Re: [PATCH] stat: don't fail if the major number is >= 256

[Linus Torvalds]

On Mon, Apr 11, 2022 at 7:41 PM Christoph Hellwig <hch@xxxxxxxxxxxxx> wrote:
>
> And that is easily fixed by using a lower major for the block dynamic
> dev_t.  In theory userspace should be able to copy with any major for
> it, but I fear something might break so we could make it configurable.

We actually have a ton of major numbers free, although it's not
obvious because of the whole "they are used by character devices, not
block devices" issue.

Ie 4-6, 12, 14, 19 are all free, afaik.

But yeah, somebody might have a static /dev for some odd embedded case, I guess.

That said, it really does look like we just return -EOVERFLOW much too
eagerly, for stupid and bad reasons.

Considering that BLOCK_EXT_MAJOR has been 259 since 2008, and this is
the first time anybody has hit this, I don't think there's much reason
to change that major number when the whole error case seems to have
been largely a mistake to begin with.

                  Linus