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bcachefs: Fix should_invalidate_buckets()

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Like bch2_copygc_wait_amount, should_invalidate_buckets() needs to try
to ensure that there are always more buckets free than the largest
reserve.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
This commit is contained in:
Kent Overstreet 2022-07-17 22:59:01 -04:00 committed by Kent Overstreet
parent 175379db20
commit b962552eab
1 changed files with 6 additions and 4 deletions
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10
fs/bcachefs/alloc_background.h
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@ -134,11 +134,13 @@ void bch2_do_discards(struct bch_fs *);
static inline u64 should_invalidate_buckets(struct bch_dev *ca,
struct bch_dev_usage u)
{
u64 free = u.d[BCH_DATA_free].buckets +
u.d[BCH_DATA_need_discard].buckets;
u64 want_free = ca->mi.nbuckets >> 7;
u64 free = max_t(s64, 0,
u.d[BCH_DATA_free].buckets
+ u.d[BCH_DATA_need_discard].buckets
- bch2_dev_buckets_reserved(ca, RESERVE_none));
return clamp_t(s64, (ca->mi.nbuckets >> 7) - free,
0, u.d[BCH_DATA_cached].buckets);
return clamp_t(s64, want_free - free, 0, u.d[BCH_DATA_cached].buckets);
}
void bch2_do_invalidates(struct bch_fs *);