From: Jeff Layton <jlayton@redhat.com>
Date: Thu, 20 Dec 2012 21:04:09 +0000 (-0500)
Subject: vfs: fix mkdirat to retry once on an ESTALE error
X-Git-Tag: upstream/snapshot3+hdmi~5970^2~22
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=b76d8b82266077dc7098dd13f321a616099a1bd8;p=platform%2Fadaptation%2Frenesas_rcar%2Frenesas_kernel.git

vfs: fix mkdirat to retry once on an ESTALE error

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 b70c191..1beebc1 100644
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -3243,8 +3243,10 @@ SYSCALL_DEFINE3(mkdirat, int, dfd, const char __user *, pathname, umode_t, mode)
 	struct dentry *dentry;
 	struct path path;
 	int error;
+	unsigned int lookup_flags = LOOKUP_DIRECTORY;
 
-	dentry = user_path_create(dfd, pathname, &path, LOOKUP_DIRECTORY);
+retry:
+	dentry = user_path_create(dfd, pathname, &path, lookup_flags);
 	if (IS_ERR(dentry))
 		return PTR_ERR(dentry);
 
@@ -3254,6 +3256,10 @@ SYSCALL_DEFINE3(mkdirat, int, dfd, const char __user *, pathname, umode_t, mode)
 	if (!error)
 		error = vfs_mkdir(path.dentry->d_inode, dentry, mode);
 	done_path_create(&path, dentry);
+	if (retry_estale(error, lookup_flags)) {
+		lookup_flags |= LOOKUP_REVAL;
+		goto retry;
+	}
 	return error;
 }