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Subject[PATCH 08/13] fsnotify: include pathnames with entries when possible
Date
When inotify wants to send events to a directory about a child it includes
the name of the original file. This patch collects that filename and makes
it available for notification.

Signed-off-by: Eric Paris <eparis@redhat.com>
---
fs/notify/fsnotify.c | 4 ++--
fs/notify/fsnotify.h | 4 ++++
fs/notify/notification.c | 19 ++++++++++++++++++-
include/linux/fsnotify.h | 30 +++++++++++++++---------------
include/linux/fsnotify_backend.h | 9 ++++++---
5 files changed, 45 insertions(+), 21 deletions(-)
diff --git a/fs/notify/fsnotify.c b/fs/notify/fsnotify.c
index 4cc2d46..6816b81 100644
--- a/fs/notify/fsnotify.c
+++ b/fs/notify/fsnotify.c
@@ -37,7 +37,7 @@ EXPORT_SYMBOL_GPL(__fsnotify_inode_delete);
* out to all of the registered fsnotify_group. Those groups can then use the
* notification event in whatever means they feel necessary.
*/
-void fsnotify(struct inode *to_tell, __u32 mask, void *data, int data_is)
+void fsnotify(struct inode *to_tell, __u32 mask, void *data, int data_is, const char *file_name)
{
struct fsnotify_group *group;
struct fsnotify_event *event = NULL;
@@ -62,7 +62,7 @@ void fsnotify(struct inode *to_tell, __u32 mask, void *data, int data_is)
if (!group->ops->should_send_event(group, to_tell, mask))
continue;
if (!event) {
- event = fsnotify_create_event(to_tell, mask, data, data_is);
+ event = fsnotify_create_event(to_tell, mask, data, data_is, file_name);
/* shit, we OOM'd and now we can't tell, maybe
* someday someone else will want to do something
* here */
diff --git a/fs/notify/fsnotify.h b/fs/notify/fsnotify.h
index 4ae0741..06585db 100644
--- a/fs/notify/fsnotify.h
+++ b/fs/notify/fsnotify.h
@@ -19,4 +19,8 @@ extern void fsnotify_flush_notif(struct fsnotify_group *group);

extern void fsnotify_clear_marks_by_group(struct fsnotify_group *group);
extern void fsnotify_clear_marks_by_inode(struct inode *inode);
+
+extern struct fsnotify_event_holder *fsnotify_alloc_event_holder(void);
+extern void fsnotify_destroy_event_holder(struct fsnotify_event_holder *holder);
+
#endif /* _LINUX_FSNOTIFY_PRIVATE_H */
diff --git a/fs/notify/notification.c b/fs/notify/notification.c
index be98511..1e7b4ca 100644
--- a/fs/notify/notification.c
+++ b/fs/notify/notification.c
@@ -62,6 +62,8 @@ void fsnotify_put_event(struct fsnotify_event *event)
if (atomic_dec_and_test(&event->refcnt)) {
if (event->data_type == FSNOTIFY_EVENT_PATH)
path_put(&event->path);
+
+ kfree(event->file_name);
kmem_cache_free(event_kmem_cache, event);
}
}
@@ -239,6 +241,9 @@ static void initialize_event(struct fsnotify_event *event)
event->data_type = FSNOTIFY_EVENT_NONE;

event->to_tell = NULL;
+
+ event->file_name = NULL;
+ event->name_len = 0;
}

/*
@@ -249,7 +254,7 @@ static void initialize_event(struct fsnotify_event *event)
* @data pointer to the object which was actually affected
* @data_type flag indication if the data is a file, path, inode, nothing...
*/
-struct fsnotify_event *fsnotify_create_event(struct inode *to_tell, __u32 mask, void *data, int data_type)
+struct fsnotify_event *fsnotify_create_event(struct inode *to_tell, __u32 mask, void *data, int data_type, const char *name)
{
struct fsnotify_event *event;

