linux-ext4 - Re: [PATCH 2/3] mm: Provide address_space operation for filling pages for read

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Date:   Wed, 20 Jan 2021 16:20:01 +0000
From:   Christoph Hellwig <hch@...radead.org>
To:     Jan Kara <jack@...e.cz>
Cc:     linux-fsdevel@...r.kernel.org,
        Matthew Wilcox <willy@...radead.org>,
        linux-ext4@...r.kernel.org
Subject: Re: [PATCH 2/3] mm: Provide address_space operation for filling
 pages for read

On Wed, Jan 20, 2021 at 05:06:10PM +0100, Jan Kara wrote:
> Provide an address_space operation for filling pages needed for read
> into page cache. Filesystems can use this operation to seriealize
> page cache filling with e.g. hole punching properly.

Besides the impending rewrite of the area - having another indirection
here is just horrible for performance.  If we want locking in this area
it should be in core code and common for multiple file systems.