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>
17 /* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */
19 static void mark_dirty(struct super_block *s)
21 if (hpfs_sb(s)->sb_chkdsk && !(s->s_flags & MS_RDONLY)) {
22 struct buffer_head *bh;
23 struct hpfs_spare_block *sb;
24 if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
27 mark_buffer_dirty(bh);
33 /* Mark the filesystem clean (mark it dirty for chkdsk if chkdsk==2 or if there
36 static void unmark_dirty(struct super_block *s)
38 struct buffer_head *bh;
39 struct hpfs_spare_block *sb;
40 if (s->s_flags & MS_RDONLY) return;
41 if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
42 sb->dirty = hpfs_sb(s)->sb_chkdsk > 1 - hpfs_sb(s)->sb_was_error;
43 sb->old_wrote = hpfs_sb(s)->sb_chkdsk >= 2 && !hpfs_sb(s)->sb_was_error;
44 mark_buffer_dirty(bh);
49 /* Filesystem error... */
50 static char err_buf[1024];
52 void hpfs_error(struct super_block *s, const char *fmt, ...)
57 vsnprintf(err_buf, sizeof(err_buf), fmt, args);
60 printk("HPFS: filesystem error: %s", err_buf);
61 if (!hpfs_sb(s)->sb_was_error) {
62 if (hpfs_sb(s)->sb_err == 2) {
63 printk("; crashing the system because you wanted it\n");
66 } else if (hpfs_sb(s)->sb_err == 1) {
67 if (s->s_flags & MS_RDONLY) printk("; already mounted read-only\n");
69 printk("; remounting read-only\n");
71 s->s_flags |= MS_RDONLY;
73 } else if (s->s_flags & MS_RDONLY) printk("; going on - but anything won't be destroyed because it's read-only\n");
74 else printk("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n");
76 hpfs_sb(s)->sb_was_error = 1;
80 * A little trick to detect cycles in many hpfs structures and don't let the
81 * kernel crash on corrupted filesystem. When first called, set c2 to 0.
83 * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories
84 * nested each in other, chkdsk locked up happilly.
87 int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2,
90 if (*c2 && *c1 == key) {
91 hpfs_error(s, "cycle detected on key %08x in %s", key, msg);
95 if (!((*c2 - 1) & *c2)) *c1 = key;
99 static void hpfs_put_super(struct super_block *s)
101 struct hpfs_sb_info *sbi = hpfs_sb(s);
105 kfree(sbi->sb_cp_table);
106 kfree(sbi->sb_bmp_dir);
114 unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
116 struct quad_buffer_head qbh;
119 if (!(bits = hpfs_map_4sectors(s, secno, &qbh, 4))) return 0;
121 for (i = 0; i < 2048 / sizeof(unsigned); i++) {
123 if (!bits[i]) continue;
124 for (b = bits[i]; b; b>>=1) count += b & 1;
130 static unsigned count_bitmaps(struct super_block *s)
132 unsigned n, count, n_bands;
133 n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14;
135 for (n = 0; n < n_bands; n++)
136 count += hpfs_count_one_bitmap(s, hpfs_sb(s)->sb_bmp_dir[n]);
140 static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf)
142 struct super_block *s = dentry->d_sb;
143 struct hpfs_sb_info *sbi = hpfs_sb(s);
144 u64 id = huge_encode_dev(s->s_bdev->bd_dev);
147 /*if (sbi->sb_n_free == -1) {*/
148 sbi->sb_n_free = count_bitmaps(s);
149 sbi->sb_n_free_dnodes = hpfs_count_one_bitmap(s, sbi->sb_dmap);
151 buf->f_type = s->s_magic;
153 buf->f_blocks = sbi->sb_fs_size;
154 buf->f_bfree = sbi->sb_n_free;
155 buf->f_bavail = sbi->sb_n_free;
156 buf->f_files = sbi->sb_dirband_size / 4;
157 buf->f_ffree = sbi->sb_n_free_dnodes;
158 buf->f_fsid.val[0] = (u32)id;
159 buf->f_fsid.val[1] = (u32)(id >> 32);
160 buf->f_namelen = 254;
167 static struct kmem_cache * hpfs_inode_cachep;
169 static struct inode *hpfs_alloc_inode(struct super_block *sb)
171 struct hpfs_inode_info *ei;
172 ei = (struct hpfs_inode_info *)kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS);
175 ei->vfs_inode.i_version = 1;
176 return &ei->vfs_inode;
179 static void hpfs_destroy_inode(struct inode *inode)
181 kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
184 static void init_once(void *foo)
186 struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;
188 mutex_init(&ei->i_mutex);
189 mutex_init(&ei->i_parent_mutex);
190 inode_init_once(&ei->vfs_inode);
193 static int init_inodecache(void)
195 hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache",
196 sizeof(struct hpfs_inode_info),
197 0, (SLAB_RECLAIM_ACCOUNT|
200 if (hpfs_inode_cachep == NULL)
205 static void destroy_inodecache(void)
207 kmem_cache_destroy(hpfs_inode_cachep);
211 * A tiny parser for option strings, stolen from dosfs.
