fix check for md raid imsm signature on 4k devices

On devices with 4k logical block size, the imsm signature
is located 8k from the end of the device, not 1k as is
the case for devices with 512 LBS.

diff --git a/lib/device/dev-md.c b/lib/device/dev-md.c
index 36494b12b383c93366a2724381f6bc4bae7642d3..3049b81b726f94cc876676d9e5d749654b006e89 100644 (file)
--- a/lib/device/dev-md.c
+++ b/lib/device/dev-md.c
@@ -56,6 +56,16 @@ static int _dev_has_imsm_magic(struct device *dev, uint64_t devsize_sectors)
 {
        char imsm_signature[IMSM_SIG_LEN];
        uint64_t off = (devsize_sectors * 512) - 1024;
+       unsigned int physical_block_size = 0;
+       unsigned int logical_block_size = 0;
+
+       if (!dev_get_direct_block_sizes(dev, &physical_block_size, &logical_block_size))
+               return_0;
+
+       if (logical_block_size == 4096)
+               off = (devsize_sectors * 512) - 8192;
+       else
+               off = (devsize_sectors * 512) - 1024;
 
        if (!dev_read_bytes(dev, off, IMSM_SIG_LEN, imsm_signature))
                return_0;