[PATCH] nfsd4: fix open seqid incrementing in lock

In the case of a lock which introduces a new lockowner, the openowner's
sequence id should be incremented, even when the operation fails, if the
error is a sequence-id-mutating error.  The current code fails to do that
in some cases.  Fix this by using the same sequence-id-incrementing
mechanism that all other such operations use.
Signed-off-by: NJ. Bruce Fields <bfields@citi.umich.edu>
Signed-off-by: NNeil Brown <neilb@suse.de>
Signed-off-by: NAndrew Morton <akpm@osdl.org>
Signed-off-by: NLinus Torvalds <torvalds@osdl.org>

fs/nfsd/nfs4state.c

@@ -2629,7 +2629,9 @@ alloc_init_lock_stateowner(unsigned int strhashval, struct nfs4_client *clp, str
 	sop->so_is_open_owner = 0;
 	sop->so_id = current_ownerid++;
 	sop->so_client = clp;
-	sop->so_seqid = lock->lk_new_lock_seqid;
+	/* It is the openowner seqid that will be incremented in encode in the
+	 * case of new lockowners; so increment the lock seqid manually: */
+	sop->so_seqid = lock->lk_new_lock_seqid + 1;
 	sop->so_confirmed = 1;
 	rp = &sop->so_replay;
 	rp->rp_status = NFSERR_SERVERFAULT;
@@ -2684,6 +2686,7 @@ int
 nfsd4_lock(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock *lock, struct nfs4_stateowner **replay_owner)
 {
 	struct nfs4_stateowner *open_sop = NULL;
+	struct nfs4_stateowner *lock_sop = NULL;
 	struct nfs4_stateid *lock_stp;
 	struct file *filp;
 	struct file_lock file_lock;
@@ -2718,9 +2721,11 @@ 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,
-		                        &open_sop, &open_stp, lock);
+		                        &lock->lk_stateowner, &open_stp,
+					lock);
 		if (status)
 			goto out;
+		open_sop = lock->lk_stateowner;
 		/* create lockowner and lock stateid */
 		fp = open_stp->st_file;
 		strhashval = lock_ownerstr_hashval(fp->fi_inode, 
@@ -2730,16 +2735,15 @@ nfsd4_lock(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock
 		 * the same file, or should they just be allowed (and
 		 * create new stateids)? */
 		status = nfserr_resource;
-		if (!(lock->lk_stateowner = alloc_init_lock_stateowner(strhashval, open_sop->so_client, open_stp, lock)))
+		lock_sop = alloc_init_lock_stateowner(strhashval,
+				open_sop->so_client, open_stp, lock);
+		if (lock_sop == NULL)
 			goto out;
-		if ((lock_stp = alloc_init_lock_stateid(lock->lk_stateowner, 
-						fp, open_stp)) == NULL) {
-			release_stateowner(lock->lk_stateowner);
-			lock->lk_stateowner = NULL;
+		lock_stp = alloc_init_lock_stateid(lock_sop, fp, open_stp);
+		if (lock_stp == NULL) {
+			release_stateowner(lock_sop);
 			goto out;
 		}
-		/* bump the open seqid used to create the lock */
-		open_sop->so_seqid++;
 	} else {
 		/* lock (lock owner + lock stateid) already exists */
 		status = nfs4_preprocess_seqid_op(current_fh,
@@ -2749,6 +2753,7 @@ nfsd4_lock(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock
 				       &lock->lk_stateowner, &lock_stp, lock);
 		if (status)
 			goto out;
+		lock_sop = lock->lk_stateowner;
 	}
 	/* lock->lk_stateowner and lock_stp have been created or found */
 	filp = lock_stp->st_vfs_file;
@@ -2779,7 +2784,7 @@ nfsd4_lock(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock
 			status = nfserr_inval;
 		goto out;
 	}
-	file_lock.fl_owner = (fl_owner_t) lock->lk_stateowner;
+	file_lock.fl_owner = (fl_owner_t)lock_sop;
 	file_lock.fl_pid = current->tgid;
 	file_lock.fl_file = filp;
 	file_lock.fl_flags = FL_POSIX;
@@ -2835,9 +2840,6 @@ nfsd4_lock(struct svc_rqst *rqstp, struct svc_fh *current_fh, struct nfsd4_lock
 		 * An error encountered after instantiation of the new
 		 * stateid has forced us to destroy it.
 		 */
-		if (!seqid_mutating_err(status))
-			open_sop->so_seqid--;
-
 		release_state_owner(lock_stp, LOCK_STATE);
 	}
 out: