fix race in d_splice_alias()

rehashing the negative placeholder opens a race with d_lookup();
we unhash it almost immediately (by d_move()), but the race
window is there.  Since d_move() doesn't rely on target being
hashed, we don't need that d_rehash() at all.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 0 insertions, 1 deletions

diff --git a/fs/dcache.c b/fs/dcache.c
index 74da947b160b..f1358e5c3a59 100644
--- a/fs/dcache.c
+++ b/fs/dcache.c
@@ -1222,7 +1222,6 @@ struct dentry *d_splice_alias(struct inode *inode, struct dentry *dentry)
                         BUG_ON(!(new->d_flags & DCACHE_DISCONNECTED));
                         spin_unlock(&dcache_lock);
                         security_d_instantiate(new, inode);
-                        d_rehash(dentry);
                         d_move(new, dentry);
                         iput(inode);
                 } else {