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[SCSI] libfc: add hook to notify providers of local port changes

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When an SCST provider is registered, it needs to know what
local ports are available for configuration as targets.

Add a notifier chain that is invoked when any local port
that is added or deleted.

Maintain a global list of local ports and add an
interator function that calls a given function for
every existing local port.  This is used when first
loading a provider.

Signed-off-by: Joe Eykholt <jeykholt@cisco.com>
Signed-off-by: Robert Love <robert.w.love@intel.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
This commit is contained in:
Joe Eykholt
2011-01-28 16:04:18 -08:00
committed by James Bottomley
parent baf9fdf076
commit 70d53b046a
4 changed files with 58 additions and 1 deletions
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41
drivers/scsi/libfc/fc_libfc.c
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@@ -36,6 +36,10 @@ module_param_named(debug_logging, fc_debug_logging, int, S_IRUGO|S_IWUSR);
MODULE_PARM_DESC(debug_logging, "a bit mask of logging levels");
DEFINE_MUTEX(fc_prov_mutex);
static LIST_HEAD(fc_local_ports);
struct blocking_notifier_head fc_lport_notifier_head =
BLOCKING_NOTIFIER_INIT(fc_lport_notifier_head);
EXPORT_SYMBOL(fc_lport_notifier_head);
/*
* Providers which primarily send requests and PRLIs.
@@ -228,6 +232,17 @@ void fc_fill_reply_hdr(struct fc_frame *fp, const struct fc_frame *in_fp,
}
EXPORT_SYMBOL(fc_fill_reply_hdr);
void fc_lport_iterate(void (*notify)(struct fc_lport *, void *), void *arg)
{
struct fc_lport *lport;
mutex_lock(&fc_prov_mutex);
list_for_each_entry(lport, &fc_local_ports, lport_list)
notify(lport, arg);
mutex_unlock(&fc_prov_mutex);
}
EXPORT_SYMBOL(fc_lport_iterate);
/**
* fc_fc4_register_provider() - register FC-4 upper-level provider.
* @type: FC-4 type, such as FC_TYPE_FCP
@@ -270,3 +285,29 @@ void fc_fc4_deregister_provider(enum fc_fh_type type, struct fc4_prov *prov)
synchronize_rcu();
}
EXPORT_SYMBOL(fc_fc4_deregister_provider);
/**
* fc_fc4_add_lport() - add new local port to list and run notifiers.
* @lport: The new local port.
*/
void fc_fc4_add_lport(struct fc_lport *lport)
{
mutex_lock(&fc_prov_mutex);
list_add_tail(&lport->lport_list, &fc_local_ports);
blocking_notifier_call_chain(&fc_lport_notifier_head,
FC_LPORT_EV_ADD, lport);
mutex_unlock(&fc_prov_mutex);
}
/**
* fc_fc4_del_lport() - remove local port from list and run notifiers.
* @lport: The new local port.
*/
void fc_fc4_del_lport(struct fc_lport *lport)
{
mutex_lock(&fc_prov_mutex);
list_del(&lport->lport_list);
blocking_notifier_call_chain(&fc_lport_notifier_head,
FC_LPORT_EV_DEL, lport);
mutex_unlock(&fc_prov_mutex);
}