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1 | /* |
2 | * super.c |
3 | * |
4 | * PURPOSE |
5 | * Super block routines for the OSTA-UDF(tm) filesystem. |
6 | * |
7 | * DESCRIPTION |
8 | * OSTA-UDF(tm) = Optical Storage Technology Association |
9 | * Universal Disk Format. |
10 | * |
11 | * This code is based on version 2.00 of the UDF specification, |
12 | * and revision 3 of the ECMA 167 standard [equivalent to ISO 13346]. |
13 | * http://www.osta.org/ |
14 | * http://www.ecma.ch/ |
15 | * http://www.iso.org/ |
16 | * |
17 | * COPYRIGHT |
18 | * This file is distributed under the terms of the GNU General Public |
19 | * License (GPL). Copies of the GPL can be obtained from: |
20 | * ftp://prep.ai.mit.edu/pub/gnu/GPL |
21 | * Each contributing author retains all rights to their own work. |
22 | * |
23 | * (C) 1998 Dave Boynton |
24 | * (C) 1998-2004 Ben Fennema |
25 | * (C) 2000 Stelias Computing Inc |
26 | * |
27 | * HISTORY |
28 | * |
29 | * 09/24/98 dgb changed to allow compiling outside of kernel, and |
30 | * added some debugging. |
31 | * 10/01/98 dgb updated to allow (some) possibility of compiling w/2.0.34 |
32 | * 10/16/98 attempting some multi-session support |
33 | * 10/17/98 added freespace count for "df" |
34 | * 11/11/98 gr added novrs option |
35 | * 11/26/98 dgb added fileset,anchor mount options |
36 | * 12/06/98 blf really hosed things royally. vat/sparing support. sequenced |
37 | * vol descs. rewrote option handling based on isofs |
38 | * 12/20/98 find the free space bitmap (if it exists) |
39 | */ |
40 | |
41 | #include "udfdecl.h" |
42 | |
43 | #include <linux/blkdev.h> |
44 | #include <linux/slab.h> |
45 | #include <linux/kernel.h> |
46 | #include <linux/module.h> |
47 | #include <linux/parser.h> |
48 | #include <linux/stat.h> |
49 | #include <linux/cdrom.h> |
50 | #include <linux/nls.h> |
51 | #include <linux/smp_lock.h> |
52 | #include <linux/buffer_head.h> |
53 | #include <linux/vfs.h> |
54 | #include <linux/vmalloc.h> |
55 | #include <linux/errno.h> |
56 | #include <linux/mount.h> |
57 | #include <linux/seq_file.h> |
58 | #include <linux/bitmap.h> |
59 | #include <linux/crc-itu-t.h> |
60 | #include <asm/byteorder.h> |
61 | |
62 | #include "udf_sb.h" |
63 | #include "udf_i.h" |
64 | |
65 | #include <linux/init.h> |
66 | #include <asm/uaccess.h> |
67 | |
68 | #define VDS_POS_PRIMARY_VOL_DESC 0 |
69 | #define VDS_POS_UNALLOC_SPACE_DESC 1 |
70 | #define VDS_POS_LOGICAL_VOL_DESC 2 |
71 | #define VDS_POS_PARTITION_DESC 3 |
72 | #define VDS_POS_IMP_USE_VOL_DESC 4 |
73 | #define VDS_POS_VOL_DESC_PTR 5 |
74 | #define VDS_POS_TERMINATING_DESC 6 |
75 | #define VDS_POS_LENGTH 7 |
76 | |
77 | #define UDF_DEFAULT_BLOCKSIZE 2048 |
78 | |
79 | static char error_buf[1024]; |
80 | |
81 | /* These are the "meat" - everything else is stuffing */ |
82 | static int udf_fill_super(struct super_block *, void *, int); |
83 | static void udf_put_super(struct super_block *); |
84 | static int udf_sync_fs(struct super_block *, int); |
85 | static int udf_remount_fs(struct super_block *, int *, char *); |
86 | static void udf_load_logicalvolint(struct super_block *, struct kernel_extent_ad); |
87 | static int udf_find_fileset(struct super_block *, struct kernel_lb_addr *, |
88 | struct kernel_lb_addr *); |
89 | static void udf_load_fileset(struct super_block *, struct buffer_head *, |
90 | struct kernel_lb_addr *); |
91 | static void udf_open_lvid(struct super_block *); |
92 | static void udf_close_lvid(struct super_block *); |
93 | static unsigned int udf_count_free(struct super_block *); |
94 | static int udf_statfs(struct dentry *, struct kstatfs *); |
95 | static int udf_show_options(struct seq_file *, struct vfsmount *); |
96 | static void udf_error(struct super_block *sb, const char *function, |
97 | const char *fmt, ...); |
98 | |
99 | struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct udf_sb_info *sbi) |
100 | { |
101 | struct logicalVolIntegrityDesc *lvid = |
102 | (struct logicalVolIntegrityDesc *)sbi->s_lvid_bh->b_data; |
103 | __u32 number_of_partitions = le32_to_cpu(lvid->numOfPartitions); |
104 | __u32 offset = number_of_partitions * 2 * |
105 | sizeof(uint32_t)/sizeof(uint8_t); |
106 | return (struct logicalVolIntegrityDescImpUse *)&(lvid->impUse[offset]); |
107 | } |
108 | |
109 | /* UDF filesystem type */ |
110 | static int udf_get_sb(struct file_system_type *fs_type, |
111 | int flags, const char *dev_name, void *data, |
112 | struct vfsmount *mnt) |
113 | { |
114 | return get_sb_bdev(fs_type, flags, dev_name, data, udf_fill_super, mnt); |
115 | } |
116 | |
117 | static struct file_system_type udf_fstype = { |
118 | .owner = THIS_MODULE, |
119 | .name = "udf", |
120 | .get_sb = udf_get_sb, |
121 | .kill_sb = kill_block_super, |
122 | .fs_flags = FS_REQUIRES_DEV, |
123 | }; |
124 | |
125 | static struct kmem_cache *udf_inode_cachep; |
126 | |
127 | static struct inode *udf_alloc_inode(struct super_block *sb) |
128 | { |
129 | struct udf_inode_info *ei; |
130 | ei = kmem_cache_alloc(udf_inode_cachep, GFP_KERNEL); |
131 | if (!ei) |
132 | return NULL; |
133 | |
134 | ei->i_unique = 0; |
135 | ei->i_lenExtents = 0; |
136 | ei->i_next_alloc_block = 0; |
137 | ei->i_next_alloc_goal = 0; |
138 | ei->i_strat4096 = 0; |
139 | |
140 | return &ei->vfs_inode; |
141 | } |
142 | |
143 | static void udf_destroy_inode(struct inode *inode) |
144 | { |
145 | kmem_cache_free(udf_inode_cachep, UDF_I(inode)); |
146 | } |
147 | |
148 | static void init_once(void *foo) |
149 | { |
150 | struct udf_inode_info *ei = (struct udf_inode_info *)foo; |
151 | |
152 | ei->i_ext.i_data = NULL; |
153 | inode_init_once(&ei->vfs_inode); |
154 | } |
155 | |
156 | static int init_inodecache(void) |
157 | { |
158 | udf_inode_cachep = kmem_cache_create("udf_inode_cache", |
159 | sizeof(struct udf_inode_info), |
160 | 0, (SLAB_RECLAIM_ACCOUNT | |
161 | SLAB_MEM_SPREAD), |
162 | init_once); |
163 | if (!udf_inode_cachep) |
164 | return -ENOMEM; |
165 | return 0; |
166 | } |
167 | |
168 | static void destroy_inodecache(void) |
169 | { |
170 | kmem_cache_destroy(udf_inode_cachep); |
171 | } |
172 | |
173 | /* Superblock operations */ |
174 | static const struct super_operations udf_sb_ops = { |
175 | .alloc_inode = udf_alloc_inode, |
176 | .destroy_inode = udf_destroy_inode, |
177 | .write_inode = udf_write_inode, |
178 | .delete_inode = udf_delete_inode, |
179 | .clear_inode = udf_clear_inode, |
180 | .put_super = udf_put_super, |
181 | .sync_fs = udf_sync_fs, |
182 | .statfs = udf_statfs, |
183 | .remount_fs = udf_remount_fs, |
184 | .show_options = udf_show_options, |
185 | }; |
186 | |
187 | struct udf_options { |
188 | unsigned char novrs; |
189 | unsigned int blocksize; |
190 | unsigned int session; |
191 | unsigned int lastblock; |
192 | unsigned int anchor; |
193 | unsigned int volume; |
194 | unsigned short partition; |
195 | unsigned int fileset; |
196 | unsigned int rootdir; |
197 | unsigned int flags; |
198 | mode_t umask; |
199 | gid_t gid; |
200 | uid_t uid; |
201 | mode_t fmode; |
202 | mode_t dmode; |
203 | struct nls_table *nls_map; |
204 | }; |
205 | |
206 | static int __init init_udf_fs(void) |
207 | { |
208 | int err; |
209 | |
210 | err = init_inodecache(); |
211 | if (err) |
212 | goto out1; |
213 | err = register_filesystem(&udf_fstype); |
214 | if (err) |
215 | goto out; |
216 | |
217 | return 0; |
218 | |
219 | out: |
220 | destroy_inodecache(); |
221 | |
222 | out1: |
223 | return err; |
224 | } |
225 | |
226 | static void __exit exit_udf_fs(void) |
227 | { |
228 | unregister_filesystem(&udf_fstype); |
229 | destroy_inodecache(); |
230 | } |
231 | |
232 | module_init(init_udf_fs) |
233 | module_exit(exit_udf_fs) |
234 | |
235 | static int udf_sb_alloc_partition_maps(struct super_block *sb, u32 count) |
236 | { |
237 | struct udf_sb_info *sbi = UDF_SB(sb); |
238 | |
239 | sbi->s_partmaps = kcalloc(count, sizeof(struct udf_part_map), |
240 | GFP_KERNEL); |
241 | if (!sbi->s_partmaps) { |
242 | udf_error(sb, __func__, |
243 | "Unable to allocate space for %d partition maps", |
244 | count); |
245 | sbi->s_partitions = 0; |
246 | return -ENOMEM; |
247 | } |
248 | |
249 | sbi->s_partitions = count; |
250 | return 0; |
251 | } |
252 | |
253 | static int udf_show_options(struct seq_file *seq, struct vfsmount *mnt) |
254 | { |
255 | struct super_block *sb = mnt->mnt_sb; |
256 | struct udf_sb_info *sbi = UDF_SB(sb); |
257 | |
258 | if (!UDF_QUERY_FLAG(sb, UDF_FLAG_STRICT)) |
259 | seq_puts(seq, ",nostrict"); |
260 | if (UDF_QUERY_FLAG(sb, UDF_FLAG_BLOCKSIZE_SET)) |
261 | seq_printf(seq, ",bs=%lu", sb->s_blocksize); |
262 | if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNHIDE)) |
263 | seq_puts(seq, ",unhide"); |
264 | if (UDF_QUERY_FLAG(sb, UDF_FLAG_UNDELETE)) |
265 | seq_puts(seq, ",undelete"); |
266 | if (!UDF_QUERY_FLAG(sb, UDF_FLAG_USE_AD_IN_ICB)) |
267 | seq_puts(seq, ",noadinicb"); |
268 | if (UDF_QUERY_FLAG(sb, UDF_FLAG_USE_SHORT_AD)) |
269 | seq_puts(seq, ",shortad"); |
270 | if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_FORGET)) |
271 | seq_puts(seq, ",uid=forget"); |
272 | if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_IGNORE)) |
273 | seq_puts(seq, ",uid=ignore"); |
274 | if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_FORGET)) |
275 | seq_puts(seq, ",gid=forget"); |
276 | if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_IGNORE)) |
277 | seq_puts(seq, ",gid=ignore"); |
278 | if (UDF_QUERY_FLAG(sb, UDF_FLAG_UID_SET)) |
279 | seq_printf(seq, ",uid=%u", sbi->s_uid); |
280 | if (UDF_QUERY_FLAG(sb, UDF_FLAG_GID_SET)) |
281 | seq_printf(seq, ",gid=%u", sbi->s_gid); |
282 | if (sbi->s_umask != 0) |
