/*

   * 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_error.h"
  #include "xfs_dir2_data.h"
  #include "xfs_dir2_leaf.h"
  #include "xfs_dir2_block.h"
  #include "xfs_dir2_trace.h"
  
  /*
   * Prototypes for internal functions.
   */
  static void xfs_dir2_sf_addname_easy(xfs_da_args_t *args,
  				     xfs_dir2_sf_entry_t *sfep,
  				     xfs_dir2_data_aoff_t offset,
  				     int new_isize);
  static void xfs_dir2_sf_addname_hard(xfs_da_args_t *args, int objchange,
  				     int new_isize);
  static int xfs_dir2_sf_addname_pick(xfs_da_args_t *args, int objchange,
  				    xfs_dir2_sf_entry_t **sfepp,
  				    xfs_dir2_data_aoff_t *offsetp);
  #ifdef DEBUG
  static void xfs_dir2_sf_check(xfs_da_args_t *args);
  #else
  #define	xfs_dir2_sf_check(args)
  #endif /* DEBUG */
  #if XFS_BIG_INUMS
  static void xfs_dir2_sf_toino4(xfs_da_args_t *args);
  static void xfs_dir2_sf_toino8(xfs_da_args_t *args);
  #endif /* XFS_BIG_INUMS */
  
  /*
   * Given a block directory (dp/block), calculate its size as a shortform (sf)
   * directory and a header for the sf directory, if it will fit it the
   * space currently present in the inode.  If it won't fit, the output
   * size is too big (but not accurate).
   */
  int						/* size for sf form */
  xfs_dir2_block_sfsize(
  	xfs_inode_t		*dp,		/* incore inode pointer */
  	xfs_dir2_block_t	*block,		/* block directory data */
  	xfs_dir2_sf_hdr_t	*sfhp)		/* output: header for sf form */
  {
  	xfs_dir2_dataptr_t	addr;		/* data entry address */
  	xfs_dir2_leaf_entry_t	*blp;		/* leaf area of the block */
  	xfs_dir2_block_tail_t	*btp;		/* tail area of the block */
  	int			count;		/* shortform entry count */
  	xfs_dir2_data_entry_t	*dep;		/* data entry in the block */
  	int			i;		/* block entry index */
  	int			i8count;	/* count of big-inode entries */
  	int			isdot;		/* entry is "." */
  	int			isdotdot;	/* entry is ".." */
  	xfs_mount_t		*mp;		/* mount structure pointer */
  	int			namelen;	/* total name bytes */

  	xfs_ino_t		parent = 0;	/* parent inode number */

  	int			size=0;		/* total computed size */
  
  	mp = dp->i_mount;
  
  	count = i8count = namelen = 0;

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

  
  	/*
  	 * Iterate over the block's data entries by using the leaf pointers.
  	 */

  	for (i = 0; i < be32_to_cpu(btp->count); i++) {

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

  			continue;
  		/*
  		 * Calculate the pointer to the entry at hand.
  		 */
  		dep = (xfs_dir2_data_entry_t *)

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

  		/*
  		 * Detect . and .., so we can special-case them.
  		 * . is not included in sf directories.
  		 * .. is included by just the parent inode number.
  		 */
  		isdot = dep->namelen == 1 && dep->name[0] == '.';
  		isdotdot =
  			dep->namelen == 2 &&
  			dep->name[0] == '.' && dep->name[1] == '.';
  #if XFS_BIG_INUMS
  		if (!isdot)

  			i8count += be64_to_cpu(dep->inumber) > XFS_DIR2_MAX_SHORT_INUM;

  #endif
  		if (!isdot && !isdotdot) {
  			count++;
  			namelen += dep->namelen;
  		} else if (isdotdot)

  			parent = be64_to_cpu(dep->inumber);

  		/*
  		 * Calculate the new size, see if we should give up yet.
  		 */

  		size = xfs_dir2_sf_hdr_size(i8count) +		/* header */

  		       count +					/* namelen */
  		       count * (uint)sizeof(xfs_dir2_sf_off_t) + /* offset */
  		       namelen +				/* name */
  		       (i8count ?				/* inumber */
  				(uint)sizeof(xfs_dir2_ino8_t) * count :
  				(uint)sizeof(xfs_dir2_ino4_t) * count);
  		if (size > XFS_IFORK_DSIZE(dp))
  			return size;		/* size value is a failure */
  	}
  	/*
  	 * Create the output header, if it worked.
  	 */
  	sfhp->count = count;
  	sfhp->i8count = i8count;

  	xfs_dir2_sf_put_inumber((xfs_dir2_sf_t *)sfhp, &parent, &sfhp->parent);

  	return size;
  }
  
  /*
   * Convert a block format directory to shortform.
   * Caller has already checked that it will fit, and built us a header.
   */
  int						/* error */
  xfs_dir2_block_to_sf(
  	xfs_da_args_t		*args,		/* operation arguments */
  	xfs_dabuf_t		*bp,		/* block buffer */
  	int			size,		/* shortform directory size */
  	xfs_dir2_sf_hdr_t	*sfhp)		/* shortform directory hdr */
  {
  	xfs_dir2_block_t	*block;		/* block structure */
  	xfs_dir2_block_tail_t	*btp;		/* block tail pointer */
  	xfs_dir2_data_entry_t	*dep;		/* data entry pointer */
  	xfs_inode_t		*dp;		/* incore directory inode */
  	xfs_dir2_data_unused_t	*dup;		/* unused data pointer */
  	char			*endptr;	/* end of data entries */
  	int			error;		/* error return value */
  	int			logflags;	/* inode logging flags */
  	xfs_mount_t		*mp;		/* filesystem mount point */
  	char			*ptr;		/* current data pointer */
  	xfs_dir2_sf_entry_t	*sfep;		/* shortform entry */
  	xfs_dir2_sf_t		*sfp;		/* shortform structure */
  	xfs_ino_t               temp;
  
  	xfs_dir2_trace_args_sb("block_to_sf", args, size, bp);
  	dp = args->dp;
  	mp = dp->i_mount;
  
