md: allow autodetection of superblock v1.x#245
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Currently, md autodetect only supports version 0.90 superblocks. This patch enables the kernel to autodetect the version of the superblock during autodetection by trying which version succeeds loading. mdadm uses a similar approach. Version 1 superblocks don't store a preferred minor number, so one is picked from 0xffff downwards so it is unlikely to cause collisions. A new helper md_autodetect_bind_export_rdev is added for use in md_setup_drive in md_autodetect.c. It wraps bind_rdev_to_array() and export_rdev() to keep them private to md.c Updated md.rst to reflect the removed restriction. This has been tested with v0.90, v1.0-2 arrays both with assembly explicitly through md=... and automatic detection. This patch supersedes my previous submission sent on 2025-08-25: md: Allow setting persistent superblock version for md= command line Signed-off-by: Jeremias Stotter <jeremias@jears.at>
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Upstream branch: c17fb54 |
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Pull request for series with
subject: md: allow autodetection of superblock v1.x
version: 1
url: https://patchwork.kernel.org/project/linux-raid/list/?series=999784