/* * linux/fs/hpfs/super.c * * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999 * * mounting, unmounting, error handling */ #include "hpfs_fn.h" #include <linux/module.h> #include <linux/parser.h> #include <linux/init.h> #include <linux/statfs.h> #include <linux/magic.h> #include <linux/sched.h> /* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */ static void mark_dirty(struct super_block *s) { if (hpfs_sb(s)->sb_chkdsk && !(s->s_flags & MS_RDONLY)) { struct buffer_head *bh; struct hpfs_spare_block *sb; if ((sb = hpfs_map_sector(s, 17, &bh, 0))) { sb->dirty = 1; sb->old_wrote = 0; mark_buffer_dirty(bh); brelse(bh); } } } /* Mark the filesystem clean (mark it dirty for chkdsk if chkdsk==2 or if there were errors) */ static void unmark_dirty(struct super_block *s) { struct buffer_head *bh; struct hpfs_spare_block *sb; if (s->s_flags & MS_RDONLY) return; if ((sb = hpfs_map_sector(s, 17, &bh, 0))) { sb->dirty = hpfs_sb(s)->sb_chkdsk > 1 - hpfs_sb(s)->sb_was_error; sb->old_wrote = hpfs_sb(s)->sb_chkdsk >= 2 && !hpfs_sb(s)->sb_was_error; mark_buffer_dirty(bh); brelse(bh); } } /* Filesystem error... */ static char err_buf[1024]; void hpfs_error(struct super_block *s, const char *fmt, ...) { va_list args; va_start(args, fmt); vsnprintf(err_buf, sizeof(err_buf), fmt, args); va_end(args); printk("HPFS: filesystem error: %s", err_buf); if (!hpfs_sb(s)->sb_was_error) { if (hpfs_sb(s)->sb_err == 2) { printk("; crashing the system because you wanted it\n"); mark_dirty(s); panic("HPFS panic"); } else if (hpfs_sb(s)->sb_err == 1) { if (s->s_flags & MS_RDONLY) printk("; already mounted read-only\n"); else { printk("; remounting read-only\n"); mark_dirty(s); s->s_flags |= MS_RDONLY; } } else if (s->s_flags & MS_RDONLY) printk("; going on - but anything won't be destroyed because it's read-only\n"); else printk("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n"); } else printk("\n"); hpfs_sb(s)->sb_was_error = 1; } /* * A little trick to detect cycles in many hpfs structures and don't let the * kernel crash on corrupted filesystem. When first called, set c2 to 0. * * BTW. chkdsk doesn't detect cycles correctly. When I had 2 lost directories * nested each in other, chkdsk locked up happilly. */ int hpfs_stop_cycles(struct super_block *s, int key, int *c1, int *c2, char *msg) { if (*c2 && *c1 == key) { hpfs_error(s, "cycle detected on key %08x in %s", key, msg); return 1; } (*c2)++; if (!((*c2 - 1) & *c2)) *c1 = key; return 0; } static void hpfs_put_super(struct super_block *s) { struct hpfs_sb_info *sbi = hpfs_sb(s); kfree(sbi->sb_cp_table); kfree(sbi->sb_bmp_dir); unmark_dirty(s); s->s_fs_info = NULL; kfree(sbi); } unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno) { struct quad_buffer_head qbh; unsigned *bits; unsigned i, count; if (!(bits = hpfs_map_4sectors(s, secno, &qbh, 4))) return 0; count = 0; for (i = 0; i < 2048 / sizeof(unsigned); i++) { unsigned b; if (!bits[i]) continue; for (b = bits[i]; b; b>>=1) count += b & 1; } hpfs_brelse4(&qbh); return count; } static unsigned count_bitmaps(struct super_block *s) { unsigned n, count, n_bands; n_bands = (hpfs_sb(s)->sb_fs_size + 0x3fff) >> 14; count = 0; for (n = 0; n < n_bands; n++) count += hpfs_count_one_bitmap(s, hpfs_sb(s)->sb_bmp_dir[n]); return count; } static int hpfs_statfs(struct dentry *dentry, struct kstatfs *buf) { struct super_block *s = dentry->d_sb; struct hpfs_sb_info *sbi = hpfs_sb(s); lock_kernel(); /*if (sbi->sb_n_free == -1) {*/ sbi->sb_n_free = count_bitmaps(s); sbi->sb_n_free_dnodes = hpfs_count_one_bitmap(s, sbi->sb_dmap); /*}*/ buf->f_type = s->s_magic; buf->f_bsize = 512; buf->f_blocks = sbi->sb_fs_size; buf->f_bfree = sbi->sb_n_free; buf->f_bavail = sbi->sb_n_free; buf->f_files = sbi->sb_dirband_size / 4; buf->f_ffree = sbi->sb_n_free_dnodes; buf->f_namelen = 254; unlock_kernel(); return 0; } static struct kmem_cache * hpfs_inode_cachep; static struct inode *hpfs_alloc_inode(struct super_block *sb) { struct hpfs_inode_info *ei; ei = (struct hpfs_inode_info *)kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS); if (!ei) return NULL; ei->vfs_inode.i_version = 1; return &ei->vfs_inode; } static void hpfs_destroy_inode(struct inode *inode) { kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode)); } static void init_once(struct kmem_cache *cachep, void *foo) { struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo; mutex_init(&ei->i_mutex); mutex_init(&ei->i_parent_mutex); inode_init_once(&ei->vfs_inode); } static int init_inodecache(void) { hpfs_inode_cachep = kmem_cache_create("hpfs_inode_cache", sizeof(struct hpfs_inode_info), 0, (SLAB_RECLAIM_ACCOUNT| SLAB_MEM_SPREAD), init_once); if (hpfs_inode_cachep == NULL) return -ENOMEM; return 0; } static void destroy_inodecache(void) { kmem_cache_destroy(hpfs_inode_cachep); } /* * A tiny parser for option strings, stolen from dosfs. * Stolen again from read-only hpfs. * And updated for table-driven option parsing. */ enum { Opt_help, Opt_uid, Opt_gid, Opt_umask, Opt_case_lower, Opt_case_asis, Opt_conv_binary, Opt_conv_text, Opt_conv_auto, Opt_check_none, Opt_check_normal, Opt_check_strict, Opt_err_cont, Opt_err_ro, Opt_err_panic, Opt_eas_no, Opt_eas_ro, Opt_eas_rw, Opt_chkdsk_no, Opt_chkdsk_errors, Opt_chkdsk_always, Opt_timeshift, Opt_err, }; static match_table_t tokens = { {Opt_help, "help"}, {Opt_uid, "uid=%u"}, {Opt_gid, "gid=%u"}, {Opt_umask, "umask=%o"}, {Opt_case_lower, "case=lower"}, {Opt_case_asis, "case=asis"}, {Opt_conv_binary, "conv=binary"}, {Opt_conv_text, "conv=text"}, {Opt_conv_auto, "conv=auto"}, {Opt_check_none, "check=none"}, {Opt_check_normal, "check=normal"}, {Opt_check_strict, "check=strict"}, {Opt_err_cont, "errors=continue"}, {Opt_err_ro, "errors=remount-ro"}, {Opt_err_panic, "errors=panic"}, {Opt_eas_no, "eas=no"}, {Opt_eas_ro, "eas=ro"}, {Opt_eas_rw, "eas=rw"}, {Opt_chkdsk_no, "chkdsk=no"}, {Opt_chkdsk_errors, "chkdsk=errors"}, {Opt_chkdsk_always, "chkdsk=always"}, {Opt_timeshift, "timeshift=%d"}, {Opt_err, NULL}, }; static int parse_opts(char *opts, uid_t *uid, gid_t *gid, umode_t *umask, int *lowercase, int *conv, int *eas, int *chk, int *errs, int *chkdsk, int *timeshift) { char *p; int option; if (!opts) return 1; /*printk("Parsing opts: '%s'\n",opts);*/ while ((p = strsep(&opts, ",")) != NULL) { substring_t args[MAX_OPT_ARGS]; int token; if (!