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[GitHub/LineageOS/android_kernel_motorola_exynos9610.git] / fs / isofs / rock.c
1 // SPDX-License-Identifier: GPL-2.0
2 /*
3 * linux/fs/isofs/rock.c
4 *
5 * (C) 1992, 1993 Eric Youngdale
6 *
7 * Rock Ridge Extensions to iso9660
8 */
9
10 #include <linux/slab.h>
11 #include <linux/pagemap.h>
12
13 #include "isofs.h"
14 #include "rock.h"
15
16 /*
17 * These functions are designed to read the system areas of a directory record
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
22 * for the file.
23 */
24
25 #define SIG(A,B) ((A) | ((B) << 8)) /* isonum_721() */
26
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 int cont_loops;
35 struct inode *inode;
36 };
37
38 /*
39 * This is a way of ensuring that we have something in the system
40 * use fields that is compatible with Rock Ridge. Return zero on success.
41 */
42
43 static int check_sp(struct rock_ridge *rr, struct inode *inode)
44 {
45 if (rr->u.SP.magic[0] != 0xbe)
46 return -1;
47 if (rr->u.SP.magic[1] != 0xef)
48 return -1;
49 ISOFS_SB(inode->i_sb)->s_rock_offset = rr->u.SP.skip;
50 return 0;
51 }
52
53 static void setup_rock_ridge(struct iso_directory_record *de,
54 struct inode *inode, struct rock_state *rs)
55 {
56 rs->len = sizeof(struct iso_directory_record) + de->name_len[0];
57 if (rs->len & 1)
58 (rs->len)++;
59 rs->chr = (unsigned char *)de + rs->len;
60 rs->len = *((unsigned char *)de) - rs->len;
61 if (rs->len < 0)
62 rs->len = 0;
63
64 if (ISOFS_SB(inode->i_sb)->s_rock_offset != -1) {
65 rs->len -= ISOFS_SB(inode->i_sb)->s_rock_offset;
66 rs->chr += ISOFS_SB(inode->i_sb)->s_rock_offset;
67 if (rs->len < 0)
68 rs->len = 0;
69 }
70 }
71
72 static void init_rock_state(struct rock_state *rs, struct inode *inode)
73 {
74 memset(rs, 0, sizeof(*rs));
75 rs->inode = inode;
76 }
77
78 /* Maximum number of Rock Ridge continuation entries */
79 #define RR_MAX_CE_ENTRIES 32
80
81 /*
82 * Returns 0 if the caller should continue scanning, 1 if the scan must end
83 * and -ve on error.
84 */
85 static int rock_continue(struct rock_state *rs)
86 {
87 int ret = 1;
88 int blocksize = 1 << rs->inode->i_blkbits;
89 const int min_de_size = offsetof(struct rock_ridge, u);
90
91 kfree(rs->buffer);
92 rs->buffer = NULL;
93
94 if ((unsigned)rs->cont_offset > blocksize - min_de_size ||
95 (unsigned)rs->cont_size > blocksize ||
96 (unsigned)(rs->cont_offset + rs->cont_size) > blocksize) {
97 printk(KERN_NOTICE "rock: corrupted directory entry. "
98 "extent=%d, offset=%d, size=%d\n",
99 rs->cont_extent, rs->cont_offset, rs->cont_size);
100 ret = -EIO;
101 goto out;
102 }
103
104 if (rs->cont_extent) {
105 struct buffer_head *bh;
106
107 rs->buffer = kmalloc(rs->cont_size, GFP_KERNEL);
108 if (!rs->buffer) {
109 ret = -ENOMEM;
110 goto out;
111 }
112 ret = -EIO;
113 if (++rs->cont_loops >= RR_MAX_CE_ENTRIES)
114 goto out;
115 bh = sb_bread(rs->inode->i_sb, rs->cont_extent);
116 if (bh) {
117 memcpy(rs->buffer, bh->b_data + rs->cont_offset,
118 rs->cont_size);
119 put_bh(bh);
120 rs->chr = rs->buffer;
121 rs->len = rs->cont_size;
122 rs->cont_extent = 0;
123 rs->cont_size = 0;
124 rs->cont_offset = 0;
125 return 0;
126 }
127 printk("Unable to read rock-ridge attributes\n");
128 }
129 out:
130 kfree(rs->buffer);
131 rs->buffer = NULL;
132 return ret;
133 }
134
135 /*
136 * We think there's a record of type `sig' at rs->chr. Parse the signature
137 * and make sure that there's really room for a record of that type.
138 */
139 static int rock_check_overflow(struct rock_state *rs, int sig)
140 {
141 int len;
142
143 switch (sig) {
144 case SIG('S', 'P'):
145 len = sizeof(struct SU_SP_s);
146 break;
147 case SIG('C', 'E'):
148 len = sizeof(struct SU_CE_s);
149 break;
150 case SIG('E', 'R'):
151 len = sizeof(struct SU_ER_s);
152 break;
153 case SIG('R', 'R'):
154 len = sizeof(struct RR_RR_s);
155 break;
156 case SIG('P', 'X'):
157 len = sizeof(struct RR_PX_s);
158 break;
159 case SIG('P', 'N'):
160 len = sizeof(struct RR_PN_s);
161 break;
162 case SIG('S', 'L'):
163 len = sizeof(struct RR_SL_s);
164 break;
165 case SIG('N', 'M'):
166 len = sizeof(struct RR_NM_s);
167 break;
168 case SIG('C', 'L'):
169 len = sizeof(struct RR_CL_s);
170 break;
171 case SIG('P', 'L'):
172 len = sizeof(struct RR_PL_s);
173 break;
174 case SIG('T', 'F'):
175 len = sizeof(struct RR_TF_s);
176 break;
177 case SIG('Z', 'F'):
178 len = sizeof(struct RR_ZF_s);
179 break;
180 default:
181 len = 0;
182 break;
183 }
184 len += offsetof(struct rock_ridge, u);
185 if (len > rs->len) {
186 printk(KERN_NOTICE "rock: directory entry would overflow "
187 "storage\n");
188 printk(KERN_NOTICE "rock: sig=0x%02x, size=%d, remaining=%d\n",
189 sig, len, rs->len);
190 return -EIO;
191 }
192 return 0;
193 }
194
195 /*
196 * return length of name field; 0: not found, -1: to be ignored
197 */
198 int get_rock_ridge_filename(struct iso_directory_record *de,
199 char *retname, struct inode *inode)
200 {
201 struct rock_state rs;
202 struct rock_ridge *rr;
203 int sig;
204 int retnamlen = 0;
205 int truncate = 0;
206 int ret = 0;
207 char *p;
208 int len;
209
210 if (!ISOFS_SB(inode->i_sb)->s_rock)
211 return 0;
212 *retname = 0;
213
214 init_rock_state(&rs, inode);
215 setup_rock_ridge(de, inode, &rs);
216 repeat:
217
218 while (rs.len > 2) { /* There may be one byte for padding somewhere */
219 rr = (struct rock_ridge *)rs.chr;
220 /*
221 * Ignore rock ridge info if rr->len is out of range, but
222 * don't return -EIO because that would make the file
223 * invisible.
224 */
225 if (rr->len < 3)
226 goto out; /* Something got screwed up here */
227 sig = isonum_721(rs.chr);
228 if (rock_check_overflow(&rs, sig))
229 goto eio;
230 rs.chr += rr->len;
231 rs.len -= rr->len;
232 /*
233 * As above, just ignore the rock ridge info if rr->len
234 * is bogus.
235 */
236 if (rs.len < 0)
237 goto out; /* Something got screwed up here */
238
239 switch (sig) {
240 case SIG('R', 'R'):
241 if ((rr->u.RR.flags[0] & RR_NM) == 0)
242 goto out;
243 break;
244 case SIG('S', 'P'):
245 if (check_sp(rr, inode))
246 goto out;
247 break;
248 case SIG('C', 'E'):
249 rs.cont_extent = isonum_733(rr->u.CE.extent);
250 rs.cont_offset = isonum_733(rr->u.CE.offset);
251 rs.cont_size = isonum_733(rr->u.CE.size);
252 break;
253 case SIG('N', 'M'):
254 if (truncate)
255 break;
256 if (rr->len < 5)
257 break;
258 /*
259 * If the flags are 2 or 4, this indicates '.' or '..'.
260 * We don't want to do anything with this, because it
261 * screws up the code that calls us. We don't really
262 * care anyways, since we can just use the non-RR
263 * name.
