linux-kernel - Re: [RFC PATCH 03/11] vfs: Use init

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Date:   Fri, 30 Jun 2023 17:00:18 +0100
From:   David Howells <dhowells@...hat.com>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     dhowells@...hat.com, Al Viro <viro@...iv.linux.org.uk>,
        Christoph Hellwig <hch@...radead.org>,
        Matthew Wilcox <willy@...radead.org>, Jan Kara <jack@...e.cz>,
        Jeff Layton <jlayton@...nel.org>,
        David Hildenbrand <david@...hat.com>,
        Jason Gunthorpe <jgg@...dia.com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Hillf Danton <hdanton@...a.com>,
        Christian Brauner <brauner@...nel.org>,
        linux-fsdevel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        Christoph Hellwig <hch@....de>,
        Christian Brauner <christian@...uner.io>
Subject: Re: [RFC PATCH 03/11] vfs: Use init_kiocb() to initialise new IOCBs

Jens Axboe <axboe@...nel.dk> wrote:

> One concern here is that we're using IOCB_WRITE here to tell if
> sb_start_write() has been done or not, and hence whether
> kiocb_end_write() needs to be called. You know set it earlier, which
> means if we get a failure if we need to setup async data, then we know
> have IOCB_WRITE set at that point even though we did not call
> sb_start_write().

Hmmm...  It's set earlier in a number of places anyway - __cachefiles_write()
for example.

Btw, can you please put some comments on the IOCB_* constants?  I have to
guess at what they mean and how they're meant to be used.  Or better still,
get Christoph to write Documentation/core-api/iocb.rst describing the API? ;-)

David