fs/nilfs2/file.c

File Facts

System

Linux kernel

Corpus path

fs/nilfs2/file.c

Extension

.c

Size

4162 bytes

Lines

166

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/filelock.h
• linux/mm.h
• linux/writeback.h
• nilfs.h
• segment.h

Detected Declarations

• function fsync
• function nilfs_page_mkwrite
• function folio_pos
• function nilfs_file_mmap_prepare

Annotated Snippet

const struct file_operations nilfs_file_operations = {
	.llseek		= generic_file_llseek,
	.read_iter	= generic_file_read_iter,
	.write_iter	= generic_file_write_iter,
	.unlocked_ioctl	= nilfs_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl	= nilfs_compat_ioctl,
#endif	/* CONFIG_COMPAT */
	.mmap_prepare	= nilfs_file_mmap_prepare,
	.open		= generic_file_open,
	/* .release	= nilfs_release_file, */
	.fsync		= nilfs_sync_file,
	.splice_read	= filemap_splice_read,
	.splice_write   = iter_file_splice_write,
	.setlease	= generic_setlease,
};

const struct inode_operations nilfs_file_inode_operations = {
	.setattr	= nilfs_setattr,
	.permission     = nilfs_permission,
	.fiemap		= nilfs_fiemap,
	.fileattr_get	= nilfs_fileattr_get,
	.fileattr_set	= nilfs_fileattr_set,
};

/* end of file */

Annotation

• Immediate include surface: `linux/fs.h`, `linux/filelock.h`, `linux/mm.h`, `linux/writeback.h`, `nilfs.h`, `segment.h`.
• Detected declarations: `function fsync`, `function nilfs_page_mkwrite`, `function folio_pos`, `function nilfs_file_mmap_prepare`.
• 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.