diff --git a/arch/arm/src/cxd56xx/cxd56_geofence.c b/arch/arm/src/cxd56xx/cxd56_geofence.c
index 5570df9ab19b2..9c9330756a5d5 100644
--- a/arch/arm/src/cxd56xx/cxd56_geofence.c
+++ b/arch/arm/src/cxd56xx/cxd56_geofence.c
@@ -106,8 +106,8 @@ static const struct file_operations g_geofencefops =
   NULL,                 /* write */
   NULL,                 /* seek */
   cxd56_geofence_ioctl, /* ioctl */
-  NULL,                 /* truncate */
   NULL,                 /* mmap */
+  NULL,                 /* truncate */
   cxd56_geofence_poll   /* poll */
 };
 
diff --git a/arch/arm/src/cxd56xx/cxd56_gnss.c b/arch/arm/src/cxd56xx/cxd56_gnss.c
index 82381d3d0b67d..1cbef74c0918f 100644
--- a/arch/arm/src/cxd56xx/cxd56_gnss.c
+++ b/arch/arm/src/cxd56xx/cxd56_gnss.c
@@ -317,8 +317,8 @@ static const struct file_operations g_gnssfops =
   cxd56_gnss_write, /* write */
   NULL,             /* seek */
   cxd56_gnss_ioctl, /* ioctl */
-  NULL,             /* truncate */
   NULL,             /* mmap */
+  NULL,             /* truncate */
   cxd56_gnss_poll   /* poll */
 };
 
diff --git a/arch/arm/src/cxd56xx/cxd56_hostif.c b/arch/arm/src/cxd56xx/cxd56_hostif.c
index 790506052c31e..0cb04ee3dca73 100644
--- a/arch/arm/src/cxd56xx/cxd56_hostif.c
+++ b/arch/arm/src/cxd56xx/cxd56_hostif.c
@@ -145,8 +145,8 @@ static const struct file_operations g_hif_fops =
   hif_write,   /* write */
   hif_seek,    /* seek */
   hif_ioctl,   /* ioctl */
-  NULL,        /* truncate */
   NULL,        /* mmap */
+  NULL,        /* truncate */
   hif_poll     /* poll */
 #ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
   , hif_unlink /* unlink */
diff --git a/arch/arm/src/sama5/sam_tsd.c b/arch/arm/src/sama5/sam_tsd.c
index 378613179ac17..9b7137218e7a2 100644
--- a/arch/arm/src/sama5/sam_tsd.c
+++ b/arch/arm/src/sama5/sam_tsd.c
@@ -249,8 +249,8 @@ static const struct file_operations g_tsdops =
   NULL,            /* write */
   NULL,            /* seek */
   sam_tsd_ioctl,   /* ioctl */
-  NULL,            /* truncate */
   NULL,            /* mmap */
+  NULL,            /* truncate */
   sam_tsd_poll     /* poll */
 };
 
diff --git a/boards/arm/sam34/sam4l-xplained/src/sam_slcd.c b/boards/arm/sam34/sam4l-xplained/src/sam_slcd.c
index 359d3352b897b..7e0ac91777265 100644
--- a/boards/arm/sam34/sam4l-xplained/src/sam_slcd.c
+++ b/boards/arm/sam34/sam4l-xplained/src/sam_slcd.c
@@ -296,8 +296,8 @@ static const struct file_operations g_slcdops =
   slcd_write,    /* write */
   NULL,          /* seek */
   slcd_ioctl,    /* ioctl */
-  NULL,          /* truncate */
   NULL,          /* mmap */
+  NULL,          /* truncate */
   slcd_poll      /* poll */
 };
 
diff --git a/boards/arm/stm32/mikroe-stm32f4/src/stm32_touchscreen.c b/boards/arm/stm32/mikroe-stm32f4/src/stm32_touchscreen.c
index ffce500f3c2c8..fc698f8e23ce0 100644
--- a/boards/arm/stm32/mikroe-stm32f4/src/stm32_touchscreen.c
+++ b/boards/arm/stm32/mikroe-stm32f4/src/stm32_touchscreen.c
@@ -268,8 +268,8 @@ static const struct file_operations tc_fops =
   NULL,       /* write */
   NULL,       /* seek */
   tc_ioctl,   /* ioctl */
-  NULL,       /* truncate */
   NULL,       /* mmap */
+  NULL,       /* truncate */
   tc_poll     /* poll */
 };
 
diff --git a/boards/arm/stm32/stm32ldiscovery/src/stm32_lcd.c b/boards/arm/stm32/stm32ldiscovery/src/stm32_lcd.c
index f44f4ad9b1d04..64afa285ee204 100644
--- a/boards/arm/stm32/stm32ldiscovery/src/stm32_lcd.c
+++ b/boards/arm/stm32/stm32ldiscovery/src/stm32_lcd.c
@@ -346,8 +346,8 @@ static const struct file_operations g_slcdops =
   slcd_write,    /* write */
   NULL,          /* seek */
   slcd_ioctl,    /* ioctl */
-  NULL,          /* truncate */
   NULL,          /* mmap */
+  NULL,          /* truncate */
   slcd_poll      /* poll */
 };
 
diff --git a/boards/mips/pic32mx/pic32mx7mmb/src/pic32_touchscreen.c b/boards/mips/pic32mx/pic32mx7mmb/src/pic32_touchscreen.c
index 9c30839a2858a..9047e176aead7 100644
--- a/boards/mips/pic32mx/pic32mx7mmb/src/pic32_touchscreen.c
+++ b/boards/mips/pic32mx/pic32mx7mmb/src/pic32_touchscreen.c
@@ -249,8 +249,8 @@ static const struct file_operations tc_fops =
   NULL,       /* write */
   NULL,       /* seek */
   tc_ioctl,   /* ioctl */
-  NULL,       /* truncate */
   NULL,       /* mmap */
+  NULL,       /* truncate */
   tc_poll     /* poll */
 };
 
diff --git a/boards/mips/pic32mx/sure-pic32mx/src/pic32mx_lcd1602.c b/boards/mips/pic32mx/sure-pic32mx/src/pic32mx_lcd1602.c
index 682feabfc137c..0495e09f114e8 100644
--- a/boards/mips/pic32mx/sure-pic32mx/src/pic32mx_lcd1602.c
+++ b/boards/mips/pic32mx/sure-pic32mx/src/pic32mx_lcd1602.c
@@ -181,8 +181,8 @@ static const struct file_operations g_lcdops =
   lcd_write,     /* write */
   NULL,          /* seek */
   lcd_ioctl,     /* ioctl */
-  NULL,          /* truncate */
   NULL,          /* mmap */
+  NULL,          /* truncate */
   lcd_poll       /* poll */
 };
 
diff --git a/crypto/cryptodev.c b/crypto/cryptodev.c
index 749e2c0120c50..69229e350f966 100644
--- a/crypto/cryptodev.c
+++ b/crypto/cryptodev.c
@@ -125,8 +125,8 @@ static const struct file_operations g_cryptofops =
   cryptof_write,       /* write  */
   NULL,                /* seek   */
   cryptof_ioctl,       /* ioctl  */
+  NULL,                /* mmap   */
   NULL,                /* truncate */
-  NULL,                /* mmap */
   cryptof_poll         /* poll   */
 };
 
@@ -138,8 +138,8 @@ static const struct file_operations g_cryptoops =
   NULL,                /* write  */
   NULL,                /* seek   */
   cryptoioctl,         /* ioctl  */
+  NULL,                /* mmap   */
   NULL,                /* truncate */
-  NULL,                /* mmap */
   NULL                 /* poll   */
 };
 
diff --git a/drivers/analog/adc.c b/drivers/analog/adc.c
index dd60763a69dac..8c83476d10bb2 100644
--- a/drivers/analog/adc.c
+++ b/drivers/analog/adc.c
@@ -72,8 +72,8 @@ static const struct file_operations g_adc_fops =
   NULL,         /* write */
   NULL,         /* seek */
   adc_ioctl,    /* ioctl */
-  NULL,         /* truncate */
   NULL,         /* mmap */
+  NULL,         /* truncate */
   adc_poll      /* poll */
 };
 
diff --git a/drivers/analog/comp.c b/drivers/analog/comp.c
index 551da7b9ea05f..35445b656c85d 100644
--- a/drivers/analog/comp.c
+++ b/drivers/analog/comp.c
@@ -65,8 +65,8 @@ static const struct file_operations comp_fops =
   NULL,                         /* write */
   NULL,                         /* seek */
   comp_ioctl,                   /* ioctl */
-  NULL,                         /* truncate */
   NULL,                         /* mmap */
+  NULL,                         /* truncate */
   comp_poll                     /* poll */
 };
 
