Get the fsid of the cluster as a hexadecimal string.
The fsid is a unique id of an entire Ceph cluster.
@param cluster where to get the fsid
@param buf where to write the fsid
@param len the size of buf in bytes (should be 37)
@returns 0 on success, negative error code on failure
@returns -ERANGE if the buffer is too short to contain the
fsid
Get the fsid of the cluster as a hexadecimal string.
The fsid is a unique id of an entire Ceph cluster.
@param cluster where to get the fsid @param buf where to write the fsid @param len the size of buf in bytes (should be 37) @returns 0 on success, negative error code on failure @returns -ERANGE if the buffer is too short to contain the fsid