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authorTejun Heo <tj@kernel.org>2014-05-13 12:16:21 -0400
committerTejun Heo <tj@kernel.org>2014-05-13 12:16:21 -0400
commit451af504df0c62f695a69b83c250486e77c66378 (patch)
treef89879cf3f88e9da346d8bd3fa1ae192a280d772 /kernel/cgroup_freezer.c
parentb41686401e501430ffe93b575ef7959d2ecc6f2e (diff)
cgroup: replace cftype->write_string() with cftype->write()
Convert all cftype->write_string() users to the new cftype->write() which maps directly to kernfs write operation and has full access to kernfs and cgroup contexts. The conversions are mostly mechanical. * @css and @cft are accessed using of_css() and of_cft() accessors respectively instead of being specified as arguments. * Should return @nbytes on success instead of 0. * @buf is not trimmed automatically. Trim if necessary. Note that blkcg and netprio don't need this as the parsers already handle whitespaces. cftype->write_string() has no user left after the conversions and removed. While at it, remove unnecessary local variable @p in cgroup_subtree_control_write() and stale comment about CGROUP_LOCAL_BUFFER_SIZE in cgroup_freezer.c. This patch doesn't introduce any visible behavior changes. v2: netprio was missing from conversion. Converted. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Aristeu Rozanski <arozansk@redhat.com> Acked-by: Vivek Goyal <vgoyal@redhat.com> Acked-by: Li Zefan <lizefan@huawei.com> Cc: Jens Axboe <axboe@kernel.dk> Cc: Johannes Weiner <hannes@cmpxchg.org> Cc: Michal Hocko <mhocko@suse.cz> Cc: Neil Horman <nhorman@tuxdriver.com> Cc: "David S. Miller" <davem@davemloft.net>
Diffstat (limited to 'kernel/cgroup_freezer.c')
-rw-r--r--kernel/cgroup_freezer.c20
1 files changed, 9 insertions, 11 deletions
diff --git a/kernel/cgroup_freezer.c b/kernel/cgroup_freezer.c
index 0398f7e9ac8..6b4e60e33a9 100644
--- a/kernel/cgroup_freezer.c
+++ b/kernel/cgroup_freezer.c
@@ -73,10 +73,6 @@ bool cgroup_freezing(struct task_struct *task)
return ret;
}
-/*
- * cgroups_write_string() limits the size of freezer state strings to
- * CGROUP_LOCAL_BUFFER_SIZE
- */
static const char *freezer_state_strs(unsigned int state)
{
if (state & CGROUP_FROZEN)
@@ -423,20 +419,22 @@ static void freezer_change_state(struct freezer *freezer, bool freeze)
mutex_unlock(&freezer_mutex);
}
-static int freezer_write(struct cgroup_subsys_state *css, struct cftype *cft,
- char *buffer)
+static ssize_t freezer_write(struct kernfs_open_file *of,
+ char *buf, size_t nbytes, loff_t off)
{
bool freeze;
- if (strcmp(buffer, freezer_state_strs(0)) == 0)
+ buf = strstrip(buf);
+
+ if (strcmp(buf, freezer_state_strs(0)) == 0)
freeze = false;
- else if (strcmp(buffer, freezer_state_strs(CGROUP_FROZEN)) == 0)
+ else if (strcmp(buf, freezer_state_strs(CGROUP_FROZEN)) == 0)
freeze = true;
else
return -EINVAL;
- freezer_change_state(css_freezer(css), freeze);
- return 0;
+ freezer_change_state(css_freezer(of_css(of)), freeze);
+ return nbytes;
}
static u64 freezer_self_freezing_read(struct cgroup_subsys_state *css,
@@ -460,7 +458,7 @@ static struct cftype files[] = {
.name = "state",
.flags = CFTYPE_NOT_ON_ROOT,
.seq_show = freezer_read,
- .write_string = freezer_write,
+ .write = freezer_write,
},
{
.name = "self_freezing",