Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/isofs/dir.c | |
3 | * | |
4 | * (C) 1992, 1993, 1994 Eric Youngdale Modified for ISO 9660 filesystem. | |
5 | * | |
6 | * (C) 1991 Linus Torvalds - minix filesystem | |
7 | * | |
8 | * Steve Beynon : Missing last directory entries fixed | |
9 | * (stephen@askone.demon.co.uk) : 21st June 1996 | |
c3ed85a3 | 10 | * |
1da177e4 LT |
11 | * isofs directory handling functions |
12 | */ | |
1da177e4 | 13 | #include <linux/smp_lock.h> |
5a0e3ad6 | 14 | #include <linux/gfp.h> |
94f2f715 | 15 | #include "isofs.h" |
1da177e4 | 16 | |
1da177e4 LT |
17 | int isofs_name_translate(struct iso_directory_record *de, char *new, struct inode *inode) |
18 | { | |
19 | char * old = de->name; | |
20 | int len = de->name_len[0]; | |
21 | int i; | |
c3ed85a3 | 22 | |
1da177e4 LT |
23 | for (i = 0; i < len; i++) { |
24 | unsigned char c = old[i]; | |
25 | if (!c) | |
26 | break; | |
27 | ||
28 | if (c >= 'A' && c <= 'Z') | |
29 | c |= 0x20; /* lower case */ | |
30 | ||
31 | /* Drop trailing '.;1' (ISO 9660:1988 7.5.1 requires period) */ | |
32 | if (c == '.' && i == len - 3 && old[i + 1] == ';' && old[i + 2] == '1') | |
33 | break; | |
34 | ||
35 | /* Drop trailing ';1' */ | |
36 | if (c == ';' && i == len - 2 && old[i + 1] == '1') | |
37 | break; | |
38 | ||
39 | /* Convert remaining ';' to '.' */ | |
40 | /* Also '/' to '.' (broken Acorn-generated ISO9660 images) */ | |
41 | if (c == ';' || c == '/') | |
42 | c = '.'; | |
43 | ||
44 | new[i] = c; | |
45 | } | |
46 | return i; | |
47 | } | |
48 | ||
49 | /* Acorn extensions written by Matthew Wilcox <willy@bofh.ai> 1998 */ | |
c3ed85a3 DJ |
50 | int get_acorn_filename(struct iso_directory_record *de, |
51 | char *retname, struct inode *inode) | |
1da177e4 LT |
52 | { |
53 | int std; | |
c3ed85a3 | 54 | unsigned char *chr; |
1da177e4 | 55 | int retnamlen = isofs_name_translate(de, retname, inode); |
c3ed85a3 DJ |
56 | |
57 | if (retnamlen == 0) | |
58 | return 0; | |
1da177e4 | 59 | std = sizeof(struct iso_directory_record) + de->name_len[0]; |
c3ed85a3 DJ |
60 | if (std & 1) |
61 | std++; | |
62 | if ((*((unsigned char *) de) - std) != 32) | |
63 | return retnamlen; | |
1da177e4 | 64 | chr = ((unsigned char *) de) + std; |
c3ed85a3 DJ |
65 | if (strncmp(chr, "ARCHIMEDES", 10)) |
66 | return retnamlen; | |
67 | if ((*retname == '_') && ((chr[19] & 1) == 1)) | |
68 | *retname = '!'; | |
1da177e4 | 69 | if (((de->flags[0] & 2) == 0) && (chr[13] == 0xff) |
c3ed85a3 | 70 | && ((chr[12] & 0xf0) == 0xf0)) { |
1da177e4 LT |
71 | retname[retnamlen] = ','; |
72 | sprintf(retname+retnamlen+1, "%3.3x", | |
73 | ((chr[12] & 0xf) << 8) | chr[11]); | |
74 | retnamlen += 4; | |
75 | } | |
76 | return retnamlen; | |
77 | } | |
78 | ||
79 | /* | |
80 | * This should _really_ be cleaned up some day.. | |
81 | */ | |
82 | static int do_isofs_readdir(struct inode *inode, struct file *filp, | |
83 | void *dirent, filldir_t filldir, | |
c3ed85a3 | 84 | char *tmpname, struct iso_directory_record *tmpde) |
1da177e4 LT |
85 | { |
86 | unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); | |
87 | unsigned char bufbits = ISOFS_BUFFER_BITS(inode); | |
