On Mon, Jun 29, 2020 at 01:33:37PM -0400, Josef Bacik wrote: > On 6/29/20 12:23 PM, J. Bruce Fields wrote: > > Maybe not a desktop question, but do you know btrfs's change > > attribute/i_version status? Does it default to bumping i_version on > > each change, or does that still need to be opted in? And has anyone > > measured the performance delta (i_version vs. noi_version) recently? > > > > Yeah it defaults to bumping it all the time, we just use the normal inode > changing infrastructure so it gets updated the same way everybody else does. > AFAIK there's no way to opt out of it, unless there's a -o noiversion that > exists?
There's both an iversion and noiversion option to mount: https://man7.org/linux/man-pages/man8/mount.8.html#FILESYSTEM-INDEPENDENT_MOUNT%C2%A0OPTIONS It appears that noiversion is the default (though the man page doesn't say so) on ext4 & btrfs, unless my experimentation below is completely off the mark (or something changed recently that my system hasn't picked up yet): $ touch file $ lsattr -v file 628580 -------------------- file ## metadata-only change: $ touch file $ lsattr -v file 628580 -------------------- file ## ^ no change... ## data change: $ echo test > file $ lsattr -v file 628580 -------------------- file ## ^ still no change $ rm file $ touch file $ lsattr -v file 628582 -------------------- file ## ^ now different -- Scott Schmit _______________________________________________ devel mailing list -- devel@lists.fedoraproject.org To unsubscribe send an email to devel-le...@lists.fedoraproject.org Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/devel@lists.fedoraproject.org
