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authorPaul Menage <menage@google.com>2008-07-25 01:47:04 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2008-07-25 10:53:36 -0700
commit856c13aa1ff6136c1968414fdea5938ea9d5ebf2 (patch)
treedeee908f253c77cbcb868a915e45bfb2ed99383c /mm
parentf92523e3a7861f5dbd76021e0719a35fe8771f2d (diff)
downloadlinux-2.6.34-ux500-856c13aa1ff6136c1968414fdea5938ea9d5ebf2.tar.gz
cgroup files: convert res_counter_write() to be a cgroups write_string() handler
Currently res_counter_write() is a raw file handler even though it's ultimately taking a number, since in some cases it wants to pre-process the string when converting it to a number. This patch converts res_counter_write() from a raw file handler to a write_string() handler; this allows some of the boilerplate copying/locking/checking to be removed, and simplies the cleanup path, since these functions are now performed by the cgroups framework. [lizf@cn.fujitsu.com: build fix] Signed-off-by: Paul Menage <menage@google.com> Cc: Paul Jackson <pj@sgi.com> Cc: Pavel Emelyanov <xemul@openvz.org> Cc: Balbir Singh <balbir@in.ibm.com> Cc: Serge Hallyn <serue@us.ibm.com> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Signed-off-by: Li Zefan <lizf@cn.fujitsu.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/memcontrol.c24
1 files changed, 5 insertions, 19 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c
index e46451e1d9b..7385d58fb06 100644
--- a/mm/memcontrol.c
+++ b/mm/memcontrol.c
@@ -838,32 +838,18 @@ out:
return ret;
}
-static int mem_cgroup_write_strategy(char *buf, unsigned long long *tmp)
-{
- *tmp = memparse(buf, &buf);
- if (*buf != '\0')
- return -EINVAL;
-
- /*
- * Round up the value to the closest page size
- */
- *tmp = ((*tmp + PAGE_SIZE - 1) >> PAGE_SHIFT) << PAGE_SHIFT;
- return 0;
-}
-
static u64 mem_cgroup_read(struct cgroup *cont, struct cftype *cft)
{
return res_counter_read_u64(&mem_cgroup_from_cont(cont)->res,
cft->private);
}
-static ssize_t mem_cgroup_write(struct cgroup *cont, struct cftype *cft,
- struct file *file, const char __user *userbuf,
- size_t nbytes, loff_t *ppos)
+static int mem_cgroup_write(struct cgroup *cont, struct cftype *cft,
+ const char *buffer)
{
return res_counter_write(&mem_cgroup_from_cont(cont)->res,
- cft->private, userbuf, nbytes, ppos,
- mem_cgroup_write_strategy);
+ cft->private, buffer,
+ res_counter_memparse_write_strategy);
}
static int mem_cgroup_reset(struct cgroup *cont, unsigned int event)
@@ -940,7 +926,7 @@ static struct cftype mem_cgroup_files[] = {
{
.name = "limit_in_bytes",
.private = RES_LIMIT,
- .write = mem_cgroup_write,
+ .write_string = mem_cgroup_write,
.read_u64 = mem_cgroup_read,
},
{