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Date:   Sat, 02 Feb 2019 04:01:14 +0000
From:   bugzilla-daemon@...zilla.kernel.org
To:     linux-ext4@...r.kernel.org
Subject: [Bug 202485] chmod'ed permission not persisted upon fsync

https://bugzilla.kernel.org/show_bug.cgi?id=202485

Vijay Chidambaram (vijayc@...xas.edu) changed:

           What    |Removed                     |Added
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                 CC|                            |vijayc@...xas.edu

--- Comment #2 from Vijay Chidambaram (vijayc@...xas.edu) ---
Hi Seulbae,

Adding on to what Ted said, the POSIX standards are not very specific about
crash-consistency guarantees. I'd recommend you go through the ext4/btrfs/xfs
mailing lists searching for "Vijay Chidambaram", Jayashree Mohan", or "Ashlie
Martinez" to find prior discussions and other potential dead-ends. The previous
discussions also document the guarantees provided by the widely-used Linux file
systems, so that you know what is a bug and what is not. 

For example, a symlink also does not have crash-consistency guarantees:
https://www.spinics.net/lists/linux-btrfs/msg76816.html

Our OSDI paper has more details:
http://www.cs.utexas.edu/~vijay/papers/osdi18-crashmonkey.pdf

Thanks,
Vijay Chidambaram, UT Austin

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