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     struct async          *async;         /* pending async op */
  52     irp_params_t           params;        /* irp parameters */
  53     struct iosb           *iosb;          /* I/O status block */
  54 };
  55
  56 static void irp_call_dump( struct object *obj, int verbose );
  57 static int irp_call_signaled( struct object *obj, struct wait_queue_entry *entry );
  58 static void irp_call_destroy( struct object *obj );
  59
  60 static const struct object_ops irp_call_ops =
  61 {
  62     sizeof(struct irp_call),          /* size */
  63     irp_call_dump,                    /* dump */
  64     no_get_type,                      /* get_type */
  65     add_queue,                        /* add_queue */
  66     remove_queue,                     /* remove_queue */
  67     irp_call_signaled,                /* signaled */
  68     no_satisfied,                     /* satisfied */
  69     no_signal,                        /* signal */
  70     no_get_fd,                        /* get_fd */
  71     no_map_access,                    /* map_access */
  72     default_get_sd,                   /* get_sd */
  73     default_set_sd,                   /* set_sd */
  74     no_lookup_name,                   /* lookup_name */
  75     no_link_name,                     /* link_name */
  76     NULL,                             /* unlink_name */
  77     no_open_file,                     /* open_file */
  78     no_close_handle,                  /* close_handle */
  79     irp_call_destroy                  /* destroy */
  80 };
  81
  82
  83 /* device manager (a list of devices managed by the same client process) */
  84
  85 struct device_manager
  86 {
  87     struct object          obj;           /* object header */
  88     struct list            devices;       /* list of devices */
  89     struct list            requests;      /* list of pending irps across all devices */
  90 };
  91
  92 static void device_manager_dump( struct object *obj, int verbose );
  93 static int device_manager_signaled( struct object *obj, struct wait_queue_entry *entry );
  94 static void device_manager_destroy( struct object *obj );
  95
  96 static const struct object_ops device_manager_ops =
  97 {
  98     sizeof(struct device_manager),    /* size */
  99     device_manager_dump,              /* dump */
 100     no_get_type,                      /* get_type */
 101     add_queue,                        /* add_queue */
 102     remove_queue,                     /* remove_queue */
 103     device_manager_signaled,          /* signaled */
 104     no_satisfied,                     /* satisfied */
 105     no_signal,                        /* signal */
 106     no_get_fd,                        /* get_fd */
 107     no_map_access,                    /* map_access */
 108     default_get_sd,                   /* get_sd */
 109     default_set_sd,                   /* set_sd */
 110     no_lookup_name,                   /* lookup_name */
 111     no_link_name,                     /* link_name */
 112     NULL,                             /* unlink_name */
 113     no_open_file,                     /* open_file */
 114     no_close_handle,                  /* close_handle */
 115     device_manager_destroy            /* destroy */
 116 };
 117
 118
 119 /* device (a single device object) */
 120
 121 struct device
 122 {
 123     struct object          obj;           /* object header */
 124     struct device_manager *manager;       /* manager for this device (or NULL if deleted) */
 125     char                  *unix_path;     /* path to unix device if any */
 126     client_ptr_t           user_ptr;      /* opaque ptr for client side */
 127     struct list            entry;         /* entry in device manager list */
 128     struct list            files;         /* list of open files */
 129 };
 130
 131 static void device_dump( struct object *obj, int verbose );
 132 static struct object_type *device_get_type( struct object *obj );
 133 static void device_destroy( struct object *obj );
 134 static struct object *device_open_file( struct object *obj, unsigned int access,
 135                                         unsigned int sharing, unsigned int options );
 136
