patch-2.4.25 linux-2.4.25/fs/xfs/xfs_dir2_node.c
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- Lines: 1999
- Date:
2004-02-18 05:36:32.000000000 -0800
- Orig file:
linux-2.4.24/fs/xfs/xfs_dir2_node.c
- Orig date:
1969-12-31 16:00:00.000000000 -0800
diff -urN linux-2.4.24/fs/xfs/xfs_dir2_node.c linux-2.4.25/fs/xfs/xfs_dir2_node.c
@@ -0,0 +1,1998 @@
+/*
+ * Copyright (c) 2000-2002 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_node.c
+ * XFS directory implementation, version 2, node form files
+ * See data structures in xfs_dir2_node.h and xfs_da_btree.h.
+ */
+
+#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.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"
+
+/*
+ * Function declarations.
+ */
+static void xfs_dir2_free_log_header(xfs_trans_t *tp, xfs_dabuf_t *bp);
+static int xfs_dir2_leafn_add(xfs_dabuf_t *bp, xfs_da_args_t *args, int index);
+#ifdef DEBUG
+static void xfs_dir2_leafn_check(xfs_inode_t *dp, xfs_dabuf_t *bp);
+#else
+#define xfs_dir2_leafn_check(dp, bp)
+#endif
+static void xfs_dir2_leafn_moveents(xfs_da_args_t *args, xfs_dabuf_t *bp_s,
+ int start_s, xfs_dabuf_t *bp_d, int start_d,
+ int count);
+static void xfs_dir2_leafn_rebalance(xfs_da_state_t *state,
+ xfs_da_state_blk_t *blk1,
+ xfs_da_state_blk_t *blk2);
+static int xfs_dir2_leafn_remove(xfs_da_args_t *args, xfs_dabuf_t *bp,
+ int index, xfs_da_state_blk_t *dblk,
+ int *rval);
+static int xfs_dir2_node_addname_int(xfs_da_args_t *args,
+ xfs_da_state_blk_t *fblk);
+
+/*
+ * Log entries from a freespace block.
+ */
+void
+xfs_dir2_free_log_bests(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_dabuf_t *bp, /* freespace buffer */
+ int first, /* first entry to log */
+ int last) /* last entry to log */
+{
+ xfs_dir2_free_t *free; /* freespace structure */
+
+ free = bp->data;
+ ASSERT(INT_GET(free->hdr.magic, ARCH_CONVERT) == XFS_DIR2_FREE_MAGIC);
+ xfs_da_log_buf(tp, bp,
+ (uint)((char *)&free->bests[first] - (char *)free),
+ (uint)((char *)&free->bests[last] - (char *)free +
+ sizeof(free->bests[0]) - 1));
+}
+
+/*
+ * Log header from a freespace block.
+ */
+static void
+xfs_dir2_free_log_header(
+ xfs_trans_t *tp, /* transaction pointer */
+ xfs_dabuf_t *bp) /* freespace buffer */
+{
+ xfs_dir2_free_t *free; /* freespace structure */
+
+ free = bp->data;
+ ASSERT(INT_GET(free->hdr.magic, ARCH_CONVERT) == XFS_DIR2_FREE_MAGIC);
+ xfs_da_log_buf(tp, bp, (uint)((char *)&free->hdr - (char *)free),
+ (uint)(sizeof(xfs_dir2_free_hdr_t) - 1));
+}
+
+/*
+ * Convert a leaf-format directory to a node-format directory.
+ * We need to change the magic number of the leaf block, and copy
+ * the freespace table out of the leaf block into its own block.
+ */
+int /* error */
+xfs_dir2_leaf_to_node(
+ xfs_da_args_t *args, /* operation arguments */
+ xfs_dabuf_t *lbp) /* leaf buffer */
+{
+ xfs_inode_t *dp; /* incore directory inode */
+ int error; /* error return value */
+ xfs_dabuf_t *fbp; /* freespace buffer */
+ xfs_dir2_db_t fdb; /* freespace block number */
+ xfs_dir2_free_t *free; /* freespace structure */
+ xfs_dir2_data_off_t *from; /* pointer to freespace entry */
+ int i; /* leaf freespace index */
+ xfs_dir2_leaf_t *leaf; /* leaf structure */
+ xfs_dir2_leaf_tail_t *ltp; /* leaf tail structure */
+ xfs_mount_t *mp; /* filesystem mount point */
+ int n; /* count of live freespc ents */
+ xfs_dir2_data_off_t off; /* freespace entry value */
+ xfs_dir2_data_off_t *to; /* pointer to freespace entry */
+ xfs_trans_t *tp; /* transaction pointer */
+
+ xfs_dir2_trace_args_b("leaf_to_node", args, lbp);
+ dp = args->dp;
+ mp = dp->i_mount;
+ tp = args->trans;
+ /*
+ * Add a freespace block to the directory.
+ */
+ if ((error = xfs_dir2_grow_inode(args, XFS_DIR2_FREE_SPACE, &fdb))) {
+ return error;
+ }
+ ASSERT(fdb == XFS_DIR2_FREE_FIRSTDB(mp));
+ /*
+ * Get the buffer for the new freespace block.
+ */
+ if ((error = xfs_da_get_buf(tp, dp, XFS_DIR2_DB_TO_DA(mp, fdb), -1, &fbp,
+ XFS_DATA_FORK))) {
+ return error;
+ }
+ ASSERT(fbp != NULL);
+ free = fbp->data;
+ leaf = lbp->data;
+ ltp = XFS_DIR2_LEAF_TAIL_P(mp, leaf);
+ /*
+ * Initialize the freespace block header.
+ */
+ INT_SET(free->hdr.magic, ARCH_CONVERT, XFS_DIR2_FREE_MAGIC);
+ INT_ZERO(free->hdr.firstdb, ARCH_CONVERT);
+ ASSERT(INT_GET(ltp->bestcount, ARCH_CONVERT) <= (uint)dp->i_d.di_size / mp->m_dirblksize);
+ INT_COPY(free->hdr.nvalid, ltp->bestcount, ARCH_CONVERT);
+ /*
+ * Copy freespace entries from the leaf block to the new block.
+ * Count active entries.
+ */
+ for (i = n = 0, from = XFS_DIR2_LEAF_BESTS_P_ARCH(ltp, ARCH_CONVERT), to = free->bests;
+ i < INT_GET(ltp->bestcount, ARCH_CONVERT); i++, from++, to++) {
+ if ((off = INT_GET(*from, ARCH_CONVERT)) != NULLDATAOFF)
+ n++;
+ INT_SET(*to, ARCH_CONVERT, off);
+ }
+ INT_SET(free->hdr.nused, ARCH_CONVERT, n);
+ INT_SET(leaf->hdr.info.magic, ARCH_CONVERT, XFS_DIR2_LEAFN_MAGIC);
+ /*
+ * Log everything.
+ */
+ xfs_dir2_leaf_log_header(tp, lbp);
+ xfs_dir2_free_log_header(tp, fbp);
+ xfs_dir2_free_log_bests(tp, fbp, 0, INT_GET(free->hdr.nvalid, ARCH_CONVERT) - 1);
+ xfs_da_buf_done(fbp);
+ xfs_dir2_leafn_check(dp, lbp);
+ return 0;
+}
+
+/*
+ * Add a leaf entry to a leaf block in a node-form directory.
+ * The other work necessary is done from the caller.
+ */
+static int /* error */
+xfs_dir2_leafn_add(
+ xfs_dabuf_t *bp, /* leaf buffer */
+ xfs_da_args_t *args, /* operation arguments */
+ int index) /* insertion pt for new entry */
+{
+ int compact; /* compacting stale leaves */
+ xfs_inode_t *dp; /* incore directory inode */
+ int highstale; /* next stale entry */
+ xfs_dir2_leaf_t *leaf; /* leaf structure */
+ xfs_dir2_leaf_entry_t *lep; /* leaf entry */
+ int lfloghigh; /* high leaf entry logging */
+ int lfloglow; /* low leaf entry logging */
+ int lowstale; /* previous stale entry */
+ xfs_mount_t *mp; /* filesystem mount point */
+ xfs_trans_t *tp; /* transaction pointer */
+
+ xfs_dir2_trace_args_sb("leafn_add", args, index, bp);
+ dp = args->dp;
+ mp = dp->i_mount;
+ tp = args->trans;
+ leaf = bp->data;
+ /*
+ * If there are already the maximum number of leaf entries in
+ * the block, if there are no stale entries it won't fit.
+ * Caller will do a split. If there are stale entries we'll do
+ * a compact.
+ */
+ if (INT_GET(leaf->hdr.count, ARCH_CONVERT) == XFS_DIR2_MAX_LEAF_ENTS(mp)) {
+ if (INT_ISZERO(leaf->hdr.stale, ARCH_CONVERT))
+ return XFS_ERROR(ENOSPC);
+ compact = INT_GET(leaf->hdr.stale, ARCH_CONVERT) > 1;
+ } else
+ compact = 0;
+ ASSERT(index == 0 || INT_GET(leaf->ents[index - 1].hashval, ARCH_CONVERT) <= args->hashval);
+ ASSERT(index == INT_GET(leaf->hdr.count, ARCH_CONVERT) ||
+ INT_GET(leaf->ents[index].hashval, ARCH_CONVERT) >= args->hashval);
+
+ if (args->justcheck)
+ return 0;
+
+ /*
+ * Compact out all but one stale leaf entry. Leaves behind
+ * the entry closest to index.
+ */
+ if (compact) {
+ xfs_dir2_leaf_compact_x1(bp, &index, &lowstale, &highstale,
+ &lfloglow, &lfloghigh);
+ }
+ /*
+ * Set impossible logging indices for this case.
