DriveSetup is not able to create and format partitions

[Premislaus]

This is Jessicah EFI build, x86_64, updated via pkgman to hrev50876. Haiku is running from pendrive, in "Boot to desktop" mode (Live CD). I tried to create additional BFS and Windows Data (Fat32?) partition, on this flash stick, for some files.

1. DriveSetup creates partition with only 984 KiB of space instead 13 GiB.
2. When I try to format that partition, KDL occurs.

I cannot reproduce on a regular night building, because I am unable to boot - https://dev.haiku-os.org/ticket/13200

[jessicah]

Well, the KDL is likely due to trying to format a strange partition. The partition creation itself is interesting though, as the GPT structures on disk think it has a maximum size of 1GB, which doesn't match what DriveSetup is showing. Obviously, the partition validation code is shrinking the partition to the maximum size the current GPT headers indicate, resulting in the tiny partition.

Indeed, we have in syslog "KERN: last usable block: 2047966", multiply this by sector size of 512 gives us 1GB. This would require DriveSetup identifying that the GPT is on a larger disk, relocating the backup headers and changing the pointers to end of the disk to match that of the actual disk size. I'm not sure how feasible this would be to achieve, but definitely an interesting case to look into.