patch-2.4.25 linux-2.4.25/fs/xfs/xfs_dir.c
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- Lines: 1224
- Date:
2004-02-18 05:36:32.000000000 -0800
- Orig file:
linux-2.4.24/fs/xfs/xfs_dir.c
- Orig date:
1969-12-31 16:00:00.000000000 -0800
diff -urN linux-2.4.24/fs/xfs/xfs_dir.c linux-2.4.25/fs/xfs/xfs_dir.c
@@ -0,0 +1,1223 @@
+/*
+ * Copyright (c) 2000-2001 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/
+ */
+
+#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.h"
+#include "xfs_bmap.h"
+#include "xfs_da_btree.h"
+#include "xfs_dir_leaf.h"
+#include "xfs_error.h"
+
+/*
+ * xfs_dir.c
+ *
+ * Provide the external interfaces to manage directories.
+ */
+
+/*========================================================================
+ * Function prototypes for the kernel.
+ *========================================================================*/
+
+/*
+ * Functions for the dirops interfaces.
+ */
+static void xfs_dir_mount(struct xfs_mount *mp);
+
+static int xfs_dir_isempty(struct xfs_inode *dp);
+
+static int xfs_dir_init(struct xfs_trans *trans,
+ struct xfs_inode *dir,
+ struct xfs_inode *parent_dir);
+
+static int xfs_dir_createname(struct xfs_trans *trans,
+ struct xfs_inode *dp,
+ char *name_string,
+ int name_len,
+ xfs_ino_t inode_number,
+ xfs_fsblock_t *firstblock,
+ xfs_bmap_free_t *flist,
+ xfs_extlen_t total);
+
+static int xfs_dir_lookup(struct xfs_trans *tp,
+ struct xfs_inode *dp,
+ char *name_string,
+ int name_length,
+ xfs_ino_t *inode_number);
+
+static int xfs_dir_removename(struct xfs_trans *trans,
+ struct xfs_inode *dp,
+ char *name_string,
+ int name_length,
+ xfs_ino_t ino,
+ xfs_fsblock_t *firstblock,
+ xfs_bmap_free_t *flist,
+ xfs_extlen_t total);
+
+static int xfs_dir_getdents(struct xfs_trans *tp,
+ struct xfs_inode *dp,
+ struct uio *uiop,
+ int *eofp);
+
+static int xfs_dir_replace(struct xfs_trans *tp,
+ struct xfs_inode *dp,
+ char *name_string,
+ int name_length,
+ xfs_ino_t inode_number,
+ xfs_fsblock_t *firstblock,
+ xfs_bmap_free_t *flist,
+ xfs_extlen_t total);
+
+static int xfs_dir_canenter(struct xfs_trans *tp,
+ struct xfs_inode *dp,
+ char *name_string,
+ int name_length);
+
+static int xfs_dir_shortform_validate_ondisk(xfs_mount_t *mp,
+ xfs_dinode_t *dip);
+
+xfs_dirops_t xfsv1_dirops = {
+ .xd_mount = xfs_dir_mount,
+ .xd_isempty = xfs_dir_isempty,
+ .xd_init = xfs_dir_init,
+ .xd_createname = xfs_dir_createname,
+ .xd_lookup = xfs_dir_lookup,
+ .xd_removename = xfs_dir_removename,
+ .xd_getdents = xfs_dir_getdents,
+ .xd_replace = xfs_dir_replace,
+ .xd_canenter = xfs_dir_canenter,
+ .xd_shortform_validate_ondisk = xfs_dir_shortform_validate_ondisk,
+ .xd_shortform_to_single = xfs_dir_shortform_to_leaf,
+};
+
+/*
+ * Internal routines when dirsize == XFS_LBSIZE(mp).
+ */
+STATIC int xfs_dir_leaf_lookup(xfs_da_args_t *args);
+STATIC int xfs_dir_leaf_removename(xfs_da_args_t *args, int *number_entries,
+ int *total_namebytes);
+STATIC int xfs_dir_leaf_getdents(xfs_trans_t *trans, xfs_inode_t *dp,
+ uio_t *uio, int *eofp,
+ xfs_dirent_t *dbp,
+ xfs_dir_put_t put);
+STATIC int xfs_dir_leaf_replace(xfs_da_args_t *args);
+
+/*
+ * Internal routines when dirsize > XFS_LBSIZE(mp).
+ */
+STATIC int xfs_dir_node_addname(xfs_da_args_t *args);
+STATIC int xfs_dir_node_lookup(xfs_da_args_t *args);
+STATIC int xfs_dir_node_removename(xfs_da_args_t *args);
+STATIC int xfs_dir_node_getdents(xfs_trans_t *trans, xfs_inode_t *dp,
+ uio_t *uio, int *eofp,
+ xfs_dirent_t *dbp,
+ xfs_dir_put_t put);
+STATIC int xfs_dir_node_replace(xfs_da_args_t *args);
+
+#if defined(XFS_DIR_TRACE)
+ktrace_t *xfs_dir_trace_buf;
+#endif
+
+
+/*========================================================================
+ * Overall external interface routines.
+ *========================================================================*/
+
+xfs_dahash_t xfs_dir_hash_dot, xfs_dir_hash_dotdot;
+
+/*
+ * One-time startup routine called from xfs_init().
+ */
+void
+xfs_dir_startup(void)
+{
+ xfs_dir_hash_dot = xfs_da_hashname(".", 1);
+ xfs_dir_hash_dotdot = xfs_da_hashname("..", 2);
+}
+
+/*
+ * Initialize directory-related fields in the mount structure.
