• Trond Myklebust's avatar
    nfsd: fix nfs read eof detection · 83a63072
    Trond Myklebust authored
    Currently, the knfsd server assumes that a short read indicates an
    end of file. That assumption is incorrect. The short read means that
    either we've hit the end of file, or we've hit a read error.
    In the case of a read error, the client may want to retry (as per the
    implementation recommendations in RFC1813 and RFC7530), but currently it
    is being told that it hit an eof.
    Move the code to detect eof from version specific code into the generic
    nfsd read.
    Report eof only in the two following cases:
    1) read() returns a zero length short read with no error.
    2) the offset+length of the read is >= the file size.
    Signed-off-by: default avatarTrond Myklebust <trond.myklebust@hammerspace.com>
    Signed-off-by: default avatarJ. Bruce Fields <bfields@redhat.com>