From: Mike Snitzer <snitzer@redhat.com>
Date: Thu, 5 Dec 2013 21:03:33 +0000 (-0500)
Subject: dm thin: cleanup and improve no space handling
X-Git-Tag: v3.14-rc1~130^2~22
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=399caddfb16f5fa30c66056a32477cf95c947e2b;p=pandora-kernel.git

dm thin: cleanup and improve no space handling

Factor out_of_data_space() out of alloc_data_block().  Eliminate the use
of 'no_free_space' as a latch in alloc_data_block() -- this is no longer
needed now that we switch to read-only mode when we run out of data or
metadata space.  In a later patch, the 'no_free_space' flag will be
eliminated entirely (in favor of checking metadata rather than relying
on a transient flag).

Move no metdata space handling into metdata_operation_failed().  Set
no_free_space when metadata space is exhausted too.  This is useful,
because it offers consistency, for the following patch that will requeue
data IOs if no_free_space.

Also, rename no_space() to retry_bios_on_resume().

Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Acked-by: Joe Thornber <ejt@redhat.com>
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