commit 8650ae32ef7045e763825dee6256dde7f331bb85
author Steven Rostedt <srostedt@redhat.com> Wed Jul 22 23:29:30 2009 -0400
committer Steven Rostedt <rostedt@goodmis.org> Thu Jul 23 10:07:18 2009 -0400
tree 546a07e4c5b6fc731b48604769392a671c1fb18e
parent 4c739ff043e5787d97c9691d62cabf7a29e75a9d

tracing: only truncate ftrace files when O_TRUNC is set

The current code will truncate the ftrace files contents if O_APPEND
is not set and the file is opened in write mode. This is incorrect.
It should only truncate the file if O_TRUNC is set. Otherwise
if one of these files is opened by a C program with fopen "r+",
it will incorrectly truncate the file.

Reported-by: Jiri Olsa <jolsa@redhat.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>