RFC: buffer cache backing page allocation cleanup

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Hi all,

while reviewing the patch from Dave to use alloc_pages_bulk_array I
stumbled over all kinds of lose end in the buffer cache, and I started
cleaning them up while procrastinating and avoiding more urgent work,
and rebased the alloc_pages_bulk_array patch on top.

Only run through a quick group xfstests run on a 4k file system so far.

Diffstat:
 libxfs/xfs_ag.c |    1 
 xfs_buf.c       |  256 +++++++++++++++++++++-----------------------------------
 xfs_buf.h       |    3 
 3 files changed, 99 insertions(+), 161 deletions(-)



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