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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
Al Viro30687e02013-10-03 12:25:10 -0400104static void free_sbi(struct hpfs_sb_info *sbi)
105{
106 kfree(sbi->sb_cp_table);
107 kfree(sbi->sb_bmp_dir);
108 kfree(sbi);
109}
110
111static void lazy_free_sbi(struct rcu_head *rcu)
112{
113 free_sbi(container_of(rcu, struct hpfs_sb_info, rcu));
114}
115
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116static void hpfs_put_super(struct super_block *s)
117{
Mikulas Patocka7dd29d82011-05-08 20:42:54 +0200118 hpfs_lock(s);
119 unmark_dirty(s);
120 hpfs_unlock(s);
Al Viro30687e02013-10-03 12:25:10 -0400121 call_rcu(&hpfs_sb(s)->rcu, lazy_free_sbi);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122}
123
124unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
125{
126 struct quad_buffer_head qbh;
Akinobu Mitaf4c54fc2009-12-15 16:46:56 -0800127 unsigned long *bits;
128 unsigned count;
129
Mikulas Patocka275f4952013-07-04 19:04:01 +0200130 bits = hpfs_map_4sectors(s, secno, &qbh, 0);
Akinobu Mitaf4c54fc2009-12-15 16:46:56 -0800131 if (!bits)
132 return 0;
133 count = bitmap_weight(bits, 2048 * BITS_PER_BYTE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 hpfs_brelse4(&qbh);
135 return count;
136}
137
138static unsigned count_bitmaps(struct super_block *s)
139{
140 unsigned n, count, n_bands;
141 n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14;
142 count = 0;
Mikulas Patocka275f4952013-07-04 19:04:01 +0200143 for (n = 0; n < COUNT_RD_AHEAD; n++) {
144 hpfs_prefetch_bitmap(s, n);
145 }
146 for (n = 0; n < n_bands; n++) {
147 hpfs_prefetch_bitmap(s, n + COUNT_RD_AHEAD);
Mikulas Patocka0b697602011-05-08 20:44:26 +0200148 count += hpfs_count_one_bitmap(s, le32_to_cpu(hpfs_sb(s)->sb_bmp_dir[n]));
Mikulas Patocka275f4952013-07-04 19:04:01 +0200149 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 return count;
151}
152
David Howells726c3342006-06-23 02:02:58 -0700153static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154{
David Howells726c3342006-06-23 02:02:58 -0700155 struct super_block *s = dentry->d_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 struct hpfs_sb_info *sbi = hpfs_sb(s);
Coly Li604d2952009-04-02 16:59:37 -0700157 u64 id = huge_encode_dev(s->s_bdev->bd_dev);
Arnd Bergmann9a311b92011-01-22 20:26:12 +0100158 hpfs_lock(s);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159
160 /*if (sbi->sb_n_free == -1) {*/
161 sbi->sb_n_free = count_bitmaps(s);
162 sbi->sb_n_free_dnodes = hpfs_count_one_bitmap(s, sbi->sb_dmap);
163 /*}*/
164 buf->f_type = s->s_magic;
165 buf->f_bsize = 512;
166 buf->f_blocks = sbi->sb_fs_size;
167 buf->f_bfree = sbi->sb_n_free;
168 buf->f_bavail = sbi->sb_n_free;
169 buf->f_files = sbi->sb_dirband_size / 4;
170 buf->f_ffree = sbi->sb_n_free_dnodes;
Coly Li604d2952009-04-02 16:59:37 -0700171 buf->f_fsid.val[0] = (u32)id;
172 buf->f_fsid.val[1] = (u32)(id >> 32);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173 buf->f_namelen = 254;
174
Arnd Bergmann9a311b92011-01-22 20:26:12 +0100175 hpfs_unlock(s);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176
177 return 0;
178}
179
Christoph Lametere18b8902006-12-06 20:33:20 -0800180static struct kmem_cache * hpfs_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700181
182static struct inode *hpfs_alloc_inode(struct super_block *sb)
183{
184 struct hpfs_inode_info *ei;
Christoph Lametere6b4f8d2006-12-06 20:33:14 -0800185 ei = (struct hpfs_inode_info *)kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 if (!ei)
187 return NULL;
188 ei->vfs_inode.i_version = 1;
189 return &ei->vfs_inode;
190}
191
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100192static void hpfs_i_callback(struct rcu_head *head)
193{
194 struct inode *inode = container_of(head, struct inode, i_rcu);
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100195 kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
196}
197
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198static void hpfs_destroy_inode(struct inode *inode)
199{
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100200 call_rcu(&inode->i_rcu, hpfs_i_callback);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201}
202
Alexey Dobriyan51cc5062008-07-25 19:45:34 -0700203static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204{
205 struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;
206
Christoph Lametera35afb82007-05-16 22:10:57 -0700207 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208}
Paul Mundt20c2df82007-07-20 10:11:58 +0900209
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210static int init_inodecache(void)
211{
212 hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache",
213 sizeof(struct hpfs_inode_info),
Paul Jacksonfffb60f2006-03-24 03:16:06 -0800214 0, (SLAB_RECLAIM_ACCOUNT|
215 SLAB_MEM_SPREAD),
Paul Mundt20c2df82007-07-20 10:11:58 +0900216 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 if (hpfs_inode_cachep == NULL)
218 return -ENOMEM;
219 return 0;
220}
221
222static void destroy_inodecache(void)
223{
Kirill A. Shutemov8c0a8532012-09-26 11:33:07 +1000224 /*
225 * Make sure all delayed rcu free inodes are flushed before we
226 * destroy cache.
