/*

   * Copyright (c) 2000-2005 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_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_dmapi.h"
  #include "xfs_mount.h"

  #include "xfs_da_btree.h"

  #include "xfs_bmap_btree.h"

  #include "xfs_alloc_btree.h"

  #include "xfs_ialloc_btree.h"
  #include "xfs_alloc.h"
  #include "xfs_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_bmap.h"

  #include "xfs_attr.h"
  #include "xfs_attr_leaf.h"
  #include "xfs_error.h"

  
  /*
   * xfs_attr_leaf.c
   *
   * Routines to implement leaf blocks of attributes as Btrees of hashed names.
   */
  
  /*========================================================================
   * Function prototypes for the kernel.
   *========================================================================*/
  
  /*
   * Routines used for growing the Btree.
   */

  STATIC int xfs_attr_leaf_create(xfs_da_args_t *args, xfs_dablk_t which_block,
  				    xfs_dabuf_t **bpp);

  STATIC int xfs_attr_leaf_add_work(xfs_dabuf_t *leaf_buffer, xfs_da_args_t *args,
  					      int freemap_index);
  STATIC void xfs_attr_leaf_compact(xfs_trans_t *trans, xfs_dabuf_t *leaf_buffer);
  STATIC void xfs_attr_leaf_rebalance(xfs_da_state_t *state,
  						   xfs_da_state_blk_t *blk1,
  						   xfs_da_state_blk_t *blk2);
  STATIC int xfs_attr_leaf_figure_balance(xfs_da_state_t *state,
  					   xfs_da_state_blk_t *leaf_blk_1,
  					   xfs_da_state_blk_t *leaf_blk_2,
  					   int *number_entries_in_blk1,
  					   int *number_usedbytes_in_blk1);
  
  /*

   * Routines used for shrinking the Btree.
   */
  STATIC int xfs_attr_node_inactive(xfs_trans_t **trans, xfs_inode_t *dp,
  				  xfs_dabuf_t *bp, int level);
  STATIC int xfs_attr_leaf_inactive(xfs_trans_t **trans, xfs_inode_t *dp,
  				  xfs_dabuf_t *bp);
  STATIC int xfs_attr_leaf_freextent(xfs_trans_t **trans, xfs_inode_t *dp,
  				   xfs_dablk_t blkno, int blkcnt);
  
  /*

   * Utility routines.
   */
  STATIC void xfs_attr_leaf_moveents(xfs_attr_leafblock_t *src_leaf,
  					 int src_start,
  					 xfs_attr_leafblock_t *dst_leaf,
  					 int dst_start, int move_count,
  					 xfs_mount_t *mp);

  STATIC int xfs_attr_leaf_entsize(xfs_attr_leafblock_t *leaf, int index);

  
  /*========================================================================
   * Namespace helper routines
   *========================================================================*/

  STATIC_INLINE attrnames_t *

  xfs_attr_flags_namesp(int flags)
  {
  	return ((flags & XFS_ATTR_SECURE) ? &attr_secure:
  		  ((flags & XFS_ATTR_ROOT) ? &attr_trusted : &attr_user));
  }
  
  /*
   * If namespace bits don't match return 0.
   * If all match then return 1.
   */

  STATIC_INLINE int

  xfs_attr_namesp_match(int arg_flags, int ondisk_flags)
  {
  	return XFS_ATTR_NSP_ONDISK(ondisk_flags) == XFS_ATTR_NSP_ARGS_TO_ONDISK(arg_flags);
  }
  
  /*
   * If namespace bits don't match and we don't have an override for it
   * then return 0.
   * If all match or are overridable then return 1.
   */

  STATIC_INLINE int

  xfs_attr_namesp_match_overrides(int arg_flags, int ondisk_flags)
  {
  	if (((arg_flags & ATTR_SECURE) == 0) !=
  	    ((ondisk_flags & XFS_ATTR_SECURE) == 0) &&
  	    !(arg_flags & ATTR_KERNORMALS))
  		return 0;
  	if (((arg_flags & ATTR_ROOT) == 0) !=
  	    ((ondisk_flags & XFS_ATTR_ROOT) == 0) &&
  	    !(arg_flags & ATTR_KERNROOTLS))
  		return 0;
  	return 1;
  }

  
  
  /*========================================================================

   * External routines when attribute fork size < XFS_LITINO(mp).

   *========================================================================*/
  
  /*

   * Query whether the requested number of additional bytes of extended
   * attribute space will be able to fit inline.
   * Returns zero if not, else the di_forkoff fork offset to be used in the
   * literal area for attribute data once the new bytes have been added.
   *
   * di_forkoff must be 8 byte aligned, hence is stored as a >>3 value;
   * special case for dev/uuid inodes, they have fixed size data forks.

   */
  int

  xfs_attr_shortform_bytesfit(xfs_inode_t *dp, int bytes)
  {
  	int offset;
  	int minforkoff;	/* lower limit on valid forkoff locations */
  	int maxforkoff;	/* upper limit on valid forkoff locations */

  	int dsize;	

  	xfs_mount_t *mp = dp->i_mount;

  	offset = (XFS_LITINO(mp) - bytes) >> 3; /* rounded down */
  
  	switch (dp->i_d.di_format) {
  	case XFS_DINODE_FMT_DEV:
  		minforkoff = roundup(sizeof(xfs_dev_t), 8) >> 3;
  		return (offset >= minforkoff) ? minforkoff : 0;
  	case XFS_DINODE_FMT_UUID:
  		minforkoff = roundup(sizeof(uuid_t), 8) >> 3;
  		return (offset >= minforkoff) ? minforkoff : 0;
  	}

  	if (!(mp->m_flags & XFS_MOUNT_ATTR2)) {

  		if (bytes <= XFS_IFORK_ASIZE(dp))
  			return mp->m_attroffset >> 3;
  		return 0;
  	}

  	dsize = dp->i_df.if_bytes;
  	
  	switch (dp->i_d.di_format) {
  	case XFS_DINODE_FMT_EXTENTS:
  		/* 
  		 * If there is no attr fork and the data fork is extents, 
  		 * determine if creating the default attr fork will result 
  		 * in the extents form migrating to btree. If so, the 
  		 * minimum offset only needs to be the space required for 
  		 * the btree root.
  		 */ 
  		if (!dp->i_d.di_forkoff && dp->i_df.if_bytes > mp->m_attroffset)
  			dsize = XFS_BMDR_SPACE_CALC(MINDBTPTRS);
  		break;
  		
  	case XFS_DINODE_FMT_BTREE:
  		/*
  		 * If have data btree then keep forkoff if we have one,
  		 * otherwise we are adding a new attr, so then we set 
  		 * minforkoff to where the btree root can finish so we have 
  		 * plenty of room for attrs
  		 */
  		if (dp->i_d.di_forkoff) {
  			if (offset < dp->i_d.di_forkoff) 
  				return 0;
  			else 
  				return dp->i_d.di_forkoff;
  		} else
  			dsize = XFS_BMAP_BROOT_SPACE(dp->i_df.if_broot);
  		break;
  	}
  	
  	/* 
  	 * A data fork btree root must have space for at least 
  	 * MINDBTPTRS key/ptr pairs if the data fork is small or empty.
  	 */
  	minforkoff = MAX(dsize, XFS_BMDR_SPACE_CALC(MINDBTPTRS));

  	minforkoff = roundup(minforkoff, 8) >> 3;
  
  	/* attr fork btree root can have at least this many key/ptr pairs */
  	maxforkoff = XFS_LITINO(mp) - XFS_BMDR_SPACE_CALC(MINABTPTRS);
  	maxforkoff = maxforkoff >> 3;	/* rounded down */
  
  	if (offset >= minforkoff && offset < maxforkoff)
  		return offset;
  	if (offset >= maxforkoff)
  		return maxforkoff;
  	return 0;
  }
  
  /*
   * Switch on the ATTR2 superblock bit (implies also FEATURES2)
   */
  STATIC void
  xfs_sbversion_add_attr2(xfs_mount_t *mp, xfs_trans_t *tp)
  {
  	unsigned long s;

  	if ((mp->m_flags & XFS_MOUNT_ATTR2) &&

  	    !(XFS_SB_VERSION_HASATTR2(&mp->m_sb))) {
  		s = XFS_SB_LOCK(mp);
  		if (!XFS_SB_VERSION_HASATTR2(&mp->m_sb)) {
  			XFS_SB_VERSION_ADDATTR2(&mp->m_sb);
  			XFS_SB_UNLOCK(mp, s);
  			xfs_mod_sb(tp, XFS_SB_VERSIONNUM | XFS_SB_FEATURES2);
  		} else
  			XFS_SB_UNLOCK(mp, s);
  	}
  }
  
  /*
   * Create the initial contents of a shortform attribute list.
   */
  void

  xfs_attr_shortform_create(xfs_da_args_t *args)
  {
  	xfs_attr_sf_hdr_t *hdr;
  	xfs_inode_t *dp;
  	xfs_ifork_t *ifp;
  
  	dp = args->dp;
  	ASSERT(dp != NULL);
  	ifp = dp->i_afp;
  	ASSERT(ifp != NULL);
  	ASSERT(ifp->if_bytes == 0);
  	if (dp->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS) {
  		ifp->if_flags &= ~XFS_IFEXTENTS;	/* just in case */
  		dp->i_d.di_aformat = XFS_DINODE_FMT_LOCAL;
  		ifp->if_flags |= XFS_IFINLINE;
  	} else {
  		ASSERT(ifp->if_flags & XFS_IFINLINE);
  	}
  	xfs_idata_realloc(dp, sizeof(*hdr), XFS_ATTR_FORK);
  	hdr = (xfs_attr_sf_hdr_t *)ifp->if_u1.if_data;
  	hdr->count = 0;

  	hdr->totsize = cpu_to_be16(sizeof(*hdr));

  	xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_ADATA);

  }
  
  /*
   * Add a name/value pair to the shortform attribute list.
   * Overflow from the inode has already been checked for.
   */

  void
  xfs_attr_shortform_add(xfs_da_args_t *args, int forkoff)

  {
  	xfs_attr_shortform_t *sf;
  	xfs_attr_sf_entry_t *sfe;
  	int i, offset, size;

  	xfs_mount_t *mp;

  	xfs_inode_t *dp;
  	xfs_ifork_t *ifp;
  
  	dp = args->dp;

  	mp = dp->i_mount;
  	dp->i_d.di_forkoff = forkoff;
  	dp->i_df.if_ext_max =
  		XFS_IFORK_DSIZE(dp) / (uint)sizeof(xfs_bmbt_rec_t);
  	dp->i_afp->if_ext_max =
  		XFS_IFORK_ASIZE(dp) / (uint)sizeof(xfs_bmbt_rec_t);

  	ifp = dp->i_afp;
  	ASSERT(ifp->if_flags & XFS_IFINLINE);
  	sf = (xfs_attr_shortform_t *)ifp->if_u1.if_data;
  	sfe = &sf->list[0];

  	for (i = 0; i < sf->hdr.count; sfe = XFS_ATTR_SF_NEXTENTRY(sfe), i++) {

  #ifdef DEBUG

  		if (sfe->namelen != args->namelen)
  			continue;
  		if (memcmp(args->name, sfe->nameval, args->namelen) != 0)
  			continue;

  		if (!xfs_attr_namesp_match(args->flags, sfe->flags))

  			continue;

  		ASSERT(0);
  #endif

  	}
  
  	offset = (char *)sfe - (char *)sf;
  	size = XFS_ATTR_SF_ENTSIZE_BYNAME(args->namelen, args->valuelen);
  	xfs_idata_realloc(dp, size, XFS_ATTR_FORK);
  	sf = (xfs_attr_shortform_t *)ifp->if_u1.if_data;
  	sfe = (xfs_attr_sf_entry_t *)((char *)sf + offset);
  
  	sfe->namelen = args->namelen;

  	sfe->valuelen = args->valuelen;

  	sfe->flags = XFS_ATTR_NSP_ARGS_TO_ONDISK(args->flags);

  	memcpy(sfe->nameval, args->name, args->namelen);
  	memcpy(&sfe->nameval[args->namelen], args->value, args->valuelen);

  	sf->hdr.count++;
  	be16_add(&sf->hdr.totsize, size);

  	xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_ADATA);

  	xfs_sbversion_add_attr2(mp, args->trans);

  }
  
  /*

   * Remove an attribute from the shortform attribute list structure.

   */
  int
  xfs_attr_shortform_remove(xfs_da_args_t *args)
  {
  	xfs_attr_shortform_t *sf;
  	xfs_attr_sf_entry_t *sfe;
  	int base, size=0, end, totsize, i;

  	xfs_mount_t *mp;

  	xfs_inode_t *dp;

  	dp = args->dp;

  	mp = dp->i_mount;

  	base = sizeof(xfs_attr_sf_hdr_t);
  	sf = (xfs_attr_shortform_t *)dp->i_afp->if_u1.if_data;
  	sfe = &sf->list[0];

  	end = sf->hdr.count;

  	for (i = 0; i < end; sfe = XFS_ATTR_SF_NEXTENTRY(sfe),

  					base += size, i++) {
  		size = XFS_ATTR_SF_ENTSIZE(sfe);
  		if (sfe->namelen != args->namelen)
  			continue;
  		if (memcmp(sfe->nameval, args->name, args->namelen) != 0)
  			continue;

  		if (!xfs_attr_namesp_match(args->flags, sfe->flags))

  			continue;
  		break;
  	}

  	if (i == end)

  		return(XFS_ERROR(ENOATTR));

  	/*
  	 * Fix up the attribute fork data, covering the hole
  	 */

  	end = base + size;

  	totsize = be16_to_cpu(sf->hdr.totsize);

  	if (end != totsize)
  		memmove(&((char *)sf)[base], &((char *)sf)[end], totsize - end);

  	sf->hdr.count--;
  	be16_add(&sf->hdr.totsize, -size);

  
  	/*
  	 * Fix up the start offset of the attribute fork
  	 */
  	totsize -= size;

  	if (totsize == sizeof(xfs_attr_sf_hdr_t) && !args->addname &&

  	    (mp->m_flags & XFS_MOUNT_ATTR2) && 
  	    (dp->i_d.di_format != XFS_DINODE_FMT_BTREE)) {

  		/*
  		 * Last attribute now removed, revert to original
  		 * inode format making all literal area available
  		 * to the data fork once more.
  		 */
  		xfs_idestroy_fork(dp, XFS_ATTR_FORK);
  		dp->i_d.di_forkoff = 0;
  		dp->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS;
  		ASSERT(dp->i_d.di_anextents == 0);
  		ASSERT(dp->i_afp == NULL);
  		dp->i_df.if_ext_max =
  			XFS_IFORK_DSIZE(dp) / (uint)sizeof(xfs_bmbt_rec_t);
  		xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
  	} else {
  		xfs_idata_realloc(dp, -size, XFS_ATTR_FORK);
  		dp->i_d.di_forkoff = xfs_attr_shortform_bytesfit(dp, totsize);
  		ASSERT(dp->i_d.di_forkoff);

  		ASSERT(totsize > sizeof(xfs_attr_sf_hdr_t) || args->addname ||

  			!(mp->m_flags & XFS_MOUNT_ATTR2) ||
  			dp->i_d.di_format == XFS_DINODE_FMT_BTREE);

  		dp->i_afp->if_ext_max =
  			XFS_IFORK_ASIZE(dp) / (uint)sizeof(xfs_bmbt_rec_t);
  		dp->i_df.if_ext_max =
  			XFS_IFORK_DSIZE(dp) / (uint)sizeof(xfs_bmbt_rec_t);
  		xfs_trans_log_inode(args->trans, dp,
  					XFS_ILOG_CORE | XFS_ILOG_ADATA);
  	}
  
  	xfs_sbversion_add_attr2(mp, args->trans);

  
  	return(0);
  }
  
  /*
   * Look up a name in a shortform attribute list structure.
   */
  /*ARGSUSED*/
  int
  xfs_attr_shortform_lookup(xfs_da_args_t *args)
  {
  	xfs_attr_shortform_t *sf;
  	xfs_attr_sf_entry_t *sfe;
  	int i;
  	xfs_ifork_t *ifp;
  
  	ifp = args->dp->i_afp;
  	ASSERT(ifp->if_flags & XFS_IFINLINE);
  	sf = (xfs_attr_shortform_t *)ifp->if_u1.if_data;
  	sfe = &sf->list[0];

  	for (i = 0; i < sf->hdr.count;

  				sfe = XFS_ATTR_SF_NEXTENTRY(sfe), i++) {
  		if (sfe->namelen != args->namelen)
  			continue;
  		if (memcmp(args->name, sfe->nameval, args->namelen) != 0)
  			continue;

  		if (!xfs_attr_namesp_match(args->flags, sfe->flags))

  			continue;
  		return(XFS_ERROR(EEXIST));
  	}
  	return(XFS_ERROR(ENOATTR));
  }
  
  /*
   * Look up a name in a shortform attribute list structure.
   */
  /*ARGSUSED*/
  int
  xfs_attr_shortform_getvalue(xfs_da_args_t *args)
  {
  	xfs_attr_shortform_t *sf;
  	xfs_attr_sf_entry_t *sfe;
  	int i;
  
  	ASSERT(args->dp->i_d.di_aformat == XFS_IFINLINE);
  	sf = (xfs_attr_shortform_t *)args->dp->i_afp->if_u1.if_data;
  	sfe = &sf->list[0];

  	for (i = 0; i < sf->hdr.count;

  				sfe = XFS_ATTR_SF_NEXTENTRY(sfe), i++) {
  		if (sfe->namelen != args->namelen)
  			continue;
  		if (memcmp(args->name, sfe->nameval, args->namelen) != 0)
  			continue;

  		if (!xfs_attr_namesp_match(args->flags, sfe->flags))

  			continue;
  		if (args->flags & ATTR_KERNOVAL) {

  			args->valuelen = sfe->valuelen;

  			return(XFS_ERROR(EEXIST));
  		}

  		if (args->valuelen < sfe->valuelen) {
  			args->valuelen = sfe->valuelen;

  			return(XFS_ERROR(ERANGE));
  		}

  		args->valuelen = sfe->valuelen;

  		memcpy(args->value, &sfe->nameval[args->namelen],
  						    args->valuelen);
  		return(XFS_ERROR(EEXIST));
  	}
  	return(XFS_ERROR(ENOATTR));
  }
  
  /*
   * Convert from using the shortform to the leaf.
   */
  int
  xfs_attr_shortform_to_leaf(xfs_da_args_t *args)
  {
  	xfs_inode_t *dp;
  	xfs_attr_shortform_t *sf;
  	xfs_attr_sf_entry_t *sfe;
  	xfs_da_args_t nargs;
  	char *tmpbuffer;
  	int error, i, size;
  	xfs_dablk_t blkno;
  	xfs_dabuf_t *bp;
  	xfs_ifork_t *ifp;
  
  	dp = args->dp;
  	ifp = dp->i_afp;
  	sf = (xfs_attr_shortform_t *)ifp->if_u1.if_data;

  	size = be16_to_cpu(sf->hdr.totsize);

  	tmpbuffer = kmem_alloc(size, KM_SLEEP);
  	ASSERT(tmpbuffer != NULL);
  	memcpy(tmpbuffer, ifp->if_u1.if_data, size);
  	sf = (xfs_attr_shortform_t *)tmpbuffer;
  
  	xfs_idata_realloc(dp, -size, XFS_ATTR_FORK);
  	bp = NULL;
  	error = xfs_da_grow_inode(args, &blkno);
  	if (error) {
  		/*
  		 * If we hit an IO error middle of the transaction inside
  		 * grow_inode(), we may have inconsistent data. Bail out.
  		 */
  		if (error == EIO)
  			goto out;
  		xfs_idata_realloc(dp, size, XFS_ATTR_FORK);	/* try to put */
  		memcpy(ifp->if_u1.if_data, tmpbuffer, size);	/* it back */
  		goto out;
  	}
  
  	ASSERT(blkno == 0);
  	error = xfs_attr_leaf_create(args, blkno, &bp);
  	if (error) {
  		error = xfs_da_shrink_inode(args, 0, bp);
  		bp = NULL;
  		if (error)
  			goto out;
  		xfs_idata_realloc(dp, size, XFS_ATTR_FORK);	/* try to put */
  		memcpy(ifp->if_u1.if_data, tmpbuffer, size);	/* it back */
  		goto out;
  	}
  
  	memset((char *)&nargs, 0, sizeof(nargs));
  	nargs.dp = dp;
  	nargs.firstblock = args->firstblock;
  	nargs.flist = args->flist;
  	nargs.total = args->total;
  	nargs.whichfork = XFS_ATTR_FORK;
  	nargs.trans = args->trans;
  	nargs.oknoent = 1;
  
  	sfe = &sf->list[0];

  	for (i = 0; i < sf->hdr.count; i++) {

  		nargs.name = (char *)sfe->nameval;
  		nargs.namelen = sfe->namelen;
  		nargs.value = (char *)&sfe->nameval[nargs.namelen];

  		nargs.valuelen = sfe->valuelen;

  		nargs.hashval = xfs_da_hashname((char *)sfe->nameval,
  						sfe->namelen);

  		nargs.flags = XFS_ATTR_NSP_ONDISK_TO_ARGS(sfe->flags);

  		error = xfs_attr_leaf_lookup_int(bp, &nargs); /* set a->index */
  		ASSERT(error == ENOATTR);
  		error = xfs_attr_leaf_add(bp, &nargs);
  		ASSERT(error != ENOSPC);
  		if (error)
  			goto out;
  		sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
  	}
  	error = 0;
  
  out:
  	if(bp)
  		xfs_da_buf_done(bp);
  	kmem_free(tmpbuffer, size);
  	return(error);
  }
  
  STATIC int
  xfs_attr_shortform_compare(const void *a, const void *b)
  {
  	xfs_attr_sf_sort_t *sa, *sb;
  
  	sa = (xfs_attr_sf_sort_t *)a;
  	sb = (xfs_attr_sf_sort_t *)b;

  	if (sa->hash < sb->hash) {

  		return(-1);

  	} else if (sa->hash > sb->hash) {

  		return(1);
  	} else {
  		return(sa->entno - sb->entno);
  	}
  }

  
  #define XFS_ISRESET_CURSOR(cursor) \
  	(!((cursor)->initted) && !((cursor)->hashval) && \
  	 !((cursor)->blkno) && !((cursor)->offset))

  /*
   * Copy out entries of shortform attribute lists for attr_list().

   * Shortform attribute lists are not stored in hashval sorted order.

   * If the output buffer is not large enough to hold them all, then we
   * we have to calculate each entries' hashvalue and sort them before
   * we can begin returning them to the user.
   */
  /*ARGSUSED*/
  int
  xfs_attr_shortform_list(xfs_attr_list_context_t *context)
  {
  	attrlist_cursor_kern_t *cursor;
  	xfs_attr_sf_sort_t *sbuf, *sbp;
  	xfs_attr_shortform_t *sf;
  	xfs_attr_sf_entry_t *sfe;
  	xfs_inode_t *dp;
  	int sbsize, nsbuf, count, i;

  	int error;

  
  	ASSERT(context != NULL);
  	dp = context->dp;
  	ASSERT(dp != NULL);
  	ASSERT(dp->i_afp != NULL);
  	sf = (xfs_attr_shortform_t *)dp->i_afp->if_u1.if_data;
  	ASSERT(sf != NULL);
  	if (!sf->hdr.count)
  		return(0);
  	cursor = context->cursor;
  	ASSERT(cursor != NULL);
  
  	xfs_attr_trace_l_c("sf start", context);
  
  	/*

  	 * If the buffer is large enough and the cursor is at the start,
  	 * do not bother with sorting since we will return everything in
  	 * one buffer and another call using the cursor won't need to be
  	 * made.

  	 * Note the generous fudge factor of 16 overhead bytes per entry.

  	 * If bufsize is zero then put_listent must be a search function
  	 * and can just scan through what we have.

  	 */

  	if (context->bufsize == 0 ||
  	    (XFS_ISRESET_CURSOR(cursor) &&
               (dp->i_afp->if_bytes + sf->hdr.count * 16) < context->bufsize)) {

  		for (i = 0, sfe = &sf->list[0]; i < sf->hdr.count; i++) {

  			attrnames_t	*namesp;

  			if (!xfs_attr_namesp_match_overrides(context->flags, sfe->flags)) {

  				sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
  				continue;
  			}

  			namesp = xfs_attr_flags_namesp(sfe->flags);
  			error = context->put_listent(context,
  					   namesp,
  					   (char *)sfe->nameval,
  					   (int)sfe->namelen,
  					   (int)sfe->valuelen,
  					   (char*)&sfe->nameval[sfe->namelen]);
  
  			/*
  			 * Either search callback finished early or
  			 * didn't fit it all in the buffer after all.
  			 */
  			if (context->seen_enough)
  				break;
  
  			if (error)
  				return error;

  			sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
  		}
  		xfs_attr_trace_l_c("sf big-gulp", context);
  		return(0);
  	}

  	/* do no more for a search callback */
  	if (context->bufsize == 0)
  		return 0;

  	/*
  	 * It didn't all fit, so we have to sort everything on hashval.
  	 */

  	sbsize = sf->hdr.count * sizeof(*sbuf);

  	sbp = sbuf = kmem_alloc(sbsize, KM_SLEEP);
  
  	/*
  	 * Scan the attribute list for the rest of the entries, storing
  	 * the relevant info from only those that match into a buffer.
  	 */
  	nsbuf = 0;

  	for (i = 0, sfe = &sf->list[0]; i < sf->hdr.count; i++) {

  		if (unlikely(
  		    ((char *)sfe < (char *)sf) ||
  		    ((char *)sfe >= ((char *)sf + dp->i_afp->if_bytes)))) {
  			XFS_CORRUPTION_ERROR("xfs_attr_shortform_list",
  					     XFS_ERRLEVEL_LOW,
  					     context->dp->i_mount, sfe);
  			xfs_attr_trace_l_c("sf corrupted", context);
  			kmem_free(sbuf, sbsize);
  			return XFS_ERROR(EFSCORRUPTED);
  		}

  		if (!xfs_attr_namesp_match_overrides(context->flags, sfe->flags)) {

  			sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
  			continue;
  		}
  		sbp->entno = i;

  		sbp->hash = xfs_da_hashname((char *)sfe->nameval, sfe->namelen);

  		sbp->name = (char *)sfe->nameval;
  		sbp->namelen = sfe->namelen;
  		/* These are bytes, and both on-disk, don't endian-flip */
  		sbp->valuelen = sfe->valuelen;
  		sbp->flags = sfe->flags;
  		sfe = XFS_ATTR_SF_NEXTENTRY(sfe);
  		sbp++;
  		nsbuf++;
  	}
  
  	/*
  	 * Sort the entries on hash then entno.
  	 */

  	xfs_sort(sbuf, nsbuf, sizeof(*sbuf), xfs_attr_shortform_compare);

  
  	/*
  	 * Re-find our place IN THE SORTED LIST.
  	 */
  	count = 0;
  	cursor->initted = 1;
  	cursor->blkno = 0;
  	for (sbp = sbuf, i = 0; i < nsbuf; i++, sbp++) {

  		if (sbp->hash == cursor->hashval) {

  			if (cursor->offset == count) {
  				break;
  			}
  			count++;

  		} else if (sbp->hash > cursor->hashval) {

  			break;
  		}
  	}
  	if (i == nsbuf) {
  		kmem_free(sbuf, sbsize);
  		xfs_attr_trace_l_c("blk end", context);
  		return(0);
  	}
  
  	/*
  	 * Loop putting entries into the user buffer.
  	 */
  	for ( ; i < nsbuf; i++, sbp++) {
  		attrnames_t	*namesp;

  		namesp = xfs_attr_flags_namesp(sbp->flags);

  		if (cursor->hashval != sbp->hash) {
  			cursor->hashval = sbp->hash;

  			cursor->offset = 0;
  		}

  		error = context->put_listent(context,
  					namesp,
  					sbp->name,
  					sbp->namelen,
  					sbp->valuelen,
  					&sbp->name[sbp->namelen]);
  		if (error)
  			return error;
  		if (context->seen_enough)
  			break;

  		cursor->offset++;
  	}
  
  	kmem_free(sbuf, sbsize);
  	xfs_attr_trace_l_c("sf E-O-F", context);
  	return(0);
  }
  
  /*
   * Check a leaf attribute block to see if all the entries would fit into
   * a shortform attribute list.
   */
  int
  xfs_attr_shortform_allfit(xfs_dabuf_t *bp, xfs_inode_t *dp)
  {
  	xfs_attr_leafblock_t *leaf;
  	xfs_attr_leaf_entry_t *entry;
  	xfs_attr_leaf_name_local_t *name_loc;
  	int bytes, i;
  
  	leaf = bp->data;

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

  
  	entry = &leaf->entries[0];
  	bytes = sizeof(struct xfs_attr_sf_hdr);

  	for (i = 0; i < be16_to_cpu(leaf->hdr.count); entry++, i++) {

  		if (entry->flags & XFS_ATTR_INCOMPLETE)
  			continue;		/* don't copy partial entries */
  		if (!(entry->flags & XFS_ATTR_LOCAL))
  			return(0);
  		name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, i);
  		if (name_loc->namelen >= XFS_ATTR_SF_ENTSIZE_MAX)
  			return(0);

  		if (be16_to_cpu(name_loc->valuelen) >= XFS_ATTR_SF_ENTSIZE_MAX)

  			return(0);
  		bytes += sizeof(struct xfs_attr_sf_entry)-1
  				+ name_loc->namelen

  				+ be16_to_cpu(name_loc->valuelen);

  	}

  	if ((dp->i_mount->m_flags & XFS_MOUNT_ATTR2) &&

  	    (dp->i_d.di_format != XFS_DINODE_FMT_BTREE) &&

  	    (bytes == sizeof(struct xfs_attr_sf_hdr)))

  		return(-1);
  	return(xfs_attr_shortform_bytesfit(dp, bytes));

  }
  
  /*
   * Convert a leaf attribute list to shortform attribute list
   */
  int

  xfs_attr_leaf_to_shortform(xfs_dabuf_t *bp, xfs_da_args_t *args, int forkoff)

