Re: Cannot mount ubifs partition

Re: Cannot mount ubifs partition

[Michael Niarchos]

On 13-May-15 06:05, Brian Norris wrote:
> On Tue, May 12, 2015 at 10:38:31PM +0300, Michael N wrote:
>> I am using a Zynq7000 with NAND 512MB and I am trying to deploy Linux on NAND
>> memory. I use a custom built kernel with minimal features (UBI and UBIFS
>> support are enabled and mtd-utils installed). I can ubiformat an mtd
>> partition, I
>> can ubiattach and ubidetach it but whenever I try to mount the
>> partition I get this error.
>>
>>             mount: mounting /dev/ubi0:ubi-rootfs on /mnt/ubifs failed:
>> No such device
> What's the exact mount command you're running? Did you take a look at
> the MTD FAQ?
>
> http://linux-mtd.infradead.org/faq/ubifs.html#L_mount_ubif

I am running this command:

$ mount -t ubifs ubi0:ubi-rootfs /mnt/ubifs

>> (ubi-rootfs is the name of the partition, I am sure about it)
> Brian
>

Re: Cannot mount ubifs partition

[Richard Weinberger]

On Wed, May 13, 2015 at 8:25 AM, Michael Niarchos
<michael.niarchos@gmail.com> wrote:
> On 13-May-15 06:05, Brian Norris wrote:
>>
>> On Tue, May 12, 2015 at 10:38:31PM +0300, Michael N wrote:
>>>
>>> I am using a Zynq7000 with NAND 512MB and I am trying to deploy Linux on
>>> NAND
>>> memory. I use a custom built kernel with minimal features (UBI and UBIFS
>>> support are enabled and mtd-utils installed). I can ubiformat an mtd
>>> partition, I
>>> can ubiattach and ubidetach it but whenever I try to mount the
>>> partition I get this error.
>>>
>>>             mount: mounting /dev/ubi0:ubi-rootfs on /mnt/ubifs failed:
>>> No such device
>>
>> What's the exact mount command you're running? Did you take a look at
>> the MTD FAQ?
>>
>> http://linux-mtd.infradead.org/faq/ubifs.html#L_mount_ubif
>
>
> I am running this command:
>
> $ mount -t ubifs ubi0:ubi-rootfs /mnt/ubifs

Does it work if you use the device node? i.e. /dev/ubi0_X?
Is it attached?

-- 
Thanks,
//richard

Re: Cannot mount ubifs partition

[Michael Niarchos]

On 05/13/2015 09:49 AM, Richard Weinberger wrote:
> On Wed, May 13, 2015 at 8:25 AM, Michael Niarchos
> <michael.niarchos@gmail.com> wrote:
>> On 13-May-15 06:05, Brian Norris wrote:
>>>
>>> On Tue, May 12, 2015 at 10:38:31PM +0300, Michael N wrote:
>>>>
>>>> I am using a Zynq7000 with NAND 512MB and I am trying to deploy Linux on
>>>> NAND
>>>> memory. I use a custom built kernel with minimal features (UBI and UBIFS
>>>> support are enabled and mtd-utils installed). I can ubiformat an mtd
>>>> partition, I
>>>> can ubiattach and ubidetach it but whenever I try to mount the
>>>> partition I get this error.
>>>>
>>>>              mount: mounting /dev/ubi0:ubi-rootfs on /mnt/ubifs failed:
>>>> No such device
>>>
>>> What's the exact mount command you're running? Did you take a look at
>>> the MTD FAQ?
>>>
>>> http://linux-mtd.infradead.org/faq/ubifs.html#L_mount_ubif
>>
>>
>> I am running this command:
>>
>> $ mount -t ubifs ubi0:ubi-rootfs /mnt/ubifs
>
> Does it work if you use the device node? i.e. /dev/ubi0_X?
> Is it attached?

