block/backup: move in-flight requests handling from backup to block-copy

Move synchronization mechanism to block-copy, to be able to use one
block-copy instance from backup job and backup-top filter in parallel.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-id: 20191001131409.14202-2-vsementsov@virtuozzo.com
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>

1 files changed, 8 insertions, 0 deletions

diff --git a/include/block/block-copy.h b/include/block/block-copy.h
index 54f90d0c9a..962f91056a 100644
--- a/include/block/block-copy.h
+++ b/include/block/block-copy.h
@@ -17,6 +17,13 @@
 
 #include "block/block.h"
 
+typedef struct BlockCopyInFlightReq {
+    int64_t start_byte;
+    int64_t end_byte;
+    QLIST_ENTRY(BlockCopyInFlightReq) list;
+    CoQueue wait_queue; /* coroutines blocked on this request */
+} BlockCopyInFlightReq;
+
 typedef void (*ProgressBytesCallbackFunc)(int64_t bytes, void *opaque);
 typedef void (*ProgressResetCallbackFunc)(void *opaque);
 typedef struct BlockCopyState {
@@ -27,6 +34,7 @@ typedef struct BlockCopyState {
     bool use_copy_range;
     int64_t copy_range_size;
     uint64_t len;
+    QLIST_HEAD(, BlockCopyInFlightReq) inflight_reqs;
 
     BdrvRequestFlags write_flags;