From 33af5e32e0bb73c704b5e156f4411cdb53e6cc59 Mon Sep 17 00:00:00 2001
From: Eric Paris <eparis@redhat.com>
Date: Thu, 17 Dec 2009 21:24:33 -0500
Subject: [PATCH] fsnotify: ignored_mask - excluding notification
The ignored_mask is a new mask which is part of fsnotify marks. A group's
should_send_event() function can use the ignored mask to determine that
certain events are not of interest. In particular if a group registers a
mask including FS_OPEN on a vfsmount they could add FS_OPEN to the
ignored_mask for individual inodes and not send open events for those
inodes.
Signed-off-by: Eric Paris <eparis@redhat.com>
---
fs/notify/mark.c | 6 ++++++
include/linux/fsnotify_backend.h | 3 +++
2 files changed, 9 insertions(+)
diff --git a/fs/notify/mark.c b/fs/notify/mark.c
index 0ebc3fd7089bb..cb1d822f227fe 100644
--- a/fs/notify/mark.c
+++ b/fs/notify/mark.c
@@ -190,6 +190,12 @@ void fsnotify_set_mark_mask_locked(struct fsnotify_mark *mark, __u32 mask)
fsnotify_set_inode_mark_mask_locked(mark, mask);
}
+void fsnotify_set_mark_ignored_mask_locked(struct fsnotify_mark *mark, __u32 mask)
+{
+ assert_spin_locked(&mark->lock);
+
+ mark->ignored_mask = mask;
+}
/*
* Attach an initialized mark to a given group and fs object.
diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h
index 489c881ed4ec4..018416ec5ce40 100644
--- a/include/linux/fsnotify_backend.h
+++ b/include/linux/fsnotify_backend.h
@@ -266,6 +266,7 @@ struct fsnotify_mark {
struct fsnotify_inode_mark i;
struct fsnotify_vfsmount_mark m;
};
+ __u32 ignored_mask; /* events types to ignore */
struct list_head free_g_list; /* tmp list used when freeing this mark */
#define FSNOTIFY_MARK_FLAG_INODE 0x01
#define FSNOTIFY_MARK_FLAG_VFSMOUNT 0x02
@@ -373,6 +374,8 @@ extern struct fsnotify_mark *fsnotify_find_inode_mark(struct fsnotify_group *gro
extern struct fsnotify_mark *fsnotify_find_vfsmount_mark(struct fsnotify_group *group, struct vfsmount *mnt);
/* copy the values from old into new */
extern void fsnotify_duplicate_mark(struct fsnotify_mark *new, struct fsnotify_mark *old);
+/* set the ignored_mask of a mark */
+extern void fsnotify_set_mark_ignored_mask_locked(struct fsnotify_mark *mark, __u32 mask);
/* set the mask of a mark (might pin the object into memory */
extern void fsnotify_set_mark_mask_locked(struct fsnotify_mark *mark, __u32 mask);
/* attach the mark to both the group and the inode */
--
2.30.2