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bcachefs: Advance bch_alloc.oldest_gen if no stale pointers

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Now that we've got cached backpointers and aren't leaving around stale
pointers on bucket invalidation, we no longer need the periodic (rare)
gc_gens - which recalculates each bucket's oldest gen to avoid wraparound.

We can't delete that code because we've got to support existing
filesystems that will still have stale pointers, but this gets rid of
another scalability limit.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2025-02-07 19:56:11 -05:00
parent 942a418c7a
commit 69bd8a9277
1 changed files with 3 additions and 0 deletions
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3
fs/bcachefs/alloc_background.c
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@ -871,6 +871,9 @@ int bch2_trigger_alloc(struct btree_trans *trans,
if (data_type_is_empty(new_a->data_type) &&
BCH_ALLOC_V4_NEED_INC_GEN(new_a) &&
!bch2_bucket_is_open_safe(c, new.k->p.inode, new.k->p.offset)) {
if (new_a->oldest_gen == new_a->gen &&
!bch2_bucket_sectors_total(*new_a))
new_a->oldest_gen++;
new_a->gen++;
SET_BCH_ALLOC_V4_NEED_INC_GEN(new_a, false);
alloc_data_type_set(new_a, new_a->data_type);