diff --git a/drivers/bch/bchdev_driver.c b/drivers/bch/bchdev_driver.c
index 9069d935963c5..861c683ac47a1 100644
--- a/drivers/bch/bchdev_driver.c
+++ b/drivers/bch/bchdev_driver.c
@@ -78,8 +78,8 @@ const struct file_operations bch_fops =
   bch_write,   /* write */
   bch_seek,    /* seek */
   bch_ioctl,   /* ioctl */
-  NULL,        /* truncate */
   NULL,        /* mmap */
+  NULL,        /* truncate */
   bch_poll     /* poll */
 #ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
   , bch_unlink /* unlink */
diff --git a/drivers/can/can.c b/drivers/can/can.c
index d4b26573e2ff4..6885732fd39c0 100644
--- a/drivers/can/can.c
+++ b/drivers/can/can.c
@@ -135,8 +135,8 @@ static const struct file_operations g_canops =
   can_write, /* write */
   NULL,      /* seek */
   can_ioctl, /* ioctl */
-  NULL,      /* truncate */
   NULL,      /* mmap */
+  NULL,      /* truncate */
   can_poll   /* poll */
 };
 
diff --git a/drivers/crypto/dev_urandom.c b/drivers/crypto/dev_urandom.c
index 89e8fc2e98028..8d3affd56988b 100644
--- a/drivers/crypto/dev_urandom.c
+++ b/drivers/crypto/dev_urandom.c
@@ -100,8 +100,8 @@ static const struct file_operations g_urand_fops =
   devurand_write,               /* write */
   NULL,                         /* seek */
   NULL,                         /* ioctl */
-  NULL,                         /* truncate */
   NULL,                         /* mmap */
+  NULL,                         /* truncate */
   devurand_poll                 /* poll */
 };
 
diff --git a/drivers/i2c/i2c_driver.c b/drivers/i2c/i2c_driver.c
index 57fedcb2a6fc4..d6e05a4bde057 100644
--- a/drivers/i2c/i2c_driver.c
+++ b/drivers/i2c/i2c_driver.c
@@ -99,8 +99,8 @@ static const struct file_operations i2cdrvr_fops =
   i2cdrvr_write,   /* write */
   NULL,            /* seek */
   i2cdrvr_ioctl,   /* ioctl */
-  NULL,            /* truncate */
   NULL,            /* mmap */
+  NULL,            /* truncate */
   NULL             /* poll */
 #ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
   , i2cdrvr_unlink /* unlink */
diff --git a/drivers/input/ads7843e.c b/drivers/input/ads7843e.c
index 8a825e28207b0..bed02ac0cf173 100644
--- a/drivers/input/ads7843e.c
+++ b/drivers/input/ads7843e.c
@@ -122,8 +122,8 @@ static const struct file_operations ads7843e_fops =
   NULL,             /* write */
   NULL,             /* seek */
   ads7843e_ioctl,   /* ioctl */
-  NULL,             /* truncate */
   NULL,             /* mmap */
+  NULL,             /* truncate */
   ads7843e_poll     /* poll */
 };
 
diff --git a/drivers/input/ajoystick.c b/drivers/input/ajoystick.c
index 9c71938431602..78fc1feafe8f2 100644
--- a/drivers/input/ajoystick.c
+++ b/drivers/input/ajoystick.c
@@ -135,8 +135,8 @@ static const struct file_operations ajoy_fops =
   NULL,       /* write */
   NULL,       /* seek */
   ajoy_ioctl, /* ioctl */
-  NULL,       /* truncate */
   NULL,       /* mmap */
+  NULL,       /* truncate */
   ajoy_poll   /* poll */
 };
 
diff --git a/drivers/input/button_upper.c b/drivers/input/button_upper.c
index b461a7d893e90..ebdf134f9e5b0 100644
--- a/drivers/input/button_upper.c
+++ b/drivers/input/button_upper.c
@@ -133,8 +133,8 @@ static const struct file_operations btn_fops =
   btn_write, /* write */
   NULL,      /* seek */
   btn_ioctl, /* ioctl */
-  NULL,      /* truncate */
   NULL,      /* mmap */
+  NULL,      /* truncate */
   btn_poll   /* poll */
 };
 
diff --git a/drivers/input/cypress_mbr3108.c b/drivers/input/cypress_mbr3108.c
index 59a7b2d3629b3..893296c9c9f93 100644
--- a/drivers/input/cypress_mbr3108.c
+++ b/drivers/input/cypress_mbr3108.c
@@ -224,8 +224,8 @@ static const struct file_operations g_mbr3108_fileops =
   mbr3108_write,  /* write */
   NULL,           /* seek */
   NULL,           /* ioctl */
-  NULL,           /* truncate */
   NULL,           /* mmap */
+  NULL,           /* truncate */
   mbr3108_poll    /* poll */
 };
 
diff --git a/drivers/input/djoystick.c b/drivers/input/djoystick.c
index 8ab905b13750b..fcff04fb6c6f1 100644
--- a/drivers/input/djoystick.c
+++ b/drivers/input/djoystick.c
@@ -135,8 +135,8 @@ static const struct file_operations djoy_fops =
   NULL,       /* write */
   NULL,       /* seek */
   djoy_ioctl, /* ioctl */
-  NULL,       /* truncate */
   NULL,       /* mmap */
+  NULL,       /* truncate */
   djoy_poll   /* poll */
 };
 
diff --git a/drivers/input/ft5x06.c b/drivers/input/ft5x06.c
index 6b85c17144ece..aeea190c0a240 100644
--- a/drivers/input/ft5x06.c
+++ b/drivers/input/ft5x06.c
@@ -176,8 +176,8 @@ static const struct file_operations ft5x06_fops =
   NULL,           /* write */
   NULL,           /* seek */
   ft5x06_ioctl,   /* ioctl */
-  NULL,           /* truncate */
   NULL,           /* mmap */
+  NULL,           /* truncate */
   ft5x06_poll     /* poll */
 };
 
diff --git a/drivers/input/keyboard_upper.c b/drivers/input/keyboard_upper.c
index e4282dbf6a4e3..7dfa28bfcba37 100644
--- a/drivers/input/keyboard_upper.c
+++ b/drivers/input/keyboard_upper.c
@@ -88,8 +88,8 @@ static const struct file_operations g_keyboard_fops =
   keyboard_write, /* write */
   NULL,           /* seek */
   NULL,           /* ioctl */
-  NULL,           /* truncate */
   NULL,           /* mmap */
+  NULL,           /* truncate */
   keyboard_poll   /* poll */
 };
 
diff --git a/drivers/input/max11802.c b/drivers/input/max11802.c
index e2757482cd8ab..a4aec28f79d6c 100644
--- a/drivers/input/max11802.c
+++ b/drivers/input/max11802.c
@@ -115,8 +115,8 @@ static const struct file_operations max11802_fops =
   NULL,             /* write */
   NULL,             /* seek */
   max11802_ioctl,   /* ioctl */
-  NULL,             /* truncate */
   NULL,             /* mmap */
+  NULL,             /* truncate */
   max11802_poll     /* poll */
 };
 
diff --git a/drivers/input/mxt.c b/drivers/input/mxt.c
index 3f8ac456b73e9..1ac9a7f88c0e0 100644
--- a/drivers/input/mxt.c
+++ b/drivers/input/mxt.c
@@ -280,8 +280,8 @@ static const struct file_operations mxt_fops =
   NULL,        /* write */
   NULL,        /* seek */
   mxt_ioctl,   /* ioctl */
-  NULL,        /* truncate */
   NULL,        /* mmap */
+  NULL,        /* truncate */
   mxt_poll     /* poll */
 };
 
diff --git a/drivers/input/spq10kbd.c b/drivers/input/spq10kbd.c
index 250dcf942f82f..deb78284ff28e 100644
--- a/drivers/input/spq10kbd.c
+++ b/drivers/input/spq10kbd.c
@@ -255,8 +255,8 @@ static const struct file_operations g_hidkbd_fops =
   spq10kbd_write,            /* write */
   NULL,                      /* seek */
   NULL,                      /* ioctl */
-  NULL,                      /* truncate */
   NULL,                      /* mmap */
+  NULL,                      /* truncate */
   spq10kbd_poll              /* poll */
 };
 
diff --git a/drivers/input/stmpe811_tsc.c b/drivers/input/stmpe811_tsc.c
index c87cb7b1b2327..9a88393820dfa 100644
--- a/drivers/input/stmpe811_tsc.c
+++ b/drivers/input/stmpe811_tsc.c
@@ -124,8 +124,8 @@ static const struct file_operations g_stmpe811fops =
   NULL,             /* write */
   NULL,             /* seek */
   stmpe811_ioctl,   /* ioctl */
-  NULL,             /* truncate */
   NULL,             /* mmap */
+  NULL,             /* truncate */
   stmpe811_poll     /* poll */
 };
 
diff --git a/drivers/input/touchscreen_upper.c b/drivers/input/touchscreen_upper.c
index 5a987d7b81fcc..3bedb950365d1 100644
--- a/drivers/input/touchscreen_upper.c
+++ b/drivers/input/touchscreen_upper.c
@@ -90,8 +90,8 @@ static const struct file_operations g_touch_fops =
   touch_write,    /* write */
   NULL,           /* seek */
   touch_ioctl,    /* ioctl */
-  NULL,           /* truncate */
   NULL,           /* mmap */
+  NULL,           /* truncate */
   touch_poll      /* poll */
 };
 
