fs/ext2/file.c

File Facts

System

Linux kernel

Corpus path

fs/ext2/file.c

Extension

.c

Size

6184 bytes

Lines

233

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.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/time.h
• linux/pagemap.h
• linux/filelock.h
• linux/quotaops.h
• linux/iomap.h
• linux/uio.h
• linux/buffer_head.h
• ext2.h
• xattr.h
• acl.h
• trace.h

Detected Declarations

• function Copyright
• function ext2_fsync
• function ext2_dio_read_iter
• function ext2_dio_write_end_io
• function ext2_dio_write_iter
• function ext2_file_read_iter
• function ext2_file_write_iter
• function ext2_file_open

Annotated Snippet

const struct file_operations ext2_file_operations = {
	.llseek		= generic_file_llseek,
	.read_iter	= ext2_file_read_iter,
	.write_iter	= ext2_file_write_iter,
	.unlocked_ioctl = ext2_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl	= ext2_compat_ioctl,
#endif
	.mmap_prepare	= generic_file_mmap_prepare,
	.open		= ext2_file_open,
	.release	= ext2_release_file,
	.fsync		= ext2_fsync,
	.get_unmapped_area = thp_get_unmapped_area,
	.splice_read	= filemap_splice_read,
	.splice_write	= iter_file_splice_write,
	.setlease	= generic_setlease,
};

const struct inode_operations ext2_file_inode_operations = {
	.listxattr	= ext2_listxattr,
	.getattr	= ext2_getattr,
	.setattr	= ext2_setattr,
	.get_inode_acl	= ext2_get_acl,
	.set_acl	= ext2_set_acl,
	.fiemap		= ext2_fiemap,
	.fileattr_get	= ext2_fileattr_get,
	.fileattr_set	= ext2_fileattr_set,
};

Annotation

• Immediate include surface: `linux/time.h`, `linux/pagemap.h`, `linux/filelock.h`, `linux/quotaops.h`, `linux/iomap.h`, `linux/uio.h`, `linux/buffer_head.h`, `ext2.h`.
• Detected declarations: `function Copyright`, `function ext2_fsync`, `function ext2_dio_read_iter`, `function ext2_dio_write_end_io`, `function ext2_dio_write_iter`, `function ext2_file_read_iter`, `function ext2_file_write_iter`, `function ext2_file_open`.
• 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.