blob: bd62c76fb5df8a08d8d11bdae311ecc8a3054039 [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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024
Al Viro94f2f7152005-04-25 18:32:12 -070025#include "isofs.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include "zisofs.h"
27
28#define BEQUIET
29
Nick Pigginb1e6a012011-01-07 17:49:28 +110030static int isofs_hashi(const struct dentry *parent, const struct inode *inode,
31 struct qstr *qstr);
32static int isofs_hash(const struct dentry *parent, const struct inode *inode,
33 struct qstr *qstr);
Nick Piggin621e1552011-01-07 17:49:27 +110034static int isofs_dentry_cmpi(const struct dentry *parent,
35 const struct inode *pinode,
36 const struct dentry *dentry, const struct inode *inode,
37 unsigned int len, const char *str, const struct qstr *name);
38static int isofs_dentry_cmp(const struct dentry *parent,
39 const struct inode *pinode,
40 const struct dentry *dentry, const struct inode *inode,
41 unsigned int len, const char *str, const struct qstr *name);
Linus Torvalds1da177e2005-04-16 15:20:36 -070042
43#ifdef CONFIG_JOLIET
Nick Pigginb1e6a012011-01-07 17:49:28 +110044static int isofs_hashi_ms(const struct dentry *parent, const struct inode *inode,
45 struct qstr *qstr);
46static int isofs_hash_ms(const struct dentry *parent, const struct inode *inode,
47 struct qstr *qstr);
Nick Piggin621e1552011-01-07 17:49:27 +110048static int isofs_dentry_cmpi_ms(const struct dentry *parent,
49 const struct inode *pinode,
50 const struct dentry *dentry, const struct inode *inode,
51 unsigned int len, const char *str, const struct qstr *name);
52static int isofs_dentry_cmp_ms(const struct dentry *parent,
53 const struct inode *pinode,
54 const struct dentry *dentry, const struct inode *inode,
55 unsigned int len, const char *str, const struct qstr *name);
Linus Torvalds1da177e2005-04-16 15:20:36 -070056#endif
57
58static void isofs_put_super(struct super_block *sb)
59{
60 struct isofs_sb_info *sbi = ISOFS_SB(sb);
Christoph Hellwig6cfd0142009-05-05 15:40:36 +020061
Linus Torvalds1da177e2005-04-16 15:20:36 -070062#ifdef CONFIG_JOLIET
Thomas Gleixner6d729e42009-08-16 21:05:08 +000063 unload_nls(sbi->s_nls_iocharset);
Linus Torvalds1da177e2005-04-16 15:20:36 -070064#endif
65
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 kfree(sbi);
67 sb->s_fs_info = NULL;
68 return;
69}
70
David Howellsc4386c82008-02-07 00:15:41 -080071static int isofs_read_inode(struct inode *);
David Howells726c3342006-06-23 02:02:58 -070072static int isofs_statfs (struct dentry *, struct kstatfs *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070073
Christoph Lametere18b8902006-12-06 20:33:20 -080074static struct kmem_cache *isofs_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -070075
76static struct inode *isofs_alloc_inode(struct super_block *sb)
77{
78 struct iso_inode_info *ei;
Christoph Lametere94b1762006-12-06 20:33:17 -080079 ei = kmem_cache_alloc(isofs_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -070080 if (!ei)
81 return NULL;
82 return &ei->vfs_inode;
83}
84
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +110085static void isofs_i_callback(struct rcu_head *head)
86{
87 struct inode *inode = container_of(head, struct inode, i_rcu);
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +110088 kmem_cache_free(isofs_inode_cachep, ISOFS_I(inode));
89}
90
Linus Torvalds1da177e2005-04-16 15:20:36 -070091static void isofs_destroy_inode(struct inode *inode)
92{
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +110093 call_rcu(&inode->i_rcu, isofs_i_callback);
Linus Torvalds1da177e2005-04-16 15:20:36 -070094}
95
Alexey Dobriyan51cc5062008-07-25 19:45:34 -070096static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -070097{
Andrew Morton9eb7f2c2005-06-21 17:16:49 -070098 struct iso_inode_info *ei = foo;
Linus Torvalds1da177e2005-04-16 15:20:36 -070099
Christoph Lametera35afb82007-05-16 22:10:57 -0700100 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101}
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700102
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103static int init_inodecache(void)
104{
105 isofs_inode_cachep = kmem_cache_create("isofs_inode_cache",
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700106 sizeof(struct iso_inode_info),
107 0, (SLAB_RECLAIM_ACCOUNT|
108 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +0900109 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 if (isofs_inode_cachep == NULL)
111 return -ENOMEM;
112 return 0;
113}
114
115static void destroy_inodecache(void)
116{
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -0700117 kmem_cache_destroy(isofs_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118}
119
120static int isofs_remount(struct super_block *sb, int *flags, char *data)
121{
122 /* we probably want a lot more here */
123 *flags |= MS_RDONLY;
124 return 0;
125}
126
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800127static const struct super_operations isofs_sops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 .alloc_inode = isofs_alloc_inode,
129 .destroy_inode = isofs_destroy_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130 .put_super = isofs_put_super,
131 .statfs = isofs_statfs,
132 .remount_fs = isofs_remount,
Miklos Szeredid0132ee2008-02-08 04:21:46 -0800133 .show_options = generic_show_options,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134};
135
136
Al Viroe16404e2009-02-20 05:55:13 +0000137static const struct dentry_operations isofs_dentry_ops[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138 {
139 .d_hash = isofs_hash,
140 .d_compare = isofs_dentry_cmp,
141 },
142 {
143 .d_hash = isofs_hashi,
144 .d_compare = isofs_dentry_cmpi,
145 },
146#ifdef CONFIG_JOLIET
147 {
148 .d_hash = isofs_hash_ms,
149 .d_compare = isofs_dentry_cmp_ms,
150 },
151 {
152 .d_hash = isofs_hashi_ms,
153 .d_compare = isofs_dentry_cmpi_ms,
Andrew Morton9eb7f2c2005-06-21 17:16:49 -0700154 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155#endif
156};
157
158struct iso9660_options{
Jan Kara5404ac82009-06-17 16:26:27 -0700159 unsigned int rock:1;
Bartlomiej Zolnierkiewicz8711c672009-07-10 12:34:27 +0200160 unsigned int joliet:1;
Jan Kara5404ac82009-06-17 16:26:27 -0700161 unsigned int cruft:1;
162 unsigned int hide:1;
163 unsigned int showassoc:1;
164 unsigned int nocompress:1;
165 unsigned int overriderockperm:1;
166 unsigned int uid_set:1;
167 unsigned int gid_set:1;
168 unsigned int utf8:1;
169 unsigned char map;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 unsigned char check;
171 unsigned int blocksize;
Al Viro7328bdd2011-07-26 03:19:52 -0400172 umode_t fmode;
173 umode_t dmode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 gid_t gid;
175 uid_t uid;
176 char *iocharset;
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700177 /* LVE */
178 s32 session;
179 s32 sbsector;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180};
181
182/*
183 * Compute the hash for the isofs name corresponding to the dentry.
184 */
185static int
Nick Pigginb1e6a012011-01-07 17:49:28 +1100186isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187{
188 const char *name;
189 int len;
190
191 len = qstr->len;
192 name = qstr->name;
193 if (ms) {
194 while (len && name[len-1] == '.')
195 len--;
196 }
197
198 qstr->hash = full_name_hash(name, len);
199
200 return 0;
201}
202
203/*
204 * Compute the hash for the isofs name corresponding to the dentry.
205 */
206static int
Nick Pigginb1e6a012011-01-07 17:49:28 +1100207isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208{
209 const char *name;
210 int len;
211 char c;
212 unsigned long hash;
213
214 len = qstr->len;
215 name = qstr->name;
216 if (ms) {
217 while (len && name[len-1] == '.')
218 len--;
219 }
220
221 hash = init_name_hash();
222 while (len--) {
223 c = tolower(*name++);
young davef17e1212007-07-15 23:40:17 -0700224 hash = partial_name_hash(c, hash);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 }
226 qstr->hash = end_name_hash(hash);
227
228 return 0;
229}
230
231/*
Nick Piggin621e1552011-01-07 17:49:27 +1100232 * Compare of two isofs names.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 */
Nick Piggin621e1552011-01-07 17:49:27 +1100234static int isofs_dentry_cmp_common(
235 unsigned int len, const char *str,
236 const struct qstr *name, int ms, int ci)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237{
238 int alen, blen;
239
240 /* A filename cannot end in '.' or we treat it like it has none */
Nick Piggin621e1552011-01-07 17:49:27 +1100241 alen = name->len;
242 blen = len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 if (ms) {
Nick Piggin621e1552011-01-07 17:49:27 +1100244 while (alen && name->name[alen-1] == '.')
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 alen--;
Nick Piggin621e1552011-01-07 17:49:27 +1100246 while (blen && str[blen-1] == '.')
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 blen--;
248 }
249 if (alen == blen) {
Nick Piggin621e1552011-01-07 17:49:27 +1100250 if (ci) {
251 if (strnicmp(name->name, str, alen) == 0)
252 return 0;
253 } else {
254 if (strncmp(name->name, str, alen) == 0)
255 return 0;
256 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 }
258 return 1;
259}
260
261static int
Nick Pigginb1e6a012011-01-07 17:49:28 +1100262isofs_hash(const struct dentry *dentry, const struct inode *inode,
263 struct qstr *qstr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264{
265 return isofs_hash_common(dentry, qstr, 0);
266}
267
268static int
Nick Pigginb1e6a012011-01-07 17:49:28 +1100269isofs_hashi(const struct dentry *dentry, const struct inode *inode,
270 struct qstr *qstr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271{
272 return isofs_hashi_common(dentry, qstr, 0);
273}
274
275static int
Nick Piggin621e1552011-01-07 17:49:27 +1100276isofs_dentry_cmp(const struct dentry *parent, const struct inode *pinode,
277 const struct dentry *dentry, const struct inode *inode,
278 unsigned int len, const char *str, const struct qstr *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279{
Nick Piggin621e1552011-01-07 17:49:27 +1100280 return isofs_dentry_cmp_common(len, str, name, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281}
282
283static int
Nick Piggin621e1552011-01-07 17:49:27 +1100284isofs_dentry_cmpi(const struct dentry *parent, const struct inode *pinode,
285 const struct dentry *dentry, const struct inode *inode,
286 unsigned int len, const char *str, const struct qstr *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287{
Nick Piggin621e1552011-01-07 17:49:27 +1100288 return isofs_dentry_cmp_common(len, str, name, 0, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289}
290
291#ifdef CONFIG_JOLIET
292static int
Nick Pigginb1e6a012011-01-07 17:49:28 +1100293isofs_hash_ms(const struct dentry *dentry, const struct inode *inode,
294 struct qstr *qstr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295{
296 return isofs_hash_common(dentry, qstr, 1);
297}
298
299static int
Nick Pigginb1e6a012011-01-07 17:49:28 +1100300isofs_hashi_ms(const struct dentry *dentry, const struct inode *inode,
301 struct qstr *qstr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302{
303 return isofs_hashi_common(dentry, qstr, 1);
304}
305
306static int
Nick Piggin621e1552011-01-07 17:49:27 +1100307isofs_dentry_cmp_ms(const struct dentry *parent, const struct inode *pinode,
308 const struct dentry *dentry, const struct inode *inode,
309 unsigned int len, const char *str, const struct qstr *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310{
Nick Piggin621e1552011-01-07 17:49:27 +1100311 return isofs_dentry_cmp_common(len, str, name, 1, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312}
313
314static int
Nick Piggin621e1552011-01-07 17:49:27 +1100315isofs_dentry_cmpi_ms(const struct dentry *parent, const struct inode *pinode,
316 const struct dentry *dentry, const struct inode *inode,
317 unsigned int len, const char *str, const struct qstr *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318{
Nick Piggin621e1552011-01-07 17:49:27 +1100319 return isofs_dentry_cmp_common(len, str, name, 1, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320}
321#endif
322
323enum {
324 Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
325 Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
326 Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
Jan Kara52b680c2009-06-17 16:26:25 -0700327 Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328};
329
Steven Whitehousea447c092008-10-13 10:46:57 +0100330static const match_table_t tokens = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331 {Opt_norock, "norock"},
332 {Opt_nojoliet, "nojoliet"},
333 {Opt_unhide, "unhide"},
Jeremy White9769f4e2005-06-21 17:16:53 -0700334 {Opt_hide, "hide"},
335 {Opt_showassoc, "showassoc"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 {Opt_cruft, "cruft"},
337 {Opt_utf8, "utf8"},
338 {Opt_iocharset, "iocharset=%s"},
339 {Opt_map_a, "map=acorn"},
340 {Opt_map_a, "map=a"},
341 {Opt_map_n, "map=normal"},
342 {Opt_map_n, "map=n"},
343 {Opt_map_o, "map=off"},
344 {Opt_map_o, "map=o"},
345 {Opt_session, "session=%u"},
346 {Opt_sb, "sbsector=%u"},
347 {Opt_check_r, "check=relaxed"},
348 {Opt_check_r, "check=r"},
349 {Opt_check_s, "check=strict"},
350 {Opt_check_s, "check=s"},
351 {Opt_uid, "uid=%u"},
352 {Opt_gid, "gid=%u"},
353 {Opt_mode, "mode=%u"},
Jan Kara9b7880e2008-02-08 04:21:09 -0800354 {Opt_dmode, "dmode=%u"},
Jan Kara52b680c2009-06-17 16:26:25 -0700355 {Opt_overriderockperm, "overriderockperm"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356 {Opt_block, "block=%u"},
357 {Opt_ignore, "conv=binary"},
358 {Opt_ignore, "conv=b"},
359 {Opt_ignore, "conv=text"},
360 {Opt_ignore, "conv=t"},
361 {Opt_ignore, "conv=mtext"},
362 {Opt_ignore, "conv=m"},
363 {Opt_ignore, "conv=auto"},
364 {Opt_ignore, "conv=a"},
365 {Opt_nocompress, "nocompress"},
366 {Opt_err, NULL}
367};
368
Andrew Morton9eb7f2c2005-06-21 17:16:49 -0700369static int parse_options(char *options, struct iso9660_options *popt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370{
371 char *p;
372 int option;
373
374 popt->map = 'n';
Jan Kara5404ac82009-06-17 16:26:27 -0700375 popt->rock = 1;
376 popt->joliet = 1;
377 popt->cruft = 0;
378 popt->hide = 0;
379 popt->showassoc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380 popt->check = 'u'; /* unset */
381 popt->nocompress = 0;
382 popt->blocksize = 1024;
