From patchwork Tue Jun 13 05:23:34 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Xiubo Li X-Patchwork-Id: 13277973 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 5E743C7EE43 for ; Tue, 13 Jun 2023 05:30:00 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S240037AbjFMF37 (ORCPT ); Tue, 13 Jun 2023 01:29:59 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:39540 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S240046AbjFMF3Y (ORCPT ); Tue, 13 Jun 2023 01:29:24 -0400 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 36B1A1701 for ; Mon, 12 Jun 2023 22:28:16 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1686634095; 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=Ce8N6vkiXmNydGw5f0IcsBN17e64sV4vTmNYDiOseNM=; b=VcUXdM7CMPS6b8+N/Heuei5hV68oXG+nfdotE1tjbmknH/D11tV4OMkL77uY0Yi52tgC4W Bi4I3bY8g9GwGOcgWX2K1X9dmFJ28f7BjUFUpWou0yT+AdBjLFJh2dmfwtfZvw3hRfT2EU IGUFn047MzQV2f56daw7aUH52m/rT/k= Received: from mimecast-mx02.redhat.com (mx3-rdu2.redhat.com [66.187.233.73]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-602-pwDb12gcNQ2zBAQZ6b0lhA-1; Tue, 13 Jun 2023 01:28:12 -0400 X-MC-Unique: pwDb12gcNQ2zBAQZ6b0lhA-1 Received: from smtp.corp.redhat.com (int-mx03.intmail.prod.int.rdu2.redhat.com [10.11.54.3]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx02.redhat.com (Postfix) with ESMTPS id B38813C0D1A4; Tue, 13 Jun 2023 05:28:11 +0000 (UTC) Received: from li-a71a4dcc-35d1-11b2-a85c-951838863c8d.ibm.com.com (ovpn-12-155.pek2.redhat.com [10.72.12.155]) by smtp.corp.redhat.com (Postfix) with ESMTP id 2ADEA1121314; Tue, 13 Jun 2023 05:28:07 +0000 (UTC) From: xiubli@redhat.com To: idryomov@gmail.com, ceph-devel@vger.kernel.org Cc: jlayton@kernel.org, vshankar@redhat.com, mchangir@redhat.com, lhenriques@suse.de, Xiubo Li Subject: [PATCH v20 21/71] ceph: send altname in MClientRequest Date: Tue, 13 Jun 2023 13:23:34 +0800 Message-Id: <20230613052424.254540-22-xiubli@redhat.com> In-Reply-To: <20230613052424.254540-1-xiubli@redhat.com> References: <20230613052424.254540-1-xiubli@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.1 on 10.11.54.3 Precedence: bulk List-ID: X-Mailing-List: ceph-devel@vger.kernel.org From: Jeff Layton In the event that we have a filename longer than CEPH_NOHASH_NAME_MAX, we'll need to hash the tail of the filename. The client however will still need to know the full name of the file if it has a key. To support this, the MClientRequest field has grown a new alternate_name field that we populate with the full (binary) crypttext of the filename. This is then transmitted to the clients in readdir or traces as part of the dentry lease. Add support for populating this field when the filenames are very long. Tested-by: Luís Henriques Tested-by: Venky Shankar Reviewed-by: Luís Henriques Reviewed-by: Xiubo Li Signed-off-by: Jeff Layton --- fs/ceph/mds_client.c | 75 +++++++++++++++++++++++++++++++++++++++++--- fs/ceph/mds_client.h | 3 ++ 2 files changed, 73 insertions(+), 5 deletions(-) diff --git a/fs/ceph/mds_client.c b/fs/ceph/mds_client.c index 294ef090bac7..931827892fed 100644 --- a/fs/ceph/mds_client.c +++ b/fs/ceph/mds_client.c @@ -1048,6 +1048,7 @@ void ceph_mdsc_release_request(struct kref *kref) if (req->r_pagelist) ceph_pagelist_release(req->r_pagelist); kfree(req->r_fscrypt_auth); + kfree(req->r_altname); put_request_session(req); ceph_unreserve_caps(req->r_mdsc, &req->r_caps_reservation); WARN_ON_ONCE(!list_empty(&req->r_wait)); @@ -2485,6 +2486,63 @@ static inline u64 __get_oldest_tid(struct ceph_mds_client *mdsc) return mdsc->oldest_tid; } +#if IS_ENABLED(CONFIG_FS_ENCRYPTION) +static u8 *get_fscrypt_altname(const struct ceph_mds_request *req, u32 *plen) +{ + struct inode *dir = req->r_parent; + struct dentry *dentry = req->r_dentry; + u8 *cryptbuf = NULL; + u32 len = 0; + int ret = 0; + + /* only encode if we have parent and dentry */ + if (!dir || !dentry) + goto success; + + /* No-op unless this is encrypted */ + if (!IS_ENCRYPTED(dir)) + goto success; + + ret = __fscrypt_prepare_readdir(dir); + if (ret) + return ERR_PTR(ret); + + /* No key? Just ignore it. */ + if (!fscrypt_has_encryption_key(dir)) + goto success; + + if (!fscrypt_fname_encrypted_size(dir, dentry->d_name.len, NAME_MAX, &len)) { + WARN_ON_ONCE(1); + return ERR_PTR(-ENAMETOOLONG); + } + + /* No need to append altname if name is short enough */ + if (len <= CEPH_NOHASH_NAME_MAX) { + len = 0; + goto success; + } + + cryptbuf = kmalloc(len, GFP_KERNEL); + if (!cryptbuf) + return ERR_PTR(-ENOMEM); + + ret = fscrypt_fname_encrypt(dir, &dentry->d_name, cryptbuf, len); + if (ret) { + kfree(cryptbuf); + return ERR_PTR(ret); + } +success: + *plen = len; + return cryptbuf; +} +#else +static u8 *get_fscrypt_altname(const struct ceph_mds_request *req, u32 *plen) +{ + *plen = 0; + return NULL; +} +#endif + /** * ceph_mdsc_build_path - build a path string to a given dentry * @dentry: dentry to which path should be built @@ -2705,14 +2763,15 @@ static void encode_mclientrequest_tail(void **p, const struct ceph_mds_request * ceph_encode_timespec64(&ts, &req->r_stamp); ceph_encode_copy(p, &ts, sizeof(ts)); - /* gid_list */ + /* v4: gid_list */ ceph_encode_32(p, req->r_cred->group_info->ngroups); for (i = 0; i < req->r_cred->group_info->ngroups; i++) ceph_encode_64(p, from_kgid(&init_user_ns, req->r_cred->group_info->gid[i])); - /* v5: altname (TODO: skip for now) */ - ceph_encode_32(p, 0); + /* v5: altname */ + ceph_encode_32(p, req->r_altname_len); + ceph_encode_copy(p, req->r_altname, req->r_altname_len); /* v6: fscrypt_auth and fscrypt_file */ if (req->r_fscrypt_auth) { @@ -2772,7 +2831,13 @@ static struct ceph_msg *create_request_message(struct ceph_mds_session *session, goto out_free1; } - /* head */ + req->r_altname = get_fscrypt_altname(req, &req->r_altname_len); + if (IS_ERR(req->r_altname)) { + msg = ERR_CAST(req->r_altname); + req->r_altname = NULL; + goto out_free2; + } + len = legacy ? sizeof(*head) : sizeof(struct ceph_mds_request_head); /* filepaths */ @@ -2798,7 +2863,7 @@ static struct ceph_msg *create_request_message(struct ceph_mds_session *session, len += sizeof(u32) + (sizeof(u64) * req->r_cred->group_info->ngroups); /* alternate name */ - len += sizeof(u32); // TODO + len += sizeof(u32) + req->r_altname_len; /* fscrypt_auth */ len += sizeof(u32); // fscrypt_auth diff --git a/fs/ceph/mds_client.h b/fs/ceph/mds_client.h index 5b338e591c46..7a3d1b01aa36 100644 --- a/fs/ceph/mds_client.h +++ b/fs/ceph/mds_client.h @@ -290,6 +290,9 @@ struct ceph_mds_request { struct ceph_fscrypt_auth *r_fscrypt_auth; + u8 *r_altname; /* fscrypt binary crypttext for long filenames */ + u32 r_altname_len; /* length of r_altname */ + int r_fmode; /* file mode, if expecting cap */ int r_request_release_offset; const struct cred *r_cred;