From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id EA40917756 for ; Wed, 9 Aug 2023 11:20:35 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 65786C433C8; Wed, 9 Aug 2023 11:20:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1691580035; bh=ZJchF7m3ZrlQJP4mwQBqgjadwArwlQ50Xl/dE38mYjA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=lr3Pzqyy9Dg4iFTn6gYhyF9dWRyDE/+omqFxwH/aHlOr4V8FjZqbdbXoO8RDEWFi7 AZ2rjgwR0iwzQid4ffih36C+EBnP/WgUH7JoS1DLXFzplRckzDTZ9QAt+O+n0Ep5b+ GE72m/fSTHTsjflgXcF8EWEC5n0UYAvPqIhKX5wE= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Xiubo Li , Milind Changire , Patrick Donnelly , Ilya Dryomov Subject: [PATCH 4.19 174/323] ceph: dont let check_caps skip sending responses for revoke msgs Date: Wed, 9 Aug 2023 12:40:12 +0200 Message-ID: <20230809103706.108145941@linuxfoundation.org> X-Mailer: git-send-email 2.41.0 In-Reply-To: <20230809103658.104386911@linuxfoundation.org> References: <20230809103658.104386911@linuxfoundation.org> User-Agent: quilt/0.67 Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit From: Xiubo Li commit 257e6172ab36ebbe295a6c9ee9a9dd0fe54c1dc2 upstream. If a client sends out a cap update dropping caps with the prior 'seq' just before an incoming cap revoke request, then the client may drop the revoke because it believes it's already released the requested capabilities. This causes the MDS to wait indefinitely for the client to respond to the revoke. It's therefore always a good idea to ack the cap revoke request with the bumped up 'seq'. Cc: stable@vger.kernel.org Link: https://tracker.ceph.com/issues/61782 Signed-off-by: Xiubo Li Reviewed-by: Milind Changire Reviewed-by: Patrick Donnelly Signed-off-by: Ilya Dryomov Signed-off-by: Greg Kroah-Hartman --- fs/ceph/caps.c | 9 +++++++++ 1 file changed, 9 insertions(+) --- a/fs/ceph/caps.c +++ b/fs/ceph/caps.c @@ -3285,6 +3285,15 @@ static void handle_cap_grant(struct inod } BUG_ON(cap->issued & ~cap->implemented); + /* don't let check_caps skip sending a response to MDS for revoke msgs */ + if (le32_to_cpu(grant->op) == CEPH_CAP_OP_REVOKE) { + cap->mds_wanted = 0; + if (cap == ci->i_auth_cap) + check_caps = 1; /* check auth cap only */ + else + check_caps = 2; /* check all caps */ + } + if (extra_info->inline_version > 0 && extra_info->inline_version >= ci->i_inline_version) { ci->i_inline_version = extra_info->inline_version;