fs/9p: Make sure we properly instantiate dentry.

For lookup if we get ENOENT error from the server we still
instantiate the dentry. We need to make sure we have dentry
operations set in that case so that a later dput on the dentry
does the expected. Without the patch we get the below error

#ln  -sf abc abclink
ln: creating symbolic link `abclink': No such file or directory

Now on the host do
$ touch abclink

Guest now gives ENOENT error.
# ls
ls: cannot access abclink: No such file or directory

Debugged-by:Gautham R Shenoy <ego@in.ibm.com>
Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: Eric Van Hensbergen <ericvh@gmail.com>

diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index de9a39590b70eb29b02af909942b8cae2cfd1fc8..b44c99979143f30f501b85f99ec39ddfd59ea4f8 100644 (file)
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -697,8 +697,8 @@ static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
        if (IS_ERR(fid)) {
                result = PTR_ERR(fid);
                if (result == -ENOENT) {
-                       d_add(dentry, NULL);
-                       return NULL;
+                       inode = NULL;
+                       goto inst_out;
                }
 
                return ERR_PTR(result);
@@ -715,7 +715,8 @@ static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
        if (result < 0)
                goto error;
 
-       if ((fid->qid.version) && (v9ses->cache))
+inst_out:
+       if (v9ses->cache)
                dentry->d_op = &v9fs_cached_dentry_operations;
        else
                dentry->d_op = &v9fs_dentry_operations;