bcachefs: fix bch2_val_to_text()

was returning wrong value
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/alloc.c

@@ -154,7 +154,7 @@ const char *bch2_alloc_invalid(const struct bch_fs *c, struct bkey_s_c k)
 	return NULL;
 }
 
-void bch2_alloc_to_text(struct bch_fs *c, char *buf,
+int bch2_alloc_to_text(struct bch_fs *c, char *buf,
 		       size_t size, struct bkey_s_c k)
 {
 	buf[0] = '\0';
@@ -163,6 +163,8 @@ void bch2_alloc_to_text(struct bch_fs *c, char *buf,
 	case BCH_ALLOC:
 		break;
 	}
+
+	return 0;
 }
 
 static inline unsigned get_alloc_field(const u8 **p, unsigned bytes)
@@ -2067,6 +2069,8 @@ static int __bch2_fs_allocator_start(struct bch_fs *c)
 	 * invalidated on disk:
 	 */
 	if (invalidating_data) {
+		BUG();
+		pr_info("holding writes");
 		pr_debug("invalidating existing data");
 		set_bit(BCH_FS_HOLD_BTREE_WRITES, &c->flags);
 	} else {

fs/bcachefs/alloc.h

@@ -12,7 +12,7 @@ struct bch_devs_List;
 #define ALLOC_SCAN_BATCH(ca)		((ca)->mi.nbuckets >> 9)
 
 const char *bch2_alloc_invalid(const struct bch_fs *, struct bkey_s_c);
-void bch2_alloc_to_text(struct bch_fs *, char *, size_t, struct bkey_s_c);
+int bch2_alloc_to_text(struct bch_fs *, char *, size_t, struct bkey_s_c);
 
 #define bch2_bkey_alloc_ops (struct bkey_ops) {		\
 	.key_invalid	= bch2_alloc_invalid,		\

fs/bcachefs/bkey_methods.c

@@ -123,16 +123,27 @@ void bch2_bkey_debugcheck(struct bch_fs *c, struct btree *b, struct bkey_s_c k)
 
 #define p(...)	(out += scnprintf(out, end - out, __VA_ARGS__))
 
+int bch2_bpos_to_text(char *buf, size_t size, struct bpos pos)
+{
+	char *out = buf, *end = buf + size;
+
+	if (!bkey_cmp(pos, POS_MIN))
+		p("POS_MIN");
+	else if (!bkey_cmp(pos, POS_MAX))
+		p("POS_MAX");
+	else
+		p("%llu:%llu", pos.inode, pos.offset);
+
+	return out - buf;
+}
+
 int bch2_bkey_to_text(char *buf, size_t size, const struct bkey *k)
 {
 	char *out = buf, *end = buf + size;
 
 	p("u64s %u type %u ", k->u64s, k->type);
 
-	if (bkey_cmp(k->p, POS_MAX))
-		p("%llu:%llu", k->p.inode, k->p.offset);
-	else
-		p("POS_MAX");
+	out += bch2_bpos_to_text(out, end - out, k->p);
 
 	p(" snap %u len %u ver %llu", k->p.snapshot, k->size, k->version.lo);
 
@@ -160,7 +171,7 @@ int bch2_val_to_text(struct bch_fs *c, enum bkey_type type,
 		break;
 	default:
 		if (k.k->type >= KEY_TYPE_GENERIC_NR && ops->val_to_text)
-			ops->val_to_text(c, buf, size, k);
+			out += ops->val_to_text(c, out, end - out, k);
 		break;
 	}
 

fs/bcachefs/bkey_methods.h

@@ -57,7 +57,7 @@ struct bkey_ops {
 				       struct bkey_s_c);
 	void		(*key_debugcheck)(struct bch_fs *, struct btree *,
 					  struct bkey_s_c);
-	void		(*val_to_text)(struct bch_fs *, char *,
+	int		(*val_to_text)(struct bch_fs *, char *,
 				       size_t, struct bkey_s_c);
 	void		(*swab)(const struct bkey_format *, struct bkey_packed *);
 	key_filter_fn	key_normalize;
@@ -73,6 +73,7 @@ const char *bch2_bkey_in_btree_node(struct btree *, struct bkey_s_c);
 
 void bch2_bkey_debugcheck(struct bch_fs *, struct btree *, struct bkey_s_c);
 
+int bch2_bpos_to_text(char *, size_t, struct bpos);
 int bch2_bkey_to_text(char *, size_t, const struct bkey *);
 int bch2_val_to_text(struct bch_fs *, enum bkey_type,
 		     char *, size_t, struct bkey_s_c);

fs/bcachefs/dirent.c

@@ -122,24 +122,26 @@ const char *bch2_dirent_invalid(const struct bch_fs *c, struct bkey_s_c k)
 	}
 }
 
-void bch2_dirent_to_text(struct bch_fs *c, char *buf,
+int bch2_dirent_to_text(struct bch_fs *c, char *buf,
 			size_t size, struct bkey_s_c k)
 {
+	char *out = buf, *end = buf + size;
 	struct bkey_s_c_dirent d;
-	size_t n = 0;
 
 	switch (k.k->type) {
 	case BCH_DIRENT:
 		d = bkey_s_c_to_dirent(k);
 