+ */
+static void
+xfs_dir_mount(xfs_mount_t *mp)
+{
+ uint shortcount, leafcount, count;
+
+ mp->m_dirversion = 1;
+ shortcount = (mp->m_attroffset - (uint)sizeof(xfs_dir_sf_hdr_t)) /
+ (uint)sizeof(xfs_dir_sf_entry_t);
+ leafcount = (XFS_LBSIZE(mp) - (uint)sizeof(xfs_dir_leaf_hdr_t)) /
+ ((uint)sizeof(xfs_dir_leaf_entry_t) +
+ (uint)sizeof(xfs_dir_leaf_name_t));
+ count = shortcount > leafcount ? shortcount : leafcount;
+ mp->m_dircook_elog = xfs_da_log2_roundup(count + 1);
+ ASSERT(mp->m_dircook_elog <= mp->m_sb.sb_blocklog);
+ mp->m_dir_node_ents = mp->m_attr_node_ents =
+ (XFS_LBSIZE(mp) - (uint)sizeof(xfs_da_node_hdr_t)) /
+ (uint)sizeof(xfs_da_node_entry_t);
+ mp->m_dir_magicpct = (XFS_LBSIZE(mp) * 37) / 100;
+ mp->m_dirblksize = mp->m_sb.sb_blocksize;
+ mp->m_dirblkfsbs = 1;
+}
+
+/*
+ * Return 1 if directory contains only "." and "..".
+ */
+static int
+xfs_dir_isempty(xfs_inode_t *dp)
+{
+ xfs_dir_sf_hdr_t *hdr;
+
+ ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
+ if (dp->i_d.di_size == 0)
+ return(1);
+ if (dp->i_d.di_size > XFS_IFORK_DSIZE(dp))
+ return(0);
+ hdr = (xfs_dir_sf_hdr_t *)dp->i_df.if_u1.if_data;
+ return(hdr->count == 0);
+}
+
+/*
+ * Initialize a directory with its "." and ".." entries.
+ */
+static int
+xfs_dir_init(xfs_trans_t *trans, xfs_inode_t *dir, xfs_inode_t *parent_dir)
+{
+ xfs_da_args_t args;
+ int error;
+
+ memset((char *)&args, 0, sizeof(args));
+ args.dp = dir;
+ args.trans = trans;
+
+ ASSERT((dir->i_d.di_mode & S_IFMT) == S_IFDIR);
+ if ((error = xfs_dir_ino_validate(trans->t_mountp, parent_dir->i_ino)))
+ return error;
+
+ return(xfs_dir_shortform_create(&args, parent_dir->i_ino));
+}
+
+/*
+ * Generic handler routine to add a name to a directory.
+ * Transitions directory from shortform to Btree as necessary.
+ */
+static int /* error */
+xfs_dir_createname(xfs_trans_t *trans, xfs_inode_t *dp, char *name,
+ int namelen, xfs_ino_t inum, xfs_fsblock_t *firstblock,
+ xfs_bmap_free_t *flist, xfs_extlen_t total)
+{
+ xfs_da_args_t args;
+ int retval, newsize, done;
+
+ ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
+
+ if ((retval = xfs_dir_ino_validate(trans->t_mountp, inum)))
+ return (retval);
+
+ XFS_STATS_INC(xs_dir_create);
+ /*
+ * Fill in the arg structure for this request.
+ */
+ args.name = name;
+ args.namelen = namelen;
+ args.hashval = xfs_da_hashname(name, namelen);
+ args.inumber = inum;
+ args.dp = dp;
+ args.firstblock = firstblock;
+ args.flist = flist;
+ args.total = total;
+ args.whichfork = XFS_DATA_FORK;
+ args.trans = trans;
+ args.justcheck = 0;
+ args.addname = args.oknoent = 1;
+
+ /*
+ * Decide on what work routines to call based on the inode size.
+ */
+ done = 0;
+ if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
+ newsize = XFS_DIR_SF_ENTSIZE_BYNAME(args.namelen);
+ if ((dp->i_d.di_size + newsize) <= XFS_IFORK_DSIZE(dp)) {
+ retval = xfs_dir_shortform_addname(&args);
+ done = 1;
+ } else {
+ if (total == 0)
+ return XFS_ERROR(ENOSPC);
+ retval = xfs_dir_shortform_to_leaf(&args);
+ done = retval != 0;
+ }
+ }
+ if (!done && xfs_bmap_one_block(dp, XFS_DATA_FORK)) {
+ retval = xfs_dir_leaf_addname(&args);
+ done = retval != ENOSPC;
+ if (!done) {
+ if (total == 0)
+ return XFS_ERROR(ENOSPC);
+ retval = xfs_dir_leaf_to_node(&args);
+ done = retval != 0;
+ }
+ }
+ if (!done) {
+ retval = xfs_dir_node_addname(&args);
+ }
+ return(retval);
+}
+
+/*
+ * Generic handler routine to check if a name can be added to a directory,
+ * without adding any blocks to the directory.
+ */
+static int /* error */
+xfs_dir_canenter(xfs_trans_t *trans, xfs_inode_t *dp, char *name, int namelen)
+{
+ xfs_da_args_t args;
+ int retval, newsize;
+
+ ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
+ /*
+ * Fill in the arg structure for this request.
+ */
+ args.name = name;
+ args.namelen = namelen;
+ args.hashval = xfs_da_hashname(name, namelen);
+ args.inumber = 0;
+ args.dp = dp;
+ args.firstblock = NULL;
+ args.flist = NULL;
+ args.total = 0;
+ args.whichfork = XFS_DATA_FORK;
+ args.trans = trans;
+ args.justcheck = args.addname = args.oknoent = 1;
+
+ /*
+ * Decide on what work routines to call based on the inode size.
