blob: a3076228523db4db7a105a966f6049a8570b705c [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/hpfs/super.c
3 *
4 * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
5 *
6 * mounting, unmounting, error handling
7 */
8
9#include "hpfs_fn.h"
10#include <linux/module.h>
11#include <linux/parser.h>
12#include <linux/init.h>
13#include <linux/statfs.h>
Jeff Garzike18fa702006-09-24 11:13:19 -040014#include <linux/magic.h>
Alexey Dobriyane8edc6e2007-05-21 01:22:52 +040015#include <linux/sched.h>
Akinobu Mitaf4c54fc2009-12-15 16:46:56 -080016#include <linux/bitmap.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090017#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070018
19/* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */
20
Mikulas Patockadab4c82a2011-05-08 20:44:08 +020021static void mark_dirty(struct super_block *s, int remount)
Linus Torvalds1da177e2005-04-16 15:20:36 -070022{
Mikulas Patockadab4c82a2011-05-08 20:44:08 +020023 if (hpfs_sb(s)->sb_chkdsk && (remount || !(s->s_flags & MS_RDONLY))) {
Linus Torvalds1da177e2005-04-16 15:20:36 -070024 struct buffer_head *bh;
25 struct hpfs_spare_block *sb;
26 if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
27 sb->dirty = 1;
28 sb->old_wrote = 0;
29 mark_buffer_dirty(bh);
Mikulas Patockaf7397682011-05-08 20:43:41 +020030 sync_dirty_buffer(bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -070031 brelse(bh);
32 }
33 }
34}
35
36/* Mark the filesystem clean (mark it dirty for chkdsk if chkdsk==2 or if there
37 were errors) */
38
39static void unmark_dirty(struct super_block *s)
40{
41 struct buffer_head *bh;
42 struct hpfs_spare_block *sb;
43 if (s->s_flags & MS_RDONLY) return;
Mikulas Patockaf7397682011-05-08 20:43:41 +020044 sync_blockdev(s->s_bdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070045 if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
46 sb->dirty = hpfs_sb(s)->sb_chkdsk > 1 - hpfs_sb(s)->sb_was_error;
47 sb->old_wrote = hpfs_sb(s)->sb_chkdsk >= 2 && !hpfs_sb(s)->sb_was_error;
48 mark_buffer_dirty(bh);
Mikulas Patockaf7397682011-05-08 20:43:41 +020049 sync_dirty_buffer(bh);
Linus Torvalds1da177e2005-04-16 15:20:36 -070050 brelse(bh);
51 }
52}
53
54/* Filesystem error... */
Alexey Dobriyan352d94d2006-12-06 20:37:04 -080055static char err_buf[1024];
Linus Torvalds1da177e2005-04-16 15:20:36 -070056
Alexey Dobriyan352d94d2006-12-06 20:37:04 -080057void hpfs_error(struct super_block *s, const char *fmt, ...)
Linus Torvalds1da177e2005-04-16 15:20:36 -070058{
Alexey Dobriyan352d94d2006-12-06 20:37:04 -080059 va_list args;
60
61 va_start(args, fmt);
62 vsnprintf(err_buf, sizeof(err_buf), fmt, args);
63 va_end(args);
64
65 printk("HPFS: filesystem error: %s", err_buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -070066 if (!hpfs_sb(s)->sb_was_error) {
67 if (hpfs_sb(s)->sb_err == 2) {
68 printk("; crashing the system because you wanted it\n");
Mikulas Patockadab4c82a2011-05-08 20:44:08 +020069 mark_dirty(s, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -070070 panic("HPFS panic");
71 } else if (hpfs_sb(s)->sb_err == 1) {
72 if (s->s_flags & MS_RDONLY) printk("; already mounted read-only\n");
73 else {
74 printk("; remounting read-only\n");
Mikulas Patockadab4c82a2011-05-08 20:44:08 +020075 mark_dirty(s, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -070076 s->s_flags |= MS_RDONLY;
77 }
78 } else if (s->s_flags & MS_RDONLY) printk("; going on - but anything won't be destroyed because it's read-only\n");
79 else printk("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n");
80 } else printk("\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 hpfs_sb(s)->sb_was_error = 1;
82}
83
84/*
85 * A little trick to detect cycles in many hpfs structures and don't let the
86 * kernel crash on corrupted filesystem. When first called, set c2 to 0.
