[LU-12652] osd_attr_set() fails with ENOSPC on linux-4.18

• Type: Bug
• Resolution: Fixed
• Priority: Minor
• Fix Version/s: Lustre 2.14.0
• Environment: ldiskfs, 4.18
• Severity: 3
• Assignee: Alex Zhuravlev
• Reporter: Alex Zhuravlev

Description

few different tests can fail with the following symptom:
Lustre: 9035:0:(osd_handler.c:3066:osd_attr_set()) lustre-MDT0000: set [0x200002342:0x35:0x0] lma flags 28 failed: rc = -28
LustreError: 9035:0:(out_lib.c:629:out_tx_attr_set_undo()) lustre-MDT0000-osd: attr set undo [0x200000007:0x1:0x0] unimplemented yet!: rc = -524
LustreError: 9035:0:(out_lib.c:1190:out_tx_index_delete_undo()) lustre-MDT0000-osd: Oops, can not rollback index_delete yet: rc = -524
Lustre: DEBUG MARKER: sanity test_31f: @@@@@@ FAIL: first of /mnt/lustre/d31f

this is because ext4 in linux-4.18 has the following check:

                if (!ldiskfs_handle_has_enough_credits(handle, credits)) {
                        error = -ENOSPC;
                        goto cleanup;

while ext4's credit calculation is way too pessimistic.

Issue Links

• is related to: LU-15083 osp_last_used_init() returns -28