btrfs-progs: send-stream: track the read position in the stream

Can be later used for more precise error reporting.

Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/send-stream.c b/send-stream.c
index 80bf680..920c742 100644 (file)
--- a/send-stream.c
+++ b/send-stream.c
@@ -33,6 +33,12 @@ struct btrfs_send_stream {
        struct btrfs_tlv_header *cmd_attrs[BTRFS_SEND_A_MAX + 1];
        u32 version;
 
+       /*
+        * end of last successful read, equivalent to start of current
+        * malformated part of block
+        */
+       size_t stream_pos;
+
        struct btrfs_send_ops *ops;
        void *user;
 };
@@ -71,6 +77,8 @@ out_eof:
        if (pos < len) {
                error("short read from stream: expected %zu read %zu", len, pos);
                ret = -EIO;
+       } else {
+               sctx->stream_pos += pos;
        }
 
 out:
@@ -478,6 +486,7 @@ int btrfs_read_and_process_send_stream(int fd,
        sctx.fd = fd;
        sctx.ops = ops;
        sctx.user = user;
+       sctx.stream_pos = 0;
 
        ret = read_buf(&sctx, (char*)&hdr, sizeof(hdr));
        if (ret < 0)