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zipl_helper.device-mapper: fix bug in get_physical_device()

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Fix mistake in @fs_offset calculation.

Since any logical dm-device can be built of partitions, @fs_offset
must not decrease while ascending the "device tree" during the
procedure of dm-device resolution (which always starts at the
formatted logical device, for which @fs_offset is 0).

This bug was not reproducible earlier because of restricted
functionality in a combination with side-effects. The fixup is
required however by the next patches in the series implementing
support of mirrored targets by zipl tool

Signed-off-by: Eduard Shishkin <edward6@linux.ibm.com>
Reviewed-by: Stefan Haberland <sth@linux.ibm.com>
Signed-off-by: Steffen Eiden <seiden@linux.ibm.com>
This commit is contained in:
Eduard Shishkin
2023-09-20 13:18:55 +02:00
committed by Steffen Eiden
parent d6b702d579
commit 9cfaac58ea
1 changed files with 1 additions and 1 deletions
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2
zipl/src/zipl_helper.device-mapper.c
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@@ -860,7 +860,7 @@ static int get_physical_device(struct physical_device *pd, dev_t dev,
target_entry_new(makedev(major, minor), target));
table_free(table);
/* Convert fs_start to offset on parent target */
start -= target->start;
start += target->start;
}
}