On 2018年01月08日 16:04, Anand Jain wrote:
> 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
Reviewed-by: Qu Wenruo <wqu@xxxxxxxx>
Thanks,
Qu
> ---
> 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)
>
>
> /*
>
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