Merge tag 'afs-fixes-20171124' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs

Pull AFS fixes from David Howells:

 - Make AFS file locking work again.

 - Don't write to a page that's being written out, but wait for it to
   complete.

 - Do d_drop() and d_add() in the right places.

 - Put keys on error paths.

 - Remove some redundant code.

* tag 'afs-fixes-20171124' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs:
  afs: remove redundant assignment of dvnode to itself
  afs: cell: Remove unnecessary code in afs_lookup_cell
  afs: Fix signal handling in some file ops
  afs: Fix some dentry handling in dir ops and missing key_puts
  afs: Make afs_write_begin() avoid writing to a page that's being stored
  afs: Fix file locking

Author: torvalds

fs/afs/cell.c

@@ -207,13 +207,8 @@ struct afs_cell *afs_lookup_cell(struct afs_net *net,
 		rcu_read_lock();
 		cell = afs_lookup_cell_rcu(net, name, namesz);
 		rcu_read_unlock();
-		if (!IS_ERR(cell)) {
-			if (excl) {
-				afs_put_cell(net, cell);
-				return ERR_PTR(-EEXIST);
-			}
+		if (!IS_ERR(cell))
 			goto wait_for_cell;
-		}
 	}
 
 	/* Assume we're probably going to create a cell and preallocate and

fs/afs/dir.c

@@ -765,6 +765,8 @@ static void afs_vnode_new_inode(struct afs_fs_cursor *fc,
 	if (fc->ac.error < 0)
 		return;
 
+	d_drop(new_dentry);
+
 	inode = afs_iget(fc->vnode->vfs_inode.i_sb, fc->key,
 			 newfid, newstatus, newcb, fc->cbi);
 	if (IS_ERR(inode)) {
@@ -775,9 +777,7 @@ static void afs_vnode_new_inode(struct afs_fs_cursor *fc,
 		return;
 	}
 
-	d_instantiate(new_dentry, inode);
-	if (d_unhashed(new_dentry))
-		d_rehash(new_dentry);
+	d_add(new_dentry, inode);
 }
 
 /*
@@ -818,6 +818,8 @@ static int afs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 		ret = afs_end_vnode_operation(&fc);
 		if (ret < 0)
 			goto error_key;
+	} else {
+		goto error_key;
 	}
 
 	key_put(key);
@@ -972,7 +974,7 @@ static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 	struct afs_fs_cursor fc;
 	struct afs_file_status newstatus;
 	struct afs_callback newcb;
-	struct afs_vnode *dvnode = dvnode = AFS_FS_I(dir);
+	struct afs_vnode *dvnode = AFS_FS_I(dir);
 	struct afs_fid newfid;
 	struct key *key;
 	int ret;
@@ -1006,6 +1008,8 @@ static int afs_create(struct inode *dir, struct dentry *dentry, umode_t mode,
 		ret = afs_end_vnode_operation(&fc);
 		if (ret < 0)
 			goto error_key;
+	} else {
+		goto error_key;
 	}
 
 	key_put(key);
@@ -1053,7 +1057,7 @@ static int afs_link(struct dentry *from, struct inode *dir,
 	if (afs_begin_vnode_operation(&fc, dvnode, key)) {
 		if (mutex_lock_interruptible_nested(&vnode->io_lock, 1) < 0) {
 			afs_end_vnode_operation(&fc);
-			return -ERESTARTSYS;
+			goto error_key;
 		}
 
 		while (afs_select_fileserver(&fc)) {
@@ -1071,6 +1075,8 @@ static int afs_link(struct dentry *from, struct inode *dir,
 		ret = afs_end_vnode_operation(&fc);
 		if (ret < 0)
 			goto error_key;
+	} else {
+		goto error_key;
 	}
 
 	key_put(key);
@@ -1130,6 +1136,8 @@ static int afs_symlink(struct inode *dir, struct dentry *dentry,
 		ret = afs_end_vnode_operation(&fc);
 		if (ret < 0)
 			goto error_key;
+	} else {
+		goto error_key;
 	}
 
 	key_put(key);
@@ -1180,7 +1188,7 @@ static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
 		if (orig_dvnode != new_dvnode) {
 			if (mutex_lock_interruptible_nested(&new_dvnode->io_lock, 1) < 0) {
 				afs_end_vnode_operation(&fc);
-				return -ERESTARTSYS;
+				goto error_key;
 			}
 		}
 		while (afs_select_fileserver(&fc)) {
@@ -1199,14 +1207,9 @@ static int afs_rename(struct inode *old_dir, struct dentry *old_dentry,
 			goto error_key;
 	}
 
-	key_put(key);
-	_leave(" = 0");
-	return 0;
-
 error_key:
 	key_put(key);
 error:
-	d_drop(new_dentry);
 	_leave(" = %d", ret);
 	return ret;
 }