blob: bcd2d41b318a49688f05068bd278145b16544465 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/isofs/inode.c
3 *
4 * (C) 1991 Linus Torvalds - minix filesystem
5 * 1992, 1993, 1994 Eric Youngdale Modified for ISO 9660 filesystem.
Jan Engelhardt96de0e22007-10-19 23:21:04 +02006 * 1994 Eberhard Mönkeberg - multi session handling.
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * 1995 Mark Dobie - allow mounting of some weird VideoCDs and PhotoCDs.
8 * 1997 Gordon Chaffee - Joliet CDs
9 * 1998 Eric Lammerts - ISO 9660 Level 3
10 * 2004 Paul Serice - Inode Support pushed out from 4GB to 128GB
11 * 2004 Paul Serice - NFS Export Operations
12 */
13
Al Viro94f2f7152005-04-25 18:32:12 -070014#include <linux/init.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/module.h>
16
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include <linux/nls.h>
19#include <linux/ctype.h>
Al Viro94f2f7152005-04-25 18:32:12 -070020#include <linux/statfs.h>
21#include <linux/cdrom.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/parser.h>
Namjae Jeon30690832011-11-02 13:38:00 -070023#include <linux/mpage.h>
Eric W. Biedermanba64e2b2012-02-10 11:35:50 -080024#include <linux/user_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025
Al Viro94f2f7152005-04-25 18:32:12 -070026#include "isofs.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include "zisofs.h"
28
29#define BEQUIET
30
Linus Torvaldsda53be12013-05-21 15:22:44 -070031static int isofs_hashi(const struct dentry *parent, struct qstr *qstr);
Nick Piggin621e1552011-01-07 17:49:27 +110032static int isofs_dentry_cmpi(const struct dentry *parent,
Linus Torvaldsda53be12013-05-21 15:22:44 -070033 const struct dentry *dentry,
Nick Piggin621e1552011-01-07 17:49:27 +110034 unsigned int len, const char *str, const struct qstr *name);
Linus Torvalds1da177e2005-04-16 15:20:36 -070035
36#ifdef CONFIG_JOLIET
Linus Torvaldsda53be12013-05-21 15:22:44 -070037static int isofs_hashi_ms(const struct dentry *parent, struct qstr *qstr);
38static int isofs_hash_ms(const struct dentry *parent, struct qstr *qstr);
Nick Piggin621e1552011-01-07 17:49:27 +110039static int isofs_dentry_cmpi_ms(const struct dentry *parent,
Linus Torvaldsda53be12013-05-21 15:22:44 -070040 const struct dentry *dentry,
Nick Piggin621e1552011-01-07 17:49:27 +110041 unsigned int len, const char *str, const struct qstr *name);
42static int isofs_dentry_cmp_ms(const struct dentry *parent,
Linus Torvaldsda53be12013-05-21 15:22:44 -070043 const struct dentry *dentry,
Nick Piggin621e1552011-01-07 17:49:27 +110044 unsigned int len, const char *str, const struct qstr *name);
Linus Torvalds1da177e2005-04-16 15:20:36 -070045#endif
46
47static void isofs_put_super(struct super_block *sb)
48{
49 struct isofs_sb_info *sbi = ISOFS_SB(sb);
Christoph Hellwig6cfd0142009-05-05 15:40:36 +020050
Linus Torvalds1da177e2005-04-16 15:20:36 -070051#ifdef CONFIG_JOLIET
Thomas Gleixner6d729e42009-08-16 21:05:08 +000052 unload_nls(sbi->s_nls_iocharset);
Linus Torvalds1da177e2005-04-16 15:20:36 -070053#endif
54
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 kfree(sbi);
56 sb->s_fs_info = NULL;
57 return;
58}
59
Jan Kara410dd3c2014-08-17 11:49:57 +020060static int isofs_read_inode(struct inode *, int relocated);
David Howells726c3342006-06-23 02:02:58 -070061static int isofs_statfs (struct dentry *, struct kstatfs *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070062
Christoph Lametere18b8902006-12-06 20:33:20 -080063static struct kmem_cache *isofs_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -070064
65static struct inode *isofs_alloc_inode(struct super_block *sb)
66{
67 struct iso_inode_info *ei;
Christoph Lametere94b1762006-12-06 20:33:17 -080068 ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 if (!ei)
70 return NULL;
71 return &ei->vfs_inode;
72}
73
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +110074static void isofs_i_callback(struct rcu_head *head)
75{
76 struct inode *inode = container_of(head, struct inode, i_rcu);
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +110077 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
78}
79
Linus Torvalds1da177e2005-04-16 15:20:36 -070080static void isofs_destroy_inode(struct inode *inode)
81{
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +110082 call_rcu(&inode->i_rcu, isofs_i_callback);
Linus Torvalds1da177e2005-04-16 15:20:36 -070083}
84
Alexey Dobriyan51cc5062008-07-25 19:45:34 -070085static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -070086{
Andrew Morton9eb7f2c2005-06-21 17:16:49 -070087 struct iso_inode_info *ei = foo;
Linus Torvalds1da177e2005-04-16 15:20:36 -070088
Christoph Lametera35afb82007-05-16 22:10:57 -070089 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070090}
Dave Jonesc3ed85a2007-07-15 23:40:03 -070091
Fabian Frederickb3b749b2014-03-10 22:01:48 +010092static int __init init_inodecache(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -070093{
94 isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
Dave Jonesc3ed85a2007-07-15 23:40:03 -070095 sizeof(struct iso_inode_info),
96 0, (SLAB_RECLAIM_ACCOUNT|
Vladimir Davydov5d097052016-01-14 15:18:21 -080097 SLAB_MEM_SPREAD|SLAB_ACCOUNT),
Paul Mundt20c2df82007-07-20 10:11:58 +090098 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 if (isofs_inode_cachep == NULL)
100 return -ENOMEM;
101 return 0;
102}
103
104static void destroy_inodecache(void)
105{
Kirill A. Shutemov8c0a8532012-09-26 11:33:07 +1000106 /*
107 * Make sure all delayed rcu free inodes are flushed before we
108 * destroy cache.
109 */
110 rcu_barrier();
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -0700111 kmem_cache_destroy(isofs_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112}
113
114static int isofs_remount(struct super_block *sb, int *flags, char *data)
115{
Theodore Ts'o02b99842014-03-13 10:14:33 -0400116 sync_filesystem(sb);
Jan Kara17b7f7c2013-07-25 11:49:11 +0200117 if (!(*flags & MS_RDONLY))
118 return -EROFS;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 return 0;
120}
121
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800122static const struct super_operations isofs_sops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123 .alloc_inode = isofs_alloc_inode,
124 .destroy_inode = isofs_destroy_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125 .put_super = isofs_put_super,
126 .statfs = isofs_statfs,
127 .remount_fs = isofs_remount,
Miklos Szeredid0132ee2008-02-08 04:21:46 -0800128 .show_options = generic_show_options,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129};
130
131
Al Viroe16404e2009-02-20 05:55:13 +0000132static const struct dentry_operations isofs_dentry_ops[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133 {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 .d_hash = isofs_hashi,
135 .d_compare = isofs_dentry_cmpi,
136 },
137#ifdef CONFIG_JOLIET
138 {
139 .d_hash = isofs_hash_ms,
140 .d_compare = isofs_dentry_cmp_ms,
141 },
142 {
143 .d_hash = isofs_hashi_ms,
144 .d_compare = isofs_dentry_cmpi_ms,
Andrew Morton9eb7f2c2005-06-21 17:16:49 -0700145 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146#endif
147};
148
149struct iso9660_options{
Jan Kara5404ac82009-06-17 16:26:27 -0700150 unsigned int rock:1;
Bartlomiej Zolnierkiewicz8711c672009-07-10 12:34:27 +0200151 unsigned int joliet:1;
Jan Kara5404ac82009-06-17 16:26:27 -0700152 unsigned int cruft:1;
153 unsigned int hide:1;
154 unsigned int showassoc:1;
155 unsigned int nocompress:1;
156 unsigned int overriderockperm:1;
157 unsigned int uid_set:1;
158 unsigned int gid_set:1;
159 unsigned int utf8:1;
160 unsigned char map;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 unsigned char check;
162 unsigned int blocksize;
Al Viro7328bdd2011-07-26 03:19:52 -0400163 umode_t fmode;
164 umode_t dmode;
Eric W. Biedermanba64e2b2012-02-10 11:35:50 -0800165 kgid_t gid;
166 kuid_t uid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 char *iocharset;
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700168 /* LVE */
169 s32 session;
170 s32 sbsector;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171};
172
173/*
174 * Compute the hash for the isofs name corresponding to the dentry.
