[LU-19750] interop: master+b2_15 client can't access changelog due to missing mdt_body in open request

• Type: Bug
• Resolution: Fixed
• Priority: Medium
• Fix Version/s: Lustre 2.18.0
• Severity: 3
• Assignee: Andreas Dilger
• Reporter: Alex Zhuravlev

Description

mdt_changelog_allow() has a check preventing "new" clients (after 2.17+) from accessing changelog if no correct credentials are provided in form of mdt_body structure.
which is not provided because llog_client_open() is used with nameless changelogs and the client can't access mdt_body buffer set after undefined name buffer:

[   39.512638] LustreError: 8576:0:(llog_cat.c:395:llog_cat_id2handle()) lustre-MDT0000-mdc-ffff8d05dc1a4000: error opening log id [0x1:0xa:0x0]: rc = -13
[   39.513001] Lustre: 8576:0:(llog_cat.c:839:llog_cat_process_common()) lustre-MDT0000-mdc-ffff8d05dc1a4000: can't find llog handle [0x1:0xa:0x0]: rc = -13
[   39.513395] LustreError: 8576:0:(mdc_changelog.c:326:chlg_load()) lustre-MDT0000-mdc-ffff8d05dc1a4000: fail to process llog: rc = -13

This causes sanity test_160a to fail:

lfs changelog: cannot access changelog: Permission denied
 sanity test_160a: @@@@@@ FAIL: MKDIR changelog mask count 0 != 1 

Issue Links

• is related to: LU-19864 sanity-sec/35: Check permissions when accessing changelogs LBUG
• is related to: LU-13064 Check permissions when accessing changelogs