blob: d9b8aebdeb22b467eb9717996b823734f8446300 [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
Nick Pigginb1e6a012011-01-07 17:49:28 +110031static int isofs_hashi(const struct dentry *parent, const struct inode *inode,
32 struct qstr *qstr);
33static int isofs_hash(const struct dentry *parent, const struct inode *inode,
34 struct qstr *qstr);
Nick Piggin621e1552011-01-07 17:49:27 +110035static int isofs_dentry_cmpi(const struct dentry *parent,
36 const struct inode *pinode,
37 const struct dentry *dentry, const struct inode *inode,
38 unsigned int len, const char *str, const struct qstr *name);
39static int isofs_dentry_cmp(const struct dentry *parent,
40 const struct inode *pinode,
41 const struct dentry *dentry, const struct inode *inode,
42 unsigned int len, const char *str, const struct qstr *name);
Linus Torvalds1da177e2005-04-16 15:20:36 -070043
44#ifdef CONFIG_JOLIET
Nick Pigginb1e6a012011-01-07 17:49:28 +110045static int isofs_hashi_ms(const struct dentry *parent, const struct inode *inode,
46 struct qstr *qstr);
47static int isofs_hash_ms(const struct dentry *parent, const struct inode *inode,
48 struct qstr *qstr);
Nick Piggin621e1552011-01-07 17:49:27 +110049static int isofs_dentry_cmpi_ms(const struct dentry *parent,
50 const struct inode *pinode,
51 const struct dentry *dentry, const struct inode *inode,
52 unsigned int len, const char *str, const struct qstr *name);
53static int isofs_dentry_cmp_ms(const struct dentry *parent,
54 const struct inode *pinode,
55 const struct dentry *dentry, const struct inode *inode,
56 unsigned int len, const char *str, const struct qstr *name);
Linus Torvalds1da177e2005-04-16 15:20:36 -070057#endif
58
59static void isofs_put_super(struct super_block *sb)
60{
61 struct isofs_sb_info *sbi = ISOFS_SB(sb);
Christoph Hellwig6cfd0142009-05-05 15:40:36 +020062
Linus Torvalds1da177e2005-04-16 15:20:36 -070063#ifdef CONFIG_JOLIET
Thomas Gleixner6d729e42009-08-16 21:05:08 +000064 unload_nls(sbi->s_nls_iocharset);
Linus Torvalds1da177e2005-04-16 15:20:36 -070065#endif
66
Linus Torvalds1da177e2005-04-16 15:20:36 -070067 kfree(sbi);
68 sb->s_fs_info = NULL;
69 return;
70}
71
David Howellsc4386c82008-02-07 00:15:41 -080072static int isofs_read_inode(struct inode *);
David Howells726c3342006-06-23 02:02:58 -070073static int isofs_statfs (struct dentry *, struct kstatfs *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070074
Christoph Lametere18b8902006-12-06 20:33:20 -080075static struct kmem_cache *isofs_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -070076
77static struct inode *isofs_alloc_inode(struct super_block *sb)
78{
79 struct iso_inode_info *ei;
Christoph Lametere94b1762006-12-06 20:33:17 -080080 ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 if (!ei)
82 return NULL;
83 return &ei->vfs_inode;
84}
85
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +110086static void isofs_i_callback(struct rcu_head *head)
87{
88 struct inode *inode = container_of(head, struct inode, i_rcu);
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +110089 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
90}
91
Linus Torvalds1da177e2005-04-16 15:20:36 -070092static void isofs_destroy_inode(struct inode *inode)
93{
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +110094 call_rcu(&inode->i_rcu, isofs_i_callback);
Linus Torvalds1da177e2005-04-16 15:20:36 -070095}
96
Alexey Dobriyan51cc5062008-07-25 19:45:34 -070097static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -070098{
Andrew Morton9eb7f2c2005-06-21 17:16:49 -070099 struct iso_inode_info *ei = foo;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100
Christoph Lametera35afb82007-05-16 22:10:57 -0700101 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102}
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700103
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104static int init_inodecache(void)
105{
106 isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700107 sizeof(struct iso_inode_info),
108 0, (SLAB_RECLAIM_ACCOUNT|
109 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +0900110 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 if (isofs_inode_cachep == NULL)
112 return -ENOMEM;
113 return 0;
114}
115
116static void destroy_inodecache(void)
117{
Kirill A. Shutemov8c0a8532012-09-26 11:33:07 +1000118 /*
119 * Make sure all delayed rcu free inodes are flushed before we
120 * destroy cache.
121 */
122 rcu_barrier();
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -0700123 kmem_cache_destroy(isofs_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124}
125
126static int isofs_remount(struct super_block *sb, int *flags, char *data)
127{
128 /* we probably want a lot more here */
129 *flags |= MS_RDONLY;
130 return 0;
131}
132
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800133static const struct super_operations isofs_sops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 .alloc_inode = isofs_alloc_inode,
135 .destroy_inode = isofs_destroy_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 .put_super = isofs_put_super,
137 .statfs = isofs_statfs,
138 .remount_fs = isofs_remount,
Miklos Szeredid0132ee2008-02-08 04:21:46 -0800139 .show_options = generic_show_options,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140};
141
142
Al Viroe16404e2009-02-20 05:55:13 +0000143static const struct dentry_operations isofs_dentry_ops[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 {
145 .d_hash = isofs_hash,
146 .d_compare = isofs_dentry_cmp,
147 },
148 {
149 .d_hash = isofs_hashi,
150 .d_compare = isofs_dentry_cmpi,
151 },
152#ifdef CONFIG_JOLIET
153 {
154 .d_hash = isofs_hash_ms,
155 .d_compare = isofs_dentry_cmp_ms,
156 },
157 {
158 .d_hash = isofs_hashi_ms,
159 .d_compare = isofs_dentry_cmpi_ms,
Andrew Morton9eb7f2c2005-06-21 17:16:49 -0700160 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161#endif
162};
163
164struct iso9660_options{
Jan Kara5404ac82009-06-17 16:26:27 -0700165 unsigned int rock:1;
Bartlomiej Zolnierkiewicz8711c672009-07-10 12:34:27 +0200166 unsigned int joliet:1;
Jan Kara5404ac82009-06-17 16:26:27 -0700167 unsigned int cruft:1;
168 unsigned int hide:1;
169 unsigned int showassoc:1;
170 unsigned int nocompress:1;
171 unsigned int overriderockperm:1;
172 unsigned int uid_set:1;
173 unsigned int gid_set:1;
174 unsigned int utf8:1;
175 unsigned char map;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 unsigned char check;
177 unsigned int blocksize;
Al Viro7328bdd2011-07-26 03:19:52 -0400178 umode_t fmode;
179 umode_t dmode;
Eric W. Biedermanba64e2b2012-02-10 11:35:50 -0800180 kgid_t gid;
181 kuid_t uid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 char *iocharset;
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700183 /* LVE */
184 s32 session;
185 s32 sbsector;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186};
187
188/*
189 * Compute the hash for the isofs name corresponding to the dentry.
190 */
191static int
Nick Pigginb1e6a012011-01-07 17:49:28 +1100192isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193{
194 const char *name;
195 int len;
196
197 len = qstr->len;
198 name = qstr->name;
199 if (ms) {
200 while (len && name[len-1] == '.')
201 len--;
202 }
203
204 qstr->hash = full_name_hash(name, len);
205
206 return 0;
207}
208
209/*
210 * Compute the hash for the isofs name corresponding to the dentry.
