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>
15 /* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */
17 static void mark_dirty(struct super_block *s)
19 if (hpfs_sb(s)->sb_chkdsk && !(s->s_flags & MS_RDONLY)) {
20 struct buffer_head *bh;
21 struct hpfs_spare_block *sb;
22 if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
25 mark_buffer_dirty(bh);
31 /* Mark the filesystem clean (mark it dirty for chkdsk if chkdsk==2 or if there
34 static void unmark_dirty(struct super_block *s)
36 struct buffer_head *bh;
37 struct hpfs_spare_block *sb;
38 if (s->s_flags & MS_RDONLY) return;
39 if ((sb = hpfs_map_sector(s, 17, &bh, 0))) {
40 sb->dirty = hpfs_sb(s)->sb_chkdsk > 1 - hpfs_sb(s)->sb_was_error;
41 sb->old_wrote = hpfs_sb(s)->sb_chkdsk >= 2 && !hpfs_sb(s)->sb_was_error;
42 mark_buffer_dirty(bh);
47 /* Filesystem error... */
49 #define ERR_BUF_SIZE 1024
51 void hpfs_error(struct super_block *s, char *m,...)
56 if (!(buf = kmalloc(ERR_BUF_SIZE, GFP_KERNEL)))
57 printk("HPFS: No memory for error message '%s'\n",m);
58 else if (vsprintf(buf, m, l) >= ERR_BUF_SIZE)
59 printk("HPFS: Grrrr... Kernel memory corrupted ... going on, but it'll crash very soon :-(\n");
60 printk("HPFS: filesystem error: ");
61 if (buf) printk("%s", buf);
62 else printk("%s\n",m);
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");
79 hpfs_sb(s)->sb_was_error = 1;
83 * A little trick to detect cycles in many hpfs structures and don't let the
84 * kernel crash on corrupted filesystem. When first called, set c2 to 0.
86 * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories
87 * nested each in other, chkdsk locked up happilly.
90 int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2,
93 if (*c2 && *c1 == key) {
94 hpfs_error(s, "cycle detected on key %08x in %s", key, msg);
98 if (!((*c2 - 1) & *c2)) *c1 = key;
102 static void hpfs_put_super(struct super_block *s)
104 struct hpfs_sb_info *sbi = hpfs_sb(s);
105 if (sbi->sb_cp_table) kfree(sbi->sb_cp_table);
106 if (sbi->sb_bmp_dir) kfree(sbi->sb_bmp_dir);
112 unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
114 struct quad_buffer_head qbh;
117 if (!(bits = hpfs_map_4sectors(s, secno, &qbh, 4))) return 0;
119 for (i = 0; i < 2048 / sizeof(unsigned); i++) {
121 if (!bits[i]) continue;
122 for (b = bits[i]; b; b>>=1) count += b & 1;
128 static unsigned count_bitmaps(struct super_block *s)
130 unsigned n, count, n_bands;
131 n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14;
133 for (n = 0; n < n_bands; n++)
134 count += hpfs_count_one_bitmap(s, hpfs_sb(s)->sb_bmp_dir[n]);
138 static int hpfs_statfs(struct super_block *s, struct kstatfs *buf)
140 struct hpfs_sb_info *sbi = hpfs_sb(s);
143 /*if (sbi->sb_n_free == -1) {*/
144 sbi->sb_n_free = count_bitmaps(s);
145 sbi->sb_n_free_dnodes = hpfs_count_one_bitmap(s, sbi->sb_dmap);
147 buf->f_type = s->s_magic;
149 buf->f_blocks = sbi->sb_fs_size;
150 buf->f_bfree = sbi->sb_n_free;
151 buf->f_bavail = sbi->sb_n_free;
152 buf->f_files = sbi->sb_dirband_size / 4;
153 buf->f_ffree = sbi->sb_n_free_dnodes;
154 buf->f_namelen = 254;
161 static kmem_cache_t * hpfs_inode_cachep;
163 static struct inode *hpfs_alloc_inode(struct super_block *sb)
165 struct hpfs_inode_info *ei;
166 ei = (struct hpfs_inode_info *)kmem_cache_alloc(hpfs_inode_cachep, SLAB_NOFS);
169 ei->vfs_inode.i_version = 1;
170 return &ei->vfs_inode;
173 static void hpfs_destroy_inode(struct inode *inode)
175 kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
178 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
180 struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;
182 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
183 SLAB_CTOR_CONSTRUCTOR) {
184 init_MUTEX(&ei->i_sem);
185 init_MUTEX(&ei->i_parent);
186 inode_init_once(&ei->vfs_inode);
190 static int init_inodecache(void)
192 hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache",
193 sizeof(struct hpfs_inode_info),
194 0, SLAB_RECLAIM_ACCOUNT,
196 if (hpfs_inode_cachep == NULL)
201 static void destroy_inodecache(void)
203 if (kmem_cache_destroy(hpfs_inode_cachep))
204 printk(KERN_INFO "hpfs_inode_cache: not all structures were freed\n");
208 * A tiny parser for option strings, stolen from dosfs.
