diff options
Diffstat (limited to 'mm/filemap.c')
| -rw-r--r-- | mm/filemap.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/mm/filemap.c b/mm/filemap.c index 8ed709a83eb..33f81252a74 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -612,6 +612,19 @@ void __lock_page_nosync(struct page *page) TASK_UNINTERRUPTIBLE); } +int __lock_page_or_retry(struct page *page, struct mm_struct *mm, + unsigned int flags) +{ + if (!(flags & FAULT_FLAG_ALLOW_RETRY)) { + __lock_page(page); + return 1; + } else { + up_read(&mm->mmap_sem); + wait_on_page_locked(page); + return 0; + } +} + /** * find_get_page - find and get a page reference * @mapping: the address_space to search @@ -1550,7 +1563,8 @@ retry_find: goto no_cached_page; } - lock_page(page); + if (!lock_page_or_retry(page, vma->vm_mm, vmf->flags)) + return ret | VM_FAULT_RETRY; /* Did it get truncated? */ if (unlikely(page->mapping != mapping)) { |