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 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
++) {
147 hpfs_prefetch_bitmap(s
, n
+ COUNT_RD_AHEAD
);
148 count
+= hpfs_count_one_bitmap(s
, le32_to_cpu(hpfs_sb(s
)->sb_bmp_dir
[n
]));
153 static int hpfs_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
155 struct super_block
*s
= dentry
->d_sb
;
156 struct hpfs_sb_info
*sbi
= hpfs_sb(s
);
157 u64 id
= huge_encode_dev(s
->s_bdev
->bd_dev
);
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
);
164 buf
->f_type
= s
->s_magic
;
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
;
171 buf
->f_fsid
.val
[0] = (u32
)id
;
172 buf
->f_fsid
.val
[1] = (u32
)(id
>> 32);
173 buf
->f_namelen
= 254;
180 static struct kmem_cache
* hpfs_inode_cachep
;
182 static struct inode
*hpfs_alloc_inode(struct super_block
*sb
)
184 struct hpfs_inode_info
*ei
;
185 ei
= (struct hpfs_inode_info
*)kmem_cache_alloc(hpfs_inode_cachep
, GFP_NOFS
);
188 ei
->vfs_inode
.i_version
= 1;
189 return &ei
->vfs_inode
;
192 static void hpfs_i_callback(struct rcu_head
*head
)
194 struct inode
*inode
= container_of(head
, struct inode
, i_rcu
);
195 kmem_cache_free(hpfs_inode_cachep
, hpfs_i(inode
));
198 static void hpfs_destroy_inode(struct inode
*inode
)
200 call_rcu(&inode
->i_rcu
, hpfs_i_callback
);
203 static void init_once(void *foo
)
205 struct hpfs_inode_info
*ei
= (struct hpfs_inode_info
*) foo
;
207 inode_init_once(&ei
->vfs_inode
);
210 static int init_inodecache(void)
212 hpfs_inode_cachep
= kmem_cache_create("hpfs_inode_cache",
213 sizeof(struct hpfs_inode_info
),
214 0, (SLAB_RECLAIM_ACCOUNT
|
217 if (hpfs_inode_cachep
== NULL
)
222 static void destroy_inodecache(void)
225 * Make sure all delayed rcu free inodes are flushed before we
229 kmem_cache_destroy(hpfs_inode_cachep
);
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.
239 Opt_help
, Opt_uid
, Opt_gid
, Opt_umask
, Opt_case_lower
, Opt_case_asis
,
240 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
,
247 static const match_table_t tokens
= {
251 {Opt_umask
, "umask=%o"},
252 {Opt_case_lower
, "case=lower"},
253 {Opt_case_asis
, "case=asis"},
254 {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"},
270 static int parse_opts(char *opts
, kuid_t
*uid
, kgid_t
*gid
, umode_t
*umask
,
271 int *lowercase
, int *eas
, int *chk
, int *errs
,
272 int *chkdsk
, int *timeshift
)
280 /*printk("Parsing opts: '%s'\n",opts);*/
282 while ((p
= strsep(&opts
, ",")) != NULL
) {
283 substring_t args
[MAX_OPT_ARGS
];
288 token
= match_token(p
, tokens
, args
);
293 if (match_int(args
, &option
))
295 *uid
= make_kuid(current_user_ns(), option
);
296 if (!uid_valid(*uid
))
300 if (match_int(args
, &option
))
302 *gid
= make_kgid(current_user_ns(), option
);
303 if (!gid_valid(*gid
))
307 if (match_octal(args
, &option
))
320 case Opt_check_normal
:
323 case Opt_check_strict
:
347 case Opt_chkdsk_errors
:
350 case Opt_chkdsk_always
:
356 char *rhs
= args
[0].from
;
359 if (*rhs
== '-') m
= -1;
360 if (*rhs
== '+' || *rhs
== '-') rhs
++;
361 *timeshift
= simple_strtoul(rhs
, &rhs
, 0) * m
;
373 static inline void hpfs_help(void)