211 */
212static int
Nick Pigginb1e6a012011-01-07 17:49:28 +1100213isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214{
215 const char *name;
216 int len;
217 char c;
218 unsigned long hash;
219
220 len = qstr->len;
221 name = qstr->name;
222 if (ms) {
223 while (len && name[len-1] == '.')
224 len--;
225 }
226
227 hash = init_name_hash();
228 while (len--) {
229 c = tolower(*name++);
young davef17e1212007-07-15 23:40:17 -0700230 hash = partial_name_hash(c, hash);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 }
232 qstr->hash = end_name_hash(hash);
233
234 return 0;
235}
236
237/*
Nick Piggin621e1552011-01-07 17:49:27 +1100238 * Compare of two isofs names.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 */
Nick Piggin621e1552011-01-07 17:49:27 +1100240static int isofs_dentry_cmp_common(
241 unsigned int len, const char *str,
242 const struct qstr *name, int ms, int ci)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243{
244 int alen, blen;
245
246 /* A filename cannot end in '.' or we treat it like it has none */
Nick Piggin621e1552011-01-07 17:49:27 +1100247 alen = name->len;
248 blen = len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 if (ms) {
Nick Piggin621e1552011-01-07 17:49:27 +1100250 while (alen && name->name[alen-1] == '.')
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 alen--;
Nick Piggin621e1552011-01-07 17:49:27 +1100252 while (blen && str[blen-1] == '.')
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 blen--;
254 }
255 if (alen == blen) {
Nick Piggin621e1552011-01-07 17:49:27 +1100256 if (ci) {
257 if (strnicmp(name->name, str, alen) == 0)
258 return 0;
259 } else {
260 if (strncmp(name->name, str, alen) == 0)
261 return 0;
262 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700263 }
264 return 1;
265}
266
267static int
Nick Pigginb1e6a012011-01-07 17:49:28 +1100268isofs_hash(const struct dentry *dentry, const struct inode *inode,
269 struct qstr *qstr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270{
271 return isofs_hash_common(dentry, qstr, 0);
272}
273
274static int
Nick Pigginb1e6a012011-01-07 17:49:28 +1100275isofs_hashi(const struct dentry *dentry, const struct inode *inode,
276 struct qstr *qstr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277{
278 return isofs_hashi_common(dentry, qstr, 0);
279}
280
281static int
Nick Piggin621e1552011-01-07 17:49:27 +1100282isofs_dentry_cmp(const struct dentry *parent, const struct inode *pinode,
283 const struct dentry *dentry, const struct inode *inode,
284 unsigned int len, const char *str, const struct qstr *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285{
Nick Piggin621e1552011-01-07 17:49:27 +1100286 return isofs_dentry_cmp_common(len, str, name, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287}
288
289static int
Nick Piggin621e1552011-01-07 17:49:27 +1100290isofs_dentry_cmpi(const struct dentry *parent, const struct inode *pinode,
291 const struct dentry *dentry, const struct inode *inode,
292 unsigned int len, const char *str, const struct qstr *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293{
Nick Piggin621e1552011-01-07 17:49:27 +1100294 return isofs_dentry_cmp_common(len, str, name, 0, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295}
296
297#ifdef CONFIG_JOLIET
298static int
Nick Pigginb1e6a012011-01-07 17:49:28 +1100299isofs_hash_ms(const struct dentry *dentry, const struct inode *inode,
300 struct qstr *qstr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301{
302 return isofs_hash_common(dentry, qstr, 1);
303}
304
305static int
Nick Pigginb1e6a012011-01-07 17:49:28 +1100306isofs_hashi_ms(const struct dentry *dentry, const struct inode *inode,
307 struct qstr *qstr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308{
309 return isofs_hashi_common(dentry, qstr, 1);
310}
311
312static int
Nick Piggin621e1552011-01-07 17:49:27 +1100313isofs_dentry_cmp_ms(const struct dentry *parent, const struct inode *pinode,
314 const struct dentry *dentry, const struct inode *inode,
315 unsigned int len, const char *str, const struct qstr *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316{
Nick Piggin621e1552011-01-07 17:49:27 +1100317 return isofs_dentry_cmp_common(len, str, name, 1, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318}
319
320static int
Nick Piggin621e1552011-01-07 17:49:27 +1100321isofs_dentry_cmpi_ms(const struct dentry *parent, const struct inode *pinode,
322 const struct dentry *dentry, const struct inode *inode,
323 unsigned int len, const char *str, const struct qstr *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324{
Nick Piggin621e1552011-01-07 17:49:27 +1100325 return isofs_dentry_cmp_common(len, str, name, 1, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326}
327#endif
328
329enum {
330 Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
331 Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
332 Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
Jan Kara52b680c2009-06-17 16:26:25 -0700333 Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334};
335
Steven Whitehousea447c092008-10-13 10:46:57 +0100336static const match_table_t tokens = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 {Opt_norock, "norock"},
338 {Opt_nojoliet, "nojoliet"},
339 {Opt_unhide, "unhide"},
Jeremy White9769f4e2005-06-21 17:16:53 -0700340 {Opt_hide, "hide"},
341 {Opt_showassoc, "showassoc"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 {Opt_cruft, "cruft"},
343 {Opt_utf8, "utf8"},
344 {Opt_iocharset, "iocharset=%s"},
345 {Opt_map_a, "map=acorn"},
346 {Opt_map_a, "map=a"},
347 {Opt_map_n, "map=normal"},
348 {Opt_map_n, "map=n"},
349 {Opt_map_o, "map=off"},
350 {Opt_map_o, "map=o"},
351 {Opt_session, "session=%u"},
352 {Opt_sb, "sbsector=%u"},
353 {Opt_check_r, "check=relaxed"},
354 {Opt_check_r, "check=r"},
355 {Opt_check_s, "check=strict"},
356 {Opt_check_s, "check=s"},
357 {Opt_uid, "uid=%u"},
358 {Opt_gid, "gid=%u"},
359 {Opt_mode, "mode=%u"},
Jan Kara9b7880e2008-02-08 04:21:09 -0800360 {Opt_dmode, "dmode=%u"},
Jan Kara52b680c2009-06-17 16:26:25 -0700361 {Opt_overriderockperm, "overriderockperm"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 {Opt_block, "block=%u"},
363 {Opt_ignore, "conv=binary"},
364 {Opt_ignore, "conv=b"},
365 {Opt_ignore, "conv=text"},
366 {Opt_ignore, "conv=t"},
367 {Opt_ignore, "conv=mtext"},
368 {Opt_ignore, "conv=m"},
369 {Opt_ignore, "conv=auto"},
370 {Opt_ignore, "conv=a"},
371 {Opt_nocompress, "nocompress"},
372 {Opt_err, NULL}
373};
374
Andrew Morton9eb7f2c2005-06-21 17:16:49 -0700375static int parse_options(char *options, struct iso9660_options *popt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376{
377 char *p;
378 int option;
379
380 popt->map = 'n';
Jan Kara5404ac82009-06-17 16:26:27 -0700381 popt->rock = 1;
382 popt->joliet = 1;
383 popt->cruft = 0;
384 popt->hide = 0;
385 popt->showassoc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386 popt->check = 'u'; /* unset */
387 popt->nocompress = 0;
388 popt->blocksize = 1024;
Jan Kara52b680c2009-06-17 16:26:25 -0700389 popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
Jan Kara5c4a6562009-06-17 16:26:27 -0700390 popt->uid_set = 0;
391 popt->gid_set = 0;
Eric W. Biedermanba64e2b2012-02-10 11:35:50 -0800392 popt->gid = GLOBAL_ROOT_GID;
393 popt->uid = GLOBAL_ROOT_UID;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 popt->iocharset = NULL;
395 popt->utf8 = 0;
Jan Kara52b680c2009-06-17 16:26:25 -0700396 popt->overriderockperm = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397 popt->session=-1;
398 popt->sbsector=-1;
399 if (!options)
400 return 1;
401
402 while ((p = strsep(&options, ",")) != NULL) {
403 int token;
404 substring_t args[MAX_OPT_ARGS];
405 unsigned n;
406
407 if (!*p)
408 continue;
409
410 token = match_token(p, tokens, args);
411 switch (token) {
412 case Opt_norock:
Jan Kara5404ac82009-06-17 16:26:27 -0700413 popt->rock = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 break;
415 case Opt_nojoliet:
Jan Kara5404ac82009-06-17 16:26:27 -0700416 popt->joliet = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 break;
Jeremy White9769f4e2005-06-21 17:16:53 -0700418 case Opt_hide:
Jan Kara5404ac82009-06-17 16:26:27 -0700419 popt->hide = 1;
Jeremy White9769f4e2005-06-21 17:16:53 -0700420 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 case Opt_unhide:
Jeremy White9769f4e2005-06-21 17:16:53 -0700422 case Opt_showassoc:
Jan Kara5404ac82009-06-17 16:26:27 -0700423 popt->showassoc = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 break;
425 case Opt_cruft:
Jan Kara5404ac82009-06-17 16:26:27 -0700426 popt->cruft = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427 break;
428 case Opt_utf8:
429 popt->utf8 = 1;
430 break;
431#ifdef CONFIG_JOLIET
432 case Opt_iocharset:
433 popt->iocharset = match_strdup(&args[0]);
434 break;
435#endif
436 case Opt_map_a:
437 popt->map = 'a';
438 break;
439 case Opt_map_o:
440 popt->map = 'o';
441 break;
442 case Opt_map_n:
443 popt->map = 'n';
444 break;
445 case Opt_session:
446 if (match_int(&args[0], &option))
447 return 0;
448 n = option;
449 if (n > 99)
450 return 0;
451 popt->session = n + 1;
452 break;
453 case Opt_sb:
454 if (match_int(&args[0], &option))
455 return 0;
456 popt->sbsector = option;
457 break;
458 case Opt_check_r:
459 popt->check = 'r';
460 break;
461 case Opt_check_s:
462 popt->check = 's';
463 break;
464 case Opt_ignore:
465 break;
466 case Opt_uid:
467 if (match_int(&args[0], &option))
468 return 0;
Eric W. Biedermanba64e2b2012-02-10 11:35:50 -0800469 popt->uid = make_kuid(current_user_ns(), option);
470 if (!uid_valid(popt->uid))
471 return 0;
Jan Kara5c4a6562009-06-17 16:26:27 -0700472 popt->uid_set = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 break;
474 case Opt_gid:
475 if (match_int(&args[0], &option))
476 return 0;
Eric W. Biedermanba64e2b2012-02-10 11:35:50 -0800477 popt->gid = make_kgid(current_user_ns(), option);
478 if (!gid_valid(popt->gid))
479 return 0;
Jan Kara5c4a6562009-06-17 16:26:27 -0700480 popt->gid_set = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 break;
482 case Opt_mode:
483 if (match_int(&args[0], &option))
484 return 0;
Jan Kara9b7880e2008-02-08 04:21:09 -0800485 popt->fmode = option;
486 break;
487 case Opt_dmode:
488 if (match_int(&args[0], &option))
489 return 0;
490 popt->dmode = option;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491 break;
Jan Kara52b680c2009-06-17 16:26:25 -0700492 case Opt_overriderockperm:
493 popt->overriderockperm = 1;
494 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 case Opt_block:
496 if (match_int(&args[0], &option))
497 return 0;
498 n = option;
499 if (n != 512 && n != 1024 && n != 2048)
500 return 0;
501 popt->blocksize = n;
502 break;
503 case Opt_nocompress:
504 popt->nocompress = 1;
505 break;
506 default:
507 return 0;
508 }
509 }
510 return 1;
511}
512
513/*
514 * look if the driver can tell the multi session redirection value
515 *
516 * don't change this if you don't know what you do, please!
517 * Multisession is legal only with XA disks.
518 * A non-XA disk with more than one volume descriptor may do it right, but
519 * usually is written in a nowhere standardized "multi-partition" manner.
520 * Multisession uses absolute addressing (solely the first frame of the whole
521 * track is #0), multi-partition uses relative addressing (each first frame of
522 * each track is #0), and a track is not a session.
523 *
524 * A broken CDwriter software or drive firmware does not set new standards,
525 * at least not if conflicting with the existing ones.
526 *
527 * emoenke@gwdg.de
528 */
529#define WE_OBEY_THE_WRITTEN_STANDARDS 1
530
Andrew Morton9eb7f2c2005-06-21 17:16:49 -0700531static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532{
533 struct cdrom_multisession ms_info;
534 unsigned int vol_desc_start;
535 struct block_device *bdev = sb->s_bdev;
536 int i;
537
538 vol_desc_start=0;
539 ms_info.addr_format=CDROM_LBA;
540 if(session >= 0 && session <= 99) {
541 struct cdrom_tocentry Te;
542 Te.cdte_track=session;
543 Te.cdte_format=CDROM_LBA;
544 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
545 if (!i) {
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700546 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
547 session, Te.cdte_addr.lba,
548 Te.cdte_ctrl&CDROM_DATA_TRACK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
550 return Te.cdte_addr.lba;
551 }
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700552
553 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 }
555 i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
Andrew Morton9eb7f2c2005-06-21 17:16:49 -0700556 if (session > 0)
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700557 printk(KERN_ERR "ISOFS: Invalid session number\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558#if 0
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700559 printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 if (i==0) {
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700561 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
562 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563 }
564#endif
565 if (i==0)
566#if WE_OBEY_THE_WRITTEN_STANDARDS
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700567 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568#endif
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700569 vol_desc_start=ms_info.addr.lba;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 return vol_desc_start;
571}
572
573/*
Ondrej Zarye45c9ef2010-10-27 15:33:30 -0700574 * Check if root directory is empty (has less than 3 files).
575 *
576 * Used to detect broken CDs where ISO root directory is empty but Joliet root
577 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
578 * (and Joliet used instead) or else no files would be visible.
579 */
580static bool rootdir_empty(struct super_block *sb, unsigned long block)
581{
582 int offset = 0, files = 0, de_len;
583 struct iso_directory_record *de;
584 struct buffer_head *bh;
585
586 bh = sb_bread(sb, block);
587 if (!bh)
588 return true;
589 while (files < 3) {
590 de = (struct iso_directory_record *) (bh->b_data + offset);
591 de_len = *(unsigned char *) de;
592 if (de_len == 0)
593 break;
594 files++;
595 offset += de_len;
596 }
597 brelse(bh);
598 return files < 3;
599}
600
601/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602 * Initialize the superblock and read the root inode.
603 *
604 * Note: a check_disk_change() has been done immediately prior
605 * to this call, so we don't need to check again.
