int nb_sectors, int *pnum)
{
BDRVParallelsState *s = bs->opaque;
- uint32_t idx, to_allocate, i;
- int64_t pos, space;
+ int64_t pos, space, idx, to_allocate, i;
pos = block_status(s, sector_num, nb_sectors, pnum);
if (pos > 0) {
}
idx = sector_num / s->tracks;
- if (idx >= s->bat_size) {
- return -EINVAL;
- }
-
to_allocate = DIV_ROUND_UP(sector_num + *pnum, s->tracks) - idx;
+
+ /* This function is called only by parallels_co_writev(), which will never
+ * pass a sector_num at or beyond the end of the image (because the block
+ * layer never passes such a sector_num to that function). Therefore, idx
+ * is always below s->bat_size.
+ * block_status() will limit *pnum so that sector_num + *pnum will not
+ * exceed the image end. Therefore, idx + to_allocate cannot exceed
+ * s->bat_size.
+ * Note that s->bat_size is an unsigned int, therefore idx + to_allocate
+ * will always fit into a uint32_t. */
+ assert(idx < s->bat_size && idx + to_allocate <= s->bat_size);
+
space = to_allocate * s->tracks;
if (s->data_end + space > bdrv_getlength(bs->file->bs) >> BDRV_SECTOR_BITS) {
int ret;
if (local_err != NULL) {
goto fail_options;
}
- if (!bdrv_has_zero_init(bs->file->bs) ||
+
+ if (!(flags & BDRV_O_RESIZE) || !bdrv_has_zero_init(bs->file->bs) ||
bdrv_truncate(bs->file, bdrv_getlength(bs->file->bs)) != 0) {
s->prealloc_mode = PRL_PREALLOC_MODE_FALLOCATE;
}