xfs_repair Input/output error

[Cory Coager]

I had a power failure while I was running a defrag on an xfs partition. Now
I am unable to mount, xfs_check or xfs_repair the partition. The partition
is lvm and all other partitions seem to be fine except this one. When
attempting to mount the partition the drive makes some funny noises and
these messages spit out on the console:

hda: dma_intr: status=0x51 { DriveReady SeekComplete Error }
hda: dma_intr: error=0x40 { UncorrectableError }, LBAsect=268552872,
high=16, low=117416, sector=268552868
ide: failed opcode was: unknown
end_request: I/O error, dev hda, sector 268552868

I believe the drive is fine because check_ide_smart reports:

Id=  1, Status=11 {PreFailure , OnLine }, Value=100, Threshold= 60, Passed
Id=  2, Status= 5 {PreFailure , OffLine}, Value=100, Threshold= 50, Passed
Id=  3, Status= 7 {PreFailure , OnLine }, Value=151, Threshold= 24, Passed
Id=  4, Status=18 {Advisory    , OnLine }, Value=100, Threshold=  0, Passed
Id=  5, Status=51 {PreFailure , OnLine }, Value=100, Threshold=  5, Passed
Id=  7, Status=11 {PreFailure , OnLine }, Value=100, Threshold= 67, Passed
Id=  8, Status= 5 {PreFailure , OffLine}, Value=100, Threshold= 20, Passed
Id=  9, Status=18 {Advisory    , OnLine }, Value= 96, Threshold=  0, Passed
Id= 10, Status=19 {PreFailure , OnLine }, Value=100, Threshold= 60, Passed
Id= 12, Status=50 {Advisory    , OnLine }, Value=100, Threshold=  0, Passed
Id=192, Status=50 {Advisory    , OnLine }, Value= 99, Threshold= 50, Passed
Id=193, Status=18 {Advisory    , OnLine }, Value= 99, Threshold= 50, Passed
Id=194, Status= 2 {Advisory    , OnLine }, Value=137, Threshold=  0, Passed
Id=196, Status=50 {Advisory    , OnLine }, Value=100, Threshold=  0, Passed
Id=197, Status=34 {Advisory    , OnLine }, Value=100, Threshold=  0, Passed
Id=198, Status= 8 {Advisory    , OffLine}, Value=100, Threshold=  0, Passed
Id=199, Status=10 {Advisory    , OnLine }, Value=200, Threshold=  0, Passed
OffLineStatus=0 {NeverStarted}, AutoOffLine=No, OffLineTimeout=92 minutes
OffLineCapability=27 {Immediate Auto SuspendOnCmd}
SmartRevision=16, CheckSum=151, SmartCapability=3 {SaveOnStandBy AutoSave}

I can xxd and dd this partition without getting any console errors. I can
also mount the partition with -o ro,norecovery.  How do I repair this and
recover my data?
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