From: Jeff Layton <jlayton@redhat.com>
Date: Tue, 11 Dec 2012 17:10:05 +0000 (-0500)
Subject: vfs: make fstatat retry on ESTALE errors from getattr call
X-Git-Tag: v3.8-rc1~13^2~26
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=836fb7e7b978e5f3b8b52e40838ddc50264723f0;p=profile%2Fcommon%2Fkernel-common.git

vfs: make fstatat retry on ESTALE errors from getattr call

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

diff --git a/fs/stat.c b/fs/stat.c
index eae4946..d221995 100644
--- a/fs/stat.c
+++ b/fs/stat.c
@@ -74,7 +74,7 @@ int vfs_fstatat(int dfd, const char __user *filename, struct kstat *stat,
 {
 	struct path path;
 	int error = -EINVAL;
-	int lookup_flags = 0;
+	unsigned int lookup_flags = 0;
 
 	if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT |
 		      AT_EMPTY_PATH)) != 0)
@@ -84,13 +84,17 @@ int vfs_fstatat(int dfd, const char __user *filename, struct kstat *stat,
 		lookup_flags |= LOOKUP_FOLLOW;
 	if (flag & AT_EMPTY_PATH)
 		lookup_flags |= LOOKUP_EMPTY;
-
+retry:
 	error = user_path_at(dfd, filename, lookup_flags, &path);
 	if (error)
 		goto out;
 
 	error = vfs_getattr(path.mnt, path.dentry, stat);
 	path_put(&path);
+	if (retry_estale(error, lookup_flags)) {
+		lookup_flags |= LOOKUP_REVAL;
+		goto retry;
+	}
 out:
 	return error;
 }