[PATCH] nfsd4: rename lk_stateowner

One of the things that's confusing about nfsd4_lock is that the lk_stateowner
field could be set to either of two different lockowners: the open owner or
the lock owner.  Rename to lk_replay_owner and add a comment to make it clear
that it's used for whichever stateowner has its sequence id bumped for replay
detection.
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

fs/nfsd/nfs4state.c

@@ -2725,11 +2725,11 @@ nfsd4_lock(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock
 				        lock->lk_new_open_seqid,
 		                        &lock->lk_new_open_stateid,
 		                        CHECK_FH | OPEN_STATE,
-		                        &lock->lk_stateowner, &open_stp,
+		                        &lock->lk_replay_owner, &open_stp,
 					lock);
 		if (status)
 			goto out;
-		open_sop = lock->lk_stateowner;
+		open_sop = lock->lk_replay_owner;
 		/* create lockowner and lock stateid */
 		fp = open_stp->st_file;
 		strhashval = lock_ownerstr_hashval(fp->fi_inode, 
@@ -2752,12 +2752,12 @@ nfsd4_lock(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock
 				       lock->lk_old_lock_seqid, 
 				       &lock->lk_old_lock_stateid, 
 				       CHECK_FH | LOCK_STATE, 
-				       &lock->lk_stateowner, &lock_stp, lock);
+				       &lock->lk_replay_owner, &lock_stp, lock);
 		if (status)
 			goto out;
-		lock_sop = lock->lk_stateowner;
+		lock_sop = lock->lk_replay_owner;
 	}
-	/* lock->lk_stateowner and lock_stp have been created or found */
+	/* lock->lk_replay_owner and lock_stp have been created or found */
 	filp = lock_stp->st_vfs_file;
 
 	status = nfserr_grace;
@@ -2830,9 +2830,9 @@ nfsd4_lock(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock
 out:
 	if (status && lock->lk_is_new && lock_sop)
 		release_stateowner(lock_sop);
-	if (lock->lk_stateowner) {
-		nfs4_get_stateowner(lock->lk_stateowner);
-		*replay_owner = lock->lk_stateowner;
+	if (lock->lk_replay_owner) {
+		nfs4_get_stateowner(lock->lk_replay_owner);
+		*replay_owner = lock->lk_replay_owner;
 	}
 	nfs4_unlock_state();
 	return status;

fs/nfsd/nfs4xdr.c

@@ -528,7 +528,7 @@ nfsd4_decode_lock(struct nfsd4_compoundargs *argp, struct nfsd4_lock *lock)
 {
 	DECODE_HEAD;
 
-	lock->lk_stateowner = NULL;
+	lock->lk_replay_owner = NULL;
 	/*
 	* type, reclaim(boolean), offset, length, new_lock_owner(boolean)
 	*/
@@ -1895,7 +1895,6 @@ nfsd4_encode_lock_denied(struct nfsd4_compoundres *resp, struct nfsd4_lock_denie
 static void
 nfsd4_encode_lock(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_lock *lock)
 {
-
 	ENCODE_SEQID_OP_HEAD;
 
 	if (!nfserr) {
@@ -1906,7 +1905,7 @@ nfsd4_encode_lock(struct nfsd4_compoundres *resp, int nfserr, struct nfsd4_lock
 	} else if (nfserr == nfserr_denied)
 		nfsd4_encode_lock_denied(resp, &lock->lk_denied);
 
-	ENCODE_SEQID_OP_TAIL(lock->lk_stateowner);
+	ENCODE_SEQID_OP_TAIL(lock->lk_replay_owner);
 }
 
 static void

include/linux/nfsd/xdr4.h

@@ -145,8 +145,9 @@ struct nfsd4_lock {
 		} ok;
 		struct nfsd4_lock_denied        denied;
 	} u;
-
-	struct nfs4_stateowner *lk_stateowner;
+	/* The lk_replay_owner is the open owner in the open_to_lock_owner
+	 * case and the lock owner otherwise: */
+	struct nfs4_stateowner *lk_replay_owner;
 };
 #define lk_new_open_seqid       v.new.open_seqid
 #define lk_new_open_stateid     v.new.open_stateid