From patchwork Wed Feb 2 19:39:29 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vivek Goyal X-Patchwork-Id: 12733448 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 7C89FC433F5 for ; Wed, 2 Feb 2022 20:28:32 +0000 (UTC) Received: from localhost ([::1]:58850 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1nFMEx-0008Q4-J0 for qemu-devel@archiver.kernel.org; Wed, 02 Feb 2022 15:28:31 -0500 Received: from eggs.gnu.org ([209.51.188.92]:56332) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nFLU4-0004Sz-3V for qemu-devel@nongnu.org; Wed, 02 Feb 2022 14:40:04 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.129.124]:55220) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1nFLU1-00045U-1q for qemu-devel@nongnu.org; Wed, 02 Feb 2022 14:40:03 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1643830800; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=tKH3AEexlSocmySbh6E3vuPIaAbmGSdcwDPl9SSWXCU=; b=FDO3FoIArTGlx76/5/nMEwFXNesE4dubGvEVfHeR1VCg1fIc5+g3q6YIYqOmskBBzDuOCr 79IK0zBaRhCHZ2cw3YOYSF+14r1SJ/yLQmQl0ifjJp1Bkxncp6LS18JvszqIajsukCh9uF phM5WWs0h0JXKJzD+LnEv8NsntGqZT0= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-665-ed_OfJl3MOOsAF3d70Bm2A-1; Wed, 02 Feb 2022 14:39:59 -0500 X-MC-Unique: ed_OfJl3MOOsAF3d70Bm2A-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 5C6C78143EA for ; Wed, 2 Feb 2022 19:39:58 +0000 (UTC) Received: from horse.redhat.com (unknown [10.22.32.185]) by smtp.corp.redhat.com (Postfix) with ESMTP id 3DF2B4BC41; Wed, 2 Feb 2022 19:39:42 +0000 (UTC) Received: by horse.redhat.com (Postfix, from userid 10451) id C6F392245B6; Wed, 2 Feb 2022 14:39:41 -0500 (EST) From: Vivek Goyal To: qemu-devel@nongnu.org, virtio-fs@redhat.com Subject: [PATCH v5 3/9] virtiofsd: Parse extended "struct fuse_init_in" Date: Wed, 2 Feb 2022 14:39:29 -0500 Message-Id: <20220202193935.268777-4-vgoyal@redhat.com> In-Reply-To: <20220202193935.268777-1-vgoyal@redhat.com> References: <20220202193935.268777-1-vgoyal@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=vgoyal@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=170.10.129.124; envelope-from=vgoyal@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -28 X-Spam_score: -2.9 X-Spam_bar: -- X-Spam_report: (-2.9 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.086, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_LOW=-0.7, 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: , Cc: mszeredi@redhat.com, dgilbert@redhat.com, vgoyal@redhat.com Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Add some code to parse extended "struct fuse_init_in". And use a local variable "flag" to represent 64 bit flags. This will make it easier to add more features without having to worry about two 32bit flags (->flags and ->flags2) in "fuse_struct_in". Signed-off-by: Vivek Goyal --- tools/virtiofsd/fuse_lowlevel.c | 62 +++++++++++++++++++++------------ 1 file changed, 40 insertions(+), 22 deletions(-) diff --git a/tools/virtiofsd/fuse_lowlevel.c b/tools/virtiofsd/fuse_lowlevel.c index ce29a70253..1f10dcc75b 100644 --- a/tools/virtiofsd/fuse_lowlevel.c +++ b/tools/virtiofsd/fuse_lowlevel.c @@ -1881,11 +1881,15 @@ static void do_init(fuse_req_t req, fuse_ino_t nodeid, { size_t compat_size = offsetof(struct fuse_init_in, max_readahead); size_t compat2_size = offsetof(struct fuse_init_in, flags) + sizeof(uint32_t); + /* Fuse structure extended with minor version 36 */ + size_t compat3_size = offsetof(struct fuse_init_in, unused) + + (11 * sizeof(uint32_t)); struct fuse_init_in *arg; struct fuse_init_out outarg; struct fuse_session *se = req->se; size_t bufsize = se->bufsize; size_t outargsize = sizeof(outarg); + uint64_t flags = 0; (void)nodeid; @@ -1902,11 +1906,25 @@ static void do_init(fuse_req_t req, fuse_ino_t nodeid, fuse_reply_err(req, EINVAL); return; } + flags |= arg->flags; + } + + /* + * fuse_init_in was extended again with minor version 36. Just read + * current known size of fuse_init so that future extension and + * header rebase does not cause breakage. + */ + if (sizeof(*arg) > compat2_size && (arg->flags & FUSE_INIT_EXT)) { + if (!fuse_mbuf_iter_advance(iter, compat3_size - compat2_size)) { + fuse_reply_err(req, EINVAL); + return; + } + flags |= (uint64_t) arg->flags2 << 32; } fuse_log(FUSE_LOG_DEBUG, "INIT: %u.%u\n", arg->major, arg->minor); if (arg->major == 7 && arg->minor >= 6) { - fuse_log(FUSE_LOG_DEBUG, "flags=0x%08x\n", arg->flags); + fuse_log(FUSE_LOG_DEBUG, "flags=0x%016llx\n", flags); fuse_log(FUSE_LOG_DEBUG, "max_readahead=0x%08x\n", arg->max_readahead); } se->conn.proto_major = arg->major; @@ -1934,68 +1952,68 @@ static void do_init(fuse_req_t req, fuse_ino_t nodeid, if (arg->max_readahead < se->conn.max_readahead) { se->conn.max_readahead = arg->max_readahead; } - if (arg->flags & FUSE_ASYNC_READ) { + if (flags & FUSE_ASYNC_READ) { se->conn.capable |= FUSE_CAP_ASYNC_READ; } - if (arg->flags & FUSE_POSIX_LOCKS) { + if (flags & FUSE_POSIX_LOCKS) { se->conn.capable |= FUSE_CAP_POSIX_LOCKS; } - if (arg->flags & FUSE_ATOMIC_O_TRUNC) { + if (flags & FUSE_ATOMIC_O_TRUNC) { se->conn.capable |= FUSE_CAP_ATOMIC_O_TRUNC; } - if (arg->flags & FUSE_EXPORT_SUPPORT) { + if (flags & FUSE_EXPORT_SUPPORT) { se->conn.capable |= FUSE_CAP_EXPORT_SUPPORT; } - if (arg->flags & FUSE_DONT_MASK) { + if (flags & FUSE_DONT_MASK) { se->conn.capable |= FUSE_CAP_DONT_MASK; } - if (arg->flags & FUSE_FLOCK_LOCKS) { + if (flags & FUSE_FLOCK_LOCKS) { se->conn.capable |= FUSE_CAP_FLOCK_LOCKS; } - if (arg->flags & FUSE_AUTO_INVAL_DATA) { + if (flags & FUSE_AUTO_INVAL_DATA) { se->conn.capable |= FUSE_CAP_AUTO_INVAL_DATA; } - if (arg->flags & FUSE_DO_READDIRPLUS) { + if (flags & FUSE_DO_READDIRPLUS) { se->conn.capable |= FUSE_CAP_READDIRPLUS; } - if (arg->flags & FUSE_READDIRPLUS_AUTO) { + if (flags & FUSE_READDIRPLUS_AUTO) { se->conn.capable |= FUSE_CAP_READDIRPLUS_AUTO; } - if (arg->flags & FUSE_ASYNC_DIO) { + if (flags & FUSE_ASYNC_DIO) { se->conn.capable |= FUSE_CAP_ASYNC_DIO; } - if (arg->flags & FUSE_WRITEBACK_CACHE) { + if (flags & FUSE_WRITEBACK_CACHE) { se->conn.capable |= FUSE_CAP_WRITEBACK_CACHE; } - if (arg->flags & FUSE_NO_OPEN_SUPPORT) { + if (flags & FUSE_NO_OPEN_SUPPORT) { se->conn.capable |= FUSE_CAP_NO_OPEN_SUPPORT; } - if (arg->flags & FUSE_PARALLEL_DIROPS) { + if (flags & FUSE_PARALLEL_DIROPS) { se->conn.capable |= FUSE_CAP_PARALLEL_DIROPS; } - if (arg->flags & FUSE_POSIX_ACL) { + if (flags & FUSE_POSIX_ACL) { se->conn.capable |= FUSE_CAP_POSIX_ACL; } - if (arg->flags & FUSE_HANDLE_KILLPRIV) { + if (flags & FUSE_HANDLE_KILLPRIV) { se->conn.capable |= FUSE_CAP_HANDLE_KILLPRIV; } - if (arg->flags & FUSE_NO_OPENDIR_SUPPORT) { + if (flags & FUSE_NO_OPENDIR_SUPPORT) { se->conn.capable |= FUSE_CAP_NO_OPENDIR_SUPPORT; } - if (!(arg->flags & FUSE_MAX_PAGES)) { + if (!(flags & FUSE_MAX_PAGES)) { size_t max_bufsize = FUSE_DEFAULT_MAX_PAGES_PER_REQ * getpagesize() + FUSE_BUFFER_HEADER_SIZE; if (bufsize > max_bufsize) { bufsize = max_bufsize; } } - if (arg->flags & FUSE_SUBMOUNTS) { + if (flags & FUSE_SUBMOUNTS) { se->conn.capable |= FUSE_CAP_SUBMOUNTS; } - if (arg->flags & FUSE_HANDLE_KILLPRIV_V2) { + if (flags & FUSE_HANDLE_KILLPRIV_V2) { se->conn.capable |= FUSE_CAP_HANDLE_KILLPRIV_V2; } - if (arg->flags & FUSE_SETXATTR_EXT) { + if (flags & FUSE_SETXATTR_EXT) { se->conn.capable |= FUSE_CAP_SETXATTR_EXT; } #ifdef HAVE_SPLICE @@ -2063,7 +2081,7 @@ static void do_init(fuse_req_t req, fuse_ino_t nodeid, if (se->conn.max_write < bufsize - FUSE_BUFFER_HEADER_SIZE) { se->bufsize = se->conn.max_write + FUSE_BUFFER_HEADER_SIZE; } - if (arg->flags & FUSE_MAX_PAGES) { + if (flags & FUSE_MAX_PAGES) { outarg.flags |= FUSE_MAX_PAGES; outarg.max_pages = (se->conn.max_write - 1) / getpagesize() + 1; }