drivers/block/null_blk/trace.c

File Facts

System

Linux kernel

Corpus path

drivers/block/null_blk/trace.c

Extension

.c

Size

455 bytes

Lines

22

Domain

Driver Families

Bucket

drivers/block

Inferred role

Driver Families: implementation source

Status

source 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.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• trace.h

Detected Declarations

• function Copyright

Annotated Snippet

// SPDX-License-Identifier: GPL-2.0
/*
 * null_blk trace related helpers.
 *
 * Copyright (C) 2020 Western Digital Corporation or its affiliates.
 */
#include "trace.h"

/*
 * Helper to use for all null_blk traces to extract disk name.
 */
const char *nullb_trace_disk_name(struct trace_seq *p, char *name)
{
	const char *ret = trace_seq_buffer_ptr(p);

	if (name && *name)
		trace_seq_printf(p, "disk=%s, ", name);
	trace_seq_putc(p, 0);

	return ret;
}

Annotation

• Immediate include surface: `trace.h`.
• Detected declarations: `function Copyright`.
• Atlas domain: Driver Families / drivers/block.
• Implementation status: source implementation candidate.

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.