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Subject[PATCH 05/10] cgroup: convert all non-memcg controllers to the new cftype interface
Date
Convert debug, freezer, cpuset, cpu_cgroup, cpuacct, net_prio, blkio,
net_cls and device controllers to use the new cftype based interface.
Termination entry is added to cftype arrays and populate callbacks are
replaced with CGROUP_SUBSYS_CFTYPES() macro invocations.

This is functionally identical transformation. There shouldn't be any
visible behavior change.

memcg is rather special and will be converted separately.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Paul Menage <paul@paulmenage.org>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Vivek Goyal <vgoyal@redhat.com>
Cc: Li Zefan <lizf@cn.fujitsu.com>
---
block/blk-cgroup.c | 10 ++--------
kernel/cgroup.c | 10 +++-------
kernel/cgroup_freezer.c | 11 +++--------
kernel/cpuset.c | 31 ++++++++++---------------------
kernel/sched/core.c | 16 ++++------------
net/core/netprio_cgroup.c | 9 ++-------
net/sched/cls_cgroup.c | 9 ++-------
security/device_cgroup.c | 10 ++--------
8 files changed, 28 insertions(+), 78 deletions(-)
diff --git a/block/blk-cgroup.c b/block/blk-cgroup.c
index 1359d63..2a542b3 100644
--- a/block/blk-cgroup.c
+++ b/block/blk-cgroup.c
@@ -32,7 +32,6 @@ static struct cgroup_subsys_state *blkiocg_create(struct cgroup *);
static int blkiocg_can_attach(struct cgroup *, struct cgroup_taskset *);
static void blkiocg_attach(struct cgroup *, struct cgroup_taskset *);
static void blkiocg_destroy(struct cgroup *);
-static int blkiocg_populate(struct cgroup_subsys *, struct cgroup *);

/* for encoding cft->private value on file */
#define BLKIOFILE_PRIVATE(x, val) (((x) << 16) | (val))
@@ -46,7 +45,6 @@ struct cgroup_subsys blkio_subsys = {
.can_attach = blkiocg_can_attach,
.attach = blkiocg_attach,
.destroy = blkiocg_destroy,
- .populate = blkiocg_populate,
#ifdef CONFIG_BLK_CGROUP
/* note: blkio_subsys_id is otherwise defined in blk-cgroup.h */
.subsys_id = blkio_subsys_id,
@@ -1537,13 +1535,9 @@ struct cftype blkio_files[] = {
.read_map = blkiocg_file_read_map,
},
#endif
+ { } /* terminate */
};
-
-static int blkiocg_populate(struct cgroup_subsys *subsys, struct cgroup *cgroup)
-{
- return cgroup_add_files(cgroup, subsys, blkio_files,
- ARRAY_SIZE(blkio_files));
-}
+CGROUP_SUBSYS_CFTYPES(blkio_subsys, blkio_files);

static void blkiocg_destroy(struct cgroup *cgroup)
{
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index 6c396f3..20fdff9 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -5350,19 +5350,15 @@ static struct cftype debug_files[] = {
.name = "releasable",
.read_u64 = releasable_read,
},
-};

-static int debug_populate(struct cgroup_subsys *ss, struct cgroup *cont)
-{
- return cgroup_add_files(cont, ss, debug_files,
- ARRAY_SIZE(debug_files));
-}
+ { } /* terminate */
+};
+CGROUP_SUBSYS_CFTYPES(debug_subsys, debug_files);

struct cgroup_subsys debug_subsys = {
.name = "debug",
.create = debug_create,
.destroy = debug_destroy,
- .populate = debug_populate,
.subsys_id = debug_subsys_id,
};
#endif /* CONFIG_CGROUP_DEBUG */
diff --git a/kernel/cgroup_freezer.c b/kernel/cgroup_freezer.c
index f86e939..b89f7c4 100644
--- a/kernel/cgroup_freezer.c
+++ b/kernel/cgroup_freezer.c
@@ -358,23 +358,18 @@ static int freezer_write(struct cgroup *cgroup,
static struct cftype files[] = {
{
.name = "state",
+ .flags = CFTYPE_NOT_ON_ROOT,
.read_seq_string = freezer_read,
.write_string = freezer_write,
},
+ { } /* terminate */
};
-
-static int freezer_populate(struct cgroup_subsys *ss, struct cgroup *cgroup)
-{
- if (!cgroup->parent)
- return 0;
- return cgroup_add_files(cgroup, ss, files, ARRAY_SIZE(files));
-}
+CGROUP_SUBSYS_CFTYPES(freezer_subsys, files);

