On Mon, 03.01.11 09:54, Chris Adams (cmadams@xxxxxxxxxx) wrote: > > Once upon a time, Adam Jackson <ajax@xxxxxxxxxx> said: > > Sadly this turns out not to be the case, at least if I'm reading > > fs/pipe.c correctly. O_NOATIME will turn off atime updates, but mtime > > and ctime are still modified on every pipe write, and there's no such > > thing as O_NOCMTIME even though the filesystem layer does have the > > concept internally. Which means device-backed filesystems will see > > write traffic just for using named pipes. > > > > Heck of lame. Someone should fix that. > > The behavior follows the standard, so it shouldn't just be changed by > default without checking if anybody uses the standard behavior. Well, I think introducing O_NOCTIME the same way O_NOATIME was introduced would be unproblematic: only if it is set the normal ctime behaviour would be disabled. But yeah, I agree with ajax, the fact that the ctime of a fifo is updated all the time and there is no way around it is kinda ridiculous... And it gives the jack folks a really good reason not to stick a fifo into /tmp. Lennart -- Lennart Poettering - Red Hat, Inc. -- devel mailing list devel@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/devel
