[PATCHv2 1/4] btrfs-progs: add IOC_SNAP_DESTROY_V2 to ioctl.h

[Marcos Paulo de Souza <marcos.souza.org@gmail.com>]

From: Marcos Paulo de Souza <mpdesouza@suse.com>

This ioctl will make possible to delete a subvolume/snapshot by using
the subvolume id.

Signed-off-by: Marcos Paulo de Souza <mpdesouza@suse.com>
---

Changes from v1:
* Moved subvolid member to the same union containing name and devid (David)
* Changed BTRFS_SUBVOL_DELETE_BY_ID to BTRFS_SUBVOL_SPEC_BY_ID (David,
  Christoph)

 ioctl.h | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/ioctl.h b/ioctl.h
index 1d53c100..1a2882df 100644
--- a/ioctl.h
+++ b/ioctl.h
@@ -53,12 +53,14 @@ BUILD_ASSERT(sizeof(struct btrfs_ioctl_vol_args) == 4096);
 #define BTRFS_SUBVOL_RDONLY		(1ULL << 1)
 #define BTRFS_SUBVOL_QGROUP_INHERIT	(1ULL << 2)
 #define BTRFS_DEVICE_SPEC_BY_ID		(1ULL << 3)
+#define BTRFS_SUBVOL_SPEC_BY_ID		(1ULL << 4)
 
 #define BTRFS_VOL_ARG_V2_FLAGS_SUPPORTED		\
 			(BTRFS_SUBVOL_CREATE_ASYNC |	\
 			BTRFS_SUBVOL_RDONLY |		\
 			BTRFS_SUBVOL_QGROUP_INHERIT |	\
-			BTRFS_DEVICE_SPEC_BY_ID)
+			BTRFS_DEVICE_SPEC_BY_ID |	\
+			BTRFS_SUBVOL_SPEC_BY_ID)
 
 #define BTRFS_FSID_SIZE 16
 #define BTRFS_UUID_SIZE 16
@@ -104,6 +106,7 @@ struct btrfs_ioctl_vol_args_v2 {
 	};
 	union {
 		char name[BTRFS_SUBVOL_NAME_MAX + 1];
+		__u64 subvolid;
 		__u64 devid;
 	};
 };
@@ -940,6 +943,9 @@ static inline char *btrfs_err_str(enum btrfs_err_code err_code)
 				struct btrfs_ioctl_get_subvol_rootref_args)
 #define BTRFS_IOC_INO_LOOKUP_USER _IOWR(BTRFS_IOCTL_MAGIC, 62, \
 				struct btrfs_ioctl_ino_lookup_user_args)
+#define BTRFS_IOC_SNAP_DESTROY_V2 _IOW(BTRFS_IOCTL_MAGIC, 63, \
+				   struct btrfs_ioctl_vol_args_v2)
+
 #ifdef __cplusplus
 }
 #endif
-- 
2.24.0