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-rw-r--r--fs/file.c29
1 files changed, 29 insertions, 0 deletions
diff --git a/fs/file.c b/fs/file.c
index 50304c7525ea..3209ee271c41 100644
--- a/fs/file.c
+++ b/fs/file.c
@@ -640,6 +640,35 @@ out_unlock:
}
EXPORT_SYMBOL(__close_fd); /* for ksys_close() */
+/*
+ * variant of __close_fd that gets a ref on the file for later fput
+ */
+int __close_fd_get_file(unsigned int fd, struct file **res)
+{
+ struct files_struct *files = current->files;
+ struct file *file;
+ struct fdtable *fdt;
+
+ spin_lock(&files->file_lock);
+ fdt = files_fdtable(files);
+ if (fd >= fdt->max_fds)
+ goto out_unlock;
+ file = fdt->fd[fd];
+ if (!file)
+ goto out_unlock;
+ rcu_assign_pointer(fdt->fd[fd], NULL);
+ __put_unused_fd(files, fd);
+ spin_unlock(&files->file_lock);
+ get_file(file);
+ *res = file;
+ return filp_close(file, files);
+
+out_unlock:
+ spin_unlock(&files->file_lock);
+ *res = NULL;
+ return -ENOENT;
+}
+
void do_close_on_exec(struct files_struct *files)
{
unsigned i;