Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/isofs/rock.c | |
3 | * | |
4 | * (C) 1992, 1993 Eric Youngdale | |
5 | * | |
6 | * Rock Ridge Extensions to iso9660 | |
7 | */ | |
8 | ||
1da177e4 LT |
9 | #include <linux/slab.h> |
10 | #include <linux/pagemap.h> | |
1da177e4 | 11 | |
94f2f715 | 12 | #include "isofs.h" |
1da177e4 LT |
13 | #include "rock.h" |
14 | ||
7373909d AM |
15 | /* |
16 | * These functions are designed to read the system areas of a directory record | |
1da177e4 LT |
17 | * and extract relevant information. There are different functions provided |
18 | * depending upon what information we need at the time. One function fills | |
19 | * out an inode structure, a second one extracts a filename, a third one | |
20 | * returns a symbolic link name, and a fourth one returns the extent number | |
7373909d AM |
21 | * for the file. |
22 | */ | |
1da177e4 | 23 | |
1d372116 | 24 | #define SIG(A,B) ((A) | ((B) << 8)) /* isonum_721() */ |
1da177e4 | 25 | |
ba40aaf0 AM |
26 | struct rock_state { |
27 | void *buffer; | |
28 | unsigned char *chr; | |
29 | int len; | |
30 | int cont_size; | |
31 | int cont_extent; | |
32 | int cont_offset; | |
33 | struct inode *inode; | |
34 | }; | |
35 | ||
12121714 AM |
36 | /* |
37 | * This is a way of ensuring that we have something in the system | |
7373909d | 38 | * use fields that is compatible with Rock Ridge. Return zero on success. |
12121714 AM |
39 | */ |
40 | ||
41 | static int check_sp(struct rock_ridge *rr, struct inode *inode) | |
42 | { | |
43 | if (rr->u.SP.magic[0] != 0xbe) | |
44 | return -1; | |
45 | if (rr->u.SP.magic[1] != 0xef) | |
46 | return -1; | |
47 | ISOFS_SB(inode->i_sb)->s_rock_offset = rr->u.SP.skip; | |
48 | return 0; | |
49 | } | |
50 | ||
76ab07eb | 51 | static void setup_rock_ridge(struct iso_directory_record *de, |
ba40aaf0 | 52 | struct inode *inode, struct rock_state *rs) |
76ab07eb | 53 | { |
ba40aaf0 AM |
54 | rs->len = sizeof(struct iso_directory_record) + de->name_len[0]; |
55 | if (rs->len & 1) | |
56 | (rs->len)++; | |
57 | rs->chr = (unsigned char *)de + rs->len; | |
58 | rs->len = *((unsigned char *)de) - rs->len; | |
59 | if (rs->len < 0) | |
60 | rs->len = 0; | |
76ab07eb AM |
61 | |
62 | if (ISOFS_SB(inode->i_sb)->s_rock_offset != -1) { | |
ba40aaf0 AM |
63 | rs->len -= ISOFS_SB(inode->i_sb)->s_rock_offset; |
64 | rs->chr += ISOFS_SB(inode->i_sb)->s_rock_offset; | |
65 | if (rs->len < 0) | |
66 | rs->len = 0; | |
76ab07eb | 67 | } |
1d372116 | 68 | } |
1da177e4 | 69 | |
ba40aaf0 AM |
70 | static void init_rock_state(struct rock_state *rs, struct inode *inode) |
71 | { | |
72 | memset(rs, 0, sizeof(*rs)); | |
73 | rs->inode = inode; | |
74 | } | |
75 | ||
76 | /* | |
77 | * Returns 0 if the caller should continue scanning, 1 if the scan must end | |
78 | * and -ve on error. | |
79 | */ | |
80 | static int rock_continue(struct rock_state *rs) | |
81 | { | |
82 | int ret = 1; | |
e595447e AM |
83 | int blocksize = 1 << rs->inode->i_blkbits; |
84 | const int min_de_size = offsetof(struct rock_ridge, u); | |
ba40aaf0 AM |
85 | |
86 | kfree(rs->buffer); | |
87 | rs->buffer = NULL; | |
e595447e AM |
88 | |
89 | if ((unsigned)rs->cont_offset > blocksize - min_de_size || | |
90 | (unsigned)rs->cont_size > blocksize || | |
91 | (unsigned)(rs->cont_offset + rs->cont_size) > blocksize) { | |
