| #!/bin/ksh -p |
| # |
| # CDDL HEADER START |
| # |
| # The contents of this file are subject to the terms of the |
| # Common Development and Distribution License (the "License"). |
| # You may not use this file except in compliance with the License. |
| # |
| # You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE |
| # or http://www.opensolaris.org/os/licensing. |
| # See the License for the specific language governing permissions |
| # and limitations under the License. |
| # |
| # When distributing Covered Code, include this CDDL HEADER in each |
| # file and include the License file at usr/src/OPENSOLARIS.LICENSE. |
| # If applicable, add the following below this CDDL HEADER, with the |
| # fields enclosed by brackets "[]" replaced with your own identifying |
| # information: Portions Copyright [yyyy] [name of copyright owner] |
| # |
| # CDDL HEADER END |
| # |
| |
| # |
| # Copyright (c) 2018 by Delphix. All rights reserved. |
| # |
| |
| . $STF_SUITE/include/libtest.shlib |
| |
| # |
| # DESCRIPTION: |
| # Make sure that interleaving reads from different readers does not affect the |
| # results that are returned. |
| # |
| # STRATEGY: |
| # 1. Make sure a few debug messages have been logged. |
| # 2. Open the procfs file and start reading from it. |
| # 3. Open the file again, and read its entire contents. |
| # 4. Resume reading from the first instance. |
| # 5. Check that the contents read by the two instances are identical. |
| # |
| |
| function cleanup |
| { |
| [[ -z $msgs1 ]] || log_must rm $msgs1 |
| [[ -z $msgs2 ]] || log_must rm $msgs2 |
| datasetexists $FS && destroy_dataset $FS -r |
| } |
| |
| typeset -r ZFS_DBGMSG=/proc/spl/kstat/zfs/dbgmsg |
| typeset -r FS=$TESTPOOL/fs |
| typeset msgs1 msgs2 |
| |
| log_onexit cleanup |
| |
| # Clear out old messages |
| echo 0 >$ZFS_DBGMSG || log_fail "failed to write to $ZFS_DBGMSG" |
| |
| # Add some new messages |
| log_must zfs create $FS |
| for i in {1..20}; do |
| log_must zfs snapshot "$FS@testsnapshot$i" |
| done |
| log_must zpool sync $TESTPOOL |
| |
| msgs1=$(mktemp) || log_fail |
| msgs2=$(mktemp) || log_fail |
| |
| # |
| # Start reading file, pause and read it from another process, and then finish |
| # reading. |
| # |
| { dd bs=512 count=4; cat $ZFS_DBGMSG >$msgs1; cat; } <$ZFS_DBGMSG >$msgs2 |
| |
| # |
| # Truncate the result of the read that completed second in case it picked up an |
| # extra message that was logged after the first read completed. |
| # |
| log_must truncate -s $(stat_size $msgs1) $msgs2 |
| |
| log_must diff $msgs1 $msgs2 |
| |
| log_pass "Concurrent readers receive identical results" |