diff --git a/ee/iopreboot/src/imgdrv/src/imgdrv.c b/ee/iopreboot/src/imgdrv/src/imgdrv.c
index 684a4ffb049..f72c3af30cf 100644
--- a/ee/iopreboot/src/imgdrv/src/imgdrv.c
+++ b/ee/iopreboot/src/imgdrv/src/imgdrv.c
@@ -22,7 +22,6 @@
 IRX_ID(MODNAME, 1, 1);
 
 // Function prototypes
-static int imgdrv_dummy(void);
 static int imgdrv_read(iop_file_t *f, void *buf, int size);
 static int imgdrv_lseek(iop_file_t *f, int offset, int whence);
 
@@ -41,14 +40,14 @@ typedef struct _iop_device_ops_short
 } iop_device_ops_short_t;
 
 static iop_device_ops_short_t imgdrv_ops = {
-    (void *)&imgdrv_dummy, // init
-    (void *)&imgdrv_dummy, // deinit
-    NULL,                  // format
-    (void *)&imgdrv_dummy, // open
-    (void *)&imgdrv_dummy, // close
-    &imgdrv_read,          // read
-    NULL,                  // write
-    &imgdrv_lseek,         // lseek
+    DUMMY_IMPLEMENTATION, // init
+    DUMMY_IMPLEMENTATION, // deinit
+    NOT_SUPPORTED, // format
+    NOT_SUPPORTED, // open
+    NOT_SUPPORTED, // close
+    &imgdrv_read, // read
+    NOT_SUPPORTED, // write
+    &imgdrv_lseek, // lseek
 };
 
 #define MAX_IMAGES 2
@@ -69,11 +68,6 @@ int _start(int argc, char *argv[])
     return (AddDrv(&img_device) < 0) ? MODULE_NO_RESIDENT_END : MODULE_RESIDENT_END;
 }
 
-static int imgdrv_dummy(void)
-{
-    return 0;
-}
-
 static int imgdrv_read(iop_file_t *f, void *buf, int size)
 {
     int i;
diff --git a/iop/arcade/accdvd/src/cddrv.c b/iop/arcade/accdvd/src/cddrv.c
index e6dcea82424..88e849585b7 100644
--- a/iop/arcade/accdvd/src/cddrv.c
+++ b/iop/arcade/accdvd/src/cddrv.c
@@ -21,23 +21,23 @@ static int cddrv_ioctl(iop_file_t *io, int cmd, void *arg);
 
  
 static iop_device_ops_t Cddrv_ops = {
-	&cddrv_adddrv,
-	&cddrv_deldrv,
-	NOT_SUPPORTED,
-	&cddrv_open,
-	&cddrv_close,
-	&cddrv_read,
-	&cddrv_write,
-	&cddrv_lseek,
-	&cddrv_ioctl,
-	NOT_SUPPORTED,
-	NOT_SUPPORTED,
-	NOT_SUPPORTED,
-	NOT_SUPPORTED,
-	NOT_SUPPORTED,
-	NOT_SUPPORTED,
-	NOT_SUPPORTED,
-	NOT_SUPPORTED
+	&cddrv_adddrv, // init
+	&cddrv_deldrv, // deinit
+	NOT_SUPPORTED, // format
+	&cddrv_open, // open
+	&cddrv_close, // close
+	&cddrv_read, // read
+	&cddrv_write, // write
+	&cddrv_lseek, // lseek
+	&cddrv_ioctl, // ioctl
+	NOT_SUPPORTED, // remove
+	NOT_SUPPORTED, // mkdir
+	NOT_SUPPORTED, // rmdir
+	NOT_SUPPORTED, // dopen
+	NOT_SUPPORTED, // dclose
+	NOT_SUPPORTED, // dread
+	NOT_SUPPORTED, // getstat
+	NOT_SUPPORTED, // chstat
 };
 
 static iop_device_t Cddrv = {"cdrom", 16u, 0u, "ATAPI_C/DVD-ROM", &Cddrv_ops};
diff --git a/iop/arcade/acuart/src/tty.c b/iop/arcade/acuart/src/tty.c
index caa0de2df77..26aceb52150 100644
--- a/iop/arcade/acuart/src/tty.c
+++ b/iop/arcade/acuart/src/tty.c
@@ -5,8 +5,6 @@
 int acUartWrite(void *buf, int count);
 int acUartRead(void *buf, int count);
 
-int dummy() {return -ENOTSUP;}
-
 static int acuart_read(iop_file_t *f, void *buffer, int size) {
     (void)f;
     return acUartRead(buffer, size);
@@ -17,23 +15,23 @@ static int acuart_write(iop_file_t *f, void *buffer, int size) {
 }
 
 static iop_device_ops_t uart_ops = {
-    (void *)&dummy,
-    (void *)&dummy,
-    (void *)&dummy,
-    (void *)&dummy,
-    (void *)&dummy,
-    &acuart_read,
-    &acuart_write,
-    (void *)&dummy,
-    (void *)&dummy,
-    (void *)&dummy,
-    (void *)&dummy,
-    (void *)&dummy,
-    (void *)&dummy,
-    (void *)&dummy,
-    (void *)&dummy,
-    (void *)&dummy,
-    (void *)&dummy,
+    DUMMY_IMPLEMENTATION, // init
+    DUMMY_IMPLEMENTATION, // deinit
+    NOT_SUPPORTED, // format
+    NOT_SUPPORTED, // open
+    NOT_SUPPORTED, // close
+    &acuart_read, // read
+    &acuart_write, // write
+    NOT_SUPPORTED, // lseek
+    NOT_SUPPORTED, // ioctl
+    NOT_SUPPORTED, // remove
+    NOT_SUPPORTED, // mkdir
+    NOT_SUPPORTED, // rmdir
+    NOT_SUPPORTED, // dopen
+    NOT_SUPPORTED, // dclose
+    NOT_SUPPORTED, // dread
+    NOT_SUPPORTED, // getstat
+    NOT_SUPPORTED, // chstat
 };
 
 #define DEVNAME "tty"
diff --git a/iop/cdvd/cdfs/src/main.c b/iop/cdvd/cdfs/src/main.c
index 3c436709a95..1483d100997 100755
--- a/iop/cdvd/cdfs/src/main.c
+++ b/iop/cdvd/cdfs/src/main.c
@@ -419,23 +419,23 @@ static int fio_getstat(iop_file_t *fd, const char *name, io_stat_t *stat)
 }
 
 static iop_device_ops_t fio_ops = {
-    &fio_init,
-    &fio_deinit,
-    NOT_SUPPORTED,
-    &fio_open,
-    &fio_close,
-    &fio_read,
-    &fio_write,
-    &fio_lseek,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    &fio_openDir,
-    &fio_closeDir,
-    &fio_dread,
-    &fio_getstat,
-    NOT_SUPPORTED,
+    &fio_init, // init
+    &fio_deinit, // deinit
+    NOT_SUPPORTED, // format
+    &fio_open, // open
+    &fio_close, // close
+    &fio_read, // read
+    &fio_write, // write
+    &fio_lseek, // lseek
+    NOT_SUPPORTED, // ioctl
+    NOT_SUPPORTED, // remove
+    NOT_SUPPORTED, // mkdir
+    NOT_SUPPORTED, // rmdir
+    &fio_openDir, // dopen
+    &fio_closeDir, // dclose
+    &fio_dread, // dread
+    &fio_getstat, // getstat
+    NOT_SUPPORTED, // chstat
 };
 
 static iop_device_t fio_driver = {
diff --git a/iop/cdvd/xesdrv/src/xesdrv.c b/iop/cdvd/xesdrv/src/xesdrv.c
index 52595019d7a..3e771c1702d 100644
--- a/iop/cdvd/xesdrv/src/xesdrv.c
+++ b/iop/cdvd/xesdrv/src/xesdrv.c
@@ -28,7 +28,6 @@ static int esdrv_df_devctl(
 	iomanX_iop_file_t *f, const char *name, int cmd, void *arg, unsigned int arglen, void *buf, unsigned int buflen);
 static int
 esdrv_df_ioctl2(iomanX_iop_file_t *f, int cmd, void *arg, unsigned int arglen, void *buf, unsigned int buflen);
-static s64 esdrv_df_null_long();
 static int
 esioctl2_func_1(iomanX_iop_file_t *f, int cmd, void *arg, unsigned int arglen, void *buf, unsigned int buflen);
 static int
@@ -220,33 +219,33 @@ struct DevctlCmdTbl_t
 };
 
 static iomanX_iop_device_ops_t DvrFuncTbl = {
-	&esdrv_df_init,
-	&esdrv_df_exit,
-	NOT_SUPPORTED,
-	NOT_SUPPORTED,
-	NOT_SUPPORTED,
-	NOT_SUPPORTED,
-	NOT_SUPPORTED,
-	NOT_SUPPORTED,
-	&esdrv_df_ioctl,
-	NOT_SUPPORTED,
-	NOT_SUPPORTED,
-	NOT_SUPPORTED,
-	NOT_SUPPORTED,
-	NOT_SUPPORTED,
-	NOT_SUPPORTED,
-	NOT_SUPPORTED,
-	NOT_SUPPORTED,
-	NOT_SUPPORTED,
-	NOT_SUPPORTED,
-	NOT_SUPPORTED,
-	NOT_SUPPORTED,
-	NOT_SUPPORTED,
-	(void *)&esdrv_df_null_long,
-	&esdrv_df_devctl,
-	NOT_SUPPORTED,
-	NOT_SUPPORTED,
-	&esdrv_df_ioctl2,
+	&esdrv_df_init, // init
+	&esdrv_df_exit, // deinit
+	NOT_SUPPORTED, // format
+	NOT_SUPPORTED, // open
+	NOT_SUPPORTED, // close
+	NOT_SUPPORTED, // read
+	NOT_SUPPORTED, // write
+	NOT_SUPPORTED, // lseek
+	&esdrv_df_ioctl, // ioctl
+	NOT_SUPPORTED, // remove
+	NOT_SUPPORTED, // mkdir
+	NOT_SUPPORTED, // rmdir
+	NOT_SUPPORTED, // dopen
+	NOT_SUPPORTED, // dclose
+	NOT_SUPPORTED, // dread
+	NOT_SUPPORTED, // getstat
+	NOT_SUPPORTED, // chstat
+	NOT_SUPPORTED, // rename
+	NOT_SUPPORTED, // chdir
+	NOT_SUPPORTED, // sync
+	NOT_SUPPORTED, // mount
+	NOT_SUPPORTED, // umount
+	NOT_SUPPORTED_S64, // lseek64
+	&esdrv_df_devctl, // devctl
+	NOT_SUPPORTED, // symlink
+	NOT_SUPPORTED, // readlink
+	&esdrv_df_ioctl2, // ioctl2
 };
 static iomanX_iop_device_t ESDRV = {
 	.name = "es_drv",
@@ -371,11 +370,6 @@ esdrv_df_ioctl2(iomanX_iop_file_t *f, int cmd, void *arg, unsigned int arglen, v
 	return -EINVAL;
 }
 
