[Bug 1661036] [NEW] nfsmount from klibc-utils doesn't support 'fsc' option

[Mantas Kriaučiūnas]

Public bug reported:

I'm PXE-booting a Ubuntu 16.04 system, where I specify the kernel
parameters as follows:

root=/dev/nfs nfsroot=10.0.0.1:/srv/tftp/ubuntu-baltix,fsc ip=dhcp rw

After I added fsc option to kernel command line I get the following
error upon boot:

nfsmount: bad option 'fsc'

I need to use the mount option 'fsc' in order to use FS-cache functionality (the cachefilesd package.)
Why doesn't nfsmount permit this option? (It works fine when you mount manually with mount -o fsc after booting up.)

I changed nfsmount to mount.nfs in the file /usr/share/initramfs-tools/scripts/nfs and 
added mount.nfs from /sbin to the initramfs image (copied to the /usr/lib/klibc/bin folder)

Then ran update-initramfs -u to update the initramfs image and now
system boots without error.

This problem exists in older Ubuntu releases too, see
http://askubuntu.com/questions/23767/using-the-fsc-mount-option-with-
nfsroot-kernel-parameter-to-allow-fs-cache

** Affects: klibc (Ubuntu)
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1661036

Title:
  nfsmount from klibc-utils doesn't support 'fsc' option

Status in klibc package in Ubuntu:
  New

Bug description:
  I'm PXE-booting a Ubuntu 16.04 system, where I specify the kernel
  parameters as follows:

  root=/dev/nfs nfsroot=10.0.0.1:/srv/tftp/ubuntu-baltix,fsc ip=dhcp rw

  After I added fsc option to kernel command line I get the following
  error upon boot:

  nfsmount: bad option 'fsc'

  I need to use the mount option 'fsc' in order to use FS-cache functionality (the cachefilesd package.)
  Why doesn't nfsmount permit this option? (It works fine when you mount manually with mount -o fsc after booting up.)

  I changed nfsmount to mount.nfs in the file /usr/share/initramfs-tools/scripts/nfs and 
  added mount.nfs from /sbin to the initramfs image (copied to the /usr/lib/klibc/bin folder)

  Then ran update-initramfs -u to update the initramfs image and now
  system boots without error.

  This problem exists in older Ubuntu releases too, see
  http://askubuntu.com/questions/23767/using-the-fsc-mount-option-with-
  nfsroot-kernel-parameter-to-allow-fs-cache

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