diff options
| author | Peter Maydell <peter.maydell@linaro.org> | 2020-04-30 19:25:41 +0100 |
|---|---|---|
| committer | Peter Maydell <peter.maydell@linaro.org> | 2020-04-30 19:25:41 +0100 |
| commit | 1c47613588ccff44422d4bdeea0dc36a0a308ec7 (patch) | |
| tree | 59445b7ac2c530df4a926ffeb312c724025196f0 /docs | |
| parent | 27c94566379069fb8930bb1433dcffbf7df3203d (diff) | |
| parent | eaae29ef89d498d0eac553c77b554f310a47f809 (diff) | |
Merge remote-tracking branch 'remotes/kevin/tags/for-upstream' into staging
Block layer patches:
- Fix resize (extending) of short overlays
- nvme: introduce PMR support from NVMe 1.4 spec
- qemu-storage-daemon: Fix non-string --object properties
# gpg: Signature made Thu 30 Apr 2020 16:51:45 BST
# gpg: using RSA key DC3DEB159A9AF95D3D7456FE7F09B272C88F2FD6
# gpg: issuer "kwolf@redhat.com"
# gpg: Good signature from "Kevin Wolf <kwolf@redhat.com>" [full]
# Primary key fingerprint: DC3D EB15 9A9A F95D 3D74 56FE 7F09 B272 C88F 2FD6
* remotes/kevin/tags/for-upstream:
qemu-storage-daemon: Fix non-string --object properties
qom: Factor out user_creatable_add_dict()
nvme: introduce PMR support from NVMe 1.4 spec
qcow2: Forward ZERO_WRITE flag for full preallocation
iotests: Test committing to short backing file
iotests: Filter testfiles out in filter_img_info()
block: truncate: Don't make backing file data visible
file-posix: Support BDRV_REQ_ZERO_WRITE for truncate
raw-format: Support BDRV_REQ_ZERO_WRITE for truncate
qcow2: Support BDRV_REQ_ZERO_WRITE for truncate
block-backend: Add flags to blk_truncate()
block: Add flags to bdrv(_co)_truncate()
block: Add flags to BlockDriver.bdrv_co_truncate()
qemu-iotests: allow qcow2 external discarded clusters to contain stale data
qcow2: Add incompatibility note between backing files and raw external data files
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/interop/qcow2.txt | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/docs/interop/qcow2.txt b/docs/interop/qcow2.txt index 640e0eca40..298a031310 100644 --- a/docs/interop/qcow2.txt +++ b/docs/interop/qcow2.txt @@ -25,6 +25,9 @@ The first cluster of a qcow2 image contains the file header: is stored (NB: The string is not null terminated). 0 if the image doesn't have a backing file. + Note: backing files are incompatible with raw external data + files (auto-clear feature bit 1). + 16 - 19: backing_file_size Length of the backing file name in bytes. Must not be longer than 1023 bytes. Undefined if the image doesn't have |