blob: f950059525fc64574273f404c666e33bfb7b6666 [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);
88 INIT_LIST_HEAD(&inode->i_dentry);
89 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{
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -0700118 kmem_cache_destroy(isofs_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119}
120
121static int isofs_remount(struct super_block *sb, int *flags, char *data)
122{
123 /* we probably want a lot more here */
124 *flags |= MS_RDONLY;
125 return 0;
126}
127
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800128static const struct super_operations isofs_sops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129 .alloc_inode = isofs_alloc_inode,
130 .destroy_inode = isofs_destroy_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 .put_super = isofs_put_super,
132 .statfs = isofs_statfs,
133 .remount_fs = isofs_remount,
Miklos Szeredid0132ee2008-02-08 04:21:46 -0800134 .show_options = generic_show_options,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135};
136
137
Al Viroe16404e2009-02-20 05:55:13 +0000138static const struct dentry_operations isofs_dentry_ops[] = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 {
140 .d_hash = isofs_hash,
141 .d_compare = isofs_dentry_cmp,
142 },
143 {
144 .d_hash = isofs_hashi,
145 .d_compare = isofs_dentry_cmpi,
146 },
147#ifdef CONFIG_JOLIET
148 {
149 .d_hash = isofs_hash_ms,
150 .d_compare = isofs_dentry_cmp_ms,
151 },
152 {
153 .d_hash = isofs_hashi_ms,
154 .d_compare = isofs_dentry_cmpi_ms,
Andrew Morton9eb7f2c2005-06-21 17:16:49 -0700155 },
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156#endif
157};
158
159struct iso9660_options{
Jan Kara5404ac82009-06-17 16:26:27 -0700160 unsigned int rock:1;
Bartlomiej Zolnierkiewicz8711c672009-07-10 12:34:27 +0200161 unsigned int joliet:1;
Jan Kara5404ac82009-06-17 16:26:27 -0700162 unsigned int cruft:1;
163 unsigned int hide:1;
164 unsigned int showassoc:1;
165 unsigned int nocompress:1;
166 unsigned int overriderockperm:1;
167 unsigned int uid_set:1;
168 unsigned int gid_set:1;
169 unsigned int utf8:1;
170 unsigned char map;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 unsigned char check;
172 unsigned int blocksize;
Jan Kara9b7880e2008-02-08 04:21:09 -0800173 mode_t fmode;
174 mode_t dmode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 gid_t gid;
176 uid_t uid;
177 char *iocharset;
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700178 /* LVE */
179 s32 session;
180 s32 sbsector;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181};
182
183/*
184 * Compute the hash for the isofs name corresponding to the dentry.
185 */
186static int
Nick Pigginb1e6a012011-01-07 17:49:28 +1100187isofs_hash_common(const struct dentry *dentry, struct qstr *qstr, int ms)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188{
189 const char *name;
190 int len;
191
192 len = qstr->len;
193 name = qstr->name;
194 if (ms) {
195 while (len && name[len-1] == '.')
196 len--;
197 }
198
199 qstr->hash = full_name_hash(name, len);
200
201 return 0;
202}
203
204/*
205 * Compute the hash for the isofs name corresponding to the dentry.
206 */
207static int
Nick Pigginb1e6a012011-01-07 17:49:28 +1100208isofs_hashi_common(const struct dentry *dentry, struct qstr *qstr, int ms)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209{
210 const char *name;
211 int len;
212 char c;
213 unsigned long hash;
214
215 len = qstr->len;
216 name = qstr->name;
217 if (ms) {
218 while (len && name[len-1] == '.')
219 len--;
220 }
221
222 hash = init_name_hash();
223 while (len--) {
224 c = tolower(*name++);
young davef17e1212007-07-15 23:40:17 -0700225 hash = partial_name_hash(c, hash);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 }
227 qstr->hash = end_name_hash(hash);
228
229 return 0;
230}
231
232/*
Nick Piggin621e1552011-01-07 17:49:27 +1100233 * Compare of two isofs names.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 */
Nick Piggin621e1552011-01-07 17:49:27 +1100235static int isofs_dentry_cmp_common(
236 unsigned int len, const char *str,
237 const struct qstr *name, int ms, int ci)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238{
239 int alen, blen;
240
241 /* A filename cannot end in '.' or we treat it like it has none */
Nick Piggin621e1552011-01-07 17:49:27 +1100242 alen = name->len;
243 blen = len;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 if (ms) {
Nick Piggin621e1552011-01-07 17:49:27 +1100245 while (alen && name->name[alen-1] == '.')
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 alen--;
Nick Piggin621e1552011-01-07 17:49:27 +1100247 while (blen && str[blen-1] == '.')
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 blen--;
249 }
250 if (alen == blen) {
Nick Piggin621e1552011-01-07 17:49:27 +1100251 if (ci) {
252 if (strnicmp(name->name, str, alen) == 0)
253 return 0;
254 } else {
255 if (strncmp(name->name, str, alen) == 0)
256 return 0;
257 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 }
259 return 1;
260}
261
262static int
Nick Pigginb1e6a012011-01-07 17:49:28 +1100263isofs_hash(const struct dentry *dentry, const struct inode *inode,
264 struct qstr *qstr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265{
266 return isofs_hash_common(dentry, qstr, 0);
267}
268
269static int
Nick Pigginb1e6a012011-01-07 17:49:28 +1100270isofs_hashi(const struct dentry *dentry, const struct inode *inode,
271 struct qstr *qstr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272{
273 return isofs_hashi_common(dentry, qstr, 0);
274}
275
276static int
Nick Piggin621e1552011-01-07 17:49:27 +1100277isofs_dentry_cmp(const struct dentry *parent, const struct inode *pinode,
278 const struct dentry *dentry, const struct inode *inode,
279 unsigned int len, const char *str, const struct qstr *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280{
Nick Piggin621e1552011-01-07 17:49:27 +1100281 return isofs_dentry_cmp_common(len, str, name, 0, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282}
283
284static int
Nick Piggin621e1552011-01-07 17:49:27 +1100285isofs_dentry_cmpi(const struct dentry *parent, const struct inode *pinode,
286 const struct dentry *dentry, const struct inode *inode,
287 unsigned int len, const char *str, const struct qstr *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288{
Nick Piggin621e1552011-01-07 17:49:27 +1100289 return isofs_dentry_cmp_common(len, str, name, 0, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290}
291
292#ifdef CONFIG_JOLIET
293static int
Nick Pigginb1e6a012011-01-07 17:49:28 +1100294isofs_hash_ms(const struct dentry *dentry, const struct inode *inode,
295 struct qstr *qstr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296{
297 return isofs_hash_common(dentry, qstr, 1);
298}
299
300static int
Nick Pigginb1e6a012011-01-07 17:49:28 +1100301isofs_hashi_ms(const struct dentry *dentry, const struct inode *inode,
302 struct qstr *qstr)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303{
304 return isofs_hashi_common(dentry, qstr, 1);
305}
306
307static int
Nick Piggin621e1552011-01-07 17:49:27 +1100308isofs_dentry_cmp_ms(const struct dentry *parent, const struct inode *pinode,
309 const struct dentry *dentry, const struct inode *inode,
310 unsigned int len, const char *str, const struct qstr *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311{
