nvmetcli: Unable to run clear/restore

nvmetcli: Unable to run clear/restore

[Tony Asleson]

While experimenting with nvmetcli I'm unable to run clear or restore.

Using master branch against Fedora 31, 5.5.9-200.fc31.x86_64

# ./nvmetcli clear
Traceback (most recent call last):
  File "./nvmetcli", line 740, in <module>
    main()
  File "./nvmetcli", line 722, in main
    funcs[sys.argv[1]](savefile)
  File "./nvmetcli", line 689, in clear
    nvme.Root().clear_existing()
  File "/root/projects/nvmetcli/nvmet/nvme.py", line 315, in clear_existing
    p.delete()
  File "/root/projects/nvmetcli/nvmet/nvme.py", line 677, in delete
    a.delete()
  File "/root/projects/nvmetcli/nvmet/nvme.py", line 200, in delete
    os.rmdir(self.path)
PermissionError: [Errno 1] Operation not permitted:
'/sys/kernel/config/nvmet/ports/0/ana_groups/1'

# ./nvmetcli restore
No saved config file at None, ok, exiting

I just posted a patch series, with those changes when I repeat the
restore I get

# ./nvmetcli restore
Error processing config file at None, error [Errno 1] Operation not
permitted: '/sys/kernel/config/nvmet/ports/0/ana_groups/1', exiting

Same error when trying to run `make test` eg.

[Errno 1] Operation not permitted:
'/sys/kernel/config/nvmet/ports/0/ana_groups/1'

Do I have a mismatch between kernel and user space here or am I missing
something?

Thanks!
-Tony



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Re: nvmetcli: Unable to run clear/restore

[Tony Asleson]

On 3/20/20 3:50 PM, Tony Asleson wrote:
> While experimenting with nvmetcli I'm unable to run clear or restore.
> 
> Using master branch against Fedora 31, 5.5.9-200.fc31.x86_64
> 
> # ./nvmetcli clear
> Traceback (most recent call last):
>   File "./nvmetcli", line 740, in <module>
>     main()
>   File "./nvmetcli", line 722, in main
>     funcs[sys.argv[1]](savefile)
>   File "./nvmetcli", line 689, in clear
>     nvme.Root().clear_existing()
>   File "/root/projects/nvmetcli/nvmet/nvme.py", line 315, in clear_existing
>     p.delete()
>   File "/root/projects/nvmetcli/nvmet/nvme.py", line 677, in delete
>     a.delete()
>   File "/root/projects/nvmetcli/nvmet/nvme.py", line 200, in delete
>     os.rmdir(self.path)
> PermissionError: [Errno 1] Operation not permitted:
> '/sys/kernel/config/nvmet/ports/0/ana_groups/1'

Apparently if I simply do

# rmdir /sys/kernel/config/nvmet/ports/1

The port and associated ana group gets removed and the usage count for
the kernel module nvmet goes to zero.

Is the bug that we are trying to remove
/sys/kernel/config/nvmet/ports/0/ana_groups/1 in userspace from nvmetcli
which can simply be corrected with

diff --git a/nvmet/nvme.py b/nvmet/nvme.py
index 089bafb..a2565e4 100644
--- a/nvmet/nvme.py
+++ b/nvmet/nvme.py
@@ -686,8 +686,6 @@ class Port(CFSNode):
         self._check_self()
         for s in self.subsystems:
             self.remove_subsystem(s)
-        for a in self.ana_groups:
-            a.delete()


or that we should be able to remove it and can't, thus the issue is in
the kernel?

Thanks,
Tony


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Re: nvmetcli: Unable to run clear/restore

[Sagi Grimberg]

>> While experimenting with nvmetcli I'm unable to run clear or restore.
>>
>> Using master branch against Fedora 31, 5.5.9-200.fc31.x86_64
>>
>> # ./nvmetcli clear
>> Traceback (most recent call last):
>>    File "./nvmetcli", line 740, in <module>
>>      main()
>>    File "./nvmetcli", line 722, in main
>>      funcs[sys.argv[1]](savefile)
>>    File "./nvmetcli", line 689, in clear
>>      nvme.Root().clear_existing()
>>    File "/root/projects/nvmetcli/nvmet/nvme.py", line 315, in clear_existing
>>      p.delete()
>>    File "/root/projects/nvmetcli/nvmet/nvme.py", line 677, in delete
>>      a.delete()
>>    File "/root/projects/nvmetcli/nvmet/nvme.py", line 200, in delete
>>      os.rmdir(self.path)
>> PermissionError: [Errno 1] Operation not permitted:
>> '/sys/kernel/config/nvmet/ports/0/ana_groups/1'
> 
> Apparently if I simply do
> 
> # rmdir /sys/kernel/config/nvmet/ports/1
> 
> The port and associated ana group gets removed and the usage count for
> the kernel module nvmet goes to zero.
> 
> Is the bug that we are trying to remove
> /sys/kernel/config/nvmet/ports/0/ana_groups/1 in userspace from nvmetcli
> which can simply be corrected with
> 
> diff --git a/nvmet/nvme.py b/nvmet/nvme.py
> index 089bafb..a2565e4 100644
> --- a/nvmet/nvme.py
> +++ b/nvmet/nvme.py
> @@ -686,8 +686,6 @@ class Port(CFSNode):
>           self._check_self()
>           for s in self.subsystems:
>               self.remove_subsystem(s)
> -        for a in self.ana_groups:
> -            a.delete()
> 
> 
> or that we should be able to remove it and can't, thus the issue is in
> the kernel?

IIRC that this is an issue that Hannes was aiming to address?

Hannes?

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