tree 2adf2f6303cc96ff14c951dc6966f68a0fc3cf25
parent 07a27e226d1ed210d2d4218bd0642b40f5405c6a
author Sage Weil <sage@newdream.net> 1282664656 -0700
committer Sage Weil <sage@newdream.net> 1282692258 -0700

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>