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TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id 6DB0B30860A7; Tue, 30 Jul 2019 18:28:52 +0000 (UTC) Received: from [10.18.17.211] (dhcp-17-211.bos.redhat.com [10.18.17.211]) by smtp.corp.redhat.com (Postfix) with ESMTP id 24C955D9C8; Tue, 30 Jul 2019 18:28:51 +0000 (UTC) To: Vladimir Sementsov-Ogievskiy , qemu-block@nongnu.org References: <20190730163251.755248-1-vsementsov@virtuozzo.com> <20190730163251.755248-4-vsementsov@virtuozzo.com> From: John Snow Openpgp: preference=signencrypt Autocrypt: addr=jsnow@redhat.com; prefer-encrypt=mutual; keydata= mQINBFTKefwBEAChvwqYC6saTzawbih87LqBYq0d5A8jXYXaiFMV/EvMSDqqY4EY6whXliNO IYzhgrPEe7ZmPxbCSe4iMykjhwMh5byIHDoPGDU+FsQty2KXuoxto+ZdrP9gymAgmyqdk3aV vzzmCa3cOppcqKvA0Kqr10UeX/z4OMVV390V+DVWUvzXpda45/Sxup57pk+hyY52wxxjIqef rj8u5BN93s5uCVTus0oiVA6W+iXYzTvVDStMFVqnTxSxlpZoH5RGKvmoWV3uutByQyBPHW2U 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rCDQYyakH2tJNQgkXkeLodBKF4bHiBbuwj0E39S9wmGgg+q4OTnAO/yhQGknle7a7G5xHBwE i0HjnLoJP5jDcoMTabZTIazXmJz3pKM11HYJ5/ZsTIf3ZRJJKIvXJpbmcAPVwTZII6XxiJdh RSSX4Mvd5pL/+5WI6NTdW6DMfigTtdd85fe6PwBNVJL2ZvBfsBJZ5rxg1TOH3KLsYBqBTgW2 glQofxhkJhDEcvjLhe3Y2BlbCWKOmvM8XS9TRt0OwUs= Message-ID: <2b034619-ab55-a5f1-a1f4-ea14c4c5c18c@redhat.com> Date: Tue, 30 Jul 2019 14:28:50 -0400 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.8.0 MIME-Version: 1.0 In-Reply-To: <20190730163251.755248-4-vsementsov@virtuozzo.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.14 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.44]); Tue, 30 Jul 2019 18:28:52 +0000 (UTC) X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x [generic] X-Received-From: 209.132.183.28 Subject: Re: [Qemu-devel] [PATCH 3/3] block/backup: refactor write_flags X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: kwolf@redhat.com, den@openvz.org, mreitz@redhat.com, armbru@redhat.com, qemu-devel@nongnu.org Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 7/30/19 12:32 PM, Vladimir Sementsov-Ogievskiy wrote: > write flags are constant, let's store it in BackupBlockJob instead of > recalculating. It also makes two boolean fields to be unused, so, > drop them. > > Signed-off-by: Vladimir Sementsov-Ogievskiy > --- > block/backup.c | 24 ++++++++++++------------ > 1 file changed, 12 insertions(+), 12 deletions(-) > > diff --git a/block/backup.c b/block/backup.c > index c5f941101a..4651649e9d 100644 > --- a/block/backup.c > +++ b/block/backup.c > @@ -47,7 +47,6 @@ typedef struct BackupBlockJob { > uint64_t len; > uint64_t bytes_read; > int64_t cluster_size; > - bool compress; > NotifierWithReturn before_write; > QLIST_HEAD(, CowRequest) inflight_reqs; > > @@ -55,7 +54,7 @@ typedef struct BackupBlockJob { > bool use_copy_range; > int64_t copy_range_size; > > - bool serialize_target_writes; > + BdrvRequestFlags write_flags; > } BackupBlockJob; > > static const BlockJobDriver backup_job_driver; > @@ -110,10 +109,6 @@ static int coroutine_fn backup_cow_with_bounce_buffer(BackupBlockJob *job, > BlockBackend *blk = job->common.blk; > int nbytes; > int read_flags = is_write_notifier ? BDRV_REQ_NO_SERIALISING : 0; > - int write_flags = > - (job->serialize_target_writes ? BDRV_REQ_SERIALISING : 0) | > - (job->compress ? BDRV_REQ_WRITE_COMPRESSED : 0); > - > > assert(QEMU_IS_ALIGNED(start, job->cluster_size)); > hbitmap_reset(job->copy_bitmap, start, job->cluster_size); > @@ -132,7 +127,7 @@ static int coroutine_fn backup_cow_with_bounce_buffer(BackupBlockJob *job, > } > > ret = blk_co_pwrite(job->target, start, nbytes, *bounce_buffer, > - write_flags); > + job->write_flags); > if (ret < 0) { > trace_backup_do_cow_write_fail(job, start, ret); > if (error_is_read) { > @@ -160,7 +155,6 @@ static int coroutine_fn backup_cow_with_offload(BackupBlockJob *job, > BlockBackend *blk = job->common.blk; > int nbytes; > int read_flags = is_write_notifier ? BDRV_REQ_NO_SERIALISING : 0; > - int write_flags = job->serialize_target_writes ? BDRV_REQ_SERIALISING : 0; > > assert(QEMU_IS_ALIGNED(job->copy_range_size, job->cluster_size)); > assert(QEMU_IS_ALIGNED(start, job->cluster_size)); > @@ -168,7 +162,7 @@ static int coroutine_fn backup_cow_with_offload(BackupBlockJob *job, > nr_clusters = DIV_ROUND_UP(nbytes, job->cluster_size); > hbitmap_reset(job->copy_bitmap, start, job->cluster_size * nr_clusters); > ret = blk_co_copy_range(blk, start, job->target, start, nbytes, > - read_flags, write_flags); > + read_flags, job->write_flags); > if (ret < 0) { > trace_backup_do_cow_copy_range_fail(job, start, ret); > hbitmap_set(job->copy_bitmap, start, job->cluster_size * nr_clusters); > @@ -638,10 +632,16 @@ BlockJob *backup_job_create(const char *job_id, BlockDriverState *bs, > job->sync_mode = sync_mode; > job->sync_bitmap = sync_mode == MIRROR_SYNC_MODE_INCREMENTAL ? > sync_bitmap : NULL; > - job->compress = compress; > > - /* Detect image-fleecing (and similar) schemes */ > - job->serialize_target_writes = bdrv_chain_contains(target, bs); > + /* > + * Set write flags: > + * 1. Detect image-fleecing (and similar) schemes > + * 2. Handle compression > + */ > + job->write_flags = > + (bdrv_chain_contains(target, bs) ? BDRV_REQ_SERIALISING : 0) | > + (compress ? BDRV_REQ_WRITE_COMPRESSED : 0); > + > job->cluster_size = cluster_size; > job->copy_bitmap = copy_bitmap; > copy_bitmap = NULL; > What happens if you did pass BDRV_REQ_WRITE_COMPRESSED to blk_co_copy_range? Is that rejected somewhere in the stack? I had just assumed it wouldn't work quite right because of the nature of copy offloading, but I don't actually know what it does do. This seems like a pretty minor cleanup, but why not. I like dropping extra fields when I can: Reviewed-by: John Snow