92 | printk(KERN_NOTICE "rock: corrupted directory entry. " | |
93 | "extent=%d, offset=%d, size=%d\n", | |
94 | rs->cont_extent, rs->cont_offset, rs->cont_size); | |
95 | ret = -EIO; | |
96 | goto out; | |
97 | } | |
98 | ||
ba40aaf0 AM |
99 | if (rs->cont_extent) { |
100 | struct buffer_head *bh; | |
101 | ||
102 | rs->buffer = kmalloc(rs->cont_size, GFP_KERNEL); | |
103 | if (!rs->buffer) { | |
104 | ret = -ENOMEM; | |
105 | goto out; | |
106 | } | |
107 | ret = -EIO; | |
108 | bh = sb_bread(rs->inode->i_sb, rs->cont_extent); | |
109 | if (bh) { | |
110 | memcpy(rs->buffer, bh->b_data + rs->cont_offset, | |
111 | rs->cont_size); | |
112 | put_bh(bh); | |
113 | rs->chr = rs->buffer; | |
114 | rs->len = rs->cont_size; | |
115 | rs->cont_extent = 0; | |
116 | rs->cont_size = 0; | |
117 | rs->cont_offset = 0; | |
118 | return 0; | |
119 | } | |
120 | printk("Unable to read rock-ridge attributes\n"); | |
121 | } | |
122 | out: | |
123 | kfree(rs->buffer); | |
124 | rs->buffer = NULL; | |
125 | return ret; | |
126 | } | |
1da177e4 | 127 | |
f2966632 AM |
128 | /* |
129 | * We think there's a record of type `sig' at rs->chr. Parse the signature | |
130 | * and make sure that there's really room for a record of that type. | |
131 | */ | |
132 | static int rock_check_overflow(struct rock_state *rs, int sig) | |
133 | { | |
134 | int len; | |
135 | ||
136 | switch (sig) { | |
137 | case SIG('S', 'P'): | |
138 | len = sizeof(struct SU_SP_s); | |
139 | break; | |
140 | case SIG('C', 'E'): | |
141 | len = sizeof(struct SU_CE_s); | |
142 | break; | |
143 | case SIG('E', 'R'): | |
144 | len = sizeof(struct SU_ER_s); | |
145 | break; | |
146 | case SIG('R', 'R'): | |
147 | len = sizeof(struct RR_RR_s); | |
148 | break; | |
149 | case SIG('P', 'X'): | |
150 | len = sizeof(struct RR_PX_s); | |
151 | break; | |
152 | case SIG('P', 'N'): | |
153 | len = sizeof(struct RR_PN_s); | |
154 | break; | |
155 | case SIG('S', 'L'): | |
156 | len = sizeof(struct RR_SL_s); | |
157 | break; | |
158 | case SIG('N', 'M'): | |
159 | len = sizeof(struct RR_NM_s); | |
160 | break; | |
161 | case SIG('C', 'L'): | |
162 | len = sizeof(struct RR_CL_s); | |
163 | break; | |
164 | case SIG('P', 'L'): | |
165 | len = sizeof(struct RR_PL_s); | |
166 | break; | |
167 | case SIG('T', 'F'): | |
168 | len = sizeof(struct RR_TF_s); | |
169 | break; | |
170 | case SIG('Z', 'F'): | |
171 | len = sizeof(struct RR_ZF_s); | |
172 | break; | |
173 | default: | |
174 | len = 0; | |
175 | break; | |
176 | } | |
177 | len += offsetof(struct rock_ridge, u); | |
178 | if (len > rs->len) { | |
179 | printk(KERN_NOTICE "rock: directory entry would overflow " | |
180 | "storage\n"); | |
181 | printk(KERN_NOTICE "rock: sig=0x%02x, size=%d, remaining=%d\n", | |
182 | sig, len, rs->len); | |
183 | return -EIO; | |
184 | } | |
185 | return 0; | |
186 | } | |
187 | ||
7373909d AM |
188 | /* |
189 | * return length of name field; 0: not found, -1: to be ignored | |
190 | */ | |
1d372116 AM |
191 | int get_rock_ridge_filename(struct iso_directory_record *de, |
192 | char *retname, struct inode *inode) | |
1da177e4 | 193 | { |
ba40aaf0 | 194 | struct rock_state rs; |
7fa393a1 AM |
195 | struct rock_ridge *rr; |
196 | int sig; | |
197 | int retnamlen = 0; | |
198 | int truncate = 0; | |
