[libvirt] [PATCH 1/4] Introduce virFileSync

[Daniel P. Berrange]

On Wed, Oct 19, 2011 at 07:26:24PM +0200, Jiri Denemark wrote:
> It still needs to be enhanced to be fully portable and working even if
> fsync() implementation is insane (e.g., on OSX).
> ---
> Notes:
>     Although ideally gnulib would provide us with a sane fsync() and
>     fdatasync() replacements (it already does so for fsync on Win32)
>     so this could probably be dropped in favor of a possible future
>     extension of gnulib (we do not provide any better solution anyway).
> 
>  src/libvirt_private.syms |    1 +
>  src/util/virfile.c       |   16 ++++++++++++++++
>  src/util/virfile.h       |    2 ++
>  3 files changed, 19 insertions(+), 0 deletions(-)
> 
> diff --git a/src/libvirt_private.syms b/src/libvirt_private.syms
> index dedbd16..9666a0a 100644
> --- a/src/libvirt_private.syms
> +++ b/src/libvirt_private.syms
> @@ -1172,6 +1172,7 @@ virFileDirectFdFree;
>  virFileDirectFdNew;
>  virFileFclose;
>  virFileFdopen;
> +virFileSync;
>  
>  
>  # virnetmessage.h
> diff --git a/src/util/virfile.c b/src/util/virfile.c
> index 1158998..50b8aab 100644
> --- a/src/util/virfile.c
> +++ b/src/util/virfile.c
> @@ -334,3 +334,19 @@ int virFileUnlock(int fd ATTRIBUTE_UNUSED,
>      return -ENOSYS;
>  }
>  #endif
> +
> +int
> +virFileSync(int fd, bool metadata)
> +{
> +    int ret;
> +
> +    /* XXX This needs to be enhanced to properly sync even on OSX which
> +     * lacks sane fsync() */
> +
> +    if (metadata)
> +        ret = fsync(fd);
> +    else
> +        ret = fdatasync(fd);
> +
> +    return ret;
> +}
> diff --git a/src/util/virfile.h b/src/util/virfile.h
> index e025614..0b14e1d 100644
> --- a/src/util/virfile.h
> +++ b/src/util/virfile.h
> @@ -68,4 +68,6 @@ void virFileDirectFdFree(virFileDirectFdPtr dfd);
>  int virFileLock(int fd, bool shared, off_t start, off_t len);
>  int virFileUnlock(int fd, off_t start, off_t len);
>  
> +int virFileSync(int fd, bool metadata);
> +
>  #endif /* __VIR_FILES_H */

ACK


Daniel
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