[LU-9468] incorrect stat from kthread with X86_X32 architecture

• Status: Resolved
• Project: Lustre
• Affects Version/s: Lustre 2.7.0, Lustre 2.9.0
• Fix Version/s: Lustre 2.10.0
• Type: Bug
• Priority: Minor
• Reporter: Frank Zago (Inactive)
• Assignee: Frank Zago (Inactive)
• Resolution: Fixed
• Severity: 3

Description

Under the following conditions, ll_getattr will flatten the inode number when it shouldn't:

• the X86_X32 architecture is defined CONFIG_X86_X32, and not even used,
• ll_getattr is called from a kernel thread (though vfs_stat for instance).

This has the result that inode numbers are different whether the same file is stat'ed from a kernel thread, or from a syscall. For instance, 4198401 vs. 144115205272502273.

ll_getattr calls ll_need_32bit_api to determine whether the task is 32 bits. When the combination is kthread+X86_X32, that function returns that the task is 32 bits, which is incorrect, as the kernel is 64 bits.

The solution is to check whether the call is from a kernel thread (which is 64 bits) and act consequently.

Comments

[Gerrit Updater]

Frank Zago ([e-mail]) uploaded a new patch: https://review.whamcloud.com/26992
Subject: LU-9468 llite: qwertyuio
Project: fs/lustre-release
Branch: master
Current Patch Set: 1
Commit: 7e62b3be7cafef486d200fff83bd34a56cadff74

[Gerrit Updater]

Oleg Drokin ([e-mail]) merged in patch https://review.whamcloud.com/26992/
Subject: LU-9468 llite: fix for stat under kthread and X86_X32
Project: fs/lustre-release
Branch: master
Current Patch Set:
Commit: 86d26552f91e4b8cfe79a55cae8746aa1c18001e

[Peter Jones]

Landed for 2.10