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block: Add blkdebug hook for copy-on-read

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Make it possible to inject errors on writes performed during a
read operation due to copy-on-read semantics.

Signed-off-by: Eric Blake <eblake@redhat.com>
Reviewed-by: Jeff Cody <jcody@redhat.com>
Reviewed-by: Kevin Wolf <kwolf@redhat.com>
Reviewed-by: John Snow <jsnow@redhat.com>
Reviewed-by: Stefan Hajnoczi <stefanha@redhat.com>
Signed-off-by: Kevin Wolf <kwolf@redhat.com>
This commit is contained in:
Eric Blake 2017-10-05 14:02:46 -05:00 • committed by Kevin Wolf
parent 8803714b53
commit d855ebcd3c
2 changed files with 5 additions and 1 deletions
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block/io.c
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@ -983,6 +983,7 @@ static int coroutine_fn bdrv_co_do_copy_on_readv(BdrvChild *child,
goto err;
}
bdrv_debug_event(bs, BLKDBG_COR_WRITE);
if (drv->bdrv_co_pwrite_zeroes &&
buffer_is_zero(bounce_buffer, iov.iov_len)) {
/* FIXME: Should we (perhaps conditionally) be setting