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-rw-r--r--fs/eventpoll.c42
1 files changed, 42 insertions, 0 deletions
diff --git a/fs/eventpoll.c b/fs/eventpoll.c
index 322904c3ebdf..e7e9901c3790 100644
--- a/fs/eventpoll.c
+++ b/fs/eventpoll.c
@@ -1077,6 +1077,48 @@ static struct epitem *ep_find(struct eventpoll *ep, struct file *file, int fd)
return epir;
}
+static struct epitem *ep_find_tfd(struct eventpoll *ep, int tfd, unsigned long toff)
+{
+ struct rb_node *rbp;
+ struct epitem *epi;
+
+ for (rbp = rb_first(&ep->rbr); rbp; rbp = rb_next(rbp)) {
+ epi = rb_entry(rbp, struct epitem, rbn);
+ if (epi->ffd.fd == tfd) {
+ if (toff == 0)
+ return epi;
+ else
+ toff--;
+ }
+ cond_resched();
+ }
+
+ return NULL;
+}
+
+struct file *get_epoll_tfile_raw_ptr(struct file *file, int tfd,
+ unsigned long toff)
+{
+ struct file *file_raw;
+ struct eventpoll *ep;
+ struct epitem *epi;
+
+ if (!is_file_epoll(file))
+ return ERR_PTR(-EINVAL);
+
+ ep = file->private_data;
+
+ mutex_lock(&ep->mtx);
+ epi = ep_find_tfd(ep, tfd, toff);
+ if (epi)
+ file_raw = epi->ffd.file;
+ else
+ file_raw = ERR_PTR(-ENOENT);
+ mutex_unlock(&ep->mtx);
+
+ return file_raw;
+}
+
/*
* This is the callback that is passed to the wait queue wakeup
* mechanism. It is called by the stored file descriptors when they