Weird xfs_repair error

[Emmanuel Florac <eflorac@intellique.com>]

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After a RAID controller went bananas, I encountered an XFS corruption
on a filesystem. Weirdly, the corruption seems to be mostly located in
lost+found.

(I'm currently working on a metadump'd image of course, not the real
thing; there are 90TB of data to be hopefully salvaged in there).

"ls /mnt/rescue/lost+found" gave this:

XFS (loop0): metadata I/O error: block 0x22b03f490
("xfs_trans_read_buf_map") error 117 numblks 16 
XFS (loop0): xfs_imap_to_bp: xfs_trans_read_buf() returned error 117.
XFS (loop0): Corruption detected. Unmount and run xfs_repair 
XFS (loop0): Corruption detected. Unmount and run xfs_repair

I've run xfs_repair 4.9 on the xfs_mdrestored image. It dumps an insane
lot of errors (the output log is 65MB)  and ends with this very strange
message:

disconnected inode 26417467, moving to lost+found
disconnected inode 26417468, moving to lost+found
disconnected inode 26417469, moving to lost+found
disconnected inode 26417470, moving to lost+found

fatal error -- name create failed in lost+found (117), filesystem may
be out of space

Even stranger, after mounting back the image, there is no lost+found
anywhere to be found! However the filesystem has lots of free space and
free inodes, how come?

df -i
Sys. fich.                    Inodes  IUtil.     ILibre IUti% Monté sur
rootfs                             0       0          0     - /
/dev/root                          0       0          0     - /
tmpfs                        2058692     990    2057702    1% /run
tmpfs                        2058692       6    2058686    1% /run/lock
tmpfs                        2058692    1623    2057069    1% /dev
tmpfs                        2058692       3    2058689    1% /run/shm
guitare:/mnt/raid/partage   33554432  305069   33249363    1% /mnt/qnap1
/dev/loop0                4914413568 5199932 4909213636    1% /mnt/rescue

df
/dev/loop0                122858252288 88827890868 34030361420  73% /mnt/rescue

I'll give a shot to a newer version of xfs_repair just in case...

-- 
------------------------------------------------------------------------
Emmanuel Florac     |   Direction technique
                    |   Intellique
                    |	<eflorac@intellique.com>
                    |   +33 1 78 94 84 02
------------------------------------------------------------------------

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