*p) continue; token = match_token(p, tokens, args); switch (token) { case Opt_help: return 2; case Opt_uid: if (match_int(args, &option)) return 0; *uid = option; break; case Opt_gid: if (match_int(args, &option)) return 0; *gid = option; break; case Opt_umask: if (match_octal(args, &option)) return 0; *umask = option; break; case Opt_case_lower: *lowercase = 1; break; case Opt_case_asis: *lowercase = 0; break; case Opt_conv_binary: *conv = CONV_BINARY; break; case Opt_conv_text: *conv = CONV_TEXT; break; case Opt_conv_auto: *conv = CONV_AUTO; break; case Opt_check_none: *chk = 0; break; case Opt_check_normal: *chk = 1; break; case Opt_check_strict: *chk = 2; break; case Opt_err_cont: *errs = 0; break; case Opt_err_ro: *errs = 1; break; case Opt_err_panic: *errs = 2; break; case Opt_eas_no: *eas = 0; break; case Opt_eas_ro: *eas = 1; break; case Opt_eas_rw: *eas = 2; break; case Opt_chkdsk_no: *chkdsk = 0; break; case Opt_chkdsk_errors: *chkdsk = 1; break; case Opt_chkdsk_always: *chkdsk = 2; break; case Opt_timeshift: { int m = 1; char *rhs = args[0].from; if (!rhs || !*rhs) return 0; if (*rhs == '-') m = -1; if (*rhs == '+' || *rhs == '-') rhs++; *timeshift = simple_strtoul(rhs, &rhs, 0) * m; if (*rhs) return 0; break; } default: return 0; } } return 1; } static inline void hpfs_help(void) { printk("\n\ HPFS filesystem options:\n\ help do not mount and display this text\n\ uid=xxx set uid of files that don't have uid specified in eas\n\ gid=xxx set gid of files that don't have gid specified in eas\n\ umask=xxx set mode of files that don't have mode specified in eas\n\ case=lower lowercase all files\n\ case=asis do not lowercase files (default)\n\ conv=binary do not convert CR/LF -> LF (default)\n\ conv=auto convert only files with known text extensions\n\ conv=text convert all files\n\ check=none no fs checks - kernel may crash on corrupted filesystem\n\ check=normal do some checks - it should not crash (default)\n\ check=strict do extra time-consuming checks, used for debugging\n\ errors=continue continue on errors\n\ errors=remount-ro remount read-only if errors found (default)\n\ errors=panic panic on errors\n\ chkdsk=no do not mark fs for chkdsking even if there were errors\n\ chkdsk=errors mark fs dirty if errors found (default)\n\ chkdsk=always always mark fs dirty - used for debugging\n\ eas=no ignore extended attributes\n\ eas=ro read but do not write extended attributes\n\ eas=rw r/w eas => enables chmod, chown, mknod, ln -s (default)\n\ timeshift=nnn add nnn seconds to file times\n\ \n"); } static int hpfs_remount_fs(struct super_block *s, int *flags, char *data) { uid_t uid; gid_t gid; umode_t umask; int lowercase, conv, eas, chk, errs, chkdsk, timeshift; int o; struct hpfs_sb_info *sbi = hpfs_sb(s); *flags |= MS_NOATIME; uid = sbi->sb_uid; gid = sbi->sb_gid; umask = 0777 & ~sbi->sb_mode; lowercase = sbi->sb_lowercase; conv = sbi->sb_conv; eas = sbi->sb_eas; chk = sbi->sb_chk; chkdsk = sbi->sb_chkdsk; errs = sbi->sb_err; timeshift = sbi->sb_timeshift; if (!(o = parse_opts(data, &uid, &gid, &umask, &lowercase, &conv, &eas, &chk, &errs, &chkdsk, ×hift))) { printk("HPFS: bad mount options.\n"); return 1; } if (o == 2) { hpfs_help(); return 1; } if (timeshift != sbi->sb_timeshift) { printk("HPFS: timeshift can't be changed using remount.\n"); return 1; } unmark_dirty(s); sbi->sb_uid = uid; sbi->sb_gid = gid; sbi->sb_mode = 0777 & ~umask; sbi->sb_lowercase = lowercase; sbi->sb_conv = conv; sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk; sbi->sb_err = errs; sbi->sb_timeshift = timeshift; if (!