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authorStanislav Kinsbursky <skinsbursky@parallels.com>2012-11-21 18:07:38 +0300
committerJ. Bruce Fields <bfields@redhat.com>2012-11-28 10:13:49 -0500
commitec28e02ca5f2a4287c19c585f8be2d9b3ba123ea (patch)
tree3813dba8716d0d7ab285c82f51c98599662d3f1b
parentdba88ba55a06ff8bef467f2ca3f7904aeab8762a (diff)
nfsd4: remove state lock from nfs4_state_shutdown
Protection of __nfs4_state_shutdown() with nfs4_lock_state() looks redundant. This function is called by the last NFSd thread on it's exit and state lock protects actually two functions (del_recall_lru is protected by recall_lock): 1) nfsd4_client_tracking_exit 2) __nfs4_state_shutdown_net "nfsd4_client_tracking_exit" doesn't require state lock protection, because it's state can be modified only by tracker callbacks. Here a re they: 1) create: is called only from nfsd4_proc_compound. 2) remove: is called from either nfsd4_proc_compound or nfs4_laundromat. 3) check: is called only from nfsd4_proc_compound. 4) grace_done; called only from nfs4_laundromat. nfsd4_proc_compound is called onll by NFSd kthread, which is exiting right now. nfs4_laundromat is called by laundry_wq. But laundromat_work was canceled already. "__nfs4_state_shutdown_net" also doesn't require state lock protection, because all NFSd kthreads are dead, and no race can happen with NFSd start, because "nfsd_up" flag is still set. Moreover, all Nfsd shutdown is protected with global nfsd_mutex. Signed-off-by: Stanislav Kinsbursky <skinsbursky@parallels.com> Signed-off-by: J. Bruce Fields <bfields@redhat.com>
-rw-r--r--fs/nfsd/nfs4state.c2
1 files changed, 0 insertions, 2 deletions
diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 41d2aed8ed06..ffec73cdfaca 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -4930,9 +4930,7 @@ nfs4_state_shutdown(void)
cancel_delayed_work_sync(&nn->laundromat_work);
destroy_workqueue(laundry_wq);
locks_end_grace(&nn->nfsd4_manager);
- nfs4_lock_state();
__nfs4_state_shutdown(net);
- nfs4_unlock_state();
nfsd4_destroy_callback_queue();
}