diff --git a/drivers/input/tsc2007.c b/drivers/input/tsc2007.c
index 8a65d862b8966..20c292b2fc7e4 100644
--- a/drivers/input/tsc2007.c
+++ b/drivers/input/tsc2007.c
@@ -209,8 +209,8 @@ static const struct file_operations tsc2007_fops =
   NULL,            /* write */
   NULL,            /* seek */
   tsc2007_ioctl,   /* ioctl */
-  NULL,            /* truncate */
   NULL,            /* mmap */
+  NULL,            /* truncate */
   tsc2007_poll     /* poll */
 };
 
diff --git a/drivers/lcd/ft80x.c b/drivers/lcd/ft80x.c
index c75aaeea4b044..fe1ec684e5ec2 100644
--- a/drivers/lcd/ft80x.c
+++ b/drivers/lcd/ft80x.c
@@ -134,8 +134,8 @@ static const struct file_operations g_ft80x_fops =
   ft80x_write,   /* write */
   NULL,          /* seek */
   ft80x_ioctl,   /* ioctl */
-  NULL,          /* truncate */
   NULL,          /* mmap */
+  NULL,          /* truncate */
   NULL           /* poll */
 #ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
   , ft80x_unlink /* unlink */
diff --git a/drivers/lcd/pcf8574_lcd_backpack.c b/drivers/lcd/pcf8574_lcd_backpack.c
index 0a0ec4dbf2ccb..011d888a5b720 100644
--- a/drivers/lcd/pcf8574_lcd_backpack.c
+++ b/drivers/lcd/pcf8574_lcd_backpack.c
@@ -117,8 +117,8 @@ static const struct file_operations g_pcf8574_lcd_fops =
   pcf8574_lcd_write,            /* write */
   pcf8574_lcd_seek,             /* seek */
   pcf8574_lcd_ioctl,            /* ioctl */
-  NULL,                         /* truncate */
   NULL,                         /* mmap */
+  NULL,                         /* truncate */
   pcf8574_lcd_poll              /* poll */
 #ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
   , pcf8574_lcd_unlink          /* unlink */
diff --git a/drivers/lcd/tda19988.c b/drivers/lcd/tda19988.c
index 16a00010895fd..a3fa9f9ca48f6 100644
--- a/drivers/lcd/tda19988.c
+++ b/drivers/lcd/tda19988.c
@@ -170,8 +170,8 @@ static const struct file_operations tda19988_fops =
   tda19988_write,    /* write */
   tda19988_seek,     /* seek */
   tda19988_ioctl,    /* ioctl */
-  NULL,              /* truncate */
   NULL,              /* mmap */
+  NULL,              /* truncate */
   tda19988_poll      /* poll */
 #ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
   , tda19988_unlink  /* unlink */
diff --git a/drivers/misc/dev_null.c b/drivers/misc/dev_null.c
index 8a063a8a99283..6f1b78fc54cfc 100644
--- a/drivers/misc/dev_null.c
+++ b/drivers/misc/dev_null.c
@@ -57,8 +57,8 @@ static const struct file_operations devnull_fops =
   devnull_write, /* write */
   NULL,          /* seek */
   NULL,          /* ioctl */
-  NULL,          /* truncate */
   NULL,          /* mmap */
+  NULL,          /* truncate */
   devnull_poll   /* poll */
 };
 
diff --git a/drivers/misc/dev_zero.c b/drivers/misc/dev_zero.c
index 63b9c4185d07e..59720922f53cf 100644
--- a/drivers/misc/dev_zero.c
+++ b/drivers/misc/dev_zero.c
@@ -57,8 +57,8 @@ static const struct file_operations devzero_fops =
   devzero_write, /* write */
   NULL,          /* seek */
   NULL,          /* ioctl */
-  NULL,          /* truncate */
   NULL,          /* mmap */
+  NULL,          /* truncate */
   devzero_poll   /* poll */
 };
 
diff --git a/drivers/misc/rpmsgdev.c b/drivers/misc/rpmsgdev.c
index 81e49744470ba..4023b44501e82 100644
--- a/drivers/misc/rpmsgdev.c
+++ b/drivers/misc/rpmsgdev.c
@@ -165,8 +165,8 @@ const struct file_operations g_rpmsgdev_ops =
   rpmsgdev_write,         /* write */
   rpmsgdev_seek,          /* seek */
   rpmsgdev_ioctl,         /* ioctl */
-  NULL,                   /* truncate */
   NULL,                   /* mmap */
+  NULL,                   /* truncate */
   rpmsgdev_poll           /* poll */
 };
 
diff --git a/drivers/modem/alt1250/alt1250.c b/drivers/modem/alt1250/alt1250.c
index 7e76bd199fb3d..b8481cdb08246 100644
--- a/drivers/modem/alt1250/alt1250.c
+++ b/drivers/modem/alt1250/alt1250.c
@@ -77,8 +77,8 @@ static const struct file_operations g_alt1250fops =
   NULL,          /* write */
   NULL,          /* seek */
   alt1250_ioctl, /* ioctl */
-  NULL,          /* truncate */
   NULL,          /* mmap */
+  NULL,          /* truncate */
   alt1250_poll,  /* poll */
 };
 static uint8_t g_recvbuff[ALTCOM_RX_PKT_SIZE_MAX];
diff --git a/drivers/modem/u-blox.c b/drivers/modem/u-blox.c
index 9a9f1de90d223..dbcbb5513709c 100644
--- a/drivers/modem/u-blox.c
+++ b/drivers/modem/u-blox.c
@@ -114,8 +114,8 @@ static const struct file_operations ubxmdm_fops =
   ubxmdm_write, /* write */
   NULL,         /* seek */
   ubxmdm_ioctl, /* ioctl */
-  NULL,         /* truncate */
   NULL,         /* mmap */
+  NULL,         /* truncate */
   ubxmdm_poll   /* poll */
 };
 
diff --git a/drivers/mtd/mtd_config.c b/drivers/mtd/mtd_config.c
index fb6659fdf9e6c..0da348c2fec51 100644
--- a/drivers/mtd/mtd_config.c
+++ b/drivers/mtd/mtd_config.c
@@ -119,8 +119,8 @@ static const struct file_operations mtdconfig_fops =
   NULL,            /* write */
   NULL,            /* seek */
   mtdconfig_ioctl, /* ioctl */
-  NULL,            /* truncate */
   NULL,            /* mmap */
+  NULL,            /* truncate */
   mtdconfig_poll   /* poll */
 };
 
diff --git a/drivers/net/telnet.c b/drivers/net/telnet.c
index 32c88f200acfe..63e8ef5ef3d72 100644
--- a/drivers/net/telnet.c
+++ b/drivers/net/telnet.c
@@ -190,8 +190,8 @@ static const struct file_operations g_telnet_fops =
   telnet_write,  /* write */
   NULL,          /* seek */
   telnet_ioctl,  /* ioctl */
-  NULL,          /* truncate */
   NULL,          /* mmap */
+  NULL,          /* truncate */
   telnet_poll    /* poll */
 };
 
diff --git a/drivers/net/tun.c b/drivers/net/tun.c
index 81fa0b1d9c58e..47d32be57d2a8 100644
--- a/drivers/net/tun.c
+++ b/drivers/net/tun.c
@@ -219,8 +219,8 @@ static const struct file_operations g_tun_file_ops =
   tun_write,    /* write */
   NULL,         /* seek */
   tun_ioctl,    /* ioctl */
-  NULL,         /* truncate */
   NULL,         /* mmap */
+  NULL,         /* truncate */
   tun_poll      /* poll */
 };
 
diff --git a/drivers/pipes/fifo.c b/drivers/pipes/fifo.c
index 283f1614ff8f1..938708c41e2d1 100644
--- a/drivers/pipes/fifo.c
+++ b/drivers/pipes/fifo.c
@@ -47,8 +47,8 @@ static const struct file_operations g_fifo_fops =
   pipecommon_write,    /* write */
   NULL,                /* seek */
   pipecommon_ioctl,    /* ioctl */
-  NULL,                /* truncate */
   NULL,                /* mmap */
+  NULL,                /* truncate */
   pipecommon_poll      /* poll */
 #ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
   , pipecommon_unlink  /* unlink */
diff --git a/drivers/pipes/pipe.c b/drivers/pipes/pipe.c
index 5bc8716d5bfee..1993597347772 100644
--- a/drivers/pipes/pipe.c
+++ b/drivers/pipes/pipe.c
@@ -61,8 +61,8 @@ static const struct file_operations g_pipe_fops =
   pipecommon_write,    /* write */
   NULL,                /* seek */
   pipecommon_ioctl,    /* ioctl */
-  NULL,                /* truncate */
   NULL,                /* mmap */
+  NULL,                /* truncate */
   pipecommon_poll      /* poll */
 };
 
