From: Andy Lutomirski Subject: Re: [PATCH v11 16/48] richacl: Automatic Inheritance Date: Fri, 16 Oct 2015 09:00:11 -0700 Message-ID: References: <1445008706-15115-1-git-send-email-agruenba@redhat.com> <1445008706-15115-17-git-send-email-agruenba@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: linux-cifs@vger.kernel.org, linux-nfs@vger.kernel.org, Theodore Ts'o , Linux API , Trond Myklebust , "linux-kernel@vger.kernel.org" , xfs@oss.sgi.com, "J. Bruce Fields" , Andreas Dilger , Alexander Viro , Linux FS Devel , Jeff Layton , "linux-ext4@vger.kernel.org" , Anna Schumaker To: Andreas Gruenbacher Return-path: In-Reply-To: <1445008706-15115-17-git-send-email-agruenba@redhat.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: xfs-bounces@oss.sgi.com Sender: xfs-bounces@oss.sgi.com List-Id: linux-ext4.vger.kernel.org On Fri, Oct 16, 2015 at 8:17 AM, Andreas Gruenbacher wrote: > Automatic Inheritance (AI) allows changes to the acl of a directory to > propagate down to children. > > This is mostly implemented in user space: when a process changes the > permissions of a directory and Automatic Inheritance is enabled for that > directory, the process must propagate those changes to all children, > recursively. > > The kernel enables this by keeping track of which permissions have been > inherited at create time. In addition, it makes sure that permission > propagation is turned off when the permissions are set explicitly (for > example, upon create or chmod). > > Automatic Inheritance works as follows: > > - When the RICHACL_AUTO_INHERIT flag in the acl of a file or directory > is not set, the file or directory is not affected by AI. > > - When the RICHACL_AUTO_INHERIT flag in the acl of a directory is set > and a file or subdirectory is created in that directory, the > inherited acl will have the RICHACL_AUTO_INHERIT flag set, and all > inherited aces will have the RICHACE_INHERITED_ACE flag set. This > allows user space to distinguish between aces which have been > inherited and aces which have been explicitly added. What if the file or subdirectory that's created in that directory is a hard link? --Andy _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs