SCSI_TEST_UNIT_READY(9) SCSI mid layer SCSI_TEST_UNIT_READY(9)NAME
scsi_test_unit_ready - test if unit is ready
SYNOPSIS
int scsi_test_unit_ready(struct scsi_device * sdev, int timeout, int retries, struct scsi_sense_hdr * sshdr_external);
ARGUMENTS
sdev
scsi device to change the state of.
timeout
command timeout
retries
number of retries before failing
sshdr_external
Optional pointer to struct scsi_sense_hdr for returning sense. Make sure that this is cleared before passing in.
DESCRIPTION
Returns zero if unsuccessful or an error if TUR failed. For removable media, a return of NOT_READY or UNIT_ATTENTION is translated to
success, with the ->changed flag updated.
AUTHORS
James Bottomley <James.Bottomley@hansenpartnership.com>
Author.
Rob Landley <rob@landley.net>
Author.
COPYRIGHT Kernel Hackers Manual 2.6. July 2010 SCSI_TEST_UNIT_READY(9)
Check Out this Related Man Page
FC_REMOTE_PORT_ADD(9) SCSI mid layer FC_REMOTE_PORT_ADD(9)NAME
fc_remote_port_add - notify fc transport of the existence of a remote FC port.
SYNOPSIS
struct fc_rport * fc_remote_port_add(struct Scsi_Host * shost, int channel, struct fc_rport_identifiers * ids);
ARGUMENTS
shost
scsi host the remote port is connected to.
channel
Channel on shost port connected to.
ids
The world wide names, fc address, and FC4 port roles for the remote port.
DESCRIPTION
The LLDD calls this routine to notify the transport of the existence of a remote port. The LLDD provides the unique identifiers (wwpn,wwn)
of the port, it's FC address (port_id), and the FC4 roles that are active for the port.
For ports that are FCP targets (aka scsi targets), the FC transport maintains consistent target id bindings on behalf of the LLDD. A
consistent target id binding is an assignment of a target id to a remote port identifier, which persists while the scsi host is attached.
The remote port can disappear, then later reappear, and it's target id assignment remains the same. This allows for shifts in FC addressing
(if binding by wwpn or wwnn) with no apparent changes to the scsi subsystem which is based on scsi host number and target id values.
Bindings are only valid during the attachment of the scsi host. If the host detaches, then later re-attaches, target id bindings may
change.
This routine is responsible for returning a remote port structure. The routine will search the list of remote ports it maintains internally
on behalf of consistent target id mappings. If found, the remote port structure will be reused. Otherwise, a new remote port structure will
be allocated.
Whenever a remote port is allocated, a new fc_remote_port class device is created.
Should not be called from interrupt context.
NOTES
This routine assumes no locks are held on entry.
AUTHORS
James Bottomley <James.Bottomley@hansenpartnership.com>
Author.
Rob Landley <rob@landley.net>
Author.
COPYRIGHT Kernel Hackers Manual 3.10 June 2014 FC_REMOTE_PORT_ADD(9)
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