hw/usb/dev-mtp.c

   1 /*
   2  * Media Transfer Protocol implementation, backed by host filesystem.
   3  *
   4  * Copyright Red Hat, Inc 2014
   5  *
   6  * Author:
   7  *   Gerd Hoffmann <[email protected]>
   8  *
   9  * This code is licensed under the GPL v2 or later.
  10  */
  11
  12 #include "qemu/osdep.h"
  13 #include "qapi/error.h"
  14 #include <wchar.h>
  15 #include <dirent.h>
  16
  17 #include <sys/statvfs.h>
  18 #ifdef CONFIG_INOTIFY1
  19 #include <sys/inotify.h>
  20 #include "qemu/main-loop.h"
  21 #endif
  22
  23 #include "qemu-common.h"
  24 #include "qemu/iov.h"
  25 #include "trace.h"
  26 #include "hw/usb.h"
  27 #include "desc.h"
  28 #include "qemu/units.h"
  29
  30 /* ----------------------------------------------------------------------- */
  31
  32 enum mtp_container_type {
  33     TYPE_COMMAND  = 1,
  34     TYPE_DATA     = 2,
  35     TYPE_RESPONSE = 3,
  36     TYPE_EVENT    = 4,
  37 };
  38
  39 /* MTP write stage, for internal use only */
  40 enum mtp_write_status {
  41     WRITE_START    = 1,
  42     WRITE_CONTINUE = 2,
  43     WRITE_END      = 3,
  44 };
  45
  46 enum mtp_code {
  47     /* command codes */
  48     CMD_GET_DEVICE_INFO            = 0x1001,
  49     CMD_OPEN_SESSION               = 0x1002,
  50     CMD_CLOSE_SESSION              = 0x1003,
  51     CMD_GET_STORAGE_IDS            = 0x1004,
  52     CMD_GET_STORAGE_INFO           = 0x1005,
  53     CMD_GET_NUM_OBJECTS            = 0x1006,
  54     CMD_GET_OBJECT_HANDLES         = 0x1007,
  55     CMD_GET_OBJECT_INFO            = 0x1008,
  56     CMD_GET_OBJECT                 = 0x1009,
  57     CMD_DELETE_OBJECT              = 0x100b,
  58     CMD_SEND_OBJECT_INFO           = 0x100c,
  59     CMD_SEND_OBJECT                = 0x100d,
  60     CMD_GET_PARTIAL_OBJECT         = 0x101b,
  61     CMD_GET_OBJECT_PROPS_SUPPORTED = 0x9801,
  62     CMD_GET_OBJECT_PROP_DESC       = 0x9802,
  63     CMD_GET_OBJECT_PROP_VALUE      = 0x9803,
  64
  65     /* response codes */
  66     RES_OK                         = 0x2001,
  67     RES_GENERAL_ERROR              = 0x2002,
  68     RES_SESSION_NOT_OPEN           = 0x2003,
  69     RES_INVALID_TRANSACTION_ID     = 0x2004,
  70     RES_OPERATION_NOT_SUPPORTED    = 0x2005,
  71     RES_PARAMETER_NOT_SUPPORTED    = 0x2006,
  72     RES_INCOMPLETE_TRANSFER        = 0x2007,
  73     RES_INVALID_STORAGE_ID         = 0x2008,
  74     RES_INVALID_OBJECT_HANDLE      = 0x2009,
  75     RES_INVALID_OBJECT_FORMAT_CODE = 0x200b,
  76     RES_STORE_FULL                 = 0x200c,
  77     RES_STORE_READ_ONLY            = 0x200e,
  78     RES_PARTIAL_DELETE             = 0x2012,
  79     RES_STORE_NOT_AVAILABLE        = 0x2013,
  80     RES_SPEC_BY_FORMAT_UNSUPPORTED = 0x2014,
  81     RES_INVALID_OBJECTINFO         = 0x2015,
  82     RES_DESTINATION_UNSUPPORTED    = 0x2020,
  83     RES_INVALID_PARENT_OBJECT      = 0x201a,
  84     RES_INVALID_PARAMETER          = 0x201d,
  85     RES_SESSION_ALREADY_OPEN       = 0x201e,
  86     RES_INVALID_OBJECT_PROP_CODE   = 0xA801,
  87
  88     /* format codes */
  89     FMT_UNDEFINED_OBJECT           = 0x3000,
  90     FMT_ASSOCIATION                = 0x3001,
  91
  92     /* event codes */
  93     EVT_CANCEL_TRANSACTION         = 0x4001,
  94     EVT_OBJ_ADDED                  = 0x4002,
  95     EVT_OBJ_REMOVED                = 0x4003,
  96     EVT_OBJ_INFO_CHANGED           = 0x4007,
  97
  98     /* object properties */
  99     PROP_STORAGE_ID                = 0xDC01,
 100     PROP_OBJECT_FORMAT             = 0xDC02,
 101     PROP_OBJECT_COMPRESSED_SIZE    = 0xDC04,
 102     PROP_PARENT_OBJECT             = 0xDC0B,
 103     PROP_PERSISTENT_UNIQUE_OBJECT_IDENTIFIER = 0xDC41,
 104     PROP_NAME                      = 0xDC44,
 105 };
 106
 107 enum mtp_data_type {
 108     DATA_TYPE_UINT16  = 0x0004,
 109     DATA_TYPE_UINT32  = 0x0006,
 110     DATA_TYPE_UINT64  = 0x0008,
 111     DATA_TYPE_UINT128 = 0x000a,
 112     DATA_TYPE_STRING  = 0xffff,
 113 };
 114
 115 typedef struct {
 116     uint32_t length;
 117     uint16_t type;
 118     uint16_t code;
 119     uint32_t trans;
 120 } QEMU_PACKED mtp_container;
 121
 122 /* ----------------------------------------------------------------------- */
 123
 124 typedef struct MTPState MTPState;
 125 typedef struct MTPControl MTPControl;
 126 typedef struct MTPData MTPData;
 127 typedef struct MTPObject MTPObject;
 128
 129 enum {
 130     EP_DATA_IN = 1,
 131     EP_DATA_OUT,
 132     EP_EVENT,
 133 };
 134
 135 #ifdef CONFIG_INOTIFY1
 136 typedef struct MTPMonEntry MTPMonEntry;
 137
 138 struct MTPMonEntry {
 139     uint32_t event;
 140     uint32_t handle;
 141
 142     QTAILQ_ENTRY(MTPMonEntry) next;
 143 };
 144 #endif
 145
 146 struct MTPControl {
 147     uint16_t     code;
 148     uint32_t     trans;
 149     int          argc;
 150     uint32_t     argv[5];
 151 };
 152
 153 struct MTPData {
 154     uint16_t     code;
 155     uint32_t     trans;
 156     uint64_t     offset;
 157     uint64_t     length;
 158     uint64_t     alloc;
 159     uint8_t      *data;
 160     bool         first;
 161     /* Used for >4G file sizes */
 162     bool         pending;
 163     int          fd;
 164     uint8_t      write_status;
 165     /* Internal pointer per every MTP_WRITE_BUF_SZ */
 166     uint64_t     data_offset;
 167 };
 168
 169 struct MTPObject {
 170     uint32_t     handle;
 171     uint16_t     format;
 172     char         *name;
 173     char         *path;
 174     struct stat  stat;
 175 #ifdef CONFIG_INOTIFY1
 176     /* inotify watch cookie */
 177     int          watchfd;
 178 #endif
 179     MTPObject    *parent;
 180     uint32_t     nchildren;
 181     QLIST_HEAD(, MTPObject) children;
 182     QLIST_ENTRY(MTPObject) list;
 183     bool         have_children;
 184     QTAILQ_ENTRY(MTPObject) next;
 185 };
 186
 187 struct MTPState {
 188     USBDevice    dev;
 189     char         *root;
 190     char         *desc;
 191     uint32_t     flags;
 192
 193     MTPData      *data_in;
 194     MTPData      *data_out;
 195     MTPControl   *result;
 196     uint32_t     session;
 197     uint32_t     next_handle;
 198     bool         readonly;
 199
 200     QTAILQ_HEAD(, MTPObject) objects;
 201 #ifdef CONFIG_INOTIFY1
 202     /* inotify descriptor */
 203     int          inotifyfd;
 204     QTAILQ_HEAD(, MTPMonEntry) events;
 205 #endif
 206     /* Responder is expecting a write operation */
 207     bool write_pending;
 208     struct {
 209         uint32_t parent_handle;
 210         uint16_t format;
 211         uint32_t size;
 212         char *filename;
 213     } dataset;
 214 };
 215
 216 /*
 217  * ObjectInfo dataset received from initiator
 218  * Fields we don't care about are ignored
 219  */
 220 typedef struct {
 221     uint32_t storage_id; /*unused*/
 222     uint16_t format;
 223     uint16_t protection_status; /*unused*/
 224     uint32_t size;
 225     uint16_t thumb_format; /*unused*/
 226     uint32_t thumb_comp_sz; /*unused*/
 227     uint32_t thumb_pix_width; /*unused*/
 228     uint32_t thumb_pix_height; /*unused*/
 229     uint32_t image_pix_width; /*unused*/
 230     uint32_t image_pix_height; /*unused*/
 231     uint32_t image_bit_depth; /*unused*/
 232     uint32_t parent; /*unused*/
 233     uint16_t assoc_type;
 234     uint32_t assoc_desc;
 235     uint32_t seq_no; /*unused*/
 236     uint8_t length; /*part of filename field*/
 237     uint16_t filename[0];
 238     char date_created[0]; /*unused*/
 239     char date_modified[0]; /*unused*/
 240     char keywords[0]; /*unused*/
 241     /* string and other data follows */
 242 } QEMU_PACKED ObjectInfo;
 243
 244 #define TYPE_USB_MTP "usb-mtp"
 245 #define USB_MTP(obj) OBJECT_CHECK(MTPState, (obj), TYPE_USB_MTP)
 246
 247 #define QEMU_STORAGE_ID 0x00010001
 248
 249 #define MTP_FLAG_WRITABLE 0
 250
 251 #define FLAG_SET(_mtp, _flag)  ((_mtp)->flags & (1 << (_flag)))
 252
 253 /* ----------------------------------------------------------------------- */
 254
 255 #define MTP_MANUFACTURER  "QEMU"
 256 #define MTP_PRODUCT       "QEMU filesharing"
 257 #define MTP_WRITE_BUF_SZ  (512 * KiB)
 258
 259 enum {
 260     STR_MANUFACTURER = 1,
 261     STR_PRODUCT,
 262     STR_SERIALNUMBER,
 263     STR_MTP,
 264     STR_CONFIG_FULL,
 265     STR_CONFIG_HIGH,
 266     STR_CONFIG_SUPER,
 267 };
 268
 269 static const USBDescStrings desc_strings = {