  {
  	xfs_attr_leafblock_t *leaf;
  	xfs_attr_leaf_entry_t *entry;
  	xfs_attr_leaf_name_local_t *name_loc;
  	xfs_da_args_t nargs;
  	xfs_inode_t *dp;
  	char *tmpbuffer;
  	int error, i;
  
  	dp = args->dp;
  	tmpbuffer = kmem_alloc(XFS_LBSIZE(dp->i_mount), KM_SLEEP);
  	ASSERT(tmpbuffer != NULL);
  
  	ASSERT(bp != NULL);
  	memcpy(tmpbuffer, bp->data, XFS_LBSIZE(dp->i_mount));
  	leaf = (xfs_attr_leafblock_t *)tmpbuffer;

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

  	memset(bp->data, 0, XFS_LBSIZE(dp->i_mount));
  
  	/*
  	 * Clean out the prior contents of the attribute list.
  	 */
  	error = xfs_da_shrink_inode(args, 0, bp);
  	if (error)
  		goto out;

  
  	if (forkoff == -1) {

  		ASSERT(dp->i_mount->m_flags & XFS_MOUNT_ATTR2);

  		ASSERT(dp->i_d.di_format != XFS_DINODE_FMT_BTREE);

  		/*
  		 * Last attribute was removed, revert to original
  		 * inode format making all literal area available
  		 * to the data fork once more.
  		 */
  		xfs_idestroy_fork(dp, XFS_ATTR_FORK);
  		dp->i_d.di_forkoff = 0;
  		dp->i_d.di_aformat = XFS_DINODE_FMT_EXTENTS;
  		ASSERT(dp->i_d.di_anextents == 0);
  		ASSERT(dp->i_afp == NULL);
  		dp->i_df.if_ext_max =
  			XFS_IFORK_DSIZE(dp) / (uint)sizeof(xfs_bmbt_rec_t);
  		xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);

  		goto out;

  	}
  
  	xfs_attr_shortform_create(args);

  
  	/*
  	 * Copy the attributes
  	 */
  	memset((char *)&nargs, 0, sizeof(nargs));
  	nargs.dp = dp;
  	nargs.firstblock = args->firstblock;
  	nargs.flist = args->flist;
  	nargs.total = args->total;
  	nargs.whichfork = XFS_ATTR_FORK;
  	nargs.trans = args->trans;
  	nargs.oknoent = 1;
  	entry = &leaf->entries[0];

  	for (i = 0; i < be16_to_cpu(leaf->hdr.count); entry++, i++) {

  		if (entry->flags & XFS_ATTR_INCOMPLETE)
  			continue;	/* don't copy partial entries */
  		if (!entry->nameidx)
  			continue;
  		ASSERT(entry->flags & XFS_ATTR_LOCAL);
  		name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, i);
  		nargs.name = (char *)name_loc->nameval;
  		nargs.namelen = name_loc->namelen;
  		nargs.value = (char *)&name_loc->nameval[nargs.namelen];

  		nargs.valuelen = be16_to_cpu(name_loc->valuelen);

  		nargs.hashval = be32_to_cpu(entry->hashval);

  		nargs.flags = XFS_ATTR_NSP_ONDISK_TO_ARGS(entry->flags);

  		xfs_attr_shortform_add(&nargs, forkoff);

  	}
  	error = 0;
  
  out:
  	kmem_free(tmpbuffer, XFS_LBSIZE(dp->i_mount));
  	return(error);
  }
  
  /*
   * Convert from using a single leaf to a root node and a leaf.
   */
  int
  xfs_attr_leaf_to_node(xfs_da_args_t *args)
  {
  	xfs_attr_leafblock_t *leaf;
  	xfs_da_intnode_t *node;
  	xfs_inode_t *dp;
  	xfs_dabuf_t *bp1, *bp2;
  	xfs_dablk_t blkno;
  	int error;
  
  	dp = args->dp;
  	bp1 = bp2 = NULL;
  	error = xfs_da_grow_inode(args, &blkno);
  	if (error)
  		goto out;
  	error = xfs_da_read_buf(args->trans, args->dp, 0, -1, &bp1,
  					     XFS_ATTR_FORK);
  	if (error)
  		goto out;
  	ASSERT(bp1 != NULL);
  	bp2 = NULL;
  	error = xfs_da_get_buf(args->trans, args->dp, blkno, -1, &bp2,
  					    XFS_ATTR_FORK);
  	if (error)
  		goto out;
  	ASSERT(bp2 != NULL);
  	memcpy(bp2->data, bp1->data, XFS_LBSIZE(dp->i_mount));
  	xfs_da_buf_done(bp1);
  	bp1 = NULL;
  	xfs_da_log_buf(args->trans, bp2, 0, XFS_LBSIZE(dp->i_mount) - 1);
  
  	/*
  	 * Set up the new root node.
  	 */
  	error = xfs_da_node_create(args, 0, 1, &bp1, XFS_ATTR_FORK);
  	if (error)
  		goto out;
  	node = bp1->data;
  	leaf = bp2->data;

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

  	/* both on-disk, don't endian-flip twice */
  	node->btree[0].hashval =

  		leaf->entries[be16_to_cpu(leaf->hdr.count)-1 ].hashval;

  	node->btree[0].before = cpu_to_be32(blkno);

  	node->hdr.count = cpu_to_be16(1);

  	xfs_da_log_buf(args->trans, bp1, 0, XFS_LBSIZE(dp->i_mount) - 1);
  	error = 0;
  out:
  	if (bp1)
  		xfs_da_buf_done(bp1);
  	if (bp2)
  		xfs_da_buf_done(bp2);
  	return(error);
  }
  
  
  /*========================================================================
   * Routines used for growing the Btree.
   *========================================================================*/
  
  /*
   * Create the initial contents of a leaf attribute list
   * or a leaf in a node attribute list.
   */

  STATIC int

  xfs_attr_leaf_create(xfs_da_args_t *args, xfs_dablk_t blkno, xfs_dabuf_t **bpp)
  {
  	xfs_attr_leafblock_t *leaf;
  	xfs_attr_leaf_hdr_t *hdr;
  	xfs_inode_t *dp;
  	xfs_dabuf_t *bp;
  	int error;
  
  	dp = args->dp;
  	ASSERT(dp != NULL);
  	error = xfs_da_get_buf(args->trans, args->dp, blkno, -1, &bp,
  					    XFS_ATTR_FORK);
  	if (error)
  		return(error);
  	ASSERT(bp != NULL);
  	leaf = bp->data;
  	memset((char *)leaf, 0, XFS_LBSIZE(dp->i_mount));
  	hdr = &leaf->hdr;

  	hdr->info.magic = cpu_to_be16(XFS_ATTR_LEAF_MAGIC);

  	hdr->firstused = cpu_to_be16(XFS_LBSIZE(dp->i_mount));

  	if (!hdr->firstused) {

  		hdr->firstused = cpu_to_be16(

  			XFS_LBSIZE(dp->i_mount) - XFS_ATTR_LEAF_NAME_ALIGN);
  	}

  	hdr->freemap[0].base = cpu_to_be16(sizeof(xfs_attr_leaf_hdr_t));
  	hdr->freemap[0].size = cpu_to_be16(be16_to_cpu(hdr->firstused) -
  					   sizeof(xfs_attr_leaf_hdr_t));

  
  	xfs_da_log_buf(args->trans, bp, 0, XFS_LBSIZE(dp->i_mount) - 1);
  
  	*bpp = bp;
  	return(0);
  }
  
  /*
   * Split the leaf node, rebalance, then add the new entry.
   */
  int
  xfs_attr_leaf_split(xfs_da_state_t *state, xfs_da_state_blk_t *oldblk,
  				   xfs_da_state_blk_t *newblk)
  {
  	xfs_dablk_t blkno;
  	int error;
  
  	/*
  	 * Allocate space for a new leaf node.
  	 */
  	ASSERT(oldblk->magic == XFS_ATTR_LEAF_MAGIC);
  	error = xfs_da_grow_inode(state->args, &blkno);
  	if (error)
  		return(error);
  	error = xfs_attr_leaf_create(state->args, blkno, &newblk->bp);
  	if (error)
  		return(error);
  	newblk->blkno = blkno;
  	newblk->magic = XFS_ATTR_LEAF_MAGIC;
  
  	/*
  	 * Rebalance the entries across the two leaves.
  	 * NOTE: rebalance() currently depends on the 2nd block being empty.
  	 */
  	xfs_attr_leaf_rebalance(state, oldblk, newblk);
  	error = xfs_da_blk_link(state, oldblk, newblk);
  	if (error)
  		return(error);
  
  	/*
  	 * Save info on "old" attribute for "atomic rename" ops, leaf_add()
  	 * modifies the index/blkno/rmtblk/rmtblkcnt fields to show the
  	 * "new" attrs info.  Will need the "old" info to remove it later.
  	 *
  	 * Insert the "new" entry in the correct block.
  	 */
  	if (state->inleaf)
  		error = xfs_attr_leaf_add(oldblk->bp, state->args);
  	else
  		error = xfs_attr_leaf_add(newblk->bp, state->args);
  
  	/*
  	 * Update last hashval in each block since we added the name.
  	 */
  	oldblk->hashval = xfs_attr_leaf_lasthash(oldblk->bp, NULL);
  	newblk->hashval = xfs_attr_leaf_lasthash(newblk->bp, NULL);
  	return(error);
  }
  
  /*
   * Add a name to the leaf attribute list structure.
   */
  int
  xfs_attr_leaf_add(xfs_dabuf_t *bp, xfs_da_args_t *args)
  {
  	xfs_attr_leafblock_t *leaf;
  	xfs_attr_leaf_hdr_t *hdr;
  	xfs_attr_leaf_map_t *map;
  	int tablesize, entsize, sum, tmp, i;
  
  	leaf = bp->data;

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

  	ASSERT((args->index >= 0)

  		&& (args->index <= be16_to_cpu(leaf->hdr.count)));

  	hdr = &leaf->hdr;

  	entsize = xfs_attr_leaf_newentsize(args->namelen, args->valuelen,

  			   args->trans->t_mountp->m_sb.sb_blocksize, NULL);
  
  	/*
  	 * Search through freemap for first-fit on new name length.
  	 * (may need to figure in size of entry struct too)
  	 */

  	tablesize = (be16_to_cpu(hdr->count) + 1)

  					* sizeof(xfs_attr_leaf_entry_t)
  					+ sizeof(xfs_attr_leaf_hdr_t);
  	map = &hdr->freemap[XFS_ATTR_LEAF_MAPSIZE-1];
  	for (sum = 0, i = XFS_ATTR_LEAF_MAPSIZE-1; i >= 0; map--, i--) {

  		if (tablesize > be16_to_cpu(hdr->firstused)) {
  			sum += be16_to_cpu(map->size);

  			continue;
  		}
  		if (!map->size)
  			continue;	/* no space in this map */
  		tmp = entsize;

  		if (be16_to_cpu(map->base) < be16_to_cpu(hdr->firstused))

  			tmp += sizeof(xfs_attr_leaf_entry_t);

  		if (be16_to_cpu(map->size) >= tmp) {

  			tmp = xfs_attr_leaf_add_work(bp, args, i);
  			return(tmp);
  		}

  		sum += be16_to_cpu(map->size);

  	}
  
  	/*
  	 * If there are no holes in the address space of the block,
  	 * and we don't have enough freespace, then compaction will do us
  	 * no good and we should just give up.
  	 */
  	if (!hdr->holes && (sum < entsize))
  		return(XFS_ERROR(ENOSPC));
  
  	/*
  	 * Compact the entries to coalesce free space.
  	 * This may change the hdr->count via dropping INCOMPLETE entries.
  	 */
  	xfs_attr_leaf_compact(args->trans, bp);
  
  	/*
  	 * After compaction, the block is guaranteed to have only one
  	 * free region, in freemap[0].  If it is not big enough, give up.
  	 */

  	if (be16_to_cpu(hdr->freemap[0].size)

  				< (entsize + sizeof(xfs_attr_leaf_entry_t)))
  		return(XFS_ERROR(ENOSPC));
  
  	return(xfs_attr_leaf_add_work(bp, args, 0));
  }
  
  /*
   * Add a name to a leaf attribute list structure.
   */
  STATIC int
  xfs_attr_leaf_add_work(xfs_dabuf_t *bp, xfs_da_args_t *args, int mapindex)
  {
  	xfs_attr_leafblock_t *leaf;
  	xfs_attr_leaf_hdr_t *hdr;
  	xfs_attr_leaf_entry_t *entry;
  	xfs_attr_leaf_name_local_t *name_loc;
  	xfs_attr_leaf_name_remote_t *name_rmt;
  	xfs_attr_leaf_map_t *map;
  	xfs_mount_t *mp;
  	int tmp, i;
  
  	leaf = bp->data;

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

  	hdr = &leaf->hdr;
  	ASSERT((mapindex >= 0) && (mapindex < XFS_ATTR_LEAF_MAPSIZE));

  	ASSERT((args->index >= 0) && (args->index <= be16_to_cpu(hdr->count)));

  
  	/*
  	 * Force open some space in the entry array and fill it in.
  	 */
  	entry = &leaf->entries[args->index];

  	if (args->index < be16_to_cpu(hdr->count)) {
  		tmp  = be16_to_cpu(hdr->count) - args->index;

  		tmp *= sizeof(xfs_attr_leaf_entry_t);
  		memmove((char *)(entry+1), (char *)entry, tmp);
  		xfs_da_log_buf(args->trans, bp,
  		    XFS_DA_LOGRANGE(leaf, entry, tmp + sizeof(*entry)));
  	}

  	be16_add(&hdr->count, 1);

  
  	/*
  	 * Allocate space for the new string (at the end of the run).
  	 */
  	map = &hdr->freemap[mapindex];
  	mp = args->trans->t_mountp;

  	ASSERT(be16_to_cpu(map->base) < XFS_LBSIZE(mp));
  	ASSERT((be16_to_cpu(map->base) & 0x3) == 0);
  	ASSERT(be16_to_cpu(map->size) >=

  		xfs_attr_leaf_newentsize(args->namelen, args->valuelen,
  					 mp->m_sb.sb_blocksize, NULL));

  	ASSERT(be16_to_cpu(map->size) < XFS_LBSIZE(mp));
  	ASSERT((be16_to_cpu(map->size) & 0x3) == 0);
  	be16_add(&map->size,

  		-xfs_attr_leaf_newentsize(args->namelen, args->valuelen,
  					  mp->m_sb.sb_blocksize, &tmp));

  	entry->nameidx = cpu_to_be16(be16_to_cpu(map->base) +
  				     be16_to_cpu(map->size));
  	entry->hashval = cpu_to_be32(args->hashval);

  	entry->flags = tmp ? XFS_ATTR_LOCAL : 0;

  	entry->flags |= XFS_ATTR_NSP_ARGS_TO_ONDISK(args->flags);

  	if (args->rename) {
  		entry->flags |= XFS_ATTR_INCOMPLETE;
  		if ((args->blkno2 == args->blkno) &&
  		    (args->index2 <= args->index)) {
  			args->index2++;
  		}
  	}
  	xfs_da_log_buf(args->trans, bp,
  			  XFS_DA_LOGRANGE(leaf, entry, sizeof(*entry)));

  	ASSERT((args->index == 0) ||
  	       (be32_to_cpu(entry->hashval) >= be32_to_cpu((entry-1)->hashval)));

