@@ -371,23 +371,33 @@ fail:
static int vpc_read(BlockDriverState *bs, int64_t sector_num,
uint8_t *buf, int nb_sectors)
{
+ BDRVVPCState *s = bs->opaque;
int ret;
int64_t offset;
+ int64_t sectors, sectors_per_block;
while (nb_sectors > 0) {
offset = get_sector_offset(bs, sector_num, 0);
+ sectors_per_block = s->block_size >> BDRV_SECTOR_BITS;
+ sectors = sectors_per_block - (sector_num % sectors_per_block);
+ if (sectors > nb_sectors) {
+ sectors = nb_sectors;
+ }
+
if (offset == -1) {
- memset(buf, 0, 512);
+ memset(buf, 0, sectors * BDRV_SECTOR_SIZE);
} else {
- ret = bdrv_pread(bs->file, offset, buf, 512);
- if (ret != 512)
+ ret = bdrv_pread(bs->file, offset, buf,
+ sectors * BDRV_SECTOR_SIZE);
+ if (ret != sectors * BDRV_SECTOR_SIZE) {
return -1;
+ }
}
- nb_sectors--;
- sector_num++;
- buf += 512;
+ nb_sectors -= sectors;
+ sector_num += sectors;
+ buf += sectors * BDRV_SECTOR_SIZE;
}
return 0;
}
@@ -395,25 +405,34 @@ static int vpc_read(BlockDriverState *bs, int64_t sector_num,
static int vpc_write(BlockDriverState *bs, int64_t sector_num,
const uint8_t *buf, int nb_sectors)
{
+ BDRVVPCState *s = bs->opaque;
int64_t offset;
+ int64_t sectors, sectors_per_block;
int ret;
while (nb_sectors > 0) {
offset = get_sector_offset(bs, sector_num, 1);
+ sectors_per_block = s->block_size >> BDRV_SECTOR_BITS;
+ sectors = sectors_per_block - (sector_num % sectors_per_block);
+ if (sectors > nb_sectors) {
+ sectors = nb_sectors;
+ }
+
if (offset == -1) {
offset = alloc_block(bs, sector_num);
if (offset < 0)
return -1;
}
- ret = bdrv_pwrite(bs->file, offset, buf, 512);
- if (ret != 512)
+ ret = bdrv_pwrite(bs->file, offset, buf, sectors * BDRV_SECTOR_SIZE);
+ if (ret != sectors * BDRV_SECTOR_SIZE) {
return -1;
+ }
- nb_sectors--;
- sector_num++;
- buf += 512;
+ nb_sectors -= sectors;
+ sector_num += sectors;
+ buf += sectors * BDRV_SECTOR_SIZE;
}
return 0;
This changes the vpc block driver (for VHD) to read/write multiple sectors at once instead of doing a request for each single sector. Before this, running qemu-iotests for VPC took ages, now it's actually quite reasonable to run it always (down from ~1 hour to 40 seconds for me). Signed-off-by: Kevin Wolf <kwolf@redhat.com> --- block/vpc.c | 41 ++++++++++++++++++++++++++++++----------- 1 files changed, 30 insertions(+), 11 deletions(-)