On Thu 20-04-17 14:33:04, Amir Goldstein wrote:
>
> Sorry I messed up the previous patch. please try this one:
>
> diff --git a/fs/notify/fanotify/fanotify_user.c
> b/fs/notify/fanotify/fanotify_user.c
> index 2b37f27..7864354 100644
> --- a/fs/notify/fanotify/fanotify_user.c
> +++ b/fs/notify/fanotify/fanotify_user.c
> @@ -295,6 +295,16 @@ static ssize_t fanotify_read(struct file *file,
> char __user *buf,
> }
>
> ret = copy_event_to_user(group, kevent, buf);
> + if (unlikely(ret == -EOPENSTALE)) {
> + /*
> + * We cannot report events with stale fd so drop it.
> + * Setting ret to 0 will continue the event loop and
> + * do the right thing if there are no more events to
> + * read (i.e. return bytes read, -EAGAIN or wait).
> + */
> + ret = 0;
> + }
> +
> /*
> * Permission events get queued to wait for response. Other
> * events can be destroyed now.
> @@ -305,7 +315,7 @@ static ssize_t fanotify_read(struct file *file,
> char __user *buf,
> break;
> } else {
> #ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
> - if (ret < 0) {
> + if (ret <= 0) {
> FANOTIFY_PE(kevent)->response = FAN_DENY;
> wake_up(&group->fanotify_data.access_waitq);
> break;
I don't think you want to break out of the reading loop when ret == 0 and
the code might be more readable as:
if (!(kevent->mask & FAN_ALL_PERM_EVENTS)) {
fsnotify_destroy_event(group, kevent);
} else {
#ifdef CONFIG_FANOTIFY_ACCESS_PERMISSIONS
if (ret <= 0) {
FANOTIFY_PE(kevent)->response = FAN_DENY;
wake_up(&group->fanotify_data.access_waitq);
} else {
spin_lock(&group->notification_lock);
list_add_tail(&kevent->list,
&group->fanotify_data.access_list);
spin_unlock(&group->notification_lock);
}
#endif
}
if (ret < 0)
break;
Hmm?
Honza
--
Jan Kara <jack@xxxxxxxx>
SUSE Labs, CR
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