qga/commands-posix.c

   1 /*
   2  * QEMU Guest Agent POSIX-specific command implementations
   3  *
   4  * Copyright IBM Corp. 2011
   5  *
   6  * Authors:
   7  *  Michael Roth      <mdroth@linux.vnet.ibm.com>
   8  *  Michal Privoznik  <mprivozn@redhat.com>
   9  *
  10  * This work is licensed under the terms of the GNU GPL, version 2 or later.
  11  * See the COPYING file in the top-level directory.
  12  */
  13
  14 #include <glib.h>
  15 #include <sys/types.h>
  16 #include <sys/ioctl.h>
  17 #include <sys/wait.h>
  18 #include <unistd.h>
  19 #include <errno.h>
  20 #include <fcntl.h>
  21 #include <stdio.h>
  22 #include <string.h>
  23 #include <sys/stat.h>
  24 #include <inttypes.h>
  25 #include "qga/guest-agent-core.h"
  26 #include "qga-qmp-commands.h"
  27 #include "qapi/qmp/qerror.h"
  28 #include "qemu/queue.h"
  29 #include "qemu/host-utils.h"
  30
  31 #ifndef CONFIG_HAS_ENVIRON
  32 #ifdef __APPLE__
  33 #include <crt_externs.h>
  34 #define environ (*_NSGetEnviron())
  35 #else
  36 extern char **environ;
  37 #endif
  38 #endif
  39
  40 #if defined(__linux__)
  41 #include <mntent.h>
  42 #include <linux/fs.h>
  43 #include <ifaddrs.h>
  44 #include <arpa/inet.h>
  45 #include <sys/socket.h>
  46 #include <net/if.h>
  47
  48 #ifdef FIFREEZE
  49 #define CONFIG_FSFREEZE
  50 #endif
  51 #ifdef FITRIM
  52 #define CONFIG_FSTRIM
  53 #endif
  54 #endif
  55
  56 static void ga_wait_child(pid_t pid, int *status, Error **errp)
  57 {
  58     pid_t rpid;
  59
  60     *status = 0;
  61
  62     do {
  63         rpid = waitpid(pid, status, 0);
  64     } while (rpid == -1 && errno == EINTR);
  65
  66     if (rpid == -1) {
  67         error_setg_errno(errp, errno, "failed to wait for child (pid: %d)",
  68                          pid);
  69         return;
  70     }
  71
  72     g_assert(rpid == pid);
  73 }
  74
  75 void qmp_guest_shutdown(bool has_mode, const char *mode, Error **errp)
  76 {
  77     const char *shutdown_flag;
  78     Error *local_err = NULL;
  79     pid_t pid;
  80     int status;
  81
  82     slog("guest-shutdown called, mode: %s", mode);
  83     if (!has_mode || strcmp(mode, "powerdown") == 0) {
  84         shutdown_flag = "-P";
  85     } else if (strcmp(mode, "halt") == 0) {
  86         shutdown_flag = "-H";
  87     } else if (strcmp(mode, "reboot") == 0) {
  88         shutdown_flag = "-r";
  89     } else {
  90         error_setg(errp,
  91                    "mode is invalid (valid values are: halt|powerdown|reboot");
  92         return;
  93     }
  94
  95     pid = fork();
  96     if (pid == 0) {
  97         /* child, start the shutdown */
  98         setsid();
  99         reopen_fd_to_null(0);
 100         reopen_fd_to_null(1);
 101         reopen_fd_to_null(2);
 102
 103         execle("/sbin/shutdown", "shutdown", "-h", shutdown_flag, "+0",
 104                "hypervisor initiated shutdown", (char*)NULL, environ);
 105         _exit(EXIT_FAILURE);
 106     } else if (pid < 0) {
 107         error_setg_errno(errp, errno, "failed to create child process");
 108         return;
 109     }
 110
 111     ga_wait_child(pid, &status, &local_err);
 112     if (local_err) {
 113         error_propagate(errp, local_err);
 114         return;
 115     }
 116
 117     if (!WIFEXITED(status)) {
 118         error_setg(errp, "child process has terminated abnormally");
 119         return;
 120     }
 121
 122     if (WEXITSTATUS(status)) {
 123         error_setg(errp, "child process has failed to shutdown");
 124         return;
 125     }
 126
 127     /* succeeded */
 128 }
 129
 130 int64_t qmp_guest_get_time(Error **errp)
 131 {
 132    int ret;
 133    qemu_timeval tq;
 134    int64_t time_ns;
 135
 136    ret = qemu_gettimeofday(&tq);
 137    if (ret < 0) {
 138        error_setg_errno(errp, errno, "Failed to get time");
 139        return -1;
 140    }
 141
 142    time_ns = tq.tv_sec * 1000000000LL + tq.tv_usec * 1000;
 143    return time_ns;
 144 }
 145
 146 void qmp_guest_set_time(bool has_time, int64_t time_ns, Error **errp)
 147 {
 148     int ret;
 149     int status;
 150     pid_t pid;
 151     Error *local_err = NULL;
 152     struct timeval tv;
 153
 154     /* If user has passed a time, validate and set it. */
 155     if (has_time) {
 156         /* year-2038 will overflow in case time_t is 32bit */
 157         if (time_ns / 1000000000 != (time_t)(time_ns / 1000000000)) {
 158             error_setg(errp, "Time %" PRId64 " is too large", time_ns);
 159             return;
 160         }
 161
 162         tv.tv_sec = time_ns / 1000000000;
 163         tv.tv_usec = (time_ns % 1000000000) / 1000;
 164
 165         ret = settimeofday(&tv, NULL);
 166         if (ret < 0) {
 167             error_setg_errno(errp, errno, "Failed to set time to guest");
 168             return;
 169         }
 170     }
 171
 172     /* Now, if user has passed a time to set and the system time is set, we
 173      * just need to synchronize the hardware clock. However, if no time was
 174      * passed, user is requesting the opposite: set the system time from the
 175      * hardware clock (RTC). */
 176     pid = fork();
 177     if (pid == 0) {
 178         setsid();
 179         reopen_fd_to_null(0);
 180         reopen_fd_to_null(1);
 181         reopen_fd_to_null(2);
 182
 183         /* Use '/sbin/hwclock -w' to set RTC from the system time,
 184          * or '/sbin/hwclock -s' to set the system time from RTC. */
 185         execle("/sbin/hwclock", "hwclock", has_time ? "-w" : "-s",
 186                NULL, environ);