+ */
+ if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
+ newsize = XFS_DIR_SF_ENTSIZE_BYNAME(args.namelen);
+ if ((dp->i_d.di_size + newsize) <= XFS_IFORK_DSIZE(dp))
+ retval = 0;
+ else
+ retval = XFS_ERROR(ENOSPC);
+ } else if (xfs_bmap_one_block(dp, XFS_DATA_FORK)) {
+ retval = xfs_dir_leaf_addname(&args);
+ } else {
+ retval = xfs_dir_node_addname(&args);
+ }
+ return(retval);
+}
+
+/*
+ * Generic handler routine to remove a name from a directory.
+ * Transitions directory from Btree to shortform as necessary.
+ */
+static int /* error */
+xfs_dir_removename(xfs_trans_t *trans, xfs_inode_t *dp, char *name,
+ int namelen, xfs_ino_t ino, xfs_fsblock_t *firstblock,
+ xfs_bmap_free_t *flist, xfs_extlen_t total)
+{
+ xfs_da_args_t args;
+ int count, totallen, newsize, retval;
+
+ ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
+ XFS_STATS_INC(xs_dir_remove);
+ /*
+ * Fill in the arg structure for this request.
+ */
+ args.name = name;
+ args.namelen = namelen;
+ args.hashval = xfs_da_hashname(name, namelen);
+ args.inumber = ino;
+ args.dp = dp;
+ args.firstblock = firstblock;
+ args.flist = flist;
+ args.total = total;
+ args.whichfork = XFS_DATA_FORK;
+ args.trans = trans;
+ args.justcheck = args.addname = args.oknoent = 0;
+
+ /*
+ * Decide on what work routines to call based on the inode size.
+ */
+ if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
+ retval = xfs_dir_shortform_removename(&args);
+ } else if (xfs_bmap_one_block(dp, XFS_DATA_FORK)) {
+ retval = xfs_dir_leaf_removename(&args, &count, &totallen);
+ if (retval == 0) {
+ newsize = XFS_DIR_SF_ALLFIT(count, totallen);
+ if (newsize <= XFS_IFORK_DSIZE(dp)) {
+ retval = xfs_dir_leaf_to_shortform(&args);
+ }
+ }
+ } else {
+ retval = xfs_dir_node_removename(&args);
+ }
+ return(retval);
+}
+
+static int /* error */
+xfs_dir_lookup(xfs_trans_t *trans, xfs_inode_t *dp, char *name, int namelen,
+ xfs_ino_t *inum)
+{
+ xfs_da_args_t args;
+ int retval;
+
+ ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
+
+ XFS_STATS_INC(xs_dir_lookup);
+ /*
+ * Fill in the arg structure for this request.
+ */
+ args.name = name;
+ args.namelen = namelen;
+ args.hashval = xfs_da_hashname(name, namelen);
+ args.inumber = 0;
+ args.dp = dp;
+ args.firstblock = NULL;
+ args.flist = NULL;
+ args.total = 0;
+ args.whichfork = XFS_DATA_FORK;
+ args.trans = trans;
+ args.justcheck = args.addname = 0;
+ args.oknoent = 1;
+
+ /*
+ * Decide on what work routines to call based on the inode size.
+ */
+ if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
+ retval = xfs_dir_shortform_lookup(&args);
+ } else if (xfs_bmap_one_block(dp, XFS_DATA_FORK)) {
+ retval = xfs_dir_leaf_lookup(&args);
+ } else {
+ retval = xfs_dir_node_lookup(&args);
+ }
+ if (retval == EEXIST)
+ retval = 0;
+ *inum = args.inumber;
+ return(retval);
+}
+
+/*
+ * Implement readdir.
+ */
+static int /* error */
+xfs_dir_getdents(xfs_trans_t *trans, xfs_inode_t *dp, uio_t *uio, int *eofp)
+{
+ xfs_dirent_t *dbp;
+ int alignment, retval;
+ xfs_dir_put_t put;
+
+ XFS_STATS_INC(xs_dir_getdents);
+ ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
+
+ /*
+ * If our caller has given us a single contiguous memory buffer,
+ * just work directly within that buffer. If it's in user memory,
+ * lock it down first.
+ */
+ alignment = sizeof(xfs_off_t) - 1;
+ if ((uio->uio_iovcnt == 1) &&
+ (((__psint_t)uio->uio_iov[0].iov_base & alignment) == 0) &&
+ ((uio->uio_iov[0].iov_len & alignment) == 0)) {
+ dbp = NULL;
+ put = xfs_dir_put_dirent64_direct;
+ } else {
+ dbp = kmem_alloc(sizeof(*dbp) + MAXNAMELEN, KM_SLEEP);
+ put = xfs_dir_put_dirent64_uio;
+ }
+
+ /*
+ * Decide on what work routines to call based on the inode size.
+ */
+ *eofp = 0;
+
+ if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
+ retval = xfs_dir_shortform_getdents(dp, uio, eofp, dbp, put);
+ } else if (xfs_bmap_one_block(dp, XFS_DATA_FORK)) {
+ retval = xfs_dir_leaf_getdents(trans, dp, uio, eofp, dbp, put);
+ } else {
+ retval = xfs_dir_node_getdents(trans, dp, uio, eofp, dbp, put);
+ }
+ if (dbp != NULL)
+ kmem_free(dbp, sizeof(*dbp) + MAXNAMELEN);
+
+ return(retval);
+}
+
+static int /* error */
+xfs_dir_replace(xfs_trans_t *trans, xfs_inode_t *dp, char *name, int namelen,
+ xfs_ino_t inum, xfs_fsblock_t *firstblock,
+ xfs_bmap_free_t *flist, xfs_extlen_t total)
+{
+ xfs_da_args_t args;
+ int retval;
+
+ ASSERT((dp->i_d.di_mode & S_IFMT) == S_IFDIR);
+
+ if ((retval = xfs_dir_ino_validate(trans->t_mountp, inum)))
+ return retval;
+
+ /*
+ * Fill in the arg structure for this request.
