fs/kernfs/dir.c

File Facts

System

Linux kernel

Corpus path

fs/kernfs/dir.c

Extension

.c

Size

53482 bytes

Lines

2016

Domain

Core OS

Bucket

VFS And Filesystem Core

Inferred role

Core OS: operation-table or driver-model contract

Status

pattern 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 an operation table; this is where Linux turns generic core objects into subsystem-specific behavior.
• 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/sched.h
• linux/fs.h
• linux/namei.h
• linux/idr.h
• linux/slab.h
• linux/security.h
• linux/hash.h
• linux/ns_common.h
• kernfs-internal.h

Detected Declarations

• function __kernfs_active
• function kernfs_active
• function kernfs_lockdep
• function kernfs_depth
• function kernfs_path_from_node_locked
• function strscpy
• function path
• function pr_cont_kernfs_name
• function pr_cont_kernfs_path
• function kernfs_ns_id
• function kernfs_name_hash
• function kernfs_name_compare
• function kernfs_sd_compare
• function kernfs_link_sibling
• function kernfs_unlink_sibling
• function kernfs_put_active
• function kernfs_drain
• function kernfs_get
• function kernfs_free_rcu
• function kernfs_put
• function kernfs_add_one
• function kernfs_root_flags
• function kernfs_destroy_root
• function kernfs_dop_revalidate
• function kernfs_iop_rmdir
• function kernfs_iop_rename
• function kernfs_activate_one
• function kernfs_activate
• function kernfs_show
• function files
• function list_for_each_entry
• function __kernfs_remove
• function kernfs_unlink_sibling
• function kernfs_remove
• function kernfs_unbreak_active_protection
• function kernfs_break_active_protection
• function kernfs_remove_self
• function kernfs_remove_self
• function kernfs_remove_by_name_ns
• function kernfs_rename_ns
• function kernfs_dir_fop_release
• function kernfs_ns_id
• function kernfs_fop_readdir
• export kernfs_path_from_node
• export kernfs_get
• export kernfs_put
• export kernfs_find_and_get_ns

Annotated Snippet

const struct file_operations kernfs_dir_fops = {
	.read		= generic_read_dir,
	.iterate_shared	= kernfs_fop_readdir,
	.release	= kernfs_dir_fop_release,
	.llseek		= generic_file_llseek,
};

Annotation

• Immediate include surface: `linux/sched.h`, `linux/fs.h`, `linux/namei.h`, `linux/idr.h`, `linux/slab.h`, `linux/security.h`, `linux/hash.h`, `linux/ns_common.h`.
• Detected declarations: `function __kernfs_active`, `function kernfs_active`, `function kernfs_lockdep`, `function kernfs_depth`, `function kernfs_path_from_node_locked`, `function strscpy`, `function path`, `function pr_cont_kernfs_name`, `function pr_cont_kernfs_path`, `function kernfs_ns_id`.
• Atlas domain: Core OS / VFS And Filesystem Core.
• Implementation status: pattern 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.