rbd: Detect rbd image resizes and propagate them

Message ID 20170913164424.32129-1-awg@digitalocean.com
State New
Headers show
Series
  • rbd: Detect rbd image resizes and propagate them
Related show

Commit Message

Adam Wolfe Gordon via Qemu-devel Sept. 13, 2017, 4:44 p.m.
Register a watcher with rbd so that we get notified when an image is
resized. Propagate resizes to parent block devices so that guest devices
get resized without user intervention.

Signed-off-by: Adam Wolfe Gordon <awg@digitalocean.com>
---
Hello!

We are using this patch in production at DigitalOcean and have tested it fairly
extensively. However, we use the same block device configuration everywhere, so
I'd be interested to get an answer to the question I've left in the code:

> /* NOTE: This assumes there's only one layer between us and the
>    block-backend. Is this always true? */

If that isn't true, this patch will need a bit of work to traverse up the block
device tree and find the block-backend.

Of course, any other feedback would be welcome too - this is my first foray into
the qemu code.

Regards,
Adam

 block/rbd.c | 80 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 80 insertions(+)

Comments

no-reply@patchew.org Sept. 13, 2017, 8:22 p.m. | #1
Hi,

This series seems to have some coding style problems. See output below for
more information:

Subject: [Qemu-devel] [PATCH] rbd: Detect rbd image resizes and propagate them
Message-id: 20170913164424.32129-1-awg@digitalocean.com
Type: series

=== TEST SCRIPT BEGIN ===
#!/bin/bash

BASE=base
n=1
total=$(git log --oneline $BASE.. | wc -l)
failed=0

git config --local diff.renamelimit 0
git config --local diff.renames True

commits="$(git log --format=%H --reverse $BASE..)"
for c in $commits; do
    echo "Checking PATCH $n/$total: $(git log -n 1 --format=%s $c)..."
    if ! git show $c --format=email | ./scripts/checkpatch.pl --mailback -; then
        failed=1
        echo
    fi
    n=$((n+1))
done

exit $failed
=== TEST SCRIPT END ===

Updating 3c8cf5a9c21ff8782164d1def7f44bd888713384
From https://github.com/patchew-project/qemu
 t [tag update]            patchew/1505298088-10878-1-git-send-email-thuth@redhat.com -> patchew/1505298088-10878-1-git-send-email-thuth@redhat.com
 * [new tag]               patchew/20170913164424.32129-1-awg@digitalocean.com -> patchew/20170913164424.32129-1-awg@digitalocean.com
Switched to a new branch 'test'
c0e97b7e5b rbd: Detect rbd image resizes and propagate them

=== OUTPUT BEGIN ===
Checking PATCH 1/1: rbd: Detect rbd image resizes and propagate them...
WARNING: line over 80 characters
#57: FILE: block/rbd.c:572:
+        error_report("bs %s does not have parent", bdrv_get_device_or_node_name(bs));

ERROR: line over 90 characters
#66: FILE: block/rbd.c:581:
+        error_report("getlength failed on parent %s", bdrv_get_device_or_node_name(parent));

total: 1 errors, 1 warnings, 107 lines checked

Your patch has style problems, please review.  If any of these errors
are false positives report them to the maintainer, see
CHECKPATCH in MAINTAINERS.

=== OUTPUT END ===

Test command exited with code: 1


---
Email generated automatically by Patchew [http://patchew.org/].
Please send your feedback to patchew-devel@freelists.org
no-reply@patchew.org Sept. 13, 2017, 8:22 p.m. | #2
Hi,

This series failed build test on s390x host. Please find the details below.

Subject: [Qemu-devel] [PATCH] rbd: Detect rbd image resizes and propagate them
Message-id: 20170913164424.32129-1-awg@digitalocean.com
Type: series

=== TEST SCRIPT BEGIN ===
#!/bin/bash
# Testing script will be invoked under the git checkout with
# HEAD pointing to a commit that has the patches applied on top of "base"
# branch
set -e
echo "=== ENV ==="
env
echo "=== PACKAGES ==="
rpm -qa
echo "=== TEST BEGIN ==="
CC=$HOME/bin/cc
INSTALL=$PWD/install
BUILD=$PWD/build
echo -n "Using CC: "
realpath $CC
mkdir -p $BUILD $INSTALL
SRC=$PWD
cd $BUILD
$SRC/configure --cc=$CC --prefix=$INSTALL
make -j4
# XXX: we need reliable clean up
# make check -j4 V=1
make install
=== TEST SCRIPT END ===

Updating 3c8cf5a9c21ff8782164d1def7f44bd888713384
From https://github.com/patchew-project/qemu
 - [tag update]      patchew/1505298088-10878-1-git-send-email-thuth@redhat.com -> patchew/1505298088-10878-1-git-send-email-thuth@redhat.com
 * [new tag]         patchew/20170913164424.32129-1-awg@digitalocean.com -> patchew/20170913164424.32129-1-awg@digitalocean.com
Switched to a new branch 'test'
c0e97b7 rbd: Detect rbd image resizes and propagate them

