Description of problem:
After umounting and mounting an NFS volume, the cache is ignored.
Version-Release number of selected component (if applicable):
Fedora 30 with cachefilesd 0.10.10
echo '/NFS CLIENT(OPTIONS)' >> /etc/exports
systemctl restart nfs-server.service
yum -y install cachefilesd
systemctl enable --now cachefilesd
Steps to Reproduce:
1. mount -t nfs -o fsc SERVER:/NFS /nfs
2. time md5sum /nfs/FILE
3. time md5sum /nfs/FILE
4. umount /nfs
5. mount -t nfs -o fsc SERVER:/NFS /nfs
6. time md5sum /nfs/FILE
Step (2) fills the cache and step (3) uses the cache. Step (6) always reloads the file from the server.
Step (6) should use the cache.
- The cache works with CentOS 7.6 and cachefilesd 0.10.7, but shows the problem with Fedora 30 and cachefilesd 0.10.7.
- The problem also occurs in CentOS 7.6 if you specify a directory other than /var/cache/fscache for the cache in /etc/cachefilesd.conf.
- Each mount operation uses the same options. (https://access.redhat.com/documentation/en-us/red_hat_enterprise_linux/6/html/storage_administration_guide/fscachenfs)
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