87 *
88 * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories
89 * nested each in other, chkdsk locked up happilly.
90 */
91
92int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2,
93 char *msg)
94{
95 if (*c2 && *c1 == key) {
96 hpfs_error(s, "cycle detected on key %08x in %s", key, msg);
97 return 1;
98 }
99 (*c2)++;
100 if (!((*c2 - 1) & *c2)) *c1 = key;
101 return 0;
102}
103
104static void hpfs_put_super(struct super_block *s)
105{
106 struct hpfs_sb_info *sbi = hpfs_sb(s);
Christoph Hellwig6cfd0142009-05-05 15:40:36 +0200107
Mikulas Patocka7dd29d82011-05-08 20:42:54 +0200108 hpfs_lock(s);
109 unmark_dirty(s);
110 hpfs_unlock(s);
111
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800112 kfree(sbi->sb_cp_table);
113 kfree(sbi->sb_bmp_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 s->s_fs_info = NULL;
115 kfree(sbi);
116}
117
118unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
119{
120 struct quad_buffer_head qbh;
Akinobu Mitaf4c54fc2009-12-15 16:46:56 -0800121 unsigned long *bits;
122 unsigned count;
123
124 bits = hpfs_map_4sectors(s, secno, &qbh, 4);
125 if (!bits)
126 return 0;
127 count = bitmap_weight(bits, 2048 * BITS_PER_BYTE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 hpfs_brelse4(&qbh);
129 return count;
130}
131
132static unsigned count_bitmaps(struct super_block *s)
133{
134 unsigned n, count, n_bands;
135 n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14;
136 count = 0;
137 for (n = 0; n < n_bands; n++)
Mikulas Patocka0b697602011-05-08 20:44:26 +0200138 count += hpfs_count_one_bitmap(s, le32_to_cpu(hpfs_sb(s)->sb_bmp_dir[n]));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 return count;
140}
141
David Howells726c3342006-06-23 02:02:58 -0700142static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143{
David Howells726c3342006-06-23 02:02:58 -0700144 struct super_block *s = dentry->d_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 struct hpfs_sb_info *sbi = hpfs_sb(s);
Coly Li604d2952009-04-02 16:59:37 -0700146 u64 id = huge_encode_dev(s->s_bdev->bd_dev);
Arnd Bergmann9a311b92011-01-22 20:26:12 +0100147 hpfs_lock(s);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148
149 /*if (sbi->sb_n_free == -1) {*/
150 sbi->sb_n_free = count_bitmaps(s);
151 sbi->sb_n_free_dnodes = hpfs_count_one_bitmap(s, sbi->sb_dmap);
152 /*}*/
153 buf->f_type = s->s_magic;
154 buf->f_bsize = 512;
155 buf->f_blocks = sbi->sb_fs_size;
156 buf->f_bfree = sbi->sb_n_free;
157 buf->f_bavail = sbi->sb_n_free;
158 buf->f_files = sbi->sb_dirband_size / 4;
159 buf->f_ffree = sbi->sb_n_free_dnodes;
Coly Li604d2952009-04-02 16:59:37 -0700160 buf->f_fsid.val[0] = (u32)id;
161 buf->f_fsid.val[1] = (u32)(id >> 32);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162 buf->f_namelen = 254;
163
Arnd Bergmann9a311b92011-01-22 20:26:12 +0100164 hpfs_unlock(s);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165
166 return 0;
167}
168
Christoph Lametere18b8902006-12-06 20:33:20 -0800169static struct kmem_cache * hpfs_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170
171static struct inode *hpfs_alloc_inode(struct super_block *sb)
172{
173 struct hpfs_inode_info *ei;
Christoph Lametere6b4f8d2006-12-06 20:33:14 -0800174 ei = (struct hpfs_inode_info *)kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 if (!ei)
176 return NULL;
177 ei->vfs_inode.i_version = 1;
178 return &ei->vfs_inode;
179}
180
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100181static void hpfs_i_callback(struct rcu_head *head)
182{
183 struct inode *inode = container_of(head, struct inode, i_rcu);
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100184 kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
185}
186
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187static void hpfs_destroy_inode(struct inode *inode)
188{
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100189 call_rcu(&inode->i_rcu, hpfs_i_callback);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190}
191
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700192static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193{
194 struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;
195
Christoph Lametera35afb82007-05-16 22:10:57 -0700196 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197}
Paul Mundt20c2df82007-07-20 10:11:58 +0900198
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199static int init_inodecache(void)
200{
201 hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache",
202 sizeof(struct hpfs_inode_info),
Paul Jacksonfffb60f2006-03-24 03:16:06 -0800203 0, (SLAB_RECLAIM_ACCOUNT|
204 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +0900205 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 if (hpfs_inode_cachep == NULL)
207 return -ENOMEM;
208 return 0;
209}
210
211static void destroy_inodecache(void)
212{
Kirill A. Shutemov8c0a8532012-09-26 11:33:07 +1000213 /*
214 * Make sure all delayed rcu free inodes are flushed before we
215 * destroy cache.