diff --git a/drivers/power/battery/battery_charger.c b/drivers/power/battery/battery_charger.c
index bc005ca7be0e3..b2b18da2d60ac 100644
--- a/drivers/power/battery/battery_charger.c
+++ b/drivers/power/battery/battery_charger.c
@@ -91,8 +91,8 @@ static const struct file_operations g_batteryops =
   bat_charger_write,   /* write */
   NULL,                /* seek */
   bat_charger_ioctl,   /* ioctl */
-  NULL,                /* truncate */
   NULL,                /* mmap */
+  NULL,                /* truncate */
   bat_charger_poll     /* poll */
 };
 
diff --git a/drivers/power/battery/battery_gauge.c b/drivers/power/battery/battery_gauge.c
index 395ad51a84797..b0cbccda0b98d 100644
--- a/drivers/power/battery/battery_gauge.c
+++ b/drivers/power/battery/battery_gauge.c
@@ -93,8 +93,8 @@ static const struct file_operations g_batteryops =
   bat_gauge_write,  /* write */
   NULL,             /* seek */
   bat_gauge_ioctl,  /* ioctl */
-  NULL,             /* truncate */
   NULL,             /* mmap */
+  NULL,             /* truncate */
   bat_gauge_poll    /* poll */
 };
 
diff --git a/drivers/power/battery/battery_monitor.c b/drivers/power/battery/battery_monitor.c
index 447f14d1ec030..49faab7d25b98 100644
--- a/drivers/power/battery/battery_monitor.c
+++ b/drivers/power/battery/battery_monitor.c
@@ -92,8 +92,8 @@ static const struct file_operations g_batteryops =
   bat_monitor_write,   /* write */
   NULL,                /* seek */
   bat_monitor_ioctl,   /* ioctl */
-  NULL,                /* truncate */
   NULL,                /* mmap */
+  NULL,                /* truncate */
   bat_monitor_poll     /* poll */
 };
 
diff --git a/drivers/rc/lirc_dev.c b/drivers/rc/lirc_dev.c
index b63540e01fe39..0cb65fc3c4b31 100644
--- a/drivers/rc/lirc_dev.c
+++ b/drivers/rc/lirc_dev.c
@@ -103,8 +103,8 @@ static const struct file_operations g_lirc_fops =
   lirc_write,  /* write */
   NULL,        /* seek */
   lirc_ioctl,  /* ioctl */
-  NULL,        /* truncate */
   NULL,        /* mmap */
+  NULL,        /* truncate */
   lirc_poll    /* poll */
 };
 
diff --git a/drivers/sensors/aht10.c b/drivers/sensors/aht10.c
index 514e0c96eb275..33c9fdbb25530 100644
--- a/drivers/sensors/aht10.c
+++ b/drivers/sensors/aht10.c
@@ -116,8 +116,8 @@ static const struct file_operations g_aht10fops =
   aht10_write,    /* write */
   NULL,           /* seek */
   aht10_ioctl,    /* ioctl */
-  NULL,           /* truncate */
   NULL,           /* mmap */
+  NULL,           /* truncate */
   NULL            /* poll */
 #ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
   , aht10_unlink /* unlink */
diff --git a/drivers/sensors/hc_sr04.c b/drivers/sensors/hc_sr04.c
index 16001191498e6..859f36a16b6ce 100644
--- a/drivers/sensors/hc_sr04.c
+++ b/drivers/sensors/hc_sr04.c
@@ -90,8 +90,8 @@ static const struct file_operations g_hcsr04ops =
   hcsr04_write,  /* write */
   NULL,          /* seek */
   hcsr04_ioctl,  /* ioctl */
-  NULL,          /* truncate */
   NULL,          /* mmap */
+  NULL,          /* truncate */
   hcsr04_poll    /* poll */
 };
 
diff --git a/drivers/sensors/hdc1008.c b/drivers/sensors/hdc1008.c
index 44f83ed33b818..9e95abb78f864 100644
--- a/drivers/sensors/hdc1008.c
+++ b/drivers/sensors/hdc1008.c
@@ -161,8 +161,8 @@ static const struct file_operations g_hdc1008fops =
   hdc1008_write,    /* write */
   NULL,             /* seek */
   hdc1008_ioctl,    /* ioctl */
-  NULL,             /* truncate */
   NULL,             /* mmap */
+  NULL,             /* truncate */
   NULL              /* poll */
 #ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
   , hdc1008_unlink  /* unlink */
diff --git a/drivers/sensors/hts221.c b/drivers/sensors/hts221.c
index 44e7c9a1f4158..830b1c59f61a6 100644
--- a/drivers/sensors/hts221.c
+++ b/drivers/sensors/hts221.c
@@ -157,8 +157,8 @@ static const struct file_operations g_humidityops =
   hts221_write,  /* write */
   NULL,          /* seek */
   hts221_ioctl,  /* ioctl */
-  NULL,          /* truncate */
   NULL,          /* mmap */
+  NULL,          /* truncate */
   hts221_poll    /* poll */
 };
 
diff --git a/drivers/sensors/lis2dh.c b/drivers/sensors/lis2dh.c
index 554390cc4c27f..f1fcf2597d7d2 100644
--- a/drivers/sensors/lis2dh.c
+++ b/drivers/sensors/lis2dh.c
@@ -154,8 +154,8 @@ static const struct file_operations g_lis2dhops =
   lis2dh_write,  /* write */
   NULL,          /* seek */
   lis2dh_ioctl,  /* ioctl */
-  NULL,          /* truncate */
   NULL,          /* mmap */
+  NULL,          /* truncate */
   lis2dh_poll    /* poll */
 };
 
diff --git a/drivers/sensors/max44009.c b/drivers/sensors/max44009.c
index 7de5801722582..dd9c7eba45206 100644
--- a/drivers/sensors/max44009.c
+++ b/drivers/sensors/max44009.c
@@ -112,8 +112,8 @@ static const struct file_operations g_alsops =
   max44009_write,  /* write */
   NULL,            /* seek */
   max44009_ioctl,  /* ioctl */
-  NULL,            /* truncate */
   NULL,            /* mmap */
+  NULL,            /* truncate */
   max44009_poll    /* poll */
 };
 
diff --git a/drivers/sensors/scd30.c b/drivers/sensors/scd30.c
index 54317a85f0cb3..b1d56c7076913 100644
--- a/drivers/sensors/scd30.c
+++ b/drivers/sensors/scd30.c
@@ -182,8 +182,8 @@ static const struct file_operations g_scd30fops =
   scd30_write,    /* write */
   NULL,           /* seek */
   scd30_ioctl,    /* ioctl */
-  NULL,           /* truncate */
   NULL,           /* mmap */
+  NULL,           /* truncate */
   NULL            /* poll */
 #ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
   , scd30_unlink /* unlink */
diff --git a/drivers/sensors/scd41.c b/drivers/sensors/scd41.c
index 74288c4f5b69d..c8a771390b75e 100644
--- a/drivers/sensors/scd41.c
+++ b/drivers/sensors/scd41.c
@@ -190,8 +190,8 @@ static const struct file_operations g_scd41fops =
   scd41_write,    /* write */
   NULL,           /* seek */
   scd41_ioctl,    /* ioctl */
-  NULL,           /* truncate */
   NULL,           /* mmap */
+  NULL,           /* truncate */
   NULL            /* poll */
 #ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
   , scd41_unlink /* unlink */
diff --git a/drivers/sensors/sensor.c b/drivers/sensors/sensor.c
index 1143592db14ef..b10e568310633 100644
--- a/drivers/sensors/sensor.c
+++ b/drivers/sensors/sensor.c
@@ -167,8 +167,8 @@ static const struct file_operations g_sensor_fops =
   sensor_write,   /* write */
   NULL,           /* seek  */
   sensor_ioctl,   /* ioctl */
-  NULL,           /* truncate */
   NULL,           /* mmap */
+  NULL,           /* truncate */
   sensor_poll     /* poll  */
 };
 
