linux-ext4 - Re: xfstest generic/018 and ext4 defrag

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Date:	Thu, 13 Nov 2014 15:36:13 -0600
From:	Eric Sandeen <sandeen@...hat.com>
To:	Steve French <smfrench@...il.com>,
	linux-fsdevel <linux-fsdevel@...r.kernel.org>,
	"linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>
Subject: Re: xfstest generic/018 and ext4 defrag

On 11/13/14 3:16 PM, Steve French wrote:
> I see an earlier thread about ext4 defrag problems causing this
> failure on xfstest generic/018 running on ext4
> 
> generic/018 1s ... [failed, exit status 1] - output mismatch (see
> /home/sfrench/xfstests/results//generic/018.out.bad)
>     --- tests/generic/018.out 2014-11-13 11:20:05.385406288 -0800
>     +++ /home/sfrench/xfstests/results//generic/018.out.bad 2014-11-13
> 12:33:19.317806287 -0800
>     @@ -10,10 +10,5 @@
>      After: 1
>      Write backwards sync, but contiguous - should defrag to 1 extent
>      Before: 10
>     -After: 1
>     -Write backwards sync leaving holes - defrag should do nothing
>     -Before: 16
>     -After: 16
>     ...
> 
> but wasn't clear whether it was fixed upstream.  It failed on two out
> of three runs for me on most current ext4.  My test is on most current
> Ubuntu x86_64  (and with 3.18-rc3 kernel)
> I couldn't find version info for e4defrag from the command line but
> other ext4 tools are reasonably recent it seems as Ubuntu packages
> them e.g. EXT2FS Library version 1.42.10, 18-May-2014
> 
> Is generic xfstest 18 still broken on ext4?

Did you try upstream?

When I test upstream, it passes.  Because:

# git log --oneline v1.42.10.. misc/e4defrag.c 
c7c539e e4defrag: backwards-allocated files should be defragmented too
47fee2e e2fsprogs: introduce ext2fs_close_free() helper

So no, it is not still broken.

> Also am curious about test generic/026
> 
> generic/026  [not run] ext4 does not define maximum ACL count
> 
> Is that expected?

in common/attr:

# filesystems that want to test maximum supported acl counts need to
# add support in here
_acl_get_max()
...

Because ext4 has not added support there, yes, it is expected that it
will not run.  ;)

I don't honestly know if ext4 has an upper limit on acls.

-Eric

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