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cgroup: pass around cgroup_subsys_state instead of cgroup in file methods

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cgroup is currently in the process of transitioning to using struct
cgroup_subsys_state * as the primary handle instead of struct cgroup.
Please see the previous commit which converts the subsystem methods
for rationale.

This patch converts all cftype file operations to take @css instead of
@cgroup.  cftypes for the cgroup core files don't have their subsytem
pointer set.  These will automatically use the dummy_css added by the
previous patch and can be converted the same way.

Most subsystem conversions are straight forwards but there are some
interesting ones.

* freezer: update_if_frozen() is also converted to take @css instead
  of @cgroup for consistency.  This will make the code look simpler
  too once iterators are converted to use css.

* memory/vmpressure: mem_cgroup_from_css() needs to be exported to
  vmpressure while mem_cgroup_from_cont() can be made static.
  Updated accordingly.

* cpu: cgroup_tg() doesn't have any user left.  Removed.

* cpuacct: cgroup_ca() doesn't have any user left.  Removed.

* hugetlb: hugetlb_cgroup_form_cgroup() doesn't have any user left.
  Removed.

* net_cls: cgrp_cls_state() doesn't have any user left.  Removed.

Signed-off-by: Tejun Heo <[email protected]>
Acked-by: Li Zefan <[email protected]>
Acked-by: Michal Hocko <[email protected]>
Acked-by: Vivek Goyal <[email protected]>
Acked-by: Aristeu Rozanski <[email protected]>
Acked-by: Daniel Wagner <[email protected]>
Cc: Peter Zijlstra <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Balbir Singh <[email protected]>
Cc: Matt Helsley <[email protected]>
Cc: Jens Axboe <[email protected]>
Cc: Steven Rostedt <[email protected]>
This commit is contained in:
Tejun Heo 2013-08-08 20:11:24 -04:00
commit 182446d087
17 changed files with 322 additions and 328 deletions
Download patch file Download diff file Expand all files Collapse all files

35
kernel/cpuset.c
View file

@ -1603,9 +1603,10 @@ typedef enum {
FILE_SPREAD_SLAB,
} cpuset_filetype_t;
static int cpuset_write_u64(struct cgroup *cgrp, struct cftype *cft, u64 val)
static int cpuset_write_u64(struct cgroup_subsys_state *css, struct cftype *cft,
u64 val)
{
struct cpuset *cs = cgroup_cs(cgrp);
struct cpuset *cs = css_cs(css);
cpuset_filetype_t type = cft->private;
int retval = -ENODEV;
@ -1650,9 +1651,10 @@ out_unlock:
return retval;
}
static int cpuset_write_s64(struct cgroup *cgrp, struct cftype *cft, s64 val)
static int cpuset_write_s64(struct cgroup_subsys_state *css, struct cftype *cft,
s64 val)
{
struct cpuset *cs = cgroup_cs(cgrp);
struct cpuset *cs = css_cs(css);
cpuset_filetype_t type = cft->private;
int retval = -ENODEV;
@ -1676,10 +1678,10 @@ out_unlock:
/*
* Common handling for a write to a "cpus" or "mems" file.
*/
static int cpuset_write_resmask(struct cgroup *cgrp, struct cftype *cft,
const char *buf)
static int cpuset_write_resmask(struct cgroup_subsys_state *css,
struct cftype *cft, const char *buf)
{
struct cpuset *cs = cgroup_cs(cgrp);
struct cpuset *cs = css_cs(css);
struct cpuset *trialcs;
int retval = -ENODEV;
@ -1758,13 +1760,12 @@ static size_t cpuset_sprintf_memlist(char *page, struct cpuset *cs)
return count;
}
static ssize_t cpuset_common_file_read(struct cgroup *cgrp,
struct cftype *cft,
struct file *file,
char __user *buf,
size_t nbytes, loff_t *ppos)
static ssize_t cpuset_common_file_read(struct cgroup_subsys_state *css,
struct cftype *cft, struct file *file,
char __user *buf, size_t nbytes,
loff_t *ppos)
{
struct cpuset *cs = cgroup_cs(cgrp);
struct cpuset *cs = css_cs(css);
cpuset_filetype_t type = cft->private;
char *page;
ssize_t retval = 0;
@ -1794,9 +1795,9 @@ out:
return retval;
}
static u64 cpuset_read_u64(struct cgroup *cgrp, struct cftype *cft)
static u64 cpuset_read_u64(struct cgroup_subsys_state *css, struct cftype *cft)
{
struct cpuset *cs = cgroup_cs(cgrp);
struct cpuset *cs = css_cs(css);
cpuset_filetype_t type = cft->private;
switch (type) {
case FILE_CPU_EXCLUSIVE:
@ -1825,9 +1826,9 @@ static u64 cpuset_read_u64(struct cgroup *cgrp, struct cftype *cft)
return 0;
}
static s64 cpuset_read_s64(struct cgroup *cgrp, struct cftype *cft)
static s64 cpuset_read_s64(struct cgroup_subsys_state *css, struct cftype *cft)
{
struct cpuset *cs = cgroup_cs(cgrp);
struct cpuset *cs = css_cs(css);
cpuset_filetype_t type = cft->private;
switch (type) {
case FILE_SCHED_RELAX_DOMAIN_LEVEL: