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: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
diff --git a/fs/nilfs2/page.c b/fs/nilfs2/page.c
index 8de3e1e..aab11db 100644
--- a/fs/nilfs2/page.c
+++ b/fs/nilfs2/page.c
@@ -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 @@
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 @@
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);