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 int device_file_read( struct fd *fd, struct async *async, file_pos_t pos );
 178 static int device_file_write( struct fd *fd, struct async *async, file_pos_t pos );
 179 static int device_file_flush( struct fd *fd, struct async *async );
 180 static int 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     no_fd_get_volume_info,            /* get_volume_info */
 213     device_file_ioctl,                /* ioctl */
 214     default_fd_queue_async,           /* queue_async */
 215     default_fd_reselect_async         /* reselect_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     if (irp->async)
 237     {
 238         async_terminate( irp->async, STATUS_CANCELLED );
 239         release_object( irp->async );
 240     }
 241     if (irp->iosb) release_object( irp->iosb );
 242     if (irp->file) release_object( irp->file );
 243     if (irp->thread) release_object( irp->thread );
 244 }
 245
 246 static struct irp_call *create_irp( struct device_file *file, const irp_params_t *params, struct async *async )
 247 {
 248     struct irp_call *irp;
 249
 250     if (!file->device->manager)  /* it has been deleted */
 251     {
 252         set_error( STATUS_FILE_DELETED );
 253         return NULL;
 254     }
 255
 256     if ((irp = alloc_object( &irp_call_ops )))
 257     {
 258         irp->file     = (struct device_file *)grab_object( file );
 259         irp->thread   = NULL;
 260         irp->async    = NULL;
 261         irp->params   = *params;
 262         irp->iosb     = NULL;
 263
 264         if (async) irp->iosb = async_get_iosb( async );
 265         if (!irp->iosb && !(irp->iosb = create_iosb( NULL, 0, 0 )))
 266         {
 267             release_object( irp );
 268             irp = NULL;
 269         }
 270     }
 271     return irp;
 272 }
 273
 274 static void set_irp_result( struct irp_call *irp, unsigned int status,
 275                             const void *out_data, data_size_t out_size, data_size_t result )
 276 {
 277     struct device_file *file = irp->file;
 278     struct iosb *iosb = irp->iosb;
 279
 280     if (!file) return;  /* already finished */
 281
 282     /* FIXME: handle the STATUS_PENDING case */
 283     iosb->status = status;
 284     iosb->result = result;
 285     iosb->out_size = min( iosb->out_size, out_size );
 286     if (iosb->out_size && !(iosb->out_data = memdup( out_data, iosb->out_size )))
 287         iosb->out_size = 0;
 288     irp->file = NULL;
 289     if (irp->async)
 290     {
 291         if (result) status = STATUS_ALERTED;
 292         async_terminate( irp->async, status );
 293         release_object( irp->async );
 294         irp->async = NULL;
 295     }
 296     wake_up( &irp->obj, 0 );
 297
 298     /* remove it from the device queue */
 299     list_remove( &irp->dev_entry );
 300     release_object( irp );  /* no longer on the device queue */
 301     release_object( file );
 302 }
 303
 304
 305 static void device_dump( struct object *obj, int verbose )
 306 {
 307     fputs( "Device\n", stderr );
 308 }
 309
 310 static struct object_type *device_get_type( struct object *obj )
 311 {
 312     static const WCHAR name[] = {'D','e','v','i','c','e'};
 313     static const struct unicode_str str = { name, sizeof(name) };
 314     return get_object_type( &str );
 315 }
 316
 317 static void device_destroy( struct object *obj )
 318 {
 319     struct device *device = (struct device *)obj;
 320
 321     assert( list_empty( &device->files ));
 322
 323     free( device->unix_path );
 324     if (device->manager) list_remove( &device->entry );
 325 }
 326
 327 static void add_irp_to_queue( struct device_file *file, struct irp_call *irp, struct thread *thread )
 328 {
 329     struct device_manager *manager = file->device->manager;
 330
 331     assert( manager );
 332
 333     grab_object( irp );  /* grab reference for queued irp */
 334     irp->thread = thread ? (struct thread *)grab_object( thread ) : NULL;
 335     list_add_tail( &file->requests, &irp->dev_entry );
 336     list_add_tail( &manager->requests, &irp->mgr_entry );
 337     if (list_head( &manager->requests ) == &irp->mgr_entry) wake_up( &manager->obj, 0 );  /* first one */
 338 }
 339
 340 static struct object *device_open_file( struct object *obj, unsigned int access,
 341                                         unsigned int sharing, unsigned int options )
 342 {
 343     struct device *device = (struct device *)obj;
 344     struct device_file *file;
 345
 346     if (!(file = alloc_object( &device_file_ops ))) return NULL;
 347
