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bcachefs: Handle backpointers with unknown data types

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New data types might be added later, so we don't want to disallow
unknown data types - that'll be a compatibility hassle later. Instead,
ignore them.

Reported-by: syzbot+3a290f5ff67ca3023834@syzkaller.appspotmail.com
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2025-03-19 17:01:38 -04:00
parent 6a9f681ef6
commit 962322475b
1 changed files with 7 additions and 3 deletions
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10
fs/bcachefs/backpointers.c
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@ -784,7 +784,7 @@ enum alloc_sector_counter {
ALLOC_SECTORS_NR
};
static enum alloc_sector_counter data_type_to_alloc_counter(enum bch_data_type t)
static int data_type_to_alloc_counter(enum bch_data_type t)
{
switch (t) {
case BCH_DATA_btree:
@ -796,7 +796,7 @@ static enum alloc_sector_counter data_type_to_alloc_counter(enum bch_data_type t
case BCH_DATA_parity:
return ALLOC_stripe;
default:
BUG();
return -1;
}
}
@ -847,7 +847,11 @@ static int check_bucket_backpointer_mismatch(struct btree_trans *trans, struct b
if (bp.v->bucket_gen != a->gen)
continue;
sectors[data_type_to_alloc_counter(bp.v->data_type)] += bp.v->bucket_len;
int alloc_counter = data_type_to_alloc_counter(bp.v->data_type);
if (alloc_counter < 0)
continue;
sectors[alloc_counter] += bp.v->bucket_len;
};
bch2_trans_iter_exit(trans, &iter);
if (ret)