[XFS] Avoid directly referencing the VFS inode.

In several places we directly convert from the XFS inode
to the linux (VFS) inode by a simple deference of ip->i_vnode.
We should not do this - a helper function should be used to
extract the VFS inode from the XFS inode.

Introduce the function VFS_I() to extract the VFS inode
from the XFS inode. The name was chosen to match XFS_I() which
is used to extract the XFS inode from the VFS inode.

SGI-PV: 981498

SGI-Modid: xfs-linux-melb:xfs-kern:31720a

Signed-off-by: David Chinner <david@fromorbit.com>
Signed-off-by: Niv Sardi <xaiki@sgi.com>
Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
diff --git a/fs/xfs/linux-2.6/xfs_iops.c b/fs/xfs/linux-2.6/xfs_iops.c
index e88f510..fec5ff5 100644
--- a/fs/xfs/linux-2.6/xfs_iops.c
+++ b/fs/xfs/linux-2.6/xfs_iops.c
@@ -62,7 +62,7 @@
 xfs_synchronize_atime(
 	xfs_inode_t	*ip)
 {
-	struct inode	*inode = ip->i_vnode;
+	struct inode	*inode = VFS_I(ip);
 
 	if (inode) {
 		ip->i_d.di_atime.t_sec = (__int32_t)inode->i_atime.tv_sec;
@@ -79,7 +79,7 @@
 xfs_mark_inode_dirty_sync(
 	xfs_inode_t	*ip)
 {
-	struct inode	*inode = ip->i_vnode;
+	struct inode	*inode = VFS_I(ip);
 
 	if (inode)
 		mark_inode_dirty_sync(inode);
@@ -299,7 +299,7 @@
 	if (unlikely(error))
 		goto out_free_acl;
 
-	inode = ip->i_vnode;
+	inode = VFS_I(ip);
 
 	error = xfs_init_security(inode, dir);
 	if (unlikely(error))
@@ -366,7 +366,7 @@
 		return NULL;
 	}
 
-	return d_splice_alias(cip->i_vnode, dentry);
+	return d_splice_alias(VFS_I(cip), dentry);
 }
 
 STATIC struct dentry *
@@ -399,12 +399,12 @@
 
 	/* if exact match, just splice and exit */
 	if (!ci_name.name)
-		return d_splice_alias(ip->i_vnode, dentry);
+		return d_splice_alias(VFS_I(ip), dentry);
 
 	/* else case-insensitive match... */
 	dname.name = ci_name.name;
 	dname.len = ci_name.len;
-	dentry = d_add_ci(ip->i_vnode, dentry, &dname);
+	dentry = d_add_ci(VFS_I(ip), dentry, &dname);
 	kmem_free(ci_name.name);
 	return dentry;
 }
@@ -478,7 +478,7 @@
 	if (unlikely(error))
 		goto out;
 
-	inode = cip->i_vnode;
+	inode = VFS_I(cip);
 
 	error = xfs_init_security(inode, dir);
 	if (unlikely(error))