606 */
607static int isofs_fill_super(struct super_block *s, void *data, int silent)
608{
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700609 struct buffer_head *bh = NULL, *pri_bh = NULL;
610 struct hs_primary_descriptor *h_pri = NULL;
611 struct iso_primary_descriptor *pri = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612 struct iso_supplementary_descriptor *sec = NULL;
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700613 struct iso_directory_record *rootp;
614 struct inode *inode;
615 struct iso9660_options opt;
616 struct isofs_sb_info *sbi;
617 unsigned long first_data_zone;
618 int joliet_level = 0;
619 int iso_blknum, block;
620 int orig_zonesize;
David Howellsc4386c82008-02-07 00:15:41 -0800621 int table, error = -EINVAL;
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700622 unsigned int vol_desc_start;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623
Miklos Szeredid0132ee2008-02-08 04:21:46 -0800624 save_mount_options(s, data);
625
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700626 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
Arnd Bergmann4f819a72010-09-12 19:05:56 +0200627 if (!sbi)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 return -ENOMEM;
629 s->s_fs_info = sbi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630
Andrew Morton9eb7f2c2005-06-21 17:16:49 -0700631 if (!parse_options((char *)data, &opt))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632 goto out_freesbi;
633
634 /*
635 * First of all, get the hardware blocksize for this device.
636 * If we don't know what it is, or the hardware blocksize is
637 * larger than the blocksize the user specified, then use
638 * that value.
639 */
640 /*
641 * What if bugger tells us to go beyond page size?
642 */
643 opt.blocksize = sb_min_blocksize(s, opt.blocksize);
644
645 sbi->s_high_sierra = 0; /* default is iso9660 */
646
647 vol_desc_start = (opt.sbsector != -1) ?
648 opt.sbsector : isofs_get_last_session(s,opt.session);
649
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700650 for (iso_blknum = vol_desc_start+16;
651 iso_blknum < vol_desc_start+100; iso_blknum++) {
652 struct hs_volume_descriptor *hdp;
653 struct iso_volume_descriptor *vdp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700655 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
656 if (!(bh = sb_bread(s, block)))
657 goto out_no_read;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700659 vdp = (struct iso_volume_descriptor *)bh->b_data;
660 hdp = (struct hs_volume_descriptor *)bh->b_data;
661
662 /*
663 * Due to the overlapping physical location of the descriptors,
664 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
665 * proper identification in this case, we first check for ISO.
666 */
667 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
668 if (isonum_711(vdp->type) == ISO_VD_END)
669 break;
670 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
671 if (pri == NULL) {
672 pri = (struct iso_primary_descriptor *)vdp;
673 /* Save the buffer in case we need it ... */
674 pri_bh = bh;
675 bh = NULL;
676 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677 }
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700678#ifdef CONFIG_JOLIET
679 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
680 sec = (struct iso_supplementary_descriptor *)vdp;
681 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
Bartlomiej Zolnierkiewicz8711c672009-07-10 12:34:27 +0200682 if (opt.joliet) {
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700683 if (sec->escape[2] == 0x40)
684 joliet_level = 1;
685 else if (sec->escape[2] == 0x43)
686 joliet_level = 2;
687 else if (sec->escape[2] == 0x45)
688 joliet_level = 3;
689
690 printk(KERN_DEBUG "ISO 9660 Extensions: "
691 "Microsoft Joliet Level %d\n",
692 joliet_level);
693 }
694 goto root_found;
695 } else {
696 /* Unknown supplementary volume descriptor */
697 sec = NULL;
698 }
699 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700#endif
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700701 } else {
702 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
703 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
704 goto out_freebh;
705
706 sbi->s_high_sierra = 1;
Jan Kara5404ac82009-06-17 16:26:27 -0700707 opt.rock = 0;
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700708 h_pri = (struct hs_primary_descriptor *)vdp;
709 goto root_found;
710 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700712
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700713 /* Just skip any volume descriptors we don't recognize */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700714
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700715 brelse(bh);
716 bh = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717 }
718 /*
719 * If we fall through, either no volume descriptor was found,
720 * or else we passed a primary descriptor looking for others.
721 */
722 if (!pri)
723 goto out_unknown_format;
724 brelse(bh);
725 bh = pri_bh;
726 pri_bh = NULL;
727
728root_found:
729
Jan Kara5404ac82009-06-17 16:26:27 -0700730 if (joliet_level && (pri == NULL || !opt.rock)) {
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700731 /* This is the case of Joliet with the norock mount flag.
732 * A disc with both Joliet and Rock Ridge is handled later
733 */
734 pri = (struct iso_primary_descriptor *) sec;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700735 }
736
737 if(sbi->s_high_sierra){
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700738 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
739 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
740 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
741 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742 } else {
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700743 if (!pri)
744 goto out_freebh;
745 rootp = (struct iso_directory_record *) pri->root_directory_record;
746 sbi->s_nzones = isonum_733(pri->volume_space_size);
747 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
748 sbi->s_max_size = isonum_733(pri->volume_space_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700749 }
750
751 sbi->s_ninodes = 0; /* No way to figure this out easily */
752
753 orig_zonesize = sbi->s_log_zone_size;
754 /*
755 * If the zone size is smaller than the hardware sector size,
756 * this is a fatal error. This would occur if the disc drive
757 * had sectors that were 2048 bytes, but the filesystem had
758 * blocks that were 512 bytes (which should only very rarely
759 * happen.)
760 */
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700761 if (orig_zonesize < opt.blocksize)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762 goto out_bad_size;
763
764 /* RDE: convert log zone size to bit shift */
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700765 switch (sbi->s_log_zone_size) {
766 case 512: sbi->s_log_zone_size = 9; break;
767 case 1024: sbi->s_log_zone_size = 10; break;
768 case 2048: sbi->s_log_zone_size = 11; break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700770 default:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771 goto out_bad_zone_size;
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700772 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773
774 s->s_magic = ISOFS_SUPER_MAGIC;
Jan Andres66a362a2010-08-04 22:52:46 +0200775
776 /*
777 * With multi-extent files, file size is only limited by the maximum
778 * size of a file system, which is 8 TB.
779 */
780 s->s_maxbytes = 0x80000000000LL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700781
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700782 /*
783 * The CDROM is read-only, has no nodes (devices) on it, and since
784 * all of the files appear to be owned by root, we really do not want
785 * to allow suid. (suid or devices will not show up unless we have
786 * Rock Ridge extensions)
787 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788
789 s->s_flags |= MS_RDONLY /* | MS_NODEV | MS_NOSUID */;
790
791 /* Set this for reference. Its not currently used except on write
792 which we don't have .. */
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700793
794 first_data_zone = isonum_733(rootp->extent) +
795 isonum_711(rootp->ext_attr_length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796 sbi->s_firstdatazone = first_data_zone;
797#ifndef BEQUIET
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700798 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n",
799 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
800 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801 if(sbi->s_high_sierra)
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700802 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803#endif
804
805 /*
806 * If the Joliet level is set, we _may_ decide to use the
807 * secondary descriptor, but can't be sure until after we
808 * read the root inode. But before reading the root inode
809 * we may need to change the device blocksize, and would
810 * rather release the old buffer first. So, we cache the
811 * first_data_zone value from the secondary descriptor.
812 */
813 if (joliet_level) {
814 pri = (struct iso_primary_descriptor *) sec;
815 rootp = (struct iso_directory_record *)
816 pri->root_directory_record;
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700817 first_data_zone = isonum_733(rootp->extent) +
818 isonum_711(rootp->ext_attr_length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700819 }
820
821 /*
822 * We're all done using the volume descriptor, and may need
823 * to change the device blocksize, so release the buffer now.
824 */
825 brelse(pri_bh);
826 brelse(bh);
827
828 /*
829 * Force the blocksize to 512 for 512 byte sectors. The file
830 * read primitives really get it wrong in a bad way if we don't
831 * do this.
832 *
833 * Note - we should never be setting the blocksize to something
834 * less than the hardware sector size for the device. If we
835 * do, we would end up having to read larger buffers and split
836 * out portions to satisfy requests.
