linux-ext4 - Re: [PATCH v7 14/24] btrfs: Convert from readpages to readahead

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Message-ID: <20200224215743.GA24044@infradead.org>
Date:   Mon, 24 Feb 2020 13:57:43 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     Christoph Hellwig <hch@...radead.org>,
        Johannes Thumshirn <Johannes.Thumshirn@....com>,
        "linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-btrfs@...r.kernel.org" <linux-btrfs@...r.kernel.org>,
        "linux-erofs@...ts.ozlabs.org" <linux-erofs@...ts.ozlabs.org>,
        "linux-ext4@...r.kernel.org" <linux-ext4@...r.kernel.org>,
        "linux-f2fs-devel@...ts.sourceforge.net" 
        <linux-f2fs-devel@...ts.sourceforge.net>,
        "cluster-devel@...hat.com" <cluster-devel@...hat.com>,
        "ocfs2-devel@....oracle.com" <ocfs2-devel@....oracle.com>,
        "linux-xfs@...r.kernel.org" <linux-xfs@...r.kernel.org>
Subject: Re: [PATCH v7 14/24] btrfs: Convert from readpages to readahead

On Mon, Feb 24, 2020 at 01:54:14PM -0800, Matthew Wilcox wrote:
> > First I think the implicit ARRAY_SIZE in readahead_page_batch is highly
> > dangerous, as it will do the wrong thing when passing a pointer or
> > function argument.
> 
> somebody already thought of that ;-)
> 
> #define ARRAY_SIZE(arr) (sizeof(arr) / sizeof((arr)[0]) + __must_be_array(arr))

Ok.  Still find it pretty weird to design a primary interface that
just works with an array type.