raw: Support BDRV_REQ_FUA

Pass through the FUA flag to the lower layer so that the separate flush
can be saved in practically relevant cases where a (raw) format driver
sits on top of the protocol driver.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: Max Reitz <mreitz@redhat.com>

diff --git a/block/raw_bsd.c b/block/raw_bsd.c
index 41dddf8..a6cc7e9 100644 (file)
--- a/block/raw_bsd.c
+++ b/block/raw_bsd.c
@@ -57,8 +57,9 @@ static int coroutine_fn raw_co_readv(BlockDriverState *bs, int64_t sector_num,
     return bdrv_co_readv(bs->file->bs, sector_num, nb_sectors, qiov);
 }
 
-static int coroutine_fn raw_co_writev(BlockDriverState *bs, int64_t sector_num,
-                                      int nb_sectors, QEMUIOVector *qiov)
+static int coroutine_fn
+raw_co_writev_flags(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
+                    QEMUIOVector *qiov, int flags)
 {
     void *buf = NULL;
     BlockDriver *drv;
@@ -104,7 +105,8 @@ static int coroutine_fn raw_co_writev(BlockDriverState *bs, int64_t sector_num,
     }
 
     BLKDBG_EVENT(bs->file, BLKDBG_WRITE_AIO);
-    ret = bdrv_co_writev(bs->file->bs, sector_num, nb_sectors, qiov);
+    ret = bdrv_co_do_pwritev(bs->file->bs, sector_num * BDRV_SECTOR_SIZE,
+                             nb_sectors * BDRV_SECTOR_SIZE, qiov, flags);
 
 fail:
     if (qiov == &local_qiov) {
@@ -114,6 +116,13 @@ fail:
     return ret;
 }
 
+static int coroutine_fn
+raw_co_writev(BlockDriverState *bs, int64_t sector_num, int nb_sectors,
+              QEMUIOVector *qiov)
+{
+    return raw_co_writev_flags(bs, sector_num, nb_sectors, qiov, 0);
+}
+
 static int64_t coroutine_fn raw_co_get_block_status(BlockDriverState *bs,
                                             int64_t sector_num,
                                             int nb_sectors, int *pnum,
@@ -248,6 +257,8 @@ BlockDriver bdrv_raw = {
     .bdrv_create          = &raw_create,
     .bdrv_co_readv        = &raw_co_readv,
     .bdrv_co_writev       = &raw_co_writev,
+    .bdrv_co_writev_flags = &raw_co_writev_flags,
+    .supported_write_flags = BDRV_REQ_FUA,
     .bdrv_co_write_zeroes = &raw_co_write_zeroes,
     .bdrv_co_discard      = &raw_co_discard,
     .bdrv_co_get_block_status = &raw_co_get_block_status,