Re: Re: Re: Re: BUG in kernel: Wrong Handling of USBHDDâs in scsiglue(slave_configure) andscsi/sd(sd_read_cache_ =?windows-1252?Q?type=29
From: James Bottomley
Date: Wed Oct 05 2011 - 11:17:17 EST
On Wed, 2011-10-05 at 10:17 -0400, Alan Stern wrote:
> On Wed, 5 Oct 2011, Amit Sahrawat wrote:
> > Hi,
> > In order to verify the SYNC_CACHE command being passed.
> > First I checked on the USB HDD(Seagate - Free Agent) which is gettind
> > properly identified on linux. I performed - copy of a file and then
> > did 'Safely Remove Hardware" - this resulted in SYNC_CACHE command
> > being passed - All logs are captured for this.
> > Then, for the same Hard Disk - I checked for the behaviour on Windows.
> > There is no SYNC CACHE command being passed in this case.
> > Again, checked for a different hard disk(Seagate) - which has cache
> > but not shown in Linux. In that case also, there is no SYNC CACHE
> > command.
> > Please find the logs for the '3' cases attached.
> This is a little disappointing. If Windows doesn't use the SYNCHRONIZE
> CACHE command, it's quite likely that some USB drives will crash when
> they receive it.
> This strongly suggests that we should not change the current code.
I agree ... it means they go by the SCSI mode pages too, so we'll be no
worse than they are. Plus we don't risk upsetting the rest of the USB
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