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-rw-r--r--fs/xfs/xfs_dir_leaf.c2231
1 files changed, 2231 insertions, 0 deletions
diff --git a/fs/xfs/xfs_dir_leaf.c b/fs/xfs/xfs_dir_leaf.c
new file mode 100644
index 00000000000..617018d6bbd
--- /dev/null
+++ b/fs/xfs/xfs_dir_leaf.c
@@ -0,0 +1,2231 @@
+/*
+ * 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_dir_leaf.c
+ *
+ * GROT: figure out how to recover gracefully when bmap returns ENOSPC.
+ */
+
+#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_alloc_btree.h"
+#include "xfs_bmap_btree.h"
+#include "xfs_ialloc_btree.h"
+#include "xfs_alloc.h"
+#include "xfs_btree.h"
+#include "xfs_attr_sf.h"
+#include "xfs_dir_sf.h"
+#include "xfs_dir2_sf.h"
+#include "xfs_dinode.h"
+#include "xfs_inode_item.h"
+#include "xfs_inode.h"
+#include "xfs_bmap.h"
+#include "xfs_da_btree.h"
+#include "xfs_dir_leaf.h"
+#include "xfs_error.h"
+
+/*
+ * xfs_dir_leaf.c
+ *
+ * Routines to implement leaf blocks of directories as Btrees of hashed names.
+ */
+
+/*========================================================================
+ * Function prototypes for the kernel.
+ *========================================================================*/
+
+/*
+ * Routines used for growing the Btree.
+ */
+STATIC void xfs_dir_leaf_add_work(xfs_dabuf_t *leaf_buffer, xfs_da_args_t *args,
+ int insertion_index,
+ int freemap_index);
+STATIC int xfs_dir_leaf_compact(xfs_trans_t *trans, xfs_dabuf_t *leaf_buffer,
+ int musthave, int justcheck);
+STATIC void xfs_dir_leaf_rebalance(xfs_da_state_t *state,
+ xfs_da_state_blk_t *blk1,
+ xfs_da_state_blk_t *blk2);
+STATIC int xfs_dir_leaf_figure_balance(xfs_da_state_t *state,
+ xfs_da_state_blk_t *leaf_blk_1,
+ xfs_da_state_blk_t *leaf_blk_2,
+ int *number_entries_in_blk1,
+ int *number_namebytes_in_blk1);
+
+/*
+ * Utility routines.
+ */
+STATIC void xfs_dir_leaf_moveents(xfs_dir_leafblock_t *src_leaf,
+ int src_start,
+ xfs_dir_leafblock_t *dst_leaf,
+ int dst_start, int move_count,
+ xfs_mount_t *mp);
+
+
+/*========================================================================
+ * External routines when dirsize < XFS_IFORK_DSIZE(dp).
+ *========================================================================*/
+
+
+/*
+ * Validate a given inode number.
+ */
+int
+xfs_dir_ino_validate(xfs_mount_t *mp, xfs_ino_t ino)
+{
+ xfs_agblock_t agblkno;
+ xfs_agino_t agino;
+ xfs_agnumber_t agno;
+ int ino_ok;
+ int ioff;
+
+ agno = XFS_INO_TO_AGNO(mp, ino);
+ agblkno = XFS_INO_TO_AGBNO(mp, ino);
+ ioff = XFS_INO_TO_OFFSET(mp, ino);
+ agino = XFS_OFFBNO_TO_AGINO(mp, agblkno, ioff);
+ ino_ok =
+ agno < mp->m_sb.sb_agcount &&
+ agblkno < mp->m_sb.sb_agblocks &&
+ agblkno != 0 &&
+ ioff < (1 << mp->m_sb.sb_inopblog) &&
+ XFS_AGINO_TO_INO(mp, agno, agino) == ino;
+ if (unlikely(XFS_TEST_ERROR(!ino_ok, mp, XFS_ERRTAG_DIR_INO_VALIDATE,
+ XFS_RANDOM_DIR_INO_VALIDATE))) {
+ xfs_fs_cmn_err(CE_WARN, mp, "Invalid inode number 0x%Lx",
+ (unsigned long long) ino);
+ XFS_ERROR_REPORT("xfs_dir_ino_validate", XFS_ERRLEVEL_LOW, mp);
+ return XFS_ERROR(EFSCORRUPTED);
+ }
+ return 0;
+}
+
+/*
+ * Create the initial contents of a shortform directory.
+ */
+int
+xfs_dir_shortform_create(xfs_da_args_t *args, xfs_ino_t parent)
+{
+ xfs_dir_sf_hdr_t *hdr;
+ xfs_inode_t *dp;
+
+ dp = args->dp;
+ ASSERT(dp != NULL);
+ ASSERT(dp->i_d.di_size == 0);
+ if (dp->i_d.di_format == XFS_DINODE_FMT_EXTENTS) {
+ dp->i_df.if_flags &= ~XFS_IFEXTENTS; /* just in case */
+ dp->i_d.di_format = XFS_DINODE_FMT_LOCAL;
+ xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE);
+ dp->i_df.if_flags |= XFS_IFINLINE;
+ }
+ ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
+ ASSERT(dp->i_df.if_bytes == 0);
+ xfs_idata_realloc(dp, sizeof(*hdr), XFS_DATA_FORK);
+ hdr = (xfs_dir_sf_hdr_t *)dp->i_df.if_u1.if_data;
+ XFS_DIR_SF_PUT_DIRINO(&parent, &hdr->parent);
+
+ hdr->count = 0;
+ dp->i_d.di_size = sizeof(*hdr);
+ xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
+ return(0);
+}
+
+/*
+ * Add a name to the shortform directory structure.
+ * Overflow from the inode has already been checked for.
+ */
+int
+xfs_dir_shortform_addname(xfs_da_args_t *args)
+{
+ xfs_dir_shortform_t *sf;
+ xfs_dir_sf_entry_t *sfe;
+ int i, offset, size;
+ xfs_inode_t *dp;
+
+ dp = args->dp;
+ ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
+ /*
+ * Catch the case where the conversion from shortform to leaf
+ * failed part way through.
+ */
+ if (dp->i_d.di_size < sizeof(xfs_dir_sf_hdr_t)) {
+ ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
+ return XFS_ERROR(EIO);
+ }
+ ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
+ ASSERT(dp->i_df.if_u1.if_data != NULL);
+ sf = (xfs_dir_shortform_t *)dp->i_df.if_u1.if_data;
+ sfe = &sf->list[0];
+ for (i = INT_GET(sf->hdr.count, ARCH_CONVERT)-1; i >= 0; i--) {
+ if (sfe->namelen == args->namelen &&
+ args->name[0] == sfe->name[0] &&
+ memcmp(args->name, sfe->name, args->namelen) == 0)
+ return(XFS_ERROR(EEXIST));
+ sfe = XFS_DIR_SF_NEXTENTRY(sfe);
+ }
+
+ offset = (int)((char *)sfe - (char *)sf);
+ size = XFS_DIR_SF_ENTSIZE_BYNAME(args->namelen);
+ xfs_idata_realloc(dp, size, XFS_DATA_FORK);
+ sf = (xfs_dir_shortform_t *)dp->i_df.if_u1.if_data;
+ sfe = (xfs_dir_sf_entry_t *)((char *)sf + offset);
+
+ XFS_DIR_SF_PUT_DIRINO(&args->inumber, &sfe->inumber);
+ sfe->namelen = args->namelen;
+ memcpy(sfe->name, args->name, sfe->namelen);
+ INT_MOD(sf->hdr.count, ARCH_CONVERT, +1);
+
+ dp->i_d.di_size += size;
+ xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
+
+ return(0);
+}
+
+/*
+ * Remove a name from the shortform directory structure.
+ */
+int
+xfs_dir_shortform_removename(xfs_da_args_t *args)
+{
+ xfs_dir_shortform_t *sf;
+ xfs_dir_sf_entry_t *sfe;
+ int base, size = 0, i;
+ xfs_inode_t *dp;
+
+ dp = args->dp;
+ ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
+ /*
+ * Catch the case where the conversion from shortform to leaf
+ * failed part way through.
+ */
+ if (dp->i_d.di_size < sizeof(xfs_dir_sf_hdr_t)) {
+ ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
+ return XFS_ERROR(EIO);
+ }
+ ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
+ ASSERT(dp->i_df.if_u1.if_data != NULL);
+ base = sizeof(xfs_dir_sf_hdr_t);
+ sf = (xfs_dir_shortform_t *)dp->i_df.if_u1.if_data;
+ sfe = &sf->list[0];
+ for (i = INT_GET(sf->hdr.count, ARCH_CONVERT)-1; i >= 0; i--) {
+ size = XFS_DIR_SF_ENTSIZE_BYENTRY(sfe);
+ if (sfe->namelen == args->namelen &&
+ sfe->name[0] == args->name[0] &&
+ memcmp(sfe->name, args->name, args->namelen) == 0)
+ break;
+ base += size;
+ sfe = XFS_DIR_SF_NEXTENTRY(sfe);
+ }
+ if (i < 0) {
+ ASSERT(args->oknoent);
+ return(XFS_ERROR(ENOENT));
+ }
+
+ if ((base + size) != dp->i_d.di_size) {
+ memmove(&((char *)sf)[base], &((char *)sf)[base+size],
+ dp->i_d.di_size - (base+size));
+ }
+ INT_MOD(sf->hdr.count, ARCH_CONVERT, -1);
+
+ xfs_idata_realloc(dp, -size, XFS_DATA_FORK);
+ dp->i_d.di_size -= size;
+ xfs_trans_log_inode(args->trans, dp, XFS_ILOG_CORE | XFS_ILOG_DDATA);
+
+ return(0);
+}
+
+/*
+ * Look up a name in a shortform directory structure.
+ */
+int
+xfs_dir_shortform_lookup(xfs_da_args_t *args)
+{
+ xfs_dir_shortform_t *sf;
+ xfs_dir_sf_entry_t *sfe;
+ int i;
+ xfs_inode_t *dp;
+
+ dp = args->dp;
+ ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
+ /*
+ * Catch the case where the conversion from shortform to leaf
+ * failed part way through.
+ */
+ if (dp->i_d.di_size < sizeof(xfs_dir_sf_hdr_t)) {
+ ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
+ return XFS_ERROR(EIO);
+ }
+ ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
+ ASSERT(dp->i_df.if_u1.if_data != NULL);
+ sf = (xfs_dir_shortform_t *)dp->i_df.if_u1.if_data;
+ if (args->namelen == 2 &&
+ args->name[0] == '.' && args->name[1] == '.') {
+ XFS_DIR_SF_GET_DIRINO(&sf->hdr.parent, &args->inumber);
+ return(XFS_ERROR(EEXIST));
+ }
+ if (args->namelen == 1 && args->name[0] == '.') {
+ args->inumber = dp->i_ino;
+ return(XFS_ERROR(EEXIST));
+ }
+ sfe = &sf->list[0];
+ for (i = INT_GET(sf->hdr.count, ARCH_CONVERT)-1; i >= 0; i--) {
+ if (sfe->namelen == args->namelen &&
+ sfe->name[0] == args->name[0] &&
+ memcmp(args->name, sfe->name, args->namelen) == 0) {
+ XFS_DIR_SF_GET_DIRINO(&sfe->inumber, &args->inumber);
+ return(XFS_ERROR(EEXIST));
+ }
+ sfe = XFS_DIR_SF_NEXTENTRY(sfe);
+ }
+ ASSERT(args->oknoent);
+ return(XFS_ERROR(ENOENT));
+}
+
+/*
+ * Convert from using the shortform to the leaf.
+ */
+int
+xfs_dir_shortform_to_leaf(xfs_da_args_t *iargs)
+{
+ xfs_inode_t *dp;
+ xfs_dir_shortform_t *sf;
+ xfs_dir_sf_entry_t *sfe;
+ xfs_da_args_t args;
+ xfs_ino_t inumber;
+ char *tmpbuffer;
+ int retval, i, size;
+ xfs_dablk_t blkno;
+ xfs_dabuf_t *bp;
+
+ dp = iargs->dp;
+ /*
+ * Catch the case where the conversion from shortform to leaf
+ * failed part way through.
+ */
+ if (dp->i_d.di_size < sizeof(xfs_dir_sf_hdr_t)) {
+ ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
+ return XFS_ERROR(EIO);
+ }
+ ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
+ ASSERT(dp->i_df.if_u1.if_data != NULL);
+ size = dp->i_df.if_bytes;
+ tmpbuffer = kmem_alloc(size, KM_SLEEP);
+ ASSERT(tmpbuffer != NULL);
+
+ memcpy(tmpbuffer, dp->i_df.if_u1.if_data, size);
+
+ sf = (xfs_dir_shortform_t *)tmpbuffer;
+ XFS_DIR_SF_GET_DIRINO(&sf->hdr.parent, &inumber);
+
+ xfs_idata_realloc(dp, -size, XFS_DATA_FORK);
+ dp->i_d.di_size = 0;
+ xfs_trans_log_inode(iargs->trans, dp, XFS_ILOG_CORE);
+ retval = xfs_da_grow_inode(iargs, &blkno);
+ if (retval)
+ goto out;
+
+ ASSERT(blkno == 0);
+ retval = xfs_dir_leaf_create(iargs, blkno, &bp);
+ if (retval)
+ goto out;
+ xfs_da_buf_done(bp);
+
+ args.name = ".";
+ args.namelen = 1;
+ args.hashval = xfs_dir_hash_dot;
+ args.inumber = dp->i_ino;
+ args.dp = dp;
+ args.firstblock = iargs->firstblock;
+ args.flist = iargs->flist;
+ args.total = iargs->total;
+ args.whichfork = XFS_DATA_FORK;
+ args.trans = iargs->trans;
+ args.justcheck = 0;
+ args.addname = args.oknoent = 1;
+ retval = xfs_dir_leaf_addname(&args);
+ if (retval)
+ goto out;
+
+ args.name = "..";
+ args.namelen = 2;
+ args.hashval = xfs_dir_hash_dotdot;
+ args.inumber = inumber;
+ retval = xfs_dir_leaf_addname(&args);
+ if (retval)
+ goto out;
+
+ sfe = &sf->list[0];
+ for (i = 0; i < INT_GET(sf->hdr.count, ARCH_CONVERT); i++) {
+ args.name = (char *)(sfe->name);
+ args.namelen = sfe->namelen;
+ args.hashval = xfs_da_hashname((char *)(sfe->name),
+ sfe->namelen);
+ XFS_DIR_SF_GET_DIRINO(&sfe->inumber, &args.inumber);
+ retval = xfs_dir_leaf_addname(&args);
+ if (retval)
+ goto out;
+ sfe = XFS_DIR_SF_NEXTENTRY(sfe);
+ }
+ retval = 0;
+
+out:
+ kmem_free(tmpbuffer, size);
+ return(retval);
+}
+
+STATIC int
+xfs_dir_shortform_compare(const void *a, const void *b)
+{
+ xfs_dir_sf_sort_t *sa, *sb;
+
+ sa = (xfs_dir_sf_sort_t *)a;
+ sb = (xfs_dir_sf_sort_t *)b;
+ if (sa->hash < sb->hash)
+ return -1;
+ else if (sa->hash > sb->hash)
+ return 1;
+ else
+ return sa->entno - sb->entno;
+}
+
+/*
+ * Copy out directory entries for getdents(), for shortform directories.
+ */
+/*ARGSUSED*/
+int
+xfs_dir_shortform_getdents(xfs_inode_t *dp, uio_t *uio, int *eofp,
+ xfs_dirent_t *dbp, xfs_dir_put_t put)
+{
+ xfs_dir_shortform_t *sf;
+ xfs_dir_sf_entry_t *sfe;
+ int retval, i, sbsize, nsbuf, lastresid=0, want_entno;
+ xfs_mount_t *mp;
+ xfs_dahash_t cookhash, hash;
+ xfs_dir_put_args_t p;
+ xfs_dir_sf_sort_t *sbuf, *sbp;
+
+ mp = dp->i_mount;
+ sf = (xfs_dir_shortform_t *)dp->i_df.if_u1.if_data;
+ cookhash = XFS_DA_COOKIE_HASH(mp, uio->uio_offset);
+ want_entno = XFS_DA_COOKIE_ENTRY(mp, uio->uio_offset);
+ nsbuf = INT_GET(sf->hdr.count, ARCH_CONVERT) + 2;
+ sbsize = (nsbuf + 1) * sizeof(*sbuf);
+ sbp = sbuf = kmem_alloc(sbsize, KM_SLEEP);
+
+ xfs_dir_trace_g_du("sf: start", dp, uio);
+
+ /*
+ * Collect all the entries into the buffer.
+ * Entry 0 is .
+ */
+ sbp->entno = 0;
+ sbp->seqno = 0;
+ sbp->hash = xfs_dir_hash_dot;
+ sbp->ino = dp->i_ino;
+ sbp->name = ".";
+ sbp->namelen = 1;
+ sbp++;
+
+ /*
+ * Entry 1 is ..
+ */
+ sbp->entno = 1;
+ sbp->seqno = 0;
+ sbp->hash = xfs_dir_hash_dotdot;
+ sbp->ino = XFS_GET_DIR_INO8(sf->hdr.parent);
+ sbp->name = "..";
+ sbp->namelen = 2;
+ sbp++;
+
+ /*
+ * Scan the directory data for the rest of the entries.
+ */
+ for (i = 0, sfe = &sf->list[0];
+ i < INT_GET(sf->hdr.count, ARCH_CONVERT); i++) {
+
+ if (unlikely(
+ ((char *)sfe < (char *)sf) ||
+ ((char *)sfe >= ((char *)sf + dp->i_df.if_bytes)))) {
+ xfs_dir_trace_g_du("sf: corrupted", dp, uio);
+ XFS_CORRUPTION_ERROR("xfs_dir_shortform_getdents",
+ XFS_ERRLEVEL_LOW, mp, sfe);
+ kmem_free(sbuf, sbsize);
+ return XFS_ERROR(EFSCORRUPTED);
+ }
+
+ sbp->entno = i + 2;
+ sbp->seqno = 0;
+ sbp->hash = xfs_da_hashname((char *)sfe->name, sfe->namelen);
+ sbp->ino = XFS_GET_DIR_INO8(sfe->inumber);
+ sbp->name = (char *)sfe->name;
+ sbp->namelen = sfe->namelen;
+ sfe = XFS_DIR_SF_NEXTENTRY(sfe);
+ sbp++;
+ }
+
+ /*
+ * Sort the entries on hash then entno.
+ */
+ qsort(sbuf, nsbuf, sizeof(*sbuf), xfs_dir_shortform_compare);
+ /*
+ * Stuff in last entry.
+ */
+ sbp->entno = nsbuf;
+ sbp->hash = XFS_DA_MAXHASH;
+ sbp->seqno = 0;
+ /*
+ * Figure out the sequence numbers in case there's a hash duplicate.
+ */
+ for (hash = sbuf->hash, sbp = sbuf + 1;
+ sbp < &sbuf[nsbuf + 1]; sbp++) {
+ if (sbp->hash == hash)
+ sbp->seqno = sbp[-1].seqno + 1;
+ else
+ hash = sbp->hash;
+ }
+
+ /*
+ * Set up put routine.
+ */
+ p.dbp = dbp;
+ p.put = put;
+ p.uio = uio;
+
+ /*
+ * Find our place.
+ */
+ for (sbp = sbuf; sbp < &sbuf[nsbuf + 1]; sbp++) {
+ if (sbp->hash > cookhash ||
+ (sbp->hash == cookhash && sbp->seqno >= want_entno))
+ break;
+ }
+
+ /*
+ * Did we fail to find anything? We stop at the last entry,
+ * the one we put maxhash into.
+ */
+ if (sbp == &sbuf[nsbuf]) {
+ kmem_free(sbuf, sbsize);
+ xfs_dir_trace_g_du("sf: hash beyond end", dp, uio);
+ uio->uio_offset = XFS_DA_MAKE_COOKIE(mp, 0, 0, XFS_DA_MAXHASH);
+ *eofp = 1;
+ return 0;
+ }
+
+ /*
+ * Loop putting entries into the user buffer.
+ */
+ while (sbp < &sbuf[nsbuf]) {
+ /*
+ * Save the first resid in a run of equal-hashval entries
+ * so that we can back them out if they don't all fit.
+ */
+ if (sbp->seqno == 0 || sbp == sbuf)
+ lastresid = uio->uio_resid;
+ XFS_PUT_COOKIE(p.cook, mp, 0, sbp[1].seqno, sbp[1].hash);
+ p.ino = sbp->ino;
+#if XFS_BIG_INUMS
+ p.ino += mp->m_inoadd;
+#endif
+ p.name = sbp->name;
+ p.namelen = sbp->namelen;
+ retval = p.put(&p);
+ if (!p.done) {
+ uio->uio_offset =
+ XFS_DA_MAKE_COOKIE(mp, 0, 0, sbp->hash);
+ kmem_free(sbuf, sbsize);
+ uio->uio_resid = lastresid;
+ xfs_dir_trace_g_du("sf: E-O-B", dp, uio);
+ return retval;
+ }
+ sbp++;
+ }
+ kmem_free(sbuf, sbsize);
+ uio->uio_offset = p.cook.o;
+ *eofp = 1;
+ xfs_dir_trace_g_du("sf: E-O-F", dp, uio);
+ return 0;
+}
+
+/*
+ * Look up a name in a shortform directory structure, replace the inode number.
+ */
+int
+xfs_dir_shortform_replace(xfs_da_args_t *args)
+{
+ xfs_dir_shortform_t *sf;
+ xfs_dir_sf_entry_t *sfe;
+ xfs_inode_t *dp;
+ int i;
+
+ dp = args->dp;
+ ASSERT(dp->i_df.if_flags & XFS_IFINLINE);
+ /*
+ * Catch the case where the conversion from shortform to leaf
+ * failed part way through.
