mkdir: cannot create directory `/sys/kernel/config/target/iscsi': Invalid argument

mkdir: cannot create directory `/sys/kernel/config/target/iscsi': Invalid argument

[Raju]

Hi,
I can't able create an iscsi target because of some problem in configfs:


Below are the steps I followed in Debian Lenny(upgraded kernel to 2.6.39.2):

#!/bin/sh
# BEGIN CONFIG FOR CONFIGFS USAGE
modprobe configfs
mount -t configfs none /sys/kernel/config
# END CONFIG FOR CONFIGFS USAGE

# BEGIN CONFIGFS CODE FOR GENERIC TARGET ENGINE
modprobe target_core_mod
export CONFIGFS=/sys/kernel/config/
export TARGET=/sys/kernel/config/target/core/
export FABRIC=/sys/kernel/config/target/iscsi/
# END CONFIGFS CODE FOR GENERIC TARGET ENGINE

# START RAMDISK SUBSYSTEM PLUGIN OBJECTS
mkdir -p $TARGET/rd_mcp_0/ramdisk
echo rd_pages=32768 > $TARGET/rd_mcp_0/ramdisk/control
echo 1 > $TARGET/rd_mcp_0/ramdisk/enable
# END RAMDISK SUBSYSTEM PLUGIN OBJECTS

# BEGIN CONFIGFS CODE FOR LINUX ISCSI TARGET (LIO-TARGET)
DEF_IQN="iqn.2003-01.org.linux-iscsi.target.i686:sn.e475ed6fcdd0"
# Define the first iSCSI Network Portal
PORTAL1="10.0.0.1:3260"
# The first mkdir(2) to $FABRIC will load iscsi_target_mod
mkdir -p "$FABRIC/$DEF_IQN/tpgt_1/np/$PORTAL1"
mkdir: cannot create directory `/sys/kernel/config/target/iscsi': 
Invalid argument


AND KERNEL LOG:

[10443.799266] CORE_HBA[0] - TCM Ramdisk HBA Driver v4.0 on Generic 
        Target CoreStack v4.0.0-rc7-ml
[10443.799272] CORE_HBA[0] - Attached Ramdisk HBA: 0 to Generic Target 
        Core TCQDepth: 256 MaxSectors: 1024
[10443.799278] CORE_HBA[1] - Attached HBA to Generic Target Core
[10443.799329] Target_Core_ConfigFS: Allocated struct se_subsystem_dev:
        f4ee1000se_dev_su_ptr: f4e3e2c0
[10443.800370] Missing rd_pages= parameter
[10443.805761] Target_Core_ConfigFS: REGISTER-> group:f8552220 name:iscsi
[10443.838505] target_core_get_fabric() failed for iscsi
[10443.841826] Target_Core_ConfigFS: REGISTER-> group:f8552220 name:iscsi
[10443.875313] target_core_get_fabric() failed for iscsi
[10443.878496] Target_Core_ConfigFS: REGISTER-> group:f8552220 name:iscsi
[10443.910039] target_core_get_fabric() failed for iscsi
[10443.921684] Target_Core_ConfigFS: REGISTER-> group:f8552220 name:iscsi
[10443.951926] target_core_get_fabric() failed for iscsi



Please suggest any idea,


Thanks,
Raju.

Re: mkdir: cannot create directory `/sys/kernel/config/target/iscsi': Invalid argument

[Douglas Gilbert]

ping ....

Could some target folks please answer the following question?

I get the same show stopper on lk 3.0.4 :

root@test:/sys/kernel/config# mkdir target
mkdir: cannot create directory `target': No such file or directory

