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| author | Paul Menage <menage@google.com> | 2008-04-29 00:59:58 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-04-29 08:06:08 -0700 |
| commit | 2c7eabf37647dd459d555e76954b4de87be2321f (patch) | |
| tree | 553a080db29ad1d9724e6c7da30f64f5fe7cc12a | |
| parent | f4c753b7eacc277e506066abdda351cbc1cf8e6a (diff) | |
| download | linux-2c7eabf37647dd459d555e76954b4de87be2321f.tar.bz2 | |
CGroup API files: add res_counter_read_u64()
Adds a function for returning the value of a resource counter member, in a
form suitable for use in a cgroup read_u64 control file method.
Signed-off-by: Paul Menage <menage@google.com>
Cc: "Li Zefan" <lizf@cn.fujitsu.com>
Cc: Balbir Singh <balbir@in.ibm.com>
Cc: Paul Jackson <pj@sgi.com>
Cc: Pavel Emelyanov <xemul@openvz.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: "YAMAMOTO Takashi" <yamamoto@valinux.co.jp>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | include/linux/res_counter.h | 5 | ||||
| -rw-r--r-- | kernel/res_counter.c | 5 |
2 files changed, 9 insertions, 1 deletions
diff --git a/include/linux/res_counter.h b/include/linux/res_counter.h index 61363ce896d5..8cb1ecd420a9 100644 --- a/include/linux/res_counter.h +++ b/include/linux/res_counter.h @@ -39,8 +39,9 @@ struct res_counter { spinlock_t lock; }; -/* +/** * 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 * @@ -51,6 +52,8 @@ struct res_counter { * @pos: and the offset. */ +u64 res_counter_read_u64(struct res_counter *counter, int member); + ssize_t res_counter_read(struct res_counter *counter, int member, const char __user *buf, size_t nbytes, loff_t *pos, int (*read_strategy)(unsigned long long val, char *s)); diff --git a/kernel/res_counter.c b/kernel/res_counter.c index a508c2769463..70587657dda3 100644 --- a/kernel/res_counter.c +++ b/kernel/res_counter.c @@ -93,6 +93,11 @@ ssize_t res_counter_read(struct res_counter *counter, int member, pos, buf, s - buf); } +u64 res_counter_read_u64(struct res_counter *counter, int member) +{ + return *res_counter_member(counter, member); +} + 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)) |