From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:42937) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1fn60u-0007Ti-5u for qemu-devel@nongnu.org; Tue, 07 Aug 2018 13:43:21 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1fn60r-00021d-A5 for qemu-devel@nongnu.org; Tue, 07 Aug 2018 13:43:20 -0400 From: Vladimir Sementsov-Ogievskiy Date: Tue, 7 Aug 2018 20:43:06 +0300 Message-Id: <20180807174311.32454-3-vsementsov@virtuozzo.com> In-Reply-To: <20180807174311.32454-1-vsementsov@virtuozzo.com> References: <20180807174311.32454-1-vsementsov@virtuozzo.com> Subject: [Qemu-devel] [PATCH 2/7] qcow2: bdrv_co_pwritev: move encryption code out of lock List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: qemu-devel@nongnu.org, qemu-block@nongnu.org Cc: mreitz@redhat.com, kwolf@redhat.com, vsementsov@virtuozzo.com, den@openvz.org We don't need locking for encryption code. Signed-off-by: Vladimir Sementsov-Ogievskiy --- block/qcow2.c | 20 ++++++++++++-------- 1 file changed, 12 insertions(+), 8 deletions(-) diff --git a/block/qcow2.c b/block/qcow2.c index 41def07c67..65e3ca00e2 100644 --- a/block/qcow2.c +++ b/block/qcow2.c @@ -2039,6 +2039,15 @@ static coroutine_fn int qcow2_co_pwritev(BlockDriverState *bs, uint64_t offset, assert((cluster_offset & 511) == 0); + ret = qcow2_pre_write_overlap_check(bs, 0, + cluster_offset + offset_in_cluster, + cur_bytes); + if (ret < 0) { + goto fail; + } + + qemu_co_mutex_unlock(&s->lock); + qemu_iovec_reset(&hd_qiov); qemu_iovec_concat(&hd_qiov, qiov, bytes_done, cur_bytes); @@ -2072,30 +2081,25 @@ static coroutine_fn int qcow2_co_pwritev(BlockDriverState *bs, uint64_t offset, qemu_iovec_add(&hd_qiov, cluster_data, cur_bytes); } - ret = qcow2_pre_write_overlap_check(bs, 0, - cluster_offset + offset_in_cluster, cur_bytes); - if (ret < 0) { - goto fail; - } - /* If we need to do COW, check if it's possible to merge the * writing of the guest data together with that of the COW regions. * If it's not possible (or not necessary) then write the * guest data now. */ if (!merge_cow(offset, cur_bytes, &hd_qiov, l2meta)) { - qemu_co_mutex_unlock(&s->lock); BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO); trace_qcow2_writev_data(qemu_coroutine_self(), cluster_offset + offset_in_cluster); ret = bdrv_co_pwritev(bs->file, cluster_offset + offset_in_cluster, cur_bytes, &hd_qiov, 0); - qemu_co_mutex_lock(&s->lock); if (ret < 0) { + qemu_co_mutex_lock(&s->lock); goto fail; } } + qemu_co_mutex_lock(&s->lock); + ret = qcow2_handle_l2meta(bs, &l2meta, true); if (ret) { goto fail; -- 2.11.1