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bcachefs: Allow for unknown key types in backpointers fsck

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We can't assume that btrees only contain keys of a given type - even if
they only have a single key type listed in the allowed key types for
that btree; this is a forwards compatibility issue.

Reported-by: syzbot+a27c3aaa3640dd3e1dfb@syzkaller.appspotmail.com
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2024-11-10 23:28:33 -05:00
parent 0b6ec0c5ac
commit 2642084f26
1 changed files with 6 additions and 4 deletions
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10
fs/bcachefs/backpointers.c
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@ -952,9 +952,13 @@ int bch2_check_extents_to_backpointers(struct bch_fs *c)
static int check_one_backpointer(struct btree_trans *trans,
struct bbpos start,
struct bbpos end,
struct bkey_s_c_backpointer bp,
struct bkey_s_c bp_k,
struct bkey_buf *last_flushed)
{
if (bp_k.k->type != KEY_TYPE_backpointer)
return 0;
struct bkey_s_c_backpointer bp = bkey_s_c_to_backpointer(bp_k);
struct bch_fs *c = trans->c;
struct btree_iter iter;
struct bbpos pos = bp_to_bbpos(*bp.v);
@ -1009,9 +1013,7 @@ static int bch2_check_backpointers_to_extents_pass(struct btree_trans *trans,
POS_MIN, BTREE_ITER_prefetch, k,
NULL, NULL, BCH_TRANS_COMMIT_no_enospc, ({
progress_update_iter(trans, &progress, &iter, "backpointers_to_extents");
check_one_backpointer(trans, start, end,
bkey_s_c_to_backpointer(k),
&last_flushed);
check_one_backpointer(trans, start, end, k, &last_flushed);
}));
bch2_bkey_buf_exit(&last_flushed, c);