@@ -611,53 +611,55 @@ vdi_co_preadv(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
return ret;
}
-static int vdi_co_write(BlockDriverState *bs,
- int64_t sector_num, const uint8_t *buf, int nb_sectors)
+static int coroutine_fn
+vdi_co_pwritev(BlockDriverState *bs, uint64_t offset, uint64_t bytes,
+ QEMUIOVector *qiov, int flags)
{
BDRVVdiState *s = bs->opaque;
+ QEMUIOVector local_qiov;
uint32_t bmap_entry;
uint32_t block_index;
- uint32_t sector_in_block;
- uint32_t n_sectors;
+ uint32_t offset_in_block;
+ uint32_t n_bytes;
uint32_t bmap_first = VDI_UNALLOCATED;
uint32_t bmap_last = VDI_UNALLOCATED;
uint8_t *block = NULL;
+ uint64_t bytes_done = 0;
int ret = 0;
logout("\n");
- while (ret >= 0 && nb_sectors > 0) {
- block_index = sector_num / s->block_sectors;
- sector_in_block = sector_num % s->block_sectors;
- n_sectors = s->block_sectors - sector_in_block;
- if (n_sectors > nb_sectors) {
- n_sectors = nb_sectors;
- }
+ qemu_iovec_init(&local_qiov, qiov->niov);
- logout("will write %u sectors starting at sector %" PRIu64 "\n",
- n_sectors, sector_num);
+ while (ret >= 0 && bytes > 0) {
+ block_index = offset / s->block_size;
+ offset_in_block = offset % s->block_size;
+ n_bytes = MIN(bytes, s->block_size - offset_in_block);
+
+ logout("will write %u bytes starting at offset %" PRIu64 "\n",
+ n_bytes, offset);
/* prepare next AIO request */
bmap_entry = le32_to_cpu(s->bmap[block_index]);
if (!VDI_IS_ALLOCATED(bmap_entry)) {
/* Allocate new block and write to it. */
- uint64_t offset;
+ uint64_t data_offset;
bmap_entry = s->header.blocks_allocated;
s->bmap[block_index] = cpu_to_le32(bmap_entry);
s->header.blocks_allocated++;
- offset = s->header.offset_data / SECTOR_SIZE +
- (uint64_t)bmap_entry * s->block_sectors;
+ data_offset = s->header.offset_data +
+ (uint64_t)bmap_entry * s->block_size;
if (block == NULL) {
block = g_malloc(s->block_size);
bmap_first = block_index;
}
bmap_last = block_index;
/* Copy data to be written to new block and zero unused parts. */
- memset(block, 0, sector_in_block * SECTOR_SIZE);
- memcpy(block + sector_in_block * SECTOR_SIZE,
- buf, n_sectors * SECTOR_SIZE);
- memset(block + (sector_in_block + n_sectors) * SECTOR_SIZE, 0,
- (s->block_sectors - n_sectors - sector_in_block) * SECTOR_SIZE);
+ memset(block, 0, offset_in_block);
+ qemu_iovec_to_buf(qiov, bytes_done, block + offset_in_block,
+ n_bytes);
+ memset(block + offset_in_block + n_bytes, 0,
+ s->block_size - n_bytes - offset_in_block);
/* Note that this coroutine does not yield anywhere from reading the
* bmap entry until here, so in regards to all the coroutines trying
@@ -667,12 +669,12 @@ static int vdi_co_write(BlockDriverState *bs,
* acquire the lock and thus the padded cluster is written before
* the other coroutines can write to the affected area. */
qemu_co_mutex_lock(&s->write_lock);
- ret = bdrv_write(bs->file->bs, offset, block, s->block_sectors);
+ ret = bdrv_pwrite(bs->file->bs, data_offset, block, s->block_size);
qemu_co_mutex_unlock(&s->write_lock);
} else {
- uint64_t offset = s->header.offset_data / SECTOR_SIZE +
- (uint64_t)bmap_entry * s->block_sectors +
- sector_in_block;
+ uint64_t data_offset = s->header.offset_data +
+ (uint64_t)bmap_entry * s->block_size +
+ offset_in_block;
qemu_co_mutex_lock(&s->write_lock);
/* This lock is only used to make sure the following write operation
* is executed after the write issued by the coroutine allocating
@@ -683,16 +685,23 @@ static int vdi_co_write(BlockDriverState *bs,
* that that write operation has returned (there may be other writes
* in flight, but they do not concern this very operation). */
qemu_co_mutex_unlock(&s->write_lock);
- ret = bdrv_write(bs->file->bs, offset, buf, n_sectors);
+
+ qemu_iovec_reset(&local_qiov);
+ qemu_iovec_concat(&local_qiov, qiov, bytes_done, n_bytes);
+
+ ret = bdrv_co_pwritev(bs->file->bs, data_offset, n_bytes,
+ &local_qiov, 0);
}
- nb_sectors -= n_sectors;
- sector_num += n_sectors;
- buf += n_sectors * SECTOR_SIZE;
+ bytes -= n_bytes;
+ offset += n_bytes;
+ bytes_done += n_bytes;
- logout("%u sectors written\n", n_sectors);
+ logout("%u bytes written\n", n_bytes);
}
+ qemu_iovec_destroy(&local_qiov);
+
logout("finished data write\n");
if (ret < 0) {
return ret;
@@ -703,6 +712,7 @@ static int vdi_co_write(BlockDriverState *bs,
VdiHeader *header = (VdiHeader *) block;
uint8_t *base;
uint64_t offset;
+ uint32_t n_sectors;
logout("now writing modified header\n");
assert(VDI_IS_ALLOCATED(bmap_first));
@@ -914,7 +924,7 @@ static BlockDriver bdrv_vdi = {
.bdrv_co_preadv = vdi_co_preadv,
#if defined(CONFIG_VDI_WRITE)
- .bdrv_write = vdi_co_write,
+ .bdrv_co_pwritev = vdi_co_pwritev,
#endif
.bdrv_get_info = vdi_get_info,