Merge git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-2.6-dm

* git://git.kernel.org/pub/scm/linux/kernel/git/agk/linux-2.6-dm:
  dm kcopyd: return client directly and not through a pointer
  dm kcopyd: reserve fewer pages
  dm io: use fixed initial mempool size
  dm kcopyd: alloc pages from the main page allocator
  dm kcopyd: add gfp parm to alloc_pl
  dm kcopyd: remove superfluous page allocation spinlock
  dm kcopyd: preallocate sub jobs to avoid deadlock
  dm kcopyd: avoid pointless job splitting
  dm mpath: do not fail paths after integrity errors
  dm table: reject devices without request fns
  dm table: allow targets to support discards internally

drivers/md/dm-io.c

@@ -19,6 +19,8 @@
 #define DM_MSG_PREFIX "io"
 
 #define DM_IO_MAX_REGIONS	BITS_PER_LONG
+#define MIN_IOS		16
+#define MIN_BIOS	16
 
 struct dm_io_client {
 	mempool_t *pool;
@@ -40,34 +42,22 @@ struct io {
 
 static struct kmem_cache *_dm_io_cache;
 
-/*
- * io contexts are only dynamically allocated for asynchronous
- * io.  Since async io is likely to be the majority of io we'll
- * have the same number of io contexts as bios! (FIXME: must reduce this).
- */
-
-static unsigned int pages_to_ios(unsigned int pages)
-{
-	return 4 * pages;	/* too many ? */
-}
-
 /*
  * Create a client with mempool and bioset.
  */
-struct dm_io_client *dm_io_client_create(unsigned num_pages)
+struct dm_io_client *dm_io_client_create(void)
 {
-	unsigned ios = pages_to_ios(num_pages);
 	struct dm_io_client *client;
 
 	client = kmalloc(sizeof(*client), GFP_KERNEL);
 	if (!client)
 		return ERR_PTR(-ENOMEM);
 
-	client->pool = mempool_create_slab_pool(ios, _dm_io_cache);
+	client->pool = mempool_create_slab_pool(MIN_IOS, _dm_io_cache);
 	if (!client->pool)
 		goto bad;
 
-	client->bios = bioset_create(16, 0);
+	client->bios = bioset_create(MIN_BIOS, 0);
 	if (!client->bios)
 		goto bad;
 
@@ -81,13 +71,6 @@ struct dm_io_client *dm_io_client_create(unsigned num_pages)
 }
 EXPORT_SYMBOL(dm_io_client_create);
 
-int dm_io_client_resize(unsigned num_pages, struct dm_io_client *client)
-{
-	return mempool_resize(client->pool, pages_to_ios(num_pages),
-			      GFP_KERNEL);
-}
-EXPORT_SYMBOL(dm_io_client_resize);
-
 void dm_io_client_destroy(struct dm_io_client *client)
 {
 	mempool_destroy(client->pool);