From 9b945d537db86557e5b5820b4b52df94c35b3829 Mon Sep 17 00:00:00 2001 From: Ryusuke Konishi Date: Sat, 10 Oct 2009 22:58:10 +0900 Subject: [PATCH] nilfs2: get rid of BUG_ON use in btree lookup routines The current btree lookup routines make a kernel oops when detected inconsistency in btree blocks. These routines should instead return a proper error code because the inconsistency usually comes from corruption of on-disk metadata. This fixes the issue by converting BUG_ON calls to proper error handlings. Signed-off-by: Ryusuke Konishi --- fs/nilfs2/btree.c | 18 ++++++++++++++++-- 1 file changed, 16 insertions(+), 2 deletions(-) diff --git a/fs/nilfs2/btree.c b/fs/nilfs2/btree.c index e25b507a474f..420c9ecbca15 100644 --- a/fs/nilfs2/btree.c +++ b/fs/nilfs2/btree.c @@ -444,6 +444,18 @@ nilfs_btree_get_node(const struct nilfs_btree *btree, nilfs_btree_get_nonroot_node(path, level); } +static inline int +nilfs_btree_bad_node(struct nilfs_btree_node *node, int level) +{ + if (unlikely(nilfs_btree_node_get_level(node) != level)) { + dump_stack(); + printk(KERN_CRIT "NILFS: btree level mismatch: %d != %d\n", + nilfs_btree_node_get_level(node), level); + return 1; + } + return 0; +} + static int nilfs_btree_do_lookup(const struct nilfs_btree *btree, struct nilfs_btree_path *path, __u64 key, __u64 *ptrp, int minlevel) @@ -467,7 +479,8 @@ static int nilfs_btree_do_lookup(const struct nilfs_btree *btree, if (ret < 0) return ret; node = nilfs_btree_get_nonroot_node(path, level); - BUG_ON(level != nilfs_btree_node_get_level(node)); + if (nilfs_btree_bad_node(node, level)) + return -EINVAL; if (!found) found = nilfs_btree_node_lookup(node, key, &index); else @@ -512,7 +525,8 @@ static int nilfs_btree_do_lookup_last(const struct nilfs_btree *btree, if (ret < 0) return ret; node = nilfs_btree_get_nonroot_node(path, level); - BUG_ON(level != nilfs_btree_node_get_level(node)); + if (nilfs_btree_bad_node(node, level)) + return -EINVAL; index = nilfs_btree_node_get_nchildren(node) - 1; ptr = nilfs_btree_node_get_ptr(btree, node, index); path[level].bp_index = index; -- 2.20.1