fs/efs/file.c

File Facts

System

Linux kernel

Corpus path

fs/efs/file.c

Extension

.c

Size

792 bytes

Lines

43

Domain

Core OS

Bucket

VFS And Filesystem Core

Inferred role

Core OS: implementation source

Status

source implementation candidate

Why This File Exists

Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.

• Core operating-system implementation surface: boot, tasks, memory, VFS, syscall-facing interfaces, synchronization, credentials, and isolation.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/buffer_head.h
• efs.h

Detected Declarations

• function Copyright
• function efs_bmap

Annotated Snippet

int efs_bmap(struct inode *inode, efs_block_t block) {

	if (block < 0) {
		pr_warn("%s(): block < 0\n", __func__);
		return 0;
	}

	/* are we about to read past the end of a file ? */
	if (!(block < inode->i_blocks))
		return 0;

	return efs_map_block(inode, block);
}

Annotation

• Immediate include surface: `linux/buffer_head.h`, `efs.h`.
• Detected declarations: `function Copyright`, `function efs_bmap`.
• Atlas domain: Core OS / VFS And Filesystem Core.
• 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.