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Fri, 9 Oct 2020 08:34:33 +0200 (CEST) From: Markus Armbruster To: qemu-devel@nongnu.org Subject: [PULL 14/14] block: Convert 'block_resize' to coroutine Date: Fri, 9 Oct 2020 08:34:32 +0200 Message-Id: <20201009063432.303441-15-armbru@redhat.com> In-Reply-To: <20201009063432.303441-1-armbru@redhat.com> References: <20201009063432.303441-1-armbru@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.84 on 10.5.11.22 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=armbru@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Transfer-Encoding: 8bit Content-Type: text/plain; charset="US-ASCII" Received-SPF: pass client-ip=216.205.24.124; envelope-from=armbru@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/10/09 02:34:37 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no 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, Stefan Hajnoczi Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" From: Kevin Wolf block_resize performs some I/O that could potentially take quite some time, so use it as an example for the new 'coroutine': true annotation in the QAPI schema. bdrv_truncate() requires that we're already in the right AioContext for the BlockDriverState if called in coroutine context. So instead of just taking the AioContext lock, move the QMP handler coroutine to the context. Call blk_unref() only after switching back because blk_unref() may only be called in the main thread. Signed-off-by: Kevin Wolf Message-Id: <20201005155855.256490-15-kwolf@redhat.com> Reviewed-by: Stefan Hajnoczi Signed-off-by: Markus Armbruster --- qapi/block-core.json | 3 ++- blockdev.c | 16 ++++++++-------- hmp-commands.hx | 1 + 3 files changed, 11 insertions(+), 9 deletions(-) diff --git a/qapi/block-core.json b/qapi/block-core.json index 3758ea9912..ee5ebef7f2 100644 --- a/qapi/block-core.json +++ b/qapi/block-core.json @@ -1310,7 +1310,8 @@ { 'command': 'block_resize', 'data': { '*device': 'str', '*node-name': 'str', - 'size': 'int' } } + 'size': 'int' }, + 'coroutine': true } ## # @NewImageMode: diff --git a/blockdev.c b/blockdev.c index a6ae475dac..fe6fb5dc1d 100644 --- a/blockdev.c +++ b/blockdev.c @@ -2449,14 +2449,14 @@ BlockDirtyBitmapSha256 *qmp_x_debug_block_dirty_bitmap_sha256(const char *node, return ret; } -void qmp_block_resize(bool has_device, const char *device, - bool has_node_name, const char *node_name, - int64_t size, Error **errp) +void coroutine_fn qmp_block_resize(bool has_device, const char *device, + bool has_node_name, const char *node_name, + int64_t size, Error **errp) { Error *local_err = NULL; BlockBackend *blk = NULL; BlockDriverState *bs; - AioContext *aio_context; + AioContext *old_ctx; bs = bdrv_lookup_bs(has_device ? device : NULL, has_node_name ? node_name : NULL, @@ -2466,9 +2466,6 @@ void qmp_block_resize(bool has_device, const char *device, return; } - aio_context = bdrv_get_aio_context(bs); - aio_context_acquire(aio_context); - if (size < 0) { error_setg(errp, QERR_INVALID_PARAMETER_VALUE, "size", "a >0 size"); goto out; @@ -2485,12 +2482,15 @@ void qmp_block_resize(bool has_device, const char *device, } bdrv_drained_begin(bs); + old_ctx = bdrv_co_enter(bs); blk_truncate(blk, size, false, PREALLOC_MODE_OFF, 0, errp); + bdrv_co_leave(bs, old_ctx); bdrv_drained_end(bs); out: + bdrv_co_lock(bs); blk_unref(blk); - aio_context_release(aio_context); + bdrv_co_unlock(bs); } void qmp_block_stream(bool has_job_id, const char *job_id, const char *device, diff --git a/hmp-commands.hx b/hmp-commands.hx index e43ce600b8..cd068389de 100644 --- a/hmp-commands.hx +++ b/hmp-commands.hx @@ -76,6 +76,7 @@ ERST .params = "device size", .help = "resize a block image", .cmd = hmp_block_resize, + .coroutine = true, }, SRST -- 2.26.2