• Chuck Lever's avatar
    NFS: Account for XDR pad of buf->pages · 02ef04e4
    Chuck Lever authored
    Certain NFS results (eg. READLINK) might expect a data payload that
    is not an exact multiple of 4 bytes. In this case, XDR encoding
    is required to pad that payload so its length on the wire is a
    multiple of 4 bytes. The constants that define the maximum size of
    each NFS result do not appear to account for this extra word.
    
    In each case where the data payload is to be received into pages:
    
    - 1 word is added to the size of the receive buffer allocated by
      call_allocate
    
    - rpc_inline_rcv_pages subtracts 1 word from @hdrsize so that the
      extra buffer space falls into the rcv_buf's tail iovec
    
    - If buf->pagelen is word-aligned, an XDR pad is not needed and
      is thus removed from the tail
    Signed-off-by: default avatarChuck Lever <chuck.lever@oracle.com>
    Signed-off-by: default avatarAnna Schumaker <Anna.Schumaker@Netapp.com>
    02ef04e4
xdr.c 41.7 KB