|RF", ip, idx, XFS_DATA_FORK);
		xfs_bmbt_set_startblock(ep, new->br_startblock);
		XFS_BMAP_TRACE_POST_UPDATE("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;
			XFS_WANT_CORRUPTED_GOTO(i == 0, done);
			cur->bc_rec.b.br_state = XFS_EXT_NORM;
			if ((error = xfs_btree_insert(cur, &i)))
				goto done;
			XFS_WANT_CORRUPTED_GOTO(i == 1, done);
		}
		*dnew = 0;
		/* DELTA: The in-core extent described by new changed type. */
		temp = new->br_startoff;
		temp2 = new->br_blockcount;
		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("LF|LC", ip, idx - 1, XFS_DATA_FORK);
		xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
			LEFT.br_blockcount + new->br_blockcount);
		xfs_bmbt_set_startoff(ep,
			PREV.br_startoff + new->br_blockcount);
		XFS_BMAP_TRACE_POST_UPDATE("LF|LC", ip, idx - 1, XFS_DATA_FORK);
		temp = PREV.br_blockcount - new->br_blockcount;
		XFS_BMAP_TRACE_PRE_UPDATE("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;
			XFS_WANT_CORRUPTED_GOTO(i == 1, done);
			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("LF|LC", ip, idx, XFS_DATA_FORK);
		*dnew = temp;
		/* DELTA: The boundary between two in-core extents moved. */
		temp = LEFT.br_startoff;
		temp2 = LEFT.br_blockcount +
			PREV.br_blockcount;
		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("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("LF", ip, idx, 1, new, NULL,
			XFS_DATA_FORK);
		xfs_iext_insert(ifp, idx, 1, new);
		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;
			XFS_WANT_CORRUPTED_GOTO(i == 0, done);
			cur->bc_rec.b.br_state = XFS_EXT_NORM;
			if ((error = xfs_btree_insert(cur, &i)))
				goto done;
			XFS_WANT_CORRUPTED_GOTO(i == 1, done);
		}
		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));
		ep = xfs_iext_get_ext(ifp, idx + 1);
		xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
		XFS_BMAP_TRACE_POST_UPDATE("LF", ip, idx + 1, XFS_DATA_FORK);
		*dnew = temp;
		/* DELTA: One in-core extent is split in two. */
		temp = PREV.br_startoff;
		temp2 = PREV.br_blockcount;
		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("RF|RC", ip, idx, XFS_DATA_FORK);
		XFS_BMAP_TRACE_PRE_UPDATE("RF|RC", ip, idx + 1, XFS_DATA_FORK);
		xfs_bmbt_set_blockcount(ep, temp);
		xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, idx + 1),
			new->br_startoff, new->br_startblock,
			new->br_blockcount + RIGHT.br_blockcount,
			RIGHT.br_state);
		XFS_BMAP_TRACE_POST_UPDATE("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;
			XFS_WANT_CORRUPTED_GOTO(i == 1, done);
			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("RF|RC", ip, idx, XFS_DATA_FORK);
		*dnew = temp;
		/* DELTA: The boundary between two in-core extents moved. */
		temp = PREV.br_startoff;
		temp2 = PREV.br_blockcount +
			RIGHT.br_blockcount;
		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("RF", ip, idx, XFS_DATA_FORK);
		xfs_bmbt_set_blockcount(ep, temp);
		XFS_BMAP_TRACE_INSERT("RF", ip, idx + 1, 1, new, NULL,
			XFS_DATA_FORK);
		xfs_iext_insert(ifp, idx + 1, 1, new);
		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;
			XFS_WANT_CORRUPTED_GOTO(i == 0, done);
			cur->bc_rec.b.br_state = XFS_EXT_NORM;
			if ((error = xfs_btree_insert(cur, &i)))
				goto done;
			XFS_WANT_CORRUPTED_GOTO(i == 1, done);
		}
		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));
		ep = xfs_iext_get_ext(ifp, idx);
		xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
		XFS_BMAP_TRACE_POST_UPDATE("RF", ip, idx, XFS_DATA_FORK);
		*dnew = temp;
		/* DELTA: One in-core extent is split in two. */
		temp = PREV.br_startoff;
		temp2 = PREV.br_blockcount;
		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("0", ip, idx, XFS_DATA_FORK);
		xfs_bmbt_set_blockcount(ep, temp);
		r[0] = *new;
		r[1].br_state = PREV.br_state;
		r[1].br_startblock = 0;
		r[1].br_startoff = new_endoff;
		temp2 = PREV.br_startoff + PREV.br_blockcount - new_endoff;
		r[1].br_blockcount = temp2;
		XFS_BMAP_TRACE_INSERT("0", ip, idx + 1, 2, &r[0], &r[1],
			XFS_DATA_FORK);
		xfs_iext_insert(ifp, idx + 1, 2, &r[0]);
		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;
			XFS_WANT_CORRUPTED_GOTO(i == 0, done);
			cur->bc_rec.b.br_state = XFS_EXT_NORM;
			if ((error = xfs_btree_insert(cur, &i)))
				goto done;
			XFS_WANT_CORRUPTED_GOTO(i == 1, done);
		}
		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, -((int64_t)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, -((int64_t)diff), rsvd))
						break;
				}
				if (temp2) {
					temp2--;
					diff--;
					if (!diff ||
					    !xfs_mod_incore_sb(ip->i_mount,
						    XFS_SBS_FDBLOCKS, -((int64_t)diff), rsvd))
						break;
				}
			}
		}
		ep = xfs_iext_get_ext(ifp, idx);
		xfs_bmbt_set_startblock(ep, nullstartblock((int)temp));
		XFS_BMAP_TRACE_POST_UPDATE("0", ip, idx, XFS_DATA_FORK);
		XFS_BMAP_TRACE_PRE_UPDATE("0", ip, idx + 2, XFS_DATA_FORK);
		xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, idx + 2),
			nullstartblock((int)temp2));
		XFS_BMAP_TRACE_POST_UPDATE("0", ip, idx + 2, XFS_DATA_FORK);
		*dnew = temp + temp2;
		/* DELTA: One in-core extent is split in three. */
		temp = PREV.br_startoff;
		temp2 = PREV.br_blockcount;
		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;
	if (delta) {
		temp2 += temp;
		if (delta->xed_startoff > temp)
			delta->xed_startoff = temp;
		if (delta->xed_blockcount < temp2)
			delta->xed_blockcount = temp2;
	}
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 add to file extents */
	int			*logflagsp, /* inode logging flags */
	xfs_extdelta_t		*delta) /* Change made to incore extents */
{
	xfs_btree_cur_t		*cur;	/* btree cursor */
	xfs_bmbt_rec_host_t	*ep;	/* extent entry for idx */
	int			error;	/* error return value */
	int			i;	/* temp state */
	xfs_ifork_t		*ifp;	/* inode fork pointer */
	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 */
	xfs_filblks_t		temp=0;
	xfs_filblks_t		temp2=0;
	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;
	ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
	ep = xfs_iext_get_ext(ifp, 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(xfs_iext_get_ext(ifp, idx - 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(xfs_iext_get_ext(ifp, idx + 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("LF|RF|LC|RC", ip, idx - 1,
			XFS_DATA_FORK);
		xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
			LEFT.br_blockcount + PREV.br_blockcount +
			RIGHT.br_blockcount);
		XFS_BMAP_TRACE_POST_UPDATE("LF|RF|LC|RC", ip, idx - 1,
			XFS_DATA_FORK);
		XFS_BMAP_TRACE_DELETE("LF|RF|LC|RC", ip, idx, 2, XFS_DATA_FORK);
		xfs_iext_remove(ifp, idx, 2);
		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;
			XFS_WANT_CORRUPTED_GOTO(i == 1, done);
			if ((error = xfs_btree_delete(cur, &i)))
				goto done;
			XFS_WANT_CORRUPTED_GOTO(i == 1, done);
			if ((error = xfs_btree_decrement(cur, 0, &i)))
				goto done;
			XFS_WANT_CORRUPTED_GOTO(i == 1, done);
			if ((error = xfs_btree_delete(cur, &i)))
				goto done;
			XFS_WANT_CORRUPTED_GOTO(i == 1, done);
			if ((error = xfs_btree_decrement(cur, 0, &i)))
				goto done;
			XFS_WANT_CORRUPTED_GOTO(i == 1, done);
			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;
		}
		/* DELTA: Three in-core extents are replaced by one. */
		temp = LEFT.br_startoff;
		temp2 = LEFT.br_blockcount +
			PREV.br_blockcount +
			RIGHT.br_blockcount;
		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("LF|RF|LC", ip, idx - 1,
			XFS_DATA_FORK);
		xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
			LEFT.br_blockcount + PREV.br_blockcount);
		XFS_BMAP_TRACE_POST_UPDATE("LF|RF|LC", ip, idx - 1,
			XFS_DATA_FORK);
		ip->i_df.if_lastex = idx - 1;
		XFS_BMAP_TRACE_DELETE("LF|RF|LC", ip, idx, 1, XFS_DATA_FORK);
		xfs_iext_remove(ifp, 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;
			XFS_WANT_CORRUPTED_GOTO(i == 1, done);
			if ((error = xfs_btree_delete(cur, &i)))
				goto done;
			XFS_WANT_CORRUPTED_GOTO(i == 1, done);
			if ((error = xfs_btree_decrement(cur, 0, &i)))
				goto done;
			XFS_WANT_CORRUPTED_GOTO(i == 1, done);
			if ((error = xfs_bmbt_update(cur, LEFT.br_startoff,
				LEFT.br_startblock,
				LEFT.br_blockcount + PREV.br_blockcount,
				LEFT.br_state)))
				goto done;
		}
		/* DELTA: Two in-core extents are replaced by one. */
		temp = LEFT.br_startoff;
		temp2 = LEFT.br_blockcount +