  	ASSERT((args->index == be16_to_cpu(hdr->count)-1) ||

  	       (be32_to_cpu(entry->hashval) <= be32_to_cpu((entry+1)->hashval)));

  
  	/*
  	 * Copy the attribute name and value into the new space.
  	 *
  	 * For "remote" attribute values, simply note that we need to
  	 * allocate space for the "remote" value.  We can't actually
  	 * allocate the extents in this transaction, and we can't decide
  	 * which blocks they should be as we might allocate more blocks
  	 * as part of this transaction (a split operation for example).
  	 */
  	if (entry->flags & XFS_ATTR_LOCAL) {
  		name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, args->index);
  		name_loc->namelen = args->namelen;

  		name_loc->valuelen = cpu_to_be16(args->valuelen);

  		memcpy((char *)name_loc->nameval, args->name, args->namelen);
  		memcpy((char *)&name_loc->nameval[args->namelen], args->value,

  				   be16_to_cpu(name_loc->valuelen));

  	} else {
  		name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, args->index);
  		name_rmt->namelen = args->namelen;
  		memcpy((char *)name_rmt->name, args->name, args->namelen);
  		entry->flags |= XFS_ATTR_INCOMPLETE;
  		/* just in case */
  		name_rmt->valuelen = 0;
  		name_rmt->valueblk = 0;
  		args->rmtblkno = 1;
  		args->rmtblkcnt = XFS_B_TO_FSB(mp, args->valuelen);
  	}
  	xfs_da_log_buf(args->trans, bp,
  	     XFS_DA_LOGRANGE(leaf, XFS_ATTR_LEAF_NAME(leaf, args->index),
  				   xfs_attr_leaf_entsize(leaf, args->index)));
  
  	/*
  	 * Update the control info for this leaf node
  	 */

  	if (be16_to_cpu(entry->nameidx) < be16_to_cpu(hdr->firstused)) {

  		/* both on-disk, don't endian-flip twice */
  		hdr->firstused = entry->nameidx;
  	}

  	ASSERT(be16_to_cpu(hdr->firstused) >=
  	       ((be16_to_cpu(hdr->count) * sizeof(*entry)) + sizeof(*hdr)));
  	tmp = (be16_to_cpu(hdr->count)-1) * sizeof(xfs_attr_leaf_entry_t)

  					+ sizeof(xfs_attr_leaf_hdr_t);
  	map = &hdr->freemap[0];
  	for (i = 0; i < XFS_ATTR_LEAF_MAPSIZE; map++, i++) {

  		if (be16_to_cpu(map->base) == tmp) {
  			be16_add(&map->base, sizeof(xfs_attr_leaf_entry_t));
  			be16_add(&map->size,
  				 -((int)sizeof(xfs_attr_leaf_entry_t)));

  		}
  	}

  	be16_add(&hdr->usedbytes, xfs_attr_leaf_entsize(leaf, args->index));

  	xfs_da_log_buf(args->trans, bp,
  		XFS_DA_LOGRANGE(leaf, hdr, sizeof(*hdr)));
  	return(0);
  }
  
  /*
   * Garbage collect a leaf attribute list block by copying it to a new buffer.
   */
  STATIC void
  xfs_attr_leaf_compact(xfs_trans_t *trans, xfs_dabuf_t *bp)
  {
  	xfs_attr_leafblock_t *leaf_s, *leaf_d;
  	xfs_attr_leaf_hdr_t *hdr_s, *hdr_d;
  	xfs_mount_t *mp;
  	char *tmpbuffer;
  
  	mp = trans->t_mountp;
  	tmpbuffer = kmem_alloc(XFS_LBSIZE(mp), KM_SLEEP);
  	ASSERT(tmpbuffer != NULL);
  	memcpy(tmpbuffer, bp->data, XFS_LBSIZE(mp));
  	memset(bp->data, 0, XFS_LBSIZE(mp));
  
  	/*
  	 * Copy basic information
  	 */
  	leaf_s = (xfs_attr_leafblock_t *)tmpbuffer;
  	leaf_d = bp->data;
  	hdr_s = &leaf_s->hdr;
  	hdr_d = &leaf_d->hdr;
  	hdr_d->info = hdr_s->info;	/* struct copy */

  	hdr_d->firstused = cpu_to_be16(XFS_LBSIZE(mp));

  	/* handle truncation gracefully */
  	if (!hdr_d->firstused) {

  		hdr_d->firstused = cpu_to_be16(

  				XFS_LBSIZE(mp) - XFS_ATTR_LEAF_NAME_ALIGN);
  	}
  	hdr_d->usedbytes = 0;
  	hdr_d->count = 0;
  	hdr_d->holes = 0;

  	hdr_d->freemap[0].base = cpu_to_be16(sizeof(xfs_attr_leaf_hdr_t));
  	hdr_d->freemap[0].size = cpu_to_be16(be16_to_cpu(hdr_d->firstused) -
  					     sizeof(xfs_attr_leaf_hdr_t));

  
  	/*
  	 * Copy all entry's in the same (sorted) order,
  	 * but allocate name/value pairs packed and in sequence.
  	 */
  	xfs_attr_leaf_moveents(leaf_s, 0, leaf_d, 0,

  				be16_to_cpu(hdr_s->count), mp);

  	xfs_da_log_buf(trans, bp, 0, XFS_LBSIZE(mp) - 1);
  
  	kmem_free(tmpbuffer, XFS_LBSIZE(mp));
  }
  
  /*
   * Redistribute the attribute list entries between two leaf nodes,
   * taking into account the size of the new entry.
   *
   * NOTE: if new block is empty, then it will get the upper half of the
   * old block.  At present, all (one) callers pass in an empty second block.
   *
   * This code adjusts the args->index/blkno and args->index2/blkno2 fields
   * to match what it is doing in splitting the attribute leaf block.  Those
   * values are used in "atomic rename" operations on attributes.  Note that
   * the "new" and "old" values can end up in different blocks.
   */
  STATIC void
  xfs_attr_leaf_rebalance(xfs_da_state_t *state, xfs_da_state_blk_t *blk1,
  				       xfs_da_state_blk_t *blk2)
  {
  	xfs_da_args_t *args;
  	xfs_da_state_blk_t *tmp_blk;
  	xfs_attr_leafblock_t *leaf1, *leaf2;
  	xfs_attr_leaf_hdr_t *hdr1, *hdr2;
  	int count, totallen, max, space, swap;
  
  	/*
  	 * Set up environment.
  	 */
  	ASSERT(blk1->magic == XFS_ATTR_LEAF_MAGIC);
  	ASSERT(blk2->magic == XFS_ATTR_LEAF_MAGIC);
  	leaf1 = blk1->bp->data;
  	leaf2 = blk2->bp->data;

  	ASSERT(be16_to_cpu(leaf1->hdr.info.magic) == XFS_ATTR_LEAF_MAGIC);
  	ASSERT(be16_to_cpu(leaf2->hdr.info.magic) == XFS_ATTR_LEAF_MAGIC);

  	args = state->args;
  
  	/*
  	 * Check ordering of blocks, reverse if it makes things simpler.
  	 *
  	 * NOTE: Given that all (current) callers pass in an empty
  	 * second block, this code should never set "swap".
  	 */
  	swap = 0;
  	if (xfs_attr_leaf_order(blk1->bp, blk2->bp)) {
  		tmp_blk = blk1;
  		blk1 = blk2;
  		blk2 = tmp_blk;
  		leaf1 = blk1->bp->data;
  		leaf2 = blk2->bp->data;
  		swap = 1;
  	}
  	hdr1 = &leaf1->hdr;
  	hdr2 = &leaf2->hdr;
  
  	/*
  	 * Examine entries until we reduce the absolute difference in
  	 * byte usage between the two blocks to a minimum.  Then get
  	 * the direction to copy and the number of elements to move.
  	 *
  	 * "inleaf" is true if the new entry should be inserted into blk1.
  	 * If "swap" is also true, then reverse the sense of "inleaf".
  	 */
  	state->inleaf = xfs_attr_leaf_figure_balance(state, blk1, blk2,
  							    &count, &totallen);
  	if (swap)
  		state->inleaf = !state->inleaf;
  
  	/*
  	 * Move any entries required from leaf to leaf:
  	 */

  	if (count < be16_to_cpu(hdr1->count)) {

  		/*
  		 * Figure the total bytes to be added to the destination leaf.
  		 */
  		/* number entries being moved */

  		count = be16_to_cpu(hdr1->count) - count;
  		space  = be16_to_cpu(hdr1->usedbytes) - totallen;

  		space += count * sizeof(xfs_attr_leaf_entry_t);
  
  		/*
  		 * leaf2 is the destination, compact it if it looks tight.
  		 */

  		max  = be16_to_cpu(hdr2->firstused)

  						- sizeof(xfs_attr_leaf_hdr_t);

  		max -= be16_to_cpu(hdr2->count) * sizeof(xfs_attr_leaf_entry_t);

  		if (space > max) {
  			xfs_attr_leaf_compact(args->trans, blk2->bp);
  		}
  
  		/*
  		 * Move high entries from leaf1 to low end of leaf2.
  		 */

  		xfs_attr_leaf_moveents(leaf1, be16_to_cpu(hdr1->count) - count,

  				leaf2, 0, count, state->mp);
  
  		xfs_da_log_buf(args->trans, blk1->bp, 0, state->blocksize-1);
  		xfs_da_log_buf(args->trans, blk2->bp, 0, state->blocksize-1);

  	} else if (count > be16_to_cpu(hdr1->count)) {

  		/*
  		 * I assert that since all callers pass in an empty
  		 * second buffer, this code should never execute.
  		 */
  
  		/*
  		 * Figure the total bytes to be added to the destination leaf.
  		 */
  		/* number entries being moved */

  		count -= be16_to_cpu(hdr1->count);
  		space  = totallen - be16_to_cpu(hdr1->usedbytes);

  		space += count * sizeof(xfs_attr_leaf_entry_t);
  
  		/*
  		 * leaf1 is the destination, compact it if it looks tight.
  		 */

  		max  = be16_to_cpu(hdr1->firstused)

  						- sizeof(xfs_attr_leaf_hdr_t);

  		max -= be16_to_cpu(hdr1->count) * sizeof(xfs_attr_leaf_entry_t);

  		if (space > max) {
  			xfs_attr_leaf_compact(args->trans, blk1->bp);
  		}
  
  		/*
  		 * Move low entries from leaf2 to high end of leaf1.
  		 */
  		xfs_attr_leaf_moveents(leaf2, 0, leaf1,

  				be16_to_cpu(hdr1->count), count, state->mp);

  
  		xfs_da_log_buf(args->trans, blk1->bp, 0, state->blocksize-1);
  		xfs_da_log_buf(args->trans, blk2->bp, 0, state->blocksize-1);
  	}
  
  	/*
  	 * Copy out last hashval in each block for B-tree code.
  	 */

  	blk1->hashval = be32_to_cpu(
  		leaf1->entries[be16_to_cpu(leaf1->hdr.count)-1].hashval);
  	blk2->hashval = be32_to_cpu(
  		leaf2->entries[be16_to_cpu(leaf2->hdr.count)-1].hashval);

  
  	/*
  	 * Adjust the expected index for insertion.
  	 * NOTE: this code depends on the (current) situation that the
  	 * second block was originally empty.
  	 *
  	 * If the insertion point moved to the 2nd block, we must adjust
  	 * the index.  We must also track the entry just following the
  	 * new entry for use in an "atomic rename" operation, that entry
  	 * is always the "old" entry and the "new" entry is what we are
  	 * inserting.  The index/blkno fields refer to the "old" entry,
  	 * while the index2/blkno2 fields refer to the "new" entry.
  	 */

  	if (blk1->index > be16_to_cpu(leaf1->hdr.count)) {

  		ASSERT(state->inleaf == 0);

  		blk2->index = blk1->index - be16_to_cpu(leaf1->hdr.count);

  		args->index = args->index2 = blk2->index;
  		args->blkno = args->blkno2 = blk2->blkno;

  	} else if (blk1->index == be16_to_cpu(leaf1->hdr.count)) {

  		if (state->inleaf) {
  			args->index = blk1->index;
  			args->blkno = blk1->blkno;
  			args->index2 = 0;
  			args->blkno2 = blk2->blkno;
  		} else {
  			blk2->index = blk1->index

  				    - be16_to_cpu(leaf1->hdr.count);

  			args->index = args->index2 = blk2->index;
  			args->blkno = args->blkno2 = blk2->blkno;
  		}
  	} else {
  		ASSERT(state->inleaf == 1);
  		args->index = args->index2 = blk1->index;
  		args->blkno = args->blkno2 = blk1->blkno;
  	}
  }
  
  /*
   * Examine entries until we reduce the absolute difference in
   * byte usage between the two blocks to a minimum.
   * GROT: Is this really necessary?  With other than a 512 byte blocksize,
   * GROT: there will always be enough room in either block for a new entry.
   * GROT: Do a double-split for this case?
   */
  STATIC int
  xfs_attr_leaf_figure_balance(xfs_da_state_t *state,
  				    xfs_da_state_blk_t *blk1,
  				    xfs_da_state_blk_t *blk2,
  				    int *countarg, int *usedbytesarg)
  {
  	xfs_attr_leafblock_t *leaf1, *leaf2;
  	xfs_attr_leaf_hdr_t *hdr1, *hdr2;
  	xfs_attr_leaf_entry_t *entry;
  	int count, max, index, totallen, half;
  	int lastdelta, foundit, tmp;
  
  	/*
  	 * Set up environment.
  	 */
  	leaf1 = blk1->bp->data;
  	leaf2 = blk2->bp->data;
  	hdr1 = &leaf1->hdr;
  	hdr2 = &leaf2->hdr;
  	foundit = 0;
  	totallen = 0;
  
  	/*
  	 * Examine entries until we reduce the absolute difference in
  	 * byte usage between the two blocks to a minimum.
  	 */

  	max = be16_to_cpu(hdr1->count) + be16_to_cpu(hdr2->count);

  	half  = (max+1) * sizeof(*entry);

  	half += be16_to_cpu(hdr1->usedbytes) +
  		be16_to_cpu(hdr2->usedbytes) +
  		xfs_attr_leaf_newentsize(
  				state->args->namelen,
  				state->args->valuelen,
  				state->blocksize, NULL);

  	half /= 2;
  	lastdelta = state->blocksize;
  	entry = &leaf1->entries[0];
  	for (count = index = 0; count < max; entry++, index++, count++) {
  
  #define XFS_ATTR_ABS(A)	(((A) < 0) ? -(A) : (A))
  		/*
  		 * The new entry is in the first block, account for it.
  		 */
  		if (count == blk1->index) {
  			tmp = totallen + sizeof(*entry) +

  				xfs_attr_leaf_newentsize(
  						state->args->namelen,
  						state->args->valuelen,
  						state->blocksize, NULL);

  			if (XFS_ATTR_ABS(half - tmp) > lastdelta)
  				break;
  			lastdelta = XFS_ATTR_ABS(half - tmp);
  			totallen = tmp;
  			foundit = 1;
  		}
  
