[PATCH 0/6] [XFS] introduce a AG inode tree walker

[Dave Chinner <david@xxxxxxxxxxxxx>]

This series splits up the sync and reclaim code into three
separate actions. The first is the tree walker, the second is
the inode validation and the third is the operation to execute
on the inode.

This allows us to somewhat abstract the radix tree away from the
act of walking the cached inodes and puts in place mechanisms that
can be extended for bulk inode cache lookups.

This also splits the inode writeback into separate data and metadata
sync operations and optimises them a little......