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)
23 if (hpfs_sb(s)->sb_chkdsk && !(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);
35 /* Mark the filesystem clean (mark it dirty for chkdsk if chkdsk==2 or if there
38 static void unmark_dirty(struct super_block *s)
40 struct buffer_head *bh;
41 struct hpfs_spare_block *sb;
42 if (s->s_flags & MS_RDONLY) return;
43 if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
44 sb->dirty = hpfs_sb(s)->sb_chkdsk > 1 - hpfs_sb(s)->sb_was_error;
45 sb->old_wrote = hpfs_sb(s)->sb_chkdsk >= 2 && !hpfs_sb(s)->sb_was_error;
46 mark_buffer_dirty(bh);
51 /* Filesystem error... */
52 static char err_buf[1024];
54 void hpfs_error(struct super_block *s, const char *fmt, ...)
59 vsnprintf(err_buf, sizeof(err_buf), fmt, args);
62 printk("HPFS: filesystem error: %s", err_buf);
63 if (!hpfs_sb(s)->sb_was_error) {
64 if (hpfs_sb(s)->sb_err == 2) {
65 printk("; crashing the system because you wanted it\n");
68 } else if (hpfs_sb(s)->sb_err == 1) {
69 if (s->s_flags & MS_RDONLY) printk("; already mounted read-only\n");
71 printk("; remounting read-only\n");
73 s->s_flags |= MS_RDONLY;
75 } else if (s->s_flags & MS_RDONLY) printk("; going on - but anything won't be destroyed because it's read-only\n");
76 else printk("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n");
78 hpfs_sb(s)->sb_was_error = 1;
82 * A little trick to detect cycles in many hpfs structures and don't let the
83 * kernel crash on corrupted filesystem. When first called, set c2 to 0.
85 * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories
86 * nested each in other, chkdsk locked up happilly.
89 int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2,
92 if (*c2 && *c1 == key) {
93 hpfs_error(s, "cycle detected on key %08x in %s", key, msg);
97 if (!((*c2 - 1) & *c2)) *c1 = key;
101 static void hpfs_put_super(struct super_block *s)
103 struct hpfs_sb_info *sbi = hpfs_sb(s);
109 kfree(sbi->sb_cp_table);
110 kfree(sbi->sb_bmp_dir);
115 unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
117 struct quad_buffer_head qbh;
121 bits = hpfs_map_4sectors(s, secno, &qbh, 4);
124 count = bitmap_weight(bits, 2048 * BITS_PER_BYTE);
129 static unsigned count_bitmaps(struct super_block *s)
131 unsigned n, count, n_bands;
132 n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14;
134 for (n = 0; n < n_bands; n++)
135 count += hpfs_count_one_bitmap(s, hpfs_sb(s)->sb_bmp_dir[n]);
139 static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf)
141 struct super_block *s = dentry->d_sb;
142 struct hpfs_sb_info *sbi = hpfs_sb(s);
143 u64 id = huge_encode_dev(s->s_bdev->bd_dev);
146 /*if (sbi->sb_n_free == -1) {*/
147 sbi->sb_n_free = count_bitmaps(s);
148 sbi->sb_n_free_dnodes = hpfs_count_one_bitmap(s, sbi->sb_dmap);
150 buf->f_type = s->s_magic;
152 buf->f_blocks = sbi->sb_fs_size;
153 buf->f_bfree = sbi->sb_n_free;
154 buf->f_bavail = sbi->sb_n_free;
155 buf->f_files = sbi->sb_dirband_size / 4;
156 buf->f_ffree = sbi->sb_n_free_dnodes;
157 buf->f_fsid.val[0] = (u32)id;
158 buf->f_fsid.val[1] = (u32)(id >> 32);
159 buf->f_namelen = 254;
166 static struct kmem_cache * hpfs_inode_cachep;
168 static struct inode *hpfs_alloc_inode(struct super_block *sb)
170 struct hpfs_inode_info *ei;
171 ei = (struct hpfs_inode_info *)kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS);
174 ei->vfs_inode.i_version = 1;
175 return &ei->vfs_inode;
178 static void hpfs_i_callback(struct rcu_head *head)
180 struct inode *inode = container_of(head, struct inode, i_rcu);
181 INIT_LIST_HEAD(&inode->i_dentry);
182 kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
185 static void hpfs_destroy_inode(struct inode *inode)
187 call_rcu(&inode->i_rcu, hpfs_i_callback);
190 static void init_once(void *foo)
192 struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;
194 inode_init_once(&ei->vfs_inode);
197 static int init_inodecache(void)
199 hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache",
200 sizeof(struct hpfs_inode_info),
201 0, (SLAB_RECLAIM_ACCOUNT|
204 if (hpfs_inode_cachep == NULL)
209 static void destroy_inodecache(void)
211 kmem_cache_destroy(hpfs_inode_cachep);
215 * A tiny parser for option strings, stolen from dosfs.
