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
)
23 if (hpfs_sb(s
)->sb_chkdsk
&& !(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
);
35 /* Mark the filesystem clean (mark it dirty for chkdsk if chkdsk==2 or if there
38 static void unmark_dirty(struct super_block
*s
)
40 struct buffer_head
*bh
;
41 struct hpfs_spare_block
*sb
;
42 if (s
->s_flags
& MS_RDONLY
) return;
43 if ((sb
= hpfs_map_sector(s
, 17, &bh
, 0))) {
44 sb
->dirty
= hpfs_sb(s
)->sb_chkdsk
> 1 - hpfs_sb(s
)->sb_was_error
;
45 sb
->old_wrote
= hpfs_sb(s
)->sb_chkdsk
>= 2 && !hpfs_sb(s
)->sb_was_error
;
46 mark_buffer_dirty(bh
);
51 /* Filesystem error... */
52 static char err_buf
[1024];
54 void hpfs_error(struct super_block
*s
, const char *fmt
, ...)
59 vsnprintf(err_buf
, sizeof(err_buf
), fmt
, args
);
62 printk("HPFS: filesystem error: %s", err_buf
);
63 if (!hpfs_sb(s
)->sb_was_error
) {
64 if (hpfs_sb(s
)->sb_err
== 2) {
65 printk("; crashing the system because you wanted it\n");
68 } else if (hpfs_sb(s
)->sb_err
== 1) {
69 if (s
->s_flags
& MS_RDONLY
) printk("; already mounted read-only\n");
71 printk("; remounting read-only\n");
73 s
->s_flags
|= MS_RDONLY
;
75 } else if (s
->s_flags
& MS_RDONLY
) printk("; going on - but anything won't be destroyed because it's read-only\n");
76 else printk("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n");
78 hpfs_sb(s
)->sb_was_error
= 1;
82 * A little trick to detect cycles in many hpfs structures and don't let the
83 * kernel crash on corrupted filesystem. When first called, set c2 to 0.
85 * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories
86 * nested each in other, chkdsk locked up happilly.
89 int hpfs_stop_cycles(struct super_block
*s
, int key
, int *c1
, int *c2
,
92 if (*c2
&& *c1
== key
) {
93 hpfs_error(s
, "cycle detected on key %08x in %s", key
, msg
);
97 if (!((*c2
- 1) & *c2
)) *c1
= key
;
101 static void hpfs_put_super(struct super_block
*s
)
103 struct hpfs_sb_info
*sbi
= hpfs_sb(s
);
109 kfree(sbi
->sb_cp_table
);
110 kfree(sbi
->sb_bmp_dir
);
115 unsigned hpfs_count_one_bitmap(struct super_block
*s
, secno secno
)
117 struct quad_buffer_head qbh
;
121 bits
= hpfs_map_4sectors(s
, secno
, &qbh
, 4);
124 count
= bitmap_weight(bits
, 2048 * BITS_PER_BYTE
);
129 static unsigned count_bitmaps(struct super_block
*s
)
131 unsigned n
, count
, n_bands
;
132 n_bands
= (hpfs_sb(s
)->sb_fs_size
+ 0x3fff) >> 14;
134 for (n
= 0; n
< n_bands
; n
++)
135 count
+= hpfs_count_one_bitmap(s
, hpfs_sb(s
)->sb_bmp_dir
[n
]);
139 static int hpfs_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
141 struct super_block
*s
= dentry
->d_sb
;
142 struct hpfs_sb_info
*sbi
= hpfs_sb(s
);
143 u64 id
= huge_encode_dev(s
->s_bdev
->bd_dev
);
146 /*if (sbi->sb_n_free == -1) {*/
147 sbi
->sb_n_free
= count_bitmaps(s
);
148 sbi
->sb_n_free_dnodes
= hpfs_count_one_bitmap(s
, sbi
->sb_dmap
);
150 buf
->f_type
= s
->s_magic
;
152 buf
->f_blocks
= sbi
->sb_fs_size
;
153 buf
->f_bfree
= sbi
->sb_n_free
