rtems_blkdev_read_ahead Struct Reference

Block device read-ahead control. More...

#include <diskdevs.h>

Data Fields
rtems_chain_node	node
	Chain node for the read-ahead request queue of the read-ahead task.
rtems_blkdev_bnum	trigger
	Block value to trigger the read-ahead request.
rtems_blkdev_bnum	next
	Start block for the next read-ahead request.
uint32_t	nr_blocks
	Size of the next read-ahead request in blocks.

Detailed Description

Block device read-ahead control.

Field Documentation

next

rtems_blkdev_bnum rtems_blkdev_read_ahead::next

Start block for the next read-ahead request.

In case the trigger value is out of range of valid blocks, this value my be arbitrary.

nr_blocks

uint32_t rtems_blkdev_read_ahead::nr_blocks

Size of the next read-ahead request in blocks.

A value of RTEMS_DISK_READ_AHEAD_SIZE_AUTO will try to read the rest of the disk but at most the configured max_read_ahead_blocks.

trigger

rtems_blkdev_bnum rtems_blkdev_read_ahead::trigger

Block value to trigger the read-ahead request.

A value of RTEMS_DISK_READ_AHEAD_NO_TRIGGER will disable further read-ahead requests (except the ones triggered by rtems_bdbuf_peek) since no valid block can have this value.

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The documentation for this struct was generated from the following file:

• cpukit/include/rtems/diskdevs.h