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| author | Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> | 2009-10-10 22:58:10 +0900 |
|---|---|---|
| committer | Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp> | 2009-11-20 10:05:46 +0900 |
| commit | 9b945d537db86557e5b5820b4b52df94c35b3829 (patch) | |
| tree | 84f041ec97f26d79709e93623f75371f6449d7ef /fs | |
| parent | 648f4e3e50c4793d9dbf9a09afa193631f76fa26 (diff) | |
| download | linux-9b945d537db86557e5b5820b4b52df94c35b3829.tar.bz2 | |
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 <konishi.ryusuke@lab.ntt.co.jp>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/nilfs2/btree.c | 18 |
1 files 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; |