Qcow2 allocates new clusters after the end of the file. If it is the destinaton of copy offloading, we must adjust dst->bs->total_sectors. Otherwise, further reads will drop to the "beyond EOF" code path and return zeroes, which problem is caught by iotests 222.
Follow the logic in the normal write code and update bs->total_sectors after I/O is done. While at it, add a few convenient trace points to aid future debug experiences in the topic. Fam Zheng (9): block: Add copy offloading trace points block: Use BdrvChild to discard block: Use uint64_t for BdrvTrackedRequest byte fields block: Extract common write req handling block: Fix handling of image enlarging write block: Use common req handling for discard block: Use common req handling in copy offloading block: Fix bdrv_co_truncate overlap check block: Use common write req handling in truncate block/blkdebug.c | 2 +- block/blkreplay.c | 2 +- block/block-backend.c | 2 +- block/copy-on-read.c | 2 +- block/file-posix.c | 2 + block/io.c | 163 +++++++++++++++++++++++++------------- block/iscsi.c | 3 + block/mirror.c | 2 +- block/qcow2-refcount.c | 2 +- block/raw-format.c | 2 +- block/throttle.c | 2 +- block/trace-events | 6 ++ include/block/block.h | 4 +- include/block/block_int.h | 4 +- 14 files changed, 130 insertions(+), 68 deletions(-) -- 2.17.1
