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[XFS updates] XFS development tree branch, master, updated. v2.6.38-1013

To: xfs@xxxxxxxxxxx
Subject: [XFS updates] XFS development tree branch, master, updated. v2.6.38-10136-g55a7bc5
From: xfs@xxxxxxxxxxx
Date: Tue, 24 May 2011 20:38:34 -0500
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The branch, master has been updated
  55a7bc5 xfs: do not discard alloc btree blocks
  e84661a xfs: add online discard support
      from  bf59170a66bc3eaf3ee513aa6ce9774aa2ab5188 (commit)

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- Log -----------------------------------------------------------------
commit 55a7bc5a30ff2d30d8a34fea2af9fc601b32e61a
Author: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date:   Wed May 4 18:55:15 2011 +0000

    xfs: do not discard alloc btree blocks
    
    Blocks for the allocation btree are allocated from and released to
    the AGFL, and thus frequently reused.  Even worse we do not have an
    easy way to avoid using an AGFL block when it is discarded due to
    the simple FILO list of free blocks, and thus can frequently stall
    on blocks that are currently undergoing a discard.
    
    Add a flag to the busy extent tracking structure to skip the discard
    for allocation btree blocks.  In normal operation these blocks are
    reused frequently enough that there is no need to discard them
    anyway, but if they spill over to the allocation btree as part of a
    balance we "leak" blocks that we would otherwise discard.  We could
    fix this by adding another flag and keeping these block in the
    rbtree even after they aren't busy any more so that we could discard
    them when they migrate out of the AGFL.  Given that this would cause
    significant overhead I don't think it's worthwile for now.
    
    Signed-off-by: Christoph Hellwig <hch@xxxxxx>
    Signed-off-by: Alex Elder <aelder@xxxxxxx>

commit e84661aa84e2e003738563f65155d4f12dc474e7
Author: Christoph Hellwig <hch@xxxxxxxxxxxxx>
Date:   Fri May 20 13:45:32 2011 +0000

    xfs: add online discard support
    
    Now that we have reliably tracking of deleted extents in a
    transaction we can easily implement "online" discard support
    which calls blkdev_issue_discard once a transaction commits.
    
    The actual discard is a two stage operation as we first have
    to mark the busy extent as not available for reuse before we
    can start the actual discard.  Note that we don't bother
    supporting discard for the non-delaylog mode.
    
    Signed-off-by: Christoph Hellwig <hch@xxxxxx>
    Signed-off-by: Alex Elder <aelder@xxxxxxx>

-----------------------------------------------------------------------

Summary of changes:
 fs/xfs/linux-2.6/xfs_discard.c |   29 +++++++++++++++++++++++++++++
 fs/xfs/linux-2.6/xfs_discard.h |    2 ++
 fs/xfs/linux-2.6/xfs_super.c   |   18 ++++++++++++++++--
 fs/xfs/xfs_ag.h                |    3 +++
 fs/xfs/xfs_alloc.c             |   35 ++++++++++++++++++++++++++++++-----
 fs/xfs/xfs_alloc.h             |    5 +++--
 fs/xfs/xfs_alloc_btree.c       |    3 ++-
 fs/xfs/xfs_log_cil.c           |   13 ++++++++++++-
 fs/xfs/xfs_mount.h             |    1 +
 fs/xfs/xfs_trans.c             |    2 +-
 10 files changed, 99 insertions(+), 12 deletions(-)


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