-static s64 esdrv_df_null_long()
-{
-	return -EUNSUP;
-}
-
 static void EsAcsSetAaryptorIoMode(void)
 {
 	es_regs->r_es0C = 0;
diff --git a/iop/debug/iop_sbusdbg/src/sbus_tty.c b/iop/debug/iop_sbusdbg/src/sbus_tty.c
index df013939029..0544cecb815 100644
--- a/iop/debug/iop_sbusdbg/src/sbus_tty.c
+++ b/iop/debug/iop_sbusdbg/src/sbus_tty.c
@@ -94,23 +94,23 @@ static int ttyfs_write(iop_file_t *file, void *ptr, int size) {
 
 static iop_device_ops_t fsd_ops =
 {
-    &ttyfs_init,
-    &ttyfs_deinit,
-    NOT_SUPPORTED,
-    &ttyfs_open,
-    &ttyfs_close,
-	NOT_SUPPORTED,
-    &ttyfs_write,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-	&ttyfs_dopen,
-    &ttyfs_close,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
+    &ttyfs_init, // init
+    &ttyfs_deinit, // deinit
+    NOT_SUPPORTED, // format
+    &ttyfs_open, // open
+    &ttyfs_close, // close
+	NOT_SUPPORTED, // read
+    &ttyfs_write, // write
+    NOT_SUPPORTED, // lseek
+    NOT_SUPPORTED, // ioctl
+    NOT_SUPPORTED, // remove
+    NOT_SUPPORTED, // mkdir
+    NOT_SUPPORTED, // rmdir
+	&ttyfs_dopen, // dopen
+    &ttyfs_close, // dclose
+    NOT_SUPPORTED, // dread
+    NOT_SUPPORTED, // getstat
+    NOT_SUPPORTED, // chstat
 };
 
 static iop_device_t tty_fsd =
diff --git a/iop/debug/ppctty/src/tty.c b/iop/debug/ppctty/src/tty.c
index eeab37bc915..b68ac0a1b57 100644
--- a/iop/debug/ppctty/src/tty.c
+++ b/iop/debug/ppctty/src/tty.c
@@ -44,33 +44,6 @@ static int ttyfs_deinit()
 	return 0;
 }
 
-static int ttyfs_open(iop_file_t *file, const char *name, int flags)
-{
-    (void)file;
-    (void)name;
-    (void)flags;
-
-    DPRINTF("FS Open()\n");
-	return 0;
-}
-
-static int ttyfs_dopen(iop_file_t *file, const char *name)
-{
-    (void)file;
-    (void)name;
-
-    DPRINTF("FS Dopen()\n");
-    return 0;
-}
-
-static int ttyfs_close(iop_file_t *file)
-{
-    (void)file;
-
-    DPRINTF("FS Close()\n");
-    return(0);
-}
-
 static int ttyfs_write(iop_file_t *file, void *ptr, int size) {
     char temp[65];
     int bCount = 0;
@@ -101,23 +74,23 @@ static int ttyfs_write(iop_file_t *file, void *ptr, int size) {
 
 static iop_device_ops_t fsd_ops =
 {
-    &ttyfs_init,
-    &ttyfs_deinit,
-    NOT_SUPPORTED,
-    &ttyfs_open,
-    &ttyfs_close,
-	NOT_SUPPORTED,
-    &ttyfs_write,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-	&ttyfs_dopen,
-    &ttyfs_close,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
+    &ttyfs_init, // init
+    &ttyfs_deinit, // deinit
+    NOT_SUPPORTED, // format
+    NOT_SUPPORTED, // open
+    NOT_SUPPORTED, // close
+	NOT_SUPPORTED, // read
+    &ttyfs_write, // write
+    NOT_SUPPORTED, // lseek
+    NOT_SUPPORTED, // ioctl
+    NOT_SUPPORTED, // remove
+    NOT_SUPPORTED, // mkdir
+    NOT_SUPPORTED, // rmdir
+	NOT_SUPPORTED, // dopen
+    NOT_SUPPORTED, // dclose
+    NOT_SUPPORTED, // dread
+    NOT_SUPPORTED, // getstat
+    NOT_SUPPORTED, // chstat
 };
 
 static iop_device_t tty_fsd =
diff --git a/iop/dev9/dev9/src/ps2dev9.c b/iop/dev9/dev9/src/ps2dev9.c
index 816e752c14e..bcd6177ce39 100644
--- a/iop/dev9/dev9/src/ps2dev9.c
+++ b/iop/dev9/dev9/src/ps2dev9.c
@@ -122,11 +122,6 @@ static int expbay_init(int sema_attr);
 
 extern struct irx_export_table _exp_dev9;
 
-static int dev9x_dummy(void)
-{
-    return 0;
-}
-
 static int dev9x_devctl(iop_file_t *f, const char *name, int cmd, void *args, unsigned int arglen, void *buf, unsigned int buflen)
 {
     (void)f;
@@ -153,33 +148,33 @@ static int dev9x_devctl(iop_file_t *f, const char *name, int cmd, void *args, un
 
 static iop_device_ops_t dev9x_ops =
     {
-        (void *)&dev9x_dummy,
-        (void *)&dev9x_dummy,
-        (void *)&dev9x_dummy,
-        (void *)&dev9x_dummy,
-        (void *)&dev9x_dummy,
-        (void *)&dev9x_dummy,
-        (void *)&dev9x_dummy,
-        (void *)&dev9x_dummy,
-        (void *)&dev9x_dummy,
-        (void *)&dev9x_dummy,
-        (void *)&dev9x_dummy,
-        (void *)&dev9x_dummy,
-        (void *)&dev9x_dummy,
-        (void *)&dev9x_dummy,
-        (void *)&dev9x_dummy,
-        (void *)&dev9x_dummy,
-        (void *)&dev9x_dummy,
-        (void *)&dev9x_dummy,
-        (void *)&dev9x_dummy,
-        (void *)&dev9x_dummy,
-        (void *)&dev9x_dummy,
-        (void *)&dev9x_dummy,
-        (void *)&dev9x_dummy,
-        &dev9x_devctl,
-        (void *)&dev9x_dummy,
-        (void *)&dev9x_dummy,
-        (void *)&dev9x_dummy,
+        DUMMY_IMPLEMENTATION, // init
+        DUMMY_IMPLEMENTATION, // deinit
+        NOT_SUPPORTED, // format
+        NOT_SUPPORTED, // open
+        NOT_SUPPORTED, // close
+        NOT_SUPPORTED, // read
+        NOT_SUPPORTED, // write
+        NOT_SUPPORTED, // lseek
+        NOT_SUPPORTED, // ioctl
+        NOT_SUPPORTED, // remove
+        NOT_SUPPORTED, // mkdir
+        NOT_SUPPORTED, // rmdir
+        NOT_SUPPORTED, // dopen
+        NOT_SUPPORTED, // dclose
+        NOT_SUPPORTED, // dread
+        NOT_SUPPORTED, // getstat
+        NOT_SUPPORTED, // chstat
+        NOT_SUPPORTED, // rename
+        NOT_SUPPORTED, // chdir
+        NOT_SUPPORTED, // sync
+        NOT_SUPPORTED, // mount
+        NOT_SUPPORTED, // umount
+        NOT_SUPPORTED_S64, // lseek64
+        &dev9x_devctl, // devctl
+        NOT_SUPPORTED, // symlink
+        NOT_SUPPORTED, // readlink
+        NOT_SUPPORTED, // ioctl2
 };
 
 static iop_device_t dev9x_device =
diff --git a/iop/dvrp/dvr/src/dvr.c b/iop/dvrp/dvr/src/dvr.c
index 0885b361442..5278a8167b9 100644
--- a/iop/dvrp/dvr/src/dvr.c
+++ b/iop/dvrp/dvr/src/dvr.c
@@ -33,7 +33,6 @@ extern int dvr_df_exit(iomanX_iop_device_t *dev);
 extern int dvr_df_ioctl(iomanX_iop_file_t *f, int cmd, void *param);
 extern int dvr_df_devctl(iomanX_iop_file_t *a1, const char *name, int cmd, void *arg, unsigned int arglen, void *buf, unsigned int buflen);
 extern int dvr_df_ioctl2(iomanX_iop_file_t *f, int cmd, void *arg, unsigned int arglen, void *buf, unsigned int buflen);
-extern s64 dvr_df_null_long();
 extern int dvrioctl2_rec_start(iomanX_iop_file_t *a1, const char *name, int cmd, void *arg, unsigned int arglen, void *buf, unsigned int buflen);
 extern int dvrioctl2_rec_pause(iomanX_iop_file_t *a1, const char *name, int cmd, void *arg, unsigned int arglen, void *buf, unsigned int buflen);
 extern int dvrioctl2_rec_stop(iomanX_iop_file_t *a1, const char *name, int cmd, void *arg, unsigned int arglen, void *buf, unsigned int buflen);
@@ -111,33 +110,33 @@ struct DevctlCmdTbl_t
 
 static iomanX_iop_device_ops_t DvrFuncTbl =
     {
-        &dvr_df_init,
-        &dvr_df_exit,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        &dvr_df_ioctl,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        (void *)&dvr_df_null_long,
-        &dvr_df_devctl,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        &dvr_df_ioctl2,
+        &dvr_df_init, // init
+        &dvr_df_exit, // deinit
+        NOT_SUPPORTED, // format
+        NOT_SUPPORTED, // open
+        NOT_SUPPORTED, // close
+        NOT_SUPPORTED, // read
+        NOT_SUPPORTED, // write
+        NOT_SUPPORTED, // lseek
+        &dvr_df_ioctl, // ioctl
+        NOT_SUPPORTED, // remove
+        NOT_SUPPORTED, // mkdir
+        NOT_SUPPORTED, // rmdir
+        NOT_SUPPORTED, // dopen
+        NOT_SUPPORTED, // dclose
+        NOT_SUPPORTED, // dread
+        NOT_SUPPORTED, // getstat
+        NOT_SUPPORTED, // chstat
+        NOT_SUPPORTED, // rename
+        NOT_SUPPORTED, // chdir
+        NOT_SUPPORTED, // sync
+        NOT_SUPPORTED, // mount
+        NOT_SUPPORTED, // umount
+        NOT_SUPPORTED_S64, // lseek64
+        &dvr_df_devctl, // devctl
+        NOT_SUPPORTED, // symlink
+        NOT_SUPPORTED, // readlink
+        &dvr_df_ioctl2, // ioctl2
     };
 char TEVENT_BUF[6144];
 char *tevent_p;
@@ -285,11 +284,6 @@ int dvr_df_ioctl2(iomanX_iop_file_t *f, int cmd, void *arg, unsigned int arglen,
     return -EINVAL;
 }
 
