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GET /api/1.1/patches/2222003/?format=api
{ "id": 2222003, "url": "http://patchwork.ozlabs.org/api/1.1/patches/2222003/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260410150457.85190-5-zhangckid@gmail.com/", "project": { "id": 14, "url": "http://patchwork.ozlabs.org/api/1.1/projects/14/?format=api", "name": "QEMU Development", "link_name": "qemu-devel", "list_id": "qemu-devel.nongnu.org", "list_email": "qemu-devel@nongnu.org", "web_url": "", "scm_url": "", "webscm_url": "" }, "msgid": "<20260410150457.85190-5-zhangckid@gmail.com>", "date": "2026-04-10T15:04:47", "name": "[V6,04/14] blockdev: Update tracking iothread users with holder name", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "31efd602e1783a2168d30b8be7c3e8bee4002e05", "submitter": { "id": 72278, "url": "http://patchwork.ozlabs.org/api/1.1/people/72278/?format=api", "name": "Zhang Chen", "email": "zhangckid@gmail.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260410150457.85190-5-zhangckid@gmail.com/mbox/", "series": [ { "id": 499477, "url": "http://patchwork.ozlabs.org/api/1.1/series/499477/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=499477", "date": "2026-04-10T15:04:43", "name": "iothread: Support tracking and querying IOThread holders", "version": 6, "mbox": "http://patchwork.ozlabs.org/series/499477/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2222003/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2222003/checks/", "tags": {}, "headers": { "Return-Path": "<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256\n header.s=20251104 header.b=VD2kRAQi;\n\tdkim-atps=neutral", "legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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David Alan Gilbert\" <dave@treblig.org>,\n Eric Blake <eblake@redhat.com>, Markus Armbruster <armbru@redhat.com>,\n \"Michael S . Tsirkin\" <mst@redhat.com>,\n Stefan Hajnoczi <stefanha@redhat.com>", "Cc": "Zhang Chen <zhangckid@gmail.com>", "Subject": "[PATCH V6 04/14] blockdev: Update tracking iothread users with holder\n name", "Date": "Fri, 10 Apr 2026 23:04:47 +0800", "Message-ID": "<20260410150457.85190-5-zhangckid@gmail.com>", "X-Mailer": "git-send-email 2.49.0", "In-Reply-To": "<20260410150457.85190-1-zhangckid@gmail.com>", "References": "<20260410150457.85190-1-zhangckid@gmail.com>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "Received-SPF": "pass client-ip=2607:f8b0:4864:20::102f;\n envelope-from=zhangckid@gmail.com; helo=mail-pj1-x102f.google.com", "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, DKIM_SIGNED=0.1,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, FREEMAIL_FROM=0.001,\n RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001,\n SPF_PASS=-0.001 autolearn=ham autolearn_force=no", "X-Spam_action": "no action", "X-BeenThere": "qemu-devel@nongnu.org", "X-Mailman-Version": "2.1.29", "Precedence": "list", "List-Id": "qemu development <qemu-devel.nongnu.org>", "List-Unsubscribe": "<https://lists.nongnu.org/mailman/options/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>", "List-Archive": "<https://lists.nongnu.org/archive/html/qemu-devel>", "List-Post": "<mailto:qemu-devel@nongnu.org>", "List-Help": "<mailto:qemu-devel-request@nongnu.org?subject=help>", "List-Subscribe": "<https://lists.nongnu.org/mailman/listinfo/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=subscribe>", "Errors-To": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org", "Sender": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org" }, "content": "Currently, x-blockdev-set-iothread changes the AioContext but does not\ntrack the IOThread object itself within the block layer. This makes it\ndifficult to manage IOThread reference counting (put/get) during\ndynamic context switching.\n\nIntroduce an 'iothread' field to BlockDriverState to store the current\nassigned IOThread. Update qmp_x_blockdev_set_iothread to perform\nproper reference counting using iothread_ref/put when moving nodes\nbetween an IOThread and the main loop.\n\nThis ensures 'info iothreads' (holders) accurately reflects the block\ndevice attachment state after dynamic migrations.\n\nSigned-off-by: Zhang Chen <zhangckid@gmail.com>\n---\n blockdev.c | 6 +++++-\n include/block/block_int-common.h | 5 +++++\n 2 files changed, 10 insertions(+), 1 deletion(-)", "diff": "diff --git a/blockdev.c b/blockdev.c\nindex 6e86c6262f..6e20579187 100644\n--- a/blockdev.c\n+++ b/blockdev.c\n@@ -3683,8 +3683,12 @@ void qmp_x_blockdev_set_iothread(const char *node_name, StrOrNull *iothread,\n goto out;\n }\n \n- new_context = iothread_get_aio_context(obj);\n+ new_context = iothread_ref_and_get_aio_context(obj, node_name);\n+ bs->iothread = obj;\n } else {\n+ if (bs->iothread) {\n+ iothread_put_aio_context(bs->iothread, node_name);\n+ }\n new_context = qemu_get_aio_context();\n }\n \ndiff --git a/include/block/block_int-common.h b/include/block/block_int-common.h\nindex 147c08155f..6edaf53377 100644\n--- a/include/block/block_int-common.h\n+++ b/include/block/block_int-common.h\n@@ -1101,6 +1101,8 @@ typedef struct BdrvBlockStatusCache {\n int64_t data_end;\n } BdrvBlockStatusCache;\n \n+typedef struct IOThread IOThread;\n+\n struct BlockDriverState {\n /*\n * Protected by big QEMU lock or read-only after opening. No special\n@@ -1289,6 +1291,9 @@ struct BlockDriverState {\n \n /* array of write pointers' location of each zone in the zoned device. */\n BlockZoneWps *wps;\n+\n+ /* Track the iothread for detach aio context*/\n+ IOThread *iothread;\n };\n \n struct BlockBackendRootState {\n", "prefixes": [ "V6", "04/14" ] }