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bcachefs: bch2_btree_update_start() refactoring

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This simplifies the logic in bch2_btree_update_start() a bit, handling
the unlock/block logic more locally.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2022-01-11 23:24:43 -05:00 committed by Kent Overstreet
parent 31f63fd124
commit 5f41739403
2 changed files with 55 additions and 50 deletions
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82
fs/bcachefs/btree_update_interior.c
View file

@ -413,19 +413,24 @@ static void bch2_btree_reserve_put(struct btree_update *as)
mutex_unlock(&c->btree_reserve_cache_lock);
}
static int bch2_btree_reserve_get(struct btree_update *as, unsigned nr_nodes[2],
unsigned flags, struct closure *cl)
static int bch2_btree_reserve_get(struct btree_update *as,
unsigned nr_nodes[2],
unsigned flags,
struct closure *cl)
{
struct bch_fs *c = as->c;
struct btree *b;
unsigned interior;
int ret;
int ret = 0;
BUG_ON(nr_nodes[0] + nr_nodes[1] > BTREE_RESERVE_MAX);
/*
* Protects reaping from the btree node cache and using the btree node
* open bucket reserve:
*
* BTREE_INSERT_NOWAIT only applies to btree node allocation, not
* blocking on this lock:
*/
ret = bch2_btree_cache_cannibalize_lock(c, cl);
if (ret)
@ -436,9 +441,8 @@ static int bch2_btree_reserve_get(struct btree_update *as, unsigned nr_nodes[2],
while (p->nr < nr_nodes[interior]) {
b = __bch2_btree_node_alloc(c, &as->disk_res,
flags & BTREE_INSERT_NOWAIT
? NULL : cl,
interior, flags);
flags & BTREE_INSERT_NOWAIT ? NULL : cl,
interior, flags);
if (IS_ERR(b)) {
ret = PTR_ERR(b);
goto err;
@ -447,12 +451,8 @@ static int bch2_btree_reserve_get(struct btree_update *as, unsigned nr_nodes[2],
p->b[p->nr++] = b;
}
}
bch2_btree_cache_cannibalize_unlock(c);
return 0;
err:
bch2_btree_cache_cannibalize_unlock(c);
trace_btree_reserve_get_fail(c, nr_nodes[0] + nr_nodes[1], cl);
return ret;
}
@ -958,21 +958,18 @@ bch2_btree_update_start(struct btree_trans *trans, struct btree_path *path,
{
struct bch_fs *c = trans->c;
struct btree_update *as;
struct closure cl;
u64 start_time = local_clock();
int disk_res_flags = (flags & BTREE_INSERT_NOFAIL)
? BCH_DISK_RESERVATION_NOFAIL : 0;
unsigned nr_nodes[2];
unsigned nr_nodes[2] = { 0, 0 };
unsigned update_level = level;
int journal_flags = flags & JOURNAL_WATERMARK_MASK;
int ret = 0;
BUG_ON(!path->should_be_locked);
closure_init_stack(&cl);
retry:
nr_nodes[0] = nr_nodes[1] = 0;
update_level = level;
if (flags & BTREE_INSERT_JOURNAL_RECLAIM)
journal_flags |= JOURNAL_RES_GET_NONBLOCK;
while (1) {
nr_nodes[!!update_level] += 1 + split;
@ -1044,27 +1041,21 @@ bch2_btree_update_start(struct btree_trans *trans, struct btree_path *path,
ret = bch2_journal_preres_get(&c->journal, &as->journal_preres,
BTREE_UPDATE_JOURNAL_RES,
journal_flags|JOURNAL_RES_GET_NONBLOCK);
if (ret == -EAGAIN) {
if (ret) {
bch2_trans_unlock(trans);
if (flags & BTREE_INSERT_JOURNAL_RECLAIM) {
bch2_btree_update_free(as);
btree_trans_restart(trans);
return ERR_PTR(ret);
}
ret = bch2_journal_preres_get(&c->journal, &as->journal_preres,
BTREE_UPDATE_JOURNAL_RES,
journal_flags);
BTREE_UPDATE_JOURNAL_RES,
journal_flags);
if (ret) {
trace_trans_restart_journal_preres_get(trans->fn, _RET_IP_);
btree_trans_restart(trans);
goto err;
}
if (!bch2_trans_relock(trans)) {
ret = -EINTR;
ret = bch2_trans_relock(trans);
if (ret)
goto err;
}
}
ret = bch2_disk_reservation_get(c, &as->disk_res,
@ -1074,23 +1065,34 @@ bch2_btree_update_start(struct btree_trans *trans, struct btree_path *path,
if (ret)
goto err;
ret = bch2_btree_reserve_get(as, nr_nodes, flags, &cl);
if (ret)
ret = bch2_btree_reserve_get(as, nr_nodes, flags, NULL);
if (ret) {
struct closure cl;
closure_init_stack(&cl);
bch2_trans_unlock(trans);
do {
ret = bch2_btree_reserve_get(as, nr_nodes, flags, &cl);
closure_sync(&cl);
} while (ret == -EAGAIN);
}
if (ret) {
trace_btree_reserve_get_fail(trans->fn, _RET_IP_,
nr_nodes[0] + nr_nodes[1]);
goto err;
}
if (!bch2_trans_relock(trans)) {
ret = -EINTR;
goto err;
}
return as;
err:
bch2_btree_update_free(as);
if (ret == -EAGAIN) {
bch2_trans_unlock(trans);
closure_sync(&cl);
ret = -EINTR;
}
if (ret == -EINTR && bch2_trans_relock(trans))
goto retry;
return ERR_PTR(ret);
}

23
fs/bcachefs/trace.h
View file

@ -278,24 +278,27 @@ DEFINE_EVENT(bch_fs, btree_node_cannibalize_unlock,
);
TRACE_EVENT(btree_reserve_get_fail,
TP_PROTO(struct bch_fs *c, size_t required, struct closure *cl),
TP_ARGS(c, required, cl),
TP_PROTO(const char *trans_fn,
unsigned long caller_ip,
size_t required),
TP_ARGS(trans_fn, caller_ip, required),
TP_STRUCT__entry(
__field(dev_t, dev )
__array(char, trans_fn, 24 )
__field(unsigned long, caller_ip )
__field(size_t, required )
__field(struct closure *, cl )
),
TP_fast_assign(
__entry->dev = c->dev;
__entry->required = required;
__entry->cl = cl;
strlcpy(__entry->trans_fn, trans_fn, sizeof(__entry->trans_fn));
__entry->caller_ip = caller_ip;
__entry->required = required;
),
TP_printk("%d,%d required %zu by %p",
MAJOR(__entry->dev), MINOR(__entry->dev),
__entry->required, __entry->cl)
TP_printk("%s %pS required %zu",
__entry->trans_fn,
(void *) __entry->caller_ip,
__entry->required)
);
DEFINE_EVENT(btree_node, btree_split,