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[PATCH v7 6/8] config: add check to block layer
From: |
Sam Li |
Subject: |
[PATCH v7 6/8] config: add check to block layer |
Date: |
Tue, 16 Aug 2022 14:25:20 +0800 |
Putting zoned/non-zoned BlockDrivers on top of each other is not
allowed.
Signed-off-by: Sam Li <faithilikerun@gmail.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
---
block.c | 14 ++++++++++++++
block/raw-format.c | 1 +
include/block/block_int-common.h | 5 +++++
3 files changed, 20 insertions(+)
diff --git a/block.c b/block.c
index bc85f46eed..affe6c597e 100644
--- a/block.c
+++ b/block.c
@@ -7947,6 +7947,20 @@ 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 &&
+ 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/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 de44c7b6f4..4c44592b59 100644
--- a/include/block/block_int-common.h
+++ b/include/block/block_int-common.h
@@ -126,6 +126,11 @@ 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
--
2.37.1
- Re: [PATCH v7 3/8] file-posix: introduce get_sysfs_long_val for the long sysfs attribute, (continued)
[PATCH v7 4/8] block: add block layer APIs resembling Linux ZonedBlockDevice ioctls, Sam Li, 2022/08/16
[PATCH v7 5/8] raw-format: add zone operations to pass through requests, Sam Li, 2022/08/16
[PATCH v7 6/8] config: add check to block layer,
Sam Li <=
[PATCH v7 7/8] qemu-iotests: test new zone operations, Sam Li, 2022/08/16
[PATCH v7 8/8] docs/zoned-storage: add zoned device documentation, Sam Li, 2022/08/16