struct cgroup_subsys freezer_subsys = {
.name = "freezer",
.create = freezer_create,
.destroy = freezer_destroy,
- .populate = freezer_populate,
.subsys_id = freezer_subsys_id,
.can_attach = freezer_can_attach,
.fork = freezer_fork,
diff --git a/kernel/cpuset.c b/kernel/cpuset.c
index 5d57583..2e38198 100644
--- a/kernel/cpuset.c
+++ b/kernel/cpuset.c
@@ -1792,28 +1792,18 @@ static struct cftype files[] = {
.write_u64 = cpuset_write_u64,
.private = FILE_SPREAD_SLAB,
},
-};
-
-static struct cftype cft_memory_pressure_enabled = {
- .name = "memory_pressure_enabled",
- .read_u64 = cpuset_read_u64,
- .write_u64 = cpuset_write_u64,
- .private = FILE_MEMORY_PRESSURE_ENABLED,
-};

-static int cpuset_populate(struct cgroup_subsys *ss, struct cgroup *cont)
-{
- int err;
+ {
+ .name = "memory_pressure_enabled",
+ .flags = CFTYPE_ONLY_ON_ROOT,
+ .read_u64 = cpuset_read_u64,
+ .write_u64 = cpuset_write_u64,
+ .private = FILE_MEMORY_PRESSURE_ENABLED,
+ },

- err = cgroup_add_files(cont, ss, files, ARRAY_SIZE(files));
- if (err)
- return err;
- /* memory_pressure_enabled is in root cpuset only */
- if (!cont->parent)
- err = cgroup_add_file(cont, ss,
- &cft_memory_pressure_enabled);
- return err;
-}
+ { } /* terminate */
+};
+CGROUP_SUBSYS_CFTYPES(cpuset_subsys, files);

/*
* post_clone() is called during cgroup_create() when the
@@ -1914,7 +1904,6 @@ struct cgroup_subsys cpuset_subsys = {
.destroy = cpuset_destroy,
.can_attach = cpuset_can_attach,
.attach = cpuset_attach,
- .populate = cpuset_populate,
.post_clone = cpuset_post_clone,
.subsys_id = cpuset_subsys_id,
.early_init = 1,
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index ff12f72..4d69359 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -7902,12 +7902,9 @@ static struct cftype cpu_files[] = {
.write_u64 = cpu_rt_period_write_uint,
},
#endif
+ { } /* terminate */
};
-
-static int cpu_cgroup_populate(struct cgroup_subsys *ss, struct cgroup *cont)
-{
- return cgroup_add_files(cont, ss, cpu_files, ARRAY_SIZE(cpu_files));
-}
+CGROUP_SUBSYS_CFTYPES(cpu_cgroup_subsys, cpu_files);

struct cgroup_subsys cpu_cgroup_subsys = {
.name = "cpu",
@@ -7916,7 +7913,6 @@ struct cgroup_subsys cpu_cgroup_subsys = {
.can_attach = cpu_cgroup_can_attach,
.attach = cpu_cgroup_attach,
.exit = cpu_cgroup_exit,
- .populate = cpu_cgroup_populate,
.subsys_id = cpu_cgroup_subsys_id,
.early_init = 1,
};
@@ -8102,12 +8098,9 @@ static struct cftype files[] = {
.name = "stat",
.read_map = cpuacct_stats_show,
},
+ { } /* terminate */
};
-
-static int cpuacct_populate(struct cgroup_subsys *ss, struct cgroup *cgrp)
-{
- return cgroup_add_files(cgrp, ss, files, ARRAY_SIZE(files));
-}
+CGROUP_SUBSYS_CFTYPES(cpuacct_subsys, files);

