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Add ASSERT to debug encryption key mapping issues

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This patch simply adds an ASSERT that confirms that the last
decrypting reference on a dataset waits until the dataset is
no longer dirty. This should help to debug issues where the
ZIO layer cannot find encryption keys after a dataset has been
disowned.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Tom Caputi <tcaputi@datto.com>
Closes #7637
This commit is contained in:
Tom Caputi
2018-06-18 17:10:54 -04:00
committed by Brian Behlendorf
parent 517d247192
commit cd32e5db8b
3 changed files with 24 additions and 0 deletions
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module/zfs/dbuf.c
+14
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@@ -3306,6 +3306,20 @@ dbuf_refcount(dmu_buf_impl_t *db)
return (refcount_count(&db->db_holds));
}
uint64_t
dmu_buf_user_refcount(dmu_buf_t *db_fake)
{
uint64_t holds;
dmu_buf_impl_t *db = (dmu_buf_impl_t *)db_fake;
mutex_enter(&db->db_mtx);
ASSERT3U(refcount_count(&db->db_holds), >=, db->db_dirtycnt);
holds = refcount_count(&db->db_holds) - db->db_dirtycnt;
mutex_exit(&db->db_mtx);
return (holds);
}
void *
dmu_buf_replace_user(dmu_buf_t *db_fake, dmu_buf_user_t *old_user,
dmu_buf_user_t *new_user)