550830f935
This patch removes support for the cow file format. Normally we do not break backwards compatibility but in this case there is no impact and it is the most logical option. Extraordinary claims require extraordinary evidence so I will show why removing the cow block driver is the right thing to do. The cow file format is the disk image format for Usermode Linux, a way of running a Linux system in userspace. The performance of UML was never great and it was hacky, but it enjoyed some popularity before hardware virtualization support became mainstream. QEMU's block/cow.c is supposed to read this image file format. Unfortunately the file format was underspecified: 1. Earlier Linux versions used the MAXPATHLEN constant for the backing filename field. The value of MAXPATHLEN can change, so Linux switched to a 4096 literal but QEMU has a 1024 literal. 2. Padding was not used on the header struct (both in the Linux kernel and in QEMU) so the struct layout varied across architectures. In particular, i386 and x86_64 were different due to int64_t alignment differences. Linux now uses __attribute__((packed)), QEMU does not. Therefore: 1. QEMU cow images do not conform to the Linux cow image file format. 2. cow images cannot be shared between different host architectures. This means QEMU cow images are useless and QEMU has not had bug reports from users actually hitting these issues. Let's get rid of this thing, it serves no purpose and no one will be affected. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com> Message-id: 1410877464-20481-1-git-send-email-stefanha@redhat.com Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
431 lines
10 KiB
Bash
431 lines
10 KiB
Bash
#!/bin/bash
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#
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# Copyright (C) 2009 Red Hat, Inc.
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# Copyright (c) 2000-2005 Silicon Graphics, Inc. All Rights Reserved.
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#
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# This program is free software; you can redistribute it and/or
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# modify it under the terms of the GNU General Public License as
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# published by the Free Software Foundation.
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#
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# This program is distributed in the hope that it would be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License
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# along with this program. If not, see <http://www.gnu.org/licenses/>.
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#
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#
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# common procedures for QA scripts
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#
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_setenvironment()
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{
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MSGVERB="text:action"
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export MSGVERB
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}
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rm -f "$OUTPUT_DIR/$iam.out"
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_setenvironment
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check=${check-true}
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diff="diff -u"
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verbose=false
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group=false
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xgroup=false
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imgopts=false
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showme=false
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sortme=false
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expunge=true
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have_test_arg=false
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randomize=false
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valgrind=false
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cachemode=false
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rm -f $tmp.list $tmp.tmp $tmp.sed
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export IMGFMT=raw
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export IMGFMT_GENERIC=true
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export IMGPROTO=file
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export IMGOPTS=""
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export CACHEMODE="writeback"
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export QEMU_IO_OPTIONS=""
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export CACHEMODE_IS_DEFAULT=true
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for r
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do
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if $group
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then
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# arg after -g
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group_list=`sed -n <"$source_iotests/group" -e 's/$/ /' -e "/^[0-9][0-9][0-9].* $r /"'{
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s/ .*//p
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}'`
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if [ -z "$group_list" ]
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then
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echo "Group \"$r\" is empty or not defined?"
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exit 1
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fi
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[ ! -s $tmp.list ] && touch $tmp.list
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for t in $group_list
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do
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if grep -s "^$t\$" $tmp.list >/dev/null
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then
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:
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else
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echo "$t" >>$tmp.list
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fi
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done
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group=false
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continue
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elif $xgroup
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then
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# arg after -x
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[ ! -s $tmp.list ] && ls [0-9][0-9][0-9] [0-9][0-9][0-9][0-9] >$tmp.list 2>/dev/null
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group_list=`sed -n <"$source_iotests/group" -e 's/$/ /' -e "/^[0-9][0-9][0-9].* $r /"'{
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s/ .*//p
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}'`
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if [ -z "$group_list" ]
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then
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echo "Group \"$r\" is empty or not defined?"