209 * Stolen again from read-only hpfs.
210 * And updated for table-driven option parsing.
214 Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis,
215 Opt_conv_binary, Opt_conv_text, Opt_conv_auto,
216 Opt_check_none, Opt_check_normal, Opt_check_strict,
217 Opt_err_cont, Opt_err_ro, Opt_err_panic,
218 Opt_eas_no, Opt_eas_ro, Opt_eas_rw,
219 Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always,
220 Opt_timeshift, Opt_err,
223 static match_table_t tokens = {
227 {Opt_umask, "umask=%o"},
228 {Opt_case_lower, "case=lower"},
229 {Opt_case_asis, "case=asis"},
230 {Opt_conv_binary, "conv=binary"},
231 {Opt_conv_text, "conv=text"},
232 {Opt_conv_auto, "conv=auto"},
233 {Opt_check_none, "check=none"},
234 {Opt_check_normal, "check=normal"},
235 {Opt_check_strict, "check=strict"},
236 {Opt_err_cont, "errors=continue"},
237 {Opt_err_ro, "errors=remount-ro"},
238 {Opt_err_panic, "errors=panic"},
239 {Opt_eas_no, "eas=no"},
240 {Opt_eas_ro, "eas=ro"},
241 {Opt_eas_rw, "eas=rw"},
242 {Opt_chkdsk_no, "chkdsk=no"},
243 {Opt_chkdsk_errors, "chkdsk=errors"},
244 {Opt_chkdsk_always, "chkdsk=always"},
245 {Opt_timeshift, "timeshift=%d"},
249 static int parse_opts(char *opts, uid_t *uid, gid_t *gid, umode_t *umask,
250 int *lowercase, int *conv, int *eas, int *chk, int *errs,
251 int *chkdsk, int *timeshift)
259 /*printk("Parsing opts: '%s'\n",opts);*/
261 while ((p = strsep(&opts, ",")) != NULL) {
262 substring_t args[MAX_OPT_ARGS];
267 token = match_token(p, tokens, args);
272 if (match_int(args, &option))
277 if (match_int(args, &option))
282 if (match_octal(args, &option))
292 case Opt_conv_binary:
304 case Opt_check_normal:
307 case Opt_check_strict:
331 case Opt_chkdsk_errors:
334 case Opt_chkdsk_always:
340 char *rhs = args[0].from;
343 if (*rhs == '-') m = -1;
344 if (*rhs == '+' || *rhs == '-') rhs++;
345 *timeshift = simple_strtoul(rhs, &rhs, 0) * m;
357 static inline void hpfs_help(void)
360 HPFS filesystem options:\n\
361 help do not mount and display this text\n\
362 uid=xxx set uid of files that don't have uid specified in eas\n\
363 gid=xxx set gid of files that don't have gid specified in eas\n\
364 umask=xxx set mode of files that don't have mode specified in eas\n\
365 case=lower lowercase all files\n\
366 case=asis do not lowercase files (default)\n\
367 conv=binary do not convert CR/LF -> LF (default)\n\
368 conv=auto convert only files with known text extensions\n\
369 conv=text convert all files\n\
370 check=none no fs checks - kernel may crash on corrupted filesystem\n\
371 check=normal do some checks - it should not crash (default)\n\
372 check=strict do extra time-consuming checks, used for debugging\n\
373 errors=continue continue on errors\n\
374 errors=remount-ro remount read-only if errors found (default)\n\
375 errors=panic panic on errors\n\
376 chkdsk=no do not mark fs for chkdsking even if there were errors\n\
377 chkdsk=errors mark fs dirty if errors found (default)\n\
378 chkdsk=always always mark fs dirty - used for debugging\n\
379 eas=no ignore extended attributes\n\
380 eas=ro read but do not write extended attributes\n\
381 eas=rw r/w eas => enables chmod, chown, mknod, ln -s (default)\n\
382 timeshift=nnn add nnn seconds to file times\n\
386 static int hpfs_remount_fs(struct super_block *s, int *flags, char *data)
391 int lowercase, conv, eas, chk, errs, chkdsk, timeshift;
393 struct hpfs_sb_info *sbi = hpfs_sb(s);
395 *flags |= MS_NOATIME;
397 uid = sbi->sb_uid; gid = sbi->sb_gid;
398 umask = 0777 & ~sbi->sb_mode;