+ */
+ else if (!INT_ISZERO(leaf->hdr.stale, ARCH_CONVERT)) {
+ lfloglow = INT_GET(leaf->hdr.count, ARCH_CONVERT);
+ lfloghigh = -1;
+ }
+ /*
+ * No stale entries, just insert a space for the new entry.
+ */
+ if (INT_ISZERO(leaf->hdr.stale, ARCH_CONVERT)) {
+ lep = &leaf->ents[index];
+ if (index < INT_GET(leaf->hdr.count, ARCH_CONVERT))
+ memmove(lep + 1, lep,
+ (INT_GET(leaf->hdr.count, ARCH_CONVERT) - index) * sizeof(*lep));
+ lfloglow = index;
+ lfloghigh = INT_GET(leaf->hdr.count, ARCH_CONVERT);
+ INT_MOD(leaf->hdr.count, ARCH_CONVERT, +1);
+ }
+ /*
+ * There are stale entries. We'll use one for the new entry.
+ */
+ else {
+ /*
+ * If we didn't do a compact then we need to figure out
+ * which stale entry will be used.
+ */
+ if (compact == 0) {
+ /*
+ * Find first stale entry before our insertion point.
+ */
+ for (lowstale = index - 1;
+ lowstale >= 0 &&
+ INT_GET(leaf->ents[lowstale].address, ARCH_CONVERT) !=
+ XFS_DIR2_NULL_DATAPTR;
+ lowstale--)
+ continue;
+ /*
+ * Find next stale entry after insertion point.
+ * Stop looking if the answer would be worse than
+ * lowstale already found.
+ */
+ 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;
+ }
+ /*
+ * Using the low stale entry.
+ * Shift entries up toward the stale slot.
+ */
+ if (lowstale >= 0 &&
+ (highstale == INT_GET(leaf->hdr.count, ARCH_CONVERT) ||
+ index - lowstale - 1 < highstale - index)) {
+ ASSERT(INT_GET(leaf->ents[lowstale].address, ARCH_CONVERT) ==
+ XFS_DIR2_NULL_DATAPTR);
+ ASSERT(index - lowstale - 1 >= 0);
+ 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);
+ }
+ /*
+ * Using the high stale entry.
+ * Shift entries down toward the stale slot.
+ */
+ else {
+ ASSERT(INT_GET(leaf->ents[highstale].address, ARCH_CONVERT) ==
+ XFS_DIR2_NULL_DATAPTR);
+ ASSERT(highstale - index >= 0);
+ 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);
+ }
+ /*
+ * Insert the new entry, log everything.
+ */
+ INT_SET(lep->hashval, ARCH_CONVERT, args->hashval);
+ INT_SET(lep->address, ARCH_CONVERT, XFS_DIR2_DB_OFF_TO_DATAPTR(mp, args->blkno, args->index));
+ xfs_dir2_leaf_log_header(tp, bp);
+ xfs_dir2_leaf_log_ents(tp, bp, lfloglow, lfloghigh);
+ xfs_dir2_leafn_check(dp, bp);
+ return 0;
+}
+
+#ifdef DEBUG
+/*
+ * Check internal consistency of a leafn block.
+ */
+void
+xfs_dir2_leafn_check(
+ xfs_inode_t *dp, /* incore directory inode */
+ xfs_dabuf_t *bp) /* leaf buffer */
+{
+ int i; /* leaf index */
+ xfs_dir2_leaf_t *leaf; /* leaf structure */
+ 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_LEAFN_MAGIC);
+ ASSERT(INT_GET(leaf->hdr.count, ARCH_CONVERT) <= XFS_DIR2_MAX_LEAF_ENTS(mp));
+ 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 */
+
+/*
+ * Return the last hash value in the leaf.
+ * Stale entries are ok.
+ */
+xfs_dahash_t /* hash value */
+xfs_dir2_leafn_lasthash(
+ xfs_dabuf_t *bp, /* leaf buffer */
+ int *count) /* count of entries in leaf */
+{
+ xfs_dir2_leaf_t *leaf; /* leaf structure */
+
+ leaf = bp->data;
+ ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR2_LEAFN_MAGIC);
+ if (count)
+ *count = INT_GET(leaf->hdr.count, ARCH_CONVERT);
+ if (INT_ISZERO(leaf->hdr.count, ARCH_CONVERT))
+ return 0;
+ return INT_GET(leaf->ents[INT_GET(leaf->hdr.count, ARCH_CONVERT) - 1].hashval, ARCH_CONVERT);
+}
+
+/*
+ * Look up a leaf entry in a node-format leaf block.
+ * If this is an addname then the extrablk in state is a freespace block,
+ * otherwise it's a data block.
+ */
+int
+xfs_dir2_leafn_lookup_int(
+ xfs_dabuf_t *bp, /* leaf buffer */
+ xfs_da_args_t *args, /* operation arguments */
+ int *indexp, /* out: leaf entry index */
+ xfs_da_state_t *state) /* state to fill in */
+{
+ xfs_dabuf_t *curbp; /* current data/free buffer */
+ xfs_dir2_db_t curdb; /* current data block number */
+ xfs_dir2_db_t curfdb; /* current free block number */
+ xfs_dir2_data_entry_t *dep; /* data block entry */
+ xfs_inode_t *dp; /* incore directory inode */
+ int error; /* error return value */
+ int fi; /* free entry index */
+ xfs_dir2_free_t *free=NULL; /* free block structure */
+ int index; /* leaf entry index */
+ xfs_dir2_leaf_t *leaf; /* leaf structure */
+ int length=0; /* length of new data entry */
+ xfs_dir2_leaf_entry_t *lep; /* leaf entry */
+ xfs_mount_t *mp; /* filesystem mount point */
+ xfs_dir2_db_t newdb; /* new data block number */
+ xfs_dir2_db_t newfdb; /* new free block number */
+ xfs_trans_t *tp; /* transaction pointer */
+
+ dp = args->dp;
+ tp = args->trans;
+ mp = dp->i_mount;
+ leaf = bp->data;
+ ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR2_LEAFN_MAGIC);
+#ifdef __KERNEL__
+ ASSERT(INT_GET(leaf->hdr.count, ARCH_CONVERT) > 0);
+#endif
+ xfs_dir2_leafn_check(dp, bp);
+ /*
+ * Look up the hash value in the leaf entries.
+ */
+ index = xfs_dir2_leaf_search_hash(args, bp);
+ /*
+ * Do we have a buffer coming in?
+ */
+ if (state->extravalid)
+ curbp = state->extrablk.bp;
+ else
+ curbp = NULL;
+ /*
+ * For addname, it's a free block buffer, get the block number.
+ */
+ if (args->addname) {
+ curfdb = curbp ? state->extrablk.blkno : -1;
+ curdb = -1;
+ length = XFS_DIR2_DATA_ENTSIZE(args->namelen);
+ if ((free = (curbp ? curbp->data : NULL)))
+ ASSERT(INT_GET(free->hdr.magic, ARCH_CONVERT) == XFS_DIR2_FREE_MAGIC);
+ }
+ /*
+ * For others, it's a data block buffer, get the block number.
+ */
+ else {
+ curfdb = -1;
+ curdb = curbp ? state->extrablk.blkno : -1;
+ }
+ /*
+ * Loop over leaf entries with the right hash value.
+ */
+ for (lep = &leaf->ents[index];
+ index < INT_GET(leaf->hdr.count, ARCH_CONVERT) && INT_GET(lep->hashval, ARCH_CONVERT) == args->hashval;
+ lep++, index++) {
+ /*
+ * Skip stale leaf entries.
+ */
+ if (INT_GET(lep->address, ARCH_CONVERT) == XFS_DIR2_NULL_DATAPTR)
+ continue;
+ /*
+ * Pull the data block number from the entry.
+ */
+ newdb = XFS_DIR2_DATAPTR_TO_DB(mp, INT_GET(lep->address, ARCH_CONVERT));
+ /*
+ * For addname, we're looking for a place to put the new entry.
+ * We want to use a data block with an entry of equal
+ * hash value to ours if there is one with room.
+ */
+ if (args->addname) {
+ /*
+ * If this block isn't the data block we already have
+ * in hand, take a look at it.
+ */
+ if (newdb != curdb) {
+ curdb = newdb;
+ /*
+ * Convert the data block to the free block
+ * holding its freespace information.
+ */
+ newfdb = XFS_DIR2_DB_TO_FDB(mp, newdb);
+ /*
+ * If it's not the one we have in hand,
+ * read it in.
+ */
+ if (newfdb != curfdb) {
+ /*
+ * If we had one before, drop it.
+ */
+ if (curbp)
+ xfs_da_brelse(tp, curbp);
+ /*
+ * Read the free block.
+ */
+ if ((error = xfs_da_read_buf(tp, dp,
+ XFS_DIR2_DB_TO_DA(mp,
+ newfdb),
+ -1, &curbp,
+ XFS_DATA_FORK))) {
+ return error;
+ }
+ curfdb = newfdb;
+ free = curbp->data;
+ ASSERT(INT_GET(free->hdr.magic, ARCH_CONVERT) ==
+ XFS_DIR2_FREE_MAGIC);
+ ASSERT((INT_GET(free->hdr.firstdb, ARCH_CONVERT) %
+ XFS_DIR2_MAX_FREE_BESTS(mp)) ==
+ 0);
+ ASSERT(INT_GET(free->hdr.firstdb, ARCH_CONVERT) <= curdb);
+ ASSERT(curdb <
+ INT_GET(free->hdr.firstdb, ARCH_CONVERT) +
+ INT_GET(free->hdr.nvalid, ARCH_CONVERT));
+ }
+ /*
+ * Get the index for our entry.
