block: Use bdrv_nb_sectors() where sectors, not bytes are wanted

Instead of bdrv_getlength().

Aside: a few of these callers don't handle errors.  I didn't
investigate whether they should.

Signed-off-by: Markus Armbruster <armbru@redhat.com>
Reviewed-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Benoit Canet <benoit@irqsave.net>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>

block-migration.c

@@ -186,7 +186,7 @@ static int bmds_aio_inflight(BlkMigDevState *bmds, int64_t sector)
 {
     int64_t chunk = sector / (int64_t)BDRV_SECTORS_PER_DIRTY_CHUNK;
 
-    if ((sector << BDRV_SECTOR_BITS) < bdrv_getlength(bmds->bs)) {
+    if (sector < bdrv_nb_sectors(bmds->bs)) {
         return !!(bmds->aio_bitmap[chunk / (sizeof(unsigned long) * 8)] &
             (1UL << (chunk % (sizeof(unsigned long) * 8))));
     } else {
@@ -223,8 +223,7 @@ static void alloc_aio_bitmap(BlkMigDevState *bmds)
     BlockDriverState *bs = bmds->bs;
     int64_t bitmap_size;
 
-    bitmap_size = (bdrv_getlength(bs) >> BDRV_SECTOR_BITS) +
-            BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1;
+    bitmap_size = bdrv_nb_sectors(bs) + BDRV_SECTORS_PER_DIRTY_CHUNK * 8 - 1;
     bitmap_size /= BDRV_SECTORS_PER_DIRTY_CHUNK * 8;
 
     bmds->aio_bitmap = g_malloc0(bitmap_size);
@@ -350,7 +349,7 @@ static void init_blk_migration_it(void *opaque, BlockDriverState *bs)
     int64_t sectors;
 
     if (!bdrv_is_read_only(bs)) {
-        sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS;
+        sectors = bdrv_nb_sectors(bs);
         if (sectors <= 0) {
             return;
         }
@@ -799,7 +798,7 @@ static int block_load(QEMUFile *f, void *opaque, int version_id)
 
             if (bs != bs_prev) {
                 bs_prev = bs;
-                total_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS;
+                total_sectors = bdrv_nb_sectors(bs);
                 if (total_sectors <= 0) {
                     error_report("Error getting length of block device %s",
                                  device_name);

block.c

@@ -5283,13 +5283,12 @@ BdrvDirtyBitmap *bdrv_create_dirty_bitmap(BlockDriverState *bs, int granularity,
 
     granularity >>= BDRV_SECTOR_BITS;
     assert(granularity);
-    bitmap_size = bdrv_getlength(bs);
+    bitmap_size = bdrv_nb_sectors(bs);
     if (bitmap_size < 0) {
         error_setg_errno(errp, -bitmap_size, "could not get length of device");
         errno = -bitmap_size;
         return NULL;
     }
-    bitmap_size >>= BDRV_SECTOR_BITS;
     bitmap = g_malloc0(sizeof(BdrvDirtyBitmap));
     bitmap->bitmap = hbitmap_alloc(bitmap_size, ffs(granularity) - 1);
     QLIST_INSERT_HEAD(&bs->dirty_bitmaps, bitmap, list);

block/qcow2.c

@@ -1557,7 +1557,7 @@ static int preallocate(BlockDriverState *bs)
     int ret;
     QCowL2Meta *meta;
 
-    nb_sectors = bdrv_getlength(bs) >> BDRV_SECTOR_BITS;
+    nb_sectors = bdrv_nb_sectors(bs);
     offset = 0;
 
     while (nb_sectors) {

block/vmdk.c

@@ -669,8 +669,7 @@ static int vmdk_open_vmdk4(BlockDriverState *bs,
     if (le32_to_cpu(header.flags) & VMDK4_FLAG_RGD) {
         l1_backup_offset = le64_to_cpu(header.rgd_offset) << 9;
     }
-    if (bdrv_getlength(file) <
-            le64_to_cpu(header.grain_offset) * BDRV_SECTOR_SIZE) {
+    if (bdrv_nb_sectors(file) < le64_to_cpu(header.grain_offset)) {
         error_setg(errp, "File truncated, expecting at least %" PRId64 " bytes",
                    (int64_t)(le64_to_cpu(header.grain_offset)
                              * BDRV_SECTOR_SIZE));
@@ -1999,7 +1998,7 @@ static int vmdk_check(BlockDriverState *bs, BdrvCheckResult *result,
     BDRVVmdkState *s = bs->opaque;
     VmdkExtent *extent = NULL;
     int64_t sector_num = 0;
-    int64_t total_sectors = bdrv_getlength(bs) / BDRV_SECTOR_SIZE;
+    int64_t total_sectors = bdrv_nb_sectors(bs);
     int ret;
     uint64_t cluster_offset;