 187         _exit(EXIT_FAILURE);
 188     } else if (pid < 0) {
 189         error_setg_errno(errp, errno, "failed to create child process");
 190         return;
 191     }
 192
 193     ga_wait_child(pid, &status, &local_err);
 194     if (local_err) {
 195         error_propagate(errp, local_err);
 196         return;
 197     }
 198
 199     if (!WIFEXITED(status)) {
 200         error_setg(errp, "child process has terminated abnormally");
 201         return;
 202     }
 203
 204     if (WEXITSTATUS(status)) {
 205         error_setg(errp, "hwclock failed to set hardware clock to system time");
 206         return;
 207     }
 208 }
 209
 210 typedef struct GuestFileHandle {
 211     uint64_t id;
 212     FILE *fh;
 213     QTAILQ_ENTRY(GuestFileHandle) next;
 214 } GuestFileHandle;
 215
 216 static struct {
 217     QTAILQ_HEAD(, GuestFileHandle) filehandles;
 218 } guest_file_state;
 219
 220 static int64_t guest_file_handle_add(FILE *fh, Error **errp)
 221 {
 222     GuestFileHandle *gfh;
 223     int64_t handle;
 224
 225     handle = ga_get_fd_handle(ga_state, errp);
 226     if (handle < 0) {
 227         return -1;
 228     }
 229
 230     gfh = g_malloc0(sizeof(GuestFileHandle));
 231     gfh->id = handle;
 232     gfh->fh = fh;
 233     QTAILQ_INSERT_TAIL(&guest_file_state.filehandles, gfh, next);
 234
 235     return handle;
 236 }
 237
 238 static GuestFileHandle *guest_file_handle_find(int64_t id, Error **errp)
 239 {
 240     GuestFileHandle *gfh;
 241
 242     QTAILQ_FOREACH(gfh, &guest_file_state.filehandles, next)
 243     {
 244         if (gfh->id == id) {
 245             return gfh;
 246         }
 247     }
 248
 249     error_setg(errp, "handle '%" PRId64 "' has not been found", id);
 250     return NULL;
 251 }
 252
 253 typedef const char * const ccpc;
 254
 255 #ifndef O_BINARY
 256 #define O_BINARY 0
 257 #endif
 258
 259 /* http://pubs.opengroup.org/onlinepubs/9699919799/functions/fopen.html */
 260 static const struct {
 261     ccpc *forms;
 262     int oflag_base;
 263 } guest_file_open_modes[] = {
 264     { (ccpc[]){ "r",          NULL }, O_RDONLY                                 },
 265     { (ccpc[]){ "rb",         NULL }, O_RDONLY                      | O_BINARY },
 266     { (ccpc[]){ "w",          NULL }, O_WRONLY | O_CREAT | O_TRUNC             },
 267     { (ccpc[]){ "wb",         NULL }, O_WRONLY | O_CREAT | O_TRUNC  | O_BINARY },
 268     { (ccpc[]){ "a",          NULL }, O_WRONLY | O_CREAT | O_APPEND            },
 269     { (ccpc[]){ "ab",         NULL }, O_WRONLY | O_CREAT | O_APPEND | O_BINARY },
 270     { (ccpc[]){ "r+",         NULL }, O_RDWR                                   },
 271     { (ccpc[]){ "rb+", "r+b", NULL }, O_RDWR                        | O_BINARY },
 272     { (ccpc[]){ "w+",         NULL }, O_RDWR   | O_CREAT | O_TRUNC             },
 273     { (ccpc[]){ "wb+", "w+b", NULL }, O_RDWR   | O_CREAT | O_TRUNC  | O_BINARY },
 274     { (ccpc[]){ "a+",         NULL }, O_RDWR   | O_CREAT | O_APPEND            },
 275     { (ccpc[]){ "ab+", "a+b", NULL }, O_RDWR   | O_CREAT | O_APPEND | O_BINARY }
 276 };
 277
 278 static int
 279 find_open_flag(const char *mode_str, Error **errp)
 280 {
 281     unsigned mode;
 282
 283     for (mode = 0; mode < ARRAY_SIZE(guest_file_open_modes); ++mode) {
 284         ccpc *form;
 285
 286         form = guest_file_open_modes[mode].forms;
 287         while (*form != NULL && strcmp(*form, mode_str) != 0) {
 288             ++form;
 289         }
 290         if (*form != NULL) {
 291             break;
 292         }
 293     }
 294
 295     if (mode == ARRAY_SIZE(guest_file_open_modes)) {
 296         error_setg(errp, "invalid file open mode '%s'", mode_str);
 297         return -1;
 298     }
 299     return guest_file_open_modes[mode].oflag_base | O_NOCTTY | O_NONBLOCK;
 300 }
 301
 302 #define DEFAULT_NEW_FILE_MODE (S_IRUSR | S_IWUSR | \
 303                                S_IRGRP | S_IWGRP | \
 304                                S_IROTH | S_IWOTH)
 305
 306 static FILE *
 307 safe_open_or_create(const char *path, const char *mode, Error **errp)
 308 {
 309     Error *local_err = NULL;
 310     int oflag;
 311
 312     oflag = find_open_flag(mode, &local_err);
 313     if (local_err == NULL) {
 314         int fd;
 315
 316         /* If the caller wants / allows creation of a new file, we implement it
 317          * with a two step process: open() + (open() / fchmod()).
 318          *
 319          * First we insist on creating the file exclusively as a new file. If
 320          * that succeeds, we're free to set any file-mode bits on it. (The
 321          * motivation is that we want to set those file-mode bits independently
 322          * of the current umask.)
 323          *
 324          * If the exclusive creation fails because the file already exists
 325          * (EEXIST is not possible for any other reason), we just attempt to
 326          * open the file, but in this case we won't be allowed to change the
 327          * file-mode bits on the preexistent file.
 328          *
 329          * The pathname should never disappear between the two open()s in
 330          * practice. If it happens, then someone very likely tried to race us.
 331          * In this case just go ahead and report the ENOENT from the second
 332          * open() to the caller.
 333          *
 334          * If the caller wants to open a preexistent file, then the first
 335          * open() is decisive and its third argument is ignored, and the second
 336          * open() and the fchmod() are never called.
