linux-kernel - [PATCH 0/2] Bio flags use zone cache when available.

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Date:	Wed,  3 Aug 2016 14:06:43 -0500
From:	Shaun Tancheff <shaun@...cheff.com>
To:	linux-block@...r.kernel.org, linux-scsi@...r.kernel.org,
	linux-kernel@...r.kernel.org
Cc:	Shaun Tancheff <shaun@...cheff.com>, Jens Axboe <axboe@...nel.dk>,
	Jens Axboe <axboe@...com>, Christoph Hellwig <hch@....de>,
	"James E . J . Bottomley" <jejb@...ux.vnet.ibm.com>,
	"Martin K . Petersen" <martin.petersen@...cle.com>,
	Josh Bingaman <josh.bingaman@...gate.com>,
	Hannes Reinecke <hare@...e.de>,
	Damien Le Moal <damien.lemoal@...t.com>
Subject: [PATCH 0/2] Bio flags use zone cache when available.

Hi,

As per Christoph's request this patch incorporates Hannes' cache of zone
information.

The approach is to provide the same blkreport format as would be done 
when BLK_DEV_ZONED is not enabled via an ioctl.
Reset WP, Open, and Close zone will update the zone cache.

Using blkdev_issue_zone_report() from within the kernel the report
will still come directly from the media. I am considering an option
for the ioctl to force pulling the zone report from the media when
BLK_DEV_ZONED is enabled and using the resulting information to
refresh the zone cache. It is not clear that this is useful so I
have not included that in this patch.

The follow-on patch just enables the zone cache to be populated
using a Seagate's HostAware drive.

This series is based off of Linus current tip post (f38d2e5313f0af..)
and builds on top of the previous series of block layer support:
    Add ioctl to issue ZBC/ZAC commands via block layer
    Add bio/request flags to issue ZBC/ZAC commands

as well as the series post by Hannes'
    sd_zbc: Fix handling of ZBC read after write pointer
    sd: Limit messages for ZBC disks capacity change
    sd: Implement support for ZBC devices
    sd: Implement new RESET_WP provisioning mode
    sd: configure ZBC devices
...    

Cc: Hannes Reinecke <hare@...e.de>
Cc: Damien Le Moal <damien.lemoal@...t.com>

Shaun Tancheff (2):
  bio/zbc support for zone cache
  Enable support for Seagate HostAware drives (testing).

 block/blk-lib.c        |   3 +-
 block/blk-zoned.c      | 190 +++++++++++++++++++++++++++++++++++++++++++++++++
 block/ioctl.c          |  39 +++++++---
 drivers/scsi/sd.c      |  22 +++---
 drivers/scsi/sd.h      |  20 ++++--
 drivers/scsi/sd_zbc.c  | 150 ++++++++++++++++++++++++++++++++------
 include/linux/blkdev.h |  14 +++-
 7 files changed, 389 insertions(+), 49 deletions(-)

-- 
2.8.1




    sd_zbc: Fix handling of ZBC read after write pointer
    sd: Limit messages for ZBC disks capacity change
    sd: Implement support for ZBC devices
    sd: Implement new RESET_WP provisioning mode
    sd: configure ZBC devices
    block: Add 'BLK_MQ_RQ_QUEUE_DONE' return value
    block: Introduce BLKPREP_DONE
    block: Add 'zoned' sysfs queue attribute
    block: Implement support for zoned block devices
    block: update chunk_sectors in blk_stack_limits()
    blk-sysfs: Add 'chunk_sectors' to sysfs attributes
    sd: configure ZBC devices
    block: Add 'BLK_MQ_RQ_QUEUE_DONE' return value
    block: Introduce BLKPREP_DONE
    block: Add 'zoned' sysfs queue attribute
    block: Implement support for zoned block devices
    block: update chunk_sectors in blk_stack_limits()
    blk-sysfs: Add 'chunk_sectors' to sysfs attributes