[PATCH 2/3] Btrfs: use u64 for subvolid when parsing mount options

[PATCH 2/3] Btrfs: use u64 for subvolid when parsing mount options

[Wang Shilong]

Although for most time, int is enough for subvolid, we should
ensure safety in theory.

Signed-off-by: Wang Shilong<wangsl.fnst@cn.fujitsu.com>
Reviewed-by: Miao Xie<miaox@cn.fujitsu.com>
---
  fs/btrfs/super.c | 16 +++++++---------
  1 file changed, 7 insertions(+), 9 deletions(-)

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index cc00295..d82391d 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -327,7 +327,7 @@ enum {
  static match_table_t tokens = {
  	{Opt_degraded, "degraded"},
  	{Opt_subvol, "subvol=%s"},
-	{Opt_subvolid, "subvolid=%d"},
+	{Opt_subvolid, "subvolid=%s"},
  	{Opt_device, "device=%s"},
  	{Opt_nodatasum, "nodatasum"},
  	{Opt_nodatacow, "nodatacow"},
@@ -673,8 +673,8 @@ static int btrfs_parse_early_options(const char *options, fmode_t flags,
  {
  	substring_t args[MAX_OPT_ARGS];
  	char *device_name, *opts, *orig, *p;
+	char *num = NULL;
  	int error = 0;
-	int intarg;
  
  	if (!options)
  		return 0;
@@ -704,16 +704,14 @@ static int btrfs_parse_early_options(const char *options, fmode_t flags,
  			}
  			break;
  		case Opt_subvolid:
-			error = match_int(&args[0], &intarg);
-			if (!error) {
-				goto out;
-			} else if (intarg >= 0) {
+			num = match_strdup(&args[0]);
+			if (num) {
+				*subvol_objectid = memparse(num, NULL);
+				kfree(num);
  				/* we want the original fs_tree */
-				if (!intarg)
+				if (!*subvol_objectid)
  					*subvol_objectid =
  						BTRFS_FS_TREE_OBJECTID;
-				else
-					*subvol_objectid = intarg;
  			} else {
  				error = -EINVAL;
  				goto out;
-- 1.8.0.1