fs/direct-io.c
Source file repositories/reference/linux-study-clean/fs/direct-io.c
File Facts
- System
- Linux kernel
- Corpus path
fs/direct-io.c- Extension
.c- Size
- 39024 bytes
- Lines
- 1317
- Domain
- Core OS
- Bucket
- VFS And Filesystem Core
- Inferred role
- Core OS: exported/initcall integration point
- Status
- integration 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.
- Exports symbols or registers init work; inspect boot/module ordering and who consumes the exported contract.
- Touches user memory; correctness depends on fault-safe copying and privilege boundary handling.
- Uses kernel synchronization; read lock ordering, sleepability, and interrupt context assumptions before translating.
- 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/kernel.hlinux/module.hlinux/types.hlinux/fs.hlinux/mm.hlinux/slab.hlinux/highmem.hlinux/pagemap.hlinux/task_io_accounting_ops.hlinux/bio.hlinux/wait.hlinux/err.hlinux/blkdev.hlinux/buffer_head.hlinux/rwsem.hlinux/uio.hlinux/atomic.hinternal.h
Detected Declarations
struct dio_submitstruct diofunction dio_pages_presentfunction dio_refill_pagesfunction iov_iter_extract_pagesfunction dio_pin_pagefunction dio_unpin_pagefunction dio_completefunction dio_aio_complete_workfunction dio_bio_end_aiofunction dio_bio_end_iofunction dio_bio_allocfunction bio_check_pages_dirtyfunction dio_cleanupfunction dio_bio_completefunction dio_completefunction dio_bio_reapfunction dio_set_defer_completionfunction get_blockfunction dio_new_biofunction dio_bio_add_pagefunction herefunction submit_page_sectionfunction get_blockfunction offunction drop_refcountfunction __blockdev_direct_IOfunction O_function dio_initmodule init dio_initexport __blockdev_direct_IO
Annotated Snippet
module_init(dio_init)Annotation
- Immediate include surface: `linux/kernel.h`, `linux/module.h`, `linux/types.h`, `linux/fs.h`, `linux/mm.h`, `linux/slab.h`, `linux/highmem.h`, `linux/pagemap.h`.
- Detected declarations: `struct dio_submit`, `struct dio`, `function dio_pages_present`, `function dio_refill_pages`, `function iov_iter_extract_pages`, `function dio_pin_page`, `function dio_unpin_page`, `function dio_complete`, `function dio_aio_complete_work`, `function dio_bio_end_aio`.
- Atlas domain: Core OS / VFS And Filesystem Core.
- Implementation status: integration implementation candidate.
- This snippet crosses the user/kernel memory boundary; validate fault handling and access checks before translating the pattern.
- 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.