[PATCH 0/6] GPT: fixes around last_usable_lba
Sascha Hauer
s.hauer at pengutronix.de
Wed Jul 1 02:27:33 PDT 2026
The last_usable_lba field in a GPT specifies just that: The last LBA we
are allowed to use for partitions. There are some bugs around that fixed
in this series:
- When creating partitions we never actually check against
last_usable_lba, but instead the device end.
- When writing a disk image to a device the last_usable_lba is usually
set to some value matching the image size. When writing the partition
table later, adjust the value for the actual device size so that the
full device becomes usable
Also some logging fixes/cleanups included
Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
---
Sascha Hauer (6):
partitions: gpt: Adjust last_usable_lba to real device size when writing
partitions: gpt: refresh also when primary or alternate is invalid
partitions: gpt: validate mkpart range against GPT usable LBAs
partitions: check new partitions against usable LBAs, not device size
partitions: gpt: fix wrong error messages
partitions: gpt: log a message when partition table refreshed
commands/parted.c | 8 +-------
common/partitions.c | 28 +++++++++++++++++++-------
common/partitions/efi.c | 53 +++++++++++++++++++++++++++++++++++--------------
include/partitions.h | 2 ++
4 files changed, 62 insertions(+), 29 deletions(-)
---
base-commit: 18599acfcbf38e95edc605f89e257e32f67d0ac4
change-id: 20260701-gpt-size-fixes-fa23624e09b0
Best regards,
--
Sascha Hauer <s.hauer at pengutronix.de>
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