[PATCH v14 7/7] btrfs: send: enable support for stream v2 and compressed writes

Omar Sandoval
2022-03-17T17:26:17Z

From: Omar Sandoval <osandov@fb.com>

Now that the new support is implemented, allow the ioctl to accept v2
and the compressed flag, and update the version in sysfs.

Signed-off-by: Omar Sandoval <osandov@fb.com>
---
fs/btrfs/send.c | 7 +++++--
fs/btrfs/send.h | 2 +-
include/uapi/linux/btrfs.h | 3 ++-
3 files changed, 8 insertions(+), 4 deletions(-)

diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
index b0560be3053b..4567271ce642 100644
--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -690,8 +690,7 @@ static int send_header(struct send_ctx *sctx)
struct btrfs_stream_header hdr;

strcpy(hdr.magic, BTRFS_SEND_STREAM_MAGIC);
- hdr.version = cpu_to_le32(BTRFS_SEND_STREAM_VERSION);
-
+ hdr.version = cpu_to_le32(sctx->proto);
return write_buf(sctx->send_filp, &hdr, sizeof(hdr),
&sctx->send_off);
}
@@ -7663,6 +7662,10 @@ long btrfs_ioctl_send(struct inode *inode, struct btrfs_ioctl_send_args *arg)
} else {
sctx->proto = 1;
}
+ if ((arg->flags & BTRFS_SEND_FLAG_COMPRESSED) && sctx->proto < 2) {
+ ret = -EINVAL;
+ goto out;
+ }

sctx->send_filp = fget(arg->send_fd);
if (!sctx->send_filp) {
diff --git a/fs/btrfs/send.h b/fs/btrfs/send.h
index 805d8095209a..50a2aceae929 100644
--- a/fs/btrfs/send.h
+++ b/fs/btrfs/send.h
@@ -10,7 +10,7 @@
#include "ctree.h"

#define BTRFS_SEND_STREAM_MAGIC "btrfs-stream"
-#define BTRFS_SEND_STREAM_VERSION 1
+#define BTRFS_SEND_STREAM_VERSION 2

/*
* In send stream v1, no command is larger than 64k. In send stream v2, no limit
diff --git a/include/uapi/linux/btrfs.h b/include/uapi/linux/btrfs.h
index b6f26a434b10..f54dc91e4025 100644
--- a/include/uapi/linux/btrfs.h
+++ b/include/uapi/linux/btrfs.h
@@ -788,7 +788,8 @@ struct btrfs_ioctl_received_subvol_args {
(BTRFS_SEND_FLAG_NO_FILE_DATA | \
BTRFS_SEND_FLAG_OMIT_STREAM_HEADER | \
BTRFS_SEND_FLAG_OMIT_END_CMD | \
- BTRFS_SEND_FLAG_VERSION)
+ BTRFS_SEND_FLAG_VERSION | \
+ BTRFS_SEND_FLAG_COMPRESSED)

struct btrfs_ioctl_send_args {
__s64 send_fd; /* in */
--
2.35.1