CIFS_MOUNT_RWPIDFORWARD
if (sbflags & CIFS_MOUNT_RWPIDFORWARD)
if (cifs_sb_flags(cifs_sb) & CIFS_MOUNT_RWPIDFORWARD)
sbflags |= CIFS_MOUNT_RWPIDFORWARD;
sbflags &= ~CIFS_MOUNT_RWPIDFORWARD;