block: Drop use of Stat64

The Stat64 structure is an aid for 32-bit hosts, and
is no longer required.  Use plain 64-bit types.

Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>

block/io.c

@@ -39,6 +39,7 @@
 #include "qemu/main-loop.h"
 #include "system/replay.h"
 #include "qemu/units.h"
+#include "qemu/atomic.h"
 
 /* Maximum bounce buffer for copy-on-read and write zeroes, in bytes */
 #define MAX_BOUNCE_BUFFER (32768 << BDRV_SECTOR_BITS)
@@ -2044,7 +2045,14 @@ bdrv_co_write_req_finish(BdrvChild *child, int64_t offset, int64_t bytes,
     if (req->bytes) {
         switch (req->type) {
         case BDRV_TRACKED_WRITE:
-            stat64_max(&bs->wr_highest_offset, offset + bytes);
+            {
+                uint64_t new = offset + bytes;
+                uint64_t old = qatomic_read(&bs->wr_highest_offset);
+
+                while (old < new) {
+                    old = qatomic_cmpxchg(&bs->wr_highest_offset, old, new);
+                }
+            }
             /* fall through, to set dirty bits */
         case BDRV_TRACKED_DISCARD:
             bdrv_set_dirty(bs, offset, bytes);

block/qapi.c

@@ -651,7 +651,7 @@ bdrv_query_bds_stats(BlockDriverState *bs, bool blk_level)
         s->node_name = g_strdup(bdrv_get_node_name(bs));
     }
 
-    s->stats->wr_highest_offset = stat64_get(&bs->wr_highest_offset);
+    s->stats->wr_highest_offset = qatomic_read(&bs->wr_highest_offset);
 
     s->driver_specific = bdrv_get_specific_stats(bs);
 

include/block/block_int-common.h

@@ -30,7 +30,6 @@
 #include "qemu/aiocb.h"
 #include "qemu/iov.h"
 #include "qemu/rcu.h"
-#include "qemu/stats64.h"
 
 #define BLOCK_FLAG_LAZY_REFCOUNTS   8
 
@@ -1246,7 +1245,7 @@ struct BlockDriverState {
     QLIST_HEAD(, BdrvDirtyBitmap) dirty_bitmaps;
 
     /* Offset after the highest byte written to */
-    Stat64 wr_highest_offset;
+    uint64_t wr_highest_offset;
 
     /*
      * If true, copy read backing sectors into image.  Can be >1 if more