=== OUTPUT BEGIN ===
=== ENV ===
XDG_SESSION_ID=862
SHELL=/bin/sh
USER=fam
PATCHEW=/home/fam/patchew/patchew-cli -s http://patchew.org --nodebug
PATH=/usr/bin:/bin
PWD=/var/tmp/patchew-tester-tmp-ihkih90_/src
LANG=en_US.UTF-8
HOME=/home/fam
SHLVL=2
LOGNAME=fam
DBUS_SESSION_BUS_ADDRESS=unix:path=/run/user/1012/bus
XDG_RUNTIME_DIR=/run/user/1012
_=/usr/bin/env
=== PACKAGES ===
gpg-pubkey-873529b8-54e386ff
xz-libs-5.2.2-2.fc24.s390x
libxshmfence-1.2-3.fc24.s390x
giflib-4.1.6-15.fc24.s390x
trousers-lib-0.3.13-6.fc24.s390x
ncurses-base-6.0-6.20160709.fc25.noarch
gmp-6.1.1-1.fc25.s390x
libidn-1.33-1.fc25.s390x
slang-2.3.0-7.fc25.s390x
pkgconfig-0.29.1-1.fc25.s390x
alsa-lib-1.1.1-2.fc25.s390x
yum-metadata-parser-1.1.4-17.fc25.s390x
python3-slip-dbus-0.6.4-4.fc25.noarch
python2-cssselect-0.9.2-1.fc25.noarch
createrepo_c-libs-0.10.0-6.fc25.s390x
initscripts-9.69-1.fc25.s390x
parted-3.2-21.fc25.s390x
flex-2.6.0-3.fc25.s390x
colord-libs-1.3.4-1.fc25.s390x
python-osbs-client-0.33-3.fc25.noarch
perl-Pod-Simple-3.35-1.fc25.noarch
python2-simplejson-3.10.0-1.fc25.s390x
brltty-5.4-2.fc25.s390x
librados2-10.2.4-2.fc25.s390x
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libuuid-2.28.2-2.fc25.s390x
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libbasicobjects-0.1.1-29.fc25.s390x
libradosstriper1-10.2.4-2.fc25.s390x
libXxf86vm-devel-1.1.4-3.fc24.s390x
zziplib-0.13.62-7.fc24.s390x
libpaper-1.1.24-12.fc24.s390x
libini_config-1.3.0-29.fc25.s390x
snappy-devel-1.1.3-2.fc24.s390x
libcap-ng-devel-0.7.8-1.fc25.s390x
libxkbcommon-devel-0.7.1-1.fc25.s390x
openssl-libs-1.0.2k-1.fc25.s390x
util-linux-2.28.2-2.fc25.s390x
texlive-etoolbox-svn38031.2.2a-33.fc25.1.noarch
texlive-dvips-svn41149-33.fc25.1.noarch
texlive-latexconfig-svn40274-33.fc25.1.noarch
texlive-tex-ini-files-svn40533-33.fc25.1.noarch
texlive-qstest-svn15878.0-33.fc25.1.noarch
texlive-cmap-svn41168-33.fc25.1.noarch
texlive-luatex-bin-svn41091-33.20160520.fc25.1.s390x
texlive-mflogo-svn38628-33.fc25.1.noarch
texlive-sansmath-svn17997.1.1-33.fc25.1.noarch
texlive-unicode-data-svn39808-33.fc25.1.noarch
texlive-luaotfload-bin-svn34647.0-33.20160520.fc25.1.noarch
texlive-listings-svn37534.1.6-33.fc25.1.noarch
texlive-pstricks-svn41321-33.fc25.1.noarch
texlive-metalogo-svn18611.0.12-33.fc25.1.noarch
texlive-collection-latex-svn41011-33.20160520.fc25.1.noarch
python2-dnf-plugins-core-0.1.21-5.fc25.noarch
xkeyboard-config-2.20-2.fc25.noarch
perl-Test-Harness-3.39-1.fc25.noarch
systemd-libs-231-17.fc25.s390x
python3-pycparser-2.14-7.fc25.noarch
kernel-devel-4.11.10-200.fc25.s390x
gsm-1.0.17-1.fc25.s390x
python-2.7.13-2.fc25.s390x
kernel-4.11.10-200.fc25.s390x
rpmconf-1.0.19-1.fc25.noarch
teamd-1.27-1.fc25.s390x
jasper-libs-1.900.13-4.fc25.s390x
glusterfs-libs-3.10.5-1.fc25.s390x
libcrypt-nss-2.24-10.fc25.s390x
emacs-common-25.2-3.fc25.s390x
pango-devel-1.40.7-1.fc25.s390x
libcurl-7.51.0-9.fc25.s390x
vim-common-8.0.885-1.fc25.s390x
java-1.8.0-openjdk-1.8.0.144-5.b01.fc25.s390x
gcc-go-6.4.1-1.fc25.s390x
nss-tools-3.31.0-1.1.fc25.s390x
perl-XML-XPath-1.39-2.fc25.noarch
python2-sphinx_rtd_theme-0.1.9-2.fc24.noarch
libxml2-devel-2.9.4-2.fc25.s390x
libattr-2.4.47-16.fc24.s390x
libvisual-0.4.0-20.fc24.s390x
libpcap-1.7.4-2.fc24.s390x
libutempter-1.1.6-8.fc24.s390x
libgudev-230-3.fc24.s390x
popt-devel-1.16-7.fc24.s390x
hicolor-icon-theme-0.15-3.fc24.noarch
setup-2.10.4-1.fc25.noarch
bash-4.3.43-4.fc25.s390x
libjpeg-turbo-1.5.1-0.fc25.s390x
perl-Socket-2.024-1.fc25.s390x
perl-HTTP-Tiny-0.070-1.fc25.noarch
ipset-6.29-1.fc25.s390x
python2-setuptools-25.1.1-1.fc25.noarch
gsettings-desktop-schemas-3.22.0-1.fc25.s390x
python3-setuptools-25.1.1-1.fc25.noarch
python-slip-dbus-0.6.4-4.fc25.noarch
python2-ply-3.8-2.fc25.noarch
dtc-1.4.2-1.fc25.s390x
guile-2.0.13-1.fc25.s390x
cronie-anacron-1.5.1-2.fc25.s390x
libXtst-1.2.3-1.fc25.s390x
iso-codes-3.70-1.fc25.noarch
s390utils-1.36.0-1.fc25.s390x
python-backports-ssl_match_hostname-3.5.0.1-3.fc25.noarch
fedora-cert-0.6.0.1-1.fc25.noarch
dnf-plugin-system-upgrade-0.7.1-4.fc25.noarch
lvm2-2.02.167-3.fc25.s390x
libselinux-devel-2.5-13.fc25.s390x
perl-Time-Local-1.250-1.fc25.noarch
libradosstriper-devel-10.2.4-2.fc25.s390x
flac-libs-1.3.2-1.fc25.s390x
perl-Digest-1.17-366.fc25.noarch
teckit-2.5.1-15.fc24.s390x
libpath_utils-0.2.1-29.fc25.s390x
attr-2.4.47-16.fc24.s390x
usbredir-0.7.1-2.fc24.s390x
cairo-devel-1.14.8-1.fc25.s390x
lzo-devel-2.08-8.fc24.s390x
libcap-devel-2.25-2.fc25.s390x
libbsd-0.8.3-1.fc25.s390x
texlive-url-svn32528.3.4-33.fc25.1.noarch
texlive-dvips-bin-svn40987-33.20160520.fc25.1.s390x
texlive-index-svn24099.4.1beta-33.fc25.1.noarch
texlive-setspace-svn24881.6.7a-33.fc25.1.noarch
texlive-mathtools-svn38833-33.fc25.1.noarch
texlive-cm-svn32865.0-33.fc25.1.noarch
texlive-graphics-def-svn41879-33.fc25.1.noarch
texlive-mdwtools-svn15878.1.05.4-33.fc25.1.noarch
texlive-rsfs-svn15878.0-33.fc25.1.noarch
texlive-ucharcat-svn38907-33.fc25.1.noarch
texlive-fontspec-svn41262-33.fc25.1.noarch
texlive-showexpl-svn32737.v0.3l-33.fc25.1.noarch
texlive-pstricks-add-svn40744-33.fc25.1.noarch
texlive-beamer-svn36461.3.36-33.fc25.1.noarch
texlive-collection-basic-svn41149-33.20160520.fc25.1.noarch
xemacs-filesystem-21.5.34-20.20170124hgf412e9f093d4.fc25.noarch
hawkey-0.6.4-3.fc25.s390x
bluez-libs-5.44-1.fc25.s390x
audit-libs-2.7.7-1.fc25.s390x
iproute-4.11.0-1.fc25.s390x
libICE-1.0.9-9.fc25.s390x
python3-ply-3.8-2.fc25.noarch
perl-5.24.2-387.fc25.s390x
graphite2-1.3.10-1.fc25.s390x
vte-profile-0.46.2-1.fc25.s390x
python-libs-2.7.13-2.fc25.s390x
mesa-libGL-17.0.5-3.fc25.s390x
python2-pycurl-7.43.0-6.fc25.s390x
NetworkManager-1.4.4-5.fc25.s390x
mesa-libEGL-devel-17.0.5-3.fc25.s390x
mesa-libGLES-devel-17.0.5-3.fc25.s390x
hostname-3.15-8.fc25.s390x
nss-util-3.31.0-1.0.fc25.s390x
nss-softokn-freebl-3.31.0-1.0.fc25.s390x
glibc-headers-2.24-10.fc25.s390x
glusterfs-cli-3.10.5-1.fc25.s390x
git-core-2.9.5-1.fc25.s390x
selinux-policy-3.13.1-225.20.fc25.noarch
mock-1.4.3-1.fc25.noarch
gcc-gfortran-6.4.1-1.fc25.s390x
webkitgtk4-plugin-process-gtk2-2.16.6-1.fc25.s390x
perl-Module-CoreList-5.20170821-1.fc25.noarch
python2-pbr-1.10.0-1.fc25.noarch
libtool-2.4.6-14.fc25.s390x
gpg-pubkey-a0a7badb-52844296
readline-6.3-8.fc24.s390x
cpio-2.12-3.fc24.s390x
libXcomposite-0.4.4-8.fc24.s390x
procps-ng-3.3.10-11.fc24.s390x
GConf2-3.2.6-16.fc24.s390x
xz-devel-5.2.2-2.fc24.s390x
fedora-logos-22.0.0-3.fc24.s390x
gpg-pubkey-e372e838-56fd7943
kmod-libs-23-1.fc25.s390x
perl-parent-0.236-1.fc25.noarch
perl-TermReadKey-2.37-1.fc25.s390x
ncurses-c++-libs-6.0-6.20160709.fc25.s390x
gzip-1.8-1.fc25.s390x
python3-gobject-base-3.22.0-1.fc25.s390x
python2-yubico-1.3.2-3.fc25.noarch
s390utils-ziomon-1.36.0-1.fc25.s390x
librepo-1.7.18-3.fc25.s390x
gnat-srpm-macros-4-1.fc25.noarch
python-decoratortools-1.8-12.fc25.noarch
m17n-db-1.7.0-7.fc25.noarch
e2fsprogs-libs-1.43.3-1.fc25.s390x
libvorbis-1.3.5-1.fc25.s390x
npth-1.3-1.fc25.s390x
libcephfs1-10.2.4-2.fc25.s390x
wayland-devel-1.12.0-1.fc25.s390x
libxcb-devel-1.12-1.fc25.s390x
perl-encoding-2.19-5.fc25.s390x
python3-cssselect-0.9.2-1.fc25.noarch
gettext-libs-0.19.8.1-3.fc25.s390x
at-spi2-atk-devel-2.22.0-1.fc25.s390x
virglrenderer-0.5.0-1.20160411git61846f92f.fc25.s390x
pixman-devel-0.34.0-2.fc24.s390x
libnfs-devel-1.9.8-2.fc24.s390x
libblkid-2.28.2-2.fc25.s390x
glib2-devel-2.50.3-1.fc25.s390x
texlive-ifxetex-svn19685.0.5-33.fc25.1.noarch
texlive-caption-svn41409-33.fc25.1.noarch
texlive-float-svn15878.1.3d-33.fc25.1.noarch
texlive-pdftex-def-svn22653.0.06d-33.fc25.1.noarch
texlive-xdvi-bin-svn40750-33.20160520.fc25.1.s390x
texlive-beton-svn15878.0-33.fc25.1.noarch
texlive-filecontents-svn24250.1.3-33.fc25.1.noarch
texlive-lm-math-svn36915.1.959-33.fc25.1.noarch
texlive-pslatex-svn16416.0-33.fc25.1.noarch
texlive-times-svn35058.0-33.fc25.1.noarch
texlive-breakurl-svn29901.1.40-33.fc25.1.noarch
texlive-filehook-svn24280.0.5d-33.fc25.1.noarch
texlive-pst-pdf-svn31660.1.1v-33.fc25.1.noarch
texlive-seminar-svn34011.1.62-33.fc25.1.noarch
texlive-xetexconfig-svn41133-33.fc25.1.noarch
python-rpm-macros-3-12.fc25.noarch
nss-pem-1.0.3-3.fc25.s390x
at-spi2-core-2.22.1-1.fc25.s390x
kernel-devel-4.10.8-200.fc25.s390x
perl-Scalar-List-Utils-1.48-1.fc25.s390x