+ */
+ args.name = name;
+ args.namelen = namelen;
+ args.hashval = xfs_da_hashname(name, namelen);
+ args.inumber = inum;
+ args.dp = dp;
+ args.firstblock = firstblock;
+ args.flist = flist;
+ args.total = total;
+ args.whichfork = XFS_DATA_FORK;
+ args.trans = trans;
+ args.justcheck = args.addname = args.oknoent = 0;
+
+ /*
+ * Decide on what work routines to call based on the inode size.
+ */
+ if (dp->i_d.di_format == XFS_DINODE_FMT_LOCAL) {
+ retval = xfs_dir_shortform_replace(&args);
+ } else if (xfs_bmap_one_block(dp, XFS_DATA_FORK)) {
+ retval = xfs_dir_leaf_replace(&args);
+ } else {
+ retval = xfs_dir_node_replace(&args);
+ }
+
+ return(retval);
+}
+
+static int
+xfs_dir_shortform_validate_ondisk(xfs_mount_t *mp, xfs_dinode_t *dp)
+{
+ xfs_ino_t ino;
+ int namelen_sum;
+ int count;
+ xfs_dir_shortform_t *sf;
+ xfs_dir_sf_entry_t *sfe;
+ int i;
+
+
+
+ if ((INT_GET(dp->di_core.di_mode, ARCH_CONVERT) & S_IFMT) != S_IFDIR) {
+ return 0;
+ }
+ if (INT_GET(dp->di_core.di_format, ARCH_CONVERT) != XFS_DINODE_FMT_LOCAL) {
+ return 0;
+ }
+ if (INT_GET(dp->di_core.di_size, ARCH_CONVERT) < sizeof(sf->hdr)) {
+ xfs_fs_cmn_err(CE_WARN, mp, "Invalid shortform size: dp 0x%p",
+ dp);
+ return 1;
+ }
+ sf = (xfs_dir_shortform_t *)(&dp->di_u.di_dirsf);
+ ino = XFS_GET_DIR_INO_ARCH(mp, sf->hdr.parent, ARCH_CONVERT);
+ if (xfs_dir_ino_validate(mp, ino))
+ return 1;
+
+ count = sf->hdr.count;
+ if ((count < 0) || ((count * 10) > XFS_LITINO(mp))) {
+ xfs_fs_cmn_err(CE_WARN, mp,
+ "Invalid shortform count: dp 0x%p", dp);
+ return(1);
+ }
+
+ if (count == 0) {
+ return 0;
+ }
+
+ namelen_sum = 0;
+ sfe = &sf->list[0];
+ for (i = sf->hdr.count - 1; i >= 0; i--) {
+ ino = XFS_GET_DIR_INO_ARCH(mp, sfe->inumber, ARCH_CONVERT);
+ xfs_dir_ino_validate(mp, ino);
+ if (sfe->namelen >= XFS_LITINO(mp)) {
+ xfs_fs_cmn_err(CE_WARN, mp,
+ "Invalid shortform namelen: dp 0x%p", dp);
+ return 1;
+ }
+ namelen_sum += sfe->namelen;
+ sfe = XFS_DIR_SF_NEXTENTRY(sfe);
+ }
+ if (namelen_sum >= XFS_LITINO(mp)) {
+ xfs_fs_cmn_err(CE_WARN, mp,
+ "Invalid shortform namelen: dp 0x%p", dp);
+ return 1;
+ }
+
+ return 0;
+}
+
+/*========================================================================
+ * External routines when dirsize == XFS_LBSIZE(dp->i_mount).
+ *========================================================================*/
+
+/*
+ * Add a name to the leaf directory structure
+ * This is the external routine.
+ */
+int
+xfs_dir_leaf_addname(xfs_da_args_t *args)
+{
+ int index, retval;
+ xfs_dabuf_t *bp;
+
+ retval = xfs_da_read_buf(args->trans, args->dp, 0, -1, &bp,
+ XFS_DATA_FORK);
+ if (retval)
+ return(retval);
+ ASSERT(bp != NULL);
+
+ retval = xfs_dir_leaf_lookup_int(bp, args, &index);
+ if (retval == ENOENT)
+ retval = xfs_dir_leaf_add(bp, args, index);
+ xfs_da_buf_done(bp);
+ return(retval);
+}
+
+/*
+ * Remove a name from the leaf directory structure
+ * This is the external routine.
+ */
+STATIC int
+xfs_dir_leaf_removename(xfs_da_args_t *args, int *count, int *totallen)
+{
+ xfs_dir_leafblock_t *leaf;
+ int index, retval;
+ xfs_dabuf_t *bp;
+
+ retval = xfs_da_read_buf(args->trans, args->dp, 0, -1, &bp,
+ XFS_DATA_FORK);
+ if (retval)
+ return(retval);
+ ASSERT(bp != NULL);
+ leaf = bp->data;
+ ASSERT(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) == XFS_DIR_LEAF_MAGIC);
+ retval = xfs_dir_leaf_lookup_int(bp, args, &index);
+ if (retval == EEXIST) {
+ (void)xfs_dir_leaf_remove(args->trans, bp, index);
+ *count = INT_GET(leaf->hdr.count, ARCH_CONVERT);
+ *totallen = INT_GET(leaf->hdr.namebytes, ARCH_CONVERT);
+ retval = 0;
+ }
+ xfs_da_buf_done(bp);
+ return(retval);
+}
+
+/*
+ * Look up a name in a leaf directory structure.
