2 * linux/fs/isofs/namei.c
4 * (C) 1992 Eric Youngdale Modified for ISO 9660 filesystem.
6 * (C) 1991 Linus Torvalds - minix filesystem
9 #include <linux/time.h>
10 #include <linux/iso_fs.h>
11 #include <linux/kernel.h>
12 #include <linux/string.h>
13 #include <linux/stat.h>
14 #include <linux/fcntl.h>
16 #include <linux/errno.h>
17 #include <linux/config.h> /* Joliet? */
18 #include <linux/smp_lock.h>
19 #include <linux/buffer_head.h>
21 #include <asm/uaccess.h>
24 * ok, we cannot use strncmp, as the name is not in our data space.
25 * Thus we'll have to use isofs_match. No big problem. Match also makes
29 isofs_cmp(struct dentry * dentry, const char * compare, int dlen)
36 /* check special "." and ".." files */
39 if (compare[0] == 0) {
40 if (!dentry->d_name.len)
43 } else if (compare[0] == 1) {
51 return dentry->d_op->d_compare(dentry, &dentry->d_name, &qstr);
57 * finds an entry in the specified directory with the wanted name. It
58 * returns the inode number of the found entry, or 0 on error.
61 isofs_find_entry(struct inode *dir, struct dentry *dentry,
62 char * tmpname, struct iso_directory_record * tmpde)
64 unsigned long inode_number;
65 unsigned long bufsize = ISOFS_BUFFER_SIZE(dir);
66 unsigned char bufbits = ISOFS_BUFFER_BITS(dir);
67 unsigned int block, f_pos, offset;
68 struct buffer_head * bh = NULL;
69 struct isofs_sb_info *sbi = ISOFS_SB(dir->i_sb);
71 if (!ISOFS_I(dir)->i_first_extent)
78 while (f_pos < dir->i_size) {
79 struct iso_directory_record * de;
80 int de_len, match, i, dlen;
84 bh = isofs_bread(dir, block);
89 de = (struct iso_directory_record *) (bh->b_data + offset);
90 inode_number = (bh->b_blocknr << bufbits) + offset;
92 de_len = *(unsigned char *) de;
96 f_pos = (f_pos + ISOFS_BLOCK_SIZE) & ~(ISOFS_BLOCK_SIZE - 1);
97 block = f_pos >> bufbits;
105 /* Make sure we have a full directory entry */
106 if (offset >= bufsize) {
107 int slop = bufsize - offset + de_len;
108 memcpy(tmpde, de, slop);
109 offset &= bufsize - 1;
114 bh = isofs_bread(dir, block);
117 memcpy((void *) tmpde + slop, bh->b_data, offset);
122 dlen = de->name_len[0];
126 ((i = get_rock_ridge_filename(de, tmpname, dir)))) {
127 dlen = i; /* possibly -1 */
130 } else if (sbi->s_joliet_level) {
131 dlen = get_joliet_filename(de, tmpname, dir);
134 } else if (sbi->s_mapping == 'a') {
135 dlen = get_acorn_filename(de, tmpname, dir);
137 } else if (sbi->s_mapping == 'n') {
138 dlen = isofs_name_translate(de, tmpname, dir);
143 * Skip hidden or associated files unless unhide is set
147 (!(de->flags[-sbi->s_high_sierra] & 5)
148 || sbi->s_unhide == 'y'))
150 match = (isofs_cmp(dentry,dpnt,dlen) == 0);
161 struct dentry *isofs_lookup(struct inode * dir, struct dentry * dentry, struct nameidata *nd)
167 dentry->d_op = dir->i_sb->s_root->d_op;
169 page = alloc_page(GFP_USER);
171 return ERR_PTR(-ENOMEM);
174 ino = isofs_find_entry(dir, dentry, page_address(page),
175 1024 + page_address(page));
180 inode = iget(dir->i_sb, ino);
183 return ERR_PTR(-EACCES);
187 d_add(dentry, inode);