ba40aaf0 | 199 | int ret = 0; |
1da177e4 | 200 | |
1d372116 AM |
201 | if (!ISOFS_SB(inode->i_sb)->s_rock) |
202 | return 0; | |
203 | *retname = 0; | |
204 | ||
ba40aaf0 AM |
205 | init_rock_state(&rs, inode); |
206 | setup_rock_ridge(de, inode, &rs); | |
7fa393a1 AM |
207 | repeat: |
208 | ||
ba40aaf0 AM |
209 | while (rs.len > 2) { /* There may be one byte for padding somewhere */ |
210 | rr = (struct rock_ridge *)rs.chr; | |
c0a1633b AG |
211 | /* |
212 | * Ignore rock ridge info if rr->len is out of range, but | |
213 | * don't return -EIO because that would make the file | |
214 | * invisible. | |
215 | */ | |
7fa393a1 AM |
216 | if (rr->len < 3) |
217 | goto out; /* Something got screwed up here */ | |
ba40aaf0 | 218 | sig = isonum_721(rs.chr); |
f2966632 AM |
219 | if (rock_check_overflow(&rs, sig)) |
220 | goto eio; | |
ba40aaf0 AM |
221 | rs.chr += rr->len; |
222 | rs.len -= rr->len; | |
c0a1633b AG |
223 | /* |
224 | * As above, just ignore the rock ridge info if rr->len | |
225 | * is bogus. | |
226 | */ | |
ba40aaf0 | 227 | if (rs.len < 0) |
c0a1633b | 228 | goto out; /* Something got screwed up here */ |
7fa393a1 AM |
229 | |
230 | switch (sig) { | |
231 | case SIG('R', 'R'): | |
232 | if ((rr->u.RR.flags[0] & RR_NM) == 0) | |
233 | goto out; | |
234 | break; | |
235 | case SIG('S', 'P'): | |
12121714 AM |
236 | if (check_sp(rr, inode)) |
237 | goto out; | |
7fa393a1 AM |
238 | break; |
239 | case SIG('C', 'E'): | |
ba40aaf0 AM |
240 | rs.cont_extent = isonum_733(rr->u.CE.extent); |
241 | rs.cont_offset = isonum_733(rr->u.CE.offset); | |
242 | rs.cont_size = isonum_733(rr->u.CE.size); | |
7fa393a1 AM |
243 | break; |
244 | case SIG('N', 'M'): | |
245 | if (truncate) | |
1d372116 | 246 | break; |
7fa393a1 | 247 | if (rr->len < 5) |
1d372116 | 248 | break; |
7fa393a1 AM |
249 | /* |
250 | * If the flags are 2 or 4, this indicates '.' or '..'. | |
251 | * We don't want to do anything with this, because it | |
252 | * screws up the code that calls us. We don't really | |
253 | * care anyways, since we can just use the non-RR | |
254 | * name. | |
255 | */ | |
256 | if (rr->u.NM.flags & 6) | |
1d372116 | 257 | break; |
1d372116 | 258 | |
7fa393a1 AM |
259 | if (rr->u.NM.flags & ~1) { |
260 | printk("Unsupported NM flag settings (%d)\n", | |
261 | rr->u.NM.flags); | |
1d372116 | 262 | break; |
7fa393a1 AM |
263 | } |
264 | if ((strlen(retname) + rr->len - 5) >= 254) { | |
265 | truncate = 1; | |
1d372116 AM |
266 | break; |
267 | } | |
7fa393a1 AM |
268 | strncat(retname, rr->u.NM.name, rr->len - 5); |
269 | retnamlen += rr->len - 5; | |
270 | break; | |
271 | case SIG('R', 'E'): | |
ba40aaf0 | 272 | kfree(rs.buffer); |
7fa393a1 AM |
273 | return -1; |
274 | default: | |
275 | break; | |
1d372116 | 276 | } |
1da177e4 | 277 | } |
ba40aaf0 AM |
278 | ret = rock_continue(&rs); |
279 | if (ret == 0) | |
280 | goto repeat; | |
281 | if (ret == 1) | |
282 | return retnamlen; /* If 0, this file did not have a NM field */ | |
7fa393a1 | 283 | out: |
ba40aaf0 AM |
284 | kfree(rs.buffer); |
285 | return ret; | |
f2966632 AM |
286 | eio: |
287 | ret = -EIO; | |
288 | goto out; | |
1da177e4 LT |
289 | } |
290 | ||
410dd3cf JK |
291 | #define RR_REGARD_XA 1 |
292 | #define RR_RELOC_DE 2 | |
293 | ||
1da177e4 LT |
294 | static int |
295 | parse_rock_ridge_inode_internal(struct iso_directory_record *de, | |