libtasn1-devel-4.12-1.fc25.s390x
python3-koji-1.13.0-2.fc25.noarch
opus-1.1.5-1.fc25.s390x
elfutils-libs-0.169-1.fc25.s390x
kernel-core-4.11.10-200.fc25.s390x
gnutls-dane-3.5.14-1.fc25.s390x
systemd-container-231-17.fc25.s390x
sudo-1.8.20p2-1.fc25.s390x
libicu-devel-57.1-5.fc25.s390x
js-jquery-2.2.4-3.fc25.noarch
krb5-libs-1.14.4-8.fc25.s390x
apr-1.6.2-1.fc25.s390x
kernel-headers-4.12.9-200.fc25.s390x
dbus-1.11.16-1.fc25.s390x
libdrm-2.4.82-1.fc25.s390x
pcre2-utf32-10.23-9.fc25.s390x
copy-jdk-configs-2.3-1.fc25.noarch
libdrm-devel-2.4.82-1.fc25.s390x
krb5-workstation-1.14.4-8.fc25.s390x
python3-sssdconfig-1.15.3-1.fc25.noarch
python2-docutils-0.13.1-3.fc25.noarch
graphviz-2.38.0-39.fc25.s390x
=== TEST BEGIN ===
Using CC: /home/fam/bin/cc
Install prefix    /var/tmp/patchew-tester-tmp-ihkih90_/src/install
BIOS directory    /var/tmp/patchew-tester-tmp-ihkih90_/src/install/share/qemu
binary directory  /var/tmp/patchew-tester-tmp-ihkih90_/src/install/bin
library directory /var/tmp/patchew-tester-tmp-ihkih90_/src/install/lib
module directory  /var/tmp/patchew-tester-tmp-ihkih90_/src/install/lib/qemu
libexec directory /var/tmp/patchew-tester-tmp-ihkih90_/src/install/libexec
include directory /var/tmp/patchew-tester-tmp-ihkih90_/src/install/include
config directory  /var/tmp/patchew-tester-tmp-ihkih90_/src/install/etc
local state directory   /var/tmp/patchew-tester-tmp-ihkih90_/src/install/var
Manual directory  /var/tmp/patchew-tester-tmp-ihkih90_/src/install/share/man
ELF interp prefix /usr/gnemul/qemu-%M
Source path       /var/tmp/patchew-tester-tmp-ihkih90_/src
C compiler        /home/fam/bin/cc
Host C compiler   cc
C++ compiler      c++
Objective-C compiler /home/fam/bin/cc
ARFLAGS           rv
CFLAGS            -O2 -U_FORTIFY_SOURCE -D_FORTIFY_SOURCE=2 -g 
QEMU_CFLAGS       -I/usr/include/pixman-1  -Werror -DHAS_LIBSSH2_SFTP_FSYNC -pthread -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -DNCURSES_WIDECHAR -D_GNU_SOURCE -m64 -D_GNU_SOURCE -D_FILE_OFFSET_BITS=64 -D_LARGEFILE_SOURCE -Wstrict-prototypes -Wredundant-decls -Wall -Wundef -Wwrite-strings -Wmissing-prototypes -fno-strict-aliasing -fno-common -fwrapv  -Wendif-labels -Wno-shift-negative-value -Wno-missing-include-dirs -Wempty-body -Wnested-externs -Wformat-security -Wformat-y2k -Winit-self -Wignored-qualifiers -Wold-style-declaration -Wold-style-definition -Wtype-limits -fstack-protector-strong -I/usr/include/p11-kit-1    -I/usr/include/libpng16 -I/usr/include/libdrm  -I/usr/include/cacard -I/usr/include/nss3 -I/usr/include/nspr4 -I/usr/include/glib-2.0 -I/usr/lib64/glib-2.0/include -I/usr/include/libusb-1.0 
LDFLAGS           -Wl,--warn-common -m64 -g 
make              make
install           install
python            python -B
smbd              /usr/sbin/smbd
module support    no
host CPU          s390x
host big endian   yes
target list       aarch64-softmmu alpha-softmmu arm-softmmu cris-softmmu i386-softmmu lm32-softmmu m68k-softmmu microblazeel-softmmu microblaze-softmmu mips64el-softmmu mips64-softmmu mipsel-softmmu mips-softmmu moxie-softmmu nios2-softmmu or1k-softmmu ppc64-softmmu ppcemb-softmmu ppc-softmmu s390x-softmmu sh4eb-softmmu sh4-softmmu sparc64-softmmu sparc-softmmu tricore-softmmu unicore32-softmmu x86_64-softmmu xtensaeb-softmmu xtensa-softmmu aarch64-linux-user alpha-linux-user armeb-linux-user arm-linux-user cris-linux-user hppa-linux-user i386-linux-user m68k-linux-user microblazeel-linux-user microblaze-linux-user mips64el-linux-user mips64-linux-user mipsel-linux-user mips-linux-user mipsn32el-linux-user mipsn32-linux-user nios2-linux-user or1k-linux-user ppc64abi32-linux-user ppc64le-linux-user ppc64-linux-user ppc-linux-user s390x-linux-user sh4eb-linux-user sh4-linux-user sparc32plus-linux-user sparc64-linux-user sparc-linux-user tilegx-linux-user x86_64-linux-user
gprof enabled     no
sparse enabled    no
strip binaries    yes
profiler          no
static build      no
pixman            system
SDL support       yes (2.0.5)
GTK support       yes (3.22.17)
GTK GL support    yes
VTE support       yes (0.46.2)
TLS priority      NORMAL
GNUTLS support    yes
GNUTLS rnd        yes
libgcrypt         no
libgcrypt kdf     no
nettle            yes (3.3)
nettle kdf        yes
libtasn1          yes
curses support    yes
virgl support     yes
curl support      yes
mingw32 support   no
Audio drivers     oss
Block whitelist (rw) 
Block whitelist (ro) 
VirtFS support    yes
VNC support       yes
VNC SASL support  yes
VNC JPEG support  yes
VNC PNG support   yes
xen support       no
brlapi support    yes
bluez  support    yes
Documentation     yes
PIE               no
vde support       no
netmap support    no
Linux AIO support yes
ATTR/XATTR support yes
Install blobs     yes
KVM support       yes
HAX support       no
TCG support       yes
TCG debug enabled no
TCG interpreter   no
RDMA support      no
fdt support       yes
preadv support    yes
fdatasync         yes
madvise           yes
posix_madvise     yes
libcap-ng support yes
vhost-net support yes
vhost-scsi support yes
vhost-vsock support yes
vhost-user support yes
Trace backends    log
spice support     no 
rbd support       yes
xfsctl support    no
smartcard support yes
libusb            yes
usb net redir     yes
OpenGL support    yes
OpenGL dmabufs    yes
libiscsi support  yes
libnfs support    yes
build guest agent yes
QGA VSS support   no
QGA w32 disk info no
QGA MSI support   no
seccomp support   no
coroutine backend ucontext
coroutine pool    yes
debug stack usage no
crypto afalg      no
GlusterFS support yes
gcov              gcov
gcov enabled      no
TPM support       yes
libssh2 support   yes
TPM passthrough   no
QOM debugging     yes
Live block migration yes
lzo support       yes
snappy support    yes
bzip2 support     yes
NUMA host support no
tcmalloc support  no
jemalloc support  no
avx2 optimization no
replication support yes
VxHS block device no
  GEN     aarch64-softmmu/config-devices.mak.tmp
  GEN     alpha-softmmu/config-devices.mak.tmp
  GEN     arm-softmmu/config-devices.mak.tmp
  GEN     cris-softmmu/config-devices.mak.tmp
  GEN     cris-softmmu/config-devices.mak
  GEN     alpha-softmmu/config-devices.mak
  GEN     i386-softmmu/config-devices.mak.tmp
  GEN     arm-softmmu/config-devices.mak
  GEN     lm32-softmmu/config-devices.mak.tmp
  GEN     aarch64-softmmu/config-devices.mak
  GEN     m68k-softmmu/config-devices.mak.tmp
  GEN     microblazeel-softmmu/config-devices.mak.tmp
  GEN     lm32-softmmu/config-devices.mak
  GEN     m68k-softmmu/config-devices.mak
  GEN     i386-softmmu/config-devices.mak
  GEN     microblaze-softmmu/config-devices.mak.tmp
  GEN     mips64el-softmmu/config-devices.mak.tmp
  GEN     mips64-softmmu/config-devices.mak.tmp
  GEN     microblazeel-softmmu/config-devices.mak
  GEN     mipsel-softmmu/config-devices.mak.tmp
  GEN     microblaze-softmmu/config-devices.mak
  GEN     mips-softmmu/config-devices.mak.tmp
  GEN     mips64el-softmmu/config-devices.mak
  GEN     moxie-softmmu/config-devices.mak.tmp
  GEN     mips64-softmmu/config-devices.mak
  GEN     nios2-softmmu/config-devices.mak.tmp
  GEN     mipsel-softmmu/config-devices.mak
  GEN     mips-softmmu/config-devices.mak
  GEN     moxie-softmmu/config-devices.mak
  GEN     or1k-softmmu/config-devices.mak.tmp
  GEN     nios2-softmmu/config-devices.mak
  GEN     ppc64-softmmu/config-devices.mak.tmp
  GEN     ppcemb-softmmu/config-devices.mak.tmp
  GEN     ppc-softmmu/config-devices.mak.tmp
  GEN     or1k-softmmu/config-devices.mak
  GEN     s390x-softmmu/config-devices.mak.tmp
  GEN     ppc64-softmmu/config-devices.mak
  GEN     s390x-softmmu/config-devices.mak
  GEN     ppcemb-softmmu/config-devices.mak
  GEN     sh4-softmmu/config-devices.mak.tmp
  GEN     sh4eb-softmmu/config-devices.mak.tmp
  GEN     ppc-softmmu/config-devices.mak
  GEN     sparc64-softmmu/config-devices.mak.tmp
  GEN     sparc-softmmu/config-devices.mak.tmp
  GEN     sh4eb-softmmu/config-devices.mak
  GEN     sparc-softmmu/config-devices.mak
  GEN     sparc64-softmmu/config-devices.mak
  GEN     tricore-softmmu/config-devices.mak.tmp
  GEN     unicore32-softmmu/config-devices.mak.tmp
