It is desirable for 'qemu-img map' to have the same output for a file
whether it is served over file or nbd protocols. However, ever since
we implemented block status for NBD (2.12), the NBD protocol forgot to
inform the block layer that as the final layer in the chain, the
offset is valid; without an offset, the human-readable form of
qemu-img map gives up with the unhelpful:
$ nbdkit -U - data data="1" size=512 --run 'qemu-img map $nbd'
Offset Length Mapped to File
qemu-img: File contains external, encrypted or compressed clusters.
The --output=json form always works, because it is reporting the
lower-level bdrv_block_status results directly rather than trying to
filter out sparse ranges for human consumption.
With this patch, the output changes to:
Offset Length Mapped to File
0 0x200 0
nbd+unix://?socket=/tmp/nbdkitOxeoLa/socket
This change is observable to several iotests.
Fixes: 78a33ab5
Reported-by: Richard W.M. Jones
Signed-off-by: Eric Blake
---
block/nbd-client.c | 9 +++--
tests/qemu-iotests/209.out | 4 ++--
tests/qemu-iotests/223.out | 18 +-
tests/qemu-iotests/241.out | 2 +-
4 files changed, 19 insertions(+), 14 deletions(-)
diff --git a/block/nbd-client.c b/block/nbd-client.c
index 150af9cc46f..3edb508f668 100644
--- a/block/nbd-client.c
+++ b/block/nbd-client.c
@@ -972,7 +972,9 @@ int coroutine_fn
nbd_client_co_block_status(BlockDriverState *bs,
if (!client->info.base_allocation) {
*pnum = bytes;
-return BDRV_BLOCK_DATA;
+*map = offset;
+*file = bs;
+return BDRV_BLOCK_DATA | BDRV_BLOCK_OFFSET_VALID;
}
ret = nbd_co_send_request(bs, , NULL);
@@ -995,8 +997,11 @@ int coroutine_fn
nbd_client_co_block_status(BlockDriverState *bs,
assert(extent.length);
*pnum = extent.length;
+*map = offset;
+*file = bs;
return (extent.flags & NBD_STATE_HOLE ? 0 : BDRV_BLOCK_DATA) |
- (extent.flags & NBD_STATE_ZERO ? BDRV_BLOCK_ZERO : 0);
+(extent.flags & NBD_STATE_ZERO ? BDRV_BLOCK_ZERO : 0) |
+BDRV_BLOCK_OFFSET_VALID;
}
void nbd_client_detach_aio_context(BlockDriverState *bs)
diff --git a/tests/qemu-iotests/209.out b/tests/qemu-iotests/209.out
index 0d29724e84a..214e27bfcec 100644
--- a/tests/qemu-iotests/209.out
+++ b/tests/qemu-iotests/209.out
@@ -1,2 +1,2 @@
-[{ "start": 0, "length": 524288, "depth": 0, "zero": false, "data": true},
-{ "start": 524288, "length": 524288, "depth": 0, "zero": true, "data": false}]
+[{ "start": 0, "length": 524288, "depth": 0, "zero": false, "data": true,
"offset": 0},
+{ "start": 524288, "length": 524288, "depth": 0, "zero": true, "data": false,
"offset": 524288}]
diff --git a/tests/qemu-iotests/223.out b/tests/qemu-iotests/223.out
index 95c40a17ad7..7828a447392 100644
--- a/tests/qemu-iotests/223.out
+++ b/tests/qemu-iotests/223.out
@@ -67,18 +67,18 @@ read 1048576/1048576 bytes at offset 1048576
1 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
read 2097152/2097152 bytes at offset 2097152
2 MiB, X ops; XX:XX:XX.X (XXX YYY/sec and XXX ops/sec)
-[{ "start": 0, "length": 4096, "depth": 0, "zero": false, "data": true},
-{ "start": 4096, "length": 1044480, "depth": 0, "zero": true, "data": false},
-{ "start": 1048576, "length": 3145728, "depth": 0, "zero": false, "data":
true}]
+[{ "start": 0, "length": 4096, "depth": 0, "zero": false, "data": true,
"offset": OFFSET},
+{ "start": 4096, "length": 1044480, "depth": 0, "zero": true, "data": false,
"offset": OFFSET},
+{ "start": 1048576, "length": 3145728, "depth": 0, "zero": false, "data":
true, "offset": OFFSET}]
[{ "start": 0, "length": 65536, "depth": 0, "zero": false, "data": false},
-{ "start": 65536, "length": 2031616, "depth": 0, "zero": false, "data": true},
+{ "start": 65536, "length": 2031616, "depth": 0, "zero": false, "data": true,
"offset": OFFSET},
{ "start": 2097152, "length": 2097152, "depth": 0, "zero": false, "data":
false}]
=== Contrast to small granularity dirty-bitmap ===
-[{ "start": 0, "length": 512, "depth": 0, "zero": false, "data": true},
+[{ "start": 0, "length": 512, "depth": 0, "zero": false, "data": true,
"offset": OFFSET},
{ "start": 512, "length": 512, "depth": 0, "zero": false, "data": false},
-{ "start": 1024, "length": 2096128, "depth": 0, "zero": false, "data": true},
+{ "start": 1024, "length": 2096128, "depth": 0, "zero": false, "data": true,
"offset": OFFSET},
{ "start": 2097152, "length": 2097152, "depth": 0, "zero": false, "data":
false}]
=== End qemu NBD server ===
@@ -94,10 +94,10 @@ read 2097152/2097152 bytes at offset 2097152
=== Use qemu-nbd as server ===
[{ "start": 0, "length": 65536, "depth": 0, "zero": false, "data": false},
-{ "start": 65536, "length": 2031616, "depth": 0, "zero": false, "data": true},
+{ "start": 65536, "length": 2031616, "depth": 0, "zero": false, "data": true,
"offset": OFFSET},
{ "start":
