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BACKPORT: cgroup: Explicitly remove core interface files

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The "cgroup." core interface files bypass the usual interface removal
path and get removed recursively along with the cgroup itself.  While
this works now, the subtle discrepancy gets in the way of implementing
common mechanisms.

This patch updates cgroup core interface file handling so that it's
consistent with controller interface files.  When added, the css is
marked CSS_VISIBLE and they're explicitly removed before the cgroup is
destroyed.

This doesn't cause user-visible behavior changes.

Signed-off-by: Tejun Heo <tj@kernel.org>
Change-Id: I4091581388cb1514171d6de8fdac5f0fe6ae1695
(cherry picked from commit 5faaf05f2976fd9ec0ecd582bcfb3a41cde4c65e)
Bug: 154548692
Signed-off-by: Marco Ballesio <balejs@google.com>
(cherry picked from commit 1c95325d9b62e843a2bfca3a8a3b5d7b11deebb1)
Signed-off-by: Panchajanya1999 <panchajanya@azure-dev.live>
Signed-off-by: Adithya R <gh0strider.2k18.reborn@gmail.com>
This commit is contained in:
Tejun Heo 2018-04-26 14:29:04 -07:00 committed by Adithya R
parent ea1587274f
commit 0aea305780
1 changed files with 22 additions and 13 deletions
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23
kernel/cgroup/cgroup.c
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@ -1555,9 +1555,18 @@ static void css_clear_dir(struct cgroup_subsys_state *css)
css->flags &= ~CSS_VISIBLE;
if (!css->ss) {
if (cgroup_on_dfl(cgrp))
cfts = cgroup_base_files;
else
cfts = cgroup1_base_files;
cgroup_addrm_files(css, cgrp, cfts, false);
} else {
list_for_each_entry(cfts, &css->ss->cfts, node)
cgroup_addrm_files(css, cgrp, cfts, false);
}
}
/**
* css_populate_dir - create subsys files in a cgroup directory
@ -1580,9 +1589,10 @@ static int css_populate_dir(struct cgroup_subsys_state *css)
else
cfts = cgroup1_base_files;
return cgroup_addrm_files(&cgrp->self, cgrp, cfts, true);
}
ret = cgroup_addrm_files(&cgrp->self, cgrp, cfts, true);
if (ret < 0)
return ret;
} else {
list_for_each_entry(cfts, &css->ss->cfts, node) {
ret = cgroup_addrm_files(css, cgrp, cfts, true);
if (ret < 0) {
@ -1590,6 +1600,7 @@ static int css_populate_dir(struct cgroup_subsys_state *css)
goto err;
}
}
}
css->flags |= CSS_VISIBLE;
@ -5215,10 +5226,8 @@ static int cgroup_destroy_locked(struct cgroup *cgrp)
for_each_css(css, ssid, cgrp)
kill_css(css);
/*
* Remove @cgrp directory along with the base files. @cgrp has an
* extra ref on its kn.
*/
/* clear and remove @cgrp dir, @cgrp has an extra ref on its kn */
css_clear_dir(&cgrp->self);
kernfs_remove(cgrp->kn);
if (parent && cgroup_is_threaded(cgrp))