  GEN     x86_64-softmmu/config-devices.mak.tmp
  GEN     sh4-softmmu/config-devices.mak
  GEN     xtensaeb-softmmu/config-devices.mak.tmp
  GEN     tricore-softmmu/config-devices.mak
  GEN     unicore32-softmmu/config-devices.mak
  GEN     xtensa-softmmu/config-devices.mak.tmp
  GEN     aarch64-linux-user/config-devices.mak.tmp
  GEN     x86_64-softmmu/config-devices.mak
  GEN     xtensaeb-softmmu/config-devices.mak
  GEN     armeb-linux-user/config-devices.mak.tmp
  GEN     alpha-linux-user/config-devices.mak.tmp
  GEN     aarch64-linux-user/config-devices.mak
  GEN     xtensa-softmmu/config-devices.mak
  GEN     alpha-linux-user/config-devices.mak
  GEN     arm-linux-user/config-devices.mak.tmp
  GEN     cris-linux-user/config-devices.mak.tmp
  GEN     armeb-linux-user/config-devices.mak
  GEN     hppa-linux-user/config-devices.mak.tmp
  GEN     i386-linux-user/config-devices.mak.tmp
  GEN     cris-linux-user/config-devices.mak
  GEN     arm-linux-user/config-devices.mak
  GEN     m68k-linux-user/config-devices.mak.tmp
  GEN     hppa-linux-user/config-devices.mak
  GEN     microblazeel-linux-user/config-devices.mak.tmp
  GEN     i386-linux-user/config-devices.mak
  GEN     microblaze-linux-user/config-devices.mak.tmp
  GEN     mips64el-linux-user/config-devices.mak.tmp
  GEN     m68k-linux-user/config-devices.mak
  GEN     mips64-linux-user/config-devices.mak.tmp
  GEN     microblazeel-linux-user/config-devices.mak
  GEN     microblaze-linux-user/config-devices.mak
  GEN     mipsel-linux-user/config-devices.mak.tmp
  GEN     mips64el-linux-user/config-devices.mak
  GEN     mips-linux-user/config-devices.mak.tmp
  GEN     mips64-linux-user/config-devices.mak
  GEN     mipsn32el-linux-user/config-devices.mak.tmp
  GEN     mipsn32-linux-user/config-devices.mak.tmp
  GEN     mipsel-linux-user/config-devices.mak
  GEN     nios2-linux-user/config-devices.mak.tmp
  GEN     mips-linux-user/config-devices.mak
  GEN     mipsn32el-linux-user/config-devices.mak
  GEN     mipsn32-linux-user/config-devices.mak
  GEN     or1k-linux-user/config-devices.mak.tmp
  GEN     ppc64abi32-linux-user/config-devices.mak.tmp
  GEN     ppc64le-linux-user/config-devices.mak.tmp
  GEN     nios2-linux-user/config-devices.mak
  GEN     or1k-linux-user/config-devices.mak
  GEN     ppc64-linux-user/config-devices.mak.tmp
  GEN     ppc-linux-user/config-devices.mak.tmp
  GEN     ppc64abi32-linux-user/config-devices.mak
  GEN     ppc64le-linux-user/config-devices.mak
  GEN     s390x-linux-user/config-devices.mak.tmp
  GEN     ppc64-linux-user/config-devices.mak
  GEN     sh4eb-linux-user/config-devices.mak.tmp
  GEN     sh4-linux-user/config-devices.mak.tmp
  GEN     ppc-linux-user/config-devices.mak
  GEN     sparc32plus-linux-user/config-devices.mak.tmp
  GEN     s390x-linux-user/config-devices.mak
  GEN     sh4eb-linux-user/config-devices.mak
  GEN     sh4-linux-user/config-devices.mak
  GEN     sparc64-linux-user/config-devices.mak.tmp
  GEN     sparc-linux-user/config-devices.mak.tmp
  GEN     sparc32plus-linux-user/config-devices.mak
  GEN     tilegx-linux-user/config-devices.mak.tmp
  GEN     x86_64-linux-user/config-devices.mak.tmp
  GEN     tilegx-linux-user/config-devices.mak
  GEN     sparc64-linux-user/config-devices.mak
  GEN     sparc-linux-user/config-devices.mak
  GEN     qemu-options.def
  GEN     config-host.h
  GEN     x86_64-linux-user/config-devices.mak
  GEN     qmp-commands.h
  GEN     qapi-types.h
  GEN     qapi-visit.h
  GEN     qapi-event.h
  GEN     qmp-marshal.c
  GEN     qapi-types.c
  GEN     qapi-visit.c
  GEN     qapi-event.c
  GEN     qmp-introspect.h
  GEN     qmp-introspect.c
  GEN     trace/generated-tcg-tracers.h
  GEN     trace/generated-helpers.h
  GEN     trace/generated-helpers-wrappers.h
  GEN     trace/generated-helpers.c
  GEN     module_block.h
  GEN     tests/test-qapi-types.h
  GEN     tests/test-qapi-visit.h
  GEN     tests/test-qmp-commands.h
  GEN     tests/test-qapi-event.h
  GEN     tests/test-qmp-introspect.h
  GEN     trace-root.h
  GEN     util/trace.h
  GEN     crypto/trace.h
  GEN     io/trace.h
  GEN     migration/trace.h
  GEN     block/trace.h
  GEN     chardev/trace.h
  GEN     hw/block/trace.h
  GEN     hw/block/dataplane/trace.h
  GEN     hw/char/trace.h
  GEN     hw/intc/trace.h
  GEN     hw/net/trace.h
  GEN     hw/virtio/trace.h
  GEN     hw/audio/trace.h
  GEN     hw/misc/trace.h
  GEN     hw/usb/trace.h
  GEN     hw/scsi/trace.h
  GEN     hw/nvram/trace.h
  GEN     hw/display/trace.h
  GEN     hw/input/trace.h
  GEN     hw/timer/trace.h
  GEN     hw/dma/trace.h
  GEN     hw/sparc/trace.h
  GEN     hw/sd/trace.h
  GEN     hw/isa/trace.h
  GEN     hw/mem/trace.h
  GEN     hw/i386/trace.h
  GEN     hw/i386/xen/trace.h
  GEN     hw/9pfs/trace.h
  GEN     hw/ppc/trace.h
  GEN     hw/pci/trace.h
  GEN     hw/s390x/trace.h
  GEN     hw/vfio/trace.h
  GEN     hw/acpi/trace.h
  GEN     hw/arm/trace.h
  GEN     hw/alpha/trace.h
  GEN     hw/xen/trace.h
  GEN     ui/trace.h
  GEN     audio/trace.h
  GEN     net/trace.h
  GEN     target/arm/trace.h
  GEN     target/i386/trace.h
  GEN     target/mips/trace.h
  GEN     target/sparc/trace.h
  GEN     target/s390x/trace.h
  GEN     target/ppc/trace.h
  GEN     qom/trace.h
  GEN     linux-user/trace.h
  GEN     qapi/trace.h
  GEN     accel/tcg/trace.h
  GEN     accel/kvm/trace.h
  GEN     nbd/trace.h
  GEN     trace-root.c
  GEN     util/trace.c
  GEN     crypto/trace.c
  GEN     io/trace.c
  GEN     migration/trace.c
  GEN     block/trace.c
  GEN     chardev/trace.c
  GEN     hw/block/trace.c
  GEN     hw/block/dataplane/trace.c
  GEN     hw/char/trace.c
  GEN     hw/intc/trace.c
  GEN     hw/net/trace.c
  GEN     hw/virtio/trace.c
  GEN     hw/audio/trace.c
  GEN     hw/misc/trace.c
  GEN     hw/scsi/trace.c
  GEN     hw/usb/trace.c
  GEN     hw/nvram/trace.c
  GEN     hw/display/trace.c
  GEN     hw/input/trace.c
  GEN     hw/timer/trace.c
  GEN     hw/dma/trace.c
  GEN     hw/sd/trace.c
  GEN     hw/isa/trace.c
  GEN     hw/sparc/trace.c
  GEN     hw/i386/trace.c
  GEN     hw/mem/trace.c
  GEN     hw/i386/xen/trace.c
  GEN     hw/9pfs/trace.c
  GEN     hw/ppc/trace.c
  GEN     hw/pci/trace.c
  GEN     hw/s390x/trace.c
  GEN     hw/vfio/trace.c
  GEN     hw/acpi/trace.c
  GEN     hw/alpha/trace.c
  GEN     hw/arm/trace.c
  GEN     hw/xen/trace.c
  GEN     ui/trace.c
  GEN     audio/trace.c
  GEN     net/trace.c
  GEN     target/arm/trace.c
  GEN     target/i386/trace.c
  GEN     target/mips/trace.c
  GEN     target/sparc/trace.c
  GEN     target/ppc/trace.c
  GEN     target/s390x/trace.c
  GEN     qom/trace.c
  GEN     linux-user/trace.c
  GEN     qapi/trace.c
  GEN     accel/tcg/trace.c
  GEN     accel/kvm/trace.c
  GEN     nbd/trace.c
  GEN     config-all-devices.mak
  CC      tests/qemu-iotests/socket_scm_helper.o
  GEN     qemu-options.texi
  GEN     docs/version.texi
  GEN     qemu-monitor.texi
  GEN     qemu-img-cmds.texi
  GEN     qemu-monitor-info.texi
  GEN     qemu-img.1
  GEN     qemu-nbd.8
  GEN     qemu-ga.8
  GEN     docs/interop/qemu-qmp-qapi.texi
  GEN     docs/interop/qemu-ga-qapi.texi
  GEN     qga/qapi-generated/qga-qapi-types.h
  GEN     fsdev/virtfs-proxy-helper.1
  GEN     qga/qapi-generated/qga-qapi-visit.h
  GEN     qga/qapi-generated/qga-qmp-commands.h
  GEN     qga/qapi-generated/qga-qapi-types.c
  GEN     qga/qapi-generated/qga-qapi-visit.c
  GEN     qga/qapi-generated/qga-qmp-marshal.c
  CC      qapi-types.o
  CC      qmp-introspect.o
  CC      qapi-visit.o
  CC      qapi-event.o
  CC      qapi/qapi-visit-core.o
  CC      qapi/qapi-dealloc-visitor.o
  CC      qapi/qobject-input-visitor.o
  CC      qapi/qobject-output-visitor.o
  CC      qapi/qmp-registry.o
  CC      qapi/qmp-dispatch.o
  CC      qapi/string-input-visitor.o
  CC      qapi/opts-visitor.o
  CC      qapi/string-output-visitor.o
  CC      qapi/qapi-clone-visitor.o
  CC      qapi/qmp-event.o
  CC      qapi/qapi-util.o
  CC      qobject/qnull.o
  CC      qobject/qnum.o
  CC      qobject/qstring.o
  CC      qobject/qdict.o
  CC      qobject/qlist.o
  CC      qobject/qbool.o
  CC      qobject/qlit.o
  CC      qobject/qjson.o
  CC      qobject/qobject.o
