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 void hpfs_error(struct super_block *s, const char *fmt, ...)
65 pr_err("filesystem error: %pV", &vaf);
69 if (!hpfs_sb(s)->sb_was_error) {
70 if (hpfs_sb(s)->sb_err == 2) {
71 pr_cont("; crashing the system because you wanted it\n");
74 } else if (hpfs_sb(s)->sb_err == 1) {
75 if (s->s_flags & MS_RDONLY)
76 pr_cont("; already mounted read-only\n");
78 pr_cont("; remounting read-only\n");
80 s->s_flags |= MS_RDONLY;
82 } else if (s->s_flags & MS_RDONLY)
83 pr_cont("; going on - but anything won't be destroyed because it's read-only\n");
85 pr_cont("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n");
88 hpfs_sb(s)->sb_was_error = 1;
92 * A little trick to detect cycles in many hpfs structures and don't let the
93 * kernel crash on corrupted filesystem. When first called, set c2 to 0.
95 * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories
96 * nested each in other, chkdsk locked up happilly.
99 int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2,
102 if (*c2 && *c1 == key) {
103 hpfs_error(s, "cycle detected on key %08x in %s", key, msg);
107 if (!((*c2 - 1) & *c2)) *c1 = key;
111 static void free_sbi(struct hpfs_sb_info *sbi)
113 kfree(sbi->sb_cp_table);
114 kfree(sbi->sb_bmp_dir);
118 static void lazy_free_sbi(struct rcu_head *rcu)
120 free_sbi(container_of(rcu, struct hpfs_sb_info, rcu));
123 static void hpfs_put_super(struct super_block *s)
128 call_rcu(&hpfs_sb(s)->rcu, lazy_free_sbi);
131 static unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
133 struct quad_buffer_head qbh;
137 bits = hpfs_map_4sectors(s, secno, &qbh, 0);
140 count = bitmap_weight(bits, 2048 * BITS_PER_BYTE);
145 static unsigned count_bitmaps(struct super_block *s)
147 unsigned n, count, n_bands;
148 n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14;
150 for (n = 0; n < COUNT_RD_AHEAD; n++) {
151 hpfs_prefetch_bitmap(s, n);
153 for (n = 0; n < n_bands; n++) {
155 hpfs_prefetch_bitmap(s, n + COUNT_RD_AHEAD);
156 c = hpfs_count_one_bitmap(s, le32_to_cpu(hpfs_sb(s)->sb_bmp_dir[n]));
157 if (c != (unsigned)-1)
163 unsigned hpfs_get_free_dnodes(struct super_block *s)
165 struct hpfs_sb_info *sbi = hpfs_sb(s);
166 if (sbi->sb_n_free_dnodes == (unsigned)-1) {
167 unsigned c = hpfs_count_one_bitmap(s, sbi->sb_dmap);
168 if (c == (unsigned)-1)
170 sbi->sb_n_free_dnodes = c;
172 return sbi->sb_n_free_dnodes;
175 static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf)
177 struct super_block *s = dentry->d_sb;
178 struct hpfs_sb_info *sbi = hpfs_sb(s);
179 u64 id = huge_encode_dev(s->s_bdev->bd_dev);
183 if (sbi->sb_n_free == (unsigned)-1)
184 sbi->sb_n_free = count_bitmaps(s);
186 buf->f_type = s->s_magic;
188 buf->f_blocks = sbi->sb_fs_size;
189 buf->f_bfree = sbi->sb_n_free;
190 buf->f_bavail = sbi->sb_n_free;
191 buf->f_files = sbi->sb_dirband_size / 4;
192 buf->f_ffree = hpfs_get_free_dnodes(s);
193 buf->f_fsid.val[0] = (u32)id;
194 buf->f_fsid.val[1] = (u32)(id >> 32);
195 buf->f_namelen = 254;
202 static struct kmem_cache * hpfs_inode_cachep;
204 static struct inode *hpfs_alloc_inode(struct super_block *sb)
206 struct hpfs_inode_info *ei;
207 ei = (struct hpfs_inode_info *)kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS);
210 ei->vfs_inode.i_version = 1;
211 return &ei->vfs_inode;
214 static void hpfs_i_callback(struct rcu_head *head)
216 struct inode *inode = container_of(head, struct inode, i_rcu);
217 kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
220 static void hpfs_destroy_inode(struct inode *inode)
222 call_rcu(&inode->i_rcu, hpfs_i_callback);
225 static void init_once(void *foo)
227 struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;
229 inode_init_once(&ei->vfs_inode);
232 static int init_inodecache(void)
234 hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache",
235 sizeof(struct hpfs_inode_info),
236 0, (SLAB_RECLAIM_ACCOUNT|
239 if (hpfs_inode_cachep == NULL)
244 static void destroy_inodecache(void)
247 * Make sure all delayed rcu free inodes are flushed before we
251 kmem_cache_destroy(hpfs_inode_cachep);
255 * A tiny parser for option strings, stolen from dosfs.
256 * Stolen again from read-only hpfs.
257 * And updated for table-driven option parsing.
261 Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis,
262 Opt_check_none, Opt_check_normal, Opt_check_strict,
263 Opt_err_cont, Opt_err_ro, Opt_err_panic,
264 Opt_eas_no, Opt_eas_ro, Opt_eas_rw,
265 Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always,
266 Opt_timeshift, Opt_err,
269 static const match_table_t tokens = {
273 {Opt_umask, "umask=%o"},
274 {Opt_case_lower, "case=lower"},
275 {Opt_case_asis, "case=asis"},
276 {Opt_check_none, "check=none"},
277 {Opt_check_normal, "check=normal"},
278 {Opt_check_strict, "check=strict"},
279 {Opt_err_cont, "errors=continue"},
280 {Opt_err_ro, "errors=remount-ro"},
281 {Opt_err_panic, "errors=panic"},
282 {Opt_eas_no, "eas=no"},
283 {Opt_eas_ro, "eas=ro"},
284 {Opt_eas_rw, "eas=rw"},
285 {Opt_chkdsk_no, "chkdsk=no"},
286 {Opt_chkdsk_errors, "chkdsk=errors"},
287 {Opt_chkdsk_always, "chkdsk=always"},
288 {Opt_timeshift, "timeshift=%d"},
292 static int parse_opts(char *opts, kuid_t *uid, kgid_t *gid, umode_t *umask,
293 int *lowercase, int *eas, int *chk, int *errs,
294 int *chkdsk, int *timeshift)
302 /*pr_info("Parsing opts: '%s'\n",opts);*/
304 while ((p = strsep(&opts, ",")) != NULL) {
305 substring_t args[MAX_OPT_ARGS];
310 token = match_token(p, tokens, args);
315 if (match_int(args, &option))
317 *uid = make_kuid(current_user_ns(), option);
318 if (!uid_valid(*uid))
322 if (match_int(args, &option))
324 *gid = make_kgid(current_user_ns(), option);
325 if (!gid_valid(*gid))
329 if (match_octal(args, &option))
342 case Opt_check_normal:
345 case Opt_check_strict:
369 case Opt_chkdsk_errors:
372 case Opt_chkdsk_always:
378 char *rhs = args[0].from;
381 if (*rhs == '-') m = -1;
382 if (*rhs == '+' || *rhs == '-') rhs++;
383 *timeshift = simple_strtoul(rhs, &rhs, 0) * m;
395 static inline void hpfs_help(void)
398 HPFS filesystem options:\n\
399 help do not mount and display this text\n\
400 uid=xxx set uid of files that don't have uid specified in eas\n\
401 gid=xxx set gid of files that don't have gid specified in eas\n\
402 umask=xxx set mode of files that don't have mode specified in eas\n\
403 case=lower lowercase all files\n\
404 case=asis do not lowercase files (default)\n\
405 check=none no fs checks - kernel may crash on corrupted filesystem\n\
406 check=normal do some checks - it should not crash (default)\n\
407 check=strict do extra time-consuming checks, used for debugging\n\
408 errors=continue continue on errors\n\
409 errors=remount-ro remount read-only if errors found (default)\n\
410 errors=panic panic on errors\n\
411 chkdsk=no do not mark fs for chkdsking even if there were errors\n\
412 chkdsk=errors mark fs dirty if errors found (default)\n\
413 chkdsk=always always mark fs dirty - used for debugging\n\
414 eas=no ignore extended attributes\n\
415 eas=ro read but do not write extended attributes\n\
416 eas=rw r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
417 timeshift=nnn add nnn seconds to file times\n\
421 static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
426 int lowercase, eas, chk, errs, chkdsk, timeshift;
428 struct hpfs_sb_info *sbi = hpfs_sb(s);
429 char *new_opts = kstrdup(data, GFP_KERNEL);
436 *flags |= MS_NOATIME;
439 uid = sbi->sb_uid; gid = sbi->sb_gid;
440 umask = 0777 & ~sbi->sb_mode;
441 lowercase = sbi->sb_lowercase;
