5404 smbfs needs mmap support
Portions contributed by: Gordon Ross <gordon.w.ross@gmail.com>

@@ -230,19 +230,21 @@
          * Misc. bookkeeping
          */
         cred_t          *r_cred;        /* current credentials */
         u_offset_t      r_nextr;        /* next read offset (read-ahead) */
         long            r_mapcnt;       /* count of mmapped pages */
+        uint_t          r_inmap;        /* to serialize read/write and mmap */
         uint_t          r_count;        /* # of refs not reflect in v_count */
         uint_t          r_awcount;      /* # of outstanding async write */
         uint_t          r_gcount;       /* getattrs waiting to flush pages */
         uint_t          r_flags;        /* flags, see below */
-        uint32_t        n_flag;         /* NXXX flags below */
+        uint32_t        n_flag;         /* N--- flags below */
         uint_t          r_error;        /* async write error */
         kcondvar_t      r_cv;           /* condvar for blocked threads */
         avl_tree_t      r_dir;          /* cache of readdir responses */
         rddir_cache     *r_direof;      /* pointer to the EOF entry */
+        u_offset_t      r_modaddr;      /* address for page in writenp */
         kthread_t       *r_serial;      /* id of purging thread */
         list_t          r_indelmap;     /* list of delmap callers */
 
         /*
          * Attributes: local, and as last seen on the server.