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 free_sbi(struct hpfs_sb_info
*sbi
)
106 kfree(sbi
->sb_cp_table
);
107 kfree(sbi
->sb_bmp_dir
);
111 static void lazy_free_sbi(struct rcu_head
*rcu
)
113 free_sbi(container_of(rcu
, struct hpfs_sb_info
, rcu
));
116 static void hpfs_put_super(struct super_block
*s
)
121 call_rcu(&hpfs_sb(s
)->rcu
, lazy_free_sbi
);
124 static unsigned hpfs_count_one_bitmap(struct super_block
*s
, secno secno
)
126 struct quad_buffer_head qbh
;
130 bits
= hpfs_map_4sectors(s
, secno
, &qbh
, 0);
133 count
= bitmap_weight(bits
, 2048 * BITS_PER_BYTE
);
138 static unsigned count_bitmaps(struct super_block
*s
)
140 unsigned n
, count
, n_bands
;
141 n_bands
= (hpfs_sb(s
)->sb_fs_size
+ 0x3fff) >> 14;
143 for (n
= 0; n
< COUNT_RD_AHEAD
; n
++) {
144 hpfs_prefetch_bitmap(s
, n
);
146 for (n
= 0; n
< n_bands
; n
++) {
148 hpfs_prefetch_bitmap(s
, n
+ COUNT_RD_AHEAD
);
149 c
= hpfs_count_one_bitmap(s
, le32_to_cpu(hpfs_sb(s
)->sb_bmp_dir
[n
]));
150 if (c
!= (unsigned)-1)
156 unsigned hpfs_get_free_dnodes(struct super_block
*s
)
158 struct hpfs_sb_info
*sbi
= hpfs_sb(s
);
159 if (sbi
->sb_n_free_dnodes
== (unsigned)-1) {
160 unsigned c
= hpfs_count_one_bitmap(s
, sbi
->sb_dmap
);
161 if (c
== (unsigned)-1)
163 sbi
->sb_n_free_dnodes
= c
;
165 return sbi
->sb_n_free_dnodes
;
168 static int hpfs_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
170 struct super_block
*s
= dentry
->d_sb
;
171 struct hpfs_sb_info
*sbi
= hpfs_sb(s
);
172 u64 id
= huge_encode_dev(s
->s_bdev
->bd_dev
);
176 if (sbi
->sb_n_free
== (unsigned)-1)
177 sbi
->sb_n_free
= count_bitmaps(s
);
179 buf
->f_type
= s
->s_magic
;
181 buf
->f_blocks
= sbi
->sb_fs_size
;
182 buf
->f_bfree
= sbi
->sb_n_free
;
183 buf
->f_bavail
= sbi
->sb_n_free
;
184 buf
->f_files
= sbi
->sb_dirband_size
/ 4;
185 buf
->f_ffree
= hpfs_get_free_dnodes(s
);
186 buf
->f_fsid
.val
[0] = (u32
)id
;
187 buf
->f_fsid
.val
[1] = (u32
)(id
>> 32);
188 buf
->f_namelen
= 254;
195 static struct kmem_cache
* hpfs_inode_cachep
;
197 static struct inode
*hpfs_alloc_inode(struct super_block
*sb
)
199 struct hpfs_inode_info
*ei
;
200 ei
= (struct hpfs_inode_info
*)kmem_cache_alloc(hpfs_inode_cachep
, GFP_NOFS
);
203 ei
->vfs_inode
.i_version
= 1;
204 return &ei
->vfs_inode
;
207 static void hpfs_i_callback(struct rcu_head
*head
)
209 struct inode
*inode
= container_of(head
, struct inode
, i_rcu
);
210 kmem_cache_free(hpfs_inode_cachep
, hpfs_i(inode
));
213 static void hpfs_destroy_inode(struct inode
*inode
)
215 call_rcu(&inode
->i_rcu
, hpfs_i_callback
);
218 static void init_once(void *foo
)
220 struct hpfs_inode_info
*ei
= (struct hpfs_inode_info
*) foo
;
222 inode_init_once(&ei
->vfs_inode
);
225 static int init_inodecache(void)
227 hpfs_inode_cachep
= kmem_cache_create("hpfs_inode_cache",
228 sizeof(struct hpfs_inode_info
),
229 0, (SLAB_RECLAIM_ACCOUNT
|
232 if (hpfs_inode_cachep
== NULL
)
237 static void destroy_inodecache(void)
240 * Make sure all delayed rcu free inodes are flushed before we
244 kmem_cache_destroy(hpfs_inode_cachep
);
248 * A tiny parser for option strings, stolen from dosfs.