+ */
+ fi = XFS_DIR2_DB_TO_FDINDEX(mp, curdb);
+ /*
+ * If it has room, return it.
+ */
+ if (unlikely(INT_GET(free->bests[fi], ARCH_CONVERT) == NULLDATAOFF)) {
+ XFS_ERROR_REPORT("xfs_dir2_leafn_lookup_int",
+ XFS_ERRLEVEL_LOW, mp);
+ return XFS_ERROR(EFSCORRUPTED);
+ }
+ if (INT_GET(free->bests[fi], ARCH_CONVERT) >= length) {
+ *indexp = index;
+ state->extravalid = 1;
+ state->extrablk.bp = curbp;
+ state->extrablk.blkno = curfdb;
+ state->extrablk.index = fi;
+ state->extrablk.magic =
+ XFS_DIR2_FREE_MAGIC;
+ ASSERT(args->oknoent);
+ return XFS_ERROR(ENOENT);
+ }
+ }
+ }
+ /*
+ * Not adding a new entry, so we really want to find
+ * the name given to us.
+ */
+ else {
+ /*
+ * If it's a different data block, go get it.
+ */
+ if (newdb != curdb) {
+ /*
+ * If we had a block before, drop it.
+ */
+ if (curbp)
+ xfs_da_brelse(tp, curbp);
+ /*
+ * Read the data block.
+ */
+ if ((error =
+ xfs_da_read_buf(tp, dp,
+ XFS_DIR2_DB_TO_DA(mp, newdb), -1,
+ &curbp, XFS_DATA_FORK))) {
+ return error;
+ }
+ xfs_dir2_data_check(dp, curbp);
+ curdb = newdb;
+ }
+ /*
+ * Point to the data entry.
+ */
+ dep = (xfs_dir2_data_entry_t *)
+ ((char *)curbp->data +
+ XFS_DIR2_DATAPTR_TO_OFF(mp, INT_GET(lep->address, ARCH_CONVERT)));
+ /*
+ * Compare the entry, return it if it matches.
+ */
+ if (dep->namelen == args->namelen &&
+ dep->name[0] == args->name[0] &&
+ memcmp(dep->name, args->name, args->namelen) == 0) {
+ args->inumber = INT_GET(dep->inumber, ARCH_CONVERT);
+ *indexp = index;
+ state->extravalid = 1;
+ state->extrablk.bp = curbp;
+ state->extrablk.blkno = curdb;
+ state->extrablk.index =
+ (int)((char *)dep -
+ (char *)curbp->data);
+ state->extrablk.magic = XFS_DIR2_DATA_MAGIC;
+ return XFS_ERROR(EEXIST);
+ }
+ }
+ }
+ /*
+ * Didn't find a match.
+ * If we are holding a buffer, give it back in case our caller
+ * finds it useful.
+ */
+ if ((state->extravalid = (curbp != NULL))) {
+ state->extrablk.bp = curbp;
+ state->extrablk.index = -1;
+ /*
+ * For addname, giving back a free block.
+ */
+ if (args->addname) {
+ state->extrablk.blkno = curfdb;
+ state->extrablk.magic = XFS_DIR2_FREE_MAGIC;
+ }
+ /*
+ * For other callers, giving back a data block.
+ */
+ else {
+ state->extrablk.blkno = curdb;
+ state->extrablk.magic = XFS_DIR2_DATA_MAGIC;
+ }
+ }
+ /*
+ * Return the final index, that will be the insertion point.
+ */
+ *indexp = index;
+ ASSERT(index == INT_GET(leaf->hdr.count, ARCH_CONVERT) || args->oknoent);
+ return XFS_ERROR(ENOENT);
+}
+
+/*
+ * Move count leaf entries from source to destination leaf.
+ * Log entries and headers. Stale entries are preserved.
+ */
+static void
+xfs_dir2_leafn_moveents(
+ xfs_da_args_t *args, /* operation arguments */
+ xfs_dabuf_t *bp_s, /* source leaf buffer */
+ int start_s, /* source leaf index */
+ xfs_dabuf_t *bp_d, /* destination leaf buffer */
+ int start_d, /* destination leaf index */
+ int count) /* count of leaves to copy */
+{
+ xfs_dir2_leaf_t *leaf_d; /* destination leaf structure */
+ xfs_dir2_leaf_t *leaf_s; /* source leaf structure */
+ int stale; /* count stale leaves copied */
+ xfs_trans_t *tp; /* transaction pointer */
+
+ xfs_dir2_trace_args_bibii("leafn_moveents", args, bp_s, start_s, bp_d,
+ start_d, count);
+ /*
+ * Silently return if nothing to do.
+ */
+ if (count == 0) {
+ return;
+ }
+ tp = args->trans;
+ leaf_s = bp_s->data;
+ leaf_d = bp_d->data;
+ /*
+ * If the destination index is not the end of the current
+ * destination leaf entries, open up a hole in the destination
+ * to hold the new entries.
+ */
+ if (start_d < INT_GET(leaf_d->hdr.count, ARCH_CONVERT)) {
+ memmove(&leaf_d->ents[start_d + count], &leaf_d->ents[start_d],
+ (INT_GET(leaf_d->hdr.count, ARCH_CONVERT) - start_d) *
+ sizeof(xfs_dir2_leaf_entry_t));
+ xfs_dir2_leaf_log_ents(tp, bp_d, start_d + count,
+ count + INT_GET(leaf_d->hdr.count, ARCH_CONVERT) - 1);
+ }
+ /*
+ * If the source has stale leaves, count the ones in the copy range
+ * so we can update the header correctly.
+ */
+ if (!INT_ISZERO(leaf_s->hdr.stale, ARCH_CONVERT)) {
+ int i; /* temp leaf index */
+
+ for (i = start_s, stale = 0; i < start_s + count; i++) {
+ if (INT_GET(leaf_s->ents[i].address, ARCH_CONVERT) == XFS_DIR2_NULL_DATAPTR)
+ stale++;
+ }
+ } else
+ stale = 0;
+ /*
+ * Copy the leaf entries from source to destination.
+ */
+ memcpy(&leaf_d->ents[start_d], &leaf_s->ents[start_s],
+ count * sizeof(xfs_dir2_leaf_entry_t));
+ xfs_dir2_leaf_log_ents(tp, bp_d, start_d, start_d + count - 1);
+ /*
+ * If there are source entries after the ones we copied,
+ * delete the ones we copied by sliding the next ones down.
+ */
+ if (start_s + count < INT_GET(leaf_s->hdr.count, ARCH_CONVERT)) {
+ memmove(&leaf_s->ents[start_s], &leaf_s->ents[start_s + count],
+ count * sizeof(xfs_dir2_leaf_entry_t));
+ xfs_dir2_leaf_log_ents(tp, bp_s, start_s, start_s + count - 1);
+ }
+ /*
+ * Update the headers and log them.
+ */
+ INT_MOD(leaf_s->hdr.count, ARCH_CONVERT, -(count));
+ INT_MOD(leaf_s->hdr.stale, ARCH_CONVERT, -(stale));
+ INT_MOD(leaf_d->hdr.count, ARCH_CONVERT, count);
+ INT_MOD(leaf_d->hdr.stale, ARCH_CONVERT, stale);
+ xfs_dir2_leaf_log_header(tp, bp_s);
+ xfs_dir2_leaf_log_header(tp, bp_d);
+ xfs_dir2_leafn_check(args->dp, bp_s);
+ xfs_dir2_leafn_check(args->dp, bp_d);
+}
+
+/*
+ * Determine the sort order of two leaf blocks.
+ * Returns 1 if both are valid and leaf2 should be before leaf1, else 0.
+ */
+int /* sort order */
+xfs_dir2_leafn_order(
+ xfs_dabuf_t *leaf1_bp, /* leaf1 buffer */
+ xfs_dabuf_t *leaf2_bp) /* leaf2 buffer */
+{
+ xfs_dir2_leaf_t *leaf1; /* leaf1 structure */
+ xfs_dir2_leaf_t *leaf2; /* leaf2 structure */
+
+ leaf1 = leaf1_bp->data;
+ leaf2 = leaf2_bp->data;
+ ASSERT(INT_GET(leaf1->hdr.info.magic, ARCH_CONVERT) == XFS_DIR2_LEAFN_MAGIC);
+ ASSERT(INT_GET(leaf2->hdr.info.magic, ARCH_CONVERT) == XFS_DIR2_LEAFN_MAGIC);
+ if (INT_GET(leaf1->hdr.count, ARCH_CONVERT) > 0 &&
+ INT_GET(leaf2->hdr.count, ARCH_CONVERT) > 0 &&
+ (INT_GET(leaf2->ents[0].hashval, ARCH_CONVERT) < INT_GET(leaf1->ents[0].hashval, ARCH_CONVERT) ||
+ INT_GET(leaf2->ents[INT_GET(leaf2->hdr.count, ARCH_CONVERT) - 1].hashval, ARCH_CONVERT) <
+ INT_GET(leaf1->ents[INT_GET(leaf1->hdr.count, ARCH_CONVERT) - 1].hashval, ARCH_CONVERT)))
+ return 1;
+ return 0;
+}
+
+/*
+ * Rebalance leaf entries between two leaf blocks.
+ * This is actually only called when the second block is new,
+ * though the code deals with the general case.
+ * A new entry will be inserted in one of the blocks, and that
+ * entry is taken into account when balancing.
