fsnotify usually calls inotify_handle_event() once for watching parent
to report event with child's name and once for watching child to report
event without child's name.
Do the same thing with a single callback instead of two callbacks when
marks iterator contains both inode and child entries.
Signed-off-by: Amir Goldstein <amir73il@xxxxxxxxx>
---
fs/notify/inotify/inotify_fsnotify.c | 44 ++++++++++++++++++++++------
1 file changed, 35 insertions(+), 9 deletions(-)
diff --git a/fs/notify/inotify/inotify_fsnotify.c b/fs/notify/inotify/inotify_fsnotify.c
index dfd455798a1b..a65cf8c9f600 100644
--- a/fs/notify/inotify/inotify_fsnotify.c
+++ b/fs/notify/inotify/inotify_fsnotify.c
@@ -55,13 +55,11 @@ static int inotify_merge(struct list_head *list,
return event_compare(last_event, event);
}
-int inotify_handle_event(struct fsnotify_group *group, u32 mask,
- const void *data, int data_type, struct inode *dir,
- const struct qstr *file_name, u32 cookie,
- struct fsnotify_iter_info *iter_info)
+static int inotify_one_event(struct fsnotify_group *group, u32 mask,
+ struct fsnotify_mark *inode_mark,
+ const struct path *path,
+ const struct qstr *file_name, u32 cookie)
{
- const struct path *path = fsnotify_data_path(data, data_type);
- struct fsnotify_mark *inode_mark = fsnotify_iter_inode_mark(iter_info);
struct inotify_inode_mark *i_mark;
struct inotify_event_info *event;
struct fsnotify_event *fsn_event;
@@ -69,9 +67,6 @@ int inotify_handle_event(struct fsnotify_group *group, u32 mask,
int len = 0;
int alloc_len = sizeof(struct inotify_event_info);
- if (WARN_ON(fsnotify_iter_vfsmount_mark(iter_info)))
- return 0;
-
if ((inode_mark->mask & FS_EXCL_UNLINK) &&
path && d_unlinked(path->dentry))
return 0;
@@ -135,6 +130,37 @@ int inotify_handle_event(struct fsnotify_group *group, u32 mask,
return 0;
}
+int inotify_handle_event(struct fsnotify_group *group, u32 mask,
+ const void *data, int data_type, struct inode *dir,
+ const struct qstr *file_name, u32 cookie,
+ struct fsnotify_iter_info *iter_info)
+{
+ const struct path *path = fsnotify_data_path(data, data_type);
+ struct fsnotify_mark *inode_mark = fsnotify_iter_inode_mark(iter_info);
+ struct fsnotify_mark *child_mark = fsnotify_iter_child_mark(iter_info);
+ int ret = 0;
+
+ if (WARN_ON(fsnotify_iter_vfsmount_mark(iter_info)))
+ return 0;
+
+ /*
+ * Some events cannot be sent on both parent and child marks
+ * (e.g. IN_CREATE). Those events are always sent on inode_mark.
+ * For events that are possible on both parent and child (e.g. IN_OPEN),
+ * event is sent on inode_mark with name if the parent is watching and
+ * is sent on child_mark without name if child is watching.
+ * If both parent and child are watching, report the event with child's
+ * name here and report another event without child's name below.
+ */
+ if (inode_mark)
+ ret = inotify_one_event(group, mask, inode_mark, path,
+ file_name, cookie);
+ if (ret || !child_mark)
+ return ret;
+
+ return inotify_one_event(group, mask, child_mark, path, NULL, 0);
+}
+
static void inotify_freeing_mark(struct fsnotify_mark *fsn_mark, struct fsnotify_group *group)
{
inotify_ignored_and_remove_idr(fsn_mark, group);
--
2.17.1
