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cgroup/bfq: revert bfq.weight symlink change

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There's some discussion on how to do this the best, and Tejun prefers
that BFQ just create the file itself instead of having cgroups support
a symlink feature.

Hence revert commit 54b7b868e8 and 19e9da9e86 for 5.2, and this
can be done properly for 5.3.

Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe
2019-06-10 03:35:41 -06:00
parent d1fdb6d8f6
commit cf8929885d
3 changed files with 6 additions and 36 deletions
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33
kernel/cgroup/cgroup.c
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@@ -1460,8 +1460,8 @@ struct cgroup *task_cgroup_from_root(struct task_struct *task,
static struct kernfs_syscall_ops cgroup_kf_syscall_ops;
static char *cgroup_fill_name(struct cgroup *cgrp, const struct cftype *cft,
char *buf, bool write_link_name)
static char *cgroup_file_name(struct cgroup *cgrp, const struct cftype *cft,
char *buf)
{
struct cgroup_subsys *ss = cft->ss;
@@ -1471,26 +1471,13 @@ static char *cgroup_fill_name(struct cgroup *cgrp, const struct cftype *cft,
snprintf(buf, CGROUP_FILE_NAME_MAX, "%s%s.%s",
dbg, cgroup_on_dfl(cgrp) ? ss->name : ss->legacy_name,
write_link_name ? cft->link_name : cft->name);
cft->name);
} else {
strscpy(buf, write_link_name ? cft->link_name : cft->name,
CGROUP_FILE_NAME_MAX);
strscpy(buf, cft->name, CGROUP_FILE_NAME_MAX);
}
return buf;
}
static char *cgroup_file_name(struct cgroup *cgrp, const struct cftype *cft,
char *buf)
{
return cgroup_fill_name(cgrp, cft, buf, false);
}
static char *cgroup_link_name(struct cgroup *cgrp, const struct cftype *cft,
char *buf)
{
return cgroup_fill_name(cgrp, cft, buf, true);
}
/**
* cgroup_file_mode - deduce file mode of a control file
* @cft: the control file in question
@@ -1649,9 +1636,6 @@ static void cgroup_rm_file(struct cgroup *cgrp, const struct cftype *cft)
}
kernfs_remove_by_name(cgrp->kn, cgroup_file_name(cgrp, cft, name));
if (cft->flags & CFTYPE_SYMLINKED)
kernfs_remove_by_name(cgrp->kn,
cgroup_link_name(cgrp, cft, name));
}
/**
@@ -3837,7 +3821,6 @@ static int cgroup_add_file(struct cgroup_subsys_state *css, struct cgroup *cgrp,
{
char name[CGROUP_FILE_NAME_MAX];
struct kernfs_node *kn;
struct kernfs_node *kn_link;
struct lock_class_key *key = NULL;
int ret;
@@ -3868,14 +3851,6 @@ static int cgroup_add_file(struct cgroup_subsys_state *css, struct cgroup *cgrp,
spin_unlock_irq(&cgroup_file_kn_lock);
}
if (cft->flags & CFTYPE_SYMLINKED) {
kn_link = kernfs_create_link(cgrp->kn,
cgroup_link_name(cgrp, cft, name),
kn);
if (IS_ERR(kn_link))
return PTR_ERR(kn_link);
}
return 0;
}