block/block-copy: allocate buffer in block_copy_with_bounce_buffer
commit3816edd2cb8391a782bde365d7f14705fdb2834d
authorVladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Tue, 22 Oct 2019 11:18:00 +0000 (22 14:18 +0300)
committerMax Reitz <mreitz@redhat.com>
Mon, 28 Oct 2019 10:22:31 +0000 (28 11:22 +0100)
treefbcb378357f4625b0dd9f119dc15a3c5e74b743b
parentecc47cb47ccd3da0ad1375d2696997192f953ca3
block/block-copy: allocate buffer in block_copy_with_bounce_buffer

Move bounce_buffer allocation block_copy_with_bounce_buffer. This
commit simplifies further work on implementing copying by larger chunks
(of different size) and further asynchronous handling of block_copy
iterations (with help of block/aio_task API).

Allocation works fast, a lot faster than disk io, so it's not a problem
that we now allocate/free bounce_buffer more times. And we anyway will
have to allocate several bounce_buffers for parallel execution of loop
iterations in future.

Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Message-id: 20191022111805.3432-2-vsementsov@virtuozzo.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
block/block-copy.c