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 <andrey.shinkev...@virtuozzo.com> --- 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: 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 refcount bits: 16 dirty bitmaps: [0]: flags: [0]: in-use [1]: auto name: {257b5ea5-38c5-410e-a457-71c76f763c60} granularity: 65536 [1]: flags: [0]: in-use [1]: auto name: back-up granularity: 65536 corrupt: false block/qcow2-bitmap.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++ block/qcow2.c | 10 ++++++++++ block/qcow2.h | 2 ++ qapi/block-core.json | 35 ++++++++++++++++++++++++++++++++++- 4 files changed, 96 insertions(+), 1 deletion(-) diff --git a/block/qcow2-bitmap.c b/block/qcow2-bitmap.c index accebef..dcc53db 100644 --- a/block/qcow2-bitmap.c +++ b/block/qcow2-bitmap.c @@ -1008,6 +1008,56 @@ fail: return false; } +static Qcow2BitmapInfoFlagsList *get_bitmap_info_flags(uint32_t flags) +{ + Qcow2BitmapInfoFlagsList *list = NULL; + Qcow2BitmapInfoFlagsList **plist = &list; + + if (flags & BME_FLAG_IN_USE) { + Qcow2BitmapInfoFlagsList *entry = g_new0(Qcow2BitmapInfoFlagsList, 1); + entry->value = QCOW2_BITMAP_INFO_FLAGS_IN_USE; + *plist = entry; + plist = &entry->next; + } + if (flags & BME_FLAG_AUTO) { + Qcow2BitmapInfoFlagsList *entry = g_new0(Qcow2BitmapInfoFlagsList, 1); + entry->value = QCOW2_BITMAP_INFO_FLAGS_AUTO; + *plist = entry; + } + return list; +} + +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; + + 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); + 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..6485f79 100644 --- 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, }; } 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 +## +{ '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 +# +# Since: 3.2 +## +{ 'struct': 'Qcow2BitmapInfo', + 'data': {'name': 'str', 'granularity': 'uint32', + 'flags': ['Qcow2BitmapInfoFlags']} } + +## # @BlockLatencyHistogramInfo: # # Block latency histogram. -- 1.8.3.1