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 | */ | |
5a0e3ad6 | 13 | #include <linux/gfp.h> |
94f2f715 | 14 | #include "isofs.h" |
1da177e4 | 15 | |
1da177e4 LT |
16 | int isofs_name_translate(struct iso_directory_record *de, char *new, struct inode *inode) |
17 | { | |
18 | char * old = de->name; | |
19 | int len = de->name_len[0]; | |
20 | int i; | |
c3ed85a3 | 21 | |
1da177e4 LT |
22 | for (i = 0; i < len; i++) { |
23 | unsigned char c = old[i]; | |
24 | if (!c) | |
25 | break; | |
26 | ||
27 | if (c >= 'A' && c <= 'Z') | |
28 | c |= 0x20; /* lower case */ | |
29 | ||
30 | /* Drop trailing '.;1' (ISO 9660:1988 7.5.1 requires period) */ | |
31 | if (c == '.' && i == len - 3 && old[i + 1] == ';' && old[i + 2] == '1') | |
32 | break; | |
33 | ||
34 | /* Drop trailing ';1' */ | |
35 | if (c == ';' && i == len - 2 && old[i + 1] == '1') | |
36 | break; | |
37 | ||
38 | /* Convert remaining ';' to '.' */ | |
39 | /* Also '/' to '.' (broken Acorn-generated ISO9660 images) */ | |
40 | if (c == ';' || c == '/') | |
41 | c = '.'; | |
42 | ||
43 | new[i] = c; | |
44 | } | |
45 | return i; | |
46 | } | |
47 | ||
48 | /* Acorn extensions written by Matthew Wilcox <willy@bofh.ai> 1998 */ | |
c3ed85a3 DJ |
49 | int get_acorn_filename(struct iso_directory_record *de, |
50 | char *retname, struct inode *inode) | |
1da177e4 LT |
51 | { |
52 | int std; | |
c3ed85a3 | 53 | unsigned char *chr; |
1da177e4 | 54 | int retnamlen = isofs_name_translate(de, retname, inode); |
c3ed85a3 DJ |
55 | |
56 | if (retnamlen == 0) | |
57 | return 0; | |
1da177e4 | 58 | std = sizeof(struct iso_directory_record) + de->name_len[0]; |
c3ed85a3 DJ |
59 | if (std & 1) |
60 | std++; | |
61 | if ((*((unsigned char *) de) - std) != 32) | |
62 | return retnamlen; | |
1da177e4 | 63 | chr = ((unsigned char *) de) + std; |
c3ed85a3 DJ |
64 | if (strncmp(chr, "ARCHIMEDES", 10)) |
65 | return retnamlen; | |
66 | if ((*retname == '_') && ((chr[19] & 1) == 1)) | |
67 | *retname = '!'; | |
1da177e4 | 68 | if (((de->flags[0] & 2) == 0) && (chr[13] == 0xff) |
c3ed85a3 | 69 | && ((chr[12] & 0xf0) == 0xf0)) { |
1da177e4 LT |
70 | retname[retnamlen] = ','; |
71 | sprintf(retname+retnamlen+1, "%3.3x", | |
72 | ((chr[12] & 0xf) << 8) | chr[11]); | |
73 | retnamlen += 4; | |
74 | } | |
75 | return retnamlen; | |
76 | } | |
77 | ||
78 | /* | |
79 | * This should _really_ be cleaned up some day.. | |
80 | */ | |
bfee7169 AV |
81 | static int do_isofs_readdir(struct inode *inode, struct file *file, |
82 | struct dir_context *ctx, | |
c3ed85a3 | 83 | char *tmpname, struct iso_directory_record *tmpde) |
1da177e4 LT |
84 | { |
85 | unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); | |
86 | unsigned char bufbits = ISOFS_BUFFER_BITS(inode); | |
87 | unsigned long block, offset, block_saved, offset_saved; | |
88 | unsigned long inode_number = 0; /* Quiet GCC */ | |
89 | struct buffer_head *bh = NULL; | |
90 | int len; | |
91 | int map; | |
92 | int first_de = 1; | |
93 | char *p = NULL; /* Quiet GCC */ | |
94 | struct iso_directory_record *de; | |
