Daily Archives: 8 November 2016

The disk is offline because it has a signature collision with another disk that is online 1

 in Windows  tagged disk / diskpart / uniqueid by

Recently, we cloned a hard disk using dd.
When we booted into Windows, the new drive was not visible.
After checking with the disk utilities, we got the following informative message:

The disk is offline because it has a signature collision with another disk that is online

To resolve the issue, we used diskpart.
To start diskpart, press the key combination Win + R which will pop up the Run prompt.
Type diskpart in the input box and hit the Enter key.

A new terminal window will appear.
Using that we identified the two disks and changed the label for the second one.

First step:

We issued list disk to get the list of disks.

DISKPART

Microsoft DiskPart version 10.0.14393.0
Copyright (C) 1999-2013 Microsoft Corporation.
On computer: BYTEFREAKS-NET

DISKPART> list disk

  Disk ###  Status         Size     Free     Dyn  Gpt
  --------  -------------  -------  -------  ---  ---
  Disk 0    Online          931 GB      0 B
  Disk 1    Offline         465 GB      0 B

Second step:

We issued select disk 1 so that we could process the disk 1 that was offline and using uniqueid disk we got the signature of the disk.

DISKPART> select disk 1
Disk 1 is now the selected disk.

DISKPART> uniqueid disk
Disk ID: 09FC13CB

Third step:

Set the signature of the disk to a random value other than the one that it already had using the command uniqueid disk ID=FFAABBCCDD

DISKPART> uniqueid disk ID=FFAABBCCDD

DISKPART> uniqueid disk
Disk ID: FFAABBCCDD

The random value must be 8 characters long and each character must be a value between 0-9 or A-F.

Finally:

Restart the machine to get both disks running.

Compiling GobiNet on Ubuntu 16.04 64bit

 in GNU/Linux  tagged atomic_long_read / atomic_read / f_dentry / f_path.dentry / GobiNet / module_exit by

Recently, we tried to compile the GobiNet drivers for Linux on an Ubuntu 16.04 64bit machine.

The version of GobiNet was GobiNet_2016-10-20.tar.gz ([download id=”2179″]).

To our surprise, we got a errors while compiling.

Solution:

Get the full project after it was patched from here: [download id=”3342″]

or

Download the following patched version of QMIDevice.c and replace it on your machine [download id=”2183″].

Download the following patched version of GobiUSBNet.c and replace it on your machine [download id=”3352″].

Errors/Warnings:

First warning: return from incompatible pointer type [-Wincompatible-pointer-types] (GobiUSBNet.c:1692:13)

We got the following warning:

 module_exit(GobiUSBNetModExit);
             ^
include/linux/module.h:135:11: note: in definition of macro ‘module_exit’
  { return exitfn; }     \

module_exit is defined as follows:

typedef void (*exitcall_t)(void);
#define module_exit(exitfn)                                     \
         static inline exitcall_t __exittest(void)               \
         { return exitfn; }                                      \
         void cleanup_module(void) __attribute__((alias(#exitfn)));

So we see that we need to update static int GobiUSBNetModExit(void) to become static void GobiUSBNetModExit(void) and have it return nothing.

GobiUSBNet.c:1669 
@@ -1666,11 +1666,11 @@ RETURN VALUE: 
    void 
 ===========================================================================*/ 
 // static int GobiUSBNetModExit(struct platform_device *pdev) 
-static int GobiUSBNetModExit(void) 
+static void GobiUSBNetModExit(void) 
 { 
    usb_deregister( &GobiNet ); 
    class_destroy( gpClass ); 
-   return 0; 
+   return; 
 }

Second warning: passing argument 1 of ‘atomic_read’ from incompatible pointer type [-Wincompatible-pointer-types] (QMIDevice.c:2393:21)

On this 64bit architecture the f_count of the struct file  is defined as long (64bit) so we should not use atomic_read but atomic_long_read instead.

@@ -2390,7 +2390,7 @@ int UserspaceClose(
    }
 
    // Fallthough.  If f_count == 1 no need to do more checks
-   if (atomic_read( &pFilp->f_count ) != 1)
+   if (atomic_long_read( &pFilp->f_count ) != 1)^M
    {
       rcu_read_lock();
       for_each_process( pEachTask )

First error: ‘struct file’ has no member named ‘f_dentry’ (in 9 placed of QMIDevice.c)

The error was error: struct file has no member named f_dentry
Apparently, there was a change in the struct that contained f_dentry in the kernel 3.19 source code which created this bug.

