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[Qemu-devel] [PULL 16/28] migration: convert exec socket protocol to use
From: |
Amit Shah |
Subject: |
[Qemu-devel] [PULL 16/28] migration: convert exec socket protocol to use QIOChannel |
Date: |
Thu, 26 May 2016 11:42:07 +0530 |
From: "Daniel P. Berrange" <address@hidden>
Convert the exec socket migration protocol driver to use
QIOChannel and QEMUFileChannel, instead of the stdio
popen APIs. It can be unconditionally built because the
QIOChannelCommand class can report suitable error messages
on platforms which can't fork processes.
Reviewed-by: Dr. David Alan Gilbert <address@hidden>
Signed-off-by: Daniel P. Berrange <address@hidden>
Message-Id: <address@hidden>
Signed-off-by: Amit Shah <address@hidden>
---
migration/Makefile.objs | 3 +--
migration/exec.c | 62 +++++++++++++++++++++++++------------------------
migration/migration.c | 4 ----
trace-events | 4 ++++
4 files changed, 37 insertions(+), 36 deletions(-)
diff --git a/migration/Makefile.objs b/migration/Makefile.objs
index 2e5040c..c73fb8a 100644
--- a/migration/Makefile.objs
+++ b/migration/Makefile.objs
@@ -1,4 +1,4 @@
-common-obj-y += migration.o socket.o fd.o
+common-obj-y += migration.o socket.o fd.o exec.o
common-obj-y += vmstate.o
common-obj-y += qemu-file.o qemu-file-buf.o qemu-file-unix.o qemu-file-stdio.o
common-obj-y += qemu-file-channel.o
@@ -6,7 +6,6 @@ common-obj-y += xbzrle.o postcopy-ram.o
common-obj-y += qjson.o
common-obj-$(CONFIG_RDMA) += rdma.o
-common-obj-$(CONFIG_POSIX) += exec.o
common-obj-y += block.o
diff --git a/migration/exec.c b/migration/exec.c
index 5594209..c825e27 100644
--- a/migration/exec.c
+++ b/migration/exec.c
@@ -3,10 +3,12 @@
*
* Copyright IBM, Corp. 2008
* Copyright Dell MessageOne 2008
+ * Copyright Red Hat, Inc. 2015-2016
*
* Authors:
* Anthony Liguori <address@hidden>
* Charles Duffy <address@hidden>
+ * Daniel P. Berrange <address@hidden>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
@@ -18,53 +20,53 @@
#include "qemu/osdep.h"
#include "qapi/error.h"
#include "qemu-common.h"
-#include "qemu/sockets.h"
-#include "qemu/main-loop.h"
#include "migration/migration.h"
-#include "migration/qemu-file.h"
-#include "block/block.h"
-#include <sys/wait.h>
+#include "io/channel-command.h"
+#include "trace.h"
-//#define DEBUG_MIGRATION_EXEC
-
-#ifdef DEBUG_MIGRATION_EXEC
-#define DPRINTF(fmt, ...) \
- do { printf("migration-exec: " fmt, ## __VA_ARGS__); } while (0)
-#else
-#define DPRINTF(fmt, ...) \
- do { } while (0)
-#endif
void exec_start_outgoing_migration(MigrationState *s, const char *command,
Error **errp)
{
- s->to_dst_file = qemu_popen_cmd(command, "w");
- if (s->to_dst_file == NULL) {
- error_setg_errno(errp, errno, "failed to popen the migration target");
+ QIOChannel *ioc;
+ const char *argv[] = { "/bin/sh", "-c", command, NULL };
+
+ trace_migration_exec_outgoing(command);
+ ioc = QIO_CHANNEL(qio_channel_command_new_spawn(argv,
+ O_WRONLY,
+ errp));
+ if (!ioc) {
return;
}
- migrate_fd_connect(s);
+ migration_set_outgoing_channel(s, ioc);
+ object_unref(OBJECT(ioc));
}
-static void exec_accept_incoming_migration(void *opaque)
+static gboolean exec_accept_incoming_migration(QIOChannel *ioc,
+ GIOCondition condition,
+ gpointer opaque)
{
- QEMUFile *f = opaque;
-
- qemu_set_fd_handler(qemu_get_fd(f), NULL, NULL, NULL);
- process_incoming_migration(f);
+ migration_set_incoming_channel(migrate_get_current(), ioc);
+ object_unref(OBJECT(ioc));
+ return FALSE; /* unregister */
}
void exec_start_incoming_migration(const char *command, Error **errp)
{
- QEMUFile *f;
+ QIOChannel *ioc;
+ const char *argv[] = { "/bin/sh", "-c", command, NULL };
- DPRINTF("Attempting to start an incoming migration\n");
- f = qemu_popen_cmd(command, "r");
- if(f == NULL) {
- error_setg_errno(errp, errno, "failed to popen the migration source");
+ trace_migration_exec_incoming(command);