376 HPFS 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\
383 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\
399 static int hpfs_remount_fs(struct super_block
*s
, int *flags
, char *data
)
404 int lowercase
, eas
, chk
, errs
, chkdsk
, timeshift
;
406 struct hpfs_sb_info
*sbi
= hpfs_sb(s
);
407 char *new_opts
= kstrdup(data
, GFP_KERNEL
);
409 *flags
|= MS_NOATIME
;
412 uid
= sbi
->sb_uid
; gid
= sbi
->sb_gid
;
413 umask
= 0777 & ~sbi
->sb_mode
;
414 lowercase
= sbi
->sb_lowercase
;
415 eas
= sbi
->sb_eas
; chk
= sbi
->sb_chk
; chkdsk
= sbi
->sb_chkdsk
;
416 errs
= sbi
->sb_err
; timeshift
= sbi
->sb_timeshift
;
418 if (!(o
= parse_opts(data
, &uid
, &gid
, &umask
, &lowercase
,
419 &eas
, &chk
, &errs
, &chkdsk
, ×hift
))) {
420 printk("HPFS: bad mount options.\n");
427 if (timeshift
!= sbi
->sb_timeshift
) {
428 printk("HPFS: timeshift can't be changed using remount.\n");
434 sbi
->sb_uid
= uid
; sbi
->sb_gid
= gid
;
435 sbi
->sb_mode
= 0777 & ~umask
;
436 sbi
->sb_lowercase
= lowercase
;
437 sbi
->sb_eas
= eas
; sbi
->sb_chk
= chk
; sbi
->sb_chkdsk
= chkdsk
;
438 sbi
->sb_err
= errs
; sbi
->sb_timeshift
= timeshift
;
440 if (!(*flags
& MS_RDONLY
)) mark_dirty(s
, 1);
442 replace_mount_options(s
, new_opts
);
453 /* Super operations */
455 static const struct super_operations hpfs_sops
=
457 .alloc_inode
= hpfs_alloc_inode
,
458 .destroy_inode
= hpfs_destroy_inode
,
459 .evict_inode
= hpfs_evict_inode
,
460 .put_super
= hpfs_put_super
,
461 .statfs
= hpfs_statfs
,
462 .remount_fs
= hpfs_remount_fs
,
463 .show_options
= generic_show_options
,
466 static int hpfs_fill_super(struct super_block
*s
, void *options
, int silent
)
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
;
478 int lowercase
, eas
, chk
, errs
, chkdsk
, timeshift
;
480 dnode_secno root_dno
;
481 struct hpfs_dirent
*de
= NULL
;
482 struct quad_buffer_head qbh
;
486 save_mount_options(s
, options
);
488 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
494 mutex_init(&sbi
->hpfs_mutex
);
499 umask
= current_umask();
507 if (!(o
= parse_opts(options
, &uid
, &gid
, &umask
, &lowercase
,
508 &eas
, &chk
, &errs
, &chkdsk
, ×hift
))) {
509 printk("HPFS: bad mount options.\n");
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
;
525 if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC
526 ||*/ le32_to_cpu(superblock
->magic
) != SB_MAGIC
527 || le32_to_cpu(spareblock
->magic
) != SP_MAGIC
) {
528 if (!silent
) printk("HPFS: Bad magic ... probably not HPFS\n");
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");
541 s
->s_flags
|= MS_NOATIME
;
543 /* Fill superblock stuff */
544 s
->s_magic
= HPFS_SUPER_MAGIC
;
545 s
->s_op
= &hpfs_sops
;
546 s
->s_d_op
= &hpfs_dentry_operations
;
548 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
);
556 sbi
->sb_mode
= 0777 & ~umask
;
558 sbi
->sb_n_free_dnodes
= -1;
559 sbi
->sb_lowercase
= lowercase
;
562 sbi
->sb_chkdsk
= chkdsk
;
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;
570 if (sbi
->sb_fs_size
>= 0x80000000) {
571 hpfs_error(s
, "invalid size in superblock: %08x",
572 (unsigned)sbi
->sb_fs_size
);
