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.
This patch doesn't add SUPER_FLAG_CHANGING_FSID into BTRFS_SUPER_FLAG_SUPP
list, so mount would fail (along with the fix in the next patch) when
SUPER_FLAG_CHANGING_FSID is set.
Signed-off-by: Anand Jain <anand.jain@xxxxxxxxxx>
cc: wqu@xxxxxxxx
Reviewed-by: Qu Wenruo <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
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