diff options
| -rw-r--r-- | kernel/cgroup_freezer.c | 56 |
1 files changed, 28 insertions, 28 deletions
diff --git a/kernel/cgroup_freezer.c b/kernel/cgroup_freezer.c index df884022fbd..6e4280d7742 100644 --- a/kernel/cgroup_freezer.c +++ b/kernel/cgroup_freezer.c @@ -22,9 +22,9 @@ #include <linux/seq_file.h> enum freezer_state { - STATE_RUNNING = 0, - STATE_FREEZING, - STATE_FROZEN, + CGROUP_THAWED = 0, + CGROUP_FREEZING, + CGROUP_FROZEN, }; struct freezer { @@ -57,7 +57,7 @@ int cgroup_frozen(struct task_struct *task) state = freezer->state; task_unlock(task); - return state == STATE_FROZEN; + return state == CGROUP_FROZEN; } /* @@ -65,7 +65,7 @@ int cgroup_frozen(struct task_struct *task) * CGROUP_LOCAL_BUFFER_SIZE */ static const char *freezer_state_strs[] = { - "RUNNING", + "THAWED", "FREEZING", "FROZEN", }; @@ -75,10 +75,10 @@ static const char *freezer_state_strs[] = { * Transitions are caused by userspace writes to the freezer.state file. * The values in parenthesis are state labels. The rest are edge labels. * - * (RUNNING) --FROZEN--> (FREEZING) --FROZEN--> (FROZEN) - * ^ ^ | | - * | \_______RUNNING_______/ | - * \_____________________________RUNNING___________/ + * (THAWED) --FROZEN--> (FREEZING) --FROZEN--> (FROZEN) + * ^ ^ | | + * | \_______THAWED_______/ | + * \__________________________THAWED____________/ */ struct cgroup_subsys freezer_subsys; @@ -135,7 +135,7 @@ static struct cgroup_subsys_state *freezer_create(struct cgroup_subsys *ss, return ERR_PTR(-ENOMEM); spin_lock_init(&freezer->lock); - freezer->state = STATE_RUNNING; + freezer->state = CGROUP_THAWED; return &freezer->css; } @@ -170,13 +170,13 @@ static int freezer_can_attach(struct cgroup_subsys *ss, return -EBUSY; freezer = cgroup_freezer(new_cgroup); - if (freezer->state == STATE_FROZEN) + if (freezer->state == CGROUP_FROZEN) return -EBUSY; retval = 0; task_lock(task); freezer = task_freezer(task); - if (freezer->state == STATE_FROZEN) + if (freezer->state == CGROUP_FROZEN) retval = -EBUSY; task_unlock(task); return retval; @@ -190,10 +190,10 @@ static void freezer_fork(struct cgroup_subsys *ss, struct task_struct *task) freezer = task_freezer(task); task_unlock(task); - BUG_ON(freezer->state == STATE_FROZEN); + BUG_ON(freezer->state == CGROUP_FROZEN); spin_lock_irq(&freezer->lock); - /* Locking avoids race with FREEZING -> RUNNING transitions. */ - if (freezer->state == STATE_FREEZING) + /* Locking avoids race with FREEZING -> THAWED transitions. */ + if (freezer->state == CGROUP_FREEZING) freeze_task(task, true); spin_unlock_irq(&freezer->lock); } @@ -221,7 +221,7 @@ static void check_if_frozen(struct cgroup *cgroup, * tasks. */ if (nfrozen == ntotal) - freezer->state = STATE_FROZEN; + freezer->state = CGROUP_FROZEN; cgroup_iter_end(cgroup, &it); } @@ -237,7 +237,7 @@ static int freezer_read(struct cgroup *cgroup, struct cftype *cft, freezer = cgroup_freezer(cgroup); spin_lock_irq(&freezer->lock); state = freezer->state; - if (state == STATE_FREEZING) { + if (state == CGROUP_FREEZING) { /* We change from FREEZING to FROZEN lazily if the cgroup was * only partially frozen when we exitted write. */ check_if_frozen(cgroup, freezer); @@ -257,7 +257,7 @@ static int try_to_freeze_cgroup(struct cgroup *cgroup, struct freezer *freezer) struct task_struct *task; unsigned int num_cant_freeze_now = 0; - freezer->state = STATE_FREEZING; + freezer->state = CGROUP_FREEZING; cgroup_iter_start(cgroup, &it); while ((task = cgroup_iter_next(cgroup, &it))) { if (!freeze_task(task, true)) @@ -288,7 +288,7 @@ static int unfreeze_cgroup(struct cgroup *cgroup, struct freezer *freezer) wake_up_process(task); } cgroup_iter_end(cgroup, &it); - freezer->state = STATE_RUNNING; + freezer->state = CGROUP_THAWED; return 0; } @@ -305,18 +305,18 @@ static int freezer_change_state(struct cgroup *cgroup, if (goal_state == freezer->state) goto out; switch (freezer->state) { - case STATE_RUNNING: + case CGROUP_THAWED: retval = try_to_freeze_cgroup(cgroup, freezer); break; - case STATE_FREEZING: - if (goal_state == STATE_FROZEN) { + case CGROUP_FREEZING: + if (goal_state == CGROUP_FROZEN) { /* Userspace is retrying after * "/bin/echo FROZEN > freezer.state" returned -EBUSY */ retval = try_to_freeze_cgroup(cgroup, freezer); break; } - /* state == FREEZING and goal_state == RUNNING, so unfreeze */ - case STATE_FROZEN: + /* state == FREEZING and goal_state == THAWED, so unfreeze */ + case CGROUP_FROZEN: retval = unfreeze_cgroup(cgroup, freezer); break; default: @@ -335,10 +335,10 @@ static int freezer_write(struct cgroup *cgroup, int retval; enum freezer_state goal_state; - if (strcmp(buffer, freezer_state_strs[STATE_RUNNING]) == 0) - goal_state = STATE_RUNNING; - else if (strcmp(buffer, freezer_state_strs[STATE_FROZEN]) == 0) - goal_state = STATE_FROZEN; + if (strcmp(buffer, freezer_state_strs[CGROUP_THAWED]) == 0) + goal_state = CGROUP_THAWED; + else if (strcmp(buffer, freezer_state_strs[CGROUP_FROZEN]) == 0) + goal_state = CGROUP_FROZEN; else return -EIO; |