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bcachefs: Optimize bch2_trans_start_alloc_update()

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Avoid doing more updates if we already have one.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet
2025-05-16 17:29:53 -04:00
parent 9469556a5f
commit 295dbf50e5
1 changed files with 18 additions and 3 deletions
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21
fs/bcachefs/alloc_background.c
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@@ -479,11 +479,26 @@ struct bkey_i_alloc_v4 *bch2_trans_start_alloc_update(struct btree_trans *trans,
enum btree_iter_update_trigger_flags flags)
{
struct btree_iter iter;
struct bkey_i_alloc_v4 *a = bch2_trans_start_alloc_update_noupdate(trans, &iter, pos);
int ret = PTR_ERR_OR_ZERO(a);
if (ret)
struct bkey_s_c k = bch2_bkey_get_iter(trans, &iter, BTREE_ID_alloc, pos,
BTREE_ITER_with_updates|
BTREE_ITER_cached|
BTREE_ITER_intent);
int ret = bkey_err(k);
if (unlikely(ret))
return ERR_PTR(ret);
if ((void *) k.v >= trans->mem &&
(void *) k.v < trans->mem + trans->mem_top) {
bch2_trans_iter_exit(trans, &iter);
return container_of(bkey_s_c_to_alloc_v4(k).v, struct bkey_i_alloc_v4, v);
}
struct bkey_i_alloc_v4 *a = bch2_alloc_to_v4_mut_inlined(trans, k);
if (IS_ERR(a)) {
bch2_trans_iter_exit(trans, &iter);
return a;
}
ret = bch2_trans_update_ip(trans, &iter, &a->k_i, flags, _RET_IP_);
bch2_trans_iter_exit(trans, &iter);
return unlikely(ret) ? ERR_PTR(ret) : a;