[RFC 2/4] blkdev: lift BLK_MAX_BLOCK_SIZE to page cache limit

[Luis Chamberlain <mcgrof@kernel.org>]

It's a brave new world. This is now part of the validation to get
to at least the page cache limit.

Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
---
 include/linux/blkdev.h | 7 ++-----
 1 file changed, 2 insertions(+), 5 deletions(-)

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 1c0cf6af392c..9e1b3e7526d9 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -26,6 +26,7 @@
 #include <linux/xarray.h>
 #include <linux/file.h>
 #include <linux/lockdep.h>
+#include <linux/pagemap.h>
 
 struct module;
 struct request_queue;
@@ -268,11 +269,7 @@ static inline dev_t disk_devt(struct gendisk *disk)
 	return MKDEV(disk->major, disk->first_minor);
 }
 
-/*
- * We should strive for 1 << (PAGE_SHIFT + MAX_PAGECACHE_ORDER)
- * however we constrain this to what we can validate and test.
- */
-#define BLK_MAX_BLOCK_SIZE      SZ_64K
+#define BLK_MAX_BLOCK_SIZE      1 << (PAGE_SHIFT + MAX_PAGECACHE_ORDER)
 
 /* blk_validate_limits() validates bsize, so drivers don't usually need to */
 static inline int blk_validate_block_size(unsigned long bsize)
-- 
2.47.2