@@ -2269,7 +2269,7 @@ int UserspaceIOCTL(
    if (IsDeviceValid( pFilpData->mpDev ) == false)
    {
       DBG( "Invalid device! Updating f_ops\n" );
-      pFilp->f_op = pFilp->f_dentry->d_inode->i_fop;
+      pFilp->f_op = pFilp->f_path.dentry->d_inode->i_fop;^M
       return -ENXIO;
    }
 
@@ -2427,7 +2427,7 @@ int UserspaceClose(
    if (IsDeviceValid( pFilpData->mpDev ) == false)
    {
       DBG( "Invalid device! Updating f_ops\n" );
-      pFilp->f_op = pFilp->f_dentry->d_inode->i_fop;
+      pFilp->f_op = pFilp->f_path.dentry->d_inode->i_fop;^M
       return -ENXIO;
    }
    
@@ -2486,7 +2486,7 @@ ssize_t UserspaceRead(
    if (IsDeviceValid( pFilpData->mpDev ) == false)
    {
       DBG( "Invalid device! Updating f_ops\n" );
-      pFilp->f_op = pFilp->f_dentry->d_inode->i_fop;
+      pFilp->f_op = pFilp->f_path.dentry->d_inode->i_fop;^M
       return -ENXIO;
    }
    
@@ -2567,7 +2567,7 @@ ssize_t UserspaceWrite(
    if (IsDeviceValid( pFilpData->mpDev ) == false)
    {
       DBG( "Invalid device! Updating f_ops\n" );
-      pFilp->f_op = pFilp->f_dentry->d_inode->i_fop;
+      pFilp->f_op = pFilp->f_path.dentry->d_inode->i_fop;^M
       return -ENXIO;
    }
 
@@ -2646,7 +2646,7 @@ unsigned int UserspacePoll(
    if (IsDeviceValid( pFilpData->mpDev ) == false)
    {
       DBG( "Invalid device! Updating f_ops\n" );
-      pFilp->f_op = pFilp->f_dentry->d_inode->i_fop;
+      pFilp->f_op = pFilp->f_path.dentry->d_inode->i_fop;^M
       return POLLERR;
    }
 
@@ -3003,9 +3003,9 @@ void DeregisterQMIDevice( sGobiUSBNet * pDev )
             for (count = 0; count < pFDT->max_fds; count++)
             {
                pFilp = pFDT->fd[count];
-               if (pFilp != NULL &&  pFilp->f_dentry != NULL)
+               if (pFilp != NULL &&  pFilp->f_path.dentry != NULL)^M
                {
-                  if (pFilp->f_dentry->d_inode == pOpenInode)
+                  if (pFilp->f_path.dentry->d_inode == pOpenInode)^M
                   {
                      // Close this file handle
                      rcu_assign_pointer( pFDT->fd[count], NULL );                     
@@ -3050,9 +3050,9 @@ void DeregisterQMIDevice( sGobiUSBNet * pDev )
                for (count = 0; count < pFDT->max_fds; count++)
                {
                   pFilp = pFDT->fd[count];
-                  if (pFilp != NULL &&  pFilp->f_dentry != NULL)
+                  if (pFilp != NULL &&  pFilp->f_path.dentry != NULL)^M
                   {
-                     if (pFilp->f_dentry->d_inode == pOpenInode)
+                     if (pFilp->f_path.dentry->d_inode == pOpenInode)^M
                      {
                         // Close this file handle
                         rcu_assign_pointer( pFDT->fd[count], NULL );

—

Following is the original output of the make commands before and while we were patching the source files.

george@ubuntu-1604:~/Downloads$ lsb_release -a
No LSB modules are available.
Distributor ID:    Ubuntu
Description:    Ubuntu 16.04.1 LTS
Release:    16.04
Codename:    xenial

george@ubuntu-1604:~/Downloads$ wget https://portland.source.codeaurora.org/patches/quic/gobi/Gobi_Linux/GobiNet_2016-10-20.tar.gz
--2017-04-24 10:05:54--  https://portland.source.codeaurora.org/patches/quic/gobi/Gobi_Linux/GobiNet_2016-10-20.tar.gz
Resolving portland.source.codeaurora.org (portland.source.codeaurora.org)... 198.145.29.80
Connecting to portland.source.codeaurora.org (portland.source.codeaurora.org)|198.145.29.80|:443... connected.
HTTP request sent, awaiting response... 200 OK
Length: 43818 (43K) [application/x-gzip]
Saving to: ‘GobiNet_2016-10-20.tar.gz’

