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 mutex_init(&ei->i_mutex);
180 mutex_init(&ei->i_parent_mutex);
181 inode_init_once(&ei->vfs_inode);
184 static int init_inodecache(void)
186 hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache",
187 sizeof(struct hpfs_inode_info),
188 0, (SLAB_RECLAIM_ACCOUNT|
191 if (hpfs_inode_cachep == NULL)
196 static void destroy_inodecache(void)
198 kmem_cache_destroy(hpfs_inode_cachep);
202 * A tiny parser for option strings, stolen from dosfs.
203 * Stolen again from read-only hpfs.
204 * And updated for table-driven option parsing.
208 Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis,
209 Opt_conv_binary, Opt_conv_text, Opt_conv_auto,
210 Opt_check_none, Opt_check_normal, Opt_check_strict,
211 Opt_err_cont, Opt_err_ro, Opt_err_panic,
212 Opt_eas_no, Opt_eas_ro, Opt_eas_rw,
213 Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always,
214 Opt_timeshift, Opt_err,
217 static match_table_t tokens = {
221 {Opt_umask, "umask=%o"},
222 {Opt_case_lower, "case=lower"},
223 {Opt_case_asis, "case=asis"},
224 {Opt_conv_binary, "conv=binary"},
225 {Opt_conv_text, "conv=text"},
226 {Opt_conv_auto, "conv=auto"},
227 {Opt_check_none, "check=none"},
228 {Opt_check_normal, "check=normal"},
229 {Opt_check_strict, "check=strict"},
230 {Opt_err_cont, "errors=continue"},
231 {Opt_err_ro, "errors=remount-ro"},
232 {Opt_err_panic, "errors=panic"},
233 {Opt_eas_no, "eas=no"},
234 {Opt_eas_ro, "eas=ro"},
235 {Opt_eas_rw, "eas=rw"},
236 {Opt_chkdsk_no, "chkdsk=no"},
237 {Opt_chkdsk_errors, "chkdsk=errors"},
238 {Opt_chkdsk_always, "chkdsk=always"},
239 {Opt_timeshift, "timeshift=%d"},
243 static int parse_opts(char *opts, uid_t *uid, gid_t *gid, umode_t *umask,
244 int *lowercase, int *conv, int *eas, int *chk, int *errs,
245 int *chkdsk, int *timeshift)
253 /*printk("Parsing opts: '%s'\n",opts);*/
255 while ((p = strsep(&opts, ",")) != NULL) {
256 substring_t args[MAX_OPT_ARGS];
261 token = match_token(p, tokens, args);
266 if (match_int(args, &option))
271 if (match_int(args, &option))
276 if (match_octal(args, &option))
286 case Opt_conv_binary:
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 conv=binary do not convert CR/LF -> LF (default)\n\
362 conv=auto convert only files with known text extensions\n\
363 conv=text convert all files\n\
364 check=none no fs checks - kernel may crash on corrupted filesystem\n\
365 check=normal do some checks - it should not crash (default)\n\
366 check=strict do extra time-consuming checks, used for debugging\n\
367 errors=continue continue on errors\n\
368 errors=remount-ro remount read-only if errors found (default)\n\
369 errors=panic panic on errors\n\
370 chkdsk=no do not mark fs for chkdsking even if there were errors\n\
371 chkdsk=errors mark fs dirty if errors found (default)\n\
372 chkdsk=always always mark fs dirty - used for debugging\n\
373 eas=no ignore extended attributes\n\
374 eas=ro read but do not write extended attributes\n\
375 eas=rw r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
376 timeshift=nnn add nnn seconds to file times\n\
380 static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
385 int lowercase, conv, eas, chk, errs, chkdsk, timeshift;
387 struct hpfs_sb_info *sbi = hpfs_sb(s);
389 *flags |= MS_NOATIME;
391 uid = sbi->sb_uid; gid = sbi->sb_gid;
392 umask = 0777 & ~sbi->sb_mode;
393 lowercase = sbi->sb_lowercase; conv = sbi->sb_conv;
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, &conv,
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; sbi->sb_conv = conv;
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);
424 /* Super operations */
426 static const struct super_operations hpfs_sops =
428 .alloc_inode = hpfs_alloc_inode,
429 .destroy_inode = hpfs_destroy_inode,
430 .delete_inode = hpfs_delete_inode,
431 .put_super = hpfs_put_super,
432 .statfs = hpfs_statfs,
433 .remount_fs = hpfs_remount_fs,
436 static int hpfs_fill_super(struct super_block *s, void *options, int silent)
438 struct buffer_head *bh0, *bh1, *bh2;
439 struct hpfs_boot_block *bootblock;
440 struct hpfs_super_block *superblock;
441 struct hpfs_spare_block *spareblock;
442 struct hpfs_sb_info *sbi;
448 int lowercase, conv, eas, chk, errs, chkdsk, timeshift;
450 dnode_secno root_dno;
451 struct hpfs_dirent *de = NULL;
452 struct quad_buffer_head qbh;
456 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
461 sbi->sb_bmp_dir = NULL;
462 sbi->sb_cp_table = NULL;
464 init_MUTEX(&sbi->hpfs_creation_de);
468 umask = current->fs->umask;
477 if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase, &conv,
478 &eas, &chk, &errs, &chkdsk, ×hift))) {
479 printk("HPFS: bad mount options.\n");
487 /*sbi->sb_mounting = 1;*/
488 sb_set_blocksize(s, 512);
489 sbi->sb_fs_size = -1;
490 if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
491 if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