 137 static const struct object_ops device_ops =
 138 {
 139     sizeof(struct device),            /* size */
 140     device_dump,                      /* dump */
 141     device_get_type,                  /* get_type */
 142     no_add_queue,                     /* add_queue */
 143     NULL,                             /* remove_queue */
 144     NULL,                             /* signaled */
 145     no_satisfied,                     /* satisfied */
 146     no_signal,                        /* signal */
 147     no_get_fd,                        /* get_fd */
 148     default_fd_map_access,            /* map_access */
 149     default_get_sd,                   /* get_sd */
 150     default_set_sd,                   /* set_sd */
 151     no_lookup_name,                   /* lookup_name */
 152     directory_link_name,              /* link_name */
 153     default_unlink_name,              /* unlink_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     client_ptr_t           user_ptr;      /* opaque ptr for client side */
 168     struct list            entry;         /* entry in device list */
 169     struct list            requests;      /* list of pending irp requests */
 170 };
 171
 172 static void device_file_dump( struct object *obj, int verbose );
 173 static struct fd *device_file_get_fd( struct object *obj );
 174 static int device_file_close_handle( struct object *obj, struct process *process, obj_handle_t handle );
 175 static void device_file_destroy( struct object *obj );
 176 static enum server_fd_type device_file_get_fd_type( struct fd *fd );
 177 static obj_handle_t device_file_read( struct fd *fd, struct async *async, file_pos_t pos );
 178 static obj_handle_t device_file_write( struct fd *fd, struct async *async, file_pos_t pos );
 179 static obj_handle_t device_file_flush( struct fd *fd, struct async *async );
 180 static obj_handle_t device_file_ioctl( struct fd *fd, ioctl_code_t code, struct async *async );
 181
 182 static const struct object_ops device_file_ops =
 183 {
 184     sizeof(struct device_file),       /* size */
 185     device_file_dump,                 /* dump */
 186     no_get_type,                      /* get_type */
 187     add_queue,                        /* add_queue */
 188     remove_queue,                     /* remove_queue */
 189     default_fd_signaled,              /* signaled */
 190     no_satisfied,                     /* satisfied */
 191     no_signal,                        /* signal */
 192     device_file_get_fd,               /* get_fd */
 193     default_fd_map_access,            /* map_access */
 194     default_get_sd,                   /* get_sd */
 195     default_set_sd,                   /* set_sd */
 196     no_lookup_name,                   /* lookup_name */
 197     no_link_name,                     /* link_name */
 198     NULL,                             /* unlink_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 };
 216
 217
 218 static void irp_call_dump( struct object *obj, int verbose )
 219 {
 220     struct irp_call *irp = (struct irp_call *)obj;
 221     fprintf( stderr, "IRP call file=%p\n", irp->file );
 222 }
 223
 224 static int irp_call_signaled( struct object *obj, struct wait_queue_entry *entry )
 225 {
 226     struct irp_call *irp = (struct irp_call *)obj;
 227
 228     return !irp->file;  /* file is cleared once the irp has completed */
 229 }
 230
 231 static void irp_call_destroy( struct object *obj )
 232 {
 233     struct irp_call *irp = (struct irp_call *)obj;
 234
 235     if (irp->async)
 236     {
 237         async_terminate( irp->async, STATUS_CANCELLED );
 238         release_object( irp->async );
 239     }
 240     if (irp->iosb) release_object( irp->iosb );
 241     if (irp->file) release_object( irp->file );
 242     if (irp->thread) release_object( irp->thread );
 243 }
 244
 245 static struct irp_call *create_irp( struct device_file *file, const irp_params_t *params, struct async *async )
 246 {
 247     struct irp_call *irp;
 248
 249     if (!file->device->manager)  /* it has been deleted */
 250     {
 251         set_error( STATUS_FILE_DELETED );
 252         return NULL;
 253     }
 254
 255     if ((irp = alloc_object( &irp_call_ops )))
 256     {
 257         irp->file     = (struct device_file *)grab_object( file );
