linux-kernel - RE: [EXT] [PATCH v4 3/3] scsi: ufs-bsg: Allow reading descriptors

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Date:   Thu, 31 Jan 2019 10:27:01 +0000
From:   "Bean Huo (beanhuo)" <beanhuo@...ron.com>
To:     Avri Altman <avri.altman@....com>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Evan Green <evgreen@...omium.org>
CC:     Avi Shchislowski <avi.shchislowski@....com>,
        Alex Lemberg <alex.lemberg@....com>
Subject: RE: [EXT] [PATCH v4 3/3] scsi: ufs-bsg: Allow reading descriptors

>-----Original Message-----
>From: linux-scsi-owner@...r.kernel.org [mailto:linux-scsi-
>owner@...r.kernel.org] On Behalf Of Avri Altman
>Sent: Sunday, January 27, 2019 8:08 AM
>To: James E.J. Bottomley <jejb@...ux.vnet.ibm.com>; Martin K. Petersen
><martin.petersen@...cle.com>; linux-scsi@...r.kernel.org; linux-
>kernel@...r.kernel.org; Evan Green <evgreen@...omium.org>
>Cc: Avi Shchislowski <avi.shchislowski@....com>; Alex Lemberg
><alex.lemberg@....com>; Avri Altman <avri.altman@....com>
>Subject: [EXT] [PATCH v4 3/3] scsi: ufs-bsg: Allow reading descriptors
>
>Add this functionality, placing the descriptor being read in the actual data buffer
>in the bio.
>
>That is, for both read and write descriptors query upiu, we are using the job's
>request_payload.  This in turn, is mapped back in user land to the applicable
>sg_io_v4 xferp: dout_xferp for write descriptor, and din_xferp for read descriptor.
>
>Signed-off-by: Avri Altman <avri.altman@....com>
Reviewed-by: Bean Huo <beanhuo@...ron.com>