+ */
+ if (dp->i_d.di_size < sizeof(xfs_dir_sf_hdr_t)) {
+ ASSERT(XFS_FORCED_SHUTDOWN(dp->i_mount));
+ return XFS_ERROR(EIO);
+ }
+ ASSERT(dp->i_df.if_bytes == dp->i_d.di_size);
+ ASSERT(dp->i_df.if_u1.if_data != NULL);
+ sf = (xfs_dir_shortform_t *)dp->i_df.if_u1.if_data;
+ if (args->namelen == 2 &&
+ args->name[0] == '.' && args->name[1] == '.') {
+ /* XXX - replace assert? */
+ XFS_DIR_SF_PUT_DIRINO(&args->inumber, &sf->hdr.parent);
+ xfs_trans_log_inode(args->trans, dp, XFS_ILOG_DDATA);
+ return(0);
+ }
+ ASSERT(args->namelen != 1 || args->name[0] != '.');
+ sfe = &sf->list[0];
+ for (i = INT_GET(sf->hdr.count, ARCH_CONVERT)-1; i >= 0; i--) {
+ if (sfe->namelen == args->namelen &&
+ sfe->name[0] == args->name[0] &&
+ memcmp(args->name, sfe->name, args->namelen) == 0) {
+ ASSERT(memcmp((char *)&args->inumber,
+ (char *)&sfe->inumber, sizeof(xfs_ino_t)));
+ XFS_DIR_SF_PUT_DIRINO(&args->inumber, &sfe->inumber);
+ xfs_trans_log_inode(args->trans, dp, XFS_ILOG_DDATA);
+ return(0);
+ }
+ sfe = XFS_DIR_SF_NEXTENTRY(sfe);
+ }
+ ASSERT(args->oknoent);
+ return(XFS_ERROR(ENOENT));
+}
+
+/*
+ * Convert a leaf directory to shortform structure
+ */
+int
+xfs_dir_leaf_to_shortform(xfs_da_args_t *iargs)
+{
+ xfs_dir_leafblock_t *leaf;
+ xfs_dir_leaf_hdr_t *hdr;
+ xfs_dir_leaf_entry_t *entry;
+ xfs_dir_leaf_name_t *namest;
+ xfs_da_args_t args;
+ xfs_inode_t *dp;
+ xfs_ino_t parent;
+ char *tmpbuffer;
+ int retval, i;
+ xfs_dabuf_t *bp;
+
+ dp = iargs->dp;
+ tmpbuffer = kmem_alloc(XFS_LBSIZE(dp->i_mount), KM_SLEEP);
+ ASSERT(tmpbuffer != NULL);
+
+ retval = xfs_da_read_buf(iargs->trans, iargs->dp, 0, -1, &bp,
+ XFS_DATA_FORK);
+ if (retval)
+ goto out;
+ ASSERT(bp != NULL);
+ memcpy(tmpbuffer, bp->data, XFS_LBSIZE(dp->i_mount));
+ leaf = (xfs_dir_leafblock_t *)tmpbuffer;
+ ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
+ memset(bp->data, 0, XFS_LBSIZE(dp->i_mount));
+
+ /*
+ * Find and special case the parent inode number
+ */
+ hdr = &leaf->hdr;
+ entry = &leaf->entries[0];
+ for (i = INT_GET(hdr->count, ARCH_CONVERT)-1; i >= 0; entry++, i--) {
+ namest = XFS_DIR_LEAF_NAMESTRUCT(leaf, INT_GET(entry->nameidx, ARCH_CONVERT));
+ if ((entry->namelen == 2) &&
+ (namest->name[0] == '.') &&
+ (namest->name[1] == '.')) {
+ XFS_DIR_SF_GET_DIRINO(&namest->inumber, &parent);
+ entry->nameidx = 0;
+ } else if ((entry->namelen == 1) && (namest->name[0] == '.')) {
+ entry->nameidx = 0;
+ }
+ }
+ retval = xfs_da_shrink_inode(iargs, 0, bp);
+ if (retval)
+ goto out;
+ retval = xfs_dir_shortform_create(iargs, parent);
+ if (retval)
+ goto out;
+
+ /*
+ * Copy the rest of the filenames
+ */
+ entry = &leaf->entries[0];
+ args.dp = dp;
+ args.firstblock = iargs->firstblock;
+ args.flist = iargs->flist;
+ args.total = iargs->total;
+ args.whichfork = XFS_DATA_FORK;
+ args.trans = iargs->trans;
+ args.justcheck = 0;
+ args.addname = args.oknoent = 1;
+ for (i = 0; i < INT_GET(hdr->count, ARCH_CONVERT); entry++, i++) {
+ if (!entry->nameidx)
+ continue;
+ namest = XFS_DIR_LEAF_NAMESTRUCT(leaf, INT_GET(entry->nameidx, ARCH_CONVERT));
+ args.name = (char *)(namest->name);
+ args.namelen = entry->namelen;
+ args.hashval = INT_GET(entry->hashval, ARCH_CONVERT);
+ XFS_DIR_SF_GET_DIRINO(&namest->inumber, &args.inumber);
+ xfs_dir_shortform_addname(&args);
+ }
+
+out:
+ kmem_free(tmpbuffer, XFS_LBSIZE(dp->i_mount));
+ return(retval);
+}
+
+/*
+ * Convert from using a single leaf to a root node and a leaf.
+ */
+int
+xfs_dir_leaf_to_node(xfs_da_args_t *args)
+{
+ xfs_dir_leafblock_t *leaf;
+ xfs_da_intnode_t *node;
+ xfs_inode_t *dp;
+ xfs_dabuf_t *bp1, *bp2;
+ xfs_dablk_t blkno;
+ int retval;
+
+ dp = args->dp;
+ retval = xfs_da_grow_inode(args, &blkno);
+ ASSERT(blkno == 1);
+ if (retval)
+ return(retval);
+ retval = xfs_da_read_buf(args->trans, args->dp, 0, -1, &bp1,
+ XFS_DATA_FORK);
+ if (retval)
+ return(retval);
+ ASSERT(bp1 != NULL);
+ retval = xfs_da_get_buf(args->trans, args->dp, 1, -1, &bp2,
+ XFS_DATA_FORK);
+ if (retval) {
+ xfs_da_buf_done(bp1);
+ return(retval);
+ }
+ ASSERT(bp2 != NULL);
+ memcpy(bp2->data, bp1->data, XFS_LBSIZE(dp->i_mount));
+ xfs_da_buf_done(bp1);
+ xfs_da_log_buf(args->trans, bp2, 0, XFS_LBSIZE(dp->i_mount) - 1);
+
+ /*
+ * Set up the new root node.
+ */
+ retval = xfs_da_node_create(args, 0, 1, &bp1, XFS_DATA_FORK);
+ if (retval) {
+ xfs_da_buf_done(bp2);
+ return(retval);
+ }
+ node = bp1->data;
+ leaf = bp2->data;
+ ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
+ INT_SET(node->btree[0].hashval, ARCH_CONVERT, INT_GET(leaf->entries[ INT_GET(leaf->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT));
+ xfs_da_buf_done(bp2);
+ INT_SET(node->btree[0].before, ARCH_CONVERT, blkno);
+ INT_SET(node->hdr.count, ARCH_CONVERT, 1);
+ xfs_da_log_buf(args->trans, bp1,
+ XFS_DA_LOGRANGE(node, &node->btree[0], sizeof(node->btree[0])));
+ xfs_da_buf_done(bp1);
+
+ return(retval);
+}
+
+
+/*========================================================================
+ * Routines used for growing the Btree.
+ *========================================================================*/
+
+/*
+ * Create the initial contents of a leaf directory
+ * or a leaf in a node directory.
+ */
+int
+xfs_dir_leaf_create(xfs_da_args_t *args, xfs_dablk_t blkno, xfs_dabuf_t **bpp)
+{
+ xfs_dir_leafblock_t *leaf;
+ xfs_dir_leaf_hdr_t *hdr;
+ xfs_inode_t *dp;
+ xfs_dabuf_t *bp;
+ int retval;
+
+ dp = args->dp;
+ ASSERT(dp != NULL);
+ retval = xfs_da_get_buf(args->trans, dp, blkno, -1, &bp, XFS_DATA_FORK);
+ if (retval)
+ return(retval);
+ ASSERT(bp != NULL);
+ leaf = bp->data;
+ memset((char *)leaf, 0, XFS_LBSIZE(dp->i_mount));
+ hdr = &leaf->hdr;
+ INT_SET(hdr->info.magic, ARCH_CONVERT, XFS_DIR_LEAF_MAGIC);
+ INT_SET(hdr->firstused, ARCH_CONVERT, XFS_LBSIZE(dp->i_mount));
+ if (!hdr->firstused)
+ INT_SET(hdr->firstused, ARCH_CONVERT, XFS_LBSIZE(dp->i_mount) - 1);
+ INT_SET(hdr->freemap[0].base, ARCH_CONVERT, sizeof(xfs_dir_leaf_hdr_t));
+ INT_SET(hdr->freemap[0].size, ARCH_CONVERT, INT_GET(hdr->firstused, ARCH_CONVERT) - INT_GET(hdr->freemap[0].base, ARCH_CONVERT));
+
+ xfs_da_log_buf(args->trans, bp, 0, XFS_LBSIZE(dp->i_mount) - 1);
+
+ *bpp = bp;
+ return(0);
+}
+
+/*
+ * Split the leaf node, rebalance, then add the new entry.
+ */
+int
+xfs_dir_leaf_split(xfs_da_state_t *state, xfs_da_state_blk_t *oldblk,
+ xfs_da_state_blk_t *newblk)
+{
+ xfs_dablk_t blkno;
+ xfs_da_args_t *args;
+ int error;
+
+ /*
+ * Allocate space for a new leaf node.
+ */
+ args = state->args;
+ ASSERT(args != NULL);
+ ASSERT(oldblk->magic == XFS_DIR_LEAF_MAGIC);
+ error = xfs_da_grow_inode(args, &blkno);
+ if (error)
+ return(error);
+ error = xfs_dir_leaf_create(args, blkno, &newblk->bp);
+ if (error)
+ return(error);
+ newblk->blkno = blkno;
+ newblk->magic = XFS_DIR_LEAF_MAGIC;
+
+ /*
+ * Rebalance the entries across the two leaves.
+ */
+ xfs_dir_leaf_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_dir_leaf_add(oldblk->bp, args, oldblk->index);
+ } else {
+ error = xfs_dir_leaf_add(newblk->bp, args, newblk->index);
+ }
+
+ /*
+ * Update last hashval in each block since we added the name.
+ */
+ oldblk->hashval = xfs_dir_leaf_lasthash(oldblk->bp, NULL);
+ newblk->hashval = xfs_dir_leaf_lasthash(newblk->bp, NULL);
+ return(error);
+}
+
+/*
+ * Add a name to the leaf directory structure.
+ *
+ * Must take into account fragmented leaves and leaves where spacemap has
+ * lost some freespace information (ie: holes).
+ */
+int
+xfs_dir_leaf_add(xfs_dabuf_t *bp, xfs_da_args_t *args, int index)
+{
+ xfs_dir_leafblock_t *leaf;
+ xfs_dir_leaf_hdr_t *hdr;
+ xfs_dir_leaf_map_t *map;
+ int tablesize, entsize, sum, i, tmp, error;
+
+ leaf = bp->data;
+ ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
+ ASSERT((index >= 0) && (index <= INT_GET(leaf->hdr.count, ARCH_CONVERT)));
+ hdr = &leaf->hdr;
+ entsize = XFS_DIR_LEAF_ENTSIZE_BYNAME(args->namelen);
+
+ /*
+ * Search through freemap for first-fit on new name length.
+ * (may need to figure in size of entry struct too)
+ */
+ tablesize = (INT_GET(hdr->count, ARCH_CONVERT) + 1) * (uint)sizeof(xfs_dir_leaf_entry_t)
+ + (uint)sizeof(xfs_dir_leaf_hdr_t);
+ map = &hdr->freemap[XFS_DIR_LEAF_MAPSIZE-1];
+ for (sum = 0, i = XFS_DIR_LEAF_MAPSIZE-1; i >= 0; map--, i--) {
+ if (tablesize > INT_GET(hdr->firstused, ARCH_CONVERT)) {
+ sum += INT_GET(map->size, ARCH_CONVERT);
+ continue;
+ }
+ if (!map->size)
+ continue; /* no space in this map */
+ tmp = entsize;
+ if (INT_GET(map->base, ARCH_CONVERT) < INT_GET(hdr->firstused, ARCH_CONVERT))
+ tmp += (uint)sizeof(xfs_dir_leaf_entry_t);
+ if (INT_GET(map->size, ARCH_CONVERT) >= tmp) {
+ if (!args->justcheck)
+ xfs_dir_leaf_add_work(bp, args, index, i);
+ return(0);
+ }
+ sum += INT_GET(map->size, ARCH_CONVERT);
+ }
+
+ /*
+ * If there are no holes in the address space of the block,
+ * and we don't have enough freespace, then compaction will do us
+ * no good and we should just give up.
+ */
+ if (!hdr->holes && (sum < entsize))
+ return(XFS_ERROR(ENOSPC));
+
+ /*
+ * Compact the entries to coalesce free space.
+ * Pass the justcheck flag so the checking pass can return
+ * an error, without changing anything, if it won't fit.
+ */
+ error = xfs_dir_leaf_compact(args->trans, bp,
+ args->total == 0 ?
