patch-2.4.25 linux-2.4.25/fs/xfs/xfs_dir2_block.c

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diff -urN linux-2.4.24/fs/xfs/xfs_dir2_block.c linux-2.4.25/fs/xfs/xfs_dir2_block.c
@@ -0,0 +1,1248 @@
+/*
+ * Copyright (c) 2000-2003 Silicon Graphics, Inc.  All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of version 2 of the GNU General Public License as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it would be useful, but
+ * WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
+ *
+ * Further, this software is distributed without any warranty that it is
+ * free of the rightful claim of any third person regarding infringement
+ * or the like.  Any license provided herein, whether implied or
+ * otherwise, applies only to this software file.  Patent licenses, if
+ * any, provided herein do not apply to combinations of this program with
+ * other software, or any other product whatsoever.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write the Free Software Foundation, Inc., 59
+ * Temple Place - Suite 330, Boston MA 02111-1307, USA.
+ *
+ * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
+ * Mountain View, CA  94043, or:
+ *
+ * http://www.sgi.com
+ *
+ * For further information regarding this notice, see:
+ *
+ * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
+ */
+
+/*
+ * xfs_dir2_block.c
+ * XFS V2 directory implementation, single-block form.
+ * See xfs_dir2_block.h for the format.
+ */
+
+#include "xfs.h"
+
+#include "xfs_macros.h"
+#include "xfs_types.h"
+#include "xfs_inum.h"
+#include "xfs_log.h"
+#include "xfs_trans.h"
+#include "xfs_sb.h"
+#include "xfs_dir.h"
+#include "xfs_dir2.h"
+#include "xfs_dmapi.h"
+#include "xfs_mount.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_attr_sf.h"
+#include "xfs_dir_sf.h"
+#include "xfs_dir2_sf.h"
+#include "xfs_dinode.h"
+#include "xfs_inode_item.h"
+#include "xfs_inode.h"
+#include "xfs_da_btree.h"
+#include "xfs_dir_leaf.h"
+#include "xfs_dir2_data.h"
+#include "xfs_dir2_leaf.h"
+#include "xfs_dir2_block.h"
+#include "xfs_dir2_trace.h"
+#include "xfs_error.h"
+
+/*
+ * Local function prototypes.
+ */
+static void xfs_dir2_block_log_leaf(xfs_trans_t *tp, xfs_dabuf_t *bp, int first,
+				    int last);
+static void xfs_dir2_block_log_tail(xfs_trans_t *tp, xfs_dabuf_t *bp);
+static int xfs_dir2_block_lookup_int(xfs_da_args_t *args, xfs_dabuf_t **bpp,
+				     int *entno);
+static int xfs_dir2_block_sort(const void *a, const void *b);
+
+/*
+ * Add an entry to a block directory.
+ */
+int						/* error */
+xfs_dir2_block_addname(
+	xfs_da_args_t		*args)		/* directory op arguments */
+{
+	xfs_dir2_data_free_t	*bf;		/* bestfree table in block */
+	xfs_dir2_block_t	*block;		/* directory block structure */
+	xfs_dir2_leaf_entry_t	*blp;		/* block leaf entries */
+	xfs_dabuf_t		*bp;		/* buffer for block */
+	xfs_dir2_block_tail_t	*btp;		/* block tail */
+	int			compact;	/* need to compact leaf ents */
+	xfs_dir2_data_entry_t	*dep;		/* block data entry */
+	xfs_inode_t		*dp;		/* directory inode */
+	xfs_dir2_data_unused_t	*dup;		/* block unused entry */
+	int			error;		/* error return value */
+	xfs_dir2_data_unused_t	*enddup=NULL;	/* unused at end of data */
+	xfs_dahash_t		hash;		/* hash value of found entry */
+	int			high;		/* high index for binary srch */
+	int			highstale;	/* high stale index */
+	int			lfloghigh=0;	/* last final leaf to log */
+	int			lfloglow=0;	/* first final leaf to log */
+	int			len;		/* length of the new entry */
+	int			low;		/* low index for binary srch */
+	int			lowstale;	/* low stale index */
+	int			mid=0;		/* midpoint for binary srch */
+	xfs_mount_t		*mp;		/* filesystem mount point */
+	int			needlog;	/* need to log header */
+	int			needscan;	/* need to rescan freespace */
+	xfs_dir2_data_off_t	*tagp;		/* pointer to tag value */
+	xfs_trans_t		*tp;		/* transaction structure */
+
+	xfs_dir2_trace_args("block_addname", args);
+	dp = args->dp;
+	tp = args->trans;
+	mp = dp->i_mount;
+	/*
+	 * Read the (one and only) directory block into dabuf bp.
+	 */
+	if ((error =
+	    xfs_da_read_buf(tp, dp, mp->m_dirdatablk, -1, &bp, XFS_DATA_FORK))) {
+		return error;
+	}
+	ASSERT(bp != NULL);
+	block = bp->data;
+	/*
+	 * Check the magic number, corrupted if wrong.
+	 */
+	if (unlikely(INT_GET(block->hdr.magic, ARCH_CONVERT)
+						!= XFS_DIR2_BLOCK_MAGIC)) {
+		XFS_CORRUPTION_ERROR("xfs_dir2_block_addname",
+				     XFS_ERRLEVEL_LOW, mp, block);
+		xfs_da_brelse(tp, bp);
+		return XFS_ERROR(EFSCORRUPTED);
+	}
+	len = XFS_DIR2_DATA_ENTSIZE(args->namelen);
+	/*
+	 * Set up pointers to parts of the block.
+	 */
+	bf = block->hdr.bestfree;
+	btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
+	blp = XFS_DIR2_BLOCK_LEAF_P_ARCH(btp, ARCH_CONVERT);
+	/*
+	 * No stale entries?  Need space for entry and new leaf.
+	 */
+	if (INT_ISZERO(btp->stale, ARCH_CONVERT)) {
+		/*
+		 * Tag just before the first leaf entry.
+		 */
+		tagp = (xfs_dir2_data_off_t *)blp - 1;
+		/*
+		 * Data object just before the first leaf entry.
+		 */
+		enddup = (xfs_dir2_data_unused_t *)((char *)block + INT_GET(*tagp, ARCH_CONVERT));
+		/*
+		 * If it's not free then can't do this add without cleaning up:
+		 * the space before the first leaf entry needs to be free so it
+		 * can be expanded to hold the pointer to the new entry.
+		 */
+		if (INT_GET(enddup->freetag, ARCH_CONVERT) != XFS_DIR2_DATA_FREE_TAG)
+			dup = enddup = NULL;
+		/*
+		 * Check out the biggest freespace and see if it's the same one.
+		 */
+		else {
+			dup = (xfs_dir2_data_unused_t *)
+			      ((char *)block + INT_GET(bf[0].offset, ARCH_CONVERT));
+			if (dup == enddup) {
+				/*
+				 * It is the biggest freespace, is it too small
+				 * to hold the new leaf too?
