fs/ext2/dir.c

File Facts

System

Linux kernel

Corpus path

fs/ext2/dir.c

Extension

.c

Size

18916 bytes

Lines

740

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.
• 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

• ext2.h
• linux/buffer_head.h
• linux/filelock.h
• linux/pagemap.h
• linux/swap.h
• linux/iversion.h

Detected Declarations

• function ext2_rec_len_from_disk
• function ext2_rec_len_to_disk
• function ext2_chunk_size
• function ext2_last_byte
• function ext2_commit_chunk
• function ext2_check_folio
• function ext2_get_folio
• function ext2_match
• function ext2_validate_entry
• function ext2_set_de_type
• function ext2_readdir
• function ext2_find_entry
• function folio_release_kmap
• function ext2_inode_by_name
• function ext2_prepare_chunk
• function ext2_handle_dirsync
• function ext2_set_link
• function ext2_add_link
• function ext2_delete_entry
• function ext2_make_empty
• function empty
• function ext2_dir_open
• function ext2_dir_release
• function ext2_dir_llseek

Annotated Snippet

const struct file_operations ext2_dir_operations = {
	.open		= ext2_dir_open,
	.release	= ext2_dir_release,
	.llseek		= ext2_dir_llseek,
	.read		= generic_read_dir,
	.iterate_shared	= ext2_readdir,
	.unlocked_ioctl = ext2_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl	= ext2_compat_ioctl,
#endif
	.fsync		= ext2_fsync,
	.setlease	= generic_setlease,
};

Annotation

• Immediate include surface: `ext2.h`, `linux/buffer_head.h`, `linux/filelock.h`, `linux/pagemap.h`, `linux/swap.h`, `linux/iversion.h`.
• Detected declarations: `function ext2_rec_len_from_disk`, `function ext2_rec_len_to_disk`, `function ext2_chunk_size`, `function ext2_last_byte`, `function ext2_commit_chunk`, `function ext2_check_folio`, `function ext2_get_folio`, `function ext2_match`, `function ext2_validate_entry`, `function ext2_set_de_type`.
• Atlas domain: Core OS / VFS And Filesystem Core.
• Implementation status: pattern 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.