ntfs3: Refactor duplicate kmemdup pattern in do_action()

Extract the repeated pattern of duplicating attribute and updating
OpenAttr into a helper function to reduce code duplication and improve
maintainability.

Signed-off-by: Baolin Liu <liubaolin@kylinos.cn>
Signed-off-by: Konstantin Komarov <almaz.alexandrovich@paragon-software.com>

Author: murphy12138

fs/ntfs3/fslog.c

@@ -3030,6 +3030,26 @@ static struct ATTRIB *attr_create_nonres_log(struct ntfs_sb_info *sbi,
 	return attr;
 }
 
+/*
+ * update_oa_attr - Synchronize OpenAttr's attribute pointer with modified attribute
+ * @oa2: OpenAttr structure in memory that needs to be updated
+ * @attr: Modified attribute from MFT record to duplicate
+ *
+ * Returns true on success, false on allocation failure.
+ */
+static bool update_oa_attr(struct OpenAttr *oa2, struct ATTRIB *attr)
+{
+	void *p2;
+
+	p2 = kmemdup(attr, le32_to_cpu(attr->size), GFP_NOFS);
+	if (p2) {
+		kfree(oa2->attr);
+		oa2->attr = p2;
+		return true;
+	}
+	return false;
+}
+
 /*
  * do_action - Common routine for the Redo and Undo Passes.
  * @rlsn: If it is NULL then undo.
@@ -3253,15 +3273,8 @@ static int do_action(struct ntfs_log *log, struct OPEN_ATTR_ENRTY *oe,
 			le16_add_cpu(&rec->hard_links, 1);
 
 		oa2 = find_loaded_attr(log, attr, rno_base);
-		if (oa2) {
-			void *p2 = kmemdup(attr, le32_to_cpu(attr->size),
-					   GFP_NOFS);
-			if (p2) {
-				// run_close(oa2->run1);
-				kfree(oa2->attr);
-				oa2->attr = p2;
-			}
-		}
+		if (oa2)
+			update_oa_attr(oa2, attr);
 
 		mi->dirty = true;
 		break;
@@ -3320,16 +3333,8 @@ static int do_action(struct ntfs_log *log, struct OPEN_ATTR_ENRTY *oe,
 			memmove(Add2Ptr(attr, aoff), data, dlen);
 
 		oa2 = find_loaded_attr(log, attr, rno_base);
-		if (oa2) {
-			void *p2 = kmemdup(attr, le32_to_cpu(attr->size),
-					   GFP_NOFS);
-			if (p2) {
-				// run_close(&oa2->run0);
-				oa2->run1 = &oa2->run0;
-				kfree(oa2->attr);
-				oa2->attr = p2;
-			}
-		}
+		if (oa2 && update_oa_attr(oa2, attr))
+			oa2->run1 = &oa2->run0;
 
 		mi->dirty = true;
 		break;
@@ -3379,14 +3384,9 @@ static int do_action(struct ntfs_log *log, struct OPEN_ATTR_ENRTY *oe,
 			attr->nres.total_size = new_sz->total_size;
 
 		oa2 = find_loaded_attr(log, attr, rno_base);
-		if (oa2) {
-			void *p2 = kmemdup(attr, le32_to_cpu(attr->size),
-					   GFP_NOFS);
-			if (p2) {
-				kfree(oa2->attr);
-				oa2->attr = p2;
-			}
-		}
+		if (oa2)
+			update_oa_attr(oa2, attr);
+
 		mi->dirty = true;
 		break;