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block: Add BlockDriver.bdrv_check_ext_snapshot.

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This field is used by blkverify to disable external snapshots creation.
It will also be used by block filters like quorum to disable external
snapshot creation.

Signed-off-by: Benoit Canet <benoit@irqsave.net>
Reviewed-by: Max Reitz <mreitz@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Benoît Canet 2013-10-02 14:33:48 +02:00 • committed by Kevin Wolf
parent 92bc50a5ad
commit f6186f49e2
5 changed files with 46 additions and 0 deletions
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19
block.c
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@ -4647,3 +4647,22 @@ int bdrv_amend_options(BlockDriverState *bs, QEMUOptionParameter *options)
}
return bs->drv->bdrv_amend_options(bs, options);
}
ExtSnapshotPerm bdrv_check_ext_snapshot(BlockDriverState *bs)
{
if (bs->drv->bdrv_check_ext_snapshot) {
return bs->drv->bdrv_check_ext_snapshot(bs);
}
if (bs->file && bs->file->drv && bs->file->drv->bdrv_check_ext_snapshot) {
return bs->file->drv->bdrv_check_ext_snapshot(bs);
}
/* external snapshots are allowed by default */
return EXT_SNAPSHOT_ALLOWED;
}
ExtSnapshotPerm bdrv_check_ext_snapshot_forbidden(BlockDriverState *bs)
{
return EXT_SNAPSHOT_FORBIDDEN;
}