cifs: always update the inode cache with the results from a FIND_*

When we get back a FIND_FIRST/NEXT result, we have some info about the
dentry that we use to instantiate a new inode. We were ignoring and
discarding that info when we had an existing dentry in the cache.

Fix this by updating the inode in place when we find an existing dentry
and the uniqueid is the same.

Cc: <stable@vger.kernel.org> # .31.x
Reported-and-Tested-by: Andrew Bartlett <abartlet@samba.org>
Reported-by: Bill Robertson <bill_robertson@debortoli.com.au>
Reported-by: Dion Edwards <dion_edwards@debortoli.com.au>
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Steve French <smfrench@gmail.com>

diff --git a/fs/cifs/readdir.c b/fs/cifs/readdir.c
index 0a8224d1c4c5f2df8545f2c84f9e668feba2e0e9..a4217f02fab2860ced9f1bf444662cbf05461a4e 100644 (file)
--- a/fs/cifs/readdir.c
+++ b/fs/cifs/readdir.c
@@ -86,9 +86,12 @@ cifs_readdir_lookup(struct dentry *parent, struct qstr *name,
 
        dentry = d_lookup(parent, name);
        if (dentry) {
-               /* FIXME: check for inode number changes? */
-               if (dentry->d_inode != NULL)
+               inode = dentry->d_inode;
+               /* update inode in place if i_ino didn't change */
+               if (inode && CIFS_I(inode)->uniqueid == fattr->cf_uniqueid) {
+                       cifs_fattr_to_inode(inode, fattr);
                        return dentry;
+               }
                d_drop(dentry);
                dput(dentry);
        }