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BRT: Check bv_mos_entries in brt_entry_lookup()

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When vdev first sees some block cloning, there is a window when
brt_maybe_exists() might already return true since something was
cloned, but bv_mos_entries is still 0 since BRT ZAP was not yet
created.  In such case we should not try to look into the ZAP
and dereference NULL bv_mos_entries_dnode.

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 #16851
This commit is contained in:
Alexander Motin 2024-12-12 13:22:41 -05:00 committed by Brian Behlendorf
parent 0d51852ec7
commit 38875918d8
1 changed files with 3 additions and 0 deletions
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3
module/zfs/brt.c
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@ -859,6 +859,9 @@ brt_entry_lookup(brt_vdev_t *brtvd, brt_entry_t *bre)
{
uint64_t off = BRE_OFFSET(bre);
if (brtvd->bv_mos_entries == 0)
return (SET_ERROR(ENOENT));
return (zap_lookup_uint64_by_dnode(brtvd->bv_mos_entries_dnode,
&off, BRT_KEY_WORDS, 1, sizeof (bre->bre_count), &bre->bre_count));
}