 337          */
 338         fd = open(path, oflag | ((oflag & O_CREAT) ? O_EXCL : 0), 0);
 339         if (fd == -1 && errno == EEXIST) {
 340             oflag &= ~(unsigned)O_CREAT;
 341             fd = open(path, oflag);
 342         }
 343
 344         if (fd == -1) {
 345             error_setg_errno(&local_err, errno, "failed to open file '%s' "
 346                              "(mode: '%s')", path, mode);
 347         } else {
 348             qemu_set_cloexec(fd);
 349
 350             if ((oflag & O_CREAT) && fchmod(fd, DEFAULT_NEW_FILE_MODE) == -1) {
 351                 error_setg_errno(&local_err, errno, "failed to set permission "
 352                                  "0%03o on new file '%s' (mode: '%s')",
 353                                  (unsigned)DEFAULT_NEW_FILE_MODE, path, mode);
 354             } else {
 355                 FILE *f;
 356
 357                 f = fdopen(fd, mode);
 358                 if (f == NULL) {
 359                     error_setg_errno(&local_err, errno, "failed to associate "
 360                                      "stdio stream with file descriptor %d, "
 361                                      "file '%s' (mode: '%s')", fd, path, mode);
 362                 } else {
 363                     return f;
 364                 }
 365             }
 366
 367             close(fd);
 368             if (oflag & O_CREAT) {
 369                 unlink(path);
 370             }
 371         }
 372     }
 373
 374     error_propagate(errp, local_err);
 375     return NULL;
 376 }
 377
 378 int64_t qmp_guest_file_open(const char *path, bool has_mode, const char *mode,
 379                             Error **errp)
 380 {
 381     FILE *fh;
 382     Error *local_err = NULL;
 383     int fd;
 384     int64_t ret = -1, handle;
 385
 386     if (!has_mode) {
 387         mode = "r";
 388     }
 389     slog("guest-file-open called, filepath: %s, mode: %s", path, mode);
 390     fh = safe_open_or_create(path, mode, &local_err);
 391     if (local_err != NULL) {
 392         error_propagate(errp, local_err);
 393         return -1;
 394     }
 395
 396     /* set fd non-blocking to avoid common use cases (like reading from a
 397      * named pipe) from hanging the agent
 398      */
 399     fd = fileno(fh);
 400     ret = fcntl(fd, F_GETFL);
 401     ret = fcntl(fd, F_SETFL, ret | O_NONBLOCK);
 402     if (ret == -1) {
 403         error_setg_errno(errp, errno, "failed to make file '%s' non-blocking",
 404                          path);
 405         fclose(fh);
 406         return -1;
 407     }
 408
 409     handle = guest_file_handle_add(fh, errp);
 410     if (handle < 0) {
 411         fclose(fh);
 412         return -1;
 413     }
 414
 415     slog("guest-file-open, handle: %" PRId64, handle);
 416     return handle;
 417 }
 418
 419 void qmp_guest_file_close(int64_t handle, Error **errp)
 420 {
 421     GuestFileHandle *gfh = guest_file_handle_find(handle, errp);
 422     int ret;
 423
 424     slog("guest-file-close called, handle: %" PRId64, handle);
 425     if (!gfh) {
 426         return;
 427     }
 428
 429     ret = fclose(gfh->fh);
 430     if (ret == EOF) {
 431         error_setg_errno(errp, errno, "failed to close handle");
 432         return;
 433     }
 434
 435     QTAILQ_REMOVE(&guest_file_state.filehandles, gfh, next);
 436     g_free(gfh);
 437 }
 438
 439 struct GuestFileRead *qmp_guest_file_read(int64_t handle, bool has_count,
 440                                           int64_t count, Error **errp)
 441 {
 442     GuestFileHandle *gfh = guest_file_handle_find(handle, errp);
 443     GuestFileRead *read_data = NULL;
 444     guchar *buf;
 445     FILE *fh;
 446     size_t read_count;
 447
 448     if (!gfh) {
 449         return NULL;
 450     }
 451
 452     if (!has_count) {
 453         count = QGA_READ_COUNT_DEFAULT;
 454     } else if (count < 0) {
 455         error_setg(errp, "value '%" PRId64 "' is invalid for argument count",
 456                    count);
 457         return NULL;
 458     }
 459
 460     fh = gfh->fh;
 461     buf = g_malloc0(count+1);
 462     read_count = fread(buf, 1, count, fh);
 463     if (ferror(fh)) {
 464         error_setg_errno(errp, errno, "failed to read file");
 465         slog("guest-file-read failed, handle: %" PRId64, handle);
 466     } else {
 467         buf[read_count] = 0;
 468         read_data = g_malloc0(sizeof(GuestFileRead));
 469         read_data->count = read_count;
 470         read_data->eof = feof(fh);
 471         if (read_count) {
 472             read_data->buf_b64 = g_base64_encode(buf, read_count);
 473         }
 474     }
 475     g_free(buf);
 476     clearerr(fh);
 477
 478     return read_data;
 479 }
 480
 481 GuestFileWrite *qmp_guest_file_write(int64_t handle, const char *buf_b64,
 482                                      bool has_count, int64_t count,
 483                                      Error **errp)
 484 {
 485     GuestFileWrite *write_data = NULL;
 486     guchar *buf;
 487     gsize buf_len;
 488     int write_count;
 489     GuestFileHandle *gfh = guest_file_handle_find(handle, errp);
 490     FILE *fh;
 491
 492     if (!gfh) {
 493         return NULL;
 494     }
 495
 496     fh = gfh->fh;
 497     buf = g_base64_decode(buf_b64, &buf_len);
 498
 499     if (!has_count) {
 500         count = buf_len;
 501     } else if (count < 0 || count > buf_len) {
 502         error_setg(errp, "value '%" PRId64 "' is invalid for argument count",
 503                    count);
 504         g_free(buf);
 505         return NULL;
 506     }
 507
 508     write_count = fwrite(buf, 1, count, fh);
 509     if (ferror(fh)) {
 510         error_setg_errno(errp, errno, "failed to write to file");
 511         slog("guest-file-write failed, handle: %" PRId64, handle);
 512     } else {
 513         write_data = g_malloc0(sizeof(GuestFileWrite));
 514         write_data->count = write_count;
 515         write_data->eof = feof(fh);
 516     }
 517     g_free(buf);
 518     clearerr(fh);
 519
 520     return write_data;
 521 }
 522
 523 struct GuestFileSeek *qmp_guest_file_seek(int64_t handle, int64_t offset,
 524                                           int64_t whence, Error **errp)
 525 {
 526     GuestFileHandle *gfh = guest_file_handle_find(handle, errp);
 527     GuestFileSeek *seek_data = NULL;
 528     FILE *fh;
 529     int ret;
 530
 531     if (!gfh) {
 532         return NULL;
 533     }
 534
 535     fh = gfh->fh;
 536     ret = fseek(fh, offset, whence);
 537     if (ret == -1) {
 538         error_setg_errno(errp, errno, "failed to seek file");
 539     } else {
 540         seek_data = g_new0(GuestFileSeek, 1);
 541         seek_data->position = ftell(fh);
 542         seek_data->eof = feof(fh);
 543     }
 544     clearerr(fh);
 545
 546     return seek_data;
 547 }
 548
 549 void qmp_guest_file_flush(int64_t handle, Error **errp)
 550 {
 551     GuestFileHandle *gfh = guest_file_handle_find(handle, errp);
 552     FILE *fh;
 553     int ret;
 554
 555     if (!gfh) {
 556         return;
 557     }
 558
 559     fh = gfh->fh;
 560     ret = fflush(fh);
 561     if (ret == EOF) {
 562         error_setg_errno(errp, errno, "failed to flush file");
 563     }
 564 }
 565
 566 static void guest_file_init(void)
 567 {
 568     QTAILQ_INIT(&guest_file_state.filehandles);
 569 }
 570
 571 /* linux-specific implementations. avoid this if at all possible. */
 572 #if defined(__linux__)
 573
 574 #if defined(CONFIG_FSFREEZE) || defined(CONFIG_FSTRIM)
 575 typedef struct FsMount {
 576     char *dirname;
 577     char *devtype;
 578     QTAILQ_ENTRY(FsMount) next;
 579 } FsMount;
 580
 581 typedef QTAILQ_HEAD(FsMountList, FsMount) FsMountList;
 582
 583 static void free_fs_mount_list(FsMountList *mounts)
 584 {
 585      FsMount *mount, *temp;
 586
 587      if (!mounts) {
 588          return;
 589      }
 590
 591      QTAILQ_FOREACH_SAFE(mount, mounts, next, temp) {
 592          QTAILQ_REMOVE(mounts, mount, next);
 593          g_free(mount->dirname);
 594          g_free(mount->devtype);
 595          g_free(mount);
 596      }
 597 }
 598
 599 /*
 600  * Walk the mount table and build a list of local file systems
 601  */
 602 static void build_fs_mount_list(FsMountList *mounts, Error **errp)
 603 {
 604     struct mntent *ment;
 605     FsMount *mount;
 606     char const *mtab = "/proc/self/mounts";
 607     FILE *fp;
 608
 609     fp = setmntent(mtab, "r");
 610     if (!fp) {
 611         error_setg(errp, "failed to open mtab file: '%s'", mtab);
 612         return;
 613     }
 614
 615     while ((ment = getmntent(fp))) {
 616         /*
 617          * An entry which device name doesn't start with a '/' is
 618          * either a dummy file system or a network file system.
