[LU-6284] FLD read is not swabbed correctly

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.9.0
• Affects Version/s: Lustre 2.8.0
• Labels: llnl ppc
• Severity: 3
• Assignee: nasf (Inactive)
• Reporter: Andreas Dilger

Description

The RQF_FLD_READ RPC reply format is defined with "generic_data" (RQF_GENERIC_DATA) as the second field, but in fact this is always struct lu_seq_range_array in the two places that I see it used. Since RQF_FLD_READ does not have any swabber associated with generic data, the client will not swab the FLD reply data.

That doesn't cause a problem for current code, because it always assumes MDT0000 for any FID lookup, and we haven't tested DNE + PPC client systems yet, nor do we have mixed-endian MDS/OSS combinations. However, this will break for DNE + PPC clients and should be fixed.

Issue Links

• is related to: LU-6831 The ticket for tracking all DNE2 bugs
• is related to: LU-5345 PPC mdc_read_page(): Page-wide hash collision: 0xfeffffffffffffff
• is related to: LU-6387 Add Power8 support to Lustre