492 if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;
495 if (/*bootblock->magic != BB_MAGIC
496 ||*/ superblock->magic != SB_MAGIC
497 || spareblock->magic != SP_MAGIC) {
498 if (!silent) printk("HPFS: Bad magic ... probably not HPFS\n");
503 if (!(s->s_flags & MS_RDONLY) &&
504 superblock->funcversion != 2 && superblock->funcversion != 3) {
505 printk("HPFS: Bad version %d,%d. Mount readonly to go around\n",
506 (int)superblock->version, (int)superblock->funcversion);
507 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");
511 s->s_flags |= MS_NOATIME;
513 /* Fill superblock stuff */
514 s->s_magic = HPFS_SUPER_MAGIC;
515 s->s_op = &hpfs_sops;
517 sbi->sb_root = superblock->root;
518 sbi->sb_fs_size = superblock->n_sectors;
519 sbi->sb_bitmaps = superblock->bitmaps;
520 sbi->sb_dirband_start = superblock->dir_band_start;
521 sbi->sb_dirband_size = superblock->n_dir_band;
522 sbi->sb_dmap = superblock->dir_band_bitmap;
525 sbi->sb_mode = 0777 & ~umask;
527 sbi->sb_n_free_dnodes = -1;
528 sbi->sb_lowercase = lowercase;
532 sbi->sb_chkdsk = chkdsk;
534 sbi->sb_timeshift = timeshift;
535 sbi->sb_was_error = 0;
536 sbi->sb_cp_table = NULL;
537 sbi->sb_c_bitmap = -1;
538 sbi->sb_max_fwd_alloc = 0xffffff;
540 /* Load bitmap directory */
541 if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, superblock->bitmaps)))
544 /* Check for general fs errors*/
545 if (spareblock->dirty && !spareblock->old_wrote) {
547 printk("HPFS: Improperly stopped, not mounted\n");
550 hpfs_error(s, "improperly stopped");
553 if (!(s->s_flags & MS_RDONLY)) {
554 spareblock->dirty = 1;
555 spareblock->old_wrote = 0;
556 mark_buffer_dirty(bh2);
559 if (spareblock->hotfixes_used || spareblock->n_spares_used) {
561 printk("HPFS: Hotfixes not supported here, try chkdsk\n");
565 hpfs_error(s, "hotfixes not supported here, try chkdsk");
566 if (errs == 0) printk("HPFS: Proceeding, but your filesystem will be probably corrupted by this driver...\n");
567 else printk("HPFS: This driver may read bad files or crash when operating on disk with hotfixes.\n");
569 if (spareblock->n_dnode_spares != spareblock->n_dnode_spares_free) {
571 printk("HPFS: Spare dnodes used, try chkdsk\n");
575 hpfs_error(s, "warning: spare dnodes used, try chkdsk");
576 if (errs == 0) printk("HPFS: Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
580 if (superblock->dir_band_end - superblock->dir_band_start + 1 != superblock->n_dir_band ||
581 superblock->dir_band_end < superblock->dir_band_start || superblock->n_dir_band > 0x4000) {
582 hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
583 superblock->dir_band_start, superblock->dir_band_end, superblock->n_dir_band);
586 a = sbi->sb_dirband_size;
587 sbi->sb_dirband_size = 0;
588 if (hpfs_chk_sectors(s, superblock->dir_band_start, superblock->n_dir_band, "dir_band") ||
589 hpfs_chk_sectors(s, superblock->dir_band_bitmap, 4, "dir_band_bitmap") ||
590 hpfs_chk_sectors(s, superblock->bitmaps, 4, "bitmaps")) {
594 sbi->sb_dirband_size = a;
595 } else printk("HPFS: You really don't want any checks? You are crazy...\n");
597 /* Load code page table */
598 if (spareblock->n_code_pages)
599 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, spareblock->code_page_dir)))
600 printk("HPFS: Warning: code page support is disabled\n");
606 root = iget_locked(s, sbi->sb_root);
609 hpfs_init_inode(root);
610 hpfs_read_inode(root);
611 unlock_new_inode(root);
612 s->s_root = d_alloc_root(root);
617 hpfs_set_dentry_operations(s->s_root);
620 * find the root directory's . pointer & finish filling in the inode
623 root_dno = hpfs_fnode_dno(s, sbi->sb_root);
625 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
627 hpfs_error(s, "unable to find root dir");
629 root->i_atime.tv_sec = local_to_gmt(s, de->read_date);
630 root->i_atime.tv_nsec = 0;
631 root->i_mtime.tv_sec = local_to_gmt(s, de->write_date);
632 root->i_mtime.tv_nsec = 0;
633 root->i_ctime.tv_sec = local_to_gmt(s, de->creation_date);
634 root->i_ctime.tv_nsec = 0;
635 hpfs_i(root)->i_ea_size = de->ea_size;
636 hpfs_i(root)->i_parent_dir = root->i_ino;
637 if (root->i_size == -1)
639 if (root->i_blocks == -1)
650 kfree(sbi->sb_bmp_dir);
651 kfree(sbi->sb_cp_table);
657 static int hpfs_get_sb(struct file_system_type *fs_type,
658 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
660 return get_sb_bdev(fs_type, flags, dev_name, data, hpfs_fill_super,
664 static struct file_system_type hpfs_fs_type = {
665 .owner = THIS_MODULE,
667 .get_sb = hpfs_get_sb,
668 .kill_sb = kill_block_super,
669 .fs_flags = FS_REQUIRES_DEV,
672 static int __init init_hpfs_fs(void)
674 int err = init_inodecache();
677 err = register_filesystem(&hpfs_fs_type);
682 destroy_inodecache();
687 static void __exit exit_hpfs_fs(void)
689 unregister_filesystem(&hpfs_fs_type);
690 destroy_inodecache();
693 module_init(init_hpfs_fs)
694 module_exit(exit_hpfs_fs)
695 MODULE_LICENSE("GPL");