Re: [PATCH 0/3] iotests: Fix 125

[Max Reitz <mreitz@redhat.com>]

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On 25.09.19 20:32, Max Reitz wrote:
> Hi,
> 
> iotest 125 is very broken.  It uses qemu-img info’s “disk size” to
> determine an image’s on-disk size, but it does so in a wrong way: It
> just fetches the first number ([0-9]+), but that isn’t very useful
> because qemu-img info emits human-readable values that include units and
> decimal points.
> 
> We should ust stat -c %b instead.  That’s done in patch 3.
> Unfortunately, doing so exposed more problems.
> 
> Patch 1 fixes a stupid bug in the test itself that we never noticed
> because of what patch 3 fixes.  (Pull patch 3 before patch 1 and you’ll
> see.)
> 
> The other thing is actually a bug in XFS.  Its fallocate()
> implementation rounds up the length independently of the offset, so if
> you try to fallocate an unaligned range, chances are that it might not
> allocate the last block your range touches.  Patch 2 detects that case
> and skips the test then.  (Pull patch 3 before patch 2 and you’ll see
> the test fail on XFS.)
> 
> 
> Max Reitz (3):
>   iotests: Fix 125 for growth_mode = metadata
>   iotests: Disable 125 on broken XFS versions
>   iotests: Use stat -c %b in 125
> 
>  tests/qemu-iotests/125 | 45 +++++++++++++++++++++++++++++++++++++++---
>  1 file changed, 42 insertions(+), 3 deletions(-)

Thanks for the review, applied to my block branch:

https://git.xanclic.moe/XanClic/qemu/commits/branch/block


And for the record, I’ve sent a patch to the XFS driver:

https://www.spinics.net/lists/linux-xfs/msg32174.html

Max


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