From: Matthew Wilcox <willy@infradead.org>
To: Yang Shi <shy828301@gmail.com>
Cc: Hugh Dickins <hughd@google.com>,
cfijalkovich@google.com, song@kernel.org,
Andrew Morton <akpm@linux-foundation.org>,
Hao Sun <sunhao.th@gmail.com>, Linux MM <linux-mm@kvack.org>,
Linux FS-devel Mailing List <linux-fsdevel@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Song Liu <songliubraving@fb.com>
Subject: Re: [PATCH] fs: buffer: check huge page size instead of single page for invalidatepage
Date: Sun, 19 Sep 2021 15:40:30 +0100 [thread overview]
Message-ID: <YUdL3lFLFHzC80Wt@casper.infradead.org> (raw)
In-Reply-To: <CAHbLzkqmooOJ0A6JmGD+y5w_BcFtSAJtKBXpXxYNcYrzbpCrNQ@mail.gmail.com>
On Fri, Sep 17, 2021 at 05:07:03PM -0700, Yang Shi wrote:
> > The debugging showed the page passed to invalidatepage is a huge page
> > and the length is the size of huge page instead of single page due to
> > read only FS THP support. But block_invalidatepage() would throw BUG if
> > the size is greater than single page.
Things have already gone wrong before we get to this point. See
do_dentry_open(). You aren't supposed to be able to get a writable file
descriptor on a file which has had huge pages added to the page cache
without the filesystem's knowledge. That's the problem that needs to
be fixed.
next prev parent reply other threads:[~2021-09-19 14:41 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-17 20:57 [PATCH] fs: buffer: check huge page size instead of single page for invalidatepage Yang Shi
2021-09-18 0:07 ` Yang Shi
2021-09-19 14:40 ` Matthew Wilcox [this message]
2021-09-20 21:23 ` Yang Shi
2021-09-20 21:50 ` Matthew Wilcox
2021-09-20 22:35 ` Yang Shi
2021-10-11 19:57 ` Yang Shi
2021-10-20 23:38 ` Yang Shi
2021-10-20 23:49 ` Matthew Wilcox
2021-10-21 0:24 ` Yang Shi
2021-10-21 1:36 ` Matthew Wilcox
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