On Sat, 2015-11-28 at 06:49 +0000, Duncan wrote: > Christoph Anton Mitterer posted on Sat, 28 Nov 2015 04:57:05 +0100 as > excerpted: > > Still, specifically for snapshots that's a bit unhandy, as one > > typically > > doesn't mount each of them... one rather mount e.g. the top level > > subvol > > and has a subdir snapshots there... > > So perhaps the idea of having snapshots that are per se noatime is > > still > > not too bad. > Read-only snapshots? So you basically mean that ro snapshots won't have their atime updated even without noatime? Well I guess that was anyway the recent behaviour of Linux filesystems, and only very old UNIX systems updated the atime even when the fs was set ro.
> That'd do it, and of course you can toggle the read- > only property (see btrfs property and its btrfs-property manpage). Sure, but then it would still be nice for rw snapshots. I guess what I probably actually want is the ability to set noatime as a property. I'll add that in a "feature request" on the project ideas wiki. > Alternatively, mount the toplevel subvol read-only or noatime on one > mountpoint, and bind-mount it read-write or whatever other > appropriate Well it's of course somehow possible... but that seems a bit ugly to me... the best IMHO, would really be if one could set a property on snapshots that marks them noatime. Cheers, Chris.
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