+ entsize +
+ (uint)sizeof(xfs_dir_leaf_entry_t) : 0,
+ args->justcheck);
+ if (error)
+ return(error);
+ /*
+ * After compaction, the block is guaranteed to have only one
+ * free region, in freemap[0]. If it is not big enough, give up.
+ */
+ if (INT_GET(hdr->freemap[0].size, ARCH_CONVERT) <
+ (entsize + (uint)sizeof(xfs_dir_leaf_entry_t)))
+ return(XFS_ERROR(ENOSPC));
+
+ if (!args->justcheck)
+ xfs_dir_leaf_add_work(bp, args, index, 0);
+ return(0);
+}
+
+/*
+ * Add a name to a leaf directory structure.
+ */
+STATIC void
+xfs_dir_leaf_add_work(xfs_dabuf_t *bp, xfs_da_args_t *args, int index,
+ int mapindex)
+{
+ xfs_dir_leafblock_t *leaf;
+ xfs_dir_leaf_hdr_t *hdr;
+ xfs_dir_leaf_entry_t *entry;
+ xfs_dir_leaf_name_t *namest;
+ xfs_dir_leaf_map_t *map;
+ /* REFERENCED */
+ xfs_mount_t *mp;
+ int tmp, i;
+
+ leaf = bp->data;
+ ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
+ hdr = &leaf->hdr;
+ ASSERT((mapindex >= 0) && (mapindex < XFS_DIR_LEAF_MAPSIZE));
+ ASSERT((index >= 0) && (index <= INT_GET(hdr->count, ARCH_CONVERT)));
+
+ /*
+ * Force open some space in the entry array and fill it in.
+ */
+ entry = &leaf->entries[index];
+ if (index < INT_GET(hdr->count, ARCH_CONVERT)) {
+ tmp = INT_GET(hdr->count, ARCH_CONVERT) - index;
+ tmp *= (uint)sizeof(xfs_dir_leaf_entry_t);
+ memmove(entry + 1, entry, tmp);
+ xfs_da_log_buf(args->trans, bp,
+ XFS_DA_LOGRANGE(leaf, entry, tmp + (uint)sizeof(*entry)));
+ }
+ INT_MOD(hdr->count, ARCH_CONVERT, +1);
+
+ /*
+ * Allocate space for the new string (at the end of the run).
+ */
+ map = &hdr->freemap[mapindex];
+ mp = args->trans->t_mountp;
+ ASSERT(INT_GET(map->base, ARCH_CONVERT) < XFS_LBSIZE(mp));
+ ASSERT(INT_GET(map->size, ARCH_CONVERT) >= XFS_DIR_LEAF_ENTSIZE_BYNAME(args->namelen));
+ ASSERT(INT_GET(map->size, ARCH_CONVERT) < XFS_LBSIZE(mp));
+ INT_MOD(map->size, ARCH_CONVERT, -(XFS_DIR_LEAF_ENTSIZE_BYNAME(args->namelen)));
+ INT_SET(entry->nameidx, ARCH_CONVERT, INT_GET(map->base, ARCH_CONVERT) + INT_GET(map->size, ARCH_CONVERT));
+ INT_SET(entry->hashval, ARCH_CONVERT, args->hashval);
+ entry->namelen = args->namelen;
+ xfs_da_log_buf(args->trans, bp,
+ XFS_DA_LOGRANGE(leaf, entry, sizeof(*entry)));
+
+ /*
+ * Copy the string and inode number into the new space.
+ */
+ namest = XFS_DIR_LEAF_NAMESTRUCT(leaf, INT_GET(entry->nameidx, ARCH_CONVERT));
+ XFS_DIR_SF_PUT_DIRINO(&args->inumber, &namest->inumber);
+ memcpy(namest->name, args->name, args->namelen);
+ xfs_da_log_buf(args->trans, bp,
+ XFS_DA_LOGRANGE(leaf, namest, XFS_DIR_LEAF_ENTSIZE_BYENTRY(entry)));
+
+ /*
+ * Update the control info for this leaf node
+ */
+ if (INT_GET(entry->nameidx, ARCH_CONVERT) < INT_GET(hdr->firstused, ARCH_CONVERT))
+ INT_COPY(hdr->firstused, entry->nameidx, ARCH_CONVERT);
+ ASSERT(INT_GET(hdr->firstused, ARCH_CONVERT) >= ((INT_GET(hdr->count, ARCH_CONVERT)*sizeof(*entry))+sizeof(*hdr)));
+ tmp = (INT_GET(hdr->count, ARCH_CONVERT)-1) * (uint)sizeof(xfs_dir_leaf_entry_t)
+ + (uint)sizeof(xfs_dir_leaf_hdr_t);
+ map = &hdr->freemap[0];
+ for (i = 0; i < XFS_DIR_LEAF_MAPSIZE; map++, i++) {
+ if (INT_GET(map->base, ARCH_CONVERT) == tmp) {
+ INT_MOD(map->base, ARCH_CONVERT, (uint)sizeof(xfs_dir_leaf_entry_t));
+ INT_MOD(map->size, ARCH_CONVERT, -((uint)sizeof(xfs_dir_leaf_entry_t)));
+ }
+ }
+ INT_MOD(hdr->namebytes, ARCH_CONVERT, args->namelen);
+ xfs_da_log_buf(args->trans, bp,
+ XFS_DA_LOGRANGE(leaf, hdr, sizeof(*hdr)));
+}
+
+/*
+ * Garbage collect a leaf directory block by copying it to a new buffer.
+ */
+STATIC int
+xfs_dir_leaf_compact(xfs_trans_t *trans, xfs_dabuf_t *bp, int musthave,
+ int justcheck)
+{
+ xfs_dir_leafblock_t *leaf_s, *leaf_d;
+ xfs_dir_leaf_hdr_t *hdr_s, *hdr_d;
+ xfs_mount_t *mp;
+ char *tmpbuffer;
+ char *tmpbuffer2=NULL;
+ int rval;
+ int lbsize;
+
+ mp = trans->t_mountp;
+ lbsize = XFS_LBSIZE(mp);
+ tmpbuffer = kmem_alloc(lbsize, KM_SLEEP);
+ ASSERT(tmpbuffer != NULL);
+ memcpy(tmpbuffer, bp->data, lbsize);
+
+ /*
+ * Make a second copy in case xfs_dir_leaf_moveents()
+ * below destroys the original.
+ */
+ if (musthave || justcheck) {
+ tmpbuffer2 = kmem_alloc(lbsize, KM_SLEEP);
+ memcpy(tmpbuffer2, bp->data, lbsize);
+ }
+ memset(bp->data, 0, lbsize);
+
+ /*
+ * Copy basic information
+ */
+ leaf_s = (xfs_dir_leafblock_t *)tmpbuffer;
+ leaf_d = bp->data;
+ hdr_s = &leaf_s->hdr;
+ hdr_d = &leaf_d->hdr;
+ hdr_d->info = hdr_s->info; /* struct copy */
+ INT_SET(hdr_d->firstused, ARCH_CONVERT, lbsize);
+ if (!hdr_d->firstused)
+ INT_SET(hdr_d->firstused, ARCH_CONVERT, lbsize - 1);
+ hdr_d->namebytes = 0;
+ hdr_d->count = 0;
+ hdr_d->holes = 0;
+ INT_SET(hdr_d->freemap[0].base, ARCH_CONVERT, sizeof(xfs_dir_leaf_hdr_t));
+ INT_SET(hdr_d->freemap[0].size, ARCH_CONVERT, INT_GET(hdr_d->firstused, ARCH_CONVERT) - INT_GET(hdr_d->freemap[0].base, ARCH_CONVERT));
+
+ /*
+ * Copy all entry's in the same (sorted) order,
+ * but allocate filenames packed and in sequence.
+ * This changes the source (leaf_s) as well.
+ */
+ xfs_dir_leaf_moveents(leaf_s, 0, leaf_d, 0, (int)INT_GET(hdr_s->count, ARCH_CONVERT), mp);
+
+ if (musthave && INT_GET(hdr_d->freemap[0].size, ARCH_CONVERT) < musthave)
+ rval = XFS_ERROR(ENOSPC);
+ else
+ rval = 0;
+
+ if (justcheck || rval == ENOSPC) {
+ ASSERT(tmpbuffer2);
+ memcpy(bp->data, tmpbuffer2, lbsize);
+ } else {
+ xfs_da_log_buf(trans, bp, 0, lbsize - 1);
+ }
+
+ kmem_free(tmpbuffer, lbsize);
+ if (musthave || justcheck)
+ kmem_free(tmpbuffer2, lbsize);
+ return(rval);
+}
+
+/*
+ * Redistribute the directory entries between two leaf nodes,
+ * taking into account the size of the new entry.
+ *
+ * NOTE: if new block is empty, then it will get the upper half of old block.
+ */
+STATIC void
+xfs_dir_leaf_rebalance(xfs_da_state_t *state, xfs_da_state_blk_t *blk1,
+ xfs_da_state_blk_t *blk2)
+{
+ xfs_da_state_blk_t *tmp_blk;
+ xfs_dir_leafblock_t *leaf1, *leaf2;
+ xfs_dir_leaf_hdr_t *hdr1, *hdr2;
+ int count, totallen, max, space, swap;
+
+ /*
+ * Set up environment.
+ */
+ ASSERT(blk1->magic == XFS_DIR_LEAF_MAGIC);
+ ASSERT(blk2->magic == XFS_DIR_LEAF_MAGIC);
+ leaf1 = blk1->bp->data;
+ leaf2 = blk2->bp->data;
+ ASSERT(INT_GET(leaf1->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
+ ASSERT(INT_GET(leaf2->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
+
+ /*
+ * Check ordering of blocks, reverse if it makes things simpler.
+ */
+ swap = 0;
+ if (xfs_dir_leaf_order(blk1->bp, blk2->bp)) {
+ tmp_blk = blk1;
+ blk1 = blk2;
+ blk2 = tmp_blk;
+ leaf1 = blk1->bp->data;
+ leaf2 = blk2->bp->data;
+ swap = 1;
+ }
+ hdr1 = &leaf1->hdr;
+ hdr2 = &leaf2->hdr;
+
+ /*
+ * Examine entries until we reduce the absolute difference in
+ * byte usage between the two blocks to a minimum. Then get
+ * the direction to copy and the number of elements to move.
+ */
+ state->inleaf = xfs_dir_leaf_figure_balance(state, blk1, blk2,
+ &count, &totallen);
+ if (swap)
+ state->inleaf = !state->inleaf;
+
+ /*
+ * Move any entries required from leaf to leaf:
+ */
+ if (count < INT_GET(hdr1->count, ARCH_CONVERT)) {
+ /*
+ * Figure the total bytes to be added to the destination leaf.
+ */
+ count = INT_GET(hdr1->count, ARCH_CONVERT) - count; /* number entries being moved */
+ space = INT_GET(hdr1->namebytes, ARCH_CONVERT) - totallen;
+ space += count * ((uint)sizeof(xfs_dir_leaf_name_t)-1);
+ space += count * (uint)sizeof(xfs_dir_leaf_entry_t);
+
+ /*
+ * leaf2 is the destination, compact it if it looks tight.
+ */
+ max = INT_GET(hdr2->firstused, ARCH_CONVERT) - (uint)sizeof(xfs_dir_leaf_hdr_t);
+ max -= INT_GET(hdr2->count, ARCH_CONVERT) * (uint)sizeof(xfs_dir_leaf_entry_t);
+ if (space > max) {
+ xfs_dir_leaf_compact(state->args->trans, blk2->bp,
+ 0, 0);
+ }
+
+ /*
+ * Move high entries from leaf1 to low end of leaf2.
+ */
+ xfs_dir_leaf_moveents(leaf1, INT_GET(hdr1->count, ARCH_CONVERT) - count,
+ leaf2, 0, count, state->mp);
+
+ xfs_da_log_buf(state->args->trans, blk1->bp, 0,
+ state->blocksize-1);
+ xfs_da_log_buf(state->args->trans, blk2->bp, 0,
+ state->blocksize-1);
+
+ } else if (count > INT_GET(hdr1->count, ARCH_CONVERT)) {
+ /*
+ * Figure the total bytes to be added to the destination leaf.
