Re: [PATCH v2 3/4] qemu-io: add -r option to register I/O buffer

[Stefan Hajnoczi <stefanha@redhat.com>]

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On Tue, Jan 31, 2023 at 03:23:24PM -0600, Eric Blake wrote:
> On Mon, Jan 30, 2023 at 04:54:14PM -0500, Stefan Hajnoczi wrote:
> > The blk_register_buf() API is an optimization hint that allows some
> > block drivers to avoid I/O buffer housekeeping or bounce buffers.
> > 
> > Add an -r option to register the I/O buffer so that qemu-io can be used
> > to test the blk_register_buf() API. The next commit will add a test that
> > uses the new option.
> > 
> > Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
> > ---
> >  qemu-io-cmds.c | 167 +++++++++++++++++++++++++++++++++----------------
> >  1 file changed, 114 insertions(+), 53 deletions(-)
> 
> Reviewed-by: Eric Blake <eblake@redhat.com>
> 
> > @@ -1277,7 +1322,7 @@ static int writev_f(BlockBackend *blk, int argc, char **argv)
> >      int pattern = 0xcd;
> >      QEMUIOVector qiov;
> >  
> > -    while ((c = getopt(argc, argv, "CfqP:")) != -1) {
> > +    while ((c = getopt(argc, argv, "CfqrP:")) != -1) {
> 
> This one is still odd - it is neither case-sensitive nor
> case-insensitive in order, because of P: coming after qr.
> 
> > @@ -1476,7 +1529,7 @@ static int aio_read_f(BlockBackend *blk, int argc, char **argv)
> >      struct aio_ctx *ctx = g_new0(struct aio_ctx, 1);
> >  
> >      ctx->blk = blk;
> > -    while ((c = getopt(argc, argv, "CP:iqv")) != -1) {
> > +    while ((c = getopt(argc, argv, "CP:iqrv")) != -1) {
> 
> This one could at least argue that all capitals are before any
> lower-case, although case-insensitive would put i before P:.
> 
> > @@ -1582,22 +1641,24 @@ static int aio_write_f(BlockBackend *blk, int argc, char **argv)
> >      int nr_iov, c;
> >      int pattern = 0xcd;
> >      struct aio_ctx *ctx = g_new0(struct aio_ctx, 1);
> > -    BdrvRequestFlags flags = 0;
> >  
> >      ctx->blk = blk;
> > -    while ((c = getopt(argc, argv, "CfiqP:uz")) != -1) {
> > +    while ((c = getopt(argc, argv, "CfiqrP:uz")) != -1) {
> 
> Another odd spot where P: would fit better before qr.
> 
> Those are still minor, so I don't care if you further touch them
> up. My R-b applies either way.

Ah, I only paid attention to the user-visible help strings. I'll fix up
the getopt strings.

Stefan

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