2 * linux/fs/isofs/namei.c
4 * (C) 1992 Eric Youngdale Modified for ISO 9660 filesystem.
6 * (C) 1991 Linus Torvalds - minix filesystem
13 * ok, we cannot use strncmp, as the name is not in our data space.
14 * Thus we'll have to use isofs_match. No big problem. Match also makes
18 isofs_cmp(struct dentry
*dentry
, const char *compare
, int dlen
)
25 /* check special "." and ".." files */
28 if (compare
[0] == 0) {
29 if (!dentry
->d_name
.len
)
32 } else if (compare
[0] == 1) {
40 return dentry
->d_op
->d_compare(dentry
, &dentry
->d_name
, &qstr
);
46 * finds an entry in the specified directory with the wanted name. It
47 * returns the inode number of the found entry, or 0 on error.
50 isofs_find_entry(struct inode
*dir
, struct dentry
*dentry
,
51 unsigned long *block_rv
, unsigned long *offset_rv
,
52 char *tmpname
, struct iso_directory_record
*tmpde
)
54 unsigned long bufsize
= ISOFS_BUFFER_SIZE(dir
);
55 unsigned char bufbits
= ISOFS_BUFFER_BITS(dir
);
56 unsigned long block
, f_pos
, offset
, block_saved
, offset_saved
;
57 struct buffer_head
*bh
= NULL
;
58 struct isofs_sb_info
*sbi
= ISOFS_SB(dir
->i_sb
);
60 if (!ISOFS_I(dir
)->i_first_extent
)
67 while (f_pos
< dir
->i_size
) {
68 struct iso_directory_record
*de
;
69 int de_len
, match
, i
, dlen
;
73 bh
= isofs_bread(dir
, block
);
78 de
= (struct iso_directory_record
*) (bh
->b_data
+ offset
);
80 de_len
= *(unsigned char *) de
;
84 f_pos
= (f_pos
+ ISOFS_BLOCK_SIZE
) & ~(ISOFS_BLOCK_SIZE
- 1);
85 block
= f_pos
>> bufbits
;
90 block_saved
= bh
->b_blocknr
;
91 offset_saved
= offset
;
95 /* Make sure we have a full directory entry */
96 if (offset
>= bufsize
) {
97 int slop
= bufsize
- offset
+ de_len
;
98 memcpy(tmpde
, de
, slop
);
99 offset
&= bufsize
- 1;
104 bh
= isofs_bread(dir
, block
);
107 memcpy((void *) tmpde
+ slop
, bh
->b_data
, offset
);
112 dlen
= de
->name_len
[0];
114 /* Basic sanity check, whether name doesn't exceed dir entry */
115 if (de_len
< dlen
+ sizeof(struct iso_directory_record
)) {
116 printk(KERN_NOTICE
"iso9660: Corrupted directory entry"
117 " in block %lu of inode %lu\n", block
,
123 ((i
= get_rock_ridge_filename(de
, tmpname
, dir
)))) {
124 dlen
= i
; /* possibly -1 */
127 } else if (sbi
->s_joliet_level
) {
128 dlen
= get_joliet_filename(de
, tmpname
, dir
);
131 } else if (sbi
->s_mapping
== 'a') {
132 dlen
= get_acorn_filename(de
, tmpname
, dir
);
134 } else if (sbi
->s_mapping
== 'n') {
135 dlen
= isofs_name_translate(de
, tmpname
, dir
);
140 * Skip hidden or associated files unless hide or showassoc,
141 * respectively, is set
146 (!(de
->flags
[-sbi
->s_high_sierra
] & 1))) &&
148 (!(de
->flags
[-sbi
->s_high_sierra
] & 4)))) {
149 match
= (isofs_cmp(dentry
, dpnt
, dlen
) == 0);
152 isofs_normalize_block_and_offset(de
,
155 *block_rv
= block_saved
;
156 *offset_rv
= offset_saved
;
165 struct dentry
*isofs_lookup(struct inode
*dir
, struct dentry
*dentry
, struct nameidata
*nd
)
168 unsigned long uninitialized_var(block
);
169 unsigned long uninitialized_var(offset
);
170 struct isofs_sb_info
*sbi
= ISOFS_SB(dir
->i_sb
);
174 dentry
->d_op
= dir
->i_sb
->s_root
->d_op
;
176 page
= alloc_page(GFP_USER
);
178 return ERR_PTR(-ENOMEM
);
180 mutex_lock(&sbi
->s_mutex
);
181 found
= isofs_find_entry(dir
, dentry
,
184 1024 + page_address(page
));
189 inode
= isofs_iget(dir
->i_sb
, block
, offset
);
191 mutex_unlock(&sbi
->s_mutex
);
192 return ERR_CAST(inode
);
195 mutex_unlock(&sbi
->s_mutex
);
196 return d_splice_alias(inode
, dentry
);
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