245 lines
6.0 KiB
C
245 lines
6.0 KiB
C
/*
|
|
* zfcp device driver
|
|
*
|
|
* Tracking of manually configured LUNs and helper functions to
|
|
* register the LUNs with the SCSI midlayer.
|
|
*
|
|
* Copyright IBM Corporation 2010
|
|
*/
|
|
|
|
#include "zfcp_def.h"
|
|
#include "zfcp_ext.h"
|
|
|
|
/**
|
|
* zfcp_unit_scsi_scan - Register LUN with SCSI midlayer
|
|
* @unit: The zfcp LUN/unit to register
|
|
*
|
|
* When the SCSI midlayer is not allowed to automatically scan and
|
|
* attach SCSI devices, zfcp has to register the single devices with
|
|
* the SCSI midlayer.
|
|
*/
|
|
void zfcp_unit_scsi_scan(struct zfcp_unit *unit)
|
|
{
|
|
struct fc_rport *rport = unit->port->rport;
|
|
unsigned int lun;
|
|
|
|
lun = scsilun_to_int((struct scsi_lun *) &unit->fcp_lun);
|
|
|
|
if (rport && rport->port_state == FC_PORTSTATE_ONLINE)
|
|
scsi_scan_target(&rport->dev, 0, rport->scsi_target_id, lun, 1);
|
|
}
|
|
|
|
static void zfcp_unit_scsi_scan_work(struct work_struct *work)
|
|
{
|
|
struct zfcp_unit *unit = container_of(work, struct zfcp_unit,
|
|
scsi_work);
|
|
|
|
zfcp_unit_scsi_scan(unit);
|
|
put_device(&unit->dev);
|
|
}
|
|
|
|
/**
|
|
* zfcp_unit_queue_scsi_scan - Register configured units on port
|
|
* @port: The zfcp_port where to register units
|
|
*
|
|
* After opening a port, all units configured on this port have to be
|
|
* registered with the SCSI midlayer. This function should be called
|
|
* after calling fc_remote_port_add, so that the fc_rport is already
|
|
* ONLINE and the call to scsi_scan_target runs the same way as the
|
|
* call in the FC transport class.
|
|
*/
|
|
void zfcp_unit_queue_scsi_scan(struct zfcp_port *port)
|
|
{
|
|
struct zfcp_unit *unit;
|
|
|
|
read_lock_irq(&port->unit_list_lock);
|
|
list_for_each_entry(unit, &port->unit_list, list) {
|
|
get_device(&unit->dev);
|
|
if (scsi_queue_work(port->adapter->scsi_host,
|
|
&unit->scsi_work) <= 0)
|
|
put_device(&unit->dev);
|
|
}
|
|
read_unlock_irq(&port->unit_list_lock);
|
|
}
|
|
|
|
static struct zfcp_unit *_zfcp_unit_find(struct zfcp_port *port, u64 fcp_lun)
|
|
{
|
|
struct zfcp_unit *unit;
|
|
|
|
list_for_each_entry(unit, &port->unit_list, list)
|
|
if (unit->fcp_lun == fcp_lun) {
|
|
get_device(&unit->dev);
|
|
return unit;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* zfcp_unit_find - Find and return zfcp_unit with specified FCP LUN
|
|
* @port: zfcp_port where to look for the unit
|
|
* @fcp_lun: 64 Bit FCP LUN used to identify the zfcp_unit
|
|
*
|
|
* If zfcp_unit is found, a reference is acquired that has to be
|
|
* released later.
|
|
*
|
|
* Returns: Pointer to the zfcp_unit, or NULL if there is no zfcp_unit
|
|
* with the specified FCP LUN.
|
|
*/
|
|
struct zfcp_unit *zfcp_unit_find(struct zfcp_port *port, u64 fcp_lun)
|
|
{
|
|
struct zfcp_unit *unit;
|
|
|
|
read_lock_irq(&port->unit_list_lock);
|
|
unit = _zfcp_unit_find(port, fcp_lun);
|
|
read_unlock_irq(&port->unit_list_lock);
|
|
return unit;
|
|
}
|
|
|
|
/**
|
|
* zfcp_unit_release - Drop reference to zfcp_port and free memory of zfcp_unit.
|
|
* @dev: pointer to device in zfcp_unit
|
|
*/
|
|
static void zfcp_unit_release(struct device *dev)
|
|
{
|
|
struct zfcp_unit *unit = container_of(dev, struct zfcp_unit, dev);
|
|
|
|
put_device(&unit->port->dev);
|
|
kfree(unit);
|
|
}
|
|
|
|
/**
|
|
* zfcp_unit_enqueue - enqueue unit to unit list of a port.
|
|
* @port: pointer to port where unit is added
|
|
* @fcp_lun: FCP LUN of unit to be enqueued
|
|
* Returns: 0 success
|
|
*
|
|
* Sets up some unit internal structures and creates sysfs entry.
