Quoting Tejun Heo (t...@kernel.org):
> 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 <t...@kernel.org>
This *is* much nicer to read, thanks.
Acked-by: Serge E. Hallyn <serge.hal...@ubuntu.com>
> ---
> kernel/cgroup.c | 21 ++++++++++-----------
> 1 file changed, 10 insertions(+), 11 deletions(-)
>
> diff --git a/kernel/cgroup.c b/kernel/cgroup.c
> index 678a22c..a372eaa 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;
>
>
> @@ -2523,7 +2522,7 @@ 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)
> @@ -2695,7 +2694,7 @@ 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, ".");
> }
> --
> 1.8.1.4
>
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