linux-ext4 - Re: Question about dirty data for unlinked files

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Message-ID: <20170329112346.GB18467@quack2.suse.cz>
Date:   Wed, 29 Mar 2017 13:23:46 +0200
From:   Jan Kara <jack@...e.cz>
To:     Raymond Jennings <shentino@...il.com>
Cc:     linux-ext4@...r.kernel.org
Subject: Re: Question about dirty data for unlinked files

On Thu 23-03-17 13:07:23, Raymond Jennings wrote:
> If you delete a file (and don't have it open), and there's a bunch of
> dirty data for that file still in page cache, does all that dirty data
> disappear or does it still get written back?

The dirty data just gets discarded when the inode is deleted. In fact if
the file fits in memory (and in dirty_limit), none of the data need to make
it to disk.

								Honza

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