Nick Piggin621e1552011-01-07 17:49:27 +1100312 return isofs_dentry_cmp_common(len, str, name, 1, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313}
314
315static int
Nick Piggin621e1552011-01-07 17:49:27 +1100316isofs_dentry_cmpi_ms(const struct dentry *parent, const struct inode *pinode,
317 const struct dentry *dentry, const struct inode *inode,
318 unsigned int len, const char *str, const struct qstr *name)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319{
Nick Piggin621e1552011-01-07 17:49:27 +1100320 return isofs_dentry_cmp_common(len, str, name, 1, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321}
322#endif
323
324enum {
325 Opt_block, Opt_check_r, Opt_check_s, Opt_cruft, Opt_gid, Opt_ignore,
326 Opt_iocharset, Opt_map_a, Opt_map_n, Opt_map_o, Opt_mode, Opt_nojoliet,
327 Opt_norock, Opt_sb, Opt_session, Opt_uid, Opt_unhide, Opt_utf8, Opt_err,
Jan Kara52b680c2009-06-17 16:26:25 -0700328 Opt_nocompress, Opt_hide, Opt_showassoc, Opt_dmode, Opt_overriderockperm,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329};
330
Steven Whitehousea447c092008-10-13 10:46:57 +0100331static const match_table_t tokens = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700332 {Opt_norock, "norock"},
333 {Opt_nojoliet, "nojoliet"},
334 {Opt_unhide, "unhide"},
Jeremy White9769f4e2005-06-21 17:16:53 -0700335 {Opt_hide, "hide"},
336 {Opt_showassoc, "showassoc"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337 {Opt_cruft, "cruft"},
338 {Opt_utf8, "utf8"},
339 {Opt_iocharset, "iocharset=%s"},
340 {Opt_map_a, "map=acorn"},
341 {Opt_map_a, "map=a"},
342 {Opt_map_n, "map=normal"},
343 {Opt_map_n, "map=n"},
344 {Opt_map_o, "map=off"},
345 {Opt_map_o, "map=o"},
346 {Opt_session, "session=%u"},
347 {Opt_sb, "sbsector=%u"},
348 {Opt_check_r, "check=relaxed"},
349 {Opt_check_r, "check=r"},
350 {Opt_check_s, "check=strict"},
351 {Opt_check_s, "check=s"},
352 {Opt_uid, "uid=%u"},
353 {Opt_gid, "gid=%u"},
354 {Opt_mode, "mode=%u"},
Jan Kara9b7880e2008-02-08 04:21:09 -0800355 {Opt_dmode, "dmode=%u"},
Jan Kara52b680c2009-06-17 16:26:25 -0700356 {Opt_overriderockperm, "overriderockperm"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 {Opt_block, "block=%u"},
358 {Opt_ignore, "conv=binary"},
359 {Opt_ignore, "conv=b"},
360 {Opt_ignore, "conv=text"},
361 {Opt_ignore, "conv=t"},
362 {Opt_ignore, "conv=mtext"},
363 {Opt_ignore, "conv=m"},
364 {Opt_ignore, "conv=auto"},
365 {Opt_ignore, "conv=a"},
366 {Opt_nocompress, "nocompress"},
367 {Opt_err, NULL}
368};
369
Andrew Morton9eb7f2c2005-06-21 17:16:49 -0700370static int parse_options(char *options, struct iso9660_options *popt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700371{
372 char *p;
373 int option;
374
375 popt->map = 'n';
Jan Kara5404ac82009-06-17 16:26:27 -0700376 popt->rock = 1;
377 popt->joliet = 1;
378 popt->cruft = 0;
379 popt->hide = 0;
380 popt->showassoc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 popt->check = 'u'; /* unset */
382 popt->nocompress = 0;
383 popt->blocksize = 1024;
Jan Kara52b680c2009-06-17 16:26:25 -0700384 popt->fmode = popt->dmode = ISOFS_INVALID_MODE;
Jan Kara5c4a6562009-06-17 16:26:27 -0700385 popt->uid_set = 0;
386 popt->gid_set = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 popt->gid = 0;
388 popt->uid = 0;
389 popt->iocharset = NULL;
390 popt->utf8 = 0;
Jan Kara52b680c2009-06-17 16:26:25 -0700391 popt->overriderockperm = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 popt->session=-1;
393 popt->sbsector=-1;
394 if (!options)
395 return 1;
396
397 while ((p = strsep(&options, ",")) != NULL) {
398 int token;
399 substring_t args[MAX_OPT_ARGS];
400 unsigned n;
401
402 if (!*p)
403 continue;
404
405 token = match_token(p, tokens, args);
406 switch (token) {
407 case Opt_norock:
Jan Kara5404ac82009-06-17 16:26:27 -0700408 popt->rock = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 break;
410 case Opt_nojoliet:
Jan Kara5404ac82009-06-17 16:26:27 -0700411 popt->joliet = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 break;
Jeremy White9769f4e2005-06-21 17:16:53 -0700413 case Opt_hide:
Jan Kara5404ac82009-06-17 16:26:27 -0700414 popt->hide = 1;
Jeremy White9769f4e2005-06-21 17:16:53 -0700415 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 case Opt_unhide:
Jeremy White9769f4e2005-06-21 17:16:53 -0700417 case Opt_showassoc:
Jan Kara5404ac82009-06-17 16:26:27 -0700418 popt->showassoc = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 break;
420 case Opt_cruft:
Jan Kara5404ac82009-06-17 16:26:27 -0700421 popt->cruft = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 break;
423 case Opt_utf8:
424 popt->utf8 = 1;
425 break;
426#ifdef CONFIG_JOLIET
427 case Opt_iocharset:
428 popt->iocharset = match_strdup(&args[0]);
429 break;
430#endif
431 case Opt_map_a:
432 popt->map = 'a';
433 break;
434 case Opt_map_o:
435 popt->map = 'o';
436 break;
437 case Opt_map_n:
438 popt->map = 'n';
439 break;
440 case Opt_session:
441 if (match_int(&args[0], &option))
442 return 0;
443 n = option;
444 if (n > 99)
445 return 0;
446 popt->session = n + 1;
447 break;
448 case Opt_sb:
449 if (match_int(&args[0], &option))
450 return 0;
451 popt->sbsector = option;
452 break;
453 case Opt_check_r:
454 popt->check = 'r';
455 break;
456 case Opt_check_s:
457 popt->check = 's';
458 break;
459 case Opt_ignore:
460 break;
461 case Opt_uid:
462 if (match_int(&args[0], &option))
463 return 0;
464 popt->uid = option;
Jan Kara5c4a6562009-06-17 16:26:27 -0700465 popt->uid_set = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 break;
467 case Opt_gid:
468 if (match_int(&args[0], &option))
469 return 0;
470 popt->gid = option;
Jan Kara5c4a6562009-06-17 16:26:27 -0700471 popt->gid_set = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472 break;
473 case Opt_mode:
474 if (match_int(&args[0], &option))
475 return 0;
Jan Kara9b7880e2008-02-08 04:21:09 -0800476 popt->fmode = option;
477 break;
478 case Opt_dmode:
479 if (match_int(&args[0], &option))
480 return 0;
481 popt->dmode = option;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 break;
Jan Kara52b680c2009-06-17 16:26:25 -0700483 case Opt_overriderockperm:
484 popt->overriderockperm = 1;
485 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 case Opt_block:
487 if (match_int(&args[0], &option))
488 return 0;
489 n = option;
490 if (n != 512 && n != 1024 && n != 2048)
491 return 0;
492 popt->blocksize = n;
493 break;
494 case Opt_nocompress:
495 popt->nocompress = 1;
496 break;
497 default:
498 return 0;
499 }
500 }
501 return 1;
502}
503
504/*
505 * look if the driver can tell the multi session redirection value
506 *
507 * don't change this if you don't know what you do, please!
508 * Multisession is legal only with XA disks.
509 * A non-XA disk with more than one volume descriptor may do it right, but
510 * usually is written in a nowhere standardized "multi-partition" manner.
511 * Multisession uses absolute addressing (solely the first frame of the whole
512 * track is #0), multi-partition uses relative addressing (each first frame of
513 * each track is #0), and a track is not a session.
514 *
515 * A broken CDwriter software or drive firmware does not set new standards,
516 * at least not if conflicting with the existing ones.
