server/device.c

   1 /*
   2  * Server-side device support
   3  *
   4  * Copyright (C) 2007 Alexandre Julliard
   5  *
   6  * This library is free software; you can redistribute it and/or
   7  * modify it under the terms of the GNU Lesser General Public
   8  * License as published by the Free Software Foundation; either
   9  * version 2.1 of the License, or (at your option) any later version.
  10  *
  11  * This library is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14  * Lesser General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU Lesser General Public
  17  * License along with this library; if not, write to the Free Software
  18  * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301, USA
  19  */
  20
  21 #include "config.h"
  22 #include "wine/port.h"
  23
  24 #include <assert.h>
  25 #include <fcntl.h>
  26 #include <stdio.h>
  27 #include <stdlib.h>
  28 #include <stdarg.h>
  29
  30 #include "ntstatus.h"
  31 #define WIN32_NO_STATUS
  32 #include "windef.h"
  33 #include "winternl.h"
  34 #include "ddk/wdm.h"
  35
  36 #include "object.h"
  37 #include "file.h"
  38 #include "handle.h"
  39 #include "request.h"
  40 #include "process.h"
  41
  42 /* IRP object */
  43
  44 struct irp_call
  45 {
  46     struct object          obj;           /* object header */
  47     struct list            dev_entry;     /* entry in device queue */
  48     struct list            mgr_entry;     /* entry in manager queue */
  49     struct device_file    *file;          /* file containing this irp */
  50     struct thread         *thread;        /* thread that queued the irp */
  51     client_ptr_t           user_arg;      /* user arg used to identify the request */
  52     struct async          *async;         /* pending async op */
  53     unsigned int           status;        /* resulting status (or STATUS_PENDING) */
  54     irp_params_t           params;        /* irp parameters */
  55     data_size_t            result;        /* size of result (input or output depending on the type) */
  56     data_size_t            in_size;       /* size of input data */
  57     void                  *in_data;       /* input data */
  58     data_size_t            out_size;      /* size of output data */
  59     void                  *out_data;      /* output data */
  60 };
  61
  62 static void irp_call_dump( struct object *obj, int verbose );
  63 static int irp_call_signaled( struct object *obj, struct wait_queue_entry *entry );
  64 static void irp_call_destroy( struct object *obj );
  65
  66 static const struct object_ops irp_call_ops =
  67 {
  68     sizeof(struct irp_call),          /* size */
  69     irp_call_dump,                    /* dump */
  70     no_get_type,                      /* get_type */
  71     add_queue,                        /* add_queue */
  72     remove_queue,                     /* remove_queue */
  73     irp_call_signaled,                /* signaled */
  74     no_satisfied,                     /* satisfied */
  75     no_signal,                        /* signal */
  76     no_get_fd,                        /* get_fd */
  77     no_map_access,                    /* map_access */
  78     default_get_sd,                   /* get_sd */
  79     default_set_sd,                   /* set_sd */
  80     no_lookup_name,                   /* lookup_name */
  81     no_open_file,                     /* open_file */
  82     no_close_handle,                  /* close_handle */
  83     irp_call_destroy                  /* destroy */
  84 };
  85
  86
  87 /* device manager (a list of devices managed by the same client process) */
  88
  89 struct device_manager
  90 {
  91     struct object          obj;           /* object header */
  92     struct list            devices;       /* list of devices */
  93     struct list            requests;      /* list of pending irps across all devices */
  94 };
  95
  96 static void device_manager_dump( struct object *obj, int verbose );
  97 static int device_manager_signaled( struct object *obj, struct wait_queue_entry *entry );
  98 static void device_manager_destroy( struct object *obj );
  99
 100 static const struct object_ops device_manager_ops =
 101 {
 102     sizeof(struct device_manager),    /* size */
 103     device_manager_dump,              /* dump */
 104     no_get_type,                      /* get_type */
 105     add_queue,                        /* add_queue */
