From patchwork Wed Mar 16 22:18:54 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Andreas Gruenbacher X-Patchwork-Id: 8605411 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 9E0249F294 for ; Wed, 16 Mar 2016 22:23:38 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 9CBD72026F for ; Wed, 16 Mar 2016 22:23:37 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 8C6AA201E4 for ; Wed, 16 Mar 2016 22:23:36 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S967129AbcCPWUO (ORCPT ); Wed, 16 Mar 2016 18:20:14 -0400 Received: from mx1.redhat.com ([209.132.183.28]:52769 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S965805AbcCPWUK (ORCPT ); Wed, 16 Mar 2016 18:20:10 -0400 Received: from int-mx10.intmail.prod.int.phx2.redhat.com (int-mx10.intmail.prod.int.phx2.redhat.com [10.5.11.23]) by mx1.redhat.com (Postfix) with ESMTPS id 0E410C049E19; Wed, 16 Mar 2016 22:20:10 +0000 (UTC) Received: from nux.redhat.com (vpn1-5-8.ams2.redhat.com [10.36.5.8]) by int-mx10.intmail.prod.int.phx2.redhat.com (8.14.4/8.14.4) with ESMTP id u2GMJ4IB007786; Wed, 16 Mar 2016 18:20:06 -0400 From: Andreas Gruenbacher To: Alexander Viro Cc: Andreas Gruenbacher , Christoph Hellwig , "Theodore Ts'o" , Andreas Dilger , "J. Bruce Fields" , Jeff Layton , Trond Myklebust , Anna Schumaker , Dave Chinner , linux-ext4@vger.kernel.org, xfs@oss.sgi.com, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-nfs@vger.kernel.org, linux-cifs@vger.kernel.org, linux-api@vger.kernel.org Subject: [PATCH v20 14/23] vfs: Cache richacl in struct inode Date: Wed, 16 Mar 2016 23:18:54 +0100 Message-Id: <1458166743-18488-15-git-send-email-agruenba@redhat.com> In-Reply-To: <1458166743-18488-1-git-send-email-agruenba@redhat.com> References: <1458166743-18488-1-git-send-email-agruenba@redhat.com> X-Scanned-By: MIMEDefang 2.68 on 10.5.11.23 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 Cache richacls in struct inode so that this doesn't have to be done individually in each filesystem. This is similar to POSIX ACLs. Signed-off-by: Andreas Gruenbacher --- fs/inode.c | 11 +++++-- fs/posix_acl.c | 2 +- fs/richacl.c | 77 +++++++++++++++++++++++++++++++++++++++++++++++++ include/linux/fs.h | 5 +++- include/linux/richacl.h | 6 ++++ 5 files changed, 96 insertions(+), 5 deletions(-) diff --git a/fs/inode.c b/fs/inode.c index 101d806..de80116 100644 --- a/fs/inode.c +++ b/fs/inode.c @@ -180,8 +180,11 @@ int inode_init_always(struct super_block *sb, struct inode *inode) inode->i_private = NULL; inode->i_mapping = mapping; INIT_HLIST_HEAD(&inode->i_dentry); /* buggered by rcu freeing */ -#ifdef CONFIG_FS_POSIX_ACL - inode->i_acl = inode->i_default_acl = ACL_NOT_CACHED; +#if defined(CONFIG_FS_POSIX_ACL) || defined(CONFIG_FS_RICHACL) + inode->i_acl = ACL_NOT_CACHED; +# if defined(CONFIG_FS_POSIX_ACL) + inode->i_default_acl = ACL_NOT_CACHED; +# endif #endif #ifdef CONFIG_FSNOTIFY @@ -237,11 +240,13 @@ void __destroy_inode(struct inode *inode) atomic_long_dec(&inode->i_sb->s_remove_count); } -#ifdef CONFIG_FS_POSIX_ACL +#if defined(CONFIG_FS_POSIX_ACL) || defined(CONFIG_FS_RICHACL) if (inode->i_acl && inode->i_acl != ACL_NOT_CACHED) base_acl_put(inode->i_acl); +# if defined(CONFIG_FS_POSIX_ACL) if (inode->i_default_acl && inode->i_default_acl != ACL_NOT_CACHED) base_acl_put(inode->i_default_acl); +# endif #endif this_cpu_dec(nr_inodes); } diff --git a/fs/posix_acl.c b/fs/posix_acl.c index 743b6dc..f24646e 100644 --- a/fs/posix_acl.c +++ b/fs/posix_acl.c @@ -37,7 +37,7 @@ struct posix_acl *get_cached_acl(struct inode *inode, int