#define BLOCK_QCOW2_H
#include "aes.h"
+#include "qemu-coroutine.h"
+
+//#define DEBUG_ALLOC
+//#define DEBUG_ALLOC2
+//#define DEBUG_EXT
#define QCOW_MAGIC (('Q' << 24) | ('F' << 16) | ('I' << 8) | 0xfb)
#define QCOW_VERSION 2
#define REFCOUNT_SHIFT 1 /* refcount size is 2 bytes */
#define MIN_CLUSTER_BITS 9
-#define MAX_CLUSTER_BITS 16
+#define MAX_CLUSTER_BITS 21
#define L2_CACHE_SIZE 16
+/* Must be at least 4 to cover all cases of refcount table growth */
+#define REFCOUNT_CACHE_SIZE 4
+
+#define DEFAULT_CLUSTER_SIZE 65536
+
typedef struct QCowHeader {
uint32_t magic;
uint32_t version;
uint64_t vm_clock_nsec;
} QCowSnapshot;
+struct Qcow2Cache;
+typedef struct Qcow2Cache Qcow2Cache;
+
typedef struct BDRVQcowState {
- BlockDriverState *hd;
int cluster_bits;
int cluster_size;
int cluster_sectors;
uint64_t cluster_offset_mask;
uint64_t l1_table_offset;
uint64_t *l1_table;
- uint64_t *l2_cache;
- uint64_t l2_cache_offsets[L2_CACHE_SIZE];
- uint32_t l2_cache_counts[L2_CACHE_SIZE];
+
+ Qcow2Cache* l2_table_cache;
+ Qcow2Cache* refcount_block_cache;
+
uint8_t *cluster_cache;
uint8_t *cluster_data;
uint64_t cluster_cache_offset;
+ QLIST_HEAD(QCowClusterAlloc, QCowL2Meta) cluster_allocs;
uint64_t *refcount_table;
uint64_t refcount_table_offset;
uint32_t refcount_table_size;
- uint64_t refcount_block_cache_offset;
- uint16_t *refcount_block_cache;
int64_t free_cluster_index;
int64_t free_byte_offset;
+ CoMutex lock;
+
uint32_t crypt_method; /* current crypt method, 0 if no key yet */
uint32_t crypt_method_header;
AES_KEY aes_encrypt_key;
int64_t refcount_block_offset;
} QCowCreateState;
-static int size_to_clusters(BDRVQcowState *s, int64_t size)
+struct QCowAIOCB;
+
+/* XXX This could be private for qcow2-cluster.c */
+typedef struct QCowL2Meta
+{
+ uint64_t offset;
+ uint64_t cluster_offset;
+ int n_start;
+ int nb_available;
+ int nb_clusters;
+ struct QCowL2Meta *depends_on;
+ CoQueue dependent_requests;
+
+ QLIST_ENTRY(QCowL2Meta) next_in_flight;
+} QCowL2Meta;
+
+static inline int size_to_clusters(BDRVQcowState *s, int64_t size)
{
return (size + (s->cluster_size - 1)) >> s->cluster_bits;
}
-// FIXME Need qcow2_ prefix to global functions
+static inline int size_to_l1(BDRVQcowState *s, int64_t size)
+{
+ int shift = s->cluster_bits + s->l2_bits;
+ return (size + (1ULL << shift) - 1) >> shift;
+}
-/* qcow2.c functions */
-void l2_cache_reset(BlockDriverState *bs);
+static inline int64_t align_offset(int64_t offset, int n)
+{
+ offset = (offset + n - 1) & ~(n - 1);
+ return offset;
+}
-/* qcow2-refcount.c functions */
-int refcount_init(BlockDriverState *bs);
-void refcount_close(BlockDriverState *bs);
-int64_t alloc_clusters(BlockDriverState *bs, int64_t size);
-int64_t alloc_bytes(BlockDriverState *bs, int size);
-void free_clusters(BlockDriverState *bs,
- int64_t offset, int64_t size);
+// FIXME Need qcow2_ prefix to global functions