 619          * Add special handling for smbfs and cifs as is done by
 620          * coreutils as well.
 621          */
 622         if ((ment->mnt_fsname[0] != '/') ||
 623             (strcmp(ment->mnt_type, "smbfs") == 0) ||
 624             (strcmp(ment->mnt_type, "cifs") == 0)) {
 625             continue;
 626         }
 627
 628         mount = g_malloc0(sizeof(FsMount));
 629         mount->dirname = g_strdup(ment->mnt_dir);
 630         mount->devtype = g_strdup(ment->mnt_type);
 631
 632         QTAILQ_INSERT_TAIL(mounts, mount, next);
 633     }
 634
 635     endmntent(fp);
 636 }
 637 #endif
 638
 639 #if defined(CONFIG_FSFREEZE)
 640
 641 typedef enum {
 642     FSFREEZE_HOOK_THAW = 0,
 643     FSFREEZE_HOOK_FREEZE,
 644 } FsfreezeHookArg;
 645
 646 static const char *fsfreeze_hook_arg_string[] = {
 647     "thaw",
 648     "freeze",
 649 };
 650
 651 static void execute_fsfreeze_hook(FsfreezeHookArg arg, Error **errp)
 652 {
 653     int status;
 654     pid_t pid;
 655     const char *hook;
 656     const char *arg_str = fsfreeze_hook_arg_string[arg];
 657     Error *local_err = NULL;
 658
 659     hook = ga_fsfreeze_hook(ga_state);
 660     if (!hook) {
 661         return;
 662     }
 663     if (access(hook, X_OK) != 0) {
 664         error_setg_errno(errp, errno, "can't access fsfreeze hook '%s'", hook);
 665         return;
 666     }
 667
 668     slog("executing fsfreeze hook with arg '%s'", arg_str);
 669     pid = fork();
 670     if (pid == 0) {
 671         setsid();
 672         reopen_fd_to_null(0);
 673         reopen_fd_to_null(1);
 674         reopen_fd_to_null(2);
 675
 676         execle(hook, hook, arg_str, NULL, environ);
 677         _exit(EXIT_FAILURE);
 678     } else if (pid < 0) {
 679         error_setg_errno(errp, errno, "failed to create child process");
 680         return;
 681     }
 682
 683     ga_wait_child(pid, &status, &local_err);
 684     if (local_err) {
 685         error_propagate(errp, local_err);
 686         return;
 687     }
 688
 689     if (!WIFEXITED(status)) {
 690         error_setg(errp, "fsfreeze hook has terminated abnormally");
 691         return;
 692     }
 693
 694     status = WEXITSTATUS(status);
 695     if (status) {
 696         error_setg(errp, "fsfreeze hook has failed with status %d", status);
 697         return;
 698     }
 699 }
 700
 701 /*
 702  * Return status of freeze/thaw
 703  */
 704 GuestFsfreezeStatus qmp_guest_fsfreeze_status(Error **errp)
 705 {
 706     if (ga_is_frozen(ga_state)) {
 707         return GUEST_FSFREEZE_STATUS_FROZEN;
 708     }
 709
 710     return GUEST_FSFREEZE_STATUS_THAWED;
 711 }
 712
 713 int64_t qmp_guest_fsfreeze_freeze(Error **errp)
 714 {
 715     return qmp_guest_fsfreeze_freeze_list(false, NULL, errp);
 716 }
 717
 718 /*
 719  * Walk list of mounted file systems in the guest, and freeze the ones which
 720  * are real local file systems.
 721  */
 722 int64_t qmp_guest_fsfreeze_freeze_list(bool has_mountpoints,
 723                                        strList *mountpoints,
 724                                        Error **errp)
 725 {
 726     int ret = 0, i = 0;
 727     strList *list;
 728     FsMountList mounts;
 729     struct FsMount *mount;
 730     Error *local_err = NULL;
 731     int fd;
 732
 733     slog("guest-fsfreeze called");
 734
 735     execute_fsfreeze_hook(FSFREEZE_HOOK_FREEZE, &local_err);
 736     if (local_err) {
 737         error_propagate(errp, local_err);
 738         return -1;
 739     }
 740
 741     QTAILQ_INIT(&mounts);
 742     build_fs_mount_list(&mounts, &local_err);
 743     if (local_err) {
 744         error_propagate(errp, local_err);
 745         return -1;
 746     }
 747
 748     /* cannot risk guest agent blocking itself on a write in this state */
 749     ga_set_frozen(ga_state);
 750
 751     QTAILQ_FOREACH_REVERSE(mount, &mounts, FsMountList, next) {
 752         /* To issue fsfreeze in the reverse order of mounts, check if the
 753          * mount is listed in the list here */
 754         if (has_mountpoints) {
 755             for (list = mountpoints; list; list = list->next) {
 756                 if (strcmp(list->value, mount->dirname) == 0) {
 757                     break;
 758                 }
 759             }
 760             if (!list) {
 761                 continue;
 762             }
 763         }
 764
 765         fd = qemu_open(mount->dirname, O_RDONLY);
 766         if (fd == -1) {
 767             error_setg_errno(errp, errno, "failed to open %s", mount->dirname);
 768             goto error;
 769         }
 770
 771         /* we try to cull filesytems we know won't work in advance, but other
 772          * filesytems may not implement fsfreeze for less obvious reasons.
