Btrfs: use u64 for subvolid when parsing mount options

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>
Signed-off-by: Josef Bacik <jbacik@fusionio.com>
Signed-off-by: Chris Mason <chris.mason@fusionio.com>

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index cc00295..d82391d 100644 (file)
--- 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;