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server: Implement read and write requests for device files.

This commit is contained in:
Alexandre Julliard 2015-05-05 12:51:11 +09:00
parent 41ea55294e
commit faa1db4d13
1 changed files with 74 additions and 33 deletions
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107
server/device.c
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@ -128,6 +128,10 @@ static void device_destroy( struct object *obj );
static struct object *device_open_file( struct object *obj, unsigned int access,
unsigned int sharing, unsigned int options );
static enum server_fd_type device_get_fd_type( struct fd *fd );
static obj_handle_t device_read( struct fd *fd, const async_data_t *async_data, int blocking,
file_pos_t pos );
static obj_handle_t device_write( struct fd *fd, const async_data_t *async_data, int blocking,
file_pos_t pos, data_size_t *written );
static obj_handle_t device_ioctl( struct fd *fd, ioctl_code_t code, const async_data_t *async_data,
int blocking );
@ -156,8 +160,8 @@ static const struct fd_ops device_fd_ops =
default_fd_get_poll_events, /* get_poll_events */
default_poll_event, /* poll_event */
device_get_fd_type, /* get_fd_type */
no_fd_read, /* read */
no_fd_write, /* write */
device_read, /* read */
device_write, /* write */
no_fd_flush, /* flush */
device_ioctl, /* ioctl */
default_fd_queue_async, /* queue_async */
@ -199,6 +203,12 @@ static struct irp_call *create_irp( struct device *device, unsigned int type, co
{
struct irp_call *irp;
if (!device->manager) /* it has been deleted */
{
set_error( STATUS_FILE_DELETED );
return NULL;
}
if ((irp = alloc_object( &irp_call_ops )))
{
irp->device = (struct device *)grab_object( device );
@ -315,45 +325,76 @@ static struct irp_call *find_irp_call( struct device *device, struct thread *thr
return NULL;
}
/* queue an irp to the device */
static obj_handle_t queue_irp( struct device *device, struct irp_call *irp,
const async_data_t *async_data, int blocking )
{
obj_handle_t handle = 0;
if (blocking && !(handle = alloc_handle( current->process, irp, SYNCHRONIZE, 0 ))) return 0;
if (!(irp->async = fd_queue_async( device->fd, async_data, ASYNC_TYPE_WAIT )))
{
if (handle) close_handle( current->process, handle );
return 0;
}
irp->thread = (struct thread *)grab_object( current );
irp->user_arg = async_data->arg;
grab_object( irp ); /* grab reference for queued irp */
list_add_tail( &device->requests, &irp->dev_entry );
list_add_tail( &device->manager->requests, &irp->mgr_entry );
if (list_head( &device->manager->requests ) == &irp->mgr_entry) /* first one */
wake_up( &device->manager->obj, 0 );
set_error( STATUS_PENDING );
return handle;
}
static obj_handle_t device_read( struct fd *fd, const async_data_t *async_data, int blocking,
file_pos_t pos )
{
struct device *device = get_fd_user( fd );
struct irp_call *irp;
obj_handle_t handle;
irp = create_irp( device, IRP_MJ_READ, NULL, 0, get_reply_max_size() );
if (!irp) return 0;
handle = queue_irp( device, irp, async_data, blocking );
release_object( irp );
return handle;
}
static obj_handle_t device_write( struct fd *fd, const async_data_t *async_data, int blocking,
file_pos_t pos, data_size_t *written )
{
struct device *device = get_fd_user( fd );
struct irp_call *irp;
obj_handle_t handle;
irp = create_irp( device, IRP_MJ_WRITE, get_req_data(), get_req_data_size(), 0 );
if (!irp) return 0;
handle = queue_irp( device, irp, async_data, blocking );
release_object( irp );
return handle;
}
static obj_handle_t device_ioctl( struct fd *fd, ioctl_code_t code, const async_data_t *async_data,
int blocking )
{
struct device *device = get_fd_user( fd );
struct irp_call *irp;
obj_handle_t handle = 0;
obj_handle_t handle;
if (!device->manager) /* it has been deleted */
{
set_error( STATUS_FILE_DELETED );
return 0;
}
irp = create_irp( device, IRP_MJ_DEVICE_CONTROL, get_req_data(), get_req_data_size(),
get_reply_max_size() );
if (!irp) return 0;
if (!(irp = create_irp( device, IRP_MJ_DEVICE_CONTROL, get_req_data(), get_req_data_size(),
get_reply_max_size() )))
return 0;
irp->code = code;
irp->code = code;
irp->thread = (struct thread *)grab_object( current );
irp->user_arg = async_data->arg;
if (blocking && !(handle = alloc_handle( current->process, irp, SYNCHRONIZE, 0 )))
{
release_object( irp );
return 0;
}
if (!(irp->async = fd_queue_async( device->fd, async_data, ASYNC_TYPE_WAIT )))
{
if (handle) close_handle( current->process, handle );
release_object( irp );
return 0;
}
list_add_tail( &device->requests, &irp->dev_entry );
list_add_tail( &device->manager->requests, &irp->mgr_entry );
if (list_head( &device->manager->requests ) == &irp->mgr_entry) /* first one */
wake_up( &device->manager->obj, 0 );
/* don't release irp since it is now queued in the device */
set_error( STATUS_PENDING );
handle = queue_irp( device, irp, async_data, blocking );
release_object( irp );
return handle;
}