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cgroup: replace cftype->trigger() with cftype->write()

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cftype->trigger() is pointless.  It's trivial to ignore the input
buffer from a regular ->write() operation.  Convert all ->trigger()
users to ->write() and remove ->trigger().

This patch doesn't introduce any visible behavior changes.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@suse.cz>
This commit is contained in:
Tejun Heo
2014-05-13 12:16:21 -04:00
rodzic 451af504df
commit 6770c64e5c
5 zmienionych plików z 35 dodań i 43 usunięć
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34
mm/memcontrol.c
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@@ -4887,14 +4887,15 @@ static int mem_cgroup_force_empty(struct mem_cgroup *memcg)
return 0;
}
static int mem_cgroup_force_empty_write(struct cgroup_subsys_state *css,
unsigned int event)
static ssize_t mem_cgroup_force_empty_write(struct kernfs_open_file *of,
char *buf, size_t nbytes,
loff_t off)
{
struct mem_cgroup *memcg = mem_cgroup_from_css(css);
struct mem_cgroup *memcg = mem_cgroup_from_css(of_css(of));
if (mem_cgroup_is_root(memcg))
return -EINVAL;
return mem_cgroup_force_empty(memcg);
return mem_cgroup_force_empty(memcg) ?: nbytes;
}
static u64 mem_cgroup_hierarchy_read(struct cgroup_subsys_state *css,
@@ -5220,14 +5221,15 @@ out:
*memsw_limit = min_memsw_limit;
}
static int mem_cgroup_reset(struct cgroup_subsys_state *css, unsigned int event)
static ssize_t mem_cgroup_reset(struct kernfs_open_file *of, char *buf,
size_t nbytes, loff_t off)
{
struct mem_cgroup *memcg = mem_cgroup_from_css(css);
struct mem_cgroup *memcg = mem_cgroup_from_css(of_css(of));
int name;
enum res_type type;
type = MEMFILE_TYPE(event);
name = MEMFILE_ATTR(event);
type = MEMFILE_TYPE(of_cft(of)->private);
name = MEMFILE_ATTR(of_cft(of)->private);
switch (name) {
case RES_MAX_USAGE:
@@ -5252,7 +5254,7 @@ static int mem_cgroup_reset(struct cgroup_subsys_state *css, unsigned int event)
break;
}
return 0;
return nbytes;
}
static u64 mem_cgroup_move_charge_read(struct cgroup_subsys_state *css,
@@ -6105,7 +6107,7 @@ static struct cftype mem_cgroup_files[] = {
{
.name = "max_usage_in_bytes",
.private = MEMFILE_PRIVATE(_MEM, RES_MAX_USAGE),
.trigger = mem_cgroup_reset,
.write = mem_cgroup_reset,
.read_u64 = mem_cgroup_read_u64,
},
{
@@ -6123,7 +6125,7 @@ static struct cftype mem_cgroup_files[] = {
{
.name = "failcnt",
.private = MEMFILE_PRIVATE(_MEM, RES_FAILCNT),
.trigger = mem_cgroup_reset,
.write = mem_cgroup_reset,
.read_u64 = mem_cgroup_read_u64,
},
{
@@ -6132,7 +6134,7 @@ static struct cftype mem_cgroup_files[] = {
},
{
.name = "force_empty",
.trigger = mem_cgroup_force_empty_write,
.write = mem_cgroup_force_empty_write,
},
{
.name = "use_hierarchy",
@@ -6186,13 +6188,13 @@ static struct cftype mem_cgroup_files[] = {
{
.name = "kmem.failcnt",
.private = MEMFILE_PRIVATE(_KMEM, RES_FAILCNT),
.trigger = mem_cgroup_reset,
.write = mem_cgroup_reset,
.read_u64 = mem_cgroup_read_u64,
},
{
.name = "kmem.max_usage_in_bytes",
.private = MEMFILE_PRIVATE(_KMEM, RES_MAX_USAGE),
.trigger = mem_cgroup_reset,
.write = mem_cgroup_reset,
.read_u64 = mem_cgroup_read_u64,
},
#ifdef CONFIG_SLABINFO
@@ -6215,7 +6217,7 @@ static struct cftype memsw_cgroup_files[] = {
{
.name = "memsw.max_usage_in_bytes",
.private = MEMFILE_PRIVATE(_MEMSWAP, RES_MAX_USAGE),
.trigger = mem_cgroup_reset,
.write = mem_cgroup_reset,
.read_u64 = mem_cgroup_read_u64,
},
{
@@ -6227,7 +6229,7 @@ static struct cftype memsw_cgroup_files[] = {
{
.name = "memsw.failcnt",
.private = MEMFILE_PRIVATE(_MEMSWAP, RES_FAILCNT),
.trigger = mem_cgroup_reset,
.write = mem_cgroup_reset,
.read_u64 = mem_cgroup_read_u64,
},
{ }, /* terminate */