Adding upstream version 4.19.249.upstream/4.19.249upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 797 insertions, 0 deletions

diff --git a/fs/hpfs/super.c b/fs/hpfs/super.c
new file mode 100644
index 000000000..f2c3ebcd3
--- /dev/null
+++ b/fs/hpfs/super.c
@@ -0,0 +1,797 @@
+/*
+ *  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>
+#include <linux/bitmap.h>
+#include <linux/slab.h>
+#include <linux/seq_file.h>
+
+/* Mark the filesystem dirty, so that chkdsk checks it when os/2 booted */
+
+static void mark_dirty(struct super_block *s, int remount)
+{
+	if (hpfs_sb(s)->sb_chkdsk && (remount || !sb_rdonly(s))) {
+		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);
+			sync_dirty_buffer(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 (sb_rdonly(s)) return;
+	sync_blockdev(s->s_bdev);
+	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);
+		sync_dirty_buffer(bh);
+		brelse(bh);
+	}
+}
+
+/* Filesystem error... */
+void hpfs_error(struct super_block *s, const char *fmt, ...)
+{
+	struct va_format vaf;
+	va_list args;
+
+	va_start(args, fmt);
+
+	vaf.fmt = fmt;
+	vaf.va = &args;
+
+	pr_err("filesystem error: %pV", &vaf);
+
+	va_end(args);
+
+	if (!hpfs_sb(s)->sb_was_error) {
+		if (hpfs_sb(s)->sb_err == 2) {
+			pr_cont("; crashing the system because you wanted it\n");
+			mark_dirty(s, 0);
+			panic("HPFS panic");
+		} else if (hpfs_sb(s)->sb_err == 1) {
+			if (sb_rdonly(s))
+				pr_cont("; already mounted read-only\n");
+			else {
+				pr_cont("; remounting read-only\n");
+				mark_dirty(s, 0);
+				s->s_flags |= SB_RDONLY;
+			}
+		} else if (sb_rdonly(s))
+				pr_cont("; going on - but anything won't be destroyed because it's read-only\n");
+		else
+			pr_cont("; corrupted filesystem mounted read/write - your computer will explode within 20 seconds ... but you wanted it so!\n");
+	} else
+		pr_cont("\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 free_sbi(struct hpfs_sb_info *sbi)
+{
+	kfree(sbi->sb_cp_table);
+	kfree(sbi->sb_bmp_dir);
+	kfree(sbi);
+}
+
+static void lazy_free_sbi(struct rcu_head *rcu)
+{
+	free_sbi(container_of(rcu, struct hpfs_sb_info, rcu));
+}
+
+static void hpfs_put_super(struct super_block *s)
+{
+	hpfs_lock(s);
+	unmark_dirty(s);
+	hpfs_unlock(s);
+	call_rcu(&hpfs_sb(s)->rcu, lazy_free_sbi);
+}
+
+static unsigned hpfs_count_one_bitmap(struct super_block *s, secno secno)
+{
+	struct quad_buffer_head qbh;
+	unsigned long *bits;
+	unsigned count;
+
+	bits = hpfs_map_4sectors(s, secno, &qbh, 0);
+	if (!bits)
+		return (unsigned)-1;
+	count = bitmap_weight(bits, 2048 * BITS_PER_BYTE);
+	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 < COUNT_RD_AHEAD; n++) {
+		hpfs_prefetch_bitmap(s, n);
+	}
+	for (n = 0; n < n_bands; n++) {
+		unsigned c;
+		hpfs_prefetch_bitmap(s, n + COUNT_RD_AHEAD);
+		c = hpfs_count_one_bitmap(s, le32_to_cpu(hpfs_sb(s)->sb_bmp_dir[n]));
+		if (c != (unsigned)-1)
+			count += c;
+	}
+	return count;
+}
+
+unsigned hpfs_get_free_dnodes(struct super_block *s)
+{
+	struct hpfs_sb_info *sbi = hpfs_sb(s);
+	if (sbi->sb_n_free_dnodes == (unsigned)-1) {
+		unsigned c = hpfs_count_one_bitmap(s, sbi->sb_dmap);
+		if (c == (unsigned)-1)
+			return 0;
+		sbi->sb_n_free_dnodes = c;
+	}
+	return sbi->sb_n_free_dnodes;
+}
+
+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);
+	u64 id = huge_encode_dev(s->s_bdev->bd_dev);
+
+	hpfs_lock(s);
+
+	if (sbi->sb_n_free == (unsigned)-1)
+		sbi->sb_n_free = count_bitmaps(s);
