fs/jfs/file.c

File Facts

System

Linux kernel

Corpus path

fs/jfs/file.c

Extension

.c

Size

4073 bytes

Lines

159

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/mm.h
• linux/fs.h
• linux/filelock.h
• linux/posix_acl.h
• linux/quotaops.h
• jfs_incore.h
• jfs_inode.h
• jfs_dmap.h
• jfs_txnmgr.h
• jfs_xattr.h
• jfs_acl.h
• jfs_debug.h

Detected Declarations

• function Copyright
• function jfs_open
• function jfs_release
• function jfs_setattr

Annotated Snippet

const struct file_operations jfs_file_operations = {
	.open		= jfs_open,
	.llseek		= generic_file_llseek,
	.read_iter	= generic_file_read_iter,
	.write_iter	= generic_file_write_iter,
	.mmap_prepare	= generic_file_mmap_prepare,
	.splice_read	= filemap_splice_read,
	.splice_write	= iter_file_splice_write,
	.fsync		= jfs_fsync,
	.release	= jfs_release,
	.unlocked_ioctl = jfs_ioctl,
	.compat_ioctl	= compat_ptr_ioctl,
	.setlease	= generic_setlease,
};

Annotation

• Immediate include surface: `linux/mm.h`, `linux/fs.h`, `linux/filelock.h`, `linux/posix_acl.h`, `linux/quotaops.h`, `jfs_incore.h`, `jfs_inode.h`, `jfs_dmap.h`.
• Detected declarations: `function Copyright`, `function jfs_open`, `function jfs_release`, `function jfs_setattr`.
• 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.