216 */
217 rcu_barrier();
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -0700218 kmem_cache_destroy(hpfs_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219}
220
221/*
222 * A tiny parser for option strings, stolen from dosfs.
223 * Stolen again from read-only hpfs.
224 * And updated for table-driven option parsing.
225 */
226
227enum {
228 Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700229 Opt_check_none, Opt_check_normal, Opt_check_strict,
230 Opt_err_cont, Opt_err_ro, Opt_err_panic,
231 Opt_eas_no, Opt_eas_ro, Opt_eas_rw,
232 Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always,
233 Opt_timeshift, Opt_err,
234};
235
Steven Whitehousea447c092008-10-13 10:46:57 +0100236static const match_table_t tokens = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 {Opt_help, "help"},
238 {Opt_uid, "uid=%u"},
239 {Opt_gid, "gid=%u"},
240 {Opt_umask, "umask=%o"},
241 {Opt_case_lower, "case=lower"},
242 {Opt_case_asis, "case=asis"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 {Opt_check_none, "check=none"},
244 {Opt_check_normal, "check=normal"},
245 {Opt_check_strict, "check=strict"},
246 {Opt_err_cont, "errors=continue"},
247 {Opt_err_ro, "errors=remount-ro"},
248 {Opt_err_panic, "errors=panic"},
249 {Opt_eas_no, "eas=no"},
250 {Opt_eas_ro, "eas=ro"},
251 {Opt_eas_rw, "eas=rw"},
252 {Opt_chkdsk_no, "chkdsk=no"},
253 {Opt_chkdsk_errors, "chkdsk=errors"},
254 {Opt_chkdsk_always, "chkdsk=always"},
255 {Opt_timeshift, "timeshift=%d"},
256 {Opt_err, NULL},
257};
258
Eric W. Biederman0e1a43c2012-02-07 16:27:53 -0800259static int parse_opts(char *opts, kuid_t *uid, kgid_t *gid, umode_t *umask,
Mikulas Patocka0fe105a2011-05-08 20:43:19 +0200260 int *lowercase, int *eas, int *chk, int *errs,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 int *chkdsk, int *timeshift)
262{
263 char *p;
264 int option;
265
266 if (!opts)
267 return 1;
268
269 /*printk("Parsing opts: '%s'\n",opts);*/
270
271 while ((p = strsep(&opts, ",")) != NULL) {
272 substring_t args[MAX_OPT_ARGS];
273 int token;
274 if (!*p)
275 continue;
276
277 token = match_token(p, tokens, args);
278 switch (token) {
279 case Opt_help:
280 return 2;
281 case Opt_uid:
282 if (match_int(args, &option))
283 return 0;
Eric W. Biederman0e1a43c2012-02-07 16:27:53 -0800284 *uid = make_kuid(current_user_ns(), option);
285 if (!uid_valid(*uid))
286 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 break;
288 case Opt_gid:
289 if (match_int(args, &option))
290 return 0;
Eric W. Biederman0e1a43c2012-02-07 16:27:53 -0800291 *gid = make_kgid(current_user_ns(), option);
292 if (!gid_valid(*gid))
293 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294 break;
295 case Opt_umask:
296 if (match_octal(args, &option))
297 return 0;
298 *umask = option;
299 break;
300 case Opt_case_lower:
301 *lowercase = 1;
302 break;
303 case Opt_case_asis:
304 *lowercase = 0;
305 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 case Opt_check_none:
307 *chk = 0;
308 break;
309 case Opt_check_normal:
310 *chk = 1;
311 break;
312 case Opt_check_strict:
313 *chk = 2;
314 break;
315 case Opt_err_cont:
316 *errs = 0;
317 break;
318 case Opt_err_ro:
319 *errs = 1;
320 break;
321 case Opt_err_panic:
322 *errs = 2;
323 break;
324 case Opt_eas_no:
325 *eas = 0;
326 break;
327 case Opt_eas_ro:
328 *eas = 1;
329 break;
330 case Opt_eas_rw:
331 *eas = 2;
332 break;
333 case Opt_chkdsk_no:
334 *chkdsk = 0;
335 break;
336 case Opt_chkdsk_errors:
337 *chkdsk = 1;
338 break;
339 case Opt_chkdsk_always:
340 *chkdsk = 2;
341 break;
342 case Opt_timeshift:
343 {
344 int m = 1;
345 char *rhs = args[0].from;
346 if (!rhs || !*rhs)
347 return 0;
348 if (*rhs == '-') m = -1;
349 if (*rhs == '+' || *rhs == '-') rhs++;
350 *timeshift = simple_strtoul(rhs, &rhs, 0) * m;
351 if (*rhs)
352 return 0;