 270     [STR_MANUFACTURER] = MTP_MANUFACTURER,
 271     [STR_PRODUCT]      = MTP_PRODUCT,
 272     [STR_SERIALNUMBER] = "34617",
 273     [STR_MTP]          = "MTP",
 274     [STR_CONFIG_FULL]  = "Full speed config (usb 1.1)",
 275     [STR_CONFIG_HIGH]  = "High speed config (usb 2.0)",
 276     [STR_CONFIG_SUPER] = "Super speed config (usb 3.0)",
 277 };
 278
 279 static const USBDescIface desc_iface_full = {
 280     .bInterfaceNumber              = 0,
 281     .bNumEndpoints                 = 3,
 282     .bInterfaceClass               = USB_CLASS_STILL_IMAGE,
 283     .bInterfaceSubClass            = 0x01,
 284     .bInterfaceProtocol            = 0x01,
 285     .iInterface                    = STR_MTP,
 286     .eps = (USBDescEndpoint[]) {
 287         {
 288             .bEndpointAddress      = USB_DIR_IN | EP_DATA_IN,
 289             .bmAttributes          = USB_ENDPOINT_XFER_BULK,
 290             .wMaxPacketSize        = 64,
 291         },{
 292             .bEndpointAddress      = USB_DIR_OUT | EP_DATA_OUT,
 293             .bmAttributes          = USB_ENDPOINT_XFER_BULK,
 294             .wMaxPacketSize        = 64,
 295         },{
 296             .bEndpointAddress      = USB_DIR_IN | EP_EVENT,
 297             .bmAttributes          = USB_ENDPOINT_XFER_INT,
 298             .wMaxPacketSize        = 64,
 299             .bInterval             = 0x0a,
 300         },
 301     }
 302 };
 303
 304 static const USBDescDevice desc_device_full = {
 305     .bcdUSB                        = 0x0200,
 306     .bMaxPacketSize0               = 8,
 307     .bNumConfigurations            = 1,
 308     .confs = (USBDescConfig[]) {
 309         {
 310             .bNumInterfaces        = 1,
 311             .bConfigurationValue   = 1,
 312             .iConfiguration        = STR_CONFIG_FULL,
 313             .bmAttributes          = USB_CFG_ATT_ONE | USB_CFG_ATT_WAKEUP,
 314             .bMaxPower             = 2,
 315             .nif = 1,
 316             .ifs = &desc_iface_full,
 317         },
 318     },
 319 };
 320
 321 static const USBDescIface desc_iface_high = {
 322     .bInterfaceNumber              = 0,
 323     .bNumEndpoints                 = 3,
 324     .bInterfaceClass               = USB_CLASS_STILL_IMAGE,
 325     .bInterfaceSubClass            = 0x01,
 326     .bInterfaceProtocol            = 0x01,
 327     .iInterface                    = STR_MTP,
 328     .eps = (USBDescEndpoint[]) {
 329         {
 330             .bEndpointAddress      = USB_DIR_IN | EP_DATA_IN,
 331             .bmAttributes          = USB_ENDPOINT_XFER_BULK,
 332             .wMaxPacketSize        = 512,
 333         },{
 334             .bEndpointAddress      = USB_DIR_OUT | EP_DATA_OUT,
 335             .bmAttributes          = USB_ENDPOINT_XFER_BULK,
 336             .wMaxPacketSize        = 512,
 337         },{
 338             .bEndpointAddress      = USB_DIR_IN | EP_EVENT,
 339             .bmAttributes          = USB_ENDPOINT_XFER_INT,
 340             .wMaxPacketSize        = 64,
 341             .bInterval             = 0x0a,
 342         },
 343     }
 344 };
 345
 346 static const USBDescDevice desc_device_high = {
 347     .bcdUSB                        = 0x0200,
 348     .bMaxPacketSize0               = 64,
 349     .bNumConfigurations            = 1,
 350     .confs = (USBDescConfig[]) {
 351         {
 352             .bNumInterfaces        = 1,
 353             .bConfigurationValue   = 1,
 354             .iConfiguration        = STR_CONFIG_HIGH,
 355             .bmAttributes          = USB_CFG_ATT_ONE | USB_CFG_ATT_WAKEUP,
 356             .bMaxPower             = 2,
 357             .nif = 1,
 358             .ifs = &desc_iface_high,
 359         },
 360     },
 361 };
 362
 363 static const USBDescMSOS desc_msos = {
 364     .CompatibleID = "MTP",
 365     .SelectiveSuspendEnabled = true,
 366 };
 367
 368 static const USBDesc desc = {
 369     .id = {
 370         .idVendor          = 0x46f4, /* CRC16() of "QEMU" */
 371         .idProduct         = 0x0004,
 372         .bcdDevice         = 0,
 373         .iManufacturer     = STR_MANUFACTURER,
 374         .iProduct          = STR_PRODUCT,
 375         .iSerialNumber     = STR_SERIALNUMBER,
 376     },
 377     .full  = &desc_device_full,
 378     .high  = &desc_device_high,
 379     .str   = desc_strings,
 380     .msos  = &desc_msos,
 381 };
 382
 383 /* ----------------------------------------------------------------------- */
 384
 385 static MTPObject *usb_mtp_object_alloc(MTPState *s, uint32_t handle,
 386                                        MTPObject *parent, char *name)
 387 {
 388     MTPObject *o = g_new0(MTPObject, 1);
 389
 390     if (name[0] == '.') {
 391         goto ignore;
 392     }
 393
 394     o->handle = handle;
 395     o->parent = parent;
 396     o->name = g_strdup(name);
 397     if (parent == NULL) {
 398         o->path = g_strdup(name);
 399     } else {
 400         o->path = g_strdup_printf("%s/%s", parent->path, name);
 401     }
 402
 403     if (lstat(o->path, &o->stat) != 0) {
 404         goto ignore;
 405     }
 406     if (S_ISREG(o->stat.st_mode)) {
 407         o->format = FMT_UNDEFINED_OBJECT;
 408     } else if (S_ISDIR(o->stat.st_mode)) {
 409         o->format = FMT_ASSOCIATION;
 410     } else {
 411         goto ignore;
 412     }
 413
 414     if (access(o->path, R_OK) != 0) {
 415         goto ignore;
 416     }
 417
 418     trace_usb_mtp_object_alloc(s->dev.addr, o->handle, o->path);
 419
 420     QTAILQ_INSERT_TAIL(&s->objects, o, next);
 421     return o;
 422
 423 ignore:
 424     g_free(o->name);
 425     g_free(o->path);
 426     g_free(o);
 427     return NULL;
 428 }
 429
 430 static void usb_mtp_object_free(MTPState *s, MTPObject *o)
 431 {
 432     MTPObject *iter;
 433
 434     if (!o) {
 435         return;
 436     }
 437
 438     trace_usb_mtp_object_free(s->dev.addr, o->handle, o->path);
 439
 440     QTAILQ_REMOVE(&s->objects, o, next);
 441     if (o->parent) {
 442         QLIST_REMOVE(o, list);
 443         o->parent->nchildren--;
 444     }
 445
 446     while (!QLIST_EMPTY(&o->children)) {
 447         iter = QLIST_FIRST(&o->children);
 448         usb_mtp_object_free(s, iter);
 449     }
 450     g_free(o->name);
 451     g_free(o->path);
 452     g_free(o);
 453 }
 454
 455 static MTPObject *usb_mtp_object_lookup(MTPState *s, uint32_t handle)
 456 {
 457     MTPObject *o;
 458
 459     QTAILQ_FOREACH(o, &s->objects, next) {
 460         if (o->handle == handle) {
 461             return o;
 462         }
 463     }
 464     return NULL;
 465 }
 466
 467 static MTPObject *usb_mtp_add_child(MTPState *s, MTPObject *o,
 468                                     char *name)
 469 {
 470     MTPObject *child =
 471         usb_mtp_object_alloc(s, s->next_handle++, o, name);
 472
 473     if (child) {
 474         trace_usb_mtp_add_child(s->dev.addr, child->handle, child->path);
 475         QLIST_INSERT_HEAD(&o->children, child, list);
 476         o->nchildren++;
 477
 478         if (child->format == FMT_ASSOCIATION) {
 479             QLIST_INIT(&child->children);
 480         }
 481     }
 482
 483     return child;
 484 }
 485
 486 static MTPObject *usb_mtp_object_lookup_name(MTPObject *parent,
 487                                              char *name, int len)
 488 {
 489     MTPObject *iter;
 490
 491     QLIST_FOREACH(iter, &parent->children, list) {
 492         if (strncmp(iter->name, name, len) == 0) {
 493             return iter;
 494         }
 495     }
 496
 497     return NULL;
 498 }
 499
 500 #ifdef CONFIG_INOTIFY1
 501 static MTPObject *usb_mtp_object_lookup_wd(MTPState *s, int wd)
 502 {
 503     MTPObject *iter;
 504
 505     QTAILQ_FOREACH(iter, &s->objects, next) {
 506         if (iter->watchfd == wd) {
 507             return iter;
 508         }
 509     }
 510
 511     return NULL;
 512 }
 513
 514 static void inotify_watchfn(void *arg)
 515 {
 516     MTPState *s = arg;
 517     ssize_t bytes;
 518     /* From the man page: atleast one event can be read */
 519     int pos;
 520     char buf[sizeof(struct inotify_event) + NAME_MAX + 1];
 521
 522     for (;;) {
 523         bytes = read(s->inotifyfd, buf, sizeof(buf));
 524         pos = 0;
 525
 526         if (bytes <= 0) {
 527             /* Better luck next time */
 528             return;
 529         }
 530
 531         /*
 532          * TODO: Ignore initiator initiated events.
