Re: [PATCH v3 14/15] hw/block/nvme: Use zone metadata file for persistence

[Klaus Jensen]

On Sep 14 07:14, Dmitry Fomichev wrote:
> A ZNS drive that is emulated by this module is currently initialized
> with all zones Empty upon startup. However, actual ZNS SSDs save the
> state and condition of all zones in their internal NVRAM in the event
> of power loss. When such a drive is powered up again, it closes or
> finishes all zones that were open at the moment of shutdown. Besides
> that, the write pointer position as well as the state and condition
> of all zones is preserved across power-downs.
> 
> This commit adds the capability to have a persistent zone metadata
> to the device. The new optional module property, "zone_file",
> is introduced. If added to the command line, this property specifies
> the name of the file that stores the zone metadata. If "zone_file" is
> omitted, the device will be initialized with all zones empty, the same
> as before.
> 
> If zone metadata is configured to be persistent, then zone descriptor
> extensions also persist across controller shutdowns.
> 
> Signed-off-by: Dmitry Fomichev <dmitry.fomichev@wdc.com>

This doesn't build on mingw.

> ---
>  hw/block/nvme.c | 370 +++++++++++++++++++++++++++++++++++++++++++++---
>  hw/block/nvme.h |  37 +++++
>  2 files changed, 386 insertions(+), 21 deletions(-)
> 
> diff --git a/hw/block/nvme.c b/hw/block/nvme.c
> index b49ae83dd5..41f4c0dacd 100644
> --- a/hw/block/nvme.c
> +++ b/hw/block/nvme.c
> @@ -3429,7 +3557,188 @@ static int nvme_init_zone_meta(NvmeCtrl *n, 
> NvmeNamespace *ns,
>      return 0;
>  }
>  
> -static void nvme_zoned_init_ctrl(NvmeCtrl *n, Error **errp)
> +static int nvme_open_zone_file(NvmeCtrl *n, bool *init_meta)
> +{
> +    struct stat statbuf;
> +    size_t fsize;
> +    int ret;
> +
> +    ret = stat(n->params.zone_file, &statbuf);
> +    if (ret && errno == ENOENT) {
> +        *init_meta = true;
> +    } else if (!S_ISREG(statbuf.st_mode)) {
> +        fprintf(stderr, "%s is not a regular file\n", strerror(errno));
> +        return -1;
> +    }
> +
> +    n->zone_file_fd = open(n->params.zone_file,
> +                           O_RDWR | O_LARGEFILE | O_BINARY | O_CREAT, 644);

mode is wrong - I think you meant for it to be octal.

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