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From: Alberto Garcia To: qemu-devel@nongnu.org Date: Wed, 6 Mar 2019 20:11:04 +0200 Message-Id: X-Mailer: git-send-email 2.11.0 In-Reply-To: References: In-Reply-To: References: X-detected-operating-system: by eggs.gnu.org: GNU/Linux 2.2.x-3.x (no timestamps) [generic] [fuzzy] X-Received-From: 91.117.99.155 Subject: [Qemu-devel] [PATCH v2 04/13] block: Freeze the backing chain for the duration of the stream job 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: Kevin Wolf , Alberto Garcia , qemu-block@nongnu.org, Max Reitz Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: fail (Header signature does not verify) Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Signed-off-by: Alberto Garcia --- block/stream.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/block/stream.c b/block/stream.c index e14579ff80..6253c86fae 100644 --- a/block/stream.c +++ b/block/stream.c @@ -35,6 +35,7 @@ typedef struct StreamBlockJob { BlockdevOnError on_error; char *backing_file_str; bool bs_read_only; + bool chain_frozen; } StreamBlockJob; =20 static int coroutine_fn stream_populate(BlockBackend *blk, @@ -49,6 +50,16 @@ static int coroutine_fn stream_populate(BlockBackend *bl= k, return blk_co_preadv(blk, offset, qiov.size, &qiov, BDRV_REQ_COPY_ON_R= EAD); } =20 +static void stream_abort(Job *job) +{ + StreamBlockJob *s =3D container_of(job, StreamBlockJob, common.job); + + if (s->chain_frozen) { + BlockJob *bjob =3D &s->common; + bdrv_unfreeze_backing_chain(blk_bs(bjob->blk), s->base); + } +} + static int stream_prepare(Job *job) { StreamBlockJob *s =3D container_of(job, StreamBlockJob, common.job); @@ -58,6 +69,9 @@ static int stream_prepare(Job *job) Error *local_err =3D NULL; int ret =3D 0; =20 + bdrv_unfreeze_backing_chain(bs, base); + s->chain_frozen =3D false; + if (bs->backing) { const char *base_id =3D NULL, *base_fmt =3D NULL; if (base) { @@ -208,6 +222,7 @@ static const BlockJobDriver stream_job_driver =3D { .free =3D block_job_free, .run =3D stream_run, .prepare =3D stream_prepare, + .abort =3D stream_abort, .clean =3D stream_clean, .user_resume =3D block_job_user_resume, .drain =3D block_job_drain, @@ -254,9 +269,15 @@ void stream_start(const char *job_id, BlockDriverState= *bs, &error_abort); } =20 + if (bdrv_freeze_backing_chain(bs, base, errp) < 0) { + job_early_fail(&s->common.job); + goto fail; + } + s->base =3D base; s->backing_file_str =3D g_strdup(backing_file_str); s->bs_read_only =3D bs_read_only; + s->chain_frozen =3D true; =20 s->on_error =3D on_error; trace_stream_start(bs, base, s); --=20 2.11.0