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X-Received-From: 2607:f8b0:400e:c00::243 Subject: [Qemu-devel] [PATCH v4] migration/block: use blk_pwrite_zeroes for each zero cluster X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: famz@redhat.com, qemu-block@nongnu.org, quintela@redhat.com, dgilbert@redhat.com, stefanha@redhat.com, Lidong Chen Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" X-Virus-Scanned: ClamAV using ClamSMTP From: Lidong Chen BLOCK_SIZE is (1 << 20), qcow2 cluster size is 65536 by default, this maybe cause the qcow2 file size is bigger after migration. This patch check each cluster, use blk_pwrite_zeroes for each zero cluster. Signed-off-by: Lidong Chen Reviewed-by: Stefan Hajnoczi --- migration/block.c | 33 +++++++++++++++++++++++++++++++-- 1 file changed, 31 insertions(+), 2 deletions(-) diff --git a/migration/block.c b/migration/block.c index 7734ff7..5d0635a 100644 --- a/migration/block.c +++ b/migration/block.c @@ -885,6 +885,8 @@ static int block_load(QEMUFile *f, void *opaque, int version_id) int64_t total_sectors = 0; int nr_sectors; int ret; + BlockDriverInfo bdi; + int cluster_size; do { addr = qemu_get_be64(f); @@ -919,6 +921,15 @@ static int block_load(QEMUFile *f, void *opaque, int version_id) error_report_err(local_err); return -EINVAL; } + + ret = bdrv_get_info(blk_bs(blk), &bdi); + if (ret == 0 && bdi.cluster_size > 0 && + bdi.cluster_size <= BLOCK_SIZE && + BLOCK_SIZE % bdi.cluster_size == 0) { + cluster_size = bdi.cluster_size; + } else { + cluster_size = BLOCK_SIZE; + } } if (total_sectors - addr < BDRV_SECTORS_PER_DIRTY_CHUNK) { @@ -932,10 +943,28 @@ static int block_load(QEMUFile *f, void *opaque, int version_id) nr_sectors * BDRV_SECTOR_SIZE, BDRV_REQ_MAY_UNMAP); } else { + int i; + int64_t cur_addr; + uint8_t *cur_buf; + buf = g_malloc(BLOCK_SIZE); qemu_get_buffer(f, buf, BLOCK_SIZE); - ret = blk_pwrite(blk, addr * BDRV_SECTOR_SIZE, buf, - nr_sectors * BDRV_SECTOR_SIZE, 0); + for (i = 0; i < BLOCK_SIZE / cluster_size; i++) { + cur_addr = addr * BDRV_SECTOR_SIZE + i * cluster_size; + cur_buf = buf + i * cluster_size; + + if (buffer_is_zero(cur_buf, cluster_size)) { + ret = blk_pwrite_zeroes(blk, cur_addr, + cluster_size, + BDRV_REQ_MAY_UNMAP); + } else { + ret = blk_pwrite(blk, cur_addr, cur_buf, + cluster_size, 0); + } + if (ret < 0) { + break; + } + } g_free(buf); }