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From: Christoph Hellwig <hch@lst.de>
To: Tom Yan <tom.ty89@gmail.com>
Cc: Christoph Hellwig <hch@lst.de>,
	linux-scsi@vger.kernel.org, dgilbert@interlog.com,
	Bart Van Assche <bvanassche@acm.org>,
	Alan Stern <stern@rowland.harvard.edu>,
	akinobu.mita@gmail.com, linux-api@vger.kernel.org
Subject: Re: [PATCH RESEND 2/4] scsi: sg: implement BLKSSZGET
Date: Thu, 10 Sep 2020 07:28:35 +0200	[thread overview]
Message-ID: <20200910052835.GB18283@lst.de> (raw)
In-Reply-To: <CAGnHSE=ASs3DG2yp1NpODHimwxHe+=XPRsOyDdkB3ThtyEU-KA@mail.gmail.com>

On Thu, Sep 10, 2020 at 09:59:05AM +0800, Tom Yan wrote:
> If we rename it to e.g. SG_GET_MAX_XFER_BYTES, it will still break
> applications unless we also keep the wrong/ugly/confusing name (and
> you lose the advantage/generality that the two ioctls can be used on
> both sg and "pure" block devices; which seems to be the case of some
> SG_* ioctls as well).

How is that an advantage?  Applications that works with block devices
don't really work with a magic passthrough character device.

> I don't really care enough though. I mean, I'm okay with
> SG_GET_MAX_XFER_BYTES *and* NO "improper" BLKSECTGET. If that will get
> the patch series in, I am willing to send a new version. If not, I'm
> just gonna drop this.

You must assume that there are applications already that depend in the
"weird" BLKSECTGET on sg, given that it has been around so long.  Any
change to the semantics will break them.

  reply	other threads:[~2020-09-10  5:28 UTC|newest]

Thread overview: 44+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-09-04  4:42 About BLKSECTGET in sg Tom Yan
2020-09-04 16:28 ` Douglas Gilbert
2020-09-04 19:21   ` Tom Yan
2020-09-04 20:05     ` [PATCH 1/4] scsi: sg: fix BLKSECTGET ioctl Tom Yan
2020-09-04 20:05       ` [PATCH 2/4] scsi: sg: implement BLKSSZGET Tom Yan
2020-09-05 18:37         ` Douglas Gilbert
2020-09-04 20:05       ` [PATCH 3/4] scsi: sg: use queue_logical_sector_size() in max_sectors_bytes() Tom Yan
2020-09-05 18:37         ` Douglas Gilbert
2020-09-04 20:05       ` [PATCH 4/4] block/scsi_ioctl.c: " Tom Yan
2020-09-05 18:37         ` Douglas Gilbert
2020-09-05 18:37       ` [PATCH 1/4] scsi: sg: fix BLKSECTGET ioctl Douglas Gilbert
2020-09-05 19:32       ` Bart Van Assche
2020-09-05 20:36         ` Douglas Gilbert
2020-09-06  1:19           ` Tom Yan
2020-09-06  1:25             ` [PATCH RESEND " Tom Yan
2020-09-06  1:25               ` [PATCH RESEND 2/4] scsi: sg: implement BLKSSZGET Tom Yan
2020-09-06  1:25               ` [PATCH RESEND 3/4] scsi: sg: use queue_logical_sector_size() in max_sectors_bytes() Tom Yan
2020-09-06  1:25               ` [PATCH RESEND 4/4] block/scsi_ioctl.c: " Tom Yan
2020-09-06  1:27             ` [PATCH RESEND 1/4] scsi: sg: fix BLKSECTGET ioctl Tom Yan
2020-09-06  1:27               ` [PATCH RESEND 2/4] scsi: sg: implement BLKSSZGET Tom Yan
2020-09-07  6:09                 ` Christoph Hellwig
2020-09-07  9:01                   ` Tom Yan
2020-09-08  8:42                     ` Christoph Hellwig
2020-09-10  1:59                       ` Tom Yan
2020-09-10  5:28                         ` Christoph Hellwig [this message]
2020-09-11  2:52                           ` Tom Yan
2020-09-11  6:48                             ` Christoph Hellwig
2020-09-11 17:52                               ` Douglas Gilbert
2020-09-11 21:33                                 ` Alan Stern
2020-09-16  5:47                               ` Tom Yan
2020-09-06  1:27               ` [PATCH RESEND 3/4] scsi: sg: use queue_logical_sector_size() in max_sectors_bytes() Tom Yan
2020-09-06  6:26                 ` Greg KH
2020-09-06  7:01                   ` Tom Yan
2020-09-06  7:40                     ` [PATCH v2 1/4] scsi: sg: fix BLKSECTGET ioctl Tom Yan
2020-09-06  7:40                       ` [PATCH v2 2/4] scsi: sg: implement BLKSSZGET Tom Yan
2020-09-06  7:40                       ` [PATCH v2 3/4] scsi: sg: use queue_logical_sector_size() in max_sectors_bytes() Tom Yan
2020-09-06  7:40                       ` [PATCH v2 4/4] block/scsi_ioctl.c: " Tom Yan
2020-09-06  7:51                     ` [PATCH v3 1/4] scsi: sg: fix BLKSECTGET ioctl Tom Yan
2020-09-06  7:51                       ` [PATCH v3 2/4] scsi: sg: implement BLKSSZGET Tom Yan
2020-09-06  7:51                       ` [PATCH v3 3/4] scsi: sg: use queue_logical_sector_size() in max_sectors_bytes() Tom Yan
2020-09-06  7:51                       ` [PATCH v3 4/4] block/scsi_ioctl.c: " Tom Yan
2020-09-06  1:27               ` [PATCH RESEND " Tom Yan
2020-09-06  5:09             ` [PATCH 1/4] scsi: sg: fix BLKSECTGET ioctl Douglas Gilbert
2020-09-06  7:16               ` Tom Yan

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