/* SPDX-License-Identifier: GPL-2.0 */ #ifndef DM_STATS_H #define DM_STATS_H #include <linux/types.h> #include <linux/mutex.h> #include <linux/list.h> int dm_statistics_init(void); void dm_statistics_exit(void); struct dm_stats { struct mutex mutex; struct list_head list; /* list of struct dm_stat */ struct dm_stats_last_position __percpu *last; sector_t last_sector; unsigned last_rw; }; struct dm_stats_aux { bool merged; unsigned long long duration_ns; }; void dm_stats_init(struct dm_stats *st); void dm_stats_cleanup(struct dm_stats *st); struct mapped_device; int dm_stats_message(struct mapped_device *md, unsigned argc, char **argv, char *result, unsigned maxlen); void dm_stats_account_io(struct dm_stats *stats, unsigned long bi_rw, sector_t bi_sector, unsigned bi_sectors, bool end, unsigned long duration_jiffies, struct dm_stats_aux *aux); static inline bool dm_stats_used(struct dm_stats *st) { return !list_empty(&st->list); } #endif