qcow2: Reduce number of I/O requests

[qemu.git] / block / qcow2.h

diff --git a/block/qcow2.h b/block/qcow2.h
index 5217bea8a26e6236e5bf42105f736e47fdcef770..e4ac366cfcfbb3ac45b0edb26add23a91241a678 100644 (file)
--- a/block/qcow2.h
+++ b/block/qcow2.h
@@ -26,6 +26,7 @@
 #define BLOCK_QCOW2_H
 
 #include "aes.h"
+#include "qemu-coroutine.h"
 
 //#define DEBUG_ALLOC
 //#define DEBUG_ALLOC2
@@ -51,6 +52,11 @@
 
 #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;
@@ -72,12 +78,22 @@ typedef struct QCowSnapshot {
     uint32_t l1_size;
     char *id_str;
     char *name;
-    uint32_t vm_state_size;
+    uint64_t vm_state_size;
     uint32_t date_sec;
     uint32_t date_nsec;
     uint64_t vm_clock_nsec;
 } QCowSnapshot;
 
+struct Qcow2Cache;
+typedef struct Qcow2Cache Qcow2Cache;
+
+typedef struct Qcow2UnknownHeaderExtension {
+    uint32_t magic;
+    uint32_t len;
+    QLIST_ENTRY(Qcow2UnknownHeaderExtension) next;
+    uint8_t data[];
+} Qcow2UnknownHeaderExtension;
+
 typedef struct BDRVQcowState {
     int cluster_bits;
     int cluster_size;
@@ -91,9 +107,10 @@ typedef struct BDRVQcowState {
     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;
@@ -102,11 +119,11 @@ typedef struct BDRVQcowState {
     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;
@@ -115,6 +132,9 @@ typedef struct BDRVQcowState {
     int snapshots_size;
     int nb_snapshots;
     QCowSnapshot *snapshots;
+
+    int flags;
+    QLIST_HEAD(, Qcow2UnknownHeaderExtension) unknown_header_ext;
 } BDRVQcowState;
 
 /* XXX: use std qcow open function ? */
@@ -135,11 +155,11 @@ typedef struct QCowL2Meta
 {
     uint64_t offset;
     uint64_t cluster_offset;
+    uint64_t alloc_offset;
     int n_start;
     int nb_available;
     int nb_clusters;
-    struct QCowL2Meta *depends_on;
-    QLIST_HEAD(QCowAioDependencies, QCowAIOCB) dependent_requests;
+    CoQueue dependent_requests;
 
     QLIST_ENTRY(QCowL2Meta) next_in_flight;
 } QCowL2Meta;
@@ -167,20 +187,21 @@ static inline int64_t align_offset(int64_t offset, int n)
 /* qcow2.c functions */
 int qcow2_backing_read1(BlockDriverState *bs, QEMUIOVector *qiov,
                   int64_t sector_num, int nb_sectors);
+int qcow2_update_header(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);
+int qcow2_alloc_clusters_at(BlockDriverState *bs, uint64_t offset,
+    int nb_clusters);
 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);
 
-void qcow2_create_refcount_update(QCowCreateState *s, int64_t offset,
-    int64_t size);
 int qcow2_update_snapshot_refcount(BlockDriverState *bs,
     int64_t l1_table_offset, int l1_size, int addend);
 
@@ -204,6 +225,8 @@ uint64_t qcow2_alloc_compressed_cluster_offset(BlockDriverState *bs,
                                          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);
@@ -215,4 +238,23 @@ 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