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Subject[PATCH 1/3] res_counter: introduce res_counter_write_u64()
This function can be used to assign the value of a resource counter member.

Signed-off-by: Li Zefan <lizf@cn.fujitsu.com>
---
include/linux/res_counter.h | 9 ++++++---
kernel/res_counter.c | 9 +++++++++
2 files changed, 15 insertions(+), 3 deletions(-)

diff --git a/include/linux/res_counter.h b/include/linux/res_counter.h
index 8cb1ecd..8c23f7f 100644
--- a/include/linux/res_counter.h
+++ b/include/linux/res_counter.h
@@ -41,9 +41,10 @@ struct res_counter {

/**
* Helpers to interact with userspace
- * res_counter_read_u64() - returns the value of the specified member.
- * res_counter_read/_write - put/get the specified fields from the
- * res_counter struct to/from the user
+ * res_counter_read_64/_write_u64 - returns/assigns the value of the
+ * specified member
+ * res_counter_read/_write - puts/gets the specified fields from the
+ * res_counter struct to/from the user
*
* @counter: the counter in question
* @member: the field to work with (see RES_xxx below)
@@ -53,6 +54,8 @@ struct res_counter {
*/

u64 res_counter_read_u64(struct res_counter *counter, int member);
+void res_counter_write_u64(struct res_counter *counter, int member,
+ unsigned long long val);

ssize_t res_counter_read(struct res_counter *counter, int member,
const char __user *buf, size_t nbytes, loff_t *pos,
diff --git a/kernel/res_counter.c b/kernel/res_counter.c
index 791ff2b..a16b727 100644
--- a/kernel/res_counter.c
+++ b/kernel/res_counter.c
@@ -97,6 +97,15 @@ u64 res_counter_read_u64(struct res_counter *counter, int member)
return *res_counter_member(counter, member);
}

+void res_counter_write_u64(struct res_counter *counter, int member,
+ unsigned long long val)
+{
+ unsigned long long *tmp;
+
+ tmp = res_counter_member(counter, member);
+ *tmp = val;
+}
+
ssize_t res_counter_write(struct res_counter *counter, int member,
const char __user *userbuf, size_t nbytes, loff_t *pos,
int (*write_strategy)(char *st_buf, unsigned long long *val))
--
1.5.4.rc3


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