linux-ext4 - [Bug 196405] mkdir mishandles st_nlink in ext4 directory with 64997 subdirectories

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Message-ID: <bug-196405-13602-nFjg3kP9ne@https.bugzilla.kernel.org/>
Date:   Tue, 18 Jul 2017 21:07:37 +0000
From:   bugzilla-daemon@...zilla.kernel.org
To:     linux-ext4@...nel.org
Subject: [Bug 196405] mkdir mishandles st_nlink in ext4 directory with 64997
 subdirectories

https://bugzilla.kernel.org/show_bug.cgi?id=196405

--- Comment #2 from michelbach94@...il.com ---
Thank you, Ted.

Is it necessary for it to "break" (quotes because 1 seems to be a kind-of
wildcard) at such a low and weird value?

This behavior doesn't occur with ext4 ram disks. Run the same command, possibly
with an even higher number, but within an ext4 ram disk, created via

    $ sudo mount -t ramfs -o size=4G ext4 <path>

Example output:

    $ ll
    total 4
    drwxr-xr-x      3 christoph root         0 Jul 18 22:59 ./
    drwxrwxrwt     18 root      root      4096 Jul 18 23:00 ../
    drwxrwxr-x 446639 christoph christoph    0 Jul 18 23:05 d/

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