+ * This is the external routine.
+ */
+STATIC int
+xfs_dir_leaf_lookup(xfs_da_args_t *args)
+{
+ int index, retval;
+ xfs_dabuf_t *bp;
+
+ retval = xfs_da_read_buf(args->trans, args->dp, 0, -1, &bp,
+ XFS_DATA_FORK);
+ if (retval)
+ return(retval);
+ ASSERT(bp != NULL);
+ retval = xfs_dir_leaf_lookup_int(bp, args, &index);
+ xfs_da_brelse(args->trans, bp);
+ return(retval);
+}
+
+/*
+ * Copy out directory entries for getdents(), for leaf directories.
+ */
+STATIC int
+xfs_dir_leaf_getdents(xfs_trans_t *trans, xfs_inode_t *dp, uio_t *uio,
+ int *eofp, xfs_dirent_t *dbp, xfs_dir_put_t put)
+{
+ xfs_dabuf_t *bp;
+ int retval, eob;
+
+ retval = xfs_da_read_buf(dp->i_transp, dp, 0, -1, &bp, XFS_DATA_FORK);
+ if (retval)
+ return(retval);
+ ASSERT(bp != NULL);
+ retval = xfs_dir_leaf_getdents_int(bp, dp, 0, uio, &eob, dbp, put, -1);
+ xfs_da_brelse(trans, bp);
+ *eofp = (eob == 0);
+ return(retval);
+}
+
+/*
+ * Look up a name in a leaf directory structure, replace the inode number.
+ * This is the external routine.
+ */
+STATIC int
+xfs_dir_leaf_replace(xfs_da_args_t *args)
+{
+ int index, retval;
+ xfs_dabuf_t *bp;
+ xfs_ino_t inum;
+ xfs_dir_leafblock_t *leaf;
+ xfs_dir_leaf_entry_t *entry;
+ xfs_dir_leaf_name_t *namest;
+
+ inum = args->inumber;
+ retval = xfs_da_read_buf(args->trans, args->dp, 0, -1, &bp,
+ XFS_DATA_FORK);
+ if (retval)
+ return(retval);
+ ASSERT(bp != NULL);
+ retval = xfs_dir_leaf_lookup_int(bp, args, &index);
+ if (retval == EEXIST) {
+ leaf = bp->data;
+ entry = &leaf->entries[index];
+ namest = XFS_DIR_LEAF_NAMESTRUCT(leaf, INT_GET(entry->nameidx, ARCH_CONVERT));
+ /* XXX - replace assert? */
+ XFS_DIR_SF_PUT_DIRINO_ARCH(&inum, &namest->inumber, ARCH_CONVERT);
+ xfs_da_log_buf(args->trans, bp,
+ XFS_DA_LOGRANGE(leaf, namest, sizeof(namest->inumber)));
+ xfs_da_buf_done(bp);
+ retval = 0;
+ } else
+ xfs_da_brelse(args->trans, bp);
+ return(retval);
+}
+
+
+/*========================================================================
+ * External routines when dirsize > XFS_LBSIZE(mp).
+ *========================================================================*/
+
+/*
+ * Add a name to a Btree-format directory.
+ *
+ * This will involve walking down the Btree, and may involve splitting
+ * leaf nodes and even splitting intermediate nodes up to and including
+ * the root node (a special case of an intermediate node).
+ */
+STATIC int
+xfs_dir_node_addname(xfs_da_args_t *args)
+{
+ xfs_da_state_t *state;
+ xfs_da_state_blk_t *blk;
+ int retval, error;
+
+ /*
+ * Fill in bucket of arguments/results/context to carry around.
+ */
+ state = xfs_da_state_alloc();
+ state->args = args;
+ state->mp = args->dp->i_mount;
+ state->blocksize = state->mp->m_sb.sb_blocksize;
+ state->node_ents = state->mp->m_dir_node_ents;
+
+ /*
+ * Search to see if name already exists, and get back a pointer
+ * to where it should go.
+ */
+ error = xfs_da_node_lookup_int(state, &retval);
+ if (error)
+ retval = error;
+ if (retval != ENOENT)
+ goto error;
+ blk = &state->path.blk[ state->path.active-1 ];
+ ASSERT(blk->magic == XFS_DIR_LEAF_MAGIC);
+ retval = xfs_dir_leaf_add(blk->bp, args, blk->index);
+ if (retval == 0) {
+ /*
+ * Addition succeeded, update Btree hashvals.
+ */
+ if (!args->justcheck)
+ xfs_da_fixhashpath(state, &state->path);
+ } else {
+ /*
+ * Addition failed, split as many Btree elements as required.
+ */
+ if (args->total == 0) {
+ ASSERT(retval == ENOSPC);
+ goto error;
+ }
+ retval = xfs_da_split(state);
+ }
+error:
+ xfs_da_state_free(state);
+
+ return(retval);
+}
+
+/*
+ * Remove a name from a B-tree directory.
+ *
+ * This will involve walking down the Btree, and may involve joining
+ * leaf nodes and even joining intermediate nodes up to and including
+ * the root node (a special case of an intermediate node).
+ */
+STATIC int
+xfs_dir_node_removename(xfs_da_args_t *args)
+{
+ xfs_da_state_t *state;
+ xfs_da_state_blk_t *blk;
+ int retval, error;
+
+ state = xfs_da_state_alloc();
+ state->args = args;
+ state->mp = args->dp->i_mount;
+ state->blocksize = state->mp->m_sb.sb_blocksize;
+ state->node_ents = state->mp->m_dir_node_ents;
+
+ /*
+ * Search to see if name exists, and get back a pointer to it.
