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block: Handle multiwrite errors only when all requests have completed 

Don't try to be clever by freeing all temporary data and calling all callbacks
when the return value (an error) is certain. Doing so has at least two
important problems:

* The temporary data that is freed (qiov, possibly zero buffer) is still used
  by the requests that have not yet completed.
* Calling the callbacks for all requests in the multiwrite means for the caller
  that it may free buffers etc. which are still in use.

Just remember the error value and do the cleanup when all requests have
completed.

Signed-off-by: Kevin Wolf <kwolf@redhat.com>
(cherry picked from commit de189a1b4a)
This commit is contained in:
Kevin Wolf 2010-07-01 16:08:51 +02:00
parent 191d44fc43
commit bb44e0bbce
1 changed files with 1 additions and 4 deletions
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5
block.c
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@ -1661,14 +1661,11 @@ static void multiwrite_cb(void *opaque, int ret)
if (ret < 0 && !mcb->error) {
mcb->error = ret;
multiwrite_user_cb(mcb);
}
mcb->num_requests--;
if (mcb->num_requests == 0) {
if (mcb->error == 0) {
multiwrite_user_cb(mcb);
}
multiwrite_user_cb(mcb);
qemu_free(mcb);
}
}