default_pager_add_segment

Server Interface - Add additional backing storage for a default pager.

SYNOPSIS

#include< mach/default_pager_object.h>

kern_return_t   default_pager_add_segment
                (mach_port_t                      backing_store,
                 mach_port_t                             device,
                 recnum_t                                offset,
                 recnum_t                                 count,
                 int                                record_size);

PARAMETERS

backing_store

[in backing store (receive) right] The backing store port.

device

[in device port] The port for the device containing the backing storage partition.

offset

[in scalar] The offset, in record_size units, to the beginning of the backing storage on the device.

count

[in scalar] The number of record_size units in the partition/segment.

record_size

[in scalar] The size, in bytes, of the storage device record.

DESCRIPTION

The default_pager_add_segment function is called to add a partition to a default pager's backing storage (i.e. expand the amount of backing storage available to a memory manager). The kernel does not make this call itself (which is why it can be a synchronous call); this request is only issued by tasks holding the backing store port, created with default_pager_backing_store_create, for a default memory manager. The result is that the pager may use count records on device starting at offset for paging, and each record is record_size bytes in length (note that the device_* calls are, or can be, record oriented).

RETURN VALUES

KERN_FAILURE

The default pager does not support this operation.

KERN_INVALID_ARGUMENT

The backing_store port does not represent a valid backing store or the specified segment overlaps an existing partition.

KERN_RESOURCE_SHORTAGE

The default pager is unable to allocate internal resources to manage the new backing storage.

KERN_SUCCESS

The operation was successful.

RELATED INFORMATION

Functions: default_pager_backing_store_create, default_pager_backing_store_delete, default_pager_backing_store_info.