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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 <behlendorf1@llnl.gov>
Signed-off-by: Alexander Motin <alexander.motin@TrueNAS.com>
Closes #17921
This commit is contained in:
Alexander Motin 2025-11-10 17:26:15 -05:00 committed by Brian Behlendorf
parent ac0bc4cc00
commit e895c76194
1 changed files with 1 additions and 3 deletions
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4
module/zfs/zap_micro.c
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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);