 258         irp->thread   = NULL;
 259         irp->async    = NULL;
 260         irp->params   = *params;
 261         irp->iosb     = NULL;
 262
 263         if (async) irp->iosb = async_get_iosb( async );
 264         if (!irp->iosb && !(irp->iosb = create_iosb( NULL, 0, 0 )))
 265         {
 266             release_object( irp );
 267             irp = NULL;
 268         }
 269     }
 270     return irp;
 271 }
 272
 273 static void set_irp_result( struct irp_call *irp, unsigned int status,
 274                             const void *out_data, data_size_t out_size, data_size_t result )
 275 {
 276     struct device_file *file = irp->file;
 277     struct iosb *iosb = irp->iosb;
 278
 279     if (!file) return;  /* already finished */
 280
 281     /* FIXME: handle the STATUS_PENDING case */
 282     iosb->status = status;
 283     iosb->result = result;
 284     iosb->out_size = min( iosb->out_size, out_size );
 285     if (iosb->out_size && !(iosb->out_data = memdup( out_data, iosb->out_size )))
 286         iosb->out_size = 0;
 287     irp->file = NULL;
 288     if (irp->async)
 289     {
 290         if (result) status = STATUS_ALERTED;
 291         async_terminate( irp->async, status );
 292         release_object( irp->async );
 293         irp->async = NULL;
 294     }
 295     wake_up( &irp->obj, 0 );
 296
 297     /* remove it from the device queue */
 298     list_remove( &irp->dev_entry );
 299     release_object( irp );  /* no longer on the device queue */
 300     release_object( file );
 301 }
 302
 303
 304 static void device_dump( struct object *obj, int verbose )
 305 {
 306     fputs( "Device\n", stderr );
 307 }
 308
 309 static struct object_type *device_get_type( struct object *obj )
 310 {
 311     static const WCHAR name[] = {'D','e','v','i','c','e'};
 312     static const struct unicode_str str = { name, sizeof(name) };
 313     return get_object_type( &str );
 314 }
 315
 316 static void device_destroy( struct object *obj )
 317 {
 318     struct device *device = (struct device *)obj;
 319
 320     assert( list_empty( &device->files ));
 321
 322     free( device->unix_path );
 323     if (device->manager) list_remove( &device->entry );
 324 }
 325
 326 static void add_irp_to_queue( struct device_file *file, struct irp_call *irp, struct thread *thread )
 327 {
 328     struct device_manager *manager = file->device->manager;
 329
 330     assert( manager );
 331
 332     grab_object( irp );  /* grab reference for queued irp */
 333     irp->thread = thread ? (struct thread *)grab_object( thread ) : NULL;
 334     list_add_tail( &file->requests, &irp->dev_entry );
 335     list_add_tail( &manager->requests, &irp->mgr_entry );
 336     if (list_head( &manager->requests ) == &irp->mgr_entry) wake_up( &manager->obj, 0 );  /* first one */
 337 }
 338
 339 static struct object *device_open_file( struct object *obj, unsigned int access,
 340                                         unsigned int sharing, unsigned int options )
 341 {
 342     struct device *device = (struct device *)obj;
 343     struct device_file *file;
 344
 345     if (!(file = alloc_object( &device_file_ops ))) return NULL;
 346
 347     file->device = (struct device *)grab_object( device );
 348     file->user_ptr = 0;
 349     list_init( &file->requests );
 350     list_add_tail( &device->files, &file->entry );
 351     if (device->unix_path)
 352     {
 353         mode_t mode = 0666;
 354         access = file->obj.ops->map_access( &file->obj, access );
 355         file->fd = open_fd( NULL, device->unix_path, O_NONBLOCK | O_LARGEFILE,
 356                             &mode, access, sharing, options );
 357         if (file->fd) set_fd_user( file->fd, &device_file_fd_ops, &file->obj );
 358     }
 359     else file->fd = alloc_pseudo_fd( &device_file_fd_ops, &file->obj, 0 );
 360
 361     if (!file->fd)
 362     {
 363         release_object( file );
 364         return NULL;
 365     }
 366
 367     allow_fd_caching( file->fd );
 368
 369     if (device->manager)
 370     {
 371         struct irp_call *irp;
 372         irp_params_t params;
 373
 374         memset( &params, 0, sizeof(params) );
 375         params.create.major   = IRP_MJ_CREATE;
 376         params.create.access  = access;
