ufs: implement show_options

An implementation of show_options method for UFS.
Signed-off-by: NEvgeniy Dushistov <dushistov@mail.ru>
Cc: "Randy.Dunlap" <rdunlap@xenotime.net>
Signed-off-by: NAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: NLinus Torvalds <torvalds@linux-foundation.org>

fs/ufs/super.c

@@ -88,6 +88,8 @@
 #include <linux/buffer_head.h>
 #include <linux/vfs.h>
 #include <linux/log2.h>
+#include <linux/mount.h>
+#include <linux/seq_file.h>
 
 #include "swab.h"
 #include "util.h"
@@ -286,10 +288,21 @@ void ufs_warning (struct super_block * sb, const char * function,
 }
 
 enum {
-	Opt_type_old, Opt_type_sunx86, Opt_type_sun, Opt_type_sunos, Opt_type_44bsd,
-	Opt_type_ufs2, Opt_type_hp, Opt_type_nextstepcd, Opt_type_nextstep,
-	Opt_type_openstep, Opt_onerror_panic, Opt_onerror_lock,
-	Opt_onerror_umount, Opt_onerror_repair, Opt_err
+       Opt_type_old = UFS_MOUNT_UFSTYPE_OLD,
+       Opt_type_sunx86 = UFS_MOUNT_UFSTYPE_SUNx86,
+       Opt_type_sun = UFS_MOUNT_UFSTYPE_SUN,
+       Opt_type_sunos = UFS_MOUNT_UFSTYPE_SUNOS,
+       Opt_type_44bsd = UFS_MOUNT_UFSTYPE_44BSD,
+       Opt_type_ufs2 = UFS_MOUNT_UFSTYPE_UFS2,
+       Opt_type_hp = UFS_MOUNT_UFSTYPE_HP,
+       Opt_type_nextstepcd = UFS_MOUNT_UFSTYPE_NEXTSTEP_CD,
+       Opt_type_nextstep = UFS_MOUNT_UFSTYPE_NEXTSTEP,
+       Opt_type_openstep = UFS_MOUNT_UFSTYPE_OPENSTEP,
+       Opt_onerror_panic = UFS_MOUNT_ONERROR_PANIC,
+       Opt_onerror_lock = UFS_MOUNT_ONERROR_LOCK,
+       Opt_onerror_umount = UFS_MOUNT_ONERROR_UMOUNT,
+       Opt_onerror_repair = UFS_MOUNT_ONERROR_REPAIR,
+       Opt_err
 };
 
 static match_table_t tokens = {
@@ -304,6 +317,7 @@ static match_table_t tokens = {
 	{Opt_type_nextstepcd, "ufstype=nextstep-cd"},
 	{Opt_type_nextstep, "ufstype=nextstep"},
 	{Opt_type_openstep, "ufstype=openstep"},
+/*end of possible ufs types */
 	{Opt_onerror_panic, "onerror=panic"},
 	{Opt_onerror_lock, "onerror=lock"},
 	{Opt_onerror_umount, "onerror=umount"},
@@ -1206,6 +1220,26 @@ static int ufs_remount (struct super_block *sb, int *mount_flags, char *data)
 	return 0;
 }
 
+static int ufs_show_options(struct seq_file *seq, struct vfsmount *vfs)
+{
+	struct ufs_sb_info *sbi = UFS_SB(vfs->mnt_sb);
+	unsigned mval = sbi->s_mount_opt & UFS_MOUNT_UFSTYPE;
+	struct match_token *tp = tokens;
+
+	while (tp->token != Opt_onerror_panic && tp->token != mval)
+		++tp;
+	BUG_ON(tp->token == Opt_onerror_panic);
+	seq_printf(seq, ",%s", tp->pattern);
+
+	mval = sbi->s_mount_opt & UFS_MOUNT_ONERROR;
+	while (tp->token != Opt_err && tp->token != mval)
+		++tp;
+	BUG_ON(tp->token == Opt_err);
+	seq_printf(seq, ",%s", tp->pattern);
+
+	return 0;
+}
+
 static int ufs_statfs(struct dentry *dentry, struct kstatfs *buf)
 {
 	struct super_block *sb = dentry->d_sb;
@@ -1298,6 +1332,7 @@ static const struct super_operations ufs_super_ops = {
 	.write_super	= ufs_write_super,
 	.statfs		= ufs_statfs,
 	.remount_fs	= ufs_remount,
+	.show_options   = ufs_show_options,
 #ifdef CONFIG_QUOTA
 	.quota_read	= ufs_quota_read,
 	.quota_write	= ufs_quota_write,