Commit 4e13e66b authored by Ryusuke Konishi's avatar Ryusuke Konishi
Browse files

nilfs2: introduce check flag to btree node buffer 



nilfs_btree_get_block() now may return untested buffer due to
read-ahead.  This adds a new flag for buffer heads so that the btree
code can check whether the buffer is already verified or not.

Signed-off-by: default avatarRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
parent 464ece88

fs/nilfs2/btree.c

+9 −1
Original line number Diff line number Diff line
@@ -370,8 +370,16 @@ static int nilfs_btree_node_broken(const struct nilfs_btree_node *node, 


int nilfs_btree_broken_node_block(struct buffer_head *bh)

{

	return nilfs_btree_node_broken((struct nilfs_btree_node *)bh->b_data,

	int ret;



	if (buffer_nilfs_checked(bh))

		return 0;



	ret = nilfs_btree_node_broken((struct nilfs_btree_node *)bh->b_data,

				       bh->b_size, bh->b_blocknr);

	if (likely(!ret))

		set_buffer_nilfs_checked(bh);

	return ret;

}



static struct nilfs_btree_node *

fs/nilfs2/page.c

+4 −1
Original line number Diff line number Diff line
@@ -37,7 +37,8 @@ 


#define NILFS_BUFFER_INHERENT_BITS  \

	((1UL << BH_Uptodate) | (1UL << BH_Mapped) | (1UL << BH_NILFS_Node) | \

	 (1UL << BH_NILFS_Volatile) | (1UL << BH_NILFS_Allocated))

	 (1UL << BH_NILFS_Volatile) | (1UL << BH_NILFS_Allocated) | \

	 (1UL << BH_NILFS_Checked))



static struct buffer_head *

__nilfs_get_page_block(struct page *page, unsigned long block, pgoff_t index,
@@ -129,6 +130,7 @@ void nilfs_forget_buffer(struct buffer_head *bh) 


	lock_buffer(bh);

	clear_buffer_nilfs_volatile(bh);

	clear_buffer_nilfs_checked(bh);

	clear_buffer_dirty(bh);

	if (nilfs_page_buffers_clean(page))

		__nilfs_clear_page_dirty(page);
@@ -480,6 +482,7 @@ void nilfs_clear_dirty_pages(struct address_space *mapping) 
				lock_buffer(bh);

				clear_buffer_dirty(bh);

				clear_buffer_nilfs_volatile(bh);

				clear_buffer_nilfs_checked(bh);

				clear_buffer_uptodate(bh);

				clear_buffer_mapped(bh);

				unlock_buffer(bh);

fs/nilfs2/page.h

+2 −0
Original line number Diff line number Diff line
@@ -34,11 +34,13 @@ enum { 
	BH_NILFS_Allocated = BH_PrivateStart,

	BH_NILFS_Node,

	BH_NILFS_Volatile,

	BH_NILFS_Checked,

};



BUFFER_FNS(NILFS_Allocated, nilfs_allocated)	/* nilfs private buffers */

BUFFER_FNS(NILFS_Node, nilfs_node)		/* nilfs node buffers */

BUFFER_FNS(NILFS_Volatile, nilfs_volatile)

BUFFER_FNS(NILFS_Checked, nilfs_checked)	/* buffer is verified */





void nilfs_mark_buffer_dirty(struct buffer_head *bh);