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Diffstat (limited to 'fs/xfs/xfs_dir2_leaf.c')
-rw-r--r--fs/xfs/xfs_dir2_leaf.c1896
1 files changed, 1896 insertions, 0 deletions
diff --git a/fs/xfs/xfs_dir2_leaf.c b/fs/xfs/xfs_dir2_leaf.c
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+++ b/fs/xfs/xfs_dir2_leaf.c
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+/*
+ * 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_leaf.c
+ * XFS directory version 2 implementation - single leaf form
+ * see xfs_dir2_leaf.h for data structures.
+ * These directories have multiple XFS_DIR2_DATA blocks and one
+ * XFS_DIR2_LEAF1 block containing the hash table and freespace map.
+ */
+
+#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_ag.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.h"
+#include "xfs_bmap.h"
+#include "xfs_da_btree.h"
+#include "xfs_dir2_data.h"
+#include "xfs_dir2_leaf.h"
+#include "xfs_dir2_block.h"
+#include "xfs_dir2_node.h"
+#include "xfs_dir2_trace.h"
+#include "xfs_error.h"
+#include "xfs_bit.h"
+
+/*
+ * Local function declarations.
+ */
+#ifdef DEBUG
+static void xfs_dir2_leaf_check(xfs_inode_t *dp, xfs_dabuf_t *bp);
+#else
+#define xfs_dir2_leaf_check(dp, bp)
+#endif
+static int xfs_dir2_leaf_lookup_int(xfs_da_args_t *args, xfs_dabuf_t **lbpp,
+ int *indexp, xfs_dabuf_t **dbpp);
+
+/*
+ * Convert a block form directory to a leaf form directory.
+ */
+int /* error */
+xfs_dir2_block_to_leaf(
+ xfs_da_args_t *args, /* operation arguments */
+ xfs_dabuf_t *dbp) /* input block's buffer */
+{
+ xfs_dir2_data_off_t *bestsp; /* leaf's bestsp entries */
+ xfs_dablk_t blkno; /* leaf block's bno */
+ xfs_dir2_block_t *block; /* block structure */
+ xfs_dir2_leaf_entry_t *blp; /* block's leaf entries */
+ xfs_dir2_block_tail_t *btp; /* block's tail */
+ xfs_inode_t *dp; /* incore directory inode */
+ int error; /* error return code */
+ xfs_dabuf_t *lbp; /* leaf block's buffer */
+ xfs_dir2_db_t ldb; /* leaf block's bno */
+ xfs_dir2_leaf_t *leaf; /* leaf structure */
+ xfs_dir2_leaf_tail_t *ltp; /* leaf's tail */
+ xfs_mount_t *mp; /* filesystem mount point */
+ int needlog; /* need to log block header */
+ int needscan; /* need to rescan bestfree */
+ xfs_trans_t *tp; /* transaction pointer */
+
+ xfs_dir2_trace_args_b("block_to_leaf", args, dbp);
+ dp = args->dp;
+ mp = dp->i_mount;
+ tp = args->trans;
+ /*
+ * Add the leaf block to the inode.
+ * This interface will only put blocks in the leaf/node range.
+ * Since that's empty now, we'll get the root (block 0 in range).
+ */
+ if ((error = xfs_da_grow_inode(args, &blkno))) {
+ return error;
+ }
+ ldb = XFS_DIR2_DA_TO_DB(mp, blkno);
+ ASSERT(ldb == XFS_DIR2_LEAF_FIRSTDB(mp));
+ /*
+ * Initialize the leaf block, get a buffer for it.
+ */
+ if ((error = xfs_dir2_leaf_init(args, ldb, &lbp, XFS_DIR2_LEAF1_MAGIC))) {
+ return error;
+ }
+ ASSERT(lbp != NULL);
+ leaf = lbp->data;
+ block = dbp->data;
+ xfs_dir2_data_check(dp, dbp);
+ btp = XFS_DIR2_BLOCK_TAIL_P(mp, block);
+ blp = XFS_DIR2_BLOCK_LEAF_P(btp);
+ /*
+ * Set the counts in the leaf header.
+ */
+ INT_COPY(leaf->hdr.count, btp->count, ARCH_CONVERT); /* INT_: type change */
+ INT_COPY(leaf->hdr.stale, btp->stale, ARCH_CONVERT); /* INT_: type change */
+ /*
+ * Could compact these but I think we always do the conversion
+ * after squeezing out stale entries.
+ */
+ memcpy(leaf->ents, blp, INT_GET(btp->count, ARCH_CONVERT) * sizeof(xfs_dir2_leaf_entry_t));
+ xfs_dir2_leaf_log_ents(tp, lbp, 0, INT_GET(leaf->hdr.count, ARCH_CONVERT) - 1);
+ needscan = 0;
+ needlog = 1;
+ /*
+ * Make the space formerly occupied by the leaf entries and block
+ * tail be free.
+ */
+ xfs_dir2_data_make_free(tp, dbp,
+ (xfs_dir2_data_aoff_t)((char *)blp - (char *)block),
+ (xfs_dir2_data_aoff_t)((char *)block + mp->m_dirblksize -
+ (char *)blp),
+ &needlog, &needscan);
+ /*
+ * Fix up the block header, make it a data block.
+ */
+ INT_SET(block->hdr.magic, ARCH_CONVERT, XFS_DIR2_DATA_MAGIC);
+ if (needscan)
+ xfs_dir2_data_freescan(mp, (xfs_dir2_data_t *)block, &needlog,
+ NULL);
+ /*
+ * Set up leaf tail and bests table.
+ */
+ ltp = XFS_DIR2_LEAF_TAIL_P(mp, leaf);
+ INT_SET(ltp->bestcount, ARCH_CONVERT, 1);
+ bestsp = XFS_DIR2_LEAF_BESTS_P(ltp);
+ INT_COPY(bestsp[0], block->hdr.bestfree[0].length, ARCH_CONVERT);
+ /*
+ * Log the data header and leaf bests table.
+ */
+ if (needlog)
+ xfs_dir2_data_log_header(tp, dbp);
+ xfs_dir2_leaf_check(dp, lbp);
+ xfs_dir2_data_check(dp, dbp);
+ xfs_dir2_leaf_log_bests(tp, lbp, 0, 0);
+ xfs_da_buf_done(lbp);
+ return 0;
+}
+
+/*
+ * Add an entry to a leaf form directory.
+ */
+int /* error */
+xfs_dir2_leaf_addname(
+ xfs_da_args_t *args) /* operation arguments */
+{
+ xfs_dir2_data_off_t *bestsp; /* freespace table in leaf */
+ int compact; /* need to compact leaves */
+ xfs_dir2_data_t *data; /* data block structure */
+ xfs_dabuf_t *dbp; /* data block buffer */
+ xfs_dir2_data_entry_t *dep; /* data block entry */
+ xfs_inode_t *dp; /* incore directory inode */
+ xfs_dir2_data_unused_t *dup; /* data unused entry */
+ int error; /* error return value */
+ int grown; /* allocated new data block */
+ int highstale; /* index of next stale leaf */
+ int i; /* temporary, index */
+ int index; /* leaf table position */
+ xfs_dabuf_t *lbp; /* leaf's buffer */
+ xfs_dir2_leaf_t *leaf; /* leaf structure */
+ int length; /* length of new entry */
+ xfs_dir2_leaf_entry_t *lep; /* leaf entry table pointer */
+ int lfloglow; /* low leaf logging index */
+ int lfloghigh; /* high leaf logging index */
+ int lowstale; /* index of prev stale leaf */
+ xfs_dir2_leaf_tail_t *ltp; /* leaf tail pointer */
+ xfs_mount_t *mp; /* filesystem mount point */
+ int needbytes; /* leaf block bytes needed */
+ int needlog; /* need to log data header */
+ int needscan; /* need to rescan data free */
+ xfs_dir2_data_off_t *tagp; /* end of data entry */
+ xfs_trans_t *tp; /* transaction pointer */
+ xfs_dir2_db_t use_block; /* data block number */
+
+ xfs_dir2_trace_args("leaf_addname", args);
+ dp = args->dp;
+ tp = args->trans;
+ mp = dp->i_mount;
+ /*
+ * Read the leaf block.
+ */
+ error = xfs_da_read_buf(tp, dp, mp->m_dirleafblk, -1, &lbp,
+ XFS_DATA_FORK);
+ if (error) {
+ return error;
+ }
+ ASSERT(lbp != NULL);
+ /*
+ * Look up the entry by hash value and name.
+ * We know it's not there, our caller has already done a lookup.
+ * So the index is of the entry to insert in front of.
+ * But if there are dup hash values the index is of the first of those.
+ */
+ index = xfs_dir2_leaf_search_hash(args, lbp);
+ leaf = lbp->data;
+ ltp = XFS_DIR2_LEAF_TAIL_P(mp, leaf);
+ bestsp = XFS_DIR2_LEAF_BESTS_P(ltp);
+ length = XFS_DIR2_DATA_ENTSIZE(args->namelen);
+ /*
+ * See if there are any entries with the same hash value
+ * and space in their block for the new entry.
+ * This is good because it puts multiple same-hash value entries
+ * in a data block, improving the lookup of those entries.
+ */
+ for (use_block = -1, lep = &leaf->ents[index];
+ index < INT_GET(leaf->hdr.count, ARCH_CONVERT) && INT_GET(lep->hashval, ARCH_CONVERT) == args->hashval;
+ index++, lep++) {
+ if (INT_GET(lep->address, ARCH_CONVERT) == XFS_DIR2_NULL_DATAPTR)
+ continue;
+ i = XFS_DIR2_DATAPTR_TO_DB(mp, INT_GET(lep->address, ARCH_CONVERT));
+ ASSERT(i < INT_GET(ltp->bestcount, ARCH_CONVERT));
+ ASSERT(INT_GET(bestsp[i], ARCH_CONVERT) != NULLDATAOFF);
+ if (INT_GET(bestsp[i], ARCH_CONVERT) >= length) {
+ use_block = i;
+ break;
+ }
+ }
+ /*
+ * Didn't find a block yet, linear search all the data blocks.
+ */
+ if (use_block == -1) {
+ for (i = 0; i < INT_GET(ltp->bestcount, ARCH_CONVERT); i++) {
+ /*
+ * Remember a block we see that's missing.
+ */
+ if (INT_GET(bestsp[i], ARCH_CONVERT) == NULLDATAOFF && use_block == -1)
+ use_block = i;
+ else if (INT_GET(bestsp[i], ARCH_CONVERT) >= length) {
+ use_block = i;
+ break;
+ }
+ }
+ }
+ /*
+ * How many bytes do we need in the leaf block?
+ */
+ needbytes =
+ (leaf->hdr.stale ? 0 : (uint)sizeof(leaf->ents[0])) +
+ (use_block != -1 ? 0 : (uint)sizeof(leaf->bests[0]));
+ /*
+ * Now kill use_block if it refers to a missing block, so we
+ * can use it as an indication of allocation needed.
+ */
+ if (use_block != -1 && INT_GET(bestsp[use_block], ARCH_CONVERT) == NULLDATAOFF)
+ use_block = -1;
+ /*
+ * If we don't have enough free bytes but we can make enough
+ * by compacting out stale entries, we'll do that.
+ */
+ if ((char *)bestsp - (char *)&leaf->ents[INT_GET(leaf->hdr.count, ARCH_CONVERT)] < needbytes &&
+ INT_GET(leaf->hdr.stale, ARCH_CONVERT) > 1) {
+ compact = 1;
+ }
+ /*
+ * Otherwise if we don't have enough free bytes we need to
+ * convert to node form.
+ */
+ else if ((char *)bestsp - (char *)&leaf->ents[INT_GET(leaf->hdr.count, ARCH_CONVERT)] <
+ needbytes) {
+ /*
+ * Just checking or no space reservation, give up.
+ */
+ if (args->justcheck || args->total == 0) {
+ xfs_da_brelse(tp, lbp);
+ return XFS_ERROR(ENOSPC);
+ }
+ /*
+ * Convert to node form.
+ */
+ error = xfs_dir2_leaf_to_node(args, lbp);
+ xfs_da_buf_done(lbp);
+ if (error)
+ return error;
+ /*
+ * Then add the new entry.
+ */
+ return xfs_dir2_node_addname(args);
+ }
+ /*
+ * Otherwise it will fit without compaction.
+ */
+ else
+ compact = 0;
+ /*
+ * If just checking, then it will fit unless we needed to allocate
+ * a new data block.
+ */
+ if (args->justcheck) {
+ xfs_da_brelse(tp, lbp);
+ return use_block == -1 ? XFS_ERROR(ENOSPC) : 0;
+ }
+ /*
+ * If no allocations are allowed, return now before we've
+ * changed anything.
+ */
+ if (args->total == 0 && use_block == -1) {
+ xfs_da_brelse(tp, lbp);
+ return XFS_ERROR(ENOSPC);
+ }
+ /*
+ * Need to compact the leaf entries, removing stale ones.
+ * Leave one stale entry behind - the one closest to our
+ * insertion index - and we'll shift that one to our insertion
+ * point later.
+ */
+ if (compact) {
+ xfs_dir2_leaf_compact_x1(lbp, &index, &lowstale, &highstale,
+ &lfloglow, &lfloghigh);
+ }
+ /*
+ * There are stale entries, so we'll need log-low and log-high
+ * impossibly bad values later.
+ */
+ else if (INT_GET(leaf->hdr.stale, ARCH_CONVERT)) {
+ lfloglow = INT_GET(leaf->hdr.count, ARCH_CONVERT);
+ lfloghigh = -1;
+ }
+ /*
+ * If there was no data block space found, we need to allocate
+ * a new one.
+ */
+ if (use_block == -1) {
+ /*
+ * Add the new data block.
+ */
+ if ((error = xfs_dir2_grow_inode(args, XFS_DIR2_DATA_SPACE,
+ &use_block))) {
+ xfs_da_brelse(tp, lbp);
+ return error;
+ }
+ /*
+ * Initialize the block.
+ */
+ if ((error = xfs_dir2_data_init(args, use_block, &dbp))) {
+ xfs_da_brelse(tp, lbp);
+ return error;
+ }
+ /*
+ * If we're adding a new data block on the end we need to
+ * extend the bests table. Copy it up one entry.
+ */
+ if (use_block >= INT_GET(ltp->bestcount, ARCH_CONVERT)) {
+ bestsp--;
+ memmove(&bestsp[0], &bestsp[1],
+ INT_GET(ltp->bestcount, ARCH_CONVERT) * sizeof(bestsp[0]));
+ INT_MOD(ltp->bestcount, ARCH_CONVERT, +1);
+ xfs_dir2_leaf_log_tail(tp, lbp);
+ xfs_dir2_leaf_log_bests(tp, lbp, 0, INT_GET(ltp->bestcount, ARCH_CONVERT) - 1);
+ }
+ /*
+ * If we're filling in a previously empty block just log it.
+ */
+ else
+ xfs_dir2_leaf_log_bests(tp, lbp, use_block, use_block);
+ data = dbp->data;
+ INT_COPY(bestsp[use_block], data->hdr.bestfree[0].length, ARCH_CONVERT);
+ grown = 1;
+ }
+ /*
+ * Already had space in some data block.
+ * Just read that one in.
+ */
+ else {
+ if ((error =
+ xfs_da_read_buf(tp, dp, XFS_DIR2_DB_TO_DA(mp, use_block),
+ -1, &dbp, XFS_DATA_FORK))) {
+ xfs_da_brelse(tp, lbp);
+ return error;
+ }
+ data = dbp->data;
+ grown = 0;
+ }
+ xfs_dir2_data_check(dp, dbp);
+ /*
+ * Point to the biggest freespace in our data block.
+ */
+ dup = (xfs_dir2_data_unused_t *)
+ ((char *)data + INT_GET(data->hdr.bestfree[0].offset, ARCH_CONVERT));
+ ASSERT(INT_GET(dup->length, ARCH_CONVERT) >= length);
+ needscan = needlog = 0;
+ /*
+ * Mark the initial part of our freespace in use for the new entry.
+ */
+ xfs_dir2_data_use_free(tp, dbp, dup,
+ (xfs_dir2_data_aoff_t)((char *)dup - (char *)data), length,
+ &needlog, &needscan);
+ /*
+ * Initialize our new entry (at last).
+ */
+ dep = (xfs_dir2_data_entry_t *)dup;
+ INT_SET(dep->inumber, ARCH_CONVERT, args->inumber);
+ dep->namelen = args->namelen;
+ memcpy(dep->name, args->name, dep->namelen);
+ tagp = XFS_DIR2_DATA_ENTRY_TAG_P(dep);
+ INT_SET(*tagp, ARCH_CONVERT, (xfs_dir2_data_off_t)((char *)dep - (char *)data));
+ /*
+ * Need to scan fix up the bestfree table.
+ */
+ if (needscan)
+ xfs_dir2_data_freescan(mp, data, &needlog, NULL);
+ /*
+ * Need to log the data block's header.
+ */
+ if (needlog)
+ xfs_dir2_data_log_header(tp, dbp);
+ xfs_dir2_data_log_entry(tp, dbp, dep);
+ /*
+ * If the bests table needs to be changed, do it.
+ * Log the change unless we've already done that.
+ */
+ if (INT_GET(bestsp[use_block], ARCH_CONVERT) != INT_GET(data->hdr.bestfree[0].length, ARCH_CONVERT)) {
+ INT_COPY(bestsp[use_block], data->hdr.bestfree[0].length, ARCH_CONVERT);
+ if (!grown)
+ xfs_dir2_leaf_log_bests(tp, lbp, use_block, use_block);
+ }
+ /*
+ * Now we need to make room to insert the leaf entry.
+ * If there are no stale entries, we just insert a hole at index.
+ */
+ if (!leaf->hdr.stale) {
+ /*
+ * lep is still good as the index leaf entry.
+ */
+ if (index < INT_GET(leaf->hdr.count, ARCH_CONVERT))
+ memmove(lep + 1, lep,
+ (INT_GET(leaf->hdr.count, ARCH_CONVERT) - index) * sizeof(*lep));
+ /*
+ * Record low and high logging indices for the leaf.
+ */
+ lfloglow = index;
+ lfloghigh = INT_GET(leaf->hdr.count, ARCH_CONVERT);
+ INT_MOD(leaf->hdr.count, ARCH_CONVERT, +1);
+ }
+ /*
+ * There are stale entries.
