scrub updates for 3.2

Hi Chris,

I rebased my readahead-patches for scrub to your current integration-test branch (83f4e90fd11) and pushed it to:

[email protected]:sensille/linux.git for-chris

It just contains the readahead patch, which gives a significant performance improvement for scrub. Currently scrub is the only consumer.

Thanks,
Arne

Arne Jansen (7):
btrfs: add an extra wait mode to read_extent_buffer_pages
btrfs: add READAHEAD extent buffer flag
btrfs: state information for readahead
btrfs: initial readahead code and prototypes
btrfs: hooks for readahead
btrfs: test ioctl for readahead
btrfs: use readahead API for scrub

 fs/btrfs/Makefile    |    3 +-
 fs/btrfs/ctree.h     |   21 ++
 fs/btrfs/disk-io.c   |   85 +++++-
 fs/btrfs/disk-io.h   |    2 +
 fs/btrfs/extent_io.c |    9 +-
 fs/btrfs/extent_io.h |    4 +
 fs/btrfs/ioctl.c     |   93 +++++-
 fs/btrfs/ioctl.h     |   16 +
 fs/btrfs/reada.c     |  949 ++++++++++++++++++++++++++++++++++++++++++++++++++
 fs/btrfs/scrub.c     |  116 +++----
 fs/btrfs/volumes.c   |    8 +
 fs/btrfs/volumes.h   |    8 +
 12 files changed, 1239 insertions(+), 75 deletions(-)
 create mode 100644 fs/btrfs/reada.c

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