kernel/fail_function.c

File Facts

System

Linux kernel

Corpus path

kernel/fail_function.c

Extension

.c

Size

6948 bytes

Lines

335

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.
• 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/error-injection.h
• linux/debugfs.h
• linux/fault-inject.h
• linux/kallsyms.h
• linux/kprobes.h
• linux/module.h
• linux/mutex.h
• linux/slab.h
• linux/uaccess.h

Detected Declarations

• struct fei_attr
• function fei_post_handler
• function adjust_error_retval
• function fei_attr_free
• function list_for_each_entry
• function fei_attr_is_valid
• function list_for_each_entry
• function fei_retval_set
• function fei_retval_get
• function fei_debugfs_add_attr
• function fei_debugfs_remove_attr
• function fei_kprobe_handler
• function fei_seq_stop
• function fei_seq_show
• function fei_open
• function fei_attr_remove
• function fei_attr_remove_all
• function list_for_each_entry_safe
• function fei_write
• function fei_debugfs_init

Annotated Snippet

static const struct file_operations fei_ops = {
	.open =		fei_open,
	.read =		seq_read,
	.write =	fei_write,
	.llseek =	seq_lseek,
	.release =	seq_release,
};

static int __init fei_debugfs_init(void)
{
	struct dentry *dir;

	dir = fault_create_debugfs_attr("fail_function", NULL,
					&fei_fault_attr);
	if (IS_ERR(dir))
		return PTR_ERR(dir);

	/* injectable attribute is just a symlink of error_inject/list */
	debugfs_create_symlink("injectable", dir, "../error_injection/list");

	debugfs_create_file("inject", 0600, dir, NULL, &fei_ops);

	fei_debugfs_dir = dir;

	return 0;
}

late_initcall(fei_debugfs_init);

Annotation

• Immediate include surface: `linux/error-injection.h`, `linux/debugfs.h`, `linux/fault-inject.h`, `linux/kallsyms.h`, `linux/kprobes.h`, `linux/module.h`, `linux/mutex.h`, `linux/slab.h`.
• Detected declarations: `struct fei_attr`, `function fei_post_handler`, `function adjust_error_retval`, `function fei_attr_free`, `function list_for_each_entry`, `function fei_attr_is_valid`, `function list_for_each_entry`, `function fei_retval_set`, `function fei_retval_get`, `function fei_debugfs_add_attr`.
• Atlas domain: Core OS / Scheduler, Processes, Timers, Sync, And Syscalls.
• 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.