diff options
| -rw-r--r-- | mm/fremap.c | 19 |
1 files changed, 19 insertions, 0 deletions
diff --git a/mm/fremap.c b/mm/fremap.c index 5f50d736a037..c395b1abf082 100644 --- a/mm/fremap.c +++ b/mm/fremap.c @@ -181,6 +181,25 @@ asmlinkage long sys_remap_file_pages(unsigned long start, unsigned long size, goto retry; } mapping = vma->vm_file->f_mapping; + /* + * page_mkclean doesn't work on nonlinear vmas, so if + * dirty pages need to be accounted, emulate with linear + * vmas. + */ + if (mapping_cap_account_dirty(mapping)) { + unsigned long addr; + + flags &= MAP_NONBLOCK; + addr = mmap_region(vma->vm_file, start, size, + flags, vma->vm_flags, pgoff, 1); + if (IS_ERR_VALUE(addr)) { + err = addr; + } else { + BUG_ON(addr != start); + err = 0; + } + goto out; + } spin_lock(&mapping->i_mmap_lock); flush_dcache_mmap_lock(mapping); vma->vm_flags |= VM_NONLINEAR; |