  	/*
  	 * Make a copy of the block data, so we can shrink the inode
  	 * and add local data.
  	 */
  	block = kmem_alloc(mp->m_dirblksize, KM_SLEEP);
  	memcpy(block, bp->data, mp->m_dirblksize);
  	logflags = XFS_ILOG_CORE;
  	if ((error = xfs_dir2_shrink_inode(args, mp->m_dirdatablk, bp))) {
  		ASSERT(error != ENOSPC);
  		goto out;
  	}
  	/*
  	 * The buffer is now unconditionally gone, whether
  	 * xfs_dir2_shrink_inode worked or not.
  	 *
  	 * Convert the inode to local format.
  	 */
  	dp->i_df.if_flags &= ~XFS_IFEXTENTS;
  	dp->i_df.if_flags |= XFS_IFINLINE;
  	dp->i_d.di_format = XFS_DINODE_FMT_LOCAL;
  	ASSERT(dp->i_df.if_bytes == 0);
  	xfs_idata_realloc(dp, size, XFS_DATA_FORK);
  	logflags |= XFS_ILOG_DDATA;
  	/*
  	 * Copy the header into the newly allocate local space.
  	 */
  	sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;

  	memcpy(sfp, sfhp, xfs_dir2_sf_hdr_size(sfhp->i8count));

  	dp->i_d.di_size = size;
  	/*
  	 * Set up to loop over the block's entries.
  	 */

  	btp = xfs_dir2_block_tail_p(mp, block);

  	ptr = (char *)block->u;

  	endptr = (char *)xfs_dir2_block_leaf_p(btp);
  	sfep = xfs_dir2_sf_firstentry(sfp);

  	/*
  	 * Loop over the active and unused entries.
  	 * Stop when we reach the leaf/tail portion of the block.
  	 */
  	while (ptr < endptr) {
  		/*
  		 * If it's unused, just skip over it.
  		 */
  		dup = (xfs_dir2_data_unused_t *)ptr;

  		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;
  		/*
  		 * Skip .
  		 */
  		if (dep->namelen == 1 && dep->name[0] == '.')

  			ASSERT(be64_to_cpu(dep->inumber) == dp->i_ino);

  		/*
  		 * Skip .., but make sure the inode number is right.
  		 */
  		else if (dep->namelen == 2 &&
  			 dep->name[0] == '.' && dep->name[1] == '.')

  			ASSERT(be64_to_cpu(dep->inumber) ==

  			       xfs_dir2_sf_get_inumber(sfp, &sfp->hdr.parent));

  		/*
  		 * Normal entry, copy it into shortform.
  		 */
  		else {
  			sfep->namelen = dep->namelen;

  			xfs_dir2_sf_put_offset(sfep,

  				(xfs_dir2_data_aoff_t)
  				((char *)dep - (char *)block));
  			memcpy(sfep->name, dep->name, dep->namelen);

  			temp = be64_to_cpu(dep->inumber);

  			xfs_dir2_sf_put_inumber(sfp, &temp,
  				xfs_dir2_sf_inumberp(sfep));
  			sfep = xfs_dir2_sf_nextentry(sfp, sfep);

  		}

  		ptr += xfs_dir2_data_entsize(dep->namelen);

  	}
  	ASSERT((char *)sfep - (char *)sfp == size);
  	xfs_dir2_sf_check(args);
  out:
  	xfs_trans_log_inode(args->trans, dp, logflags);

  	kmem_free(block);

  	return error;
  }
  
  /*
   * Add a name to a shortform directory.
   * There are two algorithms, "easy" and "hard" which we decide on
   * before changing anything.
   * Convert to block form if necessary, if the new entry won't fit.
   */
  int						/* error */
  xfs_dir2_sf_addname(
  	xfs_da_args_t		*args)		/* operation arguments */
  {
  	int			add_entsize;	/* size of the new entry */
  	xfs_inode_t		*dp;		/* incore directory inode */
  	int			error;		/* error return value */
  	int			incr_isize;	/* total change in size */
  	int			new_isize;	/* di_size after adding name */
  	int			objchange;	/* changing to 8-byte inodes */

  	xfs_dir2_data_aoff_t	offset = 0;	/* offset for new entry */

  	int			old_isize;	/* di_size before adding name */
  	int			pick;		/* which algorithm to use */
  	xfs_dir2_sf_t		*sfp;		/* shortform structure */

  	xfs_dir2_sf_entry_t	*sfep = NULL;	/* shortform entry */

  
  	xfs_dir2_trace_args("sf_addname", args);
  	ASSERT(xfs_dir2_sf_lookup(args) == ENOENT);
  	dp = args->dp;
  	ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
  	/*
  	 * Make sure the shortform value has some of its header.
  	 */
  	if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
  		ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
  		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));

  	/*
  	 * Compute entry (and change in) size.
  	 */

  	add_entsize = xfs_dir2_sf_entsize_byname(sfp, args->namelen);

  	incr_isize = add_entsize;
  	objchange = 0;
  #if XFS_BIG_INUMS
  	/*
  	 * Do we have to change to 8 byte inodes?
  	 */
  	if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && sfp->hdr.i8count == 0) {
  		/*
  		 * Yes, adjust the entry size and the total size.
  		 */
  		add_entsize +=
  			(uint)sizeof(xfs_dir2_ino8_t) -
  			(uint)sizeof(xfs_dir2_ino4_t);
  		incr_isize +=
  			(sfp->hdr.count + 2) *
  			((uint)sizeof(xfs_dir2_ino8_t) -
  			 (uint)sizeof(xfs_dir2_ino4_t));
  		objchange = 1;
  	}
  #endif
  	old_isize = (int)dp->i_d.di_size;
  	new_isize = old_isize + incr_isize;
  	/*
  	 * Won't fit as shortform any more (due to size),
  	 * or the pick routine says it won't (due to offset values).
  	 */
  	if (new_isize > XFS_IFORK_DSIZE(dp) ||
  	    (pick =
  	     xfs_dir2_sf_addname_pick(args, objchange, &sfep, &offset)) == 0) {
  		/*
  		 * Just checking or no space reservation, it doesn't fit.
  		 */