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exit 1
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fi
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numsed=0
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rm -f $tmp.sed
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for t in $group_list
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do
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if [ $numsed -gt 100 ]
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then
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sed -f $tmp.sed <$tmp.list >$tmp.tmp
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mv $tmp.tmp $tmp.list
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numsed=0
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rm -f $tmp.sed
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fi
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echo "/^$t\$/d" >>$tmp.sed
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numsed=`expr $numsed + 1`
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done
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sed -f $tmp.sed <$tmp.list >$tmp.tmp
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mv $tmp.tmp $tmp.list
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xgroup=false
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continue
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elif $imgopts
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then
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IMGOPTS="$r"
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imgopts=false
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continue
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elif $cachemode
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then
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CACHEMODE="$r"
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CACHEMODE_IS_DEFAULT=false
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cachemode=false
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continue
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fi
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xpand=true
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case "$r"
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in
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-\? | -h | --help) # usage
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echo "Usage: $0 [options] [testlist]"'
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common options
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-v verbose
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check options
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-raw test raw (default)
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-bochs test bochs
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-cloop test cloop
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-parallels test parallels
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-qcow test qcow
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-qcow2 test qcow2
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-qed test qed
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-vdi test vdi
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-vpc test vpc
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-vhdx test vhdx
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-vmdk test vmdk
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-file test file (default)
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-rbd test rbd
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-sheepdog test sheepdog
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-nbd test nbd
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-ssh test ssh
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-nfs test nfs
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-archipelago test archipelago
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-xdiff graphical mode diff
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-nocache use O_DIRECT on backing file
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-misalign misalign memory allocations
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-n show me, do not run tests
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-o options -o options to pass to qemu-img create/convert
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-T output timestamps
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-r randomize test order
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-c mode cache mode
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testlist options
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-g group[,group...] include tests from these groups
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-x group[,group...] exclude tests from these groups
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NNN include test NNN
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NNN-NNN include test range (eg. 012-021)
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'
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exit 0
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;;
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-raw)
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IMGFMT=raw
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xpand=false
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;;
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-bochs)
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IMGFMT=bochs
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IMGFMT_GENERIC=false
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xpand=false
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;;
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-cloop)
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IMGFMT=cloop
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IMGFMT_GENERIC=false
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xpand=false
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;;
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-parallels)
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IMGFMT=parallels
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IMGFMT_GENERIC=false
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xpand=false
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;;
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-qcow)
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IMGFMT=qcow
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xpand=false
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;;
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-qcow2)
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IMGFMT=qcow2
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xpand=false
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;;
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-qed)
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IMGFMT=qed
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xpand=false
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;;
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-vdi)
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IMGFMT=vdi
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xpand=false
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;;
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-vmdk)
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IMGFMT=vmdk
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xpand=false
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;;
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-vpc)
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IMGFMT=vpc
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xpand=false
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;;
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-vhdx)
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IMGFMT=vhdx
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xpand=false
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;;
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-file)
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IMGPROTO=file
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xpand=false
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;;
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-rbd)
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IMGPROTO=rbd
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xpand=false
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;;
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-sheepdog)
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IMGPROTO=sheepdog
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xpand=false
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;;
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-nbd)
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IMGPROTO=nbd
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xpand=false
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;;
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-ssh)
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IMGPROTO=ssh
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xpand=false
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;;
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-nfs)
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IMGPROTO=nfs
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xpand=false
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;;
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-archipelago)
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IMGPROTO=archipelago
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xpand=false
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;;
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-nocache)
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CACHEMODE="none"
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CACHEMODE_IS_DEFAULT=false
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xpand=false
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;;
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-misalign)
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QEMU_IO_OPTIONS="$QEMU_IO_OPTIONS --misalign"
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xpand=false
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;;
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-valgrind)
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valgrind=true
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xpand=false
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;;
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-g) # -g group ... pick from group file
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group=true
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xpand=false
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;;
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-xdiff) # graphical diff mode
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xpand=false
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if [ ! -z "$DISPLAY" ]
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then
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which xdiff >/dev/null 2>&1 && diff=xdiff
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which gdiff >/dev/null 2>&1 && diff=gdiff
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which tkdiff >/dev/null 2>&1 && diff=tkdiff
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which xxdiff >/dev/null 2>&1 && diff=xxdiff
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fi
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;;
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-n) # show me, don't do it
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showme=true
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xpand=false
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;;
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-o)
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imgopts=true
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xpand=false
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;;
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-c)
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cachemode=true
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xpand=false
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;;
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-r) # randomize test order
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randomize=true
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xpand=false
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;;
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-T) # turn on timestamp output
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timestamp=true
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xpand=false
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;;
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-v)
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verbose=true
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xpand=false
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;;
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-x) # -x group ... exclude from group file
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xgroup=true
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xpand=false
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;;
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'[0-9][0-9][0-9] [0-9][0-9][0-9][0-9]')
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echo "No tests?"