			PREV.br_blockcount;
		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("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("LF|RF|RC", ip, idx,
			XFS_DATA_FORK);
		ip->i_df.if_lastex = idx;
		XFS_BMAP_TRACE_DELETE("LF|RF|RC", ip, idx + 1, 1, XFS_DATA_FORK);
		xfs_iext_remove(ifp, idx + 1, 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;
			XFS_WANT_CORRUPTED_GOTO(i == 1, done);
			if ((error = xfs_btree_delete(cur, &i)))
				goto done;
			XFS_WANT_CORRUPTED_GOTO(i == 1, done);
			if ((error = xfs_btree_decrement(cur, 0, &i)))
				goto done;
			XFS_WANT_CORRUPTED_GOTO(i == 1, done);
			if ((error = xfs_bmbt_update(cur, new->br_startoff,
				new->br_startblock,
				new->br_blockcount + RIGHT.br_blockcount,
				newext)))
				goto done;
		}
		/* DELTA: Two in-core extents are replaced by one. */
		temp = PREV.br_startoff;
		temp2 = PREV.br_blockcount +
			RIGHT.br_blockcount;
		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("LF|RF", ip, idx,
			XFS_DATA_FORK);
		xfs_bmbt_set_state(ep, newext);
		XFS_BMAP_TRACE_POST_UPDATE("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;
			XFS_WANT_CORRUPTED_GOTO(i == 1, done);
			if ((error = xfs_bmbt_update(cur, new->br_startoff,
				new->br_startblock, new->br_blockcount,
				newext)))
				goto done;
		}
		/* DELTA: The in-core extent described by new changed type. */
		temp = new->br_startoff;
		temp2 = new->br_blockcount;
		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("LF|LC", ip, idx - 1,
			XFS_DATA_FORK);
		xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
			LEFT.br_blockcount + new->br_blockcount);
		xfs_bmbt_set_startoff(ep,
			PREV.br_startoff + new->br_blockcount);
		XFS_BMAP_TRACE_POST_UPDATE("LF|LC", ip, idx - 1,
			XFS_DATA_FORK);
		XFS_BMAP_TRACE_PRE_UPDATE("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("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;
			XFS_WANT_CORRUPTED_GOTO(i == 1, done);
			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_btree_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;
		}
		/* DELTA: The boundary between two in-core extents moved. */
		temp = LEFT.br_startoff;
		temp2 = LEFT.br_blockcount +
			PREV.br_blockcount;
		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("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("LF", ip, idx, XFS_DATA_FORK);
		XFS_BMAP_TRACE_INSERT("LF", ip, idx, 1, new, NULL,
			XFS_DATA_FORK);
		xfs_iext_insert(ifp, idx, 1, new);
		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;
			XFS_WANT_CORRUPTED_GOTO(i == 1, done);
			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_btree_insert(cur, &i)))
				goto done;
			XFS_WANT_CORRUPTED_GOTO(i == 1, done);
		}
		/* DELTA: One in-core extent is split in two. */
		temp = PREV.br_startoff;
		temp2 = PREV.br_blockcount;
		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("RF|RC", ip, idx,
			XFS_DATA_FORK);
		XFS_BMAP_TRACE_PRE_UPDATE("RF|RC", ip, idx + 1,
			XFS_DATA_FORK);
		xfs_bmbt_set_blockcount(ep,
			PREV.br_blockcount - new->br_blockcount);
		XFS_BMAP_TRACE_POST_UPDATE("RF|RC", ip, idx,
			XFS_DATA_FORK);
		xfs_bmbt_set_allf(xfs_iext_get_ext(ifp, idx + 1),
			new->br_startoff, new->br_startblock,
			new->br_blockcount + RIGHT.br_blockcount, newext);
		XFS_BMAP_TRACE_POST_UPDATE("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;
			XFS_WANT_CORRUPTED_GOTO(i == 1, done);
			if ((error = xfs_bmbt_update(cur, PREV.br_startoff,
				PREV.br_startblock,
				PREV.br_blockcount - new->br_blockcount,
				oldext)))
				goto done;
			if ((error = xfs_btree_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;
		}
		/* DELTA: The boundary between two in-core extents moved. */
		temp = PREV.br_startoff;
		temp2 = PREV.br_blockcount +
			RIGHT.br_blockcount;
		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("RF", ip, idx, XFS_DATA_FORK);
		xfs_bmbt_set_blockcount(ep,
			PREV.br_blockcount - new->br_blockcount);
		XFS_BMAP_TRACE_POST_UPDATE("RF", ip, idx, XFS_DATA_FORK);
		XFS_BMAP_TRACE_INSERT("RF", ip, idx + 1, 1, new, NULL,
			XFS_DATA_FORK);
		xfs_iext_insert(ifp, idx + 1, 1, new);
		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;
			XFS_WANT_CORRUPTED_GOTO(i == 1, done);
			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;
			XFS_WANT_CORRUPTED_GOTO(i == 0, done);
			cur->bc_rec.b.br_state = XFS_EXT_NORM;
			if ((error = xfs_btree_insert(cur, &i)))
				goto done;
			XFS_WANT_CORRUPTED_GOTO(i == 1, done);
		}
		/* DELTA: One in-core extent is split in two. */
		temp = PREV.br_startoff;
		temp2 = PREV.br_blockcount;
		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("0", ip, idx, XFS_DATA_FORK);
		xfs_bmbt_set_blockcount(ep,
			new->br_startoff - PREV.br_startoff);
		XFS_BMAP_TRACE_POST_UPDATE("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("0", ip, idx + 1, 2, &r[0], &r[1],
			XFS_DATA_FORK);
		xfs_iext_insert(ifp, idx + 1, 2, &r[0]);
		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;
			XFS_WANT_CORRUPTED_GOTO(i == 1, done);
			/* 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 */
			cur->bc_rec.b = PREV;
			cur->bc_rec.b.br_blockcount =
				new->br_startoff - PREV.br_startoff;
			if ((error = xfs_btree_insert(cur, &i)))
				goto done;
			XFS_WANT_CORRUPTED_GOTO(i == 1, done);
			/*
			 * Reset the cursor to the position of the new extent
			 * we are about to insert as we can't trust it after
			 * the previous insert.
			 */
			if ((error = xfs_bmbt_lookup_eq(cur, new->br_startoff,
					new->br_startblock, new->br_blockcount,
					&i)))
				goto done;
			XFS_WANT_CORRUPTED_GOTO(i == 0, done);
			/* new middle extent - newext */
			cur->bc_rec.b.br_state = new->br_state;
			if ((error = xfs_btree_insert(cur, &i)))
				goto done;
			XFS_WANT_CORRUPTED_GOTO(i == 1, done);
		}
		/* DELTA: One in-core extent is split in three. */
		temp = PREV.br_startoff;
		temp2 = PREV.br_blockcount;
		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;
	if (delta) {
		temp2 += temp;
		if (delta->xed_startoff > temp)
			delta->xed_startoff = temp;
		if (delta->xed_blockcount < temp2)
			delta->xed_blockcount = temp2;
	}
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_bmbt_irec_t		*new,	/* new data to add to file extents */
	int			*logflagsp, /* inode logging flags */
	xfs_extdelta_t		*delta, /* Change made to incore extents */
	int			rsvd)		/* OK to allocate reserved blocks */
{
	xfs_bmbt_rec_host_t	*ep;	/* extent record for idx */
	xfs_ifork_t		*ifp;	/* inode fork pointer */
	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=0;	/* temp for indirect calculations */
	xfs_filblks_t		temp2=0;
	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, XFS_DATA_FORK);
	ep = xfs_iext_get_ext(ifp, 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(xfs_iext_get_ext(ifp, idx - 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 record.
		 */
		temp = left.br_blockcount + new->br_blockcount +
			right.br_blockcount;
		XFS_BMAP_TRACE_PRE_UPDATE("LC|RC", ip, idx - 1,
			XFS_DATA_FORK);
		xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 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(xfs_iext_get_ext(ifp, idx - 1),
			nullstartblock((int)newlen));
		XFS_BMAP_TRACE_POST_UPDATE("LC|RC", ip, idx - 1,
			XFS_DATA_FORK);
		XFS_BMAP_TRACE_DELETE("LC|RC", ip, idx, 1, XFS_DATA_FORK);
		xfs_iext_remove(ifp, idx, 1);
		ip->i_df.if_lastex = idx - 1;
		/* DELTA: Two in-core extents were replaced by one. */
		temp2 = temp;
		temp = left.br_startoff;
		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("LC", ip, idx - 1,
			XFS_DATA_FORK);
		xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1), temp);
		oldlen = startblockval(left.br_startblock) +
			startblockval(new->br_startblock);
		newlen = xfs_bmap_worst_indlen(ip, temp);
		xfs_bmbt_set_startblock(xfs_iext_get_ext(ifp, idx - 1),
			nullstartblock((int)newlen));
		XFS_BMAP_TRACE_POST_UPDATE("LC", ip, idx - 1,
			XFS_DATA_FORK);
		ip->i_df.if_lastex = idx - 1;
		/* DELTA: One in-core extent grew into a hole. */
		temp2 = temp;
		temp = left.br_startoff;
		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("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("RC", ip, idx, XFS_DATA_FORK);
		ip->i_df.if_lastex = idx;
		/* DELTA: One in-core extent grew into a hole. */
		temp2 = temp;
		temp = new->br_startoff;
		break;

