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bh=jw+sVL0vSNf45fXhXNhnpmyDKEDshiUy1iXF36YCo+A=; b=VGYwEjXDYBNCFEjZr6pBNW0Hi33FZ/aXDx8Ddj2V8CBm4EC7bGXArHQnGy2wv+QrZ+rkEK oFrdWwZtiwtWuqESqvnDLVogaE0w4SFgCIjxPGfzKjCyJvQDJU5290fb3Alq85FC1VNZzw JL0MmPgaPvINuoDqmPF7W4b8jqO5Vso= X-MC-Unique: Galc_Ek1MU-vfeO7GzyLQQ-1 From: Kevin Wolf To: qemu-block@nongnu.org Cc: kwolf@redhat.com, stefanha@redhat.com, hreitz@redhat.com, eblake@redhat.com, qemu-devel@nongnu.org Subject: [PATCH v2 09/11] blockjob: Fix AioContext locking in block_job_add_bdrv() Date: Mon, 5 Jun 2023 10:57:09 +0200 Message-Id: <20230605085711.21261-10-kwolf@redhat.com> In-Reply-To: <20230605085711.21261-1-kwolf@redhat.com> References: <20230605085711.21261-1-kwolf@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.1 on 10.11.54.2 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=kwolf@redhat.com; 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=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 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: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1685955493386100003 Content-Type: text/plain; charset="utf-8" bdrv_root_attach_child() requires callers to hold the AioContext lock for child_bs. Take it in block_job_add_bdrv() before calling the function. Signed-off-by: Kevin Wolf --- blockjob.c | 17 ++++++++++++----- 1 file changed, 12 insertions(+), 5 deletions(-) diff --git a/blockjob.c b/blockjob.c index 913da3cbf7..25fe8e625d 100644 --- a/blockjob.c +++ b/blockjob.c @@ -230,20 +230,27 @@ int block_job_add_bdrv(BlockJob *job, const char *nam= e, BlockDriverState *bs, uint64_t perm, uint64_t shared_perm, Error **errp) { BdrvChild *c; + AioContext *ctx =3D bdrv_get_aio_context(bs); bool need_context_ops; GLOBAL_STATE_CODE(); =20 bdrv_ref(bs); =20 - need_context_ops =3D bdrv_get_aio_context(bs) !=3D job->job.aio_contex= t; + need_context_ops =3D ctx !=3D job->job.aio_context; =20 - if (need_context_ops && job->job.aio_context !=3D qemu_get_aio_context= ()) { - aio_context_release(job->job.aio_context); + if (need_context_ops) { + if (job->job.aio_context !=3D qemu_get_aio_context()) { + aio_context_release(job->job.aio_context); + } + aio_context_acquire(ctx); } c =3D bdrv_root_attach_child(bs, name, &child_job, 0, perm, shared_per= m, job, errp); - if (need_context_ops && job->job.aio_context !=3D qemu_get_aio_context= ()) { - aio_context_acquire(job->job.aio_context); + if (need_context_ops) { + aio_context_release(ctx); + if (job->job.aio_context !=3D qemu_get_aio_context()) { + aio_context_acquire(job->job.aio_context); + } } if (c =3D=3D NULL) { return -EPERM; --=20 2.40.1