2 * linux/fs/hpfs/super.c
4 * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
6 * mounting, unmounting, error handling
10 #include <linux/module.h>
11 #include <linux/parser.h>
12 #include <linux/init.h>
13 #include <linux/statfs.h>
14 #include <linux/magic.h>
15 #include <linux/sched.h>
16 #include <linux/bitmap.h>
17 #include <linux/slab.h>
19 /* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */
21 static void mark_dirty(struct super_block
*s
, int remount
)
23 if (hpfs_sb(s
)->sb_chkdsk
&& (remount
|| !(s
->s_flags
& MS_RDONLY
))) {
24 struct buffer_head
*bh
;
25 struct hpfs_spare_block
*sb
;
26 if ((sb
= hpfs_map_sector(s
, 17, &bh
, 0))) {
29 mark_buffer_dirty(bh
);
30 sync_dirty_buffer(bh
);
36 /* Mark the filesystem clean (mark it dirty for chkdsk if chkdsk==2 or if there
39 static void unmark_dirty(struct super_block
*s
)
41 struct buffer_head
*bh
;
42 struct hpfs_spare_block
*sb
;
43 if (s
->s_flags
& MS_RDONLY
) return;
44 sync_blockdev(s
->s_bdev
);
45 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
);
49 sync_dirty_buffer(bh
);
54 /* Filesystem error... */
55 static char err_buf
[1024];
57 void hpfs_error(struct super_block
*s
, const char *fmt
, ...)
62 vsnprintf(err_buf
, sizeof(err_buf
), fmt
, args
);
65 printk("HPFS: filesystem error: %s", err_buf
);
66 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");
71 } else if (hpfs_sb(s
)->sb_err
== 1) {
72 if (s
->s_flags
& MS_RDONLY
) printk("; already mounted read-only\n");
74 printk("; remounting read-only\n");
76 s
->s_flags
|= MS_RDONLY
;
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");
81 hpfs_sb(s
)->sb_was_error
= 1;
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.
88 * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories
89 * nested each in other, chkdsk locked up happilly.
92 int hpfs_stop_cycles(struct super_block
*s
, int key
, int *c1
, int *c2
,
95 if (*c2
&& *c1
== key
) {
96 hpfs_error(s
, "cycle detected on key %08x in %s", key
, msg
);
100 if (!((*c2
- 1) & *c2
)) *c1
= key
;
104 static void hpfs_put_super(struct super_block
*s
)
106 struct hpfs_sb_info
*sbi
= hpfs_sb(s
);
112 kfree(sbi
->sb_cp_table
);
113 kfree(sbi
->sb_bmp_dir
);
118 unsigned hpfs_count_one_bitmap(struct super_block
*s
, secno secno
)
120 struct quad_buffer_head qbh
;
124 bits
= hpfs_map_4sectors(s
, secno
, &qbh
, 4);
127 count
= bitmap_weight(bits
, 2048 * BITS_PER_BYTE
);
132 static unsigned count_bitmaps(struct super_block
*s
)
134 unsigned n
, count
, n_bands
;
135 n_bands
= (hpfs_sb(s
)->sb_fs_size
+ 0x3fff) >> 14;
137 for (n
= 0; n
< n_bands
; n
++)
138 count
+= hpfs_count_one_bitmap(s
, le32_to_cpu(hpfs_sb(s
)->sb_bmp_dir
[n
]));
142 static int hpfs_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
144 struct super_block
*s
= dentry
->d_sb
;
145 struct hpfs_sb_info
*sbi
= hpfs_sb(s
);
146 u64 id
= huge_encode_dev(s
->s_bdev
->bd_dev
);
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
);
153 buf
->f_type
= s
->s_magic
;
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
;
160 buf
->f_fsid
.val
[0] = (u32
)id
;
161 buf
->f_fsid
.val
[1] = (u32
)(id
>> 32);
162 buf
->f_namelen
= 254;
169 static struct kmem_cache
* hpfs_inode_cachep
;
171 static struct inode
*hpfs_alloc_inode(struct super_block
*sb
)
173 struct hpfs_inode_info
*ei
;
174 ei
= (struct hpfs_inode_info
*)kmem_cache_alloc(hpfs_inode_cachep
, GFP_NOFS
);
177 ei
->vfs_inode
.i_version
= 1;
178 return &ei
->vfs_inode
;
181 static void hpfs_i_callback(struct rcu_head
*head
)
183 struct inode
*inode
= container_of(head
, struct inode
, i_rcu
);
184 kmem_cache_free(hpfs_inode_cachep
, hpfs_i(inode
));
187 static void hpfs_destroy_inode(struct inode
*inode
)
189 call_rcu(&inode
->i_rcu
, hpfs_i_callback
);
192 static void init_once(void *foo
)
194 struct hpfs_inode_info
*ei
= (struct hpfs_inode_info
*) foo
;
196 inode_init_once(&ei
->vfs_inode
);
199 static int init_inodecache(void)
201 hpfs_inode_cachep
= kmem_cache_create("hpfs_inode_cache",
202 sizeof(struct hpfs_inode_info
),
203 0, (SLAB_RECLAIM_ACCOUNT
|
206 if (hpfs_inode_cachep
== NULL
)
211 static void destroy_inodecache(void)
214 * Make sure all delayed rcu free inodes are flushed before we
218 kmem_cache_destroy(hpfs_inode_cachep
);
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.
