Re: Does btrfs get nlink on directories wrong? -- was Re: [PATCH 2/4] xfstests: Add first statx test [ver #5]

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On Wed, Apr 05, 2017 at 11:53:41AM +0100, David Howells wrote:
> I've added a test to xfstests that exercises the new statx syscall.  However,
> it fails on btrfs:
> 
>      Test statx on a directory
>     +[!] stx_nlink differs, 1 != 2
>     +Failed
>     +stat_test failed
> 
> because a new directory it creates has an nlink of 1, not 2.  Is this a case
> of my making an incorrect assumption or is it an fs bug?

Afaik nlink == 1 means that there's no accounting of subdirectories, and
it's a valid value. The 'find' utility can use nlink to optimize
directory traversal but otherwise I'm not aware of other usage.

All directories in btrfs have nlink == 1.
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