  CC      qobject/json-lexer.o
  CC      qobject/json-streamer.o
  CC      qobject/json-parser.o
  CC      trace/control.o
  CC      trace/qmp.o
  CC      util/osdep.o
  CC      util/cutils.o
  CC      util/unicode.o
  CC      util/qemu-timer-common.o
  CC      util/bufferiszero.o
  CC      util/aiocb.o
  CC      util/lockcnt.o
  CC      util/async.o
  CC      util/thread-pool.o
  CC      util/main-loop.o
  CC      util/qemu-timer.o
  CC      util/iohandler.o
  CC      util/aio-posix.o
  CC      util/compatfd.o
  CC      util/mmap-alloc.o
  CC      util/event_notifier-posix.o
  CC      util/oslib-posix.o
  CC      util/qemu-openpty.o
  CC      util/qemu-thread-posix.o
  CC      util/envlist.o
  CC      util/memfd.o
  CC      util/path.o
  CC      util/host-utils.o
  CC      util/module.o
  CC      util/bitops.o
  CC      util/bitmap.o
  CC      util/hbitmap.o
  CC      util/fifo8.o
  CC      util/acl.o
  CC      util/cacheinfo.o
  CC      util/error.o
  CC      util/qemu-error.o
  CC      util/id.o
  CC      util/iov.o
  CC      util/qemu-config.o
  CC      util/qemu-sockets.o
  CC      util/uri.o
  CC      util/notify.o
  CC      util/qemu-option.o
  CC      util/qemu-progress.o
  CC      util/keyval.o
  CC      util/hexdump.o
  CC      util/crc32c.o
  CC      util/uuid.o
  CC      util/throttle.o
  CC      util/readline.o
  CC      util/getauxval.o
  CC      util/rcu.o
  CC      util/qemu-coroutine.o
  CC      util/qemu-coroutine-lock.o
  CC      util/qemu-coroutine-sleep.o
  CC      util/qemu-coroutine-io.o
  CC      util/coroutine-ucontext.o
  CC      util/buffer.o
  CC      util/timed-average.o
  CC      util/base64.o
  CC      util/log.o
  CC      util/qdist.o
  CC      util/qht.o
  CC      util/range.o
  CC      util/stats64.o
  CC      util/systemd.o
  CC      trace-root.o
  CC      util/trace.o
  CC      crypto/trace.o
  CC      io/trace.o
  CC      migration/trace.o
  CC      block/trace.o
  CC      chardev/trace.o
  CC      hw/block/trace.o
  CC      hw/block/dataplane/trace.o
  CC      hw/char/trace.o
  CC      hw/intc/trace.o
  CC      hw/net/trace.o
  CC      hw/virtio/trace.o
  CC      hw/audio/trace.o
  CC      hw/misc/trace.o
  CC      hw/usb/trace.o
  CC      hw/scsi/trace.o
  CC      hw/nvram/trace.o
  CC      hw/display/trace.o
  CC      hw/input/trace.o
  CC      hw/timer/trace.o
  CC      hw/dma/trace.o
  CC      hw/sparc/trace.o
  CC      hw/sd/trace.o
  CC      hw/isa/trace.o
  CC      hw/mem/trace.o
  CC      hw/i386/trace.o
  CC      hw/i386/xen/trace.o
  CC      hw/9pfs/trace.o
  CC      hw/ppc/trace.o
  CC      hw/pci/trace.o
  CC      hw/s390x/trace.o
  CC      hw/vfio/trace.o
  CC      hw/acpi/trace.o
  CC      hw/arm/trace.o
  CC      hw/alpha/trace.o
  CC      hw/xen/trace.o
  CC      ui/trace.o
  CC      audio/trace.o
  CC      target/arm/trace.o
  CC      net/trace.o
  CC      target/i386/trace.o
  CC      target/sparc/trace.o
  CC      target/mips/trace.o
  CC      target/s390x/trace.o
  CC      target/ppc/trace.o
  CC      qom/trace.o
  CC      qapi/trace.o
  CC      linux-user/trace.o
  CC      accel/tcg/trace.o
  CC      accel/kvm/trace.o
  CC      nbd/trace.o
  CC      crypto/pbkdf-stub.o
  CC      stubs/arch-query-cpu-def.o
  CC      stubs/arch-query-cpu-model-expansion.o
  CC      stubs/arch-query-cpu-model-comparison.o
  CC      stubs/arch-query-cpu-model-baseline.o
  CC      stubs/bdrv-next-monitor-owned.o
  CC      stubs/blk-commit-all.o
  CC      stubs/blockdev-close-all-bdrv-states.o
  CC      stubs/clock-warp.o
  CC      stubs/cpu-get-icount.o
  CC      stubs/cpu-get-clock.o
  CC      stubs/dump.o
  CC      stubs/error-printf.o
  CC      stubs/fdset.o
  CC      stubs/gdbstub.o
  CC      stubs/get-vm-name.o
  CC      stubs/iothread.o
  CC      stubs/iothread-lock.o
  CC      stubs/is-daemonized.o
  CC      stubs/linux-aio.o
  CC      stubs/migr-blocker.o
  CC      stubs/machine-init-done.o
  CC      stubs/change-state-handler.o
  CC      stubs/monitor.o
  CC      stubs/notify-event.o
  CC      stubs/qtest.o
  CC      stubs/replay.o
  CC      stubs/set-fd-handler.o
  CC      stubs/runstate-check.o
  CC      stubs/slirp.o
  CC      stubs/sysbus.o
  CC      stubs/trace-control.o
  CC      stubs/uuid.o
  CC      stubs/vm-stop.o
  CC      stubs/vmstate.o
  CC      stubs/qmp_pc_dimm_device_list.o
  CC      stubs/target-monitor-defs.o
  CC      stubs/pc_madt_cpu_entry.o
  CC      stubs/target-get-monitor-def.o
  CC      stubs/vmgenid.o
  CC      stubs/xen-common.o
  CC      stubs/xen-hvm.o
  CC      stubs/pci-host-piix.o
  CC      contrib/ivshmem-client/ivshmem-client.o
  CC      contrib/ivshmem-client/main.o
  CC      contrib/ivshmem-server/ivshmem-server.o
  CC      contrib/ivshmem-server/main.o
  CC      qemu-nbd.o
  CC      block.o
  CC      blockjob.o
  CC      qemu-io-cmds.o
  CC      replication.o
  CC      block/raw-format.o
  CC      block/qcow.o
  CC      block/vdi.o
  CC      block/vmdk.o
  CC      block/cloop.o
  CC      block/bochs.o
  CC      block/vpc.o
  CC      block/vvfat.o
  CC      block/dmg.o
  CC      block/qcow2.o
  CC      block/qcow2-refcount.o
  CC      block/qcow2-cluster.o
  CC      block/qcow2-snapshot.o
  CC      block/qcow2-cache.o
  CC      block/qcow2-bitmap.o
  CC      block/qed.o
  CC      block/qed-l2-cache.o
  CC      block/qed-table.o
  CC      block/qed-cluster.o
  CC      block/qed-check.o
  CC      block/vhdx.o
  CC      block/vhdx-endian.o
  CC      block/vhdx-log.o
  CC      block/quorum.o
  CC      block/parallels.o
  CC      block/blkdebug.o
  CC      block/blkverify.o
  CC      block/blkreplay.o
  CC      block/block-backend.o
  CC      block/snapshot.o
  CC      block/qapi.o
  CC      block/file-posix.o
  CC      block/linux-aio.o
  CC      block/null.o
  CC      block/mirror.o
  CC      block/commit.o
  CC      block/io.o
  CC      block/throttle-groups.o
  CC      block/nbd.o
  CC      block/nbd-client.o
  CC      block/sheepdog.o
  CC      block/iscsi-opts.o
  CC      block/accounting.o
  CC      block/dirty-bitmap.o
  CC      block/write-threshold.o
  CC      block/backup.o
  CC      block/replication.o
  CC      block/throttle.o
  CC      block/crypto.o
  CC      nbd/server.o
  CC      nbd/client.o
  CC      nbd/common.o
  CC      block/iscsi.o
  CC      block/nfs.o
  CC      block/curl.o
  CC      block/rbd.o
  CC      block/gluster.o
  CC      block/ssh.o
/var/tmp/patchew-tester-tmp-ihkih90_/src/block/rbd.c: In function ‘qemu_rbd_update_bh’:
/var/tmp/patchew-tester-tmp-ihkih90_/src/block/rbd.c:558:56: error: ‘BDRVRBDState {aka struct BDRVRBDState}’ has no member named ‘name’
         error_report("error reading size for %s: %s", s->name, strerror(-r));
                                                        ^~
In file included from /var/tmp/patchew-tester-tmp-ihkih90_/src/block/rbd.c:17:0:
/var/tmp/patchew-tester-tmp-ihkih90_/src/block/rbd.c: In function ‘qemu_rbd_open’:
/var/tmp/patchew-tester-tmp-ihkih90_/src/block/rbd.c:740:72: error: ‘BDRVRBDState {aka struct BDRVRBDState}’ has no member named ‘name’
         error_setg_errno(errp, -r, "error registering watcher on %s", s->name);
                                                                        ^
/var/tmp/patchew-tester-tmp-ihkih90_/src/include/qapi/error.h:178:53: note: in definition of macro ‘error_setg_errno’
                               (os_error), (fmt), ## __VA_ARGS__)
                                                     ^~~~~~~~~~~
/var/tmp/patchew-tester-tmp-ihkih90_/src/block/rbd.c:746:66: error: ‘BDRVRBDState {aka struct BDRVRBDState}’ has no member named ‘name’
         error_setg_errno(errp, -r, "error reading size for %s", s->name);
                                                                  ^
/var/tmp/patchew-tester-tmp-ihkih90_/src/include/qapi/error.h:178:53: note: in definition of macro ‘error_setg_errno’
                               (os_error), (fmt), ## __VA_ARGS__)
                                                     ^~~~~~~~~~~
/var/tmp/patchew-tester-tmp-ihkih90_/src/rules.mak:66: recipe for target 'block/rbd.o' failed
make: *** [block/rbd.o] Error 1
make: *** Waiting for unfinished jobs....
=== OUTPUT END ===