228 Opt_help
, Opt_uid
, Opt_gid
, Opt_umask
, Opt_case_lower
, Opt_case_asis
,
229 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
,
236 static const match_table_t tokens
= {
240 {Opt_umask
, "umask=%o"},
241 {Opt_case_lower
, "case=lower"},
242 {Opt_case_asis
, "case=asis"},
243 {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"},
259 static int parse_opts(char *opts
, uid_t
*uid
, gid_t
*gid
, umode_t
*umask
,
260 int *lowercase
, int *eas
, int *chk
, int *errs
,
261 int *chkdsk
, int *timeshift
)
269 /*printk("Parsing opts: '%s'\n",opts);*/
271 while ((p
= strsep(&opts
, ",")) != NULL
) {
272 substring_t args
[MAX_OPT_ARGS
];
277 token
= match_token(p
, tokens
, args
);
282 if (match_int(args
, &option
))
287 if (match_int(args
, &option
))
292 if (match_octal(args
, &option
))
305 case Opt_check_normal
:
308 case Opt_check_strict
:
332 case Opt_chkdsk_errors
:
335 case Opt_chkdsk_always
:
341 char *rhs
= args
[0].from
;
344 if (*rhs
== '-') m
= -1;
345 if (*rhs
== '+' || *rhs
== '-') rhs
++;
346 *timeshift
= simple_strtoul(rhs
, &rhs
, 0) * m
;
358 static inline void hpfs_help(void)
361 HPFS filesystem options:\n\
362 help do not mount and display this text\n\
363 uid=xxx set uid of files that don't have uid specified in eas\n\
364 gid=xxx set gid of files that don't have gid specified in eas\n\
365 umask=xxx set mode of files that don't have mode specified in eas\n\
366 case=lower lowercase all files\n\
367 case=asis do not lowercase files (default)\n\
368 check=none no fs checks - kernel may crash on corrupted filesystem\n\
369 check=normal do some checks - it should not crash (default)\n\
370 check=strict do extra time-consuming checks, used for debugging\n\
371 errors=continue continue on errors\n\
372 errors=remount-ro remount read-only if errors found (default)\n\
373 errors=panic panic on errors\n\
374 chkdsk=no do not mark fs for chkdsking even if there were errors\n\
375 chkdsk=errors mark fs dirty if errors found (default)\n\
376 chkdsk=always always mark fs dirty - used for debugging\n\
377 eas=no ignore extended attributes\n\
378 eas=ro read but do not write extended attributes\n\
379 eas=rw r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
380 timeshift=nnn add nnn seconds to file times\n\
384 static int hpfs_remount_fs(struct super_block
*s
, int *flags
, char *data
)
389 int lowercase
, eas
, chk
, errs
, chkdsk
, timeshift
;
391 struct hpfs_sb_info
*sbi
= hpfs_sb(s
);
392 char *new_opts
= kstrdup(data
, GFP_KERNEL
);
394 *flags
|= MS_NOATIME
;
398 uid
= sbi
->sb_uid
; gid
= sbi
->sb_gid
;
399 umask
= 0777 & ~sbi
->sb_mode
;
400 lowercase
= sbi
->sb_lowercase
;
401 eas
= sbi
->sb_eas
; chk
= sbi
->sb_chk
; chkdsk
= sbi
->sb_chkdsk
;
402 errs
= sbi
->sb_err
; timeshift
= sbi
->sb_timeshift
;
404 if (!(o
= parse_opts(data
, &uid
, &gid
, &umask
, &lowercase
,
405 &eas
, &chk
, &errs
, &chkdsk
, ×hift
))) {
406 printk("HPFS: bad mount options.\n");
413 if (timeshift
!= sbi
->sb_timeshift
) {
414 printk("HPFS: timeshift can't be changed using remount.\n");
420 sbi
->sb_uid
= uid
; sbi
->sb_gid
= gid
;
421 sbi
->sb_mode
= 0777 & ~umask
;
422 sbi
->sb_lowercase
= lowercase
;
423 sbi
->sb_eas
= eas
; sbi
->sb_chk
= chk
; sbi
->sb_chkdsk
= chkdsk
;
424 sbi
->sb_err
= errs
; sbi
->sb_timeshift
= timeshift
;
426 if (!(*flags
& MS_RDONLY
)) mark_dirty(s
, 1);
428 replace_mount_options(s
, new_opts
);
441 /* Super operations */
