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ZAP: Remove dmu_object_info_from_dnode() call

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dmu_object_info_from_dnode() takes two locks and copies plenty of
data that we don't need in zap_lockdir_impl().  Just read dn_type
directly in this hot path.

Reviewed-by: Brian Behlendorf <[email protected]>
Signed-off-by: Alexander Motin <[email protected]>
Closes #17921
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Alexander Motin authored and Brian Behlendorf committed 2025-11-12 13:07:00 -08:00
1 parent ac0bc4cc00
commit e895c76194
1 file changed
+1 -3
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module/zfs/zap_micro.c
+1 -3
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@@ -625,12 +625,10 @@ zap_lockdir_impl(dnode_t *dn, dmu_buf_t *db, const void *tag, dmu_tx_t *tx,
ASSERT0(db->db_offset);
objset_t *os = dmu_buf_get_objset(db);
uint64_t obj = db->db_object;
dmu_object_info_t doi;
*zapp = NULL;
dmu_object_info_from_dnode(dn, &doi);
if (DMU_OT_BYTESWAP(doi.doi_type) != DMU_BSWAP_ZAP)
if (DMU_OT_BYTESWAP(dn->dn_type) != DMU_BSWAP_ZAP)
return (SET_ERROR(EINVAL));
zap_t *zap = dmu_buf_get_user(db);