mirror of
https://github.com/xemu-project/xemu.git
synced 2024-11-25 04:30:02 +00:00
a9940fc4cb
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Luiz Capitulino <lcapitulino@redhat.com> Reviewed-by: Markus Armbruster <armbru@redhat.com>
129 lines
2.9 KiB
C
129 lines
2.9 KiB
C
/*
|
|
* QEMU live migration via generic fd
|
|
*
|
|
* Copyright Red Hat, Inc. 2009
|
|
*
|
|
* Authors:
|
|
* Chris Lalancette <clalance@redhat.com>
|
|
*
|
|
* This work is licensed under the terms of the GNU GPL, version 2. See
|
|
* the COPYING file in the top-level directory.
|
|
*
|
|
* Contributions after 2012-01-13 are licensed under the terms of the
|
|
* GNU GPL, version 2 or (at your option) any later version.
|
|
*/
|
|
|
|
#include "qemu-common.h"
|
|
#include "qemu_socket.h"
|
|
#include "migration.h"
|
|
#include "monitor.h"
|
|
#include "qemu-char.h"
|
|
#include "buffered_file.h"
|
|
#include "block.h"
|
|
#include "qemu_socket.h"
|
|
|
|
//#define DEBUG_MIGRATION_FD
|
|
|
|
#ifdef DEBUG_MIGRATION_FD
|
|
#define DPRINTF(fmt, ...) \
|
|
do { printf("migration-fd: " fmt, ## __VA_ARGS__); } while (0)
|
|
#else
|
|
#define DPRINTF(fmt, ...) \
|
|
do { } while (0)
|
|
#endif
|
|
|
|
static int fd_errno(MigrationState *s)
|
|
{
|
|
return errno;
|
|
}
|
|
|
|
static int fd_write(MigrationState *s, const void * buf, size_t size)
|
|
{
|
|
return write(s->fd, buf, size);
|
|
}
|
|
|
|
static int fd_close(MigrationState *s)
|
|
{
|
|
struct stat st;
|
|
int ret;
|
|
|
|
DPRINTF("fd_close\n");
|
|
if (s->fd != -1) {
|
|
ret = fstat(s->fd, &st);
|
|
if (ret == 0 && S_ISREG(st.st_mode)) {
|
|
/*
|
|
* If the file handle is a regular file make sure the
|
|
* data is flushed to disk before signaling success.
|
|
*/
|
|
ret = fsync(s->fd);
|
|
if (ret != 0) {
|
|
ret = -errno;
|
|
perror("migration-fd: fsync");
|
|
return ret;
|
|
}
|
|
}
|
|
ret = close(s->fd);
|
|
s->fd = -1;
|
|
if (ret != 0) {
|
|
ret = -errno;
|
|
perror("migration-fd: close");
|
|
return ret;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int fd_start_outgoing_migration(MigrationState *s, const char *fdname)
|
|
{
|
|
s->fd = monitor_get_fd(cur_mon, fdname, NULL);
|
|
if (s->fd == -1) {
|
|
DPRINTF("fd_migration: invalid file descriptor identifier\n");
|
|
goto err_after_get_fd;
|
|
}
|
|
|
|
if (fcntl(s->fd, F_SETFL, O_NONBLOCK) == -1) {
|
|
DPRINTF("Unable to set nonblocking mode on file descriptor\n");
|
|
goto err_after_open;
|
|
}
|
|
|
|
s->get_error = fd_errno;
|
|
s->write = fd_write;
|
|
s->close = fd_close;
|
|
|
|
migrate_fd_connect(s);
|
|
return 0;
|
|
|
|
err_after_open:
|
|
close(s->fd);
|
|
err_after_get_fd:
|
|
return -1;
|
|
}
|
|
|
|
static void fd_accept_incoming_migration(void *opaque)
|
|
{
|
|
QEMUFile *f = opaque;
|
|
|
|
process_incoming_migration(f);
|
|
qemu_set_fd_handler2(qemu_stdio_fd(f), NULL, NULL, NULL, NULL);
|
|
qemu_fclose(f);
|
|
}
|
|
|
|
int fd_start_incoming_migration(const char *infd)
|
|
{
|
|
int fd;
|
|
QEMUFile *f;
|
|
|
|
DPRINTF("Attempting to start an incoming migration via fd\n");
|
|
|
|
fd = strtol(infd, NULL, 0);
|
|
f = qemu_fdopen(fd, "rb");
|
|
if(f == NULL) {
|
|
DPRINTF("Unable to apply qemu wrapper to file descriptor\n");
|
|
return -errno;
|
|
}
|
|
|
|
qemu_set_fd_handler2(fd, NULL, fd_accept_incoming_migration, NULL, f);
|
|
|
|
return 0;
|
|
}
|