[stgt] Retry of failed I/O

[Suresh Rajagopalan]

I'd like to find out what SCSI codes in Tgtd notify the block layer to
retry a failed
I/O.

For example, in the current tgtd backing store code (bs_rdwr.c), a
failed read or writes
sets the following:
static void set_medium_error(int *result, uint8_t *key, uint16_t *asc
{
        *result = SAM_STAT_CHECK_CONDITION;
        *key = MEDIUM_ERROR;
        *asc = ASC_READ_ERROR;
}


While this retries failed reads, failed writes are not retried.   Is there a
particular code that will notify the client block layer to retry the
I/O operation?

Thanks
Suresh
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