@@ -258,6 +263,15 @@ struct fsnotify_event *fsnotify_create_event(struct inode *to_tell, __u32 mask,
return NULL;

initialize_event(event);
+
+ if (name) {
+ event->file_name = kstrdup(name, GFP_KERNEL);
+ if (!event->file_name) {
+ kmem_cache_free(event_kmem_cache, event);
+ return NULL;
+ }
+ event->name_len = strlen(event->file_name);
+ }
event->to_tell = to_tell;

switch (data_type) {
@@ -283,6 +297,9 @@ struct fsnotify_event *fsnotify_create_event(struct inode *to_tell, __u32 mask,
event->data_type = FSNOTIFY_EVENT_INODE;
break;
default:
+ event->path.dentry = NULL;
+ event->path.mnt = NULL;
+ event->inode = NULL;
BUG();
};

diff --git a/include/linux/fsnotify.h b/include/linux/fsnotify.h
index 8b9539c..48762b1 100644
--- a/include/linux/fsnotify.h
+++ b/include/linux/fsnotify.h
@@ -54,7 +54,7 @@ static inline void fsnotify_parent(struct dentry *dentry, __u32 mask)
spin_unlock(&dentry->d_lock);

if (send) {
- fsnotify(p_inode, mask, dentry->d_inode, FSNOTIFY_EVENT_INODE);
+ fsnotify(p_inode, mask, dentry->d_inode, FSNOTIFY_EVENT_INODE, dentry->d_name.name);
dput(parent);
}
}
@@ -92,7 +92,7 @@ static inline void fsnotify_inoderemove(struct inode *inode)
inotify_inode_queue_event(inode, IN_DELETE_SELF, 0, NULL, NULL);
inotify_inode_is_dead(inode);

- fsnotify(inode, FS_DELETE_SELF, inode, FSNOTIFY_EVENT_INODE);
+ fsnotify(inode, FS_DELETE_SELF, inode, FSNOTIFY_EVENT_INODE, NULL);
__fsnotify_inode_delete(inode);
}

@@ -126,15 +126,15 @@ static inline void fsnotify_move(struct inode *old_dir, struct inode *new_dir,
inotify_inode_queue_event(new_dir, IN_MOVED_TO|isdir, cookie, new_name,
source);

- fsnotify(old_dir, old_dir_mask, old_dir, FSNOTIFY_EVENT_INODE);
- fsnotify(new_dir, new_dir_mask, new_dir, FSNOTIFY_EVENT_INODE);
+ fsnotify(old_dir, old_dir_mask, old_dir, FSNOTIFY_EVENT_INODE, old_name);
+ fsnotify(new_dir, new_dir_mask, new_dir, FSNOTIFY_EVENT_INODE, new_name);

if (target)
fsnotify_inoderemove(target);

if (source) {
inotify_inode_queue_event(source, IN_MOVE_SELF, 0, NULL, NULL);
- fsnotify(source, FS_MOVE_SELF, moved->d_inode, FSNOTIFY_EVENT_INODE);
+ fsnotify(source, FS_MOVE_SELF, moved->d_inode, FSNOTIFY_EVENT_INODE, NULL);
}
audit_inode_child(new_name, moved, new_dir);
}
@@ -158,7 +158,7 @@ static inline void fsnotify_link_count(struct inode *inode)
{
inotify_inode_queue_event(inode, IN_ATTRIB, 0, NULL, NULL);

- fsnotify(inode, FS_ATTRIB, inode, FSNOTIFY_EVENT_INODE);
+ fsnotify(inode, FS_ATTRIB, inode, FSNOTIFY_EVENT_INODE, NULL);
}

/*
@@ -170,7 +170,7 @@ static inline void fsnotify_create(struct inode *inode, struct dentry *dentry)
dentry->d_inode);
audit_inode_child(dentry->d_name.name, dentry, inode);

- fsnotify(inode, FS_CREATE, dentry->d_inode, FSNOTIFY_EVENT_INODE);
+ fsnotify(inode, FS_CREATE, dentry->d_inode, FSNOTIFY_EVENT_INODE, dentry->d_name.name);
}

/*
@@ -185,7 +185,7 @@ static inline void fsnotify_link(struct inode *dir, struct inode *inode, struct
fsnotify_link_count(inode);
audit_inode_child(new_dentry->d_name.name, new_dentry, dir);

- fsnotify(dir, FS_CREATE, inode, FSNOTIFY_EVENT_INODE);
+ fsnotify(dir, FS_CREATE, inode, FSNOTIFY_EVENT_INODE, new_dentry->d_name.name);
}