+ * We will use one of them for the new entry.
+ * It's probably not at the right location, so we'll have to
+ * shift some up or down first.
+ */
+ else {
+ /*
+ * If we didn't compact before, we need to find the nearest
+ * stale entries before and after our insertion point.
+ */
+ if (compact == 0) {
+ /*
+ * Find the first stale entry before the insertion
+ * point, if any.
+ */
+ for (lowstale = index - 1;
+ lowstale >= 0 &&
+ INT_GET(leaf->ents[lowstale].address, ARCH_CONVERT) !=
+ XFS_DIR2_NULL_DATAPTR;
+ lowstale--)
+ continue;
+ /*
+ * Find the next stale entry at or after the insertion
+ * point, if any. Stop if we go so far that the
+ * lowstale entry would be better.
+ */
+ for (highstale = index;
+ highstale < INT_GET(leaf->hdr.count, ARCH_CONVERT) &&
+ INT_GET(leaf->ents[highstale].address, ARCH_CONVERT) !=
+ XFS_DIR2_NULL_DATAPTR &&
+ (lowstale < 0 ||
+ index - lowstale - 1 >= highstale - index);
+ highstale++)
+ continue;
+ }
+ /*
+ * If the low one is better, use it.
+ */
+ if (lowstale >= 0 &&
+ (highstale == INT_GET(leaf->hdr.count, ARCH_CONVERT) ||
+ index - lowstale - 1 < highstale - index)) {
+ ASSERT(index - lowstale - 1 >= 0);
+ ASSERT(INT_GET(leaf->ents[lowstale].address, ARCH_CONVERT) ==
+ XFS_DIR2_NULL_DATAPTR);
+ /*
+ * Copy entries up to cover the stale entry
+ * and make room for the new entry.
+ */
+ if (index - lowstale - 1 > 0)
+ memmove(&leaf->ents[lowstale],
+ &leaf->ents[lowstale + 1],
+ (index - lowstale - 1) * sizeof(*lep));
+ lep = &leaf->ents[index - 1];
+ lfloglow = MIN(lowstale, lfloglow);
+ lfloghigh = MAX(index - 1, lfloghigh);
+ }
+ /*
+ * The high one is better, so use that one.
+ */
+ else {
+ ASSERT(highstale - index >= 0);
+ ASSERT(INT_GET(leaf->ents[highstale].address, ARCH_CONVERT) ==
+ XFS_DIR2_NULL_DATAPTR);
+ /*
+ * Copy entries down to copver the stale entry
+ * and make room for the new entry.
+ */
+ if (highstale - index > 0)
+ memmove(&leaf->ents[index + 1],
+ &leaf->ents[index],
+ (highstale - index) * sizeof(*lep));
+ lep = &leaf->ents[index];
+ lfloglow = MIN(index, lfloglow);
+ lfloghigh = MAX(highstale, lfloghigh);
+ }
+ INT_MOD(leaf->hdr.stale, ARCH_CONVERT, -1);
+ }
+ /*
+ * Fill in the new leaf entry.
+ */
+ INT_SET(lep->hashval, ARCH_CONVERT, args->hashval);
+ INT_SET(lep->address, ARCH_CONVERT, XFS_DIR2_DB_OFF_TO_DATAPTR(mp, use_block, INT_GET(*tagp, ARCH_CONVERT)));
+ /*
+ * Log the leaf fields and give up the buffers.
+ */
+ xfs_dir2_leaf_log_header(tp, lbp);
+ xfs_dir2_leaf_log_ents(tp, lbp, lfloglow, lfloghigh);
+ xfs_dir2_leaf_check(dp, lbp);
+ xfs_da_buf_done(lbp);
+ xfs_dir2_data_check(dp, dbp);
+ xfs_da_buf_done(dbp);
+ return 0;
+}
+
+#ifdef DEBUG
+/*
+ * Check the internal consistency of a leaf1 block.
+ * Pop an assert if something is wrong.
+ */
+void
+xfs_dir2_leaf_check(
+ xfs_inode_t *dp, /* incore directory inode */
+ xfs_dabuf_t *bp) /* leaf's buffer */
+{
+ int i; /* leaf index */
+ xfs_dir2_leaf_t *leaf; /* leaf structure */
+ xfs_dir2_leaf_tail_t *ltp; /* leaf tail pointer */
+ xfs_mount_t *mp; /* filesystem mount point */
+ int stale; /* count of stale leaves */
+
+ leaf = bp->data;
+ mp = dp->i_mount;
+ ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR2_LEAF1_MAGIC);
+ /*
+ * This value is not restrictive enough.
+ * Should factor in the size of the bests table as well.
+ * We can deduce a value for that from di_size.
+ */
+ ASSERT(INT_GET(leaf->hdr.count, ARCH_CONVERT) <= XFS_DIR2_MAX_LEAF_ENTS(mp));
+ ltp = XFS_DIR2_LEAF_TAIL_P(mp, leaf);
+ /*
+ * Leaves and bests don't overlap.
+ */
+ ASSERT((char *)&leaf->ents[INT_GET(leaf->hdr.count, ARCH_CONVERT)] <=
+ (char *)XFS_DIR2_LEAF_BESTS_P(ltp));
+ /*
+ * Check hash value order, count stale entries.
+ */
+ for (i = stale = 0; i < INT_GET(leaf->hdr.count, ARCH_CONVERT); i++) {
+ if (i + 1 < INT_GET(leaf->hdr.count, ARCH_CONVERT))
+ ASSERT(INT_GET(leaf->ents[i].hashval, ARCH_CONVERT) <=
+ INT_GET(leaf->ents[i + 1].hashval, ARCH_CONVERT));
+ if (INT_GET(leaf->ents[i].address, ARCH_CONVERT) == XFS_DIR2_NULL_DATAPTR)
+ stale++;
+ }
+ ASSERT(INT_GET(leaf->hdr.stale, ARCH_CONVERT) == stale);
+}
+#endif /* DEBUG */
+
+/*
+ * Compact out any stale entries in the leaf.
+ * Log the header and changed leaf entries, if any.
+ */
+void
+xfs_dir2_leaf_compact(
+ xfs_da_args_t *args, /* operation arguments */
+ xfs_dabuf_t *bp) /* leaf buffer */
+{
+ int from; /* source leaf index */
+ xfs_dir2_leaf_t *leaf; /* leaf structure */
+ int loglow; /* first leaf entry to log */
+ int to; /* target leaf index */
+
+ leaf = bp->data;
+ if (!leaf->hdr.stale) {
+ return;
+ }
+ /*
+ * Compress out the stale entries in place.
+ */
+ for (from = to = 0, loglow = -1; from < INT_GET(leaf->hdr.count, ARCH_CONVERT); from++) {
+ if (INT_GET(leaf->ents[from].address, ARCH_CONVERT) == XFS_DIR2_NULL_DATAPTR)
+ continue;
+ /*
+ * Only actually copy the entries that are different.
+ */
+ if (from > to) {
+ if (loglow == -1)
+ loglow = to;
+ leaf->ents[to] = leaf->ents[from];
+ }
+ to++;
+ }
+ /*
+ * Update and log the header, log the leaf entries.
+ */
+ ASSERT(INT_GET(leaf->hdr.stale, ARCH_CONVERT) == from - to);
+ INT_MOD(leaf->hdr.count, ARCH_CONVERT, -(INT_GET(leaf->hdr.stale, ARCH_CONVERT)));
+ leaf->hdr.stale = 0;
+ xfs_dir2_leaf_log_header(args->trans, bp);
+ if (loglow != -1)
+ xfs_dir2_leaf_log_ents(args->trans, bp, loglow, to - 1);
+}
+
+/*
+ * Compact the leaf entries, removing stale ones.
+ * Leave one stale entry behind - the one closest to our
+ * insertion index - and the caller will shift that one to our insertion
+ * point later.
+ * Return new insertion index, where the remaining stale entry is,
+ * and leaf logging indices.
+ */
+void
+xfs_dir2_leaf_compact_x1(
+ xfs_dabuf_t *bp, /* leaf buffer */
+ int *indexp, /* insertion index */
+ int *lowstalep, /* out: stale entry before us */
+ int *highstalep, /* out: stale entry after us */
+ int *lowlogp, /* out: low log index */
+ int *highlogp) /* out: high log index */
+{
+ int from; /* source copy index */
+ int highstale; /* stale entry at/after index */
+ int index; /* insertion index */
+ int keepstale; /* source index of kept stale */
+ xfs_dir2_leaf_t *leaf; /* leaf structure */
+ int lowstale; /* stale entry before index */
+ int newindex=0; /* new insertion index */
+ int to; /* destination copy index */
+
+ leaf = bp->data;
+ ASSERT(INT_GET(leaf->hdr.stale, ARCH_CONVERT) > 1);
+ index = *indexp;
+ /*
+ * Find the first stale entry before our index, if any.
+ */
+ for (lowstale = index - 1;
+ lowstale >= 0 &&
+ INT_GET(leaf->ents[lowstale].address, ARCH_CONVERT) != XFS_DIR2_NULL_DATAPTR;
+ lowstale--)
+ continue;
+ /*
+ * Find the first stale entry at or after our index, if any.
+ * Stop if the answer would be worse than lowstale.
