/*
* Copyright (c) 2000 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>
/*
* xfs_dir.c
*
* Provide the external interfaces to manage directories.
*/
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_da_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;
}
/*
* 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;
bzero((char *)&args, sizeof(args));
args.dp = dir;
args.trans = trans;
ASSERT((dir->i_d.di_mode & IFMT) == 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 & IFMT) == 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 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 & IFMT) == 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 & IFMT) == IFDIR);
if (namelen >= MAXNAMELEN) {
return(XFS_ERROR(EINVAL));
}
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);
}
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 & IFMT) == IFDIR);
if (namelen >= MAXNAMELEN) {
return(XFS_ERROR(EINVAL));
}
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);
}
/*========================================================================
* 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);
}
/*
* 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;
/*
* 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;
/*
* 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;
/*
* 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);
}
/*
* 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;
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);
}
![[BACK]](/icons/back.gif){kind=icon}
Return to xfs_dir.c CVS log ![[TXT]](/icons/text.gif){kind=icon}
![[DIR]](/icons/dir.gif){kind=icon}
Up to [Development] / xfs-cmds / xfsprogs / libxfs