+ */
+ count -= INT_GET(hdr1->count, ARCH_CONVERT); /* number entries being moved */
+ space = totallen - INT_GET(hdr1->namebytes, ARCH_CONVERT);
+ space += count * ((uint)sizeof(xfs_dir_leaf_name_t)-1);
+ space += count * (uint)sizeof(xfs_dir_leaf_entry_t);
+
+ /*
+ * leaf1 is the destination, compact it if it looks tight.
+ */
+ max = INT_GET(hdr1->firstused, ARCH_CONVERT) - (uint)sizeof(xfs_dir_leaf_hdr_t);
+ max -= INT_GET(hdr1->count, ARCH_CONVERT) * (uint)sizeof(xfs_dir_leaf_entry_t);
+ if (space > max) {
+ xfs_dir_leaf_compact(state->args->trans, blk1->bp,
+ 0, 0);
+ }
+
+ /*
+ * Move low entries from leaf2 to high end of leaf1.
+ */
+ xfs_dir_leaf_moveents(leaf2, 0, leaf1, (int)INT_GET(hdr1->count, ARCH_CONVERT),
+ count, state->mp);
+
+ xfs_da_log_buf(state->args->trans, blk1->bp, 0,
+ state->blocksize-1);
+ xfs_da_log_buf(state->args->trans, blk2->bp, 0,
+ state->blocksize-1);
+ }
+
+ /*
+ * Copy out last hashval in each block for B-tree code.
+ */
+ blk1->hashval = INT_GET(leaf1->entries[ INT_GET(leaf1->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT);
+ blk2->hashval = INT_GET(leaf2->entries[ INT_GET(leaf2->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT);
+
+ /*
+ * Adjust the expected index for insertion.
+ * GROT: this doesn't work unless blk2 was originally empty.
+ */
+ if (!state->inleaf) {
+ blk2->index = blk1->index - INT_GET(leaf1->hdr.count, ARCH_CONVERT);
+ }
+}
+
+/*
+ * Examine entries until we reduce the absolute difference in
+ * byte usage between the two blocks to a minimum.
+ * GROT: Is this really necessary? With other than a 512 byte blocksize,
+ * GROT: there will always be enough room in either block for a new entry.
+ * GROT: Do a double-split for this case?
+ */
+STATIC int
+xfs_dir_leaf_figure_balance(xfs_da_state_t *state,
+ xfs_da_state_blk_t *blk1,
+ xfs_da_state_blk_t *blk2,
+ int *countarg, int *namebytesarg)
+{
+ xfs_dir_leafblock_t *leaf1, *leaf2;
+ xfs_dir_leaf_hdr_t *hdr1, *hdr2;
+ xfs_dir_leaf_entry_t *entry;
+ int count, max, totallen, half;
+ int lastdelta, foundit, tmp;
+
+ /*
+ * Set up environment.
+ */
+ leaf1 = blk1->bp->data;
+ leaf2 = blk2->bp->data;
+ hdr1 = &leaf1->hdr;
+ hdr2 = &leaf2->hdr;
+ foundit = 0;
+ totallen = 0;
+
+ /*
+ * Examine entries until we reduce the absolute difference in
+ * byte usage between the two blocks to a minimum.
+ */
+ max = INT_GET(hdr1->count, ARCH_CONVERT) + INT_GET(hdr2->count, ARCH_CONVERT);
+ half = (max+1) * (uint)(sizeof(*entry)+sizeof(xfs_dir_leaf_entry_t)-1);
+ half += INT_GET(hdr1->namebytes, ARCH_CONVERT) + INT_GET(hdr2->namebytes, ARCH_CONVERT) + state->args->namelen;
+ half /= 2;
+ lastdelta = state->blocksize;
+ entry = &leaf1->entries[0];
+ for (count = 0; count < max; entry++, count++) {
+
+#define XFS_DIR_ABS(A) (((A) < 0) ? -(A) : (A))
+ /*
+ * The new entry is in the first block, account for it.
+ */
+ if (count == blk1->index) {
+ tmp = totallen + (uint)sizeof(*entry)
+ + XFS_DIR_LEAF_ENTSIZE_BYNAME(state->args->namelen);
+ if (XFS_DIR_ABS(half - tmp) > lastdelta)
+ break;
+ lastdelta = XFS_DIR_ABS(half - tmp);
+ totallen = tmp;
+ foundit = 1;
+ }
+
+ /*
+ * Wrap around into the second block if necessary.
+ */
+ if (count == INT_GET(hdr1->count, ARCH_CONVERT)) {
+ leaf1 = leaf2;
+ entry = &leaf1->entries[0];
+ }
+
+ /*
+ * Figure out if next leaf entry would be too much.
+ */
+ tmp = totallen + (uint)sizeof(*entry)
+ + XFS_DIR_LEAF_ENTSIZE_BYENTRY(entry);
+ if (XFS_DIR_ABS(half - tmp) > lastdelta)
+ break;
+ lastdelta = XFS_DIR_ABS(half - tmp);
+ totallen = tmp;
+#undef XFS_DIR_ABS
+ }
+
+ /*
+ * Calculate the number of namebytes that will end up in lower block.
+ * If new entry not in lower block, fix up the count.
+ */
+ totallen -=
+ count * (uint)(sizeof(*entry)+sizeof(xfs_dir_leaf_entry_t)-1);
+ if (foundit) {
+ totallen -= (sizeof(*entry)+sizeof(xfs_dir_leaf_entry_t)-1) +
+ state->args->namelen;
+ }
+
+ *countarg = count;
+ *namebytesarg = totallen;
+ return(foundit);
+}
+
+/*========================================================================
+ * Routines used for shrinking the Btree.
+ *========================================================================*/
+
+/*
+ * Check a leaf block and its neighbors to see if the block should be
+ * collapsed into one or the other neighbor. Always keep the block
+ * with the smaller block number.
+ * If the current block is over 50% full, don't try to join it, return 0.
+ * If the block is empty, fill in the state structure and return 2.
+ * If it can be collapsed, fill in the state structure and return 1.
+ * If nothing can be done, return 0.
+ */
+int
+xfs_dir_leaf_toosmall(xfs_da_state_t *state, int *action)
+{
+ xfs_dir_leafblock_t *leaf;
+ xfs_da_state_blk_t *blk;
+ xfs_da_blkinfo_t *info;
+ int count, bytes, forward, error, retval, i;
+ xfs_dablk_t blkno;
+ xfs_dabuf_t *bp;
+
+ /*
+ * Check for the degenerate case of the block being over 50% full.
+ * If so, it's not worth even looking to see if we might be able
+ * to coalesce with a sibling.
+ */
+ blk = &state->path.blk[ state->path.active-1 ];
+ info = blk->bp->data;
+ ASSERT(INT_GET(info->magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
+ leaf = (xfs_dir_leafblock_t *)info;
+ count = INT_GET(leaf->hdr.count, ARCH_CONVERT);
+ bytes = (uint)sizeof(xfs_dir_leaf_hdr_t) +
+ count * (uint)sizeof(xfs_dir_leaf_entry_t) +
+ count * ((uint)sizeof(xfs_dir_leaf_name_t)-1) +
+ INT_GET(leaf->hdr.namebytes, ARCH_CONVERT);
+ if (bytes > (state->blocksize >> 1)) {
+ *action = 0; /* blk over 50%, don't try to join */
+ return(0);
+ }
+
+ /*
+ * Check for the degenerate case of the block being empty.
+ * If the block is empty, we'll simply delete it, no need to
+ * coalesce it with a sibling block. We choose (aribtrarily)
+ * to merge with the forward block unless it is NULL.
+ */
+ if (count == 0) {
+ /*
+ * Make altpath point to the block we want to keep and
+ * path point to the block we want to drop (this one).
+ */
+ forward = info->forw;
+ memcpy(&state->altpath, &state->path, sizeof(state->path));
+ error = xfs_da_path_shift(state, &state->altpath, forward,
+ 0, &retval);
+ if (error)
+ return(error);
+ if (retval) {
+ *action = 0;
+ } else {
+ *action = 2;
+ }
+ return(0);
+ }
+
+ /*
+ * Examine each sibling block to see if we can coalesce with
+ * at least 25% free space to spare. We need to figure out
+ * whether to merge with the forward or the backward block.
+ * We prefer coalescing with the lower numbered sibling so as
+ * to shrink a directory over time.
+ */
+ forward = (INT_GET(info->forw, ARCH_CONVERT) < INT_GET(info->back, ARCH_CONVERT)); /* start with smaller blk num */
+ for (i = 0; i < 2; forward = !forward, i++) {
+ if (forward)
+ blkno = INT_GET(info->forw, ARCH_CONVERT);
+ else
+ blkno = INT_GET(info->back, ARCH_CONVERT);
+ if (blkno == 0)
+ continue;
+ error = xfs_da_read_buf(state->args->trans, state->args->dp,
+ blkno, -1, &bp,
+ XFS_DATA_FORK);
+ if (error)
+ return(error);
+ ASSERT(bp != NULL);
+
+ leaf = (xfs_dir_leafblock_t *)info;
+ count = INT_GET(leaf->hdr.count, ARCH_CONVERT);
+ bytes = state->blocksize - (state->blocksize>>2);
+ bytes -= INT_GET(leaf->hdr.namebytes, ARCH_CONVERT);
+ leaf = bp->data;
+ ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
+ count += INT_GET(leaf->hdr.count, ARCH_CONVERT);
+ bytes -= INT_GET(leaf->hdr.namebytes, ARCH_CONVERT);
+ bytes -= count * ((uint)sizeof(xfs_dir_leaf_name_t) - 1);
+ bytes -= count * (uint)sizeof(xfs_dir_leaf_entry_t);
+ bytes -= (uint)sizeof(xfs_dir_leaf_hdr_t);
+ if (bytes >= 0)
+ break; /* fits with at least 25% to spare */
+
+ xfs_da_brelse(state->args->trans, bp);
+ }
+ if (i >= 2) {
+ *action = 0;
+ return(0);
+ }
+ 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, &retval);
+ } else {
+ error = xfs_da_path_shift(state, &state->path, forward,
+ 0, &retval);
+ }
+ if (error)
+ return(error);
+ if (retval) {
+ *action = 0;
+ } else {
+ *action = 1;
+ }
+ return(0);
+}
+
+/*
+ * Remove a name from the leaf directory structure.
+ *
+ * Return 1 if leaf is less than 37% full, 0 if >= 37% full.
+ * If two leaves are 37% full, when combined they will leave 25% free.
