Don't pass inode to ->d_hash() and ->d_compare()

Instances either don't look at it at all (the majority of cases) or
only want it to find the superblock (which can be had as dentry->d_sb).
A few cases that want more are actually safe with dentry->d_inode -
the only precaution needed is the check that it hadn't been replaced with
NULL by rmdir() or by overwriting rename(), which case should be simply
treated as cache miss.

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

1 files changed, 3 insertions, 4 deletions

diff --git a/fs/namei.c b/fs/namei.c
index 66998b06d822..b2beee7a733f 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1352,7 +1352,7 @@ static int lookup_fast(struct nameidata *nd,
          */
         if (nd->flags & LOOKUP_RCU) {
                 unsigned seq;
-                dentry = __d_lookup_rcu(parent, &nd->last, &seq, nd->inode);
+                dentry = __d_lookup_rcu(parent, &nd->last, &seq);
                 if (!dentry)
                         goto unlazy;
 
@@ -1787,8 +1787,7 @@ static int link_path_walk(const char *name, struct nameidata *nd)
                         struct dentry *parent = nd->path.dentry;
                         nd->flags &= ~LOOKUP_JUMPED;
                         if (unlikely(parent->d_flags & DCACHE_OP_HASH)) {
-                                err = parent->d_op->d_hash(parent, nd->inode,
-                                                           &this);
+                                err = parent->d_op->d_hash(parent, &this);
                                 if (err < 0)
                                         break;
                         }
@@ -2121,7 +2120,7 @@ struct dentry *lookup_one_len(const char *name, struct dentry *base, int len)
          * to use its own hash..
          */
         if (base->d_flags & DCACHE_OP_HASH) {
-                int err = base->d_op->d_hash(base, base->d_inode, &this);
+                int err = base->d_op->d_hash(base, &this);
                 if (err < 0)
                         return ERR_PTR(err);
         }