Revert "xen/privcmd: create address space to allow writable mmaps"

This reverts commit 24a89b5be4cf2b7f1b49b56b6cb4a7b71fccf241.

We should no longer need an address space now that we're correctly
setting VM_PFNMAP on our vmas.

Conflicts:

	drivers/xen/xenfs/super.c

Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com>

diff --git a/drivers/xen/xenfs/super.c b/drivers/xen/xenfs/super.c
index 990ee42..1aa3897 100644 (file)
--- a/drivers/xen/xenfs/super.c
+++ b/drivers/xen/xenfs/super.c
@@ -12,8 +12,6 @@
 #include <linux/module.h>
 #include <linux/fs.h>
 #include <linux/magic.h>
-#include <linux/mm.h>
-#include <linux/backing-dev.h>
 
 #include <xen/xen.h>
 
@@ -24,28 +22,12 @@
 MODULE_DESCRIPTION("Xen filesystem");
 MODULE_LICENSE("GPL");
 
-static int xenfs_set_page_dirty(struct page *page)
-{
-       return !TestSetPageDirty(page);
-}
-
-static const struct address_space_operations xenfs_aops = {
-       .set_page_dirty = xenfs_set_page_dirty,
-};
-
-static struct backing_dev_info xenfs_backing_dev_info = {
-       .ra_pages       = 0,    /* No readahead */
-       .capabilities   = BDI_CAP_NO_ACCT_AND_WRITEBACK,
-};
-
 static struct inode *xenfs_make_inode(struct super_block *sb, int mode)
 {
        struct inode *ret = new_inode(sb);
 
        if (ret) {
                ret->i_mode = mode;
-               ret->i_mapping->a_ops = &xenfs_aops;
-               ret->i_mapping->backing_dev_info = &xenfs_backing_dev_info;
                ret->i_uid = ret->i_gid = 0;
                ret->i_blocks = 0;
                ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME;
@@ -137,25 +119,11 @@ static struct file_system_type xenfs_type = {
 
 static int __init xenfs_init(void)
 {
-       int err;
-       if (!xen_domain()) {
-               printk(KERN_INFO "xenfs: not registering filesystem on non-xen platform\n");
-               return 0;
-       }
-
-       err = register_filesystem(&xenfs_type);
-       if (err) {
-               printk(KERN_ERR "xenfs: Unable to register filesystem!\n");
-               goto out;
-       }
-
-       err = bdi_init(&xenfs_backing_dev_info);
-       if (err)
-               unregister_filesystem(&xenfs_type);
-
- out:
+       if (xen_domain())
+               return register_filesystem(&xenfs_type);
 
-       return err;
+       printk(KERN_INFO "XENFS: not registering filesystem on non-xen platform\n");
+       return 0;
 }
 
 static void __exit xenfs_exit(void)