-s64 dvr_df_null_long()
-{
-    return -134LL;
-}
-
 int dvrioctl2_rec_start(
     iomanX_iop_file_t *a1,
     const char *name,
diff --git a/iop/dvrp/dvrav/src/dvrav.c b/iop/dvrp/dvrav/src/dvrav.c
index e0eb7b58ffe..975db219acb 100644
--- a/iop/dvrp/dvrav/src/dvrav.c
+++ b/iop/dvrp/dvrav/src/dvrav.c
@@ -32,7 +32,6 @@ extern int dvrav_df_exit(iomanX_iop_device_t *dev);
 extern int dvrav_df_ioctl(iomanX_iop_file_t *f, int cmd, void *param);
 extern int dvrav_df_devctl(iomanX_iop_file_t *a1, const char *name, int cmd, void *arg, unsigned int arglen, void *buf, unsigned int buflen);
 extern int dvrav_df_ioctl2(iomanX_iop_file_t *f, int cmd, void *arg, unsigned int arglen, void *buf, unsigned int buflen);
-extern s64 dvrav_df_null_long();
 extern int avioctl2_select_position(iomanX_iop_file_t *a1, int cmd, void *arg, unsigned int arglen, void *buf, unsigned int buflen);
 extern int avioctl2_get_position(iomanX_iop_file_t *a1, int cmd, void *arg, unsigned int arglen, void *buf, unsigned int buflen);
 extern int avioctl2_position_up(iomanX_iop_file_t *a1, int cmd, void *arg, unsigned int arglen, void *buf, unsigned int buflen);
@@ -110,33 +109,33 @@ struct DevctlCmdTbl_t
 
 static iomanX_iop_device_ops_t DvrFuncTbl =
     {
-        &dvrav_df_init,
-        &dvrav_df_exit,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        &dvrav_df_ioctl,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        (void *)&dvrav_df_null_long,
-        &dvrav_df_devctl,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        &dvrav_df_ioctl2,
+        &dvrav_df_init, // init
+        &dvrav_df_exit, // deinit
+        NOT_SUPPORTED, // format
+        NOT_SUPPORTED, // open
+        NOT_SUPPORTED, // close
+        NOT_SUPPORTED, // read
+        NOT_SUPPORTED, // write
+        NOT_SUPPORTED, // lseek
+        &dvrav_df_ioctl, // ioctl
+        NOT_SUPPORTED, // remove
+        NOT_SUPPORTED, // mkdir
+        NOT_SUPPORTED, // rmdir
+        NOT_SUPPORTED, // dopen
+        NOT_SUPPORTED, // dclose
+        NOT_SUPPORTED, // dread
+        NOT_SUPPORTED, // getstat
+        NOT_SUPPORTED, // chstat
+        NOT_SUPPORTED, // rename
+        NOT_SUPPORTED, // chdir
+        NOT_SUPPORTED, // sync
+        NOT_SUPPORTED, // mount
+        NOT_SUPPORTED, // umount
+        NOT_SUPPORTED_S64, // lseek64
+        &dvrav_df_devctl, // devctl
+        NOT_SUPPORTED, // symlink
+        NOT_SUPPORTED, // readlink
+        &dvrav_df_ioctl2, // ioctl2
     };
 static iomanX_iop_device_t DVRAV = {
     .name = "dvr_av",
@@ -283,11 +282,6 @@ int dvrav_df_ioctl2(iomanX_iop_file_t *f, int cmd, void *arg, unsigned int argle
     return -EINVAL;
 }
 
-s64 dvrav_df_null_long()
-{
-    return -134LL;
-}
-
 int avioctl2_get_tun_offset(
     iomanX_iop_file_t *a1,
     int cmd,
diff --git a/iop/dvrp/dvrdv/src/dvrdv.c b/iop/dvrp/dvrdv/src/dvrdv.c
index 8e179d8ea4a..0ee6b5d63c4 100644
--- a/iop/dvrp/dvrdv/src/dvrdv.c
+++ b/iop/dvrp/dvrdv/src/dvrdv.c
@@ -32,7 +32,6 @@ extern int dvrdv_df_exit(iomanX_iop_device_t *dev);
 extern int dvrdv_df_ioctl(iomanX_iop_file_t *f, int cmd, void *param);
 extern int dvrdv_df_devctl(iomanX_iop_file_t *a1, const char *name, int cmd, void *arg, unsigned int arglen, void *buf, unsigned int buflen);
 extern int dvrdv_df_ioctl2(iomanX_iop_file_t *f, int cmd, void *arg, unsigned int arglen, void *buf, unsigned int buflen);
-extern s64 dvrdv_df_null_long();
 extern int dvrioctl2_dv_dubb_start(iomanX_iop_file_t *a1, const char *name, int cmd, void *arg, unsigned int arglen, void *buf, unsigned int buflen);
 extern int dvrioctl2_dv_dubb_stop(iomanX_iop_file_t *a1, const char *name, int cmd, void *arg, unsigned int arglen, void *buf, unsigned int buflen);
 extern int dvrioctl2_dv_dubb_rec_start(iomanX_iop_file_t *a1, const char *name, int cmd, void *arg, unsigned int arglen, void *buf, unsigned int buflen);
@@ -56,33 +55,33 @@ struct DevctlCmdTbl_t
 
 static iomanX_iop_device_ops_t DvrFuncTbl =
     {
-        &dvrdv_df_init,
-        &dvrdv_df_exit,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        &dvrdv_df_ioctl,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        (void *)&dvrdv_df_null_long,
-        &dvrdv_df_devctl,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        &dvrdv_df_ioctl2,
+        &dvrdv_df_init, // init
+        &dvrdv_df_exit, // deinit
+        NOT_SUPPORTED, // format
+        NOT_SUPPORTED, // open
+        NOT_SUPPORTED, // close
+        NOT_SUPPORTED, // read
+        NOT_SUPPORTED, // write
+        NOT_SUPPORTED, // lseek
+        &dvrdv_df_ioctl, // ioctl
+        NOT_SUPPORTED, // remove
+        NOT_SUPPORTED, // mkdir
+        NOT_SUPPORTED, // rmdir
+        NOT_SUPPORTED, // dopen
+        NOT_SUPPORTED, // dclose
+        NOT_SUPPORTED, // dread
+        NOT_SUPPORTED, // getstat
+        NOT_SUPPORTED, // chstat
+        NOT_SUPPORTED, // rename
+        NOT_SUPPORTED, // chdir
+        NOT_SUPPORTED, // sync
+        NOT_SUPPORTED, // mount
+        NOT_SUPPORTED, // umount
+        NOT_SUPPORTED_S64, // lseek64
+        &dvrdv_df_devctl, // devctl
+        NOT_SUPPORTED, // symlink
+        NOT_SUPPORTED, // readlink
+        &dvrdv_df_ioctl2, // ioctl2
     };
 static iomanX_iop_device_t DVR = {
     .name = "dvr_dv",
@@ -233,11 +232,6 @@ int dvrdv_df_ioctl2(
     return -EINVAL;
 }
 
-s64 dvrdv_df_null_long()
-{
-    return -134LL;
-}
-
 int dvrioctl2_dv_dubb_start(
     iomanX_iop_file_t *a1,
     const char *name,
diff --git a/iop/dvrp/dvrfile/src/dvrfile.c b/iop/dvrp/dvrfile/src/dvrfile.c
index 4df11045c78..3ceeddfba36 100644
--- a/iop/dvrp/dvrfile/src/dvrfile.c
+++ b/iop/dvrp/dvrfile/src/dvrfile.c
@@ -203,33 +203,33 @@ static int dvrf_translator_df_umount(iomanX_iop_file_t *f, const char *fsname)
 }
 
 static iomanX_iop_device_ops_t dvrf_translator_functbl = {
-    dvrf_df_init,
-    dvrf_df_exit,
-    dvrf_translator_df_format,
-    dvrf_translator_df_open,
-    dvrf_df_close,
-    dvrf_df_read,
-    dvrf_df_write,
-    dvrf_df_lseek,
-    dvrf_df_ioctl,
-    dvrf_translator_df_remove,
-    dvrf_translator_df_mkdir,
-    dvrf_translator_df_rmdir,
-    dvrf_translator_df_dopen,
-    dvrf_df_dclose,
-    dvrf_df_dread,
-    dvrf_translator_df_getstat,
-    dvrf_translator_df_chstat,
-    dvrf_translator_df_rename,
-    dvrf_translator_df_chdir,
-    dvrf_translator_df_sync,
-    dvrf_translator_df_mount,
-    dvrf_translator_df_umount,
-    dvrf_df_lseek64,
-    dvrf_translator_df_devctl,
-    dvrf_translator_df_symlink,
-    dvrf_translator_df_readlink,
-    dvrf_df_ioctl2,
+    dvrf_df_init, // init
+    dvrf_df_exit, // deinit
+    dvrf_translator_df_format, // format
+    dvrf_translator_df_open, // open
+    dvrf_df_close, // close
+    dvrf_df_read, // read
+    dvrf_df_write, // write
+    dvrf_df_lseek, // lseek
+    dvrf_df_ioctl, // ioctl
+    dvrf_translator_df_remove, // remove
+    dvrf_translator_df_mkdir, // mkdir
+    dvrf_translator_df_rmdir, // rmdir
+    dvrf_translator_df_dopen, // dopen
+    dvrf_df_dclose, // dclose
+    dvrf_df_dread, // dread
+    dvrf_translator_df_getstat, // getstat
+    dvrf_translator_df_chstat, // chstat
+    dvrf_translator_df_rename, // rename
+    dvrf_translator_df_chdir, // chdir
+    dvrf_translator_df_sync, // sync
+    dvrf_translator_df_mount, // mount
+    dvrf_translator_df_umount, // umount
+    dvrf_df_lseek64, // lseek64
+    dvrf_translator_df_devctl, // devctl
+    dvrf_translator_df_symlink, // symlink
+    dvrf_translator_df_readlink, // readlink
+    dvrf_df_ioctl2, // ioctl2
 };
 
 #define GEN_TRANSLATION_FUNCS(basefuncname, basedevname, shouldbswapformatarg, drvname) \
diff --git a/iop/dvrp/dvripl/src/dvripl.c b/iop/dvrp/dvripl/src/dvripl.c
index 0a518f0d967..b8d612f4b1f 100644
--- a/iop/dvrp/dvripl/src/dvripl.c
+++ b/iop/dvrp/dvripl/src/dvripl.c
@@ -34,39 +34,38 @@ extern int dvripl_df_exit(iomanX_iop_device_t *dev);
 extern int dvripl_df_ioctl(iomanX_iop_file_t *f, int cmd, void *param);
 extern int dvripl_df_devctl(iomanX_iop_file_t *a1, const char *name, int cmd, void *arg, unsigned int arglen, void *buf, unsigned int buflen);
 extern int dvripl_df_ioctl2(iomanX_iop_file_t *f, int cmd, void *arg, unsigned int arglen, void *buf, unsigned int buflen);
-extern s64 dvripl_df_null_long();
 extern int iplioctl2_update(iomanX_iop_file_t *a1, int cmd, void *arg);
 extern void dvr_ready(int a1, void *a2);
 
 static iomanX_iop_device_ops_t DvrFuncTbl =
     {
-        &dvripl_df_init,
-        &dvripl_df_exit,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        &dvripl_df_ioctl,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        &dvripl_df_null_long,
-        &dvripl_df_devctl,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        &dvripl_df_ioctl2,
+        &dvripl_df_init, // init
+        &dvripl_df_exit, // deinit
+        NOT_SUPPORTED, // format
+        NOT_SUPPORTED, // open
+        NOT_SUPPORTED, // close
+        NOT_SUPPORTED, // read
+        NOT_SUPPORTED, // write
+        NOT_SUPPORTED, // lseek
+        &dvripl_df_ioctl, // ioctl
+        NOT_SUPPORTED, // remove
+        NOT_SUPPORTED, // mkdir
+        NOT_SUPPORTED, // rmdir
+        NOT_SUPPORTED, // dopen
+        NOT_SUPPORTED, // dclose
+        NOT_SUPPORTED, // dread
+        NOT_SUPPORTED, // getstat
+        NOT_SUPPORTED, // chstat
+        NOT_SUPPORTED, // rename
+        NOT_SUPPORTED, // chdir
+        NOT_SUPPORTED, // sync
+        NOT_SUPPORTED, // mount
+        NOT_SUPPORTED, // umount
+        NOT_SUPPORTED_S64, // lseek64
+        &dvripl_df_devctl, // devctl
+        NOT_SUPPORTED, // symlink
+        NOT_SUPPORTED, // readlink
+        &dvripl_df_ioctl2, // ioctl2
     };
 s32 dvr_ready_flag;
 static iomanX_iop_device_t DVRMAN = {
@@ -199,11 +198,6 @@ int dvripl_df_ioctl2(iomanX_iop_file_t *f, int cmd, void *arg, unsigned int argl
     return -EINVAL;
 }
 
