/*

   * Copyright (c) 2000-2003,2005 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_log.h"

  #include "xfs_inum.h"

  #include "xfs_trans.h"
  #include "xfs_sb.h"

  #include "xfs_ag.h"

  #include "xfs_dir2.h"
  #include "xfs_dmapi.h"
  #include "xfs_mount.h"

  #include "xfs_da_btree.h"

  #include "xfs_bmap_btree.h"

  #include "xfs_dir2_sf.h"

  #include "xfs_attr_sf.h"

  #include "xfs_dinode.h"

  #include "xfs_inode.h"

  #include "xfs_inode_item.h"

  #include "xfs_dir2_data.h"
  #include "xfs_dir2_leaf.h"
  #include "xfs_dir2_block.h"
  #include "xfs_dir2_trace.h"
  #include "xfs_error.h"
  
  /*
   * Local function prototypes.
   */
  static void xfs_dir2_block_log_leaf(xfs_trans_t *tp, xfs_dabuf_t *bp, int first,
  				    int last);
  static void xfs_dir2_block_log_tail(xfs_trans_t *tp, xfs_dabuf_t *bp);
  static int xfs_dir2_block_lookup_int(xfs_da_args_t *args, xfs_dabuf_t **bpp,
  				     int *entno);
  static int xfs_dir2_block_sort(const void *a, const void *b);

  static xfs_dahash_t xfs_dir_hash_dot, xfs_dir_hash_dotdot;
  
  /*
   * One-time startup routine called from xfs_init().
   */
  void
  xfs_dir_startup(void)
  {
  	xfs_dir_hash_dot = xfs_da_hashname(".", 1);
  	xfs_dir_hash_dotdot = xfs_da_hashname("..", 2);
  }

  /*
   * Add an entry to a block directory.
   */
  int						/* error */
  xfs_dir2_block_addname(
  	xfs_da_args_t		*args)		/* directory op arguments */
  {
  	xfs_dir2_data_free_t	*bf;		/* bestfree table in block */
  	xfs_dir2_block_t	*block;		/* directory block structure */
  	xfs_dir2_leaf_entry_t	*blp;		/* block leaf entries */
  	xfs_dabuf_t		*bp;		/* buffer for block */
  	xfs_dir2_block_tail_t	*btp;		/* block tail */
  	int			compact;	/* need to compact leaf ents */
  	xfs_dir2_data_entry_t	*dep;		/* block data entry */
  	xfs_inode_t		*dp;		/* directory inode */
  	xfs_dir2_data_unused_t	*dup;		/* block unused entry */
  	int			error;		/* error return value */
  	xfs_dir2_data_unused_t	*enddup=NULL;	/* unused at end of data */
  	xfs_dahash_t		hash;		/* hash value of found entry */
  	int			high;		/* high index for binary srch */
  	int			highstale;	/* high stale index */
  	int			lfloghigh=0;	/* last final leaf to log */
  	int			lfloglow=0;	/* first final leaf to log */
  	int			len;		/* length of the new entry */
  	int			low;		/* low index for binary srch */
  	int			lowstale;	/* low stale index */
  	int			mid=0;		/* midpoint for binary srch */
  	xfs_mount_t		*mp;		/* filesystem mount point */
  	int			needlog;	/* need to log header */
  	int			needscan;	/* need to rescan freespace */

  	__be16			*tagp;		/* pointer to tag value */

  	xfs_trans_t		*tp;		/* transaction structure */
  
  	xfs_dir2_trace_args("block_addname", args);
  	dp = args->dp;
  	tp = args->trans;
  	mp = dp->i_mount;
  	/*
  	 * Read the (one and only) directory block into dabuf bp.
  	 */
  	if ((error =
  	    xfs_da_read_buf(tp, dp, mp->m_dirdatablk, -1, &bp, XFS_DATA_FORK))) {
  		return error;
  	}
  	ASSERT(bp != NULL);
  	block = bp->data;
  	/*
  	 * Check the magic number, corrupted if wrong.
  	 */

  	if (unlikely(be32_to_cpu(block->hdr.magic) != XFS_DIR2_BLOCK_MAGIC)) {

  		XFS_CORRUPTION_ERROR("xfs_dir2_block_addname",
  				     XFS_ERRLEVEL_LOW, mp, block);
  		xfs_da_brelse(tp, bp);
  		return XFS_ERROR(EFSCORRUPTED);
  	}

  	len = xfs_dir2_data_entsize(args->namelen);

  	/*
  	 * Set up pointers to parts of the block.
  	 */
  	bf = block->hdr.bestfree;

  	btp = xfs_dir2_block_tail_p(mp, block);
  	blp = xfs_dir2_block_leaf_p(btp);

  	/*
  	 * No stale entries?  Need space for entry and new leaf.
  	 */
  	if (!btp->stale) {
  		/*
  		 * Tag just before the first leaf entry.
  		 */

  		tagp = (__be16 *)blp - 1;

  		/*
  		 * Data object just before the first leaf entry.
  		 */

  		enddup = (xfs_dir2_data_unused_t *)((char *)block + be16_to_cpu(*tagp));

  		/*
  		 * If it's not free then can't do this add without cleaning up:
  		 * the space before the first leaf entry needs to be free so it
  		 * can be expanded to hold the pointer to the new entry.
  		 */

  		if (be16_to_cpu(enddup->freetag) != XFS_DIR2_DATA_FREE_TAG)

  			dup = enddup = NULL;
  		/*
  		 * Check out the biggest freespace and see if it's the same one.
  		 */
  		else {
  			dup = (xfs_dir2_data_unused_t *)

  			      ((char *)block + be16_to_cpu(bf[0].offset));

  			if (dup == enddup) {
  				/*
  				 * It is the biggest freespace, is it too small
  				 * to hold the new leaf too?
  				 */

  				if (be16_to_cpu(dup->length) < len + (uint)sizeof(*blp)) {

  					/*
  					 * Yes, we use the second-largest
  					 * entry instead if it works.
  					 */

  					if (be16_to_cpu(bf[1].length) >= len)

  						dup = (xfs_dir2_data_unused_t *)
  						      ((char *)block +

  						       be16_to_cpu(bf[1].offset));

  					else
  						dup = NULL;
  				}
  			} else {
  				/*
  				 * Not the same free entry,
  				 * just check its length.
  				 */

  				if (be16_to_cpu(dup->length) < len) {

  					dup = NULL;
  				}
  			}
  		}
  		compact = 0;
  	}
  	/*
  	 * If there are stale entries we'll use one for the leaf.
  	 * Is the biggest entry enough to avoid compaction?
  	 */

  	else if (be16_to_cpu(bf[0].length) >= len) {

  		dup = (xfs_dir2_data_unused_t *)