	case 0:
		/*
		 * New allocation is not contiguous with another
		 * delayed allocation.
		 * Insert a new entry.
		 */
		oldlen = newlen = 0;
		XFS_BMAP_TRACE_INSERT("0", ip, idx, 1, new, NULL,
			XFS_DATA_FORK);
		xfs_iext_insert(ifp, idx, 1, new);
		ip->i_df.if_lastex = idx;
		/* DELTA: A new in-core extent was added in a hole. */
		temp2 = new->br_blockcount;
		temp = new->br_startoff;
		break;
	}
	if (oldlen != newlen) {
		ASSERT(oldlen > newlen);
		xfs_mod_incore_sb(ip->i_mount, XFS_SBS_FDBLOCKS,
			(int64_t)(oldlen - newlen), rsvd);
		/*
		 * Nothing to do for disk quota accounting here.
		 */
	}
	if (delta) {
		temp2 += temp;
		if (delta->xed_startoff > temp)
			delta->xed_startoff = temp;
		if (delta->xed_blockcount < temp2)
			delta->xed_blockcount = temp2;
	}
	*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 add to file extents */
	int			*logflagsp, /* inode logging flags */
	xfs_extdelta_t		*delta, /* Change made to incore extents */
	int			whichfork) /* data or attr fork */
{
	xfs_bmbt_rec_host_t	*ep;	/* pointer to extent entry ins. point */
	int			error;	/* error return value */
	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			rval=0;	/* return value (logging flags) */
	int			state;	/* state bits, accessed thru macros */
	xfs_filblks_t		temp=0;
	xfs_filblks_t		temp2=0;
	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 = xfs_iext_get_ext(ifp, 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(xfs_iext_get_ext(ifp, idx - 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));

