bcachefs: bch2_printbuf_strip_trailing_newline()

Add a new helper to fix inode_to_text()
Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>

fs/bcachefs/inode.c

@@ -551,6 +551,8 @@ static void __bch2_inode_unpacked_to_text(struct printbuf *out,
 	prt_printf(out, #_name "=%llu\n", (u64) inode->_name);
 	BCH_INODE_FIELDS_v3()
 #undef  x
+
+	bch2_printbuf_strip_trailing_newline(out);
 	printbuf_indent_sub(out, 2);
 }
 

fs/bcachefs/printbuf.c

@@ -316,6 +316,20 @@ void bch2_prt_newline(struct printbuf *buf)
 	buf->cur_tabstop	= 0;
 }
 
+void bch2_printbuf_strip_trailing_newline(struct printbuf *out)
+{
+	for (int p = out->pos - 1; p >= 0; --p) {
+		if (out->buf[p] == '\n') {
+			out->pos = p;
+			break;
+		}
+		if (out->buf[p] != ' ')
+			break;
+	}
+
+	printbuf_nul_terminate_reserved(out);
+}
+
 static void __prt_tab(struct printbuf *out)
 {
 	int spaces = max_t(int, 0, cur_tabstop(out) - printbuf_linelen(out));

fs/bcachefs/printbuf.h

@@ -115,6 +115,7 @@ void bch2_printbuf_indent_add(struct printbuf *, unsigned);
 void bch2_printbuf_indent_sub(struct printbuf *, unsigned);
 
 void bch2_prt_newline(struct printbuf *);
+void bch2_printbuf_strip_trailing_newline(struct printbuf *);
 void bch2_prt_tab(struct printbuf *);
 void bch2_prt_tab_rjust(struct printbuf *);