837 *
838 * Note2- the idea here is that we want to deal with the optimal
839 * zonesize in the filesystem. If we have it set to something less,
840 * then we have horrible problems with trying to piece together
841 * bits of adjacent blocks in order to properly read directory
842 * entries. By forcing the blocksize in this way, we ensure
843 * that we will never be required to do this.
844 */
845 sb_set_blocksize(s, orig_zonesize);
846
847 sbi->s_nls_iocharset = NULL;
848
849#ifdef CONFIG_JOLIET
850 if (joliet_level && opt.utf8 == 0) {
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700851 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852 sbi->s_nls_iocharset = load_nls(p);
853 if (! sbi->s_nls_iocharset) {
854 /* Fail only if explicit charset specified */
855 if (opt.iocharset)
856 goto out_freesbi;
857 sbi->s_nls_iocharset = load_nls_default();
858 }
859 }
860#endif
861 s->s_op = &isofs_sops;
862 s->s_export_op = &isofs_export_ops;
863 sbi->s_mapping = opt.map;
Jan Kara5404ac82009-06-17 16:26:27 -0700864 sbi->s_rock = (opt.rock ? 2 : 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700865 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
866 sbi->s_cruft = opt.cruft;
Jeremy White9769f4e2005-06-21 17:16:53 -0700867 sbi->s_hide = opt.hide;
868 sbi->s_showassoc = opt.showassoc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869 sbi->s_uid = opt.uid;
870 sbi->s_gid = opt.gid;
Jan Kara5c4a6562009-06-17 16:26:27 -0700871 sbi->s_uid_set = opt.uid_set;
872 sbi->s_gid_set = opt.gid_set;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873 sbi->s_utf8 = opt.utf8;
874 sbi->s_nocompress = opt.nocompress;
Jan Kara52b680c2009-06-17 16:26:25 -0700875 sbi->s_overriderockperm = opt.overriderockperm;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700876 /*
877 * It would be incredibly stupid to allow people to mark every file
878 * on the disk as suid, so we merely allow them to set the default
879 * permissions.
880 */
Jan Kara52b680c2009-06-17 16:26:25 -0700881 if (opt.fmode != ISOFS_INVALID_MODE)
882 sbi->s_fmode = opt.fmode & 0777;
883 else
884 sbi->s_fmode = ISOFS_INVALID_MODE;
885 if (opt.dmode != ISOFS_INVALID_MODE)
886 sbi->s_dmode = opt.dmode & 0777;
887 else
888 sbi->s_dmode = ISOFS_INVALID_MODE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889
890 /*
891 * Read the root inode, which _may_ result in changing
892 * the s_rock flag. Once we have the final s_rock value,
893 * we then decide whether to use the Joliet descriptor.
894 */
895 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
David Howellsc4386c82008-02-07 00:15:41 -0800896 if (IS_ERR(inode))
897 goto out_no_root;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700898
899 /*
Ondrej Zarye45c9ef2010-10-27 15:33:30 -0700900 * Fix for broken CDs with Rock Ridge and empty ISO root directory but
901 * correct Joliet root directory.
902 */
903 if (sbi->s_rock == 1 && joliet_level &&
904 rootdir_empty(s, sbi->s_firstdatazone)) {
905 printk(KERN_NOTICE
906 "ISOFS: primary root directory is empty. "
907 "Disabling Rock Ridge and switching to Joliet.");
908 sbi->s_rock = 0;
909 }
910
911 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700912 * If this disk has both Rock Ridge and Joliet on it, then we
913 * want to use Rock Ridge by default. This can be overridden
914 * by using the norock mount option. There is still one other
915 * possibility that is not taken into account: a Rock Ridge
916 * CD with Unicode names. Until someone sees such a beast, it
917 * will not be supported.
918 */
919 if (sbi->s_rock == 1) {
920 joliet_level = 0;
921 } else if (joliet_level) {
922 sbi->s_rock = 0;
923 if (sbi->s_firstdatazone != first_data_zone) {
924 sbi->s_firstdatazone = first_data_zone;
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700925 printk(KERN_DEBUG
Linus Torvalds1da177e2005-04-16 15:20:36 -0700926 "ISOFS: changing to secondary root\n");
927 iput(inode);
928 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
David Howellsc4386c82008-02-07 00:15:41 -0800929 if (IS_ERR(inode))
930 goto out_no_root;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931 }
932 }
933
934 if (opt.check == 'u') {
935 /* Only Joliet is case insensitive by default */
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700936 if (joliet_level)
937 opt.check = 'r';
938 else
939 opt.check = 's';
Linus Torvalds1da177e2005-04-16 15:20:36 -0700940 }
941 sbi->s_joliet_level = joliet_level;
942
Kirill Kuvaldin817794e2007-07-31 00:38:58 -0700943 /* Make sure the root inode is a directory */
944 if (!S_ISDIR(inode->i_mode)) {
945 printk(KERN_WARNING
946 "isofs_fill_super: root inode is not a directory. "
947 "Corrupted media?\n");
948 goto out_iput;
949 }
950
Linus Torvalds1da177e2005-04-16 15:20:36 -0700951 table = 0;
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700952 if (joliet_level)
953 table += 2;
954 if (opt.check == 'r')
955 table++;
Al Viro6cc9c1d2010-12-18 10:29:26 -0500956
957 s->s_d_op = &isofs_dentry_ops[table];
958
959 /* get the root dentry */
Al Viro48fde702012-01-08 22:15:13 -0500960 s->s_root = d_make_root(inode);
Al Viro8fdd8c42012-01-09 10:48:11 -0500961 if (!(s->s_root)) {
Al Viro8fdd8c42012-01-09 10:48:11 -0500962 error = -ENOMEM;
963 goto out_no_inode;
964 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700965
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800966 kfree(opt.iocharset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700967
968 return 0;
969
970 /*
971 * Display error messages and free resources.
