File device-if-BLKPBSZGET-is-unavailable-try-to-use-BLKSS.patch of Package lvm2.1005

From 3fbf50379b5d29aab1a560d98cd0e23449bc91c6 Mon Sep 17 00:00:00 2001
From: Liuhua Wang <lwang@suse.com>
Date: Mon, 2 Nov 2015 14:04:52 +0800
Subject: [PATCH] device: if BLKPBSZGET is unavailable, try to use BLKSSZGET
 with fallback to 512b

Upstream-commit: f270bbd442b3c36115ea490ec838cf29277a46d2
---
 lib/device/dev-io.c | 23 +++++++++++++++++------
 1 file changed, 17 insertions(+), 6 deletions(-)

diff --git a/lib/device/dev-io.c b/lib/device/dev-io.c
index d15f7a8..5cc5a61 100644
--- a/lib/device/dev-io.c
+++ b/lib/device/dev-io.c
@@ -156,13 +156,24 @@ int dev_get_block_size(struct device *dev, unsigned int *physical_block_size, un
        }
        log_debug("%s: physical block size is %u bytes", name, dev->phys_block_size);
    }
-#else
+#elif BLKSSZGET
    /* if we can't get physical block size, just use logical block size instead */
-    // FIXME block_size is typically 4096b while phys_block_size is 512b
-    dev->phys_block_size = 512;// dev->block_size;
-
-   log_debug("%s: physical block size can't be determined, using logical "
-              "block size of %u bytes instead", name, dev->phys_block_size);
+   if (dev->phys_block_size == -1) {
+       if (ioctl(dev_fd(dev), BLKSSZGET, &dev->phys_block_size) < 0) {
+           log_sys_error("ioctl BLKSSZGET", name);
+           r = 0;
+           goto out;
+       }
+       log_debug("%s: physical block size can't be determined, using logical "
+                  "block size of %u bytes", name, dev->phys_block_size);
+   }         
+#else
+   /* if even BLKSSZGET is not available, use default 512b */
+   if (dev->phys_block_size == -1) {
+       dev->phys_block_size = 512;
+       log_debug("%s: physical block size can't be determined, using block "
+                  "size of %u bytes instead", name, dev->phys_block_size);
+   }  
 #endif
 
    *physical_block_size = (unsigned int) dev->phys_block_size;
-- 
1.8.4.5