576 /* Load bitmap directory */
577 if (!(sbi
->sb_bmp_dir
= hpfs_load_bitmap_directory(s
, le32_to_cpu(superblock
->bitmaps
))))
580 /* Check for general fs errors*/
581 if (spareblock
->dirty
&& !spareblock
->old_wrote
) {
583 printk("HPFS: Improperly stopped, not mounted\n");
586 hpfs_error(s
, "improperly stopped");
589 if (!(s
->s_flags
& MS_RDONLY
)) {
590 spareblock
->dirty
= 1;
591 spareblock
->old_wrote
= 0;
592 mark_buffer_dirty(bh2
);
595 if (spareblock
->hotfixes_used
|| spareblock
->n_spares_used
) {
597 printk("HPFS: Hotfixes not supported here, try chkdsk\n");
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");
605 if (le32_to_cpu(spareblock
->n_dnode_spares
) != le32_to_cpu(spareblock
->n_dnode_spares_free
)) {
607 printk("HPFS: Spare dnodes used, try chkdsk\n");
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");
616 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) {
618 hpfs_error(s
, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
619 le32_to_cpu(superblock
->dir_band_start
), le32_to_cpu(superblock
->dir_band_end
), le32_to_cpu(superblock
->n_dir_band
));
622 a
= sbi
->sb_dirband_size
;
623 sbi
->sb_dirband_size
= 0;
624 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")) {
630 sbi
->sb_dirband_size
= a
;
631 } else printk("HPFS: You really don't want any checks? You are crazy...\n");
633 /* Load code page table */
634 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
))))
636 printk("HPFS: Warning: code page support is disabled\n");
642 root
= iget_locked(s
, sbi
->sb_root
);
645 hpfs_init_inode(root
);
646 hpfs_read_inode(root
);
647 unlock_new_inode(root
);
648 s
->s_root
= d_make_root(root
);
653 * find the root directory's . pointer & finish filling in the inode
656 root_dno
= hpfs_fnode_dno(s
, sbi
->sb_root
);
658 de
= map_dirent(root
, root_dno
, "\001\001", 2, NULL
, &qbh
);
660 hpfs_error(s
, "unable to find root dir");
662 root
->i_atime
.tv_sec
= local_to_gmt(s
, le32_to_cpu(de
->read_date
));
663 root
->i_atime
.tv_nsec
= 0;
664 root
->i_mtime
.tv_sec
= local_to_gmt(s
, le32_to_cpu(de
->write_date
));
665 root
->i_mtime
.tv_nsec
= 0;
666 root
->i_ctime
.tv_sec
= local_to_gmt(s
, le32_to_cpu(de
->creation_date
));
667 root
->i_ctime
.tv_nsec
= 0;
668 hpfs_i(root
)->i_ea_size
= le32_to_cpu(de
->ea_size
);
669 hpfs_i(root
)->i_parent_dir
= root
->i_ino
;
670 if (root
->i_size
== -1)
672 if (root
->i_blocks
== -1)
689 static struct dentry
*hpfs_mount(struct file_system_type
*fs_type
,
690 int flags
, const char *dev_name
, void *data
)
692 return mount_bdev(fs_type
, flags
, dev_name
, data
, hpfs_fill_super
);
695 static struct file_system_type hpfs_fs_type
= {
696 .owner
= THIS_MODULE
,
699 .kill_sb
= kill_block_super
,
700 .fs_flags
= FS_REQUIRES_DEV
,
702 MODULE_ALIAS_FS("hpfs");
704 static int __init
init_hpfs_fs(void)
706 int err
= init_inodecache();
709 err
= register_filesystem(&hpfs_fs_type
);
714 destroy_inodecache();
719 static void __exit
exit_hpfs_fs(void)
721 unregister_filesystem(&hpfs_fs_type
);
722 destroy_inodecache();
725 module_init(init_hpfs_fs
)
726 module_exit(exit_hpfs_fs
)
727 MODULE_LICENSE("GPL");