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>
16 /* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */
18 static void mark_dirty(struct super_block
*s
)
20 if (hpfs_sb(s
)->sb_chkdsk
&& !(s
->s_flags
& MS_RDONLY
)) {
21 struct buffer_head
*bh
;
22 struct hpfs_spare_block
*sb
;
23 if ((sb
= hpfs_map_sector(s
, 17, &bh
, 0))) {
26 mark_buffer_dirty(bh
);
32 /* Mark the filesystem clean (mark it dirty for chkdsk if chkdsk==2 or if there
35 static void unmark_dirty(struct super_block
*s
)
37 struct buffer_head
*bh
;
38 struct hpfs_spare_block
*sb
;
39 if (s
->s_flags
& MS_RDONLY
) return;
40 if ((sb
= hpfs_map_sector(s
, 17, &bh
, 0))) {
41 sb
->dirty
= hpfs_sb(s
)->sb_chkdsk
> 1 - hpfs_sb(s
)->sb_was_error
;
42 sb
->old_wrote
= hpfs_sb(s
)->sb_chkdsk
>= 2 && !hpfs_sb(s
)->sb_was_error
;
43 mark_buffer_dirty(bh
);
48 /* Filesystem error... */
49 static char err_buf
[1024];
51 void hpfs_error(struct super_block
*s
, const char *fmt
, ...)
56 vsnprintf(err_buf
, sizeof(err_buf
), fmt
, args
);
59 printk("HPFS: filesystem error: %s", err_buf
);
60 if (!hpfs_sb(s
)->sb_was_error
) {
61 if (hpfs_sb(s
)->sb_err
== 2) {
62 printk("; crashing the system because you wanted it\n");
65 } else if (hpfs_sb(s
)->sb_err
== 1) {
66 if (s
->s_flags
& MS_RDONLY
) printk("; already mounted read-only\n");
68 printk("; remounting read-only\n");
70 s
->s_flags
|= MS_RDONLY
;
72 } else if (s
->s_flags
& MS_RDONLY
) printk("; going on - but anything won't be destroyed because it's read-only\n");
73 else printk("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n");
75 hpfs_sb(s
)->sb_was_error
= 1;
79 * A little trick to detect cycles in many hpfs structures and don't let the
80 * kernel crash on corrupted filesystem. When first called, set c2 to 0.
82 * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories
83 * nested each in other, chkdsk locked up happilly.
86 int hpfs_stop_cycles(struct super_block
*s
, int key
, int *c1
, int *c2
,
89 if (*c2
&& *c1
== key
) {
90 hpfs_error(s
, "cycle detected on key %08x in %s", key
, msg
);
94 if (!((*c2
- 1) & *c2
)) *c1
= key
;
98 static void hpfs_put_super(struct super_block
*s
)
100 struct hpfs_sb_info
*sbi
= hpfs_sb(s
);
101 kfree(sbi
->sb_cp_table
);
102 kfree(sbi
->sb_bmp_dir
);
108 unsigned hpfs_count_one_bitmap(struct super_block
*s
, secno secno
)
110 struct quad_buffer_head qbh
;
113 if (!(bits
= hpfs_map_4sectors(s
, secno
, &qbh
, 4))) return 0;
115 for (i
= 0; i
< 2048 / sizeof(unsigned); i
++) {
117 if (!bits
[i
]) continue;
118 for (b
= bits
[i
]; b
; b
>>=1) count
+= b
& 1;
124 static unsigned count_bitmaps(struct super_block
*s
)
126 unsigned n
, count
, n_bands
;
127 n_bands
= (hpfs_sb(s
)->sb_fs_size
+ 0x3fff) >> 14;
129 for (n
= 0; n
< n_bands
; n
++)
130 count
+= hpfs_count_one_bitmap(s
, hpfs_sb(s
)->sb_bmp_dir
[n
]);
134 static int hpfs_statfs(struct dentry
*dentry
, struct kstatfs
*buf
)
136 struct super_block
*s
= dentry
->d_sb
;
137 struct hpfs_sb_info
*sbi
= hpfs_sb(s
);
140 /*if (sbi->sb_n_free == -1) {*/
141 sbi
->sb_n_free
= count_bitmaps(s
);
142 sbi
