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authorKoji Sato <sato.koji@lab.ntt.co.jp>2009-04-06 19:01:23 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-07 08:31:13 -0700
commitbdb265eae08db578e7cf5739be16f389d495fc75 (patch)
tree34f3b37b067504b945e851ef2a8ead07347a27df /fs/nilfs2/bmap_union.h
parent65b4643d3babeb203fa9571d12fd5e1bf74d27b0 (diff)
nilfs2: integrated block mapping
This adds structures and operations for the block mapping (bmap for short). NILFS2 uses direct mappings for short files or B-tree based mappings for longer files. Every on-disk data block is held with inodes and managed through this block mapping. The nilfs_bmap structure and a set of functions here provide this capability to the NILFS2 inode. [penberg@cs.helsinki.fi: remove a bunch of bmap wrapper macros] [akpm@linux-foundation.org: coding-style fixes] Signed-off-by: Koji Sato <sato.koji@lab.ntt.co.jp> Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/nilfs2/bmap_union.h')
-rw-r--r--fs/nilfs2/bmap_union.h42
1 files changed, 42 insertions, 0 deletions
diff --git a/fs/nilfs2/bmap_union.h b/fs/nilfs2/bmap_union.h
new file mode 100644
index 00000000000..d41509bff47
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+++ b/fs/nilfs2/bmap_union.h
@@ -0,0 +1,42 @@
+/*
+ * bmap_union.h - NILFS block mapping.
+ *
+ * Copyright (C) 2006-2008 Nippon Telegraph and Telephone Corporation.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ * Written by Koji Sato <koji@osrg.net>.
+ */
+
+#ifndef _NILFS_BMAP_UNION_H
+#define _NILFS_BMAP_UNION_H
+
+#include "bmap.h"
+#include "direct.h"
+#include "btree.h"
+
+/**
+ * nilfs_bmap_union -
+ * @bi_bmap: bmap structure
+ * @bi_btree: direct map structure
+ * @bi_direct: B-tree structure
+ */
+union nilfs_bmap_union {
+ struct nilfs_bmap bi_bmap;
+ struct nilfs_direct bi_direct;
+ struct nilfs_btree bi_btree;
+};
+
+#endif /* _NILFS_BMAP_UNION_H */