drivers/block/brd.c

File Facts

System

Linux kernel

Corpus path

drivers/block/brd.c

Extension

.c

Size

10152 bytes

Lines

444

Domain

Driver Families

Bucket

drivers/block

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/initrd.h
• linux/module.h
• linux/moduleparam.h
• linux/major.h
• linux/blkdev.h
• linux/bio.h
• linux/highmem.h
• linux/mutex.h
• linux/pagemap.h
• linux/xarray.h
• linux/fs.h
• linux/slab.h
• linux/backing-dev.h
• linux/debugfs.h
• linux/uaccess.h

Detected Declarations

• struct brd_device
• function brd_free_pages
• function xa_for_each
• function brd_rw_bvec
• function brd_do_discard
• function brd_submit_bio
• function ramdisk_size
• function brd_free_device
• function brd_alloc
• function brd_probe
• function brd_cleanup
• function list_for_each_entry_safe
• function brd_check_and_reset_par
• function brd_init
• function brd_exit
• module init brd_init

Annotated Snippet

module_init(brd_init);
module_exit(brd_exit);

Annotation

• Immediate include surface: `linux/init.h`, `linux/initrd.h`, `linux/module.h`, `linux/moduleparam.h`, `linux/major.h`, `linux/blkdev.h`, `linux/bio.h`, `linux/highmem.h`.
• Detected declarations: `struct brd_device`, `function brd_free_pages`, `function xa_for_each`, `function brd_rw_bvec`, `function brd_do_discard`, `function brd_submit_bio`, `function ramdisk_size`, `function brd_free_device`, `function brd_alloc`, `function brd_probe`.
• Atlas domain: Driver Families / drivers/block.
• 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.