#define QCOW_CRYPT_AES 1
#define QCOW_MAX_CRYPT_CLUSTERS 32
+#define QCOW_MAX_SNAPSHOTS 65536
+
+/* 8 MB refcount table is enough for 2 PB images at 64k cluster size
+ * (128 GB for 512 byte clusters, 2 EB for 2 MB clusters) */
+#define QCOW_MAX_REFTABLE_SIZE 0x800000
+
+/* 32 MB L1 table is enough for 2 PB images at 64k cluster size
+ * (128 GB for 512 byte clusters, 2 EB for 2 MB clusters) */
+#define QCOW_MAX_L1_SIZE 0x2000000
+
+/* Allow for an average of 1k per snapshot table entry, should be plenty of
+ * space for snapshot names and IDs */
+#define QCOW_MAX_SNAPSHOTS_SIZE (1024 * QCOW_MAX_SNAPSHOTS)
/* indicate that the refcount of the referenced cluster is exactly one. */
#define QCOW_OFLAG_COPIED (1ULL << 63)
/* The cluster reads as all zeros */
#define QCOW_OFLAG_ZERO (1ULL << 0)
-#define REFCOUNT_SHIFT 1 /* refcount size is 2 bytes */
-
#define MIN_CLUSTER_BITS 9
#define MAX_CLUSTER_BITS 21
-#define L2_CACHE_SIZE 16
+#define MIN_L2_CACHE_SIZE 1 /* cluster */
/* Must be at least 4 to cover all cases of refcount table growth */
-#define REFCOUNT_CACHE_SIZE 4
+#define MIN_REFCOUNT_CACHE_SIZE 4 /* clusters */
+
+#define DEFAULT_L2_CACHE_BYTE_SIZE 1048576 /* bytes */
+
+/* The refblock cache needs only a fourth of the L2 cache size to cover as many
+ * clusters */
+#define DEFAULT_L2_REFCOUNT_SIZE_RATIO 4
#define DEFAULT_CLUSTER_SIZE 65536
#define QCOW2_OPT_DISCARD_REQUEST "pass-discard-request"
#define QCOW2_OPT_DISCARD_SNAPSHOT "pass-discard-snapshot"
#define QCOW2_OPT_DISCARD_OTHER "pass-discard-other"
+#define QCOW2_OPT_OVERLAP "overlap-check"
+#define QCOW2_OPT_OVERLAP_TEMPLATE "overlap-check.template"
+#define QCOW2_OPT_OVERLAP_MAIN_HEADER "overlap-check.main-header"
+#define QCOW2_OPT_OVERLAP_ACTIVE_L1 "overlap-check.active-l1"
+#define QCOW2_OPT_OVERLAP_ACTIVE_L2 "overlap-check.active-l2"
+#define QCOW2_OPT_OVERLAP_REFCOUNT_TABLE "overlap-check.refcount-table"
+#define QCOW2_OPT_OVERLAP_REFCOUNT_BLOCK "overlap-check.refcount-block"
+#define QCOW2_OPT_OVERLAP_SNAPSHOT_TABLE "overlap-check.snapshot-table"
+#define QCOW2_OPT_OVERLAP_INACTIVE_L1 "overlap-check.inactive-l1"
+#define QCOW2_OPT_OVERLAP_INACTIVE_L2 "overlap-check.inactive-l2"
+#define QCOW2_OPT_CACHE_SIZE "cache-size"
+#define QCOW2_OPT_L2_CACHE_SIZE "l2-cache-size"
+#define QCOW2_OPT_REFCOUNT_CACHE_SIZE "refcount-cache-size"
typedef struct QCowHeader {
uint32_t magic;
uint32_t refcount_order;
uint32_t header_length;
-} QCowHeader;
+} QEMU_PACKED QCowHeader;
+
+typedef struct QEMU_PACKED QCowSnapshotHeader {
+ /* header is 8 byte aligned */
+ uint64_t l1_table_offset;
+
+ uint32_t l1_size;
+ uint16_t id_str_size;
+ uint16_t name_size;
+
+ uint32_t date_sec;
+ uint32_t date_nsec;
+
+ uint64_t vm_clock_nsec;
+
+ uint32_t vm_state_size;
+ uint32_t extra_data_size; /* for extension */
+ /* extra data follows */
