exportfs: BUG_ON in crazy corner case
This would indicate a nasty bug in the dcache and has never triggered in
the past 10 years as far as I know.
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/exportfs/expfs.c b/fs/exportfs/expfs.c
index c43fe9b..6d0a7fa 100644
--- a/fs/exportfs/expfs.c
+++ b/fs/exportfs/expfs.c
@@ -112,18 +112,14 @@
while (target_dir->d_flags & DCACHE_DISCONNECTED && noprogress++ < 10) {
struct dentry *pd = find_disconnected_root(target_dir);
+ BUG_ON(pd == mnt->mnt_sb->s_root);
+
if (!IS_ROOT(pd)) {
/* must have found a connected parent - great */
spin_lock(&pd->d_lock);
pd->d_flags &= ~DCACHE_DISCONNECTED;
spin_unlock(&pd->d_lock);
noprogress = 0;
- } else if (pd == mnt->mnt_sb->s_root) {
- printk(KERN_ERR "export: Eeek filesystem root is not connected, impossible\n");
- spin_lock(&pd->d_lock);
- pd->d_flags &= ~DCACHE_DISCONNECTED;
- spin_unlock(&pd->d_lock);
- noprogress = 0;
} else {
/*
* We have hit the top of a disconnected path, try to