diff --git a/drivers/sensors/sgp30.c b/drivers/sensors/sgp30.c
index e9ad20336e1d3..bc7e528ca5e4d 100644
--- a/drivers/sensors/sgp30.c
+++ b/drivers/sensors/sgp30.c
@@ -159,8 +159,8 @@ static const struct file_operations g_sgp30fops =
   sgp30_write,    /* write */
   NULL,           /* seek */
   sgp30_ioctl,    /* ioctl */
-  NULL,           /* truncate */
   NULL,           /* mmap */
+  NULL,           /* truncate */
   NULL            /* poll */
 #ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
   , sgp30_unlink /* unlink */
diff --git a/drivers/sensors/sht21.c b/drivers/sensors/sht21.c
index e3146638135ff..806aa6053ba6b 100644
--- a/drivers/sensors/sht21.c
+++ b/drivers/sensors/sht21.c
@@ -131,8 +131,8 @@ static const struct file_operations g_sht21fops =
   sht21_write,    /* write */
   NULL,           /* seek */
   sht21_ioctl,    /* ioctl */
-  NULL,           /* truncate */
   NULL,           /* mmap */
+  NULL,           /* truncate */
   NULL            /* poll */
 #ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
   , sht21_unlink /* unlink */
diff --git a/drivers/sensors/sht3x.c b/drivers/sensors/sht3x.c
index ffcb146ce2a70..604d78b54a480 100644
--- a/drivers/sensors/sht3x.c
+++ b/drivers/sensors/sht3x.c
@@ -170,8 +170,8 @@ static const struct file_operations g_sht3xfops =
   sht3x_write,    /* write */
   NULL,           /* seek */
   sht3x_ioctl,    /* ioctl */
-  NULL,           /* truncate */
   NULL,           /* mmap */
+  NULL,           /* truncate */
   NULL            /* poll */
 #ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
   , sht3x_unlink  /* unlink */
diff --git a/drivers/sensors/sps30.c b/drivers/sensors/sps30.c
index 37f7f010c0efa..b5434e5700c23 100644
--- a/drivers/sensors/sps30.c
+++ b/drivers/sensors/sps30.c
@@ -175,8 +175,8 @@ static const struct file_operations g_sps30fops =
   sps30_write,    /* write */
   NULL,           /* seek */
   sps30_ioctl,    /* ioctl */
-  NULL,           /* truncate */
   NULL,           /* mmap */
+  NULL,           /* truncate */
   NULL            /* poll */
 #ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
   , sps30_unlink /* unlink */
diff --git a/drivers/sensors/usensor.c b/drivers/sensors/usensor.c
index e0d1dda2a5174..9f472e24e54b9 100644
--- a/drivers/sensors/usensor.c
+++ b/drivers/sensors/usensor.c
@@ -81,8 +81,8 @@ static const struct file_operations g_usensor_fops =
   usensor_write, /* write */
   NULL,          /* seek  */
   usensor_ioctl, /* ioctl */
-  NULL,          /* truncate */
   NULL,          /* mmap */
+  NULL,          /* truncate */
   NULL,          /* poll  */
 };
 
diff --git a/drivers/serial/pty.c b/drivers/serial/pty.c
index c06cb6fd26e07..6fa78a0b66b45 100644
--- a/drivers/serial/pty.c
+++ b/drivers/serial/pty.c
@@ -127,8 +127,8 @@ static const struct file_operations g_pty_fops =
   pty_write,     /* write */
   NULL,          /* seek */
   pty_ioctl,     /* ioctl */
-  NULL,          /* truncate */
   NULL,          /* mmap */
+  NULL,          /* truncate */
   pty_poll       /* poll */
 #ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
   , pty_unlink   /* unlink */
diff --git a/drivers/serial/serial.c b/drivers/serial/serial.c
index 0fdabee16e114..d68c8a89a66a2 100644
--- a/drivers/serial/serial.c
+++ b/drivers/serial/serial.c
@@ -126,8 +126,8 @@ static const struct file_operations g_serialops =
   uart_write, /* write */
   NULL,       /* seek */
   uart_ioctl, /* ioctl */
-  NULL,       /* truncate */
   NULL,       /* mmap */
+  NULL,       /* truncate */
   uart_poll   /* poll */
 };
 
diff --git a/drivers/serial/uart_bth4.c b/drivers/serial/uart_bth4.c
index 97e9717ae3591..7042dec187f3c 100644
--- a/drivers/serial/uart_bth4.c
+++ b/drivers/serial/uart_bth4.c
@@ -90,8 +90,8 @@ static const struct file_operations g_uart_bth4_ops =
   uart_bth4_write,  /* write */
   NULL,             /* seek */
   uart_bth4_ioctl,  /* ioctl */
-  NULL,             /* truncate */
   NULL,             /* mmap */
+  NULL,             /* truncate */
   uart_bth4_poll    /* poll */
 };
 
diff --git a/drivers/spi/spi_driver.c b/drivers/spi/spi_driver.c
index 583344d72d4ba..7dadf3f4aa1c3 100644
--- a/drivers/spi/spi_driver.c
+++ b/drivers/spi/spi_driver.c
@@ -99,8 +99,8 @@ static const struct file_operations spidrvr_fops =
   spidrvr_write,   /* write */
   NULL,            /* seek */
   spidrvr_ioctl,   /* ioctl */
-  NULL,            /* truncate */
   NULL,            /* mmap */
+  NULL,            /* truncate */
   NULL             /* poll */
 #ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
   , spidrvr_unlink /* unlink */
diff --git a/drivers/spi/spi_slave_driver.c b/drivers/spi/spi_slave_driver.c
index c2eaff7672399..bcf454379a671 100644
--- a/drivers/spi/spi_slave_driver.c
+++ b/drivers/spi/spi_slave_driver.c
@@ -127,8 +127,8 @@ static const struct file_operations g_spislavefops =
   spi_slave_write,              /* write */
   NULL,                         /* seek */
   NULL,                         /* ioctl */
-  NULL,                         /* truncate */
   NULL,                         /* mmap */
+  NULL,                         /* truncate */
   NULL                          /* poll */
 #ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
   , spi_slave_unlink            /* unlink */
diff --git a/drivers/syslog/ramlog.c b/drivers/syslog/ramlog.c
index b87765e24d2a9..38c5c5392b124 100644
--- a/drivers/syslog/ramlog.c
+++ b/drivers/syslog/ramlog.c
@@ -114,8 +114,8 @@ static const struct file_operations g_ramlogfops =
   ramlog_file_write, /* write */
   NULL,              /* seek */
   ramlog_file_ioctl, /* ioctl */
-  NULL,              /* truncate */
   NULL,              /* mmap */
+  NULL,              /* truncate */
   ramlog_file_poll   /* poll */
 };
 
diff --git a/drivers/timers/rtc.c b/drivers/timers/rtc.c
index b77405bd1ade0..14abf542ababe 100644
--- a/drivers/timers/rtc.c
+++ b/drivers/timers/rtc.c
@@ -129,8 +129,8 @@ static const struct file_operations rtc_fops =
   rtc_write,     /* write */
   NULL,          /* seek */
   rtc_ioctl,     /* ioctl */
-  NULL,          /* truncate */
   NULL,          /* mmap */
+  NULL,          /* truncate */
   NULL           /* poll */
 #ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
   , rtc_unlink   /* unlink */
diff --git a/drivers/usbdev/adb.c b/drivers/usbdev/adb.c
index 0639df30c70a3..4c870425535df 100755
--- a/drivers/usbdev/adb.c
+++ b/drivers/usbdev/adb.c
@@ -254,8 +254,8 @@ static const struct file_operations g_adb_fops =
   adb_char_write, /* write */
   NULL,           /* seek */
   NULL,           /* ioctl */
-  NULL,           /* truncate */
   NULL,           /* mmap */
+  NULL,           /* truncate */
   adb_char_poll   /* poll */
 };
 
diff --git a/drivers/usbhost/usbhost_cdcmbim.c b/drivers/usbhost/usbhost_cdcmbim.c
index 94834835835b4..d4919c0f674b0 100644
--- a/drivers/usbhost/usbhost_cdcmbim.c
+++ b/drivers/usbhost/usbhost_cdcmbim.c
@@ -347,8 +347,8 @@ static const struct file_operations cdcwdm_fops =
   cdcwdm_write,  /* write */
   NULL,          /* seek */
   NULL,          /* ioctl */
-  NULL,          /* truncate */
   NULL,          /* mmap */
+  NULL,          /* truncate */
   cdcwdm_poll    /* poll */
 };
 
diff --git a/drivers/usbhost/usbhost_hidkbd.c b/drivers/usbhost/usbhost_hidkbd.c
index bd470ccdea53c..73d062c8b5966 100644
--- a/drivers/usbhost/usbhost_hidkbd.c
+++ b/drivers/usbhost/usbhost_hidkbd.c
@@ -341,8 +341,8 @@ static const struct file_operations g_hidkbd_fops =
   usbhost_write,            /* write */
   NULL,                     /* seek */
   NULL,                     /* ioctl */
-  NULL,                     /* truncate */
   NULL,                     /* mmap */
+  NULL,                     /* truncate */
   usbhost_poll              /* poll */
 };
 
diff --git a/drivers/usbhost/usbhost_hidmouse.c b/drivers/usbhost/usbhost_hidmouse.c
index 8b1351bb710d9..1a582df775fc4 100644
--- a/drivers/usbhost/usbhost_hidmouse.c
+++ b/drivers/usbhost/usbhost_hidmouse.c
@@ -391,8 +391,8 @@ static const struct file_operations g_hidmouse_fops =
   usbhost_write,           /* write */
   NULL,                    /* seek */
   NULL,                    /* ioctl */
-  NULL,                    /* truncate */
   NULL,                    /* mmap */
+  NULL,                    /* truncate */
   usbhost_poll             /* poll */
 };
 
