linux-kernel - Re: [PATCH v10 2/7] filemap: check compound_head(page)->mapping in pagecache_get

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Message-ID: <20190812203304.GA15498@cmpxchg.org>
Date:   Mon, 12 Aug 2019 16:33:04 -0400
From:   Johannes Weiner <hannes@...xchg.org>
To:     Song Liu <songliubraving@...com>
Cc:     linux-mm@...ck.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, matthew.wilcox@...cle.com,
        kirill.shutemov@...ux.intel.com, kernel-team@...com,
        william.kucharski@...cle.com, akpm@...ux-foundation.org,
        hdanton@...a.com
Subject: Re: [PATCH v10 2/7] filemap: check compound_head(page)->mapping in
 pagecache_get_page()

On Thu, Aug 01, 2019 at 11:42:39AM -0700, Song Liu wrote:
> Similar to previous patch, pagecache_get_page() avoids race condition
> with truncate by checking page->mapping == mapping. This does not work
> for compound pages. This patch let it check compound_head(page)->mapping
> instead.
> 
> Suggested-by: Johannes Weiner <hannes@...xchg.org>
> Signed-off-by: Song Liu <songliubraving@...com>

Acked-by: Johannes Weiner <hannes@...xchg.org>