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    Subject[PATCH] ipconfig: send host-name in DHCP requests
    Normally dhclient can be configured to send the "host-name" option
    in DHCP requests to update the client's DNS record. However for an
    NFSROOT system, dhclient shall never be called (which may change the
    IP addr and therefore lose your root NFS mount connection).

    So enable updating the DNS record with kernel parameter

    ip=::::$HOST_NAME::dhcp

    Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>
    ---
    net/ipv4/ipconfig.c | 7 +++++++
    1 files changed, 7 insertions(+), 0 deletions(-)

    diff --git a/net/ipv4/ipconfig.c b/net/ipv4/ipconfig.c
    index 067ce9e..db54343 100644
    --- a/net/ipv4/ipconfig.c
    +++ b/net/ipv4/ipconfig.c
    @@ -665,6 +665,13 @@ ic_dhcp_init_options(u8 *options)
    memcpy(e, ic_req_params, sizeof(ic_req_params));
    e += sizeof(ic_req_params);

    + if (ic_host_name_set) {
    + *e++ = 12; /* host-name */
    + len = strlen(utsname()->nodename);
    + *e++ = len;
    + memcpy(e, utsname()->nodename, len);
    + e += len;
    + }
    if (*vendor_class_identifier) {
    printk(KERN_INFO "DHCP: sending class identifier \"%s\"\n",
    vendor_class_identifier);
    --
    1.6.6


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