#define CIFS_MAGIC_NUMBER 0xFF534D42   /* the first four bytes of SMB PDUs */
 
 #ifdef CONFIG_CIFS_QUOTA
-static struct quotactl_ops cifs_quotactl_ops;
+static const struct quotactl_ops cifs_quotactl_ops;
 #endif /* QUOTA */
 
 int cifsFYI = 0;
        return rc;
 }
 
-static struct quotactl_ops cifs_quotactl_ops = {
+static const struct quotactl_ops cifs_quotactl_ops = {
        .set_xquota     = cifs_xquota_set,
        .get_xquota     = cifs_xquota_get,
        .set_xstate     = cifs_xstate_set,
 
        .destroy_dquot  = dquot_destroy,
 };
 
-static struct quotactl_ops ext3_qctl_operations = {
+static const struct quotactl_ops ext3_qctl_operations = {
        .quota_on       = ext3_quota_on,
        .quota_off      = vfs_quota_off,
        .quota_sync     = vfs_quota_sync,
 
        .destroy_dquot  = dquot_destroy,
 };
 
-static struct quotactl_ops ext4_qctl_operations = {
+static const struct quotactl_ops ext4_qctl_operations = {
        .quota_on       = ext4_quota_on,
        .quota_off      = vfs_quota_off,
        .quota_sync     = vfs_quota_sync,
 
        return vfs_quota_disable(sb, type, DQUOT_LIMITS_ENABLED);
 }
 
-static struct quotactl_ops ocfs2_quotactl_ops = {
+static const struct quotactl_ops ocfs2_quotactl_ops = {
        .quota_on       = ocfs2_quota_on,
        .quota_off      = ocfs2_quota_off,
        .quota_sync     = vfs_quota_sync,
 
 }
 EXPORT_SYMBOL(vfs_set_dqinfo);
 
-struct quotactl_ops vfs_quotactl_ops = {
+const struct quotactl_ops vfs_quotactl_ops = {
        .quota_on       = vfs_quota_on,
        .quota_off      = vfs_quota_off,
        .quota_sync     = vfs_quota_sync,
 
        .destroy_dquot  = dquot_destroy,
 };
 
-static struct quotactl_ops reiserfs_qctl_operations = {
+static const struct quotactl_ops reiserfs_qctl_operations = {
        .quota_on = reiserfs_quota_on,
        .quota_off = vfs_quota_off,
        .quota_sync = vfs_quota_sync,
 
        return -xfs_qm_scall_setqlim(mp, id, xfs_quota_type(type), fdq);
 }
 
-struct quotactl_ops xfs_quotactl_operations = {
+const struct quotactl_ops xfs_quotactl_operations = {
        .quota_sync             = xfs_fs_quota_sync,
        .get_xstate             = xfs_fs_get_xstate,
        .set_xstate             = xfs_fs_set_xstate,
 
 
 extern const struct export_operations xfs_export_operations;
 extern struct xattr_handler *xfs_xattr_handlers[];
-extern struct quotactl_ops xfs_quotactl_operations;
+extern const struct quotactl_ops xfs_quotactl_operations;
 
 #define XFS_M(sb)              ((struct xfs_mount *)((sb)->s_fs_info))
 
 
        struct file_system_type *s_type;
        const struct super_operations   *s_op;
        const struct dquot_operations   *dq_op;
-       struct quotactl_ops     *s_qcop;
+       const struct quotactl_ops       *s_qcop;
        const struct export_operations *s_export_op;
        unsigned long           s_flags;
        unsigned long           s_magic;
 
  * Operations supported for diskquotas.
  */
 extern const struct dquot_operations dquot_operations;
-extern struct quotactl_ops vfs_quotactl_ops;
+extern const struct quotactl_ops vfs_quotactl_ops;
 
 #define sb_dquot_ops (&dquot_operations)
 #define sb_quotactl_ops (&vfs_quotactl_ops)