353 break;
354 }
355 default:
356 return 0;
357 }
358 }
359 return 1;
360}
361
362static inline void hpfs_help(void)
363{
364 printk("\n\
365HPFS filesystem options:\n\
366 help do not mount and display this text\n\
367 uid=xxx set uid of files that don't have uid specified in eas\n\
368 gid=xxx set gid of files that don't have gid specified in eas\n\
369 umask=xxx set mode of files that don't have mode specified in eas\n\
370 case=lower lowercase all files\n\
371 case=asis do not lowercase files (default)\n\
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 check=none no fs checks - kernel may crash on corrupted filesystem\n\
373 check=normal do some checks - it should not crash (default)\n\
374 check=strict do extra time-consuming checks, used for debugging\n\
375 errors=continue continue on errors\n\
376 errors=remount-ro remount read-only if errors found (default)\n\
377 errors=panic panic on errors\n\
378 chkdsk=no do not mark fs for chkdsking even if there were errors\n\
379 chkdsk=errors mark fs dirty if errors found (default)\n\
380 chkdsk=always always mark fs dirty - used for debugging\n\
381 eas=no ignore extended attributes\n\
382 eas=ro read but do not write extended attributes\n\
383 eas=rw r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
384 timeshift=nnn add nnn seconds to file times\n\
385\n");
386}
387
388static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
389{
Eric W. Biederman0e1a43c2012-02-07 16:27:53 -0800390 kuid_t uid;
391 kgid_t gid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 umode_t umask;
Mikulas Patocka0fe105a2011-05-08 20:43:19 +0200393 int lowercase, eas, chk, errs, chkdsk, timeshift;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 int o;
395 struct hpfs_sb_info *sbi = hpfs_sb(s);
Miklos Szeredi6d9c1fd2008-02-08 04:21:44 -0800396 char *new_opts = kstrdup(data, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700397
398 *flags |= MS_NOATIME;
399
Arnd Bergmann9a311b92011-01-22 20:26:12 +0100400 hpfs_lock(s);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 uid = sbi->sb_uid; gid = sbi->sb_gid;
402 umask = 0777 & ~sbi->sb_mode;
Mikulas Patocka0fe105a2011-05-08 20:43:19 +0200403 lowercase = sbi->sb_lowercase;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk;
405 errs = sbi->sb_err; timeshift = sbi->sb_timeshift;
406
Mikulas Patocka0fe105a2011-05-08 20:43:19 +0200407 if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 &eas, &chk, &errs, &chkdsk, &timeshift))) {
409 printk("HPFS: bad mount options.\n");
Miklos Szeredi6d9c1fd2008-02-08 04:21:44 -0800410 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 }
412 if (o == 2) {
413 hpfs_help();
Miklos Szeredi6d9c1fd2008-02-08 04:21:44 -0800414 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 }
416 if (timeshift != sbi->sb_timeshift) {
417 printk("HPFS: timeshift can't be changed using remount.\n");
Miklos Szeredi6d9c1fd2008-02-08 04:21:44 -0800418 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 }
420
421 unmark_dirty(s);
422
423 sbi->sb_uid = uid; sbi->sb_gid = gid;
424 sbi->sb_mode = 0777 & ~umask;
Mikulas Patocka0fe105a2011-05-08 20:43:19 +0200425 sbi->sb_lowercase = lowercase;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk;
427 sbi->sb_err = errs; sbi->sb_timeshift = timeshift;
428
Mikulas Patockadab4c82a2011-05-08 20:44:08 +0200429 if (!(*flags & MS_RDONLY)) mark_dirty(s, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430
Al Viro2a32ceb2009-05-08 16:05:57 -0400431 replace_mount_options(s, new_opts);
Miklos Szeredi6d9c1fd2008-02-08 04:21:44 -0800432
Arnd Bergmann9a311b92011-01-22 20:26:12 +0100433 hpfs_unlock(s);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700434 return 0;
Miklos Szeredi6d9c1fd2008-02-08 04:21:44 -0800435
436out_err:
Arnd Bergmann9a311b92011-01-22 20:26:12 +0100437 hpfs_unlock(s);