95 | struct isofs_sb_info *sbi = ISOFS_SB(inode->i_sb); | |
96 | ||
bfee7169 AV |
97 | offset = ctx->pos & (bufsize - 1); |
98 | block = ctx->pos >> bufbits; | |
1da177e4 | 99 | |
bfee7169 | 100 | while (ctx->pos < inode->i_size) { |
1da177e4 LT |
101 | int de_len; |
102 | ||
103 | if (!bh) { | |
104 | bh = isofs_bread(inode, block); | |
105 | if (!bh) | |
106 | return 0; | |
107 | } | |
108 | ||
109 | de = (struct iso_directory_record *) (bh->b_data + offset); | |
110 | ||
bfee7169 | 111 | de_len = *(unsigned char *)de; |
1da177e4 | 112 | |
c3ed85a3 DJ |
113 | /* |
114 | * If the length byte is zero, we should move on to the next | |
115 | * CDROM sector. If we are at the end of the directory, we | |
116 | * kick out of the while loop. | |
117 | */ | |
1da177e4 LT |
118 | |
119 | if (de_len == 0) { | |
120 | brelse(bh); | |
121 | bh = NULL; | |
bfee7169 AV |
122 | ctx->pos = (ctx->pos + ISOFS_BLOCK_SIZE) & ~(ISOFS_BLOCK_SIZE - 1); |
123 | block = ctx->pos >> bufbits; | |
1da177e4 LT |
124 | offset = 0; |
125 | continue; | |
126 | } | |
127 | ||
128 | block_saved = block; | |
129 | offset_saved = offset; | |
130 | offset += de_len; | |
131 | ||
132 | /* Make sure we have a full directory entry */ | |
133 | if (offset >= bufsize) { | |
134 | int slop = bufsize - offset + de_len; | |
135 | memcpy(tmpde, de, slop); | |
136 | offset &= bufsize - 1; | |
137 | block++; | |
138 | brelse(bh); | |
139 | bh = NULL; | |
140 | if (offset) { | |
141 | bh = isofs_bread(inode, block); | |
142 | if (!bh) | |
143 | return 0; | |
144 | memcpy((void *) tmpde + slop, bh->b_data, offset); | |
145 | } | |
146 | de = tmpde; | |
147 | } | |
2deb1acc JK |
148 | /* Basic sanity check, whether name doesn't exceed dir entry */ |
149 | if (de_len < de->name_len[0] + | |
150 | sizeof(struct iso_directory_record)) { | |
151 | printk(KERN_NOTICE "iso9660: Corrupted directory entry" | |
152 | " in block %lu of inode %lu\n", block, | |
153 | inode->i_ino); | |
154 | return -EIO; | |
155 | } | |
1da177e4 LT |
156 | |
157 | if (first_de) { | |
158 | isofs_normalize_block_and_offset(de, | |
c3ed85a3 DJ |
159 | &block_saved, |
160 | &offset_saved); | |
1da177e4 | 161 | inode_number = isofs_get_ino(block_saved, |
c3ed85a3 | 162 | offset_saved, bufbits); |
1da177e4 LT |
163 | } |
164 | ||
165 | if (de->flags[-sbi->s_high_sierra] & 0x80) { | |
166 | first_de = 0; | |
bfee7169 | 167 | ctx->pos += de_len; |
1da177e4 LT |
168 | continue; |
169 | } | |
170 | first_de = 1; | |
171 | ||
172 | /* Handle the case of the '.' directory */ | |
173 | if (de->name_len[0] == 1 && de->name[0] == 0) { | |
bfee7169 | 174 | if (!dir_emit_dot(file, ctx)) |
1da177e4 | 175 | break; |
bfee7169 | 176 | ctx->pos += de_len; |
1da177e4 LT |
177 | continue; |
178 | } | |
179 | ||
180 | len = 0; | |
181 | ||
182 | /* Handle the case of the '..' directory */ | |
183 | if (de->name_len[0] == 1 && de->name[0] == 1) { | |
bfee7169 | 184 | if (!dir_emit_dotdot(file, ctx)) |
1da177e4 | 185 | break; |
bfee7169 | 186 | ctx->pos += de_len; |
1da177e4 LT |
187 | continue; |
188 | } | |
189 | ||
