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bcachefs: Fix bch2_check_discard_freespace_key()

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We weren't correctly checking the freespace btree - it's an extents
btree, which means we need to iterate over each bucket in a freespace
extent.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2023-06-18 13:25:35 -04:00
parent 25aa8c2167
commit e96f5a61cb
1 changed files with 35 additions and 12 deletions
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47
fs/bcachefs/alloc_background.c
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@ -788,10 +788,12 @@ static int bch2_bucket_do_index(struct btree_trans *trans,
if (ca->mi.freespace_initialized &&
test_bit(BCH_FS_CHECK_ALLOC_DONE, &c->flags) &&
bch2_trans_inconsistent_on(old.k->type != old_type, trans,
"incorrect key when %s %s btree (got %s should be %s)\n"
"incorrect key when %s %s:%llu:%llu:0 (got %s should be %s)\n"
" for %s",
set ? "setting" : "clearing",
bch2_btree_ids[btree],
iter.pos.inode,
iter.pos.offset,
bch2_bkey_types[old.k->type],
bch2_bkey_types[old_type],
(bch2_bkey_val_to_text(&buf, c, alloc_k), buf.buf))) {
@ -1278,8 +1280,8 @@ static int bch2_check_alloc_hole_bucket_gens(struct btree_trans *trans,
return ret;
}
static int bch2_check_discard_freespace_key(struct btree_trans *trans,
struct btree_iter *iter)
static int __bch2_check_discard_freespace_key(struct btree_trans *trans,
struct btree_iter *iter)
{
struct bch_fs *c = trans->c;
struct btree_iter alloc_iter;
@ -1313,23 +1315,46 @@ static int bch2_check_discard_freespace_key(struct btree_trans *trans,
if (fsck_err_on(a->data_type != state ||
(state == BCH_DATA_free &&
genbits != alloc_freespace_genbits(*a)), c,
"%s\n incorrectly set in %s index (free %u, genbits %llu should be %llu)",
"%s\n incorrectly set at %s:%llu:%llu:0 (free %u, genbits %llu should be %llu)",
(bch2_bkey_val_to_text(&buf, c, alloc_k), buf.buf),
bch2_btree_ids[iter->btree_id],
iter->pos.inode,
iter->pos.offset,
a->data_type == state,
genbits >> 56, alloc_freespace_genbits(*a) >> 56))
goto delete;
out:
fsck_err:
set_btree_iter_dontneed(&alloc_iter);
bch2_trans_iter_exit(trans, &alloc_iter);
printbuf_exit(&buf);
return ret;
delete:
ret = bch2_btree_delete_extent_at(trans, iter,
iter->btree_id == BTREE_ID_freespace ? 1 : 0, 0);
ret = bch2_btree_delete_extent_at(trans, iter,
iter->btree_id == BTREE_ID_freespace ? 1 : 0, 0) ?:
bch2_trans_commit(trans, NULL, NULL,
BTREE_INSERT_NOFAIL|BTREE_INSERT_LAZY_RW);
goto out;
}
static int bch2_check_discard_freespace_key(struct btree_trans *trans,
struct btree_iter *iter,
struct bpos end)
{
if (!btree_node_type_is_extents(iter->btree_id)) {
return __bch2_check_discard_freespace_key(trans, iter);
} else {
int ret = 0;
while (!bkey_eq(iter->pos, end) &&
!(ret = btree_trans_too_many_iters(trans) ?:
__bch2_check_discard_freespace_key(trans, iter)))
bch2_btree_iter_set_pos(iter, bpos_nosnap_successor(iter->pos));
return ret;
}
}
/*
* We've already checked that generation numbers in the bucket_gens btree are
* valid for buckets that exist; this just checks for keys for nonexistent
@ -1481,16 +1506,14 @@ int bch2_check_alloc_info(struct bch_fs *c)
if (ret < 0)
goto err;
ret = for_each_btree_key_commit(&trans, iter,
ret = for_each_btree_key2(&trans, iter,
BTREE_ID_need_discard, POS_MIN,
BTREE_ITER_PREFETCH, k,
NULL, NULL, BTREE_INSERT_NOFAIL|BTREE_INSERT_LAZY_RW,
bch2_check_discard_freespace_key(&trans, &iter)) ?:
for_each_btree_key_commit(&trans, iter,
bch2_check_discard_freespace_key(&trans, &iter, k.k->p)) ?:
for_each_btree_key2(&trans, iter,
BTREE_ID_freespace, POS_MIN,
BTREE_ITER_PREFETCH, k,
NULL, NULL, BTREE_INSERT_NOFAIL|BTREE_INSERT_LAZY_RW,
bch2_check_discard_freespace_key(&trans, &iter)) ?:
bch2_check_discard_freespace_key(&trans, &iter, k.k->p)) ?:
for_each_btree_key_commit(&trans, iter,
BTREE_ID_bucket_gens, POS_MIN,
BTREE_ITER_PREFETCH, k,