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From 23d81ee7564084f29e32fedaed5196ae1a5a3240 Mon Sep 17 00:00:00 2001
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From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>
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Date: Mon, 27 Jan 2020 19:01:10 +0100
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Subject: [PATCH 039/116] virtiofsd: add --print-capabilities option
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Dr. David Alan Gilbert <dgilbert@redhat.com>
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Message-id: <20200127190227.40942-36-dgilbert@redhat.com>
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Patchwork-id: 93486
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O-Subject: [RHEL-AV-8.2 qemu-kvm PATCH 035/112] virtiofsd: add --print-capabilities option
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Bugzilla: 1694164
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RH-Acked-by: Philippe Mathieu-Daudé <philmd@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Acked-by: Sergio Lopez Pascual <slp@redhat.com>
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From: Stefan Hajnoczi <stefanha@redhat.com>
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Add the --print-capabilities option as per vhost-user.rst "Backend
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programs conventions". Currently there are no advertised features.
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
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Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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(cherry picked from commit 45018fbb0a73ce66fd3dd87ecd2872b45658add4)
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Signed-off-by: Miroslav Rezanina <mrezanin@redhat.com>
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---
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docs/interop/vhost-user.json | 4 +++-
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tools/virtiofsd/fuse_lowlevel.h | 1 +
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tools/virtiofsd/helper.c | 2 ++
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tools/virtiofsd/passthrough_ll.c | 12 ++++++++++++
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4 files changed, 18 insertions(+), 1 deletion(-)
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diff --git a/docs/interop/vhost-user.json b/docs/interop/vhost-user.json
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index da6aaf5..d4ea1f7 100644
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--- a/docs/interop/vhost-user.json
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+++ b/docs/interop/vhost-user.json
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@@ -31,6 +31,7 @@
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# @rproc-serial: virtio remoteproc serial link
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# @scsi: virtio scsi
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# @vsock: virtio vsock transport
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+# @fs: virtio fs (since 4.2)
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#
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# Since: 4.0
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##
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@@ -50,7 +51,8 @@
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'rpmsg',
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'rproc-serial',
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'scsi',
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- 'vsock'
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+ 'vsock',
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+ 'fs'
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]
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}
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diff --git a/tools/virtiofsd/fuse_lowlevel.h b/tools/virtiofsd/fuse_lowlevel.h
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index f6b3470..0d61df8 100644
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--- a/tools/virtiofsd/fuse_lowlevel.h
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+++ b/tools/virtiofsd/fuse_lowlevel.h
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@@ -1794,6 +1794,7 @@ struct fuse_cmdline_opts {
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int nodefault_subtype;
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int show_version;
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int show_help;
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+ int print_capabilities;
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unsigned int max_idle_threads;
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};
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diff --git a/tools/virtiofsd/helper.c b/tools/virtiofsd/helper.c
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index a3645fc..b8ec5ac 100644
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--- a/tools/virtiofsd/helper.c
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+++ b/tools/virtiofsd/helper.c
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@@ -40,6 +40,7 @@ static const struct fuse_opt fuse_helper_opts[] = {
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FUSE_HELPER_OPT("--help", show_help),
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FUSE_HELPER_OPT("-V", show_version),
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FUSE_HELPER_OPT("--version", show_version),
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+ FUSE_HELPER_OPT("--print-capabilities", print_capabilities),
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FUSE_HELPER_OPT("-d", debug),
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FUSE_HELPER_OPT("debug", debug),
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FUSE_HELPER_OPT("-d", foreground),
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@@ -135,6 +136,7 @@ void fuse_cmdline_help(void)
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{
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printf(" -h --help print help\n"
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" -V --version print version\n"
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+ " --print-capabilities print vhost-user.json\n"
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" -d -o debug enable debug output (implies -f)\n"
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" -f foreground operation\n"
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" --daemonize run in background\n"
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diff --git a/tools/virtiofsd/passthrough_ll.c b/tools/virtiofsd/passthrough_ll.c
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index 037c5d7..cd27c09 100644
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--- a/tools/virtiofsd/passthrough_ll.c
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+++ b/tools/virtiofsd/passthrough_ll.c
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@@ -1298,6 +1298,14 @@ static struct fuse_lowlevel_ops lo_oper = {
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.lseek = lo_lseek,
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};
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+/* Print vhost-user.json backend program capabilities */
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+static void print_capabilities(void)
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+{
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+ printf("{\n");
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+ printf(" \"type\": \"fs\"\n");
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+ printf("}\n");
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+}
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+
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int main(int argc, char *argv[])
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{
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struct fuse_args args = FUSE_ARGS_INIT(argc, argv);
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@@ -1328,6 +1336,10 @@ int main(int argc, char *argv[])
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fuse_lowlevel_version();
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ret = 0;
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goto err_out1;
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+ } else if (opts.print_capabilities) {
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+ print_capabilities();
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+ ret = 0;
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+ goto err_out1;
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}
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if (fuse_opt_parse(&args, &lo, lo_opts, NULL) == -1) {
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--
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1.8.3.1
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