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>
20 #include <linux/dcache.h>
22 #include <asm/uaccess.h>
25 * ok, we cannot use strncmp, as the name is not in our data space.
26 * Thus we'll have to use isofs_match. No big problem. Match also makes
30 isofs_cmp(struct dentry * dentry, const char * compare, int dlen)
37 /* check special "." and ".." files */
40 if (compare[0] == 0) {
41 if (!dentry->d_name.len)
44 } else if (compare[0] == 1) {
52 return dentry->d_op->d_compare(dentry, &dentry->d_name, &qstr);
58 * finds an entry in the specified directory with the wanted name. It
59 * returns the inode number of the found entry, or 0 on error.
62 isofs_find_entry(struct inode *dir, struct dentry *dentry,
63 unsigned long *block_rv, unsigned long* offset_rv,
64 char * tmpname, struct iso_directory_record * tmpde)
66 unsigned long bufsize = ISOFS_BUFFER_SIZE(dir);
67 unsigned char bufbits = ISOFS_BUFFER_BITS(dir);
68 unsigned long block, f_pos, offset, block_saved, offset_saved;
69 struct buffer_head * bh = NULL;
70 struct isofs_sb_info *sbi = ISOFS_SB(dir->i_sb);
72 if (!ISOFS_I(dir)->i_first_extent)
79 while (f_pos < dir->i_size) {
80 struct iso_directory_record * de;
81 int de_len, match, i, dlen;
85 bh = isofs_bread(dir, block);
90 de = (struct iso_directory_record *) (bh->b_data + offset);
92 de_len = *(unsigned char *) de;
96 f_pos = (f_pos + ISOFS_BLOCK_SIZE) & ~(ISOFS_BLOCK_SIZE - 1);
97 block = f_pos >> bufbits;
102 block_saved = bh->b_blocknr;
103 offset_saved = offset;
107 /* Make sure we have a full directory entry */
108 if (offset >= bufsize) {
109 int slop = bufsize - offset + de_len;
110 memcpy(tmpde, de, slop);
111 offset &= bufsize - 1;
116 bh = isofs_bread(dir, block);
119 memcpy((void *) tmpde + slop, bh->b_data, offset);
124 dlen = de->name_len[0];
128 ((i = get_rock_ridge_filename(de, tmpname, dir)))) {
129 dlen = i; /* possibly -1 */
132 } else if (sbi->s_joliet_level) {
133 dlen = get_joliet_filename(de, tmpname, dir);
136 } else if (sbi->s_mapping == 'a') {
137 dlen = get_acorn_filename(de, tmpname, dir);
139 } else if (sbi->s_mapping == 'n') {
140 dlen = isofs_name_translate(de, tmpname, dir);
145 * Skip hidden or associated files unless unhide is set
149 (!(de->flags[-sbi->s_high_sierra] & 5)
150 || sbi->s_unhide == 'y'))
152 match = (isofs_cmp(dentry,dpnt,dlen) == 0);
155 isofs_normalize_block_and_offset(de,
158 *block_rv = block_saved;
159 *offset_rv = offset_saved;
168 struct dentry *isofs_lookup(struct inode * dir, struct dentry * dentry, struct nameidata *nd)
171 unsigned long block, offset;
175 dentry->d_op = dir->i_sb->s_root->d_op;
177 page = alloc_page(GFP_USER);
179 return ERR_PTR(-ENOMEM);
182 found = isofs_find_entry(dir, dentry,
185 1024 + page_address(page));
190 inode = isofs_iget(dir->i_sb, block, offset);
193 return ERR_PTR(-EACCES);
198 return d_splice_alias(inode, dentry);
199 d_add(dentry, inode);