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bcachefs: Check for nonce offset inconsistency in data_update path

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We've rarely been seeing a nonce offset inconsistency that doesn't show
up in tests: this adds some extra verification code to the data update
path that prints out more relevant info when it occurs.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2023-11-03 18:38:35 -04:00
parent 09b0283ee2
commit 701ff57eb3
1 changed files with 28 additions and 0 deletions
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28
fs/bcachefs/data_update.c
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@ -239,6 +239,34 @@ restart_drop_extra_replicas:
next_pos = insert->k.p;
/*
* Check for nonce offset inconsistency:
* This is debug code - we've been seeing this bug rarely, and
* it's been hard to reproduce, so this should give us some more
* information when it does occur:
*/
struct printbuf err = PRINTBUF;
int invalid = bch2_bkey_invalid(c, bkey_i_to_s_c(insert), __btree_node_type(0, m->btree_id), 0, &err);
printbuf_exit(&err);
if (invalid) {
struct printbuf buf = PRINTBUF;
prt_str(&buf, "about to insert invalid key in data update path");
prt_str(&buf, "\nold: ");
bch2_bkey_val_to_text(&buf, c, old);
prt_str(&buf, "\nk: ");
bch2_bkey_val_to_text(&buf, c, k);
prt_str(&buf, "\nnew: ");
bch2_bkey_val_to_text(&buf, c, bkey_i_to_s_c(insert));
bch2_print_string_as_lines(KERN_ERR, buf.buf);
printbuf_exit(&buf);
bch2_fatal_error(c);
goto out;
}
ret = bch2_insert_snapshot_whiteouts(trans, m->btree_id,
k.k->p, bkey_start_pos(&insert->k)) ?:
bch2_insert_snapshot_whiteouts(trans, m->btree_id,