  		      ((char *)block + be16_to_cpu(bf[0].offset));

  		compact = 0;
  	}
  	/*
  	 * Will need to compact to make this work.
  	 */
  	else {
  		/*
  		 * Tag just before the first leaf entry.
  		 */

  		tagp = (__be16 *)blp - 1;

  		/*
  		 * Data object just before the first leaf entry.
  		 */

  		dup = (xfs_dir2_data_unused_t *)((char *)block + be16_to_cpu(*tagp));

  		/*
  		 * If it's not free then the data will go where the
  		 * leaf data starts now, if it works at all.
  		 */

  		if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {

  			if (be16_to_cpu(dup->length) + (be32_to_cpu(btp->stale) - 1) *

  			    (uint)sizeof(*blp) < len)
  				dup = NULL;

  		} else if ((be32_to_cpu(btp->stale) - 1) * (uint)sizeof(*blp) < len)

  			dup = NULL;
  		else
  			dup = (xfs_dir2_data_unused_t *)blp;
  		compact = 1;
  	}
  	/*
  	 * If this isn't a real add, we're done with the buffer.
  	 */

  	if (args->op_flags & XFS_DA_OP_JUSTCHECK)

  		xfs_da_brelse(tp, bp);
  	/*
  	 * If we don't have space for the new entry & leaf ...
  	 */
  	if (!dup) {
  		/*
  		 * Not trying to actually do anything, or don't have
  		 * a space reservation: return no-space.
  		 */

  		if ((args->op_flags & XFS_DA_OP_JUSTCHECK) || args->total == 0)

  			return XFS_ERROR(ENOSPC);
  		/*
  		 * Convert to the next larger format.
  		 * Then add the new entry in that format.
  		 */
  		error = xfs_dir2_block_to_leaf(args, bp);
  		xfs_da_buf_done(bp);
  		if (error)
  			return error;
  		return xfs_dir2_leaf_addname(args);
  	}
  	/*
  	 * Just checking, and it would work, so say so.
  	 */

  	if (args->op_flags & XFS_DA_OP_JUSTCHECK)

  		return 0;
  	needlog = needscan = 0;
  	/*
  	 * If need to compact the leaf entries, do it now.
  	 * Leave the highest-numbered stale entry stale.
  	 * XXX should be the one closest to mid but mid is not yet computed.
  	 */
  	if (compact) {
  		int	fromidx;		/* source leaf index */
  		int	toidx;			/* target leaf index */

  		for (fromidx = toidx = be32_to_cpu(btp->count) - 1,

  			highstale = lfloghigh = -1;
  		     fromidx >= 0;
  		     fromidx--) {

  			if (be32_to_cpu(blp[fromidx].address) == XFS_DIR2_NULL_DATAPTR) {

  				if (highstale == -1)
  					highstale = toidx;
  				else {
  					if (lfloghigh == -1)
  						lfloghigh = toidx;
  					continue;
  				}
  			}
  			if (fromidx < toidx)
  				blp[toidx] = blp[fromidx];
  			toidx--;
  		}

  		lfloglow = toidx + 1 - (be32_to_cpu(btp->stale) - 1);
  		lfloghigh -= be32_to_cpu(btp->stale) - 1;

  		be32_add_cpu(&btp->count, -(be32_to_cpu(btp->stale) - 1));

  		xfs_dir2_data_make_free(tp, bp,
  			(xfs_dir2_data_aoff_t)((char *)blp - (char *)block),

  			(xfs_dir2_data_aoff_t)((be32_to_cpu(btp->stale) - 1) * sizeof(*blp)),

  			&needlog, &needscan);

  		blp += be32_to_cpu(btp->stale) - 1;
  		btp->stale = cpu_to_be32(1);

  		/*
  		 * If we now need to rebuild the bestfree map, do so.
  		 * This needs to happen before the next call to use_free.
  		 */
  		if (needscan) {

  			xfs_dir2_data_freescan(mp, (xfs_dir2_data_t *)block, &needlog);

  			needscan = 0;
  		}
  	}
  	/*
  	 * Set leaf logging boundaries to impossible state.
  	 * For the no-stale case they're set explicitly.
  	 */

  	else if (btp->stale) {
  		lfloglow = be32_to_cpu(btp->count);

  		lfloghigh = -1;
  	}
  	/*
  	 * Find the slot that's first lower than our hash value, -1 if none.
  	 */

  	for (low = 0, high = be32_to_cpu(btp->count) - 1; low <= high; ) {

  		mid = (low + high) >> 1;

  		if ((hash = be32_to_cpu(blp[mid].hashval)) == args->hashval)

  			break;
  		if (hash < args->hashval)
  			low = mid + 1;
  		else
  			high = mid - 1;
  	}

  	while (mid >= 0 && be32_to_cpu(blp[mid].hashval) >= args->hashval) {

  		mid--;
  	}
  	/*
  	 * No stale entries, will use enddup space to hold new leaf.
  	 */
  	if (!btp->stale) {
  		/*
  		 * Mark the space needed for the new leaf entry, now in use.
  		 */
  		xfs_dir2_data_use_free(tp, bp, enddup,
  			(xfs_dir2_data_aoff_t)

  			((char *)enddup - (char *)block + be16_to_cpu(enddup->length) -

  			 sizeof(*blp)),
  			(xfs_dir2_data_aoff_t)sizeof(*blp),
  			&needlog, &needscan);
  		/*
  		 * Update the tail (entry count).
  		 */

  		be32_add_cpu(&btp->count, 1);

  		/*
  		 * If we now need to rebuild the bestfree map, do so.
  		 * This needs to happen before the next call to use_free.
  		 */
  		if (needscan) {
  			xfs_dir2_data_freescan(mp, (xfs_dir2_data_t *)block,