-		n += bch_scnmemcpy(buf + n, size - n, d.v->d_name,
+		out += bch_scnmemcpy(out, end - out, d.v->d_name,
 				     bch2_dirent_name_bytes(d));
-		n += scnprintf(buf + n, size - n, " -> %llu", d.v->d_inum);
+		out += scnprintf(out, end - out, " -> %llu", d.v->d_inum);
 		break;
 	case BCH_DIRENT_WHITEOUT:
-		scnprintf(buf, size, "whiteout");
+		out += scnprintf(out, end - out, "whiteout");
 		break;
 	}
+
+	return out - buf;
 }
 
 static struct bkey_i_dirent *dirent_create_key(struct btree_trans *trans,

fs/bcachefs/dirent.h

@@ -7,7 +7,7 @@
 extern const struct bch_hash_desc bch2_dirent_hash_desc;
 
 const char *bch2_dirent_invalid(const struct bch_fs *, struct bkey_s_c);
-void bch2_dirent_to_text(struct bch_fs *, char *, size_t, struct bkey_s_c);
+int bch2_dirent_to_text(struct bch_fs *, char *, size_t, struct bkey_s_c);
 
 #define bch2_bkey_dirent_ops (struct bkey_ops) {	\
 	.key_invalid	= bch2_dirent_invalid,		\

fs/bcachefs/extents.c

@@ -733,7 +733,7 @@ void bch2_btree_ptr_debugcheck(struct bch_fs *c, struct btree *b,
 		      mark.gen, (unsigned) mark.v.counter);
 }
 
-void bch2_btree_ptr_to_text(struct bch_fs *c, char *buf,
+int bch2_btree_ptr_to_text(struct bch_fs *c, char *buf,
 			   size_t size, struct bkey_s_c k)
 {
 	char *out = buf, *end = buf + size;
@@ -748,6 +748,7 @@ void bch2_btree_ptr_to_text(struct bch_fs *c, char *buf,
 	if (invalid)
 		p(" invalid: %s", invalid);
 #undef p
+	return out - buf;
 }
 
 int bch2_btree_pick_ptr(struct bch_fs *c, const struct btree *b,
@@ -1877,7 +1878,7 @@ void bch2_extent_debugcheck(struct bch_fs *c, struct btree *b, struct bkey_s_c k
 	}
 }
 
-void bch2_extent_to_text(struct bch_fs *c, char *buf,
+int bch2_extent_to_text(struct bch_fs *c, char *buf,
 			size_t size, struct bkey_s_c k)
 {
 	char *out = buf, *end = buf + size;
@@ -1892,6 +1893,7 @@ void bch2_extent_to_text(struct bch_fs *c, char *buf,
 	if (invalid)
 		p(" invalid: %s", invalid);
 #undef p
+	return out - buf;
 }
 
 static void bch2_extent_crc_init(union bch_extent_crc *crc,

fs/bcachefs/extents.h

@@ -19,7 +19,7 @@ union bch_extent_crc;
 const char *bch2_btree_ptr_invalid(const struct bch_fs *, struct bkey_s_c);
 void bch2_btree_ptr_debugcheck(struct bch_fs *, struct btree *,
 			       struct bkey_s_c);
-void bch2_btree_ptr_to_text(struct bch_fs *, char *, size_t, struct bkey_s_c);
+int bch2_btree_ptr_to_text(struct bch_fs *, char *, size_t, struct bkey_s_c);
 void bch2_ptr_swab(const struct bkey_format *, struct bkey_packed *);
 
 #define bch2_bkey_btree_ops (struct bkey_ops) {			\
@@ -31,7 +31,7 @@ void bch2_ptr_swab(const struct bkey_format *, struct bkey_packed *);
 
 const char *bch2_extent_invalid(const struct bch_fs *, struct bkey_s_c);
 void bch2_extent_debugcheck(struct bch_fs *, struct btree *, struct bkey_s_c);
-void bch2_extent_to_text(struct bch_fs *, char *, size_t, struct bkey_s_c);
+int bch2_extent_to_text(struct bch_fs *, char *, size_t, struct bkey_s_c);
 bool bch2_ptr_normalize(struct bch_fs *, struct btree *, struct bkey_s);
 enum merge_result bch2_extent_merge(struct bch_fs *, struct btree *,
 				    struct bkey_i *, struct bkey_i *);

fs/bcachefs/inode.c

@@ -228,7 +228,7 @@ const char *bch2_inode_invalid(const struct bch_fs *c, struct bkey_s_c k)
 	}
 }
 
