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Reintroduce migrate-to-exec: support (Charles Duffy)

Browse source 
KVM's live migration support included support for exec: URLs, allowing system
state to be written or received via an arbitrary popen()ed subprocess. This
provides a convenient way to pipe state through a compression algorithm or an
arbitrary network transport on its way to its destination, and a convenient way
to write state to disk; libvirt's qemu driver currently uses migration to exec:
targets for this latter purpose.

This version of the patch refactors now-common code from migrate-tcp.c into
migrate.c. 

Signed-off-by: Charles Duffy <Charles_Duffy@messageone.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>



git-svn-id: svn://svn.savannah.nongnu.org/qemu/trunk@5694 c046a42c-6fe2-441c-8c8c-71466251a162
This commit is contained in:
aliguori 2008-11-11 16:46:33 +00:00
parent a74b4d2c23
commit 065e281356
7 changed files with 453 additions and 171 deletions
Download patch file Download diff file Expand all files Collapse all files

188
migration-tcp.c
View file

@ -22,16 +22,6 @@
//#define DEBUG_MIGRATION_TCP
typedef struct FdMigrationState
{
MigrationState mig_state;
QEMUFile *file;
int64_t bandwidth_limit;
int fd;
int detach;
int state;
} FdMigrationState;
#ifdef DEBUG_MIGRATION_TCP
#define dprintf(fmt, ...) \
do { printf("migration-tcp: " fmt, ## __VA_ARGS__); } while (0)
@ -40,64 +30,19 @@ typedef struct FdMigrationState
do { } while (0)
#endif
static void tcp_cleanup(FdMigrationState *s)
static int socket_errno(FdMigrationState *s)
{
qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);
if (s->file) {
dprintf("closing file\n");
qemu_fclose(s->file);
}
if (s->fd != -1)
close(s->fd);
/* Don't resume monitor until we've flushed all of the buffers */
if (s->detach == 2) {
monitor_resume();
s->detach = 0;
}
s->fd = -1;
return (s->get_error(s));
}
static void tcp_error(FdMigrationState *s)
static int socket_write(FdMigrationState *s, const void * buf, size_t size)
{
dprintf("setting error state\n");
s->state = MIG_STATE_ERROR;
tcp_cleanup(s);
return send(s->fd, buf, size, 0);
}
static void fd_put_notify(void *opaque)
static int tcp_close(FdMigrationState *s)
{
FdMigrationState *s = opaque;
qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);
qemu_file_put_notify(s->file);
}
static ssize_t fd_put_buffer(void *opaque, const void *data, size_t size)
{
FdMigrationState *s = opaque;
ssize_t ret;
do {
ret = send(s->fd, data, size, 0);
} while (ret == -1 && (socket_error() == EINTR || socket_error() == EWOULDBLOCK));
if (ret == -1)
ret = -socket_error();
if (ret == -EAGAIN)
qemu_set_fd_handler2(s->fd, NULL, NULL, fd_put_notify, s);
return ret;
}
static int fd_close(void *opaque)
{
FdMigrationState *s = opaque;
dprintf("fd_close\n");
dprintf("tcp_close\n");
if (s->fd != -1) {
close(s->fd);
s->fd = -1;
@ -105,67 +50,6 @@ static int fd_close(void *opaque)
return 0;
}
static void fd_wait_for_unfreeze(void *opaque)
{
FdMigrationState *s = opaque;
int ret;
dprintf("wait for unfreeze\n");
if (s->state != MIG_STATE_ACTIVE)
return;
do {
fd_set wfds;
FD_ZERO(&wfds);
FD_SET(s->fd, &wfds);
ret = select(s->fd + 1, NULL, &wfds, NULL, NULL);
