[PATCH] inotify (3/5): add interfaces to kernel API

Add inotify_init_watch() so caller can use inotify_watch refcounts
before calling inotify_add_watch().

Add inotify_find_watch() to find an existing watch for an (ih,inode)
pair.  This is similar to inotify_find_update_watch(), but does not
update the watch's mask if one is found.

Add inotify_rm_watch() to remove a watch via the watch pointer instead
of the watch descriptor.

Signed-off-by: Amy Griffis <amy.griffis@hp.com>
Acked-by: Robert Love <rml@novell.com>
Acked-by: John McCutchan <john@johnmccutchan.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 20 insertions, 0 deletions

diff --git a/include/linux/inotify.h b/include/linux/inotify.h
index e7899e7d83ad..e7e7fb7fc778 100644
--- a/include/linux/inotify.h
+++ b/include/linux/inotify.h
@@ -112,11 +112,15 @@ extern u32 inotify_get_cookie(void);
 /* Kernel Consumer API */
 
 extern struct inotify_handle *inotify_init(const struct inotify_operations *);
+extern void inotify_init_watch(struct inotify_watch *);
 extern void inotify_destroy(struct inotify_handle *);
+extern __s32 inotify_find_watch(struct inotify_handle *, struct inode *,
+                                struct inotify_watch **);
 extern __s32 inotify_find_update_watch(struct inotify_handle *, struct inode *,
                                        u32);
 extern __s32 inotify_add_watch(struct inotify_handle *, struct inotify_watch *,
                                struct inode *, __u32);
+extern int inotify_rm_watch(struct inotify_handle *, struct inotify_watch *);
 extern int inotify_rm_wd(struct inotify_handle *, __u32);
 extern void get_inotify_watch(struct inotify_watch *);
 extern void put_inotify_watch(struct inotify_watch *);
@@ -163,10 +167,20 @@ static inline struct inotify_handle *inotify_init(const struct inotify_operation
         return ERR_PTR(-EOPNOTSUPP);
 }
 
+static inline void inotify_init_watch(struct inotify_watch *watch)
+{
+}
+
 static inline void inotify_destroy(struct inotify_handle *ih)
 {
 }
 
+static inline __s32 inotify_find_watch(struct inotify_handle *ih, struct inode *inode,
+                                       struct inotify_watch **watchp)
+{
+        return -EOPNOTSUPP;
+}
+
 static inline __s32 inotify_find_update_watch(struct inotify_handle *ih,
                                               struct inode *inode, u32 mask)
 {
@@ -180,6 +194,12 @@ static inline __s32 inotify_add_watch(struct inotify_handle *ih,
         return -EOPNOTSUPP;
 }
 
+static inline int inotify_rm_watch(struct inotify_handle *ih,
+                                   struct inotify_watch *watch)
+{
+        return -EOPNOTSUPP;
+}
+
 static inline int inotify_rm_wd(struct inotify_handle *ih, __u32 wd)
 {
         return -EOPNOTSUPP;