249 * Stolen again from read-only hpfs.
250 * And updated for table-driven option parsing.
254 Opt_help
, Opt_uid
, Opt_gid
, Opt_umask
, Opt_case_lower
, Opt_case_asis
,
255 Opt_check_none
, Opt_check_normal
, Opt_check_strict
,
256 Opt_err_cont
, Opt_err_ro
, Opt_err_panic
,
257 Opt_eas_no
, Opt_eas_ro
, Opt_eas_rw
,
258 Opt_chkdsk_no
, Opt_chkdsk_errors
, Opt_chkdsk_always
,
259 Opt_timeshift
, Opt_err
,
262 static const match_table_t tokens
= {
266 {Opt_umask
, "umask=%o"},
267 {Opt_case_lower
, "case=lower"},
268 {Opt_case_asis
, "case=asis"},
269 {Opt_check_none
, "check=none"},
270 {Opt_check_normal
, "check=normal"},
271 {Opt_check_strict
, "check=strict"},
272 {Opt_err_cont
, "errors=continue"},
273 {Opt_err_ro
, "errors=remount-ro"},
274 {Opt_err_panic
, "errors=panic"},
275 {Opt_eas_no
, "eas=no"},
276 {Opt_eas_ro
, "eas=ro"},
277 {Opt_eas_rw
, "eas=rw"},
278 {Opt_chkdsk_no
, "chkdsk=no"},
279 {Opt_chkdsk_errors
, "chkdsk=errors"},
280 {Opt_chkdsk_always
, "chkdsk=always"},
281 {Opt_timeshift
, "timeshift=%d"},
285 static int parse_opts(char *opts
, kuid_t
*uid
, kgid_t
*gid
, umode_t
*umask
,
286 int *lowercase
, int *eas
, int *chk
, int *errs
,
287 int *chkdsk
, int *timeshift
)
295 /*printk("Parsing opts: '%s'\n",opts);*/
297 while ((p
= strsep(&opts
, ",")) != NULL
) {
298 substring_t args
[MAX_OPT_ARGS
];
303 token
= match_token(p
, tokens
, args
);
308 if (match_int(args
, &option
))
310 *uid
= make_kuid(current_user_ns(), option
);
311 if (!uid_valid(*uid
))
315 if (match_int(args
, &option
))
317 *gid
= make_kgid(current_user_ns(), option
);
318 if (!gid_valid(*gid
))
322 if (match_octal(args
, &option
))
335 case Opt_check_normal
:
338 case Opt_check_strict
:
362 case Opt_chkdsk_errors
:
365 case Opt_chkdsk_always
:
371 char *rhs
= args
[0].from
;
374 if (*rhs
== '-') m
= -1;
375 if (*rhs
== '+' || *rhs
== '-') rhs
++;
376 *timeshift
= simple_strtoul(rhs
, &rhs
, 0) * m
;
388 static inline void hpfs_help(void)
391 HPFS filesystem options:\n\
392 help do not mount and display this text\n\
393 uid=xxx set uid of files that don't have uid specified in eas\n\
394 gid=xxx set gid of files that don't have gid specified in eas\n\
395 umask=xxx set mode of files that don't have mode specified in eas\n\
396 case=lower lowercase all files\n\
397 case=asis do not lowercase files (default)\n\
398 check=none no fs checks - kernel may crash on corrupted filesystem\n\
399 check=normal do some checks - it should not crash (default)\n\
400 check=strict do extra time-consuming checks, used for debugging\n\
401 errors=continue continue on errors\n\
402 errors=remount-ro remount read-only if errors found (default)\n\
403 errors=panic panic on errors\n\
404 chkdsk=no do not mark fs for chkdsking even if there were errors\n\
