kernel/power/user.c

File Facts

System

Linux kernel

Corpus path

kernel/power/user.c

Extension

.c

Size

10286 bytes

Lines

482

Domain

Core OS

Bucket

Scheduler, Processes, Timers, Sync, And Syscalls

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.
• Touches user memory; correctness depends on fault-safe copying and privilege boundary handling.
• Defines or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.

Dependency Surface

• linux/suspend.h
• linux/reboot.h
• linux/string.h
• linux/device.h
• linux/miscdevice.h
• linux/mm.h
• linux/swap.h
• linux/swapops.h
• linux/pm.h
• linux/fs.h
• linux/compat.h
• linux/console.h
• linux/cpu.h
• linux/freezer.h
• linux/uaccess.h
• power.h

Detected Declarations

• struct compat_resume_swap_area
• function is_hibernate_resume_dev
• function snapshot_open
• function snapshot_release
• function snapshot_read
• function snapshot_write
• function snapshot_set_swap_area
• function snapshot_ioctl
• function snapshot_compat_ioctl
• function snapshot_device_init
• module init snapshot_device_init

Annotated Snippet

static const struct file_operations snapshot_fops = {
	.open = snapshot_open,
	.release = snapshot_release,
	.read = snapshot_read,
	.write = snapshot_write,
	.unlocked_ioctl = snapshot_ioctl,
#ifdef CONFIG_COMPAT
	.compat_ioctl = snapshot_compat_ioctl,
#endif
};

static struct miscdevice snapshot_device = {
	.minor = SNAPSHOT_MINOR,
	.name = "snapshot",
	.fops = &snapshot_fops,
};

static int __init snapshot_device_init(void)
{
	return misc_register(&snapshot_device);
};

device_initcall(snapshot_device_init);

Annotation

• Immediate include surface: `linux/suspend.h`, `linux/reboot.h`, `linux/string.h`, `linux/device.h`, `linux/miscdevice.h`, `linux/mm.h`, `linux/swap.h`, `linux/swapops.h`.
• Detected declarations: `struct compat_resume_swap_area`, `function is_hibernate_resume_dev`, `function snapshot_open`, `function snapshot_release`, `function snapshot_read`, `function snapshot_write`, `function snapshot_set_swap_area`, `function snapshot_ioctl`, `function snapshot_compat_ioctl`, `function snapshot_device_init`.
• Atlas domain: Core OS / Scheduler, Processes, Timers, Sync, And Syscalls.
• Implementation status: pattern implementation candidate.
• This snippet crosses the user/kernel memory boundary; validate fault handling and access checks before translating the pattern.

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.