What locks are needed to safely use vma->vm_file ?
From: Jose Luis Marchetti
Date: Tue May 11 2010 - 00:57:01 EST
Hi,
It appears that doing down_read(&mm->mmap_sem) is enough to safely use vma->vm_file, is it correct ?
Also in the lock subject, to get to all vm_files in the system, is the following correct or something is missing ?
read_lock(&tasklist_lock);
for_each_process(p)
{
mm = get_task_mm(p);
down_read(&mm->mmap_sem);
// ... Here what I need to do with this mm vm_file objects
up_read(&mm->mmap_sem);
mmput(mm);
}
read_unlock(&tasklist_lock);
Thanks in advance for your answer
José Luís Marchetti
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