88 | unsigned long block, offset, block_saved, offset_saved; | |
89 | unsigned long inode_number = 0; /* Quiet GCC */ | |
90 | struct buffer_head *bh = NULL; | |
91 | int len; | |
92 | int map; | |
93 | int first_de = 1; | |
94 | char *p = NULL; /* Quiet GCC */ | |
95 | struct iso_directory_record *de; | |
96 | struct isofs_sb_info *sbi = ISOFS_SB(inode->i_sb); | |
97 | ||
98 | offset = filp->f_pos & (bufsize - 1); | |
99 | block = filp->f_pos >> bufbits; | |
100 | ||
101 | while (filp->f_pos < inode->i_size) { | |
102 | int de_len; | |
103 | ||
104 | if (!bh) { | |
105 | bh = isofs_bread(inode, block); | |
106 | if (!bh) | |
107 | return 0; | |
108 | } | |
109 | ||
110 | de = (struct iso_directory_record *) (bh->b_data + offset); | |
111 | ||
112 | de_len = *(unsigned char *) de; | |
113 | ||
c3ed85a3 DJ |
114 | /* |
115 | * If the length byte is zero, we should move on to the next | |
116 | * CDROM sector. If we are at the end of the directory, we | |
117 | * kick out of the while loop. | |
118 | */ | |
1da177e4 LT |
119 | |
120 | if (de_len == 0) { | |
121 | brelse(bh); | |
122 | bh = NULL; | |
123 | filp->f_pos = (filp->f_pos + ISOFS_BLOCK_SIZE) & ~(ISOFS_BLOCK_SIZE - 1); | |
124 | block = filp->f_pos >> bufbits; | |
125 | offset = 0; | |
126 | continue; | |
127 | } | |
128 | ||
129 | block_saved = block; | |
130 | offset_saved = offset; | |
131 | offset += de_len; | |
132 | ||
133 | /* Make sure we have a full directory entry */ | |
134 | if (offset >= bufsize) { | |
135 | int slop = bufsize - offset + de_len; | |
136 | memcpy(tmpde, de, slop); | |
137 | offset &= bufsize - 1; | |
138 | block++; | |
139 | brelse(bh); | |
140 | bh = NULL; | |
141 | if (offset) { | |
142 | bh = isofs_bread(inode, block); | |
143 | if (!bh) | |
144 | return 0; | |
145 | memcpy((void *) tmpde + slop, bh->b_data, offset); | |
146 | } | |
147 | de = tmpde; | |
148 | } | |
2deb1acc JK |
149 | /* Basic sanity check, whether name doesn't exceed dir entry */ |
150 | if (de_len < de->name_len[0] + | |
151 | sizeof(struct iso_directory_record)) { | |
152 | printk(KERN_NOTICE "iso9660: Corrupted directory entry" | |
153 | " in block %lu of inode %lu\n", block, | |
154 | inode->i_ino); | |
155 | return -EIO; | |
156 | } | |
1da177e4 LT |
157 | |
158 | if (first_de) { | |
159 | isofs_normalize_block_and_offset(de, | |
c3ed85a3 DJ |
160 | &block_saved, |
161 | &offset_saved); | |
1da177e4 | 162 | inode_number = isofs_get_ino(block_saved, |
c3ed85a3 | 163 | offset_saved, bufbits); |
1da177e4 LT |
164 | } |
165 | ||
166 | if (de->flags[-sbi->s_high_sierra] & 0x80) { | |
167 | first_de = 0; | |
168 | filp->f_pos += de_len; | |
169 | continue; | |
170 | } | |
171 | first_de = 1; | |
172 | ||
173 | /* Handle the case of the '.' directory */ | |
174 | if (de->name_len[0] == 1 && de->name[0] == 0) { | |
175 | if (filldir(dirent, ".", 1, filp->f_pos, inode->i_ino, DT_DIR) < 0) | |
176 | break; | |
177 | filp->f_pos += de_len; | |
178 | continue; | |
179 | } | |
180 | ||
181 | len = 0; | |
182 | ||
183 | /* Handle the case of the '..' directory */ | |
184 | if (de->name_len[0] == 1 && de->name[0] == 1) { | |
2485822d | 185 | inode_number = parent_ino(filp->f_path.dentry); |
1da177e4 LT |
