linux-ext4 - [BUG] fsck unable to resolve filenames that include '='

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Date:   Tue, 2 Aug 2022 18:21:56 +1000
From:   Daniel Ng <danielng@...gle.com>
To:     linux-ext4@...r.kernel.org
Cc:     Sarthak Kukreti <sarthakkukreti@...gle.com>
Subject: [BUG] fsck unable to resolve filenames that include '='

Hi,

I've run into an issue when trying to use fsck with an ext4 image when
it has '=' in its name.

Repro steps:
1. fallocate -l 1G test=.img
2. mkfs.ext4 test=.img
3. fsck test=.img

Response:
'fsck.ext4: Unable to resolve '<path>/test=.img'

Expected:
fsck to do it's thing.

Observations:
Originally I wasn't sure what the source was, I thought that maybe
mkfs wasn't creating the image appropriately.
However, I've tried:
- renaming the image
- creating a hard-link to the image

Running fsck on either the renamed image, or the hard-link, works as expected.

Kernel version: Linux version 4.19.251-13516-ga0bcf8d80077
Environment: Running on a Chromebook

Kind regards,
Daniel