175 */
176static int
Al Viro966c1f72013-09-29 18:09:05 -0400177isofs_hashi_common(struct qstr *qstr, int ms)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178{
179 const char *name;
180 int len;
181 char c;
182 unsigned long hash;
183
184 len = qstr->len;
185 name = qstr->name;
186 if (ms) {
187 while (len && name[len-1] == '.')
188 len--;
189 }
190
191 hash = init_name_hash();
192 while (len--) {
193 c = tolower(*name++);
young davef17e1212007-07-15 23:40:17 -0700194 hash = partial_name_hash(c, hash);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 }
196 qstr->hash = end_name_hash(hash);
197
198 return 0;
199}
200
201/*
Nick Piggin621e1552011-01-07 17:49:27 +1100202 * Compare of two isofs names.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 */
Nick Piggin621e1552011-01-07 17:49:27 +1100204static int isofs_dentry_cmp_common(
205 unsigned int len, const char *str,
206 const struct qstr *name, int ms, int ci)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207{
208 int alen, blen;
209
210 /* A filename cannot end in '.' or we treat it like it has none */
Nick Piggin621e1552011-01-07 17:49:27 +1100211 alen = name->len;
212 blen = len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 if (ms) {
Nick Piggin621e1552011-01-07 17:49:27 +1100214 while (alen && name->name[alen-1] == '.')
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 alen--;
Nick Piggin621e1552011-01-07 17:49:27 +1100216 while (blen && str[blen-1] == '.')
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 blen--;
218 }
219 if (alen == blen) {
Nick Piggin621e1552011-01-07 17:49:27 +1100220 if (ci) {
Rasmus Villemoesa97df422014-10-13 15:54:39 -0700221 if (strncasecmp(name->name, str, alen) == 0)
Nick Piggin621e1552011-01-07 17:49:27 +1100222 return 0;
223 } else {
224 if (strncmp(name->name, str, alen) == 0)
225 return 0;
226 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 }
228 return 1;
229}
230
231static int
Linus Torvaldsda53be12013-05-21 15:22:44 -0700232isofs_hashi(const struct dentry *dentry, struct qstr *qstr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233{
Al Viro966c1f72013-09-29 18:09:05 -0400234 return isofs_hashi_common(qstr, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235}
236
237static int
Linus Torvaldsda53be12013-05-21 15:22:44 -0700238isofs_dentry_cmpi(const struct dentry *parent, const struct dentry *dentry,
Nick Piggin621e1552011-01-07 17:49:27 +1100239 unsigned int len, const char *str, const struct qstr *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240{
Nick Piggin621e1552011-01-07 17:49:27 +1100241 return isofs_dentry_cmp_common(len, str, name, 0, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242}
243
244#ifdef CONFIG_JOLIET
Arnd Bergmann7ca2f232014-11-19 15:11:24 +0100245/*
246 * Compute the hash for the isofs name corresponding to the dentry.
247 */
248static int
249isofs_hash_common(struct qstr *qstr, int ms)
250{
251 const char *name;
252 int len;
253
254 len = qstr->len;
255 name = qstr->name;
256 if (ms) {
257 while (len && name[len-1] == '.')
258 len--;
259 }
260
261 qstr->hash = full_name_hash(name, len);
262
263 return 0;
264}
265
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266static int
Linus Torvaldsda53be12013-05-21 15:22:44 -0700267isofs_hash_ms(const struct dentry *dentry, struct qstr *qstr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268{
Al Viro966c1f72013-09-29 18:09:05 -0400269 return isofs_hash_common(qstr, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270}
271
272static int
Linus Torvaldsda53be12013-05-21 15:22:44 -0700273isofs_hashi_ms(const struct dentry *dentry, struct qstr *qstr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274{
Al Viro966c1f72013-09-29 18:09:05 -0400275 return isofs_hashi_common(qstr, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276}
277
278static int
Linus Torvaldsda53be12013-05-21 15:22:44 -0700279isofs_dentry_cmp_ms(const struct dentry *parent, const struct dentry *dentry,
Nick Piggin621e1552011-01-07 17:49:27 +1100280 unsigned int len, const char *str, const struct qstr *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281{
Nick Piggin621e1552011-01-07 17:49:27 +1100282 return isofs_dentry_cmp_common(len, str, name, 1, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283}
284
285static int
Linus Torvaldsda53be12013-05-21 15:22:44 -0700286isofs_dentry_cmpi_ms(const struct dentry *parent, const struct dentry *dentry,
Nick Piggin621e1552011-01-07 17:49:27 +1100287 unsigned int len, const char *str, const struct qstr *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288{
Nick Piggin621e1552011-01-07 17:49:27 +1100289 return isofs_dentry_cmp_common(len, str, name, 1, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290}
291#endif
292
293enum {
294 Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
295 Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
296 Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
Jan Kara52b680c2009-06-17 16:26:25 -0700297 Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298};
299
Steven Whitehousea447c092008-10-13 10:46:57 +0100300static const match_table_t tokens = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 {Opt_norock, "norock"},
302 {Opt_nojoliet, "nojoliet"},
303 {Opt_unhide, "unhide"},
Jeremy White9769f4e2005-06-21 17:16:53 -0700304 {Opt_hide, "hide"},
305 {Opt_showassoc, "showassoc"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 {Opt_cruft, "cruft"},
307 {Opt_utf8, "utf8"},
308 {Opt_iocharset, "iocharset=%s"},
309 {Opt_map_a, "map=acorn"},
310 {Opt_map_a, "map=a"},
311 {Opt_map_n, "map=normal"},
312 {Opt_map_n, "map=n"},
313 {Opt_map_o, "map=off"},
314 {Opt_map_o, "map=o"},
315 {Opt_session, "session=%u"},
316 {Opt_sb, "sbsector=%u"},
317 {Opt_check_r, "check=relaxed"},
318 {Opt_check_r, "check=r"},
319 {Opt_check_s, "check=strict"},
320 {Opt_check_s, "check=s"},
321 {Opt_uid, "uid=%u"},
322 {Opt_gid, "gid=%u"},
323 {Opt_mode, "mode=%u"},
Jan Kara9b7880e2008-02-08 04:21:09 -0800324 {Opt_dmode, "dmode=%u"},
Jan Kara52b680c2009-06-17 16:26:25 -0700325 {Opt_overriderockperm, "overriderockperm"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 {Opt_block, "block=%u"},
327 {Opt_ignore, "conv=binary"},
328 {Opt_ignore, "conv=b"},
329 {Opt_ignore, "conv=text"},
330 {Opt_ignore, "conv=t"},
331 {Opt_ignore, "conv=mtext"},
332 {Opt_ignore, "conv=m"},
333 {Opt_ignore, "conv=auto"},
334 {Opt_ignore, "conv=a"},
335 {Opt_nocompress, "nocompress"},
336 {Opt_err, NULL}
337};
338
Andrew Morton9eb7f2c2005-06-21 17:16:49 -0700339static int parse_options(char *options, struct iso9660_options *popt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340{
341 char *p;
342 int option;
343
344 popt->map = 'n';
Jan Kara5404ac82009-06-17 16:26:27 -0700345 popt->rock = 1;
346 popt->joliet = 1;
347 popt->cruft = 0;
348 popt->hide = 0;
349 popt->showassoc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 popt->check = 'u'; /* unset */
351 popt->nocompress = 0;
352 popt->blocksize = 1024;
Jan Kara52b680c2009-06-17 16:26:25 -0700353 popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
Jan Kara5c4a6562009-06-17 16:26:27 -0700354 popt->uid_set = 0;
355 popt->gid_set = 0;
Eric W. Biedermanba64e2b2012-02-10 11:35:50 -0800356 popt->gid = GLOBAL_ROOT_GID;
357 popt->uid = GLOBAL_ROOT_UID;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358 popt->iocharset = NULL;
359 popt->utf8 = 0;
Jan Kara52b680c2009-06-17 16:26:25 -0700360 popt->overriderockperm = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 popt->session=-1;
362 popt->sbsector=-1;
363 if (!options)
364 return 1;
365
366 while ((p = strsep(&options, ",")) != NULL) {
367 int token;
368 substring_t args[MAX_OPT_ARGS];
369 unsigned n;
370
371 if (!*p)
372 continue;
373
374 token = match_token(p, tokens, args);
375 switch (token) {
376 case Opt_norock:
Jan Kara5404ac82009-06-17 16:26:27 -0700377 popt->rock = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 break;
379 case Opt_nojoliet:
Jan Kara5404ac82009-06-17 16:26:27 -0700380 popt->joliet = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 break;
Jeremy White9769f4e2005-06-21 17:16:53 -0700382 case Opt_hide:
Jan Kara5404ac82009-06-17 16:26:27 -0700383 popt->hide = 1;
Jeremy White9769f4e2005-06-21 17:16:53 -0700384 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 case Opt_unhide:
Jeremy White9769f4e2005-06-21 17:16:53 -0700386 case Opt_showassoc:
Jan Kara5404ac82009-06-17 16:26:27 -0700387 popt->showassoc = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 break;
389 case Opt_cruft:
Jan Kara5404ac82009-06-17 16:26:27 -0700390 popt->cruft = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 break;
392 case Opt_utf8:
393 popt->utf8 = 1;
394 break;
395#ifdef CONFIG_JOLIET
396 case Opt_iocharset:
397 popt->iocharset = match_strdup(&args[0]);
398 break;
399#endif
400 case Opt_map_a:
401 popt->map = 'a';
402 break;
403 case Opt_map_o:
404 popt->map = 'o';
405 break;
406 case Opt_map_n:
407 popt->map = 'n';
408 break;
409 case Opt_session:
410 if (match_int(&args[0], &option))
411 return 0;
412 n = option;
413 if (n > 99)
414 return 0;
415 popt->session = n + 1;
416 break;
417 case Opt_sb:
418 if (match_int(&args[0], &option))
419 return 0;
420 popt->sbsector = option;
421 break;
422 case Opt_check_r:
423 popt->check = 'r';
424 break;
425 case Opt_check_s:
426 popt->check = 's';
427 break;
428 case Opt_ignore:
429 break;
430 case Opt_uid:
431 if (match_int(&args[0], &option))
432 return 0;
Eric W. Biedermanba64e2b2012-02-10 11:35:50 -0800433 popt->uid = make_kuid(current_user_ns(), option);
434 if (!uid_valid(popt->uid))
435 return 0;
Jan Kara5c4a6562009-06-17 16:26:27 -0700436 popt->uid_set = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 break;
438 case Opt_gid:
439 if (match_int(&args[0], &option))
440 return 0;
Eric W. Biedermanba64e2b2012-02-10 11:35:50 -0800441 popt->gid = make_kgid(current_user_ns(), option);
442 if (!gid_valid(popt->gid))
443 return 0;
Jan Kara5c4a6562009-06-17 16:26:27 -0700444 popt->gid_set = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 break;
446 case Opt_mode:
447 if (match_int(&args[0], &option))
448 return 0;
Jan Kara9b7880e2008-02-08 04:21:09 -0800449 popt->fmode = option;
450 break;
451 case Opt_dmode:
452 if (match_int(&args[0], &option))
453 return 0;
454 popt->dmode = option;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455 break;
Jan Kara52b680c2009-06-17 16:26:25 -0700456 case Opt_overriderockperm:
457 popt->overriderockperm = 1;
458 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 case Opt_block:
460 if (match_int(&args[0], &option))
461 return 0;
462 n = option;
463 if (n != 512 && n != 1024 && n != 2048)
464 return 0;
465 popt->blocksize = n;
466 break;
467 case Opt_nocompress:
468 popt->nocompress = 1;
469 break;
470 default:
471 return 0;
472 }
473 }
474 return 1;
475}
476
477/*
478 * look if the driver can tell the multi session redirection value
479 *
480 * don't change this if you don't know what you do, please!
481 * Multisession is legal only with XA disks.
482 * A non-XA disk with more than one volume descriptor may do it right, but
483 * usually is written in a nowhere standardized "multi-partition" manner.
484 * Multisession uses absolute addressing (solely the first frame of the whole
485 * track is #0), multi-partition uses relative addressing (each first frame of
486 * each track is #0), and a track is not a session.
487 *
488 * A broken CDwriter software or drive firmware does not set new standards,
489 * at least not if conflicting with the existing ones.
490 *
491 * emoenke@gwdg.de
492 */
493#define WE_OBEY_THE_WRITTEN_STANDARDS 1
494
Andrew Morton9eb7f2c2005-06-21 17:16:49 -0700495static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496{
497 struct cdrom_multisession ms_info;
498 unsigned int vol_desc_start;
499 struct block_device *bdev = sb->s_bdev;
500 int i;
501
502 vol_desc_start=0;
503 ms_info.addr_format=CDROM_LBA;
504 if(session >= 0 && session <= 99) {
505 struct cdrom_tocentry Te;
506 Te.cdte_track=session;
507 Te.cdte_format=CDROM_LBA;
508 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
509 if (!i) {
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700510 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
511 session, Te.cdte_addr.lba,
512 Te.cdte_ctrl&CDROM_DATA_TRACK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700513 if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
514 return Te.cdte_addr.lba;
515 }
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700516
517 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700518 }
519 i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
Andrew Morton9eb7f2c2005-06-21 17:16:49 -0700520 if (session > 0)
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700521 printk(KERN_ERR "ISOFS: Invalid session number\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522#if 0
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700523 printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524 if (i==0) {
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700525 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
526 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 }
528#endif
529 if (i==0)
530#if WE_OBEY_THE_WRITTEN_STANDARDS
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700531 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532#endif
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700533 vol_desc_start=ms_info.addr.lba;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 return vol_desc_start;
535}
536
537/*
Ondrej Zarye45c9ef2010-10-27 15:33:30 -0700538 * Check if root directory is empty (has less than 3 files).
539 *
540 * Used to detect broken CDs where ISO root directory is empty but Joliet root
541 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
542 * (and Joliet used instead) or else no files would be visible.
543 */
544static bool rootdir_empty(struct super_block *sb, unsigned long block)
545{
546 int offset = 0, files = 0, de_len;
547 struct iso_directory_record *de;
548 struct buffer_head *bh;
549
550 bh = sb_bread(sb, block);
551 if (!bh)
552 return true;
553 while (files < 3) {
554 de = (struct iso_directory_record *) (bh->b_data + offset);
555 de_len = *(unsigned char *) de;
556 if (de_len == 0)
557 break;
558 files++;
559 offset += de_len;
560 }
561 brelse(bh);
562 return files < 3;
563}
564
565/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566 * Initialize the superblock and read the root inode.
567 *
568 * Note: a check_disk_change() has been done immediately prior
569 * to this call, so we don't need to check again.
570 */
571static int isofs_fill_super(struct super_block *s, void *data, int silent)
572{
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700573 struct buffer_head *bh = NULL, *pri_bh = NULL;
574 struct hs_primary_descriptor *h_pri = NULL;
575 struct iso_primary_descriptor *pri = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 struct iso_supplementary_descriptor *sec = NULL;
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700577 struct iso_directory_record *rootp;
578 struct inode *inode;
579 struct iso9660_options opt;
580 struct isofs_sb_info *sbi;
581 unsigned long first_data_zone;
582 int joliet_level = 0;
583 int iso_blknum, block;
584 int orig_zonesize;
David Howellsc4386c82008-02-07 00:15:41 -0800585 int table, error = -EINVAL;
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700586 unsigned int vol_desc_start;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700587
Miklos Szeredid0132ee2008-02-08 04:21:46 -0800588 save_mount_options(s, data);
589
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700590 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
Arnd Bergmann4f819a72010-09-12 19:05:56 +0200591 if (!sbi)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592 return -ENOMEM;
593 s->s_fs_info = sbi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594
Andrew Morton9eb7f2c2005-06-21 17:16:49 -0700595 if (!parse_options((char *)data, &opt))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596 goto out_freesbi;
597
598 /*
599 * First of all, get the hardware blocksize for this device.
600 * If we don't know what it is, or the hardware blocksize is
601 * larger than the blocksize the user specified, then use
602 * that value.
603 */
604 /*
605 * What if bugger tells us to go beyond page size?
606 */
607 opt.blocksize = sb_min_blocksize(s, opt.blocksize);
608
609 sbi->s_high_sierra = 0; /* default is iso9660 */
610
611 vol_desc_start = (opt.sbsector != -1) ?
612 opt.sbsector : isofs_get_last_session(s,opt.session);
613
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700614 for (iso_blknum = vol_desc_start+16;
615 iso_blknum < vol_desc_start+100; iso_blknum++) {
616 struct hs_volume_descriptor *hdp;
617 struct iso_volume_descriptor *vdp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700619 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
620 if (!(bh = sb_bread(s, block)))
621 goto out_no_read;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700623 vdp = (struct iso_volume_descriptor *)bh->b_data;
624 hdp = (struct hs_volume_descriptor *)bh->b_data;
625
626 /*
627 * Due to the overlapping physical location of the descriptors,
628 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
629 * proper identification in this case, we first check for ISO.
630 */
631 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
632 if (isonum_711(vdp->type) == ISO_VD_END)
633 break;
634 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
635 if (pri == NULL) {
636 pri = (struct iso_primary_descriptor *)vdp;
637 /* Save the buffer in case we need it ... */
638 pri_bh = bh;
639 bh = NULL;
640 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 }
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700642#ifdef CONFIG_JOLIET
643 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
644 sec = (struct iso_supplementary_descriptor *)vdp;
645 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
Bartlomiej Zolnierkiewicz8711c672009-07-10 12:34:27 +0200646 if (opt.joliet) {
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700647 if (sec->escape[2] == 0x40)
648 joliet_level = 1;
649 else if (sec->escape[2] == 0x43)
650 joliet_level = 2;
651 else if (sec->escape[2] == 0x45)
652 joliet_level = 3;
653
654 printk(KERN_DEBUG "ISO 9660 Extensions: "
655 "Microsoft Joliet Level %d\n",
656 joliet_level);
657 }
658 goto root_found;
659 } else {
660 /* Unknown supplementary volume descriptor */
661 sec = NULL;
662 }
663 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700664#endif
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700665 } else {
666 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
667 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
668 goto out_freebh;
669
670 sbi->s_high_sierra = 1;
Jan Kara5404ac82009-06-17 16:26:27 -0700671 opt.rock = 0;
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700672 h_pri = (struct hs_primary_descriptor *)vdp;
673 goto root_found;
674 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700675 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700676
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700677 /* Just skip any volume descriptors we don't recognize */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700678
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700679 brelse(bh);
680 bh = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681 }
682 /*
683 * If we fall through, either no volume descriptor was found,
684 * or else we passed a primary descriptor looking for others.
685 */
686 if (!pri)
687 goto out_unknown_format;
688 brelse(bh);
689 bh = pri_bh;
690 pri_bh = NULL;
691
692root_found:
693
Jan Kara5404ac82009-06-17 16:26:27 -0700694 if (joliet_level && (pri == NULL || !opt.rock)) {
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700695 /* This is the case of Joliet with the norock mount flag.
696 * A disc with both Joliet and Rock Ridge is handled later
697 */
698 pri = (struct iso_primary_descriptor *) sec;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699 }
700
701 if(sbi->s_high_sierra){
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700702 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
703 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
704 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
705 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700706 } else {
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700707 if (!pri)
708 goto out_freebh;
709 rootp = (struct iso_directory_record *) pri->root_directory_record;
710 sbi->s_nzones = isonum_733(pri->volume_space_size);
711 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
712 sbi->s_max_size = isonum_733(pri->volume_space_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700713 }
714
715 sbi->s_ninodes = 0; /* No way to figure this out easily */
716
717 orig_zonesize = sbi->s_log_zone_size;
718 /*
719 * If the zone size is smaller than the hardware sector size,
720 * this is a fatal error. This would occur if the disc drive
721 * had sectors that were 2048 bytes, but the filesystem had
722 * blocks that were 512 bytes (which should only very rarely
723 * happen.)
724 */
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700725 if (orig_zonesize < opt.blocksize)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726 goto out_bad_size;
727
728 /* RDE: convert log zone size to bit shift */
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700729 switch (sbi->s_log_zone_size) {
730 case 512: sbi->s_log_zone_size = 9; break;
731 case 1024: sbi->s_log_zone_size = 10; break;
732 case 2048: sbi->s_log_zone_size = 11; break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700734 default:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735 goto out_bad_zone_size;
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700736 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737
738 s->s_magic = ISOFS_SUPER_MAGIC;
Jan Andres66a362a2010-08-04 22:52:46 +0200739
740 /*
741 * With multi-extent files, file size is only limited by the maximum
742 * size of a file system, which is 8 TB.
743 */
744 s->s_maxbytes = 0x80000000000LL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700745
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746 /* Set this for reference. Its not currently used except on write
747 which we don't have .. */
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700748
749 first_data_zone = isonum_733(rootp->extent) +
750 isonum_711(rootp->ext_attr_length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700751 sbi->s_firstdatazone = first_data_zone;
752#ifndef BEQUIET
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700753 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n",
754 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
755 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756 if(sbi->s_high_sierra)
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700757 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758#endif
759
760 /*
761 * If the Joliet level is set, we _may_ decide to use the
762 * secondary descriptor, but can't be sure until after we
763 * read the root inode. But before reading the root inode
764 * we may need to change the device blocksize, and would
765 * rather release the old buffer first. So, we cache the
766 * first_data_zone value from the secondary descriptor.
767 */
768 if (joliet_level) {
769 pri = (struct iso_primary_descriptor *) sec;
770 rootp = (struct iso_directory_record *)
771 pri->root_directory_record;
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700772 first_data_zone = isonum_733(rootp->extent) +
773 isonum_711(rootp->ext_attr_length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774 }
775
776 /*
777 * We're all done using the volume descriptor, and may need
778 * to change the device blocksize, so release the buffer now.
779 */
780 brelse(pri_bh);
781 brelse(bh);
782
783 /*
784 * Force the blocksize to 512 for 512 byte sectors. The file
785 * read primitives really get it wrong in a bad way if we don't
786 * do this.
