drivers/md/dm-log.c

File Facts

System

Linux kernel

Corpus path

drivers/md/dm-log.c

Extension

.c

Size

20508 bytes

Lines

917

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

• linux/init.h
• linux/slab.h
• linux/module.h
• linux/vmalloc.h
• linux/dm-io.h
• linux/dm-dirty-log.h
• linux/device-mapper.h

Detected Declarations

• struct log_header_disk
• struct log_header_core
• struct log_c
• enum sync
• function put_type
• function dm_dirty_log_type_register
• function dm_dirty_log_type_unregister
• function int
• function dm_dirty_log_destroy
• function log_test_bit
• function log_set_bit
• function log_clear_bit
• function header_to_disk
• function header_from_disk
• function rw_header
• function flush_header
• function read_header
• function _check_region_size
• function create_log_context
• function core_ctr
• function destroy_log_context
• function core_dtr
• function disk_ctr
• function disk_dtr
• function fail_log_device
• function disk_resume
• function core_get_region_size
• function core_resume
• function core_is_clean
• function core_in_sync
• function core_flush
• function disk_flush
• function core_mark_region
• function core_clear_region
• function core_get_resync_work
• function core_set_region_sync
• function core_get_sync_count
• function core_status
• function disk_status
• function dm_dirty_log_init
• function dm_dirty_log_exit
• module init dm_dirty_log_init
• export dm_dirty_log_type_register
• export dm_dirty_log_type_unregister
• export dm_dirty_log_create
• export dm_dirty_log_destroy

Annotated Snippet

module_init(dm_dirty_log_init);
module_exit(dm_dirty_log_exit);

MODULE_DESCRIPTION(DM_NAME " dirty region log");
MODULE_AUTHOR("Joe Thornber, Heinz Mauelshagen <dm-devel@lists.linux.dev>");
MODULE_LICENSE("GPL");

Annotation

• Immediate include surface: `linux/init.h`, `linux/slab.h`, `linux/module.h`, `linux/vmalloc.h`, `linux/dm-io.h`, `linux/dm-dirty-log.h`, `linux/device-mapper.h`.
• Detected declarations: `struct log_header_disk`, `struct log_header_core`, `struct log_c`, `enum sync`, `function put_type`, `function dm_dirty_log_type_register`, `function dm_dirty_log_type_unregister`, `function int`, `function dm_dirty_log_destroy`, `function log_test_bit`.
• 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.