216 * Stolen again from read-only hpfs.
217 * And updated for table-driven option parsing.
221 Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis,
222 Opt_conv_binary, Opt_conv_text, Opt_conv_auto,
223 Opt_check_none, Opt_check_normal, Opt_check_strict,
224 Opt_err_cont, Opt_err_ro, Opt_err_panic,
225 Opt_eas_no, Opt_eas_ro, Opt_eas_rw,
226 Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always,
227 Opt_timeshift, Opt_err,
230 static const match_table_t tokens = {
234 {Opt_umask, "umask=%o"},
235 {Opt_case_lower, "case=lower"},
236 {Opt_case_asis, "case=asis"},
237 {Opt_conv_binary, "conv=binary"},
238 {Opt_conv_text, "conv=text"},
239 {Opt_conv_auto, "conv=auto"},
240 {Opt_check_none, "check=none"},
241 {Opt_check_normal, "check=normal"},
242 {Opt_check_strict, "check=strict"},
243 {Opt_err_cont, "errors=continue"},
244 {Opt_err_ro, "errors=remount-ro"},
245 {Opt_err_panic, "errors=panic"},
246 {Opt_eas_no, "eas=no"},
247 {Opt_eas_ro, "eas=ro"},
248 {Opt_eas_rw, "eas=rw"},
249 {Opt_chkdsk_no, "chkdsk=no"},
250 {Opt_chkdsk_errors, "chkdsk=errors"},
251 {Opt_chkdsk_always, "chkdsk=always"},
252 {Opt_timeshift, "timeshift=%d"},
256 static int parse_opts(char *opts, uid_t *uid, gid_t *gid, umode_t *umask,
257 int *lowercase, int *conv, int *eas, int *chk, int *errs,
258 int *chkdsk, int *timeshift)
266 /*printk("Parsing opts: '%s'\n",opts);*/
268 while ((p = strsep(&opts, ",")) != NULL) {
269 substring_t args[MAX_OPT_ARGS];
274 token = match_token(p, tokens, args);
279 if (match_int(args, &option))
284 if (match_int(args, &option))
289 if (match_octal(args, &option))
299 case Opt_conv_binary:
311 case Opt_check_normal:
314 case Opt_check_strict:
338 case Opt_chkdsk_errors:
341 case Opt_chkdsk_always:
347 char *rhs = args[0].from;
350 if (*rhs == '-') m = -1;
351 if (*rhs == '+' || *rhs == '-') rhs++;
352 *timeshift = simple_strtoul(rhs, &rhs, 0) * m;
364 static inline void hpfs_help(void)
367 HPFS filesystem options:\n\
368 help do not mount and display this text\n\
369 uid=xxx set uid of files that don't have uid specified in eas\n\
370 gid=xxx set gid of files that don't have gid specified in eas\n\
371 umask=xxx set mode of files that don't have mode specified in eas\n\
372 case=lower lowercase all files\n\
373 case=asis do not lowercase files (default)\n\
374 conv=binary do not convert CR/LF -> LF (default)\n\
375 conv=auto convert only files with known text extensions\n\
376 conv=text convert all files\n\
377 check=none no fs checks - kernel may crash on corrupted filesystem\n\
378 check=normal do some checks - it should not crash (default)\n\
379 check=strict do extra time-consuming checks, used for debugging\n\
380 errors=continue continue on errors\n\
381 errors=remount-ro remount read-only if errors found (default)\n\
382 errors=panic panic on errors\n\
383 chkdsk=no do not mark fs for chkdsking even if there were errors\n\
384 chkdsk=errors mark fs dirty if errors found (default)\n\
385 chkdsk=always always mark fs dirty - used for debugging\n\
386 eas=no ignore extended attributes\n\
387 eas=ro read but do not write extended attributes\n\
388 eas=rw r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
389 timeshift=nnn add nnn seconds to file times\n\
393 static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
398 int lowercase, conv, eas, chk, errs, chkdsk, timeshift;
400 struct hpfs_sb_info *sbi = hpfs_sb(s);
401 char *new_opts = kstrdup(data, GFP_KERNEL);
403 *flags |= MS_NOATIME;
407 uid = sbi->sb_uid; gid = sbi->sb_gid;
408 umask = 0777 & ~sbi->sb_mode;
409 lowercase = sbi->sb_lowercase; conv = sbi->sb_conv;
410 eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk;
411 errs = sbi->sb_err; timeshift = sbi->sb_timeshift;
413 if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase, &conv,
414 &eas, &chk, &errs, &chkdsk, ×hift))) {
415 printk("HPFS: bad mount options.\n");
422 if (timeshift != sbi->sb_timeshift) {
423 printk("HPFS: timeshift can't be changed using remount.\n");
429 sbi->sb_uid = uid; sbi->sb_gid = gid;
430 sbi->sb_mode = 0777 & ~umask;
431 sbi->sb_lowercase = lowercase; sbi->sb_conv = conv;
432 sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk;
433 sbi->sb_err = errs; sbi->sb_timeshift = timeshift;
435 if (!(*flags & MS_RDONLY)) mark_dirty(s);
437 replace_mount_options(s, new_opts);
450 /* Super operations */
452 static const struct super_operations hpfs_sops =
454 .alloc_inode = hpfs_alloc_inode,
455 .destroy_inode = hpfs_destroy_inode,
456 .evict_inode = hpfs_evict_inode,
457 .put_super = hpfs_put_super,
458 .statfs = hpfs_statfs,
459 .remount_fs = hpfs_remount_fs,
460 .show_options = generic_show_options,
463 static int hpfs_fill_super(struct super_block *s, void *options, int silent)
465 struct buffer_head *bh0, *bh1, *bh2;
466 struct hpfs_boot_block *bootblock;
467 struct hpfs_super_block *superblock;
468 struct hpfs_spare_block *spareblock;
469 struct hpfs_sb_info *sbi;
475 int lowercase, conv, eas, chk, errs, chkdsk, timeshift;
477 dnode_secno root_dno;
478 struct hpfs_dirent *de = NULL;
479 struct quad_buffer_head qbh;
483 save_mount_options(s, options);
485 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
491 sbi->sb_bmp_dir = NULL;
492 sbi->sb_cp_table = NULL;
494 mutex_init(&sbi->hpfs_mutex);
499 umask = current_umask();
508 if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase, &conv,
509 &eas, &chk, &errs, &chkdsk, ×hift))) {
510 printk("HPFS: bad mount options.\n");
518 /*sbi->sb_mounting = 1;*/
519 sb_set_blocksize(s, 512);
520 sbi->sb_fs_size = -1;
521 if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
522 if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
523 if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;
526 if (/*bootblock->magic != BB_MAGIC
527 ||*/ superblock->magic != SB_MAGIC
528 || spareblock->magic != SP_MAGIC) {
529 if (!silent) printk("HPFS: Bad magic ... probably not HPFS\n");
534 if (!(s->s_flags & MS_RDONLY) &&
535 superblock->funcversion != 2 && superblock->funcversion != 3) {
536 printk("HPFS: Bad version %d,%d. Mount readonly to go around\n",
537 (int)superblock->version, (int)superblock->funcversion);
538 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");
542 s->s_flags |= MS_NOATIME;
544 /* Fill superblock stuff */
545 s->s_magic = HPFS_SUPER_MAGIC;
546 s->s_op = &hpfs_sops;
547 s->s_d_op = &hpfs_dentry_operations;
549 sbi->sb_root = superblock->root;
550 sbi->sb_fs_size = superblock->n_sectors;
551 sbi->sb_bitmaps = superblock->bitmaps;
552 sbi->sb_dirband_start = superblock->dir_band_start;
553 sbi->sb_dirband_size = superblock->n_dir_band;
554 sbi->sb_dmap = superblock->dir_band_bitmap;
557 sbi->sb_mode = 0777 & ~umask;
559 sbi->sb_n_free_dnodes = -1;
560 sbi->sb_lowercase = lowercase;
564 sbi->sb_chkdsk = chkdsk;
566 sbi->sb_timeshift = timeshift;
567 sbi->sb_was_error = 0;
568 sbi->sb_cp_table = NULL;
569 sbi->sb_c_bitmap = -1;
570 sbi->sb_max_fwd_alloc = 0xffffff;
572 /* Load bitmap directory */
573 if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, superblock->bitmaps)))
