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d1261452 JG |
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 | ||
42 | function cleanup | |
43 | { | |
44 | [[ -z $msgs1 ]] || log_must rm $msgs1 | |
45 | [[ -z $msgs2 ]] || log_must rm $msgs2 | |
90b77a03 | 46 | datasetexists $FS && destroy_dataset $FS -r |
d1261452 JG |
47 | } |
48 | ||
49 | typeset -r ZFS_DBGMSG=/proc/spl/kstat/zfs/dbgmsg | |
50 | typeset -r FS=$TESTPOOL/fs | |
51 | typeset msgs1 msgs2 | |
52 | ||
53 | log_onexit cleanup | |
54 | ||
55 | # Clear out old messages | |
56 | echo 0 >$ZFS_DBGMSG || log_fail "failed to write to $ZFS_DBGMSG" | |
57 | ||
58 | # Add some new messages | |
59 | log_must zfs create $FS | |
60 | for i in {1..20}; do | |
61 | log_must zfs snapshot "$FS@testsnapshot$i" | |
62 | done | |
63 | log_must zpool sync $TESTPOOL | |
64 | ||
65 | msgs1=$(mktemp) || log_fail | |
66 | msgs2=$(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 | # | |
7839c4b5 | 78 | log_must truncate -s $(stat_size $msgs1) $msgs2 |
d1261452 JG |
79 | |
80 | log_must diff $msgs1 $msgs2 | |
81 | ||
82 | log_pass "Concurrent readers receive identical results" |