-void create_refcount_update(QCowCreateState *s, int64_t offset, int64_t size);
-int update_snapshot_refcount(BlockDriverState *bs,
- int64_t l1_table_offset,
- int l1_size,
- int addend);
+/* qcow2.c functions */
+int qcow2_backing_read1(BlockDriverState *bs, QEMUIOVector *qiov,
+ int64_t sector_num, int nb_sectors);
-int check_refcounts(BlockDriverState *bs);
+/* qcow2-refcount.c functions */
+int qcow2_refcount_init(BlockDriverState *bs);
+void qcow2_refcount_close(BlockDriverState *bs);
+
+int64_t qcow2_alloc_clusters(BlockDriverState *bs, int64_t size);
+int64_t qcow2_alloc_bytes(BlockDriverState *bs, int size);
+void qcow2_free_clusters(BlockDriverState *bs,
+ int64_t offset, int64_t size);
+void qcow2_free_any_clusters(BlockDriverState *bs,
+ uint64_t cluster_offset, int nb_clusters);
+
+int qcow2_update_snapshot_refcount(BlockDriverState *bs,
+ int64_t l1_table_offset, int l1_size, int addend);
+
+int qcow2_check_refcounts(BlockDriverState *bs, BdrvCheckResult *res);
+
+/* qcow2-cluster.c functions */
+int qcow2_grow_l1_table(BlockDriverState *bs, int min_size, bool exact_size);
+void qcow2_l2_cache_reset(BlockDriverState *bs);
+int qcow2_decompress_cluster(BlockDriverState *bs, uint64_t cluster_offset);
+void qcow2_encrypt_sectors(BDRVQcowState *s, int64_t sector_num,
+ uint8_t *out_buf, const uint8_t *in_buf,
+ int nb_sectors, int enc,
+ const AES_KEY *key);
+
+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, 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);
+
+/* qcow2-snapshot.c functions */
+int qcow2_snapshot_create(BlockDriverState *bs, QEMUSnapshotInfo *sn_info);
+int qcow2_snapshot_goto(BlockDriverState *bs, const char *snapshot_id);
+int qcow2_snapshot_delete(BlockDriverState *bs, const char *snapshot_id);
+int qcow2_snapshot_list(BlockDriverState *bs, QEMUSnapshotInfo **psn_tab);
+int qcow2_snapshot_load_tmp(BlockDriverState *bs, const char *snapshot_name);
+
+void qcow2_free_snapshots(BlockDriverState *bs);
+int qcow2_read_snapshots(BlockDriverState *bs);
+
+/* qcow2-cache.c functions */
+Qcow2Cache *qcow2_cache_create(BlockDriverState *bs, int num_tables,
+ bool writethrough);
+int qcow2_cache_destroy(BlockDriverState* bs, Qcow2Cache *c);
+bool qcow2_cache_set_writethrough(BlockDriverState *bs, Qcow2Cache *c,
+ bool enable);
+
+void qcow2_cache_entry_mark_dirty(Qcow2Cache *c, void *table);
+int qcow2_cache_flush(BlockDriverState *bs, Qcow2Cache *c);
+int qcow2_cache_set_dependency(BlockDriverState *bs, Qcow2Cache *c,
+ Qcow2Cache *dependency);
+void qcow2_cache_depends_on_flush(Qcow2Cache *c);
+
+int qcow2_cache_get(BlockDriverState *bs, Qcow2Cache *c, uint64_t offset,
+ void **table);
+int qcow2_cache_get_empty(BlockDriverState *bs, Qcow2Cache *c, uint64_t offset,
+ void **table);
+int qcow2_cache_put(BlockDriverState *bs, Qcow2Cache *c, void **table);
#endif
projects / qemu.git / blobdiff