diff options
Diffstat (limited to 'block.c')
| -rw-r--r-- | block.c | 29 |
1 files changed, 29 insertions, 0 deletions
@@ -50,6 +50,8 @@ static BlockDriverAIOCB *bdrv_aio_writev_em(BlockDriverState *bs, BlockDriverCompletionFunc *cb, void *opaque); static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs, BlockDriverCompletionFunc *cb, void *opaque); +static BlockDriverAIOCB *bdrv_aio_noop_em(BlockDriverState *bs, + BlockDriverCompletionFunc *cb, void *opaque); static int bdrv_read_em(BlockDriverState *bs, int64_t sector_num, uint8_t *buf, int nb_sectors); static int bdrv_write_em(BlockDriverState *bs, int64_t sector_num, @@ -1312,6 +1314,10 @@ const char *bdrv_get_device_name(BlockDriverState *bs) void bdrv_flush(BlockDriverState *bs) { + if (bs->open_flags & BDRV_O_NO_FLUSH) { + return; + } + if (bs->drv && bs->drv->bdrv_flush) bs->drv->bdrv_flush(bs); } @@ -2099,6 +2105,10 @@ BlockDriverAIOCB *bdrv_aio_flush(BlockDriverState *bs, { BlockDriver *drv = bs->drv; + if (bs->open_flags & BDRV_O_NO_FLUSH) { + return bdrv_aio_noop_em(bs, cb, opaque); + } + if (!drv) return NULL; return drv->bdrv_aio_flush(bs, cb, opaque); @@ -2214,6 +2224,25 @@ static BlockDriverAIOCB *bdrv_aio_flush_em(BlockDriverState *bs, return &acb->common; } +static BlockDriverAIOCB *bdrv_aio_noop_em(BlockDriverState *bs, + BlockDriverCompletionFunc *cb, void *opaque) +{ + BlockDriverAIOCBSync *acb; + + acb = qemu_aio_get(&bdrv_em_aio_pool, bs, cb, opaque); + acb->is_write = 1; /* don't bounce in the completion handler */ + acb->qiov = NULL; + acb->bounce = NULL; + acb->ret = 0; + + if (!acb->bh) { + acb->bh = qemu_bh_new(bdrv_aio_bh_cb, acb); + } + + qemu_bh_schedule(acb->bh); + return &acb->common; +} + /**************************************************************/ /* sync block device emulation */ |