[REPOST PATCH v3 04/16] xfs: mount-api - refactor suffix_kstrtoint()

[Ian Kent <raven@themaw.net>]

The mount-api doesn't have a "human unit" parse type yet so
the options that have values like "10k" etc. still need to
be converted by the fs.

But the value comes to the fs as a string (not a substring_t
type) so there's a need to change the conversion function to
take a character string instead.

After refactoring xfs_parseargs() and changing it to use
xfs_parse_param() match_kstrtoint() will no longer be used
and will be removed.

Signed-off-by: Ian Kent <raven@themaw.net>
---
 fs/xfs/xfs_super.c |   22 ++++++++++++++++++----
 1 file changed, 18 insertions(+), 4 deletions(-)

diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index 9c1ce3d70c08..6a16750b1314 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -160,13 +160,13 @@ static const struct fs_parameter_description xfs_fs_parameters = {
 };
 
 STATIC int
-suffix_kstrtoint(const substring_t *s, unsigned int base, int *res)
+suffix_kstrtoint(const char *s, unsigned int base, int *res)
 {
 	int	last, shift_left_factor = 0, _res;
 	char	*value;
 	int	ret = 0;
 
-	value = match_strdup(s);
+	value = kstrdup(s, GFP_KERNEL);
 	if (!value)
 		return -ENOMEM;
 
@@ -191,6 +191,20 @@ suffix_kstrtoint(const substring_t *s, unsigned int base, int *res)
 	return ret;
 }
 
+STATIC int
+match_kstrtoint(const substring_t *s, unsigned int base, int *res)
+{
+	const char	*value;
+	int ret;
+
+	value = match_strdup(s);
+	if (!value)
+		return -ENOMEM;
+	ret = suffix_kstrtoint(value, base, res);
+	kfree(value);
+	return ret;
+}
+
 /*
  * This function fills in xfs_mount_t fields based on mount args.
  * Note: the superblock has _not_ yet been read in.
@@ -262,7 +276,7 @@ xfs_parseargs(
 				return -EINVAL;
 			break;
 		case Opt_logbsize:
-			if (suffix_kstrtoint(args, 10, &mp->m_logbsize))
+			if (match_kstrtoint(args, 10, &mp->m_logbsize))
 				return -EINVAL;
 			break;
 		case Opt_logdev:
@@ -278,7 +292,7 @@ xfs_parseargs(
 				return -ENOMEM;
 			break;
 		case Opt_allocsize:
-			if (suffix_kstrtoint(args, 10, &iosize))
+			if (match_kstrtoint(args, 10, &iosize))
 				return -EINVAL;
 			iosizelog = ffs(iosize) - 1;
 			break;