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bcachefs: Fix an assertion pop

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There was a race: btree node writes drop their reference on journal pins
before clearing the btree_node_write_in_flight flag.

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 2021-01-20 17:31:31 -05:00 committed by Kent Overstreet
parent 33ccd7188e
commit a5cd80ea99
3 changed files with 1 additions and 22 deletions
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17
fs/bcachefs/btree_io.c
View File

@ -1829,23 +1829,6 @@ void bch2_btree_flush_all_writes(struct bch_fs *c)
__bch2_btree_flush_all(c, BTREE_NODE_write_in_flight);
}
void bch2_btree_verify_flushed(struct bch_fs *c)
{
struct bucket_table *tbl;
struct rhash_head *pos;
struct btree *b;
unsigned i;
rcu_read_lock();
for_each_cached_btree(b, c, tbl, i, pos) {
unsigned long flags = READ_ONCE(b->flags);
BUG_ON((flags & (1 << BTREE_NODE_dirty)) ||
(flags & (1 << BTREE_NODE_write_in_flight)));
}
rcu_read_unlock();
}
void bch2_dirty_btree_nodes_to_text(struct printbuf *out, struct bch_fs *c)
{
struct bucket_table *tbl;

1
fs/bcachefs/btree_io.h
View File

@ -185,7 +185,6 @@ do { \
void bch2_btree_flush_all_reads(struct bch_fs *);
void bch2_btree_flush_all_writes(struct bch_fs *);
void bch2_btree_verify_flushed(struct bch_fs *);
void bch2_dirty_btree_nodes_to_text(struct printbuf *, struct bch_fs *);
static inline void compat_bformat(unsigned level, enum btree_id btree_id,

5
fs/bcachefs/super.c
View File

@ -242,10 +242,7 @@ nowrote_alloc:
* the journal kicks off btree writes via reclaim - wait for in flight
* writes after stopping journal:
*/
if (test_bit(BCH_FS_EMERGENCY_RO, &c->flags))
bch2_btree_flush_all_writes(c);
else
bch2_btree_verify_flushed(c);
bch2_btree_flush_all_writes(c);
/*
* After stopping journal: