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bcachefs: check_bp_exists() check for backpointers for stale pointers

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Early version of 'bcachefs_metadata_version_cached_backpointers' was
creating backpointers for stale cached pointers - whoops. Now we have to
repair those.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2025-02-11 13:33:08 -05:00
parent 2deae55804
commit c3c9957c81
1 changed files with 16 additions and 0 deletions
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16
fs/bcachefs/backpointers.c
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@ -514,6 +514,22 @@ static int check_bp_exists(struct btree_trans *trans,
if (!other_extent.k)
goto missing;
rcu_read_lock();
struct bch_dev *ca = bch2_dev_rcu_noerror(c, bp->k.p.inode);
if (ca) {
struct bkey_ptrs_c other_extent_ptrs = bch2_bkey_ptrs_c(other_extent);
bkey_for_each_ptr(other_extent_ptrs, ptr)
if (ptr->dev == bp->k.p.inode &&
dev_ptr_stale_rcu(ca, ptr)) {
ret = drop_dev_and_update(trans, other_bp.v->btree_id,
other_extent, bp->k.p.inode);
if (ret)
goto err;
goto out;
}
}
rcu_read_unlock();
if (bch2_extents_match(orig_k, other_extent)) {
printbuf_reset(&buf);
prt_printf(&buf, "duplicate versions of same extent, deleting smaller\n ");