[S390] s390_hypfs: Add new attributes

In order to access the data of the hypfs diagnose calls from user
space also in binary form, this patch adds two new attributes in
debugfs:
 * z/VM: s390_hypfs/d2fc_bin
 * LPAR: s390_hypfs/d204_bin

Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>

1 files changed, 24 insertions, 16 deletions

diff --git a/arch/s390/hypfs/inode.c b/arch/s390/hypfs/inode.c
index 95c1aaac06cd..6b120f073043 100644
--- a/arch/s390/hypfs/inode.c
+++ b/arch/s390/hypfs/inode.c
@@ -46,6 +46,8 @@ static const struct super_operations hypfs_s_ops;
 /* start of list of all dentries, which have to be deleted on update */
 static struct dentry *hypfs_last_dentry;
 
+struct dentry *hypfs_dbfs_dir;
+
 static void hypfs_update_update(struct super_block *sb)
 {
 	struct hypfs_sb_info *sb_info = sb->s_fs_info;
@@ -468,20 +470,22 @@ static int __init hypfs_init(void)
 {
 	int rc;
 
-	if (MACHINE_IS_VM) {
-		if (hypfs_vm_init())
-			/* no diag 2fc, just exit */
-			return -ENODATA;
-	} else {
-		if (hypfs_diag_init()) {
-			rc = -ENODATA;
-			goto fail_diag;
-		}
+	hypfs_dbfs_dir = debugfs_create_dir("s390_hypfs", NULL);
+	if (IS_ERR(hypfs_dbfs_dir))
+		return PTR_ERR(hypfs_dbfs_dir);
+
+	if (hypfs_diag_init()) {
+		rc = -ENODATA;
+		goto fail_debugfs_remove;
+	}
+	if (hypfs_vm_init()) {
+		rc = -ENODATA;
+		goto fail_hypfs_diag_exit;
 	}
 	s390_kobj = kobject_create_and_add("s390", hypervisor_kobj);
 	if (!s390_kobj) {
 		rc = -ENOMEM;
-		goto fail_sysfs;
+		goto fail_hypfs_vm_exit;
 	}
 	rc = register_filesystem(&hypfs_type);
 	if (rc)
@@ -490,18 +494,22 @@ static int __init hypfs_init(void)
 
 fail_filesystem:
 	kobject_put(s390_kobj);
-fail_sysfs:
-	if (!MACHINE_IS_VM)
-		hypfs_diag_exit();
-fail_diag:
+fail_hypfs_vm_exit:
+	hypfs_vm_exit();
+fail_hypfs_diag_exit:
+	hypfs_diag_exit();
+fail_debugfs_remove:
+	debugfs_remove(hypfs_dbfs_dir);
+
 	pr_err("Initialization of hypfs failed with rc=%i\n", rc);
 	return rc;
 }
 
 static void __exit hypfs_exit(void)
 {
-	if (!MACHINE_IS_VM)
-		hypfs_diag_exit();
+	hypfs_diag_exit();
+	hypfs_vm_exit();
+	debugfs_remove(hypfs_dbfs_dir);
 	unregister_filesystem(&hypfs_type);
 	kobject_put(s390_kobj);
 }