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c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1773160010; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=BZk3YUP5SpVqzh6hMV3KaqxznPXV0KWA8O2wgLzS6ps=; b=AnChs8li1PlyF4EcUclKg+JVlPZ28x9D19aHWPpvyEQgo+8ZbnmtGAk/J+gE98cInhqTWz wzxMzF4fKLm14uPKXVIHpAWLRJWkKEVGB12fuiiA1rWBpzZ2pekt13Vwx6qeOLyr6gVFxm 5PFA62hdCb/ZBUI3+1DwWQ/6mtWjeMY= X-MC-Unique: 1hXKAtjPNAWB4_Z61yJ2Jw-1 X-Mimecast-MFC-AGG-ID: 1hXKAtjPNAWB4_Z61yJ2Jw_1773160006 From: Kevin Wolf To: qemu-block@nongnu.org Cc: kwolf@redhat.com, qemu-devel@nongnu.org Subject: [PULL 10/28] fuse: Introduce fuse_{inc,dec}_in_flight() Date: Tue, 10 Mar 2026 17:26:04 +0100 Message-ID: <20260310162622.333137-11-kwolf@redhat.com> In-Reply-To: <20260310162622.333137-1-kwolf@redhat.com> References: <20260310162622.333137-1-kwolf@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.0 on 10.30.177.12 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; 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charset="utf-8" From: Hanna Czenczek This is how vduse-blk.c does it, and it does seem better to have dedicated functions for it. Reviewed-by: Stefan Hajnoczi Signed-off-by: Hanna Czenczek Message-ID: <20260309150856.26800-11-hreitz@redhat.com> Reviewed-by: Kevin Wolf Signed-off-by: Kevin Wolf --- block/export/fuse.c | 29 +++++++++++++++++++++-------- 1 file changed, 21 insertions(+), 8 deletions(-) diff --git a/block/export/fuse.c b/block/export/fuse.c index 5953407f20f..fc75a5e74d9 100644 --- a/block/export/fuse.c +++ b/block/export/fuse.c @@ -78,6 +78,25 @@ static void read_from_fuse_export(void *opaque); static bool is_regular_file(const char *path, Error **errp); =20 =20 +static void fuse_inc_in_flight(FuseExport *exp) +{ + if (qatomic_fetch_inc(&exp->in_flight) =3D=3D 0) { + /* Prevent export from being deleted */ + blk_exp_ref(&exp->common); + } +} + +static void fuse_dec_in_flight(FuseExport *exp) +{ + if (qatomic_fetch_dec(&exp->in_flight) =3D=3D 1) { + /* Wake AIO_WAIT_WHILE() */ + aio_wait_kick(); + + /* Now the export can be deleted */ + blk_exp_unref(&exp->common); + } +} + static void fuse_attach_handlers(FuseExport *exp) { aio_set_fd_handler(exp->common.ctx, @@ -303,9 +322,7 @@ static void read_from_fuse_export(void *opaque) FuseExport *exp =3D opaque; int ret; =20 - blk_exp_ref(&exp->common); - - qatomic_inc(&exp->in_flight); + fuse_inc_in_flight(exp); =20 do { ret =3D fuse_session_receive_buf(exp->fuse_session, &exp->fuse_buf= ); @@ -323,11 +340,7 @@ static void read_from_fuse_export(void *opaque) fuse_session_process_buf(exp->fuse_session, &exp->fuse_buf); =20 out: - if (qatomic_fetch_dec(&exp->in_flight) =3D=3D 1) { - aio_wait_kick(); /* wake AIO_WAIT_WHILE() */ - } - - blk_exp_unref(&exp->common); + fuse_dec_in_flight(exp); } =20 static void fuse_export_shutdown(BlockExport *blk_exp) --=20 2.53.0