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Re: [Qemu-devel] [PATCH for-1.4] block/raw-posix: Build fix for O_ASYNC
From: |
Stefan Hajnoczi |
Subject: |
Re: [Qemu-devel] [PATCH for-1.4] block/raw-posix: Build fix for O_ASYNC |
Date: |
Mon, 28 Jan 2013 13:27:42 +0100 |
User-agent: |
Mutt/1.5.21 (2010-09-15) |
On Mon, Jan 28, 2013 at 10:47:28AM +0100, Paolo Bonzini wrote:
> Il 26/01/2013 14:38, Andreas Färber ha scritto:
> > Commit eeb6b45d48800e96f67ef2a5c80332557fd45ddb (block: raw-posix image
> > file reopen) broke the build on OpenIndiana.
> >
> > illumos has no O_ASYNC. Exclude it from flags to be compared and
> > use I_SETSIG ioctl after newly opening file.
> >
> > Cf. e61ab1da7e98357da47c54d8f893b9bd6ff2f7f9 for qemu-ga.
> >
> > Cc: address@hidden (1.3.x)
> > Cc: Jeff Cody <address@hidden>
> > Signed-off-by: Andreas Färber <address@hidden>
> > ---
> > block/raw-posix.c | 14 +++++++++++++-
> > 1 Datei geändert, 13 Zeilen hinzugefügt(+), 1 Zeile entfernt(-)
> >
> > diff --git a/block/raw-posix.c b/block/raw-posix.c
> > index 657af95..336c938 100644
> > --- a/block/raw-posix.c
> > +++ b/block/raw-posix.c
> > @@ -46,6 +46,7 @@
> > #ifdef __sun__
> > #define _POSIX_PTHREAD_SEMANTICS 1
> > #include <sys/dkio.h>
> > +#include <stropts.h>
> > #endif
> > #ifdef __linux__
> > #include <sys/types.h>
> > @@ -345,7 +346,10 @@ static int raw_reopen_prepare(BDRVReopenState *state,
> >
> > raw_s->fd = -1;
> >
> > - int fcntl_flags = O_APPEND | O_ASYNC | O_NONBLOCK;
> > + int fcntl_flags = O_APPEND | O_NONBLOCK;
> > +#ifndef CONFIG_SOLARIS
> > + fcntl_flags |= O_ASYNC;
> > +#endif
> > #ifdef O_NOATIME
> > fcntl_flags |= O_NOATIME;
> > #endif
> > @@ -376,6 +380,14 @@ static int raw_reopen_prepare(BDRVReopenState *state,
> > raw_s->fd = qemu_open(state->bs->filename, raw_s->open_flags);
> > if (raw_s->fd == -1) {
> > ret = -1;
> > + } else {
> > +#ifdef CONFIG_SOLARIS
> > + ret = ioctl(raw_s->fd, I_SETSIG, S_OUTPUT | S_INPUT | S_HIPRI);
> > + if (ret == -1) {
> > + qemu_close(raw_s->fd);
> > + raw_s->fd = -1;
> > + }
> > +#endif
>
> The flag is not set unconditionally. It is only set if it was in
> s->open_flags, and it should never be.
>
> I would just add an
>
> #ifdef O_ASYNC
> /* Not all operating systems have O_ASYNC, and those that don't
> * will not let us track the state into raw_s->open_flags (typically
> * you achieve the same effect with an ioctl, for example I_SETSIG
> * on Solaris). But we do not use O_ASYNC, so that's fine.
> */
> assert((s->open_flags & O_ASYNC) == 0);
> #endif
Good point.
Andreas: Do you want to send a new patch?
Stefan