  				&needlog);

  			needscan = 0;
  		}
  		/*
  		 * Adjust pointer to the first leaf entry, we're about to move
  		 * the table up one to open up space for the new leaf entry.
  		 * Then adjust our index to match.
  		 */
  		blp--;
  		mid++;
  		if (mid)
  			memmove(blp, &blp[1], mid * sizeof(*blp));
  		lfloglow = 0;
  		lfloghigh = mid;
  	}
  	/*
  	 * Use a stale leaf for our new entry.
  	 */
  	else {
  		for (lowstale = mid;
  		     lowstale >= 0 &&

  			be32_to_cpu(blp[lowstale].address) != XFS_DIR2_NULL_DATAPTR;

  		     lowstale--)
  			continue;
  		for (highstale = mid + 1;

  		     highstale < be32_to_cpu(btp->count) &&

  			be32_to_cpu(blp[highstale].address) != XFS_DIR2_NULL_DATAPTR &&

  			(lowstale < 0 || mid - lowstale > highstale - mid);
  		     highstale++)
  			continue;
  		/*
  		 * Move entries toward the low-numbered stale entry.
  		 */
  		if (lowstale >= 0 &&

  		    (highstale == be32_to_cpu(btp->count) ||

  		     mid - lowstale <= highstale - mid)) {
  			if (mid - lowstale)
  				memmove(&blp[lowstale], &blp[lowstale + 1],
  					(mid - lowstale) * sizeof(*blp));
  			lfloglow = MIN(lowstale, lfloglow);
  			lfloghigh = MAX(mid, lfloghigh);
  		}
  		/*
  		 * Move entries toward the high-numbered stale entry.
  		 */
  		else {

  			ASSERT(highstale < be32_to_cpu(btp->count));

  			mid++;
  			if (highstale - mid)
  				memmove(&blp[mid + 1], &blp[mid],
  					(highstale - mid) * sizeof(*blp));
  			lfloglow = MIN(mid, lfloglow);
  			lfloghigh = MAX(highstale, lfloghigh);
  		}

  		be32_add_cpu(&btp->stale, -1);

  	}
  	/*
  	 * Point to the new data entry.
  	 */
  	dep = (xfs_dir2_data_entry_t *)dup;
  	/*
  	 * Fill in the leaf entry.
  	 */

  	blp[mid].hashval = cpu_to_be32(args->hashval);

  	blp[mid].address = cpu_to_be32(xfs_dir2_byte_to_dataptr(mp,

  				(char *)dep - (char *)block));

  	xfs_dir2_block_log_leaf(tp, bp, lfloglow, lfloghigh);
  	/*
  	 * Mark space for the data entry used.
  	 */
  	xfs_dir2_data_use_free(tp, bp, dup,
  		(xfs_dir2_data_aoff_t)((char *)dup - (char *)block),
  		(xfs_dir2_data_aoff_t)len, &needlog, &needscan);
  	/*
  	 * Create the new data entry.
  	 */

  	dep->inumber = cpu_to_be64(args->inumber);

  	dep->namelen = args->namelen;
  	memcpy(dep->name, args->name, args->namelen);

  	tagp = xfs_dir2_data_entry_tag_p(dep);

  	*tagp = cpu_to_be16((char *)dep - (char *)block);

  	/*
  	 * Clean up the bestfree array and log the header, tail, and entry.
  	 */
  	if (needscan)

  		xfs_dir2_data_freescan(mp, (xfs_dir2_data_t *)block, &needlog);

  	if (needlog)
  		xfs_dir2_data_log_header(tp, bp);
  	xfs_dir2_block_log_tail(tp, bp);
  	xfs_dir2_data_log_entry(tp, bp, dep);
  	xfs_dir2_data_check(dp, bp);
  	xfs_da_buf_done(bp);
  	return 0;
  }
  
  /*
   * Readdir for block directories.
   */
  int						/* error */
  xfs_dir2_block_getdents(

  	xfs_inode_t		*dp,		/* incore inode */

  	void			*dirent,
  	xfs_off_t		*offset,
  	filldir_t		filldir)

  {
  	xfs_dir2_block_t	*block;		/* directory block structure */
  	xfs_dabuf_t		*bp;		/* buffer for block */
  	xfs_dir2_block_tail_t	*btp;		/* block tail */
  	xfs_dir2_data_entry_t	*dep;		/* block data entry */
  	xfs_dir2_data_unused_t	*dup;		/* block unused entry */
  	char			*endptr;	/* end of the data entries */
  	int			error;		/* error return value */
  	xfs_mount_t		*mp;		/* filesystem mount point */

  	char			*ptr;		/* current data entry */
  	int			wantoff;	/* starting block offset */

  	xfs_ino_t		ino;
  	xfs_off_t		cook;

  
  	mp = dp->i_mount;
  	/*
  	 * If the block number in the offset is out of range, we're done.
  	 */

  	if (xfs_dir2_dataptr_to_db(mp, *offset) > mp->m_dirdatablk) {

  		return 0;
  	}
  	/*
  	 * Can't read the block, give up, else get dabuf in bp.
  	 */

  	error = xfs_da_read_buf(NULL, dp, mp->m_dirdatablk, -1,
  				&bp, XFS_DATA_FORK);
  	if (error)

  		return error;

  	ASSERT(bp != NULL);
  	/*
  	 * Extract the byte offset we start at from the seek pointer.
  	 * We'll skip entries before this.
  	 */

  	wantoff = xfs_dir2_dataptr_to_off(mp, *offset);

  	block = bp->data;
  	xfs_dir2_data_check(dp, bp);
  	/*
  	 * Set up values for the loop.
  	 */

  	btp = xfs_dir2_block_tail_p(mp, block);

  	ptr = (char *)block->u;

  	endptr = (char *)xfs_dir2_block_leaf_p(btp);

  	/*
  	 * Loop over the data portion of the block.
  	 * Each object is a real entry (dep) or an unused one (dup).
  	 */
  	while (ptr < endptr) {
  		dup = (xfs_dir2_data_unused_t *)ptr;
  		/*
  		 * Unused, skip it.
  		 */

  		if (be16_to_cpu(dup->freetag) == XFS_DIR2_DATA_FREE_TAG) {
  			ptr += be16_to_cpu(dup->length);

  			continue;
  		}
  
  		dep = (xfs_dir2_data_entry_t *)ptr;
  
  		/*
  		 * Bump pointer for the next iteration.
  		 */

  		ptr += xfs_dir2_data_entsize(dep->namelen);

  		/*
  		 * The entry is before the desired starting point, skip it.
  		 */
  		if ((char *)dep - (char *)block < wantoff)
  			continue;

  		cook = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk,

  					    (char *)dep - (char *)block);

  		ino = be64_to_cpu(dep->inumber);

  #if XFS_BIG_INUMS

  		ino += mp->m_inoadd;

  #endif

  
  		/*
  		 * If it didn't fit, set the final offset to here & return.
  		 */

  		if (filldir(dirent, dep->name, dep->namelen, cook & 0x7fffffff,

  			    ino, DT_UNKNOWN)) {

  			*offset = cook & 0x7fffffff;

  			xfs_da_brelse(NULL, bp);
  			return 0;

  		}
  	}
  
  	/*
  	 * Reached the end of the block.

