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Matt Whitlock fbcc04ad7a dm-unstripe: fix mapping bug when there are multiple targets in a table 
[ Upstream commit 83c10e8dd4 ]

The "unstriped" device-mapper target incorrectly calculates the sector
offset on the mapped device when the target's origin is not zero.

Take for example this hypothetical concatenation of the members of a
two-disk RAID0:

linearized:       0 2097152 unstriped 2 128 0 /dev/md/raid0 0
linearized: 2097152 2097152 unstriped 2 128 1 /dev/md/raid0 0

The intent in this example is to create a single device named
/dev/mapper/linearized that comprises all of the chunks of the first disk
of the RAID0 set, followed by all of the chunks of the second disk of the
RAID0 set.

This fails because dm-unstripe.c's map_to_core function does its
computations based on the sector number within the mapper device rather
than the sector number within the target. The bug turns invisible when
the target's origin is at sector zero of the mapper device, as is the
common case. In the example above, however, what happens is that the
first half of the mapper device gets mapped correctly to the first disk
of the RAID0, but the second half of the mapper device gets mapped past
the end of the RAID0 device, and accesses to any of those sectors return
errors.

Signed-off-by: Matt Whitlock <kernel@mattwhitlock.name>
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Cc: stable@vger.kernel.org
Fixes: 18a5bf2705 ("dm: add unstriped target")
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2026-03-04 07:21:46 -05:00
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README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.