+				 */
+				if (INT_GET(dup->length, ARCH_CONVERT) < len + (uint)sizeof(*blp)) {
+					/*
+					 * Yes, we use the second-largest
+					 * entry instead if it works.
+					 */
+					if (INT_GET(bf[1].length, ARCH_CONVERT) >= len)
+						dup = (xfs_dir2_data_unused_t *)
+						      ((char *)block +
+						       INT_GET(bf[1].offset, ARCH_CONVERT));
+					else
+						dup = NULL;
+				}
+			} else {
+				/*
+				 * Not the same free entry,
+				 * just check its length.
+				 */
+				if (INT_GET(dup->length, ARCH_CONVERT) < len) {
+					dup = NULL;
+				}
+			}
+		}
+		compact = 0;
+	}
+	/*
+	 * If there are stale entries we'll use one for the leaf.
+	 * Is the biggest entry enough to avoid compaction?
+	 */
+	else if (INT_GET(bf[0].length, ARCH_CONVERT) >= len) {
+		dup = (xfs_dir2_data_unused_t *)
+		      ((char *)block + INT_GET(bf[0].offset, ARCH_CONVERT));
+		compact = 0;
+	}
+	/*
+	 * Will need to compact to make this work.
+	 */
+	else {
+		/*
+		 * Tag just before the first leaf entry.
+		 */
+		tagp = (xfs_dir2_data_off_t *)blp - 1;
+		/*
+		 * Data object just before the first leaf entry.
+		 */
+		dup = (xfs_dir2_data_unused_t *)((char *)block + INT_GET(*tagp, ARCH_CONVERT));
+		/*
+		 * If it's not free then the data will go where the
+		 * leaf data starts now, if it works at all.
+		 */
+		if (INT_GET(dup->freetag, ARCH_CONVERT) == XFS_DIR2_DATA_FREE_TAG) {
+			if (INT_GET(dup->length, ARCH_CONVERT) + (INT_GET(btp->stale, ARCH_CONVERT) - 1) *
+			    (uint)sizeof(*blp) < len)
+				dup = NULL;
+		} else if ((INT_GET(btp->stale, ARCH_CONVERT) - 1) * (uint)sizeof(*blp) < len)
+			dup = NULL;
+		else
+			dup = (xfs_dir2_data_unused_t *)blp;
+		compact = 1;
+	}
+	/*
+	 * If this isn't a real add, we're done with the buffer.
+	 */
+	if (args->justcheck)
+		xfs_da_brelse(tp, bp);
+	/*
+	 * If we don't have space for the new entry & leaf ...
+	 */
+	if (!dup) {
+		/*
+		 * Not trying to actually do anything, or don't have
+		 * a space reservation: return no-space.
+		 */
+		if (args->justcheck || args->total == 0)
+			return XFS_ERROR(ENOSPC);
+		/*
+		 * Convert to the next larger format.
+		 * Then add the new entry in that format.
+		 */
+		error = xfs_dir2_block_to_leaf(args, bp);
+		xfs_da_buf_done(bp);
+		if (error)
+			return error;
+		return xfs_dir2_leaf_addname(args);
+	}
+	/*
+	 * Just checking, and it would work, so say so.
+	 */
+	if (args->justcheck)
+		return 0;
+	needlog = needscan = 0;
+	/*
+	 * If need to compact the leaf entries, do it now.
+	 * Leave the highest-numbered stale entry stale.
+	 * XXX should be the one closest to mid but mid is not yet computed.
+	 */
+	if (compact) {
+		int	fromidx;		/* source leaf index */
+		int	toidx;			/* target leaf index */
+
+		for (fromidx = toidx = INT_GET(btp->count, ARCH_CONVERT) - 1,
+			highstale = lfloghigh = -1;
+		     fromidx >= 0;
+		     fromidx--) {
+			if (INT_GET(blp[fromidx].address, ARCH_CONVERT) == XFS_DIR2_NULL_DATAPTR) {
+				if (highstale == -1)
+					highstale = toidx;
+				else {
+					if (lfloghigh == -1)
+						lfloghigh = toidx;
+					continue;
+				}
+			}
+			if (fromidx < toidx)
+				blp[toidx] = blp[fromidx];
+			toidx--;
+		}
+		lfloglow = toidx + 1 - (INT_GET(btp->stale, ARCH_CONVERT) - 1);
+		lfloghigh -= INT_GET(btp->stale, ARCH_CONVERT) - 1;
+		INT_MOD(btp->count, ARCH_CONVERT, -(INT_GET(btp->stale, ARCH_CONVERT) - 1));
+		xfs_dir2_data_make_free(tp, bp,
+			(xfs_dir2_data_aoff_t)((char *)blp - (char *)block),
+			(xfs_dir2_data_aoff_t)((INT_GET(btp->stale, ARCH_CONVERT) - 1) * sizeof(*blp)),
+			&needlog, &needscan);
+		blp += INT_GET(btp->stale, ARCH_CONVERT) - 1;
+		INT_SET(btp->stale, ARCH_CONVERT, 1);
+		/*
+		 * If we now need to rebuild the bestfree map, do so.
+		 * This needs to happen before the next call to use_free.
+		 */
+		if (needscan) {
+			xfs_dir2_data_freescan(mp, (xfs_dir2_data_t *)block,
+				&needlog, NULL);
+			needscan = 0;
+		}
+	}
+	/*
+	 * Set leaf logging boundaries to impossible state.
+	 * For the no-stale case they're set explicitly.
+	 */
+	else if (INT_GET(btp->stale, ARCH_CONVERT)) {
+		lfloglow = INT_GET(btp->count, ARCH_CONVERT);
+		lfloghigh = -1;
+	}
+	/*
+	 * Find the slot that's first lower than our hash value, -1 if none.
+	 */
+	for (low = 0, high = INT_GET(btp->count, ARCH_CONVERT) - 1; low <= high; ) {
+		mid = (low + high) >> 1;
+		if ((hash = INT_GET(blp[mid].hashval, ARCH_CONVERT)) == args->hashval)
+			break;
+		if (hash < args->hashval)
+			low = mid + 1;
+		else
+			high = mid - 1;
+	}
+	while (mid >= 0 && INT_GET(blp[mid].hashval, ARCH_CONVERT) >= args->hashval) {
+		mid--;
+	}
+	/*
+	 * No stale entries, will use enddup space to hold new leaf.
+	 */
+	if (INT_ISZERO(btp->stale, ARCH_CONVERT)) {
+		/*
+		 * Mark the space needed for the new leaf entry, now in use.
