File:  [Qemu by Fabrice Bellard] / qemu / migration-exec.c
Revision 1.1.1.5 (vendor branch): download - view: text, annotated - select for diffs
Tue Apr 24 18:56:53 2018 UTC (3 years, 1 month ago) by root
Branches: qemu, MAIN
CVS tags: qemu1000, qemu0151, HEAD
qemu 0.15.1

    1: /*
    2:  * QEMU live migration
    3:  *
    4:  * Copyright IBM, Corp. 2008
    5:  * Copyright Dell MessageOne 2008
    6:  *
    7:  * Authors:
    8:  *  Anthony Liguori   <aliguori@us.ibm.com>
    9:  *  Charles Duffy     <charles_duffy@messageone.com>
   10:  *
   11:  * This work is licensed under the terms of the GNU GPL, version 2.  See
   12:  * the COPYING file in the top-level directory.
   13:  *
   14:  */
   15: 
   16: #include "qemu-common.h"
   17: #include "qemu_socket.h"
   18: #include "migration.h"
   19: #include "qemu-char.h"
   20: #include "buffered_file.h"
   21: #include "block.h"
   22: #include <sys/types.h>
   23: #include <sys/wait.h>
   24: 
   25: //#define DEBUG_MIGRATION_EXEC
   26: 
   27: #ifdef DEBUG_MIGRATION_EXEC
   28: #define DPRINTF(fmt, ...) \
   29:     do { printf("migration-exec: " fmt, ## __VA_ARGS__); } while (0)
   30: #else
   31: #define DPRINTF(fmt, ...) \
   32:     do { } while (0)
   33: #endif
   34: 
   35: static int file_errno(FdMigrationState *s)
   36: {
   37:     return errno;
   38: }
   39: 
   40: static int file_write(FdMigrationState *s, const void * buf, size_t size)
   41: {
   42:     return write(s->fd, buf, size);
   43: }
   44: 
   45: static int exec_close(FdMigrationState *s)
   46: {
   47:     int ret = 0;
   48:     DPRINTF("exec_close\n");
   49:     if (s->opaque) {
   50:         ret = qemu_fclose(s->opaque);
   51:         s->opaque = NULL;
   52:         s->fd = -1;
   53:         if (ret != -1 &&
   54:             WIFEXITED(ret)
   55:             && WEXITSTATUS(ret) == 0) {
   56:             ret = 0;
   57:         } else {
   58:             ret = -1;
   59:         }
   60:     }
   61:     return ret;
   62: }
   63: 
   64: MigrationState *exec_start_outgoing_migration(Monitor *mon,
   65:                                               const char *command,
   66: 					      int64_t bandwidth_limit,
   67: 					      int detach,
   68: 					      int blk,
   69: 					      int inc)
   70: {
   71:     FdMigrationState *s;
   72:     FILE *f;
   73: 
   74:     s = qemu_mallocz(sizeof(*s));
   75: 
   76:     f = popen(command, "w");
   77:     if (f == NULL) {
   78:         DPRINTF("Unable to popen exec target\n");
   79:         goto err_after_alloc;
   80:     }
   81: 
   82:     s->fd = fileno(f);
   83:     if (s->fd == -1) {
   84:         DPRINTF("Unable to retrieve file descriptor for popen'd handle\n");
   85:         goto err_after_open;
   86:     }
   87: 
   88:     socket_set_nonblock(s->fd);
   89: 
   90:     s->opaque = qemu_popen(f, "w");
   91: 
   92:     s->close = exec_close;
   93:     s->get_error = file_errno;
   94:     s->write = file_write;
   95:     s->mig_state.cancel = migrate_fd_cancel;
   96:     s->mig_state.get_status = migrate_fd_get_status;
   97:     s->mig_state.release = migrate_fd_release;
   98: 
   99:     s->mig_state.blk = blk;
  100:     s->mig_state.shared = inc;
  101: 
  102:     s->state = MIG_STATE_ACTIVE;
  103:     s->mon = NULL;
  104:     s->bandwidth_limit = bandwidth_limit;
  105: 
  106:     if (!detach) {
  107:         migrate_fd_monitor_suspend(s, mon);
  108:     }
  109: 
  110:     migrate_fd_connect(s);
  111:     return &s->mig_state;
  112: 
  113: err_after_open:
  114:     pclose(f);
  115: err_after_alloc:
  116:     qemu_free(s);
  117:     return NULL;
  118: }
  119: 
  120: static void exec_accept_incoming_migration(void *opaque)
  121: {
  122:     QEMUFile *f = opaque;
  123: 
  124:     process_incoming_migration(f);
  125:     qemu_set_fd_handler2(qemu_stdio_fd(f), NULL, NULL, NULL, NULL);
  126:     qemu_fclose(f);
  127: }
  128: 
  129: int exec_start_incoming_migration(const char *command)
  130: {
  131:     QEMUFile *f;
  132: 
  133:     DPRINTF("Attempting to start an incoming migration\n");
  134:     f = qemu_popen_cmd(command, "r");
  135:     if(f == NULL) {
  136:         DPRINTF("Unable to apply qemu wrapper to popen file\n");
  137:         return -errno;
  138:     }
  139: 
  140:     qemu_set_fd_handler2(qemu_stdio_fd(f), NULL,
  141: 			 exec_accept_incoming_migration, NULL, f);
  142: 
  143:     return 0;
  144: }

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