[01/11] migration: support file: uri for source migration

Commit Message

Nikolay Borisov Oct. 4, 2022, 12:37 p.m. UTC

Implement support for a "file:" uri so that a migration can be initiated
directly to a file from QEMU.

Signed-off-by: Nikolay Borisov <[e-mail]>
---
 migration/file.c      | 23 +++++++++++++++++++++++
 migration/file.h      |  9 +++++++++
 migration/meson.build |  1 +
 migration/migration.c |  3 +++
 4 files changed, 36 insertions(+)
 create mode 100644 migration/file.c
 create mode 100644 migration/file.h

Patch

diff --git a/migration/file.c b/migration/file.c
new file mode 100644
index 000000000000..02896a7cab99
--- /dev/null
+++ b/migration/file.c
@@ -0,0 +1,23 @@ 
+#include "qemu/osdep.h"
+#include "channel.h"
+#include "io/channel-file.h"
+#include "file.h"
+#include "qemu/error-report.h"
+
+
+void file_start_outgoing_migration(MigrationState *s, const char *fname, Error **errp)
+{
+	QIOChannelFile *ioc;
+
+	ioc = qio_channel_file_new_path(fname, O_CREAT|O_TRUNC|O_WRONLY, 0660, errp);
+	if (!ioc) {
+		error_report("Error creating a channel");
+		return;
+	}
+
+	qio_channel_set_name(QIO_CHANNEL(ioc), "migration-file-outgoing");
+	migration_channel_connect(s, QIO_CHANNEL(ioc), NULL, NULL);
+	object_unref(OBJECT(ioc));
+}
+
+
diff --git a/migration/file.h b/migration/file.h
new file mode 100644
index 000000000000..d476eb1157f9
--- /dev/null
+++ b/migration/file.h
@@ -0,0 +1,9 @@ 
+#ifndef QEMU_MIGRATION_FILE_H
+#define QEMU_MIGRATION_FILE_H
+
+void file_start_outgoing_migration(MigrationState *s,
+                                   const char *filename,
+                                   Error **errp);
+
+#endif
+
diff --git a/migration/meson.build b/migration/meson.build
index 690487cf1a81..30a8392701c3 100644
--- a/migration/meson.build
+++ b/migration/meson.build
@@ -17,6 +17,7 @@  softmmu_ss.add(files(
   'colo.c',
   'exec.c',
   'fd.c',
+  'file.c',
   'global_state.c',
   'migration.c',
   'multifd.c',
diff --git a/migration/migration.c b/migration/migration.c
index bb8bbddfe467..8813b78b9a6b 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -20,6 +20,7 @@ 
 #include "migration/blocker.h"
 #include "exec.h"
 #include "fd.h"
+#include "file.h"
 #include "socket.h"
 #include "sysemu/runstate.h"
 #include "sysemu/sysemu.h"
@@ -2414,6 +2415,8 @@  void qmp_migrate(const char *uri, bool has_blk, bool blk,
         exec_start_outgoing_migration(s, p, &local_err);
     } else if (strstart(uri, "fd:", &p)) {
         fd_start_outgoing_migration(s, p, &local_err);
+    } else if (strstart(uri, "file:", &p)) {
+	file_start_outgoing_migration(s, p, &local_err);
     } else {
         if (!(has_resume && resume)) {
             yank_unregister_instance(MIGRATION_YANK_INSTANCE);