Test command exited with code: 2


---
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Please send your feedback to patchew-devel@freelists.org
John Snow Sept. 13, 2017, 8:53 p.m. | #3
On 09/13/2017 12:44 PM, Adam Wolfe Gordon wrote:
> Register a watcher with rbd so that we get notified when an image is
> resized. Propagate resizes to parent block devices so that guest devices
> get resized without user intervention.
> 
> Signed-off-by: Adam Wolfe Gordon <awg@digitalocean.com>
> ---
> Hello!
> 
> We are using this patch in production at DigitalOcean and have tested it fairly
> extensively. However, we use the same block device configuration everywhere, so
> I'd be interested to get an answer to the question I've left in the code:>
>> /* NOTE: This assumes there's only one layer between us and the
>>    block-backend. Is this always true? */
> 

Even if it were always true presently, the fact that the block layer
storage graph can be configured in arbitrary ways suggests that it might
not always be true in the future.

Probably in practice MOST drives are configured like
[BB]<--[Format]<--[Protocol], but the block layer is adding a lot of fun
stuff like filter nodes for throttling or debugging, so it's probably
too much to assert that the length of the chain will ALWAYS be exactly two.

Can I play dumb and ask what you are trying to accomplish? The concept
of a drive deciding to resize itself is not something I have a model for
understanding, presently...

> If that isn't true, this patch will need a bit of work to traverse up the block
> device tree and find the block-backend.
> 
> Of course, any other feedback would be welcome too - this is my first foray into
> the qemu code.
> 
> Regards,
> Adam
> 
>  block/rbd.c | 80 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 80 insertions(+)
> 
> diff --git a/block/rbd.c b/block/rbd.c
> index 144f350e1f..1c9fcbec1f 100644
> --- a/block/rbd.c
> +++ b/block/rbd.c
> @@ -96,6 +96,8 @@ typedef struct BDRVRBDState {
>      rbd_image_t image;
>      char *image_name;
>      char *snap;
> +    uint64_t watcher_handle;
> +    uint64_t size_bytes;
>  } BDRVRBDState;
>  
>  static char *qemu_rbd_next_tok(char *src, char delim, char **p)
> @@ -540,6 +542,67 @@ out:
>      return rados_str;
>  }
>  
> +/* BH for when rbd notifies us of an update. */
> +static void qemu_rbd_update_bh(void *arg)
> +{
> +    BlockDriverState *parent, *bs = arg;
> +    BDRVRBDState *s = bs->opaque;
> +    bool was_variable_length;
> +    uint64_t new_size_bytes;
> +    int64_t new_parent_len;
> +    BdrvChild *c;
> +    int r;
> +
> +    r = rbd_get_size(s->image, &new_size_bytes);
> +    if (r < 0) {
> +        error_report("error reading size for %s: %s", s->name, strerror(-r));
> +        return;
> +    }
> +
> +    /* Avoid no-op resizes on non-resize notifications. */
> +    if (new_size_bytes == s->size_bytes) {
> +        error_printf("skipping non-resize rbd cb\n");
> +        return;
> +    }
> +
> +    /* NOTE: This assumes there's only one layer between us and the
> +       block-backend. Is this always true? */
> +    parent = bs->inherits_from;
> +    if (parent == NULL) {
> +        error_report("bs %s does not have parent", bdrv_get_device_or_node_name(bs));
> +        return;
> +    }
> +
> +    /* Force parents to re-read our size. */
> +    was_variable_length = bs->drv->has_variable_length;
> +    bs->drv->has_variable_length = true;
> +    new_parent_len = bdrv_getlength(parent);
> +    if (new_parent_len < 0) {
> +        error_report("getlength failed on parent %s", bdrv_get_device_or_node_name(parent));
> +        bs->drv->has_variable_length = was_variable_length;
> +        return;
> +    }
> +    bs->drv->has_variable_length = was_variable_length;
> +
> +    /* Notify block backends that that we have resized.
> +       Copied from bdrv_parent_cb_resize. */
> +    QLIST_FOREACH(c, &parent->parents, next_parent) {
> +        if (c->role->resize) {
> +            c->role->resize(c);
> +        }
> +    }
> +
> +    s->size_bytes = new_size_bytes;
> +}
> +
> +/* Called from non-qemu thread - careful! */
> +static void qemu_rbd_update_cb(void *arg)
> +{
> +    BlockDriverState *bs = arg;
> +
> +    aio_bh_schedule_oneshot(bdrv_get_aio_context(bs), qemu_rbd_update_bh, bs);
> +}
> +
>  static int qemu_rbd_open(BlockDriverState *bs, QDict *options, int flags,
>                           Error **errp)
>  {
> @@ -672,9 +735,25 @@ static int qemu_rbd_open(BlockDriverState *bs, QDict *options, int flags,
>          }
>      }
>  
> +    r = rbd_update_watch(s->image, &s->watcher_handle, qemu_rbd_update_cb, bs);
> +    if (r < 0) {
> +        error_setg_errno(errp, -r, "error registering watcher on %s", s->name);
> +        goto failed_watch;
> +    }
> +
> +    r = rbd_get_size(s->image, &s->size_bytes);
> +    if (r < 0) {
> +        error_setg_errno(errp, -r, "error reading size for %s", s->name);
> +        goto failed_sz;
> +    }
> +
>      qemu_opts_del(opts);
>      return 0;
>  
> +failed_sz:
> +    rbd_update_unwatch(s->image, s->watcher_handle);
> +failed_watch:
> +    rbd_close(s->image);
>  failed_open:
>      rados_ioctx_destroy(s->io_ctx);
>  failed_shutdown:
> @@ -712,6 +791,7 @@ static void qemu_rbd_close(BlockDriverState *bs)
>  {
>      BDRVRBDState *s = bs->opaque;
>  
> +    rbd_update_unwatch(s->image, s->watcher_handle);
>      rbd_close(s->image);
>      rados_ioctx_destroy(s->io_ctx);
>      g_free(s->snap);
>
Jason Dillaman Sept. 13, 2017, 9:21 p.m. | #4
On Wed, 2017-09-13 at 10:44 -0600, Adam Wolfe Gordon wrote:
> Register a watcher with rbd so that we get notified when an image is
> resized. Propagate resizes to parent block devices so that guest devices
> get resized without user intervention.
> 
> Signed-off-by: Adam Wolfe Gordon <awg@digitalocean.com>
> ---
> Hello!
> 
> We are using this patch in production at DigitalOcean and have tested it fairly
> extensively. However, we use the same block device configuration everywhere, so
> I'd be interested to get an answer to the question I've left in the code:
> 
> > /* NOTE: This assumes there's only one layer between us and the
> >    block-backend. Is this always true? */
> 
> If that isn't true, this patch will need a bit of work to traverse up the block
> device tree and find the block-backend.
> 
> Of course, any other feedback would be welcome too - this is my first foray into
> the qemu code.
> 
> Regards,
> Adam
> 
>  block/rbd.c | 80 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 80 insertions(+)
> 
> diff --git a/block/rbd.c b/block/rbd.c
> index 144f350e1f..1c9fcbec1f 100644
> --- a/block/rbd.c
> +++ b/block/rbd.c
> @@ -96,6 +96,8 @@ typedef struct BDRVRBDState {
>      rbd_image_t image;
>      char *image_name;
>      char *snap;
> +    uint64_t watcher_handle;
> +    uint64_t size_bytes;
>  } BDRVRBDState;
>  
>  static char *qemu_rbd_next_tok(char *src, char delim, char **p)
> @@ -540,6 +542,67 @@ out:
>      return rados_str;
>  }
>  
> +/* BH for when rbd notifies us of an update. */
> +static void qemu_rbd_update_bh(void *arg)
> +{
> +    BlockDriverState *parent, *bs = arg;
> +    BDRVRBDState *s = bs->opaque;
> +    bool was_variable_length;
> +    uint64_t new_size_bytes;
> +    int64_t new_parent_len;
> +    BdrvChild *c;
> +    int r;
> +
> +    r = rbd_get_size(s->image, &new_size_bytes);
> +    if (r < 0) {
> +        error_report("error reading size for %s: %s", s->name, strerror(-r));
> +        return;
> +    }
> +
> +    /* Avoid no-op resizes on non-resize notifications. */
> +    if (new_size_bytes == s->size_bytes) {
> +        error_printf("skipping non-resize rbd cb\n");

Image update callbacks can be invoked for any number of reasons, not
just resize events. Therefore, you probably don't want to have an error
message printed out here.

> +        return;
> +    }
> +
> +    /* NOTE: This assumes there's only one layer between us and the
> +       block-backend. Is this always true? */

I don't think that can be assumed to be true.

> +    parent = bs->inherits_from;
> +    if (parent == NULL) {
> +        error_report("bs %s does not have parent", bdrv_get_device_or_node_name(bs));
> +        return;
> +    }
> +
> +    /* Force parents to re-read our size. */

Can you just invoke blk_truncate instead? 

> +    was_variable_length = bs->drv->has_variable_length;
> +    bs->drv->has_variable_length = true;
> +    new_parent_len = bdrv_getlength(parent);
> +    if (new_parent_len < 0) {
> +        error_report("getlength failed on parent %s", bdrv_get_device_or_node_name(parent));
> +        bs->drv->has_variable_length = was_variable_length;
> +        return;
> +    }
> +    bs->drv->has_variable_length = was_variable_length;
> +
> +    /* Notify block backends that that we have resized.
> +       Copied from bdrv_parent_cb_resize. */
> +    QLIST_FOREACH(c, &parent->parents, next_parent) {
> +        if (c->role->resize) {
> +            c->role->resize(c);
> +        }
> +    }
> +
> +    s->size_bytes = new_size_bytes;
> +}
> +
> +/* Called from non-qemu thread - careful! */
> +static void qemu_rbd_update_cb(void *arg)
> +{
> +    BlockDriverState *bs = arg;
> +
> +    aio_bh_schedule_oneshot(bdrv_get_aio_context(bs), qemu_rbd_update_bh, bs);
> +}
> +
>  static int qemu_rbd_open(BlockDriverState *bs, QDict *options, int flags,
>                           Error **errp)
>  {
> @@ -672,9 +735,25 @@ static int qemu_rbd_open(BlockDriverState *bs, QDict *options, int flags,
>          }
>      }
>  
> +    r = rbd_update_watch(s->image, &s->watcher_handle, qemu_rbd_update_cb, bs);

This API method was only added in the Ceph Jewel release just over a
year ago. This should probably gracefully degrade if compiled against an
older version of the librbd API.

