sfdisk: don't use BLKRRPART to check loopdev usage

It seesm that kernel always returns EINVAL for BLKRRPART on loop
devices, we call the ioctl to check if nobody else uses the device.

Signed-off-by: Karel Zak <kzak@redhat.com>

diff --git a/disk-utils/sfdisk.c b/disk-utils/sfdisk.c
index f34a45adc6cc9ab900f82991feaf2ea8ab14e679..67fa1d18f3c914e32dc40a9da8aeb2109d63a15e 100644 (file)
--- a/disk-utils/sfdisk.c
+++ b/disk-utils/sfdisk.c
@@ -44,6 +44,7 @@
 #include "blkdev.h"
 #include "all-io.h"
 #include "rpmatch.h"
+#include "loopdev.h"
 
 #include "libfdisk.h"
 #include "fdisk-list.h"
@@ -1083,7 +1084,8 @@ static int is_device_used(struct sfdisk *sf)
        if (fd < 0)
                return 0;
 
-       if (fstat(fd, &st) == 0 && S_ISBLK(st.st_mode))
+       if (fstat(fd, &st) == 0 && S_ISBLK(st.st_mode)
+           && major(st.st_rdev) != LOOPDEV_MAJOR)
                return ioctl(fd, BLKRRPART) != 0;
 #endif
        return 0;