REQ_FAILFAST flag in async calls

[dv9999 <dyu9999@yahoo.com>]

Hi Linux kernel scsi experts, 

I would appreciate some information from you or dm-devel on the following:

I am wondering how to pass and support REQ_FAILFAST in scsi_execute_async
function in latest kernel. In sync mode (scsi_execute), caller can pass this
as flag parameter, but how this is done in case of scsi_execute_async?

Thanks.
Dave

Note: the comment below is not accurate in kernel code...

/**
 * scsi_execute_async - insert request
 * @sdev:       scsi device
 * @cmd:        scsi command
 * @cmd_len:    length of scsi cdb
 * @data_direction: data direction
 * @buffer:     data buffer (this can be a kernel buffer or scatterlist)
 * @bufflen:    len of buffer
 * @use_sg:     if buffer is a scatterlist this is the number of elements
 * @timeout:    request timeout in seconds
 * @retries:    number of times to retry request
 * @flags:      or into request flags
 **/
int scsi_execute_async(struct scsi_device *sdev, const unsigned char *cmd,
                       int cmd_len, int data_direction, void *buffer,
unsigned bufflen,
                       int use_sg, int timeout, int retries, void *privdata,
                       void (*done)(void *, char *, int, int), gfp_t gfp)





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