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[PATCH v3 1/2] block: add BDRV_BLOCK_COMPRESSED flag for bdrv_block_stat
From: |
Andrey Drobyshev |
Subject: |
[PATCH v3 1/2] block: add BDRV_BLOCK_COMPRESSED flag for bdrv_block_status() |
Date: |
Fri, 8 Sep 2023 00:02:25 +0300 |
Functions qcow2_get_host_offset(), get_cluster_offset(),
vmdk_co_block_status() explicitly report compressed cluster types when data
is compressed. However, this information is never passed further. Let's
make use of it by adding new BDRV_BLOCK_COMPRESSED flag for
bdrv_block_status(), so that caller may know that the data range is
compressed. In particular, we're going to use this flag to tweak
"qemu-img map" output.
This new flag is only being utilized by qcow, qcow2 and vmdk formats, as only
those support compression.
Reviewed-by: Denis V. Lunev <den@openvz.org>
Reviewed-by: Hanna Czenczek <hreitz@redhat.com>
Signed-off-by: Andrey Drobyshev <andrey.drobyshev@virtuozzo.com>
---
block/qcow.c | 5 ++++-
block/qcow2.c | 3 +++
block/vmdk.c | 2 ++
include/block/block-common.h | 3 +++
4 files changed, 12 insertions(+), 1 deletion(-)
diff --git a/block/qcow.c b/block/qcow.c
index 577bd70324..d56d24ab6d 100644
--- a/block/qcow.c
+++ b/block/qcow.c
@@ -549,7 +549,10 @@ qcow_co_block_status(BlockDriverState *bs, bool want_zero,
if (!cluster_offset) {
return 0;
}
- if ((cluster_offset & QCOW_OFLAG_COMPRESSED) || s->crypto) {
+ if (cluster_offset & QCOW_OFLAG_COMPRESSED) {
+ return BDRV_BLOCK_DATA | BDRV_BLOCK_COMPRESSED;
+ }
+ if (s->crypto) {
return BDRV_BLOCK_DATA;
}
*map = cluster_offset | index_in_cluster;
diff --git a/block/qcow2.c b/block/qcow2.c
index b48cd9ce63..b81dc5066b 100644
--- a/block/qcow2.c
+++ b/block/qcow2.c
@@ -2162,6 +2162,9 @@ qcow2_co_block_status(BlockDriverState *bs, bool
want_zero, int64_t offset,
{
status |= BDRV_BLOCK_RECURSE;
}
+ if (type == QCOW2_SUBCLUSTER_COMPRESSED) {
+ status |= BDRV_BLOCK_COMPRESSED;
+ }
return status;
}
diff --git a/block/vmdk.c b/block/vmdk.c
index 70066c2b01..56b3d5151d 100644
--- a/block/vmdk.c
+++ b/block/vmdk.c
@@ -1770,6 +1770,8 @@ vmdk_co_block_status(BlockDriverState *bs, bool want_zero,
if (extent->flat) {
ret |= BDRV_BLOCK_RECURSE;
}
+ } else {
+ ret |= BDRV_BLOCK_COMPRESSED;
}
*file = extent->file->bs;
break;
diff --git a/include/block/block-common.h b/include/block/block-common.h
index df5ffc8d09..5b5ae07c93 100644
--- a/include/block/block-common.h
+++ b/include/block/block-common.h
@@ -287,6 +287,8 @@ typedef enum {
* layer rather than any backing, set by block layer
* BDRV_BLOCK_EOF: the returned pnum covers through end of file for this
* layer, set by block layer
+ * BDRV_BLOCK_COMPRESSED: the underlying data is compressed; only valid for
+ * the formats supporting compression: qcow, qcow2
*
* Internal flags:
* BDRV_BLOCK_RAW: for use by passthrough drivers, such as raw, to request
@@ -322,6 +324,7 @@ typedef enum {
#define BDRV_BLOCK_ALLOCATED 0x10
#define BDRV_BLOCK_EOF 0x20
#define BDRV_BLOCK_RECURSE 0x40
+#define BDRV_BLOCK_COMPRESSED 0x80
typedef QTAILQ_HEAD(BlockReopenQueue, BlockReopenQueueEntry) BlockReopenQueue;
--
2.39.3