/*
|
/*
|
* linux/fs/ufs/ufs_namei.c
|
* linux/fs/ufs/ufs_namei.c
|
*
|
*
|
* Copyright (C) 1996
|
* Copyright (C) 1996
|
* Adrian Rodriguez (adrian@franklins-tower.rutgers.edu)
|
* Adrian Rodriguez (adrian@franklins-tower.rutgers.edu)
|
* Laboratory for Computer Science Research Computing Facility
|
* Laboratory for Computer Science Research Computing Facility
|
* Rutgers, The State University of New Jersey
|
* Rutgers, The State University of New Jersey
|
*
|
*
|
* $Id: ufs_namei.c,v 1.1 2005-12-20 10:26:35 jcastillo Exp $
|
* $Id: ufs_namei.c,v 1.1 2005-12-20 10:26:35 jcastillo Exp $
|
*
|
*
|
*/
|
*/
|
|
|
#include <linux/fs.h>
|
#include <linux/fs.h>
|
|
|
extern unsigned int ufs_bmap(struct inode * inode, int block); /* XXX */
|
extern unsigned int ufs_bmap(struct inode * inode, int block); /* XXX */
|
|
|
/*
|
/*
|
* NOTE! unlike strncmp, ext2_match returns 1 for success, 0 for failure.
|
* NOTE! unlike strncmp, ext2_match returns 1 for success, 0 for failure.
|
* stolen from ext2fs
|
* stolen from ext2fs
|
*/
|
*/
|
static int ufs_match (int len, const char * const name, struct ufs_direct * d)
|
static int ufs_match (int len, const char * const name, struct ufs_direct * d)
|
{
|
{
|
if (!d || len > UFS_MAXNAMLEN)
|
if (!d || len > UFS_MAXNAMLEN)
|
return 0;
|
return 0;
|
/*
|
/*
|
* "" means "." ---> so paths like "/usr/lib//libc.a" work
|
* "" means "." ---> so paths like "/usr/lib//libc.a" work
|
*/
|
*/
|
if (!len && (d->d_namlen == 1) && (d->d_name[0] == '.') &&
|
if (!len && (d->d_namlen == 1) && (d->d_name[0] == '.') &&
|
(d->d_name[1] == '\0'))
|
(d->d_name[1] == '\0'))
|
return 1;
|
return 1;
|
if (len != d->d_namlen)
|
if (len != d->d_namlen)
|
return 0;
|
return 0;
|
return !memcmp(name, d->d_name, len);
|
return !memcmp(name, d->d_name, len);
|
}
|
}
|
|
|
/* XXX - this is a mess, especially for endianity */
|
/* XXX - this is a mess, especially for endianity */
|
int ufs_lookup (struct inode * dir, const char * name, int len,
|
int ufs_lookup (struct inode * dir, const char * name, int len,
|
struct inode ** result)
|
struct inode ** result)
|
{
|
{
|
unsigned long int lfragno, fragno;
|
unsigned long int lfragno, fragno;
|
struct buffer_head * bh;
|
struct buffer_head * bh;
|
struct ufs_direct * d;
|
struct ufs_direct * d;
|
|
|
/*
|
/*
|
* Touching /xyzzy in a filesystem toggles debugging messages.
|
* Touching /xyzzy in a filesystem toggles debugging messages.
|
*/
|
*/
|
if ((len == 5) && !(memcmp(name, "xyzzy", len)) &&
|
if ((len == 5) && !(memcmp(name, "xyzzy", len)) &&
|
(dir->i_ino == UFS_ROOTINO)) {
|
(dir->i_ino == UFS_ROOTINO)) {
|
dir->i_sb->u.ufs_sb.s_flags ^= UFS_DEBUG;
|
dir->i_sb->u.ufs_sb.s_flags ^= UFS_DEBUG;
|
printk("UFS debugging %s\n",
|
printk("UFS debugging %s\n",
|
(dir->i_sb->u.ufs_sb.s_flags & UFS_DEBUG) ?
|
(dir->i_sb->u.ufs_sb.s_flags & UFS_DEBUG) ?
|
"on": "off");
|
"on": "off");
|
return(-ENOENT);
|
return(-ENOENT);
|
}
|
}
|
|
|
/*
|
/*
|
* Touching /xyzzy.i in a filesystem toggles debugging for ufs_inode.c.
|
* Touching /xyzzy.i in a filesystem toggles debugging for ufs_inode.c.