;
154 buf
->f_bavail
= sbi
->sb_n_free
;
155 buf
->f_files
= sbi
->sb_dirband_size
/ 4;
156 buf
->f_ffree
= sbi
->sb_n_free_dnodes
;
157 buf
->f_fsid
.val
[0] = (u32
)id
;
158 buf
->f_fsid
.val
[1] = (u32
)(id
>> 32);
159 buf
->f_namelen
= 254;
166 static struct kmem_cache
* hpfs_inode_cachep
;
168 static struct inode
*hpfs_alloc_inode(struct super_block
*sb
)
170 struct hpfs_inode_info
*ei
;
171 ei
= (struct hpfs_inode_info
*)kmem_cache_alloc(hpfs_inode_cachep
, GFP_NOFS
);
174 ei
->vfs_inode
.i_version
= 1;
175 return &ei
->vfs_inode
;
178 static void hpfs_i_callback(struct rcu_head
*head
)
180 struct inode
*inode
= container_of(head
, struct inode
, i_rcu
);
181 INIT_LIST_HEAD(&inode
->i_dentry
);
182 kmem_cache_free(hpfs_inode_cachep
, hpfs_i(inode
));
185 static void hpfs_destroy_inode(struct inode
*inode
)
187 call_rcu(&inode
->i_rcu
, hpfs_i_callback
);
190 static void init_once(void *foo
)
192 struct hpfs_inode_info
*ei
= (struct hpfs_inode_info
*) foo
;
194 inode_init_once(&ei
->vfs_inode
);
197 static int init_inodecache(void)
199 hpfs_inode_cachep
= kmem_cache_create("hpfs_inode_cache",
200 sizeof(struct hpfs_inode_info
),
201 0, (SLAB_RECLAIM_ACCOUNT
|
204 if (hpfs_inode_cachep
== NULL
)
209 static void destroy_inodecache(void)
211 kmem_cache_destroy(hpfs_inode_cachep
);
215 * A tiny parser for option strings, stolen from dosfs.
216 * Stolen again from read-only hpfs.
217 * And updated for table-driven option parsing.
221 Opt_help
, Opt_uid
, Opt_gid
, Opt_umask
, Opt_case_lower
, Opt_case_asis
,
222 Opt_check_none
, Opt_check_normal
, Opt_check_strict
,
223 Opt_err_cont
, Opt_err_ro
, Opt_err_panic
,
224 Opt_eas_no
, Opt_eas_ro
, Opt_eas_rw
,
225 Opt_chkdsk_no
, Opt_chkdsk_errors
, Opt_chkdsk_always
,
226 Opt_timeshift
, Opt_err
,
229 static const match_table_t tokens
= {
233 {Opt_umask
, "umask=%o"},
234 {Opt_case_lower
, "case=lower"},
235 {Opt_case_asis
, "case=asis"},
236 {Opt_check_none
, "check=none"},
237 {Opt_check_normal
, "check=normal"},
238 {Opt_check_strict
, "check=strict"},
239 {Opt_err_cont
, "errors=continue"},
240 {Opt_err_ro
, "errors=remount-ro"},
241 {Opt_err_panic
, "errors=panic"},
242 {Opt_eas_no
, "eas=no"},
243 {Opt_eas_ro
, "eas=ro"},
244 {Opt_eas_rw
, "eas=rw"},
245 {Opt_chkdsk_no
, "chkdsk=no"},
246 {Opt_chkdsk_errors
, "chkdsk=errors"},
247 {Opt_chkdsk_always
, "chkdsk=always"},
248 {Opt_timeshift
, "timeshift=%d"},
252 static int parse_opts(char *opts
, uid_t
*uid
, gid_t
*gid
, umode_t
*umask
,
253 int *lowercase
, int *eas
, int *chk
, int *errs
,
254 int *chkdsk
, int *timeshift
)
262 /*printk("Parsing opts: '%s'\n",opts);*/
264 while ((p
= strsep(&opts
, ",")) != NULL
) {
265 substring_t args
[MAX_OPT_ARGS
];
270 token
= match_token(p
, tokens
, args
);
275 if (match_int(args
, &option
))
280 if (match_int(args
, &option
))
285 if (match_octal(args
, &option
))
298 case Opt_check_normal
:
301 case Opt_check_strict
:
325 case Opt_chkdsk_errors
:
328 case Opt_chkdsk_always