+ */
+ error = xfs_da_node_lookup_int(state, &retval);
+ if (error)
+ retval = error;
+ if (retval != EEXIST) {
+ xfs_da_state_free(state);
+ return(retval);
+ }
+
+ /*
+ * Remove the name and update the hashvals in the tree.
+ */
+ blk = &state->path.blk[ state->path.active-1 ];
+ ASSERT(blk->magic == XFS_DIR_LEAF_MAGIC);
+ retval = xfs_dir_leaf_remove(args->trans, blk->bp, blk->index);
+ xfs_da_fixhashpath(state, &state->path);
+
+ /*
+ * Check to see if the tree needs to be collapsed.
+ */
+ error = 0;
+ if (retval) {
+ error = xfs_da_join(state);
+ }
+
+ xfs_da_state_free(state);
+ if (error)
+ return(error);
+ return(0);
+}
+
+/*
+ * Look up a filename in a int directory.
+ * Use an internal routine to actually do all the work.
+ */
+STATIC int
+xfs_dir_node_lookup(xfs_da_args_t *args)
+{
+ xfs_da_state_t *state;
+ int retval, error, i;
+
+ state = xfs_da_state_alloc();
+ state->args = args;
+ state->mp = args->dp->i_mount;
+ state->blocksize = state->mp->m_sb.sb_blocksize;
+ state->node_ents = state->mp->m_dir_node_ents;
+
+ /*
+ * Search to see if name exists,
+ * and get back a pointer to it.
+ */
+ error = xfs_da_node_lookup_int(state, &retval);
+ if (error) {
+ retval = error;
+ }
+
+ /*
+ * If not in a transaction, we have to release all the buffers.
+ */
+ 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(retval);
+}
+
+STATIC int
+xfs_dir_node_getdents(xfs_trans_t *trans, xfs_inode_t *dp, uio_t *uio,
+ int *eofp, xfs_dirent_t *dbp, xfs_dir_put_t put)
+{
+ xfs_da_intnode_t *node;
+ xfs_da_node_entry_t *btree;
+ xfs_dir_leafblock_t *leaf = NULL;
+ xfs_dablk_t bno, nextbno;
+ xfs_dahash_t cookhash;
+ xfs_mount_t *mp;
+ int error, eob, i;
+ xfs_dabuf_t *bp;
+ xfs_daddr_t nextda;
+
+ /*
+ * Pick up our context.
+ */
+ mp = dp->i_mount;
+ bp = NULL;
+ bno = XFS_DA_COOKIE_BNO(mp, uio->uio_offset);
+ cookhash = XFS_DA_COOKIE_HASH(mp, uio->uio_offset);
+
+ xfs_dir_trace_g_du("node: start", dp, uio);
+
+ /*
+ * Re-find our place, even if we're confused about what our place is.
+ *
+ * First we check the block number from the magic cookie, it is a
+ * cache of where we ended last time. If we find a leaf block, and
+ * the starting hashval in that block is less than our desired
+ * hashval, then we run with it.
+ */
+ if (bno > 0) {
+ error = xfs_da_read_buf(trans, dp, bno, -2, &bp, XFS_DATA_FORK);
+ if ((error != 0) && (error != EFSCORRUPTED))
+ return(error);
+ if (bp)
+ leaf = bp->data;
+ if (bp && INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) != XFS_DIR_LEAF_MAGIC) {
+ xfs_dir_trace_g_dub("node: block not a leaf",
+ dp, uio, bno);
+ xfs_da_brelse(trans, bp);
+ bp = NULL;
+ }
+ if (bp && INT_GET(leaf->entries[0].hashval, ARCH_CONVERT) > cookhash) {
+ xfs_dir_trace_g_dub("node: leaf hash too large",
+ dp, uio, bno);
+ xfs_da_brelse(trans, bp);
+ bp = NULL;
+ }
+ if (bp &&
+ cookhash > INT_GET(leaf->entries[INT_GET(leaf->hdr.count, ARCH_CONVERT) - 1].hashval, ARCH_CONVERT)) {
+ xfs_dir_trace_g_dub("node: leaf hash too small",
+ dp, uio, bno);
+ xfs_da_brelse(trans, bp);
+ bp = NULL;
+ }
+ }
+
+ /*
+ * If we did not find a leaf block from the blockno in the cookie,
+ * or we there was no blockno in the cookie (eg: first time thru),
+ * the we start at the top of the Btree and re-find our hashval.
+ */
+ if (bp == NULL) {
+ xfs_dir_trace_g_du("node: start at root" , dp, uio);
+ bno = 0;
+ for (;;) {
+ error = xfs_da_read_buf(trans, dp, bno, -1, &bp,
+ XFS_DATA_FORK);
+ if (error)
+ return(error);
+ if (bp == NULL)
+ return(XFS_ERROR(EFSCORRUPTED));
+ node = bp->data;
+ if (INT_GET(node->hdr.info.magic, ARCH_CONVERT) != XFS_DA_NODE_MAGIC)
+ break;
+ btree = &node->btree[0];
+ xfs_dir_trace_g_dun("node: node detail", dp, uio, node);
+ for (i = 0; i < INT_GET(node->hdr.count, ARCH_CONVERT); btree++, i++) {
+ if (INT_GET(btree->hashval, ARCH_CONVERT) >= cookhash) {
+ bno = INT_GET(btree->before, ARCH_CONVERT);
+ break;
+ }
+ }
+ if (i == INT_GET(node->hdr.count, ARCH_CONVERT)) {
+ xfs_da_brelse(trans, bp);
+ xfs_dir_trace_g_du("node: hash beyond EOF",
+ dp, uio);
+ uio->uio_offset = XFS_DA_MAKE_COOKIE(mp, 0, 0,
+ XFS_DA_MAXHASH);
+ *eofp = 1;
+ return(0);
+ }
+ xfs_dir_trace_g_dub("node: going to block",
+ dp, uio, bno);
+ xfs_da_brelse(trans, bp);
+ }
+ }
+ ASSERT(cookhash != XFS_DA_MAXHASH);
+
+ /*
+ * We've dropped down to the (first) leaf block that contains the
+ * hashval we are interested in. Continue rolling upward thru the
+ * leaf blocks until we fill up our buffer.