+		 */
+		xfs_dir2_data_use_free(tp, bp, enddup,
+			(xfs_dir2_data_aoff_t)
+			((char *)enddup - (char *)block + INT_GET(enddup->length, ARCH_CONVERT) -
+			 sizeof(*blp)),
+			(xfs_dir2_data_aoff_t)sizeof(*blp),
+			&needlog, &needscan);
+		/*
+		 * Update the tail (entry count).
+		 */
+		INT_MOD(btp->count, ARCH_CONVERT, +1);
+		/*
+		 * If we now need to rebuild the bestfree map, do so.
+		 * This needs to happen before the next call to use_free.
+		 */
+		if (needscan) {
+			xfs_dir2_data_freescan(mp, (xfs_dir2_data_t *)block,
+				&needlog, NULL);
+			needscan = 0;
+		}
+		/*
+		 * Adjust pointer to the first leaf entry, we're about to move
+		 * the table up one to open up space for the new leaf entry.
+		 * Then adjust our index to match.
+		 */
+		blp--;
+		mid++;
+		if (mid)
+			memmove(blp, &blp[1], mid * sizeof(*blp));
+		lfloglow = 0;
+		lfloghigh = mid;
+	}
+	/*
+	 * Use a stale leaf for our new entry.
+	 */
+	else {
+		for (lowstale = mid;
+		     lowstale >= 0 &&
+			INT_GET(blp[lowstale].address, ARCH_CONVERT) != XFS_DIR2_NULL_DATAPTR;
+		     lowstale--)
+			continue;
+		for (highstale = mid + 1;
+		     highstale < INT_GET(btp->count, ARCH_CONVERT) &&
+			INT_GET(blp[highstale].address, ARCH_CONVERT) != XFS_DIR2_NULL_DATAPTR &&
+			(lowstale < 0 || mid - lowstale > highstale - mid);
+		     highstale++)
+			continue;
+		/*
+		 * Move entries toward the low-numbered stale entry.
+		 */
+		if (lowstale >= 0 &&
+		    (highstale == INT_GET(btp->count, ARCH_CONVERT) ||
+		     mid - lowstale <= highstale - mid)) {
+			if (mid - lowstale)
+				memmove(&blp[lowstale], &blp[lowstale + 1],
+					(mid - lowstale) * sizeof(*blp));
+			lfloglow = MIN(lowstale, lfloglow);
+			lfloghigh = MAX(mid, lfloghigh);
+		}
+		/*
+		 * Move entries toward the high-numbered stale entry.
+		 */
+		else {
+			ASSERT(highstale < INT_GET(btp->count, ARCH_CONVERT));
+			mid++;
+			if (highstale - mid)
+				memmove(&blp[mid + 1], &blp[mid],
+					(highstale - mid) * sizeof(*blp));
+			lfloglow = MIN(mid, lfloglow);
+			lfloghigh = MAX(highstale, lfloghigh);
+		}
+		INT_MOD(btp->stale, ARCH_CONVERT, -1);
+	}
+	/*
+	 * Point to the new data entry.
+	 */
+	dep = (xfs_dir2_data_entry_t *)dup;
+	/*
+	 * Fill in the leaf entry.
+	 */
+	INT_SET(blp[mid].hashval, ARCH_CONVERT, args->hashval);
+	INT_SET(blp[mid].address, ARCH_CONVERT, XFS_DIR2_BYTE_TO_DATAPTR(mp, (char *)dep - (char *)block));
+	xfs_dir2_block_log_leaf(tp, bp, lfloglow, lfloghigh);
+	/*
+	 * Mark space for the data entry used.
+	 */
+	xfs_dir2_data_use_free(tp, bp, dup,
+		(xfs_dir2_data_aoff_t)((char *)dup - (char *)block),
+		(xfs_dir2_data_aoff_t)len, &needlog, &needscan);
+	/*
+	 * Create the new data entry.
+	 */
+	INT_SET(dep->inumber, ARCH_CONVERT, args->inumber);
+	dep->namelen = args->namelen;
+	memcpy(dep->name, args->name, args->namelen);
+	tagp = XFS_DIR2_DATA_ENTRY_TAG_P(dep);
+	INT_SET(*tagp, ARCH_CONVERT, (xfs_dir2_data_off_t)((char *)dep - (char *)block));
+	/*
+	 * Clean up the bestfree array and log the header, tail, and entry.
+	 */
+	if (needscan)
+		xfs_dir2_data_freescan(mp, (xfs_dir2_data_t *)block, &needlog,
+			NULL);
+	if (needlog)
+		xfs_dir2_data_log_header(tp, bp);
+	xfs_dir2_block_log_tail(tp, bp);
+	xfs_dir2_data_log_entry(tp, bp, dep);
+	xfs_dir2_data_check(dp, bp);
+	xfs_da_buf_done(bp);
+	return 0;
+}
+
+/*
+ * Readdir for block directories.
+ */
+int						/* error */
+xfs_dir2_block_getdents(
+	xfs_trans_t		*tp,		/* transaction (NULL) */
+	xfs_inode_t		*dp,		/* incore inode */
+	uio_t			*uio,		/* caller's buffer control */
+	int			*eofp,		/* eof reached? (out) */
+	xfs_dirent_t		*dbp,		/* caller's buffer */
+	xfs_dir2_put_t		put)		/* abi's formatting function */
+{
+	xfs_dir2_block_t	*block;		/* directory block structure */
+	xfs_dabuf_t		*bp;		/* buffer for block */
+	xfs_dir2_block_tail_t	*btp;		/* block tail */
+	xfs_dir2_data_entry_t	*dep;		/* block data entry */
+	xfs_dir2_data_unused_t	*dup;		/* block unused entry */
+	char			*endptr;	/* end of the data entries */
+	int			error;		/* error return value */
+	xfs_mount_t		*mp;		/* filesystem mount point */
+	xfs_dir2_put_args_t	p;		/* arg package for put rtn */
+	char			*ptr;		/* current data entry */
+	int			wantoff;	/* starting block offset */
+
+	mp = dp->i_mount;
+	/*
+	 * If the block number in the offset is out of range, we're done.
+	 */
+	if (XFS_DIR2_DATAPTR_TO_DB(mp, uio->uio_offset) > mp->m_dirdatablk) {
+		*eofp = 1;
+		return 0;
+	}
+	/*
+	 * Can't read the block, give up, else get dabuf in bp.
+	 */
+	if ((error =
+	    xfs_da_read_buf(tp, dp, mp->m_dirdatablk, -1, &bp, XFS_DATA_FORK))) {
+		return error;
+	}
+	ASSERT(bp != NULL);
+	/*
+	 * Extract the byte offset we start at from the seek pointer.
+	 * We'll skip entries before this.
+	 */
+	wantoff = XFS_DIR2_DATAPTR_TO_OFF(mp, uio->uio_offset);
+	block = bp->data;
+	xfs_dir2_data_check(dp, bp);
+	/*
+	 * Set up values for the loop.