264 */
265 if (rr->u.NM.flags & 6)
266 break;
267
268 if (rr->u.NM.flags & ~1) {
269 printk("Unsupported NM flag settings (%d)\n",
270 rr->u.NM.flags);
271 break;
272 }
273 len = rr->len - 5;
274 if (retnamlen + len >= 254) {
275 truncate = 1;
276 break;
277 }
278 p = memchr(rr->u.NM.name, '\0', len);
279 if (unlikely(p))
280 len = p - rr->u.NM.name;
281 memcpy(retname + retnamlen, rr->u.NM.name, len);
282 retnamlen += len;
283 retname[retnamlen] = '\0';
284 break;
285 case SIG('R', 'E'):
286 kfree(rs.buffer);
287 return -1;
288 default:
289 break;
290 }
291 }
292 ret = rock_continue(&rs);
293 if (ret == 0)
294 goto repeat;
295 if (ret == 1)
296 return retnamlen; /* If 0, this file did not have a NM field */
297 out:
298 kfree(rs.buffer);
299 return ret;
300 eio:
301 ret = -EIO;
302 goto out;
303 }
304
305 #define RR_REGARD_XA 1
306 #define RR_RELOC_DE 2
307
308 static int
309 parse_rock_ridge_inode_internal(struct iso_directory_record *de,
310 struct inode *inode, int flags)
311 {
312 int symlink_len = 0;
313 int cnt, sig;
314 unsigned int reloc_block;
315 struct inode *reloc;
316 struct rock_ridge *rr;
317 int rootflag;
318 struct rock_state rs;
319 int ret = 0;
320
321 if (!ISOFS_SB(inode->i_sb)->s_rock)
322 return 0;
323
324 init_rock_state(&rs, inode);
325 setup_rock_ridge(de, inode, &rs);
326 if (flags & RR_REGARD_XA) {
327 rs.chr += 14;
328 rs.len -= 14;
329 if (rs.len < 0)
330 rs.len = 0;
331 }
332
333 repeat:
334 while (rs.len > 2) { /* There may be one byte for padding somewhere */
335 rr = (struct rock_ridge *)rs.chr;
336 /*
337 * Ignore rock ridge info if rr->len is out of range, but
338 * don't return -EIO because that would make the file
339 * invisible.
340 */
341 if (rr->len < 3)
342 goto out; /* Something got screwed up here */
343 sig = isonum_721(rs.chr);
344 if (rock_check_overflow(&rs, sig))
345 goto eio;
346 rs.chr += rr->len;
347 rs.len -= rr->len;
348 /*
349 * As above, just ignore the rock ridge info if rr->len
350 * is bogus.
351 */
352 if (rs.len < 0)
353 goto out; /* Something got screwed up here */
354
355 switch (sig) {
356 #ifndef CONFIG_ZISOFS /* No flag for SF or ZF */
357 case SIG('R', 'R'):
358 if ((rr->u.RR.flags[0] &
359 (RR_PX | RR_TF | RR_SL | RR_CL)) == 0)
360 goto out;
361 break;
362 #endif
363 case SIG('S', 'P'):
364 if (check_sp(rr, inode))
365 goto out;
366 break;
367 case SIG('C', 'E'):
368 rs.cont_extent = isonum_733(rr->u.CE.extent);
369 rs.cont_offset = isonum_733(rr->u.CE.offset);
370 rs.cont_size = isonum_733(rr->u.CE.size);
371 break;
372 case SIG('E', 'R'):
373 /* Invalid length of ER tag id? */
374 if (rr->u.ER.len_id + offsetof(struct rock_ridge, u.ER.data) > rr->len)
375 goto out;
376 ISOFS_SB(inode->i_sb)->s_rock = 1;
377 printk(KERN_DEBUG "ISO 9660 Extensions: ");
378 {
379 int p;
380 for (p = 0; p < rr->u.ER.len_id; p++)
381 printk(KERN_CONT "%c", rr->u.ER.data[p]);
382 }
383 printk(KERN_CONT "\n");
384 break;
385 case SIG('P', 'X'):
386 inode->i_mode = isonum_733(rr->u.PX.mode);
387 set_nlink(inode, isonum_733(rr->u.PX.n_links));
388 i_uid_write(inode, isonum_733(rr->u.PX.uid));
389 i_gid_write(inode, isonum_733(rr->u.PX.gid));
390 break;
391 case SIG('P', 'N'):
392 {
393 int high, low;
394 high = isonum_733(rr->u.PN.dev_high);
395 low = isonum_733(rr->u.PN.dev_low);
396 /*
397 * The Rock Ridge standard specifies that if
398 * sizeof(dev_t) <= 4, then the high field is
399 * unused, and the device number is completely
400 * stored in the low field. Some writers may
401 * ignore this subtlety,
402 * and as a result we test to see if the entire
403 * device number is
404 * stored in the low field, and use that.
