[Btrfs-devel] performance fixes pushed out

[Chris Mason]

Hello everyone,

While working on enospc, I hit some low hanging performance fixes in the
allocator.  For inserts into the extent tree, the allocator has to
search for a worst case group of available blocks.  The fix I pushed out
caches that search for reuse later.

Also, I added some btree readahead for the snapshot dropping code.

You can pull the latest from:

http://oss.oracle.com/mercurial/mason/btrfs

-chris