root@zx3-pm3-zynq7:~# ubiattach /dev/ubi_ctrl -m 2
[  115.549805] UBI: attaching mtd2 to ubi0
[  115.787102] mmc0: Card removed during transfer!
[  115.791560] mmc0: Resetting controller.
[  115.803396] mmc0: Card removed during transfer!
[  115.807853] mmc0: Resetting controller.
[  119.024116] UBI: scanning is finished
[  119.056419] UBI: attached mtd2 (name "nand-rootfs", size 506 MiB) to ubi0
[  119.063272] UBI: PEB size: 131072 bytes (128 KiB), LEB size: 126976 bytes
[  119.070053] UBI: min./max. I/O unit sizes: 2048/2048, sub-page size 2048
[  119.076670] UBI: VID header offset: 2048 (aligned 2048), data offset: 
4096
[  119.083579] UBI: good PEBs: 4044, bad PEBs: 4, corrupted PEBs: 0
[  119.089580] UBI: user volume: 1, internal volumes: 1, max. volumes 
count: 128
[  119.096636] UBI: max/mean erase counter: 6/2, WL threshold: 4096, 
image sequence number: 1208887967
[  119.105709] UBI: available PEBs: 0, total reserved PEBs: 4044, PEBs 
reserved for bad PEB handling: 76
[  119.115500] UBI: background thread "ubi_bgt0d" started, PID 933
UBI device number 0, total 4044 LEBs (513490944 bytes, 489.7 MiB), 
available 0 LEBs (0 bytes), LEB size 126976 bytes (124.0 KiB)
root@zx3-pm3-zynq7:~# mount -t ubifs /dev/ubi0_0 /mnt/
mount: mounting /dev/ubi0_0 on /mnt/ failed: No such device

Re: Cannot mount ubifs partition

[Richard Weinberger]

Am 13.05.2015 um 10:48 schrieb Michael Niarchos:
> 
> 
> On 05/13/2015 09:49 AM, Richard Weinberger wrote:
>> On Wed, May 13, 2015 at 8:25 AM, Michael Niarchos
>> <michael.niarchos@gmail.com> wrote:
>>> On 13-May-15 06:05, Brian Norris wrote:
>>>>
>>>> On Tue, May 12, 2015 at 10:38:31PM +0300, Michael N wrote:
>>>>>
>>>>> I am using a Zynq7000 with NAND 512MB and I am trying to deploy Linux on
>>>>> NAND
>>>>> memory. I use a custom built kernel with minimal features (UBI and UBIFS
>>>>> support are enabled and mtd-utils installed). I can ubiformat an mtd
>>>>> partition, I
>>>>> can ubiattach and ubidetach it but whenever I try to mount the
>>>>> partition I get this error.
>>>>>
>>>>>              mount: mounting /dev/ubi0:ubi-rootfs on /mnt/ubifs failed:
>>>>> No such device
>>>>
>>>> What's the exact mount command you're running? Did you take a look at
>>>> the MTD FAQ?
>>>>
>>>> http://linux-mtd.infradead.org/faq/ubifs.html#L_mount_ubif
>>>
>>>
>>> I am running this command:
>>>
>>> $ mount -t ubifs ubi0:ubi-rootfs /mnt/ubifs
>>
>> Does it work if you use the device node? i.e. /dev/ubi0_X?
>> Is it attached?
> 
> root@zx3-pm3-zynq7:~# ubiattach /dev/ubi_ctrl -m 2
> [  115.549805] UBI: attaching mtd2 to ubi0
> [  115.787102] mmc0: Card removed during transfer!
> [  115.791560] mmc0: Resetting controller.
> [  115.803396] mmc0: Card removed during transfer!
> [  115.807853] mmc0: Resetting controller.
> [  119.024116] UBI: scanning is finished
> [  119.056419] UBI: attached mtd2 (name "nand-rootfs", size 506 MiB) to ubi0
> [  119.063272] UBI: PEB size: 131072 bytes (128 KiB), LEB size: 126976 bytes
> [  119.070053] UBI: min./max. I/O unit sizes: 2048/2048, sub-page size 2048
> [  119.076670] UBI: VID header offset: 2048 (aligned 2048), data offset: 4096
> [  119.083579] UBI: good PEBs: 4044, bad PEBs: 4, corrupted PEBs: 0
> [  119.089580] UBI: user volume: 1, internal volumes: 1, max. volumes count: 128
> [  119.096636] UBI: max/mean erase counter: 6/2, WL threshold: 4096, image sequence number: 1208887967
> [  119.105709] UBI: available PEBs: 0, total reserved PEBs: 4044, PEBs reserved for bad PEB handling: 76
> [  119.115500] UBI: background thread "ubi_bgt0d" started, PID 933
> UBI device number 0, total 4044 LEBs (513490944 bytes, 489.7 MiB), available 0 LEBs (0 bytes), LEB size 126976 bytes (124.0 KiB)
> root@zx3-pm3-zynq7:~# mount -t ubifs /dev/ubi0_0 /mnt/
> mount: mounting /dev/ubi0_0 on /mnt/ failed: No such device