GobiNet_2016-10-20.tar 100%[===========================>]  42,79K   111KB/s    in 0,4s    

2017-04-24 10:05:56 (111 KB/s) - ‘GobiNet_2016-10-20.tar.gz’ saved [43818/43818]

george@ubuntu-1604:~/Downloads$ tar -xzf GobiNet_2016-10-20.tar.gz 
george@ubuntu-1604:~/Downloads$ cd gobiusbnet/
george@ubuntu-1604:~/Downloads/gobiusbnet$ make
rm -rf *.o *~ core .depend .*.cmd *.ko *.mod.c .tmp_versions Module.* modules.order
make -C /lib/modules/4.4.0-57-generic/build M=/home/george/Downloads/gobiusbnet modules
make[1]: Entering directory '/usr/src/linux-headers-4.4.0-57-generic'
  CC [M]  /home/george/Downloads/gobiusbnet/qmap.o
  CC [M]  /home/george/Downloads/gobiusbnet/GobiUSBNet.o
In file included from include/linux/phy.h:22:0,
                 from include/net/dsa.h:19,
                 from include/linux/netdevice.h:44,
                 from include/linux/etherdevice.h:26,
                 from /home/george/Downloads/gobiusbnet/Structs.h:47,
                 from /home/george/Downloads/gobiusbnet/GobiUSBNet.c:57:
/home/george/Downloads/gobiusbnet/GobiUSBNet.c: In function ‘__exittest’:
/home/george/Downloads/gobiusbnet/GobiUSBNet.c:1692:13: warning: return from incompatible pointer type [-Wincompatible-pointer-types]
 module_exit(GobiUSBNetModExit);
             ^
include/linux/module.h:135:11: note: in definition of macro ‘module_exit’
  { return exitfn; }     \
           ^
  CC [M]  /home/george/Downloads/gobiusbnet/QMIDevice.o
/home/george/Downloads/gobiusbnet/QMIDevice.c: In function ‘UserspaceIOCTL’:
/home/george/Downloads/gobiusbnet/QMIDevice.c:2272:26: error: ‘struct file’ has no member named ‘f_dentry’
       pFilp->f_op = pFilp->f_dentry->d_inode->i_fop;
                          ^
/home/george/Downloads/gobiusbnet/QMIDevice.c: In function ‘UserspaceClose’:
/home/george/Downloads/gobiusbnet/QMIDevice.c:2393:21: warning: passing argument 1 of ‘atomic_read’ from incompatible pointer type [-Wincompatible-pointer-types]
    if (atomic_read( &pFilp->f_count ) != 1)
                     ^
In file included from include/linux/atomic.h:4:0,
                 from ./arch/x86/include/asm/thread_info.h:53,
                 from include/linux/thread_info.h:54,
                 from ./arch/x86/include/asm/preempt.h:6,
                 from include/linux/preempt.h:59,
                 from include/linux/spinlock.h:50,
                 from include/linux/mm_types.h:8,
                 from include/linux/kmemcheck.h:4,
                 from include/linux/skbuff.h:18,
                 from include/linux/if_ether.h:23,
                 from include/linux/etherdevice.h:25,
                 from /home/george/Downloads/gobiusbnet/Structs.h:47,
                 from /home/george/Downloads/gobiusbnet/QMIDevice.h:95,