->sb_n_free_dnodes
= hpfs_count_one_bitmap(s
, sbi
->sb_dmap
);
144 buf
->f_type
= s
->s_magic
;
146 buf
->f_blocks
= sbi
->sb_fs_size
;
147 buf
->f_bfree
= sbi
->sb_n_free
;
148 buf
->f_bavail
= sbi
->sb_n_free
;
149 buf
->f_files
= sbi
->sb_dirband_size
/ 4;
150 buf
->f_ffree
= sbi
->sb_n_free_dnodes
;
151 buf
->f_namelen
= 254;
158 static struct kmem_cache
* hpfs_inode_cachep
;
160 static struct inode
*hpfs_alloc_inode(struct super_block
*sb
)
162 struct hpfs_inode_info
*ei
;
163 ei
= (struct hpfs_inode_info
*)kmem_cache_alloc(hpfs_inode_cachep
, GFP_NOFS
);
166 ei
->vfs_inode
.i_version
= 1;
167 return &ei
->vfs_inode
;
170 static void hpfs_destroy_inode(struct inode
*inode
)
172 kmem_cache_free(hpfs_inode_cachep
, hpfs_i(inode
));
175 static void init_once(void * foo
, struct kmem_cache
* cachep
, unsigned long flags
)
177 struct hpfs_inode_info
*ei
= (struct hpfs_inode_info
*) foo
;
179 if ((flags
& (SLAB_CTOR_VERIFY
|SLAB_CTOR_CONSTRUCTOR
)) ==
180 SLAB_CTOR_CONSTRUCTOR
) {
181 mutex_init(&ei
->i_mutex
);
182 mutex_init(&ei
->i_parent_mutex
);
183 inode_init_once(&ei
->vfs_inode
);
187 static int init_inodecache(void)
189 hpfs_inode_cachep
= kmem_cache_create("hpfs_inode_cache",
190 sizeof(struct hpfs_inode_info
),
191 0, (SLAB_RECLAIM_ACCOUNT
|
194 if (hpfs_inode_cachep
== NULL
)
199 static void destroy_inodecache(void)
201 kmem_cache_destroy(hpfs_inode_cachep
);
205 * A tiny parser for option strings, stolen from dosfs.
206 * Stolen again from read-only hpfs.
207 * And updated for table-driven option parsing.
211 Opt_help
, Opt_uid
, Opt_gid
, Opt_umask
, Opt_case_lower
, Opt_case_asis
,
212 Opt_conv_binary
, Opt_conv_text
, Opt_conv_auto
,
213 Opt_check_none
, Opt_check_normal
, Opt_check_strict
,
214 Opt_err_cont
, Opt_err_ro
, Opt_err_panic
,
215 Opt_eas_no
, Opt_eas_ro
, Opt_eas_rw
,
216 Opt_chkdsk_no
, Opt_chkdsk_errors
, Opt_chkdsk_always
,
217 Opt_timeshift
, Opt_err
,
220 static match_table_t tokens
= {
224 {Opt_umask
, "umask=%o"},
225 {Opt_case_lower
, "case=lower"},
226 {Opt_case_asis
, "case=asis"},
227 {Opt_conv_binary
, "conv=binary"},
228 {Opt_conv_text
, "conv=text"},
229 {Opt_conv_auto
, "conv=auto"},
230 {Opt_check_none
, "check=none"},
231 {Opt_check_normal
, "check=normal"},
232 {Opt_check_strict
, "check=strict"},
233 {Opt_err_cont
, "errors=continue"},
234 {Opt_err_ro
, "errors=remount-ro"},
235 {Opt_err_panic
, "errors=panic"},
236 {Opt_eas_no
, "eas=no"},
237 {Opt_eas_ro
, "eas=ro"},
238 {Opt_eas_rw
, "eas=rw"},
239 {Opt_chkdsk_no
, "chkdsk=no"},
240 {Opt_chkdsk_errors
, "chkdsk=errors"},
241 {Opt_chkdsk_always
, "chkdsk=always"},
242 {Opt_timeshift
, "timeshift=%d"},
246 static int parse_opts(char *opts
, uid_t
*uid
, gid_t
*gid
, umode_t
*umask
,
247 int *lowercase
, int *conv
, int *eas
, int *chk
, int *errs
,
248 int *chkdsk
, int *timeshift
)
256 /*printk("Parsing opts: '%s'\n",opts);*/
258 while ((p
= strsep(&opts
, ",")) != NULL
) {
259 substring_t args
[MAX_OPT_ARGS
];
264 token
= match_token(p
, tokens
, args
);
269 if (match_int(args
, &option
))
274 if (match_int(args
