Chapter 14. Block Devices
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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