787 *
788 * Note - we should never be setting the blocksize to something
789 * less than the hardware sector size for the device. If we
790 * do, we would end up having to read larger buffers and split
791 * out portions to satisfy requests.
792 *
793 * Note2- the idea here is that we want to deal with the optimal
794 * zonesize in the filesystem. If we have it set to something less,
795 * then we have horrible problems with trying to piece together
796 * bits of adjacent blocks in order to properly read directory
797 * entries. By forcing the blocksize in this way, we ensure
798 * that we will never be required to do this.
799 */
800 sb_set_blocksize(s, orig_zonesize);
801
802 sbi->s_nls_iocharset = NULL;
803
804#ifdef CONFIG_JOLIET
805 if (joliet_level && opt.utf8 == 0) {
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700806 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807 sbi->s_nls_iocharset = load_nls(p);
808 if (! sbi->s_nls_iocharset) {
809 /* Fail only if explicit charset specified */
810 if (opt.iocharset)
811 goto out_freesbi;
812 sbi->s_nls_iocharset = load_nls_default();
813 }
814 }
815#endif
816 s->s_op = &isofs_sops;
817 s->s_export_op = &isofs_export_ops;
818 sbi->s_mapping = opt.map;
Jan Kara5404ac82009-06-17 16:26:27 -0700819 sbi->s_rock = (opt.rock ? 2 : 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700820 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
821 sbi->s_cruft = opt.cruft;
Jeremy White9769f4e2005-06-21 17:16:53 -0700822 sbi->s_hide = opt.hide;
823 sbi->s_showassoc = opt.showassoc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700824 sbi->s_uid = opt.uid;
825 sbi->s_gid = opt.gid;
Jan Kara5c4a6562009-06-17 16:26:27 -0700826 sbi->s_uid_set = opt.uid_set;
827 sbi->s_gid_set = opt.gid_set;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700828 sbi->s_utf8 = opt.utf8;
829 sbi->s_nocompress = opt.nocompress;
Jan Kara52b680c2009-06-17 16:26:25 -0700830 sbi->s_overriderockperm = opt.overriderockperm;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700831 /*
832 * It would be incredibly stupid to allow people to mark every file
833 * on the disk as suid, so we merely allow them to set the default
834 * permissions.
835 */
Jan Kara52b680c2009-06-17 16:26:25 -0700836 if (opt.fmode != ISOFS_INVALID_MODE)
837 sbi->s_fmode = opt.fmode & 0777;
838 else
839 sbi->s_fmode = ISOFS_INVALID_MODE;
840 if (opt.dmode != ISOFS_INVALID_MODE)
841 sbi->s_dmode = opt.dmode & 0777;
842 else
843 sbi->s_dmode = ISOFS_INVALID_MODE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700844
845 /*
846 * Read the root inode, which _may_ result in changing
847 * the s_rock flag. Once we have the final s_rock value,
848 * we then decide whether to use the Joliet descriptor.
849 */
850 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
David Howellsc4386c82008-02-07 00:15:41 -0800851 if (IS_ERR(inode))
852 goto out_no_root;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700853
854 /*
Ondrej Zarye45c9ef2010-10-27 15:33:30 -0700855 * Fix for broken CDs with Rock Ridge and empty ISO root directory but
856 * correct Joliet root directory.
857 */
858 if (sbi->s_rock == 1 && joliet_level &&
859 rootdir_empty(s, sbi->s_firstdatazone)) {
860 printk(KERN_NOTICE
861 "ISOFS: primary root directory is empty. "
862 "Disabling Rock Ridge and switching to Joliet.");
863 sbi->s_rock = 0;
864 }
865
866 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867 * If this disk has both Rock Ridge and Joliet on it, then we
868 * want to use Rock Ridge by default. This can be overridden
869 * by using the norock mount option. There is still one other
870 * possibility that is not taken into account: a Rock Ridge
871 * CD with Unicode names. Until someone sees such a beast, it
872 * will not be supported.
873 */
874 if (sbi->s_rock == 1) {
875 joliet_level = 0;
876 } else if (joliet_level) {
877 sbi->s_rock = 0;
878 if (sbi->s_firstdatazone != first_data_zone) {
879 sbi->s_firstdatazone = first_data_zone;
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700880 printk(KERN_DEBUG
Linus Torvalds1da177e2005-04-16 15:20:36 -0700881 "ISOFS: changing to secondary root\n");
882 iput(inode);
883 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
David Howellsc4386c82008-02-07 00:15:41 -0800884 if (IS_ERR(inode))
885 goto out_no_root;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700886 }
887 }
888
889 if (opt.check == 'u') {
890 /* Only Joliet is case insensitive by default */
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700891 if (joliet_level)
892 opt.check = 'r';
893 else
894 opt.check = 's';
Linus Torvalds1da177e2005-04-16 15:20:36 -0700895 }
896 sbi->s_joliet_level = joliet_level;
897
Kirill Kuvaldin817794e2007-07-31 00:38:58 -0700898 /* Make sure the root inode is a directory */
899 if (!S_ISDIR(inode->i_mode)) {
900 printk(KERN_WARNING
901 "isofs_fill_super: root inode is not a directory. "
902 "Corrupted media?\n");
903 goto out_iput;
904 }
905
Linus Torvalds1da177e2005-04-16 15:20:36 -0700906 table = 0;
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700907 if (joliet_level)
908 table += 2;
909 if (opt.check == 'r')
910 table++;
Al Viro6cc9c1d2010-12-18 10:29:26 -0500911
Al Virob0afd8e2014-10-28 18:40:11 -0400912 if (table)
913 s->s_d_op = &isofs_dentry_ops[table - 1];
Al Viro6cc9c1d2010-12-18 10:29:26 -0500914
915 /* get the root dentry */
Al Viro48fde702012-01-08 22:15:13 -0500916 s->s_root = d_make_root(inode);
Al Viro8fdd8c42012-01-09 10:48:11 -0500917 if (!(s->s_root)) {
Al Viro8fdd8c42012-01-09 10:48:11 -0500918 error = -ENOMEM;
919 goto out_no_inode;
920 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800922 kfree(opt.iocharset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923
924 return 0;
925
926 /*
927 * Display error messages and free resources.