, &option
))
279 if (match_octal(args
, &option
))
289 case Opt_conv_binary
:
301 case Opt_check_normal
:
304 case Opt_check_strict
:
328 case Opt_chkdsk_errors
:
331 case Opt_chkdsk_always
:
337 char *rhs
= args
[0].from
;
340 if (*rhs
== '-') m
= -1;
341 if (*rhs
== '+' || *rhs
== '-') rhs
++;
342 *timeshift
= simple_strtoul(rhs
, &rhs
, 0) * m
;
354 static inline void hpfs_help(void)
357 HPFS filesystem options:\n\
358 help do not mount and display this text\n\
359 uid=xxx set uid of files that don't have uid specified in eas\n\
360 gid=xxx set gid of files that don't have gid specified in eas\n\
361 umask=xxx set mode of files that don't have mode specified in eas\n\
362 case=lower lowercase all files\n\
363 case=asis do not lowercase files (default)\n\
364 conv=binary do not convert CR/LF -> LF (default)\n\
365 conv=auto convert only files with known text extensions\n\
366 conv=text convert all files\n\
367 check=none no fs checks - kernel may crash on corrupted filesystem\n\
368 check=normal do some checks - it should not crash (default)\n\
369 check=strict do extra time-consuming checks, used for debugging\n\
370 errors=continue continue on errors\n\
371 errors=remount-ro remount read-only if errors found (default)\n\
372 errors=panic panic on errors\n\
373 chkdsk=no do not mark fs for chkdsking even if there were errors\n\
374 chkdsk=errors mark fs dirty if errors found (default)\n\
375 chkdsk=always always mark fs dirty - used for debugging\n\
376 eas=no ignore extended attributes\n\
377 eas=ro read but do not write extended attributes\n\
378 eas=rw r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
379 timeshift=nnn add nnn seconds to file times\n\
383 static int hpfs_remount_fs(struct super_block
*s
, int *flags
, char *data
)
388 int lowercase
, conv
, eas
, chk
, errs
, chkdsk
, timeshift
;
390 struct hpfs_sb_info
*sbi
= hpfs_sb(s
);
392 *flags
|= MS_NOATIME
;
394 uid
= sbi
->sb_uid
; gid
= sbi
->sb_gid
;
395 umask
= 0777 & ~sbi
->sb_mode
;
396 lowercase
= sbi
->sb_lowercase
; conv
= sbi
->sb_conv
;
397 eas
= sbi
->sb_eas
; chk
= sbi
->sb_chk
; chkdsk
= sbi
->sb_chkdsk
;
398 errs
= sbi
->sb_err
; timeshift
= sbi
->sb_timeshift
;
400 if (!(o
= parse_opts(data
, &uid
, &gid
, &umask
, &lowercase
, &conv
,
401 &eas
, &chk
, &errs
, &chkdsk
, ×hift
))) {
402 printk("HPFS: bad mount options.\n");
409 if (timeshift
!= sbi
->sb_timeshift
) {
410 printk("HPFS: timeshift can't be changed using remount.\n");
416 sbi
->sb_uid
= uid
; sbi
->sb_gid
= gid
;
417 sbi
->sb_mode
= 0777 & ~umask
;
418 sbi
->sb_lowercase
= lowercase
; sbi
->sb_conv
= conv
;
419 sbi
->sb_eas
= eas
; sbi
->sb_chk
= chk
; sbi
->sb_chkdsk
= chkdsk
;
420 sbi
->sb_err
= errs
; sbi
->sb_timeshift
= timeshift
;
422 if (!(*flags
& MS_RDONLY
)) mark_dirty(s
);
427 /* Super operations */
429 static struct super_operations hpfs_sops
=
431 .alloc_inode
= hpfs_alloc_inode
,
432 .destroy_inode
= hpfs_destroy_inode
,
433 .delete_inode
= hpfs_delete_inode
,
434 .put_super
= hpfs_put_super
,
435 .statfs
= hpfs_statfs
,
436 .remount_fs
= hpfs_remount_fs
,
