diff options
| author | Amir Goldstein <amir73il@gmail.com> | 2020-07-16 11:42:22 +0300 |
|---|---|---|
| committer | Jan Kara <jack@suse.cz> | 2020-07-27 21:24:52 +0200 |
| commit | 497b0c5a7c0688c1b100a9c2e267337f677c198e (patch) | |
| tree | 2ed4f29d98b1a8b99ebea359b7980645a96fa6d1 /fs/notify/fanotify/fanotify.c | |
| parent | c8f3446c66d810e21af61cf889e7b0e3bc921b9d (diff) | |
fsnotify: send event to parent and child with single callback
Instead of calling fsnotify() twice, once with parent inode and once
with child inode, if event should be sent to parent inode, send it
with both parent and child inodes marks in object type iterator and call
the backend handle_event() callback only once.
The parent inode is assigned to the standard "inode" iterator type and
the child inode is assigned to the special "child" iterator type.
In that case, the bit FS_EVENT_ON_CHILD will be set in the event mask,
the dir argument to handle_event will be the parent inode, the file_name
argument to handle_event is non NULL and refers to the name of the child
and the child inode can be accessed with fsnotify_data_inode().
This will allow fanotify to make decisions based on child or parent's
ignored mask. For example, when a parent is interested in a specific
event on its children, but a specific child wishes to ignore this event,
the event will not be reported. This is not what happens with current
code, but according to man page, it is the expected behavior.
Link: https://lore.kernel.org/r/20200716084230.30611-15-amir73il@gmail.com
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Diffstat (limited to 'fs/notify/fanotify/fanotify.c')
| -rw-r--r-- | fs/notify/fanotify/fanotify.c | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/fs/notify/fanotify/fanotify.c b/fs/notify/fanotify/fanotify.c index c107974d6830..3baf93e998c1 100644 --- a/fs/notify/fanotify/fanotify.c +++ b/fs/notify/fanotify/fanotify.c @@ -261,12 +261,12 @@ static u32 fanotify_group_event_mask(struct fsnotify_group *group, continue; /* - * If the event is for a child and this mark doesn't care about - * events on a child, don't send it! + * If the event is for a child and this mark is on a parent not + * watching children, don't send it! */ if (event_mask & FS_EVENT_ON_CHILD && - (type != FSNOTIFY_OBJ_TYPE_INODE || - !(mark->mask & FS_EVENT_ON_CHILD))) + type == FSNOTIFY_OBJ_TYPE_INODE && + !(mark->mask & FS_EVENT_ON_CHILD)) continue; marks_mask |= mark->mask; |