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authorKoji Sato <sato.koji@lab.ntt.co.jp>2009-04-06 19:01:25 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-07 08:31:13 -0700
commit36a580eb489f54d81a0534974962e732a314b999 (patch)
treebf28d0b13c4187b11c58822bc49a87453d83f877 /fs/nilfs2/direct.h
parent17c76b0104e4a6513983777e1a17e0297a12b0c4 (diff)
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nilfs2: direct block mapping
This adds block mappings using direct pointers which are stored in the i_bmap array of inode. 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: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/nilfs2/direct.h')
-rw-r--r--fs/nilfs2/direct.h78
1 files changed, 78 insertions, 0 deletions
diff --git a/fs/nilfs2/direct.h b/fs/nilfs2/direct.h
new file mode 100644
index 000000000000..45d2c5cda812
--- /dev/null
+++ b/fs/nilfs2/direct.h
@@ -0,0 +1,78 @@
+/*
+ * direct.h - NILFS direct block pointer.
+ *
+ * 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_DIRECT_H
+#define _NILFS_DIRECT_H
+
+#include <linux/types.h>
+#include <linux/buffer_head.h>
+#include "bmap.h"
+
+
+struct nilfs_direct;
+
+/**
+ * struct nilfs_direct_operations - direct mapping operation table
+ */
+struct nilfs_direct_operations {
+ __u64 (*dop_find_target)(const struct nilfs_direct *, __u64);
+ void (*dop_set_target)(struct nilfs_direct *, __u64, __u64);
+ int (*dop_propagate)(struct nilfs_direct *, struct buffer_head *);
+ int (*dop_assign)(struct nilfs_direct *, __u64, __u64,
+ struct buffer_head **, sector_t,
+ union nilfs_binfo *);
+};
+
+/**
+ * struct nilfs_direct_node - direct node
+ * @dn_flags: flags
+ * @dn_pad: padding
+ */
+struct nilfs_direct_node {
+ __u8 dn_flags;
+ __u8 pad[7];
+};
+
+/**
+ * struct nilfs_direct - direct mapping
+ * @d_bmap: bmap structure
+ * @d_ops: direct mapping operation table
+ */
+struct nilfs_direct {
+ struct nilfs_bmap d_bmap;
+
+ /* direct-mapping-specific members */
+ const struct nilfs_direct_operations *d_ops;
+};
+
+
+#define NILFS_DIRECT_NBLOCKS (NILFS_BMAP_SIZE / sizeof(__le64) - 1)
+#define NILFS_DIRECT_KEY_MIN 0
+#define NILFS_DIRECT_KEY_MAX (NILFS_DIRECT_NBLOCKS - 1)
+
+
+int nilfs_direct_init(struct nilfs_bmap *, __u64, __u64);
+int nilfs_direct_delete_and_convert(struct nilfs_bmap *, __u64, __u64 *,
+ __u64 *, int, __u64, __u64);
+
+
+#endif /* _NILFS_DIRECT_H */