/*
* charge this task's execution time to its accounting group.
@@ -8140,7 +8133,6 @@ struct cgroup_subsys cpuacct_subsys = {
.name = "cpuacct",
.create = cpuacct_create,
.destroy = cpuacct_destroy,
- .populate = cpuacct_populate,
.subsys_id = cpuacct_subsys_id,
};
#endif /* CONFIG_CGROUP_CPUACCT */
diff --git a/net/core/netprio_cgroup.c b/net/core/netprio_cgroup.c
index 22036ab..1aee978 100644
--- a/net/core/netprio_cgroup.c
+++ b/net/core/netprio_cgroup.c
@@ -25,13 +25,11 @@

static struct cgroup_subsys_state *cgrp_create(struct cgroup *cgrp);
static void cgrp_destroy(struct cgroup *cgrp);
-static int cgrp_populate(struct cgroup_subsys *ss, struct cgroup *cgrp);

struct cgroup_subsys net_prio_subsys = {
.name = "net_prio",
.create = cgrp_create,
.destroy = cgrp_destroy,
- .populate = cgrp_populate,
#ifdef CONFIG_NETPRIO_CGROUP
.subsys_id = net_prio_subsys_id,
#endif
@@ -256,12 +254,9 @@ static struct cftype ss_files[] = {
.read_map = read_priomap,
.write_string = write_priomap,
},
+ { } /* terminate */
};
-
-static int cgrp_populate(struct cgroup_subsys *ss, struct cgroup *cgrp)
-{
- return cgroup_add_files(cgrp, ss, ss_files, ARRAY_SIZE(ss_files));
-}
+CGROUP_SUBSYS_CFTYPES(net_prio_subsys, ss_files);

static int netprio_device_event(struct notifier_block *unused,
unsigned long event, void *ptr)
diff --git a/net/sched/cls_cgroup.c b/net/sched/cls_cgroup.c
index 1afaa28..1a856d8 100644
--- a/net/sched/cls_cgroup.c
+++ b/net/sched/cls_cgroup.c
@@ -24,13 +24,11 @@

static struct cgroup_subsys_state *cgrp_create(struct cgroup *cgrp);
static void cgrp_destroy(struct cgroup *cgrp);
-static int cgrp_populate(struct cgroup_subsys *ss, struct cgroup *cgrp);

struct cgroup_subsys net_cls_subsys = {
.name = "net_cls",
.create = cgrp_create,
.destroy = cgrp_destroy,
- .populate = cgrp_populate,
#ifdef CONFIG_NET_CLS_CGROUP
.subsys_id = net_cls_subsys_id,
#endif
@@ -86,12 +84,9 @@ static struct cftype ss_files[] = {
.read_u64 = read_classid,
.write_u64 = write_classid,
},
+ { } /* terminate */
};
-
-static int cgrp_populate(struct cgroup_subsys *ss, struct cgroup *cgrp)
-{
- return cgroup_add_files(cgrp, ss, ss_files, ARRAY_SIZE(ss_files));
-}
+CGROUP_SUBSYS_CFTYPES(net_cls_subsys, ss_files);

struct cls_cgroup_head {
u32 handle;
diff --git a/security/device_cgroup.c b/security/device_cgroup.c
index c43a332..11cf061 100644
--- a/security/device_cgroup.c
+++ b/security/device_cgroup.c
@@ -447,21 +447,15 @@ static struct cftype dev_cgroup_files[] = {
.read_seq_string = devcgroup_seq_read,
.private = DEVCG_LIST,
},
+ { } /* terminate */
};
-
-static int devcgroup_populate(struct cgroup_subsys *ss,
- struct cgroup *cgroup)
-{
- return cgroup_add_files(cgroup, ss, dev_cgroup_files,
- ARRAY_SIZE(dev_cgroup_files));
-}
+CGROUP_SUBSYS_CFTYPES(devices_subsys, dev_cgroup_files);

struct cgroup_subsys devices_subsys = {
.name = "devices",
.can_attach = devcgroup_can_attach,
.create = devcgroup_create,
.destroy = devcgroup_destroy,
- .populate = devcgroup_populate,
.subsys_id = devices_subsys_id,
};

--
1.7.7.3


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