From: Matthew Wilcox <willy@infradead.org>
To: Miaohe Lin <linmiaohe@huawei.com>
Cc: Linux FS-devel Mailing List <linux-fsdevel@vger.kernel.org>,
Linux-MM <linux-mm@kvack.org>
Subject: Re: [PATCH 02/10] mm/truncate: Inline invalidate_complete_page() into its one caller
Date: Tue, 15 Feb 2022 20:09:37 +0000 [thread overview]
Message-ID: <YgwIgUIeWyOVeORI@casper.infradead.org> (raw)
In-Reply-To: <71259221-bc5a-24d0-d7b9-46781d71473a@huawei.com>
On Tue, Feb 15, 2022 at 03:45:34PM +0800, Miaohe Lin wrote:
> > @@ -309,7 +288,10 @@ int invalidate_inode_page(struct page *page)
> > return 0;
> > if (page_mapped(page))
> > return 0;
> > - return invalidate_complete_page(mapping, page);
>
> It seems the checking of page->mapping != mapping is removed here.
> IIUC, this would cause possibly unexpected side effect because
> swapcache page can be invalidate now. I think this function is
> not intended to deal with swapcache though it could do this.
You're right that it might now pass instead of being skipped.
But it's not currently called for swapcache pages. If we did want
to prohibit swapcache pages explicitly, I'd rather we checked the
flag instead of relying on page->mapping != page_mapping(page).
The intent of that check was "has it been truncated", not "is it
swapcache".
next prev parent reply other threads:[~2022-02-15 20:09 UTC|newest]
Thread overview: 42+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-02-14 20:00 [PATCH 00/10] Various fixes around invalidate_page() Matthew Wilcox (Oracle)
2022-02-14 20:00 ` [PATCH 01/10] splice: Use a folio in page_cache_pipe_buf_try_steal() Matthew Wilcox (Oracle)
2022-02-15 7:15 ` Christoph Hellwig
2022-02-15 8:32 ` Miaohe Lin
2022-02-14 20:00 ` [PATCH 02/10] mm/truncate: Inline invalidate_complete_page() into its one caller Matthew Wilcox (Oracle)
2022-02-14 23:09 ` John Hubbard
2022-02-14 23:32 ` Matthew Wilcox
2022-02-14 23:51 ` John Hubbard
2022-02-15 7:17 ` Christoph Hellwig
2022-02-15 7:45 ` Miaohe Lin
2022-02-15 20:09 ` Matthew Wilcox [this message]
2022-02-16 2:36 ` Miaohe Lin
2022-02-16 2:45 ` Miaohe Lin
2022-02-14 20:00 ` [PATCH 03/10] mm/truncate: Convert invalidate_inode_page() to use a folio Matthew Wilcox (Oracle)
2022-02-15 7:18 ` Christoph Hellwig
2022-02-15 8:32 ` Miaohe Lin
2022-02-14 20:00 ` [PATCH 04/10] mm/truncate: Replace page_mapped() call in invalidate_inode_page() Matthew Wilcox (Oracle)
2022-02-15 7:19 ` Christoph Hellwig
2022-02-15 20:12 ` Matthew Wilcox
2022-02-15 8:32 ` Miaohe Lin
2022-02-25 1:31 ` Matthew Wilcox
2022-02-25 3:27 ` Matthew Wilcox
2022-02-14 20:00 ` [PATCH 05/10] mm: Convert remove_mapping() to take a folio Matthew Wilcox (Oracle)
2022-02-15 7:21 ` Christoph Hellwig
2022-02-15 8:33 ` Miaohe Lin
2022-02-14 20:00 ` [PATCH 06/10] mm/truncate: Split invalidate_inode_page() into mapping_shrink_folio() Matthew Wilcox (Oracle)
2022-02-15 7:23 ` Christoph Hellwig
2022-02-15 9:37 ` Miaohe Lin
2022-02-14 20:00 ` [PATCH 07/10] mm/truncate: Convert __invalidate_mapping_pages() to use a folio Matthew Wilcox (Oracle)
2022-02-15 7:24 ` Christoph Hellwig
2022-02-15 9:37 ` Miaohe Lin
2022-02-14 20:00 ` [PATCH 08/10] mm: Turn deactivate_file_page() into deactivate_file_folio() Matthew Wilcox (Oracle)
2022-02-15 7:25 ` Christoph Hellwig
2022-02-15 8:26 ` Miaohe Lin
2022-02-15 20:33 ` Matthew Wilcox
2022-02-16 2:45 ` Miaohe Lin
2022-02-14 20:00 ` [PATCH 09/10] mm/truncate: Combine invalidate_mapping_pagevec() and __invalidate_mapping_pages() Matthew Wilcox (Oracle)
2022-02-15 7:26 ` Christoph Hellwig
2022-02-15 9:37 ` Miaohe Lin
2022-02-14 20:00 ` [PATCH 10/10] fs: Move many prototypes to pagemap.h Matthew Wilcox (Oracle)
2022-02-15 7:27 ` Christoph Hellwig
2022-02-15 9:38 ` Miaohe Lin
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