(*flags & MS_RDONLY)) mark_dirty(s); return 0; } /* Super operations */ static const struct super_operations hpfs_sops = { .alloc_inode = hpfs_alloc_inode, .destroy_inode = hpfs_destroy_inode, .delete_inode = hpfs_delete_inode, .put_super = hpfs_put_super, .statfs = hpfs_statfs, .remount_fs = hpfs_remount_fs, }; static int hpfs_fill_super(struct super_block *s, void *options, int silent) { struct buffer_head *bh0, *bh1, *bh2; struct hpfs_boot_block *bootblock; struct hpfs_super_block *superblock; struct hpfs_spare_block *spareblock; struct hpfs_sb_info *sbi; struct inode *root; uid_t uid; gid_t gid; umode_t umask; int lowercase, conv, eas, chk, errs, chkdsk, timeshift; dnode_secno root_dno; struct hpfs_dirent *de = NULL; struct quad_buffer_head qbh; int o; sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); if (!sbi) return -ENOMEM; s->s_fs_info = sbi; sbi->sb_bmp_dir = NULL; sbi->sb_cp_table = NULL; init_MUTEX(&sbi->hpfs_creation_de); uid = current->uid; gid = current->gid; umask = current->fs->umask; lowercase = 0; conv = CONV_BINARY; eas = 2; chk = 1; errs = 1; chkdsk = 1; timeshift = 0; if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase, &conv, &eas, &chk, &errs, &chkdsk, ×hift))) { printk("HPFS: bad mount options.\n"); goto bail0; } if (o==2) { hpfs_help(); goto bail0; } /*sbi->sb_mounting = 1;*/ sb_set_blocksize(s, 512); sbi->sb_fs_size = -1; if (!(bootblock = hpfs_map_sector(s, 0, &bh0, 0))) goto bail1; if (!(superblock = hpfs_map_sector(s, 16, &bh1, 1))) goto bail2; if (!(spareblock = hpfs_map_sector(s, 17, &bh2, 0))) goto bail3; /* Check magics */ if (/*bootblock->magic != BB_MAGIC ||*/ superblock->magic != SB_MAGIC || spareblock->magic != SP_MAGIC) { if (!silent) printk("HPFS: Bad magic ... probably not HPFS\n"); goto bail4; } /* Check version */ if (!(s->s_flags & MS_RDONLY) && superblock->funcversion != 2 && superblock->funcversion != 3) { printk("HPFS: Bad version %d,%d. Mount readonly to go around\n", (int)superblock->version, (int)superblock->funcversion); 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"); goto bail4; } s->s_flags |= MS_NOATIME; /* Fill superblock stuff */ s->s_magic = HPFS_SUPER_MAGIC; s->s_op = &hpfs_sops; sbi->sb_root = superblock->root; sbi->sb_fs_size = superblock->n_sectors; sbi->sb_bitmaps = superblock->bitmaps; sbi->sb_dirband_start = superblock->dir_band_start; sbi->sb_dirband_size = superblock->n_dir_band; sbi->sb_dmap = superblock->dir_band_bitmap; sbi->sb_uid = uid; sbi->sb_gid = gid; sbi->sb_mode = 0777 & ~umask; sbi->sb_n_free = -1; sbi->sb_n_free_dnodes = -1; sbi->sb_lowercase = lowercase; sbi->sb_conv = conv; sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk; sbi->sb_err = errs; sbi->sb_timeshift = timeshift; sbi->sb_was_error = 0; sbi->sb_cp_table = NULL; sbi->sb_c_bitmap = -1; sbi->sb_max_fwd_alloc = 0xffffff; /* Load bitmap directory */ if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, superblock->bitmaps))) goto bail4; /* Check for general fs errors*/ if (spareblock->dirty && !spareblock->old_wrote) { if (errs == 2) { printk("HPFS: Improperly stopped, not mounted\n"); goto bail4; } hpfs_error(s, "improperly stopped"); } if (!(s->s_flags & MS_RDONLY)) { spareblock->dirty = 1; spareblock->old_wrote = 0; mark_buffer_dirty(bh2); } if (spareblock->hotfixes_used || spareblock->n_spares_used) { if (errs >= 2) { printk("HPFS: Hotfixes not supported here, try chkdsk\n"); mark_dirty(s); goto bail4; } hpfs_error(s, "hotfixes not supported here, try chkdsk"); if (errs == 0) printk("HPFS: Proceeding, but your filesystem will be probably corrupted by this driver...