bcachefs: Kill stripe->dirty

This makes bch2_stripes_write() work more like bch2_alloc_write().
Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/btree_gc.c

@@ -583,7 +583,6 @@ static int bch2_gc_done(struct bch_fs *c,
 				iter.pos, ##__VA_ARGS__,		\
 				dst->_f, src->_f);			\
 		dst->_f = src->_f;					\
-		dst->dirty = true;					\
 		set_bit(BCH_FS_NEED_ALLOC_WRITE, &c->flags);		\
 	}
 #define copy_bucket_field(_f)						\
@@ -609,18 +608,24 @@ static int bch2_gc_done(struct bch_fs *c,
 		while ((src = genradix_iter_peek(&iter, &c->stripes[1]))) {
 			dst = genradix_ptr_alloc(&c->stripes[0], iter.pos, GFP_KERNEL);
 
-			copy_stripe_field(alive,	"alive");
-			copy_stripe_field(sectors,	"sectors");
-			copy_stripe_field(algorithm,	"algorithm");
-			copy_stripe_field(nr_blocks,	"nr_blocks");
-			copy_stripe_field(nr_redundant,	"nr_redundant");
-			copy_stripe_field(blocks_nonempty,
-					  "blocks_nonempty");
+			if (dst->alive		!= src->alive ||
+			    dst->sectors	!= src->sectors ||
+			    dst->algorithm	!= src->algorithm ||
+			    dst->nr_blocks	!= src->nr_blocks ||
+			    dst->nr_redundant	!= src->nr_redundant) {
+				bch_err(c, "unexpected stripe inconsistency at bch2_gc_done, confused");
+				ret = -EINVAL;
+				goto fsck_err;
+			}
 
 			for (i = 0; i < ARRAY_SIZE(dst->block_sectors); i++)
 				copy_stripe_field(block_sectors[i],
 						  "block_sectors[%u]", i);
 
+			dst->blocks_nonempty = 0;
+			for (i = 0; i < dst->nr_blocks; i++)
+				dst->blocks_nonempty += dst->block_sectors[i] != 0;
+
 			genradix_iter_advance(&iter, &c->stripes[1]);
 		}
 	}

fs/bcachefs/ec.c

@@ -1466,7 +1466,7 @@ static int __bch2_stripe_write_key(struct btree_trans *trans,
 				   size_t idx,
 				   struct bkey_i_stripe *new_key)
 {
-	struct bch_fs *c = trans->c;
+	const struct bch_stripe *v;
 	struct bkey_s_c k;
 	unsigned i;
 	int ret;
@@ -1481,16 +1481,17 @@ static int __bch2_stripe_write_key(struct btree_trans *trans,
 	if (k.k->type != KEY_TYPE_stripe)
 		return -EIO;
 
+	v = bkey_s_c_to_stripe(k).v;
+	for (i = 0; i < v->nr_blocks; i++)
+		if (m->block_sectors[i] != stripe_blockcount_get(v, i))
+			goto write;
+	return 0;
+write:
 	bkey_reassemble(&new_key->k_i, k);
 
-	spin_lock(&c->ec_stripes_heap_lock);
-
 	for (i = 0; i < new_key->v.nr_blocks; i++)
 		stripe_blockcount_set(&new_key->v, i,
 				      m->block_sectors[i]);
-	m->dirty = false;
-
-	spin_unlock(&c->ec_stripes_heap_lock);
 
 	bch2_trans_update(trans, iter, &new_key->k_i, 0);
 	return 0;
@@ -1514,7 +1515,7 @@ int bch2_stripes_write(struct bch_fs *c, unsigned flags)
 				   BTREE_ITER_SLOTS|BTREE_ITER_INTENT);
 
 	genradix_for_each(&c->stripes[0], giter, m) {
-		if (!m->dirty)
+		if (!m->alive)
 			continue;
 
 		ret = __bch2_trans_do(&trans, NULL, NULL,

fs/bcachefs/ec_types.h

@@ -18,8 +18,7 @@ struct stripe {
 	u8			nr_blocks;
 	u8			nr_redundant;
 
-	unsigned		alive:1;
-	unsigned		dirty:1;
+	unsigned		alive:1; /* does a corresponding key exist in stripes btree? */
 	unsigned		on_heap:1;
 	u8			blocks_nonempty;
 	u16			block_sectors[BCH_BKEY_PTRS_MAX];