LL\_DECODE\_LINKEA(8) Lustre Configuration Utilities LL\_DECODE\_LINKEA(8)

# [NAME](#NAME)

ll\_decode\_linkea - display parent FIDs and name of a Lustre file

# [SYNOPSIS](#SYNOPSIS)

`ll_decode_linkea` *FILE* \[*FILE*...]

# [DESCRIPTION](#DESCRIPTION)

**ll\_decode\_linkea** decodes and prints the Lustre parent FIDs and name of a Lustre file, which are stored in the "trusted.link" attribute on MDT. This is accessible to **ll\_decode\_linkea** not only through Lustre client, but also when the MDT filesystem is mounted locally as type ldiskfs for maintenance.

The "trusted.link" extended attribute is saved when file/directory is created, and modified when renaming or hard link happens.

The parent FID is useful in case of MDT corruption. The fsck of ldiskfs can recover most of the ldiskfs hierarchy, but it might leave some files or directories under lost+found. The parent FIDs can be used to determine the right Lustre paths to move them to.

# [EXAMPLES](#EXAMPLES)

```
root@mdt1# cd /mnt/mdt/lost+found
root@mdt1# ll_decode_linkea #123451 #123452
#123451: count 2


    0: [0x200034021:0x2:0x0], name "file1"


    1: [0x200034021:0x1:0x0], name "file1_link"
#123452: count 1


    0: [0x200000007:0x1:0x0], name "file2"
```

This shows that there are 2 files in lost+found. **ll\_decode\_linkea** prints all of the parent FIDs of these files. file1 has two hard links, that is why it has two parent directories. **lfs fid2path** could be used to extract the paths of the parents.

Since "trusted.link" xattr is accessible on Lustre client too, **ll\_decode\_linkea** could also be used on Lustre client.

# [AVAILABILITY](#AVAILABILITY)

**ll\_decode\_linkea** is part of the [**lustre**(7)](/man/enterprise-packages/lustre/lustre.7) filesystem package since release 2.9.0

# [SEE ALSO](#SEE_ALSO)

[**lfs**(1)](/man/enterprise-packages/lustre/lfs.1), [**lustre**(7)](/man/enterprise-packages/lustre/lustre.7)

2024-08-28 Lustre

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Document: ll_decode_linkea(8) from lustre 2.17.59-r2 (Chainguard OS)
Source: https://github.com/lustre/lustre-release