spinlock_t *old_ptl, *new_ptl;
/*
- * When need_rmap_locks is true, we take the i_mmap_mutex and anon_vma
+ * When need_rmap_locks is true, we take the i_mmap_rwsem and anon_vma
* locks to ensure that rmap will always observe either the old or the
* new ptes. This is the easiest way to avoid races with
* truncate_pagecache(), page migration, etc...
if (need_rmap_locks) {
if (vma->vm_file) {
mapping = vma->vm_file->f_mapping;
- mutex_lock(&mapping->i_mmap_mutex);
+ i_mmap_lock_write(mapping);
}
if (vma->anon_vma) {
anon_vma = vma->anon_vma;
if (anon_vma)
anon_vma_unlock_write(anon_vma);
if (mapping)
- mutex_unlock(&mapping->i_mmap_mutex);
+ i_mmap_unlock_write(mapping);
}
#define LATENCY_LIMIT (64 * PAGE_SIZE)
old_len = new_len;
old_addr = new_addr;
new_addr = -ENOMEM;
- }
+ } else if (vma->vm_file && vma->vm_file->f_op->mremap)
+ vma->vm_file->f_op->mremap(vma->vm_file, new_vma);
/* Conceal VM_ACCOUNT so old reservation is not undone */
if (vm_flags & VM_ACCOUNT) {