Introduce md_cluster_operations to handle cluster functions
This allows dynamic registering of cluster hooks. Signed-off-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
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@ -13,6 +13,7 @@
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#include <linux/dlm.h>
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#include <linux/sched.h>
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#include "md.h"
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#include "md-cluster.h"
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#define LVB_SIZE 64
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@ -113,15 +114,32 @@ static void lockres_free(struct dlm_lock_resource *res)
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kfree(res);
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}
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static int join(struct mddev *mddev, int nodes)
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{
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return 0;
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}
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static int leave(struct mddev *mddev)
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{
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return 0;
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}
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static struct md_cluster_operations cluster_ops = {
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.join = join,
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.leave = leave,
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};
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static int __init cluster_init(void)
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{
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pr_warn("md-cluster: EXPERIMENTAL. Use with caution\n");
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pr_info("Registering Cluster MD functions\n");
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register_md_cluster_operations(&cluster_ops, THIS_MODULE);
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return 0;
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}
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static void cluster_exit(void)
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{
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unregister_md_cluster_operations();
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}
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module_init(cluster_init);
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@ -0,0 +1,15 @@
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#ifndef _MD_CLUSTER_H
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#define _MD_CLUSTER_H
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#include "md.h"
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struct mddev;
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struct md_cluster_operations {
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int (*join)(struct mddev *mddev);
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int (*leave)(struct mddev *mddev);
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};
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#endif /* _MD_CLUSTER_H */
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@ -53,6 +53,7 @@
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#include <linux/slab.h>
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#include "md.h"
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#include "bitmap.h"
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#include "md-cluster.h"
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#ifndef MODULE
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static void autostart_arrays(int part);
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@ -66,6 +67,10 @@ static void autostart_arrays(int part);
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static LIST_HEAD(pers_list);
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static DEFINE_SPINLOCK(pers_lock);
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struct md_cluster_operations *md_cluster_ops;
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struct module *md_cluster_mod;
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EXPORT_SYMBOL(md_cluster_mod);
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static DECLARE_WAIT_QUEUE_HEAD(resync_wait);
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static struct workqueue_struct *md_wq;
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static struct workqueue_struct *md_misc_wq;
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@ -7231,6 +7236,53 @@ int unregister_md_personality(struct md_personality *p)
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}
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EXPORT_SYMBOL(unregister_md_personality);
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int register_md_cluster_operations(struct md_cluster_operations *ops, struct module *module)
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{
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if (md_cluster_ops != NULL)
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return -EALREADY;
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spin_lock(&pers_lock);
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md_cluster_ops = ops;
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md_cluster_mod = module;
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spin_unlock(&pers_lock);
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return 0;
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}
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EXPORT_SYMBOL(register_md_cluster_operations);
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int unregister_md_cluster_operations(void)
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{
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spin_lock(&pers_lock);
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md_cluster_ops = NULL;
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spin_unlock(&pers_lock);
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return 0;
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}
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EXPORT_SYMBOL(unregister_md_cluster_operations);
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int md_setup_cluster(struct mddev *mddev, int nodes)
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{
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int err;
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err = request_module("md-cluster");
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if (err) {
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pr_err("md-cluster module not found.\n");
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return err;
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}
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spin_lock(&pers_lock);
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if (!md_cluster_ops || !try_module_get(md_cluster_mod)) {
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spin_unlock(&pers_lock);
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return -ENOENT;
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}
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spin_unlock(&pers_lock);
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return md_cluster_ops->join(mddev);
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}
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void md_cluster_stop(struct mddev *mddev)
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{
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md_cluster_ops->leave(mddev);
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module_put(md_cluster_mod);
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}
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static int is_mddev_idle(struct mddev *mddev, int init)
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{
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struct md_rdev *rdev;
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@ -23,6 +23,7 @@
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#include <linux/timer.h>
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#include <linux/wait.h>
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#include <linux/workqueue.h>
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#include "md-cluster.h"
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#define MaxSector (~(sector_t)0)
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@ -608,6 +609,11 @@ static inline void safe_put_page(struct page *p)
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extern int register_md_personality(struct md_personality *p);
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extern int unregister_md_personality(struct md_personality *p);
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extern int register_md_cluster_operations(struct md_cluster_operations *ops,
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struct module *module);
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extern int unregister_md_cluster_operations(void);
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extern int md_setup_cluster(struct mddev *mddev, int nodes);
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extern void md_cluster_stop(struct mddev *mddev);
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extern struct md_thread *md_register_thread(
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void (*run)(struct md_thread *thread),
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struct mddev *mddev,
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@ -669,4 +675,5 @@ static inline void rdev_dec_pending(struct md_rdev *rdev, struct mddev *mddev)
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}
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}
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extern struct md_cluster_operations *md_cluster_ops;
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#endif /* _MD_MD_H */
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