linux-kernel - [PATCH v9 24/34] vfs: make lgetxattr retry once on ESTALE

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Message-Id: <1352128933-28526-25-git-send-email-jlayton@redhat.com>
Date:	Mon,  5 Nov 2012 10:22:03 -0500
From:	Jeff Layton <jlayton@...hat.com>
To:	viro@...iv.linux.org.uk
Cc:	linux-fsdevel@...r.kernel.org, linux-nfs@...r.kernel.org,
	linux-kernel@...r.kernel.org, michael.brantley@...haw.com,
	hch@...radead.org, miklos@...redi.hu, pstaubach@...grid.com
Subject: [PATCH v9 24/34] vfs: make lgetxattr retry once on ESTALE

Signed-off-by: Jeff Layton <jlayton@...hat.com>
---
 fs/xattr.c | 15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

diff --git a/fs/xattr.c b/fs/xattr.c
index 42284fc..3a5e3ff 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -505,12 +505,17 @@ SYSCALL_DEFINE4(lgetxattr, const char __user *, pathname,
 {
 	struct path path;
 	ssize_t error;
+	unsigned int try = 0;
+	unsigned int lookup_flags = 0;
 
-	error = user_lpath(pathname, &path);
-	if (error)
-		return error;
-	error = getxattr(path.dentry, name, value, size);
-	path_put(&path);
+	do {
+		error = user_path_at(AT_FDCWD, pathname, lookup_flags, &path);
+		if (error)
+			break;
+		error = getxattr(path.dentry, name, value, size);
+		path_put(&path);
+		lookup_flags |= LOOKUP_REVAL;
+	} while (retry_estale(error, try++));
 	return error;
 }
 
-- 
1.7.11.7

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