190 | /* Handle everything else. Do name translation if there | |
191 | is no Rock Ridge NM field. */ | |
9769f4eb JW |
192 | |
193 | /* | |
194 | * Do not report hidden files if so instructed, or associated | |
195 | * files unless instructed to do so | |
196 | */ | |
5404ac8e JK |
197 | if ((sbi->s_hide && (de->flags[-sbi->s_high_sierra] & 1)) || |
198 | (!sbi->s_showassoc && | |
9769f4eb | 199 | (de->flags[-sbi->s_high_sierra] & 4))) { |
bfee7169 | 200 | ctx->pos += de_len; |
9769f4eb | 201 | continue; |
1da177e4 LT |
202 | } |
203 | ||
204 | map = 1; | |
205 | if (sbi->s_rock) { | |
206 | len = get_rock_ridge_filename(de, tmpname, inode); | |
207 | if (len != 0) { /* may be -1 */ | |
208 | p = tmpname; | |
209 | map = 0; | |
210 | } | |
211 | } | |
212 | if (map) { | |
213 | #ifdef CONFIG_JOLIET | |
214 | if (sbi->s_joliet_level) { | |
215 | len = get_joliet_filename(de, tmpname, inode); | |
216 | p = tmpname; | |
217 | } else | |
218 | #endif | |
219 | if (sbi->s_mapping == 'a') { | |
220 | len = get_acorn_filename(de, tmpname, inode); | |
221 | p = tmpname; | |
222 | } else | |
223 | if (sbi->s_mapping == 'n') { | |
224 | len = isofs_name_translate(de, tmpname, inode); | |
225 | p = tmpname; | |
226 | } else { | |
227 | p = de->name; | |
228 | len = de->name_len[0]; | |
229 | } | |
230 | } | |
231 | if (len > 0) { | |
bfee7169 | 232 | if (!dir_emit(ctx, p, len, inode_number, DT_UNKNOWN)) |
1da177e4 LT |
233 | break; |
234 | } | |
bfee7169 | 235 | ctx->pos += de_len; |
1da177e4 LT |
236 | |
237 | continue; | |
238 | } | |
c3ed85a3 DJ |
239 | if (bh) |
240 | brelse(bh); | |
1da177e4 LT |
241 | return 0; |
242 | } | |
243 | ||
244 | /* | |
245 | * Handle allocation of temporary space for name translation and | |
246 | * handling split directory entries.. The real work is done by | |
247 | * "do_isofs_readdir()". | |
248 | */ | |
bfee7169 | 249 | static int isofs_readdir(struct file *file, struct dir_context *ctx) |
1da177e4 LT |
250 | { |
251 | int result; | |
c3ed85a3 DJ |
252 | char *tmpname; |
253 | struct iso_directory_record *tmpde; | |
bfee7169 | 254 | struct inode *inode = file_inode(file); |
1da177e4 LT |
255 | |
256 | tmpname = (char *)__get_free_page(GFP_KERNEL); | |
257 | if (tmpname == NULL) | |
258 | return -ENOMEM; | |
259 | ||
1da177e4 LT |
260 | tmpde = (struct iso_directory_record *) (tmpname+1024); |
261 | ||
bfee7169 | 262 | result = do_isofs_readdir(inode, file, ctx, tmpname, tmpde); |
1da177e4 LT |
263 | |
264 | free_page((unsigned long) tmpname); | |
1da177e4 LT |
265 | return result; |
266 | } | |
c3ed85a3 DJ |
267 | |
268 | const struct file_operations isofs_dir_operations = | |
269 | { | |
ca572727 | 270 | .llseek = generic_file_llseek, |
c3ed85a3 | 271 | .read = generic_read_dir, |
bfee7169 | 272 | .iterate = isofs_readdir, |
c3ed85a3 DJ |
273 | }; |
274 | ||
275 | /* | |
276 | * directories can handle most operations... | |
277 | */ | |
278 | const struct inode_operations isofs_dir_inode_operations = | |
279 | { | |
280 | .lookup = isofs_lookup, | |
281 | }; | |
282 | ||
283 |