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[PATCH v12 5/7] config: add check to block layer
From: |
Sam Li |
Subject: |
[PATCH v12 5/7] config: add check to block layer |
Date: |
Sun, 16 Oct 2022 22:51:08 +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>
Reviewed-by: Hannes Reinecke <hare@suse.de>
---
block.c | 19 +++++++++++++++++++
block/file-posix.c | 12 ++++++++++++
block/raw-format.c | 1 +
include/block/block_int-common.h | 5 +++++
4 files changed, 37 insertions(+)
diff --git a/block.c b/block.c
index 1fbf6b9e69..5d6fa4a25a 100644
--- a/block.c
+++ b/block.c
@@ -7951,6 +7951,25 @@ 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) {
+ /*
+ * 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.
+ */
+ 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
index bd28e3eaea..7c5a330fc1 100644
--- a/block/file-posix.c
+++ b/block/file-posix.c
@@ -776,6 +776,18 @@ 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) &&
+ (!(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 __linux__
diff --git a/block/raw-format.c b/block/raw-format.c
index bac43f1d25..18dc52a150 100644
--- a/block/raw-format.c
+++ b/block/raw-format.c
@@ -615,6 +615,7 @@ 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
- Re: [PATCH v12 1/7] include: add zoned device structs, (continued)
- [PATCH v12 2/7] file-posix: introduce helper functions for sysfs attributes, Sam Li, 2022/10/16
- [PATCH v12 3/7] block: add block layer APIs resembling Linux ZonedBlockDevice ioctls, Sam Li, 2022/10/16
- [PATCH v12 5/7] config: add check to block layer,
Sam Li <=
- [PATCH v12 4/7] raw-format: add zone operations to pass through requests, Sam Li, 2022/10/16
- [PATCH v12 7/7] docs/zoned-storage: add zoned device documentation, Sam Li, 2022/10/16
- [PATCH v12 6/7] qemu-iotests: test new zone operations, Sam Li, 2022/10/16