diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 3f704a816137..11115847d875 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -2388,7 +2388,6 @@ void btrfs_sysfs_del_super(struct btrfs_fs_info *root);
 ssize_t btrfs_listxattr(struct dentry *dentry, char *buffer, size_t size);
 
 /* super.c */
-u64 btrfs_parse_size(char *str);
 int btrfs_parse_options(struct btrfs_root *root, char *options);
 int btrfs_sync_fs(struct super_block *sb, int wait);
 
diff --git a/fs/btrfs/ioctl.c b/fs/btrfs/ioctl.c
index 9213d39d36cc..363e209679b6 100644
--- a/fs/btrfs/ioctl.c
+++ b/fs/btrfs/ioctl.c
@@ -776,7 +776,7 @@ static noinline int btrfs_ioctl_resize(struct btrfs_root *root,
 			mod = 1;
 			sizestr++;
 		}
-		new_size = btrfs_parse_size(sizestr);
+		new_size = memparse(sizestr, NULL);
 		if (new_size == 0) {
 			ret = -EINVAL;
 			goto out_unlock;
diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index ff3dd55f294d..9ac612e6ca60 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -96,31 +96,6 @@ static match_table_t tokens = {
 	{Opt_err, NULL},
 };
 
-u64 btrfs_parse_size(char *str)
-{
-	u64 res;
-	int mult = 1;
-	char *end;
-	char last;
-
-	res = simple_strtoul(str, &end, 10);
-
-	last = end[0];
-	if (isalpha(last)) {
-		last = tolower(last);
-		switch (last) {
-		case 'g':
-			mult *= 1024;
-		case 'm':
-			mult *= 1024;
-		case 'k':
-			mult *= 1024;
-		}
-		res = res * mult;
-	}
-	return res;
-}
-
 /*
  * Regular mount options parser.  Everything that is needed only when
  * reading in a new superblock is parsed here.
@@ -216,7 +191,7 @@ int btrfs_parse_options(struct btrfs_root *root, char *options)
 		case Opt_max_extent:
 			num = match_strdup(&args[0]);
 			if (num) {
-				info->max_extent = btrfs_parse_size(num);
+				info->max_extent = memparse(num, NULL);
 				kfree(num);
 
 				info->max_extent = max_t(u64,
@@ -228,7 +203,7 @@ int btrfs_parse_options(struct btrfs_root *root, char *options)
 		case Opt_max_inline:
 			num = match_strdup(&args[0]);
 			if (num) {
-				info->max_inline = btrfs_parse_size(num);
+				info->max_inline = memparse(num, NULL);
 				kfree(num);
 
 				if (info->max_inline) {
@@ -243,7 +218,7 @@ int btrfs_parse_options(struct btrfs_root *root, char *options)
 		case Opt_alloc_start:
 			num = match_strdup(&args[0]);
 			if (num) {
-				info->alloc_start = btrfs_parse_size(num);
+				info->alloc_start = memparse(num, NULL);
 				kfree(num);
 				printk(KERN_INFO
 					"btrfs: allocations start at %llu\n",