Miklos Szeredi6d9c1fd2008-02-08 04:21:44 -0800438 kfree(new_opts);
439 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700440}
441
442/* Super operations */
443
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800444static const struct super_operations hpfs_sops =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445{
446 .alloc_inode = hpfs_alloc_inode,
447 .destroy_inode = hpfs_destroy_inode,
Al Viroea544002010-06-07 00:18:40 -0400448 .evict_inode = hpfs_evict_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 .put_super = hpfs_put_super,
450 .statfs = hpfs_statfs,
451 .remount_fs = hpfs_remount_fs,
Miklos Szeredi6d9c1fd2008-02-08 04:21:44 -0800452 .show_options = generic_show_options,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453};
454
455static int hpfs_fill_super(struct super_block *s, void *options, int silent)
456{
457 struct buffer_head *bh0, *bh1, *bh2;
458 struct hpfs_boot_block *bootblock;
459 struct hpfs_super_block *superblock;
460 struct hpfs_spare_block *spareblock;
461 struct hpfs_sb_info *sbi;
462 struct inode *root;
463
Eric W. Biederman0e1a43c2012-02-07 16:27:53 -0800464 kuid_t uid;
465 kgid_t gid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 umode_t umask;
Mikulas Patocka0fe105a2011-05-08 20:43:19 +0200467 int lowercase, eas, chk, errs, chkdsk, timeshift;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468
469 dnode_secno root_dno;
470 struct hpfs_dirent *de = NULL;
471 struct quad_buffer_head qbh;
472
473 int o;
474
Miklos Szeredi6d9c1fd2008-02-08 04:21:44 -0800475 save_mount_options(s, options);
476
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700477 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
Jan Blunckdb719222010-08-15 22:51:10 +0200478 if (!sbi) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 return -ENOMEM;
Jan Blunckdb719222010-08-15 22:51:10 +0200480 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700481 s->s_fs_info = sbi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482
483 sbi->sb_bmp_dir = NULL;
484 sbi->sb_cp_table = NULL;
485
Mikulas Patocka7dd29d82011-05-08 20:42:54 +0200486 mutex_init(&sbi->hpfs_mutex);
487 hpfs_lock(s);
488
David Howellsde395b82008-11-14 10:38:55 +1100489 uid = current_uid();
490 gid = current_gid();
Al Viroce3b0f82009-03-29 19:08:22 -0400491 umask = current_umask();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492 lowercase = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 eas = 2;
494 chk = 1;
495 errs = 1;
496 chkdsk = 1;
497 timeshift = 0;
498
Mikulas Patocka0fe105a2011-05-08 20:43:19 +0200499 if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 &eas, &chk, &errs, &chkdsk, &timeshift))) {
501 printk("HPFS: bad mount options.\n");
502 goto bail0;
503 }
504 if (o==2) {
505 hpfs_help();
506 goto bail0;
507 }
508
509 /*sbi->sb_mounting = 1;*/
510 sb_set_blocksize(s, 512);
511 sbi->sb_fs_size = -1;
512 if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
513 if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
514 if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;
515
516 /* Check magics */
Mikulas Patocka0b697602011-05-08 20:44:26 +0200517 if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC
518 ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC
519 || le32_to_cpu(spareblock->magic) != SP_MAGIC) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 if (!silent) printk("HPFS: Bad magic ... probably not HPFS\n");
521 goto bail4;
522 }
523
524 /* Check version */
525 if (!(s->s_flags & MS_RDONLY) &&
526 superblock->funcversion != 2 && superblock->funcversion != 3) {
527 printk("HPFS: Bad version %d,%d. Mount readonly to go around\n",
528 (int)superblock->version, (int)superblock->funcversion);