410dd3cf | 296 | struct inode *inode, int flags) |
1da177e4 | 297 | { |
1d372116 | 298 | int symlink_len = 0; |
7fa393a1 | 299 | int cnt, sig; |
410dd3cf | 300 | unsigned int reloc_block; |
7fa393a1 AM |
301 | struct inode *reloc; |
302 | struct rock_ridge *rr; | |
303 | int rootflag; | |
ba40aaf0 AM |
304 | struct rock_state rs; |
305 | int ret = 0; | |
1d372116 AM |
306 | |
307 | if (!ISOFS_SB(inode->i_sb)->s_rock) | |
308 | return 0; | |
309 | ||
ba40aaf0 AM |
310 | init_rock_state(&rs, inode); |
311 | setup_rock_ridge(de, inode, &rs); | |
410dd3cf | 312 | if (flags & RR_REGARD_XA) { |
ba40aaf0 AM |
313 | rs.chr += 14; |
314 | rs.len -= 14; | |
315 | if (rs.len < 0) | |
316 | rs.len = 0; | |
1d372116 AM |
317 | } |
318 | ||
7fa393a1 | 319 | repeat: |
ba40aaf0 AM |
320 | while (rs.len > 2) { /* There may be one byte for padding somewhere */ |
321 | rr = (struct rock_ridge *)rs.chr; | |
c0a1633b AG |
322 | /* |
323 | * Ignore rock ridge info if rr->len is out of range, but | |
324 | * don't return -EIO because that would make the file | |
325 | * invisible. | |
326 | */ | |
7fa393a1 AM |
327 | if (rr->len < 3) |
328 | goto out; /* Something got screwed up here */ | |
ba40aaf0 | 329 | sig = isonum_721(rs.chr); |
f2966632 AM |
330 | if (rock_check_overflow(&rs, sig)) |
331 | goto eio; | |
ba40aaf0 AM |
332 | rs.chr += rr->len; |
333 | rs.len -= rr->len; | |
c0a1633b AG |
334 | /* |
335 | * As above, just ignore the rock ridge info if rr->len | |
336 | * is bogus. | |
337 | */ | |
ba40aaf0 | 338 | if (rs.len < 0) |
c0a1633b | 339 | goto out; /* Something got screwed up here */ |
7fa393a1 AM |
340 | |
341 | switch (sig) { | |
1da177e4 | 342 | #ifndef CONFIG_ZISOFS /* No flag for SF or ZF */ |
7fa393a1 AM |
343 | case SIG('R', 'R'): |
344 | if ((rr->u.RR.flags[0] & | |
345 | (RR_PX | RR_TF | RR_SL | RR_CL)) == 0) | |
346 | goto out; | |
347 | break; | |
1da177e4 | 348 | #endif |
7fa393a1 | 349 | case SIG('S', 'P'): |
12121714 AM |
350 | if (check_sp(rr, inode)) |
351 | goto out; | |
7fa393a1 AM |
352 | break; |
353 | case SIG('C', 'E'): | |
ba40aaf0 AM |
354 | rs.cont_extent = isonum_733(rr->u.CE.extent); |
355 | rs.cont_offset = isonum_733(rr->u.CE.offset); | |
356 | rs.cont_size = isonum_733(rr->u.CE.size); | |
7fa393a1 AM |
357 | break; |
358 | case SIG('E', 'R'): | |
359 | ISOFS_SB(inode->i_sb)->s_rock = 1; | |
360 | printk(KERN_DEBUG "ISO 9660 Extensions: "); | |
361 | { | |
362 | int p; | |
363 | for (p = 0; p < rr->u.ER.len_id; p++) | |
364 | printk("%c", rr->u.ER.data[p]); | |
365 | } | |
366 | printk("\n"); | |
367 | break; | |
368 | case SIG('P', 'X'): | |
369 | inode->i_mode = isonum_733(rr->u.PX.mode); | |
bfe86848 | 370 | set_nlink(inode, isonum_733(rr->u.PX.n_links)); |
ba64e2b9 EB |
371 | i_uid_write(inode, isonum_733(rr->u.PX.uid)); |
372 | i_gid_write(inode, isonum_733(rr->u.PX.gid)); | |
7fa393a1 AM |
373 | break; |
374 | case SIG('P', 'N'): | |
375 | { | |
376 | int high, low; | |
377 | high = isonum_733(rr->u.PN.dev_high); | |
378 | low = isonum_733(rr->u.PN.dev_low); | |
379 | /* | |
380 | * The Rock Ridge standard specifies that if | |
381 | * sizeof(dev_t) <= 4, then the high field is | |
382 | * unused, and the device number is completely | |
383 | * stored in the low field. Some writers may | |