972 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700973out_iput:
974 iput(inode);
David Howellsc4386c82008-02-07 00:15:41 -0800975 goto out_no_inode;
976out_no_root:
977 error = PTR_ERR(inode);
978 if (error != -ENOMEM)
979 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
980out_no_inode:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700981#ifdef CONFIG_JOLIET
Thomas Gleixner6d729e42009-08-16 21:05:08 +0000982 unload_nls(sbi->s_nls_iocharset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700983#endif
984 goto out_freesbi;
985out_no_read:
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700986 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
987 __func__, s->s_id, iso_blknum, block);
Linus Torvaldsc11760c2011-06-08 10:30:03 -0700988 goto out_freebh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989out_bad_zone_size:
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700990 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991 sbi->s_log_zone_size);
992 goto out_freebh;
993out_bad_size:
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700994 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995 orig_zonesize, opt.blocksize);
996 goto out_freebh;
997out_unknown_format:
998 if (!silent)
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700999 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000
1001out_freebh:
1002 brelse(bh);
Linus Torvaldsc11760c2011-06-08 10:30:03 -07001003 brelse(pri_bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001004out_freesbi:
Jesper Juhlf99d49a2005-11-07 01:01:34 -08001005 kfree(opt.iocharset);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001006 kfree(sbi);
1007 s->s_fs_info = NULL;
David Howellsc4386c82008-02-07 00:15:41 -08001008 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009}
1010
David Howells726c3342006-06-23 02:02:58 -07001011static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001012{
David Howells726c3342006-06-23 02:02:58 -07001013 struct super_block *sb = dentry->d_sb;
Coly Li2430c4d2009-04-02 16:59:38 -07001014 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
David Howells726c3342006-06-23 02:02:58 -07001015
Linus Torvalds1da177e2005-04-16 15:20:36 -07001016 buf->f_type = ISOFS_SUPER_MAGIC;
1017 buf->f_bsize = sb->s_blocksize;
1018 buf->f_blocks = (ISOFS_SB(sb)->s_nzones
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001019 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001020 buf->f_bfree = 0;
1021 buf->f_bavail = 0;
1022 buf->f_files = ISOFS_SB(sb)->s_ninodes;
1023 buf->f_ffree = 0;
Coly Li2430c4d2009-04-02 16:59:38 -07001024 buf->f_fsid.val[0] = (u32)id;
1025 buf->f_fsid.val[1] = (u32)(id >> 32);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001026 buf->f_namelen = NAME_MAX;
1027 return 0;
1028}
1029
1030/*
1031 * Get a set of blocks; filling in buffer_heads if already allocated
1032 * or getblk() if they are not. Returns the number of blocks inserted
David Howellsc4386c82008-02-07 00:15:41 -08001033 * (-ve == error.)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034 */
Jan Karafde214d2010-10-04 11:37:37 +02001035int isofs_get_blocks(struct inode *inode, sector_t iblock,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001036 struct buffer_head **bh, unsigned long nblocks)
1037{
Jan Karafde214d2010-10-04 11:37:37 +02001038 unsigned long b_off = iblock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001039 unsigned offset, sect_size;
1040 unsigned int firstext;
1041 unsigned long nextblk, nextoff;
David Howellsc4386c82008-02-07 00:15:41 -08001042 int section, rv, error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001043 struct iso_inode_info *ei = ISOFS_I(inode);
1044
David Howellsc4386c82008-02-07 00:15:41 -08001045 error = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001046 rv = 0;
Jan Karafde214d2010-10-04 11:37:37 +02001047 if (iblock != b_off) {
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001048 printk(KERN_DEBUG "%s: block number too large\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001049 goto abort;
1050 }
1051
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001053 offset = 0;
1054 firstext = ei->i_first_extent;
1055 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
1056 nextblk = ei->i_next_section_block;
1057 nextoff = ei->i_next_section_offset;
1058 section = 0;
1059
1060 while (nblocks) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061 /* If we are *way* beyond the end of the file, print a message.
1062 * Access beyond the end of the file up to the next page boundary
1063 * is normal, however because of the way the page cache works.
1064 * In this case, we just return 0 so that we can properly fill
1065 * the page with useless information without generating any
1066 * I/O errors.
1067 */
1068 if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
Jan Karafde214d2010-10-04 11:37:37 +02001069 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
1070 __func__, b_off,
1071 (unsigned long long)inode->i_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001072 goto abort;
1073 }
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001074
Joel & Rebecca VanderZeefb50ae72006-09-29 02:00:30 -07001075 /* On the last section, nextblk == 0, section size is likely to
1076 * exceed sect_size by a partial block, and access beyond the
1077 * end of the file will reach beyond the section size, too.
1078 */
1079 while (nextblk && (b_off >= (offset + sect_size))) {
1080 struct inode *ninode;
1081
1082 offset += sect_size;
1083 ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
David Howellsc4386c82008-02-07 00:15:41 -08001084 if (IS_ERR(ninode)) {
1085 error = PTR_ERR(ninode);
Joel & Rebecca VanderZeefb50ae72006-09-29 02:00:30 -07001086 goto abort;
David Howellsc4386c82008-02-07 00:15:41 -08001087 }
Joel & Rebecca VanderZeefb50ae72006-09-29 02:00:30 -07001088 firstext = ISOFS_I(ninode)->i_first_extent;
1089 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1090 nextblk = ISOFS_I(ninode)->i_next_section_block;
1091 nextoff = ISOFS_I(ninode)->i_next_section_offset;
1092 iput(ninode);
1093
1094 if (++section > 100) {
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001095 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1096 " aborting...\n", __func__);
Jan Karafde214d2010-10-04 11:37:37 +02001097 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001098 "nextblk=%lu nextoff=%lu\n", __func__,
Jan Karafde214d2010-10-04 11:37:37 +02001099 b_off, firstext, (unsigned) sect_size,
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001100 nextblk, nextoff);
Joel & Rebecca VanderZeefb50ae72006-09-29 02:00:30 -07001101 goto abort;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001102 }
1103 }
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001104
1105 if (*bh) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001106 map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1107 } else {
1108 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001109 if (!*bh)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110 goto abort;
1111 }
1112 bh++; /* Next buffer head */
1113 b_off++; /* Next buffer offset */
1114 nblocks--;
1115 rv++;
1116 }
1117
David Howellsc4386c82008-02-07 00:15:41 -08001118 error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001119abort:
David Howellsc4386c82008-02-07 00:15:41 -08001120 return rv != 0 ? rv : error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001121}
1122
1123/*
1124 * Used by the standard interfaces.
1125 */
1126static int isofs_get_block(struct inode *inode, sector_t iblock,
1127 struct buffer_head *bh_result, int create)
1128{
David Howellsc4386c82008-02-07 00:15:41 -08001129 int ret;
1130
Andrew Morton9eb7f2c2005-06-21 17:16:49 -07001131 if (create) {
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001132 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001133 return -EROFS;
1134 }
1135
David Howellsc4386c82008-02-07 00:15:41 -08001136 ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1137 return ret < 0 ? ret : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001138}
1139
1140static int isofs_bmap(struct inode *inode, sector_t block)
1141{
1142 struct buffer_head dummy;
1143 int error;
1144
1145 dummy.b_state = 0;
1146 dummy.b_blocknr = -1000;
1147 error = isofs_get_block(inode, block, &dummy, 0);
1148 if (!error)
1149 return dummy.b_blocknr;
1150 return 0;
1151}
1152
1153struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1154{
1155 sector_t blknr = isofs_bmap(inode, block);
1156 if (!blknr)
1157 return NULL;
1158 return sb_bread(inode->i_sb, blknr);
1159}
1160
1161static int isofs_readpage(struct file *file, struct page *page)
1162{
