From d501d7368937740e8d06671a4bfe4e236ed25bd0 Mon Sep 17 00:00:00 2001
From: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Date: Fri, 13 Nov 2009 16:04:11 +0900
Subject: nilfs2: separate function for creating new btree node block
Adds a separate routine for creating a btree node block. This is a
preparation to reduce the depth of function calls during submitting
btree node buffer.
Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
---
fs/nilfs2/btnode.c | 26 ++++++++++++++++++++++++++
fs/nilfs2/btnode.h | 2 ++
2 files changed, 28 insertions(+)
diff --git a/fs/nilfs2/btnode.c b/fs/nilfs2/btnode.c
index 84c25382f8e..fc3e4bdb62a 100644
--- a/fs/nilfs2/btnode.c
+++ b/fs/nilfs2/btnode.c
@@ -68,6 +68,32 @@ void nilfs_btnode_cache_clear(struct address_space *btnc)
truncate_inode_pages(btnc, 0);
}
+struct buffer_head *
+nilfs_btnode_create_block(struct address_space *btnc, __u64 blocknr)
+{
+ struct inode *inode = NILFS_BTNC_I(btnc);
+ struct buffer_head *bh;
+
+ bh = nilfs_grab_buffer(inode, btnc, blocknr, 1 << BH_NILFS_Node);
+ if (unlikely(!bh))
+ return NULL;
+
+ if (unlikely(buffer_mapped(bh) || buffer_uptodate(bh) ||
+ buffer_dirty(bh))) {
+ brelse(bh);
+ BUG();
+ }
+ memset(bh->b_data, 0, 1 << inode->i_blkbits);
+ bh->b_bdev = NILFS_I_NILFS(inode)->ns_bdev;
+ bh->b_blocknr = blocknr;
+ set_buffer_mapped(bh);
+ set_buffer_uptodate(bh);
+
+ unlock_page(bh->b_page);
+ page_cache_release(bh->b_page);
+ return bh;
+}
+
int nilfs_btnode_submit_block(struct address_space *btnc, __u64 blocknr,
sector_t pblocknr, struct buffer_head **pbh,
int newblk)
diff --git a/fs/nilfs2/btnode.h b/fs/nilfs2/btnode.h
index 3e2275172ed..c53644c0cf0 100644
--- a/fs/nilfs2/btnode.h
+++ b/fs/nilfs2/btnode.h
@@ -40,6 +40,8 @@ struct nilfs_btnode_chkey_ctxt {
void nilfs_btnode_cache_init_once(struct address_space *);
void nilfs_btnode_cache_init(struct address_space *, struct backing_dev_info *);
void nilfs_btnode_cache_clear(struct address_space *);
+struct buffer_head *nilfs_btnode_create_block(struct address_space *btnc,
+ __u64 blocknr);
int nilfs_btnode_submit_block(struct address_space *, __u64, sector_t,
struct buffer_head **, int);
int nilfs_btnode_get(struct address_space *, __u64, sector_t,
--
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