                 from /home/george/Downloads/gobiusbnet/QMIDevice.c:91:
./arch/x86/include/asm/atomic.h:25:28: note: expected ‘const atomic_t * {aka const struct <anonymous> *}’ but argument is of type ‘atomic_long_t * {aka struct <anonymous> *}’
 static __always_inline int atomic_read(const atomic_t *v)
                            ^
/home/george/Downloads/gobiusbnet/QMIDevice.c:2430:26: error: ‘struct file’ has no member named ‘f_dentry’
       pFilp->f_op = pFilp->f_dentry->d_inode->i_fop;
                          ^
/home/george/Downloads/gobiusbnet/QMIDevice.c: In function ‘UserspaceRead’:
/home/george/Downloads/gobiusbnet/QMIDevice.c:2489:26: error: ‘struct file’ has no member named ‘f_dentry’
       pFilp->f_op = pFilp->f_dentry->d_inode->i_fop;
                          ^
/home/george/Downloads/gobiusbnet/QMIDevice.c: In function ‘UserspaceWrite’:
/home/george/Downloads/gobiusbnet/QMIDevice.c:2570:26: error: ‘struct file’ has no member named ‘f_dentry’
       pFilp->f_op = pFilp->f_dentry->d_inode->i_fop;
                          ^
/home/george/Downloads/gobiusbnet/QMIDevice.c: In function ‘UserspacePoll’:
/home/george/Downloads/gobiusbnet/QMIDevice.c:2649:26: error: ‘struct file’ has no member named ‘f_dentry’
       pFilp->f_op = pFilp->f_dentry->d_inode->i_fop;
                          ^
/home/george/Downloads/gobiusbnet/QMIDevice.c: In function ‘DeregisterQMIDevice’:
/home/george/Downloads/gobiusbnet/QMIDevice.c:3006:43: error: ‘struct file’ has no member named ‘f_dentry’
                if (pFilp != NULL &&  pFilp->f_dentry != NULL)
                                           ^
/home/george/Downloads/gobiusbnet/QMIDevice.c:3008:28: error: ‘struct file’ has no member named ‘f_dentry’
                   if (pFilp->f_dentry->d_inode == pOpenInode)
                            ^
/home/george/Downloads/gobiusbnet/QMIDevice.c:3053:46: error: ‘struct file’ has no member named ‘f_dentry’
                   if (pFilp != NULL &&  pFilp->f_dentry != NULL)
                                              ^
/home/george/Downloads/gobiusbnet/QMIDevice.c:3055:31: error: ‘struct file’ has no member named ‘f_dentry’
                      if (pFilp->f_dentry->d_inode == pOpenInode)
                               ^
scripts/Makefile.build:258: recipe for target '/home/george/Downloads/gobiusbnet/QMIDevice.o' failed
make[2]: *** [/home/george/Downloads/gobiusbnet/QMIDevice.o] Error 1
Makefile:1420: recipe for target '_module_/home/george/Downloads/gobiusbnet' failed
make[1]: *** [_module_/home/george/Downloads/gobiusbnet] Error 2
make[1]: Leaving directory '/usr/src/linux-headers-4.4.0-57-generic'
Makefile:8: recipe for target 'all' failed
make: *** [all] Error 2