Ahh, -m 2...
What does ubinfo -a print?

Thanks,
//richard

Re: Cannot mount ubifs partition

[Michael Niarchos]

On 05/13/2015 11:50 AM, Richard Weinberger wrote:
> Am 13.05.2015 um 10:48 schrieb Michael Niarchos:
>>
>>
>> On 05/13/2015 09:49 AM, Richard Weinberger wrote:
>>> On Wed, May 13, 2015 at 8:25 AM, Michael Niarchos
>>> <michael.niarchos@gmail.com> wrote:
>>>> On 13-May-15 06:05, Brian Norris wrote:
>>>>>
>>>>> On Tue, May 12, 2015 at 10:38:31PM +0300, Michael N wrote:
>>>>>>
>>>>>> I am using a Zynq7000 with NAND 512MB and I am trying to deploy Linux on
>>>>>> NAND
>>>>>> memory. I use a custom built kernel with minimal features (UBI and UBIFS
>>>>>> support are enabled and mtd-utils installed). I can ubiformat an mtd
>>>>>> partition, I
>>>>>> can ubiattach and ubidetach it but whenever I try to mount the
>>>>>> partition I get this error.
>>>>>>
>>>>>>               mount: mounting /dev/ubi0:ubi-rootfs on /mnt/ubifs failed:
>>>>>> No such device
>>>>>
>>>>> What's the exact mount command you're running? Did you take a look at
>>>>> the MTD FAQ?
>>>>>
>>>>> http://linux-mtd.infradead.org/faq/ubifs.html#L_mount_ubif
>>>>
>>>>
>>>> I am running this command:
>>>>
>>>> $ mount -t ubifs ubi0:ubi-rootfs /mnt/ubifs
>>>
>>> Does it work if you use the device node? i.e. /dev/ubi0_X?
>>> Is it attached?
>>
>> root@zx3-pm3-zynq7:~# ubiattach /dev/ubi_ctrl -m 2
>> [  115.549805] UBI: attaching mtd2 to ubi0
>> [  115.787102] mmc0: Card removed during transfer!
>> [  115.791560] mmc0: Resetting controller.
>> [  115.803396] mmc0: Card removed during transfer!
>> [  115.807853] mmc0: Resetting controller.
>> [  119.024116] UBI: scanning is finished
>> [  119.056419] UBI: attached mtd2 (name "nand-rootfs", size 506 MiB) to ubi0
>> [  119.063272] UBI: PEB size: 131072 bytes (128 KiB), LEB size: 126976 bytes
>> [  119.070053] UBI: min./max. I/O unit sizes: 2048/2048, sub-page size 2048
>> [  119.076670] UBI: VID header offset: 2048 (aligned 2048), data offset: 4096
>> [  119.083579] UBI: good PEBs: 4044, bad PEBs: 4, corrupted PEBs: 0
>> [  119.089580] UBI: user volume: 1, internal volumes: 1, max. volumes count: 128
>> [  119.096636] UBI: max/mean erase counter: 6/2, WL threshold: 4096, image sequence number: 1208887967
>> [  119.105709] UBI: available PEBs: 0, total reserved PEBs: 4044, PEBs reserved for bad PEB handling: 76
>> [  119.115500] UBI: background thread "ubi_bgt0d" started, PID 933
>> UBI device number 0, total 4044 LEBs (513490944 bytes, 489.7 MiB), available 0 LEBs (0 bytes), LEB size 126976 bytes (124.0 KiB)
>> root@zx3-pm3-zynq7:~# mount -t ubifs /dev/ubi0_0 /mnt/
>> mount: mounting /dev/ubi0_0 on /mnt/ failed: No such device
>
> Ahh, -m 2...
> What does ubinfo -a print?
>
> Thanks,
> //richard
>
root@zx3-pm3-zynq7:~# ubinfo -a
UBI version:                    1
Count of UBI devices:           1
UBI control device major/minor: 10:59
Present UBI devices:            ubi0

ubi0
Volumes count:                           1
Logical eraseblock size:                 126976 bytes, 124.0 KiB
Total amount of logical eraseblocks:     4044 (513490944 bytes, 489.7 MiB)
Amount of available logical eraseblocks: 0 (0 bytes)
Maximum count of volumes                 128
Count of bad physical eraseblocks:       4
Count of reserved physical eraseblocks:  76
Current maximum erase counter value:     6
Minimum input/output unit size:          2048 bytes
Character device major/minor:            246:0
Present volumes:                         0

Volume ID:   0 (on ubi0)
Type:        dynamic
Alignment:   1
Size:        3964 LEBs (503332864 bytes, 480.0 MiB)
State:       OK
Name:        ubi-rootfs
Character device major/minor: 246:1

Re: Cannot mount ubifs partition

[Richard Weinberger]

Am 13.05.2015 um 10:56 schrieb Michael Niarchos:
> Volume ID:   0 (on ubi0)
> Type:        dynamic
> Alignment:   1
> Size:        3964 LEBs (503332864 bytes, 480.0 MiB)
> State:       OK
> Name:        ubi-rootfs
> Character device major/minor: 246:1

Is the device node present?

Thanks,
//richard

Re: Cannot mount ubifs partition

[Michael Niarchos]

On 05/13/2015 11:59 AM, Richard Weinberger wrote:
> Am 13.05.2015 um 10:56 schrieb Michael Niarchos:
>> Volume ID:   0 (on ubi0)
>> Type:        dynamic
>> Alignment:   1
>> Size:        3964 LEBs (503332864 bytes, 480.0 MiB)
>> State:       OK
>> Name:        ubi-rootfs
>> Character device major/minor: 246:1
>
> Is the device node present?
>
> Thanks,
> //richard
>
Yes, it is present

root@zx3-pm3-zynq7:~# find /dev -name "ubi*"
/dev/ubi0_0
/dev/ubi0
/dev/ubi_ctrl

Thanks,
Michael

Re: Cannot mount ubifs partition

[Richard Weinberger]

Am 13.05.2015 um 11:06 schrieb Michael Niarchos:
> 
> 
> On 05/13/2015 11:59 AM, Richard Weinberger wrote:
>> Am 13.05.2015 um 10:56 schrieb Michael Niarchos:
>>> Volume ID:   0 (on ubi0)
>>> Type:        dynamic
>>> Alignment:   1
>>> Size:        3964 LEBs (503332864 bytes, 480.0 MiB)
>>> State:       OK
>>> Name:        ubi-rootfs
>>> Character device major/minor: 246:1
>>
>> Is the device node present?
>>
>> Thanks,
>> //richard
>>
> Yes, it is present
> 
> root@zx3-pm3-zynq7:~# find /dev -name "ubi*"
> /dev/ubi0_0
> /dev/ubi0
> /dev/ubi_ctrl

Can you use them using ubiupdatevol, etc...?

Something is fishy here or we're all missing something obvious. :)

Thanks,
//richard

Re: Cannot mount ubifs partition

[Richard Weinberger]

Am 13.05.2015 um 11:06 schrieb Michael Niarchos:
> 
> 
> On 05/13/2015 11:59 AM, Richard Weinberger wrote:
>> Am 13.05.2015 um 10:56 schrieb Michael Niarchos:
>>> Volume ID:   0 (on ubi0)
>>> Type:        dynamic
>>> Alignment:   1
>>> Size:        3964 LEBs (503332864 bytes, 480.0 MiB)
>>> State:       OK
>>> Name:        ubi-rootfs
>>> Character device major/minor: 246:1
>>
>> Is the device node present?
>>
>> Thanks,
>> //richard
>>
> Yes, it is present
> 
> root@zx3-pm3-zynq7:~# find /dev -name "ubi*"
> /dev/ubi0_0
> /dev/ubi0
> /dev/ubi_ctrl

BTW: Have you created the nodes by hand? Do major/minor numbers match?

Thanks,
//richard

Re: Cannot mount ubifs partition

[Michael Niarchos]

On 05/13/2015 12:10 PM, Richard Weinberger wrote:
> Am 13.05.2015 um 11:06 schrieb Michael Niarchos:
>>
>>
>> On 05/13/2015 11:59 AM, Richard Weinberger wrote:
>>> Am 13.05.2015 um 10:56 schrieb Michael Niarchos:
>>>> Volume ID:   0 (on ubi0)
>>>> Type:        dynamic
>>>> Alignment:   1
>>>> Size:        3964 LEBs (503332864 bytes, 480.0 MiB)
>>>> State:       OK
>>>> Name:        ubi-rootfs
>>>> Character device major/minor: 246:1
>>>
>>> Is the device node present?
>>>
>>> Thanks,
>>> //richard
>>>
>> Yes, it is present
>>
>> root@zx3-pm3-zynq7:~# find /dev -name "ubi*"
>> /dev/ubi0_0
>> /dev/ubi0
>> /dev/ubi_ctrl
>
> Can you use them using ubiupdatevol, etc...?
>
> Something is fishy here or we're all missing something obvious. :)
>
> Thanks,
> //richard
>
root@zx3-pm3-zynq7:/var/volatile/tmp# ubiupdatevol /dev/ubi0_0 
/tmp/zx3-image.ubifs
[  272.730913] mmc0: Card removed during transfer!
[  272.735368] mmc0: Resetting controller.

This messages are been printed many times, but no error for
ubi updatevol is returned or something.

I 've been thinking the same thing :)

I don't know if this is going to help but when I first tried to load
root filesystem from NAND, kernel printed that the rootfs variable was
not set right and that the available options are:
mtdblock0
mtdblock1
mtdblock2

I get this when I run

root@zx3-pm3-zynq7:/var/volatile/tmp# cat /proc/partitions
major minor  #blocks  name

   31        0       5120 mtdblock0
   31        1       1024 mtdblock1
   31        2     518144 mtdblock2

Also,

root@zx3-pm3-zynq7:/var/volatile/tmp# cat /proc/mtd
dev:    size   erasesize  name
mtd0: 00500000 00020000 "nand-linux"
mtd1: 00100000 00020000 "nand-device-tree"
mtd2: 1fa00000 00020000 "nand-rootfs"

I don't know what's going on :)

Re: Cannot mount ubifs partition

[Michael Niarchos]

On 05/13/2015 12:20 PM, Richard Weinberger wrote:
> Am 13.05.2015 um 11:06 schrieb Michael Niarchos:
>>
>>
>> On 05/13/2015 11:59 AM, Richard Weinberger wrote:
>>> Am 13.05.2015 um 10:56 schrieb Michael Niarchos:
>>>> Volume ID:   0 (on ubi0)
>>>> Type:        dynamic
>>>> Alignment:   1
>>>> Size:        3964 LEBs (503332864 bytes, 480.0 MiB)
>>>> State:       OK
>>>> Name:        ubi-rootfs
>>>> Character device major/minor: 246:1
>>>
>>> Is the device node present?
>>>
>>> Thanks,
>>> //richard
>>>
>> Yes, it is present
>>
>> root@zx3-pm3-zynq7:~# find /dev -name "ubi*"
>> /dev/ubi0_0
>> /dev/ubi0
>> /dev/ubi_ctrl
>
> BTW: Have you created the nodes by hand? Do major/minor numbers match?
>
No, I have not created the nodes by hand

Re: Cannot mount ubifs partition

[Richard Weinberger]

Am 13.05.2015 um 11:43 schrieb Michael Niarchos:

>> BTW: Have you created the nodes by hand? Do major/minor numbers match?
>>
> No, I have not created the nodes by hand

Please answer all my questions. Also from the other mails.

