linux-kernel - Re: [PATCH v2 09/25] fs: Add a filesystem flag for large pages

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Message-ID: <20200212074318.GG7068@infradead.org>
Date:   Tue, 11 Feb 2020 23:43:18 -0800
From:   Christoph Hellwig <hch@...radead.org>
To:     Matthew Wilcox <willy@...radead.org>
Cc:     linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2 09/25] fs: Add a filesystem flag for large pages

On Tue, Feb 11, 2020 at 08:18:29PM -0800, Matthew Wilcox wrote:
> From: "Matthew Wilcox (Oracle)" <willy@...radead.org>
> 
> The page cache needs to know whether the filesystem supports pages >
> PAGE_SIZE.

Does it make sense to set this flag on the file_system_type, which
is rather broad scope, or a specific superblock or even inode?

For some file systems we might require on-disk flags that aren't set
for all instances.