+ */
+ for (highstale = index;
+ highstale < INT_GET(leaf->hdr.count, ARCH_CONVERT) &&
+ INT_GET(leaf->ents[highstale].address, ARCH_CONVERT) != XFS_DIR2_NULL_DATAPTR &&
+ (lowstale < 0 || index - lowstale > highstale - index);
+ highstale++)
+ continue;
+ /*
+ * Pick the better of lowstale and highstale.
+ */
+ if (lowstale >= 0 &&
+ (highstale == INT_GET(leaf->hdr.count, ARCH_CONVERT) ||
+ index - lowstale <= highstale - index))
+ keepstale = lowstale;
+ else
+ keepstale = highstale;
+ /*
+ * Copy the entries in place, removing all the stale entries
+ * except keepstale.
+ */
+ for (from = to = 0; from < INT_GET(leaf->hdr.count, ARCH_CONVERT); from++) {
+ /*
+ * Notice the new value of index.
+ */
+ if (index == from)
+ newindex = to;
+ if (from != keepstale &&
+ INT_GET(leaf->ents[from].address, ARCH_CONVERT) == XFS_DIR2_NULL_DATAPTR) {
+ if (from == to)
+ *lowlogp = to;
+ continue;
+ }
+ /*
+ * Record the new keepstale value for the insertion.
+ */
+ if (from == keepstale)
+ lowstale = highstale = to;
+ /*
+ * Copy only the entries that have moved.
+ */
+ if (from > to)
+ leaf->ents[to] = leaf->ents[from];
+ to++;
+ }
+ ASSERT(from > to);
+ /*
+ * If the insertion point was past the last entry,
+ * set the new insertion point accordingly.
+ */
+ if (index == from)
+ newindex = to;
+ *indexp = newindex;
+ /*
+ * Adjust the leaf header values.
+ */
+ INT_MOD(leaf->hdr.count, ARCH_CONVERT, -(from - to));
+ INT_SET(leaf->hdr.stale, ARCH_CONVERT, 1);
+ /*
+ * Remember the low/high stale value only in the "right"
+ * direction.
+ */
+ if (lowstale >= newindex)
+ lowstale = -1;
+ else
+ highstale = INT_GET(leaf->hdr.count, ARCH_CONVERT);
+ *highlogp = INT_GET(leaf->hdr.count, ARCH_CONVERT) - 1;
+ *lowstalep = lowstale;
+ *highstalep = highstale;
+}
+
+/*
+ * Getdents (readdir) for leaf and node directories.
+ * This reads the data blocks only, so is the same for both forms.
+ */
+int /* error */
+xfs_dir2_leaf_getdents(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_inode_t *dp, /* incore directory inode */
+ uio_t *uio, /* I/O control & vectors */
+ int *eofp, /* out: reached end of dir */
+ xfs_dirent_t *dbp, /* caller's buffer */
+ xfs_dir2_put_t put) /* ABI formatting routine */
+{
+ xfs_dabuf_t *bp; /* data block buffer */
+ int byteoff; /* offset in current block */
+ xfs_dir2_db_t curdb; /* db for current block */
+ xfs_dir2_off_t curoff; /* current overall offset */
+ xfs_dir2_data_t *data; /* data block structure */
+ xfs_dir2_data_entry_t *dep; /* data entry */
+ xfs_dir2_data_unused_t *dup; /* unused entry */
+ int eof; /* reached end of directory */
+ int error=0; /* error return value */
+ int i; /* temporary loop index */
+ int j; /* temporary loop index */
+ int length; /* temporary length value */
+ xfs_bmbt_irec_t *map; /* map vector for blocks */
+ xfs_extlen_t map_blocks; /* number of fsbs in map */
+ xfs_dablk_t map_off; /* last mapped file offset */
+ int map_size; /* total entries in *map */
+ int map_valid; /* valid entries in *map */
+ xfs_mount_t *mp; /* filesystem mount point */
+ xfs_dir2_off_t newoff; /* new curoff after new blk */
+ int nmap; /* mappings to ask xfs_bmapi */
+ xfs_dir2_put_args_t p; /* formatting arg bundle */
+ char *ptr=NULL; /* pointer to current data */
+ int ra_current; /* number of read-ahead blks */
+ int ra_index; /* *map index for read-ahead */
+ int ra_offset; /* map entry offset for ra */
+ int ra_want; /* readahead count wanted */
+
+ /*
+ * If the offset is at or past the largest allowed value,
+ * give up right away, return eof.
+ */
+ if (uio->uio_offset >= XFS_DIR2_MAX_DATAPTR) {
+ *eofp = 1;
+ return 0;
+ }
+ mp = dp->i_mount;
+ /*
+ * Setup formatting arguments.
+ */
+ p.dbp = dbp;
+ p.put = put;
+ p.uio = uio;
+ /*
+ * Set up to bmap a number of blocks based on the caller's
+ * buffer size, the directory block size, and the filesystem
+ * block size.
+ */
+ map_size =
+ howmany(uio->uio_resid + mp->m_dirblksize,
+ mp->m_sb.sb_blocksize);
+ map = kmem_alloc(map_size * sizeof(*map), KM_SLEEP);
+ map_valid = ra_index = ra_offset = ra_current = map_blocks = 0;
+ bp = NULL;
+ eof = 1;
+ /*
+ * Inside the loop we keep the main offset value as a byte offset
+ * in the directory file.
+ */
+ curoff = XFS_DIR2_DATAPTR_TO_BYTE(mp, uio->uio_offset);
+ /*
+ * Force this conversion through db so we truncate the offset
+ * down to get the start of the data block.
+ */
+ map_off = XFS_DIR2_DB_TO_DA(mp, XFS_DIR2_BYTE_TO_DB(mp, curoff));
+ /*
+ * Loop over directory entries until we reach the end offset.
+ * Get more blocks and readahead as necessary.
+ */
+ while (curoff < XFS_DIR2_LEAF_OFFSET) {
+ /*
+ * If we have no buffer, or we're off the end of the
+ * current buffer, need to get another one.
+ */
+ if (!bp || ptr >= (char *)bp->data + mp->m_dirblksize) {
+ /*
+ * If we have a buffer, we need to release it and
+ * take it out of the mapping.
+ */
+ if (bp) {
+ xfs_da_brelse(tp, bp);
+ bp = NULL;
+ map_blocks -= mp->m_dirblkfsbs;
+ /*
+ * Loop to get rid of the extents for the
+ * directory block.
+ */
+ for (i = mp->m_dirblkfsbs; i > 0; ) {
+ j = MIN((int)map->br_blockcount, i);
+ map->br_blockcount -= j;
+ map->br_startblock += j;
+ map->br_startoff += j;
+ /*
+ * If mapping is done, pitch it from
+ * the table.
+ */
+ if (!map->br_blockcount && --map_valid)
+ memmove(&map[0], &map[1],
+ sizeof(map[0]) *
+ map_valid);
+ i -= j;
+ }
+ }
+ /*
+ * Recalculate the readahead blocks wanted.
+ */
+ ra_want = howmany(uio->uio_resid + mp->m_dirblksize,
+ mp->m_sb.sb_blocksize) - 1;
+ /*
+ * If we don't have as many as we want, and we haven't
+ * run out of data blocks, get some more mappings.
+ */
+ if (1 + ra_want > map_blocks &&
+ map_off <
+ XFS_DIR2_BYTE_TO_DA(mp, XFS_DIR2_LEAF_OFFSET)) {
+ /*
+ * Get more bmaps, fill in after the ones
+ * we already have in the table.
+ */
+ nmap = map_size - map_valid;
+ error = xfs_bmapi(tp, dp,
+ map_off,
+ XFS_DIR2_BYTE_TO_DA(mp,
+ XFS_DIR2_LEAF_OFFSET) - map_off,
+ XFS_BMAPI_METADATA, NULL, 0,
+ &map[map_valid], &nmap, NULL);
+ /*
+ * Don't know if we should ignore this or
+ * try to return an error.
+ * The trouble with returning errors
+ * is that readdir will just stop without
+ * actually passing the error through.
+ */
+ if (error)
+ break; /* XXX */
+ /*
+ * If we got all the mappings we asked for,
+ * set the final map offset based on the
+ * last bmap value received.
+ * Otherwise, we've reached the end.
+ */
+ if (nmap == map_size - map_valid)
+ map_off =
+ map[map_valid + nmap - 1].br_startoff +
+ map[map_valid + nmap - 1].br_blockcount;
+ else
+ map_off =
+ XFS_DIR2_BYTE_TO_DA(mp,
+ XFS_DIR2_LEAF_OFFSET);
+ /*
+ * Look for holes in the mapping, and
+ * eliminate them. Count up the valid blocks.
+ */
+ for (i = map_valid; i < map_valid + nmap; ) {
+ if (map[i].br_startblock ==
+ HOLESTARTBLOCK) {
+ nmap--;
+ length = map_valid + nmap - i;
+ if (length)
+ memmove(&map[i],
+ &map[i + 1],
+ sizeof(map[i]) *
+ length);
+ } else {
+ map_blocks +=
+ map[i].br_blockcount;
+ i++;
+ }
+ }
+ map_valid += nmap;
+ }
+ /*
+ * No valid mappings, so no more data blocks.
+ */
+ if (!map_valid) {
+ curoff = XFS_DIR2_DA_TO_BYTE(mp, map_off);
+ break;
+ }
+ /*
+ * Read the directory block starting at the first
+ * mapping.
+ */
+ curdb = XFS_DIR2_DA_TO_DB(mp, map->br_startoff);
+ error = xfs_da_read_buf(tp, dp, map->br_startoff,
+ map->br_blockcount >= mp->m_dirblkfsbs ?
+ XFS_FSB_TO_DADDR(mp, map->br_startblock) :
+ -1,
+ &bp, XFS_DATA_FORK);
+ /*
+ * Should just skip over the data block instead
+ * of giving up.
+ */
+ if (error)
+ break; /* XXX */
+ /*
+ * Adjust the current amount of read-ahead: we just
+ * read a block that was previously ra.
+ */
+ if (ra_current)
+ ra_current -= mp->m_dirblkfsbs;
+ /*
+ * Do we need more readahead?
+ */
+ for (ra_index = ra_offset = i = 0;
+ ra_want > ra_current && i < map_blocks;
+ i += mp->m_dirblkfsbs) {
+ ASSERT(ra_index < map_valid);
+ /*
+ * Read-ahead a contiguous directory block.
+ */
+ if (i > ra_current &&
+ map[ra_index].br_blockcount >=
+ mp->m_dirblkfsbs) {
+ xfs_baread(mp->m_ddev_targp,
+ XFS_FSB_TO_DADDR(mp,
+ map[ra_index].br_startblock +
+ ra_offset),
+ (int)BTOBB(mp->m_dirblksize));
+ ra_current = i;
+ }
+ /*
+ * Read-ahead a non-contiguous directory block.
+ * This doesn't use our mapping, but this
+ * is a very rare case.
+ */
+ else if (i > ra_current) {
+ (void)xfs_da_reada_buf(tp, dp,
+ map[ra_index].br_startoff +
+ ra_offset, XFS_DATA_FORK);
+ ra_current = i;
+ }
+ /*
+ * Advance offset through the mapping table.
+ */
+ for (j = 0; j < mp->m_dirblkfsbs; j++) {
+ /*
+ * The rest of this extent but not
+ * more than a dir block.
+ */
+ length = MIN(mp->m_dirblkfsbs,
+ (int)(map[ra_index].br_blockcount -
+ ra_offset));
+ j += length;
+ ra_offset += length;
+ /*
+ * Advance to the next mapping if
+ * this one is used up.
+ */
+ if (ra_offset ==
+ map[ra_index].br_blockcount) {
+ ra_offset = 0;
+ ra_index++;
+ }
+ }
+ }
+ /*
+ * Having done a read, we need to set a new offset.
+ */
+ newoff = XFS_DIR2_DB_OFF_TO_BYTE(mp, curdb, 0);
+ /*
+ * Start of the current block.
+ */
+ if (curoff < newoff)
+ curoff = newoff;
+ /*
+ * Make sure we're in the right block.
+ */
+ else if (curoff > newoff)
+ ASSERT(XFS_DIR2_BYTE_TO_DB(mp, curoff) ==
+ curdb);
+ data = bp->data;
+ xfs_dir2_data_check(dp, bp);
+ /*
+ * Find our position in the block.
+ */
+ ptr = (char *)&data->u;
+ byteoff = XFS_DIR2_BYTE_TO_OFF(mp, curoff);
+ /*
+ * Skip past the header.
+ */
+ if (byteoff == 0)
+ curoff += (uint)sizeof(data->hdr);
+ /*
+ * Skip past entries until we reach our offset.
+ */
+ else {
+ while ((char *)ptr - (char *)data < byteoff) {
+ dup = (xfs_dir2_data_unused_t *)ptr;
+
+ if (INT_GET(dup->freetag, ARCH_CONVERT)
+ == XFS_DIR2_DATA_FREE_TAG) {
+
+ length = INT_GET(dup->length,
+ ARCH_CONVERT);
+ ptr += length;
+ continue;
+ }
+ dep = (xfs_dir2_data_entry_t *)ptr;
+ length =
+ XFS_DIR2_DATA_ENTSIZE(dep->namelen);
+ ptr += length;
+ }
+ /*
+ * Now set our real offset.
+ */
+ curoff =
+ XFS_DIR2_DB_OFF_TO_BYTE(mp,
+ XFS_DIR2_BYTE_TO_DB(mp, curoff),
+ (char *)ptr - (char *)data);
+ if (ptr >= (char *)data + mp->m_dirblksize) {
+ continue;
+ }
+ }
+ }
+ /*
+ * We have a pointer to an entry.
+ * Is it a live one?
+ */
+ dup = (xfs_dir2_data_unused_t *)ptr;
+ /*
+ * No, it's unused, skip over it.
+ */
+ if (INT_GET(dup->freetag, ARCH_CONVERT)
+ == XFS_DIR2_DATA_FREE_TAG) {
+ length = INT_GET(dup->length, ARCH_CONVERT);
+ ptr += length;
+ curoff += length;
+ continue;
+ }
+
+ /*
+ * Copy the entry into the putargs, and try formatting it.
+ */
+ dep = (xfs_dir2_data_entry_t *)ptr;
+
+ p.namelen = dep->namelen;
+
+ length = XFS_DIR2_DATA_ENTSIZE(p.namelen);
+
+ p.cook = XFS_DIR2_BYTE_TO_DATAPTR(mp, curoff + length);
+
+ p.ino = INT_GET(dep->inumber, ARCH_CONVERT);
+#if XFS_BIG_INUMS
+ p.ino += mp->m_inoadd;
+#endif
+ p.name = (char *)dep->name;
+
+ error = p.put(&p);
+
+ /*
+ * Won't fit. Return to caller.
+ */
+ if (!p.done) {
+ eof = 0;
+ break;
+ }
+ /*
+ * Advance to next entry in the block.
+ */
+ ptr += length;
+ curoff += length;
+ }
+
+ /*
+ * All done. Set output offset value to current offset.
+ */
+ *eofp = eof;
+ if (curoff > XFS_DIR2_DATAPTR_TO_BYTE(mp, XFS_DIR2_MAX_DATAPTR))
+ uio->uio_offset = XFS_DIR2_MAX_DATAPTR;
+ else
+ uio->uio_offset = XFS_DIR2_BYTE_TO_DATAPTR(mp, curoff);
+ kmem_free(map, map_size * sizeof(*map));
+ if (bp)
+ xfs_da_brelse(tp, bp);
+ return error;
+}
+
+/*
+ * Initialize a new leaf block, leaf1 or leafn magic accepted.
+ */
+int
+xfs_dir2_leaf_init(
+ xfs_da_args_t *args, /* operation arguments */
+ xfs_dir2_db_t bno, /* directory block number */
+ xfs_dabuf_t **bpp, /* out: leaf buffer */
+ int magic) /* magic number for block */
+{
+ xfs_dabuf_t *bp; /* leaf buffer */
+ xfs_inode_t *dp; /* incore directory inode */
+ int error; /* error return code */
+ xfs_dir2_leaf_t *leaf; /* leaf structure */
+ xfs_dir2_leaf_tail_t *ltp; /* leaf tail structure */
+ xfs_mount_t *mp; /* filesystem mount point */
+ xfs_trans_t *tp; /* transaction pointer */
+
+ dp = args->dp;
+ ASSERT(dp != NULL);
+ tp = args->trans;
+ mp = dp->i_mount;
+ ASSERT(bno >= XFS_DIR2_LEAF_FIRSTDB(mp) &&
+ bno < XFS_DIR2_FREE_FIRSTDB(mp));
+ /*
+ * Get the buffer for the block.
+ */
+ error = xfs_da_get_buf(tp, dp, XFS_DIR2_DB_TO_DA(mp, bno), -1, &bp,
+ XFS_DATA_FORK);
+ if (error) {
+ return error;
+ }
+ ASSERT(bp != NULL);
+ leaf = bp->data;
+ /*
+ * Initialize the header.
+ */
+ INT_SET(leaf->hdr.info.magic, ARCH_CONVERT, magic);
+ leaf->hdr.info.forw = 0;
+ leaf->hdr.info.back = 0;
+ leaf->hdr.count = 0;
+ leaf->hdr.stale = 0;
+ xfs_dir2_leaf_log_header(tp, bp);
+ /*
+ * If it's a leaf-format directory initialize the tail.
+ * In this case our caller has the real bests table to copy into
+ * the block.
+ */
+ if (magic == XFS_DIR2_LEAF1_MAGIC) {
+ ltp = XFS_DIR2_LEAF_TAIL_P(mp, leaf);
+ ltp->bestcount = 0;
+ xfs_dir2_leaf_log_tail(tp, bp);
+ }
+ *bpp = bp;
+ return 0;
+}
+
+/*
+ * Log the bests entries indicated from a leaf1 block.
