[lttng-dev] [PATCH] Make sync_file_range() usage optional

[Mathieu Desnoyers]

* Samuel Martin (s.martin49 at gmail.com) wrote:
> Under uClibc, sync_file_range() is not available under all
> architectures, so we fall back to fdatasync() in this case.

Hi Samuel,

For future, please specify either of:

[PATCH urcu]
[PATCH lttng-tools]
[PATCH lttng-ust]
[PATCH lttng-modules]

in the subject.

This patch belongs to lttng-tools, so I CC David who maintains it.

Acked-by: Mathieu Desnoyers <mathieu.desnoyers at efficios.com>

Thanks!

Mathieu

> 
> Signed-off-by: Thomas Petazzoni <thomas.petazzoni at free-electrons.com>
> Signed-off-by: Samuel Martin <s.martin49 at gmail.com>
> ---
>  configure.ac                     | 2 +-
>  src/common/compat/compat-fcntl.c | 4 ++++
>  2 files changed, 5 insertions(+), 1 deletion(-)
> 
> diff --git a/configure.ac b/configure.ac
> index 425941b..80940c0 100644
> --- a/configure.ac
> +++ b/configure.ac
> @@ -150,7 +150,7 @@ AS_IF([test "x$lttng_ust_support" = "xyes"], [
>  	)
>  ])
>  AM_CONDITIONAL([HAVE_LIBLTTNG_UST_CTL], [test "x$lttng_ust_ctl_found" = xyes])
> -AC_CHECK_FUNCS([sched_getcpu sysconf])
> +AC_CHECK_FUNCS([sched_getcpu sysconf sync_file_range])
>  
>  # check for dlopen
>  AC_CHECK_LIB([dl], [dlopen],
> diff --git a/src/common/compat/compat-fcntl.c b/src/common/compat/compat-fcntl.c
> index 5a1c757..7ff63a3 100644
> --- a/src/common/compat/compat-fcntl.c
> +++ b/src/common/compat/compat-fcntl.c
> @@ -23,7 +23,11 @@
>  int compat_sync_file_range(int fd, off64_t offset, off64_t nbytes,
>  		unsigned int flags)
>  {
> +#ifdef HAVE_SYNC_FILE_RANGE
>  	return sync_file_range(fd, offset, nbytes, flags);
> +#else
> +	return fdatasync(fd);
> +#endif
>  }
>  
>  #endif /* __linux__ */
> -- 
> 1.8.1
> 
> 
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-- 
Mathieu Desnoyers
EfficiOS Inc.
http://www.efficios.com