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-rw-r--r--mm/readahead.c18
1 files changed, 6 insertions, 12 deletions
diff --git a/mm/readahead.c b/mm/readahead.c
index 77506a291a2..2c0cc489e28 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -109,9 +109,12 @@ EXPORT_SYMBOL(read_cache_pages);
static int read_pages(struct address_space *mapping, struct file *filp,
struct list_head *pages, unsigned nr_pages)
{
+ struct blk_plug plug;
unsigned page_idx;
int ret;
+ blk_start_plug(&plug);
+
if (mapping->a_ops->readpages) {
ret = mapping->a_ops->readpages(filp, mapping, pages, nr_pages);
/* Clean up the remaining pages */
@@ -129,7 +132,10 @@ static int read_pages(struct address_space *mapping, struct file *filp,
page_cache_release(page);
}
ret = 0;
+
out:
+ blk_finish_plug(&plug);
+
return ret;
}
@@ -554,17 +560,5 @@ page_cache_async_readahead(struct address_space *mapping,
/* do read-ahead */
ondemand_readahead(mapping, ra, filp, true, offset, req_size);
-
-#ifdef CONFIG_BLOCK
- /*
- * Normally the current page is !uptodate and lock_page() will be
- * immediately called to implicitly unplug the device. However this
- * is not always true for RAID conifgurations, where data arrives
- * not strictly in their submission order. In this case we need to
- * explicitly kick off the IO.
- */
- if (PageUptodate(page))
- blk_run_backing_dev(mapping->backing_dev_info, NULL);
-#endif
}
EXPORT_SYMBOL_GPL(page_cache_async_readahead);