283 | seq_printf(seq, ",umask=%o", sbi->s_umask); |
284 | if (sbi->s_fmode != UDF_INVALID_MODE) |
285 | seq_printf(seq, ",mode=%o", sbi->s_fmode); |
286 | if (sbi->s_dmode != UDF_INVALID_MODE) |
287 | seq_printf(seq, ",dmode=%o", sbi->s_dmode); |
288 | if (UDF_QUERY_FLAG(sb, UDF_FLAG_SESSION_SET)) |
289 | seq_printf(seq, ",session=%u", sbi->s_session); |
290 | if (UDF_QUERY_FLAG(sb, UDF_FLAG_LASTBLOCK_SET)) |
291 | seq_printf(seq, ",lastblock=%u", sbi->s_last_block); |
292 | if (sbi->s_anchor != 0) |
293 | seq_printf(seq, ",anchor=%u", sbi->s_anchor); |
294 | /* |
295 | * volume, partition, fileset and rootdir seem to be ignored |
296 | * currently |
297 | */ |
298 | if (UDF_QUERY_FLAG(sb, UDF_FLAG_UTF8)) |
299 | seq_puts(seq, ",utf8"); |
300 | if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP) && sbi->s_nls_map) |
301 | seq_printf(seq, ",iocharset=%s", sbi->s_nls_map->charset); |
302 | |
303 | return 0; |
304 | } |
305 | |
306 | /* |
307 | * udf_parse_options |
308 | * |
309 | * PURPOSE |
310 | * Parse mount options. |
311 | * |
312 | * DESCRIPTION |
313 | * The following mount options are supported: |
314 | * |
315 | * gid= Set the default group. |
316 | * umask= Set the default umask. |
317 | * mode= Set the default file permissions. |
318 | * dmode= Set the default directory permissions. |
319 | * uid= Set the default user. |
320 | * bs= Set the block size. |
321 | * unhide Show otherwise hidden files. |
322 | * undelete Show deleted files in lists. |
323 | * adinicb Embed data in the inode (default) |
324 | * noadinicb Don't embed data in the inode |
325 | * shortad Use short ad's |
326 | * longad Use long ad's (default) |
327 | * nostrict Unset strict conformance |
328 | * iocharset= Set the NLS character set |
329 | * |
330 | * The remaining are for debugging and disaster recovery: |
331 | * |
332 | * novrs Skip volume sequence recognition |
333 | * |
334 | * The following expect a offset from 0. |
335 | * |
336 | * session= Set the CDROM session (default= last session) |
337 | * anchor= Override standard anchor location. (default= 256) |
338 | * volume= Override the VolumeDesc location. (unused) |
339 | * partition= Override the PartitionDesc location. (unused) |
340 | * lastblock= Set the last block of the filesystem/ |
341 | * |
342 | * The following expect a offset from the partition root. |
343 | * |
344 | * fileset= Override the fileset block location. (unused) |
345 | * rootdir= Override the root directory location. (unused) |
346 | * WARNING: overriding the rootdir to a non-directory may |
347 | * yield highly unpredictable results. |
348 | * |
349 | * PRE-CONDITIONS |
350 | * options Pointer to mount options string. |
351 | * uopts Pointer to mount options variable. |
352 | * |
353 | * POST-CONDITIONS |
354 | * <return> 1 Mount options parsed okay. |
355 | * <return> 0 Error parsing mount options. |
356 | * |
357 | * HISTORY |
358 | * July 1, 1997 - Andrew E. Mileski |
359 | * Written, tested, and released. |
360 | */ |
361 | |
362 | enum { |
363 | Opt_novrs, Opt_nostrict, Opt_bs, Opt_unhide, Opt_undelete, |
364 | Opt_noadinicb, Opt_adinicb, Opt_shortad, Opt_longad, |
365 | Opt_gid, Opt_uid, Opt_umask, Opt_session, Opt_lastblock, |
366 | Opt_anchor, Opt_volume, Opt_partition, Opt_fileset, |
367 | Opt_rootdir, Opt_utf8, Opt_iocharset, |
368 | Opt_err, Opt_uforget, Opt_uignore, Opt_gforget, Opt_gignore, |
369 | Opt_fmode, Opt_dmode |
370 | }; |
371 | |
372 | static const match_table_t tokens = { |
373 | {Opt_novrs, "novrs"}, |
374 | {Opt_nostrict, "nostrict"}, |
375 | {Opt_bs, "bs=%u"}, |
376 | {Opt_unhide, "unhide"}, |
377 | {Opt_undelete, "undelete"}, |
378 | {Opt_noadinicb, "noadinicb"}, |
379 | {Opt_adinicb, "adinicb"}, |
380 | {Opt_shortad, "shortad"}, |
381 | {Opt_longad, "longad"}, |
382 | {Opt_uforget, "uid=forget"}, |
383 | {Opt_uignore, "uid=ignore"}, |
384 | {Opt_gforget, "gid=forget"}, |
385 | {Opt_gignore, "gid=ignore"}, |
386 | {Opt_gid, "gid=%u"}, |
387 | {Opt_uid, "uid=%u"}, |
388 | {Opt_umask, "umask=%o"}, |
389 | {Opt_session, "session=%u"}, |
390 | {Opt_lastblock, "lastblock=%u"}, |
391 | {Opt_anchor, "anchor=%u"}, |
392 | {Opt_volume, "volume=%u"}, |
393 | {Opt_partition, "partition=%u"}, |
394 | {Opt_fileset, "fileset=%u"}, |
395 | {Opt_rootdir, "rootdir=%u"}, |
396 | {Opt_utf8, "utf8"}, |
397 | {Opt_iocharset, "iocharset=%s"}, |
398 | {Opt_fmode, "mode=%o"}, |
399 | {Opt_dmode, "dmode=%o"}, |
400 | {Opt_err, NULL} |
401 | }; |
402 | |
403 | static int udf_parse_options(char *options, struct udf_options *uopt, |
404 | bool remount) |
405 | { |
406 | char *p; |
407 | int option; |
408 | |
409 | uopt->novrs = 0; |
410 | uopt->partition = 0xFFFF; |
411 | uopt->session = 0xFFFFFFFF; |
412 | uopt->lastblock = 0; |
413 | uopt->anchor = 0; |
414 | uopt->volume = 0xFFFFFFFF; |
415 | uopt->rootdir = 0xFFFFFFFF; |
416 | uopt->fileset = 0xFFFFFFFF; |
417 | uopt->nls_map = NULL; |
418 | |
419 | if (!options) |
420 | return 1; |
421 | |
422 | while ((p = strsep(&options, ",")) != NULL) { |
423 | substring_t args[MAX_OPT_ARGS]; |
424 | int token; |
425 | if (!*p) |
426 | continue; |
427 | |
428 | token = match_token(p, tokens, args); |
429 | switch (token) { |
430 | case Opt_novrs: |
431 | uopt->novrs = 1; |
432 | break; |
433 | case Opt_bs: |
434 | if (match_int(&args[0], &option)) |
435 | return 0; |
436 | uopt->blocksize = option; |
437 | uopt->flags |= (1 << UDF_FLAG_BLOCKSIZE_SET); |
438 | break; |
439 | case Opt_unhide: |
440 | uopt->flags |= (1 << UDF_FLAG_UNHIDE); |
441 | break; |
442 | case Opt_undelete: |
443 | uopt->flags |= (1 << UDF_FLAG_UNDELETE); |
444 | break; |
445 | case Opt_noadinicb: |
446 | uopt->flags &= ~(1 << UDF_FLAG_USE_AD_IN_ICB); |
447 | break; |
448 | case Opt_adinicb: |
449 | uopt->flags |= (1 << UDF_FLAG_USE_AD_IN_ICB); |
450 | break; |
451 | case Opt_shortad: |
452 | uopt->flags |= (1 << UDF_FLAG_USE_SHORT_AD); |
453 | break; |
454 | case Opt_longad: |
455 | uopt->flags &= ~(1 << UDF_FLAG_USE_SHORT_AD); |
456 | break; |
457 | case Opt_gid: |
458 | if (match_int(args, &option)) |
459 | return 0; |
460 | uopt->gid = option; |
461 | uopt->flags |= (1 << UDF_FLAG_GID_SET); |
462 | break; |
463 | case Opt_uid: |
464 | if (match_int(args, &option)) |
465 | return 0; |
466 | uopt->uid = option; |
467 | uopt->flags |= (1 << UDF_FLAG_UID_SET); |
468 | break; |
469 | case Opt_umask: |
470 | if (match_octal(args, &option)) |
471 | return 0; |
472 | uopt->umask = option; |
473 | break; |
474 | case Opt_nostrict: |
475 | uopt->flags &= ~(1 << UDF_FLAG_STRICT); |
476 | break; |
477 | case Opt_session: |
478 | if (match_int(args, &option)) |
479 | return 0; |
480 | uopt->session = option; |
481 | if (!remount) |
482 | uopt->flags |= (1 << UDF_FLAG_SESSION_SET); |
483 | break; |
484 | case Opt_lastblock: |
485 | if (match_int(args, &option)) |
486 | return 0; |
487 | uopt->lastblock = option; |
488 | if (!remount) |
489 | uopt->flags |= (1 << UDF_FLAG_LASTBLOCK_SET); |
490 | break; |
491 | case Opt_anchor: |
492 | if (match_int(args, &option)) |
493 | return 0; |
494 | uopt->anchor = option; |
495 | break; |
496 | case Opt_volume: |
497 | if (match_int(args, &option)) |
498 | return 0; |
499 | uopt->volume = option; |
500 | break; |
501 | case Opt_partition: |
502 | if (match_int(args, &option)) |
503 | return 0; |
504 | uopt->partition = option; |
505 | break; |
506 | case Opt_fileset: |
507 | if (match_int(args, &option)) |
508 | return 0; |
509 | uopt->fileset = option; |
510 | break; |
511 | case Opt_rootdir: |
512 | if (match_int(args, &option)) |
513 | return 0; |
514 | uopt->rootdir = option; |
515 | break; |
516 | case Opt_utf8: |
517 | uopt->flags |= (1 << UDF_FLAG_UTF8); |
518 | break; |
519 | #ifdef CONFIG_UDF_NLS |
520 | case Opt_iocharset: |
521 | uopt->nls_map = load_nls(args[0].from); |
522 | uopt->flags |= (1 << UDF_FLAG_NLS_MAP); |
523 | break; |
524 | #endif |
525 | case Opt_uignore: |
526 | uopt->flags |= (1 << UDF_FLAG_UID_IGNORE); |
527 | break; |
528 | case Opt_uforget: |
529 | uopt->flags |= (1 << UDF_FLAG_UID_FORGET); |
530 | break; |
531 | case Opt_gignore: |
532 | uopt->flags |= (1 << UDF_FLAG_GID_IGNORE); |
533 | break; |
534 | case Opt_gforget: |
535 | uopt->flags |= (1 << UDF_FLAG_GID_FORGET); |
536 | break; |
537 | case Opt_fmode: |
538 | if (match_octal(args, &option)) |
539 | return 0; |
540 | uopt->fmode = option & 0777; |
541 | break; |
542 | case Opt_dmode: |
543 | if (match_octal(args, &option)) |
544 | return 0; |
545 | uopt->dmode = option & 0777; |
546 | break; |
547 | default: |
548 | printk(KERN_ERR "udf: bad mount option \"%s\" " |
549 | "or missing value\n", p); |
550 | return 0; |
551 | } |
552 | } |
553 | return 1; |
554 | } |
555 | |
556 | static int udf_remount_fs(struct super_block *sb, int *flags, char *options) |
557 | { |
558 | struct udf_options uopt; |
559 | struct udf_sb_info *sbi = UDF_SB(sb); |
560 | |
561 | uopt.flags = sbi->s_flags; |
562 | uopt.uid = sbi->s_uid; |
563 | uopt.gid = sbi->s_gid; |
564 | uopt.umask = sbi->s_umask; |
565 | uopt.fmode = sbi->s_fmode; |
566 | uopt.dmode = sbi->s_dmode; |
567 | |
568 | if (!udf_parse_options(options, &uopt, true)) |
569 | return -EINVAL; |
570 | |
571 | lock_kernel(); |
572 | sbi->s_flags = uopt.flags; |
573 | sbi->s_uid = uopt.uid; |
574 | sbi->s_gid = uopt.gid; |
575 | sbi->s_umask = uopt.umask; |
576 | sbi->s_fmode = uopt.fmode; |
577 | sbi->s_dmode = uopt.dmode; |
578 | |
579 | if (sbi->s_lvid_bh) { |
580 | int write_rev = le16_to_cpu(udf_sb_lvidiu(sbi)->minUDFWriteRev); |
581 | if (write_rev > UDF_MAX_WRITE_VERSION) |
582 | *flags |= MS_RDONLY; |
583 | } |
584 | |
585 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) { |
