Re: [Qemu-devel] [PATCH 3/5] block: added check image option and callback bdrv_is_opened_unclean

[Fam Zheng <famz@redhat.com>]

On Wed, 12/23 10:46, Denis V. Lunev wrote:
> From: Olga Krishtal <okrishtal@virtuozzo.com>
> 
> If image is opened for writing and it was not closed correctly
> (the image is dirty) we have to check and repair it. By default
> the option is off.
> 
> bdrv_is_opened_unclean - cheks if the image is dirty
> This callbsck will be used to ensure that image was
> closed correctly, and if not - to check and repair it.
> 
> Signed-off-by: Olga Krishtal <okrishtal@virtuozzo.com>
> Signed-off-by: Denis V. Lunev <den@openvz.org>
> CC: Kevin Wolf <kwolf@redhat.com>
> CC: Max Reitz <mreitz@redhat.com>
> CC: Eric Blake <eblake@redhat.com>
> CC: Fam Zheng <famz@redhat.com>
> ---
>  block.c                   | 32 ++++++++++++++++++++++++++++++++
>  include/block/block.h     |  1 +
>  include/block/block_int.h |  1 +
>  3 files changed, 34 insertions(+)
> 
> diff --git a/block.c b/block.c
> index 74228b8..1f704f5 100644
> --- a/block.c
> +++ b/block.c
> @@ -903,6 +903,12 @@ static QemuOptsList bdrv_runtime_opts = {
>              .help = "How to lock the image: none or lockfile",
>              .def_value_str = "none",
>          },
> +        {
> +            .name = "check",
> +            .type = QEMU_OPT_BOOL,
> +            .help = "Check and repair the image if it is unclean",
> +            .def_value_str = "off",
> +        },
>          { /* end of list */ }
>      },
>  };
> @@ -1042,6 +1048,16 @@ static int bdrv_open_common(BlockDriverState *bs, BdrvChild *file,
>          }
>      }
>  
> +    if (!bs->read_only && qemu_opt_get_bool_del(opts, "check", true) &&
> +                bdrv_is_opened_unclean(bs) && !(flags | BDRV_O_CHECK)) {
> +        BdrvCheckResult result = {0};
> +        ret = bdrv_check(bs, &result, BDRV_FIX_ERRORS);
> +        if (ret < 0) {
> +            error_setg_errno(errp, -ret, "Could not repair dirty image");
> +            bdrv_close(bs);
> +            goto fail_opts;
> +        }
> +    }
>      if (bs->encrypted) {
>          error_report("Encrypted images are deprecated");
>          error_printf("Support for them will be removed in a future release.\n"
> @@ -4361,3 +4377,19 @@ int bdrv_lock_image(BlockDriverState *bs, BdrvLockImage lock)
>      }
>      return -EOPNOTSUPP;
>  }
> +
> +bool bdrv_is_opened_unclean(BlockDriverState *bs)
> +{
> +    BlockDriver *drv = bs->drv;
> +    if (drv != NULL && drv->bdrv_is_opened_unclean != NULL) {
> +        return drv->bdrv_is_opened_unclean(bs);
> +    }
> +    if (bs->file == NULL) {
> +        return false;
> +    }
> +    drv = bs->file->bs->drv;
> +    if (drv != NULL && drv->bdrv_is_opened_unclean != NULL) {
> +        return drv->bdrv_is_opened_unclean;

Should this be

           return drv->bdrv_is_opened_unclean(bs);

?

(well, I may be wrong in saying this doesn't compile :)

Fam

> +    }
> +    return false;
> +}
> diff --git a/include/block/block.h b/include/block/block.h
> index 27fc434..c366990 100644
> --- a/include/block/block.h
> +++ b/include/block/block.h
> @@ -507,6 +507,7 @@ void bdrv_dirty_iter_init(BdrvDirtyBitmap *bitmap, struct HBitmapIter *hbi);
>  void bdrv_set_dirty_iter(struct HBitmapIter *hbi, int64_t offset);
>  int64_t bdrv_get_dirty_count(BdrvDirtyBitmap *bitmap);
>  int bdrv_lock_image(BlockDriverState *bs, BdrvLockImage lock);
> +bool bdrv_is_opened_unclean(BlockDriverState *bs);
>  
>  void bdrv_enable_copy_on_read(BlockDriverState *bs);
>  void bdrv_disable_copy_on_read(BlockDriverState *bs);
> diff --git a/include/block/block_int.h b/include/block/block_int.h
> index 755f342..fc3f4a6 100644
> --- a/include/block/block_int.h
> +++ b/include/block/block_int.h
> @@ -137,6 +137,7 @@ struct BlockDriver {
>      int (*bdrv_make_empty)(BlockDriverState *bs);
>      int (*bdrv_lock_image)(BlockDriverState *bs, BdrvLockImage lock);
>  
> +    bool (*bdrv_is_opened_unclean)(BlockDriverState *bs);
>      void (*bdrv_refresh_filename)(BlockDriverState *bs, QDict *options);
>  
>      /* aio */
> -- 
> 2.1.4
>