} while (ret == -1 && socket_error() == EINTR);
}
static void fd_put_ready(void *opaque)
{
FdMigrationState *s = opaque;
if (s->state != MIG_STATE_ACTIVE) {
dprintf("put_ready returning because of non-active state\n");
return;
}
dprintf("iterate\n");
if (qemu_savevm_state_iterate(s->file) == 1) {
dprintf("done iterating\n");
vm_stop(0);
bdrv_flush_all();
qemu_savevm_state_complete(s->file);
s->state = MIG_STATE_COMPLETED;
tcp_cleanup(s);
}
}
static void tcp_connect_migrate(FdMigrationState *s)
{
int ret;
s->file = qemu_fopen_ops_buffered(s,
s->bandwidth_limit,
fd_put_buffer,
fd_put_ready,
fd_wait_for_unfreeze,
fd_close);
dprintf("beginning savevm\n");
ret = qemu_savevm_state_begin(s->file);
if (ret < 0) {
dprintf("failed, %d\n", ret);
tcp_error(s);
return;
}
fd_put_ready(s);
}
static void tcp_wait_for_connect(void *opaque)
{
@ -176,62 +60,23 @@ static void tcp_wait_for_connect(void *opaque)
dprintf("connect completed\n");
do {
ret = getsockopt(s->fd, SOL_SOCKET, SO_ERROR, &val, &valsize);
} while (ret == -1 && socket_error() == EINTR);
} while (ret == -1 && (s->get_error(s)) == EINTR);
if (ret < 0) {
tcp_error(s);
migrate_fd_error(s);
return;
}
qemu_set_fd_handler2(s->fd, NULL, NULL, NULL, NULL);
if (val == 0)
tcp_connect_migrate(s);
migrate_fd_connect(s);
else {
dprintf("error connecting %d\n", val);
tcp_error(s);
migrate_fd_error(s);
}
}
static FdMigrationState *to_fms(MigrationState *mig_state)
{
return container_of(mig_state, FdMigrationState, mig_state);
}
static int tcp_get_status(MigrationState *mig_state)
{
FdMigrationState *s = to_fms(mig_state);
return s->state;
}
static void tcp_cancel(MigrationState *mig_state)
{
FdMigrationState *s = to_fms(mig_state);
if (s->state != MIG_STATE_ACTIVE)
return;
dprintf("cancelling migration\n");
s->state = MIG_STATE_CANCELLED;
tcp_cleanup(s);
}
static void tcp_release(MigrationState *mig_state)
{
FdMigrationState *s = to_fms(mig_state);
dprintf("releasing state\n");
if (s->state == MIG_STATE_ACTIVE) {
s->state = MIG_STATE_CANCELLED;
tcp_cleanup(s);
}
free(s);
}
MigrationState *tcp_start_outgoing_migration(const char *host_port,
int64_t bandwidth_limit,
int async)
@ -247,9 +92,12 @@ MigrationState *tcp_start_outgoing_migration(const char *host_port,
if (s == NULL)
return NULL;
s->mig_state.cancel = tcp_cancel;
s->mig_state.get_status = tcp_get_status;
s->mig_state.release = tcp_release;
s->get_error = socket_errno;
s->write = socket_write;
s->close = tcp_close;
s->mig_state.cancel = migrate_fd_cancel;
s->mig_state.get_status = migrate_fd_get_status;
s->mig_state.release = migrate_fd_release;
s->state = MIG_STATE_ACTIVE;
s->detach = !async;
@ -271,7 +119,7 @@ MigrationState *tcp_start_outgoing_migration(const char *host_port,
do {
ret = connect(s->fd, (struct sockaddr *)&addr, sizeof(addr));
if (ret == -1)
ret = -socket_error();
ret = -(s->get_error(s));
if (ret == -EINPROGRESS || ret == -EWOULDBLOCK)
qemu_set_fd_handler2(s->fd, NULL, NULL, tcp_wait_for_connect, s);
@ -283,7 +131,7 @@ MigrationState *tcp_start_outgoing_migration(const char *host_port,
qemu_free(s);
return NULL;
} else if (ret >= 0)
tcp_connect_migrate(s);
migrate_fd_connect(s);
return &s->mig_state;
}