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Diffstat (limited to 'block/io.c')
-rw-r--r--block/io.c18
1 files changed, 12 insertions, 6 deletions
diff --git a/block/io.c b/block/io.c
index 17a243cde9..56bbf195bb 100644
--- a/block/io.c
+++ b/block/io.c
@@ -1168,7 +1168,8 @@ bdrv_driver_pwritev_compressed(BlockDriverState *bs, uint64_t offset,
}
static int coroutine_fn bdrv_co_do_copy_on_readv(BdrvChild *child,
- int64_t offset, unsigned int bytes, QEMUIOVector *qiov)
+ int64_t offset, unsigned int bytes, QEMUIOVector *qiov,
+ int flags)
{
BlockDriverState *bs = child->bs;
@@ -1279,9 +1280,11 @@ static int coroutine_fn bdrv_co_do_copy_on_readv(BdrvChild *child,
goto err;
}
- qemu_iovec_from_buf(qiov, progress, bounce_buffer + skip_bytes,
- pnum - skip_bytes);
- } else {
+ if (!(flags & BDRV_REQ_PREFETCH)) {
+ qemu_iovec_from_buf(qiov, progress, bounce_buffer + skip_bytes,
+ pnum - skip_bytes);
+ }
+ } else if (!(flags & BDRV_REQ_PREFETCH)) {
/* Read directly into the destination */
qemu_iovec_init(&local_qiov, qiov->niov);
qemu_iovec_concat(&local_qiov, qiov, progress, pnum - skip_bytes);
@@ -1332,7 +1335,8 @@ static int coroutine_fn bdrv_aligned_preadv(BdrvChild *child,
* potential fallback support, if we ever implement any read flags
* to pass through to drivers. For now, there aren't any
* passthrough flags. */
- assert(!(flags & ~(BDRV_REQ_NO_SERIALISING | BDRV_REQ_COPY_ON_READ)));
+ assert(!(flags & ~(BDRV_REQ_NO_SERIALISING | BDRV_REQ_COPY_ON_READ |
+ BDRV_REQ_PREFETCH)));
/* Handle Copy on Read and associated serialisation */
if (flags & BDRV_REQ_COPY_ON_READ) {
@@ -1360,7 +1364,9 @@ static int coroutine_fn bdrv_aligned_preadv(BdrvChild *child,
}
if (!ret || pnum != bytes) {
- ret = bdrv_co_do_copy_on_readv(child, offset, bytes, qiov);
+ ret = bdrv_co_do_copy_on_readv(child, offset, bytes, qiov, flags);
+ goto out;
+ } else if (flags & BDRV_REQ_PREFETCH) {
goto out;
}
}