384 | * ignore this subtlety, | |
385 | * and as a result we test to see if the entire | |
386 | * device number is | |
387 | * stored in the low field, and use that. | |
388 | */ | |
389 | if ((low & ~0xff) && high == 0) { | |
390 | inode->i_rdev = | |
391 | MKDEV(low >> 8, low & 0xff); | |
392 | } else { | |
393 | inode->i_rdev = | |
394 | MKDEV(high, low); | |
1d372116 | 395 | } |
7fa393a1 AM |
396 | } |
397 | break; | |
398 | case SIG('T', 'F'): | |
399 | /* | |
400 | * Some RRIP writers incorrectly place ctime in the | |
401 | * TF_CREATE field. Try to handle this correctly for | |
402 | * either case. | |
403 | */ | |
404 | /* Rock ridge never appears on a High Sierra disk */ | |
405 | cnt = 0; | |
406 | if (rr->u.TF.flags & TF_CREATE) { | |
407 | inode->i_ctime.tv_sec = | |
408 | iso_date(rr->u.TF.times[cnt++].time, | |
409 | 0); | |
410 | inode->i_ctime.tv_nsec = 0; | |
411 | } | |
412 | if (rr->u.TF.flags & TF_MODIFY) { | |
413 | inode->i_mtime.tv_sec = | |
414 | iso_date(rr->u.TF.times[cnt++].time, | |
415 | 0); | |
416 | inode->i_mtime.tv_nsec = 0; | |
417 | } | |
418 | if (rr->u.TF.flags & TF_ACCESS) { | |
419 | inode->i_atime.tv_sec = | |
420 | iso_date(rr->u.TF.times[cnt++].time, | |
421 | 0); | |
422 | inode->i_atime.tv_nsec = 0; | |
423 | } | |
424 | if (rr->u.TF.flags & TF_ATTRIBUTES) { | |
425 | inode->i_ctime.tv_sec = | |
426 | iso_date(rr->u.TF.times[cnt++].time, | |
427 | 0); | |
428 | inode->i_ctime.tv_nsec = 0; | |
429 | } | |
430 | break; | |
431 | case SIG('S', 'L'): | |
432 | { | |
433 | int slen; | |
434 | struct SL_component *slp; | |
435 | struct SL_component *oldslp; | |
436 | slen = rr->len - 5; | |
437 | slp = &rr->u.SL.link; | |
438 | inode->i_size = symlink_len; | |
439 | while (slen > 1) { | |
440 | rootflag = 0; | |
441 | switch (slp->flags & ~1) { | |
442 | case 0: | |
443 | inode->i_size += | |
444 | slp->len; | |
445 | break; | |
446 | case 2: | |
447 | inode->i_size += 1; | |
448 | break; | |
449 | case 4: | |
450 | inode->i_size += 2; | |
451 | break; | |
452 | case 8: | |
453 | rootflag = 1; | |
454 | inode->i_size += 1; | |
455 | break; | |
456 | default: | |
457 | printk("Symlink component flag " | |
458 | "not implemented\n"); | |
1d372116 | 459 | } |
7fa393a1 AM |
460 | slen -= slp->len + 2; |
461 | oldslp = slp; | |
462 | slp = (struct SL_component *) | |
463 | (((char *)slp) + slp->len + 2); | |
464 | ||
465 | if (slen < 2) { | |
466 | if (((rr->u.SL. | |
467 | flags & 1) != 0) | |
468 | && | |
469 | ((oldslp-> | |
470 | flags & 1) == 0)) | |
1d372116 | 471 | inode->i_size += |
7fa393a1 AM |
472 | 1; |
473 | break; | |
1d372116 | 474 | } |
7fa393a1 AM |
475 | |
476 | /* | |
477 | * If this component record isn't | |
478 | * continued, then append a '/'. | |
479 | */ | |
480 | if (!rootflag | |
481 | && (oldslp->flags & 1) == 0) | |
482 | inode->i_size += 1; | |
1d372116 | 483 | } |
7fa393a1 AM |
484 | } |
485 | symlink_len = inode->i_size; | |
486 | break; | |
487 | case SIG('R', 'E'): | |
488 | printk(KERN_WARNING "Attempt to read inode for " | |
489 | "relocated directory\n"); | |
490 | goto out; | |
491 | case SIG('C', 'L'): | |
410dd3cf JK |
492 | if (flags & RR_RELOC_DE) { |
493 | printk(KERN_ERR | |
494 | "ISOFS: Recursive directory relocation " | |
495 | "is not supported\n"); | |
496 | goto eio; | |
497 | } | |
498 | reloc_block = isonum_733(rr->u.CL.location); | |
499 | if (reloc_block == ISOFS_I(inode)->i_iget5_block && | |
500 | ISOFS_I(inode)->i_iget5_offset == 0) { | |
501 | printk(KERN_ERR | |
502 | "ISOFS: Directory relocation points to " | |
503 | "itself\n"); | |
504 | goto eio; | |
505 | } | |
506 | ISOFS_I(inode)->i_first_extent = reloc_block; | |
507 | reloc = isofs_iget_reloc(inode->i_sb, reloc_block, 0); | |
c4386c83 DH |
508 | if (IS_ERR(reloc)) { |
509 | ret = PTR_ERR(reloc); | |
1d372116 | 510 | goto out; |
c4386c83 | 511 | } |
7fa393a1 | 512 | inode->i_mode = reloc->i_mode; |
bfe86848 | 513 | set_nlink(inode, reloc->i_nlink); |
7fa393a1 AM |
514 | inode->i_uid = reloc->i_uid; |
515 | inode->i_gid = reloc->i_gid; | |
516 | inode->i_rdev = reloc->i_rdev; | |
517 | inode->i_size = reloc->i_size; | |
518 | inode->i_blocks = reloc->i_blocks; | |
519 | inode->i_atime = reloc->i_atime; | |
520 | inode->i_ctime = reloc->i_ctime; | |
521 | inode->i_mtime = reloc->i_mtime; | |
522 | iput(reloc); | |
523 | break; | |
1da177e4 | 524 | #ifdef CONFIG_ZISOFS |
7fa393a1 AM |
525 | case SIG('Z', 'F'): { |
526 | int algo; | |
527 | ||
528 | if (ISOFS_SB(inode->i_sb)->s_nocompress) | |
1d372116 | 529 | break; |
7fa393a1 AM |
530 | algo = isonum_721(rr->u.ZF.algorithm); |
531 | if (algo == SIG('p', 'z')) { | |
532 | int block_shift = | |
533 | isonum_711(&rr->u.ZF.parms[1]); | |
59bc0552 | 534 | if (block_shift > 17) { |
7fa393a1 AM |
535 | printk(KERN_WARNING "isofs: " |
536 | "Can't handle ZF block " | |
537 | "size of 2^%d\n", | |
538 | block_shift); | |
539 | } else { | |
540 | /* | |
541 | * Note: we don't change | |
542 | * i_blocks here | |
543 | */ | |
544 | ISOFS_I(inode)->i_file_format = | |
545 | isofs_file_compressed; | |
546 | /* | |
547 | * Parameters to compression | |
548 | * algorithm (header size, | |
549 | * block size) | |
550 | */ | |
551 | ISOFS_I(inode)->i_format_parm[0] = | |
552 | isonum_711(&rr->u.ZF.parms[0]); | |
553 | ISOFS_I(inode)->i_format_parm[1] = | |
554 | isonum_711(&rr->u.ZF.parms[1]); | |
555 | inode->i_size = | |
556 | isonum_733(rr->u.ZF. | |
557 | real_size); | |
558 | } | |
559 | } else { | |
560 | printk(KERN_WARNING | |
561 | "isofs: Unknown ZF compression " | |
562 | "algorithm: %c%c\n", | |
563 | rr->u.ZF.algorithm[0], | |
564 | rr->u.ZF.algorithm[1]); | |
1d372116 | 565 | } |
7fa393a1 AM |
566 | break; |
567 | } | |
568 | #endif | |
569 | default: | |
570 | break; | |
1d372116 AM |
571 | } |
572 | } | |
ba40aaf0 AM |
573 | ret = rock_continue(&rs); |
574 | if (ret == 0) | |
575 | goto repeat; | |
576 | if (ret == 1) | |
577 | ret = 0; | |
7fa393a1 | 578 | out: |
ba40aaf0 AM |
579 | kfree(rs.buffer); |
580 | return ret; | |
f2966632 AM |
581 | eio: |
582 | ret = -EIO; | |
583 | goto out; | |
1da177e4 LT |
584 | } |
585 | ||
586 | static char *get_symlink_chunk(char *rpnt, struct rock_ridge *rr, char *plimit) | |
587 | { | |
588 | int slen; | |
589 | int rootflag; | |
590 | struct SL_component *oldslp; | |
591 | struct SL_component *slp; | |
592 | slen = rr->len - 5; | |
593 | slp = &rr->u.SL.link; | |
594 | while (slen > 1) { | |
595 | rootflag = 0; | |
596 | switch (slp->flags & ~1) { | |
597 | case 0: | |
598 | if (slp->len > plimit - rpnt) | |
599 | return NULL; | |
600 | memcpy(rpnt, slp->text, slp->len); | |