-s64 dvripl_df_null_long()
-{
-    return -134LL;
-}
-
 int iplioctl2_update(iomanX_iop_file_t *a1, int cmd, void *arg)
 {
     int total_size;
diff --git a/iop/dvrp/dvrmisc/src/dvrmisc.c b/iop/dvrp/dvrmisc/src/dvrmisc.c
index b0d2cfd4625..e6df45c966b 100644
--- a/iop/dvrp/dvrmisc/src/dvrmisc.c
+++ b/iop/dvrp/dvrmisc/src/dvrmisc.c
@@ -33,7 +33,6 @@ extern int dvrmisc_df_exit(iomanX_iop_device_t *dev);
 extern int dvrmisc_df_ioctl(iomanX_iop_file_t *f, int cmd, void *param);
 extern int dvrmisc_df_devctl(iomanX_iop_file_t *a1, const char *name, int cmd, void *arg, unsigned int arglen, void *buf, unsigned int buflen);
 extern int dvrmisc_df_ioctl2(iomanX_iop_file_t *f, int cmd, void *arg, unsigned int arglen, void *buf, unsigned int buflen);
-extern s64 dvrmisc_df_null_long();
 extern int dvrioctl2_nop(iomanX_iop_file_t *a1, int cmd, void *arg, unsigned int arglen, void *buf, unsigned int buflen);
 extern int dvrioctl2_version(iomanX_iop_file_t *a1, int cmd, void *arg, unsigned int arglen, void *buf, unsigned int buflen);
 extern int dvrioctl2_led_hdd_rec(iomanX_iop_file_t *a1, int cmd, void *arg, unsigned int arglen, void *buf, unsigned int buflen);
@@ -95,33 +94,33 @@ struct DevctlCmdTbl_t
 
 static iomanX_iop_device_ops_t DvrFuncTbl =
     {
-        &dvrmisc_df_init,
-        &dvrmisc_df_exit,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        &dvrmisc_df_ioctl,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        &dvrmisc_df_null_long,
-        &dvrmisc_df_devctl,
-        NOT_SUPPORTED,
-        NOT_SUPPORTED,
-        &dvrmisc_df_ioctl2,
+        &dvrmisc_df_init, // init
+        &dvrmisc_df_exit, // deinit
+        NOT_SUPPORTED, // format
+        NOT_SUPPORTED, // open
+        NOT_SUPPORTED, // close
+        NOT_SUPPORTED, // read
+        NOT_SUPPORTED, // write
+        NOT_SUPPORTED, // lseek
+        &dvrmisc_df_ioctl, // ioctl
+        NOT_SUPPORTED, // remove
+        NOT_SUPPORTED, // mkdir
+        NOT_SUPPORTED, // rmdir
+        NOT_SUPPORTED, // dopen
+        NOT_SUPPORTED, // dclose
+        NOT_SUPPORTED, // dread
+        NOT_SUPPORTED, // getstat
+        NOT_SUPPORTED, // chstat
+        NOT_SUPPORTED, // rename
+        NOT_SUPPORTED, // chdir
+        NOT_SUPPORTED, // sync
+        NOT_SUPPORTED, // mount
+        NOT_SUPPORTED, // umount
+        NOT_SUPPORTED_S64, // lseek64
+        &dvrmisc_df_devctl, // devctl
+        NOT_SUPPORTED, // symlink
+        NOT_SUPPORTED, // readlink
+        &dvrmisc_df_ioctl2, // ioctl2
     };
 static iomanX_iop_device_t DVRMISC = {
     .name = "dvr_misc",
@@ -276,11 +275,6 @@ int dvrmisc_df_ioctl2(
     return -EINVAL;
 }
 
-s64 dvrmisc_df_null_long()
-{
-    return -134LL;
-}
-
 int dvrioctl2_nop(iomanX_iop_file_t *a1, int cmd, void *arg, unsigned int arglen, void *buf, unsigned int buflen)
 {
     drvdrv_exec_cmd_ack cmdack;
diff --git a/iop/fs/bdmfs_fatfs/src/fs_driver.c b/iop/fs/bdmfs_fatfs/src/fs_driver.c
index 5a9ed9b0517..687d0ebaa0a 100644
--- a/iop/fs/bdmfs_fatfs/src/fs_driver.c
+++ b/iop/fs/bdmfs_fatfs/src/fs_driver.c
@@ -260,16 +260,6 @@ static DIR *fs_find_free_dir_structure(void)
     return NULL;
 }
 
-//---------------------------------------------------------------------------
-static int fs_init(iop_device_t *driver)
-{
-    M_DEBUG("%s\n", __func__);
-
-    (void)driver;
-
-    return 1;
-}
-
 //---------------------------------------------------------------------------
 static int fs_open(iop_file_t *fd, const char *name, int flags, int mode)
 {
@@ -792,33 +782,33 @@ static int fs_devctl(iop_file_t *fd, const char *name, int cmd, void *arg, unsig
 }
 
 static iop_device_ops_t fs_functarray = {
-    &fs_init,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    &fs_open,
-    &fs_close,
-    &fs_read,
-    &fs_write,
-    &fs_lseek,
-    &fs_ioctl,
-    &fs_remove,
-    &fs_mkdir,
-    &fs_remove,
-    &fs_dopen,
-    &fs_dclose,
-    &fs_dread,
-    &fs_getstat,
-    NOT_SUPPORTED,
-    &fs_rename,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    &fs_lseek64,
-    &fs_devctl,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    &fs_ioctl2,
+    DUMMY_IMPLEMENTATION, // init
+    DUMMY_IMPLEMENTATION, // deinit
+    NOT_SUPPORTED, // format
+    &fs_open, // open
+    &fs_close, // close
+    &fs_read, // read
+    &fs_write, // write
+    &fs_lseek, // lseek
+    &fs_ioctl, // ioctl
+    &fs_remove, // remove
+    &fs_mkdir, // mkdir
+    &fs_remove, // rmdir
+    &fs_dopen, // dopen
+    &fs_dclose, // dclose
+    &fs_dread, // dread
+    &fs_getstat, // getstat
+    NOT_SUPPORTED, // chstat
+    &fs_rename, // rename
+    NOT_SUPPORTED, // chdir
+    NOT_SUPPORTED, // sync
+    NOT_SUPPORTED, // mount
+    NOT_SUPPORTED, // umount
+    &fs_lseek64, // lseek64
+    &fs_devctl, // devctl
+    NOT_SUPPORTED, // symlink
+    NOT_SUPPORTED, // readlink
+    &fs_ioctl2, // ioctl2
 };
 static iop_device_t fs_driver = {
     "mass",
diff --git a/iop/fs/devfs/src/devfs.c b/iop/fs/devfs/src/devfs.c
index eff67ab0cc7..c7874e41c0a 100644
--- a/iop/fs/devfs/src/devfs.c
+++ b/iop/fs/devfs/src/devfs.c
@@ -325,26 +325,6 @@ devfs_device_t *devfs_find_deviceid(HDEV hDev)
    return NULL;
 }
 
-/** ioman init handler
- * @returns Always returns 0
- */
-int devfs_init(iop_device_t *dev)
-
-{
-   printf("devfs_init dev=%p\n", dev);
-   return 0;
-}
-
-/** ioman deinit handler
- * @returns Always returns 0
- */
-int devfs_deinit(iop_device_t *dev)
-
-{
-   printf("devfs_deinit dev=%p\n", dev);
-   return 0;
-}
-
 /** ioman open handler
  * @oaram file: Pointer to the ioman file structure
  * @param name: Name of file to open
@@ -1000,33 +980,33 @@ int devfs_getstat(iop_file_t *file, const char *name, iox_stat_t *stat)
 }
 
 static iop_device_ops_t devfs_ops = {
-  &devfs_init,
-  &devfs_deinit,
-  NOT_SUPPORTED,
-  &devfs_open,
-  &devfs_close,
-  &devfs_read,
-  NOT_SUPPORTED,
-  NOT_SUPPORTED,
-  &devfs_ioctl,
-  NOT_SUPPORTED,
-  NOT_SUPPORTED,
-  NOT_SUPPORTED,
-  &devfs_dopen,
-  &devfs_dclose,
-  &devfs_dread,
-  &devfs_getstat,
-  NOT_SUPPORTED,
-  NOT_SUPPORTED,
-  NOT_SUPPORTED,
-  NOT_SUPPORTED,
-  NOT_SUPPORTED,
-  NOT_SUPPORTED,
-  NOT_SUPPORTED,
-  NOT_SUPPORTED,
-  NOT_SUPPORTED,
-  NOT_SUPPORTED,
-  &devfs_ioctl2,
+  DUMMY_IMPLEMENTATION, // init
+  DUMMY_IMPLEMENTATION, // deinit
+  NOT_SUPPORTED, // format
+  &devfs_open, // open
+  &devfs_close, // close
+  &devfs_read, // read
+  NOT_SUPPORTED, // write
+  NOT_SUPPORTED, // lseek
+  &devfs_ioctl, // ioctl
+  NOT_SUPPORTED, // remove
+  NOT_SUPPORTED, // mkdir
+  NOT_SUPPORTED, // rmdir
+  &devfs_dopen, // dopen
+  &devfs_dclose, // dclose
+  &devfs_dread, // dread
+  &devfs_getstat, // getstat
+  NOT_SUPPORTED, // chstat
+  NOT_SUPPORTED, // rename
+  NOT_SUPPORTED, // chdir
+  NOT_SUPPORTED, // sync
+  NOT_SUPPORTED, // mount
+  NOT_SUPPORTED, // umount
+  NOT_SUPPORTED_S64, // lseek64
+  NOT_SUPPORTED, // devctl
+  NOT_SUPPORTED, // symlink
+  NOT_SUPPORTED, // readlink
+  &devfs_ioctl2, // ioctl2
 };
 
 static iop_device_t devfs_device = {
diff --git a/iop/fs/eromdrv/src/eromdrv.c b/iop/fs/eromdrv/src/eromdrv.c
index aadf310f0ff..69578066ef0 100644
--- a/iop/fs/eromdrv/src/eromdrv.c
+++ b/iop/fs/eromdrv/src/eromdrv.c
@@ -42,9 +42,7 @@ typedef struct erom_fdpriv_
 	u32 m_xordata_size;
 } erom_fdpriv_t;
 
