linux-kernel - Re: [f2fs-dev] [PATCH v4 16/23] f2fs: Convert f2fs_sync_meta_pages() to use filemap_get_folios

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Message-ID: <489f2daa-4559-6c32-71e2-8bab65fb8154@kernel.org>
Date:   Sun, 11 Dec 2022 14:03:57 +0800
From:   Chao Yu <chao@...nel.org>
To:     "Vishal Moola (Oracle)" <vishal.moola@...il.com>,
        linux-fsdevel@...r.kernel.org
Cc:     linux-cifs@...r.kernel.org, linux-nilfs@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net, cluster-devel@...hat.com,
        linux-mm@...ck.org, ceph-devel@...r.kernel.org,
        linux-ext4@...r.kernel.org, linux-afs@...ts.infradead.org,
        linux-btrfs@...r.kernel.org
Subject: Re: [f2fs-dev] [PATCH v4 16/23] f2fs: Convert f2fs_sync_meta_pages()
 to use filemap_get_folios_tag()

On 2022/11/3 0:10, Vishal Moola (Oracle) wrote:
> Convert function to use folios throughout. This is in preparation for the
> removal of find_get_pages_range_tag(). This change removes 5 calls to
> compound_head().
> 
> Initially the function was checking if the previous page index is truly the
> previous page i.e. 1 index behind the current page. To convert to folios and
> maintain this check we need to make the check
> folio->index != prev + folio_nr_pages(previous folio) since we don't know
> how many pages are in a folio.
> 
> At index i == 0 the check is guaranteed to succeed, so to workaround indexing
> bounds we can simply ignore the check for that specific index. This makes the
> initial assignment of prev trivial, so I removed that as well.
> 
> Also modified a comment in commit_checkpoint for consistency.
> 
> Signed-off-by: Vishal Moola (Oracle) <vishal.moola@...il.com>

Acked-by: Chao Yu <chao@...nel.org>

Thanks,