switch coda get_device_index() to fget_light()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

fs/coda/inode.c

@@ -109,41 +109,39 @@ static int get_device_index(struct coda_mount_data *data)
 {
 	struct file *file;
 	struct inode *inode;
-	int idx;
+	int idx, fput_needed;
 
-	if(data == NULL) {
+	if (data == NULL) {
 		printk("coda_read_super: Bad mount data\n");
 		return -1;
 	}
 
-	if(data->version != CODA_MOUNT_VERSION) {
+	if (data->version != CODA_MOUNT_VERSION) {
 		printk("coda_read_super: Bad mount version\n");
 		return -1;
 	}
 
-	file = fget(data->fd);
-	inode = NULL;
-	if(file)
-		inode = file->f_path.dentry->d_inode;
-	
-	if(!inode || !S_ISCHR(inode->i_mode) ||
-	   imajor(inode) != CODA_PSDEV_MAJOR) {
-		if(file)
-			fput(file);
-
-		printk("coda_read_super: Bad file\n");
-		return -1;
+	file = fget_light(data->fd, &fput_needed);
+	if (!file)
+		goto Ebadf;
+	inode = file->f_path.dentry->d_inode;
+	if (!S_ISCHR(inode->i_mode) || imajor(inode) != CODA_PSDEV_MAJOR) {
+		fput_light(file, fput_needed);
+		goto Ebadf;
 	}
 
 	idx = iminor(inode);
-	fput(file);
+	fput_light(file, fput_needed);
 
-	if(idx < 0 || idx >= MAX_CODADEVS) {
+	if (idx < 0 || idx >= MAX_CODADEVS) {
 		printk("coda_read_super: Bad minor number\n");
 		return -1;
 	}
 
 	return idx;
+Ebadf:
+	printk("coda_read_super: Bad file\n");
+	return -1;
 }
 
 static int coda_fill_super(struct super_block *sb, void *data, int silent)