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envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=40.107.7.117; envelope-from=vsementsov@virtuozzo.com; helo=EUR04-HE1-obe.outbound.protection.outlook.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/01 14:11:40 X-ACL-Warn: Detected OS = Windows NT kernel [generic] [fuzzy] X-Spam_score_int: -27 X-Spam_score: -2.8 X-Spam_bar: -- X-Spam_report: (-2.8 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, MSGID_FROM_MTA_HEADER=0.001, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_PASS=-0.001, SPF_PASS=-0.001, URIBL_BLOCKED=0.001 autolearn=_AUTOLEARN X-Spam_action: no action 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, vsementsov@virtuozzo.com, qemu-devel@nongnu.org, wencongyang2@huawei.com, xiechanglong.d@gmail.com, armbru@redhat.com, mreitz@redhat.com, den@openvz.org, jsnow@redhat.com Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: "Qemu-devel" X-ZohoMail-DKIM: pass (identity @virtuozzo.com) Content-Type: text/plain; charset="utf-8" Add function to cancel running async block-copy call. It will be used in backup. Signed-off-by: Vladimir Sementsov-Ogievskiy --- include/block/block-copy.h | 7 +++++++ block/block-copy.c | 22 +++++++++++++++++++--- 2 files changed, 26 insertions(+), 3 deletions(-) diff --git a/include/block/block-copy.h b/include/block/block-copy.h index d40e691123..370a194d3c 100644 --- a/include/block/block-copy.h +++ b/include/block/block-copy.h @@ -67,6 +67,13 @@ BlockCopyCallState *block_copy_async(BlockCopyState *s, void block_copy_set_speed(BlockCopyState *s, BlockCopyCallState *call_stat= e, uint64_t speed); =20 +/* + * Cancel running block-copy call. + * Cancel leaves block-copy state valid: dirty bits are correct and you ma= y use + * cancel + to emulate pause/resume. + */ +void block_copy_cancel(BlockCopyCallState *call_state); + BdrvDirtyBitmap *block_copy_dirty_bitmap(BlockCopyState *s); void block_copy_set_skip_unallocated(BlockCopyState *s, bool skip); =20 diff --git a/block/block-copy.c b/block/block-copy.c index 851d9c8aaf..b551feb6c2 100644 --- a/block/block-copy.c +++ b/block/block-copy.c @@ -44,6 +44,8 @@ typedef struct BlockCopyCallState { bool failed; bool finished; QemuCoSleepState *sleep_state; + bool cancelled; + Coroutine *canceller; =20 /* OUT parameters */ bool error_is_read; @@ -582,7 +584,7 @@ block_copy_dirty_clusters(BlockCopyCallState *call_stat= e) assert(QEMU_IS_ALIGNED(offset, s->cluster_size)); assert(QEMU_IS_ALIGNED(bytes, s->cluster_size)); =20 - while (bytes && aio_task_pool_status(aio) =3D=3D 0) { + while (bytes && aio_task_pool_status(aio) =3D=3D 0 && !call_state->can= celled) { BlockCopyTask *task; int64_t status_bytes; =20 @@ -693,7 +695,7 @@ static int coroutine_fn block_copy_common(BlockCopyCall= State *call_state) do { ret =3D block_copy_dirty_clusters(call_state); =20 - if (ret =3D=3D 0) { + if (ret =3D=3D 0 && !call_state->cancelled) { ret =3D block_copy_wait_one(call_state->s, call_state->offset, call_state->bytes); } @@ -707,13 +709,18 @@ static int coroutine_fn block_copy_common(BlockCopyCa= llState *call_state) * 2. We have waited for some intersecting block-copy request * It may have failed and produced new dirty bits. */ - } while (ret > 0); + } while (ret > 0 && !call_state->cancelled); =20 if (call_state->cb) { call_state->cb(ret, call_state->error_is_read, call_state->s->progress_opaque); } =20 + if (call_state->canceller) { + aio_co_wake(call_state->canceller); + call_state->canceller =3D NULL; + } + call_state->finished =3D true; =20 return ret; @@ -772,6 +779,15 @@ BlockCopyCallState *block_copy_async(BlockCopyState *s, =20 return call_state; } + +void block_copy_cancel(BlockCopyCallState *call_state) +{ + call_state->cancelled =3D true; + call_state->canceller =3D qemu_coroutine_self(); + block_copy_kick(call_state); + qemu_coroutine_yield(); +} + BdrvDirtyBitmap *block_copy_dirty_bitmap(BlockCopyState *s) { return s->copy_bitmap; --=20 2.21.0