seq_file: Add seq_vprintf function and export it
The existing seq_printf function is rewritten in terms of the new
seq_vprintf which is also exported to modules. This allows GFS2
(and potentially other seq_file users) to have a vprintf based
interface and to avoid an extra copy into a temporary buffer in
some cases.
Signed-off-by: Steven Whitehouse <swhiteho@redhat.com>
Reported-by: Eric Dumazet <eric.dumazet@gmail.com>
Acked-by: Al Viro <viro@ZenIV.linux.org.uk>
diff --git a/fs/seq_file.c b/fs/seq_file.c
index 0cbd049..14cf9de 100644
--- a/fs/seq_file.c
+++ b/fs/seq_file.c
@@ -385,15 +385,12 @@
}
EXPORT_SYMBOL(seq_escape);
-int seq_printf(struct seq_file *m, const char *f, ...)
+int seq_vprintf(struct seq_file *m, const char *f, va_list args)
{
- va_list args;
int len;
if (m->count < m->size) {
- va_start(args, f);
len = vsnprintf(m->buf + m->count, m->size - m->count, f, args);
- va_end(args);
if (m->count + len < m->size) {
m->count += len;
return 0;
@@ -402,6 +399,19 @@
seq_set_overflow(m);
return -1;
}
+EXPORT_SYMBOL(seq_vprintf);
+
+int seq_printf(struct seq_file *m, const char *f, ...)
+{
+ int ret;
+ va_list args;
+
+ va_start(args, f);
+ ret = seq_vprintf(m, f, args);
+ va_end(args);
+
+ return ret;
+}
EXPORT_SYMBOL(seq_printf);
/**