Jan Kara52b680c2009-06-17 16:26:25 -0700383 popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
Jan Kara5c4a6562009-06-17 16:26:27 -0700384 popt->uid_set = 0;
385 popt->gid_set = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700386 popt->gid = 0;
387 popt->uid = 0;
388 popt->iocharset = NULL;
389 popt->utf8 = 0;
Jan Kara52b680c2009-06-17 16:26:25 -0700390 popt->overriderockperm = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700391 popt->session=-1;
392 popt->sbsector=-1;
393 if (!options)
394 return 1;
395
396 while ((p = strsep(&options, ",")) != NULL) {
397 int token;
398 substring_t args[MAX_OPT_ARGS];
399 unsigned n;
400
401 if (!*p)
402 continue;
403
404 token = match_token(p, tokens, args);
405 switch (token) {
406 case Opt_norock:
Jan Kara5404ac82009-06-17 16:26:27 -0700407 popt->rock = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 break;
409 case Opt_nojoliet:
Jan Kara5404ac82009-06-17 16:26:27 -0700410 popt->joliet = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 break;
Jeremy White9769f4e2005-06-21 17:16:53 -0700412 case Opt_hide:
Jan Kara5404ac82009-06-17 16:26:27 -0700413 popt->hide = 1;
Jeremy White9769f4e2005-06-21 17:16:53 -0700414 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 case Opt_unhide:
Jeremy White9769f4e2005-06-21 17:16:53 -0700416 case Opt_showassoc:
Jan Kara5404ac82009-06-17 16:26:27 -0700417 popt->showassoc = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418 break;
419 case Opt_cruft:
Jan Kara5404ac82009-06-17 16:26:27 -0700420 popt->cruft = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421 break;
422 case Opt_utf8:
423 popt->utf8 = 1;
424 break;
425#ifdef CONFIG_JOLIET
426 case Opt_iocharset:
427 popt->iocharset = match_strdup(&args[0]);
428 break;
429#endif
430 case Opt_map_a:
431 popt->map = 'a';
432 break;
433 case Opt_map_o:
434 popt->map = 'o';
435 break;
436 case Opt_map_n:
437 popt->map = 'n';
438 break;
439 case Opt_session:
440 if (match_int(&args[0], &option))
441 return 0;
442 n = option;
443 if (n > 99)
444 return 0;
445 popt->session = n + 1;
446 break;
447 case Opt_sb:
448 if (match_int(&args[0], &option))
449 return 0;
450 popt->sbsector = option;
451 break;
452 case Opt_check_r:
453 popt->check = 'r';
454 break;
455 case Opt_check_s:
456 popt->check = 's';
457 break;
458 case Opt_ignore:
459 break;
460 case Opt_uid:
461 if (match_int(&args[0], &option))
462 return 0;
463 popt->uid = option;
Jan Kara5c4a6562009-06-17 16:26:27 -0700464 popt->uid_set = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 break;
466 case Opt_gid:
467 if (match_int(&args[0], &option))
468 return 0;
469 popt->gid = option;
Jan Kara5c4a6562009-06-17 16:26:27 -0700470 popt->gid_set = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700471 break;
472 case Opt_mode:
473 if (match_int(&args[0], &option))
474 return 0;
Jan Kara9b7880e2008-02-08 04:21:09 -0800475 popt->fmode = option;
476 break;
477 case Opt_dmode:
478 if (match_int(&args[0], &option))
479 return 0;
480 popt->dmode = option;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 break;
Jan Kara52b680c2009-06-17 16:26:25 -0700482 case Opt_overriderockperm:
483 popt->overriderockperm = 1;
484 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 case Opt_block:
486 if (match_int(&args[0], &option))
487 return 0;
488 n = option;
489 if (n != 512 && n != 1024 && n != 2048)
490 return 0;
491 popt->blocksize = n;
492 break;
493 case Opt_nocompress:
494 popt->nocompress = 1;
495 break;
496 default:
497 return 0;
498 }
499 }
500 return 1;
501}
502
503/*
504 * look if the driver can tell the multi session redirection value
505 *
506 * don't change this if you don't know what you do, please!
507 * Multisession is legal only with XA disks.
508 * A non-XA disk with more than one volume descriptor may do it right, but
509 * usually is written in a nowhere standardized "multi-partition" manner.
510 * Multisession uses absolute addressing (solely the first frame of the whole
511 * track is #0), multi-partition uses relative addressing (each first frame of
512 * each track is #0), and a track is not a session.
513 *
514 * A broken CDwriter software or drive firmware does not set new standards,
515 * at least not if conflicting with the existing ones.
516 *
517 * emoenke@gwdg.de
518 */
519#define WE_OBEY_THE_WRITTEN_STANDARDS 1
520
Andrew Morton9eb7f2c2005-06-21 17:16:49 -0700521static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522{
523 struct cdrom_multisession ms_info;
524 unsigned int vol_desc_start;
525 struct block_device *bdev = sb->s_bdev;
526 int i;
527
528 vol_desc_start=0;
529 ms_info.addr_format=CDROM_LBA;
530 if(session >= 0 && session <= 99) {
531 struct cdrom_tocentry Te;
532 Te.cdte_track=session;
533 Te.cdte_format=CDROM_LBA;
534 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
535 if (!i) {
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700536 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
537 session, Te.cdte_addr.lba,
538 Te.cdte_ctrl&CDROM_DATA_TRACK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
540 return Te.cdte_addr.lba;
541 }
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700542
543 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544 }
545 i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
Andrew Morton9eb7f2c2005-06-21 17:16:49 -0700546 if (session > 0)
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700547 printk(KERN_ERR "ISOFS: Invalid session number\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548#if 0
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700549 printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700550 if (i==0) {
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700551 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
552 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 }
554#endif
555 if (i==0)
556#if WE_OBEY_THE_WRITTEN_STANDARDS
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700557 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558#endif
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700559 vol_desc_start=ms_info.addr.lba;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 return vol_desc_start;
561}
562
563/*
Ondrej Zarye45c9ef2010-10-27 15:33:30 -0700564 * Check if root directory is empty (has less than 3 files).
565 *
566 * Used to detect broken CDs where ISO root directory is empty but Joliet root
567 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
568 * (and Joliet used instead) or else no files would be visible.
569 */
570static bool rootdir_empty(struct super_block *sb, unsigned long block)
571{
572 int offset = 0, files = 0, de_len;
573 struct iso_directory_record *de;
574 struct buffer_head *bh;
575
576 bh = sb_bread(sb, block);
577 if (!bh)
578 return true;
579 while (files < 3) {
580 de = (struct iso_directory_record *) (bh->b_data + offset);
581 de_len = *(unsigned char *) de;
582 if (de_len == 0)
583 break;
584 files++;
585 offset += de_len;
586 }
587 brelse(bh);
588 return files < 3;
589}
590
591/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592 * Initialize the superblock and read the root inode.
593 *
594 * Note: a check_disk_change() has been done immediately prior
595 * to this call, so we don't need to check again.