-static int erom_nulldev(void);
 static int erom_op_close(iop_file_t *f);
-static int erom_op_write(iop_file_t *f, void *ptr, int size);
 static int erom_op_lseek(iop_file_t *f, int pos, int mode);
 static int erom_op_open(iop_file_t *f, const char *name, int mode);
 static int erom_op_read(iop_file_t *f, void *ptr, int size);
@@ -54,23 +52,23 @@ static erom_info_t *get_erom_info(const u32 *erom_start, const u32 *erom_end, er
 static const erom_dentry_t *get_direntry_by_name(erom_info_t *info, const char *name);
 
 static iop_device_ops_t erom_devops = {
-	(void *)erom_nulldev,
-	(void *)erom_nulldev,
-	(void *)erom_nulldev,
-	erom_op_open,
-	erom_op_close,
-	erom_op_read,
-	erom_op_write,
-	erom_op_lseek,
-	(void *)erom_nulldev,
-	(void *)erom_nulldev,
-	(void *)erom_nulldev,
-	(void *)erom_nulldev,
-	(void *)erom_nulldev,
-	(void *)erom_nulldev,
-	(void *)erom_nulldev,
-	(void *)erom_nulldev,
-	(void *)erom_nulldev,
+	DUMMY_IMPLEMENTATION, // init
+	DUMMY_IMPLEMENTATION, // deinit
+	NOT_SUPPORTED, // format
+	erom_op_open, // open
+	erom_op_close, // close
+	erom_op_read, // read
+	NOT_SUPPORTED, // write
+	erom_op_lseek, // lseek
+	NOT_SUPPORTED, // ioctl
+	NOT_SUPPORTED, // remove
+	NOT_SUPPORTED, // mkdir
+	NOT_SUPPORTED, // rmdir
+	NOT_SUPPORTED, // dopen
+	NOT_SUPPORTED, // dclose
+	NOT_SUPPORTED, // dread
+	NOT_SUPPORTED, // getstat
+	NOT_SUPPORTED, // chstat
 };
 
 static iop_device_t erom_dev = {
@@ -85,11 +83,6 @@ static erom_fdpriv_t erom_fdpriv;
 static erom_info_t erom_info;
 static const erom_dentry_t *erom_dentry;
 
-static int erom_nulldev(void)
-{
-	return 0;
-}
-
 static int erom_op_close(iop_file_t *f)
 {
 	(void)f;
@@ -99,15 +92,6 @@ static int erom_op_close(iop_file_t *f)
 	return 0;
 }
 
-static int erom_op_write(iop_file_t *f, void *ptr, int size)
-{
-	(void)f;
-	(void)ptr;
-	(void)size;
-
-	return -EIO;
-}
-
 static int erom_op_lseek(iop_file_t *f, int pos, int mode)
 {
 	erom_fdpriv_t *privdata;
diff --git a/iop/fs/fakehost/src/fakehost.c b/iop/fs/fakehost/src/fakehost.c
index 36d622437b5..ce122570b89 100644
--- a/iop/fs/fakehost/src/fakehost.c
+++ b/iop/fs/fakehost/src/fakehost.c
@@ -104,27 +104,6 @@ int realfd( iop_io_file_t *f )
 	return (int) f->privdata;
 }
 
-/** Dummy function, for where needed.
- * @ingroup fakehost
- */
-int dummy()
-{
-	M_DEBUG("dummy function called\n");
-	return -EIO;
-}
-
-/** Initialise fs driver.
- * @ingroup fakehost
- *
- * @param driver  io_device pointer to device
- * @return Status (0=successful).
- */
-int fd_initialize( iop_io_device_t *driver)
-{
-	M_PRINTF( "initializing '%s' file driver.\n", driver->name );
-	return 0;
-}
-
 /** Handle open request.
  * @ingroup fakehost
  *
@@ -197,23 +176,23 @@ int fd_lseek( iop_io_file_t *fd, int offset, int whence)
 
 // Function array for fileio structure.
 static iop_io_device_ops_t functions = {
-	&fd_initialize,
-	(void *)&dummy,
-	(void *)&dummy,
-	&fd_open,
-	&fd_close,
-	&fd_read,
-	(void *)&dummy,
-	&fd_lseek,
-	(void *)&dummy,
-	(void *)&dummy,
-	(void *)&dummy,
-	(void *)&dummy,
-	(void *)&dummy,
-	(void *)&dummy,
-	(void *)&dummy,
-	(void *)&dummy,
-	(void *)&dummy,
+	DUMMY_IMPLEMENTATION, // init
+	DUMMY_IMPLEMENTATION, // deinit
+	NOT_SUPPORTED, // format
+	&fd_open, // open
+	&fd_close, // close
+	&fd_read, // read
+	NOT_SUPPORTED, // write
+	&fd_lseek, // lseek
+	NOT_SUPPORTED, // ioctl
+	NOT_SUPPORTED, // remove
+	NOT_SUPPORTED, // mkdir
+	NOT_SUPPORTED, // rmdir
+	NOT_SUPPORTED, // dopen
+	NOT_SUPPORTED, // dclose
+	NOT_SUPPORTED, // dread
+	NOT_SUPPORTED, // getstat
+	NOT_SUPPORTED, // chstat
 };
 
 // FileIO structure.
diff --git a/iop/fs/http/src/ps2http.c b/iop/fs/http/src/ps2http.c
index aa917b50798..542d0711981 100644
--- a/iop/fs/http/src/ps2http.c
+++ b/iop/fs/http/src/ps2http.c
@@ -38,6 +38,7 @@
 #include <errno.h>
 #include <ioman_mod.h>
 #include <sysmem.h>
+#include <ioman.h>
 
 #include "ps2ip.h"
 
@@ -347,24 +348,6 @@ const char *resolveAddress( struct sockaddr_in *server, const char * url, char *
 #endif
 }
 
-/**
- * Any calls we don't implement calls dummy.
- */
-int httpDummy()
-{
-	M_PRINTF("dummy function called\n");
-	return -EIO;
-}
-
-int httpInitialize(iop_io_device_t *driver)
-{
-	(void)driver;
-
-	M_PRINTF("filesystem driver initialized\n");
-
-	return 0;
-}
-
 /**
  * Open has the most work to do in the file driver.  It must:
  *
@@ -500,23 +483,23 @@ int httpLseek(iop_io_file_t *f, int offset, int mode)
 
 
 static iop_io_device_ops_t ps2httpOps = {
-	&httpInitialize,
-	(void *)&httpDummy,
-	(void *)&httpDummy,
+	DUMMY_IMPLEMENTATION,
+	DUMMY_IMPLEMENTATION,
+	NOT_SUPPORTED,
 	&httpOpen,
 	&httpClose,
 	&httpRead,
-	(void *)&httpDummy,
+	NOT_SUPPORTED,
 	&httpLseek,
-	(void *)&httpDummy,
-	(void *)&httpDummy,
-	(void *)&httpDummy,
-	(void *)&httpDummy,
-	(void *)&httpDummy,
-	(void *)&httpDummy,
-	(void *)&httpDummy,
-	(void *)&httpDummy,
-	(void *)&httpDummy,
+	NOT_SUPPORTED,
+	NOT_SUPPORTED,
+	NOT_SUPPORTED,
+	NOT_SUPPORTED,
+	NOT_SUPPORTED,
+	NOT_SUPPORTED,
+	NOT_SUPPORTED,
+	NOT_SUPPORTED,
+	NOT_SUPPORTED,
 };
 
 static iop_io_device_t ps2httpDev = {
diff --git a/iop/fs/romdrv/src/romdrv.c b/iop/fs/romdrv/src/romdrv.c
index 1eb68bcc437..da2e08accaa 100644
--- a/iop/fs/romdrv/src/romdrv.c
+++ b/iop/fs/romdrv/src/romdrv.c
@@ -42,34 +42,32 @@ static struct RomFileSlot fileSlots[ROMDRV_MAX_FILES];
 
 /* Function prototypes */
 static int init(void);
-static int romUnsupported(void);
-static int romInit(iop_device_t *device);
 static int romOpen(iop_file_t *fd, const char *path, int mode);
 static int romClose(iop_file_t *);
 static int romRead(iop_file_t *fd, void *buffer, int size);
-static int romWrite(iop_file_t *fd, void *buffer, int size);
 static int romLseek(iop_file_t *fd, int offset, int whence);
 static struct RomImg *romGetImageStat(const void *start, const void *end, struct RomImg *ImageStat);
 static struct RomdirFileStat *GetFileStatFromImage(const struct RomImg *ImageStat, const char *filename, struct RomdirFileStat *stat);
 
 static iop_device_ops_t ops = {
-    &romInit,
-    (void *)&romUnsupported,
-    (void *)&romUnsupported,
-    &romOpen,
-    &romClose,
-    &romRead,
-    &romWrite,
-    &romLseek,
-    (void *)&romUnsupported,
-    (void *)&romUnsupported,
-    (void *)&romUnsupported,
-    (void *)&romUnsupported,
-    (void *)&romUnsupported,
-    (void *)&romUnsupported,
-    (void *)&romUnsupported,
-    (void *)&romUnsupported,
-    (void *)&romUnsupported};
+    DUMMY_IMPLEMENTATION, // init
+    DUMMY_IMPLEMENTATION, // deinit
+    NOT_SUPPORTED, // format
+    &romOpen, // open
+    &romClose, // close
+    &romRead, // read
+    NOT_SUPPORTED, // write
+    &romLseek, // lseek
+    NOT_SUPPORTED, // ioctl
+    NOT_SUPPORTED, // remove
+    NOT_SUPPORTED, // mkdir
+    NOT_SUPPORTED, // rmdir
+    NOT_SUPPORTED, // dopen
+    NOT_SUPPORTED, // dclose
+    NOT_SUPPORTED, // dread
+    NOT_SUPPORTED, // getstat
+    NOT_SUPPORTED, // chstat
+};
 
 static iop_device_t DeviceOps = {
     "rom",
@@ -110,18 +108,6 @@ static int init(void)
     return 0;
 }
 
-static int romUnsupported(void)
-{
-    return 0;
-}
-
-static int romInit(iop_device_t *device)
-{
-    (void)device;
-
-    return 0;
-}
-
 int romAddDevice(int unit, const void *image)
 {
     int result, OldState;
@@ -265,15 +251,6 @@ static int romRead(iop_file_t *fd, void *buffer, int size)
     return size;
 }
 
