From: Sage Weil <sage@newdream.net>
Date: Tue, 24 Aug 2010 15:44:16 +0000 (-0700)
Subject: ceph: maintain i_head_snapc when any caps are dirty, not just for data
X-Git-Tag: v2.6.36-rc3~12^2~6
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7d8cb26d7dcb911f110b7762bd5941e8f009d6c3;p=pandora-kernel.git

ceph: maintain i_head_snapc when any caps are dirty, not just for data

We used to use i_head_snapc to keep track of which snapc the current epoch
of dirty data was dirtied under.  It is used by queue_cap_snap to set up
the cap_snap.  However, since we queue cap snaps for any dirty caps, not
just for dirty file data, we need to keep a valid i_head_snapc anytime
we have dirty|flushing caps.  This fixes a NULL pointer deref in
queue_cap_snap when writing back dirty caps without data (e.g.,
snaptest-authwb.sh).

Signed-off-by: Sage Weil <sage@newdream.net>
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