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| author | Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com> | 2017-06-28 15:05:08 +0300 |
|---|---|---|
| committer | Max Reitz <mreitz@redhat.com> | 2017-07-11 17:44:57 +0200 |
| commit | 88ddffae8fc1e30cc907c2dbb989b7eba9e62319 (patch) | |
| tree | 312f7ceab9b279ca0d04c7ad31d9f8b25c74e058 /block/qcow2.h | |
| parent | 8a5bb1f114c5959cf6b247a737394afb0c518b40 (diff) | |
| download | qemu-88ddffae8fc1e30cc907c2dbb989b7eba9e62319.tar.gz | |
qcow2: add bitmaps extension
Add bitmap extension as specified in docs/specs/qcow2.txt.
For now, just mirror extension header into Qcow2 state and check
constraints. Also, calculate refcounts for qcow2 bitmaps, to not break
qemu-img check.
For now, disable image resize if it has bitmaps. It will be fixed later.
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Message-id: 20170628120530.31251-9-vsementsov@virtuozzo.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
Diffstat (limited to 'block/qcow2.h')
| -rw-r--r-- | block/qcow2.h | 27 |
1 files changed, 27 insertions, 0 deletions
diff --git a/block/qcow2.h b/block/qcow2.h index a272a39ab2..348864860b 100644 --- a/block/qcow2.h +++ b/block/qcow2.h @@ -53,6 +53,10 @@ * space for snapshot names and IDs */ #define QCOW_MAX_SNAPSHOTS_SIZE (1024 * QCOW_MAX_SNAPSHOTS) +/* Bitmap header extension constraints */ +#define QCOW2_MAX_BITMAPS 65535 +#define QCOW2_MAX_BITMAP_DIRECTORY_SIZE (1024 * QCOW2_MAX_BITMAPS) + /* indicate that the refcount of the referenced cluster is exactly one. */ #define QCOW_OFLAG_COPIED (1ULL << 63) /* indicate that the cluster is compressed (they never have the copied flag) */ @@ -201,6 +205,14 @@ enum { QCOW2_COMPAT_FEAT_MASK = QCOW2_COMPAT_LAZY_REFCOUNTS, }; +/* Autoclear feature bits */ +enum { + QCOW2_AUTOCLEAR_BITMAPS_BITNR = 0, + QCOW2_AUTOCLEAR_BITMAPS = 1 << QCOW2_AUTOCLEAR_BITMAPS_BITNR, + + QCOW2_AUTOCLEAR_MASK = QCOW2_AUTOCLEAR_BITMAPS, +}; + enum qcow2_discard_type { QCOW2_DISCARD_NEVER = 0, QCOW2_DISCARD_ALWAYS, @@ -228,6 +240,13 @@ typedef uint64_t Qcow2GetRefcountFunc(const void *refcount_array, typedef void Qcow2SetRefcountFunc(void *refcount_array, uint64_t index, uint64_t value); +typedef struct Qcow2BitmapHeaderExt { + uint32_t nb_bitmaps; + uint32_t reserved32; + uint64_t bitmap_directory_size; + uint64_t bitmap_directory_offset; +} QEMU_PACKED Qcow2BitmapHeaderExt; + typedef struct BDRVQcow2State { int cluster_bits; int cluster_size; @@ -274,6 +293,10 @@ typedef struct BDRVQcow2State { unsigned int nb_snapshots; QCowSnapshot *snapshots; + uint32_t nb_bitmaps; + uint64_t bitmap_directory_size; + uint64_t bitmap_directory_offset; + int flags; int qcow_version; bool use_lazy_refcounts; @@ -618,4 +641,8 @@ int qcow2_cache_get_empty(BlockDriverState *bs, Qcow2Cache *c, uint64_t offset, void **table); void qcow2_cache_put(BlockDriverState *bs, Qcow2Cache *c, void **table); +/* qcow2-bitmap.c functions */ +int qcow2_check_bitmaps_refcounts(BlockDriverState *bs, BdrvCheckResult *res, + void **refcount_table, + int64_t *refcount_table_size); #endif |