 533          * For now we are good because the store is RO
 534          */
 535         while (bytes > 0) {
 536             char *p = buf + pos;
 537             struct inotify_event *event = (struct inotify_event *)p;
 538             int watchfd = 0;
 539             uint32_t mask = event->mask & (IN_CREATE | IN_DELETE |
 540                                            IN_MODIFY | IN_IGNORED);
 541             MTPObject *parent = usb_mtp_object_lookup_wd(s, event->wd);
 542             MTPMonEntry *entry = NULL;
 543             MTPObject *o;
 544
 545             pos = pos + sizeof(struct inotify_event) + event->len;
 546             bytes = bytes - pos;
 547
 548             if (!parent) {
 549                 continue;
 550             }
 551
 552             switch (mask) {
 553             case IN_CREATE:
 554                 if (usb_mtp_object_lookup_name
 555                     (parent, event->name, event->len)) {
 556                     /* Duplicate create event */
 557                     continue;
 558                 }
 559                 entry = g_new0(MTPMonEntry, 1);
 560                 entry->handle = s->next_handle;
 561                 entry->event = EVT_OBJ_ADDED;
 562                 o = usb_mtp_add_child(s, parent, event->name);
 563                 if (!o) {
 564                     g_free(entry);
 565                     continue;
 566                 }
 567                 o->watchfd = watchfd;
 568                 trace_usb_mtp_inotify_event(s->dev.addr, event->name,
 569                                             event->mask, "Obj Added");
 570                 break;
 571
 572             case IN_DELETE:
 573                 /*
 574                  * The kernel issues a IN_IGNORED event
 575                  * when a dir containing a watchpoint is
 576                  * deleted, so we don't have to delete the
 577                  * watchpoint
 578                  */
 579                 o = usb_mtp_object_lookup_name(parent, event->name, event->len);
 580                 if (!o) {
 581                     continue;
 582                 }
 583                 entry = g_new0(MTPMonEntry, 1);
 584                 entry->handle = o->handle;
 585                 entry->event = EVT_OBJ_REMOVED;
 586                 trace_usb_mtp_inotify_event(s->dev.addr, o->path,
 587                                       event->mask, "Obj Deleted");
 588                 usb_mtp_object_free(s, o);
 589                 break;
 590
 591             case IN_MODIFY:
 592                 o = usb_mtp_object_lookup_name(parent, event->name, event->len);
 593                 if (!o) {
 594                     continue;
 595                 }
 596                 entry = g_new0(MTPMonEntry, 1);
 597                 entry->handle = o->handle;
 598                 entry->event = EVT_OBJ_INFO_CHANGED;
 599                 trace_usb_mtp_inotify_event(s->dev.addr, o->path,
 600                                       event->mask, "Obj Modified");
 601                 break;
 602
 603             case IN_IGNORED:
 604                 trace_usb_mtp_inotify_event(s->dev.addr, parent->path,
 605                                       event->mask, "Obj parent dir ignored");
 606                 break;
 607
 608             default:
 609                 fprintf(stderr, "usb-mtp: failed to parse inotify event\n");
 610                 continue;
 611             }
 612
 613             if (entry) {
 614                 QTAILQ_INSERT_HEAD(&s->events, entry, next);
 615             }
 616         }
 617     }
 618 }
 619
 620 static int usb_mtp_inotify_init(MTPState *s)
 621 {
 622     int fd;
 623
 624     fd = inotify_init1(IN_NONBLOCK);
 625     if (fd == -1) {
 626         return 1;
 627     }
 628
 629     QTAILQ_INIT(&s->events);
 630     s->inotifyfd = fd;
 631
 632     qemu_set_fd_handler(fd, inotify_watchfn, NULL, s);
 633
 634     return 0;
 635 }
 636
 637 static void usb_mtp_inotify_cleanup(MTPState *s)
 638 {
 639     MTPMonEntry *e, *p;
 640
 641     if (!s->inotifyfd) {
 642         return;
 643     }
 644
 645     qemu_set_fd_handler(s->inotifyfd, NULL, NULL, s);
 646     close(s->inotifyfd);
 647
 648     QTAILQ_FOREACH_SAFE(e, &s->events, next, p) {
 649         QTAILQ_REMOVE(&s->events, e, next);
 650         g_free(e);
 651     }
 652 }
 653
 654 static int usb_mtp_add_watch(int inotifyfd, char *path)
 655 {
 656     uint32_t mask = IN_CREATE | IN_DELETE | IN_MODIFY |
 657         IN_ISDIR;
 658
 659     return inotify_add_watch(inotifyfd, path, mask);
 660 }
 661 #endif
 662
 663 static void usb_mtp_object_readdir(MTPState *s, MTPObject *o)
 664 {
 665     struct dirent *entry;
 666     DIR *dir;
 667     int fd;
 668
 669     if (o->have_children) {
 670         return;
 671     }
 672     o->have_children = true;
 673
 674     fd = open(o->path, O_DIRECTORY | O_CLOEXEC | O_NOFOLLOW);
 675     if (fd < 0) {
 676         return;
 677     }
 678     dir = fdopendir(fd);
 679     if (!dir) {
 680         close(fd);
 681         return;
 682     }
 683 #ifdef CONFIG_INOTIFY1
 684     int watchfd = usb_mtp_add_watch(s->inotifyfd, o->path);
 685     if (watchfd == -1) {
 686         fprintf(stderr, "usb-mtp: failed to add watch for %s\n", o->path);
 687     } else {
 688         trace_usb_mtp_inotify_event(s->dev.addr, o->path,
 689                                     0, "Watch Added");
 690         o->watchfd = watchfd;
 691     }
 692 #endif
 693     while ((entry = readdir(dir)) != NULL) {
 694         usb_mtp_add_child(s, o, entry->d_name);
 695     }
 696     closedir(dir);
 697 }
 698
 699 /* ----------------------------------------------------------------------- */
 700
 701 static MTPData *usb_mtp_data_alloc(MTPControl *c)
 702 {
 703     MTPData *data = g_new0(MTPData, 1);
 704
 705     data->code  = c->code;
 706     data->trans = c->trans;
 707     data->fd    = -1;
 708     data->first = true;
 709     return data;
 710 }
 711
 712 static void usb_mtp_data_free(MTPData *data)
 713 {
 714     if (data == NULL) {
 715         return;
 716     }
 717     if (data->fd != -1) {
 718         close(data->fd);
 719     }
 720     g_free(data->data);
 721     g_free(data);
 722 }
 723
 724 static void usb_mtp_realloc(MTPData *data, uint32_t bytes)
 725 {
 726     if (data->length + bytes <= data->alloc) {
 727         return;
 728     }
 729     data->alloc = (data->length + bytes + 0xff) & ~0xff;
 730     data->data  = g_realloc(data->data, data->alloc);
 731 }
 732
 733 static void usb_mtp_add_u8(MTPData *data, uint8_t val)
 734 {
 735     usb_mtp_realloc(data, 1);
 736     data->data[data->length++] = val;
 737 }
 738
 739 static void usb_mtp_add_u16(MTPData *data, uint16_t val)
 740 {
 741     usb_mtp_realloc(data, 2);
 742     data->data[data->length++] = (val >> 0) & 0xff;
 743     data->data[data->length++] = (val >> 8) & 0xff;
 744 }
 745
 746 static void usb_mtp_add_u32(MTPData *data, uint32_t val)
 747 {
 748     usb_mtp_realloc(data, 4);
 749     data->data[data->length++] = (val >>  0) & 0xff;
 750     data->data[data->length++] = (val >>  8) & 0xff;
 751     data->data[data->length++] = (val >> 16) & 0xff;
 752     data->data[data->length++] = (val >> 24) & 0xff;
 753 }
 754
 755 static void usb_mtp_add_u64(MTPData *data, uint64_t val)
 756 {
 757     usb_mtp_realloc(data, 8);
 758     data->data[data->length++] = (val >>  0) & 0xff;
 759     data->data[data->length++] = (val >>  8) & 0xff;
 760     data->data[data->length++] = (val >> 16) & 0xff;
 761     data->data[data->length++] = (val >> 24) & 0xff;
 762     data->data[data->length++] = (val >> 32) & 0xff;
 763     data->data[data->length++] = (val >> 40) & 0xff;
 764     data->data[data->length++] = (val >> 48) & 0xff;
 765     data->data[data->length++] = (val >> 56) & 0xff;
 766 }
 767
 768 static void usb_mtp_add_u16_array(MTPData *data, uint32_t len,
 769                                   const uint16_t *vals)
 770 {
 771     int i;
 772
 773     usb_mtp_add_u32(data, len);
 774     for (i = 0; i < len; i++) {
 775         usb_mtp_add_u16(data, vals[i]);
 776     }
 777 }
 778
 779 static void usb_mtp_add_u32_array(MTPData *data, uint32_t len,
 780                                   const uint32_t *vals)
 781 {
 782     int i;
 783
 784     usb_mtp_add_u32(data, len);
 785     for (i = 0; i < len; i++) {
 786         usb_mtp_add_u32(data, vals[i]);
 787     }
 788 }
 789
 790 static void usb_mtp_add_wstr(MTPData *data, const wchar_t *str)
 791 {
 792     uint32_t len = wcslen(str);
 793     int i;
 794
 795     if (len > 0) {
 796         len++; /* include terminating L'\0' */
 797     }
 798
 799     usb_mtp_add_u8(data, len);
 800     for (i = 0; i < len; i++) {
 801         usb_mtp_add_u16(data, str[i]);
 802     }
 803 }
 804
 805 static void usb_mtp_add_str(MTPData *data, const char *str)
 806 {
 807     uint32_t len = strlen(str)+1;
 808     wchar_t *wstr = g_new(wchar_t, len);
 809     size_t ret;
 810
 811     ret = mbstowcs(wstr, str, len);
 812     if (ret == -1) {
 813         usb_mtp_add_wstr(data, L"Oops");
 814     } else {
 815         usb_mtp_add_wstr(data, wstr);
 816     }
 817
 818     g_free(wstr);
 819 }
 820
 821 static void usb_mtp_add_time(MTPData *data, time_t time)
 822 {
 823     char buf[16];
 824     struct tm tm;
 825
 826     gmtime_r(&time, &tm);
 827     strftime(buf, sizeof(buf), "%Y%m%dT%H%M%S", &tm);
 828     usb_mtp_add_str(data, buf);
 829 }
 830
