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由 Dan Williams 提交于
Enable external metadata arrays to manage rebuild checkpointing via a md/dev-XXX/recovery_start attribute which reflects rdev->recovery_offset Also update resync_start_store to allow 'none' to be written, for consistency. Signed-off-by: NDan Williams <dan.j.williams@intel.com> Signed-off-by: NNeilBrown <neilb@suse.de>
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