[XFS] Add parameters to xfs_bmapi() and xfs_bunmapi() to have them report

the range spanned by modifications to the in-core extent map.  Add
XFS_BUNMAPI() and XFS_SWAP_EXTENTS() macros that call xfs_bunmapi() and
xfs_swap_extents() via the ioops vector. Change all calls that may modify
the in-core extent map for the data fork to go through the ioops vector. 
This allows a cache of extent map data to be kept in sync.

SGI-PV: 947615
SGI-Modid: xfs-linux-melb:xfs-kern:209226a

Signed-off-by: Olaf Weber <olaf@sgi.com>
Signed-off-by: Nathan Scott <nathans@sgi.com>

1 files changed, 20 insertions, 2 deletions

diff --git a/fs/xfs/xfs_bmap.h b/fs/xfs/xfs_bmap.h
index 8e0d73d9ccc4..80e93409b78d 100644
--- a/fs/xfs/xfs_bmap.h
+++ b/fs/xfs/xfs_bmap.h
@@ -1,5 +1,5 @@
 /*
- * Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
+ * Copyright (c) 2000-2006 Silicon Graphics, Inc.
  * All Rights Reserved.
  *
  * This program is free software; you can redistribute it and/or
@@ -26,6 +26,20 @@ struct xfs_mount;
 struct xfs_trans;
 
 /*
+ * DELTA: describe a change to the in-core extent list.
+ *
+ * Internally the use of xed_blockount is somewhat funky.
+ * xed_blockcount contains an offset much of the time because this
+ * makes merging changes easier.  (xfs_fileoff_t and xfs_filblks_t are
+ * the same underlying type).
+ */
+typedef struct xfs_extdelta
+{
+        xfs_fileoff_t           xed_startoff;   /* offset of range */
+        xfs_filblks_t           xed_blockcount; /* blocks in range */
+} xfs_extdelta_t;
+
+/*
  * List of extents to be free "later".
  * The list is kept sorted on xbf_startblock.
  */
@@ -275,7 +289,9 @@ xfs_bmapi(
         xfs_extlen_t            total,          /* total blocks needed */
         struct xfs_bmbt_irec    *mval,          /* output: map values */
         int                     *nmap,          /* i/o: mval size/count */
-        xfs_bmap_free_t         *flist);        /* i/o: list extents to free */
+        xfs_bmap_free_t         *flist,         /* i/o: list extents to free */
+        xfs_extdelta_t          *delta);        /* o: change made to incore
+                                                   extents */
 
 /*
  * Map file blocks to filesystem blocks, simple version.
@@ -309,6 +325,8 @@ xfs_bunmapi(
         xfs_fsblock_t           *firstblock,    /* first allocated block
                                                    controls a.g. for allocs */
         xfs_bmap_free_t         *flist,         /* i/o: list extents to free */
+        xfs_extdelta_t          *delta,         /* o: change made to incore
+                                                   extents */
         int                     *done);         /* set if not done yet */
 
 /*