  		/*
  		 * Wrap around into the second block if necessary.
  		 */

  		if (count == be16_to_cpu(hdr1->count)) {

  			leaf1 = leaf2;
  			entry = &leaf1->entries[0];
  			index = 0;
  		}
  
  		/*
  		 * Figure out if next leaf entry would be too much.
  		 */
  		tmp = totallen + sizeof(*entry) + xfs_attr_leaf_entsize(leaf1,
  									index);
  		if (XFS_ATTR_ABS(half - tmp) > lastdelta)
  			break;
  		lastdelta = XFS_ATTR_ABS(half - tmp);
  		totallen = tmp;
  #undef XFS_ATTR_ABS
  	}
  
  	/*
  	 * Calculate the number of usedbytes that will end up in lower block.
  	 * If new entry not in lower block, fix up the count.
  	 */
  	totallen -= count * sizeof(*entry);
  	if (foundit) {
  		totallen -= sizeof(*entry) +

  				xfs_attr_leaf_newentsize(
  						state->args->namelen,
  						state->args->valuelen,
  						state->blocksize, NULL);

  	}
  
  	*countarg = count;
  	*usedbytesarg = totallen;
  	return(foundit);
  }
  
  /*========================================================================
   * Routines used for shrinking the Btree.
   *========================================================================*/
  
  /*
   * Check a leaf block and its neighbors to see if the block should be
   * collapsed into one or the other neighbor.  Always keep the block
   * with the smaller block number.
   * If the current block is over 50% full, don't try to join it, return 0.
   * If the block is empty, fill in the state structure and return 2.
   * If it can be collapsed, fill in the state structure and return 1.
   * If nothing can be done, return 0.
   *
   * GROT: allow for INCOMPLETE entries in calculation.
   */
  int
  xfs_attr_leaf_toosmall(xfs_da_state_t *state, int *action)
  {
  	xfs_attr_leafblock_t *leaf;
  	xfs_da_state_blk_t *blk;
  	xfs_da_blkinfo_t *info;
  	int count, bytes, forward, error, retval, i;
  	xfs_dablk_t blkno;
  	xfs_dabuf_t *bp;
  
  	/*
  	 * Check for the degenerate case of the block being over 50% full.
  	 * If so, it's not worth even looking to see if we might be able
  	 * to coalesce with a sibling.
  	 */
  	blk = &state->path.blk[ state->path.active-1 ];
  	info = blk->bp->data;

  	ASSERT(be16_to_cpu(info->magic) == XFS_ATTR_LEAF_MAGIC);

  	leaf = (xfs_attr_leafblock_t *)info;

  	count = be16_to_cpu(leaf->hdr.count);

  	bytes = sizeof(xfs_attr_leaf_hdr_t) +
  		count * sizeof(xfs_attr_leaf_entry_t) +

  		be16_to_cpu(leaf->hdr.usedbytes);

  	if (bytes > (state->blocksize >> 1)) {
  		*action = 0;	/* blk over 50%, don't try to join */
  		return(0);
  	}
  
  	/*
  	 * Check for the degenerate case of the block being empty.
  	 * If the block is empty, we'll simply delete it, no need to

  	 * coalesce it with a sibling block.  We choose (arbitrarily)

  	 * to merge with the forward block unless it is NULL.
  	 */
  	if (count == 0) {
  		/*
  		 * Make altpath point to the block we want to keep and
  		 * path point to the block we want to drop (this one).
  		 */

  		forward = (info->forw != 0);

  		memcpy(&state->altpath, &state->path, sizeof(state->path));
  		error = xfs_da_path_shift(state, &state->altpath, forward,
  						 0, &retval);
  		if (error)
  			return(error);
  		if (retval) {
  			*action = 0;
  		} else {
  			*action = 2;
  		}
  		return(0);
  	}
  
  	/*
  	 * Examine each sibling block to see if we can coalesce with
  	 * at least 25% free space to spare.  We need to figure out
  	 * whether to merge with the forward or the backward block.
  	 * We prefer coalescing with the lower numbered sibling so as
  	 * to shrink an attribute list over time.
  	 */
  	/* start with smaller blk num */

  	forward = (be32_to_cpu(info->forw) < be32_to_cpu(info->back));

  	for (i = 0; i < 2; forward = !forward, i++) {
  		if (forward)

  			blkno = be32_to_cpu(info->forw);

  		else

  			blkno = be32_to_cpu(info->back);

  		if (blkno == 0)
  			continue;
  		error = xfs_da_read_buf(state->args->trans, state->args->dp,
  					blkno, -1, &bp, XFS_ATTR_FORK);
  		if (error)
  			return(error);
  		ASSERT(bp != NULL);
  
  		leaf = (xfs_attr_leafblock_t *)info;

  		count  = be16_to_cpu(leaf->hdr.count);

  		bytes  = state->blocksize - (state->blocksize>>2);

  		bytes -= be16_to_cpu(leaf->hdr.usedbytes);

  		leaf = bp->data;

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

  		count += be16_to_cpu(leaf->hdr.count);
  		bytes -= be16_to_cpu(leaf->hdr.usedbytes);

  		bytes -= count * sizeof(xfs_attr_leaf_entry_t);
  		bytes -= sizeof(xfs_attr_leaf_hdr_t);
  		xfs_da_brelse(state->args->trans, bp);
  		if (bytes >= 0)
  			break;	/* fits with at least 25% to spare */
  	}
  	if (i >= 2) {
  		*action = 0;
  		return(0);
  	}
  
  	/*
  	 * Make altpath point to the block we want to keep (the lower
  	 * numbered block) and path point to the block we want to drop.
  	 */
  	memcpy(&state->altpath, &state->path, sizeof(state->path));
  	if (blkno < blk->blkno) {
  		error = xfs_da_path_shift(state, &state->altpath, forward,
  						 0, &retval);
  	} else {
  		error = xfs_da_path_shift(state, &state->path, forward,
  						 0, &retval);
  	}
  	if (error)
  		return(error);
  	if (retval) {
  		*action = 0;
  	} else {
  		*action = 1;
  	}
  	return(0);
  }
  
  /*
   * Remove a name from the leaf attribute list structure.
   *
   * Return 1 if leaf is less than 37% full, 0 if >= 37% full.
   * If two leaves are 37% full, when combined they will leave 25% free.
   */
  int
  xfs_attr_leaf_remove(xfs_dabuf_t *bp, xfs_da_args_t *args)
  {
  	xfs_attr_leafblock_t *leaf;
  	xfs_attr_leaf_hdr_t *hdr;
  	xfs_attr_leaf_map_t *map;
  	xfs_attr_leaf_entry_t *entry;
  	int before, after, smallest, entsize;
  	int tablesize, tmp, i;
  	xfs_mount_t *mp;
  
  	leaf = bp->data;

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

  	hdr = &leaf->hdr;
  	mp = args->trans->t_mountp;

  	ASSERT((be16_to_cpu(hdr->count) > 0)
  		&& (be16_to_cpu(hdr->count) < (XFS_LBSIZE(mp)/8)));

  	ASSERT((args->index >= 0)

  		&& (args->index < be16_to_cpu(hdr->count)));
  	ASSERT(be16_to_cpu(hdr->firstused) >=
  	       ((be16_to_cpu(hdr->count) * sizeof(*entry)) + sizeof(*hdr)));

  	entry = &leaf->entries[args->index];

  	ASSERT(be16_to_cpu(entry->nameidx) >= be16_to_cpu(hdr->firstused));
  	ASSERT(be16_to_cpu(entry->nameidx) < XFS_LBSIZE(mp));

  
  	/*
  	 * Scan through free region table:
  	 *    check for adjacency of free'd entry with an existing one,
  	 *    find smallest free region in case we need to replace it,
  	 *    adjust any map that borders the entry table,
  	 */

  	tablesize = be16_to_cpu(hdr->count) * sizeof(xfs_attr_leaf_entry_t)

  					+ sizeof(xfs_attr_leaf_hdr_t);
  	map = &hdr->freemap[0];

  	tmp = be16_to_cpu(map->size);

  	before = after = -1;
  	smallest = XFS_ATTR_LEAF_MAPSIZE - 1;
  	entsize = xfs_attr_leaf_entsize(leaf, args->index);
  	for (i = 0; i < XFS_ATTR_LEAF_MAPSIZE; map++, i++) {

  		ASSERT(be16_to_cpu(map->base) < XFS_LBSIZE(mp));
  		ASSERT(be16_to_cpu(map->size) < XFS_LBSIZE(mp));
  		if (be16_to_cpu(map->base) == tablesize) {
  			be16_add(&map->base,
  				 -((int)sizeof(xfs_attr_leaf_entry_t)));
  			be16_add(&map->size, sizeof(xfs_attr_leaf_entry_t));

  		}

  		if ((be16_to_cpu(map->base) + be16_to_cpu(map->size))

  				== be16_to_cpu(entry->nameidx)) {

  			before = i;

  		} else if (be16_to_cpu(map->base)

  			== (be16_to_cpu(entry->nameidx) + entsize)) {

  			after = i;

  		} else if (be16_to_cpu(map->size) < tmp) {
  			tmp = be16_to_cpu(map->size);

  			smallest = i;
  		}
  	}
  
  	/*
  	 * Coalesce adjacent freemap regions,
  	 * or replace the smallest region.
  	 */
  	if ((before >= 0) || (after >= 0)) {
  		if ((before >= 0) && (after >= 0)) {
  			map = &hdr->freemap[before];

  			be16_add(&map->size, entsize);
  			be16_add(&map->size,
  				 be16_to_cpu(hdr->freemap[after].size));

  			hdr->freemap[after].base = 0;
  			hdr->freemap[after].size = 0;
  		} else if (before >= 0) {
  			map = &hdr->freemap[before];

  			be16_add(&map->size, entsize);

  		} else {
  			map = &hdr->freemap[after];
  			/* both on-disk, don't endian flip twice */
  			map->base = entry->nameidx;

  			be16_add(&map->size, entsize);

  		}
  	} else {
  		/*
  		 * Replace smallest region (if it is smaller than free'd entry)
  		 */
  		map = &hdr->freemap[smallest];

  		if (be16_to_cpu(map->size) < entsize) {

  			map->base = cpu_to_be16(be16_to_cpu(entry->nameidx));

  			map->size = cpu_to_be16(entsize);

  		}
  	}
  
  	/*
  	 * Did we remove the first entry?
  	 */

  	if (be16_to_cpu(entry->nameidx) == be16_to_cpu(hdr->firstused))

  		smallest = 1;
  	else
  		smallest = 0;
  
  	/*
  	 * Compress the remaining entries and zero out the removed stuff.
  	 */
  	memset(XFS_ATTR_LEAF_NAME(leaf, args->index), 0, entsize);

  	be16_add(&hdr->usedbytes, -entsize);

  	xfs_da_log_buf(args->trans, bp,
  	     XFS_DA_LOGRANGE(leaf, XFS_ATTR_LEAF_NAME(leaf, args->index),
  				   entsize));

  	tmp = (be16_to_cpu(hdr->count) - args->index)

  					* sizeof(xfs_attr_leaf_entry_t);
  	memmove((char *)entry, (char *)(entry+1), tmp);

  	be16_add(&hdr->count, -1);

  	xfs_da_log_buf(args->trans, bp,
  	    XFS_DA_LOGRANGE(leaf, entry, tmp + sizeof(*entry)));

  	entry = &leaf->entries[be16_to_cpu(hdr->count)];

  	memset((char *)entry, 0, sizeof(xfs_attr_leaf_entry_t));
  
  	/*
  	 * If we removed the first entry, re-find the first used byte
  	 * in the name area.  Note that if the entry was the "firstused",
  	 * then we don't have a "hole" in our block resulting from
  	 * removing the name.
  	 */
  	if (smallest) {
  		tmp = XFS_LBSIZE(mp);
  		entry = &leaf->entries[0];

  		for (i = be16_to_cpu(hdr->count)-1; i >= 0; entry++, i--) {

  			ASSERT(be16_to_cpu(entry->nameidx) >=
  			       be16_to_cpu(hdr->firstused));
  			ASSERT(be16_to_cpu(entry->nameidx) < XFS_LBSIZE(mp));
  
  			if (be16_to_cpu(entry->nameidx) < tmp)
  				tmp = be16_to_cpu(entry->nameidx);

  		}

  		hdr->firstused = cpu_to_be16(tmp);

  		if (!hdr->firstused) {

  			hdr->firstused = cpu_to_be16(

  					tmp - XFS_ATTR_LEAF_NAME_ALIGN);
  		}
  	} else {
  		hdr->holes = 1;		/* mark as needing compaction */
  	}
  	xfs_da_log_buf(args->trans, bp,
  			  XFS_DA_LOGRANGE(leaf, hdr, sizeof(*hdr)));
  
  	/*
  	 * Check if leaf is less than 50% full, caller may want to
  	 * "join" the leaf with a sibling if so.
  	 */
  	tmp  = sizeof(xfs_attr_leaf_hdr_t);

  	tmp += be16_to_cpu(leaf->hdr.count) * sizeof(xfs_attr_leaf_entry_t);
  	tmp += be16_to_cpu(leaf->hdr.usedbytes);

  	return(tmp < mp->m_attr_magicpct); /* leaf is < 37% full */
  }
  
  /*
   * Move all the attribute list entries from drop_leaf into save_leaf.
   */
  void
  xfs_attr_leaf_unbalance(xfs_da_state_t *state, xfs_da_state_blk_t *drop_blk,
  				       xfs_da_state_blk_t *save_blk)
  {
  	xfs_attr_leafblock_t *drop_leaf, *save_leaf, *tmp_leaf;
  	xfs_attr_leaf_hdr_t *drop_hdr, *save_hdr, *tmp_hdr;
  	xfs_mount_t *mp;
  	char *tmpbuffer;
  
  	/*
  	 * Set up environment.
  	 */
  	mp = state->mp;
  	ASSERT(drop_blk->magic == XFS_ATTR_LEAF_MAGIC);
  	ASSERT(save_blk->magic == XFS_ATTR_LEAF_MAGIC);
  	drop_leaf = drop_blk->bp->data;
  	save_leaf = save_blk->bp->data;

  	ASSERT(be16_to_cpu(drop_leaf->hdr.info.magic) == XFS_ATTR_LEAF_MAGIC);
  	ASSERT(be16_to_cpu(save_leaf->hdr.info.magic) == XFS_ATTR_LEAF_MAGIC);

  	drop_hdr = &drop_leaf->hdr;
  	save_hdr = &save_leaf->hdr;
  
  	/*
  	 * Save last hashval from dying block for later Btree fixup.
  	 */

  	drop_blk->hashval = be32_to_cpu(
  		drop_leaf->entries[be16_to_cpu(drop_leaf->hdr.count)-1].hashval);

  
  	/*
  	 * Check if we need a temp buffer, or can we do it in place.
  	 * Note that we don't check "leaf" for holes because we will
  	 * always be dropping it, toosmall() decided that for us already.
  	 */
  	if (save_hdr->holes == 0) {
  		/*
  		 * dest leaf has no holes, so we add there.  May need
  		 * to make some room in the entry array.
  		 */
  		if (xfs_attr_leaf_order(save_blk->bp, drop_blk->bp)) {
  			xfs_attr_leaf_moveents(drop_leaf, 0, save_leaf, 0,

  			     be16_to_cpu(drop_hdr->count), mp);

  		} else {
  			xfs_attr_leaf_moveents(drop_leaf, 0, save_leaf,

  				  be16_to_cpu(save_hdr->count),
  				  be16_to_cpu(drop_hdr->count), mp);

  		}
  	} else {
  		/*
  		 * Destination has holes, so we make a temporary copy
  		 * of the leaf and add them both to that.
  		 */
  		tmpbuffer = kmem_alloc(state->blocksize, KM_SLEEP);
  		ASSERT(tmpbuffer != NULL);
  		memset(tmpbuffer, 0, state->blocksize);
  		tmp_leaf = (xfs_attr_leafblock_t *)tmpbuffer;
  		tmp_hdr = &tmp_leaf->hdr;
  		tmp_hdr->info = save_hdr->info;	/* struct copy */
  		tmp_hdr->count = 0;

  		tmp_hdr->firstused = cpu_to_be16(state->blocksize);

  		if (!tmp_hdr->firstused) {

  			tmp_hdr->firstused = cpu_to_be16(

  				state->blocksize - XFS_ATTR_LEAF_NAME_ALIGN);
  		}
  		tmp_hdr->usedbytes = 0;
  		if (xfs_attr_leaf_order(save_blk->bp, drop_blk->bp)) {
  			xfs_attr_leaf_moveents(drop_leaf, 0, tmp_leaf, 0,

  				be16_to_cpu(drop_hdr->count), mp);

  			xfs_attr_leaf_moveents(save_leaf, 0, tmp_leaf,

  				  be16_to_cpu(tmp_leaf->hdr.count),
  				  be16_to_cpu(save_hdr->count), mp);

  		} else {
  			xfs_attr_leaf_moveents(save_leaf, 0, tmp_leaf, 0,

  				be16_to_cpu(save_hdr->count), mp);

  			xfs_attr_leaf_moveents(drop_leaf, 0, tmp_leaf,

  				be16_to_cpu(tmp_leaf->hdr.count),
  				be16_to_cpu(drop_hdr->count), mp);

  		}
  		memcpy((char *)save_leaf, (char *)tmp_leaf, state->blocksize);
  		kmem_free(tmpbuffer, state->blocksize);
  	}
  
  	xfs_da_log_buf(state->args->trans, save_blk->bp, 0,
  					   state->blocksize - 1);
  
  	/*
  	 * Copy out last hashval in each block for B-tree code.
  	 */

  	save_blk->hashval = be32_to_cpu(
  		save_leaf->entries[be16_to_cpu(save_leaf->hdr.count)-1].hashval);

  }
  
  /*========================================================================
   * Routines used for finding things in the Btree.
   *========================================================================*/
  
  /*
   * Look up a name in a leaf attribute list structure.
   * This is the internal routine, it uses the caller's buffer.
   *
   * Note that duplicate keys are allowed, but only check within the
   * current leaf node.  The Btree code must check in adjacent leaf nodes.
   *
   * Return in args->index the index into the entry[] array of either
   * the found entry, or where the entry should have been (insert before
   * that entry).
   *
   * Don't change the args->value unless we find the attribute.
   */
  int
  xfs_attr_leaf_lookup_int(xfs_dabuf_t *bp, xfs_da_args_t *args)
  {
  	xfs_attr_leafblock_t *leaf;
  	xfs_attr_leaf_entry_t *entry;
  	xfs_attr_leaf_name_local_t *name_loc;
  	xfs_attr_leaf_name_remote_t *name_rmt;
  	int probe, span;
  	xfs_dahash_t hashval;
  
  	leaf = bp->data;

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

  	ASSERT(be16_to_cpu(leaf->hdr.count)

  					< (XFS_LBSIZE(args->dp->i_mount)/8));
  
  	/*
  	 * Binary search.  (note: small blocks will skip this loop)
  	 */
  	hashval = args->hashval;

  	probe = span = be16_to_cpu(leaf->hdr.count) / 2;

  	for (entry = &leaf->entries[probe]; span > 4;
  		   entry = &leaf->entries[probe]) {
  		span /= 2;

  		if (be32_to_cpu(entry->hashval) < hashval)

  			probe += span;

  		else if (be32_to_cpu(entry->hashval) > hashval)

  			probe -= span;
  		else
  			break;
  	}

  	ASSERT((probe >= 0) &&

  	       (!leaf->hdr.count

  	       || (probe < be16_to_cpu(leaf->hdr.count))));

  	ASSERT((span <= 4) || (be32_to_cpu(entry->hashval) == hashval));

  
  	/*
  	 * Since we may have duplicate hashval's, find the first matching
  	 * hashval in the leaf.
  	 */

  	while ((probe > 0) && (be32_to_cpu(entry->hashval) >= hashval)) {

  		entry--;
  		probe--;
  	}

  	while ((probe < be16_to_cpu(leaf->hdr.count)) &&
  	       (be32_to_cpu(entry->hashval) < hashval)) {

  		entry++;
  		probe++;
  	}

  	if ((probe == be16_to_cpu(leaf->hdr.count)) ||
  	    (be32_to_cpu(entry->hashval) != hashval)) {

  		args->index = probe;
  		return(XFS_ERROR(ENOATTR));
  	}
  
  	/*
  	 * Duplicate keys may be present, so search all of them for a match.
  	 */

  	for (  ; (probe < be16_to_cpu(leaf->hdr.count)) &&
  			(be32_to_cpu(entry->hashval) == hashval);

  			entry++, probe++) {
  /*
   * GROT: Add code to remove incomplete entries.
   */
  		/*
  		 * If we are looking for INCOMPLETE entries, show only those.
  		 * If we are looking for complete entries, show only those.
  		 */
  		if ((args->flags & XFS_ATTR_INCOMPLETE) !=
  		    (entry->flags & XFS_ATTR_INCOMPLETE)) {
  			continue;
  		}
  		if (entry->flags & XFS_ATTR_LOCAL) {
  			name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, probe);
  			if (name_loc->namelen != args->namelen)
  				continue;

  			if (memcmp(args->name, (char *)name_loc->nameval, args->namelen) != 0)

  				continue;

  			if (!xfs_attr_namesp_match(args->flags, entry->flags))

  				continue;
  			args->index = probe;
  			return(XFS_ERROR(EEXIST));
  		} else {
  			name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, probe);
  			if (name_rmt->namelen != args->namelen)
  				continue;
  			if (memcmp(args->name, (char *)name_rmt->name,
  					     args->namelen) != 0)
  				continue;

  			if (!xfs_attr_namesp_match(args->flags, entry->flags))

  				continue;
  			args->index = probe;

  			args->rmtblkno = be32_to_cpu(name_rmt->valueblk);

  			args->rmtblkcnt = XFS_B_TO_FSB(args->dp->i_mount,

  						   be32_to_cpu(name_rmt->valuelen));

  			return(XFS_ERROR(EEXIST));
  		}
  	}
  	args->index = probe;
  	return(XFS_ERROR(ENOATTR));
  }
  
  /*
   * Get the value associated with an attribute name from a leaf attribute
   * list structure.
   */
  int
  xfs_attr_leaf_getvalue(xfs_dabuf_t *bp, xfs_da_args_t *args)
  {
  	int valuelen;
  	xfs_attr_leafblock_t *leaf;
  	xfs_attr_leaf_entry_t *entry;
  	xfs_attr_leaf_name_local_t *name_loc;
  	xfs_attr_leaf_name_remote_t *name_rmt;
  
  	leaf = bp->data;

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

  	ASSERT(be16_to_cpu(leaf->hdr.count)

  					< (XFS_LBSIZE(args->dp->i_mount)/8));

  	ASSERT(args->index < be16_to_cpu(leaf->hdr.count));

  
  	entry = &leaf->entries[args->index];
  	if (entry->flags & XFS_ATTR_LOCAL) {
  		name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, args->index);
  		ASSERT(name_loc->namelen == args->namelen);
  		ASSERT(memcmp(args->name, name_loc->nameval, args->namelen) == 0);

  		valuelen = be16_to_cpu(name_loc->valuelen);

  		if (args->flags & ATTR_KERNOVAL) {
  			args->valuelen = valuelen;
  			return(0);
  		}
  		if (args->valuelen < valuelen) {
  			args->valuelen = valuelen;
  			return(XFS_ERROR(ERANGE));
  		}
  		args->valuelen = valuelen;
  		memcpy(args->value, &name_loc->nameval[args->namelen], valuelen);
  	} else {
  		name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, args->index);
  		ASSERT(name_rmt->namelen == args->namelen);
  		ASSERT(memcmp(args->name, name_rmt->name, args->namelen) == 0);

  		valuelen = be32_to_cpu(name_rmt->valuelen);
  		args->rmtblkno = be32_to_cpu(name_rmt->valueblk);

  		args->rmtblkcnt = XFS_B_TO_FSB(args->dp->i_mount, valuelen);
  		if (args->flags & ATTR_KERNOVAL) {
  			args->valuelen = valuelen;
  			return(0);
  		}
  		if (args->valuelen < valuelen) {
  			args->valuelen = valuelen;
  			return(XFS_ERROR(ERANGE));
  		}
  		args->valuelen = valuelen;
  	}
  	return(0);
  }
  
  /*========================================================================
   * Utility routines.
   *========================================================================*/
  
  /*
   * Move the indicated entries from one leaf to another.
   * NOTE: this routine modifies both source and destination leaves.
   */
  /*ARGSUSED*/
  STATIC void
  xfs_attr_leaf_moveents(xfs_attr_leafblock_t *leaf_s, int start_s,
  			xfs_attr_leafblock_t *leaf_d, int start_d,
  			int count, xfs_mount_t *mp)
  {
  	xfs_attr_leaf_hdr_t *hdr_s, *hdr_d;
  	xfs_attr_leaf_entry_t *entry_s, *entry_d;
  	int desti, tmp, i;
  
  	/*
  	 * Check for nothing to do.
  	 */
  	if (count == 0)
  		return;
  
  	/*
  	 * Set up environment.
  	 */

  	ASSERT(be16_to_cpu(leaf_s->hdr.info.magic) == XFS_ATTR_LEAF_MAGIC);
  	ASSERT(be16_to_cpu(leaf_d->hdr.info.magic) == XFS_ATTR_LEAF_MAGIC);

  	hdr_s = &leaf_s->hdr;
  	hdr_d = &leaf_d->hdr;

  	ASSERT((be16_to_cpu(hdr_s->count) > 0) &&
  	       (be16_to_cpu(hdr_s->count) < (XFS_LBSIZE(mp)/8)));
  	ASSERT(be16_to_cpu(hdr_s->firstused) >=
  		((be16_to_cpu(hdr_s->count)

  					* sizeof(*entry_s))+sizeof(*hdr_s)));

  	ASSERT(be16_to_cpu(hdr_d->count) < (XFS_LBSIZE(mp)/8));
  	ASSERT(be16_to_cpu(hdr_d->firstused) >=
  		((be16_to_cpu(hdr_d->count)

  					* sizeof(*entry_d))+sizeof(*hdr_d)));

  	ASSERT(start_s < be16_to_cpu(hdr_s->count));
  	ASSERT(start_d <= be16_to_cpu(hdr_d->count));
  	ASSERT(count <= be16_to_cpu(hdr_s->count));

  
  	/*
  	 * Move the entries in the destination leaf up to make a hole?
  	 */

  	if (start_d < be16_to_cpu(hdr_d->count)) {
  		tmp  = be16_to_cpu(hdr_d->count) - start_d;

  		tmp *= sizeof(xfs_attr_leaf_entry_t);
  		entry_s = &leaf_d->entries[start_d];
  		entry_d = &leaf_d->entries[start_d + count];
  		memmove((char *)entry_d, (char *)entry_s, tmp);
  	}
  
  	/*
  	 * Copy all entry's in the same (sorted) order,
  	 * but allocate attribute info packed and in sequence.
  	 */
  	entry_s = &leaf_s->entries[start_s];
  	entry_d = &leaf_d->entries[start_d];
  	desti = start_d;
  	for (i = 0; i < count; entry_s++, entry_d++, desti++, i++) {

  		ASSERT(be16_to_cpu(entry_s->nameidx)

  				>= be16_to_cpu(hdr_s->firstused));

  		tmp = xfs_attr_leaf_entsize(leaf_s, start_s + i);
  #ifdef GROT
  		/*
  		 * Code to drop INCOMPLETE entries.  Difficult to use as we
  		 * may also need to change the insertion index.  Code turned
  		 * off for 6.2, should be revisited later.
  		 */
  		if (entry_s->flags & XFS_ATTR_INCOMPLETE) { /* skip partials? */
  			memset(XFS_ATTR_LEAF_NAME(leaf_s, start_s + i), 0, tmp);

  			be16_add(&hdr_s->usedbytes, -tmp);
  			be16_add(&hdr_s->count, -1);

  			entry_d--;	/* to compensate for ++ in loop hdr */
  			desti--;
  			if ((start_s + i) < offset)
  				result++;	/* insertion index adjustment */
  		} else {
  #endif /* GROT */

  			be16_add(&hdr_d->firstused, -tmp);

  			/* both on-disk, don't endian flip twice */
  			entry_d->hashval = entry_s->hashval;
  			/* both on-disk, don't endian flip twice */
  			entry_d->nameidx = hdr_d->firstused;
  			entry_d->flags = entry_s->flags;

  			ASSERT(be16_to_cpu(entry_d->nameidx) + tmp

  							<= XFS_LBSIZE(mp));
  			memmove(XFS_ATTR_LEAF_NAME(leaf_d, desti),
  				XFS_ATTR_LEAF_NAME(leaf_s, start_s + i), tmp);

  			ASSERT(be16_to_cpu(entry_s->nameidx) + tmp

  							<= XFS_LBSIZE(mp));
  			memset(XFS_ATTR_LEAF_NAME(leaf_s, start_s + i), 0, tmp);

  			be16_add(&hdr_s->usedbytes, -tmp);
  			be16_add(&hdr_d->usedbytes, tmp);
  			be16_add(&hdr_s->count, -1);
  			be16_add(&hdr_d->count, 1);
  			tmp = be16_to_cpu(hdr_d->count)

  						* sizeof(xfs_attr_leaf_entry_t)
  						+ sizeof(xfs_attr_leaf_hdr_t);

  			ASSERT(be16_to_cpu(hdr_d->firstused) >= tmp);

  #ifdef GROT
  		}
  #endif /* GROT */
  	}
  
  	/*
  	 * Zero out the entries we just copied.
  	 */

  	if (start_s == be16_to_cpu(hdr_s->count)) {

  		tmp = count * sizeof(xfs_attr_leaf_entry_t);
  		entry_s = &leaf_s->entries[start_s];
  		ASSERT(((char *)entry_s + tmp) <=
  		       ((char *)leaf_s + XFS_LBSIZE(mp)));
  		memset((char *)entry_s, 0, tmp);
  	} else {
  		/*
  		 * Move the remaining entries down to fill the hole,
  		 * then zero the entries at the top.
  		 */

  		tmp  = be16_to_cpu(hdr_s->count) - count;

  		tmp *= sizeof(xfs_attr_leaf_entry_t);
  		entry_s = &leaf_s->entries[start_s + count];
  		entry_d = &leaf_s->entries[start_s];
  		memmove((char *)entry_d, (char *)entry_s, tmp);
  
  		tmp = count * sizeof(xfs_attr_leaf_entry_t);

  		entry_s = &leaf_s->entries[be16_to_cpu(hdr_s->count)];

  		ASSERT(((char *)entry_s + tmp) <=
  		       ((char *)leaf_s + XFS_LBSIZE(mp)));
  		memset((char *)entry_s, 0, tmp);
  	}
  
