On Thu, Mar 02, 2017 at 11:02:10AM -0500, Olga Kornievskaia wrote: > Allow nfs_copy_file_range to copy across devices. > NFSv4.2 inter server to server copy always copies across devices, and > NFSv4.2 intra server to server copy can copy across devices on the same > server. > > If a file system's fileoperations copy_file_range operation prohibits > cross-device copies, fall back to do_splice_direct. This is needed for > nfsd_copy_file_range() which is called by the inter server to server > destination server acting as an NFS client, and reading the file from > the source server. NAK, we really should not do operations between different superblocks.