> +    if (r < 0) {
> +        error_setg_errno(errp, -r, "error registering watcher on %s", s->name);
> +        goto failed_watch;
> +    }
> +
> +    r = rbd_get_size(s->image, &s->size_bytes);
> +    if (r < 0) {
> +        error_setg_errno(errp, -r, "error reading size for %s", s->name);
> +        goto failed_sz;
> +    }
> +
>      qemu_opts_del(opts);
>      return 0;
>  
> +failed_sz:
> +    rbd_update_unwatch(s->image, s->watcher_handle);
> +failed_watch:
> +    rbd_close(s->image);
>  failed_open:
>      rados_ioctx_destroy(s->io_ctx);
>  failed_shutdown:
> @@ -712,6 +791,7 @@ static void qemu_rbd_close(BlockDriverState *bs)
>  {
>      BDRVRBDState *s = bs->opaque;
>  
> +    rbd_update_unwatch(s->image, s->watcher_handle);
>      rbd_close(s->image);
>      rados_ioctx_destroy(s->io_ctx);
>      g_free(s->snap);
Adam Wolfe Gordon via Qemu-devel Sept. 13, 2017, 9:36 p.m. | #5
On Wed, Sep 13, 2017 at 2:53 PM, John Snow <jsnow@redhat.com> wrote:
> On 09/13/2017 12:44 PM, Adam Wolfe Gordon wrote:
>> Register a watcher with rbd so that we get notified when an image is
>> resized. Propagate resizes to parent block devices so that guest devices
>> get resized without user intervention.
>>
>> Signed-off-by: Adam Wolfe Gordon <awg@digitalocean.com>
>> ---
>> Hello!
>>
>> We are using this patch in production at DigitalOcean and have tested it fairly
>> extensively. However, we use the same block device configuration everywhere, so
>> I'd be interested to get an answer to the question I've left in the code:>
>>> /* NOTE: This assumes there's only one layer between us and the
>>>    block-backend. Is this always true? */
>>
>
> Even if it were always true presently, the fact that the block layer
> storage graph can be configured in arbitrary ways suggests that it might
> not always be true in the future.
>
> Probably in practice MOST drives are configured like
> [BB]<--[Format]<--[Protocol], but the block layer is adding a lot of fun
> stuff like filter nodes for throttling or debugging, so it's probably
> too much to assert that the length of the chain will ALWAYS be exactly two.

OK, thanks - that's exactly what I was wondering. I can add some code
to traverse the parents until we get to the BB.

> Can I play dumb and ask what you are trying to accomplish? The concept
> of a drive deciding to resize itself is not something I have a model for
> understanding, presently...

Good question; I probably should have explained the use-case in the
commit message.

We have a storage orchestration service that manages our ceph block
storage clusters and doesn't interact directly with qemu. Volumes get
resized through the orchestration service, which (after doing some
checks, updating external metadata, etc.) issues the resize via
librbd. The drive doesn't exactly resize itself, but the trigger is
out-of-band from any VM the drive may be attached to.

Previously, we would notify the VM of the resize by issuing a
blockresize via qmp after doing the resize itself externally. That
meant we were actually resizing the rbd image twice (though the second
was, hopefully, a no-op). We occasionally had trouble with the resize
issued by qemu getting stuck and blocking the qemu main thread.
Detecting the out-of-band resize lets us avoid the extra rbd_resize
call and means that we never modify an rbd image's metadata from qemu.
Adam Wolfe Gordon via Qemu-devel Sept. 13, 2017, 9:56 p.m. | #6
On Wed, Sep 13, 2017 at 3:21 PM, Jason Dillaman <jdillama@redhat.com> wrote:
> On Wed, 2017-09-13 at 10:44 -0600, Adam Wolfe Gordon wrote:
>> +    parent = bs->inherits_from;
>> +    if (parent == NULL) {
>> +        error_report("bs %s does not have parent", bdrv_get_device_or_node_name(bs));
>> +        return;
>> +    }
>> +
>> +    /* Force parents to re-read our size. */
>
> Can you just invoke blk_truncate instead?

blk_truncate will end up calling qemu_rbd_truncate, which does an
rbd_resize. The goal of this patch is to avoid calling rbd_resize from
qemu, since we do resizes from an external orchestration service.

That said, this patch also introduces a cache of the size (in
BDRVRBDState.size_bytes), so it would be possible for
qemu_rbd_truncate to avoid calling rbd_resize when the image is
already the right size. If I did that, we could use blk_truncate when
we detect a resize as well. Would that be a desirable change?
John Snow Sept. 14, 2017, 12:47 a.m. | #7
On 09/13/2017 05:36 PM, Adam Wolfe Gordon via Qemu-devel wrote:
> On Wed, Sep 13, 2017 at 2:53 PM, John Snow <jsnow@redhat.com> wrote:
>> On 09/13/2017 12:44 PM, Adam Wolfe Gordon wrote:
>>> Register a watcher with rbd so that we get notified when an image is
>>> resized. Propagate resizes to parent block devices so that guest devices
>>> get resized without user intervention.
>>>
>>> Signed-off-by: Adam Wolfe Gordon <awg@digitalocean.com>
>>> ---
>>> Hello!
>>>
>>> We are using this patch in production at DigitalOcean and have tested it fairly
>>> extensively. However, we use the same block device configuration everywhere, so
>>> I'd be interested to get an answer to the question I've left in the code:>
>>>> /* NOTE: This assumes there's only one layer between us and the
>>>>    block-backend. Is this always true? */
>>>
>>
>> Even if it were always true presently, the fact that the block layer
>> storage graph can be configured in arbitrary ways suggests that it might
>> not always be true in the future.
>>
>> Probably in practice MOST drives are configured like
>> [BB]<--[Format]<--[Protocol], but the block layer is adding a lot of fun
>> stuff like filter nodes for throttling or debugging, so it's probably
>> too much to assert that the length of the chain will ALWAYS be exactly two.
> 
> OK, thanks - that's exactly what I was wondering. I can add some code
> to traverse the parents until we get to the BB.
> 
>> Can I play dumb and ask what you are trying to accomplish? The concept
>> of a drive deciding to resize itself is not something I have a model for
>> understanding, presently...
> 
> Good question; I probably should have explained the use-case in the
> commit message.
> 
> We have a storage orchestration service that manages our ceph block
> storage clusters and doesn't interact directly with qemu. Volumes get
> resized through the orchestration service, which (after doing some

resized bigger, one hopes ...

> checks, updating external metadata, etc.) issues the resize via
> librbd. The drive doesn't exactly resize itself, but the trigger is
> out-of-band from any VM the drive may be attached to.

From QEMU's POV, the drive resized itself! Facts on the ground may be
different, of course.

> 
> Previously, we would notify the VM of the resize by issuing a
> blockresize via qmp after doing the resize itself externally. That
> meant we were actually resizing the rbd image twice (though the second
> was, hopefully, a no-op). We occasionally had trouble with the resize
> issued by qemu getting stuck and blocking the qemu main thread.
> Detecting the out-of-band resize lets us avoid the extra rbd_resize
> call and means that we never modify an rbd image's metadata from qemu.
> 

Hm, I see... It sounds like you want an operation here that lets us
detect medium changes without actually attempting to orchestrate one.

It smells like you want the second half of bdrv_truncate without
actually issuing the call. Perhaps you could split this function into
its two halves, and in the event of an external resize being detected,
you could call the latter-half portion of bdrv_truncate.

...if the drive is configured to automatically detect those events, that
is. Conceivably not all resize events that QEMU *could* detect *should*
automatically result in guest-visible changes as soon as they occur.

--js
Adam Wolfe Gordon via Qemu-devel Sept. 14, 2017, 10:27 p.m. | #8
On Wed, Sep 13, 2017 at 6:47 PM, John Snow <jsnow@redhat.com> wrote:
> On 09/13/2017 05:36 PM, Adam Wolfe Gordon via Qemu-devel wrote:
>> On Wed, Sep 13, 2017 at 2:53 PM, John Snow <jsnow@redhat.com> wrote:
>> We have a storage orchestration service that manages our ceph block
>> storage clusters and doesn't interact directly with qemu. Volumes get
>> resized through the orchestration service, which (after doing some
>
> resized bigger, one hopes ...

Indeed! That's actually one of the reasons for this change: it's much
easier to guarantee that we're always resizing bigger if all resizes
are issued in the same place.

>> Previously, we would notify the VM of the resize by issuing a
>> blockresize via qmp after doing the resize itself externally. That
>> meant we were actually resizing the rbd image twice (though the second
>> was, hopefully, a no-op). We occasionally had trouble with the resize
>> issued by qemu getting stuck and blocking the qemu main thread.
>> Detecting the out-of-band resize lets us avoid the extra rbd_resize
>> call and means that we never modify an rbd image's metadata from qemu.
>>
>
> Hm, I see... It sounds like you want an operation here that lets us
> detect medium changes without actually attempting to orchestrate one.
>
> It smells like you want the second half of bdrv_truncate without
> actually issuing the call. Perhaps you could split this function into
> its two halves, and in the event of an external resize being detected,
> you could call the latter-half portion of bdrv_truncate.

Yes, I think that agrees with what Jason Dillaman suggested yesterday,
and makes sense to me. Will do that for a v2 of this patch.

> ...if the drive is configured to automatically detect those events, that
> is. Conceivably not all resize events that QEMU *could* detect *should*
> automatically result in guest-visible changes as soon as they occur.

Good point. I can add an option for this to the rbd driver. My gut
feeling is that the default should be off (i.e., the existing
behavior) to avoid any surprises for users who upgrade.

Thanks for the review. I'll get a v2 out as time allows.

