[PATCH 00/12] rbd: cleanup series

[Alex Elder <elder@inktank.com>]

This series includes a bunch of relatively small cleanups.
They're grouped a bit below, but they apply together in
this sequence and the later ones may have dependencies on
those earlier in the series.

Summaries:
[PATCH 01/12] rbd: drop extra header_rwsem init
[PATCH 02/12] rbd: simplify __rbd_remove_all_snaps()
[PATCH 03/12] rbd: clean up a few dout() calls
[PATCH 04/12] ceph: define snap counts as u32 everywhere
    These four are very simple and straightforward cleanups.

[PATCH 05/12] rbd: snapc is unused in rbd_req_sync_read()
[PATCH 06/12] rbd: drop rbd_header_from_disk() gfp_flags parameter
[PATCH 07/12] rbd: drop rbd_dev parameter in snap functions
[PATCH 08/12] rbd: drop rbd_req_sync_exec() "ver" parameter
    These four each drop an unused argument from a function.

[PATCH 09/12] rbd: have __rbd_add_snap_dev() return a pointer
[PATCH 10/12] rbd: make rbd_create_rw_ops() return a pointer
    These two each change a function so it returns a pointer
    rather than filling in the address of a provided pointer.

[PATCH 11/12] rbd: always pass ops array to rbd_req_sync_op()
[PATCH 12/12] rbd: fixes in rbd_header_from_disk()
    These comprise slightly more involved refactoring of the
    code, but as with the rest of the patches in this series,
    there should be no functional difference as a result.

					-Alex