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qcow2: Options to enable discard for freed clusters

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Deleted snapshots are discarded in the image file by default, discard
requests take their default from the -drive discard=... option and other
places that free clusters must always be enabled explicitly.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Kevin Wolf 2013-06-19 13:44:19 +02:00 • committed by Stefan Hajnoczi
parent 6cfcb9b8b9
commit 67af674e47
3 changed files with 36 additions and 0 deletions
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5
block/qcow2-refcount.c
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@ -488,6 +488,11 @@ static int QEMU_WARN_UNUSED_RESULT update_refcount(BlockDriverState *bs,
s->free_cluster_index = cluster_index;
}
refcount_block[block_index] = cpu_to_be16(refcount);
if (refcount == 0 && s->discard_passthrough[type]) {
/* Try discarding, ignore errors */
/* FIXME Doing this cluster by cluster will be painfully slow */
bdrv_discard(bs->file, cluster_offset, 1);
}
}
ret = 0;