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 const 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");