linux-kernel - Re: [PATCH 7/8] erofs: adapt folios for z_erofs

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Message-ID: <4994e087-47cc-6b32-1daf-abf7026bdca4@kernel.org>
Date:   Wed, 23 Aug 2023 23:22:59 +0800
From:   Chao Yu <chao@...nel.org>
To:     Gao Xiang <hsiangkao@...ux.alibaba.com>,
        linux-erofs@...ts.ozlabs.org
Cc:     LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 7/8] erofs: adapt folios for z_erofs_readahead()

On 2023/8/17 16:28, Gao Xiang wrote:
> It's a straight-forward conversion except that readahead_folio()
> will do folio_put() in advance but it doesn't matter since folios
> are still locked.
> 
> As before, since file-backed folios (pages for now) are locked, so
> we could temporarily use folio->private as an internal counter to
> indicate split parts of each folio for the corresponding pclusters
> to decompress.
> 
> When such counter becomes zero, the folio will be finally unlocked
> (see compress.h and z_erofs_onlinepage_endio()).
> 
> Signed-off-by: Gao Xiang <hsiangkao@...ux.alibaba.com>

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

Thanks,