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Add BRT support to zpool prefetch command

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Implement BRT (Block Reference Table) prefetch functionality similar
to existing DDT prefetch.  This allows preloading BRT metadata into
ARC to improve performance for block cloning operations and frees
of earlier cloned blocks.

Make -t parameter optional.  When omitted, prefetch all supported
metadata types (both DDT and BRT now).

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Alexander Motin <alexander.motin@TrueNAS.com>
Closes #17890
This commit is contained in:
Alexander Motin
2025-11-10 19:16:22 -05:00
committed by GitHub
parent cc5cae5475
commit b4f073b5a6
12 changed files with 198 additions and 42 deletions
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module/zfs/brt.c
+25
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@@ -1510,6 +1510,31 @@ brt_load(spa_t *spa)
return (error);
}
void
brt_prefetch_all(spa_t *spa)
{
/*
* Load all BRT entries for each vdev. This is intended to perform
* a prefetch on all such blocks. For the same reason that brt_prefetch
* (called from brt_pending_add) isn't locked, this is also not locked.
*/
brt_rlock(spa);
for (uint64_t vdevid = 0; vdevid < spa->spa_brt_nvdevs; vdevid++) {
brt_vdev_t *brtvd = spa->spa_brt_vdevs[vdevid];
brt_unlock(spa);
rw_enter(&brtvd->bv_mos_entries_lock, RW_READER);
if (brtvd->bv_mos_entries != 0) {
(void) zap_prefetch_object(spa->spa_meta_objset,
brtvd->bv_mos_entries);
}
rw_exit(&brtvd->bv_mos_entries_lock);
brt_rlock(spa);
}
brt_unlock(spa);
}
void
brt_unload(spa_t *spa)
{