tree 421b041c32cd218720bc1369b0abe1ce353d4547
parent d1b87809fba3e07a261080837d1ae58d790b51a6
author Yan, Zheng <zheng.z.yan@intel.com> 1385099445 +0800
committer Yan, Zheng <zheng.z.yan@intel.com> 1390282172 +0800

ceph: fix cache revoke race

handle following sequence of events:

- non-auth MDS revokes Fc cap. queue invalidate work
- auth MDS issues Fc cap through request reply. i_rdcache_gen gets
  increased.
- invalidate work runs. it finds i_rdcache_revoking != i_rdcache_gen,
  so it does nothing.

Signed-off-by: Yan, Zheng <zheng.z.yan@intel.com>