+	 */
+	btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
+	ptr = (char *)block->u;
+	endptr = (char *)XFS_DIR2_BLOCK_LEAF_P_ARCH(btp, ARCH_CONVERT);
+	p.dbp = dbp;
+	p.put = put;
+	p.uio = uio;
+	/*
+	 * Loop over the data portion of the block.
+	 * Each object is a real entry (dep) or an unused one (dup).
+	 */
+	while (ptr < endptr) {
+		dup = (xfs_dir2_data_unused_t *)ptr;
+		/*
+		 * Unused, skip it.
+		 */
+		if (INT_GET(dup->freetag, ARCH_CONVERT) == XFS_DIR2_DATA_FREE_TAG) {
+			ptr += INT_GET(dup->length, ARCH_CONVERT);
+			continue;
+		}
+
+		dep = (xfs_dir2_data_entry_t *)ptr;
+
+		/*
+		 * Bump pointer for the next iteration.
+		 */
+		ptr += XFS_DIR2_DATA_ENTSIZE(dep->namelen);
+		/*
+		 * The entry is before the desired starting point, skip it.
+		 */
+		if ((char *)dep - (char *)block < wantoff)
+			continue;
+		/*
+		 * Set up argument structure for put routine.
+		 */
+		p.namelen = dep->namelen;
+
+		p.cook = XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk,
+						    ptr - (char *)block);
+		p.ino = INT_GET(dep->inumber, ARCH_CONVERT);
+#if XFS_BIG_INUMS
+		p.ino += mp->m_inoadd;
+#endif
+		p.name = (char *)dep->name;
+
+		/*
+		 * Put the entry in the caller's buffer.
+		 */
+		error = p.put(&p);
+
+		/*
+		 * If it didn't fit, set the final offset to here & return.
+		 */
+		if (!p.done) {
+			uio->uio_offset =
+				XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk,
+					(char *)dep - (char *)block);
+			xfs_da_brelse(tp, bp);
+			return error;
+		}
+	}
+
+	/*
+	 * Reached the end of the block.
+	 * Set the offset to a nonexistent block 1 and return.
+	 */
+	*eofp = 1;
+
+	uio->uio_offset =
+		XFS_DIR2_DB_OFF_TO_DATAPTR(mp, mp->m_dirdatablk + 1, 0);
+
+	xfs_da_brelse(tp, bp);
+
+	return 0;
+}
+
+/*
+ * Log leaf entries from the block.
+ */
+static void
+xfs_dir2_block_log_leaf(
+	xfs_trans_t		*tp,		/* transaction structure */
+	xfs_dabuf_t		*bp,		/* block buffer */
+	int			first,		/* index of first logged leaf */
+	int			last)		/* index of last logged leaf */
+{
+	xfs_dir2_block_t	*block;		/* directory block structure */
+	xfs_dir2_leaf_entry_t	*blp;		/* block leaf entries */
+	xfs_dir2_block_tail_t	*btp;		/* block tail */
+	xfs_mount_t		*mp;		/* filesystem mount point */
+
+	mp = tp->t_mountp;
+	block = bp->data;
+	btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
+	blp = XFS_DIR2_BLOCK_LEAF_P_ARCH(btp, ARCH_CONVERT);
+	xfs_da_log_buf(tp, bp, (uint)((char *)&blp[first] - (char *)block),
+		(uint)((char *)&blp[last + 1] - (char *)block - 1));
+}
+
+/*
+ * Log the block tail.
+ */
+static void
+xfs_dir2_block_log_tail(
+	xfs_trans_t		*tp,		/* transaction structure */
+	xfs_dabuf_t		*bp)		/* block buffer */
+{
+	xfs_dir2_block_t	*block;		/* directory block structure */
+	xfs_dir2_block_tail_t	*btp;		/* block tail */
+	xfs_mount_t		*mp;		/* filesystem mount point */
+
+	mp = tp->t_mountp;
+	block = bp->data;
+	btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
+	xfs_da_log_buf(tp, bp, (uint)((char *)btp - (char *)block),
+		(uint)((char *)(btp + 1) - (char *)block - 1));
+}
+
+/*
+ * Look up an entry in the block.  This is the external routine,
+ * xfs_dir2_block_lookup_int does the real work.
+ */
+int						/* error */
+xfs_dir2_block_lookup(
+	xfs_da_args_t		*args)		/* dir lookup arguments */
+{
+	xfs_dir2_block_t	*block;		/* block structure */
+	xfs_dir2_leaf_entry_t	*blp;		/* block leaf entries */
+	xfs_dabuf_t		*bp;		/* block buffer */
+	xfs_dir2_block_tail_t	*btp;		/* block tail */
+	xfs_dir2_data_entry_t	*dep;		/* block data entry */
+	xfs_inode_t		*dp;		/* incore inode */
+	int			ent;		/* entry index */
+	int			error;		/* error return value */
+	xfs_mount_t		*mp;		/* filesystem mount point */
+
+	xfs_dir2_trace_args("block_lookup", args);
+	/*
+	 * Get the buffer, look up the entry.
+	 * If not found (ENOENT) then return, have no buffer.
+	 */
+	if ((error = xfs_dir2_block_lookup_int(args, &bp, &ent)))
+		return error;
+	dp = args->dp;
+	mp = dp->i_mount;
+	block = bp->data;
+	xfs_dir2_data_check(dp, bp);
+	btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
+	blp = XFS_DIR2_BLOCK_LEAF_P_ARCH(btp, ARCH_CONVERT);
+	/*
+	 * Get the offset from the leaf entry, to point to the data.
+	 */
+	dep = (xfs_dir2_data_entry_t *)
+	      ((char *)block + XFS_DIR2_DATAPTR_TO_OFF(mp, INT_GET(blp[ent].address, ARCH_CONVERT)));
+	/*
+	 * Fill in inode number, release the block.
+	 */
+	args->inumber = INT_GET(dep->inumber, ARCH_CONVERT);
+	xfs_da_brelse(args->trans, bp);
+	return XFS_ERROR(EEXIST);
+}
+
+/*
+ * Internal block lookup routine.
+ */
+static int					/* error */
+xfs_dir2_block_lookup_int(
+	xfs_da_args_t		*args,		/* dir lookup arguments */
+	xfs_dabuf_t		**bpp,		/* returned block buffer */
+	int			*entno)		/* returned entry number */
+{
+	xfs_dir2_dataptr_t	addr;		/* data entry address */
+	xfs_dir2_block_t	*block;		/* block structure */
+	xfs_dir2_leaf_entry_t	*blp;		/* block leaf entries */
+	xfs_dabuf_t		*bp;		/* block buffer */
+	xfs_dir2_block_tail_t	*btp;		/* block tail */
+	xfs_dir2_data_entry_t	*dep;		/* block data entry */
+	xfs_inode_t		*dp;		/* incore inode */
+	int			error;		/* error return value */
+	xfs_dahash_t		hash;		/* found hash value */
+	int			high;		/* binary search high index */
+	int			low;		/* binary search low index */
+	int			mid;		/* binary search current idx */
+	xfs_mount_t		*mp;		/* filesystem mount point */
+	xfs_trans_t		*tp;		/* transaction pointer */
+
+	dp = args->dp;
+	tp = args->trans;
+	mp = dp->i_mount;
+	/*
+	 * Read the buffer, return error if we can't get it.