Thanks,
//richard

Re: Cannot mount ubifs partition

[Michael Niarchos]

On 05/13/2015 01:42 PM, Richard Weinberger wrote:
> Am 13.05.2015 um 12:33 schrieb Michael Niarchos:
>> On 05/13/2015 01:16 PM, Richard Weinberger wrote:
>>> Am 13.05.2015 um 11:43 schrieb Michael Niarchos:
>>>
>>>>> BTW: Have you created the nodes by hand? Do major/minor numbers match?
>>>>>
>>>> No, I have not created the nodes by hand
>>>
>>> Please answer all my questions. Also from the other mails.
>>>
>>> Thanks,
>>> //richard

> Do the minor/major numbers match?

Yes they do match.

$ ls -l /dev/ubi0_0
crw-------    1 root     root      246,   1 May 11 16:19 /dev/ubi0_0

> Does ubiupdatevol succeed?

I run the following command:

$ ubiupdatevol /dev/ubi0_0 /tmp/zx3-image.ubifs

and nothing is printed, so I suppose that it succeeds :)

> If all ubitools work but mounting ubifs not, it is maybe an ubifs issue.
> Is the ubifs module loaded? :)

There is a problem with loading ubifs module (other modules as well)

$ modprobe ubifs
modprobe: module ubifs not found in modules.dep

I think that this is a problem of my minimal built kernel.

Michael

Re: Cannot mount ubifs partition

[Richard Weinberger]

Am 13.05.2015 um 12:58 schrieb Michael Niarchos:
> $ modprobe ubifs
> modprobe: module ubifs not found in modules.dep
> 
> I think that this is a problem of my minimal built kernel.

*gnahhhh*. No ubifs for you.
Thus is why mount is failing...

Thanks,
//richard

Re: Cannot mount ubifs partition

[Michael Niarchos]

On 05/13/2015 01:59 PM, Richard Weinberger wrote:
> Am 13.05.2015 um 12:58 schrieb Michael Niarchos:
>> $ modprobe ubifs
>> modprobe: module ubifs not found in modules.dep
>>
>> I think that this is a problem of my minimal built kernel.
>
I checked my kernel build configuration and it seems that
UBI and UBIFS are built-in in the kernel and should not be
loaded as modules. :S I 'll look it up anyway.

Thanks

Re: Cannot mount ubifs partition

[Sheng Yong]

Hi, folks,

On 5/13/2015 5:20 PM, Richard Weinberger wrote:
> Am 13.05.2015 um 11:06 schrieb Michael Niarchos:
>>
>>
>> On 05/13/2015 11:59 AM, Richard Weinberger wrote:
>>> Am 13.05.2015 um 10:56 schrieb Michael Niarchos:
>>>> Volume ID:   0 (on ubi0)
>>>> Type:        dynamic
>>>> Alignment:   1
>>>> Size:        3964 LEBs (503332864 bytes, 480.0 MiB)
>>>> State:       OK
>>>> Name:        ubi-rootfs
>>>> Character device major/minor: 246:1
>>>
>>> Is the device node present?
>>>
>>> Thanks,
>>> //richard
>>>
>> Yes, it is present
>>
>> root@zx3-pm3-zynq7:~# find /dev -name "ubi*"
>> /dev/ubi0_0
>> /dev/ubi0
>> /dev/ubi_ctrl
> 
> BTW: Have you created the nodes by hand? Do major/minor numbers match?
If we create the dev node by hand, it is hard for kernel to notice that.

UBI (and even driver base) seems doesn't know and doesn't care if device
nodes already exist. UBI just checks the ubi_devices, registers devices,
and tells udev to make node. Although everything seems ok, `mount' will
fail because of wrong device node. However, the "device node" is removed
when detaching without any warning or error message. In this way, UBI
could delete the file without user's permission.

