Putting zoned/non-zoned BlockDrivers on top of each other is not
allowed.
Signed-off-by: Sam Li <faithilike...@gmail.com>
Reviewed-by: Stefan Hajnoczi <stefa...@redhat.com>
---
block.c | 17 +++++++++++++++++
block/file-posix.c | 13 +++++++++++++
block/raw-format.c | 1 +
include/block/block_int-common.h | 5 +++++
4 files changed, 36 insertions(+)
mode change 100644 => 100755 block.c
mode change 100644 => 100755 block/file-posix.c
diff --git a/block.c b/block.c
old mode 100644
new mode 100755
index bc85f46eed..bf2f2918e7
--- a/block.c
+++ b/block.c
@@ -7947,6 +7947,23 @@ void bdrv_add_child(BlockDriverState *parent_bs,
BlockDriverState *child_bs,
return;
}
+ /*
+ * Non-zoned block drivers do not follow zoned storage constraints
+ * (i.e. sequential writes to zones). Refuse mixing zoned and non-zoned
+ * drivers in a graph.
+ */
+ if (!parent_bs->drv->supports_zoned_children &&
+ /* The host-aware model allows zoned storage constraints and random
+ * write. Allow mixing host-aware and non-zoned drivers. Using
+ * host-aware device as a regular device. */
+ child_bs->bl.zoned == BLK_Z_HM) {
+ error_setg(errp, "Cannot add a %s child to a %s parent",
+ child_bs->bl.zoned == BLK_Z_HM ? "zoned" : "non-zoned",
+ parent_bs->drv->supports_zoned_children ?
+ "support zoned children" : "not support zoned children");
+ return;
+ }
+
if (!QLIST_EMPTY(&child_bs->parents)) {
error_setg(errp, "The node %s already has a parent",
child_bs->node_name);
diff --git a/block/file-posix.c b/block/file-posix.c
old mode 100644
new mode 100755
index 0a6c781201..73656d87f2
--- a/block/file-posix.c
+++ b/block/file-posix.c
@@ -779,6 +779,19 @@ static int raw_open_common(BlockDriverState *bs, QDict
*options,
goto fail;
}
}
+#ifdef CONFIG_BLKZONED
+ /*
+ * The kernel page cache does not reliably work for writes to SWR zones
+ * of zoned block device because it can not guarantee the order of writes.
+ */
+ if (strcmp(bs->drv->format_name, "zoned_host_device") == 0) {
+ if (!(s->open_flags & O_DIRECT)) {
+ error_setg(errp, "driver=zoned_host_device was specified, but it "
+ "requires cache.direct=on, which was not
specified.");
+ return -EINVAL; /* No host kernel page cache */
+ }
+ }
+#endif
if (S_ISBLK(st.st_mode)) {
#ifdef BLKDISCARDZEROES
diff --git a/block/raw-format.c b/block/raw-format.c
index 6b20bd22ef..9441536819 100644
--- a/block/raw-format.c
+++ b/block/raw-format.c
@@ -614,6 +614,7 @@ static void raw_child_perm(BlockDriverState *bs, BdrvChild
*c,
BlockDriver bdrv_raw = {
.format_name = "raw",
.instance_size = sizeof(BDRVRawState),
+ .supports_zoned_children = true,
.bdrv_probe = &raw_probe,
.bdrv_reopen_prepare = &raw_reopen_prepare,
.bdrv_reopen_commit = &raw_reopen_commit,
diff --git a/include/block/block_int-common.h b/include/block/block_int-common.h
index cdc06e77a6..37dddc603c 100644
--- a/include/block/block_int-common.h
+++ b/include/block/block_int-common.h
@@ -127,6 +127,11 @@ struct BlockDriver {
*/
bool is_format;
+ /*
+ * Set to true if the BlockDriver supports zoned children.
+ */
+ bool supports_zoned_children;
+
/*
* Drivers not implementing bdrv_parse_filename nor bdrv_open should have
* this field set to true, except ones that are defined only by their
--
2.37.3
