mm: Don't pin ZERO_PAGE in pin_user_pages()

[linux-block.git] / include / linux / raid_class.h

/* SPDX-License-Identifier: GPL-2.0-only */
/*
 * raid_class.h - a generic raid visualisation class
 *
 * Copyright (c) 2005 - James Bottomley <James.Bottomley@steeleye.com>
 */
#include <linux/transport_class.h>

struct raid_template {
	struct transport_container raid_attrs;
};

struct raid_function_template {
	const void *cookie;
	int (*is_raid)(struct device *);
	void (*get_resync)(struct device *);
	void (*get_state)(struct device *);
};

enum raid_state {
	RAID_STATE_UNKNOWN = 0,
	RAID_STATE_ACTIVE,
	RAID_STATE_DEGRADED,
	RAID_STATE_RESYNCING,
	RAID_STATE_OFFLINE,
};

enum raid_level {
	RAID_LEVEL_UNKNOWN = 0,
	RAID_LEVEL_LINEAR,
	RAID_LEVEL_0,
	RAID_LEVEL_1,
	RAID_LEVEL_10,
	RAID_LEVEL_1E,
	RAID_LEVEL_3,
	RAID_LEVEL_4,
	RAID_LEVEL_5,
	RAID_LEVEL_50,
	RAID_LEVEL_6,
	RAID_LEVEL_JBOD,
};

struct raid_data {
	struct list_head component_list;
	int component_count;
	enum raid_level level;
	enum raid_state state;
	int resync;
};

/* resync complete goes from 0 to this */
#define RAID_MAX_RESYNC		(10000)

#define DEFINE_RAID_ATTRIBUTE(type, attr)				      \
static inline void							      \
raid_set_##attr(struct raid_template *r, struct device *dev, type value) {    \
	struct device *device =						      \
		attribute_container_find_class_device(&r->raid_attrs.ac, dev);\
	struct raid_data *rd;						      \
	BUG_ON(!device);						      \
	rd = dev_get_drvdata(device);					      \
	rd->attr = value;						      \
}									      \
static inline type							      \
raid_get_##attr(struct raid_template *r, struct device *dev) {		      \
	struct device *device =						      \
		attribute_container_find_class_device(&r->raid_attrs.ac, dev);\
	struct raid_data *rd;						      \
	BUG_ON(!device);						      \
	rd = dev_get_drvdata(device);					      \
	return rd->attr;						      \
}

DEFINE_RAID_ATTRIBUTE(enum raid_level, level)
DEFINE_RAID_ATTRIBUTE(int, resync)
DEFINE_RAID_ATTRIBUTE(enum raid_state, state)
	
struct raid_template *raid_class_attach(struct raid_function_template *);
void raid_class_release(struct raid_template *);

int __must_check raid_component_add(struct raid_template *, struct device *,
				    struct device *);