struct inode * ntfs_attr_iget (struct inode * base_vi, ATTR_TYPE type, ntfschar * name, u32 name_len);
Obtain the (fake) struct inode corresponding to the attribute specified by type, name, and name_len, which is present in the base mft record specified by the vfs inode base_vi.
If the attribute inode is in the cache, it is just returned with an increased reference count. Otherwise, a new struct inode is allocated and initialized, and finally ntfs_read_locked_attr_inode is called to read the attribute and fill in the inode structure.
Note, for index allocation attributes, you need to use ntfs_index_iget instead of ntfs_attr_iget as working with indices is a lot more complex.
Return the struct inode of the attribute inode on success. Check the return value with IS_ERR and if true, the function failed and the error code is obtained from PTR_ERR.