+ */
+static void
+xfs_dir2_leafn_rebalance(
+ xfs_da_state_t *state, /* btree cursor */
+ xfs_da_state_blk_t *blk1, /* first btree block */
+ xfs_da_state_blk_t *blk2) /* second btree block */
+{
+ xfs_da_args_t *args; /* operation arguments */
+ int count; /* count (& direction) leaves */
+ int isleft; /* new goes in left leaf */
+ xfs_dir2_leaf_t *leaf1; /* first leaf structure */
+ xfs_dir2_leaf_t *leaf2; /* second leaf structure */
+ int mid; /* midpoint leaf index */
+#ifdef DEBUG
+ int oldstale; /* old count of stale leaves */
+#endif
+ int oldsum; /* old total leaf count */
+ int swap; /* swapped leaf blocks */
+
+ args = state->args;
+ /*
+ * If the block order is wrong, swap the arguments.
+ */
+ if ((swap = xfs_dir2_leafn_order(blk1->bp, blk2->bp))) {
+ xfs_da_state_blk_t *tmp; /* temp for block swap */
+
+ tmp = blk1;
+ blk1 = blk2;
+ blk2 = tmp;
+ }
+ leaf1 = blk1->bp->data;
+ leaf2 = blk2->bp->data;
+ oldsum = INT_GET(leaf1->hdr.count, ARCH_CONVERT) + INT_GET(leaf2->hdr.count, ARCH_CONVERT);
+#ifdef DEBUG
+ oldstale = INT_GET(leaf1->hdr.stale, ARCH_CONVERT) + INT_GET(leaf2->hdr.stale, ARCH_CONVERT);
+#endif
+ mid = oldsum >> 1;
+ /*
+ * If the old leaf count was odd then the new one will be even,
+ * so we need to divide the new count evenly.
+ */
+ if (oldsum & 1) {
+ xfs_dahash_t midhash; /* middle entry hash value */
+
+ if (mid >= INT_GET(leaf1->hdr.count, ARCH_CONVERT))
+ midhash = INT_GET(leaf2->ents[mid - INT_GET(leaf1->hdr.count, ARCH_CONVERT)].hashval, ARCH_CONVERT);
+ else
+ midhash = INT_GET(leaf1->ents[mid].hashval, ARCH_CONVERT);
+ isleft = args->hashval <= midhash;
+ }
+ /*
+ * If the old count is even then the new count is odd, so there's
+ * no preferred side for the new entry.
+ * Pick the left one.
+ */
+ else
+ isleft = 1;
+ /*
+ * Calculate moved entry count. Positive means left-to-right,
+ * negative means right-to-left. Then move the entries.
+ */
+ count = INT_GET(leaf1->hdr.count, ARCH_CONVERT) - mid + (isleft == 0);
+ if (count > 0)
+ xfs_dir2_leafn_moveents(args, blk1->bp,
+ INT_GET(leaf1->hdr.count, ARCH_CONVERT) - count, blk2->bp, 0, count);
+ else if (count < 0)
+ xfs_dir2_leafn_moveents(args, blk2->bp, 0, blk1->bp,
+ INT_GET(leaf1->hdr.count, ARCH_CONVERT), count);
+ ASSERT(INT_GET(leaf1->hdr.count, ARCH_CONVERT) + INT_GET(leaf2->hdr.count, ARCH_CONVERT) == oldsum);
+ ASSERT(INT_GET(leaf1->hdr.stale, ARCH_CONVERT) + INT_GET(leaf2->hdr.stale, ARCH_CONVERT) == oldstale);
+ /*
+ * Mark whether we're inserting into the old or new leaf.
+ */
+ if (INT_GET(leaf1->hdr.count, ARCH_CONVERT) < INT_GET(leaf2->hdr.count, ARCH_CONVERT))
+ state->inleaf = swap;
+ else if (INT_GET(leaf1->hdr.count, ARCH_CONVERT) > INT_GET(leaf2->hdr.count, ARCH_CONVERT))
+ state->inleaf = !swap;
+ else
+ state->inleaf =
+ swap ^ (args->hashval < INT_GET(leaf2->ents[0].hashval, ARCH_CONVERT));
+ /*
+ * Adjust the expected index for insertion.
+ */
+ if (!state->inleaf)
+ blk2->index = blk1->index - INT_GET(leaf1->hdr.count, ARCH_CONVERT);
+}
+
+/*
+ * Remove an entry from a node directory.
+ * This removes the leaf entry and the data entry,
+ * and updates the free block if necessary.
+ */
+static int /* error */
+xfs_dir2_leafn_remove(
+ xfs_da_args_t *args, /* operation arguments */
+ xfs_dabuf_t *bp, /* leaf buffer */
+ int index, /* leaf entry index */
+ xfs_da_state_blk_t *dblk, /* data block */
+ int *rval) /* resulting block needs join */
+{
+ 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 block entry */
+ xfs_inode_t *dp; /* incore directory inode */
+ xfs_dir2_leaf_t *leaf; /* leaf structure */
+ xfs_dir2_leaf_entry_t *lep; /* leaf entry */
+ int longest; /* longest data free entry */
+ int off; /* data block entry offset */
+ xfs_mount_t *mp; /* filesystem mount point */
+ int needlog; /* need to log data header */
+ int needscan; /* need to rescan data frees */
+ xfs_trans_t *tp; /* transaction pointer */
+
+ xfs_dir2_trace_args_sb("leafn_remove", args, index, bp);
+ dp = args->dp;
+ tp = args->trans;
+ mp = dp->i_mount;
+ leaf = bp->data;
+ ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR2_LEAFN_MAGIC);
+ /*
+ * Point to the entry we're removing.
+ */
+ lep = &leaf->ents[index];
+ /*
+ * Extract the data block and offset from the entry.
+ */
+ db = XFS_DIR2_DATAPTR_TO_DB(mp, INT_GET(lep->address, ARCH_CONVERT));
+ ASSERT(dblk->blkno == db);
+ off = XFS_DIR2_DATAPTR_TO_OFF(mp, INT_GET(lep->address, ARCH_CONVERT));
+ ASSERT(dblk->index == off);
+ /*
+ * Kill the leaf entry by marking it stale.
+ * Log the leaf block changes.
+ */
+ INT_MOD(leaf->hdr.stale, ARCH_CONVERT, +1);
+ xfs_dir2_leaf_log_header(tp, bp);
+ INT_SET(lep->address, ARCH_CONVERT, XFS_DIR2_NULL_DATAPTR);
+ xfs_dir2_leaf_log_ents(tp, bp, index, index);
+ /*
+ * Make the data entry free. Keep track of the longest freespace
+ * in the data block in case it changes.
+ */
+ dbp = dblk->bp;
+ data = dbp->data;
+ dep = (xfs_dir2_data_entry_t *)((char *)data + off);
+ longest = INT_GET(data->hdr.bestfree[0].length, ARCH_CONVERT);
+ needlog = needscan = 0;
+ xfs_dir2_data_make_free(tp, dbp, off,
+ XFS_DIR2_DATA_ENTSIZE(dep->namelen), &needlog, &needscan);
+ /*
+ * Rescan the data block freespaces for bestfree.
+ * Log the data block header if needed.
+ */
+ if (needscan)
+ xfs_dir2_data_freescan(mp, data, &needlog, NULL);
+ if (needlog)
+ xfs_dir2_data_log_header(tp, dbp);
+ xfs_dir2_data_check(dp, dbp);
+ /*
+ * If the longest data block freespace changes, need to update
+ * the corresponding freeblock entry.
+ */
+ if (longest < INT_GET(data->hdr.bestfree[0].length, ARCH_CONVERT)) {
+ int error; /* error return value */
+ xfs_dabuf_t *fbp; /* freeblock buffer */
+ xfs_dir2_db_t fdb; /* freeblock block number */
+ int findex; /* index in freeblock entries */
+ xfs_dir2_free_t *free; /* freeblock structure */
+ int logfree; /* need to log free entry */
+
+ /*
+ * Convert the data block number to a free block,
+ * read in the free block.
+ */
+ fdb = XFS_DIR2_DB_TO_FDB(mp, db);
+ if ((error = xfs_da_read_buf(tp, dp, XFS_DIR2_DB_TO_DA(mp, fdb),
+ -1, &fbp, XFS_DATA_FORK))) {
+ return error;
+ }
+ free = fbp->data;
+ ASSERT(INT_GET(free->hdr.magic, ARCH_CONVERT) == XFS_DIR2_FREE_MAGIC);
+ ASSERT(INT_GET(free->hdr.firstdb, ARCH_CONVERT) ==
+ XFS_DIR2_MAX_FREE_BESTS(mp) *
+ (fdb - XFS_DIR2_FREE_FIRSTDB(mp)));
+ /*
+ * Calculate which entry we need to fix.
+ */
+ findex = XFS_DIR2_DB_TO_FDINDEX(mp, db);
+ longest = INT_GET(data->hdr.bestfree[0].length, ARCH_CONVERT);
+ /*
+ * If the data block is now empty we can get rid of it
+ * (usually).
+ */
+ if (longest == mp->m_dirblksize - (uint)sizeof(data->hdr)) {
+ /*
+ * Try to punch out the data block.
+ */
+ error = xfs_dir2_shrink_inode(args, db, dbp);
+ if (error == 0) {
+ dblk->bp = NULL;
+ data = NULL;
+ }
+ /*
+ * We can get ENOSPC if there's no space reservation.
+ * In this case just drop the buffer and some one else
+ * will eventually get rid of the empty block.
+ */
+ else if (error == ENOSPC && args->total == 0)
+ xfs_da_buf_done(dbp);
+ else
+ return error;
+ }
+ /*
+ * If we got rid of the data block, we can eliminate that entry
+ * in the free block.
+ */
+ if (data == NULL) {
+ /*
+ * One less used entry in the free table.
+ */
+ INT_MOD(free->hdr.nused, ARCH_CONVERT, -1);
+ xfs_dir2_free_log_header(tp, fbp);
+ /*
+ * If this was the last entry in the table, we can
+ * trim the table size back. There might be other
+ * entries at the end referring to non-existent
+ * data blocks, get those too.
+ */
+ if (findex == INT_GET(free->hdr.nvalid, ARCH_CONVERT) - 1) {
+ int i; /* free entry index */
+
+ for (i = findex - 1;
+ i >= 0 && INT_GET(free->bests[i], ARCH_CONVERT) == NULLDATAOFF;
+ i--)
+ continue;
+ INT_SET(free->hdr.nvalid, ARCH_CONVERT, i + 1);
+ logfree = 0;
+ }
+ /*
+ * Not the last entry, just punch it out.
+ */
+ else {
+ INT_SET(free->bests[findex], ARCH_CONVERT, NULLDATAOFF);
+ logfree = 1;
+ }
+ /*
+ * If there are no useful entries left in the block,
+ * get rid of the block if we can.
+ */
+ if (INT_ISZERO(free->hdr.nused, ARCH_CONVERT)) {
+ error = xfs_dir2_shrink_inode(args, fdb, fbp);
+ if (error == 0) {
+ fbp = NULL;
+ logfree = 0;
+ } else if (error != ENOSPC || args->total != 0)
+ return error;
+ /*
+ * It's possible to get ENOSPC if there is no
+ * space reservation. In this case some one
+ * else will eventually get rid of this block.
+ */
+ }
+ }
+ /*
+ * Data block is not empty, just set the free entry to
+ * the new value.
+ */
+ else {
+ INT_SET(free->bests[findex], ARCH_CONVERT, longest);
+ logfree = 1;
+ }
+ /*
+ * Log the free entry that changed, unless we got rid of it.
+ */
+ if (logfree)
+ xfs_dir2_free_log_bests(tp, fbp, findex, findex);
+ /*
+ * Drop the buffer if we still have it.
+ */
+ if (fbp)
+ xfs_da_buf_done(fbp);
+ }
+ xfs_dir2_leafn_check(dp, bp);
+ /*
+ * Return indication of whether this leaf block is emtpy enough
+ * to justify trying to join it with a neighbor.
+ */
+ *rval =
+ ((uint)sizeof(leaf->hdr) +
+ (uint)sizeof(leaf->ents[0]) *
+ (INT_GET(leaf->hdr.count, ARCH_CONVERT) - INT_GET(leaf->hdr.stale, ARCH_CONVERT))) <
+ mp->m_dir_magicpct;
+ return 0;
+}
+
+/*
+ * Split the leaf entries in the old block into old and new blocks.
+ */
+int /* error */
+xfs_dir2_leafn_split(
+ xfs_da_state_t *state, /* btree cursor */
+ xfs_da_state_blk_t *oldblk, /* original block */
+ xfs_da_state_blk_t *newblk) /* newly created block */
+{
+ xfs_da_args_t *args; /* operation arguments */
+ xfs_dablk_t blkno; /* new leaf block number */
+ int error; /* error return value */
+ xfs_mount_t *mp; /* filesystem mount point */
+
+ /*
+ * Allocate space for a new leaf node.
+ */
+ args = state->args;
+ mp = args->dp->i_mount;
+ ASSERT(args != NULL);
+ ASSERT(oldblk->magic == XFS_DIR2_LEAFN_MAGIC);
+ error = xfs_da_grow_inode(args, &blkno);
+ if (error) {
+ return error;
+ }
+ /*
+ * Initialize the new leaf block.
+ */
+ error = xfs_dir2_leaf_init(args, XFS_DIR2_DA_TO_DB(mp, blkno),
+ &newblk->bp, XFS_DIR2_LEAFN_MAGIC);
+ if (error) {
+ return error;
+ }
+ newblk->blkno = blkno;
+ newblk->magic = XFS_DIR2_LEAFN_MAGIC;
+ /*
+ * Rebalance the entries across the two leaves, link the new
+ * block into the leaves.
+ */
+ xfs_dir2_leafn_rebalance(state, oldblk, newblk);
+ error = xfs_da_blk_link(state, oldblk, newblk);
+ if (error) {
+ return error;
+ }
+ /*
+ * Insert the new entry in the correct block.
+ */
+ if (state->inleaf)
+ error = xfs_dir2_leafn_add(oldblk->bp, args, oldblk->index);
+ else
+ error = xfs_dir2_leafn_add(newblk->bp, args, newblk->index);
+ /*
+ * Update last hashval in each block since we added the name.
+ */
+ oldblk->hashval = xfs_dir2_leafn_lasthash(oldblk->bp, NULL);
+ newblk->hashval = xfs_dir2_leafn_lasthash(newblk->bp, NULL);
+ xfs_dir2_leafn_check(args->dp, oldblk->bp);
+ xfs_dir2_leafn_check(args->dp, newblk->bp);
+ return error;
+}
+
+/*
+ * Check a leaf block and its neighbors to see if the block should be
+ * collapsed into one or the other neighbor. Always keep the block
+ * with the smaller block number.
+ * If the current block is over 50% full, don't try to join it, return 0.
+ * If the block is empty, fill in the state structure and return 2.
+ * If it can be collapsed, fill in the state structure and return 1.
+ * If nothing can be done, return 0.
+ */
+int /* error */
+xfs_dir2_leafn_toosmall(
+ xfs_da_state_t *state, /* btree cursor */
+ int *action) /* resulting action to take */
+{
+ xfs_da_state_blk_t *blk; /* leaf block */
+ xfs_dablk_t blkno; /* leaf block number */
+ xfs_dabuf_t *bp; /* leaf buffer */
+ int bytes; /* bytes in use */
+ int count; /* leaf live entry count */
+ int error; /* error return value */
+ int forward; /* sibling block direction */
+ int i; /* sibling counter */
+ xfs_da_blkinfo_t *info; /* leaf block header */
+ xfs_dir2_leaf_t *leaf; /* leaf structure */
+ int rval; /* result from path_shift */
+
+ /*
+ * Check for the degenerate case of the block being over 50% full.
+ * If so, it's not worth even looking to see if we might be able
+ * to coalesce with a sibling.
+ */
+ blk = &state->path.blk[state->path.active - 1];
+ info = blk->bp->data;
+ ASSERT(INT_GET(info->magic, ARCH_CONVERT) == XFS_DIR2_LEAFN_MAGIC);
+ leaf = (xfs_dir2_leaf_t *)info;
+ count = INT_GET(leaf->hdr.count, ARCH_CONVERT) - INT_GET(leaf->hdr.stale, ARCH_CONVERT);
+ bytes = (uint)sizeof(leaf->hdr) + count * (uint)sizeof(leaf->ents[0]);
+ if (bytes > (state->blocksize >> 1)) {
+ /*
+ * Blk over 50%, don't try to join.
+ */
+ *action = 0;
+ return 0;
+ }
+ /*
+ * Check for the degenerate case of the block being empty.
+ * If the block is empty, we'll simply delete it, no need to
+ * coalesce it with a sibling block. We choose (arbitrarily)
+ * to merge with the forward block unless it is NULL.
+ */
+ if (count == 0) {
+ /*
+ * Make altpath point to the block we want to keep and
+ * path point to the block we want to drop (this one).
+ */
+ forward = !INT_ISZERO(info->forw, ARCH_CONVERT);
+ memcpy(&state->altpath, &state->path, sizeof(state->path));
+ error = xfs_da_path_shift(state, &state->altpath, forward, 0,
+ &rval);
+ if (error)
+ return error;
+ *action = rval ? 2 : 0;
+ return 0;
+ }
+ /*
+ * Examine each sibling block to see if we can coalesce with
+ * at least 25% free space to spare. We need to figure out
+ * whether to merge with the forward or the backward block.
+ * We prefer coalescing with the lower numbered sibling so as
+ * to shrink a directory over time.
+ */
+ forward = INT_GET(info->forw, ARCH_CONVERT) < INT_GET(info->back, ARCH_CONVERT);
+ for (i = 0, bp = NULL; i < 2; forward = !forward, i++) {
+ blkno = forward ?INT_GET( info->forw, ARCH_CONVERT) : INT_GET(info->back, ARCH_CONVERT);
+ if (blkno == 0)
+ continue;
+ /*
+ * Read the sibling leaf block.
+ */
+ if ((error =
+ xfs_da_read_buf(state->args->trans, state->args->dp, blkno,
+ -1, &bp, XFS_DATA_FORK))) {
+ return error;
+ }
+ ASSERT(bp != NULL);
+ /*
+ * Count bytes in the two blocks combined.
+ */
+ leaf = (xfs_dir2_leaf_t *)info;
+ count = INT_GET(leaf->hdr.count, ARCH_CONVERT) - INT_GET(leaf->hdr.stale, ARCH_CONVERT);
+ bytes = state->blocksize - (state->blocksize >> 2);
+ leaf = bp->data;
+ ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR2_LEAFN_MAGIC);
+ count += INT_GET(leaf->hdr.count, ARCH_CONVERT) - INT_GET(leaf->hdr.stale, ARCH_CONVERT);
+ bytes -= count * (uint)sizeof(leaf->ents[0]);
+ /*
+ * Fits with at least 25% to spare.