1d372116 | 601 | rpnt += slp->len; |
1da177e4 LT |
602 | break; |
603 | case 2: | |
604 | if (rpnt >= plimit) | |
605 | return NULL; | |
1d372116 | 606 | *rpnt++ = '.'; |
1da177e4 LT |
607 | break; |
608 | case 4: | |
609 | if (2 > plimit - rpnt) | |
610 | return NULL; | |
1d372116 AM |
611 | *rpnt++ = '.'; |
612 | *rpnt++ = '.'; | |
1da177e4 LT |
613 | break; |
614 | case 8: | |
615 | if (rpnt >= plimit) | |
616 | return NULL; | |
617 | rootflag = 1; | |
1d372116 | 618 | *rpnt++ = '/'; |
1da177e4 LT |
619 | break; |
620 | default: | |
621 | printk("Symlink component flag not implemented (%d)\n", | |
1d372116 | 622 | slp->flags); |
1da177e4 LT |
623 | } |
624 | slen -= slp->len + 2; | |
625 | oldslp = slp; | |
1d372116 | 626 | slp = (struct SL_component *)((char *)slp + slp->len + 2); |
1da177e4 LT |
627 | |
628 | if (slen < 2) { | |
629 | /* | |
630 | * If there is another SL record, and this component | |
631 | * record isn't continued, then add a slash. | |
632 | */ | |
633 | if ((!rootflag) && (rr->u.SL.flags & 1) && | |
634 | !(oldslp->flags & 1)) { | |
635 | if (rpnt >= plimit) | |
636 | return NULL; | |
1d372116 | 637 | *rpnt++ = '/'; |
1da177e4 LT |
638 | } |
639 | break; | |
640 | } | |
641 | ||
642 | /* | |
643 | * If this component record isn't continued, then append a '/'. | |
644 | */ | |
645 | if (!rootflag && !(oldslp->flags & 1)) { | |
646 | if (rpnt >= plimit) | |
647 | return NULL; | |
1d372116 | 648 | *rpnt++ = '/'; |
1da177e4 LT |
649 | } |
650 | } | |
651 | return rpnt; | |
652 | } | |
653 | ||
410dd3cf JK |
654 | int parse_rock_ridge_inode(struct iso_directory_record *de, struct inode *inode, |
655 | int relocated) | |
1da177e4 | 656 | { |
410dd3cf JK |
657 | int flags = relocated ? RR_RELOC_DE : 0; |
658 | int result = parse_rock_ridge_inode_internal(de, inode, flags); | |
7373909d AM |
659 | |
660 | /* | |
661 | * if rockridge flag was reset and we didn't look for attributes | |
662 | * behind eventual XA attributes, have a look there | |
663 | */ | |
1d372116 AM |
664 | if ((ISOFS_SB(inode->i_sb)->s_rock_offset == -1) |
665 | && (ISOFS_SB(inode->i_sb)->s_rock == 2)) { | |
410dd3cf JK |
666 | result = parse_rock_ridge_inode_internal(de, inode, |
667 | flags | RR_REGARD_XA); | |
1d372116 AM |
668 | } |
669 | return result; | |
1da177e4 LT |
670 | } |
671 | ||
7373909d AM |
672 | /* |
673 | * readpage() for symlinks: reads symlink contents into the page and either | |
674 | * makes it uptodate and returns 0 or returns error (-EIO) | |
675 | */ | |
1da177e4 LT |
676 | static int rock_ridge_symlink_readpage(struct file *file, struct page *page) |
677 | { | |
678 | struct inode *inode = page->mapping->host; | |
1d372116 | 679 | struct iso_inode_info *ei = ISOFS_I(inode); |
4f819a78 | 680 | struct isofs_sb_info *sbi = ISOFS_SB(inode->i_sb); |
1da177e4 LT |
681 | char *link = kmap(page); |
682 | unsigned long bufsize = ISOFS_BUFFER_SIZE(inode); | |
683 | struct buffer_head *bh; | |
684 | char *rpnt = link; | |
685 | unsigned char *pnt; | |
76ab07eb | 686 | struct iso_directory_record *raw_de; |
1da177e4 LT |
687 | unsigned long block, offset; |
688 | int sig; | |
1da177e4 | 689 | struct rock_ridge *rr; |
ba40aaf0 AM |
690 | struct rock_state rs; |
691 | int ret; | |
1da177e4 | 692 | |
4f819a78 | 693 | if (!sbi->s_rock) |
1da177e4 LT |