	error = 0;
	/*
	 * 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 record.
		 */
		XFS_BMAP_TRACE_PRE_UPDATE("LC|RC", ip, idx - 1,
			whichfork);
		xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
			left.br_blockcount + new->br_blockcount +
			right.br_blockcount);
		XFS_BMAP_TRACE_POST_UPDATE("LC|RC", ip, idx - 1,
			whichfork);
		XFS_BMAP_TRACE_DELETE("LC|RC", ip, idx, 1, whichfork);
		xfs_iext_remove(ifp, idx, 1);
		ifp->if_lastex = idx - 1;
		XFS_IFORK_NEXT_SET(ip, whichfork,
			XFS_IFORK_NEXTENTS(ip, whichfork) - 1);
		if (cur == NULL) {
			rval = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
		} else {
			rval = XFS_ILOG_CORE;
			if ((error = xfs_bmbt_lookup_eq(cur,
					right.br_startoff,
					right.br_startblock,
					right.br_blockcount, &i)))
				goto done;
			XFS_WANT_CORRUPTED_GOTO(i == 1, done);
			if ((error = xfs_btree_delete(cur, &i)))
				goto done;
			XFS_WANT_CORRUPTED_GOTO(i == 1, done);
			if ((error = xfs_btree_decrement(cur, 0, &i)))
				goto done;
			XFS_WANT_CORRUPTED_GOTO(i == 1, done);
			if ((error = xfs_bmbt_update(cur, left.br_startoff,
					left.br_startblock,
					left.br_blockcount +
						new->br_blockcount +
						right.br_blockcount,
					left.br_state)))
				goto done;
		}
		/* DELTA: Two in-core extents were replaced by one. */
		temp = left.br_startoff;
		temp2 = left.br_blockcount +
			new->br_blockcount +
			right.br_blockcount;
		break;