529 printk("HPFS: please try recent version of HPFS driver at http://artax.karlin.mff.cuni.cz/~mikulas/vyplody/hpfs/index-e.cgi and if it still can't understand this format, contact author - mikulas@artax.karlin.mff.cuni.cz\n");
530 goto bail4;
531 }
532
533 s->s_flags |= MS_NOATIME;
534
535 /* Fill superblock stuff */
536 s->s_magic = HPFS_SUPER_MAGIC;
537 s->s_op = &hpfs_sops;
Al Viro43d344d2011-01-12 16:12:05 -0500538 s->s_d_op = &hpfs_dentry_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539
Mikulas Patocka0b697602011-05-08 20:44:26 +0200540 sbi->sb_root = le32_to_cpu(superblock->root);
541 sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors);
542 sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps);
543 sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start);
544 sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band);
545 sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 sbi->sb_uid = uid;
547 sbi->sb_gid = gid;
548 sbi->sb_mode = 0777 & ~umask;
549 sbi->sb_n_free = -1;
550 sbi->sb_n_free_dnodes = -1;
551 sbi->sb_lowercase = lowercase;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552 sbi->sb_eas = eas;
553 sbi->sb_chk = chk;
554 sbi->sb_chkdsk = chkdsk;
555 sbi->sb_err = errs;
556 sbi->sb_timeshift = timeshift;
557 sbi->sb_was_error = 0;
558 sbi->sb_cp_table = NULL;
559 sbi->sb_c_bitmap = -1;
560 sbi->sb_max_fwd_alloc = 0xffffff;
561
562 /* Load bitmap directory */
Mikulas Patocka0b697602011-05-08 20:44:26 +0200563 if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps))))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564 goto bail4;
565
566 /* Check for general fs errors*/
567 if (spareblock->dirty && !spareblock->old_wrote) {
568 if (errs == 2) {
569 printk("HPFS: Improperly stopped, not mounted\n");
570 goto bail4;
571 }
572 hpfs_error(s, "improperly stopped");
573 }
574
575 if (!(s->s_flags & MS_RDONLY)) {
576 spareblock->dirty = 1;
577 spareblock->old_wrote = 0;
578 mark_buffer_dirty(bh2);
579 }
580
Al Viro28fe3c12012-04-17 16:41:13 -0400581 if (spareblock->hotfixes_used || spareblock->n_spares_used) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582 if (errs >= 2) {
583 printk("HPFS: Hotfixes not supported here, try chkdsk\n");
Mikulas Patockadab4c82a2011-05-08 20:44:08 +0200584 mark_dirty(s, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700585 goto bail4;
586 }
587 hpfs_error(s, "hotfixes not supported here, try chkdsk");
588 if (errs == 0) printk("HPFS: Proceeding, but your filesystem will be probably corrupted by this driver...\n");
589 else printk("HPFS: This driver may read bad files or crash when operating on disk with hotfixes.\n");
590 }
Mikulas Patocka0b697602011-05-08 20:44:26 +0200591 if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592 if (errs >= 2) {
593 printk("HPFS: Spare dnodes used, try chkdsk\n");
Mikulas Patockadab4c82a2011-05-08 20:44:08 +0200594 mark_dirty(s, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595 goto bail4;
596 }
597 hpfs_error(s, "warning: spare dnodes used, try chkdsk");
598 if (errs == 0) printk("HPFS: Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
599 }
600 if (chk) {
601 unsigned a;
Mikulas Patocka0b697602011-05-08 20:44:26 +0200602 if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) ||
603 le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604 hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
Mikulas Patocka0b697602011-05-08 20:44:26 +0200605 le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 goto bail4;
607 }
608 a = sbi->sb_dirband_size;
609 sbi->sb_dirband_size = 0;
Mikulas Patocka0b697602011-05-08 20:44:26 +0200610 if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") ||
611 hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") ||
612 hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) {
