I believe they have: if I just run "mount", it shows the new options that I specified. I know they work because I did encounter the "mount point not mounted or bad option." error when I was trying to figure out what options it would accept. I reckon that because this is D-Link's stupid flavour of Linux (with a 2.6 kernel, not even the latest 2.6 kernel either) that it just doesn't behave as you'd expect it to. I have found it to behave oddly in many different respects.
I have observed faster disk write speeds after changing the mount options (significant - 20% quicker for sustained contiguous writes), so I'm reasonably sure they have applied, but I could be wrong. Is there another different way to check? Hamish On 29/08/2020 09:42, Ralph Corderoy wrote: > Hello Hamish, > >> Good idea, but sadly that just shows the default mount options. > Then that suggests they haven't been changed, at least if that old > kernel matches mine here. > > Make an ext4 filesystem and mount point. > > $ dd if=/dev/zero bs=2M count=1 of=fs.img > 1+0 records in > 1+0 records out > 2097152 bytes (2.1 MB, 2.0 MiB) copied, 0.0164876 s, 127 MB/s > $ mkfs -t ext4 fs.img > mke2fs 1.45.2 (27-May-2019) > Discarding device blocks: done > Creating filesystem with 2048 1k blocks and 256 inodes > > Allocating group tables: done > Writing inode tables: done > Creating journal (1024 blocks): done > Writing superblocks and filesystem accounting information: done > > $ mkdir mnt > $ > > Mount it with duff options. > > $ sudo mount -o loop,data=writeback,barrier=0,commit=30 fs.img mnt > $ fgrep $PWD /proc/$$/mountinfo > 753 193 7:1 / /home/tmp/1598690175.392785701/mnt rw,relatime shared:408 - > ext4 /dev/loop1 rw,nobarrier,commit=30,data=writeback > $ > > Attempt to change all of them to sane ones. > > $ sudo mount -o loop,remount,data=ordered,barrier=1,commit=5 fs.img mnt > mount: /home/tmp/1598690175.392785701/mnt: mount point not mounted or bad > option. > $ fgrep $PWD /proc/$$/mountinfo > 753 193 7:1 / /home/tmp/1598690175.392785701/mnt rw,relatime shared:408 - > ext4 /dev/loop1 rw,nobarrier,commit=30,data=writeback > $ > > None of them change. It's because it's not possible to change ‘data’ > with remount. > > Change the other two options. > > $ sudo mount -o loop,remount,barrier=1,commit=5 fs.img mnt > $ fgrep $PWD /proc/$$/mountinfo > 753 193 7:1 / /home/tmp/1598690175.392785701/mnt rw,relatime shared:408 - > ext4 /dev/loop1 rw,data=writeback > $ > > Try again to change the remaining one. > > $ sudo mount -o loop,remount,data=ordered fs.img mnt > mount: /home/tmp/1598690175.392785701/mnt: mount point not mounted or bad > option. > $ fgrep $PWD /proc/$$/mountinfo > 753 193 7:1 / /home/tmp/1598690175.392785701/mnt rw,relatime shared:408 - > ext4 /dev/loop1 rw,data=writeback > $ > > Still doesn't work. > > $ sudo umount mnt > $ > > So if... > >> Good idea, but sadly that just shows the default mount options. > ...then it suggests none of your remount-option changes have taken > effect? >
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