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bcachefs: More drop_locks_do() conversions

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Using drop_locks_do() ensures that every unlock() is paired with a
relock(), with proper error checking.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2023-05-30 04:59:30 -04:00
parent bb125baf51
commit 49c7cd9d8d
4 changed files with 18 additions and 59 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
fs/bcachefs/btree_iter.c
View file

@ -2892,9 +2892,7 @@ u32 bch2_trans_begin(struct btree_trans *trans)
if (!trans->restarted &&
(need_resched() ||
now - trans->last_begin_time > BTREE_TRANS_MAX_LOCK_HOLD_TIME_NS)) {
bch2_trans_unlock(trans);
cond_resched();
bch2_trans_relock(trans);
drop_locks_do(trans, (cond_resched(), 0));
now = local_clock();
}
trans->last_begin_time = now;

12
fs/bcachefs/btree_update_interior.c
View file

@ -1126,23 +1126,19 @@ bch2_btree_update_start(struct btree_trans *trans, struct btree_path *path,
BTREE_UPDATE_JOURNAL_RES,
journal_flags|JOURNAL_RES_GET_NONBLOCK);
if (ret) {
bch2_trans_unlock(trans);
if (flags & BTREE_INSERT_JOURNAL_RECLAIM) {
ret = -BCH_ERR_journal_reclaim_would_deadlock;
goto err;
}
ret = bch2_journal_preres_get(&c->journal, &as->journal_preres,
ret = drop_locks_do(trans,
bch2_journal_preres_get(&c->journal, &as->journal_preres,
BTREE_UPDATE_JOURNAL_RES,
journal_flags);
if (ret) {
journal_flags));
if (ret == -BCH_ERR_journal_preres_get_blocked) {
trace_and_count(c, trans_restart_journal_preres_get, trans, _RET_IP_, journal_flags);
ret = btree_trans_restart(trans, BCH_ERR_transaction_restart_journal_preres_get);
goto err;
}
ret = bch2_trans_relock(trans);
if (ret)
goto err;
}

42
fs/bcachefs/btree_update_leaf.c
View file

@ -947,34 +947,20 @@ int bch2_trans_commit_error(struct btree_trans *trans, unsigned flags,
trace_and_count(c, trans_restart_btree_node_split, trans, trace_ip, i->path);
break;
case -BCH_ERR_btree_insert_need_mark_replicas:
bch2_trans_unlock(trans);
ret = bch2_replicas_delta_list_mark(c, trans->fs_usage_deltas);
if (ret)
break;
ret = bch2_trans_relock(trans);
if (ret)
trace_and_count(c, trans_restart_mark_replicas, trans, trace_ip);
ret = drop_locks_do(trans,
bch2_replicas_delta_list_mark(c, trans->fs_usage_deltas));
break;
case -BCH_ERR_journal_res_get_blocked:
bch2_trans_unlock(trans);
if ((flags & BTREE_INSERT_JOURNAL_RECLAIM) &&
!(flags & JOURNAL_WATERMARK_reserved)) {
ret = -BCH_ERR_journal_reclaim_would_deadlock;
break;
}
ret = bch2_trans_journal_res_get(trans,
ret = drop_locks_do(trans,
bch2_trans_journal_res_get(trans,
(flags & JOURNAL_WATERMARK_MASK)|
JOURNAL_RES_GET_CHECK);
if (ret)
break;
ret = bch2_trans_relock(trans);
if (ret)
trace_and_count(c, trans_restart_journal_res_get, trans, trace_ip);
JOURNAL_RES_GET_CHECK));
break;
case -BCH_ERR_btree_insert_need_journal_reclaim:
bch2_trans_unlock(trans);
@ -987,8 +973,6 @@ int bch2_trans_commit_error(struct btree_trans *trans, unsigned flags,
break;
ret = bch2_trans_relock(trans);
if (ret)
trace_and_count(c, trans_restart_journal_reclaim, trans, trace_ip);
break;
case -BCH_ERR_btree_insert_need_flush_buffer: {
struct btree_write_buffer *wb = &c->btree_write_buffer;
@ -996,20 +980,20 @@ int bch2_trans_commit_error(struct btree_trans *trans, unsigned flags,
ret = 0;
if (wb->state.nr > wb->size * 3 / 4) {
bch2_trans_reset_updates(trans);
bch2_trans_unlock(trans);
mutex_lock(&wb->flush_lock);
if (wb->state.nr > wb->size * 3 / 4)
if (wb->state.nr > wb->size * 3 / 4) {
bch2_trans_begin(trans);
ret = __bch2_btree_write_buffer_flush(trans,
flags|BTREE_INSERT_NOCHECK_RW, true);
else
if (!ret) {
trace_and_count(c, trans_restart_write_buffer_flush, trans, _THIS_IP_);
ret = btree_trans_restart(trans, BCH_ERR_transaction_restart_write_buffer_flush);
}
} else {
mutex_unlock(&wb->flush_lock);
if (!ret) {
trace_and_count(c, trans_restart_write_buffer_flush, trans, _THIS_IP_);
ret = btree_trans_restart(trans, BCH_ERR_transaction_restart_write_buffer_flush);
ret = bch2_trans_relock(trans);
}
}
break;

19
fs/bcachefs/trace.h
View file

@ -905,13 +905,6 @@ DEFINE_EVENT(transaction_event, trans_blocked_journal_reclaim,
TP_ARGS(trans, caller_ip)
);
DEFINE_EVENT(transaction_event, trans_restart_journal_res_get,
TP_PROTO(struct btree_trans *trans,
unsigned long caller_ip),
TP_ARGS(trans, caller_ip)
);
TRACE_EVENT(trans_restart_journal_preres_get,
TP_PROTO(struct btree_trans *trans,
unsigned long caller_ip,
@ -935,12 +928,6 @@ TRACE_EVENT(trans_restart_journal_preres_get,
__entry->flags)
);
DEFINE_EVENT(transaction_event, trans_restart_journal_reclaim,
TP_PROTO(struct btree_trans *trans,
unsigned long caller_ip),
TP_ARGS(trans, caller_ip)
);
DEFINE_EVENT(transaction_event, trans_restart_fault_inject,
TP_PROTO(struct btree_trans *trans,
unsigned long caller_ip),
@ -953,12 +940,6 @@ DEFINE_EVENT(transaction_event, trans_traverse_all,
TP_ARGS(trans, caller_ip)
);
DEFINE_EVENT(transaction_event, trans_restart_mark_replicas,
TP_PROTO(struct btree_trans *trans,
unsigned long caller_ip),
TP_ARGS(trans, caller_ip)
);
DEFINE_EVENT(transaction_event, trans_restart_key_cache_raced,
TP_PROTO(struct btree_trans *trans,
unsigned long caller_ip),