+ */
+int
+xfs_dir_leaf_remove(xfs_trans_t *trans, xfs_dabuf_t *bp, int index)
+{
+ xfs_dir_leafblock_t *leaf;
+ xfs_dir_leaf_hdr_t *hdr;
+ xfs_dir_leaf_map_t *map;
+ xfs_dir_leaf_entry_t *entry;
+ xfs_dir_leaf_name_t *namest;
+ int before, after, smallest, entsize;
+ int tablesize, tmp, i;
+ xfs_mount_t *mp;
+
+ leaf = bp->data;
+ ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
+ hdr = &leaf->hdr;
+ mp = trans->t_mountp;
+ ASSERT((INT_GET(hdr->count, ARCH_CONVERT) > 0) && (INT_GET(hdr->count, ARCH_CONVERT) < (XFS_LBSIZE(mp)/8)));
+ ASSERT((index >= 0) && (index < INT_GET(hdr->count, ARCH_CONVERT)));
+ ASSERT(INT_GET(hdr->firstused, ARCH_CONVERT) >= ((INT_GET(hdr->count, ARCH_CONVERT)*sizeof(*entry))+sizeof(*hdr)));
+ entry = &leaf->entries[index];
+ ASSERT(INT_GET(entry->nameidx, ARCH_CONVERT) >= INT_GET(hdr->firstused, ARCH_CONVERT));
+ ASSERT(INT_GET(entry->nameidx, ARCH_CONVERT) < XFS_LBSIZE(mp));
+
+ /*
+ * Scan through free region table:
+ * check for adjacency of free'd entry with an existing one,
+ * find smallest free region in case we need to replace it,
+ * adjust any map that borders the entry table,
+ */
+ tablesize = INT_GET(hdr->count, ARCH_CONVERT) * (uint)sizeof(xfs_dir_leaf_entry_t)
+ + (uint)sizeof(xfs_dir_leaf_hdr_t);
+ map = &hdr->freemap[0];
+ tmp = INT_GET(map->size, ARCH_CONVERT);
+ before = after = -1;
+ smallest = XFS_DIR_LEAF_MAPSIZE - 1;
+ entsize = XFS_DIR_LEAF_ENTSIZE_BYENTRY(entry);
+ for (i = 0; i < XFS_DIR_LEAF_MAPSIZE; map++, i++) {
+ ASSERT(INT_GET(map->base, ARCH_CONVERT) < XFS_LBSIZE(mp));
+ ASSERT(INT_GET(map->size, ARCH_CONVERT) < XFS_LBSIZE(mp));
+ if (INT_GET(map->base, ARCH_CONVERT) == tablesize) {
+ INT_MOD(map->base, ARCH_CONVERT, -((uint)sizeof(xfs_dir_leaf_entry_t)));
+ INT_MOD(map->size, ARCH_CONVERT, (uint)sizeof(xfs_dir_leaf_entry_t));
+ }
+
+ if ((INT_GET(map->base, ARCH_CONVERT) + INT_GET(map->size, ARCH_CONVERT)) == INT_GET(entry->nameidx, ARCH_CONVERT)) {
+ before = i;
+ } else if (INT_GET(map->base, ARCH_CONVERT) == (INT_GET(entry->nameidx, ARCH_CONVERT) + entsize)) {
+ after = i;
+ } else if (INT_GET(map->size, ARCH_CONVERT) < tmp) {
+ tmp = INT_GET(map->size, ARCH_CONVERT);
+ smallest = i;
+ }
+ }
+
+ /*
+ * Coalesce adjacent freemap regions,
+ * or replace the smallest region.
+ */
+ if ((before >= 0) || (after >= 0)) {
+ if ((before >= 0) && (after >= 0)) {
+ map = &hdr->freemap[before];
+ INT_MOD(map->size, ARCH_CONVERT, entsize);
+ INT_MOD(map->size, ARCH_CONVERT, INT_GET(hdr->freemap[after].size, ARCH_CONVERT));
+ hdr->freemap[after].base = 0;
+ hdr->freemap[after].size = 0;
+ } else if (before >= 0) {
+ map = &hdr->freemap[before];
+ INT_MOD(map->size, ARCH_CONVERT, entsize);
+ } else {
+ map = &hdr->freemap[after];
+ INT_COPY(map->base, entry->nameidx, ARCH_CONVERT);
+ INT_MOD(map->size, ARCH_CONVERT, entsize);
+ }
+ } else {
+ /*
+ * Replace smallest region (if it is smaller than free'd entry)
+ */
+ map = &hdr->freemap[smallest];
+ if (INT_GET(map->size, ARCH_CONVERT) < entsize) {
+ INT_COPY(map->base, entry->nameidx, ARCH_CONVERT);
+ INT_SET(map->size, ARCH_CONVERT, entsize);
+ }
+ }
+
+ /*
+ * Did we remove the first entry?
+ */
+ if (INT_GET(entry->nameidx, ARCH_CONVERT) == INT_GET(hdr->firstused, ARCH_CONVERT))
+ smallest = 1;
+ else
+ smallest = 0;
+
+ /*
+ * Compress the remaining entries and zero out the removed stuff.
+ */
+ namest = XFS_DIR_LEAF_NAMESTRUCT(leaf, INT_GET(entry->nameidx, ARCH_CONVERT));
+ memset((char *)namest, 0, entsize);
+ xfs_da_log_buf(trans, bp, XFS_DA_LOGRANGE(leaf, namest, entsize));
+
+ INT_MOD(hdr->namebytes, ARCH_CONVERT, -(entry->namelen));
+ tmp = (INT_GET(hdr->count, ARCH_CONVERT) - index) * (uint)sizeof(xfs_dir_leaf_entry_t);
+ memmove(entry, entry + 1, tmp);
+ INT_MOD(hdr->count, ARCH_CONVERT, -1);
+ xfs_da_log_buf(trans, bp,
+ XFS_DA_LOGRANGE(leaf, entry, tmp + (uint)sizeof(*entry)));
+ entry = &leaf->entries[INT_GET(hdr->count, ARCH_CONVERT)];
+ memset((char *)entry, 0, sizeof(xfs_dir_leaf_entry_t));
+
+ /*
+ * If we removed the first entry, re-find the first used byte
+ * in the name area. Note that if the entry was the "firstused",
+ * then we don't have a "hole" in our block resulting from
+ * removing the name.
+ */
+ if (smallest) {
+ tmp = XFS_LBSIZE(mp);
+ entry = &leaf->entries[0];
+ for (i = INT_GET(hdr->count, ARCH_CONVERT)-1; i >= 0; entry++, i--) {
+ ASSERT(INT_GET(entry->nameidx, ARCH_CONVERT) >= INT_GET(hdr->firstused, ARCH_CONVERT));
+ ASSERT(INT_GET(entry->nameidx, ARCH_CONVERT) < XFS_LBSIZE(mp));
+ if (INT_GET(entry->nameidx, ARCH_CONVERT) < tmp)
+ tmp = INT_GET(entry->nameidx, ARCH_CONVERT);
+ }
+ INT_SET(hdr->firstused, ARCH_CONVERT, tmp);
+ if (!hdr->firstused)
+ INT_SET(hdr->firstused, ARCH_CONVERT, tmp - 1);
+ } else {
+ hdr->holes = 1; /* mark as needing compaction */
+ }
+
+ xfs_da_log_buf(trans, bp, XFS_DA_LOGRANGE(leaf, hdr, sizeof(*hdr)));
+
+ /*
+ * Check if leaf is less than 50% full, caller may want to
+ * "join" the leaf with a sibling if so.
+ */
+ tmp = (uint)sizeof(xfs_dir_leaf_hdr_t);
+ tmp += INT_GET(leaf->hdr.count, ARCH_CONVERT) * (uint)sizeof(xfs_dir_leaf_entry_t);
+ tmp += INT_GET(leaf->hdr.count, ARCH_CONVERT) * ((uint)sizeof(xfs_dir_leaf_name_t) - 1);
+ tmp += INT_GET(leaf->hdr.namebytes, ARCH_CONVERT);
+ if (tmp < mp->m_dir_magicpct)
+ return(1); /* leaf is < 37% full */
+ return(0);
+}
+
+/*
+ * Move all the directory entries from drop_leaf into save_leaf.
+ */
+void
+xfs_dir_leaf_unbalance(xfs_da_state_t *state, xfs_da_state_blk_t *drop_blk,
+ xfs_da_state_blk_t *save_blk)
+{
+ xfs_dir_leafblock_t *drop_leaf, *save_leaf, *tmp_leaf;
+ xfs_dir_leaf_hdr_t *drop_hdr, *save_hdr, *tmp_hdr;
+ xfs_mount_t *mp;
+ char *tmpbuffer;
+
+ /*
+ * Set up environment.
+ */
+ mp = state->mp;
+ ASSERT(drop_blk->magic == XFS_DIR_LEAF_MAGIC);
+ ASSERT(save_blk->magic == XFS_DIR_LEAF_MAGIC);
+ drop_leaf = drop_blk->bp->data;
+ save_leaf = save_blk->bp->data;
+ ASSERT(INT_GET(drop_leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
+ ASSERT(INT_GET(save_leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
+ drop_hdr = &drop_leaf->hdr;
+ save_hdr = &save_leaf->hdr;
+
+ /*
+ * Save last hashval from dying block for later Btree fixup.
+ */
+ drop_blk->hashval = INT_GET(drop_leaf->entries[ drop_leaf->hdr.count-1 ].hashval, ARCH_CONVERT);
+
+ /*
+ * Check if we need a temp buffer, or can we do it in place.
+ * Note that we don't check "leaf" for holes because we will
+ * always be dropping it, toosmall() decided that for us already.
+ */
+ if (save_hdr->holes == 0) {
+ /*
+ * dest leaf has no holes, so we add there. May need
+ * to make some room in the entry array.
+ */
+ if (xfs_dir_leaf_order(save_blk->bp, drop_blk->bp)) {
+ xfs_dir_leaf_moveents(drop_leaf, 0, save_leaf, 0,
+ (int)INT_GET(drop_hdr->count, ARCH_CONVERT), mp);
+ } else {
+ xfs_dir_leaf_moveents(drop_leaf, 0,
+ save_leaf, INT_GET(save_hdr->count, ARCH_CONVERT),
+ (int)INT_GET(drop_hdr->count, ARCH_CONVERT), mp);
+ }
+ } else {
+ /*
+ * Destination has holes, so we make a temporary copy
+ * of the leaf and add them both to that.
+ */
+ tmpbuffer = kmem_alloc(state->blocksize, KM_SLEEP);
+ ASSERT(tmpbuffer != NULL);
+ memset(tmpbuffer, 0, state->blocksize);
+ tmp_leaf = (xfs_dir_leafblock_t *)tmpbuffer;
+ tmp_hdr = &tmp_leaf->hdr;
+ tmp_hdr->info = save_hdr->info; /* struct copy */
+ tmp_hdr->count = 0;
+ INT_SET(tmp_hdr->firstused, ARCH_CONVERT, state->blocksize);
+ if (!tmp_hdr->firstused)
+ INT_SET(tmp_hdr->firstused, ARCH_CONVERT, state->blocksize - 1);
+ tmp_hdr->namebytes = 0;
+ if (xfs_dir_leaf_order(save_blk->bp, drop_blk->bp)) {
+ xfs_dir_leaf_moveents(drop_leaf, 0, tmp_leaf, 0,
+ (int)INT_GET(drop_hdr->count, ARCH_CONVERT), mp);
+ xfs_dir_leaf_moveents(save_leaf, 0,
+ tmp_leaf, INT_GET(tmp_leaf->hdr.count, ARCH_CONVERT),
+ (int)INT_GET(save_hdr->count, ARCH_CONVERT), mp);
+ } else {
+ xfs_dir_leaf_moveents(save_leaf, 0, tmp_leaf, 0,
+ (int)INT_GET(save_hdr->count, ARCH_CONVERT), mp);
+ xfs_dir_leaf_moveents(drop_leaf, 0,
+ tmp_leaf, INT_GET(tmp_leaf->hdr.count, ARCH_CONVERT),
+ (int)INT_GET(drop_hdr->count, ARCH_CONVERT), mp);
+ }
+ memcpy(save_leaf, tmp_leaf, state->blocksize);
+ kmem_free(tmpbuffer, state->blocksize);
+ }
+
+ xfs_da_log_buf(state->args->trans, save_blk->bp, 0,
+ state->blocksize - 1);
+
+ /*
+ * Copy out last hashval in each block for B-tree code.
+ */
+ save_blk->hashval = INT_GET(save_leaf->entries[ INT_GET(save_leaf->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT);
+}
+
+/*========================================================================
+ * Routines used for finding things in the Btree.
+ *========================================================================*/
+
+/*
+ * Look up a name in a leaf directory structure.
+ * This is the internal routine, it uses the caller's buffer.
+ *
+ * Note that duplicate keys are allowed, but only check within the
+ * current leaf node. The Btree code must check in adjacent leaf nodes.
