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    Subject[PATCHSET 2.6.36-rc2] block, fs: replace HARDBARRIER with FLUSH/FUA
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    Hello,

    This patchset is combination of the following three patchset.

    [1] block: replace barrier with sequenced flush
    [2] block: convert to REQ_FLUSH/FUA
    [3] replace barriers with explicit flush / FUA usage

    Changes from the previous postings are,

    * Rebased on top of 2.6.36-rc2 (502adf5778f4151dcba3f64dd6ed322151f3712c)

    * Acked/Reviewed-by's added.

    * ide-remove-unnecessary-blk_queue_flushing-test-in-do_ide_request
    patch added which removes blk_queue_flushing().

    * BH flags, which are no longer necessary on 2.6.36-rc2, are dropped
    from fs-block-propagate-REQ_FLUSH-FUA-interface-to-upper-layers and
    the patch is collapsed into
    block-implement-REQ_FLUSH-FUA-based-interface-for-FLUSH-FUA-requests.

    * block-filter-flush-bio-s-in-__generic_make_request added. This
    makes sure make_request based drivers which don't implement cache
    flushes don't see REQ_FLUSH/FUA requests.

    * block-simplify-queue_next_fseq added.

    * REQ_FUA support dropped from virtio/lguest conversion as suggested
    by Christoph.

    * md conversion updated as suggested by Neil Brown.

    * dm conversion is excluded for now.

    * block-remove-the-BLKDEV_IFL_BARRIER-flag patch now also removes
    DISCARD_SECURE.

    * block-remove-the-write-barrier-flag patch excluded for now (pending
    on dm conversion).

    I've audited all make_request drivers and after this patchset only
    blktrace, dm, drbd and xen need more work. I'll work on blktrace and
    dm but leave xen and drbd for the respective maintainers.

    Build tested w/ allmodconfig and lightly tested w/ ext4 and xfs.

    This patchst contains the following thirty patches.

    0001-ide-remove-unnecessary-blk_queue_flushing-test-in-do.patch
    0002-block-loop-queue-ordered-mode-should-be-DRAIN_FLUSH.patch
    0003-block-kill-QUEUE_ORDERED_BY_TAG.patch
    0004-block-deprecate-barrier-and-replace-blk_queue_ordere.patch
    0005-block-remove-spurious-uses-of-REQ_HARDBARRIER.patch
    0006-block-misc-cleanups-in-barrier-code.patch
    0007-block-drop-barrier-ordering-by-queue-draining.patch
    0008-block-rename-blk-barrier.c-to-blk-flush.c.patch
    0009-block-rename-barrier-ordered-to-flush.patch
    0010-block-implement-REQ_FLUSH-FUA-based-interface-for-FL.patch
    0011-block-filter-flush-bio-s-in-__generic_make_request.patch
    0012-block-use-REQ_FLUSH-in-blkdev_issue_flush.patch
    0013-block-simplify-queue_next_fseq.patch
    0014-block-loop-implement-REQ_FLUSH-FUA-support.patch
    0015-virtio_blk-drop-REQ_HARDBARRIER-support.patch
    0016-lguest-replace-VIRTIO_F_BARRIER-support-with-VIRTIO_.patch
    0017-md-implment-REQ_FLUSH-FUA-support.patch
    0018-block-pass-gfp_mask-and-flags-to-sb_issue_discard.patch
    0019-xfs-replace-barriers-with-explicit-flush-FUA-usage.patch
    0020-btrfs-replace-barriers-with-explicit-flush-FUA-usage.patch
    0021-gfs2-replace-barriers-with-explicit-flush-FUA-usage.patch
    0022-reiserfs-replace-barriers-with-explicit-flush-FUA-us.patch
    0023-nilfs2-replace-barriers-with-explicit-flush-FUA-usag.patch
    0024-jbd-replace-barriers-with-explicit-flush-FUA-usage.patch
    0025-jbd2-replace-barriers-with-explicit-flush-FUA-usage.patch
    0026-ext4-do-not-send-discards-as-barriers.patch
    0027-fat-do-not-send-discards-as-barriers.patch
    0028-swap-do-not-send-discards-as-barriers.patch
    0029-block-remove-the-BLKDEV_IFL_BARRIER-flag.patch
    0030-block-remove-the-BH_Eopnotsupp-flag.patch

    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 | 29 --
    block/Makefile | 2
    block/blk-barrier.c | 350 ------------------------------------
    block/blk-core.c | 68 +++---
    block/blk-flush.c | 242 ++++++++++++++++++++++++
    block/blk-lib.c | 18 -
    block/blk-settings.c | 20 ++
    block/blk.h | 8
    block/elevator.c | 79 --------
    drivers/block/brd.c | 1
    drivers/block/loop.c | 20 +-
    drivers/block/osdblk.c | 5
    drivers/block/pktcdvd.c | 1
    drivers/block/ps3disk.c | 2
    drivers/block/virtio_blk.c | 37 ---
    drivers/block/xen-blkfront.c | 47 +---
    drivers/ide/ide-disk.c | 13 -
    drivers/ide/ide-io.c | 13 -
    drivers/md/dm.c | 2
    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 | 43 ++--
    drivers/md/raid5.h | 1
    drivers/mmc/card/queue.c | 1
    drivers/s390/block/dasd.c | 1
    drivers/scsi/aic7xxx_old.c | 21 --
    drivers/scsi/libsas/sas_scsi_host.c | 13 -
    drivers/scsi/sd.c | 18 -
    fs/btrfs/disk-io.c | 19 -
    fs/btrfs/extent-tree.c | 2
    fs/btrfs/volumes.c | 4
    fs/btrfs/volumes.h | 1
    fs/buffer.c | 7
    fs/ext4/mballoc.c | 3
    fs/fat/fatent.c | 4
    fs/fat/misc.c | 5
    fs/gfs2/log.c | 19 -
    fs/gfs2/rgrp.c | 5
    fs/jbd/commit.c | 30 ---
    fs/jbd2/commit.c | 43 ----
    fs/nilfs2/super.c | 10 -
    fs/nilfs2/the_nilfs.c | 7
    fs/reiserfs/journal.c | 106 ++--------
    fs/xfs/linux-2.6/xfs_buf.c | 16 -
    fs/xfs/linux-2.6/xfs_buf.h | 11 -
    fs/xfs/linux-2.6/xfs_trace.h | 1
    fs/xfs/xfs_log.c | 13 -
    include/linux/blk_types.h | 4
    include/linux/blkdev.h | 85 +-------
    include/linux/buffer_head.h | 2
    include/linux/fs.h | 27 +-
    include/scsi/scsi_tcq.h | 6
    mm/swapfile.c | 9
    59 files changed, 585 insertions(+), 1245 deletions(-)

    Thanks.

    --
    tejun

    [1] http://thread.gmane.org/gmane.linux.kernel/1022363
    [2] http://thread.gmane.org/gmane.linux.raid/29100
    [3] http://thread.gmane.org/gmane.linux.file-systems/44957


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