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bcachefs: Don't issue btree writes that weren't journalled

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If we have an error in the btree interior update path that prevents us
from journalling the update, we can't issue the corresponding btree node
write - we didn't get a journal sequence number that would cause it to
be ignored in recovery.

Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2020-12-03 16:20:18 -05:00 committed by Kent Overstreet
parent afa7cb0c36
commit 5db43418d5
3 changed files with 25 additions and 5 deletions
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5
fs/bcachefs/btree_io.c
View File

@ -1499,6 +1499,9 @@ void __bch2_btree_node_write(struct bch_fs *c, struct btree *b,
if (!btree_node_may_write(b))
return;
if (old & (1 << BTREE_NODE_never_write))
return;
if (old & (1 << BTREE_NODE_write_in_flight)) {
btree_node_wait_on_io(b);
continue;
@ -1545,6 +1548,8 @@ void __bch2_btree_node_write(struct bch_fs *c, struct btree *b,
seq = max(seq, le64_to_cpu(i->journal_seq));
}
BUG_ON(b->written && !seq);
/* bch2_varint_decode may read up to 7 bytes past the end of the buffer: */
bytes += 8;

2
fs/bcachefs/btree_types.h
View File

@ -415,6 +415,7 @@ enum btree_flags {
BTREE_NODE_fake,
BTREE_NODE_old_extent_overwrite,
BTREE_NODE_need_rewrite,
BTREE_NODE_never_write,
};
BTREE_FLAG(read_in_flight);
@ -429,6 +430,7 @@ BTREE_FLAG(dying);
BTREE_FLAG(fake);
BTREE_FLAG(old_extent_overwrite);
BTREE_FLAG(need_rewrite);
BTREE_FLAG(never_write);
static inline struct btree_write *btree_current_write(struct btree *b)
{

23
fs/bcachefs/btree_update_interior.c
View File

@ -603,17 +603,30 @@ err:
list_del(&as->write_blocked_list);
if (!ret && as->b == b) {
/*
* Node might have been freed, recheck under
* btree_interior_update_lock:
*/
if (as->b == b) {
struct bset *i = btree_bset_last(b);
BUG_ON(!b->c.level);
BUG_ON(!btree_node_dirty(b));
i->journal_seq = cpu_to_le64(
max(journal_seq,
le64_to_cpu(i->journal_seq)));
if (!ret) {
i->journal_seq = cpu_to_le64(
max(journal_seq,
le64_to_cpu(i->journal_seq)));
bch2_btree_add_journal_pin(c, b, journal_seq);
bch2_btree_add_journal_pin(c, b, journal_seq);
} else {
/*
* If we didn't get a journal sequence number we
* can't write this btree node, because recovery
* won't know to ignore this write:
*/
set_btree_node_never_write(b);
}
}
mutex_unlock(&c->btree_interior_update_lock);