qcow2: remove cluster_offset from QCowAIOCB

Signed-off-by: NFrediano Ziglio <freddy77@gmail.com>
Signed-off-by: NKevin Wolf <kwolf@redhat.com>

block/qcow2.c

@@ -382,7 +382,6 @@ typedef struct QCowAIOCB {
     QEMUIOVector *qiov;
     int remaining_sectors;
     uint64_t bytes_done;
-    uint64_t cluster_offset;
     uint8_t *cluster_data;
     QEMUIOVector hd_qiov;
 } QCowAIOCB;
@@ -398,6 +397,7 @@ static int qcow2_aio_read_cb(QCowAIOCB *acb)
     int index_in_cluster, n1;
     int ret;
     int cur_nr_sectors; /* number of sectors in current iteration */
+    uint64_t cluster_offset = 0;
 
     if (acb->remaining_sectors == 0) {
         /* request completed */
@@ -412,7 +412,7 @@ static int qcow2_aio_read_cb(QCowAIOCB *acb)
     }
 
     ret = qcow2_get_cluster_offset(bs, acb->sector_num << 9,
-        &cur_nr_sectors, &acb->cluster_offset);
+        &cur_nr_sectors, &cluster_offset);
     if (ret < 0) {
         return ret;
     }
@@ -423,7 +423,7 @@ static int qcow2_aio_read_cb(QCowAIOCB *acb)
     qemu_iovec_copy(&acb->hd_qiov, acb->qiov, acb->bytes_done,
         cur_nr_sectors * 512);
 
-    if (!acb->cluster_offset) {
+    if (!cluster_offset) {
 
         if (bs->backing_hd) {
             /* read from the base image */
@@ -443,9 +443,9 @@ static int qcow2_aio_read_cb(QCowAIOCB *acb)
             /* Note: in this case, no need to wait */
             qemu_iovec_memset(&acb->hd_qiov, 0, 512 * cur_nr_sectors);
         }
-    } else if (acb->cluster_offset & QCOW_OFLAG_COMPRESSED) {
+    } else if (cluster_offset & QCOW_OFLAG_COMPRESSED) {
         /* add AIO support for compressed blocks ? */
-        ret = qcow2_decompress_cluster(bs, acb->cluster_offset);
+        ret = qcow2_decompress_cluster(bs, cluster_offset);
         if (ret < 0) {
             return ret;
         }
@@ -454,7 +454,7 @@ static int qcow2_aio_read_cb(QCowAIOCB *acb)
             s->cluster_cache + index_in_cluster * 512,
             512 * cur_nr_sectors);
     } else {
-        if ((acb->cluster_offset & 511) != 0) {
+        if ((cluster_offset & 511) != 0) {
             return -EIO;
         }
 
@@ -478,7 +478,7 @@ static int qcow2_aio_read_cb(QCowAIOCB *acb)
         BLKDBG_EVENT(bs->file, BLKDBG_READ_AIO);
         qemu_co_mutex_unlock(&s->lock);
         ret = bdrv_co_readv(bs->file,
-                            (acb->cluster_offset >> 9) + index_in_cluster,
+                            (cluster_offset >> 9) + index_in_cluster,
                             cur_nr_sectors, &acb->hd_qiov);
         qemu_co_mutex_lock(&s->lock);
         if (ret < 0) {
@@ -516,7 +516,6 @@ static QCowAIOCB *qcow2_aio_setup(BlockDriverState *bs, int64_t sector_num,
 
     acb->bytes_done = 0;
     acb->remaining_sectors = nb_sectors;
-    acb->cluster_offset = 0;
     return acb;
 }
 
@@ -568,6 +567,7 @@ static int qcow2_aio_write_cb(QCowAIOCB *acb)
     int ret;
     int cur_nr_sectors; /* number of sectors in current iteration */
     QCowL2Meta l2meta;
+    uint64_t cluster_offset;
 
     l2meta.nb_clusters = 0;
     qemu_co_queue_init(&l2meta.dependent_requests);
@@ -589,8 +589,8 @@ static int qcow2_aio_write_cb(QCowAIOCB *acb)
         return ret;
     }
 
-    acb->cluster_offset = l2meta.cluster_offset;
-    assert((acb->cluster_offset & 511) == 0);
+    cluster_offset = l2meta.cluster_offset;
+    assert((cluster_offset & 511) == 0);
 
     qemu_iovec_reset(&acb->hd_qiov);
     qemu_iovec_copy(&acb->hd_qiov, acb->qiov, acb->bytes_done,
@@ -616,7 +616,7 @@ static int qcow2_aio_write_cb(QCowAIOCB *acb)
     BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO);
     qemu_co_mutex_unlock(&s->lock);
     ret = bdrv_co_writev(bs->file,
-                         (acb->cluster_offset >> 9) + index_in_cluster,
+                         (cluster_offset >> 9) + index_in_cluster,
                          cur_nr_sectors, &acb->hd_qiov);
     qemu_co_mutex_lock(&s->lock);
     if (ret < 0) {