442 eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk;
443 errs = sbi->sb_err; timeshift = sbi->sb_timeshift;
445 if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase,
446 &eas, &chk, &errs, &chkdsk, ×hift))) {
447 pr_err("bad mount options.\n");
454 if (timeshift != sbi->sb_timeshift) {
455 pr_err("timeshift can't be changed using remount.\n");
461 sbi->sb_uid = uid; sbi->sb_gid = gid;
462 sbi->sb_mode = 0777 & ~umask;
463 sbi->sb_lowercase = lowercase;
464 sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk;
465 sbi->sb_err = errs; sbi->sb_timeshift = timeshift;
467 if (!(*flags & MS_RDONLY)) mark_dirty(s, 1);
469 replace_mount_options(s, new_opts);
480 /* Super operations */
482 static const struct super_operations hpfs_sops =
484 .alloc_inode = hpfs_alloc_inode,
485 .destroy_inode = hpfs_destroy_inode,
486 .evict_inode = hpfs_evict_inode,
487 .put_super = hpfs_put_super,
488 .statfs = hpfs_statfs,
489 .remount_fs = hpfs_remount_fs,
490 .show_options = generic_show_options,
493 static int hpfs_fill_super(struct super_block *s, void *options, int silent)
495 struct buffer_head *bh0, *bh1, *bh2;
496 struct hpfs_boot_block *bootblock;
497 struct hpfs_super_block *superblock;
498 struct hpfs_spare_block *spareblock;
499 struct hpfs_sb_info *sbi;
505 int lowercase, eas, chk, errs, chkdsk, timeshift;
507 dnode_secno root_dno;
508 struct hpfs_dirent *de = NULL;
509 struct quad_buffer_head qbh;
513 save_mount_options(s, options);
515 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
521 mutex_init(&sbi->hpfs_mutex);
526 umask = current_umask();
534 if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase,
535 &eas, &chk, &errs, &chkdsk, ×hift))) {
536 pr_err("bad mount options.\n");
544 /*sbi->sb_mounting = 1;*/
545 sb_set_blocksize(s, 512);
546 sbi->sb_fs_size = -1;
547 if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
548 if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
549 if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;
552 if (/*le16_to_cpu(bootblock->magic) != BB_MAGIC
553 ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC
554 || le32_to_cpu(spareblock->magic) != SP_MAGIC) {
556 pr_err("Bad magic ... probably not HPFS\n");
561 if (!(s->s_flags & MS_RDONLY) &&
562 superblock->funcversion != 2 && superblock->funcversion != 3) {
563 pr_err("Bad version %d,%d. Mount readonly to go around\n",
564 (int)superblock->version, (int)superblock->funcversion);
565 pr_err("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");
569 s->s_flags |= MS_NOATIME;
571 /* Fill superblock stuff */
572 s->s_magic = HPFS_SUPER_MAGIC;
573 s->s_op = &hpfs_sops;
574 s->s_d_op = &hpfs_dentry_operations;
576 sbi->sb_root = le32_to_cpu(superblock->root);
577 sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors);
578 sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps);
579 sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start);
580 sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band);
581 sbi->sb_dmap = le32_to_cpu(superblock->dir_band_bitmap);
584 sbi->sb_mode = 0777 & ~umask;
586 sbi->sb_n_free_dnodes = -1;
587 sbi->sb_lowercase = lowercase;
590 sbi->sb_chkdsk = chkdsk;
592 sbi->sb_timeshift = timeshift;
593 sbi->sb_was_error = 0;
594 sbi->sb_cp_table = NULL;
595 sbi->sb_c_bitmap = -1;
596 sbi->sb_max_fwd_alloc = 0xffffff;
598 if (sbi->sb_fs_size >= 0x80000000) {
599 hpfs_error(s, "invalid size in superblock: %08x",