212 * Stolen again from read-only hpfs.
213 * And updated for table-driven option parsing.
217 Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis,
218 Opt_conv_binary, Opt_conv_text, Opt_conv_auto,
219 Opt_check_none, Opt_check_normal, Opt_check_strict,
220 Opt_err_cont, Opt_err_ro, Opt_err_panic,
221 Opt_eas_no, Opt_eas_ro, Opt_eas_rw,
222 Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always,
223 Opt_timeshift, Opt_err,
226 static const match_table_t tokens = {
230 {Opt_umask, "umask=%o"},
231 {Opt_case_lower, "case=lower"},
232 {Opt_case_asis, "case=asis"},
233 {Opt_conv_binary, "conv=binary"},
234 {Opt_conv_text, "conv=text"},
235 {Opt_conv_auto, "conv=auto"},
236 {Opt_check_none, "check=none"},
237 {Opt_check_normal, "check=normal"},
238 {Opt_check_strict, "check=strict"},
239 {Opt_err_cont, "errors=continue"},
240 {Opt_err_ro, "errors=remount-ro"},
241 {Opt_err_panic, "errors=panic"},
242 {Opt_eas_no, "eas=no"},
243 {Opt_eas_ro, "eas=ro"},
244 {Opt_eas_rw, "eas=rw"},
245 {Opt_chkdsk_no, "chkdsk=no"},
246 {Opt_chkdsk_errors, "chkdsk=errors"},
247 {Opt_chkdsk_always, "chkdsk=always"},
248 {Opt_timeshift, "timeshift=%d"},
252 static int parse_opts(char *opts, uid_t *uid, gid_t *gid, umode_t *umask,
253 int *lowercase, int *conv, int *eas, int *chk, int *errs,
254 int *chkdsk, int *timeshift)
262 /*printk("Parsing opts: '%s'\n",opts);*/
264 while ((p = strsep(&opts, ",")) != NULL) {
265 substring_t args[MAX_OPT_ARGS];
270 token = match_token(p, tokens, args);
275 if (match_int(args, &option))
280 if (match_int(args, &option))
285 if (match_octal(args, &option))
295 case Opt_conv_binary:
307 case Opt_check_normal:
310 case Opt_check_strict:
334 case Opt_chkdsk_errors:
337 case Opt_chkdsk_always:
343 char *rhs = args[0].from;
346 if (*rhs == '-') m = -1;
347 if (*rhs == '+' || *rhs == '-') rhs++;
348 *timeshift = simple_strtoul(rhs, &rhs, 0) * m;
360 static inline void hpfs_help(void)
363 HPFS filesystem options:\n\
364 help do not mount and display this text\n\
365 uid=xxx set uid of files that don't have uid specified in eas\n\
366 gid=xxx set gid of files that don't have gid specified in eas\n\
367 umask=xxx set mode of files that don't have mode specified in eas\n\
368 case=lower lowercase all files\n\
369 case=asis do not lowercase files (default)\n\
370 conv=binary do not convert CR/LF -> LF (default)\n\
371 conv=auto convert only files with known text extensions\n\
372 conv=text convert all files\n\
373 check=none no fs checks - kernel may crash on corrupted filesystem\n\
374 check=normal do some checks - it should not crash (default)\n\
375 check=strict do extra time-consuming checks, used for debugging\n\
376 errors=continue continue on errors\n\
377 errors=remount-ro remount read-only if errors found (default)\n\
378 errors=panic panic on errors\n\
379 chkdsk=no do not mark fs for chkdsking even if there were errors\n\
380 chkdsk=errors mark fs dirty if errors found (default)\n\
381 chkdsk=always always mark fs dirty - used for debugging\n\
382 eas=no ignore extended attributes\n\
383 eas=ro read but do not write extended attributes\n\
384 eas=rw r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
385 timeshift=nnn add nnn seconds to file times\n\
389 static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
394 int lowercase, conv, eas, chk, errs, chkdsk, timeshift;
396 struct hpfs_sb_info *sbi = hpfs_sb(s);
397 char *new_opts = kstrdup(data, GFP_KERNEL);
399 *flags |= MS_NOATIME;
402 uid = sbi->sb_uid; gid = sbi->sb_gid;
