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

From: Eric Paris
Date: Fri Aug 28 2009 - 14:55:59 EST

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@xxxxxxxxxx>

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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