:
334 char *rhs
= args
[0].from
;
337 if (*rhs
== '-') m
= -1;
338 if (*rhs
== '+' || *rhs
== '-') rhs
++;
339 *timeshift
= simple_strtoul(rhs
, &rhs
, 0) * m
;
351 static inline void hpfs_help(void)
354 HPFS filesystem options:\n\
355 help do not mount and display this text\n\
356 uid=xxx set uid of files that don't have uid specified in eas\n\
357 gid=xxx set gid of files that don't have gid specified in eas\n\
358 umask=xxx set mode of files that don't have mode specified in eas\n\
359 case=lower lowercase all files\n\
360 case=asis do not lowercase files (default)\n\
361 check=none no fs checks - kernel may crash on corrupted filesystem\n\
362 check=normal do some checks - it should not crash (default)\n\
363 check=strict do extra time-consuming checks, used for debugging\n\
364 errors=continue continue on errors\n\
365 errors=remount-ro remount read-only if errors found (default)\n\
366 errors=panic panic on errors\n\
367 chkdsk=no do not mark fs for chkdsking even if there were errors\n\
368 chkdsk=errors mark fs dirty if errors found (default)\n\
369 chkdsk=always always mark fs dirty - used for debugging\n\
370 eas=no ignore extended attributes\n\
371 eas=ro read but do not write extended attributes\n\
372 eas=rw r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
373 timeshift=nnn add nnn seconds to file times\n\
377 static int hpfs_remount_fs(struct super_block
*s
, int *flags
, char *data
)
382 int lowercase
, eas
, chk
, errs
, chkdsk
, timeshift
;
384 struct hpfs_sb_info
*sbi
= hpfs_sb(s
);
385 char *new_opts
= kstrdup(data
, GFP_KERNEL
);
387 *flags
|= MS_NOATIME
;
391 uid
= sbi
->sb_uid
; gid
= sbi
->sb_gid
;
392 umask
= 0777 & ~sbi
->sb_mode
;
393 lowercase
= sbi
->sb_lowercase
;
394 eas
= sbi
->sb_eas
; chk
= sbi
->sb_chk
; chkdsk
= sbi
->sb_chkdsk
;
395 errs
= sbi
->sb_err
; timeshift
= sbi
->sb_timeshift
;
397 if (!(o
= parse_opts(data
, &uid
, &gid
, &umask
, &lowercase
,
398 &eas
, &chk
, &errs
, &chkdsk
, ×hift
))) {
399 printk("HPFS: bad mount options.\n");
406 if (timeshift
!= sbi
->sb_timeshift
) {
407 printk("HPFS: timeshift can't be changed using remount.\n");
413 sbi
->sb_uid
= uid
; sbi
->sb_gid
= gid
;
414 sbi
->sb_mode
= 0777 & ~umask
;
415 sbi
->sb_lowercase
= lowercase
;
416 sbi
->sb_eas
= eas
; sbi
->sb_chk
= chk
; sbi
->sb_chkdsk
= chkdsk
;
417 sbi
->sb_err
= errs
; sbi
->sb_timeshift
= timeshift
;
419 if (!(*flags
& MS_RDONLY
)) mark_dirty(s
);
421 replace_mount_options(s
, new_opts
);
434 /* Super operations */
436 static const struct super_operations hpfs_sops
=
438 .alloc_inode
= hpfs_alloc_inode
,
439 .destroy_inode
= hpfs_destroy_inode
,
440 .evict_inode
= hpfs_evict_inode
,
441 .put_super
= hpfs_put_super
,
442 .statfs
= hpfs_statfs
,
443 .remount_fs
= hpfs_remount_fs
,
444 .show_options
= generic_show_options
,
447 static int hpfs_fill_super(struct super_block
*s
, void *options
, int silent
)
449 struct buffer_head
*bh0
, *bh1
, *bh2
;
450 struct hpfs_boot_block
*bootblock
;
