From 57f0f512b273f60d52568b8c6b77e17f5636edc0 Mon Sep 17 00:00:00 2001
From: André Fabian Silva Delgado <emulatorman@parabola.nu>
Date: Wed, 5 Aug 2015 17:04:01 -0300
Subject: Initial import

---
 fs/freevxfs/vxfs_immed.c | 115 +++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 115 insertions(+)
 create mode 100644 fs/freevxfs/vxfs_immed.c

(limited to 'fs/freevxfs/vxfs_immed.c')

diff --git a/fs/freevxfs/vxfs_immed.c b/fs/freevxfs/vxfs_immed.c
new file mode 100644
index 000000000..8b9229e2c
--- /dev/null
+++ b/fs/freevxfs/vxfs_immed.c
@@ -0,0 +1,115 @@
+/*
+ * 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 - support for 'immed' inodes.
+ */
+#include <linux/fs.h>
+#include <linux/pagemap.h>
+#include <linux/namei.h>
+
+#include "vxfs.h"
+#include "vxfs_extern.h"
+#include "vxfs_inode.h"
+
+
+static void *	vxfs_immed_follow_link(struct dentry *, struct nameidata *);
+
+static int	vxfs_immed_readpage(struct file *, struct page *);
+
+/*
+ * Inode operations for immed symlinks.
+ *
+ * Unliked all other operations we do not go through the pagecache,
+ * but do all work directly on the inode.
+ */
+const struct inode_operations vxfs_immed_symlink_iops = {
+	.readlink =		generic_readlink,
+	.follow_link =		vxfs_immed_follow_link,
+};
+
+/*
+ * Address space operations for immed files and directories.
+ */
+const struct address_space_operations vxfs_immed_aops = {
+	.readpage =		vxfs_immed_readpage,
+};
+
+/**
+ * vxfs_immed_follow_link - follow immed symlink
+ * @dp:		dentry for the link
+ * @np:		pathname lookup data for the current path walk
+ *
+ * Description:
+ *   vxfs_immed_follow_link restarts the pathname lookup with
+ *   the data obtained from @dp.
+ *
+ * Returns:
+ *   Zero on success, else a negative error code.
+ */
+static void *
+vxfs_immed_follow_link(struct dentry *dp, struct nameidata *np)
+{
+	struct vxfs_inode_info		*vip = VXFS_INO(d_inode(dp));
+	nd_set_link(np, vip->vii_immed.vi_immed);
+	return NULL;
+}
+
+/**
+ * vxfs_immed_readpage - read part of an immed inode into pagecache
+ * @file:	file context (unused)
+ * @page:	page frame to fill in.
+ *
+ * Description:
+ *   vxfs_immed_readpage reads a part of the immed area of the
+ *   file that hosts @pp into the pagecache.
+ *
+ * Returns:
+ *   Zero on success, else a negative error code.
+ *
+ * Locking status:
+ *   @page is locked and will be unlocked.
+ */
+static int
+vxfs_immed_readpage(struct file *fp, struct page *pp)
+{
+	struct vxfs_inode_info	*vip = VXFS_INO(pp->mapping->host);
+	u_int64_t	offset = (u_int64_t)pp->index << PAGE_CACHE_SHIFT;
+	caddr_t		kaddr;
+
+	kaddr = kmap(pp);
+	memcpy(kaddr, vip->vii_immed.vi_immed + offset, PAGE_CACHE_SIZE);
+	kunmap(pp);
+	
+	flush_dcache_page(pp);
+	SetPageUptodate(pp);
+        unlock_page(pp);
+
+	return 0;
+}
-- 
cgit v1.2.3-54-g00ecf