BdrvTrackedRequest *req, int64_t offset, unsigned int bytes,
int64_t align, QEMUIOVector *qiov, int flags)
{
+ int64_t total_bytes, max_bytes;
int ret;
assert(is_power_of_2(align));
}
/* Forward the request to the BlockDriver */
- if (!bs->zero_beyond_eof) {
- ret = bdrv_driver_preadv(bs, offset, bytes, qiov, 0);
- } else {
- /* Read zeros after EOF */
- int64_t total_bytes, max_bytes;
-
- total_bytes = bdrv_getlength(bs);
- if (total_bytes < 0) {
- ret = total_bytes;
- goto out;
- }
+ total_bytes = bdrv_getlength(bs);
+ if (total_bytes < 0) {
+ ret = total_bytes;
+ goto out;
+ }
- max_bytes = ROUND_UP(MAX(0, total_bytes - offset), align);
- if (bytes < max_bytes) {
- ret = bdrv_driver_preadv(bs, offset, bytes, qiov, 0);
- } else if (max_bytes > 0) {
- QEMUIOVector local_qiov;
+ max_bytes = ROUND_UP(MAX(0, total_bytes - offset), align);
+ if (bytes < max_bytes) {
+ ret = bdrv_driver_preadv(bs, offset, bytes, qiov, 0);
+ } else if (max_bytes > 0) {
+ QEMUIOVector local_qiov;
- qemu_iovec_init(&local_qiov, qiov->niov);
- qemu_iovec_concat(&local_qiov, qiov, 0, max_bytes);
+ qemu_iovec_init(&local_qiov, qiov->niov);
+ qemu_iovec_concat(&local_qiov, qiov, 0, max_bytes);
- ret = bdrv_driver_preadv(bs, offset, max_bytes, &local_qiov, 0);
+ ret = bdrv_driver_preadv(bs, offset, max_bytes, &local_qiov, 0);
- qemu_iovec_destroy(&local_qiov);
- } else {
- ret = 0;
- }
+ qemu_iovec_destroy(&local_qiov);
+ } else {
+ ret = 0;
+ }
- /* Reading beyond end of file is supposed to produce zeroes */
- if (ret == 0 && total_bytes < offset + bytes) {
- uint64_t zero_offset = MAX(0, total_bytes - offset);
- uint64_t zero_bytes = offset + bytes - zero_offset;
- qemu_iovec_memset(qiov, zero_offset, 0, zero_bytes);
- }
+ /* Reading beyond end of file is supposed to produce zeroes */
+ if (ret == 0 && total_bytes < offset + bytes) {
+ uint64_t zero_offset = MAX(0, total_bytes - offset);
+ uint64_t zero_bytes = offset + bytes - zero_offset;
+ qemu_iovec_memset(qiov, zero_offset, 0, zero_bytes);
}
out: