drivers/md/dm-cache-target.c

File Facts

System

Linux kernel

Corpus path

drivers/md/dm-cache-target.c

Extension

.c

Size

88220 bytes

Lines

3613

Domain

Driver Families

Bucket

drivers/md

Inferred role

Driver Families: exported/initcall integration point

Status

integration implementation candidate

Why This File Exists

Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.

• Repeatable hardware-adapter layer. Deep compatibility for every driver is out of scope; this atlas records patterns, probe lifecycles, bus glue, IRQ/DMA usage, and links back to core abstractions.
• Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.
• Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
• Allocates kernel memory; connect allocation flags and lifetime to context constraints.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• dm.h
• dm-bio-prison-v2.h
• dm-bio-record.h
• dm-cache-metadata.h
• dm-io-tracker.h
• dm-cache-background-tracker.h
• linux/dm-io.h
• linux/dm-kcopyd.h
• linux/jiffies.h
• linux/init.h
• linux/mempool.h
• linux/module.h
• linux/rwsem.h
• linux/slab.h
• linux/vmalloc.h

Detected Declarations

• struct continuation
• struct batcher
• struct dm_hook_info
• struct cache_features
• struct cache_stats
• struct cache
• struct per_bio_data
• struct dm_cache_migration
• struct cache_args
• struct discard_load_info
• struct cblock_range
• enum cache_metadata_mode
• enum cache_io_mode
• enum busy
• function init_continuation
• function queue_continuation
• function __commit
• function list_for_each_entry_safe
• function batcher_init
• function async_commit
• function continue_after_commit
• function issue_after_commit
• function schedule_commit
• function dm_hook_bio
• function dm_unhook_bio
• function writethrough_mode
• function writeback_mode
• function passthrough_mode
• function wake_deferred_bio_worker
• function wake_migration_worker
• function free_prison_cell
• function free_migration
• function oblock_succ
• function build_key
• function lock_level
• function defer_bio
• function defer_bios
• function bio_detain_shared
• function is_dirty
• function set_dirty
• function force_set_dirty
• function force_clear_dirty
• function block_size_is_power_of_two
• function block_div
• function oblocks_per_dblock
• function oblock_to_dblock
• function set_discard
• function clear_discard

Annotated Snippet

module_init(dm_cache_init);
module_exit(dm_cache_exit);

MODULE_DESCRIPTION(DM_NAME " cache target");
MODULE_AUTHOR("Joe Thornber <ejt@redhat.com>");
MODULE_LICENSE("GPL");

Annotation

• Immediate include surface: `dm.h`, `dm-bio-prison-v2.h`, `dm-bio-record.h`, `dm-cache-metadata.h`, `dm-io-tracker.h`, `dm-cache-background-tracker.h`, `linux/dm-io.h`, `linux/dm-kcopyd.h`.
• Detected declarations: `struct continuation`, `struct batcher`, `struct dm_hook_info`, `struct cache_features`, `struct cache_stats`, `struct cache`, `struct per_bio_data`, `struct dm_cache_migration`, `struct cache_args`, `struct discard_load_info`.
• Atlas domain: Driver Families / drivers/md.
• Implementation status: integration implementation candidate.
• Synchronization appears in or near this file; preserve lock ordering, sleepability, and interrupt-context constraints.

Implementation Notes

• This generated page is the file-by-file coverage layer; curated subsystem chapters should link here when they synthesize a multi-file control flow.
• Core OS pages should be promoted from atlas-only to deep-reviewed when they explain data structures, invariants, locking, lifecycle, and C implementation snippets.
• Driver-family pages are intentionally pattern-oriented unless they are part of the selected PCIe/NVMe representative device path.