VFS: Handle lower layer dentry/inode in pathwalk

Make use of d_backing_inode() in pathwalk to gain access to an
inode or dentry that's on a lower layer.

Signed-off-by: David Howells <dhowells@redhat.com>

2 files changed, 6 insertions, 6 deletions

diff --git a/fs/namei.c b/fs/namei.c
index 366b0f348d1c..bcacb3100317 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1423,7 +1423,7 @@ static int lookup_fast(struct nameidata *nd,
                  * This sequence count validates that the inode matches
                  * the dentry name information from lookup.
                  */
-                *inode = dentry->d_inode;
+                *inode = d_backing_inode(dentry);
                 negative = d_is_negative(dentry);
                 if (read_seqcount_retry(&dentry->d_seq, seq))
                         return -ECHILD;
@@ -1483,7 +1483,7 @@ unlazy:
         path->dentry = dentry;
         err = follow_managed(path, nd);
         if (likely(!err))
-                *inode = path->dentry->d_inode;
+                *inode = d_backing_inode(path->dentry);
         return err;
 
 need_lookup:
@@ -1618,7 +1618,7 @@ static int walk_component(struct nameidata *nd, int flags)
                 if (err < 0)
                         return err;
 
-                inode = path.dentry->d_inode;
+                inode = d_backing_inode(path.dentry);
                 seq = 0;        /* we are already out of RCU mode */
                 err = -ENOENT;
                 if (d_is_negative(path.dentry))
@@ -2471,7 +2471,7 @@ EXPORT_SYMBOL(__check_sticky);
  */
 static int may_delete(struct inode *dir, struct dentry *victim, bool isdir)
 {
-        struct inode *inode = victim->d_inode;
+        struct inode *inode = d_backing_inode(victim);
         int error;
 
         if (d_is_negative(victim))
@@ -3054,7 +3054,7 @@ retry_lookup:
                 return error;
 
         BUG_ON(nd->flags & LOOKUP_RCU);
-        inode = path.dentry->d_inode;
+        inode = d_backing_inode(path.dentry);
         seq = 0;        /* out of RCU mode, so the value doesn't matter */
         if (unlikely(d_is_negative(path.dentry))) {
                 path_to_nameidata(&path, nd);
diff --git a/fs/open.c b/fs/open.c
index 98e5a52dc68c..e0250bdcc440 100644
--- a/fs/open.c
+++ b/fs/open.c
@@ -367,7 +367,7 @@ retry:
         if (res)
                 goto out;
 
-        inode = path.dentry->d_inode;
+        inode = d_backing_inode(path.dentry);
 
         if ((mode & MAY_EXEC) && S_ISREG(inode->i_mode)) {
                 /*