linux-kernel - [PATCH v9 21/34] vfs: allow setxattr to retry once on ESTALE errors

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Date:	Mon,  5 Nov 2012 10:22:00 -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 21/34] vfs: allow setxattr to retry once on ESTALE errors

Signed-off-by: Jeff Layton <jlayton@...hat.com>
---
 fs/xattr.c | 23 ++++++++++++++---------
 1 file changed, 14 insertions(+), 9 deletions(-)

diff --git a/fs/xattr.c b/fs/xattr.c
index f3a2ffa..5b6e48d 100644
--- a/fs/xattr.c
+++ b/fs/xattr.c
@@ -370,16 +370,21 @@ SYSCALL_DEFINE5(setxattr, const char __user *, pathname,
 {
 	struct path path;
 	int error;
+	unsigned int try = 0;
+	unsigned int lookup_flags = LOOKUP_FOLLOW;
 
-	error = user_path(pathname, &path);
-	if (error)
-		return error;
-	error = mnt_want_write(path.mnt);
-	if (!error) {
-		error = setxattr(path.dentry, name, value, size, flags);
-		mnt_drop_write(path.mnt);
-	}
-	path_put(&path);
+	do {
+		error = user_path_at(AT_FDCWD, pathname, lookup_flags, &path);
+		if (error)
+			break;
+		error = mnt_want_write(path.mnt);
+		if (!error) {
+			error = setxattr(path.dentry, name, value, size, flags);
+			mnt_drop_write(path.mnt);
+		}
+		path_put(&path);
+		lookup_flags |= LOOKUP_REVAL;
+	} while (retry_estale(error, try++));
 	return error;
 }
 
-- 
1.7.11.7

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