 377         params.create.sharing = sharing;
 378         params.create.options = options;
 379         params.create.device  = file->device->user_ptr;
 380
 381         if ((irp = create_irp( file, &params, NULL )))
 382         {
 383             add_irp_to_queue( file, irp, NULL );
 384             release_object( irp );
 385         }
 386     }
 387     return &file->obj;
 388 }
 389
 390 static void device_file_dump( struct object *obj, int verbose )
 391 {
 392     struct device_file *file = (struct device_file *)obj;
 393
 394     fprintf( stderr, "File on device %p\n", file->device );
 395 }
 396
 397 static struct fd *device_file_get_fd( struct object *obj )
 398 {
 399     struct device_file *file = (struct device_file *)obj;
 400
 401     return (struct fd *)grab_object( file->fd );
 402 }
 403
 404 static int device_file_close_handle( struct object *obj, struct process *process, obj_handle_t handle )
 405 {
 406     struct device_file *file = (struct device_file *)obj;
 407
 408     if (file->device->manager && obj->handle_count == 1)  /* last handle */
 409     {
 410         struct irp_call *irp;
 411         irp_params_t params;
 412
 413         memset( &params, 0, sizeof(params) );
 414         params.close.major = IRP_MJ_CLOSE;
 415         params.close.file  = file->user_ptr;
 416
 417         if ((irp = create_irp( file, &params, NULL )))
 418         {
 419             add_irp_to_queue( file, irp, NULL );
 420             release_object( irp );
 421         }
 422     }
 423     return 1;
 424 }
 425
 426 static void device_file_destroy( struct object *obj )
 427 {
 428     struct device_file *file = (struct device_file *)obj;
 429     struct irp_call *irp, *next;
 430
 431     LIST_FOR_EACH_ENTRY_SAFE( irp, next, &file->requests, struct irp_call, dev_entry )
 432     {
 433         list_remove( &irp->dev_entry );
 434         release_object( irp );  /* no longer on the device queue */
 435     }
 436     if (file->fd) release_object( file->fd );
 437     list_remove( &file->entry );
 438     release_object( file->device );
 439 }
 440
 441 static void set_file_user_ptr( struct device_file *file, client_ptr_t ptr )
 442 {
 443     struct irp_call *irp;
 444
 445     if (file->user_ptr == ptr) return;  /* nothing to do */
 446
 447     file->user_ptr = ptr;
 448
 449     /* update already queued irps */
 450
 451     LIST_FOR_EACH_ENTRY( irp, &file->requests, struct irp_call, dev_entry )
 452     {
 453         switch (irp->params.major)
 454         {
 455         case IRP_MJ_CLOSE:          irp->params.close.file = ptr; break;
 456         case IRP_MJ_READ:           irp->params.read.file  = ptr; break;
 457         case IRP_MJ_WRITE:          irp->params.write.file = ptr; break;
 458         case IRP_MJ_FLUSH_BUFFERS:  irp->params.flush.file = ptr; break;
 459         case IRP_MJ_DEVICE_CONTROL: irp->params.ioctl.file = ptr; break;
 460         }
 461     }
 462 }
 463
 464 /* queue an irp to the device */
 465 static obj_handle_t queue_irp( struct device_file *file, struct irp_call *irp, struct async *async )
 466 {
 467     obj_handle_t handle = 0;
 468
 469     if (async_is_blocking( async ) && !(handle = alloc_handle( current->process, async, SYNCHRONIZE, 0 ))) return 0;
 470
 471     if (!fd_queue_async( file->fd, async, ASYNC_TYPE_WAIT ))
 472     {
 473         if (handle) close_handle( current->process, handle );
 474         return 0;
 475     }
 476     irp->async = (struct async *)grab_object( async );
 477     add_irp_to_queue( file, irp, current );
 478     set_error( STATUS_PENDING );
 479     return handle;
 480 }
 481
 482 static enum server_fd_type device_file_get_fd_type( struct fd *fd )
 483 {
 484     return FD_TYPE_DEVICE;
 485 }
 486
 487 static obj_handle_t device_file_read( struct fd *fd, struct async *async, file_pos_t pos )
 488 {
 489     struct device_file *file = get_fd_user( fd );
 490     struct irp_call *irp;
 491     obj_handle_t handle;
 492     irp_params_t params;
 493
 494     memset( &params, 0, sizeof(params) );
 495     params.read.major = IRP_MJ_READ;
 496     params.read.key   = 0;
 497     params.read.pos   = pos;
 498     params.read.file  = file->user_ptr;
 499
 500     irp = create_irp( file, &params, async );
 501     if (!irp) return 0;
 502
