diff options
author | Koji Sato <sato.koji@lab.ntt.co.jp> | 2009-04-07 02:01:23 (GMT) |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2009-04-07 15:31:13 (GMT) |
commit | bdb265eae08db578e7cf5739be16f389d495fc75 (patch) | |
tree | 34f3b37b067504b945e851ef2a8ead07347a27df /fs/nilfs2/bmap_union.h | |
parent | 65b4643d3babeb203fa9571d12fd5e1bf74d27b0 (diff) | |
download | linux-fsl-qoriq-bdb265eae08db578e7cf5739be16f389d495fc75.tar.xz |
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.h | 42 |
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 0000000..d41509b --- /dev/null +++ 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 */ |