+	 */
+	if ((error =
+	    xfs_da_read_buf(tp, dp, mp->m_dirdatablk, -1, &bp, XFS_DATA_FORK))) {
+		return error;
+	}
+	ASSERT(bp != NULL);
+	block = bp->data;
+	xfs_dir2_data_check(dp, bp);
+	btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
+	blp = XFS_DIR2_BLOCK_LEAF_P_ARCH(btp, ARCH_CONVERT);
+	/*
+	 * Loop doing a binary search for our hash value.
+	 * Find our entry, ENOENT if it's not there.
+	 */
+	for (low = 0, high = INT_GET(btp->count, ARCH_CONVERT) - 1; ; ) {
+		ASSERT(low <= high);
+		mid = (low + high) >> 1;
+		if ((hash = INT_GET(blp[mid].hashval, ARCH_CONVERT)) == args->hashval)
+			break;
+		if (hash < args->hashval)
+			low = mid + 1;
+		else
+			high = mid - 1;
+		if (low > high) {
+			ASSERT(args->oknoent);
+			xfs_da_brelse(tp, bp);
+			return XFS_ERROR(ENOENT);
+		}
+	}
+	/*
+	 * Back up to the first one with the right hash value.
+	 */
+	while (mid > 0 && INT_GET(blp[mid - 1].hashval, ARCH_CONVERT) == args->hashval) {
+		mid--;
+	}
+	/*
+	 * Now loop forward through all the entries with the
+	 * right hash value looking for our name.
+	 */
+	do {
+		if ((addr = INT_GET(blp[mid].address, ARCH_CONVERT)) == XFS_DIR2_NULL_DATAPTR)
+			continue;
+		/*
+		 * Get pointer to the entry from the leaf.
+		 */
+		dep = (xfs_dir2_data_entry_t *)
+			((char *)block + XFS_DIR2_DATAPTR_TO_OFF(mp, addr));
+		/*
+		 * Compare, if it's right give back buffer & entry number.
+		 */
+		if (dep->namelen == args->namelen &&
+		    dep->name[0] == args->name[0] &&
+		    memcmp(dep->name, args->name, args->namelen) == 0) {
+			*bpp = bp;
+			*entno = mid;
+			return 0;
+		}
+	} while (++mid < INT_GET(btp->count, ARCH_CONVERT) && INT_GET(blp[mid].hashval, ARCH_CONVERT) == hash);
+	/*
+	 * No match, release the buffer and return ENOENT.
+	 */
+	ASSERT(args->oknoent);
+	xfs_da_brelse(tp, bp);
+	return XFS_ERROR(ENOENT);
+}
+
+/*
+ * Remove an entry from a block format directory.
+ * If that makes the block small enough to fit in shortform, transform it.
+ */
+int						/* error */
+xfs_dir2_block_removename(
+	xfs_da_args_t		*args)		/* directory operation args */
+{
+	xfs_dir2_block_t	*block;		/* block structure */
+	xfs_dir2_leaf_entry_t	*blp;		/* block leaf pointer */
+	xfs_dabuf_t		*bp;		/* block buffer */
+	xfs_dir2_block_tail_t	*btp;		/* block tail */
+	xfs_dir2_data_entry_t	*dep;		/* block data entry */
+	xfs_inode_t		*dp;		/* incore inode */
+	int			ent;		/* block leaf entry index */
+	int			error;		/* error return value */
+	xfs_mount_t		*mp;		/* filesystem mount point */
+	int			needlog;	/* need to log block header */
+	int			needscan;	/* need to fixup bestfree */
+	xfs_dir2_sf_hdr_t	sfh;		/* shortform header */
+	int			size;		/* shortform size */
+	xfs_trans_t		*tp;		/* transaction pointer */
+
+	xfs_dir2_trace_args("block_removename", args);
+	/*
+	 * Look up the entry in the block.  Gets the buffer and entry index.
+	 * It will always be there, the vnodeops level does a lookup first.
+	 */
+	if ((error = xfs_dir2_block_lookup_int(args, &bp, &ent))) {
+		return error;
+	}
+	dp = args->dp;
+	tp = args->trans;
+	mp = dp->i_mount;
+	block = bp->data;
+	btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
+	blp = XFS_DIR2_BLOCK_LEAF_P_ARCH(btp, ARCH_CONVERT);
+	/*
+	 * Point to the data entry using the leaf entry.
+	 */
+	dep = (xfs_dir2_data_entry_t *)
+	      ((char *)block + XFS_DIR2_DATAPTR_TO_OFF(mp, INT_GET(blp[ent].address, ARCH_CONVERT)));
+	/*
+	 * Mark the data entry's space free.
+	 */
+	needlog = needscan = 0;
+	xfs_dir2_data_make_free(tp, bp,
+		(xfs_dir2_data_aoff_t)((char *)dep - (char *)block),
+		XFS_DIR2_DATA_ENTSIZE(dep->namelen), &needlog, &needscan);
+	/*
+	 * Fix up the block tail.
+	 */
+	INT_MOD(btp->stale, ARCH_CONVERT, +1);
+	xfs_dir2_block_log_tail(tp, bp);
+	/*
+	 * Remove the leaf entry by marking it stale.
+	 */
+	INT_SET(blp[ent].address, ARCH_CONVERT, XFS_DIR2_NULL_DATAPTR);
+	xfs_dir2_block_log_leaf(tp, bp, ent, ent);
+	/*
+	 * Fix up bestfree, log the header if necessary.
+	 */
+	if (needscan)
+		xfs_dir2_data_freescan(mp, (xfs_dir2_data_t *)block, &needlog,
+			NULL);
+	if (needlog)
+		xfs_dir2_data_log_header(tp, bp);
+	xfs_dir2_data_check(dp, bp);
+	/*
+	 * See if the size as a shortform is good enough.
+	 */
+	if ((size = xfs_dir2_block_sfsize(dp, block, &sfh)) >
+	    XFS_IFORK_DSIZE(dp)) {
+		xfs_da_buf_done(bp);
+		return 0;
+	}
+	/*
+	 * If it works, do the conversion.
+	 */
+	return xfs_dir2_block_to_sf(args, bp, size, &sfh);
+}
+
+/*
+ * Replace an entry in a V2 block directory.
+ * Change the inode number to the new value.
