btrfs: rename inode number parameter passed to btrfs_check_dir_item_collision()

The name 'dir' is misleading as it's the inode number of the directory,
so rename it accordingly.

Signed-off-by: David Sterba <dsterba@suse.com>

Author: kdave

fs/btrfs/dir-item.c

@@ -227,7 +227,7 @@ struct btrfs_dir_item *btrfs_lookup_dir_item(struct btrfs_trans_handle *trans,
 	return di;
 }
 
-int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir,
+int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir_ino,
 				   const struct fscrypt_str *name)
 {
 	int ret;
@@ -242,7 +242,7 @@ int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir,
 	if (!path)
 		return -ENOMEM;
 
-	key.objectid = dir;
+	key.objectid = dir_ino;
 	key.type = BTRFS_DIR_ITEM_KEY;
 	key.offset = btrfs_name_hash(name->name, name->len);
 

fs/btrfs/dir-item.h

@@ -14,7 +14,7 @@ struct btrfs_inode;
 struct btrfs_root;
 struct btrfs_trans_handle;
 
-int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir,
+int btrfs_check_dir_item_collision(struct btrfs_root *root, u64 dir_ino,
 			  const struct fscrypt_str *name);
 int btrfs_insert_dir_item(struct btrfs_trans_handle *trans,
 			  const struct fscrypt_str *name, struct btrfs_inode *dir,