[LU-14757] WBC: MemFS lookup fallback to Lustre lookup

• Type: Technical task
• Resolution: Unresolved
• Priority: Minor
• Assignee: Qian Yingjin
• Reporter: Qian Yingjin

Description

In WBC lock drop flush mode, when enter into the code path @memfs_lookup during the new file creation, and the dir (parent inode) is already flushed (WBC state for the directory becomes WBC_STATE_FL_NONE), at this time, it will fall back into the Lustre lookup path @ll_lookup_nd to perform lookup from MDT. The old the Lustre lookup path with LOOKUP_CREATE | LOOKUP_OPEN will return ERR_PTR(-ENOENT) wrongly.

In this patch, it fixed this bug, and when lookup from MDT returns -ENOENT to indicate the name is not existed, it will return NULL instead of ERR_PTR(-ENOENT).

Comments

[Gerrit Updater]

Yingjin Qian ([e-mail]) uploaded a new patch: https://review.whamcloud.com/43984
Subject: LU-14757 wbc: MemFS lookup fallback to Lustre lookup
Project: fs/lustre-release
Branch: master
Current Patch Set: 1
Commit: 6387aed0ea44b0f5e87d917d015937e14ffcd3c8