+ *
+ * Return in *index the index into the entry[] array of either the found
+ * entry, or where the entry should have been (insert before that entry).
+ *
+ * Don't change the args->inumber unless we find the filename.
+ */
+int
+xfs_dir_leaf_lookup_int(xfs_dabuf_t *bp, xfs_da_args_t *args, int *index)
+{
+ xfs_dir_leafblock_t *leaf;
+ xfs_dir_leaf_entry_t *entry;
+ xfs_dir_leaf_name_t *namest;
+ int probe, span;
+ xfs_dahash_t hashval;
+
+ leaf = bp->data;
+ ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
+ ASSERT(INT_GET(leaf->hdr.count, ARCH_CONVERT) < (XFS_LBSIZE(args->dp->i_mount)/8));
+
+ /*
+ * Binary search. (note: small blocks will skip this loop)
+ */
+ hashval = args->hashval;
+ probe = span = INT_GET(leaf->hdr.count, ARCH_CONVERT) / 2;
+ for (entry = &leaf->entries[probe]; span > 4;
+ entry = &leaf->entries[probe]) {
+ span /= 2;
+ if (INT_GET(entry->hashval, ARCH_CONVERT) < hashval)
+ probe += span;
+ else if (INT_GET(entry->hashval, ARCH_CONVERT) > hashval)
+ probe -= span;
+ else
+ break;
+ }
+ ASSERT((probe >= 0) && \
+ ((!leaf->hdr.count) || (probe < INT_GET(leaf->hdr.count, ARCH_CONVERT))));
+ ASSERT((span <= 4) || (INT_GET(entry->hashval, ARCH_CONVERT) == hashval));
+
+ /*
+ * Since we may have duplicate hashval's, find the first matching
+ * hashval in the leaf.
+ */
+ while ((probe > 0) && (INT_GET(entry->hashval, ARCH_CONVERT) >= hashval)) {
+ entry--;
+ probe--;
+ }
+ while ((probe < INT_GET(leaf->hdr.count, ARCH_CONVERT)) && (INT_GET(entry->hashval, ARCH_CONVERT) < hashval)) {
+ entry++;
+ probe++;
+ }
+ if ((probe == INT_GET(leaf->hdr.count, ARCH_CONVERT)) || (INT_GET(entry->hashval, ARCH_CONVERT) != hashval)) {
+ *index = probe;
+ ASSERT(args->oknoent);
+ return(XFS_ERROR(ENOENT));
+ }
+
+ /*
+ * Duplicate keys may be present, so search all of them for a match.
+ */
+ while ((probe < INT_GET(leaf->hdr.count, ARCH_CONVERT)) && (INT_GET(entry->hashval, ARCH_CONVERT) == hashval)) {
+ namest = XFS_DIR_LEAF_NAMESTRUCT(leaf, INT_GET(entry->nameidx, ARCH_CONVERT));
+ if (entry->namelen == args->namelen &&
+ namest->name[0] == args->name[0] &&
+ memcmp(args->name, namest->name, args->namelen) == 0) {
+ XFS_DIR_SF_GET_DIRINO(&namest->inumber, &args->inumber);
+ *index = probe;
+ return(XFS_ERROR(EEXIST));
+ }
+ entry++;
+ probe++;
+ }
+ *index = probe;
+ ASSERT(probe == INT_GET(leaf->hdr.count, ARCH_CONVERT) || args->oknoent);
+ return(XFS_ERROR(ENOENT));
+}
+
+/*========================================================================
+ * Utility routines.
+ *========================================================================*/
+
+/*
+ * Move the indicated entries from one leaf to another.
+ * NOTE: this routine modifies both source and destination leaves.
+ */
+/* ARGSUSED */
+STATIC void
+xfs_dir_leaf_moveents(xfs_dir_leafblock_t *leaf_s, int start_s,
+ xfs_dir_leafblock_t *leaf_d, int start_d,
+ int count, xfs_mount_t *mp)
+{
+ xfs_dir_leaf_hdr_t *hdr_s, *hdr_d;
+ xfs_dir_leaf_entry_t *entry_s, *entry_d;
+ int tmp, i;
+
+ /*
+ * Check for nothing to do.
+ */
+ if (count == 0)
+ return;
+
+ /*
+ * Set up environment.
+ */
+ ASSERT(INT_GET(leaf_s->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
+ ASSERT(INT_GET(leaf_d->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
+ hdr_s = &leaf_s->hdr;
+ hdr_d = &leaf_d->hdr;
+ ASSERT((INT_GET(hdr_s->count, ARCH_CONVERT) > 0) && (INT_GET(hdr_s->count, ARCH_CONVERT) < (XFS_LBSIZE(mp)/8)));
+ ASSERT(INT_GET(hdr_s->firstused, ARCH_CONVERT) >=
+ ((INT_GET(hdr_s->count, ARCH_CONVERT)*sizeof(*entry_s))+sizeof(*hdr_s)));
+ ASSERT(INT_GET(hdr_d->count, ARCH_CONVERT) < (XFS_LBSIZE(mp)/8));
+ ASSERT(INT_GET(hdr_d->firstused, ARCH_CONVERT) >=
+ ((INT_GET(hdr_d->count, ARCH_CONVERT)*sizeof(*entry_d))+sizeof(*hdr_d)));
+
+ ASSERT(start_s < INT_GET(hdr_s->count, ARCH_CONVERT));
+ ASSERT(start_d <= INT_GET(hdr_d->count, ARCH_CONVERT));
+ ASSERT(count <= INT_GET(hdr_s->count, ARCH_CONVERT));
+
+ /*
+ * Move the entries in the destination leaf up to make a hole?
+ */
+ if (start_d < INT_GET(hdr_d->count, ARCH_CONVERT)) {
+ tmp = INT_GET(hdr_d->count, ARCH_CONVERT) - start_d;
+ tmp *= (uint)sizeof(xfs_dir_leaf_entry_t);
+ entry_s = &leaf_d->entries[start_d];
+ entry_d = &leaf_d->entries[start_d + count];
+ memcpy(entry_d, entry_s, tmp);
+ }
+
+ /*
+ * Copy all entry's in the same (sorted) order,
+ * but allocate filenames packed and in sequence.
+ */
+ entry_s = &leaf_s->entries[start_s];
+ entry_d = &leaf_d->entries[start_d];
+ for (i = 0; i < count; entry_s++, entry_d++, i++) {
+ ASSERT(INT_GET(entry_s->nameidx, ARCH_CONVERT) >= INT_GET(hdr_s->firstused, ARCH_CONVERT));
+ tmp = XFS_DIR_LEAF_ENTSIZE_BYENTRY(entry_s);
+ INT_MOD(hdr_d->firstused, ARCH_CONVERT, -(tmp));
+ entry_d->hashval = entry_s->hashval; /* INT_: direct copy */
+ INT_COPY(entry_d->nameidx, hdr_d->firstused, ARCH_CONVERT);
+ entry_d->namelen = entry_s->namelen;
+ ASSERT(INT_GET(entry_d->nameidx, ARCH_CONVERT) + tmp <= XFS_LBSIZE(mp));
+ memcpy(XFS_DIR_LEAF_NAMESTRUCT(leaf_d, INT_GET(entry_d->nameidx, ARCH_CONVERT)),
+ XFS_DIR_LEAF_NAMESTRUCT(leaf_s, INT_GET(entry_s->nameidx, ARCH_CONVERT)), tmp);
+ ASSERT(INT_GET(entry_s->nameidx, ARCH_CONVERT) + tmp <= XFS_LBSIZE(mp));
+ memset((char *)XFS_DIR_LEAF_NAMESTRUCT(leaf_s, INT_GET(entry_s->nameidx, ARCH_CONVERT)),
+ 0, tmp);
+ INT_MOD(hdr_s->namebytes, ARCH_CONVERT, -(entry_d->namelen));
+ INT_MOD(hdr_d->namebytes, ARCH_CONVERT, entry_d->namelen);
+ INT_MOD(hdr_s->count, ARCH_CONVERT, -1);
+ INT_MOD(hdr_d->count, ARCH_CONVERT, +1);
+ tmp = INT_GET(hdr_d->count, ARCH_CONVERT) * (uint)sizeof(xfs_dir_leaf_entry_t)
+ + (uint)sizeof(xfs_dir_leaf_hdr_t);
+ ASSERT(INT_GET(hdr_d->firstused, ARCH_CONVERT) >= tmp);
+
+ }
+
+ /*
+ * Zero out the entries we just copied.
+ */
+ if (start_s == INT_GET(hdr_s->count, ARCH_CONVERT)) {
+ tmp = count * (uint)sizeof(xfs_dir_leaf_entry_t);
+ entry_s = &leaf_s->entries[start_s];
+ ASSERT((char *)entry_s + tmp <= (char *)leaf_s + XFS_LBSIZE(mp));
+ memset((char *)entry_s, 0, tmp);
+ } else {
+ /*
+ * Move the remaining entries down to fill the hole,
+ * then zero the entries at the top.
+ */
+ tmp = INT_GET(hdr_s->count, ARCH_CONVERT) - count;
+ tmp *= (uint)sizeof(xfs_dir_leaf_entry_t);
+ entry_s = &leaf_s->entries[start_s + count];
+ entry_d = &leaf_s->entries[start_s];
+ memcpy(entry_d, entry_s, tmp);
+
+ tmp = count * (uint)sizeof(xfs_dir_leaf_entry_t);
+ entry_s = &leaf_s->entries[INT_GET(hdr_s->count, ARCH_CONVERT)];
+ ASSERT((char *)entry_s + tmp <= (char *)leaf_s + XFS_LBSIZE(mp));
+ memset((char *)entry_s, 0, tmp);
+ }
+
+ /*
+ * Fill in the freemap information
+ */
+ INT_SET(hdr_d->freemap[0].base, ARCH_CONVERT, (uint)sizeof(xfs_dir_leaf_hdr_t));
+ INT_MOD(hdr_d->freemap[0].base, ARCH_CONVERT, INT_GET(hdr_d->count, ARCH_CONVERT) * (uint)sizeof(xfs_dir_leaf_entry_t));
+ INT_SET(hdr_d->freemap[0].size, ARCH_CONVERT, INT_GET(hdr_d->firstused, ARCH_CONVERT) - INT_GET(hdr_d->freemap[0].base, ARCH_CONVERT));
+ INT_SET(hdr_d->freemap[1].base, ARCH_CONVERT, (hdr_d->freemap[2].base = 0));
+ INT_SET(hdr_d->freemap[1].size, ARCH_CONVERT, (hdr_d->freemap[2].size = 0));
+ hdr_s->holes = 1; /* leaf may not be compact */
+}
+
+/*
+ * Compare two leaf blocks "order".
+ */
+int
+xfs_dir_leaf_order(xfs_dabuf_t *leaf1_bp, xfs_dabuf_t *leaf2_bp)
+{
+ xfs_dir_leafblock_t *leaf1, *leaf2;
+
+ leaf1 = leaf1_bp->data;
+ leaf2 = leaf2_bp->data;
+ ASSERT((INT_GET(leaf1->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC) &&
+ (INT_GET(leaf2->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC));
+ if ((INT_GET(leaf1->hdr.count, ARCH_CONVERT) > 0) && (INT_GET(leaf2->hdr.count, ARCH_CONVERT) > 0) &&
+ ((INT_GET(leaf2->entries[ 0 ].hashval, ARCH_CONVERT) <
+ INT_GET(leaf1->entries[ 0 ].hashval, ARCH_CONVERT)) ||
+ (INT_GET(leaf2->entries[ INT_GET(leaf2->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT) <
+ INT_GET(leaf1->entries[ INT_GET(leaf1->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT)))) {
+ return(1);
+ }
+ return(0);
+}
+
+/*
+ * Pick up the last hashvalue from a leaf block.
