include/linux/task_io_accounting_ops.h
Source file repositories/reference/linux-study-clean/include/linux/task_io_accounting_ops.h
File Facts
- System
- Linux kernel
- Corpus path
include/linux/task_io_accounting_ops.h- Extension
.h- Size
- 2610 bytes
- Lines
- 115
- Domain
- Core OS
- Bucket
- Core Kernel Interface
- Inferred role
- Core OS: implementation source
- Status
- source 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 or uses C structs; map object ownership, embedded links, reference counts, and lock ownership.
Dependency Surface
linux/sched.h
Detected Declarations
function task_io_account_readfunction task_io_get_inblockfunction task_io_account_writefunction task_io_get_oublockfunction task_io_account_cancelled_writefunction task_io_accounting_initfunction task_blk_io_accounting_addfunction task_io_account_readfunction task_io_account_writefunction task_io_account_cancelled_writefunction task_chr_io_accounting_add
Annotated Snippet
#ifndef __TASK_IO_ACCOUNTING_OPS_INCLUDED
#define __TASK_IO_ACCOUNTING_OPS_INCLUDED
#include <linux/sched.h>
#ifdef CONFIG_TASK_IO_ACCOUNTING
static inline void task_io_account_read(size_t bytes)
{
current->ioac.read_bytes += bytes;
}
/*
* We approximate number of blocks, because we account bytes only.
* A 'block' is 512 bytes
*/
static inline unsigned long task_io_get_inblock(const struct task_struct *p)
{
return p->ioac.read_bytes >> 9;
}
static inline void task_io_account_write(size_t bytes)
{
current->ioac.write_bytes += bytes;
}
/*
* We approximate number of blocks, because we account bytes only.
* A 'block' is 512 bytes
*/
static inline unsigned long task_io_get_oublock(const struct task_struct *p)
{
return p->ioac.write_bytes >> 9;
}
static inline void task_io_account_cancelled_write(size_t bytes)
{
current->ioac.cancelled_write_bytes += bytes;
}
static inline void task_io_accounting_init(struct task_io_accounting *ioac)
{
memset(ioac, 0, sizeof(*ioac));
}
static inline void task_blk_io_accounting_add(struct task_io_accounting *dst,
struct task_io_accounting *src)
{
dst->read_bytes += src->read_bytes;
dst->write_bytes += src->write_bytes;
dst->cancelled_write_bytes += src->cancelled_write_bytes;
}
#else
static inline void task_io_account_read(size_t bytes)
{
}
static inline unsigned long task_io_get_inblock(const struct task_struct *p)
{
return 0;
}
static inline void task_io_account_write(size_t bytes)
{
}
static inline unsigned long task_io_get_oublock(const struct task_struct *p)
{
return 0;
}
static inline void task_io_account_cancelled_write(size_t bytes)
{
}
static inline void task_io_accounting_init(struct task_io_accounting *ioac)
{
}
static inline void task_blk_io_accounting_add(struct task_io_accounting *dst,
struct task_io_accounting *src)
{
}
#endif /* CONFIG_TASK_IO_ACCOUNTING */
#ifdef CONFIG_TASK_XACCT
static inline void task_chr_io_accounting_add(struct task_io_accounting *dst,
struct task_io_accounting *src)
Annotation
- Immediate include surface: `linux/sched.h`.
- Detected declarations: `function task_io_account_read`, `function task_io_get_inblock`, `function task_io_account_write`, `function task_io_get_oublock`, `function task_io_account_cancelled_write`, `function task_io_accounting_init`, `function task_blk_io_accounting_add`, `function task_io_account_read`, `function task_io_account_write`, `function task_io_account_cancelled_write`.
- Atlas domain: Core OS / Core Kernel Interface.
- Implementation status: source 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.