-static int romWrite(iop_file_t *fd, void *buffer, int size)
-{
-    (void)fd;
-    (void)buffer;
-    (void)size;
-
-    return -EIO;
-}
-
 static int romLseek(iop_file_t *fd, int offset, int whence)
 {
     struct RomFileSlot *slot = (struct RomFileSlot *)fd->privdata;
diff --git a/iop/fs/subfile/src/subfile.c b/iop/fs/subfile/src/subfile.c
index c400fc1afb5..afb41ffddab 100644
--- a/iop/fs/subfile/src/subfile.c
+++ b/iop/fs/subfile/src/subfile.c
@@ -16,7 +16,6 @@
 IRX_ID(MODNAME, 2, 1);
 // Based on the module from PBPX-95216
 
-static int subfile_op_nulldev(void);
 static int subfile_op_open(iop_file_t *f, const char *name, int mode);
 static int subfile_op_close(iop_file_t *f);
 static int subfile_op_read(iop_file_t *f, void *ptr, int size);
@@ -31,23 +30,23 @@ typedef struct subfile_priv_fd_
 } subfile_priv_fd_t;
 
 static iop_device_ops_t subfile_devops = {
-	(void *)subfile_op_nulldev,
-	(void *)subfile_op_nulldev,
-	(void *)subfile_op_nulldev,
-	subfile_op_open,
-	subfile_op_close,
-	subfile_op_read,
-	(void *)subfile_op_nulldev,
-	subfile_op_lseek,
-	(void *)subfile_op_nulldev,
-	(void *)subfile_op_nulldev,
-	(void *)subfile_op_nulldev,
-	(void *)subfile_op_nulldev,
-	(void *)subfile_op_nulldev,
-	(void *)subfile_op_nulldev,
-	(void *)subfile_op_nulldev,
-	(void *)subfile_op_nulldev,
-	(void *)subfile_op_nulldev,
+	DUMMY_IMPLEMENTATION, // init
+	DUMMY_IMPLEMENTATION, // deinit
+	NOT_SUPPORTED, // format
+	subfile_op_open, // open
+	subfile_op_close, // close
+	subfile_op_read, // read
+	NOT_SUPPORTED, // write
+	subfile_op_lseek, // lseek
+	NOT_SUPPORTED, // ioctl
+	NOT_SUPPORTED, // remove
+	NOT_SUPPORTED, // mkdir
+	NOT_SUPPORTED, // rmdir
+	NOT_SUPPORTED, // dopen
+	NOT_SUPPORTED, // dclose
+	NOT_SUPPORTED, // dread
+	NOT_SUPPORTED, // getstat
+	NOT_SUPPORTED, // chstat
 };
 static iop_device_t subfile_dev = {
 	"subfile",
@@ -161,11 +160,6 @@ static int subfile_op_open(iop_file_t *f, const char *name, int mode)
 	return 0;
 }
 
-static int subfile_op_nulldev(void)
-{
-	return 0;
-}
-
 static int subfile_op_close(iop_file_t *f)
 {
 	subfile_priv_fd_t *privdata;
diff --git a/iop/fs/vfat/src/fs_driver.c b/iop/fs/vfat/src/fs_driver.c
index fa19f8f7508..a7ca70a3eaa 100644
--- a/iop/fs/vfat/src/fs_driver.c
+++ b/iop/fs/vfat/src/fs_driver.c
@@ -996,40 +996,40 @@ static int fs_ioctl2(iop_file_t *fd, int cmd, void *data, unsigned int datalen,
 
 #ifndef WIN32
 static iop_device_ops_t fs_functarray = {
-    &fs_init,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    &fs_open,
-    &fs_close,
-    &fs_read,
-    &fs_write,
-    &fs_lseek,
-    &fs_ioctl,
-    &fs_remove,
-    &fs_mkdir,
-    &fs_rmdir,
-    &fs_dopen,
-    &fs_dclose,
-    &fs_dread,
-    &fs_getstat,
-    NOT_SUPPORTED,
-    &fs_rename,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
+    &fs_init, // init
+    DUMMY_IMPLEMENTATION, // deinit
+    NOT_SUPPORTED, // format
+    &fs_open, // open
+    &fs_close, // close
+    &fs_read, // read
+    &fs_write, // write
+    &fs_lseek, // lseek
+    &fs_ioctl, // ioctl
+    &fs_remove, // remove
+    &fs_mkdir, // mkdir
+    &fs_rmdir, // rmdir
+    &fs_dopen, // dopen
+    &fs_dclose, // dclose
+    &fs_dread, // dread
+    &fs_getstat, // getstat
+    NOT_SUPPORTED, // chstat
+    &fs_rename, // rename
+    NOT_SUPPORTED, // chdir
+    NOT_SUPPORTED, // sync
+    NOT_SUPPORTED, // mount
+    NOT_SUPPORTED, // umount
+    NOT_SUPPORTED_S64, // lseek64
 #ifndef BUILDING_IEEE1394_DISK
-    &fs_devctl,
+    &fs_devctl, // devctl
 #else
-    NOT_SUPPORTED,
+    NOT_SUPPORTED, // devctl
 #endif /* BUILDING_IEEE1394_DISK */
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
+    NOT_SUPPORTED, // symlink
+    NOT_SUPPORTED, // readlink
 #if !defined(BUILDING_IEEE1394_DISK) && !defined(BUILDING_USBHDFSD)
-    &fs_ioctl2,
+    &fs_ioctl2, // ioctl2
 #else
-    NOT_SUPPORTED,
+    NOT_SUPPORTED, // ioctl2
 #endif /* BUILDING_IEEE1394_DISK */
 };
 static iop_device_t fs_driver = {
diff --git a/iop/hdd/apa/src/hdd.c b/iop/hdd/apa/src/hdd.c
index 816abe84fa2..3940f3ad773 100644
--- a/iop/hdd/apa/src/hdd.c
+++ b/iop/hdd/apa/src/hdd.c
@@ -40,33 +40,33 @@ IRX_ID("hdd_driver", APA_MODVER_MAJOR, APA_MODVER_MINOR);
 #endif
 
 static iomanX_iop_device_ops_t hddOps={
-	&hddInit,
-	&hddDeinit,
-	&hddFormat,
-	&hddOpen,
-	&hddClose,
-	&hddRead,
-	&hddWrite,
-	&hddLseek,
-	NOT_SUPPORTED,
-	&hddRemove,
-	NOT_SUPPORTED,
-	NOT_SUPPORTED,
-	&hddDopen,
-	&hddClose,
-	&hddDread,
-	&hddGetStat,
-	NOT_SUPPORTED,
-	&hddReName,
-	NOT_SUPPORTED,
-	NOT_SUPPORTED,
-	hddMount,
-	hddUmount,
-	NOT_SUPPORTED,
-	&hddDevctl,
-	NOT_SUPPORTED,
-	NOT_SUPPORTED,
-	&hddIoctl2,
+	&hddInit, // init
+	&hddDeinit, // deinit
+	&hddFormat, // format
+	&hddOpen, // open
+	&hddClose, // close
+	&hddRead, // read
+	&hddWrite, // write
+	&hddLseek, // lseek
+	NOT_SUPPORTED, // ioctl
+	&hddRemove, // remove
+	NOT_SUPPORTED, // mkdir
+	NOT_SUPPORTED, // rmdir
+	&hddDopen, // dopen
+	&hddClose, // dclose
+	&hddDread, // dread
+	&hddGetStat, // getstat
+	NOT_SUPPORTED, // chstat
+	&hddReName, // rename
+	NOT_SUPPORTED, // chdir
+	NOT_SUPPORTED, // sync
+	hddMount, // mount
+	hddUmount, // umount
+	NOT_SUPPORTED_S64, // lseek64
+	&hddDevctl, // devctl
+	NOT_SUPPORTED, // symlink
+	NOT_SUPPORTED, // readlink
+	&hddIoctl2, // ioctl2
 };
 static iomanX_iop_device_t hddFioDev={
 	"hdd",
diff --git a/iop/hdd/fsck/src/fsck.c b/iop/hdd/fsck/src/fsck.c
index 17048ee0325..de951e3fad4 100644
--- a/iop/hdd/fsck/src/fsck.c
+++ b/iop/hdd/fsck/src/fsck.c
@@ -895,12 +895,6 @@ static void FsckThread(void *arg)
     SetEventFlag(fsckEventFlagID, 1);
 }
 
-// 0x0000264c
-static int FsckUnsupported(void)
-{
-    return 0;
-}
-
 // 0x00000340
 static int fsckCheckBitmap(pfs_mount_t *mount, void *buffer)
 {
@@ -1218,33 +1212,33 @@ static int FsckIoctl2(iomanX_iop_file_t *fd, int cmd, void *arg, unsigned int ar
 }
 
 static iomanX_iop_device_ops_t FsckDeviceOps = {
-    (void *)&FsckUnsupported,
-    (void *)&FsckUnsupported,
-    NULL,
-    &FsckOpen,
-    &FsckClose,
-    NULL,
-    NULL,
-    NULL,
-    (void *)&FsckUnsupported,
-    (void *)&FsckUnsupported,
-    (void *)&FsckUnsupported,
-    (void *)&FsckUnsupported,
-    (void *)&FsckUnsupported,
-    (void *)&FsckUnsupported,
-    (void *)&FsckUnsupported,
-    (void *)&FsckUnsupported,
-    (void *)&FsckUnsupported,
-    (void *)&FsckUnsupported,
-    (void *)&FsckUnsupported,
-    (void *)&FsckUnsupported,
-    (void *)&FsckUnsupported,
-    (void *)&FsckUnsupported,
-    (void *)&FsckUnsupported,
-    (void *)&FsckUnsupported,
-    (void *)&FsckUnsupported,
-    (void *)&FsckUnsupported,
-    &FsckIoctl2};
+    DUMMY_IMPLEMENTATION, // init
+    DUMMY_IMPLEMENTATION, // deinit
+    NOT_SUPPORTED, // format
+    &FsckOpen, // open
+    &FsckClose, // close
+    NOT_SUPPORTED, // read
+    NOT_SUPPORTED, // write
+    NOT_SUPPORTED, // lseek
+    NOT_SUPPORTED, // ioctl
+    NOT_SUPPORTED, // remove
+    NOT_SUPPORTED, // mkdir
+    NOT_SUPPORTED, // rmdir
+    NOT_SUPPORTED, // dopen
+    NOT_SUPPORTED, // dclose
+    NOT_SUPPORTED, // dread
+    NOT_SUPPORTED, // getstat
+    NOT_SUPPORTED, // chstat
+    NOT_SUPPORTED, // rename
+    NOT_SUPPORTED, // chdir
+    NOT_SUPPORTED, // sync
+    NOT_SUPPORTED, // mount
+    NOT_SUPPORTED, // umount
+    NOT_SUPPORTED_S64, // lseek64
+    NOT_SUPPORTED, // devctl
+    NOT_SUPPORTED, // symlink
+    NOT_SUPPORTED, // readlink
+    &FsckIoctl2}; // ioctl2
 
 static iomanX_iop_device_t FsckDevice = {
     "fsck",
diff --git a/iop/hdd/fssk/src/fssk.c b/iop/hdd/fssk/src/fssk.c
index 38de566320f..35b64b04d26 100644
--- a/iop/hdd/fssk/src/fssk.c
+++ b/iop/hdd/fssk/src/fssk.c
@@ -563,11 +563,6 @@ static void FsskThread(pfs_mount_t *mount)
     SetEventFlag(fsskEventFlagID, 1);
 }
 
