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    Subject[PATCH 4.14 046/124] libceph: bump CEPH_MSG_MAX_DATA_LEN
    Date
    4.14-stable review patch.  If anyone has any objections, please let me know.

    ------------------

    From: Ilya Dryomov <idryomov@gmail.com>

    commit 94e6992bb560be8bffb47f287194adf070b57695 upstream.

    If the read is large enough, we end up spinning in the messenger:

    libceph: osd0 192.168.122.1:6801 io error
    libceph: osd0 192.168.122.1:6801 io error
    libceph: osd0 192.168.122.1:6801 io error

    This is a receive side limit, so only reads were affected.

    Cc: stable@vger.kernel.org
    Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    include/linux/ceph/libceph.h | 8 +++++++-
    1 file changed, 7 insertions(+), 1 deletion(-)

    --- a/include/linux/ceph/libceph.h
    +++ b/include/linux/ceph/libceph.h
    @@ -81,7 +81,13 @@ struct ceph_options {

    #define CEPH_MSG_MAX_FRONT_LEN (16*1024*1024)
    #define CEPH_MSG_MAX_MIDDLE_LEN (16*1024*1024)
    -#define CEPH_MSG_MAX_DATA_LEN (16*1024*1024)
    +
    +/*
    + * Handle the largest possible rbd object in one message.
    + * There is no limit on the size of cephfs objects, but it has to obey
    + * rsize and wsize mount options anyway.
    + */
    +#define CEPH_MSG_MAX_DATA_LEN (32*1024*1024)

    #define CEPH_AUTH_NAME_DEFAULT "guest"


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