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-rw-r--r--fs/file.c21
1 files changed, 21 insertions, 0 deletions
diff --git a/fs/file.c b/fs/file.c
index 6448523ca29e..23b888a4acbe 100644
--- a/fs/file.c
+++ b/fs/file.c
@@ -880,6 +880,27 @@ struct file *task_lookup_fd_rcu(struct task_struct *task, unsigned int fd)
return file;
}
+struct file *task_lookup_next_fd_rcu(struct task_struct *task, unsigned int *ret_fd)
+{
+ /* Must be called with rcu_read_lock held */
+ struct files_struct *files;
+ unsigned int fd = *ret_fd;
+ struct file *file = NULL;
+
+ task_lock(task);
+ files = task->files;
+ if (files) {
+ for (; fd < files_fdtable(files)->max_fds; fd++) {
+ file = files_lookup_fd_rcu(files, fd);
+ if (file)
+ break;
+ }
+ }
+ task_unlock(task);
+ *ret_fd = fd;
+ return file;
+}
+
/*
* Lightweight file lookup - no refcnt increment if fd table isn't shared.
*