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Annotation of OSKit-Mach/oskit/ds_partition.c, revision 1.1.1.1

1.1       root        1: /* device server routines for disk partitions within oskit block devices
                      2:  */
                      3: 
                      4: #include "ds_oskit.h"
                      5: 
                      6: #include <oskit/io/blkio.h>
                      7: #include <oskit/diskpart/diskpart.h>
                      8: 
                      9: static io_return_t
                     10: adjust_recnum (device_t dev, recnum_t *recnum, unsigned int count)
                     11: {
                     12:   recnum_t countrecs = count / dev->com.blkpart.blk->com.blk.size;
                     13:   if (*recnum + countrecs > dev->com.blkpart.part->size)
                     14:     INVALREC;
                     15:   *recnum += dev->com.blkpart.part->start;
                     16:   return 0;
                     17: }
                     18: 
                     19: io_return_t
                     20: ds_blkpart_write (device_t dev, ipc_port_t reply_port,
                     21:                  mach_msg_type_name_t reply_port_type, dev_mode_t mode,
                     22:                  recnum_t recnum, io_buf_ptr_t data, unsigned int count,
                     23:                  int *bytes_written)
                     24: {
                     25:   return (adjust_recnum (dev, &recnum, count) ?:
                     26:          ds_device_write (dev->com.blkpart.blk,
                     27:                           reply_port, reply_port_type,
                     28:                           mode, recnum, data, count, bytes_written));
                     29: }
                     30: 
                     31: io_return_t
                     32: ds_blkpart_write_inband (device_t dev, ipc_port_t reply_port,
                     33:                         mach_msg_type_name_t reply_port_type, dev_mode_t mode,
                     34:                         recnum_t recnum,
                     35:                         io_buf_ptr_t data, unsigned int count,
                     36:                         int *bytes_written)
                     37: {
                     38:   return (adjust_recnum (dev, &recnum, count) ?:
                     39:          ds_device_write_inband (dev->com.blkpart.blk,
                     40:                                  reply_port, reply_port_type,
                     41:                                  mode, recnum, data, count, bytes_written));
                     42: }
                     43: 
                     44: 
                     45: io_return_t
                     46: ds_blkpart_read (device_t dev, ipc_port_t reply_port,
                     47:                 mach_msg_type_name_t reply_port_type, dev_mode_t mode,
                     48:                 recnum_t recnum, int count, io_buf_ptr_t *data,
                     49:                 unsigned *bytes_read)
                     50: {
                     51:   return (adjust_recnum (dev, &recnum, count) ?:
                     52:          ds_device_read (dev->com.blkpart.blk,
                     53:                          reply_port, reply_port_type,
                     54:                          mode, recnum, count, data, bytes_read));
                     55: }
                     56: 
                     57: io_return_t
                     58: ds_blkpart_read_inband (device_t dev, ipc_port_t reply_port,
                     59:                        mach_msg_type_name_t reply_port_type, dev_mode_t mode,
                     60:                        recnum_t recnum, int count, char *data,
                     61:                        unsigned *bytes_read)
                     62: {
                     63:   return (adjust_recnum (dev, &recnum, count) ?:
                     64:          ds_device_read_inband (dev->com.blkpart.blk,
                     65:                                 reply_port, reply_port_type,
                     66:                                 mode, recnum, count, data, bytes_read));
                     67: }
                     68: 
                     69: io_return_t
                     70: ds_blkpart_get_status (device_t dev, dev_flavor_t flavor, dev_status_t status,
                     71:                       mach_msg_type_number_t *status_count)
                     72: {
                     73:   switch (flavor)
                     74:     {
                     75:     case DEV_GET_SIZE:
                     76:       {
                     77:        status[DEV_GET_SIZE_RECORD_SIZE] = dev->com.blkpart.blk->com.blk.size;
                     78:        status[DEV_GET_SIZE_DEVICE_SIZE] = (dev->com.blkpart.blk->com.blk.size
                     79:                                            * dev->com.blkpart.part->size);
                     80:        *status_count = 2;
                     81:        return D_SUCCESS;
                     82:       }
                     83:     }
                     84:   INVALOP;
                     85: }
                     86: 
                     87: void
                     88: ds_blkpart_close (device_t dev)
                     89: {
                     90:   /* We store the partition pointer instead of a COM object here, so we'd
                     91:      better clear this field before returning to device_deallocate, which
                     92:      will attempt to call the COM release method.  */
                     93:   dev->com_device = 0;
                     94: 
                     95:   /* Release our ref on the underlying device.  */
                     96:   device_deallocate (dev->com.blkpart.blk);
                     97: }
                     98: 
                     99: const struct device_ops block_partition_device_ops =
                    100: {
                    101:   write_inband: ds_blkpart_write_inband, write: ds_blkpart_write,
                    102:   read_inband: ds_blkpart_read_inband, read: ds_blkpart_read,
                    103:   get_status: ds_blkpart_get_status,
                    104:   close: ds_blkpart_close
                    105: };

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