576 /* Check for general fs errors*/
577 if (spareblock->dirty && !spareblock->old_wrote) {
579 printk("HPFS: Improperly stopped, not mounted\n");
582 hpfs_error(s, "improperly stopped");
585 if (!(s->s_flags & MS_RDONLY)) {
586 spareblock->dirty = 1;
587 spareblock->old_wrote = 0;
588 mark_buffer_dirty(bh2);
591 if (spareblock->hotfixes_used || spareblock->n_spares_used) {
593 printk("HPFS: Hotfixes not supported here, try chkdsk\n");
597 hpfs_error(s, "hotfixes not supported here, try chkdsk");
598 if (errs == 0) printk("HPFS: Proceeding, but your filesystem will be probably corrupted by this driver...\n");
599 else printk("HPFS: This driver may read bad files or crash when operating on disk with hotfixes.\n");
601 if (spareblock->n_dnode_spares != spareblock->n_dnode_spares_free) {
603 printk("HPFS: Spare dnodes used, try chkdsk\n");
607 hpfs_error(s, "warning: spare dnodes used, try chkdsk");
608 if (errs == 0) printk("HPFS: Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
612 if (superblock->dir_band_end - superblock->dir_band_start + 1 != superblock->n_dir_band ||
613 superblock->dir_band_end < superblock->dir_band_start || superblock->n_dir_band > 0x4000) {
614 hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
615 superblock->dir_band_start, superblock->dir_band_end, superblock->n_dir_band);
618 a = sbi->sb_dirband_size;
619 sbi->sb_dirband_size = 0;
620 if (hpfs_chk_sectors(s, superblock->dir_band_start, superblock->n_dir_band, "dir_band") ||
621 hpfs_chk_sectors(s, superblock->dir_band_bitmap, 4, "dir_band_bitmap") ||
622 hpfs_chk_sectors(s, superblock->bitmaps, 4, "bitmaps")) {
626 sbi->sb_dirband_size = a;
627 } else printk("HPFS: You really don't want any checks? You are crazy...\n");
629 /* Load code page table */
630 if (spareblock->n_code_pages)
631 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, spareblock->code_page_dir)))
632 printk("HPFS: Warning: code page support is disabled\n");
638 root = iget_locked(s, sbi->sb_root);
641 hpfs_init_inode(root);
642 hpfs_read_inode(root);
643 unlock_new_inode(root);
644 s->s_root = d_alloc_root(root);
651 * find the root directory's . pointer & finish filling in the inode
654 root_dno = hpfs_fnode_dno(s, sbi->sb_root);
656 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
658 hpfs_error(s, "unable to find root dir");
660 root->i_atime.tv_sec = local_to_gmt(s, de->read_date);
661 root->i_atime.tv_nsec = 0;
662 root->i_mtime.tv_sec = local_to_gmt(s, de->write_date);
663 root->i_mtime.tv_nsec = 0;
664 root->i_ctime.tv_sec = local_to_gmt(s, de->creation_date);
665 root->i_ctime.tv_nsec = 0;
666 hpfs_i(root)->i_ea_size = de->ea_size;
667 hpfs_i(root)->i_parent_dir = root->i_ino;
668 if (root->i_size == -1)
670 if (root->i_blocks == -1)
683 kfree(sbi->sb_bmp_dir);
684 kfree(sbi->sb_cp_table);
690 static struct dentry *hpfs_mount(struct file_system_type *fs_type,
691 int flags, const char *dev_name, void *data)
693 return mount_bdev(fs_type, flags, dev_name, data, hpfs_fill_super);
696 static struct file_system_type hpfs_fs_type = {
697 .owner = THIS_MODULE,
700 .kill_sb = kill_block_super,
701 .fs_flags = FS_REQUIRES_DEV,
704 static int __init init_hpfs_fs(void)
706 int err = init_inodecache();
709 err = register_filesystem(&hpfs_fs_type);
714 destroy_inodecache();
719 static void __exit exit_hpfs_fs(void)
721 unregister_filesystem(&hpfs_fs_type);
722 destroy_inodecache();
725 module_init(init_hpfs_fs)
726 module_exit(exit_hpfs_fs)
727 MODULE_LICENSE("GPL");