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 http://www.opensolaris.org/os/licensing. 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 [[ -z $msgs1 ]] || log_must rm $msgs1 45 [[ -z $msgs2 ]] || log_must rm $msgs2 46 datasetexists $FS && log_must zfs destroy -r $FS 47} 48 49typeset -r ZFS_DBGMSG=/proc/spl/kstat/zfs/dbgmsg 50typeset -r FS=$TESTPOOL/fs 51typeset msgs1 msgs2 52 53log_onexit cleanup 54 55# Clear out old messages 56echo 0 >$ZFS_DBGMSG || log_fail "failed to write to $ZFS_DBGMSG" 57 58# Add some new messages 59log_must zfs create $FS 60for i in {1..20}; do 61 log_must zfs snapshot "$FS@testsnapshot$i" 62done 63log_must zpool sync $TESTPOOL 64 65msgs1=$(mktemp) || log_fail 66msgs2=$(mktemp) || log_fail 67 68# 69# Start reading file, pause and read it from another process, and then finish 70# reading. 71# 72{ dd bs=512 count=4; cat $ZFS_DBGMSG >$msgs1; cat; } <$ZFS_DBGMSG >$msgs2 73 74# 75# Truncate the result of the read that completed second in case it picked up an 76# extra message that was logged after the first read completed. 77# 78log_must truncate -s $(stat_size $msgs1) $msgs2 79 80log_must diff $msgs1 $msgs2 81 82log_pass "Concurrent readers receive identical results" 83