 831 /* ----------------------------------------------------------------------- */
 832
 833 static void usb_mtp_queue_result(MTPState *s, uint16_t code, uint32_t trans,
 834                                  int argc, uint32_t arg0, uint32_t arg1,
 835                                  uint32_t arg2)
 836 {
 837     MTPControl *c = g_new0(MTPControl, 1);
 838
 839     c->code  = code;
 840     c->trans = trans;
 841     c->argc  = argc;
 842     if (argc > 0) {
 843         c->argv[0] = arg0;
 844     }
 845     if (argc > 1) {
 846         c->argv[1] = arg1;
 847     }
 848     if (argc > 2) {
 849         c->argv[2] = arg2;
 850     }
 851
 852     assert(s->result == NULL);
 853     s->result = c;
 854 }
 855
 856 /* ----------------------------------------------------------------------- */
 857
 858 static MTPData *usb_mtp_get_device_info(MTPState *s, MTPControl *c)
 859 {
 860     static const uint16_t ops[] = {
 861         CMD_GET_DEVICE_INFO,
 862         CMD_OPEN_SESSION,
 863         CMD_CLOSE_SESSION,
 864         CMD_GET_STORAGE_IDS,
 865         CMD_GET_STORAGE_INFO,
 866         CMD_GET_NUM_OBJECTS,
 867         CMD_GET_OBJECT_HANDLES,
 868         CMD_GET_OBJECT_INFO,
 869         CMD_DELETE_OBJECT,
 870         CMD_SEND_OBJECT_INFO,
 871         CMD_SEND_OBJECT,
 872         CMD_GET_OBJECT,
 873         CMD_GET_PARTIAL_OBJECT,
 874         CMD_GET_OBJECT_PROPS_SUPPORTED,
 875         CMD_GET_OBJECT_PROP_DESC,
 876         CMD_GET_OBJECT_PROP_VALUE,
 877     };
 878     static const uint16_t fmt[] = {
 879         FMT_UNDEFINED_OBJECT,
 880         FMT_ASSOCIATION,
 881     };
 882     MTPData *d = usb_mtp_data_alloc(c);
 883
 884     trace_usb_mtp_op_get_device_info(s->dev.addr);
 885
 886     usb_mtp_add_u16(d, 100);
 887     usb_mtp_add_u32(d, 0x00000006);
 888     usb_mtp_add_u16(d, 0x0064);
 889     usb_mtp_add_wstr(d, L"");
 890     usb_mtp_add_u16(d, 0x0000);
 891
 892     usb_mtp_add_u16_array(d, ARRAY_SIZE(ops), ops);
 893     usb_mtp_add_u16_array(d, 0, NULL);
 894     usb_mtp_add_u16_array(d, 0, NULL);
 895     usb_mtp_add_u16_array(d, 0, NULL);
 896     usb_mtp_add_u16_array(d, ARRAY_SIZE(fmt), fmt);
 897
 898     usb_mtp_add_wstr(d, L"" MTP_MANUFACTURER);
 899     usb_mtp_add_wstr(d, L"" MTP_PRODUCT);
 900     usb_mtp_add_wstr(d, L"0.1");
 901     usb_mtp_add_wstr(d, L"0123456789abcdef0123456789abcdef");
 902
 903     return d;
 904 }
 905
 906 static MTPData *usb_mtp_get_storage_ids(MTPState *s, MTPControl *c)
 907 {
 908     static const uint32_t ids[] = {
 909         QEMU_STORAGE_ID,
 910     };
 911     MTPData *d = usb_mtp_data_alloc(c);
 912
 913     trace_usb_mtp_op_get_storage_ids(s->dev.addr);
 914
 915     usb_mtp_add_u32_array(d, ARRAY_SIZE(ids), ids);
 916
 917     return d;
 918 }
 919
 920 static MTPData *usb_mtp_get_storage_info(MTPState *s, MTPControl *c)
 921 {
 922     MTPData *d = usb_mtp_data_alloc(c);
 923     struct statvfs buf;
 924     int rc;
 925
 926     trace_usb_mtp_op_get_storage_info(s->dev.addr);
 927
 928     if (FLAG_SET(s, MTP_FLAG_WRITABLE)) {
 929         usb_mtp_add_u16(d, 0x0003);
 930         usb_mtp_add_u16(d, 0x0002);
 931         usb_mtp_add_u16(d, 0x0000);
 932     } else {
 933         usb_mtp_add_u16(d, 0x0001);
 934         usb_mtp_add_u16(d, 0x0002);
 935         usb_mtp_add_u16(d, 0x0001);
 936     }
 937
 938     rc = statvfs(s->root, &buf);
 939     if (rc == 0) {
 940         usb_mtp_add_u64(d, (uint64_t)buf.f_frsize * buf.f_blocks);
 941         usb_mtp_add_u64(d, (uint64_t)buf.f_bavail * buf.f_blocks);
 942         usb_mtp_add_u32(d, buf.f_ffree);
 943     } else {
 944         usb_mtp_add_u64(d, 0xffffffff);
 945         usb_mtp_add_u64(d, 0xffffffff);
 946         usb_mtp_add_u32(d, 0xffffffff);
 947     }
 948
 949     usb_mtp_add_str(d, s->desc);
 950     usb_mtp_add_wstr(d, L"123456789abcdef");
 951     return d;
 952 }
 953
 954 static MTPData *usb_mtp_get_object_handles(MTPState *s, MTPControl *c,
 955                                            MTPObject *o)
 956 {
 957     MTPData *d = usb_mtp_data_alloc(c);
 958     uint32_t i = 0, handles[o->nchildren];
 959     MTPObject *iter;
 960
 961     trace_usb_mtp_op_get_object_handles(s->dev.addr, o->handle, o->path);
 962
 963     QLIST_FOREACH(iter, &o->children, list) {
 964         handles[i++] = iter->handle;
 965     }
 966     assert(i == o->nchildren);
 967     usb_mtp_add_u32_array(d, o->nchildren, handles);
 968
 969     return d;
 970 }
 971
 972 static MTPData *usb_mtp_get_object_info(MTPState *s, MTPControl *c,
 973                                         MTPObject *o)
 974 {
 975     MTPData *d = usb_mtp_data_alloc(c);
 976
 977     trace_usb_mtp_op_get_object_info(s->dev.addr, o->handle, o->path);
 978
 979     usb_mtp_add_u32(d, QEMU_STORAGE_ID);
 980     usb_mtp_add_u16(d, o->format);
 981     usb_mtp_add_u16(d, 0);
 982
 983     if (o->stat.st_size > 0xFFFFFFFF) {
 984         usb_mtp_add_u32(d, 0xFFFFFFFF);
 985     } else {
 986         usb_mtp_add_u32(d, o->stat.st_size);
 987     }
 988
 989     usb_mtp_add_u16(d, 0);
 990     usb_mtp_add_u32(d, 0);
 991     usb_mtp_add_u32(d, 0);
 992     usb_mtp_add_u32(d, 0);
 993     usb_mtp_add_u32(d, 0);
 994     usb_mtp_add_u32(d, 0);
 995     usb_mtp_add_u32(d, 0);
 996
 997     if (o->parent) {
 998         usb_mtp_add_u32(d, o->parent->handle);
 999     } else {
1000         usb_mtp_add_u32(d, 0);
1001     }
1002     if (o->format == FMT_ASSOCIATION) {
1003         usb_mtp_add_u16(d, 0x0001);
1004         usb_mtp_add_u32(d, 0x00000001);
1005         usb_mtp_add_u32(d, 0);
1006     } else {
1007         usb_mtp_add_u16(d, 0);
1008         usb_mtp_add_u32(d, 0);
1009         usb_mtp_add_u32(d, 0);
1010     }
1011
1012     usb_mtp_add_str(d, o->name);
1013     usb_mtp_add_time(d, o->stat.st_ctime);
1014     usb_mtp_add_time(d, o->stat.st_mtime);
1015     usb_mtp_add_wstr(d, L"");
1016
1017     return d;
1018 }
1019
1020 static MTPData *usb_mtp_get_object(MTPState *s, MTPControl *c,
1021                                    MTPObject *o)
1022 {
1023     MTPData *d = usb_mtp_data_alloc(c);
1024
1025     trace_usb_mtp_op_get_object(s->dev.addr, o->handle, o->path);
1026
1027     d->fd = open(o->path, O_RDONLY | O_CLOEXEC | O_NOFOLLOW);
1028     if (d->fd == -1) {
1029         usb_mtp_data_free(d);
1030         return NULL;
1031     }
1032     d->length = o->stat.st_size;
1033     d->alloc  = 512;
1034     d->data   = g_malloc(d->alloc);
1035     return d;
1036 }
1037
1038 static MTPData *usb_mtp_get_partial_object(MTPState *s, MTPControl *c,
1039                                            MTPObject *o)
1040 {
1041     MTPData *d;
1042     off_t offset;
1043
1044     if (c->argc <= 2) {
1045         return NULL;
1046     }
1047     trace_usb_mtp_op_get_partial_object(s->dev.addr, o->handle, o->path,
1048                                         c->argv[1], c->argv[2]);
1049
1050     d = usb_mtp_data_alloc(c);
1051     d->fd = open(o->path, O_RDONLY | O_CLOEXEC | O_NOFOLLOW);
1052     if (d->fd == -1) {
1053         usb_mtp_data_free(d);
1054         return NULL;
1055     }
1056
1057     offset = c->argv[1];
1058     if (offset > o->stat.st_size) {
1059         offset = o->stat.st_size;
1060     }
1061     if (lseek(d->fd, offset, SEEK_SET) < 0) {
1062         usb_mtp_data_free(d);
1063         return NULL;
1064     }
1065
1066     d->length = c->argv[2];
1067     if (d->length > o->stat.st_size - offset) {
1068         d->length = o->stat.st_size - offset;
1069     }
1070
1071     return d;
1072 }
1073
1074 static MTPData *usb_mtp_get_object_props_supported(MTPState *s, MTPControl *c)
1075 {
1076     static const uint16_t props[] = {
1077         PROP_STORAGE_ID,
1078         PROP_OBJECT_FORMAT,
1079         PROP_OBJECT_COMPRESSED_SIZE,
1080         PROP_PARENT_OBJECT,
1081         PROP_PERSISTENT_UNIQUE_OBJECT_IDENTIFIER,
1082         PROP_NAME,
1083     };
1084     MTPData *d = usb_mtp_data_alloc(c);
1085     usb_mtp_add_u16_array(d, ARRAY_SIZE(props), props);
1086
1087     return d;
1088 }
1089
1090 static MTPData *usb_mtp_get_object_prop_desc(MTPState *s, MTPControl *c)
1091 {
1092     MTPData *d = usb_mtp_data_alloc(c);
1093     switch (c->argv[0]) {
1094     case PROP_STORAGE_ID:
1095         usb_mtp_add_u16(d, PROP_STORAGE_ID);
1096         usb_mtp_add_u16(d, DATA_TYPE_UINT32);
1097         usb_mtp_add_u8(d, 0x00);
1098         usb_mtp_add_u32(d, 0x00000000);
1099         usb_mtp_add_u32(d, 0x00000000);
1100         usb_mtp_add_u8(d, 0x00);
1101         break;
1102     case PROP_OBJECT_FORMAT:
1103         usb_mtp_add_u16(d, PROP_OBJECT_FORMAT);
1104         usb_mtp_add_u16(d, DATA_TYPE_UINT16);
1105         usb_mtp_add_u8(d, 0x00);
1106         usb_mtp_add_u16(d, 0x0000);
1107         usb_mtp_add_u32(d, 0x00000000);
1108         usb_mtp_add_u8(d, 0x00);
1109         break;
1110     case PROP_OBJECT_COMPRESSED_SIZE:
1111         usb_mtp_add_u16(d, PROP_OBJECT_COMPRESSED_SIZE);
1112         usb_mtp_add_u16(d, DATA_TYPE_UINT64);
1113         usb_mtp_add_u8(d, 0x00);
1114         usb_mtp_add_u64(d, 0x0000000000000000);
1115         usb_mtp_add_u32(d, 0x00000000);
1116         usb_mtp_add_u8(d, 0x00);
1117         break;
1118     case PROP_PARENT_OBJECT:
1119         usb_mtp_add_u16(d, PROP_PARENT_OBJECT);
1120         usb_mtp_add_u16(d, DATA_TYPE_UINT32);
1121         usb_mtp_add_u8(d, 0x00);
1122         usb_mtp_add_u32(d, 0x00000000);
1123         usb_mtp_add_u32(d, 0x00000000);
1124         usb_mtp_add_u8(d, 0x00);
