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Subject[PATCH] btrfs: re-instantiate the removed BTRFS_SUBVOL_CREATE_ASYNC definition
The commit 9c1036fdb1d1ff1b ("btrfs: Remove BTRFS_SUBVOL_CREATE_ASYNC
support") breaks strace build with the kernel headers from git:

btrfs.c: In function "btrfs_test_subvol_ioctls":
btrfs.c:531:23: error: "BTRFS_SUBVOL_CREATE_ASYNC" undeclared (first use
in this function)
vol_args_v2.flags = BTRFS_SUBVOL_CREATE_ASYNC;

Moreover, it is improper to break UAPI anyway.

Restore the macro definition and put it under "#ifndef __KERNEL__"
in order to prevent inadvertent in-kernel usage.

Fixes: 9c1036fdb1d1ff1b ("btrfs: Remove BTRFS_SUBVOL_CREATE_ASYNC support")
Signed-off-by: Eugene Syromiatnikov <esyr@redhat.com>
---
include/uapi/linux/btrfs.h | 10 ++++------
1 file changed, 4 insertions(+), 6 deletions(-)

diff --git a/include/uapi/linux/btrfs.h b/include/uapi/linux/btrfs.h
index 8134924..e6b6cb0f 100644
--- a/include/uapi/linux/btrfs.h
+++ b/include/uapi/linux/btrfs.h
@@ -36,12 +36,10 @@ struct btrfs_ioctl_vol_args {
#define BTRFS_DEVICE_PATH_NAME_MAX 1024
#define BTRFS_SUBVOL_NAME_MAX 4039

-/*
- * Deprecated since 5.7:
- *
- * BTRFS_SUBVOL_CREATE_ASYNC (1ULL << 0)
- */
-
+#ifndef __KERNEL__
+/* Deprecated since 5.7 */
+# define BTRFS_SUBVOL_CREATE_ASYNC (1ULL << 0)
+#endif
#define BTRFS_SUBVOL_RDONLY (1ULL << 1)
#define BTRFS_SUBVOL_QGROUP_INHERIT (1ULL << 2)

--
2.1.4
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