405 chkdsk=errors mark fs dirty if errors found (default)\n\
406 chkdsk=always always mark fs dirty - used for debugging\n\
407 eas=no ignore extended attributes\n\
408 eas=ro read but do not write extended attributes\n\
409 eas=rw r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
410 timeshift=nnn add nnn seconds to file times\n\
414 static int hpfs_remount_fs(struct super_block
*s
, int *flags
, char *data
)
419 int lowercase
, eas
, chk
, errs
, chkdsk
, timeshift
;
421 struct hpfs_sb_info
*sbi
= hpfs_sb(s
);
422 char *new_opts
= kstrdup(data
, GFP_KERNEL
);
426 *flags
|= MS_NOATIME
;
429 uid
= sbi
->sb_uid
; gid
= sbi
->sb_gid
;
430 umask
= 0777 & ~sbi
->sb_mode
;
431 lowercase
= sbi
->sb_lowercase
;
432 eas
= sbi
->sb_eas
; chk
= sbi
->sb_chk
; chkdsk
= sbi
->sb_chkdsk
;
433 errs
= sbi
->sb_err
; timeshift
= sbi
->sb_timeshift
;
435 if (!(o
= parse_opts(data
, &uid
, &gid
, &umask
, &lowercase
,
436 &eas
, &chk
, &errs
, &chkdsk
, ×hift
))) {
437 printk("HPFS: bad mount options.\n");
444 if (timeshift
!= sbi
->sb_timeshift
) {
445 printk("HPFS: timeshift can't be changed using remount.\n");
451 sbi
->sb_uid
= uid
; sbi
->sb_gid
= gid
;
452 sbi
->sb_mode
= 0777 & ~umask
;
453 sbi
->sb_lowercase
= lowercase
;
454 sbi
->sb_eas
= eas
; sbi
->sb_chk
= chk
; sbi
->sb_chkdsk
= chkdsk
;
455 sbi
->sb_err
= errs
; sbi
->sb_timeshift
= timeshift
;
457 if (!(*flags
& MS_RDONLY
)) mark_dirty(s
, 1);
459 replace_mount_options(s
, new_opts
);
470 /* Super operations */
472 static const struct super_operations hpfs_sops
=
474 .alloc_inode
= hpfs_alloc_inode
,
475 .destroy_inode
= hpfs_destroy_inode
,
476 .evict_inode
= hpfs_evict_inode
,
477 .put_super
= hpfs_put_super
,
478 .statfs
= hpfs_statfs
,
479 .remount_fs
= hpfs_remount_fs
,
480 .show_options
= generic_show_options
,
483 static int hpfs_fill_super(struct super_block
*s
, void *options
, int silent
)
485 struct buffer_head
*bh0
, *bh1
, *bh2
;
486 struct hpfs_boot_block
*bootblock
;
487 struct hpfs_super_block
*superblock
;
488 struct hpfs_spare_block
*spareblock
;
489 struct hpfs_sb_info
*sbi
;
495 int lowercase
, eas
, chk
, errs
, chkdsk
, timeshift
;
497 dnode_secno root_dno
;
498 struct hpfs_dirent
*de
= NULL
;
499 struct quad_buffer_head qbh
;
503 save_mount_options(s
, options
);
505 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
511 mutex_init(&sbi
->hpfs_mutex
);
516 umask
= current_umask();
524 if (!(o
= parse_opts(options
, &uid
, &gid
, &umask
, &lowercase
,
525 &eas
, &chk
, &errs
, &chkdsk
, ×hift
))) {
526 printk("HPFS: bad mount options.\n");
534 /*sbi->sb_mounting = 1;*/
535 sb_set_blocksize(s
, 512);
536 sbi
->sb_fs_size
= -1;
537 if (!(bootblock
= hpfs_map_sector(s
, 0, &bh0
, 0))) goto bail1
;
538 if (!(superblock
= hpfs_map_sector(s
, 16, &bh1
, 1))) goto bail2
;
539 if (!(spareblock