1125         break;
1126     case PROP_PERSISTENT_UNIQUE_OBJECT_IDENTIFIER:
1127         usb_mtp_add_u16(d, PROP_PERSISTENT_UNIQUE_OBJECT_IDENTIFIER);
1128         usb_mtp_add_u16(d, DATA_TYPE_UINT128);
1129         usb_mtp_add_u8(d, 0x00);
1130         usb_mtp_add_u64(d, 0x0000000000000000);
1131         usb_mtp_add_u64(d, 0x0000000000000000);
1132         usb_mtp_add_u32(d, 0x00000000);
1133         usb_mtp_add_u8(d, 0x00);
1134         break;
1135     case PROP_NAME:
1136         usb_mtp_add_u16(d, PROP_NAME);
1137         usb_mtp_add_u16(d, DATA_TYPE_STRING);
1138         usb_mtp_add_u8(d, 0x00);
1139         usb_mtp_add_u8(d, 0x00);
1140         usb_mtp_add_u32(d, 0x00000000);
1141         usb_mtp_add_u8(d, 0x00);
1142         break;
1143     default:
1144         usb_mtp_data_free(d);
1145         return NULL;
1146     }
1147
1148     return d;
1149 }
1150
1151 static MTPData *usb_mtp_get_object_prop_value(MTPState *s, MTPControl *c,
1152                                               MTPObject *o)
1153 {
1154     MTPData *d = usb_mtp_data_alloc(c);
1155     switch (c->argv[1]) {
1156     case PROP_STORAGE_ID:
1157         usb_mtp_add_u32(d, QEMU_STORAGE_ID);
1158         break;
1159     case PROP_OBJECT_FORMAT:
1160         usb_mtp_add_u16(d, o->format);
1161         break;
1162     case PROP_OBJECT_COMPRESSED_SIZE:
1163         usb_mtp_add_u64(d, o->stat.st_size);
1164         break;
1165     case PROP_PARENT_OBJECT:
1166         if (o->parent == NULL) {
1167             usb_mtp_add_u32(d, 0x00000000);
1168         } else {
1169             usb_mtp_add_u32(d, o->parent->handle);
1170         }
1171         break;
1172     case PROP_PERSISTENT_UNIQUE_OBJECT_IDENTIFIER:
1173         /* Should be persistent between sessions,
1174          * but using our objedt ID is "good enough"
1175          * for now */
1176         usb_mtp_add_u64(d, 0x0000000000000000);
1177         usb_mtp_add_u64(d, o->handle);
1178         break;
1179     case PROP_NAME:
1180         usb_mtp_add_str(d, o->name);
1181         break;
1182     default:
1183         usb_mtp_data_free(d);
1184         return NULL;
1185     }
1186
1187     return d;
1188 }
1189
1190 /* Return correct return code for a delete event */
1191 enum {
1192     ALL_DELETE,
1193     PARTIAL_DELETE,
1194     READ_ONLY,
1195 };
1196
1197 /* Assumes that children, if any, have been already freed */
1198 static void usb_mtp_object_free_one(MTPState *s, MTPObject *o)
1199 {
1200 #ifndef CONFIG_INOTIFY1
1201     assert(o->nchildren == 0);
1202     QTAILQ_REMOVE(&s->objects, o, next);
1203     g_free(o->name);
1204     g_free(o->path);
1205     g_free(o);
1206 #endif
1207 }
1208
1209 static int usb_mtp_deletefn(MTPState *s, MTPObject *o, uint32_t trans)
1210 {
1211     MTPObject *iter, *iter2;
1212     bool partial_delete = false;
1213     bool success = false;
1214
1215     /*
1216      * TODO: Add support for Protection Status
1217      */
1218
1219     QLIST_FOREACH(iter, &o->children, list) {
1220         if (iter->format == FMT_ASSOCIATION) {
1221             QLIST_FOREACH(iter2, &iter->children, list) {
1222                 usb_mtp_deletefn(s, iter2, trans);
1223             }
1224         }
1225     }
1226
1227     if (o->format == FMT_UNDEFINED_OBJECT) {
1228         if (remove(o->path)) {
1229             partial_delete = true;
1230         } else {
1231             usb_mtp_object_free_one(s, o);
1232             success = true;
1233         }
1234     }
1235
1236     if (o->format == FMT_ASSOCIATION) {
1237         if (rmdir(o->path)) {
1238             partial_delete = true;
1239         } else {
1240             usb_mtp_object_free_one(s, o);
1241             success = true;
1242         }
1243     }
1244
1245     if (success && partial_delete) {
1246         return PARTIAL_DELETE;
1247     }
1248     if (!success && partial_delete) {
1249         return READ_ONLY;
1250     }
1251     return ALL_DELETE;
1252 }
1253
1254 static void usb_mtp_object_delete(MTPState *s, uint32_t handle,
1255                                   uint32_t format_code, uint32_t trans)
1256 {
1257     MTPObject *o;
1258     int ret;
1259
1260     /* Return error if store is read-only */
1261     if (!FLAG_SET(s, MTP_FLAG_WRITABLE)) {
1262         usb_mtp_queue_result(s, RES_STORE_READ_ONLY,
1263                              trans, 0, 0, 0, 0);
1264         return;
1265     }
1266
1267     if (format_code != 0) {
1268         usb_mtp_queue_result(s, RES_SPEC_BY_FORMAT_UNSUPPORTED,
1269                              trans, 0, 0, 0, 0);
1270         return;
1271     }
1272
1273     if (handle == 0xFFFFFFF) {
1274         o = QTAILQ_FIRST(&s->objects);
1275     } else {
1276         o = usb_mtp_object_lookup(s, handle);
1277     }
1278     if (o == NULL) {
1279         usb_mtp_queue_result(s, RES_INVALID_OBJECT_HANDLE,
1280                              trans, 0, 0, 0, 0);
1281         return;
1282     }
1283
1284     ret = usb_mtp_deletefn(s, o, trans);
1285     if (ret == PARTIAL_DELETE) {
1286         usb_mtp_queue_result(s, RES_PARTIAL_DELETE,
1287                              trans, 0, 0, 0, 0);
1288         return;
1289     } else if (ret == READ_ONLY) {
1290         usb_mtp_queue_result(s, RES_STORE_READ_ONLY, trans,
1291                              0, 0, 0, 0);
1292         return;
1293     } else {
1294         usb_mtp_queue_result(s, RES_OK, trans,
1295                              0, 0, 0, 0);
1296         return;
1297     }
1298 }
1299
1300 static void usb_mtp_command(MTPState *s, MTPControl *c)
1301 {
1302     MTPData *data_in = NULL;
1303     MTPObject *o = NULL;
1304     uint32_t nres = 0, res0 = 0;
1305
1306     /* sanity checks */
1307     if (c->code >= CMD_CLOSE_SESSION && s->session == 0) {
1308         usb_mtp_queue_result(s, RES_SESSION_NOT_OPEN,
1309                              c->trans, 0, 0, 0, 0);
1310         return;
1311     }
1312
1313     /* process commands */
1314     switch (c->code) {
1315     case CMD_GET_DEVICE_INFO:
1316         data_in = usb_mtp_get_device_info(s, c);
1317         break;
1318     case CMD_OPEN_SESSION:
1319         if (s->session) {
1320             usb_mtp_queue_result(s, RES_SESSION_ALREADY_OPEN,
1321                                  c->trans, 1, s->session, 0, 0);
1322             return;
1323         }
1324         if (c->argv[0] == 0) {
1325             usb_mtp_queue_result(s, RES_INVALID_PARAMETER,
1326                                  c->trans, 0, 0, 0, 0);
1327             return;
1328         }
1329         trace_usb_mtp_op_open_session(s->dev.addr);
1330         s->session = c->argv[0];
1331         usb_mtp_object_alloc(s, s->next_handle++, NULL, s->root);
1332 #ifdef CONFIG_INOTIFY1
1333         if (usb_mtp_inotify_init(s)) {
1334             fprintf(stderr, "usb-mtp: file monitoring init failed\n");
1335         }
1336 #endif
1337         break;
1338     case CMD_CLOSE_SESSION:
1339         trace_usb_mtp_op_close_session(s->dev.addr);
1340         s->session = 0;
1341         s->next_handle = 0;
1342 #ifdef CONFIG_INOTIFY1
1343         usb_mtp_inotify_cleanup(s);
1344 #endif
1345         usb_mtp_object_free(s, QTAILQ_FIRST(&s->objects));
1346         assert(QTAILQ_EMPTY(&s->objects));
1347         break;
1348     case CMD_GET_STORAGE_IDS:
1349         data_in = usb_mtp_get_storage_ids(s, c);
1350         break;
1351     case CMD_GET_STORAGE_INFO:
1352         if (c->argv[0] != QEMU_STORAGE_ID &&
1353             c->argv[0] != 0xffffffff) {
1354             usb_mtp_queue_result(s, RES_INVALID_STORAGE_ID,
1355                                  c->trans, 0, 0, 0, 0);
1356             return;
1357         }
1358         data_in = usb_mtp_get_storage_info(s, c);
1359         break;
1360     case CMD_GET_NUM_OBJECTS:
1361     case CMD_GET_OBJECT_HANDLES:
1362         if (c->argv[0] != QEMU_STORAGE_ID &&
1363             c->argv[0] != 0xffffffff) {
1364             usb_mtp_queue_result(s, RES_INVALID_STORAGE_ID,
1365                                  c->trans, 0, 0, 0, 0);
1366             return;
1367         }
1368         if (c->argv[1] != 0x00000000) {
1369             usb_mtp_queue_result(s, RES_SPEC_BY_FORMAT_UNSUPPORTED,
1370                                  c->trans, 0, 0, 0, 0);
1371             return;
1372         }
1373         if (c->argv[2] == 0x00000000 ||
1374             c->argv[2] == 0xffffffff) {
1375             o = QTAILQ_FIRST(&s->objects);
1376         } else {
1377             o = usb_mtp_object_lookup(s, c->argv[2]);
1378         }
1379         if (o == NULL) {
1380             usb_mtp_queue_result(s, RES_INVALID_OBJECT_HANDLE,
1381                                  c->trans, 0, 0, 0, 0);
1382             return;
1383         }
1384         if (o->format != FMT_ASSOCIATION) {
1385             usb_mtp_queue_result(s, RES_INVALID_PARENT_OBJECT,
1386                                  c->trans, 0, 0, 0, 0);
1387             return;
1388         }
1389         usb_mtp_object_readdir(s, o);
1390         if (c->code == CMD_GET_NUM_OBJECTS) {
1391             trace_usb_mtp_op_get_num_objects(s->dev.addr, o->handle, o->path);
1392             nres = 1;
1393             res0 = o->nchildren;
1394         } else {
1395             data_in = usb_mtp_get_object_handles(s, c, o);
1396         }
1397         break;
1398     case CMD_GET_OBJECT_INFO:
1399         o = usb_mtp_object_lookup(s, c->argv[0]);
1400         if (o == NULL) {
1401             usb_mtp_queue_result(s, RES_INVALID_OBJECT_HANDLE,
