netdev - [PATCH 1/9] task_struct: add PF_NONOTIFY for fanotify to use

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Message-ID: <20090828185542.8014.22791.stgit@paris.rdu.redhat.com>
Date:	Fri, 28 Aug 2009 14:55:42 -0400
From:	Eric Paris <eparis@...hat.com>
To:	linux-kernel@...r.kernel.org, linux-fsdevel@...r.kernel.org,
	netdev@...r.kernel.org
Cc:	davem@...emloft.net, viro@...iv.linux.org.uk, alan@...ux.intel.com,
	hch@...radead.org
Subject: [PATCH 1/9] task_struct: add PF_NONOTIFY for fanotify to use

Since fanotify opens file descriptors inside the kernel for it's listeners
it needs a way to make sure that 2 fanotify listeners, both which listen to
open events do not continuously see each others open events (and get into a
livelock reporting on each other's activity).  This fix is to create a new
tast_struct flags called PF_NONOTIFY.  If this flag is set in a task no
fanotify events will be generated for that task.   fanotify will set the
flag before and open call and will clear it immediately after.

Signed-off-by: Eric Paris <eparis@...hat.com>
---

 include/linux/sched.h |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/include/linux/sched.h b/include/linux/sched.h
index b88872f..3c1ce66 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1695,6 +1695,7 @@ extern cputime_t task_gtime(struct task_struct *p);
 #define PF_EXITING	0x00000004	/* getting shut down */
 #define PF_EXITPIDONE	0x00000008	/* pi exit done on shut down */
 #define PF_VCPU		0x00000010	/* I'm a virtual CPU */
+#define PF_NONOTIFY	0x00000020	/* In fanotify open operation */
 #define PF_FORKNOEXEC	0x00000040	/* forked but didn't exec */
 #define PF_MCE_PROCESS  0x00000080      /* process policy on mce errors */
 #define PF_SUPERPRIV	0x00000100	/* used super-user privileges */

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