451 struct hpfs_super_block
*superblock
;
452 struct hpfs_spare_block
*spareblock
;
453 struct hpfs_sb_info
*sbi
;
459 int lowercase
, eas
, chk
, errs
, chkdsk
, timeshift
;
461 dnode_secno root_dno
;
462 struct hpfs_dirent
*de
= NULL
;
463 struct quad_buffer_head qbh
;
467 save_mount_options(s
, options
);
469 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
475 sbi
->sb_bmp_dir
= NULL
;
476 sbi
->sb_cp_table
= NULL
;
478 mutex_init(&sbi
->hpfs_mutex
);
483 umask
= current_umask();
491 if (!(o
= parse_opts(options
, &uid
, &gid
, &umask
, &lowercase
,
492 &eas
, &chk
, &errs
, &chkdsk
, ×hift
))) {
493 printk("HPFS: bad mount options.\n");
501 /*sbi->sb_mounting = 1;*/
502 sb_set_blocksize(s
, 512);
503 sbi
->sb_fs_size
= -1;
504 if (!(bootblock
= hpfs_map_sector(s
, 0, &bh0
, 0))) goto bail1
;
505 if (!(superblock
= hpfs_map_sector(s
, 16, &bh1
, 1))) goto bail2
;
506 if (!(spareblock
= hpfs_map_sector(s
, 17, &bh2
, 0))) goto bail3
;
509 if (/*bootblock->magic != BB_MAGIC
510 ||*/ superblock
->magic
!= SB_MAGIC
511 || spareblock
->magic
!= SP_MAGIC
) {
512 if (!silent
) printk("HPFS: Bad magic ... probably not HPFS\n");
517 if (!(s
->s_flags
& MS_RDONLY
) &&
518 superblock
->funcversion
!= 2 && superblock
->funcversion
!= 3) {
519 printk("HPFS: Bad version %d,%d. Mount readonly to go around\n",
520 (int)superblock
->version
, (int)superblock
->funcversion
);
521 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");
525 s
->s_flags
|= MS_NOATIME
;
527 /* Fill superblock stuff */
528 s
->s_magic
= HPFS_SUPER_MAGIC
;
529 s
->s_op
= &hpfs_sops
;
530 s
->s_d_op
= &hpfs_dentry_operations
;
532 sbi
->sb_root
= superblock
->root
;
533 sbi
->sb_fs_size
= superblock
->n_sectors
;
534 sbi
->sb_bitmaps
= superblock
->bitmaps
;
535 sbi
->sb_dirband_start
= superblock
->dir_band_start
;
536 sbi
->sb_dirband_size
= superblock
->n_dir_band
;
537 sbi
->sb_dmap
= superblock
->dir_band_bitmap
;
540 sbi
->sb_mode
= 0777 & ~umask
;
542 sbi
->sb_n_free_dnodes
= -1;
543 sbi
->sb_lowercase
= lowercase
;
546 sbi
->sb_chkdsk
= chkdsk
;
548 sbi
->sb_timeshift
= timeshift
;
549 sbi
->sb_was_error
= 0;
550 sbi
->sb_cp_table
= NULL
;
551 sbi
->sb_c_bitmap
= -1;
552 sbi
->sb_max_fwd_alloc
= 0xffffff;
554 /* Load bitmap directory */
555 if (!(sbi
->sb_bmp_dir
= hpfs_load_bitmap_directory(s
, superblock
->bitmaps
)))
558 /* Check for general fs errors*/
559 if (spareblock
->dirty
&& !spareblock
->old_wrote
) {
561 printk("HPFS: Improperly stopped, not mounted\n");
564 hpfs_error(s
, "improperly stopped");
567 if (!(s
->s_flags
& MS_RDONLY
)) {
568 spareblock
->dirty
= 1;
569 spareblock
->old_wrote
= 0;
570 mark_buffer_dirty(bh2
);
573 if (spareblock
->hotfixes_used
|| spareblock
->n_spares_used
) {
575 printk("HPFS: Hotfixes not supported here, try chkdsk\n");
579 hpfs_error(s
, "hotfixes not supported here, try chkdsk");
580 if (errs
== 0) printk("HPFS: Proceeding, but your filesystem will be probably corrupted by this driver...\n");
