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    Subject[PATCH 4.10 04/69] tcmu: Fix wrongly calculating of the base_command_size
    Date
    4.10-stable review patch.  If anyone has any objections, please let me know.

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

    From: Xiubo Li <lixiubo@cmss.chinamobile.com>

    commit abe342a5b4b5aa579f6bf40ba73447c699e6b579 upstream.

    The t_data_nents and t_bidi_data_nents are the numbers of the
    segments, but it couldn't be sure the block size equals to size
    of the segment.

    For the worst case, all the blocks are discontiguous and there
    will need the same number of iovecs, that's to say: blocks == iovs.
    So here just set the number of iovs to block count needed by tcmu
    cmd.

    Tested-by: Ilias Tsitsimpis <iliastsi@arrikto.com>
    Reviewed-by: Mike Christie <mchristi@redhat.com>
    Signed-off-by: Xiubo Li <lixiubo@cmss.chinamobile.com>
    Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

    ---
    drivers/target/target_core_user.c | 10 ++++++++--
    1 file changed, 8 insertions(+), 2 deletions(-)

    --- a/drivers/target/target_core_user.c
    +++ b/drivers/target/target_core_user.c
    @@ -404,6 +404,13 @@ static inline size_t tcmu_cmd_get_data_l
    return data_length;
    }

    +static inline uint32_t tcmu_cmd_get_block_cnt(struct tcmu_cmd *tcmu_cmd)
    +{
    + size_t data_length = tcmu_cmd_get_data_length(tcmu_cmd);
    +
    + return data_length / DATA_BLOCK_SIZE;
    +}
    +
    static sense_reason_t
    tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd)
    {
    @@ -431,8 +438,7 @@ tcmu_queue_cmd_ring(struct tcmu_cmd *tcm
    * expensive to tell how many regions are freed in the bitmap
    */
    base_command_size = max(offsetof(struct tcmu_cmd_entry,
    - req.iov[se_cmd->t_bidi_data_nents +
    - se_cmd->t_data_nents]),
    + req.iov[tcmu_cmd_get_block_cnt(tcmu_cmd)]),
    sizeof(struct tcmu_cmd_entry));
    command_size = base_command_size
    + round_up(scsi_command_size(se_cmd->t_task_cdb), TCMU_OP_ALIGN_SIZE);

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