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qcow2: Add incompatibility note between backing files and raw external data files

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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>
This commit is contained in:
Alberto Garcia 2020-04-10 14:18:15 +02:00 committed by Kevin Wolf
parent 16aaacb307
commit a50c1f57e4
1 changed files with 3 additions and 0 deletions
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docs/interop/qcow2.txt
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@ -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