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cgroup: make CFTYPE_ONLY_ON_DFL and CFTYPE_NO_ internal to cgroup core

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cgroup now distinguishes cftypes for the default and legacy
hierarchies more explicitly by using separate arrays and
CFTYPE_ONLY_ON_DFL and CFTYPE_INSANE should be and are used only
inside cgroup core proper.  Let's make it clear that the flags are
internal by prefixing them with double underscores.

CFTYPE_INSANE is renamed to __CFTYPE_NOT_ON_DFL for consistency.  The
two flags are also collected and assigned bits >= 16 so that they
aren't mixed with the published flags.

v2: Convert the extra ones in cgroup_exit_cftypes() which are added by
    revision to the previous patch.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>
This commit is contained in:
Tejun Heo 2014-07-15 11:05:10 -04:00
parent a8ddc8215e
commit 05ebb6e60f
2 changed files with 9 additions and 7 deletions
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6
include/linux/cgroup.h
View file

@ -384,9 +384,11 @@ struct css_set {
enum { enum {
CFTYPE_ONLY_ON_ROOT = (1 << 0), /* only create on root cgrp */ CFTYPE_ONLY_ON_ROOT = (1 << 0), /* only create on root cgrp */
CFTYPE_NOT_ON_ROOT = (1 << 1), /* don't create on root cgrp */ CFTYPE_NOT_ON_ROOT = (1 << 1), /* don't create on root cgrp */
CFTYPE_INSANE = (1 << 2), /* don't create if sane_behavior */
CFTYPE_NO_PREFIX = (1 << 3), /* (DON'T USE FOR NEW FILES) no subsys prefix */ CFTYPE_NO_PREFIX = (1 << 3), /* (DON'T USE FOR NEW FILES) no subsys prefix */
CFTYPE_ONLY_ON_DFL = (1 << 4), /* only on default hierarchy */
/* internal flags, do not use outside cgroup core proper */
__CFTYPE_ONLY_ON_DFL = (1 << 16), /* only on default hierarchy */
__CFTYPE_NOT_ON_DFL = (1 << 17), /* not on default hierarchy */
}; };
#define MAX_CFTYPE_NAME 64 #define MAX_CFTYPE_NAME 64

10
kernel/cgroup.c
View file

@ -3031,9 +3031,9 @@ static int cgroup_addrm_files(struct cgroup *cgrp, struct cftype cfts[],
for (cft = cfts; cft->name[0] != '\0'; cft++) { for (cft = cfts; cft->name[0] != '\0'; cft++) {
/* does cft->flags tell us to skip this file on @cgrp? */ /* does cft->flags tell us to skip this file on @cgrp? */
if ((cft->flags & CFTYPE_ONLY_ON_DFL) && !cgroup_on_dfl(cgrp)) if ((cft->flags & __CFTYPE_ONLY_ON_DFL) && !cgroup_on_dfl(cgrp))
continue; continue;
if ((cft->flags & CFTYPE_INSANE) && cgroup_on_dfl(cgrp)) if ((cft->flags & __CFTYPE_NOT_ON_DFL) && cgroup_on_dfl(cgrp))
continue; continue;
if ((cft->flags & CFTYPE_NOT_ON_ROOT) && !cgroup_parent(cgrp)) if ((cft->flags & CFTYPE_NOT_ON_ROOT) && !cgroup_parent(cgrp))
continue; continue;
@ -3093,7 +3093,7 @@ static void cgroup_exit_cftypes(struct cftype *cfts)
cft->ss = NULL; cft->ss = NULL;
/* revert flags set by cgroup core while adding @cfts */ /* revert flags set by cgroup core while adding @cfts */
cft->flags &= ~(CFTYPE_ONLY_ON_DFL | CFTYPE_INSANE); cft->flags &= ~(__CFTYPE_ONLY_ON_DFL | __CFTYPE_NOT_ON_DFL);
} }
} }
@ -3217,7 +3217,7 @@ int cgroup_add_dfl_cftypes(struct cgroup_subsys *ss, struct cftype *cfts)
struct cftype *cft; struct cftype *cft;
for (cft = cfts; cft && cft->name[0] != '\0'; cft++) for (cft = cfts; cft && cft->name[0] != '\0'; cft++)
cft->flags |= CFTYPE_ONLY_ON_DFL; cft->flags |= __CFTYPE_ONLY_ON_DFL;
return cgroup_add_cftypes(ss, cfts); return cgroup_add_cftypes(ss, cfts);
} }
@ -3234,7 +3234,7 @@ int cgroup_add_legacy_cftypes(struct cgroup_subsys *ss, struct cftype *cfts)
struct cftype *cft; struct cftype *cft;
for (cft = cfts; cft && cft->name[0] != '\0'; cft++) for (cft = cfts; cft && cft->name[0] != '\0'; cft++)
cft->flags |= CFTYPE_INSANE; cft->flags |= __CFTYPE_NOT_ON_DFL;
return cgroup_add_cftypes(ss, cfts); return cgroup_add_cftypes(ss, cfts);
} }