linux-ext4 - Re: [PATCH 7/7] mm: return an ERR_PTR from __filemap_get

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Date:   Fri, 27 Jan 2023 02:24:29 +0900
From:   Ryusuke Konishi <konishi.ryusuke@...il.com>
To:     Christoph Hellwig <hch@....de>
Cc:     Andrew Morton <akpm@...ux-foundation.org>,
        Matthew Wilcox <willy@...radead.org>,
        Hugh Dickins <hughd@...gle.com>, linux-afs@...ts.infradead.org,
        linux-btrfs@...r.kernel.org, linux-ext4@...r.kernel.org,
        cluster-devel@...hat.com, linux-mm@...ck.org,
        linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-nilfs@...r.kernel.org
Subject: Re: [PATCH 7/7] mm: return an ERR_PTR from __filemap_get_folio

On Sat, Jan 21, 2023 at 3:59 PM Christoph Hellwig wrote:
>
> Instead of returning NULL for all errors, distinguish between:
>
>  - no entry found and not asked to allocated (-ENOENT)
>  - failed to allocate memory (-ENOMEM)
>  - would block (-EAGAIN)
>
> so that callers don't have to guess the error based on the passed
> in flags.
>
> Also pass through the error through the direct callers:
> filemap_get_folio, filemap_lock_folio filemap_grab_folio
> and filemap_get_incore_folio.
>
> Signed-off-by: Christoph Hellwig <hch@....de>
> ---

For

>  fs/nilfs2/page.c         |  6 +++---

Acked-by: Ryusuke Konishi <konishi.ryusuke@...il.com>

Thanks,
Ryusuke Konishi