	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("LC", ip, idx - 1, whichfork);
		xfs_bmbt_set_blockcount(xfs_iext_get_ext(ifp, idx - 1),
			left.br_blockcount + new->br_blockcount);
		XFS_BMAP_TRACE_POST_UPDATE("LC", ip, idx - 1, whichfork);
		ifp->if_lastex = idx - 1;
		if (cur == NULL) {
			rval = xfs_ilog_fext(whichfork);
		} else {
			rval = 0;
			if ((error = xfs_bmbt_lookup_eq(cur,
					left.br_startoff,
					left.br_startblock,
					left.br_blockcount, &i)))
				goto done;
			XFS_WANT_CORRUPTED_GOTO(i == 1, done);
			if ((error = xfs_bmbt_update(cur, left.br_startoff,
					left.br_startblock,
					left.br_blockcount +
						new->br_blockcount,
					left.br_state)))
				goto done;
		}
		/* DELTA: One in-core extent grew. */
		temp = left.br_startoff;
		temp2 = left.br_blockcount +
			new->br_blockcount;
		break;

	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("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("RC", ip, idx, whichfork);
		ifp->if_lastex = idx;
		if (cur == NULL) {
			rval = xfs_ilog_fext(whichfork);
		} else {
			rval = 0;
			if ((error = xfs_bmbt_lookup_eq(cur,
					right.br_startoff,
					right.br_startblock,
					right.br_blockcount, &i)))
				goto done;
			XFS_WANT_CORRUPTED_GOTO(i == 1, done);
			if ((error = xfs_bmbt_update(cur, new->br_startoff,
					new->br_startblock,
					new->br_blockcount +
						right.br_blockcount,
					right.br_state)))
				goto done;
		}
		/* DELTA: One in-core extent grew. */
		temp = new->br_startoff;
		temp2 = new->br_blockcount +
			right.br_blockcount;
		break;

	case 0:
		/*
		 * New allocation is not contiguous with another
		 * real allocation.
		 * Insert a new entry.
		 */
		XFS_BMAP_TRACE_INSERT("0", ip, idx, 1, new, NULL, whichfork);
		xfs_iext_insert(ifp, idx, 1, new);
		ifp->if_lastex = idx;
		XFS_IFORK_NEXT_SET(ip, whichfork,
			XFS_IFORK_NEXTENTS(ip, whichfork) + 1);
		if (cur == NULL) {
			rval = XFS_ILOG_CORE | xfs_ilog_fext(whichfork);
		} else {
			rval = XFS_ILOG_CORE;
			if ((error = xfs_bmbt_lookup_eq(cur,
					new->br_startoff,
					new->br_startblock,
					new->br_blockcount, &i)))
				goto done;
			XFS_WANT_CORRUPTED_GOTO(i == 0, done);
			cur->bc_rec.b.br_state = new->br_state;
			if ((error = xfs_btree_insert(cur, &i)))
				goto done;
			XFS_WANT_CORRUPTED_GOTO(i == 1, done);
		}
		/* DELTA: A new extent was added in a hole. */
		temp = new->br_startoff;
		temp2 = new->br_blockcount;
		break;
	}
	if (delta) {
		temp2 += temp;
		if (delta->xed_startoff > temp)
			delta->xed_startoff = temp;
		if (delta->xed_blockcount < temp2)
			delta->xed_blockcount = temp2;
	}
done:
	*logflagsp = rval;
	return error;
#undef	MASK
#undef	MASK2
#undef	STATE_SET
#undef	STATE_TEST
#undef	STATE_SET_TEST
#undef	SWITCH_STATE
}

/*
 * Adjust the size of the new extent based on di_extsize and rt extsize.
 */
STATIC int
xfs_bmap_extsize_align(
	xfs_mount_t	*mp,
	xfs_bmbt_irec_t	*gotp,		/* next extent pointer */
	xfs_bmbt_irec_t	*prevp,		/* previous extent pointer */
	xfs_extlen_t	extsz,		/* align to this extent size */
	int		rt,		/* is this a realtime inode? */
	int		eof,		/* is extent at end-of-file? */
	int		delay,		/* creating delalloc extent? */
	int		convert,	/* overwriting unwritten extent? */
	xfs_fileoff_t	*offp,		/* in/out: aligned offset */
	xfs_extlen_t	*lenp)		/* in/out: aligned length */
{
	xfs_fileoff_t	orig_off;	/* original offset */
	xfs_extlen_t	orig_alen;	/* original length */
	xfs_fileoff_t	orig_end;	/* original off+len */
	xfs_fileoff_t	nexto;		/* next file offset */
	xfs_fileoff_t	prevo;		/* previous file offset */
	xfs_fileoff_t	align_off;	/* temp for offset */
	xfs_extlen_t	align_alen;	/* temp for length */
	xfs_extlen_t	temp;		/* temp for calculations */

	if (convert)
		return 0;

	orig_off = align_off = *offp;
	orig_alen = align_alen = *lenp;
	orig_end = orig_off + orig_alen;

	/*
	 * If this request overlaps an existing extent, then don't
	 * attempt to perform any additional alignment.
	 */
	if (!delay && !eof &&
	    (orig_off >= gotp->br_startoff) &&
	    (orig_end <= gotp->br_startoff + gotp->br_blockcount)) {
		return 0;
	}

	/*
	 * 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, or if a truncate shot us in the
	 * foot.
	 */
	temp = do_mod(orig_off, extsz);
	if (temp) {
		align_alen += temp;
		align_off -= temp;
	}
	/*
	 * Same adjustment for the end of the requested area.
	 */
	if ((temp = (align_alen % extsz))) {
		align_alen += extsz - temp;
	}
	/*
	 * If the previous block overlaps with this proposed allocation
	 * then move the start forward without adjusting the length.
	 */
	if (prevp->br_startoff != NULLFILEOFF) {
		if (prevp->br_startblock == HOLESTARTBLOCK)
			prevo = prevp->br_startoff;
		else
			prevo = prevp->br_startoff + prevp->br_blockcount;
	} else
		prevo = 0;
	if (align_off != orig_off && align_off < prevo)
		align_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.
	 */
	if (!eof && gotp->br_startoff != NULLFILEOFF) {
		if ((delay && gotp->br_startblock == HOLESTARTBLOCK) ||
		    (!delay && gotp->br_startblock == DELAYSTARTBLOCK))
			nexto = gotp->br_startoff + gotp->br_blockcount;
		else
			nexto = gotp->br_startoff;
	} else
		nexto = NULLFILEOFF;
	if (!eof &&
	    align_off + align_alen != orig_end &&
	    align_off + align_alen > nexto)
		align_off = nexto > align_alen ? nexto - align_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 (align_off != orig_off && align_off < prevo)
		align_off = prevo;
	if (align_off + align_alen != orig_end &&
	    align_off + align_alen > nexto &&
	    nexto != NULLFILEOFF) {
		ASSERT(nexto > prevo);
		align_alen = nexto - align_off;
	}