+ */
+xfs_dahash_t
+xfs_dir_leaf_lasthash(xfs_dabuf_t *bp, int *count)
+{
+ xfs_dir_leafblock_t *leaf;
+
+ leaf = bp->data;
+ ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
+ if (count)
+ *count = INT_GET(leaf->hdr.count, ARCH_CONVERT);
+ if (!leaf->hdr.count)
+ return(0);
+ return(INT_GET(leaf->entries[ INT_GET(leaf->hdr.count, ARCH_CONVERT)-1 ].hashval, ARCH_CONVERT));
+}
+
+/*
+ * Copy out directory entries for getdents(), for leaf directories.
+ */
+int
+xfs_dir_leaf_getdents_int(
+ xfs_dabuf_t *bp,
+ xfs_inode_t *dp,
+ xfs_dablk_t bno,
+ uio_t *uio,
+ int *eobp,
+ xfs_dirent_t *dbp,
+ xfs_dir_put_t put,
+ xfs_daddr_t nextda)
+{
+ xfs_dir_leafblock_t *leaf;
+ xfs_dir_leaf_entry_t *entry;
+ xfs_dir_leaf_name_t *namest;
+ int entno, want_entno, i, nextentno;
+ xfs_mount_t *mp;
+ xfs_dahash_t cookhash;
+ xfs_dahash_t nexthash = 0;
+#if (BITS_PER_LONG == 32)
+ xfs_dahash_t lasthash = XFS_DA_MAXHASH;
+#endif
+ xfs_dir_put_args_t p;
+
+ mp = dp->i_mount;
+ leaf = bp->data;
+ if (INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) != XFS_DIR_LEAF_MAGIC) {
+ *eobp = 1;
+ return(XFS_ERROR(ENOENT)); /* XXX wrong code */
+ }
+
+ want_entno = XFS_DA_COOKIE_ENTRY(mp, uio->uio_offset);
+
+ cookhash = XFS_DA_COOKIE_HASH(mp, uio->uio_offset);
+
+ xfs_dir_trace_g_dul("leaf: start", dp, uio, leaf);
+
+ /*
+ * Re-find our place.
+ */
+ for (i = entno = 0, entry = &leaf->entries[0];
+ i < INT_GET(leaf->hdr.count, ARCH_CONVERT);
+ entry++, i++) {
+
+ namest = XFS_DIR_LEAF_NAMESTRUCT(leaf,
+ INT_GET(entry->nameidx, ARCH_CONVERT));
+
+ if (unlikely(
+ ((char *)namest < (char *)leaf) ||
+ ((char *)namest >= (char *)leaf + XFS_LBSIZE(mp)))) {
+ XFS_CORRUPTION_ERROR("xfs_dir_leaf_getdents_int(1)",
+ XFS_ERRLEVEL_LOW, mp, leaf);
+ xfs_dir_trace_g_du("leaf: corrupted", dp, uio);
+ return XFS_ERROR(EFSCORRUPTED);
+ }
+ if (INT_GET(entry->hashval, ARCH_CONVERT) >= cookhash) {
+ if ( entno < want_entno
+ && INT_GET(entry->hashval, ARCH_CONVERT)
+ == cookhash) {
+ /*
+ * Trying to get to a particular offset in a
+ * run of equal-hashval entries.
+ */
+ entno++;
+ } else if ( want_entno > 0
+ && entno == want_entno
+ && INT_GET(entry->hashval, ARCH_CONVERT)
+ == cookhash) {
+ break;
+ } else {
+ entno = 0;
+ break;
+ }
+ }
+ }
+
+ if (i == INT_GET(leaf->hdr.count, ARCH_CONVERT)) {
+ xfs_dir_trace_g_du("leaf: hash not found", dp, uio);
+ if (!INT_GET(leaf->hdr.info.forw, ARCH_CONVERT))
+ uio->uio_offset =
+ XFS_DA_MAKE_COOKIE(mp, 0, 0, XFS_DA_MAXHASH);
+ /*
+ * Don't set uio_offset if there's another block:
+ * the node code will be setting uio_offset anyway.
+ */
+ *eobp = 0;
+ return(0);
+ }
+ xfs_dir_trace_g_due("leaf: hash found", dp, uio, entry);
+
+ p.dbp = dbp;
+ p.put = put;
+ p.uio = uio;
+
+ /*
+ * We're synchronized, start copying entries out to the user.
+ */
+ for (; entno >= 0 && i < INT_GET(leaf->hdr.count, ARCH_CONVERT);
+ entry++, i++, (entno = nextentno)) {
+ int lastresid=0, retval;
+ xfs_dircook_t lastoffset;
+ xfs_dahash_t thishash;
+
+ /*
+ * Check for a damaged directory leaf block and pick up
+ * the inode number from this entry.
+ */
+ namest = XFS_DIR_LEAF_NAMESTRUCT(leaf,
+ INT_GET(entry->nameidx, ARCH_CONVERT));
+
+ if (unlikely(
+ ((char *)namest < (char *)leaf) ||
+ ((char *)namest >= (char *)leaf + XFS_LBSIZE(mp)))) {
+ XFS_CORRUPTION_ERROR("xfs_dir_leaf_getdents_int(2)",
+ XFS_ERRLEVEL_LOW, mp, leaf);
+ xfs_dir_trace_g_du("leaf: corrupted", dp, uio);
+ return XFS_ERROR(EFSCORRUPTED);
+ }
+
+ xfs_dir_trace_g_duc("leaf: middle cookie ",
+ dp, uio, p.cook.o);
+
+ if (i < (INT_GET(leaf->hdr.count, ARCH_CONVERT) - 1)) {
+ nexthash = INT_GET(entry[1].hashval, ARCH_CONVERT);
+
+ if (nexthash == INT_GET(entry->hashval, ARCH_CONVERT))
+ nextentno = entno + 1;
+ else
+ nextentno = 0;
+ XFS_PUT_COOKIE(p.cook, mp, bno, nextentno, nexthash);
+ xfs_dir_trace_g_duc("leaf: middle cookie ",
+ dp, uio, p.cook.o);
+
+ } else if ((thishash = INT_GET(leaf->hdr.info.forw,
+ ARCH_CONVERT))) {
+ xfs_dabuf_t *bp2;
+ xfs_dir_leafblock_t *leaf2;
+
+ ASSERT(nextda != -1);
+
+ retval = xfs_da_read_buf(dp->i_transp, dp, thishash,
+ nextda, &bp2, XFS_DATA_FORK);
+ if (retval)
+ return(retval);
+
+ ASSERT(bp2 != NULL);
+
+ leaf2 = bp2->data;
+
+ if (unlikely(
+ (INT_GET(leaf2->hdr.info.magic, ARCH_CONVERT)
+ != XFS_DIR_LEAF_MAGIC)
+ || (INT_GET(leaf2->hdr.info.back, ARCH_CONVERT)
+ != bno))) { /* GROT */
+ XFS_CORRUPTION_ERROR("xfs_dir_leaf_getdents_int(3)",
+ XFS_ERRLEVEL_LOW, mp,
+ leaf2);
+ xfs_da_brelse(dp->i_transp, bp2);
+
+ return(XFS_ERROR(EFSCORRUPTED));
+ }
+
+ nexthash = INT_GET(leaf2->entries[0].hashval,
+ ARCH_CONVERT);
+ nextentno = -1;
+ XFS_PUT_COOKIE(p.cook, mp, thishash, 0, nexthash);
+ xfs_da_brelse(dp->i_transp, bp2);
+ xfs_dir_trace_g_duc("leaf: next blk cookie",
+ dp, uio, p.cook.o);
+ } else {
+ nextentno = -1;
+ XFS_PUT_COOKIE(p.cook, mp, 0, 0, XFS_DA_MAXHASH);
+ }
+
+ /*
+ * Save off the cookie so we can fall back should the
+ * 'put' into the outgoing buffer fails. To handle a run
+ * of equal-hashvals, the off_t structure on 64bit
+ * builds has entno built into the cookie to ID the
+ * entry. On 32bit builds, we only have space for the
+ * hashval so we can't ID specific entries within a group
+ * of same hashval entries. For this, lastoffset is set
+ * to the first in the run of equal hashvals so we don't
+ * include any entries unless we can include all entries
+ * that share the same hashval. Hopefully the buffer
+ * provided is big enough to handle it (see pv763517).
+ */
+#if (BITS_PER_LONG == 32)
+ if ((thishash = INT_GET(entry->hashval, ARCH_CONVERT))
+ != lasthash) {
+ XFS_PUT_COOKIE(lastoffset, mp, bno, entno, thishash);
+ lastresid = uio->uio_resid;
+ lasthash = thishash;
+ } else {
+ xfs_dir_trace_g_duc("leaf: DUP COOKIES, skipped",
+ dp, uio, p.cook.o);
+ }
+#else
+ thishash = INT_GET(entry->hashval, ARCH_CONVERT);
+ XFS_PUT_COOKIE(lastoffset, mp, bno, entno, thishash);
+ lastresid = uio->uio_resid;
+#endif /* BITS_PER_LONG == 32 */
+
+ /*
+ * Put the current entry into the outgoing buffer. If we fail
+ * then restore the UIO to the first entry in the current
+ * run of equal-hashval entries (probably one 1 entry long).
+ */
+ p.ino = XFS_GET_DIR_INO8(namest->inumber);
+#if XFS_BIG_INUMS
+ p.ino += mp->m_inoadd;
+#endif
+ p.name = (char *)namest->name;
+ p.namelen = entry->namelen;
+
+ retval = p.put(&p);
+
+ if (!p.done) {
+ uio->uio_offset = lastoffset.o;
+ uio->uio_resid = lastresid;
+
+ *eobp = 1;
+
+ xfs_dir_trace_g_du("leaf: E-O-B", dp, uio);
+
+ return(retval);
+ }
+ }
+
+ uio->uio_offset = p.cook.o;
+
+ *eobp = 0;
+
+ xfs_dir_trace_g_du("leaf: E-O-F", dp, uio);
+
+ return(0);
+}
+
+/*
+ * Format a dirent64 structure and copy it out the the user's buffer.
+ */
+int
+xfs_dir_put_dirent64_direct(xfs_dir_put_args_t *pa)
+{
+ iovec_t *iovp;
+ int reclen, namelen;
+ xfs_dirent_t *idbp;
+ uio_t *uio;
+
+ namelen = pa->namelen;
+ reclen = DIRENTSIZE(namelen);
+ uio = pa->uio;
+ if (reclen > uio->uio_resid) {
+ pa->done = 0;
+ return 0;
+ }
+ iovp = uio->uio_iov;
+ idbp = (xfs_dirent_t *)iovp->iov_base;
+ iovp->iov_base = (char *)idbp + reclen;
+ iovp->iov_len -= reclen;
+ uio->uio_resid -= reclen;
+ idbp->d_reclen = reclen;
+ idbp->d_ino = pa->ino;
+ idbp->d_off = pa->cook.o;
+ idbp->d_name[namelen] = '\0';
+ pa->done = 1;
+ memcpy(idbp->d_name, pa->name, namelen);
+ return 0;
+}
+
+/*
+ * Format a dirent64 structure and copy it out the the user's buffer.
+ */
+int
+xfs_dir_put_dirent64_uio(xfs_dir_put_args_t *pa)
+{
+ int retval, reclen, namelen;
+ xfs_dirent_t *idbp;
+ uio_t *uio;
+
+ namelen = pa->namelen;
+ reclen = DIRENTSIZE(namelen);
+ uio = pa->uio;
+ if (reclen > uio->uio_resid) {
+ pa->done = 0;
+ return 0;
+ }
+ idbp = pa->dbp;
+ idbp->d_reclen = reclen;
+ idbp->d_ino = pa->ino;
+ idbp->d_off = pa->cook.o;
+ idbp->d_name[namelen] = '\0';
+ memcpy(idbp->d_name, pa->name, namelen);
+ retval = uio_read((caddr_t)idbp, reclen, uio);
+ pa->done = (retval == 0);
+ return retval;
+}