ring-buffer: Allow splice to read previous partially read pages

If a page is partially read, and then the splice system call is run
against the ring buffer, it will always fail to read, no matter how much
is in the ring buffer. That's because the code path for a partial read of
the page does will fail if the "full" flag is set.

The splice system call wants full pages, so if the read of the ring buffer
is not yet full, it should return zero, and the splice will block. But if
a previous read was done, where the beginning has been consumed, it should
still be given to the splice caller if the rest of the page has been
written to.

This caused the splice command to never consume data in this scenario, and
let the ring buffer just fill up and lose events.

Link: https://lkml.kernel.org/r/20220927144317.46be6b80@gandalf.local.home
Cc: stable@vger.kernel.org
Fixes: 8789a9e7df6bf ("ring-buffer: read page interface")
Signed-off-by: Steven Rostedt (Google) <rostedt@goodmis.org>

diff --git a/kernel/trace/ring_buffer.c b/kernel/trace/ring_buffer.c
index d59b6a328b7feca1fa9cb947ed7c7e5d07cd22e2..6b145d48dfd1d91c2b1e09d7334e27d0b55154ab 100644 (file)
--- a/kernel/trace/ring_buffer.c
+++ b/kernel/trace/ring_buffer.c
@@ -5616,7 +5616,15 @@ int ring_buffer_read_page(struct trace_buffer *buffer,
                unsigned int pos = 0;
                unsigned int size;
 
-               if (full)
+               /*
+                * If a full page is expected, this can still be returned
+                * if there's been a previous partial read and the
+                * rest of the page can be read and the commit page is off
+                * the reader page.
+                */
+               if (full &&
+                   (!read || (len < (commit - read)) ||
+                    cpu_buffer->reader_page == cpu_buffer->commit_page))
                        goto out_unlock;
 
                if (len > (commit - read))