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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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6
block/bfq-cgroup.c
View File

@ -1046,8 +1046,7 @@ struct blkcg_policy blkcg_policy_bfq = {
struct cftype bfq_blkcg_legacy_files[] = {
{
.name = "bfq.weight",
.link_name = "weight",
.flags = CFTYPE_NOT_ON_ROOT | CFTYPE_SYMLINKED,
.flags = CFTYPE_NOT_ON_ROOT,
.seq_show = bfq_io_show_weight,
.write_u64 = bfq_io_set_weight_legacy,
},
@ -1167,8 +1166,7 @@ struct cftype bfq_blkcg_legacy_files[] = {
struct cftype bfq_blkg_files[] = {
{
.name = "bfq.weight",
.link_name = "weight",
.flags = CFTYPE_NOT_ON_ROOT | CFTYPE_SYMLINKED,
.flags = CFTYPE_NOT_ON_ROOT,
.seq_show = bfq_io_show_weight,
.write = bfq_io_set_weight,
},

3
include/linux/cgroup-defs.h
View File

@ -106,8 +106,6 @@ enum {
CFTYPE_WORLD_WRITABLE = (1 << 4), /* (DON'T USE FOR NEW FILES) S_IWUGO */
CFTYPE_DEBUG = (1 << 5), /* create when cgroup_debug */
CFTYPE_SYMLINKED = (1 << 6), /* pointed to by symlink too */
/* 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 */
@ -545,7 +543,6 @@ struct cftype {
* end of cftype array.
*/
char name[MAX_CFTYPE_NAME];
char link_name[MAX_CFTYPE_NAME];
unsigned long private;
/*

33
kernel/cgroup/cgroup.c
View File

@ -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;
}