1402                                  c->trans, 0, 0, 0, 0);
1403             return;
1404         }
1405         data_in = usb_mtp_get_object_info(s, c, o);
1406         break;
1407     case CMD_GET_OBJECT:
1408         o = usb_mtp_object_lookup(s, c->argv[0]);
1409         if (o == NULL) {
1410             usb_mtp_queue_result(s, RES_INVALID_OBJECT_HANDLE,
1411                                  c->trans, 0, 0, 0, 0);
1412             return;
1413         }
1414         if (o->format == FMT_ASSOCIATION) {
1415             usb_mtp_queue_result(s, RES_INVALID_OBJECT_HANDLE,
1416                                  c->trans, 0, 0, 0, 0);
1417             return;
1418         }
1419         data_in = usb_mtp_get_object(s, c, o);
1420         if (data_in == NULL) {
1421             usb_mtp_queue_result(s, RES_GENERAL_ERROR,
1422                                  c->trans, 0, 0, 0, 0);
1423             return;
1424         }
1425         break;
1426     case CMD_DELETE_OBJECT:
1427         usb_mtp_object_delete(s, c->argv[0], c->argv[1], c->trans);
1428         return;
1429     case CMD_GET_PARTIAL_OBJECT:
1430         o = usb_mtp_object_lookup(s, c->argv[0]);
1431         if (o == NULL) {
1432             usb_mtp_queue_result(s, RES_INVALID_OBJECT_HANDLE,
1433                                  c->trans, 0, 0, 0, 0);
1434             return;
1435         }
1436         if (o->format == FMT_ASSOCIATION) {
1437             usb_mtp_queue_result(s, RES_INVALID_OBJECT_HANDLE,
1438                                  c->trans, 0, 0, 0, 0);
1439             return;
1440         }
1441         data_in = usb_mtp_get_partial_object(s, c, o);
1442         if (data_in == NULL) {
1443             usb_mtp_queue_result(s, RES_GENERAL_ERROR,
1444                                  c->trans, 0, 0, 0, 0);
1445             return;
1446         }
1447         nres = 1;
1448         res0 = data_in->length;
1449         break;
1450     case CMD_SEND_OBJECT_INFO:
1451         /* Return error if store is read-only */
1452         if (!FLAG_SET(s, MTP_FLAG_WRITABLE)) {
1453             usb_mtp_queue_result(s, RES_STORE_READ_ONLY,
1454                                  c->trans, 0, 0, 0, 0);
1455         } else if (c->argv[0] && (c->argv[0] != QEMU_STORAGE_ID)) {
1456             /* First parameter points to storage id or is 0 */
1457             usb_mtp_queue_result(s, RES_STORE_NOT_AVAILABLE, c->trans,
1458                                  0, 0, 0, 0);
1459         } else if (c->argv[1] && !c->argv[0]) {
1460             /* If second parameter is specified, first must also be specified */
1461             usb_mtp_queue_result(s, RES_DESTINATION_UNSUPPORTED, c->trans,
1462                                  0, 0, 0, 0);
1463         } else {
1464             uint32_t handle = c->argv[1];
1465             if (handle == 0xFFFFFFFF || handle == 0) {
1466                 /* root object */
1467                 o = QTAILQ_FIRST(&s->objects);
1468             } else {
1469                 o = usb_mtp_object_lookup(s, handle);
1470             }
1471             if (o == NULL) {
1472                 usb_mtp_queue_result(s, RES_INVALID_OBJECT_HANDLE, c->trans,
1473                                      0, 0, 0, 0);
1474             } else if (o->format != FMT_ASSOCIATION) {
1475                 usb_mtp_queue_result(s, RES_INVALID_PARENT_OBJECT, c->trans,
1476                                      0, 0, 0, 0);
1477             }
1478         }
1479         if (o) {
1480             s->dataset.parent_handle = o->handle;
1481         }
1482         s->data_out = usb_mtp_data_alloc(c);
1483         return;
1484     case CMD_SEND_OBJECT:
1485         if (!FLAG_SET(s, MTP_FLAG_WRITABLE)) {
1486             usb_mtp_queue_result(s, RES_STORE_READ_ONLY,
1487                                  c->trans, 0, 0, 0, 0);
1488             return;
1489         }
1490         if (!s->write_pending) {
1491             usb_mtp_queue_result(s, RES_INVALID_OBJECTINFO,
1492                                  c->trans, 0, 0, 0, 0);
1493             return;
1494         }
1495         s->data_out = usb_mtp_data_alloc(c);
1496         return;
1497     case CMD_GET_OBJECT_PROPS_SUPPORTED:
1498         if (c->argv[0] != FMT_UNDEFINED_OBJECT &&
1499             c->argv[0] != FMT_ASSOCIATION) {
1500             usb_mtp_queue_result(s, RES_INVALID_OBJECT_FORMAT_CODE,
1501                                  c->trans, 0, 0, 0, 0);
1502             return;
1503         }
1504         data_in = usb_mtp_get_object_props_supported(s, c);
1505         break;
1506     case CMD_GET_OBJECT_PROP_DESC:
1507         if (c->argv[1] != FMT_UNDEFINED_OBJECT &&
1508             c->argv[1] != FMT_ASSOCIATION) {
1509             usb_mtp_queue_result(s, RES_INVALID_OBJECT_FORMAT_CODE,
1510                                  c->trans, 0, 0, 0, 0);
1511             return;
1512         }
1513         data_in = usb_mtp_get_object_prop_desc(s, c);
1514         if (data_in == NULL) {
1515             usb_mtp_queue_result(s, RES_INVALID_OBJECT_PROP_CODE,
1516                                  c->trans, 0, 0, 0, 0);
1517             return;
1518         }
1519         break;
1520     case CMD_GET_OBJECT_PROP_VALUE:
1521         o = usb_mtp_object_lookup(s, c->argv[0]);
1522         if (o == NULL) {
1523             usb_mtp_queue_result(s, RES_INVALID_OBJECT_HANDLE,
1524                                  c->trans, 0, 0, 0, 0);
1525             return;
1526         }
1527         data_in = usb_mtp_get_object_prop_value(s, c, o);
1528         if (data_in == NULL) {
1529             usb_mtp_queue_result(s, RES_INVALID_OBJECT_PROP_CODE,
1530                                  c->trans, 0, 0, 0, 0);
1531             return;
1532         }
1533         break;
1534     default:
1535         trace_usb_mtp_op_unknown(s->dev.addr, c->code);
1536         usb_mtp_queue_result(s, RES_OPERATION_NOT_SUPPORTED,
1537                              c->trans, 0, 0, 0, 0);
1538         return;
1539     }
1540
1541     /* return results on success */
1542     if (data_in) {
1543         assert(s->data_in == NULL);
1544         s->data_in = data_in;
1545     }
1546     usb_mtp_queue_result(s, RES_OK, c->trans, nres, res0, 0, 0);
1547 }
1548
1549 /* ----------------------------------------------------------------------- */
1550
1551 static void usb_mtp_handle_reset(USBDevice *dev)
1552 {
1553     MTPState *s = USB_MTP(dev);
1554
1555     trace_usb_mtp_reset(s->dev.addr);
1556
1557 #ifdef CONFIG_INOTIFY1
1558     usb_mtp_inotify_cleanup(s);
1559 #endif
1560     usb_mtp_object_free(s, QTAILQ_FIRST(&s->objects));
1561     s->session = 0;
1562     usb_mtp_data_free(s->data_in);
1563     s->data_in = NULL;
1564     usb_mtp_data_free(s->data_out);
1565     s->data_out = NULL;
1566     g_free(s->result);
1567     s->result = NULL;
1568 }
1569
1570 static void usb_mtp_handle_control(USBDevice *dev, USBPacket *p,
1571                                    int request, int value, int index,
1572                                    int length, uint8_t *data)
1573 {
1574     int ret;
1575     MTPState *s = USB_MTP(dev);
1576     uint16_t *event = (uint16_t *)data;
1577
1578     switch (request) {
1579     case ClassInterfaceOutRequest | 0x64:
1580         if (*event == EVT_CANCEL_TRANSACTION) {
1581             g_free(s->result);
1582             s->result = NULL;
1583             usb_mtp_data_free(s->data_in);
1584             s->data_in = NULL;
1585             if (s->write_pending) {
1586                 g_free(s->dataset.filename);
1587                 s->write_pending = false;
1588                 s->dataset.size = 0;
1589             }
1590             usb_mtp_data_free(s->data_out);
1591             s->data_out = NULL;
1592         } else {
1593             p->status = USB_RET_STALL;
1594         }
1595         break;
1596     default:
1597         ret = usb_desc_handle_control(dev, p, request,
1598                                       value, index, length, data);
1599         if (ret >= 0) {
1600             return;
1601         }
1602     }
1603
1604     trace_usb_mtp_stall(dev->addr, "unknown control request");
1605 }
1606
1607 static void usb_mtp_cancel_packet(USBDevice *dev, USBPacket *p)
1608 {
1609     /* we don't use async packets, so this should never be called */
1610     fprintf(stderr, "%s\n", __func__);
1611 }
1612
1613 static char *utf16_to_str(uint8_t len, uint16_t *arr)
1614 {
1615     wchar_t *wstr = g_new0(wchar_t, len + 1);
1616     int count, dlen;
1617     char *dest;
1618
1619     for (count = 0; count < len; count++) {
1620         /* FIXME: not working for surrogate pairs */
1621         wstr[count] = (wchar_t)arr[count];
1622     }
1623     wstr[count] = 0;
1624
1625     dlen = wcstombs(NULL, wstr, 0) + 1;
1626     dest = g_malloc(dlen);
1627     wcstombs(dest, wstr, dlen);
1628     g_free(wstr);
1629     return dest;
1630 }
1631
1632 /* Wrapper around write, returns 0 on failure */
1633 static uint64_t write_retry(int fd, void *buf, uint64_t size, off_t offset)
1634 {
1635         uint64_t ret = 0;
1636
1637         if (lseek(fd, offset, SEEK_SET) < 0) {
1638             goto done;
1639         }
1640
1641         ret = qemu_write_full(fd, buf, size);
1642
1643 done:
1644         return ret;
1645 }
1646
1647 static void usb_mtp_update_object(MTPObject *parent, char *name)
1648 {
1649     MTPObject *o =
1650         usb_mtp_object_lookup_name(parent, name, strlen(name));
1651
1652     if (o) {
