[Ocfs2-devel] [PATCH 19/30] ocfs2: Handle missing iop->fallocate()

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

On Thu, Dec 20, 2007 at 03:29:36PM -0800, Sunil Mushran wrote:
> Commit 97ac73506c0ba93f30239bb57b4cfc5d73e68a62 in mainline introduces a
> new iop, fallocate(). This patch allows one to build ocfs2 with kernels
> having/not having this change.

Test is reversed (should be #ifndef NO_FALLOCATE).  I'm trying to think
how we could move the #ifdef to a kapi-compat file, but I'm not coming
up with anything.

Joel
 
> Signed-off-by: Sunil Mushran <sunil.mushran@oracle.com>
> ---
>  Config.make.in    |    1 +
>  configure.in      |    5 +++++
>  fs/ocfs2/Makefile |    4 ++++
>  fs/ocfs2/file.c   |    6 ++++++
>  4 files changed, 16 insertions(+), 0 deletions(-)
> 
> diff --git a/Config.make.in b/Config.make.in
> index a27e274..3818cd5 100644
> --- a/Config.make.in
> +++ b/Config.make.in
> @@ -65,6 +65,7 @@ KMEM_CACHE_CREATE_DTOR = @KMEM_CACHE_CREATE_DTOR@
>  REGISTER_SYSCTL_TWO_ARGS = @REGISTER_SYSCTL_TWO_ARGS@
>  SU_MUTEX_DEFINED = @SU_MUTEX_DEFINED@
>  STRUCT_SUBSYSTEM_DEFINED = @STRUCT_SUBSYSTEM_DEFINED@
> +FALLOCATE_DEFINED = @FALLOCATE_DEFINED@
>  
>  OCFS_DEBUG = @OCFS_DEBUG@
>  
> diff --git a/configure.in b/configure.in
> index f8b5f20..74337ee 100644
> --- a/configure.in
> +++ b/configure.in
> @@ -242,6 +242,11 @@ OCFS2_CHECK_KERNEL([is_owner_or_cap() in fs.h], fs.h,
>    , cap_compat_header="cap.h", [^#define is_owner_or_cap])
>  KAPI_COMPAT_HEADERS="$KAPI_COMPAT_HEADERS $cap_compat_header"
>  
> +FALLOCATE_DEFINED=
> +OCFS2_CHECK_KERNEL([fallocate() in fs.h], fs.h,
> +  FALLOCATE_DEFINED=yes, , [^.*long (\*fallocate)])
> +AC_SUBST(FALLOCATE_DEFINED)
> +
>  # 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 5c290b7..6f21960 100644
> --- a/fs/ocfs2/Makefile
> +++ b/fs/ocfs2/Makefile
> @@ -45,6 +45,10 @@ ifdef STRUCT_SUBSYSTEM_DEFINED
>  EXTRA_CFLAGS += -DSTRUCT_SUBSYSTEM_DEFINED
>  endif
>  
> +ifdef FALLOCATE_DEFINED
> +EXTRA_CFLAGS += -DFALLOCATE_DEFINED
> +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 adb10b9..ce18447 100644
> --- a/fs/ocfs2/file.c
> +++ b/fs/ocfs2/file.c
> @@ -34,7 +34,9 @@
>  #include <linux/splice.h>
>  #include <linux/mount.h>
>  #include <linux/writeback.h>
> +#ifdef FALLOCATE_DEFINED
>  #include <linux/falloc.h>
> +#endif
>  
>  #define MLOG_MASK_PREFIX ML_INODE
>  #include <cluster/masklog.h>
> @@ -1749,6 +1751,7 @@ int ocfs2_change_file_space(struct file *file, unsigned int cmd,
>  	return __ocfs2_change_file_space(file, inode, file->f_pos, cmd, sr, 0);
>  }
>  
> +#ifdef FALLOCATE_DEFINED
>  static long ocfs2_fallocate(struct inode *inode, int mode, loff_t offset,
>  			    loff_t len)
>  {
> @@ -1772,6 +1775,7 @@ static long ocfs2_fallocate(struct inode *inode, int mode, loff_t offset,
>  	return __ocfs2_change_file_space(NULL, inode, offset,
>  					 OCFS2_IOC_RESVSP64, &sr, change_size);
>  }
> +#endif
>  
>  static int ocfs2_prepare_inode_for_write(struct dentry *dentry,
>  					 loff_t *ppos,
> @@ -2397,7 +2401,9 @@ const struct inode_operations ocfs2_file_iops = {
>  	.setattr	= ocfs2_setattr,
>  	.getattr	= ocfs2_getattr,
>  	.permission	= ocfs2_permission,
> +#ifdef FALLOCATE_DEFINED
>  	.fallocate	= ocfs2_fallocate,
> +#endif
>  };
>  
>  const struct inode_operations ocfs2_special_file_iops = {
> -- 
> 1.5.2.5
> 
> 
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-- 

Life's Little Instruction Book #80

	"Slow dance"

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