Add the rt linux 4.1.3-rt3 as base

[kvmfornfv.git] / kernel / fs / ramfs / file-mmu.c

diff --git a/kernel/fs/ramfs/file-mmu.c b/kernel/fs/ramfs/file-mmu.c
new file mode 100644 (file)
index 0000000..183a212
--- /dev/null
+++ b/kernel/fs/ramfs/file-mmu.c
@@ -0,0 +1,46 @@
+/* file-mmu.c: ramfs MMU-based file operations
+ *
+ * Resizable simple ram filesystem for Linux.
+ *
+ * Copyright (C) 2000 Linus Torvalds.
+ *               2000 Transmeta Corp.
+ *
+ * Usage limits added by David Gibson, Linuxcare Australia.
+ * This file is released under the GPL.
+ */
+
+/*
+ * NOTE! This filesystem is probably most useful
+ * not as a real filesystem, but as an example of
+ * how virtual filesystems can be written.
+ *
+ * It doesn't get much simpler than this. Consider
+ * that this file implements the full semantics of
+ * a POSIX-compliant read-write filesystem.
+ *
+ * Note in particular how the filesystem does not
+ * need to implement any data structures of its own
+ * to keep track of the virtual data: using the VFS
+ * caches is sufficient.
+ */
+
+#include <linux/fs.h>
+#include <linux/mm.h>
+#include <linux/ramfs.h>
+
+#include "internal.h"
+
+const struct file_operations ramfs_file_operations = {
+       .read_iter      = generic_file_read_iter,
+       .write_iter     = generic_file_write_iter,
+       .mmap           = generic_file_mmap,
+       .fsync          = noop_fsync,
+       .splice_read    = generic_file_splice_read,
+       .splice_write   = iter_file_splice_write,
+       .llseek         = generic_file_llseek,
+};
+
+const struct inode_operations ramfs_file_inode_operations = {
+       .setattr        = simple_setattr,
+       .getattr        = simple_getattr,
+};