Namjae Jeon30690832011-11-02 13:38:00 -07001163 return mpage_readpage(page, isofs_get_block);
1164}
1165
1166static int isofs_readpages(struct file *file, struct address_space *mapping,
1167 struct list_head *pages, unsigned nr_pages)
1168{
1169 return mpage_readpages(mapping, pages, nr_pages, isofs_get_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001170}
1171
1172static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1173{
1174 return generic_block_bmap(mapping,block,isofs_get_block);
1175}
1176
Christoph Hellwigf5e54d62006-06-28 04:26:44 -07001177static const struct address_space_operations isofs_aops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001178 .readpage = isofs_readpage,
Namjae Jeon30690832011-11-02 13:38:00 -07001179 .readpages = isofs_readpages,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001180 .bmap = _isofs_bmap
1181};
1182
Andrew Morton9eb7f2c2005-06-21 17:16:49 -07001183static int isofs_read_level3_size(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001184{
1185 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1186 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001187 struct buffer_head *bh = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001188 unsigned long block, offset, block_saved, offset_saved;
1189 int i = 0;
1190 int more_entries = 0;
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001191 struct iso_directory_record *tmpde = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001192 struct iso_inode_info *ei = ISOFS_I(inode);
1193
1194 inode->i_size = 0;
1195
1196 /* The first 16 blocks are reserved as the System Area. Thus,
1197 * no inodes can appear in block 0. We use this to flag that
1198 * this is the last section. */
1199 ei->i_next_section_block = 0;
1200 ei->i_next_section_offset = 0;
1201
1202 block = ei->i_iget5_block;
1203 offset = ei->i_iget5_offset;
1204
1205 do {
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001206 struct iso_directory_record *de;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001207 unsigned int de_len;
1208
1209 if (!bh) {
1210 bh = sb_bread(inode->i_sb, block);
1211 if (!bh)
1212 goto out_noread;
1213 }
1214 de = (struct iso_directory_record *) (bh->b_data + offset);
1215 de_len = *(unsigned char *) de;
1216
1217 if (de_len == 0) {
1218 brelse(bh);
1219 bh = NULL;
1220 ++block;
1221 offset = 0;
1222 continue;
1223 }
1224
1225 block_saved = block;
1226 offset_saved = offset;
1227 offset += de_len;
1228
1229 /* Make sure we have a full directory entry */
1230 if (offset >= bufsize) {
1231 int slop = bufsize - offset + de_len;
1232 if (!tmpde) {
1233 tmpde = kmalloc(256, GFP_KERNEL);
1234 if (!tmpde)
1235 goto out_nomem;
1236 }
1237 memcpy(tmpde, de, slop);
1238 offset &= bufsize - 1;
1239 block++;
1240 brelse(bh);
1241 bh = NULL;
1242 if (offset) {
1243 bh = sb_bread(inode->i_sb, block);
1244 if (!bh)
1245 goto out_noread;
Andrew Morton9eb7f2c2005-06-21 17:16:49 -07001246 memcpy((void *)tmpde+slop, bh->b_data, offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001247 }
1248 de = tmpde;
1249 }
1250
1251 inode->i_size += isonum_733(de->size);
1252 if (i == 1) {
1253 ei->i_next_section_block = block_saved;
1254 ei->i_next_section_offset = offset_saved;
1255 }
1256
1257 more_entries = de->flags[-high_sierra] & 0x80;
1258
1259 i++;
Andrew Morton9eb7f2c2005-06-21 17:16:49 -07001260 if (i > 100)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001261 goto out_toomany;
Andrew Morton9eb7f2c2005-06-21 17:16:49 -07001262 } while (more_entries);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001263out:
Andrew Morton9eb7f2c2005-06-21 17:16:49 -07001264 kfree(tmpde);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001265 if (bh)
1266 brelse(bh);
1267 return 0;
1268
1269out_nomem:
1270 if (bh)
1271 brelse(bh);
1272 return -ENOMEM;
1273
1274out_noread:
1275 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
Jesper Juhlf99d49a2005-11-07 01:01:34 -08001276 kfree(tmpde);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001277 return -EIO;
1278
1279out_toomany:
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001280 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1281 "isofs_read_level3_size: inode=%lu\n",
1282 __func__, inode->i_ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001283 goto out;
1284}
1285
David Howellsc4386c82008-02-07 00:15:41 -08001286static int isofs_read_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001287{
1288 struct super_block *sb = inode->i_sb;
1289 struct isofs_sb_info *sbi = ISOFS_SB(sb);
1290 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1291 unsigned long block;
1292 int high_sierra = sbi->s_high_sierra;
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001293 struct buffer_head *bh = NULL;
1294 struct iso_directory_record *de;
1295 struct iso_directory_record *tmpde = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001296 unsigned int de_len;
1297 unsigned long offset;
1298 struct iso_inode_info *ei = ISOFS_I(inode);
David Howellsc4386c82008-02-07 00:15:41 -08001299 int ret = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001300
1301 block = ei->i_iget5_block;
1302 bh = sb_bread(inode->i_sb, block);
1303 if (!bh)
1304 goto out_badread;
1305
1306 offset = ei->i_iget5_offset;
1307
1308 de = (struct iso_directory_record *) (bh->b_data + offset);
1309 de_len = *(unsigned char *) de;
1310
1311 if (offset + de_len > bufsize) {
1312 int frag1 = bufsize - offset;
1313
1314 tmpde = kmalloc(de_len, GFP_KERNEL);
1315 if (tmpde == NULL) {
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001316 printk(KERN_INFO "%s: out of memory\n", __func__);
David Howellsc4386c82008-02-07 00:15:41 -08001317 ret = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001318 goto fail;
1319 }
1320 memcpy(tmpde, bh->b_data + offset, frag1);
1321 brelse(bh);
1322 bh = sb_bread(inode->i_sb, ++block);
1323 if (!bh)
1324 goto out_badread;
1325 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1326 de = tmpde;
1327 }
1328
1329 inode->i_ino = isofs_get_ino(ei->i_iget5_block,
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001330 ei->i_iget5_offset,
1331 ISOFS_BUFFER_BITS(inode));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001332
1333 /* Assume it is a normal-format file unless told otherwise */
1334 ei->i_file_format = isofs_file_normal;
1335
1336 if (de->flags[-high_sierra] & 2) {
Jan Kara52b680c2009-06-17 16:26:25 -07001337 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1338 inode->i_mode = S_IFDIR | sbi->s_dmode;
1339 else
1340 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
Miklos Szeredibfe86842011-10-28 14:13:29 +02001341 set_nlink(inode, 1); /*
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001342 * Set to 1. We know there are 2, but
1343 * the find utility tries to optimize
1344 * if it is 2, and it screws up. It is
1345 * easier to give 1 which tells find to
1346 * do it the hard way.
1347 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001348 } else {
Jan Kara52b680c2009-06-17 16:26:25 -07001349 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1350 inode->i_mode = S_IFREG | sbi->s_fmode;
1351 } else {
1352 /*
1353 * Set default permissions: r-x for all. The disc
1354 * could be shared with DOS machines so virtually
1355 * anything could be a valid executable.
1356 */
1357 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1358 }
Miklos Szeredibfe86842011-10-28 14:13:29 +02001359 set_nlink(inode, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001360 }
1361 inode->i_uid = sbi->s_uid;
1362 inode->i_gid = sbi->s_gid;
Theodore Ts'oba52de12006-09-27 01:50:49 -07001363 inode->i_blocks = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001364
1365 ei->i_format_parm[0] = 0;
1366 ei->i_format_parm[1] = 0;
1367 ei->i_format_parm[2] = 0;
1368
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001369 ei->i_section_size = isonum_733(de->size);
Andrew Morton9eb7f2c2005-06-21 17:16:49 -07001370 if (de->flags[-high_sierra] & 0x80) {
David Howellsc4386c82008-02-07 00:15:41 -08001371 ret = isofs_read_level3_size(inode);
1372 if (ret < 0)
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001373 goto fail;
David Howellsc4386c82008-02-07 00:15:41 -08001374 ret = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001375 } else {
1376 ei->i_next_section_block = 0;
1377 ei->i_next_section_offset = 0;
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001378 inode->i_size = isonum_733(de->size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379 }
1380
1381 /*
1382 * Some dipshit decided to store some other bit of information
1383 * in the high byte of the file length. Truncate size in case
1384 * this CDROM was mounted with the cruft option.