  	/*
  	 * Fill in the freemap information
  	 */

  	hdr_d->freemap[0].base = cpu_to_be16(sizeof(xfs_attr_leaf_hdr_t));
  	be16_add(&hdr_d->freemap[0].base, be16_to_cpu(hdr_d->count) *
  			sizeof(xfs_attr_leaf_entry_t));
  	hdr_d->freemap[0].size = cpu_to_be16(be16_to_cpu(hdr_d->firstused)
  			      - be16_to_cpu(hdr_d->freemap[0].base));

  	hdr_d->freemap[1].base = 0;
  	hdr_d->freemap[2].base = 0;
  	hdr_d->freemap[1].size = 0;
  	hdr_d->freemap[2].size = 0;
  	hdr_s->holes = 1;	/* leaf may not be compact */
  }
  
  /*
   * Compare two leaf blocks "order".
   * Return 0 unless leaf2 should go before leaf1.
   */
  int
  xfs_attr_leaf_order(xfs_dabuf_t *leaf1_bp, xfs_dabuf_t *leaf2_bp)
  {
  	xfs_attr_leafblock_t *leaf1, *leaf2;
  
  	leaf1 = leaf1_bp->data;
  	leaf2 = leaf2_bp->data;

  	ASSERT((be16_to_cpu(leaf1->hdr.info.magic) == XFS_ATTR_LEAF_MAGIC) &&
  	       (be16_to_cpu(leaf2->hdr.info.magic) == XFS_ATTR_LEAF_MAGIC));

  	if ((be16_to_cpu(leaf1->hdr.count) > 0) &&
  	    (be16_to_cpu(leaf2->hdr.count) > 0) &&

  	    ((be32_to_cpu(leaf2->entries[0].hashval) <
  	      be32_to_cpu(leaf1->entries[0].hashval)) ||
  	     (be32_to_cpu(leaf2->entries[
  			be16_to_cpu(leaf2->hdr.count)-1].hashval) <
  	      be32_to_cpu(leaf1->entries[
  			be16_to_cpu(leaf1->hdr.count)-1].hashval)))) {

  		return(1);
  	}
  	return(0);
  }
  
  /*
   * Pick up the last hashvalue from a leaf block.
   */
  xfs_dahash_t
  xfs_attr_leaf_lasthash(xfs_dabuf_t *bp, int *count)
  {
  	xfs_attr_leafblock_t *leaf;
  
  	leaf = bp->data;

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

  	if (count)

  		*count = be16_to_cpu(leaf->hdr.count);

  	if (!leaf->hdr.count)
  		return(0);

  	return be32_to_cpu(leaf->entries[be16_to_cpu(leaf->hdr.count)-1].hashval);

  }
  
  /*
   * Calculate the number of bytes used to store the indicated attribute
   * (whether local or remote only calculate bytes in this block).
   */

  STATIC int

  xfs_attr_leaf_entsize(xfs_attr_leafblock_t *leaf, int index)
  {
  	xfs_attr_leaf_name_local_t *name_loc;
  	xfs_attr_leaf_name_remote_t *name_rmt;
  	int size;

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

  	if (leaf->entries[index].flags & XFS_ATTR_LOCAL) {
  		name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, index);
  		size = XFS_ATTR_LEAF_ENTSIZE_LOCAL(name_loc->namelen,

  						   be16_to_cpu(name_loc->valuelen));

  	} else {
  		name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, index);
  		size = XFS_ATTR_LEAF_ENTSIZE_REMOTE(name_rmt->namelen);
  	}
  	return(size);
  }
  
  /*
   * Calculate the number of bytes that would be required to store the new
   * attribute (whether local or remote only calculate bytes in this block).
   * This routine decides as a side effect whether the attribute will be
   * a "local" or a "remote" attribute.
   */
  int

  xfs_attr_leaf_newentsize(int namelen, int valuelen, int blocksize, int *local)

  {
  	int size;

  	size = XFS_ATTR_LEAF_ENTSIZE_LOCAL(namelen, valuelen);

  	if (size < XFS_ATTR_LEAF_ENTSIZE_LOCAL_MAX(blocksize)) {
  		if (local) {
  			*local = 1;
  		}
  	} else {

  		size = XFS_ATTR_LEAF_ENTSIZE_REMOTE(namelen);

  		if (local) {
  			*local = 0;
  		}
  	}
  	return(size);
  }
  
  /*
   * Copy out attribute list entries for attr_list(), for leaf attribute lists.
   */
  int
  xfs_attr_leaf_list_int(xfs_dabuf_t *bp, xfs_attr_list_context_t *context)
  {
  	attrlist_cursor_kern_t *cursor;
  	xfs_attr_leafblock_t *leaf;
  	xfs_attr_leaf_entry_t *entry;

  	int retval, i;
  
  	ASSERT(bp != NULL);
  	leaf = bp->data;
  	cursor = context->cursor;
  	cursor->initted = 1;
  
  	xfs_attr_trace_l_cl("blk start", context, leaf);
  
  	/*
  	 * Re-find our place in the leaf block if this is a new syscall.
  	 */
  	if (context->resynch) {
  		entry = &leaf->entries[0];

  		for (i = 0; i < be16_to_cpu(leaf->hdr.count); entry++, i++) {

  			if (be32_to_cpu(entry->hashval) == cursor->hashval) {

  				if (cursor->offset == context->dupcnt) {
  					context->dupcnt = 0;
  					break;
  				}
  				context->dupcnt++;

  			} else if (be32_to_cpu(entry->hashval) >
  					cursor->hashval) {

  				context->dupcnt = 0;
  				break;
  			}
  		}

  		if (i == be16_to_cpu(leaf->hdr.count)) {

  			xfs_attr_trace_l_c("not found", context);
  			return(0);
  		}
  	} else {
  		entry = &leaf->entries[0];
  		i = 0;
  	}
  	context->resynch = 0;
  
  	/*
  	 * We have found our place, start copying out the new attributes.
  	 */
  	retval = 0;

  	for (  ; (i < be16_to_cpu(leaf->hdr.count)); entry++, i++) {
  		attrnames_t *namesp;

  		if (be32_to_cpu(entry->hashval) != cursor->hashval) {
  			cursor->hashval = be32_to_cpu(entry->hashval);

  			cursor->offset = 0;
  		}
  
  		if (entry->flags & XFS_ATTR_INCOMPLETE)
  			continue;		/* skip incomplete entries */

  		if (!xfs_attr_namesp_match_overrides(context->flags, entry->flags))
  			continue;
  
  		namesp = xfs_attr_flags_namesp(entry->flags);

  
  		if (entry->flags & XFS_ATTR_LOCAL) {

  			xfs_attr_leaf_name_local_t *name_loc =
  				XFS_ATTR_LEAF_NAME_LOCAL(leaf, i);
  
  			retval = context->put_listent(context,
  						namesp,
  						(char *)name_loc->nameval,
  						(int)name_loc->namelen,
  						be16_to_cpu(name_loc->valuelen),
  						(char *)&name_loc->nameval[name_loc->namelen]);
  			if (retval)
  				return retval;

  		} else {

  			xfs_attr_leaf_name_remote_t *name_rmt =
  				XFS_ATTR_LEAF_NAME_REMOTE(leaf, i);
  
  			int valuelen = be32_to_cpu(name_rmt->valuelen);
  
  			if (context->put_value) {
  				xfs_da_args_t args;
  
  				memset((char *)&args, 0, sizeof(args));
  				args.dp = context->dp;
  				args.whichfork = XFS_ATTR_FORK;
  				args.valuelen = valuelen;
  				args.value = kmem_alloc(valuelen, KM_SLEEP);
  				args.rmtblkno = be32_to_cpu(name_rmt->valueblk);
  				args.rmtblkcnt = XFS_B_TO_FSB(args.dp->i_mount, valuelen);
  				retval = xfs_attr_rmtval_get(&args);
  				if (retval)
  					return retval;
  				retval = context->put_listent(context,
  						namesp,
  						(char *)name_rmt->name,
  						(int)name_rmt->namelen,
  						valuelen,
  						(char*)args.value);
  				kmem_free(args.value, valuelen);

  			}

  			else {
  				retval = context->put_listent(context,
  						namesp,
  						(char *)name_rmt->name,
  						(int)name_rmt->namelen,
  						valuelen,
  						NULL);
  			}
  			if (retval)
  				return retval;

  		}

  		if (context->seen_enough)
  			break;
  		cursor->offset++;

  	}
  	xfs_attr_trace_l_cl("blk end", context, leaf);
  	return(retval);
  }

  
  /*========================================================================
   * Manage the INCOMPLETE flag in a leaf entry
   *========================================================================*/
  
  /*
   * Clear the INCOMPLETE flag on an entry in a leaf block.
   */
  int
  xfs_attr_leaf_clearflag(xfs_da_args_t *args)
  {
  	xfs_attr_leafblock_t *leaf;
  	xfs_attr_leaf_entry_t *entry;
  	xfs_attr_leaf_name_remote_t *name_rmt;
  	xfs_dabuf_t *bp;
  	int error;
  #ifdef DEBUG
  	xfs_attr_leaf_name_local_t *name_loc;
  	int namelen;
  	char *name;
  #endif /* DEBUG */
  
  	/*
  	 * Set up the operation.
  	 */
  	error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
  					     XFS_ATTR_FORK);
  	if (error) {
  		return(error);
  	}
  	ASSERT(bp != NULL);
  
  	leaf = bp->data;

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

  	ASSERT(args->index < be16_to_cpu(leaf->hdr.count));

  	ASSERT(args->index >= 0);
  	entry = &leaf->entries[ args->index ];
  	ASSERT(entry->flags & XFS_ATTR_INCOMPLETE);
  
  #ifdef DEBUG
  	if (entry->flags & XFS_ATTR_LOCAL) {
  		name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf, args->index);
  		namelen = name_loc->namelen;
  		name = (char *)name_loc->nameval;
  	} else {
  		name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, args->index);
  		namelen = name_rmt->namelen;
  		name = (char *)name_rmt->name;
  	}

  	ASSERT(be32_to_cpu(entry->hashval) == args->hashval);

  	ASSERT(namelen == args->namelen);
  	ASSERT(memcmp(name, args->name, namelen) == 0);
  #endif /* DEBUG */
  
  	entry->flags &= ~XFS_ATTR_INCOMPLETE;
  	xfs_da_log_buf(args->trans, bp,
  			 XFS_DA_LOGRANGE(leaf, entry, sizeof(*entry)));
  
  	if (args->rmtblkno) {
  		ASSERT((entry->flags & XFS_ATTR_LOCAL) == 0);
  		name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, args->index);

  		name_rmt->valueblk = cpu_to_be32(args->rmtblkno);
  		name_rmt->valuelen = cpu_to_be32(args->valuelen);

  		xfs_da_log_buf(args->trans, bp,
  			 XFS_DA_LOGRANGE(leaf, name_rmt, sizeof(*name_rmt)));
  	}
  	xfs_da_buf_done(bp);
  
  	/*
  	 * Commit the flag value change and start the next trans in series.
  	 */
  	error = xfs_attr_rolltrans(&args->trans, args->dp);
  
  	return(error);
  }
  
  /*
   * Set the INCOMPLETE flag on an entry in a leaf block.
   */
  int
  xfs_attr_leaf_setflag(xfs_da_args_t *args)
  {
  	xfs_attr_leafblock_t *leaf;
  	xfs_attr_leaf_entry_t *entry;
  	xfs_attr_leaf_name_remote_t *name_rmt;
  	xfs_dabuf_t *bp;
  	int error;
  
  	/*
  	 * Set up the operation.
  	 */
  	error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp,
  					     XFS_ATTR_FORK);
  	if (error) {
  		return(error);
  	}
  	ASSERT(bp != NULL);
  
  	leaf = bp->data;

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

  	ASSERT(args->index < be16_to_cpu(leaf->hdr.count));

  	ASSERT(args->index >= 0);
  	entry = &leaf->entries[ args->index ];
  
  	ASSERT((entry->flags & XFS_ATTR_INCOMPLETE) == 0);
  	entry->flags |= XFS_ATTR_INCOMPLETE;
  	xfs_da_log_buf(args->trans, bp,
  			XFS_DA_LOGRANGE(leaf, entry, sizeof(*entry)));
  	if ((entry->flags & XFS_ATTR_LOCAL) == 0) {
  		name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, args->index);
  		name_rmt->valueblk = 0;
  		name_rmt->valuelen = 0;
  		xfs_da_log_buf(args->trans, bp,
  			 XFS_DA_LOGRANGE(leaf, name_rmt, sizeof(*name_rmt)));
  	}
  	xfs_da_buf_done(bp);
  
  	/*
  	 * Commit the flag value change and start the next trans in series.
  	 */
  	error = xfs_attr_rolltrans(&args->trans, args->dp);
  
  	return(error);
  }
  
  /*
   * In a single transaction, clear the INCOMPLETE flag on the leaf entry
   * given by args->blkno/index and set the INCOMPLETE flag on the leaf
   * entry given by args->blkno2/index2.
   *
   * Note that they could be in different blocks, or in the same block.
   */
  int
  xfs_attr_leaf_flipflags(xfs_da_args_t *args)
  {
  	xfs_attr_leafblock_t *leaf1, *leaf2;
  	xfs_attr_leaf_entry_t *entry1, *entry2;
  	xfs_attr_leaf_name_remote_t *name_rmt;
  	xfs_dabuf_t *bp1, *bp2;
  	int error;
  #ifdef DEBUG
  	xfs_attr_leaf_name_local_t *name_loc;
  	int namelen1, namelen2;
  	char *name1, *name2;
  #endif /* DEBUG */
  
  	/*
  	 * Read the block containing the "old" attr
  	 */
  	error = xfs_da_read_buf(args->trans, args->dp, args->blkno, -1, &bp1,
  					     XFS_ATTR_FORK);
  	if (error) {
  		return(error);
  	}
  	ASSERT(bp1 != NULL);
  
  	/*
  	 * Read the block containing the "new" attr, if it is different
  	 */
  	if (args->blkno2 != args->blkno) {
  		error = xfs_da_read_buf(args->trans, args->dp, args->blkno2,
  					-1, &bp2, XFS_ATTR_FORK);
  		if (error) {
  			return(error);
  		}
  		ASSERT(bp2 != NULL);
  	} else {
  		bp2 = bp1;
  	}
  
  	leaf1 = bp1->data;

  	ASSERT(be16_to_cpu(leaf1->hdr.info.magic) == XFS_ATTR_LEAF_MAGIC);

  	ASSERT(args->index < be16_to_cpu(leaf1->hdr.count));

  	ASSERT(args->index >= 0);
  	entry1 = &leaf1->entries[ args->index ];
  
  	leaf2 = bp2->data;

  	ASSERT(be16_to_cpu(leaf2->hdr.info.magic) == XFS_ATTR_LEAF_MAGIC);

  	ASSERT(args->index2 < be16_to_cpu(leaf2->hdr.count));

  	ASSERT(args->index2 >= 0);
  	entry2 = &leaf2->entries[ args->index2 ];
  
  #ifdef DEBUG
  	if (entry1->flags & XFS_ATTR_LOCAL) {
  		name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf1, args->index);
  		namelen1 = name_loc->namelen;
  		name1 = (char *)name_loc->nameval;
  	} else {
  		name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf1, args->index);
  		namelen1 = name_rmt->namelen;
  		name1 = (char *)name_rmt->name;
  	}
  	if (entry2->flags & XFS_ATTR_LOCAL) {
  		name_loc = XFS_ATTR_LEAF_NAME_LOCAL(leaf2, args->index2);
  		namelen2 = name_loc->namelen;
  		name2 = (char *)name_loc->nameval;
  	} else {
  		name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf2, args->index2);
  		namelen2 = name_rmt->namelen;
  		name2 = (char *)name_rmt->name;
  	}

  	ASSERT(be32_to_cpu(entry1->hashval) == be32_to_cpu(entry2->hashval));

  	ASSERT(namelen1 == namelen2);
  	ASSERT(memcmp(name1, name2, namelen1) == 0);
  #endif /* DEBUG */
  
  	ASSERT(entry1->flags & XFS_ATTR_INCOMPLETE);
  	ASSERT((entry2->flags & XFS_ATTR_INCOMPLETE) == 0);
  
  	entry1->flags &= ~XFS_ATTR_INCOMPLETE;
  	xfs_da_log_buf(args->trans, bp1,
  			  XFS_DA_LOGRANGE(leaf1, entry1, sizeof(*entry1)));
  	if (args->rmtblkno) {
  		ASSERT((entry1->flags & XFS_ATTR_LOCAL) == 0);
  		name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf1, args->index);

  		name_rmt->valueblk = cpu_to_be32(args->rmtblkno);
  		name_rmt->valuelen = cpu_to_be32(args->valuelen);

  		xfs_da_log_buf(args->trans, bp1,
  			 XFS_DA_LOGRANGE(leaf1, name_rmt, sizeof(*name_rmt)));
  	}
  
  	entry2->flags |= XFS_ATTR_INCOMPLETE;
  	xfs_da_log_buf(args->trans, bp2,
  			  XFS_DA_LOGRANGE(leaf2, entry2, sizeof(*entry2)));
  	if ((entry2->flags & XFS_ATTR_LOCAL) == 0) {
  		name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf2, args->index2);
  		name_rmt->valueblk = 0;
  		name_rmt->valuelen = 0;
  		xfs_da_log_buf(args->trans, bp2,
  			 XFS_DA_LOGRANGE(leaf2, name_rmt, sizeof(*name_rmt)));
  	}
  	xfs_da_buf_done(bp1);
  	if (bp1 != bp2)
  		xfs_da_buf_done(bp2);
  
  	/*
  	 * Commit the flag value change and start the next trans in series.
  	 */
  	error = xfs_attr_rolltrans(&args->trans, args->dp);
  
  	return(error);
  }
  
  /*========================================================================
   * Indiscriminately delete the entire attribute fork
   *========================================================================*/
  
  /*
   * Recurse (gasp!) through the attribute nodes until we find leaves.
   * We're doing a depth-first traversal in order to invalidate everything.
   */
  int
  xfs_attr_root_inactive(xfs_trans_t **trans, xfs_inode_t *dp)
  {
  	xfs_da_blkinfo_t *info;
  	xfs_daddr_t blkno;
  	xfs_dabuf_t *bp;
  	int error;
  
  	/*
  	 * Read block 0 to see what we have to work with.
  	 * We only get here if we have extents, since we remove
  	 * the extents in reverse order the extent containing
  	 * block 0 must still be there.
  	 */
  	error = xfs_da_read_buf(*trans, dp, 0, -1, &bp, XFS_ATTR_FORK);
  	if (error)
  		return(error);
  	blkno = xfs_da_blkno(bp);
  
  	/*
  	 * Invalidate the tree, even if the "tree" is only a single leaf block.
  	 * This is a depth-first traversal!
  	 */
  	info = bp->data;

  	if (be16_to_cpu(info->magic) == XFS_DA_NODE_MAGIC) {

  		error = xfs_attr_node_inactive(trans, dp, bp, 1);

  	} else if (be16_to_cpu(info->magic) == XFS_ATTR_LEAF_MAGIC) {

  		error = xfs_attr_leaf_inactive(trans, dp, bp);
  	} else {
  		error = XFS_ERROR(EIO);
  		xfs_da_brelse(*trans, bp);
  	}
  	if (error)
  		return(error);
  
  	/*
  	 * Invalidate the incore copy of the root block.
  	 */
  	error = xfs_da_get_buf(*trans, dp, 0, blkno, &bp, XFS_ATTR_FORK);
  	if (error)
  		return(error);
  	xfs_da_binval(*trans, bp);	/* remove from cache */
  	/*
  	 * Commit the invalidate and start the next transaction.
  	 */
  	error = xfs_attr_rolltrans(trans, dp);
  
  	return (error);
  }
  
  /*
   * Recurse (gasp!) through the attribute nodes until we find leaves.
   * We're doing a depth-first traversal in order to invalidate everything.
   */

  STATIC int

  xfs_attr_node_inactive(xfs_trans_t **trans, xfs_inode_t *dp, xfs_dabuf_t *bp,
  				   int level)
  {
  	xfs_da_blkinfo_t *info;
  	xfs_da_intnode_t *node;
  	xfs_dablk_t child_fsb;
  	xfs_daddr_t parent_blkno, child_blkno;
  	int error, count, i;
  	xfs_dabuf_t *child_bp;
  
  	/*
  	 * Since this code is recursive (gasp!) we must protect ourselves.
  	 */
  	if (level > XFS_DA_NODE_MAXDEPTH) {
  		xfs_da_brelse(*trans, bp);	/* no locks for later trans */
  		return(XFS_ERROR(EIO));
  	}
  
  	node = bp->data;

  	ASSERT(be16_to_cpu(node->hdr.info.magic) == XFS_DA_NODE_MAGIC);

  	parent_blkno = xfs_da_blkno(bp);	/* save for re-read later */

  	count = be16_to_cpu(node->hdr.count);

  	if (!count) {
  		xfs_da_brelse(*trans, bp);
  		return(0);
  	}

  	child_fsb = be32_to_cpu(node->btree[0].before);

  	xfs_da_brelse(*trans, bp);	/* no locks for later trans */
  
  	/*
  	 * If this is the node level just above the leaves, simply loop
  	 * over the leaves removing all of them.  If this is higher up
  	 * in the tree, recurse downward.
  	 */
  	for (i = 0; i < count; i++) {
  		/*
  		 * Read the subsidiary block to see what we have to work with.
  		 * Don't do this in a transaction.  This is a depth-first
  		 * traversal of the tree so we may deal with many blocks
  		 * before we come back to this one.
  		 */
  		error = xfs_da_read_buf(*trans, dp, child_fsb, -2, &child_bp,
  						XFS_ATTR_FORK);
  		if (error)
  			return(error);
  		if (child_bp) {
  						/* save for re-read later */
  			child_blkno = xfs_da_blkno(child_bp);
  
  			/*
  			 * Invalidate the subtree, however we have to.
  			 */
  			info = child_bp->data;

  			if (be16_to_cpu(info->magic) == XFS_DA_NODE_MAGIC) {

  				error = xfs_attr_node_inactive(trans, dp,
  						child_bp, level+1);

  			} else if (be16_to_cpu(info->magic) == XFS_ATTR_LEAF_MAGIC) {

  				error = xfs_attr_leaf_inactive(trans, dp,
  						child_bp);
  			} else {
  				error = XFS_ERROR(EIO);
  				xfs_da_brelse(*trans, child_bp);
  			}
  			if (error)
  				return(error);
  
  			/*
  			 * Remove the subsidiary block from the cache
  			 * and from the log.
  			 */
  			error = xfs_da_get_buf(*trans, dp, 0, child_blkno,
  				&child_bp, XFS_ATTR_FORK);
  			if (error)
  				return(error);
  			xfs_da_binval(*trans, child_bp);
  		}
  
  		/*
  		 * If we're not done, re-read the parent to get the next
  		 * child block number.
  		 */
  		if ((i+1) < count) {
  			error = xfs_da_read_buf(*trans, dp, 0, parent_blkno,
  				&bp, XFS_ATTR_FORK);
  			if (error)
  				return(error);

  			child_fsb = be32_to_cpu(node->btree[i+1].before);

  			xfs_da_brelse(*trans, bp);
  		}
  		/*
  		 * Atomically commit the whole invalidate stuff.
  		 */
  		if ((error = xfs_attr_rolltrans(trans, dp)))
  			return (error);
  	}
  
  	return(0);
  }
  
  /*
   * Invalidate all of the "remote" value regions pointed to by a particular
   * leaf block.
   * Note that we must release the lock on the buffer so that we are not
   * caught holding something that the logging code wants to flush to disk.
   */

  STATIC int

  xfs_attr_leaf_inactive(xfs_trans_t **trans, xfs_inode_t *dp, xfs_dabuf_t *bp)
  {
  	xfs_attr_leafblock_t *leaf;
  	xfs_attr_leaf_entry_t *entry;
  	xfs_attr_leaf_name_remote_t *name_rmt;
  	xfs_attr_inactive_list_t *list, *lp;
  	int error, count, size, tmp, i;
  
  	leaf = bp->data;

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

  
  	/*
  	 * Count the number of "remote" value extents.
  	 */
  	count = 0;
  	entry = &leaf->entries[0];

  	for (i = 0; i < be16_to_cpu(leaf->hdr.count); entry++, i++) {

  		if (be16_to_cpu(entry->nameidx) &&
  		    ((entry->flags & XFS_ATTR_LOCAL) == 0)) {

  			name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, i);
  			if (name_rmt->valueblk)
  				count++;
  		}
  	}
  
  	/*
  	 * If there are no "remote" values, we're done.
  	 */
  	if (count == 0) {
  		xfs_da_brelse(*trans, bp);
  		return(0);
  	}
  
  	/*
  	 * Allocate storage for a list of all the "remote" value extents.
  	 */
  	size = count * sizeof(xfs_attr_inactive_list_t);
  	list = (xfs_attr_inactive_list_t *)kmem_alloc(size, KM_SLEEP);
  
  	/*
  	 * Identify each of the "remote" value extents.
  	 */
  	lp = list;
  	entry = &leaf->entries[0];

  	for (i = 0; i < be16_to_cpu(leaf->hdr.count); entry++, i++) {

  		if (be16_to_cpu(entry->nameidx) &&
  		    ((entry->flags & XFS_ATTR_LOCAL) == 0)) {

  			name_rmt = XFS_ATTR_LEAF_NAME_REMOTE(leaf, i);
  			if (name_rmt->valueblk) {

  				lp->valueblk = be32_to_cpu(name_rmt->valueblk);
  				lp->valuelen = XFS_B_TO_FSB(dp->i_mount,
  						    be32_to_cpu(name_rmt->valuelen));

  				lp++;
  			}
  		}
  	}
  	xfs_da_brelse(*trans, bp);	/* unlock for trans. in freextent() */
  
  	/*
  	 * Invalidate each of the "remote" value extents.
  	 */
  	error = 0;
  	for (lp = list, i = 0; i < count; i++, lp++) {
  		tmp = xfs_attr_leaf_freextent(trans, dp,

  				lp->valueblk, lp->valuelen);

  		if (error == 0)
  			error = tmp;	/* save only the 1st errno */
  	}
  
  	kmem_free((xfs_caddr_t)list, size);
  	return(error);
  }
  
  /*
   * Look at all the extents for this logical region,
   * invalidate any buffers that are incore/in transactions.
   */

  STATIC int

  xfs_attr_leaf_freextent(xfs_trans_t **trans, xfs_inode_t *dp,
  				    xfs_dablk_t blkno, int blkcnt)
  {
  	xfs_bmbt_irec_t map;
  	xfs_dablk_t tblkno;
  	int tblkcnt, dblkcnt, nmap, error;
  	xfs_daddr_t dblkno;
  	xfs_buf_t *bp;
  
  	/*
  	 * Roll through the "value", invalidating the attribute value's
  	 * blocks.
  	 */
  	tblkno = blkno;
  	tblkcnt = blkcnt;
  	while (tblkcnt > 0) {
  		/*
  		 * Try to remember where we decided to put the value.
  		 */
  		nmap = 1;
  		error = xfs_bmapi(*trans, dp, (xfs_fileoff_t)tblkno, tblkcnt,
  					XFS_BMAPI_ATTRFORK | XFS_BMAPI_METADATA,

  					NULL, 0, &map, &nmap, NULL, NULL);

  		if (error) {
  			return(error);
  		}
  		ASSERT(nmap == 1);
  		ASSERT(map.br_startblock != DELAYSTARTBLOCK);
  
  		/*
  		 * If it's a hole, these are already unmapped
  		 * so there's nothing to invalidate.
  		 */
  		if (map.br_startblock != HOLESTARTBLOCK) {
  
  			dblkno = XFS_FSB_TO_DADDR(dp->i_mount,
  						  map.br_startblock);
  			dblkcnt = XFS_FSB_TO_BB(dp->i_mount,
  						map.br_blockcount);
  			bp = xfs_trans_get_buf(*trans,
  					dp->i_mount->m_ddev_targp,
  					dblkno, dblkcnt, XFS_BUF_LOCK);
  			xfs_trans_binval(*trans, bp);
  			/*
  			 * Roll to next transaction.
  			 */
  			if ((error = xfs_attr_rolltrans(trans, dp)))
  				return (error);
  		}
  
  		tblkno += map.br_blockcount;
  		tblkcnt -= map.br_blockcount;
  	}
  
  	return(0);
  }
  
  
  /*
   * Roll from one trans in the sequence of PERMANENT transactions to the next.
   */
  int
  xfs_attr_rolltrans(xfs_trans_t **transp, xfs_inode_t *dp)
  {
  	xfs_trans_t *trans;
  	unsigned int logres, count;
  	int	error;
  
  	/*
  	 * Ensure that the inode is always logged.
  	 */
  	trans = *transp;
  	xfs_trans_log_inode(trans, dp, XFS_ILOG_CORE);
  
  	/*
  	 * Copy the critical parameters from one trans to the next.
  	 */
  	logres = trans->t_log_res;
  	count = trans->t_log_count;
  	*transp = xfs_trans_dup(trans);
  
  	/*
  	 * Commit the current transaction.
  	 * If this commit failed, then it'd just unlock those items that
  	 * are not marked ihold. That also means that a filesystem shutdown
  	 * is in progress. The caller takes the responsibility to cancel
  	 * the duplicate transaction that gets returned.
  	 */

  	if ((error = xfs_trans_commit(trans, 0)))

  		return (error);
  
  	trans = *transp;
  
  	/*
  	 * Reserve space in the log for th next transaction.
  	 * This also pushes items in the "AIL", the list of logged items,
  	 * out to disk if they are taking up space at the tail of the log
  	 * that we want to use.  This requires that either nothing be locked
  	 * across this call, or that anything that is locked be logged in
  	 * the prior and the next transactions.
  	 */
  	error = xfs_trans_reserve(trans, 0, logres, 0,
  				  XFS_TRANS_PERM_LOG_RES, count);
  	/*
  	 *  Ensure that the inode is in the new transaction and locked.
  	 */
  	if (!error) {
  		xfs_trans_ijoin(trans, dp, XFS_ILOCK_EXCL);
  		xfs_trans_ihold(trans, dp);
  	}
  	return (error);
  
  }