227 */
228 rcu_barrier();
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -0700229 kmem_cache_destroy(hpfs_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230}
231
232/*
233 * A tiny parser for option strings, stolen from dosfs.
234 * Stolen again from read-only hpfs.
235 * And updated for table-driven option parsing.
236 */
237
238enum {
239 Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 Opt_check_none, Opt_check_normal, Opt_check_strict,
241 Opt_err_cont, Opt_err_ro, Opt_err_panic,
242 Opt_eas_no, Opt_eas_ro, Opt_eas_rw,
243 Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always,
244 Opt_timeshift, Opt_err,
245};
246
Steven Whitehousea447c092008-10-13 10:46:57 +0100247static const match_table_t tokens = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 {Opt_help, "help"},
249 {Opt_uid, "uid=%u"},
250 {Opt_gid, "gid=%u"},
251 {Opt_umask, "umask=%o"},
252 {Opt_case_lower, "case=lower"},
253 {Opt_case_asis, "case=asis"},
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 {Opt_check_none, "check=none"},
255 {Opt_check_normal, "check=normal"},
256 {Opt_check_strict, "check=strict"},
257 {Opt_err_cont, "errors=continue"},
258 {Opt_err_ro, "errors=remount-ro"},
259 {Opt_err_panic, "errors=panic"},
260 {Opt_eas_no, "eas=no"},
261 {Opt_eas_ro, "eas=ro"},
262 {Opt_eas_rw, "eas=rw"},
263 {Opt_chkdsk_no, "chkdsk=no"},
264 {Opt_chkdsk_errors, "chkdsk=errors"},
265 {Opt_chkdsk_always, "chkdsk=always"},
266 {Opt_timeshift, "timeshift=%d"},
267 {Opt_err, NULL},
268};
269
Eric W. Biederman0e1a43c2012-02-07 16:27:53 -0800270static int parse_opts(char *opts, kuid_t *uid, kgid_t *gid, umode_t *umask,
Mikulas Patocka0fe105a2011-05-08 20:43:19 +0200271 int *lowercase, int *eas, int *chk, int *errs,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 int *chkdsk, int *timeshift)
273{
274 char *p;
275 int option;
276
277 if (!opts)
278 return 1;
279
280 /*printk("Parsing opts: '%s'\n",opts);*/
281
282 while ((p = strsep(&opts, ",")) != NULL) {
283 substring_t args[MAX_OPT_ARGS];
284 int token;
285 if (!*p)
286 continue;
287
288 token = match_token(p, tokens, args);
289 switch (token) {
290 case Opt_help:
291 return 2;
292 case Opt_uid:
293 if (match_int(args, &option))
294 return 0;
Eric W. Biederman0e1a43c2012-02-07 16:27:53 -0800295 *uid = make_kuid(current_user_ns(), option);
296 if (!uid_valid(*uid))
297 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 break;
299 case Opt_gid:
300 if (match_int(args, &option))
301 return 0;
Eric W. Biederman0e1a43c2012-02-07 16:27:53 -0800302 *gid = make_kgid(current_user_ns(), option);
303 if (!gid_valid(*gid))
304 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 break;
306 case Opt_umask:
307 if (match_octal(args, &option))
308 return 0;
309 *umask = option;
310 break;
311 case Opt_case_lower:
312 *lowercase = 1;
313 break;
314 case Opt_case_asis:
315 *lowercase = 0;
316 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 case Opt_check_none:
318 *chk = 0;
319 break;
320 case Opt_check_normal:
321 *chk = 1;
322 break;
323 case Opt_check_strict:
324 *chk = 2;
325 break;
326 case Opt_err_cont:
327 *errs = 0;
328 break;
329 case Opt_err_ro:
330 *errs = 1;
331 break;
332 case Opt_err_panic:
333 *errs = 2;
334 break;
335 case Opt_eas_no:
336 *eas = 0;
337 break;
338 case Opt_eas_ro:
339 *eas = 1;
340 break;
341 case Opt_eas_rw:
342 *eas = 2;
343 break;
344 case Opt_chkdsk_no:
345 *chkdsk = 0;
346 break;
347 case Opt_chkdsk_errors:
348 *chkdsk = 1;
349 break;
350 case Opt_chkdsk_always:
351 *chkdsk = 2;
352 break;
353 case Opt_timeshift:
354 {
355 int m = 1;
356 char *rhs = args[0].from;
357 if (!rhs || !*rhs)
358 return 0;
359 if (*rhs == '-') m = -1;
360 if (*rhs == '+' || *rhs == '-') rhs++;
361 *timeshift = simple_strtoul(rhs, &rhs, 0) * m;
362 if (*rhs)
363 return 0;
364 break;
365 }
366 default:
367 return 0;
368 }
369 }
370 return 1;
371}
372
373static inline void hpfs_help(void)
374{
375 printk("\n\
376HPFS filesystem options:\n\
377 help do not mount and display this text\n\
378 uid=xxx set uid of files that don't have uid specified in eas\n\
379 gid=xxx set gid of files that don't have gid specified in eas\n\
380 umask=xxx set mode of files that don't have mode specified in eas\n\
381 case=lower lowercase all files\n\
382 case=asis do not lowercase files (default)\n\
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 check=none no fs checks - kernel may crash on corrupted filesystem\n\
384 check=normal do some checks - it should not crash (default)\n\
385 check=strict do extra time-consuming checks, used for debugging\n\
386 errors=continue continue on errors\n\
387 errors=remount-ro remount read-only if errors found (default)\n\
388 errors=panic panic on errors\n\
389 chkdsk=no do not mark fs for chkdsking even if there were errors\n\
390 chkdsk=errors mark fs dirty if errors found (default)\n\
391 chkdsk=always always mark fs dirty - used for debugging\n\
392 eas=no ignore extended attributes\n\
393 eas=ro read but do not write extended attributes\n\
394 eas=rw r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
395 timeshift=nnn add nnn seconds to file times\n\
396\n");
397}
398
399static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
400{
Eric W. Biederman0e1a43c2012-02-07 16:27:53 -0800401 kuid_t uid;
402 kgid_t gid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403 umode_t umask;
Mikulas Patocka0fe105a2011-05-08 20:43:19 +0200404 int lowercase, eas, chk, errs, chkdsk, timeshift;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405 int o;
406 struct hpfs_sb_info *sbi = hpfs_sb(s);
Miklos Szeredi6d9c1fd2008-02-08 04:21:44 -0800407 char *new_opts = kstrdup(data, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408
409 *flags |= MS_NOATIME;
410
Arnd Bergmann9a311b92011-01-22 20:26:12 +0100411 hpfs_lock(s);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 uid = sbi->sb_uid; gid = sbi->sb_gid;
413 umask = 0777 & ~sbi->sb_mode;
Mikulas Patocka0fe105a2011-05-08 20:43:19 +0200414 lowercase = sbi->sb_lowercase;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk;
416 errs = sbi->sb_err; timeshift = sbi->sb_timeshift;
417
Mikulas Patocka0fe105a2011-05-08 20:43:19 +0200418 if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700419 &eas, &chk, &errs, &chkdsk, &timeshift))) {
420 printk("HPFS: bad mount options.\n");
Miklos Szeredi6d9c1fd2008-02-08 04:21:44 -0800421 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700422 }
423 if (o == 2) {
424 hpfs_help();
Miklos Szeredi6d9c1fd2008-02-08 04:21:44 -0800425 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426 }
427 if (timeshift != sbi->sb_timeshift) {
428 printk("HPFS: timeshift can't be changed using remount.\n");
Miklos Szeredi6d9c1fd2008-02-08 04:21:44 -0800429 goto out_err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 }
431
432 unmark_dirty(s);
433
434 sbi->sb_uid = uid; sbi->sb_gid = gid;
435 sbi->sb_mode = 0777 & ~umask;
Mikulas Patocka0fe105a2011-05-08 20:43:19 +0200436 sbi->sb_lowercase = lowercase;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437 sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk;
438 sbi->sb_err = errs; sbi->sb_timeshift = timeshift;
439
Mikulas Patockadab4c82a2011-05-08 20:44:08 +0200440 if (!(*flags & MS_RDONLY)) mark_dirty(s, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441
Al Viro2a32ceb2009-05-08 16:05:57 -0400442 replace_mount_options(s, new_opts);
Miklos Szeredi6d9c1fd2008-02-08 04:21:44 -0800443
Arnd Bergmann9a311b92011-01-22 20:26:12 +0100444 hpfs_unlock(s);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 return 0;
Miklos Szeredi6d9c1fd2008-02-08 04:21:44 -0800446
447out_err:
Arnd Bergmann9a311b92011-01-22 20:26:12 +0100448 hpfs_unlock(s);
Miklos Szeredi6d9c1fd2008-02-08 04:21:44 -0800449 kfree(new_opts);
450 return -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451}
452
453/* Super operations */
454
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800455static const struct super_operations hpfs_sops =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456{
457 .alloc_inode = hpfs_alloc_inode,
458 .destroy_inode = hpfs_destroy_inode,
Al Viroea544002010-06-07 00:18:40 -0400459 .evict_inode = hpfs_evict_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700460 .put_super = hpfs_put_super,
461 .statfs = hpfs_statfs,
462 .remount_fs = hpfs_remount_fs,
Miklos Szeredi6d9c1fd2008-02-08 04:21:44 -0800463 .show_options = generic_show_options,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464};
465
466static int hpfs_fill_super(struct super_block *s, void *options, int silent)
467{
468 struct buffer_head *bh0, *bh1, *bh2;
469 struct hpfs_boot_block *bootblock;
470 struct hpfs_super_block *superblock;
471 struct hpfs_spare_block *spareblock;
472 struct hpfs_sb_info *sbi;
473 struct inode *root;
474
Eric W. Biederman0e1a43c2012-02-07 16:27:53 -0800475 kuid_t uid;
476 kgid_t gid;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700477 umode_t umask;
Mikulas Patocka0fe105a2011-05-08 20:43:19 +0200478 int lowercase, eas, chk, errs, chkdsk, timeshift;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479
480 dnode_secno root_dno;
481 struct hpfs_dirent *de = NULL;
482 struct quad_buffer_head qbh;
483
484 int o;
485
Miklos Szeredi6d9c1fd2008-02-08 04:21:44 -0800486 save_mount_options(s, options);
487
Panagiotis Issarisf8314dc2006-09-27 01:49:37 -0700488 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
Jan Blunckdb719222010-08-15 22:51:10 +0200489 if (!sbi) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490 return -ENOMEM;
Jan Blunckdb719222010-08-15 22:51:10 +0200491 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700492 s->s_fs_info = sbi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493
Mikulas Patocka7dd29d82011-05-08 20:42:54 +0200494 mutex_init(&sbi->hpfs_mutex);
495 hpfs_lock(s);
496
David Howellsde395b82008-11-14 10:38:55 +1100497 uid = current_uid();
498 gid = current_gid();
Al Viroce3b0f82009-03-29 19:08:22 -0400499 umask = current_umask();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500 lowercase = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 eas = 2;
502 chk = 1;
503 errs = 1;
504 chkdsk = 1;
505 timeshift = 0;
506
Mikulas Patocka0fe105a2011-05-08 20:43:19 +0200507 if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508 &eas, &chk, &errs, &chkdsk, &timeshift))) {
509 printk("HPFS: bad mount options.\n");
510 goto bail0;
511 }
512 if (o==2) {
513 hpfs_help();
514 goto bail0;
515 }
516
517 /*sbi->sb_mounting = 1;*/
518 sb_set_blocksize(s, 512);
519 sbi->sb_fs_size = -1;
520 if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
521 if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
522 if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;
523
524 /* Check magics */
Mikulas Patocka0b697602011-05-08 20:44:26 +0200525 if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC
526 ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC
527 || le32_to_cpu(spareblock->magic) != SP_MAGIC) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 if (!silent) printk("HPFS: Bad magic ... probably not HPFS\n");
529 goto bail4;
530 }
531
532 /* Check version */
533 if (!(s->s_flags & MS_RDONLY) &&
534 superblock->funcversion != 2 && superblock->funcversion != 3) {
535 printk("HPFS: Bad version %d,%d. Mount readonly to go around\n",
536 (int)superblock->version, (int)superblock->funcversion);
537 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");
538 goto bail4;
539 }
540
541 s->s_flags |= MS_NOATIME;
542
