1 files changed, 45 insertions, 11 deletions

diff --git a/fs/xfs/xfs_btree.c b/fs/xfs/xfs_btree.c
index 829af92f0fba..04f9cca8da7e 100644
--- a/fs/xfs/xfs_btree.c
+++ b/fs/xfs/xfs_btree.c
@@ -217,7 +217,7 @@ xfs_btree_del_cursor(
          */
         for (i = 0; i < cur->bc_nlevels; i++) {
                 if (cur->bc_bufs[i])
-                        xfs_btree_setbuf(cur, i, NULL);
+                        xfs_trans_brelse(cur->bc_tp, cur->bc_bufs[i]);
                 else if (!error)
                         break;
         }
@@ -656,7 +656,7 @@ xfs_btree_reada_bufl(
 
         ASSERT(fsbno != NULLFSBLOCK);
         d = XFS_FSB_TO_DADDR(mp, fsbno);
-        xfs_baread(mp->m_ddev_targp, d, mp->m_bsize * count);
+        xfs_buf_readahead(mp->m_ddev_targp, d, mp->m_bsize * count);
 }
 
 /*
@@ -676,7 +676,7 @@ xfs_btree_reada_bufs(
         ASSERT(agno != NULLAGNUMBER);
         ASSERT(agbno != NULLAGBLOCK);
         d = XFS_AGB_TO_DADDR(mp, agno, agbno);
-        xfs_baread(mp->m_ddev_targp, d, mp->m_bsize * count);
+        xfs_buf_readahead(mp->m_ddev_targp, d, mp->m_bsize * count);
 }
 
 STATIC int
@@ -763,22 +763,19 @@ xfs_btree_readahead(
  * Set the buffer for level "lev" in the cursor to bp, releasing
  * any previous buffer.
  */
-void
+STATIC void
 xfs_btree_setbuf(
         xfs_btree_cur_t         *cur,   /* btree cursor */
         int                     lev,    /* level in btree */
         xfs_buf_t               *bp)    /* new buffer to set */
 {
         struct xfs_btree_block  *b;     /* btree block */
-        xfs_buf_t               *obp;   /* old buffer pointer */
 
-        obp = cur->bc_bufs[lev];
-        if (obp)
-                xfs_trans_brelse(cur->bc_tp, obp);
+        if (cur->bc_bufs[lev])
+                xfs_trans_brelse(cur->bc_tp, cur->bc_bufs[lev]);
         cur->bc_bufs[lev] = bp;
         cur->bc_ra[lev] = 0;
-        if (!bp)
-                return;
+
         b = XFS_BUF_TO_BLOCK(bp);
         if (cur->bc_flags & XFS_BTREE_LONG_PTRS) {
                 if (be64_to_cpu(b->bb_u.l.bb_leftsib) == NULLDFSBNO)
@@ -3011,6 +3008,43 @@ out0:
         return 0;
 }
 
+/*
+ * Kill the current root node, and replace it with it's only child node.
+ */
+STATIC int
+xfs_btree_kill_root(
+        struct xfs_btree_cur    *cur,
+        struct xfs_buf          *bp,
+        int                     level,
+        union xfs_btree_ptr     *newroot)
+{
+        int                     error;
+
+        XFS_BTREE_TRACE_CURSOR(cur, XBT_ENTRY);
+        XFS_BTREE_STATS_INC(cur, killroot);
+
+        /*
+         * Update the root pointer, decreasing the level by 1 and then
+         * free the old root.
+         */
+        cur->bc_ops->set_root(cur, newroot, -1);
+
+        error = cur->bc_ops->free_block(cur, bp);
+        if (error) {
+                XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
+                return error;
+        }
+
+        XFS_BTREE_STATS_INC(cur, free);
+
+        cur->bc_bufs[level] = NULL;
+        cur->bc_ra[level] = 0;
+        cur->bc_nlevels--;
+
+        XFS_BTREE_TRACE_CURSOR(cur, XBT_EXIT);
+        return 0;
+}
+
 STATIC int
 xfs_btree_dec_cursor(
         struct xfs_btree_cur    *cur,
@@ -3195,7 +3229,7 @@ xfs_btree_delrec(
                          * Make it the new root of the btree.
                          */
                         pp = xfs_btree_ptr_addr(cur, 1, block);
-                        error = cur->bc_ops->kill_root(cur, bp, level, pp);
+                        error = xfs_btree_kill_root(cur, bp, level, pp);
                         if (error)
                                 goto error0;
                 } else if (level > 0) {