|
*/
|
*/
|
if ((len == 7) && !(memcmp(name, "xyzzy.i", len)) &&
|
if ((len == 7) && !(memcmp(name, "xyzzy.i", len)) &&
|
(dir->i_ino == UFS_ROOTINO)) {
|
(dir->i_ino == UFS_ROOTINO)) {
|
dir->i_sb->u.ufs_sb.s_flags ^= UFS_DEBUG_INODE;
|
dir->i_sb->u.ufs_sb.s_flags ^= UFS_DEBUG_INODE;
|
printk("UFS inode debugging %s\n",
|
printk("UFS inode debugging %s\n",
|
(dir->i_sb->u.ufs_sb.s_flags & UFS_DEBUG_INODE) ?
|
(dir->i_sb->u.ufs_sb.s_flags & UFS_DEBUG_INODE) ?
|
"on": "off");
|
"on": "off");
|
return(-ENOENT);
|
return(-ENOENT);
|
}
|
}
|
|
|
if ((len == 7) && !(memcmp(name, "xyzzy.n", len)) &&
|
if ((len == 7) && !(memcmp(name, "xyzzy.n", len)) &&
|
(dir->i_ino == UFS_ROOTINO)) {
|
(dir->i_ino == UFS_ROOTINO)) {
|
dir->i_sb->u.ufs_sb.s_flags ^= UFS_DEBUG_NAMEI;
|
dir->i_sb->u.ufs_sb.s_flags ^= UFS_DEBUG_NAMEI;
|
printk("UFS namei debugging %s\n",
|
printk("UFS namei debugging %s\n",
|
(dir->i_sb->u.ufs_sb.s_flags & UFS_DEBUG_NAMEI) ?
|
(dir->i_sb->u.ufs_sb.s_flags & UFS_DEBUG_NAMEI) ?
|
"on": "off");
|
"on": "off");
|
return(-ENOENT);
|
return(-ENOENT);
|
}
|
}
|
|
|
if ((len == 7) && !(memcmp(name, "xyzzy.l", len)) &&
|
if ((len == 7) && !(memcmp(name, "xyzzy.l", len)) &&
|
(dir->i_ino == UFS_ROOTINO)) {
|
(dir->i_ino == UFS_ROOTINO)) {
|
dir->i_sb->u.ufs_sb.s_flags ^= UFS_DEBUG_LINKS;
|
dir->i_sb->u.ufs_sb.s_flags ^= UFS_DEBUG_LINKS;
|
printk("UFS symlink debugging %s\n",
|
printk("UFS symlink debugging %s\n",
|
(dir->i_sb->u.ufs_sb.s_flags & UFS_DEBUG_LINKS) ?
|
(dir->i_sb->u.ufs_sb.s_flags & UFS_DEBUG_LINKS) ?
|
"on": "off");
|
"on": "off");
|
return(-ENOENT);
|
return(-ENOENT);
|
}
|
}
|
|
|
if (dir->i_sb->u.ufs_sb.s_flags & (UFS_DEBUG|UFS_DEBUG_NAMEI)) {
|
if (dir->i_sb->u.ufs_sb.s_flags & (UFS_DEBUG|UFS_DEBUG_NAMEI)) {
|
printk("ufs_lookup: called for ino %lu name %s\n",
|
printk("ufs_lookup: called for ino %lu name %s\n",
|
dir->i_ino, name);
|
dir->i_ino, name);
|
}
|
}
|
|
|
/* XXX - do I want i_blocks in 512-blocks or 1024-blocks? */
|
/* XXX - do I want i_blocks in 512-blocks or 1024-blocks? */
|
for (lfragno = 0; lfragno < (dir->i_blocks)>>1; lfragno++) {
|
for (lfragno = 0; lfragno < (dir->i_blocks)>>1; lfragno++) {
|
fragno = ufs_bmap(dir, lfragno);
|
fragno = ufs_bmap(dir, lfragno);
|
/* XXX - ufs_bmap() call needs error checking */
|
/* XXX - ufs_bmap() call needs error checking */
|
/* XXX - s_blocksize is actually the UFS frag size */
|
/* XXX - s_blocksize is actually the UFS frag size */
|
if (dir->i_sb->u.ufs_sb.s_flags & UFS_DEBUG) {
|
if (dir->i_sb->u.ufs_sb.s_flags & UFS_DEBUG) {
|
printk("ufs_lookup: ino %lu lfragno %lu fragno %lu\n",
|
printk("ufs_lookup: ino %lu lfragno %lu fragno %lu\n",
|
dir->i_ino, lfragno, fragno);
|
dir->i_ino, lfragno, fragno);
|
}
|
}
|
if (fragno == 0) {
|
if (fragno == 0) {
|
/* XXX - bug bug bug */
|
/* XXX - bug bug bug */
|
return(-ENOENT);
|
return(-ENOENT);
|
}
|
}
|
