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199 |
simons |
/*
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* linux/fs/ufs/ufs_namei.c
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*
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* Copyright (C) 1996
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* Adrian Rodriguez (adrian@franklins-tower.rutgers.edu)
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* Laboratory for Computer Science Research Computing Facility
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* Rutgers, The State University of New Jersey
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*
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* $Id: ufs_namei.c,v 1.1.1.1 2001-09-10 07:44:40 simons Exp $
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*
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*/
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#include <linux/fs.h>
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extern unsigned int ufs_bmap(struct inode * inode, int block); /* XXX */
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/*
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* NOTE! unlike strncmp, ext2_match returns 1 for success, 0 for failure.
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* stolen from ext2fs
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*/
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static int ufs_match (int len, const char * const name, struct ufs_direct * d)
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{
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if (!d || len > UFS_MAXNAMLEN)
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return 0;
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/*
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* "" means "." ---> so paths like "/usr/lib//libc.a" work
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*/
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if (!len && (d->d_namlen == 1) && (d->d_name[0] == '.') &&
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(d->d_name[1] == '\0'))
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return 1;
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if (len != d->d_namlen)
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return 0;
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return !memcmp(name, d->d_name, len);
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}
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/* XXX - this is a mess, especially for endianity */
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int ufs_lookup (struct inode * dir, const char * name, int len,
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struct inode ** result)
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{
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unsigned long int lfragno, fragno;
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struct buffer_head * bh;
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struct ufs_direct * d;
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/*
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* Touching /xyzzy in a filesystem toggles debugging messages.
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*/
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if ((len == 5) && !(memcmp(name, "xyzzy", len)) &&
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(dir->i_ino == UFS_ROOTINO)) {
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dir->i_sb->u.ufs_sb.s_flags ^= UFS_DEBUG;
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printk("UFS debugging %s\n",
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(dir->i_sb->u.ufs_sb.s_flags & UFS_DEBUG) ?
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"on": "off");
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return(-ENOENT);
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}
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/*
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* Touching /xyzzy.i in a filesystem toggles debugging for ufs_inode.c.
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*/
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if ((len == 7) && !(memcmp(name, "xyzzy.i", len)) &&
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(dir->i_ino == UFS_ROOTINO)) {
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dir->i_sb->u.ufs_sb.s_flags ^= UFS_DEBUG_INODE;
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printk("UFS inode debugging %s\n",
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(dir->i_sb->u.ufs_sb.s_flags & UFS_DEBUG_INODE) ?
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"on": "off");
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return(-ENOENT);
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}
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if ((len == 7) && !(memcmp(name, "xyzzy.n", len)) &&
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(dir->i_ino == UFS_ROOTINO)) {
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dir->i_sb->u.ufs_sb.s_flags ^= UFS_DEBUG_NAMEI;
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printk("UFS namei debugging %s\n",
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(dir->i_sb->u.ufs_sb.s_flags & UFS_DEBUG_NAMEI) ?
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"on": "off");
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return(-ENOENT);
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}
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if ((len == 7) && !(memcmp(name, "xyzzy.l", len)) &&
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(dir->i_ino == UFS_ROOTINO)) {
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dir->i_sb->u.ufs_sb.s_flags ^= UFS_DEBUG_LINKS;
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printk("UFS symlink debugging %s\n",
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(dir->i_sb->u.ufs_sb.s_flags & UFS_DEBUG_LINKS) ?
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"on": "off");
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return(-ENOENT);
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}
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if (dir->i_sb->u.ufs_sb.s_flags & (UFS_DEBUG|UFS_DEBUG_NAMEI)) {
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printk("ufs_lookup: called for ino %lu name %s\n",
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dir->i_ino, name);
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}
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/* XXX - do I want i_blocks in 512-blocks or 1024-blocks? */
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for (lfragno = 0; lfragno < (dir->i_blocks)>>1; lfragno++) {
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fragno = ufs_bmap(dir, lfragno);
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/* XXX - ufs_bmap() call needs error checking */
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/* XXX - s_blocksize is actually the UFS frag size */
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if (dir->i_sb->u.ufs_sb.s_flags & UFS_DEBUG) {
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printk("ufs_lookup: ino %lu lfragno %lu fragno %lu\n",
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dir->i_ino, lfragno, fragno);
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}
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if (fragno == 0) {
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/* XXX - bug bug bug */
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return(-ENOENT);
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}
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bh = bread(dir->i_dev, fragno, dir->i_sb->s_blocksize);
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if (bh == NULL) {
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printk("ufs_lookup: bread failed: ino %lu, lfragno %lu",
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dir->i_ino, lfragno);
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return(-EIO);
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}
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d = (struct ufs_direct *)(bh->b_data);
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while (((char *)d - bh->b_data + d->d_reclen) <=
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dir->i_sb->s_blocksize) {
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/* XXX - skip block if d_reclen or d_namlen is 0 */
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if ((d->d_reclen == 0) || (d->d_namlen == 0)) {
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if (dir->i_sb->u.ufs_sb.s_flags & UFS_DEBUG) {
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printk("ufs_lookup: skipped space in directory, ino %lu\n",
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dir->i_ino);
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}
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break;
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}
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if (dir->i_sb->u.ufs_sb.s_flags & UFS_DEBUG) {
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printk("lfragno 0x%lx direct d 0x%x d_ino %u d_reclen %u d_namlen %u d_name `%s'\n",
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lfragno, (unsigned int)d, d->d_ino, d->d_reclen, d->d_namlen, d->d_name);
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}
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if ((d->d_namlen == len) &&
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/* XXX - don't use strncmp() - see ext2fs */
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(ufs_match(len, name, d))) {
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/* We have a match */
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*result = iget(dir->i_sb, d->d_ino);
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brelse(bh);
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return(0);
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} else {
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/* XXX - bounds checking */
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if (dir->i_sb->u.ufs_sb.s_flags & UFS_DEBUG) {
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printk("ufs_lookup: wanted (%s,%d) got (%s,%d)\n",
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name, len, d->d_name, d->d_namlen);
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}
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}
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d = (struct ufs_direct *)((char *)d + d->d_reclen);
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}
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brelse(bh);
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}
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return(-ENOENT);
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}
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/*
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* Local Variables: ***
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* c-indent-level: 8 ***
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* c-continued-statement-offset: 8 ***
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* c-brace-offset: -8 ***
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* c-argdecl-indent: 0 ***
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* c-label-offset: -8 ***
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* End: ***
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*/
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