Commit d501d736 authored by Ryusuke Konishi's avatar Ryusuke Konishi
Browse files

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: default avatarRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
parent b34a6506

fs/nilfs2/btnode.c

+26 −0
Original line number Diff line number Diff line
@@ -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)

fs/nilfs2/btnode.h

+2 −0
Original line number Diff line number Diff line
@@ -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,