linux: also detect "in-use" dmraid and scsi-Nth (N>=16) partitions

Prior to this change, Parted would fail to detect any in-use
partition on a dmraid disk, as well as any in-use partition
numbered 16 or greater on a regular scsi disk.
This was because assumptions were being made about the device node
major/minor numbers and how they relate to the partition number.
These assumptions are invalid for dmraid devices, and for normal
disks with >= 16 partitions.
* libparted/arch/linux.c (_partition_get_part_dev): Remove function.
(_partition_is_mounted): Rewrite to use _partition_is_mounted_by_path
instead of _by_dev.

1 files changed, 10 insertions, 20 deletions

diff --git a/libparted/arch/linux.c b/libparted/arch/linux.c
index c108f5a..b56ce2b 100644
--- a/libparted/arch/linux.c
+++ b/libparted/arch/linux.c
@@ -2238,19 +2238,6 @@ linux_partition_get_path (const PedPartition* part)
         return _device_get_part_path (part->disk->dev, part->num);
 }
 
-static dev_t
-_partition_get_part_dev (const PedPartition* part)
-{
-        struct stat dev_stat;
-        int dev_major, dev_minor;
-
-        if (stat (part->disk->dev->path, &dev_stat))
-                return (dev_t)0;
-        dev_major = major (dev_stat.st_rdev);
-        dev_minor = minor (dev_stat.st_rdev);
-        return (dev_t)makedev (dev_major, dev_minor + part->num);
-}
-
 static int
 _mount_table_search (const char* file_name, dev_t dev)
 {
@@ -2294,16 +2281,19 @@ _partition_is_mounted_by_path (const char *path)
         return _partition_is_mounted_by_dev (part_stat.st_rdev);
 }
 
+/* If partition PART is mounted, or if we encounter an out-of-memory error
+   while trying to determine its status, return 1.  Otherwise, return 0.  */
 static int
 _partition_is_mounted (const PedPartition *part)
 {
-        dev_t dev;
-        if (!ped_partition_is_active (part))
-                return 0;
-        dev = _partition_get_part_dev (part);
-        if (!dev)
-                return 0;
-        return _partition_is_mounted_by_dev (dev);
+	if (!ped_partition_is_active (part))
+		return 0;
+	char *part_name = _device_get_part_path (part->disk->dev, part->num);
+	if (!part_name)
+		return 1;
+	int status = _partition_is_mounted_by_path (part_name);
+	free (part_name);
+	return !!status;
 }
 
 static int