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由 Shaohua Li 提交于
raid5-cache uses journal disk rdev->bdev, rdev->mddev in several places. Don't allow journal disk disappear magically. On the other hand, we do need to update superblock for other disks to bump up ->events, so next time journal disk will be identified as stale. Signed-off-by: NShaohua Li <shli@fb.com> Signed-off-by: NNeilBrown <neilb@suse.com>
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