443 static const struct super_operations hpfs_sops
=
445 .alloc_inode
= hpfs_alloc_inode
,
446 .destroy_inode
= hpfs_destroy_inode
,
447 .evict_inode
= hpfs_evict_inode
,
448 .put_super
= hpfs_put_super
,
449 .statfs
= hpfs_statfs
,
450 .remount_fs
= hpfs_remount_fs
,
451 .show_options
= generic_show_options
,
454 static int hpfs_fill_super(struct super_block
*s
, void *options
, int silent
)
456 struct buffer_head
*bh0
, *bh1
, *bh2
;
457 struct hpfs_boot_block
*bootblock
;
458 struct hpfs_super_block
*superblock
;
459 struct hpfs_spare_block
*spareblock
;
460 struct hpfs_sb_info
*sbi
;
466 int lowercase
, eas
, chk
, errs
, chkdsk
, timeshift
;
468 dnode_secno root_dno
;
469 struct hpfs_dirent
*de
= NULL
;
470 struct quad_buffer_head qbh
;
474 save_mount_options(s
, options
);
476 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
482 sbi
->sb_bmp_dir
= NULL
;
483 sbi
->sb_cp_table
= NULL
;
485 mutex_init(&sbi
->hpfs_mutex
);
490 umask
= current_umask();
498 if (!(o
= parse_opts(options
, &uid
, &gid
, &umask
, &lowercase
,
499 &eas
, &chk
, &errs
, &chkdsk
, ×hift
))) {
500 printk("HPFS: bad mount options.\n");
508 /*sbi->sb_mounting = 1;*/
509 sb_set_blocksize(s
, 512);
510 sbi
->sb_fs_size
= -1;
511 if (!(bootblock
= hpfs_map_sector(s
, 0, &bh0
, 0))) goto bail1
;
512 if (!(superblock
= hpfs_map_sector(s
, 16, &bh1
, 1))) goto bail2
;
513 if (!(spareblock
= hpfs_map_sector(s
, 17, &bh2
, 0))) goto bail3
;
516 if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC
517 ||*/ le32_to_cpu(superblock
->magic
) != SB_MAGIC
518 || le32_to_cpu(spareblock
->magic
) != SP_MAGIC
) {
519 if (!silent
) printk("HPFS: Bad magic ... probably not HPFS\n");
524 if (!(s
->s_flags
& MS_RDONLY
) &&
525 superblock
->funcversion
!= 2 && superblock
->funcversion
!= 3) {
526 printk("HPFS: Bad version %d,%d. Mount readonly to go around\n",
527 (int)superblock
->version
, (int)superblock
->funcversion
);
528 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");
532 s
->s_flags
|= MS_NOATIME
;
534 /* Fill superblock stuff */
535 s
->s_magic
= HPFS_SUPER_MAGIC
;
536 s
->s_op
= &hpfs_sops
;
537 s
->s_d_op
= &hpfs_dentry_operations
;
539 sbi
->sb_root
= le32_to_cpu(superblock
->root
);
540 sbi
->sb_fs_size
= le32_to_cpu(superblock
->n_sectors
);
541 sbi
->sb_bitmaps
= le32_to_cpu(superblock
->bitmaps
);
542 sbi
->sb_dirband_start
= le32_to_cpu(superblock
->dir_band_start
);
543 sbi
->sb_dirband_size
= le32_to_cpu(superblock
->n_dir_band
);
544 sbi
->sb_dmap
= le32_to_cpu(superblock
->dir_band_bitmap
);
547 sbi
->sb_mode
= 0777 & ~umask
;
549 sbi
->sb_n_free_dnodes
= -1;
550 sbi
->sb_lowercase
= lowercase
;
553 sbi
->sb_chkdsk
= chkdsk
;
555 sbi
->sb_timeshift
= timeshift
;
556 sbi
->sb_was_error
= 0;
557 sbi
->sb_cp_table
= NULL
;
558 sbi
->sb_c_bitmap
= -1;
559 sbi
->sb_max_fwd_alloc
= 0xffffff;
561 /* Load bitmap directory */
562 if (!(sbi
->sb_bmp_dir
= hpfs_load_bitmap_directory(s
, le32_to_cpu(superblock
->bitmaps
))))
565 /* Check for general fs errors*/
566 if (spareblock
->dirty
&& !spareblock
->old_wrote
) {
568 printk("HPFS: Improperly stopped, not mounted\n");
571 hpfs_error(s
, "improperly stopped");
574 if (!(s
->s_flags
& MS_RDONLY
)) {
575 spareblock
->dirty
= 1;
576 spareblock
->old_wrote
= 0;
577 mark_buffer_dirty(bh2
);
580 if (spareblock
->hotfixes_used
|| spareblock
->n_spares_used
) {
582 printk("HPFS: Hotfixes not supported here, try chkdsk\n");
586 hpfs_error(s