diff --git a/drivers/usbhost/usbhost_xboxcontroller.c b/drivers/usbhost/usbhost_xboxcontroller.c
index 0cb83a238cdb0..d90f02e2ceb93 100644
--- a/drivers/usbhost/usbhost_xboxcontroller.c
+++ b/drivers/usbhost/usbhost_xboxcontroller.c
@@ -296,8 +296,8 @@ static const struct file_operations g_xboxcontroller_fops =
   usbhost_write,            /* write */
   NULL,                     /* seek */
   usbhost_ioctl,            /* ioctl */
-  NULL,                     /* truncate */
   NULL,                     /* mmap */
+  NULL,                     /* truncate */
   usbhost_poll              /* poll */
 };
 
diff --git a/drivers/usbmisc/fusb301.c b/drivers/usbmisc/fusb301.c
index 12db5b430d9fd..ec4c061f86a52 100644
--- a/drivers/usbmisc/fusb301.c
+++ b/drivers/usbmisc/fusb301.c
@@ -94,8 +94,8 @@ static const struct file_operations g_fusb301ops =
   fusb301_write, /* write */
   NULL,          /* seek */
   fusb301_ioctl, /* ioctl */
-  NULL,          /* truncate */
   NULL,          /* mmap */
+  NULL,          /* truncate */
   fusb301_poll   /* poll */
 };
 
diff --git a/drivers/usbmisc/fusb303.c b/drivers/usbmisc/fusb303.c
index b90cde464052c..e633cf54ca183 100644
--- a/drivers/usbmisc/fusb303.c
+++ b/drivers/usbmisc/fusb303.c
@@ -128,8 +128,8 @@ static const struct file_operations g_fusb303ops =
   fusb303_write, /* write */
   NULL,          /* seek */
   fusb303_ioctl, /* ioctl */
-  NULL,          /* truncate */
   NULL,          /* mmap */
+  NULL,          /* truncate */
   fusb303_poll   /* poll */
 };
 
diff --git a/drivers/usrsock/usrsock_dev.c b/drivers/usrsock/usrsock_dev.c
index cdefc5e70bf23..d2cb9adc9b626 100644
--- a/drivers/usrsock/usrsock_dev.c
+++ b/drivers/usrsock/usrsock_dev.c
@@ -103,8 +103,8 @@ static const struct file_operations g_usrsockdevops =
   usrsockdev_write,   /* write */
   usrsockdev_seek,    /* seek */
   NULL,               /* ioctl */
-  NULL,               /* truncate */
   NULL,               /* mmap */
+  NULL,               /* truncate */
   usrsockdev_poll     /* poll */
 };
 
diff --git a/drivers/video/fb.c b/drivers/video/fb.c
index bea9c54d65ed5..9a0a764ca767e 100644
--- a/drivers/video/fb.c
+++ b/drivers/video/fb.c
@@ -88,8 +88,8 @@ static const struct file_operations fb_fops =
   fb_write,      /* write */
   fb_seek,       /* seek */
   fb_ioctl,      /* ioctl */
-  NULL,          /* truncate */
   fb_mmap,       /* mmap */
+  NULL,          /* truncate */
   fb_poll        /* poll */
 };
 
@@ -686,7 +686,8 @@ static int fb_mmap(FAR struct file *filep, FAR struct mm_map_entry_s *map)
 
   /* Return the address corresponding to the start of frame buffer. */
 
-  if (map->offset + map->length <= fb->fblen)
+  if (map->offset >= 0 && map->offset < fb->fblen &&
+      map->length && map->offset + map->length <= fb->fblen)
     {
       map->vaddr = (FAR char *)fb->fbmem + map->offset;
       ret = OK;
diff --git a/drivers/video/video.c b/drivers/video/video.c
index 2309909c89eb3..3c45408603eab 100644
--- a/drivers/video/video.c
+++ b/drivers/video/video.c
@@ -287,7 +287,6 @@ static const struct file_operations g_video_fops =
   video_write,              /* write */
   NULL,                     /* seek */
   video_ioctl,              /* ioctl */
-  NULL,                     /* truncate */
   video_mmap,               /* mmap */
 };
 
@@ -1583,6 +1582,12 @@ static size_t get_bufsize(FAR video_format_t *vf)
     }
 }
 
+static size_t get_heapsize(FAR video_type_inf_t *type_inf)
+{
+  return type_inf->bufinf.container_size *
+         get_bufsize(&type_inf->fmt[VIDEO_FMT_MAIN]);
+}
+
 static int video_try_fmt(FAR struct video_mng_s *priv,
                          FAR struct v4l2_format *v4l2)
 {
@@ -3196,13 +3201,16 @@ static int video_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
 
 static int video_mmap(FAR struct file *filep, FAR struct mm_map_entry_s *map)
 {
-  FAR struct inode *inode = filep->f_inode;
-  FAR video_mng_t  *priv  = (FAR video_mng_t *)inode->i_private;
-  int ret = -EINVAL;
+  FAR struct inode     *inode    = filep->f_inode;
+  FAR video_mng_t      *priv     = (FAR video_mng_t *)inode->i_private;
+  FAR video_type_inf_t *type_inf = &priv->video_inf;
+  size_t                heapsize = get_heapsize(type_inf);
+  int                   ret      = -EINVAL;
 
-  if (map)
+  if (map->offset >= 0 && map->offset < heapsize &&
+      map->length && map->offset + map->length <= heapsize)
     {
-      map->vaddr = priv->video_inf.bufheap + map->offset;
+      map->vaddr = type_inf->bufheap + map->offset;
       ret = OK;
     }
 
diff --git a/drivers/wireless/cc1101.c b/drivers/wireless/cc1101.c
index a3fcc638c4771..91d0e434b7b3e 100644
--- a/drivers/wireless/cc1101.c
+++ b/drivers/wireless/cc1101.c
@@ -305,8 +305,8 @@ static const struct file_operations g_cc1101ops =
   cc1101_file_write, /* write */
   NULL,              /* seek */
   NULL,              /* ioctl */
-  NULL,              /* truncate */
   NULL,              /* mmap */
+  NULL,              /* truncate */
   cc1101_file_poll   /* poll */
 };
 
diff --git a/drivers/wireless/gs2200m.c b/drivers/wireless/gs2200m.c
index 2d5f193dd43d5..10ca3b5988bfd 100644
--- a/drivers/wireless/gs2200m.c
+++ b/drivers/wireless/gs2200m.c
@@ -231,8 +231,8 @@ static const struct file_operations g_gs2200m_fops =
   gs2200m_write, /* write */
   NULL,          /* seek */
   gs2200m_ioctl, /* ioctl */
-  NULL,          /* truncate */
   NULL,          /* mmap */
+  NULL,          /* truncate */
   gs2200m_poll   /* poll */
 };
 
diff --git a/drivers/wireless/lpwan/sx127x/sx127x.c b/drivers/wireless/lpwan/sx127x/sx127x.c
index f6862cab20d86..35ee13b4a6c63 100644
--- a/drivers/wireless/lpwan/sx127x/sx127x.c
+++ b/drivers/wireless/lpwan/sx127x/sx127x.c
@@ -451,8 +451,8 @@ static const struct file_operations sx127x_fops =
   sx127x_write,   /* write */
   NULL,           /* seek */
   sx127x_ioctl,   /* ioctl */
-  NULL,           /* truncate */
   NULL,           /* mmap */
+  NULL,           /* truncate */
   sx127x_poll     /* poll */
 };
 
diff --git a/drivers/wireless/nrf24l01.c b/drivers/wireless/nrf24l01.c
index 3bf57677e931e..9eea16cc99b18 100644
--- a/drivers/wireless/nrf24l01.c
+++ b/drivers/wireless/nrf24l01.c
@@ -239,8 +239,8 @@ static const struct file_operations nrf24l01_fops =
   nrf24l01_write,   /* write */
   NULL,             /* seek */
   nrf24l01_ioctl,   /* ioctl */
-  NULL,             /* truncate */
   NULL,             /* mmap */
+  NULL,             /* truncate */
   nrf24l01_poll     /* poll */
 };
 
diff --git a/fs/binfs/fs_binfs.c b/fs/binfs/fs_binfs.c
index 758d8c31f7cf9..a03e81c7e1fdf 100644
--- a/fs/binfs/fs_binfs.c
+++ b/fs/binfs/fs_binfs.c
@@ -109,8 +109,8 @@ const struct mountpt_operations binfs_operations =
   NULL,              /* write */
   NULL,              /* seek */
   binfs_ioctl,       /* ioctl */
-  NULL,              /* truncate */
   NULL,              /* mmap */
+  NULL,              /* truncate */
 
