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bcachefs: Fix ca->oldest_gen allocation

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The ca->oldest_gen array needs to be the same size as the bucket_gens
array; ca->mi.nbuckets is updated with only state_lock held, not
gc_lock, so bch2_gc_gens() could race with device resize and allocate
too small of an oldest_gens array.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2023-10-20 12:24:36 -04:00
parent a1d97d8417
commit 253ba178c8
1 changed files with 2 additions and 4 deletions
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6
fs/bcachefs/btree_gc.c
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@ -1954,19 +1954,17 @@ int bch2_gc_gens(struct bch_fs *c)
trans = bch2_trans_get(c);
for_each_member_device(ca, c, i) {
struct bucket_gens *gens;
struct bucket_gens *gens = bucket_gens(ca);
BUG_ON(ca->oldest_gen);
ca->oldest_gen = kvmalloc(ca->mi.nbuckets, GFP_KERNEL);
ca->oldest_gen = kvmalloc(gens->nbuckets, GFP_KERNEL);
if (!ca->oldest_gen) {
percpu_ref_put(&ca->ref);
ret = -BCH_ERR_ENOMEM_gc_gens;
goto err;
}
gens = bucket_gens(ca);
for (b = gens->first_bucket;
b < gens->nbuckets; b++)
ca->oldest_gen[b] = gens->b[b];