bcachefs: More BCH_SB_MEMBER_INVALID support

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/buckets.c

@@ -100,7 +100,8 @@ static int bch2_check_fix_ptr(struct btree_trans *trans,
 
 	struct bch_dev *ca = bch2_dev_tryget(c, p.ptr.dev);
 	if (!ca) {
-		if (fsck_err(trans, ptr_to_invalid_device,
+		if (fsck_err_on(p.ptr.dev != BCH_SB_MEMBER_INVALID,
+				trans, ptr_to_invalid_device,
 				"pointer to missing device %u\n"
 				"while marking %s",
 				p.ptr.dev,
@@ -562,7 +563,7 @@ static int bch2_trigger_pointer(struct btree_trans *trans,
 	struct bch_fs *c = trans->c;
 	struct bch_dev *ca = bch2_dev_tryget(c, p.ptr.dev);
 	if (unlikely(!ca)) {
-		if (insert)
+		if (insert && p.ptr.dev != BCH_SB_MEMBER_INVALID)
 			ret = -EIO;
 		goto err;
 	}

fs/bcachefs/ec.h

@@ -97,7 +97,9 @@ static inline bool __bch2_ptr_matches_stripe(const struct bch_extent_ptr *stripe
 					     const struct bch_extent_ptr *data_ptr,
 					     unsigned sectors)
 {
-	return  data_ptr->dev    == stripe_ptr->dev &&
+	return  (data_ptr->dev    == stripe_ptr->dev ||
+		 data_ptr->dev    == BCH_SB_MEMBER_INVALID ||
+		 stripe_ptr->dev  == BCH_SB_MEMBER_INVALID) &&
 		data_ptr->gen    == stripe_ptr->gen &&
 		data_ptr->offset >= stripe_ptr->offset &&
 		data_ptr->offset  < stripe_ptr->offset + sectors;

fs/bcachefs/extents.c

@@ -787,6 +787,11 @@ void bch2_bkey_drop_ptr_noerror(struct bkey_s k, struct bch_extent_ptr *ptr)
 	union bch_extent_entry *entry = to_entry(ptr), *next;
 	bool drop_crc = true;
 
+	if (k.k->type == KEY_TYPE_stripe) {
+		ptr->dev = BCH_SB_MEMBER_INVALID;
+		return;
+	}
+
 	EBUG_ON(ptr < &ptrs.start->ptr ||
 		ptr >= &ptrs.end->ptr);
 	EBUG_ON(ptr->type != 1 << BCH_EXTENT_ENTRY_ptr);

fs/bcachefs/replicas.c

@@ -796,7 +796,7 @@ bool bch2_have_enough_devs(struct bch_fs *c, struct bch_devs_mask devs,
 			nr_online += test_bit(e->devs[i], devs.d);
 
 			struct bch_dev *ca = bch2_dev_rcu(c, e->devs[i]);
-			nr_failed += ca && ca->mi.state == BCH_MEMBER_STATE_failed;
+			nr_failed += !ca || ca->mi.state == BCH_MEMBER_STATE_failed;
 		}
 		rcu_read_unlock();