linux-kernel - How does ftruncate() interact with DIO read?

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Message-ID: <2116614.1675441630@warthog.procyon.org.uk>
Date:   Fri, 03 Feb 2023 16:27:10 +0000
From:   David Howells <dhowells@...hat.com>
To:     Christoph Hellwig <hch@....de>
Cc:     dhowells@...hat.com, John Hubbard <jhubbard@...dia.com>,
        David Hildenbrand <david@...hat.com>,
        syzbot <syzbot+a440341a59e3b7142895@...kaller.appspotmail.com>,
        linux-kernel@...r.kernel.org, syzkaller-bugs@...glegroups.com
Subject: How does ftruncate() interact with DIO read?

Hi Christoph,

What does ftruncate() do if there's a conflicting DIO read happening on the
same file?  Does it cancel the bio?

David