 503     handle = queue_irp( file, irp, async );
 504     release_object( irp );
 505     return handle;
 506 }
 507
 508 static obj_handle_t device_file_write( struct fd *fd, struct async *async, file_pos_t pos )
 509 {
 510     struct device_file *file = get_fd_user( fd );
 511     struct irp_call *irp;
 512     obj_handle_t handle;
 513     irp_params_t params;
 514
 515     memset( &params, 0, sizeof(params) );
 516     params.write.major = IRP_MJ_WRITE;
 517     params.write.key   = 0;
 518     params.write.pos   = pos;
 519     params.write.file  = file->user_ptr;
 520
 521     irp = create_irp( file, &params, async );
 522     if (!irp) return 0;
 523
 524     handle = queue_irp( file, irp, async );
 525     release_object( irp );
 526     return handle;
 527 }
 528
 529 static obj_handle_t device_file_flush( struct fd *fd, struct async *async )
 530 {
 531     struct device_file *file = get_fd_user( fd );
 532     struct irp_call *irp;
 533     obj_handle_t handle;
 534     irp_params_t params;
 535
 536     memset( &params, 0, sizeof(params) );
 537     params.flush.major = IRP_MJ_FLUSH_BUFFERS;
 538     params.flush.file  = file->user_ptr;
 539
 540     irp = create_irp( file, &params, NULL );
 541     if (!irp) return 0;
 542
 543     handle = queue_irp( file, irp, async );
 544     release_object( irp );
 545     return handle;
 546 }
 547
 548 static obj_handle_t device_file_ioctl( struct fd *fd, ioctl_code_t code, struct async *async )
 549 {
 550     struct device_file *file = get_fd_user( fd );
 551     struct irp_call *irp;
 552     obj_handle_t handle;
 553     irp_params_t params;
 554
 555     memset( &params, 0, sizeof(params) );
 556     params.ioctl.major = IRP_MJ_DEVICE_CONTROL;
 557     params.ioctl.code  = code;
 558     params.ioctl.file = file->user_ptr;
 559
 560     irp = create_irp( file, &params, async );
 561     if (!irp) return 0;
 562
 563     handle = queue_irp( file, irp, async );
 564     release_object( irp );
 565     return handle;
 566 }
 567
 568 static struct device *create_device( struct object *root, const struct unicode_str *name,
 569                                      struct device_manager *manager, unsigned int attr )
 570 {
 571     struct device *device;
 572
 573     if ((device = create_named_object( root, &device_ops, name, attr, NULL )))
 574     {
 575         if (get_error() != STATUS_OBJECT_NAME_EXISTS)
 576         {
 577             /* initialize it if it didn't already exist */
 578             device->unix_path = NULL;
 579             device->manager = manager;
 580             list_add_tail( &manager->devices, &device->entry );
 581             list_init( &device->files );
 582         }
 583     }
 584     return device;
 585 }
 586
 587 struct object *create_unix_device( struct object *root, const struct unicode_str *name,
 588                                    const char *unix_path )
 589 {
 590     struct device *device;
 591
 592     if ((device = create_named_object( root, &device_ops, name, 0, NULL )))
 593     {
 594         device->unix_path = strdup( unix_path );
 595         device->manager = NULL;  /* no manager, requests go straight to the Unix device */
 596         list_init( &device->files );
 597     }
 598     return &device->obj;
 599
 600 }
 601
 602 /* terminate requests when the underlying device is deleted */
 603 static void delete_file( struct device_file *file )
 604 {
 605     struct irp_call *irp, *next;
 606
 607     /* terminate all pending requests */
 608     LIST_FOR_EACH_ENTRY_SAFE( irp, next, &file->requests, struct irp_call, dev_entry )
 609     {
 610         list_remove( &irp->mgr_entry );
 611         set_irp_result( irp, STATUS_FILE_DELETED, NULL, 0, 0 );
 612     }
 613 }
 614
 615 static void delete_device( struct device *device )
 616 {
 617     struct device_file *file, *next;
 618
 619     if (!device->manager) return;  /* already deleted */
 620
 621     LIST_FOR_EACH_ENTRY_SAFE( file, next, &device->files, struct device_file, entry )
 622         delete_file( file );
 623
 624     unlink_named_object( &device->obj );
 625     list_remove( &device->entry );
 626     device->manager = NULL;
 627 }
 628
 629
 630 static void device_manager_dump( struct object *obj, int verbose )
 631 {
