From: Steven Rostedt <srostedt@redhat.com>
Date: Thu, 23 Jul 2009 03:29:30 +0000 (-0400)
Subject: tracing: only truncate ftrace files when O_TRUNC is set
X-Git-Tag: v2.6.31-rc6~77^2~4
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=8650ae32ef7045e763825dee6256dde7f331bb85;p=pandora-kernel.git

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>
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