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bcachefs: Assert that we don't lock nodes when !trans->locked

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We rely on the trans->locked to know if a trans has nodes locked for
assertions about deadlocks; there can't be more than one trans in the
same process that is locked.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2024-06-30 09:25:56 -04:00
parent a8cdf0ff46
commit f1625637b8
3 changed files with 17 additions and 16 deletions
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7
fs/bcachefs/btree_locking.h
View File

@ -218,14 +218,12 @@ static inline int __btree_node_lock_nopath(struct btree_trans *trans,
bool lock_may_not_fail,
unsigned long ip)
{
int ret;
trans->lock_may_not_fail = lock_may_not_fail;
trans->lock_must_abort = false;
trans->locking = b;
ret = six_lock_ip_waiter(&b->lock, type, &trans->locking_wait,
bch2_six_check_for_deadlock, trans, ip);
int ret = six_lock_ip_waiter(&b->lock, type, &trans->locking_wait,
bch2_six_check_for_deadlock, trans, ip);
WRITE_ONCE(trans->locking, NULL);
WRITE_ONCE(trans->locking_wait.start_time, 0);
@ -284,6 +282,7 @@ static inline int btree_node_lock(struct btree_trans *trans,
int ret = 0;
EBUG_ON(level >= BTREE_MAX_DEPTH);
bch2_trans_verify_not_unlocked(trans);
if (likely(six_trylock_type(&b->lock, type)) ||
btree_node_lock_increment(trans, b, level, (enum btree_node_locked_type) type) ||

24
fs/bcachefs/btree_update_interior.c
View File

@ -731,6 +731,18 @@ static void btree_update_nodes_written(struct btree_update *as)
bch2_fs_fatal_err_on(ret && !bch2_journal_error(&c->journal), c,
"%s", bch2_err_str(ret));
err:
/*
* Ensure transaction is unlocked before using btree_node_lock_nopath()
* (the use of which is always suspect, we need to work on removing this
* in the future)
*
* It should be, but bch2_path_get_unlocked_mut() -> bch2_path_get()
* calls bch2_path_upgrade(), before we call path_make_mut(), so we may
* rarely end up with a locked path besides the one we have here:
*/
bch2_trans_unlock(trans);
bch2_trans_begin(trans);
/*
* We have to be careful because another thread might be getting ready
* to free as->b and calling btree_update_reparent() on us - we'll
@ -750,18 +762,6 @@ err:
* we're in journal error state:
*/
/*
* Ensure transaction is unlocked before using
* btree_node_lock_nopath() (the use of which is always suspect,
* we need to work on removing this in the future)
*
* It should be, but bch2_path_get_unlocked_mut() -> bch2_path_get()
* calls bch2_path_upgrade(), before we call path_make_mut(), so
* we may rarely end up with a locked path besides the one we
* have here:
*/
bch2_trans_unlock(trans);
bch2_trans_begin(trans);
btree_path_idx_t path_idx = bch2_path_get_unlocked_mut(trans,
as->btree_id, b->c.level, b->key.k.p);
struct btree_path *path = trans->paths + path_idx;

2
fs/bcachefs/btree_update_interior.h
View File

@ -159,6 +159,8 @@ static inline int bch2_foreground_maybe_merge(struct btree_trans *trans,
unsigned level,
unsigned flags)
{
bch2_trans_verify_not_unlocked(trans);
return bch2_foreground_maybe_merge_sibling(trans, path, level, flags,
btree_prev_sib) ?:
bch2_foreground_maybe_merge_sibling(trans, path, level, flags,