IO classes config load fail on kernel 5.18

[Kgierszx]

Description

During load random IO class configuration for each cache, unexpected message appear "Unexpected classification rule condition".
Bug found on kernel 5.18.19-051819-generic.
Bug don`t appear on kernel 5.15.

Expected Behavior

Config loaded successfully.

Actual Behavior

During config load message "Unexpected classification rule condition" appear.

Steps to Reproduce.

1.Prepare caches and cores.
2.Load IO class config.

Context

Possible Fix

Logs

Your Environment

• OpenCAS version (commit hash or tag):
• Operating System: Ubuntu22.04
• Kernel version:5.18.19
• Cache device type (NAND/Optane/other):
• Core device type (HDD/SSD/other):
• Cache configuration:
• • Cache mode: (default: wt)
• • Cache line size: (default: 4)
• • Promotion policy: (default: always)
• • Cleaning policy: (default: alru)
• • Sequential cutoff policy: (default: full)
• Other (e.g. lsblk, casadm -P, casadm -L)

opencas_ioclass.conf:

IO class id,IO class name,Eviction priority,Allocation
0,unclassified,161,0.66
1,pid:le:916054&done,26,0.85
2,extension:f4Kg&done,208,0.82
3,directory:/1AZr,27,0.98
4,file_name_prefix:a6ldNY,35,0.63
5,process_name:C9xa0Seh,235,0.47
6,io_class:234,165,0.21
7,file_offset:ge:842948&done,248,0.50
8,file_offset:gt:480082,89,0.01
9,direct&done,141,0.27
10,pid:gt:395414&done,223,0.33
11,file_size:lt:962628,125,0.68
12,direct&done,152,0.60
13,wlth:eq:172446,26,0.75
14,file_size:le:542289,228,0.53
15,io_class:251,255,0.82
16,direct,230,0.27
17,file_size:gt:516456,2,0.81
18,io_class:188,162,0.50
19,metadata&done,50,0.74
20,extension:TCe3qbV&done,23,0.00
21,wlth:lt:173249,190,0.70
22,request_size:gt:876661,148,0.46
23,direct&done,6,0.05
24,directory:/fKq0d5PVaYAQ8Li,75,0.96
25,io_class:172,220,0.14
26,extension:iN7g,132,0.05
27,wlth:le:310732,121,0.35
28,file_name_prefix:d7RhhnE,37,0.12
29,file_offset:le:668241,255,0.03
30,file_size:eq:978313,72,0.44
31,file_name_prefix:3,147,0.04
32,directory:/TK1FzwOJj4G1oxvxmzMp4&done,119,0.53

[katlapinka]

When I removed all "wlth" rules - everything works fine. Otherwise it occurs on CentOS 9 with kernel 5.14.0-479.el9.x86_64

[robertbaldyga]

WLTH has been officially removed from kernel version 5.18, but some distribution kernels backported this change to earlier kernel version. Hence unavailability of wlth rule on recent distribution kernels is expected.

[katlapinka]

Expected behavior. I opened enhancement for making casadm output more accurate while loading faulty config file: #1491