 348     file->device = (struct device *)grab_object( device );
 349     file->user_ptr = 0;
 350     list_init( &file->requests );
 351     list_add_tail( &device->files, &file->entry );
 352     if (device->unix_path)
 353     {
 354         mode_t mode = 0666;
 355         access = file->obj.ops->map_access( &file->obj, access );
 356         file->fd = open_fd( NULL, device->unix_path, O_NONBLOCK | O_LARGEFILE,
 357                             &mode, access, sharing, options );
 358         if (file->fd) set_fd_user( file->fd, &device_file_fd_ops, &file->obj );
 359     }
 360     else file->fd = alloc_pseudo_fd( &device_file_fd_ops, &file->obj, 0 );
 361
 362     if (!file->fd)
 363     {
 364         release_object( file );
 365         return NULL;
 366     }
 367
 368     allow_fd_caching( file->fd );
 369
 370     if (device->manager)
 371     {
 372         struct irp_call *irp;
 373         irp_params_t params;
 374
 375         memset( &params, 0, sizeof(params) );
 376         params.create.major   = IRP_MJ_CREATE;
 377         params.create.access  = access;
 378         params.create.sharing = sharing;
 379         params.create.options = options;
 380         params.create.device  = file->device->user_ptr;
 381
 382         if ((irp = create_irp( file, &params, NULL )))
 383         {
 384             add_irp_to_queue( file, irp, NULL );
 385             release_object( irp );
 386         }
 387     }
 388     return &file->obj;
 389 }
 390
 391 static void device_file_dump( struct object *obj, int verbose )
 392 {
 393     struct device_file *file = (struct device_file *)obj;
 394
 395     fprintf( stderr, "File on device %p\n", file->device );
 396 }
 397
 398 static struct fd *device_file_get_fd( struct object *obj )
 399 {
 400     struct device_file *file = (struct device_file *)obj;
 401
 402     return (struct fd *)grab_object( file->fd );
 403 }
 404
 405 static int device_file_close_handle( struct object *obj, struct process *process, obj_handle_t handle )
 406 {
 407     struct device_file *file = (struct device_file *)obj;
 408
 409     if (file->device->manager && obj->handle_count == 1)  /* last handle */
 410     {
 411         struct irp_call *irp;
 412         irp_params_t params;
 413
 414         memset( &params, 0, sizeof(params) );
 415         params.close.major = IRP_MJ_CLOSE;
 416         params.close.file  = file->user_ptr;
 417
 418         if ((irp = create_irp( file, &params, NULL )))
 419         {
 420             add_irp_to_queue( file, irp, NULL );
 421             release_object( irp );
 422         }
 423     }
 424     return 1;
 425 }
 426
 427 static void device_file_destroy( struct object *obj )
 428 {
 429     struct device_file *file = (struct device_file *)obj;
 430     struct irp_call *irp, *next;
 431
 432     LIST_FOR_EACH_ENTRY_SAFE( irp, next, &file->requests, struct irp_call, dev_entry )
 433     {
 434         list_remove( &irp->dev_entry );
 435         release_object( irp );  /* no longer on the device queue */
 436     }
 437     if (file->fd) release_object( file->fd );
 438     list_remove( &file->entry );
 439     release_object( file->device );
 440 }
 441
 442 static void set_file_user_ptr( struct device_file *file, client_ptr_t ptr )
 443 {
 444     struct irp_call *irp;
 445
 446     if (file->user_ptr == ptr) return;  /* nothing to do */
 447
 448     file->user_ptr = ptr;
 449
 450     /* update already queued irps */
 451
 452     LIST_FOR_EACH_ENTRY( irp, &file->requests, struct irp_call, dev_entry )
 453     {
 454         switch (irp->params.major)
 455         {
 456         case IRP_MJ_CLOSE:          irp->params.close.file = ptr; break;
 457         case IRP_MJ_READ:           irp->params.read.file  = ptr; break;
 458         case IRP_MJ_WRITE:          irp->params.write.file = ptr; break;
 459         case IRP_MJ_FLUSH_BUFFERS:  irp->params.flush.file = ptr; break;
 460         case IRP_MJ_DEVICE_CONTROL: irp->params.ioctl.file = ptr; break;
 461         }
 462     }
 463 }
 464
 465 /* queue an irp to the device */
 466 static int queue_irp( struct device_file *file, const irp_params_t *params, struct async *async )
 467 {
 468     struct irp_call *irp = create_irp( file, params, async );
 469     if (!irp) return 0;
 470
 471     fd_queue_async( file->fd, async, ASYNC_TYPE_WAIT );
 472     irp->async = (struct async *)grab_object( async );
 473     add_irp_to_queue( file, irp, current );
 474     release_object( irp );
 475     set_error( STATUS_PENDING );
 476     return 1;
 477 }
 478
 479 static enum server_fd_type device_file_get_fd_type( struct fd *fd )
 480 {
 481     return FD_TYPE_DEVICE;
