On Sat, Nov 30, 2019 at 08:05:40PM +0800, Sun Ke wrote: > Add the test case to check nbd device. This test case catches regressions > fixed by commit 92b5c8f0063e4 "nbd: replace kill_bdev() with > __invalidate_device() again". > > Establish the nbd connection. Run two processes. The first one do mount > and umount, and the other one do clear_sock ioctl. > > Signed-off-by: Sun Ke <sunke32@xxxxxxxxxx> > --- > v2 -> v3 > 1. Now only build nbd0 connection, not 15 connections. > 2. Add the run_cnt to 225. > 3. Modify some variable names. mount_clear_sock still seems overly complicated, so I simplified it. Additionally, we can loop from the C program instead of looping in the shell script and execing a bunch of times. And, it seems like we can use the existing _start_nbd_server/_stop_nbd_server helpers now that we're only using one connection. I made those changes here: https://github.com/osandov/blktests/commit/ab2472ee1c54f7fc69011815e15515846ae40eea Would you mind taking a look and ensuring that it still does what you're trying to do? I seem to have triggered some other sort of deadlock in NBD with the optimized test. > --- > src/Makefile | 3 ++- > src/mount_clear_sock.c | 68 ++++++++++++++++++++++++++++++++++++++++++++++++++ > tests/nbd/003 | 55 ++++++++++++++++++++++++++++++++++++++++ > tests/nbd/003.out | 1 + > 4 files changed, 126 insertions(+), 1 deletion(-) > create mode 100644 src/mount_clear_sock.c > create mode 100644 tests/nbd/003 > create mode 100644 tests/nbd/003.out > > diff --git a/src/Makefile b/src/Makefile > index 917d6f4..acd7327 100644 > --- a/src/Makefile > +++ b/src/Makefile > @@ -10,7 +10,8 @@ C_TARGETS := \ > sg/syzkaller1 \ > nbdsetsize \ > loop_change_fd \ > - zbdioctl > + zbdioctl \ > + mount_clear_sock > > CXX_TARGETS := \ > discontiguous-io > diff --git a/src/mount_clear_sock.c b/src/mount_clear_sock.c > new file mode 100644 > index 0000000..c76cbfe > --- /dev/null > +++ b/src/mount_clear_sock.c > @@ -0,0 +1,68 @@ > +// SPDX-License-Identifier: GPL-3.0+ > +// Copyright (C) 2019 Sun Ke > + > +#include <stdio.h> > +#include <stdlib.h> > + > +#include <sys/types.h> > +#include <sys/stat.h> > +#include <fcntl.h> > + > +#include <linux/nbd.h> > +#include <assert.h> > +#include <sys/wait.h> > +#include <unistd.h> > +#include <string.h> > +#include <sys/ioctl.h> > +#include <sys/mount.h> > +#include <linux/fs.h> > + > +void clear_sock(int fd) > +{ > + int err; > + > + err = ioctl(fd, NBD_CLEAR_SOCK, 0); > + if (err) { > + perror("ioctl"); > + } > +} > + > +void mount_nbd(char *dev, char *mp, char *fs) > +{ > + mount(dev, mp, fs, MS_NOSUID | MS_SYNCHRONOUS, 0); > + umount(mp); > +} > + > +int main(int argc, char **argv) > +{ > + if (argc != 4) { > + fprintf(stderr, "usage: $0 MOUNTPOINT DEV FS"); > + return EXIT_FAILURE; > + } > + > + char *mp = argv[1]; > + char *dev = argv[2]; > + char *fs = argv[3]; > + > + static int fd = -1; > + > + fd = open(dev, O_RDWR); > + if (fd < 0 ) { > + perror("open"); > + } > + > + if (fork() == 0) { > + mount_nbd(dev, mp, fs); > + exit(0); > + } > + if (fork() == 0) { > + clear_sock(fd); > + exit(0); > + } > + while(wait(NULL) > 0) > + continue; > + > + close(fd); > + > + return 0; > +} > diff --git a/tests/nbd/003 b/tests/nbd/003 > new file mode 100644 > index 0000000..738928e > --- /dev/null > +++ b/tests/nbd/003 > @@ -0,0 +1,55 @@ > +#!/bin/bash > + > +# SPDX-License-Identifier: GPL-3.0+ > +# Copyright (C) 2019 Sun Ke > +# > +# Test nbd device resizing. Regression test for patch > +# > +# 2b5c8f0063e4 ("nbd: replace kill_bdev() with __invalidate_device() again") > + > + > +DESCRIPTION="resize a connected nbd device" > +QUICK=1 > + > +fs_type=ext4 > +disk_capacity=256M > +run_cnt=225 > + > +requires() { > + _have_nbd && _have_src_program mount_clear_sock > +} > + > +_start_nbd_mount_server() { > + > + fallocate -l $1 "${TMPDIR}/disk" > + > + if [[ "$2"x = "ext4"x ]]; then > + mkfs.ext4 "${TMPDIR}/disk" >> "$FULL" 2>&1 > + else > + mkdosfs "${TMPDIR}/disk" >> "$FULL" 2>&1 > + fi > + nbd-server 8000 "${TMPDIR}/disk" >> "$FULL" 2>&1 > + > + mkdir -p "${TMPDIR}/mount_point" > +} > + > +_stop_nbd_mount_server() { > + pkill -9 -f 8000 > + rm -f "${TMPDIR}/disk" > + rm -rf "${TMPDIR}/mount_point" > +} > + > +test() { > + echo "Running ${TEST_NAME}" > + > + _start_nbd_mount_server $disk_capacity $fs_type > + nbd-client localhost 8000 /dev/nbd0 >> "$FULL" 2>&1 > + > + for ((i = 0; i < $run_cnt; i++)) > + do > + src/mount_clear_sock "${TMPDIR}/mount_point" /dev/nbd0 $fs_type > + done > + > + nbd-client -d /dev/nbd0 > + _stop_nbd_mount_server > +} > diff --git a/tests/nbd/003.out b/tests/nbd/003.out > new file mode 100644 > index 0000000..aa340db > --- /dev/null > +++ b/tests/nbd/003.out > @@ -0,0 +1 @@ > +Running nbd/003 > -- > 2.13.6 >
