[DragonFlyBSD - Submit #3276] Add option controlling whether gpt expand expands the last partition (needs testing)

[sigttou]

Issue #3276 has been updated by sigttou.


gpt expand relocates the backup GPT but leaves the usable LBA range
(hdr_lba_end) at the old size, so the expanded partition ends past
last_usable_lba.  6.4-RELEASE's stock gpt does the same.

Filed with a fix as #3423.

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Submit #3276: Add option controlling whether gpt expand expands the last partition (needs testing)
http://bugs.dragonflybsd.org/issues/3276#change-14701

* Author: falsifian
* Status: New
* Priority: Normal
* Target version: 6.4
* Start date: 2021-05-26
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Just today I needed a version of the "gpt expand" command that doesn't extend the last partition. The attached patch adds a -x option; the last partition is only expanded if -x is specified.

I have done minimal testing:

- I successfully used it without -x after copying my laptop's data to a larger SSD, leaving plenty of space at the end for me to install DragonflyBSD on top of the two existing OSs :-)

- I did a really quick test with the -x option on a hastily created vnode disk initialized with gpt init. I just verified that after expanding with -x, the Dfly partition got bigger.

I'm happy to do more testing if requested, though I'm not sure exactly what to try.

(This patch changes the default behaviour. I suppose it could be reversed, but a "don't expand the last partition option" seems a bit more convoluted conceptually.)

Patch is vs. commit 42a874b478.

---Files--------------------------------
expand.patch (6.65 KB)
gpt-expand-n-master.patch (2.1 KB)
gpt-expand-x.v2.patch (4.72 KB)


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