600 (unsigned)sbi->sb_fs_size);
604 /* Load bitmap directory */
605 if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps))))
608 /* Check for general fs errors*/
609 if (spareblock->dirty && !spareblock->old_wrote) {
611 pr_err("Improperly stopped, not mounted\n");
614 hpfs_error(s, "improperly stopped");
617 if (!(s->s_flags & MS_RDONLY)) {
618 spareblock->dirty = 1;
619 spareblock->old_wrote = 0;
620 mark_buffer_dirty(bh2);
623 if (spareblock->hotfixes_used || spareblock->n_spares_used) {
625 pr_err("Hotfixes not supported here, try chkdsk\n");
629 hpfs_error(s, "hotfixes not supported here, try chkdsk");
631 pr_err("Proceeding, but your filesystem will be probably corrupted by this driver...\n");
633 pr_err("This driver may read bad files or crash when operating on disk with hotfixes.\n");
635 if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) {
637 pr_err("Spare dnodes used, try chkdsk\n");
641 hpfs_error(s, "warning: spare dnodes used, try chkdsk");
643 pr_err("Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
647 if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) ||
648 le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) {
649 hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
650 le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band));
653 a = sbi->sb_dirband_size;
654 sbi->sb_dirband_size = 0;
655 if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") ||
656 hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") ||
657 hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) {
661 sbi->sb_dirband_size = a;
663 pr_err("You really don't want any checks? You are crazy...\n");
665 /* Load code page table */
666 if (le32_to_cpu(spareblock->n_code_pages))
667 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir))))
668 pr_err("code page support is disabled\n");
674 root = iget_locked(s, sbi->sb_root);
677 hpfs_init_inode(root);
678 hpfs_read_inode(root);
679 unlock_new_inode(root);
680 s->s_root = d_make_root(root);
685 * find the root directory's . pointer & finish filling in the inode
688 root_dno = hpfs_fnode_dno(s, sbi->sb_root);
690 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
692 hpfs_error(s, "unable to find root dir");
694 root->i_atime.tv_sec = local_to_gmt(s, le32_to_cpu(de->read_date));
695 root->i_atime.tv_nsec = 0;
696 root->i_mtime.tv_sec = local_to_gmt(s, le32_to_cpu(de->write_date));
697 root->i_mtime.tv_nsec = 0;
698 root->i_ctime.tv_sec = local_to_gmt(s, le32_to_cpu(de->creation_date));
699 root->i_ctime.tv_nsec = 0;
700 hpfs_i(root)->i_ea_size = le32_to_cpu(de->ea_size);
701 hpfs_i(root)->i_parent_dir = root->i_ino;
702 if (root->i_size == -1)
704 if (root->i_blocks == -1)
721 static struct dentry *hpfs_mount(struct file_system_type *fs_type,
722 int flags, const char *dev_name, void *data)
724 return mount_bdev(fs_type, flags, dev_name, data, hpfs_fill_super);
727 static struct file_system_type hpfs_fs_type = {
728 .owner = THIS_MODULE,
731 .kill_sb = kill_block_super,
732 .fs_flags = FS_REQUIRES_DEV,
734 MODULE_ALIAS_FS("hpfs");
736 static int __init init_hpfs_fs(void)
738 int err = init_inodecache();
741 err = register_filesystem(&hpfs_fs_type);
746 destroy_inodecache();
751 static void __exit exit_hpfs_fs(void)
753 unregister_filesystem(&hpfs_fs_type);
754 destroy_inodecache();
757 module_init(init_hpfs_fs)
758 module_exit(exit_hpfs_fs)
759 MODULE_LICENSE("GPL");