517 *
518 * emoenke@gwdg.de
519 */
520#define WE_OBEY_THE_WRITTEN_STANDARDS 1
521
Andrew Morton9eb7f2c2005-06-21 17:16:49 -0700522static unsigned int isofs_get_last_session(struct super_block *sb, s32 session)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523{
524 struct cdrom_multisession ms_info;
525 unsigned int vol_desc_start;
526 struct block_device *bdev = sb->s_bdev;
527 int i;
528
529 vol_desc_start=0;
530 ms_info.addr_format=CDROM_LBA;
531 if(session >= 0 && session <= 99) {
532 struct cdrom_tocentry Te;
533 Te.cdte_track=session;
534 Te.cdte_format=CDROM_LBA;
535 i = ioctl_by_bdev(bdev, CDROMREADTOCENTRY, (unsigned long) &Te);
536 if (!i) {
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700537 printk(KERN_DEBUG "ISOFS: Session %d start %d type %d\n",
538 session, Te.cdte_addr.lba,
539 Te.cdte_ctrl&CDROM_DATA_TRACK);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700540 if ((Te.cdte_ctrl&CDROM_DATA_TRACK) == 4)
541 return Te.cdte_addr.lba;
542 }
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700543
544 printk(KERN_ERR "ISOFS: Invalid session number or type of track\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 }
546 i = ioctl_by_bdev(bdev, CDROMMULTISESSION, (unsigned long) &ms_info);
Andrew Morton9eb7f2c2005-06-21 17:16:49 -0700547 if (session > 0)
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700548 printk(KERN_ERR "ISOFS: Invalid session number\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549#if 0
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700550 printk(KERN_DEBUG "isofs.inode: CDROMMULTISESSION: rc=%d\n",i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 if (i==0) {
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700552 printk(KERN_DEBUG "isofs.inode: XA disk: %s\n",ms_info.xa_flag?"yes":"no");
553 printk(KERN_DEBUG "isofs.inode: vol_desc_start = %d\n", ms_info.addr.lba);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 }
555#endif
556 if (i==0)
557#if WE_OBEY_THE_WRITTEN_STANDARDS
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700558 if (ms_info.xa_flag) /* necessary for a valid ms_info.addr */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559#endif
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700560 vol_desc_start=ms_info.addr.lba;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 return vol_desc_start;
562}
563
564/*
Ondrej Zarye45c9ef2010-10-27 15:33:30 -0700565 * Check if root directory is empty (has less than 3 files).
566 *
567 * Used to detect broken CDs where ISO root directory is empty but Joliet root
568 * directory is OK. If such CD has Rock Ridge extensions, they will be disabled
569 * (and Joliet used instead) or else no files would be visible.
570 */
571static bool rootdir_empty(struct super_block *sb, unsigned long block)
572{
573 int offset = 0, files = 0, de_len;
574 struct iso_directory_record *de;
575 struct buffer_head *bh;
576
577 bh = sb_bread(sb, block);
578 if (!bh)
579 return true;
580 while (files < 3) {
581 de = (struct iso_directory_record *) (bh->b_data + offset);
582 de_len = *(unsigned char *) de;
583 if (de_len == 0)
584 break;
585 files++;
586 offset += de_len;
587 }
588 brelse(bh);
589 return files < 3;
590}
591
592/*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593 * Initialize the superblock and read the root inode.
594 *
595 * Note: a check_disk_change() has been done immediately prior
596 * to this call, so we don't need to check again.
597 */
598static int isofs_fill_super(struct super_block *s, void *data, int silent)
599{
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700600 struct buffer_head *bh = NULL, *pri_bh = NULL;
601 struct hs_primary_descriptor *h_pri = NULL;
602 struct iso_primary_descriptor *pri = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 struct iso_supplementary_descriptor *sec = NULL;
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700604 struct iso_directory_record *rootp;
605 struct inode *inode;
606 struct iso9660_options opt;
607 struct isofs_sb_info *sbi;
608 unsigned long first_data_zone;
609 int joliet_level = 0;
610 int iso_blknum, block;
611 int orig_zonesize;
David Howellsc4386c82008-02-07 00:15:41 -0800612 int table, error = -EINVAL;
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700613 unsigned int vol_desc_start;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614
Miklos Szeredid0132ee2008-02-08 04:21:46 -0800615 save_mount_options(s, data);
616
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700617 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
Arnd Bergmann4f819a72010-09-12 19:05:56 +0200618 if (!sbi)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619 return -ENOMEM;
620 s->s_fs_info = sbi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621
Andrew Morton9eb7f2c2005-06-21 17:16:49 -0700622 if (!parse_options((char *)data, &opt))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623 goto out_freesbi;
624
625 /*
626 * First of all, get the hardware blocksize for this device.
627 * If we don't know what it is, or the hardware blocksize is
628 * larger than the blocksize the user specified, then use
629 * that value.
630 */
631 /*
632 * What if bugger tells us to go beyond page size?
633 */
634 opt.blocksize = sb_min_blocksize(s, opt.blocksize);
635
636 sbi->s_high_sierra = 0; /* default is iso9660 */
637
638 vol_desc_start = (opt.sbsector != -1) ?
639 opt.sbsector : isofs_get_last_session(s,opt.session);
640
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700641 for (iso_blknum = vol_desc_start+16;
642 iso_blknum < vol_desc_start+100; iso_blknum++) {
643 struct hs_volume_descriptor *hdp;
644 struct iso_volume_descriptor *vdp;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700646 block = iso_blknum << (ISOFS_BLOCK_BITS - s->s_blocksize_bits);
647 if (!(bh = sb_bread(s, block)))
648 goto out_no_read;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700650 vdp = (struct iso_volume_descriptor *)bh->b_data;
651 hdp = (struct hs_volume_descriptor *)bh->b_data;
652
653 /*
654 * Due to the overlapping physical location of the descriptors,
655 * ISO CDs can match hdp->id==HS_STANDARD_ID as well. To ensure
656 * proper identification in this case, we first check for ISO.
657 */
658 if (strncmp (vdp->id, ISO_STANDARD_ID, sizeof vdp->id) == 0) {
659 if (isonum_711(vdp->type) == ISO_VD_END)
660 break;
661 if (isonum_711(vdp->type) == ISO_VD_PRIMARY) {
662 if (pri == NULL) {
663 pri = (struct iso_primary_descriptor *)vdp;
664 /* Save the buffer in case we need it ... */
665 pri_bh = bh;
666 bh = NULL;
667 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668 }
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700669#ifdef CONFIG_JOLIET
670 else if (isonum_711(vdp->type) == ISO_VD_SUPPLEMENTARY) {
671 sec = (struct iso_supplementary_descriptor *)vdp;
672 if (sec->escape[0] == 0x25 && sec->escape[1] == 0x2f) {
Bartlomiej Zolnierkiewicz8711c672009-07-10 12:34:27 +0200673 if (opt.joliet) {
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700674 if (sec->escape[2] == 0x40)
675 joliet_level = 1;
676 else if (sec->escape[2] == 0x43)
677 joliet_level = 2;
678 else if (sec->escape[2] == 0x45)
679 joliet_level = 3;
680
681 printk(KERN_DEBUG "ISO 9660 Extensions: "
682 "Microsoft Joliet Level %d\n",
683 joliet_level);
684 }
685 goto root_found;
686 } else {
687 /* Unknown supplementary volume descriptor */
688 sec = NULL;
689 }
690 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691#endif
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700692 } else {
693 if (strncmp (hdp->id, HS_STANDARD_ID, sizeof hdp->id) == 0) {
694 if (isonum_711(hdp->type) != ISO_VD_PRIMARY)
695 goto out_freebh;
696
697 sbi->s_high_sierra = 1;
Jan Kara5404ac82009-06-17 16:26:27 -0700698 opt.rock = 0;
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700699 h_pri = (struct hs_primary_descriptor *)vdp;
700 goto root_found;
701 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700704 /* Just skip any volume descriptors we don't recognize */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700706 brelse(bh);
707 bh = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708 }
709 /*
710 * If we fall through, either no volume descriptor was found,
711 * or else we passed a primary descriptor looking for others.
712 */
713 if (!pri)
714 goto out_unknown_format;
715 brelse(bh);
716 bh = pri_bh;
717 pri_bh = NULL;
718
719root_found:
720
Jan Kara5404ac82009-06-17 16:26:27 -0700721 if (joliet_level && (pri == NULL || !opt.rock)) {
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700722 /* This is the case of Joliet with the norock mount flag.
723 * A disc with both Joliet and Rock Ridge is handled later
724 */
725 pri = (struct iso_primary_descriptor *) sec;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726 }
727
728 if(sbi->s_high_sierra){
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700729 rootp = (struct iso_directory_record *) h_pri->root_directory_record;
730 sbi->s_nzones = isonum_733(h_pri->volume_space_size);
731 sbi->s_log_zone_size = isonum_723(h_pri->logical_block_size);
732 sbi->s_max_size = isonum_733(h_pri->volume_space_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700733 } else {
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700734 if (!pri)
735 goto out_freebh;
736 rootp = (struct iso_directory_record *) pri->root_directory_record;
737 sbi->s_nzones = isonum_733(pri->volume_space_size);
738 sbi->s_log_zone_size = isonum_723(pri->logical_block_size);
739 sbi->s_max_size = isonum_733(pri->volume_space_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740 }
741
742 sbi->s_ninodes = 0; /* No way to figure this out easily */
743
744 orig_zonesize = sbi->s_log_zone_size;
745 /*
746 * If the zone size is smaller than the hardware sector size,
747 * this is a fatal error. This would occur if the disc drive
748 * had sectors that were 2048 bytes, but the filesystem had
749 * blocks that were 512 bytes (which should only very rarely
750 * happen.)
751 */
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700752 if (orig_zonesize < opt.blocksize)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700753 goto out_bad_size;
754
755 /* RDE: convert log zone size to bit shift */
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700756 switch (sbi->s_log_zone_size) {
757 case 512: sbi->s_log_zone_size = 9; break;
758 case 1024: sbi->s_log_zone_size = 10; break;
759 case 2048: sbi->s_log_zone_size = 11; break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700760
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700761 default:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700762 goto out_bad_zone_size;
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700763 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700764
765 s->s_magic = ISOFS_SUPER_MAGIC;
Jan Andres66a362a2010-08-04 22:52:46 +0200766
767 /*
768 * With multi-extent files, file size is only limited by the maximum
769 * size of a file system, which is 8 TB.
770 */
771 s->s_maxbytes = 0x80000000000LL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700773 /*
774 * The CDROM is read-only, has no nodes (devices) on it, and since
775 * all of the files appear to be owned by root, we really do not want
776 * to allow suid. (suid or devices will not show up unless we have
777 * Rock Ridge extensions)
778 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779
780 s->s_flags |= MS_RDONLY /* | MS_NODEV | MS_NOSUID */;
781
782 /* Set this for reference. Its not currently used except on write
783 which we don't have .. */
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700784
785 first_data_zone = isonum_733(rootp->extent) +
786 isonum_711(rootp->ext_attr_length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700787 sbi->s_firstdatazone = first_data_zone;
788#ifndef BEQUIET
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700789 printk(KERN_DEBUG "ISOFS: Max size:%ld Log zone size:%ld\n",
790 sbi->s_max_size, 1UL << sbi->s_log_zone_size);
791 printk(KERN_DEBUG "ISOFS: First datazone:%ld\n", sbi->s_firstdatazone);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792 if(sbi->s_high_sierra)
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700793 printk(KERN_DEBUG "ISOFS: Disc in High Sierra format.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794#endif
795
796 /*
797 * If the Joliet level is set, we _may_ decide to use the
798 * secondary descriptor, but can't be sure until after we
799 * read the root inode. But before reading the root inode
800 * we may need to change the device blocksize, and would
801 * rather release the old buffer first. So, we cache the
802 * first_data_zone value from the secondary descriptor.
803 */
804 if (joliet_level) {
805 pri = (struct iso_primary_descriptor *) sec;
806 rootp = (struct iso_directory_record *)
807 pri->root_directory_record;
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700808 first_data_zone = isonum_733(rootp->extent) +
809 isonum_711(rootp->ext_attr_length);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810 }
811
812 /*
813 * We're all done using the volume descriptor, and may need
814 * to change the device blocksize, so release the buffer now.
815 */
816 brelse(pri_bh);
817 brelse(bh);
818
819 /*
820 * Force the blocksize to 512 for 512 byte sectors. The file
821 * read primitives really get it wrong in a bad way if we don't
822 * do this.
823 *
824 * Note - we should never be setting the blocksize to something
825 * less than the hardware sector size for the device. If we
826 * do, we would end up having to read larger buffers and split
827 * out portions to satisfy requests.
828 *
829 * Note2- the idea here is that we want to deal with the optimal
830 * zonesize in the filesystem. If we have it set to something less,
831 * then we have horrible problems with trying to piece together
832 * bits of adjacent blocks in order to properly read directory
833 * entries. By forcing the blocksize in this way, we ensure
834 * that we will never be required to do this.
835 */
836 sb_set_blocksize(s, orig_zonesize);
837
838 sbi->s_nls_iocharset = NULL;
839
840#ifdef CONFIG_JOLIET
841 if (joliet_level && opt.utf8 == 0) {
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700842 char *p = opt.iocharset ? opt.iocharset : CONFIG_NLS_DEFAULT;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843 sbi->s_nls_iocharset = load_nls(p);
844 if (! sbi->s_nls_iocharset) {
845 /* Fail only if explicit charset specified */
846 if (opt.iocharset)
847 goto out_freesbi;
848 sbi->s_nls_iocharset = load_nls_default();
849 }
850 }
851#endif
852 s->s_op = &isofs_sops;
853 s->s_export_op = &isofs_export_ops;
854 sbi->s_mapping = opt.map;
Jan Kara5404ac82009-06-17 16:26:27 -0700855 sbi->s_rock = (opt.rock ? 2 : 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700856 sbi->s_rock_offset = -1; /* initial offset, will guess until SP is found*/
857 sbi->s_cruft = opt.cruft;
Jeremy White9769f4e2005-06-21 17:16:53 -0700858 sbi->s_hide = opt.hide;
859 sbi->s_showassoc = opt.showassoc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860 sbi->s_uid = opt.uid;
861 sbi->s_gid = opt.gid;
Jan Kara5c4a6562009-06-17 16:26:27 -0700862 sbi->s_uid_set = opt.uid_set;
863 sbi->s_gid_set = opt.gid_set;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864 sbi->s_utf8 = opt.utf8;
865 sbi->s_nocompress = opt.nocompress;
Jan Kara52b680c2009-06-17 16:26:25 -0700866 sbi->s_overriderockperm = opt.overriderockperm;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867 /*
868 * It would be incredibly stupid to allow people to mark every file
869 * on the disk as suid, so we merely allow them to set the default
870 * permissions.
871 */
Jan Kara52b680c2009-06-17 16:26:25 -0700872 if (opt.fmode != ISOFS_INVALID_MODE)
873 sbi->s_fmode = opt.fmode & 0777;
874 else
875 sbi->s_fmode = ISOFS_INVALID_MODE;
876 if (opt.dmode != ISOFS_INVALID_MODE)
877 sbi->s_dmode = opt.dmode & 0777;
878 else
879 sbi->s_dmode = ISOFS_INVALID_MODE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700880
881 /*
882 * Read the root inode, which _may_ result in changing
883 * the s_rock flag. Once we have the final s_rock value,
884 * we then decide whether to use the Joliet descriptor.
