[Hit "reply" instead of "Reply to all".. I'm sorry for a repost] On 29.04.2012 11:19, Linus Torvalds wrote: [] >> /proc/1/fdinfo/16 -- the autofs pipe fd# -- shows flags=02004000 >> which is O_CLOEXEC|O_NONBLOCK, but this is the other end of the >> pipe.. shouldn't the READ side of the pipe have O_DIRECT flag now? > > Gaah, it should, but it won't. > > I bet my original patch worked fine, because the pipe has only one > inode and pipe structure. But it has *two* 'struct file's associated > with it, and autofs only ever sees the writing side, and never gets to > mark the reading side O_DIRECT. So yeah, the reading side won't do the > proper packetized read. Can't we go - in kernel - from one struct file to pipe structure to another file structure and set O_DIRECT there? Autofs kernel code checks if the file descriptor is a pipe, so it should be possible... Thanks, /mjt -- To unsubscribe from this list: send the line "unsubscribe autofs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