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

  			return XFS_ERROR(ENOSPC);
  		/*
  		 * Convert to block form then add the name.
  		 */
  		error = xfs_dir2_sf_to_block(args);
  		if (error)
  			return error;
  		return xfs_dir2_block_addname(args);
  	}
  	/*
  	 * Just checking, it fits.
  	 */

  	if (args->op_flags & XFS_DA_OP_JUSTCHECK)

  		return 0;
  	/*
  	 * Do it the easy way - just add it at the end.
  	 */
  	if (pick == 1)
  		xfs_dir2_sf_addname_easy(args, sfep, offset, new_isize);
  	/*
  	 * Do it the hard way - look for a place to insert the new entry.
  	 * Convert to 8 byte inode numbers first if necessary.
  	 */
  	else {
  		ASSERT(pick == 2);
  #if XFS_BIG_INUMS
  		if (objchange)
  			xfs_dir2_sf_toino8(args);
  #endif
  		xfs_dir2_sf_addname_hard(args, objchange, new_isize);
  	}
  	xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
  	return 0;
  }
  
  /*
   * Add the new entry the "easy" way.
   * This is copying the old directory and adding the new entry at the end.
   * Since it's sorted by "offset" we need room after the last offset
   * that's already there, and then room to convert to a block directory.
   * This is already checked by the pick routine.
   */
  static void
  xfs_dir2_sf_addname_easy(
  	xfs_da_args_t		*args,		/* operation arguments */
  	xfs_dir2_sf_entry_t	*sfep,		/* pointer to new entry */
  	xfs_dir2_data_aoff_t	offset,		/* offset to use for new ent */
  	int			new_isize)	/* new directory size */
  {
  	int			byteoff;	/* byte offset in sf dir */
  	xfs_inode_t		*dp;		/* incore directory inode */
  	xfs_dir2_sf_t		*sfp;		/* shortform structure */
  
  	dp = args->dp;
  
  	sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
  	byteoff = (int)((char *)sfep - (char *)sfp);
  	/*
  	 * Grow the in-inode space.
  	 */

  	xfs_idata_realloc(dp, xfs_dir2_sf_entsize_byname(sfp, args->namelen),

  		XFS_DATA_FORK);
  	/*
  	 * Need to set up again due to realloc of the inode data.
  	 */
  	sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
  	sfep = (xfs_dir2_sf_entry_t *)((char *)sfp + byteoff);
  	/*
  	 * Fill in the new entry.
  	 */
  	sfep->namelen = args->namelen;

  	xfs_dir2_sf_put_offset(sfep, offset);

  	memcpy(sfep->name, args->name, sfep->namelen);

  	xfs_dir2_sf_put_inumber(sfp, &args->inumber,
  		xfs_dir2_sf_inumberp(sfep));

  	/*
  	 * Update the header and inode.
  	 */
  	sfp->hdr.count++;
  #if XFS_BIG_INUMS
  	if (args->inumber > XFS_DIR2_MAX_SHORT_INUM)
  		sfp->hdr.i8count++;
  #endif
  	dp->i_d.di_size = new_isize;
  	xfs_dir2_sf_check(args);
  }
  
  /*
   * Add the new entry the "hard" way.
   * The caller has already converted to 8 byte inode numbers if necessary,
   * in which case we need to leave the i8count at 1.
   * Find a hole that the new entry will fit into, and copy
   * the first part of the entries, the new entry, and the last part of
   * the entries.
   */
  /* ARGSUSED */
  static void
  xfs_dir2_sf_addname_hard(
  	xfs_da_args_t		*args,		/* operation arguments */
  	int			objchange,	/* changing inode number size */
  	int			new_isize)	/* new directory size */
  {
  	int			add_datasize;	/* data size need for new ent */
  	char			*buf;		/* buffer for old */
  	xfs_inode_t		*dp;		/* incore directory inode */
  	int			eof;		/* reached end of old dir */
  	int			nbytes;		/* temp for byte copies */
  	xfs_dir2_data_aoff_t	new_offset;	/* next offset value */
  	xfs_dir2_data_aoff_t	offset;		/* current offset value */
  	int			old_isize;	/* previous di_size */
  	xfs_dir2_sf_entry_t	*oldsfep;	/* entry in original dir */
  	xfs_dir2_sf_t		*oldsfp;	/* original shortform dir */
  	xfs_dir2_sf_entry_t	*sfep;		/* entry in new dir */
  	xfs_dir2_sf_t		*sfp;		/* new shortform dir */
  
  	/*
  	 * Copy the old directory to the stack buffer.
  	 */
  	dp = args->dp;
  
  	sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
  	old_isize = (int)dp->i_d.di_size;
  	buf = kmem_alloc(old_isize, KM_SLEEP);
  	oldsfp = (xfs_dir2_sf_t *)buf;
  	memcpy(oldsfp, sfp, old_isize);
  	/*
  	 * Loop over the old directory finding the place we're going
  	 * to insert the new entry.
  	 * If it's going to end up at the end then oldsfep will point there.
  	 */
  	for (offset = XFS_DIR2_DATA_FIRST_OFFSET,

  	      oldsfep = xfs_dir2_sf_firstentry(oldsfp),
  	      add_datasize = xfs_dir2_data_entsize(args->namelen),

  	      eof = (char *)oldsfep == &buf[old_isize];
  	     !eof;

  	     offset = new_offset + xfs_dir2_data_entsize(oldsfep->namelen),
  	      oldsfep = xfs_dir2_sf_nextentry(oldsfp, oldsfep),

  	      eof = (char *)oldsfep == &buf[old_isize]) {

  		new_offset = xfs_dir2_sf_get_offset(oldsfep);

  		if (offset + add_datasize <= new_offset)
  			break;
  	}
  	/*
  	 * Get rid of the old directory, then allocate space for
  	 * the new one.  We do this so xfs_idata_realloc won't copy
  	 * the data.
  	 */
  	xfs_idata_realloc(dp, -old_isize, XFS_DATA_FORK);
  	xfs_idata_realloc(dp, new_isize, XFS_DATA_FORK);
  	/*
  	 * Reset the pointer since the buffer was reallocated.
  	 */
  	sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
  	/*
  	 * Copy the first part of the directory, including the header.
  	 */
  	nbytes = (int)((char *)oldsfep - (char *)oldsfp);
  	memcpy(sfp, oldsfp, nbytes);
  	sfep = (xfs_dir2_sf_entry_t *)((char *)sfp + nbytes);
  	/*
  	 * Fill in the new entry, and update the header counts.
  	 */
  	sfep->namelen = args->namelen;

  	xfs_dir2_sf_put_offset(sfep, offset);

  	memcpy(sfep->name, args->name, sfep->namelen);

  	xfs_dir2_sf_put_inumber(sfp, &args->inumber,
  		xfs_dir2_sf_inumberp(sfep));

  	sfp->hdr.count++;
  #if XFS_BIG_INUMS
  	if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && !objchange)
  		sfp->hdr.i8count++;
  #endif
  	/*
  	 * If there's more left to copy, do that.
  	 */
  	if (!eof) {

  		sfep = xfs_dir2_sf_nextentry(sfp, sfep);

  		memcpy(sfep, oldsfep, old_isize - nbytes);
  	}

  	kmem_free(buf);

  	dp->i_d.di_size = new_isize;
  	xfs_dir2_sf_check(args);
  }
  
  /*
   * Decide if the new entry will fit at all.
   * If it will fit, pick between adding the new entry to the end (easy)
   * or somewhere else (hard).
   * Return 0 (won't fit), 1 (easy), 2 (hard).
   */
  /*ARGSUSED*/
  static int					/* pick result */
  xfs_dir2_sf_addname_pick(
  	xfs_da_args_t		*args,		/* operation arguments */
  	int			objchange,	/* inode # size changes */
  	xfs_dir2_sf_entry_t	**sfepp,	/* out(1): new entry ptr */
  	xfs_dir2_data_aoff_t	*offsetp)	/* out(1): new offset */
  {
  	xfs_inode_t		*dp;		/* incore directory inode */
  	int			holefit;	/* found hole it will fit in */
  	int			i;		/* entry number */
  	xfs_mount_t		*mp;		/* filesystem mount point */
  	xfs_dir2_data_aoff_t	offset;		/* data block offset */
  	xfs_dir2_sf_entry_t	*sfep;		/* shortform entry */
  	xfs_dir2_sf_t		*sfp;		/* shortform structure */
  	int			size;		/* entry's data size */
  	int			used;		/* data bytes used */
  
  	dp = args->dp;
  	mp = dp->i_mount;
  
  	sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;

  	size = xfs_dir2_data_entsize(args->namelen);

  	offset = XFS_DIR2_DATA_FIRST_OFFSET;

  	sfep = xfs_dir2_sf_firstentry(sfp);

  	holefit = 0;
  	/*
  	 * Loop over sf entries.
  	 * Keep track of data offset and whether we've seen a place
  	 * to insert the new entry.
  	 */
  	for (i = 0; i < sfp->hdr.count; i++) {
  		if (!holefit)

  			holefit = offset + size <= xfs_dir2_sf_get_offset(sfep);
  		offset = xfs_dir2_sf_get_offset(sfep) +
  			 xfs_dir2_data_entsize(sfep->namelen);
  		sfep = xfs_dir2_sf_nextentry(sfp, sfep);

  	}
  	/*
  	 * Calculate data bytes used excluding the new entry, if this
  	 * was a data block (block form directory).
  	 */
  	used = offset +
  	       (sfp->hdr.count + 3) * (uint)sizeof(xfs_dir2_leaf_entry_t) +
  	       (uint)sizeof(xfs_dir2_block_tail_t);
  	/*
  	 * If it won't fit in a block form then we can't insert it,
  	 * we'll go back, convert to block, then try the insert and convert
  	 * to leaf.
  	 */
  	if (used + (holefit ? 0 : size) > mp->m_dirblksize)
  		return 0;
  	/*
  	 * If changing the inode number size, do it the hard way.
  	 */
  #if XFS_BIG_INUMS
  	if (objchange) {
  		return 2;
  	}
  #else
  	ASSERT(objchange == 0);
  #endif
  	/*
  	 * If it won't fit at the end then do it the hard way (use the hole).
  	 */
  	if (used + size > mp->m_dirblksize)
  		return 2;
  	/*
  	 * Do it the easy way.
  	 */
  	*sfepp = sfep;
  	*offsetp = offset;
  	return 1;
  }
  
  #ifdef DEBUG
  /*
   * Check consistency of shortform directory, assert if bad.
   */
  static void
  xfs_dir2_sf_check(
  	xfs_da_args_t		*args)		/* operation arguments */
  {
  	xfs_inode_t		*dp;		/* incore directory inode */
  	int			i;		/* entry number */
  	int			i8count;	/* number of big inode#s */
  	xfs_ino_t		ino;		/* entry inode number */
  	int			offset;		/* data offset */
  	xfs_dir2_sf_entry_t	*sfep;		/* shortform dir entry */
  	xfs_dir2_sf_t		*sfp;		/* shortform structure */
  
  	dp = args->dp;
  
  	sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
  	offset = XFS_DIR2_DATA_FIRST_OFFSET;

  	ino = xfs_dir2_sf_get_inumber(sfp, &sfp->hdr.parent);

  	i8count = ino > XFS_DIR2_MAX_SHORT_INUM;

  	for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp);

  	     i < sfp->hdr.count;

  	     i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep)) {
  		ASSERT(xfs_dir2_sf_get_offset(sfep) >= offset);
  		ino = xfs_dir2_sf_get_inumber(sfp, xfs_dir2_sf_inumberp(sfep));

  		i8count += ino > XFS_DIR2_MAX_SHORT_INUM;
  		offset =

  			xfs_dir2_sf_get_offset(sfep) +
  			xfs_dir2_data_entsize(sfep->namelen);

