Chapter 16. Block Devices
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Chapter 16. Block Devices
Table of Contents
blk_get_backing_dev_info
— get the address of a queue's backing_dev_info
generic_unplug_device
— fire a request queue
blk_start_queue
— restart a previously stopped queue
blk_stop_queue
— stop a queue
blk_sync_queue
— cancel any pending callbacks on a queue
__blk_run_queue
— run a single device queue
blk_run_queue
— run a single device queue
blk_init_queue
— prepare a request queue for use with a block device
blk_start_queueing
— initiate dispatch of requests to device
blk_requeue_request
— put a request back on queue
blk_insert_request
— insert a special request in to a request queue
submit_bio
—
blk_complete_request
— end I/O on a request
blk_rq_bytes
— Returns bytes left to complete in the entire request
blk_rq_cur_bytes
— Returns bytes left to complete in the current segment
end_queued_request
— end all I/O on a queued request
end_dequeued_request
— end all I/O on a dequeued request
end_request
— end I/O on the current segment of the request
blk_end_request
— Helper function for drivers to complete the request.
__blk_end_request
— Helper function for drivers to complete the request.
blk_end_bidi_request
— Helper function for drivers to complete bidi request.
blk_end_request_callback
— Special helper function for tricky drivers
__generic_make_request
—
__end_that_request_first
— end I/O on a request
blk_end_io
— Generic end_io function to complete a request.
blk_rq_map_user
— map user data to a request, for REQ_BLOCK_PC usage
blk_rq_unmap_user
— unmap a request with user data
blk_rq_map_kern
— map kernel data to a request, for REQ_BLOCK_PC usage
blk_release_queue
— release a
struct request_queue
when it is no longer needed
blk_queue_prep_rq
— set a prepare_request function for queue
blk_queue_merge_bvec
— set a merge_bvec function for queue
blk_queue_make_request
— define an alternate make_request function for a device
blk_queue_bounce_limit
— set bounce buffer limit for queue
blk_queue_max_sectors
— set max sectors for a request for this queue
blk_queue_max_phys_segments
— set max phys segments for a request for this queue
blk_queue_max_hw_segments
— set max hw segments for a request for this queue
blk_queue_max_segment_size
— set max segment size for blk_rq_map_sg
blk_queue_hardsect_size
— set hardware sector size for the queue
blk_queue_stack_limits
— inherit underlying queue limits for stacked drivers
blk_queue_dma_pad
— set pad mask
blk_queue_dma_drain
— Set up a drain buffer for excess dma.
blk_queue_segment_boundary
— set boundary rules for segment merging
blk_queue_dma_alignment
— set dma length and memory alignment
blk_queue_update_dma_alignment
— update dma length and memory alignment
blk_end_sync_rq
— executes a completion event on a request
blk_execute_rq_nowait
— insert a request into queue for execution
blk_execute_rq
— insert a request into queue for execution
blk_queue_ordered
— does this queue support ordered writes
blkdev_issue_flush
— queue a flush
blk_queue_find_tag
— find a request by its tag and queue
blk_free_tags
— release a given set of tag maintenance info
blk_queue_free_tags
— release tag maintenance info
blk_init_tags
— initialize the tag info for an external tag map
blk_queue_init_tags
— initialize the queue tag info
blk_queue_resize_tags
— change the queueing depth
blk_queue_end_tag
— end tag operations for a request
blk_queue_start_tag
— find a free tag and assign it
blk_queue_invalidate_tags
— invalidate all pending tags
__blk_free_tags
— release a given set of tag maintenance info
__blk_queue_free_tags
— release tag maintenance info