[XFS] implement generic xfs_btree_get_rec

[safe/jmp/linux-2.6] / fs / xfs / xfs_btree.c

diff --git a/fs/xfs/xfs_btree.c b/fs/xfs/xfs_btree.c
index 28cc768..8503ed5 100644 (file)
--- a/fs/xfs/xfs_btree.c
+++ b/fs/xfs/xfs_btree.c
@@ -3764,3 +3764,44 @@ error0:
        XFS_BTREE_TRACE_CURSOR(cur, XBT_ERROR);
        return error;
 }
+
+/*
+ * Get the data from the pointed-to record.
+ */
+int                                    /* error */
+xfs_btree_get_rec(
+       struct xfs_btree_cur    *cur,   /* btree cursor */
+       union xfs_btree_rec     **recp, /* output: btree record */
+       int                     *stat)  /* output: success/failure */
+{
+       struct xfs_btree_block  *block; /* btree block */
+       struct xfs_buf          *bp;    /* buffer pointer */
+       int                     ptr;    /* record number */
+#ifdef DEBUG
+       int                     error;  /* error return value */
+#endif
+
+       ptr = cur->bc_ptrs[0];
+       block = xfs_btree_get_block(cur, 0, &bp);
+
+#ifdef DEBUG
+       error = xfs_btree_check_block(cur, block, 0, bp);
+       if (error)
+               return error;
+#endif
+
+       /*
+        * Off the right end or left end, return failure.
+        */
+       if (ptr > xfs_btree_get_numrecs(block) || ptr <= 0) {
+               *stat = 0;
+               return 0;
+       }
+
+       /*
+        * Point to the record and extract its data.
+        */
+       *recp = xfs_btree_rec_addr(cur, ptr, block);
+       *stat = 1;
+       return 0;
+}