Merge branch 'for-linus' of git://git.kernel.dk/data/git/linux-2.6-block

* 'for-linus' of git://git.kernel.dk/data/git/linux-2.6-block:
  Export __splice_from_pipe()
  2/2 splice: dont readpage
  1/2 splice: dont steal
  make elv_register() output atomic
  block: blk_max_pfn is somtimes wrong

block/elevator.c

@@ -964,17 +964,18 @@ void elv_unregister_queue(struct request_queue *q)
 
 int elv_register(struct elevator_type *e)
 {
+	char *def = "";
 	spin_lock_irq(&elv_list_lock);
 	BUG_ON(elevator_find(e->elevator_name));
 	list_add_tail(&e->list, &elv_list);
 	spin_unlock_irq(&elv_list_lock);
 
-	printk(KERN_INFO "io scheduler %s registered", e->elevator_name);
 	if (!strcmp(e->elevator_name, chosen_elevator) ||
 			(!*chosen_elevator &&
 			 !strcmp(e->elevator_name, CONFIG_DEFAULT_IOSCHED)))
-				printk(" (default)");
-	printk("\n");
+				def = " (default)";
+
+	printk(KERN_INFO "io scheduler %s registered%s\n", e->elevator_name, def);
 	return 0;
 }
 EXPORT_SYMBOL_GPL(elv_register);

block/ll_rw_blk.c

@@ -1221,7 +1221,7 @@ void blk_recount_segments(request_queue_t *q, struct bio *bio)
 		 * considered part of another segment, since that might
 		 * change with the bounce page.
 		 */
-		high = page_to_pfn(bv->bv_page) >= q->bounce_pfn;
+		high = page_to_pfn(bv->bv_page) > q->bounce_pfn;
 		if (high || highprv)
 			goto new_hw_segment;
 		if (cluster) {
@@ -3658,8 +3658,8 @@ int __init blk_dev_init(void)
 	open_softirq(BLOCK_SOFTIRQ, blk_done_softirq, NULL);
 	register_hotcpu_notifier(&blk_cpu_notifier);
 
-	blk_max_low_pfn = max_low_pfn;
-	blk_max_pfn = max_pfn;
+	blk_max_low_pfn = max_low_pfn - 1;
+	blk_max_pfn = max_pfn - 1;
 
 	return 0;
 }

fs/splice.c

@@ -576,30 +576,6 @@ static int pipe_to_file(struct pipe_inode_info *pipe, struct pipe_buffer *buf,
 	if (this_len + offset > PAGE_CACHE_SIZE)
 		this_len = PAGE_CACHE_SIZE - offset;
 
-	/*
-	 * Reuse buf page, if SPLICE_F_MOVE is set and we are doing a full
-	 * page.
-	 */
-	if ((sd->flags & SPLICE_F_MOVE) && this_len == PAGE_CACHE_SIZE) {
-		/*
-		 * If steal succeeds, buf->page is now pruned from the
-		 * pagecache and we can reuse it. The page will also be
-		 * locked on successful return.
-		 */
-		if (buf->ops->steal(pipe, buf))
-			goto find_page;
-
-		page = buf->page;
-		if (add_to_page_cache(page, mapping, index, GFP_KERNEL)) {
-			unlock_page(page);
-			goto find_page;
-		}
-
-		page_cache_get(page);
-
-		if (!(buf->flags & PIPE_BUF_FLAG_LRU))
-			lru_cache_add(page);
-	} else {
 find_page:
 	page = find_lock_page(mapping, index);
 	if (!page) {
@@ -617,37 +593,6 @@ static int pipe_to_file(struct pipe_inode_info *pipe, struct pipe_buffer *buf,
 			goto out;
 	}
 
-		/*
-		 * We get here with the page locked. If the page is also
-		 * uptodate, we don't need to do more. If it isn't, we
-		 * may need to bring it in if we are not going to overwrite
-		 * the full page.
-		 */
-		if (!PageUptodate(page)) {
-			if (this_len < PAGE_CACHE_SIZE) {
-				ret = mapping->a_ops->readpage(file, page);
-				if (unlikely(ret))
-					goto out;
-
-				lock_page(page);
-
-				if (!PageUptodate(page)) {
-					/*
-					 * Page got invalidated, repeat.
-					 */
-					if (!page->mapping) {
-						unlock_page(page);
-						page_cache_release(page);
-						goto find_page;
-					}
-					ret = -EIO;
-					goto out;
-				}
-			} else
-				SetPageUptodate(page);
-		}
-	}
-
 	ret = mapping->a_ops->prepare_write(file, page, offset, offset+this_len);
 	if (unlikely(ret)) {
 		loff_t isize = i_size_read(mapping->host);
@@ -706,7 +651,7 @@ static int pipe_to_file(struct pipe_inode_info *pipe, struct pipe_buffer *buf,
  * key here is the 'actor' worker passed in that actually moves the data
  * to the wanted destination. See pipe_to_file/pipe_to_sendpage above.
  */
-static ssize_t __splice_from_pipe(struct pipe_inode_info *pipe,
+ssize_t __splice_from_pipe(struct pipe_inode_info *pipe,
 			   struct file *out, loff_t *ppos, size_t len,
 			   unsigned int flags, splice_actor *actor)
 {
@@ -802,6 +747,7 @@ static ssize_t __splice_from_pipe(struct pipe_inode_info *pipe,
 
 	return ret;
 }
+EXPORT_SYMBOL(__splice_from_pipe);
 
 ssize_t splice_from_pipe(struct pipe_inode_info *pipe, struct file *out,
 			 loff_t *ppos, size_t len, unsigned int flags,

include/linux/pipe_fs_i.h

@@ -99,4 +99,8 @@ extern ssize_t splice_from_pipe(struct pipe_inode_info *, struct file *,
 				loff_t *, size_t, unsigned int,
 				splice_actor *);
 
+extern ssize_t __splice_from_pipe(struct pipe_inode_info *, struct file *,
+				  loff_t *, size_t, unsigned int,
+				  splice_actor *);
+
 #endif

mm/bounce.c

@@ -204,7 +204,7 @@ static void __blk_queue_bounce(request_queue_t *q, struct bio **bio_orig,
 		/*
 		 * is destination page below bounce pfn?
 		 */
-		if (page_to_pfn(page) < q->bounce_pfn)
+		if (page_to_pfn(page) <= q->bounce_pfn)
 			continue;
 
 		/*