diff options
| -rw-r--r-- | mm/readahead.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/mm/readahead.c b/mm/readahead.c index 86d54f5b38e5..b59f8f4c57bc 100644 --- a/mm/readahead.c +++ b/mm/readahead.c @@ -117,25 +117,27 @@ void do_page_cache_readahead(struct file *file, /* * Preallocate as many pages as we will need. */ + read_lock(&mapping->page_lock); for (page_idx = 0; page_idx < nr_to_read; page_idx++) { unsigned long page_offset = offset + page_idx; if (page_offset > end_index) break; - read_lock(&mapping->page_lock); page = radix_tree_lookup(&mapping->page_tree, page_offset); - read_unlock(&mapping->page_lock); if (page) continue; + read_unlock(&mapping->page_lock); page = page_cache_alloc(mapping); + read_lock(&mapping->page_lock); if (!page) break; page->index = page_offset; list_add(&page->list, &page_pool); nr_to_really_read++; } + read_unlock(&mapping->page_lock); /* * Now start the IO. We ignore I/O errors - if the page is not |