MD: raid5 do not set fullsync
Add check to determine if a device needs full resync or if partial resync will do RAID 5 was assuming that if a device was not In_sync, it must undergo a full resync. We add a check to see if 'saved_raid_disk' is the same as 'raid_disk'. If it is, we can safely skip the full resync and rely on the bitmap for partial recovery instead. This is the legitimate purpose of 'saved_raid_disk', from md.h: int saved_raid_disk; /* role that device used to have in the * array and could again if we did a partial * resync from the bitmap */ Signed-off-by: Jonathan Brassow <jbrassow@redhat.com> Signed-off-by: NeilBrown <neilb@suse.de>
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9c81075f43
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d6b212f4b1
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@ -4858,7 +4858,7 @@ static raid5_conf_t *setup_conf(mddev_t *mddev)
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printk(KERN_INFO "md/raid:%s: device %s operational as raid"
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" disk %d\n",
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mdname(mddev), bdevname(rdev->bdev, b), raid_disk);
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} else
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} else if (rdev->saved_raid_disk != raid_disk)
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/* Cannot rely on bitmap to complete recovery */
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conf->fullsync = 1;
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}
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