libnfs error writing to Amazon EFS

[jo...@berkeley.edu]

Hi,

I'm trying to use libnfs to read from and write to Amazon EFS.

I'm getting errors when using the nfs_pwrite(..) interface with buffers larger than a few KBs. If for instance I pass a buffer with 3900 bytes, libnfs fails in lib/libnfs-zdr.c:

# at this point zdrs->pos=256, size=3900, zdrs->size=4096

173         if (zdrs->pos + (int)*size > zdrs->size) {

177                 return FALSE;

178         }

Similarly, nfs-cp utility also fails when copying a file to EFS, as can be seen when I do the following commands.

# copying a file from EFS to local server works well

./utils/nfs-cp "nfs://fs-ac79ac05.efs.us-west-2.amazonaws.com//test3?version=4&nfsport=2049" test3

copied 41 bytes

# however, copying to EFS does not work (a file with 0 length is created)

./utils/nfs-cp "nfs://fs-ac79ac05.efs.us-west-2.amazonaws.com//test3?version=4&nfsport=2049" "nfs://fs-ac79ac05.efs.us-west-2.amazonaws.com//test3-2?version=4&nfsport=2049"

Failed to write to dest file

Any ideas how to make this work?

Thanks!