+
+	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 = hpfs_get_free_dnodes(s);
+	buf->f_fsid.val[0] = (u32)id;
+	buf->f_fsid.val[1] = (u32)(id >> 32);
+	buf->f_namelen = 254;
+
+	hpfs_unlock(s);
+
+	return 0;
+}
+
+
+long hpfs_ioctl(struct file *file, unsigned cmd, unsigned long arg)
+{
+	switch (cmd) {
+		case FITRIM: {
+			struct fstrim_range range;
+			secno n_trimmed;
+			int r;
+			if (!capable(CAP_SYS_ADMIN))
+				return -EPERM;
+			if (copy_from_user(&range, (struct fstrim_range __user *)arg, sizeof(range)))
+				return -EFAULT;
+			r = hpfs_trim_fs(file_inode(file)->i_sb, range.start >> 9, (range.start + range.len) >> 9, (range.minlen + 511) >> 9, &n_trimmed);
+			if (r)
+				return r;
+			range.len = (u64)n_trimmed << 9;
+			if (copy_to_user((struct fstrim_range __user *)arg, &range, sizeof(range)))
+				return -EFAULT;
+			return 0;
+		}
+		default: {
+			return -ENOIOCTLCMD;
+		}
+	}
+}
+
+
+static struct kmem_cache * hpfs_inode_cachep;
+
+static struct inode *hpfs_alloc_inode(struct super_block *sb)
+{
+	struct hpfs_inode_info *ei;
+	ei = kmem_cache_alloc(hpfs_inode_cachep, GFP_NOFS);
+	if (!ei)
+		return NULL;
+	return &ei->vfs_inode;
+}
+
+static void hpfs_i_callback(struct rcu_head *head)
+{
+	struct inode *inode = container_of(head, struct inode, i_rcu);
+	kmem_cache_free(hpfs_inode_cachep, hpfs_i(inode));
+}
+
+static void hpfs_destroy_inode(struct inode *inode)
+{
+	call_rcu(&inode->i_rcu, hpfs_i_callback);
+}
+
+static void init_once(void *foo)
+{
+	struct hpfs_inode_info *ei = (struct hpfs_inode_info *) foo;
+
+	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|SLAB_ACCOUNT),
+					     init_once);
+	if (hpfs_inode_cachep == NULL)
+		return -ENOMEM;
+	return 0;
+}
+
+static void destroy_inodecache(void)
+{
+	/*
+	 * Make sure all delayed rcu free inodes are flushed before we
+	 * destroy cache.
+	 */
+	rcu_barrier();
+	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_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 const 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_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, kuid_t *uid, kgid_t *gid, umode_t *umask,
+		      int *lowercase, int *eas, int *chk, int *errs,
+		      int *chkdsk, int *timeshift)
+{
+	char *p;
+	int option;
+
+	if (!opts)
+		return 1;
+
+	/*pr_info("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 = make_kuid(current_user_ns(), option);
+			if (!uid_valid(*uid))
+				return 0;
+			break;
+		case Opt_gid:
+			if (match_int(args, &option))
+				return 0;
+			*gid = make_kgid(current_user_ns(), option);
+			if (!gid_valid(*gid))
+				return 0;
+			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_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)
+{
+	pr_info("\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\
+      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)
+{
+	kuid_t uid;
+	kgid_t gid;
+	umode_t umask;
+	int lowercase, eas, chk, errs, chkdsk, timeshift;
+	int o;
+	struct hpfs_sb_info *sbi = hpfs_sb(s);
+
+	sync_filesystem(s);
+
+	*flags |= SB_NOATIME;
+
+	hpfs_lock(s);
+	uid = sbi->sb_uid; gid = sbi->sb_gid;
+	umask = 0777 & ~sbi->sb_mode;
+	lowercase = sbi->sb_lowercase;
+	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,
+	    &eas, &chk, &errs, &chkdsk, &timeshift))) {
+		pr_err("bad mount options.\n");
+		goto out_err;
+	}
+	if (o == 2) {
+		hpfs_help();
+		goto out_err;
+	}
+	if (timeshift != sbi->sb_timeshift) {
+		pr_err("timeshift can't be changed using remount.\n");
+		goto out_err;
+	}
+
+	unmark_dirty(s);
+
+	sbi->sb_uid = uid; sbi->sb_gid = gid;
+	sbi->sb_mode = 0777 & ~umask;
+	sbi->sb_lowercase = lowercase;
+	sbi->sb_eas = eas; sbi->sb_chk = chk; sbi->sb_chkdsk = chkdsk;
+	sbi->sb_err = errs; sbi->sb_timeshift = timeshift;
+
+	if (!(*flags & SB_RDONLY)) mark_dirty(s, 1);
+
+	hpfs_unlock(s);
+	return 0;
+
+out_err:
+	hpfs_unlock(s);
+	return -EINVAL;
+}
+
+static int hpfs_show_options(struct seq_file *seq, struct dentry *root)
+{
+	struct hpfs_sb_info *sbi = hpfs_sb(root->d_sb);
+
+	seq_printf(seq, ",uid=%u", from_kuid_munged(&init_user_ns, sbi->sb_uid));
+	seq_printf(seq, ",gid=%u", from_kgid_munged(&init_user_ns, sbi->sb_gid));
+	seq_printf(seq, ",umask=%03o", (~sbi->sb_mode & 0777));
+	if (sbi->sb_lowercase)
+		seq_printf(seq, ",case=lower");
+	if (!sbi->sb_chk)
+		seq_printf(seq, ",check=none");
+	if (sbi->sb_chk == 2)
+		seq_printf(seq, ",check=strict");
+	if (!sbi->sb_err)
+		seq_printf(seq, ",errors=continue");
+	if (sbi->sb_err == 2)
+		seq_printf(seq, ",errors=panic");
+	if (!sbi->sb_chkdsk)
+		seq_printf(seq, ",chkdsk=no");
+	if (sbi->sb_chkdsk == 2)
+		seq_printf(seq, ",chkdsk=always");
+	if (!sbi->sb_eas)
+		seq_printf(seq, ",eas=no");
+	if (sbi->sb_eas == 1)
+		seq_printf(seq, ",eas=ro");
+	if (sbi->sb_timeshift)
+		seq_printf(seq, ",timeshift=%d", sbi->sb_timeshift);
+	return 0;
+}
+
+/* Super operations */
+
+static const struct super_operations hpfs_sops =
+{
+	.alloc_inode	= hpfs_alloc_inode,
+	.destroy_inode	= hpfs_destroy_inode,
+	.evict_inode	= hpfs_evict_inode,
+	.put_super	= hpfs_put_super,
+	.statfs		= hpfs_statfs,
+	.remount_fs	= hpfs_remount_fs,
+	.show_options	= hpfs_show_options,
+};
+
+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;
+
+	kuid_t uid;
+	kgid_t gid;
+	umode_t umask;
+	int lowercase, 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;
+
+	mutex_init(&sbi->hpfs_mutex);
+	hpfs_lock(s);
+
+	uid = current_uid();
+	gid = current_gid();
+	umask = current_umask();
+	lowercase = 0;
+	eas = 2;
+	chk = 1;
+	errs = 1;
+	chkdsk = 1;
+	timeshift = 0;
+
+	if (!(o = parse_opts(options, &uid, &gid, &umask, &lowercase,
+	    &eas, &chk, &errs, &chkdsk, &timeshift))) {
+		pr_err("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 (/*le16_to_cpu(bootblock->magic) != BB_MAGIC
+	    ||*/ le32_to_cpu(superblock->magic) != SB_MAGIC
+	    || le32_to_cpu(spareblock->magic) != SP_MAGIC) {
+		if (!silent)
+			pr_err("Bad magic ... probably not HPFS\n");
+		goto bail4;
+	}
+
+	/* Check version */
+	if (!sb_rdonly(s) && superblock->funcversion != 2 && superblock->funcversion != 3) {
+		pr_err("Bad version %d,%d. Mount readonly to go around\n",
+			(int)superblock->version, (int)superblock->funcversion);
+		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");
+		goto bail4;
+	}
+
+	s->s_flags |= SB_NOATIME;
+
+	/* Fill superblock stuff */
+	s->s_magic = HPFS_SUPER_MAGIC;
+	s->s_op = &hpfs_sops;
+	s->s_d_op = &hpfs_dentry_operations;
+
+	sbi->sb_root = le32_to_cpu(superblock->root);
+	sbi->sb_fs_size = le32_to_cpu(superblock->n_sectors);
+	sbi->sb_bitmaps = le32_to_cpu(superblock->bitmaps);
+	sbi->sb_dirband_start = le32_to_cpu(superblock->dir_band_start);
+	sbi->sb_dirband_size = le32_to_cpu(superblock->n_dir_band);
+	sbi->sb_dmap = le32_to_cpu(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_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;
+
+	if (sbi->sb_fs_size >= 0x80000000) {
+		hpfs_error(s, "invalid size in superblock: %08x",
+			(unsigned)sbi->sb_fs_size);
+		goto bail4;
+	}
+
+	if (spareblock->n_spares_used)
+		hpfs_load_hotfix_map(s, spareblock);
+
+	/* Load bitmap directory */
+	if (!(sbi->sb_bmp_dir = hpfs_load_bitmap_directory(s, le32_to_cpu(superblock->bitmaps))))
+		goto bail4;
+	
+	/* Check for general fs errors*/
+	if (spareblock->dirty && !spareblock->old_wrote) {
+		if (errs == 2) {
+			pr_err("Improperly stopped, not mounted\n");
+			goto bail4;
+		}
+		hpfs_error(s, "improperly stopped");
+	}
+
+	if (!sb_rdonly(s)) {
+		spareblock->dirty = 1;
+		spareblock->old_wrote = 0;
+		mark_buffer_dirty(bh2);
+	}
+
+	if (le32_to_cpu(spareblock->n_dnode_spares) != le32_to_cpu(spareblock->n_dnode_spares_free)) {
+		if (errs >= 2) {
+			pr_err("Spare dnodes used, try chkdsk\n");
+			mark_dirty(s, 0);
+			goto bail4;
+		}
+		hpfs_error(s, "warning: spare dnodes used, try chkdsk");
+		if (errs == 0)
+			pr_err("Proceeding, but your filesystem could be corrupted if you delete files or directories\n");
+	}
+	if (chk) {
+		unsigned a;
+		if (le32_to_cpu(superblock->dir_band_end) - le32_to_cpu(superblock->dir_band_start) + 1 != le32_to_cpu(superblock->n_dir_band) ||
+		    le32_to_cpu(superblock->dir_band_end) < le32_to_cpu(superblock->dir_band_start) || le32_to_cpu(superblock->n_dir_band) > 0x4000) {
+			hpfs_error(s, "dir band size mismatch: dir_band_start==%08x, dir_band_end==%08x, n_dir_band==%08x",
+				le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->dir_band_end), le32_to_cpu(superblock->n_dir_band));
+			goto bail4;
+		}
+		a = sbi->sb_dirband_size;
+		sbi->sb_dirband_size = 0;
+		if (hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_start), le32_to_cpu(superblock->n_dir_band), "dir_band") ||
+		    hpfs_chk_sectors(s, le32_to_cpu(superblock->dir_band_bitmap), 4, "dir_band_bitmap") ||
+		    hpfs_chk_sectors(s, le32_to_cpu(superblock->bitmaps), 4, "bitmaps")) {
+			mark_dirty(s, 0);
+			goto bail4;
+		}
+		sbi->sb_dirband_size = a;
+	} else
+		pr_err("You really don't want any checks? You are crazy...\n");
+
+	/* Load code page table */
+	if (le32_to_cpu(spareblock->n_code_pages))
+		if (!(sbi->sb_cp_table = hpfs_load_code_page(s, le32_to_cpu(spareblock->code_page_dir))))
+			pr_err("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_make_root(root);
+	if (!s->s_root)
+		goto bail0;
+
+	/*
+	 * 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, le32_to_cpu(de->read_date));
+		root->i_atime.tv_nsec = 0;
+		root->i_mtime.tv_sec = local_to_gmt(s, le32_to_cpu(de->write_date));
+		root->i_mtime.tv_nsec = 0;
+		root->i_ctime.tv_sec = local_to_gmt(s, le32_to_cpu(de->creation_date));
+		root->i_ctime.tv_nsec = 0;
+		hpfs_i(root)->i_ea_size = le32_to_cpu(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);
+	}
+	hpfs_unlock(s);
+	return 0;
+
+bail4:	brelse(bh2);
+bail3:	brelse(bh1);
+bail2:	brelse(bh0);
+bail1:
+bail0:
+	hpfs_unlock(s);
+	free_sbi(sbi);
+	return -EINVAL;
+}
+
+static struct dentry *hpfs_mount(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data)
+{
+	return mount_bdev(fs_type, flags, dev_name, data, hpfs_fill_super);
+}
+
+static struct file_system_type hpfs_fs_type = {
+	.owner		= THIS_MODULE,
+	.name		= "hpfs",
+	.mount		= hpfs_mount,
+	.kill_sb	= kill_block_super,
+	.fs_flags	= FS_REQUIRES_DEV,
+};
+MODULE_ALIAS_FS("hpfs");
+
+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");