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authorEric Paris <eparis@redhat.com>2009-12-17 21:24:25 -0500
committerEric Paris <eparis@redhat.com>2010-07-28 09:58:54 -0400
commitecf081d1a73b077916f514f2ec744ded32b88ca1 (patch)
treef1a9892131a297d0f67cb0fd9189e3aac83e2219 /include/linux/fs.h
parent35566087099c3ff8901d65ee98af56347ee66e5a (diff)
downloadop-kernel-dev-ecf081d1a73b077916f514f2ec744ded32b88ca1.zip
op-kernel-dev-ecf081d1a73b077916f514f2ec744ded32b88ca1.tar.gz
vfs: introduce FMODE_NONOTIFY
This is a new f_mode which can only be set by the kernel. It indicates that the fd was opened by fanotify and should not cause future fanotify events. This is needed to prevent fanotify livelock. An example of obvious livelock is from fanotify close events. Process A closes file1 This creates a close event for file1. fanotify opens file1 for Listener X Listener X deals with the event and closes its fd for file1. This creates a close event for file1. fanotify opens file1 for Listener X Listener X deals with the event and closes its fd for file1. This creates a close event for file1. fanotify opens file1 for Listener X Listener X deals with the event and closes its fd for file1. notice a pattern? The fix is to add the FMODE_NONOTIFY bit to the open filp done by the kernel for fanotify. Thus when that file is used it will not generate future events. This patch simply defines the bit. Signed-off-by: Eric Paris <eparis@redhat.com>
Diffstat (limited to 'include/linux/fs.h')
-rw-r--r--include/linux/fs.h6
1 files changed, 5 insertions, 1 deletions
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 85fe89c..50ef4d4 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -90,6 +90,9 @@ struct inodes_stat_t {
/* Expect random access pattern */
#define FMODE_RANDOM ((__force fmode_t)0x1000)
+/* File was opened by fanotify and shouldn't generate fanotify events */
+#define FMODE_NONOTIFY ((__force fmode_t)8388608)
+
/*
* The below are the various read and write types that we support. Some of
* them include behavioral modifiers that send information down to the
@@ -2508,7 +2511,8 @@ int proc_nr_files(struct ctl_table *table, int write,
int __init get_filesystem_list(char *buf);
#define ACC_MODE(x) ("\004\002\006\006"[(x)&O_ACCMODE])
-#define OPEN_FMODE(flag) ((__force fmode_t)((flag + 1) & O_ACCMODE))
+#define OPEN_FMODE(flag) ((__force fmode_t)(((flag + 1) & O_ACCMODE) | \
+ (flag & FMODE_NONOTIFY)))
#endif /* __KERNEL__ */
#endif /* _LINUX_FS_H */
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