Doug Gilbert


On 11-07-19 11:17 AM, Raju wrote:
> Hi,
> I can't able create an iscsi target because of some problem in configfs:
>
>
> Below are the steps I followed in Debian Lenny(upgraded kernel to 2.6.39.2):
>
> #!/bin/sh
> # BEGIN CONFIG FOR CONFIGFS USAGE
> modprobe configfs
> mount -t configfs none /sys/kernel/config
> # END CONFIG FOR CONFIGFS USAGE
>
> # BEGIN CONFIGFS CODE FOR GENERIC TARGET ENGINE
> modprobe target_core_mod
> export CONFIGFS=/sys/kernel/config/
> export TARGET=/sys/kernel/config/target/core/
> export FABRIC=/sys/kernel/config/target/iscsi/
> # END CONFIGFS CODE FOR GENERIC TARGET ENGINE
>
> # START RAMDISK SUBSYSTEM PLUGIN OBJECTS
> mkdir -p $TARGET/rd_mcp_0/ramdisk
> echo rd_pages=32768>  $TARGET/rd_mcp_0/ramdisk/control
> echo 1>  $TARGET/rd_mcp_0/ramdisk/enable
> # END RAMDISK SUBSYSTEM PLUGIN OBJECTS
>
> # BEGIN CONFIGFS CODE FOR LINUX ISCSI TARGET (LIO-TARGET)
> DEF_IQN="iqn.2003-01.org.linux-iscsi.target.i686:sn.e475ed6fcdd0"
> # Define the first iSCSI Network Portal
> PORTAL1="10.0.0.1:3260"
> # The first mkdir(2) to $FABRIC will load iscsi_target_mod
> mkdir -p "$FABRIC/$DEF_IQN/tpgt_1/np/$PORTAL1"
> mkdir: cannot create directory `/sys/kernel/config/target/iscsi':
> Invalid argument
>
>
> AND KERNEL LOG:
>
> [10443.799266] CORE_HBA[0] - TCM Ramdisk HBA Driver v4.0 on Generic
>          Target CoreStack v4.0.0-rc7-ml
> [10443.799272] CORE_HBA[0] - Attached Ramdisk HBA: 0 to Generic Target
>          Core TCQDepth: 256 MaxSectors: 1024
> [10443.799278] CORE_HBA[1] - Attached HBA to Generic Target Core
> [10443.799329] Target_Core_ConfigFS: Allocated struct se_subsystem_dev:
>          f4ee1000se_dev_su_ptr: f4e3e2c0
> [10443.800370] Missing rd_pages= parameter
> [10443.805761] Target_Core_ConfigFS: REGISTER->  group:f8552220 name:iscsi
> [10443.838505] target_core_get_fabric() failed for iscsi
> [10443.841826] Target_Core_ConfigFS: REGISTER->  group:f8552220 name:iscsi
> [10443.875313] target_core_get_fabric() failed for iscsi
> [10443.878496] Target_Core_ConfigFS: REGISTER->  group:f8552220 name:iscsi
> [10443.910039] target_core_get_fabric() failed for iscsi
> [10443.921684] Target_Core_ConfigFS: REGISTER->  group:f8552220 name:iscsi
> [10443.951926] target_core_get_fabric() failed for iscsi
>
>
>
> Please suggest any idea,
>
>
> Thanks,
> Raju.

Re: mkdir: cannot create directory `/sys/kernel/config/target/iscsi': Invalid argument

[Douglas Gilbert]

Well I can answer my own question.
configfs doesn't seem to be mounted at /sys/kernel/config
and even when it is, superuser cannot create a directory
there. So mount configfs somewhere else:

mount -t configfs none /tmp/config

Then in reference to this page:
   http://linux-iscsi.org/wiki/Target/configFS

change this line:
   export TARGET=/sys/kernel/config/target/core/
to
   export TARGET=/tmp/config/target/core/
then continue.

BTW The target infrastructure creates this noise in the log:
   "Unable to load target_core_stgt"
There is no such module that I can see.


And I still can't do what I want: to use the target
infrastructure to make a disk image in a file look
like a SCSI device on the local machine. No iSCSI,
SRP, FCxxx, SAS, UAS nor SOP ... just _SCSI_ !!