 773          * these will report EOPNOTSUPP. we simply ignore these when tallying
 774          * the number of frozen filesystems.
 775          *
 776          * any other error means a failure to freeze a filesystem we
 777          * expect to be freezable, so return an error in those cases
 778          * and return system to thawed state.
 779          */
 780         ret = ioctl(fd, FIFREEZE);
 781         if (ret == -1) {
 782             if (errno != EOPNOTSUPP) {
 783                 error_setg_errno(errp, errno, "failed to freeze %s",
 784                                  mount->dirname);
 785                 close(fd);
 786                 goto error;
 787             }
 788         } else {
 789             i++;
 790         }
 791         close(fd);
 792     }
 793
 794     free_fs_mount_list(&mounts);
 795     return i;
 796
 797 error:
 798     free_fs_mount_list(&mounts);
 799     qmp_guest_fsfreeze_thaw(NULL);
 800     return 0;
 801 }
 802
 803 /*
 804  * Walk list of frozen file systems in the guest, and thaw them.
 805  */
 806 int64_t qmp_guest_fsfreeze_thaw(Error **errp)
 807 {
 808     int ret;
 809     FsMountList mounts;
 810     FsMount *mount;
 811     int fd, i = 0, logged;
 812     Error *local_err = NULL;
 813
 814     QTAILQ_INIT(&mounts);
 815     build_fs_mount_list(&mounts, &local_err);
 816     if (local_err) {
 817         error_propagate(errp, local_err);
 818         return 0;
 819     }
 820
 821     QTAILQ_FOREACH(mount, &mounts, next) {
 822         logged = false;
 823         fd = qemu_open(mount->dirname, O_RDONLY);
 824         if (fd == -1) {
 825             continue;
 826         }
 827         /* we have no way of knowing whether a filesystem was actually unfrozen
 828          * as a result of a successful call to FITHAW, only that if an error
 829          * was returned the filesystem was *not* unfrozen by that particular
 830          * call.
 831          *
 832          * since multiple preceding FIFREEZEs require multiple calls to FITHAW
 833          * to unfreeze, continuing issuing FITHAW until an error is returned,
 834          * in which case either the filesystem is in an unfreezable state, or,
 835          * more likely, it was thawed previously (and remains so afterward).
 836          *
 837          * also, since the most recent successful call is the one that did
 838          * the actual unfreeze, we can use this to provide an accurate count
 839          * of the number of filesystems unfrozen by guest-fsfreeze-thaw, which
 840          * may * be useful for determining whether a filesystem was unfrozen
 841          * during the freeze/thaw phase by a process other than qemu-ga.
 842          */
 843         do {
 844             ret = ioctl(fd, FITHAW);
 845             if (ret == 0 && !logged) {
 846                 i++;
 847                 logged = true;
 848             }
 849         } while (ret == 0);
 850         close(fd);
 851     }
 852
 853     ga_unset_frozen(ga_state);
 854     free_fs_mount_list(&mounts);
 855
 856     execute_fsfreeze_hook(FSFREEZE_HOOK_THAW, errp);
 857
 858     return i;
 859 }
 860
 861 static void guest_fsfreeze_cleanup(void)
 862 {
 863     Error *err = NULL;
 864
 865     if (ga_is_frozen(ga_state) == GUEST_FSFREEZE_STATUS_FROZEN) {
 866         qmp_guest_fsfreeze_thaw(&err);
 867         if (err) {
 868             slog("failed to clean up frozen filesystems: %s",
 869                  error_get_pretty(err));
 870             error_free(err);
 871         }
 872     }
 873 }
 874 #endif /* CONFIG_FSFREEZE */
 875
 876 #if defined(CONFIG_FSTRIM)
 877 /*
 878  * Walk list of mounted file systems in the guest, and trim them.
 879  */
 880 void qmp_guest_fstrim(bool has_minimum, int64_t minimum, Error **errp)
 881 {
 882     int ret = 0;
 883     FsMountList mounts;
 884     struct FsMount *mount;
 885     int fd;
 886     Error *local_err = NULL;
 887     struct fstrim_range r = {
 888         .start = 0,
 889         .len = -1,
 890         .minlen = has_minimum ? minimum : 0,
 891     };
 892
 893     slog("guest-fstrim called");
 894
 895     QTAILQ_INIT(&mounts);
 896     build_fs_mount_list(&mounts, &local_err);
 897     if (local_err) {
 898         error_propagate(errp, local_err);
 899         return;
 900     }
 901
 902     QTAILQ_FOREACH(mount, &mounts, next) {
 903         fd = qemu_open(mount->dirname, O_RDONLY);
 904         if (fd == -1) {
 905             error_setg_errno(errp, errno, "failed to open %s", mount->dirname);
 906             goto error;
 907         }
 908
 909         /* We try to cull filesytems we know won't work in advance, but other
 910          * filesytems may not implement fstrim for less obvious reasons.  These
 911          * will report EOPNOTSUPP; we simply ignore these errors.  Any other
 912          * error means an unexpected error, so return it in those cases.  In
 913          * some other cases ENOTTY will be reported (e.g. CD-ROMs).
 914          */
 915         ret = ioctl(fd, FITRIM, &r);
 916         if (ret == -1) {
 917             if (errno != ENOTTY && errno != EOPNOTSUPP) {
 918                 error_setg_errno(errp, errno, "failed to trim %s",
 919                                  mount->dirname);
 920                 close(fd);
 921                 goto error;
 922             }
 923         }
 924         close(fd);
 925     }
 926
 927 error:
 928     free_fs_mount_list(&mounts);
 929 }
 930 #endif /* CONFIG_FSTRIM */
 931
 932
 933 #define LINUX_SYS_STATE_FILE "/sys/power/state"
 934 #define SUSPEND_SUPPORTED 0
 935 #define SUSPEND_NOT_SUPPORTED 1
 936
 937 static void bios_supports_mode(const char *pmutils_bin, const char *pmutils_arg,
 938                                const char *sysfile_str, Error **errp)
 939 {
 940     Error *local_err = NULL;
 941     char *pmutils_path;
 942     pid_t pid;
 943     int status;
 944
 945     pmutils_path = g_find_program_in_path(pmutils_bin);
 946
 947     pid = fork();
 948     if (!pid) {
 949         char buf[32]; /* hopefully big enough */
 950         ssize_t ret;
 951         int fd;
 952
 953         setsid();
 954         reopen_fd_to_null(0);
 955         reopen_fd_to_null(1);
 956         reopen_fd_to_null(2);
 957
 958         if (pmutils_path) {
 959             execle(pmutils_path, pmutils_bin, pmutils_arg, NULL, environ);
 960         }
 961
 962         /*
 963          * If we get here either pm-utils is not installed or execle() has
 964          * failed. Let's try the manual method if the caller wants it.