= hpfs_map_sector(s
, 17, &bh2
, 0))) goto bail3
;
542 if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC
543 ||*/ le32_to_cpu(superblock
->magic
) != SB_MAGIC
544 || le32_to_cpu(spareblock
->magic
) != SP_MAGIC
) {
545 if (!silent
) printk("HPFS: Bad magic ... probably not HPFS\n");
550 if (!(s
->s_flags
& MS_RDONLY
) &&
551 superblock
->funcversion
!= 2 && superblock
->funcversion
!= 3) {
552 printk("HPFS: Bad version %d,%d. Mount readonly to go around\n",
553 (int)superblock
->version
, (int)superblock
->funcversion
);
554 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");
558 s
->s_flags
|= MS_NOATIME
;
560 /* Fill superblock stuff */
561 s
->s_magic
= HPFS_SUPER_MAGIC
;
562 s
->s_op
= &hpfs_sops
;
563 s
->s_d_op
= &hpfs_dentry_operations
;
565 sbi
->sb_root
= le32_to_cpu(superblock
->root
);
566 sbi
->sb_fs_size
= le32_to_cpu(superblock
->n_sectors
);
567 sbi
->sb_bitmaps
= le32_to_cpu(superblock
->bitmaps
);
568 sbi
->sb_dirband_start
= le32_to_cpu(superblock
->dir_band_start
);
569 sbi
->sb_dirband_size
= le32_to_cpu(superblock
->n_dir_band
);
570 sbi
->sb_dmap
= le32_to_cpu(superblock
->dir_band_bitmap
);
573 sbi
->sb_mode
= 0777 & ~umask
;
575 sbi
->sb_n_free_dnodes
= -1;
576 sbi
->sb_lowercase
= lowercase
;
579 sbi
->sb_chkdsk
= chkdsk
;
581 sbi
->sb_timeshift
= timeshift
;
582 sbi
->sb_was_error
= 0;
583 sbi
->sb_cp_table
= NULL
;
584 sbi
->sb_c_bitmap
= -1;
585 sbi
->sb_max_fwd_alloc
= 0xffffff;
587 if (sbi
->sb_fs_size
>= 0x80000000) {
588 hpfs_error(s
, "invalid size in superblock: %08x",
589 (unsigned)sbi
->sb_fs_size
);
593 /* Load bitmap directory */
594 if (!(sbi
->sb_bmp_dir
= hpfs_load_bitmap_directory(s
, le32_to_cpu(superblock
->bitmaps
))))
597 /* Check for general fs errors*/
598 if (spareblock
->dirty
&& !spareblock
->old_wrote
) {
600 printk("HPFS: Improperly stopped, not mounted\n");
603 hpfs_error(s
, "improperly stopped");
606 if (!(s
->s_flags
& MS_RDONLY
)) {
607 spareblock
->dirty
= 1;
608 spareblock
->old_wrote
= 0;
609 mark_buffer_dirty(bh2
);
612 if (spareblock
->hotfixes_used
|| spareblock
->n_spares_used
) {
614 printk("HPFS: Hotfixes not supported here, try chkdsk\n");
618 hpfs_error(s
, "hotfixes not supported here, try chkdsk");
619 if (errs
== 0) printk("HPFS: Proceeding, but your filesystem will be probably corrupted by this driver...\n");
620 else printk("HPFS: This driver may read bad files or crash when operating on disk with hotfixes.\n");
622 if (le32_to_cpu(spareblock
->n_dnode_spares
) != le32_to_cpu(spareblock
->n_dnode_spares_free
)) {
624 printk("HPFS: Spare dnodes used, try chkdsk\n");
628 hpfs_error(s
, "warning: spare dnodes used, try chkdsk");
629 if (errs
== 0) printk("HPFS: Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
633 if (le32_to_cpu(superblock
