Chapter 14. Block Devices

Table of Contents

blk_get_backing_dev_info - get the address of a queue's backing_dev_info
blk_delay_queue - restart queueing after defined interval
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_async - run a single device queue in workqueue context
blk_run_queue - run a single device queue
blk_init_queue - prepare a request queue for use with a block device
blk_make_request - given a bio, allocate a corresponding struct request.
blk_requeue_request - put a request back on queue
blk_insert_request - insert a special request into a request queue
part_round_stats - Round off the performance stats on a struct disk_stats.
blk_add_request_payload - add a payload to a request
submit_bio - submit a bio to the block device layer for I/O
blk_rq_check_limits - Helper function to check a request for the queue limit
blk_insert_cloned_request - Helper for stacking drivers to submit a request
blk_rq_err_bytes - determine number of bytes till the next failure boundary
blk_peek_request - peek at the top of a request queue
blk_start_request - start request processing on the driver
blk_fetch_request - fetch a request from a request queue
blk_update_request - Special helper function for request stacking drivers
blk_unprep_request - unprepare a request
blk_end_request - Helper function for drivers to complete the request.
blk_end_request_all - Helper function for drives to finish the request.
blk_end_request_cur - Helper function to finish the current request chunk.
blk_end_request_err - Finish a request till the next failure boundary.
__blk_end_request - Helper function for drivers to complete the request.
__blk_end_request_all - Helper function for drives to finish the request.
__blk_end_request_cur - Helper function to finish the current request chunk.
__blk_end_request_err - Finish a request till the next failure boundary.
rq_flush_dcache_pages - Helper function to flush all pages in a request
blk_lld_busy - Check if underlying low-level drivers of a device are busy
blk_rq_unprep_clone - Helper function to free all bios in a cloned request
blk_rq_prep_clone - Helper function to setup clone request
__generic_make_request - hand a buffer to its device driver for I/O
blk_end_bidi_request - Complete a bidi request
__blk_end_bidi_request - Complete a bidi request with queue lock held
blk_rq_map_user - map user data to a request, for REQ_TYPE_BLOCK_PC usage
blk_rq_map_user_iov - map user data to a request, for REQ_TYPE_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_TYPE_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_unprep_rq - set an unprepare_request function for queue
blk_queue_merge_bvec - set a merge_bvec function for queue
blk_set_default_limits - reset limits to default values
blk_queue_make_request - define an alternate make_request function for a device
blk_queue_bounce_limit - set bounce buffer limit for queue
blk_limits_max_hw_sectors - set hard and soft limit of max sectors for request
blk_queue_max_hw_sectors - set max sectors for a request for this queue
blk_queue_max_discard_sectors - set max sectors for a single discard
blk_queue_max_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_logical_block_size - set logical block size for the queue
blk_queue_physical_block_size - set physical block size for the queue
blk_queue_alignment_offset - set physical block alignment offset
blk_limits_io_min - set minimum request size for a device
blk_queue_io_min - set minimum request size for the queue
blk_limits_io_opt - set optimal request size for a device
blk_queue_io_opt - set optimal request size for the queue
blk_queue_stack_limits - inherit underlying queue limits for stacked drivers
blk_stack_limits - adjust queue_limits for stacked devices
bdev_stack_limits - adjust queue limits for stacked drivers
disk_stack_limits - adjust queue limits for stacked drivers
blk_queue_dma_pad - set pad mask
blk_queue_update_dma_pad - update 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_queue_flush - configure queue's cache flush capability
blk_execute_rq_nowait - insert a request into queue for execution
blk_execute_rq - insert a request into queue for execution
blkdev_issue_flush - queue a flush
blkdev_issue_discard - queue a discard
blkdev_issue_zeroout - generate number of zero filed write bios
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
blk_rq_count_integrity_sg - Count number of integrity scatterlist elements
blk_rq_map_integrity_sg - Map integrity metadata into a scatterlist
blk_integrity_compare - Compare integrity profile of two disks
blk_integrity_register - Register a gendisk as being integrity-capable
blk_integrity_unregister - Remove block integrity profile
blk_trace_ioctl - handle the ioctls associated with tracing
blk_trace_shutdown - stop and cleanup trace structures
blk_add_trace_rq - Add a trace for a request oriented action
blk_add_trace_bio - Add a trace for a bio oriented action
blk_add_trace_bio_remap - Add a trace for a bio-remap operation
blk_add_trace_rq_remap - Add a trace for a request-remap operation
blk_mangle_minor - scatter minor numbers apart
blk_alloc_devt - allocate a dev_t for a partition
blk_free_devt - free a dev_t
disk_replace_part_tbl - replace disk->part_tbl in RCU-safe way
disk_expand_part_tbl - expand disk->part_tbl
disk_block_events - block and flush disk event checking
disk_unblock_events - unblock disk event checking
disk_clear_events - synchronously check, clear and return pending events
disk_get_part - get partition
disk_part_iter_init - initialize partition iterator
disk_part_iter_next - proceed iterator to the next partition and return it
disk_part_iter_exit - finish up partition iteration
disk_map_sector_rcu - map sector to partition
register_blkdev - register a new block device
add_disk - add partitioning information to kernel list
get_gendisk - get partitioning information for a given device
bdget_disk - do bdget by gendisk and partition number
disk_check_events - schedule immediate event checking