From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_NONE,USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 8F57FC43460 for ; Tue, 13 Apr 2021 17:51:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7849461244 for ; Tue, 13 Apr 2021 17:51:17 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1347458AbhDMRvf (ORCPT ); Tue, 13 Apr 2021 13:51:35 -0400 Received: from mail.kernel.org ([198.145.29.99]:44794 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1347400AbhDMRvV (ORCPT ); Tue, 13 Apr 2021 13:51:21 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id C9FF861249; Tue, 13 Apr 2021 17:51:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1618336261; bh=MXgkVCLtxXyRgA+yw+ns+X4rLSubJF4ulXZpajaCR6k=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=OYsxVjMX6GFArT4Ow33NiFnuU8HWsjqcm2HLXcZMmr3o+q6OIBMxWM7JfMwMXosUN 6JkPBEGYeG/dH9XZuEBWn5lbxWtZ05Ot5ri/tZ7ht8k04Xn7rtvoXp/xI+Qy2xouQZ GjmVSnl6loTknlyd/Nn4ByGRL1xv4J5m9zvWhsDcWEnFUG9zotzhLyT6Ccx3Be4sud R88+vfvyYXPOQL6pTzBOmRTPeniuUdcL+6SVSqFKsCkNCuBMfKhn4eM7ZGs+rJp1A8 p+Jg/dycDKwvmGlVPGZ48PbwLoiy4ji8KetO5zc0KwbBRzmLfmswN+nIdqNrELm1gh VCpn+D/KA4q7g== From: Jeff Layton To: ceph-devel@vger.kernel.org Cc: linux-fsdevel@vger.kernel.org, linux-fscrypt@vger.kernel.org, lhenriques@suse.de Subject: [RFC PATCH v6 11/20] ceph: decode alternate_name in lease info Date: Tue, 13 Apr 2021 13:50:43 -0400 Message-Id: <20210413175052.163865-12-jlayton@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210413175052.163865-1-jlayton@kernel.org> References: <20210413175052.163865-1-jlayton@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: ceph-devel@vger.kernel.org Ceph is a bit different from local filesystems, in that we don't want to store filenames as raw binary data, since we may also be dealing with clients that don't support fscrypt. We could just base64-encode the encrypted filenames, but that could leave us with filenames longer than NAME_MAX. It turns out that the MDS doesn't care much about filename length, but the clients do. To manage this, we've added a new "alternate name" field that can be optionally added to any dentry that we'll use to store the binary crypttext of the filename if its base64-encoded value will be longer than NAME_MAX. When a dentry has one of these names attached, the MDS will send it along in the lease info, which we can then store for later usage. Signed-off-by: Jeff Layton --- fs/ceph/mds_client.c | 40 ++++++++++++++++++++++++++++++---------- fs/ceph/mds_client.h | 11 +++++++---- 2 files changed, 37 insertions(+), 14 deletions(-) diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c index 85e8f578d555..77181a1fc900 100644 --- a/fs/ceph/mds_client.c +++ b/fs/ceph/mds_client.c @@ -283,27 +283,44 @@ static int parse_reply_info_dir(void **p, void *end, static int parse_reply_info_lease(void **p, void *end, struct ceph_mds_reply_lease **lease, - u64 features) + u64 features, u32 *altname_len, u8 **altname) { + u8 struct_v; + u32 struct_len; + if (features == (u64)-1) { - u8 struct_v, struct_compat; - u32 struct_len; + u8 struct_compat; + ceph_decode_8_safe(p, end, struct_v, bad); ceph_decode_8_safe(p, end, struct_compat, bad); + /* struct_v is expected to be >= 1. we only understand * encoding whose struct_compat == 1. */ if (!struct_v || struct_compat != 1) goto bad; + ceph_decode_32_safe(p, end, struct_len, bad); - ceph_decode_need(p, end, struct_len, bad); - end = *p + struct_len; + } else { + struct_len = sizeof(**lease); + *altname_len = 0; + *altname = NULL; } - ceph_decode_need(p, end, sizeof(**lease), bad); + ceph_decode_need(p, end, struct_len, bad); *lease = *p; *p += sizeof(**lease); - if (features == (u64)-1) - *p = end; + + if (features == (u64)-1) { + if (struct_v >= 2) { + ceph_decode_32_safe(p, end, *altname_len, bad); + ceph_decode_need(p, end, *altname_len, bad); + *altname = *p; + *p += *altname_len; + } else { + *altname = NULL; + *altname_len = 0; + } + } return 0; bad: return -EIO; @@ -333,7 +350,8 @@ static int parse_reply_info_trace(void **p, void *end, info->dname = *p; *p += info->dname_len; - err = parse_reply_info_lease(p, end, &info->dlease, features); + err = parse_reply_info_lease(p, end, &info->dlease, features, + &info->altname_len, &info->altname); if (err < 0) goto out_bad; } @@ -400,9 +418,11 @@ static int parse_reply_info_readdir(void **p, void *end, dout("parsed dir dname '%.*s'\n", rde->name_len, rde->name); /* dentry lease */ - err = parse_reply_info_lease(p, end, &rde->lease, features); + err = parse_reply_info_lease(p, end, &rde->lease, features, + &rde->altname_len, &rde->altname); if (err) goto out_bad; + /* inode */ err = parse_reply_info_in(p, end, &rde->inode, features); if (err < 0) diff --git a/fs/ceph/mds_client.h b/fs/ceph/mds_client.h index 84c4476bc520..676fd994f6b8 100644 --- a/fs/ceph/mds_client.h +++ b/fs/ceph/mds_client.h @@ -29,8 +29,8 @@ enum ceph_feature_type { CEPHFS_FEATURE_MULTI_RECONNECT, CEPHFS_FEATURE_DELEG_INO, CEPHFS_FEATURE_METRIC_COLLECT, - - CEPHFS_FEATURE_MAX = CEPHFS_FEATURE_METRIC_COLLECT, + CEPHFS_FEATURE_ALTERNATE_NAME, + CEPHFS_FEATURE_MAX = CEPHFS_FEATURE_ALTERNATE_NAME, }; /* @@ -45,8 +45,7 @@ enum ceph_feature_type { CEPHFS_FEATURE_MULTI_RECONNECT, \ CEPHFS_FEATURE_DELEG_INO, \ CEPHFS_FEATURE_METRIC_COLLECT, \ - \ - CEPHFS_FEATURE_MAX, \ + CEPHFS_FEATURE_ALTERNATE_NAME, \ } #define CEPHFS_FEATURES_CLIENT_REQUIRED {} @@ -95,7 +94,9 @@ struct ceph_mds_reply_info_in { struct ceph_mds_reply_dir_entry { char *name; + u8 *altname; u32 name_len; + u32 altname_len; struct ceph_mds_reply_lease *lease; struct ceph_mds_reply_info_in inode; loff_t offset; @@ -114,7 +115,9 @@ struct ceph_mds_reply_info_parsed { struct ceph_mds_reply_info_in diri, targeti; struct ceph_mds_reply_dirfrag *dirfrag; char *dname; + u8 *altname; u32 dname_len; + u32 altname_len; struct ceph_mds_reply_lease *dlease; /* extra */ -- 2.30.2