From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from eu-smtp-delivery-151.mimecast.com ([207.82.80.151]:57574 "EHLO eu-smtp-delivery-151.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728091AbgHGJin (ORCPT ); Fri, 7 Aug 2020 05:38:43 -0400 From: David Laight Subject: RE: [PATCH 3/3] quota: simplify the quotactl compat handling Date: Fri, 7 Aug 2020 09:38:38 +0000 Message-ID: References: <20200731122202.213333-1-hch@lst.de> <20200731122202.213333-4-hch@lst.de> In-Reply-To: <20200731122202.213333-4-hch@lst.de> Content-Language: en-US MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8BIT Sender: linux-arch-owner@vger.kernel.org List-ID: To: 'Christoph Hellwig' , "x86@kernel.org" , Jan Kara Cc: "linux-arm-kernel@lists.infradead.org" , "linux-fsdevel@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-api@vger.kernel.org" , "linux-arch@vger.kernel.org" , Jan Kara Message-ID: <20200807093838.xfI6UuXEEW8sJOtWsQrWYBVL8nc230mv-F8QFd6OvU8@z> From: Christoph Hellwig > Sent: 31 July 2020 13:22 > > Fold the misaligned u64 workarounds into the main quotactl flow instead > of implementing a separate compat syscall handler. > ... > +static int compat_copy_fs_quota_stat(struct compat_fs_quota_stat __user *to, > + struct fs_quota_stat *from) > +{ > + if (put_user(from->qs_version, &to->qs_version) || > + put_user(from->qs_flags, &to->qs_flags) || > + put_user(from->qs_pad, &to->qs_pad) || > + compat_copy_fs_qfilestat(&to->qs_uquota, &from->qs_uquota) || > + compat_copy_fs_qfilestat(&to->qs_gquota, &from->qs_gquota) || > + put_user(from->qs_incoredqs, &to->qs_incoredqs) || > + put_user(from->qs_btimelimit, &to->qs_btimelimit) || > + put_user(from->qs_itimelimit, &to->qs_itimelimit) || > + put_user(from->qs_rtbtimelimit, &to->qs_rtbtimelimit) || > + put_user(from->qs_bwarnlimit, &to->qs_bwarnlimit) || > + put_user(from->qs_iwarnlimit, &to->qs_iwarnlimit)) > + return -EFAULT; > + return 0; > +} That might look better as a 'noinline' function that copied all the fields into an on-stack struct compat_fs_quota_stat and then did a single copy_to_user(). (I do 'like' qs_pad - I wonder what the person who added it was smoking.) David - Registered Address Lakeside, Bramley Road, Mount Farm, Milton Keynes, MK1 1PT, UK Registration No: 1397386 (Wales)