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status=1
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exit $status
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;;
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[0-9]*-[0-9]*)
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eval `echo $r | sed -e 's/^/start=/' -e 's/-/ end=/'`
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;;
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[0-9]*-)
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eval `echo $r | sed -e 's/^/start=/' -e 's/-//'`
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end=`echo [0-9][0-9][0-9] [0-9][0-9][0-9][0-9] | sed -e 's/\[0-9]//g' -e 's/ *$//' -e 's/.* //'`
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if [ -z "$end" ]
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then
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echo "No tests in range \"$r\"?"
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status=1
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exit $status
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fi
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;;
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*)
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start=$r
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end=$r
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;;
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esac
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# get rid of leading 0s as can be interpreted as octal
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start=`echo $start | sed 's/^0*//'`
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end=`echo $end | sed 's/^0*//'`
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if $xpand
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then
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have_test_arg=true
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$AWK_PROG </dev/null '
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BEGIN { for (t='$start'; t<='$end'; t++) printf "%03d\n",t }' \
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| while read id
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do
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if grep -s "^$id " "$source_iotests/group" >/dev/null
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then
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# in group file ... OK
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echo $id >>$tmp.list
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else
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if [ -f expunged ] && $expunge && egrep "^$id([ ]|\$)" expunged >/dev/null
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then
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# expunged ... will be reported, but not run, later
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echo $id >>$tmp.list
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else
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# oops
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echo "$id - unknown test, ignored"
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fi
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fi
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done
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fi
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done
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# Set qemu-io cache mode with $CACHEMODE we have
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QEMU_IO_OPTIONS="$QEMU_IO_OPTIONS --cache $CACHEMODE"
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# Set default options for qemu-img create -o if they were not specified
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_set_default_imgopts
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if [ -s $tmp.list ]
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then
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# found some valid test numbers ... this is good
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:
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else
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if $have_test_arg
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then
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# had test numbers, but none in group file ... do nothing
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touch $tmp.list
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else
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# no test numbers, do everything from group file
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sed -n -e '/^[0-9][0-9][0-9]*/s/[ ].*//p' <"$source_iotests/group" >$tmp.list
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fi
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fi
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# should be sort -n, but this did not work for Linux when this
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# was ported from IRIX
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#
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list=`sort $tmp.list`
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rm -f $tmp.list $tmp.tmp $tmp.sed
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if $randomize
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then
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list=`echo $list | awk -f randomize.awk`
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fi
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[ "$QEMU" = "" ] && _fatal "qemu not found"
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[ "$QEMU_IMG" = "" ] && _fatal "qemu-img not found"
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[ "$QEMU_IO" = "" ] && _fatal "qemu-io not found"
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if [ "$IMGPROTO" = "nbd" ] ; then
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[ "$QEMU_NBD" = "" ] && _fatal "qemu-nbd not found"
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fi
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if $valgrind; then
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export REAL_QEMU_IO="$QEMU_IO_PROG"
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export QEMU_IO_PROG=valgrind_qemu_io
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fi
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