694 | goto error; |
695 | ||
ba40aaf0 | 696 | init_rock_state(&rs, inode); |
1da177e4 | 697 | block = ei->i_iget5_block; |
1da177e4 LT |
698 | bh = sb_bread(inode->i_sb, block); |
699 | if (!bh) | |
700 | goto out_noread; | |
701 | ||
1d372116 AM |
702 | offset = ei->i_iget5_offset; |
703 | pnt = (unsigned char *)bh->b_data + offset; | |
1da177e4 | 704 | |
76ab07eb | 705 | raw_de = (struct iso_directory_record *)pnt; |
1da177e4 LT |
706 | |
707 | /* | |
708 | * If we go past the end of the buffer, there is some sort of error. | |
709 | */ | |
710 | if (offset + *pnt > bufsize) | |
711 | goto out_bad_span; | |
712 | ||
7373909d AM |
713 | /* |
714 | * Now test for possible Rock Ridge extensions which will override | |
715 | * some of these numbers in the inode structure. | |
716 | */ | |
1da177e4 | 717 | |
ba40aaf0 | 718 | setup_rock_ridge(raw_de, inode, &rs); |
1da177e4 | 719 | |
7fa393a1 | 720 | repeat: |
ba40aaf0 AM |
721 | while (rs.len > 2) { /* There may be one byte for padding somewhere */ |
722 | rr = (struct rock_ridge *)rs.chr; | |
1da177e4 LT |
723 | if (rr->len < 3) |
724 | goto out; /* Something got screwed up here */ | |
ba40aaf0 | 725 | sig = isonum_721(rs.chr); |
f2966632 AM |
726 | if (rock_check_overflow(&rs, sig)) |
727 | goto out; | |
ba40aaf0 AM |
728 | rs.chr += rr->len; |
729 | rs.len -= rr->len; | |
730 | if (rs.len < 0) | |
1da177e4 LT |
731 | goto out; /* corrupted isofs */ |
732 | ||
733 | switch (sig) { | |
734 | case SIG('R', 'R'): | |
735 | if ((rr->u.RR.flags[0] & RR_SL) == 0) | |
736 | goto out; | |
737 | break; | |
738 | case SIG('S', 'P'): | |
12121714 AM |
739 | if (check_sp(rr, inode)) |
740 | goto out; | |
1da177e4 LT |
741 | break; |
742 | case SIG('S', 'L'): | |
743 | rpnt = get_symlink_chunk(rpnt, rr, | |
744 | link + (PAGE_SIZE - 1)); | |
745 | if (rpnt == NULL) | |
746 | goto out; | |
747 | break; | |
748 | case SIG('C', 'E'): | |
749 | /* This tells is if there is a continuation record */ | |
ba40aaf0 AM |
750 | rs.cont_extent = isonum_733(rr->u.CE.extent); |
751 | rs.cont_offset = isonum_733(rr->u.CE.offset); | |
752 | rs.cont_size = isonum_733(rr->u.CE.size); | |
1da177e4 LT |
753 | default: |
754 | break; | |
755 | } | |
756 | } | |
ba40aaf0 AM |
757 | ret = rock_continue(&rs); |
758 | if (ret == 0) | |
759 | goto repeat; | |
760 | if (ret < 0) | |
761 | goto fail; | |
1da177e4 LT |
762 | |
763 | if (rpnt == link) | |
764 | goto fail; | |
765 | brelse(bh); | |
766 | *rpnt = '\0'; | |
1da177e4 LT |
767 | SetPageUptodate(page); |
768 | kunmap(page); | |
769 | unlock_page(page); | |
770 | return 0; | |
771 | ||
772 | /* error exit from macro */ | |
7fa393a1 | 773 | out: |
ba40aaf0 | 774 | kfree(rs.buffer); |
1da177e4 | 775 | goto fail; |
7fa393a1 | 776 | out_noread: |
1da177e4 LT |
777 | printk("unable to read i-node block"); |
778 | goto fail; | |
7fa393a1 | 779 | out_bad_span: |
1da177e4 | 780 | printk("symlink spans iso9660 blocks\n"); |
7fa393a1 | 781 | fail: |
1da177e4 | 782 | brelse(bh); |
7fa393a1 | 783 | error: |
1da177e4 LT |
784 | SetPageError(page); |
785 | kunmap(page); | |
786 | unlock_page(page); | |
787 | return -EIO; | |
788 | } | |
789 | ||
f5e54d6e | 790 | const struct address_space_operations isofs_symlink_aops = { |
1d372116 | 791 | .readpage = rock_ridge_symlink_readpage |
1da177e4 | 792 | }; |