+ */
+ if (bytes >= 0)
+ break;
+ xfs_da_brelse(state->args->trans, bp);
+ }
+ /*
+ * Didn't like either block, give up.
+ */
+ if (i >= 2) {
+ *action = 0;
+ return 0;
+ }
+ /*
+ * Done with the sibling leaf block here, drop the dabuf
+ * so path_shift can get it.
+ */
+ xfs_da_buf_done(bp);
+ /*
+ * Make altpath point to the block we want to keep (the lower
+ * numbered block) and path point to the block we want to drop.
+ */
+ memcpy(&state->altpath, &state->path, sizeof(state->path));
+ if (blkno < blk->blkno)
+ error = xfs_da_path_shift(state, &state->altpath, forward, 0,
+ &rval);
+ else
+ error = xfs_da_path_shift(state, &state->path, forward, 0,
+ &rval);
+ if (error) {
+ return error;
+ }
+ *action = rval ? 0 : 1;
+ return 0;
+}
+
+/*
+ * Move all the leaf entries from drop_blk to save_blk.
+ * This is done as part of a join operation.
+ */
+void
+xfs_dir2_leafn_unbalance(
+ xfs_da_state_t *state, /* cursor */
+ xfs_da_state_blk_t *drop_blk, /* dead block */
+ xfs_da_state_blk_t *save_blk) /* surviving block */
+{
+ xfs_da_args_t *args; /* operation arguments */
+ xfs_dir2_leaf_t *drop_leaf; /* dead leaf structure */
+ xfs_dir2_leaf_t *save_leaf; /* surviving leaf structure */
+
+ args = state->args;
+ ASSERT(drop_blk->magic == XFS_DIR2_LEAFN_MAGIC);
+ ASSERT(save_blk->magic == XFS_DIR2_LEAFN_MAGIC);
+ drop_leaf = drop_blk->bp->data;
+ save_leaf = save_blk->bp->data;
+ ASSERT(INT_GET(drop_leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR2_LEAFN_MAGIC);
+ ASSERT(INT_GET(save_leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR2_LEAFN_MAGIC);
+ /*
+ * If there are any stale leaf entries, take this opportunity
+ * to purge them.
+ */
+ if (INT_GET(drop_leaf->hdr.stale, ARCH_CONVERT))
+ xfs_dir2_leaf_compact(args, drop_blk->bp);
+ if (INT_GET(save_leaf->hdr.stale, ARCH_CONVERT))
+ xfs_dir2_leaf_compact(args, save_blk->bp);
+ /*
+ * Move the entries from drop to the appropriate end of save.
+ */
+ drop_blk->hashval = INT_GET(drop_leaf->ents[INT_GET(drop_leaf->hdr.count, ARCH_CONVERT) - 1].hashval, ARCH_CONVERT);
+ if (xfs_dir2_leafn_order(save_blk->bp, drop_blk->bp))
+ xfs_dir2_leafn_moveents(args, drop_blk->bp, 0, save_blk->bp, 0,
+ INT_GET(drop_leaf->hdr.count, ARCH_CONVERT));
+ else
+ xfs_dir2_leafn_moveents(args, drop_blk->bp, 0, save_blk->bp,
+ INT_GET(save_leaf->hdr.count, ARCH_CONVERT), INT_GET(drop_leaf->hdr.count, ARCH_CONVERT));
+ save_blk->hashval = INT_GET(save_leaf->ents[INT_GET(save_leaf->hdr.count, ARCH_CONVERT) - 1].hashval, ARCH_CONVERT);
+ xfs_dir2_leafn_check(args->dp, save_blk->bp);
+}
+
+/*
+ * Top-level node form directory addname routine.
+ */
+int /* error */
+xfs_dir2_node_addname(
+ xfs_da_args_t *args) /* operation arguments */
+{
+ xfs_da_state_blk_t *blk; /* leaf block for insert */
+ int error; /* error return value */
+ int rval; /* sub-return value */
+ xfs_da_state_t *state; /* btree cursor */
+
+ xfs_dir2_trace_args("node_addname", args);
+ /*
+ * Allocate and initialize the state (btree cursor).
+ */
+ state = xfs_da_state_alloc();
+ state->args = args;
+ state->mp = args->dp->i_mount;
+ state->blocksize = state->mp->m_dirblksize;
+ state->node_ents = state->mp->m_dir_node_ents;
+ /*
+ * Look up the name. We're not supposed to find it, but
+ * this gives us the insertion point.
+ */
+ error = xfs_da_node_lookup_int(state, &rval);
+ if (error)
+ rval = error;
+ if (rval != ENOENT) {
+ goto done;
+ }
+ /*
+ * Add the data entry to a data block.
+ * Extravalid is set to a freeblock found by lookup.
+ */
+ rval = xfs_dir2_node_addname_int(args,
+ state->extravalid ? &state->extrablk : NULL);
+ if (rval) {
+ goto done;
+ }
+ blk = &state->path.blk[state->path.active - 1];
+ ASSERT(blk->magic == XFS_DIR2_LEAFN_MAGIC);
+ /*
+ * Add the new leaf entry.
+ */
+ rval = xfs_dir2_leafn_add(blk->bp, args, blk->index);
+ if (rval == 0) {
+ /*
+ * It worked, fix the hash values up the btree.
+ */
+ if (!args->justcheck)
+ xfs_da_fixhashpath(state, &state->path);
+ } else {
+ /*
+ * It didn't work, we need to split the leaf block.
+ */
+ if (args->total == 0) {
+ ASSERT(rval == ENOSPC);
+ goto done;
+ }
+ /*
+ * Split the leaf block and insert the new entry.
+ */
+ rval = xfs_da_split(state);
+ }
+done:
+ xfs_da_state_free(state);
+ return rval;
+}
+
+/*
+ * Add the data entry for a node-format directory name addition.
+ * The leaf entry is added in xfs_dir2_leafn_add.
+ * We may enter with a freespace block that the lookup found.
+ */
+static int /* error */
+xfs_dir2_node_addname_int(
+ xfs_da_args_t *args, /* operation arguments */
+ xfs_da_state_blk_t *fblk) /* optional freespace block */
+{
+ xfs_dir2_data_t *data; /* data block structure */
+ xfs_dir2_db_t dbno; /* data block number */
+ xfs_dabuf_t *dbp; /* data block buffer */
+ xfs_dir2_data_entry_t *dep; /* data entry pointer */
+ xfs_inode_t *dp; /* incore directory inode */
+ xfs_dir2_data_unused_t *dup; /* data unused entry pointer */
+ int error; /* error return value */
+ xfs_dir2_db_t fbno; /* freespace block number */
+ xfs_dabuf_t *fbp; /* freespace buffer */
+ int findex; /* freespace entry index */
+ xfs_dir2_free_t *free=NULL; /* freespace block structure */
+ xfs_dir2_db_t ifbno; /* initial freespace block no */
+ xfs_dir2_db_t lastfbno=0; /* highest freespace block no */
+ int length; /* length of the new entry */
+ int logfree; /* need to log free entry */
+ 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 *tagp; /* data entry tag pointer */
+ xfs_trans_t *tp; /* transaction pointer */
+
+ dp = args->dp;
+ mp = dp->i_mount;
+ tp = args->trans;
+ length = XFS_DIR2_DATA_ENTSIZE(args->namelen);
+ /*
+ * If we came in with a freespace block that means that lookup
+ * found an entry with our hash value. This is the freespace
+ * block for that data entry.
+ */
+ if (fblk) {
+ fbp = fblk->bp;
+ /*
+ * Remember initial freespace block number.
+ */
+ ifbno = fblk->blkno;
+ free = fbp->data;
+ ASSERT(INT_GET(free->hdr.magic, ARCH_CONVERT) == XFS_DIR2_FREE_MAGIC);
+ findex = fblk->index;
+ /*
+ * This means the free entry showed that the data block had
+ * space for our entry, so we remembered it.
+ * Use that data block.
+ */
+ if (findex >= 0) {
+ ASSERT(findex < INT_GET(free->hdr.nvalid, ARCH_CONVERT));
+ ASSERT(INT_GET(free->bests[findex], ARCH_CONVERT) != NULLDATAOFF);
+ ASSERT(INT_GET(free->bests[findex], ARCH_CONVERT) >= length);
+ dbno = INT_GET(free->hdr.firstdb, ARCH_CONVERT) + findex;
+ }
+ /*
+ * The data block looked at didn't have enough room.
+ * We'll start at the beginning of the freespace entries.
+ */
+ else {
+ dbno = -1;
+ findex = 0;
+ }
+ }
+ /*
+ * Didn't come in with a freespace block, so don't have a data block.
+ */
+ else {
+ ifbno = dbno = -1;
+ fbp = NULL;
+ findex = 0;
+ }
+ /*
+ * If we don't have a data block yet, we're going to scan the
+ * freespace blocks looking for one. Figure out what the
+ * highest freespace block number is.
+ */
+ if (dbno == -1) {
+ xfs_fileoff_t fo; /* freespace block number */
+
+ if ((error = xfs_bmap_last_offset(tp, dp, &fo, XFS_DATA_FORK)))
+ return error;
+ lastfbno = XFS_DIR2_DA_TO_DB(mp, (xfs_dablk_t)fo);
+ fbno = ifbno;
+ }
+ /*
+ * While we haven't identified a data block, search the freeblock
+ * data for a good data block. If we find a null freeblock entry,
+ * indicating a hole in the data blocks, remember that.
+ */
+ while (dbno == -1) {
+ /*
+ * If we don't have a freeblock in hand, get the next one.
