[#LU-8130] Migrate from libcfs hash to rhashtable

# lfs setstripe -L mdt -E 1M /ai400/dom/
# salloc -p 40n --nodes=40 --ntasks-per-node=16 mpirun --allow-run-as-root /work/tools/bin/mdtest -t -F -P -w 3901 -e 3901 -d /ai400/dom/mdt_hard -n 10000 -a POSIX -N 1 -i 3 -p 10 

-- started at 06/03/2020 13:24:08 --

mdtest-3.3.0+dev was launched with 640 total task(s) on 40 node(s)
Command line used: /work/tools/bin/mdtest '-t' '-F' '-P' '-w' '3901' '-e' '3901' '-d' '/ai400/dom/mdt_hard' '-n' '10000' '-a' 'POSIX' '-N' '1' '-i' '3' '-p' '10'
Path: /ai400/dom
FS: 47.4 TiB   Used FS: 0.1%   Inodes: 371.8 Mi   Used Inodes: 0.0%

Nodemap: 1111111111111111000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000
V-0: Rank   0 Line  2137 Shifting ranks by 16 for each phase.
640 tasks, 6400000 files
[ec01:08604] 639 more processes have sent help message help-mpi-btl-openib.txt / error in device init
[ec01:08604] Set MCA parameter "orte_base_help_aggregate" to 0 to see all help / error messages
ior ERROR: open64("/ai400/dom/mdt_hard/test-dir.1-0/mdtest_tree.0/file.mdtest.24.9377", 66, 0664) failed, errno 16, Device or resource busy (aiori-POSIX.c:413)
--------------------------------------------------------------------------
MPI_ABORT was invoked on rank 24 in communicator MPI_COMM_WORLD
with errorcode -1.

NOTE: invoking MPI_ABORT causes Open MPI to kill all MPI processes.
You may or may not see output from other processes, depending on
exactly when Open MPI kills them.
--------------------------------------------------------------------------
--------------------------------------------------------------------------
An MPI communication peer process has unexpectedly disconnected.  This
usually indicates a failure in the peer process (e.g., a crash or
otherwise exiting without calling MPI_FINALIZE first).

Although this local MPI process will likely now behave unpredictably
(it may even hang or crash), the root cause of this problem is the
failure of the peer -- that is what you need to investigate.  For
example, there may be a core file that you can examine.  More
generally: such peer hangups are frequently caused by application bugs
or other external events.

  Local host: ec40
  Local PID:  4108
  Peer host:  ec02
--------------------------------------------------------------------------
[ec01:08604] 47 more processes have sent help message help-mpi-btl-tcp.txt / peer hung up
salloc: Relinquishing job allocation 4561

CC [M] /root/lustre-release/libcfs/libcfs/linux/linux-hash.o In file included from /root/lustre-release/libcfs/libcfs/linux/linux-hash.c:33:0: /root/lustre-release/libcfs/include/libcfs/linux/linux-hash.h:71:13: error: ‘struct rhashtable_iter’ declared inside parameter list [-Werror] struct rhashtable_iter *iter) ^ /root/lustre-release/libcfs/include/libcfs/linux/linux-hash.h:71:13: error: its scope is only this definition or declaration, which is probably not what you want [-Werror] /root/lustre-release/libcfs/include/libcfs/linux/linux-hash.h: In function ‘rhashtable_walk_enter’: /root/lustre-release/libcfs/include/libcfs/linux/linux-hash.h:76:2: error: implicit declaration of function ‘rhashtable_walk_init’ [-Werror=implicit-function-declaration] return rhashtable_walk_init(ht, iter); ^ /root/lustre-release/libcfs/include/libcfs/linux/linux-hash.h: In function ‘rhltable_init’: /root/lustre-release/libcfs/include/libcfs/linux/linux-hash.h:98:2: error: passing argument 2 of ‘rhashtable_init’ discards ‘const’ qualifier from pointer target type [-Werror] return rhashtable_init(&hlt->ht, params); <~snip~>

[LU-8130] Migrate from libcfs hash to rhashtable Created: 12/May/16 Updated: 05/Dec/23
Status:	Open
Project:	Lustre
Component/s:	None
Affects Version/s:	Lustre 2.9.0
Fix Version/s:	Upstream

[LU-8130] Migrate from libcfs hash to rhashtable Created: 12/May/16 Updated: 05/Dec/23