Commit d3beb7c9 authored by Yu Kuai's avatar Yu Kuai Committed by Yu Kuai
Browse files

md: introduce struct md_submodule_head and APIs 

Prepare to unify registration and unregistration of md personalities
and md-cluster, also prepare for add kconfig for md-bitmap.

Link: https://lore.kernel.org/linux-raid/20250215092225.2427977-4-yukuai1@huaweicloud.com


Signed-off-by: default avatarYu Kuai <yukuai3@huawei.com>
parent bf0a7326

drivers/md/md-cluster.h

+2 −0
Original line number Diff line number Diff line
@@ -10,6 +10,8 @@ struct mddev; 
struct md_rdev;



struct md_cluster_operations {

	struct md_submodule_head head;



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

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

	int (*slot_number)(struct mddev *mddev);

drivers/md/md.c

+14 −0
Original line number Diff line number Diff line
@@ -79,6 +79,8 @@ static const char *action_name[NR_SYNC_ACTIONS] = { 
	[ACTION_IDLE]		= "idle",

};



static DEFINE_XARRAY(md_submodule);



/* pers_list is a list of registered personalities protected by pers_lock. */

static LIST_HEAD(pers_list);

static DEFINE_SPINLOCK(pers_lock);
@@ -8522,6 +8524,18 @@ static const struct proc_ops mdstat_proc_ops = { 
	.proc_poll	= mdstat_poll,

};



int register_md_submodule(struct md_submodule_head *msh)

{

	return xa_insert(&md_submodule, msh->id, msh, GFP_KERNEL);

}

EXPORT_SYMBOL_GPL(register_md_submodule);



void unregister_md_submodule(struct md_submodule_head *msh)

{

	xa_erase(&md_submodule, msh->id);

}

EXPORT_SYMBOL_GPL(unregister_md_submodule);



int register_md_personality(struct md_personality *p)

{

	pr_debug("md: %s personality registered for level %d\n",

drivers/md/md.h

+31 −0
Original line number Diff line number Diff line
@@ -18,10 +18,37 @@ 
#include <linux/timer.h>

#include <linux/wait.h>

#include <linux/workqueue.h>

#include <linux/raid/md_u.h>

#include <trace/events/block.h>



#define MaxSector (~(sector_t)0)



enum md_submodule_type {

	MD_PERSONALITY = 0,

	MD_CLUSTER,

	MD_BITMAP, /* TODO */

};



enum md_submodule_id {

	ID_LINEAR	= LEVEL_LINEAR,

	ID_RAID0	= 0,

	ID_RAID1	= 1,

	ID_RAID4	= 4,

	ID_RAID5	= 5,

	ID_RAID6	= 6,

	ID_RAID10	= 10,

	ID_CLUSTER,

	ID_BITMAP,	/* TODO */

	ID_LLBITMAP,	/* TODO */

};



struct md_submodule_head {

	enum md_submodule_type	type;

	enum md_submodule_id	id;

	const char		*name;

	struct module		*owner;

};



/*

 * These flags should really be called "NO_RETRY" rather than

 * "FAILFAST" because they don't make any promise about time lapse,
@@ -698,6 +725,7 @@ static inline void md_sync_acct_bio(struct bio *bio, unsigned long nr_sectors) 


struct md_personality

{

	struct md_submodule_head head;

	char *name;

	int level;

	struct list_head list;
@@ -842,6 +870,9 @@ static inline void safe_put_page(struct page *p) 
	if (p) put_page(p);

}



int register_md_submodule(struct md_submodule_head *msh);

void unregister_md_submodule(struct md_submodule_head *msh);



extern int register_md_personality(struct md_personality *p);

extern int unregister_md_personality(struct md_personality *p);

extern struct md_thread *md_register_thread(