Re: Assistance needed mounting XFS version 1 filesystem

[Jordan <jordan.chadwick@gmail.com>]

On Fri, Jan 22, 2010 at 11:39 PM, Eric Sandeen <sandeen@sandeen.net> wrote:
> Jordan wrote:
>> Hello,
>> I have been trying to mount an old Maxoptix optical drive with
>> XFS-formatted media for a week now without success.  From what I can
>> tell, the media were formatted using XFS version 1, support for which
>> was removed from the Linux kernel a few years back.
>>
>> Here is the output of fdisk -l:
>> Disk /dev/sda (SGI disk label): 64 heads, 32 sectors, 1096 cylinders
>> Units = cylinders of 2048 * 512 bytes
>>
>> ----- partitions -----
>> Pt#     Device  Info     Start       End   Sectors  Id  System
>>  1:  /dev/sda1  boot         2       986   2018340   a  SGI xfs
>>  2:  /dev/sda2  swap       987      1096    224490   3  SGI raw
>>  9:  /dev/sda3               0         1      2100   0  SGI volhdr
>> 11:  /dev/sda4               0      1096   2244930   6  SGI volume
>> ----- Bootinfo -----
>> Bootfile: /unix
>> ----- Directory Entries -----
>>  0: sgilabel   sector    2 size     512
>>
>> When I try to mount the /dev/sda1 partition, I get the following error:
>>
>> # mount -t xfs /dev/sda1 /optical
>> mount: block device /dev/sda1 is write-protected, mounting read-only
>> mount: /dev/sda1: can't read superblock
>>
>> # dmesg | tail
>> Current sda: sense key Data Protect
>> Additional sense: Write protected
>> end_request: I/O error, dev sda, sector 1017642
>
> Seems like this might be a real IO error... it's within the size
> of sda1 (from above), and also within the filesystem geometry
> (from db output below)
>
> Maybe you can try creating a dd_rescue image of the fs, and mount that?
>
> -Eric


That did the trick.  Thanks very much for the idea, I hadn't thought
to try accessing it through another means besides mount.

Jordan


>
>> xfs_force_shutdown(sda1,0x1) called from line 353 of file
>> fs/xfs/xfs_rw.c.  Return address = 0x44ff9bfa
>> Filesystem "sda1": I/O Error Detected.  Shutting down filesystem: sda1
>> Please umount the filesystem, and rectify the problem(s)
>> I/O error in filesystem ("sda1") meta-data dev sda1 block 0xf7dfe
>>  ("xlog_bwrite") error 5 buf count 131072
>> XFS: failed to locate log tail
>> XFS: log mount/recovery failed
>> XFS: log mount failed
>>
>> xfs_check comes back with no errors.
>>
>> # xfs_db /dev/sda1
>> xfs_db> sb 0
>> xfs_db> p
>> magicnum = 0x58465342
>> blocksize = 4096
>> dblocks = 252292
>> rblocks = 0
>> rextents = 0
>> uuid = d4bc0c01-b21d-1001-866b-0800690a794d
>> logstart = 131076
>> rootino = 128
>> rbmino = 129
>> rsumino = 130
>> rextsize = 16
>> agblocks = 31537
>> agcount = 8
>> rbmblocks = 0
>> logblocks = 1000
>> versionnum = 0x1
>> sectsize = 512
>> inodesize = 256
>> inopblock = 16
>> fname = "\000\000\000\000\000\000\000\000\000\000\000\000"
>> blocklog = 12
>> sectlog = 9
>> inodelog = 8
>> inopblog = 4
>> agblklog = 15
>> rextslog = 0
>> inprogress = 0
>> imax_pct = 25
>> icount = 704
>> ifree = 322
>> fdblocks = 122918
>> frextents = 0
>> uquotino = 0
>> gquotino = 0
>> qflags = 0
>> flags = 0
>> shared_vn = 0
>> inoalignmt = 0
>> unit = 0
>> width = 0
>> dirblklog = 0
>> logsectlog = 0
>> logsectsize = 0
>> logsunit = 0
>> features2 = 0
>> xfs_db>
>>
>> My running kernel is 2.6.5-1.358 on Fedora Core 2.  I went with an old
>> distribution to try to find a kernel that still has XFS version 1
>> support built in.
>>
>> Any help or advice you could provide would be great.
>>
>> Jordan
>>
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>
>

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