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Merge branch 'for-3.10-fixes' into for-3.11

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Merging to receive 7805d000db ("cgroup: fix a subtle bug in descendant
pre-order walk") so that further iterator updates can build upon it.

Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Tejun Heo 2013-05-24 10:53:09 +09:00
commit 3f33e64f4a
2 changed files with 9 additions and 11 deletions
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2
include/linux/cgroup.h
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@ -709,7 +709,7 @@ struct cgroup *cgroup_rightmost_descendant(struct cgroup *pos);
* *
* If a subsystem synchronizes against the parent in its ->css_online() and * If a subsystem synchronizes against the parent in its ->css_online() and
* before starting iterating, and synchronizes against @pos on each * before starting iterating, and synchronizes against @pos on each
* iteration, any descendant cgroup which finished ->css_offline() is * iteration, any descendant cgroup which finished ->css_online() is
* guaranteed to be visible in the future iterations. * guaranteed to be visible in the future iterations.
* *
* In other words, the following guarantees that a descendant can't escape * In other words, the following guarantees that a descendant can't escape

18
kernel/cgroup.c
View file

@ -2736,13 +2736,14 @@ static int cgroup_add_file(struct cgroup *cgrp, struct cgroup_subsys *subsys,
goto out; goto out;
} }
cfe->type = (void *)cft;
cfe->dentry = dentry;
dentry->d_fsdata = cfe;
simple_xattrs_init(&cfe->xattrs);
mode = cgroup_file_mode(cft); mode = cgroup_file_mode(cft);
error = cgroup_create_file(dentry, mode | S_IFREG, cgrp->root->sb); error = cgroup_create_file(dentry, mode | S_IFREG, cgrp->root->sb);
if (!error) { if (!error) {
cfe->type = (void *)cft;
cfe->dentry = dentry;
dentry->d_fsdata = cfe;
simple_xattrs_init(&cfe->xattrs);
list_add_tail(&cfe->node, &parent->files); list_add_tail(&cfe->node, &parent->files);
cfe = NULL; cfe = NULL;
} }
@ -2990,11 +2991,8 @@ struct cgroup *cgroup_next_descendant_pre(struct cgroup *pos,
WARN_ON_ONCE(!rcu_read_lock_held()); WARN_ON_ONCE(!rcu_read_lock_held());
/* if first iteration, pretend we just visited @cgroup */ /* if first iteration, pretend we just visited @cgroup */
if (!pos) { if (!pos)
if (list_empty(&cgroup->children))
return NULL;
pos = cgroup; pos = cgroup;
}
/* visit the first child if exists */ /* visit the first child if exists */
next = list_first_or_null_rcu(&pos->children, struct cgroup, sibling); next = list_first_or_null_rcu(&pos->children, struct cgroup, sibling);
@ -3002,14 +3000,14 @@ struct cgroup *cgroup_next_descendant_pre(struct cgroup *pos,
return next; return next;
/* no child, visit my or the closest ancestor's next sibling */ /* no child, visit my or the closest ancestor's next sibling */
do { while (pos != cgroup) {
next = list_entry_rcu(pos->sibling.next, struct cgroup, next = list_entry_rcu(pos->sibling.next, struct cgroup,
sibling); sibling);
if (&next->sibling != &pos->parent->children) if (&next->sibling != &pos->parent->children)
return next; return next;
pos = pos->parent; pos = pos->parent;
} while (pos != cgroup); }
return NULL; return NULL;
} }