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// SPDX-License-Identifier: GPL-2.0-or-later
#ifndef _LINUX_REF_TRACKER_H
#define _LINUX_REF_TRACKER_H
#include <linux/refcount.h>
#include <linux/types.h>
#include <linux/spinlock.h>
#include <linux/stackdepot.h>
#define __ostream_printf __printf(2, 3)
struct ref_tracker;
struct ref_tracker_dir {
#ifdef CONFIG_REF_TRACKER
spinlock_t lock;
unsigned int quarantine_avail;
refcount_t untracked;
refcount_t no_tracker;
bool dead;
struct list_head list; /* List of active trackers */
struct list_head quarantine; /* List of dead trackers */
const char *class; /* object classname */
#endif
};
#ifdef CONFIG_REF_TRACKER
#ifdef CONFIG_DEBUG_FS
void ref_tracker_dir_debugfs(struct ref_tracker_dir *dir);
void ref_tracker_dir_symlink(struct ref_tracker_dir *dir, const char *fmt, ...);
#else /* CONFIG_DEBUG_FS */
static inline void ref_tracker_dir_debugfs(struct ref_tracker_dir *dir)
{
}
static inline __ostream_printf
void ref_tracker_dir_symlink(struct ref_tracker_dir *dir, const char *fmt, ...)
{
}
#endif /* CONFIG_DEBUG_FS */
/**
* ref_tracker_dir_init - initialize a ref_tracker dir
* @dir: ref_tracker_dir to be initialized
* @quarantine_count: max number of entries to be tracked
* @class: pointer to static string that describes object type
*
* Initialize a ref_tracker_dir. If debugfs is configured, then a file
* will also be created for it under the top-level ref_tracker debugfs
* directory.
*
* Note that @class must point to a static string.
*/
static inline void ref_tracker_dir_init(struct ref_tracker_dir *dir,
unsigned int quarantine_count,
const char *class)
{
INIT_LIST_HEAD(&dir->list);
INIT_LIST_HEAD(&dir->quarantine);
spin_lock_init(&dir->lock);
dir->quarantine_avail = quarantine_count;
dir->dead = false;
refcount_set(&dir->untracked, 1);
refcount_set(&dir->no_tracker, 1);
dir->class = class;
ref_tracker_dir_debugfs(dir);
stack_depot_init();
}
void ref_tracker_dir_exit(struct ref_tracker_dir *dir);
void ref_tracker_dir_print_locked(struct ref_tracker_dir *dir,
unsigned int display_limit);
void ref_tracker_dir_print(struct ref_tracker_dir *dir,
unsigned int display_limit);
int ref_tracker_dir_snprint(struct ref_tracker_dir *dir, char *buf, size_t size);
int ref_tracker_alloc(struct ref_tracker_dir *dir,
struct ref_tracker **trackerp, gfp_t gfp);
int ref_tracker_free(struct ref_tracker_dir *dir,
struct ref_tracker **trackerp);
#else /* CONFIG_REF_TRACKER */
static inline void ref_tracker_dir_init(struct ref_tracker_dir *dir,
unsigned int quarantine_count,
const char *class)
{
}
static inline void ref_tracker_dir_debugfs(struct ref_tracker_dir *dir)
{
}
static inline __ostream_printf
void ref_tracker_dir_symlink(struct ref_tracker_dir *dir, const char *fmt, ...)
{
}
static inline void ref_tracker_dir_exit(struct ref_tracker_dir *dir)
{
}
static inline void ref_tracker_dir_print_locked(struct ref_tracker_dir *dir,
unsigned int display_limit)
{
}
static inline void ref_tracker_dir_print(struct ref_tracker_dir *dir,
unsigned int display_limit)
{
}
static inline int ref_tracker_dir_snprint(struct ref_tracker_dir *dir,
char *buf, size_t size)
{
return 0;
}
static inline int ref_tracker_alloc(struct ref_tracker_dir *dir,
struct ref_tracker **trackerp,
gfp_t gfp)
{
return 0;
}
static inline int ref_tracker_free(struct ref_tracker_dir *dir,
struct ref_tracker **trackerp)
{
return 0;
}
#endif
#endif /* _LINUX_REF_TRACKER_H */
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