 965          */
 966
 967         if (!sysfile_str) {
 968             _exit(SUSPEND_NOT_SUPPORTED);
 969         }
 970
 971         fd = open(LINUX_SYS_STATE_FILE, O_RDONLY);
 972         if (fd < 0) {
 973             _exit(SUSPEND_NOT_SUPPORTED);
 974         }
 975
 976         ret = read(fd, buf, sizeof(buf)-1);
 977         if (ret <= 0) {
 978             _exit(SUSPEND_NOT_SUPPORTED);
 979         }
 980         buf[ret] = '\0';
 981
 982         if (strstr(buf, sysfile_str)) {
 983             _exit(SUSPEND_SUPPORTED);
 984         }
 985
 986         _exit(SUSPEND_NOT_SUPPORTED);
 987     } else if (pid < 0) {
 988         error_setg_errno(errp, errno, "failed to create child process");
 989         goto out;
 990     }
 991
 992     ga_wait_child(pid, &status, &local_err);
 993     if (local_err) {
 994         error_propagate(errp, local_err);
 995         goto out;
 996     }
 997
 998     if (!WIFEXITED(status)) {
 999         error_setg(errp, "child process has terminated abnormally");
1000         goto out;
1001     }
1002
1003     switch (WEXITSTATUS(status)) {
1004     case SUSPEND_SUPPORTED:
1005         goto out;
1006     case SUSPEND_NOT_SUPPORTED:
1007         error_setg(errp,
1008                    "the requested suspend mode is not supported by the guest");
1009         goto out;
1010     default:
1011         error_setg(errp,
1012                    "the helper program '%s' returned an unexpected exit status"
1013                    " code (%d)", pmutils_path, WEXITSTATUS(status));
1014         goto out;
1015     }
1016
1017 out:
1018     g_free(pmutils_path);
1019 }
1020
1021 static void guest_suspend(const char *pmutils_bin, const char *sysfile_str,
1022                           Error **errp)
1023 {
1024     Error *local_err = NULL;
1025     char *pmutils_path;
1026     pid_t pid;
1027     int status;
1028
1029     pmutils_path = g_find_program_in_path(pmutils_bin);
1030
1031     pid = fork();
1032     if (pid == 0) {
1033         /* child */
1034         int fd;
1035
1036         setsid();
1037         reopen_fd_to_null(0);
1038         reopen_fd_to_null(1);
1039         reopen_fd_to_null(2);
1040
1041         if (pmutils_path) {
1042             execle(pmutils_path, pmutils_bin, NULL, environ);
1043         }
1044
1045         /*
1046          * If we get here either pm-utils is not installed or execle() has
1047          * failed. Let's try the manual method if the caller wants it.
1048          */
1049
1050         if (!sysfile_str) {
1051             _exit(EXIT_FAILURE);
1052         }
1053
1054         fd = open(LINUX_SYS_STATE_FILE, O_WRONLY);
1055         if (fd < 0) {
1056             _exit(EXIT_FAILURE);
1057         }
1058
1059         if (write(fd, sysfile_str, strlen(sysfile_str)) < 0) {
1060             _exit(EXIT_FAILURE);
1061         }
1062
1063         _exit(EXIT_SUCCESS);
1064     } else if (pid < 0) {
1065         error_setg_errno(errp, errno, "failed to create child process");
1066         goto out;
1067     }
1068
1069     ga_wait_child(pid, &status, &local_err);
1070     if (local_err) {
1071         error_propagate(errp, local_err);
1072         goto out;
1073     }
1074
1075     if (!WIFEXITED(status)) {
1076         error_setg(errp, "child process has terminated abnormally");
1077         goto out;
1078     }
1079
1080     if (WEXITSTATUS(status)) {
1081         error_setg(errp, "child process has failed to suspend");
1082         goto out;
1083     }
1084
1085 out:
1086     g_free(pmutils_path);
1087 }
1088
1089 void qmp_guest_suspend_disk(Error **errp)
1090 {
1091     Error *local_err = NULL;
1092
1093     bios_supports_mode("pm-is-supported", "--hibernate", "disk", &local_err);
1094     if (local_err) {
1095         error_propagate(errp, local_err);
1096         return;
1097     }
1098
1099     guest_suspend("pm-hibernate", "disk", errp);
1100 }
1101
1102 void qmp_guest_suspend_ram(Error **errp)
1103 {
1104     Error *local_err = NULL;
1105
1106     bios_supports_mode("pm-is-supported", "--suspend", "mem", &local_err);
1107     if (local_err) {
1108         error_propagate(errp, local_err);
1109         return;
1110     }
1111
1112     guest_suspend("pm-suspend", "mem", errp);
1113 }
1114
1115 void qmp_guest_suspend_hybrid(Error **errp)
1116 {
1117     Error *local_err = NULL;
1118
1119     bios_supports_mode("pm-is-supported", "--suspend-hybrid", NULL,
1120                        &local_err);
1121     if (local_err) {
1122         error_propagate(errp, local_err);
1123         return;
1124     }
1125
1126     guest_suspend("pm-suspend-hybrid", NULL, errp);
1127 }
1128
1129 static GuestNetworkInterfaceList *
1130 guest_find_interface(GuestNetworkInterfaceList *head,
1131                      const char *name)
1132 {
1133     for (; head; head = head->next) {
1134         if (strcmp(head->value->name, name) == 0) {
1135             break;
1136         }
1137     }
1138
1139     return head;
1140 }
1141
1142 /*
1143  * Build information about guest interfaces
1144  */
1145 GuestNetworkInterfaceList *qmp_guest_network_get_interfaces(Error **errp)
1146 {
1147     GuestNetworkInterfaceList *head = NULL, *cur_item = NULL;
1148     struct ifaddrs *ifap, *ifa;
1149
1150     if (getifaddrs(&ifap) < 0) {
1151         error_setg_errno(errp, errno, "getifaddrs failed");
1152         goto error;
1153     }
1154
1155     for (ifa = ifap; ifa; ifa = ifa->ifa_next) {
1156         GuestNetworkInterfaceList *info;
1157         GuestIpAddressList **address_list = NULL, *address_item = NULL;
1158         char addr4[INET_ADDRSTRLEN];
1159         char addr6[INET6_ADDRSTRLEN];
1160         int sock;
1161         struct ifreq ifr;
1162         unsigned char *mac_addr;
1163         void *p;
1164
1165         g_debug("Processing %s interface", ifa->ifa_name);
1166
1167         info = guest_find_interface(head, ifa->ifa_name);
1168
1169         if (!info) {