596 */
597static int isofs_fill_super(struct super_block *s, void *data, int silent)
598{
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700599 struct buffer_head *bh = NULL, *pri_bh = NULL;
600 struct hs_primary_descriptor *h_pri = NULL;
601 struct iso_primary_descriptor *pri = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700602 struct iso_supplementary_descriptor *sec = NULL;
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700603 struct iso_directory_record *rootp;
604 struct inode *inode;
605 struct iso9660_options opt;
606 struct isofs_sb_info *sbi;
607 unsigned long first_data_zone;
608 int joliet_level = 0;
609 int iso_blknum, block;
610 int orig_zonesize;
David Howellsc4386c82008-02-07 00:15:41 -0800611 int table, error = -EINVAL;
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700612 unsigned int vol_desc_start;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613
Miklos Szeredid0132ee2008-02-08 04:21:46 -0800614 save_mount_options(s, data);
615
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700616 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
Arnd Bergmann4f819a72010-09-12 19:05:56 +0200617 if (!sbi)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 return -ENOMEM;
619 s->s_fs_info = sbi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700620
Andrew Morton9eb7f2c2005-06-21 17:16:49 -0700621 if (!parse_options((char *)data, &opt))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622 goto out_freesbi;
623
624 /*
625 * First of all, get the hardware blocksize for this device.
626 * If we don't know what it is, or the hardware blocksize is
627 * larger than the blocksize the user specified, then use
628 * that value.
629 */
630 /*
631 * What if bugger tells us to go beyond page size?
632 */
633 opt.blocksize = sb_min_blocksize(s, opt.blocksize);
634
635 sbi->s_high_sierra = 0; /* default is iso9660 */
636
637 vol_desc_start = (opt.sbsector != -1) ?
638 opt.sbsector : isofs_get_last_session(s,opt.session);
639
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700640 for (iso_blknum = vol_desc_start+16;
641 iso_blknum < vol_desc_start+100; iso_blknum++) {
642 struct hs_volume_descriptor *hdp;
643 struct iso_volume_descriptor *vdp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700645 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
646 if (!(bh = sb_bread(s, block)))
647 goto out_no_read;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700649 vdp = (struct iso_volume_descriptor *)bh->b_data;
650 hdp = (struct hs_volume_descriptor *)bh->b_data;
651
652 /*
653 * Due to the overlapping physical location of the descriptors,
654 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
655 * proper identification in this case, we first check for ISO.
656 */
657 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
658 if (isonum_711(vdp->type) == ISO_VD_END)
659 break;
660 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
661 if (pri == NULL) {
662 pri = (struct iso_primary_descriptor *)vdp;
663 /* Save the buffer in case we need it ... */
664 pri_bh = bh;
665 bh = NULL;
666 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667 }
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700668#ifdef CONFIG_JOLIET
669 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
670 sec = (struct iso_supplementary_descriptor *)vdp;
671 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
Bartlomiej Zolnierkiewicz8711c672009-07-10 12:34:27 +0200672 if (opt.joliet) {
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700673 if (sec->escape[2] == 0x40)
674 joliet_level = 1;
675 else if (sec->escape[2] == 0x43)
676 joliet_level = 2;
677 else if (sec->escape[2] == 0x45)
678 joliet_level = 3;
679
680 printk(KERN_DEBUG "ISO 9660 Extensions: "
681 "Microsoft Joliet Level %d\n",
682 joliet_level);
683 }
684 goto root_found;
685 } else {
686 /* Unknown supplementary volume descriptor */
687 sec = NULL;
688 }
689 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690#endif
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700691 } else {
692 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
693 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
694 goto out_freebh;
695
696 sbi->s_high_sierra = 1;
Jan Kara5404ac82009-06-17 16:26:27 -0700697 opt.rock = 0;
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700698 h_pri = (struct hs_primary_descriptor *)vdp;
699 goto root_found;
700 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700701 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700703 /* Just skip any volume descriptors we don't recognize */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700705 brelse(bh);
706 bh = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700707 }
708 /*
709 * If we fall through, either no volume descriptor was found,
710 * or else we passed a primary descriptor looking for others.
711 */
712 if (!pri)
713 goto out_unknown_format;
714 brelse(bh);
715 bh = pri_bh;
716 pri_bh = NULL;
717
718root_found:
719
Jan Kara5404ac82009-06-17 16:26:27 -0700720 if (joliet_level && (pri == NULL || !opt.rock)) {
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700721 /* This is the case of Joliet with the norock mount flag.
722 * A disc with both Joliet and Rock Ridge is handled later
723 */
724 pri = (struct iso_primary_descriptor *) sec;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700725 }
726
727 if(sbi->s_high_sierra){
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700728 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
729 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
730 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
731 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732 } else {
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700733 if (!pri)
734 goto out_freebh;
735 rootp = (struct iso_directory_record *) pri->root_directory_record;
736 sbi->s_nzones = isonum_733(pri->volume_space_size);
737 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
738 sbi->s_max_size = isonum_733(pri->volume_space_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700739 }
740
741 sbi->s_ninodes = 0; /* No way to figure this out easily */
742
743 orig_zonesize = sbi->s_log_zone_size;
744 /*
745 * If the zone size is smaller than the hardware sector size,
746 * this is a fatal error. This would occur if the disc drive
747 * had sectors that were 2048 bytes, but the filesystem had
748 * blocks that were 512 bytes (which should only very rarely
749 * happen.)
750 */
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700751 if (orig_zonesize < opt.blocksize)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752 goto out_bad_size;
753
754 /* RDE: convert log zone size to bit shift */
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700755 switch (sbi->s_log_zone_size) {
756 case 512: sbi->s_log_zone_size = 9; break;
757 case 1024: sbi->s_log_zone_size = 10; break;
758 case 2048: sbi->s_log_zone_size = 11; break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700759
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700760 default:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761 goto out_bad_zone_size;
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700762 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700763
764 s->s_magic = ISOFS_SUPER_MAGIC;
Jan Andres66a362a2010-08-04 22:52:46 +0200765
766 /*
767 * With multi-extent files, file size is only limited by the maximum
768 * size of a file system, which is 8 TB.
769 */
770 s->s_maxbytes = 0x80000000000LL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700772 /*
773 * The CDROM is read-only, has no nodes (devices) on it, and since
774 * all of the files appear to be owned by root, we really do not want
775 * to allow suid. (suid or devices will not show up unless we have
776 * Rock Ridge extensions)
777 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778
779 s->s_flags |= MS_RDONLY /* | MS_NODEV | MS_NOSUID */;
780
781 /* Set this for reference. Its not currently used except on write
782 which we don't have .. */
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700783
784 first_data_zone = isonum_733(rootp->extent) +
785 isonum_711(rootp->ext_attr_length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 sbi->s_firstdatazone = first_data_zone;
787#ifndef BEQUIET
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700788 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n",
789 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
790 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791 if(sbi->s_high_sierra)
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700792 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793#endif
794
795 /*
796 * If the Joliet level is set, we _may_ decide to use the
797 * secondary descriptor, but can't be sure until after we
798 * read the root inode. But before reading the root inode
799 * we may need to change the device blocksize, and would
800 * rather release the old buffer first. So, we cache the
801 * first_data_zone value from the secondary descriptor.
802 */
803 if (joliet_level) {
804 pri = (struct iso_primary_descriptor *) sec;
805 rootp = (struct iso_directory_record *)
806 pri->root_directory_record;
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700807 first_data_zone = isonum_733(rootp->extent) +
808 isonum_711(rootp->ext_attr_length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809 }
810
811 /*
812 * We're all done using the volume descriptor, and may need
813 * to change the device blocksize, so release the buffer now.
814 */
815 brelse(pri_bh);
816 brelse(bh);
817
818 /*
819 * Force the blocksize to 512 for 512 byte sectors. The file
820 * read primitives really get it wrong in a bad way if we don't
821 * do this.
