Merge branch 'for-2.6.24' of master.kernel.org:/pub/scm/linux/kernel/git/jwboyer...

[cascardo/linux.git] / fs / proc / base.c

diff --git a/fs/proc/base.c b/fs/proc/base.c
index 39a3d7c..a17c268 100644 (file)
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -2255,27 +2255,6 @@ static const struct inode_operations proc_tgid_base_inode_operations = {
        .setattr        = proc_setattr,
 };
 
-/**
- * proc_flush_task -  Remove dcache entries for @task from the /proc dcache.
- *
- * @task: task that should be flushed.
- *
- * Looks in the dcache for
- * /proc/@pid
- * /proc/@tgid/task/@pid
- * if either directory is present flushes it and all of it'ts children
- * from the dcache.
- *
- * It is safe and reasonable to cache /proc entries for a task until
- * that task exits.  After that they just clog up the dcache with
- * useless entries, possibly causing useful dcache entries to be
- * flushed instead.  This routine is proved to flush those useless
- * dcache entries at process exit time.
- *
- * NOTE: This routine is just an optimization so it does not guarantee
- *       that no dcache entries will exist at process exit time it
- *       just makes it very unlikely that any will persist.
- */
 static void proc_flush_task_mnt(struct vfsmount *mnt, pid_t pid, pid_t tgid)
 {
        struct dentry *dentry, *leader, *dir;
@@ -2322,29 +2301,45 @@ out:
        return;
 }
 
-/*
- * when flushing dentries from proc one need to flush them from global
+/**
+ * proc_flush_task -  Remove dcache entries for @task from the /proc dcache.
+ * @task: task that should be flushed.
+ *
+ * When flushing dentries from proc, one needs to flush them from global
  * proc (proc_mnt) and from all the namespaces' procs this task was seen
- * in. this call is supposed to make all this job.
+ * in. This call is supposed to do all of this job.
+ *
+ * Looks in the dcache for
+ * /proc/@pid
+ * /proc/@tgid/task/@pid
+ * if either directory is present flushes it and all of it'ts children
+ * from the dcache.
+ *
+ * It is safe and reasonable to cache /proc entries for a task until
+ * that task exits.  After that they just clog up the dcache with
+ * useless entries, possibly causing useful dcache entries to be
+ * flushed instead.  This routine is proved to flush those useless
+ * dcache entries at process exit time.
+ *
+ * NOTE: This routine is just an optimization so it does not guarantee
+ *       that no dcache entries will exist at process exit time it
+ *       just makes it very unlikely that any will persist.
  */
 
 void proc_flush_task(struct task_struct *task)
 {
-       int i, leader;
-       struct pid *pid, *tgid;
+       int i;
+       struct pid *pid, *tgid = NULL;
        struct upid *upid;
 
-       leader = thread_group_leader(task);
-       proc_flush_task_mnt(proc_mnt, task->pid, leader ? task->tgid : 0);
        pid = task_pid(task);
-       if (pid->level == 0)
-               return;
+       if (thread_group_leader(task))
+               tgid = task_tgid(task);
 
-       tgid = task_tgid(task);
-       for (i = 1; i <= pid->level; i++) {
+       for (i = 0; i <= pid->level; i++) {
                upid = &pid->numbers[i];
                proc_flush_task_mnt(upid->ns->proc_mnt, upid->nr,
-                               leader ? 0 : tgid->numbers[i].nr);
+                       tgid ? tgid->numbers[i].nr : 0);
        }
 
        upid = &pid->numbers[pid->level];