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-rw-r--r--fs/btrfs/send.c24
-rw-r--r--include/uapi/linux/btrfs.h20
2 files changed, 33 insertions, 11 deletions
diff --git a/fs/btrfs/send.c b/fs/btrfs/send.c
index c85e7c6b4598..e0c69a106c77 100644
--- a/fs/btrfs/send.c
+++ b/fs/btrfs/send.c
@@ -4529,9 +4529,11 @@ static int send_subvol(struct send_ctx *sctx)
{
int ret;
- ret = send_header(sctx);
- if (ret < 0)
- goto out;
+ if (!(sctx->flags & BTRFS_SEND_FLAG_OMIT_STREAM_HEADER)) {
+ ret = send_header(sctx);
+ if (ret < 0)
+ goto out;
+ }
ret = send_subvol_begin(sctx);
if (ret < 0)
@@ -4593,7 +4595,7 @@ long btrfs_ioctl_send(struct file *mnt_file, void __user *arg_)
goto out;
}
- if (arg->flags & ~BTRFS_SEND_FLAG_NO_FILE_DATA) {
+ if (arg->flags & ~BTRFS_SEND_FLAG_MASK) {
ret = -EINVAL;
goto out;
}
@@ -4704,12 +4706,14 @@ long btrfs_ioctl_send(struct file *mnt_file, void __user *arg_)
if (ret < 0)
goto out;
- ret = begin_cmd(sctx, BTRFS_SEND_C_END);
- if (ret < 0)
- goto out;
- ret = send_cmd(sctx);
- if (ret < 0)
- goto out;
+ if (!(sctx->flags & BTRFS_SEND_FLAG_OMIT_END_CMD)) {
+ ret = begin_cmd(sctx, BTRFS_SEND_C_END);
+ if (ret < 0)
+ goto out;
+ ret = send_cmd(sctx);
+ if (ret < 0)
+ goto out;
+ }
out:
kfree(arg);
diff --git a/include/uapi/linux/btrfs.h b/include/uapi/linux/btrfs.h
index fa3a5f9338fc..5e39e859a848 100644
--- a/include/uapi/linux/btrfs.h
+++ b/include/uapi/linux/btrfs.h
@@ -412,7 +412,25 @@ struct btrfs_ioctl_received_subvol_args {
* search of clone sources doesn't find an extent. UPDATE_EXTENT
* commands will be sent instead of WRITE commands.
*/
-#define BTRFS_SEND_FLAG_NO_FILE_DATA 0x1
+#define BTRFS_SEND_FLAG_NO_FILE_DATA 0x1
+
+/*
+ * Do not add the leading stream header. Used when multiple snapshots
+ * are sent back to back.
+ */
+#define BTRFS_SEND_FLAG_OMIT_STREAM_HEADER 0x2
+
+/*
+ * Omit the command at the end of the stream that indicated the end
+ * of the stream. This option is used when multiple snapshots are
+ * sent back to back.
+ */
+#define BTRFS_SEND_FLAG_OMIT_END_CMD 0x4
+
+#define BTRFS_SEND_FLAG_MASK \
+ (BTRFS_SEND_FLAG_NO_FILE_DATA | \
+ BTRFS_SEND_FLAG_OMIT_STREAM_HEADER | \
+ BTRFS_SEND_FLAG_OMIT_END_CMD)
struct btrfs_ioctl_send_args {
__s64 send_fd; /* in */
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