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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
commitd40990537c9ea85dfe75dbe0ffba5e1002dfdf3f (patch)
tree3db27e3e911428502942c95b9f8f52e2a041bd54
parentfe744fdb74f2417d8571faefa45f72b0ead25f89 (diff)
nilfs2: fix missing block address termination in btree node shrinking
nilfs_btree_delete function does not terminate part of virtual block addresses when shrinking the last remaining child node into the root node. The missing address termination causes that dead btree node blocks persist and chip away free disk space. This fixes the leak bug on the btree node deletion. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
-rw-r--r--fs/nilfs2/btree.c21
1 files changed, 14 insertions, 7 deletions
diff --git a/fs/nilfs2/btree.c b/fs/nilfs2/btree.c
index fd4f05b9194..b2e3ff34762 100644
--- a/fs/nilfs2/btree.c
+++ b/fs/nilfs2/btree.c
@@ -1346,6 +1346,11 @@ static void nilfs_btree_shrink(struct nilfs_bmap *btree,
path[level].bp_bh = NULL;
}
+static void nilfs_btree_nop(struct nilfs_bmap *btree,
+ struct nilfs_btree_path *path,
+ int level, __u64 *keyp, __u64 *ptrp)
+{
+}
static int nilfs_btree_prepare_delete(struct nilfs_bmap *btree,
struct nilfs_btree_path *path,
@@ -1439,16 +1444,22 @@ static int nilfs_btree_prepare_delete(struct nilfs_bmap *btree,
NILFS_BTREE_ROOT_NCHILDREN_MAX) {
path[level].bp_op = nilfs_btree_shrink;
stats->bs_nblocks += 2;
+ level++;
+ path[level].bp_op = nilfs_btree_nop;
+ goto shrink_root_child;
} else {
path[level].bp_op = nilfs_btree_do_delete;
stats->bs_nblocks++;
+ goto out;
}
-
- goto out;
-
}
}
+ /* child of the root node is deleted */
+ path[level].bp_op = nilfs_btree_do_delete;
+ stats->bs_nblocks++;
+
+shrink_root_child:
node = nilfs_btree_get_root(btree);
path[level].bp_oldreq.bpr_ptr =
nilfs_btree_node_get_ptr(node, dindex,
@@ -1458,10 +1469,6 @@ static int nilfs_btree_prepare_delete(struct nilfs_bmap *btree,
if (ret < 0)
goto err_out_child_node;
- /* child of the root node is deleted */
- path[level].bp_op = nilfs_btree_do_delete;
- stats->bs_nblocks++;
-
/* success */
out:
*levelp = level;