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Commit 2c7eabf3 authored by Paul Menage's avatar Paul Menage Committed by Linus Torvalds
Browse files

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: default avatarPaul 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: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent f4c753b7

include/linux/res_counter.h

+4 −1
Original line number Diff line number Diff line
@@ -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));

kernel/res_counter.c

+5 −0
Original line number Diff line number Diff line
@@ -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))