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#ifndef _BCACHE_MOVINGGC_H
#define _BCACHE_MOVINGGC_H
/*
* We can't use the entire copygc reserve in one iteration of copygc: we may
* need the buckets we're freeing up to go back into the copygc reserve to make
* forward progress, but if the copygc reserve is full they'll be available for
* any allocation - and it's possible that in a given iteration, we free up most
* of the buckets we're going to free before we allocate most of the buckets
* we're going to allocate.
*
* If we only use half of the reserve per iteration, then in steady state we'll
* always have room in the reserve for the buckets we're going to need in the
* next iteration:
*/
#define COPYGC_BUCKETS_PER_ITER(ca) \
((ca)->free[RESERVE_MOVINGGC].size / 2)
/*
* Max sectors to move per iteration: Have to take into account internal
* fragmentation from the multiple write points for each generation:
*/
#define COPYGC_SECTORS_PER_ITER(ca) \
((ca)->mi.bucket_size * COPYGC_BUCKETS_PER_ITER(ca))
void bch_moving_gc_stop(struct cache *);
int bch_moving_gc_start(struct cache *);
void bch_dev_moving_gc_init(struct cache *);
#endif
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