+ ioc = QIO_CHANNEL(qio_channel_command_new_spawn(argv,
+ O_RDONLY,
+ errp));
+ if (!ioc) {
return;
}
- qemu_set_fd_handler(qemu_get_fd(f), exec_accept_incoming_migration, NULL,
- f);
+ qio_channel_add_watch(ioc,
+ G_IO_IN,
+ exec_accept_incoming_migration,
+ NULL,
+ NULL);
}
diff --git a/migration/migration.c b/migration/migration.c
index 8decc7d..695384b 100644
--- a/migration/migration.c
+++ b/migration/migration.c
@@ -311,10 +311,8 @@ void qemu_start_incoming_migration(const char *uri, Error
**errp)
} else if (strstart(uri, "rdma:", &p)) {
rdma_start_incoming_migration(p, errp);
#endif
-#if !defined(WIN32)
} else if (strstart(uri, "exec:", &p)) {
exec_start_incoming_migration(p, errp);
-#endif
} else if (strstart(uri, "unix:", &p)) {
unix_start_incoming_migration(p, errp);
} else if (strstart(uri, "fd:", &p)) {
@@ -1069,10 +1067,8 @@ void qmp_migrate(const char *uri, bool has_blk, bool blk,
} else if (strstart(uri, "rdma:", &p)) {
rdma_start_outgoing_migration(s, p, &local_err);
#endif
-#if !defined(WIN32)
} else if (strstart(uri, "exec:", &p)) {
exec_start_outgoing_migration(s, p, &local_err);
-#endif
} else if (strstart(uri, "unix:", &p)) {
unix_start_outgoing_migration(s, p, &local_err);
} else if (strstart(uri, "fd:", &p)) {
diff --git a/trace-events b/trace-events
index e9945e7..1584b0a 100644
--- a/trace-events
+++ b/trace-events
@@ -1595,6 +1595,10 @@ postcopy_ram_incoming_cleanup_entry(void) ""
postcopy_ram_incoming_cleanup_exit(void) ""
postcopy_ram_incoming_cleanup_join(void) ""
+# migration/exec.c
+migration_exec_outgoing(const char *cmd) "cmd=%s"
+migration_exec_incoming(const char *cmd) "cmd=%s"
+
# migration/fd.c
migration_fd_outgoing(int fd) "fd=%d"
migration_fd_incoming(int fd) "fd=%d"
--
2.5.5
- [Qemu-devel] [PULL 06/28] migration: introduce set_blocking function in QEMUFileOps, (continued)
- [Qemu-devel] [PULL 06/28] migration: introduce set_blocking function in QEMUFileOps, Amit Shah, 2016/05/26
- [Qemu-devel] [PULL 11/28] migration: convert post-copy to use QIOChannelBuffer, Amit Shah, 2016/05/26
- [Qemu-devel] [PULL 08/28] migration: introduce a new QEMUFile impl based on QIOChannel, Amit Shah, 2016/05/26
- [Qemu-devel] [PULL 12/28] migration: convert unix socket protocol to use QIOChannel, Amit Shah, 2016/05/26
- [Qemu-devel] [PULL 09/28] migration: add helpers for creating QEMUFile from a QIOChannel, Amit Shah, 2016/05/26
- [Qemu-devel] [PULL 10/28] migration: add reporting of errors for outgoing migration, Amit Shah, 2016/05/26
- [Qemu-devel] [PULL 13/28] migration: rename unix.c to socket.c, Amit Shah, 2016/05/26
- [Qemu-devel] [PULL 15/28] migration: convert fd socket protocol to use QIOChannel, Amit Shah, 2016/05/26
- [Qemu-devel] [PULL 14/28] migration: convert tcp socket protocol to use QIOChannel, Amit Shah, 2016/05/26
- [Qemu-devel] [PULL 16/28] migration: convert exec socket protocol to use QIOChannel,
Amit Shah <=
- [Qemu-devel] [PULL 17/28] migration: convert RDMA to use QIOChannel interface, Amit Shah, 2016/05/26
- [Qemu-devel] [PULL 18/28] migration: convert savevm to use QIOChannel for writing to files, Amit Shah, 2016/05/26
- [Qemu-devel] [PULL 20/28] migration: delete QEMUSizedBuffer struct, Amit Shah, 2016/05/26
- [Qemu-devel] [PULL 19/28] migration: delete QEMUFile buffer implementation, Amit Shah, 2016/05/26
- [Qemu-devel] [PULL 21/28] migration: delete QEMUFile sockets implementation, Amit Shah, 2016/05/26
- [Qemu-devel] [PULL 22/28] migration: delete QEMUFile stdio implementation, Amit Shah, 2016/05/26
- [Qemu-devel] [PULL 24/28] migration: don't use an array for storing migrate parameters, Amit Shah, 2016/05/26
- [Qemu-devel] [PULL 23/28] migration: move definition of struct QEMUFile back into qemu-file.c, Amit Shah, 2016/05/26
- [Qemu-devel] [PULL 25/28] migration: define 'tls-creds' and 'tls-hostname' migration parameters, Amit Shah, 2016/05/26