403 umask = 0777 & ~sbi->sb_mode;
404 lowercase = sbi->sb_lowercase; conv = sbi->sb_conv;
405 eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk;
406 errs = sbi->sb_err; timeshift = sbi->sb_timeshift;
408 if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase, &conv,
409 &eas, &chk, &errs, &chkdsk, ×hift))) {
410 printk("HPFS: bad mount options.\n");
417 if (timeshift != sbi->sb_timeshift) {
418 printk("HPFS: timeshift can't be changed using remount.\n");
424 sbi->sb_uid = uid; sbi->sb_gid = gid;
425 sbi->sb_mode = 0777 & ~umask;
426 sbi->sb_lowercase = lowercase; sbi->sb_conv = conv;
427 sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk;
428 sbi->sb_err = errs; sbi->sb_timeshift = timeshift;
430 if (!(*flags & MS_RDONLY)) mark_dirty(s);
432 replace_mount_options(s, new_opts);
443 /* Super operations */
445 static const struct super_operations hpfs_sops =
447 .alloc_inode = hpfs_alloc_inode,
448 .destroy_inode = hpfs_destroy_inode,
449 .delete_inode = hpfs_delete_inode,
450 .put_super = hpfs_put_super,
451 .statfs = hpfs_statfs,
452 .remount_fs = hpfs_remount_fs,
453 .show_options = generic_show_options,
456 static int hpfs_fill_super(struct super_block *s, void *options, int silent)
458 struct buffer_head *bh0, *bh1, *bh2;
459 struct hpfs_boot_block *bootblock;
460 struct hpfs_super_block *superblock;
461 struct hpfs_spare_block *spareblock;
462 struct hpfs_sb_info *sbi;
468 int lowercase, conv, eas, chk, errs, chkdsk, timeshift;
470 dnode_secno root_dno;
471 struct hpfs_dirent *de = NULL;
472 struct quad_buffer_head qbh;
476 save_mount_options(s, options);
478 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
483 sbi->sb_bmp_dir = NULL;
484 sbi->sb_cp_table = NULL;
486 init_MUTEX(&sbi->hpfs_creation_de);
490 umask = current_umask();
499 if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase, &conv,
500 &eas, &chk, &errs, &chkdsk, ×hift))) {
501 printk("HPFS: bad mount options.\n");
509 /*sbi->sb_mounting = 1;*/
510 sb_set_blocksize(s, 512);
511 sbi->sb_fs_size = -1;
512 if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
513 if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
514 if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;
517 if (/*bootblock->magic != BB_MAGIC
518 ||*/ superblock->magic != SB_MAGIC
519 || spareblock->magic != SP_MAGIC) {
520 if (!silent) printk("HPFS: Bad magic ... probably not HPFS\n");
525 if (!(s->s_flags & MS_RDONLY) &&
526 superblock->funcversion != 2 && superblock->funcversion != 3) {
527 printk("HPFS: Bad version %d,%d. Mount readonly to go around\n",
528 (int)superblock->version, (int)superblock->funcversion);
529 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");
533 s->s_flags |= MS_NOATIME;
535 /* Fill superblock stuff */
536 s->s_magic = HPFS_SUPER_MAGIC;
537 s->s_op = &hpfs_sops;
539 sbi->sb_root = superblock->root;
540 sbi->sb_fs_size = superblock->n_sectors;
541 sbi->sb_bitmaps = superblock->bitmaps;
542 sbi->sb_dirband_start = superblock->dir_band_start;
543 sbi->sb_dirband_size = superblock->n_dir_band;
544 sbi->sb_dmap = superblock->dir_band_bitmap;
547 sbi->sb_mode = 0777 & ~umask;
549 sbi->sb_n_free_dnodes = -1;
550 sbi->sb_lowercase = lowercase;
554 sbi->sb_chkdsk = chkdsk;
556 sbi->sb_timeshift = timeshift;
557 sbi->sb_was_error = 0;
558 sbi->sb_cp_table = NULL;
559 sbi->sb_c_bitmap = -1;
560 sbi->sb_max_fwd_alloc = 0xffffff;
562 /* Load bitmap directory */
563 if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, superblock->bitmaps)))
566 /* Check for general fs errors*/
