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From: Arnd Bergmann <arnd@arndb.de>
To: Christoph Hellwig <hch@infradead.org>
Cc: Jens Axboe <axboe@kernel.dk>,
	"James E.J. Bottomley" <jejb@linux.ibm.com>,
	"Martin K. Petersen" <martin.petersen@oracle.com>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	Douglas Gilbert <dgilbert@interlog.com>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	y2038 Mailman List <y2038@lists.linaro.org>,
	Steffen Maier <maier@linux.ibm.com>,
	linux-scsi <linux-scsi@vger.kernel.org>,
	Chaitanya Kulkarni <chaitanya.kulkarni@wdc.com>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	linux-block <linux-block@vger.kernel.org>
Subject: Re: [PATCH 02/24] compat: scsi: sg: fix v3 compat read/write interface
Date: Thu, 12 Dec 2019 18:34:22 +0100
Message-ID: <CAK8P3a1AmFAL3qOe3vt-i2L2hjovHhfjSYCyyLHO4ghGAwNZuA@mail.gmail.com> (raw)
In-Reply-To: <20191212162506.GA27991@infradead.org>

On Thu, Dec 12, 2019 at 5:25 PM Christoph Hellwig <hch@infradead.org> wrote:
> On Wed, Dec 11, 2019 at 09:42:36PM +0100, Arnd Bergmann wrote:

> > --- a/drivers/scsi/sg.c
> > +++ b/drivers/scsi/sg.c
> > @@ -198,6 +198,7 @@ static void sg_device_destroy(struct kref *kref);
> >
> >  #define SZ_SG_HEADER sizeof(struct sg_header)
> >  #define SZ_SG_IO_HDR sizeof(sg_io_hdr_t)
> > +#define SZ_COMPAT_SG_IO_HDR sizeof(struct compat_sg_io_hdr)
>
> I'd rather not add more defines like this.  The raw sizeof is
> much more readable and obvious.

Done. I actually had it that way in the previous submission and then changed
it for consistency. I considered removing SZ_SG_IO_HDR as well,
but decided not to make Doug's life harder than necessary -- he has nother
50 or so patches on top of this that he needs to rebase.

> I find the structure here a little confusing, as it doesn't follow
> the normal flow.  What do you think of:
>
>         if (count >= SZ_SG_HEADER) {
>                 if (get_user(reply_len, &old_hdr->reply_len))
>                         return -EFAULT;

I don't see much benefit either way. Changed it now it as you suggested.

Thanks for the review!

      Arnd

  reply index

Thread overview: 36+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-11 20:42 [PATCH 00/24] block, scsi: final compat_ioctl cleanup Arnd Bergmann
2019-12-11 20:42 ` [PATCH 02/24] compat: scsi: sg: fix v3 compat read/write interface Arnd Bergmann
2019-12-12 16:25   ` Christoph Hellwig
2019-12-12 17:34     ` Arnd Bergmann [this message]
2019-12-11 20:42 ` [PATCH 03/24] compat_ioctl: block: handle BLKREPORTZONE/BLKRESETZONE Arnd Bergmann
2019-12-12  1:20   ` Damien Le Moal
2019-12-11 20:42 ` [PATCH 04/24] compat_ioctl: block: handle BLKGETZONESZ/BLKGETNRZONES Arnd Bergmann
2019-12-12  1:20   ` Damien Le Moal
2019-12-11 20:42 ` [PATCH 05/24] compat_ioctl: block: handle add zone open, close and finish ioctl Arnd Bergmann
2019-12-12  1:20   ` Damien Le Moal
2019-12-11 20:42 ` [PATCH 06/24] compat_ioctl: block: handle Persistent Reservations Arnd Bergmann
2019-12-11 20:42 ` [PATCH 07/24] compaT_ioctl: ubd, aoe: use blkdev_compat_ptr_ioctl Arnd Bergmann
2019-12-11 20:42 ` [PATCH 08/24] compat_ioctl: move CDROM_SEND_PACKET handling into scsi Arnd Bergmann
2019-12-11 20:42 ` [PATCH 09/24] compat_ioctl: move CDROMREADADIO to cdrom.c Arnd Bergmann
2019-12-11 20:42 ` [PATCH 10/24] compat_ioctl: cdrom: handle CDROM_LAST_WRITTEN Arnd Bergmann
2019-12-17 15:20   ` [Y2038] " Ben Hutchings
2019-12-17 21:38     ` Arnd Bergmann
2019-12-11 20:42 ` [PATCH 11/24] compat_ioctl: block: handle cdrom compat ioctl in non-cdrom drivers Arnd Bergmann
2019-12-11 20:42 ` [PATCH 13/24] compat_ioctl: bsg: add handler Arnd Bergmann
2019-12-11 20:42 ` [PATCH 15/24] compat_ioctl: scsi: move ioctl handling into drivers Arnd Bergmann
2019-12-11 23:05   ` Michael S. Tsirkin
2019-12-12  0:28     ` Paolo Bonzini
2019-12-12  9:17       ` Arnd Bergmann
2019-12-12 10:27       ` Michael S. Tsirkin
2019-12-12 16:27       ` Christoph Hellwig
2019-12-12 16:35         ` Jens Axboe
2019-12-12 10:25   ` Michael S. Tsirkin
2019-12-11 20:42 ` [PATCH 18/24] compat_ioctl: move cdrom commands into cdrom.c Arnd Bergmann
2019-12-11 20:42 ` [PATCH 20/24] compat_ioctl: move HDIO ioctl handling into drivers/ide Arnd Bergmann
2019-12-12 16:29   ` Christoph Hellwig
2019-12-12 17:21     ` Arnd Bergmann
2019-12-11 20:42 ` [PATCH 21/24] compat_ioctl: block: move blkdev_compat_ioctl() into ioctl.c Arnd Bergmann
2019-12-12 16:30   ` Christoph Hellwig
2019-12-12 17:24     ` Arnd Bergmann
2019-12-11 20:42 ` [PATCH 22/24] compat_ioctl: block: simplify compat_blkpg_ioctl() Arnd Bergmann
2019-12-11 20:42 ` [PATCH 23/24] compat_ioctl: simplify up block/ioctl.c Arnd Bergmann

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