928 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700929out_iput:
930 iput(inode);
David Howellsc4386c82008-02-07 00:15:41 -0800931 goto out_no_inode;
932out_no_root:
933 error = PTR_ERR(inode);
934 if (error != -ENOMEM)
935 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
936out_no_inode:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700937#ifdef CONFIG_JOLIET
Thomas Gleixner6d729e42009-08-16 21:05:08 +0000938 unload_nls(sbi->s_nls_iocharset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700939#endif
940 goto out_freesbi;
941out_no_read:
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700942 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
943 __func__, s->s_id, iso_blknum, block);
Linus Torvaldsc11760c2011-06-08 10:30:03 -0700944 goto out_freebh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700945out_bad_zone_size:
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700946 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700947 sbi->s_log_zone_size);
948 goto out_freebh;
949out_bad_size:
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700950 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951 orig_zonesize, opt.blocksize);
952 goto out_freebh;
953out_unknown_format:
954 if (!silent)
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700955 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956
957out_freebh:
958 brelse(bh);
Linus Torvaldsc11760c2011-06-08 10:30:03 -0700959 brelse(pri_bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700960out_freesbi:
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800961 kfree(opt.iocharset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962 kfree(sbi);
963 s->s_fs_info = NULL;
David Howellsc4386c82008-02-07 00:15:41 -0800964 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965}
966
David Howells726c3342006-06-23 02:02:58 -0700967static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700968{
David Howells726c3342006-06-23 02:02:58 -0700969 struct super_block *sb = dentry->d_sb;
Coly Li2430c4d2009-04-02 16:59:38 -0700970 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
David Howells726c3342006-06-23 02:02:58 -0700971
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972 buf->f_type = ISOFS_SUPER_MAGIC;
973 buf->f_bsize = sb->s_blocksize;
974 buf->f_blocks = (ISOFS_SB(sb)->s_nzones
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700975 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700976 buf->f_bfree = 0;
977 buf->f_bavail = 0;
978 buf->f_files = ISOFS_SB(sb)->s_ninodes;
979 buf->f_ffree = 0;
Coly Li2430c4d2009-04-02 16:59:38 -0700980 buf->f_fsid.val[0] = (u32)id;
981 buf->f_fsid.val[1] = (u32)(id >> 32);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982 buf->f_namelen = NAME_MAX;
983 return 0;
984}
985
986/*
987 * Get a set of blocks; filling in buffer_heads if already allocated
988 * or getblk() if they are not. Returns the number of blocks inserted
David Howellsc4386c82008-02-07 00:15:41 -0800989 * (-ve == error.)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700990 */
Jan Karafde214d2010-10-04 11:37:37 +0200991int isofs_get_blocks(struct inode *inode, sector_t iblock,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700992 struct buffer_head **bh, unsigned long nblocks)
993{
Jan Karafde214d2010-10-04 11:37:37 +0200994 unsigned long b_off = iblock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995 unsigned offset, sect_size;
996 unsigned int firstext;
997 unsigned long nextblk, nextoff;
David Howellsc4386c82008-02-07 00:15:41 -0800998 int section, rv, error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700999 struct iso_inode_info *ei = ISOFS_I(inode);
1000
David Howellsc4386c82008-02-07 00:15:41 -08001001 error = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001002 rv = 0;
Jan Karafde214d2010-10-04 11:37:37 +02001003 if (iblock != b_off) {
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001004 printk(KERN_DEBUG "%s: block number too large\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005 goto abort;
1006 }
1007
Linus Torvalds1da177e2005-04-16 15:20:36 -07001008
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001009 offset = 0;
1010 firstext = ei->i_first_extent;
1011 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
1012 nextblk = ei->i_next_section_block;
1013 nextoff = ei->i_next_section_offset;
1014 section = 0;
1015
1016 while (nblocks) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017 /* If we are *way* beyond the end of the file, print a message.
1018 * Access beyond the end of the file up to the next page boundary
1019 * is normal, however because of the way the page cache works.
1020 * In this case, we just return 0 so that we can properly fill
1021 * the page with useless information without generating any
1022 * I/O errors.
1023 */
1024 if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
Jan Karafde214d2010-10-04 11:37:37 +02001025 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
1026 __func__, b_off,
1027 (unsigned long long)inode->i_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001028 goto abort;
1029 }
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001030
Joel & Rebecca VanderZeefb50ae72006-09-29 02:00:30 -07001031 /* On the last section, nextblk == 0, section size is likely to
1032 * exceed sect_size by a partial block, and access beyond the
1033 * end of the file will reach beyond the section size, too.
1034 */
1035 while (nextblk && (b_off >= (offset + sect_size))) {
1036 struct inode *ninode;
1037
1038 offset += sect_size;
1039 ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
David Howellsc4386c82008-02-07 00:15:41 -08001040 if (IS_ERR(ninode)) {
1041 error = PTR_ERR(ninode);
Joel & Rebecca VanderZeefb50ae72006-09-29 02:00:30 -07001042 goto abort;
David Howellsc4386c82008-02-07 00:15:41 -08001043 }
Joel & Rebecca VanderZeefb50ae72006-09-29 02:00:30 -07001044 firstext = ISOFS_I(ninode)->i_first_extent;
1045 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1046 nextblk = ISOFS_I(ninode)->i_next_section_block;
1047 nextoff = ISOFS_I(ninode)->i_next_section_offset;
1048 iput(ninode);
1049
1050 if (++section > 100) {
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001051 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1052 " aborting...\n", __func__);
Jan Karafde214d2010-10-04 11:37:37 +02001053 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001054 "nextblk=%lu nextoff=%lu\n", __func__,
Jan Karafde214d2010-10-04 11:37:37 +02001055 b_off, firstext, (unsigned) sect_size,
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001056 nextblk, nextoff);
Joel & Rebecca VanderZeefb50ae72006-09-29 02:00:30 -07001057 goto abort;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001058 }
1059 }
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001060
1061 if (*bh) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001062 map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1063 } else {
1064 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001065 if (!*bh)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001066 goto abort;
1067 }
1068 bh++; /* Next buffer head */
1069 b_off++; /* Next buffer offset */
1070 nblocks--;
1071 rv++;
1072 }
1073
David Howellsc4386c82008-02-07 00:15:41 -08001074 error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001075abort:
David Howellsc4386c82008-02-07 00:15:41 -08001076 return rv != 0 ? rv : error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001077}
1078
1079/*
1080 * Used by the standard interfaces.
1081 */
1082static int isofs_get_block(struct inode *inode, sector_t iblock,
1083 struct buffer_head *bh_result, int create)
1084{
David Howellsc4386c82008-02-07 00:15:41 -08001085 int ret;
1086
Andrew Morton9eb7f2c2005-06-21 17:16:49 -07001087 if (create) {
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001088 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001089 return -EROFS;
1090 }
1091
David Howellsc4386c82008-02-07 00:15:41 -08001092 ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1093 return ret < 0 ? ret : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001094}
1095
1096static int isofs_bmap(struct inode *inode, sector_t block)
1097{
1098 struct buffer_head dummy;
1099 int error;
1100
1101 dummy.b_state = 0;
1102 dummy.b_blocknr = -1000;
1103 error = isofs_get_block(inode, block, &dummy, 0);
1104 if (!error)
1105 return dummy.b_blocknr;
1106 return 0;
1107}
1108
1109struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1110{
1111 sector_t blknr = isofs_bmap(inode, block);
1112 if (!blknr)
1113 return NULL;
1114 return sb_bread(inode->i_sb, blknr);
1115}
1116
1117static int isofs_readpage(struct file *file, struct page *page)
1118{
Namjae Jeon30690832011-11-02 13:38:00 -07001119 return mpage_readpage(page, isofs_get_block);
1120}
1121
1122static int isofs_readpages(struct file *file, struct address_space *mapping,
1123 struct list_head *pages, unsigned nr_pages)
1124{
1125 return mpage_readpages(mapping, pages, nr_pages, isofs_get_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001126}
1127
1128static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1129{
1130 return generic_block_bmap(mapping,block,isofs_get_block);
1131}
1132
Christoph Hellwigf5e54d62006-06-28 04:26:44 -07001133static const struct address_space_operations isofs_aops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001134 .readpage = isofs_readpage,
Namjae Jeon30690832011-11-02 13:38:00 -07001135 .readpages = isofs_readpages,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001136 .bmap = _isofs_bmap
1137};
1138
Andrew Morton9eb7f2c2005-06-21 17:16:49 -07001139static int isofs_read_level3_size(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001140{
1141 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1142 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001143 struct buffer_head *bh = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001144 unsigned long block, offset, block_saved, offset_saved;
1145 int i = 0;
1146 int more_entries = 0;
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001147 struct iso_directory_record *tmpde = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001148 struct iso_inode_info *ei = ISOFS_I(inode);
1149
1150 inode->i_size = 0;
1151
1152 /* The first 16 blocks are reserved as the System Area. Thus,
1153 * no inodes can appear in block 0. We use this to flag that
1154 * this is the last section. */
1155 ei->i_next_section_block = 0;
1156 ei->i_next_section_offset = 0;
1157
1158 block = ei->i_iget5_block;
1159 offset = ei->i_iget5_offset;
1160
1161 do {
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001162 struct iso_directory_record *de;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001163 unsigned int de_len;
1164
1165 if (!bh) {
1166 bh = sb_bread(inode->i_sb, block);
1167 if (!bh)
1168 goto out_noread;
1169 }
1170 de = (struct iso_directory_record *) (bh->b_data + offset);
1171 de_len = *(unsigned char *) de;
1172
1173 if (de_len == 0) {
1174 brelse(bh);
1175 bh = NULL;
1176 ++block;
1177 offset = 0;
1178 continue;
1179 }
1180
1181 block_saved = block;
1182 offset_saved = offset;
1183 offset += de_len;
1184
1185 /* Make sure we have a full directory entry */
1186 if (offset >= bufsize) {
1187 int slop = bufsize - offset + de_len;
1188 if (!tmpde) {
1189 tmpde = kmalloc(256, GFP_KERNEL);
1190 if (!tmpde)
1191 goto out_nomem;
1192 }
1193 memcpy(tmpde, de, slop);
1194 offset &= bufsize - 1;
1195 block++;
1196 brelse(bh);
1197 bh = NULL;
1198 if (offset) {
1199 bh = sb_bread(inode->i_sb, block);
1200 if (!bh)
1201 goto out_noread;
Andrew Morton9eb7f2c2005-06-21 17:16:49 -07001202 memcpy((void *)tmpde+slop, bh->b_data, offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001203 }
1204 de = tmpde;
1205 }
1206
1207 inode->i_size += isonum_733(de->size);
1208 if (i == 1) {
1209 ei->i_next_section_block = block_saved;
1210 ei->i_next_section_offset = offset_saved;
1211 }
1212
1213 more_entries = de->flags[-high_sierra] & 0x80;
1214
1215 i++;
Andrew Morton9eb7f2c2005-06-21 17:16:49 -07001216 if (i > 100)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001217 goto out_toomany;
Andrew Morton9eb7f2c2005-06-21 17:16:49 -07001218 } while (more_entries);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001219out:
Andrew Morton9eb7f2c2005-06-21 17:16:49 -07001220 kfree(tmpde);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001221 if (bh)
1222 brelse(bh);
1223 return 0;
1224
1225out_nomem:
1226 if (bh)
1227 brelse(bh);
1228 return -ENOMEM;
1229
1230out_noread:
1231 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
Jesper Juhlf99d49a2005-11-07 01:01:34 -08001232 kfree(tmpde);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001233 return -EIO;
1234
1235out_toomany:
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001236 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1237 "isofs_read_level3_size: inode=%lu\n",
1238 __func__, inode->i_ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001239 goto out;
1240}
1241
Jan Kara410dd3c2014-08-17 11:49:57 +02001242static int isofs_read_inode(struct inode *inode, int relocated)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001243{
1244 struct super_block *sb = inode->i_sb;
1245 struct isofs_sb_info *sbi = ISOFS_SB(sb);
1246 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1247 unsigned long block;
1248 int high_sierra = sbi->s_high_sierra;
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001249 struct buffer_head *bh = NULL;
1250 struct iso_directory_record *de;
1251 struct iso_directory_record *tmpde = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001252 unsigned int de_len;
1253 unsigned long offset;
1254 struct iso_inode_info *ei = ISOFS_I(inode);
David Howellsc4386c82008-02-07 00:15:41 -08001255 int ret = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001256
1257 block = ei->i_iget5_block;
1258 bh = sb_bread(inode->i_sb, block);
1259 if (!bh)
1260 goto out_badread;
1261
1262 offset = ei->i_iget5_offset;
1263
1264 de = (struct iso_directory_record *) (bh->b_data + offset);
1265 de_len = *(unsigned char *) de;
1266
1267 if (offset + de_len > bufsize) {
1268 int frag1 = bufsize - offset;
1269
1270 tmpde = kmalloc(de_len, GFP_KERNEL);
1271 if (tmpde == NULL) {
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001272 printk(KERN_INFO "%s: out of memory\n", __func__);
David Howellsc4386c82008-02-07 00:15:41 -08001273 ret = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001274 goto fail;
1275 }
1276 memcpy(tmpde, bh->b_data + offset, frag1);
1277 brelse(bh);
1278 bh = sb_bread(inode->i_sb, ++block);
1279 if (!bh)
1280 goto out_badread;
1281 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1282 de = tmpde;
1283 }
1284
1285 inode->i_ino = isofs_get_ino(ei->i_iget5_block,
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001286 ei->i_iget5_offset,
1287 ISOFS_BUFFER_BITS(inode));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001288
1289 /* Assume it is a normal-format file unless told otherwise */
1290 ei->i_file_format = isofs_file_normal;
1291
1292 if (de->flags[-high_sierra] & 2) {
Jan Kara52b680c2009-06-17 16:26:25 -07001293 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1294 inode->i_mode = S_IFDIR | sbi->s_dmode;
1295 else
1296 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
Miklos Szeredibfe86842011-10-28 14:13:29 +02001297 set_nlink(inode, 1); /*
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001298 * Set to 1. We know there are 2, but
1299 * the find utility tries to optimize
1300 * if it is 2, and it screws up. It is
1301 * easier to give 1 which tells find to
1302 * do it the hard way.
1303 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001304 } else {
Jan Kara52b680c2009-06-17 16:26:25 -07001305 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1306 inode->i_mode = S_IFREG | sbi->s_fmode;
1307 } else {
1308 /*
1309 * Set default permissions: r-x for all. The disc
1310 * could be shared with DOS machines so virtually
1311 * anything could be a valid executable.
1312 */
1313 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1314 }
Miklos Szeredibfe86842011-10-28 14:13:29 +02001315 set_nlink(inode, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001316 }
1317 inode->i_uid = sbi->s_uid;
1318 inode->i_gid = sbi->s_gid;
Theodore Ts'oba52de12006-09-27 01:50:49 -07001319 inode->i_blocks = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001320
1321 ei->i_format_parm[0] = 0;
1322 ei->i_format_parm[1] = 0;
1323 ei->i_format_parm[2] = 0;
1324
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001325 ei->i_section_size = isonum_733(de->size);
Andrew Morton9eb7f2c2005-06-21 17:16:49 -07001326 if (de->flags[-high_sierra] & 0x80) {
David Howellsc4386c82008-02-07 00:15:41 -08001327 ret = isofs_read_level3_size(inode);
1328 if (ret < 0)
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001329 goto fail;
David Howellsc4386c82008-02-07 00:15:41 -08001330 ret = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001331 } else {
1332 ei->i_next_section_block = 0;
1333 ei->i_next_section_offset = 0;
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001334 inode->i_size = isonum_733(de->size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001335 }
1336
1337 /*
1338 * Some dipshit decided to store some other bit of information
1339 * in the high byte of the file length. Truncate size in case
1340 * this CDROM was mounted with the cruft option.
1341 */
1342
Jan Kara5404ac82009-06-17 16:26:27 -07001343 if (sbi->s_cruft)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001344 inode->i_size &= 0x00ffffff;
1345
1346 if (de->interleave[0]) {
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001347 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001348 inode->i_size = 0;
1349 }
1350
1351 /* I have no idea what file_unit_size is used for, so
1352 we will flag it for now */
1353 if (de->file_unit_size[0] != 0) {
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001354 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1355 inode->i_ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001356 }
1357
1358 /* I have no idea what other flag bits are used for, so
1359 we will flag it for now */
1360#ifdef DEBUG
1361 if((de->flags[-high_sierra] & ~2)!= 0){
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001362 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1363 "(%ld %x).\n",
1364 inode->i_ino, de->flags[-high_sierra]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001365 }
1366#endif
1367
1368 inode->i_mtime.tv_sec =
1369 inode->i_atime.tv_sec =
1370 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1371 inode->i_mtime.tv_nsec =
1372 inode->i_atime.tv_nsec =
1373 inode->i_ctime.tv_nsec = 0;
1374
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001375 ei->i_first_extent = (isonum_733(de->extent) +
1376 isonum_711(de->ext_attr_length));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001377
1378 /* Set the number of blocks for stat() - should be done before RR */
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001379 inode->i_blocks = (inode->i_size + 511) >> 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001380
1381 /*
1382 * Now test for possible Rock Ridge extensions which will override
1383 * some of these numbers in the inode structure.
