1 files changed, 113 insertions, 0 deletions
diff --git a/include/linux/task_io_accounting_ops.h b/include/linux/task_io_accounting_ops.h
new file mode 100644
index 000000000..4d090f9ee
--- /dev/null
+++ b/include/linux/task_io_accounting_ops.h
@@ -0,0 +1,113 @@
+/*
+ * Task I/O accounting operations
+ */
+#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)
+{
+	dst->rchar += src->rchar;
+	dst->wchar += src->wchar;
+	dst->syscr += src->syscr;
+	dst->syscw += src->syscw;
+}
+#else
+static inline void task_chr_io_accounting_add(struct task_io_accounting *dst,
+						struct task_io_accounting *src)
+{
+}
+#endif /* CONFIG_TASK_XACCT */
+
+static inline void task_io_accounting_add(struct task_io_accounting *dst,
+						struct task_io_accounting *src)
+{
+	task_chr_io_accounting_add(dst, src);
+	task_blk_io_accounting_add(dst, src);
+}
+#endif /* __TASK_IO_ACCOUNTING_OPS_INCLUDED */