-static int FsskUnsupported(void)
-{
-    return 0;
-}
-
 static int FsskOpen(iomanX_iop_file_t *fd, const char *name, int flags, int mode)
 {
     int blockfd, result;
@@ -721,33 +716,33 @@ static int FsskIoctl2(iomanX_iop_file_t *fd, int cmd, void *arg, unsigned int ar
 }
 
 static iomanX_iop_device_ops_t FsskDeviceOps = {
-    (void *)&FsskUnsupported,
-    (void *)&FsskUnsupported,
-    NULL,
-    &FsskOpen,
-    &FsskClose,
-    NULL,
-    NULL,
-    NULL,
-    (void *)&FsskUnsupported,
-    (void *)&FsskUnsupported,
-    (void *)&FsskUnsupported,
-    (void *)&FsskUnsupported,
-    (void *)&FsskUnsupported,
-    (void *)&FsskUnsupported,
-    (void *)&FsskUnsupported,
-    (void *)&FsskUnsupported,
-    (void *)&FsskUnsupported,
-    (void *)&FsskUnsupported,
-    (void *)&FsskUnsupported,
-    (void *)&FsskUnsupported,
-    (void *)&FsskUnsupported,
-    (void *)&FsskUnsupported,
-    (void *)&FsskUnsupported,
-    (void *)&FsskUnsupported,
-    (void *)&FsskUnsupported,
-    (void *)&FsskUnsupported,
-    &FsskIoctl2};
+    DUMMY_IMPLEMENTATION, // init
+    DUMMY_IMPLEMENTATION, // deinit
+    NOT_SUPPORTED, // format
+    &FsskOpen, // open
+    &FsskClose, // close
+    NOT_SUPPORTED, // read
+    NOT_SUPPORTED, // write
+    NOT_SUPPORTED, // lseek
+    NOT_SUPPORTED, // ioctl
+    NOT_SUPPORTED, // remove
+    NOT_SUPPORTED, // mkdir
+    NOT_SUPPORTED, // rmdir
+    NOT_SUPPORTED, // dopen
+    NOT_SUPPORTED, // dclose
+    NOT_SUPPORTED, // dread
+    NOT_SUPPORTED, // getstat
+    NOT_SUPPORTED, // chstat
+    NOT_SUPPORTED, // rename
+    NOT_SUPPORTED, // chdir
+    NOT_SUPPORTED, // sync
+    NOT_SUPPORTED, // mount
+    NOT_SUPPORTED, // umount
+    NOT_SUPPORTED_S64, // lseek64
+    NOT_SUPPORTED, // devctl
+    NOT_SUPPORTED, // symlink
+    NOT_SUPPORTED, // readlink
+    &FsskIoctl2}; // ioctl2
 
 static iomanX_iop_device_t FsskDevice = {
     "fssk",
diff --git a/iop/hdd/hdck/src/hdck.c b/iop/hdd/hdck/src/hdck.c
index e739a3588f5..8644311a9d3 100644
--- a/iop/hdd/hdck/src/hdck.c
+++ b/iop/hdd/hdck/src/hdck.c
@@ -34,33 +34,34 @@ static u8 IOBuffer[128 * 512];
 static u8 IOBuffer2[128 * 512];
 
 static iomanX_iop_device_ops_t HdckDeviceOps = {
-    &HdckInit,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    &HdckDevctl,
-    NULL,
-    NULL,
-    NULL};
+    &HdckInit, // init
+    DUMMY_IMPLEMENTATION, // deinit
+    NOT_SUPPORTED, // format
+    NOT_SUPPORTED, // open
+    NOT_SUPPORTED, // close
+    NOT_SUPPORTED, // read
+    NOT_SUPPORTED, // write
+    NOT_SUPPORTED, // lseek
+    NOT_SUPPORTED, // ioctl
+    NOT_SUPPORTED, // remove
+    NOT_SUPPORTED, // mkdir
+    NOT_SUPPORTED, // rmdir
+    NOT_SUPPORTED, // dopen
+    NOT_SUPPORTED, // dclose
+    NOT_SUPPORTED, // dread
+    NOT_SUPPORTED, // getstat
+    NOT_SUPPORTED, // chstat
+    NOT_SUPPORTED, // rename
+    NOT_SUPPORTED, // chdir
+    NOT_SUPPORTED, // sync
+    NOT_SUPPORTED, // mount
+    NOT_SUPPORTED, // umount
+    NOT_SUPPORTED_S64, // lseek64
+    &HdckDevctl, // devctl
+    NOT_SUPPORTED, // symlink
+    NOT_SUPPORTED, // readlink
+    NOT_SUPPORTED, // ioctl2
+};
 
 static iomanX_iop_device_t HdckDevice = {
     "hdck",
diff --git a/iop/hdd/hdsk/src/hdsk.c b/iop/hdd/hdsk/src/hdsk.c
index 1b50344da57..a1f9a0b32e5 100644
--- a/iop/hdd/hdsk/src/hdsk.c
+++ b/iop/hdd/hdsk/src/hdsk.c
@@ -725,33 +725,33 @@ static int HdskDevctl(iomanX_iop_file_t *fd, const char *name, int cmd, void *ar
 }
 
 static iomanX_iop_device_ops_t HdskDeviceOps = {
-    &HdskInit,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    &HdskDevctl,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
+    &HdskInit, // init
+    DUMMY_IMPLEMENTATION, // deinit
+    NOT_SUPPORTED, // format
+    NOT_SUPPORTED, // open
+    NOT_SUPPORTED, // close
+    NOT_SUPPORTED, // read
+    NOT_SUPPORTED, // write
+    NOT_SUPPORTED, // lseek
+    NOT_SUPPORTED, // ioctl
+    NOT_SUPPORTED, // remove
+    NOT_SUPPORTED, // mkdir
+    NOT_SUPPORTED, // rmdir
+    NOT_SUPPORTED, // dopen
+    NOT_SUPPORTED, // dclose
+    NOT_SUPPORTED, // dread
+    NOT_SUPPORTED, // getstat
+    NOT_SUPPORTED, // chstat
+    NOT_SUPPORTED, // rename
+    NOT_SUPPORTED, // chdir
+    NOT_SUPPORTED, // sync
+    NOT_SUPPORTED, // mount
+    NOT_SUPPORTED, // umount
+    NOT_SUPPORTED_S64, // lseek64
+    &HdskDevctl, // devctl
+    NOT_SUPPORTED, // symlink
+    NOT_SUPPORTED, // readlink
+    NOT_SUPPORTED, // ioctl2
 };
 
 static iomanX_iop_device_t HdskDevice = {
diff --git a/iop/hdd/pfs/src/pfs.c b/iop/hdd/pfs/src/pfs.c
index 20163038f4c..e6ea5e26526 100644
--- a/iop/hdd/pfs/src/pfs.c
+++ b/iop/hdd/pfs/src/pfs.c
@@ -37,33 +37,33 @@ IRX_ID("pfs_driver", PFS_MAJOR, PFS_MINOR);
 //	Globals
 
 static iomanX_iop_device_ops_t pfsOps = {
-	&pfsFioInit,
-	&pfsFioDeinit,
-	&pfsFioFormat,
-	&pfsFioOpen,
-	&pfsFioClose,
-	&pfsFioRead,
-	&pfsFioWrite,
-	&pfsFioLseek,
-	&pfsFioIoctl,
-	&pfsFioRemove,
-	&pfsFioMkdir,
-	&pfsFioRmdir,
-	&pfsFioDopen,
-	&pfsFioClose,
-	&pfsFioDread,
-	&pfsFioGetstat,
-	&pfsFioChstat,
-	&pfsFioRename,
-	&pfsFioChdir,
-	&pfsFioSync,
-	&pfsFioMount,
-	&pfsFioUmount,
-	&pfsFioLseek64,
-	&pfsFioDevctl,
-	&pfsFioSymlink,
-	&pfsFioReadlink,
-	&pfsFioIoctl2,
+	&pfsFioInit, // init
+	&pfsFioDeinit, // deinit
+	&pfsFioFormat, // format
+	&pfsFioOpen, // open
+	&pfsFioClose, // close
+	&pfsFioRead, // read
+	&pfsFioWrite, // write
+	&pfsFioLseek, // lseek
+	&pfsFioIoctl, // ioctl
+	&pfsFioRemove, // remove
+	&pfsFioMkdir, // mkdir
+	&pfsFioRmdir, // rmdir
+	&pfsFioDopen, // dopen
+	&pfsFioClose, // dclose
+	&pfsFioDread, // dread
+	&pfsFioGetstat, // getstat
+	&pfsFioChstat, // chstat
+	&pfsFioRename, // rename
+	&pfsFioChdir, // chdir
+	&pfsFioSync, // sync
+	&pfsFioMount, // mount
+	&pfsFioUmount, // umount
+	&pfsFioLseek64, // lseek64
+	&pfsFioDevctl, // devctl
+	&pfsFioSymlink, // symlink
+	&pfsFioReadlink, // readlink
+	&pfsFioIoctl2, // ioctl2
 };
 
 static iomanX_iop_device_t pfsFioDev = {
diff --git a/iop/kernel/include/ioman.h b/iop/kernel/include/ioman.h
index c73562b3395..42b386268da 100644
--- a/iop/kernel/include/ioman.h
+++ b/iop/kernel/include/ioman.h
@@ -71,8 +71,14 @@ typedef struct _iop_device {
 	struct _iop_device_ops *ops;
 } iop_device_t;
 
-static inline int not_supported_op (void) {return -ENOTSUP;}
-#define NOT_SUPPORTED (void*)&not_supported_op
+static inline int not_supported_int(void) {return -ENOTSUP;}
+static inline signed long long not_supported_s64(void) {return -ENOTSUP;}
+static inline int dummy_implementation_int(void) { return 0; }
+static inline signed long long dummy_implementation_s64(void) { return 0; }
+#define NOT_SUPPORTED (void*)&not_supported_int
+#define NOT_SUPPORTED_S64 (void*)&not_supported_s64
+#define DUMMY_IMPLEMENTATION (void*)&dummy_implementation_int
+#define DUMMY_IMPLEMENTATION_S64 (void*)&dummy_implementation_s64
 
 typedef struct _iop_device_ops {
 	int	(*init)(iop_device_t *);
diff --git a/iop/kernel/include/iomanX.h b/iop/kernel/include/iomanX.h
index 14bb5f82903..12aeb042f25 100644
--- a/iop/kernel/include/iomanX.h
+++ b/iop/kernel/include/iomanX.h
@@ -88,8 +88,14 @@ typedef struct _iomanX_iop_device {
 	struct _iomanX_iop_device_ops *ops;
 } iomanX_iop_device_t;
 