+ */
+ if (fbp == NULL) {
+ /*
+ * Happens the first time through unless lookup gave
+ * us a freespace block to start with.
+ */
+ if (++fbno == 0)
+ fbno = XFS_DIR2_FREE_FIRSTDB(mp);
+ /*
+ * If it's ifbno we already looked at it.
+ */
+ if (fbno == ifbno)
+ fbno++;
+ /*
+ * If it's off the end we're done.
+ */
+ if (fbno >= lastfbno)
+ break;
+ /*
+ * Read the block. There can be holes in the
+ * freespace blocks, so this might not succeed.
+ * This should be really rare, so there's no reason
+ * to avoid it.
+ */
+ if ((error = xfs_da_read_buf(tp, dp,
+ XFS_DIR2_DB_TO_DA(mp, fbno), -2, &fbp,
+ XFS_DATA_FORK))) {
+ return error;
+ }
+ if (unlikely(fbp == NULL)) {
+ continue;
+ }
+ free = fbp->data;
+ ASSERT(INT_GET(free->hdr.magic, ARCH_CONVERT) == XFS_DIR2_FREE_MAGIC);
+ findex = 0;
+ }
+ /*
+ * Look at the current free entry. Is it good enough?
+ */
+ if (INT_GET(free->bests[findex], ARCH_CONVERT) != NULLDATAOFF &&
+ INT_GET(free->bests[findex], ARCH_CONVERT) >= length)
+ dbno = INT_GET(free->hdr.firstdb, ARCH_CONVERT) + findex;
+ else {
+ /*
+ * Are we done with the freeblock?
+ */
+ if (++findex == INT_GET(free->hdr.nvalid, ARCH_CONVERT)) {
+ /*
+ * Drop the block.
+ */
+ xfs_da_brelse(tp, fbp);
+ fbp = NULL;
+ if (fblk && fblk->bp)
+ fblk->bp = NULL;
+ }
+ }
+ }
+ /*
+ * If we don't have a data block, we need to allocate one and make
+ * the freespace entries refer to it.
+ */
+ if (unlikely(dbno == -1)) {
+ /*
+ * Not allowed to allocate, return failure.
+ */
+ if (args->justcheck || args->total == 0) {
+ /*
+ * Drop the freespace buffer unless it came from our
+ * caller.
+ */
+ if ((fblk == NULL || fblk->bp == NULL) && fbp != NULL)
+ xfs_da_buf_done(fbp);
+ return XFS_ERROR(ENOSPC);
+ }
+ /*
+ * Allocate and initialize the new data block.
+ */
+ if (unlikely((error = xfs_dir2_grow_inode(args,
+ XFS_DIR2_DATA_SPACE,
+ &dbno)) ||
+ (error = xfs_dir2_data_init(args, dbno, &dbp)))) {
+ /*
+ * Drop the freespace buffer unless it came from our
+ * caller.
+ */
+ if ((fblk == NULL || fblk->bp == NULL) && fbp != NULL)
+ xfs_da_buf_done(fbp);
+ return error;
+ }
+ /*
+ * If (somehow) we have a freespace block, get rid of it.
+ */
+ if (fbp)
+ xfs_da_brelse(tp, fbp);
+ if (fblk && fblk->bp)
+ fblk->bp = NULL;
+
+ /*
+ * Get the freespace block corresponding to the data block
+ * that was just allocated.
+ */
+ fbno = XFS_DIR2_DB_TO_FDB(mp, dbno);
+ if (unlikely(error = xfs_da_read_buf(tp, dp,
+ XFS_DIR2_DB_TO_DA(mp, fbno), -2, &fbp,
+ XFS_DATA_FORK))) {
+ xfs_da_buf_done(dbp);
+ return error;
+ }
+ /*
+ * If there wasn't a freespace block, the read will
+ * return a NULL fbp. Allocate and initialize a new one.
+ */
+ if( fbp == NULL ) {
+ if ((error = xfs_dir2_grow_inode(args, XFS_DIR2_FREE_SPACE,
+ &fbno))) {
+ return error;
+ }
+
+ if (unlikely(XFS_DIR2_DB_TO_FDB(mp, dbno) != fbno)) {
+ cmn_err(CE_ALERT,
+ "xfs_dir2_node_addname_int: dir ino "
+ "%llu needed freesp block %lld for\n"
+ " data block %lld, got %lld\n"
+ " ifbno %llu lastfbno %d\n",
+ dp->i_ino,
+ XFS_DIR2_DB_TO_FDB(mp, dbno),
+ dbno, fbno,
+ ifbno, lastfbno);
+ if (fblk) {
+ cmn_err(CE_ALERT,
+ " fblk 0x%llu blkno %llu "
+ "index %d magic 0x%x\n",
+ fblk, fblk->blkno,
+ fblk->index,
+ fblk->magic);
+ } else {
+ cmn_err(CE_ALERT,
+ " ... fblk is NULL\n");
+ }
+ XFS_ERROR_REPORT("xfs_dir2_node_addname_int",
+ XFS_ERRLEVEL_LOW, mp);
+ return XFS_ERROR(EFSCORRUPTED);
+ }
+
+ /*
+ * Get a buffer for the new block.
+ */
+ if ((error = xfs_da_get_buf(tp, dp,
+ XFS_DIR2_DB_TO_DA(mp, fbno),
+ -1, &fbp, XFS_DATA_FORK))) {
+ return error;
+ }
+ ASSERT(fbp != NULL);
+
+ /*
+ * Initialize the new block to be empty, and remember
+ * its first slot as our empty slot.
+ */
+ free = fbp->data;
+ INT_SET(free->hdr.magic, ARCH_CONVERT, XFS_DIR2_FREE_MAGIC);
+ INT_SET(free->hdr.firstdb, ARCH_CONVERT,
+ (fbno - XFS_DIR2_FREE_FIRSTDB(mp)) *
+ XFS_DIR2_MAX_FREE_BESTS(mp));
+ INT_ZERO(free->hdr.nvalid, ARCH_CONVERT);
+ INT_ZERO(free->hdr.nused, ARCH_CONVERT);
+ } else {
+ free = fbp->data;
+ ASSERT(INT_GET(free->hdr.magic, ARCH_CONVERT) == XFS_DIR2_FREE_MAGIC);
+ }
+
+ /*
+ * Set the freespace block index from the data block number.
+ */
+ findex = XFS_DIR2_DB_TO_FDINDEX(mp, dbno);
+ /*
+ * If it's after the end of the current entries in the
+ * freespace block, extend that table.
+ */
+ if (findex >= INT_GET(free->hdr.nvalid, ARCH_CONVERT)) {
+ ASSERT(findex < XFS_DIR2_MAX_FREE_BESTS(mp));
+ INT_SET(free->hdr.nvalid, ARCH_CONVERT, findex + 1);
+ /*
+ * Tag new entry so nused will go up.
+ */
+ INT_SET(free->bests[findex], ARCH_CONVERT, NULLDATAOFF);
+ }
+ /*
+ * If this entry was for an empty data block
+ * (this should always be true) then update the header.
+ */
+ if (INT_GET(free->bests[findex], ARCH_CONVERT) == NULLDATAOFF) {
+ INT_MOD(free->hdr.nused, ARCH_CONVERT, +1);
+ xfs_dir2_free_log_header(tp, fbp);
+ }
+ /*
+ * Update the real value in the table.
+ * We haven't allocated the data entry yet so this will
+ * change again.
+ */
+ data = dbp->data;
+ INT_COPY(free->bests[findex], data->hdr.bestfree[0].length, ARCH_CONVERT);
+ logfree = 1;
+ }
+ /*
+ * We had a data block so we don't have to make a new one.
+ */
+ else {
+ /*
+ * If just checking, we succeeded.
+ */
+ if (args->justcheck) {
+ if ((fblk == NULL || fblk->bp == NULL) && fbp != NULL)
+ xfs_da_buf_done(fbp);
+ return 0;
+ }
+ /*
+ * Read the data block in.
+ */
+ if (unlikely(
+ error = xfs_da_read_buf(tp, dp, XFS_DIR2_DB_TO_DA(mp, dbno),
+ -1, &dbp, XFS_DATA_FORK))) {
+ if ((fblk == NULL || fblk->bp == NULL) && fbp != NULL)
+ xfs_da_buf_done(fbp);
+ return error;
+ }
+ data = dbp->data;
+ logfree = 0;
+ }
+ ASSERT(INT_GET(data->hdr.bestfree[0].length, ARCH_CONVERT) >= length);
+ /*
+ * Point to the existing unused space.
+ */
+ dup = (xfs_dir2_data_unused_t *)
+ ((char *)data + INT_GET(data->hdr.bestfree[0].offset, ARCH_CONVERT));
+ needscan = needlog = 0;
+ /*
+ * Mark the first part of the unused space, inuse for us.
+ */
+ xfs_dir2_data_use_free(tp, dbp, dup,
+ (xfs_dir2_data_aoff_t)((char *)dup - (char *)data), length,
+ &needlog, &needscan);
+ /*
+ * Fill in the new entry and log it.
+ */
+ 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));
+ xfs_dir2_data_log_entry(tp, dbp, dep);
+ /*
+ * Rescan the block for bestfree if needed.
+ */
+ if (needscan)
+ xfs_dir2_data_freescan(mp, data, &needlog, NULL);
+ /*
+ * Log the data block header if needed.
+ */
+ if (needlog)
+ xfs_dir2_data_log_header(tp, dbp);
+ /*
+ * If the freespace entry is now wrong, update it.
