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bcachefs: Fix RCU splat

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Reported-by: syzbot+e74fea078710bbca6f4b@syzkaller.appspotmail.com
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2024-07-09 16:43:01 -04:00
parent 7d7f71cd87
commit 6f692b1672
2 changed files with 9 additions and 1 deletions
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2
fs/bcachefs/buckets.c
View File

@ -805,7 +805,7 @@ int bch2_bucket_ref_update(struct btree_trans *trans, struct bch_dev *ca,
"bucket %u:%zu gen %u (mem gen %u) data type %s: stale dirty ptr (gen %u)\n"
"while marking %s",
ptr->dev, bucket_nr, b_gen,
*bucket_gen(ca, bucket_nr),
bucket_gen_get(ca, bucket_nr),
bch2_data_type_str(bucket_data_type ?: ptr_data_type),
ptr->gen,
(printbuf_reset(&buf),

8
fs/bcachefs/buckets.h
View File

@ -116,6 +116,14 @@ static inline u8 *bucket_gen(struct bch_dev *ca, size_t b)
return gens->b + b;
}
static inline u8 bucket_gen_get(struct bch_dev *ca, size_t b)
{
rcu_read_lock();
u8 gen = *bucket_gen(ca, b);
rcu_read_unlock();
return gen;
}
static inline size_t PTR_BUCKET_NR(const struct bch_dev *ca,
const struct bch_extent_ptr *ptr)
{