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Groups > linux.debian.bugs.dist > #1135907

Bug#1030252: debvm: debvm-create does not set all default ext4 features

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On 01/02/23 21:45, Helmut Grohne wrote:
> On Wed, Feb 01, 2023 at 06:07:25PM +0100, Gioele Barabucci wrote:
>> debvm-create converts the ext2 filesystem created by mmdebstrap to ext4
>> using the following tune2fs command:
>>
>>      tune2fs ... -O extents,uninit_bg,dir_index,has_journal "$IMAGE"
>>
>> The ext4 filesystem created in this way does not have some of the features
>> that a filesystem created with mkfs.ext4 would have:
>>
>> My (debatable) expectation is that the ext4 filesystem would have at least
>> all features of a standard ext4 filesystem.
> 
> This kinda is right. We could slightly improve this, but in the end we
> want to replace genext2fs with mkfs.ext4 and that depends on it
> supporting tarball input. So do you think we should mess with the
> tune2fs invocation in the interim or is it good enough for now?

Hi,

personally I stumbled upon this problem because my tests require 
`dir_nlink` (more than 65k subdirs per directory) and that feature was 
not enabled. Maybe other people have use-cases that depend on other 
missing features, but I doubt it.

IMO just copying the current set of features is enough as an interim 
solution to this minor (and temporary) problem.

Regards,

--
Gioele Barabucci

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Bug#1030252: debvm: debvm-create does not set all default ext4 features Gioele Barabucci <gioele@svario.it> - 2023-02-01 18:10 +0100
  Bug#1030252: debvm: debvm-create does not set all default ext4 features Helmut Grohne <helmut@subdivi.de> - 2023-02-01 21:50 +0100
    Bug#1030252: debvm: debvm-create does not set all default ext4 features Gioele Barabucci <gioele@svario.it> - 2023-02-01 22:10 +0100
      Bug#1030252: debvm: debvm-create does not set all default ext4 features Helmut Grohne <helmut@subdivi.de> - 2023-02-02 10:10 +0100

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