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block: set sector dirty on AIO write completion
Sectors are marked dirty in the bitmap on AIO submission. This is wrong since data has not reached storage. Set a given sector as dirty in the dirty bitmap on AIO completion, so that reading a sector marked as dirty is guaranteed to return uptodate data. Reviewed-by: Kevin Wolf <kwolf@redhat.com> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
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parent
6d59fec11e
commit
4dcafbb1eb
42
block.c
42
block.c
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@ -2031,12 +2031,49 @@ BlockDriverAIOCB *bdrv_aio_readv(BlockDriverState *bs, int64_t sector_num,
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return ret;
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}
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typedef struct BlockCompleteData {
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BlockDriverCompletionFunc *cb;
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void *opaque;
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BlockDriverState *bs;
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int64_t sector_num;
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int nb_sectors;
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} BlockCompleteData;
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static void block_complete_cb(void *opaque, int ret)
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{
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BlockCompleteData *b = opaque;
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if (b->bs->dirty_bitmap) {
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set_dirty_bitmap(b->bs, b->sector_num, b->nb_sectors, 1);
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}
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b->cb(b->opaque, ret);
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qemu_free(b);
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}
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static BlockCompleteData *blk_dirty_cb_alloc(BlockDriverState *bs,
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int64_t sector_num,
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int nb_sectors,
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BlockDriverCompletionFunc *cb,
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void *opaque)
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{
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BlockCompleteData *blkdata = qemu_mallocz(sizeof(BlockCompleteData));
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blkdata->bs = bs;
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blkdata->cb = cb;
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blkdata->opaque = opaque;
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blkdata->sector_num = sector_num;
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blkdata->nb_sectors = nb_sectors;
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return blkdata;
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}
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BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
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QEMUIOVector *qiov, int nb_sectors,
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BlockDriverCompletionFunc *cb, void *opaque)
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{
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BlockDriver *drv = bs->drv;
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BlockDriverAIOCB *ret;
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BlockCompleteData *blk_cb_data;
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trace_bdrv_aio_writev(bs, sector_num, nb_sectors, opaque);
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@ -2048,7 +2085,10 @@ BlockDriverAIOCB *bdrv_aio_writev(BlockDriverState *bs, int64_t sector_num,
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return NULL;
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if (bs->dirty_bitmap) {
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set_dirty_bitmap(bs, sector_num, nb_sectors, 1);
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blk_cb_data = blk_dirty_cb_alloc(bs, sector_num, nb_sectors, cb,
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opaque);
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cb = &block_complete_cb;
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opaque = blk_cb_data;
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}
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ret = drv->bdrv_aio_writev(bs, sector_num, qiov, nb_sectors,
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