543 /* Fill superblock stuff */
544 s->s_magic = HPFS_SUPER_MAGIC;
545 s->s_op = &hpfs_sops;
Al Viro43d344d2011-01-12 16:12:05 -0500546 s->s_d_op = &hpfs_dentry_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547
Mikulas Patocka0b697602011-05-08 20:44:26 +0200548 sbi->sb_root = le32_to_cpu(superblock->root);
549 sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors);
550 sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps);
551 sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start);
552 sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band);
553 sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700554 sbi->sb_uid = uid;
555 sbi->sb_gid = gid;
556 sbi->sb_mode = 0777 & ~umask;
557 sbi->sb_n_free = -1;
558 sbi->sb_n_free_dnodes = -1;
559 sbi->sb_lowercase = lowercase;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560 sbi->sb_eas = eas;
561 sbi->sb_chk = chk;
562 sbi->sb_chkdsk = chkdsk;
563 sbi->sb_err = errs;
564 sbi->sb_timeshift = timeshift;
565 sbi->sb_was_error = 0;
566 sbi->sb_cp_table = NULL;
567 sbi->sb_c_bitmap = -1;
568 sbi->sb_max_fwd_alloc = 0xffffff;
Mikulas Patocka3ebacb02013-07-04 18:42:29 +0200569
570 if (sbi->sb_fs_size >= 0x80000000) {
571 hpfs_error(s, "invalid size in superblock: %08x",
572 (unsigned)sbi->sb_fs_size);
573 goto bail4;
574 }
575
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 /* Load bitmap directory */
Mikulas Patocka0b697602011-05-08 20:44:26 +0200577 if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps))))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578 goto bail4;
579
580 /* Check for general fs errors*/
581 if (spareblock->dirty && !spareblock->old_wrote) {
582 if (errs == 2) {
583 printk("HPFS: Improperly stopped, not mounted\n");
584 goto bail4;
585 }
586 hpfs_error(s, "improperly stopped");
587 }
588
589 if (!(s->s_flags & MS_RDONLY)) {
590 spareblock->dirty = 1;
591 spareblock->old_wrote = 0;
592 mark_buffer_dirty(bh2);
593 }
594
Al Viro28fe3c12012-04-17 16:41:13 -0400595 if (spareblock->hotfixes_used || spareblock->n_spares_used) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596 if (errs >= 2) {
597 printk("HPFS: Hotfixes not supported here, try chkdsk\n");
Mikulas Patockadab4c82a2011-05-08 20:44:08 +0200598 mark_dirty(s, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599 goto bail4;
600 }
601 hpfs_error(s, "hotfixes not supported here, try chkdsk");
602 if (errs == 0) printk("HPFS: Proceeding, but your filesystem will be probably corrupted by this driver...\n");
603 else printk("HPFS: This driver may read bad files or crash when operating on disk with hotfixes.\n");
604 }
Mikulas Patocka0b697602011-05-08 20:44:26 +0200605 if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 if (errs >= 2) {
607 printk("HPFS: Spare dnodes used, try chkdsk\n");
Mikulas Patockadab4c82a2011-05-08 20:44:08 +0200608 mark_dirty(s, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 goto bail4;
610 }
611 hpfs_error(s, "warning: spare dnodes used, try chkdsk");
612 if (errs == 0) printk("HPFS: Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
613 }
614 if (chk) {
615 unsigned a;
Mikulas Patocka0b697602011-05-08 20:44:26 +0200616 if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) ||
617 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 -0700618 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 +0200619 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 -0700620 goto bail4;
621 }
622 a = sbi->sb_dirband_size;
623 sbi->sb_dirband_size = 0;
Mikulas Patocka0b697602011-05-08 20:44:26 +0200624 if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") ||
625 hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") ||
626 hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) {
Mikulas Patockadab4c82a2011-05-08 20:44:08 +0200627 mark_dirty(s, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628 goto bail4;
