From: Minchan Kim <minchan@kernel.org>
To: Pankaj Raghav <p.raghav@samsung.com>
Cc: axboe@kernel.dk, martin@omnibond.com, hubcap@omnibond.com,
brauner@kernel.org, viro@zeniv.linux.org.uk,
senozhatsky@chromium.org, akpm@linux-foundation.org,
willy@infradead.org, hch@lst.de, devel@lists.orangefs.org,
mcgrof@kernel.org, linux-block@vger.kernel.org,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
gost.dev@samsung.com, linux-fsdevel@vger.kernel.org
Subject: Re: [PATCH v2 1/5] zram: always chain bio to the parent in read_from_bdev_async
Date: Mon, 3 Apr 2023 14:19:31 -0700 [thread overview]
Message-ID: <ZCtC4yhM5lZP7mEg@google.com> (raw)
In-Reply-To: <20230403132221.94921-2-p.raghav@samsung.com>
On Mon, Apr 03, 2023 at 03:22:17PM +0200, Pankaj Raghav wrote:
> zram_bvec_read() is called with the bio set to NULL only in
> writeback_store() function. When a writeback is triggered,
> zram_bvec_read() is called only if ZRAM_WB flag is not set. That will
> result only calling zram_read_from_zspool() in __zram_bvec_read().
>
> rw_page callback used to call read_from_bdev_async with a NULL parent
> bio but that has been removed since commit 3222d8c2a7f8
> ("block: remove ->rw_page").
>
> We can now safely always call bio_chain() as read_from_bdev_async() will
> be called with a parent bio set. A WARN_ON_ONCE is added if this function
> is called with parent set to NULL.
>
> Signed-off-by: Pankaj Raghav <p.raghav@samsung.com>
Acked-by: Minchan Kim <minchan@kernel.org>
Thanks.
next prev parent reply other threads:[~2023-04-03 21:20 UTC|newest]
Thread overview: 15+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <CGME20230403132223eucas1p28adb1d36d39add989d46e9f175c07986@eucas1p2.samsung.com>
2023-04-03 13:22 ` [PATCH v2 0/5] remove page_endio() Pankaj Raghav
2023-04-03 13:22 ` [PATCH v2 1/5] zram: always chain bio to the parent in read_from_bdev_async Pankaj Raghav
2023-04-03 21:19 ` Minchan Kim [this message]
2023-04-04 15:06 ` Christoph Hellwig
2023-04-04 19:31 ` Andrew Morton
2023-04-05 6:07 ` Christoph Hellwig
2023-04-11 7:34 ` Pankaj Raghav
2023-04-03 13:22 ` [PATCH v2 2/5] orangefs: use folios in orangefs_readahead Pankaj Raghav
2023-04-04 15:07 ` Christoph Hellwig
2023-04-03 13:22 ` [PATCH v2 3/5] mpage: split bi_end_io callback for reads and writes Pankaj Raghav
2023-04-04 15:09 ` Christoph Hellwig
2023-04-03 13:22 ` [PATCH v2 4/5] mpage: use folios in bio end_io handler Pankaj Raghav
2023-04-04 15:10 ` Christoph Hellwig
2023-04-03 13:22 ` [PATCH v2 5/5] filemap: remove page_endio() Pankaj Raghav
2023-04-04 15:10 ` Christoph Hellwig
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