nfsd: Add fine grained protection for the nfs4_file->fi_stateids list

Access to this list is currently serialized by the client_mutex. Add
finer grained locking around this list in preparation for its removal.

Signed-off-by: Trond Myklebust <trond.myklebust@primarydata.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/fs/nfsd/state.h b/fs/nfsd/state.h
index 06d1a908a58e..04737b3ed363 100644
--- a/fs/nfsd/state.h
+++ b/fs/nfsd/state.h
@@ -377,6 +377,7 @@ static inline struct nfs4_lockowner * lockowner(struct nfs4_stateowner *so)
 /* nfs4_file: a file opened by some number of (open) nfs4_stateowners. */
 struct nfs4_file {
         atomic_t                fi_ref;
+        spinlock_t              fi_lock;
         struct hlist_node       fi_hash;    /* hash by "struct inode *" */
         struct list_head        fi_stateids;
         struct list_head        fi_delegations;