drivers/md/dm-ps-io-affinity.c

File Facts

System

Linux kernel

Corpus path

drivers/md/dm-ps-io-affinity.c

Extension

.c

Size

5268 bytes

Lines

271

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-path-selector.h
• linux/device-mapper.h
• linux/module.h

Detected Declarations

• struct path_info
• struct selector
• function ioa_free_path
• function ioa_add_path
• function for_each_cpu
• function ioa_create
• function ioa_destroy
• function ioa_status
• function ioa_fail_path
• function ioa_reinstate_path
• function for_each_cpu
• function dm_ioa_init
• function dm_ioa_exit
• module init dm_ioa_init

Annotated Snippet

module_init(dm_ioa_init);
module_exit(dm_ioa_exit);

MODULE_DESCRIPTION(DM_NAME " multipath path selector that selects paths based on the CPU IO is being executed on");
MODULE_AUTHOR("Mike Christie <michael.christie@oracle.com>");
MODULE_LICENSE("GPL");

Annotation

• Immediate include surface: `dm-path-selector.h`, `linux/device-mapper.h`, `linux/module.h`.
• Detected declarations: `struct path_info`, `struct selector`, `function ioa_free_path`, `function ioa_add_path`, `function for_each_cpu`, `function ioa_create`, `function ioa_destroy`, `function ioa_status`, `function ioa_fail_path`, `function ioa_reinstate_path`.
• 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.