822 *
823 * Note - we should never be setting the blocksize to something
824 * less than the hardware sector size for the device. If we
825 * do, we would end up having to read larger buffers and split
826 * out portions to satisfy requests.
827 *
828 * Note2- the idea here is that we want to deal with the optimal
829 * zonesize in the filesystem. If we have it set to something less,
830 * then we have horrible problems with trying to piece together
831 * bits of adjacent blocks in order to properly read directory
832 * entries. By forcing the blocksize in this way, we ensure
833 * that we will never be required to do this.
834 */
835 sb_set_blocksize(s, orig_zonesize);
836
837 sbi->s_nls_iocharset = NULL;
838
839#ifdef CONFIG_JOLIET
840 if (joliet_level && opt.utf8 == 0) {
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700841 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700842 sbi->s_nls_iocharset = load_nls(p);
843 if (! sbi->s_nls_iocharset) {
844 /* Fail only if explicit charset specified */
845 if (opt.iocharset)
846 goto out_freesbi;
847 sbi->s_nls_iocharset = load_nls_default();
848 }
849 }
850#endif
851 s->s_op = &isofs_sops;
852 s->s_export_op = &isofs_export_ops;
853 sbi->s_mapping = opt.map;
Jan Kara5404ac82009-06-17 16:26:27 -0700854 sbi->s_rock = (opt.rock ? 2 : 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
856 sbi->s_cruft = opt.cruft;
Jeremy White9769f4e2005-06-21 17:16:53 -0700857 sbi->s_hide = opt.hide;
858 sbi->s_showassoc = opt.showassoc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700859 sbi->s_uid = opt.uid;
860 sbi->s_gid = opt.gid;
Jan Kara5c4a6562009-06-17 16:26:27 -0700861 sbi->s_uid_set = opt.uid_set;
862 sbi->s_gid_set = opt.gid_set;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863 sbi->s_utf8 = opt.utf8;
864 sbi->s_nocompress = opt.nocompress;
Jan Kara52b680c2009-06-17 16:26:25 -0700865 sbi->s_overriderockperm = opt.overriderockperm;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700866 /*
867 * It would be incredibly stupid to allow people to mark every file
868 * on the disk as suid, so we merely allow them to set the default
869 * permissions.
870 */
Jan Kara52b680c2009-06-17 16:26:25 -0700871 if (opt.fmode != ISOFS_INVALID_MODE)
872 sbi->s_fmode = opt.fmode & 0777;
873 else
874 sbi->s_fmode = ISOFS_INVALID_MODE;
875 if (opt.dmode != ISOFS_INVALID_MODE)
876 sbi->s_dmode = opt.dmode & 0777;
877 else
878 sbi->s_dmode = ISOFS_INVALID_MODE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700879
880 /*
881 * Read the root inode, which _may_ result in changing
882 * the s_rock flag. Once we have the final s_rock value,
883 * we then decide whether to use the Joliet descriptor.
884 */
885 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
David Howellsc4386c82008-02-07 00:15:41 -0800886 if (IS_ERR(inode))
887 goto out_no_root;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700888
889 /*
Ondrej Zarye45c9ef2010-10-27 15:33:30 -0700890 * Fix for broken CDs with Rock Ridge and empty ISO root directory but
891 * correct Joliet root directory.
892 */
893 if (sbi->s_rock == 1 && joliet_level &&
894 rootdir_empty(s, sbi->s_firstdatazone)) {
895 printk(KERN_NOTICE
896 "ISOFS: primary root directory is empty. "
897 "Disabling Rock Ridge and switching to Joliet.");
898 sbi->s_rock = 0;
899 }
900
901 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700902 * If this disk has both Rock Ridge and Joliet on it, then we
903 * want to use Rock Ridge by default. This can be overridden
904 * by using the norock mount option. There is still one other
905 * possibility that is not taken into account: a Rock Ridge
906 * CD with Unicode names. Until someone sees such a beast, it
907 * will not be supported.
908 */
909 if (sbi->s_rock == 1) {
910 joliet_level = 0;
911 } else if (joliet_level) {
912 sbi->s_rock = 0;
913 if (sbi->s_firstdatazone != first_data_zone) {
914 sbi->s_firstdatazone = first_data_zone;
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700915 printk(KERN_DEBUG
Linus Torvalds1da177e2005-04-16 15:20:36 -0700916 "ISOFS: changing to secondary root\n");
917 iput(inode);
918 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
David Howellsc4386c82008-02-07 00:15:41 -0800919 if (IS_ERR(inode))
920 goto out_no_root;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700921 }
922 }
923
924 if (opt.check == 'u') {
925 /* Only Joliet is case insensitive by default */
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700926 if (joliet_level)
927 opt.check = 'r';
928 else
929 opt.check = 's';
Linus Torvalds1da177e2005-04-16 15:20:36 -0700930 }
931 sbi->s_joliet_level = joliet_level;
932
Kirill Kuvaldin817794e2007-07-31 00:38:58 -0700933 /* Make sure the root inode is a directory */
934 if (!S_ISDIR(inode->i_mode)) {
935 printk(KERN_WARNING
936 "isofs_fill_super: root inode is not a directory. "
937 "Corrupted media?\n");
938 goto out_iput;
939 }
940
Linus Torvalds1da177e2005-04-16 15:20:36 -0700941 table = 0;
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700942 if (joliet_level)
943 table += 2;
944 if (opt.check == 'r')
945 table++;
Al Viro6cc9c1d2010-12-18 10:29:26 -0500946
947 s->s_d_op = &isofs_dentry_ops[table];
948
949 /* get the root dentry */
950 s->s_root = d_alloc_root(inode);
Al Viro8fdd8c42012-01-09 10:48:11 -0500951 if (!(s->s_root)) {
952 iput(inode);
953 error = -ENOMEM;
954 goto out_no_inode;
955 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800957 kfree(opt.iocharset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700958
959 return 0;
960
961 /*
962 * Display error messages and free resources.
