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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>
This commit is contained in:
Ryusuke Konishi 2010-07-18 10:42:25 +09:00
parent 464ece8863
commit 4e13e66bee
3 changed files with 15 additions and 2 deletions
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10
fs/nilfs2/btree.c
View File

@ -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 *

5
fs/nilfs2/page.c
View File

@ -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);

2
fs/nilfs2/page.h
View File

@ -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);