  	}
  	ASSERT(i8count == sfp->hdr.i8count);
  	ASSERT(XFS_BIG_INUMS || i8count == 0);
  	ASSERT((char *)sfep - (char *)sfp == dp->i_d.di_size);
  	ASSERT(offset +
  	       (sfp->hdr.count + 2) * (uint)sizeof(xfs_dir2_leaf_entry_t) +
  	       (uint)sizeof(xfs_dir2_block_tail_t) <=
  	       dp->i_mount->m_dirblksize);
  }
  #endif	/* DEBUG */
  
  /*
   * Create a new (shortform) directory.
   */
  int					/* error, always 0 */
  xfs_dir2_sf_create(
  	xfs_da_args_t	*args,		/* operation arguments */
  	xfs_ino_t	pino)		/* parent inode number */
  {
  	xfs_inode_t	*dp;		/* incore directory inode */
  	int		i8count;	/* parent inode is an 8-byte number */
  	xfs_dir2_sf_t	*sfp;		/* shortform structure */
  	int		size;		/* directory size */
  
  	xfs_dir2_trace_args_i("sf_create", args, pino);
  	dp = args->dp;
  
  	ASSERT(dp != NULL);
  	ASSERT(dp->i_d.di_size == 0);
  	/*
  	 * If it's currently a zero-length extent file,
  	 * convert it to local format.
  	 */
  	if (dp->i_d.di_format == XFS_DINODE_FMT_EXTENTS) {
  		dp->i_df.if_flags &= ~XFS_IFEXTENTS;	/* just in case */
  		dp->i_d.di_format = XFS_DINODE_FMT_LOCAL;
  		xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
  		dp->i_df.if_flags |= XFS_IFINLINE;
  	}
  	ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
  	ASSERT(dp->i_df.if_bytes == 0);
  	i8count = pino > XFS_DIR2_MAX_SHORT_INUM;

  	size = xfs_dir2_sf_hdr_size(i8count);

  	/*
  	 * Make a buffer for the data.
  	 */
  	xfs_idata_realloc(dp, size, XFS_DATA_FORK);
  	/*
  	 * Fill in the header,
  	 */
  	sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
  	sfp->hdr.i8count = i8count;
  	/*
  	 * Now can put in the inode number, since i8count is set.
  	 */

  	xfs_dir2_sf_put_inumber(sfp, &pino, &sfp->hdr.parent);

  	sfp->hdr.count = 0;
  	dp->i_d.di_size = size;
  	xfs_dir2_sf_check(args);
  	xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
  	return 0;
  }
  
  int						/* error */
  xfs_dir2_sf_getdents(
  	xfs_inode_t		*dp,		/* incore directory inode */

  	void			*dirent,
  	xfs_off_t		*offset,
  	filldir_t		filldir)

  {

  	int			i;		/* shortform entry number */
  	xfs_mount_t		*mp;		/* filesystem mount point */
  	xfs_dir2_dataptr_t	off;		/* current entry's offset */

  	xfs_dir2_sf_entry_t	*sfep;		/* shortform directory entry */
  	xfs_dir2_sf_t		*sfp;		/* shortform structure */

  	xfs_dir2_dataptr_t	dot_offset;
  	xfs_dir2_dataptr_t	dotdot_offset;
  	xfs_ino_t		ino;

  
  	mp = dp->i_mount;
  
  	ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
  	/*
  	 * Give up if the 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));

  
  	/*
  	 * 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;

  
  	/*

  	 * Precalculate offsets for . and .. as we will always need them.
  	 *
  	 * XXX(hch): the second argument is sometimes 0 and sometimes
  	 * mp->m_dirdatablk.

  	 */

  	dot_offset = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk,
  					     XFS_DIR2_DATA_DOT_OFFSET);
  	dotdot_offset = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk,
  						XFS_DIR2_DATA_DOTDOT_OFFSET);

  	/*
  	 * Put . entry unless we're starting past it.
  	 */

  	if (*offset <= dot_offset) {

  		if (filldir(dirent, ".", 1, dot_offset & 0x7fffffff, dp->i_ino, DT_DIR)) {

  			*offset = dot_offset & 0x7fffffff;

  			return 0;

  		}
  	}
  
  	/*
  	 * Put .. entry unless we're starting past it.
  	 */

  	if (*offset <= dotdot_offset) {

  		ino = xfs_dir2_sf_get_inumber(sfp, &sfp->hdr.parent);

  		if (filldir(dirent, "..", 2, dotdot_offset & 0x7fffffff, ino, DT_DIR)) {
  			*offset = dotdot_offset & 0x7fffffff;

  			return 0;

  		}
  	}
  
  	/*
  	 * Loop while there are more entries and put'ing works.
  	 */

  	sfep = xfs_dir2_sf_firstentry(sfp);
  	for (i = 0; i < sfp->hdr.count; i++) {

  		off = xfs_dir2_db_off_to_dataptr(mp, mp->m_dirdatablk,
  				xfs_dir2_sf_get_offset(sfep));

  		if (*offset > off) {
  			sfep = xfs_dir2_sf_nextentry(sfp, sfep);

  			continue;

  		}

  		ino = xfs_dir2_sf_get_inumber(sfp, xfs_dir2_sf_inumberp(sfep));

  		if (filldir(dirent, sfep->name, sfep->namelen,

  			    off & 0x7fffffff, ino, DT_UNKNOWN)) {
  			*offset = off & 0x7fffffff;

  			return 0;

