fs/9p/vfs_file.c

File Facts

System

Linux kernel

Corpus path

fs/9p/vfs_file.c

Extension

.c

Size

12962 bytes

Lines

535

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

Dependency Surface

• linux/module.h
• linux/errno.h
• linux/fs.h
• linux/filelock.h
• linux/sched.h
• linux/file.h
• linux/stat.h
• linux/string.h
• linux/list.h
• linux/pagemap.h
• linux/utsname.h
• linux/uaccess.h
• linux/uio.h
• linux/slab.h
• net/9p/9p.h
• net/9p/client.h
• v9fs.h
• v9fs_vfs.h
• fid.h
• cache.h

Detected Declarations

• function v9fs_file_open
• function v9fs_file_lock
• function v9fs_file_do_lock
• function v9fs_file_getlock
• function v9fs_file_lock_dotl
• function v9fs_file_flock_dotl
• function v9fs_file_read_iter
• function v9fs_file_splice_read
• function v9fs_file_write_iter
• function v9fs_file_fsync
• function v9fs_file_fsync_dotl
• function v9fs_file_mmap_prepare
• function v9fs_vm_page_mkwrite
• function v9fs_mmap_vm_close

Annotated Snippet

const struct file_operations v9fs_file_operations = {
	.llseek = generic_file_llseek,
	.read_iter = v9fs_file_read_iter,
	.write_iter = v9fs_file_write_iter,
	.open = v9fs_file_open,
	.release = v9fs_dir_release,
	.lock = v9fs_file_lock,
	.mmap_prepare = generic_file_readonly_mmap_prepare,
	.splice_read = v9fs_file_splice_read,
	.splice_write = iter_file_splice_write,
	.fsync = v9fs_file_fsync,
};

const struct file_operations v9fs_file_operations_dotl = {
	.llseek = generic_file_llseek,
	.read_iter = v9fs_file_read_iter,
	.write_iter = v9fs_file_write_iter,
	.open = v9fs_file_open,
	.release = v9fs_dir_release,
	.lock = v9fs_file_lock_dotl,
	.flock = v9fs_file_flock_dotl,
	.mmap_prepare = v9fs_file_mmap_prepare,
	.splice_read = v9fs_file_splice_read,
	.splice_write = iter_file_splice_write,
	.fsync = v9fs_file_fsync_dotl,
};

Annotation

• Immediate include surface: `linux/module.h`, `linux/errno.h`, `linux/fs.h`, `linux/filelock.h`, `linux/sched.h`, `linux/file.h`, `linux/stat.h`, `linux/string.h`.
• Detected declarations: `function v9fs_file_open`, `function v9fs_file_lock`, `function v9fs_file_do_lock`, `function v9fs_file_getlock`, `function v9fs_file_lock_dotl`, `function v9fs_file_flock_dotl`, `function v9fs_file_read_iter`, `function v9fs_file_splice_read`, `function v9fs_file_write_iter`, `function v9fs_file_fsync`.
• 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.