Return-Path: Received: from mail-wg0-f42.google.com ([74.125.82.42]:36441 "EHLO mail-wg0-f42.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752744AbbC0QwT (ORCPT ); Fri, 27 Mar 2015 12:52:19 -0400 From: Andreas Gruenbacher To: linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-nfs@vger.kernel.org Cc: Andreas Gruenbacher Subject: [RFC 28/39] richacl: Create richacl from mode values Date: Fri, 27 Mar 2015 17:50:26 +0100 Message-Id: <12503bb14bb098b6b3ad7b1c0bf6de8d05b48d6b.1427471526.git.agruenba@redhat.com> In-Reply-To: References: In-Reply-To: References: Sender: linux-nfs-owner@vger.kernel.org List-ID: Create a richacl that corresponds to given file mode permission bits. Signed-off-by: Andreas Gruenbacher --- fs/richacl_compat.c | 35 +++++++++++++++++++++++++++++++++++ include/linux/richacl.h | 1 + 2 files changed, 36 insertions(+) diff --git a/fs/richacl_compat.c b/fs/richacl_compat.c index 981bd49..8454621 100644 --- a/fs/richacl_compat.c +++ b/fs/richacl_compat.c @@ -747,3 +747,38 @@ richacl_apply_masks(struct richacl **acl) return retval; } EXPORT_SYMBOL_GPL(richacl_apply_masks); + +/** + * richacl_from_mode - create an acl which corresponds to @mode + * @mode: file mode including the file type + */ +struct richacl * +richacl_from_mode(mode_t mode) +{ + struct richacl *acl; + struct richace *ace; + + acl = richacl_alloc(1, GFP_KERNEL); + if (!acl) + return NULL; + acl->a_flags = RICHACL_MASKED; + acl->a_owner_mask = richacl_mode_to_mask(mode >> 6) | + RICHACE_POSIX_OWNER_ALLOWED; + acl->a_group_mask = richacl_mode_to_mask(mode >> 3); + acl->a_other_mask = richacl_mode_to_mask(mode); + + ace = acl->a_entries; + ace->e_type = RICHACE_ACCESS_ALLOWED_ACE_TYPE; + ace->e_flags = RICHACE_SPECIAL_WHO; + ace->e_mask = RICHACE_POSIX_ALWAYS_ALLOWED | + RICHACE_POSIX_MODE_ALL | + RICHACE_POSIX_OWNER_ALLOWED; + /* RICHACE_DELETE_CHILD is meaningless for non-directories. */ + if (!S_ISDIR(mode)) + ace->e_mask &= ~RICHACE_DELETE_CHILD; + ace->e_id.special = RICHACE_EVERYONE_SPECIAL_ID; + + return acl; + +} +EXPORT_SYMBOL_GPL(richacl_from_mode); diff --git a/include/linux/richacl.h b/include/linux/richacl.h index 1a07ea0..cda945a 100644 --- a/include/linux/richacl.h +++ b/include/linux/richacl.h @@ -325,5 +325,6 @@ extern struct richacl *richacl_create(struct inode *, struct inode *); /* richacl_compat.c */ extern int richacl_apply_masks(struct richacl **); +extern struct richacl *richacl_from_mode(mode_t); #endif /* __RICHACL_H */ -- 2.1.0