Merge branch 'for-2.6.22' of git://git.kernel.dk/data/git/linux-2.6-b…

…lock

* 'for-2.6.22' of git://git.kernel.dk/data/git/linux-2.6-block:
  [PATCH] ll_rw_blk: fix missing bounce in blk_rq_map_kern()
  [PATCH] splice: always call into page_cache_readahead()
  [PATCH] splice(): fix interaction with readahead

block/ll_rw_blk.c

@@ -2558,6 +2558,7 @@ int blk_rq_map_kern(request_queue_t *q, struct request *rq, void *kbuf,
 		bio->bi_rw |= (1 << BIO_RW);
 
 	blk_rq_bio_prep(q, rq, bio);
+	blk_queue_bounce(q, &rq->bio);
 	rq->buffer = rq->data = NULL;
 	return 0;
 }

fs/splice.c

@@ -289,12 +289,10 @@ __generic_file_splice_read(struct file *in, loff_t *ppos,
 		nr_pages = PIPE_BUFFERS;
 
 	/*
-	 * Initiate read-ahead on this page range. however, don't call into
-	 * read-ahead if this is a non-zero offset (we are likely doing small
-	 * chunk splice and the page is already there) for a single page.
+	 * Don't try to 2nd guess the read-ahead logic, call into
+	 * page_cache_readahead() like the page cache reads would do.
 	 */
-	if (!loff || nr_pages > 1)
-		page_cache_readahead(mapping, &in->f_ra, in, index, nr_pages);
+	page_cache_readahead(mapping, &in->f_ra, in, index, nr_pages);
 
 	/*
 	 * Now fill in the holes:
@@ -378,10 +376,11 @@ __generic_file_splice_read(struct file *in, loff_t *ppos,
 			 * If in nonblock mode then dont block on waiting
 			 * for an in-flight io page
 			 */
-			if (flags & SPLICE_F_NONBLOCK)
-				break;
-
-			lock_page(page);
+			if (flags & SPLICE_F_NONBLOCK) {
+				if (TestSetPageLocked(page))
+					break;
+			} else
+				lock_page(page);
 
 			/*
 			 * page was truncated, stop here. if this isn't the