   NULL,              /* sync */
   binfs_dup,         /* dup */
diff --git a/fs/cromfs/fs_cromfs.c b/fs/cromfs/fs_cromfs.c
index c80584871bf05..f1d03e3dfc56c 100644
--- a/fs/cromfs/fs_cromfs.c
+++ b/fs/cromfs/fs_cromfs.c
@@ -184,8 +184,8 @@ const struct mountpt_operations cromfs_operations =
   NULL,              /* write */
   NULL,              /* seek */
   cromfs_ioctl,      /* ioctl */
-  NULL,              /* truncate */
   NULL,              /* mmap */
+  NULL,              /* truncate */
 
   NULL,              /* sync */
   cromfs_dup,        /* dup */
diff --git a/fs/fat/fs_fat32.c b/fs/fat/fs_fat32.c
index 5086868e18276..f2ac86a9281a4 100644
--- a/fs/fat/fs_fat32.c
+++ b/fs/fat/fs_fat32.c
@@ -115,8 +115,8 @@ const struct mountpt_operations fat_operations =
   fat_write,         /* write */
   fat_seek,          /* seek */
   fat_ioctl,         /* ioctl */
-  fat_truncate,      /* truncate */
   NULL,              /* mmap */
+  fat_truncate,      /* truncate */
   fat_sync,          /* sync */
   fat_dup,           /* dup */
   fat_fstat,         /* fstat */
diff --git a/fs/hostfs/hostfs.c b/fs/hostfs/hostfs.c
index 1bb795fe545e0..dc9b53e1124f8 100644
--- a/fs/hostfs/hostfs.c
+++ b/fs/hostfs/hostfs.c
@@ -142,8 +142,8 @@ const struct mountpt_operations hostfs_operations =
   hostfs_write,         /* write */
   hostfs_seek,          /* seek */
   hostfs_ioctl,         /* ioctl */
-  hostfs_ftruncate,     /* ftruncate */
   NULL,                 /* mmap */
+  hostfs_ftruncate,     /* ftruncate */
 
   hostfs_sync,          /* sync */
   hostfs_dup,           /* dup */
diff --git a/fs/littlefs/lfs_vfs.c b/fs/littlefs/lfs_vfs.c
index 22b55e50484ed..fc42d68bc8ae3 100644
--- a/fs/littlefs/lfs_vfs.c
+++ b/fs/littlefs/lfs_vfs.c
@@ -140,8 +140,8 @@ const struct mountpt_operations littlefs_operations =
   littlefs_write,         /* write */
   littlefs_seek,          /* seek */
   littlefs_ioctl,         /* ioctl */
-  littlefs_truncate,      /* truncate */
   NULL,                   /* mmap */
+  littlefs_truncate,      /* truncate */
 
   littlefs_sync,          /* sync */
   littlefs_dup,           /* dup */
diff --git a/fs/mqueue/mq_open.c b/fs/mqueue/mq_open.c
index 204e45a7ee4ea..7fc6cf9915af0 100644
--- a/fs/mqueue/mq_open.c
+++ b/fs/mqueue/mq_open.c
@@ -60,8 +60,8 @@ static const struct file_operations g_nxmq_fileops =
   NULL,             /* write */
   NULL,             /* seek */
   NULL,             /* ioctl */
-  NULL,             /* truncate */
   NULL,             /* mmap */
+  NULL,             /* truncate */
   nxmq_file_poll    /* poll */
 };
 
diff --git a/fs/nfs/nfs_vfsops.c b/fs/nfs/nfs_vfsops.c
index 7eae707be206f..1358bc4f814cc 100644
--- a/fs/nfs/nfs_vfsops.c
+++ b/fs/nfs/nfs_vfsops.c
@@ -198,8 +198,8 @@ const struct mountpt_operations nfs_operations =
   nfs_write,                    /* write */
   NULL,                         /* seek */
   NULL,                         /* ioctl */
-  nfs_truncate,                 /* truncate */
   NULL,                         /* mmap */
+  nfs_truncate,                 /* truncate */
 
   NULL,                         /* sync */
   nfs_dup,                      /* dup */
diff --git a/fs/nxffs/nxffs_initialize.c b/fs/nxffs/nxffs_initialize.c
index 9b7e124a5448f..7e97e19b957e0 100644
--- a/fs/nxffs/nxffs_initialize.c
+++ b/fs/nxffs/nxffs_initialize.c
@@ -54,12 +54,12 @@ const struct mountpt_operations nxffs_operations =
   nxffs_write,       /* write */
   NULL,              /* seek -- Use f_pos in struct file */
   nxffs_ioctl,       /* ioctl */
+  NULL,              /* mmap */
 #ifdef __NO_TRUNCATE_SUPPORT__
   nxffs_truncate,    /* truncate */
 #else
   NULL,              /* truncate */
 #endif
-  NULL,              /* mmap */
 
   NULL,              /* sync -- No buffered data */
   nxffs_dup,         /* dup */
diff --git a/fs/procfs/fs_procfs.c b/fs/procfs/fs_procfs.c
index 7b446cc12eee3..bcecf480b58f9 100644
--- a/fs/procfs/fs_procfs.c
+++ b/fs/procfs/fs_procfs.c
@@ -252,8 +252,8 @@ const struct mountpt_operations procfs_operations =
   procfs_write,      /* write */
   NULL,              /* seek */
   procfs_ioctl,      /* ioctl */
-  NULL,              /* truncate */
   NULL,              /* mmap */
+  NULL,              /* truncate */
 
   NULL,              /* sync */
   procfs_dup,        /* dup */
diff --git a/fs/romfs/fs_romfs.c b/fs/romfs/fs_romfs.c
index 6d45fc48f6f0b..bafcdd25bd5c8 100644
--- a/fs/romfs/fs_romfs.c
+++ b/fs/romfs/fs_romfs.c
@@ -121,8 +121,8 @@ const struct mountpt_operations romfs_operations =
   NULL,            /* write */
   romfs_seek,      /* seek */
   romfs_ioctl,     /* ioctl */
-  NULL,            /* truncate */
   romfs_mmap,      /* mmap */
+  NULL,            /* truncate */
 
   NULL,            /* sync */
   romfs_dup,       /* dup */
@@ -580,7 +580,7 @@ static off_t romfs_seek(FAR struct file *filep, off_t offset, int whence)
 
 static int romfs_ioctl(FAR struct file *filep, int cmd, unsigned long arg)
 {
-  FAR struct romfs_file_s    *rf;
+  FAR struct romfs_file_s *rf;
 
   finfo("cmd: %d arg: %08lx\n", cmd, arg);
 
@@ -625,8 +625,8 @@ static int romfs_mmap(FAR struct file *filep, FAR struct mm_map_entry_s *map)
    * the file.
    */
 
-  if (map && rm && rm->rm_xipbase && rf &&
-      map->offset + map->length <= rf->rf_size)
+  if (rm->rm_xipbase && map->offset >= 0 && map->offset < rf->rf_size &&
+      map->length != 0 && map->offset + map->length <= rf->rf_size)
     {
       map->vaddr = rm->rm_xipbase + rf->rf_startoffset + map->offset;
       ret = OK;
diff --git a/fs/rpmsgfs/rpmsgfs.c b/fs/rpmsgfs/rpmsgfs.c
index b56f5662bd61c..63cfc2900399c 100644
--- a/fs/rpmsgfs/rpmsgfs.c
+++ b/fs/rpmsgfs/rpmsgfs.c
@@ -109,7 +109,7 @@ static int     rpmsgfs_fstat(FAR const struct file *filep,
                              FAR struct stat *buf);
 static int     rpmsgfs_fchstat(FAR const struct file *filep,
                                FAR const struct stat *buf, int flags);
-static int     rpmsgfs_ftruncate(FAR struct file *filep,
+static int     rpmsgfs_truncate(FAR struct file *filep,
                                  off_t length);
 
 static int     rpmsgfs_opendir(FAR struct inode *mountpt,
@@ -161,8 +161,8 @@ const struct mountpt_operations rpmsgfs_operations =
   rpmsgfs_write,         /* write */
   rpmsgfs_seek,          /* seek */
   rpmsgfs_ioctl,         /* ioctl */
-  rpmsgfs_ftruncate,     /* ftruncate */
   NULL,                  /* mmap */
+  rpmsgfs_truncate,      /* truncate */
 
   rpmsgfs_sync,          /* sync */
   rpmsgfs_dup,           /* dup */
@@ -804,7 +804,7 @@ static int rpmsgfs_fchstat(FAR const struct file *filep,
 }
 
 /****************************************************************************
- * Name: rpmsgfs_ftruncate
+ * Name: rpmsgfs_truncate
  *
  * Description:
  *   Set the length of the open, regular file associated with the file
@@ -812,7 +812,7 @@ static int rpmsgfs_fchstat(FAR const struct file *filep,
  *
  ****************************************************************************/
 
-static int rpmsgfs_ftruncate(FAR struct file *filep, off_t length)
+static int rpmsgfs_truncate(FAR struct file *filep, off_t length)
 {
   FAR struct inode *inode;
   FAR struct rpmsgfs_mountpt_s *fs;
diff --git a/fs/smartfs/smartfs_smart.c b/fs/smartfs/smartfs_smart.c
index 93486cedf7fae..d7928edd1ae67 100644
--- a/fs/smartfs/smartfs_smart.c
+++ b/fs/smartfs/smartfs_smart.c
@@ -140,8 +140,8 @@ const struct mountpt_operations smartfs_operations =
   smartfs_write,         /* write */
   smartfs_seek,          /* seek */
   smartfs_ioctl,         /* ioctl */
-  smartfs_truncate,      /* truncate */
   NULL,                  /* mmap */
+  smartfs_truncate,      /* truncate */
 
   smartfs_sync,          /* sync */
   smartfs_dup,           /* dup */
diff --git a/fs/socket/socket.c b/fs/socket/socket.c
index aff1dcf4bd462..6555f4255d177 100644
--- a/fs/socket/socket.c
+++ b/fs/socket/socket.c
@@ -64,8 +64,8 @@ static const struct file_operations g_sock_fileops =
   sock_file_write,  /* write */
   NULL,             /* seek */
   sock_file_ioctl,  /* ioctl */
-  NULL,             /* truncate */
   NULL,             /* mmap */
+  NULL,             /* truncate */
   sock_file_poll    /* poll */
 };
 
diff --git a/fs/spiffs/src/spiffs_vfs.c b/fs/spiffs/src/spiffs_vfs.c
index b3c9b77fbd4b9..163c427054d99 100644
--- a/fs/spiffs/src/spiffs_vfs.c
+++ b/fs/spiffs/src/spiffs_vfs.c
@@ -141,8 +141,8 @@ const struct mountpt_operations spiffs_operations =
   spiffs_write,      /* write */
   spiffs_seek,       /* seek */
   spiffs_ioctl,      /* ioctl */
-  spiffs_truncate,   /* truncate */
   NULL,              /* mmap */
+  spiffs_truncate,   /* truncate */
 
   spiffs_sync,       /* sync */
   spiffs_dup,        /* dup */
diff --git a/fs/tmpfs/fs_tmpfs.c b/fs/tmpfs/fs_tmpfs.c
index 7db062e62a900..56dbd39fa59e6 100644
--- a/fs/tmpfs/fs_tmpfs.c
+++ b/fs/tmpfs/fs_tmpfs.c
@@ -178,8 +178,8 @@ const struct mountpt_operations tmpfs_operations =
   tmpfs_write,      /* write */
   tmpfs_seek,       /* seek */
   NULL,             /* ioctl */
-  tmpfs_truncate,   /* truncate */
   tmpfs_mmap,       /* mmap */
+  tmpfs_truncate,   /* truncate */
 
   tmpfs_sync,       /* sync */
   tmpfs_dup,        /* dup */
@@ -1655,7 +1655,8 @@ static int tmpfs_mmap(FAR struct file *filep, FAR struct mm_map_entry_s *map)
 
   DEBUGASSERT(tfo != NULL);
 
-  if (map && map->offset + map->length <= tfo->tfo_size)
+  if (map->offset >= 0 && map->offset < tfo->tfo_size &&
+      map->length && map->offset + map->length <= tfo->tfo_size)
     {
       map->vaddr = tfo->tfo_data + map->offset;
       ret = OK;
diff --git a/fs/unionfs/fs_unionfs.c b/fs/unionfs/fs_unionfs.c
index 6aa10c83f22bd..bf0c642cff9f0 100644
--- a/fs/unionfs/fs_unionfs.c
+++ b/fs/unionfs/fs_unionfs.c
@@ -222,8 +222,8 @@ const struct mountpt_operations unionfs_operations =
   unionfs_write,       /* write */
   unionfs_seek,        /* seek */
   unionfs_ioctl,       /* ioctl */
-  unionfs_truncate,    /* truncate */
   NULL,                /* mmap */
+  unionfs_truncate,    /* truncate */
 
   unionfs_sync,        /* sync */
   unionfs_dup,         /* dup */
diff --git a/fs/userfs/fs_userfs.c b/fs/userfs/fs_userfs.c
index fad5276b98908..953b3c6caba30 100644
--- a/fs/userfs/fs_userfs.c
+++ b/fs/userfs/fs_userfs.c
@@ -160,8 +160,8 @@ const struct mountpt_operations userfs_operations =
   userfs_write,      /* write */
   userfs_seek,       /* seek */
   userfs_ioctl,      /* ioctl */
-  userfs_truncate,   /* truncate */
   NULL,              /* mmap */
+  userfs_truncate,   /* truncate */
 
   userfs_sync,       /* sync */
   userfs_dup,        /* dup */
diff --git a/fs/vfs/fs_epoll.c b/fs/vfs/fs_epoll.c
index 964d90e1b14ea..a75c793022f82 100644
--- a/fs/vfs/fs_epoll.c
+++ b/fs/vfs/fs_epoll.c
@@ -104,8 +104,8 @@ static const struct file_operations g_epoll_ops =
   NULL,             /* write */
   NULL,             /* seek */
   NULL,             /* ioctl */
-  NULL,             /* truncate */
   NULL,             /* mmap */
+  NULL,             /* truncate */
   epoll_do_poll     /* poll */
 };
 
diff --git a/fs/vfs/fs_eventfd.c b/fs/vfs/fs_eventfd.c
index 50ccd4e2af607..ac3287b47499e 100644
--- a/fs/vfs/fs_eventfd.c
+++ b/fs/vfs/fs_eventfd.c
@@ -100,8 +100,8 @@ static const struct file_operations g_eventfd_fops =
   eventfd_do_write, /* write */
   NULL,             /* seek */
   NULL,             /* ioctl */
-  NULL,             /* truncate */
   NULL,             /* mmap */
+  NULL,             /* truncate */
 #ifdef CONFIG_EVENT_FD_POLL
   eventfd_do_poll   /* poll */
 #endif
diff --git a/fs/vfs/fs_signalfd.c b/fs/vfs/fs_signalfd.c
index bd5ddd3cd5811..62e4963468a7d 100644
--- a/fs/vfs/fs_signalfd.c
+++ b/fs/vfs/fs_signalfd.c
@@ -79,8 +79,8 @@ static const struct file_operations g_signalfd_fileops =
   NULL,                 /* write */
   NULL,                 /* seek */
   NULL,                 /* ioctl */
-  NULL,                 /* truncate */
   NULL,                 /* mmap */
+  NULL,                 /* truncate */
   signalfd_file_poll    /* poll */
 };
 
diff --git a/graphics/nxterm/nxterm_driver.c b/graphics/nxterm/nxterm_driver.c
index 7fd79f7bc28d4..4367c6d61c354 100644
--- a/graphics/nxterm/nxterm_driver.c
+++ b/graphics/nxterm/nxterm_driver.c
@@ -66,8 +66,8 @@ const struct file_operations g_nxterm_drvrops =
   nxterm_write,   /* write */
   NULL,           /* seek */
   nxterm_ioctl,   /* ioctl */
-  NULL,           /* truncate */
   NULL,           /* mmap */
+  NULL,           /* truncate */
   nxterm_poll     /* poll */
 #ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
   , nxterm_unlink /* unlink */
@@ -84,8 +84,8 @@ const struct file_operations g_nxterm_drvrops =
   nxterm_write,   /* write */
   NULL,           /* seek */
   nxterm_ioctl,   /* ioctl */
-  NULL,           /* truncate */
   NULL,           /* mmap */
+  NULL,           /* truncate */
   NULL            /* poll */
 #ifndef CONFIG_DISABLE_PSEUDOFS_OPERATIONS
   , nxterm_unlink /* unlink */
diff --git a/include/nuttx/fs/fs.h b/include/nuttx/fs/fs.h
index 21e31adf03e24..6032252b16184 100644
--- a/include/nuttx/fs/fs.h
+++ b/include/nuttx/fs/fs.h
@@ -213,8 +213,8 @@ struct file_operations
                    size_t buflen);
   off_t   (*seek)(FAR struct file *filep, off_t offset, int whence);
   int     (*ioctl)(FAR struct file *filep, int cmd, unsigned long arg);
-  int     (*truncate)(FAR struct file *filep, off_t length);
   int     (*mmap)(FAR struct file *filep, FAR struct mm_map_entry_s *map);
+  int     (*truncate)(FAR struct file *filep, off_t length);
 
   /* The two structures need not be common after this point */
 
@@ -301,8 +301,8 @@ struct mountpt_operations
             size_t buflen);
   off_t   (*seek)(FAR struct file *filep, off_t offset, int whence);
   int     (*ioctl)(FAR struct file *filep, int cmd, unsigned long arg);
-  int     (*truncate)(FAR struct file *filep, off_t length);
   int     (*mmap)(FAR struct file *filep, FAR struct mm_map_entry_s *map);
+  int     (*truncate)(FAR struct file *filep, off_t length);
 
   /* The two structures need not be common after this point. The following
    * are extended methods needed to deal with the unique needs of mounted