186 | if (filldir(dirent, "..", 2, filp->f_pos, inode_number, DT_DIR) < 0) |
187 | break; | |
188 | filp->f_pos += de_len; | |
189 | continue; | |
190 | } | |
191 | ||
192 | /* Handle everything else. Do name translation if there | |
193 | is no Rock Ridge NM field. */ | |
9769f4eb JW |
194 | |
195 | /* | |
196 | * Do not report hidden files if so instructed, or associated | |
197 | * files unless instructed to do so | |
198 | */ | |
5404ac8e JK |
199 | if ((sbi->s_hide && (de->flags[-sbi->s_high_sierra] & 1)) || |
200 | (!sbi->s_showassoc && | |
9769f4eb JW |
201 | (de->flags[-sbi->s_high_sierra] & 4))) { |
202 | filp->f_pos += de_len; | |
203 | continue; | |
1da177e4 LT |
204 | } |
205 | ||
206 | map = 1; | |
207 | if (sbi->s_rock) { | |
208 | len = get_rock_ridge_filename(de, tmpname, inode); | |
209 | if (len != 0) { /* may be -1 */ | |
210 | p = tmpname; | |
211 | map = 0; | |
212 | } | |
213 | } | |
214 | if (map) { | |
215 | #ifdef CONFIG_JOLIET | |
216 | if (sbi->s_joliet_level) { | |
217 | len = get_joliet_filename(de, tmpname, inode); | |
218 | p = tmpname; | |
219 | } else | |
220 | #endif | |
221 | if (sbi->s_mapping == 'a') { | |
222 | len = get_acorn_filename(de, tmpname, inode); | |
223 | p = tmpname; | |
224 | } else | |
225 | if (sbi->s_mapping == 'n') { | |
226 | len = isofs_name_translate(de, tmpname, inode); | |
227 | p = tmpname; | |
228 | } else { | |
229 | p = de->name; | |
230 | len = de->name_len[0]; | |
231 | } | |
232 | } | |
233 | if (len > 0) { | |
234 | if (filldir(dirent, p, len, filp->f_pos, inode_number, DT_UNKNOWN) < 0) | |
235 | break; | |
236 | } | |
237 | filp->f_pos += de_len; | |
238 | ||
239 | continue; | |
240 | } | |
c3ed85a3 DJ |
241 | if (bh) |
242 | brelse(bh); | |
1da177e4 LT |
243 | return 0; |
244 | } | |
245 | ||
246 | /* | |
247 | * Handle allocation of temporary space for name translation and | |
248 | * handling split directory entries.. The real work is done by | |
249 | * "do_isofs_readdir()". | |
250 | */ | |
251 | static int isofs_readdir(struct file *filp, | |
252 | void *dirent, filldir_t filldir) | |
253 | { | |
254 | int result; | |
c3ed85a3 DJ |
255 | char *tmpname; |
256 | struct iso_directory_record *tmpde; | |
2485822d | 257 | struct inode *inode = filp->f_path.dentry->d_inode; |
1da177e4 LT |
258 | |
259 | tmpname = (char *)__get_free_page(GFP_KERNEL); | |
260 | if (tmpname == NULL) | |
261 | return -ENOMEM; | |
262 | ||
263 | lock_kernel(); | |
264 | tmpde = (struct iso_directory_record *) (tmpname+1024); | |
265 | ||
266 | result = do_isofs_readdir(inode, filp, dirent, filldir, tmpname, tmpde); | |
267 | ||
268 | free_page((unsigned long) tmpname); | |
269 | unlock_kernel(); | |
270 | return result; | |
271 | } | |
c3ed85a3 DJ |
272 | |
273 | const struct file_operations isofs_dir_operations = | |
274 | { | |
ca572727 | 275 | .llseek = generic_file_llseek, |
c3ed85a3 DJ |
276 | .read = generic_read_dir, |
277 | .readdir = isofs_readdir, | |
278 | }; | |
279 | ||
280 | /* | |
281 | * directories can handle most operations... | |
282 | */ | |
283 | const struct inode_operations isofs_dir_inode_operations = | |
284 | { | |
285 | .lookup = isofs_lookup, | |
286 | }; | |
287 | ||
288 |