Merge branch 'akpm' (patches from Andrew)

Merge updates from Andrew Morton:

 - various misc bits

 - most of MM (quite a lot of MM material is awaiting the merge of
   linux-next dependencies)

 - kasan

 - printk updates

 - procfs updates

 - MAINTAINERS

 - /lib updates

 - checkpatch updates

* emailed patches from Andrew Morton <akpm@linux-foundation.org>: (123 commits)
  init: reduce rootwait polling interval time to 5ms
  binfmt_elf: use vmalloc() for allocation of vma_filesz
  checkpatch: don't emit unified-diff error for rename-only patches
  checkpatch: don't check c99 types like uint8_t under tools
  checkpatch: avoid multiple line dereferences
  checkpatch: don't check .pl files, improve absolute path commit log test
  scripts/checkpatch.pl: fix spelling
  checkpatch: don't try to get maintained status when --no-tree is given
  lib/ida: document locking requirements a bit better
  lib/rbtree.c: fix typo in comment of ____rb_erase_color
  lib/Kconfig.debug: make CONFIG_STRICT_DEVMEM depend on CONFIG_DEVMEM
  MAINTAINERS: add drm and drm/i915 irc channels
  MAINTAINERS: add "C:" for URI for chat where developers hang out
  MAINTAINERS: add drm and drm/i915 bug filing info
  MAINTAINERS: add "B:" for URI where to file bugs
  get_maintainer: look for arbitrary letter prefixes in sections
  printk: add Kconfig option to set default console loglevel
  printk/sound: handle more message headers
  printk/btrfs: handle more message headers
  printk/kdb: handle more message headers
  ...

1 files changed, 28 insertions, 11 deletions

diff --git a/mm/readahead.c b/mm/readahead.c
index c8a955b1297e..c4ca70239233 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -207,12 +207,21 @@ out:
  * memory at once.
  */
 int force_page_cache_readahead(struct address_space *mapping, struct file *filp,
-		pgoff_t offset, unsigned long nr_to_read)
+			       pgoff_t offset, unsigned long nr_to_read)
 {
+	struct backing_dev_info *bdi = inode_to_bdi(mapping->host);
+	struct file_ra_state *ra = &filp->f_ra;
+	unsigned long max_pages;
+
 	if (unlikely(!mapping->a_ops->readpage && !mapping->a_ops->readpages))
 		return -EINVAL;
 
-	nr_to_read = min(nr_to_read, inode_to_bdi(mapping->host)->ra_pages);
+	/*
+	 * If the request exceeds the readahead window, allow the read to
+	 * be up to the optimal hardware IO size
+	 */
+	max_pages = max_t(unsigned long, bdi->io_pages, ra->ra_pages);
+	nr_to_read = min(nr_to_read, max_pages);
 	while (nr_to_read) {
 		int err;
 
@@ -369,10 +378,18 @@ ondemand_readahead(struct address_space *mapping,
 		   bool hit_readahead_marker, pgoff_t offset,
 		   unsigned long req_size)
 {
-	unsigned long max = ra->ra_pages;
+	struct backing_dev_info *bdi = inode_to_bdi(mapping->host);
+	unsigned long max_pages = ra->ra_pages;
 	pgoff_t prev_offset;
 
 	/*
+	 * If the request exceeds the readahead window, allow the read to
+	 * be up to the optimal hardware IO size
+	 */
+	if (req_size > max_pages && bdi->io_pages > max_pages)
+		max_pages = min(req_size, bdi->io_pages);
+
+	/*
 	 * start of file
 	 */
 	if (!offset)
@@ -385,7 +402,7 @@ ondemand_readahead(struct address_space *mapping,
 	if ((offset == (ra->start + ra->size - ra->async_size) ||
 	     offset == (ra->start + ra->size))) {
 		ra->start += ra->size;
-		ra->size = get_next_ra_size(ra, max);
+		ra->size = get_next_ra_size(ra, max_pages);
 		ra->async_size = ra->size;
 		goto readit;
 	}
@@ -400,16 +417,16 @@ ondemand_readahead(struct address_space *mapping,
 		pgoff_t start;
 
 		rcu_read_lock();
-		start = page_cache_next_hole(mapping, offset + 1, max);
+		start = page_cache_next_hole(mapping, offset + 1, max_pages);
 		rcu_read_unlock();
 
-		if (!start || start - offset > max)
+		if (!start || start - offset > max_pages)
 			return 0;
 
 		ra->start = start;
 		ra->size = start - offset;	/* old async_size */
 		ra->size += req_size;
-		ra->size = get_next_ra_size(ra, max);
+		ra->size = get_next_ra_size(ra, max_pages);
 		ra->async_size = ra->size;
 		goto readit;
 	}
@@ -417,7 +434,7 @@ ondemand_readahead(struct address_space *mapping,
 	/*
 	 * oversize read
 	 */
-	if (req_size > max)
+	if (req_size > max_pages)
 		goto initial_readahead;
 
 	/*
@@ -433,7 +450,7 @@ ondemand_readahead(struct address_space *mapping,
 	 * Query the page cache and look for the traces(cached history pages)
 	 * that a sequential stream would leave behind.
 	 */
-	if (try_context_readahead(mapping, ra, offset, req_size, max))
+	if (try_context_readahead(mapping, ra, offset, req_size, max_pages))
 		goto readit;
 
 	/*
@@ -444,7 +461,7 @@ ondemand_readahead(struct address_space *mapping,
 
 initial_readahead:
 	ra->start = offset;
-	ra->size = get_init_ra_size(req_size, max);
+	ra->size = get_init_ra_size(req_size, max_pages);
 	ra->async_size = ra->size > req_size ? ra->size - req_size : ra->size;
 
 readit:
@@ -454,7 +471,7 @@ readit:
 	 * the resulted next readahead window into the current one.
 	 */
 	if (offset == ra->start && ra->size == ra->async_size) {
-		ra->async_size = get_next_ra_size(ra, max);
+		ra->async_size = get_next_ra_size(ra, max_pages);
 		ra->size += ra->async_size;
 	}