diff options
| author | Alberto Garcia <berto@igalia.com> | 2020-04-10 14:18:15 +0200 |
|---|---|---|
| committer | Kevin Wolf <kwolf@redhat.com> | 2020-04-30 17:51:06 +0200 |
| commit | a50c1f57e491ba17c0fcb7d285dfe04770be0a70 (patch) | |
| tree | 4b523b49b48f8140122e6c7eb30d974956013e36 | |
| parent | 16aaacb307ed607b9780c12702c44f0fe52edc7e (diff) | |
| download | focaccia-qemu-a50c1f57e491ba17c0fcb7d285dfe04770be0a70.tar.gz focaccia-qemu-a50c1f57e491ba17c0fcb7d285dfe04770be0a70.zip | |
qcow2: Add incompatibility note between backing files and raw external data files
Backing files and raw external data files are mutually exclusive. The documentation of the raw external data bit (in autoclear_features) already indicates that, but we should also mention it on the other side. Suggested-by: Eric Blake <eblake@redhat.com> Signed-off-by: Alberto Garcia <berto@igalia.com> Message-Id: <20200410121816.8334-1-berto@igalia.com> Reviewed-by: Eric Blake <eblake@redhat.com> Signed-off-by: Kevin Wolf <kwolf@redhat.com>
| -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 |