static void do_multiwrite(BlockDriverState *bs, BlockRequest *blkreq,
int num_writes)
{
int i, ret;
ret = bdrv_aio_multiwrite(bs, blkreq, num_writes);
if (ret != 0) {
for (i = 0; i < num_writes; i++) {
if (blkreq[i].error) {
virtio_blk_rw_complete(blkreq[i].opaque, -EIO);
}
}
}
}
static int do_aio_multiwrite(BlockRequest* reqs, int num_reqs, int *total)
{
int i, ret;
struct multiwrite_async_ret async_ret = {
.num_done = 0,
.error = 0,
};
*total = 0;
for (i = 0; i < num_reqs; i++) {
reqs[i].cb = multiwrite_cb;
reqs[i].opaque = &async_ret;
*total += reqs[i].qiov->size;
}
ret = bdrv_aio_multiwrite(bs, reqs, num_reqs);
if (ret < 0) {
return ret;
}
while (async_ret.num_done < num_reqs) {
qemu_aio_wait();
}
return async_ret.error < 0 ? async_ret.error : 1;
}
static void
read_help(void)
{
printf(
"\n"
" reads a range of bytes from the given offset\n"
"\n"
" Example:\n"
" 'read -v 512 1k' - dumps 1 kilobyte read from 512 bytes into the file\n"
"\n"
" Reads a segment of the currently open file, optionally dumping it to the\n"
" standard output stream (with -v option) for subsequent inspection.\n"
" -b, -- read from the VM state rather than the virtual disk\n"
" -C, -- report statistics in a machine parsable format\n"
" -l, -- length for pattern verification (only with -P)\n"
" -p, -- use bdrv_pread to read the file\n"
" -P, -- use a pattern to verify read data\n"
" -q, -- quite mode, do not show I/O statistics\n"
" -s, -- start offset for pattern verification (only with -P)\n"
" -v, -- dump buffer to standard output\n"
"\n");
}
static void virtio_submit_multiwrite(BlockDriverState *bs, MultiReqBuffer *mrb)
{
int i, ret;
if (!mrb->num_writes) {
return;
}
ret = bdrv_aio_multiwrite(bs, mrb->blkreq, mrb->num_writes);
if (ret != 0) {
for (i = 0; i < mrb->num_writes; i++) {
if (mrb->blkreq[i].error) {
virtio_blk_rw_complete(mrb->blkreq[i].opaque, -EIO);
}
}
}
mrb->num_writes = 0;
}