On Wed, Mar 07, 2018 at 11:08:56AM -0500, Theodore Y. Ts'o wrote:
> This is where it's critcal to understand that the "tune2fs -o" changes
> the *default* mount options. The key in the comment is the anything
> different from the *filesystem* defaults (that is, the defaults of the
> particular ext4 file system, as opposed to the global defaults). The
> idea is that /proc/mounts, and /etc/mtab shows the options string that
> if used in /etc/fstab, or in the mount command line, will replicate
> the current mount option state. Furthermore, that /proc/mounts is the
> minimal set of mount option strings.
One more question about this.
Trying to use tune2fs -E mount_opts to set some default options, and
can't figure out how to enter two options at once.
tune2fs -E mount_opts=nodelalloc,nouser_xattr /dev/sda3
gives the error:
tune2fs 1.43.4 (31-Jan-2017)
Bad options specified.
Extended options are separated by commas, and may take an argument which
is set off by an equals ('=') sign.
Valid extended options are:
mount_opts=<extended default mount options>
stride=<RAID per-disk chunk size in blocks>
stripe_width=<RAID stride*data disks in blocks>
Apparently it gets confused by the , in the argument to mount_opts.
Unfortunately , happens to be the separator required by ext4 for that
field. So how does one use it?
Sure in this case I can set one with -o and the other with -E, but in
general there seems to be a small problem here, probably only in user
space though. Seems tune2fs needs some change in how it deals with
extended options that contain commas.