qemu-io version 2.10.0(Debian 1:2.10+dfsg-0ubuntu1) Copyright (c) 2003-2017 Fabrice Bellard and the QEMU Project developers

Usage: qemu-io [OPTIONS]... [-c STRING]... [file] QEMU Disk exerciser --object OBJECTDEF define an object such as 'secret' for passwords and/or encryption keys --image-opts treat file as option string -c, --cmd STRING execute command with its arguments from the given string -f, --format FMT specifies the block driver to use -r, --read-only export read-only -s, --snapshot use snapshot file -n, --nocache disable host cache, short for -t none -m, --misalign misalign allocations for O_DIRECT -k, --native-aio use kernel AIO implementation (on Linux only) -t, --cache=MODE use the given cache mode for the image -d, --discard=MODE use the given discard mode for the image -T, --trace [[enable=]<pattern>][,events=<file>][,file=<file>] specify tracing options see qemu-img(1) man page for full description -U, --force-share force shared permissions -h, --help display this help and exit -V, --version output version information and exit See 'qemu-io -c help' for information on available commands. See <http://qemu.org/contribute/report-a-bug> for how to report bugs. More information on the QEMU project at <http://qemu.org>.