Re: [RFC PATCH 2/2] usb: storage: scsiglue: limit USB3 devices to 2048 sectors

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On Thu, 5 Nov 2015, Felipe Balbi wrote:

> Hi,
> 
> Oliver Neukum <oneukum@xxxxxxxx> writes:
> > On Wed, 2015-11-04 at 16:26 -0500, Alan Stern wrote:
> >> This doesn't need to be stored as one of the usb-storage flags.  And
> >> since we are close to running out of flag bits (on 32-bit
> >> architectures), it would be better not to use one of them for this.
> >
> > Do we want the opposite flag? 25% for known good devices
> > is visible.
> 
> You mean for USB2 devices ? I was thinking about that last night and
> wanted to "whitelist" at least our own mass storage gadget, provided
> that it works just fine with anything you give it (so far).
> 
> Something like US_FL_NO_SECTOR_LIMIT ?

There already is a whitelist flag for the Mass Storage gadget:  
US_FL_CAPACITY_OK.  Right now its meaning is limited to the READ
CAPACITY bug, but it could easily be repurposed since no other 
whitelist entries use that flag.

Alan Stern

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