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block: change flush to co_flush 

Since coroutine operation is now mandatory, convert all bdrv_flush
implementations to coroutines.  For qcow2, this means taking the lock.
Other implementations are simpler and just forward bdrv_flush to the
underlying protocol, so they can avoid the lock.

The bdrv_flush callback is then unused and can be eliminated.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Paolo Bonzini 2011-10-20 13:16:24 +02:00 committed by Kevin Wolf
parent e183ef75cc
commit 8b94ff8573
10 changed files with 29 additions and 33 deletions
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2
block.c
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@ -2892,8 +2892,6 @@ int coroutine_fn bdrv_co_flush(BlockDriverState *bs)
qemu_coroutine_yield();
return co.ret;
}
} else if (bs->drv->bdrv_flush) {
return bs->drv->bdrv_flush(bs);
} else {
/*
* Some block drivers always operate in either writethrough or unsafe

6
block/cow.c
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@ -306,9 +306,9 @@ exit:
return ret;
}
static int cow_flush(BlockDriverState *bs)
static coroutine_fn int cow_co_flush(BlockDriverState *bs)
{
return bdrv_flush(bs->file);
return bdrv_co_flush(bs->file);
}
static QEMUOptionParameter cow_create_options[] = {
@ -334,7 +334,7 @@ static BlockDriver bdrv_cow = {
.bdrv_write = cow_co_write,
.bdrv_close = cow_close,
.bdrv_create = cow_create,
.bdrv_flush = cow_flush,
.bdrv_co_flush = cow_co_flush,
.bdrv_is_allocated = cow_is_allocated,
.create_options = cow_create_options,

11
block/qcow.c
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@ -781,10 +781,9 @@ static int qcow_write_compressed(BlockDriverState *bs, int64_t sector_num,
return 0;
}
static BlockDriverAIOCB *qcow_aio_flush(BlockDriverState *bs,
BlockDriverCompletionFunc *cb, void *opaque)
static coroutine_fn int qcow_co_flush(BlockDriverState *bs)
{
return bdrv_aio_flush(bs->file, cb, opaque);
return bdrv_co_flush(bs->file);
}
static int qcow_get_info(BlockDriverState *bs, BlockDriverInfo *bdi)
@ -824,9 +823,9 @@ static BlockDriver bdrv_qcow = {
.bdrv_is_allocated = qcow_is_allocated,
.bdrv_set_key = qcow_set_key,
.bdrv_make_empty = qcow_make_empty,
.bdrv_co_readv = qcow_co_readv,
.bdrv_co_writev = qcow_co_writev,
.bdrv_aio_flush = qcow_aio_flush,
.bdrv_co_readv = qcow_co_readv,
.bdrv_co_writev = qcow_co_writev,
.bdrv_co_flush = qcow_co_flush,
.bdrv_write_compressed = qcow_write_compressed,
.bdrv_get_info = qcow_get_info,

14
block/qcow2.c
View File

@ -1099,24 +1099,24 @@ fail:
return ret;
}
static BlockDriverAIOCB *qcow2_aio_flush(BlockDriverState *bs,
BlockDriverCompletionFunc *cb,
void *opaque)
static int qcow2_co_flush(BlockDriverState *bs)
{
BDRVQcowState *s = bs->opaque;
int ret;
qemu_co_mutex_lock(&s->lock);
ret = qcow2_cache_flush(bs, s->l2_table_cache);
if (ret < 0) {
return NULL;
return ret;
}
ret = qcow2_cache_flush(bs, s->refcount_block_cache);
if (ret < 0) {
return NULL;
return ret;
}
qemu_co_mutex_unlock(&s->lock);
return bdrv_aio_flush(bs->file, cb, opaque);
return bdrv_co_flush(bs->file);
}
static int64_t qcow2_vm_state_offset(BDRVQcowState *s)
@ -1237,7 +1237,7 @@ static BlockDriver bdrv_qcow2 = {
.bdrv_co_readv = qcow2_co_readv,
.bdrv_co_writev = qcow2_co_writev,
.bdrv_aio_flush = qcow2_aio_flush,
.bdrv_co_flush = qcow2_co_flush,
.bdrv_discard = qcow2_discard,
.bdrv_truncate = qcow2_truncate,

4
block/raw-win32.c
View File

@ -281,7 +281,7 @@ static BlockDriver bdrv_file = {
.bdrv_file_open = raw_open,
.bdrv_close = raw_close,
.bdrv_create = raw_create,
.bdrv_flush = raw_flush,
.bdrv_co_flush = raw_flush,
.bdrv_read = raw_read,
.bdrv_write = raw_write,
.bdrv_truncate = raw_truncate,
@ -409,7 +409,7 @@ static BlockDriver bdrv_host_device = {
.bdrv_probe_device = hdev_probe_device,
.bdrv_file_open = hdev_open,
.bdrv_close = raw_close,
.bdrv_flush = raw_flush,
.bdrv_co_flush = raw_flush,
.bdrv_has_zero_init = hdev_has_zero_init,
.bdrv_read = raw_read,

