Skip to content
This repository

HTTPS clone URL

Subversion checkout URL

You can clone with HTTPS or Subversion.

Download ZIP
Fetching contributors…

Cannot retrieve contributors at this time

file 145 lines (121 sloc) 3.203 kb
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145
/*
* QEMU live migration
*
* Copyright IBM, Corp. 2008
* Copyright Dell MessageOne 2008
*
* Authors:
* Anthony Liguori <aliguori@us.ibm.com>
* Charles Duffy <charles_duffy@messageone.com>
*
* This work is licensed under the terms of the GNU GPL, version 2. See
* the COPYING file in the top-level directory.
*
*/

#include "qemu-common.h"
#include "qemu_socket.h"
#include "migration.h"
#include "qemu-char.h"
#include "sysemu.h"
#include "buffered_file.h"
#include "block.h"
#include <sys/types.h>
#include <sys/wait.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

static int file_errno(FdMigrationState *s)
{
    return errno;
}

static int file_write(FdMigrationState *s, const void * buf, size_t size)
{
    return write(s->fd, buf, size);
}

static int exec_close(FdMigrationState *s)
{
    int ret = 0;
    DPRINTF("exec_close\n");
    if (s->opaque) {
        ret = qemu_fclose(s->opaque);
        s->opaque = NULL;
        s->fd = -1;
        if (ret != -1 &&
            WIFEXITED(ret)
            && WEXITSTATUS(ret) == 0) {
            ret = 0;
        } else {
            ret = -1;
        }
    }
    return ret;
}

MigrationState *exec_start_outgoing_migration(Monitor *mon,
                                              const char *command,
int64_t bandwidth_limit,
int detach,
int blk,
int inc)
{
    FdMigrationState *s;
    FILE *f;

    s = qemu_mallocz(sizeof(*s));

    f = popen(command, "w");
    if (f == NULL) {
        DPRINTF("Unable to popen exec target\n");
        goto err_after_alloc;
    }

    s->fd = fileno(f);
    if (s->fd == -1) {
        DPRINTF("Unable to retrieve file descriptor for popen'd handle\n");
        goto err_after_open;
    }

    socket_set_nonblock(s->fd);

    s->opaque = qemu_popen(f, "w");

    s->close = exec_close;
    s->get_error = file_errno;
    s->write = file_write;
    s->mig_state.cancel = migrate_fd_cancel;
    s->mig_state.get_status = migrate_fd_get_status;
    s->mig_state.release = migrate_fd_release;

    s->mig_state.blk = blk;
    s->mig_state.shared = inc;

    s->state = MIG_STATE_ACTIVE;
    s->mon = NULL;
    s->bandwidth_limit = bandwidth_limit;

    if (!detach) {
        migrate_fd_monitor_suspend(s, mon);
    }

    migrate_fd_connect(s);
    return &s->mig_state;

err_after_open:
    pclose(f);
err_after_alloc:
    qemu_free(s);
    return NULL;
}

static void exec_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 exec_start_incoming_migration(const char *command)
{
    QEMUFile *f;

    DPRINTF("Attempting to start an incoming migration\n");
    f = qemu_popen_cmd(command, "r");
    if(f == NULL) {
        DPRINTF("Unable to apply qemu wrapper to popen file\n");
        return -errno;
    }

    qemu_set_fd_handler2(qemu_stdio_fd(f), NULL,
exec_accept_incoming_migration, NULL, f);

    return 0;
}
Something went wrong with that request. Please try again.