[PATCH v12 04/10] btrfs-progs: receive: add send stream v2 cmds and attrs to send.h

[Omar Sandoval <osandov@osandov.com>]

From: Boris Burkov <boris@bur.io>

Send stream v2 adds three commands and several attributes associated to
those commands. Before we implement processing them, add all the
commands and attributes. This avoids leaving the enums in an
intermediate state that doesn't correspond to any version of send
stream.

Reviewed-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Boris Burkov <boris@bur.io>
---
 kernel-shared/send.h | 35 ++++++++++++++++++++++++++++++++++-
 1 file changed, 34 insertions(+), 1 deletion(-)

diff --git a/kernel-shared/send.h b/kernel-shared/send.h
index c8003aa5..1458dd29 100644
--- a/kernel-shared/send.h
+++ b/kernel-shared/send.h
@@ -34,7 +34,6 @@ extern "C" {
 #define BTRFS_SEND_STREAM_VERSION 1
 
 #define BTRFS_SEND_BUF_SIZE_V1 (64 * 1024)
-#define BTRFS_SEND_READ_SIZE (1024 * 48)
 
 enum btrfs_tlv_type {
 	BTRFS_TLV_U8,
@@ -70,6 +69,7 @@ struct btrfs_tlv_header {
 enum btrfs_send_cmd {
 	BTRFS_SEND_C_UNSPEC,
 
+	/* Version 1 */
 	BTRFS_SEND_C_SUBVOL,
 	BTRFS_SEND_C_SNAPSHOT,
 
@@ -98,6 +98,15 @@ enum btrfs_send_cmd {
 
 	BTRFS_SEND_C_END,
 	BTRFS_SEND_C_UPDATE_EXTENT,
+	BTRFS_SEND_C_MAX_V1 = BTRFS_SEND_C_UPDATE_EXTENT,
+
+	/* Version 2 */
+	BTRFS_SEND_C_FALLOCATE,
+	BTRFS_SEND_C_SETFLAGS,
+	BTRFS_SEND_C_ENCODED_WRITE,
+	BTRFS_SEND_C_MAX_V2 = BTRFS_SEND_C_ENCODED_WRITE,
+
+	/* End */
 	__BTRFS_SEND_C_MAX,
 };
 #define BTRFS_SEND_C_MAX (__BTRFS_SEND_C_MAX - 1)
@@ -106,6 +115,7 @@ enum btrfs_send_cmd {
 enum {
 	BTRFS_SEND_A_UNSPEC,
 
+	/* Version 1 */
 	BTRFS_SEND_A_UUID,
 	BTRFS_SEND_A_CTRANSID,
 
@@ -128,6 +138,11 @@ enum {
 	BTRFS_SEND_A_PATH_LINK,
 
 	BTRFS_SEND_A_FILE_OFFSET,
+	/*
+	 * In send stream v2, this attribute is special: it must be the last
+	 * attribute in a command, its header contains only the type, and its
+	 * length is implicitly the remaining length of the command.
+	 */
 	BTRFS_SEND_A_DATA,
 
 	BTRFS_SEND_A_CLONE_UUID,
@@ -135,7 +150,25 @@ enum {
 	BTRFS_SEND_A_CLONE_PATH,
 	BTRFS_SEND_A_CLONE_OFFSET,
 	BTRFS_SEND_A_CLONE_LEN,
+	BTRFS_SEND_A_MAX_V1 = BTRFS_SEND_A_CLONE_LEN,
 
+	/* Version 2 */
+	BTRFS_SEND_A_FALLOCATE_MODE,
+
+	BTRFS_SEND_A_SETFLAGS_FLAGS,
+
+	BTRFS_SEND_A_UNENCODED_FILE_LEN,
+	BTRFS_SEND_A_UNENCODED_LEN,
+	BTRFS_SEND_A_UNENCODED_OFFSET,
+	/*
+	 * COMPRESSION and ENCRYPTION default to NONE (0) if omitted from
+	 * BTRFS_SEND_C_ENCODED_WRITE.
+	 */
+	BTRFS_SEND_A_COMPRESSION,
+	BTRFS_SEND_A_ENCRYPTION,
+	BTRFS_SEND_A_MAX_V2 = BTRFS_SEND_A_ENCRYPTION,
+
+	/* End */
 	__BTRFS_SEND_A_MAX,
 };
 #define BTRFS_SEND_A_MAX (__BTRFS_SEND_A_MAX - 1)
-- 
2.34.0