Merge branches 'upstream/xenfs' and 'upstream/core' of git://git.kernel.org/pub/scm...
[linux-2.6.git] / drivers / xen / xenfs / super.c
index 78bfab0..d6662b7 100644 (file)
@@ -12,6 +12,8 @@
 #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>
 
 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;
+       }
+       return ret;
+}
+
+static struct dentry *xenfs_create_file(struct super_block *sb,
+                                       struct dentry *parent,
+                                       const char *name,
+                                       const struct file_operations *fops,
+                                       void *data,
+                                       int mode)
+{
+       struct dentry *dentry;
+       struct inode *inode;
+
+       dentry = d_alloc_name(parent, name);
+       if (!dentry)
+               return NULL;
+
+       inode = xenfs_make_inode(sb, S_IFREG | mode);
+       if (!inode) {
+               dput(dentry);
+               return NULL;
+       }
+
+       inode->i_fop = fops;
+       inode->i_private = data;
+
+       d_add(dentry, inode);
+       return dentry;
+}
+
 static ssize_t capabilities_read(struct file *file, char __user *buf,
                                 size_t size, loff_t *off)
 {
@@ -35,6 +93,7 @@ static ssize_t capabilities_read(struct file *file, char __user *buf,
 
 static const struct file_operations capabilities_file_ops = {
        .read = capabilities_read,
+       .llseek = default_llseek,
 };
 
 static int xenfs_fill_super(struct super_block *sb, void *data, int silent)
@@ -43,10 +102,23 @@ static int xenfs_fill_super(struct super_block *sb, void *data, int silent)
                [1] = {},
                { "xenbus", &xenbus_file_ops, S_IRUSR|S_IWUSR },
                { "capabilities", &capabilities_file_ops, S_IRUGO },
+               { "privcmd", &privcmd_file_ops, S_IRUSR|S_IWUSR },
                {""},
        };
+       int rc;
 
-       return simple_fill_super(sb, XENFS_SUPER_MAGIC, xenfs_files);
+       rc = simple_fill_super(sb, XENFS_SUPER_MAGIC, xenfs_files);
+       if (rc < 0)
+               return rc;
+
+       if (xen_initial_domain()) {
+               xenfs_create_file(sb, sb->s_root, "xsd_kva",
+                                 &xsd_kva_file_ops, NULL, S_IRUSR|S_IWUSR);
+               xenfs_create_file(sb, sb->s_root, "xsd_port",
+                                 &xsd_port_file_ops, NULL, S_IRUSR|S_IWUSR);
+       }
+
+       return rc;
 }
 
 static int xenfs_get_sb(struct file_system_type *fs_type,
@@ -65,11 +137,25 @@ static struct file_system_type xenfs_type = {
 
 static int __init xenfs_init(void)
 {
-       if (xen_domain())
-               return register_filesystem(&xenfs_type);
+       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:
 
-       printk(KERN_INFO "XENFS: not registering filesystem on non-xen platform\n");
-       return 0;
+       return err;
 }
 
 static void __exit xenfs_exit(void)