From a4f5f251e951d2e6f454f82c58e7044f7de87a0d Mon Sep 17 00:00:00 2001
From: Jin Qian <jinqian@google.com>
Date: Thu, 2 Mar 2017 13:32:59 -0800
Subject: [PATCH] ANDROID: sched: add a counter to track fsync

Change-Id: I6c138de5b2332eea70f57e098134d1d141247b3f
Signed-off-by: Jin Qian <jinqian@google.com>
---
 fs/sync.c                              | 1 +
 include/linux/sched.h                  | 8 ++++++++
 include/linux/task_io_accounting.h     | 2 ++
 include/linux/task_io_accounting_ops.h | 1 +
 4 files changed, 12 insertions(+)

diff --git a/fs/sync.c b/fs/sync.c
index dd5d1711c7ac..452179e31c39 100644
--- a/fs/sync.c
+++ b/fs/sync.c
@@ -218,6 +218,7 @@ static int do_fsync(unsigned int fd, int datasync)
 	if (f.file) {
 		ret = vfs_fsync(f.file, datasync);
 		fdput(f);
+		inc_syscfs(current);
 	}
 	return ret;
 }
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 8be9f0dbdd0c..5b250c9f7718 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -3227,6 +3227,11 @@ static inline void inc_syscw(struct task_struct *tsk)
 {
 	tsk->ioac.syscw++;
 }
+
+static inline void inc_syscfs(struct task_struct *tsk)
+{
+	tsk->ioac.syscfs++;
+}
 #else
 static inline void add_rchar(struct task_struct *tsk, ssize_t amt)
 {
@@ -3243,6 +3248,9 @@ static inline void inc_syscr(struct task_struct *tsk)
 static inline void inc_syscw(struct task_struct *tsk)
 {
 }
+static inline void inc_syscfs(struct task_struct *tsk)
+{
+}
 #endif
 
 #ifndef TASK_SIZE_OF
diff --git a/include/linux/task_io_accounting.h b/include/linux/task_io_accounting.h
index bdf855c2856f..2dd338fdf881 100644
--- a/include/linux/task_io_accounting.h
+++ b/include/linux/task_io_accounting.h
@@ -18,6 +18,8 @@ struct task_io_accounting {
 	u64 syscr;
 	/* # of write syscalls */
 	u64 syscw;
+	/* # of fsync syscalls */
+	u64 syscfs;
 #endif /* CONFIG_TASK_XACCT */
 
 #ifdef CONFIG_TASK_IO_ACCOUNTING
diff --git a/include/linux/task_io_accounting_ops.h b/include/linux/task_io_accounting_ops.h
index 4d090f9ee608..1b505c804af3 100644
--- a/include/linux/task_io_accounting_ops.h
+++ b/include/linux/task_io_accounting_ops.h
@@ -96,6 +96,7 @@ static inline void task_chr_io_accounting_add(struct task_io_accounting *dst,
 	dst->wchar += src->wchar;
 	dst->syscr += src->syscr;
 	dst->syscw += src->syscw;
+	dst->syscfs += src->syscfs;
 }
 #else
 static inline void task_chr_io_accounting_add(struct task_io_accounting *dst,