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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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