1#!/bin/ksh -p 2# 3# CDDL HEADER START 4# 5# The contents of this file are subject to the terms of the 6# Common Development and Distribution License (the "License"). 7# You may not use this file except in compliance with the License. 8# 9# You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 10# or https://opensource.org/licenses/CDDL-1.0. 11# See the License for the specific language governing permissions 12# and limitations under the License. 13# 14# When distributing Covered Code, include this CDDL HEADER in each 15# file and include the License file at usr/src/OPENSOLARIS.LICENSE. 16# If applicable, add the following below this CDDL HEADER, with the 17# fields enclosed by brackets "[]" replaced with your own identifying 18# information: Portions Copyright [yyyy] [name of copyright owner] 19# 20# CDDL HEADER END 21# 22 23# 24# Copyright (c) 2018 by Delphix. All rights reserved. 25# 26 27. $STF_SUITE/include/libtest.shlib 28 29# 30# DESCRIPTION: 31# Make sure that interleaving reads from different readers does not affect the 32# results that are returned. 33# 34# STRATEGY: 35# 1. Make sure a few debug messages have been logged. 36# 2. Open the procfs file and start reading from it. 37# 3. Open the file again, and read its entire contents. 38# 4. Resume reading from the first instance. 39# 5. Check that the contents read by the two instances are identical. 40# 41 42function cleanup 43{ 44 log_must rm -f $msgs1 $msgs2 45 datasetexists $FS && destroy_dataset $FS -r 46} 47 48typeset -r ZFS_DBGMSG=/proc/spl/kstat/zfs/dbgmsg 49typeset -r FS=$TESTPOOL/fs 50typeset msgs1 msgs2 51 52log_onexit cleanup 53 54# Clear out old messages 55echo 0 >$ZFS_DBGMSG || log_fail "failed to write to $ZFS_DBGMSG" 56 57# Add some new messages 58log_must zfs create $FS 59for i in {1..20}; do 60 log_must zfs snapshot "$FS@testsnapshot$i" 61done 62sync_pool $TESTPOOL 63 64msgs1=$(mktemp) || log_fail 65msgs2=$(mktemp) || log_fail 66 67# 68# Start reading file, pause and read it from another process, and then finish 69# reading. 70# 71{ dd bs=512 count=4; cp $ZFS_DBGMSG $msgs1; cat; } <$ZFS_DBGMSG >$msgs2 72 73# 74# Truncate the result of the read that completed second in case it picked up an 75# extra message that was logged after the first read completed. 76# 77log_must truncate -s $(stat_size $msgs1) $msgs2 78 79log_must diff $msgs1 $msgs2 80 81log_pass "Concurrent readers receive identical results" 82