  	 * Set the offset to a non-existent block 1 and return.

  	 */

  	*offset = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk + 1, 0) &
  			0x7fffffff;

  	xfs_da_brelse(NULL, bp);

  	return 0;
  }
  
  /*
   * Log leaf entries from the block.
   */
  static void
  xfs_dir2_block_log_leaf(
  	xfs_trans_t		*tp,		/* transaction structure */
  	xfs_dabuf_t		*bp,		/* block buffer */
  	int			first,		/* index of first logged leaf */
  	int			last)		/* index of last logged leaf */
  {
  	xfs_dir2_block_t	*block;		/* directory block structure */
  	xfs_dir2_leaf_entry_t	*blp;		/* block leaf entries */
  	xfs_dir2_block_tail_t	*btp;		/* block tail */
  	xfs_mount_t		*mp;		/* filesystem mount point */
  
  	mp = tp->t_mountp;
  	block = bp->data;

  	btp = xfs_dir2_block_tail_p(mp, block);
  	blp = xfs_dir2_block_leaf_p(btp);

  	xfs_da_log_buf(tp, bp, (uint)((char *)&blp[first] - (char *)block),
  		(uint)((char *)&blp[last + 1] - (char *)block - 1));
  }
  
  /*
   * Log the block tail.
   */
  static void
  xfs_dir2_block_log_tail(
  	xfs_trans_t		*tp,		/* transaction structure */
  	xfs_dabuf_t		*bp)		/* block buffer */
  {
  	xfs_dir2_block_t	*block;		/* directory block structure */
  	xfs_dir2_block_tail_t	*btp;		/* block tail */
  	xfs_mount_t		*mp;		/* filesystem mount point */
  
  	mp = tp->t_mountp;
  	block = bp->data;

  	btp = xfs_dir2_block_tail_p(mp, block);

  	xfs_da_log_buf(tp, bp, (uint)((char *)btp - (char *)block),
  		(uint)((char *)(btp + 1) - (char *)block - 1));
  }
  
  /*
   * Look up an entry in the block.  This is the external routine,
   * xfs_dir2_block_lookup_int does the real work.
   */
  int						/* error */
  xfs_dir2_block_lookup(
  	xfs_da_args_t		*args)		/* dir lookup arguments */
  {
  	xfs_dir2_block_t	*block;		/* block structure */
  	xfs_dir2_leaf_entry_t	*blp;		/* block leaf entries */
  	xfs_dabuf_t		*bp;		/* block buffer */
  	xfs_dir2_block_tail_t	*btp;		/* block tail */
  	xfs_dir2_data_entry_t	*dep;		/* block data entry */
  	xfs_inode_t		*dp;		/* incore inode */
  	int			ent;		/* entry index */
  	int			error;		/* error return value */
  	xfs_mount_t		*mp;		/* filesystem mount point */
  
  	xfs_dir2_trace_args("block_lookup", args);
  	/*
  	 * Get the buffer, look up the entry.
  	 * If not found (ENOENT) then return, have no buffer.
  	 */
  	if ((error = xfs_dir2_block_lookup_int(args, &bp, &ent)))
  		return error;
  	dp = args->dp;
  	mp = dp->i_mount;
  	block = bp->data;
  	xfs_dir2_data_check(dp, bp);

  	btp = xfs_dir2_block_tail_p(mp, block);
  	blp = xfs_dir2_block_leaf_p(btp);

  	/*
  	 * Get the offset from the leaf entry, to point to the data.
  	 */

  	dep = (xfs_dir2_data_entry_t *)((char *)block +
  		xfs_dir2_dataptr_to_off(mp, be32_to_cpu(blp[ent].address)));

  	/*

  	 * Fill in inode number, CI name if appropriate, release the block.

  	 */

  	args->inumber = be64_to_cpu(dep->inumber);

  	error = xfs_dir_cilookup_result(args, dep->name, dep->namelen);

  	xfs_da_brelse(args->trans, bp);

  	return XFS_ERROR(error);

  }
  
  /*
   * Internal block lookup routine.
   */
  static int					/* error */
  xfs_dir2_block_lookup_int(
  	xfs_da_args_t		*args,		/* dir lookup arguments */
  	xfs_dabuf_t		**bpp,		/* returned block buffer */
  	int			*entno)		/* returned entry number */
  {
  	xfs_dir2_dataptr_t	addr;		/* data entry address */
  	xfs_dir2_block_t	*block;		/* block structure */
  	xfs_dir2_leaf_entry_t	*blp;		/* block leaf entries */
  	xfs_dabuf_t		*bp;		/* block buffer */
  	xfs_dir2_block_tail_t	*btp;		/* block tail */
  	xfs_dir2_data_entry_t	*dep;		/* block data entry */
  	xfs_inode_t		*dp;		/* incore inode */
  	int			error;		/* error return value */
  	xfs_dahash_t		hash;		/* found hash value */
  	int			high;		/* binary search high index */
  	int			low;		/* binary search low index */
  	int			mid;		/* binary search current idx */
  	xfs_mount_t		*mp;		/* filesystem mount point */
  	xfs_trans_t		*tp;		/* transaction pointer */

  	enum xfs_dacmp		cmp;		/* comparison result */

  
  	dp = args->dp;
  	tp = args->trans;
  	mp = dp->i_mount;
  	/*
  	 * Read the buffer, return error if we can't get it.
  	 */
  	if ((error =
  	    xfs_da_read_buf(tp, dp, mp->m_dirdatablk, -1, &bp, XFS_DATA_FORK))) {
  		return error;
  	}
  	ASSERT(bp != NULL);
  	block = bp->data;
  	xfs_dir2_data_check(dp, bp);

  	btp = xfs_dir2_block_tail_p(mp, block);
  	blp = xfs_dir2_block_leaf_p(btp);

  	/*
  	 * Loop doing a binary search for our hash value.
  	 * Find our entry, ENOENT if it's not there.
  	 */

  	for (low = 0, high = be32_to_cpu(btp->count) - 1; ; ) {

  		ASSERT(low <= high);
  		mid = (low + high) >> 1;

  		if ((hash = be32_to_cpu(blp[mid].hashval)) == args->hashval)

  			break;
  		if (hash < args->hashval)
  			low = mid + 1;
  		else
  			high = mid - 1;
  		if (low > high) {

  			ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);

  			xfs_da_brelse(tp, bp);
  			return XFS_ERROR(ENOENT);
  		}
  	}
  	/*
  	 * Back up to the first one with the right hash value.
  	 */

  	while (mid > 0 && be32_to_cpu(blp[mid - 1].hashval) == args->hashval) {

  		mid--;
  	}
  	/*
  	 * Now loop forward through all the entries with the
  	 * right hash value looking for our name.
  	 */
  	do {

  		if ((addr = be32_to_cpu(blp[mid].address)) == XFS_DIR2_NULL_DATAPTR)

  			continue;
  		/*
  		 * Get pointer to the entry from the leaf.
  		 */
  		dep = (xfs_dir2_data_entry_t *)

  			((char *)block + xfs_dir2_dataptr_to_off(mp, addr));

  		/*

  		 * Compare name and if it's an exact match, return the index
  		 * and buffer. If it's the first case-insensitive match, store
  		 * the index and buffer and continue looking for an exact match.

  		 */

  		cmp = mp->m_dirnameops->compname(args, dep->name, dep->namelen);
  		if (cmp != XFS_CMP_DIFFERENT && cmp != args->cmpresult) {
  			args->cmpresult = cmp;

  			*bpp = bp;
  			*entno = mid;

  			if (cmp == XFS_CMP_EXACT)
  				return 0;

  		}

  	} while (++mid < be32_to_cpu(btp->count) &&
  			be32_to_cpu(blp[mid].hashval) == hash);

  	ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);

  	/*
  	 * Here, we can only be doing a lookup (not a rename or replace).
  	 * If a case-insensitive match was found earlier, return success.
  	 */
  	if (args->cmpresult == XFS_CMP_CASE)
  		return 0;

  	/*
  	 * No match, release the buffer and return ENOENT.
  	 */

  	xfs_da_brelse(tp, bp);
  	return XFS_ERROR(ENOENT);
  }
  
  /*
   * Remove an entry from a block format directory.
   * If that makes the block small enough to fit in shortform, transform it.
   */
  int						/* error */
  xfs_dir2_block_removename(
  	xfs_da_args_t		*args)		/* directory operation args */
  {
  	xfs_dir2_block_t	*block;		/* block structure */
  	xfs_dir2_leaf_entry_t	*blp;		/* block leaf pointer */
  	xfs_dabuf_t		*bp;		/* block buffer */
  	xfs_dir2_block_tail_t	*btp;		/* block tail */
  	xfs_dir2_data_entry_t	*dep;		/* block data entry */
  	xfs_inode_t		*dp;		/* incore inode */
  	int			ent;		/* block leaf entry index */
  	int			error;		/* error return value */
  	xfs_mount_t		*mp;		/* filesystem mount point */
  	int			needlog;	/* need to log block header */
  	int			needscan;	/* need to fixup bestfree */
  	xfs_dir2_sf_hdr_t	sfh;		/* shortform header */
  	int			size;		/* shortform size */
  	xfs_trans_t		*tp;		/* transaction pointer */
  
  	xfs_dir2_trace_args("block_removename", args);
  	/*
  	 * Look up the entry in the block.  Gets the buffer and entry index.
  	 * It will always be there, the vnodeops level does a lookup first.
  	 */
  	if ((error = xfs_dir2_block_lookup_int(args, &bp, &ent))) {
  		return error;
  	}
  	dp = args->dp;
  	tp = args->trans;
  	mp = dp->i_mount;
  	block = bp->data;

  	btp = xfs_dir2_block_tail_p(mp, block);
  	blp = xfs_dir2_block_leaf_p(btp);

  	/*
  	 * Point to the data entry using the leaf entry.
  	 */
  	dep = (xfs_dir2_data_entry_t *)

  	      ((char *)block + xfs_dir2_dataptr_to_off(mp, be32_to_cpu(blp[ent].address)));

  	/*
  	 * Mark the data entry's space free.
  	 */
  	needlog = needscan = 0;
  	xfs_dir2_data_make_free(tp, bp,
  		(xfs_dir2_data_aoff_t)((char *)dep - (char *)block),

  		xfs_dir2_data_entsize(dep->namelen), &needlog, &needscan);

  	/*
  	 * Fix up the block tail.
  	 */

  	be32_add_cpu(&btp->stale, 1);

  	xfs_dir2_block_log_tail(tp, bp);
  	/*
  	 * Remove the leaf entry by marking it stale.
  	 */

  	blp[ent].address = cpu_to_be32(XFS_DIR2_NULL_DATAPTR);

  	xfs_dir2_block_log_leaf(tp, bp, ent, ent);
  	/*
  	 * Fix up bestfree, log the header if necessary.
  	 */
  	if (needscan)

  		xfs_dir2_data_freescan(mp, (xfs_dir2_data_t *)block, &needlog);

  	if (needlog)
  		xfs_dir2_data_log_header(tp, bp);
  	xfs_dir2_data_check(dp, bp);
  	/*
  	 * See if the size as a shortform is good enough.
  	 */
  	if ((size = xfs_dir2_block_sfsize(dp, block, &sfh)) >
  	    XFS_IFORK_DSIZE(dp)) {
  		xfs_da_buf_done(bp);
  		return 0;
  	}
  	/*
  	 * If it works, do the conversion.
  	 */
  	return xfs_dir2_block_to_sf(args, bp, size, &sfh);
  }
  