, "hotfixes not supported here, try chkdsk");
587 if (errs
== 0) printk("HPFS: Proceeding, but your filesystem will be probably corrupted by this driver...\n");
588 else printk("HPFS: This driver may read bad files or crash when operating on disk with hotfixes.\n");
590 if (le32_to_cpu(spareblock
->n_dnode_spares
) != le32_to_cpu(spareblock
->n_dnode_spares_free
)) {
592 printk("HPFS: Spare dnodes used, try chkdsk\n");
596 hpfs_error(s
, "warning: spare dnodes used, try chkdsk");
597 if (errs
== 0) printk("HPFS: Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
601 if (le32_to_cpu(superblock
->dir_band_end
) - le32_to_cpu(superblock
->dir_band_start
) + 1 != le32_to_cpu(superblock
->n_dir_band
) ||
602 le32_to_cpu(superblock
->dir_band_end
) < le32_to_cpu(superblock
->dir_band_start
) || le32_to_cpu(superblock
->n_dir_band
) > 0x4000) {
603 hpfs_error(s
, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
604 le32_to_cpu(superblock
->dir_band_start
), le32_to_cpu(superblock
->dir_band_end
), le32_to_cpu(superblock
->n_dir_band
));
607 a
= sbi
->sb_dirband_size
;
608 sbi
->sb_dirband_size
= 0;
609 if (hpfs_chk_sectors(s
, le32_to_cpu(superblock
->dir_band_start
), le32_to_cpu(superblock
->n_dir_band
), "dir_band") ||
610 hpfs_chk_sectors(s
, le32_to_cpu(superblock
->dir_band_bitmap
), 4, "dir_band_bitmap") ||
611 hpfs_chk_sectors(s
, le32_to_cpu(superblock
->bitmaps
), 4, "bitmaps")) {
615 sbi
->sb_dirband_size
= a
;
616 } else printk("HPFS: You really don't want any checks? You are crazy...\n");
618 /* Load code page table */
619 if (le32_to_cpu(spareblock
->n_code_pages
))
620 if (!(sbi
->sb_cp_table
= hpfs_load_code_page(s
, le32_to_cpu(spareblock
->code_page_dir
))))
621 printk("HPFS: Warning: code page support is disabled\n");
627 root
= iget_locked(s
, sbi
->sb_root
);
630 hpfs_init_inode(root
);
631 hpfs_read_inode(root
);
632 unlock_new_inode(root
);
633 s
->s_root
= d_make_root(root
);
638 * find the root directory's . pointer & finish filling in the inode
641 root_dno
= hpfs_fnode_dno(s
, sbi
->sb_root
);
643 de
= map_dirent(root
, root_dno
, "\001\001", 2, NULL
, &qbh
);
645 hpfs_error(s
, "unable to find root dir");
647 root
->i_atime
.tv_sec
= local_to_gmt(s
, le32_to_cpu(de
->read_date
));
648 root
->i_atime
.tv_nsec
= 0;
649 root
->i_mtime
.tv_sec
= local_to_gmt(s
, le32_to_cpu(de
->write_date
));
650 root
->i_mtime
.tv_nsec
= 0;
651 root
->i_ctime
.tv_sec
= local_to_gmt(s
, le32_to_cpu(de
->creation_date
));
652 root
->i_ctime
.tv_nsec
= 0;
653 hpfs_i(root
)->i_ea_size
= le32_to_cpu(de
->ea_size
);
654 hpfs_i(root
)->i_parent_dir
= root
->i_ino
;
655 if (root
->i_size
== -1)
657 if (root
->i_blocks
== -1)
670 kfree(sbi
->sb_bmp_dir
);
671 kfree(sbi
->sb_cp_table
);
677 static struct dentry
*hpfs_mount(struct file_system_type
*fs_type
,
678 int flags
, const char *dev_name
, void *data
)
680 return mount_bdev(fs_type
, flags
, dev_name
, data
, hpfs_fill_super
);
683 static struct file_system_type hpfs_fs_type
= {
684 .owner
= THIS_MODULE
,
687 .kill_sb
= kill_block_super
,
688 .fs_flags
= FS_REQUIRES_DEV
,
691 static int __init
init_hpfs_fs(void)
693 int err
= init_inodecache();
696 err
= register_filesystem(&hpfs_fs_type
);
701 destroy_inodecache();
706 static void __exit
exit_hpfs_fs(void)
708 unregister_filesystem(&hpfs_fs_type
);
709 destroy_inodecache();
712 module_init(init_hpfs_fs
)
713 module_exit(exit_hpfs_fs
)
714 MODULE_LICENSE("GPL");