xattr: switch to CLASS(fd)

Reviewed-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

Author: Al Viro

fs/xattr.c

@@ -697,9 +697,9 @@ SYSCALL_DEFINE5(fsetxattr, int, fd, const char __user *, name,
 	int error;
 
 	CLASS(fd, f)(fd);
-	if (!fd_file(f))
-		return -EBADF;
 
+	if (fd_empty(f))
+		return -EBADF;
 	audit_file(fd_file(f));
 	error = setxattr_copy(name, &ctx);
 	if (error)
@@ -809,16 +809,13 @@ SYSCALL_DEFINE4(lgetxattr, const char __user *, pathname,
 SYSCALL_DEFINE4(fgetxattr, int, fd, const char __user *, name,
 		void __user *, value, size_t, size)
 {
-	struct fd f = fdget(fd);
-	ssize_t error = -EBADF;
+	CLASS(fd, f)(fd);
 
-	if (!fd_file(f))
-		return error;
+	if (fd_empty(f))
+		return -EBADF;
 	audit_file(fd_file(f));
-	error = getxattr(file_mnt_idmap(fd_file(f)), fd_file(f)->f_path.dentry,
+	return getxattr(file_mnt_idmap(fd_file(f)), fd_file(f)->f_path.dentry,
 			 name, value, size);
-	fdput(f);
-	return error;
 }
 
 /*
@@ -885,15 +882,12 @@ SYSCALL_DEFINE3(llistxattr, const char __user *, pathname, char __user *, list,
 
 SYSCALL_DEFINE3(flistxattr, int, fd, char __user *, list, size_t, size)
 {
-	struct fd f = fdget(fd);
-	ssize_t error = -EBADF;
+	CLASS(fd, f)(fd);
 
-	if (!fd_file(f))
-		return error;
+	if (fd_empty(f))
+		return -EBADF;
 	audit_file(fd_file(f));
-	error = listxattr(fd_file(f)->f_path.dentry, list, size);
-	fdput(f);
-	return error;
+	return listxattr(fd_file(f)->f_path.dentry, list, size);
 }
 
 /*
@@ -950,12 +944,12 @@ SYSCALL_DEFINE2(lremovexattr, const char __user *, pathname,
 
 SYSCALL_DEFINE2(fremovexattr, int, fd, const char __user *, name)
 {
-	struct fd f = fdget(fd);
+	CLASS(fd, f)(fd);
 	char kname[XATTR_NAME_MAX + 1];
-	int error = -EBADF;
+	int error;
 
-	if (!fd_file(f))
-		return error;
+	if (fd_empty(f))
+		return -EBADF;
 	audit_file(fd_file(f));
 
 	error = strncpy_from_user(kname, name, sizeof(kname));
@@ -970,7 +964,6 @@ SYSCALL_DEFINE2(fremovexattr, int, fd, const char __user *, name)
 				    fd_file(f)->f_path.dentry, kname);
 		mnt_drop_write_file(fd_file(f));
 	}
-	fdput(f);
 	return error;
 }