405 */
406 if ((low & ~0xff) && high == 0) {
407 inode->i_rdev =
408 MKDEV(low >> 8, low & 0xff);
409 } else {
410 inode->i_rdev =
411 MKDEV(high, low);
412 }
413 }
414 break;
415 case SIG('T', 'F'):
416 /*
417 * Some RRIP writers incorrectly place ctime in the
418 * TF_CREATE field. Try to handle this correctly for
419 * either case.
420 */
421 /* Rock ridge never appears on a High Sierra disk */
422 cnt = 0;
423 if (rr->u.TF.flags & TF_CREATE) {
424 inode->i_ctime.tv_sec =
425 iso_date(rr->u.TF.times[cnt++].time,
426 0);
427 inode->i_ctime.tv_nsec = 0;
428 }
429 if (rr->u.TF.flags & TF_MODIFY) {
430 inode->i_mtime.tv_sec =
431 iso_date(rr->u.TF.times[cnt++].time,
432 0);
433 inode->i_mtime.tv_nsec = 0;
434 }
435 if (rr->u.TF.flags & TF_ACCESS) {
436 inode->i_atime.tv_sec =
437 iso_date(rr->u.TF.times[cnt++].time,
438 0);
439 inode->i_atime.tv_nsec = 0;
440 }
441 if (rr->u.TF.flags & TF_ATTRIBUTES) {
442 inode->i_ctime.tv_sec =
443 iso_date(rr->u.TF.times[cnt++].time,
444 0);
445 inode->i_ctime.tv_nsec = 0;
446 }
447 break;
448 case SIG('S', 'L'):
449 {
450 int slen;
451 struct SL_component *slp;
452 struct SL_component *oldslp;
453 slen = rr->len - 5;
454 slp = &rr->u.SL.link;
455 inode->i_size = symlink_len;
456 while (slen > 1) {
457 rootflag = 0;
458 switch (slp->flags & ~1) {
459 case 0:
460 inode->i_size +=
461 slp->len;
462 break;
463 case 2:
464 inode->i_size += 1;
465 break;
466 case 4:
467 inode->i_size += 2;
468 break;
469 case 8:
470 rootflag = 1;
471 inode->i_size += 1;
472 break;
473 default:
474 printk("Symlink component flag "
475 "not implemented\n");
476 }
477 slen -= slp->len + 2;
478 oldslp = slp;
479 slp = (struct SL_component *)
480 (((char *)slp) + slp->len + 2);
481
482 if (slen < 2) {
483 if (((rr->u.SL.
484 flags & 1) != 0)
485 &&
486 ((oldslp->
487 flags & 1) == 0))
488 inode->i_size +=
489 1;
490 break;
491 }
492
493 /*
494 * If this component record isn't
495 * continued, then append a '/'.
