Hi All, Current ext4_page_mkwrite() implementation always allocates a block through ext4_get_block_write() or ext4_get_block(). Commit: 9ea7df534ed2a18157434a496a12cf073ca00c52 removed the calls to write_begin() to avoid calling ext4_da_write_begin() as calling it from here is racy. So for now, in ext4: delayed allocation is not supported under an mmap call? Regards, Surbhi. -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html