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From: Alan Stern <stern-nwvwT67g6+6dFdvTe/nMLpVzexx5G7lz@public.gmane.org>
To: Oliver Neukum <oneukum-IBi9RG/b67k@public.gmane.org>
Cc: James Bottomley
	<James.Bottomley-d9PhHud1JfjCXq6kfMZ53/egYHeGw8Jk@public.gmane.org>,
	Greg KH <greg-U8xfFu+wG4EAvxtiuMwx3w@public.gmane.org>,
	Jun Itou <itou_jun-6LX5ZuzTTw53+QwDJ9on6Q@public.gmane.org>,
	Markus Rathgeb
	<maggu2810-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>,
	Matt <vickm78-PkbjNfxxIARBDgjK7y7TUQ@public.gmane.org>,
	SCSI development list
	<linux-scsi-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	USB Storage list
	<usb-storage-ijkIwGHArpdIPJnuZ7Njw4oP9KaGy4wf@public.gmane.org>,
	USB list <linux-usb-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>,
	Jens Axboe <axboe-tSWWG44O7X1aa/9Udqfwiw@public.gmane.org>,
	Dan Williams <dcbw-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>,
	brad <bradhaack-97jfqw80gc5zbRFIqnYvSA@public.gmane.org>
Subject: Re: [PATCH] USB: storage: add "no SYNCHRONIZE CACHE" quirk
Date: Tue, 15 Dec 2015 10:16:02 -0500 (EST)	[thread overview]
Message-ID: <Pine.LNX.4.44L0.1512151013320.1891-100000@iolanthe.rowland.org> (raw)
In-Reply-To: <1450179271.17387.19.camel-IBi9RG/b67k@public.gmane.org>

On Tue, 15 Dec 2015, Oliver Neukum wrote:

> On Thu, 2015-12-03 at 13:36 -0500, Alan Stern wrote:
> > This is an old problem, but it was never resolved and it still affects
> > people (Bugzilla #89511).  In short, there are USB-(S)ATA bridges that
> > claim to be write-back but don't support the SYNCHRONIZE CACHE
> > command.  
> > This causes errors when filesystems try to flush data out to the disk.
> 
> OK, maybe this is a stupid idea, but could we test the command as we
> enumerate the slave and store the result?

Maybe, although doing so within usb-storage would be kind of difficult
-- that driver is set up to forward requests from the SCSI layer, not
to generate requests of its own.  Besides, usb-storage doesn't know 
anything about write-back vs. write-through; only sd does.  I suppose 
sd could perform that test.

Alan Stern

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  parent reply	other threads:[~2015-12-15 15:16 UTC|newest]

Thread overview: 17+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2015-06-22 14:55 [PATCH] USB: storage: add "no SYNCHRONIZE CACHE" quirk Alan Stern
2015-06-22 15:43 ` James Bottomley
2015-06-22 17:30   ` Alan Stern
2015-06-22 17:36     ` James Bottomley
     [not found]       ` <1434994588.2237.90.camel-d9PhHud1JfjCXq6kfMZ53/egYHeGw8Jk@public.gmane.org>
2015-06-22 17:48         ` Alan Stern
2015-06-22 18:44           ` Markus Rathgeb
     [not found]             ` <CAOcK=COj7=akJUhsg2Pfr5aeh_tC9dEL3rZK1yKuvTN0KyJB1A-JsoAwUIsXosN+BqQ9rBEUg@public.gmane.org>
2015-06-22 20:16               ` Alan Stern
2015-06-22 21:32                 ` Markus Rathgeb
     [not found]           ` <Pine.LNX.4.44L0.1506221340180.1799-100000-IYeN2dnnYyZXsRXLowluHWD2FQJk+8+b@public.gmane.org>
2015-06-22 21:22             ` James Bottomley
     [not found]               ` <1435008177.2237.137.camel-d9PhHud1JfjCXq6kfMZ53/egYHeGw8Jk@public.gmane.org>
2015-07-24 15:19                 ` Alan Stern
2015-12-03 18:36               ` Alan Stern
2015-12-15 11:34                 ` Oliver Neukum
     [not found]                   ` <1450179271.17387.19.camel-IBi9RG/b67k@public.gmane.org>
2015-12-15 15:16                     ` Alan Stern [this message]
2015-06-23 14:15         ` David Laight
2015-06-26  9:43         ` Stefan Richter
2015-06-26 10:14           ` James Bottomley
2015-06-26 11:05             ` Stefan Richter

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