From: Jeff Layton <jlayton@redhat.com>
Date: Tue, 11 Dec 2012 17:10:08 +0000 (-0500)
Subject: vfs: fix symlinkat to retry on ESTALE errors
X-Git-Tag: upstream/snapshot3+hdmi~5970^2~21
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=f46d3567b223e41e1f2faeb82d3b74a6d84fc508;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git

vfs: fix symlinkat to retry on ESTALE errors

Signed-off-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
---

diff --git a/fs/namei.c b/fs/namei.c
index 1beebc1..b06a111 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -3521,12 +3521,13 @@ SYSCALL_DEFINE3(symlinkat, const char __user *, oldname,
 	struct filename *from;
 	struct dentry *dentry;
 	struct path path;
+	unsigned int lookup_flags = 0;
 
 	from = getname(oldname);
 	if (IS_ERR(from))
 		return PTR_ERR(from);
-
-	dentry = user_path_create(newdfd, newname, &path, 0);
+retry:
+	dentry = user_path_create(newdfd, newname, &path, lookup_flags);
 	error = PTR_ERR(dentry);
 	if (IS_ERR(dentry))
 		goto out_putname;
@@ -3535,6 +3536,10 @@ SYSCALL_DEFINE3(symlinkat, const char __user *, oldname,
 	if (!error)
 		error = vfs_symlink(path.dentry->d_inode, dentry, from->name);
 	done_path_create(&path, dentry);
+	if (retry_estale(error, lookup_flags)) {
+		lookup_flags |= LOOKUP_REVAL;
+		goto retry;
+	}
 out_putname:
 	putname(from);
 	return error;