Archipelago » qemu

typedef enum QCow2MetadataOverlap {

    QCOW2_OL_MAIN_HEADER_BITNR    = 0,

    QCOW2_OL_ACTIVE_L1_BITNR      = 1,

    QCOW2_OL_ACTIVE_L2_BITNR      = 2,

    QCOW2_OL_REFCOUNT_TABLE_BITNR = 3,

    QCOW2_OL_REFCOUNT_BLOCK_BITNR = 4,

    QCOW2_OL_SNAPSHOT_TABLE_BITNR = 5,

    QCOW2_OL_INACTIVE_L1_BITNR    = 6,

    QCOW2_OL_INACTIVE_L2_BITNR    = 7,

    QCOW2_OL_MAX_BITNR            = 8,

    QCOW2_OL_NONE           = 0,

    QCOW2_OL_MAIN_HEADER    = (1 << QCOW2_OL_MAIN_HEADER_BITNR),

    QCOW2_OL_ACTIVE_L1      = (1 << QCOW2_OL_ACTIVE_L1_BITNR),

    QCOW2_OL_ACTIVE_L2      = (1 << QCOW2_OL_ACTIVE_L2_BITNR),

    QCOW2_OL_REFCOUNT_TABLE = (1 << QCOW2_OL_REFCOUNT_TABLE_BITNR),

    QCOW2_OL_REFCOUNT_BLOCK = (1 << QCOW2_OL_REFCOUNT_BLOCK_BITNR),

    QCOW2_OL_SNAPSHOT_TABLE = (1 << QCOW2_OL_SNAPSHOT_TABLE_BITNR),

    QCOW2_OL_INACTIVE_L1    = (1 << QCOW2_OL_INACTIVE_L1_BITNR),

    /* NOTE: Checking overlaps with inactive L2 tables will result in bdrv

     * reads. */

    QCOW2_OL_INACTIVE_L2    = (1 << QCOW2_OL_INACTIVE_L2_BITNR),

} QCow2MetadataOverlap;

/* 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)

/* The default checks to perform */

#define QCOW2_OL_DEFAULT QCOW2_OL_CACHED

int qcow2_check_metadata_overlap(BlockDriverState *bs, int chk, int64_t offset,

                                 int64_t size);

int qcow2_pre_write_overlap_check(BlockDriverState *bs, int chk, int64_t offset,

                                  int64_t size);