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Commit edb39c9d authored by Goldwyn Rodrigues's avatar Goldwyn Rodrigues
Browse files

Introduce md_cluster_operations to handle cluster functions 



This allows dynamic registering of cluster hooks.

Signed-off-by: default avatarGoldwyn Rodrigues <rgoldwyn@suse.com>
parent 47741b7c

drivers/md/md-cluster.c

+18 −0
Original line number Diff line number Diff line
@@ -13,6 +13,7 @@ 
#include <linux/dlm.h>

#include <linux/sched.h>

#include "md.h"

#include "md-cluster.h"



#define LVB_SIZE	64
@@ -113,15 +114,32 @@ static void lockres_free(struct dlm_lock_resource *res) 
	kfree(res);

}



static int join(struct mddev *mddev, int nodes)

{

	return 0;

}



static int leave(struct mddev *mddev)

{

	return 0;

}



static struct md_cluster_operations cluster_ops = {

	.join   = join,

	.leave  = leave,

};



static int __init cluster_init(void)

{

	pr_warn("md-cluster: EXPERIMENTAL. Use with caution\n");

	pr_info("Registering Cluster MD functions\n");

	register_md_cluster_operations(&cluster_ops, THIS_MODULE);

	return 0;

}



static void cluster_exit(void)

{

	unregister_md_cluster_operations();

}



module_init(cluster_init);

drivers/md/md-cluster.h

0 → 100644
+15 −0
Original line number Diff line number Diff line 




#ifndef _MD_CLUSTER_H

#define _MD_CLUSTER_H



#include "md.h"



struct mddev;



struct md_cluster_operations {

	int (*join)(struct mddev *mddev);

	int (*leave)(struct mddev *mddev);

};



#endif /* _MD_CLUSTER_H */

drivers/md/md.c

+52 −0
Original line number Diff line number Diff line
@@ -53,6 +53,7 @@ 
#include <linux/slab.h>

#include "md.h"

#include "bitmap.h"

#include "md-cluster.h"



#ifndef MODULE

static void autostart_arrays(int part);
@@ -66,6 +67,10 @@ static void autostart_arrays(int part); 
static LIST_HEAD(pers_list);

static DEFINE_SPINLOCK(pers_lock);



struct md_cluster_operations *md_cluster_ops;

struct module *md_cluster_mod;

EXPORT_SYMBOL(md_cluster_mod);



static DECLARE_WAIT_QUEUE_HEAD(resync_wait);

static struct workqueue_struct *md_wq;

static struct workqueue_struct *md_misc_wq;
@@ -7231,6 +7236,53 @@ int unregister_md_personality(struct md_personality *p) 
}

EXPORT_SYMBOL(unregister_md_personality);



int register_md_cluster_operations(struct md_cluster_operations *ops, struct module *module)

{

	if (md_cluster_ops != NULL)

		return -EALREADY;

	spin_lock(&pers_lock);

	md_cluster_ops = ops;

	md_cluster_mod = module;

	spin_unlock(&pers_lock);

	return 0;

}

EXPORT_SYMBOL(register_md_cluster_operations);



int unregister_md_cluster_operations(void)

{

	spin_lock(&pers_lock);

	md_cluster_ops = NULL;

	spin_unlock(&pers_lock);

	return 0;

}

EXPORT_SYMBOL(unregister_md_cluster_operations);



int md_setup_cluster(struct mddev *mddev, int nodes)

{

	int err;



	err = request_module("md-cluster");

	if (err) {

		pr_err("md-cluster module not found.\n");

		return err;

	}



	spin_lock(&pers_lock);

	if (!md_cluster_ops || !try_module_get(md_cluster_mod)) {

		spin_unlock(&pers_lock);

		return -ENOENT;

	}

	spin_unlock(&pers_lock);



	return md_cluster_ops->join(mddev);

}



void md_cluster_stop(struct mddev *mddev)

{

	md_cluster_ops->leave(mddev);

	module_put(md_cluster_mod);

}



static int is_mddev_idle(struct mddev *mddev, int init)

{

	struct md_rdev *rdev;

drivers/md/md.h

+7 −0
Original line number Diff line number Diff line
@@ -23,6 +23,7 @@ 
#include <linux/timer.h>

#include <linux/wait.h>

#include <linux/workqueue.h>

#include "md-cluster.h"



#define MaxSector (~(sector_t)0)
@@ -608,6 +609,11 @@ static inline void safe_put_page(struct page *p) 


extern int register_md_personality(struct md_personality *p);

extern int unregister_md_personality(struct md_personality *p);

extern int register_md_cluster_operations(struct md_cluster_operations *ops,

		struct module *module);

extern int unregister_md_cluster_operations(void);

extern int md_setup_cluster(struct mddev *mddev, int nodes);

extern void md_cluster_stop(struct mddev *mddev);

extern struct md_thread *md_register_thread(

	void (*run)(struct md_thread *thread),

	struct mddev *mddev,
@@ -669,4 +675,5 @@ static inline void rdev_dec_pending(struct md_rdev *rdev, struct mddev *mddev) 
	}

}



extern struct md_cluster_operations *md_cluster_ops;

#endif /* _MD_MD_H */