+ */
+void
+xfs_dir2_leaf_log_bests(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_dabuf_t *bp, /* leaf buffer */
+ int first, /* first entry to log */
+ int last) /* last entry to log */
+{
+ xfs_dir2_data_off_t *firstb; /* pointer to first entry */
+ xfs_dir2_data_off_t *lastb; /* pointer to last entry */
+ xfs_dir2_leaf_t *leaf; /* leaf structure */
+ xfs_dir2_leaf_tail_t *ltp; /* leaf tail structure */
+
+ leaf = bp->data;
+ ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR2_LEAF1_MAGIC);
+ ltp = XFS_DIR2_LEAF_TAIL_P(tp->t_mountp, leaf);
+ firstb = XFS_DIR2_LEAF_BESTS_P(ltp) + first;
+ lastb = XFS_DIR2_LEAF_BESTS_P(ltp) + last;
+ xfs_da_log_buf(tp, bp, (uint)((char *)firstb - (char *)leaf),
+ (uint)((char *)lastb - (char *)leaf + sizeof(*lastb) - 1));
+}
+
+/*
+ * Log the leaf entries indicated from a leaf1 or leafn block.
+ */
+void
+xfs_dir2_leaf_log_ents(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_dabuf_t *bp, /* leaf buffer */
+ int first, /* first entry to log */
+ int last) /* last entry to log */
+{
+ xfs_dir2_leaf_entry_t *firstlep; /* pointer to first entry */
+ xfs_dir2_leaf_entry_t *lastlep; /* pointer to last entry */
+ xfs_dir2_leaf_t *leaf; /* leaf structure */
+
+ leaf = bp->data;
+ ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR2_LEAF1_MAGIC ||
+ INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR2_LEAFN_MAGIC);
+ firstlep = &leaf->ents[first];
+ lastlep = &leaf->ents[last];
+ xfs_da_log_buf(tp, bp, (uint)((char *)firstlep - (char *)leaf),
+ (uint)((char *)lastlep - (char *)leaf + sizeof(*lastlep) - 1));
+}
+
+/*
+ * Log the header of the leaf1 or leafn block.
+ */
+void
+xfs_dir2_leaf_log_header(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_dabuf_t *bp) /* leaf buffer */
+{
+ xfs_dir2_leaf_t *leaf; /* leaf structure */
+
+ leaf = bp->data;
+ ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR2_LEAF1_MAGIC ||
+ INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR2_LEAFN_MAGIC);
+ xfs_da_log_buf(tp, bp, (uint)((char *)&leaf->hdr - (char *)leaf),
+ (uint)(sizeof(leaf->hdr) - 1));
+}
+
+/*
+ * Log the tail of the leaf1 block.
+ */
+void
+xfs_dir2_leaf_log_tail(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_dabuf_t *bp) /* leaf buffer */
+{
+ xfs_dir2_leaf_t *leaf; /* leaf structure */
+ xfs_dir2_leaf_tail_t *ltp; /* leaf tail structure */
+ xfs_mount_t *mp; /* filesystem mount point */
+
+ mp = tp->t_mountp;
+ leaf = bp->data;
+ ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR2_LEAF1_MAGIC);
+ ltp = XFS_DIR2_LEAF_TAIL_P(mp, leaf);
+ xfs_da_log_buf(tp, bp, (uint)((char *)ltp - (char *)leaf),
+ (uint)(mp->m_dirblksize - 1));
+}
+
+/*
+ * Look up the entry referred to by args in the leaf format directory.
+ * Most of the work is done by the xfs_dir2_leaf_lookup_int routine which
+ * is also used by the node-format code.
+ */
+int
+xfs_dir2_leaf_lookup(
+ xfs_da_args_t *args) /* operation arguments */
+{
+ xfs_dabuf_t *dbp; /* data block buffer */
+ xfs_dir2_data_entry_t *dep; /* data block entry */
+ xfs_inode_t *dp; /* incore directory inode */
+ int error; /* error return code */
+ int index; /* found entry index */
+ xfs_dabuf_t *lbp; /* leaf buffer */
+ xfs_dir2_leaf_t *leaf; /* leaf structure */
+ xfs_dir2_leaf_entry_t *lep; /* leaf entry */
+ xfs_trans_t *tp; /* transaction pointer */
+
+ xfs_dir2_trace_args("leaf_lookup", args);
+ /*
+ * Look up name in the leaf block, returning both buffers and index.
+ */
+ if ((error = xfs_dir2_leaf_lookup_int(args, &lbp, &index, &dbp))) {
+ return error;
+ }
+ tp = args->trans;
+ dp = args->dp;
+ xfs_dir2_leaf_check(dp, lbp);
+ leaf = lbp->data;
+ /*
+ * Get to the leaf entry and contained data entry address.
+ */
+ lep = &leaf->ents[index];
+ /*
+ * Point to the data entry.
+ */
+ dep = (xfs_dir2_data_entry_t *)
+ ((char *)dbp->data +
+ XFS_DIR2_DATAPTR_TO_OFF(dp->i_mount, INT_GET(lep->address, ARCH_CONVERT)));
+ /*
+ * Return the found inode number.
+ */
+ args->inumber = INT_GET(dep->inumber, ARCH_CONVERT);
+ xfs_da_brelse(tp, dbp);
+ xfs_da_brelse(tp, lbp);
+ return XFS_ERROR(EEXIST);
+}
+
+/*
+ * Look up name/hash in the leaf block.
+ * Fill in indexp with the found index, and dbpp with the data buffer.
+ * If not found dbpp will be NULL, and ENOENT comes back.
+ * lbpp will always be filled in with the leaf buffer unless there's an error.
+ */
+static int /* error */
+xfs_dir2_leaf_lookup_int(
+ xfs_da_args_t *args, /* operation arguments */
+ xfs_dabuf_t **lbpp, /* out: leaf buffer */
+ int *indexp, /* out: index in leaf block */
+ xfs_dabuf_t **dbpp) /* out: data buffer */
+{
+ xfs_dir2_db_t curdb; /* current data block number */
+ xfs_dabuf_t *dbp; /* data buffer */
+ xfs_dir2_data_entry_t *dep; /* data entry */
+ xfs_inode_t *dp; /* incore directory inode */
+ int error; /* error return code */
+ int index; /* index in leaf block */
+ xfs_dabuf_t *lbp; /* leaf buffer */
+ xfs_dir2_leaf_entry_t *lep; /* leaf entry */
+ xfs_dir2_leaf_t *leaf; /* leaf structure */
+ xfs_mount_t *mp; /* filesystem mount point */
+ xfs_dir2_db_t newdb; /* new data block number */
+ xfs_trans_t *tp; /* transaction pointer */
+
+ dp = args->dp;
+ tp = args->trans;
+ mp = dp->i_mount;
+ /*
+ * Read the leaf block into the buffer.
+ */
+ if ((error =
+ xfs_da_read_buf(tp, dp, mp->m_dirleafblk, -1, &lbp,
+ XFS_DATA_FORK))) {
+ return error;
+ }
+ *lbpp = lbp;
+ leaf = lbp->data;
+ xfs_dir2_leaf_check(dp, lbp);
+ /*
+ * Look for the first leaf entry with our hash value.
+ */
+ index = xfs_dir2_leaf_search_hash(args, lbp);
+ /*
+ * Loop over all the entries with the right hash value
+ * looking to match the name.
+ */
+ for (lep = &leaf->ents[index], dbp = NULL, curdb = -1;
+ index < INT_GET(leaf->hdr.count, ARCH_CONVERT) && INT_GET(lep->hashval, ARCH_CONVERT) == args->hashval;
+ lep++, index++) {
+ /*
+ * Skip over stale leaf entries.
+ */
+ if (INT_GET(lep->address, ARCH_CONVERT) == XFS_DIR2_NULL_DATAPTR)
+ continue;
+ /*
+ * Get the new data block number.
+ */
+ newdb = XFS_DIR2_DATAPTR_TO_DB(mp, INT_GET(lep->address, ARCH_CONVERT));
+ /*
+ * If it's not the same as the old data block number,
+ * need to pitch the old one and read the new one.
+ */
+ if (newdb != curdb) {
+ if (dbp)
+ xfs_da_brelse(tp, dbp);
+ if ((error =
+ xfs_da_read_buf(tp, dp,
+ XFS_DIR2_DB_TO_DA(mp, newdb), -1, &dbp,
+ XFS_DATA_FORK))) {
+ xfs_da_brelse(tp, lbp);
+ return error;
+ }
+ xfs_dir2_data_check(dp, dbp);
+ curdb = newdb;
+ }
+ /*
+ * Point to the data entry.
+ */
+ dep = (xfs_dir2_data_entry_t *)
+ ((char *)dbp->data +
+ XFS_DIR2_DATAPTR_TO_OFF(mp, INT_GET(lep->address, ARCH_CONVERT)));
+ /*
+ * If it matches then return it.
+ */
+ if (dep->namelen == args->namelen &&
+ dep->name[0] == args->name[0] &&
+ memcmp(dep->name, args->name, args->namelen) == 0) {
+ *dbpp = dbp;
+ *indexp = index;
+ return 0;
+ }
+ }
+ /*
+ * No match found, return ENOENT.
+ */
+ ASSERT(args->oknoent);
+ if (dbp)
+ xfs_da_brelse(tp, dbp);
+ xfs_da_brelse(tp, lbp);
+ return XFS_ERROR(ENOENT);
+}
+
+/*
+ * Remove an entry from a leaf format directory.
