Messages in this thread | | | Date | Wed, 24 Nov 2010 09:48:11 -0500 | From | Christoph Hellwig <> | Subject | Re: [PATCH repost 3] [SCSI] Retrieve the Caching mode page |
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On Wed, Nov 24, 2010 at 10:10:29AM +0000, James Bottomley wrote: > The final question is is it worth it? Since USB devices are supposed to > be hot unpluggable, surely a USB device with a write back cache would be > a disaster: no-one will SYNC the cache on a surprise unplug anyway ... > therefore there shouldn't really be any of them surviving in the wild > (famous last words, I suppose).
There's tons of USB devices with writeback caches. Recent windows version tend to use the FUA bit a lot because of this. And the linux usb storage target implementation thus has a hook to ignore the FUA bit, and it's probably not the only one..
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