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block/block-copy: fix s->copy_size for compressed cluster 

0e2402452f allowed writes larger than cluster, but that's
unsupported for compressed write. Fix it.

Fixes: 0e2402452f
Signed-off-by: Vladimir Sementsov-Ogievskiy <vsementsov@virtuozzo.com>
Message-id: 20191029150934.26416-1-vsementsov@virtuozzo.com
Signed-off-by: Max Reitz <mreitz@redhat.com>
This commit is contained in:
Vladimir Sementsov-Ogievskiy 2019-10-29 18:09:34 +03:00 committed by Max Reitz
parent 407d22eb5b
commit dcfbece684
1 changed files with 2 additions and 2 deletions
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4
block/block-copy.c
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@ -109,9 +109,9 @@ BlockCopyState *block_copy_state_new(BdrvChild *source, BdrvChild *target,
s->use_copy_range = false;
s->copy_size = cluster_size;
} else if (write_flags & BDRV_REQ_WRITE_COMPRESSED) {
/* Compression is not supported for copy_range */
/* Compression supports only cluster-size writes and no copy-range. */
s->use_copy_range = false;
s->copy_size = MAX(cluster_size, BLOCK_COPY_MAX_BUFFER);
s->copy_size = cluster_size;
} else {
/*
* copy_range does not respect max_transfer (it's a TODO), so we factor