581 else printk("HPFS: This driver may read bad files or crash when operating on disk with hotfixes.\n");
583 if (spareblock
->n_dnode_spares
!= spareblock
->n_dnode_spares_free
) {
585 printk("HPFS: Spare dnodes used, try chkdsk\n");
589 hpfs_error(s
, "warning: spare dnodes used, try chkdsk");
590 if (errs
== 0) printk("HPFS: Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
594 if (superblock
->dir_band_end
- superblock
->dir_band_start
+ 1 != superblock
->n_dir_band
||
595 superblock
->dir_band_end
< superblock
->dir_band_start
|| superblock
->n_dir_band
> 0x4000) {
596 hpfs_error(s
, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
597 superblock
->dir_band_start
, superblock
->dir_band_end
, superblock
->n_dir_band
);
600 a
= sbi
->sb_dirband_size
;
601 sbi
->sb_dirband_size
= 0;
602 if (hpfs_chk_sectors(s
, superblock
->dir_band_start
, superblock
->n_dir_band
, "dir_band") ||
603 hpfs_chk_sectors(s
, superblock
->dir_band_bitmap
, 4, "dir_band_bitmap") ||
604 hpfs_chk_sectors(s
, superblock
->bitmaps
, 4, "bitmaps")) {
608 sbi
->sb_dirband_size
= a
;
609 } else printk("HPFS: You really don't want any checks? You are crazy...\n");
611 /* Load code page table */
612 if (spareblock
->n_code_pages
)
613 if (!(sbi
->sb_cp_table
= hpfs_load_code_page(s
, spareblock
->code_page_dir
)))
614 printk("HPFS: Warning: code page support is disabled\n");
620 root
= iget_locked(s
, sbi
->sb_root
);
623 hpfs_init_inode(root
);
624 hpfs_read_inode(root
);
625 unlock_new_inode(root
);
626 s
->s_root
= d_alloc_root(root
);
633 * find the root directory's . pointer & finish filling in the inode
636 root_dno
= hpfs_fnode_dno(s
, sbi
->sb_root
);
638 de
= map_dirent(root
, root_dno
, "\001\001", 2, NULL
, &qbh
);
640 hpfs_error(s
, "unable to find root dir");
642 root
->i_atime
.tv_sec
= local_to_gmt(s
, de
->read_date
);
643 root
->i_atime
.tv_nsec
= 0;
644 root
->i_mtime
.tv_sec
= local_to_gmt(s
, de
->write_date
);
645 root
->i_mtime
.tv_nsec
= 0;
646 root
->i_ctime
.tv_sec
= local_to_gmt(s
, de
->creation_date
);
647 root
->i_ctime
.tv_nsec
= 0;
648 hpfs_i(root
)->i_ea_size
= de
->ea_size
;
649 hpfs_i(root
)->i_parent_dir
= root
->i_ino
;
650 if (root
->i_size
== -1)
652 if (root
->i_blocks
== -1)
665 kfree(sbi
->sb_bmp_dir
);
666 kfree(sbi
->sb_cp_table
);
672 static struct dentry
*hpfs_mount(struct file_system_type
*fs_type
,
673 int flags
, const char *dev_name
, void *data
)
675 return mount_bdev(fs_type
, flags
, dev_name
, data
, hpfs_fill_super
);
678 static struct file_system_type hpfs_fs_type
= {
679 .owner
= THIS_MODULE
,
682 .kill_sb
= kill_block_super
,
683 .fs_flags
= FS_REQUIRES_DEV
,
686 static int __init
init_hpfs_fs(void)
688 int err
= init_inodecache();
691 err
= register_filesystem(&hpfs_fs_type
);
696 destroy_inodecache();
701 static void __exit
exit_hpfs_fs(void)
703 unregister_filesystem(&hpfs_fs_type
);
704 destroy_inodecache();
707 module_init(init_hpfs_fs
)
708 module_exit(exit_hpfs_fs
)
709 MODULE_LICENSE("GPL");