	/*
	 * If realtime, and the result isn't a multiple of the realtime
	 * extent size we need to remove blocks until it is.
	 */
	if (rt && (temp = (align_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 < align_off ||
		    orig_end > align_off + align_alen ||
		    align_alen - temp < orig_alen)
			return XFS_ERROR(EINVAL);
		/*
		 * Try to fix it by moving the start up.
		 */
		if (align_off + temp <= orig_off) {
			align_alen -= temp;
			align_off += temp;
		}
		/*
		 * Try to fix it by moving the end in.
		 */
		else if (align_off + align_alen - temp >= orig_end)
			align_alen -= temp;
		/*
		 * Set the start to the minimum then trim the length.
		 */
		else {
			align_alen -= orig_off - align_off;
			align_off = orig_off;
			align_alen -= align_alen % mp->m_sb.sb_rextsize;
		}
		/*
		 * Result doesn't cover the request, fail it.
		 */
		if (orig_off < align_off || orig_end > align_off + align_alen)
			return XFS_ERROR(EINVAL);
	} else {
		ASSERT(orig_off >= align_off);
		ASSERT(orig_end <= align_off + align_alen);
	}

#ifdef DEBUG
	if (!eof && gotp->br_startoff != NULLFILEOFF)
		ASSERT(align_off + align_alen <= gotp->br_startoff);
	if (prevp->br_startoff != NULLFILEOFF)
		ASSERT(align_off >= prevp->br_startoff + prevp->br_blockcount);
#endif

	*lenp = align_alen;
	*offp = align_off;
	return 0;
}

#define XFS_ALLOC_GAP_UNITS	4

STATIC void
xfs_bmap_adjacent(
	xfs_bmalloca_t	*ap)		/* bmap alloc argument struct */
{
	xfs_fsblock_t	adjust;		/* adjustment to block numbers */
	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 */

#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)

	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);
	/*
	 * If allocating at eof, and there's a previous real block,
	 * try to use its 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;
	}
#undef ISVALID
}

STATIC int
xfs_bmap_rtalloc(
	xfs_bmalloca_t	*ap)		/* bmap alloc argument struct */
{
	xfs_alloctype_t	atype = 0;	/* type for allocation routines */
	int		error;		/* error return value */
	xfs_mount_t	*mp;		/* mount point structure */
	xfs_extlen_t	prod = 0;	/* product factor for allocators */
	xfs_extlen_t	ralen = 0;	/* realtime allocation length */
	xfs_extlen_t	align;		/* minimum allocation alignment */
	xfs_rtblock_t	rtb;

	mp = ap->ip->i_mount;
	align = xfs_get_extsz_hint(ap->ip);
	prod = align / mp->m_sb.sb_rextsize;
	error = xfs_bmap_extsize_align(mp, ap->gotp, ap->prevp,
					align, 1, ap->eof, 0,
					ap->conv, &ap->off, &ap->alen);
	if (error)
		return error;
	ASSERT(ap->alen);
	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, align) || ap->alen % align)
		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) {
		xfs_rtblock_t uninitialized_var(rtx); /* realtime extent no */

		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;
	}

	xfs_bmap_adjacent(ap);

	/*
	 * Realtime allocation, done through xfs_rtallocate_extent.
	 */
	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(ap->tp, ap->ip,
			ap->wasdel ? XFS_TRANS_DQ_DELRTBCOUNT :
					XFS_TRANS_DQ_RTBCOUNT, (long) ralen);
	} else {
		ap->alen = 0;
	}
	return 0;
}

STATIC int
xfs_bmap_btalloc(
	xfs_bmalloca_t	*ap)		/* bmap alloc argument struct */
{
	xfs_mount_t	*mp;		/* mount point structure */
	xfs_alloctype_t	atype = 0;	/* type for allocation routines */
	xfs_extlen_t	align;		/* minimum allocation alignment */
	xfs_agnumber_t	ag;
	xfs_agnumber_t	fb_agno;	/* ag number of ap->firstblock */
	xfs_agnumber_t	startag;
	xfs_alloc_arg_t	args;
	xfs_extlen_t	blen;
	xfs_extlen_t	nextminlen = 0;
	xfs_perag_t	*pag;
	int		nullfb;		/* true if ap->firstblock isn't set */
	int		isaligned;
	int		notinit;
	int		tryagain;
	int		error;

	mp = ap->ip->i_mount;
	align = ap->userdata ? xfs_get_extsz_hint(ap->ip) : 0;
	if (unlikely(align)) {
		error = xfs_bmap_extsize_align(mp, ap->gotp, ap->prevp,
						align, 0, ap->eof, 0, ap->conv,
						&ap->off, &ap->alen);
		ASSERT(!error);
		ASSERT(ap->alen);
	}
	nullfb = ap->firstblock == NULLFSBLOCK;
	fb_agno = nullfb ? NULLAGNUMBER : XFS_FSB_TO_AGNO(mp, ap->firstblock);
	if (nullfb) {
		if (ap->userdata && xfs_inode_is_filestream(ap->ip)) {
			ag = xfs_filestream_lookup_ag(ap->ip);
			ag = (ag != NULLAGNUMBER) ? ag : 0;
			ap->rval = XFS_AGB_TO_FSB(mp, ag, 0);
		} else {
			ap->rval = XFS_INO_TO_FSB(mp, ap->ip->i_ino);
		}
	} else
		ap->rval = ap->firstblock;

	xfs_bmap_adjacent(ap);

