nfsd4: add a helper function to decide if stateid is delegation

Make this check self-documenting.

Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>

1 files changed, 6 insertions, 1 deletions

diff --git a/fs/nfsd/nfs4state.c b/fs/nfsd/nfs4state.c
index 909a7a493688..d5555850cb64 100644
--- a/fs/nfsd/nfs4state.c
+++ b/fs/nfsd/nfs4state.c
@@ -2048,6 +2048,11 @@ static int check_stateid_generation(stateid_t *in, stateid_t *ref)
         return nfs_ok;
 }
 
+static int is_delegation_stateid(stateid_t *stateid)
+{
+        return stateid->si_fileid == 0;
+}
+
 /*
 * Checks for stateid operations
 */
@@ -2073,7 +2078,7 @@ nfs4_preprocess_stateid_op(struct svc_fh *current_fh, stateid_t *stateid, int fl
                 goto out;
 
         status = nfserr_bad_stateid;
-        if (!stateid->si_fileid) { /* delegation stateid */
+        if (is_delegation_stateid(stateid)) {
                 dp = find_delegation_stateid(ino, stateid);
                 if (!dp)
                         goto out;