[Libguestfs] [PATCH nbdkit 2/2] Add new retry filter.

[Eric Blake]

On 9/19/19 6:37 AM, Richard W.M. Jones wrote:
> On Thu, Sep 19, 2019 at 12:34:17PM +0100, Richard W.M. Jones wrote:
>> diff --git a/server/backend.c b/server/backend.c
>> index 8a434bd..b8c5742 100644
>> --- a/server/backend.c
>> +++ b/server/backend.c
>> @@ -224,9 +224,17 @@ backend_valid_range (struct backend *b, struct connection *conn,
>>  int
>>  backend_reopen (struct backend *b, struct connection *conn, int readonly)
>>  {
>> +  struct b_conn_handle *h = &conn->handles[b->i];
>> +
>>    debug ("%s: reopen", b->name);
>>  
>>    b->close (b, conn);
>> +
>> +  /* This forces .open to recalculate h->can_write, which might have
>> +   * changed since we may have a new readonly value.
>> +   */
>> +  h->can_write = -1;

We probably ought to reset ALL of the h->can_* cached values.  If
h->can_write changes, that also impacts h->can_zero and friends.

>> +
>>    return backend_open (b, conn, readonly);
>>  }
> 
> Obviously this hunk should be in the first patch ...
> 
> Rich.
> 

-- 
Eric Blake, Principal Software Engineer
Red Hat, Inc.           +1-919-301-3226
Virtualization:  qemu.org | libvirt.org

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