+ /* id_str follows */
+ /* name follows */
+} QCowSnapshotHeader;
+
+typedef struct QEMU_PACKED QCowSnapshotExtraData {
+ uint64_t vm_state_size_large;
+ uint64_t disk_size;
+} QCowSnapshotExtraData;
+
typedef struct QCowSnapshot {
uint64_t l1_table_offset;
int l2_size;
int l1_size;
int l1_vm_state_index;
+ int refcount_block_bits;
+ int refcount_block_size;
int csize_shift;
int csize_mask;
uint64_t cluster_offset_mask;
uint64_t *refcount_table;
uint64_t refcount_table_offset;
uint32_t refcount_table_size;
- int64_t free_cluster_index;
- int64_t free_byte_offset;
+ uint64_t free_cluster_index;
+ uint64_t free_byte_offset;
CoMutex lock;
AES_KEY aes_decrypt_key;
uint64_t snapshots_offset;
int snapshots_size;
- int nb_snapshots;
+ unsigned int nb_snapshots;
QCowSnapshot *snapshots;
int flags;
bool discard_passthrough[QCOW2_DISCARD_MAX];
+ int overlap_check; /* bitmask of Qcow2MetadataOverlap values */
+ bool signaled_corruption;
+
uint64_t incompatible_features;
uint64_t compatible_features;
uint64_t autoclear_features;
QCOW2_OL_INACTIVE_L2 = (1 << QCOW2_OL_INACTIVE_L2_BITNR),
} QCow2MetadataOverlap;
+/* Perform all overlap checks which can be done in constant time */
+#define QCOW2_OL_CONSTANT \
+ (QCOW2_OL_MAIN_HEADER | QCOW2_OL_ACTIVE_L1 | QCOW2_OL_REFCOUNT_TABLE | \
+ QCOW2_OL_SNAPSHOT_TABLE)
+
/* Perform all overlap checks which don't require disk access */
#define QCOW2_OL_CACHED \
- (QCOW2_OL_MAIN_HEADER | QCOW2_OL_ACTIVE_L1 | QCOW2_OL_ACTIVE_L2 | \
- QCOW2_OL_REFCOUNT_TABLE | QCOW2_OL_REFCOUNT_BLOCK | \
- QCOW2_OL_SNAPSHOT_TABLE | QCOW2_OL_INACTIVE_L1)
+ (QCOW2_OL_CONSTANT | QCOW2_OL_ACTIVE_L2 | QCOW2_OL_REFCOUNT_BLOCK | \
+ QCOW2_OL_INACTIVE_L1)
-/* The default checks to perform */
-#define QCOW2_OL_DEFAULT QCOW2_OL_CACHED
+/* Perform all overlap checks */
+#define QCOW2_OL_ALL \
+ (QCOW2_OL_CACHED | QCOW2_OL_INACTIVE_L2)
-#define L1E_OFFSET_MASK 0x00ffffffffffff00ULL
-#define L2E_OFFSET_MASK 0x00ffffffffffff00ULL
+#define L1E_OFFSET_MASK 0x00fffffffffffe00ULL
+#define L2E_OFFSET_MASK 0x00fffffffffffe00ULL
#define L2E_COMPRESSED_OFFSET_SIZE_MASK 0x3fffffffffffffffULL
-#define REFT_OFFSET_MASK 0xffffffffffffff00ULL
+#define REFT_OFFSET_MASK 0xfffffffffffffe00ULL
static inline int64_t start_of_cluster(BDRVQcowState *s, int64_t offset)
{
return (int64_t)s->l1_vm_state_index << (s->cluster_bits + s->l2_bits);
}
+static inline uint64_t qcow2_max_refcount_clusters(BDRVQcowState *s)
+{
+ return QCOW_MAX_REFTABLE_SIZE >> s->cluster_bits;
+}
+
static inline int qcow2_get_cluster_type(uint64_t l2_entry)
{
if (l2_entry & QCOW_OFLAG_COMPRESSED) {
int qcow2_mark_consistent(BlockDriverState *bs);
int qcow2_update_header(BlockDriverState *bs);
+void qcow2_signal_corruption(BlockDriverState *bs, bool fatal, int64_t offset,
+ int64_t size, const char *message_format, ...)