586 | unlock_kernel(); |
587 | return 0; |
588 | } |
589 | if (*flags & MS_RDONLY) |
590 | udf_close_lvid(sb); |
591 | else |
592 | udf_open_lvid(sb); |
593 | |
594 | unlock_kernel(); |
595 | return 0; |
596 | } |
597 | |
598 | /* Check Volume Structure Descriptors (ECMA 167 2/9.1) */ |
599 | /* We also check any "CD-ROM Volume Descriptor Set" (ECMA 167 2/8.3.1) */ |
600 | static loff_t udf_check_vsd(struct super_block *sb) |
601 | { |
602 | struct volStructDesc *vsd = NULL; |
603 | loff_t sector = 32768; |
604 | int sectorsize; |
605 | struct buffer_head *bh = NULL; |
606 | int nsr02 = 0; |
607 | int nsr03 = 0; |
608 | struct udf_sb_info *sbi; |
609 | |
610 | sbi = UDF_SB(sb); |
611 | if (sb->s_blocksize < sizeof(struct volStructDesc)) |
612 | sectorsize = sizeof(struct volStructDesc); |
613 | else |
614 | sectorsize = sb->s_blocksize; |
615 | |
616 | sector += (sbi->s_session << sb->s_blocksize_bits); |
617 | |
618 | udf_debug("Starting at sector %u (%ld byte sectors)\n", |
619 | (unsigned int)(sector >> sb->s_blocksize_bits), |
620 | sb->s_blocksize); |
621 | /* Process the sequence (if applicable) */ |
622 | for (; !nsr02 && !nsr03; sector += sectorsize) { |
623 | /* Read a block */ |
624 | bh = udf_tread(sb, sector >> sb->s_blocksize_bits); |
625 | if (!bh) |
626 | break; |
627 | |
628 | /* Look for ISO descriptors */ |
629 | vsd = (struct volStructDesc *)(bh->b_data + |
630 | (sector & (sb->s_blocksize - 1))); |
631 | |
632 | if (vsd->stdIdent[0] == 0) { |
633 | brelse(bh); |
634 | break; |
635 | } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_CD001, |
636 | VSD_STD_ID_LEN)) { |
637 | switch (vsd->structType) { |
638 | case 0: |
639 | udf_debug("ISO9660 Boot Record found\n"); |
640 | break; |
641 | case 1: |
642 | udf_debug("ISO9660 Primary Volume Descriptor " |
643 | "found\n"); |
644 | break; |
645 | case 2: |
646 | udf_debug("ISO9660 Supplementary Volume " |
647 | "Descriptor found\n"); |
648 | break; |
649 | case 3: |
650 | udf_debug("ISO9660 Volume Partition Descriptor " |
651 | "found\n"); |
652 | break; |
653 | case 255: |
654 | udf_debug("ISO9660 Volume Descriptor Set " |
655 | "Terminator found\n"); |
656 | break; |
657 | default: |
658 | udf_debug("ISO9660 VRS (%u) found\n", |
659 | vsd->structType); |
660 | break; |
661 | } |
662 | } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_BEA01, |
663 | VSD_STD_ID_LEN)) |
664 | ; /* nothing */ |
665 | else if (!strncmp(vsd->stdIdent, VSD_STD_ID_TEA01, |
666 | VSD_STD_ID_LEN)) { |
667 | brelse(bh); |
668 | break; |
669 | } else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR02, |
670 | VSD_STD_ID_LEN)) |
671 | nsr02 = sector; |
672 | else if (!strncmp(vsd->stdIdent, VSD_STD_ID_NSR03, |
673 | VSD_STD_ID_LEN)) |
674 | nsr03 = sector; |
675 | brelse(bh); |
676 | } |
677 | |
678 | if (nsr03) |
679 | return nsr03; |
680 | else if (nsr02) |
681 | return nsr02; |
682 | else if (sector - (sbi->s_session << sb->s_blocksize_bits) == 32768) |
683 | return -1; |
684 | else |
685 | return 0; |
686 | } |
687 | |
688 | static int udf_find_fileset(struct super_block *sb, |
689 | struct kernel_lb_addr *fileset, |
690 | struct kernel_lb_addr *root) |
691 | { |
692 | struct buffer_head *bh = NULL; |
693 | long lastblock; |
694 | uint16_t ident; |
695 | struct udf_sb_info *sbi; |
696 | |
697 | if (fileset->logicalBlockNum != 0xFFFFFFFF || |
698 | fileset->partitionReferenceNum != 0xFFFF) { |
699 | bh = udf_read_ptagged(sb, fileset, 0, &ident); |
700 | |
701 | if (!bh) { |
702 | return 1; |
703 | } else if (ident != TAG_IDENT_FSD) { |
704 | brelse(bh); |
705 | return 1; |
706 | } |
707 | |
708 | } |
709 | |
710 | sbi = UDF_SB(sb); |
711 | if (!bh) { |
712 | /* Search backwards through the partitions */ |
713 | struct kernel_lb_addr newfileset; |
714 | |
715 | /* --> cvg: FIXME - is it reasonable? */ |
716 | return 1; |
717 | |
718 | for (newfileset.partitionReferenceNum = sbi->s_partitions - 1; |
719 | (newfileset.partitionReferenceNum != 0xFFFF && |
720 | fileset->logicalBlockNum == 0xFFFFFFFF && |
721 | fileset->partitionReferenceNum == 0xFFFF); |
722 | newfileset.partitionReferenceNum--) { |
723 | lastblock = sbi->s_partmaps |
724 | [newfileset.partitionReferenceNum] |
725 | .s_partition_len; |
726 | newfileset.logicalBlockNum = 0; |
727 | |
728 | do { |
729 | bh = udf_read_ptagged(sb, &newfileset, 0, |
730 | &ident); |
731 | if (!bh) { |
732 | newfileset.logicalBlockNum++; |
733 | continue; |
734 | } |
735 | |
736 | switch (ident) { |
737 | case TAG_IDENT_SBD: |
738 | { |
739 | struct spaceBitmapDesc *sp; |
740 | sp = (struct spaceBitmapDesc *) |
741 | bh->b_data; |
742 | newfileset.logicalBlockNum += 1 + |
743 | ((le32_to_cpu(sp->numOfBytes) + |
744 | sizeof(struct spaceBitmapDesc) |
745 | - 1) >> sb->s_blocksize_bits); |
746 | brelse(bh); |
747 | break; |
748 | } |
749 | case TAG_IDENT_FSD: |
750 | *fileset = newfileset; |
751 | break; |
752 | default: |
753 | newfileset.logicalBlockNum++; |
754 | brelse(bh); |
755 | bh = NULL; |
756 | break; |
757 | } |
758 | } while (newfileset.logicalBlockNum < lastblock && |
759 | fileset->logicalBlockNum == 0xFFFFFFFF && |
760 | fileset->partitionReferenceNum == 0xFFFF); |
761 | } |
762 | } |
763 | |
764 | if ((fileset->logicalBlockNum != 0xFFFFFFFF || |
765 | fileset->partitionReferenceNum != 0xFFFF) && bh) { |
766 | udf_debug("Fileset at block=%d, partition=%d\n", |
767 | fileset->logicalBlockNum, |
768 | fileset->partitionReferenceNum); |
769 | |
770 | sbi->s_partition = fileset->partitionReferenceNum; |
771 | udf_load_fileset(sb, bh, root); |
772 | brelse(bh); |
773 | return 0; |
774 | } |
775 | return 1; |
776 | } |
777 | |
778 | static int udf_load_pvoldesc(struct super_block *sb, sector_t block) |
779 | { |
780 | struct primaryVolDesc *pvoldesc; |
781 | struct ustr *instr, *outstr; |
782 | struct buffer_head *bh; |
783 | uint16_t ident; |
784 | int ret = 1; |
785 | |
786 | instr = kmalloc(sizeof(struct ustr), GFP_NOFS); |
787 | if (!instr) |
788 | return 1; |
789 | |
790 | outstr = kmalloc(sizeof(struct ustr), GFP_NOFS); |
791 | if (!outstr) |
792 | goto out1; |
793 | |
794 | bh = udf_read_tagged(sb, block, block, &ident); |
795 | if (!bh) |
796 | goto out2; |
797 | |
798 | BUG_ON(ident != TAG_IDENT_PVD); |
799 | |
800 | pvoldesc = (struct primaryVolDesc *)bh->b_data; |
801 | |
802 | if (udf_disk_stamp_to_time(&UDF_SB(sb)->s_record_time, |
803 | pvoldesc->recordingDateAndTime)) { |
804 | #ifdef UDFFS_DEBUG |
805 | struct timestamp *ts = &pvoldesc->recordingDateAndTime; |
806 | udf_debug("recording time %04u/%02u/%02u" |
807 | " %02u:%02u (%x)\n", |
808 | le16_to_cpu(ts->year), ts->month, ts->day, ts->hour, |
809 | ts->minute, le16_to_cpu(ts->typeAndTimezone)); |
810 | #endif |
811 | } |
812 | |
813 | if (!udf_build_ustr(instr, pvoldesc->volIdent, 32)) |
814 | if (udf_CS0toUTF8(outstr, instr)) { |
815 | strncpy(UDF_SB(sb)->s_volume_ident, outstr->u_name, |
816 | outstr->u_len > 31 ? 31 : outstr->u_len); |
817 | udf_debug("volIdent[] = '%s'\n", |
818 | UDF_SB(sb)->s_volume_ident); |
819 | } |
820 | |
821 | if (!udf_build_ustr(instr, pvoldesc->volSetIdent, 128)) |
822 | if (udf_CS0toUTF8(outstr, instr)) |
823 | udf_debug("volSetIdent[] = '%s'\n", outstr->u_name); |
824 | |
825 | brelse(bh); |
826 | ret = 0; |
827 | out2: |
828 | kfree(outstr); |
829 | out1: |
830 | kfree(instr); |
831 | return ret; |
832 | } |
833 | |
834 | static int udf_load_metadata_files(struct super_block *sb, int partition) |
835 | { |
836 | struct udf_sb_info *sbi = UDF_SB(sb); |
837 | struct udf_part_map *map; |
838 | struct udf_meta_data *mdata; |
839 | struct kernel_lb_addr addr; |
840 | int fe_error = 0; |
841 | |
842 | map = &sbi->s_partmaps[partition]; |
843 | mdata = &map->s_type_specific.s_metadata; |
844 | |
845 | /* metadata address */ |
846 | addr.logicalBlockNum = mdata->s_meta_file_loc; |
847 | addr.partitionReferenceNum = map->s_partition_num; |
848 | |
849 | udf_debug("Metadata file location: block = %d part = %d\n", |
850 | addr.logicalBlockNum, addr.partitionReferenceNum); |
851 | |
852 | mdata->s_metadata_fe = udf_iget(sb, &addr); |
853 | |
854 | if (mdata->s_metadata_fe == NULL) { |
855 | udf_warning(sb, __func__, "metadata inode efe not found, " |
856 | "will try mirror inode."); |
857 | fe_error = 1; |
858 | } else if (UDF_I(mdata->s_metadata_fe)->i_alloc_type != |
859 | ICBTAG_FLAG_AD_SHORT) { |
860 | udf_warning(sb, __func__, "metadata inode efe does not have " |
861 | "short allocation descriptors!"); |
862 | fe_error = 1; |
863 | iput(mdata->s_metadata_fe); |
864 | mdata->s_metadata_fe = NULL; |
865 | } |
866 | |
867 | /* mirror file entry */ |
868 | addr.logicalBlockNum = mdata->s_mirror_file_loc; |
869 | addr.partitionReferenceNum = map->s_partition_num; |
870 | |
871 | udf_debug("Mirror metadata file location: block = %d part = %d\n", |
872 | addr.logicalBlockNum, addr.partitionReferenceNum); |
873 | |
874 | mdata->s_mirror_fe = udf_iget(sb, &addr); |
875 | |
876 | if (mdata->s_mirror_fe == NULL) { |
877 | if (fe_error) { |
878 | udf_error(sb, __func__, "mirror inode efe not found " |
879 | "and metadata inode is missing too, exiting..."); |
880 | goto error_exit; |
881 | } else |
882 | udf_warning(sb, __func__, "mirror inode efe not found," |
883 | " but metadata inode is OK"); |
884 | } else if (UDF_I(mdata->s_mirror_fe)->i_alloc_type != |
885 | ICBTAG_FLAG_AD_SHORT) { |
886 | udf_warning(sb, __func__, "mirror inode efe does not have " |
887 | "short allocation descriptors!"); |
888 | iput(mdata->s_mirror_fe); |
889 | mdata->s_mirror_fe = NULL; |
890 | if (fe_error) |
891 | goto error_exit; |
892 | } |
893 | |
894 | /* |
895 | * bitmap file entry |
896 | * Note: |
897 | * Load only if bitmap file location differs from 0xFFFFFFFF (DCN-5102) |
898 | */ |
899 | if (mdata->s_bitmap_file_loc != 0xFFFFFFFF) { |
900 | addr.logicalBlockNum = mdata->s_bitmap_file_loc; |
901 | addr.partitionReferenceNum = map->s_partition_num; |
902 | |
903 | udf_debug("Bitmap file location: block = %d part = %d\n", |
904 | addr.logicalBlockNum, addr.partitionReferenceNum); |
905 | |
906 | mdata->s_bitmap_fe = udf_iget(sb, &addr); |
907 | |
908 | if (mdata->s_bitmap_fe == NULL) { |
909 | if (sb->s_flags & MS_RDONLY) |
910 | udf_warning(sb, __func__, "bitmap inode efe " |
911 | "not found but it's ok since the disc" |
912 | " is mounted read-only"); |
913 | else { |
914 | udf_error(sb, __func__, "bitmap inode efe not " |
915 | "found and attempted read-write mount"); |
916 | goto error_exit; |
917 | } |
918 | } |
919 | } |
920 | |
921 | udf_debug("udf_load_metadata_files Ok\n"); |
922 | |
923 | return 0; |
924 | |
925 | error_exit: |
926 | return 1; |
927 | } |
928 | |
929 | static void udf_load_fileset(struct super_block *sb, struct buffer_head *bh, |
930 | struct kernel_lb_addr *root) |
931 | { |
932 | struct fileSetDesc *fset; |
933 | |
934 | fset = (struct fileSetDesc *)bh->b_data; |
935 | |
936 | *root = lelb_to_cpu(fset->rootDirectoryICB.extLocation); |
937 | |
938 | UDF_SB(sb)->s_serial_number = le16_to_cpu(fset->descTag.tagSerialNum); |
939 | |
940 | udf_debug("Rootdir at block=%d, partition=%d\n", |
941 | root->logicalBlockNum, root->partitionReferenceNum); |
942 | } |
943 | |
944 | int udf_compute_nr_groups(struct super_block *sb, u32 partition) |
945 | { |
946 | struct udf_part_map *map = &UDF_SB(sb)->s_partmaps[partition]; |
947 | return DIV_ROUND_UP(map->s_partition_len + |
948 | (sizeof(struct spaceBitmapDesc) << 3), |
949 | sb->s_blocksize * 8); |
950 | } |
951 | |
952 | static struct udf_bitmap *udf_sb_alloc_bitmap(struct super_block *sb, u32 index) |
953 | { |
954 | struct udf_bitmap *bitmap; |
955 | int nr_groups; |
956 | int size; |
957 | |
958 | nr_groups = udf_compute_nr_groups(sb, index); |
959 | size = sizeof(struct udf_bitmap) + |
960 | (sizeof(struct buffer_head *) * nr_groups); |
961 | |
962 | if (size <= PAGE_SIZE) |
963 | bitmap = kmalloc(size, GFP_KERNEL); |
964 | else |
965 | bitmap = vmalloc(size); /* TODO: get rid of vmalloc */ |
966 | |
967 | if (bitmap == NULL) { |
968 | udf_error(sb, __func__, |
969 | "Unable to allocate space for bitmap " |
970 | "and %d buffer_head pointers", nr_groups); |
971 | return NULL; |
972 | } |
973 | |
974 | memset(bitmap, 0x00, size); |
975 | bitmap->s_block_bitmap = (struct buffer_head **)(bitmap + 1); |
976 | bitmap->s_nr_groups = nr_groups; |
977 | return bitmap; |
978 | } |
979 | |
980 | static int udf_fill_partdesc_info(struct super_block *sb, |
981 | struct partitionDesc *p, int p_index) |
982 | { |
983 | struct udf_part_map *map; |
984 | struct udf_sb_info *sbi = UDF_SB(sb); |
985 | struct partitionHeaderDesc *phd; |
986 | |
987 | map = &sbi->s_partmaps[p_index]; |
988 | |
989 | map->s_partition_len = le32_to_cpu(p->partitionLength); /* blocks */ |
990 | map->s_partition_root = le32_to_cpu(p->partitionStartingLocation); |
991 | |
992 | if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_READ_ONLY)) |
993 | map->s_partition_flags |= UDF_PART_FLAG_READ_ONLY; |
994 | if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_WRITE_ONCE)) |
995 | map->s_partition_flags |= UDF_PART_FLAG_WRITE_ONCE; |
996 | if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_REWRITABLE)) |
997 | map->s_partition_flags |= UDF_PART_FLAG_REWRITABLE; |
998 | if (p->accessType == cpu_to_le32(PD_ACCESS_TYPE_OVERWRITABLE)) |
999 | map->s_partition_flags |= UDF_PART_FLAG_OVERWRITABLE; |
1000 | |
1001 | udf_debug("Partition (%d type %x) starts at physical %d, " |
1002 | "block length %d\n", p_index, |
1003 | map->s_partition_type, map->s_partition_root, |
1004 | map->s_partition_len); |
1005 | |
1006 | if (strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR02) && |
1007 | strcmp(p->partitionContents.ident, PD_PARTITION_CONTENTS_NSR03)) |
1008 | return 0; |
1009 | |
1010 | phd = (struct partitionHeaderDesc *)p->partitionContentsUse; |
1011 | if (phd->unallocSpaceTable.extLength) { |
1012 | struct kernel_lb_addr loc = { |
1013 | .logicalBlockNum = le32_to_cpu( |
1014 | phd->unallocSpaceTable.extPosition), |
1015 | .partitionReferenceNum = p_index, |
1016 | }; |
1017 | |
1018 | map->s_uspace.s_table = udf_iget(sb, &loc); |
1019 | if (!map->s_uspace.s_table) { |
1020 | udf_debug("cannot load unallocSpaceTable (part %d)\n", |
1021 | p_index); |
1022 | return 1; |
1023 | } |
1024 | map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_TABLE; |
1025 | udf_debug("unallocSpaceTable (part %d) @ %ld\n", |
1026 | p_index, map->s_uspace.s_table->i_ino); |
1027 | } |
1028 | |
1029 | if (phd->unallocSpaceBitmap.extLength) { |
1030 | struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index); |
1031 | if (!bitmap) |
1032 | return 1; |
1033 | map->s_uspace.s_bitmap = bitmap; |
1034 | bitmap->s_extLength = le32_to_cpu( |
1035 | phd->unallocSpaceBitmap.extLength); |
1036 | bitmap->s_extPosition = le32_to_cpu( |
1037 | phd->unallocSpaceBitmap.extPosition); |
1038 | map->s_partition_flags |= UDF_PART_FLAG_UNALLOC_BITMAP; |
1039 | udf_debug("unallocSpaceBitmap (part %d) @ %d\n", p_index, |
1040 | bitmap->s_extPosition); |
1041 | } |
1042 | |
1043 | if (phd->partitionIntegrityTable.extLength) |
1044 | udf_debug("partitionIntegrityTable (part %d)\n", p_index); |
1045 | |
1046 | if (phd->freedSpaceTable.extLength) { |
1047 | struct kernel_lb_addr loc = { |
1048 | .logicalBlockNum = le32_to_cpu( |
1049 | phd->freedSpaceTable.extPosition), |
1050 | .partitionReferenceNum = p_index, |
1051 | }; |
1052 | |
1053 | map->s_fspace.s_table = udf_iget(sb, &loc); |
1054 | if (!map->s_fspace.s_table) { |
1055 | udf_debug("cannot load freedSpaceTable (part %d)\n", |
1056 | p_index); |
1057 | return 1; |
1058 | } |
1059 | |
1060 | map->s_partition_flags |= UDF_PART_FLAG_FREED_TABLE; |
1061 | udf_debug("freedSpaceTable (part %d) @ %ld\n", |
1062 | p_index, map->s_fspace.s_table->i_ino); |
1063 | } |
1064 | |
1065 | if (phd->freedSpaceBitmap.extLength) { |
1066 | struct udf_bitmap *bitmap = udf_sb_alloc_bitmap(sb, p_index); |
1067 | if (!bitmap) |
1068 | return 1; |
1069 | map->s_fspace.s_bitmap = bitmap; |
1070 | bitmap->s_extLength = le32_to_cpu( |
1071 | phd->freedSpaceBitmap.extLength); |
1072 | bitmap->s_extPosition = le32_to_cpu( |
1073 | phd->freedSpaceBitmap.extPosition); |
1074 | map->s_partition_flags |= UDF_PART_FLAG_FREED_BITMAP; |
1075 | udf_debug("freedSpaceBitmap (part %d) @ %d\n", p_index, |
1076 | bitmap->s_extPosition); |
1077 | } |
1078 | return 0; |
1079 | } |
1080 | |
1081 | static int udf_load_vat(struct super_block *sb, int p_index, int type1_index) |
1082 | { |
1083 | struct udf_sb_info *sbi = UDF_SB(sb); |
1084 | struct udf_part_map *map = &sbi->s_partmaps[p_index]; |
1085 | struct kernel_lb_addr ino; |
1086 | struct buffer_head *bh = NULL; |
1087 | struct udf_inode_info *vati; |
1088 | uint32_t pos; |
1089 | struct virtualAllocationTable20 *vat20; |
1090 | sector_t blocks = sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits; |
1091 | |
1092 | /* VAT file entry is in the last recorded block */ |
1093 | ino.partitionReferenceNum = type1_index; |
1094 | ino.logicalBlockNum = sbi->s_last_block - map->s_partition_root; |
1095 | sbi->s_vat_inode = udf_iget(sb, &ino); |
1096 | if (!sbi->s_vat_inode && |
1097 | sbi->s_last_block != blocks - 1) { |
1098 | printk(KERN_NOTICE "UDF-fs: Failed to read VAT inode from the" |
1099 | " last recorded block (%lu), retrying with the last " |
1100 | "block of the device (%lu).\n", |
1101 | (unsigned long)sbi->s_last_block, |
1102 | (unsigned long)blocks - 1); |
1103 | ino.partitionReferenceNum = type1_index; |
1104 | ino.logicalBlockNum = blocks - 1 - map->s_partition_root; |
1105 | sbi->s_vat_inode = udf_iget(sb, &ino); |
1106 | } |
1107 | if (!sbi->s_vat_inode) |
1108 | return 1; |
1109 | |
1110 | if (map->s_partition_type == UDF_VIRTUAL_MAP15) { |
1111 | map->s_type_specific.s_virtual.s_start_offset = 0; |
1112 | map->s_type_specific.s_virtual.s_num_entries = |
1113 | (sbi->s_vat_inode->i_size - 36) >> 2; |
1114 | } else if (map->s_partition_type == UDF_VIRTUAL_MAP20) { |
1115 | vati = UDF_I(sbi->s_vat_inode); |
1116 | if (vati->i_alloc_type != ICBTAG_FLAG_AD_IN_ICB) { |
1117 | pos = udf_block_map(sbi->s_vat_inode, 0); |
1118 | bh = sb_bread(sb, pos); |
1119 | if (!bh) |
1120 | return 1; |
1121 | vat20 = (struct virtualAllocationTable20 *)bh->b_data; |
1122 | } else { |
1123 | vat20 = (struct virtualAllocationTable20 *) |
1124 | vati->i_ext.i_data; |
1125 | } |
1126 | |
1127 | map->s_type_specific.s_virtual.s_start_offset = |
1128 | le16_to_cpu(vat20->lengthHeader); |
1129 | map->s_type_specific.s_virtual.s_num_entries = |
1130 | (sbi->s_vat_inode->i_size - |
1131 | map->s_type_specific.s_virtual. |
1132 | s_start_offset) >> 2; |
1133 | brelse(bh); |
1134 | } |
1135 | return 0; |
1136 | } |
1137 | |
1138 | static int udf_load_partdesc(struct super_block *sb, sector_t block) |
1139 | { |
1140 | struct buffer_head *bh; |
1141 | struct partitionDesc *p; |
1142 | struct udf_part_map *map; |
1143 | struct udf_sb_info *sbi = UDF_SB(sb); |
1144 | int i, type1_idx; |
1145 | uint16_t partitionNumber; |
1146 | uint16_t ident; |
1147 | int ret = 0; |
1148 | |
1149 | bh = udf_read_tagged(sb, block, block, &ident); |
1150 | if (!bh) |
1151 | return 1; |
1152 | if (ident != TAG_IDENT_PD) |
1153 | goto out_bh; |
1154 | |
1155 | p = (struct partitionDesc *)bh->b_data; |
