fs/isofs/export.c

File Facts

System

Linux kernel

Corpus path

fs/isofs/export.c

Extension

.c

Size

5309 bytes

Lines

194

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

• isofs.h

Detected Declarations

• struct isofs_fid
• function iget
• function isofs_normalize_block_and_offset
• function isofs_export_encode_fh

Annotated Snippet

struct isofs_fid {
	u32 block;
	u16 offset;
	u16 parent_offset;
	u32 generation;
	u32 parent_block;
	u32 parent_generation;
};

static struct dentry *isofs_fh_to_dentry(struct super_block *sb,
	struct fid *fid, int fh_len, int fh_type)
{
	struct isofs_fid *ifid = (struct isofs_fid *)fid;

	if (fh_len < 3 || fh_type > 2)
		return NULL;

	return isofs_export_iget(sb, ifid->block, ifid->offset,
			ifid->generation);
}

static struct dentry *isofs_fh_to_parent(struct super_block *sb,
		struct fid *fid, int fh_len, int fh_type)
{
	struct isofs_fid *ifid = (struct isofs_fid *)fid;

	if (fh_len < 2 || fh_type != 2)
		return NULL;

	return isofs_export_iget(sb,
			fh_len > 3 ? ifid->parent_block : 0,
			ifid->parent_offset,
			fh_len > 4 ? ifid->parent_generation : 0);
}

const struct export_operations isofs_export_ops = {
	.encode_fh	= isofs_export_encode_fh,
	.fh_to_dentry	= isofs_fh_to_dentry,
	.fh_to_parent	= isofs_fh_to_parent,
	.get_parent     = isofs_export_get_parent,
};

Annotation

• Immediate include surface: `isofs.h`.
• Detected declarations: `struct isofs_fid`, `function iget`, `function isofs_normalize_block_and_offset`, `function isofs_export_encode_fh`.
• 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.