+ */
+int /* error */
+xfs_dir2_leaf_removename(
+ xfs_da_args_t *args) /* operation arguments */
+{
+ xfs_dir2_data_off_t *bestsp; /* leaf block best freespace */
+ xfs_dir2_data_t *data; /* data block structure */
+ xfs_dir2_db_t db; /* data block number */
+ xfs_dabuf_t *dbp; /* data block buffer */
+ xfs_dir2_data_entry_t *dep; /* data entry structure */
+ xfs_inode_t *dp; /* incore directory inode */
+ int error; /* error return code */
+ xfs_dir2_db_t i; /* temporary data block # */
+ int index; /* index into leaf entries */
+ xfs_dabuf_t *lbp; /* leaf buffer */
+ 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; /* filesystem mount point */
+ int needlog; /* need to log data header */
+ int needscan; /* need to rescan data frees */
+ xfs_dir2_data_off_t oldbest; /* old value of best free */
+ xfs_trans_t *tp; /* transaction pointer */
+
+ xfs_dir2_trace_args("leaf_removename", args);
+ /*
+ * Lookup the leaf entry, get the leaf and data blocks read in.
+ */
+ if ((error = xfs_dir2_leaf_lookup_int(args, &lbp, &index, &dbp))) {
+ return error;
+ }
+ dp = args->dp;
+ tp = args->trans;
+ mp = dp->i_mount;
+ leaf = lbp->data;
+ data = dbp->data;
+ xfs_dir2_data_check(dp, dbp);
+ /*
+ * Point to the leaf entry, use that to point to the data entry.
+ */
+ lep = &leaf->ents[index];
+ db = XFS_DIR2_DATAPTR_TO_DB(mp, INT_GET(lep->address, ARCH_CONVERT));
+ dep = (xfs_dir2_data_entry_t *)
+ ((char *)data + XFS_DIR2_DATAPTR_TO_OFF(mp, INT_GET(lep->address, ARCH_CONVERT)));
+ needscan = needlog = 0;
+ oldbest = INT_GET(data->hdr.bestfree[0].length, ARCH_CONVERT);
+ ltp = XFS_DIR2_LEAF_TAIL_P(mp, leaf);
+ bestsp = XFS_DIR2_LEAF_BESTS_P(ltp);
+ ASSERT(INT_GET(bestsp[db], ARCH_CONVERT) == oldbest);
+ /*
+ * Mark the former data entry unused.
+ */
+ xfs_dir2_data_make_free(tp, dbp,
+ (xfs_dir2_data_aoff_t)((char *)dep - (char *)data),
+ XFS_DIR2_DATA_ENTSIZE(dep->namelen), &needlog, &needscan);
+ /*
+ * We just mark the leaf entry stale by putting a null in it.
+ */
+ INT_MOD(leaf->hdr.stale, ARCH_CONVERT, +1);
+ xfs_dir2_leaf_log_header(tp, lbp);
+ INT_SET(lep->address, ARCH_CONVERT, XFS_DIR2_NULL_DATAPTR);
+ xfs_dir2_leaf_log_ents(tp, lbp, index, index);
+ /*
+ * Scan the freespace in the data block again if necessary,
+ * log the data block header if necessary.
+ */
+ if (needscan)
+ xfs_dir2_data_freescan(mp, data, &needlog, NULL);
+ if (needlog)
+ xfs_dir2_data_log_header(tp, dbp);
+ /*
+ * If the longest freespace in the data block has changed,
+ * put the new value in the bests table and log that.
+ */
+ if (INT_GET(data->hdr.bestfree[0].length, ARCH_CONVERT) != oldbest) {
+ INT_COPY(bestsp[db], data->hdr.bestfree[0].length, ARCH_CONVERT);
+ xfs_dir2_leaf_log_bests(tp, lbp, db, db);
+ }
+ xfs_dir2_data_check(dp, dbp);
+ /*
+ * If the data block is now empty then get rid of the data block.
+ */
+ if (INT_GET(data->hdr.bestfree[0].length, ARCH_CONVERT) ==
+ mp->m_dirblksize - (uint)sizeof(data->hdr)) {
+ ASSERT(db != mp->m_dirdatablk);
+ if ((error = xfs_dir2_shrink_inode(args, db, dbp))) {
+ /*
+ * Nope, can't get rid of it because it caused
+ * allocation of a bmap btree block to do so.
+ * Just go on, returning success, leaving the
+ * empty block in place.
+ */
+ if (error == ENOSPC && args->total == 0) {
+ xfs_da_buf_done(dbp);
+ error = 0;
+ }
+ xfs_dir2_leaf_check(dp, lbp);
+ xfs_da_buf_done(lbp);
+ return error;
+ }
+ dbp = NULL;
+ /*
+ * If this is the last data block then compact the
+ * bests table by getting rid of entries.
+ */
+ if (db == INT_GET(ltp->bestcount, ARCH_CONVERT) - 1) {
+ /*
+ * Look for the last active entry (i).
+ */
+ for (i = db - 1; i > 0; i--) {
+ if (INT_GET(bestsp[i], ARCH_CONVERT) != NULLDATAOFF)
+ break;
+ }
+ /*
+ * Copy the table down so inactive entries at the
+ * end are removed.
+ */
+ memmove(&bestsp[db - i], bestsp,
+ (INT_GET(ltp->bestcount, ARCH_CONVERT) - (db - i)) * sizeof(*bestsp));
+ INT_MOD(ltp->bestcount, ARCH_CONVERT, -(db - i));
+ xfs_dir2_leaf_log_tail(tp, lbp);
+ xfs_dir2_leaf_log_bests(tp, lbp, 0, INT_GET(ltp->bestcount, ARCH_CONVERT) - 1);
+ } else
+ INT_SET(bestsp[db], ARCH_CONVERT, NULLDATAOFF);
+ }
+ /*
+ * If the data block was not the first one, drop it.
+ */
+ else if (db != mp->m_dirdatablk && dbp != NULL) {
+ xfs_da_buf_done(dbp);
+ dbp = NULL;
+ }
+ xfs_dir2_leaf_check(dp, lbp);
+ /*
+ * See if we can convert to block form.
+ */
+ return xfs_dir2_leaf_to_block(args, lbp, dbp);
+}
+
+/*
+ * Replace the inode number in a leaf format directory entry.
+ */
+int /* error */
+xfs_dir2_leaf_replace(
+ xfs_da_args_t *args) /* operation arguments */
+{
+ xfs_dabuf_t *dbp; /* data block buffer */
+ xfs_dir2_data_entry_t *dep; /* data block entry */
+ xfs_inode_t *dp; /* incore directory inode */
+ int error; /* error return code */
+ int index; /* index of leaf entry */
+ xfs_dabuf_t *lbp; /* leaf buffer */
+ xfs_dir2_leaf_t *leaf; /* leaf structure */
+ xfs_dir2_leaf_entry_t *lep; /* leaf entry */
+ xfs_trans_t *tp; /* transaction pointer */
+
+ xfs_dir2_trace_args("leaf_replace", args);
+ /*
+ * Look up the entry.
+ */
+ if ((error = xfs_dir2_leaf_lookup_int(args, &lbp, &index, &dbp))) {
+ return error;
+ }
+ dp = args->dp;
+ leaf = lbp->data;
+ /*
+ * Point to the leaf entry, get data address from it.
+ */
+ lep = &leaf->ents[index];
+ /*
+ * Point to the data entry.
+ */
+ dep = (xfs_dir2_data_entry_t *)
+ ((char *)dbp->data +
+ XFS_DIR2_DATAPTR_TO_OFF(dp->i_mount, INT_GET(lep->address, ARCH_CONVERT)));
+ ASSERT(args->inumber != INT_GET(dep->inumber, ARCH_CONVERT));
+ /*
+ * Put the new inode number in, log it.
+ */
+ INT_SET(dep->inumber, ARCH_CONVERT, args->inumber);
+ tp = args->trans;
+ xfs_dir2_data_log_entry(tp, dbp, dep);
+ xfs_da_buf_done(dbp);
+ xfs_dir2_leaf_check(dp, lbp);
+ xfs_da_brelse(tp, lbp);
+ return 0;
+}
+
+/*
+ * Return index in the leaf block (lbp) which is either the first
+ * one with this hash value, or if there are none, the insert point
+ * for that hash value.
+ */
+int /* index value */
+xfs_dir2_leaf_search_hash(
+ xfs_da_args_t *args, /* operation arguments */
+ xfs_dabuf_t *lbp) /* leaf buffer */
+{
+ xfs_dahash_t hash=0; /* hash from this entry */
+ xfs_dahash_t hashwant; /* hash value looking for */
+ int high; /* high leaf index */
+ int low; /* low leaf index */
+ xfs_dir2_leaf_t *leaf; /* leaf structure */
+ xfs_dir2_leaf_entry_t *lep; /* leaf entry */
+ int mid=0; /* current leaf index */
+
+ leaf = lbp->data;
+#ifndef __KERNEL__
+ if (!leaf->hdr.count)
+ return 0;
+#endif
+ /*
+ * Note, the table cannot be empty, so we have to go through the loop.
+ * Binary search the leaf entries looking for our hash value.
+ */
+ for (lep = leaf->ents, low = 0, high = INT_GET(leaf->hdr.count, ARCH_CONVERT) - 1,
+ hashwant = args->hashval;
+ low <= high; ) {
+ mid = (low + high) >> 1;
+ if ((hash = INT_GET(lep[mid].hashval, ARCH_CONVERT)) == hashwant)
+ break;
+ if (hash < hashwant)
+ low = mid + 1;
+ else
+ high = mid - 1;
+ }
+ /*
+ * Found one, back up through all the equal hash values.