  		}

  		sfep = xfs_dir2_sf_nextentry(sfp, sfep);

  	}

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

  	return 0;
  }
  
  /*
   * Lookup an entry in a shortform directory.
   * Returns EEXIST if found, ENOENT if not found.
   */
  int						/* error */
  xfs_dir2_sf_lookup(
  	xfs_da_args_t		*args)		/* operation arguments */
  {
  	xfs_inode_t		*dp;		/* incore directory inode */
  	int			i;		/* entry index */

  	int			error;

  	xfs_dir2_sf_entry_t	*sfep;		/* shortform directory entry */
  	xfs_dir2_sf_t		*sfp;		/* shortform structure */

  	enum xfs_dacmp		cmp;		/* comparison result */

  	xfs_dir2_sf_entry_t	*ci_sfep;	/* case-insens. entry */

  
  	xfs_dir2_trace_args("sf_lookup", args);
  	xfs_dir2_sf_check(args);
  	dp = args->dp;
  
  	ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
  	/*
  	 * Bail out if the directory is way too short.
  	 */
  	if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
  		ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
  		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));

  	/*
  	 * Special case for .
  	 */
  	if (args->namelen == 1 && args->name[0] == '.') {
  		args->inumber = dp->i_ino;

  		args->cmpresult = XFS_CMP_EXACT;

  		return XFS_ERROR(EEXIST);
  	}
  	/*
  	 * Special case for ..
  	 */
  	if (args->namelen == 2 &&
  	    args->name[0] == '.' && args->name[1] == '.') {

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

  		args->cmpresult = XFS_CMP_EXACT;

  		return XFS_ERROR(EEXIST);
  	}
  	/*
  	 * Loop over all the entries trying to match ours.
  	 */

  	ci_sfep = NULL;

  	for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp); i < sfp->hdr.count;
  				i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep)) {
  		/*
  		 * Compare name and if it's an exact match, return the inode
  		 * number. If it's the first case-insensitive match, store the
  		 * inode number and continue looking for an exact match.
  		 */
  		cmp = dp->i_mount->m_dirnameops->compname(args, sfep->name,
  								sfep->namelen);
  		if (cmp != XFS_CMP_DIFFERENT && cmp != args->cmpresult) {
  			args->cmpresult = cmp;
  			args->inumber = xfs_dir2_sf_get_inumber(sfp,
  						xfs_dir2_sf_inumberp(sfep));
  			if (cmp == XFS_CMP_EXACT)
  				return XFS_ERROR(EEXIST);

  			ci_sfep = sfep;

  		}
  	}

  	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 not found, return ENOENT.

  	 */

  	if (!ci_sfep)
  		return XFS_ERROR(ENOENT);
  	/* otherwise process the CI match as required by the caller */
  	error = xfs_dir_cilookup_result(args, ci_sfep->name, ci_sfep->namelen);
  	return XFS_ERROR(error);

  }
  
  /*
   * Remove an entry from a shortform directory.
   */
  int						/* error */
  xfs_dir2_sf_removename(
  	xfs_da_args_t		*args)
  {
  	int			byteoff;	/* offset of removed entry */
  	xfs_inode_t		*dp;		/* incore directory inode */
  	int			entsize;	/* this entry's size */
  	int			i;		/* shortform entry index */
  	int			newsize;	/* new inode size */
  	int			oldsize;	/* old inode size */
  	xfs_dir2_sf_entry_t	*sfep;		/* shortform directory entry */
  	xfs_dir2_sf_t		*sfp;		/* shortform structure */
  
  	xfs_dir2_trace_args("sf_removename", args);
  	dp = args->dp;
  
  	ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
  	oldsize = (int)dp->i_d.di_size;
  	/*
  	 * Bail out if the directory is way too short.
  	 */
  	if (oldsize < offsetof(xfs_dir2_sf_hdr_t, parent)) {
  		ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
  		return XFS_ERROR(EIO);
  	}
  	ASSERT(dp->i_df.if_bytes == oldsize);
  	ASSERT(dp->i_df.if_u1.if_data != NULL);
  	sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;

  	ASSERT(oldsize >= xfs_dir2_sf_hdr_size(sfp->hdr.i8count));

  	/*
  	 * Loop over the old directory entries.
  	 * Find the one we're deleting.
  	 */

  	for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp); i < sfp->hdr.count;
  				i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep)) {
  		if (xfs_da_compname(args, sfep->name, sfep->namelen) ==
  								XFS_CMP_EXACT) {

  			ASSERT(xfs_dir2_sf_get_inumber(sfp,

  						xfs_dir2_sf_inumberp(sfep)) ==
  								args->inumber);

  			break;
  		}
  	}
  	/*
  	 * Didn't find it.
  	 */

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

  		return XFS_ERROR(ENOENT);

  	/*
  	 * Calculate sizes.
  	 */
  	byteoff = (int)((char *)sfep - (char *)sfp);

  	entsize = xfs_dir2_sf_entsize_byname(sfp, args->namelen);

  	newsize = oldsize - entsize;
  	/*
  	 * Copy the part if any after the removed entry, sliding it down.
  	 */
  	if (byteoff + entsize < oldsize)
  		memmove((char *)sfp + byteoff, (char *)sfp + byteoff + entsize,
  			oldsize - (byteoff + entsize));
  	/*
  	 * Fix up the header and file size.
  	 */
  	sfp->hdr.count--;
  	dp->i_d.di_size = newsize;
  	/*
  	 * Reallocate, making it smaller.
  	 */
  	xfs_idata_realloc(dp, newsize - oldsize, XFS_DATA_FORK);
  	sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
  #if XFS_BIG_INUMS
  	/*
  	 * Are we changing inode number size?
  	 */
  	if (args->inumber > XFS_DIR2_MAX_SHORT_INUM) {
  		if (sfp->hdr.i8count == 1)
  			xfs_dir2_sf_toino4(args);
  		else
  			sfp->hdr.i8count--;
  	}
  #endif
  	xfs_dir2_sf_check(args);
  	xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
  	return 0;
  }
  
