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From b7f71899fbdba1cac6773a62ed4ea841b7eda6b0 Mon Sep 17 00:00:00 2001
From: Jens Axboe <axboe@kernel.dk>
Date: Mon, 10 Jun 2019 03:35:41 -0600
Subject: [PATCH] cgroup/bfq: revert bfq.weight symlink change
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 54b7b868e826 and 19e9da9e86c4 for 5.2, and this
can be done properly for 5.3.
Signed-off-by: Jens Axboe <axboe@kernel.dk>
(cherry picked from commit cf8929885de318c0bf73438c9e5dde59d6536f7c)
Signed-off-by: Li Yang <leoyang.li@nxp.com>
---
include/linux/cgroup-defs.h | 3 ---
kernel/cgroup/cgroup.c | 33 ++++-----------------------------
2 files changed, 4 insertions(+), 32 deletions(-)
--- a/include/linux/cgroup-defs.h
+++ b/include/linux/cgroup-defs.h
@@ -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 */
@@ -546,7 +544,6 @@ struct cftype {
* end of cftype array.
*/
char name[MAX_CFTYPE_NAME];
- char link_name[MAX_CFTYPE_NAME];
unsigned long private;
/*
--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c
@@ -1465,8 +1465,8 @@ struct cgroup *task_cgroup_from_root(str
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;
@@ -1476,26 +1476,13 @@ static char *cgroup_fill_name(struct cgr
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
@@ -1654,9 +1641,6 @@ static void cgroup_rm_file(struct cgroup
}
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));
}
/**
@@ -3887,7 +3871,6 @@ static int cgroup_add_file(struct cgroup
{
char name[CGROUP_FILE_NAME_MAX];
struct kernfs_node *kn;
- struct kernfs_node *kn_link;
struct lock_class_key *key = NULL;
int ret;
@@ -3918,14 +3901,6 @@ static int cgroup_add_file(struct cgroup
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;
}
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