[PATCH 2/2] bcachefs: Simplify bch2_xattr_emit() implementation

[Youling Tang <youling.tang@linux.dev>]

From: Youling Tang <tangyouling@kylinos.cn>

Use helper functions to make code more readable.

Similar to commit a5488f29835c ("fs: simplify ->listxattr() implementation")

Signed-off-by: Youling Tang <tangyouling@kylinos.cn>
---
 fs/bcachefs/xattr.c | 22 ++++++++++++++++------
 1 file changed, 16 insertions(+), 6 deletions(-)

diff --git a/fs/bcachefs/xattr.c b/fs/bcachefs/xattr.c
index 9e77e949a29b..e64e2c47b6ca 100644
--- a/fs/bcachefs/xattr.c
+++ b/fs/bcachefs/xattr.c
@@ -251,17 +251,27 @@ static int __bch2_xattr_emit(const char *prefix,
 	return 0;
 }
 
+static inline const char *bch2_xattr_prefix(unsigned type, struct dentry *dentry)
+{
+	const struct xattr_handler *handler = bch2_xattr_type_to_handler(type);
+
+	if (!xattr_handler_can_list(handler, dentry))
+		return NULL;
+
+	return xattr_prefix(handler);
+}
+
 static int bch2_xattr_emit(struct dentry *dentry,
 			    const struct bch_xattr *xattr,
 			    struct xattr_buf *buf)
 {
-	const struct xattr_handler *handler =
-		bch2_xattr_type_to_handler(xattr->x_type);
+	const char *prefix;
+
+	prefix = bch2_xattr_prefix(xattr->x_type, dentry);
+	if (!prefix)
+		return 0;
 
-	return handler && (!handler->list || handler->list(dentry))
-		? __bch2_xattr_emit(handler->prefix ?: handler->name,
-				    xattr->x_name, xattr->x_name_len, buf)
-		: 0;
+	return __bch2_xattr_emit(prefix, xattr->x_name, xattr->x_name_len, buf);
 }
 
 static int bch2_xattr_list_bcachefs(struct bch_fs *c,
-- 
2.34.1