xfs: introduce xfs_sb.c for sharing with libxfs

xfs_mount.c is shared with userspace, but the only functions that
are shared are to do with physical superblock manipulations. This
means that less than 25% of the xfs_mount.c code is actually shared
with userspace. Move all the superblock functions to xfs_sb.c and
share that instead with libxfs.

Note that this will leave all the in-core transaction related
superblock counter modifications in xfs_mount.c as none of that is
shared with userspace. With a few more small changes, xfs_mount.h
won't need to be shared with userspace anymore, either.

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, 2 insertions, 17 deletions

diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
index 27d0d5c72f4f..5488df18c200 100644
--- a/fs/xfs/xfs_mount.h
+++ b/fs/xfs/xfs_mount.h
@@ -292,14 +292,6 @@ xfs_daddr_to_agbno(struct xfs_mount *mp, xfs_daddr_t d)
 }
 
 /*
- * perag get/put wrappers for ref counting
- */
-struct xfs_perag *xfs_perag_get(struct xfs_mount *mp, xfs_agnumber_t agno);
-struct xfs_perag *xfs_perag_get_tag(struct xfs_mount *mp, xfs_agnumber_t agno,
-                                        int tag);
-void    xfs_perag_put(struct xfs_perag *pag);
-
-/*
  * Per-cpu superblock locking functions
  */
 #ifdef HAVE_PERCPU_SB
@@ -331,6 +323,8 @@ typedef struct xfs_mod_sb {
 extern int      xfs_log_sbcount(xfs_mount_t *);
 extern __uint64_t xfs_default_resblks(xfs_mount_t *mp);
 extern int      xfs_mountfs(xfs_mount_t *mp);
+extern int      xfs_initialize_perag(xfs_mount_t *mp, xfs_agnumber_t agcount,
+                                     xfs_agnumber_t *maxagi);
 
 extern void     xfs_unmountfs(xfs_mount_t *);
 extern int      xfs_mod_incore_sb(xfs_mount_t *, xfs_sb_field_t, int64_t, int);
@@ -349,13 +343,4 @@ extern void	xfs_set_low_space_thresholds(struct xfs_mount *);
 
 #endif  /* __KERNEL__ */
 
-extern void     xfs_sb_calc_crc(struct xfs_buf  *);
-extern void     xfs_mod_sb(struct xfs_trans *, __int64_t);
-extern int      xfs_initialize_perag(struct xfs_mount *, xfs_agnumber_t,
-                                        xfs_agnumber_t *);
-extern void     xfs_sb_from_disk(struct xfs_sb *, struct xfs_dsb *);
-extern void     xfs_sb_to_disk(struct xfs_dsb *, struct xfs_sb *, __int64_t);
-
-extern const struct xfs_buf_ops xfs_sb_buf_ops;
-
 #endif  /* __XFS_MOUNT_H__ */