Fix panics when truncating/deleting files

There's an union in dbuf_dirty_record_t; dr_brtwrite could evaluate
to B_TRUE if the dirty record is of another type than dl. Adding
more explicit dr type check before trying to access dr_brtwrite.

Fixes two similar panics:

[ 1373.806119] VERIFY0(db->db_level) failed (0 == 1)
[ 1373.807232] PANIC at dbuf.c:2549:dbuf_undirty()
[ 1373.814979]  dump_stack_lvl+0x71/0x90
[ 1373.815799]  spl_panic+0xd3/0x100 [spl]
[ 1373.827709]  dbuf_undirty+0x62a/0x970 [zfs]
[ 1373.829204]  dmu_buf_will_dirty_impl+0x1e9/0x5b0 [zfs]
[ 1373.831010]  dnode_free_range+0x532/0x1220 [zfs]
[ 1373.833922]  dmu_free_long_range+0x4e0/0x930 [zfs]
[ 1373.835277]  zfs_trunc+0x75/0x1e0 [zfs]
[ 1373.837958]  zfs_freesp+0x9b/0x470 [zfs]
[ 1373.847236]  zfs_setattr+0x161a/0x3500 [zfs]
[ 1373.855267]  zpl_setattr+0x125/0x320 [zfs]
[ 1373.856725]  notify_change+0x1ee/0x4a0
[ 1373.859207]  do_truncate+0x7f/0xd0
[ 1373.859968]  do_sys_ftruncate+0x28e/0x2e0
[ 1373.860962]  do_syscall_64+0x38/0x90
[ 1373.861751]  entry_SYSCALL_64_after_hwframe+0x6e/0xd8

[ 1822.381337] VERIFY0(db->db_level) failed (0 == 1)
[ 1822.382376] PANIC at dbuf.c:2549:dbuf_undirty()
[ 1822.389232]  dump_stack_lvl+0x71/0x90
[ 1822.389920]  spl_panic+0xd3/0x100 [spl]
[ 1822.399567]  dbuf_undirty+0x62a/0x970 [zfs]
[ 1822.400583]  dmu_buf_will_dirty_impl+0x1e9/0x5b0 [zfs]
[ 1822.401752]  dnode_free_range+0x532/0x1220 [zfs]
[ 1822.402841]  dmu_object_free+0x74/0x120 [zfs]
[ 1822.403869]  zfs_znode_delete+0x75/0x120 [zfs]
[ 1822.404906]  zfs_rmnode+0x3f6/0x7f0 [zfs]
[ 1822.405870]  zfs_inactive+0xa3/0x610 [zfs]
[ 1822.407803]  zpl_evict_inode+0x3e/0x90 [zfs]
[ 1822.408831]  evict+0xc1/0x1c0
[ 1822.409387]  do_unlinkat+0x147/0x300
[ 1822.410060]  __x64_sys_unlinkat+0x33/0x60
[ 1822.410802]  do_syscall_64+0x38/0x90
[ 1822.411458]  entry_SYSCALL_64_after_hwframe+0x6e/0xd8

Signed-off-by: Pavel Snajdr <snajpa@snajpa.net>

module/zfs/dbuf.c

@@ -2638,28 +2638,28 @@ dmu_buf_will_dirty_impl(dmu_buf_t *db_fake, int flags, dmu_tx_t *tx)
 	mutex_enter(&db->db_mtx);
 
 	if (db->db_state == DB_CACHED || db->db_state == DB_NOFILL) {
-		dbuf_dirty_record_t *dr = dbuf_find_dirty_eq(db, tx->tx_txg);
 		/*
 		 * It's possible that it is already dirty but not cached,
 		 * because there are some calls to dbuf_dirty() that don't
 		 * go through dmu_buf_will_dirty().
 		 */
-		if (dr != NULL) {
-			if (dr->dt.dl.dr_brtwrite) {
-				/*
-				 * Block cloning: If we are dirtying a cloned
-				 * block, we cannot simply redirty it, because
-				 * this dr has no data associated with it.
-				 * We will go through a full undirtying below,
-				 * before dirtying it again.
-				 */
-				undirty = B_TRUE;
-			} else {
-				/* This dbuf is already dirty and cached. */
-				dbuf_redirty(dr);
-				mutex_exit(&db->db_mtx);
-				return;
-			}
+		dbuf_dirty_record_t *dr = dbuf_find_dirty_eq(db, tx->tx_txg);
+		if (dr != NULL && dr->dr_dbuf != NULL &&
+		    dr->dr_dbuf->db_level == 0 &&
+		    dr->dt.dl.dr_brtwrite) {
+			/*
+			 * Block cloning: If we are dirtying a cloned
+			 * block, we cannot simply redirty it, because
+			 * this dr has no data associated with it.
+			 * We will go through a full undirtying below,
+			 * before dirtying it again.
+			 */
+			undirty = B_TRUE;
+		} else if (dr != NULL) {
+			/* This dbuf is already dirty and cached. */
+			dbuf_redirty(dr);
+			mutex_exit(&db->db_mtx);
+			return;
 		}
 	}
 	mutex_exit(&db->db_mtx);