linux-kernel - [PATCH STABLE ONLY] swap: fix swapfile page to sector mapping

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Message-Id: <20210304150824.29878-1-ailiop@suse.com>
Date:   Thu,  4 Mar 2021 16:08:20 +0100
From:   Anthony Iliopoulos <ailiop@...e.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jens Axboe <axboe@...nel.dk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Matthew Wilcox <willy@...radead.org>
Cc:     stable@...r.kernel.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH STABLE ONLY] swap: fix swapfile page to sector mapping

The following patches fix the swapfile page-to-sector mapping for block
devices that implement rw_page for all the stable kernels.

This is related to the upstream fix of commit caf6912f3f4a ("swap: fix
swapfile read/write offset"), but for kernels prior to v5.12-rc1 the bug
only affects swapfiles that sit on top of block devices which provide a
rw_page operation.