george@ubuntu-1604:~/Downloads/gobiusbnet$ git diff
diff --git a/GobiUSBNet.c b/GobiUSBNet.c
index b8151e2..3b88372 100644
--- a/GobiUSBNet.c
+++ b/GobiUSBNet.c
@@ -1666,11 +1666,11 @@ RETURN VALUE:
    void
 ===========================================================================*/
 // static int GobiUSBNetModExit(struct platform_device *pdev)
-static int GobiUSBNetModExit(void)
+static void GobiUSBNetModExit(void)
 {
    usb_deregister( &GobiNet );
    class_destroy( gpClass );
-   return 0;
+   return;
 }
 
 #if 0
diff --git a/QMIDevice.c b/QMIDevice.c
index e7b3f72..6be39a6 100644
--- a/QMIDevice.c
+++ b/QMIDevice.c
@@ -2269,7 +2269,7 @@ int UserspaceIOCTL(
    if (IsDeviceValid( pFilpData->mpDev ) == false)
    {
       DBG( "Invalid device! Updating f_ops\n" );
-      pFilp->f_op = pFilp->f_dentry->d_inode->i_fop;
+      pFilp->f_op = pFilp->f_path.dentry->d_inode->i_fop;^M
       return -ENXIO;
    }
 
@@ -2390,7 +2390,7 @@ int UserspaceClose(
    }
 
    // Fallthough.  If f_count == 1 no need to do more checks
-   if (atomic_read( &pFilp->f_count ) != 1)
+   if (atomic_long_read( &pFilp->f_count ) != 1)^M
    {
       rcu_read_lock();
       for_each_process( pEachTask )
@@ -2427,7 +2427,7 @@ int UserspaceClose(
    if (IsDeviceValid( pFilpData->mpDev ) == false)
    {
       DBG( "Invalid device! Updating f_ops\n" );
-      pFilp->f_op = pFilp->f_dentry->d_inode->i_fop;
+      pFilp->f_op = pFilp->f_path.dentry->d_inode->i_fop;^M
       return -ENXIO;
    }
    
@@ -2486,7 +2486,7 @@ ssize_t UserspaceRead(
    if (IsDeviceValid( pFilpData->mpDev ) == false)
    {
       DBG( "Invalid device! Updating f_ops\n" );
-      pFilp->f_op = pFilp->f_dentry->d_inode->i_fop;
+      pFilp->f_op = pFilp->f_path.dentry->d_inode->i_fop;^M
       return -ENXIO;
    }
    
@@ -2567,7 +2567,7 @@ ssize_t UserspaceWrite(
    if (IsDeviceValid( pFilpData->mpDev ) == false)
    {
       DBG( "Invalid device! Updating f_ops\n" );
-      pFilp->f_op = pFilp->f_dentry->d_inode->i_fop;
+      pFilp->f_op = pFilp->f_path.dentry->d_inode->i_fop;^M
       return -ENXIO;
    }
 
@@ -2646,7 +2646,7 @@ unsigned int UserspacePoll(
    if (IsDeviceValid( pFilpData->mpDev ) == false)
    {
       DBG( "Invalid device! Updating f_ops\n" );
-      pFilp->f_op = pFilp->f_dentry->d_inode->i_fop;
+      pFilp->f_op = pFilp->f_path.dentry->d_inode->i_fop;^M
       return POLLERR;
    }
 
@@ -3003,9 +3003,9 @@ void DeregisterQMIDevice( sGobiUSBNet * pDev )
             for (count = 0; count < pFDT->max_fds; count++)
             {
                pFilp = pFDT->fd[count];
-               if (pFilp != NULL &&  pFilp->f_dentry != NULL)
+               if (pFilp != NULL &&  pFilp->f_path.dentry != NULL)^M
                {
-                  if (pFilp->f_dentry->d_inode == pOpenInode)
+                  if (pFilp->f_path.dentry->d_inode == pOpenInode)^M
                   {
                      // Close this file handle
                      rcu_assign_pointer( pFDT->fd[count], NULL );                     
@@ -3050,9 +3050,9 @@ void DeregisterQMIDevice( sGobiUSBNet * pDev )
                for (count = 0; count < pFDT->max_fds; count++)
                {
                   pFilp = pFDT->fd[count];
-                  if (pFilp != NULL &&  pFilp->f_dentry != NULL)
+                  if (pFilp != NULL &&  pFilp->f_path.dentry != NULL)^M
                   {
-                     if (pFilp->f_dentry->d_inode == pOpenInode)
+                     if (pFilp->f_path.dentry->d_inode == pOpenInode)^M
                      {
                         // Close this file handle
                         rcu_assign_pointer( pFDT->fd[count], NULL );     

george@ubuntu-1604:~/Downloads/gobiusbnet$ make
rm -rf *.o *~ core .depend .*.cmd *.ko *.mod.c .tmp_versions Module.* modules.order
make -C /lib/modules/4.4.0-57-generic/build M=/home/george/Downloads/gobiusbnet modules
make[1]: Entering directory '/usr/src/linux-headers-4.4.0-57-generic'
  CC [M]  /home/george/Downloads/gobiusbnet/qmap.o
  CC [M]  /home/george/Downloads/gobiusbnet/GobiUSBNet.o
  CC [M]  /home/george/Downloads/gobiusbnet/QMIDevice.o
  CC [M]  /home/george/Downloads/gobiusbnet/QMI.o
  LD [M]  /home/george/Downloads/gobiusbnet/GobiNet.o
  Building modules, stage 2.
  MODPOST 1 modules
  CC      /home/george/Downloads/gobiusbnet/GobiNet.mod.o
  LD [M]  /home/george/Downloads/gobiusbnet/GobiNet.ko
make[1]: Leaving directory '/usr/src/linux-headers-4.4.0-57-generic'