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Re: [Qemu-devel] [PATCH 2/2] sheepdog: improve error handling for a case
From: |
Liu Yuan |
Subject: |
Re: [Qemu-devel] [PATCH 2/2] sheepdog: improve error handling for a case of failed lock |
Date: |
Fri, 8 Aug 2014 13:31:39 +0800 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Thu, Aug 07, 2014 at 04:28:40PM +0900, Hitoshi Mitake wrote:
> Recently, sheepdog revived its VDI locking functionality. This patch
> updates sheepdog driver of QEMU for this feature:
>
> 1. Improve error message when QEMU fails to acquire lock of
> VDI. Current sheepdog driver prints an error message "VDI isn't
> locked" when it fails to acquire lock. It is a little bit confusing
> because the mesage says VDI isn't locked but it is actually locked by
> other VM. This patch modifies this confusing message.
>
> 2. Change error code for a case of failed locking. -EBUSY is a
> suitable one.
>
> Reported-by: Valerio Pachera <address@hidden>
> Cc: Kevin Wolf <address@hidden>
> Cc: Stefan Hajnoczi <address@hidden>
> Cc: Liu Yuan <address@hidden>
> Cc: MORITA Kazutaka <address@hidden>
> Signed-off-by: Hitoshi Mitake <address@hidden>
> ---
> block/sheepdog.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/block/sheepdog.c b/block/sheepdog.c
> index 36f76f0..0b3f86d 100644
> --- a/block/sheepdog.c
> +++ b/block/sheepdog.c
> @@ -1112,9 +1112,13 @@ static int find_vdi_name(BDRVSheepdogState *s, const
> char *filename,
>
> if (rsp->result != SD_RES_SUCCESS) {
> error_setg(errp, "cannot get vdi info, %s, %s %" PRIu32 " %s",
> + rsp->result == SD_RES_VDI_NOT_LOCKED ?
I'm puzzled by this check.
we use SD_RES_VDI_LOCKED to indicate vid is already locked, no?
> + "VDI is already locked by other VM" :
> sd_strerror(rsp->result), filename, snapid, tag);
> if (rsp->result == SD_RES_NO_VDI) {
> ret = -ENOENT;
> + } else if (rsp->result == SD_RES_VDI_NOT_LOCKED) {
> + ret = -EBUSY;
> } else {
> ret = -EIO;
> }
It is better to use switch case to handle the result.
Thanks
Yuan
[Qemu-devel] [PATCH 2/2] sheepdog: improve error handling for a case of failed lock, Hitoshi Mitake, 2014/08/07
- Re: [Qemu-devel] [PATCH 2/2] sheepdog: improve error handling for a case of failed lock,
Liu Yuan <=