[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-block] [PATCH] qemu-img info lists bitmap directory entries
From: |
Vladimir Sementsov-Ogievskiy |
Subject: |
Re: [Qemu-block] [PATCH] qemu-img info lists bitmap directory entries |
Date: |
Tue, 27 Nov 2018 13:12:54 +0000 |
27.11.2018 15:41, Andrey Shinkevich wrote:
> The 'Format specific information' of qemu-img info command will show
> the name, flags and granularity for every QCOW2 bitmap.
>
> Signed-off-by: Andrey Shinkevich <address@hidden>
> ---
> Dear colleagues,
>
> With this patch, qemu-img info will display a name, flags and granularity
> information for every bitmap in the directory section of a QCOW2 image.
> That information appears in the 'Format specific information' section as
> it's shown in the following example:
>
[...]
> --- a/block/qcow2.c
> +++ b/block/qcow2.c
> @@ -4254,6 +4254,13 @@ static ImageInfoSpecific
> *qcow2_get_specific_info(BlockDriverState *bs)
> BDRVQcow2State *s = bs->opaque;
> ImageInfoSpecific *spec_info;
> QCryptoBlockInfo *encrypt_info = NULL;
> + Error *local_err = NULL;
> + Qcow2BitmapInfoList *bitmaps;
> +
> + bitmaps = qcow2_get_bitmap_info_list(bs, &local_err);
> + if (local_err != NULL) {
> + error_report_err(local_err);
> + }
>
> if (s->crypto != NULL) {
> encrypt_info = qcrypto_block_get_info(s->crypto, &error_abort);
> @@ -4268,6 +4275,7 @@ static ImageInfoSpecific
> *qcow2_get_specific_info(BlockDriverState *bs)
> *spec_info->u.qcow2.data = (ImageInfoSpecificQCow2){
> .compat = g_strdup("0.10"),
> .refcount_bits = s->refcount_bits,
> + .bitmaps = bitmaps,
Bitmaps are possible only in version >=3, so this line should be dropped
> };
> } else if (s->qcow_version == 3) {
> *spec_info->u.qcow2.data = (ImageInfoSpecificQCow2){
> @@ -4279,6 +4287,8 @@ static ImageInfoSpecific
> *qcow2_get_specific_info(BlockDriverState *bs)
> QCOW2_INCOMPAT_CORRUPT,
> .has_corrupt = true,
> .refcount_bits = s->refcount_bits,
> + .has_bitmaps = bitmaps ? true : false,
> + .bitmaps = bitmaps,
> };
> } else {
> /* if this assertion fails, this probably means a new version was
> diff --git a/block/qcow2.h b/block/qcow2.h
> index 8662b68..0ec2b3d 100644
> --- a/block/qcow2.h
> +++ b/block/qcow2.h
> @@ -685,6 +685,8 @@ int qcow2_check_bitmaps_refcounts(BlockDriverState *bs,
> BdrvCheckResult *res,
> void **refcount_table,
> int64_t *refcount_table_size);
> bool qcow2_load_dirty_bitmaps(BlockDriverState *bs, Error **errp);
> +Qcow2BitmapInfoList *qcow2_get_bitmap_info_list(BlockDriverState *bs,
> + Error **errp);
> int qcow2_reopen_bitmaps_rw_hint(BlockDriverState *bs, bool *header_updated,
> Error **errp);
> int qcow2_reopen_bitmaps_rw(BlockDriverState *bs, Error **errp);
> diff --git a/qapi/block-core.json b/qapi/block-core.json
> index f4538fa..e021ead 100644
> --- a/qapi/block-core.json
> +++ b/qapi/block-core.json
> @@ -77,7 +77,8 @@
> '*lazy-refcounts': 'bool',
> '*corrupt': 'bool',
> 'refcount-bits': 'int',
> - '*encrypt': 'ImageInfoSpecificQCow2Encryption'
> + '*encrypt': 'ImageInfoSpecificQCow2Encryption',
> + '*bitmaps': ['Qcow2BitmapInfo']
> } }
>
> ##
> @@ -454,6 +455,38 @@
> 'status': 'DirtyBitmapStatus'} }
>
> ##
> +# @Qcow2BitmapInfoFlags:
> +#
> +# An enumeration of states that a bitmap can report to the user.
> +#
> +# @in-use: The bitmap was not saved correctly and may be inconsistent.
> +#
> +# @auto: The bitmap must reflect all changes of the virtual disk by any
> +# application that would write to this qcow2 file.
> +#
> +# Since: 3.2
Hm, I heard, the next is 4.0?
> +##
> +{ 'enum': 'Qcow2BitmapInfoFlags',
> + 'data': ['in-use', 'auto'] }
> +
> +##
> +# @Qcow2BitmapInfo:
> +#
> +# Image bitmap information.
> +#
> +# @name: the name of the dirty bitmap
> +#
> +# @granularity: granularity of the dirty bitmap in bytes
> +#
> +# @flags: flags of the dirty bitmap
drop "dirty" word, they are just bitmaps by spec.
> +#
> +# Since: 3.2
and here, 4.0?
> +##
> +{ 'struct': 'Qcow2BitmapInfo',
> + 'data': {'name': 'str', 'granularity': 'uint32',
> + 'flags': ['Qcow2BitmapInfoFlags']} }
> +
> +##
> # @BlockLatencyHistogramInfo:
> #
> # Block latency histogram.
>
with these small fixes:
Reviewed-by: Vladimir Sementsov-Ogievskiy <address@hidden>
--
Best regards,
Vladimir