From 57d569635c05dc4ea9b9f1f8dcec69b9ddc989b2 Mon Sep 17 00:00:00 2001 From: Ralf Baechle Date: Thu, 17 Jun 1999 14:08:29 +0000 Subject: The rest of 2.3.6. --- fs/hpfs/super.c | 598 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 598 insertions(+) create mode 100644 fs/hpfs/super.c (limited to 'fs/hpfs/super.c') diff --git a/fs/hpfs/super.c b/fs/hpfs/super.c new file mode 100644 index 000000000..a50f2a49b --- /dev/null +++ b/fs/hpfs/super.c @@ -0,0 +1,598 @@ +/* + * linux/fs/hpfs/super.c + * + * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999 + * + * mouning, unmounting, error handling + */ + +#include +#include "hpfs_fn.h" +#include + +/* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */ + +static void mark_dirty(struct super_block *s) +{ + if (s->s_hpfs_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, 1); + 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 = s->s_hpfs_chkdsk > 1 - s->s_hpfs_was_error; + sb->old_wrote = s->s_hpfs_chkdsk >= 2 && !s->s_hpfs_was_error; + mark_buffer_dirty(bh, 1); + brelse(bh); + } +} + +/* Filesystem error... */ + +#define ERR_BUF_SIZE 1024 + +void hpfs_error(struct super_block *s, char *m,...) +{ + char *buf; + va_list l; + va_start(l, m); + if (!(buf = kmalloc(ERR_BUF_SIZE, GFP_KERNEL))) + printk("HPFS: No memory for error message '%s'\n",m); + else if (vsprintf(buf, m, l) >= ERR_BUF_SIZE) + printk("HPFS: Grrrr... Kernel memory corrupted ... going on, but it'll crash very soon :-(\n"); + printk("HPFS: filesystem error: "); + if (buf) printk("%s", buf); + else printk("%s\n",m); + if (!s->s_hpfs_was_error) { + if (s->s_hpfs_err == 2) { + printk("; crashing the system because you wanted it\n"); + mark_dirty(s); + panic("HPFS panic"); + } else if (s->s_hpfs_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"); + if (buf) kfree(buf); + s->s_hpfs_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; +} + +void hpfs_put_super(struct super_block *s) +{ + if (s->s_hpfs_cp_table) kfree(s->s_hpfs_cp_table); + if (s->s_hpfs_bmp_dir) kfree(s->s_hpfs_bmp_dir); + unmark_dirty(s); + s->s_dev = 0; + MOD_DEC_USE_COUNT; +} + +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 = (s->s_hpfs_fs_size + 0x3fff) >> 14; + count = 0; + for (n = 0; n < n_bands; n++) + count += hpfs_count_one_bitmap(s, s->s_hpfs_bmp_dir[n]); + return count; +} + +int hpfs_statfs(struct super_block *s, struct statfs *buf, int bufsiz) +{ + struct statfs tmp; + /*if (s->s_hpfs_n_free == -1) {*/ + s->s_hpfs_n_free = count_bitmaps(s); + s->s_hpfs_n_free_dnodes = hpfs_count_one_bitmap(s, s->s_hpfs_dmap); + /*}*/ + tmp.f_type = s->s_magic; + tmp.f_bsize = 512; + tmp.f_blocks = s->s_hpfs_fs_size; + tmp.f_bfree = s->s_hpfs_n_free; + tmp.f_bavail = s->s_hpfs_n_free; + tmp.f_files = s->s_hpfs_dirband_size / 4; + tmp.f_ffree = s->s_hpfs_n_free_dnodes; + tmp.f_namelen = 254; + return copy_to_user(buf, &tmp, bufsiz) ? -EFAULT : 0; +} + +/* Super operations */ + +static const struct super_operations hpfs_sops = +{ + hpfs_read_inode, /* read_inode */ + NULL, /* write_inode */ + NULL, /* put_inode */ + hpfs_delete_inode, /* delete inode */ + hpfs_notify_change, /* notify_change */ + hpfs_put_super, /* put_super */ + NULL, /* write_super */ + hpfs_statfs, /* statfs */ + hpfs_remount_fs, /* remount_fs */ + NULL, /* clear inode */ + NULL, /* umount_begin */ +}; + +/* + * A tiny parser for option strings, stolen from dosfs. + * + * Stolen again from read-only hpfs. + */ + +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, *rhs; + + if (!opts) + return 1; + + /*printk("Parsing opts: '%s'\n",opts);*/ + + for (p = strtok(opts, ","); p != 0; p = strtok(0, ",")) { + if ((rhs = strchr(p, '=')) != 0) + *rhs++ = '\0'; + if (!strcmp(p, "help")) return 2; + if (!strcmp(p, "uid")) { + if (!rhs || !*rhs) + return 0; + *uid = simple_strtoul(rhs, &rhs, 0); + if (*rhs) + return 0; + } + else if (!strcmp(p, "gid")) { + if (!rhs || !*rhs) + return 0; + *gid = simple_strtoul(rhs, &rhs, 0); + if (*rhs) + return 0; + } + else if (!strcmp(p, "umask")) { + if (!rhs || !*rhs) + return 0; + *umask = simple_strtoul(rhs, &rhs, 8); + if (*rhs) + return 0; + } + else if (!strcmp(p, "timeshift")) { + int m = 1; + if (!rhs || !*rhs) + return 0; + if (*rhs == '-') m = -1; + if (*rhs == '+' || *rhs == '-') rhs++; + *timeshift = simple_strtoul(rhs, &rhs, 0) * m; + if (*rhs) + return 0; + } + else if (!strcmp(p, "case")) { + if (!strcmp(rhs, "lower")) + *lowercase = 1; + else if (!strcmp(rhs, "asis")) + *lowercase = 0; + else + return 0; + } + else if (!strcmp(p, "conv")) { + if (!strcmp(rhs, "binary")) + *conv = CONV_BINARY; + else if (!strcmp(rhs, "text")) + *conv = CONV_TEXT; + else if (!strcmp(rhs, "auto")) + *conv = CONV_AUTO; + else + return 0; + } + else if (!strcmp(p, "check")) { + if (!strcmp(rhs, "none")) + *chk = 0; + else if (!strcmp(rhs, "normal")) + *chk = 1; + else if (!strcmp(rhs, "strict")) + *chk = 2; + else + return 0; + } + else if (!strcmp(p, "errors")) { + if (!strcmp(rhs, "continue")) + *errs = 0; + else if (!strcmp(rhs, "remount-ro")) + *errs = 1; + else if (!strcmp(rhs, "panic")) + *errs = 2; + else + return 0; + } + else if (!strcmp(p, "eas")) { + if (!strcmp(rhs, "no")) + *eas = 0; + else if (!strcmp(rhs, "ro")) + *eas = 1; + else if (!strcmp(rhs, "rw")) + *eas = 2; + else + return 0; + } + else if (!strcmp(p, "chkdsk")) { + if (!strcmp(rhs, "no")) + *chkdsk = 0; + else if (!strcmp(rhs, "errors")) + *chkdsk = 1; + else if (!strcmp(rhs, "always")) + *chkdsk = 2; + else + return 0; + } + else + return 0; + } + return 1; +} + +static inline void hpfs_help() +{ + 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"); +} + +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; + + *flags |= MS_NOATIME; + + uid = s->s_hpfs_uid; gid = s->s_hpfs_gid; + umask = 0777 & ~s->s_hpfs_mode; + lowercase = s->s_hpfs_lowercase; conv = s->s_hpfs_conv; + eas = s->s_hpfs_eas; chk = s->s_hpfs_chk; chkdsk = s->s_hpfs_chkdsk; + errs = s->s_hpfs_err; timeshift = s->s_hpfs_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 != s->s_hpfs_timeshift) { + printk("HPFS: timeshift can't be changed using remount.\n"); + return 1; + } + + unmark_dirty(s); + + s->s_hpfs_uid = uid; s->s_hpfs_gid = gid; + s->s_hpfs_mode = 0777 & ~umask; + s->s_hpfs_lowercase = lowercase; s->s_hpfs_conv = conv; + s->s_hpfs_eas = eas; s->s_hpfs_chk = chk; s->s_hpfs_chkdsk = chkdsk; + s->s_hpfs_err = errs; s->s_hpfs_timeshift = timeshift; + + if (!