@@ -255,18 +255,23 @@ struct NbdClientOpts {
char *device;
char *srcpath;
SocketAddress *saddr;
+ int stderr;
bool fork_process;
bool verbose;
};
-static void nbd_client_release_pipe(void)
+static void nbd_client_release_pipe(int old_stderr)
{
/* Close stderr so that the qemu-nbd process exits. */
- if (dup2(STDOUT_FILENO, STDERR_FILENO) < 0) {
+ if (dup2(old_stderr, STDERR_FILENO) < 0) {
error_report("Could not release pipe to parent: %s",
strerror(errno));
exit(EXIT_FAILURE);
}
+ if (old_stderr != STDOUT_FILENO && close(old_stderr) < 0) {
+ error_report("Could not release qemu-nbd: %s", strerror(errno));
+ exit(EXIT_FAILURE);
+ }
}
#if HAVE_NBD_DEVICE
@@ -332,7 +337,7 @@ static void *nbd_client_thread(void *arg)
fprintf(stderr, "NBD device %s is now connected to %s\n",
opts->device, opts->srcpath);
} else {
- nbd_client_release_pipe();
+ nbd_client_release_pipe(opts->stderr);
}
if (nbd_client(fd) < 0) {
@@ -597,6 +602,7 @@ int main(int argc, char **argv)
.device = NULL,
.srcpath = NULL,
.saddr = NULL,
+ .stderr = STDOUT_FILENO,
};
#ifdef CONFIG_POSIX
@@ -951,6 +957,16 @@ int main(int argc, char **argv)
close(stderr_fd[0]);
+ /* Remember parent's stderr if we will be restoring it. */
+ if (opts.verbose /* fork_process is set */) {
+ opts.stderr = dup(STDERR_FILENO);
+ if (opts.stderr < 0) {
+ error_report("Could not dup original stderr: %s",
+ strerror(errno));
+ exit(EXIT_FAILURE);
+ }
+ }
+
ret = qemu_daemon(1, 0);
saved_errno = errno; /* dup2 will overwrite error below */
@@ -1181,7 +1197,7 @@ int main(int argc, char **argv)
}
if (opts.fork_process) {
- nbd_client_release_pipe();
+ nbd_client_release_pipe(opts.stderr);
}
state = RUNNING;
Closing stderr earlier is good for daemonized qemu-nbd under ssh earlier, but breaks the case where -v is being used to track what is happening in the server, as in iotest 233. When we know we are verbose, we should preserve original stderr and restore it once the setup stage is done. This commit restores the original behavior with -v option. In this case original output inside the test is kept intact. Reported-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Denis V. Lunev <den@openvz.org> CC: Eric Blake <eblake@redhat.com> CC: Vladimir Sementsov-Ogievskiy <vsementsov@yandex-team.ru> CC: Hanna Reitz <hreitz@redhat.com> CC: Mike Maslenkin <mike.maslenkin@gmail.com> Fixes: 5c56dd27a2 ("qemu-nbd: fix regression with qemu-nbd --fork run over ssh") --- qemu-nbd.c | 24 ++++++++++++++++++++---- 1 file changed, 20 insertions(+), 4 deletions(-)