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Status Delivered
Workspace Storage Scale (formerly known as GPFS)
Created by Guest
Created on Nov 22, 2022

RELATED IDEAS

DMAPI call dm_fd_to_handle can cause kernel crash

Our concerns centre around the behaviour of dm_fd_to_handle and dm_path_to_handle. According to the Data Storage Management (XDSM) API specification, these functions should fail with ENXIO when “The file system containing the file opened on fd or the final component of path does not support the DMAPI”.

However our testing has shown the following on Spectrum Scale 5.1.0 and 5.1.5:

Documented

5.1.0

5.1.5

dm_fd_to_handle

DMAPI-enabled GPFS

Success

Success

Success

DMAPI-disabled GPFS

ENXIO

Incorrect Success

Incorrect Success

Non-GPFS (e.g. xfs)

ENXIO

EBADF

Kernel Crash

dm_path_to_handle

DMAPI-enabled GPFS

Success

Success

Success

DMAPI-disabled GPFS

ENXIO

Incorrect Success

Incorrect Success

Non-GPFS (e.g. xfs)

ENXIO

ENXIO

ENXIO


The results highlighted in red are inconsistent with the Data Storage Management (XDSM) API specification, and are not flagged anywhere we can see in the Spectrum Scale documentation (e.g. https://www.ibm.com/docs/en/spectrum-scale/5.1.5?topic=functions-mandatory-implemented-in-dmapi-gpfs). Note also that the ‘Incorrect Success‘ results return a handle that may not actually be used to e.g. obtain rights with dm_request_right.


Idea priority Urgent
  • Admin
    THOMAS O'BRIEN
    Reply
    |     Sep 15, 2023

    delivered in Scale 5.1.7.1

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