+ */
+ for (;;) {
+ leaf = bp->data;
+ if (unlikely(INT_GET(leaf->hdr.info.magic, ARCH_CONVERT) != XFS_DIR_LEAF_MAGIC)) {
+ xfs_dir_trace_g_dul("node: not a leaf", dp, uio, leaf);
+ xfs_da_brelse(trans, bp);
+ XFS_CORRUPTION_ERROR("xfs_dir_node_getdents(1)",
+ XFS_ERRLEVEL_LOW, mp, leaf);
+ return XFS_ERROR(EFSCORRUPTED);
+ }
+ xfs_dir_trace_g_dul("node: leaf detail", dp, uio, leaf);
+ if ((nextbno = INT_GET(leaf->hdr.info.forw, ARCH_CONVERT))) {
+ nextda = xfs_da_reada_buf(trans, dp, nextbno,
+ XFS_DATA_FORK);
+ } else
+ nextda = -1;
+ error = xfs_dir_leaf_getdents_int(bp, dp, bno, uio, &eob, dbp,
+ put, nextda);
+ xfs_da_brelse(trans, bp);
+ bno = nextbno;
+ if (eob) {
+ xfs_dir_trace_g_dub("node: E-O-B", dp, uio, bno);
+ *eofp = 0;
+ return(error);
+ }
+ if (bno == 0)
+ break;
+ error = xfs_da_read_buf(trans, dp, bno, nextda, &bp,
+ XFS_DATA_FORK);
+ if (error)
+ return(error);
+ if (unlikely(bp == NULL)) {
+ XFS_ERROR_REPORT("xfs_dir_node_getdents(2)",
+ XFS_ERRLEVEL_LOW, mp);
+ return(XFS_ERROR(EFSCORRUPTED));
+ }
+ }
+ *eofp = 1;
+ xfs_dir_trace_g_du("node: E-O-F", dp, uio);
+ return(0);
+}
+
+/*
+ * Look up a filename in an int directory, replace the inode number.
+ * Use an internal routine to actually do the lookup.
+ */
+STATIC int
+xfs_dir_node_replace(xfs_da_args_t *args)
+{
+ xfs_da_state_t *state;
+ xfs_da_state_blk_t *blk;
+ xfs_dir_leafblock_t *leaf;
+ xfs_dir_leaf_entry_t *entry;
+ xfs_dir_leaf_name_t *namest;
+ xfs_ino_t inum;
+ int retval, error, i;
+ xfs_dabuf_t *bp;
+
+ state = xfs_da_state_alloc();
+ state->args = args;
+ state->mp = args->dp->i_mount;
+ state->blocksize = state->mp->m_sb.sb_blocksize;
+ state->node_ents = state->mp->m_dir_node_ents;
+ inum = args->inumber;
+
+ /*
+ * Search to see if name exists,
+ * and get back a pointer to it.
+ */
+ error = xfs_da_node_lookup_int(state, &retval);
+ if (error) {
+ retval = error;
+ }
+
+ if (retval == EEXIST) {
+ blk = &state->path.blk[state->path.active - 1];
+ ASSERT(blk->magic == XFS_DIR_LEAF_MAGIC);
+ bp = blk->bp;
+ leaf = bp->data;
+ entry = &leaf->entries[blk->index];
+ namest = XFS_DIR_LEAF_NAMESTRUCT(leaf, INT_GET(entry->nameidx, ARCH_CONVERT));
+ /* XXX - replace assert ? */
+ XFS_DIR_SF_PUT_DIRINO_ARCH(&inum, &namest->inumber, ARCH_CONVERT);
+ xfs_da_log_buf(args->trans, bp,
+ XFS_DA_LOGRANGE(leaf, namest, sizeof(namest->inumber)));
+ xfs_da_buf_done(bp);
+ blk->bp = NULL;
+ retval = 0;
+ } else {
+ i = state->path.active - 1;
+ xfs_da_brelse(args->trans, state->path.blk[i].bp);
+ state->path.blk[i].bp = NULL;
+ }
+ for (i = 0; i < state->path.active - 1; i++) {
+ xfs_da_brelse(args->trans, state->path.blk[i].bp);
+ state->path.blk[i].bp = NULL;
+ }
+
+ xfs_da_state_free(state);
+ return(retval);
+}
+
+#if defined(XFS_DIR_TRACE)
+/*
+ * Add a trace buffer entry for an inode and a uio.
+ */
+void
+xfs_dir_trace_g_du(char *where, xfs_inode_t *dp, uio_t *uio)
+{
+ xfs_dir_trace_enter(XFS_DIR_KTRACE_G_DU, where,
+ (void *)dp, (void *)dp->i_mount,
+ (void *)((unsigned long)(uio->uio_offset >> 32)),
+ (void *)((unsigned long)(uio->uio_offset & 0xFFFFFFFF)),
+ (void *)(unsigned long)uio->uio_resid,
+ NULL, NULL, NULL, NULL, NULL, NULL, NULL);
+}
+
+/*
+ * Add a trace buffer entry for an inode and a uio.