Mikulas Patockadab4c82a2011-05-08 20:44:08 +0200613 mark_dirty(s, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614 goto bail4;
615 }
616 sbi->sb_dirband_size = a;
617 } else printk("HPFS: You really don't want any checks? You are crazy...\n");
618
619 /* Load code page table */
Mikulas Patocka0b697602011-05-08 20:44:26 +0200620 if (le32_to_cpu(spareblock->n_code_pages))
621 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir))))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622 printk("HPFS: Warning: code page support is disabled\n");
623
624 brelse(bh2);
625 brelse(bh1);
626 brelse(bh0);
627
628 root = iget_locked(s, sbi->sb_root);
629 if (!root)
630 goto bail0;
631 hpfs_init_inode(root);
632 hpfs_read_inode(root);
633 unlock_new_inode(root);
Al Viro48fde702012-01-08 22:15:13 -0500634 s->s_root = d_make_root(root);
635 if (!s->s_root)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636 goto bail0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637
638 /*
639 * find the root directory's . pointer & finish filling in the inode
640 */
641
642 root_dno = hpfs_fnode_dno(s, sbi->sb_root);
643 if (root_dno)
644 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
645 if (!de)
646 hpfs_error(s, "unable to find root dir");
647 else {
Mikulas Patocka0b697602011-05-08 20:44:26 +0200648 root->i_atime.tv_sec = local_to_gmt(s, le32_to_cpu(de->read_date));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649 root->i_atime.tv_nsec = 0;
Mikulas Patocka0b697602011-05-08 20:44:26 +0200650 root->i_mtime.tv_sec = local_to_gmt(s, le32_to_cpu(de->write_date));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651 root->i_mtime.tv_nsec = 0;
Mikulas Patocka0b697602011-05-08 20:44:26 +0200652 root->i_ctime.tv_sec = local_to_gmt(s, le32_to_cpu(de->creation_date));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653 root->i_ctime.tv_nsec = 0;
Al Virode5e2b32012-04-13 01:24:37 -0400654 hpfs_i(root)->i_ea_size = le32_to_cpu(de->ea_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700655 hpfs_i(root)->i_parent_dir = root->i_ino;
656 if (root->i_size == -1)
657 root->i_size = 2048;
658 if (root->i_blocks == -1)
659 root->i_blocks = 5;
660 hpfs_brelse4(&qbh);
661 }
Mikulas Patocka7dd29d82011-05-08 20:42:54 +0200662 hpfs_unlock(s);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663 return 0;
664
665bail4: brelse(bh2);
666bail3: brelse(bh1);
667bail2: brelse(bh0);
668bail1:
669bail0:
Mikulas Patocka7dd29d82011-05-08 20:42:54 +0200670 hpfs_unlock(s);
Jesper Juhlf99d49a2005-11-07 01:01:34 -0800671 kfree(sbi->sb_bmp_dir);
672 kfree(sbi->sb_cp_table);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700673 s->s_fs_info = NULL;
674 kfree(sbi);
675 return -EINVAL;
676}
677
Al Viro152a0832010-07-25 00:46:55 +0400678static struct dentry *hpfs_mount(struct file_system_type *fs_type,
679 int flags, const char *dev_name, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680{
Al Viro152a0832010-07-25 00:46:55 +0400681 return mount_bdev(fs_type, flags, dev_name, data, hpfs_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682}
683
684static struct file_system_type hpfs_fs_type = {
685 .owner = THIS_MODULE,
686 .name = "hpfs",
Al Viro152a0832010-07-25 00:46:55 +0400687 .mount = hpfs_mount,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700688 .kill_sb = kill_block_super,
689 .fs_flags = FS_REQUIRES_DEV,
690};
691
692static int __init init_hpfs_fs(void)
693{
694 int err = init_inodecache();
695 if (err)
696 goto out1;
697 err = register_filesystem(&hpfs_fs_type);
698 if (err)
699 goto out;
700 return 0;
701out:
702 destroy_inodecache();
703out1:
704 return err;
705}
706
707static void __exit exit_hpfs_fs(void)
708{
709 unregister_filesystem(&hpfs_fs_type);
710 destroy_inodecache();
711}
712
713module_init(init_hpfs_fs)
714module_exit(exit_hpfs_fs)
715MODULE_LICENSE("GPL");