1384 */
1385
1386 if (!high_sierra) {
Jan Kara410dd3c2014-08-17 11:49:57 +02001387 parse_rock_ridge_inode(de, inode, relocated);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001388 /* if we want uid/gid set, override the rock ridge setting */
Jan Kara5c4a6562009-06-17 16:26:27 -07001389 if (sbi->s_uid_set)
1390 inode->i_uid = sbi->s_uid;
1391 if (sbi->s_gid_set)
1392 inode->i_gid = sbi->s_gid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001393 }
Jan Kara52b680c2009-06-17 16:26:25 -07001394 /* Now set final access rights if overriding rock ridge setting */
1395 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1396 sbi->s_dmode != ISOFS_INVALID_MODE)
1397 inode->i_mode = S_IFDIR | sbi->s_dmode;
1398 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1399 sbi->s_fmode != ISOFS_INVALID_MODE)
1400 inode->i_mode = S_IFREG | sbi->s_fmode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001401
1402 /* Install the inode operations vector */
1403 if (S_ISREG(inode->i_mode)) {
1404 inode->i_fop = &generic_ro_fops;
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001405 switch (ei->i_file_format) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001406#ifdef CONFIG_ZISOFS
1407 case isofs_file_compressed:
1408 inode->i_data.a_ops = &zisofs_aops;
1409 break;
1410#endif
1411 default:
1412 inode->i_data.a_ops = &isofs_aops;
1413 break;
1414 }
1415 } else if (S_ISDIR(inode->i_mode)) {
1416 inode->i_op = &isofs_dir_inode_operations;
1417 inode->i_fop = &isofs_dir_operations;
1418 } else if (S_ISLNK(inode->i_mode)) {
1419 inode->i_op = &page_symlink_inode_operations;
Al Viro21fc61c2015-11-17 01:07:57 -05001420 inode_nohighmem(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001421 inode->i_data.a_ops = &isofs_symlink_aops;
1422 } else
1423 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1424 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1425
David Howellsc4386c82008-02-07 00:15:41 -08001426 ret = 0;
Andrew Morton9eb7f2c2005-06-21 17:16:49 -07001427out:
Jesper Juhlf99d49a2005-11-07 01:01:34 -08001428 kfree(tmpde);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001429 if (bh)
1430 brelse(bh);
David Howellsc4386c82008-02-07 00:15:41 -08001431 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001432
Andrew Morton9eb7f2c2005-06-21 17:16:49 -07001433out_badread:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001434 printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
Andrew Morton9eb7f2c2005-06-21 17:16:49 -07001435fail:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001436 goto out;
1437}
1438
1439struct isofs_iget5_callback_data {
1440 unsigned long block;
1441 unsigned long offset;
1442};
1443
1444static int isofs_iget5_test(struct inode *ino, void *data)
1445{
1446 struct iso_inode_info *i = ISOFS_I(ino);
1447 struct isofs_iget5_callback_data *d =
1448 (struct isofs_iget5_callback_data*)data;
1449 return (i->i_iget5_block == d->block)
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001450 && (i->i_iget5_offset == d->offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001451}
1452
1453static int isofs_iget5_set(struct inode *ino, void *data)
1454{
1455 struct iso_inode_info *i = ISOFS_I(ino);
1456 struct isofs_iget5_callback_data *d =
1457 (struct isofs_iget5_callback_data*)data;
1458 i->i_iget5_block = d->block;
1459 i->i_iget5_offset = d->offset;
1460 return 0;
1461}
1462
1463/* Store, in the inode's containing structure, the block and block
1464 * offset that point to the underlying meta-data for the inode. The
1465 * code below is otherwise similar to the iget() code in
1466 * include/linux/fs.h */
Jan Kara410dd3c2014-08-17 11:49:57 +02001467struct inode *__isofs_iget(struct super_block *sb,
1468 unsigned long block,
1469 unsigned long offset,
1470 int relocated)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001471{
1472 unsigned long hashval;
1473 struct inode *inode;
1474 struct isofs_iget5_callback_data data;
David Howellsc4386c82008-02-07 00:15:41 -08001475 long ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001476
1477 if (offset >= 1ul << sb->s_blocksize_bits)
David Howellsc4386c82008-02-07 00:15:41 -08001478 return ERR_PTR(-EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001479
1480 data.block = block;
1481 data.offset = offset;
1482
1483 hashval = (block << sb->s_blocksize_bits) | offset;
1484
Andrew Morton9eb7f2c2005-06-21 17:16:49 -07001485 inode = iget5_locked(sb, hashval, &isofs_iget5_test,
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001486 &isofs_iget5_set, &data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001487
David Howellsc4386c82008-02-07 00:15:41 -08001488 if (!inode)
1489 return ERR_PTR(-ENOMEM);
1490
1491 if (inode->i_state & I_NEW) {
Jan Kara410dd3c2014-08-17 11:49:57 +02001492 ret = isofs_read_inode(inode, relocated);
David Howellsc4386c82008-02-07 00:15:41 -08001493 if (ret < 0) {
1494 iget_failed(inode);
1495 inode = ERR_PTR(ret);
1496 } else {
1497 unlock_new_inode(inode);
1498 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001499 }
1500
1501 return inode;
1502}
1503
Al Viro152a0832010-07-25 00:46:55 +04001504static struct dentry *isofs_mount(struct file_system_type *fs_type,
1505 int flags, const char *dev_name, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001506{
Jan Kara17b7f7c2013-07-25 11:49:11 +02001507 /* We don't support read-write mounts */
1508 if (!(flags & MS_RDONLY))
1509 return ERR_PTR(-EACCES);
Al Viro152a0832010-07-25 00:46:55 +04001510 return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001511}
1512
1513static struct file_system_type iso9660_fs_type = {
1514 .owner = THIS_MODULE,
1515 .name = "iso9660",
Al Viro152a0832010-07-25 00:46:55 +04001516 .mount = isofs_mount,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001517 .kill_sb = kill_block_super,
1518 .fs_flags = FS_REQUIRES_DEV,
1519};
Eric W. Biederman7f78e032013-03-02 19:39:14 -08001520MODULE_ALIAS_FS("iso9660");
Eric W. Biedermanfa7614dd2013-03-12 18:27:41 -07001521MODULE_ALIAS("iso9660");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001522
1523static int __init init_iso9660_fs(void)
1524{
1525 int err = init_inodecache();
1526 if (err)
1527 goto out;
1528#ifdef CONFIG_ZISOFS
1529 err = zisofs_init();
1530 if (err)
1531 goto out1;
1532#endif
1533 err = register_filesystem(&iso9660_fs_type);
1534 if (err)
1535 goto out2;
1536 return 0;
1537out2:
1538#ifdef CONFIG_ZISOFS
1539 zisofs_cleanup();
1540out1:
1541#endif
1542 destroy_inodecache();
1543out:
1544 return err;
1545}
1546
1547static void __exit exit_iso9660_fs(void)
1548{
1549 unregister_filesystem(&iso9660_fs_type);
1550#ifdef CONFIG_ZISOFS
1551 zisofs_cleanup();
1552#endif
1553 destroy_inodecache();
1554}
1555
1556module_init(init_iso9660_fs)
1557module_exit(exit_iso9660_fs)
1558MODULE_LICENSE("GPL");