Merge branch 'for-3.10/drivers' of git://git.kernel.dk/linux-block

Pull block driver updates from Jens Axboe:
 "It might look big in volume, but when categorized, not a lot of
  drivers are touched.  The pull request contains:

   - mtip32xx fixes from Micron.

   - A slew of drbd updates, this time in a nicer series.

   - bcache, a flash/ssd caching framework from Kent.

   - Fixes for cciss"

* 'for-3.10/drivers' of git://git.kernel.dk/linux-block: (66 commits)
  bcache: Use bd_link_disk_holder()
  bcache: Allocator cleanup/fixes
  cciss: bug fix to prevent cciss from loading in kdump crash kernel
  cciss: add cciss_allow_hpsa module parameter
  drivers/block/mg_disk.c: add CONFIG_PM_SLEEP to suspend/resume functions
  mtip32xx: Workaround for unaligned writes
  bcache: Make sure blocksize isn't smaller than device blocksize
  bcache: Fix merge_bvec_fn usage for when it modifies the bvm
  bcache: Correctly check against BIO_MAX_PAGES
  bcache: Hack around stuff that clones up to bi_max_vecs
  bcache: Set ra_pages based on backing device's ra_pages
  bcache: Take data offset from the bdev superblock.
  mtip32xx: mtip32xx: Disable TRIM support
  mtip32xx: fix a smatch warning
  bcache: Disable broken btree fuzz tester
  bcache: Fix a format string overflow
  bcache: Fix a minor memory leak on device teardown
  bcache: Documentation updates
  bcache: Use WARN_ONCE() instead of __WARN()
  bcache: Add missing #include <linux/prefetch.h>
  ...

62 files changed, 17681 insertions, 372 deletions

diff --git a/Documentation/ABI/testing/sysfs-block-bcache b/Documentation/ABI/testing/sysfs-block-bcache
new file mode 100644
index 000000000000..9e4bbc5d51fd
--- /dev/null
+++ b/Documentation/ABI/testing/sysfs-block-bcache
@@ -0,0 +1,156 @@
+What:           /sys/block/<disk>/bcache/unregister
+Date:           November 2010
+Contact:        Kent Overstreet <kent.overstreet@gmail.com>
+Description:
+                A write to this file causes the backing device or cache to be
+                unregistered. If a backing device had dirty data in the cache,
+                writeback mode is automatically disabled and all dirty data is
+                flushed before the device is unregistered. Caches unregister
+                all associated backing devices before unregistering themselves.
+
+What:           /sys/block/<disk>/bcache/clear_stats
+Date:           November 2010
+Contact:        Kent Overstreet <kent.overstreet@gmail.com>
+Description:
+                Writing to this file resets all the statistics for the device.
+
+What:           /sys/block/<disk>/bcache/cache
+Date:           November 2010
+Contact:        Kent Overstreet <kent.overstreet@gmail.com>
+Description:
+                For a backing device that has cache, a symlink to
+                the bcache/ dir of that cache.
+
+What:           /sys/block/<disk>/bcache/cache_hits
+Date:           November 2010
+Contact:        Kent Overstreet <kent.overstreet@gmail.com>
+Description:
+                For backing devices: integer number of full cache hits,
+                counted per bio. A partial cache hit counts as a miss.
+
+What:           /sys/block/<disk>/bcache/cache_misses
+Date:           November 2010
+Contact:        Kent Overstreet <kent.overstreet@gmail.com>
+Description:
+                For backing devices: integer number of cache misses.
+
+What:           /sys/block/<disk>/bcache/cache_hit_ratio
+Date:           November 2010
+Contact:        Kent Overstreet <kent.overstreet@gmail.com>
+Description:
+                For backing devices: cache hits as a percentage.
+
+What:           /sys/block/<disk>/bcache/sequential_cutoff
+Date:           November 2010
+Contact:        Kent Overstreet <kent.overstreet@gmail.com>
+Description:
+                For backing devices: Threshold past which sequential IO will
+                skip the cache. Read and written as bytes in human readable
+                units (i.e. echo 10M > sequntial_cutoff).
+
+What:           /sys/block/<disk>/bcache/bypassed
+Date:           November 2010
+Contact:        Kent Overstreet <kent.overstreet@gmail.com>
+Description:
+                Sum of all reads and writes that have bypassed the cache (due
+                to the sequential cutoff).  Expressed as bytes in human
+                readable units.
+
+What:           /sys/block/<disk>/bcache/writeback
+Date:           November 2010
+Contact:        Kent Overstreet <kent.overstreet@gmail.com>
+Description:
+                For backing devices: When on, writeback caching is enabled and
+                writes will be buffered in the cache. When off, caching is in
+                writethrough mode; reads and writes will be added to the
+                cache but no write buffering will take place.
+
+What:           /sys/block/<disk>/bcache/writeback_running
+Date:           November 2010
+Contact:        Kent Overstreet <kent.overstreet@gmail.com>
+Description:
+                For backing devices: when off, dirty data will not be written
+                from the cache to the backing device. The cache will still be
+                used to buffer writes until it is mostly full, at which point
+                writes transparently revert to writethrough mode. Intended only
+                for benchmarking/testing.
+
+What:           /sys/block/<disk>/bcache/writeback_delay
+Date:           November 2010
+Contact:        Kent Overstreet <kent.overstreet@gmail.com>
+Description:
+                For backing devices: In writeback mode, when dirty data is
+                written to the cache and the cache held no dirty data for that