+ */
+int						/* error */
+xfs_dir2_block_replace(
+	xfs_da_args_t		*args)		/* directory operation args */
+{
+	xfs_dir2_block_t	*block;		/* block structure */
+	xfs_dir2_leaf_entry_t	*blp;		/* block leaf entries */
+	xfs_dabuf_t		*bp;		/* block buffer */
+	xfs_dir2_block_tail_t	*btp;		/* block tail */
+	xfs_dir2_data_entry_t	*dep;		/* block data entry */
+	xfs_inode_t		*dp;		/* incore inode */
+	int			ent;		/* leaf entry index */
+	int			error;		/* error return value */
+	xfs_mount_t		*mp;		/* filesystem mount point */
+
+	xfs_dir2_trace_args("block_replace", args);
+	/*
+	 * Lookup the entry in the directory.  Get buffer and entry index.
+	 * This will always succeed since the caller has already done a lookup.
+	 */
+	if ((error = xfs_dir2_block_lookup_int(args, &bp, &ent))) {
+		return error;
+	}
+	dp = args->dp;
+	mp = dp->i_mount;
+	block = bp->data;
+	btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
+	blp = XFS_DIR2_BLOCK_LEAF_P_ARCH(btp, ARCH_CONVERT);
+	/*
+	 * Point to the data entry we need to change.
+	 */
+	dep = (xfs_dir2_data_entry_t *)
+	      ((char *)block + XFS_DIR2_DATAPTR_TO_OFF(mp, INT_GET(blp[ent].address, ARCH_CONVERT)));
+	ASSERT(INT_GET(dep->inumber, ARCH_CONVERT) != args->inumber);
+	/*
+	 * Change the inode number to the new value.
+	 */
+	INT_SET(dep->inumber, ARCH_CONVERT, args->inumber);
+	xfs_dir2_data_log_entry(args->trans, bp, dep);
+	xfs_dir2_data_check(dp, bp);
+	xfs_da_buf_done(bp);
+	return 0;
+}
+
+/*
+ * Qsort comparison routine for the block leaf entries.
+ */
+static int					/* sort order */
+xfs_dir2_block_sort(
+	const void			*a,	/* first leaf entry */
+	const void			*b)	/* second leaf entry */
+{
+	const xfs_dir2_leaf_entry_t	*la;	/* first leaf entry */
+	const xfs_dir2_leaf_entry_t	*lb;	/* second leaf entry */
+
+	la = a;
+	lb = b;
+	return INT_GET(la->hashval, ARCH_CONVERT) < INT_GET(lb->hashval, ARCH_CONVERT) ? -1 :
+		(INT_GET(la->hashval, ARCH_CONVERT) > INT_GET(lb->hashval, ARCH_CONVERT) ? 1 : 0);
+}
+
+/*
+ * Convert a V2 leaf directory to a V2 block directory if possible.
+ */
+int						/* error */
+xfs_dir2_leaf_to_block(
+	xfs_da_args_t		*args,		/* operation arguments */
+	xfs_dabuf_t		*lbp,		/* leaf buffer */
+	xfs_dabuf_t		*dbp)		/* data buffer */
+{
+	xfs_dir2_data_off_t	*bestsp;	/* leaf bests table */
+	xfs_dir2_block_t	*block;		/* block structure */
+	xfs_dir2_block_tail_t	*btp;		/* block tail */
+	xfs_inode_t		*dp;		/* incore directory inode */
+	xfs_dir2_data_unused_t	*dup;		/* unused data entry */
+	int			error;		/* error return value */
+	int			from;		/* leaf from index */
+	xfs_dir2_leaf_t		*leaf;		/* leaf structure */
+	xfs_dir2_leaf_entry_t	*lep;		/* leaf entry */
+	xfs_dir2_leaf_tail_t	*ltp;		/* leaf tail structure */
+	xfs_mount_t		*mp;		/* file system mount point */
+	int			needlog;	/* need to log data header */
+	int			needscan;	/* need to scan for bestfree */
+	xfs_dir2_sf_hdr_t	sfh;		/* shortform header */
+	int			size;		/* bytes used */
+	xfs_dir2_data_off_t	*tagp;		/* end of entry (tag) */
+	int			to;		/* block/leaf to index */
+	xfs_trans_t		*tp;		/* transaction pointer */
+
+	xfs_dir2_trace_args_bb("leaf_to_block", args, lbp, dbp);
+	dp = args->dp;
+	tp = args->trans;
+	mp = dp->i_mount;
+	leaf = lbp->data;
+	ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR2_LEAF1_MAGIC);
+	ltp = XFS_DIR2_LEAF_TAIL_P(mp, leaf);
+	/*
+	 * If there are data blocks other than the first one, take this
+	 * opportunity to remove trailing empty data blocks that may have
+	 * been left behind during no-space-reservation operations.
+	 * These will show up in the leaf bests table.
+	 */
+	while (dp->i_d.di_size > mp->m_dirblksize) {
+		bestsp = XFS_DIR2_LEAF_BESTS_P_ARCH(ltp, ARCH_CONVERT);
+		if (INT_GET(bestsp[INT_GET(ltp->bestcount, ARCH_CONVERT) - 1], ARCH_CONVERT) ==
+		    mp->m_dirblksize - (uint)sizeof(block->hdr)) {
+			if ((error =
+			    xfs_dir2_leaf_trim_data(args, lbp,
+				    (xfs_dir2_db_t)(INT_GET(ltp->bestcount, ARCH_CONVERT) - 1))))
+				goto out;
+		} else {
+			error = 0;
+			goto out;
+		}
+	}
+	/*
+	 * Read the data block if we don't already have it, give up if it fails.
+	 */
+	if (dbp == NULL &&
+	    (error = xfs_da_read_buf(tp, dp, mp->m_dirdatablk, -1, &dbp,
+		    XFS_DATA_FORK))) {
+		goto out;
+	}
+	block = dbp->data;
+	ASSERT(INT_GET(block->hdr.magic, ARCH_CONVERT) == XFS_DIR2_DATA_MAGIC);
+	/*
+	 * Size of the "leaf" area in the block.
+	 */
+	size = (uint)sizeof(block->tail) +
+	       (uint)sizeof(*lep) * (INT_GET(leaf->hdr.count, ARCH_CONVERT) - INT_GET(leaf->hdr.stale, ARCH_CONVERT));
+	/*
+	 * Look at the last data entry.
+	 */
+	tagp = (xfs_dir2_data_off_t *)((char *)block + mp->m_dirblksize) - 1;
+	dup = (xfs_dir2_data_unused_t *)((char *)block + INT_GET(*tagp, ARCH_CONVERT));
+	/*
+	 * If it's not free or is too short we can't do it.
+	 */
+	if (INT_GET(dup->freetag, ARCH_CONVERT) != XFS_DIR2_DATA_FREE_TAG || INT_GET(dup->length, ARCH_CONVERT) < size) {
+		error = 0;
+		goto out;
+	}
+	/*
+	 * Start converting it to block form.