 106     remove_queue,                     /* remove_queue */
 107     device_manager_signaled,          /* signaled */
 108     no_satisfied,                     /* satisfied */
 109     no_signal,                        /* signal */
 110     no_get_fd,                        /* get_fd */
 111     no_map_access,                    /* map_access */
 112     default_get_sd,                   /* get_sd */
 113     default_set_sd,                   /* set_sd */
 114     no_lookup_name,                   /* lookup_name */
 115     no_open_file,                     /* open_file */
 116     no_close_handle,                  /* close_handle */
 117     device_manager_destroy            /* destroy */
 118 };
 119
 120
 121 /* device (a single device object) */
 122
 123 struct device
 124 {
 125     struct object          obj;           /* object header */
 126     struct device_manager *manager;       /* manager for this device (or NULL if deleted) */
 127     char                  *unix_path;     /* path to unix device if any */
 128     client_ptr_t           user_ptr;      /* opaque ptr for client side */
 129     struct list            entry;         /* entry in device manager list */
 130     struct list            files;         /* list of open files */
 131 };
 132
 133 static void device_dump( struct object *obj, int verbose );
 134 static struct object_type *device_get_type( struct object *obj );
 135 static void device_destroy( struct object *obj );
 136 static struct object *device_open_file( struct object *obj, unsigned int access,
 137                                         unsigned int sharing, unsigned int options );
 138
 139 static const struct object_ops device_ops =
 140 {
 141     sizeof(struct device),            /* size */
 142     device_dump,                      /* dump */
 143     device_get_type,                  /* get_type */
 144     no_add_queue,                     /* add_queue */
 145     NULL,                             /* remove_queue */
 146     NULL,                             /* signaled */
 147     no_satisfied,                     /* satisfied */
 148     no_signal,                        /* signal */
 149     no_get_fd,                        /* get_fd */
 150     default_fd_map_access,            /* map_access */
 151     default_get_sd,                   /* get_sd */
 152     default_set_sd,                   /* set_sd */
 153     no_lookup_name,                   /* lookup_name */
 154     device_open_file,                 /* open_file */
 155     no_close_handle,                  /* close_handle */
 156     device_destroy                    /* destroy */
 157 };
 158
 159
 160 /* device file (an open file handle to a device) */
 161
 162 struct device_file
 163 {
 164     struct object          obj;           /* object header */
 165     struct device         *device;        /* device for this file */
 166     struct fd             *fd;            /* file descriptor for irp */
 167     struct list            entry;         /* entry in device list */
 168     struct list            requests;      /* list of pending irp requests */
 169 };
 170
 171 static void device_file_dump( struct object *obj, int verbose );
 172 static struct fd *device_file_get_fd( struct object *obj );
 173 static int device_file_close_handle( struct object *obj, struct process *process, obj_handle_t handle );
 174 static void device_file_destroy( struct object *obj );
 175 static enum server_fd_type device_file_get_fd_type( struct fd *fd );
 176 static obj_handle_t device_file_read( struct fd *fd, const async_data_t *async_data, int blocking,
 177                                       file_pos_t pos );
 178 static obj_handle_t device_file_write( struct fd *fd, const async_data_t *async_data, int blocking,
 179                                        file_pos_t pos, data_size_t *written );
 180 static obj_handle_t device_file_flush( struct fd *fd, const async_data_t *async_data, int blocking );
 181 static obj_handle_t device_file_ioctl( struct fd *fd, ioctl_code_t code, const async_data_t *async_data,
 182                                        int blocking );
 183
 184 static const struct object_ops device_file_ops =
 185 {
 186     sizeof(struct device_file),       /* size */
 187     device_file_dump,                 /* dump */
 188     no_get_type,                      /* get_type */
 189     add_queue,                        /* add_queue */
 190     remove_queue,                     /* remove_queue */
 191     default_fd_signaled,              /* signaled */
 192     no_satisfied,                     /* satisfied */
 193     no_signal,                        /* signal */
 194     device_file_get_fd,               /* get_fd */
 195     default_fd_map_access,            /* map_access */
 196     default_get_sd,                   /* get_sd */
 197     default_set_sd,                   /* set_sd */
 198     no_lookup_name,                   /* lookup_name */
 199     no_open_file,                     /* open_file */
 200     device_file_close_handle,         /* close_handle */
 201     device_file_destroy               /* destroy */
 202 };
 203
 204 static const struct fd_ops device_file_fd_ops =
 205 {
 206     default_fd_get_poll_events,       /* get_poll_events */
 207     default_poll_event,               /* poll_event */
 208     device_file_get_fd_type,          /* get_fd_type */
 209     device_file_read,                 /* read */
 210     device_file_write,                /* write */
 211     device_file_flush,                /* flush */
 212     device_file_ioctl,                /* ioctl */
 213     default_fd_queue_async,           /* queue_async */
 214     default_fd_reselect_async,        /* reselect_async */
 215     default_fd_cancel_async           /* cancel_async */
 216 };
 217
 218
 219 static void irp_call_dump( struct object *obj, int verbose )
 220 {
 221     struct irp_call *irp = (struct irp_call *)obj;
 222     fprintf( stderr, "IRP call file=%p\n", irp->file );
 223 }
 224
 225 static int irp_call_signaled( struct object *obj, struct wait_queue_entry *entry )
 226 {
 227     struct irp_call *irp = (struct irp_call *)obj;
 228
 229     return !irp->file;  /* file is cleared once the irp has completed */
 230 }
 231
 232 static void irp_call_destroy( struct object *obj )
 233 {
 234     struct irp_call *irp = (struct irp_call *)obj;
 235
 236     free( irp->in_data );
 237     free( irp->out_data );
 238     if (irp->async)
 239     {
 240         async_terminate( irp->async, STATUS_CANCELLED );
 241         release_object( irp->async );
 242     }
 243     if (irp->file) release_object( irp->file );
 244     release_object( irp->thread );
 245 }
 246
 247 static struct irp_call *create_irp( struct device_file *file, const irp_params_t *params,
 248                                     const void *in_data, data_size_t in_size, data_size_t out_size )
 249 {
 250     struct irp_call *irp;
 251
 252     if (!file->device->manager)  /* it has been deleted */
 253     {
 254         set_error( STATUS_FILE_DELETED );
 255         return NULL;
 256     }
 257
 258     if ((irp = alloc_object( &irp_call_ops )))
 259     {
 260         irp->file     = (struct device_file *)grab_object( file );
 261         irp->async    = NULL;
 262         irp->params   = *params;
 263         irp->status   = STATUS_PENDING;
 264         irp->result   = 0;
 265         irp->in_size  = in_size;
 266         irp->in_data  = NULL;
 267         irp->out_size = out_size;
 268         irp->out_data = NULL;
 269
 270         if (irp->in_size && !(irp->in_data = memdup( in_data, in_size )))
 271         {
 272             release_object( irp );
 273             irp = NULL;
 274         }
 275     }
 276     return irp;
 277 }
 278
 279 static void set_irp_result( struct irp_call *irp, unsigned int status,
 280                             const void *out_data, data_size_t out_size, data_size_t result )
 281 {
 282     struct device_file *file = irp->file;
 283
 284     if (!file) return;  /* already finished */
 285
 286     /* FIXME: handle the STATUS_PENDING case */
 287     irp->status = status;
 288     irp->result = result;
 289     irp->out_size = min( irp->out_size, out_size );
 290     if (irp->out_size && !(irp->out_data = memdup( out_data, irp->out_size )))
 291         irp->out_size = 0;
 292     irp->file = NULL;
 293     if (irp->async)
 294     {
 295         if (result) status = STATUS_ALERTED;
 296         async_terminate( irp->async, status );
 297         release_object( irp->async );
 298         irp->async = NULL;
 299     }
 300     wake_up( &irp->obj, 0 );
 301
 302     if (status != STATUS_ALERTED)
 303     {
 304         /* remove it from the device queue */
 305         /* (for STATUS_ALERTED this will be done in get_irp_result) */
 306         list_remove( &irp->dev_entry );
 307         release_object( irp );  /* no longer on the device queue */
 308     }
 309     release_object( file );
 310 }
 311
 312
 313 static void device_dump( struct object *obj, int verbose )
 314 {
 315     struct device *device = (struct device *)obj;
 316
 317     fprintf( stderr, "Device " );
 318     dump_object_name( &device->obj );
 319     fputc( '\n', stderr );
 320 }
 321
 322 static struct object_type *device_get_type( struct object *obj )
 323 {
 324     static const WCHAR name[] = {'D','e','v','i','c','e'};
 325     static const struct unicode_str str = { name, sizeof(name) };
 326     return get_object_type( &str );
 327 }
 328
 329 static void device_destroy( struct object *obj )
 330 {
 331     struct device *device = (struct device *)obj;
 332
 333     assert( list_empty( &device->files ));
 334
 335     free( device->unix_path );
 336     if (device->manager) list_remove( &device->entry );
 337 }
 338
 339 static void add_irp_to_queue( struct device_file *file, struct irp_call *irp )
 340 {
 341     struct device_manager *manager = file->device->manager;
 342
 343     assert( manager );
 344
 345     grab_object( irp );  /* grab reference for queued irp */
 346     irp->thread = (struct thread *)grab_object( current );
 347     list_add_tail( &file->requests, &irp->dev_entry );
 348     list_add_tail( &manager->requests, &irp->mgr_entry );
 349     if (list_head( &manager->requests ) == &irp->mgr_entry) wake_up( &manager->obj, 0 );  /* first one */
 350 }
 351
 352 static struct object *device_open_file( struct object *obj, unsigned int access,
 353                                         unsigned int sharing, unsigned int options )
 354 {
 355     struct device *device = (struct device *)obj;
 356     struct device_file *file;
 357
 358     if (!(file = alloc_object( &device_file_ops ))) return NULL;
 359
 360     file->device = (struct device *)grab_object( device );
 361     list_init( &file->requests );
 362     list_add_tail( &device->files, &file->entry );
 363     if (device->unix_path)
 364     {
 365         mode_t mode = 0666;
 366         access = file->obj.ops->map_access( &file->obj, access );
 367         file->fd = open_fd( NULL, device->unix_path, O_NONBLOCK | O_LARGEFILE,
 368                             &mode, access, sharing, options );
 369         if (file->fd) set_fd_user( file->fd, &device_file_fd_ops, &file->obj );
 370     }
 371     else file->fd = alloc_pseudo_fd( &device_file_fd_ops, &file->obj, 0 );
 372
 373     if (!file->fd)
 374     {
 375         release_object( file );
 376         return NULL;
 377     }
 378
 379     if (device->manager)
 380     {
 381         struct irp_call *irp;
 382         irp_params_t params;
 383
 384         params.create.major   = IRP_MJ_CREATE;
 385         params.create.access  = access;
 386         params.create.sharing = sharing;
 387         params.create.options = options;
 388         params.create.device  = file->device->user_ptr;
 389
 390         if ((irp = create_irp( file, &params, NULL, 0, 0 )))
 391         {
 392             add_irp_to_queue( file, irp );
 393             release_object( irp );
 394         }
 395     }
 396     return &file->obj;
 397 }
 398
 399 static void device_file_dump( struct object *obj, int verbose )
 400 {
 401     struct device_file *file = (struct device_file *)obj;
 402
 403     fprintf( stderr, "File on device %p\n", file->device );
 404 }
 405
 406 static struct fd *device_file_get_fd( struct object *obj )
 407 {
 408     struct device_file *file = (struct device_file *)obj;
 409
 410     return (struct fd *)grab_object( file->fd );
 411 }
 412
 413 static int device_file_close_handle( struct object *obj, struct process *process, obj_handle_t handle )
 414 {
 415     struct device_file *file = (struct device_file *)obj;
 416
 417     if (file->device->manager && obj->handle_count == 1)  /* last handle */
 418     {
 419         struct irp_call *irp;
 420         irp_params_t params;
 421
 422         params.close.major  = IRP_MJ_CLOSE;
 423         params.close.device = file->device->user_ptr;
 424
 425         if ((irp = create_irp( file, &params, NULL, 0, 0 )))
 426         {
 427             add_irp_to_queue( file, irp );
 428             release_object( irp );
 429         }
 430     }
 431     return 1;
 432 }
 433
 434 static void device_file_destroy( struct object *obj )
 435 {
 436     struct device_file *file = (struct device_file *)obj;
 437     struct irp_call *irp, *next;
 438
 439     LIST_FOR_EACH_ENTRY_SAFE( irp, next, &file->requests, struct irp_call, dev_entry )
 440     {
 441         list_remove( &irp->dev_entry );
 442         release_object( irp );  /* no longer on the device queue */
 443     }
 444     if (file->fd) release_object( file->fd );
 445     list_remove( &file->entry );
 446     release_object( file->device );
 447 }
 448
 449 static struct irp_call *find_irp_call( struct device_file *file, struct thread *thread,
 450                                        client_ptr_t user_arg )
 451 {
 452     struct irp_call *irp;
 453
 454     LIST_FOR_EACH_ENTRY( irp, &file->requests, struct irp_call, dev_entry )
 455         if (irp->thread == thread && irp->user_arg == user_arg) return irp;
 456
 457     set_error( STATUS_INVALID_PARAMETER );
 458     return NULL;
 459 }
 460
 461 /* queue an irp to the device */
 462 static obj_handle_t queue_irp( struct device_file *file, struct irp_call *irp,
 463                                const async_data_t *async_data, int blocking )
 464 {
 465     obj_handle_t handle = 0;
 466
 467     if (blocking && !(handle = alloc_handle( current->process, irp, SYNCHRONIZE, 0 ))) return 0;
 468
 469     if (!(irp->async = fd_queue_async( file->fd, async_data, ASYNC_TYPE_WAIT )))
 470     {
 471         if (handle) close_handle( current->process, handle );
 472         return 0;
 473     }
 474     irp->user_arg = async_data->arg;
 475     add_irp_to_queue( file, irp );
 476     set_error( STATUS_PENDING );
 477     return handle;
 478 }
 479
 480 static enum server_fd_type device_file_get_fd_type( struct fd *fd )
 481 {
 482     return FD_TYPE_DEVICE;
 483 }
 484
 485 static obj_handle_t device_file_read( struct fd *fd, const async_data_t *async_data, int blocking,
 486                                       file_pos_t pos )
 487 {
 488     struct device_file *file = get_fd_user( fd );
 489     struct irp_call *irp;
 490     obj_handle_t handle;
 491     irp_params_t params;
 492
 493     params.read.major  = IRP_MJ_READ;
 494     params.read.key    = 0;
 495     params.read.pos    = pos;
 496     params.read.device = file->device->user_ptr;
 497
 498     irp = create_irp( file, &params, NULL, 0, get_reply_max_size() );
 499     if (!irp) return 0;
 500
 501     handle = queue_irp( file, irp, async_data, blocking );
 502     release_object( irp );
 503     return handle;
 504 }
 505
 506 static obj_handle_t device_file_write( struct fd *fd, const async_data_t *async_data, int blocking,
 507                                        file_pos_t pos, data_size_t *written )
 508 {
 509     struct device_file *file = get_fd_user( fd );
 510     struct irp_call *irp;
 511     obj_handle_t handle;
 512     irp_params_t params;
 513
 514     params.write.major  = IRP_MJ_WRITE;
 515     params.write.key    = 0;
 516     params.write.pos    = pos;
 517     params.write.device = file->device->user_ptr;
 518
 519     irp = create_irp( file, &params, get_req_data(), get_req_data_size(), 0 );
 520     if (!irp) return 0;
 521
 522     handle = queue_irp( file, irp, async_data, blocking );
 523     release_object( irp );
 524     return handle;
 525 }
 526
 527 static obj_handle_t device_file_flush( struct fd *fd, const async_data_t *async_data, int blocking )
 528 {
 529     struct device_file *file = get_fd_user( fd );
 530     struct irp_call *irp;
 531     obj_handle_t handle;
 532     irp_params_t params;
 533
 534     params.flush.major  = IRP_MJ_FLUSH_BUFFERS;
 535     params.flush.device = file->device->user_ptr;
 536
 537     irp = create_irp( file, &params, NULL, 0, 0 );
 538     if (!irp) return 0;
 539
 540     handle = queue_irp( file, irp, async_data, blocking );
 541     release_object( irp );
 542     return handle;
 543 }
 544
 545 static obj_handle_t device_file_ioctl( struct fd *fd, ioctl_code_t code, const async_data_t *async_data,
 546                                        int blocking )
 547 {
 548     struct device_file *file = get_fd_user( fd );
 549     struct irp_call *irp;
 550     obj_handle_t handle;
 551     irp_params_t params;
 552
 553     params.ioctl.major  = IRP_MJ_DEVICE_CONTROL;
 554     params.ioctl.code   = code;
 555     params.ioctl.device = file->device->user_ptr;
 556
 557     irp = create_irp( file, &params, get_req_data(), get_req_data_size(),
 558                       get_reply_max_size() );