  /*
   * Replace an entry in a V2 block directory.
   * Change the inode number to the new value.
   */
  int						/* error */
  xfs_dir2_block_replace(
  	xfs_da_args_t		*args)		/* directory operation args */
  {
  	xfs_dir2_block_t	*block;		/* block structure */
  	xfs_dir2_leaf_entry_t	*blp;		/* block leaf entries */
  	xfs_dabuf_t		*bp;		/* block buffer */
  	xfs_dir2_block_tail_t	*btp;		/* block tail */
  	xfs_dir2_data_entry_t	*dep;		/* block data entry */
  	xfs_inode_t		*dp;		/* incore inode */
  	int			ent;		/* leaf entry index */
  	int			error;		/* error return value */
  	xfs_mount_t		*mp;		/* filesystem mount point */
  
  	xfs_dir2_trace_args("block_replace", args);
  	/*
  	 * Lookup the entry in the directory.  Get buffer and entry index.
  	 * This will always succeed since the caller has already done a lookup.
  	 */
  	if ((error = xfs_dir2_block_lookup_int(args, &bp, &ent))) {
  		return error;
  	}
  	dp = args->dp;
  	mp = dp->i_mount;
  	block = bp->data;

  	btp = xfs_dir2_block_tail_p(mp, block);
  	blp = xfs_dir2_block_leaf_p(btp);

  	/*
  	 * Point to the data entry we need to change.
  	 */
  	dep = (xfs_dir2_data_entry_t *)

  	      ((char *)block + xfs_dir2_dataptr_to_off(mp, be32_to_cpu(blp[ent].address)));

  	ASSERT(be64_to_cpu(dep->inumber) != args->inumber);

  	/*
  	 * Change the inode number to the new value.
  	 */

  	dep->inumber = cpu_to_be64(args->inumber);

  	xfs_dir2_data_log_entry(args->trans, bp, dep);
  	xfs_dir2_data_check(dp, bp);
  	xfs_da_buf_done(bp);
  	return 0;
  }
  
  /*
   * Qsort comparison routine for the block leaf entries.
   */
  static int					/* sort order */
  xfs_dir2_block_sort(
  	const void			*a,	/* first leaf entry */
  	const void			*b)	/* second leaf entry */
  {
  	const xfs_dir2_leaf_entry_t	*la;	/* first leaf entry */
  	const xfs_dir2_leaf_entry_t	*lb;	/* second leaf entry */
  
  	la = a;
  	lb = b;

  	return be32_to_cpu(la->hashval) < be32_to_cpu(lb->hashval) ? -1 :
  		(be32_to_cpu(la->hashval) > be32_to_cpu(lb->hashval) ? 1 : 0);

  }
  
  /*
   * Convert a V2 leaf directory to a V2 block directory if possible.
   */
  int						/* error */
  xfs_dir2_leaf_to_block(
  	xfs_da_args_t		*args,		/* operation arguments */
  	xfs_dabuf_t		*lbp,		/* leaf buffer */
  	xfs_dabuf_t		*dbp)		/* data buffer */
  {

  	__be16			*bestsp;	/* leaf bests table */

  	xfs_dir2_block_t	*block;		/* block structure */
  	xfs_dir2_block_tail_t	*btp;		/* block tail */
  	xfs_inode_t		*dp;		/* incore directory inode */
  	xfs_dir2_data_unused_t	*dup;		/* unused data entry */
  	int			error;		/* error return value */
  	int			from;		/* leaf from index */
  	xfs_dir2_leaf_t		*leaf;		/* leaf structure */
  	xfs_dir2_leaf_entry_t	*lep;		/* leaf entry */
  	xfs_dir2_leaf_tail_t	*ltp;		/* leaf tail structure */
  	xfs_mount_t		*mp;		/* file system mount point */
  	int			needlog;	/* need to log data header */
  	int			needscan;	/* need to scan for bestfree */
  	xfs_dir2_sf_hdr_t	sfh;		/* shortform header */
  	int			size;		/* bytes used */

  	__be16			*tagp;		/* end of entry (tag) */

  	int			to;		/* block/leaf to index */
  	xfs_trans_t		*tp;		/* transaction pointer */
  
  	xfs_dir2_trace_args_bb("leaf_to_block", args, lbp, dbp);
  	dp = args->dp;
  	tp = args->trans;
  	mp = dp->i_mount;
  	leaf = lbp->data;

  	ASSERT(be16_to_cpu(leaf->hdr.info.magic) == XFS_DIR2_LEAF1_MAGIC);

  	ltp = xfs_dir2_leaf_tail_p(mp, leaf);

  	/*
  	 * If there are data blocks other than the first one, take this
  	 * opportunity to remove trailing empty data blocks that may have
  	 * been left behind during no-space-reservation operations.
  	 * These will show up in the leaf bests table.
  	 */
  	while (dp->i_d.di_size > mp->m_dirblksize) {

  		bestsp = xfs_dir2_leaf_bests_p(ltp);

  		if (be16_to_cpu(bestsp[be32_to_cpu(ltp->bestcount) - 1]) ==

  		    mp->m_dirblksize - (uint)sizeof(block->hdr)) {
  			if ((error =
  			    xfs_dir2_leaf_trim_data(args, lbp,

  				    (xfs_dir2_db_t)(be32_to_cpu(ltp->bestcount) - 1))))

  				goto out;
  		} else {
  			error = 0;
  			goto out;
  		}
  	}
  	/*
  	 * Read the data block if we don't already have it, give up if it fails.
  	 */
  	if (dbp == NULL &&
  	    (error = xfs_da_read_buf(tp, dp, mp->m_dirdatablk, -1, &dbp,
  		    XFS_DATA_FORK))) {
  		goto out;
  	}
  	block = dbp->data;

  	ASSERT(be32_to_cpu(block->hdr.magic) == XFS_DIR2_DATA_MAGIC);

  	/*
  	 * Size of the "leaf" area in the block.
  	 */
  	size = (uint)sizeof(block->tail) +

  	       (uint)sizeof(*lep) * (be16_to_cpu(leaf->hdr.count) - be16_to_cpu(leaf->hdr.stale));

  	/*
  	 * Look at the last data entry.
  	 */

  	tagp = (__be16 *)((char *)block + mp->m_dirblksize) - 1;
  	dup = (xfs_dir2_data_unused_t *)((char *)block + be16_to_cpu(*tagp));

