On 2007/05/16 19:00, Jean-Yves Boisiaud wrote: > Stuart Henderson wrote: >> On 2007/05/16 11:33, Jean-Yves Boisiaud wrote: >>> I want to limit write accesses on the compact flash, so I mounted / read >>> only, with the noatime option. /var is mounted in RAM. >> Do you know that you need more than fstab(5) changes to mount / RO? >>> Yes, I could create a mfs partition for /dev, but I think it is too >>> dangerous. >> Works fine, you can use the -P flag to populate from another >> directory. Copy MAKEDEV into that directory and run it to setup; >> do the same at upgrade time. Also keep the existing /dev. > I copied the /dev tree in /var/run/dev, which is detared from /var.tgz > during boot. Then I run : > > mount_mfs -i 256 -s 592 -P /var/run/dev swap /dev > > And it is ok.
With -current, those -i and -s values will give you $ sudo mount_mfs -i 256 -s 592 swap /mnt $ sudo df -i /mnt Filesystem 1K-blocks Used Avail Capacity iused ifree %iused Mounted on mfs:31139 151 1 143 1% 1 509 0% /mnt Same as if you specify -i 1024. I don't know if anything will change in that regard between now and 4.2, but that's the way it is now. (yes, I did discover this change on remote kit, but I already had good remote console access available so it didn't involve 4 hours travel to fix :-) Don't bother to keep -s super-small; memory is only used to hold the files that have actually been written, it is not pre-allocated to the mfs. Your /dev seems to be missing something.. My production routers look like this, with over 2x the number of inodes used: $ grep /dev /etc/fstab swap /dev mfs rw,nosuid,-s=4096,-i=1024,-P=/dev_src 0 0 $ df -i /mnt Filesystem 1K-blocks Used Avail Capacity iused ifree %iused Mounted on mfs:19099 1679 34 1562 2% 1350 952 59% /dev