439 static int hpfs_fill_super(struct super_block
*s
, void *options
, int silent
)
441 struct buffer_head
*bh0
, *bh1
, *bh2
;
442 struct hpfs_boot_block
*bootblock
;
443 struct hpfs_super_block
*superblock
;
444 struct hpfs_spare_block
*spareblock
;
445 struct hpfs_sb_info
*sbi
;
451 int lowercase
, conv
, eas
, chk
, errs
, chkdsk
, timeshift
;
453 dnode_secno root_dno
;
454 struct hpfs_dirent
*de
= NULL
;
455 struct quad_buffer_head qbh
;
459 sbi
= kzalloc(sizeof(*sbi
), GFP_KERNEL
);
464 sbi
->sb_bmp_dir
= NULL
;
465 sbi
->sb_cp_table
= NULL
;
467 init_MUTEX(&sbi
->hpfs_creation_de
);
471 umask
= current
->fs
->umask
;
480 if (!(o
= parse_opts(options
, &uid
, &gid
, &umask
, &lowercase
, &conv
,
481 &eas
, &chk
, &errs
, &chkdsk
, ×hift
))) {
482 printk("HPFS: bad mount options.\n");
490 /*sbi->sb_mounting = 1;*/
491 sb_set_blocksize(s
, 512);
492 sbi
->sb_fs_size
= -1;
493 if (!(bootblock
= hpfs_map_sector(s
, 0, &bh0
, 0))) goto bail1
;
494 if (!(superblock
= hpfs_map_sector(s
, 16, &bh1
, 1))) goto bail2
;
495 if (!(spareblock
= hpfs_map_sector(s
, 17, &bh2
, 0))) goto bail3
;
498 if (/*bootblock->magic != BB_MAGIC
499 ||*/ superblock
->magic
!= SB_MAGIC
500 || spareblock
->magic
!= SP_MAGIC
) {
501 if (!silent
) printk("HPFS: Bad magic ... probably not HPFS\n");
506 if (!(s
->s_flags
& MS_RDONLY
) &&
507 superblock
->funcversion
!= 2 && superblock
->funcversion
!= 3) {
508 printk("HPFS: Bad version %d,%d. Mount readonly to go around\n",
509 (int)superblock
->version
, (int)superblock
->funcversion
);
510 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");
514 s
->s_flags
|= MS_NOATIME
;
516 /* Fill superblock stuff */
517 s
->s_magic
= HPFS_SUPER_MAGIC
;
518 s
->s_op
= &hpfs_sops
;
520 sbi
->sb_root
= superblock
->root
;
521 sbi
->sb_fs_size
= superblock
->n_sectors
;
522 sbi
->sb_bitmaps
= superblock
->bitmaps
;
523 sbi
->sb_dirband_start
= superblock
->dir_band_start
;
524 sbi
->sb_dirband_size
= superblock
->n_dir_band
;
525 sbi
->sb_dmap
= superblock
->dir_band_bitmap
;
528 sbi
->sb_mode
= 0777 & ~umask
;
530 sbi
->sb_n_free_dnodes
= -1;
531 sbi
->sb_lowercase
= lowercase
;
535 sbi
->sb_chkdsk
= chkdsk
;
537 sbi
->sb_timeshift
= timeshift
;
538 sbi
->sb_was_error
= 0;
539 sbi
->sb_cp_table
= NULL
;
540 sbi
->sb_c_bitmap
= -1;
541 sbi
->sb_max_fwd_alloc
= 0xffffff;
543 /* Load bitmap directory */
544 if (!(sbi
->sb_bmp_dir
= hpfs_load_bitmap_directory(s
, superblock
->bitmaps
)))
547 /* Check for general fs errors*/
548 if (spareblock
->dirty
&& !spareblock
->old_wrote
) {
550 printk("HPFS: Improperly stopped, not mounted\n");
553 hpfs_error(s
, "improperly stopped");
556 if (!(s
->s_flags
& MS_RDONLY
)) {
557 spareblock
->dirty
= 1;
558 spareblock
->old_wrote
= 0;
559 mark_buffer_dirty(bh2
);
562 if (spareblock
->hotfixes_used
|| spareblock
->n_spares_used
) {
564 printk("HPFS: Hotfixes not supported here, try chkdsk\n");
568 hpfs_error(s
, "hotfixes not supported here, try chkdsk");
569 if (errs
== 0) printk("HPFS: Proceeding, but your filesystem will be probably corrupted by this driver...\n");
