include/linux/ext2_fs.h

File Facts

System

Linux kernel

Corpus path

include/linux/ext2_fs.h

Extension

.h

Size

967 bytes

Lines

44

Domain

Core OS

Bucket

Core Kernel Interface

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.

Dependency Surface

• linux/types.h
• linux/magic.h

Detected Declarations

• function Copyright

Annotated Snippet

#ifndef _LINUX_EXT2_FS_H
#define _LINUX_EXT2_FS_H

#include <linux/types.h>
#include <linux/magic.h>

#define EXT2_NAME_LEN 255

/*
 * Maximal count of links to a file
 */
#define EXT2_LINK_MAX		32000

#define EXT2_SB_MAGIC_OFFSET	0x38
#define EXT2_SB_BLOCKS_OFFSET	0x04
#define EXT2_SB_BSIZE_OFFSET	0x18

static inline u64 ext2_image_size(void *ext2_sb)
{
	__u8 *p = ext2_sb;
	if (*(__le16 *)(p + EXT2_SB_MAGIC_OFFSET) != cpu_to_le16(EXT2_SUPER_MAGIC))
		return 0;
	return (u64)le32_to_cpup((__le32 *)(p + EXT2_SB_BLOCKS_OFFSET)) <<
		le32_to_cpup((__le32 *)(p + EXT2_SB_BSIZE_OFFSET));
}

#endif	/* _LINUX_EXT2_FS_H */

Annotation

• Immediate include surface: `linux/types.h`, `linux/magic.h`.
• Detected declarations: `function Copyright`.
• Atlas domain: Core OS / Core Kernel Interface.
• 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.