fs/nfs/nfs4file.c

File Facts

System

Linux kernel

Corpus path

fs/nfs/nfs4file.c

Extension

.c

Size

11149 bytes

Lines

460

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

• linux/fs.h
• linux/file.h
• linux/falloc.h
• linux/mount.h
• linux/nfs_fs.h
• linux/nfs_ssc.h
• linux/splice.h
• delegation.h
• internal.h
• iostat.h
• fscache.h
• pnfs.h
• nfstrace.h
• nfs42.h

Detected Declarations

• function Copyright
• function nfs4_file_flush
• function __nfs4_copy_file_range
• function nfs4_copy_file_range
• function nfs4_file_llseek
• function nfs42_fallocate
• function nfs42_remap_file_range
• function __nfs42_ssc_close
• function nfs42_ssc_register_ops
• function nfs42_ssc_unregister_ops
• function nfs4_setlease

Annotated Snippet

const struct file_operations nfs4_file_operations = {
	.read_iter	= nfs_file_read,
	.write_iter	= nfs_file_write,
	.mmap_prepare	= nfs_file_mmap_prepare,
	.open		= nfs4_file_open,
	.flush		= nfs4_file_flush,
	.release	= nfs_file_release,
	.fsync		= nfs_file_fsync,
	.lock		= nfs_lock,
	.flock		= nfs_flock,
	.splice_read	= nfs_file_splice_read,
	.splice_write	= iter_file_splice_write,
	.check_flags	= nfs_check_flags,
	.setlease	= nfs4_setlease,
#ifdef CONFIG_NFS_V4_2
	.copy_file_range = nfs4_copy_file_range,
	.llseek		= nfs4_file_llseek,
	.fallocate	= nfs42_fallocate,
	.remap_file_range = nfs42_remap_file_range,
#else
	.llseek		= nfs_file_llseek,
#endif
	.fop_flags	= FOP_DONTCACHE,
};

Annotation

• Immediate include surface: `linux/fs.h`, `linux/file.h`, `linux/falloc.h`, `linux/mount.h`, `linux/nfs_fs.h`, `linux/nfs_ssc.h`, `linux/splice.h`, `delegation.h`.
• Detected declarations: `function Copyright`, `function nfs4_file_flush`, `function __nfs4_copy_file_range`, `function nfs4_copy_file_range`, `function nfs4_file_llseek`, `function nfs42_fallocate`, `function nfs42_remap_file_range`, `function __nfs42_ssc_close`, `function nfs42_ssc_register_ops`, `function nfs42_ssc_unregister_ops`.
• 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.