1156 | partitionNumber = le16_to_cpu(p->partitionNumber); |
1157 | |
1158 | /* First scan for TYPE1, SPARABLE and METADATA partitions */ |
1159 | for (i = 0; i < sbi->s_partitions; i++) { |
1160 | map = &sbi->s_partmaps[i]; |
1161 | udf_debug("Searching map: (%d == %d)\n", |
1162 | map->s_partition_num, partitionNumber); |
1163 | if (map->s_partition_num == partitionNumber && |
1164 | (map->s_partition_type == UDF_TYPE1_MAP15 || |
1165 | map->s_partition_type == UDF_SPARABLE_MAP15)) |
1166 | break; |
1167 | } |
1168 | |
1169 | if (i >= sbi->s_partitions) { |
1170 | udf_debug("Partition (%d) not found in partition map\n", |
1171 | partitionNumber); |
1172 | goto out_bh; |
1173 | } |
1174 | |
1175 | ret = udf_fill_partdesc_info(sb, p, i); |
1176 | |
1177 | /* |
1178 | * Now rescan for VIRTUAL or METADATA partitions when SPARABLE and |
1179 | * PHYSICAL partitions are already set up |
1180 | */ |
1181 | type1_idx = i; |
1182 | for (i = 0; i < sbi->s_partitions; i++) { |
1183 | map = &sbi->s_partmaps[i]; |
1184 | |
1185 | if (map->s_partition_num == partitionNumber && |
1186 | (map->s_partition_type == UDF_VIRTUAL_MAP15 || |
1187 | map->s_partition_type == UDF_VIRTUAL_MAP20 || |
1188 | map->s_partition_type == UDF_METADATA_MAP25)) |
1189 | break; |
1190 | } |
1191 | |
1192 | if (i >= sbi->s_partitions) |
1193 | goto out_bh; |
1194 | |
1195 | ret = udf_fill_partdesc_info(sb, p, i); |
1196 | if (ret) |
1197 | goto out_bh; |
1198 | |
1199 | if (map->s_partition_type == UDF_METADATA_MAP25) { |
1200 | ret = udf_load_metadata_files(sb, i); |
1201 | if (ret) { |
1202 | printk(KERN_ERR "UDF-fs: error loading MetaData " |
1203 | "partition map %d\n", i); |
1204 | goto out_bh; |
1205 | } |
1206 | } else { |
1207 | ret = udf_load_vat(sb, i, type1_idx); |
1208 | if (ret) |
1209 | goto out_bh; |
1210 | /* |
1211 | * Mark filesystem read-only if we have a partition with |
1212 | * virtual map since we don't handle writing to it (we |
1213 | * overwrite blocks instead of relocating them). |
1214 | */ |
1215 | sb->s_flags |= MS_RDONLY; |
1216 | printk(KERN_NOTICE "UDF-fs: Filesystem marked read-only " |
1217 | "because writing to pseudooverwrite partition is " |
1218 | "not implemented.\n"); |
1219 | } |
1220 | out_bh: |
1221 | /* In case loading failed, we handle cleanup in udf_fill_super */ |
1222 | brelse(bh); |
1223 | return ret; |
1224 | } |
1225 | |
1226 | static int udf_load_logicalvol(struct super_block *sb, sector_t block, |
1227 | struct kernel_lb_addr *fileset) |
1228 | { |
1229 | struct logicalVolDesc *lvd; |
1230 | int i, j, offset; |
1231 | uint8_t type; |
1232 | struct udf_sb_info *sbi = UDF_SB(sb); |
1233 | struct genericPartitionMap *gpm; |
1234 | uint16_t ident; |
1235 | struct buffer_head *bh; |
1236 | int ret = 0; |
1237 | |
1238 | bh = udf_read_tagged(sb, block, block, &ident); |
1239 | if (!bh) |
1240 | return 1; |
1241 | BUG_ON(ident != TAG_IDENT_LVD); |
1242 | lvd = (struct logicalVolDesc *)bh->b_data; |
1243 | |
1244 | i = udf_sb_alloc_partition_maps(sb, le32_to_cpu(lvd->numPartitionMaps)); |
1245 | if (i != 0) { |
1246 | ret = i; |
1247 | goto out_bh; |
1248 | } |
1249 | |
1250 | for (i = 0, offset = 0; |
1251 | i < sbi->s_partitions && offset < le32_to_cpu(lvd->mapTableLength); |
1252 | i++, offset += gpm->partitionMapLength) { |
1253 | struct udf_part_map *map = &sbi->s_partmaps[i]; |
1254 | gpm = (struct genericPartitionMap *) |
1255 | &(lvd->partitionMaps[offset]); |
1256 | type = gpm->partitionMapType; |
1257 | if (type == 1) { |
1258 | struct genericPartitionMap1 *gpm1 = |
1259 | (struct genericPartitionMap1 *)gpm; |
1260 | map->s_partition_type = UDF_TYPE1_MAP15; |
1261 | map->s_volumeseqnum = le16_to_cpu(gpm1->volSeqNum); |
1262 | map->s_partition_num = le16_to_cpu(gpm1->partitionNum); |
1263 | map->s_partition_func = NULL; |
1264 | } else if (type == 2) { |
1265 | struct udfPartitionMap2 *upm2 = |
1266 | (struct udfPartitionMap2 *)gpm; |
1267 | if (!strncmp(upm2->partIdent.ident, UDF_ID_VIRTUAL, |
1268 | strlen(UDF_ID_VIRTUAL))) { |
1269 | u16 suf = |
1270 | le16_to_cpu(((__le16 *)upm2->partIdent. |
1271 | identSuffix)[0]); |
1272 | if (suf < 0x0200) { |
1273 | map->s_partition_type = |
1274 | UDF_VIRTUAL_MAP15; |
1275 | map->s_partition_func = |
1276 | udf_get_pblock_virt15; |
1277 | } else { |
1278 | map->s_partition_type = |
1279 | UDF_VIRTUAL_MAP20; |
1280 | map->s_partition_func = |
1281 | udf_get_pblock_virt20; |
1282 | } |
1283 | } else if (!strncmp(upm2->partIdent.ident, |
1284 | UDF_ID_SPARABLE, |
1285 | strlen(UDF_ID_SPARABLE))) { |
1286 | uint32_t loc; |
1287 | struct sparingTable *st; |
1288 | struct sparablePartitionMap *spm = |
1289 | (struct sparablePartitionMap *)gpm; |
1290 | |
1291 | map->s_partition_type = UDF_SPARABLE_MAP15; |
1292 | map->s_type_specific.s_sparing.s_packet_len = |
1293 | le16_to_cpu(spm->packetLength); |
1294 | for (j = 0; j < spm->numSparingTables; j++) { |
1295 | struct buffer_head *bh2; |
1296 | |
1297 | loc = le32_to_cpu( |
1298 | spm->locSparingTable[j]); |
1299 | bh2 = udf_read_tagged(sb, loc, loc, |
1300 | &ident); |
1301 | map->s_type_specific.s_sparing. |
1302 | s_spar_map[j] = bh2; |
1303 | |
1304 | if (bh2 == NULL) |
1305 | continue; |
1306 | |
1307 | st = (struct sparingTable *)bh2->b_data; |
1308 | if (ident != 0 || strncmp( |
1309 | st->sparingIdent.ident, |
1310 | UDF_ID_SPARING, |
1311 | strlen(UDF_ID_SPARING))) { |
1312 | brelse(bh2); |
1313 | map->s_type_specific.s_sparing. |
1314 | s_spar_map[j] = NULL; |
1315 | } |
1316 | } |
1317 | map->s_partition_func = udf_get_pblock_spar15; |
1318 | } else if (!strncmp(upm2->partIdent.ident, |
1319 | UDF_ID_METADATA, |
1320 | strlen(UDF_ID_METADATA))) { |
1321 | struct udf_meta_data *mdata = |
1322 | &map->s_type_specific.s_metadata; |
1323 | struct metadataPartitionMap *mdm = |
1324 | (struct metadataPartitionMap *) |
1325 | &(lvd->partitionMaps[offset]); |
1326 | udf_debug("Parsing Logical vol part %d " |
1327 | "type %d id=%s\n", i, type, |
1328 | UDF_ID_METADATA); |
1329 | |
1330 | map->s_partition_type = UDF_METADATA_MAP25; |
1331 | map->s_partition_func = udf_get_pblock_meta25; |
1332 | |
1333 | mdata->s_meta_file_loc = |
1334 | le32_to_cpu(mdm->metadataFileLoc); |
1335 | mdata->s_mirror_file_loc = |
1336 | le32_to_cpu(mdm->metadataMirrorFileLoc); |
1337 | mdata->s_bitmap_file_loc = |
1338 | le32_to_cpu(mdm->metadataBitmapFileLoc); |
1339 | mdata->s_alloc_unit_size = |
1340 | le32_to_cpu(mdm->allocUnitSize); |
1341 | mdata->s_align_unit_size = |
1342 | le16_to_cpu(mdm->alignUnitSize); |
1343 | mdata->s_dup_md_flag = |
1344 | mdm->flags & 0x01; |
1345 | |
1346 | udf_debug("Metadata Ident suffix=0x%x\n", |
1347 | (le16_to_cpu( |
1348 | ((__le16 *) |
1349 | mdm->partIdent.identSuffix)[0]))); |
1350 | udf_debug("Metadata part num=%d\n", |
1351 | le16_to_cpu(mdm->partitionNum)); |
1352 | udf_debug("Metadata part alloc unit size=%d\n", |
1353 | le32_to_cpu(mdm->allocUnitSize)); |
1354 | udf_debug("Metadata file loc=%d\n", |
1355 | le32_to_cpu(mdm->metadataFileLoc)); |
1356 | udf_debug("Mirror file loc=%d\n", |
1357 | le32_to_cpu(mdm->metadataMirrorFileLoc)); |
1358 | udf_debug("Bitmap file loc=%d\n", |
1359 | le32_to_cpu(mdm->metadataBitmapFileLoc)); |
1360 | udf_debug("Duplicate Flag: %d %d\n", |
1361 | mdata->s_dup_md_flag, mdm->flags); |
1362 | } else { |
1363 | udf_debug("Unknown ident: %s\n", |
1364 | upm2->partIdent.ident); |
1365 | continue; |
1366 | } |
1367 | map->s_volumeseqnum = le16_to_cpu(upm2->volSeqNum); |
1368 | map->s_partition_num = le16_to_cpu(upm2->partitionNum); |
1369 | } |
1370 | udf_debug("Partition (%d:%d) type %d on volume %d\n", |
1371 | i, map->s_partition_num, type, |
1372 | map->s_volumeseqnum); |
1373 | } |
1374 | |
1375 | if (fileset) { |
1376 | struct long_ad *la = (struct long_ad *)&(lvd->logicalVolContentsUse[0]); |
1377 | |
1378 | *fileset = lelb_to_cpu(la->extLocation); |
1379 | udf_debug("FileSet found in LogicalVolDesc at block=%d, " |
1380 | "partition=%d\n", fileset->logicalBlockNum, |
1381 | fileset->partitionReferenceNum); |
1382 | } |
1383 | if (lvd->integritySeqExt.extLength) |
1384 | udf_load_logicalvolint(sb, leea_to_cpu(lvd->integritySeqExt)); |
1385 | |
1386 | out_bh: |
1387 | brelse(bh); |
1388 | return ret; |
1389 | } |
1390 | |
1391 | /* |
1392 | * udf_load_logicalvolint |
1393 | * |
1394 | */ |
1395 | static void udf_load_logicalvolint(struct super_block *sb, struct kernel_extent_ad loc) |
1396 | { |
1397 | struct buffer_head *bh = NULL; |
1398 | uint16_t ident; |
1399 | struct udf_sb_info *sbi = UDF_SB(sb); |
1400 | struct logicalVolIntegrityDesc *lvid; |
1401 | |
1402 | while (loc.extLength > 0 && |
1403 | (bh = udf_read_tagged(sb, loc.extLocation, |
1404 | loc.extLocation, &ident)) && |
1405 | ident == TAG_IDENT_LVID) { |
1406 | sbi->s_lvid_bh = bh; |
1407 | lvid = (struct logicalVolIntegrityDesc *)bh->b_data; |
1408 | |
1409 | if (lvid->nextIntegrityExt.extLength) |
1410 | udf_load_logicalvolint(sb, |
1411 | leea_to_cpu(lvid->nextIntegrityExt)); |
1412 | |
1413 | if (sbi->s_lvid_bh != bh) |
1414 | brelse(bh); |
1415 | loc.extLength -= sb->s_blocksize; |
1416 | loc.extLocation++; |
1417 | } |
1418 | if (sbi->s_lvid_bh != bh) |
1419 | brelse(bh); |
1420 | } |
1421 | |
1422 | /* |
1423 | * udf_process_sequence |
1424 | * |
1425 | * PURPOSE |
1426 | * Process a main/reserve volume descriptor sequence. |
1427 | * |
1428 | * PRE-CONDITIONS |
1429 | * sb Pointer to _locked_ superblock. |
1430 | * block First block of first extent of the sequence. |
1431 | * lastblock Lastblock of first extent of the sequence. |
1432 | * |
1433 | * HISTORY |
1434 | * July 1, 1997 - Andrew E. Mileski |
1435 | * Written, tested, and released. |
