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, 282 insertions, 0 deletions

diff --git a/kernel/fs/ufs/util.c b/kernel/fs/ufs/util.c
new file mode 100644
index 000000000..b6c2f94e0
--- /dev/null
+++ b/kernel/fs/ufs/util.c
@@ -0,0 +1,282 @@
+/*
+ *  linux/fs/ufs/util.c
+ *
+ * Copyright (C) 1998
+ * Daniel Pirkl <daniel.pirkl@email.cz>
+ * Charles University, Faculty of Mathematics and Physics
+ */
+ 
+#include <linux/string.h>
+#include <linux/slab.h>
+#include <linux/buffer_head.h>
+
+#include "ufs_fs.h"
+#include "ufs.h"
+#include "swab.h"
+#include "util.h"
+
+struct ufs_buffer_head * _ubh_bread_ (struct ufs_sb_private_info * uspi,
+	struct super_block *sb, u64 fragment, u64 size)
+{
+	struct ufs_buffer_head * ubh;
+	unsigned i, j ;
+	u64  count = 0;
+	if (size & ~uspi->s_fmask)
+		return NULL;
+	count = size >> uspi->s_fshift;
+	if (count > UFS_MAXFRAG)
+		return NULL;
+	ubh = kmalloc (sizeof (struct ufs_buffer_head), GFP_NOFS);
+	if (!ubh)
+		return NULL;
+	ubh->fragment = fragment;
+	ubh->count = count;
+	for (i = 0; i < count; i++)
+		if (!(ubh->bh[i] = sb_bread(sb, fragment + i)))
+			goto failed;
+	for (; i < UFS_MAXFRAG; i++)
+		ubh->bh[i] = NULL;
+	return ubh;
+failed:
+	for (j = 0; j < i; j++)
+		brelse (ubh->bh[j]);
+	kfree(ubh);
+	return NULL;
+}
+
+struct ufs_buffer_head * ubh_bread_uspi (struct ufs_sb_private_info * uspi,
+	struct super_block *sb, u64 fragment, u64 size)
+{
+	unsigned i, j;
+	u64 count = 0;
+	if (size & ~uspi->s_fmask)
+		return NULL;
+	count = size >> uspi->s_fshift;
+	if (count <= 0 || count > UFS_MAXFRAG)
+		return NULL;
+	USPI_UBH(uspi)->fragment = fragment;
+	USPI_UBH(uspi)->count = count;
+	for (i = 0; i < count; i++)
+		if (!(USPI_UBH(uspi)->bh[i] = sb_bread(sb, fragment + i)))
+			goto failed;
+	for (; i < UFS_MAXFRAG; i++)
+		USPI_UBH(uspi)->bh[i] = NULL;
+	return USPI_UBH(uspi);
+failed:
+	for (j = 0; j < i; j++)
+		brelse (USPI_UBH(uspi)->bh[j]);
+	return NULL;
+}
+
+void ubh_brelse (struct ufs_buffer_head * ubh)
+{
+	unsigned i;
+	if (!ubh)
+		return;
+	for (i = 0; i < ubh->count; i++)
+		brelse (ubh->bh[i]);
+	kfree (ubh);
+}
+
+void ubh_brelse_uspi (struct ufs_sb_private_info * uspi)
+{
+	unsigned i;
+	if (!USPI_UBH(uspi))
+		return;
+	for ( i = 0; i < USPI_UBH(uspi)->count; i++ ) {
+		brelse (USPI_UBH(uspi)->bh[i]);
+		USPI_UBH(uspi)->bh[i] = NULL;
+	}
+}
+
+void ubh_mark_buffer_dirty (struct ufs_buffer_head * ubh)
+{
+	unsigned i;
+	if (!ubh)
+		return;
+	for ( i = 0; i < ubh->count; i++ )
+		mark_buffer_dirty (ubh->bh[i]);
+}
+
+void ubh_mark_buffer_uptodate (struct ufs_buffer_head * ubh, int flag)
+{
+	unsigned i;
+	if (!ubh)
+		return;
+	if (flag) {
+		for ( i = 0; i < ubh->count; i++ )
+			set_buffer_uptodate (ubh->bh[i]);
+	} else {
+		for ( i = 0; i < ubh->count; i++ )
+			clear_buffer_uptodate (ubh->bh[i]);
+	}
+}
+
+void ubh_sync_block(struct ufs_buffer_head *ubh)
+{
+	if (ubh) {
+		unsigned i;
+
+		for (i = 0; i < ubh->count; i++)
+			write_dirty_buffer(ubh->bh[i], WRITE);
+
+		for (i = 0; i < ubh->count; i++)
+			wait_on_buffer(ubh->bh[i]);
+	}
+}
+
+void ubh_bforget (struct ufs_buffer_head * ubh)
+{
+	unsigned i;
+	if (!ubh) 
+		return;
+	for ( i = 0; i < ubh->count; i++ ) if ( ubh->bh[i] ) 
+		bforget (ubh->bh[i]);
+}
+ 
+int ubh_buffer_dirty (struct ufs_buffer_head * ubh)
+{
+	unsigned i;
+	unsigned result = 0;
+	if (!ubh)
+		return 0;
