With Sun partitions, individual partitions can start at disk
address zero. That's right, zero.
This works because UFS and EXT{2,3,4} superblocks are offset
far enough into the partition that it won't overwrite the
disk label nor the boot block.
I added an, arguably hackish, heuristic to handle this properly.
Basically if the OS device name does not end in a digit we'll believe
that a zero hdg.start value can be a partition.
If anyone has a better way to handle this, let me know :-)
2009-04-19 David S. Miller <da...@davemloft.net>
* util/hostdisk.c (device_is_wholedisk): New function.
(grub_util_biosdisk_get_grub_dev): Shortcut when hdg.start is
zero only if device_is_wholedisk() returns true.
---
util/hostdisk.c | 12 +++++++++++-
1 files changed, 11 insertions(+), 1 deletions(-)
diff --git a/util/hostdisk.c b/util/hostdisk.c
index aa41703..b55d7fe 100644
--- a/util/hostdisk.c
+++ b/util/hostdisk.c
@@ -827,6 +827,16 @@ convert_system_partition_to_system_disk (const char
*os_dev)
}
static int
+device_is_wholedisk (const char *os_dev)
+{
+ int len = strlen (os_dev);
+
+ if (os_dev[len - 1] < '0' || os_dev[len - 1] > '9')
+ return 1;
+ return 0;
+}
+
+static int
find_system_device (const char *os_dev)
{
int i;
@@ -961,7 +971,7 @@ grub_util_biosdisk_get_grub_dev (const char *os_dev)
grub_util_info ("%s starts from %lu", os_dev, hdg.start);
- if (hdg.start == 0)
+ if (hdg.start == 0 && device_is_wholedisk (os_dev))
return name;
grub_util_info ("opening the device %s", name);
--
1.6.2.3
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