 559     if (!irp) return 0;
 560
 561     handle = queue_irp( file, irp, async_data, blocking );
 562     release_object( irp );
 563     return handle;
 564 }
 565
 566 static struct device *create_device( struct directory *root, const struct unicode_str *name,
 567                                      struct device_manager *manager, unsigned int attr )
 568 {
 569     struct device *device;
 570
 571     if ((device = create_named_object_dir( root, name, attr, &device_ops )))
 572     {
 573         if (get_error() != STATUS_OBJECT_NAME_EXISTS)
 574         {
 575             /* initialize it if it didn't already exist */
 576             device->unix_path = NULL;
 577             device->manager = manager;
 578             list_add_tail( &manager->devices, &device->entry );
 579             list_init( &device->files );
 580         }
 581     }
 582     return device;
 583 }
 584
 585 struct device *create_unix_device( struct directory *root, const struct unicode_str *name,
 586                                    const char *unix_path )
 587 {
 588     struct device *device;
 589
 590     if ((device = create_named_object_dir( root, name, 0, &device_ops )))
 591     {
 592         device->unix_path = strdup( unix_path );
 593         device->manager = NULL;  /* no manager, requests go straight to the Unix device */
 594         list_init( &device->files );
 595         make_object_static( &device->obj );
 596     }
 597     return device;
 598
 599 }
 600
 601 /* terminate requests when the underlying device is deleted */
 602 static void delete_file( struct device_file *file )
 603 {
 604     struct irp_call *irp, *next;
 605
 606     /* terminate all pending requests */
 607     LIST_FOR_EACH_ENTRY_SAFE( irp, next, &file->requests, struct irp_call, dev_entry )
 608     {
 609         list_remove( &irp->mgr_entry );
 610         set_irp_result( irp, STATUS_FILE_DELETED, NULL, 0, 0 );
 611     }
 612 }
 613
 614 static void delete_device( struct device *device )
 615 {
 616     struct device_file *file, *next;
 617
 618     if (!device->manager) return;  /* already deleted */
 619
 620     LIST_FOR_EACH_ENTRY_SAFE( file, next, &device->files, struct device_file, entry )
 621         delete_file( file );
 622
 623     unlink_named_object( &device->obj );
 624     list_remove( &device->entry );
 625     device->manager = NULL;
 626 }
 627
 628
 629 static void device_manager_dump( struct object *obj, int verbose )
 630 {
 631     fprintf( stderr, "Device manager\n" );
 632 }
 633
 634 static int device_manager_signaled( struct object *obj, struct wait_queue_entry *entry )
 635 {
 636     struct device_manager *manager = (struct device_manager *)obj;
 637
 638     return !list_empty( &manager->requests );
 639 }
 640
 641 static void device_manager_destroy( struct object *obj )
 642 {
 643     struct device_manager *manager = (struct device_manager *)obj;
 644     struct list *ptr;
 645
 646     while ((ptr = list_head( &manager->devices )))
 647     {
 648         struct device *device = LIST_ENTRY( ptr, struct device, entry );
 649         delete_device( device );
 650     }
 651 }
 652
 653 static struct device_manager *create_device_manager(void)
 654 {
 655     struct device_manager *manager;
 656
 657     if ((manager = alloc_object( &device_manager_ops )))
 658     {
 659         list_init( &manager->devices );
 660         list_init( &manager->requests );
 661     }
 662     return manager;
 663 }
 664
 665
 666 /* create a device manager */
 667 DECL_HANDLER(create_device_manager)
 668 {
 669     struct device_manager *manager = create_device_manager();
 670
 671     if (manager)
 672     {
 673         reply->handle = alloc_handle( current->process, manager, req->access, req->attributes );
 674         release_object( manager );
 675     }
 676 }
 677
 678
 679 /* create a device */
 680 DECL_HANDLER(create_device)
 681 {
 682     struct device *device;
 683     struct unicode_str name;
 684     struct device_manager *manager;
 685     struct directory *root = NULL;
 686
 687     if (!(manager = (struct device_manager *)get_handle_obj( current->process, req->manager,
 688                                                              0, &device_manager_ops )))
 689         return;
 690
 691     get_req_unicode_str( &name );
 692     if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir, 0 )))
 693     {