 482 }
 483
 484 static int device_file_read( struct fd *fd, struct async *async, file_pos_t pos )
 485 {
 486     struct device_file *file = get_fd_user( fd );
 487     irp_params_t params;
 488
 489     memset( &params, 0, sizeof(params) );
 490     params.read.major = IRP_MJ_READ;
 491     params.read.key   = 0;
 492     params.read.pos   = pos;
 493     params.read.file  = file->user_ptr;
 494     return queue_irp( file, &params, async );
 495 }
 496
 497 static int device_file_write( struct fd *fd, struct async *async, file_pos_t pos )
 498 {
 499     struct device_file *file = get_fd_user( fd );
 500     irp_params_t params;
 501
 502     memset( &params, 0, sizeof(params) );
 503     params.write.major = IRP_MJ_WRITE;
 504     params.write.key   = 0;
 505     params.write.pos   = pos;
 506     params.write.file  = file->user_ptr;
 507     return queue_irp( file, &params, async );
 508 }
 509
 510 static int device_file_flush( struct fd *fd, struct async *async )
 511 {
 512     struct device_file *file = get_fd_user( fd );
 513     irp_params_t params;
 514
 515     memset( &params, 0, sizeof(params) );
 516     params.flush.major = IRP_MJ_FLUSH_BUFFERS;
 517     params.flush.file  = file->user_ptr;
 518     return queue_irp( file, &params, NULL );
 519 }
 520
 521 static int device_file_ioctl( struct fd *fd, ioctl_code_t code, struct async *async )
 522 {
 523     struct device_file *file = get_fd_user( fd );
 524     irp_params_t params;
 525
 526     memset( &params, 0, sizeof(params) );
 527     params.ioctl.major = IRP_MJ_DEVICE_CONTROL;
 528     params.ioctl.code  = code;
 529     params.ioctl.file = file->user_ptr;
 530     return queue_irp( file, &params, async );
 531 }
 532
 533 static struct device *create_device( struct object *root, const struct unicode_str *name,
 534                                      struct device_manager *manager, unsigned int attr )
 535 {
 536     struct device *device;
 537
 538     if ((device = create_named_object( root, &device_ops, name, attr, NULL )))
 539     {
 540         if (get_error() != STATUS_OBJECT_NAME_EXISTS)
 541         {
 542             /* initialize it if it didn't already exist */
 543             device->unix_path = NULL;
 544             device->manager = manager;
 545             list_add_tail( &manager->devices, &device->entry );
 546             list_init( &device->files );
 547         }
 548     }
 549     return device;
 550 }
 551
 552 struct object *create_unix_device( struct object *root, const struct unicode_str *name,
 553                                    const char *unix_path )
 554 {
 555     struct device *device;
 556
 557     if ((device = create_named_object( root, &device_ops, name, 0, NULL )))
 558     {
 559         device->unix_path = strdup( unix_path );
 560         device->manager = NULL;  /* no manager, requests go straight to the Unix device */
 561         list_init( &device->files );
 562     }
 563     return &device->obj;
 564
 565 }
 566
 567 /* terminate requests when the underlying device is deleted */
 568 static void delete_file( struct device_file *file )
 569 {
 570     struct irp_call *irp, *next;
 571
 572     /* terminate all pending requests */
 573     LIST_FOR_EACH_ENTRY_SAFE( irp, next, &file->requests, struct irp_call, dev_entry )
 574     {
 575         list_remove( &irp->mgr_entry );
 576         set_irp_result( irp, STATUS_FILE_DELETED, NULL, 0, 0 );
 577     }
 578 }
 579
 580 static void delete_device( struct device *device )
 581 {
 582     struct device_file *file, *next;
 583
 584     if (!device->manager) return;  /* already deleted */
 585
 586     LIST_FOR_EACH_ENTRY_SAFE( file, next, &device->files, struct device_file, entry )
 587         delete_file( file );
 588
 589     unlink_named_object( &device->obj );
 590     list_remove( &device->entry );
 591     device->manager = NULL;
 592 }
 593
 594
 595 static void device_manager_dump( struct object *obj, int verbose )
 596 {
 597     fprintf( stderr, "Device manager\n" );
 598 }
 599
 600 static int device_manager_signaled( struct object *obj, struct wait_queue_entry *entry )
 601 {
 602     struct device_manager *manager = (struct device_manager *)obj;
 603
 604     return !list_empty( &manager->requests );
 605 }
 606
 607 static void device_manager_destroy( struct object *obj )
 608 {
 609     struct device_manager *manager = (struct device_manager *)obj;
 610     struct list *ptr;
 611
 612     while ((ptr = list_head( &manager->devices )))
 613     {
 614         struct device *device = LIST_ENTRY( ptr, struct device, entry );
 615         delete_device( device );