->dir_band_end
) - le32_to_cpu(superblock
->dir_band_start
) + 1 != le32_to_cpu(superblock
->n_dir_band
) ||
634 le32_to_cpu(superblock
->dir_band_end
) < le32_to_cpu(superblock
->dir_band_start
) || le32_to_cpu(superblock
->n_dir_band
) > 0x4000) {
635 hpfs_error(s
, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
636 le32_to_cpu(superblock
->dir_band_start
), le32_to_cpu(superblock
->dir_band_end
), le32_to_cpu(superblock
->n_dir_band
));
639 a
= sbi
->sb_dirband_size
;
640 sbi
->sb_dirband_size
= 0;
641 if (hpfs_chk_sectors(s
, le32_to_cpu(superblock
->dir_band_start
), le32_to_cpu(superblock
->n_dir_band
), "dir_band") ||
642 hpfs_chk_sectors(s
, le32_to_cpu(superblock
->dir_band_bitmap
), 4, "dir_band_bitmap") ||
643 hpfs_chk_sectors(s
, le32_to_cpu(superblock
->bitmaps
), 4, "bitmaps")) {
647 sbi
->sb_dirband_size
= a
;
648 } else printk("HPFS: You really don't want any checks? You are crazy...\n");
650 /* Load code page table */
651 if (le32_to_cpu(spareblock
->n_code_pages
))
652 if (!(sbi
->sb_cp_table
= hpfs_load_code_page(s
, le32_to_cpu(spareblock
->code_page_dir
))))
653 printk("HPFS: Warning: code page support is disabled\n");
659 root
= iget_locked(s
, sbi
->sb_root
);
662 hpfs_init_inode(root
);
663 hpfs_read_inode(root
);
664 unlock_new_inode(root
);
665 s
->s_root
= d_make_root(root
);
670 * find the root directory's . pointer & finish filling in the inode
673 root_dno
= hpfs_fnode_dno(s
, sbi
->sb_root
);
675 de
= map_dirent(root
, root_dno
, "\001\001", 2, NULL
, &qbh
);
677 hpfs_error(s
, "unable to find root dir");
679 root
->i_atime
.tv_sec
= local_to_gmt(s
, le32_to_cpu(de
->read_date
));
680 root
->i_atime
.tv_nsec
= 0;
681 root
->i_mtime
.tv_sec
= local_to_gmt(s
, le32_to_cpu(de
->write_date
));
682 root
->i_mtime
.tv_nsec
= 0;
683 root
->i_ctime
.tv_sec
= local_to_gmt(s
, le32_to_cpu(de
->creation_date
));
684 root
->i_ctime
.tv_nsec
= 0;
685 hpfs_i(root
)->i_ea_size
= le32_to_cpu(de
->ea_size
);
686 hpfs_i(root
)->i_parent_dir
= root
->i_ino
;
687 if (root
->i_size
== -1)
689 if (root
->i_blocks
== -1)
706 static struct dentry
*hpfs_mount(struct file_system_type
*fs_type
,
707 int flags
, const char *dev_name
, void *data
)
709 return mount_bdev(fs_type
, flags
, dev_name
, data
, hpfs_fill_super
);
712 static struct file_system_type hpfs_fs_type
= {
713 .owner
= THIS_MODULE
,
716 .kill_sb
= kill_block_super
,
717 .fs_flags
= FS_REQUIRES_DEV
,
719 MODULE_ALIAS_FS("hpfs");
721 static int __init
init_hpfs_fs(void)
723 int err
= init_inodecache();
726 err
= register_filesystem(&hpfs_fs_type
);
731 destroy_inodecache();
736 static void __exit
exit_hpfs_fs(void)
738 unregister_filesystem(&hpfs_fs_type
);
739 destroy_inodecache();
742 module_init(init_hpfs_fs
)
743 module_exit(exit_hpfs_fs
)
744 MODULE_LICENSE("GPL");