1436 | */ |
1437 | static noinline int udf_process_sequence(struct super_block *sb, long block, |
1438 | long lastblock, struct kernel_lb_addr *fileset) |
1439 | { |
1440 | struct buffer_head *bh = NULL; |
1441 | struct udf_vds_record vds[VDS_POS_LENGTH]; |
1442 | struct udf_vds_record *curr; |
1443 | struct generic_desc *gd; |
1444 | struct volDescPtr *vdp; |
1445 | int done = 0; |
1446 | uint32_t vdsn; |
1447 | uint16_t ident; |
1448 | long next_s = 0, next_e = 0; |
1449 | |
1450 | memset(vds, 0, sizeof(struct udf_vds_record) * VDS_POS_LENGTH); |
1451 | |
1452 | /* |
1453 | * Read the main descriptor sequence and find which descriptors |
1454 | * are in it. |
1455 | */ |
1456 | for (; (!done && block <= lastblock); block++) { |
1457 | |
1458 | bh = udf_read_tagged(sb, block, block, &ident); |
1459 | if (!bh) { |
1460 | printk(KERN_ERR "udf: Block %Lu of volume descriptor " |
1461 | "sequence is corrupted or we could not read " |
1462 | "it.\n", (unsigned long long)block); |
1463 | return 1; |
1464 | } |
1465 | |
1466 | /* Process each descriptor (ISO 13346 3/8.3-8.4) */ |
1467 | gd = (struct generic_desc *)bh->b_data; |
1468 | vdsn = le32_to_cpu(gd->volDescSeqNum); |
1469 | switch (ident) { |
1470 | case TAG_IDENT_PVD: /* ISO 13346 3/10.1 */ |
1471 | curr = &vds[VDS_POS_PRIMARY_VOL_DESC]; |
1472 | if (vdsn >= curr->volDescSeqNum) { |
1473 | curr->volDescSeqNum = vdsn; |
1474 | curr->block = block; |
1475 | } |
1476 | break; |
1477 | case TAG_IDENT_VDP: /* ISO 13346 3/10.3 */ |
1478 | curr = &vds[VDS_POS_VOL_DESC_PTR]; |
1479 | if (vdsn >= curr->volDescSeqNum) { |
1480 | curr->volDescSeqNum = vdsn; |
1481 | curr->block = block; |
1482 | |
1483 | vdp = (struct volDescPtr *)bh->b_data; |
1484 | next_s = le32_to_cpu( |
1485 | vdp->nextVolDescSeqExt.extLocation); |
1486 | next_e = le32_to_cpu( |
1487 | vdp->nextVolDescSeqExt.extLength); |
1488 | next_e = next_e >> sb->s_blocksize_bits; |
1489 | next_e += next_s; |
1490 | } |
1491 | break; |
1492 | case TAG_IDENT_IUVD: /* ISO 13346 3/10.4 */ |
1493 | curr = &vds[VDS_POS_IMP_USE_VOL_DESC]; |
1494 | if (vdsn >= curr->volDescSeqNum) { |
1495 | curr->volDescSeqNum = vdsn; |
1496 | curr->block = block; |
1497 | } |
1498 | break; |
1499 | case TAG_IDENT_PD: /* ISO 13346 3/10.5 */ |
1500 | curr = &vds[VDS_POS_PARTITION_DESC]; |
1501 | if (!curr->block) |
1502 | curr->block = block; |
1503 | break; |
1504 | case TAG_IDENT_LVD: /* ISO 13346 3/10.6 */ |
1505 | curr = &vds[VDS_POS_LOGICAL_VOL_DESC]; |
1506 | if (vdsn >= curr->volDescSeqNum) { |
1507 | curr->volDescSeqNum = vdsn; |
1508 | curr->block = block; |
1509 | } |
1510 | break; |
1511 | case TAG_IDENT_USD: /* ISO 13346 3/10.8 */ |
1512 | curr = &vds[VDS_POS_UNALLOC_SPACE_DESC]; |
1513 | if (vdsn >= curr->volDescSeqNum) { |
1514 | curr->volDescSeqNum = vdsn; |
1515 | curr->block = block; |
1516 | } |
1517 | break; |
1518 | case TAG_IDENT_TD: /* ISO 13346 3/10.9 */ |
1519 | vds[VDS_POS_TERMINATING_DESC].block = block; |
1520 | if (next_e) { |
1521 | block = next_s; |
1522 | lastblock = next_e; |
1523 | next_s = next_e = 0; |
1524 | } else |
1525 | done = 1; |
1526 | break; |
1527 | } |
1528 | brelse(bh); |
1529 | } |
1530 | /* |
1531 | * Now read interesting descriptors again and process them |
1532 | * in a suitable order |
1533 | */ |
1534 | if (!vds[VDS_POS_PRIMARY_VOL_DESC].block) { |
1535 | printk(KERN_ERR "udf: Primary Volume Descriptor not found!\n"); |
1536 | return 1; |
1537 | } |
1538 | if (udf_load_pvoldesc(sb, vds[VDS_POS_PRIMARY_VOL_DESC].block)) |
1539 | return 1; |
1540 | |
1541 | if (vds[VDS_POS_LOGICAL_VOL_DESC].block && udf_load_logicalvol(sb, |
1542 | vds[VDS_POS_LOGICAL_VOL_DESC].block, fileset)) |
1543 | return 1; |
1544 | |
1545 | if (vds[VDS_POS_PARTITION_DESC].block) { |
1546 | /* |
1547 | * We rescan the whole descriptor sequence to find |
1548 | * partition descriptor blocks and process them. |
1549 | */ |
1550 | for (block = vds[VDS_POS_PARTITION_DESC].block; |
1551 | block < vds[VDS_POS_TERMINATING_DESC].block; |
1552 | block++) |
1553 | if (udf_load_partdesc(sb, block)) |
1554 | return 1; |
1555 | } |
1556 | |
1557 | return 0; |
1558 | } |
1559 | |
1560 | static int udf_load_sequence(struct super_block *sb, struct buffer_head *bh, |
1561 | struct kernel_lb_addr *fileset) |
1562 | { |
1563 | struct anchorVolDescPtr *anchor; |
1564 | long main_s, main_e, reserve_s, reserve_e; |
1565 | struct udf_sb_info *sbi; |
1566 | |
1567 | sbi = UDF_SB(sb); |
1568 | anchor = (struct anchorVolDescPtr *)bh->b_data; |
1569 | |
1570 | /* Locate the main sequence */ |
1571 | main_s = le32_to_cpu(anchor->mainVolDescSeqExt.extLocation); |
1572 | main_e = le32_to_cpu(anchor->mainVolDescSeqExt.extLength); |
1573 | main_e = main_e >> sb->s_blocksize_bits; |
1574 | main_e += main_s; |
1575 | |
1576 | /* Locate the reserve sequence */ |
1577 | reserve_s = le32_to_cpu(anchor->reserveVolDescSeqExt.extLocation); |
1578 | reserve_e = le32_to_cpu(anchor->reserveVolDescSeqExt.extLength); |
1579 | reserve_e = reserve_e >> sb->s_blocksize_bits; |
1580 | reserve_e += reserve_s; |
1581 | |
1582 | /* Process the main & reserve sequences */ |
1583 | /* responsible for finding the PartitionDesc(s) */ |
1584 | if (!udf_process_sequence(sb, main_s, main_e, fileset)) |
1585 | return 1; |
1586 | return !udf_process_sequence(sb, reserve_s, reserve_e, fileset); |
1587 | } |
1588 | |
1589 | /* |
1590 | * Check whether there is an anchor block in the given block and |
1591 | * load Volume Descriptor Sequence if so. |
1592 | */ |
1593 | static int udf_check_anchor_block(struct super_block *sb, sector_t block, |
1594 | struct kernel_lb_addr *fileset) |
1595 | { |
1596 | struct buffer_head *bh; |
1597 | uint16_t ident; |
1598 | int ret; |
1599 | |
1600 | if (UDF_QUERY_FLAG(sb, UDF_FLAG_VARCONV) && |
1601 | udf_fixed_to_variable(block) >= |
1602 | sb->s_bdev->bd_inode->i_size >> sb->s_blocksize_bits) |
1603 | return 0; |
1604 | |
1605 | bh = udf_read_tagged(sb, block, block, &ident); |
1606 | if (!bh) |
1607 | return 0; |
1608 | if (ident != TAG_IDENT_AVDP) { |
1609 | brelse(bh); |
1610 | return 0; |
1611 | } |
1612 | ret = udf_load_sequence(sb, bh, fileset); |
1613 | brelse(bh); |
1614 | return ret; |
1615 | } |
1616 | |
1617 | /* Search for an anchor volume descriptor pointer */ |
1618 | static sector_t udf_scan_anchors(struct super_block *sb, sector_t lastblock, |
1619 | struct kernel_lb_addr *fileset) |
1620 | { |
1621 | sector_t last[6]; |
1622 | int i; |
1623 | struct udf_sb_info *sbi = UDF_SB(sb); |
1624 | int last_count = 0; |
1625 | |
1626 | /* First try user provided anchor */ |
1627 | if (sbi->s_anchor) { |
1628 | if (udf_check_anchor_block(sb, sbi->s_anchor, fileset)) |
1629 | return lastblock; |
1630 | } |
1631 | /* |
1632 | * according to spec, anchor is in either: |
1633 | * block 256 |
1634 | * lastblock-256 |
1635 | * lastblock |
1636 | * however, if the disc isn't closed, it could be 512. |
1637 | */ |
1638 | if (udf_check_anchor_block(sb, sbi->s_session + 256, fileset)) |
1639 | return lastblock; |
1640 | /* |
1641 | * The trouble is which block is the last one. Drives often misreport |
1642 | * this so we try various possibilities. |
1643 | */ |
1644 | last[last_count++] = lastblock; |
1645 | if (lastblock >= 1) |
1646 | last[last_count++] = lastblock - 1; |
1647 | last[last_count++] = lastblock + 1; |
1648 | if (lastblock >= 2) |
1649 | last[last_count++] = lastblock - 2; |
1650 | if (lastblock >= 150) |
1651 | last[last_count++] = lastblock - 150; |
1652 | if (lastblock >= 152) |
1653 | last[last_count++] = lastblock - 152; |
1654 | |
1655 | for (i = 0; i < last_count; i++) { |
1656 | if (last[i] >= sb->s_bdev->bd_inode->i_size >> |
1657 | sb->s_blocksize_bits) |
1658 | continue; |
1659 | if (udf_check_anchor_block(sb, last[i], fileset)) |
1660 | return last[i]; |
1661 | if (last[i] < 256) |
1662 | continue; |
1663 | if (udf_check_anchor_block(sb, last[i] - 256, fileset)) |
1664 | return last[i]; |
1665 | } |
1666 | |
1667 | /* Finally try block 512 in case media is open */ |
1668 | if (udf_check_anchor_block(sb, sbi->s_session + 512, fileset)) |
1669 | return last[0]; |
1670 | return 0; |
1671 | } |
1672 | |
1673 | /* |
1674 | * Find an anchor volume descriptor and load Volume Descriptor Sequence from |
1675 | * area specified by it. The function expects sbi->s_lastblock to be the last |
1676 | * block on the media. |
1677 | * |
1678 | * Return 1 if ok, 0 if not found. |
1679 | * |
1680 | */ |
1681 | static int udf_find_anchor(struct super_block *sb, |
1682 | struct kernel_lb_addr *fileset) |
1683 | { |
1684 | sector_t lastblock; |
1685 | struct udf_sb_info *sbi = UDF_SB(sb); |
1686 | |
1687 | lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset); |
1688 | if (lastblock) |
1689 | goto out; |
1690 | |
1691 | /* No anchor found? Try VARCONV conversion of block numbers */ |
1692 | UDF_SET_FLAG(sb, UDF_FLAG_VARCONV); |
1693 | /* Firstly, we try to not convert number of the last block */ |
1694 | lastblock = udf_scan_anchors(sb, |
1695 | udf_variable_to_fixed(sbi->s_last_block), |
1696 | fileset); |
1697 | if (lastblock) |
1698 | goto out; |
1699 | |
1700 | /* Secondly, we try with converted number of the last block */ |
1701 | lastblock = udf_scan_anchors(sb, sbi->s_last_block, fileset); |
1702 | if (!lastblock) { |
1703 | /* VARCONV didn't help. Clear it. */ |
1704 | UDF_CLEAR_FLAG(sb, UDF_FLAG_VARCONV); |
1705 | return 0; |
1706 | } |
1707 | out: |
1708 | sbi->s_last_block = lastblock; |
1709 | return 1; |
1710 | } |
1711 | |
1712 | /* |
1713 | * Check Volume Structure Descriptor, find Anchor block and load Volume |
1714 | * Descriptor Sequence |
1715 | */ |
