drbd: a block device for HA clusters

Hi,

As the first bit of the DBRD patch already got upstream (see commit
10fc89d01a) it is time to get more of DRBD towards mainline.

Please consider the lru_cache as next building block of DRBD for inclusion.

Patch set attached. Git tree available:
git pull git://git.drbd.org/linux-2.6-drbd.git drbd

We are looking for reviews!

Note for reviewers:

  Only the first patch (lru_cache) is self contained. The other patches are
  just split at file boundaries. Sorry, DRBD was developed as out-of-tree
  modules just for too long.

Short Description

  DRBD is a shared-nothing, synchronously replicated block device. It is
  designed to serve as a building block for high availability clusters and

  in this context, is a "drop-in" replacement for shared storage.
  Simplistically, you could see it as a network RAID 1.

  More information can be found at http://www.drbd.org

Changes since 2009-05-15

  * Cleanup: Moved lru_cache.c to /lib
  * Cleanup: all STATIC -> static
  * Cleanup: Removed drbd_config.h ; New Kconfig option: CONFIG_DRBD_FAULT_INJECTION
  * Cleanup: Removed drbd_buildtag.c
  * DRBD:    Following DRBD-upstream, now at 8.3.2-rc2. Relevant changes:
  * DRBD:    lru_cache: use pointer arrays and kmem_cache
  * DRBD:    Fixed for building on big endian architectures
  * DRBD:    Fixed nl stuff to work on architectures that does not do unaligned memory accesses
  * DRBD:    Deal with hash functions already ported to SHASH
  * DRBD:    GFP_KERNEL -> GFP_NOIO in various places

Changes since 2009-04-30

  * Cleanup: Removed typecasts, more documentation in lru_cache. Moved to /lib
  * Cleanup: replaced __attribute__((packed)) with __packed
  * Cleanup: remove quite a few 'inline's from .c files
  * Cleanup: renaming a few constants: _SECT -> _SECTOR_SIZE, _SIZE_B -> _SHIFT ...
  * Cleanup: rename inc_local -> get_ldev; inc_net -> get_net_conf; and corresponding dec_* -> put_*
  * Cleanup: rename mdev->bc to mdev->ldev (to match the recent change to get_ldev/put_ldev)
  * Cleanup: Made function comments kernel-doc compliant
  * Cleanup: vmalloc() only as a fall back for kmalloc()
  * DRBD:    Allow detach of a SyncTarget node. (Bugz 221)
  * DRBD:    Call drbd_rs_cancel_all() and reset rs_pending when aborting resync due to detach. (Bugz 223)
  * DRBD:    make drbd thread t_lock irqsave - lockdep complained, and lockdep is right (theoretically)

Changes since 2009-04-10

  * Cleanup: Removed all CamelCase
  * Cleanup: Replaced DRBD's own tracing stuff with regular tracepoints
  * Cleanup: Removed ERR/INFO/ALERT ... macros, using dev_err/dev_info/... now
  * Cleanup: Minor stuff, as suggested in feedback on LKML
  * DRBD:    Bitmap compression feature was finalised
  * DRBD:    new disable_sendpage parameter

Changes since the post on 2009-03-30, all triggered by reviews

  * Improvements to Makefile and Kconfig
  * Simplified definitions of bm_flags' bitnumbers
  * Removed debugging aid

Changes since the post on 2009-03-23, from drbd-mainline

  * Updated to the final drbd-8.3.1 code
  * Optionally run-length encode bitmap transfers

Changes since the post on 2009-03-23, triggered by reviews

  * Using the latest proc_create() now
  * Moved the allocation of md_io_tmpp to attach/detach out of drbd_md_sync_page_io()
  * Removing the mode selection comments for emacs
  * Removed DRBD_ratelimit()

cheers,
  Phil
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