From patchwork Mon Feb 29 08:17:24 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andreas Gruenbacher X-Patchwork-Id: 8449731 Return-Path: X-Original-To: patchwork-linux-fsdevel@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork1.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.136]) by patchwork1.web.kernel.org (Postfix) with ESMTP id 37A849F38C for ; Mon, 29 Feb 2016 08:20:05 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 659F8201F4 for ; Mon, 29 Feb 2016 08:20:04 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id E8C9D202B8 for ; Mon, 29 Feb 2016 08:20:02 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753094AbcB2ISq (ORCPT ); Mon, 29 Feb 2016 03:18:46 -0500 Received: from mx1.redhat.com ([209.132.183.28]:45856 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753016AbcB2ISl (ORCPT ); Mon, 29 Feb 2016 03:18:41 -0500 Received: from int-mx09.intmail.prod.int.phx2.redhat.com (int-mx09.intmail.prod.int.phx2.redhat.com [10.5.11.22]) by mx1.redhat.com (Postfix) with ESMTPS id 44F95BBB3D; Mon, 29 Feb 2016 08:18:41 +0000 (UTC) Received: from schleppi.home.com (vpn1-4-25.ams2.redhat.com [10.36.4.25]) by int-mx09.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u1T8HS6O028000; Mon, 29 Feb 2016 03:18:38 -0500 From: Andreas Gruenbacher To: Alexander Viro Cc: "J. Bruce Fields" , linux-nfs@vger.kernel.org, "Theodore Ts'o" , linux-cifs@vger.kernel.org, linux-api@vger.kernel.org, Trond Myklebust , linux-kernel@vger.kernel.org, xfs@oss.sgi.com, Christoph Hellwig , Andreas Dilger , linux-fsdevel@vger.kernel.org, Jeff Layton , linux-ext4@vger.kernel.org, Anna Schumaker Subject: [PATCH v18 19/22] richacl: Add richacl xattr handler Date: Mon, 29 Feb 2016 09:17:24 +0100 Message-Id: <1456733847-17982-20-git-send-email-agruenba@redhat.com> In-Reply-To: <1456733847-17982-1-git-send-email-agruenba@redhat.com> References: <1456733847-17982-1-git-send-email-agruenba@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.22 Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org X-Spam-Status: No, score=-6.9 required=5.0 tests=BAYES_00, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Add richacl xattr handler implementing the xattr operations based on the get_richacl and set_richacl inode operations. Signed-off-by: Andreas Gruenbacher --- fs/richacl_xattr.c | 73 +++++++++++++++++++++++++++++++++++++++++++ include/linux/richacl_xattr.h | 2 ++ 2 files changed, 75 insertions(+) diff --git a/fs/richacl_xattr.c b/fs/richacl_xattr.c index a273139..afa2859 100644 --- a/fs/richacl_xattr.c +++ b/fs/richacl_xattr.c @@ -18,7 +18,9 @@ #include #include #include +#include #include +#include MODULE_LICENSE("GPL"); @@ -160,3 +162,74 @@ richacl_to_xattr(struct user_namespace *user_ns, return real_size; } EXPORT_SYMBOL_GPL(richacl_to_xattr); + +static bool +richacl_xattr_list(struct dentry *dentry) +{ + return IS_RICHACL(d_backing_inode(dentry)); +} + +static int +richacl_xattr_get(const struct xattr_handler *handler, + struct dentry *dentry, const char *name, void *buffer, + size_t buffer_size) +{ + struct inode *inode = d_backing_inode(dentry); + struct richacl *acl; + int error; + + if (*name) + return -EINVAL; + if (!IS_RICHACL(inode)) + return -EOPNOTSUPP; + if (S_ISLNK(inode->i_mode)) + return -EOPNOTSUPP; + acl = get_richacl(inode); + if (IS_ERR(acl)) + return PTR_ERR(acl); + if (acl == NULL) + return -ENODATA; + error = richacl_to_xattr(current_user_ns(), acl, buffer, buffer_size); + richacl_put(acl); + return error; +} + +static int +richacl_xattr_set(const struct xattr_handler *handler, + struct dentry *dentry, const char *name, + const void *value, size_t size, int flags) +{ + struct inode *inode = d_backing_inode(dentry); + struct richacl *acl = NULL; + int ret; + + if (*name) + return -EINVAL; + if (!IS_RICHACL(inode)) + return -EOPNOTSUPP; + if (!inode->i_op->set_richacl) + return -EOPNOTSUPP; + + if (!uid_eq(current_fsuid(), inode->i_uid) && + inode_permission(inode, MAY_CHMOD) && + !capable(CAP_FOWNER)) + return -EPERM; + + if (value) { + acl = richacl_from_xattr(current_user_ns(), value, size); + if (IS_ERR(acl)) + return PTR_ERR(acl); + } + + ret = inode->i_op->set_richacl(inode, acl); + richacl_put(acl); + return ret; +} + +struct xattr_handler richacl_xattr_handler = { + .name = XATTR_NAME_RICHACL, + .list = richacl_xattr_list, + .get = richacl_xattr_get, + .set = richacl_xattr_set, +}; +EXPORT_SYMBOL(richacl_xattr_handler); diff --git a/include/linux/richacl_xattr.h b/include/linux/richacl_xattr.h index ab67af2..ad4a56e 100644 --- a/include/linux/richacl_xattr.h +++ b/include/linux/richacl_xattr.h @@ -26,4 +26,6 @@ extern size_t richacl_xattr_size(const struct richacl *); extern int richacl_to_xattr(struct user_namespace *, const struct richacl *, void *, size_t); +extern struct xattr_handler richacl_xattr_handler; + #endif /* __RICHACL_XATTR_H */