4
block/rbd.c
View File

@ -705,7 +705,7 @@ static BlockDriverAIOCB *qemu_rbd_aio_writev(BlockDriverState *bs,
return rbd_aio_rw_vector(bs, sector_num, qiov, nb_sectors, cb, opaque, 1);
}
static int qemu_rbd_flush(BlockDriverState *bs)
static int qemu_rbd_co_flush(BlockDriverState *bs)
{
#if LIBRBD_VERSION_CODE >= LIBRBD_VERSION(0, 1, 1)
/* rbd_flush added in 0.1.1 */
@ -851,7 +851,7 @@ static BlockDriver bdrv_rbd = {
.bdrv_file_open = qemu_rbd_open,
.bdrv_close = qemu_rbd_close,
.bdrv_create = qemu_rbd_create,
.bdrv_flush = qemu_rbd_flush,
.bdrv_co_flush = qemu_rbd_co_flush,
.bdrv_get_info = qemu_rbd_getinfo,
.create_options = qemu_rbd_create_options,
.bdrv_getlength = qemu_rbd_getlength,

6
block/vdi.c
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@ -936,10 +936,10 @@ static void vdi_close(BlockDriverState *bs)
{
}
static int vdi_flush(BlockDriverState *bs)
static coroutine_fn int vdi_co_flush(BlockDriverState *bs)
{
logout("\n");
return bdrv_flush(bs->file);
return bdrv_co_flush(bs->file);
}
@ -975,7 +975,7 @@ static BlockDriver bdrv_vdi = {
.bdrv_open = vdi_open,
.bdrv_close = vdi_close,
.bdrv_create = vdi_create,
.bdrv_flush = vdi_flush,
.bdrv_co_flush = vdi_co_flush,
.bdrv_is_allocated = vdi_is_allocated,
.bdrv_make_empty = vdi_make_empty,

8
block/vmdk.c
View File

@ -1494,14 +1494,14 @@ static void vmdk_close(BlockDriverState *bs)
vmdk_free_extents(bs);
}
static int vmdk_flush(BlockDriverState *bs)
static coroutine_fn int vmdk_co_flush(BlockDriverState *bs)
{
int i, ret, err;
BDRVVmdkState *s = bs->opaque;
ret = bdrv_flush(bs->file);
ret = bdrv_co_flush(bs->file);
for (i = 0; i < s->num_extents; i++) {
err = bdrv_flush(s->extents[i].file);
err = bdrv_co_flush(s->extents[i].file);
if (err < 0) {
ret = err;
}
@ -1568,7 +1568,7 @@ static BlockDriver bdrv_vmdk = {
.bdrv_write = vmdk_co_write,
.bdrv_close = vmdk_close,
.bdrv_create = vmdk_create,
.bdrv_flush = vmdk_flush,
.bdrv_co_flush = vmdk_co_flush,
.bdrv_is_allocated = vmdk_is_allocated,
.bdrv_get_allocated_file_size = vmdk_get_allocated_file_size,

6
block/vpc.c
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@ -467,9 +467,9 @@ static coroutine_fn int vpc_co_write(BlockDriverState *bs, int64_t sector_num,
return ret;
}
static int vpc_flush(BlockDriverState *bs)
static coroutine_fn int vpc_co_flush(BlockDriverState *bs)
{
return bdrv_flush(bs->file);
return bdrv_co_flush(bs->file);
}
/*
@ -665,7 +665,7 @@ static BlockDriver bdrv_vpc = {
.bdrv_open = vpc_open,
.bdrv_read = vpc_co_read,
.bdrv_write = vpc_co_write,
.bdrv_flush = vpc_flush,
.bdrv_co_flush = vpc_co_flush,
.bdrv_close = vpc_close,
.bdrv_create = vpc_create,

1
block_int.h
View File

@ -62,7 +62,6 @@ struct BlockDriver {
const uint8_t *buf, int nb_sectors);
void (*bdrv_close)(BlockDriverState *bs);
int (*bdrv_create)(const char *filename, QEMUOptionParameter *options);
int (*bdrv_flush)(BlockDriverState *bs);
int (*bdrv_discard)(BlockDriverState *bs, int64_t sector_num,
int nb_sectors);
int (*bdrv_is_allocated)(BlockDriverState *bs, int64_t sector_num,