From: Al Viro <viro@zeniv.linux.org.uk>
Date: Mon, 14 May 2018 21:42:29 -0400
Subject: [PATCH] cifs_lookup(): switch to d_splice_alias()
Git-commit: 11f17c9bd77baf341351d09b6881cd6ff92b5dd4
Patch-mainline: v4.17-rc7
References: bsc#1144333

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Acked-by: Aurelien Aptel <aaptel@suse.com>
---
 fs/cifs/dir.c | 36 ++++++++++++++++++------------------
 1 file changed, 18 insertions(+), 18 deletions(-)

diff --git a/fs/cifs/dir.c b/fs/cifs/dir.c
index ecbf36c459ea..751b8c9998ca 100644
--- a/fs/cifs/dir.c
+++ b/fs/cifs/dir.c
@@ -779,21 +779,25 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
 	tlink = cifs_sb_tlink(cifs_sb);
 	if (IS_ERR(tlink)) {
 		free_xid(xid);
-		return (struct dentry *)tlink;
+		return ERR_CAST(tlink);
 	}
 	pTcon = tlink_tcon(tlink);
 
 	rc = check_name(direntry, pTcon);
-	if (rc)
-		goto lookup_out;
+	if (unlikely(rc)) {
+		cifs_put_tlink(tlink);
+		free_xid(xid);
+		return ERR_PTR(rc);
+	}
 
 	/* can not grab the rename sem here since it would
 	deadlock in the cases (beginning of sys_rename itself)
 	in which we already have the sb rename sem */
 	full_path = build_path_from_dentry(direntry);
 	if (full_path == NULL) {
-		rc = -ENOMEM;
-		goto lookup_out;
+		cifs_put_tlink(tlink);
+		free_xid(xid);
+		return ERR_PTR(-ENOMEM);
 	}
 
 	if (d_really_is_positive(direntry)) {
@@ -813,28 +817,24 @@ cifs_lookup(struct inode *parent_dir_inode, struct dentry *direntry,
 	}
 
 	if (rc == 0) {
-		d_add(direntry, newInode);
 		/* since paths are not looked up by component - the parent
 		   directories are presumed to be good here */
 		renew_parental_timestamps(direntry);
-
 	} else if (rc == -ENOENT) {
-		rc = 0;
 		cifs_set_time(direntry, jiffies);
-		d_add(direntry, NULL);
-	/*	if it was once a directory (but how can we tell?) we could do
-		shrink_dcache_parent(direntry); */
-	} else if (rc != -EACCES) {
-		cifs_dbg(FYI, "Unexpected lookup error %d\n", rc);
-		/* We special case check for Access Denied - since that
-		is a common return code */
+		newInode = NULL;
+	} else {
+		if (rc != -EACCES) {
+			cifs_dbg(FYI, "Unexpected lookup error %d\n", rc);
+			/* We special case check for Access Denied - since that
+			is a common return code */
+		}
+		newInode = ERR_PTR(rc);
 	}
-
-lookup_out:
 	kfree(full_path);
 	cifs_put_tlink(tlink);
 	free_xid(xid);
-	return ERR_PTR(rc);
+	return d_splice_alias(newInode, direntry);
 }
 
 static int
-- 
2.16.4