[PATCH v8 1/3] fs_parser: add fsparam_u16 helper

[Joanne Koong <joannelkoong@xxxxxxxxx>]

Add a fsparam helper for unsigned 16 bit values.

Signed-off-by: Joanne Koong <joannelkoong@xxxxxxxxx>
---
 fs/fs_parser.c            | 14 ++++++++++++++
 include/linux/fs_parser.h |  9 ++++++---
 2 files changed, 20 insertions(+), 3 deletions(-)

diff --git a/fs/fs_parser.c b/fs/fs_parser.c
index 24727ec34e5a..0e06f9618c89 100644
--- a/fs/fs_parser.c
+++ b/fs/fs_parser.c
@@ -210,6 +210,20 @@ int fs_param_is_bool(struct p_log *log, const struct fs_parameter_spec *p,
 }
 EXPORT_SYMBOL(fs_param_is_bool);
 
+int fs_param_is_u16(struct p_log *log, const struct fs_parameter_spec *p,
+		    struct fs_parameter *param, struct fs_parse_result *result)
+{
+	int base = (unsigned long)p->data;
+	if (param->type != fs_value_is_string)
+		return fs_param_bad_value(log, param);
+	if (!*param->string && (p->flags & fs_param_can_be_empty))
+		return 0;
+	if (kstrtou16(param->string, base, &result->uint_16) < 0)
+		return fs_param_bad_value(log, param);
+	return 0;
+}
+EXPORT_SYMBOL(fs_param_is_u16);
+
 int fs_param_is_u32(struct p_log *log, const struct fs_parameter_spec *p,
 		    struct fs_parameter *param, struct fs_parse_result *result)
 {
diff --git a/include/linux/fs_parser.h b/include/linux/fs_parser.h
index 6cf713a7e6c6..1c940756300c 100644
--- a/include/linux/fs_parser.h
+++ b/include/linux/fs_parser.h
@@ -26,9 +26,10 @@ typedef int fs_param_type(struct p_log *,
 /*
  * The type of parameter expected.
  */
-fs_param_type fs_param_is_bool, fs_param_is_u32, fs_param_is_s32, fs_param_is_u64,
-	fs_param_is_enum, fs_param_is_string, fs_param_is_blob, fs_param_is_blockdev,
-	fs_param_is_path, fs_param_is_fd, fs_param_is_uid, fs_param_is_gid;
+fs_param_type fs_param_is_bool, fs_param_is_u16, fs_param_is_u32, fs_param_is_s32,
+	fs_param_is_u64, fs_param_is_enum, fs_param_is_string, fs_param_is_blob,
+	fs_param_is_blockdev, fs_param_is_path, fs_param_is_fd, fs_param_is_uid,
+	fs_param_is_gid;
 
 /*
  * Specification of the type of value a parameter wants.
@@ -55,6 +56,7 @@ struct fs_parse_result {
 	union {
 		bool		boolean;	/* For spec_bool */
 		int		int_32;		/* For spec_s32/spec_enum */
+		u16             uint_16;	/* For spec_u16 */
 		unsigned int	uint_32;	/* For spec_u32{,_octal,_hex}/spec_enum */
 		u64		uint_64;	/* For spec_u64 */
 		kuid_t		uid;
@@ -119,6 +121,7 @@ static inline bool fs_validate_description(const char *name,
 #define fsparam_flag_no(NAME, OPT) \
 			__fsparam(NULL, NAME, OPT, fs_param_neg_with_no, NULL)
 #define fsparam_bool(NAME, OPT)	__fsparam(fs_param_is_bool, NAME, OPT, 0, NULL)
+#define fsparam_u16(NAME, OPT)	__fsparam(fs_param_is_u16, NAME, OPT, 0, NULL)
 #define fsparam_u32(NAME, OPT)	__fsparam(fs_param_is_u32, NAME, OPT, 0, NULL)
 #define fsparam_u32oct(NAME, OPT) \
 			__fsparam(fs_param_is_u32, NAME, OPT, 0, (void *)8)
-- 
2.43.5