|
|
*/
|
|
int zfcp_unit_add(struct zfcp_port *port, u64 fcp_lun)
|
|
{
|
|
struct zfcp_unit *unit;
|
|
|
|
unit = zfcp_unit_find(port, fcp_lun);
|
|
if (unit) {
|
|
put_device(&unit->dev);
|
|
return -EEXIST;
|
|
}
|
|
|
|
unit = kzalloc(sizeof(struct zfcp_unit), GFP_KERNEL);
|
|
if (!unit)
|
|
return -ENOMEM;
|
|
|
|
unit->port = port;
|
|
unit->fcp_lun = fcp_lun;
|
|
unit->dev.parent = &port->dev;
|
|
unit->dev.release = zfcp_unit_release;
|
|
INIT_WORK(&unit->scsi_work, zfcp_unit_scsi_scan_work);
|
|
|
|
if (dev_set_name(&unit->dev, "0x%016llx",
|
|
(unsigned long long) fcp_lun)) {
|
|
kfree(unit);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
get_device(&port->dev);
|
|
|
|
if (device_register(&unit->dev)) {
|
|
put_device(&unit->dev);
|
|
return -ENOMEM;
|
|
}
|
|
|
|
if (sysfs_create_group(&unit->dev.kobj, &zfcp_sysfs_unit_attrs)) {
|
|
device_unregister(&unit->dev);
|
|
return -EINVAL;
|
|
}
|
|
|
|
write_lock_irq(&port->unit_list_lock);
|
|
list_add_tail(&unit->list, &port->unit_list);
|
|
write_unlock_irq(&port->unit_list_lock);
|
|
|
|
zfcp_unit_scsi_scan(unit);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* zfcp_unit_sdev - Return SCSI device for zfcp_unit
|
|
* @unit: The zfcp_unit where to get the SCSI device for
|
|
*
|
|
* Returns: scsi_device pointer on success, NULL if there is no SCSI
|
|
* device for this zfcp_unit
|
|
*
|
|
* On success, the caller also holds a reference to the SCSI device
|
|
* that must be released with scsi_device_put.
|
|
*/
|
|
struct scsi_device *zfcp_unit_sdev(struct zfcp_unit *unit)
|
|
{
|
|
struct Scsi_Host *shost;
|
|
struct zfcp_port *port;
|
|
unsigned int lun;
|
|
|
|
lun = scsilun_to_int((struct scsi_lun *) &unit->fcp_lun);
|
|
port = unit->port;
|
|
shost = port->adapter->scsi_host;
|
|
return scsi_device_lookup(shost, 0, port->starget_id, lun);
|
|
}
|
|
|
|
/**
|
|
* zfcp_unit_sdev_status - Return zfcp LUN status for SCSI device
|
|
* @unit: The unit to lookup the SCSI device for
|
|
*
|
|
* Returns the zfcp LUN status field of the SCSI device if the SCSI device
|
|
* for the zfcp_unit exists, 0 otherwise.
|
|
*/
|
|
unsigned int zfcp_unit_sdev_status(struct zfcp_unit *unit)
|
|
{
|
|
unsigned int status = 0;
|
|
struct scsi_device *sdev;
|
|
struct zfcp_scsi_dev *zfcp_sdev;
|
|
|
|
sdev = zfcp_unit_sdev(unit);
|
|
if (sdev) {
|
|
zfcp_sdev = sdev_to_zfcp(sdev);
|
|
status = atomic_read(&zfcp_sdev->status);
|
|
scsi_device_put(sdev);
|
|
}
|
|
|
|
return status;
|
|
}
|
|
|
|
/**
|
|
* zfcp_unit_remove - Remove entry from list of configured units
|
|
* @port: The port where to remove the unit from the configuration
|
|
* @fcp_lun: The 64 bit LUN of the unit to remove
|
|
*
|
|
* Returns: -EINVAL if a unit with the specified LUN does not exist,
|
|
* 0 on success.
|
|
*/
|
|
int zfcp_unit_remove(struct zfcp_port *port, u64 fcp_lun)
|
|
{
|
|
struct zfcp_unit *unit;
|
|
struct scsi_device *sdev;
|
|
|
|
write_lock_irq(&port->unit_list_lock);
|
|
unit = _zfcp_unit_find(port, fcp_lun);
|
|
if (unit)
|
|
list_del(&unit->list);
|
|
write_unlock_irq(&port->unit_list_lock);
|
|
|
|
if (!unit)
|
|
return -EINVAL;
|
|
|
|
sdev = zfcp_unit_sdev(unit);
|
|
if (sdev) {
|
|
scsi_remove_device(sdev);
|
|
scsi_device_put(sdev);
|
|
}
|
|
|
|
put_device(&unit->dev);
|
|
|
|
zfcp_device_unregister(&unit->dev, &zfcp_sysfs_unit_attrs);
|
|
|
|
return 0;
|
|
}
|