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| /openbmc/linux/fs/nfsd/ |
| H A D | nfs4state.c | 356a95ec Tue Jul 29 20:34:13 CDT 2014 Jeff Layton <jlayton@primarydata.com> nfsd: clean up races in lock stateid searching and creation
Preparation for removal of the client_mutex.
Currently, no lock aside from the client_mutex is held when calling
find_lock_state. Ensure that the cl_lock is held by adding a lockdep
assertion.
Once we remove the client_mutex, it'll be possible for another thread to
race in and insert a lock state for the same file after we search but
before we insert a new one. Ensure that doesn't happen by redoing the
search after allocating a new stid that we plan to insert. If one is
found just put the one that was allocated.
Signed-off-by: Jeff Layton <jlayton@primarydata.com>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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