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, 293 insertions, 0 deletions

diff --git a/kernel/fs/freevxfs/vxfs_super.c b/kernel/fs/freevxfs/vxfs_super.c
new file mode 100644
index 000000000..7ca8c75d5
--- /dev/null
+++ b/kernel/fs/freevxfs/vxfs_super.c
@@ -0,0 +1,293 @@
+/*
+ * Copyright (c) 2000-2001 Christoph Hellwig.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification.
+ * 2. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * Alternatively, this software may be distributed under the terms of the
+ * GNU General Public License ("GPL").
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * Veritas filesystem driver - superblock related routines.
+ */
+#include <linux/init.h>
+#include <linux/module.h>
+
+#include <linux/blkdev.h>
+#include <linux/fs.h>
+#include <linux/buffer_head.h>
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/stat.h>
+#include <linux/vfs.h>
+#include <linux/mount.h>
+
+#include "vxfs.h"
+#include "vxfs_extern.h"
+#include "vxfs_dir.h"
+#include "vxfs_inode.h"
+
+
+MODULE_AUTHOR("Christoph Hellwig");
+MODULE_DESCRIPTION("Veritas Filesystem (VxFS) driver");
+MODULE_LICENSE("Dual BSD/GPL");
+
+
+
+static void		vxfs_put_super(struct super_block *);
+static int		vxfs_statfs(struct dentry *, struct kstatfs *);
+static int		vxfs_remount(struct super_block *, int *, char *);
+
+static const struct super_operations vxfs_super_ops = {
+	.evict_inode =		vxfs_evict_inode,
+	.put_super =		vxfs_put_super,
+	.statfs =		vxfs_statfs,
+	.remount_fs =		vxfs_remount,
+};
+
+/**
+ * vxfs_put_super - free superblock resources
+ * @sbp:	VFS superblock.
+ *
+ * Description:
+ *   vxfs_put_super frees all resources allocated for @sbp
+ *   after the last instance of the filesystem is unmounted.
+ */
+
+static void
+vxfs_put_super(struct super_block *sbp)
+{
+	struct vxfs_sb_info	*infp = VXFS_SBI(sbp);
+
+	vxfs_put_fake_inode(infp->vsi_fship);
+	vxfs_put_fake_inode(infp->vsi_ilist);
+	vxfs_put_fake_inode(infp->vsi_stilist);
+
+	brelse(infp->vsi_bp);
+	kfree(infp);
+}
+
+/**
+ * vxfs_statfs - get filesystem information
+ * @dentry:	VFS dentry to locate superblock
+ * @bufp:	output buffer
+ *
+ * Description:
+ *   vxfs_statfs fills the statfs buffer @bufp with information
+ *   about the filesystem described by @dentry.
+ *
+ * Returns:
+ *   Zero.
+ *
+ * Locking:
+ *   No locks held.
+ *
+ * Notes:
+ *   This is everything but complete...
+ */
+static int
+vxfs_statfs(struct dentry *dentry, struct kstatfs *bufp)
+{
+	struct vxfs_sb_info		*infp = VXFS_SBI(dentry->d_sb);
+
+	bufp->f_type = VXFS_SUPER_MAGIC;
+	bufp->f_bsize = dentry->d_sb->s_blocksize;
+	bufp->f_blocks = infp->vsi_raw->vs_dsize;
+	bufp->f_bfree = infp->vsi_raw->vs_free;
+	bufp->f_bavail = 0;
+	bufp->f_files = 0;
+	bufp->f_ffree = infp->vsi_raw->vs_ifree;
+	bufp->f_namelen = VXFS_NAMELEN;
+
+	return 0;
+}
+
+static int vxfs_remount(struct super_block *sb, int *flags, char *data)
+{
+	sync_filesystem(sb);
+	*flags |= MS_RDONLY;
+	return 0;
+}
+
+/**
+ * vxfs_read_super - read superblock into memory and initialize filesystem
+ * @sbp:		VFS superblock (to fill)
+ * @dp:			fs private mount data
+ * @silent:		do not complain loudly when sth is wrong
+ *
+ * Description:
+ *   We are called on the first mount of a filesystem to read the
+ *   superblock into memory and do some basic setup.
+ *
+ * Returns:
+ *   The superblock on success, else %NULL.
+ *
+ * Locking:
+ *   We are under @sbp->s_lock.
