From: Alex Elder <elder@inktank.com>
Date: Thu, 17 Jan 2013 18:25:27 +0000 (-0600)
Subject: rbd: implement sync object read with new code
X-Git-Tag: v3.9-rc1~41^2~21^2~44
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=788e2df3b92e30f1fff74139bb53e68ec13fe2a5;p=pandora-kernel.git

rbd: implement sync object read with new code

Reimplement the synchronous read operation used for reading a
version 1 header using the new request tracking code.  Name the
resulting function rbd_obj_read_sync() to better reflect that
it's a full object operation, not an object request.  To do this,
implement a new OBJ_REQUEST_PAGES object request type.

This implements a new mechanism to allow the caller to wait for
completion for an rbd_obj_request by calling rbd_obj_request_wait().

This partially resolves:
    http://tracker.newdream.net/issues/3755

Signed-off-by: Alex Elder <elder@inktank.com>
Reviewed-by: Josh Durgin <josh.durgin@inktank.com>
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