Userland sets SUPER_FLAG_CHANGING_FSID and resets it only when changing
fsid is complete. Its not a good idea to mount the device anything in
between, so this patch fails the mount if SB SUPER_FLAG_CHANGING_FSID
is set. As we don't add SUPER_FLAG_CHANGING_FSID into
BTRFS_SUPER_FLAG_SUPP list, so mount will fail if SUPER_FLAG_CHANGING_FSID
is set in the user land.
Signed-off-by: Anand Jain <anand.jain@xxxxxxxxxx>
cc: wqu@xxxxxxxx
---
include/uapi/linux/btrfs_tree.h | 1 +
1 file changed, 1 insertion(+)
diff --git a/include/uapi/linux/btrfs_tree.h b/include/uapi/linux/btrfs_tree.h
index 38ab0e06259a..aff1356c2bb8 100644
--- a/include/uapi/linux/btrfs_tree.h
+++ b/include/uapi/linux/btrfs_tree.h
@@ -457,6 +457,7 @@ struct btrfs_free_space_header {
#define BTRFS_SUPER_FLAG_SEEDING (1ULL << 32)
#define BTRFS_SUPER_FLAG_METADUMP (1ULL << 33)
#define BTRFS_SUPER_FLAG_METADUMP_V2 (1ULL << 34)
+#define BTRFS_SUPER_FLAG_CHANGING_FSID (1ULL << 35)
/*
--
2.15.0
--
To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
