FILE_UPDATE_TIME(9) The Linux VFS FILE_UPDATE_TIME(9)
NAME file_update_time - update mtime and ctime time
SYNOPSIS void file_update_time(struct file * file);
ARGUMENTS file file accessed
DESCRIPTION Update the mtime and ctime members of an inode and mark the inode for writeback. Note that this function is meant exclusively for usage in the file write path of filesystems, and filesystems may choose to explicitly ignore update via this function with the S_NOCMTIME inode flag, e.g. for network filesystem where these timestamps are handled by the server.
COPYRIGHT Kernel Hackers Manual 2.6. November 2011 FILE_UPDATE_TIME(9)