-void bch2_inode_to_text(struct bch_fs *c, char *buf,
+int bch2_inode_to_text(struct bch_fs *c, char *buf,
 		       size_t size, struct bkey_s_c k)
 {
 	char *out = buf, *end = out + size;
@@ -249,6 +249,8 @@ void bch2_inode_to_text(struct bch_fs *c, char *buf,
 #undef  BCH_INODE_FIELD
 		break;
 	}
+
+	return out - buf;
 }
 
 void bch2_inode_init(struct bch_fs *c, struct bch_inode_unpacked *inode_u,

fs/bcachefs/inode.h

@@ -7,7 +7,7 @@
 #include <linux/math64.h>
 
 const char *bch2_inode_invalid(const struct bch_fs *, struct bkey_s_c);
-void bch2_inode_to_text(struct bch_fs *, char *, size_t, struct bkey_s_c);
+int bch2_inode_to_text(struct bch_fs *, char *, size_t, struct bkey_s_c);
 
 #define bch2_bkey_inode_ops (struct bkey_ops) {		\
 	.key_invalid	= bch2_inode_invalid,		\

fs/bcachefs/quota.c

@@ -46,10 +46,10 @@ static const char * const bch2_quota_counters[] = {
 	"inodes",
 };
 
-void bch2_quota_to_text(struct bch_fs *c, char *buf,
+int bch2_quota_to_text(struct bch_fs *c, char *buf,
 		       size_t size, struct bkey_s_c k)
 {
-	char *out = buf, *end= buf + size;
+	char *out = buf, *end = buf + size;
 	struct bkey_s_c_quota dq;
 	unsigned i;
 
@@ -64,6 +64,8 @@ void bch2_quota_to_text(struct bch_fs *c, char *buf,
 					 le64_to_cpu(dq.v->c[i].softlimit));
 		break;
 	}
+
+	return out - buf;
 }
 
 #ifdef CONFIG_BCACHEFS_QUOTA

fs/bcachefs/quota.h

@@ -8,7 +8,7 @@
 extern const struct bch_sb_field_ops bch_sb_field_ops_quota;
 
 const char *bch2_quota_invalid(const struct bch_fs *, struct bkey_s_c);
-void bch2_quota_to_text(struct bch_fs *, char *, size_t, struct bkey_s_c);
+int bch2_quota_to_text(struct bch_fs *, char *, size_t, struct bkey_s_c);
 
 #define bch2_bkey_quota_ops (struct bkey_ops) {		\
 	.key_invalid	= bch2_quota_invalid,		\

fs/bcachefs/xattr.c

@@ -111,12 +111,12 @@ const char *bch2_xattr_invalid(const struct bch_fs *c, struct bkey_s_c k)
 	}
 }
 
-void bch2_xattr_to_text(struct bch_fs *c, char *buf,
+int bch2_xattr_to_text(struct bch_fs *c, char *buf,
 		       size_t size, struct bkey_s_c k)
 {
+	char *out = buf, *end = buf + size;
 	const struct xattr_handler *handler;
 	struct bkey_s_c_xattr xattr;
-	size_t n = 0;
 
 	switch (k.k->type) {
 	case BCH_XATTR:
@@ -124,24 +124,26 @@ void bch2_xattr_to_text(struct bch_fs *c, char *buf,
 
 		handler = bch2_xattr_type_to_handler(xattr.v->x_type);
 		if (handler && handler->prefix)
-			n += scnprintf(buf + n, size - n, "%s", handler->prefix);
+			out += scnprintf(out, end - out, "%s", handler->prefix);
 		else if (handler)
-			n += scnprintf(buf + n, size - n, "(type %u)",
+			out += scnprintf(out, end - out, "(type %u)",
 					 xattr.v->x_type);
 		else
-			n += scnprintf(buf + n, size - n, "(unknown type %u)",
+			out += scnprintf(out, end - out, "(unknown type %u)",
 					 xattr.v->x_type);
 
-		n += bch_scnmemcpy(buf + n, size - n, xattr.v->x_name,
+		out += bch_scnmemcpy(out, end - out, xattr.v->x_name,
 				     xattr.v->x_name_len);
-		n += scnprintf(buf + n, size - n, ":");
-		n += bch_scnmemcpy(buf + n, size - n, xattr_val(xattr.v),
+		out += scnprintf(out, end - out, ":");
+		out += bch_scnmemcpy(out, end - out, xattr_val(xattr.v),
 				     le16_to_cpu(xattr.v->x_val_len));
 		break;
 	case BCH_XATTR_WHITEOUT:
-		scnprintf(buf, size, "whiteout");
+		out += scnprintf(out, end - out, "whiteout");
 		break;
 	}
+
+	return out - buf;
 }
 
 int bch2_xattr_get(struct bch_fs *c, struct bch_inode_info *inode,

fs/bcachefs/xattr.h

@@ -7,7 +7,7 @@
 extern const struct bch_hash_desc bch2_xattr_hash_desc;
 
 const char *bch2_xattr_invalid(const struct bch_fs *, struct bkey_s_c);
-void bch2_xattr_to_text(struct bch_fs *, char *, size_t, struct bkey_s_c);
+int bch2_xattr_to_text(struct bch_fs *, char *, size_t, struct bkey_s_c);
 
 #define bch2_bkey_xattr_ops (struct bkey_ops) {		\
 	.key_invalid	= bch2_xattr_invalid,		\