+	 */
+	INT_SET(block->hdr.magic, ARCH_CONVERT, XFS_DIR2_BLOCK_MAGIC);
+	needlog = 1;
+	needscan = 0;
+	/*
+	 * Use up the space at the end of the block (blp/btp).
+	 */
+	xfs_dir2_data_use_free(tp, dbp, dup, mp->m_dirblksize - size, size,
+		&needlog, &needscan);
+	/*
+	 * Initialize the block tail.
+	 */
+	btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
+	INT_SET(btp->count, ARCH_CONVERT, INT_GET(leaf->hdr.count, ARCH_CONVERT) - INT_GET(leaf->hdr.stale, ARCH_CONVERT));
+	INT_ZERO(btp->stale, ARCH_CONVERT);
+	xfs_dir2_block_log_tail(tp, dbp);
+	/*
+	 * Initialize the block leaf area.  We compact out stale entries.
+	 */
+	lep = XFS_DIR2_BLOCK_LEAF_P_ARCH(btp, ARCH_CONVERT);
+	for (from = to = 0; from < INT_GET(leaf->hdr.count, ARCH_CONVERT); from++) {
+		if (INT_GET(leaf->ents[from].address, ARCH_CONVERT) == XFS_DIR2_NULL_DATAPTR)
+			continue;
+		lep[to++] = leaf->ents[from];
+	}
+	ASSERT(to == INT_GET(btp->count, ARCH_CONVERT));
+	xfs_dir2_block_log_leaf(tp, dbp, 0, INT_GET(btp->count, ARCH_CONVERT) - 1);
+	/*
+	 * Scan the bestfree if we need it and log the data block header.
+	 */
+	if (needscan)
+		xfs_dir2_data_freescan(mp, (xfs_dir2_data_t *)block, &needlog,
+			NULL);
+	if (needlog)
+		xfs_dir2_data_log_header(tp, dbp);
+	/*
+	 * Pitch the old leaf block.
+	 */
+	error = xfs_da_shrink_inode(args, mp->m_dirleafblk, lbp);
+	lbp = NULL;
+	if (error) {
+		goto out;
+	}
+	/*
+	 * Now see if the resulting block can be shrunken to shortform.
+	 */
+	if ((size = xfs_dir2_block_sfsize(dp, block, &sfh)) >
+	    XFS_IFORK_DSIZE(dp)) {
+		error = 0;
+		goto out;
+	}
+	return xfs_dir2_block_to_sf(args, dbp, size, &sfh);
+out:
+	if (lbp)
+		xfs_da_buf_done(lbp);
+	if (dbp)
+		xfs_da_buf_done(dbp);
+	return error;
+}
+
+/*
+ * Convert the shortform directory to block form.
+ */
+int						/* error */
+xfs_dir2_sf_to_block(
+	xfs_da_args_t		*args)		/* operation arguments */
+{
+	xfs_dir2_db_t		blkno;		/* dir-relative block # (0) */
+	xfs_dir2_block_t	*block;		/* block structure */
+	xfs_dir2_leaf_entry_t	*blp;		/* block leaf entries */
+	xfs_dabuf_t		*bp;		/* block buffer */
+	xfs_dir2_block_tail_t	*btp;		/* block tail pointer */
+	char			*buf;		/* sf buffer */
+	int			buf_len;
+	xfs_dir2_data_entry_t	*dep;		/* data entry pointer */
+	xfs_inode_t		*dp;		/* incore directory inode */
+	int			dummy;		/* trash */
+	xfs_dir2_data_unused_t	*dup;		/* unused entry pointer */
+	int			endoffset;	/* end of data objects */
+	int			error;		/* error return value */
+	int			i;		/* index */
+	xfs_mount_t		*mp;		/* filesystem mount point */
+	int			needlog;	/* need to log block header */
+	int			needscan;	/* need to scan block freespc */
+	int			newoffset;	/* offset from current entry */
+	int			offset;		/* target block offset */
+	xfs_dir2_sf_entry_t	*sfep;		/* sf entry pointer */
+	xfs_dir2_sf_t		*sfp;		/* shortform structure */
+	xfs_dir2_data_off_t	*tagp;		/* end of data entry */
+	xfs_trans_t		*tp;		/* transaction pointer */
+
+	xfs_dir2_trace_args("sf_to_block", args);
+	dp = args->dp;
+	tp = args->trans;
+	mp = dp->i_mount;
+	ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
+	/*
+	 * Bomb out if the shortform directory is way too short.
+	 */
+	if (dp->i_d.di_size < offsetof(xfs_dir2_sf_hdr_t, parent)) {
+		ASSERT(XFS_FORCED_SHUTDOWN(mp));
+		return XFS_ERROR(EIO);
+	}
+	ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
+	ASSERT(dp->i_df.if_u1.if_data != NULL);
+	sfp = (xfs_dir2_sf_t *)dp->i_df.if_u1.if_data;
+	ASSERT(dp->i_d.di_size >= XFS_DIR2_SF_HDR_SIZE(sfp->hdr.i8count));
+	/*
+	 * Copy the directory into the stack buffer.
+	 * Then pitch the incore inode data so we can make extents.
+	 */
+
+	buf_len = dp->i_df.if_bytes;
+	buf = kmem_alloc(dp->i_df.if_bytes, KM_SLEEP);
+
+	memcpy(buf, sfp, dp->i_df.if_bytes);
+	xfs_idata_realloc(dp, -dp->i_df.if_bytes, XFS_DATA_FORK);
+	dp->i_d.di_size = 0;
+	xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
+	/*
+	 * Reset pointer - old sfp is gone.
+	 */
+	sfp = (xfs_dir2_sf_t *)buf;
+	/*
+	 * Add block 0 to the inode.
+	 */
+	error = xfs_dir2_grow_inode(args, XFS_DIR2_DATA_SPACE, &blkno);
+	if (error) {
+		kmem_free(buf, buf_len);
+		return error;
+	}
+	/*
+	 * Initialize the data block.
+	 */
+	error = xfs_dir2_data_init(args, blkno, &bp);
+	if (error) {
+		kmem_free(buf, buf_len);
+		return error;
+	}
+	block = bp->data;
+	INT_SET(block->hdr.magic, ARCH_CONVERT, XFS_DIR2_BLOCK_MAGIC);
+	/*
+	 * Compute size of block "tail" area.
+	 */
+	i = (uint)sizeof(*btp) +
+	    (INT_GET(sfp->hdr.count, ARCH_CONVERT) + 2) * (uint)sizeof(xfs_dir2_leaf_entry_t);
+	/*
+	 * The whole thing is initialized to free by the init routine.
+	 * Say we're using the leaf and tail area.