1716 | static int udf_load_vrs(struct super_block *sb, struct udf_options *uopt, |
1717 | int silent, struct kernel_lb_addr *fileset) |
1718 | { |
1719 | struct udf_sb_info *sbi = UDF_SB(sb); |
1720 | loff_t nsr_off; |
1721 | |
1722 | if (!sb_set_blocksize(sb, uopt->blocksize)) { |
1723 | if (!silent) |
1724 | printk(KERN_WARNING "UDF-fs: Bad block size\n"); |
1725 | return 0; |
1726 | } |
1727 | sbi->s_last_block = uopt->lastblock; |
1728 | if (!uopt->novrs) { |
1729 | /* Check that it is NSR02 compliant */ |
1730 | nsr_off = udf_check_vsd(sb); |
1731 | if (!nsr_off) { |
1732 | if (!silent) |
1733 | printk(KERN_WARNING "UDF-fs: No VRS found\n"); |
1734 | return 0; |
1735 | } |
1736 | if (nsr_off == -1) |
1737 | udf_debug("Failed to read byte 32768. Assuming open " |
1738 | "disc. Skipping validity check\n"); |
1739 | if (!sbi->s_last_block) |
1740 | sbi->s_last_block = udf_get_last_block(sb); |
1741 | } else { |
1742 | udf_debug("Validity check skipped because of novrs option\n"); |
1743 | } |
1744 | |
1745 | /* Look for anchor block and load Volume Descriptor Sequence */ |
1746 | sbi->s_anchor = uopt->anchor; |
1747 | if (!udf_find_anchor(sb, fileset)) { |
1748 | if (!silent) |
1749 | printk(KERN_WARNING "UDF-fs: No anchor found\n"); |
1750 | return 0; |
1751 | } |
1752 | return 1; |
1753 | } |
1754 | |
1755 | static void udf_open_lvid(struct super_block *sb) |
1756 | { |
1757 | struct udf_sb_info *sbi = UDF_SB(sb); |
1758 | struct buffer_head *bh = sbi->s_lvid_bh; |
1759 | struct logicalVolIntegrityDesc *lvid; |
1760 | struct logicalVolIntegrityDescImpUse *lvidiu; |
1761 | |
1762 | if (!bh) |
1763 | return; |
1764 | lvid = (struct logicalVolIntegrityDesc *)bh->b_data; |
1765 | lvidiu = udf_sb_lvidiu(sbi); |
1766 | |
1767 | lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX; |
1768 | lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX; |
1769 | udf_time_to_disk_stamp(&lvid->recordingDateAndTime, |
1770 | CURRENT_TIME); |
1771 | lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN); |
1772 | |
1773 | lvid->descTag.descCRC = cpu_to_le16( |
1774 | crc_itu_t(0, (char *)lvid + sizeof(struct tag), |
1775 | le16_to_cpu(lvid->descTag.descCRCLength))); |
1776 | |
1777 | lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag); |
1778 | mark_buffer_dirty(bh); |
1779 | sbi->s_lvid_dirty = 0; |
1780 | } |
1781 | |
1782 | static void udf_close_lvid(struct super_block *sb) |
1783 | { |
1784 | struct udf_sb_info *sbi = UDF_SB(sb); |
1785 | struct buffer_head *bh = sbi->s_lvid_bh; |
1786 | struct logicalVolIntegrityDesc *lvid; |
1787 | struct logicalVolIntegrityDescImpUse *lvidiu; |
1788 | |
1789 | if (!bh) |
1790 | return; |
1791 | |
1792 | lvid = (struct logicalVolIntegrityDesc *)bh->b_data; |
1793 | lvidiu = udf_sb_lvidiu(sbi); |
1794 | lvidiu->impIdent.identSuffix[0] = UDF_OS_CLASS_UNIX; |
1795 | lvidiu->impIdent.identSuffix[1] = UDF_OS_ID_LINUX; |
1796 | udf_time_to_disk_stamp(&lvid->recordingDateAndTime, CURRENT_TIME); |
1797 | if (UDF_MAX_WRITE_VERSION > le16_to_cpu(lvidiu->maxUDFWriteRev)) |
1798 | lvidiu->maxUDFWriteRev = cpu_to_le16(UDF_MAX_WRITE_VERSION); |
1799 | if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFReadRev)) |
1800 | lvidiu->minUDFReadRev = cpu_to_le16(sbi->s_udfrev); |
1801 | if (sbi->s_udfrev > le16_to_cpu(lvidiu->minUDFWriteRev)) |
1802 | lvidiu->minUDFWriteRev = cpu_to_le16(sbi->s_udfrev); |
1803 | lvid->integrityType = cpu_to_le32(LVID_INTEGRITY_TYPE_CLOSE); |
1804 | |
1805 | lvid->descTag.descCRC = cpu_to_le16( |
1806 | crc_itu_t(0, (char *)lvid + sizeof(struct tag), |
1807 | le16_to_cpu(lvid->descTag.descCRCLength))); |
1808 | |
1809 | lvid->descTag.tagChecksum = udf_tag_checksum(&lvid->descTag); |
1810 | mark_buffer_dirty(bh); |
1811 | sbi->s_lvid_dirty = 0; |
1812 | } |
1813 | |
1814 | static void udf_sb_free_bitmap(struct udf_bitmap *bitmap) |
1815 | { |
1816 | int i; |
1817 | int nr_groups = bitmap->s_nr_groups; |
1818 | int size = sizeof(struct udf_bitmap) + (sizeof(struct buffer_head *) * |
1819 | nr_groups); |
1820 | |
1821 | for (i = 0; i < nr_groups; i++) |
1822 | if (bitmap->s_block_bitmap[i]) |
1823 | brelse(bitmap->s_block_bitmap[i]); |
1824 | |
1825 | if (size <= PAGE_SIZE) |
1826 | kfree(bitmap); |
1827 | else |
1828 | vfree(bitmap); |
1829 | } |
1830 | |
1831 | static void udf_free_partition(struct udf_part_map *map) |
1832 | { |
1833 | int i; |
1834 | struct udf_meta_data *mdata; |
1835 | |
1836 | if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) |
1837 | iput(map->s_uspace.s_table); |
1838 | if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) |
1839 | iput(map->s_fspace.s_table); |
1840 | if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) |
1841 | udf_sb_free_bitmap(map->s_uspace.s_bitmap); |
1842 | if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) |
1843 | udf_sb_free_bitmap(map->s_fspace.s_bitmap); |
1844 | if (map->s_partition_type == UDF_SPARABLE_MAP15) |
1845 | for (i = 0; i < 4; i++) |
1846 | brelse(map->s_type_specific.s_sparing.s_spar_map[i]); |
1847 | else if (map->s_partition_type == UDF_METADATA_MAP25) { |
1848 | mdata = &map->s_type_specific.s_metadata; |
1849 | iput(mdata->s_metadata_fe); |
1850 | mdata->s_metadata_fe = NULL; |
1851 | |
1852 | iput(mdata->s_mirror_fe); |
1853 | mdata->s_mirror_fe = NULL; |
1854 | |
1855 | iput(mdata->s_bitmap_fe); |
1856 | mdata->s_bitmap_fe = NULL; |
1857 | } |
1858 | } |
1859 | |
1860 | static int udf_fill_super(struct super_block *sb, void *options, int silent) |
1861 | { |
1862 | int i; |
1863 | int ret; |
1864 | struct inode *inode = NULL; |
1865 | struct udf_options uopt; |
1866 | struct kernel_lb_addr rootdir, fileset; |
1867 | struct udf_sb_info *sbi; |
1868 | |
1869 | uopt.flags = (1 << UDF_FLAG_USE_AD_IN_ICB) | (1 << UDF_FLAG_STRICT); |
1870 | uopt.uid = -1; |
1871 | uopt.gid = -1; |
1872 | uopt.umask = 0; |
1873 | uopt.fmode = UDF_INVALID_MODE; |
1874 | uopt.dmode = UDF_INVALID_MODE; |
1875 | |
1876 | sbi = kzalloc(sizeof(struct udf_sb_info), GFP_KERNEL); |
1877 | if (!sbi) |
1878 | return -ENOMEM; |
1879 | |
1880 | sb->s_fs_info = sbi; |
1881 | |
1882 | mutex_init(&sbi->s_alloc_mutex); |
1883 | |
1884 | if (!udf_parse_options((char *)options, &uopt, false)) |
1885 | goto error_out; |
1886 | |
1887 | if (uopt.flags & (1 << UDF_FLAG_UTF8) && |
1888 | uopt.flags & (1 << UDF_FLAG_NLS_MAP)) { |
1889 | udf_error(sb, "udf_read_super", |
1890 | "utf8 cannot be combined with iocharset\n"); |
1891 | goto error_out; |
1892 | } |
1893 | #ifdef CONFIG_UDF_NLS |
1894 | if ((uopt.flags & (1 << UDF_FLAG_NLS_MAP)) && !uopt.nls_map) { |
1895 | uopt.nls_map = load_nls_default(); |
1896 | if (!uopt.nls_map) |
1897 | uopt.flags &= ~(1 << UDF_FLAG_NLS_MAP); |
1898 | else |
1899 | udf_debug("Using default NLS map\n"); |
1900 | } |
1901 | #endif |
1902 | if (!(uopt.flags & (1 << UDF_FLAG_NLS_MAP))) |
1903 | uopt.flags |= (1 << UDF_FLAG_UTF8); |
1904 | |
1905 | fileset.logicalBlockNum = 0xFFFFFFFF; |
1906 | fileset.partitionReferenceNum = 0xFFFF; |
1907 | |
1908 | sbi->s_flags = uopt.flags; |
1909 | sbi->s_uid = uopt.uid; |
1910 | sbi->s_gid = uopt.gid; |
1911 | sbi->s_umask = uopt.umask; |
1912 | sbi->s_fmode = uopt.fmode; |
1913 | sbi->s_dmode = uopt.dmode; |
1914 | sbi->s_nls_map = uopt.nls_map; |
1915 | |
1916 | if (uopt.session == 0xFFFFFFFF) |
1917 | sbi->s_session = udf_get_last_session(sb); |
1918 | else |
1919 | sbi->s_session = uopt.session; |
1920 | |
1921 | udf_debug("Multi-session=%d\n", sbi->s_session); |
1922 | |
1923 | /* Fill in the rest of the superblock */ |
1924 | sb->s_op = &udf_sb_ops; |
1925 | sb->s_export_op = &udf_export_ops; |
1926 | sb->dq_op = NULL; |
1927 | sb->s_dirt = 0; |
1928 | sb->s_magic = UDF_SUPER_MAGIC; |
1929 | sb->s_time_gran = 1000; |
1930 | |
1931 | if (uopt.flags & (1 << UDF_FLAG_BLOCKSIZE_SET)) { |
1932 | ret = udf_load_vrs(sb, &uopt, silent, &fileset); |
1933 | } else { |
1934 | uopt.blocksize = bdev_logical_block_size(sb->s_bdev); |
1935 | ret = udf_load_vrs(sb, &uopt, silent, &fileset); |
1936 | if (!ret && uopt.blocksize != UDF_DEFAULT_BLOCKSIZE) { |
1937 | if (!silent) |
1938 | printk(KERN_NOTICE |
1939 | "UDF-fs: Rescanning with blocksize " |
1940 | "%d\n", UDF_DEFAULT_BLOCKSIZE); |
1941 | uopt.blocksize = UDF_DEFAULT_BLOCKSIZE; |
1942 | ret = udf_load_vrs(sb, &uopt, silent, &fileset); |
1943 | } |
1944 | } |
1945 | if (!ret) { |
1946 | printk(KERN_WARNING "UDF-fs: No partition found (1)\n"); |
1947 | goto error_out; |
1948 | } |
1949 | |
1950 | udf_debug("Lastblock=%d\n", sbi->s_last_block); |
1951 | |
1952 | if (sbi->s_lvid_bh) { |
1953 | struct logicalVolIntegrityDescImpUse *lvidiu = |
1954 | udf_sb_lvidiu(sbi); |
1955 | uint16_t minUDFReadRev = le16_to_cpu(lvidiu->minUDFReadRev); |
1956 | uint16_t minUDFWriteRev = le16_to_cpu(lvidiu->minUDFWriteRev); |
1957 | /* uint16_t maxUDFWriteRev = |
1958 | le16_to_cpu(lvidiu->maxUDFWriteRev); */ |
1959 | |
1960 | if (minUDFReadRev > UDF_MAX_READ_VERSION) { |
1961 | printk(KERN_ERR "UDF-fs: minUDFReadRev=%x " |
1962 | "(max is %x)\n", |
1963 | le16_to_cpu(lvidiu->minUDFReadRev), |
1964 | UDF_MAX_READ_VERSION); |
1965 | goto error_out; |
1966 | } else if (minUDFWriteRev > UDF_MAX_WRITE_VERSION) |
1967 | sb->s_flags |= MS_RDONLY; |
1968 | |
1969 | sbi->s_udfrev = minUDFWriteRev; |
1970 | |
1971 | if (minUDFReadRev >= UDF_VERS_USE_EXTENDED_FE) |
1972 | UDF_SET_FLAG(sb, UDF_FLAG_USE_EXTENDED_FE); |
1973 | if (minUDFReadRev >= UDF_VERS_USE_STREAMS) |
1974 | UDF_SET_FLAG(sb, UDF_FLAG_USE_STREAMS); |
1975 | } |
1976 | |
1977 | if (!sbi->s_partitions) { |
1978 | printk(KERN_WARNING "UDF-fs: No partition found (2)\n"); |
1979 | goto error_out; |
1980 | } |
1981 | |
