06.12.2018 16:19, Andrey Shinkevich wrote:
> The 'Format specific information' of qemu-img info command will show
> the name, flags and granularity for every QCOW2 bitmap as follows:
>
> image: /vz/vmprivate/VM1/harddisk.hdd
> file format: qcow2
> virtual size: 64G (68719476736 bytes)
> disk size: 3.0M
> cluster_size: 1048576
> Format specific information:
> compat: 1.1
> lazy refcounts: true
> bitmaps:
> [0]:
> flags:
> [0]: in-use
> [1]: auto
> name: back-up1
> unknown flags: 4
> granularity: 65536
> [1]:
> flags:
> [0]: in-use
> [1]: auto
> name: back-up2
> unknown flags: 8
> granularity: 65536
> refcount bits: 16
> corrupt: false
>
> Signed-off-by: Andrey Shinkevich <andrey.shinkev...@virtuozzo.com>
> ---
> v3:
> Now, qcow2_get_bitmap_info_list() is invoked under the condition of QCOW
> version #3 to avoid memory leaks in case of QCOW version #2.
> Furthermore, qcow2_get_bitmap_info_list() checks the number of existing
> bitmaps.
> So, if no bitmap exists, no bitmap error message is printed in the output.
> The data type of the bitmap 'granularity' parameter was left as 'uint32'
> because bitmap_list_load() returns error if granularity_bits is grater than
> 31.
>
Ok, uint32 works for me too.
[...]
> +
> +Qcow2BitmapInfoList *qcow2_get_bitmap_info_list(BlockDriverState *bs,
> + Error **errp)
> +{
> + BDRVQcow2State *s = bs->opaque;
> + Qcow2BitmapList *bm_list;
> + Qcow2Bitmap *bm;
> + Qcow2BitmapInfoList *list = NULL;
> + Qcow2BitmapInfoList **plist = &list;
> +
> + if (s->nb_bitmaps == 0) {
> + return NULL;
> + }
> +
> + bm_list = bitmap_list_load(bs, s->bitmap_directory_offset,
> + s->bitmap_directory_size, errp);
> + if (bm_list == NULL) {
> + return NULL;
> + }
> +
> + QSIMPLEQ_FOREACH(bm, bm_list, entry) {
> + Qcow2BitmapInfo *info = g_new0(Qcow2BitmapInfo, 1);
> + Qcow2BitmapInfoList *obj = g_new0(Qcow2BitmapInfoList, 1);
> + info->granularity = 1U << bm->granularity_bits;
> + info->name = g_strdup(bm->name);
> + info->flags = get_bitmap_info_flags(bm->flags);
> + info->unknown_flags = bm->flags & ~(BME_FLAG_IN_USE | BME_FLAG_AUTO);
we should use bm->flags & BME_RESERVED_FLAGS instead
> + info->has_unknown_flags = !!info->unknown_flags;
> + obj->value = info;
> + *plist = obj;
> + plist = &obj->next;
> + }
> +
> + bitmap_list_free(bm_list);
> +
> + return list;
> +}
> +
> int qcow2_reopen_bitmaps_rw_hint(BlockDriverState *bs, bool *header_updated,
> Error **errp)
> {
> diff --git a/block/qcow2.c b/block/qcow2.c
> index 991d6ac..a023856 100644
> --- a/block/qcow2.c
> +++ b/block/qcow2.c
> @@ -4254,6 +4254,8 @@ 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;
>
> if (s->crypto != NULL) {
> encrypt_info = qcrypto_block_get_info(s->crypto, &error_abort);
> @@ -4270,6 +4272,10 @@ static ImageInfoSpecific
> *qcow2_get_specific_info(BlockDriverState *bs)
> .refcount_bits = s->refcount_bits,
> };
> } else if (s->qcow_version == 3) {
both local_err and bitmaps variables are used only here.
I'd like at least bitmaps to be defined here too.
> + bitmaps = qcow2_get_bitmap_info_list(bs, &local_err);
> + if (local_err != NULL) {
> + error_report_err(local_err);
> + }
> *spec_info->u.qcow2.data = (ImageInfoSpecificQCow2){
> .compat = g_strdup("1.1"),
> .lazy_refcounts = s->compatible_features &
> @@ -4279,6 +4285,8 @@ static ImageInfoSpecific
> *qcow2_get_specific_info(BlockDriverState *bs)
> QCOW2_INCOMPAT_CORRUPT,
> .has_corrupt = true,
> .refcount_bits = s->refcount_bits,
> + .has_bitmaps = !!bitmaps,
> + .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 d4fe710..55d7056 100644
> --- a/qapi/block-core.json
> +++ b/qapi/block-core.json
[...]
> ##
> +# @Qcow2BitmapInfoFlags:
> +#
> +# An enumeration of states that a bitmap can report to the user.
may be, s/states/flags/ is closer to what it is.
> +#
> +# @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: 4.0
> +##
with at least BME_RESERVED_FLAGS used (and, if you want, other small things):
Reviewed-by: Vladimir Sementsov-Ogievskiy <vsement...@virtuozzo.com>
--
Best regards,
Vladimir