Is this appropriate? Shall we add some code in ubidetach to detect whether
the "device node" to be removed is correct?

thanks,
Sheng

> 
> Thanks,
> //richard
> 
> ______________________________________________________
> Linux MTD discussion mailing list
> http://lists.infradead.org/mailman/listinfo/linux-mtd/
> 
> 

Re: Cannot mount ubifs partition

[Richard Weinberger]

Am 14.05.2015 um 05:45 schrieb Sheng Yong:
> Hi, folks,
> 
> On 5/13/2015 5:20 PM, Richard Weinberger wrote:
>> Am 13.05.2015 um 11:06 schrieb Michael Niarchos:
>>>
>>>
>>> On 05/13/2015 11:59 AM, Richard Weinberger wrote:
>>>> Am 13.05.2015 um 10:56 schrieb Michael Niarchos:
>>>>> Volume ID:   0 (on ubi0)
>>>>> Type:        dynamic
>>>>> Alignment:   1
>>>>> Size:        3964 LEBs (503332864 bytes, 480.0 MiB)
>>>>> State:       OK
>>>>> Name:        ubi-rootfs
>>>>> Character device major/minor: 246:1
>>>>
>>>> Is the device node present?
>>>>
>>>> Thanks,
>>>> //richard
>>>>
>>> Yes, it is present
>>>
>>> root@zx3-pm3-zynq7:~# find /dev -name "ubi*"
>>> /dev/ubi0_0
>>> /dev/ubi0
>>> /dev/ubi_ctrl
>>
>> BTW: Have you created the nodes by hand? Do major/minor numbers match?

Michael's problem was that ubifs was not loaded.
He confirmed that off-list.

> If we create the dev node by hand, it is hard for kernel to notice that.
> 
> UBI (and even driver base) seems doesn't know and doesn't care if device
> nodes already exist. UBI just checks the ubi_devices, registers devices,
> and tells udev to make node. Although everything seems ok, `mount' will
> fail because of wrong device node. However, the "device node" is removed
> when detaching without any warning or error message. In this way, UBI
> could delete the file without user's permission.
> 
> Is this appropriate? Shall we add some code in ubidetach to detect whether
> the "device node" to be removed is correct?

Isn't this the behavior that all device drivers have?
Maybe I miss something as my uptime is less than 15min. ;)

Thanks,
//richard

Re: Cannot mount ubifs partition

[Sheng Yong]

On 5/14/2015 3:58 PM, Richard Weinberger wrote:
> Am 14.05.2015 um 05:45 schrieb Sheng Yong:
>> Hi, folks,
>>
>> On 5/13/2015 5:20 PM, Richard Weinberger wrote:
>>> Am 13.05.2015 um 11:06 schrieb Michael Niarchos:
>>>>
>>>>
>>>> On 05/13/2015 11:59 AM, Richard Weinberger wrote:
>>>>> Am 13.05.2015 um 10:56 schrieb Michael Niarchos:
>>>>>> Volume ID:   0 (on ubi0)
>>>>>> Type:        dynamic
>>>>>> Alignment:   1
>>>>>> Size:        3964 LEBs (503332864 bytes, 480.0 MiB)
>>>>>> State:       OK
>>>>>> Name:        ubi-rootfs
>>>>>> Character device major/minor: 246:1
>>>>>
>>>>> Is the device node present?
>>>>>
>>>>> Thanks,
>>>>> //richard
>>>>>
>>>> Yes, it is present
>>>>
>>>> root@zx3-pm3-zynq7:~# find /dev -name "ubi*"
>>>> /dev/ubi0_0
>>>> /dev/ubi0
>>>> /dev/ubi_ctrl
>>>
>>> BTW: Have you created the nodes by hand? Do major/minor numbers match?
> 
> Michael's problem was that ubifs was not loaded.
> He confirmed that off-list.
> 
>> If we create the dev node by hand, it is hard for kernel to notice that.
>>
>> UBI (and even driver base) seems doesn't know and doesn't care if device
>> nodes already exist. UBI just checks the ubi_devices, registers devices,
>> and tells udev to make node. Although everything seems ok, `mount' will
>> fail because of wrong device node. However, the "device node" is removed
>> when detaching without any warning or error message. In this way, UBI
>> could delete the file without user's permission.
>>
>> Is this appropriate? Shall we add some code in ubidetach to detect whether
>> the "device node" to be removed is correct?
> 
> Isn't this the behavior that all device drivers have?
Yes, I think so. I just considered that is there any point to do something
to avoid this, when I read the mail that you suggest Michael to check the
device node. :-)

thanks,
Sheng

> Maybe I miss something as my uptime is less than 15min. ;)
> 
> Thanks,
> //richard
> 
> ______________________________________________________
> Linux MTD discussion mailing list
> http://lists.infradead.org/mailman/listinfo/linux-mtd/
> 
> 

Re: Cannot mount ubifs partition

[Richard Weinberger]

Am 14.05.2015 um 10:24 schrieb Sheng Yong:
>> Isn't this the behavior that all device drivers have?
> Yes, I think so. I just considered that is there any point to do something
> to avoid this, when I read the mail that you suggest Michael to check the
> device node. :-)

We already have a solution for that, udev and devtmpfs.
If you create the nodes by hand you're on your own.
Sadly some embedded folks still do, that's why I was asking...