1170             info = g_malloc0(sizeof(*info));
1171             info->value = g_malloc0(sizeof(*info->value));
1172             info->value->name = g_strdup(ifa->ifa_name);
1173
1174             if (!cur_item) {
1175                 head = cur_item = info;
1176             } else {
1177                 cur_item->next = info;
1178                 cur_item = info;
1179             }
1180         }
1181
1182         if (!info->value->has_hardware_address &&
1183             ifa->ifa_flags & SIOCGIFHWADDR) {
1184             /* we haven't obtained HW address yet */
1185             sock = socket(PF_INET, SOCK_STREAM, 0);
1186             if (sock == -1) {
1187                 error_setg_errno(errp, errno, "failed to create socket");
1188                 goto error;
1189             }
1190
1191             memset(&ifr, 0, sizeof(ifr));
1192             pstrcpy(ifr.ifr_name, IF_NAMESIZE, info->value->name);
1193             if (ioctl(sock, SIOCGIFHWADDR, &ifr) == -1) {
1194                 error_setg_errno(errp, errno,
1195                                  "failed to get MAC address of %s",
1196                                  ifa->ifa_name);
1197                 close(sock);
1198                 goto error;
1199             }
1200
1201             close(sock);
1202             mac_addr = (unsigned char *) &ifr.ifr_hwaddr.sa_data;
1203
1204             info->value->hardware_address =
1205                 g_strdup_printf("%02x:%02x:%02x:%02x:%02x:%02x",
1206                                 (int) mac_addr[0], (int) mac_addr[1],
1207                                 (int) mac_addr[2], (int) mac_addr[3],
1208                                 (int) mac_addr[4], (int) mac_addr[5]);
1209
1210             info->value->has_hardware_address = true;
1211         }
1212
1213         if (ifa->ifa_addr &&
1214             ifa->ifa_addr->sa_family == AF_INET) {
1215             /* interface with IPv4 address */
1216             p = &((struct sockaddr_in *)ifa->ifa_addr)->sin_addr;
1217             if (!inet_ntop(AF_INET, p, addr4, sizeof(addr4))) {
1218                 error_setg_errno(errp, errno, "inet_ntop failed");
1219                 goto error;
1220             }
1221
1222             address_item = g_malloc0(sizeof(*address_item));
1223             address_item->value = g_malloc0(sizeof(*address_item->value));
1224             address_item->value->ip_address = g_strdup(addr4);
1225             address_item->value->ip_address_type = GUEST_IP_ADDRESS_TYPE_IPV4;
1226
1227             if (ifa->ifa_netmask) {
1228                 /* Count the number of set bits in netmask.
1229                  * This is safe as '1' and '0' cannot be shuffled in netmask. */
1230                 p = &((struct sockaddr_in *)ifa->ifa_netmask)->sin_addr;
1231                 address_item->value->prefix = ctpop32(((uint32_t *) p)[0]);
1232             }
1233         } else if (ifa->ifa_addr &&
1234                    ifa->ifa_addr->sa_family == AF_INET6) {
1235             /* interface with IPv6 address */
1236             p = &((struct sockaddr_in6 *)ifa->ifa_addr)->sin6_addr;
1237             if (!inet_ntop(AF_INET6, p, addr6, sizeof(addr6))) {
1238                 error_setg_errno(errp, errno, "inet_ntop failed");
1239                 goto error;
1240             }
1241
1242             address_item = g_malloc0(sizeof(*address_item));
1243             address_item->value = g_malloc0(sizeof(*address_item->value));
1244             address_item->value->ip_address = g_strdup(addr6);
1245             address_item->value->ip_address_type = GUEST_IP_ADDRESS_TYPE_IPV6;
1246
1247             if (ifa->ifa_netmask) {
1248                 /* Count the number of set bits in netmask.
1249                  * This is safe as '1' and '0' cannot be shuffled in netmask. */
1250                 p = &((struct sockaddr_in6 *)ifa->ifa_netmask)->sin6_addr;
1251                 address_item->value->prefix =
1252                     ctpop32(((uint32_t *) p)[0]) +
1253                     ctpop32(((uint32_t *) p)[1]) +
1254                     ctpop32(((uint32_t *) p)[2]) +
1255                     ctpop32(((uint32_t *) p)[3]);
1256             }
1257         }
1258
1259         if (!address_item) {
1260             continue;
1261         }
1262
1263         address_list = &info->value->ip_addresses;
1264
1265         while (*address_list && (*address_list)->next) {
1266             address_list = &(*address_list)->next;
1267         }
1268
1269         if (!*address_list) {
1270             *address_list = address_item;
1271         } else {
1272             (*address_list)->next = address_item;
1273         }
1274
1275         info->value->has_ip_addresses = true;
1276
1277
1278     }
1279
1280     freeifaddrs(ifap);
1281     return head;
1282
1283 error:
1284     freeifaddrs(ifap);
1285     qapi_free_GuestNetworkInterfaceList(head);
1286     return NULL;
1287 }
1288
1289 #define SYSCONF_EXACT(name, errp) sysconf_exact((name), #name, (errp))
1290
1291 static long sysconf_exact(int name, const char *name_str, Error **errp)
1292 {
1293     long ret;
1294
1295     errno = 0;
1296     ret = sysconf(name);
1297     if (ret == -1) {
1298         if (errno == 0) {
1299             error_setg(errp, "sysconf(%s): value indefinite", name_str);
1300         } else {
1301             error_setg_errno(errp, errno, "sysconf(%s)", name_str);
1302         }
1303     }
1304     return ret;
1305 }
1306
1307 /* Transfer online/offline status between @vcpu and the guest system.
1308  *
1309  * On input either @errp or *@errp must be NULL.
1310  *
1311  * In system-to-@vcpu direction, the following @vcpu fields are accessed:
1312  * - R: vcpu->logical_id
1313  * - W: vcpu->online
1314  * - W: vcpu->can_offline
1315  *
1316  * In @vcpu-to-system direction, the following @vcpu fields are accessed:
1317  * - R: vcpu->logical_id
1318  * - R: vcpu->online
1319  *
1320  * Written members remain unmodified on error.
1321  */
1322 static void transfer_vcpu(GuestLogicalProcessor *vcpu, bool sys2vcpu,
1323                           Error **errp)
1324 {
1325     char *dirpath;
1326     int dirfd;
1327
1328     dirpath = g_strdup_printf("/sys/devices/system/cpu/cpu%" PRId64 "/",
1329                               vcpu->logical_id);
1330     dirfd = open(dirpath, O_RDONLY | O_DIRECTORY);
1331     if (dirfd == -1) {
1332         error_setg_errno(errp, errno, "open(\"%s\")", dirpath);
1333     } else {
1334         static const char fn[] = "online";
1335         int fd;
1336         int res;
1337
1338         fd = openat(dirfd, fn, sys2vcpu ? O_RDONLY : O_RDWR);
1339         if (fd == -1) {
1340             if (errno != ENOENT) {
1341                 error_setg_errno(errp, errno, "open(\"%s/%s\")", dirpath, fn);
1342             } else if (sys2vcpu) {
1343                 vcpu->online = true;
1344                 vcpu->can_offline = false;
1345             } else if (!vcpu->online) {
1346                 error_setg(errp, "logical processor #%" PRId64 " can't be "
1347                            "offlined", vcpu->logical_id);
1348             } /* otherwise pretend successful re-onlining */
1349         } else {
1350             unsigned char status;
1351
1352             res = pread(fd, &status, 1, 0);
1353             if (res == -1) {
1354                 error_setg_errno(errp, errno, "pread(\"%s/%s\")", dirpath, fn);
1355             } else if (res == 0) {
1356                 error_setg(errp, "pread(\"%s/%s\"): unexpected EOF", dirpath,
1357                            fn);
1358             } else if (sys2vcpu) {
1359                 vcpu->online = (status != '0');
1360                 vcpu->can_offline = true;
1361             } else if (vcpu->online != (status != '0')) {
1362                 status = '0' + vcpu->online;
1363                 if (pwrite(fd, &status, 1, 0) == -1) {
1364                     error_setg_errno(errp, errno, "pwrite(\"%s/%s\")", dirpath,
1365                                      fn);
1366                 }
1367             } /* otherwise pretend successful re-(on|off)-lining */
1368
1369             res = close(fd);
1370             g_assert(res == 0);
1371         }
1372
1373         res = close(dirfd);
1374         g_assert(res == 0);
1375     }
1376
1377     g_free(dirpath);
1378 }
1379
1380 GuestLogicalProcessorList *qmp_guest_get_vcpus(Error **errp)
1381 {
1382     int64_t current;
1383     GuestLogicalProcessorList *head, **link;
1384     long sc_max;
1385     Error *local_err = NULL;
1386
1387     current = 0;
1388     head = NULL;
1389     link = &head;
1390     sc_max = SYSCONF_EXACT(_SC_NPROCESSORS_CONF, &local_err);
1391
1392     while (local_err == NULL && current < sc_max) {
1393         GuestLogicalProcessor *vcpu;
1394         GuestLogicalProcessorList *entry;
1395
1396         vcpu = g_malloc0(sizeof *vcpu);
1397         vcpu->logical_id = current++;
1398         vcpu->has_can_offline = true; /* lolspeak ftw */
1399         transfer_vcpu(vcpu, true, &local_err);
1400
1401         entry = g_malloc0(sizeof *entry);
1402         entry->value = vcpu;
1403
1404         *link = entry;
1405         link = &entry->next;
1406     }
1407
1408     if (local_err == NULL) {
1409         /* there's no guest with zero VCPUs */
1410         g_assert(head != NULL);
1411         return head;
1412     }
1413
1414     qapi_free_GuestLogicalProcessorList(head);
1415     error_propagate(errp, local_err);
1416     return NULL;
1417 }
1418
1419 int64_t qmp_guest_set_vcpus(GuestLogicalProcessorList *vcpus, Error **errp)
1420 {
1421     int64_t processed;
1422     Error *local_err = NULL;
1423
1424     processed = 0;
1425     while (vcpus != NULL) {
1426         transfer_vcpu(vcpus->value, false, &local_err);
1427         if (local_err != NULL) {
1428             break;
1429         }
1430         ++processed;
1431         vcpus = vcpus->next;
1432     }
1433
1434     if (local_err != NULL) {
1435         if (processed == 0) {
1436             error_propagate(errp, local_err);
1437         } else {
1438             error_free(local_err);
1439         }
1440     }
1441
1442     return processed;
1443 }
1444
1445 #else /* defined(__linux__) */
1446
1447 void qmp_guest_suspend_disk(Error **errp)
1448 {
1449     error_set(errp, QERR_UNSUPPORTED);
1450 }
1451
1452 void qmp_guest_suspend_ram(Error **errp)
1453 {
1454     error_set(errp, QERR_UNSUPPORTED);
1455 }
1456
1457 void qmp_guest_suspend_hybrid(Error **errp)
1458 {
1459     error_set(errp, QERR_UNSUPPORTED);
1460 }
1461
1462 GuestNetworkInterfaceList *qmp_guest_network_get_interfaces(Error **errp)
1463 {
1464     error_set(errp, QERR_UNSUPPORTED);
1465     return NULL;
1466 }
1467
1468 GuestLogicalProcessorList *qmp_guest_get_vcpus(Error **errp)
1469 {
1470     error_set(errp, QERR_UNSUPPORTED);
1471     return NULL;
1472 }
1473
1474 int64_t qmp_guest_set_vcpus(GuestLogicalProcessorList *vcpus, Error **errp)
1475 {
1476     error_set(errp, QERR_UNSUPPORTED);
1477     return -1;
1478 }
1479
1480 #endif
1481
1482 #if !defined(CONFIG_FSFREEZE)
1483
1484 GuestFsfreezeStatus qmp_guest_fsfreeze_status(Error **errp)
1485 {
1486     error_set(errp, QERR_UNSUPPORTED);
1487
1488     return 0;
1489 }
1490
1491 int64_t qmp_guest_fsfreeze_freeze(Error **errp)
1492 {
1493     error_set(errp, QERR_UNSUPPORTED);
1494
1495     return 0;
1496 }
1497
1498 int64_t qmp_guest_fsfreeze_freeze_list(bool has_mountpoints,
1499                                        strList *mountpoints,
1500                                        Error **errp)
1501 {
1502     error_set(errp, QERR_UNSUPPORTED);
1503
1504     return 0;
1505 }
1506
1507 int64_t qmp_guest_fsfreeze_thaw(Error **errp)
1508 {
1509     error_set(errp, QERR_UNSUPPORTED);
1510
1511     return 0;
1512 }
1513 #endif /* CONFIG_FSFREEZE */
1514
1515 #if !defined(CONFIG_FSTRIM)
1516 void qmp_guest_fstrim(bool has_minimum, int64_t minimum, Error **errp)
1517 {
1518     error_set(errp, QERR_UNSUPPORTED);
1519 }
1520 #endif
1521
1522 /* register init/cleanup routines for stateful command groups */
1523 void ga_command_state_init(GAState *s, GACommandState *cs)
1524 {
1525 #if defined(CONFIG_FSFREEZE)
1526     ga_command_state_add(cs, NULL, guest_fsfreeze_cleanup);
1527 #endif
1528     ga_command_state_add(cs, guest_file_init, NULL);
1529 }