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[RFC PATCH 0/4] clean up collapse range and handle post-eof delalloc

To: xfs@xxxxxxxxxxx
Subject: [RFC PATCH 0/4] clean up collapse range and handle post-eof delalloc
From: Brian Foster <bfoster@xxxxxxxxxx>
Date: Fri, 29 Aug 2014 16:29:34 -0400
Delivered-to: xfs@xxxxxxxxxxx
Here's a drop of what I'm testing over the weekend. It passes some quick
tests, but only lightly tested so far.

My biggest question at this point is whether there is any risk to the
shift of the post-eof extent if the subsequent truncate happens to fail.
If it's not worth dealing with that, we could just drop patch 3 and
leave the eofblocks trim permanently.

In fact, it might even be a good idea to go back to the original
[start,-1] writeback in collapse range given that the free file space
helper could change at some point to only write and punch out the range
being freed... and then we're left shifting a bunch of extents after the
freed range that could have dirty data in pagecache, which sounds bad.


Brian Foster (4):
  xfs: track collapse via file offset rather than extent index
  xfs: refactor xfs_bmap_shift_extents() into multiple functions
  xfs: allow collapse to handle delalloc extents
  xfs: remove file writeback and eofblocks trim from collapse range

 fs/xfs/libxfs/xfs_bmap.c | 302 ++++++++++++++++++++++++++++++++---------------
 fs/xfs/libxfs/xfs_bmap.h |   7 +-
 fs/xfs/xfs_bmap_util.c   |  32 +----
 3 files changed, 214 insertions(+), 127 deletions(-)


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