+ GCC_FMT_ATTR(5, 6);
+
/* qcow2-refcount.c functions */
int qcow2_refcount_init(BlockDriverState *bs);
void qcow2_refcount_close(BlockDriverState *bs);
+int qcow2_get_refcount(BlockDriverState *bs, int64_t cluster_index);
+
int qcow2_update_cluster_refcount(BlockDriverState *bs, int64_t cluster_index,
int addend, enum qcow2_discard_type type);
-int64_t qcow2_alloc_clusters(BlockDriverState *bs, int64_t size);
+int64_t qcow2_alloc_clusters(BlockDriverState *bs, uint64_t size);
int qcow2_alloc_clusters_at(BlockDriverState *bs, uint64_t offset,
int nb_clusters);
int64_t qcow2_alloc_bytes(BlockDriverState *bs, int size);
void qcow2_process_discards(BlockDriverState *bs, int ret);
-int qcow2_check_metadata_overlap(BlockDriverState *bs, int chk, int64_t offset,
+int qcow2_check_metadata_overlap(BlockDriverState *bs, int ign, int64_t offset,
int64_t size);
-int qcow2_pre_write_overlap_check(BlockDriverState *bs, int chk, int64_t offset,
+int qcow2_pre_write_overlap_check(BlockDriverState *bs, int ign, int64_t offset,
int64_t size);
/* qcow2-cluster.c functions */
int qcow2_get_cluster_offset(BlockDriverState *bs, uint64_t offset,
int *num, uint64_t *cluster_offset);
int qcow2_alloc_cluster_offset(BlockDriverState *bs, uint64_t offset,
- int n_start, int n_end, int *num, uint64_t *host_offset, QCowL2Meta **m);
+ int *num, uint64_t *host_offset, QCowL2Meta **m);
uint64_t qcow2_alloc_compressed_cluster_offset(BlockDriverState *bs,
uint64_t offset,
int compressed_size);
int qcow2_alloc_cluster_link_l2(BlockDriverState *bs, QCowL2Meta *m);
int qcow2_discard_clusters(BlockDriverState *bs, uint64_t offset,
- int nb_sectors, enum qcow2_discard_type type);
+ int nb_sectors, enum qcow2_discard_type type, bool full_discard);
int qcow2_zero_clusters(BlockDriverState *bs, uint64_t offset, int nb_sectors);
-int qcow2_expand_zero_clusters(BlockDriverState *bs);
+int qcow2_expand_zero_clusters(BlockDriverState *bs,
+ BlockDriverAmendStatusCB *status_cb);
/* qcow2-snapshot.c functions */
int qcow2_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info);
const char *name,
Error **errp);
int qcow2_snapshot_list(BlockDriverState *bs, QEMUSnapshotInfo **psn_tab);
-int qcow2_snapshot_load_tmp(BlockDriverState *bs, const char *snapshot_name);
+int qcow2_snapshot_load_tmp(BlockDriverState *bs,
+ const char *snapshot_id,
+ const char *name,
+ Error **errp);
void qcow2_free_snapshots(BlockDriverState *bs);
int qcow2_read_snapshots(BlockDriverState *bs);
projects / mirror_qemu.git / blobdiff