+ */
+ if (INT_GET(free->bests[findex], ARCH_CONVERT) != INT_GET(data->hdr.bestfree[0].length, ARCH_CONVERT)) {
+ INT_COPY(free->bests[findex], data->hdr.bestfree[0].length, ARCH_CONVERT);
+ logfree = 1;
+ }
+ /*
+ * Log the freespace entry if needed.
+ */
+ if (logfree)
+ xfs_dir2_free_log_bests(tp, fbp, findex, findex);
+ /*
+ * If the caller didn't hand us the freespace block, drop it.
+ */
+ if ((fblk == NULL || fblk->bp == NULL) && fbp != NULL)
+ xfs_da_buf_done(fbp);
+ /*
+ * Return the data block and offset in args, then drop the data block.
+ */
+ args->blkno = (xfs_dablk_t)dbno;
+ args->index = INT_GET(*tagp, ARCH_CONVERT);
+ xfs_da_buf_done(dbp);
+ return 0;
+}
+
+/*
+ * Lookup an entry in a node-format directory.
+ * All the real work happens in xfs_da_node_lookup_int.
+ * The only real output is the inode number of the entry.
+ */
+int /* error */
+xfs_dir2_node_lookup(
+ xfs_da_args_t *args) /* operation arguments */
+{
+ int error; /* error return value */
+ int i; /* btree level */
+ int rval; /* operation return value */
+ xfs_da_state_t *state; /* btree cursor */
+
+ xfs_dir2_trace_args("node_lookup", args);
+ /*
+ * Allocate and initialize the btree cursor.
+ */
+ state = xfs_da_state_alloc();
+ state->args = args;
+ state->mp = args->dp->i_mount;
+ state->blocksize = state->mp->m_dirblksize;
+ state->node_ents = state->mp->m_dir_node_ents;
+ /*
+ * Fill in the path to the entry in the cursor.
+ */
+ error = xfs_da_node_lookup_int(state, &rval);
+ if (error)
+ rval = error;
+ /*
+ * Release the btree blocks and leaf block.
+ */
+ for (i = 0; i < state->path.active; i++) {
+ xfs_da_brelse(args->trans, state->path.blk[i].bp);
+ state->path.blk[i].bp = NULL;
+ }
+ /*
+ * Release the data block if we have it.
+ */
+ if (state->extravalid && state->extrablk.bp) {
+ xfs_da_brelse(args->trans, state->extrablk.bp);
+ state->extrablk.bp = NULL;
+ }
+ xfs_da_state_free(state);
+ return rval;
+}
+
+/*
+ * Remove an entry from a node-format directory.
+ */
+int /* error */
+xfs_dir2_node_removename(
+ xfs_da_args_t *args) /* operation arguments */
+{
+ xfs_da_state_blk_t *blk; /* leaf block */
+ int error; /* error return value */
+ int rval; /* operation return value */
+ xfs_da_state_t *state; /* btree cursor */
+
+ xfs_dir2_trace_args("node_removename", args);
+ /*
+ * Allocate and initialize the btree cursor.
+ */
+ state = xfs_da_state_alloc();
+ state->args = args;
+ state->mp = args->dp->i_mount;
+ state->blocksize = state->mp->m_dirblksize;
+ state->node_ents = state->mp->m_dir_node_ents;
+ /*
+ * Look up the entry we're deleting, set up the cursor.
+ */
+ error = xfs_da_node_lookup_int(state, &rval);
+ if (error) {
+ rval = error;
+ }
+ /*
+ * Didn't find it, upper layer screwed up.
+ */
+ if (rval != EEXIST) {
+ xfs_da_state_free(state);
+ return rval;
+ }
+ blk = &state->path.blk[state->path.active - 1];
+ ASSERT(blk->magic == XFS_DIR2_LEAFN_MAGIC);
+ ASSERT(state->extravalid);
+ /*
+ * Remove the leaf and data entries.
+ * Extrablk refers to the data block.
+ */
+ error = xfs_dir2_leafn_remove(args, blk->bp, blk->index,
+ &state->extrablk, &rval);
+ if (error) {
+ return error;
+ }
+ /*
+ * Fix the hash values up the btree.
+ */
+ xfs_da_fixhashpath(state, &state->path);
+ /*
+ * If we need to join leaf blocks, do it.
+ */
+ if (rval && state->path.active > 1)
+ error = xfs_da_join(state);
+ /*
+ * If no errors so far, try conversion to leaf format.
+ */
+ if (!error)
+ error = xfs_dir2_node_to_leaf(state);
+ xfs_da_state_free(state);
+ return error;
+}
+
+/*
+ * Replace an entry's inode number in a node-format directory.
+ */
+int /* error */
+xfs_dir2_node_replace(
+ xfs_da_args_t *args) /* operation arguments */
+{
+ xfs_da_state_blk_t *blk; /* leaf block */
+ xfs_dir2_data_t *data; /* data block structure */
+ xfs_dir2_data_entry_t *dep; /* data entry changed */
+ int error; /* error return value */
+ int i; /* btree level */
+ xfs_ino_t inum; /* new inode number */
+ xfs_dir2_leaf_t *leaf; /* leaf structure */
+ xfs_dir2_leaf_entry_t *lep; /* leaf entry being changed */
+ int rval; /* internal return value */
+ xfs_da_state_t *state; /* btree cursor */
+
+ xfs_dir2_trace_args("node_replace", args);
+ /*
+ * Allocate and initialize the btree cursor.
+ */
+ state = xfs_da_state_alloc();
+ state->args = args;
+ state->mp = args->dp->i_mount;
+ state->blocksize = state->mp->m_dirblksize;
+ state->node_ents = state->mp->m_dir_node_ents;
+ inum = args->inumber;
+ /*
+ * Lookup the entry to change in the btree.
+ */
+ error = xfs_da_node_lookup_int(state, &rval);
+ if (error) {
+ rval = error;
+ }
+ /*
+ * It should be found, since the vnodeops layer has looked it up
+ * and locked it. But paranoia is good.
+ */
+ if (rval == EEXIST) {
+ /*
+ * Find the leaf entry.
+ */
+ blk = &state->path.blk[state->path.active - 1];
+ ASSERT(blk->magic == XFS_DIR2_LEAFN_MAGIC);
+ leaf = blk->bp->data;
+ lep = &leaf->ents[blk->index];
+ ASSERT(state->extravalid);
+ /*
+ * Point to the data entry.
+ */
+ data = state->extrablk.bp->data;
+ ASSERT(INT_GET(data->hdr.magic, ARCH_CONVERT) == XFS_DIR2_DATA_MAGIC);
+ dep = (xfs_dir2_data_entry_t *)
+ ((char *)data +
+ XFS_DIR2_DATAPTR_TO_OFF(state->mp, INT_GET(lep->address, ARCH_CONVERT)));
+ ASSERT(inum != INT_GET(dep->inumber, ARCH_CONVERT));
+ /*
+ * Fill in the new inode number and log the entry.
+ */
+ INT_SET(dep->inumber, ARCH_CONVERT, inum);
+ xfs_dir2_data_log_entry(args->trans, state->extrablk.bp, dep);
+ rval = 0;
+ }
+ /*
+ * Didn't find it, and we're holding a data block. Drop it.
+ */
+ else if (state->extravalid) {
+ xfs_da_brelse(args->trans, state->extrablk.bp);
+ state->extrablk.bp = NULL;
+ }
+ /*
+ * Release all the buffers in the cursor.
+ */
+ for (i = 0; i < state->path.active; i++) {
+ xfs_da_brelse(args->trans, state->path.blk[i].bp);
+ state->path.blk[i].bp = NULL;
+ }
+ xfs_da_state_free(state);
+ return rval;
+}
+
+/*
+ * Trim off a trailing empty freespace block.
+ * Return (in rvalp) 1 if we did it, 0 if not.
+ */
+int /* error */
+xfs_dir2_node_trim_free(
+ xfs_da_args_t *args, /* operation arguments */
+ xfs_fileoff_t fo, /* free block number */
+ int *rvalp) /* out: did something */
+{
+ xfs_dabuf_t *bp; /* freespace buffer */
+ xfs_inode_t *dp; /* incore directory inode */
+ int error; /* error return code */
+ xfs_dir2_free_t *free; /* freespace 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 freespace block.
+ */
+ if (unlikely(error = xfs_da_read_buf(tp, dp, (xfs_dablk_t)fo, -2, &bp,
+ XFS_DATA_FORK))) {
+ return error;
+ }
+
+ /*
+ * There can be holes in freespace. If fo is a hole, there's
+ * nothing to do.
+ */
+ if (bp == NULL) {
+ return 0;
+ }
+ free = bp->data;
+ ASSERT(INT_GET(free->hdr.magic, ARCH_CONVERT) == XFS_DIR2_FREE_MAGIC);
+ /*
+ * If there are used entries, there's nothing to do.
+ */
+ if (INT_GET(free->hdr.nused, ARCH_CONVERT) > 0) {
+ xfs_da_brelse(tp, bp);
+ *rvalp = 0;
+ return 0;
+ }
+ /*
+ * Blow the block away.
+ */
+ if ((error =
+ xfs_dir2_shrink_inode(args, XFS_DIR2_DA_TO_DB(mp, (xfs_dablk_t)fo),
+ bp))) {
+ /*
+ * Can't fail with ENOSPC since that only happens with no
+ * space reservation, when breaking up an extent into two
+ * pieces. This is the last block of an extent.
+ */
+ ASSERT(error != ENOSPC);
+ xfs_da_brelse(tp, bp);
+ return error;
+ }
+ /*
+ * Return that we succeeded.
+ */
+ *rvalp = 1;
+ return 0;
+}
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)