Re: [PATCH RFC] vfs: add a O_NOMTIME flag

On Thu, May 07, 2015 at 06:01:23PM -0700, Sage Weil wrote:

On Thu, 7 May 2015, Zach Brown wrote:

quoted

On Thu, May 07, 2015 at 10:26:17AM +1000, Dave Chinner wrote:

quoted

On Wed, May 06, 2015 at 03:00:12PM -0700, Zach Brown wrote:

quoted

The criteria for using O_NOMTIME is the same as for using O_NOATIME:
owning the file or having the CAP_FOWNER capability.  If we're not
comfortable allowing owners to prevent mtime/ctime updates then we
should add a tunable to allow O_NOMTIME.  Maybe a mount option?

I dislike "turn off safety for performance" options because Joe
SpeedRacer will always select performance over safety.

Well, for ceph there's no safety concern.  They never use cmtime in
these files.

So are you suggesting not implementing this and making them rework their
IO paths to avoid the fs maintaining mtime so that we don't give Joe
Speedracer more rope?  Or are we talking about adding some speed bumps
that ceph can flip on that might give Joe Speedracer pause?

I think this is the fundamental question: who do we give the ammunition 
to, the user or app writer, or the sysadmin?

Yeah, I think this is right.  Dave doesn't want the possibility of it
bleeding in to installations through irresponsible default use in apps
without explicit buy-in from the people responsible for the backups.

[...]

Or, we can be conservative and require a mount option so that the admin 
has to explicitly allow behavior that might break some existing 
assumptions about mtime/ctime ('-o user_noatime' I guess?).

I'm happy either way, so long as in the end an unprivileged ceph daemon 
avoids the useless work.  In our case we always own the entire mount/disk, 
so a mount option is just fine.

It seems that the thread has headed towards responding to my suggestion
of a possible mount option with an enthusiastic "yes, please, no
surprises."

So I'll try that.

- z