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author	Sage Weil <sage.weil@dreamhost.com>
	Wed, 23 Feb 2011 22:25:06 +0000 (14:25 -0800)
committer	Sage Weil <sage.weil@dreamhost.com>
	Thu, 24 Feb 2011 15:35:21 +0000 (07:35 -0800)
commit	3e691d3181f4e897b456f8bae08ec6d3d346fe3a
tree	565d6fba9f28e9b2280a900be3bfde6ce6a0640e	tree \| snapshot
parent	c78b29a47d7211a4b8b1585112ac22b8435a82c7	commit \| diff

mds: fix export cancellation vs nested freezes

Prevent freezes from completing while we are canceling exports. Otherwise
if we are freezing /a/b and /a, and cancel /a/b, we may inadvertantly
complete the freeze on /a (synchronously) and confuse ourselves. Pin
all freezes beforehand so that when we cancel each one we do not cause
any others to prematurely complete.

Signed-off-by: Sage Weil <sage.weil@dreamhost.com>

src/mds/Migrator.cc

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