1653         lstat(o->path, &o->stat);
1654     }
1655 }
1656
1657 static void usb_mtp_write_data(MTPState *s)
1658 {
1659     MTPData *d = s->data_out;
1660     MTPObject *parent =
1661         usb_mtp_object_lookup(s, s->dataset.parent_handle);
1662     char *path = NULL;
1663     uint64_t rc;
1664     mode_t mask = 0644;
1665
1666     assert(d != NULL);
1667
1668     switch (d->write_status) {
1669     case WRITE_START:
1670         if (!parent || !s->write_pending) {
1671             usb_mtp_queue_result(s, RES_INVALID_OBJECTINFO, d->trans,
1672                 0, 0, 0, 0);
1673         return;
1674         }
1675
1676         if (s->dataset.filename) {
1677             path = g_strdup_printf("%s/%s", parent->path, s->dataset.filename);
1678             if (s->dataset.format == FMT_ASSOCIATION) {
1679                 d->fd = mkdir(path, mask);
1680                 goto free;
1681             }
1682             d->fd = open(path, O_CREAT | O_WRONLY |
1683                          O_CLOEXEC | O_NOFOLLOW, mask);
1684             if (d->fd == -1) {
1685                 usb_mtp_queue_result(s, RES_STORE_FULL, d->trans,
1686                                      0, 0, 0, 0);
1687                 goto done;
1688             }
1689
1690             /* Return success if initiator sent 0 sized data */
1691             if (!s->dataset.size) {
1692                 goto success;
1693             }
1694             if (d->length != MTP_WRITE_BUF_SZ && !d->pending) {
1695                 d->write_status = WRITE_END;
1696             }
1697         }
1698         /* fall through */
1699     case WRITE_CONTINUE:
1700     case WRITE_END:
1701         rc = write_retry(d->fd, d->data, d->data_offset,
1702                          d->offset - d->data_offset);
1703         if (rc != d->data_offset) {
1704             usb_mtp_queue_result(s, RES_STORE_FULL, d->trans,
1705                                  0, 0, 0, 0);
1706             goto done;
1707         }
1708         if (d->write_status != WRITE_END) {
1709             return;
1710         } else {
1711             /* Only for < 4G file sizes */
1712             if (s->dataset.size != 0xFFFFFFFF && d->offset != s->dataset.size) {
1713                 usb_mtp_queue_result(s, RES_INCOMPLETE_TRANSFER, d->trans,
1714                                      0, 0, 0, 0);
1715                 goto done;
1716             }
1717             usb_mtp_update_object(parent, s->dataset.filename);
1718         }
1719     }
1720
1721 success:
1722     usb_mtp_queue_result(s, RES_OK, d->trans,
1723                          0, 0, 0, 0);
1724
1725 done:
1726     /*
1727      * The write dataset is kept around and freed only
1728      * on success or if another write request comes in
1729      */
1730     if (d->fd != -1) {
1731         close(d->fd);
1732     }
1733 free:
1734     g_free(s->dataset.filename);
1735     s->dataset.size = 0;
1736     g_free(path);
1737     s->write_pending = false;
1738 }
1739
1740 static void usb_mtp_write_metadata(MTPState *s, uint64_t dlen)
1741 {
1742     MTPData *d = s->data_out;
1743     ObjectInfo *dataset = (ObjectInfo *)d->data;
1744     char *filename;
1745     MTPObject *o;
1746     MTPObject *p = usb_mtp_object_lookup(s, s->dataset.parent_handle);
1747     uint32_t next_handle = s->next_handle;
1748
1749     assert(!s->write_pending);
1750     assert(p != NULL);
1751
1752     filename = utf16_to_str(MIN(dataset->length,
1753                                 dlen - offsetof(ObjectInfo, filename)),
1754                             dataset->filename);
1755
1756     if (strchr(filename, '/')) {
1757         usb_mtp_queue_result(s, RES_PARAMETER_NOT_SUPPORTED, d->trans,
1758                              0, 0, 0, 0);
1759         g_free(filename);
1760         return;
1761     }
1762
1763     o = usb_mtp_object_lookup_name(p, filename, dataset->length);
1764     if (o != NULL) {
1765         next_handle = o->handle;
1766     }
1767
1768     s->dataset.filename = filename;
1769     s->dataset.format = dataset->format;
1770     s->dataset.size = dataset->size;
1771     s->write_pending = true;
1772
1773     if (s->dataset.format == FMT_ASSOCIATION) {
1774         usb_mtp_write_data(s);
1775         /* next_handle will be allocated to the newly created dir */
1776         if (d->fd == -1) {
1777             usb_mtp_queue_result(s, RES_STORE_FULL, d->trans,
1778                                  0, 0, 0, 0);
1779             return;
1780         }
1781         d->fd = -1;
1782     }
1783
1784     usb_mtp_queue_result(s, RES_OK, d->trans, 3, QEMU_STORAGE_ID,
1785                          s->dataset.parent_handle, next_handle);
1786 }
1787
1788 static void usb_mtp_get_data(MTPState *s, mtp_container *container,
1789                              USBPacket *p)
1790 {
1791     MTPData *d = s->data_out;
1792     uint64_t dlen;
1793     uint32_t data_len = p->iov.size;
1794     uint64_t total_len;
1795
1796     if (!d) {
1797             usb_mtp_queue_result(s, RES_INVALID_OBJECTINFO, 0,
1798                                  0, 0, 0, 0);
1799             return;
1800     }
1801     if (d->first) {
1802         /* Total length of incoming data */
1803         total_len = cpu_to_le32(container->length) - sizeof(mtp_container);
1804         /* Length of data in this packet */
1805         data_len -= sizeof(mtp_container);
1806         if (total_len < MTP_WRITE_BUF_SZ) {
1807                 usb_mtp_realloc(d, total_len);
1808                 d->length += total_len;
1809         } else {
1810                 usb_mtp_realloc(d, MTP_WRITE_BUF_SZ - sizeof(mtp_container));
1811                 d->length += MTP_WRITE_BUF_SZ - sizeof(mtp_container);
1812         }
1813         d->offset = 0;
1814         d->first = false;
1815         d->pending = false;
1816         d->data_offset = 0;
1817         d->write_status = WRITE_START;
1818     }
1819
1820     if (d->pending) {
1821         memset(d->data, 0, d->length);
1822         if (d->length != MTP_WRITE_BUF_SZ) {
1823             usb_mtp_realloc(d, MTP_WRITE_BUF_SZ - d->length);
1824             d->length += (MTP_WRITE_BUF_SZ - d->length);
1825         }
1826         d->pending = false;
1827         d->write_status = WRITE_CONTINUE;
1828         d->data_offset = 0;
1829     }
1830
1831     if (d->length - d->data_offset > data_len) {
1832         dlen = data_len;
1833     } else {
1834         dlen = d->length - d->data_offset;
1835     }
1836
1837     switch (d->code) {
1838     case CMD_SEND_OBJECT_INFO:
1839         usb_packet_copy(p, d->data + d->data_offset, dlen);
1840         d->offset += dlen;
1841         d->data_offset += dlen;
1842         if (d->data_offset == d->length) {
1843             /* The operation might have already failed */
1844             if (!s->result) {
1845                 usb_mtp_write_metadata(s, dlen);
1846             }
1847             usb_mtp_data_free(s->data_out);
1848             s->data_out = NULL;
1849             return;
1850         }
1851         break;
1852     case CMD_SEND_OBJECT:
1853         usb_packet_copy(p, d->data + d->data_offset, dlen);
1854         d->offset += dlen;
1855         d->data_offset += dlen;
1856         if ((p->iov.size % 64) || !p->iov.size) {
1857             assert((s->dataset.size == 0xFFFFFFFF) ||
1858                    (s->dataset.size == d->offset));
1859
1860             if (d->length == MTP_WRITE_BUF_SZ) {
1861                 d->write_status = WRITE_END;
1862             } else {
1863                 d->write_status = WRITE_START;
1864             }
1865             usb_mtp_write_data(s);
1866             usb_mtp_data_free(s->data_out);
1867             s->data_out = NULL;
1868             return;
1869         }
1870         if (d->data_offset == d->length) {
1871             d->pending = true;
1872             usb_mtp_write_data(s);
1873         }
1874         break;
1875     default:
1876         p->status = USB_RET_STALL;
1877         return;
1878     }
1879 }
1880
1881 static void usb_mtp_handle_data(USBDevice *dev, USBPacket *p)
1882 {
1883     MTPState *s = USB_MTP(dev);
1884     MTPControl cmd;
1885     mtp_container container;
1886     uint32_t params[5];
1887     uint16_t container_type;
1888     int i, rc;
1889
1890     switch (p->ep->nr) {
1891     case EP_DATA_IN:
1892         if (s->data_out != NULL) {
1893             /* guest bug */
1894             trace_usb_mtp_stall(s->dev.addr, "awaiting data-out");
1895             p->status = USB_RET_STALL;
1896             return;
1897         }
1898         if (p->iov.size < sizeof(container)) {
1899             trace_usb_mtp_stall(s->dev.addr, "packet too small");
1900             p->status = USB_RET_STALL;
1901             return;
1902         }
1903         if (s->data_in !=  NULL) {
1904             MTPData *d = s->data_in;
1905             uint64_t dlen = d->length - d->offset;
1906             if (d->first) {
1907                 trace_usb_mtp_data_in(s->dev.addr, d->trans, d->length);
1908                 if (d->length + sizeof(container) > 0xFFFFFFFF) {
1909                     container.length = cpu_to_le32(0xFFFFFFFF);
1910                 } else {
1911                     container.length =
1912                         cpu_to_le32(d->length + sizeof(container));
1913                 }
1914                 container.type   = cpu_to_le16(TYPE_DATA);
1915                 container.code   = cpu_to_le16(d->code);
1916                 container.trans  = cpu_to_le32(d->trans);
