[LU-3182] duplicate directory entries from readdir()

• Type: Bug
• Resolution: Fixed
• Priority: Major
• Fix Version/s: Lustre 2.4.0, Lustre 2.5.0
• Affects Version/s: Lustre 2.4.0
• Labels: ppc
• Severity: 3
• Assignee: Emoly Liu
• Reporter: Ned Bass (Inactive)

Description

lmv_readpage() fails to overwrite the ldp_hash_end and ldp_flags of the first lu_dirpage in a CFS_PAGE with the values from the last lu_dirpage. This causes duplicate directory entries to be returned from readdir() for sufficiently large directories. This is only an issue on platforms where CFS_PAGE_SIZE > LU_PAGE_SIZE, i.e. PPC.

The regression was introduced in patch http://review.whamcloud.com/#change,5011, with the apparently accidental removal of these lines from lmv_readpage():

    -                        hash_end = dp->ldp_hash_end;
    -                        flags = dp->ldp_flags;