summaryrefslogtreecommitdiff
path: root/kernel/cgroup.c
diff options
context:
space:
mode:
authorTejun Heo <tj@kernel.org>2013-04-14 20:15:25 -0700
committerTejun Heo <tj@kernel.org>2013-04-14 20:15:25 -0700
commit9343862945fdd3dd5cb7648bb24cabe40faa9ad9 (patch)
treeeec00bc0446ff00699dd9a4e3128d888aec93f91 /kernel/cgroup.c
parentda1f296fd2bfd5ad3c53d72a1ece593e821cf374 (diff)
cgroup: convert cgroupfs_root flag bits to masks and add CGRP_ prefix
There's no reason to be using bitops, which tends to be more cumbersome, to handle root flags. Convert them to masks. Also, as they'll be moved to include/linux/cgroup.h and it's generally a good idea, add CGRP_ prefix. Note that flags are assigned from (1 << 1). The first bit will be used by a flag which will be added soon. Signed-off-by: Tejun Heo <tj@kernel.org> Acked-by: Serge E. Hallyn <serge.hallyn@ubuntu.com> Acked-by: Li Zefan <lizefan@huawei.com>
Diffstat (limited to 'kernel/cgroup.c')
-rw-r--r--kernel/cgroup.c21
1 files changed, 10 insertions, 11 deletions
diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index faf55f59646b..67428d84e38b 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -296,10 +296,10 @@ bool cgroup_is_descendant(struct cgroup *cgrp, struct cgroup *ancestor)
}
EXPORT_SYMBOL_GPL(cgroup_is_descendant);
-/* bits in struct cgroupfs_root flags field */
+/* cgroupfs_root->flags */
enum {
- ROOT_NOPREFIX, /* mounted subsystems have no named prefix */
- ROOT_XATTR, /* supports extended attributes */
+ CGRP_ROOT_NOPREFIX = (1 << 1), /* mounted subsystems have no named prefix */
+ CGRP_ROOT_XATTR = (1 << 2), /* supports extended attributes */
};
static int cgroup_is_releasable(const struct cgroup *cgrp)
@@ -1137,9 +1137,9 @@ static int cgroup_show_options(struct seq_file *seq, struct dentry *dentry)
mutex_lock(&cgroup_root_mutex);
for_each_subsys(root, ss)
seq_printf(seq, ",%s", ss->name);
- if (test_bit(ROOT_NOPREFIX, &root->flags))
+ if (root->flags & CGRP_ROOT_NOPREFIX)
seq_puts(seq, ",noprefix");
- if (test_bit(ROOT_XATTR, &root->flags))
+ if (root->flags & CGRP_ROOT_XATTR)
seq_puts(seq, ",xattr");
if (strlen(root->release_agent_path))
seq_printf(seq, ",release_agent=%s", root->release_agent_path);
@@ -1202,7 +1202,7 @@ static int parse_cgroupfs_options(char *data, struct cgroup_sb_opts *opts)
continue;
}
if (!strcmp(token, "noprefix")) {
- set_bit(ROOT_NOPREFIX, &opts->flags);
+ opts->flags |= CGRP_ROOT_NOPREFIX;
continue;
}
if (!strcmp(token, "clone_children")) {
@@ -1210,7 +1210,7 @@ static int parse_cgroupfs_options(char *data, struct cgroup_sb_opts *opts)
continue;
}
if (!strcmp(token, "xattr")) {
- set_bit(ROOT_XATTR, &opts->flags);
+ opts->flags |= CGRP_ROOT_XATTR;
continue;
}
if (!strncmp(token, "release_agent=", 14)) {
@@ -1293,8 +1293,7 @@ static int parse_cgroupfs_options(char *data, struct cgroup_sb_opts *opts)
* with the old cpuset, so we allow noprefix only if mounting just
* the cpuset subsystem.
*/
- if (test_bit(ROOT_NOPREFIX, &opts->flags) &&
- (opts->subsys_mask & mask))
+ if ((opts->flags & CGRP_ROOT_NOPREFIX) && (opts->subsys_mask & mask))
return -EINVAL;
@@ -2526,7 +2525,7 @@ static struct simple_xattrs *__d_xattrs(struct dentry *dentry)
static inline int xattr_enabled(struct dentry *dentry)
{
struct cgroupfs_root *root = dentry->d_sb->s_fs_info;
- return test_bit(ROOT_XATTR, &root->flags);
+ return root->flags & CGRP_ROOT_XATTR;
}
static bool is_valid_xattr(const char *name)
@@ -2698,7 +2697,7 @@ static int cgroup_add_file(struct cgroup *cgrp, struct cgroup_subsys *subsys,
simple_xattrs_init(&cft->xattrs);
- if (subsys && !test_bit(ROOT_NOPREFIX, &cgrp->root->flags)) {
+ if (subsys && !(cgrp->root->flags & CGRP_ROOT_NOPREFIX)) {
strcpy(name, subsys->name);
strcat(name, ".");
}