+ */
+static int vxfs_fill_super(struct super_block *sbp, void *dp, int silent)
+{
+	struct vxfs_sb_info	*infp;
+	struct vxfs_sb		*rsbp;
+	struct buffer_head	*bp = NULL;
+	u_long			bsize;
+	struct inode *root;
+	int ret = -EINVAL;
+
+	sbp->s_flags |= MS_RDONLY;
+
+	infp = kzalloc(sizeof(*infp), GFP_KERNEL);
+	if (!infp) {
+		printk(KERN_WARNING "vxfs: unable to allocate incore superblock\n");
+		return -ENOMEM;
+	}
+
+	bsize = sb_min_blocksize(sbp, BLOCK_SIZE);
+	if (!bsize) {
+		printk(KERN_WARNING "vxfs: unable to set blocksize\n");
+		goto out;
+	}
+
+	bp = sb_bread(sbp, 1);
+	if (!bp || !buffer_mapped(bp)) {
+		if (!silent) {
+			printk(KERN_WARNING
+				"vxfs: unable to read disk superblock\n");
+		}
+		goto out;
+	}
+
+	rsbp = (struct vxfs_sb *)bp->b_data;
+	if (rsbp->vs_magic != VXFS_SUPER_MAGIC) {
+		if (!silent)
+			printk(KERN_NOTICE "vxfs: WRONG superblock magic\n");
+		goto out;
+	}
+
+	if ((rsbp->vs_version < 2 || rsbp->vs_version > 4) && !silent) {
+		printk(KERN_NOTICE "vxfs: unsupported VxFS version (%d)\n",
+		       rsbp->vs_version);
+		goto out;
+	}
+
+#ifdef DIAGNOSTIC
+	printk(KERN_DEBUG "vxfs: supported VxFS version (%d)\n", rsbp->vs_version);
+	printk(KERN_DEBUG "vxfs: blocksize: %d\n", rsbp->vs_bsize);
+#endif
+
+	sbp->s_magic = rsbp->vs_magic;
+	sbp->s_fs_info = infp;
+
+	infp->vsi_raw = rsbp;
+	infp->vsi_bp = bp;
+	infp->vsi_oltext = rsbp->vs_oltext[0];
+	infp->vsi_oltsize = rsbp->vs_oltsize;
+
+	if (!sb_set_blocksize(sbp, rsbp->vs_bsize)) {
+		printk(KERN_WARNING "vxfs: unable to set final block size\n");
+		goto out;
+	}
+
+	if (vxfs_read_olt(sbp, bsize)) {
+		printk(KERN_WARNING "vxfs: unable to read olt\n");
+		goto out;
+	}
+
+	if (vxfs_read_fshead(sbp)) {
+		printk(KERN_WARNING "vxfs: unable to read fshead\n");
+		goto out;
+	}
+
+	sbp->s_op = &vxfs_super_ops;
+	root = vxfs_iget(sbp, VXFS_ROOT_INO);
+	if (IS_ERR(root)) {
+		ret = PTR_ERR(root);
+		goto out;
+	}
+	sbp->s_root = d_make_root(root);
+	if (!sbp->s_root) {
+		printk(KERN_WARNING "vxfs: unable to get root dentry.\n");
+		goto out_free_ilist;
+	}
+
+	return 0;
+	
+out_free_ilist:
+	vxfs_put_fake_inode(infp->vsi_fship);
+	vxfs_put_fake_inode(infp->vsi_ilist);
+	vxfs_put_fake_inode(infp->vsi_stilist);
+out:
+	brelse(bp);
+	kfree(infp);
+	return ret;
+}
+
+/*
+ * The usual module blurb.
+ */
+static struct dentry *vxfs_mount(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data)
+{
+	return mount_bdev(fs_type, flags, dev_name, data, vxfs_fill_super);
+}
+
+static struct file_system_type vxfs_fs_type = {
+	.owner		= THIS_MODULE,
+	.name		= "vxfs",
+	.mount		= vxfs_mount,
+	.kill_sb	= kill_block_super,
+	.fs_flags	= FS_REQUIRES_DEV,
+};
+MODULE_ALIAS_FS("vxfs"); /* makes mount -t vxfs autoload the module */
+MODULE_ALIAS("vxfs");
+
+static int __init
+vxfs_init(void)
+{
+	int rv;
+
+	vxfs_inode_cachep = kmem_cache_create("vxfs_inode",
+			sizeof(struct vxfs_inode_info), 0,
+			SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, NULL);
+	if (!vxfs_inode_cachep)
+		return -ENOMEM;
+	rv = register_filesystem(&vxfs_fs_type);
+	if (rv < 0)
+		kmem_cache_destroy(vxfs_inode_cachep);
+	return rv;
+}
+
+static void __exit
+vxfs_cleanup(void)
+{
+	unregister_filesystem(&vxfs_fs_type);
+	/*
+	 * Make sure all delayed rcu free inodes are flushed before we
+	 * destroy cache.
+	 */
+	rcu_barrier();
+	kmem_cache_destroy(vxfs_inode_cachep);
+}
+
+module_init(vxfs_init);
+module_exit(vxfs_cleanup);