/*
@@ -197,7 +197,7 @@ static inline void fsnotify_mkdir(struct inode *inode, struct dentry *dentry)
dentry->d_name.name, dentry->d_inode);
audit_inode_child(dentry->d_name.name, dentry, inode);

- fsnotify(inode, FS_CREATE | FS_IN_ISDIR, dentry->d_inode, FSNOTIFY_EVENT_INODE);
+ fsnotify(inode, FS_CREATE | FS_IN_ISDIR, dentry->d_inode, FSNOTIFY_EVENT_INODE, dentry->d_name.name);
}

/*
@@ -215,7 +215,7 @@ static inline void fsnotify_access(struct dentry *dentry)
inotify_inode_queue_event(inode, mask, 0, NULL, NULL);

fsnotify_parent(dentry, mask);
- fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE);
+ fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL);
}

/*
@@ -233,7 +233,7 @@ static inline void fsnotify_modify(struct dentry *dentry)
inotify_inode_queue_event(inode, mask, 0, NULL, NULL);

fsnotify_parent(dentry, mask);
- fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE);
+ fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL);
}

/*
@@ -251,7 +251,7 @@ static inline void fsnotify_open(struct dentry *dentry)
inotify_inode_queue_event(inode, mask, 0, NULL, NULL);

fsnotify_parent(dentry, mask);
- fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE);
+ fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL);
}

/*
@@ -272,7 +272,7 @@ static inline void fsnotify_close(struct file *file)
inotify_inode_queue_event(inode, mask, 0, NULL, NULL);

fsnotify_parent(dentry, mask);
- fsnotify(inode, mask, file, FSNOTIFY_EVENT_FILE);
+ fsnotify(inode, mask, file, FSNOTIFY_EVENT_FILE, NULL);
}

/*
@@ -290,7 +290,7 @@ static inline void fsnotify_xattr(struct dentry *dentry)
inotify_inode_queue_event(inode, mask, 0, NULL, NULL);

fsnotify_parent(dentry, mask);
- fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE);
+ fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL);
}

/*
@@ -328,7 +328,7 @@ static inline void fsnotify_change(struct dentry *dentry, unsigned int ia_valid)
dentry->d_name.name);

fsnotify_parent(dentry, mask);
- fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE);
+ fsnotify(inode, mask, inode, FSNOTIFY_EVENT_INODE, NULL);
}
}

diff --git a/include/linux/fsnotify_backend.h b/include/linux/fsnotify_backend.h
index e5b674e..a2c3b06 100644
--- a/include/linux/fsnotify_backend.h
+++ b/include/linux/fsnotify_backend.h
@@ -159,6 +159,9 @@ struct fsnotify_event {
int data_type; /* which of the above union we have */
atomic_t refcnt; /* how many groups still are using/need to send this event */
__u32 mask; /* the type of access */
+
+ char *file_name;
+ size_t name_len;
};

/*
@@ -189,7 +192,7 @@ struct fsnotify_mark_entry {
#ifdef CONFIG_FSNOTIFY

/* called from the vfs to signal fs events */
-extern void fsnotify(struct inode *to_tell, __u32 mask, void *data, int data_is);
+extern void fsnotify(struct inode *to_tell, __u32 mask, void *data, int data_is, const char *name);
extern void __fsnotify_inode_delete(struct inode *inode);

static inline int fsnotify_inode_watches_children(struct inode *inode)
@@ -248,11 +251,11 @@ extern void fsnotify_get_mark(struct fsnotify_mark_entry *entry);
extern void fsnotify_put_mark(struct fsnotify_mark_entry *entry);

/* put here because inotify does some weird stuff when destroying watches */
-extern struct fsnotify_event *fsnotify_create_event(struct inode *to_tell, __u32 mask, void *data, int data_is);
+extern struct fsnotify_event *fsnotify_create_event(struct inode *to_tell, __u32 mask, void *data, int data_is, const char *name);

#else

-static inline void fsnotify(struct inode *to_tell, __u32 mask, void *data, int data_is);
+static inline void fsnotify(struct inode *to_tell, __u32 mask, void *data, int data_is, const char *name);
{}

static inline void __fsnotify_inode_delete(struct inode *inode)


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