Doug Gilbert



On 11-09-16 12:09 PM, Douglas Gilbert wrote:
> ping ....
>
> Could some target folks please answer the following question?
>
> I get the same show stopper on lk 3.0.4 :
>
> root@test:/sys/kernel/config# mkdir target
> mkdir: cannot create directory `target': No such file or directory
>
> Doug Gilbert
>
>
> On 11-07-19 11:17 AM, Raju wrote:
>> Hi,
>> I can't able create an iscsi target because of some problem in configfs:
>>
>>
>> Below are the steps I followed in Debian Lenny(upgraded kernel to 2.6.39.2):
>>
>> #!/bin/sh
>> # BEGIN CONFIG FOR CONFIGFS USAGE
>> modprobe configfs
>> mount -t configfs none /sys/kernel/config
>> # END CONFIG FOR CONFIGFS USAGE
>>
>> # BEGIN CONFIGFS CODE FOR GENERIC TARGET ENGINE
>> modprobe target_core_mod
>> export CONFIGFS=/sys/kernel/config/
>> export TARGET=/sys/kernel/config/target/core/
>> export FABRIC=/sys/kernel/config/target/iscsi/
>> # END CONFIGFS CODE FOR GENERIC TARGET ENGINE
>>
>> # START RAMDISK SUBSYSTEM PLUGIN OBJECTS
>> mkdir -p $TARGET/rd_mcp_0/ramdisk
>> echo rd_pages=32768> $TARGET/rd_mcp_0/ramdisk/control
>> echo 1> $TARGET/rd_mcp_0/ramdisk/enable
>> # END RAMDISK SUBSYSTEM PLUGIN OBJECTS
>>
>> # BEGIN CONFIGFS CODE FOR LINUX ISCSI TARGET (LIO-TARGET)
>> DEF_IQN="iqn.2003-01.org.linux-iscsi.target.i686:sn.e475ed6fcdd0"
>> # Define the first iSCSI Network Portal
>> PORTAL1="10.0.0.1:3260"
>> # The first mkdir(2) to $FABRIC will load iscsi_target_mod
>> mkdir -p "$FABRIC/$DEF_IQN/tpgt_1/np/$PORTAL1"
>> mkdir: cannot create directory `/sys/kernel/config/target/iscsi':
>> Invalid argument
>>
>>
>> AND KERNEL LOG:
>>
>> [10443.799266] CORE_HBA[0] - TCM Ramdisk HBA Driver v4.0 on Generic
>> Target CoreStack v4.0.0-rc7-ml
>> [10443.799272] CORE_HBA[0] - Attached Ramdisk HBA: 0 to Generic Target
>> Core TCQDepth: 256 MaxSectors: 1024
>> [10443.799278] CORE_HBA[1] - Attached HBA to Generic Target Core
>> [10443.799329] Target_Core_ConfigFS: Allocated struct se_subsystem_dev:
>> f4ee1000se_dev_su_ptr: f4e3e2c0
>> [10443.800370] Missing rd_pages= parameter
>> [10443.805761] Target_Core_ConfigFS: REGISTER-> group:f8552220 name:iscsi
>> [10443.838505] target_core_get_fabric() failed for iscsi
>> [10443.841826] Target_Core_ConfigFS: REGISTER-> group:f8552220 name:iscsi
>> [10443.875313] target_core_get_fabric() failed for iscsi
>> [10443.878496] Target_Core_ConfigFS: REGISTER-> group:f8552220 name:iscsi
>> [10443.910039] target_core_get_fabric() failed for iscsi
>> [10443.921684] Target_Core_ConfigFS: REGISTER-> group:f8552220 name:iscsi
>> [10443.951926] target_core_get_fabric() failed for iscsi
>>
>>
>>
>> Please suggest any idea,
>>
>>
>> Thanks,
>> Raju.
>
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Re: mkdir: cannot create directory `/sys/kernel/config/target/iscsi': Invalid argument

[Nicholas A. Bellinger]

On Fri, 2011-09-16 at 13:05 -0400, Douglas Gilbert wrote:
> Well I can answer my own question.
> configfs doesn't seem to be mounted at /sys/kernel/config
> and even when it is, superuser cannot create a directory
> there. So mount configfs somewhere else:
> 
> mount -t configfs none /tmp/config

This should actually be:

mount -t configfs configfs /sys/kernel/config

> 
> Then in reference to this page:
>    http://linux-iscsi.org/wiki/Target/configFS
> 
> change this line:
>    export TARGET=/sys/kernel/config/target/core/
> to
>    export TARGET=/tmp/config/target/core/
> then continue.
> 
> BTW The target infrastructure creates this noise in the log:
>    "Unable to load target_core_stgt"
> There is no such module that I can see.
> 
> 
> And I still can't do what I want: to use the target
> infrastructure to make a disk image in a file look
> like a SCSI device on the local machine. No iSCSI,
> SRP, FCxxx, SAS, UAS nor SOP ... just _SCSI_ !!
> 

I just sent an email off-list with the various wiki pointers to tcm_loop
for local SCSI LLD device access.

Using the rtsadmin shell is definately the easiest way to configure
target core backends and tcm_loop target ports.  Installing this from
www.risingtidesystems.com/git source is still a bit challenging atm, but
we'd be happy to send you an rtsadmin-frozen build offlist for your own
use.  Please let us know if you prefer rpm or debs.  ;)

--nab

Re: mkdir: cannot create directory `/sys/kernel/config/target/iscsi': Invalid argument

[James Bottomley]

On Fri, 2011-09-16 at 12:29 -0700, Nicholas A. Bellinger wrote:
> On Fri, 2011-09-16 at 13:05 -0400, Douglas Gilbert wrote:
> > Well I can answer my own question.
> > configfs doesn't seem to be mounted at /sys/kernel/config
> > and even when it is, superuser cannot create a directory
> > there. So mount configfs somewhere else:
> > 
> > mount -t configfs none /tmp/config
> 
> This should actually be:
> 
> mount -t configfs configfs /sys/kernel/config

Well, not really; they're both equally valid.  For pseudo mounts which
have no underlying device, the standard

mount -t <type> <device> <mount point>

Convention has 'none' as the <device> because <device> is just ignored
by the kernel.  The only reason for not choosing 'none' is that the
error messages tend to use the <device> (which does go into the mtab),
so if you later try to umount and something is using the mount point you
can get a funny looking error message

none busy

However, most versions of umount have been fixed to report the <mount
point> instead, so even this potential issue is moot.

James