885 */
886 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
David Howellsc4386c82008-02-07 00:15:41 -0800887 if (IS_ERR(inode))
888 goto out_no_root;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889
890 /*
Ondrej Zarye45c9ef2010-10-27 15:33:30 -0700891 * Fix for broken CDs with Rock Ridge and empty ISO root directory but
892 * correct Joliet root directory.
893 */
894 if (sbi->s_rock == 1 && joliet_level &&
895 rootdir_empty(s, sbi->s_firstdatazone)) {
896 printk(KERN_NOTICE
897 "ISOFS: primary root directory is empty. "
898 "Disabling Rock Ridge and switching to Joliet.");
899 sbi->s_rock = 0;
900 }
901
902 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700903 * If this disk has both Rock Ridge and Joliet on it, then we
904 * want to use Rock Ridge by default. This can be overridden
905 * by using the norock mount option. There is still one other
906 * possibility that is not taken into account: a Rock Ridge
907 * CD with Unicode names. Until someone sees such a beast, it
908 * will not be supported.
909 */
910 if (sbi->s_rock == 1) {
911 joliet_level = 0;
912 } else if (joliet_level) {
913 sbi->s_rock = 0;
914 if (sbi->s_firstdatazone != first_data_zone) {
915 sbi->s_firstdatazone = first_data_zone;
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700916 printk(KERN_DEBUG
Linus Torvalds1da177e2005-04-16 15:20:36 -0700917 "ISOFS: changing to secondary root\n");
918 iput(inode);
919 inode = isofs_iget(s, sbi->s_firstdatazone, 0);
David Howellsc4386c82008-02-07 00:15:41 -0800920 if (IS_ERR(inode))
921 goto out_no_root;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700922 }
923 }
924
925 if (opt.check == 'u') {
926 /* Only Joliet is case insensitive by default */
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700927 if (joliet_level)
928 opt.check = 'r';
929 else
930 opt.check = 's';
Linus Torvalds1da177e2005-04-16 15:20:36 -0700931 }
932 sbi->s_joliet_level = joliet_level;
933
Kirill Kuvaldin817794e2007-07-31 00:38:58 -0700934 /* Make sure the root inode is a directory */
935 if (!S_ISDIR(inode->i_mode)) {
936 printk(KERN_WARNING
937 "isofs_fill_super: root inode is not a directory. "
938 "Corrupted media?\n");
939 goto out_iput;
940 }
941
Linus Torvalds1da177e2005-04-16 15:20:36 -0700942 table = 0;
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700943 if (joliet_level)
944 table += 2;
945 if (opt.check == 'r')
946 table++;
Al Viro6cc9c1d2010-12-18 10:29:26 -0500947
948 s->s_d_op = &isofs_dentry_ops[table];
949
950 /* get the root dentry */
951 s->s_root = d_alloc_root(inode);
952 if (!(s->s_root))
953 goto out_no_root;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700954
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800955 kfree(opt.iocharset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700956
957 return 0;
958
959 /*
960 * Display error messages and free resources.
961 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700962out_iput:
963 iput(inode);
David Howellsc4386c82008-02-07 00:15:41 -0800964 goto out_no_inode;
965out_no_root:
966 error = PTR_ERR(inode);
967 if (error != -ENOMEM)
968 printk(KERN_WARNING "%s: get root inode failed\n", __func__);
969out_no_inode:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700970#ifdef CONFIG_JOLIET
Thomas Gleixner6d729e42009-08-16 21:05:08 +0000971 unload_nls(sbi->s_nls_iocharset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700972#endif
973 goto out_freesbi;
974out_no_read:
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700975 printk(KERN_WARNING "%s: bread failed, dev=%s, iso_blknum=%d, block=%d\n",
976 __func__, s->s_id, iso_blknum, block);
Linus Torvaldsc11760c2011-06-08 10:30:03 -0700977 goto out_freebh;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700978out_bad_zone_size:
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700979 printk(KERN_WARNING "ISOFS: Bad logical zone size %ld\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700980 sbi->s_log_zone_size);
981 goto out_freebh;
982out_bad_size:
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700983 printk(KERN_WARNING "ISOFS: Logical zone size(%d) < hardware blocksize(%u)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700984 orig_zonesize, opt.blocksize);
985 goto out_freebh;
986out_unknown_format:
987 if (!silent)
Dave Jonesc3ed85a2007-07-15 23:40:03 -0700988 printk(KERN_WARNING "ISOFS: Unable to identify CD-ROM format.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700989
990out_freebh:
991 brelse(bh);
Linus Torvaldsc11760c2011-06-08 10:30:03 -0700992 brelse(pri_bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700993out_freesbi:
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800994 kfree(opt.iocharset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700995 kfree(sbi);
996 s->s_fs_info = NULL;
David Howellsc4386c82008-02-07 00:15:41 -0800997 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700998}
999
David Howells726c3342006-06-23 02:02:58 -07001000static int isofs_statfs (struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001001{
David Howells726c3342006-06-23 02:02:58 -07001002 struct super_block *sb = dentry->d_sb;
Coly Li2430c4d2009-04-02 16:59:38 -07001003 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
David Howells726c3342006-06-23 02:02:58 -07001004
Linus Torvalds1da177e2005-04-16 15:20:36 -07001005 buf->f_type = ISOFS_SUPER_MAGIC;
1006 buf->f_bsize = sb->s_blocksize;
1007 buf->f_blocks = (ISOFS_SB(sb)->s_nzones
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001008 << (ISOFS_SB(sb)->s_log_zone_size - sb->s_blocksize_bits));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001009 buf->f_bfree = 0;
1010 buf->f_bavail = 0;
1011 buf->f_files = ISOFS_SB(sb)->s_ninodes;
1012 buf->f_ffree = 0;
Coly Li2430c4d2009-04-02 16:59:38 -07001013 buf->f_fsid.val[0] = (u32)id;
1014 buf->f_fsid.val[1] = (u32)(id >> 32);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001015 buf->f_namelen = NAME_MAX;
1016 return 0;
1017}
1018
1019/*
1020 * Get a set of blocks; filling in buffer_heads if already allocated
1021 * or getblk() if they are not. Returns the number of blocks inserted
David Howellsc4386c82008-02-07 00:15:41 -08001022 * (-ve == error.)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001023 */
Jan Karafde214d2010-10-04 11:37:37 +02001024int isofs_get_blocks(struct inode *inode, sector_t iblock,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001025 struct buffer_head **bh, unsigned long nblocks)
1026{
Jan Karafde214d2010-10-04 11:37:37 +02001027 unsigned long b_off = iblock;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001028 unsigned offset, sect_size;
1029 unsigned int firstext;
1030 unsigned long nextblk, nextoff;
David Howellsc4386c82008-02-07 00:15:41 -08001031 int section, rv, error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001032 struct iso_inode_info *ei = ISOFS_I(inode);
1033
David Howellsc4386c82008-02-07 00:15:41 -08001034 error = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001035 rv = 0;
Jan Karafde214d2010-10-04 11:37:37 +02001036 if (iblock != b_off) {
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001037 printk(KERN_DEBUG "%s: block number too large\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001038 goto abort;
1039 }
1040
Linus Torvalds1da177e2005-04-16 15:20:36 -07001041
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001042 offset = 0;
1043 firstext = ei->i_first_extent;
1044 sect_size = ei->i_section_size >> ISOFS_BUFFER_BITS(inode);
1045 nextblk = ei->i_next_section_block;
1046 nextoff = ei->i_next_section_offset;
1047 section = 0;
1048
1049 while (nblocks) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001050 /* If we are *way* beyond the end of the file, print a message.
