xfs: create xfs_bmap_util.[ch]

There is a bunch of code in xfs_bmap.c that is kernel specific and
not shared with userspace. To minimise the difference between the
kernel and userspace code, shift this unshared code to
xfs_bmap_util.c, and the declarations to xfs_bmap_util.h.

The biggest issue here is xfs_bmap_finish() - userspace has it's own
definition of this function, and so we need to move it out of
xfs_bmap.[ch]. This means several other files need to include
xfs_bmap_util.h as well.

It also introduces and interesting dance for the stack switching
code in xfs_bmapi_allocate(). The stack switching/workqueue code is
actually moved to xfs_bmap_util.c, so that userspace can simply use
a #define in a header file to connect the dots without needing to
know about the stack switch code at all.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Mark Tinguely <tinguely@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>

1 files changed, 1 insertions, 0 deletions

diff --git a/fs/xfs/Makefile b/fs/xfs/Makefile
index fb14461d414e..dcd21b95cd98 100644
--- a/fs/xfs/Makefile
+++ b/fs/xfs/Makefile
@@ -30,6 +30,7 @@ xfs-y				+= xfs_aops.o \
                                    xfs_attr_inactive.o \
                                    xfs_attr_list.o \
                                    xfs_bit.o \
+                                   xfs_bmap_util.o \
                                    xfs_buf.o \
                                    xfs_dfrag.o \
                                    xfs_dir2_readdir.o \