Thanks,
//richard

Re: Cannot mount ubifs partition

[Michael Niarchos]

On 13-May-15 04:57, Bean Huo 霍斌斌 (beanhuo) wrote:
> 
>> I am using a Zynq7000 with NAND 512MB and
>> I am trying to deploy Linux on NAND memory.
>> I use a custom built kernel with minimal features
>> (UBI and UBIFS support are enabled and mtd-utils installed).
>> I can ubiformat an mtd partition, I can ubiattach and ubidetach it but whenever
>> I try to mount the partition I get this error.
> 
>             >mount: mounting /dev/ubi0:ubi-rootfs on /mnt/ubifs failed:
>> No such device
> 
>> (ubi-rootfs is the name of the partition, I am sure about it)
> 
>> I am sorry if I am asking about a problem that has been reported before, but I am new to this list
> 
>> Thanks in advance,
>> Michael
> 
> Hi, Michael
> 
> Do you have create a ubi volume ubi-rootfs on this mtd device ?
> 
> ubimkvol /dev/ubi0 -N ubi-rootfs -m
> 

I have created a ubi volume in u-boot with the following commands.

	ubi part nand-rootfs
	ubi create ubi-rootfs

"nand-rootfs is the name of the nand partition"

Re: Cannot mount ubifs partition

[Brian Norris]

On Tue, May 12, 2015 at 10:38:31PM +0300, Michael N wrote:
> I am using a Zynq7000 with NAND 512MB and I am trying to deploy Linux on NAND
> memory. I use a custom built kernel with minimal features (UBI and UBIFS
> support are enabled and mtd-utils installed). I can ubiformat an mtd
> partition, I
> can ubiattach and ubidetach it but whenever I try to mount the
> partition I get this error.
> 
>            mount: mounting /dev/ubi0:ubi-rootfs on /mnt/ubifs failed:
> No such device

What's the exact mount command you're running? Did you take a look at
the MTD FAQ?

http://linux-mtd.infradead.org/faq/ubifs.html#L_mount_ubifs

> (ubi-rootfs is the name of the partition, I am sure about it)

Brian

RE: Cannot mount ubifs partition

[Bean Huo 霍斌斌 (beanhuo)]

>I am using a Zynq7000 with NAND 512MB and
>I am trying to deploy Linux on NAND memory.
>I use a custom built kernel with minimal features 
>(UBI and UBIFS support are enabled and mtd-utils installed). 
>I can ubiformat an mtd partition, I can ubiattach and ubidetach it but whenever
>I try to mount the partition I get this error.

           >mount: mounting /dev/ubi0:ubi-rootfs on /mnt/ubifs failed:
>No such device

>(ubi-rootfs is the name of the partition, I am sure about it)

>I am sorry if I am asking about a problem that has been reported before, but I am new to this list

>Thanks in advance,
>Michael

Hi, Michael 

Do you have create a ubi volume ubi-rootfs on this mtd device ?

ubimkvol /dev/ubi0 -N ubi-rootfs -m

Cannot mount ubifs partition

[Michael N]

I am using a Zynq7000 with NAND 512MB and I am trying to deploy Linux on NAND
memory. I use a custom built kernel with minimal features (UBI and UBIFS
support are enabled and mtd-utils installed). I can ubiformat an mtd
partition, I
can ubiattach and ubidetach it but whenever I try to mount the
partition I get this error.

           mount: mounting /dev/ubi0:ubi-rootfs on /mnt/ubifs failed:
No such device

(ubi-rootfs is the name of the partition, I am sure about it)

I am sorry if I am asking about a problem that has been reported before,
but I am
new to this list

Thanks in advance,
Michael