+	 */
+	dup = (xfs_dir2_data_unused_t *)block->u;
+	needlog = needscan = 0;
+	xfs_dir2_data_use_free(tp, bp, dup, mp->m_dirblksize - i, i, &needlog,
+		&needscan);
+	ASSERT(needscan == 0);
+	/*
+	 * Fill in the tail.
+	 */
+	btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
+	INT_SET(btp->count, ARCH_CONVERT, INT_GET(sfp->hdr.count, ARCH_CONVERT) + 2);	/* ., .. */
+	INT_ZERO(btp->stale, ARCH_CONVERT);
+	blp = XFS_DIR2_BLOCK_LEAF_P_ARCH(btp, ARCH_CONVERT);
+	endoffset = (uint)((char *)blp - (char *)block);
+	/*
+	 * Remove the freespace, we'll manage it.
+	 */
+	xfs_dir2_data_use_free(tp, bp, dup,
+		(xfs_dir2_data_aoff_t)((char *)dup - (char *)block),
+		INT_GET(dup->length, ARCH_CONVERT), &needlog, &needscan);
+	/*
+	 * Create entry for .
+	 */
+	dep = (xfs_dir2_data_entry_t *)
+	      ((char *)block + XFS_DIR2_DATA_DOT_OFFSET);
+	INT_SET(dep->inumber, ARCH_CONVERT, dp->i_ino);
+	dep->namelen = 1;
+	dep->name[0] = '.';
+	tagp = XFS_DIR2_DATA_ENTRY_TAG_P(dep);
+	INT_SET(*tagp, ARCH_CONVERT, (xfs_dir2_data_off_t)((char *)dep - (char *)block));
+	xfs_dir2_data_log_entry(tp, bp, dep);
+	INT_SET(blp[0].hashval, ARCH_CONVERT, xfs_dir_hash_dot);
+	INT_SET(blp[0].address, ARCH_CONVERT, XFS_DIR2_BYTE_TO_DATAPTR(mp, (char *)dep - (char *)block));
+	/*
+	 * Create entry for ..
+	 */
+	dep = (xfs_dir2_data_entry_t *)
+		((char *)block + XFS_DIR2_DATA_DOTDOT_OFFSET);
+	INT_SET(dep->inumber, ARCH_CONVERT, XFS_DIR2_SF_GET_INUMBER_ARCH(sfp, &sfp->hdr.parent, ARCH_CONVERT));
+	dep->namelen = 2;
+	dep->name[0] = dep->name[1] = '.';
+	tagp = XFS_DIR2_DATA_ENTRY_TAG_P(dep);
+	INT_SET(*tagp, ARCH_CONVERT, (xfs_dir2_data_off_t)((char *)dep - (char *)block));
+	xfs_dir2_data_log_entry(tp, bp, dep);
+	INT_SET(blp[1].hashval, ARCH_CONVERT, xfs_dir_hash_dotdot);
+	INT_SET(blp[1].address, ARCH_CONVERT, XFS_DIR2_BYTE_TO_DATAPTR(mp, (char *)dep - (char *)block));
+	offset = XFS_DIR2_DATA_FIRST_OFFSET;
+	/*
+	 * Loop over existing entries, stuff them in.
+	 */
+	if ((i = 0) == INT_GET(sfp->hdr.count, ARCH_CONVERT))
+		sfep = NULL;
+	else
+		sfep = XFS_DIR2_SF_FIRSTENTRY(sfp);
+	/*
+	 * Need to preserve the existing offset values in the sf directory.
+	 * Insert holes (unused entries) where necessary.
+	 */
+	while (offset < endoffset) {
+		/*
+		 * sfep is null when we reach the end of the list.
+		 */
+		if (sfep == NULL)
+			newoffset = endoffset;
+		else
+			newoffset = XFS_DIR2_SF_GET_OFFSET_ARCH(sfep, ARCH_CONVERT);
+		/*
+		 * There should be a hole here, make one.
+		 */
+		if (offset < newoffset) {
+			dup = (xfs_dir2_data_unused_t *)
+			      ((char *)block + offset);
+			INT_SET(dup->freetag, ARCH_CONVERT, XFS_DIR2_DATA_FREE_TAG);
+			INT_SET(dup->length, ARCH_CONVERT, newoffset - offset);
+			INT_SET(*XFS_DIR2_DATA_UNUSED_TAG_P_ARCH(dup, ARCH_CONVERT), ARCH_CONVERT,
+				(xfs_dir2_data_off_t)
+				((char *)dup - (char *)block));
+			xfs_dir2_data_log_unused(tp, bp, dup);
+			(void)xfs_dir2_data_freeinsert((xfs_dir2_data_t *)block,
+				dup, &dummy);
+			offset += INT_GET(dup->length, ARCH_CONVERT);
+			continue;
+		}
+		/*
+		 * Copy a real entry.
+		 */
+		dep = (xfs_dir2_data_entry_t *)((char *)block + newoffset);
+		INT_SET(dep->inumber, ARCH_CONVERT, XFS_DIR2_SF_GET_INUMBER_ARCH(sfp,
+				XFS_DIR2_SF_INUMBERP(sfep), ARCH_CONVERT));
+		dep->namelen = sfep->namelen;
+		memcpy(dep->name, sfep->name, dep->namelen);
+		tagp = XFS_DIR2_DATA_ENTRY_TAG_P(dep);
+		INT_SET(*tagp, ARCH_CONVERT, (xfs_dir2_data_off_t)((char *)dep - (char *)block));
+		xfs_dir2_data_log_entry(tp, bp, dep);
+		INT_SET(blp[2 + i].hashval, ARCH_CONVERT, xfs_da_hashname((char *)sfep->name, sfep->namelen));
+		INT_SET(blp[2 + i].address, ARCH_CONVERT, XFS_DIR2_BYTE_TO_DATAPTR(mp,
+						 (char *)dep - (char *)block));
+		offset = (int)((char *)(tagp + 1) - (char *)block);
+		if (++i == INT_GET(sfp->hdr.count, ARCH_CONVERT))
+			sfep = NULL;
+		else
+			sfep = XFS_DIR2_SF_NEXTENTRY(sfp, sfep);
+	}
+	/* Done with the temporary buffer */
+	kmem_free(buf, buf_len);
+	/*
+	 * Sort the leaf entries by hash value.
+	 */
+	qsort(blp, INT_GET(btp->count, ARCH_CONVERT), sizeof(*blp), xfs_dir2_block_sort);
+	/*
+	 * Log the leaf entry area and tail.
+	 * Already logged the header in data_init, ignore needlog.
+	 */
+	ASSERT(needscan == 0);
+	xfs_dir2_block_log_leaf(tp, bp, 0, INT_GET(btp->count, ARCH_CONVERT) - 1);
+	xfs_dir2_block_log_tail(tp, bp);
+	xfs_dir2_data_check(dp, bp);
+	xfs_da_buf_done(bp);
+	return 0;
+}
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)