 632     fprintf( stderr, "Device manager\n" );
 633 }
 634
 635 static int device_manager_signaled( struct object *obj, struct wait_queue_entry *entry )
 636 {
 637     struct device_manager *manager = (struct device_manager *)obj;
 638
 639     return !list_empty( &manager->requests );
 640 }
 641
 642 static void device_manager_destroy( struct object *obj )
 643 {
 644     struct device_manager *manager = (struct device_manager *)obj;
 645     struct list *ptr;
 646
 647     while ((ptr = list_head( &manager->devices )))
 648     {
 649         struct device *device = LIST_ENTRY( ptr, struct device, entry );
 650         delete_device( device );
 651     }
 652 }
 653
 654 static struct device_manager *create_device_manager(void)
 655 {
 656     struct device_manager *manager;
 657
 658     if ((manager = alloc_object( &device_manager_ops )))
 659     {
 660         list_init( &manager->devices );
 661         list_init( &manager->requests );
 662     }
 663     return manager;
 664 }
 665
 666
 667 /* create a device manager */
 668 DECL_HANDLER(create_device_manager)
 669 {
 670     struct device_manager *manager = create_device_manager();
 671
 672     if (manager)
 673     {
 674         reply->handle = alloc_handle( current->process, manager, req->access, req->attributes );
 675         release_object( manager );
 676     }
 677 }
 678
 679
 680 /* create a device */
 681 DECL_HANDLER(create_device)
 682 {
 683     struct device *device;
 684     struct unicode_str name = get_req_unicode_str();
 685     struct device_manager *manager;
 686     struct object *root = NULL;
 687
 688     if (!(manager = (struct device_manager *)get_handle_obj( current->process, req->manager,
 689                                                              0, &device_manager_ops )))
 690         return;
 691
 692     if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir )))
 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     struct iosb *iosb;
 730
 731     reply->params.major = IRP_MJ_MAXIMUM_FUNCTION + 1;
 732
 733     if (!(manager = (struct device_manager *)get_handle_obj( current->process, req->manager,
 734                                                              0, &device_manager_ops )))
 735         return;
 736
 737     if (req->prev)
 738     {
 739         if ((irp = (struct irp_call *)get_handle_obj( current->process, req->prev, 0, &irp_call_ops )))
 740         {
 741             set_irp_result( irp, req->status, NULL, 0, 0 );
 742             close_handle( current->process, req->prev );  /* avoid an extra round-trip for close */
 743             release_object( irp );
 744         }
 745         clear_error();
 746     }
 747
 748     if ((ptr = list_head( &manager->requests )))
 749     {
 750         irp = LIST_ENTRY( ptr, struct irp_call, mgr_entry );
 751         if (irp->thread)
 752         {
 753             reply->client_pid = get_process_id( irp->thread->process );
 754             reply->client_tid = get_thread_id( irp->thread );
 755         }
 756         reply->params = irp->params;
 757         iosb = irp->iosb;
 758         reply->in_size = iosb->in_size;
 759         reply->out_size = iosb->out_size;
 760         if (iosb->in_size > get_reply_max_size()) set_error( STATUS_BUFFER_OVERFLOW );
 761         else if ((reply->next = alloc_handle( current->process, irp, 0, 0 )))
 762         {
 763             set_reply_data_ptr( iosb->in_data, iosb->in_size );
 764             iosb->in_data = NULL;
 765             iosb->in_size = 0;
 766             list_remove( &irp->mgr_entry );
 767             list_init( &irp->mgr_entry );
 768         }
 769     }
 770     else set_error( STATUS_PENDING );
 771
 772     release_object( manager );
 773 }
 774
 775
 776 /* store results of an async irp */
 777 DECL_HANDLER(set_irp_result)
 778 {
 779     struct irp_call *irp;
 780
 781     if ((irp = (struct irp_call *)get_handle_obj( current->process, req->handle, 0, &irp_call_ops )))
 782     {
 783         if (irp->file) set_file_user_ptr( irp->file, req->file_ptr );
 784         set_irp_result( irp, req->status, get_req_data(), get_req_data_size(), req->size );
 785         close_handle( current->process, req->handle );  /* avoid an extra round-trip for close */
 786         release_object( irp );
 787     }
 788 }