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Re: Xen VM call trace on fstrim: Error: discard_granularity is 0.
- To: Arthur Borsboom <arthurborsboom@xxxxxxxxx>
- From: Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Date: Mon, 18 Jan 2021 11:19:15 +0100
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On Wed, Jan 13, 2021 at 11:43:50AM +0100, Arthur Borsboom wrote:
> When performing the following command in a Xen VM the call trace below is
> generated.
>
> sudo fstrim -v /
>
> Xen VM host: Xen 4.14.0
> Xen Dom0: Linux 4.19.14
> Xen DomX: Linux 5.10.6
>
> The code in the kernel triggering this trace is the following.
>
> /* In case the discard granularity isn't set by buggy device driver
> */
> if (WARN_ON_ONCE(!q->limits.discard_granularity)) {
> char dev_name[BDEVNAME_SIZE];
>
> bdevname(bdev, dev_name);
> pr_err_ratelimited("%s: Error: discard_granularity is
> 0.\n", dev_name);
> return -EOPNOTSUPP;
> }
So it seems like the underlying storage in dom0 doesn't support
discard, and hence the feature don't get setup on the frontend?
Can you print the output of `xenstore-ls -fp` executed from dom0 when
the guest is running? That way I could see which features the backend
is exposing.
Thanks, Roger.
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