963 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700964out_iput:
965 iput(inode);
David Howellsc4386c82008-02-07 00:15:41 -0800966 goto out_no_inode;
967out_no_root:
968 error = PTR_ERR(inode);
969 if (error != -ENOMEM)
970 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
971out_no_inode:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972#ifdef CONFIG_JOLIET
Thomas Gleixner6d729e42009-08-16 21:05:08 +0000973 unload_nls(sbi->s_nls_iocharset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700974#endif
975 goto out_freesbi;
976out_no_read:
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700977 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
978 __func__, s->s_id, iso_blknum, block);
Linus Torvaldsc11760c2011-06-08 10:30:03 -0700979 goto out_freebh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980out_bad_zone_size:
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700981 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700982 sbi->s_log_zone_size);
983 goto out_freebh;
984out_bad_size:
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700985 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700986 orig_zonesize, opt.blocksize);
987 goto out_freebh;
988out_unknown_format:
989 if (!silent)
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700990 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700991
992out_freebh:
993 brelse(bh);
Linus Torvaldsc11760c2011-06-08 10:30:03 -0700994 brelse(pri_bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995out_freesbi:
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800996 kfree(opt.iocharset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700997 kfree(sbi);
998 s->s_fs_info = NULL;
David Howellsc4386c82008-02-07 00:15:41 -0800999 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001000}
1001
David Howells726c3342006-06-23 02:02:58 -07001002static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001003{
David Howells726c3342006-06-23 02:02:58 -07001004 struct super_block *sb = dentry->d_sb;
Coly Li2430c4d2009-04-02 16:59:38 -07001005 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
David Howells726c3342006-06-23 02:02:58 -07001006
Linus Torvalds1da177e2005-04-16 15:20:36 -07001007 buf->f_type = ISOFS_SUPER_MAGIC;
1008 buf->f_bsize = sb->s_blocksize;
1009 buf->f_blocks = (ISOFS_SB(sb)->s_nzones
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001010 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001011 buf->f_bfree = 0;
1012 buf->f_bavail = 0;
1013 buf->f_files = ISOFS_SB(sb)->s_ninodes;
1014 buf->f_ffree = 0;
Coly Li2430c4d2009-04-02 16:59:38 -07001015 buf->f_fsid.val[0] = (u32)id;
1016 buf->f_fsid.val[1] = (u32)(id >> 32);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001017 buf->f_namelen = NAME_MAX;
1018 return 0;
1019}
1020
1021/*
1022 * Get a set of blocks; filling in buffer_heads if already allocated
1023 * or getblk() if they are not. Returns the number of blocks inserted
David Howellsc4386c82008-02-07 00:15:41 -08001024 * (-ve == error.)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025 */
Jan Karafde214d2010-10-04 11:37:37 +02001026int isofs_get_blocks(struct inode *inode, sector_t iblock,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001027 struct buffer_head **bh, unsigned long nblocks)
1028{
Jan Karafde214d2010-10-04 11:37:37 +02001029 unsigned long b_off = iblock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001030 unsigned offset, sect_size;
1031 unsigned int firstext;
1032 unsigned long nextblk, nextoff;
David Howellsc4386c82008-02-07 00:15:41 -08001033 int section, rv, error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001034 struct iso_inode_info *ei = ISOFS_I(inode);
1035
David Howellsc4386c82008-02-07 00:15:41 -08001036 error = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001037 rv = 0;
Jan Karafde214d2010-10-04 11:37:37 +02001038 if (iblock != b_off) {
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001039 printk(KERN_DEBUG "%s: block number too large\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001040 goto abort;
1041 }
1042
Linus Torvalds1da177e2005-04-16 15:20:36 -07001043
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001044 offset = 0;
1045 firstext = ei->i_first_extent;
1046 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
1047 nextblk = ei->i_next_section_block;
1048 nextoff = ei->i_next_section_offset;
1049 section = 0;
1050
1051 while (nblocks) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001052 /* If we are *way* beyond the end of the file, print a message.
1053 * Access beyond the end of the file up to the next page boundary
1054 * is normal, however because of the way the page cache works.
1055 * In this case, we just return 0 so that we can properly fill
1056 * the page with useless information without generating any
1057 * I/O errors.
1058 */
1059 if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
Jan Karafde214d2010-10-04 11:37:37 +02001060 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
1061 __func__, b_off,
1062 (unsigned long long)inode->i_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001063 goto abort;
1064 }
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001065
Joel & Rebecca VanderZeefb50ae72006-09-29 02:00:30 -07001066 /* On the last section, nextblk == 0, section size is likely to
1067 * exceed sect_size by a partial block, and access beyond the
1068 * end of the file will reach beyond the section size, too.
1069 */
1070 while (nextblk && (b_off >= (offset + sect_size))) {
1071 struct inode *ninode;
1072
1073 offset += sect_size;
1074 ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
David Howellsc4386c82008-02-07 00:15:41 -08001075 if (IS_ERR(ninode)) {
1076 error = PTR_ERR(ninode);
Joel & Rebecca VanderZeefb50ae72006-09-29 02:00:30 -07001077 goto abort;
David Howellsc4386c82008-02-07 00:15:41 -08001078 }
Joel & Rebecca VanderZeefb50ae72006-09-29 02:00:30 -07001079 firstext = ISOFS_I(ninode)->i_first_extent;
1080 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1081 nextblk = ISOFS_I(ninode)->i_next_section_block;
1082 nextoff = ISOFS_I(ninode)->i_next_section_offset;
1083 iput(ninode);
1084
1085 if (++section > 100) {
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001086 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1087 " aborting...\n", __func__);
Jan Karafde214d2010-10-04 11:37:37 +02001088 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001089 "nextblk=%lu nextoff=%lu\n", __func__,
Jan Karafde214d2010-10-04 11:37:37 +02001090 b_off, firstext, (unsigned) sect_size,
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001091 nextblk, nextoff);
Joel & Rebecca VanderZeefb50ae72006-09-29 02:00:30 -07001092 goto abort;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001093 }
1094 }
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001095
1096 if (*bh) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001097 map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1098 } else {
1099 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001100 if (!*bh)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001101 goto abort;
1102 }
1103 bh++; /* Next buffer head */
1104 b_off++; /* Next buffer offset */
1105 nblocks--;
1106 rv++;
1107 }
1108
David Howellsc4386c82008-02-07 00:15:41 -08001109 error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110abort:
David Howellsc4386c82008-02-07 00:15:41 -08001111 return rv != 0 ? rv : error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001112}
1113
1114/*
1115 * Used by the standard interfaces.
1116 */
1117static int isofs_get_block(struct inode *inode, sector_t iblock,
1118 struct buffer_head *bh_result, int create)
1119{
David Howellsc4386c82008-02-07 00:15:41 -08001120 int ret;
1121
Andrew Morton9eb7f2c2005-06-21 17:16:49 -07001122 if (create) {
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001123 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001124 return -EROFS;
1125 }
1126
David Howellsc4386c82008-02-07 00:15:41 -08001127 ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1128 return ret < 0 ? ret : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001129}
1130
1131static int isofs_bmap(struct inode *inode, sector_t block)
1132{
1133 struct buffer_head dummy;
1134 int error;
1135
1136 dummy.b_state = 0;
1137 dummy.b_blocknr = -1000;
1138 error = isofs_get_block(inode, block, &dummy, 0);
1139 if (!error)
1140 return dummy.b_blocknr;
1141 return 0;
1142}
1143
1144struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1145{
1146 sector_t blknr = isofs_bmap(inode, block);
1147 if (!blknr)
1148 return NULL;
1149 return sb_bread(inode->i_sb, blknr);
1150}
1151
1152static int isofs_readpage(struct file *file, struct page *page)