\n"); else printk("HPFS: This driver may read bad files or crash when operating on disk with hotfixes.\n"); } if (spareblock->n_dnode_spares != spareblock->n_dnode_spares_free) { if (errs >= 2) { printk("HPFS: Spare dnodes used, try chkdsk\n"); mark_dirty(s); goto bail4; } hpfs_error(s, "warning: spare dnodes used, try chkdsk"); if (errs == 0) printk("HPFS: Proceeding, but your filesystem could be corrupted if you delete files or directories\n"); } if (chk) { unsigned a; if (superblock->dir_band_end - superblock->dir_band_start + 1 != superblock->n_dir_band || superblock->dir_band_end < superblock->dir_band_start || superblock->n_dir_band > 0x4000) { hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x", superblock->dir_band_start, superblock->dir_band_end, superblock->n_dir_band); goto bail4; } a = sbi->sb_dirband_size; sbi->sb_dirband_size = 0; if (hpfs_chk_sectors(s, superblock->dir_band_start, superblock->n_dir_band, "dir_band") || hpfs_chk_sectors(s, superblock->dir_band_bitmap, 4, "dir_band_bitmap") || hpfs_chk_sectors(s, superblock->bitmaps, 4, "bitmaps")) { mark_dirty(s); goto bail4; } sbi->sb_dirband_size = a; } else printk("HPFS: You really don't want any checks? You are crazy...\n"); /* Load code page table */ if (spareblock->n_code_pages) if (!(sbi->sb_cp_table = hpfs_load_code_page(s, spareblock->code_page_dir))) printk("HPFS: Warning: code page support is disabled\n"); brelse(bh2); brelse(bh1); brelse(bh0); root = iget_locked(s, sbi->sb_root); if (!root) goto bail0; hpfs_init_inode(root); hpfs_read_inode(root); unlock_new_inode(root); s->s_root = d_alloc_root(root); if (!s->s_root) { iput(root); goto bail0; } hpfs_set_dentry_operations(s->s_root); /* * find the root directory's . pointer & finish filling in the inode */ root_dno = hpfs_fnode_dno(s, sbi->sb_root); if (root_dno) de = map_dirent(root, root_dno, "\001\001", 2, NULL, &qbh); if (!de) hpfs_error(s, "unable to find root dir"); else { root->i_atime.tv_sec = local_to_gmt(s, de->read_date); root->i_atime.tv_nsec = 0; root->i_mtime.tv_sec = local_to_gmt(s, de->write_date); root->i_mtime.tv_nsec = 0; root->i_ctime.tv_sec = local_to_gmt(s, de->creation_date); root->i_ctime.tv_nsec = 0; hpfs_i(root)->i_ea_size = de->ea_size; hpfs_i(root)->i_parent_dir = root->i_ino; if (root->i_size == -1) root->i_size = 2048; if (root->i_blocks == -1) root->i_blocks = 5; hpfs_brelse4(&qbh); } return 0; bail4: brelse(bh2); bail3: brelse(bh1); bail2: brelse(bh0); bail1: bail0: kfree(sbi->sb_bmp_dir); kfree(sbi->sb_cp_table); s->s_fs_info = NULL; kfree(sbi); return -EINVAL; } static int hpfs_get_sb(struct file_system_type *fs_type, int flags, const char *dev_name, void *data, struct vfsmount *mnt) { return get_sb_bdev(fs_type, flags, dev_name, data, hpfs_fill_super, mnt); } static struct file_system_type hpfs_fs_type = { .owner = THIS_MODULE, .name = "hpfs", .get_sb = hpfs_get_sb, .kill_sb = kill_block_super, .fs_flags = FS_REQUIRES_DEV, }; static int __init init_hpfs_fs(void) { int err = init_inodecache(); if (err) goto out1; err = register_filesystem(&hpfs_fs_type); if (err) goto out; return 0; out: destroy_inodecache(); out1: return err; } static void __exit exit_hpfs_fs(void) { unregister_filesystem(&hpfs_fs_type); destroy_inodecache(); } module_init(init_hpfs_fs) module_exit(exit_hpfs_fs) MODULE_LICENSE("GPL");