bh = bread(dir->i_dev, fragno, dir->i_sb->s_blocksize);
|
bh = bread(dir->i_dev, fragno, dir->i_sb->s_blocksize);
|
if (bh == NULL) {
|
if (bh == NULL) {
|
printk("ufs_lookup: bread failed: ino %lu, lfragno %lu",
|
printk("ufs_lookup: bread failed: ino %lu, lfragno %lu",
|
dir->i_ino, lfragno);
|
dir->i_ino, lfragno);
|
return(-EIO);
|
return(-EIO);
|
}
|
}
|
d = (struct ufs_direct *)(bh->b_data);
|
d = (struct ufs_direct *)(bh->b_data);
|
while (((char *)d - bh->b_data + d->d_reclen) <=
|
while (((char *)d - bh->b_data + d->d_reclen) <=
|
dir->i_sb->s_blocksize) {
|
dir->i_sb->s_blocksize) {
|
/* XXX - skip block if d_reclen or d_namlen is 0 */
|
/* XXX - skip block if d_reclen or d_namlen is 0 */
|
if ((d->d_reclen == 0) || (d->d_namlen == 0)) {
|
if ((d->d_reclen == 0) || (d->d_namlen == 0)) {
|
if (dir->i_sb->u.ufs_sb.s_flags & UFS_DEBUG) {
|
if (dir->i_sb->u.ufs_sb.s_flags & UFS_DEBUG) {
|
printk("ufs_lookup: skipped space in directory, ino %lu\n",
|
printk("ufs_lookup: skipped space in directory, ino %lu\n",
|
dir->i_ino);
|
dir->i_ino);
|
}
|
}
|
break;
|
break;
|
}
|
}
|
if (dir->i_sb->u.ufs_sb.s_flags & UFS_DEBUG) {
|
if (dir->i_sb->u.ufs_sb.s_flags & UFS_DEBUG) {
|
printk("lfragno 0x%lx direct d 0x%x d_ino %u d_reclen %u d_namlen %u d_name `%s'\n",
|
printk("lfragno 0x%lx direct d 0x%x d_ino %u d_reclen %u d_namlen %u d_name `%s'\n",
|
lfragno, (unsigned int)d, d->d_ino, d->d_reclen, d->d_namlen, d->d_name);
|
lfragno, (unsigned int)d, d->d_ino, d->d_reclen, d->d_namlen, d->d_name);
|
}
|
}
|
if ((d->d_namlen == len) &&
|
if ((d->d_namlen == len) &&
|
/* XXX - don't use strncmp() - see ext2fs */
|
/* XXX - don't use strncmp() - see ext2fs */
|
(ufs_match(len, name, d))) {
|
(ufs_match(len, name, d))) {
|
/* We have a match */
|
/* We have a match */
|
*result = iget(dir->i_sb, d->d_ino);
|
*result = iget(dir->i_sb, d->d_ino);
|
brelse(bh);
|
brelse(bh);
|
return(0);
|
return(0);
|
} else {
|
} else {
|
/* XXX - bounds checking */
|
/* XXX - bounds checking */
|
if (dir->i_sb->u.ufs_sb.s_flags & UFS_DEBUG) {
|
if (dir->i_sb->u.ufs_sb.s_flags & UFS_DEBUG) {
|
printk("ufs_lookup: wanted (%s,%d) got (%s,%d)\n",
|
printk("ufs_lookup: wanted (%s,%d) got (%s,%d)\n",
|
name, len, d->d_name, d->d_namlen);
|
name, len, d->d_name, d->d_namlen);
|
}
|
}
|
}
|
}
|
d = (struct ufs_direct *)((char *)d + d->d_reclen);
|
d = (struct ufs_direct *)((char *)d + d->d_reclen);
|
}
|
}
|
brelse(bh);
|
brelse(bh);
|
}
|
}
|
return(-ENOENT);
|
return(-ENOENT);
|
}
|
}
|
|
|
/*
|
/*
|
* Local Variables: ***
|
* Local Variables: ***
|
* c-indent-level: 8 ***
|
* c-indent-level: 8 ***
|
* c-continued-statement-offset: 8 ***
|
* c-continued-statement-offset: 8 ***
|
* c-brace-offset: -8 ***
|
* c-brace-offset: -8 ***
|
* c-argdecl-indent: 0 ***
|
* c-argdecl-indent: 0 ***
|
* c-label-offset: -8 ***
|
* c-label-offset: -8 ***
|
* End: ***
|
* End: ***
|
*/
|
*/
|
|
|
