linux-ext4 - Re: Is ext4_dio_read_iter() broken?

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Message-ID: <1023937.1584010180@warthog.procyon.org.uk>
Date:   Thu, 12 Mar 2020 10:49:40 +0000
From:   David Howells <dhowells@...hat.com>
To:     Christoph Hellwig <hch@....de>
Cc:     dhowells@...hat.com, mbobrowski@...browski.org,
        darrick.wong@...cle.com, jack@...e.cz, linux-ext4@...r.kernel.org,
        linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org
Subject: Re: Is ext4_dio_read_iter() broken? - and xfs_file_dio_aio_read()

Christoph Hellwig <hch@....de> wrote:

> > > at the end of the function - but surely iocb should be expected to have
> > > been freed when iocb->ki_complete() was called?
> 
> The iocb is refcounted and only completed when the refcount hits zero,
> and an extra reference is held until the submission has completed.
> Take a look at iocb_put().

Ah...  This is in struct aio_kiocb and not struct kiocb - that's why I missed
it.  Thanks.

David