1051 * Access beyond the end of the file up to the next page boundary
1052 * is normal, however because of the way the page cache works.
1053 * In this case, we just return 0 so that we can properly fill
1054 * the page with useless information without generating any
1055 * I/O errors.
1056 */
1057 if (b_off > ((inode->i_size + PAGE_CACHE_SIZE - 1) >> ISOFS_BUFFER_BITS(inode))) {
Jan Karafde214d2010-10-04 11:37:37 +02001058 printk(KERN_DEBUG "%s: block >= EOF (%lu, %llu)\n",
1059 __func__, b_off,
1060 (unsigned long long)inode->i_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001061 goto abort;
1062 }
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001063
Joel & Rebecca VanderZeefb50ae72006-09-29 02:00:30 -07001064 /* On the last section, nextblk == 0, section size is likely to
1065 * exceed sect_size by a partial block, and access beyond the
1066 * end of the file will reach beyond the section size, too.
1067 */
1068 while (nextblk && (b_off >= (offset + sect_size))) {
1069 struct inode *ninode;
1070
1071 offset += sect_size;
1072 ninode = isofs_iget(inode->i_sb, nextblk, nextoff);
David Howellsc4386c82008-02-07 00:15:41 -08001073 if (IS_ERR(ninode)) {
1074 error = PTR_ERR(ninode);
Joel & Rebecca VanderZeefb50ae72006-09-29 02:00:30 -07001075 goto abort;
David Howellsc4386c82008-02-07 00:15:41 -08001076 }
Joel & Rebecca VanderZeefb50ae72006-09-29 02:00:30 -07001077 firstext = ISOFS_I(ninode)->i_first_extent;
1078 sect_size = ISOFS_I(ninode)->i_section_size >> ISOFS_BUFFER_BITS(ninode);
1079 nextblk = ISOFS_I(ninode)->i_next_section_block;
1080 nextoff = ISOFS_I(ninode)->i_next_section_offset;
1081 iput(ninode);
1082
1083 if (++section > 100) {
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001084 printk(KERN_DEBUG "%s: More than 100 file sections ?!?"
1085 " aborting...\n", __func__);
Jan Karafde214d2010-10-04 11:37:37 +02001086 printk(KERN_DEBUG "%s: block=%lu firstext=%u sect_size=%u "
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001087 "nextblk=%lu nextoff=%lu\n", __func__,
Jan Karafde214d2010-10-04 11:37:37 +02001088 b_off, firstext, (unsigned) sect_size,
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001089 nextblk, nextoff);
Joel & Rebecca VanderZeefb50ae72006-09-29 02:00:30 -07001090 goto abort;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001091 }
1092 }
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001093
1094 if (*bh) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001095 map_bh(*bh, inode->i_sb, firstext + b_off - offset);
1096 } else {
1097 *bh = sb_getblk(inode->i_sb, firstext+b_off-offset);
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001098 if (!*bh)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001099 goto abort;
1100 }
1101 bh++; /* Next buffer head */
1102 b_off++; /* Next buffer offset */
1103 nblocks--;
1104 rv++;
1105 }
1106
David Howellsc4386c82008-02-07 00:15:41 -08001107 error = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001108abort:
David Howellsc4386c82008-02-07 00:15:41 -08001109 return rv != 0 ? rv : error;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001110}
1111
1112/*
1113 * Used by the standard interfaces.
1114 */
1115static int isofs_get_block(struct inode *inode, sector_t iblock,
1116 struct buffer_head *bh_result, int create)
1117{
David Howellsc4386c82008-02-07 00:15:41 -08001118 int ret;
1119
Andrew Morton9eb7f2c2005-06-21 17:16:49 -07001120 if (create) {
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001121 printk(KERN_DEBUG "%s: Kernel tries to allocate a block\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001122 return -EROFS;
1123 }
1124
David Howellsc4386c82008-02-07 00:15:41 -08001125 ret = isofs_get_blocks(inode, iblock, &bh_result, 1);
1126 return ret < 0 ? ret : 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001127}
1128
1129static int isofs_bmap(struct inode *inode, sector_t block)
1130{
1131 struct buffer_head dummy;
1132 int error;
1133
1134 dummy.b_state = 0;
1135 dummy.b_blocknr = -1000;
1136 error = isofs_get_block(inode, block, &dummy, 0);
1137 if (!error)
1138 return dummy.b_blocknr;
1139 return 0;
1140}
1141
1142struct buffer_head *isofs_bread(struct inode *inode, sector_t block)
1143{
1144 sector_t blknr = isofs_bmap(inode, block);
1145 if (!blknr)
1146 return NULL;
1147 return sb_bread(inode->i_sb, blknr);
1148}
1149
1150static int isofs_readpage(struct file *file, struct page *page)
1151{
Namjae Jeon30690832011-11-02 13:38:00 -07001152 return mpage_readpage(page, isofs_get_block);
1153}
1154
1155static int isofs_readpages(struct file *file, struct address_space *mapping,
1156 struct list_head *pages, unsigned nr_pages)
1157{
1158 return mpage_readpages(mapping, pages, nr_pages, isofs_get_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001159}
1160
1161static sector_t _isofs_bmap(struct address_space *mapping, sector_t block)
1162{
1163 return generic_block_bmap(mapping,block,isofs_get_block);
1164}
1165
Christoph Hellwigf5e54d62006-06-28 04:26:44 -07001166static const struct address_space_operations isofs_aops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001167 .readpage = isofs_readpage,
Namjae Jeon30690832011-11-02 13:38:00 -07001168 .readpages = isofs_readpages,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001169 .bmap = _isofs_bmap
1170};
1171
Andrew Morton9eb7f2c2005-06-21 17:16:49 -07001172static int isofs_read_level3_size(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001173{
1174 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1175 int high_sierra = ISOFS_SB(inode->i_sb)->s_high_sierra;
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001176 struct buffer_head *bh = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001177 unsigned long block, offset, block_saved, offset_saved;
1178 int i = 0;
1179 int more_entries = 0;
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001180 struct iso_directory_record *tmpde = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001181 struct iso_inode_info *ei = ISOFS_I(inode);
1182
1183 inode->i_size = 0;
1184
1185 /* The first 16 blocks are reserved as the System Area. Thus,
1186 * no inodes can appear in block 0. We use this to flag that
1187 * this is the last section. */
1188 ei->i_next_section_block = 0;
1189 ei->i_next_section_offset = 0;
1190
1191 block = ei->i_iget5_block;
1192 offset = ei->i_iget5_offset;
1193
1194 do {
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001195 struct iso_directory_record *de;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001196 unsigned int de_len;
1197
1198 if (!bh) {
1199 bh = sb_bread(inode->i_sb, block);
1200 if (!bh)
1201 goto out_noread;
1202 }
1203 de = (struct iso_directory_record *) (bh->b_data + offset);
1204 de_len = *(unsigned char *) de;
1205
1206 if (de_len == 0) {
1207 brelse(bh);
1208 bh = NULL;
1209 ++block;
1210 offset = 0;
1211 continue;
1212 }
1213
1214 block_saved = block;
1215 offset_saved = offset;
1216 offset += de_len;
1217
1218 /* Make sure we have a full directory entry */
1219 if (offset >= bufsize) {
1220 int slop = bufsize - offset + de_len;
1221 if (!tmpde) {
1222 tmpde = kmalloc(256, GFP_KERNEL);
1223 if (!tmpde)
1224 goto out_nomem;
1225 }
1226 memcpy(tmpde, de, slop);
1227 offset &= bufsize - 1;
1228 block++;
1229 brelse(bh);
1230 bh = NULL;
1231 if (offset) {
1232 bh = sb_bread(inode->i_sb, block);
1233 if (!bh)
1234 goto out_noread;
Andrew Morton9eb7f2c2005-06-21 17:16:49 -07001235 memcpy((void *)tmpde+slop, bh->b_data, offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001236 }
1237 de = tmpde;
1238 }
1239
