bcachefs: bch2_trans_log_str()

The data update path doesn't need a printbuf for its log message - this
will help reduce stack usage.

Signed-off-by: Kent Overstreet <[email protected]>

Author: Kent Overstreet

fs/bcachefs/btree_update.c

@@ -828,25 +828,35 @@ int bch2_btree_bit_mod_buffered(struct btree_trans *trans, enum btree_id btree,
 	return bch2_trans_update_buffered(trans, btree, &k);
 }
 
-int bch2_trans_log_msg(struct btree_trans *trans, struct printbuf *buf)
+static int __bch2_trans_log_str(struct btree_trans *trans, const char *str, unsigned len)
 {
-	unsigned u64s = DIV_ROUND_UP(buf->pos, sizeof(u64));
-
-	int ret = buf->allocation_failure ? -BCH_ERR_ENOMEM_trans_log_msg : 0;
-	if (ret)
-		return ret;
+	unsigned u64s = DIV_ROUND_UP(len, sizeof(u64));
 
 	struct jset_entry *e = bch2_trans_jset_entry_alloc(trans, jset_u64s(u64s));
-	ret = PTR_ERR_OR_ZERO(e);
+	int ret = PTR_ERR_OR_ZERO(e);
 	if (ret)
 		return ret;
 
 	struct jset_entry_log *l = container_of(e, struct jset_entry_log, entry);
 	journal_entry_init(e, BCH_JSET_ENTRY_log, 0, 1, u64s);
-	memcpy_and_pad(l->d, u64s * sizeof(u64), buf->buf, buf->pos, 0);
+	memcpy_and_pad(l->d, u64s * sizeof(u64), str, len, 0);
 	return 0;
 }
 
+int bch2_trans_log_str(struct btree_trans *trans, const char *str)
+{
+	return __bch2_trans_log_str(trans, str, strlen(str));
+}
+
+int bch2_trans_log_msg(struct btree_trans *trans, struct printbuf *buf)
+{
+	int ret = buf->allocation_failure ? -BCH_ERR_ENOMEM_trans_log_msg : 0;
+	if (ret)
+		return ret;
+
+	return __bch2_trans_log_str(trans, buf->buf, buf->pos);
+}
+
 int bch2_trans_log_bkey(struct btree_trans *trans, enum btree_id btree,
 			unsigned level, struct bkey_i *k)
 {

fs/bcachefs/btree_update.h

@@ -205,6 +205,7 @@ void bch2_trans_commit_hook(struct btree_trans *,
 			    struct btree_trans_commit_hook *);
 int __bch2_trans_commit(struct btree_trans *, unsigned);
 
+int bch2_trans_log_str(struct btree_trans *, const char *);
 int bch2_trans_log_msg(struct btree_trans *, struct printbuf *);
 int bch2_trans_log_bkey(struct btree_trans *, enum btree_id, unsigned, struct bkey_i *);