496 */
497 if (!rootflag
498 && (oldslp->flags & 1) == 0)
499 inode->i_size += 1;
500 }
501 }
502 symlink_len = inode->i_size;
503 break;
504 case SIG('R', 'E'):
505 printk(KERN_WARNING "Attempt to read inode for "
506 "relocated directory\n");
507 goto out;
508 case SIG('C', 'L'):
509 if (flags & RR_RELOC_DE) {
510 printk(KERN_ERR
511 "ISOFS: Recursive directory relocation "
512 "is not supported\n");
513 goto eio;
514 }
515 reloc_block = isonum_733(rr->u.CL.location);
516 if (reloc_block == ISOFS_I(inode)->i_iget5_block &&
517 ISOFS_I(inode)->i_iget5_offset == 0) {
518 printk(KERN_ERR
519 "ISOFS: Directory relocation points to "
520 "itself\n");
521 goto eio;
522 }
523 ISOFS_I(inode)->i_first_extent = reloc_block;
524 reloc = isofs_iget_reloc(inode->i_sb, reloc_block, 0);
525 if (IS_ERR(reloc)) {
526 ret = PTR_ERR(reloc);
527 goto out;
528 }
529 inode->i_mode = reloc->i_mode;
530 set_nlink(inode, reloc->i_nlink);
531 inode->i_uid = reloc->i_uid;
532 inode->i_gid = reloc->i_gid;
533 inode->i_rdev = reloc->i_rdev;
534 inode->i_size = reloc->i_size;
535 inode->i_blocks = reloc->i_blocks;
536 inode->i_atime = reloc->i_atime;
537 inode->i_ctime = reloc->i_ctime;
538 inode->i_mtime = reloc->i_mtime;
539 iput(reloc);
540 break;
541 #ifdef CONFIG_ZISOFS
542 case SIG('Z', 'F'): {
543 int algo;
544
545 if (ISOFS_SB(inode->i_sb)->s_nocompress)
546 break;
547 algo = isonum_721(rr->u.ZF.algorithm);
548 if (algo == SIG('p', 'z')) {
549 int block_shift =
550 isonum_711(&rr->u.ZF.parms[1]);
551 if (block_shift > 17) {
552 printk(KERN_WARNING "isofs: "
553 "Can't handle ZF block "
554 "size of 2^%d\n",
555 block_shift);
556 } else {
557 /*
558 * Note: we don't change
559 * i_blocks here
560 */
561 ISOFS_I(inode)->i_file_format =
562 isofs_file_compressed;
563 /*
564 * Parameters to compression
565 * algorithm (header size,
566 * block size)
567 */
568 ISOFS_I(inode)->i_format_parm[0] =
569 isonum_711(&rr->u.ZF.parms[0]);
570 ISOFS_I(inode)->i_format_parm[1] =
571 isonum_711(&rr->u.ZF.parms[1]);
572 inode->i_size =
573 isonum_733(rr->u.ZF.
574 real_size);
575 }
576 } else {
577 printk(KERN_WARNING
578 "isofs: Unknown ZF compression "
579 "algorithm: %c%c\n",
580 rr->u.ZF.algorithm[0],
581 rr->u.ZF.algorithm[1]);
582 }
583 break;
584 }
585 #endif
586 default:
587 break;
588 }
589 }
590 ret = rock_continue(&rs);
591 if (ret == 0)
592 goto repeat;
593 if (ret == 1)
594 ret = 0;
595 out:
596 kfree(rs.buffer);
597 return ret;
598 eio:
599 ret = -EIO;
600 goto out;
601 }
602
603 static char *get_symlink_chunk(char *rpnt, struct rock_ridge *rr, char *plimit)
604 {
605 int slen;
606 int rootflag;
607 struct SL_component *oldslp;
608 struct SL_component *slp;
609 slen = rr->len - 5;
610 slp = &rr->u.SL.link;
611 while (slen > 1) {
612 rootflag = 0;
613 switch (slp->flags & ~1) {
614 case 0:
615 if (slp->len > plimit - rpnt)
616 return NULL;
617 memcpy(rpnt, slp->text, slp->len);
618 rpnt += slp->len;
619 break;
620 case 2:
621 if (rpnt >= plimit)
622 return NULL;
623 *rpnt++ = '.';
624 break;
625 case 4:
626 if (2 > plimit - rpnt)
627 return NULL;
628 *rpnt++ = '.';
629 *rpnt++ = '.';
630 break;
631 case 8:
632 if (rpnt >= plimit)
633 return NULL;
634 rootflag = 1;
635 *rpnt++ = '/';
636 break;
637 default:
638 printk("Symlink component flag not implemented (%d)\n",
639 slp->flags);
640 }
641 slen -= slp->len + 2;
642 oldslp = slp;
643 slp = (struct SL_component *)((char *)slp + slp->len + 2);
644
645 if (slen < 2) {
646 /*
647 * If there is another SL record, and this component
648 * record isn't continued, then add a slash.
649 */
650 if ((!rootflag) && (rr->u.SL.flags & 1) &&
651 !(oldslp->flags & 1)) {
652 if (rpnt >= plimit)
653 return NULL;
654 *rpnt++ = '/';
655 }
656 break;
657 }
658
659 /*
660 * If this component record isn't continued, then append a '/'.