  	/*
  	 * If it's not free or is too short we can't do it.
  	 */

  	if (be16_to_cpu(dup->freetag) != XFS_DIR2_DATA_FREE_TAG ||
  	    be16_to_cpu(dup->length) < size) {

  		error = 0;
  		goto out;
  	}
  	/*
  	 * Start converting it to block form.
  	 */

  	block->hdr.magic = cpu_to_be32(XFS_DIR2_BLOCK_MAGIC);

  	needlog = 1;
  	needscan = 0;
  	/*
  	 * Use up the space at the end of the block (blp/btp).
  	 */
  	xfs_dir2_data_use_free(tp, dbp, dup, mp->m_dirblksize - size, size,
  		&needlog, &needscan);
  	/*
  	 * Initialize the block tail.
  	 */

  	btp = xfs_dir2_block_tail_p(mp, block);

  	btp->count = cpu_to_be32(be16_to_cpu(leaf->hdr.count) - be16_to_cpu(leaf->hdr.stale));

  	btp->stale = 0;
  	xfs_dir2_block_log_tail(tp, dbp);
  	/*
  	 * Initialize the block leaf area.  We compact out stale entries.
  	 */

  	lep = xfs_dir2_block_leaf_p(btp);

  	for (from = to = 0; from < be16_to_cpu(leaf->hdr.count); from++) {

  		if (be32_to_cpu(leaf->ents[from].address) == XFS_DIR2_NULL_DATAPTR)

  			continue;
  		lep[to++] = leaf->ents[from];
  	}

  	ASSERT(to == be32_to_cpu(btp->count));
  	xfs_dir2_block_log_leaf(tp, dbp, 0, be32_to_cpu(btp->count) - 1);

  	/*
  	 * Scan the bestfree if we need it and log the data block header.
  	 */
  	if (needscan)

  		xfs_dir2_data_freescan(mp, (xfs_dir2_data_t *)block, &needlog);

  	if (needlog)
  		xfs_dir2_data_log_header(tp, dbp);
  	/*
  	 * Pitch the old leaf block.
  	 */
  	error = xfs_da_shrink_inode(args, mp->m_dirleafblk, lbp);
  	lbp = NULL;
  	if (error) {
  		goto out;
  	}
  	/*
  	 * Now see if the resulting block can be shrunken to shortform.
  	 */
  	if ((size = xfs_dir2_block_sfsize(dp, block, &sfh)) >
  	    XFS_IFORK_DSIZE(dp)) {
  		error = 0;
  		goto out;
  	}
  	return xfs_dir2_block_to_sf(args, dbp, size, &sfh);
  out:
  	if (lbp)
  		xfs_da_buf_done(lbp);
  	if (dbp)
  		xfs_da_buf_done(dbp);
  	return error;
  }
  
  /*
   * Convert the shortform directory to block form.
   */
  int						/* error */
  xfs_dir2_sf_to_block(
  	xfs_da_args_t		*args)		/* operation arguments */
  {
  	xfs_dir2_db_t		blkno;		/* dir-relative block # (0) */
  	xfs_dir2_block_t	*block;		/* block structure */
  	xfs_dir2_leaf_entry_t	*blp;		/* block leaf entries */
  	xfs_dabuf_t		*bp;		/* block buffer */
  	xfs_dir2_block_tail_t	*btp;		/* block tail pointer */
  	char			*buf;		/* sf buffer */
  	int			buf_len;
  	xfs_dir2_data_entry_t	*dep;		/* data entry pointer */
  	xfs_inode_t		*dp;		/* incore directory inode */
  	int			dummy;		/* trash */
  	xfs_dir2_data_unused_t	*dup;		/* unused entry pointer */
  	int			endoffset;	/* end of data objects */
  	int			error;		/* error return value */
  	int			i;		/* index */
  	xfs_mount_t		*mp;		/* filesystem mount point */
  	int			needlog;	/* need to log block header */
  	int			needscan;	/* need to scan block freespc */
  	int			newoffset;	/* offset from current entry */
  	int			offset;		/* target block offset */
  	xfs_dir2_sf_entry_t	*sfep;		/* sf entry pointer */
  	xfs_dir2_sf_t		*sfp;		/* shortform structure */

  	__be16			*tagp;		/* end of data entry */

  	xfs_trans_t		*tp;		/* transaction pointer */

  	struct xfs_name		name;

  
  	xfs_dir2_trace_args("sf_to_block", args);
  	dp = args->dp;
  	tp = args->trans;
  	mp = dp->i_mount;
  	ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
  	/*
  	 * Bomb out if the shortform directory is way too short.
  	 */
  	if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
  		ASSERT(XFS_FORCED_SHUTDOWN(mp));
  		return XFS_ERROR(EIO);
  	}
  	ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
  	ASSERT(dp->i_df.if_u1.if_data != NULL);
  	sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;

  	ASSERT(dp->i_d.di_size >= xfs_dir2_sf_hdr_size(sfp->hdr.i8count));

  	/*
  	 * Copy the directory into the stack buffer.
  	 * Then pitch the incore inode data so we can make extents.
  	 */
  
  	buf_len = dp->i_df.if_bytes;
  	buf = kmem_alloc(dp->i_df.if_bytes, KM_SLEEP);
  
  	memcpy(buf, sfp, dp->i_df.if_bytes);
  	xfs_idata_realloc(dp, -dp->i_df.if_bytes, XFS_DATA_FORK);
  	dp->i_d.di_size = 0;
  	xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
  	/*
  	 * Reset pointer - old sfp is gone.
  	 */
  	sfp = (xfs_dir2_sf_t *)buf;
  	/*
  	 * Add block 0 to the inode.
  	 */
  	error = xfs_dir2_grow_inode(args, XFS_DIR2_DATA_SPACE, &blkno);
  	if (error) {

  		kmem_free(buf);

  		return error;
  	}
  	/*
  	 * Initialize the data block.
  	 */
  	error = xfs_dir2_data_init(args, blkno, &bp);
  	if (error) {

  		kmem_free(buf);

  		return error;
  	}
  	block = bp->data;

  	block->hdr.magic = cpu_to_be32(XFS_DIR2_BLOCK_MAGIC);

  	/*
  	 * Compute size of block "tail" area.
  	 */
  	i = (uint)sizeof(*btp) +

  	    (sfp->hdr.count + 2) * (uint)sizeof(xfs_dir2_leaf_entry_t);

  	/*
  	 * The whole thing is initialized to free by the init routine.
  	 * Say we're using the leaf and tail area.
  	 */
  	dup = (xfs_dir2_data_unused_t *)block->u;
  	needlog = needscan = 0;
  	xfs_dir2_data_use_free(tp, bp, dup, mp->m_dirblksize - i, i, &needlog,
  		&needscan);
  	ASSERT(needscan == 0);
  	/*
  	 * Fill in the tail.
  	 */

  	btp = xfs_dir2_block_tail_p(mp, block);

  	btp->count = cpu_to_be32(sfp->hdr.count + 2);	/* ., .. */

  	btp->stale = 0;

  	blp = xfs_dir2_block_leaf_p(btp);

  	endoffset = (uint)((char *)blp - (char *)block);
  	/*
  	 * Remove the freespace, we'll manage it.
  	 */
  	xfs_dir2_data_use_free(tp, bp, dup,
  		(xfs_dir2_data_aoff_t)((char *)dup - (char *)block),

  		be16_to_cpu(dup->length), &needlog, &needscan);

  	/*
  	 * Create entry for .
  	 */
  	dep = (xfs_dir2_data_entry_t *)
  	      ((char *)block + XFS_DIR2_DATA_DOT_OFFSET);

  	dep->inumber = cpu_to_be64(dp->i_ino);

  	dep->namelen = 1;
  	dep->name[0] = '.';

  	tagp = xfs_dir2_data_entry_tag_p(dep);

  	*tagp = cpu_to_be16((char *)dep - (char *)block);

  	xfs_dir2_data_log_entry(tp, bp, dep);

  	blp[0].hashval = cpu_to_be32(xfs_dir_hash_dot);

  	blp[0].address = cpu_to_be32(xfs_dir2_byte_to_dataptr(mp,

  				(char *)dep - (char *)block));

  	/*
  	 * Create entry for ..
  	 */
  	dep = (xfs_dir2_data_entry_t *)
  		((char *)block + XFS_DIR2_DATA_DOTDOT_OFFSET);

  	dep->inumber = cpu_to_be64(xfs_dir2_sf_get_inumber(sfp, &sfp->hdr.parent));

  	dep->namelen = 2;
  	dep->name[0] = dep->name[1] = '.';

  	tagp = xfs_dir2_data_entry_tag_p(dep);

  	*tagp = cpu_to_be16((char *)dep - (char *)block);

  	xfs_dir2_data_log_entry(tp, bp, dep);

  	blp[1].hashval = cpu_to_be32(xfs_dir_hash_dotdot);

  	blp[1].address = cpu_to_be32(xfs_dir2_byte_to_dataptr(mp,

  				(char *)dep - (char *)block));

  	offset = XFS_DIR2_DATA_FIRST_OFFSET;
  	/*
  	 * Loop over existing entries, stuff them in.
  	 */

  	if ((i = 0) == sfp->hdr.count)

  		sfep = NULL;
  	else

  		sfep = xfs_dir2_sf_firstentry(sfp);

  	/*
  	 * Need to preserve the existing offset values in the sf directory.
  	 * Insert holes (unused entries) where necessary.
  	 */
  	while (offset < endoffset) {
  		/*
  		 * sfep is null when we reach the end of the list.
  		 */
  		if (sfep == NULL)
  			newoffset = endoffset;
  		else

  			newoffset = xfs_dir2_sf_get_offset(sfep);

  		/*
  		 * There should be a hole here, make one.
  		 */
  		if (offset < newoffset) {
  			dup = (xfs_dir2_data_unused_t *)
  			      ((char *)block + offset);

  			dup->freetag = cpu_to_be16(XFS_DIR2_DATA_FREE_TAG);
  			dup->length = cpu_to_be16(newoffset - offset);

  			*xfs_dir2_data_unused_tag_p(dup) = cpu_to_be16(

  				((char *)dup - (char *)block));
  			xfs_dir2_data_log_unused(tp, bp, dup);
  			(void)xfs_dir2_data_freeinsert((xfs_dir2_data_t *)block,
  				dup, &dummy);

  			offset += be16_to_cpu(dup->length);

  			continue;
  		}
  		/*
  		 * Copy a real entry.
  		 */
  		dep = (xfs_dir2_data_entry_t *)((char *)block + newoffset);

  		dep->inumber = cpu_to_be64(xfs_dir2_sf_get_inumber(sfp,
  				xfs_dir2_sf_inumberp(sfep)));

  		dep->namelen = sfep->namelen;
  		memcpy(dep->name, sfep->name, dep->namelen);

  		tagp = xfs_dir2_data_entry_tag_p(dep);

  		*tagp = cpu_to_be16((char *)dep - (char *)block);

  		xfs_dir2_data_log_entry(tp, bp, dep);

  		name.name = sfep->name;
  		name.len = sfep->namelen;
  		blp[2 + i].hashval = cpu_to_be32(mp->m_dirnameops->
  							hashname(&name));

  		blp[2 + i].address = cpu_to_be32(xfs_dir2_byte_to_dataptr(mp,

  						 (char *)dep - (char *)block));
  		offset = (int)((char *)(tagp + 1) - (char *)block);

  		if (++i == sfp->hdr.count)

  			sfep = NULL;
  		else

  			sfep = xfs_dir2_sf_nextentry(sfp, sfep);

  	}
  	/* Done with the temporary buffer */

  	kmem_free(buf);

  	/*
  	 * Sort the leaf entries by hash value.
  	 */

  	xfs_sort(blp, be32_to_cpu(btp->count), sizeof(*blp), xfs_dir2_block_sort);

  	/*
  	 * Log the leaf entry area and tail.
  	 * Already logged the header in data_init, ignore needlog.
  	 */
  	ASSERT(needscan == 0);

  	xfs_dir2_block_log_leaf(tp, bp, 0, be32_to_cpu(btp->count) - 1);

  	xfs_dir2_block_log_tail(tp, bp);
  	xfs_dir2_data_check(dp, bp);
  	xfs_da_buf_done(bp);
  	return 0;
  }