570 else printk("HPFS: This driver may read bad files or crash when operating on disk with hotfixes.\n");
572 if (spareblock
->n_dnode_spares
!= spareblock
->n_dnode_spares_free
) {
574 printk("HPFS: Spare dnodes used, try chkdsk\n");
578 hpfs_error(s
, "warning: spare dnodes used, try chkdsk");
579 if (errs
== 0) printk("HPFS: Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
583 if (superblock
->dir_band_end
- superblock
->dir_band_start
+ 1 != superblock
->n_dir_band
||
584 superblock
->dir_band_end
< superblock
->dir_band_start
|| superblock
->n_dir_band
> 0x4000) {
585 hpfs_error(s
, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
586 superblock
->dir_band_start
, superblock
->dir_band_end
, superblock
->n_dir_band
);
589 a
= sbi
->sb_dirband_size
;
590 sbi
->sb_dirband_size
= 0;
591 if (hpfs_chk_sectors(s
, superblock
->dir_band_start
, superblock
->n_dir_band
, "dir_band") ||
592 hpfs_chk_sectors(s
, superblock
->dir_band_bitmap
, 4, "dir_band_bitmap") ||
593 hpfs_chk_sectors(s
, superblock
->bitmaps
, 4, "bitmaps")) {
597 sbi
->sb_dirband_size
= a
;
598 } else printk("HPFS: You really don't want any checks? You are crazy...\n");
600 /* Load code page table */
601 if (spareblock
->n_code_pages
)
602 if (!(sbi
->sb_cp_table
= hpfs_load_code_page(s
, spareblock
->code_page_dir
)))
603 printk("HPFS: Warning: code page support is disabled\n");
609 root
= iget_locked(s
, sbi
->sb_root
);
612 hpfs_init_inode(root
);
613 hpfs_read_inode(root
);
614 unlock_new_inode(root
);
615 s
->s_root
= d_alloc_root(root
);
620 hpfs_set_dentry_operations(s
->s_root
);
623 * find the root directory's . pointer & finish filling in the inode
626 root_dno
= hpfs_fnode_dno(s
, sbi
->sb_root
);
628 de
= map_dirent(root
, root_dno
, "\001\001", 2, NULL
, &qbh
);
630 hpfs_error(s
, "unable to find root dir");
632 root
->i_atime
.tv_sec
= local_to_gmt(s
, de
->read_date
);
633 root
->i_atime
.tv_nsec
= 0;
634 root
->i_mtime
.tv_sec
= local_to_gmt(s
, de
->write_date
);
635 root
->i_mtime
.tv_nsec
= 0;
636 root
->i_ctime
.tv_sec
= local_to_gmt(s
, de
->creation_date
);
637 root
->i_ctime
.tv_nsec
= 0;
638 hpfs_i(root
)->i_ea_size
= de
->ea_size
;
639 hpfs_i(root
)->i_parent_dir
= root
->i_ino
;
640 if (root
->i_size
== -1)
642 if (root
->i_blocks
== -1)
653 kfree(sbi
->sb_bmp_dir
);
654 kfree(sbi
->sb_cp_table
);
660 static int hpfs_get_sb(struct file_system_type
*fs_type
,
661 int flags
, const char *dev_name
, void *data
, struct vfsmount
*mnt
)
663 return get_sb_bdev(fs_type
, flags
, dev_name
, data
, hpfs_fill_super
,
667 static struct file_system_type hpfs_fs_type
= {
668 .owner
= THIS_MODULE
,
670 .get_sb
= hpfs_get_sb
,
671 .kill_sb
= kill_block_super
,
672 .fs_flags
= FS_REQUIRES_DEV
,
675 static int __init
init_hpfs_fs(void)
677 int err
= init_inodecache();
680 err
= register_filesystem(&hpfs_fs_type
);
685 destroy_inodecache();
690 static void __exit
exit_hpfs_fs(void)
692 unregister_filesystem(&hpfs_fs_type
);
693 destroy_inodecache();
696 module_init(init_hpfs_fs
)
697 module_exit(exit_hpfs_fs
)
698 MODULE_LICENSE("GPL");