1385 */
1386
Jan Kara5404ac82009-06-17 16:26:27 -07001387 if (sbi->s_cruft)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001388 inode->i_size &= 0x00ffffff;
1389
1390 if (de->interleave[0]) {
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001391 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001392 inode->i_size = 0;
1393 }
1394
1395 /* I have no idea what file_unit_size is used for, so
1396 we will flag it for now */
1397 if (de->file_unit_size[0] != 0) {
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001398 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1399 inode->i_ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001400 }
1401
1402 /* I have no idea what other flag bits are used for, so
1403 we will flag it for now */
1404#ifdef DEBUG
1405 if((de->flags[-high_sierra] & ~2)!= 0){
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001406 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1407 "(%ld %x).\n",
1408 inode->i_ino, de->flags[-high_sierra]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001409 }
1410#endif
1411
1412 inode->i_mtime.tv_sec =
1413 inode->i_atime.tv_sec =
1414 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1415 inode->i_mtime.tv_nsec =
1416 inode->i_atime.tv_nsec =
1417 inode->i_ctime.tv_nsec = 0;
1418
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001419 ei->i_first_extent = (isonum_733(de->extent) +
1420 isonum_711(de->ext_attr_length));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001421
1422 /* Set the number of blocks for stat() - should be done before RR */
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001423 inode->i_blocks = (inode->i_size + 511) >> 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001424
1425 /*
1426 * Now test for possible Rock Ridge extensions which will override
1427 * some of these numbers in the inode structure.
1428 */
1429
1430 if (!high_sierra) {
1431 parse_rock_ridge_inode(de, inode);
1432 /* if we want uid/gid set, override the rock ridge setting */
Jan Kara5c4a6562009-06-17 16:26:27 -07001433 if (sbi->s_uid_set)
1434 inode->i_uid = sbi->s_uid;
1435 if (sbi->s_gid_set)
1436 inode->i_gid = sbi->s_gid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001437 }
Jan Kara52b680c2009-06-17 16:26:25 -07001438 /* Now set final access rights if overriding rock ridge setting */
1439 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1440 sbi->s_dmode != ISOFS_INVALID_MODE)
1441 inode->i_mode = S_IFDIR | sbi->s_dmode;
1442 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1443 sbi->s_fmode != ISOFS_INVALID_MODE)
1444 inode->i_mode = S_IFREG | sbi->s_fmode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001445
1446 /* Install the inode operations vector */
1447 if (S_ISREG(inode->i_mode)) {
1448 inode->i_fop = &generic_ro_fops;
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001449 switch (ei->i_file_format) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001450#ifdef CONFIG_ZISOFS
1451 case isofs_file_compressed:
1452 inode->i_data.a_ops = &zisofs_aops;
1453 break;
1454#endif
1455 default:
1456 inode->i_data.a_ops = &isofs_aops;
1457 break;
1458 }
1459 } else if (S_ISDIR(inode->i_mode)) {
1460 inode->i_op = &isofs_dir_inode_operations;
1461 inode->i_fop = &isofs_dir_operations;
1462 } else if (S_ISLNK(inode->i_mode)) {
1463 inode->i_op = &page_symlink_inode_operations;
1464 inode->i_data.a_ops = &isofs_symlink_aops;
1465 } else
1466 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1467 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1468
David Howellsc4386c82008-02-07 00:15:41 -08001469 ret = 0;
Andrew Morton9eb7f2c2005-06-21 17:16:49 -07001470out:
Jesper Juhlf99d49a2005-11-07 01:01:34 -08001471 kfree(tmpde);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001472 if (bh)
1473 brelse(bh);
David Howellsc4386c82008-02-07 00:15:41 -08001474 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001475
Andrew Morton9eb7f2c2005-06-21 17:16:49 -07001476out_badread:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001477 printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
Andrew Morton9eb7f2c2005-06-21 17:16:49 -07001478fail:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001479 goto out;
1480}
1481
1482struct isofs_iget5_callback_data {
1483 unsigned long block;
1484 unsigned long offset;
1485};
1486
1487static int isofs_iget5_test(struct inode *ino, void *data)
1488{
1489 struct iso_inode_info *i = ISOFS_I(ino);
1490 struct isofs_iget5_callback_data *d =
1491 (struct isofs_iget5_callback_data*)data;
1492 return (i->i_iget5_block == d->block)
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001493 && (i->i_iget5_offset == d->offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001494}
1495
1496static int isofs_iget5_set(struct inode *ino, void *data)
1497{
1498 struct iso_inode_info *i = ISOFS_I(ino);
1499 struct isofs_iget5_callback_data *d =
1500 (struct isofs_iget5_callback_data*)data;
1501 i->i_iget5_block = d->block;
1502 i->i_iget5_offset = d->offset;
1503 return 0;
1504}
1505
1506/* Store, in the inode's containing structure, the block and block
1507 * offset that point to the underlying meta-data for the inode. The
1508 * code below is otherwise similar to the iget() code in
1509 * include/linux/fs.h */
1510struct inode *isofs_iget(struct super_block *sb,
1511 unsigned long block,
1512 unsigned long offset)
1513{
1514 unsigned long hashval;
1515 struct inode *inode;
1516 struct isofs_iget5_callback_data data;
David Howellsc4386c82008-02-07 00:15:41 -08001517 long ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001518
1519 if (offset >= 1ul << sb->s_blocksize_bits)
David Howellsc4386c82008-02-07 00:15:41 -08001520 return ERR_PTR(-EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001521
1522 data.block = block;
1523 data.offset = offset;
1524
1525 hashval = (block << sb->s_blocksize_bits) | offset;
1526
Andrew Morton9eb7f2c2005-06-21 17:16:49 -07001527 inode = iget5_locked(sb, hashval, &isofs_iget5_test,
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001528 &isofs_iget5_set, &data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001529
David Howellsc4386c82008-02-07 00:15:41 -08001530 if (!inode)
1531 return ERR_PTR(-ENOMEM);
1532
1533 if (inode->i_state & I_NEW) {
1534 ret = isofs_read_inode(inode);
1535 if (ret < 0) {
1536 iget_failed(inode);
1537 inode = ERR_PTR(ret);
1538 } else {
1539 unlock_new_inode(inode);
1540 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001541 }
1542
1543 return inode;
1544}
1545
Al Viro152a0832010-07-25 00:46:55 +04001546static struct dentry *isofs_mount(struct file_system_type *fs_type,
1547 int flags, const char *dev_name, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001548{
Al Viro152a0832010-07-25 00:46:55 +04001549 return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001550}
1551
1552static struct file_system_type iso9660_fs_type = {
1553 .owner = THIS_MODULE,
1554 .name = "iso9660",
Al Viro152a0832010-07-25 00:46:55 +04001555 .mount = isofs_mount,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001556 .kill_sb = kill_block_super,
1557 .fs_flags = FS_REQUIRES_DEV,
1558};
Eric W. Biederman7f78e032013-03-02 19:39:14 -08001559MODULE_ALIAS_FS("iso9660");
Eric W. Biedermanfa7614dd2013-03-12 18:27:41 -07001560MODULE_ALIAS("iso9660");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001561
1562static int __init init_iso9660_fs(void)
1563{
1564 int err = init_inodecache();
1565 if (err)
1566 goto out;
1567#ifdef CONFIG_ZISOFS
1568 err = zisofs_init();
1569 if (err)
1570 goto out1;
1571#endif
1572 err = register_filesystem(&iso9660_fs_type);
1573 if (err)
1574 goto out2;
1575 return 0;
1576out2:
1577#ifdef CONFIG_ZISOFS
1578 zisofs_cleanup();
1579out1:
1580#endif
1581 destroy_inodecache();
1582out:
1583 return err;
1584}
1585
1586static void __exit exit_iso9660_fs(void)
1587{
1588 unregister_filesystem(&iso9660_fs_type);
1589#ifdef CONFIG_ZISOFS
1590 zisofs_cleanup();
1591#endif
1592 destroy_inodecache();
1593}
1594
1595module_init(init_iso9660_fs)
1596module_exit(exit_iso9660_fs)
1597MODULE_LICENSE("GPL");