[LU-8289] add ll_decode_linkea tool

• Status: Resolved
• Project: Lustre
• Fix Version/s: Lustre 2.9.0
• Type: New Feature
• Priority: Minor
• Reporter: Qian Yingjin (Inactive)
• Assignee: nasf (Inactive)
• Resolution: Fixed
• Labels: patch

Description

A MDT recovered by fsck might contain some files under lost+found
directory of ldiskfs. And in order to get the right path to move
them to, the xattr of trusted.link could be used to extract the
parent FIDs.

This path adds an new tool ll_decode_linkea to dump the parent FIDs
of a file.

Comments

[Qian Yingjin (Inactive)]

Li Xi ([e-mail]) uploaded a new patch: http://review.whamcloud.com/#/c/20444/
Subject: LU-8289 utils: add ll_decode_linkea tool
Project: fs/lustre-release
Branch: master
Current Patch Set: 2
Commit: abbee94b12ff03e1dba985e44e31aa7e35f6b7a4

[Peter Jones]

Fan Yong

Could you please review this work?

Thanks

Peter

[nasf (Inactive)]

Some clarify: the namespace LFSCK (since Lustre-2.7) can recover the orphan MDT-object from the ldiskfs backend /lost+found back to its original client-visible namespace. So this tool is mainly used for old Lustre release or under the case that the customer does not wants to run namespace LFSCK that may take long time on very large system.

[nasf (Inactive)]

Some enhancement can be considered: more integrated online tools that uses ll_decode_linkea and fid2path functionality, and can directly show the original position in the namespace; in further, it can move such orphan back to its original position.

[Gerrit Updater]

Oleg Drokin ([e-mail]) merged in patch http://review.whamcloud.com/20444/
Subject: LU-8289 utils: add ll_decode_linkea tool
Project: fs/lustre-release
Branch: master
Current Patch Set:
Commit: 11a138cb9d005ef0180421bd17542071b63e18d9

[Peter Jones]

Landed for 2.9