-- awg
Kevin Wolf Sept. 15, 2017, 12:33 p.m. | #9
Am 13.09.2017 um 18:44 hat Adam Wolfe Gordon geschrieben:
> Register a watcher with rbd so that we get notified when an image is
> resized. Propagate resizes to parent block devices so that guest devices
> get resized without user intervention.
> 
> Signed-off-by: Adam Wolfe Gordon <awg@digitalocean.com>
> ---
> Hello!
> 
> We are using this patch in production at DigitalOcean and have tested it fairly
> extensively. However, we use the same block device configuration everywhere, so
> I'd be interested to get an answer to the question I've left in the code:
> 
> > /* NOTE: This assumes there's only one layer between us and the
> >    block-backend. Is this always true? */
> 
> If that isn't true, this patch will need a bit of work to traverse up the block
> device tree and find the block-backend.
> 
> Of course, any other feedback would be welcome too - this is my first foray into
> the qemu code.
> 
> Regards,
> Adam
> 
>  block/rbd.c | 80 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
>  1 file changed, 80 insertions(+)
> 
> diff --git a/block/rbd.c b/block/rbd.c
> index 144f350e1f..1c9fcbec1f 100644
> --- a/block/rbd.c
> +++ b/block/rbd.c
> @@ -96,6 +96,8 @@ typedef struct BDRVRBDState {
>      rbd_image_t image;
>      char *image_name;
>      char *snap;
> +    uint64_t watcher_handle;
> +    uint64_t size_bytes;
>  } BDRVRBDState;
>  
>  static char *qemu_rbd_next_tok(char *src, char delim, char **p)
> @@ -540,6 +542,67 @@ out:
>      return rados_str;
>  }
>  
> +/* BH for when rbd notifies us of an update. */
> +static void qemu_rbd_update_bh(void *arg)
> +{
> +    BlockDriverState *parent, *bs = arg;
> +    BDRVRBDState *s = bs->opaque;
> +    bool was_variable_length;
> +    uint64_t new_size_bytes;
> +    int64_t new_parent_len;
> +    BdrvChild *c;
> +    int r;
> +
> +    r = rbd_get_size(s->image, &new_size_bytes);
> +    if (r < 0) {
> +        error_report("error reading size for %s: %s", s->name, strerror(-r));
> +        return;
> +    }
> +
> +    /* Avoid no-op resizes on non-resize notifications. */
> +    if (new_size_bytes == s->size_bytes) {
> +        error_printf("skipping non-resize rbd cb\n");
> +        return;
> +    }
> +
> +    /* NOTE: This assumes there's only one layer between us and the
> +       block-backend. Is this always true? */
> +    parent = bs->inherits_from;

There's more wrong about this than just making assumptions about the
graph layout above our own node (which would be wrong enough already).

Other assumptions that you are making here and that don't hold true
generally are that there is only one parent node (no reason why the
image couldn't be used by two different users) and that we always
inherit from a parent. If this node was created explicitly by the user
with its own -blockdev (or -drive) option, it doesn't inherit options
from any of its parents.

Basically, a block driver shouldn't care about its users and it can't
access them in a clean way. This is intentional.

> +    if (parent == NULL) {
> +        error_report("bs %s does not have parent", bdrv_get_device_or_node_name(bs));
> +        return;
> +    }
> +
> +    /* Force parents to re-read our size. */
> +    was_variable_length = bs->drv->has_variable_length;
> +    bs->drv->has_variable_length = true;
> +    new_parent_len = bdrv_getlength(parent);
> +    if (new_parent_len < 0) {
> +        error_report("getlength failed on parent %s", bdrv_get_device_or_node_name(parent));
> +        bs->drv->has_variable_length = was_variable_length;
> +        return;
> +    }
> +    bs->drv->has_variable_length = was_variable_length;
> +
> +    /* Notify block backends that that we have resized.
> +       Copied from bdrv_parent_cb_resize. */
> +    QLIST_FOREACH(c, &parent->parents, next_parent) {
> +        if (c->role->resize) {
> +            c->role->resize(c);
> +        }
> +    }

This is the right approach that you should use consistently instead.

You don't only notify BlockBackends here (you do so if there is no layer
between rbd and the BlockBackend, i.e. rbd is the root node), but you
also notify any parent nodes (BlockDriverStates), which can react to
this.

child_file/child_format don't currently handle .resize, so if you have
any layers between rbd and the BB, this code doesn't do anything at the
moment.

However, you could introduce an implementation of .resize. An important
point here is that it depends on the specific block driver what to do
with this notification. Maybe we need a new BlockDriver callback. Raw
images will just propagate this and call .resize on all of their
parents. For qcow2 images, the size change of the image file doesn't
make a difference for the virtual disk that the driver exposes, so it
will silently ignore the notification.

Kevin
Eric Blake Sept. 15, 2017, 10:08 p.m. | #10
On 09/15/2017 07:33 AM, Kevin Wolf wrote:
> Am 13.09.2017 um 18:44 hat Adam Wolfe Gordon geschrieben:
>> Register a watcher with rbd so that we get notified when an image is
>> resized. Propagate resizes to parent block devices so that guest devices
>> get resized without user intervention.
>>
>> Signed-off-by: Adam Wolfe Gordon <awg@digitalocean.com>
>> ---

> 
> There's more wrong about this than just making assumptions about the
> graph layout above our own node (which would be wrong enough already).
> 
> Other assumptions that you are making here and that don't hold true
> generally are that there is only one parent node (no reason why the
> image couldn't be used by two different users) and that we always
> inherit from a parent. If this node was created explicitly by the user
> with its own -blockdev (or -drive) option, it doesn't inherit options
> from any of its parents.
> 
> Basically, a block driver shouldn't care about its users and it can't
> access them in a clean way. This is intentional.
> 
>> +    if (parent == NULL) {
>> +        error_report("bs %s does not have parent", bdrv_get_device_or_node_name(bs));
>> +        return;
>> +    }
>> +
>> +    /* Force parents to re-read our size. */
>> +    was_variable_length = bs->drv->has_variable_length;
>> +    bs->drv->has_variable_length = true;
>> +    new_parent_len = bdrv_getlength(parent);
>> +    if (new_parent_len < 0) {
>> +        error_report("getlength failed on parent %s", bdrv_get_device_or_node_name(parent));
>> +        bs->drv->has_variable_length = was_variable_length;
>> +        return;
>> +    }
>> +    bs->drv->has_variable_length = was_variable_length;
>> +
>> +    /* Notify block backends that that we have resized.
>> +       Copied from bdrv_parent_cb_resize. */
>> +    QLIST_FOREACH(c, &parent->parents, next_parent) {
>> +        if (c->role->resize) {
>> +            c->role->resize(c);
>> +        }
>> +    }
> 
> This is the right approach that you should use consistently instead.

Also, we need to fix existing bugs in block.c first; right now,
bdrv_truncate() forgets that refresh_total_sectors() can fail, and then
calls bdrv_dirty_bitmap_truncate() even though that will act on the
wrong length.  If we are going to allow devices to recognize that they
have been externally resized outside of qemu's control, then we need to
make sure that we react to size updates consistently.

I'm trying to fix that [1], but it may interact with what you are trying
to do here.

[1] https://lists.gnu.org/archive/html/qemu-devel/2017-09/msg03776.html

Patch

diff --git a/block/rbd.c b/block/rbd.c
index 144f350e1f..1c9fcbec1f 100644
--- a/block/rbd.c
+++ b/block/rbd.c
@@ -96,6 +96,8 @@  typedef struct BDRVRBDState {
     rbd_image_t image;
     char *image_name;
     char *snap;
+    uint64_t watcher_handle;
+    uint64_t size_bytes;
 } BDRVRBDState;
 
 static char *qemu_rbd_next_tok(char *src, char delim, char **p)
@@ -540,6 +542,67 @@  out:
     return rados_str;
 }
 
+/* BH for when rbd notifies us of an update. */
+static void qemu_rbd_update_bh(void *arg)
+{
+    BlockDriverState *parent, *bs = arg;
+    BDRVRBDState *s = bs->opaque;
+    bool was_variable_length;
+    uint64_t new_size_bytes;
+    int64_t new_parent_len;
+    BdrvChild *c;
+    int r;
+
+    r = rbd_get_size(s->image, &new_size_bytes);
+    if (r < 0) {
+        error_report("error reading size for %s: %s", s->name, strerror(-r));
+        return;
+    }
+
+    /* Avoid no-op resizes on non-resize notifications. */
+    if (new_size_bytes == s->size_bytes) {
+        error_printf("skipping non-resize rbd cb\n");
+        return;
+    }
+
+    /* NOTE: This assumes there's only one layer between us and the
+       block-backend. Is this always true? */
+    parent = bs->inherits_from;
+    if (parent == NULL) {
+        error_report("bs %s does not have parent", bdrv_get_device_or_node_name(bs));
+        return;
+    }
+
+    /* Force parents to re-read our size. */
+    was_variable_length = bs->drv->has_variable_length;
+    bs->drv->has_variable_length = true;
+    new_parent_len = bdrv_getlength(parent);
+    if (new_parent_len < 0) {
+        error_report("getlength failed on parent %s", bdrv_get_device_or_node_name(parent));
+        bs->drv->has_variable_length = was_variable_length;
+        return;
+    }
+    bs->drv->has_variable_length = was_variable_length;
+
+    /* Notify block backends that that we have resized.
+       Copied from bdrv_parent_cb_resize. */
+    QLIST_FOREACH(c, &parent->parents, next_parent) {
+        if (c->role->resize) {
+            c->role->resize(c);
+        }
+    }
+
+    s->size_bytes = new_size_bytes;
+}
+
+/* Called from non-qemu thread - careful! */
+static void qemu_rbd_update_cb(void *arg)
+{
+    BlockDriverState *bs = arg;
+
+    aio_bh_schedule_oneshot(bdrv_get_aio_context(bs), qemu_rbd_update_bh, bs);
+}
+
 static int qemu_rbd_open(BlockDriverState *bs, QDict *options, int flags,
                          Error **errp)
 {
@@ -672,9 +735,25 @@  static int qemu_rbd_open(BlockDriverState *bs, QDict *options, int flags,
         }
     }
 
+    r = rbd_update_watch(s->image, &s->watcher_handle, qemu_rbd_update_cb, bs);
+    if (r < 0) {
+        error_setg_errno(errp, -r, "error registering watcher on %s", s->name);
+        goto failed_watch;
+    }
+
+    r = rbd_get_size(s->image, &s->size_bytes);
+    if (r < 0) {
+        error_setg_errno(errp, -r, "error reading size for %s", s->name);
+        goto failed_sz;
+    }
+
     qemu_opts_del(opts);
     return 0;
 
+failed_sz:
+    rbd_update_unwatch(s->image, s->watcher_handle);
+failed_watch:
+    rbd_close(s->image);
 failed_open:
     rados_ioctx_destroy(s->io_ctx);
 failed_shutdown:
@@ -712,6 +791,7 @@  static void qemu_rbd_close(BlockDriverState *bs)
 {
     BDRVRBDState *s = bs->opaque;
 
+    rbd_update_unwatch(s->image, s->watcher_handle);
     rbd_close(s->image);
     rados_ioctx_destroy(s->io_ctx);
     g_free(s->snap);