Re: [ndctl PATCH] ndctl, test: kill usage of fallocate in firmware-update.sh

[Ross Zwisler]

On Fri, Feb 23, 2018 at 01:45:40PM -0800, Dan Williams wrote:
> On Fri, Feb 23, 2018 at 12:58 PM, Ross Zwisler
>  wrote:
> > On Thu, Feb 22, 2018 at 10:59:22PM -0800, Dan Williams wrote:
> >> The 'fallocate -l 196608 $image' step in the test fails when $image is
> >> on an NFS mount. Use dd instead to create a sparse file. We do not need
> >> to allocate anything since we are only writing zeros.
> >>
> >> Cc: Dave Jiang 
> >> Signed-off-by: Dan Williams 
> >> ---
> >>  test/firmware-update.sh |2 +-
> >>  1 file changed, 1 insertion(+), 1 deletion(-)
> >>
> >> diff --git a/test/firmware-update.sh b/test/firmware-update.sh
> >> index 0d5bcdb3cc42..173647218c28 100755
> >> --- a/test/firmware-update.sh
> >> +++ b/test/firmware-update.sh
> >> @@ -49,7 +49,7 @@ detect()
> >>
> >>  do_tests()
> >>  {
> >> - fallocate -l 196608 $image
> >> + dd if=/dev/zero of=$image bs=1 count=1 skip=196607
> >>   $ndctl update-firmware -d $dev -f $image
> >>  }
> >
> > Hmm, I'm not seeing this failure in my NFS based setup.  Out of curiosity, 
> > do
> > you know why it's failing?  Some difference in our NFS configs?
> 
> Probably, here are my mount options:
> 
> root on / type nfs4
> (rw,relatime,vers=4.0,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,clientaddr=192.168.100.127,local_lock=none,addr=192.168.100.1)
> 
> > Anyway, this seems fine, but
> >
> > fallocate -l 196608 $image
> >
> > does the same thing and seems a little simpler, IMO.
> 
> Not simpler if it randomly fails depending on the filesystem, and
> there is no need to allocate that space since we're just creating a
> file full of zeros.

sorry, I meant "truncate -s 196608 $image".

Anyway, this is fine with either dd or truncate.   I agree that not actually
reserving filesystem space is a win.

Reviewed-by: Ross Zwisler 
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Re: [ndctl PATCH] ndctl, test: kill usage of fallocate in firmware-update.sh

[Dan Williams]

On Fri, Feb 23, 2018 at 12:58 PM, Ross Zwisler
 wrote:
> On Thu, Feb 22, 2018 at 10:59:22PM -0800, Dan Williams wrote:
>> The 'fallocate -l 196608 $image' step in the test fails when $image is
>> on an NFS mount. Use dd instead to create a sparse file. We do not need
>> to allocate anything since we are only writing zeros.
>>
>> Cc: Dave Jiang 
>> Signed-off-by: Dan Williams 
>> ---
>>  test/firmware-update.sh |2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/test/firmware-update.sh b/test/firmware-update.sh
>> index 0d5bcdb3cc42..173647218c28 100755
>> --- a/test/firmware-update.sh
>> +++ b/test/firmware-update.sh
>> @@ -49,7 +49,7 @@ detect()
>>
>>  do_tests()
>>  {
>> - fallocate -l 196608 $image
>> + dd if=/dev/zero of=$image bs=1 count=1 skip=196607
>>   $ndctl update-firmware -d $dev -f $image
>>  }
>
> Hmm, I'm not seeing this failure in my NFS based setup.  Out of curiosity, do
> you know why it's failing?  Some difference in our NFS configs?

Probably, here are my mount options:

root on / type nfs4
(rw,relatime,vers=4.0,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,clientaddr=192.168.100.127,local_lock=none,addr=192.168.100.1)

> Anyway, this seems fine, but
>
> fallocate -l 196608 $image
>
> does the same thing and seems a little simpler, IMO.

Not simpler if it randomly fails depending on the filesystem, and
there is no need to allocate that space since we're just creating a
file full of zeros.
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Re: [ndctl PATCH] ndctl, test: kill usage of fallocate in firmware-update.sh

[Ross Zwisler]

On Thu, Feb 22, 2018 at 10:59:22PM -0800, Dan Williams wrote:
> The 'fallocate -l 196608 $image' step in the test fails when $image is
> on an NFS mount. Use dd instead to create a sparse file. We do not need
> to allocate anything since we are only writing zeros.
> 
> Cc: Dave Jiang 
> Signed-off-by: Dan Williams 
> ---
>  test/firmware-update.sh |2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/test/firmware-update.sh b/test/firmware-update.sh
> index 0d5bcdb3cc42..173647218c28 100755
> --- a/test/firmware-update.sh
> +++ b/test/firmware-update.sh
> @@ -49,7 +49,7 @@ detect()
>  
>  do_tests()
>  {
> - fallocate -l 196608 $image
> + dd if=/dev/zero of=$image bs=1 count=1 skip=196607
>   $ndctl update-firmware -d $dev -f $image
>  }

Hmm, I'm not seeing this failure in my NFS based setup.  Out of curiosity, do
you know why it's failing?  Some difference in our NFS configs?

Anyway, this seems fine, but 

fallocate -l 196608 $image

does the same thing and seems a little simpler, IMO.

- Ross
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