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[SCSI] iscsi: add iscsi host helpers

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This finishes the host/session unbinding, by adding some helpers
to add and remove hosts and the session they manage.

Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Mike Christie
2008-05-21 15:54:00 -05:00
committed by James Bottomley
parent 756135215e
commit a4804cd6eb
6 changed files with 99 additions and 31 deletions
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60
drivers/scsi/libiscsi.c
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@@ -1764,8 +1764,39 @@ void iscsi_pool_free(struct iscsi_pool *q)
}
EXPORT_SYMBOL_GPL(iscsi_pool_free);
void iscsi_host_setup(struct Scsi_Host *shost, uint16_t qdepth)
/**
* iscsi_host_add - add host to system
* @shost: scsi host
* @pdev: parent device
*
* This should be called by partial offload and software iscsi drivers
* to add a host to the system.
*/
int iscsi_host_add(struct Scsi_Host *shost, struct device *pdev)
{
return scsi_add_host(shost, pdev);
}
EXPORT_SYMBOL_GPL(iscsi_host_add);
/**
* iscsi_host_alloc - allocate a host and driver data
* @sht: scsi host template
* @dd_data_size: driver host data size
* @qdepth: default device queue depth
*
* This should be called by partial offload and software iscsi drivers.
* To access the driver specific memory use the iscsi_host_priv() macro.
*/
struct Scsi_Host *iscsi_host_alloc(struct scsi_host_template *sht,
int dd_data_size, uint16_t qdepth)
{
struct Scsi_Host *shost;
shost = scsi_host_alloc(sht, sizeof(struct iscsi_host) + dd_data_size);
if (!shost)
return NULL;
shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out;
if (qdepth > ISCSI_MAX_CMD_PER_LUN || qdepth < 1) {
if (qdepth != 0)
printk(KERN_ERR "iscsi: invalid queue depth of %d. "
@@ -1773,22 +1804,37 @@ void iscsi_host_setup(struct Scsi_Host *shost, uint16_t qdepth)
qdepth, ISCSI_MAX_CMD_PER_LUN);
qdepth = ISCSI_DEF_CMD_PER_LUN;
}
shost->transportt->create_work_queue = 1;
shost->transportt->eh_timed_out = iscsi_eh_cmd_timed_out;
shost->cmd_per_lun = qdepth;
return shost;
}
EXPORT_SYMBOL_GPL(iscsi_host_setup);
EXPORT_SYMBOL_GPL(iscsi_host_alloc);
void iscsi_host_teardown(struct Scsi_Host *shost)
/**
* iscsi_host_remove - remove host and sessions
* @shost: scsi host
*
* This will also remove any sessions attached to the host, but if userspace
* is managing the session at the same time this will break. TODO: add
* refcounting to the netlink iscsi interface so a rmmod or host hot unplug
* does not remove the memory from under us.
*/
void iscsi_host_remove(struct Scsi_Host *shost)
{
iscsi_host_for_each_session(shost, iscsi_session_teardown);
scsi_remove_host(shost);
}
EXPORT_SYMBOL_GPL(iscsi_host_remove);
void iscsi_host_free(struct Scsi_Host *shost)
{
struct iscsi_host *ihost = shost_priv(shost);
kfree(ihost->netdev);
kfree(ihost->hwaddress);
kfree(ihost->initiatorname);
scsi_host_put(shost);
}
EXPORT_SYMBOL_GPL(iscsi_host_teardown);
EXPORT_SYMBOL_GPL(iscsi_host_free);
/**
* iscsi_session_setup - create iscsi cls session and host and session