bcachefs: vstruct_for_each() now declares loop iter

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

fs/bcachefs/journal.h

@@ -238,8 +238,6 @@ bch2_journal_add_entry(struct journal *j, struct journal_res *res,
 
 static inline bool journal_entry_empty(struct jset *j)
 {
-	struct jset_entry *i;
-
 	if (j->seq != j->last_seq)
 		return false;
 

fs/bcachefs/journal_io.c

@@ -783,7 +783,6 @@ void bch2_journal_entry_to_text(struct printbuf *out, struct bch_fs *c,
 static int jset_validate_entries(struct bch_fs *c, struct jset *jset,
 				 enum bkey_invalid_flags flags)
 {
-	struct jset_entry *entry;
 	unsigned version = le32_to_cpu(jset->version);
 	int ret = 0;
 
@@ -1723,7 +1722,7 @@ static CLOSURE_CALLBACK(do_journal_write)
 static int bch2_journal_write_prep(struct journal *j, struct journal_buf *w)
 {
 	struct bch_fs *c = container_of(j, struct bch_fs, journal);
-	struct jset_entry *start, *end, *i;
+	struct jset_entry *start, *end;
 	struct jset *jset = w->data;
 	struct journal_keys_to_wb wb = { NULL };
 	unsigned sectors, bytes, u64s;

fs/bcachefs/recovery.c

@@ -344,14 +344,11 @@ static int journal_replay_entry_early(struct bch_fs *c,
 static int journal_replay_early(struct bch_fs *c,
 				struct bch_sb_field_clean *clean)
 {
-	struct jset_entry *entry;
-	int ret;
-
 	if (clean) {
-		for (entry = clean->start;
+		for (struct jset_entry *entry = clean->start;
 		     entry != vstruct_end(&clean->field);
 		     entry = vstruct_next(entry)) {
-			ret = journal_replay_entry_early(c, entry);
+			int ret = journal_replay_entry_early(c, entry);
 			if (ret)
 				return ret;
 		}
@@ -366,7 +363,7 @@ static int journal_replay_early(struct bch_fs *c,
 				continue;
 
 			vstruct_for_each(&i->j, entry) {
-				ret = journal_replay_entry_early(c, entry);
+				int ret = journal_replay_entry_early(c, entry);
 				if (ret)
 					return ret;
 			}

fs/bcachefs/super-io.c

@@ -101,8 +101,6 @@ static int bch2_sb_field_validate(struct bch_sb *, struct bch_sb_field *,
 struct bch_sb_field *bch2_sb_field_get_id(struct bch_sb *sb,
 				      enum bch_sb_field_type type)
 {
-	struct bch_sb_field *f;
-
 	/* XXX: need locking around superblock to access optional fields */
 
 	vstruct_for_each(sb, f)
@@ -366,7 +364,6 @@ static int bch2_sb_validate(struct bch_sb_handle *disk_sb, struct printbuf *out,
 			    int rw)
 {
 	struct bch_sb *sb = disk_sb->sb;
-	struct bch_sb_field *f;
 	struct bch_sb_field_members_v1 *mi;
 	enum bch_opt_id opt_id;
 	u16 block_size;
@@ -1250,7 +1247,6 @@ void bch2_sb_layout_to_text(struct printbuf *out, struct bch_sb_layout *l)
 void bch2_sb_to_text(struct printbuf *out, struct bch_sb *sb,
 		     bool print_layout, unsigned fields)
 {
-	struct bch_sb_field *f;
 	u64 fields_have = 0;
 	unsigned nr_devices = 0;
 

fs/bcachefs/vstructs.h

@@ -48,14 +48,14 @@
 	((void *)			((u64 *) (_s)->_data + __vstruct_u64s(_s)))
 
 #define vstruct_for_each(_s, _i)					\
-	for (_i = (_s)->start;						\
+	for (typeof(&(_s)->start[0]) _i = (_s)->start;			\
 	     _i < vstruct_last(_s);					\
 	     _i = vstruct_next(_i))
 
-#define vstruct_for_each_safe(_s, _i, _t)				\
-	for (_i = (_s)->start;						\
-	     _i < vstruct_last(_s) && (_t = vstruct_next(_i), true);	\
-	     _i = _t)
+#define vstruct_for_each_safe(_s, _i)					\
+	for (typeof(&(_s)->start[0]) _next, _i = (_s)->start;		\
+	     _i < vstruct_last(_s) && (_next = vstruct_next(_i), true);	\
+	     _i = _next)
 
 #define vstruct_idx(_s, _idx)						\
 	((typeof(&(_s)->start[0])) ((_s)->_data + (_idx)))