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