Sage Weil ec4318bcb4 ceph: fix snap rebuild condition
We were rebuilding the snap context when it was not necessary
(i.e. when the realm seq hadn't changed _and_ the parent seq
was still older), which caused page snapc pointers to not match
the realm's snapc pointer (even though the snap context itself
was identical).  This confused begin_write and put it into an
endless loop.

The correct logic is: rebuild snapc if _my_ realm seq changed, or
if my parent realm's seq is newer than mine (and thus mine needs
to be rebuilt too).

Signed-off-by: Sage Weil <sage@newdream.net>
2010-03-23 07:47:02 -07:00
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