  /*
   * Replace the inode number of an entry in a shortform directory.
   */
  int						/* error */
  xfs_dir2_sf_replace(
  	xfs_da_args_t		*args)		/* operation arguments */
  {
  	xfs_inode_t		*dp;		/* incore directory inode */
  	int			i;		/* entry index */
  #if XFS_BIG_INUMS || defined(DEBUG)
  	xfs_ino_t		ino=0;		/* entry old inode number */
  #endif
  #if XFS_BIG_INUMS
  	int			i8elevated;	/* sf_toino8 set i8count=1 */
  #endif
  	xfs_dir2_sf_entry_t	*sfep;		/* shortform directory entry */
  	xfs_dir2_sf_t		*sfp;		/* shortform structure */
  
  	xfs_dir2_trace_args("sf_replace", args);
  	dp = args->dp;
  
  	ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
  	/*
  	 * Bail out if the shortform directory is way too small.
  	 */
  	if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
  		ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
  		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));

  #if XFS_BIG_INUMS
  	/*
  	 * New inode number is large, and need to convert to 8-byte inodes.
  	 */
  	if (args->inumber > XFS_DIR2_MAX_SHORT_INUM && sfp->hdr.i8count == 0) {
  		int	error;			/* error return value */
  		int	newsize;		/* new inode size */
  
  		newsize =
  			dp->i_df.if_bytes +
  			(sfp->hdr.count + 1) *
  			((uint)sizeof(xfs_dir2_ino8_t) -
  			 (uint)sizeof(xfs_dir2_ino4_t));
  		/*
  		 * Won't fit as shortform, convert to block then do replace.
  		 */
  		if (newsize > XFS_IFORK_DSIZE(dp)) {
  			error = xfs_dir2_sf_to_block(args);
  			if (error) {
  				return error;
  			}
  			return xfs_dir2_block_replace(args);
  		}
  		/*
  		 * Still fits, convert to 8-byte now.
  		 */
  		xfs_dir2_sf_toino8(args);
  		i8elevated = 1;
  		sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
  	} else
  		i8elevated = 0;
  #endif
  	ASSERT(args->namelen != 1 || args->name[0] != '.');
  	/*
  	 * Replace ..'s entry.
  	 */
  	if (args->namelen == 2 &&
  	    args->name[0] == '.' && args->name[1] == '.') {
  #if XFS_BIG_INUMS || defined(DEBUG)

  		ino = xfs_dir2_sf_get_inumber(sfp, &sfp->hdr.parent);

  		ASSERT(args->inumber != ino);
  #endif

  		xfs_dir2_sf_put_inumber(sfp, &args->inumber, &sfp->hdr.parent);

  	}
  	/*
  	 * Normal entry, look for the name.
  	 */
  	else {

  		for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp);

  				i < sfp->hdr.count;
  				i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep)) {
  			if (xfs_da_compname(args, sfep->name, sfep->namelen) ==
  								XFS_CMP_EXACT) {

  #if XFS_BIG_INUMS || defined(DEBUG)

  				ino = xfs_dir2_sf_get_inumber(sfp,
  					xfs_dir2_sf_inumberp(sfep));

  				ASSERT(args->inumber != ino);
  #endif

  				xfs_dir2_sf_put_inumber(sfp, &args->inumber,
  					xfs_dir2_sf_inumberp(sfep));

  				break;
  			}
  		}
  		/*
  		 * Didn't find it.
  		 */
  		if (i == sfp->hdr.count) {

  			ASSERT(args->op_flags & XFS_DA_OP_OKNOENT);

  #if XFS_BIG_INUMS
  			if (i8elevated)
  				xfs_dir2_sf_toino4(args);
  #endif
  			return XFS_ERROR(ENOENT);
  		}
  	}
  #if XFS_BIG_INUMS
  	/*
  	 * See if the old number was large, the new number is small.
  	 */
  	if (ino > XFS_DIR2_MAX_SHORT_INUM &&
  	    args->inumber <= XFS_DIR2_MAX_SHORT_INUM) {
  		/*
  		 * And the old count was one, so need to convert to small.
  		 */
  		if (sfp->hdr.i8count == 1)
  			xfs_dir2_sf_toino4(args);
  		else
  			sfp->hdr.i8count--;
  	}
  	/*
  	 * See if the old number was small, the new number is large.
  	 */
  	if (ino <= XFS_DIR2_MAX_SHORT_INUM &&
  	    args->inumber > XFS_DIR2_MAX_SHORT_INUM) {
  		/*
  		 * add to the i8count unless we just converted to 8-byte
  		 * inodes (which does an implied i8count = 1)
  		 */
  		ASSERT(sfp->hdr.i8count != 0);
  		if (!i8elevated)
  			sfp->hdr.i8count++;
  	}
  #endif
  	xfs_dir2_sf_check(args);
  	xfs_trans_log_inode(args->trans, dp, XFS_ILOG_DDATA);
  	return 0;
  }
  
  #if XFS_BIG_INUMS
  /*
   * Convert from 8-byte inode numbers to 4-byte inode numbers.
   * The last 8-byte inode number is gone, but the count is still 1.
   */
  static void
  xfs_dir2_sf_toino4(
  	xfs_da_args_t		*args)		/* operation arguments */
  {
  	char			*buf;		/* old dir's buffer */
  	xfs_inode_t		*dp;		/* incore directory inode */
  	int			i;		/* entry index */
  	xfs_ino_t		ino;		/* entry inode number */
  	int			newsize;	/* new inode size */
  	xfs_dir2_sf_entry_t	*oldsfep;	/* old sf entry */
  	xfs_dir2_sf_t		*oldsfp;	/* old sf directory */
  	int			oldsize;	/* old inode size */
  	xfs_dir2_sf_entry_t	*sfep;		/* new sf entry */
  	xfs_dir2_sf_t		*sfp;		/* new sf directory */
  
  	xfs_dir2_trace_args("sf_toino4", args);
  	dp = args->dp;
  
