Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1758070Ab0DOXJt (ORCPT ); Thu, 15 Apr 2010 19:09:49 -0400 Received: from mx1.redhat.com ([209.132.183.28]:29269 "EHLO mx1.redhat.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757984Ab0DOXHd (ORCPT ); Thu, 15 Apr 2010 19:07:33 -0400 From: Valerie Aurora To: Alexander Viro Cc: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, Valerie Aurora Subject: [PATCH 31/35] union-mount: Implement union-aware chown() Date: Thu, 15 Apr 2010 16:04:38 -0700 Message-Id: <1271372682-21225-32-git-send-email-vaurora@redhat.com> In-Reply-To: <1271372682-21225-31-git-send-email-vaurora@redhat.com> References: <1271372682-21225-1-git-send-email-vaurora@redhat.com> <1271372682-21225-2-git-send-email-vaurora@redhat.com> <1271372682-21225-3-git-send-email-vaurora@redhat.com> <1271372682-21225-4-git-send-email-vaurora@redhat.com> <1271372682-21225-5-git-send-email-vaurora@redhat.com> <1271372682-21225-6-git-send-email-vaurora@redhat.com> <1271372682-21225-7-git-send-email-vaurora@redhat.com> <1271372682-21225-8-git-send-email-vaurora@redhat.com> <1271372682-21225-9-git-send-email-vaurora@redhat.com> <1271372682-21225-10-git-send-email-vaurora@redhat.com> <1271372682-21225-11-git-send-email-vaurora@redhat.com> <1271372682-21225-12-git-send-email-vaurora@redhat.com> <1271372682-21225-13-git-send-email-vaurora@redhat.com> <1271372682-21225-14-git-send-email-vaurora@redhat.com> <1271372682-21225-15-git-send-email-vaurora@redhat.com> <1271372682-21225-16-git-send-email-vaurora@redhat.com> <1271372682-21225-17-git-send-email-vaurora@redhat.com> <1271372682-21225-18-git-send-email-vaurora@redhat.com> <1271372682-21225-19-git-send-email-vaurora@redhat.com> <1271372682-21225-20-git-send-email-vaurora@redhat.com> <1271372682-21225-21-git-send-email-vaurora@redhat.com> <1271372682-21225-22-git-send-email-vaurora@redhat.com> <1271372682-21225-23-git-send-email-vaurora@redhat.com> <1271372682-21225-24-git-send-email-vaurora@redhat.com> <1271372682-21225-25-git-send-email-vaurora@redhat.com> <1271372682-21225-26-git-send-email-vaurora@redhat.com> <1271372682-21225-27-git-send-email-vaurora@redhat.com> <1271372682-21225-28-git-send-email-vaurora@redhat.com> <1271372682-21225-29-git-send-email-vaurora@redhat.com> <1271372682-21225-30-git-send-email-vaurora@redhat.com> <1271372682-21225-31-git-send-email-vaurora@redhat.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1556 Lines: 64 Proof-of-concept implementation of chown() for union mounts. --- fs/open.c | 24 +++++++++++++++++++++--- 1 files changed, 21 insertions(+), 3 deletions(-) diff --git a/fs/open.c b/fs/open.c index 686fcd2..325852d 100644 --- a/fs/open.c +++ b/fs/open.c @@ -30,6 +30,7 @@ #include #include #include +#include #include "internal.h" @@ -717,18 +718,35 @@ static int chown_common(struct path *path, uid_t user, gid_t group) SYSCALL_DEFINE3(chown, const char __user *, filename, uid_t, user, gid_t, group) { struct path path; + struct nameidata nd; + struct vfsmount *mnt; + char *tmp; int error; - error = user_path(filename, &path); + error = user_path_nd(AT_FDCWD, filename, LOOKUP_FOLLOW, + &nd, &path, &tmp); if (error) goto out; - error = mnt_want_write(path.mnt); + + if (IS_UNIONED_DIR(&nd.path)) + mnt = nd.path.mnt; + else + mnt = path.mnt; + + error = mnt_want_write(mnt); if (error) goto out_release; + + error = union_copyup(&nd, &path); + if (error) + goto out_drop_write; error = chown_common(&path, user, group); - mnt_drop_write(path.mnt); +out_drop_write: + mnt_drop_write(mnt); out_release: path_put(&path); + path_put(&nd.path); + putname(tmp); out: return error; } -- 1.6.3.3 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/