scsi_status(9S) Data Structures for Drivers scsi_status(9S)NAMEscsi_status - SCSI status structure
SYNOPSIS
#include <sys/scsi/scsi.h>
INTERFACE LEVEL
Solaris DDI specific (Solaris DDI)
DESCRIPTION
The SCSI-2standard defines a status byte that is normally sent by the
target to the initiator during the status phase at the completion of
each command.
STRUCTURE MEMBERS
uchar sts_scsi2 :1; /* SCSI-2 modifier bit */
uchar sts_is :1; /* intermediate status sent */
uchar sts_busy :1; /* device busy or reserved */
uchar sts_cm :1; /* condition met */
ucha sts_chk :1; /* check condition */
sts_chk indicates that a contingent allegiance condition has occurred.
sts_cm is returned whenever the requested operation is satisfied
sts_busy indicates that the target is busy. This status is returned
whenever a target is unable to accept a command from an otherwise
acceptable initiator (that is, no reservation conflicts). The recom‐
mended initiator recovery action is to issue the command again later.
sts_is is returned for every successfully completed command in a series
of linked commands (except the last command), unless the command is
terminated with a check condition status, reservation conflict, or com‐
mand terminated status. Note that host bus adapter drivers may not sup‐
port linked commands (see scsi_ifsetcap(9F)). If sts_is and sts_busy
are both set, then a reservation conflict has occurred.
sts_scsi2 is the SCSI-2 modifier bit. If sts_scsi2 and sts_chk are both
set, this indicates a command terminated status. If sts_scsi2 and
sts_busy are both set, this indicates that the command queue in the
target is full.
For accessing the status as a byte, the following values are appropri‐
ate:
STATUS_GOOD This status indicates that the target
has successfully completed the command.
STATUS_CHECK This status indicates that a contingent
allegiance condition has occurred.
STATUS_MET This status is returned when the
requested operations are satisfied.
STATUS_BUSY This status indicates that the target
is busy.
STATUS_INTERMEDIATE This status is returned for every suc‐
cessfully completed command in a series
of linked commands.
STATUS_SCSI2 This is the SCSI-2 modifier bit.
STATUS_INTERMEDIATE_MET This status is a combination of STA‐
TUS_MET and STATUS_INTERMEDIATE.
STATUS_RESERVATION_CONFLICT This status is a combination of STA‐
TUS_INTERMEDIATE and STATUS_BUSY, and
it is returned whenever an initiator
attempts to access a logical unit or an
extent within a logical unit is
reserved.
STATUS_TERMINATED This status is a combination of STA‐
TUS_SCSI2 and STATUS_CHECK, and it is
returned whenever the target terminates
the current I/O process after receiving
a terminate I/O process message.
STATUS_QFULL This status is a combination of STA‐
TUS_SCSI2 and STATUS_BUSY, and it is
returned when the command queue in the
target is full.
SEE ALSOscsi_ifgetcap(9F), scsi_init_pkt(9F), scsi_extended_sense(9S),
scsi_pkt(9S)
Writing Device Drivers
SunOS 5.10 30 Aug 1995 scsi_status(9S)
