On 07.08.18 19:43, Vladimir Sementsov-Ogievskiy wrote: > We don't need locking for encryption code. > > Signed-off-by: Vladimir Sementsov-Ogievskiy <vsement...@virtuozzo.com> > --- > 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;
There are a couple more failure places in between that probably need a re-locking. Otherwise, the patch looks good. Max > } > } > > + qemu_co_mutex_lock(&s->lock); > + > ret = qcow2_handle_l2meta(bs, &l2meta, true); > if (ret) { > goto fail; >
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