1153{
Namjae Jeon30690832011-11-02 13:38:00 -07001154 return mpage_readpage(page, isofs_get_block);
1155}
1156
1157static int isofs_readpages(struct file *file, struct address_space *mapping,
1158 struct list_head *pages, unsigned nr_pages)
1159{
1160 return mpage_readpages(mapping, pages, nr_pages, isofs_get_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001161}
1162
1163static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1164{
1165 return generic_block_bmap(mapping,block,isofs_get_block);
1166}
1167
Christoph Hellwigf5e54d62006-06-28 04:26:44 -07001168static const struct address_space_operations isofs_aops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169 .readpage = isofs_readpage,
Namjae Jeon30690832011-11-02 13:38:00 -07001170 .readpages = isofs_readpages,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001171 .bmap = _isofs_bmap
1172};
1173
Andrew Morton9eb7f2c2005-06-21 17:16:49 -07001174static int isofs_read_level3_size(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001175{
1176 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1177 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001178 struct buffer_head *bh = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001179 unsigned long block, offset, block_saved, offset_saved;
1180 int i = 0;
1181 int more_entries = 0;
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001182 struct iso_directory_record *tmpde = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001183 struct iso_inode_info *ei = ISOFS_I(inode);
1184
1185 inode->i_size = 0;
1186
1187 /* The first 16 blocks are reserved as the System Area. Thus,
1188 * no inodes can appear in block 0. We use this to flag that
1189 * this is the last section. */
1190 ei->i_next_section_block = 0;
1191 ei->i_next_section_offset = 0;
1192
1193 block = ei->i_iget5_block;
1194 offset = ei->i_iget5_offset;
1195
1196 do {
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001197 struct iso_directory_record *de;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001198 unsigned int de_len;
1199
1200 if (!bh) {
1201 bh = sb_bread(inode->i_sb, block);
1202 if (!bh)
1203 goto out_noread;
1204 }
1205 de = (struct iso_directory_record *) (bh->b_data + offset);
1206 de_len = *(unsigned char *) de;
1207
1208 if (de_len == 0) {
1209 brelse(bh);
1210 bh = NULL;
1211 ++block;
1212 offset = 0;
1213 continue;
1214 }
1215
1216 block_saved = block;
1217 offset_saved = offset;
1218 offset += de_len;
1219
1220 /* Make sure we have a full directory entry */
1221 if (offset >= bufsize) {
1222 int slop = bufsize - offset + de_len;
1223 if (!tmpde) {
1224 tmpde = kmalloc(256, GFP_KERNEL);
1225 if (!tmpde)
1226 goto out_nomem;
1227 }
1228 memcpy(tmpde, de, slop);
1229 offset &= bufsize - 1;
1230 block++;
1231 brelse(bh);
1232 bh = NULL;
1233 if (offset) {
1234 bh = sb_bread(inode->i_sb, block);
1235 if (!bh)
1236 goto out_noread;
Andrew Morton9eb7f2c2005-06-21 17:16:49 -07001237 memcpy((void *)tmpde+slop, bh->b_data, offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001238 }
1239 de = tmpde;
1240 }
1241
1242 inode->i_size += isonum_733(de->size);
1243 if (i == 1) {
1244 ei->i_next_section_block = block_saved;
1245 ei->i_next_section_offset = offset_saved;
1246 }
1247
1248 more_entries = de->flags[-high_sierra] & 0x80;
1249
1250 i++;
Andrew Morton9eb7f2c2005-06-21 17:16:49 -07001251 if (i > 100)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001252 goto out_toomany;
Andrew Morton9eb7f2c2005-06-21 17:16:49 -07001253 } while (more_entries);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001254out:
Andrew Morton9eb7f2c2005-06-21 17:16:49 -07001255 kfree(tmpde);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001256 if (bh)
1257 brelse(bh);
1258 return 0;
1259
1260out_nomem:
1261 if (bh)
1262 brelse(bh);
1263 return -ENOMEM;
1264
1265out_noread:
1266 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
Jesper Juhlf99d49a2005-11-07 01:01:34 -08001267 kfree(tmpde);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001268 return -EIO;
1269
1270out_toomany:
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001271 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1272 "isofs_read_level3_size: inode=%lu\n",
1273 __func__, inode->i_ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001274 goto out;
1275}
1276
David Howellsc4386c82008-02-07 00:15:41 -08001277static int isofs_read_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001278{
1279 struct super_block *sb = inode->i_sb;
1280 struct isofs_sb_info *sbi = ISOFS_SB(sb);
1281 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1282 unsigned long block;
1283 int high_sierra = sbi->s_high_sierra;
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001284 struct buffer_head *bh = NULL;
1285 struct iso_directory_record *de;
1286 struct iso_directory_record *tmpde = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001287 unsigned int de_len;
1288 unsigned long offset;
1289 struct iso_inode_info *ei = ISOFS_I(inode);
David Howellsc4386c82008-02-07 00:15:41 -08001290 int ret = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001291
1292 block = ei->i_iget5_block;
1293 bh = sb_bread(inode->i_sb, block);
1294 if (!bh)
1295 goto out_badread;
1296
1297 offset = ei->i_iget5_offset;
1298
1299 de = (struct iso_directory_record *) (bh->b_data + offset);
1300 de_len = *(unsigned char *) de;
1301
1302 if (offset + de_len > bufsize) {
1303 int frag1 = bufsize - offset;
1304
1305 tmpde = kmalloc(de_len, GFP_KERNEL);
1306 if (tmpde == NULL) {
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001307 printk(KERN_INFO "%s: out of memory\n", __func__);
David Howellsc4386c82008-02-07 00:15:41 -08001308 ret = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001309 goto fail;
1310 }
1311 memcpy(tmpde, bh->b_data + offset, frag1);
1312 brelse(bh);
1313 bh = sb_bread(inode->i_sb, ++block);
1314 if (!bh)
1315 goto out_badread;
1316 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1317 de = tmpde;
1318 }
1319
1320 inode->i_ino = isofs_get_ino(ei->i_iget5_block,
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001321 ei->i_iget5_offset,
1322 ISOFS_BUFFER_BITS(inode));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001323
1324 /* Assume it is a normal-format file unless told otherwise */
1325 ei->i_file_format = isofs_file_normal;
1326
1327 if (de->flags[-high_sierra] & 2) {
Jan Kara52b680c2009-06-17 16:26:25 -07001328 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1329 inode->i_mode = S_IFDIR | sbi->s_dmode;
1330 else
1331 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
Miklos Szeredibfe86842011-10-28 14:13:29 +02001332 set_nlink(inode, 1); /*
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001333 * Set to 1. We know there are 2, but
1334 * the find utility tries to optimize
1335 * if it is 2, and it screws up. It is
1336 * easier to give 1 which tells find to
1337 * do it the hard way.
1338 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001339 } else {
Jan Kara52b680c2009-06-17 16:26:25 -07001340 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1341 inode->i_mode = S_IFREG | sbi->s_fmode;
1342 } else {
1343 /*
1344 * Set default permissions: r-x for all. The disc
1345 * could be shared with DOS machines so virtually
1346 * anything could be a valid executable.
1347 */
1348 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1349 }
Miklos Szeredibfe86842011-10-28 14:13:29 +02001350 set_nlink(inode, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001351 }
1352 inode->i_uid = sbi->s_uid;
1353 inode->i_gid = sbi->s_gid;
Theodore Ts'oba52de12006-09-27 01:50:49 -07001354 inode->i_blocks = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001355
1356 ei->i_format_parm[0] = 0;
1357 ei->i_format_parm[1] = 0;
1358 ei->i_format_parm[2] = 0;
1359
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001360 ei->i_section_size = isonum_733(de->size);
Andrew Morton9eb7f2c2005-06-21 17:16:49 -07001361 if (de->flags[-high_sierra] & 0x80) {
David Howellsc4386c82008-02-07 00:15:41 -08001362 ret = isofs_read_level3_size(inode);
1363 if (ret < 0)
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001364 goto fail;
David Howellsc4386c82008-02-07 00:15:41 -08001365 ret = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001366 } else {
1367 ei->i_next_section_block = 0;
1368 ei->i_next_section_offset = 0;
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001369 inode->i_size = isonum_733(de->size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001370 }
1371
1372 /*
1373 * Some dipshit decided to store some other bit of information
1374 * in the high byte of the file length. Truncate size in case
1375 * this CDROM was mounted with the cruft option.