567 if (spareblock->dirty && !spareblock->old_wrote) {
569 printk("HPFS: Improperly stopped, not mounted\n");
572 hpfs_error(s, "improperly stopped");
575 if (!(s->s_flags & MS_RDONLY)) {
576 spareblock->dirty = 1;
577 spareblock->old_wrote = 0;
578 mark_buffer_dirty(bh2);
581 if (spareblock->hotfixes_used || spareblock->n_spares_used) {
583 printk("HPFS: Hotfixes not supported here, try chkdsk\n");
587 hpfs_error(s, "hotfixes not supported here, try chkdsk");
588 if (errs == 0) printk("HPFS: Proceeding, but your filesystem will be probably corrupted by this driver...\n");
589 else printk("HPFS: This driver may read bad files or crash when operating on disk with hotfixes.\n");
591 if (spareblock->n_dnode_spares != spareblock->n_dnode_spares_free) {
593 printk("HPFS: Spare dnodes used, try chkdsk\n");
597 hpfs_error(s, "warning: spare dnodes used, try chkdsk");
598 if (errs == 0) printk("HPFS: Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
602 if (superblock->dir_band_end - superblock->dir_band_start + 1 != superblock->n_dir_band ||
603 superblock->dir_band_end < superblock->dir_band_start || superblock->n_dir_band > 0x4000) {
604 hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
605 superblock->dir_band_start, superblock->dir_band_end, superblock->n_dir_band);
608 a = sbi->sb_dirband_size;
609 sbi->sb_dirband_size = 0;
610 if (hpfs_chk_sectors(s, superblock->dir_band_start, superblock->n_dir_band, "dir_band") ||
611 hpfs_chk_sectors(s, superblock->dir_band_bitmap, 4, "dir_band_bitmap") ||
612 hpfs_chk_sectors(s, superblock->bitmaps, 4, "bitmaps")) {
616 sbi->sb_dirband_size = a;
617 } else printk("HPFS: You really don't want any checks? You are crazy...\n");
619 /* Load code page table */
620 if (spareblock->n_code_pages)
621 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, spareblock->code_page_dir)))
622 printk("HPFS: Warning: code page support is disabled\n");
628 root = iget_locked(s, sbi->sb_root);
631 hpfs_init_inode(root);
632 hpfs_read_inode(root);
633 unlock_new_inode(root);
634 s->s_root = d_alloc_root(root);
639 hpfs_set_dentry_operations(s->s_root);
642 * find the root directory's . pointer & finish filling in the inode
645 root_dno = hpfs_fnode_dno(s, sbi->sb_root);
647 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
649 hpfs_error(s, "unable to find root dir");
651 root->i_atime.tv_sec = local_to_gmt(s, de->read_date);
652 root->i_atime.tv_nsec = 0;
653 root->i_mtime.tv_sec = local_to_gmt(s, de->write_date);
654 root->i_mtime.tv_nsec = 0;
655 root->i_ctime.tv_sec = local_to_gmt(s, de->creation_date);
656 root->i_ctime.tv_nsec = 0;
657 hpfs_i(root)->i_ea_size = de->ea_size;
658 hpfs_i(root)->i_parent_dir = root->i_ino;
659 if (root->i_size == -1)
661 if (root->i_blocks == -1)
672 kfree(sbi->sb_bmp_dir);
673 kfree(sbi->sb_cp_table);
679 static int hpfs_get_sb(struct file_system_type *fs_type,
680 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
682 return get_sb_bdev(fs_type, flags, dev_name, data, hpfs_fill_super,
686 static struct file_system_type hpfs_fs_type = {
687 .owner = THIS_MODULE,
689 .get_sb = hpfs_get_sb,
690 .kill_sb = kill_block_super,
691 .fs_flags = FS_REQUIRES_DEV,
694 static int __init init_hpfs_fs(void)
696 int err = init_inodecache();
699 err = register_filesystem(&hpfs_fs_type);
704 destroy_inodecache();
709 static void __exit exit_hpfs_fs(void)
711 unregister_filesystem(&hpfs_fs_type);
712 destroy_inodecache();
715 module_init(init_hpfs_fs)
716 module_exit(exit_hpfs_fs)
717 MODULE_LICENSE("GPL");