399 lowercase = sbi->sb_lowercase; conv = sbi->sb_conv;
400 eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk;
401 errs = sbi->sb_err; timeshift = sbi->sb_timeshift;
403 if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase, &conv,
404 &eas, &chk, &errs, &chkdsk, ×hift))) {
405 printk("HPFS: bad mount options.\n");
412 if (timeshift != sbi->sb_timeshift) {
413 printk("HPFS: timeshift can't be changed using remount.\n");
419 sbi->sb_uid = uid; sbi->sb_gid = gid;
420 sbi->sb_mode = 0777 & ~umask;
421 sbi->sb_lowercase = lowercase; sbi->sb_conv = conv;
422 sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk;
423 sbi->sb_err = errs; sbi->sb_timeshift = timeshift;
425 if (!(*flags & MS_RDONLY)) mark_dirty(s);
430 /* Super operations */
432 static struct super_operations hpfs_sops =
434 .alloc_inode = hpfs_alloc_inode,
435 .destroy_inode = hpfs_destroy_inode,
436 .delete_inode = hpfs_delete_inode,
437 .put_super = hpfs_put_super,
438 .statfs = hpfs_statfs,
439 .remount_fs = hpfs_remount_fs,
442 static int hpfs_fill_super(struct super_block *s, void *options, int silent)
444 struct buffer_head *bh0, *bh1, *bh2;
445 struct hpfs_boot_block *bootblock;
446 struct hpfs_super_block *superblock;
447 struct hpfs_spare_block *spareblock;
448 struct hpfs_sb_info *sbi;
454 int lowercase, conv, eas, chk, errs, chkdsk, timeshift;
456 dnode_secno root_dno;
457 struct hpfs_dirent *de = NULL;
458 struct quad_buffer_head qbh;
462 sbi = kmalloc(sizeof(*sbi), GFP_KERNEL);
466 memset(sbi, 0, sizeof(*sbi));
468 sbi->sb_bmp_dir = NULL;
469 sbi->sb_cp_table = NULL;
471 init_MUTEX(&sbi->hpfs_creation_de);
475 umask = current->fs->umask;
484 if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase, &conv,
485 &eas, &chk, &errs, &chkdsk, ×hift))) {
486 printk("HPFS: bad mount options.\n");
494 /*sbi->sb_mounting = 1;*/
495 sb_set_blocksize(s, 512);
496 sbi->sb_fs_size = -1;
497 if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1;
498 if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2;
499 if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3;
502 if (/*bootblock->magic != BB_MAGIC
503 ||*/ superblock->magic != SB_MAGIC
504 || spareblock->magic != SP_MAGIC) {
505 if (!silent) printk("HPFS: Bad magic ... probably not HPFS\n");
510 if (!(s->s_flags & MS_RDONLY) &&
511 superblock->funcversion != 2 && superblock->funcversion != 3) {
512 printk("HPFS: Bad version %d,%d. Mount readonly to go around\n",
513 (int)superblock->version, (int)superblock->funcversion);
514 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");
518 s->s_flags |= MS_NOATIME;
520 /* Fill superblock stuff */
521 s->s_magic = HPFS_SUPER_MAGIC;
522 s->s_op = &hpfs_sops;
524 sbi->sb_root = superblock->root;
525 sbi->sb_fs_size = superblock->n_sectors;
526 sbi->sb_bitmaps = superblock->bitmaps;
527 sbi->sb_dirband_start = superblock->dir_band_start;
528 sbi->sb_dirband_size = superblock->n_dir_band;
529 sbi->sb_dmap = superblock->dir_band_bitmap;
532 sbi->sb_mode = 0777 & ~umask;
534 sbi->sb_n_free_dnodes = -1;
535 sbi->sb_lowercase = lowercase;
539 sbi->sb_chkdsk = chkdsk;
541 sbi->sb_timeshift = timeshift;
542 sbi->sb_was_error = 0;
543 sbi->sb_cp_table = NULL;
544 sbi->sb_c_bitmap = -1;
545 sbi->sb_max_fwd_alloc = 0xffffff;
547 /* Load bitmap directory */
548 if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, superblock->bitmaps)))
551 /* Check for general fs errors*/
552 if (spareblock->dirty && !spareblock->old_wrote) {
