I stumbled upon this when looking at external bitmap formats.
Current "qemu-img map" command only displays filename if the data is allocated
in bs (bs->file) itself, or in the backing chain. Otherwise, it displays an
unfriendly error message:
$ qemu-img create -f vmdk -o subformat=monolithicFlat /tmp/test.vmdk 1G
$ qemu-img map /tmp/test.vmdk
Offset Length Mapped to File
qemu-img: File contains external, encrypted or compressed clusters.
This can be improved. This series extends the .bdrv_co_get_block_status
callback, to let block driver return the BDS of file; then updates all driver
to implement it; and lastly, it changes qemu-img to use this information in
"map" command:
$ qemu-img map /tmp/test.vmdk
Offset Length Mapped to File
0 0x40000000 0 /tmp/test-flat.vmdk
$ qemu-img map --output json /tmp/test.vmdk
[{"length": 1073741824, "start": 0, "zero": false, "offset": 0, "depth": 0,
"file": "/tmp/test-flat.vmdk", "data": true}
]
Fam Zheng (14):
block: Add "file" output parameter to block status query functions
qcow: Assign bs->file->bs to file in qcow_co_get_block_status
qcow2: Assign bs->file->bs to file in qcow2_co_get_block_status
raw: Assign bs to file in raw_co_get_block_status
iscsi: Assign bs to file in iscsi_co_get_block_status
parallels: Assign bs->file->bs to file in
parallels_co_get_block_status
qed: Assign bs->file->bs to file in bdrv_qed_co_get_block_status
sheepdog: Assign bs to file in sd_co_get_block_status
vdi: Assign bs->file->bs to file in vdi_co_get_block_status
vpc: Assign bs->file->bs to file in vpc_co_get_block_status
vmdk: Return extent's file in bdrv_get_block_status
qemu-img: In 'map', use QDict to generate JSON output
qemu-img: In "map" output, support external file name
iotests: Add "qemu-img map" test for VMDK extents
block/io.c | 42 +++++++++++++-------
block/iscsi.c | 9 ++++-
block/mirror.c | 3 +-
block/parallels.c | 3 +-
block/qcow.c | 3 +-
block/qcow2.c | 3 +-
block/qed.c | 6 ++-
block/raw-posix.c | 4 +-
block/raw_bsd.c | 4 +-
block/sheepdog.c | 5 ++-
block/vdi.c | 3 +-
block/vmdk.c | 13 +++----
block/vpc.c | 4 +-
block/vvfat.c | 2 +-
include/block/block.h | 6 ++-
include/block/block_int.h | 3 +-
qemu-img.c | 49 ++++++++++++++++-------
tests/qemu-iotests/059 | 10 +++++
tests/qemu-iotests/059.out | 38 ++++++++++++++++++
tests/qemu-iotests/122.out | 96 ++++++++++++++++++++++++++--------------------
20 files changed, 213 insertions(+), 93 deletions(-)
--
2.4.3
