block: temporarily disable discard granularity

Commit 86b37281411cf1e9bc0a6b5406c45edb7bd9ea5d adds a check for
misaligned stacking offsets, but it's buggy since the defaults are 0.
Hence all dm devices that pass in a non-zero starting offset will
be marked as misaligned amd dm will complain.

A real fix is coming, in the mean time disable the discard granularity
check so that users don't worry about dm reporting about misaligned
devices.

Signed-off-by: Jens Axboe <jens.axboe@oracle.com>

1 files changed, 7 insertions, 0 deletions

diff --git a/block/blk-settings.c b/block/blk-settings.c
index dd1f1e0e196..6ae118d6e19 100644
--- a/block/blk-settings.c
+++ b/block/blk-settings.c
@@ -554,11 +554,18 @@ int blk_stack_limits(struct queue_limits *t, struct queue_limits *b,
                 ret = -1;
         }
 
+        /*
+         * Temporarily disable discard granularity. It's currently buggy
+         * since we default to 0 for discard_granularity, hence this
+         * "failure" will always trigger for non-zero offsets.
+         */
+#if 0
         if (offset &&
             (offset & (b->discard_granularity - 1)) != b->discard_alignment) {
                 t->discard_misaligned = 1;
                 ret = -1;
         }
+#endif
 
         /* If top has no alignment offset, inherit from bottom */
         if (!t->alignment_offset)