linux-kernel - [PATCH 0/3] tcm: SYNCHRONIZE_CACHE emulation fixes and IBLOCK support

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Date:	Fri, 27 Aug 2010 23:53:42 -0700
From:	"Nicholas A. Bellinger" <nab@...ux-iscsi.org>
To:	linux-scsi <linux-scsi@...r.kernel.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Cc:	Christoph Hellwig <hch@....de>, Tejun Heo <teheo@...e.de>,
	FUJITA Tomonori <fujita.tomonori@....ntt.co.jp>,
	Mike Christie <michaelc@...wisc.edu>,
	Hannes Reinecke <hare@...e.de>,
	James Bottomley <James.Bottomley@...e.de>,
	Nicholas Bellinger <nab@...ux-iscsi.org>
Subject: [PATCH 0/3] tcm: SYNCHRONIZE_CACHE emulation fixes and IBLOCK support

From: Nicholas Bellinger <nab@...ux-iscsi.org>

Greetings hch, tejun and Co,

These patches are a follow up to the series posted recently for lio-core-2.6.git/lio-4.0
here:

[PATCH 0/4] tcm: Add WriteCache + FUA Write support to TCM/FILEIO
http://marc.info/?l=linux-scsi&m=128288359913333&w=2

The first and second patch follows hch's recommendation and remove the extra
'flush entire cache of device' struct se_subsystem_api->do_sync_cache() caller
from TCM Core in the original commit, and converts transport_generic_synchronize_cache()
and FILEIO dependent code to use struct se_subsystem_api->do_sync_cache_range()
for *both* the SYNCHRONIZE_CACHE emulation cases of 'per LBA + Number of Blocks Range'
flush and 'flush entrire cache of device' op.

The third patch in the series adds new support for WriteCache and FUA WRITE emulation
into the TCM/IBLOCK subsystem plugin using block/blk-barrier.c:blkdev_issue_flush()
w/ BLKDEV_IFL_WAIT flag.  Note that since blkdev_issue_flush() does not support a
LBA + Range flush, all TCM/IBLOCK SYNCHRONIZE_CACHE and FUA WRITE ops involving a
LBA + Range are converted into a global device cache flush op w/ blkdev_issue_flush().

Many thanks again to hch for his guidence in this area,

Signed-off-by: Nicholas A. Bellinger <nab@...ux-iscsi.org>

Nicholas Bellinger (3):
  tcm/fileio: Remove struct se_subsystem_api->do_sync_cache() usage
  tcm: Remove struct se_subsystem_api->do_sync_cache()
  tcm/iblock: Add WriteCache and Forced Unit Access WRITE emulation

 drivers/target/target_core_file.c      |   31 ++++----
 drivers/target/target_core_iblock.c    |  119 ++++++++++++++++++++++++++++++-
 drivers/target/target_core_iblock.h    |    1 +
 drivers/target/target_core_transport.c |   21 +-----
 include/target/target_core_transport.h |    7 --
 5 files changed, 135 insertions(+), 44 deletions(-)

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