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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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include/scsi/libfc.h
+13 -1
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@@ -763,6 +763,15 @@ struct fc_disc {
enum fc_disc_event);
};
/*
* Local port notifier and events.
*/
extern struct blocking_notifier_head fc_lport_notifier_head;
enum fc_lport_event {
FC_LPORT_EV_ADD,
FC_LPORT_EV_DEL,
};
/**
* struct fc_lport - Local port
* @host: The SCSI host associated with a local port
@@ -803,9 +812,10 @@ struct fc_disc {
* @lso_max: The maximum large offload send size
* @fcts: FC-4 type mask
* @lp_mutex: Mutex to protect the local port
* @list: Handle for list of local ports
* @list: Linkage on list of vport peers
* @retry_work: Handle to local port for delayed retry context
* @prov: Pointers available for use by passive FC-4 providers
* @lport_list: Linkage on module-wide list of local ports
*/
struct fc_lport {
/* Associations */
@@ -862,6 +872,7 @@ struct fc_lport {
struct list_head list;
struct delayed_work retry_work;
void *prov[FC_FC4_PROV_SIZE];
struct list_head lport_list;
};
/**
@@ -1016,6 +1027,7 @@ struct fc_lport *libfc_vport_create(struct fc_vport *, int privsize);
struct fc_lport *fc_vport_id_lookup(struct fc_lport *, u32 port_id);
int fc_lport_bsg_request(struct fc_bsg_job *);
void fc_lport_set_local_id(struct fc_lport *, u32 port_id);
void fc_lport_iterate(void (*func)(struct fc_lport *, void *), void *);
/*
* REMOTE PORT LAYER