+ */
+void
+xfs_dir_trace_g_dub(char *where, xfs_inode_t *dp, uio_t *uio, xfs_dablk_t bno)
+{
+ xfs_dir_trace_enter(XFS_DIR_KTRACE_G_DUB, where,
+ (void *)dp, (void *)dp->i_mount,
+ (void *)((unsigned long)(uio->uio_offset >> 32)),
+ (void *)((unsigned long)(uio->uio_offset & 0xFFFFFFFF)),
+ (void *)(unsigned long)uio->uio_resid,
+ (void *)(unsigned long)bno,
+ NULL, NULL, NULL, NULL, NULL, NULL);
+}
+
+/*
+ * Add a trace buffer entry for an inode and a uio.
+ */
+void
+xfs_dir_trace_g_dun(char *where, xfs_inode_t *dp, uio_t *uio,
+ xfs_da_intnode_t *node)
+{
+ int last = INT_GET(node->hdr.count, ARCH_CONVERT) - 1;
+
+ xfs_dir_trace_enter(XFS_DIR_KTRACE_G_DUN, where,
+ (void *)dp, (void *)dp->i_mount,
+ (void *)((unsigned long)(uio->uio_offset >> 32)),
+ (void *)((unsigned long)(uio->uio_offset & 0xFFFFFFFF)),
+ (void *)(unsigned long)uio->uio_resid,
+ (void *)(unsigned long)
+ INT_GET(node->hdr.info.forw, ARCH_CONVERT),
+ (void *)(unsigned long)
+ INT_GET(node->hdr.count, ARCH_CONVERT),
+ (void *)(unsigned long)
+ INT_GET(node->btree[0].hashval, ARCH_CONVERT),
+ (void *)(unsigned long)
+ INT_GET(node->btree[last].hashval, ARCH_CONVERT),
+ NULL, NULL, NULL);
+}
+
+/*
+ * Add a trace buffer entry for an inode and a uio.
+ */
+void
+xfs_dir_trace_g_dul(char *where, xfs_inode_t *dp, uio_t *uio,
+ xfs_dir_leafblock_t *leaf)
+{
+ int last = INT_GET(leaf->hdr.count, ARCH_CONVERT) - 1;
+
+ xfs_dir_trace_enter(XFS_DIR_KTRACE_G_DUL, where,
+ (void *)dp, (void *)dp->i_mount,
+ (void *)((unsigned long)(uio->uio_offset >> 32)),
+ (void *)((unsigned long)(uio->uio_offset & 0xFFFFFFFF)),
+ (void *)(unsigned long)uio->uio_resid,
+ (void *)(unsigned long)
+ INT_GET(leaf->hdr.info.forw, ARCH_CONVERT),
+ (void *)(unsigned long)
+ INT_GET(leaf->hdr.count, ARCH_CONVERT),
+ (void *)(unsigned long)
+ INT_GET(leaf->entries[0].hashval, ARCH_CONVERT),
+ (void *)(unsigned long)
+ INT_GET(leaf->entries[last].hashval, ARCH_CONVERT),
+ NULL, NULL, NULL);
+}
+
+/*
+ * Add a trace buffer entry for an inode and a uio.
+ */
+void
+xfs_dir_trace_g_due(char *where, xfs_inode_t *dp, uio_t *uio,
+ xfs_dir_leaf_entry_t *entry)
+{
+ xfs_dir_trace_enter(XFS_DIR_KTRACE_G_DUE, where,
+ (void *)dp, (void *)dp->i_mount,
+ (void *)((unsigned long)(uio->uio_offset >> 32)),
+ (void *)((unsigned long)(uio->uio_offset & 0xFFFFFFFF)),
+ (void *)(unsigned long)uio->uio_resid,
+ (void *)(unsigned long)
+ INT_GET(entry->hashval, ARCH_CONVERT),
+ NULL, NULL, NULL, NULL, NULL, NULL);
+}
+
+/*
+ * Add a trace buffer entry for an inode and a uio.
+ */
+void
+xfs_dir_trace_g_duc(char *where, xfs_inode_t *dp, uio_t *uio, xfs_off_t cookie)
+{
+ xfs_dir_trace_enter(XFS_DIR_KTRACE_G_DUC, where,
+ (void *)dp, (void *)dp->i_mount,
+ (void *)((unsigned long)(uio->uio_offset >> 32)),
+ (void *)((unsigned long)(uio->uio_offset & 0xFFFFFFFF)),
+ (void *)(unsigned long)uio->uio_resid,
+ (void *)((unsigned long)(cookie >> 32)),
+ (void *)((unsigned long)(cookie & 0xFFFFFFFF)),
+ NULL, NULL, NULL, NULL, NULL);
+}
+
+/*
+ * Add a trace buffer entry for the arguments given to the routine,
+ * generic form.
+ */
+void
+xfs_dir_trace_enter(int type, char *where,
+ void * a0, void * a1,
+ void * a2, void * a3,
+ void * a4, void * a5,
+ void * a6, void * a7,
+ void * a8, void * a9,
+ void * a10, void * a11)
+{
+ ASSERT(xfs_dir_trace_buf);
+ ktrace_enter(xfs_dir_trace_buf, (void *)(unsigned long)type,
+ (void *)where,
+ (void *)a0, (void *)a1, (void *)a2,
+ (void *)a3, (void *)a4, (void *)a5,
+ (void *)a6, (void *)a7, (void *)a8,
+ (void *)a9, (void *)a10, (void *)a11,
+ NULL, NULL);
+}
+#endif /* XFS_DIR_TRACE */
FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)