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Fix caching of DDT log and BRT

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Both DDT log and BRT counters we read on pool import and then only
append or overwrite in full blocks.  We don't need them in DMU or
ARC caches.  Fortunately we have DMU_UNCACHEDIO for this now.

Even more we don't need BRT in non-evictable metadata DMU caches,
since it will likely never fit there, while block the cache from
its original users.  Since DMU_OT_IS_METADATA_CACHED() has no way
to differentiate the new metadata types, mark BRT with storage
type of DMU_OT_DDT_ZAP.  As side effect it will also put it on
dedup device, but that should actually be right.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Alexander Motin <alexander.motin@TrueNAS.com>
Closes #17875
This commit is contained in:
Alexander Motin
2025-10-26 19:41:48 -04:00
committed by Brian Behlendorf
parent ea125eeb5d
commit ec268cdf97
4 changed files with 13 additions and 7 deletions
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include/sys/dmu.h
+1 -1
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@@ -126,7 +126,7 @@ typedef enum dmu_object_byteswap {
(ot) < DMU_OT_NUMTYPES)
#define DMU_OT_IS_METADATA_CACHED(ot) (((ot) & DMU_OT_NEWTYPE) ? \
B_TRUE : dmu_ot[(ot)].ot_dbuf_metadata_cache)
((ot) & DMU_OT_METADATA) != 0 : dmu_ot[(ot)].ot_dbuf_metadata_cache)
/*
* MDB doesn't have dmu_ot; it defines these macros itself.