From: "Theodore Y. Ts'o" <tytso@mit.edu>
To: <lsf-pc@lists.linux-foundation.org>
Cc: <linux-fsdevel@vger.kernel.org>, <linux-nvdimm@lists.01.org>
Subject: [LSF/MM TOPIC] Standardizing semantics around the per-file DAX flag
Date: Wed, 13 Feb 2019 11:40:39 -0500 [thread overview]
Message-ID: <20190213164039.GA16285@mit.edu> (raw)
There's been a long-term disagreement about how the per-file DAX flag
should work.
* Should it exist at all?
* What happens when the DAX flag is cleared?
* Should it be not allowed and return an error?
(Or maybe only if the file is otherwise opened anywhere in the system?)
* Should it only takes effect when the file system is unmounted,
or when the inode drops out of the inode cache?
* Should we remove the flag entirely and make it be something the
system automagically infers?
I had hoped consensus would be achieved before the ext4 per-file DAX
flag lands, but it hasn't for a *long* time. Technically the DAX flag
is "experimental", which technically means it could be removed ---
although I suspect at this point, it would break some userspace, so
our options about how to adjust the semantics of the flag are probably
constrained.
- Ted
next reply other threads:[~2019-02-13 16:40 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-02-13 16:40 Theodore Y. Ts'o [this message]
2019-02-19 12:35 ` [LSF/MM TOPIC] Standardizing semantics around the per-file DAX flag Jan Kara
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