1917                 usb_packet_copy(p, &container, sizeof(container));
1918                 d->first = false;
1919                 if (dlen > p->iov.size - sizeof(container)) {
1920                     dlen = p->iov.size - sizeof(container);
1921                 }
1922             } else {
1923                 if (dlen > p->iov.size) {
1924                     dlen = p->iov.size;
1925                 }
1926             }
1927             if (d->fd == -1) {
1928                 usb_packet_copy(p, d->data + d->offset, dlen);
1929             } else {
1930                 if (d->alloc < p->iov.size) {
1931                     d->alloc = p->iov.size;
1932                     d->data = g_realloc(d->data, d->alloc);
1933                 }
1934                 rc = read(d->fd, d->data, dlen);
1935                 if (rc != dlen) {
1936                     memset(d->data, 0, dlen);
1937                     s->result->code = RES_INCOMPLETE_TRANSFER;
1938                 }
1939                 usb_packet_copy(p, d->data, dlen);
1940             }
1941             d->offset += dlen;
1942             if (d->offset == d->length) {
1943                 usb_mtp_data_free(s->data_in);
1944                 s->data_in = NULL;
1945             }
1946         } else if (s->result != NULL) {
1947             MTPControl *r = s->result;
1948             int length = sizeof(container) + r->argc * sizeof(uint32_t);
1949             if (r->code == RES_OK) {
1950                 trace_usb_mtp_success(s->dev.addr, r->trans,
1951                                       (r->argc > 0) ? r->argv[0] : 0,
1952                                       (r->argc > 1) ? r->argv[1] : 0);
1953             } else {
1954                 trace_usb_mtp_error(s->dev.addr, r->code, r->trans,
1955                                     (r->argc > 0) ? r->argv[0] : 0,
1956                                     (r->argc > 1) ? r->argv[1] : 0);
1957             }
1958             container.length = cpu_to_le32(length);
1959             container.type   = cpu_to_le16(TYPE_RESPONSE);
1960             container.code   = cpu_to_le16(r->code);
1961             container.trans  = cpu_to_le32(r->trans);
1962             for (i = 0; i < r->argc; i++) {
1963                 params[i] = cpu_to_le32(r->argv[i]);
1964             }
1965             usb_packet_copy(p, &container, sizeof(container));
1966             usb_packet_copy(p, &params, length - sizeof(container));
1967             g_free(s->result);
1968             s->result = NULL;
1969         }
1970         break;
1971     case EP_DATA_OUT:
1972         if (p->iov.size < sizeof(container)) {
1973             trace_usb_mtp_stall(s->dev.addr, "packet too small");
1974             p->status = USB_RET_STALL;
1975             return;
1976         }
1977         if ((s->data_out != NULL) && !s->data_out->first) {
1978             container_type = TYPE_DATA;
1979         } else {
1980             usb_packet_copy(p, &container, sizeof(container));
1981             container_type = le16_to_cpu(container.type);
1982         }
1983         switch (container_type) {
1984         case TYPE_COMMAND:
1985             if (s->data_in || s->data_out || s->result) {
1986                 trace_usb_mtp_stall(s->dev.addr, "transaction inflight");
1987                 p->status = USB_RET_STALL;
1988                 return;
1989             }
1990             cmd.code = le16_to_cpu(container.code);
1991             cmd.argc = (le32_to_cpu(container.length) - sizeof(container))
1992                 / sizeof(uint32_t);
1993             cmd.trans = le32_to_cpu(container.trans);
1994             if (cmd.argc > ARRAY_SIZE(cmd.argv)) {
1995                 cmd.argc = ARRAY_SIZE(cmd.argv);
1996             }
1997             if (p->iov.size < sizeof(container) + cmd.argc * sizeof(uint32_t)) {
1998                 trace_usb_mtp_stall(s->dev.addr, "packet too small");
1999                 p->status = USB_RET_STALL;
2000                 return;
2001             }
2002             usb_packet_copy(p, &params, cmd.argc * sizeof(uint32_t));
2003             for (i = 0; i < cmd.argc; i++) {
2004                 cmd.argv[i] = le32_to_cpu(params[i]);
2005             }
2006             trace_usb_mtp_command(s->dev.addr, cmd.code, cmd.trans,
2007                                   (cmd.argc > 0) ? cmd.argv[0] : 0,
2008                                   (cmd.argc > 1) ? cmd.argv[1] : 0,
2009                                   (cmd.argc > 2) ? cmd.argv[2] : 0,
2010                                   (cmd.argc > 3) ? cmd.argv[3] : 0,
2011                                   (cmd.argc > 4) ? cmd.argv[4] : 0);
2012             usb_mtp_command(s, &cmd);
2013             break;
2014         case TYPE_DATA:
2015             /* One of the previous transfers has already errored but the
2016              * responder is still sending data associated with it
2017              */
2018             if (s->result != NULL) {
2019                 return;
2020             }
2021             usb_mtp_get_data(s, &container, p);
2022             break;
2023         default:
2024             /* not needed as long as the mtp device is read-only */
2025             p->status = USB_RET_STALL;
2026             return;
2027         }
2028         break;
2029     case EP_EVENT:
2030 #ifdef CONFIG_INOTIFY1
2031         if (!QTAILQ_EMPTY(&s->events)) {
2032             struct MTPMonEntry *e = QTAILQ_LAST(&s->events);
2033             uint32_t handle;
2034             int len = sizeof(container) + sizeof(uint32_t);
2035
2036             if (p->iov.size < len) {
2037                 trace_usb_mtp_stall(s->dev.addr,
2038                                     "packet too small to send event");
2039                 p->status = USB_RET_STALL;
2040                 return;
2041             }
2042
2043             QTAILQ_REMOVE(&s->events, e, next);
2044             container.length = cpu_to_le32(len);
2045             container.type = cpu_to_le32(TYPE_EVENT);
2046             container.code = cpu_to_le16(e->event);
2047             container.trans = 0; /* no trans specific events */
2048             handle = cpu_to_le32(e->handle);
2049             usb_packet_copy(p, &container, sizeof(container));
2050             usb_packet_copy(p, &handle, sizeof(uint32_t));
2051             g_free(e);
2052             return;
2053         }
2054 #endif
2055         p->status = USB_RET_NAK;
2056         return;
2057     default:
2058         trace_usb_mtp_stall(s->dev.addr, "invalid endpoint");
2059         p->status = USB_RET_STALL;
2060         return;
2061     }
2062
2063     if (p->actual_length == 0) {
2064         trace_usb_mtp_nak(s->dev.addr, p->ep->nr);
2065         p->status = USB_RET_NAK;
2066         return;
2067     } else {
2068         trace_usb_mtp_xfer(s->dev.addr, p->ep->nr, p->actual_length,
2069                            p->iov.size);
2070         return;
2071     }
2072 }
2073
2074 static void usb_mtp_realize(USBDevice *dev, Error **errp)
2075 {
2076     MTPState *s = USB_MTP(dev);
2077
2078     usb_desc_create_serial(dev);
2079     usb_desc_init(dev);
2080     QTAILQ_INIT(&s->objects);
2081     if (s->desc == NULL) {
2082         if (s->root == NULL) {
2083             error_setg(errp, "usb-mtp: rootdir property must be configured");
2084             return;
2085         }
2086         s->desc = strrchr(s->root, '/');
2087         if (s->desc && s->desc[0]) {
2088             s->desc = g_strdup(s->desc + 1);
2089         } else {
2090             s->desc = g_strdup("none");
2091         }
2092     }
2093     /* Mark store as RW */
2094     if (!s->readonly) {
2095         s->flags |= (1 << MTP_FLAG_WRITABLE);
2096     }
2097
2098 }
2099
2100 static const VMStateDescription vmstate_usb_mtp = {
2101     .name = "usb-mtp",
2102     .unmigratable = 1,
2103     .version_id = 1,
2104     .minimum_version_id = 1,
2105     .fields = (VMStateField[]) {
2106         VMSTATE_USB_DEVICE(dev, MTPState),
2107         VMSTATE_END_OF_LIST()
2108     }
2109 };
2110
2111 static Property mtp_properties[] = {
2112     DEFINE_PROP_STRING("rootdir", MTPState, root),
2113     DEFINE_PROP_STRING("desc", MTPState, desc),
2114     DEFINE_PROP_BOOL("readonly", MTPState, readonly, true),
2115     DEFINE_PROP_END_OF_LIST(),
2116 };
2117
2118 static void usb_mtp_class_initfn(ObjectClass *klass, void *data)
2119 {
2120     DeviceClass *dc = DEVICE_CLASS(klass);
2121     USBDeviceClass *uc = USB_DEVICE_CLASS(klass);
2122
2123     uc->realize        = usb_mtp_realize;
2124     uc->product_desc   = "QEMU USB MTP";
2125     uc->usb_desc       = &desc;
2126     uc->cancel_packet  = usb_mtp_cancel_packet;
2127     uc->handle_attach  = usb_desc_attach;
2128     uc->handle_reset   = usb_mtp_handle_reset;
2129     uc->handle_control = usb_mtp_handle_control;
2130     uc->handle_data    = usb_mtp_handle_data;
2131     set_bit(DEVICE_CATEGORY_STORAGE, dc->categories);
2132     dc->desc = "USB Media Transfer Protocol device";
2133     dc->fw_name = "mtp";
2134     dc->vmsd = &vmstate_usb_mtp;
2135     dc->props = mtp_properties;
2136 }
2137
2138 static TypeInfo mtp_info = {
2139     .name          = TYPE_USB_MTP,
2140     .parent        = TYPE_USB_DEVICE,
2141     .instance_size = sizeof(MTPState),
2142     .class_init    = usb_mtp_class_initfn,
2143 };
2144
2145 static void usb_mtp_register_types(void)
2146 {
2147     type_register_static(&mtp_info);
2148 }
2149
2150 type_init(usb_mtp_register_types)