#248 Creating file system detroys sun disklabel

[Jim Gifford]

No matter how I configure the /dev/sdb, after i format
the disk the sun disklabel is gone. Here is the steps I
used to create and verify the issue. Note: This does
not happen with ext2/ext3 file systems.

First - I create the disk label, doing this on a
secondary drive. This is Sparc system.

SCSI device sdb: drive cache: write through w/ FUA
sdb: sdb1 sdb2 sdb3

Second - Format /dev/sdb1 with jfs

mkfs.jfs version 1.1.11, 05-Jun-2006
Warning! All data on device /dev/sdb1 will be lost!

Continue? (Y/N) Y
\

Format completed successfully.

17635328 kilobytes total disk space.

Third re-run fdisk to verify disklabel

Device contains neither a valid DOS partition table,
nor Sun, SGI or OSF disklabel
Building a new sun disklabel. Changes will remain in
memory only,
until you decide to write them. After that, of course,
the previous
content won't be recoverable.

[Jim Gifford]

Logged In: YES
user_id=492775

I workaround for this issue is to start the partition on
block 1 instead of block 0.

mkfs.jfs /dev/sdb1
mkfs.jfs version 1.1.11, 05-Jun-2006
Warning! All data on device /dev/sdb1 will be lost!

Continue? (Y/N) y
\

Format completed successfully.
17685504 kilobytes total disk space.

# fdisk /dev/sdb

Command (m for help): p

Disk /dev/sdb (Sun disk label): 64 heads, 32 sectors, 17272
cylinders
Units = cylinders of 2048 * 512 bytes

Device Flag Start End Blocks Id System
/dev/sdb1 1 17272 17685504 83 Linux native
/dev/sdb3 0 17272 17686528 5 Whole disk

Command (m for help): x

[David Kleikamp]

Logged In: YES
user_id=422440

Sorry I let this go so long. Can you try the attached
patch? I "borrowed" some code from xfsprogs.

[David Kleikamp]

Don't zero the reserved space at the beginning of a partition if we can recognize it as a partition label