 616     }
 617 }
 618
 619 static struct device_manager *create_device_manager(void)
 620 {
 621     struct device_manager *manager;
 622
 623     if ((manager = alloc_object( &device_manager_ops )))
 624     {
 625         list_init( &manager->devices );
 626         list_init( &manager->requests );
 627     }
 628     return manager;
 629 }
 630
 631
 632 /* create a device manager */
 633 DECL_HANDLER(create_device_manager)
 634 {
 635     struct device_manager *manager = create_device_manager();
 636
 637     if (manager)
 638     {
 639         reply->handle = alloc_handle( current->process, manager, req->access, req->attributes );
 640         release_object( manager );
 641     }
 642 }
 643
 644
 645 /* create a device */
 646 DECL_HANDLER(create_device)
 647 {
 648     struct device *device;
 649     struct unicode_str name = get_req_unicode_str();
 650     struct device_manager *manager;
 651     struct object *root = NULL;
 652
 653     if (!(manager = (struct device_manager *)get_handle_obj( current->process, req->manager,
 654                                                              0, &device_manager_ops )))
 655         return;
 656
 657     if (req->rootdir && !(root = get_directory_obj( current->process, req->rootdir )))
 658     {
 659         release_object( manager );
 660         return;
 661     }
 662
 663     if ((device = create_device( root, &name, manager, req->attributes )))
 664     {
 665         device->user_ptr = req->user_ptr;
 666         reply->handle = alloc_handle( current->process, device, req->access, req->attributes );
 667         release_object( device );
 668     }
 669
 670     if (root) release_object( root );
 671     release_object( manager );
 672 }
 673
 674
 675 /* delete a device */
 676 DECL_HANDLER(delete_device)
 677 {
 678     struct device *device;
 679
 680     if ((device = (struct device *)get_handle_obj( current->process, req->handle, 0, &device_ops )))
 681     {
 682         delete_device( device );
 683         release_object( device );
 684     }
 685 }
 686
 687
 688 /* retrieve the next pending device irp request */
 689 DECL_HANDLER(get_next_device_request)
 690 {
 691     struct irp_call *irp;
 692     struct device_manager *manager;
 693     struct list *ptr;
 694     struct iosb *iosb;
 695
 696     reply->params.major = IRP_MJ_MAXIMUM_FUNCTION + 1;
 697
 698     if (!(manager = (struct device_manager *)get_handle_obj( current->process, req->manager,
 699                                                              0, &device_manager_ops )))
 700         return;
 701
 702     if (req->prev)
 703     {
 704         if ((irp = (struct irp_call *)get_handle_obj( current->process, req->prev, 0, &irp_call_ops )))
 705         {
 706             set_irp_result( irp, req->status, NULL, 0, 0 );
 707             close_handle( current->process, req->prev );  /* avoid an extra round-trip for close */
 708             release_object( irp );
 709         }
 710         clear_error();
 711     }
 712
 713     if ((ptr = list_head( &manager->requests )))
 714     {
 715         irp = LIST_ENTRY( ptr, struct irp_call, mgr_entry );
 716         if (irp->thread)
 717         {
 718             reply->client_pid = get_process_id( irp->thread->process );
 719             reply->client_tid = get_thread_id( irp->thread );
 720         }
 721         reply->params = irp->params;
 722         iosb = irp->iosb;
 723         reply->in_size = iosb->in_size;
 724         reply->out_size = iosb->out_size;
 725         if (iosb->in_size > get_reply_max_size()) set_error( STATUS_BUFFER_OVERFLOW );
 726         else if ((reply->next = alloc_handle( current->process, irp, 0, 0 )))
 727         {
 728             set_reply_data_ptr( iosb->in_data, iosb->in_size );
 729             iosb->in_data = NULL;
 730             iosb->in_size = 0;
 731             list_remove( &irp->mgr_entry );
 732             list_init( &irp->mgr_entry );
 733         }
 734     }
 735     else set_error( STATUS_PENDING );
 736
 737     release_object( manager );
 738 }
 739
 740
 741 /* store results of an async irp */
 742 DECL_HANDLER(set_irp_result)
 743 {
 744     struct irp_call *irp;
 745
 746     if ((irp = (struct irp_call *)get_handle_obj( current->process, req->handle, 0, &irp_call_ops )))
 747     {
 748         if (irp->file) set_file_user_ptr( irp->file, req->file_ptr );
 749         set_irp_result( irp, req->status, get_req_data(), get_req_data_size(), req->size );
 750         close_handle( current->process, req->handle );  /* avoid an extra round-trip for close */
 751         release_object( irp );
 752     }
 753 }