661 */
662 if (!rootflag && !(oldslp->flags & 1)) {
663 if (rpnt >= plimit)
664 return NULL;
665 *rpnt++ = '/';
666 }
667 }
668 return rpnt;
669 }
670
671 int parse_rock_ridge_inode(struct iso_directory_record *de, struct inode *inode,
672 int relocated)
673 {
674 int flags = relocated ? RR_RELOC_DE : 0;
675 int result = parse_rock_ridge_inode_internal(de, inode, flags);
676
677 /*
678 * if rockridge flag was reset and we didn't look for attributes
679 * behind eventual XA attributes, have a look there
680 */
681 if ((ISOFS_SB(inode->i_sb)->s_rock_offset == -1)
682 && (ISOFS_SB(inode->i_sb)->s_rock == 2)) {
683 result = parse_rock_ridge_inode_internal(de, inode,
684 flags | RR_REGARD_XA);
685 }
686 return result;
687 }
688
689 /*
690 * readpage() for symlinks: reads symlink contents into the page and either
691 * makes it uptodate and returns 0 or returns error (-EIO)
692 */
693 static int rock_ridge_symlink_readpage(struct file *file, struct page *page)
694 {
695 struct inode *inode = page->mapping->host;
696 struct iso_inode_info *ei = ISOFS_I(inode);
697 struct isofs_sb_info *sbi = ISOFS_SB(inode->i_sb);
698 char *link = page_address(page);
699 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
700 struct buffer_head *bh;
701 char *rpnt = link;
702 unsigned char *pnt;
703 struct iso_directory_record *raw_de;
704 unsigned long block, offset;
705 int sig;
706 struct rock_ridge *rr;
707 struct rock_state rs;
708 int ret;
709
710 if (!sbi->s_rock)
711 goto error;
712
713 init_rock_state(&rs, inode);
714 block = ei->i_iget5_block;
715 bh = sb_bread(inode->i_sb, block);
716 if (!bh)
717 goto out_noread;
718
719 offset = ei->i_iget5_offset;
720 pnt = (unsigned char *)bh->b_data + offset;
721
722 raw_de = (struct iso_directory_record *)pnt;
723
724 /*
725 * If we go past the end of the buffer, there is some sort of error.
726 */
727 if (offset + *pnt > bufsize)
728 goto out_bad_span;
729
730 /*
731 * Now test for possible Rock Ridge extensions which will override
732 * some of these numbers in the inode structure.
733 */
734
735 setup_rock_ridge(raw_de, inode, &rs);
736
737 repeat:
738 while (rs.len > 2) { /* There may be one byte for padding somewhere */
739 rr = (struct rock_ridge *)rs.chr;
740 if (rr->len < 3)
741 goto out; /* Something got screwed up here */
742 sig = isonum_721(rs.chr);
743 if (rock_check_overflow(&rs, sig))
744 goto out;
745 rs.chr += rr->len;
746 rs.len -= rr->len;
747 if (rs.len < 0)
748 goto out; /* corrupted isofs */
749
750 switch (sig) {
751 case SIG('R', 'R'):
752 if ((rr->u.RR.flags[0] & RR_SL) == 0)
753 goto out;
754 break;
755 case SIG('S', 'P'):
756 if (check_sp(rr, inode))
757 goto out;
758 break;
759 case SIG('S', 'L'):
760 rpnt = get_symlink_chunk(rpnt, rr,
761 link + (PAGE_SIZE - 1));
762 if (rpnt == NULL)
763 goto out;
764 break;
765 case SIG('C', 'E'):
766 /* This tells is if there is a continuation record */
767 rs.cont_extent = isonum_733(rr->u.CE.extent);
768 rs.cont_offset = isonum_733(rr->u.CE.offset);
769 rs.cont_size = isonum_733(rr->u.CE.size);
770 default:
771 break;
772 }
773 }
774 ret = rock_continue(&rs);
775 if (ret == 0)
776 goto repeat;
777 if (ret < 0)
778 goto fail;
779
780 if (rpnt == link)
781 goto fail;
782 brelse(bh);
783 *rpnt = '\0';
784 SetPageUptodate(page);
785 unlock_page(page);
786 return 0;
787
788 /* error exit from macro */
789 out:
790 kfree(rs.buffer);
791 goto fail;
792 out_noread:
793 printk("unable to read i-node block");
794 goto fail;
795 out_bad_span:
796 printk("symlink spans iso9660 blocks\n");
797 fail:
798 brelse(bh);
799 error:
800 SetPageError(page);
801 unlock_page(page);
802 return -EIO;
803 }
804
805 const struct address_space_operations isofs_symlink_aops = {
806 .readpage = rock_ridge_symlink_readpage
807 };