block: make large sector size support configurable
Make it so we can turn off LBS support because it's not that stable.
Signed-off-by: "Darrick J. Wong" <djwong@kernel.org>
diff --git a/block/Kconfig b/block/Kconfig
index df8973b..5efcf12 100644
--- a/block/Kconfig
+++ b/block/Kconfig
@@ -36,6 +36,12 @@
created on demand, but scripts that manually create device nodes and
then call losetup might rely on this behavior.
+config BLOCK_LBS
+ bool "Large sector size support"
+ default n
+ help
+ Enable sector sizes larger than the base page size.
+
config BLK_RQ_ALLOC_TIME
bool
diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index 9a1f0ee..1820220 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -272,7 +272,11 @@ static inline dev_t disk_devt(struct gendisk *disk)
* 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
+#ifdef CONFIG_BLOCK_LBS
+# define BLK_MAX_BLOCK_SIZE SZ_64K
+#else
+# define BLK_MAX_BLOCK_SIZE PAGE_SIZE
+#endif
/* blk_validate_limits() validates bsize, so drivers don't usually need to */
static inline int blk_validate_block_size(unsigned long bsize)
