[XFS] 929045 567344 This mod re-organizes some of the in-core file extent

code to prepare for an upcoming mod which will introduce multi-level
in-core extent allocations. Although the in-core extent management is
using a new code path in this mod, the functionality remains the same. 
Major changes include:	- Introduce 10 new subroutines which re-orgainze
the existing code but	do NOT change functionality:	    
xfs_iext_get_ext()	   xfs_iext_insert()	     xfs_iext_add()	  
 xfs_iext_remove()	   xfs_iext_remove_inline()	   
xfs_iext_remove_direct()	 xfs_iext_realloc_direct()	  
xfs_iext_direct_to_inline()	    xfs_iext_inline_to_direct()        
xfs_iext_destroy() - Remove 2 subroutines (functionality moved to new
subroutines above):	    xfs_iext_realloc() -replaced by xfs_iext_add()
and xfs_iext_remove()	      xfs_bmap_insert_exlist() - replaced by
xfs_iext_insert()	  xfs_bmap_delete_exlist() - replaced by
xfs_iext_remove() - Replace all hard-coded (indexed) extent assignments
with a call to	 xfs_iext_get_ext() - Replace all extent record pointer
arithmetic (ep++, ep--, base + lastx,..)   with calls to
xfs_iext_get_ext() - Update comments to remove the idea of a single
"extent list" and   introduce "extent record" terminology instead

SGI-PV: 928864
SGI-Modid: xfs-linux-melb:xfs-kern:207390a

Signed-off-by: Mandy Kirkconnell <alkirkco@sgi.com>
Signed-off-by: Nathan Scott <nathans@sgi.com>

1 files changed, 12 insertions, 6 deletions

diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h
index 1cfbcf18ce86..740b73fabd2f 100644
--- a/fs/xfs/xfs_inode.h
+++ b/fs/xfs/xfs_inode.h
@@ -70,12 +70,6 @@ typedef struct xfs_ifork {
  */
 #define XFS_IMAP_LOOKUP         0x1
 
-/*
- * Maximum number of extent pointers in if_u1.if_extents.
- */
-#define XFS_MAX_INCORE_EXTENTS  32768
-
-
 #ifdef __KERNEL__
 struct bhv_desc;
 struct cred;
@@ -440,6 +434,18 @@ xfs_inode_t	*xfs_vtoi(struct vnode *vp);
 
 void            xfs_synchronize_atime(xfs_inode_t *);
 
+xfs_bmbt_rec_t  *xfs_iext_get_ext(xfs_ifork_t *, xfs_extnum_t);
+void            xfs_iext_insert(xfs_ifork_t *, xfs_extnum_t, xfs_extnum_t,
+                                xfs_bmbt_irec_t *);
+void            xfs_iext_add(xfs_ifork_t *, xfs_extnum_t, int);
+void            xfs_iext_remove(xfs_ifork_t *, xfs_extnum_t, int);
+void            xfs_iext_remove_inline(xfs_ifork_t *, xfs_extnum_t, int);
+void            xfs_iext_remove_direct(xfs_ifork_t *, xfs_extnum_t, int);
+void            xfs_iext_realloc_direct(xfs_ifork_t *, int);
+void            xfs_iext_direct_to_inline(xfs_ifork_t *, xfs_extnum_t);
+void            xfs_iext_inline_to_direct(xfs_ifork_t *, int);
+void            xfs_iext_destroy(xfs_ifork_t *);
+
 #define xfs_ipincount(ip)       ((unsigned int) atomic_read(&ip->i_pincount))
 
 #ifdef DEBUG