linux-kernel - fix the name_to_dev

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Date:   Wed, 31 May 2023 14:55:11 +0200
From:   Christoph Hellwig <hch@....de>
To:     Jens Axboe <axboe@...nel.dk>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Mike Snitzer <snitzer@...nel.org>,
        Joern Engel <joern@...ybastard.org>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Pavel Machek <pavel@....cz>,
        Loic Poulain <loic.poulain@...aro.org>, dm-devel@...hat.com,
        linux-kernel@...r.kernel.org, linux-block@...r.kernel.org,
        linux-mtd@...ts.infradead.org, linux-pm@...r.kernel.org
Subject: fix the name_to_dev_t mess v2

Hi all,

this series tries to sort out accumulated mess around the name_to_dev_t
function.  This function is intended to allow looking up the dev_t of a
block device based on a name string before the root file systems is
mounted and thus the normal path based lookup is available.

Unfortunately a few years ago it managed to get exported and used in
non-init contexts, leading to the something looking like a path name
also beeing lookuped up by a different and potential dangerous
algorithm.

This series does a fair amount of refactoring and finally ends up with
the renamed and improved name_to_dev_t only beeing available for the
early init code again.

The series is against Jens' for-6.5/block tree but probably applies
against current mainline just fine as well.

A git tree is also available here:

    git://git.infradead.org/users/hch/block.git blk-init-cleanup

Gitweb:

    http://git.infradead.org/users/hch/block.git/shortlog/refs/heads/blk-init-cleanup

Changes since v1:
 - really propagate the actual error in dm_get_device
 - improve the documentation in kernel-parameters.txt
 - spelling fixes

Diffstat: