[Linux-cachefs] FScache not working

[David Howells]

Rince <rincebrain at gmail.com> wrote:

> # cat /proc/fs/nfsfs/*
> NV SERVER   PORT USE HOSTNAME
> v4 80dc463e  801  12 mant1
> NV SERVER   PORT DEV     FSID              FSC
> v4 80dc463e  801 0:19    9eab9d085c14652a  no
> v4 80dc463e  801 0:22    c8654208da0d3669  no
> v4 80dc463e  801 0:20    212b2508ae922d14  no
> v4 80dc463e  801 0:21    f0b58c08259e50c5  no
> v4 80dc463e  801 0:23    cd9b8d087773ec8f  no
> v4 80dc463e  801 0:24    ef1fea0808113729  no
> v4 80dc463e  801 0:25    138c1408eb63c29c  no
> v4 80dc463e  801 0:26    f0bc74085499dbc1  no
> v4 80dc463e  801 0:27    4c0fa308cfa9eacf  no
> v4 80dc463e  801 0:28    84d624087111280d  no
> v4 80dc463e  801 0:29    a053d5083534c623  no
> v4 80dc463e  801 0:30    2295d1089ac79a7c  no

I think that the problem you're seeing is one I'm also seeing.  A patch went
into the latest round of kernels that breaks fscache for NFS because the 'fsc'
flag isn't inherited across automount points.  What happened is that the
lookup for mount is now done differently, and so the 'fsc' option is only
applied to the '/' volume from the server, and not any other volume under
that.

I should have a patch for you to try shortly.

David