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| author | Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> | 2009-11-13 08:04:11 +0100 |
|---|---|---|
| committer | Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> | 2009-11-20 02:05:49 +0100 |
| commit | d501d7368937740e8d06671a4bfe4e236ed25bd0 (patch) | |
| tree | c0abbdc89862cfdb5e85321cbc6f2959af376cd9 /fs/nilfs2/btnode.c | |
| parent | nilfs2: avoid readahead on metadata file for create mode (diff) | |
| download | linux-d501d7368937740e8d06671a4bfe4e236ed25bd0.tar.xz linux-d501d7368937740e8d06671a4bfe4e236ed25bd0.zip | |
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>
Diffstat (limited to 'fs/nilfs2/btnode.c')
| -rw-r--r-- | fs/nilfs2/btnode.c | 26 |
1 files changed, 26 insertions, 0 deletions
diff --git a/fs/nilfs2/btnode.c b/fs/nilfs2/btnode.c index 84c25382f8e3..fc3e4bdb62ae 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) |