1240 inode->i_size += isonum_733(de->size);
1241 if (i == 1) {
1242 ei->i_next_section_block = block_saved;
1243 ei->i_next_section_offset = offset_saved;
1244 }
1245
1246 more_entries = de->flags[-high_sierra] & 0x80;
1247
1248 i++;
Andrew Morton9eb7f2c2005-06-21 17:16:49 -07001249 if (i > 100)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001250 goto out_toomany;
Andrew Morton9eb7f2c2005-06-21 17:16:49 -07001251 } while (more_entries);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001252out:
Andrew Morton9eb7f2c2005-06-21 17:16:49 -07001253 kfree(tmpde);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001254 if (bh)
1255 brelse(bh);
1256 return 0;
1257
1258out_nomem:
1259 if (bh)
1260 brelse(bh);
1261 return -ENOMEM;
1262
1263out_noread:
1264 printk(KERN_INFO "ISOFS: unable to read i-node block %lu\n", block);
Jesper Juhlf99d49a2005-11-07 01:01:34 -08001265 kfree(tmpde);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001266 return -EIO;
1267
1268out_toomany:
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001269 printk(KERN_INFO "%s: More than 100 file sections ?!?, aborting...\n"
1270 "isofs_read_level3_size: inode=%lu\n",
1271 __func__, inode->i_ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001272 goto out;
1273}
1274
David Howellsc4386c82008-02-07 00:15:41 -08001275static int isofs_read_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001276{
1277 struct super_block *sb = inode->i_sb;
1278 struct isofs_sb_info *sbi = ISOFS_SB(sb);
1279 unsigned long bufsize = ISOFS_BUFFER_SIZE(inode);
1280 unsigned long block;
1281 int high_sierra = sbi->s_high_sierra;
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001282 struct buffer_head *bh = NULL;
1283 struct iso_directory_record *de;
1284 struct iso_directory_record *tmpde = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001285 unsigned int de_len;
1286 unsigned long offset;
1287 struct iso_inode_info *ei = ISOFS_I(inode);
David Howellsc4386c82008-02-07 00:15:41 -08001288 int ret = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001289
1290 block = ei->i_iget5_block;
1291 bh = sb_bread(inode->i_sb, block);
1292 if (!bh)
1293 goto out_badread;
1294
1295 offset = ei->i_iget5_offset;
1296
1297 de = (struct iso_directory_record *) (bh->b_data + offset);
1298 de_len = *(unsigned char *) de;
1299
1300 if (offset + de_len > bufsize) {
1301 int frag1 = bufsize - offset;
1302
1303 tmpde = kmalloc(de_len, GFP_KERNEL);
1304 if (tmpde == NULL) {
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001305 printk(KERN_INFO "%s: out of memory\n", __func__);
David Howellsc4386c82008-02-07 00:15:41 -08001306 ret = -ENOMEM;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001307 goto fail;
1308 }
1309 memcpy(tmpde, bh->b_data + offset, frag1);
1310 brelse(bh);
1311 bh = sb_bread(inode->i_sb, ++block);
1312 if (!bh)
1313 goto out_badread;
1314 memcpy((char *)tmpde+frag1, bh->b_data, de_len - frag1);
1315 de = tmpde;
1316 }
1317
1318 inode->i_ino = isofs_get_ino(ei->i_iget5_block,
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001319 ei->i_iget5_offset,
1320 ISOFS_BUFFER_BITS(inode));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001321
1322 /* Assume it is a normal-format file unless told otherwise */
1323 ei->i_file_format = isofs_file_normal;
1324
1325 if (de->flags[-high_sierra] & 2) {
Jan Kara52b680c2009-06-17 16:26:25 -07001326 if (sbi->s_dmode != ISOFS_INVALID_MODE)
1327 inode->i_mode = S_IFDIR | sbi->s_dmode;
1328 else
1329 inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO;
Miklos Szeredibfe86842011-10-28 14:13:29 +02001330 set_nlink(inode, 1); /*
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001331 * Set to 1. We know there are 2, but
1332 * the find utility tries to optimize
1333 * if it is 2, and it screws up. It is
1334 * easier to give 1 which tells find to
1335 * do it the hard way.
1336 */
Linus Torvalds1da177e2005-04-16 15:20:36 -07001337 } else {
Jan Kara52b680c2009-06-17 16:26:25 -07001338 if (sbi->s_fmode != ISOFS_INVALID_MODE) {
1339 inode->i_mode = S_IFREG | sbi->s_fmode;
1340 } else {
1341 /*
1342 * Set default permissions: r-x for all. The disc
1343 * could be shared with DOS machines so virtually
1344 * anything could be a valid executable.
1345 */
1346 inode->i_mode = S_IFREG | S_IRUGO | S_IXUGO;
1347 }
Miklos Szeredibfe86842011-10-28 14:13:29 +02001348 set_nlink(inode, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001349 }
1350 inode->i_uid = sbi->s_uid;
1351 inode->i_gid = sbi->s_gid;
Theodore Ts'oba52de12006-09-27 01:50:49 -07001352 inode->i_blocks = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001353
1354 ei->i_format_parm[0] = 0;
1355 ei->i_format_parm[1] = 0;
1356 ei->i_format_parm[2] = 0;
1357
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001358 ei->i_section_size = isonum_733(de->size);
Andrew Morton9eb7f2c2005-06-21 17:16:49 -07001359 if (de->flags[-high_sierra] & 0x80) {
David Howellsc4386c82008-02-07 00:15:41 -08001360 ret = isofs_read_level3_size(inode);
1361 if (ret < 0)
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001362 goto fail;
David Howellsc4386c82008-02-07 00:15:41 -08001363 ret = -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001364 } else {
1365 ei->i_next_section_block = 0;
1366 ei->i_next_section_offset = 0;
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001367 inode->i_size = isonum_733(de->size);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001368 }
1369
1370 /*
1371 * Some dipshit decided to store some other bit of information
1372 * in the high byte of the file length. Truncate size in case
1373 * this CDROM was mounted with the cruft option.
1374 */
1375
Jan Kara5404ac82009-06-17 16:26:27 -07001376 if (sbi->s_cruft)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001377 inode->i_size &= 0x00ffffff;
1378
1379 if (de->interleave[0]) {
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001380 printk(KERN_DEBUG "ISOFS: Interleaved files not (yet) supported.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -07001381 inode->i_size = 0;
1382 }
1383
1384 /* I have no idea what file_unit_size is used for, so
1385 we will flag it for now */
1386 if (de->file_unit_size[0] != 0) {
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001387 printk(KERN_DEBUG "ISOFS: File unit size != 0 for ISO file (%ld).\n",
1388 inode->i_ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001389 }
1390
1391 /* I have no idea what other flag bits are used for, so
1392 we will flag it for now */
1393#ifdef DEBUG
1394 if((de->flags[-high_sierra] & ~2)!= 0){
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001395 printk(KERN_DEBUG "ISOFS: Unusual flag settings for ISO file "
1396 "(%ld %x).\n",
1397 inode->i_ino, de->flags[-high_sierra]);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001398 }
1399#endif
1400
1401 inode->i_mtime.tv_sec =
1402 inode->i_atime.tv_sec =
1403 inode->i_ctime.tv_sec = iso_date(de->date, high_sierra);
1404 inode->i_mtime.tv_nsec =
1405 inode->i_atime.tv_nsec =
1406 inode->i_ctime.tv_nsec = 0;
1407
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001408 ei->i_first_extent = (isonum_733(de->extent) +
1409 isonum_711(de->ext_attr_length));
Linus Torvalds1da177e2005-04-16 15:20:36 -07001410
1411 /* Set the number of blocks for stat() - should be done before RR */
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001412 inode->i_blocks = (inode->i_size + 511) >> 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001413
1414 /*
1415 * Now test for possible Rock Ridge extensions which will override
1416 * some of these numbers in the inode structure.
1417 */
1418
1419 if (!high_sierra) {
1420 parse_rock_ridge_inode(de, inode);
1421 /* if we want uid/gid set, override the rock ridge setting */
Jan Kara5c4a6562009-06-17 16:26:27 -07001422 if (sbi->s_uid_set)
1423 inode->i_uid = sbi->s_uid;
1424 if (sbi->s_gid_set)
1425 inode->i_gid = sbi->s_gid;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001426 }
Jan Kara52b680c2009-06-17 16:26:25 -07001427 /* Now set final access rights if overriding rock ridge setting */
1428 if (S_ISDIR(inode->i_mode) && sbi->s_overriderockperm &&
1429 sbi->s_dmode != ISOFS_INVALID_MODE)
1430 inode->i_mode = S_IFDIR | sbi->s_dmode;
1431 if (S_ISREG(inode->i_mode) && sbi->s_overriderockperm &&
1432 sbi->s_fmode != ISOFS_INVALID_MODE)
1433 inode->i_mode = S_IFREG | sbi->s_fmode;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001434
1435 /* Install the inode operations vector */
1436 if (S_ISREG(inode->i_mode)) {
1437 inode->i_fop = &generic_ro_fops;
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001438 switch (ei->i_file_format) {
Linus Torvalds1da177e2005-04-16 15:20:36 -07001439#ifdef CONFIG_ZISOFS
1440 case isofs_file_compressed:
1441 inode->i_data.a_ops = &zisofs_aops;
1442 break;
1443#endif
1444 default:
1445 inode->i_data.a_ops = &isofs_aops;
1446 break;
1447 }
1448 } else if (S_ISDIR(inode->i_mode)) {
1449 inode->i_op = &isofs_dir_inode_operations;
1450 inode->i_fop = &isofs_dir_operations;
1451 } else if (S_ISLNK(inode->i_mode)) {
1452 inode->i_op = &page_symlink_inode_operations;
1453 inode->i_data.a_ops = &isofs_symlink_aops;
1454 } else
1455 /* XXX - parse_rock_ridge_inode() had already set i_rdev. */
1456 init_special_inode(inode, inode->i_mode, inode->i_rdev);
1457
David Howellsc4386c82008-02-07 00:15:41 -08001458 ret = 0;
Andrew Morton9eb7f2c2005-06-21 17:16:49 -07001459out:
Jesper Juhlf99d49a2005-11-07 01:01:34 -08001460 kfree(tmpde);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001461 if (bh)
1462 brelse(bh);
David Howellsc4386c82008-02-07 00:15:41 -08001463 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001464
Andrew Morton9eb7f2c2005-06-21 17:16:49 -07001465out_badread:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001466 printk(KERN_WARNING "ISOFS: unable to read i-node block\n");
Andrew Morton9eb7f2c2005-06-21 17:16:49 -07001467fail:
Linus Torvalds1da177e2005-04-16 15:20:36 -07001468 goto out;
1469}
1470
1471struct isofs_iget5_callback_data {
1472 unsigned long block;
1473 unsigned long offset;
1474};
1475
1476static int isofs_iget5_test(struct inode *ino, void *data)
1477{
1478 struct iso_inode_info *i = ISOFS_I(ino);
1479 struct isofs_iget5_callback_data *d =
1480 (struct isofs_iget5_callback_data*)data;
1481 return (i->i_iget5_block == d->block)
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001482 && (i->i_iget5_offset == d->offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001483}
1484
1485static int isofs_iget5_set(struct inode *ino, void *data)
1486{
1487 struct iso_inode_info *i = ISOFS_I(ino);
1488 struct isofs_iget5_callback_data *d =
1489 (struct isofs_iget5_callback_data*)data;
1490 i->i_iget5_block = d->block;
1491 i->i_iget5_offset = d->offset;
1492 return 0;
1493}
1494
1495/* Store, in the inode's containing structure, the block and block
1496 * offset that point to the underlying meta-data for the inode. The
1497 * code below is otherwise similar to the iget() code in
1498 * include/linux/fs.h */
1499struct inode *isofs_iget(struct super_block *sb,
1500 unsigned long block,
1501 unsigned long offset)
1502{
1503 unsigned long hashval;
1504 struct inode *inode;
1505 struct isofs_iget5_callback_data data;
David Howellsc4386c82008-02-07 00:15:41 -08001506 long ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -07001507
1508 if (offset >= 1ul << sb->s_blocksize_bits)
David Howellsc4386c82008-02-07 00:15:41 -08001509 return ERR_PTR(-EINVAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001510
1511 data.block = block;
1512 data.offset = offset;
1513
1514 hashval = (block << sb->s_blocksize_bits) | offset;
1515
Andrew Morton9eb7f2c2005-06-21 17:16:49 -07001516 inode = iget5_locked(sb, hashval, &isofs_iget5_test,
Dave Jonesc3ed85a2007-07-15 23:40:03 -07001517 &isofs_iget5_set, &data);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001518
David Howellsc4386c82008-02-07 00:15:41 -08001519 if (!inode)
1520 return ERR_PTR(-ENOMEM);
1521
1522 if (inode->i_state & I_NEW) {
1523 ret = isofs_read_inode(inode);
1524 if (ret < 0) {
1525 iget_failed(inode);
1526 inode = ERR_PTR(ret);
1527 } else {
1528 unlock_new_inode(inode);
1529 }
Linus Torvalds1da177e2005-04-16 15:20:36 -07001530 }
1531
1532 return inode;
1533}
1534
Al Viro152a0832010-07-25 00:46:55 +04001535static struct dentry *isofs_mount(struct file_system_type *fs_type,
1536 int flags, const char *dev_name, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -07001537{
Al Viro152a0832010-07-25 00:46:55 +04001538 return mount_bdev(fs_type, flags, dev_name, data, isofs_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -07001539}
1540
1541static struct file_system_type iso9660_fs_type = {
1542 .owner = THIS_MODULE,
1543 .name = "iso9660",
Al Viro152a0832010-07-25 00:46:55 +04001544 .mount = isofs_mount,
Linus Torvalds1da177e2005-04-16 15:20:36 -07001545 .kill_sb = kill_block_super,
1546 .fs_flags = FS_REQUIRES_DEV,
1547};
1548
1549static int __init init_iso9660_fs(void)
1550{
1551 int err = init_inodecache();
1552 if (err)
1553 goto out;
1554#ifdef CONFIG_ZISOFS
1555 err = zisofs_init();
1556 if (err)
1557 goto out1;
1558#endif
1559 err = register_filesystem(&iso9660_fs_type);
1560 if (err)
1561 goto out2;
1562 return 0;
1563out2:
1564#ifdef CONFIG_ZISOFS
1565 zisofs_cleanup();
1566out1:
1567#endif
1568 destroy_inodecache();
1569out:
1570 return err;
1571}
1572
1573static void __exit exit_iso9660_fs(void)
1574{
1575 unregister_filesystem(&iso9660_fs_type);
1576#ifdef CONFIG_ZISOFS
1577 zisofs_cleanup();
1578#endif
1579 destroy_inodecache();
1580}
1581
1582module_init(init_iso9660_fs)
1583module_exit(exit_iso9660_fs)
1584MODULE_LICENSE("GPL");
1585/* Actual filesystem name is iso9660, as requested in filesystems.c */
1586MODULE_ALIAS("iso9660");