+ */
+ if (hash == hashwant) {
+ while (mid > 0 && INT_GET(lep[mid - 1].hashval, ARCH_CONVERT) == hashwant) {
+ mid--;
+ }
+ }
+ /*
+ * Need to point to an entry higher than ours.
+ */
+ else if (hash < hashwant)
+ mid++;
+ return mid;
+}
+
+/*
+ * Trim off a trailing data block. We know it's empty since the leaf
+ * freespace table says so.
+ */
+int /* error */
+xfs_dir2_leaf_trim_data(
+ xfs_da_args_t *args, /* operation arguments */
+ xfs_dabuf_t *lbp, /* leaf buffer */
+ xfs_dir2_db_t db) /* data block number */
+{
+ xfs_dir2_data_off_t *bestsp; /* leaf bests table */
+#ifdef DEBUG
+ xfs_dir2_data_t *data; /* data block structure */
+#endif
+ xfs_dabuf_t *dbp; /* data block buffer */
+ xfs_inode_t *dp; /* incore directory inode */
+ int error; /* error return value */
+ xfs_dir2_leaf_t *leaf; /* leaf structure */
+ xfs_dir2_leaf_tail_t *ltp; /* leaf tail structure */
+ xfs_mount_t *mp; /* filesystem mount point */
+ xfs_trans_t *tp; /* transaction pointer */
+
+ dp = args->dp;
+ mp = dp->i_mount;
+ tp = args->trans;
+ /*
+ * Read the offending data block. We need its buffer.
+ */
+ if ((error = xfs_da_read_buf(tp, dp, XFS_DIR2_DB_TO_DA(mp, db), -1, &dbp,
+ XFS_DATA_FORK))) {
+ return error;
+ }
+#ifdef DEBUG
+ data = dbp->data;
+ ASSERT(INT_GET(data->hdr.magic, ARCH_CONVERT) == XFS_DIR2_DATA_MAGIC);
+#endif
+ /* this seems to be an error
+ * data is only valid if DEBUG is defined?
+ * RMC 09/08/1999
+ */
+
+ leaf = lbp->data;
+ ltp = XFS_DIR2_LEAF_TAIL_P(mp, leaf);
+ ASSERT(INT_GET(data->hdr.bestfree[0].length, ARCH_CONVERT) ==
+ mp->m_dirblksize - (uint)sizeof(data->hdr));
+ ASSERT(db == INT_GET(ltp->bestcount, ARCH_CONVERT) - 1);
+ /*
+ * Get rid of the data block.
+ */
+ if ((error = xfs_dir2_shrink_inode(args, db, dbp))) {
+ ASSERT(error != ENOSPC);
+ xfs_da_brelse(tp, dbp);
+ return error;
+ }
+ /*
+ * Eliminate the last bests entry from the table.
+ */
+ bestsp = XFS_DIR2_LEAF_BESTS_P(ltp);
+ INT_MOD(ltp->bestcount, ARCH_CONVERT, -1);
+ memmove(&bestsp[1], &bestsp[0], INT_GET(ltp->bestcount, ARCH_CONVERT) * sizeof(*bestsp));
+ xfs_dir2_leaf_log_tail(tp, lbp);
+ xfs_dir2_leaf_log_bests(tp, lbp, 0, INT_GET(ltp->bestcount, ARCH_CONVERT) - 1);
+ return 0;
+}
+
+/*
+ * Convert node form directory to leaf form directory.
+ * The root of the node form dir needs to already be a LEAFN block.
+ * Just return if we can't do anything.
+ */
+int /* error */
+xfs_dir2_node_to_leaf(
+ xfs_da_state_t *state) /* directory operation state */
+{
+ xfs_da_args_t *args; /* operation arguments */
+ xfs_inode_t *dp; /* incore directory inode */
+ int error; /* error return code */
+ xfs_dabuf_t *fbp; /* buffer for freespace block */
+ xfs_fileoff_t fo; /* freespace file offset */
+ xfs_dir2_free_t *free; /* freespace structure */
+ xfs_dabuf_t *lbp; /* buffer for leaf block */
+ xfs_dir2_leaf_tail_t *ltp; /* tail of leaf structure */
+ xfs_dir2_leaf_t *leaf; /* leaf structure */
+ xfs_mount_t *mp; /* filesystem mount point */
+ int rval; /* successful free trim? */
+ xfs_trans_t *tp; /* transaction pointer */
+
+ /*
+ * There's more than a leaf level in the btree, so there must
+ * be multiple leafn blocks. Give up.
+ */
+ if (state->path.active > 1)
+ return 0;
+ args = state->args;
+ xfs_dir2_trace_args("node_to_leaf", args);
+ mp = state->mp;
+ dp = args->dp;
+ tp = args->trans;
+ /*
+ * Get the last offset in the file.
+ */
+ if ((error = xfs_bmap_last_offset(tp, dp, &fo, XFS_DATA_FORK))) {
+ return error;
+ }
+ fo -= mp->m_dirblkfsbs;
+ /*
+ * If there are freespace blocks other than the first one,
+ * take this opportunity to remove trailing empty freespace blocks
+ * that may have been left behind during no-space-reservation
+ * operations.
+ */
+ while (fo > mp->m_dirfreeblk) {
+ if ((error = xfs_dir2_node_trim_free(args, fo, &rval))) {
+ return error;
+ }
+ if (rval)
+ fo -= mp->m_dirblkfsbs;
+ else
+ return 0;
+ }
+ /*
+ * Now find the block just before the freespace block.
+ */
+ if ((error = xfs_bmap_last_before(tp, dp, &fo, XFS_DATA_FORK))) {
+ return error;
+ }
+ /*
+ * If it's not the single leaf block, give up.
+ */
+ if (XFS_FSB_TO_B(mp, fo) > XFS_DIR2_LEAF_OFFSET + mp->m_dirblksize)
+ return 0;
+ lbp = state->path.blk[0].bp;
+ leaf = lbp->data;
+ ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR2_LEAFN_MAGIC);
+ /*
+ * Read the freespace block.
+ */
+ if ((error = xfs_da_read_buf(tp, dp, mp->m_dirfreeblk, -1, &fbp,
+ XFS_DATA_FORK))) {
+ return error;
+ }
+ free = fbp->data;
+ ASSERT(INT_GET(free->hdr.magic, ARCH_CONVERT) == XFS_DIR2_FREE_MAGIC);
+ ASSERT(!free->hdr.firstdb);
+ /*
+ * Now see if the leafn and free data will fit in a leaf1.
+ * If not, release the buffer and give up.
+ */
+ if ((uint)sizeof(leaf->hdr) +
+ (INT_GET(leaf->hdr.count, ARCH_CONVERT) - INT_GET(leaf->hdr.stale, ARCH_CONVERT)) * (uint)sizeof(leaf->ents[0]) +
+ INT_GET(free->hdr.nvalid, ARCH_CONVERT) * (uint)sizeof(leaf->bests[0]) +
+ (uint)sizeof(leaf->tail) >
+ mp->m_dirblksize) {
+ xfs_da_brelse(tp, fbp);
+ return 0;
+ }
+ /*
+ * If the leaf has any stale entries in it, compress them out.
+ * The compact routine will log the header.
+ */
+ if (INT_GET(leaf->hdr.stale, ARCH_CONVERT))
+ xfs_dir2_leaf_compact(args, lbp);
+ else
+ xfs_dir2_leaf_log_header(tp, lbp);
+ INT_SET(leaf->hdr.info.magic, ARCH_CONVERT, XFS_DIR2_LEAF1_MAGIC);
+ /*
+ * Set up the leaf tail from the freespace block.
+ */
+ ltp = XFS_DIR2_LEAF_TAIL_P(mp, leaf);
+ INT_COPY(ltp->bestcount, free->hdr.nvalid, ARCH_CONVERT);
+ /*
+ * Set up the leaf bests table.
+ */
+ memcpy(XFS_DIR2_LEAF_BESTS_P(ltp), free->bests,
+ INT_GET(ltp->bestcount, ARCH_CONVERT) * sizeof(leaf->bests[0]));
+ xfs_dir2_leaf_log_bests(tp, lbp, 0, INT_GET(ltp->bestcount, ARCH_CONVERT) - 1);
+ xfs_dir2_leaf_log_tail(tp, lbp);
+ xfs_dir2_leaf_check(dp, lbp);
+ /*
+ * Get rid of the freespace block.
+ */
+ error = xfs_dir2_shrink_inode(args, XFS_DIR2_FREE_FIRSTDB(mp), fbp);
+ if (error) {
+ /*
+ * This can't fail here because it can only happen when
+ * punching out the middle of an extent, and this is an
+ * isolated block.
+ */
+ ASSERT(error != ENOSPC);
+ return error;
+ }
+ fbp = NULL;
+ /*
+ * Now see if we can convert the single-leaf directory
+ * down to a block form directory.
+ * This routine always kills the dabuf for the leaf, so
+ * eliminate it from the path.
+ */
+ error = xfs_dir2_leaf_to_block(args, lbp, NULL);
+ state->path.blk[0].bp = NULL;
+ return error;
+}