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-rw-r--r--fs/devpts/inode.c18
1 files changed, 12 insertions, 6 deletions
diff --git a/fs/devpts/inode.c b/fs/devpts/inode.c
index 21165cf934ff..c68edb969441 100644
--- a/fs/devpts/inode.c
+++ b/fs/devpts/inode.c
@@ -90,6 +90,15 @@ static inline struct super_block *pts_sb_from_inode(struct inode *inode)
#define PARSE_MOUNT 0
#define PARSE_REMOUNT 1
+/*
+ * parse_mount_options():
+ * Set @opts to mount options specified in @data. If an option is not
+ * specified in @data, set it to its default value. The exception is
+ * 'newinstance' option which can only be set/cleared on a mount (i.e.
+ * cannot be changed during remount).
+ *
+ * Note: @data may be NULL (in which case all options are set to default).
+ */
static int parse_mount_options(char *data, int op, struct pts_mount_opts *opts)
{
char *p;
@@ -355,12 +364,9 @@ static int devpts_get_sb(struct file_system_type *fs_type,
struct pts_mount_opts opts;
struct super_block *s;
- memset(&opts, 0, sizeof(opts));
- if (data) {
- error = parse_mount_options(data, PARSE_MOUNT, &opts);
- if (error)
- return error;
- }
+ error = parse_mount_options(data, PARSE_MOUNT, &opts);
+ if (error)
+ return error;
if (opts.newinstance)
s = sget(fs_type, NULL, set_anon_super, NULL);