  	/*
  	 * Copy the old directory to the buffer.
  	 * Then nuke it from the inode, and add the new buffer to the inode.
  	 * Don't want xfs_idata_realloc copying the data here.
  	 */
  	oldsize = dp->i_df.if_bytes;
  	buf = kmem_alloc(oldsize, KM_SLEEP);
  	oldsfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
  	ASSERT(oldsfp->hdr.i8count == 1);
  	memcpy(buf, oldsfp, oldsize);
  	/*
  	 * Compute the new inode size.
  	 */
  	newsize =
  		oldsize -
  		(oldsfp->hdr.count + 1) *
  		((uint)sizeof(xfs_dir2_ino8_t) - (uint)sizeof(xfs_dir2_ino4_t));
  	xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK);
  	xfs_idata_realloc(dp, newsize, XFS_DATA_FORK);
  	/*
  	 * Reset our pointers, the data has moved.
  	 */
  	oldsfp = (xfs_dir2_sf_t *)buf;
  	sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
  	/*
  	 * Fill in the new header.
  	 */
  	sfp->hdr.count = oldsfp->hdr.count;
  	sfp->hdr.i8count = 0;

  	ino = xfs_dir2_sf_get_inumber(oldsfp, &oldsfp->hdr.parent);
  	xfs_dir2_sf_put_inumber(sfp, &ino, &sfp->hdr.parent);

  	/*
  	 * Copy the entries field by field.
  	 */

  	for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp),
  		    oldsfep = xfs_dir2_sf_firstentry(oldsfp);

  	     i < sfp->hdr.count;

  	     i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep),
  		  oldsfep = xfs_dir2_sf_nextentry(oldsfp, oldsfep)) {

  		sfep->namelen = oldsfep->namelen;
  		sfep->offset = oldsfep->offset;
  		memcpy(sfep->name, oldsfep->name, sfep->namelen);

  		ino = xfs_dir2_sf_get_inumber(oldsfp,
  			xfs_dir2_sf_inumberp(oldsfep));
  		xfs_dir2_sf_put_inumber(sfp, &ino, xfs_dir2_sf_inumberp(sfep));

  	}
  	/*
  	 * Clean up the inode.
  	 */

  	kmem_free(buf);

  	dp->i_d.di_size = newsize;
  	xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
  }
  
  /*
   * Convert from 4-byte inode numbers to 8-byte inode numbers.
   * The new 8-byte inode number is not there yet, we leave with the
   * count 1 but no corresponding entry.
   */
  static void
  xfs_dir2_sf_toino8(
  	xfs_da_args_t		*args)		/* operation arguments */
  {
  	char			*buf;		/* old dir's buffer */
  	xfs_inode_t		*dp;		/* incore directory inode */
  	int			i;		/* entry index */
  	xfs_ino_t		ino;		/* entry inode number */
  	int			newsize;	/* new inode size */
  	xfs_dir2_sf_entry_t	*oldsfep;	/* old sf entry */
  	xfs_dir2_sf_t		*oldsfp;	/* old sf directory */
  	int			oldsize;	/* old inode size */
  	xfs_dir2_sf_entry_t	*sfep;		/* new sf entry */
  	xfs_dir2_sf_t		*sfp;		/* new sf directory */
  
  	xfs_dir2_trace_args("sf_toino8", args);
  	dp = args->dp;
  
  	/*
  	 * Copy the old directory to the buffer.
  	 * Then nuke it from the inode, and add the new buffer to the inode.
  	 * Don't want xfs_idata_realloc copying the data here.
  	 */
  	oldsize = dp->i_df.if_bytes;
  	buf = kmem_alloc(oldsize, KM_SLEEP);
  	oldsfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
  	ASSERT(oldsfp->hdr.i8count == 0);
  	memcpy(buf, oldsfp, oldsize);
  	/*
  	 * Compute the new inode size.
  	 */
  	newsize =
  		oldsize +
  		(oldsfp->hdr.count + 1) *
  		((uint)sizeof(xfs_dir2_ino8_t) - (uint)sizeof(xfs_dir2_ino4_t));
  	xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK);
  	xfs_idata_realloc(dp, newsize, XFS_DATA_FORK);
  	/*
  	 * Reset our pointers, the data has moved.
  	 */
  	oldsfp = (xfs_dir2_sf_t *)buf;
  	sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
  	/*
  	 * Fill in the new header.
  	 */
  	sfp->hdr.count = oldsfp->hdr.count;
  	sfp->hdr.i8count = 1;

  	ino = xfs_dir2_sf_get_inumber(oldsfp, &oldsfp->hdr.parent);
  	xfs_dir2_sf_put_inumber(sfp, &ino, &sfp->hdr.parent);

  	/*
  	 * Copy the entries field by field.
  	 */

  	for (i = 0, sfep = xfs_dir2_sf_firstentry(sfp),
  		    oldsfep = xfs_dir2_sf_firstentry(oldsfp);

  	     i < sfp->hdr.count;

  	     i++, sfep = xfs_dir2_sf_nextentry(sfp, sfep),
  		  oldsfep = xfs_dir2_sf_nextentry(oldsfp, oldsfep)) {

  		sfep->namelen = oldsfep->namelen;
  		sfep->offset = oldsfep->offset;
  		memcpy(sfep->name, oldsfep->name, sfep->namelen);

  		ino = xfs_dir2_sf_get_inumber(oldsfp,
  			xfs_dir2_sf_inumberp(oldsfep));
  		xfs_dir2_sf_put_inumber(sfp, &ino, xfs_dir2_sf_inumberp(sfep));

  	}
  	/*
  	 * Clean up the inode.
  	 */

  	kmem_free(buf);

  	dp->i_d.di_size = newsize;
  	xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
  }
  #endif	/* XFS_BIG_INUMS */