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authorAmy Griffis <amy.griffis@hp.com>2006-06-01 13:11:03 -0700
committerAl Viro <viro@zeniv.linux.org.uk>2006-06-20 05:25:18 -0400
commita9dc971d3fdb857a2bcd6d53238125a2cd31d5f4 (patch)
tree02e8816f583b5ca40da5789ab9e8d7de9b3ed598
parent[PATCH] inotify (2/5): add name's inode to event handler (diff)
downloadlinux-dev-a9dc971d3fdb857a2bcd6d53238125a2cd31d5f4.tar.xz
linux-dev-a9dc971d3fdb857a2bcd6d53238125a2cd31d5f4.zip
[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>
-rw-r--r--fs/inotify.c64
-rw-r--r--fs/inotify_user.c1
-rw-r--r--include/linux/inotify.h20
3 files changed, 79 insertions, 6 deletions
diff --git a/fs/inotify.c b/fs/inotify.c
index f25c21801fdc..8477c4fbecb4 100644
--- a/fs/inotify.c
+++ b/fs/inotify.c
@@ -468,6 +468,19 @@ struct inotify_handle *inotify_init(const struct inotify_operations *ops)
EXPORT_SYMBOL_GPL(inotify_init);
/**
+ * inotify_init_watch - initialize an inotify watch
+ * @watch: watch to initialize
+ */
+void inotify_init_watch(struct inotify_watch *watch)
+{
+ INIT_LIST_HEAD(&watch->h_list);
+ INIT_LIST_HEAD(&watch->i_list);
+ atomic_set(&watch->count, 0);
+ get_inotify_watch(watch); /* initial get */
+}
+EXPORT_SYMBOL_GPL(inotify_init_watch);
+
+/**
* inotify_destroy - clean up and destroy an inotify instance
* @ih: inotify handle
*/
@@ -515,6 +528,37 @@ void inotify_destroy(struct inotify_handle *ih)
EXPORT_SYMBOL_GPL(inotify_destroy);
/**
+ * inotify_find_watch - find an existing watch for an (ih,inode) pair
+ * @ih: inotify handle
+ * @inode: inode to watch
+ * @watchp: pointer to existing inotify_watch
+ *
+ * Caller must pin given inode (via nameidata).
+ */
+s32 inotify_find_watch(struct inotify_handle *ih, struct inode *inode,
+ struct inotify_watch **watchp)
+{
+ struct inotify_watch *old;
+ int ret = -ENOENT;
+
+ mutex_lock(&inode->inotify_mutex);
+ mutex_lock(&ih->mutex);
+
+ old = inode_find_handle(inode, ih);
+ if (unlikely(old)) {
+ get_inotify_watch(old); /* caller must put watch */
+ *watchp = old;
+ ret = old->wd;
+ }
+
+ mutex_unlock(&ih->mutex);
+ mutex_unlock(&inode->inotify_mutex);
+
+ return ret;
+}
+EXPORT_SYMBOL_GPL(inotify_find_watch);
+
+/**
* inotify_find_update_watch - find and update the mask of an existing watch
* @ih: inotify handle
* @inode: inode's watch to update
@@ -593,10 +637,6 @@ s32 inotify_add_watch(struct inotify_handle *ih, struct inotify_watch *watch,
goto out;
ret = watch->wd;
- atomic_set(&watch->count, 0);
- INIT_LIST_HEAD(&watch->h_list);
- INIT_LIST_HEAD(&watch->i_list);
-
/* save a reference to handle and bump the count to make it official */
get_inotify_handle(ih);
watch->ih = ih;
@@ -607,8 +647,6 @@ s32 inotify_add_watch(struct inotify_handle *ih, struct inotify_watch *watch,
*/
watch->inode = igrab(inode);
- get_inotify_watch(watch); /* initial get */
-
if (!inotify_inode_watched(inode))
set_dentry_child_flags(inode, 1);
@@ -659,6 +697,20 @@ int inotify_rm_wd(struct inotify_handle *ih, u32 wd)
}
EXPORT_SYMBOL_GPL(inotify_rm_wd);
+/**
+ * inotify_rm_watch - remove a watch from an inotify instance
+ * @ih: inotify handle
+ * @watch: watch to remove
+ *
+ * Can sleep.
+ */
+int inotify_rm_watch(struct inotify_handle *ih,
+ struct inotify_watch *watch)
+{
+ return inotify_rm_wd(ih, watch->wd);
+}
+EXPORT_SYMBOL_GPL(inotify_rm_watch);
+
/*
* inotify_setup - core initialization function
*/
diff --git a/fs/inotify_user.c b/fs/inotify_user.c
index 8b83c7190067..9e9931e2badd 100644
--- a/fs/inotify_user.c
+++ b/fs/inotify_user.c
@@ -380,6 +380,7 @@ static int create_watch(struct inotify_device *dev, struct inode *inode,
atomic_inc(&dev->user->inotify_watches);
+ inotify_init_watch(&watch->wdata);
ret = inotify_add_watch(dev->ih, &watch->wdata, inode, mask);
if (ret < 0)
free_inotify_user_watch(&watch->wdata);
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;