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/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_SHRINKER_LUSTRE_H
#define _LINUX_SHRINKER_LUSTRE_H

#include <linux/atomic.h>
#include <linux/mm.h>
#include <linux/shrinker.h>
#include <linux/types.h>

#if !defined(CONFIG_SHRINKER_DEBUG) || defined(HAVE_REGISTER_SHRINKER_FORMAT_NAMED)
struct ll_shrinker {
	struct shrinker ll_shrinker;

  #ifndef CONFIG_SHRINKER_DEBUG
	int debugfs_id;
	const char *name;
	struct dentry *debugfs_entry;
  #endif
  #ifdef HAVE_REGISTER_SHRINKER_FORMAT_NAMED
	struct va_format vaf;
  #endif
};
#else
#define ll_shrinker	shrinker
#endif

#if !defined(CONFIG_SHRINKER_DEBUG)
void shrinker_debugfs_fini(void);
int shrinker_debugfs_init(void);
#else

static inline void shrinker_debugfs_fini(void) {};
static inline int shrinker_debugfs_init(void) { return 0; };
#endif

struct shrinker *ll_shrinker_alloc(unsigned int flags,
				   const char *fmt, ...);
void ll_shrinker_register(struct shrinker *shrinker);
void ll_shrinker_free(struct shrinker *shrinker);

static inline const char *shrinker_debugfs_path(struct shrinker *shrinker)
{
#ifndef CONFIG_SHRINKER_DEBUG
 #ifndef HAVE_SHRINKER_ALLOC
	struct ll_shrinker *s = container_of(shrinker, struct ll_shrinker,
					     ll_shrinker);
 #else
	struct ll_shrinker *s = shrinker->private_data;
 #endif
#else /* !CONFIG_SHRINKER_DEBUG */
	struct shrinker *s = shrinker;
#endif /* CONFIG_SHRINKER_DEBUG */

	return s->debugfs_entry->d_name.name;
}

#endif /* _LINUX_SHRINKER_LUSTRE_H */