[PATCH 0/7] rbd: use common code for probe and refresh

[Alex Elder <elder@inktank.com>]

This is some work I had nearly done a long time ago.  It didn't even
have a bug associated with it.  I resurrected it over the weekend
and ported it to the new code.

It's basically cleanup though.  For format 1 rbd images, when
probing an image, header information for it is read in and
translated directly into the rbd_dev->header structure.

For an image refresh, instead, we use a stack structure to
hold the translated header, and then in a second step we
copy that into rbd_dev->header.

This series gets rid of the local variable, and always just
puts things directly into rbd_dev->header.  It also simplifies
probe and refresh for both format 1 and format 2, using a
common rbd_dev_vX_header_info() function for both purposes.

This set of patches, as well as the two single patches
and series of six I just posted, are available in the
"review/wip-rbd-cleanup-1" branch of the ceph-client git
repository.

					-Alex

[PATCH 1/7] rbd: set the mapping size and features later
[PATCH 2/7] rbd: zero format 1 header structure earlier
[PATCH 3/7] rbd: refactor rbd_header_from_disk()
[PATCH 4/7] rbd: update in-core header directly
[PATCH 5/7] rbd: simplify rbd_dev_v1_probe()
[PATCH 6/7] rbd: get rid of trivial v1 header wrappers
[PATCH 7/7] rbd: define rbd_dev_v1_header_info()