Add the rt linux 4.1.3-rt3 as base

Import the rt linux 4.1.3-rt3 as OPNFV kvm base.

It's from git://git.kernel.org/pub/scm/linux/kernel/git/rt/linux-rt-devel.git linux-4.1.y-rt and
the base is:

commit 0917f823c59692d751951bf5ea699a2d1e2f26a2
Author: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Date:   Sat Jul 25 12:13:34 2015 +0200

    Prepare v4.1.3-rt3

    Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>

We lose all the git history this way and it's not good. We
should apply another opnfv project repo in future.

Change-Id: I87543d81c9df70d99c5001fbdf646b202c19f423
Signed-off-by: Yunhong Jiang <yunhong.jiang@intel.com>

1 files changed, 54 insertions, 0 deletions

diff --git a/kernel/fs/efs/symlink.c b/kernel/fs/efs/symlink.c
new file mode 100644
index 000000000..75117d0da
--- /dev/null
+++ b/kernel/fs/efs/symlink.c
@@ -0,0 +1,54 @@
+/*
+ * symlink.c
+ *
+ * Copyright (c) 1999 Al Smith
+ *
+ * Portions derived from work (c) 1995,1996 Christian Vogelgsang.
+ */
+
+#include <linux/string.h>
+#include <linux/pagemap.h>
+#include <linux/buffer_head.h>
+#include "efs.h"
+
+static int efs_symlink_readpage(struct file *file, struct page *page)
+{
+	char *link = kmap(page);
+	struct buffer_head * bh;
+	struct inode * inode = page->mapping->host;
+	efs_block_t size = inode->i_size;
+	int err;
+  
+	err = -ENAMETOOLONG;
+	if (size > 2 * EFS_BLOCKSIZE)
+		goto fail;
+  
+	/* read first 512 bytes of link target */
+	err = -EIO;
+	bh = sb_bread(inode->i_sb, efs_bmap(inode, 0));
+	if (!bh)
+		goto fail;
+	memcpy(link, bh->b_data, (size > EFS_BLOCKSIZE) ? EFS_BLOCKSIZE : size);
+	brelse(bh);
+	if (size > EFS_BLOCKSIZE) {
+		bh = sb_bread(inode->i_sb, efs_bmap(inode, 1));
+		if (!bh)
+			goto fail;
+		memcpy(link + EFS_BLOCKSIZE, bh->b_data, size - EFS_BLOCKSIZE);
+		brelse(bh);
+	}
+	link[size] = '\0';
+	SetPageUptodate(page);
+	kunmap(page);
+	unlock_page(page);
+	return 0;
+fail:
+	SetPageError(page);
+	kunmap(page);
+	unlock_page(page);
+	return err;
+}
+
+const struct address_space_operations efs_symlink_aops = {
+	.readpage	= efs_symlink_readpage
+};