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ZIL: Call brt_pending_add() replaying TX_CLONE_RANGE

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zil_claim_clone_range() takes references on cloned blocks before ZIL
replay.  Later zil_free_clone_range() drops them after replay or on
dataset destroy.  The total balance is neutral.  It means on actual
replay we must take additional references, which would stay in BRT.

Without this blocks could be freed prematurely when either original
file or its clone are destroyed.  I've observed BRT being emptied
and the feature being deactivated after ZIL replay completion, which
should not have happened.  With the patch I see expected stats.

Reviewed-by: Kay Pedersen <mail@mkwg.de>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Rob Norris <robn@despairlabs.com>
Signed-off-by:	Alexander Motin <mav@FreeBSD.org>
Sponsored by:	iXsystems, Inc.
Closes #15603
This commit is contained in:
Alexander Motin
2023-11-29 13:51:34 -05:00
committed by GitHub
parent 8adf2e3066
commit a03ebd9bee
4 changed files with 12 additions and 15 deletions
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module/zfs/dmu.c
+2 -4
View File
@@ -2286,7 +2286,7 @@ out:
int
dmu_brt_clone(objset_t *os, uint64_t object, uint64_t offset, uint64_t length,
dmu_tx_t *tx, const blkptr_t *bps, size_t nbps, boolean_t replay)
dmu_tx_t *tx, const blkptr_t *bps, size_t nbps)
{
spa_t *spa;
dmu_buf_t **dbp, *dbuf;
@@ -2360,10 +2360,8 @@ dmu_brt_clone(objset_t *os, uint64_t object, uint64_t offset, uint64_t length,
* When data in embedded into BP there is no need to create
* BRT entry as there is no data block. Just copy the BP as
* it contains the data.
* Also, when replaying ZIL we don't want to bump references
* in the BRT as it was already done during ZIL claim.
*/
if (!replay && !BP_IS_HOLE(bp) && !BP_IS_EMBEDDED(bp)) {
if (!BP_IS_HOLE(bp) && !BP_IS_EMBEDDED(bp)) {
brt_pending_add(spa, bp, tx);
}
}