629 }
630 sbi->sb_dirband_size = a;
631 } else printk("HPFS: You really don't want any checks? You are crazy...\n");
632
633 /* Load code page table */
Mikulas Patocka0b697602011-05-08 20:44:26 +0200634 if (le32_to_cpu(spareblock->n_code_pages))
635 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir))))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700636 printk("HPFS: Warning: code page support is disabled\n");
637
638 brelse(bh2);
639 brelse(bh1);
640 brelse(bh0);
641
642 root = iget_locked(s, sbi->sb_root);
643 if (!root)
644 goto bail0;
645 hpfs_init_inode(root);
646 hpfs_read_inode(root);
647 unlock_new_inode(root);
Al Viro48fde702012-01-08 22:15:13 -0500648 s->s_root = d_make_root(root);
649 if (!s->s_root)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650 goto bail0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651
652 /*
653 * find the root directory's . pointer & finish filling in the inode
654 */
655
656 root_dno = hpfs_fnode_dno(s, sbi->sb_root);
657 if (root_dno)
658 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
659 if (!de)
660 hpfs_error(s, "unable to find root dir");
661 else {
Mikulas Patocka0b697602011-05-08 20:44:26 +0200662 root->i_atime.tv_sec = local_to_gmt(s, le32_to_cpu(de->read_date));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663 root->i_atime.tv_nsec = 0;
Mikulas Patocka0b697602011-05-08 20:44:26 +0200664 root->i_mtime.tv_sec = local_to_gmt(s, le32_to_cpu(de->write_date));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700665 root->i_mtime.tv_nsec = 0;
Mikulas Patocka0b697602011-05-08 20:44:26 +0200666 root->i_ctime.tv_sec = local_to_gmt(s, le32_to_cpu(de->creation_date));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667 root->i_ctime.tv_nsec = 0;
Al Virode5e2b32012-04-13 01:24:37 -0400668 hpfs_i(root)->i_ea_size = le32_to_cpu(de->ea_size);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669 hpfs_i(root)->i_parent_dir = root->i_ino;
670 if (root->i_size == -1)
671 root->i_size = 2048;
672 if (root->i_blocks == -1)
673 root->i_blocks = 5;
674 hpfs_brelse4(&qbh);
675 }
Mikulas Patocka7dd29d82011-05-08 20:42:54 +0200676 hpfs_unlock(s);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677 return 0;
678
679bail4: brelse(bh2);
680bail3: brelse(bh1);
681bail2: brelse(bh0);
682bail1:
683bail0:
Mikulas Patocka7dd29d82011-05-08 20:42:54 +0200684 hpfs_unlock(s);
Al Viro30687e02013-10-03 12:25:10 -0400685 free_sbi(sbi);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700686 return -EINVAL;
687}
688
Al Viro152a0832010-07-25 00:46:55 +0400689static struct dentry *hpfs_mount(struct file_system_type *fs_type,
690 int flags, const char *dev_name, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700691{
Al Viro152a0832010-07-25 00:46:55 +0400692 return mount_bdev(fs_type, flags, dev_name, data, hpfs_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693}
694
695static struct file_system_type hpfs_fs_type = {
696 .owner = THIS_MODULE,
697 .name = "hpfs",
Al Viro152a0832010-07-25 00:46:55 +0400698 .mount = hpfs_mount,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700699 .kill_sb = kill_block_super,
700 .fs_flags = FS_REQUIRES_DEV,
701};
Eric W. Biederman3e64fe52013-03-11 07:05:42 -0700702MODULE_ALIAS_FS("hpfs");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700703
704static int __init init_hpfs_fs(void)
705{
706 int err = init_inodecache();
707 if (err)
708 goto out1;
709 err = register_filesystem(&hpfs_fs_type);
710 if (err)
711 goto out;
712 return 0;
713out:
714 destroy_inodecache();
715out1:
716 return err;
717}
718
719static void __exit exit_hpfs_fs(void)
720{
721 unregister_filesystem(&hpfs_fs_type);
722 destroy_inodecache();
723}
724
725module_init(init_hpfs_fs)
726module_exit(exit_hpfs_fs)
727MODULE_LICENSE("GPL");