[XFS] add a long pointers flag to xfs_btree_cur

Add a flag to the xfs btree cursor when using long (64bit) block pointers
instead of checking btnum == XFS_BTNUM_BMAP.

SGI-PV: 985583

SGI-Modid: xfs-linux-melb:xfs-kern:32181a

Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
Signed-off-by: Bill O'Donnell <billodo@sgi.com>
Signed-off-by: David Chinner <david@fromorbit.com>

3 files changed, 5 insertions, 9 deletions

diff --git a/fs/xfs/xfs_bmap_btree.c b/fs/xfs/xfs_bmap_btree.c
index d9bbed676e0c..1ec494e111b5 100644
--- a/fs/xfs/xfs_bmap_btree.c
+++ b/fs/xfs/xfs_bmap_btree.c
@@ -2656,7 +2656,7 @@ xfs_bmbt_init_cursor(
         cur->bc_blocklog = mp->m_sb.sb_blocklog;
 
         cur->bc_ops = &xfs_bmbt_ops;
-        cur->bc_flags = XFS_BTREE_ROOT_IN_INODE;
+        cur->bc_flags = XFS_BTREE_LONG_PTRS | XFS_BTREE_ROOT_IN_INODE;
 
         cur->bc_private.b.forksize = XFS_IFORK_SIZE(ip, whichfork);
         cur->bc_private.b.ip = ip;
diff --git a/fs/xfs/xfs_btree.c b/fs/xfs/xfs_btree.c
index 57e858fbf683..59796b42e9c4 100644
--- a/fs/xfs/xfs_btree.c
+++ b/fs/xfs/xfs_btree.c
@@ -90,7 +90,7 @@ xfs_btree_check_block(
         int                     level,  /* level of the btree block */
         xfs_buf_t               *bp)    /* buffer containing block, if any */
 {
-        if (XFS_BTREE_LONG_PTRS(cur->bc_btnum))
+        if (cur->bc_flags & XFS_BTREE_LONG_PTRS)
                 xfs_btree_check_lblock(cur, (xfs_btree_lblock_t *)block, level,
                         bp);
         else
@@ -516,7 +516,7 @@ xfs_btree_islastblock(
 
         block = xfs_btree_get_block(cur, level, &bp);
         xfs_btree_check_block(cur, block, level, bp);
-        if (XFS_BTREE_LONG_PTRS(cur->bc_btnum))
+        if (cur->bc_flags & XFS_BTREE_LONG_PTRS)
                 return be64_to_cpu(block->bb_u.l.bb_rightsib) == NULLDFSBNO;
         else
                 return be32_to_cpu(block->bb_u.s.bb_rightsib) == NULLAGBLOCK;
@@ -808,7 +808,7 @@ xfs_btree_setbuf(
         if (!bp)
                 return;
         b = XFS_BUF_TO_BLOCK(bp);
-        if (XFS_BTREE_LONG_PTRS(cur->bc_btnum)) {
+        if (cur->bc_flags & XFS_BTREE_LONG_PTRS) {
                 if (be64_to_cpu(b->bb_u.l.bb_leftsib) == NULLDFSBNO)
                         cur->bc_ra[lev] |= XFS_BTCUR_LEFTRA;
                 if (be64_to_cpu(b->bb_u.l.bb_rightsib) == NULLDFSBNO)
diff --git a/fs/xfs/xfs_btree.h b/fs/xfs/xfs_btree.h
index fefbc69e500e..dd93fd39c56a 100644
--- a/fs/xfs/xfs_btree.h
+++ b/fs/xfs/xfs_btree.h
@@ -116,11 +116,6 @@ union xfs_btree_rec {
 #define XFS_BB_ALL_BITS         ((1 << XFS_BB_NUM_BITS) - 1)
 
 /*
- * Boolean to select which form of xfs_btree_block_t.bb_u to use.
- */
-#define XFS_BTREE_LONG_PTRS(btnum)      ((btnum) == XFS_BTNUM_BMAP)
-
-/*
  * Magic numbers for btree blocks.
  */
 extern const __uint32_t xfs_magics[];
@@ -203,6 +198,7 @@ typedef struct xfs_btree_cur
 } xfs_btree_cur_t;
 
 /* cursor flags */
+#define XFS_BTREE_LONG_PTRS             (1<<0)  /* pointers are 64bits long */
 #define XFS_BTREE_ROOT_IN_INODE         (1<<1)  /* root may be variable size */