554 printk("HPFS: Improperly stopped, not mounted\n");
557 hpfs_error(s, "improperly stopped");
560 if (!(s->s_flags & MS_RDONLY)) {
561 spareblock->dirty = 1;
562 spareblock->old_wrote = 0;
563 mark_buffer_dirty(bh2);
566 if (spareblock->hotfixes_used || spareblock->n_spares_used) {
568 printk("HPFS: Hotfixes not supported here, try chkdsk\n");
572 hpfs_error(s, "hotfixes not supported here, try chkdsk");
573 if (errs == 0) printk("HPFS: Proceeding, but your filesystem will be probably corrupted by this driver...\n");
574 else printk("HPFS: This driver may read bad files or crash when operating on disk with hotfixes.\n");
576 if (spareblock->n_dnode_spares != spareblock->n_dnode_spares_free) {
578 printk("HPFS: Spare dnodes used, try chkdsk\n");
582 hpfs_error(s, "warning: spare dnodes used, try chkdsk");
583 if (errs == 0) printk("HPFS: Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
587 if (superblock->dir_band_end - superblock->dir_band_start + 1 != superblock->n_dir_band ||
588 superblock->dir_band_end < superblock->dir_band_start || superblock->n_dir_band > 0x4000) {
589 hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
590 superblock->dir_band_start, superblock->dir_band_end, superblock->n_dir_band);
593 a = sbi->sb_dirband_size;
594 sbi->sb_dirband_size = 0;
595 if (hpfs_chk_sectors(s, superblock->dir_band_start, superblock->n_dir_band, "dir_band") ||
596 hpfs_chk_sectors(s, superblock->dir_band_bitmap, 4, "dir_band_bitmap") ||
597 hpfs_chk_sectors(s, superblock->bitmaps, 4, "bitmaps")) {
601 sbi->sb_dirband_size = a;
602 } else printk("HPFS: You really don't want any checks? You are crazy...\n");
604 /* Load code page table */
605 if (spareblock->n_code_pages)
606 if (!(sbi->sb_cp_table = hpfs_load_code_page(s, spareblock->code_page_dir)))
607 printk("HPFS: Warning: code page support is disabled\n");
613 root = iget_locked(s, sbi->sb_root);
616 hpfs_init_inode(root);
617 hpfs_read_inode(root);
618 unlock_new_inode(root);
619 s->s_root = d_alloc_root(root);
624 hpfs_set_dentry_operations(s->s_root);
627 * find the root directory's . pointer & finish filling in the inode
630 root_dno = hpfs_fnode_dno(s, sbi->sb_root);
632 de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh);
634 hpfs_error(s, "unable to find root dir");
636 root->i_atime.tv_sec = local_to_gmt(s, de->read_date);
637 root->i_atime.tv_nsec = 0;
638 root->i_mtime.tv_sec = local_to_gmt(s, de->write_date);
639 root->i_mtime.tv_nsec = 0;
640 root->i_ctime.tv_sec = local_to_gmt(s, de->creation_date);
641 root->i_ctime.tv_nsec = 0;
642 hpfs_i(root)->i_ea_size = de->ea_size;
643 hpfs_i(root)->i_parent_dir = root->i_ino;
644 if (root->i_size == -1)
646 if (root->i_blocks == -1)
657 if (sbi->sb_bmp_dir) kfree(sbi->sb_bmp_dir);
658 if (sbi->sb_cp_table) kfree(sbi->sb_cp_table);
664 static struct super_block *hpfs_get_sb(struct file_system_type *fs_type,
665 int flags, const char *dev_name, void *data)
667 return get_sb_bdev(fs_type, flags, dev_name, data, hpfs_fill_super);
670 static struct file_system_type hpfs_fs_type = {
671 .owner = THIS_MODULE,
673 .get_sb = hpfs_get_sb,
674 .kill_sb = kill_block_super,
675 .fs_flags = FS_REQUIRES_DEV,
678 static int __init init_hpfs_fs(void)
680 int err = init_inodecache();
683 err = register_filesystem(&hpfs_fs_type);
688 destroy_inodecache();
693 static void __exit exit_hpfs_fs(void)
695 unregister_filesystem(&hpfs_fs_type);
696 destroy_inodecache();
699 module_init(init_hpfs_fs)
700 module_exit(exit_hpfs_fs)
701 MODULE_LICENSE("GPL");