-static inline int not_supported_op (void) {return -ENOTSUP;}
-#define NOT_SUPPORTED (void*)&not_supported_op
+static inline int not_supported_int(void) {return -ENOTSUP;}
+static inline signed long long not_supported_s64(void) {return -ENOTSUP;}
+static inline int dummy_implementation_int(void) { return 0; }
+static inline signed long long dummy_implementation_s64(void) { return 0; }
+#define NOT_SUPPORTED (void*)&not_supported_int
+#define NOT_SUPPORTED_S64 (void*)&not_supported_s64
+#define DUMMY_IMPLEMENTATION (void*)&dummy_implementation_int
+#define DUMMY_IMPLEMENTATION_S64 (void*)&dummy_implementation_s64
 
 typedef struct _iomanX_iop_device_ops {
 	int	(*init)(iomanX_iop_device_t *);
diff --git a/iop/network/smbman/src/smb_fio.c b/iop/network/smbman/src/smb_fio.c
index aad39ab3c4b..9a99dfdda08 100644
--- a/iop/network/smbman/src/smb_fio.c
+++ b/iop/network/smbman/src/smb_fio.c
@@ -26,33 +26,33 @@ int smbman_io_sema;
 
 // driver ops func tab
 static iop_device_ops_t smbman_ops = {
-    &smb_init,
-    &smb_deinit,
-    NOT_SUPPORTED,
-    &smb_open,
-    &smb_close,
-    &smb_read,
-    &smb_write,
-    &smb_lseek,
-    NOT_SUPPORTED,
-    &smb_remove,
-    &smb_mkdir,
-    &smb_rmdir,
-    &smb_dopen,
-    &smb_dclose,
-    &smb_dread,
-    &smb_getstat,
-    NOT_SUPPORTED,
-    &smb_rename,
-    &smb_chdir,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    &smb_lseek64,
-    &smb_devctl,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED
+    &smb_init, // init
+    &smb_deinit, // deinit
+    NOT_SUPPORTED, // format
+    &smb_open, // open
+    &smb_close, // close
+    &smb_read, // read
+    &smb_write, // write
+    &smb_lseek, // lseek
+    NOT_SUPPORTED, // ioctl
+    &smb_remove, // remove
+    &smb_mkdir, // mkdir
+    &smb_rmdir, // rmdir
+    &smb_dopen, // dopen
+    &smb_dclose, // dclose
+    &smb_dread, // dread
+    &smb_getstat, // getstat
+    NOT_SUPPORTED, // chstat
+    &smb_rename, // rename
+    &smb_chdir, // chdir
+    NOT_SUPPORTED, // sync
+    NOT_SUPPORTED, // mount
+    NOT_SUPPORTED, // umount
+    &smb_lseek64, // lseek64
+    &smb_devctl, // devctl
+    NOT_SUPPORTED, // symlink
+    NOT_SUPPORTED, // readlink
+    NOT_SUPPORTED // ioctl2
 };
 
 // driver descriptor
diff --git a/iop/network/udptty/src/udptty.c b/iop/network/udptty/src/udptty.c
index 2deccb9492c..8263705bde1 100644
--- a/iop/network/udptty/src/udptty.c
+++ b/iop/network/udptty/src/udptty.c
@@ -44,23 +44,23 @@ static int tty_write(iop_file_t *file, void *buf, size_t size);
 
 /* device ops */
 static iop_device_ops_t tty_ops = {
-    tty_init,
-    tty_deinit,
-    NOT_SUPPORTED,
-    (void *)tty_stdout_fd,
-    (void *)tty_stdout_fd,
-    NOT_SUPPORTED,
-    (void *)tty_write,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
-    NOT_SUPPORTED,
+    tty_init, // init
+    tty_deinit, // deinit
+    NOT_SUPPORTED, // format
+    (void *)tty_stdout_fd, // open
+    (void *)tty_stdout_fd, // close
+    NOT_SUPPORTED, // read
+    (void *)tty_write, // write
+    NOT_SUPPORTED, // lseek
+    NOT_SUPPORTED, // ioctl
+    NOT_SUPPORTED, // remove
+    NOT_SUPPORTED, // mkdir
+    NOT_SUPPORTED, // rmdir
+    NOT_SUPPORTED, // dopen
+    NOT_SUPPORTED, // dclose
+    NOT_SUPPORTED, // dread
+    NOT_SUPPORTED, // getstat
+    NOT_SUPPORTED, // chstat
 };
 
 /* device descriptor */
diff --git a/iop/system/ioman/src/ioman.c b/iop/system/ioman/src/ioman.c
index 735e17cc1b5..01cd85f798c 100644
--- a/iop/system/ioman/src/ioman.c
+++ b/iop/system/ioman/src/ioman.c
@@ -36,6 +36,8 @@ IRX_ID("IO/File_Manager", 1, 1);
 
 #include "errno.h"
 
+#include <ioman.h>
+
 #define MAX_DEVICES 16
 #define MAX_FILES   16
 
@@ -50,29 +52,24 @@ static int should_print_known_devices = 1;
 extern struct irx_export_table _exp_ioman;
 #endif
 
-static int tty_noop()
-{
-	return 0;
-}
-
 iop_io_device_ops_t tty_dev_operations = {
-	&tty_noop,
-	&tty_noop,
-	&tty_noop,
-	&tty_noop,
-	&tty_noop,
-	&tty_noop,
-	&tty_noop,
-	&tty_noop,
-	&tty_noop,
-	&tty_noop,
-	&tty_noop,
-	&tty_noop,
-	&tty_noop,
-	&tty_noop,
-	&tty_noop,
-	&tty_noop,
-	&tty_noop,
+	DUMMY_IMPLEMENTATION,
+	DUMMY_IMPLEMENTATION,
+	NOT_SUPPORTED,
+	NOT_SUPPORTED,
+	NOT_SUPPORTED,
+	NOT_SUPPORTED,
+	NOT_SUPPORTED,
+	NOT_SUPPORTED,
+	NOT_SUPPORTED,
+	NOT_SUPPORTED,
+	NOT_SUPPORTED,
+	NOT_SUPPORTED,
+	NOT_SUPPORTED,
+	NOT_SUPPORTED,
+	NOT_SUPPORTED,
+	NOT_SUPPORTED,
+	NOT_SUPPORTED,
 };
 
 iop_io_device_t tty_device = {
diff --git a/iop/system/iomanx/src/iomanX.c b/iop/system/iomanx/src/iomanX.c
index ea13e71071b..7485af6487c 100644
--- a/iop/system/iomanx/src/iomanX.c
+++ b/iop/system/iomanx/src/iomanX.c
@@ -85,33 +85,33 @@ struct ioman_dev_listentry
 static int showdrvflag = 1;
 #ifndef IOMANX_ENABLE_LEGACY_IOMAN_HOOK
 static iomanX_iop_device_ops_t dev_tty_dev_operations = {
-	(void *)&tty_noop,
-	(void *)&tty_noop,
-	(void *)&tty_noop,
-	(void *)&tty_noop,
-	(void *)&tty_noop,
-	(void *)&tty_noop,
-	(void *)&tty_noop,
-	(void *)&tty_noop,
-	(void *)&tty_noop,
-	(void *)&tty_noop,
-	(void *)&tty_noop,
-	(void *)&tty_noop,
-	(void *)&tty_noop,
-	(void *)&tty_noop,
-	(void *)&tty_noop,
-	(void *)&tty_noop,
-	(void *)&tty_noop,
-	NULL,
-	NULL,
-	NULL,
-	NULL,
-	NULL,
-	NULL,
-	NULL,
-	NULL,
-	NULL,
-	NULL,
+	DUMMY_IMPLEMENTATION, // init
+	DUMMY_IMPLEMENTATION, // deinit
+	NOT_SUPPORTED, // format
+	NOT_SUPPORTED, // open
+	NOT_SUPPORTED, // close
+	NOT_SUPPORTED, // read
+	NOT_SUPPORTED, // write
+	NOT_SUPPORTED, // lseek
+	NOT_SUPPORTED, // ioctl
+	NOT_SUPPORTED, // remove
+	NOT_SUPPORTED, // mkdir
+	NOT_SUPPORTED, // rmdir
+	NOT_SUPPORTED, // dopen
+	NOT_SUPPORTED, // dclose
+	NOT_SUPPORTED, // dread
+	NOT_SUPPORTED, // getstat
+	NOT_SUPPORTED, // chstat
+	NOT_SUPPORTED, // rename
+	NOT_SUPPORTED, // chdir
+	NOT_SUPPORTED, // sync
+	NOT_SUPPORTED, // mount
+	NOT_SUPPORTED, // umount
+	NOT_SUPPORTED_S64, // lseek64
+	NOT_SUPPORTED, // devctl
+	NOT_SUPPORTED, // symlink
+	NOT_SUPPORTED, // readlink
+	NOT_SUPPORTED, // ioctl2
 };
 static iomanX_iop_device_t dev_tty = {
 	"tty",
@@ -1012,13 +1012,6 @@ static const char *parsefile(const char *path, iomanX_iop_device_t **p_device, i
 
 // Unofficial: unused "io request for unsupported operation" func removed
 
-#ifndef IOMANX_ENABLE_LEGACY_IOMAN_HOOK
-static int tty_noop(void)
-{
-	return 0;
-}
-#endif
-
 int iomanX_AddDrv(iomanX_iop_device_t *device)
 {
 #ifdef IOMANX_USE_DEVICE_LINKED_LIST
diff --git a/iop/usb/keyboard/src/ps2kbd.c b/iop/usb/keyboard/src/ps2kbd.c
index d6be352e41d..db0758788ce 100644
--- a/iop/usb/keyboard/src/ps2kbd.c
+++ b/iop/usb/keyboard/src/ps2kbd.c
@@ -1112,23 +1112,23 @@ int fio_close(iop_file_t *f)
 
 static iop_device_ops_t fio_ops =
 {
-  &fio_init,
-  NOT_SUPPORTED,
-  &fio_format,
-  &fio_open,
-  &fio_close,
-  &fio_read,
-  NOT_SUPPORTED,
-  NOT_SUPPORTED,
-  &fio_ioctl,
-  NOT_SUPPORTED,
-  NOT_SUPPORTED,
-  NOT_SUPPORTED,
-  NOT_SUPPORTED,
-  NOT_SUPPORTED,
-  NOT_SUPPORTED,
-  NOT_SUPPORTED,
-  NOT_SUPPORTED,
+  &fio_init, // init
+  DUMMY_IMPLEMENTATION, // deinit
+  &fio_format, // format
+  &fio_open, // open
+  &fio_close, // close
+  &fio_read, // read
+  NOT_SUPPORTED, // write
+  NOT_SUPPORTED, // lseek
+  &fio_ioctl, // ioctl
+  NOT_SUPPORTED, // remove
+  NOT_SUPPORTED, // mkdir
+  NOT_SUPPORTED, // rmdir
+  NOT_SUPPORTED, // dopen
+  NOT_SUPPORTED, // dclose
+  NOT_SUPPORTED, // dread
+  NOT_SUPPORTED, // getstat
+  NOT_SUPPORTED, // chstat
 };
 
 static iop_device_t kbd_filedrv = {