File:  [Qemu by Fabrice Bellard] / qemu / migration-fd.c
Revision 1.1.1.3 (vendor branch): download - view: text, annotated - select for diffs
Tue Apr 24 18:55:36 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 via generic fd
    3:  *
    4:  * Copyright Red Hat, Inc. 2009
    5:  *
    6:  * Authors:
    7:  *  Chris Lalancette <clalance@redhat.com>
    8:  *
    9:  * This work is licensed under the terms of the GNU GPL, version 2.  See
   10:  * the COPYING file in the top-level directory.
   11:  *
   12:  */
   13: 
   14: #include "qemu-common.h"
   15: #include "qemu_socket.h"
   16: #include "migration.h"
   17: #include "monitor.h"
   18: #include "qemu-char.h"
   19: #include "buffered_file.h"
   20: #include "block.h"
   21: #include "qemu_socket.h"
   22: 
   23: //#define DEBUG_MIGRATION_FD
   24: 
   25: #ifdef DEBUG_MIGRATION_FD
   26: #define DPRINTF(fmt, ...) \
   27:     do { printf("migration-fd: " fmt, ## __VA_ARGS__); } while (0)
   28: #else
   29: #define DPRINTF(fmt, ...) \
   30:     do { } while (0)
   31: #endif
   32: 
   33: static int fd_errno(FdMigrationState *s)
   34: {
   35:     return errno;
   36: }
   37: 
   38: static int fd_write(FdMigrationState *s, const void * buf, size_t size)
   39: {
   40:     return write(s->fd, buf, size);
   41: }
   42: 
   43: static int fd_close(FdMigrationState *s)
   44: {
   45:     DPRINTF("fd_close\n");
   46:     if (s->fd != -1) {
   47:         close(s->fd);
   48:         s->fd = -1;
   49:     }
   50:     return 0;
   51: }
   52: 
   53: MigrationState *fd_start_outgoing_migration(Monitor *mon,
   54: 					    const char *fdname,
   55: 					    int64_t bandwidth_limit,
   56: 					    int detach,
   57: 					    int blk,
   58: 					    int inc)
   59: {
   60:     FdMigrationState *s;
   61: 
   62:     s = qemu_mallocz(sizeof(*s));
   63: 
   64:     s->fd = monitor_get_fd(mon, fdname);
   65:     if (s->fd == -1) {
   66:         DPRINTF("fd_migration: invalid file descriptor identifier\n");
   67:         goto err_after_alloc;
   68:     }
   69: 
   70:     if (fcntl(s->fd, F_SETFL, O_NONBLOCK) == -1) {
   71:         DPRINTF("Unable to set nonblocking mode on file descriptor\n");
   72:         goto err_after_open;
   73:     }
   74: 
   75:     s->get_error = fd_errno;
   76:     s->write = fd_write;
   77:     s->close = fd_close;
   78:     s->mig_state.cancel = migrate_fd_cancel;
   79:     s->mig_state.get_status = migrate_fd_get_status;
   80:     s->mig_state.release = migrate_fd_release;
   81: 
   82:     s->mig_state.blk = blk;
   83:     s->mig_state.shared = inc;
   84: 
   85:     s->state = MIG_STATE_ACTIVE;
   86:     s->mon = NULL;
   87:     s->bandwidth_limit = bandwidth_limit;
   88: 
   89:     if (!detach) {
   90:         migrate_fd_monitor_suspend(s, mon);
   91:     }
   92: 
   93:     migrate_fd_connect(s);
   94:     return &s->mig_state;
   95: 
   96: err_after_open:
   97:     close(s->fd);
   98: err_after_alloc:
   99:     qemu_free(s);
  100:     return NULL;
  101: }
  102: 
  103: static void fd_accept_incoming_migration(void *opaque)
  104: {
  105:     QEMUFile *f = opaque;
  106: 
  107:     process_incoming_migration(f);
  108:     qemu_set_fd_handler2(qemu_stdio_fd(f), NULL, NULL, NULL, NULL);
  109:     qemu_fclose(f);
  110: }
  111: 
  112: int fd_start_incoming_migration(const char *infd)
  113: {
  114:     int fd;
  115:     QEMUFile *f;
  116: 
  117:     DPRINTF("Attempting to start an incoming migration via fd\n");
  118: 
  119:     fd = strtol(infd, NULL, 0);
  120:     f = qemu_fdopen(fd, "rb");
  121:     if(f == NULL) {
  122:         DPRINTF("Unable to apply qemu wrapper to file descriptor\n");
  123:         return -errno;
  124:     }
  125: 
  126:     qemu_set_fd_handler2(fd, NULL, fd_accept_incoming_migration, NULL, f);
  127: 
  128:     return 0;
  129: }

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