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GET /api/patches/2197744/?format=api
{ "id": 2197744, "url": "http://patchwork.ozlabs.org/api/patches/2197744/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260218132633.29748-11-hreitz@redhat.com/", "project": { "id": 14, "url": "http://patchwork.ozlabs.org/api/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": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260218132633.29748-11-hreitz@redhat.com>", "list_archive_url": null, "date": "2026-02-18T13:26:19", "name": "[v4,10/24] fuse: Introduce fuse_{inc,dec}_in_flight()", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "0a389b383643f318e82f0acb2680869d3d25c815", "submitter": { "id": 82279, "url": "http://patchwork.ozlabs.org/api/people/82279/?format=api", "name": "Hanna Czenczek", "email": "hreitz@redhat.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260218132633.29748-11-hreitz@redhat.com/mbox/", "series": [ { "id": 492547, "url": "http://patchwork.ozlabs.org/api/series/492547/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=492547", "date": "2026-02-18T13:26:09", "name": "export/fuse: Use coroutines and multi-threading", "version": 4, "mbox": "http://patchwork.ozlabs.org/series/492547/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2197744/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2197744/checks/", "tags": {}, "related": [], "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 (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=KlftOX/M;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=google header.b=Jlvj8D/H;\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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charset=UTF-8", "Content-Transfer-Encoding": "8bit", "Received-SPF": "pass client-ip=170.10.133.124; envelope-from=hreitz@redhat.com;\n helo=us-smtp-delivery-124.mimecast.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, DKIMWL_WL_HIGH=-0.043,\n DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H5=0.001, RCVD_IN_MSPIKE_WL=0.001,\n RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001,\n SPF_HELO_PASS=-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": "2.1.29", "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": "This is how vduse-blk.c does it, and it does seem better to have\ndedicated functions for it.\n\nReviewed-by: Stefan Hajnoczi <stefanha@redhat.com>\nSigned-off-by: Hanna Czenczek <hreitz@redhat.com>\n---\n block/export/fuse.c | 29 +++++++++++++++++++++--------\n 1 file changed, 21 insertions(+), 8 deletions(-)", "diff": "diff --git a/block/export/fuse.c b/block/export/fuse.c\nindex 5953407f20..fc75a5e74d 100644\n--- a/block/export/fuse.c\n+++ b/block/export/fuse.c\n@@ -78,6 +78,25 @@ static void read_from_fuse_export(void *opaque);\n static bool is_regular_file(const char *path, Error **errp);\n \n \n+static void fuse_inc_in_flight(FuseExport *exp)\n+{\n+ if (qatomic_fetch_inc(&exp->in_flight) == 0) {\n+ /* Prevent export from being deleted */\n+ blk_exp_ref(&exp->common);\n+ }\n+}\n+\n+static void fuse_dec_in_flight(FuseExport *exp)\n+{\n+ if (qatomic_fetch_dec(&exp->in_flight) == 1) {\n+ /* Wake AIO_WAIT_WHILE() */\n+ aio_wait_kick();\n+\n+ /* Now the export can be deleted */\n+ blk_exp_unref(&exp->common);\n+ }\n+}\n+\n static void fuse_attach_handlers(FuseExport *exp)\n {\n aio_set_fd_handler(exp->common.ctx,\n@@ -303,9 +322,7 @@ static void read_from_fuse_export(void *opaque)\n FuseExport *exp = opaque;\n int ret;\n \n- blk_exp_ref(&exp->common);\n-\n- qatomic_inc(&exp->in_flight);\n+ fuse_inc_in_flight(exp);\n \n do {\n ret = fuse_session_receive_buf(exp->fuse_session, &exp->fuse_buf);\n@@ -323,11 +340,7 @@ static void read_from_fuse_export(void *opaque)\n fuse_session_process_buf(exp->fuse_session, &exp->fuse_buf);\n \n out:\n- if (qatomic_fetch_dec(&exp->in_flight) == 1) {\n- aio_wait_kick(); /* wake AIO_WAIT_WHILE() */\n- }\n-\n- blk_exp_unref(&exp->common);\n+ fuse_dec_in_flight(exp);\n }\n \n static void fuse_export_shutdown(BlockExport *blk_exp)\n", "prefixes": [ "v4", "10/24" ] }