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authorRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2011-05-25 23:00:27 +0900
committerRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2011-06-11 15:51:15 +0900
commitfe744fdb74f2417d8571faefa45f72b0ead25f89 (patch)
tree516655aad7800018483724cce93c24c2418fc1f4
parent59c5f46fbe01a00eedf54a23789634438bb80603 (diff)
nilfs2: fix incorrect block address termination in node concatenation
nilfs_btree_delete function wrongly terminates virtual block address of the btree node held by its parent at index 0. When concatenating the index-0 node with its right sibling node, nilfs_btree_delete terminates the block address of index-0 node instead of the right sibling node which should be deleted. This bug not only wears disk space in the long run, but also causes file system corruption. This will fix it. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
-rw-r--r--fs/nilfs2/btree.c18
1 files changed, 13 insertions, 5 deletions
diff --git a/fs/nilfs2/btree.c b/fs/nilfs2/btree.c
index 7eafe468a29c..fd4f05b91942 100644
--- a/fs/nilfs2/btree.c
+++ b/fs/nilfs2/btree.c
@@ -1356,20 +1356,19 @@ static int nilfs_btree_prepare_delete(struct nilfs_bmap *btree,
struct buffer_head *bh;
struct nilfs_btree_node *node, *parent, *sib;
__u64 sibptr;
- int pindex, level, ncmin, ncmax, ncblk, ret;
+ int pindex, dindex, level, ncmin, ncmax, ncblk, ret;
ret = 0;
stats->bs_nblocks = 0;
ncmin = NILFS_BTREE_NODE_NCHILDREN_MIN(nilfs_btree_node_size(btree));
ncblk = nilfs_btree_nchildren_per_block(btree);
- for (level = NILFS_BTREE_LEVEL_NODE_MIN;
+ for (level = NILFS_BTREE_LEVEL_NODE_MIN, dindex = path[level].bp_index;
level < nilfs_btree_height(btree) - 1;
level++) {
node = nilfs_btree_get_nonroot_node(path, level);
path[level].bp_oldreq.bpr_ptr =
- nilfs_btree_node_get_ptr(node, path[level].bp_index,
- ncblk);
+ nilfs_btree_node_get_ptr(node, dindex, ncblk);
ret = nilfs_bmap_prepare_end_ptr(btree,
&path[level].bp_oldreq, dat);
if (ret < 0)
@@ -1383,6 +1382,7 @@ static int nilfs_btree_prepare_delete(struct nilfs_bmap *btree,
parent = nilfs_btree_get_node(btree, path, level + 1, &ncmax);
pindex = path[level + 1].bp_index;
+ dindex = pindex;
if (pindex > 0) {
/* left sibling */
@@ -1421,6 +1421,14 @@ static int nilfs_btree_prepare_delete(struct nilfs_bmap *btree,
path[level].bp_sib_bh = bh;
path[level].bp_op = nilfs_btree_concat_right;
stats->bs_nblocks++;
+ /*
+ * When merging right sibling node
+ * into the current node, pointer to
+ * the right sibling node must be
+ * terminated instead. The adjustment
+ * below is required for that.
+ */
+ dindex = pindex + 1;
/* continue; */
}
} else {
@@ -1443,7 +1451,7 @@ static int nilfs_btree_prepare_delete(struct nilfs_bmap *btree,
node = nilfs_btree_get_root(btree);
path[level].bp_oldreq.bpr_ptr =
- nilfs_btree_node_get_ptr(node, path[level].bp_index,
+ nilfs_btree_node_get_ptr(node, dindex,
NILFS_BTREE_ROOT_NCHILDREN_MAX);
ret = nilfs_bmap_prepare_end_ptr(btree, &path[level].bp_oldreq, dat);