Re: [PATCH 1/2] block: Zoned block device single-threaded submission

2017-08-07 Thread Damien Le Moal
Chistoph, On 8/5/17 20:34, Christoph Hellwig wrote: > We'll need a blk-mq version as well, otherwise: NAK. Not that I have not tried, but I do not see how this is possible without in the end making blk-mq/scsi-mq for a ZBC disk work exactly like the sq path, that is adding locks/barriers in many

Re: [PATCH 1/2] block: Zoned block device single-threaded submission

2017-08-05 Thread Christoph Hellwig
We'll need a blk-mq version as well, otherwise: NAK.

Re: [PATCH 1/2] block: Zoned block device single-threaded submission

2017-08-04 Thread Bart Van Assche
On Fri, 2017-08-04 at 16:52 +0900, Damien Le Moal wrote: > From: Hannes Reinecke > > The scsi_request_fn() dispatch function internally unlocks the request > queue before submitting a request to the underlying LLD. This can > potentially lead to write request reordering if the