fs/zonefs/file.c

File Facts

System

Linux kernel

Corpus path

fs/zonefs/file.c

Extension

.c

Size

23129 bytes

Lines

874

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/module.h
• linux/pagemap.h
• linux/iomap.h
• linux/init.h
• linux/slab.h
• linux/blkdev.h
• linux/statfs.h
• linux/writeback.h
• linux/quotaops.h
• linux/seq_file.h
• linux/parser.h
• linux/uio.h
• linux/mman.h
• linux/sched/mm.h
• linux/task_io_accounting_ops.h
• zonefs.h
• trace.h

Detected Declarations

• function Copyright
• function zonefs_write_iomap_begin
• function zonefs_read_folio
• function zonefs_readahead
• function zonefs_writeback_range
• function zonefs_writepages
• function zonefs_swap_activate
• function zonefs_file_truncate
• function zonefs_file_fsync
• function zonefs_filemap_page_mkwrite
• function zonefs_file_mmap_prepare
• function zonefs_file_llseek
• function zonefs_file_write_dio_end_io
• function zonefs_write_check_limits
• function zonefs_write_checks
• function used
• function again
• function zonefs_file_buffered_write
• function zonefs_file_write_iter
• function zonefs_file_read_dio_end_io
• function zonefs_file_read_iter
• function zonefs_file_splice_read
• function zonefs_seq_file_need_wro
• function zonefs_seq_file_write_open
• function zonefs_file_open
• function zonefs_seq_file_write_close
• function anymore
• function written
• function zonefs_file_release

Annotated Snippet

const struct file_operations zonefs_file_operations = {
	.open		= zonefs_file_open,
	.release	= zonefs_file_release,
	.fsync		= zonefs_file_fsync,
	.mmap_prepare	= zonefs_file_mmap_prepare,
	.llseek		= zonefs_file_llseek,
	.read_iter	= zonefs_file_read_iter,
	.write_iter	= zonefs_file_write_iter,
	.splice_read	= zonefs_file_splice_read,
	.splice_write	= iter_file_splice_write,
	.iopoll		= iocb_bio_iopoll,
};

Annotation

• Immediate include surface: `linux/module.h`, `linux/pagemap.h`, `linux/iomap.h`, `linux/init.h`, `linux/slab.h`, `linux/blkdev.h`, `linux/statfs.h`, `linux/writeback.h`.
• Detected declarations: `function Copyright`, `function zonefs_write_iomap_begin`, `function zonefs_read_folio`, `function zonefs_readahead`, `function zonefs_writeback_range`, `function zonefs_writepages`, `function zonefs_swap_activate`, `function zonefs_file_truncate`, `function zonefs_file_fsync`, `function zonefs_filemap_page_mkwrite`.
• 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.