bcachefs: Refactor replicas code

Awhile back the mechanism for garbage collecting unused replicas entries
was significantly improved, but some cleanup was missed - this patch
does that now.

This is also prep work for a patch to account for erasure coded parity
blocks separately - we need to consolidate the logic for
checking/marking the various replicas entries from one bkey into a
single function.
Signed-off-by: Kent Overstreet <kent.overstreet@gmail.com>
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/btree_gc.c

@@ -111,7 +111,7 @@ static int bch2_gc_mark_key(struct bch_fs *c, struct bkey_s_c k,
 			atomic64_set(&c->key_version, k.k->version.lo);
 
 		if (test_bit(BCH_FS_REBUILD_REPLICAS, &c->flags) ||
-		    fsck_err_on(!bch2_bkey_replicas_marked(c, k, false), c,
+		    fsck_err_on(!bch2_bkey_replicas_marked(c, k), c,
 				"superblock not marked as containing replicas (type %u)",
 				k.k->type)) {
 			ret = bch2_mark_bkey_replicas(c, k);

fs/bcachefs/extents.c

@@ -178,11 +178,6 @@ void bch2_btree_ptr_debugcheck(struct bch_fs *c, struct bkey_s_c k)
 	if (!percpu_down_read_trylock(&c->mark_lock))
 		return;
 
-	bch2_fs_inconsistent_on(!test_bit(BCH_FS_REBUILD_REPLICAS, &c->flags) &&
-		!bch2_bkey_replicas_marked_locked(c, k, false), c,
-		"btree key bad (replicas not marked in superblock):\n%s",
-		(bch2_bkey_val_to_text(&PBUF(buf), c, k), buf));
-
 	bkey_for_each_ptr(ptrs, ptr) {
 		ca = bch_dev_bkey_exists(c, ptr->dev);
 
@@ -266,11 +261,6 @@ void bch2_extent_debugcheck(struct bch_fs *c, struct bkey_s_c k)
 	if (!percpu_down_read_trylock(&c->mark_lock))
 		return;
 
-	bch2_fs_inconsistent_on(!test_bit(BCH_FS_REBUILD_REPLICAS, &c->flags) &&
-		!bch2_bkey_replicas_marked_locked(c, e.s_c, false), c,
-		"extent key bad (replicas not marked in superblock):\n%s",
-		(bch2_bkey_val_to_text(&PBUF(buf), c, e.s_c), buf));
-
 	extent_for_each_ptr_decode(e, p, entry) {
 		struct bch_dev *ca	= bch_dev_bkey_exists(c, p.ptr.dev);
 		struct bucket_mark mark = ptr_bucket_mark(ca, &p.ptr);

fs/bcachefs/journal_io.c

@@ -699,7 +699,7 @@ int bch2_journal_read(struct bch_fs *c, struct list_head *list)
 
 		if (!degraded &&
 		    (test_bit(BCH_FS_REBUILD_REPLICAS, &c->flags) ||
-		     fsck_err_on(!bch2_replicas_marked(c, &replicas.e, false), c,
+		     fsck_err_on(!bch2_replicas_marked(c, &replicas.e), c,
 				 "superblock not marked as containing replicas %s",
 				 (bch2_replicas_entry_to_text(&PBUF(buf),
 							      &replicas.e), buf)))) {

fs/bcachefs/replicas.c

@@ -213,29 +213,20 @@ static bool __replicas_has_entry(struct bch_replicas_cpu *r,
 	return __replicas_entry_idx(r, search) >= 0;
 }
 
-static bool bch2_replicas_marked_locked(struct bch_fs *c,
-			  struct bch_replicas_entry *search,
-			  bool check_gc_replicas)
+bool bch2_replicas_marked(struct bch_fs *c,
+			  struct bch_replicas_entry *search)
 {
+	bool marked;
+
 	if (!search->nr_devs)
 		return true;
 
 	verify_replicas_entry(search);
 
-	return __replicas_has_entry(&c->replicas, search) &&
-		(!check_gc_replicas ||
-		 likely((!c->replicas_gc.entries)) ||
-		 __replicas_has_entry(&c->replicas_gc, search));
-}
-
-bool bch2_replicas_marked(struct bch_fs *c,
-			  struct bch_replicas_entry *search,
-			  bool check_gc_replicas)
-{
-	bool marked;
-
 	percpu_down_read(&c->mark_lock);
-	marked = bch2_replicas_marked_locked(c, search, check_gc_replicas);
+	marked = __replicas_has_entry(&c->replicas, search) &&
+		(likely((!c->replicas_gc.entries)) ||
+		 __replicas_has_entry(&c->replicas_gc, search));
 	percpu_up_read(&c->mark_lock);
 
 	return marked;
@@ -426,66 +417,50 @@ static int bch2_mark_replicas_slowpath(struct bch_fs *c,
 	goto out;
 }
 
-int bch2_mark_replicas(struct bch_fs *c,
-		       struct bch_replicas_entry *r)
+static int __bch2_mark_replicas(struct bch_fs *c,
+				struct bch_replicas_entry *r,
+				bool check)
 {
-	return likely(bch2_replicas_marked(c, r, true))
-		? 0
+	return likely(bch2_replicas_marked(c, r))	? 0
+		: check					? -1
 		: bch2_mark_replicas_slowpath(c, r);
 }
 
-bool bch2_bkey_replicas_marked_locked(struct bch_fs *c,
-				      struct bkey_s_c k,
-				      bool check_gc_replicas)
+int bch2_mark_replicas(struct bch_fs *c, struct bch_replicas_entry *r)
+{
+	return __bch2_mark_replicas(c, r, false);
+}
+
+static int __bch2_mark_bkey_replicas(struct bch_fs *c, struct bkey_s_c k,
+				     bool check)
 {
 	struct bch_replicas_padded search;
 	struct bch_devs_list cached = bch2_bkey_cached_devs(k);
 	unsigned i;
+	int ret;
 
 	for (i = 0; i < cached.nr; i++) {
 		bch2_replicas_entry_cached(&search.e, cached.devs[i]);
 
-		if (!bch2_replicas_marked_locked(c, &search.e,
-						 check_gc_replicas))
-			return false;
+		ret = __bch2_mark_replicas(c, &search.e, check);
+		if (ret)
+			return ret;
 	}
 
 	bch2_bkey_to_replicas(&search.e, k);
 
-	return bch2_replicas_marked_locked(c, &search.e, check_gc_replicas);
+	return __bch2_mark_replicas(c, &search.e, check);
 }
 
 bool bch2_bkey_replicas_marked(struct bch_fs *c,
-			       struct bkey_s_c k,
-			       bool check_gc_replicas)
+			       struct bkey_s_c k)
 {
-	bool marked;
-
-	percpu_down_read(&c->mark_lock);
-	marked = bch2_bkey_replicas_marked_locked(c, k, check_gc_replicas);
-	percpu_up_read(&c->mark_lock);
-
-	return marked;
+	return __bch2_mark_bkey_replicas(c, k, true) == 0;
 }
 
 int bch2_mark_bkey_replicas(struct bch_fs *c, struct bkey_s_c k)
 {
-	struct bch_replicas_padded search;
-	struct bch_devs_list cached = bch2_bkey_cached_devs(k);
-	unsigned i;
-	int ret;
-
-	for (i = 0; i < cached.nr; i++) {
-		bch2_replicas_entry_cached(&search.e, cached.devs[i]);
-
-		ret = bch2_mark_replicas(c, &search.e);
-		if (ret)
-			return ret;
-	}
-
-	bch2_bkey_to_replicas(&search.e, k);
-
-	return bch2_mark_replicas(c, &search.e);
+	return __bch2_mark_bkey_replicas(c, k, false);
 }
 
 int bch2_replicas_gc_end(struct bch_fs *c, int ret)

fs/bcachefs/replicas.h

@@ -21,16 +21,12 @@ int bch2_replicas_entry_idx(struct bch_fs *,
 void bch2_devlist_to_replicas(struct bch_replicas_entry *,
 			      enum bch_data_type,
 			      struct bch_devs_list);
-bool bch2_replicas_marked(struct bch_fs *,
-			  struct bch_replicas_entry *, bool);
+bool bch2_replicas_marked(struct bch_fs *, struct bch_replicas_entry *);
 int bch2_mark_replicas(struct bch_fs *,
 		       struct bch_replicas_entry *);
 
-bool bch2_bkey_replicas_marked_locked(struct bch_fs *,
-				      struct bkey_s_c, bool);
 void bch2_bkey_to_replicas(struct bch_replicas_entry *, struct bkey_s_c);
-bool bch2_bkey_replicas_marked(struct bch_fs *,
-			       struct bkey_s_c, bool);
+bool bch2_bkey_replicas_marked(struct bch_fs *, struct bkey_s_c);
 int bch2_mark_bkey_replicas(struct bch_fs *, struct bkey_s_c);
 
 static inline void bch2_replicas_entry_cached(struct bch_replicas_entry *e,