block: remove per-queue plugging

Code has been converted over to the new explicit on-stack plugging,
and delay users have been converted to use the new API for that.
So lets kill off the old plugging along with aops->sync_page().

Signed-off-by: Jens Axboe <jaxboe@fusionio.com>

1 files changed, 0 insertions, 12 deletions

diff --git a/mm/readahead.c b/mm/readahead.c
index 77506a291a2d..cbddc3e17246 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -554,17 +554,5 @@ 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);