From: Matthew Wilcox <willy@infradead.org>
To: Jens Axboe <axboe@kernel.dk>
Cc: linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
linux-block@vger.kernel.org
Subject: Re: [PATCH 3/5] mm: make buffered writes work with RWF_UNCACHED
Date: Tue, 10 Dec 2019 08:55:32 -0800 [thread overview]
Message-ID: <20191210165532.GJ32169@bombadil.infradead.org> (raw)
In-Reply-To: <20191210162454.8608-4-axboe@kernel.dk>
On Tue, Dec 10, 2019 at 09:24:52AM -0700, Jens Axboe wrote:
> +/*
> + * Start writeback on the pages in pgs[], and then try and remove those pages
> + * from the page cached. Used with RWF_UNCACHED.
> + */
> +void write_drop_cached_pages(struct page **pgs, struct address_space *mapping,
> + unsigned *nr)
It would seem more natural to use a pagevec instead of pgs/nr.
> +{
> + loff_t start, end;
> + int i;
> +
> + end = 0;
> + start = LLONG_MAX;
> + for (i = 0; i < *nr; i++) {
> + struct page *page = pgs[i];
> + loff_t off;
> +
> + off = (loff_t) page_to_index(page) << PAGE_SHIFT;
Isn't that page_offset()?
> + __filemap_fdatawrite_range(mapping, start, end, WB_SYNC_NONE);
> +
> + for (i = 0; i < *nr; i++) {
> + struct page *page = pgs[i];
> +
> + lock_page(page);
> + if (page->mapping == mapping) {
So you're protecting against the page being freed and reallocated to a
different file, but not against the page being freed and reallocated to
a location in the same file which is outside (start, end)?
next prev parent reply other threads:[~2019-12-10 16:55 UTC|newest]
Thread overview: 21+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-10 16:24 [PATCHSET 0/5] Support for RWF_UNCACHED Jens Axboe
2019-12-10 16:24 ` [PATCH 1/5] fs: add read support " Jens Axboe
2019-12-10 16:24 ` [PATCH 2/5] mm: make generic_perform_write() take a struct kiocb Jens Axboe
2019-12-10 16:24 ` [PATCH 3/5] mm: make buffered writes work with RWF_UNCACHED Jens Axboe
2019-12-10 16:55 ` Matthew Wilcox [this message]
2019-12-10 17:02 ` Jens Axboe
2019-12-10 18:35 ` Chris Mason
2019-12-10 18:58 ` Matthew Wilcox
2019-12-10 19:10 ` Jens Axboe
2019-12-11 0:23 ` Dave Chinner
2019-12-11 0:28 ` Dave Chinner
2019-12-11 14:39 ` Jens Axboe
2019-12-10 16:24 ` [PATCH 4/5] iomap: pass in the write_begin/write_end flags to iomap_actor Jens Axboe
2019-12-10 16:24 ` [PATCH 5/5] iomap: support RWF_UNCACHED for buffered writes Jens Axboe
2019-12-10 21:17 ` [PATCHSET 0/5] Support for RWF_UNCACHED Andreas Dilger
2019-12-12 15:47 ` Christoph Hellwig
2019-12-12 15:52 ` Jens Axboe
2019-12-10 20:42 [PATCHSET v2 " Jens Axboe
2019-12-10 20:43 ` [PATCH 3/5] mm: make buffered writes work with RWF_UNCACHED Jens Axboe
2019-12-14 0:01 ` Andrew Morton
2019-12-11 15:29 [PATCHSET v3 0/5] Support for RWF_UNCACHED Jens Axboe
2019-12-11 15:29 ` [PATCH 3/5] mm: make buffered writes work with RWF_UNCACHED Jens Axboe
2019-12-12 19:01 [PATCHSET v4 0/5] Support for RWF_UNCACHED Jens Axboe
2019-12-12 19:01 ` [PATCH 3/5] mm: make buffered writes work with RWF_UNCACHED Jens Axboe
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