linux-kernel - [PATCH] loop: drop caches if offset or block

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Date:   Mon, 15 Apr 2019 14:13:21 -0700
From:   grygorii tertychnyi <gtertych@...co.com>
To:     jaegeuk@...nel.org, gwendal@...omium.org
Cc:     xe-linux-external@...co.com, axboe@...nel.dk,
        linux-block@...r.kernel.org,
        linux-f2fs-devel@...ts.sourceforge.net,
        linux-kernel@...r.kernel.org
Subject: [PATCH] loop: drop caches if offset or block_size are changed

Jaegeuk,

We also observed an issue with this patch.

After heavely working with image.bin (haxdump with different offsets)
next mount call fails:

# mount -o ro,loop,offset=45967633 -t squashfs image.bin /tmp/gi45
mount: image.bin: failed to setup loop device: Resource temporarily unavailable

# dmesg | tail -n1
loop_set_status: loop2 () has still dirty pages (nrpages=1)


-- Grygorii