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authorFred Isaman <iisaman@netapp.com>2011-02-03 18:28:52 +0000
committerTrond Myklebust <Trond.Myklebust@netapp.com>2011-03-11 15:38:40 -0500
commitf49f9baac8f63de9cbc17a0a84e04060496e8e76 (patch)
treee3e544247ec5e85c47915d34737f278772d15c73 /net/sunrpc/sched.c
parent9f52c2525e09854ed6aa4cbd83915a56226d86c1 (diff)
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pnfs: fix pnfs lock inversion of i_lock and cl_lock
The pnfs code was using throughout the lock order i_lock, cl_lock. This conflicts with the nfs delegation code. Rework the pnfs code to avoid taking both locks simultaneously. Currently the code takes the double lock to add/remove the layout to a nfs_client list, while atomically checking that the list of lsegs is empty. To avoid this, we rely on existing serializations. When a layout is initialized with lseg count equal zero, LAYOUTGET's openstateid serialization is in effect, making it safe to assume it stays zero unless we change it. And once a layout's lseg count drops to zero, it is set as DESTROYED and so will stay at zero. Signed-off-by: Fred Isaman <iisaman@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'net/sunrpc/sched.c')
0 files changed, 0 insertions, 0 deletions
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