+	for ( i = 0; i < ubh->count; i++ )
+		result |= buffer_dirty(ubh->bh[i]);
+	return result;
+}
+
+void _ubh_ubhcpymem_(struct ufs_sb_private_info * uspi, 
+	unsigned char * mem, struct ufs_buffer_head * ubh, unsigned size)
+{
+	unsigned len, bhno;
+	if (size > (ubh->count << uspi->s_fshift))
+		size = ubh->count << uspi->s_fshift;
+	bhno = 0;
+	while (size) {
+		len = min_t(unsigned int, size, uspi->s_fsize);
+		memcpy (mem, ubh->bh[bhno]->b_data, len);
+		mem += uspi->s_fsize;
+		size -= len;
+		bhno++;
+	}
+}
+
+void _ubh_memcpyubh_(struct ufs_sb_private_info * uspi, 
+	struct ufs_buffer_head * ubh, unsigned char * mem, unsigned size)
+{
+	unsigned len, bhno;
+	if (size > (ubh->count << uspi->s_fshift))
+		size = ubh->count << uspi->s_fshift;
+	bhno = 0;
+	while (size) {
+		len = min_t(unsigned int, size, uspi->s_fsize);
+		memcpy (ubh->bh[bhno]->b_data, mem, len);
+		mem += uspi->s_fsize;
+		size -= len;
+		bhno++;
+	}
+}
+
+dev_t
+ufs_get_inode_dev(struct super_block *sb, struct ufs_inode_info *ufsi)
+{
+	__u32 fs32;
+	dev_t dev;
+
+	if ((UFS_SB(sb)->s_flags & UFS_ST_MASK) == UFS_ST_SUNx86)
+		fs32 = fs32_to_cpu(sb, ufsi->i_u1.i_data[1]);
+	else
+		fs32 = fs32_to_cpu(sb, ufsi->i_u1.i_data[0]);
+	switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
+	case UFS_ST_SUNx86:
+	case UFS_ST_SUN:
+		if ((fs32 & 0xffff0000) == 0 ||
+		    (fs32 & 0xffff0000) == 0xffff0000)
+			dev = old_decode_dev(fs32 & 0x7fff);
+		else
+			dev = MKDEV(sysv_major(fs32), sysv_minor(fs32));
+		break;
+
+	default:
+		dev = old_decode_dev(fs32);
+		break;
+	}
+	return dev;
+}
+
+void
+ufs_set_inode_dev(struct super_block *sb, struct ufs_inode_info *ufsi, dev_t dev)
+{
+	__u32 fs32;
+
+	switch (UFS_SB(sb)->s_flags & UFS_ST_MASK) {
+	case UFS_ST_SUNx86:
+	case UFS_ST_SUN:
+		fs32 = sysv_encode_dev(dev);
+		if ((fs32 & 0xffff8000) == 0) {
+			fs32 = old_encode_dev(dev);
+		}
+		break;
+
+	default:
+		fs32 = old_encode_dev(dev);
+		break;
+	}
+	if ((UFS_SB(sb)->s_flags & UFS_ST_MASK) == UFS_ST_SUNx86)
+		ufsi->i_u1.i_data[1] = cpu_to_fs32(sb, fs32);
+	else
+		ufsi->i_u1.i_data[0] = cpu_to_fs32(sb, fs32);
+}
+
+/**
+ * ufs_get_locked_page() - locate, pin and lock a pagecache page, if not exist
+ * read it from disk.
+ * @mapping: the address_space to search
+ * @index: the page index
+ *
+ * Locates the desired pagecache page, if not exist we'll read it,
+ * locks it, increments its reference
+ * count and returns its address.
+ *
+ */
+
+struct page *ufs_get_locked_page(struct address_space *mapping,
+				 pgoff_t index)
+{
+	struct page *page;
+
+	page = find_lock_page(mapping, index);
+	if (!page) {
+		page = read_mapping_page(mapping, index, NULL);
+
+		if (IS_ERR(page)) {
+			printk(KERN_ERR "ufs_change_blocknr: "
+			       "read_mapping_page error: ino %lu, index: %lu\n",
+			       mapping->host->i_ino, index);
+			goto out;
+		}
+
+		lock_page(page);
+
+		if (unlikely(page->mapping == NULL)) {
+			/* Truncate got there first */
+			unlock_page(page);
+			page_cache_release(page);
+			page = NULL;
+			goto out;
+		}
+
+		if (!PageUptodate(page) || PageError(page)) {
+			unlock_page(page);
+			page_cache_release(page);
+
+			printk(KERN_ERR "ufs_change_blocknr: "
+			       "can not read page: ino %lu, index: %lu\n",
+			       mapping->host->i_ino, index);
+
+			page = ERR_PTR(-EIO);
+		}
+	}
+out:
+	return page;
+}