1982 | if (sbi->s_partmaps[sbi->s_partition].s_partition_flags & |
1983 | UDF_PART_FLAG_READ_ONLY) { |
1984 | printk(KERN_NOTICE "UDF-fs: Partition marked readonly; " |
1985 | "forcing readonly mount\n"); |
1986 | sb->s_flags |= MS_RDONLY; |
1987 | } |
1988 | |
1989 | if (udf_find_fileset(sb, &fileset, &rootdir)) { |
1990 | printk(KERN_WARNING "UDF-fs: No fileset found\n"); |
1991 | goto error_out; |
1992 | } |
1993 | |
1994 | if (!silent) { |
1995 | struct timestamp ts; |
1996 | udf_time_to_disk_stamp(&ts, sbi->s_record_time); |
1997 | udf_info("UDF: Mounting volume '%s', " |
1998 | "timestamp %04u/%02u/%02u %02u:%02u (%x)\n", |
1999 | sbi->s_volume_ident, le16_to_cpu(ts.year), ts.month, ts.day, |
2000 | ts.hour, ts.minute, le16_to_cpu(ts.typeAndTimezone)); |
2001 | } |
2002 | if (!(sb->s_flags & MS_RDONLY)) |
2003 | udf_open_lvid(sb); |
2004 | |
2005 | /* Assign the root inode */ |
2006 | /* assign inodes by physical block number */ |
2007 | /* perhaps it's not extensible enough, but for now ... */ |
2008 | inode = udf_iget(sb, &rootdir); |
2009 | if (!inode) { |
2010 | printk(KERN_ERR "UDF-fs: Error in udf_iget, block=%d, " |
2011 | "partition=%d\n", |
2012 | rootdir.logicalBlockNum, rootdir.partitionReferenceNum); |
2013 | goto error_out; |
2014 | } |
2015 | |
2016 | /* Allocate a dentry for the root inode */ |
2017 | sb->s_root = d_alloc_root(inode); |
2018 | if (!sb->s_root) { |
2019 | printk(KERN_ERR "UDF-fs: Couldn't allocate root dentry\n"); |
2020 | iput(inode); |
2021 | goto error_out; |
2022 | } |
2023 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
2024 | return 0; |
2025 | |
2026 | error_out: |
2027 | if (sbi->s_vat_inode) |
2028 | iput(sbi->s_vat_inode); |
2029 | if (sbi->s_partitions) |
2030 | for (i = 0; i < sbi->s_partitions; i++) |
2031 | udf_free_partition(&sbi->s_partmaps[i]); |
2032 | #ifdef CONFIG_UDF_NLS |
2033 | if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP)) |
2034 | unload_nls(sbi->s_nls_map); |
2035 | #endif |
2036 | if (!(sb->s_flags & MS_RDONLY)) |
2037 | udf_close_lvid(sb); |
2038 | brelse(sbi->s_lvid_bh); |
2039 | |
2040 | kfree(sbi->s_partmaps); |
2041 | kfree(sbi); |
2042 | sb->s_fs_info = NULL; |
2043 | |
2044 | return -EINVAL; |
2045 | } |
2046 | |
2047 | static void udf_error(struct super_block *sb, const char *function, |
2048 | const char *fmt, ...) |
2049 | { |
2050 | va_list args; |
2051 | |
2052 | if (!(sb->s_flags & MS_RDONLY)) { |
2053 | /* mark sb error */ |
2054 | sb->s_dirt = 1; |
2055 | } |
2056 | va_start(args, fmt); |
2057 | vsnprintf(error_buf, sizeof(error_buf), fmt, args); |
2058 | va_end(args); |
2059 | printk(KERN_CRIT "UDF-fs error (device %s): %s: %s\n", |
2060 | sb->s_id, function, error_buf); |
2061 | } |
2062 | |
2063 | void udf_warning(struct super_block *sb, const char *function, |
2064 | const char *fmt, ...) |
2065 | { |
2066 | va_list args; |
2067 | |
2068 | va_start(args, fmt); |
2069 | vsnprintf(error_buf, sizeof(error_buf), fmt, args); |
2070 | va_end(args); |
2071 | printk(KERN_WARNING "UDF-fs warning (device %s): %s: %s\n", |
2072 | sb->s_id, function, error_buf); |
2073 | } |
2074 | |
2075 | static void udf_put_super(struct super_block *sb) |
2076 | { |
2077 | int i; |
2078 | struct udf_sb_info *sbi; |
2079 | |
2080 | sbi = UDF_SB(sb); |
2081 | |
2082 | lock_kernel(); |
2083 | |
2084 | if (sbi->s_vat_inode) |
2085 | iput(sbi->s_vat_inode); |
2086 | if (sbi->s_partitions) |
2087 | for (i = 0; i < sbi->s_partitions; i++) |
2088 | udf_free_partition(&sbi->s_partmaps[i]); |
2089 | #ifdef CONFIG_UDF_NLS |
2090 | if (UDF_QUERY_FLAG(sb, UDF_FLAG_NLS_MAP)) |
2091 | unload_nls(sbi->s_nls_map); |
2092 | #endif |
2093 | if (!(sb->s_flags & MS_RDONLY)) |
2094 | udf_close_lvid(sb); |
2095 | brelse(sbi->s_lvid_bh); |
2096 | kfree(sbi->s_partmaps); |
2097 | kfree(sb->s_fs_info); |
2098 | sb->s_fs_info = NULL; |
2099 | |
2100 | unlock_kernel(); |
2101 | } |
2102 | |
2103 | static int udf_sync_fs(struct super_block *sb, int wait) |
2104 | { |
2105 | struct udf_sb_info *sbi = UDF_SB(sb); |
2106 | |
2107 | mutex_lock(&sbi->s_alloc_mutex); |
2108 | if (sbi->s_lvid_dirty) { |
2109 | /* |
2110 | * Blockdevice will be synced later so we don't have to submit |
2111 | * the buffer for IO |
2112 | */ |
2113 | mark_buffer_dirty(sbi->s_lvid_bh); |
2114 | sb->s_dirt = 0; |
2115 | sbi->s_lvid_dirty = 0; |
2116 | } |
2117 | mutex_unlock(&sbi->s_alloc_mutex); |
2118 | |
2119 | return 0; |
2120 | } |
2121 | |
2122 | static int udf_statfs(struct dentry *dentry, struct kstatfs *buf) |
2123 | { |
2124 | struct super_block *sb = dentry->d_sb; |
2125 | struct udf_sb_info *sbi = UDF_SB(sb); |
2126 | struct logicalVolIntegrityDescImpUse *lvidiu; |
2127 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
2128 | |
2129 | if (sbi->s_lvid_bh != NULL) |
2130 | lvidiu = udf_sb_lvidiu(sbi); |
2131 | else |
2132 | lvidiu = NULL; |
2133 | |
2134 | buf->f_type = UDF_SUPER_MAGIC; |
2135 | buf->f_bsize = sb->s_blocksize; |
2136 | buf->f_blocks = sbi->s_partmaps[sbi->s_partition].s_partition_len; |
2137 | buf->f_bfree = udf_count_free(sb); |
2138 | buf->f_bavail = buf->f_bfree; |
2139 | buf->f_files = (lvidiu != NULL ? (le32_to_cpu(lvidiu->numFiles) + |
2140 | le32_to_cpu(lvidiu->numDirs)) : 0) |
2141 | + buf->f_bfree; |
2142 | buf->f_ffree = buf->f_bfree; |
2143 | buf->f_namelen = UDF_NAME_LEN - 2; |
2144 | buf->f_fsid.val[0] = (u32)id; |
2145 | buf->f_fsid.val[1] = (u32)(id >> 32); |
2146 | |
2147 | return 0; |
2148 | } |
2149 | |
2150 | static unsigned int udf_count_free_bitmap(struct super_block *sb, |
2151 | struct udf_bitmap *bitmap) |
2152 | { |
2153 | struct buffer_head *bh = NULL; |
2154 | unsigned int accum = 0; |
2155 | int index; |
2156 | int block = 0, newblock; |
2157 | struct kernel_lb_addr loc; |
2158 | uint32_t bytes; |
2159 | uint8_t *ptr; |
2160 | uint16_t ident; |
2161 | struct spaceBitmapDesc *bm; |
2162 | |
2163 | lock_kernel(); |
2164 | |
2165 | loc.logicalBlockNum = bitmap->s_extPosition; |
2166 | loc.partitionReferenceNum = UDF_SB(sb)->s_partition; |
2167 | bh = udf_read_ptagged(sb, &loc, 0, &ident); |
2168 | |
2169 | if (!bh) { |
2170 | printk(KERN_ERR "udf: udf_count_free failed\n"); |
2171 | goto out; |
2172 | } else if (ident != TAG_IDENT_SBD) { |
2173 | brelse(bh); |
2174 | printk(KERN_ERR "udf: udf_count_free failed\n"); |
2175 | goto out; |
2176 | } |
2177 | |
2178 | bm = (struct spaceBitmapDesc *)bh->b_data; |
2179 | bytes = le32_to_cpu(bm->numOfBytes); |
2180 | index = sizeof(struct spaceBitmapDesc); /* offset in first block only */ |
2181 | ptr = (uint8_t *)bh->b_data; |
2182 | |
2183 | while (bytes > 0) { |
2184 | u32 cur_bytes = min_t(u32, bytes, sb->s_blocksize - index); |
2185 | accum += bitmap_weight((const unsigned long *)(ptr + index), |
2186 | cur_bytes * 8); |
2187 | bytes -= cur_bytes; |
2188 | if (bytes) { |
2189 | brelse(bh); |
2190 | newblock = udf_get_lb_pblock(sb, &loc, ++block); |
2191 | bh = udf_tread(sb, newblock); |
2192 | if (!bh) { |
2193 | udf_debug("read failed\n"); |
2194 | goto out; |
2195 | } |
2196 | index = 0; |
2197 | ptr = (uint8_t *)bh->b_data; |
2198 | } |
2199 | } |
2200 | brelse(bh); |
2201 | |
2202 | out: |
2203 | unlock_kernel(); |
2204 | |
2205 | return accum; |
2206 | } |
2207 | |
2208 | static unsigned int udf_count_free_table(struct super_block *sb, |
2209 | struct inode *table) |
2210 | { |
2211 | unsigned int accum = 0; |
2212 | uint32_t elen; |
2213 | struct kernel_lb_addr eloc; |
2214 | int8_t etype; |
2215 | struct extent_position epos; |
2216 | |
2217 | lock_kernel(); |
2218 | |
2219 | epos.block = UDF_I(table)->i_location; |
2220 | epos.offset = sizeof(struct unallocSpaceEntry); |
2221 | epos.bh = NULL; |
2222 | |
2223 | while ((etype = udf_next_aext(table, &epos, &eloc, &elen, 1)) != -1) |
2224 | accum += (elen >> table->i_sb->s_blocksize_bits); |
2225 | |
2226 | brelse(epos.bh); |
2227 | |
2228 | unlock_kernel(); |
2229 | |
2230 | return accum; |
2231 | } |
2232 | |
2233 | static unsigned int udf_count_free(struct super_block *sb) |
2234 | { |
2235 | unsigned int accum = 0; |
2236 | struct udf_sb_info *sbi; |
2237 | struct udf_part_map *map; |
2238 | |
2239 | sbi = UDF_SB(sb); |
2240 | if (sbi->s_lvid_bh) { |
2241 | struct logicalVolIntegrityDesc *lvid = |
2242 | (struct logicalVolIntegrityDesc *) |
2243 | sbi->s_lvid_bh->b_data; |
2244 | if (le32_to_cpu(lvid->numOfPartitions) > sbi->s_partition) { |
2245 | accum = le32_to_cpu( |
2246 | lvid->freeSpaceTable[sbi->s_partition]); |
2247 | if (accum == 0xFFFFFFFF) |
2248 | accum = 0; |
2249 | } |
2250 | } |
2251 | |
2252 | if (accum) |
2253 | return accum; |
2254 | |
2255 | map = &sbi->s_partmaps[sbi->s_partition]; |
2256 | if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_BITMAP) { |
2257 | accum += udf_count_free_bitmap(sb, |
2258 | map->s_uspace.s_bitmap); |
2259 | } |
2260 | if (map->s_partition_flags & UDF_PART_FLAG_FREED_BITMAP) { |
2261 | accum += udf_count_free_bitmap(sb, |
2262 | map->s_fspace.s_bitmap); |
2263 | } |
2264 | if (accum) |
2265 | return accum; |
2266 | |
2267 | if (map->s_partition_flags & UDF_PART_FLAG_UNALLOC_TABLE) { |
2268 | accum += udf_count_free_table(sb, |
2269 | map->s_uspace.s_table); |
2270 | } |
2271 | if (map->s_partition_flags & UDF_PART_FLAG_FREED_TABLE) { |
2272 | accum += udf_count_free_table(sb, |
2273 | map->s_fspace.s_table); |
2274 | } |
2275 | |
2276 | return accum; |
2277 | } |
2278 |
Branches:
ben-wpan
ben-wpan-stefan
javiroman/ks7010
jz-2.6.34
jz-2.6.34-rc5
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jz47xx
jz47xx-2.6.38
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Tags:
od-2011-09-04
od-2011-09-18
v2.6.34-rc5
v2.6.34-rc6
v2.6.34-rc7
v3.9