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| author | Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> | 2010-07-18 03:42:25 +0200 |
|---|---|---|
| committer | Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> | 2010-07-23 03:02:15 +0200 |
| commit | 4e13e66bee2d792c1aae21797f16c181024834eb (patch) | |
| tree | 1fa51dade28bc025d9bda0e09dec1f202281a498 /fs | |
| parent | nilfs2: add btree get block function with readahead option (diff) | |
| download | linux-4e13e66bee2d792c1aae21797f16c181024834eb.tar.xz linux-4e13e66bee2d792c1aae21797f16c181024834eb.zip | |
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>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/nilfs2/btree.c | 10 | ||||
| -rw-r--r-- | fs/nilfs2/page.c | 5 | ||||
| -rw-r--r-- | fs/nilfs2/page.h | 2 |
3 files changed, 15 insertions, 2 deletions
diff --git a/fs/nilfs2/btree.c b/fs/nilfs2/btree.c index 1b5321c0bcac..d3faa0bba171 100644 --- a/fs/nilfs2/btree.c +++ b/fs/nilfs2/btree.c @@ -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 * diff --git a/fs/nilfs2/page.c b/fs/nilfs2/page.c index 8de3e1e48130..aab11db2cb08 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 @@ 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); diff --git a/fs/nilfs2/page.h b/fs/nilfs2/page.h index 8abca4d1c1f8..f53d8da41ed7 100644 --- a/fs/nilfs2/page.h +++ b/fs/nilfs2/page.h @@ -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); |