 694         release_object( manager );
 695         return;
 696     }
 697
 698     if ((device = create_device( root, &name, manager, req->attributes )))
 699     {
 700         device->user_ptr = req->user_ptr;
 701         reply->handle = alloc_handle( current->process, device, req->access, req->attributes );
 702         release_object( device );
 703     }
 704
 705     if (root) release_object( root );
 706     release_object( manager );
 707 }
 708
 709
 710 /* delete a device */
 711 DECL_HANDLER(delete_device)
 712 {
 713     struct device *device;
 714
 715     if ((device = (struct device *)get_handle_obj( current->process, req->handle, 0, &device_ops )))
 716     {
 717         delete_device( device );
 718         release_object( device );
 719     }
 720 }
 721
 722
 723 /* retrieve the next pending device irp request */
 724 DECL_HANDLER(get_next_device_request)
 725 {
 726     struct irp_call *irp;
 727     struct device_manager *manager;
 728     struct list *ptr;
 729
 730     reply->params.major = IRP_MJ_MAXIMUM_FUNCTION + 1;
 731
 732     if (!(manager = (struct device_manager *)get_handle_obj( current->process, req->manager,
 733                                                              0, &device_manager_ops )))
 734         return;
 735
 736     if (req->prev)
 737     {
 738         if ((irp = (struct irp_call *)get_handle_obj( current->process, req->prev, 0, &irp_call_ops )))
 739         {
 740             set_irp_result( irp, req->status, NULL, 0, 0 );
 741             close_handle( current->process, req->prev );  /* avoid an extra round-trip for close */
 742             release_object( irp );
 743         }
 744         clear_error();
 745     }
 746
 747     if ((ptr = list_head( &manager->requests )))
 748     {
 749         irp = LIST_ENTRY( ptr, struct irp_call, mgr_entry );
 750         reply->params = irp->params;
 751         reply->client_pid = get_process_id( irp->thread->process );
 752         reply->client_tid = get_thread_id( irp->thread );
 753         reply->in_size = irp->in_size;
 754         reply->out_size = irp->out_size;
 755         if (irp->in_size > get_reply_max_size()) set_error( STATUS_BUFFER_OVERFLOW );
 756         else if ((reply->next = alloc_handle( current->process, irp, 0, 0 )))
 757         {
 758             set_reply_data_ptr( irp->in_data, irp->in_size );
 759             irp->in_data = NULL;
 760             irp->in_size = 0;
 761             list_remove( &irp->mgr_entry );
 762             list_init( &irp->mgr_entry );
 763         }
 764     }
 765     else set_error( STATUS_PENDING );
 766
 767     release_object( manager );
 768 }
 769
 770
 771 /* store results of an async irp */
 772 DECL_HANDLER(set_irp_result)
 773 {
 774     struct irp_call *irp;
 775     struct device_manager *manager;
 776
 777     if (!(manager = (struct device_manager *)get_handle_obj( current->process, req->manager,
 778                                                              0, &device_manager_ops )))
 779         return;
 780
 781     if ((irp = (struct irp_call *)get_handle_obj( current->process, req->handle, 0, &irp_call_ops )))
 782     {
 783         set_irp_result( irp, req->status, get_req_data(), get_req_data_size(), req->size );
 784         close_handle( current->process, req->handle );  /* avoid an extra round-trip for close */
 785         release_object( irp );
 786     }
 787     release_object( manager );
 788 }
 789
 790
 791 /* retrieve results of an async irp */
 792 DECL_HANDLER(get_irp_result)
 793 {
 794     struct device_file *file;
 795     struct irp_call *irp;
 796
 797     if (!(file = (struct device_file *)get_handle_obj( current->process, req->handle,
 798                                                        0, &device_file_ops )))
 799         return;
 800
 801     if ((irp = find_irp_call( file, current, req->user_arg )))
 802     {
 803         if (irp->out_data)
 804         {
 805             data_size_t size = min( irp->out_size, get_reply_max_size() );
 806             if (size)
 807             {
 808                 set_reply_data_ptr( irp->out_data, size );
 809                 irp->out_data = NULL;
 810             }
 811         }
 812         reply->size = irp->result;
 813         set_error( irp->status );
 814         list_remove( &irp->dev_entry );
 815         release_object( irp );  /* no longer on the device queue */
 816     }
 817     release_object( file );
 818 }