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Re: [Qemu-block] [PATCH v3] block/gluster: Handle changed glfs_ftruncate
From: |
Jeff Cody |
Subject: |
Re: [Qemu-block] [PATCH v3] block/gluster: Handle changed glfs_ftruncate signature |
Date: |
Sat, 28 Jul 2018 00:18:39 -0400 |
User-agent: |
Mutt/1.5.24 (2015-08-30) |
On Fri, Jul 27, 2018 at 08:24:05AM -0500, Eric Blake wrote:
> On 07/27/2018 03:19 AM, Niels de Vos wrote:
> >From: Prasanna Kumar Kalever <address@hidden>
> >
> >New versions of Glusters libgfapi.so have an updated glfs_ftruncate()
> >function that returns additional 'struct stat' structures to enable
> >advanced caching of attributes. This is useful for file servers, not so
> >much for QEMU. Nevertheless, the API has changed and needs to be
> >adopted.
> >
>
> Oh, one other comment.
>
> >+++ b/block/gluster.c
> >@@ -20,6 +20,10 @@
> > #include "qemu/option.h"
> > #include "qemu/cutils.h"
> >+#ifdef CONFIG_GLUSTERFS_LEGACY_FTRUNCATE
> >+# define glfs_ftruncate(fd, offset, _u1, _u2) glfs_ftruncate(fd, offset)
> >+#endif
>
> Someday, when we can assume new enough gluster everywhere, we can drop this
> hunk...
>
Part of me wishes that libgfapi had just created a new function
'glfs_ftruncate2', so that existing users don't need to handle the api
change. But I guess in the grand scheme, not a huge deal either way.
> >+++ b/configure
>
> >+ /* new glfs_ftruncate() passes two additional args */
> >+ return glfs_ftruncate(NULL, 0 /*, NULL, NULL */);
> >+}
> >+EOF
> >+ if compile_prog "$glusterfs_cflags" "$glusterfs_libs" ; then
> >+ glusterfs_legacy_ftruncate="yes"
> >+ fi
>
> ...but it will be easier to remember to do so if this comment in configure
> calls out the upstream gluster version that no longer requires the legacy
> workaround, as our hint for when...
>
I can go ahead and add that to the comment in my branch after applying, if
Niels can let me know what that version is/will be (if known).
> > else
> > if test "$glusterfs" = "yes" ; then
> > feature_not_found "GlusterFS backend support" \
> >@@ -6644,6 +6658,10 @@ if test "$glusterfs_zerofill" = "yes" ; then
> > echo "CONFIG_GLUSTERFS_ZEROFILL=y" >> $config_host_mak
> > fi
> >+if test "$glusterfs_legacy_ftruncate" = "yes" ; then
> >+ echo "CONFIG_GLUSTERFS_LEGACY_FTRUNCATE=y" >> $config_host_mak
>
> ...this #define is no longer necessary.
>
> --
> Eric Blake, Principal Software Engineer
> Red Hat, Inc. +1-919-301-3266
> Virtualization: qemu.org | libvirt.org
- [Qemu-block] [PATCH v3] block/gluster: Handle changed glfs_ftruncate signature, Niels de Vos, 2018/07/27
- Re: [Qemu-block] [PATCH v3 for-3.0] block/gluster: Handle changed glfs_ftruncate signature, Eric Blake, 2018/07/27
- Re: [Qemu-block] [PATCH v3] block/gluster: Handle changed glfs_ftruncate signature, Eric Blake, 2018/07/27
- Re: [Qemu-block] [PATCH v3] block/gluster: Handle changed glfs_ftruncate signature,
Jeff Cody <=
- Re: [Qemu-block] [PATCH v3] block/gluster: Handle changed glfs_ftruncate signature, Niels de Vos, 2018/07/28
- Re: [Qemu-block] [PATCH v3] block/gluster: Handle changed glfs_ftruncate signature, Eric Blake, 2018/07/30
- Re: [Qemu-block] [PATCH v3] block/gluster: Handle changed glfs_ftruncate signature, Jeff Cody, 2018/07/30
- Re: [Qemu-block] [PATCH v3] block/gluster: Handle changed glfs_ftruncate signature, Niels de Vos, 2018/07/31
- Re: [Qemu-block] [PATCH v3] block/gluster: Handle changed glfs_ftruncate signature, Jeff Cody, 2018/07/31
- Re: [Qemu-block] [PATCH v3] block/gluster: Handle changed glfs_ftruncate signature, Jeff Cody, 2018/07/30