[Ocfs2-devel] [PATCH 28/30] ocfs2: Handle missing __splice_from_pipe()

[Joel Becker <Joel.Becker@oracle.com>]

On Thu, Dec 20, 2007 at 03:29:45PM -0800, Sunil Mushran wrote:
> Commit c66ab6fa705e1b2887a6d9246b798bdc526839e2 in mainline introduced
> __splice_from_pipe(). This patch allows one to build ocfs2 with kernels
> having/not having this change.

	Can we reverse the test?

Joel

> Note: This patch disables splice io for kernels not providing
> __splice_from_pipe(). We will later add a patch to enable splice
> io with such kernels too.
> 
> Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
> ---
>  Config.make.in    |    1 +
>  configure.in      |    5 +++++
>  fs/ocfs2/Makefile |    4 ++++
>  fs/ocfs2/file.c   |    4 ++++
>  4 files changed, 14 insertions(+), 0 deletions(-)
> 
> diff --git a/Config.make.in b/Config.make.in
> index f99b9f4..89c1e94 100644
> --- a/Config.make.in
> +++ b/Config.make.in
> @@ -72,6 +72,7 @@ FAULT_IN_VMOPS = @FAULT_IN_VMOPS@
>  SOP_IS_CONST = @SOP_IS_CONST@
>  IOP_IS_CONST = @IOP_IS_CONST@
>  VECTORED_FILE_AIO = @VECTORED_FILE_AIO@
> +SPLICE_FROM_PIPE = @SPLICE_FROM_PIPE@
>  
>  OCFS_DEBUG = @OCFS_DEBUG@
>  
> diff --git a/configure.in b/configure.in
> index 741dfdb..021b925 100644
> --- a/configure.in
> +++ b/configure.in
> @@ -287,6 +287,11 @@ OCFS2_CHECK_KERNEL([aio_read() in struct file_operations using iovec in fs.h], f
>    VECTORED_FILE_AIO=yes, , [ssize_t (\*aio_read) (struct kiocb \*, const struct iovec \*, unsigned long, loff_t);])
>  AC_SUBST(VECTORED_FILE_AIO)
>  
> +SPLICE_FROM_PIPE=
> +OCFS2_CHECK_KERNEL([__splice_from_pipe() in splice.h], splice.h,
> +  SPLICE_FROM_PIPE=yes, , [^extern ssize_t __splice_from_pipe(struct pipe_inode_info \*])
> +AC_SUBST(SPLICE_FROM_PIPE)
> +
>  # using -include has two advantages:
>  #  the source doesn't need to know to include compat headers
>  #  the compat header file names don't go through the search path
> diff --git a/fs/ocfs2/Makefile b/fs/ocfs2/Makefile
> index 80fd6c6..e4296d3 100644
> --- a/fs/ocfs2/Makefile
> +++ b/fs/ocfs2/Makefile
> @@ -77,6 +77,10 @@ ifdef VECTORED_FILE_AIO
>  EXTRA_CFLAGS += -DVECTORED_FILE_AIO
>  endif
>  
> +ifdef SPLICE_FROM_PIPE
> +EXTRA_CFLAGS += -DSPLICE_FROM_PIPE
> +endif
> +
>  #
>  # Since SUBDIRS means something to kbuild, define them safely.  Do not
>  # include trailing slashes.
> diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
> index 1ee2a79..e022c97 100644
> --- a/fs/ocfs2/file.c
> +++ b/fs/ocfs2/file.c
> @@ -2258,6 +2258,7 @@ out_sems:
>  	return written ? written : ret;
>  }
>  
> +#ifdef SPLICE_FROM_PIPE
>  static int ocfs2_splice_write_actor(struct pipe_inode_info *pipe,
>  				    struct pipe_buffer *buf,
>  				    struct splice_desc *sd)
> @@ -2406,6 +2407,7 @@ bail:
>  	mlog_exit(ret);
>  	return ret;
>  }
> +#endif
>  
>  #ifdef VECTORED_FILE_AIO
>  static ssize_t ocfs2_file_aio_read(struct kiocb *iocb,
> @@ -2530,8 +2532,10 @@ const struct file_operations ocfs2_fops = {
>  #ifdef CONFIG_COMPAT
>  	.compat_ioctl   = ocfs2_compat_ioctl,
>  #endif
> +#ifdef SPLICE_FROM_PIPE
>  	.splice_read	= ocfs2_file_splice_read,
>  	.splice_write	= ocfs2_file_splice_write,
> +#endif
>  };
>  
>  const struct file_operations ocfs2_dops = {
> -- 
> 1.5.2.5
> 
> 
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> Ocfs2-devel@oss.oracle.com
> http://oss.oracle.com/mailman/listinfo/ocfs2-devel

-- 

"Maybe the time has drawn the faces I recall.
 But things in this life change very slowly,
 If they ever change at all."

Joel Becker
Principal Software Developer
Oracle
E-mail: joel.becker@oracle.com
Phone: (650) 506-8127