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