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authorRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2009-04-06 19:01:29 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2009-04-07 08:31:13 -0700
commit5442680fd23abc01f29af585cc1a2f793bd74565 (patch)
treeecc3231149c4f0d422443cab2f4df60ba3a3ca03 /fs/nilfs2/alloc.h
parent5eb563f5f299a2ed488d9eb52acede45ccb14c7b (diff)
downloadlinux-5442680fd23abc01f29af585cc1a2f793bd74565.tar.bz2
nilfs2: persistent object allocator
This adds common functions to allocate or deallocate entries with bitmaps on a meta data file. This feature is used by the DAT and ifile. 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: Yoshiji Amagai <amagai.yoshiji@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/alloc.h')
-rw-r--r--fs/nilfs2/alloc.h72
1 files changed, 72 insertions, 0 deletions
diff --git a/fs/nilfs2/alloc.h b/fs/nilfs2/alloc.h
new file mode 100644
index 000000000000..4ace5475c2c7
--- /dev/null
+++ b/fs/nilfs2/alloc.h
@@ -0,0 +1,72 @@
+/*
+ * alloc.h - persistent object (dat entry/disk inode) allocator/deallocator
+ *
+ * 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
+ *
+ * Original code was written by Koji Sato <koji@osrg.net>.
+ * Two allocators were unified by Ryusuke Konishi <ryusuke@osrg.net>,
+ * Amagai Yoshiji <amagai@osrg.net>.
+ */
+
+#ifndef _NILFS_ALLOC_H
+#define _NILFS_ALLOC_H
+
+#include <linux/types.h>
+#include <linux/buffer_head.h>
+#include <linux/fs.h>
+
+static inline unsigned long
+nilfs_palloc_entries_per_group(const struct inode *inode)
+{
+ return 1UL << (inode->i_blkbits + 3 /* log2(8 = CHAR_BITS) */);
+}
+
+int nilfs_palloc_init_blockgroup(struct inode *, unsigned);
+int nilfs_palloc_get_entry_block(struct inode *, __u64, int,
+ struct buffer_head **);
+void *nilfs_palloc_block_get_entry(const struct inode *, __u64,
+ const struct buffer_head *, void *);
+
+/**
+ * nilfs_palloc_req - persistent alloctor request and reply
+ * @pr_entry_nr: entry number (vblocknr or inode number)
+ * @pr_desc_bh: buffer head of the buffer containing block group descriptors
+ * @pr_bitmap_bh: buffer head of the buffer containing a block group bitmap
+ * @pr_entry_bh: buffer head of the buffer containing translation entries
+ */
+struct nilfs_palloc_req {
+ __u64 pr_entry_nr;
+ struct buffer_head *pr_desc_bh;
+ struct buffer_head *pr_bitmap_bh;
+ struct buffer_head *pr_entry_bh;
+};
+
+int nilfs_palloc_prepare_alloc_entry(struct inode *,
+ struct nilfs_palloc_req *);
+void nilfs_palloc_commit_alloc_entry(struct inode *,
+ struct nilfs_palloc_req *);
+void nilfs_palloc_abort_alloc_entry(struct inode *, struct nilfs_palloc_req *);
+void nilfs_palloc_commit_free_entry(struct inode *, struct nilfs_palloc_req *);
+int nilfs_palloc_prepare_free_entry(struct inode *, struct nilfs_palloc_req *);
+void nilfs_palloc_abort_free_entry(struct inode *, struct nilfs_palloc_req *);
+int nilfs_palloc_freev(struct inode *, __u64 *, size_t);
+
+#define nilfs_set_bit_atomic ext2_set_bit_atomic
+#define nilfs_clear_bit_atomic ext2_clear_bit_atomic
+#define nilfs_find_next_zero_bit ext2_find_next_zero_bit
+
+#endif /* _NILFS_ALLOC_H */