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c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1738317086; 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=Gy0Ro0AiLBW+IDrNU0PGthGke20CO9S9gyVmcl9+x2Q=; b=Va9HZl7MY2nBvGZDlTeOYsk6qlQIZQoL4bi/ruqNzFp3gpzFVaH3hJCLELMRUgUp5SEuU2 BR73JEJ0OJRhm6BHR6WF3xxqEpf8x2suGIlhYcbW8dc5gczIAdtR8rosZq5LPytoWPNE1U yMqSBx2e0HnKR2CPfNhuPkr9gAoJjLE= X-MC-Unique: Y7UIwp2ePN6knLhQ6mzAZQ-1 X-Mimecast-MFC-AGG-ID: Y7UIwp2ePN6knLhQ6mzAZQ From: Kevin Wolf To: qemu-block@nongnu.org Cc: kwolf@redhat.com, hreitz@redhat.com, stefanha@redhat.com, pkrempa@redhat.com, peterx@redhat.com, farosas@suse.de, qemu-devel@nongnu.org Subject: [PATCH v2 12/15] nbd/server: Support inactive nodes Date: Fri, 31 Jan 2025 10:50:48 +0100 Message-ID: <20250131095051.49708-3-kwolf@redhat.com> In-Reply-To: <20250130171240.286878-1-kwolf@redhat.com> References: <20250130171240.286878-1-kwolf@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.111 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" In order to support running an NBD export on inactive nodes, we must make sure to return errors for any operations that aren't allowed on inactive nodes. Reads are the only operation we know we need for inactive images, so to err on the side of caution, return errors for everything else, even if some operations could possibly be okay. Signed-off-by: Kevin Wolf Reviewed-by: Eric Blake --- nbd/server.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) diff --git a/nbd/server.c b/nbd/server.c index f64e47270c..2076fb2666 100644 --- a/nbd/server.c +++ b/nbd/server.c @@ -2026,6 +2026,7 @@ static void nbd_export_delete(BlockExport *blk_exp) const BlockExportDriver blk_exp_nbd =3D { .type =3D BLOCK_EXPORT_TYPE_NBD, .instance_size =3D sizeof(NBDExport), + .supports_inactive =3D true, .create =3D nbd_export_create, .delete =3D nbd_export_delete, .request_shutdown =3D nbd_export_request_shutdown, @@ -2920,6 +2921,22 @@ static coroutine_fn int nbd_handle_request(NBDClient= *client, NBDExport *exp =3D client->exp; char *msg; size_t i; + bool inactive; + + WITH_GRAPH_RDLOCK_GUARD() { + inactive =3D bdrv_is_inactive(blk_bs(exp->common.blk)); + if (inactive) { + switch (request->type) { + case NBD_CMD_READ: + /* These commands are allowed on inactive nodes */ + break; + default: + /* Return an error for the rest */ + return nbd_send_generic_reply(client, request, -EPERM, + "export is inactive", errp); + } + } + } =20 switch (request->type) { case NBD_CMD_CACHE: --=20 2.48.1