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Message-Id: <1281977523-19335-1-git-send-email-tj@kernel.org> Date: Mon, 16 Aug 2010 18:51:58 +0200 From: Tejun Heo <tj@...nel.org> To: jaxboe@...ionio.com, linux-fsdevel@...r.kernel.org, linux-scsi@...r.kernel.org, linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org, linux-raid@...r.kernel.org, hch@....de, James.Bottomley@...e.de, tytso@....edu, chris.mason@...cle.com, swhiteho@...hat.com, konishi.ryusuke@....ntt.co.jp, dm-devel@...hat.com, vst@...b.net, jack@...e.cz, rwheeler@...hat.com, hare@...e.de, neilb@...e.de, rusty@...tcorp.com.au, mst@...hat.com Subject: [RFC PATCHSET block#for-2.6.36-post] block: convert to REQ_FLUSH/FUA Hello, This patchset contains five patches to convert block drivers implementing REQ_HARDBARRIER to support REQ_FLUSH/FUA. 0001-block-loop-implement-REQ_FLUSH-FUA-support.patch 0002-virtio_blk-implement-REQ_FLUSH-FUA-support.patch 0003-lguest-replace-VIRTIO_F_BARRIER-support-with-VIRTIO_.patch 0004-md-implment-REQ_FLUSH-FUA-support.patch 0005-dm-implement-REQ_FLUSH-FUA-support.patch I'm fairly sure about conversions 0001-0003. 0004 should be okay although multipath wasn't tested. 0005, I'm not quite sure about. It works fine for the tests I've done but there are many other targets and code paths that I didn't test. So, please be careful with the last patch. I think it would be best to route the last two through the respective md/dm trees after the core part is merged and pulled into those trees. The nice thing about the conversion is that in many cases it replaces postflush with FUA writes which can be handled by request queues lower in the chain. For md/dm, this replaces an array wide cacheflush with FUA writes to only affected member devices. After this patchset, the followings remain to be converted. * blktrace * scsi_error.c for some reason tests REQ_HARDBARRIER. I think this part can be dropped altogether but am not sure. * drbd and xen. I have no idea. These patches are on top of block#for-2.6.36-post (c047ab2dddeeafbd6f7c00e45a13a5c4da53ea0b) + block-replace-barrier-with-sequenced-flush patchset[1] + block-fix-incorrect-bio-request-flag-conversion-in-md patch[2] and available in the following git tree. git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc.git flush-fua and contain the following changes. Documentation/lguest/lguest.c | 36 +++----- drivers/block/loop.c | 18 ++-- drivers/block/virtio_blk.c | 26 ++--- drivers/md/dm-crypt.c | 2 drivers/md/dm-io.c | 20 ---- drivers/md/dm-log.c | 2 drivers/md/dm-raid1.c | 8 - drivers/md/dm-region-hash.c | 16 +-- drivers/md/dm-snap-persistent.c | 2 drivers/md/dm-snap.c | 6 - drivers/md/dm-stripe.c | 2 drivers/md/dm.c | 180 ++++++++++++++++++++-------------------- drivers/md/linear.c | 4 drivers/md/md.c | 117 +++++--------------------- drivers/md/md.h | 23 +---- drivers/md/multipath.c | 4 drivers/md/raid0.c | 4 drivers/md/raid1.c | 175 +++++++++++++------------------------- drivers/md/raid1.h | 2 drivers/md/raid10.c | 7 - drivers/md/raid5.c | 38 ++++---- drivers/md/raid5.h | 1 include/linux/virtio_blk.h | 6 + 23 files changed, 278 insertions(+), 421 deletions(-) -- tejun [1] http://thread.gmane.org/gmane.linux.kernel/1022363 [2] http://thread.gmane.org/gmane.linux.kernel/1023435 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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