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bcachefs: btree_trans->write_locked

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As prep work for the next patch to fix a key cache reclaim issue, we
need to start tracking whether we're currently holding write locks - so
that we can release and retake the before calling into memory reclaim.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2023-11-06 19:49:47 -05:00
parent c65c13f0ea
commit 3b8c450777
2 changed files with 50 additions and 36 deletions
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85
fs/bcachefs/btree_trans_commit.c
View file

@ -78,6 +78,53 @@ inline void bch2_btree_node_prep_for_write(struct btree_trans *trans,
bch2_btree_init_next(trans, b);
}
static noinline int trans_lock_write_fail(struct btree_trans *trans, struct btree_insert_entry *i)
{
while (--i >= trans->updates) {
if (same_leaf_as_prev(trans, i))
continue;
bch2_btree_node_unlock_write(trans, i->path, insert_l(i)->b);
}
trace_and_count(trans->c, trans_restart_would_deadlock_write, trans);
return btree_trans_restart(trans, BCH_ERR_transaction_restart_would_deadlock_write);
}
static inline int bch2_trans_lock_write(struct btree_trans *trans)
{
struct btree_insert_entry *i;
EBUG_ON(trans->write_locked);
trans_for_each_update(trans, i) {
if (same_leaf_as_prev(trans, i))
continue;
if (bch2_btree_node_lock_write(trans, i->path, &insert_l(i)->b->c))
return trans_lock_write_fail(trans, i);
if (!i->cached)
bch2_btree_node_prep_for_write(trans, i->path, insert_l(i)->b);
}
trans->write_locked = true;
return 0;
}
static inline void bch2_trans_unlock_write(struct btree_trans *trans)
{
if (likely(trans->write_locked)) {
struct btree_insert_entry *i;
trans_for_each_update(trans, i)
if (!same_leaf_as_prev(trans, i))
bch2_btree_node_unlock_write_inlined(trans, i->path,
insert_l(i)->b);
trans->write_locked = false;
}
}
/* Inserting into a given leaf node (last stage of insert): */
/* Handle overwrites and do insert, for non extents: */
@ -732,37 +779,6 @@ revert_fs_usage:
return ret;
}
static noinline int trans_lock_write_fail(struct btree_trans *trans, struct btree_insert_entry *i)
{
while (--i >= trans->updates) {
if (same_leaf_as_prev(trans, i))
continue;
bch2_btree_node_unlock_write(trans, i->path, insert_l(i)->b);
}
trace_and_count(trans->c, trans_restart_would_deadlock_write, trans);
return btree_trans_restart(trans, BCH_ERR_transaction_restart_would_deadlock_write);
}
static inline int trans_lock_write(struct btree_trans *trans)
{
struct btree_insert_entry *i;
trans_for_each_update(trans, i) {
if (same_leaf_as_prev(trans, i))
continue;
if (bch2_btree_node_lock_write(trans, i->path, &insert_l(i)->b->c))
return trans_lock_write_fail(trans, i);
if (!i->cached)
bch2_btree_node_prep_for_write(trans, i->path, insert_l(i)->b);
}
return 0;
}
static noinline void bch2_drop_overwrites_from_journal(struct btree_trans *trans)
{
struct btree_insert_entry *i;
@ -838,7 +854,7 @@ static inline int do_bch2_trans_commit(struct btree_trans *trans, unsigned flags
if (unlikely(ret))
return ret;
ret = trans_lock_write(trans);
ret = bch2_trans_lock_write(trans);
if (unlikely(ret))
return ret;
@ -847,10 +863,7 @@ static inline int do_bch2_trans_commit(struct btree_trans *trans, unsigned flags
if (!ret && unlikely(trans->journal_replay_not_finished))
bch2_drop_overwrites_from_journal(trans);
trans_for_each_update(trans, i)
if (!same_leaf_as_prev(trans, i))
bch2_btree_node_unlock_write_inlined(trans, i->path,
insert_l(i)->b);
bch2_trans_unlock_write(trans);
if (!ret && trans->journal_pin)
bch2_journal_pin_add(&c->journal, trans->journal_res.seq,

1
fs/bcachefs/btree_types.h
View file

@ -409,6 +409,7 @@ struct btree_trans {
bool journal_transaction_names:1;
bool journal_replay_not_finished:1;
bool notrace_relock_fail:1;
bool write_locked:1;
enum bch_errcode restarted:16;
u32 restart_count;
unsigned long last_begin_ip;