cgroup: rename CGRP_REMOVED to CGRP_DEAD

We will add another flag indicating that the cgroup is in the process
of being killed.  REMOVING / REMOVED is more difficult to distinguish
and cgroup_is_removing()/cgroup_is_removed() are a bit awkward.  Also,
later percpu_ref usage will involve "kill"ing the refcnt.

 s/CGRP_REMOVED/CGRP_DEAD/
 s/cgroup_is_removed()/cgroup_is_dead()

This patch is purely cosmetic.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Li Zefan <lizefan@huawei.com>

1 files changed, 14 insertions, 16 deletions

diff --git a/kernel/cgroup.c b/kernel/cgroup.c
index d86a8477d56a..84efb344fdf6 100644
--- a/kernel/cgroup.c
+++ b/kernel/cgroup.c
@@ -226,9 +226,9 @@ static int css_refcnt(struct cgroup_subsys_state *css)
 }
 
 /* convenient tests for these bits */
-static inline bool cgroup_is_removed(const struct cgroup *cgrp)
+static inline bool cgroup_is_dead(const struct cgroup *cgrp)
 {
-        return test_bit(CGRP_REMOVED, &cgrp->flags);
+        return test_bit(CGRP_DEAD, &cgrp->flags);
 }
 
 /**
@@ -300,7 +300,7 @@ static inline struct cftype *__d_cft(struct dentry *dentry)
 static bool cgroup_lock_live_group(struct cgroup *cgrp)
 {
         mutex_lock(&cgroup_mutex);
-        if (cgroup_is_removed(cgrp)) {
+        if (cgroup_is_dead(cgrp)) {
                 mutex_unlock(&cgroup_mutex);
                 return false;
         }
@@ -892,7 +892,7 @@ static void cgroup_diput(struct dentry *dentry, struct inode *inode)
         if (S_ISDIR(inode->i_mode)) {
                 struct cgroup *cgrp = dentry->d_fsdata;
 
-                BUG_ON(!(cgroup_is_removed(cgrp)));
+                BUG_ON(!(cgroup_is_dead(cgrp)));
                 call_rcu(&cgrp->rcu_head, cgroup_free_rcu);
         } else {
                 struct cfent *cfe = __d_cfe(dentry);
@@ -2363,7 +2363,7 @@ static ssize_t cgroup_file_write(struct file *file, const char __user *buf,
         struct cftype *cft = __d_cft(file->f_dentry);
         struct cgroup *cgrp = __d_cgrp(file->f_dentry->d_parent);
 
-        if (cgroup_is_removed(cgrp))
+        if (cgroup_is_dead(cgrp))
                 return -ENODEV;
         if (cft->write)
                 return cft->write(cgrp, cft, file, buf, nbytes, ppos);
@@ -2408,7 +2408,7 @@ static ssize_t cgroup_file_read(struct file *file, char __user *buf,
         struct cftype *cft = __d_cft(file->f_dentry);
         struct cgroup *cgrp = __d_cgrp(file->f_dentry->d_parent);
 
-        if (cgroup_is_removed(cgrp))
+        if (cgroup_is_dead(cgrp))
                 return -ENODEV;
 
         if (cft->read)
@@ -2831,7 +2831,7 @@ static void cgroup_cfts_commit(struct cgroup_subsys *ss,
 
                 mutex_lock(&inode->i_mutex);
                 mutex_lock(&cgroup_mutex);
-                if (!cgroup_is_removed(cgrp))
+                if (!cgroup_is_dead(cgrp))
                         cgroup_addrm_files(cgrp, ss, cfts, is_add);
                 mutex_unlock(&cgroup_mutex);
                 mutex_unlock(&inode->i_mutex);
@@ -2999,14 +2999,14 @@ struct cgroup *cgroup_next_sibling(struct cgroup *pos)
         /*
          * @pos could already have been removed.  Once a cgroup is removed,
          * its ->sibling.next is no longer updated when its next sibling
-         * changes.  As CGRP_REMOVED is set on removal which is fully
+         * changes.  As CGRP_DEAD is set on removal which is fully
          * serialized, if we see it unasserted, it's guaranteed that the
          * next sibling hasn't finished its grace period even if it's
          * already removed, and thus safe to dereference from this RCU
          * critical section.  If ->sibling.next is inaccessible,
-         * cgroup_is_removed() is guaranteed to be visible as %true here.
+         * cgroup_is_dead() is guaranteed to be visible as %true here.
          */
-        if (likely(!cgroup_is_removed(pos))) {
+        if (likely(!cgroup_is_dead(pos))) {
                 next = list_entry_rcu(pos->sibling.next, struct cgroup, sibling);
                 if (&next->sibling != &pos->parent->children)
                         return next;
@@ -4383,7 +4383,7 @@ static int cgroup_destroy_locked(struct cgroup *cgrp)
          * attempts fail thus maintaining the removal conditions verified
          * above.
          *
-         * Note that CGRP_REMVOED clearing is depended upon by
+         * Note that CGRP_DEAD assertion is depended upon by
          * cgroup_next_sibling() to resume iteration after dropping RCU
          * read lock.  See cgroup_next_sibling() for details.
          */
@@ -4393,7 +4393,7 @@ static int cgroup_destroy_locked(struct cgroup *cgrp)
                 WARN_ON(atomic_read(&css->refcnt) < 0);
                 atomic_add(CSS_DEACT_BIAS, &css->refcnt);
         }
-        set_bit(CGRP_REMOVED, &cgrp->flags);
+        set_bit(CGRP_DEAD, &cgrp->flags);
 
         /* tell subsystems to initate destruction */
         for_each_subsys(cgrp->root, ss)
@@ -5063,7 +5063,7 @@ static void check_for_release(struct cgroup *cgrp)
                 int need_schedule_work = 0;
 
                 raw_spin_lock(&release_list_lock);
-                if (!cgroup_is_removed(cgrp) &&
+                if (!cgroup_is_dead(cgrp) &&
                     list_empty(&cgrp->release_list)) {
                         list_add(&cgrp->release_list, &release_list);
                         need_schedule_work = 1;
@@ -5209,9 +5209,7 @@ __setup("cgroup_disable=", cgroup_disable);
  * Functons for CSS ID.
  */
 
-/*
- *To get ID other than 0, this should be called when !cgroup_is_removed().
- */
+/* to get ID other than 0, this should be called when !cgroup_is_dead() */
 unsigned short css_id(struct cgroup_subsys_state *css)
 {
         struct css_id *cssid;