Re: report a bug that panic when grow size for external bitmap

[NeilBrown <neilb@suse.com>]

[-- Attachment #1: Type: text/plain, Size: 1027 bytes --]

On Wed, Aug 30 2017, Zhilong Liu wrote:

> On 08/29/2017 06:47 PM, NeilBrown wrote:

>> Thanks.  I see what I missed. Please try this patch instead.
>
> Hi, Neil;
>      I have tested the following patch, I still got the call-trace after 
> I built with it.
> If you need other infos, I would append.


Thanks for testing.
I looked more completely and I think it is easiest just to disable the
functionality rather than try to fix it.
Resizing the file in the kernel is extra complexity that I don't
want to get in to.
We could adjust the bitmap chunk size so that the file doesn't
need to grow, but it started getting more complicated than I really
wanted to deal with.
If there is anyone actually using file-backed bitmaps who wants to
be able to resize the array without removing the bitmap first, then
we can look at the problem again.  For now I've sent a patch which
just returns an error instead of crashing when someone tries to resize
an array with a file-backed bitmap.

Thanks,
NeilBrown

[-- Attachment #2: signature.asc --]
[-- Type: application/pgp-signature, Size: 832 bytes --]