From mboxrd@z Thu Jan 1 00:00:00 1970 From: Douglas Gilbert Subject: [PATCH v2 0/5] scsi_debug: add write scattered support Date: Wed, 13 Dec 2017 20:40:11 -0500 Message-ID: <20171214014016.13142-1-dgilbert@interlog.com> Return-path: Received: from smtp.infotech.no ([82.134.31.41]:40145 "EHLO smtp.infotech.no" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751029AbdLNBkW (ORCPT ); Wed, 13 Dec 2017 20:40:22 -0500 Sender: linux-scsi-owner@vger.kernel.org List-Id: linux-scsi@vger.kernel.org To: linux-scsi@vger.kernel.org Cc: martin.petersen@oracle.com, bart.vanassche@sandisk.com, hare@suse.de While testing the WRITE SCATTERED command support in a new sg3_utils utility (sg_write_x) it was helpful to have a target that supported this command. This command might be attractive to other kernel subsystems. Even if end devices don't support this command yet, it would most likely be a performance win if SCSI LLDs supported it (by breaking it down to a series of WRITE commands), as that would cut down the overhead of the block layer, the ULD (e.g. sd) and the SCSI midlevel. Changes since original version: - fix problem when fake_rw=1, identify media access commands better with following rename - rename FF_DIRECT_IO to FF_MEDIA_IO - apply reviewer suggestions (Bart Van Assche) - expand in-code comments Douglas Gilbert (5): scsi_debug: tab, kstrto changes scsi_debug: fix group_number mask scsi_debug: do_device_access, add sg offset argument scsi_debug: ARRAY_SIZE() and FF_MEDIA_IO scsi_debug: add resp_write_scat function drivers/scsi/scsi_debug.c | 544 +++++++++++++++++++++++++++++++--------------- 1 file changed, 369 insertions(+), 175 deletions(-) -- 2.14.1