	/*
	 * If allowed, use ap->rval; otherwise must use firstblock since
	 * it's in the right allocation group.
	 */
	if (nullfb || XFS_FSB_TO_AGNO(mp, ap->rval) == fb_agno)
		;
	else
		ap->rval = ap->firstblock;
	/*
	 * Normal allocation, done through xfs_alloc_vextent.
	 */
	tryagain = isaligned = 0;
	args.tp = ap->tp;
	args.mp = mp;
	args.fsbno = ap->rval;
	args.maxlen = MIN(ap->alen, mp->m_sb.sb_agblocks);
	args.firstblock = ap->firstblock;
	blen = 0;
	if (nullfb) {
		if (ap->userdata && xfs_inode_is_filestream(ap->ip))
			args.type = XFS_ALLOCTYPE_NEAR_BNO;
		else
			args.type = XFS_ALLOCTYPE_START_BNO;
		args.total = ap->total;

		/*
		 * Search for an allocation group with a single extent
		 * large enough for the request.
		 *
		 * If one isn't found, then adjust the minimum allocation
		 * size to the largest space found.
		 */
		startag = ag = XFS_FSB_TO_AGNO(mp, args.fsbno);
		if (startag == NULLAGNUMBER)
			startag = ag = 0;
		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) {
				xfs_extlen_t	longest;
				longest = xfs_alloc_longest_free_extent(mp, pag);
				if (blen < longest)
					blen = longest;
			} else
				notinit = 1;

			if (xfs_inode_is_filestream(ap->ip)) {
				if (blen >= ap->alen)
					break;

				if (ap->userdata) {
					/*
					 * If startag is an invalid AG, we've
					 * come here once before and
					 * xfs_filestream_new_ag picked the
					 * best currently available.
					 *
					 * Don't continue looping, since we
					 * could loop forever.
					 */
					if (startag == NULLAGNUMBER)
						break;

					error = xfs_filestream_new_ag(ap, &ag);
					if (error) {
						up_read(&mp->m_peraglock);
						return error;
					}

					/* loop again to set 'blen'*/
					startag = NULLAGNUMBER;
					continue;
				}
			}
			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;

		/*
		 * set the failure fallback case to look in the selected
		 * AG as the stream may have moved.
		 */
		if (xfs_inode_is_filestream(ap->ip))
			ap->rval = args.fsbno = XFS_AGB_TO_FSB(mp, ag, 0);
	} else if (ap->low) {
		if (xfs_inode_is_filestream(ap->ip))
			args.type = XFS_ALLOCTYPE_FIRST_AG;
		else
			args.type = XFS_ALLOCTYPE_START_BNO;
		args.total = args.minlen = ap->minlen;
	} else {
		args.type = XFS_ALLOCTYPE_NEAR_BNO;
		args.total = ap->total;
		args.minlen = ap->minlen;
	}
	/* apply extent size hints if obtained earlier */
	if (unlikely(align)) {
		args.prod = align;
		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 >= PAGE_CACHE_SIZE) {
		args.prod = 1;
		args.mod = 0;
	} else {
		args.prod = PAGE_CACHE_SIZE >> 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(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;
}

/*
 * 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
xfs_bmap_alloc(
	xfs_bmalloca_t	*ap)		/* bmap alloc argument struct */
{
	if (XFS_IS_REALTIME_INODE(ap->ip) && ap->userdata)
		return xfs_bmap_rtalloc(ap);
	return xfs_bmap_btalloc(ap);
}

/*
 * 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 file extents are 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 */
	struct xfs_btree_block	*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 */
	__be64			*pp;	/* ptr to block address */
	struct xfs_btree_block	*rblock;/* root btree block */

	mp = ip->i_mount;
	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(be16_to_cpu(rblock->bb_level) == 1);
	ASSERT(be16_to_cpu(rblock->bb_numrecs) == 1);
	ASSERT(xfs_bmbt_maxrecs(mp, ifp->if_broot_bytes, 0) == 1);
	pp = XFS_BMAP_BROOT_PTR_ADDR(mp, rblock, 1, ifp->if_broot_bytes);
	cbno = be64_to_cpu(*pp);
	*logflagsp = 0;
#ifdef DEBUG
	if ((error = xfs_btree_check_lptr(cur, cbno, 1)))
		return error;
#endif
	if ((error = xfs_btree_read_bufl(mp, tp, cbno, 0, &cbp,
			XFS_BMAP_BTREE_REF)))
		return error;
	cblock = XFS_BUF_TO_BLOCK(cbp);
	if ((error = xfs_btree_check_block(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(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 file extent records 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 extents */
	int			*logflagsp, /* inode logging flags */
	xfs_extdelta_t		*delta, /* Change made to incore extents */
	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_host_t	*ep;	/* current extent entry pointer */
	int			error;	/* error return value */
	int			flags;	/* inode logging flags */
	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 */
	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);
	ASSERT((idx >= 0) && (idx < ifp->if_bytes /
		(uint)sizeof(xfs_bmbt_rec_t)));
	ASSERT(del->br_blockcount > 0);
	ep = xfs_iext_get_ext(ifp, 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 && XFS_IS_REALTIME_INODE(ip)) {
			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;
			XFS_WANT_CORRUPTED_GOTO(i == 1, done);
		}
		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("3", ip, idx, 1, whichfork);
		xfs_iext_remove(ifp, idx, 1);
		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_btree_delete(cur, &i)))
			goto done;
		XFS_WANT_CORRUPTED_GOTO(i == 1, done);
		break;

	case 2:
		/*
		 * Deleting the first part of the extent.
		 */
		XFS_BMAP_TRACE_PRE_UPDATE("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("2", ip, idx,
				whichfork);
			da_new = temp;
			break;
		}
		xfs_bmbt_set_startblock(ep, del_endblock);
		XFS_BMAP_TRACE_POST_UPDATE("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("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("1", ip, idx,
				whichfork);
			da_new = temp;
			break;
		}
		XFS_BMAP_TRACE_POST_UPDATE("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("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_btree_increment(cur, 0, &i)))
					goto done;
				cur->bc_rec.b = new;
				error = xfs_btree_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;
					XFS_WANT_CORRUPTED_GOTO(i == 1, done);
					/*
					 * 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;
				}
				XFS_WANT_CORRUPTED_GOTO(i == 1, done);
			} 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("0", ip, idx, whichfork);
		XFS_BMAP_TRACE_INSERT("0", ip, idx + 1, 1, &new, NULL,
			whichfork);
		xfs_iext_insert(ifp, idx + 1, 1, &new);
		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(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, (int64_t)(da_old - da_new),
			rsvd);
	if (delta) {
		/* DELTA: report the original extent. */
		if (delta->xed_startoff > got.br_startoff)
			delta->xed_startoff = got.br_startoff;
		if (delta->xed_blockcount < got.br_startoff+got.br_blockcount)
			delta->xed_blockcount = got.br_startoff +
							got.br_blockcount;
	}
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);
}

/*
 * 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 */
{
	struct xfs_btree_block	*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 */
	struct xfs_btree_block	*block;		/* btree root block */
	xfs_btree_cur_t		*cur;		/* bmap btree cursor */
	xfs_bmbt_rec_host_t	*ep;		/* extent record pointer */
	int			error;		/* error return value */
	xfs_extnum_t		i, cnt;		/* extent record 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;	/* number of file extents */
	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;
	block->bb_magic = cpu_to_be32(XFS_BMAP_MAGIC);
	block->bb_level = cpu_to_be16(1);
	block->bb_numrecs = cpu_to_be16(1);
	block->bb_u.l.bb_leftsib = cpu_to_be64(NULLDFSBNO);
	block->bb_u.l.bb_rightsib = cpu_to_be64(NULLDFSBNO);

	/*
	 * Need a cursor.  Can't allocate until bb_level is filled in.
	 */
	mp = ip->i_mount;
	cur = xfs_bmbt_init_cursor(mp, tp, 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;
	args.firstblock = *firstblock;
	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(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_BLOCK(abp);
	ablock->bb_magic = cpu_to_be32(XFS_BMAP_MAGIC);
	ablock->bb_level = 0;
	ablock->bb_u.l.bb_leftsib = cpu_to_be64(NULLDFSBNO);
	ablock->bb_u.l.bb_rightsib = cpu_to_be64(NULLDFSBNO);
	arp = XFS_BMBT_REC_ADDR(mp, ablock, 1);
	nextents = ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t);
	for (cnt = i = 0; i < nextents; i++) {
		ep = xfs_iext_get_ext(ifp, i);
		if (!isnullstartblock(xfs_bmbt_get_startblock(ep))) {
			arp->l0 = cpu_to_be64(ep->l0);
			arp->l1 = cpu_to_be64(ep->l1);
			arp++; cnt++;
		}
	}
	ASSERT(cnt == XFS_IFORK_NEXTENTS(ip, whichfork));
	xfs_btree_set_numrecs(ablock, cnt);

	/*
	 * Fill in the root key and pointer.
	 */
	kp = XFS_BMBT_KEY_ADDR(mp, block, 1);
	arp = XFS_BMBT_REC_ADDR(mp, ablock, 1);
	kp->br_startoff = cpu_to_be64(xfs_bmbt_disk_get_startoff(arp));
	pp = XFS_BMBT_PTR_ADDR(mp, block, 1, xfs_bmbt_get_maxrecs(cur,
						be16_to_cpu(block->bb_level)));
	*pp = cpu_to_be64(args.fsbno);

	/*
	 * Do all this logging at the end so that
	 * the root is at the right level.
	 */
	xfs_btree_log_block(cur, abp, XFS_BB_ALL_BITS);
	xfs_btree_log_recs(cur, abp, 1, be16_to_cpu(ablock->bb_numrecs));
	ASSERT(*curp == NULL);
	*curp = cur;
	*logflagsp = XFS_ILOG_CORE | xfs_ilog_fbroot(whichfork);
	return 0;
}

/*
 * Calculate the default attribute fork offset for newly created inodes.
 */
uint
xfs_default_attroffset(
	struct xfs_inode	*ip)
{
	struct xfs_mount	*mp = ip->i_mount;
	uint			offset;

	if (mp->m_sb.sb_inodesize == 256) {
		offset = XFS_LITINO(mp) -
				XFS_BMDR_SPACE_CALC(MINABTPTRS);
	} else {
		offset = XFS_BMDR_SPACE_CALC(6 * MINABTPTRS);
	}

	ASSERT(offset < XFS_LITINO(mp));
	return offset;
}

/*
 * Helper routine to reset inode di_forkoff field when switching
 * attribute fork from local to extent format - we reset it where
 * possible to make space available for inline data fork extents.
 */
STATIC void
xfs_bmap_forkoff_reset(
	xfs_mount_t	*mp,
	xfs_inode_t	*ip,
	int		whichfork)
{
	if (whichfork == XFS_ATTR_FORK &&
	    ip->i_d.di_format != XFS_DINODE_FMT_DEV &&
	    ip->i_d.di_format != XFS_DINODE_FMT_UUID &&
	    ip->i_d.di_format != XFS_DINODE_FMT_BTREE) {
		uint	dfl_forkoff = xfs_default_attroffset(ip) >> 3;

		if (dfl_forkoff > ip->i_d.di_forkoff) {
			ip->i_d.di_forkoff = dfl_forkoff;
			ip->i_df.if_ext_max =
				XFS_IFORK_DSIZE(ip) / sizeof(xfs_bmbt_rec_t);
			ip->i_afp->if_ext_max =
				XFS_IFORK_ASIZE(ip) / sizeof(xfs_bmbt_rec_t);
		}
	}
}

/*
 * 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 */
	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 block */
		xfs_bmbt_rec_host_t *ep;/* extent record pointer */

		args.tp = tp;
		args.mp = ip->i_mount;
		args.firstblock = *firstblock;
		ASSERT((ifp->if_flags &
			(XFS_IFINLINE|XFS_IFEXTENTS|XFS_IFEXTIREC)) == 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_bmap_forkoff_reset(args.mp, ip, whichfork);
		xfs_idata_realloc(ip, -ifp->if_bytes, whichfork);