(*flags & MS_RDONLY)) mark_dirty(s); + + return 0; +} + +struct super_block *hpfs_read_super(struct super_block *s, void *options, + int silent) +{ + kdev_t dev; + struct buffer_head *bh0, *bh1, *bh2; + struct hpfs_boot_block *bootblock; + struct hpfs_super_block *superblock; + struct hpfs_spare_block *spareblock; + + 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; + + MOD_INC_USE_COUNT; + + s->s_hpfs_bmp_dir = NULL; + s->s_hpfs_cp_table = NULL; + + s->s_hpfs_creation_de_lock = s->s_hpfs_rd_inode = 0; + init_waitqueue_head(&s->s_hpfs_creation_de); + init_waitqueue_head(&s->s_hpfs_iget_q); + + 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; + } + + /*s->s_hpfs_mounting = 1;*/ + lock_super(s); + dev = s->s_dev; + set_blocksize(dev, 512); + s->s_hpfs_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_blocksize = 512; + s->s_blocksize_bits = 9; + s->s_op = (struct super_operations *) &hpfs_sops; + + s->s_hpfs_root = superblock->root; + s->s_hpfs_fs_size = superblock->n_sectors; + s->s_hpfs_bitmaps = superblock->bitmaps; + s->s_hpfs_dirband_start = superblock->dir_band_start; + s->s_hpfs_dirband_size = superblock->n_dir_band; + s->s_hpfs_dmap = superblock->dir_band_bitmap; + s->s_hpfs_uid = uid; + s->s_hpfs_gid = gid; + s->s_hpfs_mode = 0777 & ~umask; + s->s_hpfs_n_free = -1; + s->s_hpfs_n_free_dnodes = -1; + s->s_hpfs_lowercase = lowercase; + s->s_hpfs_conv = conv; + s->s_hpfs_eas = eas; + s->s_hpfs_chk = chk; + s->s_hpfs_chkdsk = chkdsk; + s->s_hpfs_err = errs; + s->s_hpfs_timeshift = timeshift; + s->s_hpfs_was_error = 0; + s->s_hpfs_cp_table = NULL; + s->s_hpfs_c_bitmap = -1; + + /* Load bitmap directory */ + if (!(s->s_hpfs_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, 1); + } + + 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 = s->s_hpfs_dirband_size; + s->s_hpfs_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; + } + s->s_hpfs_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 (!(s->s_hpfs_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); + + hpfs_lock_iget(s, 1); + s->s_root = d_alloc_root(iget(s, s->s_hpfs_root)); + hpfs_unlock_iget(s); + unlock_super(s); + if (!s->s_root || !s->s_root->d_inode) { + printk("HPFS: iget failed. Why???\n"); + 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, s->s_hpfs_root); + if (root_dno) + de = map_dirent(s->s_root->d_inode, root_dno, "\001\001", 2, NULL, &qbh); + if (!root_dno || !de) hpfs_error(s, "unable to find root dir"); + else { + s->s_root->d_inode->i_atime = local_to_gmt(s, de->read_date); + s->s_root->d_inode->i_mtime = local_to_gmt(s, de->write_date); + s->s_root->d_inode->i_ctime = local_to_gmt(s, de->creation_date); + s->s_root->d_inode->i_hpfs_ea_size = de->ea_size; + s->s_root->d_inode->i_hpfs_parent_dir = s->s_root->d_inode->i_ino; + if (s->s_root->d_inode->i_size == -1) s->s_root->d_inode->i_size = 2048; + if (s->s_root->d_inode->i_blocks == -1) s->s_root->d_inode->i_blocks = 5; + } + if (de) hpfs_brelse4(&qbh); + + return s; + +bail4: brelse(bh2); +bail3: brelse(bh1); +bail2: brelse(bh0); +bail1: unlock_super(s); +bail0: s->s_dev = 0; + if (s->s_hpfs_bmp_dir) kfree(s->s_hpfs_bmp_dir); + if (s->s_hpfs_cp_table) kfree(s->s_hpfs_cp_table); + MOD_DEC_USE_COUNT; + return NULL; +} + +struct file_system_type hpfs_fs_type = { + "hpfs", FS_REQUIRES_DEV, hpfs_read_super, NULL +}; + +int init_hpfs_fs(void) +{ + return register_filesystem(&hpfs_fs_type); +} + +#ifdef MODULE + +/*int register_symtab_from(struct symbol_table *, long *);*/ + +int init_module(void) +{ + /*int status; + if (!(status = init_hpfs_fs())) register_symtab(NULL); + return status;*/ + return init_hpfs_fs(); +} + +void cleanup_module(void) +{ + unregister_filesystem(&hpfs_fs_type); +} + +#endif -- cgit v1.2.3