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From: Oren Laadan on 1 May 2010 10:40
* /dev/null
* /dev/zero
* /dev/random
* /dev/urandom

Changelog [v21]:
- Put file_ops->checkpoint under CONFIG_CHECKPOINT

Cc: linux-fsdevel(a)vger.kernel.org
Signed-off-by: Oren Laadan <orenl(a)cs.columbia.edu>
Acked-by: Serge E. Hallyn <serue(a)us.ibm.com>
Tested-by: Serge E. Hallyn <serue(a)us.ibm.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 f54dab8..4e48384 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 2fd3d39..47a224c 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -1169,6 +1169,9 @@ const struct file_operations random_fops = {
.poll = random_poll,
.unlocked_ioctl = random_ioctl,
.fasync = random_fasync,
+#ifdef CONFIG_CHECKPOINT
+ .checkpoint = generic_file_checkpoint,
+#endif
};

const struct file_operations urandom_fops = {
@@ -1176,6 +1179,9 @@ const struct file_operations urandom_fops = {
.write = random_write,
.unlocked_ioctl = random_ioctl,
.fasync = random_fasync,
+#ifdef CONFIG_CHECKPOINT
+ .checkpoint = generic_file_checkpoint,
+#endif
};

/***************************************************************
--
1.6.3.3

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Prev: [PATCH v21 039/100] c/r: introduce method '->checkpoint()' in struct vm_operations_struct
Next: [PATCH v21 017/100] cgroup freezer: interface to freeze a cgroup from within the kernel