[PATCH 09/10] Add generic '->checkpoint()' f_op to simple char devices

[ntl@pobox.com]

From: Oren Laadan <orenl@cs.columbia.edu>

* /dev/null
* /dev/zero
* /dev/random
* /dev/urandom

Signed-off-by: Oren Laadan <orenl@cs.columbia.edu>
Signed-off-by: Nathan Lynch <ntl@pobox.com>
---
 drivers/char/mem.c    |    6 ++++++
 drivers/char/random.c |    6 ++++++
 2 files changed, 12 insertions(+), 0 deletions(-)

diff --git a/drivers/char/mem.c b/drivers/char/mem.c
index 1256454..3452d1f 100644
--- a/drivers/char/mem.c
+++ b/drivers/char/mem.c
@@ -767,6 +767,9 @@ static const struct file_operations null_fops = {
 	.read		= read_null,
 	.write		= write_null,
 	.splice_write	= splice_write_null,
+#ifdef CONFIG_CHECKPOINT
+	.checkpoint	= generic_file_checkpoint,
+#endif
 };
 
 #ifdef CONFIG_DEVPORT
@@ -783,6 +786,9 @@ static const struct file_operations zero_fops = {
 	.read		= read_zero,
 	.write		= write_zero,
 	.mmap		= mmap_zero,
+#ifdef CONFIG_CHECKPOINT
+	.checkpoint	= generic_file_checkpoint,
+#endif
 };
 
 /*
diff --git a/drivers/char/random.c b/drivers/char/random.c
index 5a1aa64..67d00b8 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -1166,6 +1166,9 @@ const struct file_operations random_fops = {
 	.unlocked_ioctl = random_ioctl,
 	.fasync = random_fasync,
 	.llseek = noop_llseek,
+#ifdef CONFIG_CHECKPOINT
+	.checkpoint = generic_file_checkpoint,
+#endif
 };
 
 const struct file_operations urandom_fops = {
@@ -1174,6 +1177,9 @@ const struct file_operations urandom_fops = {
 	.unlocked_ioctl = random_ioctl,
 	.fasync = random_fasync,
 	.llseek = noop_llseek,
+#ifdef CONFIG_CHECKPOINT
+	.checkpoint = generic_file_checkpoint,
+#endif
 };
 
 /***************************************************************
-- 
1.7.4