1376 */
1377
Jan Kara5404ac82009-06-17 16:26:27 -07001378 if (sbi->s_cruft)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001379 inode->i_size &= 0x00ffffff;
1380
1381 if (de->interleave[0]) {
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001382 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001383 inode->i_size = 0;
1384 }
1385
1386 /* I have no idea what file_unit_size is used for, so
1387 we will flag it for now */
1388 if (de->file_unit_size[0] != 0) {
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001389 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1390 inode->i_ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001391 }
1392
1393 /* I have no idea what other flag bits are used for, so
1394 we will flag it for now */
1395#ifdef DEBUG
1396 if((de->flags[-high_sierra] & ~2)!= 0){
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001397 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1398 "(%ld %x).\n",
1399 inode->i_ino, de->flags[-high_sierra]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001400 }
1401#endif
1402
1403 inode->i_mtime.tv_sec =
1404 inode->i_atime.tv_sec =
1405 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1406 inode->i_mtime.tv_nsec =
1407 inode->i_atime.tv_nsec =
1408 inode->i_ctime.tv_nsec = 0;
1409
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001410 ei->i_first_extent = (isonum_733(de->extent) +
1411 isonum_711(de->ext_attr_length));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001412
1413 /* Set the number of blocks for stat() - should be done before RR */
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001414 inode->i_blocks = (inode->i_size + 511) >> 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001415
1416 /*
1417 * Now test for possible Rock Ridge extensions which will override
1418 * some of these numbers in the inode structure.
1419 */
1420
1421 if (!high_sierra) {
1422 parse_rock_ridge_inode(de, inode);
1423 /* if we want uid/gid set, override the rock ridge setting */
Jan Kara5c4a6562009-06-17 16:26:27 -07001424 if (sbi->s_uid_set)
1425 inode->i_uid = sbi->s_uid;
1426 if (sbi->s_gid_set)
1427 inode->i_gid = sbi->s_gid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001428 }
Jan Kara52b680c2009-06-17 16:26:25 -07001429 /* Now set final access rights if overriding rock ridge setting */
1430 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1431 sbi->s_dmode != ISOFS_INVALID_MODE)
1432 inode->i_mode = S_IFDIR | sbi->s_dmode;
1433 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1434 sbi->s_fmode != ISOFS_INVALID_MODE)
1435 inode->i_mode = S_IFREG | sbi->s_fmode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001436
1437 /* Install the inode operations vector */
1438 if (S_ISREG(inode->i_mode)) {
1439 inode->i_fop = &generic_ro_fops;
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001440 switch (ei->i_file_format) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001441#ifdef CONFIG_ZISOFS
1442 case isofs_file_compressed:
1443 inode->i_data.a_ops = &zisofs_aops;
1444 break;
1445#endif
1446 default:
1447 inode->i_data.a_ops = &isofs_aops;
1448 break;
1449 }
1450 } else if (S_ISDIR(inode->i_mode)) {
1451 inode->i_op = &isofs_dir_inode_operations;
1452 inode->i_fop = &isofs_dir_operations;
1453 } else if (S_ISLNK(inode->i_mode)) {
1454 inode->i_op = &page_symlink_inode_operations;
1455 inode->i_data.a_ops = &isofs_symlink_aops;
1456 } else
1457 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1458 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1459
David Howellsc4386c82008-02-07 00:15:41 -08001460 ret = 0;
Andrew Morton9eb7f2c2005-06-21 17:16:49 -07001461out:
Jesper Juhlf99d49a2005-11-07 01:01:34 -08001462 kfree(tmpde);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001463 if (bh)
1464 brelse(bh);
David Howellsc4386c82008-02-07 00:15:41 -08001465 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001466
Andrew Morton9eb7f2c2005-06-21 17:16:49 -07001467out_badread:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001468 printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
Andrew Morton9eb7f2c2005-06-21 17:16:49 -07001469fail:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001470 goto out;
1471}
1472
1473struct isofs_iget5_callback_data {
1474 unsigned long block;
1475 unsigned long offset;
1476};
1477
1478static int isofs_iget5_test(struct inode *ino, void *data)
1479{
1480 struct iso_inode_info *i = ISOFS_I(ino);
1481 struct isofs_iget5_callback_data *d =
1482 (struct isofs_iget5_callback_data*)data;
1483 return (i->i_iget5_block == d->block)
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001484 && (i->i_iget5_offset == d->offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001485}
1486
1487static int isofs_iget5_set(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 i->i_iget5_block = d->block;
1493 i->i_iget5_offset = d->offset;
1494 return 0;
1495}
1496
1497/* Store, in the inode's containing structure, the block and block
1498 * offset that point to the underlying meta-data for the inode. The
1499 * code below is otherwise similar to the iget() code in
1500 * include/linux/fs.h */
1501struct inode *isofs_iget(struct super_block *sb,
1502 unsigned long block,
1503 unsigned long offset)
1504{
1505 unsigned long hashval;
1506 struct inode *inode;
1507 struct isofs_iget5_callback_data data;
David Howellsc4386c82008-02-07 00:15:41 -08001508 long ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001509
1510 if (offset >= 1ul << sb->s_blocksize_bits)
David Howellsc4386c82008-02-07 00:15:41 -08001511 return ERR_PTR(-EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001512
1513 data.block = block;
1514 data.offset = offset;
1515
1516 hashval = (block << sb->s_blocksize_bits) | offset;
1517
Andrew Morton9eb7f2c2005-06-21 17:16:49 -07001518 inode = iget5_locked(sb, hashval, &isofs_iget5_test,
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001519 &isofs_iget5_set, &data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001520
David Howellsc4386c82008-02-07 00:15:41 -08001521 if (!inode)
1522 return ERR_PTR(-ENOMEM);
1523
1524 if (inode->i_state & I_NEW) {
1525 ret = isofs_read_inode(inode);
1526 if (ret < 0) {
1527 iget_failed(inode);
1528 inode = ERR_PTR(ret);
1529 } else {
1530 unlock_new_inode(inode);
1531 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001532 }
1533
1534 return inode;
1535}
1536
Al Viro152a0832010-07-25 00:46:55 +04001537static struct dentry *isofs_mount(struct file_system_type *fs_type,
1538 int flags, const char *dev_name, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001539{
Al Viro152a0832010-07-25 00:46:55 +04001540 return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001541}
1542
1543static struct file_system_type iso9660_fs_type = {
1544 .owner = THIS_MODULE,
1545 .name = "iso9660",
Al Viro152a0832010-07-25 00:46:55 +04001546 .mount = isofs_mount,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001547 .kill_sb = kill_block_super,
1548 .fs_flags = FS_REQUIRES_DEV,
1549};
1550
1551static int __init init_iso9660_fs(void)
1552{
1553 int err = init_inodecache();
1554 if (err)
1555 goto out;
1556#ifdef CONFIG_ZISOFS
1557 err = zisofs_init();
1558 if (err)
1559 goto out1;
1560#endif
1561 err = register_filesystem(&iso9660_fs_type);
1562 if (err)
1563 goto out2;
1564 return 0;
1565out2:
1566#ifdef CONFIG_ZISOFS
1567 zisofs_cleanup();
1568out1:
1569#endif
1570 destroy_inodecache();
1571out:
1572 return err;
1573}
1574
1575static void __exit exit_iso9660_fs(void)
1576{
1577 unregister_filesystem(&iso9660_fs_type);
1578#ifdef CONFIG_ZISOFS
1579 zisofs_cleanup();
1580#endif
1581 destroy_inodecache();
1582}
1583
1584module_init(init_iso9660_fs)
1585module_exit(exit_iso9660_fs)
1586MODULE_LICENSE("GPL");
1587/* Actual filesystem name is iso9660, as requested in filesystems.c */
1588MODULE_ALIAS("iso9660");