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qcow2: No persistent dirty bitmaps for compat=0.10

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Persistent dirty bitmaps require a properly functioning
autoclear_features field, or we cannot track when an unsupporting
program might overwrite them.  Therefore, we cannot support them for
compat=0.10 images.

Signed-off-by: Max Reitz <mreitz@redhat.com>
Message-id: 20171123020832.8165-3-mreitz@redhat.com
Reviewed-by: Eric Blake <eblake@redhat.com>
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Max Reitz 2017-11-23 03:08:17 +01:00
parent 3c363575dc
commit c9ceb3ec8a
2 changed files with 21 additions and 3 deletions
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14
block/qcow2.c
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@ -302,9 +302,17 @@ static int qcow2_read_extensions(BlockDriverState *bs, uint64_t start_offset,
}
if (!(s->autoclear_features & QCOW2_AUTOCLEAR_BITMAPS)) {
warn_report("a program lacking bitmap support "
"modified this file, so all bitmaps are now "
"considered inconsistent");
if (s->qcow_version < 3) {
/* Let's be a bit more specific */
warn_report("This qcow2 v2 image contains bitmaps, but "
"they may have been modified by a program "
"without persistent bitmap support; so now "
"they must all be considered inconsistent");
} else {
warn_report("a program lacking bitmap support "
"modified this file, so all bitmaps are now "
"considered inconsistent");
}
error_printf("Some clusters may be leaked, "
"run 'qemu-img check -r' on the image "
"file to fix.");