linux-ext4 - Re: Query about ext4 commit interval vs dirty_expire

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Message-ID: <20191218112220.GA13668@quack2.suse.cz>
Date:   Wed, 18 Dec 2019 12:22:20 +0100
From:   Jan Kara <jack@...e.cz>
To:     Paul Richards <paul.richards@...il.com>
Cc:     Jan Kara <jack@...e.cz>, linux-ext4@...r.kernel.org
Subject: Re: Query about ext4 commit interval vs dirty_expire_centisecs

On Wed 18-12-19 10:35:56, Paul Richards wrote:
> I found it here:
> https://www.kernel.org/doc/Documentation/filesystems/ext4.txt
> 
> I think this might be the source, but I'm not sure:
> https://github.com/torvalds/linux/blame/master/Documentation/admin-guide/ext4.rst#L185-L187

Yes, that's it. Somehow my grep capabilities failed me :-| Thanks for the
pointer.

> While searching for this I also found a copy of the same `commit`
> documentation here:
> https://github.com/torvalds/linux/blob/master/Documentation/filesystems/ocfs2.txt
> I don't know if the same correction should be made for ocfs2 or not.

For OCFS2 it is somewhat different since it doesn't do delayed allocation.
So the text is actually correct for file creation. It is still incorrect
for file overwrites though on which commit interval has no effect.

								Honza
-- 
Jan Kara <jack@...e.com>
SUSE Labs, CR