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

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Message-ID: <bug-196405-13602-wftPX4kXg1@https.bugzilla.kernel.org/>
Date:   Fri, 21 Jul 2017 21:47:03 +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 #21 from Andreas Dilger (adilger.kernelbugzilla@...ger.ca) ---
Michael, as discussed here, I don't think the problem is the number of links,
but rather that fts is "optimizing" the traversal of a directory with a hard
link count of 1 incorrectly.  In your debbugs.gnu.org 27739 bug report this
problem wasn't mentioned at all, only that the link count was set to 1, which
is why I think it was closed as "not a bug".

I would suggest to re-open 27739, or file a new bug that describes the problem
as Paul did in the first comment here, namely that fts is incorrectly
optimizing the traversal of subdirectories when the directory link count is 1,
when it should be treating this as "the subdirectory count is not being
tracked".

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