type) { struct base_acl **p = acl_by_type(inode, type); struct base_acl *acl = ACCESS_ONCE(*p); - if (acl) { + if (acl && IS_POSIXACL(inode)) { spin_lock(&inode->i_lock); acl = *p; if (acl != ACL_NOT_CACHED) diff --git a/fs/richacl.c b/fs/richacl.c index 8971ead..59ef600 100644 --- a/fs/richacl.c +++ b/fs/richacl.c @@ -20,6 +20,83 @@ #include #include +struct richacl *get_cached_richacl(struct inode *inode) +{ + struct base_acl *acl; + + acl = ACCESS_ONCE(inode->i_acl); + if (acl && IS_RICHACL(inode)) { + spin_lock(&inode->i_lock); + acl = inode->i_acl; + if (acl != ACL_NOT_CACHED) + base_acl_get(acl); + spin_unlock(&inode->i_lock); + } + return container_of(acl, struct richacl, a_base); +} +EXPORT_SYMBOL_GPL(get_cached_richacl); + +struct richacl *get_cached_richacl_rcu(struct inode *inode) +{ + struct base_acl *acl = rcu_dereference(inode->i_acl); + + return container_of(acl, struct richacl, a_base); +} +EXPORT_SYMBOL_GPL(get_cached_richacl_rcu); + +void set_cached_richacl(struct inode *inode, struct richacl *acl) +{ + struct base_acl *old = NULL; + + spin_lock(&inode->i_lock); + old = inode->i_acl; + rcu_assign_pointer(inode->i_acl, &richacl_get(acl)->a_base); + spin_unlock(&inode->i_lock); + if (old != ACL_NOT_CACHED) + base_acl_put(old); +} +EXPORT_SYMBOL_GPL(set_cached_richacl); + +void forget_cached_richacl(struct inode *inode) +{ + struct base_acl *old = NULL; + + spin_lock(&inode->i_lock); + old = inode->i_acl; + inode->i_acl = ACL_NOT_CACHED; + spin_unlock(&inode->i_lock); + if (old != ACL_NOT_CACHED) + base_acl_put(old); +} +EXPORT_SYMBOL_GPL(forget_cached_richacl); + +struct richacl *get_richacl(struct inode *inode) +{ + struct richacl *acl; + + acl = get_cached_richacl(inode); + if (acl != ACL_NOT_CACHED) + return acl; + + if (!IS_RICHACL(inode)) + return NULL; + + /* + * A filesystem can force a ACL callback by just never filling the + * ACL cache. But normally you'd fill the cache either at inode + * instantiation time, or on the first ->get_richacl call. + * + * If the filesystem doesn't have a get_richacl() function at all, + * we'll just create the negative cache entry. + */ + if (!inode->i_op->get_richacl) { + set_cached_richacl(inode, NULL); + return NULL; + } + return inode->i_op->get_richacl(inode); +} +EXPORT_SYMBOL_GPL(get_richacl); + /** * richacl_alloc - allocate a richacl * @count: number of entries diff --git a/include/linux/fs.h b/include/linux/fs.h index e04dbb4..560f4e0 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -585,6 +585,7 @@ struct base_acl { }; }; struct posix_acl; +struct richacl; #define ACL_NOT_CACHED ((void *)(-1)) #define IOP_FASTPERM 0x0001 @@ -603,9 +604,11 @@ struct inode { kgid_t i_gid; unsigned int i_flags; -#if defined(CONFIG_FS_POSIX_ACL) +#if defined(CONFIG_FS_POSIX_ACL) || defined(CONFIG_FS_RICHACL) struct base_acl *i_acl; +# if defined(CONFIG_FS_POSIX_ACL) struct base_acl *i_default_acl; +# endif #endif const struct inode_operations *i_op; diff --git a/include/linux/richacl.h b/include/linux/richacl.h index 35a5bcb..d19b61b 100644 --- a/include/linux/richacl.h +++ b/include/linux/richacl.h @@ -70,6 +70,12 @@ richacl_put(struct richacl *acl) base_acl_put(&acl->a_base); } +extern struct richacl *get_cached_richacl(struct inode *); +extern struct richacl *get_cached_richacl_rcu(struct inode *); +extern void set_cached_richacl(struct inode *, struct richacl *); +extern void forget_cached_richacl(struct inode *); +extern struct richacl *get_richacl(struct inode *); + /** * richace_is_owner - check if @ace is an OWNER@ entry */