9p: darwin: Move XATTR_SIZE_MAX->P9_XATTR_SIZE_MAX

[mirror_qemu.git] / block / qcow2.h

diff --git a/block/qcow2.h b/block/qcow2.h
index b71e444fca7727363558c309b587d0d9a574399a..fd48a89d452cd34919e8b2577fdb0e0f6d24755b 100644 (file)
--- a/block/qcow2.h
+++ b/block/qcow2.h
@@ -110,7 +110,6 @@
 
 /* Defined in the qcow2 spec (compressed cluster descriptor) */
 #define QCOW2_COMPRESSED_SECTOR_SIZE 512U
-#define QCOW2_COMPRESSED_SECTOR_MASK (~(QCOW2_COMPRESSED_SECTOR_SIZE - 1ULL))
 
 /* Must be at least 2 to cover COW */
 #define MIN_L2_CACHE_SIZE 2 /* cache entries */
@@ -206,6 +205,7 @@ typedef struct QEMU_PACKED QCowSnapshotHeader {
 typedef struct QEMU_PACKED QCowSnapshotExtraData {
     uint64_t vm_state_size_large;
     uint64_t disk_size;
+    uint64_t icount;
 } QCowSnapshotExtraData;
 
 
@@ -219,6 +219,8 @@ typedef struct QCowSnapshot {
     uint32_t date_sec;
     uint32_t date_nsec;
     uint64_t vm_clock_nsec;
+    /* icount value for the moment when snapshot was taken */
+    uint64_t icount;
     /* Size of all extra data, including QCowSnapshotExtraData if available */
     uint32_t extra_data_size;
     /* Data beyond QCowSnapshotExtraData, if any */
@@ -340,8 +342,8 @@ typedef struct BDRVQcow2State {
     uint64_t l1_table_offset;
     uint64_t *l1_table;
 
-    Qcow2Cache* l2_table_cache;
-    Qcow2Cache* refcount_block_cache;
+    Qcow2Cache *l2_table_cache;
+    Qcow2Cache *refcount_block_cache;
     QEMUTimer *cache_clean_timer;
     unsigned cache_clean_interval;
 
@@ -391,7 +393,7 @@ typedef struct BDRVQcow2State {
     uint64_t autoclear_features;
 
     size_t unknown_header_fields_size;
-    void* unknown_header_fields;
+    void *unknown_header_fields;
     QLIST_HEAD(, Qcow2UnknownHeaderExtension) unknown_header_ext;
     QTAILQ_HEAD (, Qcow2DiscardRegion) discards;
     bool cache_discards;
@@ -432,17 +434,18 @@ typedef struct Qcow2COWRegion {
 
 /**
  * Describes an in-flight (part of a) write request that writes to clusters
- * that are not referenced in their L2 table yet.
+ * that need to have their L2 table entries updated (because they are
+ * newly allocated or need changes in their L2 bitmaps)
  */
 typedef struct QCowL2Meta
 {
-    /** Guest offset of the first newly allocated cluster */
+    /** Guest offset of the first updated cluster */
     uint64_t offset;
 
-    /** Host offset of the first newly allocated cluster */
+    /** Host offset of the first updated cluster */
     uint64_t alloc_offset;
 
-    /** Number of newly allocated clusters */
+    /** Number of updated clusters */
     int nb_clusters;
 
     /** Do not free the old clusters */
@@ -455,14 +458,16 @@ typedef struct QCowL2Meta
     CoQueue dependent_requests;
 
     /**
-     * The COW Region between the start of the first allocated cluster and the
-     * area the guest actually writes to.
+     * The COW Region immediately before the area the guest actually
+     * writes to. This (part of the) write request starts at
+     * cow_start.offset + cow_start.nb_bytes.
      */
     Qcow2COWRegion cow_start;
 
     /**
-     * The COW Region between the area the guest actually writes to and the
-     * end of the last allocated cluster.
+     * The COW Region immediately after the area the guest actually
+     * writes to. This (part of the) write request ends at cow_end.offset
+     * (which must always be set even when cow_end.nb_bytes is 0).
      */
     Qcow2COWRegion cow_end;
 
@@ -581,10 +586,12 @@ typedef enum QCow2MetadataOverlap {
     (QCOW2_OL_CACHED | QCOW2_OL_INACTIVE_L2)
 
 #define L1E_OFFSET_MASK 0x00fffffffffffe00ULL
+#define L1E_RESERVED_MASK 0x7f000000000001ffULL
 #define L2E_OFFSET_MASK 0x00fffffffffffe00ULL
-#define L2E_COMPRESSED_OFFSET_SIZE_MASK 0x3fffffffffffffffULL
+#define L2E_STD_RESERVED_MASK 0x3f000000000001feULL
 
 #define REFT_OFFSET_MASK 0xfffffffffffffe00ULL
+#define REFT_RESERVED_MASK 0x1ffULL
 
 #define INV_OFFSET (-1ULL)
 
@@ -908,6 +915,8 @@ int qcow2_alloc_compressed_cluster_offset(BlockDriverState *bs,
                                           uint64_t offset,
                                           int compressed_size,
                                           uint64_t *host_offset);
+void qcow2_parse_compressed_l2_entry(BlockDriverState *bs, uint64_t l2_entry,
+                                     uint64_t *coffset, int *csize);
 
 int qcow2_alloc_cluster_link_l2(BlockDriverState *bs, QCowL2Meta *m);
 void qcow2_alloc_cluster_abort(BlockDriverState *bs, QCowL2Meta *m);
@@ -972,12 +981,13 @@ void qcow2_cache_discard(Qcow2Cache *c, void *table);
 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);
+bool qcow2_load_dirty_bitmaps(BlockDriverState *bs, bool *header_updated,
+                              Error **errp);
+bool qcow2_get_bitmap_info_list(BlockDriverState *bs,
+                                Qcow2BitmapInfoList **info_list, Error **errp);
 int qcow2_reopen_bitmaps_rw(BlockDriverState *bs, Error **errp);
 int qcow2_truncate_bitmaps_check(BlockDriverState *bs, Error **errp);
-void qcow2_store_persistent_dirty_bitmaps(BlockDriverState *bs,
+bool qcow2_store_persistent_dirty_bitmaps(BlockDriverState *bs,
                                           bool release_stored, Error **errp);
 int qcow2_reopen_bitmaps_ro(BlockDriverState *bs, Error **errp);
 bool qcow2_co_can_store_new_dirty_bitmap(BlockDriverState *bs,