req_state
0 -> request not in use
1 -> request has been sent, but is not finished (i.e. it is
between stages 1 and 2 in the "theory of operation")
2 -> request is ready to be read() (i.e. it is between stages
2 and 3 in the "theory of operation")
orphan
0 -> normal request
1 -> request sent by SG_IO ioctl() which has been interrupted
by a signal
sg_io_owned
0 -> request sent by a write()
1 -> request sent by a SG_IO ioctl()
problem
0 -> no problem (or 1 == req_state)
1 -> req_state is 2 and either masked_status, host_status or
driver_status is non-zero
duration
[if 1 == req_state] time since request was sent (in millisecs)
[if 2 == req_state] duration of request (in millisecs). Clock
is stopped when stage 2 in "theory of operation" is
reached
pack_id
usr_ptr
these are user provided values in the sg_io_hdr_t (or
struct sg_header) that sent the request |
